Squashed 'third_party/glog/' content from commit 9ef754a3023

git-subtree-dir: third_party/glog
git-subtree-split: 9ef754a3023e6fd10f20fe53dfca96dd898182e3

57 files changed, 18285 insertions, 0 deletions

diff --git a/src/base/commandlineflags.h b/src/base/commandlineflags.h
new file mode 100644
index 000000000000..c8d50890269a
--- /dev/null
+++ b/src/base/commandlineflags.h
@@ -0,0 +1,133 @@
+// Copyright (c) 2008, Google Inc.
+// All rights reserved.
+// 
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+// 
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+// 
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// ---
+// This file is a compatibility layer that defines Google's version of
+// command line flags that are used for configuration.
+//
+// We put flags into their own namespace.  It is purposefully
+// named in an opaque way that people should have trouble typing
+// directly.  The idea is that DEFINE puts the flag in the weird
+// namespace, and DECLARE imports the flag from there into the
+// current namespace.  The net result is to force people to use
+// DECLARE to get access to a flag, rather than saying
+//   extern bool FLAGS_logtostderr;
+// or some such instead.  We want this so we can put extra
+// functionality (like sanity-checking) in DECLARE if we want,
+// and make sure it is picked up everywhere.
+//
+// We also put the type of the variable in the namespace, so that
+// people can't DECLARE_int32 something that they DEFINE_bool'd
+// elsewhere.
+#ifndef BASE_COMMANDLINEFLAGS_H__
+#define BASE_COMMANDLINEFLAGS_H__
+
+#include "config.h"
+#include <string>
+#include <string.h>               // for memchr
+#include <stdlib.h>               // for getenv
+
+#ifdef HAVE_LIB_GFLAGS
+
+#include <gflags/gflags.h>
+
+#else
+
+#include "glog/logging.h"
+
+#define DECLARE_VARIABLE(type, shorttype, name, tn)                     \
+  namespace fL##shorttype {                                             \
+    extern GOOGLE_GLOG_DLL_DECL type FLAGS_##name;                      \
+  }                                                                     \
+  using fL##shorttype::FLAGS_##name
+#define DEFINE_VARIABLE(type, shorttype, name, value, meaning, tn)      \
+  namespace fL##shorttype {                                             \
+    GOOGLE_GLOG_DLL_DECL type FLAGS_##name(value);                      \
+    char FLAGS_no##name;                                                \
+  }                                                                     \
+  using fL##shorttype::FLAGS_##name
+
+// bool specialization
+#define DECLARE_bool(name) \
+  DECLARE_VARIABLE(bool, B, name, bool)
+#define DEFINE_bool(name, value, meaning) \
+  DEFINE_VARIABLE(bool, B, name, value, meaning, bool)
+
+// int32 specialization
+#define DECLARE_int32(name) \
+  DECLARE_VARIABLE(GOOGLE_NAMESPACE::int32, I, name, int32)
+#define DEFINE_int32(name, value, meaning) \
+  DEFINE_VARIABLE(GOOGLE_NAMESPACE::int32, I, name, value, meaning, int32)
+
+// Special case for string, because we have to specify the namespace
+// std::string, which doesn't play nicely with our FLAG__namespace hackery.
+#define DECLARE_string(name)                                            \
+  namespace fLS {                                                       \
+    extern GOOGLE_GLOG_DLL_DECL std::string& FLAGS_##name;              \
+  }                                                                     \
+  using fLS::FLAGS_##name
+#define DEFINE_string(name, value, meaning)                             \
+  namespace fLS {                                                       \
+    std::string FLAGS_##name##_buf(value);                              \
+    GOOGLE_GLOG_DLL_DECL std::string& FLAGS_##name = FLAGS_##name##_buf; \
+    char FLAGS_no##name;                                                \
+  }                                                                     \
+  using fLS::FLAGS_##name
+
+#endif  // HAVE_LIB_GFLAGS
+
+// Define GLOG_DEFINE_* using DEFINE_* . By using these macros, we
+// have GLOG_* environ variables even if we have gflags installed.
+//
+// If both an environment variable and a flag are specified, the value
+// specified by a flag wins. E.g., if GLOG_v=0 and --v=1, the
+// verbosity will be 1, not 0.
+
+#define GLOG_DEFINE_bool(name, value, meaning) \
+  DEFINE_bool(name, EnvToBool("GLOG_" #name, value), meaning)
+
+#define GLOG_DEFINE_int32(name, value, meaning) \
+  DEFINE_int32(name, EnvToInt("GLOG_" #name, value), meaning)
+
+#define GLOG_DEFINE_string(name, value, meaning) \
+  DEFINE_string(name, EnvToString("GLOG_" #name, value), meaning)
+
+// These macros (could be functions, but I don't want to bother with a .cc
+// file), make it easier to initialize flags from the environment.
+
+#define EnvToString(envname, dflt)   \
+  (!getenv(envname) ? (dflt) : getenv(envname))
+
+#define EnvToBool(envname, dflt)   \
+  (!getenv(envname) ? (dflt) : memchr("tTyY1\0", getenv(envname)[0], 6) != NULL)
+
+#define EnvToInt(envname, dflt)  \
+  (!getenv(envname) ? (dflt) : strtol(getenv(envname), NULL, 10))
+
+#endif  // BASE_COMMANDLINEFLAGS_H__
diff --git a/src/base/googleinit.h b/src/base/googleinit.h
new file mode 100644
index 000000000000..5a8b515cd604
--- /dev/null
+++ b/src/base/googleinit.h
@@ -0,0 +1,51 @@
+// Copyright (c) 2008, Google Inc.
+// All rights reserved.
+// 
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+// 
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+// 
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// ---
+// Author: Jacob Hoffman-Andrews
+
+#ifndef _GOOGLEINIT_H
+#define _GOOGLEINIT_H
+
+class GoogleInitializer {
+ public:
+  typedef void (*void_function)(void);
+  GoogleInitializer(const char*, void_function f) {
+    f();
+  }
+};
+
+#define REGISTER_MODULE_INITIALIZER(name, body)                 \
+  namespace {                                                   \
+    static void google_init_module_##name () { body; }          \
+    GoogleInitializer google_initializer_module_##name(#name,   \
+            google_init_module_##name);                         \
+  }
+
+#endif /* _GOOGLEINIT_H */
diff --git a/src/base/mutex.h b/src/base/mutex.h
new file mode 100644
index 000000000000..ced2b9950edc
--- /dev/null
+++ b/src/base/mutex.h
@@ -0,0 +1,333 @@
+// Copyright (c) 2007, Google Inc.
+// All rights reserved.
+// 
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+// 
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+// 
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+// 
+// ---
+// Author: Craig Silverstein.
+//
+// A simple mutex wrapper, supporting locks and read-write locks.
+// You should assume the locks are *not* re-entrant.
+//
+// To use: you should define the following macros in your configure.ac:
+//   ACX_PTHREAD
+//   AC_RWLOCK
+// The latter is defined in ../autoconf.
+//
+// This class is meant to be internal-only and should be wrapped by an
+// internal namespace.  Before you use this module, please give the
+// name of your internal namespace for this module.  Or, if you want
+// to expose it, you'll want to move it to the Google namespace.  We
+// cannot put this class in global namespace because there can be some
+// problems when we have multiple versions of Mutex in each shared object.
+//
+// NOTE: by default, we have #ifdef'ed out the TryLock() method.
+//       This is for two reasons:
+// 1) TryLock() under Windows is a bit annoying (it requires a
+//    #define to be defined very early).
+// 2) TryLock() is broken for NO_THREADS mode, at least in NDEBUG
+//    mode.
+// If you need TryLock(), and either these two caveats are not a
+// problem for you, or you're willing to work around them, then
+// feel free to #define GMUTEX_TRYLOCK, or to remove the #ifdefs
+// in the code below.
+//
+// CYGWIN NOTE: Cygwin support for rwlock seems to be buggy:
+//    http://www.cygwin.com/ml/cygwin/2008-12/msg00017.html
+// Because of that, we might as well use windows locks for
+// cygwin.  They seem to be more reliable than the cygwin pthreads layer.
+//
+// TRICKY IMPLEMENTATION NOTE:
+// This class is designed to be safe to use during
+// dynamic-initialization -- that is, by global constructors that are
+// run before main() starts.  The issue in this case is that
+// dynamic-initialization happens in an unpredictable order, and it
+// could be that someone else's dynamic initializer could call a
+// function that tries to acquire this mutex -- but that all happens
+// before this mutex's constructor has run.  (This can happen even if
+// the mutex and the function that uses the mutex are in the same .cc
+// file.)  Basically, because Mutex does non-trivial work in its
+// constructor, it's not, in the naive implementation, safe to use
+// before dynamic initialization has run on it.
+//
+// The solution used here is to pair the actual mutex primitive with a
+// bool that is set to true when the mutex is dynamically initialized.
+// (Before that it's false.)  Then we modify all mutex routines to
+// look at the bool, and not try to lock/unlock until the bool makes
+// it to true (which happens after the Mutex constructor has run.)
+//
+// This works because before main() starts -- particularly, during
+// dynamic initialization -- there are no threads, so a) it's ok that
+// the mutex operations are a no-op, since we don't need locking then
+// anyway; and b) we can be quite confident our bool won't change
+// state between a call to Lock() and a call to Unlock() (that would
+// require a global constructor in one translation unit to call Lock()
+// and another global constructor in another translation unit to call
+// Unlock() later, which is pretty perverse).
+//
+// That said, it's tricky, and can conceivably fail; it's safest to
+// avoid trying to acquire a mutex in a global constructor, if you
+// can.  One way it can fail is that a really smart compiler might
+// initialize the bool to true at static-initialization time (too
+// early) rather than at dynamic-initialization time.  To discourage
+// that, we set is_safe_ to true in code (not the constructor
+// colon-initializer) and set it to true via a function that always
+// evaluates to true, but that the compiler can't know always
+// evaluates to true.  This should be good enough.
+
+#ifndef GOOGLE_MUTEX_H_
+#define GOOGLE_MUTEX_H_
+
+#include "config.h"           // to figure out pthreads support
+
+#if defined(NO_THREADS)
+  typedef int MutexType;      // to keep a lock-count
+#elif defined(_WIN32) || defined(__CYGWIN32__) || defined(__CYGWIN64__)
+# ifndef WIN32_LEAN_AND_MEAN
+#  define WIN32_LEAN_AND_MEAN  // We only need minimal includes
+# endif
+# ifdef GMUTEX_TRYLOCK
+  // We need Windows NT or later for TryEnterCriticalSection().  If you
+  // don't need that functionality, you can remove these _WIN32_WINNT
+  // lines, and change TryLock() to assert(0) or something.
+#   ifndef _WIN32_WINNT
+#     define _WIN32_WINNT 0x0400
+#   endif
+# endif
+// To avoid macro definition of ERROR.
+# ifndef NOGDI
+#  define NOGDI
+# endif
+// To avoid macro definition of min/max.
+# ifndef NOMINMAX
+#  define NOMINMAX
+# endif
+# include <windows.h>
+  typedef CRITICAL_SECTION MutexType;
+#elif defined(HAVE_PTHREAD) && defined(HAVE_RWLOCK)
+  // Needed for pthread_rwlock_*.  If it causes problems, you could take it
+  // out, but then you'd have to unset HAVE_RWLOCK (at least on linux -- it
+  // *does* cause problems for FreeBSD, or MacOSX, but isn't needed
+  // for locking there.)
+# ifdef __linux__
+#   ifndef _XOPEN_SOURCE  // Some other header might have already set it for us.
+#     define _XOPEN_SOURCE 500  // may be needed to get the rwlock calls
+#   endif
+# endif
+# include <pthread.h>
+  typedef pthread_rwlock_t MutexType;
+#elif defined(HAVE_PTHREAD)
+# include <pthread.h>
+  typedef pthread_mutex_t MutexType;
+#else
+# error Need to implement mutex.h for your architecture, or #define NO_THREADS
+#endif
+
+// We need to include these header files after defining _XOPEN_SOURCE
+// as they may define the _XOPEN_SOURCE macro.
+#include <assert.h>
+#include <stdlib.h>      // for abort()
+
+#define MUTEX_NAMESPACE glog_internal_namespace_
+
+namespace MUTEX_NAMESPACE {
+
+class Mutex {
+ public:
+  // Create a Mutex that is not held by anybody.  This constructor is
+  // typically used for Mutexes allocated on the heap or the stack.
+  // See below for a recommendation for constructing global Mutex
+  // objects.
+  inline Mutex();
+
+  // Destructor
+  inline ~Mutex();
+
+  inline void Lock();    // Block if needed until free then acquire exclusively
+  inline void Unlock();  // Release a lock acquired via Lock()
+#ifdef GMUTEX_TRYLOCK
+  inline bool TryLock(); // If free, Lock() and return true, else return false
+#endif
+  // Note that on systems that don't support read-write locks, these may
+  // be implemented as synonyms to Lock() and Unlock().  So you can use
+  // these for efficiency, but don't use them anyplace where being able
+  // to do shared reads is necessary to avoid deadlock.
+  inline void ReaderLock();   // Block until free or shared then acquire a share
+  inline void ReaderUnlock(); // Release a read share of this Mutex
+  inline void WriterLock() { Lock(); }     // Acquire an exclusive lock
+  inline void WriterUnlock() { Unlock(); } // Release a lock from WriterLock()
+
+  // TODO(hamaji): Do nothing, implement correctly.
+  inline void AssertHeld() {}
+
+ private:
+  MutexType mutex_;
+  // We want to make sure that the compiler sets is_safe_ to true only
+  // when we tell it to, and never makes assumptions is_safe_ is
+  // always true.  volatile is the most reliable way to do that.
+  volatile bool is_safe_;
+
+  inline void SetIsSafe() { is_safe_ = true; }
+
+  // Catch the error of writing Mutex when intending MutexLock.
+  Mutex(Mutex* /*ignored*/) {}
+  // Disallow "evil" constructors
+  Mutex(const Mutex&);
+  void operator=(const Mutex&);
+};
+
+// Now the implementation of Mutex for various systems
+#if defined(NO_THREADS)
+
+// When we don't have threads, we can be either reading or writing,
+// but not both.  We can have lots of readers at once (in no-threads
+// mode, that's most likely to happen in recursive function calls),
+// but only one writer.  We represent this by having mutex_ be -1 when
+// writing and a number > 0 when reading (and 0 when no lock is held).
+//
+// In debug mode, we assert these invariants, while in non-debug mode
+// we do nothing, for efficiency.  That's why everything is in an
+// assert.
+
+Mutex::Mutex() : mutex_(0) { }
+Mutex::~Mutex()            { assert(mutex_ == 0); }
+void Mutex::Lock()         { assert(--mutex_ == -1); }
+void Mutex::Unlock()       { assert(mutex_++ == -1); }
+#ifdef GMUTEX_TRYLOCK
+bool Mutex::TryLock()      { if (mutex_) return false; Lock(); return true; }
+#endif
+void Mutex::ReaderLock()   { assert(++mutex_ > 0); }
+void Mutex::ReaderUnlock() { assert(mutex_-- > 0); }
+
+#elif defined(_WIN32) || defined(__CYGWIN32__) || defined(__CYGWIN64__)
+
+Mutex::Mutex()             { InitializeCriticalSection(&mutex_); SetIsSafe(); }
+Mutex::~Mutex()            { DeleteCriticalSection(&mutex_); }
+void Mutex::Lock()         { if (is_safe_) EnterCriticalSection(&mutex_); }
+void Mutex::Unlock()       { if (is_safe_) LeaveCriticalSection(&mutex_); }
+#ifdef GMUTEX_TRYLOCK
+bool Mutex::TryLock()      { return is_safe_ ?
+                                 TryEnterCriticalSection(&mutex_) != 0 : true; }
+#endif
+void Mutex::ReaderLock()   { Lock(); }      // we don't have read-write locks
+void Mutex::ReaderUnlock() { Unlock(); }
+
+#elif defined(HAVE_PTHREAD) && defined(HAVE_RWLOCK)
+
+#define SAFE_PTHREAD(fncall)  do {   /* run fncall if is_safe_ is true */  \
+  if (is_safe_ && fncall(&mutex_) != 0) abort();                           \
+} while (0)
+
+Mutex::Mutex() {
+  SetIsSafe();
+  if (is_safe_ && pthread_rwlock_init(&mutex_, NULL) != 0) abort();
+}
+Mutex::~Mutex()            { SAFE_PTHREAD(pthread_rwlock_destroy); }
+void Mutex::Lock()         { SAFE_PTHREAD(pthread_rwlock_wrlock); }
+void Mutex::Unlock()       { SAFE_PTHREAD(pthread_rwlock_unlock); }
+#ifdef GMUTEX_TRYLOCK
+bool Mutex::TryLock()      { return is_safe_ ?
+                                    pthread_rwlock_trywrlock(&mutex_) == 0 :
+                                    true; }
+#endif
+void Mutex::ReaderLock()   { SAFE_PTHREAD(pthread_rwlock_rdlock); }
+void Mutex::ReaderUnlock() { SAFE_PTHREAD(pthread_rwlock_unlock); }
+#undef SAFE_PTHREAD
+
+#elif defined(HAVE_PTHREAD)
+
+#define SAFE_PTHREAD(fncall)  do {   /* run fncall if is_safe_ is true */  \
+  if (is_safe_ && fncall(&mutex_) != 0) abort();                           \
+} while (0)
+
+Mutex::Mutex()             {
+  SetIsSafe();
+  if (is_safe_ && pthread_mutex_init(&mutex_, NULL) != 0) abort();
+}
+Mutex::~Mutex()            { SAFE_PTHREAD(pthread_mutex_destroy); }
+void Mutex::Lock()         { SAFE_PTHREAD(pthread_mutex_lock); }
+void Mutex::Unlock()       { SAFE_PTHREAD(pthread_mutex_unlock); }
+#ifdef GMUTEX_TRYLOCK
+bool Mutex::TryLock()      { return is_safe_ ?
+                                 pthread_mutex_trylock(&mutex_) == 0 : true; }
+#endif
+void Mutex::ReaderLock()   { Lock(); }
+void Mutex::ReaderUnlock() { Unlock(); }
+#undef SAFE_PTHREAD
+
+#endif
+
+// --------------------------------------------------------------------------
+// Some helper classes
+
+// MutexLock(mu) acquires mu when constructed and releases it when destroyed.
+class MutexLock {
+ public:
+  explicit MutexLock(Mutex *mu) : mu_(mu) { mu_->Lock(); }
+  ~MutexLock() { mu_->Unlock(); }
+ private:
+  Mutex * const mu_;
+  // Disallow "evil" constructors
+  MutexLock(const MutexLock&);
+  void operator=(const MutexLock&);
+};
+
+// ReaderMutexLock and WriterMutexLock do the same, for rwlocks
+class ReaderMutexLock {
+ public:
+  explicit ReaderMutexLock(Mutex *mu) : mu_(mu) { mu_->ReaderLock(); }
+  ~ReaderMutexLock() { mu_->ReaderUnlock(); }
+ private:
+  Mutex * const mu_;
+  // Disallow "evil" constructors
+  ReaderMutexLock(const ReaderMutexLock&);
+  void operator=(const ReaderMutexLock&);
+};
+
+class WriterMutexLock {
+ public:
+  explicit WriterMutexLock(Mutex *mu) : mu_(mu) { mu_->WriterLock(); }
+  ~WriterMutexLock() { mu_->WriterUnlock(); }
+ private:
+  Mutex * const mu_;
+  // Disallow "evil" constructors
+  WriterMutexLock(const WriterMutexLock&);
+  void operator=(const WriterMutexLock&);
+};
+
+// Catch bug where variable name is omitted, e.g. MutexLock (&mu);
+#define MutexLock(x) COMPILE_ASSERT(0, mutex_lock_decl_missing_var_name)
+#define ReaderMutexLock(x) COMPILE_ASSERT(0, rmutex_lock_decl_missing_var_name)
+#define WriterMutexLock(x) COMPILE_ASSERT(0, wmutex_lock_decl_missing_var_name)
+
+}  // namespace MUTEX_NAMESPACE
+
+using namespace MUTEX_NAMESPACE;
+
+#undef MUTEX_NAMESPACE
+
+#endif  /* #define GOOGLE_MUTEX_H__ */
diff --git a/src/config.h.cmake.in b/src/config.h.cmake.in
new file mode 100644
index 000000000000..20f099050ee5
--- /dev/null
+++ b/src/config.h.cmake.in
@@ -0,0 +1,219 @@
+#ifndef GLOG_CONFIG_H
+#define GLOG_CONFIG_H
+
+/* define if glog doesn't use RTTI */
+#cmakedefine DISABLE_RTTI
+
+/* Namespace for Google classes */
+#cmakedefine GOOGLE_NAMESPACE ${GOOGLE_NAMESPACE}
+
+/* Define if you have the `dladdr' function */
+#cmakedefine HAVE_DLADDR
+
+/* Define if you have the `snprintf' function */
+#cmakedefine HAVE_SNPRINTF
+
+/* Define to 1 if you have the <dlfcn.h> header file. */
+#cmakedefine HAVE_DLFCN_H
+
+/* Define to 1 if you have the <execinfo.h> header file. */
+#cmakedefine HAVE_EXECINFO_H
+
+/* Define if you have the `fcntl' function */
+#cmakedefine HAVE_FCNTL
+
+/* Define to 1 if you have the <glob.h> header file. */
+#cmakedefine HAVE_GLOB_H
+
+/* Define to 1 if you have the <inttypes.h> header file. */
+#cmakedefine HAVE_INTTYPES_H ${HAVE_INTTYPES_H}
+
+/* Define to 1 if you have the `pthread' library (-lpthread). */
+#cmakedefine HAVE_LIBPTHREAD
+
+/* Define to 1 if you have the <libunwind.h> header file. */
+#cmakedefine HAVE_LIBUNWIND_H
+
+/* define if you have google gflags library */
+#cmakedefine HAVE_LIB_GFLAGS
+
+/* define if you have google gmock library */
+#cmakedefine HAVE_LIB_GMOCK
+
+/* define if you have google gtest library */
+#cmakedefine HAVE_LIB_GTEST
+
+/* define if you have libunwind */
+#cmakedefine HAVE_LIB_UNWIND
+
+/* Define to 1 if you have the <memory.h> header file. */
+#cmakedefine HAVE_MEMORY_H
+
+/* define to disable multithreading support. */
+#cmakedefine NO_THREADS
+
+/* define if the compiler implements namespaces */
+#cmakedefine HAVE_NAMESPACES
+
+/* Define if you have the 'pread' function */
+#cmakedefine HAVE_PREAD
+
+/* Define if you have POSIX threads libraries and header files. */
+#cmakedefine HAVE_PTHREAD
+
+/* Define to 1 if you have the <pwd.h> header file. */
+#cmakedefine HAVE_PWD_H
+
+/* Define if you have the 'pwrite' function */
+#cmakedefine HAVE_PWRITE
+
+/* define if the compiler implements pthread_rwlock_* */
+#cmakedefine HAVE_RWLOCK
+
+/* Define if you have the 'sigaction' function */
+#cmakedefine HAVE_SIGACTION
+
+/* Define if you have the `sigaltstack' function */
+#cmakedefine HAVE_SIGALTSTACK
+
+/* Define to 1 if you have the <stdint.h> header file. */
+#cmakedefine HAVE_STDINT_H ${HAVE_STDINT_H}
+
+/* Define to 1 if you have the <stdlib.h> header file. */
+#cmakedefine HAVE_STDLIB_H
+
+/* Define to 1 if you have the <strings.h> header file. */
+#cmakedefine HAVE_STRINGS_H
+
+/* Define to 1 if you have the <string.h> header file. */
+#cmakedefine HAVE_STRING_H
+
+/* Define to 1 if you have the <syscall.h> header file. */
+#cmakedefine HAVE_SYSCALL_H
+
+/* Define to 1 if you have the <syslog.h> header file. */
+#cmakedefine HAVE_SYSLOG_H
+
+/* Define to 1 if you have the <sys/stat.h> header file. */
+#cmakedefine HAVE_SYS_STAT_H
+
+/* Define to 1 if you have the <sys/syscall.h> header file. */
+#cmakedefine HAVE_SYS_SYSCALL_H
+
+/* Define to 1 if you have the <sys/time.h> header file. */
+#cmakedefine HAVE_SYS_TIME_H
+
+/* Define to 1 if you have the <sys/types.h> header file. */
+#cmakedefine HAVE_SYS_TYPES_H ${HAVE_SYS_TYPES_H}
+
+/* Define to 1 if you have the <sys/ucontext.h> header file. */
+#cmakedefine HAVE_SYS_UCONTEXT_H
+
+/* Define to 1 if you have the <sys/utsname.h> header file. */
+#cmakedefine HAVE_SYS_UTSNAME_H
+
+/* Define to 1 if you have the <sys/wait.h> header file. */
+#cmakedefine HAVE_SYS_WAIT_H
+
+/* Define to 1 if you have the <ucontext.h> header file. */
+#cmakedefine HAVE_UCONTEXT_H
+
+/* Define to 1 if you have the <unistd.h> header file. */
+#cmakedefine HAVE_UNISTD_H ${HAVE_UNISTD_H}
+
+/* Define to 1 if you have the <unwind.h> header file. */
+#cmakedefine HAVE_UNWIND_H ${HAVE_UNWIND_H}
+
+/* define if the compiler supports using expression for operator */
+#cmakedefine HAVE_USING_OPERATOR
+
+/* define if your compiler has __attribute__ */
+#cmakedefine HAVE___ATTRIBUTE__
+
+/* define if your compiler has __builtin_expect */
+#cmakedefine HAVE___BUILTIN_EXPECT ${HAVE___BUILTIN_EXPECT}
+
+/* define if your compiler has __sync_val_compare_and_swap */
+#cmakedefine HAVE___SYNC_VAL_COMPARE_AND_SWAP
+
+/* define if symbolize support is available */
+#cmakedefine HAVE_SYMBOLIZE
+
+/* define if localtime_r is available in time.h */
+#cmakedefine HAVE_LOCALTIME_R
+
+/* Define to the sub-directory in which libtool stores uninstalled libraries.
+   */
+#cmakedefine LT_OBJDIR
+
+/* Name of package */
+#cmakedefine PACKAGE
+
+/* Define to the address where bug reports for this package should be sent. */
+#cmakedefine PACKAGE_BUGREPORT
+
+/* Define to the full name of this package. */
+#cmakedefine PACKAGE_NAME
+
+/* Define to the full name and version of this package. */
+#cmakedefine PACKAGE_STRING
+
+/* Define to the one symbol short name of this package. */
+#cmakedefine PACKAGE_TARNAME
+
+/* Define to the home page for this package. */
+#cmakedefine PACKAGE_URL
+
+/* Define to the version of this package. */
+#cmakedefine PACKAGE_VERSION
+
+/* How to access the PC from a struct ucontext */
+#cmakedefine PC_FROM_UCONTEXT
+
+/* define if we should print file offsets in traces instead of symbolizing. */
+#cmakedefine PRINT_UNSYMBOLIZED_STACK_TRACES
+
+/* Define to necessary symbol if this constant uses a non-standard name on
+   your system. */
+#cmakedefine PTHREAD_CREATE_JOINABLE
+
+/* The size of `void *', as computed by sizeof. */
+#cmakedefine SIZEOF_VOID_P ${SIZEOF_VOID_P}
+
+/* Define to 1 if you have the ANSI C header files. */
+#cmakedefine STDC_HEADERS
+
+/* the namespace where STL code like vector<> is defined */
+#cmakedefine STL_NAMESPACE ${STL_NAMESPACE}
+
+/* location of source code */
+#cmakedefine TEST_SRC_DIR ${TEST_SRC_DIR}
+
+/* Define to necessary thread-local storage attribute. */
+#cmakedefine GLOG_THREAD_LOCAL_STORAGE ${GLOG_THREAD_LOCAL_STORAGE}
+
+/* Check whether aligned_storage and alignof present */
+#cmakedefine HAVE_ALIGNED_STORAGE ${HAVE_ALIGNED_STORAGE}
+
+/* Version number of package */
+#cmakedefine VERSION
+
+#ifdef GLOG_BAZEL_BUILD
+
+/* TODO(rodrigoq): remove this workaround once bazel#3979 is resolved:
+ * https://github.com/bazelbuild/bazel/issues/3979 */
+#define _START_GOOGLE_NAMESPACE_ namespace GOOGLE_NAMESPACE {
+
+#define _END_GOOGLE_NAMESPACE_ }
+
+#else
+
+/* Stops putting the code inside the Google namespace */
+#cmakedefine _END_GOOGLE_NAMESPACE_ ${_END_GOOGLE_NAMESPACE_}
+
+/* Puts following code inside the Google namespace */
+#cmakedefine _START_GOOGLE_NAMESPACE_ ${_START_GOOGLE_NAMESPACE_}
+
+#endif
+
+#endif  // GLOG_CONFIG_H
diff --git a/src/config_for_unittests.h b/src/config_for_unittests.h
new file mode 100644
index 000000000000..13ea8eab7a39
--- /dev/null
+++ b/src/config_for_unittests.h
@@ -0,0 +1,66 @@
+// Copyright (c) 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// ---
+// All Rights Reserved.
+//
+// Author: Craig Silverstein
+// Copied from google-perftools and modified by Shinichiro Hamaji
+//
+// This file is needed for windows -- unittests are not part of the
+// glog dll, but still want to include config.h just like the
+// dll does, so they can use internal tools and APIs for testing.
+//
+// The problem is that config.h declares GOOGLE_GLOG_DLL_DECL to be
+// for exporting symbols, but the unittest needs to *import* symbols
+// (since it's not the dll).
+//
+// The solution is to have this file, which is just like config.h but
+// sets GOOGLE_GLOG_DLL_DECL to do a dllimport instead of a dllexport.
+//
+// The reason we need this extra GOOGLE_GLOG_DLL_DECL_FOR_UNITTESTS
+// variable is in case people want to set GOOGLE_GLOG_DLL_DECL explicitly
+// to something other than __declspec(dllexport).  In that case, they
+// may want to use something other than __declspec(dllimport) for the
+// unittest case.  For that, we allow folks to define both
+// GOOGLE_GLOG_DLL_DECL and GOOGLE_GLOG_DLL_DECL_FOR_UNITTESTS explicitly.
+//
+// NOTE: This file is equivalent to config.h on non-windows systems,
+// which never defined GOOGLE_GLOG_DLL_DECL_FOR_UNITTESTS and always
+// define GOOGLE_GLOG_DLL_DECL to the empty string.
+
+#include "config.h"
+
+#undef GOOGLE_GLOG_DLL_DECL
+#ifdef GOOGLE_GLOG_DLL_DECL_FOR_UNITTESTS
+# define GOOGLE_GLOG_DLL_DECL  GOOGLE_GLOG_DLL_DECL_FOR_UNITTESTS
+#else
+// if DLL_DECL_FOR_UNITTESTS isn't defined, use ""
+# define GOOGLE_GLOG_DLL_DECL
+#endif
diff --git a/src/demangle.cc b/src/demangle.cc
new file mode 100644
index 000000000000..9369f9a65c2d
--- /dev/null
+++ b/src/demangle.cc
@@ -0,0 +1,1356 @@
+// Copyright (c) 2006, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Author: Satoru Takabayashi
+//
+// For reference check out:
+// http://itanium-cxx-abi.github.io/cxx-abi/abi.html#mangling
+//
+// Note that we only have partial C++0x support yet.
+
+#include <stdio.h>  // for NULL
+#include "utilities.h"
+#include "demangle.h"
+
+#if defined(OS_WINDOWS)
+#include <dbghelp.h>
+#pragma comment(lib, "dbghelp")
+#endif
+
+_START_GOOGLE_NAMESPACE_
+
+#if !defined(OS_WINDOWS)
+typedef struct {
+  const char *abbrev;
+  const char *real_name;
+} AbbrevPair;
+
+// List of operators from Itanium C++ ABI.
+static const AbbrevPair kOperatorList[] = {
+  { "nw", "new" },
+  { "na", "new[]" },
+  { "dl", "delete" },
+  { "da", "delete[]" },
+  { "ps", "+" },
+  { "ng", "-" },
+  { "ad", "&" },
+  { "de", "*" },
+  { "co", "~" },
+  { "pl", "+" },
+  { "mi", "-" },
+  { "ml", "*" },
+  { "dv", "/" },
+  { "rm", "%" },
+  { "an", "&" },
+  { "or", "|" },
+  { "eo", "^" },
+  { "aS", "=" },
+  { "pL", "+=" },
+  { "mI", "-=" },
+  { "mL", "*=" },
+  { "dV", "/=" },
+  { "rM", "%=" },
+  { "aN", "&=" },
+  { "oR", "|=" },
+  { "eO", "^=" },
+  { "ls", "<<" },
+  { "rs", ">>" },
+  { "lS", "<<=" },
+  { "rS", ">>=" },
+  { "eq", "==" },
+  { "ne", "!=" },
+  { "lt", "<" },
+  { "gt", ">" },
+  { "le", "<=" },
+  { "ge", ">=" },
+  { "nt", "!" },
+  { "aa", "&&" },
+  { "oo", "||" },
+  { "pp", "++" },
+  { "mm", "--" },
+  { "cm", "," },
+  { "pm", "->*" },
+  { "pt", "->" },
+  { "cl", "()" },
+  { "ix", "[]" },
+  { "qu", "?" },
+  { "st", "sizeof" },
+  { "sz", "sizeof" },
+  { NULL, NULL },
+};
+
+// List of builtin types from Itanium C++ ABI.
+static const AbbrevPair kBuiltinTypeList[] = {
+  { "v", "void" },
+  { "w", "wchar_t" },
+  { "b", "bool" },
+  { "c", "char" },
+  { "a", "signed char" },
+  { "h", "unsigned char" },
+  { "s", "short" },
+  { "t", "unsigned short" },
+  { "i", "int" },
+  { "j", "unsigned int" },
+  { "l", "long" },
+  { "m", "unsigned long" },
+  { "x", "long long" },
+  { "y", "unsigned long long" },
+  { "n", "__int128" },
+  { "o", "unsigned __int128" },
+  { "f", "float" },
+  { "d", "double" },
+  { "e", "long double" },
+  { "g", "__float128" },
+  { "z", "ellipsis" },
+  { NULL, NULL }
+};
+
+// List of substitutions Itanium C++ ABI.
+static const AbbrevPair kSubstitutionList[] = {
+  { "St", "" },
+  { "Sa", "allocator" },
+  { "Sb", "basic_string" },
+  // std::basic_string<char, std::char_traits<char>,std::allocator<char> >
+  { "Ss", "string"},
+  // std::basic_istream<char, std::char_traits<char> >
+  { "Si", "istream" },
+  // std::basic_ostream<char, std::char_traits<char> >
+  { "So", "ostream" },
+  // std::basic_iostream<char, std::char_traits<char> >
+  { "Sd", "iostream" },
+  { NULL, NULL }
+};
+
+// State needed for demangling.
+typedef struct {
+  const char *mangled_cur;  // Cursor of mangled name.
+  char *out_cur;            // Cursor of output string.
+  const char *out_begin;    // Beginning of output string.
+  const char *out_end;      // End of output string.
+  const char *prev_name;    // For constructors/destructors.
+  int prev_name_length;     // For constructors/destructors.
+  short nest_level;         // For nested names.
+  bool append;              // Append flag.
+  bool overflowed;          // True if output gets overflowed.
+} State;
+
+// We don't use strlen() in libc since it's not guaranteed to be async
+// signal safe.
+static size_t StrLen(const char *str) {
+  size_t len = 0;
+  while (*str != '\0') {
+    ++str;
+    ++len;
+  }
+  return len;
+}
+
+// Returns true if "str" has at least "n" characters remaining.
+static bool AtLeastNumCharsRemaining(const char *str, int n) {
+  for (int i = 0; i < n; ++i) {
+    if (str[i] == '\0') {
+      return false;
+    }
+  }
+  return true;
+}
+
+// Returns true if "str" has "prefix" as a prefix.
+static bool StrPrefix(const char *str, const char *prefix) {
+  size_t i = 0;
+  while (str[i] != '\0' && prefix[i] != '\0' &&
+         str[i] == prefix[i]) {
+    ++i;
+  }
+  return prefix[i] == '\0';  // Consumed everything in "prefix".
+}
+
+static void InitState(State *state, const char *mangled,
+                      char *out, int out_size) {
+  state->mangled_cur = mangled;
+  state->out_cur = out;
+  state->out_begin = out;
+  state->out_end = out + out_size;
+  state->prev_name  = NULL;
+  state->prev_name_length = -1;
+  state->nest_level = -1;
+  state->append = true;
+  state->overflowed = false;
+}
+
+// Returns true and advances "mangled_cur" if we find "one_char_token"
+// at "mangled_cur" position.  It is assumed that "one_char_token" does
+// not contain '\0'.
+static bool ParseOneCharToken(State *state, const char one_char_token) {
+  if (state->mangled_cur[0] == one_char_token) {
+    ++state->mangled_cur;
+    return true;
+  }
+  return false;
+}
+
+// Returns true and advances "mangled_cur" if we find "two_char_token"
+// at "mangled_cur" position.  It is assumed that "two_char_token" does
+// not contain '\0'.
+static bool ParseTwoCharToken(State *state, const char *two_char_token) {
+  if (state->mangled_cur[0] == two_char_token[0] &&
+      state->mangled_cur[1] == two_char_token[1]) {
+    state->mangled_cur += 2;
+    return true;
+  }
+  return false;
+}
+
+// Returns true and advances "mangled_cur" if we find any character in
+// "char_class" at "mangled_cur" position.
+static bool ParseCharClass(State *state, const char *char_class) {
+  const char *p = char_class;
+  for (; *p != '\0'; ++p) {
+    if (state->mangled_cur[0] == *p) {
+      ++state->mangled_cur;
+      return true;
+    }
+  }
+  return false;
+}
+
+// This function is used for handling an optional non-terminal.
+static bool Optional(bool) {
+  return true;
+}
+
+// This function is used for handling <non-terminal>+ syntax.
+typedef bool (*ParseFunc)(State *);
+static bool OneOrMore(ParseFunc parse_func, State *state) {
+  if (parse_func(state)) {
+    while (parse_func(state)) {
+    }
+    return true;
+  }
+  return false;
+}
+
+// This function is used for handling <non-terminal>* syntax. The function
+// always returns true and must be followed by a termination token or a
+// terminating sequence not handled by parse_func (e.g.
+// ParseOneCharToken(state, 'E')).
+static bool ZeroOrMore(ParseFunc parse_func, State *state) {
+  while (parse_func(state)) {
+  }
+  return true;
+}
+
+// Append "str" at "out_cur".  If there is an overflow, "overflowed"
+// is set to true for later use.  The output string is ensured to
+// always terminate with '\0' as long as there is no overflow.
+static void Append(State *state, const char * const str, const int length) {
+  int i;
+  for (i = 0; i < length; ++i) {
+    if (state->out_cur + 1 < state->out_end) {  // +1 for '\0'
+      *state->out_cur = str[i];
+      ++state->out_cur;
+    } else {
+      state->overflowed = true;
+      break;
+    }
+  }
+  if (!state->overflowed) {
+    *state->out_cur = '\0';  // Terminate it with '\0'
+  }
+}
+
+// We don't use equivalents in libc to avoid locale issues.
+static bool IsLower(char c) {
+  return c >= 'a' && c <= 'z';
+}
+
+static bool IsAlpha(char c) {
+  return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z');
+}
+
+static bool IsDigit(char c) {
+  return c >= '0' && c <= '9';
+}
+
+// Returns true if "str" is a function clone suffix.  These suffixes are used
+// by GCC 4.5.x and later versions to indicate functions which have been
+// cloned during optimization.  We treat any sequence (.<alpha>+.<digit>+)+ as
+// a function clone suffix.
+static bool IsFunctionCloneSuffix(const char *str) {
+  size_t i = 0;
+  while (str[i] != '\0') {
+    // Consume a single .<alpha>+.<digit>+ sequence.
+    if (str[i] != '.' || !IsAlpha(str[i + 1])) {
+      return false;
+    }
+    i += 2;
+    while (IsAlpha(str[i])) {
+      ++i;
+    }
+    if (str[i] != '.' || !IsDigit(str[i + 1])) {
+      return false;
+    }
+    i += 2;
+    while (IsDigit(str[i])) {
+      ++i;
+    }
+  }
+  return true;  // Consumed everything in "str".
+}
+
+// Append "str" with some tweaks, iff "append" state is true.
+// Returns true so that it can be placed in "if" conditions.
+static void MaybeAppendWithLength(State *state, const char * const str,
+                                  const int length) {
+  if (state->append && length > 0) {
+    // Append a space if the output buffer ends with '<' and "str"
+    // starts with '<' to avoid <<<.
+    if (str[0] == '<' && state->out_begin < state->out_cur  &&
+        state->out_cur[-1] == '<') {
+      Append(state, " ", 1);
+    }
+    // Remember the last identifier name for ctors/dtors.
+    if (IsAlpha(str[0]) || str[0] == '_') {
+      state->prev_name = state->out_cur;
+      state->prev_name_length = length;
+    }
+    Append(state, str, length);
+  }
+}
+
+// A convenient wrapper arount MaybeAppendWithLength().
+static bool MaybeAppend(State *state, const char * const str) {
+  if (state->append) {
+    int length = StrLen(str);
+    MaybeAppendWithLength(state, str, length);
+  }
+  return true;
+}
+
+// This function is used for handling nested names.
+static bool EnterNestedName(State *state) {
+  state->nest_level = 0;
+  return true;
+}
+
+// This function is used for handling nested names.
+static bool LeaveNestedName(State *state, short prev_value) {
+  state->nest_level = prev_value;
+  return true;
+}
+
+// Disable the append mode not to print function parameters, etc.
+static bool DisableAppend(State *state) {
+  state->append = false;
+  return true;
+}
+
+// Restore the append mode to the previous state.
+static bool RestoreAppend(State *state, bool prev_value) {
+  state->append = prev_value;
+  return true;
+}
+
+// Increase the nest level for nested names.
+static void MaybeIncreaseNestLevel(State *state) {
+  if (state->nest_level > -1) {
+    ++state->nest_level;
+  }
+}
+
+// Appends :: for nested names if necessary.
+static void MaybeAppendSeparator(State *state) {
+  if (state->nest_level >= 1) {
+    MaybeAppend(state, "::");
+  }
+}
+
+// Cancel the last separator if necessary.
+static void MaybeCancelLastSeparator(State *state) {
+  if (state->nest_level >= 1 && state->append &&
+      state->out_begin <= state->out_cur - 2) {
+    state->out_cur -= 2;
+    *state->out_cur = '\0';
+  }
+}
+
+// Returns true if the identifier of the given length pointed to by
+// "mangled_cur" is anonymous namespace.
+static bool IdentifierIsAnonymousNamespace(State *state, int length) {
+  static const char anon_prefix[] = "_GLOBAL__N_";
+  return (length > (int)sizeof(anon_prefix) - 1 &&  // Should be longer.
+          StrPrefix(state->mangled_cur, anon_prefix));
+}
+
+// Forward declarations of our parsing functions.
+static bool ParseMangledName(State *state);
+static bool ParseEncoding(State *state);
+static bool ParseName(State *state);
+static bool ParseUnscopedName(State *state);
+static bool ParseUnscopedTemplateName(State *state);
+static bool ParseNestedName(State *state);
+static bool ParsePrefix(State *state);
+static bool ParseUnqualifiedName(State *state);
+static bool ParseSourceName(State *state);
+static bool ParseLocalSourceName(State *state);
+static bool ParseNumber(State *state, int *number_out);
+static bool ParseFloatNumber(State *state);
+static bool ParseSeqId(State *state);
+static bool ParseIdentifier(State *state, int length);
+static bool ParseAbiTags(State *state);
+static bool ParseAbiTag(State *state);
+static bool ParseOperatorName(State *state);
+static bool ParseSpecialName(State *state);
+static bool ParseCallOffset(State *state);
+static bool ParseNVOffset(State *state);
+static bool ParseVOffset(State *state);
+static bool ParseCtorDtorName(State *state);
+static bool ParseType(State *state);
+static bool ParseCVQualifiers(State *state);
+static bool ParseBuiltinType(State *state);
+static bool ParseFunctionType(State *state);
+static bool ParseBareFunctionType(State *state);
+static bool ParseClassEnumType(State *state);
+static bool ParseArrayType(State *state);
+static bool ParsePointerToMemberType(State *state);
+static bool ParseTemplateParam(State *state);
+static bool ParseTemplateTemplateParam(State *state);
+static bool ParseTemplateArgs(State *state);
+static bool ParseTemplateArg(State *state);
+static bool ParseExpression(State *state);
+static bool ParseExprPrimary(State *state);
+static bool ParseLocalName(State *state);
+static bool ParseDiscriminator(State *state);
+static bool ParseSubstitution(State *state);
+
+// Implementation note: the following code is a straightforward
+// translation of the Itanium C++ ABI defined in BNF with a couple of
+// exceptions.
+//
+// - Support GNU extensions not defined in the Itanium C++ ABI
+// - <prefix> and <template-prefix> are combined to avoid infinite loop
+// - Reorder patterns to shorten the code
+// - Reorder patterns to give greedier functions precedence
+//   We'll mark "Less greedy than" for these cases in the code
+//
+// Each parsing function changes the state and returns true on
+// success.  Otherwise, don't change the state and returns false.  To
+// ensure that the state isn't changed in the latter case, we save the
+// original state before we call more than one parsing functions
+// consecutively with &&, and restore the state if unsuccessful.  See
+// ParseEncoding() as an example of this convention.  We follow the
+// convention throughout the code.
+//
+// Originally we tried to do demangling without following the full ABI
+// syntax but it turned out we needed to follow the full syntax to
+// parse complicated cases like nested template arguments.  Note that
+// implementing a full-fledged demangler isn't trivial (libiberty's
+// cp-demangle.c has +4300 lines).
+//
+// Note that (foo) in <(foo) ...> is a modifier to be ignored.
+//
+// Reference:
+// - Itanium C++ ABI
+//   <http://www.codesourcery.com/cxx-abi/abi.html#mangling>
+
+// <mangled-name> ::= _Z <encoding>
+static bool ParseMangledName(State *state) {
+  return ParseTwoCharToken(state, "_Z") && ParseEncoding(state);
+}
+
+// <encoding> ::= <(function) name> <bare-function-type>
+//            ::= <(data) name>
+//            ::= <special-name>
+static bool ParseEncoding(State *state) {
+  State copy = *state;
+  if (ParseName(state) && ParseBareFunctionType(state)) {
+    return true;
+  }
+  *state = copy;
+
+  if (ParseName(state) || ParseSpecialName(state)) {
+    return true;
+  }
+  return false;
+}
+
+// <name> ::= <nested-name>
+//        ::= <unscoped-template-name> <template-args>
+//        ::= <unscoped-name>
+//        ::= <local-name>
+static bool ParseName(State *state) {
+  if (ParseNestedName(state) || ParseLocalName(state)) {
+    return true;
+  }
+
+  State copy = *state;
+  if (ParseUnscopedTemplateName(state) &&
+      ParseTemplateArgs(state)) {
+    return true;
+  }
+  *state = copy;
+
+  // Less greedy than <unscoped-template-name> <template-args>.
+  if (ParseUnscopedName(state)) {
+    return true;
+  }
+  return false;
+}
+
+// <unscoped-name> ::= <unqualified-name>
+//                 ::= St <unqualified-name>
+static bool ParseUnscopedName(State *state) {
+  if (ParseUnqualifiedName(state)) {
+    return true;
+  }
+
+  State copy = *state;
+  if (ParseTwoCharToken(state, "St") &&
+      MaybeAppend(state, "std::") &&
+      ParseUnqualifiedName(state)) {
+    return true;
+  }
+  *state = copy;
+  return false;
+}
+
+// <unscoped-template-name> ::= <unscoped-name>
+//                          ::= <substitution>
+static bool ParseUnscopedTemplateName(State *state) {
+  return ParseUnscopedName(state) || ParseSubstitution(state);
+}
+
+// <nested-name> ::= N [<CV-qualifiers>] <prefix> <unqualified-name> E
+//               ::= N [<CV-qualifiers>] <template-prefix> <template-args> E
+static bool ParseNestedName(State *state) {
+  State copy = *state;
+  if (ParseOneCharToken(state, 'N') &&
+      EnterNestedName(state) &&
+      Optional(ParseCVQualifiers(state)) &&
+      ParsePrefix(state) &&
+      LeaveNestedName(state, copy.nest_level) &&
+      ParseOneCharToken(state, 'E')) {
+    return true;
+  }
+  *state = copy;
+  return false;
+}
+
+// This part is tricky.  If we literally translate them to code, we'll
+// end up infinite loop.  Hence we merge them to avoid the case.
+//
+// <prefix> ::= <prefix> <unqualified-name>
+//          ::= <template-prefix> <template-args>
+//          ::= <template-param>
+//          ::= <substitution>
+//          ::= # empty
+// <template-prefix> ::= <prefix> <(template) unqualified-name>
+//                   ::= <template-param>
+//                   ::= <substitution>
+static bool ParsePrefix(State *state) {
+  bool has_something = false;
+  while (true) {
+    MaybeAppendSeparator(state);
+    if (ParseTemplateParam(state) ||
+        ParseSubstitution(state) ||
+        ParseUnscopedName(state)) {
+      has_something = true;
+      MaybeIncreaseNestLevel(state);
+      continue;
+    }
+    MaybeCancelLastSeparator(state);
+    if (has_something && ParseTemplateArgs(state)) {
+      return ParsePrefix(state);
+    } else {
+      break;
+    }
+  }
+  return true;
+}
+
+// <unqualified-name> ::= <operator-name>
+//                    ::= <ctor-dtor-name>
+//                    ::= <source-name> [<abi-tags>]
+//                    ::= <local-source-name> [<abi-tags>]
+static bool ParseUnqualifiedName(State *state) {
+  return (ParseOperatorName(state) ||
+          ParseCtorDtorName(state) ||
+          (ParseSourceName(state) && Optional(ParseAbiTags(state))) ||
+          (ParseLocalSourceName(state) && Optional(ParseAbiTags(state))));
+}
+
+// <source-name> ::= <positive length number> <identifier>
+static bool ParseSourceName(State *state) {
+  State copy = *state;
+  int length = -1;
+  if (ParseNumber(state, &length) && ParseIdentifier(state, length)) {
+    return true;
+  }
+  *state = copy;
+  return false;
+}
+
+// <local-source-name> ::= L <source-name> [<discriminator>]
+//
+// References:
+//   http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31775
+//   http://gcc.gnu.org/viewcvs?view=rev&revision=124467
+static bool ParseLocalSourceName(State *state) {
+  State copy = *state;
+  if (ParseOneCharToken(state, 'L') && ParseSourceName(state) &&
+      Optional(ParseDiscriminator(state))) {
+    return true;
+  }
+  *state = copy;
+  return false;
+}
+
+// <number> ::= [n] <non-negative decimal integer>
+// If "number_out" is non-null, then *number_out is set to the value of the
+// parsed number on success.
+static bool ParseNumber(State *state, int *number_out) {
+  int sign = 1;
+  if (ParseOneCharToken(state, 'n')) {
+    sign = -1;
+  }
+  const char *p = state->mangled_cur;
+  int number = 0;
+  for (;*p != '\0'; ++p) {
+    if (IsDigit(*p)) {
+      number = number * 10 + (*p - '0');
+    } else {
+      break;
+    }
+  }
+  if (p != state->mangled_cur) {  // Conversion succeeded.
+    state->mangled_cur = p;
+    if (number_out != NULL) {
+      *number_out = number * sign;
+    }
+    return true;
+  }
+  return false;
+}
+
+// Floating-point literals are encoded using a fixed-length lowercase
+// hexadecimal string.
+static bool ParseFloatNumber(State *state) {
+  const char *p = state->mangled_cur;
+  for (;*p != '\0'; ++p) {
+    if (!IsDigit(*p) && !(*p >= 'a' && *p <= 'f')) {
+      break;
+    }
+  }
+  if (p != state->mangled_cur) {  // Conversion succeeded.
+    state->mangled_cur = p;
+    return true;
+  }
+  return false;
+}
+
+// The <seq-id> is a sequence number in base 36,
+// using digits and upper case letters
+static bool ParseSeqId(State *state) {
+  const char *p = state->mangled_cur;
+  for (;*p != '\0'; ++p) {
+    if (!IsDigit(*p) && !(*p >= 'A' && *p <= 'Z')) {
+      break;
+    }
+  }
+  if (p != state->mangled_cur) {  // Conversion succeeded.
+    state->mangled_cur = p;
+    return true;
+  }
+  return false;
+}
+
+// <identifier> ::= <unqualified source code identifier> (of given length)
+static bool ParseIdentifier(State *state, int length) {
+  if (length == -1 ||
+      !AtLeastNumCharsRemaining(state->mangled_cur, length)) {
+    return false;
+  }
+  if (IdentifierIsAnonymousNamespace(state, length)) {
+    MaybeAppend(state, "(anonymous namespace)");
+  } else {
+    MaybeAppendWithLength(state, state->mangled_cur, length);
+  }
+  state->mangled_cur += length;
+  return true;
+}
+
+// <abi-tags> ::= <abi-tag> [<abi-tags>]
+static bool ParseAbiTags(State *state) {
+  State copy = *state;
+  DisableAppend(state);
+  if (OneOrMore(ParseAbiTag, state)) {
+    RestoreAppend(state, copy.append);
+    return true;
+  }
+  *state = copy;
+  return false;
+}
+
+// <abi-tag> ::= B <source-name>
+static bool ParseAbiTag(State *state) {
+  return ParseOneCharToken(state, 'B') && ParseSourceName(state);
+}
+
+// <operator-name> ::= nw, and other two letters cases
+//                 ::= cv <type>  # (cast)
+//                 ::= v  <digit> <source-name> # vendor extended operator
+static bool ParseOperatorName(State *state) {
+  if (!AtLeastNumCharsRemaining(state->mangled_cur, 2)) {
+    return false;
+  }
+  // First check with "cv" (cast) case.
+  State copy = *state;
+  if (ParseTwoCharToken(state, "cv") &&
+      MaybeAppend(state, "operator ") &&
+      EnterNestedName(state) &&
+      ParseType(state) &&
+      LeaveNestedName(state, copy.nest_level)) {
+    return true;
+  }
+  *state = copy;
+
+  // Then vendor extended operators.
+  if (ParseOneCharToken(state, 'v') && ParseCharClass(state, "0123456789") &&
+      ParseSourceName(state)) {
+    return true;
+  }
+  *state = copy;
+
+  // Other operator names should start with a lower alphabet followed
+  // by a lower/upper alphabet.
+  if (!(IsLower(state->mangled_cur[0]) &&
+        IsAlpha(state->mangled_cur[1]))) {
+    return false;
+  }
+  // We may want to perform a binary search if we really need speed.
+  const AbbrevPair *p;
+  for (p = kOperatorList; p->abbrev != NULL; ++p) {
+    if (state->mangled_cur[0] == p->abbrev[0] &&
+        state->mangled_cur[1] == p->abbrev[1]) {
+      MaybeAppend(state, "operator");
+      if (IsLower(*p->real_name)) {  // new, delete, etc.
+        MaybeAppend(state, " ");
+      }
+      MaybeAppend(state, p->real_name);
+      state->mangled_cur += 2;
+      return true;
+    }
+  }
+  return false;
+}
+
+// <special-name> ::= TV <type>
+//                ::= TT <type>
+//                ::= TI <type>
+//                ::= TS <type>
+//                ::= Tc <call-offset> <call-offset> <(base) encoding>
+//                ::= GV <(object) name>
+//                ::= T <call-offset> <(base) encoding>
+// G++ extensions:
+//                ::= TC <type> <(offset) number> _ <(base) type>
+//                ::= TF <type>
+//                ::= TJ <type>
+//                ::= GR <name>
+//                ::= GA <encoding>
+//                ::= Th <call-offset> <(base) encoding>
+//                ::= Tv <call-offset> <(base) encoding>
+//
+// Note: we don't care much about them since they don't appear in
+// stack traces.  The are special data.
+static bool ParseSpecialName(State *state) {
+  State copy = *state;
+  if (ParseOneCharToken(state, 'T') &&
+      ParseCharClass(state, "VTIS") &&
+      ParseType(state)) {
+    return true;
+  }
+  *state = copy;
+
+  if (ParseTwoCharToken(state, "Tc") && ParseCallOffset(state) &&
+      ParseCallOffset(state) && ParseEncoding(state)) {
+    return true;
+  }
+  *state = copy;
+
+  if (ParseTwoCharToken(state, "GV") &&
+      ParseName(state)) {
+    return true;
+  }
+  *state = copy;
+
+  if (ParseOneCharToken(state, 'T') && ParseCallOffset(state) &&
+      ParseEncoding(state)) {
+    return true;
+  }
+  *state = copy;
+
+  // G++ extensions
+  if (ParseTwoCharToken(state, "TC") && ParseType(state) &&
+      ParseNumber(state, NULL) && ParseOneCharToken(state, '_') &&
+      DisableAppend(state) &&
+      ParseType(state)) {
+    RestoreAppend(state, copy.append);
+    return true;
+  }
+  *state = copy;
+
+  if (ParseOneCharToken(state, 'T') && ParseCharClass(state, "FJ") &&
+      ParseType(state)) {
+    return true;
+  }
+  *state = copy;
+
+  if (ParseTwoCharToken(state, "GR") && ParseName(state)) {
+    return true;
+  }
+  *state = copy;
+
+  if (ParseTwoCharToken(state, "GA") && ParseEncoding(state)) {
+    return true;
+  }
+  *state = copy;
+
+  if (ParseOneCharToken(state, 'T') && ParseCharClass(state, "hv") &&
+      ParseCallOffset(state) && ParseEncoding(state)) {
+    return true;
+  }
+  *state = copy;
+  return false;
+}
+
+// <call-offset> ::= h <nv-offset> _
+//               ::= v <v-offset> _
+static bool ParseCallOffset(State *state) {
+  State copy = *state;
+  if (ParseOneCharToken(state, 'h') &&
+      ParseNVOffset(state) && ParseOneCharToken(state, '_')) {
+    return true;
+  }
+  *state = copy;
+
+  if (ParseOneCharToken(state, 'v') &&
+      ParseVOffset(state) && ParseOneCharToken(state, '_')) {
+    return true;
+  }
+  *state = copy;
+
+  return false;
+}
+
+// <nv-offset> ::= <(offset) number>
+static bool ParseNVOffset(State *state) {
+  return ParseNumber(state, NULL);
+}
+
+// <v-offset>  ::= <(offset) number> _ <(virtual offset) number>
+static bool ParseVOffset(State *state) {
+  State copy = *state;
+  if (ParseNumber(state, NULL) && ParseOneCharToken(state, '_') &&
+      ParseNumber(state, NULL)) {
+    return true;
+  }
+  *state = copy;
+  return false;
+}
+
+// <ctor-dtor-name> ::= C1 | C2 | C3
+//                  ::= D0 | D1 | D2
+static bool ParseCtorDtorName(State *state) {
+  State copy = *state;
+  if (ParseOneCharToken(state, 'C') &&
+      ParseCharClass(state, "123")) {
+    const char * const prev_name = state->prev_name;
+    const int prev_name_length = state->prev_name_length;
+    MaybeAppendWithLength(state, prev_name, prev_name_length);
+    return true;
+  }
+  *state = copy;
+
+  if (ParseOneCharToken(state, 'D') &&
+      ParseCharClass(state, "012")) {
+    const char * const prev_name = state->prev_name;
+    const int prev_name_length = state->prev_name_length;
+    MaybeAppend(state, "~");
+    MaybeAppendWithLength(state, prev_name, prev_name_length);
+    return true;
+  }
+  *state = copy;
+  return false;
+}
+
+// <type> ::= <CV-qualifiers> <type>
+//        ::= P <type>   # pointer-to
+//        ::= R <type>   # reference-to
+//        ::= O <type>   # rvalue reference-to (C++0x)
+//        ::= C <type>   # complex pair (C 2000)
+//        ::= G <type>   # imaginary (C 2000)
+//        ::= U <source-name> <type>  # vendor extended type qualifier
+//        ::= <builtin-type>
+//        ::= <function-type>
+//        ::= <class-enum-type>
+//        ::= <array-type>
+//        ::= <pointer-to-member-type>
+//        ::= <template-template-param> <template-args>
+//        ::= <template-param>
+//        ::= <substitution>
+//        ::= Dp <type>          # pack expansion of (C++0x)
+//        ::= Dt <expression> E  # decltype of an id-expression or class
+//                               # member access (C++0x)
+//        ::= DT <expression> E  # decltype of an expression (C++0x)
+//
+static bool ParseType(State *state) {
+  // We should check CV-qualifers, and PRGC things first.
+  State copy = *state;
+  if (ParseCVQualifiers(state) && ParseType(state)) {
+    return true;
+  }
+  *state = copy;
+
+  if (ParseCharClass(state, "OPRCG") && ParseType(state)) {
+    return true;
+  }
+  *state = copy;
+
+  if (ParseTwoCharToken(state, "Dp") && ParseType(state)) {
+    return true;
+  }
+  *state = copy;
+
+  if (ParseOneCharToken(state, 'D') && ParseCharClass(state, "tT") &&
+      ParseExpression(state) && ParseOneCharToken(state, 'E')) {
+    return true;
+  }
+  *state = copy;
+
+  if (ParseOneCharToken(state, 'U') && ParseSourceName(state) &&
+      ParseType(state)) {
+    return true;
+  }
+  *state = copy;
+
+  if (ParseBuiltinType(state) ||
+      ParseFunctionType(state) ||
+      ParseClassEnumType(state) ||
+      ParseArrayType(state) ||
+      ParsePointerToMemberType(state) ||
+      ParseSubstitution(state)) {
+    return true;
+  }
+
+  if (ParseTemplateTemplateParam(state) &&
+      ParseTemplateArgs(state)) {
+    return true;
+  }
+  *state = copy;
+
+  // Less greedy than <template-template-param> <template-args>.
+  if (ParseTemplateParam(state)) {
+    return true;
+  }
+
+  return false;
+}
+
+// <CV-qualifiers> ::= [r] [V] [K]
+// We don't allow empty <CV-qualifiers> to avoid infinite loop in
+// ParseType().
+static bool ParseCVQualifiers(State *state) {
+  int num_cv_qualifiers = 0;
+  num_cv_qualifiers += ParseOneCharToken(state, 'r');
+  num_cv_qualifiers += ParseOneCharToken(state, 'V');
+  num_cv_qualifiers += ParseOneCharToken(state, 'K');
+  return num_cv_qualifiers > 0;
+}
+
+// <builtin-type> ::= v, etc.
+//                ::= u <source-name>
+static bool ParseBuiltinType(State *state) {
+  const AbbrevPair *p;
+  for (p = kBuiltinTypeList; p->abbrev != NULL; ++p) {
+    if (state->mangled_cur[0] == p->abbrev[0]) {
+      MaybeAppend(state, p->real_name);
+      ++state->mangled_cur;
+      return true;
+    }
+  }
+
+  State copy = *state;
+  if (ParseOneCharToken(state, 'u') && ParseSourceName(state)) {
+    return true;
+  }
+  *state = copy;
+  return false;
+}
+
+// <function-type> ::= F [Y] <bare-function-type> E
+static bool ParseFunctionType(State *state) {
+  State copy = *state;
+  if (ParseOneCharToken(state, 'F') &&
+      Optional(ParseOneCharToken(state, 'Y')) &&
+      ParseBareFunctionType(state) && ParseOneCharToken(state, 'E')) {
+    return true;
+  }
+  *state = copy;
+  return false;
+}
+
+// <bare-function-type> ::= <(signature) type>+
+static bool ParseBareFunctionType(State *state) {
+  State copy = *state;
+  DisableAppend(state);
+  if (OneOrMore(ParseType, state)) {
+    RestoreAppend(state, copy.append);
+    MaybeAppend(state, "()");
+    return true;
+  }
+  *state = copy;
+  return false;
+}
+
+// <class-enum-type> ::= <name>
+static bool ParseClassEnumType(State *state) {
+  return ParseName(state);
+}
+
+// <array-type> ::= A <(positive dimension) number> _ <(element) type>
+//              ::= A [<(dimension) expression>] _ <(element) type>
+static bool ParseArrayType(State *state) {
+  State copy = *state;
+  if (ParseOneCharToken(state, 'A') && ParseNumber(state, NULL) &&
+      ParseOneCharToken(state, '_') && ParseType(state)) {
+    return true;
+  }
+  *state = copy;
+
+  if (ParseOneCharToken(state, 'A') && Optional(ParseExpression(state)) &&
+      ParseOneCharToken(state, '_') && ParseType(state)) {
+    return true;
+  }
+  *state = copy;
+  return false;
+}
+
+// <pointer-to-member-type> ::= M <(class) type> <(member) type>
+static bool ParsePointerToMemberType(State *state) {
+  State copy = *state;
+  if (ParseOneCharToken(state, 'M') && ParseType(state) &&
+      ParseType(state)) {
+    return true;
+  }
+  *state = copy;
+  return false;
+}
+
+// <template-param> ::= T_
+//                  ::= T <parameter-2 non-negative number> _
+static bool ParseTemplateParam(State *state) {
+  if (ParseTwoCharToken(state, "T_")) {
+    MaybeAppend(state, "?");  // We don't support template substitutions.
+    return true;
+  }
+
+  State copy = *state;
+  if (ParseOneCharToken(state, 'T') && ParseNumber(state, NULL) &&
+      ParseOneCharToken(state, '_')) {
+    MaybeAppend(state, "?");  // We don't support template substitutions.
+    return true;
+  }
+  *state = copy;
+  return false;
+}
+
+
+// <template-template-param> ::= <template-param>
+//                           ::= <substitution>
+static bool ParseTemplateTemplateParam(State *state) {
+  return (ParseTemplateParam(state) ||
+          ParseSubstitution(state));
+}
+
+// <template-args> ::= I <template-arg>+ E
+static bool ParseTemplateArgs(State *state) {
+  State copy = *state;
+  DisableAppend(state);
+  if (ParseOneCharToken(state, 'I') &&
+      OneOrMore(ParseTemplateArg, state) &&
+      ParseOneCharToken(state, 'E')) {
+    RestoreAppend(state, copy.append);
+    MaybeAppend(state, "<>");
+    return true;
+  }
+  *state = copy;
+  return false;
+}
+
+// <template-arg>  ::= <type>
+//                 ::= <expr-primary>
+//                 ::= I <template-arg>* E        # argument pack
+//                 ::= J <template-arg>* E        # argument pack
+//                 ::= X <expression> E
+static bool ParseTemplateArg(State *state) {
+  State copy = *state;
+  if ((ParseOneCharToken(state, 'I') || ParseOneCharToken(state, 'J')) &&
+      ZeroOrMore(ParseTemplateArg, state) &&
+      ParseOneCharToken(state, 'E')) {
+    return true;
+  }
+  *state = copy;
+
+  if (ParseType(state) ||
+      ParseExprPrimary(state)) {
+    return true;
+  }
+  *state = copy;
+
+  if (ParseOneCharToken(state, 'X') && ParseExpression(state) &&
+      ParseOneCharToken(state, 'E')) {
+    return true;
+  }
+  *state = copy;
+  return false;
+}
+
+// <expression> ::= <template-param>
+//              ::= <expr-primary>
+//              ::= <unary operator-name> <expression>
+//              ::= <binary operator-name> <expression> <expression>
+//              ::= <trinary operator-name> <expression> <expression>
+//                  <expression>
+//              ::= st <type>
+//              ::= sr <type> <unqualified-name> <template-args>
+//              ::= sr <type> <unqualified-name>
+static bool ParseExpression(State *state) {
+  if (ParseTemplateParam(state) || ParseExprPrimary(state)) {
+    return true;
+  }
+
+  State copy = *state;
+  if (ParseOperatorName(state) &&
+      ParseExpression(state) &&
+      ParseExpression(state) &&
+      ParseExpression(state)) {
+    return true;
+  }
+  *state = copy;
+
+  if (ParseOperatorName(state) &&
+      ParseExpression(state) &&
+      ParseExpression(state)) {
+    return true;
+  }
+  *state = copy;
+
+  if (ParseOperatorName(state) &&
+      ParseExpression(state)) {
+    return true;
+  }
+  *state = copy;
+
+  if (ParseTwoCharToken(state, "st") && ParseType(state)) {
+    return true;
+  }
+  *state = copy;
+
+  if (ParseTwoCharToken(state, "sr") && ParseType(state) &&
+      ParseUnqualifiedName(state) &&
+      ParseTemplateArgs(state)) {
+    return true;
+  }
+  *state = copy;
+
+  if (ParseTwoCharToken(state, "sr") && ParseType(state) &&
+      ParseUnqualifiedName(state)) {
+    return true;
+  }
+  *state = copy;
+  return false;
+}
+
+// <expr-primary> ::= L <type> <(value) number> E
+//                ::= L <type> <(value) float> E
+//                ::= L <mangled-name> E
+//                // A bug in g++'s C++ ABI version 2 (-fabi-version=2).
+//                ::= LZ <encoding> E
+static bool ParseExprPrimary(State *state) {
+  State copy = *state;
+  if (ParseOneCharToken(state, 'L') && ParseType(state) &&
+      ParseNumber(state, NULL) &&
+      ParseOneCharToken(state, 'E')) {
+    return true;
+  }
+  *state = copy;
+
+  if (ParseOneCharToken(state, 'L') && ParseType(state) &&
+      ParseFloatNumber(state) &&
+      ParseOneCharToken(state, 'E')) {
+    return true;
+  }
+  *state = copy;
+
+  if (ParseOneCharToken(state, 'L') && ParseMangledName(state) &&
+      ParseOneCharToken(state, 'E')) {
+    return true;
+  }
+  *state = copy;
+
+  if (ParseTwoCharToken(state, "LZ") && ParseEncoding(state) &&
+      ParseOneCharToken(state, 'E')) {
+    return true;
+  }
+  *state = copy;
+
+  return false;
+}
+
+// <local-name> := Z <(function) encoding> E <(entity) name>
+//                 [<discriminator>]
+//              := Z <(function) encoding> E s [<discriminator>]
+static bool ParseLocalName(State *state) {
+  State copy = *state;
+  if (ParseOneCharToken(state, 'Z') && ParseEncoding(state) &&
+      ParseOneCharToken(state, 'E') && MaybeAppend(state, "::") &&
+      ParseName(state) && Optional(ParseDiscriminator(state))) {
+    return true;
+  }
+  *state = copy;
+
+  if (ParseOneCharToken(state, 'Z') && ParseEncoding(state) &&
+      ParseTwoCharToken(state, "Es") && Optional(ParseDiscriminator(state))) {
+    return true;
+  }
+  *state = copy;
+  return false;
+}
+
+// <discriminator> := _ <(non-negative) number>
+static bool ParseDiscriminator(State *state) {
+  State copy = *state;
+  if (ParseOneCharToken(state, '_') && ParseNumber(state, NULL)) {
+    return true;
+  }
+  *state = copy;
+  return false;
+}
+
+// <substitution> ::= S_
+//                ::= S <seq-id> _
+//                ::= St, etc.
+static bool ParseSubstitution(State *state) {
+  if (ParseTwoCharToken(state, "S_")) {
+    MaybeAppend(state, "?");  // We don't support substitutions.
+    return true;
+  }
+
+  State copy = *state;
+  if (ParseOneCharToken(state, 'S') && ParseSeqId(state) &&
+      ParseOneCharToken(state, '_')) {
+    MaybeAppend(state, "?");  // We don't support substitutions.
+    return true;
+  }
+  *state = copy;
+
+  // Expand abbreviations like "St" => "std".
+  if (ParseOneCharToken(state, 'S')) {
+    const AbbrevPair *p;
+    for (p = kSubstitutionList; p->abbrev != NULL; ++p) {
+      if (state->mangled_cur[0] == p->abbrev[1]) {
+        MaybeAppend(state, "std");
+        if (p->real_name[0] != '\0') {
+          MaybeAppend(state, "::");
+          MaybeAppend(state, p->real_name);
+        }
+        ++state->mangled_cur;
+        return true;
+      }
+    }
+  }
+  *state = copy;
+  return false;
+}
+
+// Parse <mangled-name>, optionally followed by either a function-clone suffix
+// or version suffix.  Returns true only if all of "mangled_cur" was consumed.
+static bool ParseTopLevelMangledName(State *state) {
+  if (ParseMangledName(state)) {
+    if (state->mangled_cur[0] != '\0') {
+      // Drop trailing function clone suffix, if any.
+      if (IsFunctionCloneSuffix(state->mangled_cur)) {
+        return true;
+      }
+      // Append trailing version suffix if any.
+      // ex. _Z3foo@@GLIBCXX_3.4
+      if (state->mangled_cur[0] == '@') {
+        MaybeAppend(state, state->mangled_cur);
+        return true;
+      }
+      return false;  // Unconsumed suffix.
+    }
+    return true;
+  }
+  return false;
+}
+#endif
+
+// The demangler entry point.
+bool Demangle(const char *mangled, char *out, int out_size) {
+#if defined(OS_WINDOWS)
+  // When built with incremental linking, the Windows debugger
+  // library provides a more complicated `Symbol->Name` with the
+  // Incremental Linking Table offset, which looks like
+  // `@ILT+1105(?func@Foo@@SAXH@Z)`. However, the demangler expects
+  // only the mangled symbol, `?func@Foo@@SAXH@Z`. Fortunately, the
+  // mangled symbol is guaranteed not to have parentheses,
+  // so we search for `(` and extract up to `)`.
+  //
+  // Since we may be in a signal handler here, we cannot use `std::string`.
+  char buffer[1024];  // Big enough for a sane symbol.
+  const char *lparen = strchr(mangled, '(');
+  if (lparen) {
+    // Extract the string `(?...)`
+    const char *rparen = strchr(lparen, ')');
+    size_t length = rparen - lparen - 1;
+    strncpy(buffer, lparen + 1, length);
+    buffer[length] = '\0';
+    mangled = buffer;
+  } // Else the symbol wasn't inside a set of parentheses
+  // We use the ANSI version to ensure the string type is always `char *`.
+  return UnDecorateSymbolName(mangled, out, out_size, UNDNAME_COMPLETE);
+#else
+  State state;
+  InitState(&state, mangled, out, out_size);
+  return ParseTopLevelMangledName(&state) && !state.overflowed;
+#endif
+}
+
+_END_GOOGLE_NAMESPACE_
diff --git a/src/demangle.h b/src/demangle.h
new file mode 100644
index 000000000000..991b6ffcf2e6
--- /dev/null
+++ b/src/demangle.h
@@ -0,0 +1,85 @@
+// Copyright (c) 2006, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Author: Satoru Takabayashi
+//
+// An async-signal-safe and thread-safe demangler for Itanium C++ ABI
+// (aka G++ V3 ABI).
+
+// The demangler is implemented to be used in async signal handlers to
+// symbolize stack traces.  We cannot use libstdc++'s
+// abi::__cxa_demangle() in such signal handlers since it's not async
+// signal safe (it uses malloc() internally).
+//
+// Note that this demangler doesn't support full demangling.  More
+// specifically, it doesn't print types of function parameters and
+// types of template arguments.  It just skips them.  However, it's
+// still very useful to extract basic information such as class,
+// function, constructor, destructor, and operator names.
+//
+// See the implementation note in demangle.cc if you are interested.
+//
+// Example:
+//
+// | Mangled Name  | The Demangler | abi::__cxa_demangle()
+// |---------------|---------------|-----------------------
+// | _Z1fv         | f()           | f()
+// | _Z1fi         | f()           | f(int)
+// | _Z3foo3bar    | foo()         | foo(bar)
+// | _Z1fIiEvi     | f<>()         | void f<int>(int)
+// | _ZN1N1fE      | N::f          | N::f
+// | _ZN3Foo3BarEv | Foo::Bar()    | Foo::Bar()
+// | _Zrm1XS_"     | operator%()   | operator%(X, X)
+// | _ZN3FooC1Ev   | Foo::Foo()    | Foo::Foo()
+// | _Z1fSs        | f()           | f(std::basic_string<char,
+// |               |               |   std::char_traits<char>,
+// |               |               |   std::allocator<char> >)
+//
+// See the unit test for more examples.
+//
+// Note: we might want to write demanglers for ABIs other than Itanium
+// C++ ABI in the future.
+//
+
+#ifndef BASE_DEMANGLE_H_
+#define BASE_DEMANGLE_H_
+
+#include "config.h"
+#include "glog/logging.h"
+
+_START_GOOGLE_NAMESPACE_
+
+// Demangle "mangled".  On success, return true and write the
+// demangled symbol name to "out".  Otherwise, return false.
+// "out" is modified even if demangling is unsuccessful.
+bool GOOGLE_GLOG_DLL_DECL Demangle(const char *mangled, char *out, int out_size);
+
+_END_GOOGLE_NAMESPACE_
+
+#endif  // BASE_DEMANGLE_H_
diff --git a/src/demangle_unittest.cc b/src/demangle_unittest.cc
new file mode 100644
index 000000000000..be483411f1a0
--- /dev/null
+++ b/src/demangle_unittest.cc
@@ -0,0 +1,168 @@
+// Copyright (c) 2006, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Author: Satoru Takabayashi
+//
+// Unit tests for functions in demangle.c.
+
+#include "utilities.h"
+
+#include <iostream>
+#include <fstream>
+#include <string>
+#include "glog/logging.h"
+#include "demangle.h"
+#include "googletest.h"
+#include "config.h"
+
+#ifdef HAVE_LIB_GFLAGS
+#include <gflags/gflags.h>
+using namespace GFLAGS_NAMESPACE;
+#endif
+
+GLOG_DEFINE_bool(demangle_filter, false,
+                 "Run demangle_unittest in filter mode");
+
+using namespace std;
+using namespace GOOGLE_NAMESPACE;
+
+// A wrapper function for Demangle() to make the unit test simple.
+static const char *DemangleIt(const char * const mangled) {
+  static char demangled[4096];
+  if (Demangle(mangled, demangled, sizeof(demangled))) {
+    return demangled;
+  } else {
+    return mangled;
+  }
+}
+
+#if defined(OS_WINDOWS)
+
+TEST(Demangle, Windows) {
+  EXPECT_STREQ(
+    "public: static void __cdecl Foo::func(int)",
+    DemangleIt("?func@Foo@@SAXH@Z"));
+  EXPECT_STREQ(
+    "public: static void __cdecl Foo::func(int)",
+    DemangleIt("@ILT+1105(?func@Foo@@SAXH@Z)"));
+  EXPECT_STREQ(
+    "int __cdecl foobarArray(int * const)",
+    DemangleIt("?foobarArray@@YAHQAH@Z"));
+}
+
+#else
+
+// Test corner cases of bounary conditions.
+TEST(Demangle, CornerCases) {
+  const size_t size = 10;
+  char tmp[size] = { 0 };
+  const char *demangled = "foobar()";
+  const char *mangled = "_Z6foobarv";
+  EXPECT_TRUE(Demangle(mangled, tmp, sizeof(tmp)));
+  // sizeof("foobar()") == size - 1
+  EXPECT_STREQ(demangled, tmp);
+  EXPECT_TRUE(Demangle(mangled, tmp, size - 1));
+  EXPECT_STREQ(demangled, tmp);
+  EXPECT_FALSE(Demangle(mangled, tmp, size - 2));  // Not enough.
+  EXPECT_FALSE(Demangle(mangled, tmp, 1));
+  EXPECT_FALSE(Demangle(mangled, tmp, 0));
+  EXPECT_FALSE(Demangle(mangled, NULL, 0));  // Should not cause SEGV.
+}
+
+// Test handling of functions suffixed with .clone.N, which is used by GCC
+// 4.5.x, and .constprop.N and .isra.N, which are used by GCC 4.6.x.  These
+// suffixes are used to indicate functions which have been cloned during
+// optimization.  We ignore these suffixes.
+TEST(Demangle, Clones) {
+  char tmp[20];
+  EXPECT_TRUE(Demangle("_ZL3Foov", tmp, sizeof(tmp)));
+  EXPECT_STREQ("Foo()", tmp);
+  EXPECT_TRUE(Demangle("_ZL3Foov.clone.3", tmp, sizeof(tmp)));
+  EXPECT_STREQ("Foo()", tmp);
+  EXPECT_TRUE(Demangle("_ZL3Foov.constprop.80", tmp, sizeof(tmp)));
+  EXPECT_STREQ("Foo()", tmp);
+  EXPECT_TRUE(Demangle("_ZL3Foov.isra.18", tmp, sizeof(tmp)));
+  EXPECT_STREQ("Foo()", tmp);
+  EXPECT_TRUE(Demangle("_ZL3Foov.isra.2.constprop.18", tmp, sizeof(tmp)));
+  EXPECT_STREQ("Foo()", tmp);
+  // Invalid (truncated), should not demangle.
+  EXPECT_FALSE(Demangle("_ZL3Foov.clo", tmp, sizeof(tmp)));
+  // Invalid (.clone. not followed by number), should not demangle.
+  EXPECT_FALSE(Demangle("_ZL3Foov.clone.", tmp, sizeof(tmp)));
+  // Invalid (.clone. followed by non-number), should not demangle.
+  EXPECT_FALSE(Demangle("_ZL3Foov.clone.foo", tmp, sizeof(tmp)));
+  // Invalid (.constprop. not followed by number), should not demangle.
+  EXPECT_FALSE(Demangle("_ZL3Foov.isra.2.constprop.", tmp, sizeof(tmp)));
+}
+
+TEST(Demangle, FromFile) {
+  string test_file = FLAGS_test_srcdir + "/src/demangle_unittest.txt";
+  ifstream f(test_file.c_str());  // The file should exist.
+  EXPECT_FALSE(f.fail());
+
+  string line;
+  while (getline(f, line)) {
+    // Lines start with '#' are considered as comments.
+    if (line.empty() || line[0] == '#') {
+      continue;
+    }
+    // Each line should contain a mangled name and a demangled name
+    // separated by '\t'.  Example: "_Z3foo\tfoo"
+    string::size_type tab_pos = line.find('\t');
+    EXPECT_NE(string::npos, tab_pos);
+    string mangled = line.substr(0, tab_pos);
+    string demangled = line.substr(tab_pos + 1);
+    EXPECT_EQ(demangled, DemangleIt(mangled.c_str()));
+  }
+}
+
+#endif
+
+int main(int argc, char **argv) {
+#ifdef HAVE_LIB_GFLAGS
+  ParseCommandLineFlags(&argc, &argv, true);
+#endif
+  InitGoogleTest(&argc, argv);
+
+  FLAGS_logtostderr = true;
+  InitGoogleLogging(argv[0]);
+  if (FLAGS_demangle_filter) {
+    // Read from cin and write to cout.
+    string line;
+    while (getline(cin, line, '\n')) {
+      cout << DemangleIt(line.c_str()) << endl;
+    }
+    return 0;
+  } else if (argc > 1) {
+    cout << DemangleIt(argv[1]) << endl;
+    return 0;
+  } else {
+    return RUN_ALL_TESTS();
+  }
+}
diff --git a/src/demangle_unittest.sh b/src/demangle_unittest.sh
new file mode 100755
index 000000000000..91deee2198da
--- /dev/null
+++ b/src/demangle_unittest.sh
@@ -0,0 +1,95 @@
+#! /bin/sh
+#
+# Copyright (c) 2006, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#
+# Author: Satoru Takabayashi
+#
+# Unit tests for demangle.c with a real binary.
+
+set -e
+
+die () {
+    echo $1
+    exit 1
+}
+
+BINDIR=".libs"
+LIBGLOG="$BINDIR/libglog.so"
+
+DEMANGLER="$BINDIR/demangle_unittest"
+
+if test -e "$DEMANGLER"; then
+  # We need shared object.
+  export LD_LIBRARY_PATH=$BINDIR
+  export DYLD_LIBRARY_PATH=$BINDIR
+else
+  # For windows
+  DEMANGLER="./demangle_unittest.exe"
+  if ! test -e "$DEMANGLER"; then
+    echo "We coundn't find demangle_unittest binary."
+    exit 1
+  fi
+fi
+
+# Extract C++ mangled symbols from libbase.so.
+NM_OUTPUT="demangle.nm"
+nm "$LIBGLOG" | perl -nle 'print $1 if /\s(_Z\S+$)/' > "$NM_OUTPUT"
+
+# Check if mangled symbols exist. If there are none, we quit.
+# The binary is more likely compiled with GCC 2.95 or something old.
+if ! grep --quiet '^_Z' "$NM_OUTPUT"; then
+    echo "PASS"
+    exit 0
+fi
+
+# Demangle the symbols using our demangler.
+DM_OUTPUT="demangle.dm"
+GLOG_demangle_filter=1 "$DEMANGLER" --demangle_filter < "$NM_OUTPUT" > "$DM_OUTPUT"
+
+# Calculate the numbers of lines.
+NM_LINES=`wc -l "$NM_OUTPUT" | awk '{ print $1 }'`
+DM_LINES=`wc -l "$DM_OUTPUT" | awk '{ print $1 }'`
+
+# Compare the numbers of lines.  They must be the same.
+if test "$NM_LINES" != "$DM_LINES"; then
+    die "$NM_OUTPUT and $DM_OUTPUT don't have the same numbers of lines"
+fi
+
+# Check if mangled symbols exist.  They must not exist.
+if grep --quiet '^_Z' "$DM_OUTPUT"; then
+    MANGLED=`grep '^_Z' "$DM_OUTPUT" | wc -l | awk '{ print \$1 }'`
+    echo "Mangled symbols ($MANGLED out of $NM_LINES) found in $DM_OUTPUT:"
+    grep '^_Z' "$DM_OUTPUT"
+    die "Mangled symbols ($MANGLED out of $NM_LINES) found in $DM_OUTPUT"
+fi
+
+# All C++ symbols are demangled successfully.
+echo "PASS"
+exit 0
diff --git a/src/demangle_unittest.txt b/src/demangle_unittest.txt
new file mode 100644
index 000000000000..07e28bce2f8f
--- /dev/null
+++ b/src/demangle_unittest.txt
@@ -0,0 +1,145 @@
+# Test caces for demangle_unittest.  Each line consists of a
+# tab-separated pair of mangled and demangled symbol names.
+
+# Constructors and destructors.
+_ZN3FooC1Ev	Foo::Foo()
+_ZN3FooD1Ev	Foo::~Foo()
+_ZNSoD0Ev	std::ostream::~ostream()
+
+# G++ extensions.
+_ZTCN10LogMessage9LogStreamE0_So	LogMessage::LogStream
+_ZTv0_n12_N10LogMessage9LogStreamD0Ev	LogMessage::LogStream::~LogStream()
+_ZThn4_N7icu_3_410UnicodeSetD0Ev	icu_3_4::UnicodeSet::~UnicodeSet()
+
+# A bug in g++'s C++ ABI version 2 (-fabi-version=2).
+_ZN7NSSInfoI5groupjjXadL_Z10getgrgid_rEELZ19nss_getgrgid_r_nameEEC1Ei	NSSInfo<>::NSSInfo()
+
+# C linkage symbol names.  Should keep them untouched.
+main	main
+Demangle	Demangle
+_ZERO	_ZERO
+
+# Cast operator.
+_Zcviv	operator int()
+_ZN3foocviEv	foo::operator int()
+
+# Versioned symbols.
+_Z3Foo@GLIBCXX_3.4	Foo@GLIBCXX_3.4
+_Z3Foo@@GLIBCXX_3.4	Foo@@GLIBCXX_3.4
+
+# Abbreviations.
+_ZNSaE	std::allocator
+_ZNSbE	std::basic_string
+_ZNSdE	std::iostream
+_ZNSiE	std::istream
+_ZNSoE	std::ostream
+_ZNSsE	std::string
+
+# Substitutions.  We just replace them with ?.
+_ZN3fooS_E	foo::?
+_ZN3foo3barS0_E	foo::bar::?
+_ZNcvT_IiEEv	operator ?<>()
+
+# "<< <" case.
+_ZlsI3fooE	operator<< <>
+
+# ABI tags.
+_Z1AB3barB3foo	A
+_ZN3fooL3barB5cxx11E	foo::bar
+
+# Random things we found interesting.
+_ZN3FooISt6vectorISsSaISsEEEclEv	Foo<>::operator()()
+_ZTI9Callback1IiE	Callback1<>
+_ZN7icu_3_47UMemorynwEj	icu_3_4::UMemory::operator new()
+_ZNSt6vectorIbE9push_backE	std::vector<>::push_back
+_ZNSt6vectorIbSaIbEE9push_backEb	std::vector<>::push_back()
+_ZlsRSoRK15PRIVATE_Counter	operator<<()
+_ZSt6fill_nIPPN9__gnu_cxx15_Hashtable_nodeISt4pairIKPKcjEEEjS8_ET_SA_T0_RKT1_	std::fill_n<>()
+_ZZ3FoovE3Bar	Foo()::Bar
+_ZGVZ7UpTimervE8up_timer	UpTimer()::up_timer
+
+# Test cases from gcc-4.1.0/libstdc++-v3/testsuite/demangle.
+# Collected by:
+# % grep verify_demangle **/*.cc | perl -nle 'print $1 if /"(_Z.*?)"/' |
+#   sort | uniq
+#
+# Note that the following symbols are invalid.
+# That's why they are not demangled.
+# - _ZNZN1N1fEiE1X1gE
+# - _ZNZN1N1fEiE1X1gEv
+# - _Z1xINiEE
+_Z1fA37_iPS_	f()
+_Z1fAszL_ZZNK1N1A1fEvE3foo_0E_i	f()
+_Z1fI1APS0_PKS0_EvT_T0_T1_PA4_S3_M1CS8_	f<>()
+_Z1fI1XENT_1tES2_	f<>()
+_Z1fI1XEvPVN1AIT_E1TE	f<>()
+_Z1fILi1ELc120EEv1AIXplT_cviLd4028ae147ae147aeEEE	f<>()
+_Z1fILi1ELc120EEv1AIXplT_cviLf3f800000EEE	f<>()
+_Z1fILi5E1AEvN1CIXqugtT_Li0ELi1ELi2EEE1qE	f<>()
+_Z1fILi5E1AEvN1CIXstN1T1tEEXszsrS2_1tEE1qE	f<>()
+_Z1fILi5EEvN1AIXcvimlT_Li22EEE1qE	f<>()
+_Z1fIiEvi	f<>()
+_Z1fKPFiiE	f()
+_Z1fM1AFivEPS0_	f()
+_Z1fM1AKFivE	f()
+_Z1fM1AKFvvE	f()
+_Z1fPFPA1_ivE	f()
+_Z1fPFYPFiiEiE	f()
+_Z1fPFvvEM1SFvvE	f()
+_Z1fPKM1AFivE	f()
+_Z1fi	f()
+_Z1fv	f()
+_Z1jM1AFivEPS1_	j()
+_Z1rM1GFivEMS_KFivES_M1HFivES1_4whatIKS_E5what2IS8_ES3_	r()
+_Z1sPA37_iPS0_	s()
+_Z1xINiEE	_Z1xINiEE
+_Z3absILi11EEvv	abs<>()
+_Z3foo3bar	foo()
+_Z3foo5Hello5WorldS0_S_	foo()
+_Z3fooA30_A_i	foo()
+_Z3fooIA6_KiEvA9_KT_rVPrS4_	foo<>()
+_Z3fooILi2EEvRAplT_Li1E_i	foo<>()
+_Z3fooIiFvdEiEvv	foo<>()
+_Z3fooPM2ABi	foo()
+_Z3fooc	foo()
+_Z3fooiPiPS_PS0_PS1_PS2_PS3_PS4_PS5_PS6_PS7_PS8_PS9_PSA_PSB_PSC_	foo()
+_Z3kooPA28_A30_i	koo()
+_Z4makeI7FactoryiET_IT0_Ev	make<>()
+_Z5firstI3DuoEvS0_	first<>()
+_Z5firstI3DuoEvT_	first<>()
+_Z9hairyfuncM1YKFPVPFrPA2_PM1XKFKPA3_ilEPcEiE	hairyfunc()
+_ZGVN5libcw24_GLOBAL__N_cbll.cc0ZhUKa23compiler_bug_workaroundISt6vectorINS_13omanip_id_tctINS_5debug32memblk_types_manipulator_data_ctEEESaIS6_EEE3idsE	libcw::(anonymous namespace)::compiler_bug_workaround<>::ids
+_ZN12libcw_app_ct10add_optionIS_EEvMT_FvPKcES3_cS3_S3_	libcw_app_ct::add_option<>()
+_ZN1AIfEcvT_IiEEv	A<>::operator ?<>()
+_ZN1N1TIiiE2mfES0_IddE	N::T<>::mf()
+_ZN1N1fE	N::f
+_ZN1f1fE	f::f
+_ZN3FooIA4_iE3barE	Foo<>::bar
+_ZN5Arena5levelE	Arena::level
+_ZN5StackIiiE5levelE	Stack<>::level
+_ZN5libcw5debug13cwprint_usingINS_9_private_12GlobalObjectEEENS0_17cwprint_using_tctIT_EERKS5_MS5_KFvRSt7ostreamE	libcw::debug::cwprint_using<>()
+_ZN6System5Sound4beepEv	System::Sound::beep()
+_ZNKSt14priority_queueIP27timer_event_request_base_ctSt5dequeIS1_SaIS1_EE13timer_greaterE3topEv	std::priority_queue<>::top()
+_ZNKSt15_Deque_iteratorIP15memory_block_stRKS1_PS2_EeqERKS5_	std::_Deque_iterator<>::operator==()
+_ZNKSt17__normal_iteratorIPK6optionSt6vectorIS0_SaIS0_EEEmiERKS6_	std::__normal_iterator<>::operator-()
+_ZNSbIcSt11char_traitsIcEN5libcw5debug27no_alloc_checking_allocatorEE12_S_constructIPcEES6_T_S7_RKS3_	std::basic_string<>::_S_construct<>()
+_ZNSt13_Alloc_traitsISbIcSt18string_char_traitsIcEN5libcw5debug9_private_17allocator_adaptorIcSt24__default_alloc_templateILb0ELi327664EELb1EEEENS5_IS9_S7_Lb1EEEE15_S_instancelessE	std::_Alloc_traits<>::_S_instanceless
+_ZNSt3_In4wardE	std::_In::ward
+_ZNZN1N1fEiE1X1gE	_ZNZN1N1fEiE1X1gE
+_ZNZN1N1fEiE1X1gEv	_ZNZN1N1fEiE1X1gEv
+_ZSt1BISt1DIP1ARKS2_PS3_ES0_IS2_RS2_PS2_ES2_ET0_T_SB_SA_PT1_	std::B<>()
+_ZSt5state	std::state
+_ZTI7a_class	a_class
+_ZZN1N1fEiE1p	N::f()::p
+_ZZN1N1fEiEs	N::f()
+_ZlsRK1XS1_	operator<<()
+_ZlsRKU3fooU4bart1XS0_	operator<<()
+_ZlsRKU3fooU4bart1XS2_	operator<<()
+_ZlsRSoRKSs	operator<<()
+_ZngILi42EEvN1AIXplT_Li2EEE1TE	operator-<>()
+_ZplR1XS0_	operator+()
+_Zrm1XS_	operator%()
+
+# Template argument packs can start with I or J.
+_Z3addIIiEEvDpT_	add<>()
+_Z3addIJiEEvDpT_	add<>()
diff --git a/src/glog/log_severity.h b/src/glog/log_severity.h
new file mode 100644
index 000000000000..987cc57dae91
--- /dev/null
+++ b/src/glog/log_severity.h
@@ -0,0 +1,107 @@
+// Copyright (c) 2007, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef BASE_LOG_SEVERITY_H__
+#define BASE_LOG_SEVERITY_H__
+
+// The recommended semantics of the log levels are as follows:
+//
+// INFO:
+//   Use for state changes or other major events, or to aid debugging.
+// WARNING:
+//   Use for undesired but relatively expected events, which may indicate a
+//   problem
+// ERROR:
+//   Use for undesired and unexpected events that the program can recover from.
+//   All ERRORs should be actionable - it should be appropriate to file a bug
+//   whenever an ERROR occurs in production.
+// FATAL:
+//   Use for undesired and unexpected events that the program cannot recover
+//   from. 
+
+// Annoying stuff for windows -- makes sure clients can import these functions
+#ifndef GOOGLE_GLOG_DLL_DECL
+# if defined(_WIN32) && !defined(__CYGWIN__)
+#   define GOOGLE_GLOG_DLL_DECL  __declspec(dllimport)
+# else
+#   define GOOGLE_GLOG_DLL_DECL
+# endif
+#endif
+
+// Variables of type LogSeverity are widely taken to lie in the range
+// [0, NUM_SEVERITIES-1].  Be careful to preserve this assumption if
+// you ever need to change their values or add a new severity.
+typedef int LogSeverity;
+
+const int GLOG_INFO = 0, GLOG_WARNING = 1, GLOG_ERROR = 2, GLOG_FATAL = 3,
+  NUM_SEVERITIES = 4;
+#ifndef GLOG_NO_ABBREVIATED_SEVERITIES
+# ifdef ERROR
+#  error ERROR macro is defined. Define GLOG_NO_ABBREVIATED_SEVERITIES before including logging.h. See the document for detail.
+# endif
+const int INFO = GLOG_INFO, WARNING = GLOG_WARNING,
+  ERROR = GLOG_ERROR, FATAL = GLOG_FATAL;
+#endif
+
+// DFATAL is FATAL in debug mode, ERROR in normal mode
+#ifdef NDEBUG
+#define DFATAL_LEVEL ERROR
+#else
+#define DFATAL_LEVEL FATAL
+#endif
+
+extern GOOGLE_GLOG_DLL_DECL const char* const LogSeverityNames[NUM_SEVERITIES];
+
+// NDEBUG usage helpers related to (RAW_)DCHECK:
+//
+// DEBUG_MODE is for small !NDEBUG uses like
+//   if (DEBUG_MODE) foo.CheckThatFoo();
+// instead of substantially more verbose
+//   #ifndef NDEBUG
+//     foo.CheckThatFoo();
+//   #endif
+//
+// IF_DEBUG_MODE is for small !NDEBUG uses like
+//   IF_DEBUG_MODE( string error; )
+//   DCHECK(Foo(&error)) << error;
+// instead of substantially more verbose
+//   #ifndef NDEBUG
+//     string error;
+//     DCHECK(Foo(&error)) << error;
+//   #endif
+//
+#ifdef NDEBUG
+enum { DEBUG_MODE = 0 };
+#define IF_DEBUG_MODE(x)
+#else
+enum { DEBUG_MODE = 1 };
+#define IF_DEBUG_MODE(x) x
+#endif
+
+#endif  // BASE_LOG_SEVERITY_H__
diff --git a/src/glog/logging.h.in b/src/glog/logging.h.in
new file mode 100644
index 000000000000..1e552fc1a177
--- /dev/null
+++ b/src/glog/logging.h.in
@@ -0,0 +1,1689 @@
+// Copyright (c) 1999, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Author: Ray Sidney
+//
+// This file contains #include information about logging-related stuff.
+// Pretty much everybody needs to #include this file so that they can
+// log various happenings.
+//
+#ifndef _LOGGING_H_
+#define _LOGGING_H_
+
+#include <errno.h>
+#include <string.h>
+#include <time.h>
+#include <iosfwd>
+#include <ostream>
+#include <sstream>
+#include <string>
+#if @ac_cv_have_unistd_h@
+# include <unistd.h>
+#endif
+#include <vector>
+
+#if defined(_MSC_VER)
+#define GLOG_MSVC_PUSH_DISABLE_WARNING(n) __pragma(warning(push)) \
+                                     __pragma(warning(disable:n))
+#define GLOG_MSVC_POP_WARNING() __pragma(warning(pop))
+#else
+#define GLOG_MSVC_PUSH_DISABLE_WARNING(n)
+#define GLOG_MSVC_POP_WARNING()
+#endif
+
+// Annoying stuff for windows -- makes sure clients can import these functions
+#ifndef GOOGLE_GLOG_DLL_DECL
+# if defined(_WIN32) && !defined(__CYGWIN__)
+#   define GOOGLE_GLOG_DLL_DECL  __declspec(dllimport)
+# else
+#   define GOOGLE_GLOG_DLL_DECL
+# endif
+#endif
+
+// We care a lot about number of bits things take up.  Unfortunately,
+// systems define their bit-specific ints in a lot of different ways.
+// We use our own way, and have a typedef to get there.
+// Note: these commands below may look like "#if 1" or "#if 0", but
+// that's because they were constructed that way at ./configure time.
+// Look at logging.h.in to see how they're calculated (based on your config).
+#if @ac_cv_have_stdint_h@
+#include <stdint.h>             // the normal place uint16_t is defined
+#endif
+#if @ac_cv_have_systypes_h@
+#include <sys/types.h>          // the normal place u_int16_t is defined
+#endif
+#if @ac_cv_have_inttypes_h@
+#include <inttypes.h>           // a third place for uint16_t or u_int16_t
+#endif
+
+#if @ac_cv_have_libgflags@
+#include <gflags/gflags.h>
+#endif
+
+@ac_google_start_namespace@
+
+#if @ac_cv_have_uint16_t@      // the C99 format
+typedef int32_t int32;
+typedef uint32_t uint32;
+typedef int64_t int64;
+typedef uint64_t uint64;
+#elif @ac_cv_have_u_int16_t@   // the BSD format
+typedef int32_t int32;
+typedef u_int32_t uint32;
+typedef int64_t int64;
+typedef u_int64_t uint64;
+#elif @ac_cv_have___uint16@    // the windows (vc7) format
+typedef __int32 int32;
+typedef unsigned __int32 uint32;
+typedef __int64 int64;
+typedef unsigned __int64 uint64;
+#else
+#error Do not know how to define a 32-bit integer quantity on your system
+#endif
+
+@ac_google_end_namespace@
+
+// The global value of GOOGLE_STRIP_LOG. All the messages logged to
+// LOG(XXX) with severity less than GOOGLE_STRIP_LOG will not be displayed.
+// If it can be determined at compile time that the message will not be
+// printed, the statement will be compiled out.
+//
+// Example: to strip out all INFO and WARNING messages, use the value
+// of 2 below. To make an exception for WARNING messages from a single
+// file, add "#define GOOGLE_STRIP_LOG 1" to that file _before_ including
+// base/logging.h
+#ifndef GOOGLE_STRIP_LOG
+#define GOOGLE_STRIP_LOG 0
+#endif
+
+// GCC can be told that a certain branch is not likely to be taken (for
+// instance, a CHECK failure), and use that information in static analysis.
+// Giving it this information can help it optimize for the common case in
+// the absence of better information (ie. -fprofile-arcs).
+//
+#ifndef GOOGLE_PREDICT_BRANCH_NOT_TAKEN
+#if @ac_cv_have___builtin_expect@
+#define GOOGLE_PREDICT_BRANCH_NOT_TAKEN(x) (__builtin_expect(x, 0))
+#else
+#define GOOGLE_PREDICT_BRANCH_NOT_TAKEN(x) x
+#endif
+#endif
+
+#ifndef GOOGLE_PREDICT_FALSE
+#if @ac_cv_have___builtin_expect@
+#define GOOGLE_PREDICT_FALSE(x) (__builtin_expect(x, 0))
+#else
+#define GOOGLE_PREDICT_FALSE(x) x
+#endif
+#endif
+
+#ifndef GOOGLE_PREDICT_TRUE
+#if @ac_cv_have___builtin_expect@
+#define GOOGLE_PREDICT_TRUE(x) (__builtin_expect(!!(x), 1))
+#else
+#define GOOGLE_PREDICT_TRUE(x) x
+#endif
+#endif
+
+
+// Make a bunch of macros for logging.  The way to log things is to stream
+// things to LOG(<a particular severity level>).  E.g.,
+//
+//   LOG(INFO) << "Found " << num_cookies << " cookies";
+//
+// You can capture log messages in a string, rather than reporting them
+// immediately:
+//
+//   vector<string> errors;
+//   LOG_STRING(ERROR, &errors) << "Couldn't parse cookie #" << cookie_num;
+//
+// This pushes back the new error onto 'errors'; if given a NULL pointer,
+// it reports the error via LOG(ERROR).
+//
+// You can also do conditional logging:
+//
+//   LOG_IF(INFO, num_cookies > 10) << "Got lots of cookies";
+//
+// You can also do occasional logging (log every n'th occurrence of an
+// event):
+//
+//   LOG_EVERY_N(INFO, 10) << "Got the " << google::COUNTER << "th cookie";
+//
+// The above will cause log messages to be output on the 1st, 11th, 21st, ...
+// times it is executed.  Note that the special google::COUNTER value is used
+// to identify which repetition is happening.
+//
+// You can also do occasional conditional logging (log every n'th
+// occurrence of an event, when condition is satisfied):
+//
+//   LOG_IF_EVERY_N(INFO, (size > 1024), 10) << "Got the " << google::COUNTER
+//                                           << "th big cookie";
+//
+// You can log messages the first N times your code executes a line. E.g.
+//
+//   LOG_FIRST_N(INFO, 20) << "Got the " << google::COUNTER << "th cookie";
+//
+// Outputs log messages for the first 20 times it is executed.
+//
+// Analogous SYSLOG, SYSLOG_IF, and SYSLOG_EVERY_N macros are available.
+// These log to syslog as well as to the normal logs.  If you use these at
+// all, you need to be aware that syslog can drastically reduce performance,
+// especially if it is configured for remote logging!  Don't use these
+// unless you fully understand this and have a concrete need to use them.
+// Even then, try to minimize your use of them.
+//
+// There are also "debug mode" logging macros like the ones above:
+//
+//   DLOG(INFO) << "Found cookies";
+//
+//   DLOG_IF(INFO, num_cookies > 10) << "Got lots of cookies";
+//
+//   DLOG_EVERY_N(INFO, 10) << "Got the " << google::COUNTER << "th cookie";
+//
+// All "debug mode" logging is compiled away to nothing for non-debug mode
+// compiles.
+//
+// We also have
+//
+//   LOG_ASSERT(assertion);
+//   DLOG_ASSERT(assertion);
+//
+// which is syntactic sugar for {,D}LOG_IF(FATAL, assert fails) << assertion;
+//
+// There are "verbose level" logging macros.  They look like
+//
+//   VLOG(1) << "I'm printed when you run the program with --v=1 or more";
+//   VLOG(2) << "I'm printed when you run the program with --v=2 or more";
+//
+// These always log at the INFO log level (when they log at all).
+// The verbose logging can also be turned on module-by-module.  For instance,
+//    --vmodule=mapreduce=2,file=1,gfs*=3 --v=0
+// will cause:
+//   a. VLOG(2) and lower messages to be printed from mapreduce.{h,cc}
+//   b. VLOG(1) and lower messages to be printed from file.{h,cc}
+//   c. VLOG(3) and lower messages to be printed from files prefixed with "gfs"
+//   d. VLOG(0) and lower messages to be printed from elsewhere
+//
+// The wildcarding functionality shown by (c) supports both '*' (match
+// 0 or more characters) and '?' (match any single character) wildcards.
+//
+// There's also VLOG_IS_ON(n) "verbose level" condition macro. To be used as
+//
+//   if (VLOG_IS_ON(2)) {
+//     // do some logging preparation and logging
+//     // that can't be accomplished with just VLOG(2) << ...;
+//   }
+//
+// There are also VLOG_IF, VLOG_EVERY_N and VLOG_IF_EVERY_N "verbose level"
+// condition macros for sample cases, when some extra computation and
+// preparation for logs is not needed.
+//   VLOG_IF(1, (size > 1024))
+//      << "I'm printed when size is more than 1024 and when you run the "
+//         "program with --v=1 or more";
+//   VLOG_EVERY_N(1, 10)
+//      << "I'm printed every 10th occurrence, and when you run the program "
+//         "with --v=1 or more. Present occurence is " << google::COUNTER;
+//   VLOG_IF_EVERY_N(1, (size > 1024), 10)
+//      << "I'm printed on every 10th occurence of case when size is more "
+//         " than 1024, when you run the program with --v=1 or more. ";
+//         "Present occurence is " << google::COUNTER;
+//
+// The supported severity levels for macros that allow you to specify one
+// are (in increasing order of severity) INFO, WARNING, ERROR, and FATAL.
+// Note that messages of a given severity are logged not only in the
+// logfile for that severity, but also in all logfiles of lower severity.
+// E.g., a message of severity FATAL will be logged to the logfiles of
+// severity FATAL, ERROR, WARNING, and INFO.
+//
+// There is also the special severity of DFATAL, which logs FATAL in
+// debug mode, ERROR in normal mode.
+//
+// Very important: logging a message at the FATAL severity level causes
+// the program to terminate (after the message is logged).
+//
+// Unless otherwise specified, logs will be written to the filename
+// "<program name>.<hostname>.<user name>.log.<severity level>.", followed
+// by the date, time, and pid (you can't prevent the date, time, and pid
+// from being in the filename).
+//
+// The logging code takes two flags:
+//     --v=#           set the verbose level
+//     --logtostderr   log all the messages to stderr instead of to logfiles
+
+// LOG LINE PREFIX FORMAT
+//
+// Log lines have this form:
+//
+//     Lyyyymmdd hh:mm:ss.uuuuuu threadid file:line] msg...
+//
+// where the fields are defined as follows:
+//
+//   L                A single character, representing the log level
+//                    (eg 'I' for INFO)
+//   yyyy             The year
+//   mm               The month (zero padded; ie May is '05')
+//   dd               The day (zero padded)
+//   hh:mm:ss.uuuuuu  Time in hours, minutes and fractional seconds
+//   threadid         The space-padded thread ID as returned by GetTID()
+//                    (this matches the PID on Linux)
+//   file             The file name
+//   line             The line number
+//   msg              The user-supplied message
+//
+// Example:
+//
+//   I1103 11:57:31.739339 24395 google.cc:2341] Command line: ./some_prog
+//   I1103 11:57:31.739403 24395 google.cc:2342] Process id 24395
+//
+// NOTE: although the microseconds are useful for comparing events on
+// a single machine, clocks on different machines may not be well
+// synchronized.  Hence, use caution when comparing the low bits of
+// timestamps from different machines.
+
+#ifndef DECLARE_VARIABLE
+#define MUST_UNDEF_GFLAGS_DECLARE_MACROS
+#define DECLARE_VARIABLE(type, shorttype, name, tn)                     \
+  namespace fL##shorttype {                                             \
+    extern GOOGLE_GLOG_DLL_DECL type FLAGS_##name;                      \
+  }                                                                     \
+  using fL##shorttype::FLAGS_##name
+
+// bool specialization
+#define DECLARE_bool(name) \
+  DECLARE_VARIABLE(bool, B, name, bool)
+
+// int32 specialization
+#define DECLARE_int32(name) \
+  DECLARE_VARIABLE(@ac_google_namespace@::int32, I, name, int32)
+
+// Special case for string, because we have to specify the namespace
+// std::string, which doesn't play nicely with our FLAG__namespace hackery.
+#define DECLARE_string(name)                                            \
+  namespace fLS {                                                       \
+    extern GOOGLE_GLOG_DLL_DECL std::string& FLAGS_##name;              \
+  }                                                                     \
+  using fLS::FLAGS_##name
+#endif
+
+// Set whether appending a timestamp to the log file name
+DECLARE_bool(timestamp_in_logfile_name);
+
+// Set whether log messages go to stderr instead of logfiles
+DECLARE_bool(logtostderr);
+
+// Set whether log messages go to stderr in addition to logfiles.
+DECLARE_bool(alsologtostderr);
+
+// Set color messages logged to stderr (if supported by terminal).
+DECLARE_bool(colorlogtostderr);
+
+// Log messages at a level >= this flag are automatically sent to
+// stderr in addition to log files.
+DECLARE_int32(stderrthreshold);
+
+// Set whether the log prefix should be prepended to each line of output.
+DECLARE_bool(log_prefix);
+
+// Log messages at a level <= this flag are buffered.
+// Log messages at a higher level are flushed immediately.
+DECLARE_int32(logbuflevel);
+
+// Sets the maximum number of seconds which logs may be buffered for.
+DECLARE_int32(logbufsecs);
+
+// Log suppression level: messages logged at a lower level than this
+// are suppressed.
+DECLARE_int32(minloglevel);
+
+// If specified, logfiles are written into this directory instead of the
+// default logging directory.
+DECLARE_string(log_dir);
+
+// Set the log file mode.
+DECLARE_int32(logfile_mode);
+
+// Sets the path of the directory into which to put additional links
+// to the log files.
+DECLARE_string(log_link);
+
+DECLARE_int32(v);  // in vlog_is_on.cc
+
+// Sets the maximum log file size (in MB).
+DECLARE_int32(max_log_size);
+
+// Sets whether to avoid logging to the disk if the disk is full.
+DECLARE_bool(stop_logging_if_full_disk);
+
+#ifdef MUST_UNDEF_GFLAGS_DECLARE_MACROS
+#undef MUST_UNDEF_GFLAGS_DECLARE_MACROS
+#undef DECLARE_VARIABLE
+#undef DECLARE_bool
+#undef DECLARE_int32
+#undef DECLARE_string
+#endif
+
+// Log messages below the GOOGLE_STRIP_LOG level will be compiled away for
+// security reasons. See LOG(severtiy) below.
+
+// A few definitions of macros that don't generate much code.  Since
+// LOG(INFO) and its ilk are used all over our code, it's
+// better to have compact code for these operations.
+
+#if GOOGLE_STRIP_LOG == 0
+#define COMPACT_GOOGLE_LOG_INFO @ac_google_namespace@::LogMessage( \
+      __FILE__, __LINE__)
+#define LOG_TO_STRING_INFO(message) @ac_google_namespace@::LogMessage( \
+      __FILE__, __LINE__, @ac_google_namespace@::GLOG_INFO, message)
+#else
+#define COMPACT_GOOGLE_LOG_INFO @ac_google_namespace@::NullStream()
+#define LOG_TO_STRING_INFO(message) @ac_google_namespace@::NullStream()
+#endif
+
+#if GOOGLE_STRIP_LOG <= 1
+#define COMPACT_GOOGLE_LOG_WARNING @ac_google_namespace@::LogMessage( \
+      __FILE__, __LINE__, @ac_google_namespace@::GLOG_WARNING)
+#define LOG_TO_STRING_WARNING(message) @ac_google_namespace@::LogMessage( \
+      __FILE__, __LINE__, @ac_google_namespace@::GLOG_WARNING, message)
+#else
+#define COMPACT_GOOGLE_LOG_WARNING @ac_google_namespace@::NullStream()
+#define LOG_TO_STRING_WARNING(message) @ac_google_namespace@::NullStream()
+#endif
+
+#if GOOGLE_STRIP_LOG <= 2
+#define COMPACT_GOOGLE_LOG_ERROR @ac_google_namespace@::LogMessage( \
+      __FILE__, __LINE__, @ac_google_namespace@::GLOG_ERROR)
+#define LOG_TO_STRING_ERROR(message) @ac_google_namespace@::LogMessage( \
+      __FILE__, __LINE__, @ac_google_namespace@::GLOG_ERROR, message)
+#else
+#define COMPACT_GOOGLE_LOG_ERROR @ac_google_namespace@::NullStream()
+#define LOG_TO_STRING_ERROR(message) @ac_google_namespace@::NullStream()
+#endif
+
+#if GOOGLE_STRIP_LOG <= 3
+#define COMPACT_GOOGLE_LOG_FATAL @ac_google_namespace@::LogMessageFatal( \
+      __FILE__, __LINE__)
+#define LOG_TO_STRING_FATAL(message) @ac_google_namespace@::LogMessage( \
+      __FILE__, __LINE__, @ac_google_namespace@::GLOG_FATAL, message)
+#else
+#define COMPACT_GOOGLE_LOG_FATAL @ac_google_namespace@::NullStreamFatal()
+#define LOG_TO_STRING_FATAL(message) @ac_google_namespace@::NullStreamFatal()
+#endif
+
+#if defined(NDEBUG) && !defined(DCHECK_ALWAYS_ON)
+#define DCHECK_IS_ON() 0
+#else
+#define DCHECK_IS_ON() 1
+#endif
+
+// For DFATAL, we want to use LogMessage (as opposed to
+// LogMessageFatal), to be consistent with the original behavior.
+#if !DCHECK_IS_ON()
+#define COMPACT_GOOGLE_LOG_DFATAL COMPACT_GOOGLE_LOG_ERROR
+#elif GOOGLE_STRIP_LOG <= 3
+#define COMPACT_GOOGLE_LOG_DFATAL @ac_google_namespace@::LogMessage( \
+      __FILE__, __LINE__, @ac_google_namespace@::GLOG_FATAL)
+#else
+#define COMPACT_GOOGLE_LOG_DFATAL @ac_google_namespace@::NullStreamFatal()
+#endif
+
+#define GOOGLE_LOG_INFO(counter) @ac_google_namespace@::LogMessage(__FILE__, __LINE__, @ac_google_namespace@::GLOG_INFO, counter, &@ac_google_namespace@::LogMessage::SendToLog)
+#define SYSLOG_INFO(counter) \
+  @ac_google_namespace@::LogMessage(__FILE__, __LINE__, @ac_google_namespace@::GLOG_INFO, counter, \
+  &@ac_google_namespace@::LogMessage::SendToSyslogAndLog)
+#define GOOGLE_LOG_WARNING(counter)  \
+  @ac_google_namespace@::LogMessage(__FILE__, __LINE__, @ac_google_namespace@::GLOG_WARNING, counter, \
+  &@ac_google_namespace@::LogMessage::SendToLog)
+#define SYSLOG_WARNING(counter)  \
+  @ac_google_namespace@::LogMessage(__FILE__, __LINE__, @ac_google_namespace@::GLOG_WARNING, counter, \
+  &@ac_google_namespace@::LogMessage::SendToSyslogAndLog)
+#define GOOGLE_LOG_ERROR(counter)  \
+  @ac_google_namespace@::LogMessage(__FILE__, __LINE__, @ac_google_namespace@::GLOG_ERROR, counter, \
+  &@ac_google_namespace@::LogMessage::SendToLog)
+#define SYSLOG_ERROR(counter)  \
+  @ac_google_namespace@::LogMessage(__FILE__, __LINE__, @ac_google_namespace@::GLOG_ERROR, counter, \
+  &@ac_google_namespace@::LogMessage::SendToSyslogAndLog)
+#define GOOGLE_LOG_FATAL(counter) \
+  @ac_google_namespace@::LogMessage(__FILE__, __LINE__, @ac_google_namespace@::GLOG_FATAL, counter, \
+  &@ac_google_namespace@::LogMessage::SendToLog)
+#define SYSLOG_FATAL(counter) \
+  @ac_google_namespace@::LogMessage(__FILE__, __LINE__, @ac_google_namespace@::GLOG_FATAL, counter, \
+  &@ac_google_namespace@::LogMessage::SendToSyslogAndLog)
+#define GOOGLE_LOG_DFATAL(counter) \
+  @ac_google_namespace@::LogMessage(__FILE__, __LINE__, @ac_google_namespace@::DFATAL_LEVEL, counter, \
+  &@ac_google_namespace@::LogMessage::SendToLog)
+#define SYSLOG_DFATAL(counter) \
+  @ac_google_namespace@::LogMessage(__FILE__, __LINE__, @ac_google_namespace@::DFATAL_LEVEL, counter, \
+  &@ac_google_namespace@::LogMessage::SendToSyslogAndLog)
+
+#if defined(WIN32) || defined(_WIN32) || defined(__WIN32__) || defined(__CYGWIN__) || defined(__CYGWIN32__)
+// A very useful logging macro to log windows errors:
+#define LOG_SYSRESULT(result) \
+  if (FAILED(HRESULT_FROM_WIN32(result))) { \
+    LPSTR message = NULL; \
+    LPSTR msg = reinterpret_cast<LPSTR>(&message); \
+    DWORD message_length = FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER | \
+                         FORMAT_MESSAGE_FROM_SYSTEM, \
+                         0, result, 0, msg, 100, NULL); \
+    if (message_length > 0) { \
+      @ac_google_namespace@::LogMessage(__FILE__, __LINE__, @ac_google_namespace@::GLOG_ERROR, 0, \
+          &@ac_google_namespace@::LogMessage::SendToLog).stream() \
+          << reinterpret_cast<const char*>(message); \
+      LocalFree(message); \
+    } \
+  }
+#endif
+
+// We use the preprocessor's merging operator, "##", so that, e.g.,
+// LOG(INFO) becomes the token GOOGLE_LOG_INFO.  There's some funny
+// subtle difference between ostream member streaming functions (e.g.,
+// ostream::operator<<(int) and ostream non-member streaming functions
+// (e.g., ::operator<<(ostream&, string&): it turns out that it's
+// impossible to stream something like a string directly to an unnamed
+// ostream. We employ a neat hack by calling the stream() member
+// function of LogMessage which seems to avoid the problem.
+#define LOG(severity) COMPACT_GOOGLE_LOG_ ## severity.stream()
+#define SYSLOG(severity) SYSLOG_ ## severity(0).stream()
+
+@ac_google_start_namespace@
+
+// They need the definitions of integer types.
+#include "glog/log_severity.h"
+#include "glog/vlog_is_on.h"
+
+// Initialize google's logging library. You will see the program name
+// specified by argv0 in log outputs.
+GOOGLE_GLOG_DLL_DECL void InitGoogleLogging(const char* argv0);
+
+// Shutdown google's logging library.
+GOOGLE_GLOG_DLL_DECL void ShutdownGoogleLogging();
+
+// Install a function which will be called after LOG(FATAL).
+GOOGLE_GLOG_DLL_DECL void InstallFailureFunction(void (*fail_func)());
+
+// Enable/Disable old log cleaner.
+GOOGLE_GLOG_DLL_DECL void EnableLogCleaner(int overdue_days);
+GOOGLE_GLOG_DLL_DECL void DisableLogCleaner();
+
+
+class LogSink;  // defined below
+
+// If a non-NULL sink pointer is given, we push this message to that sink.
+// For LOG_TO_SINK we then do normal LOG(severity) logging as well.
+// This is useful for capturing messages and passing/storing them
+// somewhere more specific than the global log of the process.
+// Argument types:
+//   LogSink* sink;
+//   LogSeverity severity;
+// The cast is to disambiguate NULL arguments.
+#define LOG_TO_SINK(sink, severity) \
+  @ac_google_namespace@::LogMessage(                                    \
+      __FILE__, __LINE__,                                               \
+      @ac_google_namespace@::GLOG_ ## severity,                         \
+      static_cast<@ac_google_namespace@::LogSink*>(sink), true).stream()
+#define LOG_TO_SINK_BUT_NOT_TO_LOGFILE(sink, severity)                  \
+  @ac_google_namespace@::LogMessage(                                    \
+      __FILE__, __LINE__,                                               \
+      @ac_google_namespace@::GLOG_ ## severity,                         \
+      static_cast<@ac_google_namespace@::LogSink*>(sink), false).stream()
+
+// If a non-NULL string pointer is given, we write this message to that string.
+// We then do normal LOG(severity) logging as well.
+// This is useful for capturing messages and storing them somewhere more
+// specific than the global log of the process.
+// Argument types:
+//   string* message;
+//   LogSeverity severity;
+// The cast is to disambiguate NULL arguments.
+// NOTE: LOG(severity) expands to LogMessage().stream() for the specified
+// severity.
+#define LOG_TO_STRING(severity, message) \
+  LOG_TO_STRING_##severity(static_cast<string*>(message)).stream()
+
+// If a non-NULL pointer is given, we push the message onto the end
+// of a vector of strings; otherwise, we report it with LOG(severity).
+// This is handy for capturing messages and perhaps passing them back
+// to the caller, rather than reporting them immediately.
+// Argument types:
+//   LogSeverity severity;
+//   vector<string> *outvec;
+// The cast is to disambiguate NULL arguments.
+#define LOG_STRING(severity, outvec) \
+  LOG_TO_STRING_##severity(static_cast<std::vector<std::string>*>(outvec)).stream()
+
+#define LOG_IF(severity, condition) \
+  static_cast<void>(0),             \
+  !(condition) ? (void) 0 : @ac_google_namespace@::LogMessageVoidify() & LOG(severity)
+#define SYSLOG_IF(severity, condition) \
+  static_cast<void>(0),                \
+  !(condition) ? (void) 0 : @ac_google_namespace@::LogMessageVoidify() & SYSLOG(severity)
+
+#define LOG_ASSERT(condition)  \
+  LOG_IF(FATAL, !(condition)) << "Assert failed: " #condition
+#define SYSLOG_ASSERT(condition) \
+  SYSLOG_IF(FATAL, !(condition)) << "Assert failed: " #condition
+
+// CHECK dies with a fatal error if condition is not true.  It is *not*
+// controlled by DCHECK_IS_ON(), so the check will be executed regardless of
+// compilation mode.  Therefore, it is safe to do things like:
+//    CHECK(fp->Write(x) == 4)
+#define CHECK(condition)  \
+      LOG_IF(FATAL, GOOGLE_PREDICT_BRANCH_NOT_TAKEN(!(condition))) \
+             << "Check failed: " #condition " "
+
+// A container for a string pointer which can be evaluated to a bool -
+// true iff the pointer is NULL.
+struct CheckOpString {
+  CheckOpString(std::string* str) : str_(str) { }
+  // No destructor: if str_ is non-NULL, we're about to LOG(FATAL),
+  // so there's no point in cleaning up str_.
+  operator bool() const {
+    return GOOGLE_PREDICT_BRANCH_NOT_TAKEN(str_ != NULL);
+  }
+  std::string* str_;
+};
+
+// Function is overloaded for integral types to allow static const
+// integrals declared in classes and not defined to be used as arguments to
+// CHECK* macros. It's not encouraged though.
+template <class T>
+inline const T&       GetReferenceableValue(const T&           t) { return t; }
+inline char           GetReferenceableValue(char               t) { return t; }
+inline unsigned char  GetReferenceableValue(unsigned char      t) { return t; }
+inline signed char    GetReferenceableValue(signed char        t) { return t; }
+inline short          GetReferenceableValue(short              t) { return t; }
+inline unsigned short GetReferenceableValue(unsigned short     t) { return t; }
+inline int            GetReferenceableValue(int                t) { return t; }
+inline unsigned int   GetReferenceableValue(unsigned int       t) { return t; }
+inline long           GetReferenceableValue(long               t) { return t; }
+inline unsigned long  GetReferenceableValue(unsigned long      t) { return t; }
+inline long long      GetReferenceableValue(long long          t) { return t; }
+inline unsigned long long GetReferenceableValue(unsigned long long t) {
+  return t;
+}
+
+// This is a dummy class to define the following operator.
+struct DummyClassToDefineOperator {};
+
+@ac_google_end_namespace@
+
+// Define global operator<< to declare using ::operator<<.
+// This declaration will allow use to use CHECK macros for user
+// defined classes which have operator<< (e.g., stl_logging.h).
+inline std::ostream& operator<<(
+    std::ostream& out, const google::DummyClassToDefineOperator&) {
+  return out;
+}
+
+@ac_google_start_namespace@
+
+// This formats a value for a failing CHECK_XX statement.  Ordinarily,
+// it uses the definition for operator<<, with a few special cases below.
+template <typename T>
+inline void MakeCheckOpValueString(std::ostream* os, const T& v) {
+  (*os) << v;
+}
+
+// Overrides for char types provide readable values for unprintable
+// characters.
+template <> GOOGLE_GLOG_DLL_DECL
+void MakeCheckOpValueString(std::ostream* os, const char& v);
+template <> GOOGLE_GLOG_DLL_DECL
+void MakeCheckOpValueString(std::ostream* os, const signed char& v);
+template <> GOOGLE_GLOG_DLL_DECL
+void MakeCheckOpValueString(std::ostream* os, const unsigned char& v);
+
+// Build the error message string. Specify no inlining for code size.
+template <typename T1, typename T2>
+std::string* MakeCheckOpString(const T1& v1, const T2& v2, const char* exprtext)
+    @ac_cv___attribute___noinline@;
+
+namespace base {
+namespace internal {
+
+// If "s" is less than base_logging::INFO, returns base_logging::INFO.
+// If "s" is greater than base_logging::FATAL, returns
+// base_logging::ERROR.  Otherwise, returns "s".
+LogSeverity NormalizeSeverity(LogSeverity s);
+
+}  // namespace internal
+
+// A helper class for formatting "expr (V1 vs. V2)" in a CHECK_XX
+// statement.  See MakeCheckOpString for sample usage.  Other
+// approaches were considered: use of a template method (e.g.,
+// base::BuildCheckOpString(exprtext, base::Print<T1>, &v1,
+// base::Print<T2>, &v2), however this approach has complications
+// related to volatile arguments and function-pointer arguments).
+class GOOGLE_GLOG_DLL_DECL CheckOpMessageBuilder {
+ public:
+  // Inserts "exprtext" and " (" to the stream.
+  explicit CheckOpMessageBuilder(const char *exprtext);
+  // Deletes "stream_".
+  ~CheckOpMessageBuilder();
+  // For inserting the first variable.
+  std::ostream* ForVar1() { return stream_; }
+  // For inserting the second variable (adds an intermediate " vs. ").
+  std::ostream* ForVar2();
+  // Get the result (inserts the closing ")").
+  std::string* NewString();
+
+ private:
+  std::ostringstream *stream_;
+};
+
+}  // namespace base
+
+template <typename T1, typename T2>
+std::string* MakeCheckOpString(const T1& v1, const T2& v2, const char* exprtext) {
+  base::CheckOpMessageBuilder comb(exprtext);
+  MakeCheckOpValueString(comb.ForVar1(), v1);
+  MakeCheckOpValueString(comb.ForVar2(), v2);
+  return comb.NewString();
+}
+
+// Helper functions for CHECK_OP macro.
+// The (int, int) specialization works around the issue that the compiler
+// will not instantiate the template version of the function on values of
+// unnamed enum type - see comment below.
+#define DEFINE_CHECK_OP_IMPL(name, op) \
+  template <typename T1, typename T2> \
+  inline std::string* name##Impl(const T1& v1, const T2& v2,    \
+                            const char* exprtext) { \
+    if (GOOGLE_PREDICT_TRUE(v1 op v2)) return NULL; \
+    else return MakeCheckOpString(v1, v2, exprtext); \
+  } \
+  inline std::string* name##Impl(int v1, int v2, const char* exprtext) { \
+    return name##Impl<int, int>(v1, v2, exprtext); \
+  }
+
+// We use the full name Check_EQ, Check_NE, etc. in case the file including
+// base/logging.h provides its own #defines for the simpler names EQ, NE, etc.
+// This happens if, for example, those are used as token names in a
+// yacc grammar.
+DEFINE_CHECK_OP_IMPL(Check_EQ, ==)  // Compilation error with CHECK_EQ(NULL, x)?
+DEFINE_CHECK_OP_IMPL(Check_NE, !=)  // Use CHECK(x == NULL) instead.
+DEFINE_CHECK_OP_IMPL(Check_LE, <=)
+DEFINE_CHECK_OP_IMPL(Check_LT, < )
+DEFINE_CHECK_OP_IMPL(Check_GE, >=)
+DEFINE_CHECK_OP_IMPL(Check_GT, > )
+#undef DEFINE_CHECK_OP_IMPL
+
+// Helper macro for binary operators.
+// Don't use this macro directly in your code, use CHECK_EQ et al below.
+
+#if defined(STATIC_ANALYSIS)
+// Only for static analysis tool to know that it is equivalent to assert
+#define CHECK_OP_LOG(name, op, val1, val2, log) CHECK((val1) op (val2))
+#elif DCHECK_IS_ON()
+// In debug mode, avoid constructing CheckOpStrings if possible,
+// to reduce the overhead of CHECK statments by 2x.
+// Real DCHECK-heavy tests have seen 1.5x speedups.
+
+// The meaning of "string" might be different between now and
+// when this macro gets invoked (e.g., if someone is experimenting
+// with other string implementations that get defined after this
+// file is included).  Save the current meaning now and use it
+// in the macro.
+typedef std::string _Check_string;
+#define CHECK_OP_LOG(name, op, val1, val2, log)                         \
+  while (@ac_google_namespace@::_Check_string* _result =                \
+         @ac_google_namespace@::Check##name##Impl(                      \
+             @ac_google_namespace@::GetReferenceableValue(val1),        \
+             @ac_google_namespace@::GetReferenceableValue(val2),        \
+             #val1 " " #op " " #val2))                                  \
+    log(__FILE__, __LINE__,                                             \
+        @ac_google_namespace@::CheckOpString(_result)).stream()
+#else
+// In optimized mode, use CheckOpString to hint to compiler that
+// the while condition is unlikely.
+#define CHECK_OP_LOG(name, op, val1, val2, log)                         \
+  while (@ac_google_namespace@::CheckOpString _result =                 \
+         @ac_google_namespace@::Check##name##Impl(                      \
+             @ac_google_namespace@::GetReferenceableValue(val1),        \
+             @ac_google_namespace@::GetReferenceableValue(val2),        \
+             #val1 " " #op " " #val2))                                  \
+    log(__FILE__, __LINE__, _result).stream()
+#endif  // STATIC_ANALYSIS, DCHECK_IS_ON()
+
+#if GOOGLE_STRIP_LOG <= 3
+#define CHECK_OP(name, op, val1, val2) \
+  CHECK_OP_LOG(name, op, val1, val2, @ac_google_namespace@::LogMessageFatal)
+#else
+#define CHECK_OP(name, op, val1, val2) \
+  CHECK_OP_LOG(name, op, val1, val2, @ac_google_namespace@::NullStreamFatal)
+#endif // STRIP_LOG <= 3
+
+// Equality/Inequality checks - compare two values, and log a FATAL message
+// including the two values when the result is not as expected.  The values
+// must have operator<<(ostream, ...) defined.
+//
+// You may append to the error message like so:
+//   CHECK_NE(1, 2) << ": The world must be ending!";
+//
+// We are very careful to ensure that each argument is evaluated exactly
+// once, and that anything which is legal to pass as a function argument is
+// legal here.  In particular, the arguments may be temporary expressions
+// which will end up being destroyed at the end of the apparent statement,
+// for example:
+//   CHECK_EQ(string("abc")[1], 'b');
+//
+// WARNING: These don't compile correctly if one of the arguments is a pointer
+// and the other is NULL. To work around this, simply static_cast NULL to the
+// type of the desired pointer.
+
+#define CHECK_EQ(val1, val2) CHECK_OP(_EQ, ==, val1, val2)
+#define CHECK_NE(val1, val2) CHECK_OP(_NE, !=, val1, val2)
+#define CHECK_LE(val1, val2) CHECK_OP(_LE, <=, val1, val2)
+#define CHECK_LT(val1, val2) CHECK_OP(_LT, < , val1, val2)
+#define CHECK_GE(val1, val2) CHECK_OP(_GE, >=, val1, val2)
+#define CHECK_GT(val1, val2) CHECK_OP(_GT, > , val1, val2)
+
+// Check that the input is non NULL.  This very useful in constructor
+// initializer lists.
+
+#define CHECK_NOTNULL(val) \
+  @ac_google_namespace@::CheckNotNull(__FILE__, __LINE__, "'" #val "' Must be non NULL", (val))
+
+// Helper functions for string comparisons.
+// To avoid bloat, the definitions are in logging.cc.
+#define DECLARE_CHECK_STROP_IMPL(func, expected) \
+  GOOGLE_GLOG_DLL_DECL std::string* Check##func##expected##Impl( \
+      const char* s1, const char* s2, const char* names);
+DECLARE_CHECK_STROP_IMPL(strcmp, true)
+DECLARE_CHECK_STROP_IMPL(strcmp, false)
+DECLARE_CHECK_STROP_IMPL(strcasecmp, true)
+DECLARE_CHECK_STROP_IMPL(strcasecmp, false)
+#undef DECLARE_CHECK_STROP_IMPL
+
+// Helper macro for string comparisons.
+// Don't use this macro directly in your code, use CHECK_STREQ et al below.
+#define CHECK_STROP(func, op, expected, s1, s2) \
+  while (@ac_google_namespace@::CheckOpString _result = \
+         @ac_google_namespace@::Check##func##expected##Impl((s1), (s2), \
+                                     #s1 " " #op " " #s2)) \
+    LOG(FATAL) << *_result.str_
+
+
+// String (char*) equality/inequality checks.
+// CASE versions are case-insensitive.
+//
+// Note that "s1" and "s2" may be temporary strings which are destroyed
+// by the compiler at the end of the current "full expression"
+// (e.g. CHECK_STREQ(Foo().c_str(), Bar().c_str())).
+
+#define CHECK_STREQ(s1, s2) CHECK_STROP(strcmp, ==, true, s1, s2)
+#define CHECK_STRNE(s1, s2) CHECK_STROP(strcmp, !=, false, s1, s2)
+#define CHECK_STRCASEEQ(s1, s2) CHECK_STROP(strcasecmp, ==, true, s1, s2)
+#define CHECK_STRCASENE(s1, s2) CHECK_STROP(strcasecmp, !=, false, s1, s2)
+
+#define CHECK_INDEX(I,A) CHECK(I < (sizeof(A)/sizeof(A[0])))
+#define CHECK_BOUND(B,A) CHECK(B <= (sizeof(A)/sizeof(A[0])))
+
+#define CHECK_DOUBLE_EQ(val1, val2)              \
+  do {                                           \
+    CHECK_LE((val1), (val2)+0.000000000000001L); \
+    CHECK_GE((val1), (val2)-0.000000000000001L); \
+  } while (0)
+
+#define CHECK_NEAR(val1, val2, margin)           \
+  do {                                           \
+    CHECK_LE((val1), (val2)+(margin));           \
+    CHECK_GE((val1), (val2)-(margin));           \
+  } while (0)
+
+// perror()..googly style!
+//
+// PLOG() and PLOG_IF() and PCHECK() behave exactly like their LOG* and
+// CHECK equivalents with the addition that they postpend a description
+// of the current state of errno to their output lines.
+
+#define PLOG(severity) GOOGLE_PLOG(severity, 0).stream()
+
+#define GOOGLE_PLOG(severity, counter)  \
+  @ac_google_namespace@::ErrnoLogMessage( \
+      __FILE__, __LINE__, @ac_google_namespace@::GLOG_ ## severity, counter, \
+      &@ac_google_namespace@::LogMessage::SendToLog)
+
+#define PLOG_IF(severity, condition) \
+  static_cast<void>(0),              \
+  !(condition) ? (void) 0 : @ac_google_namespace@::LogMessageVoidify() & PLOG(severity)
+
+// A CHECK() macro that postpends errno if the condition is false. E.g.
+//
+// if (poll(fds, nfds, timeout) == -1) { PCHECK(errno == EINTR); ... }
+#define PCHECK(condition)  \
+      PLOG_IF(FATAL, GOOGLE_PREDICT_BRANCH_NOT_TAKEN(!(condition))) \
+              << "Check failed: " #condition " "
+
+// A CHECK() macro that lets you assert the success of a function that
+// returns -1 and sets errno in case of an error. E.g.
+//
+// CHECK_ERR(mkdir(path, 0700));
+//
+// or
+//
+// int fd = open(filename, flags); CHECK_ERR(fd) << ": open " << filename;
+#define CHECK_ERR(invocation)                                          \
+PLOG_IF(FATAL, GOOGLE_PREDICT_BRANCH_NOT_TAKEN((invocation) == -1))    \
+        << #invocation
+
+// Use macro expansion to create, for each use of LOG_EVERY_N(), static
+// variables with the __LINE__ expansion as part of the variable name.
+#define LOG_EVERY_N_VARNAME(base, line) LOG_EVERY_N_VARNAME_CONCAT(base, line)
+#define LOG_EVERY_N_VARNAME_CONCAT(base, line) base ## line
+
+#define LOG_OCCURRENCES LOG_EVERY_N_VARNAME(occurrences_, __LINE__)
+#define LOG_OCCURRENCES_MOD_N LOG_EVERY_N_VARNAME(occurrences_mod_n_, __LINE__)
+
+#define SOME_KIND_OF_LOG_EVERY_N(severity, n, what_to_do) \
+  static int LOG_OCCURRENCES = 0, LOG_OCCURRENCES_MOD_N = 0; \
+  ++LOG_OCCURRENCES; \
+  if (++LOG_OCCURRENCES_MOD_N > n) LOG_OCCURRENCES_MOD_N -= n; \
+  if (LOG_OCCURRENCES_MOD_N == 1) \
+    @ac_google_namespace@::LogMessage( \
+        __FILE__, __LINE__, @ac_google_namespace@::GLOG_ ## severity, LOG_OCCURRENCES, \
+        &what_to_do).stream()
+
+#define SOME_KIND_OF_LOG_IF_EVERY_N(severity, condition, n, what_to_do) \
+  static int LOG_OCCURRENCES = 0, LOG_OCCURRENCES_MOD_N = 0; \
+  ++LOG_OCCURRENCES; \
+  if (condition && \
+      ((LOG_OCCURRENCES_MOD_N=(LOG_OCCURRENCES_MOD_N + 1) % n) == (1 % n))) \
+    @ac_google_namespace@::LogMessage( \
+        __FILE__, __LINE__, @ac_google_namespace@::GLOG_ ## severity, LOG_OCCURRENCES, \
+                 &what_to_do).stream()
+
+#define SOME_KIND_OF_PLOG_EVERY_N(severity, n, what_to_do) \
+  static int LOG_OCCURRENCES = 0, LOG_OCCURRENCES_MOD_N = 0; \
+  ++LOG_OCCURRENCES; \
+  if (++LOG_OCCURRENCES_MOD_N > n) LOG_OCCURRENCES_MOD_N -= n; \
+  if (LOG_OCCURRENCES_MOD_N == 1) \
+    @ac_google_namespace@::ErrnoLogMessage( \
+        __FILE__, __LINE__, @ac_google_namespace@::GLOG_ ## severity, LOG_OCCURRENCES, \
+        &what_to_do).stream()
+
+#define SOME_KIND_OF_LOG_FIRST_N(severity, n, what_to_do) \
+  static int LOG_OCCURRENCES = 0; \
+  if (LOG_OCCURRENCES <= n) \
+    ++LOG_OCCURRENCES; \
+  if (LOG_OCCURRENCES <= n) \
+    @ac_google_namespace@::LogMessage( \
+        __FILE__, __LINE__, @ac_google_namespace@::GLOG_ ## severity, LOG_OCCURRENCES, \
+        &what_to_do).stream()
+
+namespace glog_internal_namespace_ {
+template <bool>
+struct CompileAssert {
+};
+struct CrashReason;
+
+// Returns true if FailureSignalHandler is installed.
+// Needs to be exported since it's used by the signalhandler_unittest.
+GOOGLE_GLOG_DLL_DECL bool IsFailureSignalHandlerInstalled();
+}  // namespace glog_internal_namespace_
+
+#define LOG_EVERY_N(severity, n)                                        \
+  SOME_KIND_OF_LOG_EVERY_N(severity, (n), @ac_google_namespace@::LogMessage::SendToLog)
+
+#define SYSLOG_EVERY_N(severity, n) \
+  SOME_KIND_OF_LOG_EVERY_N(severity, (n), @ac_google_namespace@::LogMessage::SendToSyslogAndLog)
+
+#define PLOG_EVERY_N(severity, n) \
+  SOME_KIND_OF_PLOG_EVERY_N(severity, (n), @ac_google_namespace@::LogMessage::SendToLog)
+
+#define LOG_FIRST_N(severity, n) \
+  SOME_KIND_OF_LOG_FIRST_N(severity, (n), @ac_google_namespace@::LogMessage::SendToLog)
+
+#define LOG_IF_EVERY_N(severity, condition, n) \
+  SOME_KIND_OF_LOG_IF_EVERY_N(severity, (condition), (n), @ac_google_namespace@::LogMessage::SendToLog)
+
+// We want the special COUNTER value available for LOG_EVERY_X()'ed messages
+enum PRIVATE_Counter {COUNTER};
+
+#ifdef GLOG_NO_ABBREVIATED_SEVERITIES
+// wingdi.h defines ERROR to be 0. When we call LOG(ERROR), it gets
+// substituted with 0, and it expands to COMPACT_GOOGLE_LOG_0. To allow us
+// to keep using this syntax, we define this macro to do the same thing
+// as COMPACT_GOOGLE_LOG_ERROR.
+#define COMPACT_GOOGLE_LOG_0 COMPACT_GOOGLE_LOG_ERROR
+#define SYSLOG_0 SYSLOG_ERROR
+#define LOG_TO_STRING_0 LOG_TO_STRING_ERROR
+// Needed for LOG_IS_ON(ERROR).
+const LogSeverity GLOG_0 = GLOG_ERROR;
+#else
+// Users may include windows.h after logging.h without
+// GLOG_NO_ABBREVIATED_SEVERITIES nor WIN32_LEAN_AND_MEAN.
+// For this case, we cannot detect if ERROR is defined before users
+// actually use ERROR. Let's make an undefined symbol to warn users.
+# define GLOG_ERROR_MSG ERROR_macro_is_defined_Define_GLOG_NO_ABBREVIATED_SEVERITIES_before_including_logging_h_See_the_document_for_detail
+# define COMPACT_GOOGLE_LOG_0 GLOG_ERROR_MSG
+# define SYSLOG_0 GLOG_ERROR_MSG
+# define LOG_TO_STRING_0 GLOG_ERROR_MSG
+# define GLOG_0 GLOG_ERROR_MSG
+#endif
+
+// Plus some debug-logging macros that get compiled to nothing for production
+
+#if DCHECK_IS_ON()
+
+#define DLOG(severity) LOG(severity)
+#define DVLOG(verboselevel) VLOG(verboselevel)
+#define DLOG_IF(severity, condition) LOG_IF(severity, condition)
+#define DLOG_EVERY_N(severity, n) LOG_EVERY_N(severity, n)
+#define DLOG_IF_EVERY_N(severity, condition, n) \
+  LOG_IF_EVERY_N(severity, condition, n)
+#define DLOG_ASSERT(condition) LOG_ASSERT(condition)
+
+// debug-only checking.  executed if DCHECK_IS_ON().
+#define DCHECK(condition) CHECK(condition)
+#define DCHECK_EQ(val1, val2) CHECK_EQ(val1, val2)
+#define DCHECK_NE(val1, val2) CHECK_NE(val1, val2)
+#define DCHECK_LE(val1, val2) CHECK_LE(val1, val2)
+#define DCHECK_LT(val1, val2) CHECK_LT(val1, val2)
+#define DCHECK_GE(val1, val2) CHECK_GE(val1, val2)
+#define DCHECK_GT(val1, val2) CHECK_GT(val1, val2)
+#define DCHECK_NOTNULL(val) CHECK_NOTNULL(val)
+#define DCHECK_STREQ(str1, str2) CHECK_STREQ(str1, str2)
+#define DCHECK_STRCASEEQ(str1, str2) CHECK_STRCASEEQ(str1, str2)
+#define DCHECK_STRNE(str1, str2) CHECK_STRNE(str1, str2)
+#define DCHECK_STRCASENE(str1, str2) CHECK_STRCASENE(str1, str2)
+
+#else  // !DCHECK_IS_ON()
+
+#define DLOG(severity)  \
+  static_cast<void>(0), \
+  true ? (void) 0 : @ac_google_namespace@::LogMessageVoidify() & LOG(severity)
+
+#define DVLOG(verboselevel)             \
+  static_cast<void>(0),                 \
+  (true || !VLOG_IS_ON(verboselevel)) ? \
+      (void) 0 : @ac_google_namespace@::LogMessageVoidify() & LOG(INFO)
+
+#define DLOG_IF(severity, condition) \
+  static_cast<void>(0),              \
+  (true || !(condition)) ? (void) 0 : @ac_google_namespace@::LogMessageVoidify() & LOG(severity)
+
+#define DLOG_EVERY_N(severity, n) \
+  static_cast<void>(0),           \
+  true ? (void) 0 : @ac_google_namespace@::LogMessageVoidify() & LOG(severity)
+
+#define DLOG_IF_EVERY_N(severity, condition, n) \
+  static_cast<void>(0),                         \
+  (true || !(condition))? (void) 0 : @ac_google_namespace@::LogMessageVoidify() & LOG(severity)
+
+#define DLOG_ASSERT(condition) \
+  static_cast<void>(0),        \
+  true ? (void) 0 : LOG_ASSERT(condition)
+
+// MSVC warning C4127: conditional expression is constant
+#define DCHECK(condition) \
+  GLOG_MSVC_PUSH_DISABLE_WARNING(4127) \
+  while (false) \
+    GLOG_MSVC_POP_WARNING() CHECK(condition)
+
+#define DCHECK_EQ(val1, val2) \
+  GLOG_MSVC_PUSH_DISABLE_WARNING(4127) \
+  while (false) \
+    GLOG_MSVC_POP_WARNING() CHECK_EQ(val1, val2)
+
+#define DCHECK_NE(val1, val2) \
+  GLOG_MSVC_PUSH_DISABLE_WARNING(4127) \
+  while (false) \
+    GLOG_MSVC_POP_WARNING() CHECK_NE(val1, val2)
+
+#define DCHECK_LE(val1, val2) \
+  GLOG_MSVC_PUSH_DISABLE_WARNING(4127) \
+  while (false) \
+    GLOG_MSVC_POP_WARNING() CHECK_LE(val1, val2)
+
+#define DCHECK_LT(val1, val2) \
+  GLOG_MSVC_PUSH_DISABLE_WARNING(4127) \
+  while (false) \
+    GLOG_MSVC_POP_WARNING() CHECK_LT(val1, val2)
+
+#define DCHECK_GE(val1, val2) \
+  GLOG_MSVC_PUSH_DISABLE_WARNING(4127) \
+  while (false) \
+    GLOG_MSVC_POP_WARNING() CHECK_GE(val1, val2)
+
+#define DCHECK_GT(val1, val2) \
+  GLOG_MSVC_PUSH_DISABLE_WARNING(4127) \
+  while (false) \
+    GLOG_MSVC_POP_WARNING() CHECK_GT(val1, val2)
+
+// You may see warnings in release mode if you don't use the return
+// value of DCHECK_NOTNULL. Please just use DCHECK for such cases.
+#define DCHECK_NOTNULL(val) (val)
+
+#define DCHECK_STREQ(str1, str2) \
+  GLOG_MSVC_PUSH_DISABLE_WARNING(4127) \
+  while (false) \
+    GLOG_MSVC_POP_WARNING() CHECK_STREQ(str1, str2)
+
+#define DCHECK_STRCASEEQ(str1, str2) \
+  GLOG_MSVC_PUSH_DISABLE_WARNING(4127) \
+  while (false) \
+    GLOG_MSVC_POP_WARNING() CHECK_STRCASEEQ(str1, str2)
+
+#define DCHECK_STRNE(str1, str2) \
+  GLOG_MSVC_PUSH_DISABLE_WARNING(4127) \
+  while (false) \
+    GLOG_MSVC_POP_WARNING() CHECK_STRNE(str1, str2)
+
+#define DCHECK_STRCASENE(str1, str2) \
+  GLOG_MSVC_PUSH_DISABLE_WARNING(4127) \
+  while (false) \
+    GLOG_MSVC_POP_WARNING() CHECK_STRCASENE(str1, str2)
+
+#endif  // DCHECK_IS_ON()
+
+// Log only in verbose mode.
+
+#define VLOG(verboselevel) LOG_IF(INFO, VLOG_IS_ON(verboselevel))
+
+#define VLOG_IF(verboselevel, condition) \
+  LOG_IF(INFO, (condition) && VLOG_IS_ON(verboselevel))
+
+#define VLOG_EVERY_N(verboselevel, n) \
+  LOG_IF_EVERY_N(INFO, VLOG_IS_ON(verboselevel), n)
+
+#define VLOG_IF_EVERY_N(verboselevel, condition, n) \
+  LOG_IF_EVERY_N(INFO, (condition) && VLOG_IS_ON(verboselevel), n)
+
+namespace base_logging {
+
+// LogMessage::LogStream is a std::ostream backed by this streambuf.
+// This class ignores overflow and leaves two bytes at the end of the
+// buffer to allow for a '\n' and '\0'.
+class GOOGLE_GLOG_DLL_DECL LogStreamBuf : public std::streambuf {
+ public:
+  // REQUIREMENTS: "len" must be >= 2 to account for the '\n' and '\0'.
+  LogStreamBuf(char *buf, int len) {
+    setp(buf, buf + len - 2);
+  }
+
+  // This effectively ignores overflow.
+  virtual int_type overflow(int_type ch) {
+    return ch;
+  }
+
+  // Legacy public ostrstream method.
+  size_t pcount() const { return pptr() - pbase(); }
+  char* pbase() const { return std::streambuf::pbase(); }
+};
+
+}  // namespace base_logging
+
+//
+// This class more or less represents a particular log message.  You
+// create an instance of LogMessage and then stream stuff to it.
+// When you finish streaming to it, ~LogMessage is called and the
+// full message gets streamed to the appropriate destination.
+//
+// You shouldn't actually use LogMessage's constructor to log things,
+// though.  You should use the LOG() macro (and variants thereof)
+// above.
+class GOOGLE_GLOG_DLL_DECL LogMessage {
+public:
+  enum {
+    // Passing kNoLogPrefix for the line number disables the
+    // log-message prefix. Useful for using the LogMessage
+    // infrastructure as a printing utility. See also the --log_prefix
+    // flag for controlling the log-message prefix on an
+    // application-wide basis.
+    kNoLogPrefix = -1
+  };
+
+  // LogStream inherit from non-DLL-exported class (std::ostrstream)
+  // and VC++ produces a warning for this situation.
+  // However, MSDN says "C4275 can be ignored in Microsoft Visual C++
+  // 2005 if you are deriving from a type in the Standard C++ Library"
+  // http://msdn.microsoft.com/en-us/library/3tdb471s(VS.80).aspx
+  // Let's just ignore the warning.
+GLOG_MSVC_PUSH_DISABLE_WARNING(4275)
+  class GOOGLE_GLOG_DLL_DECL LogStream : public std::ostream {
+GLOG_MSVC_POP_WARNING()
+  public:
+    LogStream(char *buf, int len, int ctr)
+        : std::ostream(NULL),
+          streambuf_(buf, len),
+          ctr_(ctr),
+          self_(this) {
+      rdbuf(&streambuf_);
+    }
+
+    int ctr() const { return ctr_; }
+    void set_ctr(int ctr) { ctr_ = ctr; }
+    LogStream* self() const { return self_; }
+
+    // Legacy std::streambuf methods.
+    size_t pcount() const { return streambuf_.pcount(); }
+    char* pbase() const { return streambuf_.pbase(); }
+    char* str() const { return pbase(); }
+
+  private:
+    LogStream(const LogStream&);
+    LogStream& operator=(const LogStream&);
+    base_logging::LogStreamBuf streambuf_;
+    int ctr_;  // Counter hack (for the LOG_EVERY_X() macro)
+    LogStream *self_;  // Consistency check hack
+  };
+
+public:
+  // icc 8 requires this typedef to avoid an internal compiler error.
+  typedef void (LogMessage::*SendMethod)();
+
+  LogMessage(const char* file, int line, LogSeverity severity, int ctr,
+             SendMethod send_method);
+
+  // Two special constructors that generate reduced amounts of code at
+  // LOG call sites for common cases.
+
+  // Used for LOG(INFO): Implied are:
+  // severity = INFO, ctr = 0, send_method = &LogMessage::SendToLog.
+  //
+  // Using this constructor instead of the more complex constructor above
+  // saves 19 bytes per call site.
+  LogMessage(const char* file, int line);
+
+  // Used for LOG(severity) where severity != INFO.  Implied
+  // are: ctr = 0, send_method = &LogMessage::SendToLog
+  //
+  // Using this constructor instead of the more complex constructor above
+  // saves 17 bytes per call site.
+  LogMessage(const char* file, int line, LogSeverity severity);
+
+  // Constructor to log this message to a specified sink (if not NULL).
+  // Implied are: ctr = 0, send_method = &LogMessage::SendToSinkAndLog if
+  // also_send_to_log is true, send_method = &LogMessage::SendToSink otherwise.
+  LogMessage(const char* file, int line, LogSeverity severity, LogSink* sink,
+             bool also_send_to_log);
+
+  // Constructor where we also give a vector<string> pointer
+  // for storing the messages (if the pointer is not NULL).
+  // Implied are: ctr = 0, send_method = &LogMessage::SaveOrSendToLog.
+  LogMessage(const char* file, int line, LogSeverity severity,
+             std::vector<std::string>* outvec);
+
+  // Constructor where we also give a string pointer for storing the
+  // message (if the pointer is not NULL).  Implied are: ctr = 0,
+  // send_method = &LogMessage::WriteToStringAndLog.
+  LogMessage(const char* file, int line, LogSeverity severity,
+             std::string* message);
+
+  // A special constructor used for check failures
+  LogMessage(const char* file, int line, const CheckOpString& result);
+
+  ~LogMessage();
+
+  // Flush a buffered message to the sink set in the constructor.  Always
+  // called by the destructor, it may also be called from elsewhere if
+  // needed.  Only the first call is actioned; any later ones are ignored.
+  void Flush();
+
+  // An arbitrary limit on the length of a single log message.  This
+  // is so that streaming can be done more efficiently.
+  static const size_t kMaxLogMessageLen;
+
+  // Theses should not be called directly outside of logging.*,
+  // only passed as SendMethod arguments to other LogMessage methods:
+  void SendToLog();  // Actually dispatch to the logs
+  void SendToSyslogAndLog();  // Actually dispatch to syslog and the logs
+
+  // Call abort() or similar to perform LOG(FATAL) crash.
+  static void @ac_cv___attribute___noreturn@ Fail();
+
+  std::ostream& stream();
+
+  int preserved_errno() const;
+
+  // Must be called without the log_mutex held.  (L < log_mutex)
+  static int64 num_messages(int severity);
+
+  struct LogMessageData;
+
+private:
+  // Fully internal SendMethod cases:
+  void SendToSinkAndLog();  // Send to sink if provided and dispatch to the logs
+  void SendToSink();  // Send to sink if provided, do nothing otherwise.
+
+  // Write to string if provided and dispatch to the logs.
+  void WriteToStringAndLog();
+
+  void SaveOrSendToLog();  // Save to stringvec if provided, else to logs
+
+  void Init(const char* file, int line, LogSeverity severity,
+            void (LogMessage::*send_method)());
+
+  // Used to fill in crash information during LOG(FATAL) failures.
+  void RecordCrashReason(glog_internal_namespace_::CrashReason* reason);
+
+  // Counts of messages sent at each priority:
+  static int64 num_messages_[NUM_SEVERITIES];  // under log_mutex
+
+  // We keep the data in a separate struct so that each instance of
+  // LogMessage uses less stack space.
+  LogMessageData* allocated_;
+  LogMessageData* data_;
+
+  friend class LogDestination;
+
+  LogMessage(const LogMessage&);
+  void operator=(const LogMessage&);
+};
+
+// This class happens to be thread-hostile because all instances share
+// a single data buffer, but since it can only be created just before
+// the process dies, we don't worry so much.
+class GOOGLE_GLOG_DLL_DECL LogMessageFatal : public LogMessage {
+ public:
+  LogMessageFatal(const char* file, int line);
+  LogMessageFatal(const char* file, int line, const CheckOpString& result);
+  @ac_cv___attribute___noreturn@ ~LogMessageFatal();
+};
+
+// A non-macro interface to the log facility; (useful
+// when the logging level is not a compile-time constant).
+inline void LogAtLevel(int const severity, std::string const &msg) {
+  LogMessage(__FILE__, __LINE__, severity).stream() << msg;
+}
+
+// A macro alternative of LogAtLevel. New code may want to use this
+// version since there are two advantages: 1. this version outputs the
+// file name and the line number where this macro is put like other
+// LOG macros, 2. this macro can be used as C++ stream.
+#define LOG_AT_LEVEL(severity) @ac_google_namespace@::LogMessage(__FILE__, __LINE__, severity).stream()
+
+// Check if it's compiled in C++11 mode.
+//
+// GXX_EXPERIMENTAL_CXX0X is defined by gcc and clang up to at least
+// gcc-4.7 and clang-3.1 (2011-12-13).  __cplusplus was defined to 1
+// in gcc before 4.7 (Crosstool 16) and clang before 3.1, but is
+// defined according to the language version in effect thereafter.
+// Microsoft Visual Studio 14 (2015) sets __cplusplus==199711 despite
+// reasonably good C++11 support, so we set LANG_CXX for it and
+// newer versions (_MSC_VER >= 1900).
+#if (defined(__GXX_EXPERIMENTAL_CXX0X__) || __cplusplus >= 201103L || \
+     (defined(_MSC_VER) && _MSC_VER >= 1900)) && !defined(__UCLIBCXX_MAJOR__)
+// Helper for CHECK_NOTNULL().
+//
+// In C++11, all cases can be handled by a single function. Since the value
+// category of the argument is preserved (also for rvalue references),
+// member initializer lists like the one below will compile correctly:
+//
+//   Foo()
+//     : x_(CHECK_NOTNULL(MethodReturningUniquePtr())) {}
+template <typename T>
+T CheckNotNull(const char* file, int line, const char* names, T&& t) {
+ if (t == nullptr) {
+   LogMessageFatal(file, line, new std::string(names));
+ }
+ return std::forward<T>(t);
+}
+
+#else
+
+// A small helper for CHECK_NOTNULL().
+template <typename T>
+T* CheckNotNull(const char *file, int line, const char *names, T* t) {
+  if (t == NULL) {
+    LogMessageFatal(file, line, new std::string(names));
+  }
+  return t;
+}
+#endif
+
+// Allow folks to put a counter in the LOG_EVERY_X()'ed messages. This
+// only works if ostream is a LogStream. If the ostream is not a
+// LogStream you'll get an assert saying as much at runtime.
+GOOGLE_GLOG_DLL_DECL std::ostream& operator<<(std::ostream &os,
+                                              const PRIVATE_Counter&);
+
+
+// Derived class for PLOG*() above.
+class GOOGLE_GLOG_DLL_DECL ErrnoLogMessage : public LogMessage {
+ public:
+
+  ErrnoLogMessage(const char* file, int line, LogSeverity severity, int ctr,
+                  void (LogMessage::*send_method)());
+
+  // Postpends ": strerror(errno) [errno]".
+  ~ErrnoLogMessage();
+
+ private:
+  ErrnoLogMessage(const ErrnoLogMessage&);
+  void operator=(const ErrnoLogMessage&);
+};
+
+
+// This class is used to explicitly ignore values in the conditional
+// logging macros.  This avoids compiler warnings like "value computed
+// is not used" and "statement has no effect".
+
+class GOOGLE_GLOG_DLL_DECL LogMessageVoidify {
+ public:
+  LogMessageVoidify() { }
+  // This has to be an operator with a precedence lower than << but
+  // higher than ?:
+  void operator&(std::ostream&) { }
+};
+
+
+// Flushes all log files that contains messages that are at least of
+// the specified severity level.  Thread-safe.
+GOOGLE_GLOG_DLL_DECL void FlushLogFiles(LogSeverity min_severity);
+
+// Flushes all log files that contains messages that are at least of
+// the specified severity level. Thread-hostile because it ignores
+// locking -- used for catastrophic failures.
+GOOGLE_GLOG_DLL_DECL void FlushLogFilesUnsafe(LogSeverity min_severity);
+
+//
+// Set the destination to which a particular severity level of log
+// messages is sent.  If base_filename is "", it means "don't log this
+// severity".  Thread-safe.
+//
+GOOGLE_GLOG_DLL_DECL void SetLogDestination(LogSeverity severity,
+                                            const char* base_filename);
+
+//
+// Set the basename of the symlink to the latest log file at a given
+// severity.  If symlink_basename is empty, do not make a symlink.  If
+// you don't call this function, the symlink basename is the
+// invocation name of the program.  Thread-safe.
+//
+GOOGLE_GLOG_DLL_DECL void SetLogSymlink(LogSeverity severity,
+                                        const char* symlink_basename);
+
+//
+// Used to send logs to some other kind of destination
+// Users should subclass LogSink and override send to do whatever they want.
+// Implementations must be thread-safe because a shared instance will
+// be called from whichever thread ran the LOG(XXX) line.
+class GOOGLE_GLOG_DLL_DECL LogSink {
+ public:
+  virtual ~LogSink();
+
+  // Sink's logging logic (message_len is such as to exclude '\n' at the end).
+  // This method can't use LOG() or CHECK() as logging system mutex(s) are held
+  // during this call.
+  virtual void send(LogSeverity severity, const char* full_filename,
+                    const char* base_filename, int line,
+                    const struct ::tm* tm_time,
+                    const char* message, size_t message_len, int32 usecs) {
+    send(severity, full_filename, base_filename, line,
+         tm_time, message, message_len);
+  }
+  // This send() signature is obsolete.
+  // New implementations should define this in terms of
+  // the above send() method.
+  virtual void send(LogSeverity severity, const char* full_filename,
+                    const char* base_filename, int line,
+                    const struct ::tm* tm_time,
+                    const char* message, size_t message_len) = 0;
+
+  // Redefine this to implement waiting for
+  // the sink's logging logic to complete.
+  // It will be called after each send() returns,
+  // but before that LogMessage exits or crashes.
+  // By default this function does nothing.
+  // Using this function one can implement complex logic for send()
+  // that itself involves logging; and do all this w/o causing deadlocks and
+  // inconsistent rearrangement of log messages.
+  // E.g. if a LogSink has thread-specific actions, the send() method
+  // can simply add the message to a queue and wake up another thread that
+  // handles real logging while itself making some LOG() calls;
+  // WaitTillSent() can be implemented to wait for that logic to complete.
+  // See our unittest for an example.
+  virtual void WaitTillSent();
+
+  // Returns the normal text output of the log message.
+  // Can be useful to implement send().
+  static std::string ToString(LogSeverity severity, const char* file, int line,
+                              const struct ::tm* tm_time,
+                              const char* message, size_t message_len,
+                              int32 usecs);
+
+  // Obsolete
+  static std::string ToString(LogSeverity severity, const char* file, int line,
+                              const struct ::tm* tm_time,
+                              const char* message, size_t message_len) {
+    return ToString(severity, file, line, tm_time, message, message_len, 0);
+  }
+};
+
+// Add or remove a LogSink as a consumer of logging data.  Thread-safe.
+GOOGLE_GLOG_DLL_DECL void AddLogSink(LogSink *destination);
+GOOGLE_GLOG_DLL_DECL void RemoveLogSink(LogSink *destination);
+
+//
+// Specify an "extension" added to the filename specified via
+// SetLogDestination.  This applies to all severity levels.  It's
+// often used to append the port we're listening on to the logfile
+// name.  Thread-safe.
+//
+GOOGLE_GLOG_DLL_DECL void SetLogFilenameExtension(
+    const char* filename_extension);
+
+//
+// Make it so that all log messages of at least a particular severity
+// are logged to stderr (in addition to logging to the usual log
+// file(s)).  Thread-safe.
+//
+GOOGLE_GLOG_DLL_DECL void SetStderrLogging(LogSeverity min_severity);
+
+//
+// Make it so that all log messages go only to stderr.  Thread-safe.
+//
+GOOGLE_GLOG_DLL_DECL void LogToStderr();
+
+//
+// Make it so that all log messages of at least a particular severity are
+// logged via email to a list of addresses (in addition to logging to the
+// usual log file(s)).  The list of addresses is just a string containing
+// the email addresses to send to (separated by spaces, say).  Thread-safe.
+//
+GOOGLE_GLOG_DLL_DECL void SetEmailLogging(LogSeverity min_severity,
+                                          const char* addresses);
+
+// A simple function that sends email. dest is a commma-separated
+// list of addressess.  Thread-safe.
+GOOGLE_GLOG_DLL_DECL bool SendEmail(const char *dest,
+                                    const char *subject, const char *body);
+
+GOOGLE_GLOG_DLL_DECL const std::vector<std::string>& GetLoggingDirectories();
+
+// For tests only:  Clear the internal [cached] list of logging directories to
+// force a refresh the next time GetLoggingDirectories is called.
+// Thread-hostile.
+void TestOnly_ClearLoggingDirectoriesList();
+
+// Returns a set of existing temporary directories, which will be a
+// subset of the directories returned by GetLogginDirectories().
+// Thread-safe.
+GOOGLE_GLOG_DLL_DECL void GetExistingTempDirectories(
+    std::vector<std::string>* list);
+
+// Print any fatal message again -- useful to call from signal handler
+// so that the last thing in the output is the fatal message.
+// Thread-hostile, but a race is unlikely.
+GOOGLE_GLOG_DLL_DECL void ReprintFatalMessage();
+
+// Truncate a log file that may be the append-only output of multiple
+// processes and hence can't simply be renamed/reopened (typically a
+// stdout/stderr).  If the file "path" is > "limit" bytes, copy the
+// last "keep" bytes to offset 0 and truncate the rest. Since we could
+// be racing with other writers, this approach has the potential to
+// lose very small amounts of data. For security, only follow symlinks
+// if the path is /proc/self/fd/*
+GOOGLE_GLOG_DLL_DECL void TruncateLogFile(const char *path,
+                                          int64 limit, int64 keep);
+
+// Truncate stdout and stderr if they are over the value specified by
+// --max_log_size; keep the final 1MB.  This function has the same
+// race condition as TruncateLogFile.
+GOOGLE_GLOG_DLL_DECL void TruncateStdoutStderr();
+
+// Return the string representation of the provided LogSeverity level.
+// Thread-safe.
+GOOGLE_GLOG_DLL_DECL const char* GetLogSeverityName(LogSeverity severity);
+
+// ---------------------------------------------------------------------
+// Implementation details that are not useful to most clients
+// ---------------------------------------------------------------------
+
+// A Logger is the interface used by logging modules to emit entries
+// to a log.  A typical implementation will dump formatted data to a
+// sequence of files.  We also provide interfaces that will forward
+// the data to another thread so that the invoker never blocks.
+// Implementations should be thread-safe since the logging system
+// will write to them from multiple threads.
+
+namespace base {
+
+class GOOGLE_GLOG_DLL_DECL Logger {
+ public:
+  virtual ~Logger();
+
+  // Writes "message[0,message_len-1]" corresponding to an event that
+  // occurred at "timestamp".  If "force_flush" is true, the log file
+  // is flushed immediately.
+  //
+  // The input message has already been formatted as deemed
+  // appropriate by the higher level logging facility.  For example,
+  // textual log messages already contain timestamps, and the
+  // file:linenumber header.
+  virtual void Write(bool force_flush,
+                     time_t timestamp,
+                     const char* message,
+                     int message_len) = 0;
+
+  // Flush any buffered messages
+  virtual void Flush() = 0;
+
+  // Get the current LOG file size.
+  // The returned value is approximate since some
+  // logged data may not have been flushed to disk yet.
+  virtual uint32 LogSize() = 0;
+};
+
+// Get the logger for the specified severity level.  The logger
+// remains the property of the logging module and should not be
+// deleted by the caller.  Thread-safe.
+extern GOOGLE_GLOG_DLL_DECL Logger* GetLogger(LogSeverity level);
+
+// Set the logger for the specified severity level.  The logger
+// becomes the property of the logging module and should not
+// be deleted by the caller.  Thread-safe.
+extern GOOGLE_GLOG_DLL_DECL void SetLogger(LogSeverity level, Logger* logger);
+
+}
+
+// glibc has traditionally implemented two incompatible versions of
+// strerror_r(). There is a poorly defined convention for picking the
+// version that we want, but it is not clear whether it even works with
+// all versions of glibc.
+// So, instead, we provide this wrapper that automatically detects the
+// version that is in use, and then implements POSIX semantics.
+// N.B. In addition to what POSIX says, we also guarantee that "buf" will
+// be set to an empty string, if this function failed. This means, in most
+// cases, you do not need to check the error code and you can directly
+// use the value of "buf". It will never have an undefined value.
+// DEPRECATED: Use StrError(int) instead.
+GOOGLE_GLOG_DLL_DECL int posix_strerror_r(int err, char *buf, size_t len);
+
+// A thread-safe replacement for strerror(). Returns a string describing the
+// given POSIX error code.
+GOOGLE_GLOG_DLL_DECL std::string StrError(int err);
+
+// A class for which we define operator<<, which does nothing.
+class GOOGLE_GLOG_DLL_DECL NullStream : public LogMessage::LogStream {
+ public:
+  // Initialize the LogStream so the messages can be written somewhere
+  // (they'll never be actually displayed). This will be needed if a
+  // NullStream& is implicitly converted to LogStream&, in which case
+  // the overloaded NullStream::operator<< will not be invoked.
+  NullStream() : LogMessage::LogStream(message_buffer_, 1, 0) { }
+  NullStream(const char* /*file*/, int /*line*/,
+             const CheckOpString& /*result*/) :
+      LogMessage::LogStream(message_buffer_, 1, 0) { }
+  NullStream &stream() { return *this; }
+ private:
+  // A very short buffer for messages (which we discard anyway). This
+  // will be needed if NullStream& converted to LogStream& (e.g. as a
+  // result of a conditional expression).
+  char message_buffer_[2];
+};
+
+// Do nothing. This operator is inline, allowing the message to be
+// compiled away. The message will not be compiled away if we do
+// something like (flag ? LOG(INFO) : LOG(ERROR)) << message; when
+// SKIP_LOG=WARNING. In those cases, NullStream will be implicitly
+// converted to LogStream and the message will be computed and then
+// quietly discarded.
+template<class T>
+inline NullStream& operator<<(NullStream &str, const T &) { return str; }
+
+// Similar to NullStream, but aborts the program (without stack
+// trace), like LogMessageFatal.
+class GOOGLE_GLOG_DLL_DECL NullStreamFatal : public NullStream {
+ public:
+  NullStreamFatal() { }
+  NullStreamFatal(const char* file, int line, const CheckOpString& result) :
+      NullStream(file, line, result) { }
+  @ac_cv___attribute___noreturn@ ~NullStreamFatal() throw () { _exit(1); }
+};
+
+// Install a signal handler that will dump signal information and a stack
+// trace when the program crashes on certain signals.  We'll install the
+// signal handler for the following signals.
+//
+// SIGSEGV, SIGILL, SIGFPE, SIGABRT, SIGBUS, and SIGTERM.
+//
+// By default, the signal handler will write the failure dump to the
+// standard error.  You can customize the destination by installing your
+// own writer function by InstallFailureWriter() below.
+//
+// Note on threading:
+//
+// The function should be called before threads are created, if you want
+// to use the failure signal handler for all threads.  The stack trace
+// will be shown only for the thread that receives the signal.  In other
+// words, stack traces of other threads won't be shown.
+GOOGLE_GLOG_DLL_DECL void InstallFailureSignalHandler();
+
+// Installs a function that is used for writing the failure dump.  "data"
+// is the pointer to the beginning of a message to be written, and "size"
+// is the size of the message.  You should not expect the data is
+// terminated with '\0'.
+GOOGLE_GLOG_DLL_DECL void InstallFailureWriter(
+    void (*writer)(const char* data, int size));
+
+@ac_google_end_namespace@
+
+#endif // _LOGGING_H_
diff --git a/src/glog/raw_logging.h.in b/src/glog/raw_logging.h.in
new file mode 100644
index 000000000000..31b7ed32d9a7
--- /dev/null
+++ b/src/glog/raw_logging.h.in
@@ -0,0 +1,180 @@
+// Copyright (c) 2006, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Author: Maxim Lifantsev
+//
+// Thread-safe logging routines that do not allocate any memory or
+// acquire any locks, and can therefore be used by low-level memory
+// allocation and synchronization code.
+
+#ifndef BASE_RAW_LOGGING_H_
+#define BASE_RAW_LOGGING_H_
+
+#include <time.h>
+
+@ac_google_start_namespace@
+
+#include "glog/log_severity.h"
+#include "glog/vlog_is_on.h"
+
+// Annoying stuff for windows -- makes sure clients can import these functions
+#ifndef GOOGLE_GLOG_DLL_DECL
+# if defined(_WIN32) && !defined(__CYGWIN__)
+#   define GOOGLE_GLOG_DLL_DECL  __declspec(dllimport)
+# else
+#   define GOOGLE_GLOG_DLL_DECL
+# endif
+#endif
+
+// This is similar to LOG(severity) << format... and VLOG(level) << format..,
+// but
+// * it is to be used ONLY by low-level modules that can't use normal LOG()
+// * it is desiged to be a low-level logger that does not allocate any
+//   memory and does not need any locks, hence:
+// * it logs straight and ONLY to STDERR w/o buffering
+// * it uses an explicit format and arguments list
+// * it will silently chop off really long message strings
+// Usage example:
+//   RAW_LOG(ERROR, "Failed foo with %i: %s", status, error);
+//   RAW_VLOG(3, "status is %i", status);
+// These will print an almost standard log lines like this to stderr only:
+//   E20200821 211317 file.cc:123] RAW: Failed foo with 22: bad_file
+//   I20200821 211317 file.cc:142] RAW: status is 20
+#define RAW_LOG(severity, ...) \
+  do { \
+    switch (@ac_google_namespace@::GLOG_ ## severity) {  \
+      case 0: \
+        RAW_LOG_INFO(__VA_ARGS__); \
+        break; \
+      case 1: \
+        RAW_LOG_WARNING(__VA_ARGS__); \
+        break; \
+      case 2: \
+        RAW_LOG_ERROR(__VA_ARGS__); \
+        break; \
+      case 3: \
+        RAW_LOG_FATAL(__VA_ARGS__); \
+        break; \
+      default: \
+        break; \
+    } \
+  } while (0)
+
+// The following STRIP_LOG testing is performed in the header file so that it's
+// possible to completely compile out the logging code and the log messages.
+#if STRIP_LOG == 0
+#define RAW_VLOG(verboselevel, ...) \
+  do { \
+    if (VLOG_IS_ON(verboselevel)) { \
+      RAW_LOG_INFO(__VA_ARGS__); \
+    } \
+  } while (0)
+#else
+#define RAW_VLOG(verboselevel, ...) RawLogStub__(0, __VA_ARGS__)
+#endif // STRIP_LOG == 0
+
+#if STRIP_LOG == 0
+#define RAW_LOG_INFO(...) @ac_google_namespace@::RawLog__(@ac_google_namespace@::GLOG_INFO, \
+                                   __FILE__, __LINE__, __VA_ARGS__)
+#else
+#define RAW_LOG_INFO(...) @ac_google_namespace@::RawLogStub__(0, __VA_ARGS__)
+#endif // STRIP_LOG == 0
+
+#if STRIP_LOG <= 1
+#define RAW_LOG_WARNING(...) @ac_google_namespace@::RawLog__(@ac_google_namespace@::GLOG_WARNING,   \
+                                      __FILE__, __LINE__, __VA_ARGS__)
+#else
+#define RAW_LOG_WARNING(...) @ac_google_namespace@::RawLogStub__(0, __VA_ARGS__)
+#endif // STRIP_LOG <= 1
+
+#if STRIP_LOG <= 2
+#define RAW_LOG_ERROR(...) @ac_google_namespace@::RawLog__(@ac_google_namespace@::GLOG_ERROR,       \
+                                    __FILE__, __LINE__, __VA_ARGS__)
+#else
+#define RAW_LOG_ERROR(...) @ac_google_namespace@::RawLogStub__(0, __VA_ARGS__)
+#endif // STRIP_LOG <= 2
+
+#if STRIP_LOG <= 3
+#define RAW_LOG_FATAL(...) @ac_google_namespace@::RawLog__(@ac_google_namespace@::GLOG_FATAL,       \
+                                    __FILE__, __LINE__, __VA_ARGS__)
+#else
+#define RAW_LOG_FATAL(...) \
+  do { \
+    @ac_google_namespace@::RawLogStub__(0, __VA_ARGS__);        \
+    exit(1); \
+  } while (0)
+#endif // STRIP_LOG <= 3
+
+// Similar to CHECK(condition) << message,
+// but for low-level modules: we use only RAW_LOG that does not allocate memory.
+// We do not want to provide args list here to encourage this usage:
+//   if (!cond)  RAW_LOG(FATAL, "foo ...", hard_to_compute_args);
+// so that the args are not computed when not needed.
+#define RAW_CHECK(condition, message)                                   \
+  do {                                                                  \
+    if (!(condition)) {                                                 \
+      RAW_LOG(FATAL, "Check %s failed: %s", #condition, message);       \
+    }                                                                   \
+  } while (0)
+
+// Debug versions of RAW_LOG and RAW_CHECK
+#ifndef NDEBUG
+
+#define RAW_DLOG(severity, ...) RAW_LOG(severity, __VA_ARGS__)
+#define RAW_DCHECK(condition, message) RAW_CHECK(condition, message)
+
+#else  // NDEBUG
+
+#define RAW_DLOG(severity, ...)                                 \
+  while (false)                                                 \
+    RAW_LOG(severity, __VA_ARGS__)
+#define RAW_DCHECK(condition, message) \
+  while (false) \
+    RAW_CHECK(condition, message)
+
+#endif  // NDEBUG
+
+// Stub log function used to work around for unused variable warnings when
+// building with STRIP_LOG > 0.
+static inline void RawLogStub__(int /* ignored */, ...) {
+}
+
+// Helper function to implement RAW_LOG and RAW_VLOG
+// Logs format... at "severity" level, reporting it
+// as called from file:line.
+// This does not allocate memory or acquire locks.
+GOOGLE_GLOG_DLL_DECL void RawLog__(LogSeverity severity,
+                                   const char* file,
+                                   int line,
+                                   const char* format, ...)
+   @ac_cv___attribute___printf_4_5@;
+
+@ac_google_end_namespace@
+
+#endif  // BASE_RAW_LOGGING_H_
diff --git a/src/glog/stl_logging.h.in b/src/glog/stl_logging.h.in
new file mode 100644
index 000000000000..600945d2c22f
--- /dev/null
+++ b/src/glog/stl_logging.h.in
@@ -0,0 +1,220 @@
+// Copyright (c) 2003, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Stream output operators for STL containers; to be used for logging *only*.
+// Inclusion of this file lets you do:
+//
+// list<string> x;
+// LOG(INFO) << "data: " << x;
+// vector<int> v1, v2;
+// CHECK_EQ(v1, v2);
+//
+// If you want to use this header file with hash maps or slist, you
+// need to define macros before including this file:
+//
+// - GLOG_STL_LOGGING_FOR_UNORDERED     - <unordered_map> and <unordered_set>
+// - GLOG_STL_LOGGING_FOR_TR1_UNORDERED - <tr1/unordered_(map|set)>
+// - GLOG_STL_LOGGING_FOR_EXT_HASH      - <ext/hash_(map|set)>
+// - GLOG_STL_LOGGING_FOR_EXT_SLIST     - <ext/slist>
+//
+
+#ifndef UTIL_GTL_STL_LOGGING_INL_H_
+#define UTIL_GTL_STL_LOGGING_INL_H_
+
+#if !@ac_cv_cxx_using_operator@
+# error We do not support stl_logging for this compiler
+#endif
+
+#include <deque>
+#include <list>
+#include <map>
+#include <ostream>
+#include <set>
+#include <utility>
+#include <vector>
+
+#ifdef GLOG_STL_LOGGING_FOR_UNORDERED
+# include <unordered_map>
+# include <unordered_set>
+#endif
+
+#ifdef GLOG_STL_LOGGING_FOR_TR1_UNORDERED
+# include <tr1/unordered_map>
+# include <tr1/unordered_set>
+#endif
+
+#ifdef GLOG_STL_LOGGING_FOR_EXT_HASH
+# include <ext/hash_set>
+# include <ext/hash_map>
+#endif
+#ifdef GLOG_STL_LOGGING_FOR_EXT_SLIST
+# include <ext/slist>
+#endif
+
+// Forward declare these two, and define them after all the container streams
+// operators so that we can recurse from pair -> container -> container -> pair
+// properly.
+template<class First, class Second>
+std::ostream& operator<<(std::ostream& out, const std::pair<First, Second>& p);
+
+@ac_google_start_namespace@
+
+template<class Iter>
+void PrintSequence(std::ostream& out, Iter begin, Iter end);
+
+@ac_google_end_namespace@
+
+#define OUTPUT_TWO_ARG_CONTAINER(Sequence) \
+template<class T1, class T2> \
+inline std::ostream& operator<<(std::ostream& out, \
+                                const Sequence<T1, T2>& seq) { \
+  @ac_google_namespace@::PrintSequence(out, seq.begin(), seq.end()); \
+  return out; \
+}
+
+OUTPUT_TWO_ARG_CONTAINER(std::vector)
+OUTPUT_TWO_ARG_CONTAINER(std::deque)
+OUTPUT_TWO_ARG_CONTAINER(std::list)
+#ifdef GLOG_STL_LOGGING_FOR_EXT_SLIST
+OUTPUT_TWO_ARG_CONTAINER(__gnu_cxx::slist)
+#endif
+
+#undef OUTPUT_TWO_ARG_CONTAINER
+
+#define OUTPUT_THREE_ARG_CONTAINER(Sequence) \
+template<class T1, class T2, class T3> \
+inline std::ostream& operator<<(std::ostream& out, \
+                                const Sequence<T1, T2, T3>& seq) { \
+  @ac_google_namespace@::PrintSequence(out, seq.begin(), seq.end()); \
+  return out; \
+}
+
+OUTPUT_THREE_ARG_CONTAINER(std::set)
+OUTPUT_THREE_ARG_CONTAINER(std::multiset)
+
+#undef OUTPUT_THREE_ARG_CONTAINER
+
+#define OUTPUT_FOUR_ARG_CONTAINER(Sequence) \
+template<class T1, class T2, class T3, class T4> \
+inline std::ostream& operator<<(std::ostream& out, \
+                                const Sequence<T1, T2, T3, T4>& seq) { \
+  @ac_google_namespace@::PrintSequence(out, seq.begin(), seq.end()); \
+  return out; \
+}
+
+OUTPUT_FOUR_ARG_CONTAINER(std::map)
+OUTPUT_FOUR_ARG_CONTAINER(std::multimap)
+#ifdef GLOG_STL_LOGGING_FOR_UNORDERED
+OUTPUT_FOUR_ARG_CONTAINER(std::unordered_set)
+OUTPUT_FOUR_ARG_CONTAINER(std::unordered_multiset)
+#endif
+#ifdef GLOG_STL_LOGGING_FOR_TR1_UNORDERED
+OUTPUT_FOUR_ARG_CONTAINER(std::tr1::unordered_set)
+OUTPUT_FOUR_ARG_CONTAINER(std::tr1::unordered_multiset)
+#endif
+#ifdef GLOG_STL_LOGGING_FOR_EXT_HASH
+OUTPUT_FOUR_ARG_CONTAINER(__gnu_cxx::hash_set)
+OUTPUT_FOUR_ARG_CONTAINER(__gnu_cxx::hash_multiset)
+#endif
+
+#undef OUTPUT_FOUR_ARG_CONTAINER
+
+#define OUTPUT_FIVE_ARG_CONTAINER(Sequence) \
+template<class T1, class T2, class T3, class T4, class T5> \
+inline std::ostream& operator<<(std::ostream& out, \
+                                const Sequence<T1, T2, T3, T4, T5>& seq) { \
+  @ac_google_namespace@::PrintSequence(out, seq.begin(), seq.end()); \
+  return out; \
+}
+
+#ifdef GLOG_STL_LOGGING_FOR_UNORDERED
+OUTPUT_FIVE_ARG_CONTAINER(std::unordered_map)
+OUTPUT_FIVE_ARG_CONTAINER(std::unordered_multimap)
+#endif
+#ifdef GLOG_STL_LOGGING_FOR_TR1_UNORDERED
+OUTPUT_FIVE_ARG_CONTAINER(std::tr1::unordered_map)
+OUTPUT_FIVE_ARG_CONTAINER(std::tr1::unordered_multimap)
+#endif
+#ifdef GLOG_STL_LOGGING_FOR_EXT_HASH
+OUTPUT_FIVE_ARG_CONTAINER(__gnu_cxx::hash_map)
+OUTPUT_FIVE_ARG_CONTAINER(__gnu_cxx::hash_multimap)
+#endif
+
+#undef OUTPUT_FIVE_ARG_CONTAINER
+
+template<class First, class Second>
+inline std::ostream& operator<<(std::ostream& out,
+                                const std::pair<First, Second>& p) {
+  out << '(' << p.first << ", " << p.second << ')';
+  return out;
+}
+
+@ac_google_start_namespace@
+
+template<class Iter>
+inline void PrintSequence(std::ostream& out, Iter begin, Iter end) {
+  // Output at most 100 elements -- appropriate if used for logging.
+  for (int i = 0; begin != end && i < 100; ++i, ++begin) {
+    if (i > 0) out << ' ';
+    out << *begin;
+  }
+  if (begin != end) {
+    out << " ...";
+  }
+}
+
+@ac_google_end_namespace@
+
+// Note that this is technically undefined behavior! We are adding things into
+// the std namespace for a reason though -- we are providing new operations on
+// types which are themselves defined with this namespace. Without this, these
+// operator overloads cannot be found via ADL. If these definitions are not
+// found via ADL, they must be #included before they're used, which requires
+// this header to be included before apparently independent other headers.
+//
+// For example, base/logging.h defines various template functions to implement
+// CHECK_EQ(x, y) and stream x and y into the log in the event the check fails.
+// It does so via the function template MakeCheckOpValueString:
+//   template<class T>
+//   void MakeCheckOpValueString(strstream* ss, const T& v) {
+//     (*ss) << v;
+//   }
+// Because 'glog/logging.h' is included before 'glog/stl_logging.h',
+// subsequent CHECK_EQ(v1, v2) for vector<...> typed variable v1 and v2 can only
+// find these operator definitions via ADL.
+//
+// Even this solution has problems -- it may pull unintended operators into the
+// namespace as well, allowing them to also be found via ADL, and creating code
+// that only works with a particular order of includes. Long term, we need to
+// move all of the *definitions* into namespace std, bet we need to ensure no
+// one references them first. This lets us take that step. We cannot define them
+// in both because that would create ambiguous overloads when both are found.
+namespace std { using ::operator<<; }
+
+#endif  // UTIL_GTL_STL_LOGGING_INL_H_
diff --git a/src/glog/vlog_is_on.h.in b/src/glog/vlog_is_on.h.in
new file mode 100644
index 000000000000..3f4c4a32a8b7
--- /dev/null
+++ b/src/glog/vlog_is_on.h.in
@@ -0,0 +1,129 @@
+// Copyright (c) 1999, 2007, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Author: Ray Sidney and many others
+//
+// Defines the VLOG_IS_ON macro that controls the variable-verbosity
+// conditional logging.
+//
+// It's used by VLOG and VLOG_IF in logging.h
+// and by RAW_VLOG in raw_logging.h to trigger the logging.
+//
+// It can also be used directly e.g. like this:
+//   if (VLOG_IS_ON(2)) {
+//     // do some logging preparation and logging
+//     // that can't be accomplished e.g. via just VLOG(2) << ...;
+//   }
+//
+// The truth value that VLOG_IS_ON(level) returns is determined by 
+// the three verbosity level flags:
+//   --v=<n>  Gives the default maximal active V-logging level;
+//            0 is the default.
+//            Normally positive values are used for V-logging levels.
+//   --vmodule=<str>  Gives the per-module maximal V-logging levels to override
+//                    the value given by --v.
+//                    E.g. "my_module=2,foo*=3" would change the logging level
+//                    for all code in source files "my_module.*" and "foo*.*"
+//                    ("-inl" suffixes are also disregarded for this matching).
+//
+// SetVLOGLevel helper function is provided to do limited dynamic control over
+// V-logging by overriding the per-module settings given via --vmodule flag.
+//
+// CAVEAT: --vmodule functionality is not available in non gcc compilers.
+//
+
+#ifndef BASE_VLOG_IS_ON_H_
+#define BASE_VLOG_IS_ON_H_
+
+#include "glog/log_severity.h"
+
+// Annoying stuff for windows -- makes sure clients can import these functions
+#ifndef GOOGLE_GLOG_DLL_DECL
+# if defined(_WIN32) && !defined(__CYGWIN__)
+#   define GOOGLE_GLOG_DLL_DECL  __declspec(dllimport)
+# else
+#   define GOOGLE_GLOG_DLL_DECL
+# endif
+#endif
+
+#if defined(__GNUC__)
+// We emit an anonymous static int* variable at every VLOG_IS_ON(n) site.
+// (Normally) the first time every VLOG_IS_ON(n) site is hit,
+// we determine what variable will dynamically control logging at this site:
+// it's either FLAGS_v or an appropriate internal variable
+// matching the current source file that represents results of
+// parsing of --vmodule flag and/or SetVLOGLevel calls.
+#define VLOG_IS_ON(verboselevel)                                \
+  __extension__  \
+  ({ static @ac_google_namespace@::int32* vlocal__ = &@ac_google_namespace@::kLogSiteUninitialized;           \
+     @ac_google_namespace@::int32 verbose_level__ = (verboselevel);                    \
+     (*vlocal__ >= verbose_level__) &&                          \
+     ((vlocal__ != &@ac_google_namespace@::kLogSiteUninitialized) ||                   \
+      (@ac_google_namespace@::InitVLOG3__(&vlocal__, &FLAGS_v,                         \
+                   __FILE__, verbose_level__))); })
+#else
+// GNU extensions not available, so we do not support --vmodule.
+// Dynamic value of FLAGS_v always controls the logging level.
+#define VLOG_IS_ON(verboselevel) (FLAGS_v >= (verboselevel))
+#endif
+
+// Set VLOG(_IS_ON) level for module_pattern to log_level.
+// This lets us dynamically control what is normally set by the --vmodule flag.
+// Returns the level that previously applied to module_pattern.
+// NOTE: To change the log level for VLOG(_IS_ON) sites
+//	 that have already executed after/during InitGoogleLogging,
+//	 one needs to supply the exact --vmodule pattern that applied to them.
+//       (If no --vmodule pattern applied to them
+//       the value of FLAGS_v will continue to control them.)
+extern GOOGLE_GLOG_DLL_DECL int SetVLOGLevel(const char* module_pattern,
+                                             int log_level);
+
+// Various declarations needed for VLOG_IS_ON above: =========================
+
+// Special value used to indicate that a VLOG_IS_ON site has not been
+// initialized.  We make this a large value, so the common-case check
+// of "*vlocal__ >= verbose_level__" in VLOG_IS_ON definition
+// passes in such cases and InitVLOG3__ is then triggered.
+extern @ac_google_namespace@::int32 kLogSiteUninitialized;
+
+// Helper routine which determines the logging info for a particalur VLOG site.
+//   site_flag     is the address of the site-local pointer to the controlling
+//                 verbosity level
+//   site_default  is the default to use for *site_flag
+//   fname         is the current source file name
+//   verbose_level is the argument to VLOG_IS_ON
+// We will return the return value for VLOG_IS_ON
+// and if possible set *site_flag appropriately.
+extern GOOGLE_GLOG_DLL_DECL bool InitVLOG3__(
+    @ac_google_namespace@::int32** site_flag,
+    @ac_google_namespace@::int32* site_default,
+    const char* fname,
+    @ac_google_namespace@::int32 verbose_level);
+
+#endif  // BASE_VLOG_IS_ON_H_
diff --git a/src/googletest.h b/src/googletest.h
new file mode 100644
index 000000000000..a9e7795dcae1
--- /dev/null
+++ b/src/googletest.h
@@ -0,0 +1,611 @@
+// Copyright (c) 2009, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Author: Shinichiro Hamaji
+//   (based on googletest: http://code.google.com/p/googletest/)
+
+#ifdef GOOGLETEST_H__
+#error You must not include this file twice.
+#endif
+#define GOOGLETEST_H__
+
+#include "utilities.h"
+
+#include <ctype.h>
+#include <setjmp.h>
+#include <time.h>
+
+#include <map>
+#include <sstream>
+#include <string>
+#include <vector>
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#ifdef HAVE_UNISTD_H
+# include <unistd.h>
+#endif
+
+#include "base/commandlineflags.h"
+
+using std::map;
+using std::string;
+using std::vector;
+
+_START_GOOGLE_NAMESPACE_
+
+extern GOOGLE_GLOG_DLL_DECL void (*g_logging_fail_func)();
+
+_END_GOOGLE_NAMESPACE_
+
+#undef GOOGLE_GLOG_DLL_DECL
+#define GOOGLE_GLOG_DLL_DECL
+
+static inline string GetTempDir() {
+#ifndef OS_WINDOWS
+  return "/tmp";
+#else
+  char tmp[MAX_PATH];
+  GetTempPathA(MAX_PATH, tmp);
+  return tmp;
+#endif
+}
+
+#if defined(OS_WINDOWS) && defined(_MSC_VER) && !defined(TEST_SRC_DIR)
+// The test will run in glog/vsproject/<project name>
+// (e.g., glog/vsproject/logging_unittest).
+static const char TEST_SRC_DIR[] = "../..";
+#elif !defined(TEST_SRC_DIR)
+# warning TEST_SRC_DIR should be defined in config.h
+static const char TEST_SRC_DIR[] = ".";
+#endif
+
+static const uint32_t PTR_TEST_VALUE = 0x12345678;
+
+DEFINE_string(test_tmpdir, GetTempDir(), "Dir we use for temp files");
+DEFINE_string(test_srcdir, TEST_SRC_DIR,
+              "Source-dir root, needed to find glog_unittest_flagfile");
+DEFINE_bool(run_benchmark, false, "If true, run benchmarks");
+#ifdef NDEBUG
+DEFINE_int32(benchmark_iters, 100000000, "Number of iterations per benchmark");
+#else
+DEFINE_int32(benchmark_iters, 100000, "Number of iterations per benchmark");
+#endif
+
+#ifdef HAVE_LIB_GTEST
+# include <gtest/gtest.h>
+// Use our ASSERT_DEATH implementation.
+# undef ASSERT_DEATH
+# undef ASSERT_DEBUG_DEATH
+using testing::InitGoogleTest;
+#else
+
+_START_GOOGLE_NAMESPACE_
+
+void InitGoogleTest(int*, char**);
+
+void InitGoogleTest(int*, char**) {}
+
+// The following is some bare-bones testing infrastructure
+
+#define EXPECT_TRUE(cond)                               \
+  do {                                                  \
+    if (!(cond)) {                                      \
+      fprintf(stderr, "Check failed: %s\n", #cond);     \
+      exit(1);                                          \
+    }                                                   \
+  } while (0)
+
+#define EXPECT_FALSE(cond)  EXPECT_TRUE(!(cond))
+
+#define EXPECT_OP(op, val1, val2)                                       \
+  do {                                                                  \
+    if (!((val1) op (val2))) {                                          \
+      fprintf(stderr, "Check failed: %s %s %s\n", #val1, #op, #val2);   \
+      exit(1);                                                          \
+    }                                                                   \
+  } while (0)
+
+#define EXPECT_EQ(val1, val2)  EXPECT_OP(==, val1, val2)
+#define EXPECT_NE(val1, val2)  EXPECT_OP(!=, val1, val2)
+#define EXPECT_GT(val1, val2)  EXPECT_OP(>, val1, val2)
+#define EXPECT_LT(val1, val2)  EXPECT_OP(<, val1, val2)
+
+#define EXPECT_NAN(arg)                                         \
+  do {                                                          \
+    if (!isnan(arg)) {                                          \
+      fprintf(stderr, "Check failed: isnan(%s)\n", #arg);       \
+      exit(1);                                                  \
+    }                                                           \
+  } while (0)
+
+#define EXPECT_INF(arg)                                         \
+  do {                                                          \
+    if (!isinf(arg)) {                                          \
+      fprintf(stderr, "Check failed: isinf(%s)\n", #arg);       \
+      exit(1);                                                  \
+    }                                                           \
+  } while (0)
+
+#define EXPECT_DOUBLE_EQ(val1, val2)                                    \
+  do {                                                                  \
+    if (((val1) < (val2) - 0.001 || (val1) > (val2) + 0.001)) {         \
+      fprintf(stderr, "Check failed: %s == %s\n", #val1, #val2);        \
+      exit(1);                                                          \
+    }                                                                   \
+  } while (0)
+
+#define EXPECT_STREQ(val1, val2)                                        \
+  do {                                                                  \
+    if (strcmp((val1), (val2)) != 0) {                                  \
+      fprintf(stderr, "Check failed: streq(%s, %s)\n", #val1, #val2);   \
+      exit(1);                                                          \
+    }                                                                   \
+  } while (0)
+
+vector<void (*)()> g_testlist;  // the tests to run
+
+#define TEST(a, b)                                      \
+  struct Test_##a##_##b {                               \
+    Test_##a##_##b() { g_testlist.push_back(&Run); }    \
+    static void Run() { FlagSaver fs; RunTest(); }      \
+    static void RunTest();                              \
+  };                                                    \
+  static Test_##a##_##b g_test_##a##_##b;               \
+  void Test_##a##_##b::RunTest()
+
+
+static inline int RUN_ALL_TESTS() {
+  vector<void (*)()>::const_iterator it;
+  for (it = g_testlist.begin(); it != g_testlist.end(); ++it) {
+    (*it)();
+  }
+  fprintf(stderr, "Passed %d tests\n\nPASS\n", (int)g_testlist.size());
+  return 0;
+}
+
+_END_GOOGLE_NAMESPACE_
+
+#endif  // ! HAVE_LIB_GTEST
+
+_START_GOOGLE_NAMESPACE_
+
+static bool g_called_abort;
+static jmp_buf g_jmp_buf;
+static inline void CalledAbort() {
+  g_called_abort = true;
+  longjmp(g_jmp_buf, 1);
+}
+
+#ifdef OS_WINDOWS
+// TODO(hamaji): Death test somehow doesn't work in Windows.
+#define ASSERT_DEATH(fn, msg)
+#else
+#define ASSERT_DEATH(fn, msg)                                           \
+  do {                                                                  \
+    g_called_abort = false;                                             \
+    /* in logging.cc */                                                 \
+    void (*original_logging_fail_func)() = g_logging_fail_func;         \
+    g_logging_fail_func = &CalledAbort;                                 \
+    if (!setjmp(g_jmp_buf)) fn;                                         \
+    /* set back to their default */                                     \
+    g_logging_fail_func = original_logging_fail_func;                   \
+    if (!g_called_abort) {                                              \
+      fprintf(stderr, "Function didn't die (%s): %s\n", msg, #fn);      \
+      exit(1);                                                          \
+    }                                                                   \
+  } while (0)
+#endif
+
+#ifdef NDEBUG
+#define ASSERT_DEBUG_DEATH(fn, msg)
+#else
+#define ASSERT_DEBUG_DEATH(fn, msg) ASSERT_DEATH(fn, msg)
+#endif  // NDEBUG
+
+// Benchmark tools.
+
+#define BENCHMARK(n) static BenchmarkRegisterer __benchmark_ ## n (#n, &n);
+
+map<string, void (*)(int)> g_benchlist;  // the benchmarks to run
+
+class BenchmarkRegisterer {
+ public:
+  BenchmarkRegisterer(const char* name, void (*function)(int iters)) {
+    EXPECT_TRUE(g_benchlist.insert(std::make_pair(name, function)).second);
+  }
+};
+
+static inline void RunSpecifiedBenchmarks() {
+  if (!FLAGS_run_benchmark) {
+    return;
+  }
+
+  int iter_cnt = FLAGS_benchmark_iters;
+  puts("Benchmark\tTime(ns)\tIterations");
+  for (map<string, void (*)(int)>::const_iterator iter = g_benchlist.begin();
+       iter != g_benchlist.end();
+       ++iter) {
+    clock_t start = clock();
+    iter->second(iter_cnt);
+    double elapsed_ns =
+        ((double)clock() - start) / CLOCKS_PER_SEC * 1000*1000*1000;
+    printf("%s\t%8.2lf\t%10d\n",
+           iter->first.c_str(), elapsed_ns / iter_cnt, iter_cnt);
+  }
+  puts("");
+}
+
+// ----------------------------------------------------------------------
+// Golden file functions
+// ----------------------------------------------------------------------
+
+class CapturedStream {
+ public:
+  CapturedStream(int fd, const string & filename) :
+    fd_(fd),
+    uncaptured_fd_(-1),
+    filename_(filename) {
+    Capture();
+  }
+
+  ~CapturedStream() {
+    if (uncaptured_fd_ != -1) {
+      CHECK(close(uncaptured_fd_) != -1);
+    }
+  }
+
+  // Start redirecting output to a file
+  void Capture() {
+    // Keep original stream for later
+    CHECK(uncaptured_fd_ == -1) << ", Stream " << fd_ << " already captured!";
+    uncaptured_fd_ = dup(fd_);
+    CHECK(uncaptured_fd_ != -1);
+
+    // Open file to save stream to
+    int cap_fd = open(filename_.c_str(),
+                      O_CREAT | O_TRUNC | O_WRONLY,
+                      S_IRUSR | S_IWUSR);
+    CHECK(cap_fd != -1);
+
+    // Send stdout/stderr to this file
+    fflush(NULL);
+    CHECK(dup2(cap_fd, fd_) != -1);
+    CHECK(close(cap_fd) != -1);
+  }
+
+  // Remove output redirection
+  void StopCapture() {
+    // Restore original stream
+    if (uncaptured_fd_ != -1) {
+      fflush(NULL);
+      CHECK(dup2(uncaptured_fd_, fd_) != -1);
+    }
+  }
+
+  const string & filename() const { return filename_; }
+
+ private:
+  int fd_;             // file descriptor being captured
+  int uncaptured_fd_;  // where the stream was originally being sent to
+  string filename_;    // file where stream is being saved
+};
+static CapturedStream * s_captured_streams[STDERR_FILENO+1];
+// Redirect a file descriptor to a file.
+//   fd       - Should be STDOUT_FILENO or STDERR_FILENO
+//   filename - File where output should be stored
+static inline void CaptureTestOutput(int fd, const string & filename) {
+  CHECK((fd == STDOUT_FILENO) || (fd == STDERR_FILENO));
+  CHECK(s_captured_streams[fd] == NULL);
+  s_captured_streams[fd] = new CapturedStream(fd, filename);
+}
+static inline void CaptureTestStderr() {
+  CaptureTestOutput(STDERR_FILENO, FLAGS_test_tmpdir + "/captured.err");
+}
+// Return the size (in bytes) of a file
+static inline size_t GetFileSize(FILE * file) {
+  fseek(file, 0, SEEK_END);
+  return static_cast<size_t>(ftell(file));
+}
+// Read the entire content of a file as a string
+static inline string ReadEntireFile(FILE * file) {
+  const size_t file_size = GetFileSize(file);
+  char * const buffer = new char[file_size];
+
+  size_t bytes_last_read = 0;  // # of bytes read in the last fread()
+  size_t bytes_read = 0;       // # of bytes read so far
+
+  fseek(file, 0, SEEK_SET);
+
+  // Keep reading the file until we cannot read further or the
+  // pre-determined file size is reached.
+  do {
+    bytes_last_read = fread(buffer+bytes_read, 1, file_size-bytes_read, file);
+    bytes_read += bytes_last_read;
+  } while (bytes_last_read > 0 && bytes_read < file_size);
+
+  const string content = string(buffer, buffer+bytes_read);
+  delete[] buffer;
+
+  return content;
+}
+// Get the captured stdout (when fd is STDOUT_FILENO) or stderr (when
+// fd is STDERR_FILENO) as a string
+static inline string GetCapturedTestOutput(int fd) {
+  CHECK(fd == STDOUT_FILENO || fd == STDERR_FILENO);
+  CapturedStream * const cap = s_captured_streams[fd];
+  CHECK(cap)
+    << ": did you forget CaptureTestStdout() or CaptureTestStderr()?";
+
+  // Make sure everything is flushed.
+  cap->StopCapture();
+
+  // Read the captured file.
+  FILE * const file = fopen(cap->filename().c_str(), "r");
+  const string content = ReadEntireFile(file);
+  fclose(file);
+
+  delete cap;
+  s_captured_streams[fd] = NULL;
+
+  return content;
+}
+// Get the captured stderr of a test as a string.
+static inline string GetCapturedTestStderr() {
+  return GetCapturedTestOutput(STDERR_FILENO);
+}
+
+// Check if the string is [IWEF](\d{8}|YEARDATE)
+static inline bool IsLoggingPrefix(const string& s) {
+  if (s.size() != 9) return false;
+  if (!strchr("IWEF", s[0])) return false;
+  for (int i = 1; i <= 8; ++i) {
+    if (!isdigit(s[i]) && s[i] != "YEARDATE"[i-1]) return false;
+  }
+  return true;
+}
+
+// Convert log output into normalized form.
+//
+// Example:
+//     I20200102 030405 logging_unittest.cc:345] RAW: vlog -1
+//  => IYEARDATE TIME__ logging_unittest.cc:LINE] RAW: vlog -1
+static inline string MungeLine(const string& line) {
+  std::istringstream iss(line);
+  string before, logcode_date, time, thread_lineinfo;
+  iss >> logcode_date;
+  while (!IsLoggingPrefix(logcode_date)) {
+    before += " " + logcode_date;
+    if (!(iss >> logcode_date)) {
+      // We cannot find the header of log output.
+      return before;
+    }
+  }
+  if (!before.empty()) before += " ";
+  iss >> time;
+  iss >> thread_lineinfo;
+  CHECK(!thread_lineinfo.empty());
+  if (thread_lineinfo[thread_lineinfo.size() - 1] != ']') {
+    // We found thread ID.
+    string tmp;
+    iss >> tmp;
+    CHECK(!tmp.empty());
+    CHECK_EQ(']', tmp[tmp.size() - 1]);
+    thread_lineinfo = "THREADID " + tmp;
+  }
+  size_t index = thread_lineinfo.find(':');
+  CHECK_NE(string::npos, index);
+  thread_lineinfo = thread_lineinfo.substr(0, index+1) + "LINE]";
+  string rest;
+  std::getline(iss, rest);
+  return (before + logcode_date[0] + "YEARDATE TIME__ " + thread_lineinfo +
+          MungeLine(rest));
+}
+
+static inline void StringReplace(string* str,
+                          const string& oldsub,
+                          const string& newsub) {
+  size_t pos = str->find(oldsub);
+  if (pos != string::npos) {
+    str->replace(pos, oldsub.size(), newsub.c_str());
+  }
+}
+
+static inline string Munge(const string& filename) {
+  FILE* fp = fopen(filename.c_str(), "rb");
+  CHECK(fp != NULL) << filename << ": couldn't open";
+  char buf[4096];
+  string result;
+  while (fgets(buf, 4095, fp)) {
+    string line = MungeLine(buf);
+    char null_str[256];
+    char ptr_str[256];
+    sprintf(null_str, "%p", static_cast<void*>(NULL));
+    sprintf(ptr_str, "%p", reinterpret_cast<void*>(PTR_TEST_VALUE));
+
+    StringReplace(&line, "__NULLP__", null_str);
+    StringReplace(&line, "__PTRTEST__", ptr_str);
+
+    StringReplace(&line, "__SUCCESS__", StrError(0));
+    StringReplace(&line, "__ENOENT__", StrError(ENOENT));
+    StringReplace(&line, "__EINTR__", StrError(EINTR));
+    StringReplace(&line, "__ENXIO__", StrError(ENXIO));
+    StringReplace(&line, "__ENOEXEC__", StrError(ENOEXEC));
+    result += line + "\n";
+  }
+  fclose(fp);
+  return result;
+}
+
+static inline void WriteToFile(const string& body, const string& file) {
+  FILE* fp = fopen(file.c_str(), "wb");
+  fwrite(body.data(), 1, body.size(), fp);
+  fclose(fp);
+}
+
+static inline bool MungeAndDiffTestStderr(const string& golden_filename) {
+  CapturedStream* cap = s_captured_streams[STDERR_FILENO];
+  CHECK(cap) << ": did you forget CaptureTestStderr()?";
+
+  cap->StopCapture();
+
+  // Run munge
+  const string captured = Munge(cap->filename());
+  const string golden = Munge(golden_filename);
+  if (captured != golden) {
+    fprintf(stderr,
+            "Test with golden file failed. We'll try to show the diff:\n");
+    string munged_golden = golden_filename + ".munged";
+    WriteToFile(golden, munged_golden);
+    string munged_captured = cap->filename() + ".munged";
+    WriteToFile(captured, munged_captured);
+#ifdef OS_WINDOWS
+    string diffcmd("fc " + munged_golden + " " + munged_captured);
+#else
+    string diffcmd("diff -u " + munged_golden + " " + munged_captured);
+#endif
+    if (system(diffcmd.c_str()) != 0) {
+      fprintf(stderr, "diff command was failed.\n");
+    }
+    unlink(munged_golden.c_str());
+    unlink(munged_captured.c_str());
+    return false;
+  }
+  LOG(INFO) << "Diff was successful";
+  return true;
+}
+
+// Save flags used from logging_unittest.cc.
+#ifndef HAVE_LIB_GFLAGS
+struct FlagSaver {
+  FlagSaver()
+      : v_(FLAGS_v),
+        stderrthreshold_(FLAGS_stderrthreshold),
+        logtostderr_(FLAGS_logtostderr),
+        alsologtostderr_(FLAGS_alsologtostderr) {}
+  ~FlagSaver() {
+    FLAGS_v = v_;
+    FLAGS_stderrthreshold = stderrthreshold_;
+    FLAGS_logtostderr = logtostderr_;
+    FLAGS_alsologtostderr = alsologtostderr_;
+  }
+  int v_;
+  int stderrthreshold_;
+  bool logtostderr_;
+  bool alsologtostderr_;
+};
+#endif
+
+class Thread {
+ public:
+  virtual ~Thread() {}
+
+  void SetJoinable(bool) {}
+#if defined(OS_WINDOWS) && !defined(OS_CYGWIN)
+  void Start() {
+    handle_ = CreateThread(NULL,
+                           0,
+                           (LPTHREAD_START_ROUTINE)&Thread::InvokeThread,
+                           (LPVOID)this,
+                           0,
+                           &th_);
+    CHECK(handle_) << "CreateThread";
+  }
+  void Join() {
+    WaitForSingleObject(handle_, INFINITE);
+  }
+#elif defined(HAVE_PTHREAD)
+  void Start() {
+    pthread_create(&th_, NULL, &Thread::InvokeThread, this);
+  }
+  void Join() {
+    pthread_join(th_, NULL);
+  }
+#else
+# error No thread implementation.
+#endif
+
+ protected:
+  virtual void Run() = 0;
+
+ private:
+  static void* InvokeThread(void* self) {
+    ((Thread*)self)->Run();
+    return NULL;
+  }
+
+#if defined(OS_WINDOWS) && !defined(OS_CYGWIN)
+  HANDLE handle_;
+  DWORD th_;
+#else
+  pthread_t th_;
+#endif
+};
+
+static inline void SleepForMilliseconds(int t) {
+#ifndef OS_WINDOWS
+# if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE >= 199309L
+  const struct timespec req = {0, t * 1000 * 1000};
+  nanosleep(&req, NULL);
+# else
+  usleep(t * 1000);
+# endif
+#else
+  Sleep(t);
+#endif
+}
+
+// Add hook for operator new to ensure there are no memory allocation.
+
+void (*g_new_hook)() = NULL;
+
+_END_GOOGLE_NAMESPACE_
+
+void* operator new(size_t size) {
+  if (GOOGLE_NAMESPACE::g_new_hook) {
+    GOOGLE_NAMESPACE::g_new_hook();
+  }
+  return malloc(size);
+}
+
+void* operator new[](size_t size) {
+  return ::operator new(size);
+}
+
+void operator delete(void* p) {
+  free(p);
+}
+
+void operator delete[](void* p) {
+  ::operator delete(p);
+}
diff --git a/src/logging.cc b/src/logging.cc
new file mode 100644
index 000000000000..ddcf91007358
--- /dev/null
+++ b/src/logging.cc
@@ -0,0 +1,2344 @@
+// Copyright (c) 1999, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#define _GNU_SOURCE 1 // needed for O_NOFOLLOW and pread()/pwrite()
+
+#include "utilities.h"
+
+#include <algorithm>
+#include <assert.h>
+#include <iomanip>
+#include <string>
+#ifdef HAVE_UNISTD_H
+# include <unistd.h>  // For _exit.
+#endif
+#include <climits>
+#include <sys/types.h>
+#include <sys/stat.h>
+#ifdef HAVE_SYS_UTSNAME_H
+# include <sys/utsname.h>  // For uname.
+#endif
+#include <time.h>
+#include <fcntl.h>
+#include <cstdio>
+#include <iostream>
+#include <stdarg.h>
+#include <stdlib.h>
+#ifdef HAVE_PWD_H
+# include <pwd.h>
+#endif
+#ifdef HAVE_SYSLOG_H
+# include <syslog.h>
+#endif
+#include <vector>
+#include <errno.h>                   // for errno
+#include <sstream>
+#ifdef OS_WINDOWS
+#include "windows/dirent.h"
+#else
+#include <dirent.h> // for automatic removal of old logs
+#endif
+#include "base/commandlineflags.h"        // to get the program name
+#include "glog/logging.h"
+#include "glog/raw_logging.h"
+#include "base/googleinit.h"
+
+#ifdef HAVE_STACKTRACE
+# include "stacktrace.h"
+#endif
+
+using std::string;
+using std::vector;
+using std::setw;
+using std::setfill;
+using std::hex;
+using std::dec;
+using std::min;
+using std::ostream;
+using std::ostringstream;
+
+using std::FILE;
+using std::fwrite;
+using std::fclose;
+using std::fflush;
+using std::fprintf;
+using std::perror;
+
+#ifdef __QNX__
+using std::fdopen;
+#endif
+
+#ifdef _WIN32
+#define fdopen _fdopen
+#endif
+
+// There is no thread annotation support.
+#define EXCLUSIVE_LOCKS_REQUIRED(mu)
+
+static bool BoolFromEnv(const char *varname, bool defval) {
+  const char* const valstr = getenv(varname);
+  if (!valstr) {
+    return defval;
+  }
+  return memchr("tTyY1\0", valstr[0], 6) != NULL;
+}
+
+GLOG_DEFINE_bool(timestamp_in_logfile_name,
+                 BoolFromEnv("GOOGLE_TIMESTAMP_IN_LOGFILE_NAME", true),
+                 "put a timestamp at the end of the log file name");
+GLOG_DEFINE_bool(logtostderr, BoolFromEnv("GOOGLE_LOGTOSTDERR", false),
+                 "log messages go to stderr instead of logfiles");
+GLOG_DEFINE_bool(alsologtostderr, BoolFromEnv("GOOGLE_ALSOLOGTOSTDERR", false),
+                 "log messages go to stderr in addition to logfiles");
+GLOG_DEFINE_bool(colorlogtostderr, false,
+                 "color messages logged to stderr (if supported by terminal)");
+#ifdef OS_LINUX
+GLOG_DEFINE_bool(drop_log_memory, true, "Drop in-memory buffers of log contents. "
+                 "Logs can grow very quickly and they are rarely read before they "
+                 "need to be evicted from memory. Instead, drop them from memory "
+                 "as soon as they are flushed to disk.");
+#endif
+
+// By default, errors (including fatal errors) get logged to stderr as
+// well as the file.
+//
+// The default is ERROR instead of FATAL so that users can see problems
+// when they run a program without having to look in another file.
+DEFINE_int32(stderrthreshold,
+             GOOGLE_NAMESPACE::GLOG_ERROR,
+             "log messages at or above this level are copied to stderr in "
+             "addition to logfiles.  This flag obsoletes --alsologtostderr.");
+
+GLOG_DEFINE_string(alsologtoemail, "",
+                   "log messages go to these email addresses "
+                   "in addition to logfiles");
+GLOG_DEFINE_bool(log_prefix, true,
+                 "Prepend the log prefix to the start of each log line");
+GLOG_DEFINE_int32(minloglevel, 0, "Messages logged at a lower level than this don't "
+                  "actually get logged anywhere");
+GLOG_DEFINE_int32(logbuflevel, 0,
+                  "Buffer log messages logged at this level or lower"
+                  " (-1 means don't buffer; 0 means buffer INFO only;"
+                  " ...)");
+GLOG_DEFINE_int32(logbufsecs, 30,
+                  "Buffer log messages for at most this many seconds");
+GLOG_DEFINE_int32(logemaillevel, 999,
+                  "Email log messages logged at this level or higher"
+                  " (0 means email all; 3 means email FATAL only;"
+                  " ...)");
+GLOG_DEFINE_string(logmailer, "/bin/mail",
+                   "Mailer used to send logging email");
+
+// Compute the default value for --log_dir
+static const char* DefaultLogDir() {
+  const char* env;
+  env = getenv("GOOGLE_LOG_DIR");
+  if (env != NULL && env[0] != '\0') {
+    return env;
+  }
+  env = getenv("TEST_TMPDIR");
+  if (env != NULL && env[0] != '\0') {
+    return env;
+  }
+  return "";
+}
+
+GLOG_DEFINE_int32(logfile_mode, 0664, "Log file mode/permissions.");
+
+GLOG_DEFINE_string(log_dir, DefaultLogDir(),
+                   "If specified, logfiles are written into this directory instead "
+                   "of the default logging directory.");
+GLOG_DEFINE_string(log_link, "", "Put additional links to the log "
+                   "files in this directory");
+
+GLOG_DEFINE_int32(max_log_size, 1800,
+                  "approx. maximum log file size (in MB). A value of 0 will "
+                  "be silently overridden to 1.");
+
+GLOG_DEFINE_bool(stop_logging_if_full_disk, false,
+                 "Stop attempting to log to disk if the disk is full.");
+
+GLOG_DEFINE_string(log_backtrace_at, "",
+                   "Emit a backtrace when logging at file:linenum.");
+
+// TODO(hamaji): consider windows
+#define PATH_SEPARATOR '/'
+
+#ifndef HAVE_PREAD
+#if defined(OS_WINDOWS)
+#include <basetsd.h>
+#define ssize_t SSIZE_T
+#endif
+static ssize_t pread(int fd, void* buf, size_t count, off_t offset) {
+  off_t orig_offset = lseek(fd, 0, SEEK_CUR);
+  if (orig_offset == (off_t)-1)
+    return -1;
+  if (lseek(fd, offset, SEEK_CUR) == (off_t)-1)
+    return -1;
+  ssize_t len = read(fd, buf, count);
+  if (len < 0)
+    return len;
+  if (lseek(fd, orig_offset, SEEK_SET) == (off_t)-1)
+    return -1;
+  return len;
+}
+#endif  // !HAVE_PREAD
+
+#ifndef HAVE_PWRITE
+static ssize_t pwrite(int fd, void* buf, size_t count, off_t offset) {
+  off_t orig_offset = lseek(fd, 0, SEEK_CUR);
+  if (orig_offset == (off_t)-1)
+    return -1;
+  if (lseek(fd, offset, SEEK_CUR) == (off_t)-1)
+    return -1;
+  ssize_t len = write(fd, buf, count);
+  if (len < 0)
+    return len;
+  if (lseek(fd, orig_offset, SEEK_SET) == (off_t)-1)
+    return -1;
+  return len;
+}
+#endif  // !HAVE_PWRITE
+
+static void GetHostName(string* hostname) {
+#if defined(HAVE_SYS_UTSNAME_H)
+  struct utsname buf;
+  if (0 != uname(&buf)) {
+    // ensure null termination on failure
+    *buf.nodename = '\0';
+  }
+  *hostname = buf.nodename;
+#elif defined(OS_WINDOWS)
+  char buf[MAX_COMPUTERNAME_LENGTH + 1];
+  DWORD len = MAX_COMPUTERNAME_LENGTH + 1;
+  if (GetComputerNameA(buf, &len)) {
+    *hostname = buf;
+  } else {
+    hostname->clear();
+  }
+#else
+# warning There is no way to retrieve the host name.
+  *hostname = "(unknown)";
+#endif
+}
+
+// Returns true iff terminal supports using colors in output.
+static bool TerminalSupportsColor() {
+  bool term_supports_color = false;
+#ifdef OS_WINDOWS
+  // on Windows TERM variable is usually not set, but the console does
+  // support colors.
+  term_supports_color = true;
+#else
+  // On non-Windows platforms, we rely on the TERM variable.
+  const char* const term = getenv("TERM");
+  if (term != NULL && term[0] != '\0') {
+    term_supports_color =
+      !strcmp(term, "xterm") ||
+      !strcmp(term, "xterm-color") ||
+      !strcmp(term, "xterm-256color") ||
+      !strcmp(term, "screen-256color") ||
+      !strcmp(term, "konsole") ||
+      !strcmp(term, "konsole-16color") ||
+      !strcmp(term, "konsole-256color") ||
+      !strcmp(term, "screen") ||
+      !strcmp(term, "linux") ||
+      !strcmp(term, "cygwin");
+  }
+#endif
+  return term_supports_color;
+}
+
+_START_GOOGLE_NAMESPACE_
+
+enum GLogColor {
+  COLOR_DEFAULT,
+  COLOR_RED,
+  COLOR_GREEN,
+  COLOR_YELLOW
+};
+
+static GLogColor SeverityToColor(LogSeverity severity) {
+  assert(severity >= 0 && severity < NUM_SEVERITIES);
+  GLogColor color = COLOR_DEFAULT;
+  switch (severity) {
+  case GLOG_INFO:
+    color = COLOR_DEFAULT;
+    break;
+  case GLOG_WARNING:
+    color = COLOR_YELLOW;
+    break;
+  case GLOG_ERROR:
+  case GLOG_FATAL:
+    color = COLOR_RED;
+    break;
+  default:
+    // should never get here.
+    assert(false);
+  }
+  return color;
+}
+
+#ifdef OS_WINDOWS
+
+// Returns the character attribute for the given color.
+static WORD GetColorAttribute(GLogColor color) {
+  switch (color) {
+    case COLOR_RED:    return FOREGROUND_RED;
+    case COLOR_GREEN:  return FOREGROUND_GREEN;
+    case COLOR_YELLOW: return FOREGROUND_RED | FOREGROUND_GREEN;
+    default:           return 0;
+  }
+}
+
+#else
+
+// Returns the ANSI color code for the given color.
+static const char* GetAnsiColorCode(GLogColor color) {
+  switch (color) {
+  case COLOR_RED:     return "1";
+  case COLOR_GREEN:   return "2";
+  case COLOR_YELLOW:  return "3";
+  case COLOR_DEFAULT:  return "";
+  };
+  return NULL; // stop warning about return type.
+}
+
+#endif  // OS_WINDOWS
+
+// Safely get max_log_size, overriding to 1 if it somehow gets defined as 0
+static int32 MaxLogSize() {
+  return (FLAGS_max_log_size > 0 ? FLAGS_max_log_size : 1);
+}
+
+// An arbitrary limit on the length of a single log message.  This
+// is so that streaming can be done more efficiently.
+const size_t LogMessage::kMaxLogMessageLen = 30000;
+
+struct LogMessage::LogMessageData  {
+  LogMessageData();
+
+  int preserved_errno_;      // preserved errno
+  // Buffer space; contains complete message text.
+  char message_text_[LogMessage::kMaxLogMessageLen+1];
+  LogStream stream_;
+  char severity_;      // What level is this LogMessage logged at?
+  int line_;                 // line number where logging call is.
+  void (LogMessage::*send_method_)();  // Call this in destructor to send
+  union {  // At most one of these is used: union to keep the size low.
+    LogSink* sink_;             // NULL or sink to send message to
+    std::vector<std::string>* outvec_; // NULL or vector to push message onto
+    std::string* message_;             // NULL or string to write message into
+  };
+  time_t timestamp_;            // Time of creation of LogMessage
+  struct ::tm tm_time_;         // Time of creation of LogMessage
+  int32 usecs_;                   // Time of creation of LogMessage - microseconds part
+  size_t num_prefix_chars_;     // # of chars of prefix in this message
+  size_t num_chars_to_log_;     // # of chars of msg to send to log
+  size_t num_chars_to_syslog_;  // # of chars of msg to send to syslog
+  const char* basename_;        // basename of file that called LOG
+  const char* fullname_;        // fullname of file that called LOG
+  bool has_been_flushed_;       // false => data has not been flushed
+  bool first_fatal_;            // true => this was first fatal msg
+
+ private:
+  LogMessageData(const LogMessageData&);
+  void operator=(const LogMessageData&);
+};
+
+// A mutex that allows only one thread to log at a time, to keep things from
+// getting jumbled.  Some other very uncommon logging operations (like
+// changing the destination file for log messages of a given severity) also
+// lock this mutex.  Please be sure that anybody who might possibly need to
+// lock it does so.
+static Mutex log_mutex;
+
+// Number of messages sent at each severity.  Under log_mutex.
+int64 LogMessage::num_messages_[NUM_SEVERITIES] = {0, 0, 0, 0};
+
+// Globally disable log writing (if disk is full)
+static bool stop_writing = false;
+
+const char*const LogSeverityNames[NUM_SEVERITIES] = {
+  "INFO", "WARNING", "ERROR", "FATAL"
+};
+
+// Has the user called SetExitOnDFatal(true)?
+static bool exit_on_dfatal = true;
+
+const char* GetLogSeverityName(LogSeverity severity) {
+  return LogSeverityNames[severity];
+}
+
+static bool SendEmailInternal(const char*dest, const char *subject,
+                              const char*body, bool use_logging);
+
+base::Logger::~Logger() {
+}
+
+namespace {
+
+// Encapsulates all file-system related state
+class LogFileObject : public base::Logger {
+ public:
+  LogFileObject(LogSeverity severity, const char* base_filename);
+  ~LogFileObject();
+
+  virtual void Write(bool force_flush, // Should we force a flush here?
+                     time_t timestamp,  // Timestamp for this entry
+                     const char* message,
+                     int message_len);
+
+  // Configuration options
+  void SetBasename(const char* basename);
+  void SetExtension(const char* ext);
+  void SetSymlinkBasename(const char* symlink_basename);
+
+  // Normal flushing routine
+  virtual void Flush();
+
+  // It is the actual file length for the system loggers,
+  // i.e., INFO, ERROR, etc.
+  virtual uint32 LogSize() {
+    MutexLock l(&lock_);
+    return file_length_;
+  }
+
+  // Internal flush routine.  Exposed so that FlushLogFilesUnsafe()
+  // can avoid grabbing a lock.  Usually Flush() calls it after
+  // acquiring lock_.
+  void FlushUnlocked();
+
+ private:
+  static const uint32 kRolloverAttemptFrequency = 0x20;
+
+  Mutex lock_;
+  bool base_filename_selected_;
+  string base_filename_;
+  string symlink_basename_;
+  string filename_extension_;     // option users can specify (eg to add port#)
+  FILE* file_;
+  LogSeverity severity_;
+  uint32 bytes_since_flush_;
+  uint32 dropped_mem_length_;
+  uint32 file_length_;
+  unsigned int rollover_attempt_;
+  int64 next_flush_time_;         // cycle count at which to flush log
+
+  // Actually create a logfile using the value of base_filename_ and the
+  // optional argument time_pid_string
+  // REQUIRES: lock_ is held
+  bool CreateLogfile(const string& time_pid_string);
+};
+
+}  // namespace
+
+class LogDestination {
+ public:
+  friend class LogMessage;
+  friend void ReprintFatalMessage();
+  friend base::Logger* base::GetLogger(LogSeverity);
+  friend void base::SetLogger(LogSeverity, base::Logger*);
+
+  // These methods are just forwarded to by their global versions.
+  static void SetLogDestination(LogSeverity severity,
+				const char* base_filename);
+  static void SetLogSymlink(LogSeverity severity,
+                            const char* symlink_basename);
+  static void AddLogSink(LogSink *destination);
+  static void RemoveLogSink(LogSink *destination);
+  static void SetLogFilenameExtension(const char* filename_extension);
+  static void SetStderrLogging(LogSeverity min_severity);
+  static void SetEmailLogging(LogSeverity min_severity, const char* addresses);
+  static void LogToStderr();
+  // Flush all log files that are at least at the given severity level
+  static void FlushLogFiles(int min_severity);
+  static void FlushLogFilesUnsafe(int min_severity);
+
+  // we set the maximum size of our packet to be 1400, the logic being
+  // to prevent fragmentation.
+  // Really this number is arbitrary.
+  static const int kNetworkBytes = 1400;
+
+  static const string& hostname();
+  static const bool& terminal_supports_color() {
+    return terminal_supports_color_;
+  }
+
+  static void DeleteLogDestinations();
+
+ private:
+  LogDestination(LogSeverity severity, const char* base_filename);
+  ~LogDestination();
+
+  // Take a log message of a particular severity and log it to stderr
+  // iff it's of a high enough severity to deserve it.
+  static void MaybeLogToStderr(LogSeverity severity, const char* message,
+			       size_t len);
+
+  // Take a log message of a particular severity and log it to email
+  // iff it's of a high enough severity to deserve it.
+  static void MaybeLogToEmail(LogSeverity severity, const char* message,
+			      size_t len);
+  // Take a log message of a particular severity and log it to a file
+  // iff the base filename is not "" (which means "don't log to me")
+  static void MaybeLogToLogfile(LogSeverity severity,
+                                time_t timestamp,
+				const char* message, size_t len);
+  // Take a log message of a particular severity and log it to the file
+  // for that severity and also for all files with severity less than
+  // this severity.
+  static void LogToAllLogfiles(LogSeverity severity,
+                               time_t timestamp,
+                               const char* message, size_t len);
+
+  // Send logging info to all registered sinks.
+  static void LogToSinks(LogSeverity severity,
+                         const char *full_filename,
+                         const char *base_filename,
+                         int line,
+                         const struct ::tm* tm_time,
+                         const char* message,
+                         size_t message_len,
+                         int32 usecs);
+
+  // Wait for all registered sinks via WaitTillSent
+  // including the optional one in "data".
+  static void WaitForSinks(LogMessage::LogMessageData* data);
+
+  static LogDestination* log_destination(LogSeverity severity);
+
+  LogFileObject fileobject_;
+  base::Logger* logger_;      // Either &fileobject_, or wrapper around it
+
+  static LogDestination* log_destinations_[NUM_SEVERITIES];
+  static LogSeverity email_logging_severity_;
+  static string addresses_;
+  static string hostname_;
+  static bool terminal_supports_color_;
+
+  // arbitrary global logging destinations.
+  static vector<LogSink*>* sinks_;
+
+  // Protects the vector sinks_,
+  // but not the LogSink objects its elements reference.
+  static Mutex sink_mutex_;
+
+  // Disallow
+  LogDestination(const LogDestination&);
+  LogDestination& operator=(const LogDestination&);
+};
+
+// Errors do not get logged to email by default.
+LogSeverity LogDestination::email_logging_severity_ = 99999;
+
+string LogDestination::addresses_;
+string LogDestination::hostname_;
+
+vector<LogSink*>* LogDestination::sinks_ = NULL;
+Mutex LogDestination::sink_mutex_;
+bool LogDestination::terminal_supports_color_ = TerminalSupportsColor();
+
+/* static */
+const string& LogDestination::hostname() {
+  if (hostname_.empty()) {
+    GetHostName(&hostname_);
+    if (hostname_.empty()) {
+      hostname_ = "(unknown)";
+    }
+  }
+  return hostname_;
+}
+
+LogDestination::LogDestination(LogSeverity severity,
+                               const char* base_filename)
+  : fileobject_(severity, base_filename),
+    logger_(&fileobject_) {
+}
+
+LogDestination::~LogDestination() {
+  if (logger_ && logger_ != &fileobject_) {
+    // Delete user-specified logger set via SetLogger().
+    delete logger_;
+  }
+}
+
+inline void LogDestination::FlushLogFilesUnsafe(int min_severity) {
+  // assume we have the log_mutex or we simply don't care
+  // about it
+  for (int i = min_severity; i < NUM_SEVERITIES; i++) {
+    LogDestination* log = log_destinations_[i];
+    if (log != NULL) {
+      // Flush the base fileobject_ logger directly instead of going
+      // through any wrappers to reduce chance of deadlock.
+      log->fileobject_.FlushUnlocked();
+    }
+  }
+}
+
+inline void LogDestination::FlushLogFiles(int min_severity) {
+  // Prevent any subtle race conditions by wrapping a mutex lock around
+  // all this stuff.
+  MutexLock l(&log_mutex);
+  for (int i = min_severity; i < NUM_SEVERITIES; i++) {
+    LogDestination* log = log_destination(i);
+    if (log != NULL) {
+      log->logger_->Flush();
+    }
+  }
+}
+
+inline void LogDestination::SetLogDestination(LogSeverity severity,
+					      const char* base_filename) {
+  assert(severity >= 0 && severity < NUM_SEVERITIES);
+  // Prevent any subtle race conditions by wrapping a mutex lock around
+  // all this stuff.
+  MutexLock l(&log_mutex);
+  log_destination(severity)->fileobject_.SetBasename(base_filename);
+}
+
+inline void LogDestination::SetLogSymlink(LogSeverity severity,
+                                          const char* symlink_basename) {
+  CHECK_GE(severity, 0);
+  CHECK_LT(severity, NUM_SEVERITIES);
+  MutexLock l(&log_mutex);
+  log_destination(severity)->fileobject_.SetSymlinkBasename(symlink_basename);
+}
+
+inline void LogDestination::AddLogSink(LogSink *destination) {
+  // Prevent any subtle race conditions by wrapping a mutex lock around
+  // all this stuff.
+  MutexLock l(&sink_mutex_);
+  if (!sinks_)  sinks_ = new vector<LogSink*>;
+  sinks_->push_back(destination);
+}
+
+inline void LogDestination::RemoveLogSink(LogSink *destination) {
+  // Prevent any subtle race conditions by wrapping a mutex lock around
+  // all this stuff.
+  MutexLock l(&sink_mutex_);
+  // This doesn't keep the sinks in order, but who cares?
+  if (sinks_) {
+    for (int i = sinks_->size() - 1; i >= 0; i--) {
+      if ((*sinks_)[i] == destination) {
+        (*sinks_)[i] = (*sinks_)[sinks_->size() - 1];
+        sinks_->pop_back();
+        break;
+      }
+    }
+  }
+}
+
+inline void LogDestination::SetLogFilenameExtension(const char* ext) {
+  // Prevent any subtle race conditions by wrapping a mutex lock around
+  // all this stuff.
+  MutexLock l(&log_mutex);
+  for ( int severity = 0; severity < NUM_SEVERITIES; ++severity ) {
+    log_destination(severity)->fileobject_.SetExtension(ext);
+  }
+}
+
+inline void LogDestination::SetStderrLogging(LogSeverity min_severity) {
+  assert(min_severity >= 0 && min_severity < NUM_SEVERITIES);
+  // Prevent any subtle race conditions by wrapping a mutex lock around
+  // all this stuff.
+  MutexLock l(&log_mutex);
+  FLAGS_stderrthreshold = min_severity;
+}
+
+inline void LogDestination::LogToStderr() {
+  // *Don't* put this stuff in a mutex lock, since SetStderrLogging &
+  // SetLogDestination already do the locking!
+  SetStderrLogging(0);            // thus everything is "also" logged to stderr
+  for ( int i = 0; i < NUM_SEVERITIES; ++i ) {
+    SetLogDestination(i, "");     // "" turns off logging to a logfile
+  }
+}
+
+inline void LogDestination::SetEmailLogging(LogSeverity min_severity,
+					    const char* addresses) {
+  assert(min_severity >= 0 && min_severity < NUM_SEVERITIES);
+  // Prevent any subtle race conditions by wrapping a mutex lock around
+  // all this stuff.
+  MutexLock l(&log_mutex);
+  LogDestination::email_logging_severity_ = min_severity;
+  LogDestination::addresses_ = addresses;
+}
+
+static void ColoredWriteToStderr(LogSeverity severity,
+                                 const char* message, size_t len) {
+  const GLogColor color =
+      (LogDestination::terminal_supports_color() && FLAGS_colorlogtostderr) ?
+      SeverityToColor(severity) : COLOR_DEFAULT;
+
+  // Avoid using cerr from this module since we may get called during
+  // exit code, and cerr may be partially or fully destroyed by then.
+  if (COLOR_DEFAULT == color) {
+    fwrite(message, len, 1, stderr);
+    return;
+  }
+#ifdef OS_WINDOWS
+  const HANDLE stderr_handle = GetStdHandle(STD_ERROR_HANDLE);
+
+  // Gets the current text color.
+  CONSOLE_SCREEN_BUFFER_INFO buffer_info;
+  GetConsoleScreenBufferInfo(stderr_handle, &buffer_info);
+  const WORD old_color_attrs = buffer_info.wAttributes;
+
+  // We need to flush the stream buffers into the console before each
+  // SetConsoleTextAttribute call lest it affect the text that is already
+  // printed but has not yet reached the console.
+  fflush(stderr);
+  SetConsoleTextAttribute(stderr_handle,
+                          GetColorAttribute(color) | FOREGROUND_INTENSITY);
+  fwrite(message, len, 1, stderr);
+  fflush(stderr);
+  // Restores the text color.
+  SetConsoleTextAttribute(stderr_handle, old_color_attrs);
+#else
+  fprintf(stderr, "\033[0;3%sm", GetAnsiColorCode(color));
+  fwrite(message, len, 1, stderr);
+  fprintf(stderr, "\033[m");  // Resets the terminal to default.
+#endif  // OS_WINDOWS
+}
+
+static void WriteToStderr(const char* message, size_t len) {
+  // Avoid using cerr from this module since we may get called during
+  // exit code, and cerr may be partially or fully destroyed by then.
+  fwrite(message, len, 1, stderr);
+}
+
+inline void LogDestination::MaybeLogToStderr(LogSeverity severity,
+					     const char* message, size_t len) {
+  if ((severity >= FLAGS_stderrthreshold) || FLAGS_alsologtostderr) {
+    ColoredWriteToStderr(severity, message, len);
+#ifdef OS_WINDOWS
+    // On Windows, also output to the debugger
+    ::OutputDebugStringA(string(message,len).c_str());
+#endif
+  }
+}
+
+
+inline void LogDestination::MaybeLogToEmail(LogSeverity severity,
+					    const char* message, size_t len) {
+  if (severity >= email_logging_severity_ ||
+      severity >= FLAGS_logemaillevel) {
+    string to(FLAGS_alsologtoemail);
+    if (!addresses_.empty()) {
+      if (!to.empty()) {
+        to += ",";
+      }
+      to += addresses_;
+    }
+    const string subject(string("[LOG] ") + LogSeverityNames[severity] + ": " +
+                         glog_internal_namespace_::ProgramInvocationShortName());
+    string body(hostname());
+    body += "\n\n";
+    body.append(message, len);
+
+    // should NOT use SendEmail().  The caller of this function holds the
+    // log_mutex and SendEmail() calls LOG/VLOG which will block trying to
+    // acquire the log_mutex object.  Use SendEmailInternal() and set
+    // use_logging to false.
+    SendEmailInternal(to.c_str(), subject.c_str(), body.c_str(), false);
+  }
+}
+
+
+inline void LogDestination::MaybeLogToLogfile(LogSeverity severity,
+                                              time_t timestamp,
+					      const char* message,
+					      size_t len) {
+  const bool should_flush = severity > FLAGS_logbuflevel;
+  LogDestination* destination = log_destination(severity);
+  destination->logger_->Write(should_flush, timestamp, message, len);
+}
+
+inline void LogDestination::LogToAllLogfiles(LogSeverity severity,
+                                             time_t timestamp,
+                                             const char* message,
+                                             size_t len) {
+
+  if ( FLAGS_logtostderr ) {           // global flag: never log to file
+    ColoredWriteToStderr(severity, message, len);
+  } else {
+    for (int i = severity; i >= 0; --i)
+      LogDestination::MaybeLogToLogfile(i, timestamp, message, len);
+  }
+}
+
+inline void LogDestination::LogToSinks(LogSeverity severity,
+                                       const char *full_filename,
+                                       const char *base_filename,
+                                       int line,
+                                       const struct ::tm* tm_time,
+                                       const char* message,
+                                       size_t message_len,
+                                       int32 usecs) {
+  ReaderMutexLock l(&sink_mutex_);
+  if (sinks_) {
+    for (int i = sinks_->size() - 1; i >= 0; i--) {
+      (*sinks_)[i]->send(severity, full_filename, base_filename,
+                         line, tm_time, message, message_len, usecs);
+    }
+  }
+}
+
+inline void LogDestination::WaitForSinks(LogMessage::LogMessageData* data) {
+  ReaderMutexLock l(&sink_mutex_);
+  if (sinks_) {
+    for (int i = sinks_->size() - 1; i >= 0; i--) {
+      (*sinks_)[i]->WaitTillSent();
+    }
+  }
+  const bool send_to_sink =
+      (data->send_method_ == &LogMessage::SendToSink) ||
+      (data->send_method_ == &LogMessage::SendToSinkAndLog);
+  if (send_to_sink && data->sink_ != NULL) {
+    data->sink_->WaitTillSent();
+  }
+}
+
+LogDestination* LogDestination::log_destinations_[NUM_SEVERITIES];
+
+inline LogDestination* LogDestination::log_destination(LogSeverity severity) {
+  assert(severity >=0 && severity < NUM_SEVERITIES);
+  if (!log_destinations_[severity]) {
+    log_destinations_[severity] = new LogDestination(severity, NULL);
+  }
+  return log_destinations_[severity];
+}
+
+void LogDestination::DeleteLogDestinations() {
+  for (int severity = 0; severity < NUM_SEVERITIES; ++severity) {
+    delete log_destinations_[severity];
+    log_destinations_[severity] = NULL;
+  }
+  MutexLock l(&sink_mutex_);
+  delete sinks_;
+  sinks_ = NULL;
+}
+
+namespace {
+
+bool IsGlogLog(const string& filename) {
+  // Check if filename matches the pattern of a glog file:
+  // "<program name>.<hostname>.<user name>.log...".
+  const int kKeywordCount = 4;
+  std::string keywords[kKeywordCount] = {
+    glog_internal_namespace_::ProgramInvocationShortName(),
+    LogDestination::hostname(),
+    MyUserName(),
+    "log"
+  };
+
+  int start_pos = 0;
+  for (int i = 0; i < kKeywordCount; i++) {
+    if (filename.find(keywords[i], start_pos) == filename.npos) {
+      return false;
+    }
+    start_pos += keywords[i].size() + 1;
+  }
+  return true;
+}
+
+bool LastModifiedOver(const string& filepath, int days) {
+  // Try to get the last modified time of this file.
+  struct stat file_stat;
+
+  if (stat(filepath.c_str(), &file_stat) == 0) {
+    // A day is 86400 seconds, so 7 days is 86400 * 7 = 604800 seconds.
+    time_t last_modified_time = file_stat.st_mtime;
+    time_t current_time = time(NULL);
+    return difftime(current_time, last_modified_time) > days * 86400;
+  }
+
+  // If failed to get file stat, don't return true!
+  return false;
+}
+
+vector<string> GetOverdueLogNames(string log_directory, int days) {
+  // The names of overdue logs.
+  vector<string> overdue_log_names;
+
+  // Try to get all files within log_directory.
+  DIR *dir;
+  struct dirent *ent;
+
+  char dir_delim = '/';
+#ifdef OS_WINDOWS
+  dir_delim = '\\';
+#endif
+
+  // If log_directory doesn't end with a slash, append a slash to it.
+  if (log_directory.at(log_directory.size() - 1) != dir_delim) {
+    log_directory += dir_delim;
+  }
+
+  if ((dir=opendir(log_directory.c_str()))) {
+    while ((ent=readdir(dir))) {
+      if (!strcmp(ent->d_name, ".") || !strcmp(ent->d_name, "..")) {
+        continue;
+      }
+      string filepath = log_directory + ent->d_name;
+      if (IsGlogLog(ent->d_name) && LastModifiedOver(filepath, days)) {
+        overdue_log_names.push_back(filepath);
+      }
+    }
+    closedir(dir);
+  }
+
+  return overdue_log_names;
+}
+
+// Is log_cleaner enabled?
+// This option can be enabled by calling google::EnableLogCleaner(days)
+bool log_cleaner_enabled_;
+int log_cleaner_overdue_days_ = 7;
+
+} // namespace
+
+
+namespace {
+
+LogFileObject::LogFileObject(LogSeverity severity,
+                             const char* base_filename)
+  : base_filename_selected_(base_filename != NULL),
+    base_filename_((base_filename != NULL) ? base_filename : ""),
+    symlink_basename_(glog_internal_namespace_::ProgramInvocationShortName()),
+    filename_extension_(),
+    file_(NULL),
+    severity_(severity),
+    bytes_since_flush_(0),
+    dropped_mem_length_(0),
+    file_length_(0),
+    rollover_attempt_(kRolloverAttemptFrequency-1),
+    next_flush_time_(0) {
+  assert(severity >= 0);
+  assert(severity < NUM_SEVERITIES);
+}
+
+LogFileObject::~LogFileObject() {
+  MutexLock l(&lock_);
+  if (file_ != NULL) {
+    fclose(file_);
+    file_ = NULL;
+  }
+}
+
+void LogFileObject::SetBasename(const char* basename) {
+  MutexLock l(&lock_);
+  base_filename_selected_ = true;
+  if (base_filename_ != basename) {
+    // Get rid of old log file since we are changing names
+    if (file_ != NULL) {
+      fclose(file_);
+      file_ = NULL;
+      rollover_attempt_ = kRolloverAttemptFrequency-1;
+    }
+    base_filename_ = basename;
+  }
+}
+
+void LogFileObject::SetExtension(const char* ext) {
+  MutexLock l(&lock_);
+  if (filename_extension_ != ext) {
+    // Get rid of old log file since we are changing names
+    if (file_ != NULL) {
+      fclose(file_);
+      file_ = NULL;
+      rollover_attempt_ = kRolloverAttemptFrequency-1;
+    }
+    filename_extension_ = ext;
+  }
+}
+
+void LogFileObject::SetSymlinkBasename(const char* symlink_basename) {
+  MutexLock l(&lock_);
+  symlink_basename_ = symlink_basename;
+}
+
+void LogFileObject::Flush() {
+  MutexLock l(&lock_);
+  FlushUnlocked();
+}
+
+void LogFileObject::FlushUnlocked(){
+  if (file_ != NULL) {
+    fflush(file_);
+    bytes_since_flush_ = 0;
+  }
+  // Figure out when we are due for another flush.
+  const int64 next = (FLAGS_logbufsecs
+                      * static_cast<int64>(1000000));  // in usec
+  next_flush_time_ = CycleClock_Now() + UsecToCycles(next);
+}
+
+bool LogFileObject::CreateLogfile(const string& time_pid_string) {
+  string string_filename = base_filename_+filename_extension_;
+  if (FLAGS_timestamp_in_logfile_name) {
+    string_filename += time_pid_string;
+  }
+  const char* filename = string_filename.c_str();
+  //only write to files, create if non-existant.
+  int flags = O_WRONLY | O_CREAT;
+  if (FLAGS_timestamp_in_logfile_name) {
+    //demand that the file is unique for our timestamp (fail if it exists).
+    flags = flags | O_EXCL;
+  }
+  int fd = open(filename, flags, FLAGS_logfile_mode);
+  if (fd == -1) return false;
+#ifdef HAVE_FCNTL
+  // Mark the file close-on-exec. We don't really care if this fails
+  fcntl(fd, F_SETFD, FD_CLOEXEC);
+
+  // Mark the file as exclusive write access to avoid two clients logging to the
+  // same file. This applies particularly when !FLAGS_timestamp_in_logfile_name
+  // (otherwise open would fail because the O_EXCL flag on similar filename).
+  // locks are released on unlock or close() automatically, only after log is
+  // released.
+  // This will work after a fork as it is not inherited (not stored in the fd).
+  // Lock will not be lost because the file is opened with exclusive lock (write)
+  // and we will never read from it inside the process.
+  // TODO windows implementation of this (as flock is not available on mingw).
+  static struct flock w_lock;
+
+  w_lock.l_type = F_WRLCK;
+  w_lock.l_start = 0;
+  w_lock.l_whence = SEEK_SET;
+  w_lock.l_len = 0;
+
+  int wlock_ret = fcntl(fd, F_SETLK, &w_lock);
+  if (wlock_ret == -1) {
+      close(fd); //as we are failing already, do not check errors here
+      return false;
+  }
+#endif
+
+  //fdopen in append mode so if the file exists it will fseek to the end
+  file_ = fdopen(fd, "a");  // Make a FILE*.
+  if (file_ == NULL) {  // Man, we're screwed!
+    close(fd);
+    if (FLAGS_timestamp_in_logfile_name) {
+      unlink(filename);  // Erase the half-baked evidence: an unusable log file, only if we just created it.
+    }
+    return false;
+  }
+#ifdef OS_WINDOWS
+  // https://github.com/golang/go/issues/27638 - make sure we seek to the end to append
+  // empirically replicated with wine over mingw build
+  if (!FLAGS_timestamp_in_logfile_name) {
+    if (fseek(file_, 0, SEEK_END) != 0) {
+      return false;
+    }
+  }
+#endif
+  // We try to create a symlink called <program_name>.<severity>,
+  // which is easier to use.  (Every time we create a new logfile,
+  // we destroy the old symlink and create a new one, so it always
+  // points to the latest logfile.)  If it fails, we're sad but it's
+  // no error.
+  if (!symlink_basename_.empty()) {
+    // take directory from filename
+    const char* slash = strrchr(filename, PATH_SEPARATOR);
+    const string linkname =
+      symlink_basename_ + '.' + LogSeverityNames[severity_];
+    string linkpath;
+    if ( slash ) linkpath = string(filename, slash-filename+1);  // get dirname
+    linkpath += linkname;
+    unlink(linkpath.c_str());                    // delete old one if it exists
+
+#if defined(OS_WINDOWS)
+    // TODO(hamaji): Create lnk file on Windows?
+#elif defined(HAVE_UNISTD_H)
+    // We must have unistd.h.
+    // Make the symlink be relative (in the same dir) so that if the
+    // entire log directory gets relocated the link is still valid.
+    const char *linkdest = slash ? (slash + 1) : filename;
+    if (symlink(linkdest, linkpath.c_str()) != 0) {
+      // silently ignore failures
+    }
+
+    // Make an additional link to the log file in a place specified by
+    // FLAGS_log_link, if indicated
+    if (!FLAGS_log_link.empty()) {
+      linkpath = FLAGS_log_link + "/" + linkname;
+      unlink(linkpath.c_str());                  // delete old one if it exists
+      if (symlink(filename, linkpath.c_str()) != 0) {
+        // silently ignore failures
+      }
+    }
+#endif
+  }
+
+  return true;  // Everything worked
+}
+
+void LogFileObject::Write(bool force_flush,
+                          time_t timestamp,
+                          const char* message,
+                          int message_len) {
+  MutexLock l(&lock_);
+
+  // We don't log if the base_name_ is "" (which means "don't write")
+  if (base_filename_selected_ && base_filename_.empty()) {
+    return;
+  }
+
+  if (static_cast<int>(file_length_ >> 20) >= MaxLogSize() ||
+      PidHasChanged()) {
+    if (file_ != NULL) fclose(file_);
+    file_ = NULL;
+    file_length_ = bytes_since_flush_ = dropped_mem_length_ = 0;
+    rollover_attempt_ = kRolloverAttemptFrequency-1;
+  }
+
+  // If there's no destination file, make one before outputting
+  if (file_ == NULL) {
+    // Try to rollover the log file every 32 log messages.  The only time
+    // this could matter would be when we have trouble creating the log
+    // file.  If that happens, we'll lose lots of log messages, of course!
+    if (++rollover_attempt_ != kRolloverAttemptFrequency) return;
+    rollover_attempt_ = 0;
+
+    struct ::tm tm_time;
+    localtime_r(&timestamp, &tm_time);
+
+    // The logfile's filename will have the date/time & pid in it
+    ostringstream time_pid_stream;
+    time_pid_stream.fill('0');
+    time_pid_stream << 1900+tm_time.tm_year
+                    << setw(2) << 1+tm_time.tm_mon
+                    << setw(2) << tm_time.tm_mday
+                    << '-'
+                    << setw(2) << tm_time.tm_hour
+                    << setw(2) << tm_time.tm_min
+                    << setw(2) << tm_time.tm_sec
+                    << '.'
+                    << GetMainThreadPid();
+    const string& time_pid_string = time_pid_stream.str();
+
+    if (base_filename_selected_) {
+      if (!CreateLogfile(time_pid_string)) {
+        perror("Could not create log file");
+        fprintf(stderr, "COULD NOT CREATE LOGFILE '%s'!\n",
+                time_pid_string.c_str());
+        return;
+      }
+    } else {
+      // If no base filename for logs of this severity has been set, use a
+      // default base filename of
+      // "<program name>.<hostname>.<user name>.log.<severity level>.".  So
+      // logfiles will have names like
+      // webserver.examplehost.root.log.INFO.19990817-150000.4354, where
+      // 19990817 is a date (1999 August 17), 150000 is a time (15:00:00),
+      // and 4354 is the pid of the logging process.  The date & time reflect
+      // when the file was created for output.
+      //
+      // Where does the file get put?  Successively try the directories
+      // "/tmp", and "."
+      string stripped_filename(
+          glog_internal_namespace_::ProgramInvocationShortName());
+      string hostname;
+      GetHostName(&hostname);
+
+      string uidname = MyUserName();
+      // We should not call CHECK() here because this function can be
+      // called after holding on to log_mutex. We don't want to
+      // attempt to hold on to the same mutex, and get into a
+      // deadlock. Simply use a name like invalid-user.
+      if (uidname.empty()) uidname = "invalid-user";
+
+      stripped_filename = stripped_filename+'.'+hostname+'.'
+                          +uidname+".log."
+                          +LogSeverityNames[severity_]+'.';
+      // We're going to (potentially) try to put logs in several different dirs
+      const vector<string> & log_dirs = GetLoggingDirectories();
+
+      // Go through the list of dirs, and try to create the log file in each
+      // until we succeed or run out of options
+      bool success = false;
+      for (vector<string>::const_iterator dir = log_dirs.begin();
+           dir != log_dirs.end();
+           ++dir) {
+        base_filename_ = *dir + "/" + stripped_filename;
+        if ( CreateLogfile(time_pid_string) ) {
+          success = true;
+          break;
+        }
+      }
+      // If we never succeeded, we have to give up
+      if ( success == false ) {
+        perror("Could not create logging file");
+        fprintf(stderr, "COULD NOT CREATE A LOGGINGFILE %s!",
+                time_pid_string.c_str());
+        return;
+      }
+    }
+
+    // Write a header message into the log file
+    ostringstream file_header_stream;
+    file_header_stream.fill('0');
+    file_header_stream << "Log file created at: "
+                       << 1900+tm_time.tm_year << '/'
+                       << setw(2) << 1+tm_time.tm_mon << '/'
+                       << setw(2) << tm_time.tm_mday
+                       << ' '
+                       << setw(2) << tm_time.tm_hour << ':'
+                       << setw(2) << tm_time.tm_min << ':'
+                       << setw(2) << tm_time.tm_sec << '\n'
+                       << "Running on machine: "
+                       << LogDestination::hostname() << '\n'
+                       << "Log line format: [IWEF]yyyymmdd hh:mm:ss.uuuuuu "
+                       << "threadid file:line] msg" << '\n';
+    const string& file_header_string = file_header_stream.str();
+
+    const int header_len = file_header_string.size();
+    fwrite(file_header_string.data(), 1, header_len, file_);
+    file_length_ += header_len;
+    bytes_since_flush_ += header_len;
+  }
+ 
+  // Write to LOG file
+  if ( !stop_writing ) {
+    // fwrite() doesn't return an error when the disk is full, for
+    // messages that are less than 4096 bytes. When the disk is full,
+    // it returns the message length for messages that are less than
+    // 4096 bytes. fwrite() returns 4096 for message lengths that are
+    // greater than 4096, thereby indicating an error.
+    errno = 0;
+    fwrite(message, 1, message_len, file_);
+    if ( FLAGS_stop_logging_if_full_disk &&
+         errno == ENOSPC ) {  // disk full, stop writing to disk
+      stop_writing = true;  // until the disk is
+      return;
+    } else {
+      file_length_ += message_len;
+      bytes_since_flush_ += message_len;
+    }
+  } else {
+    if ( CycleClock_Now() >= next_flush_time_ )
+      stop_writing = false;  // check to see if disk has free space.
+    return;  // no need to flush
+  }
+
+  // See important msgs *now*.  Also, flush logs at least every 10^6 chars,
+  // or every "FLAGS_logbufsecs" seconds.
+  if ( force_flush ||
+       (bytes_since_flush_ >= 1000000) ||
+       (CycleClock_Now() >= next_flush_time_) ) {
+    FlushUnlocked();
+#ifdef OS_LINUX
+    // Only consider files >= 3MiB
+    if (FLAGS_drop_log_memory && file_length_ >= (3 << 20)) {
+      // Don't evict the most recent 1-2MiB so as not to impact a tailer
+      // of the log file and to avoid page rounding issue on linux < 4.7
+      uint32 total_drop_length = (file_length_ & ~((1 << 20) - 1)) - (1 << 20);
+      uint32 this_drop_length = total_drop_length - dropped_mem_length_;
+      if (this_drop_length >= (2 << 20)) {
+        // Only advise when >= 2MiB to drop
+# if defined(__ANDROID__) && defined(__ANDROID_API__) && (__ANDROID_API__ < 21)
+        // 'posix_fadvise' introduced in API 21:
+        // * https://android.googlesource.com/platform/bionic/+/6880f936173081297be0dc12f687d341b86a4cfa/libc/libc.map.txt#732
+# else
+        posix_fadvise(fileno(file_), dropped_mem_length_, this_drop_length,
+                      POSIX_FADV_DONTNEED);
+# endif
+        dropped_mem_length_ = total_drop_length;
+      }
+    }
+#endif
+    // Perform clean up for old logs
+    if (log_cleaner_enabled_) {
+      const vector<string>& dirs = GetLoggingDirectories();
+      for (size_t i = 0; i < dirs.size(); i++) {
+        vector<string> logs = GetOverdueLogNames(dirs[i], log_cleaner_overdue_days_);
+        for (size_t j = 0; j < logs.size(); j++) {
+          static_cast<void>(unlink(logs[j].c_str()));
+        }
+      }
+    }
+  }
+}
+
+}  // namespace
+
+// Static log data space to avoid alloc failures in a LOG(FATAL)
+//
+// Since multiple threads may call LOG(FATAL), and we want to preserve
+// the data from the first call, we allocate two sets of space.  One
+// for exclusive use by the first thread, and one for shared use by
+// all other threads.
+static Mutex fatal_msg_lock;
+static CrashReason crash_reason;
+static bool fatal_msg_exclusive = true;
+static LogMessage::LogMessageData fatal_msg_data_exclusive;
+static LogMessage::LogMessageData fatal_msg_data_shared;
+
+#ifdef GLOG_THREAD_LOCAL_STORAGE
+// Static thread-local log data space to use, because typically at most one
+// LogMessageData object exists (in this case glog makes zero heap memory
+// allocations).
+static GLOG_THREAD_LOCAL_STORAGE bool thread_data_available = true;
+
+#ifdef HAVE_ALIGNED_STORAGE
+static GLOG_THREAD_LOCAL_STORAGE
+    std::aligned_storage<sizeof(LogMessage::LogMessageData),
+                         alignof(LogMessage::LogMessageData)>::type thread_msg_data;
+#else
+static GLOG_THREAD_LOCAL_STORAGE
+    char thread_msg_data[sizeof(void*) + sizeof(LogMessage::LogMessageData)];
+#endif  // HAVE_ALIGNED_STORAGE
+#endif  // defined(GLOG_THREAD_LOCAL_STORAGE)
+
+LogMessage::LogMessageData::LogMessageData()
+  : stream_(message_text_, LogMessage::kMaxLogMessageLen, 0) {
+}
+
+LogMessage::LogMessage(const char* file, int line, LogSeverity severity,
+                       int ctr, void (LogMessage::*send_method)())
+    : allocated_(NULL) {
+  Init(file, line, severity, send_method);
+  data_->stream_.set_ctr(ctr);
+}
+
+LogMessage::LogMessage(const char* file, int line,
+                       const CheckOpString& result)
+    : allocated_(NULL) {
+  Init(file, line, GLOG_FATAL, &LogMessage::SendToLog);
+  stream() << "Check failed: " << (*result.str_) << " ";
+}
+
+LogMessage::LogMessage(const char* file, int line)
+    : allocated_(NULL) {
+  Init(file, line, GLOG_INFO, &LogMessage::SendToLog);
+}
+
+LogMessage::LogMessage(const char* file, int line, LogSeverity severity)
+    : allocated_(NULL) {
+  Init(file, line, severity, &LogMessage::SendToLog);
+}
+
+LogMessage::LogMessage(const char* file, int line, LogSeverity severity,
+                       LogSink* sink, bool also_send_to_log)
+    : allocated_(NULL) {
+  Init(file, line, severity, also_send_to_log ? &LogMessage::SendToSinkAndLog :
+                                                &LogMessage::SendToSink);
+  data_->sink_ = sink;  // override Init()'s setting to NULL
+}
+
+LogMessage::LogMessage(const char* file, int line, LogSeverity severity,
+                       vector<string> *outvec)
+    : allocated_(NULL) {
+  Init(file, line, severity, &LogMessage::SaveOrSendToLog);
+  data_->outvec_ = outvec; // override Init()'s setting to NULL
+}
+
+LogMessage::LogMessage(const char* file, int line, LogSeverity severity,
+                       string *message)
+    : allocated_(NULL) {
+  Init(file, line, severity, &LogMessage::WriteToStringAndLog);
+  data_->message_ = message;  // override Init()'s setting to NULL
+}
+
+void LogMessage::Init(const char* file,
+                      int line,
+                      LogSeverity severity,
+                      void (LogMessage::*send_method)()) {
+  allocated_ = NULL;
+  if (severity != GLOG_FATAL || !exit_on_dfatal) {
+#ifdef GLOG_THREAD_LOCAL_STORAGE
+    // No need for locking, because this is thread local.
+    if (thread_data_available) {
+      thread_data_available = false;
+#ifdef HAVE_ALIGNED_STORAGE
+      data_ = new (&thread_msg_data) LogMessageData;
+#else
+      const uintptr_t kAlign = sizeof(void*) - 1;
+
+      char* align_ptr =
+          reinterpret_cast<char*>(reinterpret_cast<uintptr_t>(thread_msg_data + kAlign) & ~kAlign);
+      data_ = new (align_ptr) LogMessageData;
+      assert(reinterpret_cast<uintptr_t>(align_ptr) % sizeof(void*) == 0);
+#endif
+    } else {
+      allocated_ = new LogMessageData();
+      data_ = allocated_;
+    }
+#else // !defined(GLOG_THREAD_LOCAL_STORAGE)
+    allocated_ = new LogMessageData();
+    data_ = allocated_;
+#endif // defined(GLOG_THREAD_LOCAL_STORAGE)
+    data_->first_fatal_ = false;
+  } else {
+    MutexLock l(&fatal_msg_lock);
+    if (fatal_msg_exclusive) {
+      fatal_msg_exclusive = false;
+      data_ = &fatal_msg_data_exclusive;
+      data_->first_fatal_ = true;
+    } else {
+      data_ = &fatal_msg_data_shared;
+      data_->first_fatal_ = false;
+    }
+  }
+
+  stream().fill('0');
+  data_->preserved_errno_ = errno;
+  data_->severity_ = severity;
+  data_->line_ = line;
+  data_->send_method_ = send_method;
+  data_->sink_ = NULL;
+  data_->outvec_ = NULL;
+  WallTime now = WallTime_Now();
+  data_->timestamp_ = static_cast<time_t>(now);
+  localtime_r(&data_->timestamp_, &data_->tm_time_);
+  data_->usecs_ = static_cast<int32>((now - data_->timestamp_) * 1000000);
+
+  data_->num_chars_to_log_ = 0;
+  data_->num_chars_to_syslog_ = 0;
+  data_->basename_ = const_basename(file);
+  data_->fullname_ = file;
+  data_->has_been_flushed_ = false;
+
+  // If specified, prepend a prefix to each line.  For example:
+  //    I20201018 160715 f5d4fbb0 logging.cc:1153]
+  //    (log level, GMT year, month, date, time, thread_id, file basename, line)
+  // We exclude the thread_id for the default thread.
+  if (FLAGS_log_prefix && (line != kNoLogPrefix)) {
+    stream() << LogSeverityNames[severity][0]
+             << setw(4) << 1900+data_->tm_time_.tm_year
+             << setw(2) << 1+data_->tm_time_.tm_mon
+             << setw(2) << data_->tm_time_.tm_mday
+             << ' '
+             << setw(2) << data_->tm_time_.tm_hour  << ':'
+             << setw(2) << data_->tm_time_.tm_min   << ':'
+             << setw(2) << data_->tm_time_.tm_sec   << "."
+             << setw(6) << data_->usecs_
+             << ' '
+             << setfill(' ') << setw(5)
+             << static_cast<unsigned int>(GetTID()) << setfill('0')
+             << ' '
+             << data_->basename_ << ':' << data_->line_ << "] ";
+  }
+  data_->num_prefix_chars_ = data_->stream_.pcount();
+
+  if (!FLAGS_log_backtrace_at.empty()) {
+    char fileline[128];
+    snprintf(fileline, sizeof(fileline), "%s:%d", data_->basename_, line);
+#ifdef HAVE_STACKTRACE
+    if (!strcmp(FLAGS_log_backtrace_at.c_str(), fileline)) {
+      string stacktrace;
+      DumpStackTraceToString(&stacktrace);
+      stream() << " (stacktrace:\n" << stacktrace << ") ";
+    }
+#endif
+  }
+}
+
+LogMessage::~LogMessage() {
+  Flush();
+#ifdef GLOG_THREAD_LOCAL_STORAGE
+  if (data_ == static_cast<void*>(&thread_msg_data)) {
+    data_->~LogMessageData();
+    thread_data_available = true;
+  }
+  else {
+    delete allocated_;
+  }
+#else // !defined(GLOG_THREAD_LOCAL_STORAGE)
+  delete allocated_;
+#endif // defined(GLOG_THREAD_LOCAL_STORAGE)
+}
+
+int LogMessage::preserved_errno() const {
+  return data_->preserved_errno_;
+}
+
+ostream& LogMessage::stream() {
+  return data_->stream_;
+}
+
+// Flush buffered message, called by the destructor, or any other function
+// that needs to synchronize the log.
+void LogMessage::Flush() {
+  if (data_->has_been_flushed_ || data_->severity_ < FLAGS_minloglevel)
+    return;
+
+  data_->num_chars_to_log_ = data_->stream_.pcount();
+  data_->num_chars_to_syslog_ =
+    data_->num_chars_to_log_ - data_->num_prefix_chars_;
+
+  // Do we need to add a \n to the end of this message?
+  bool append_newline =
+      (data_->message_text_[data_->num_chars_to_log_-1] != '\n');
+  char original_final_char = '\0';
+
+  // If we do need to add a \n, we'll do it by violating the memory of the
+  // ostrstream buffer.  This is quick, and we'll make sure to undo our
+  // modification before anything else is done with the ostrstream.  It
+  // would be preferable not to do things this way, but it seems to be
+  // the best way to deal with this.
+  if (append_newline) {
+    original_final_char = data_->message_text_[data_->num_chars_to_log_];
+    data_->message_text_[data_->num_chars_to_log_++] = '\n';
+  }
+
+  // Prevent any subtle race conditions by wrapping a mutex lock around
+  // the actual logging action per se.
+  {
+    MutexLock l(&log_mutex);
+    (this->*(data_->send_method_))();
+    ++num_messages_[static_cast<int>(data_->severity_)];
+  }
+  LogDestination::WaitForSinks(data_);
+
+  if (append_newline) {
+    // Fix the ostrstream back how it was before we screwed with it.
+    // It's 99.44% certain that we don't need to worry about doing this.
+    data_->message_text_[data_->num_chars_to_log_-1] = original_final_char;
+  }
+
+  // If errno was already set before we enter the logging call, we'll
+  // set it back to that value when we return from the logging call.
+  // It happens often that we log an error message after a syscall
+  // failure, which can potentially set the errno to some other
+  // values.  We would like to preserve the original errno.
+  if (data_->preserved_errno_ != 0) {
+    errno = data_->preserved_errno_;
+  }
+
+  // Note that this message is now safely logged.  If we're asked to flush
+  // again, as a result of destruction, say, we'll do nothing on future calls.
+  data_->has_been_flushed_ = true;
+}
+
+// Copy of first FATAL log message so that we can print it out again
+// after all the stack traces.  To preserve legacy behavior, we don't
+// use fatal_msg_data_exclusive.
+static time_t fatal_time;
+static char fatal_message[256];
+
+void ReprintFatalMessage() {
+  if (fatal_message[0]) {
+    const int n = strlen(fatal_message);
+    if (!FLAGS_logtostderr) {
+      // Also write to stderr (don't color to avoid terminal checks)
+      WriteToStderr(fatal_message, n);
+    }
+    LogDestination::LogToAllLogfiles(GLOG_ERROR, fatal_time, fatal_message, n);
+  }
+}
+
+// L >= log_mutex (callers must hold the log_mutex).
+void LogMessage::SendToLog() EXCLUSIVE_LOCKS_REQUIRED(log_mutex) {
+  static bool already_warned_before_initgoogle = false;
+
+  log_mutex.AssertHeld();
+
+  RAW_DCHECK(data_->num_chars_to_log_ > 0 &&
+             data_->message_text_[data_->num_chars_to_log_-1] == '\n', "");
+
+  // Messages of a given severity get logged to lower severity logs, too
+
+  if (!already_warned_before_initgoogle && !IsGoogleLoggingInitialized()) {
+    const char w[] = "WARNING: Logging before InitGoogleLogging() is "
+                     "written to STDERR\n";
+    WriteToStderr(w, strlen(w));
+    already_warned_before_initgoogle = true;
+  }
+
+  // global flag: never log to file if set.  Also -- don't log to a
+  // file if we haven't parsed the command line flags to get the
+  // program name.
+  if (FLAGS_logtostderr || !IsGoogleLoggingInitialized()) {
+    ColoredWriteToStderr(data_->severity_,
+                         data_->message_text_, data_->num_chars_to_log_);
+
+    // this could be protected by a flag if necessary.
+    LogDestination::LogToSinks(data_->severity_,
+                               data_->fullname_, data_->basename_,
+                               data_->line_, &data_->tm_time_,
+                               data_->message_text_ + data_->num_prefix_chars_,
+                               (data_->num_chars_to_log_ -
+                                data_->num_prefix_chars_ - 1),
+                               data_->usecs_);
+  } else {
+
+    // log this message to all log files of severity <= severity_
+    LogDestination::LogToAllLogfiles(data_->severity_, data_->timestamp_,
+                                     data_->message_text_,
+                                     data_->num_chars_to_log_);
+
+    LogDestination::MaybeLogToStderr(data_->severity_, data_->message_text_,
+                                     data_->num_chars_to_log_);
+    LogDestination::MaybeLogToEmail(data_->severity_, data_->message_text_,
+                                    data_->num_chars_to_log_);
+    LogDestination::LogToSinks(data_->severity_,
+                               data_->fullname_, data_->basename_,
+                               data_->line_, &data_->tm_time_,
+                               data_->message_text_ + data_->num_prefix_chars_,
+                               (data_->num_chars_to_log_
+                                - data_->num_prefix_chars_ - 1),
+                               data_->usecs_);
+    // NOTE: -1 removes trailing \n
+  }
+
+  // If we log a FATAL message, flush all the log destinations, then toss
+  // a signal for others to catch. We leave the logs in a state that
+  // someone else can use them (as long as they flush afterwards)
+  if (data_->severity_ == GLOG_FATAL && exit_on_dfatal) {
+    if (data_->first_fatal_) {
+      // Store crash information so that it is accessible from within signal
+      // handlers that may be invoked later.
+      RecordCrashReason(&crash_reason);
+      SetCrashReason(&crash_reason);
+
+      // Store shortened fatal message for other logs and GWQ status
+      const int copy = min<int>(data_->num_chars_to_log_,
+                                sizeof(fatal_message)-1);
+      memcpy(fatal_message, data_->message_text_, copy);
+      fatal_message[copy] = '\0';
+      fatal_time = data_->timestamp_;
+    }
+
+    if (!FLAGS_logtostderr) {
+      for (int i = 0; i < NUM_SEVERITIES; ++i) {
+        if ( LogDestination::log_destinations_[i] )
+          LogDestination::log_destinations_[i]->logger_->Write(true, 0, "", 0);
+      }
+    }
+
+    // release the lock that our caller (directly or indirectly)
+    // LogMessage::~LogMessage() grabbed so that signal handlers
+    // can use the logging facility. Alternately, we could add
+    // an entire unsafe logging interface to bypass locking
+    // for signal handlers but this seems simpler.
+    log_mutex.Unlock();
+    LogDestination::WaitForSinks(data_);
+
+    const char* message = "*** Check failure stack trace: ***\n";
+    if (write(STDERR_FILENO, message, strlen(message)) < 0) {
+      // Ignore errors.
+    }
+    Fail();
+  }
+}
+
+void LogMessage::RecordCrashReason(
+    glog_internal_namespace_::CrashReason* reason) {
+  reason->filename = fatal_msg_data_exclusive.fullname_;
+  reason->line_number = fatal_msg_data_exclusive.line_;
+  reason->message = fatal_msg_data_exclusive.message_text_ +
+                    fatal_msg_data_exclusive.num_prefix_chars_;
+#ifdef HAVE_STACKTRACE
+  // Retrieve the stack trace, omitting the logging frames that got us here.
+  reason->depth = GetStackTrace(reason->stack, ARRAYSIZE(reason->stack), 4);
+#else
+  reason->depth = 0;
+#endif
+}
+
+#ifdef HAVE___ATTRIBUTE__
+# define ATTRIBUTE_NORETURN __attribute__((noreturn))
+#else
+# define ATTRIBUTE_NORETURN
+#endif
+
+#if defined(OS_WINDOWS)
+__declspec(noreturn)
+#endif
+static void logging_fail() ATTRIBUTE_NORETURN;
+
+static void logging_fail() {
+  abort();
+}
+
+typedef void (*logging_fail_func_t)() ATTRIBUTE_NORETURN;
+
+GOOGLE_GLOG_DLL_DECL
+logging_fail_func_t g_logging_fail_func = &logging_fail;
+
+void InstallFailureFunction(void (*fail_func)()) {
+  g_logging_fail_func = (logging_fail_func_t)fail_func;
+}
+
+void LogMessage::Fail() {
+  g_logging_fail_func();
+}
+
+// L >= log_mutex (callers must hold the log_mutex).
+void LogMessage::SendToSink() EXCLUSIVE_LOCKS_REQUIRED(log_mutex) {
+  if (data_->sink_ != NULL) {
+    RAW_DCHECK(data_->num_chars_to_log_ > 0 &&
+               data_->message_text_[data_->num_chars_to_log_-1] == '\n', "");
+    data_->sink_->send(data_->severity_, data_->fullname_, data_->basename_,
+                       data_->line_, &data_->tm_time_,
+                       data_->message_text_ + data_->num_prefix_chars_,
+                       (data_->num_chars_to_log_ -
+                        data_->num_prefix_chars_ - 1),
+                       data_->usecs_);
+  }
+}
+
+// L >= log_mutex (callers must hold the log_mutex).
+void LogMessage::SendToSinkAndLog() EXCLUSIVE_LOCKS_REQUIRED(log_mutex) {
+  SendToSink();
+  SendToLog();
+}
+
+// L >= log_mutex (callers must hold the log_mutex).
+void LogMessage::SaveOrSendToLog() EXCLUSIVE_LOCKS_REQUIRED(log_mutex) {
+  if (data_->outvec_ != NULL) {
+    RAW_DCHECK(data_->num_chars_to_log_ > 0 &&
+               data_->message_text_[data_->num_chars_to_log_-1] == '\n', "");
+    // Omit prefix of message and trailing newline when recording in outvec_.
+    const char *start = data_->message_text_ + data_->num_prefix_chars_;
+    int len = data_->num_chars_to_log_ - data_->num_prefix_chars_ - 1;
+    data_->outvec_->push_back(string(start, len));
+  } else {
+    SendToLog();
+  }
+}
+
+void LogMessage::WriteToStringAndLog() EXCLUSIVE_LOCKS_REQUIRED(log_mutex) {
+  if (data_->message_ != NULL) {
+    RAW_DCHECK(data_->num_chars_to_log_ > 0 &&
+               data_->message_text_[data_->num_chars_to_log_-1] == '\n', "");
+    // Omit prefix of message and trailing newline when writing to message_.
+    const char *start = data_->message_text_ + data_->num_prefix_chars_;
+    int len = data_->num_chars_to_log_ - data_->num_prefix_chars_ - 1;
+    data_->message_->assign(start, len);
+  }
+  SendToLog();
+}
+
+// L >= log_mutex (callers must hold the log_mutex).
+void LogMessage::SendToSyslogAndLog() {
+#ifdef HAVE_SYSLOG_H
+  // Before any calls to syslog(), make a single call to openlog()
+  static bool openlog_already_called = false;
+  if (!openlog_already_called) {
+    openlog(glog_internal_namespace_::ProgramInvocationShortName(),
+            LOG_CONS | LOG_NDELAY | LOG_PID,
+            LOG_USER);
+    openlog_already_called = true;
+  }
+
+  // This array maps Google severity levels to syslog levels
+  const int SEVERITY_TO_LEVEL[] = { LOG_INFO, LOG_WARNING, LOG_ERR, LOG_EMERG };
+  syslog(LOG_USER | SEVERITY_TO_LEVEL[static_cast<int>(data_->severity_)], "%.*s",
+         int(data_->num_chars_to_syslog_),
+         data_->message_text_ + data_->num_prefix_chars_);
+  SendToLog();
+#else
+  LOG(ERROR) << "No syslog support: message=" << data_->message_text_;
+#endif
+}
+
+base::Logger* base::GetLogger(LogSeverity severity) {
+  MutexLock l(&log_mutex);
+  return LogDestination::log_destination(severity)->logger_;
+}
+
+void base::SetLogger(LogSeverity severity, base::Logger* logger) {
+  MutexLock l(&log_mutex);
+  LogDestination::log_destination(severity)->logger_ = logger;
+}
+
+// L < log_mutex.  Acquires and releases mutex_.
+int64 LogMessage::num_messages(int severity) {
+  MutexLock l(&log_mutex);
+  return num_messages_[severity];
+}
+
+// Output the COUNTER value. This is only valid if ostream is a
+// LogStream.
+ostream& operator<<(ostream &os, const PRIVATE_Counter&) {
+#ifdef DISABLE_RTTI
+  LogMessage::LogStream *log = static_cast<LogMessage::LogStream*>(&os);
+#else
+  LogMessage::LogStream *log = dynamic_cast<LogMessage::LogStream*>(&os);
+#endif
+  CHECK(log && log == log->self())
+      << "You must not use COUNTER with non-glog ostream";
+  os << log->ctr();
+  return os;
+}
+
+ErrnoLogMessage::ErrnoLogMessage(const char* file, int line,
+                                 LogSeverity severity, int ctr,
+                                 void (LogMessage::*send_method)())
+    : LogMessage(file, line, severity, ctr, send_method) {
+}
+
+ErrnoLogMessage::~ErrnoLogMessage() {
+  // Don't access errno directly because it may have been altered
+  // while streaming the message.
+  stream() << ": " << StrError(preserved_errno()) << " ["
+           << preserved_errno() << "]";
+}
+
+void FlushLogFiles(LogSeverity min_severity) {
+  LogDestination::FlushLogFiles(min_severity);
+}
+
+void FlushLogFilesUnsafe(LogSeverity min_severity) {
+  LogDestination::FlushLogFilesUnsafe(min_severity);
+}
+
+void SetLogDestination(LogSeverity severity, const char* base_filename) {
+  LogDestination::SetLogDestination(severity, base_filename);
+}
+
+void SetLogSymlink(LogSeverity severity, const char* symlink_basename) {
+  LogDestination::SetLogSymlink(severity, symlink_basename);
+}
+
+LogSink::~LogSink() {
+}
+
+void LogSink::WaitTillSent() {
+  // noop default
+}
+
+string LogSink::ToString(LogSeverity severity, const char* file, int line,
+                         const struct ::tm* tm_time,
+                         const char* message, size_t message_len, int32 usecs) {
+  ostringstream stream(string(message, message_len));
+  stream.fill('0');
+
+  stream << LogSeverityNames[severity][0]
+         << setw(4) << 1900+tm_time->tm_year
+         << setw(2) << 1+tm_time->tm_mon
+         << setw(2) << tm_time->tm_mday
+         << ' '
+         << setw(2) << tm_time->tm_hour << ':'
+         << setw(2) << tm_time->tm_min << ':'
+         << setw(2) << tm_time->tm_sec << '.'
+         << setw(6) << usecs
+         << ' '
+         << setfill(' ') << setw(5) << GetTID() << setfill('0')
+         << ' '
+         << file << ':' << line << "] ";
+
+  stream << string(message, message_len);
+  return stream.str();
+}
+
+void AddLogSink(LogSink *destination) {
+  LogDestination::AddLogSink(destination);
+}
+
+void RemoveLogSink(LogSink *destination) {
+  LogDestination::RemoveLogSink(destination);
+}
+
+void SetLogFilenameExtension(const char* ext) {
+  LogDestination::SetLogFilenameExtension(ext);
+}
+
+void SetStderrLogging(LogSeverity min_severity) {
+  LogDestination::SetStderrLogging(min_severity);
+}
+
+void SetEmailLogging(LogSeverity min_severity, const char* addresses) {
+  LogDestination::SetEmailLogging(min_severity, addresses);
+}
+
+void LogToStderr() {
+  LogDestination::LogToStderr();
+}
+
+namespace base {
+namespace internal {
+
+bool GetExitOnDFatal();
+bool GetExitOnDFatal() {
+  MutexLock l(&log_mutex);
+  return exit_on_dfatal;
+}
+
+// Determines whether we exit the program for a LOG(DFATAL) message in
+// debug mode.  It does this by skipping the call to Fail/FailQuietly.
+// This is intended for testing only.
+//
+// This can have some effects on LOG(FATAL) as well.  Failure messages
+// are always allocated (rather than sharing a buffer), the crash
+// reason is not recorded, the "gwq" status message is not updated,
+// and the stack trace is not recorded.  The LOG(FATAL) *will* still
+// exit the program.  Since this function is used only in testing,
+// these differences are acceptable.
+void SetExitOnDFatal(bool value);
+void SetExitOnDFatal(bool value) {
+  MutexLock l(&log_mutex);
+  exit_on_dfatal = value;
+}
+
+}  // namespace internal
+}  // namespace base
+
+// Shell-escaping as we need to shell out ot /bin/mail.
+static const char kDontNeedShellEscapeChars[] =
+            "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+            "abcdefghijklmnopqrstuvwxyz"
+            "0123456789+-_.=/:,@";
+
+static string ShellEscape(const string& src) {
+  string result;
+  if (!src.empty() &&  // empty string needs quotes
+      src.find_first_not_of(kDontNeedShellEscapeChars) == string::npos) {
+    // only contains chars that don't need quotes; it's fine
+    result.assign(src);
+  } else if (src.find_first_of('\'') == string::npos) {
+    // no single quotes; just wrap it in single quotes
+    result.assign("'");
+    result.append(src);
+    result.append("'");
+  } else {
+    // needs double quote escaping
+    result.assign("\"");
+    for (size_t i = 0; i < src.size(); ++i) {
+      switch (src[i]) {
+        case '\\':
+        case '$':
+        case '"':
+        case '`':
+          result.append("\\");
+      }
+      result.append(src, i, 1);
+    }
+    result.append("\"");
+  }
+  return result;
+}
+
+
+// use_logging controls whether the logging functions LOG/VLOG are used
+// to log errors.  It should be set to false when the caller holds the
+// log_mutex.
+static bool SendEmailInternal(const char*dest, const char *subject,
+                              const char*body, bool use_logging) {
+  if (dest && *dest) {
+    if ( use_logging ) {
+      VLOG(1) << "Trying to send TITLE:" << subject
+              << " BODY:" << body << " to " << dest;
+    } else {
+      fprintf(stderr, "Trying to send TITLE: %s BODY: %s to %s\n",
+              subject, body, dest);
+    }
+
+    string cmd =
+        FLAGS_logmailer + " -s" +
+        ShellEscape(subject) + " " + ShellEscape(dest);
+    VLOG(4) << "Mailing command: " << cmd;
+
+    FILE* pipe = popen(cmd.c_str(), "w");
+    if (pipe != NULL) {
+      // Add the body if we have one
+      if (body)
+        fwrite(body, sizeof(char), strlen(body), pipe);
+      bool ok = pclose(pipe) != -1;
+      if ( !ok ) {
+        if ( use_logging ) {
+          LOG(ERROR) << "Problems sending mail to " << dest << ": "
+                     << StrError(errno);
+        } else {
+          fprintf(stderr, "Problems sending mail to %s: %s\n",
+                  dest, StrError(errno).c_str());
+        }
+      }
+      return ok;
+    } else {
+      if ( use_logging ) {
+        LOG(ERROR) << "Unable to send mail to " << dest;
+      } else {
+        fprintf(stderr, "Unable to send mail to %s\n", dest);
+      }
+    }
+  }
+  return false;
+}
+
+bool SendEmail(const char*dest, const char *subject, const char*body){
+  return SendEmailInternal(dest, subject, body, true);
+}
+
+static void GetTempDirectories(vector<string>* list) {
+  list->clear();
+#ifdef OS_WINDOWS
+  // On windows we'll try to find a directory in this order:
+  //   C:/Documents & Settings/whomever/TEMP (or whatever GetTempPath() is)
+  //   C:/TMP/
+  //   C:/TEMP/
+  //   C:/WINDOWS/ or C:/WINNT/
+  //   .
+  char tmp[MAX_PATH];
+  if (GetTempPathA(MAX_PATH, tmp))
+    list->push_back(tmp);
+  list->push_back("C:\\tmp\\");
+  list->push_back("C:\\temp\\");
+#else
+  // Directories, in order of preference. If we find a dir that
+  // exists, we stop adding other less-preferred dirs
+  const char * candidates[] = {
+    // Non-null only during unittest/regtest
+    getenv("TEST_TMPDIR"),
+
+    // Explicitly-supplied temp dirs
+    getenv("TMPDIR"), getenv("TMP"),
+
+    // If all else fails
+    "/tmp",
+  };
+
+  for (size_t i = 0; i < ARRAYSIZE(candidates); i++) {
+    const char *d = candidates[i];
+    if (!d) continue;  // Empty env var
+
+    // Make sure we don't surprise anyone who's expecting a '/'
+    string dstr = d;
+    if (dstr[dstr.size() - 1] != '/') {
+      dstr += "/";
+    }
+    list->push_back(dstr);
+
+    struct stat statbuf;
+    if (!stat(d, &statbuf) && S_ISDIR(statbuf.st_mode)) {
+      // We found a dir that exists - we're done.
+      return;
+    }
+  }
+
+#endif
+}
+
+static vector<string>* logging_directories_list;
+
+const vector<string>& GetLoggingDirectories() {
+  // Not strictly thread-safe but we're called early in InitGoogle().
+  if (logging_directories_list == NULL) {
+    logging_directories_list = new vector<string>;
+
+    if ( !FLAGS_log_dir.empty() ) {
+      // A dir was specified, we should use it
+      logging_directories_list->push_back(FLAGS_log_dir.c_str());
+    } else {
+      GetTempDirectories(logging_directories_list);
+#ifdef OS_WINDOWS
+      char tmp[MAX_PATH];
+      if (GetWindowsDirectoryA(tmp, MAX_PATH))
+        logging_directories_list->push_back(tmp);
+      logging_directories_list->push_back(".\\");
+#else
+      logging_directories_list->push_back("./");
+#endif
+    }
+  }
+  return *logging_directories_list;
+}
+
+void TestOnly_ClearLoggingDirectoriesList() {
+  fprintf(stderr, "TestOnly_ClearLoggingDirectoriesList should only be "
+          "called from test code.\n");
+  delete logging_directories_list;
+  logging_directories_list = NULL;
+}
+
+void GetExistingTempDirectories(vector<string>* list) {
+  GetTempDirectories(list);
+  vector<string>::iterator i_dir = list->begin();
+  while( i_dir != list->end() ) {
+    // zero arg to access means test for existence; no constant
+    // defined on windows
+    if ( access(i_dir->c_str(), 0) ) {
+      i_dir = list->erase(i_dir);
+    } else {
+      ++i_dir;
+    }
+  }
+}
+
+void TruncateLogFile(const char *path, int64 limit, int64 keep) {
+#ifdef HAVE_UNISTD_H
+  struct stat statbuf;
+  const int kCopyBlockSize = 8 << 10;
+  char copybuf[kCopyBlockSize];
+  int64 read_offset, write_offset;
+  // Don't follow symlinks unless they're our own fd symlinks in /proc
+  int flags = O_RDWR;
+  // TODO(hamaji): Support other environments.
+#ifdef OS_LINUX
+  const char *procfd_prefix = "/proc/self/fd/";
+  if (strncmp(procfd_prefix, path, strlen(procfd_prefix))) flags |= O_NOFOLLOW;
+#endif
+
+  int fd = open(path, flags);
+  if (fd == -1) {
+    if (errno == EFBIG) {
+      // The log file in question has got too big for us to open. The
+      // real fix for this would be to compile logging.cc (or probably
+      // all of base/...) with -D_FILE_OFFSET_BITS=64 but that's
+      // rather scary.
+      // Instead just truncate the file to something we can manage
+      if (truncate(path, 0) == -1) {
+        PLOG(ERROR) << "Unable to truncate " << path;
+      } else {
+        LOG(ERROR) << "Truncated " << path << " due to EFBIG error";
+      }
+    } else {
+      PLOG(ERROR) << "Unable to open " << path;
+    }
+    return;
+  }
+
+  if (fstat(fd, &statbuf) == -1) {
+    PLOG(ERROR) << "Unable to fstat()";
+    goto out_close_fd;
+  }
+
+  // See if the path refers to a regular file bigger than the
+  // specified limit
+  if (!S_ISREG(statbuf.st_mode)) goto out_close_fd;
+  if (statbuf.st_size <= limit)  goto out_close_fd;
+  if (statbuf.st_size <= keep) goto out_close_fd;
+
+  // This log file is too large - we need to truncate it
+  LOG(INFO) << "Truncating " << path << " to " << keep << " bytes";
+
+  // Copy the last "keep" bytes of the file to the beginning of the file
+  read_offset = statbuf.st_size - keep;
+  write_offset = 0;
+  int bytesin, bytesout;
+  while ((bytesin = pread(fd, copybuf, sizeof(copybuf), read_offset)) > 0) {
+    bytesout = pwrite(fd, copybuf, bytesin, write_offset);
+    if (bytesout == -1) {
+      PLOG(ERROR) << "Unable to write to " << path;
+      break;
+    } else if (bytesout != bytesin) {
+      LOG(ERROR) << "Expected to write " << bytesin << ", wrote " << bytesout;
+    }
+    read_offset += bytesin;
+    write_offset += bytesout;
+  }
+  if (bytesin == -1) PLOG(ERROR) << "Unable to read from " << path;
+
+  // Truncate the remainder of the file. If someone else writes to the
+  // end of the file after our last read() above, we lose their latest
+  // data. Too bad ...
+  if (ftruncate(fd, write_offset) == -1) {
+    PLOG(ERROR) << "Unable to truncate " << path;
+  }
+
+ out_close_fd:
+  close(fd);
+#else
+  LOG(ERROR) << "No log truncation support.";
+#endif
+}
+
+void TruncateStdoutStderr() {
+#ifdef HAVE_UNISTD_H
+  int64 limit = MaxLogSize() << 20;
+  int64 keep = 1 << 20;
+  TruncateLogFile("/proc/self/fd/1", limit, keep);
+  TruncateLogFile("/proc/self/fd/2", limit, keep);
+#else
+  LOG(ERROR) << "No log truncation support.";
+#endif
+}
+
+
+// Helper functions for string comparisons.
+#define DEFINE_CHECK_STROP_IMPL(name, func, expected)                   \
+  string* Check##func##expected##Impl(const char* s1, const char* s2,   \
+                                      const char* names) {              \
+    bool equal = s1 == s2 || (s1 && s2 && !func(s1, s2));               \
+    if (equal == expected) return NULL;                                 \
+    else {                                                              \
+      ostringstream ss;                                                 \
+      if (!s1) s1 = "";                                                 \
+      if (!s2) s2 = "";                                                 \
+      ss << #name " failed: " << names << " (" << s1 << " vs. " << s2 << ")"; \
+      return new string(ss.str());                                      \
+    }                                                                   \
+  }
+DEFINE_CHECK_STROP_IMPL(CHECK_STREQ, strcmp, true)
+DEFINE_CHECK_STROP_IMPL(CHECK_STRNE, strcmp, false)
+DEFINE_CHECK_STROP_IMPL(CHECK_STRCASEEQ, strcasecmp, true)
+DEFINE_CHECK_STROP_IMPL(CHECK_STRCASENE, strcasecmp, false)
+#undef DEFINE_CHECK_STROP_IMPL
+
+int posix_strerror_r(int err, char *buf, size_t len) {
+  // Sanity check input parameters
+  if (buf == NULL || len <= 0) {
+    errno = EINVAL;
+    return -1;
+  }
+
+  // Reset buf and errno, and try calling whatever version of strerror_r()
+  // is implemented by glibc
+  buf[0] = '\000';
+  int old_errno = errno;
+  errno = 0;
+  char *rc = reinterpret_cast<char *>(strerror_r(err, buf, len));
+
+  // Both versions set errno on failure
+  if (errno) {
+    // Should already be there, but better safe than sorry
+    buf[0]     = '\000';
+    return -1;
+  }
+  errno = old_errno;
+
+  // POSIX is vague about whether the string will be terminated, although
+  // is indirectly implies that typically ERANGE will be returned, instead
+  // of truncating the string. This is different from the GNU implementation.
+  // We play it safe by always terminating the string explicitly.
+  buf[len-1] = '\000';
+
+  // If the function succeeded, we can use its exit code to determine the
+  // semantics implemented by glibc
+  if (!rc) {
+    return 0;
+  } else {
+    // GNU semantics detected
+    if (rc == buf) {
+      return 0;
+    } else {
+      buf[0] = '\000';
+#if defined(OS_MACOSX) || defined(OS_FREEBSD) || defined(OS_OPENBSD)
+      if (reinterpret_cast<intptr_t>(rc) < sys_nerr) {
+        // This means an error on MacOSX or FreeBSD.
+        return -1;
+      }
+#endif
+      strncat(buf, rc, len-1);
+      return 0;
+    }
+  }
+}
+
+string StrError(int err) {
+  char buf[100];
+  int rc = posix_strerror_r(err, buf, sizeof(buf));
+  if ((rc < 0) || (buf[0] == '\000')) {
+    snprintf(buf, sizeof(buf), "Error number %d", err);
+  }
+  return buf;
+}
+
+LogMessageFatal::LogMessageFatal(const char* file, int line) :
+    LogMessage(file, line, GLOG_FATAL) {}
+
+LogMessageFatal::LogMessageFatal(const char* file, int line,
+                                 const CheckOpString& result) :
+    LogMessage(file, line, result) {}
+
+LogMessageFatal::~LogMessageFatal() {
+    Flush();
+    LogMessage::Fail();
+}
+
+namespace base {
+
+CheckOpMessageBuilder::CheckOpMessageBuilder(const char *exprtext)
+    : stream_(new ostringstream) {
+  *stream_ << exprtext << " (";
+}
+
+CheckOpMessageBuilder::~CheckOpMessageBuilder() {
+  delete stream_;
+}
+
+ostream* CheckOpMessageBuilder::ForVar2() {
+  *stream_ << " vs. ";
+  return stream_;
+}
+
+string* CheckOpMessageBuilder::NewString() {
+  *stream_ << ")";
+  return new string(stream_->str());
+}
+
+}  // namespace base
+
+template <>
+void MakeCheckOpValueString(std::ostream* os, const char& v) {
+  if (v >= 32 && v <= 126) {
+    (*os) << "'" << v << "'";
+  } else {
+    (*os) << "char value " << (short)v;
+  }
+}
+
+template <>
+void MakeCheckOpValueString(std::ostream* os, const signed char& v) {
+  if (v >= 32 && v <= 126) {
+    (*os) << "'" << v << "'";
+  } else {
+    (*os) << "signed char value " << (short)v;
+  }
+}
+
+template <>
+void MakeCheckOpValueString(std::ostream* os, const unsigned char& v) {
+  if (v >= 32 && v <= 126) {
+    (*os) << "'" << v << "'";
+  } else {
+    (*os) << "unsigned char value " << (unsigned short)v;
+  }
+}
+
+void InitGoogleLogging(const char* argv0) {
+  glog_internal_namespace_::InitGoogleLoggingUtilities(argv0);
+}
+
+void ShutdownGoogleLogging() {
+  glog_internal_namespace_::ShutdownGoogleLoggingUtilities();
+  LogDestination::DeleteLogDestinations();
+  delete logging_directories_list;
+  logging_directories_list = NULL;
+}
+
+void EnableLogCleaner(int overdue_days) {
+  log_cleaner_enabled_ = true;
+
+  // Setting overdue_days to 0 day should not be allowed!
+  // Since all logs will be deleted immediately, which will cause troubles.
+  if (overdue_days > 0) {
+    log_cleaner_overdue_days_ = overdue_days;
+  }
+}
+
+void DisableLogCleaner() {
+  log_cleaner_enabled_ = false;
+}
+
+_END_GOOGLE_NAMESPACE_
diff --git a/src/logging_striplog_test.sh b/src/logging_striplog_test.sh
new file mode 100755
index 000000000000..73492bda7a77
--- /dev/null
+++ b/src/logging_striplog_test.sh
@@ -0,0 +1,79 @@
+#! /bin/sh
+#
+# Copyright (c) 2007, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#
+# Author: Sergey Ioffe
+
+get_strings () {
+    if test -e ".libs/$1"; then
+        binary=".libs/$1"
+    elif test -e "$1.exe"; then
+        binary="$1.exe"
+    else
+        echo "We coundn't find $1 binary."
+        exit 1
+    fi
+    
+    strings -n 10 $binary | sort | awk '/TESTMESSAGE/ {printf "%s ", $2}'
+}
+
+# Die if "$1" != "$2", print $3 as death reason
+check_eq () {
+    if [ "$1" != "$2" ]; then
+        echo "Check failed: '$1' == '$2' ${3:+ ($3)}"
+        exit 1
+    fi
+}
+
+die () {
+    echo $1
+    exit 1
+}
+
+# Check that the string literals are appropriately stripped. This will
+# not be the case in debug mode.
+
+mode=`GLOG_check_mode=1 ./logging_striptest0 2> /dev/null`
+if [ "$mode" = "opt" ];
+then
+    echo "In OPT mode"
+    check_eq "`get_strings logging_striptest0`" "COND ERROR FATAL INFO USAGE WARNING "
+    check_eq "`get_strings logging_striptest2`" "COND ERROR FATAL USAGE "
+    check_eq "`get_strings logging_striptest10`" "" 
+else
+    echo "In DBG mode; not checking strings"
+fi
+
+# Check that LOG(FATAL) aborts even for large STRIP_LOG
+
+./logging_striptest2 2>/dev/null && die "Did not abort for STRIP_LOG=2"
+./logging_striptest10 2>/dev/null && die "Did not abort for STRIP_LOG=10"
+
+echo "PASS"
diff --git a/src/logging_striptest10.cc b/src/logging_striptest10.cc
new file mode 100644
index 000000000000..f6e1078f39a2
--- /dev/null
+++ b/src/logging_striptest10.cc
@@ -0,0 +1,35 @@
+// Copyright (c) 2007, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Author: Sergey Ioffe
+
+#define GOOGLE_STRIP_LOG 10
+
+// Include the actual test.
+#include "logging_striptest_main.cc"
diff --git a/src/logging_striptest2.cc b/src/logging_striptest2.cc
new file mode 100644
index 000000000000..a64685c9e5cd
--- /dev/null
+++ b/src/logging_striptest2.cc
@@ -0,0 +1,35 @@
+// Copyright (c) 2007, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Author: Sergey Ioffe
+
+#define GOOGLE_STRIP_LOG 2
+
+// Include the actual test.
+#include "logging_striptest_main.cc"
diff --git a/src/logging_striptest_main.cc b/src/logging_striptest_main.cc
new file mode 100644
index 000000000000..2fb91272a7b1
--- /dev/null
+++ b/src/logging_striptest_main.cc
@@ -0,0 +1,73 @@
+// Copyright (c) 2007, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Author: Sergey Ioffe
+
+// The common part of the striplog tests.
+
+#include <stdio.h>
+#include <string>
+#include <iosfwd>
+#include "glog/logging.h"
+#include "base/commandlineflags.h"
+#include "config.h"
+
+DECLARE_bool(logtostderr);
+GLOG_DEFINE_bool(check_mode, false, "Prints 'opt' or 'dbg'");
+
+using std::string;
+using namespace GOOGLE_NAMESPACE;
+
+int CheckNoReturn(bool b) {
+  string s;
+  if (b) {
+    LOG(FATAL) << "Fatal";
+  } else {
+    return 0;
+  }
+}
+
+struct A { };
+std::ostream &operator<<(std::ostream &str, const A&) {return str;}
+
+int main(int, char* argv[]) {
+  FLAGS_logtostderr = true;
+  InitGoogleLogging(argv[0]);
+  if (FLAGS_check_mode) {
+    printf("%s\n", DEBUG_MODE ? "dbg" : "opt");
+    return 0;
+  }
+  LOG(INFO) << "TESTMESSAGE INFO";
+  LOG(WARNING) << 2 << "something" << "TESTMESSAGE WARNING"
+               << 1 << 'c' << A() << std::endl;
+  LOG(ERROR) << "TESTMESSAGE ERROR";
+  bool flag = true;
+  (flag ? LOG(INFO) : LOG(ERROR)) << "TESTMESSAGE COND";
+  LOG(FATAL) << "TESTMESSAGE FATAL";
+}
diff --git a/src/logging_unittest.cc b/src/logging_unittest.cc
new file mode 100644
index 000000000000..73d426b878d7
--- /dev/null
+++ b/src/logging_unittest.cc
@@ -0,0 +1,1348 @@
+// Copyright (c) 2002, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Author: Ray Sidney
+
+#include "config_for_unittests.h"
+#include "utilities.h"
+
+#include <fcntl.h>
+#ifdef HAVE_GLOB_H
+# include <glob.h>
+#endif
+#include <sys/stat.h>
+#ifdef HAVE_UNISTD_H
+# include <unistd.h>
+#endif
+#ifdef HAVE_SYS_WAIT_H
+# include <sys/wait.h>
+#endif
+
+#include <iomanip>
+#include <iostream>
+#include <fstream>
+#include <memory>
+#include <queue>
+#include <sstream>
+#include <string>
+#include <vector>
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "base/commandlineflags.h"
+#include "glog/logging.h"
+#include "glog/raw_logging.h"
+#include "googletest.h"
+
+DECLARE_string(log_backtrace_at);  // logging.cc
+
+#ifdef HAVE_LIB_GFLAGS
+#include <gflags/gflags.h>
+using namespace GFLAGS_NAMESPACE;
+#endif
+
+#ifdef HAVE_LIB_GMOCK
+#include <gmock/gmock.h>
+#include "mock-log.h"
+// Introduce several symbols from gmock.
+using testing::_;
+using testing::AnyNumber;
+using testing::HasSubstr;
+using testing::AllOf;
+using testing::StrNe;
+using testing::StrictMock;
+using testing::InitGoogleMock;
+using GOOGLE_NAMESPACE::glog_testing::ScopedMockLog;
+#endif
+
+using namespace std;
+using namespace GOOGLE_NAMESPACE;
+
+// Some non-advertised functions that we want to test or use.
+_START_GOOGLE_NAMESPACE_
+namespace base {
+namespace internal {
+bool GetExitOnDFatal();
+void SetExitOnDFatal(bool value);
+}  // namespace internal
+}  // namespace base
+_END_GOOGLE_NAMESPACE_
+
+static void TestLogging(bool check_counts);
+static void TestRawLogging();
+static void LogWithLevels(int v, int severity, bool err, bool alsoerr);
+static void TestLoggingLevels();
+static void TestLogString();
+static void TestLogSink();
+static void TestLogToString();
+static void TestLogSinkWaitTillSent();
+static void TestCHECK();
+static void TestDCHECK();
+static void TestSTREQ();
+static void TestBasename();
+static void TestBasenameAppendWhenNoTimestamp();
+static void TestTwoProcessesWrite();
+static void TestSymlink();
+static void TestExtension();
+static void TestWrapper();
+static void TestErrno();
+static void TestTruncate();
+static void TestCustomLoggerDeletionOnShutdown();
+
+static int x = -1;
+static void BM_Check1(int n) {
+  while (n-- > 0) {
+    CHECK_GE(n, x);
+    CHECK_GE(n, x);
+    CHECK_GE(n, x);
+    CHECK_GE(n, x);
+    CHECK_GE(n, x);
+    CHECK_GE(n, x);
+    CHECK_GE(n, x);
+    CHECK_GE(n, x);
+  }
+}
+BENCHMARK(BM_Check1);
+
+static void CheckFailure(int a, int b, const char* file, int line, const char* msg);
+static void BM_Check3(int n) {
+  while (n-- > 0) {
+    if (n < x) CheckFailure(n, x, __FILE__, __LINE__, "n < x");
+    if (n < x) CheckFailure(n, x, __FILE__, __LINE__, "n < x");
+    if (n < x) CheckFailure(n, x, __FILE__, __LINE__, "n < x");
+    if (n < x) CheckFailure(n, x, __FILE__, __LINE__, "n < x");
+    if (n < x) CheckFailure(n, x, __FILE__, __LINE__, "n < x");
+    if (n < x) CheckFailure(n, x, __FILE__, __LINE__, "n < x");
+    if (n < x) CheckFailure(n, x, __FILE__, __LINE__, "n < x");
+    if (n < x) CheckFailure(n, x, __FILE__, __LINE__, "n < x");
+  }
+}
+BENCHMARK(BM_Check3);
+
+static void BM_Check2(int n) {
+  if (n == 17) {
+    x = 5;
+  }
+  while (n-- > 0) {
+    CHECK(n >= x);
+    CHECK(n >= x);
+    CHECK(n >= x);
+    CHECK(n >= x);
+    CHECK(n >= x);
+    CHECK(n >= x);
+    CHECK(n >= x);
+    CHECK(n >= x);
+  }
+}
+BENCHMARK(BM_Check2);
+
+static void CheckFailure(int, int, const char* /* file */, int /* line */,
+                         const char* /* msg */) {
+}
+
+static void BM_logspeed(int n) {
+  while (n-- > 0) {
+    LOG(INFO) << "test message";
+  }
+}
+BENCHMARK(BM_logspeed);
+
+static void BM_vlog(int n) {
+  while (n-- > 0) {
+    VLOG(1) << "test message";
+  }
+}
+BENCHMARK(BM_vlog);
+
+int main(int argc, char **argv) {
+  FLAGS_colorlogtostderr = false;
+  FLAGS_timestamp_in_logfile_name = true;
+#ifdef HAVE_LIB_GFLAGS
+  ParseCommandLineFlags(&argc, &argv, true);
+#endif
+  // Make sure stderr is not buffered as stderr seems to be buffered
+  // on recent windows.
+  setbuf(stderr, NULL);
+
+  // Test some basics before InitGoogleLogging:
+  CaptureTestStderr();
+  LogWithLevels(FLAGS_v, FLAGS_stderrthreshold,
+                FLAGS_logtostderr, FLAGS_alsologtostderr);
+  LogWithLevels(0, 0, 0, 0);  // simulate "before global c-tors"
+  const string early_stderr = GetCapturedTestStderr();
+
+  InitGoogleLogging(argv[0]);
+
+  RunSpecifiedBenchmarks();
+
+  FLAGS_logtostderr = true;
+
+  InitGoogleTest(&argc, argv);
+#ifdef HAVE_LIB_GMOCK
+  InitGoogleMock(&argc, argv);
+#endif
+
+  // so that death tests run before we use threads
+  CHECK_EQ(RUN_ALL_TESTS(), 0);
+
+  CaptureTestStderr();
+
+  // re-emit early_stderr
+  LogMessage("dummy", LogMessage::kNoLogPrefix, GLOG_INFO).stream() << early_stderr;
+
+  TestLogging(true);
+  TestRawLogging();
+  TestLoggingLevels();
+  TestLogString();
+  TestLogSink();
+  TestLogToString();
+  TestLogSinkWaitTillSent();
+  TestCHECK();
+  TestDCHECK();
+  TestSTREQ();
+
+  // TODO: The golden test portion of this test is very flakey.
+  EXPECT_TRUE(
+      MungeAndDiffTestStderr(FLAGS_test_srcdir + "/src/logging_unittest.err"));
+
+  FLAGS_logtostderr = false;
+
+  TestBasename();
+  TestBasenameAppendWhenNoTimestamp();
+  TestTwoProcessesWrite();
+  TestSymlink();
+  TestExtension();
+  TestWrapper();
+  TestErrno();
+  TestTruncate();
+  TestCustomLoggerDeletionOnShutdown();
+
+  fprintf(stdout, "PASS\n");
+  return 0;
+}
+
+void TestLogging(bool check_counts) {
+  int64 base_num_infos   = LogMessage::num_messages(GLOG_INFO);
+  int64 base_num_warning = LogMessage::num_messages(GLOG_WARNING);
+  int64 base_num_errors  = LogMessage::num_messages(GLOG_ERROR);
+
+  LOG(INFO) << string("foo ") << "bar " << 10 << ' ' << 3.4;
+  for ( int i = 0; i < 10; ++i ) {
+    int old_errno = errno;
+    errno = i;
+    PLOG_EVERY_N(ERROR, 2) << "Plog every 2, iteration " << COUNTER;
+    errno = old_errno;
+
+    LOG_EVERY_N(ERROR, 3) << "Log every 3, iteration " << COUNTER << endl;
+    LOG_EVERY_N(ERROR, 4) << "Log every 4, iteration " << COUNTER << endl;
+
+    LOG_IF_EVERY_N(WARNING, true, 5) << "Log if every 5, iteration " << COUNTER;
+    LOG_IF_EVERY_N(WARNING, false, 3)
+        << "Log if every 3, iteration " << COUNTER;
+    LOG_IF_EVERY_N(INFO, true, 1) << "Log if every 1, iteration " << COUNTER;
+    LOG_IF_EVERY_N(ERROR, (i < 3), 2)
+        << "Log if less than 3 every 2, iteration " << COUNTER;
+  }
+  LOG_IF(WARNING, true) << "log_if this";
+  LOG_IF(WARNING, false) << "don't log_if this";
+
+  char s[] = "array";
+  LOG(INFO) << s;
+  const char const_s[] = "const array";
+  LOG(INFO) << const_s;
+  int j = 1000;
+  LOG(ERROR) << string("foo") << ' '<< j << ' ' << setw(10) << j << " "
+             << setw(1) << hex << j;
+
+  {
+    google::LogMessage outer(__FILE__, __LINE__, GLOG_ERROR);
+    outer.stream() << "outer";
+
+    LOG(ERROR) << "inner";
+  }
+
+  LogMessage("foo", LogMessage::kNoLogPrefix, GLOG_INFO).stream() << "no prefix";
+
+  if (check_counts) {
+    CHECK_EQ(base_num_infos   + 14, LogMessage::num_messages(GLOG_INFO));
+    CHECK_EQ(base_num_warning + 3,  LogMessage::num_messages(GLOG_WARNING));
+    CHECK_EQ(base_num_errors  + 17, LogMessage::num_messages(GLOG_ERROR));
+  }
+}
+
+static void NoAllocNewHook() {
+  LOG(FATAL) << "unexpected new";
+}
+
+struct NewHook {
+  NewHook() {
+    g_new_hook = &NoAllocNewHook;
+  }
+  ~NewHook() {
+    g_new_hook = NULL;
+  }
+};
+
+TEST(DeathNoAllocNewHook, logging) {
+  // tests that NewHook used below works
+  NewHook new_hook;
+  ASSERT_DEATH({
+    new int;
+  }, "unexpected new");
+}
+
+void TestRawLogging() {
+  string* foo = new string("foo ");
+  string huge_str(50000, 'a');
+
+  FlagSaver saver;
+
+  // Check that RAW loggging does not use mallocs.
+  NewHook new_hook;
+
+  RAW_LOG(INFO, "%s%s%d%c%f", foo->c_str(), "bar ", 10, ' ', 3.4);
+  char s[] = "array";
+  RAW_LOG(WARNING, "%s", s);
+  const char const_s[] = "const array";
+  RAW_LOG(INFO, "%s", const_s);
+  void* p = reinterpret_cast<void*>(PTR_TEST_VALUE);
+  RAW_LOG(INFO, "ptr %p", p);
+  p = NULL;
+  RAW_LOG(INFO, "ptr %p", p);
+  int j = 1000;
+  RAW_LOG(ERROR, "%s%d%c%010d%s%1x", foo->c_str(), j, ' ', j, " ", j);
+  RAW_VLOG(0, "foo %d", j);
+
+#ifdef NDEBUG
+  RAW_LOG(INFO, "foo %d", j);  // so that have same stderr to compare
+#else
+  RAW_DLOG(INFO, "foo %d", j);  // test RAW_DLOG in debug mode
+#endif
+
+  // test how long messages are chopped:
+  RAW_LOG(WARNING, "Huge string: %s", huge_str.c_str());
+  RAW_VLOG(0, "Huge string: %s", huge_str.c_str());
+
+  FLAGS_v = 0;
+  RAW_LOG(INFO, "log");
+  RAW_VLOG(0, "vlog 0 on");
+  RAW_VLOG(1, "vlog 1 off");
+  RAW_VLOG(2, "vlog 2 off");
+  RAW_VLOG(3, "vlog 3 off");
+  FLAGS_v = 2;
+  RAW_LOG(INFO, "log");
+  RAW_VLOG(1, "vlog 1 on");
+  RAW_VLOG(2, "vlog 2 on");
+  RAW_VLOG(3, "vlog 3 off");
+
+#ifdef NDEBUG
+  RAW_DCHECK(1 == 2, " RAW_DCHECK's shouldn't be compiled in normal mode");
+#endif
+
+  RAW_CHECK(1 == 1, "should be ok");
+  RAW_DCHECK(true, "should be ok");
+
+  delete foo;
+}
+
+void LogWithLevels(int v, int severity, bool err, bool alsoerr) {
+  RAW_LOG(INFO,
+          "Test: v=%d stderrthreshold=%d logtostderr=%d alsologtostderr=%d",
+          v, severity, err, alsoerr);
+
+  FlagSaver saver;
+
+  FLAGS_v = v;
+  FLAGS_stderrthreshold = severity;
+  FLAGS_logtostderr = err;
+  FLAGS_alsologtostderr = alsoerr;
+
+  RAW_VLOG(-1, "vlog -1");
+  RAW_VLOG(0, "vlog 0");
+  RAW_VLOG(1, "vlog 1");
+  RAW_LOG(INFO, "log info");
+  RAW_LOG(WARNING, "log warning");
+  RAW_LOG(ERROR, "log error");
+
+  VLOG(-1) << "vlog -1";
+  VLOG(0) << "vlog 0";
+  VLOG(1) << "vlog 1";
+  LOG(INFO) << "log info";
+  LOG(WARNING) << "log warning";
+  LOG(ERROR) << "log error";
+
+  VLOG_IF(-1, true) << "vlog_if -1";
+  VLOG_IF(-1, false) << "don't vlog_if -1";
+  VLOG_IF(0, true) << "vlog_if 0";
+  VLOG_IF(0, false) << "don't vlog_if 0";
+  VLOG_IF(1, true) << "vlog_if 1";
+  VLOG_IF(1, false) << "don't vlog_if 1";
+  LOG_IF(INFO, true) << "log_if info";
+  LOG_IF(INFO, false) << "don't log_if info";
+  LOG_IF(WARNING, true) << "log_if warning";
+  LOG_IF(WARNING, false) << "don't log_if warning";
+  LOG_IF(ERROR, true) << "log_if error";
+  LOG_IF(ERROR, false) << "don't log_if error";
+
+  int c;
+  c = 1; VLOG_IF(100, c -= 2) << "vlog_if 100 expr"; EXPECT_EQ(c, -1);
+  c = 1; VLOG_IF(0, c -= 2) << "vlog_if 0 expr"; EXPECT_EQ(c, -1);
+  c = 1; LOG_IF(INFO, c -= 2) << "log_if info expr"; EXPECT_EQ(c, -1);
+  c = 1; LOG_IF(ERROR, c -= 2) << "log_if error expr"; EXPECT_EQ(c, -1);
+  c = 2; VLOG_IF(0, c -= 2) << "don't vlog_if 0 expr"; EXPECT_EQ(c, 0);
+  c = 2; LOG_IF(ERROR, c -= 2) << "don't log_if error expr"; EXPECT_EQ(c, 0);
+
+  c = 3; LOG_IF_EVERY_N(INFO, c -= 4, 1) << "log_if info every 1 expr";
+  EXPECT_EQ(c, -1);
+  c = 3; LOG_IF_EVERY_N(ERROR, c -= 4, 1) << "log_if error every 1 expr";
+  EXPECT_EQ(c, -1);
+  c = 4; LOG_IF_EVERY_N(ERROR, c -= 4, 3) << "don't log_if info every 3 expr";
+  EXPECT_EQ(c, 0);
+  c = 4; LOG_IF_EVERY_N(ERROR, c -= 4, 3) << "don't log_if error every 3 expr";
+  EXPECT_EQ(c, 0);
+  c = 5; VLOG_IF_EVERY_N(0, c -= 4, 1) << "vlog_if 0 every 1 expr";
+  EXPECT_EQ(c, 1);
+  c = 5; VLOG_IF_EVERY_N(100, c -= 4, 3) << "vlog_if 100 every 3 expr";
+  EXPECT_EQ(c, 1);
+  c = 6; VLOG_IF_EVERY_N(0, c -= 6, 1) << "don't vlog_if 0 every 1 expr";
+  EXPECT_EQ(c, 0);
+  c = 6; VLOG_IF_EVERY_N(100, c -= 6, 3) << "don't vlog_if 100 every 1 expr";
+  EXPECT_EQ(c, 0);
+}
+
+void TestLoggingLevels() {
+  LogWithLevels(0, GLOG_INFO, false, false);
+  LogWithLevels(1, GLOG_INFO, false, false);
+  LogWithLevels(-1, GLOG_INFO, false, false);
+  LogWithLevels(0, GLOG_WARNING, false, false);
+  LogWithLevels(0, GLOG_ERROR, false, false);
+  LogWithLevels(0, GLOG_FATAL, false, false);
+  LogWithLevels(0, GLOG_FATAL, true, false);
+  LogWithLevels(0, GLOG_FATAL, false, true);
+  LogWithLevels(1, GLOG_WARNING, false, false);
+  LogWithLevels(1, GLOG_FATAL, false, true);
+}
+
+TEST(DeathRawCHECK, logging) {
+  ASSERT_DEATH(RAW_CHECK(false, "failure 1"),
+               "RAW: Check false failed: failure 1");
+  ASSERT_DEBUG_DEATH(RAW_DCHECK(1 == 2, "failure 2"),
+               "RAW: Check 1 == 2 failed: failure 2");
+}
+
+void TestLogString() {
+  vector<string> errors;
+  vector<string> *no_errors = NULL;
+
+  LOG_STRING(INFO, &errors) << "LOG_STRING: " << "collected info";
+  LOG_STRING(WARNING, &errors) << "LOG_STRING: " << "collected warning";
+  LOG_STRING(ERROR, &errors) << "LOG_STRING: " << "collected error";
+
+  LOG_STRING(INFO, no_errors) << "LOG_STRING: " << "reported info";
+  LOG_STRING(WARNING, no_errors) << "LOG_STRING: " << "reported warning";
+  LOG_STRING(ERROR, NULL) << "LOG_STRING: " << "reported error";
+
+  for (size_t i = 0; i < errors.size(); ++i) {
+    LOG(INFO) << "Captured by LOG_STRING:  " << errors[i];
+  }
+}
+
+void TestLogToString() {
+  string error;
+  string* no_error = NULL;
+
+  LOG_TO_STRING(INFO, &error) << "LOG_TO_STRING: " << "collected info";
+  LOG(INFO) << "Captured by LOG_TO_STRING:  " << error;
+  LOG_TO_STRING(WARNING, &error) << "LOG_TO_STRING: " << "collected warning";
+  LOG(INFO) << "Captured by LOG_TO_STRING:  " << error;
+  LOG_TO_STRING(ERROR, &error) << "LOG_TO_STRING: " << "collected error";
+  LOG(INFO) << "Captured by LOG_TO_STRING:  " << error;
+
+  LOG_TO_STRING(INFO, no_error) << "LOG_TO_STRING: " << "reported info";
+  LOG_TO_STRING(WARNING, no_error) << "LOG_TO_STRING: " << "reported warning";
+  LOG_TO_STRING(ERROR, NULL) << "LOG_TO_STRING: " << "reported error";
+}
+
+class TestLogSinkImpl : public LogSink {
+ public:
+  vector<string> errors;
+  virtual void send(LogSeverity severity, const char* /* full_filename */,
+                    const char* base_filename, int line,
+                    const struct tm* tm_time,
+                    const char* message, size_t message_len, int usecs) {
+    errors.push_back(
+      ToString(severity, base_filename, line, tm_time, message, message_len, usecs));
+  }
+  virtual void send(LogSeverity severity, const char* full_filename,
+                    const char* base_filename, int line,
+                    const struct tm* tm_time,
+                    const char* message, size_t message_len) {
+    send(severity, full_filename, base_filename, line,
+         tm_time, message, message_len, 0);
+  }
+};
+
+void TestLogSink() {
+  TestLogSinkImpl sink;
+  LogSink *no_sink = NULL;
+
+  LOG_TO_SINK(&sink, INFO) << "LOG_TO_SINK: " << "collected info";
+  LOG_TO_SINK(&sink, WARNING) << "LOG_TO_SINK: " << "collected warning";
+  LOG_TO_SINK(&sink, ERROR) << "LOG_TO_SINK: " << "collected error";
+
+  LOG_TO_SINK(no_sink, INFO) << "LOG_TO_SINK: " << "reported info";
+  LOG_TO_SINK(no_sink, WARNING) << "LOG_TO_SINK: " << "reported warning";
+  LOG_TO_SINK(NULL, ERROR) << "LOG_TO_SINK: " << "reported error";
+
+  LOG_TO_SINK_BUT_NOT_TO_LOGFILE(&sink, INFO)
+      << "LOG_TO_SINK_BUT_NOT_TO_LOGFILE: " << "collected info";
+  LOG_TO_SINK_BUT_NOT_TO_LOGFILE(&sink, WARNING)
+      << "LOG_TO_SINK_BUT_NOT_TO_LOGFILE: " << "collected warning";
+  LOG_TO_SINK_BUT_NOT_TO_LOGFILE(&sink, ERROR)
+      << "LOG_TO_SINK_BUT_NOT_TO_LOGFILE: " << "collected error";
+
+  LOG_TO_SINK_BUT_NOT_TO_LOGFILE(no_sink, INFO)
+      << "LOG_TO_SINK_BUT_NOT_TO_LOGFILE: " << "thrashed info";
+  LOG_TO_SINK_BUT_NOT_TO_LOGFILE(no_sink, WARNING)
+      << "LOG_TO_SINK_BUT_NOT_TO_LOGFILE: " << "thrashed warning";
+  LOG_TO_SINK_BUT_NOT_TO_LOGFILE(NULL, ERROR)
+      << "LOG_TO_SINK_BUT_NOT_TO_LOGFILE: " << "thrashed error";
+
+  LOG(INFO) << "Captured by LOG_TO_SINK:";
+  for (size_t i = 0; i < sink.errors.size(); ++i) {
+    LogMessage("foo", LogMessage::kNoLogPrefix, GLOG_INFO).stream()
+      << sink.errors[i];
+  }
+}
+
+// For testing using CHECK*() on anonymous enums.
+enum {
+  CASE_A,
+  CASE_B
+};
+
+void TestCHECK() {
+  // Tests using CHECK*() on int values.
+  CHECK(1 == 1);
+  CHECK_EQ(1, 1);
+  CHECK_NE(1, 2);
+  CHECK_GE(1, 1);
+  CHECK_GE(2, 1);
+  CHECK_LE(1, 1);
+  CHECK_LE(1, 2);
+  CHECK_GT(2, 1);
+  CHECK_LT(1, 2);
+
+  // Tests using CHECK*() on anonymous enums.
+  // Apple's GCC doesn't like this.
+#if !defined(OS_MACOSX)
+  CHECK_EQ(CASE_A, CASE_A);
+  CHECK_NE(CASE_A, CASE_B);
+  CHECK_GE(CASE_A, CASE_A);
+  CHECK_GE(CASE_B, CASE_A);
+  CHECK_LE(CASE_A, CASE_A);
+  CHECK_LE(CASE_A, CASE_B);
+  CHECK_GT(CASE_B, CASE_A);
+  CHECK_LT(CASE_A, CASE_B);
+#endif
+}
+
+void TestDCHECK() {
+#ifdef NDEBUG
+  DCHECK( 1 == 2 ) << " DCHECK's shouldn't be compiled in normal mode";
+#endif
+  DCHECK( 1 == 1 );
+  DCHECK_EQ(1, 1);
+  DCHECK_NE(1, 2);
+  DCHECK_GE(1, 1);
+  DCHECK_GE(2, 1);
+  DCHECK_LE(1, 1);
+  DCHECK_LE(1, 2);
+  DCHECK_GT(2, 1);
+  DCHECK_LT(1, 2);
+
+  int64* orig_ptr = new int64;
+  int64* ptr = DCHECK_NOTNULL(orig_ptr);
+  CHECK_EQ(ptr, orig_ptr);
+  delete orig_ptr;
+}
+
+void TestSTREQ() {
+  CHECK_STREQ("this", "this");
+  CHECK_STREQ(NULL, NULL);
+  CHECK_STRCASEEQ("this", "tHiS");
+  CHECK_STRCASEEQ(NULL, NULL);
+  CHECK_STRNE("this", "tHiS");
+  CHECK_STRNE("this", NULL);
+  CHECK_STRCASENE("this", "that");
+  CHECK_STRCASENE(NULL, "that");
+  CHECK_STREQ((string("a")+"b").c_str(), "ab");
+  CHECK_STREQ(string("test").c_str(),
+              (string("te") + string("st")).c_str());
+}
+
+TEST(DeathSTREQ, logging) {
+  ASSERT_DEATH(CHECK_STREQ(NULL, "this"), "");
+  ASSERT_DEATH(CHECK_STREQ("this", "siht"), "");
+  ASSERT_DEATH(CHECK_STRCASEEQ(NULL, "siht"), "");
+  ASSERT_DEATH(CHECK_STRCASEEQ("this", "siht"), "");
+  ASSERT_DEATH(CHECK_STRNE(NULL, NULL), "");
+  ASSERT_DEATH(CHECK_STRNE("this", "this"), "");
+  ASSERT_DEATH(CHECK_STREQ((string("a")+"b").c_str(), "abc"), "");
+}
+
+TEST(CheckNOTNULL, Simple) {
+  int64 t;
+  void *ptr = static_cast<void *>(&t);
+  void *ref = CHECK_NOTNULL(ptr);
+  EXPECT_EQ(ptr, ref);
+  CHECK_NOTNULL(reinterpret_cast<char *>(ptr));
+  CHECK_NOTNULL(reinterpret_cast<unsigned char *>(ptr));
+  CHECK_NOTNULL(reinterpret_cast<int *>(ptr));
+  CHECK_NOTNULL(reinterpret_cast<int64 *>(ptr));
+}
+
+TEST(DeathCheckNN, Simple) {
+  ASSERT_DEATH(CHECK_NOTNULL(static_cast<void *>(NULL)), "");
+}
+
+// Get list of file names that match pattern
+static void GetFiles(const string& pattern, vector<string>* files) {
+  files->clear();
+#if defined(HAVE_GLOB_H)
+  glob_t g;
+  const int r = glob(pattern.c_str(), 0, NULL, &g);
+  CHECK((r == 0) || (r == GLOB_NOMATCH)) << ": error matching " << pattern;
+  for (size_t i = 0; i < g.gl_pathc; i++) {
+    files->push_back(string(g.gl_pathv[i]));
+  }
+  globfree(&g);
+#elif defined(OS_WINDOWS)
+  WIN32_FIND_DATAA data;
+  HANDLE handle = FindFirstFileA(pattern.c_str(), &data);
+  size_t index = pattern.rfind('\\');
+  if (index == string::npos) {
+    LOG(FATAL) << "No directory separator.";
+  }
+  const string dirname = pattern.substr(0, index + 1);
+  if (handle == INVALID_HANDLE_VALUE) {
+    // Finding no files is OK.
+    return;
+  }
+  do {
+    files->push_back(dirname + data.cFileName);
+  } while (FindNextFileA(handle, &data));
+  BOOL result = FindClose(handle);
+  LOG_SYSRESULT(result);
+#else
+# error There is no way to do glob.
+#endif
+}
+
+// Delete files patching pattern
+static void DeleteFiles(const string& pattern) {
+  vector<string> files;
+  GetFiles(pattern, &files);
+  for (size_t i = 0; i < files.size(); i++) {
+    CHECK(unlink(files[i].c_str()) == 0) << ": " << strerror(errno);
+  }
+}
+
+//check string is in file (or is *NOT*, depending on optional checkInFileOrNot)
+static void CheckFile(const string& name, const string& expected_string, const bool checkInFileOrNot = true) {
+  vector<string> files;
+  GetFiles(name + "*", &files);
+  CHECK_EQ(files.size(), 1UL);
+
+  FILE* file = fopen(files[0].c_str(), "r");
+  CHECK(file != NULL) << ": could not open " << files[0];
+  char buf[1000];
+  while (fgets(buf, sizeof(buf), file) != NULL) {
+    char* first = strstr(buf, expected_string.c_str());
+    //if first == NULL, not found.
+    //Terser than if (checkInFileOrNot && first != NULL || !check...
+    if (checkInFileOrNot != (first == NULL)) {
+      fclose(file);
+      return;
+    }
+  }
+  fclose(file);
+  LOG(FATAL) << "Did " << (checkInFileOrNot? "not " : "") << "find " << expected_string << " in " << files[0];
+}
+
+static void TestBasename() {
+  fprintf(stderr, "==== Test setting log file basename\n");
+  const string dest = FLAGS_test_tmpdir + "/logging_test_basename";
+  DeleteFiles(dest + "*");
+
+  SetLogDestination(GLOG_INFO, dest.c_str());
+  LOG(INFO) << "message to new base";
+  FlushLogFiles(GLOG_INFO);
+
+  CheckFile(dest, "message to new base");
+
+  // Release file handle for the destination file to unlock the file in Windows.
+  LogToStderr();
+  DeleteFiles(dest + "*");
+}
+
+static void TestBasenameAppendWhenNoTimestamp() {
+  fprintf(stderr, "==== Test setting log file basename without timestamp and appending properly\n");
+  const string dest = FLAGS_test_tmpdir + "/logging_test_basename_append_when_no_timestamp";
+  DeleteFiles(dest + "*");
+
+  ofstream out(dest.c_str());
+  out << "test preexisting content" << endl;
+  out.close();
+
+  CheckFile(dest, "test preexisting content");
+
+  FLAGS_timestamp_in_logfile_name=false;
+  SetLogDestination(GLOG_INFO, dest.c_str());
+  LOG(INFO) << "message to new base, appending to preexisting file";
+  FlushLogFiles(GLOG_INFO);
+  FLAGS_timestamp_in_logfile_name=true;
+
+  //if the logging overwrites the file instead of appending it will fail.
+  CheckFile(dest, "test preexisting content");
+  CheckFile(dest, "message to new base, appending to preexisting file");
+
+  // Release file handle for the destination file to unlock the file in Windows.
+  LogToStderr();
+  DeleteFiles(dest + "*");
+}
+
+static void TestTwoProcessesWrite() {
+// test only implemented for platforms with fork & wait; the actual implementation relies on flock
+#if defined(HAVE_SYS_WAIT_H) && defined(HAVE_UNISTD_H) && defined(HAVE_FCNTL)
+  fprintf(stderr, "==== Test setting log file basename and two processes writing - second should fail\n");
+  const string dest = FLAGS_test_tmpdir + "/logging_test_basename_two_processes_writing";
+  DeleteFiles(dest + "*");
+
+  //make both processes write into the same file (easier test)
+  FLAGS_timestamp_in_logfile_name=false;
+  SetLogDestination(GLOG_INFO, dest.c_str());
+  LOG(INFO) << "message to new base, parent";
+  FlushLogFiles(GLOG_INFO);
+
+  pid_t pid = fork();
+  CHECK_ERR(pid);
+  if (pid == 0) {
+    LOG(INFO) << "message to new base, child - should only appear on STDERR not on the file";
+    ShutdownGoogleLogging(); //for children proc
+    exit(0);
+  } else if (pid > 0) {
+    wait(NULL);
+  }
+  FLAGS_timestamp_in_logfile_name=true;
+
+  CheckFile(dest, "message to new base, parent");
+  CheckFile(dest, "message to new base, child - should only appear on STDERR not on the file", false);
+
+  // Release
+  LogToStderr();
+  DeleteFiles(dest + "*");
+#endif
+}
+
+static void TestSymlink() {
+#ifndef OS_WINDOWS
+  fprintf(stderr, "==== Test setting log file symlink\n");
+  string dest = FLAGS_test_tmpdir + "/logging_test_symlink";
+  string sym = FLAGS_test_tmpdir + "/symlinkbase";
+  DeleteFiles(dest + "*");
+  DeleteFiles(sym + "*");
+
+  SetLogSymlink(GLOG_INFO, "symlinkbase");
+  SetLogDestination(GLOG_INFO, dest.c_str());
+  LOG(INFO) << "message to new symlink";
+  FlushLogFiles(GLOG_INFO);
+  CheckFile(sym, "message to new symlink");
+
+  DeleteFiles(dest + "*");
+  DeleteFiles(sym + "*");
+#endif
+}
+
+static void TestExtension() {
+  fprintf(stderr, "==== Test setting log file extension\n");
+  string dest = FLAGS_test_tmpdir + "/logging_test_extension";
+  DeleteFiles(dest + "*");
+
+  SetLogDestination(GLOG_INFO, dest.c_str());
+  SetLogFilenameExtension("specialextension");
+  LOG(INFO) << "message to new extension";
+  FlushLogFiles(GLOG_INFO);
+  CheckFile(dest, "message to new extension");
+
+  // Check that file name ends with extension
+  vector<string> filenames;
+  GetFiles(dest + "*", &filenames);
+  CHECK_EQ(filenames.size(), 1UL);
+  CHECK(strstr(filenames[0].c_str(), "specialextension") != NULL);
+
+  // Release file handle for the destination file to unlock the file in Windows.
+  LogToStderr();
+  DeleteFiles(dest + "*");
+}
+
+struct MyLogger : public base::Logger {
+  string data;
+
+  virtual void Write(bool /* should_flush */,
+                     time_t /* timestamp */,
+                     const char* message,
+                     int length) {
+    data.append(message, length);
+  }
+
+  virtual void Flush() { }
+
+  virtual uint32 LogSize() { return data.length(); }
+};
+
+static void TestWrapper() {
+  fprintf(stderr, "==== Test log wrapper\n");
+
+  MyLogger my_logger;
+  base::Logger* old_logger = base::GetLogger(GLOG_INFO);
+  base::SetLogger(GLOG_INFO, &my_logger);
+  LOG(INFO) << "Send to wrapped logger";
+  FlushLogFiles(GLOG_INFO);
+  base::SetLogger(GLOG_INFO, old_logger);
+
+  CHECK(strstr(my_logger.data.c_str(), "Send to wrapped logger") != NULL);
+}
+
+static void TestErrno() {
+  fprintf(stderr, "==== Test errno preservation\n");
+
+  errno = ENOENT;
+  TestLogging(false);
+  CHECK_EQ(errno, ENOENT);
+}
+
+static void TestOneTruncate(const char *path, int64 limit, int64 keep,
+                            int64 dsize, int64 ksize, int64 expect) {
+  int fd;
+  CHECK_ERR(fd = open(path, O_RDWR | O_CREAT | O_TRUNC, 0600));
+
+  const char *discardstr = "DISCARDME!", *keepstr = "KEEPME!";
+  const size_t discard_size = strlen(discardstr), keep_size = strlen(keepstr);
+
+  // Fill the file with the requested data; first discard data, then kept data
+  int64 written = 0;
+  while (written < dsize) {
+    int bytes = min<int64>(dsize - written, discard_size);
+    CHECK_ERR(write(fd, discardstr, bytes));
+    written += bytes;
+  }
+  written = 0;
+  while (written < ksize) {
+    int bytes = min<int64>(ksize - written, keep_size);
+    CHECK_ERR(write(fd, keepstr, bytes));
+    written += bytes;
+  }
+
+  TruncateLogFile(path, limit, keep);
+
+  // File should now be shorter
+  struct stat statbuf;
+  CHECK_ERR(fstat(fd, &statbuf));
+  CHECK_EQ(statbuf.st_size, expect);
+  CHECK_ERR(lseek(fd, 0, SEEK_SET));
+
+  // File should contain the suffix of the original file
+  const size_t buf_size = statbuf.st_size + 1;
+  char* buf = new char[buf_size];
+  memset(buf, 0, buf_size);
+  CHECK_ERR(read(fd, buf, buf_size));
+
+  const char *p = buf;
+  int64 checked = 0;
+  while (checked < expect) {
+    int bytes = min<int64>(expect - checked, keep_size);
+    CHECK(!memcmp(p, keepstr, bytes));
+    checked += bytes;
+  }
+  close(fd);
+  delete[] buf;
+}
+
+static void TestTruncate() {
+#ifdef HAVE_UNISTD_H
+  fprintf(stderr, "==== Test log truncation\n");
+  string path = FLAGS_test_tmpdir + "/truncatefile";
+
+  // Test on a small file
+  TestOneTruncate(path.c_str(), 10, 10, 10, 10, 10);
+
+  // And a big file (multiple blocks to copy)
+  TestOneTruncate(path.c_str(), 2<<20, 4<<10, 3<<20, 4<<10, 4<<10);
+
+  // Check edge-case limits
+  TestOneTruncate(path.c_str(), 10, 20, 0, 20, 20);
+  TestOneTruncate(path.c_str(), 10, 0, 0, 0, 0);
+  TestOneTruncate(path.c_str(), 10, 50, 0, 10, 10);
+  TestOneTruncate(path.c_str(), 50, 100, 0, 30, 30);
+
+  // MacOSX 10.4 doesn't fail in this case.
+  // Windows doesn't have symlink.
+  // Let's just ignore this test for these cases.
+#if !defined(OS_MACOSX) && !defined(OS_WINDOWS)
+  // Through a symlink should fail to truncate
+  string linkname = path + ".link";
+  unlink(linkname.c_str());
+  CHECK_ERR(symlink(path.c_str(), linkname.c_str()));
+  TestOneTruncate(linkname.c_str(), 10, 10, 0, 30, 30);
+#endif
+
+  // The /proc/self path makes sense only for linux.
+#if defined(OS_LINUX)
+  // Through an open fd symlink should work
+  int fd;
+  CHECK_ERR(fd = open(path.c_str(), O_APPEND | O_WRONLY));
+  char fdpath[64];
+  snprintf(fdpath, sizeof(fdpath), "/proc/self/fd/%d", fd);
+  TestOneTruncate(fdpath, 10, 10, 10, 10, 10);
+#endif
+
+#endif
+}
+
+struct RecordDeletionLogger : public base::Logger {
+  RecordDeletionLogger(bool* set_on_destruction,
+                       base::Logger* wrapped_logger) :
+      set_on_destruction_(set_on_destruction),
+      wrapped_logger_(wrapped_logger)
+  {
+    *set_on_destruction_ = false;
+  }
+  virtual ~RecordDeletionLogger() {
+    *set_on_destruction_ = true;
+  }
+  virtual void Write(bool force_flush,
+                     time_t timestamp,
+                     const char* message,
+                     int length) {
+    wrapped_logger_->Write(force_flush, timestamp, message, length);
+  }
+  virtual void Flush() { wrapped_logger_->Flush(); }
+  virtual uint32 LogSize() { return wrapped_logger_->LogSize(); }
+ private:
+  bool* set_on_destruction_;
+  base::Logger* wrapped_logger_;
+};
+
+static void TestCustomLoggerDeletionOnShutdown() {
+  bool custom_logger_deleted = false;
+  base::SetLogger(GLOG_INFO,
+                  new RecordDeletionLogger(&custom_logger_deleted,
+                                           base::GetLogger(GLOG_INFO)));
+  ShutdownGoogleLogging();
+  EXPECT_TRUE(custom_logger_deleted);
+}
+
+_START_GOOGLE_NAMESPACE_
+namespace glog_internal_namespace_ {
+extern  // in logging.cc
+bool SafeFNMatch_(const char* pattern, size_t patt_len,
+                  const char* str, size_t str_len);
+} // namespace glog_internal_namespace_
+using glog_internal_namespace_::SafeFNMatch_;
+_END_GOOGLE_NAMESPACE_
+
+static bool WrapSafeFNMatch(string pattern, string str) {
+  pattern += "abc";
+  str += "defgh";
+  return SafeFNMatch_(pattern.data(), pattern.size() - 3,
+                      str.data(), str.size() - 5);
+}
+
+TEST(SafeFNMatch, logging) {
+  CHECK(WrapSafeFNMatch("foo", "foo"));
+  CHECK(!WrapSafeFNMatch("foo", "bar"));
+  CHECK(!WrapSafeFNMatch("foo", "fo"));
+  CHECK(!WrapSafeFNMatch("foo", "foo2"));
+  CHECK(WrapSafeFNMatch("bar/foo.ext", "bar/foo.ext"));
+  CHECK(WrapSafeFNMatch("*ba*r/fo*o.ext*", "bar/foo.ext"));
+  CHECK(!WrapSafeFNMatch("bar/foo.ext", "bar/baz.ext"));
+  CHECK(!WrapSafeFNMatch("bar/foo.ext", "bar/foo"));
+  CHECK(!WrapSafeFNMatch("bar/foo.ext", "bar/foo.ext.zip"));
+  CHECK(WrapSafeFNMatch("ba?/*.ext", "bar/foo.ext"));
+  CHECK(WrapSafeFNMatch("ba?/*.ext", "baZ/FOO.ext"));
+  CHECK(!WrapSafeFNMatch("ba?/*.ext", "barr/foo.ext"));
+  CHECK(!WrapSafeFNMatch("ba?/*.ext", "bar/foo.ext2"));
+  CHECK(WrapSafeFNMatch("ba?/*", "bar/foo.ext2"));
+  CHECK(WrapSafeFNMatch("ba?/*", "bar/"));
+  CHECK(!WrapSafeFNMatch("ba?/?", "bar/"));
+  CHECK(!WrapSafeFNMatch("ba?/*", "bar"));
+}
+
+// TestWaitingLogSink will save messages here
+// No lock: Accessed only by TestLogSinkWriter thread
+// and after its demise by its creator.
+static vector<string> global_messages;
+
+// helper for TestWaitingLogSink below.
+// Thread that does the logic of TestWaitingLogSink
+// It's free to use LOG() itself.
+class TestLogSinkWriter : public Thread {
+ public:
+
+  TestLogSinkWriter() : should_exit_(false) {
+    SetJoinable(true);
+    Start();
+  }
+
+  // Just buffer it (can't use LOG() here).
+  void Buffer(const string& message) {
+    mutex_.Lock();
+    RAW_LOG(INFO, "Buffering");
+    messages_.push(message);
+    mutex_.Unlock();
+    RAW_LOG(INFO, "Buffered");
+  }
+
+  // Wait for the buffer to clear (can't use LOG() here).
+  void Wait() {
+    RAW_LOG(INFO, "Waiting");
+    mutex_.Lock();
+    while (!NoWork()) {
+      mutex_.Unlock();
+      SleepForMilliseconds(1);
+      mutex_.Lock();
+    }
+    RAW_LOG(INFO, "Waited");
+    mutex_.Unlock();
+  }
+
+  // Trigger thread exit.
+  void Stop() {
+    MutexLock l(&mutex_);
+    should_exit_ = true;
+  }
+
+ private:
+
+  // helpers ---------------
+
+  // For creating a "Condition".
+  bool NoWork() { return messages_.empty(); }
+  bool HaveWork() { return !messages_.empty() || should_exit_; }
+
+  // Thread body; CAN use LOG() here!
+  virtual void Run() {
+    while (1) {
+      mutex_.Lock();
+      while (!HaveWork()) {
+        mutex_.Unlock();
+        SleepForMilliseconds(1);
+        mutex_.Lock();
+      }
+      if (should_exit_ && messages_.empty()) {
+        mutex_.Unlock();
+        break;
+      }
+      // Give the main thread time to log its message,
+      // so that we get a reliable log capture to compare to golden file.
+      // Same for the other sleep below.
+      SleepForMilliseconds(20);
+      RAW_LOG(INFO, "Sink got a messages");  // only RAW_LOG under mutex_ here
+      string message = messages_.front();
+      messages_.pop();
+      // Normally this would be some more real/involved logging logic
+      // where LOG() usage can't be eliminated,
+      // e.g. pushing the message over with an RPC:
+      int messages_left = messages_.size();
+      mutex_.Unlock();
+      SleepForMilliseconds(20);
+      // May not use LOG while holding mutex_, because Buffer()
+      // acquires mutex_, and Buffer is called from LOG(),
+      // which has its own internal mutex:
+      // LOG()->LogToSinks()->TestWaitingLogSink::send()->Buffer()
+      LOG(INFO) << "Sink is sending out a message: " << message;
+      LOG(INFO) << "Have " << messages_left << " left";
+      global_messages.push_back(message);
+    }
+  }
+
+  // data ---------------
+
+  Mutex mutex_;
+  bool should_exit_;
+  queue<string> messages_;  // messages to be logged
+};
+
+// A log sink that exercises WaitTillSent:
+// it pushes data to a buffer and wakes up another thread to do the logging
+// (that other thread can than use LOG() itself),
+class TestWaitingLogSink : public LogSink {
+ public:
+
+  TestWaitingLogSink() {
+    tid_ = pthread_self();  // for thread-specific behavior
+    AddLogSink(this);
+  }
+  ~TestWaitingLogSink() {
+    RemoveLogSink(this);
+    writer_.Stop();
+    writer_.Join();
+  }
+
+  // (re)define LogSink interface
+
+  virtual void send(LogSeverity severity, const char* /* full_filename */,
+                    const char* base_filename, int line,
+                    const struct tm* tm_time,
+                    const char* message, size_t message_len, int usecs) {
+    // Push it to Writer thread if we are the original logging thread.
+    // Note: Something like ThreadLocalLogSink is a better choice
+    //       to do thread-specific LogSink logic for real.
+    if (pthread_equal(tid_, pthread_self())) {
+      writer_.Buffer(ToString(severity, base_filename, line,
+                              tm_time, message, message_len, usecs));
+    }
+  }
+
+  virtual void send(LogSeverity severity, const char* full_filename,
+                    const char* base_filename, int line,
+                    const struct tm* tm_time,
+                    const char* message, size_t message_len) {
+    send(severity, full_filename, base_filename, line, tm_time, message, message_len);
+  }
+
+  virtual void WaitTillSent() {
+    // Wait for Writer thread if we are the original logging thread.
+    if (pthread_equal(tid_, pthread_self()))  writer_.Wait();
+  }
+
+ private:
+
+  pthread_t tid_;
+  TestLogSinkWriter writer_;
+};
+
+// Check that LogSink::WaitTillSent can be used in the advertised way.
+// We also do golden-stderr comparison.
+static void TestLogSinkWaitTillSent() {
+  { TestWaitingLogSink sink;
+    // Sleeps give the sink threads time to do all their work,
+    // so that we get a reliable log capture to compare to the golden file.
+    LOG(INFO) << "Message 1";
+    SleepForMilliseconds(60);
+    LOG(ERROR) << "Message 2";
+    SleepForMilliseconds(60);
+    LOG(WARNING) << "Message 3";
+    SleepForMilliseconds(60);
+  }
+  for (size_t i = 0; i < global_messages.size(); ++i) {
+    LOG(INFO) << "Sink capture: " << global_messages[i];
+  }
+  CHECK_EQ(global_messages.size(), 3UL);
+}
+
+TEST(Strerror, logging) {
+  int errcode = EINTR;
+  char *msg = strdup(strerror(errcode));
+  const size_t buf_size = strlen(msg) + 1;
+  char *buf = new char[buf_size];
+  CHECK_EQ(posix_strerror_r(errcode, NULL, 0), -1);
+  buf[0] = 'A';
+  CHECK_EQ(posix_strerror_r(errcode, buf, 0), -1);
+  CHECK_EQ(buf[0], 'A');
+  CHECK_EQ(posix_strerror_r(errcode, NULL, buf_size), -1);
+#if defined(OS_MACOSX) || defined(OS_FREEBSD) || defined(OS_OPENBSD)
+  // MacOSX or FreeBSD considers this case is an error since there is
+  // no enough space.
+  CHECK_EQ(posix_strerror_r(errcode, buf, 1), -1);
+#else
+  CHECK_EQ(posix_strerror_r(errcode, buf, 1), 0);
+#endif
+  CHECK_STREQ(buf, "");
+  CHECK_EQ(posix_strerror_r(errcode, buf, buf_size), 0);
+  CHECK_STREQ(buf, msg);
+  delete[] buf;
+  CHECK_EQ(msg, StrError(errcode));
+  free(msg);
+}
+
+// Simple routines to look at the sizes of generated code for LOG(FATAL) and
+// CHECK(..) via objdump
+/*
+static void MyFatal() {
+  LOG(FATAL) << "Failed";
+}
+static void MyCheck(bool a, bool b) {
+  CHECK_EQ(a, b);
+}
+*/
+#ifdef HAVE_LIB_GMOCK
+
+TEST(DVLog, Basic) {
+  ScopedMockLog log;
+
+#if NDEBUG
+  // We are expecting that nothing is logged.
+  EXPECT_CALL(log, Log(_, _, _)).Times(0);
+#else
+  EXPECT_CALL(log, Log(INFO, __FILE__, "debug log"));
+#endif
+
+  FLAGS_v = 1;
+  DVLOG(1) << "debug log";
+}
+
+TEST(DVLog, V0) {
+  ScopedMockLog log;
+
+  // We are expecting that nothing is logged.
+  EXPECT_CALL(log, Log(_, _, _)).Times(0);
+
+  FLAGS_v = 0;
+  DVLOG(1) << "debug log";
+}
+
+TEST(LogAtLevel, Basic) {
+  ScopedMockLog log;
+
+  // The function version outputs "logging.h" as a file name.
+  EXPECT_CALL(log, Log(WARNING, StrNe(__FILE__), "function version"));
+  EXPECT_CALL(log, Log(INFO, __FILE__, "macro version"));
+
+  int severity = WARNING;
+  LogAtLevel(severity, "function version");
+
+  severity = INFO;
+  // We can use the macro version as a C++ stream.
+  LOG_AT_LEVEL(severity) << "macro" << ' ' << "version";
+}
+
+TEST(TestExitOnDFatal, ToBeOrNotToBe) {
+  // Check the default setting...
+  EXPECT_TRUE(base::internal::GetExitOnDFatal());
+
+  // Turn off...
+  base::internal::SetExitOnDFatal(false);
+  EXPECT_FALSE(base::internal::GetExitOnDFatal());
+
+  // We don't die.
+  {
+    ScopedMockLog log;
+    //EXPECT_CALL(log, Log(_, _, _)).Times(AnyNumber());
+    // LOG(DFATAL) has severity FATAL if debugging, but is
+    // downgraded to ERROR if not debugging.
+    const LogSeverity severity =
+#ifdef NDEBUG
+        ERROR;
+#else
+        FATAL;
+#endif
+    EXPECT_CALL(log, Log(severity, __FILE__, "This should not be fatal"));
+    LOG(DFATAL) << "This should not be fatal";
+  }
+
+  // Turn back on...
+  base::internal::SetExitOnDFatal(true);
+  EXPECT_TRUE(base::internal::GetExitOnDFatal());
+
+#ifdef GTEST_HAS_DEATH_TEST
+  // Death comes on little cats' feet.
+  EXPECT_DEBUG_DEATH({
+      LOG(DFATAL) << "This should be fatal in debug mode";
+    }, "This should be fatal in debug mode");
+#endif
+}
+
+#ifdef HAVE_STACKTRACE
+
+static void BacktraceAtHelper() {
+  LOG(INFO) << "Not me";
+
+// The vertical spacing of the next 3 lines is significant.
+  LOG(INFO) << "Backtrace me";
+}
+static int kBacktraceAtLine = __LINE__ - 2;  // The line of the LOG(INFO) above
+
+TEST(LogBacktraceAt, DoesNotBacktraceWhenDisabled) {
+  StrictMock<ScopedMockLog> log;
+
+  FLAGS_log_backtrace_at = "";
+
+  EXPECT_CALL(log, Log(_, _, "Backtrace me"));
+  EXPECT_CALL(log, Log(_, _, "Not me"));
+
+  BacktraceAtHelper();
+}
+
+TEST(LogBacktraceAt, DoesBacktraceAtRightLineWhenEnabled) {
+  StrictMock<ScopedMockLog> log;
+
+  char where[100];
+  snprintf(where, 100, "%s:%d", const_basename(__FILE__), kBacktraceAtLine);
+  FLAGS_log_backtrace_at = where;
+
+  // The LOG at the specified line should include a stacktrace which includes
+  // the name of the containing function, followed by the log message.
+  // We use HasSubstr()s instead of ContainsRegex() for environments
+  // which don't have regexp.
+  EXPECT_CALL(log, Log(_, _, AllOf(HasSubstr("stacktrace:"),
+                                   HasSubstr("BacktraceAtHelper"),
+                                   HasSubstr("main"),
+                                   HasSubstr("Backtrace me"))));
+  // Other LOGs should not include a backtrace.
+  EXPECT_CALL(log, Log(_, _, "Not me"));
+
+  BacktraceAtHelper();
+}
+
+#endif // HAVE_STACKTRACE
+
+#endif // HAVE_LIB_GMOCK
+
+struct UserDefinedClass {
+  bool operator==(const UserDefinedClass&) const { return true; }
+};
+
+inline ostream& operator<<(ostream& out, const UserDefinedClass&) {
+  out << "OK";
+  return out;
+}
+
+TEST(UserDefinedClass, logging) {
+  UserDefinedClass u;
+  vector<string> buf;
+  LOG_STRING(INFO, &buf) << u;
+  CHECK_EQ(1UL, buf.size());
+  CHECK(buf[0].find("OK") != string::npos);
+
+  // We must be able to compile this.
+  CHECK_EQ(u, u);
+}
diff --git a/src/logging_unittest.err b/src/logging_unittest.err
new file mode 100644
index 000000000000..def0e93f1e80
--- /dev/null
+++ b/src/logging_unittest.err
@@ -0,0 +1,307 @@
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: Test: v=0 stderrthreshold=2 logtostderr=0 alsologtostderr=0
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: vlog -1
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: vlog 0
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: log info
+WYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: log warning
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: log error
+WARNING: Logging before InitGoogleLogging() is written to STDERR
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] vlog -1
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] vlog 0
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log info
+WYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log warning
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log error
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] vlog_if -1
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] vlog_if 0
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if info
+WYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if warning
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if error
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] vlog_if 0 expr
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if info expr
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if error expr
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if info every 1 expr
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if error every 1 expr
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] vlog_if 0 every 1 expr
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: Test: v=0 stderrthreshold=0 logtostderr=0 alsologtostderr=0
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: vlog -1
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: vlog 0
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: log info
+WYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: log warning
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: log error
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] vlog -1
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] vlog 0
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log info
+WYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log warning
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log error
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] vlog_if -1
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] vlog_if 0
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if info
+WYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if warning
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if error
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] vlog_if 0 expr
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if info expr
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if error expr
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if info every 1 expr
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if error every 1 expr
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] vlog_if 0 every 1 expr
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] foo bar 10 3.4
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] Plog every 2, iteration 1: __SUCCESS__ [0]
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] Log every 3, iteration 1
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] Log every 4, iteration 1
+WYEARDATE TIME__ THREADID logging_unittest.cc:LINE] Log if every 5, iteration 1
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] Log if every 1, iteration 1
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] Log if less than 3 every 2, iteration 1
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] Log if every 1, iteration 2
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] Plog every 2, iteration 3: __ENOENT__ [2]
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] Log if every 1, iteration 3
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] Log if less than 3 every 2, iteration 3
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] Log every 3, iteration 4
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] Log if every 1, iteration 4
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] Plog every 2, iteration 5: __EINTR__ [4]
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] Log every 4, iteration 5
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] Log if every 1, iteration 5
+WYEARDATE TIME__ THREADID logging_unittest.cc:LINE] Log if every 5, iteration 6
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] Log if every 1, iteration 6
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] Plog every 2, iteration 7: __ENXIO__ [6]
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] Log every 3, iteration 7
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] Log if every 1, iteration 7
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] Log if every 1, iteration 8
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] Plog every 2, iteration 9: __ENOEXEC__ [8]
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] Log every 4, iteration 9
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] Log if every 1, iteration 9
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] Log every 3, iteration 10
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] Log if every 1, iteration 10
+WYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if this
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] array
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] const array
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] foo 1000 0000001000 3e8
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] inner
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] outer
+no prefix
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: foo bar 10 3.400000
+WYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: array
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: const array
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: ptr __PTRTEST__
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: ptr __NULLP__
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: foo 1000 0000001000 3e8
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: foo 1000
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: foo 1000
+WYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: RAW_LOG ERROR: The Message was too long!
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: RAW_LOG ERROR: The Message was too long!
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: log
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: vlog 0 on
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: log
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: vlog 1 on
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: vlog 2 on
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: Test: v=0 stderrthreshold=0 logtostderr=0 alsologtostderr=0
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: vlog -1
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: vlog 0
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: log info
+WYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: log warning
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: log error
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] vlog -1
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] vlog 0
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log info
+WYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log warning
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log error
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] vlog_if -1
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] vlog_if 0
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if info
+WYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if warning
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if error
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] vlog_if 0 expr
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if info expr
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if error expr
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if info every 1 expr
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if error every 1 expr
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] vlog_if 0 every 1 expr
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: Test: v=1 stderrthreshold=0 logtostderr=0 alsologtostderr=0
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: vlog -1
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: vlog 0
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: vlog 1
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: log info
+WYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: log warning
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: log error
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] vlog -1
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] vlog 0
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] vlog 1
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log info
+WYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log warning
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log error
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] vlog_if -1
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] vlog_if 0
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] vlog_if 1
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if info
+WYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if warning
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if error
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] vlog_if 0 expr
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if info expr
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if error expr
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if info every 1 expr
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if error every 1 expr
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] vlog_if 0 every 1 expr
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: Test: v=-1 stderrthreshold=0 logtostderr=0 alsologtostderr=0
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: vlog -1
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: log info
+WYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: log warning
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: log error
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] vlog -1
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log info
+WYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log warning
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log error
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] vlog_if -1
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if info
+WYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if warning
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if error
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if info expr
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if error expr
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if info every 1 expr
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if error every 1 expr
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: Test: v=0 stderrthreshold=1 logtostderr=0 alsologtostderr=0
+WYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: log warning
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: log error
+WYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log warning
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log error
+WYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if warning
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if error
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if error expr
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if error every 1 expr
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: Test: v=0 stderrthreshold=2 logtostderr=0 alsologtostderr=0
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: log error
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log error
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if error
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if error expr
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if error every 1 expr
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: Test: v=0 stderrthreshold=3 logtostderr=0 alsologtostderr=0
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: Test: v=0 stderrthreshold=3 logtostderr=1 alsologtostderr=0
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: vlog -1
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: vlog 0
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: log info
+WYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: log warning
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: log error
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] vlog -1
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] vlog 0
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log info
+WYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log warning
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log error
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] vlog_if -1
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] vlog_if 0
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if info
+WYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if warning
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if error
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] vlog_if 0 expr
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if info expr
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if error expr
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if info every 1 expr
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if error every 1 expr
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] vlog_if 0 every 1 expr
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: Test: v=0 stderrthreshold=3 logtostderr=0 alsologtostderr=1
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: vlog -1
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: vlog 0
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: log info
+WYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: log warning
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: log error
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] vlog -1
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] vlog 0
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log info
+WYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log warning
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log error
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] vlog_if -1
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] vlog_if 0
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if info
+WYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if warning
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if error
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] vlog_if 0 expr
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if info expr
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if error expr
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if info every 1 expr
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if error every 1 expr
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] vlog_if 0 every 1 expr
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: Test: v=1 stderrthreshold=1 logtostderr=0 alsologtostderr=0
+WYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: log warning
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: log error
+WYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log warning
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log error
+WYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if warning
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if error
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if error expr
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if error every 1 expr
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: Test: v=1 stderrthreshold=3 logtostderr=0 alsologtostderr=1
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: vlog -1
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: vlog 0
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: vlog 1
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: log info
+WYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: log warning
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: log error
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] vlog -1
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] vlog 0
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] vlog 1
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log info
+WYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log warning
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log error
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] vlog_if -1
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] vlog_if 0
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] vlog_if 1
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if info
+WYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if warning
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if error
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] vlog_if 0 expr
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if info expr
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if error expr
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if info every 1 expr
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] log_if error every 1 expr
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] vlog_if 0 every 1 expr
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] LOG_STRING: reported info
+WYEARDATE TIME__ THREADID logging_unittest.cc:LINE] LOG_STRING: reported warning
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] LOG_STRING: reported error
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] Captured by LOG_STRING:  LOG_STRING: collected info
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] Captured by LOG_STRING:  LOG_STRING: collected warning
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] Captured by LOG_STRING:  LOG_STRING: collected error
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] LOG_TO_SINK: collected info
+WYEARDATE TIME__ THREADID logging_unittest.cc:LINE] LOG_TO_SINK: collected warning
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] LOG_TO_SINK: collected error
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] LOG_TO_SINK: reported info
+WYEARDATE TIME__ THREADID logging_unittest.cc:LINE] LOG_TO_SINK: reported warning
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] LOG_TO_SINK: reported error
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] Captured by LOG_TO_SINK:
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] LOG_TO_SINK: collected info
+WYEARDATE TIME__ THREADID logging_unittest.cc:LINE] LOG_TO_SINK: collected warning
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] LOG_TO_SINK: collected error
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] LOG_TO_SINK_BUT_NOT_TO_LOGFILE: collected info
+WYEARDATE TIME__ THREADID logging_unittest.cc:LINE] LOG_TO_SINK_BUT_NOT_TO_LOGFILE: collected warning
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] LOG_TO_SINK_BUT_NOT_TO_LOGFILE: collected error
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] LOG_TO_STRING: collected info
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] Captured by LOG_TO_STRING:  LOG_TO_STRING: collected info
+WYEARDATE TIME__ THREADID logging_unittest.cc:LINE] LOG_TO_STRING: collected warning
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] Captured by LOG_TO_STRING:  LOG_TO_STRING: collected warning
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] LOG_TO_STRING: collected error
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] Captured by LOG_TO_STRING:  LOG_TO_STRING: collected error
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] LOG_TO_STRING: reported info
+WYEARDATE TIME__ THREADID logging_unittest.cc:LINE] LOG_TO_STRING: reported warning
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] LOG_TO_STRING: reported error
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] Message 1
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: Buffering
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: Buffered
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: Waiting
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: Sink got a messages
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: Waited
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] Sink is sending out a message: IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] Message 1
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] Have 0 left
+EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] Message 2
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: Buffering
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: Buffered
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: Waiting
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: Sink got a messages
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: Waited
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] Sink is sending out a message: EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] Message 2
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] Have 0 left
+WYEARDATE TIME__ THREADID logging_unittest.cc:LINE] Message 3
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: Buffering
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: Buffered
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: Waiting
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: Sink got a messages
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] RAW: Waited
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] Sink is sending out a message: WYEARDATE TIME__ THREADID logging_unittest.cc:LINE] Message 3
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] Have 0 left
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] Sink capture: IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] Message 1
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] Sink capture: EYEARDATE TIME__ THREADID logging_unittest.cc:LINE] Message 2
+IYEARDATE TIME__ THREADID logging_unittest.cc:LINE] Sink capture: WYEARDATE TIME__ THREADID logging_unittest.cc:LINE] Message 3
diff --git a/src/mock-log.h b/src/mock-log.h
new file mode 100644
index 000000000000..30a0f74efeab
--- /dev/null
+++ b/src/mock-log.h
@@ -0,0 +1,156 @@
+// Copyright (c) 2007, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Author: Zhanyong Wan
+//
+// Defines the ScopedMockLog class (using Google C++ Mocking
+// Framework), which is convenient for testing code that uses LOG().
+
+#ifndef GLOG_SRC_MOCK_LOG_H_
+#define GLOG_SRC_MOCK_LOG_H_
+
+// For GOOGLE_NAMESPACE. This must go first so we get _XOPEN_SOURCE.
+#include "utilities.h"
+
+#include <string>
+
+#include <gmock/gmock.h>
+
+#include "glog/logging.h"
+
+_START_GOOGLE_NAMESPACE_
+namespace glog_testing {
+
+// A ScopedMockLog object intercepts LOG() messages issued during its
+// lifespan.  Using this together with Google C++ Mocking Framework,
+// it's very easy to test how a piece of code calls LOG().  The
+// typical usage:
+//
+//   TEST(FooTest, LogsCorrectly) {
+//     ScopedMockLog log;
+//
+//     // We expect the WARNING "Something bad!" exactly twice.
+//     EXPECT_CALL(log, Log(WARNING, _, "Something bad!"))
+//         .Times(2);
+//
+//     // We allow foo.cc to call LOG(INFO) any number of times.
+//     EXPECT_CALL(log, Log(INFO, HasSubstr("/foo.cc"), _))
+//         .Times(AnyNumber());
+//
+//     Foo();  // Exercises the code under test.
+//   }
+class ScopedMockLog : public GOOGLE_NAMESPACE::LogSink {
+ public:
+  // When a ScopedMockLog object is constructed, it starts to
+  // intercept logs.
+  ScopedMockLog() { AddLogSink(this); }
+
+  // When the object is destructed, it stops intercepting logs.
+  virtual ~ScopedMockLog() { RemoveLogSink(this); }
+
+  // Implements the mock method:
+  //
+  //   void Log(LogSeverity severity, const string& file_path,
+  //            const string& message);
+  //
+  // The second argument to Send() is the full path of the source file
+  // in which the LOG() was issued.
+  //
+  // Note, that in a multi-threaded environment, all LOG() messages from a
+  // single thread will be handled in sequence, but that cannot be guaranteed
+  // for messages from different threads. In fact, if the same or multiple
+  // expectations are matched on two threads concurrently, their actions will
+  // be executed concurrently as well and may interleave.
+  MOCK_METHOD3(Log, void(GOOGLE_NAMESPACE::LogSeverity severity,
+                         const std::string& file_path,
+                         const std::string& message));
+
+ private:
+  // Implements the send() virtual function in class LogSink.
+  // Whenever a LOG() statement is executed, this function will be
+  // invoked with information presented in the LOG().
+  //
+  // The method argument list is long and carries much information a
+  // test usually doesn't care about, so we trim the list before
+  // forwarding the call to Log(), which is much easier to use in
+  // tests.
+  //
+  // We still cannot call Log() directly, as it may invoke other LOG()
+  // messages, either due to Invoke, or due to an error logged in
+  // Google C++ Mocking Framework code, which would trigger a deadlock
+  // since a lock is held during send().
+  //
+  // Hence, we save the message for WaitTillSent() which will be called after
+  // the lock on send() is released, and we'll call Log() inside
+  // WaitTillSent(). Since while a single send() call may be running at a
+  // time, multiple WaitTillSent() calls (along with the one send() call) may
+  // be running simultaneously, we ensure thread-safety of the exchange between
+  // send() and WaitTillSent(), and that for each message, LOG(), send(),
+  // WaitTillSent() and Log() are executed in the same thread.
+  virtual void send(GOOGLE_NAMESPACE::LogSeverity severity,
+                    const char* full_filename,
+                    const char* /*base_filename*/, int /*line*/,
+                    const tm* /*tm_time*/,
+                    const char* message, size_t message_len) {
+    // We are only interested in the log severity, full file name, and
+    // log message.
+    message_info_.severity = severity;
+    message_info_.file_path = full_filename;
+    message_info_.message = std::string(message, message_len);
+  }
+
+  // Implements the WaitTillSent() virtual function in class LogSink.
+  // It will be executed after send() and after the global logging lock is
+  // released, so calls within it (or rather within the Log() method called
+  // within) may also issue LOG() statements.
+  //
+  // LOG(), send(), WaitTillSent() and Log() will occur in the same thread for
+  // a given log message.
+  virtual void WaitTillSent() {
+    // First, and very importantly, we save a copy of the message being
+    // processed before calling Log(), since Log() may indirectly call send()
+    // and WaitTillSent() in the same thread again.
+    MessageInfo message_info = message_info_;
+    Log(message_info.severity, message_info.file_path, message_info.message);
+  }
+
+  // All relevant information about a logged message that needs to be passed
+  // from send() to WaitTillSent().
+  struct MessageInfo {
+    GOOGLE_NAMESPACE::LogSeverity severity;
+    std::string file_path;
+    std::string message;
+  };
+  MessageInfo message_info_;
+};
+
+}  // namespace glog_testing
+_END_GOOGLE_NAMESPACE_
+
+#endif  // GLOG_SRC_MOCK_LOG_H_
diff --git a/src/mock-log_test.cc b/src/mock-log_test.cc
new file mode 100644
index 000000000000..7d58a307c222
--- /dev/null
+++ b/src/mock-log_test.cc
@@ -0,0 +1,106 @@
+// Copyright (c) 2007, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Author: Zhanyong Wan
+
+// Tests the ScopedMockLog class.
+
+#include "mock-log.h"
+
+#include <string>
+
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+
+namespace {
+
+using GOOGLE_NAMESPACE::INFO;
+using GOOGLE_NAMESPACE::WARNING;
+using GOOGLE_NAMESPACE::ERROR;
+using GOOGLE_NAMESPACE::glog_testing::ScopedMockLog;
+using std::string;
+using testing::_;
+using testing::HasSubstr;
+using testing::InSequence;
+using testing::InvokeWithoutArgs;
+
+// Tests that ScopedMockLog intercepts LOG()s when it's alive.
+TEST(ScopedMockLogTest, InterceptsLog) {
+  ScopedMockLog log;
+
+  InSequence s;
+  EXPECT_CALL(log, Log(WARNING, HasSubstr("/mock-log_test.cc"), "Fishy."));
+  EXPECT_CALL(log, Log(INFO, _, "Working..."))
+      .Times(2);
+  EXPECT_CALL(log, Log(ERROR, _, "Bad!!"));
+
+  LOG(WARNING) << "Fishy.";
+  LOG(INFO) << "Working...";
+  LOG(INFO) << "Working...";
+  LOG(ERROR) << "Bad!!";
+}
+
+void LogBranch() {
+  LOG(INFO) << "Logging a branch...";
+}
+
+void LogTree() {
+  LOG(INFO) << "Logging the whole tree...";
+}
+
+void LogForest() {
+  LOG(INFO) << "Logging the entire forest.";
+  LOG(INFO) << "Logging the entire forest..";
+  LOG(INFO) << "Logging the entire forest...";
+}
+
+// The purpose of the following test is to verify that intercepting logging
+// continues to work properly if a LOG statement is executed within the scope
+// of a mocked call.
+TEST(ScopedMockLogTest, LogDuringIntercept) {
+  ScopedMockLog log;
+  InSequence s;
+  EXPECT_CALL(log, Log(INFO, __FILE__, "Logging a branch..."))
+      .WillOnce(InvokeWithoutArgs(LogTree));
+  EXPECT_CALL(log, Log(INFO, __FILE__, "Logging the whole tree..."))
+      .WillOnce(InvokeWithoutArgs(LogForest));
+  EXPECT_CALL(log, Log(INFO, __FILE__, "Logging the entire forest."));
+  EXPECT_CALL(log, Log(INFO, __FILE__, "Logging the entire forest.."));
+  EXPECT_CALL(log, Log(INFO, __FILE__, "Logging the entire forest..."));
+  LogBranch();
+}
+
+}  // namespace
+
+int main(int argc, char **argv) {
+  GOOGLE_NAMESPACE::InitGoogleLogging(argv[0]);
+  testing::InitGoogleMock(&argc, argv);
+
+  return RUN_ALL_TESTS();
+}
diff --git a/src/package_config_unittest/working_config/CMakeLists.txt b/src/package_config_unittest/working_config/CMakeLists.txt
new file mode 100644
index 000000000000..d701aa7b1b7a
--- /dev/null
+++ b/src/package_config_unittest/working_config/CMakeLists.txt
@@ -0,0 +1,8 @@
+cmake_minimum_required (VERSION 3.1)
+project (glog_package_config)
+
+find_package (glog REQUIRED NO_MODULE)
+
+add_executable (glog_package_config glog_package_config.cc)
+
+target_link_libraries (glog_package_config PRIVATE glog::glog)
diff --git a/src/package_config_unittest/working_config/glog_package_config.cc b/src/package_config_unittest/working_config/glog_package_config.cc
new file mode 100644
index 000000000000..b7b5cf6c6650
--- /dev/null
+++ b/src/package_config_unittest/working_config/glog_package_config.cc
@@ -0,0 +1,6 @@
+#include <glog/logging.h>
+
+int main(int /*argc*/, char** argv)
+{
+    google::InitGoogleLogging(argv[0]);
+}
diff --git a/src/raw_logging.cc b/src/raw_logging.cc
new file mode 100644
index 000000000000..ba65961e9053
--- /dev/null
+++ b/src/raw_logging.cc
@@ -0,0 +1,158 @@
+// Copyright (c) 2006, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Author: Maxim Lifantsev
+//
+// logging_unittest.cc covers the functionality herein
+
+#include "utilities.h"
+
+#include <stdarg.h>
+#include <stdio.h>
+#include <errno.h>
+#ifdef HAVE_UNISTD_H
+# include <unistd.h>               // for close() and write()
+#endif
+#include <fcntl.h>                 // for open()
+#include <time.h>
+#include "config.h"
+#include "glog/logging.h"          // To pick up flag settings etc.
+#include "glog/raw_logging.h"
+#include "base/commandlineflags.h"
+
+#ifdef HAVE_STACKTRACE
+# include "stacktrace.h"
+#endif
+
+#if defined(HAVE_SYSCALL_H)
+#include <syscall.h>                 // for syscall()
+#elif defined(HAVE_SYS_SYSCALL_H)
+#include <sys/syscall.h>                 // for syscall()
+#endif
+#ifdef HAVE_UNISTD_H
+# include <unistd.h>
+#endif
+
+#if defined(HAVE_SYSCALL_H) || defined(HAVE_SYS_SYSCALL_H)
+# define safe_write(fd, s, len)  syscall(SYS_write, fd, s, len)
+#else
+  // Not so safe, but what can you do?
+# define safe_write(fd, s, len)  write(fd, s, len)
+#endif
+
+_START_GOOGLE_NAMESPACE_
+
+// CAVEAT: vsnprintf called from *DoRawLog below has some (exotic) code paths
+// that invoke malloc() and getenv() that might acquire some locks.
+// If this becomes a problem we should reimplement a subset of vsnprintf
+// that does not need locks and malloc.
+
+// Helper for RawLog__ below.
+// *DoRawLog writes to *buf of *size and move them past the written portion.
+// It returns true iff there was no overflow or error.
+static bool DoRawLog(char** buf, int* size, const char* format, ...) {
+  va_list ap;
+  va_start(ap, format);
+  int n = vsnprintf(*buf, *size, format, ap);
+  va_end(ap);
+  if (n < 0 || n > *size) return false;
+  *size -= n;
+  *buf += n;
+  return true;
+}
+
+// Helper for RawLog__ below.
+inline static bool VADoRawLog(char** buf, int* size,
+                              const char* format, va_list ap) {
+  int n = vsnprintf(*buf, *size, format, ap);
+  if (n < 0 || n > *size) return false;
+  *size -= n;
+  *buf += n;
+  return true;
+}
+
+static const int kLogBufSize = 3000;
+static bool crashed = false;
+static CrashReason crash_reason;
+static char crash_buf[kLogBufSize + 1] = { 0 };  // Will end in '\0'
+
+void RawLog__(LogSeverity severity, const char* file, int line,
+              const char* format, ...) {
+  if (!(FLAGS_logtostderr || severity >= FLAGS_stderrthreshold ||
+        FLAGS_alsologtostderr || !IsGoogleLoggingInitialized())) {
+    return;  // this stderr log message is suppressed
+  }
+  // can't call localtime_r here: it can allocate
+  char buffer[kLogBufSize];
+  char* buf = buffer;
+  int size = sizeof(buffer);
+
+  // NOTE: this format should match the specification in base/logging.h
+  DoRawLog(&buf, &size, "%c00000000 00:00:00.000000 %5u %s:%d] RAW: ",
+           LogSeverityNames[severity][0],
+           static_cast<unsigned int>(GetTID()),
+           const_basename(const_cast<char *>(file)), line);
+
+  // Record the position and size of the buffer after the prefix
+  const char* msg_start = buf;
+  const int msg_size = size;
+
+  va_list ap;
+  va_start(ap, format);
+  bool no_chop = VADoRawLog(&buf, &size, format, ap);
+  va_end(ap);
+  if (no_chop) {
+    DoRawLog(&buf, &size, "\n");
+  } else {
+    DoRawLog(&buf, &size, "RAW_LOG ERROR: The Message was too long!\n");
+  }
+  // We make a raw syscall to write directly to the stderr file descriptor,
+  // avoiding FILE buffering (to avoid invoking malloc()), and bypassing
+  // libc (to side-step any libc interception).
+  // We write just once to avoid races with other invocations of RawLog__.
+  safe_write(STDERR_FILENO, buffer, strlen(buffer));
+  if (severity == GLOG_FATAL)  {
+    if (!sync_val_compare_and_swap(&crashed, false, true)) {
+      crash_reason.filename = file;
+      crash_reason.line_number = line;
+      memcpy(crash_buf, msg_start, msg_size);  // Don't include prefix
+      crash_reason.message = crash_buf;
+#ifdef HAVE_STACKTRACE
+      crash_reason.depth =
+          GetStackTrace(crash_reason.stack, ARRAYSIZE(crash_reason.stack), 1);
+#else
+      crash_reason.depth = 0;
+#endif
+      SetCrashReason(&crash_reason);
+    }
+    LogMessage::Fail();  // abort()
+  }
+}
+
+_END_GOOGLE_NAMESPACE_
diff --git a/src/signalhandler.cc b/src/signalhandler.cc
new file mode 100644
index 000000000000..955471899afe
--- /dev/null
+++ b/src/signalhandler.cc
@@ -0,0 +1,403 @@
+// Copyright (c) 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Author: Satoru Takabayashi
+//
+// Implementation of InstallFailureSignalHandler().
+
+#include "utilities.h"
+#include "stacktrace.h"
+#include "symbolize.h"
+#include "glog/logging.h"
+
+#include <signal.h>
+#include <time.h>
+#ifdef HAVE_UCONTEXT_H
+# include <ucontext.h>
+#endif
+#ifdef HAVE_SYS_UCONTEXT_H
+# include <sys/ucontext.h>
+#endif
+#include <algorithm>
+
+_START_GOOGLE_NAMESPACE_
+
+namespace {
+
+// We'll install the failure signal handler for these signals.  We could
+// use strsignal() to get signal names, but we don't use it to avoid
+// introducing yet another #ifdef complication.
+//
+// The list should be synced with the comment in signalhandler.h.
+const struct {
+  int number;
+  const char *name;
+} kFailureSignals[] = {
+  { SIGSEGV, "SIGSEGV" },
+  { SIGILL, "SIGILL" },
+  { SIGFPE, "SIGFPE" },
+  { SIGABRT, "SIGABRT" },
+#if !defined(OS_WINDOWS)
+  { SIGBUS, "SIGBUS" },
+#endif
+  { SIGTERM, "SIGTERM" },
+};
+
+static bool kFailureSignalHandlerInstalled = false;
+
+// Returns the program counter from signal context, NULL if unknown.
+void* GetPC(void* ucontext_in_void) {
+#if (defined(HAVE_UCONTEXT_H) || defined(HAVE_SYS_UCONTEXT_H)) && defined(PC_FROM_UCONTEXT)
+  if (ucontext_in_void != NULL) {
+    ucontext_t *context = reinterpret_cast<ucontext_t *>(ucontext_in_void);
+    return (void*)context->PC_FROM_UCONTEXT;
+  }
+#endif
+  return NULL;
+}
+
+// The class is used for formatting error messages.  We don't use printf()
+// as it's not async signal safe.
+class MinimalFormatter {
+ public:
+  MinimalFormatter(char *buffer, int size)
+      : buffer_(buffer),
+        cursor_(buffer),
+        end_(buffer + size) {
+  }
+
+  // Returns the number of bytes written in the buffer.
+  int num_bytes_written() const { return (int) (cursor_ - buffer_); }
+
+  // Appends string from "str" and updates the internal cursor.
+  void AppendString(const char* str) {
+    int i = 0;
+    while (str[i] != '\0' && cursor_ + i < end_) {
+      cursor_[i] = str[i];
+      ++i;
+    }
+    cursor_ += i;
+  }
+
+  // Formats "number" in "radix" and updates the internal cursor.
+  // Lowercase letters are used for 'a' - 'z'.
+  void AppendUint64(uint64 number, int radix) {
+    int i = 0;
+    while (cursor_ + i < end_) {
+      const int tmp = number % radix;
+      number /= radix;
+      cursor_[i] = (tmp < 10 ? '0' + tmp : 'a' + tmp - 10);
+      ++i;
+      if (number == 0) {
+        break;
+      }
+    }
+    // Reverse the bytes written.
+    std::reverse(cursor_, cursor_ + i);
+    cursor_ += i;
+  }
+
+  // Formats "number" as hexadecimal number, and updates the internal
+  // cursor.  Padding will be added in front if needed.
+  void AppendHexWithPadding(uint64 number, int width) {
+    char* start = cursor_;
+    AppendString("0x");
+    AppendUint64(number, 16);
+    // Move to right and add padding in front if needed.
+    if (cursor_ < start + width) {
+      const int64 delta = start + width - cursor_;
+      std::copy(start, cursor_, start + delta);
+      std::fill(start, start + delta, ' ');
+      cursor_ = start + width;
+    }
+  }
+
+ private:
+  char *buffer_;
+  char *cursor_;
+  const char * const end_;
+};
+
+// Writes the given data with the size to the standard error.
+void WriteToStderr(const char* data, int size) {
+  if (write(STDERR_FILENO, data, size) < 0) {
+    // Ignore errors.
+  }
+}
+
+// The writer function can be changed by InstallFailureWriter().
+void (*g_failure_writer)(const char* data, int size) = WriteToStderr;
+
+// Dumps time information.  We don't dump human-readable time information
+// as localtime() is not guaranteed to be async signal safe.
+void DumpTimeInfo() {
+  time_t time_in_sec = time(NULL);
+  char buf[256];  // Big enough for time info.
+  MinimalFormatter formatter(buf, sizeof(buf));
+  formatter.AppendString("*** Aborted at ");
+  formatter.AppendUint64(time_in_sec, 10);
+  formatter.AppendString(" (unix time)");
+  formatter.AppendString(" try \"date -d @");
+  formatter.AppendUint64(time_in_sec, 10);
+  formatter.AppendString("\" if you are using GNU date ***\n");
+  g_failure_writer(buf, formatter.num_bytes_written());
+}
+
+// TODO(hamaji): Use signal instead of sigaction?
+#ifdef HAVE_SIGACTION
+
+// Dumps information about the signal to STDERR.
+void DumpSignalInfo(int signal_number, siginfo_t *siginfo) {
+  // Get the signal name.
+  const char* signal_name = NULL;
+  for (size_t i = 0; i < ARRAYSIZE(kFailureSignals); ++i) {
+    if (signal_number == kFailureSignals[i].number) {
+      signal_name = kFailureSignals[i].name;
+    }
+  }
+
+  char buf[256];  // Big enough for signal info.
+  MinimalFormatter formatter(buf, sizeof(buf));
+
+  formatter.AppendString("*** ");
+  if (signal_name) {
+    formatter.AppendString(signal_name);
+  } else {
+    // Use the signal number if the name is unknown.  The signal name
+    // should be known, but just in case.
+    formatter.AppendString("Signal ");
+    formatter.AppendUint64(signal_number, 10);
+  }
+  formatter.AppendString(" (@0x");
+  formatter.AppendUint64(reinterpret_cast<uintptr_t>(siginfo->si_addr), 16);
+  formatter.AppendString(")");
+  formatter.AppendString(" received by PID ");
+  formatter.AppendUint64(getpid(), 10);
+  formatter.AppendString(" (TID 0x");
+  // We assume pthread_t is an integral number or a pointer, rather
+  // than a complex struct.  In some environments, pthread_self()
+  // returns an uint64 but in some other environments pthread_self()
+  // returns a pointer.  Hence we use C-style cast here, rather than
+  // reinterpret/static_cast, to support both types of environments.
+  formatter.AppendUint64((uintptr_t)pthread_self(), 16);
+  formatter.AppendString(") ");
+  // Only linux has the PID of the signal sender in si_pid.
+#ifdef OS_LINUX
+  formatter.AppendString("from PID ");
+  formatter.AppendUint64(siginfo->si_pid, 10);
+  formatter.AppendString("; ");
+#endif
+  formatter.AppendString("stack trace: ***\n");
+  g_failure_writer(buf, formatter.num_bytes_written());
+}
+
+#endif  // HAVE_SIGACTION
+
+// Dumps information about the stack frame to STDERR.
+void DumpStackFrameInfo(const char* prefix, void* pc) {
+  // Get the symbol name.
+  const char *symbol = "(unknown)";
+  char symbolized[1024];  // Big enough for a sane symbol.
+  // Symbolizes the previous address of pc because pc may be in the
+  // next function.
+  if (Symbolize(reinterpret_cast<char *>(pc) - 1,
+                symbolized, sizeof(symbolized))) {
+    symbol = symbolized;
+  }
+
+  char buf[1024];  // Big enough for stack frame info.
+  MinimalFormatter formatter(buf, sizeof(buf));
+
+  formatter.AppendString(prefix);
+  formatter.AppendString("@ ");
+  const int width = 2 * sizeof(void*) + 2;  // + 2  for "0x".
+  formatter.AppendHexWithPadding(reinterpret_cast<uintptr_t>(pc), width);
+  formatter.AppendString(" ");
+  formatter.AppendString(symbol);
+  formatter.AppendString("\n");
+  g_failure_writer(buf, formatter.num_bytes_written());
+}
+
+// Invoke the default signal handler.
+void InvokeDefaultSignalHandler(int signal_number) {
+#ifdef HAVE_SIGACTION
+  struct sigaction sig_action;
+  memset(&sig_action, 0, sizeof(sig_action));
+  sigemptyset(&sig_action.sa_mask);
+  sig_action.sa_handler = SIG_DFL;
+  sigaction(signal_number, &sig_action, NULL);
+  kill(getpid(), signal_number);
+#elif defined(OS_WINDOWS)
+  signal(signal_number, SIG_DFL);
+  raise(signal_number);
+#endif
+}
+
+// This variable is used for protecting FailureSignalHandler() from
+// dumping stuff while another thread is doing it.  Our policy is to let
+// the first thread dump stuff and let other threads wait.
+// See also comments in FailureSignalHandler().
+static pthread_t* g_entered_thread_id_pointer = NULL;
+
+// Dumps signal and stack frame information, and invokes the default
+// signal handler once our job is done.
+#if defined(OS_WINDOWS)
+void FailureSignalHandler(int signal_number)
+#else
+void FailureSignalHandler(int signal_number,
+                          siginfo_t *signal_info,
+                          void *ucontext)
+#endif
+{
+  // First check if we've already entered the function.  We use an atomic
+  // compare and swap operation for platforms that support it.  For other
+  // platforms, we use a naive method that could lead to a subtle race.
+
+  // We assume pthread_self() is async signal safe, though it's not
+  // officially guaranteed.
+  pthread_t my_thread_id = pthread_self();
+  // NOTE: We could simply use pthread_t rather than pthread_t* for this,
+  // if pthread_self() is guaranteed to return non-zero value for thread
+  // ids, but there is no such guarantee.  We need to distinguish if the
+  // old value (value returned from __sync_val_compare_and_swap) is
+  // different from the original value (in this case NULL).
+  pthread_t* old_thread_id_pointer =
+      glog_internal_namespace_::sync_val_compare_and_swap(
+          &g_entered_thread_id_pointer,
+          static_cast<pthread_t*>(NULL),
+          &my_thread_id);
+  if (old_thread_id_pointer != NULL) {
+    // We've already entered the signal handler.  What should we do?
+    if (pthread_equal(my_thread_id, *g_entered_thread_id_pointer)) {
+      // It looks the current thread is reentering the signal handler.
+      // Something must be going wrong (maybe we are reentering by another
+      // type of signal?).  Kill ourself by the default signal handler.
+      InvokeDefaultSignalHandler(signal_number);
+    }
+    // Another thread is dumping stuff.  Let's wait until that thread
+    // finishes the job and kills the process.
+    while (true) {
+      sleep(1);
+    }
+  }
+  // This is the first time we enter the signal handler.  We are going to
+  // do some interesting stuff from here.
+  // TODO(satorux): We might want to set timeout here using alarm(), but
+  // mixing alarm() and sleep() can be a bad idea.
+
+  // First dump time info.
+  DumpTimeInfo();
+
+#if !defined(OS_WINDOWS)
+  // Get the program counter from ucontext.
+  void *pc = GetPC(ucontext);
+  DumpStackFrameInfo("PC: ", pc);
+#endif
+
+#ifdef HAVE_STACKTRACE
+  // Get the stack traces.
+  void *stack[32];
+  // +1 to exclude this function.
+  const int depth = GetStackTrace(stack, ARRAYSIZE(stack), 1);
+# ifdef HAVE_SIGACTION
+  DumpSignalInfo(signal_number, signal_info);
+# endif
+  // Dump the stack traces.
+  for (int i = 0; i < depth; ++i) {
+    DumpStackFrameInfo("    ", stack[i]);
+  }
+#endif
+
+  // *** TRANSITION ***
+  //
+  // BEFORE this point, all code must be async-termination-safe!
+  // (See WARNING above.)
+  //
+  // AFTER this point, we do unsafe things, like using LOG()!
+  // The process could be terminated or hung at any time.  We try to
+  // do more useful things first and riskier things later.
+
+  // Flush the logs before we do anything in case 'anything'
+  // causes problems.
+  FlushLogFilesUnsafe(0);
+
+  // Kill ourself by the default signal handler.
+  InvokeDefaultSignalHandler(signal_number);
+}
+
+}  // namespace
+
+namespace glog_internal_namespace_ {
+
+bool IsFailureSignalHandlerInstalled() {
+#ifdef HAVE_SIGACTION
+  // TODO(andschwa): Return kFailureSignalHandlerInstalled?
+  struct sigaction sig_action;
+  memset(&sig_action, 0, sizeof(sig_action));
+  sigemptyset(&sig_action.sa_mask);
+  sigaction(SIGABRT, NULL, &sig_action);
+  if (sig_action.sa_sigaction == &FailureSignalHandler)
+    return true;
+#elif defined(OS_WINDOWS)
+  return kFailureSignalHandlerInstalled;
+#endif  // HAVE_SIGACTION
+  return false;
+}
+
+}  // namespace glog_internal_namespace_
+
+void InstallFailureSignalHandler() {
+#ifdef HAVE_SIGACTION
+  // Build the sigaction struct.
+  struct sigaction sig_action;
+  memset(&sig_action, 0, sizeof(sig_action));
+  sigemptyset(&sig_action.sa_mask);
+  sig_action.sa_flags |= SA_SIGINFO;
+  sig_action.sa_sigaction = &FailureSignalHandler;
+
+  for (size_t i = 0; i < ARRAYSIZE(kFailureSignals); ++i) {
+    CHECK_ERR(sigaction(kFailureSignals[i].number, &sig_action, NULL));
+  }
+  kFailureSignalHandlerInstalled = true;
+#elif defined(OS_WINDOWS)
+  for (size_t i = 0; i < ARRAYSIZE(kFailureSignals); ++i) {
+    CHECK_NE(signal(kFailureSignals[i].number, &FailureSignalHandler),
+             SIG_ERR);
+  }
+  kFailureSignalHandlerInstalled = true;
+#endif  // HAVE_SIGACTION
+}
+
+void InstallFailureWriter(void (*writer)(const char* data, int size)) {
+#if defined(HAVE_SIGACTION) || defined(OS_WINDOWS)
+  g_failure_writer = writer;
+#endif  // HAVE_SIGACTION
+}
+
+_END_GOOGLE_NAMESPACE_
diff --git a/src/signalhandler_unittest.cc b/src/signalhandler_unittest.cc
new file mode 100644
index 000000000000..36d957b9c353
--- /dev/null
+++ b/src/signalhandler_unittest.cc
@@ -0,0 +1,112 @@
+// Copyright (c) 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Author: Satoru Takabayashi
+//
+// This is a helper binary for testing signalhandler.cc.  The actual test
+// is done in signalhandler_unittest.sh.
+
+#include "utilities.h"
+
+#if defined(HAVE_PTHREAD)
+# include <pthread.h>
+#endif
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string>
+#include "glog/logging.h"
+
+#ifdef HAVE_LIB_GFLAGS
+#include <gflags/gflags.h>
+using namespace GFLAGS_NAMESPACE;
+#endif
+
+using namespace GOOGLE_NAMESPACE;
+
+static void* DieInThread(void*) {
+  // We assume pthread_t is an integral number or a pointer, rather
+  // than a complex struct.  In some environments, pthread_self()
+  // returns an uint64 but in some other environments pthread_self()
+  // returns a pointer.  Hence we use C-style cast here, rather than
+  // reinterpret/static_cast, to support both types of environments.
+  fprintf(stderr, "0x%lx is dying\n", (long)pthread_self());
+  // Use volatile to prevent from these to be optimized away.
+  volatile int a = 0;
+  volatile int b = 1 / a;
+  fprintf(stderr, "We should have died: b=%d\n", b);
+  return NULL;
+}
+
+static void WriteToStdout(const char* data, int size) {
+  if (write(STDOUT_FILENO, data, size) < 0) {
+    // Ignore errors.
+  }
+}
+
+int main(int argc, char **argv) {
+#if defined(HAVE_STACKTRACE) && defined(HAVE_SYMBOLIZE)
+  InitGoogleLogging(argv[0]);
+#ifdef HAVE_LIB_GFLAGS
+  ParseCommandLineFlags(&argc, &argv, true);
+#endif
+  InstallFailureSignalHandler();
+  const std::string command = argc > 1 ? argv[1] : "none";
+  if (command == "segv") {
+    // We'll check if this is outputted.
+    LOG(INFO) << "create the log file";
+    LOG(INFO) << "a message before segv";
+    // We assume 0xDEAD is not writable.
+    int *a = (int*)0xDEAD;
+    *a = 0;
+  } else if (command == "loop") {
+    fprintf(stderr, "looping\n");
+    while (true);
+  } else if (command == "die_in_thread") {
+#if defined(HAVE_PTHREAD)
+    pthread_t thread;
+    pthread_create(&thread, NULL, &DieInThread, NULL);
+    pthread_join(thread, NULL);
+#else
+    fprintf(stderr, "no pthread\n");
+    return 1;
+#endif
+  } else if (command == "dump_to_stdout") {
+    InstallFailureWriter(WriteToStdout);
+    abort();
+  } else if (command == "installed") {
+    fprintf(stderr, "signal handler installed: %s\n",
+        IsFailureSignalHandlerInstalled() ? "true" : "false");
+  } else {
+    // Tell the shell script
+    puts("OK");
+  }
+#endif
+  return 0;
+}
diff --git a/src/signalhandler_unittest.sh b/src/signalhandler_unittest.sh
new file mode 100755
index 000000000000..265cd458c01e
--- /dev/null
+++ b/src/signalhandler_unittest.sh
@@ -0,0 +1,131 @@
+#! /bin/sh
+#
+# Copyright (c) 2008, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#
+# Author: Satoru Takabayashi
+#
+# Unit tests for signalhandler.cc.
+
+die () {
+    echo $1
+    exit 1
+}
+
+BINDIR=".libs"
+LIBGLOG="$BINDIR/libglog.so"
+
+BINARY="$BINDIR/signalhandler_unittest"
+LOG_INFO="./signalhandler_unittest.INFO"
+
+# Remove temporary files.
+rm -f signalhandler.out*
+
+if test -e "$BINARY"; then
+  # We need shared object.
+  export LD_LIBRARY_PATH=$BINDIR
+  export DYLD_LIBRARY_PATH=$BINDIR
+else
+  # For windows
+  BINARY="./signalhandler_unittest.exe"
+  if ! test -e "$BINARY"; then
+    echo "We coundn't find demangle_unittest binary."
+    exit 1
+  fi
+fi
+
+if [ x`$BINARY` != 'xOK' ]; then
+  echo "PASS (No stacktrace support. We don't run this test.)"
+  exit 0
+fi
+
+# The PC cannot be obtained in signal handlers on PowerPC correctly.
+# We just skip the test for PowerPC.
+if [ x`uname -p` = x"powerpc" ]; then
+  echo "PASS (We don't test the signal handler on PowerPC.)"
+  exit 0
+fi
+
+# Test for a case the program kills itself by SIGSEGV.
+GOOGLE_LOG_DIR=. $BINARY segv 2> signalhandler.out1
+for pattern in SIGSEGV 0xdead main "Aborted at [0-9]"; do
+  if ! grep --quiet "$pattern" signalhandler.out1; then
+    die "'$pattern' should appear in the output"
+  fi
+done
+if ! grep --quiet "a message before segv" $LOG_INFO; then
+  die "'a message before segv' should appear in the INFO log"
+fi
+rm -f $LOG_INFO
+
+# Test for a case the program is killed by this shell script.
+# $! = the process id of the last command run in the background.
+# $$ = the process id of this shell.
+$BINARY loop 2> signalhandler.out2 &
+# Wait until "looping" is written in the file.  This indicates the program
+# is ready to accept signals.
+while true; do
+  if grep --quiet looping signalhandler.out2; then
+    break
+  fi
+done
+kill -TERM $!
+wait $!
+
+from_pid=''
+# Only linux has the process ID of the signal sender.
+if [ x`uname` = "xLinux" ]; then
+  from_pid="from PID $$"
+fi
+for pattern in SIGTERM "by PID $!" "$from_pid" main "Aborted at [0-9]"; do
+  if ! grep --quiet "$pattern" signalhandler.out2; then
+    die "'$pattern' should appear in the output"
+  fi
+done
+
+# Test for a case the program dies in a non-main thread.
+$BINARY die_in_thread 2> signalhandler.out3
+EXPECTED_TID="`sed 's/ .*//; q' signalhandler.out3`"
+
+for pattern in SIGFPE DieInThread "TID $EXPECTED_TID" "Aborted at [0-9]"; do
+  if ! grep --quiet "$pattern" signalhandler.out3; then
+    die "'$pattern' should appear in the output"
+  fi
+done
+
+# Test for a case the program installs a custom failure writer that writes
+# stuff to stdout instead of stderr.
+$BINARY dump_to_stdout 1> signalhandler.out4
+for pattern in SIGABRT main "Aborted at [0-9]"; do
+  if ! grep --quiet "$pattern" signalhandler.out4; then
+    die "'$pattern' should appear in the output"
+  fi
+done
+
+echo PASS
diff --git a/src/stacktrace.h b/src/stacktrace.h
new file mode 100644
index 000000000000..cb64b33a688e
--- /dev/null
+++ b/src/stacktrace.h
@@ -0,0 +1,61 @@
+// Copyright (c) 2000 - 2007, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Routines to extract the current stack trace.  These functions are
+// thread-safe.
+
+#ifndef BASE_STACKTRACE_H_
+#define BASE_STACKTRACE_H_
+
+#include "config.h"
+#include "glog/logging.h"
+
+_START_GOOGLE_NAMESPACE_
+
+// This is similar to the GetStackFrames routine, except that it returns
+// the stack trace only, and not the stack frame sizes as well.
+// Example:
+//      main() { foo(); }
+//      foo() { bar(); }
+//      bar() {
+//        void* result[10];
+//        int depth = GetStackFrames(result, 10, 1);
+//      }
+//
+// This produces:
+//      result[0]       foo
+//      result[1]       main
+//           ....       ...
+//
+// "result" must not be NULL.
+GOOGLE_GLOG_DLL_DECL int GetStackTrace(void** result, int max_depth, int skip_count);
+
+_END_GOOGLE_NAMESPACE_
+
+#endif  // BASE_STACKTRACE_H_
diff --git a/src/stacktrace_generic-inl.h b/src/stacktrace_generic-inl.h
new file mode 100644
index 000000000000..fad81d3e3f4f
--- /dev/null
+++ b/src/stacktrace_generic-inl.h
@@ -0,0 +1,59 @@
+// Copyright (c) 2000 - 2007, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Portable implementation - just use glibc
+//
+// Note:  The glibc implementation may cause a call to malloc.
+// This can cause a deadlock in HeapProfiler.
+#include <execinfo.h>
+#include <string.h>
+#include "stacktrace.h"
+
+_START_GOOGLE_NAMESPACE_
+
+// If you change this function, also change GetStackFrames below.
+int GetStackTrace(void** result, int max_depth, int skip_count) {
+  static const int kStackLength = 64;
+  void * stack[kStackLength];
+  int size;
+
+  size = backtrace(stack, kStackLength);
+  skip_count++;  // we want to skip the current frame as well
+  int result_count = size - skip_count;
+  if (result_count < 0)
+    result_count = 0;
+  if (result_count > max_depth)
+    result_count = max_depth;
+  for (int i = 0; i < result_count; i++)
+    result[i] = stack[i + skip_count];
+
+  return result_count;
+}
+
+_END_GOOGLE_NAMESPACE_
diff --git a/src/stacktrace_libunwind-inl.h b/src/stacktrace_libunwind-inl.h
new file mode 100644
index 000000000000..e29a50c004f2
--- /dev/null
+++ b/src/stacktrace_libunwind-inl.h
@@ -0,0 +1,90 @@
+// Copyright (c) 2005 - 2007, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Author: Arun Sharma
+//
+// Produce stack trace using libunwind
+
+#include "utilities.h"
+
+extern "C" {
+#define UNW_LOCAL_ONLY
+#include <libunwind.h>
+}
+#include "glog/raw_logging.h"
+#include "stacktrace.h"
+
+_START_GOOGLE_NAMESPACE_
+
+// Sometimes, we can try to get a stack trace from within a stack
+// trace, because libunwind can call mmap (maybe indirectly via an
+// internal mmap based memory allocator), and that mmap gets trapped
+// and causes a stack-trace request.  If were to try to honor that
+// recursive request, we'd end up with infinite recursion or deadlock.
+// Luckily, it's safe to ignore those subsequent traces.  In such
+// cases, we return 0 to indicate the situation.
+// We can use the GCC __thread syntax here since libunwind is not supported on
+// Windows.
+static __thread bool g_tl_entered; // Initialized to false.
+
+// If you change this function, also change GetStackFrames below.
+int GetStackTrace(void** result, int max_depth, int skip_count) {
+  void *ip;
+  int n = 0;
+  unw_cursor_t cursor;
+  unw_context_t uc;
+
+  if (g_tl_entered) {
+    return 0;
+  }
+  g_tl_entered = true;
+
+  unw_getcontext(&uc);
+  RAW_CHECK(unw_init_local(&cursor, &uc) >= 0, "unw_init_local failed");
+  skip_count++;         // Do not include the "GetStackTrace" frame
+
+  while (n < max_depth) {
+    int ret = unw_get_reg(&cursor, UNW_REG_IP, (unw_word_t *) &ip);
+    if (ret < 0)
+      break;
+    if (skip_count > 0) {
+      skip_count--;
+    } else {
+      result[n++] = ip;
+    }
+    ret = unw_step(&cursor);
+    if (ret <= 0)
+      break;
+  }
+
+  g_tl_entered = false;
+  return n;
+}
+
+_END_GOOGLE_NAMESPACE_
diff --git a/src/stacktrace_powerpc-inl.h b/src/stacktrace_powerpc-inl.h
new file mode 100644
index 000000000000..03b91089aada
--- /dev/null
+++ b/src/stacktrace_powerpc-inl.h
@@ -0,0 +1,130 @@
+// Copyright (c) 2007, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Author: Craig Silverstein
+//
+// Produce stack trace.  I'm guessing (hoping!) the code is much like
+// for x86.  For apple machines, at least, it seems to be; see
+//    http://developer.apple.com/documentation/mac/runtimehtml/RTArch-59.html
+//    http://www.linux-foundation.org/spec/ELF/ppc64/PPC-elf64abi-1.9.html#STACK
+// Linux has similar code: http://patchwork.ozlabs.org/linuxppc/patch?id=8882
+
+#include <stdio.h>
+#include <stdint.h>   // for uintptr_t
+#include "stacktrace.h"
+
+_START_GOOGLE_NAMESPACE_
+
+// Given a pointer to a stack frame, locate and return the calling
+// stackframe, or return NULL if no stackframe can be found. Perform sanity
+// checks (the strictness of which is controlled by the boolean parameter
+// "STRICT_UNWINDING") to reduce the chance that a bad pointer is returned.
+template<bool STRICT_UNWINDING>
+static void **NextStackFrame(void **old_sp) {
+  void **new_sp = (void **) *old_sp;
+
+  // Check that the transition from frame pointer old_sp to frame
+  // pointer new_sp isn't clearly bogus
+  if (STRICT_UNWINDING) {
+    // With the stack growing downwards, older stack frame must be
+    // at a greater address that the current one.
+    if (new_sp <= old_sp) return NULL;
+    // Assume stack frames larger than 100,000 bytes are bogus.
+    if ((uintptr_t)new_sp - (uintptr_t)old_sp > 100000) return NULL;
+  } else {
+    // In the non-strict mode, allow discontiguous stack frames.
+    // (alternate-signal-stacks for example).
+    if (new_sp == old_sp) return NULL;
+    // And allow frames upto about 1MB.
+    if ((new_sp > old_sp)
+        && ((uintptr_t)new_sp - (uintptr_t)old_sp > 1000000)) return NULL;
+  }
+  if ((uintptr_t)new_sp & (sizeof(void *) - 1)) return NULL;
+  return new_sp;
+}
+
+// This ensures that GetStackTrace stes up the Link Register properly.
+void StacktracePowerPCDummyFunction() __attribute__((noinline));
+void StacktracePowerPCDummyFunction() { __asm__ volatile(""); }
+
+// If you change this function, also change GetStackFrames below.
+int GetStackTrace(void** result, int max_depth, int skip_count) {
+  void **sp;
+  // Apple OS X uses an old version of gnu as -- both Darwin 7.9.0 (Panther)
+  // and Darwin 8.8.1 (Tiger) use as 1.38.  This means we have to use a
+  // different asm syntax.  I don't know quite the best way to discriminate
+  // systems using the old as from the new one; I've gone with __APPLE__.
+#ifdef __APPLE__
+  __asm__ volatile ("mr %0,r1" : "=r" (sp));
+#else
+  __asm__ volatile ("mr %0,1" : "=r" (sp));
+#endif
+
+  // On PowerPC, the "Link Register" or "Link Record" (LR), is a stack
+  // entry that holds the return address of the subroutine call (what
+  // instruction we run after our function finishes).  This is the
+  // same as the stack-pointer of our parent routine, which is what we
+  // want here.  While the compiler will always(?) set up LR for
+  // subroutine calls, it may not for leaf functions (such as this one).
+  // This routine forces the compiler (at least gcc) to push it anyway.
+  StacktracePowerPCDummyFunction();
+
+  // The LR save area is used by the callee, so the top entry is bogus.
+  skip_count++;
+
+  int n = 0;
+  while (sp && n < max_depth) {
+    if (skip_count > 0) {
+      skip_count--;
+    } else {
+      // PowerPC has 3 main ABIs, which say where in the stack the
+      // Link Register is.  For DARWIN and AIX (used by apple and
+      // linux ppc64), it's in sp[2].  For SYSV (used by linux ppc),
+      // it's in sp[1].
+#if defined(_CALL_AIX) || defined(_CALL_DARWIN)
+      result[n++] = *(sp+2);
+#elif defined(_CALL_SYSV)
+      result[n++] = *(sp+1);
+#elif defined(__APPLE__) || ((defined(__linux) || defined(__linux__)) && defined(__PPC64__))
+      // This check is in case the compiler doesn't define _CALL_AIX/etc.
+      result[n++] = *(sp+2);
+#elif defined(__linux)
+      // This check is in case the compiler doesn't define _CALL_SYSV.
+      result[n++] = *(sp+1);
+#else
+#error Need to specify the PPC ABI for your archiecture.
+#endif
+    }
+    // Use strict unwinding rules.
+    sp = NextStackFrame<true>(sp);
+  }
+  return n;
+}
+
+_END_GOOGLE_NAMESPACE_
diff --git a/src/stacktrace_unittest.cc b/src/stacktrace_unittest.cc
new file mode 100644
index 000000000000..77d34291b381
--- /dev/null
+++ b/src/stacktrace_unittest.cc
@@ -0,0 +1,217 @@
+// Copyright (c) 2004, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "utilities.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include "config.h"
+#include "base/commandlineflags.h"
+#include "glog/logging.h"
+#include "stacktrace.h"
+
+#ifdef HAVE_EXECINFO_H
+# include <execinfo.h>
+#endif
+
+using namespace GOOGLE_NAMESPACE;
+
+#ifdef HAVE_STACKTRACE
+
+// Obtain a backtrace, verify that the expected callers are present in the
+// backtrace, and maybe print the backtrace to stdout.
+
+// The sequence of functions whose return addresses we expect to see in the
+// backtrace.
+const int BACKTRACE_STEPS = 6;
+
+struct AddressRange {
+  const void *start, *end;
+};
+
+// Expected function [start,end] range.
+AddressRange expected_range[BACKTRACE_STEPS];
+
+#if __GNUC__
+// Using GCC extension: address of a label can be taken with '&&label'.
+// Start should be a label somewhere before recursive call, end somewhere
+// after it.
+#define INIT_ADDRESS_RANGE(fn, start_label, end_label, prange)           \
+  do {                                                                   \
+    (prange)->start = &&start_label;                                     \
+    (prange)->end = &&end_label;                                         \
+    CHECK_LT((prange)->start, (prange)->end);                            \
+  } while (0)
+// This macro expands into "unmovable" code (opaque to GCC), and that
+// prevents GCC from moving a_label up or down in the code.
+// Without it, there is no code following the 'end' label, and GCC
+// (4.3.1, 4.4.0) thinks it safe to assign &&end an address that is before
+// the recursive call.
+#define DECLARE_ADDRESS_LABEL(a_label)                                   \
+  a_label: do { __asm__ __volatile__(""); } while (0)
+// Gcc 4.4.0 may split function into multiple chunks, and the chunk
+// performing recursive call may end up later in the code then the return
+// instruction (this actually happens with FDO).
+// Adjust function range from __builtin_return_address.
+#define ADJUST_ADDRESS_RANGE_FROM_RA(prange)                             \
+  do {                                                                   \
+    void *ra = __builtin_return_address(0);                              \
+    CHECK_LT((prange)->start, ra);                                       \
+    if (ra > (prange)->end) {                                            \
+      printf("Adjusting range from %p..%p to %p..%p\n",                  \
+             (prange)->start, (prange)->end,                             \
+             (prange)->start, ra);                                       \
+      (prange)->end = ra;                                                \
+    }                                                                    \
+  } while (0)
+#else
+// Assume the Check* functions below are not longer than 256 bytes.
+#define INIT_ADDRESS_RANGE(fn, start_label, end_label, prange)           \
+  do {                                                                   \
+    (prange)->start = reinterpret_cast<const void *>(&fn);               \
+    (prange)->end = reinterpret_cast<const char *>(&fn) + 256;           \
+  } while (0)
+#define DECLARE_ADDRESS_LABEL(a_label) do { } while (0)
+#define ADJUST_ADDRESS_RANGE_FROM_RA(prange) do { } while (0)
+#endif  // __GNUC__
+
+//-----------------------------------------------------------------------//
+
+static void CheckRetAddrIsInFunction(void *ret_addr, const AddressRange &range)
+{
+  CHECK_GE(ret_addr, range.start);
+  CHECK_LE(ret_addr, range.end);
+}
+
+//-----------------------------------------------------------------------//
+
+void ATTRIBUTE_NOINLINE CheckStackTrace(int);
+static void ATTRIBUTE_NOINLINE CheckStackTraceLeaf(void) {
+  const int STACK_LEN = 10;
+  void *stack[STACK_LEN];
+  int size;
+
+  ADJUST_ADDRESS_RANGE_FROM_RA(&expected_range[1]);
+  INIT_ADDRESS_RANGE(CheckStackTraceLeaf, start, end, &expected_range[0]);
+  DECLARE_ADDRESS_LABEL(start);
+  size = GetStackTrace(stack, STACK_LEN, 0);
+  printf("Obtained %d stack frames.\n", size);
+  CHECK_GE(size, 1);
+  CHECK_LE(size, STACK_LEN);
+
+  if (1) {
+#ifdef HAVE_EXECINFO_H
+    char **strings = backtrace_symbols(stack, size);
+    printf("Obtained %d stack frames.\n", size);
+    for (int i = 0; i < size; i++)
+      printf("%s %p\n", strings[i], stack[i]);
+    printf("CheckStackTrace() addr: %p\n", &CheckStackTrace);
+    free(strings);
+#endif
+  }
+  for (int i = 0; i < BACKTRACE_STEPS; i++) {
+    printf("Backtrace %d: expected: %p..%p  actual: %p ... ",
+           i, expected_range[i].start, expected_range[i].end, stack[i]);
+    fflush(stdout);
+    CheckRetAddrIsInFunction(stack[i], expected_range[i]);
+    printf("OK\n");
+  }
+  DECLARE_ADDRESS_LABEL(end);
+}
+
+//-----------------------------------------------------------------------//
+
+/* Dummy functions to make the backtrace more interesting. */
+static void ATTRIBUTE_NOINLINE CheckStackTrace4(int i) {
+  ADJUST_ADDRESS_RANGE_FROM_RA(&expected_range[2]);
+  INIT_ADDRESS_RANGE(CheckStackTrace4, start, end, &expected_range[1]);
+  DECLARE_ADDRESS_LABEL(start);
+  for (int j = i; j >= 0; j--)
+    CheckStackTraceLeaf();
+  DECLARE_ADDRESS_LABEL(end);
+}
+static void ATTRIBUTE_NOINLINE CheckStackTrace3(int i) {
+  ADJUST_ADDRESS_RANGE_FROM_RA(&expected_range[3]);
+  INIT_ADDRESS_RANGE(CheckStackTrace3, start, end, &expected_range[2]);
+  DECLARE_ADDRESS_LABEL(start);
+  for (int j = i; j >= 0; j--)
+    CheckStackTrace4(j);
+  DECLARE_ADDRESS_LABEL(end);
+}
+static void ATTRIBUTE_NOINLINE CheckStackTrace2(int i) {
+  ADJUST_ADDRESS_RANGE_FROM_RA(&expected_range[4]);
+  INIT_ADDRESS_RANGE(CheckStackTrace2, start, end, &expected_range[3]);
+  DECLARE_ADDRESS_LABEL(start);
+  for (int j = i; j >= 0; j--)
+    CheckStackTrace3(j);
+  DECLARE_ADDRESS_LABEL(end);
+}
+static void ATTRIBUTE_NOINLINE CheckStackTrace1(int i) {
+  ADJUST_ADDRESS_RANGE_FROM_RA(&expected_range[5]);
+  INIT_ADDRESS_RANGE(CheckStackTrace1, start, end, &expected_range[4]);
+  DECLARE_ADDRESS_LABEL(start);
+  for (int j = i; j >= 0; j--)
+    CheckStackTrace2(j);
+  DECLARE_ADDRESS_LABEL(end);
+}
+#ifndef __GNUC__
+// On non-GNU environment, we use the address of `CheckStackTrace` to
+// guess the address range of this function. This guess is wrong for
+// non-static function on Windows. This is probably because
+// `&CheckStackTrace` returns the address of a trampoline like PLT,
+// not the actual address of `CheckStackTrace`.
+// See https://github.com/google/glog/issues/421 for the detail.
+static
+#endif
+void ATTRIBUTE_NOINLINE CheckStackTrace(int i) {
+  INIT_ADDRESS_RANGE(CheckStackTrace, start, end, &expected_range[5]);
+  DECLARE_ADDRESS_LABEL(start);
+  for (int j = i; j >= 0; j--)
+    CheckStackTrace1(j);
+  DECLARE_ADDRESS_LABEL(end);
+}
+
+//-----------------------------------------------------------------------//
+
+int main(int, char ** argv) {
+  FLAGS_logtostderr = true;
+  InitGoogleLogging(argv[0]);
+
+  CheckStackTrace(0);
+
+  printf("PASS\n");
+  return 0;
+}
+
+#else
+int main() {
+  printf("PASS (no stacktrace support)\n");
+  return 0;
+}
+#endif  // HAVE_STACKTRACE
diff --git a/src/stacktrace_windows-inl.h b/src/stacktrace_windows-inl.h
new file mode 100644
index 000000000000..f7553a6d9736
--- /dev/null
+++ b/src/stacktrace_windows-inl.h
@@ -0,0 +1,50 @@
+// Copyright (c) 2000 - 2007, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Author: Andrew Schwartzmeyer
+//
+// Windows implementation - just use CaptureStackBackTrace
+
+#include "config.h"
+#include "port.h"
+#include "stacktrace.h"
+#include <dbghelp.h>
+
+_START_GOOGLE_NAMESPACE_
+
+int GetStackTrace(void** result, int max_depth, int skip_count) {
+  if (max_depth > 64) {
+    max_depth = 64;
+  }
+  skip_count++;  // we want to skip the current frame as well
+  // This API is thread-safe (moreover it walks only the current thread).
+  return CaptureStackBackTrace(skip_count, max_depth, result, NULL);
+}
+
+_END_GOOGLE_NAMESPACE_
diff --git a/src/stacktrace_x86-inl.h b/src/stacktrace_x86-inl.h
new file mode 100644
index 000000000000..3b8d5a8282d5
--- /dev/null
+++ b/src/stacktrace_x86-inl.h
@@ -0,0 +1,146 @@
+// Copyright (c) 2000 - 2007, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Produce stack trace
+
+#include <stdint.h>   // for uintptr_t
+
+#include "utilities.h"   // for OS_* macros
+
+#if !defined(OS_WINDOWS)
+#include <unistd.h>
+#include <sys/mman.h>
+#endif
+
+#include <stdio.h>  // for NULL
+#include "stacktrace.h"
+
+_START_GOOGLE_NAMESPACE_
+
+// Given a pointer to a stack frame, locate and return the calling
+// stackframe, or return NULL if no stackframe can be found. Perform sanity
+// checks (the strictness of which is controlled by the boolean parameter
+// "STRICT_UNWINDING") to reduce the chance that a bad pointer is returned.
+template<bool STRICT_UNWINDING>
+static void **NextStackFrame(void **old_sp) {
+  void **new_sp = (void **) *old_sp;
+
+  // Check that the transition from frame pointer old_sp to frame
+  // pointer new_sp isn't clearly bogus
+  if (STRICT_UNWINDING) {
+    // With the stack growing downwards, older stack frame must be
+    // at a greater address that the current one.
+    if (new_sp <= old_sp) return NULL;
+    // Assume stack frames larger than 100,000 bytes are bogus.
+    if ((uintptr_t)new_sp - (uintptr_t)old_sp > 100000) return NULL;
+  } else {
+    // In the non-strict mode, allow discontiguous stack frames.
+    // (alternate-signal-stacks for example).
+    if (new_sp == old_sp) return NULL;
+    // And allow frames upto about 1MB.
+    if ((new_sp > old_sp)
+        && ((uintptr_t)new_sp - (uintptr_t)old_sp > 1000000)) return NULL;
+  }
+  if ((uintptr_t)new_sp & (sizeof(void *) - 1)) return NULL;
+#ifdef __i386__
+  // On 64-bit machines, the stack pointer can be very close to
+  // 0xffffffff, so we explicitly check for a pointer into the
+  // last two pages in the address space
+  if ((uintptr_t)new_sp >= 0xffffe000) return NULL;
+#endif
+#if !defined(OS_WINDOWS)
+  if (!STRICT_UNWINDING) {
+    // Lax sanity checks cause a crash in 32-bit tcmalloc/crash_reason_test
+    // on AMD-based machines with VDSO-enabled kernels.
+    // Make an extra sanity check to insure new_sp is readable.
+    // Note: NextStackFrame<false>() is only called while the program
+    //       is already on its last leg, so it's ok to be slow here.
+    static int page_size = getpagesize();
+    void *new_sp_aligned = (void *)((uintptr_t)new_sp & ~(page_size - 1));
+    if (msync(new_sp_aligned, page_size, MS_ASYNC) == -1)
+      return NULL;
+  }
+#endif
+  return new_sp;
+}
+
+// If you change this function, also change GetStackFrames below.
+int GetStackTrace(void** result, int max_depth, int skip_count) {
+  void **sp;
+
+#ifdef __GNUC__
+#if __GNUC__ * 100 + __GNUC_MINOR__ >= 402
+#define USE_BUILTIN_FRAME_ADDRESS
+#endif
+#endif
+
+#ifdef USE_BUILTIN_FRAME_ADDRESS
+  sp = reinterpret_cast<void**>(__builtin_frame_address(0));
+#elif defined(__i386__)
+  // Stack frame format:
+  //    sp[0]   pointer to previous frame
+  //    sp[1]   caller address
+  //    sp[2]   first argument
+  //    ...
+  sp = (void **)&result - 2;
+#elif defined(__x86_64__)
+  // __builtin_frame_address(0) can return the wrong address on gcc-4.1.0-k8
+  unsigned long rbp;
+  // Move the value of the register %rbp into the local variable rbp.
+  // We need 'volatile' to prevent this instruction from getting moved
+  // around during optimization to before function prologue is done.
+  // An alternative way to achieve this
+  // would be (before this __asm__ instruction) to call Noop() defined as
+  //   static void Noop() __attribute__ ((noinline));  // prevent inlining
+  //   static void Noop() { asm(""); }  // prevent optimizing-away
+  __asm__ volatile ("mov %%rbp, %0" : "=r" (rbp));
+  // Arguments are passed in registers on x86-64, so we can't just
+  // offset from &result
+  sp = (void **) rbp;
+#endif
+
+  int n = 0;
+  while (sp && n < max_depth) {
+    if (*(sp+1) == (void *)0) {
+      // In 64-bit code, we often see a frame that
+      // points to itself and has a return address of 0.
+      break;
+    }
+    if (skip_count > 0) {
+      skip_count--;
+    } else {
+      result[n++] = *(sp+1);
+    }
+    // Use strict unwinding rules.
+    sp = NextStackFrame<true>(sp);
+  }
+  return n;
+}
+
+_END_GOOGLE_NAMESPACE_
diff --git a/src/stacktrace_x86_64-inl.h b/src/stacktrace_x86_64-inl.h
new file mode 100644
index 000000000000..f7d1dca85bc1
--- /dev/null
+++ b/src/stacktrace_x86_64-inl.h
@@ -0,0 +1,105 @@
+// Copyright (c) 2005 - 2007, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Author: Arun Sharma
+//
+// Produce stack trace using libgcc
+
+extern "C" {
+#include <stdlib.h> // for NULL
+#include <unwind.h> // ABI defined unwinder
+}
+#include "stacktrace.h"
+
+_START_GOOGLE_NAMESPACE_
+
+typedef struct {
+  void **result;
+  int max_depth;
+  int skip_count;
+  int count;
+} trace_arg_t;
+
+
+// Workaround for the malloc() in _Unwind_Backtrace() issue.
+static _Unwind_Reason_Code nop_backtrace(struct _Unwind_Context *uc, void *opq) {
+  return _URC_NO_REASON;
+}
+
+
+// This code is not considered ready to run until
+// static initializers run so that we are guaranteed
+// that any malloc-related initialization is done.
+static bool ready_to_run = false;
+class StackTraceInit {
+ public:
+   StackTraceInit() {
+     // Extra call to force initialization
+     _Unwind_Backtrace(nop_backtrace, NULL);
+     ready_to_run = true;
+   }
+};
+
+static StackTraceInit module_initializer;  // Force initialization
+
+static _Unwind_Reason_Code GetOneFrame(struct _Unwind_Context *uc, void *opq) {
+  trace_arg_t *targ = (trace_arg_t *) opq;
+
+  if (targ->skip_count > 0) {
+    targ->skip_count--;
+  } else {
+    targ->result[targ->count++] = (void *) _Unwind_GetIP(uc);
+  }
+
+  if (targ->count == targ->max_depth)
+    return _URC_END_OF_STACK;
+
+  return _URC_NO_REASON;
+}
+
+// If you change this function, also change GetStackFrames below.
+int GetStackTrace(void** result, int max_depth, int skip_count) {
+  if (!ready_to_run)
+    return 0;
+
+  trace_arg_t targ;
+
+  skip_count += 1;         // Do not include the "GetStackTrace" frame
+
+  targ.result = result;
+  targ.max_depth = max_depth;
+  targ.skip_count = skip_count;
+  targ.count = 0;
+
+  _Unwind_Backtrace(GetOneFrame, &targ);
+
+  return targ.count;
+}
+
+_END_GOOGLE_NAMESPACE_
diff --git a/src/stl_logging_unittest.cc b/src/stl_logging_unittest.cc
new file mode 100644
index 000000000000..269094c07bfa
--- /dev/null
+++ b/src/stl_logging_unittest.cc
@@ -0,0 +1,197 @@
+// Copyright (c) 2003, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "config.h"
+
+#ifdef HAVE_USING_OPERATOR
+
+#include <functional>
+#include <iostream>
+#include <map>
+#include <ostream>
+#include <string>
+#include <vector>
+
+#ifdef __GNUC__
+// C++0x isn't enabled by default in GCC and libc++ does not have
+// non-standard ext/* and tr1/unordered_*.
+# if defined(_LIBCPP_VERSION)
+#  ifndef GLOG_STL_LOGGING_FOR_UNORDERED
+#  define GLOG_STL_LOGGING_FOR_UNORDERED
+#  endif
+# else
+#  ifndef GLOG_STL_LOGGING_FOR_EXT_HASH
+#  define GLOG_STL_LOGGING_FOR_EXT_HASH
+#  endif
+#  ifndef GLOG_STL_LOGGING_FOR_EXT_SLIST
+#  define GLOG_STL_LOGGING_FOR_EXT_SLIST
+#  endif
+#  ifndef GLOG_STL_LOGGING_FOR_TR1_UNORDERED
+#  define GLOG_STL_LOGGING_FOR_TR1_UNORDERED
+#  endif
+# endif
+#endif
+
+#include "glog/logging.h"
+#include "glog/stl_logging.h"
+#include "googletest.h"
+
+using namespace std;
+#ifdef GLOG_STL_LOGGING_FOR_EXT_HASH
+using namespace __gnu_cxx;
+#endif
+
+struct user_hash {
+  size_t operator()(int x) const { return x; }
+};
+
+static void TestSTLLogging() {
+  {
+    // Test a sequence.
+    vector<int> v;
+    v.push_back(10);
+    v.push_back(20);
+    v.push_back(30);
+    ostringstream ss;
+    ss << v;
+    EXPECT_EQ(ss.str(), "10 20 30");
+    vector<int> copied_v(v);
+    CHECK_EQ(v, copied_v);  // This must compile.
+  }
+
+  {
+    // Test a sorted pair associative container.
+    map< int, string > m;
+    m[20] = "twenty";
+    m[10] = "ten";
+    m[30] = "thirty";
+    ostringstream ss;
+    ss << m;
+    EXPECT_EQ(ss.str(), "(10, ten) (20, twenty) (30, thirty)");
+    map< int, string > copied_m(m);
+    CHECK_EQ(m, copied_m);  // This must compile.
+  }
+
+#ifdef GLOG_STL_LOGGING_FOR_EXT_HASH
+  {
+    // Test a hashed simple associative container.
+    hash_set<int> hs;
+    hs.insert(10);
+    hs.insert(20);
+    hs.insert(30);
+    ostringstream ss;
+    ss << hs;
+    EXPECT_EQ(ss.str(), "10 20 30");
+    hash_set<int> copied_hs(hs);
+    CHECK_EQ(hs, copied_hs);  // This must compile.
+  }
+#endif
+
+#ifdef GLOG_STL_LOGGING_FOR_EXT_HASH
+  {
+    // Test a hashed pair associative container.
+    hash_map<int, string> hm;
+    hm[10] = "ten";
+    hm[20] = "twenty";
+    hm[30] = "thirty";
+    ostringstream ss;
+    ss << hm;
+    EXPECT_EQ(ss.str(), "(10, ten) (20, twenty) (30, thirty)");
+    hash_map<int, string> copied_hm(hm);
+    CHECK_EQ(hm, copied_hm);  // this must compile
+  }
+#endif
+
+  {
+    // Test a long sequence.
+    vector<int> v;
+    string expected;
+    for (int i = 0; i < 100; i++) {
+      v.push_back(i);
+      if (i > 0) expected += ' ';
+      char buf[256];
+      sprintf(buf, "%d", i);
+      expected += buf;
+    }
+    v.push_back(100);
+    expected += " ...";
+    ostringstream ss;
+    ss << v;
+    CHECK_EQ(ss.str(), expected.c_str());
+  }
+
+  {
+    // Test a sorted pair associative container.
+    // Use a non-default comparison functor.
+    map< int, string, greater<int> > m;
+    m[20] = "twenty";
+    m[10] = "ten";
+    m[30] = "thirty";
+    ostringstream ss;
+    ss << m;
+    EXPECT_EQ(ss.str(), "(30, thirty) (20, twenty) (10, ten)");
+    map< int, string, greater<int> > copied_m(m);
+    CHECK_EQ(m, copied_m);  // This must compile.
+  }
+
+#ifdef GLOG_STL_LOGGING_FOR_EXT_HASH
+  {
+    // Test a hashed simple associative container.
+    // Use a user defined hash function.
+    hash_set<int, user_hash> hs;
+    hs.insert(10);
+    hs.insert(20);
+    hs.insert(30);
+    ostringstream ss;
+    ss << hs;
+    EXPECT_EQ(ss.str(), "10 20 30");
+    hash_set<int, user_hash> copied_hs(hs);
+    CHECK_EQ(hs, copied_hs);  // This must compile.
+  }
+#endif
+}
+
+int main(int, char**) {
+  TestSTLLogging();
+  std::cout << "PASS\n";
+  return 0;
+}
+
+#else
+
+#include <iostream>
+
+int main(int, char**) {
+  std::cout << "We don't support stl_logging for this compiler.\n"
+            << "(we need compiler support of 'using ::operator<<' "
+            << "for this feature.)\n";
+  return 0;
+}
+
+#endif  // HAVE_USING_OPERATOR
diff --git a/src/symbolize.cc b/src/symbolize.cc
new file mode 100644
index 000000000000..76a1b0febeec
--- /dev/null
+++ b/src/symbolize.cc
@@ -0,0 +1,966 @@
+// Copyright (c) 2006, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Author: Satoru Takabayashi
+// Stack-footprint reduction work done by Raksit Ashok
+//
+// Implementation note:
+//
+// We don't use heaps but only use stacks.  We want to reduce the
+// stack consumption so that the symbolizer can run on small stacks.
+//
+// Here are some numbers collected with GCC 4.1.0 on x86:
+// - sizeof(Elf32_Sym)  = 16
+// - sizeof(Elf32_Shdr) = 40
+// - sizeof(Elf64_Sym)  = 24
+// - sizeof(Elf64_Shdr) = 64
+//
+// This implementation is intended to be async-signal-safe but uses
+// some functions which are not guaranteed to be so, such as memchr()
+// and memmove().  We assume they are async-signal-safe.
+//
+// Additional header can be specified by the GLOG_BUILD_CONFIG_INCLUDE
+// macro to add platform specific defines (e.g. OS_OPENBSD).
+
+#ifdef GLOG_BUILD_CONFIG_INCLUDE
+#include GLOG_BUILD_CONFIG_INCLUDE
+#endif  // GLOG_BUILD_CONFIG_INCLUDE
+
+#include "utilities.h"
+
+#if defined(HAVE_SYMBOLIZE)
+
+#include <string.h>
+
+#include <algorithm>
+#include <limits>
+
+#include "symbolize.h"
+#include "demangle.h"
+
+_START_GOOGLE_NAMESPACE_
+
+// We don't use assert() since it's not guaranteed to be
+// async-signal-safe.  Instead we define a minimal assertion
+// macro. So far, we don't need pretty printing for __FILE__, etc.
+
+// A wrapper for abort() to make it callable in ? :.
+static int AssertFail() {
+  abort();
+  return 0;  // Should not reach.
+}
+
+#define SAFE_ASSERT(expr) ((expr) ? 0 : AssertFail())
+
+static SymbolizeCallback g_symbolize_callback = NULL;
+void InstallSymbolizeCallback(SymbolizeCallback callback) {
+  g_symbolize_callback = callback;
+}
+
+static SymbolizeOpenObjectFileCallback g_symbolize_open_object_file_callback =
+    NULL;
+void InstallSymbolizeOpenObjectFileCallback(
+    SymbolizeOpenObjectFileCallback callback) {
+  g_symbolize_open_object_file_callback = callback;
+}
+
+// This function wraps the Demangle function to provide an interface
+// where the input symbol is demangled in-place.
+// To keep stack consumption low, we would like this function to not
+// get inlined.
+static ATTRIBUTE_NOINLINE void DemangleInplace(char *out, int out_size) {
+  char demangled[256];  // Big enough for sane demangled symbols.
+  if (Demangle(out, demangled, sizeof(demangled))) {
+    // Demangling succeeded. Copy to out if the space allows.
+    size_t len = strlen(demangled);
+    if (len + 1 <= (size_t)out_size) {  // +1 for '\0'.
+      SAFE_ASSERT(len < sizeof(demangled));
+      memmove(out, demangled, len + 1);
+    }
+  }
+}
+
+_END_GOOGLE_NAMESPACE_
+
+#if defined(__ELF__)
+
+#if defined(HAVE_DLFCN_H)
+#include <dlfcn.h>
+#endif
+#if defined(OS_OPENBSD)
+#include <sys/exec_elf.h>
+#else
+#include <elf.h>
+#endif
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "symbolize.h"
+#include "config.h"
+#include "glog/raw_logging.h"
+
+// Re-runs fn until it doesn't cause EINTR.
+#define NO_INTR(fn)   do {} while ((fn) < 0 && errno == EINTR)
+
+_START_GOOGLE_NAMESPACE_
+
+// Read up to "count" bytes from "offset" in the file pointed by file
+// descriptor "fd" into the buffer starting at "buf" while handling short reads
+// and EINTR.  On success, return the number of bytes read.  Otherwise, return
+// -1.
+static ssize_t ReadFromOffset(const int fd, void *buf, const size_t count,
+                              const off_t offset) {
+  SAFE_ASSERT(fd >= 0);
+  SAFE_ASSERT(count <= std::numeric_limits<ssize_t>::max());
+  char *buf0 = reinterpret_cast<char *>(buf);
+  ssize_t num_bytes = 0;
+  while (num_bytes < count) {
+    ssize_t len;
+    NO_INTR(len = pread(fd, buf0 + num_bytes, count - num_bytes,
+                        offset + num_bytes));
+    if (len < 0) {  // There was an error other than EINTR.
+      return -1;
+    }
+    if (len == 0) {  // Reached EOF.
+      break;
+    }
+    num_bytes += len;
+  }
+  SAFE_ASSERT(num_bytes <= count);
+  return num_bytes;
+}
+
+// Try reading exactly "count" bytes from "offset" bytes in a file
+// pointed by "fd" into the buffer starting at "buf" while handling
+// short reads and EINTR.  On success, return true. Otherwise, return
+// false.
+static bool ReadFromOffsetExact(const int fd, void *buf,
+                                const size_t count, const off_t offset) {
+  ssize_t len = ReadFromOffset(fd, buf, count, offset);
+  return len == count;
+}
+
+// Returns elf_header.e_type if the file pointed by fd is an ELF binary.
+static int FileGetElfType(const int fd) {
+  ElfW(Ehdr) elf_header;
+  if (!ReadFromOffsetExact(fd, &elf_header, sizeof(elf_header), 0)) {
+    return -1;
+  }
+  if (memcmp(elf_header.e_ident, ELFMAG, SELFMAG) != 0) {
+    return -1;
+  }
+  return elf_header.e_type;
+}
+
+// Read the section headers in the given ELF binary, and if a section
+// of the specified type is found, set the output to this section header
+// and return true.  Otherwise, return false.
+// To keep stack consumption low, we would like this function to not get
+// inlined.
+static ATTRIBUTE_NOINLINE bool
+GetSectionHeaderByType(const int fd, ElfW(Half) sh_num, const off_t sh_offset,
+                       ElfW(Word) type, ElfW(Shdr) *out) {
+  // Read at most 16 section headers at a time to save read calls.
+  ElfW(Shdr) buf[16];
+  for (int i = 0; i < sh_num;) {
+    const ssize_t num_bytes_left = (sh_num - i) * sizeof(buf[0]);
+    const ssize_t num_bytes_to_read =
+        (sizeof(buf) > num_bytes_left) ? num_bytes_left : sizeof(buf);
+    const ssize_t len = ReadFromOffset(fd, buf, num_bytes_to_read,
+                                       sh_offset + i * sizeof(buf[0]));
+    if (len == -1) {
+      return false;
+    }
+    SAFE_ASSERT(len % sizeof(buf[0]) == 0);
+    const ssize_t num_headers_in_buf = len / sizeof(buf[0]);
+    SAFE_ASSERT(num_headers_in_buf <= sizeof(buf) / sizeof(buf[0]));
+    for (int j = 0; j < num_headers_in_buf; ++j) {
+      if (buf[j].sh_type == type) {
+        *out = buf[j];
+        return true;
+      }
+    }
+    i += num_headers_in_buf;
+  }
+  return false;
+}
+
+// There is no particular reason to limit section name to 63 characters,
+// but there has (as yet) been no need for anything longer either.
+const int kMaxSectionNameLen = 64;
+
+// name_len should include terminating '\0'.
+bool GetSectionHeaderByName(int fd, const char *name, size_t name_len,
+                            ElfW(Shdr) *out) {
+  ElfW(Ehdr) elf_header;
+  if (!ReadFromOffsetExact(fd, &elf_header, sizeof(elf_header), 0)) {
+    return false;
+  }
+
+  ElfW(Shdr) shstrtab;
+  off_t shstrtab_offset = (elf_header.e_shoff +
+                           elf_header.e_shentsize * elf_header.e_shstrndx);
+  if (!ReadFromOffsetExact(fd, &shstrtab, sizeof(shstrtab), shstrtab_offset)) {
+    return false;
+  }
+
+  for (int i = 0; i < elf_header.e_shnum; ++i) {
+    off_t section_header_offset = (elf_header.e_shoff +
+                                   elf_header.e_shentsize * i);
+    if (!ReadFromOffsetExact(fd, out, sizeof(*out), section_header_offset)) {
+      return false;
+    }
+    char header_name[kMaxSectionNameLen];
+    if (sizeof(header_name) < name_len) {
+      RAW_LOG(WARNING, "Section name '%s' is too long (%" PRIuS "); "
+              "section will not be found (even if present).", name, name_len);
+      // No point in even trying.
+      return false;
+    }
+    off_t name_offset = shstrtab.sh_offset + out->sh_name;
+    ssize_t n_read = ReadFromOffset(fd, &header_name, name_len, name_offset);
+    if (n_read == -1) {
+      return false;
+    } else if (n_read != name_len) {
+      // Short read -- name could be at end of file.
+      continue;
+    }
+    if (memcmp(header_name, name, name_len) == 0) {
+      return true;
+    }
+  }
+  return false;
+}
+
+// Read a symbol table and look for the symbol containing the
+// pc. Iterate over symbols in a symbol table and look for the symbol
+// containing "pc".  On success, return true and write the symbol name
+// to out.  Otherwise, return false.
+// To keep stack consumption low, we would like this function to not get
+// inlined.
+static ATTRIBUTE_NOINLINE bool
+FindSymbol(uint64_t pc, const int fd, char *out, int out_size,
+           uint64_t symbol_offset, const ElfW(Shdr) *strtab,
+           const ElfW(Shdr) *symtab) {
+  if (symtab == NULL) {
+    return false;
+  }
+  const int num_symbols = symtab->sh_size / symtab->sh_entsize;
+  for (int i = 0; i < num_symbols;) {
+    off_t offset = symtab->sh_offset + i * symtab->sh_entsize;
+
+    // If we are reading Elf64_Sym's, we want to limit this array to
+    // 32 elements (to keep stack consumption low), otherwise we can
+    // have a 64 element Elf32_Sym array.
+#if __WORDSIZE == 64
+#define NUM_SYMBOLS 32
+#else
+#define NUM_SYMBOLS 64
+#endif
+
+    // Read at most NUM_SYMBOLS symbols at once to save read() calls.
+    ElfW(Sym) buf[NUM_SYMBOLS];
+    int num_symbols_to_read = std::min(NUM_SYMBOLS, num_symbols - i);
+    const ssize_t len =
+        ReadFromOffset(fd, &buf, sizeof(buf[0]) * num_symbols_to_read, offset);
+    SAFE_ASSERT(len % sizeof(buf[0]) == 0);
+    const ssize_t num_symbols_in_buf = len / sizeof(buf[0]);
+    SAFE_ASSERT(num_symbols_in_buf <= num_symbols_to_read);
+    for (int j = 0; j < num_symbols_in_buf; ++j) {
+      const ElfW(Sym)& symbol = buf[j];
+      uint64_t start_address = symbol.st_value;
+      start_address += symbol_offset;
+      uint64_t end_address = start_address + symbol.st_size;
+      if (symbol.st_value != 0 &&  // Skip null value symbols.
+          symbol.st_shndx != 0 &&  // Skip undefined symbols.
+          start_address <= pc && pc < end_address) {
+        ssize_t len1 = ReadFromOffset(fd, out, out_size,
+                                      strtab->sh_offset + symbol.st_name);
+        if (len1 <= 0 || memchr(out, '\0', out_size) == NULL) {
+          memset(out, 0, out_size);
+          return false;
+        }
+        return true;  // Obtained the symbol name.
+      }
+    }
+    i += num_symbols_in_buf;
+  }
+  return false;
+}
+
+// Get the symbol name of "pc" from the file pointed by "fd".  Process
+// both regular and dynamic symbol tables if necessary.  On success,
+// write the symbol name to "out" and return true.  Otherwise, return
+// false.
+static bool GetSymbolFromObjectFile(const int fd,
+                                    uint64_t pc,
+                                    char* out,
+                                    int out_size,
+                                    uint64_t base_address) {
+  // Read the ELF header.
+  ElfW(Ehdr) elf_header;
+  if (!ReadFromOffsetExact(fd, &elf_header, sizeof(elf_header), 0)) {
+    return false;
+  }
+
+  ElfW(Shdr) symtab, strtab;
+
+  // Consult a regular symbol table first.
+  if (GetSectionHeaderByType(fd, elf_header.e_shnum, elf_header.e_shoff,
+                             SHT_SYMTAB, &symtab)) {
+    if (!ReadFromOffsetExact(fd, &strtab, sizeof(strtab), elf_header.e_shoff +
+                             symtab.sh_link * sizeof(symtab))) {
+      return false;
+    }
+    if (FindSymbol(pc, fd, out, out_size, base_address, &strtab, &symtab)) {
+      return true;  // Found the symbol in a regular symbol table.
+    }
+  }
+
+  // If the symbol is not found, then consult a dynamic symbol table.
+  if (GetSectionHeaderByType(fd, elf_header.e_shnum, elf_header.e_shoff,
+                             SHT_DYNSYM, &symtab)) {
+    if (!ReadFromOffsetExact(fd, &strtab, sizeof(strtab), elf_header.e_shoff +
+                             symtab.sh_link * sizeof(symtab))) {
+      return false;
+    }
+    if (FindSymbol(pc, fd, out, out_size, base_address, &strtab, &symtab)) {
+      return true;  // Found the symbol in a dynamic symbol table.
+    }
+  }
+
+  return false;
+}
+
+namespace {
+// Thin wrapper around a file descriptor so that the file descriptor
+// gets closed for sure.
+struct FileDescriptor {
+  const int fd_;
+  explicit FileDescriptor(int fd) : fd_(fd) {}
+  ~FileDescriptor() {
+    if (fd_ >= 0) {
+      close(fd_);
+    }
+  }
+  int get() { return fd_; }
+
+ private:
+  explicit FileDescriptor(const FileDescriptor&);
+  void operator=(const FileDescriptor&);
+};
+
+// Helper class for reading lines from file.
+//
+// Note: we don't use ProcMapsIterator since the object is big (it has
+// a 5k array member) and uses async-unsafe functions such as sscanf()
+// and snprintf().
+class LineReader {
+ public:
+  explicit LineReader(int fd, char *buf, int buf_len, off_t offset)
+      : fd_(fd),
+        buf_(buf),
+        buf_len_(buf_len),
+        offset_(offset),
+        bol_(buf),
+        eol_(buf),
+        eod_(buf) {}
+
+  // Read '\n'-terminated line from file.  On success, modify "bol"
+  // and "eol", then return true.  Otherwise, return false.
+  //
+  // Note: if the last line doesn't end with '\n', the line will be
+  // dropped.  It's an intentional behavior to make the code simple.
+  bool ReadLine(const char **bol, const char **eol) {
+    if (BufferIsEmpty()) {  // First time.
+      const ssize_t num_bytes = ReadFromOffset(fd_, buf_, buf_len_, offset_);
+      if (num_bytes <= 0) {  // EOF or error.
+        return false;
+      }
+      offset_ += num_bytes;
+      eod_ = buf_ + num_bytes;
+      bol_ = buf_;
+    } else {
+      bol_ = eol_ + 1;  // Advance to the next line in the buffer.
+      SAFE_ASSERT(bol_ <= eod_);  // "bol_" can point to "eod_".
+      if (!HasCompleteLine()) {
+        const int incomplete_line_length = eod_ - bol_;
+        // Move the trailing incomplete line to the beginning.
+        memmove(buf_, bol_, incomplete_line_length);
+        // Read text from file and append it.
+        char * const append_pos = buf_ + incomplete_line_length;
+        const int capacity_left = buf_len_ - incomplete_line_length;
+        const ssize_t num_bytes =
+            ReadFromOffset(fd_, append_pos, capacity_left, offset_);
+        if (num_bytes <= 0) {  // EOF or error.
+          return false;
+        }
+        offset_ += num_bytes;
+        eod_ = append_pos + num_bytes;
+        bol_ = buf_;
+      }
+    }
+    eol_ = FindLineFeed();
+    if (eol_ == NULL) {  // '\n' not found.  Malformed line.
+      return false;
+    }
+    *eol_ = '\0';  // Replace '\n' with '\0'.
+
+    *bol = bol_;
+    *eol = eol_;
+    return true;
+  }
+
+  // Beginning of line.
+  const char *bol() {
+    return bol_;
+  }
+
+  // End of line.
+  const char *eol() {
+    return eol_;
+  }
+
+ private:
+  explicit LineReader(const LineReader&);
+  void operator=(const LineReader&);
+
+  char *FindLineFeed() {
+    return reinterpret_cast<char *>(memchr(bol_, '\n', eod_ - bol_));
+  }
+
+  bool BufferIsEmpty() {
+    return buf_ == eod_;
+  }
+
+  bool HasCompleteLine() {
+    return !BufferIsEmpty() && FindLineFeed() != NULL;
+  }
+
+  const int fd_;
+  char * const buf_;
+  const int buf_len_;
+  off_t offset_;
+  char *bol_;
+  char *eol_;
+  const char *eod_;  // End of data in "buf_".
+};
+}  // namespace
+
+// Place the hex number read from "start" into "*hex".  The pointer to
+// the first non-hex character or "end" is returned.
+static char *GetHex(const char *start, const char *end, uint64_t *hex) {
+  *hex = 0;
+  const char *p;
+  for (p = start; p < end; ++p) {
+    int ch = *p;
+    if ((ch >= '0' && ch <= '9') ||
+        (ch >= 'A' && ch <= 'F') || (ch >= 'a' && ch <= 'f')) {
+      *hex = (*hex << 4) | (ch < 'A' ? ch - '0' : (ch & 0xF) + 9);
+    } else {  // Encountered the first non-hex character.
+      break;
+    }
+  }
+  SAFE_ASSERT(p <= end);
+  return const_cast<char *>(p);
+}
+
+// Searches for the object file (from /proc/self/maps) that contains
+// the specified pc.  If found, sets |start_address| to the start address
+// of where this object file is mapped in memory, sets the module base
+// address into |base_address|, copies the object file name into
+// |out_file_name|, and attempts to open the object file.  If the object
+// file is opened successfully, returns the file descriptor.  Otherwise,
+// returns -1.  |out_file_name_size| is the size of the file name buffer
+// (including the null-terminator).
+static ATTRIBUTE_NOINLINE int
+OpenObjectFileContainingPcAndGetStartAddress(uint64_t pc,
+                                             uint64_t &start_address,
+                                             uint64_t &base_address,
+                                             char *out_file_name,
+                                             int out_file_name_size) {
+  int object_fd;
+
+  int maps_fd;
+  NO_INTR(maps_fd = open("/proc/self/maps", O_RDONLY));
+  FileDescriptor wrapped_maps_fd(maps_fd);
+  if (wrapped_maps_fd.get() < 0) {
+    return -1;
+  }
+
+  int mem_fd;
+  NO_INTR(mem_fd = open("/proc/self/mem", O_RDONLY));
+  FileDescriptor wrapped_mem_fd(mem_fd);
+  if (wrapped_mem_fd.get() < 0) {
+    return -1;
+  }
+
+  // Iterate over maps and look for the map containing the pc.  Then
+  // look into the symbol tables inside.
+  char buf[1024];  // Big enough for line of sane /proc/self/maps
+  int num_maps = 0;
+  LineReader reader(wrapped_maps_fd.get(), buf, sizeof(buf), 0);
+  while (true) {
+    num_maps++;
+    const char *cursor;
+    const char *eol;
+    if (!reader.ReadLine(&cursor, &eol)) {  // EOF or malformed line.
+      return -1;
+    }
+
+    // Start parsing line in /proc/self/maps.  Here is an example:
+    //
+    // 08048000-0804c000 r-xp 00000000 08:01 2142121    /bin/cat
+    //
+    // We want start address (08048000), end address (0804c000), flags
+    // (r-xp) and file name (/bin/cat).
+
+    // Read start address.
+    cursor = GetHex(cursor, eol, &start_address);
+    if (cursor == eol || *cursor != '-') {
+      return -1;  // Malformed line.
+    }
+    ++cursor;  // Skip '-'.
+
+    // Read end address.
+    uint64_t end_address;
+    cursor = GetHex(cursor, eol, &end_address);
+    if (cursor == eol || *cursor != ' ') {
+      return -1;  // Malformed line.
+    }
+    ++cursor;  // Skip ' '.
+
+    // Read flags.  Skip flags until we encounter a space or eol.
+    const char * const flags_start = cursor;
+    while (cursor < eol && *cursor != ' ') {
+      ++cursor;
+    }
+    // We expect at least four letters for flags (ex. "r-xp").
+    if (cursor == eol || cursor < flags_start + 4) {
+      return -1;  // Malformed line.
+    }
+
+    // Determine the base address by reading ELF headers in process memory.
+    ElfW(Ehdr) ehdr;
+    // Skip non-readable maps.
+    if (flags_start[0] == 'r' &&
+        ReadFromOffsetExact(mem_fd, &ehdr, sizeof(ElfW(Ehdr)), start_address) &&
+        memcmp(ehdr.e_ident, ELFMAG, SELFMAG) == 0) {
+      switch (ehdr.e_type) {
+        case ET_EXEC:
+          base_address = 0;
+          break;
+        case ET_DYN:
+          // Find the segment containing file offset 0. This will correspond
+          // to the ELF header that we just read. Normally this will have
+          // virtual address 0, but this is not guaranteed. We must subtract
+          // the virtual address from the address where the ELF header was
+          // mapped to get the base address.
+          //
+          // If we fail to find a segment for file offset 0, use the address
+          // of the ELF header as the base address.
+          base_address = start_address;
+          for (unsigned i = 0; i != ehdr.e_phnum; ++i) {
+            ElfW(Phdr) phdr;
+            if (ReadFromOffsetExact(
+                    mem_fd, &phdr, sizeof(phdr),
+                    start_address + ehdr.e_phoff + i * sizeof(phdr)) &&
+                phdr.p_type == PT_LOAD && phdr.p_offset == 0) {
+              base_address = start_address - phdr.p_vaddr;
+              break;
+            }
+          }
+          break;
+        default:
+          // ET_REL or ET_CORE. These aren't directly executable, so they don't
+          // affect the base address.
+          break;
+      }
+    }
+
+    // Check start and end addresses.
+    if (!(start_address <= pc && pc < end_address)) {
+      continue;  // We skip this map.  PC isn't in this map.
+    }
+
+   // Check flags.  We are only interested in "r*x" maps.
+    if (flags_start[0] != 'r' || flags_start[2] != 'x') {
+      continue;  // We skip this map.
+    }
+    ++cursor;  // Skip ' '.
+
+    // Read file offset.
+    uint64_t file_offset;
+    cursor = GetHex(cursor, eol, &file_offset);
+    if (cursor == eol || *cursor != ' ') {
+      return -1;  // Malformed line.
+    }
+    ++cursor;  // Skip ' '.
+
+    // Skip to file name.  "cursor" now points to dev.  We need to
+    // skip at least two spaces for dev and inode.
+    int num_spaces = 0;
+    while (cursor < eol) {
+      if (*cursor == ' ') {
+        ++num_spaces;
+      } else if (num_spaces >= 2) {
+        // The first non-space character after skipping two spaces
+        // is the beginning of the file name.
+        break;
+      }
+      ++cursor;
+    }
+    if (cursor == eol) {
+      return -1;  // Malformed line.
+    }
+
+    // Finally, "cursor" now points to file name of our interest.
+    NO_INTR(object_fd = open(cursor, O_RDONLY));
+    if (object_fd < 0) {
+      // Failed to open object file.  Copy the object file name to
+      // |out_file_name|.
+      strncpy(out_file_name, cursor, out_file_name_size);
+      // Making sure |out_file_name| is always null-terminated.
+      out_file_name[out_file_name_size - 1] = '\0';
+      return -1;
+    }
+    return object_fd;
+  }
+}
+
+// POSIX doesn't define any async-signal safe function for converting
+// an integer to ASCII. We'll have to define our own version.
+// itoa_r() converts a (signed) integer to ASCII. It returns "buf", if the
+// conversion was successful or NULL otherwise. It never writes more than "sz"
+// bytes. Output will be truncated as needed, and a NUL character is always
+// appended.
+// NOTE: code from sandbox/linux/seccomp-bpf/demo.cc.
+static char *itoa_r(intptr_t i, char *buf, size_t sz, int base, size_t padding) {
+  // Make sure we can write at least one NUL byte.
+  size_t n = 1;
+  if (n > sz)
+    return NULL;
+
+  if (base < 2 || base > 16) {
+    buf[0] = '\000';
+    return NULL;
+  }
+
+  char *start = buf;
+
+  uintptr_t j = i;
+
+  // Handle negative numbers (only for base 10).
+  if (i < 0 && base == 10) {
+    // This does "j = -i" while avoiding integer overflow.
+    j = static_cast<uintptr_t>(-(i + 1)) + 1;
+
+    // Make sure we can write the '-' character.
+    if (++n > sz) {
+      buf[0] = '\000';
+      return NULL;
+    }
+    *start++ = '-';
+  }
+
+  // Loop until we have converted the entire number. Output at least one
+  // character (i.e. '0').
+  char *ptr = start;
+  do {
+    // Make sure there is still enough space left in our output buffer.
+    if (++n > sz) {
+      buf[0] = '\000';
+      return NULL;
+    }
+
+    // Output the next digit.
+    *ptr++ = "0123456789abcdef"[j % base];
+    j /= base;
+
+    if (padding > 0)
+      padding--;
+  } while (j > 0 || padding > 0);
+
+  // Terminate the output with a NUL character.
+  *ptr = '\000';
+
+  // Conversion to ASCII actually resulted in the digits being in reverse
+  // order. We can't easily generate them in forward order, as we can't tell
+  // the number of characters needed until we are done converting.
+  // So, now, we reverse the string (except for the possible "-" sign).
+  while (--ptr > start) {
+    char ch = *ptr;
+    *ptr = *start;
+    *start++ = ch;
+  }
+  return buf;
+}
+
+// Safely appends string |source| to string |dest|.  Never writes past the
+// buffer size |dest_size| and guarantees that |dest| is null-terminated.
+static void SafeAppendString(const char* source, char* dest, int dest_size) {
+  int dest_string_length = strlen(dest);
+  SAFE_ASSERT(dest_string_length < dest_size);
+  dest += dest_string_length;
+  dest_size -= dest_string_length;
+  strncpy(dest, source, dest_size);
+  // Making sure |dest| is always null-terminated.
+  dest[dest_size - 1] = '\0';
+}
+
+// Converts a 64-bit value into a hex string, and safely appends it to |dest|.
+// Never writes past the buffer size |dest_size| and guarantees that |dest| is
+// null-terminated.
+static void SafeAppendHexNumber(uint64_t value, char* dest, int dest_size) {
+  // 64-bit numbers in hex can have up to 16 digits.
+  char buf[17] = {'\0'};
+  SafeAppendString(itoa_r(value, buf, sizeof(buf), 16, 0), dest, dest_size);
+}
+
+// The implementation of our symbolization routine.  If it
+// successfully finds the symbol containing "pc" and obtains the
+// symbol name, returns true and write the symbol name to "out".
+// Otherwise, returns false. If Callback function is installed via
+// InstallSymbolizeCallback(), the function is also called in this function,
+// and "out" is used as its output.
+// To keep stack consumption low, we would like this function to not
+// get inlined.
+static ATTRIBUTE_NOINLINE bool SymbolizeAndDemangle(void *pc, char *out,
+                                                    int out_size) {
+  uint64_t pc0 = reinterpret_cast<uintptr_t>(pc);
+  uint64_t start_address = 0;
+  uint64_t base_address = 0;
+  int object_fd = -1;
+
+  if (out_size < 1) {
+    return false;
+  }
+  out[0] = '\0';
+  SafeAppendString("(", out, out_size);
+
+  if (g_symbolize_open_object_file_callback) {
+    object_fd = g_symbolize_open_object_file_callback(pc0, start_address,
+                                                      base_address, out + 1,
+                                                      out_size - 1);
+  } else {
+    object_fd = OpenObjectFileContainingPcAndGetStartAddress(pc0, start_address,
+                                                             base_address,
+                                                             out + 1,
+                                                             out_size - 1);
+  }
+
+  FileDescriptor wrapped_object_fd(object_fd);
+
+#if defined(PRINT_UNSYMBOLIZED_STACK_TRACES)
+  {
+#else
+  // Check whether a file name was returned.
+  if (object_fd < 0) {
+#endif
+    if (out[1]) {
+      // The object file containing PC was determined successfully however the
+      // object file was not opened successfully.  This is still considered
+      // success because the object file name and offset are known and tools
+      // like asan_symbolize.py can be used for the symbolization.
+      out[out_size - 1] = '\0';  // Making sure |out| is always null-terminated.
+      SafeAppendString("+0x", out, out_size);
+      SafeAppendHexNumber(pc0 - base_address, out, out_size);
+      SafeAppendString(")", out, out_size);
+      return true;
+    }
+    // Failed to determine the object file containing PC.  Bail out.
+    return false;
+  }
+  int elf_type = FileGetElfType(wrapped_object_fd.get());
+  if (elf_type == -1) {
+    return false;
+  }
+  if (g_symbolize_callback) {
+    // Run the call back if it's installed.
+    // Note: relocation (and much of the rest of this code) will be
+    // wrong for prelinked shared libraries and PIE executables.
+    uint64_t relocation = (elf_type == ET_DYN) ? start_address : 0;
+    int num_bytes_written = g_symbolize_callback(wrapped_object_fd.get(),
+                                                 pc, out, out_size,
+                                                 relocation);
+    if (num_bytes_written > 0) {
+      out += num_bytes_written;
+      out_size -= num_bytes_written;
+    }
+  }
+  if (!GetSymbolFromObjectFile(wrapped_object_fd.get(), pc0,
+                               out, out_size, base_address)) {
+    if (out[1] && !g_symbolize_callback) {
+      // The object file containing PC was opened successfully however the
+      // symbol was not found. The object may have been stripped. This is still
+      // considered success because the object file name and offset are known
+      // and tools like asan_symbolize.py can be used for the symbolization.
+      out[out_size - 1] = '\0';  // Making sure |out| is always null-terminated.
+      SafeAppendString("+0x", out, out_size);
+      SafeAppendHexNumber(pc0 - base_address, out, out_size);
+      SafeAppendString(")", out, out_size);
+      return true;
+    }
+    return false;
+  }
+
+  // Symbolization succeeded.  Now we try to demangle the symbol.
+  DemangleInplace(out, out_size);
+  return true;
+}
+
+_END_GOOGLE_NAMESPACE_
+
+#elif defined(OS_MACOSX) && defined(HAVE_DLADDR)
+
+#include <dlfcn.h>
+#include <string.h>
+
+_START_GOOGLE_NAMESPACE_
+
+static ATTRIBUTE_NOINLINE bool SymbolizeAndDemangle(void *pc, char *out,
+                                                    int out_size) {
+  Dl_info info;
+  if (dladdr(pc, &info)) {
+    if ((int)strlen(info.dli_sname) < out_size) {
+      strcpy(out, info.dli_sname);
+      // Symbolization succeeded.  Now we try to demangle the symbol.
+      DemangleInplace(out, out_size);
+      return true;
+    }
+  }
+  return false;
+}
+
+_END_GOOGLE_NAMESPACE_
+
+#elif defined(OS_WINDOWS) || defined(OS_CYGWIN)
+
+#include <windows.h>
+#include <dbghelp.h>
+
+#ifdef _MSC_VER
+#pragma comment(lib, "dbghelp")
+#endif
+
+_START_GOOGLE_NAMESPACE_
+
+class SymInitializer {
+public:
+  HANDLE process;
+  bool ready;
+  SymInitializer() : process(NULL), ready(false) {
+    // Initialize the symbol handler.
+    // https://msdn.microsoft.com/en-us/library/windows/desktop/ms680344(v=vs.85).aspx
+    process = GetCurrentProcess();
+    // Defer symbol loading.
+    // We do not request undecorated symbols with SYMOPT_UNDNAME
+    // because the mangling library calls UnDecorateSymbolName.
+    SymSetOptions(SYMOPT_DEFERRED_LOADS);
+    if (SymInitialize(process, NULL, true)) {
+      ready = true;
+    }
+  }
+  ~SymInitializer() {
+    SymCleanup(process);
+    // We do not need to close `HANDLE process` because it's a "pseudo handle."
+  }
+private:
+  SymInitializer(const SymInitializer&);
+  SymInitializer& operator=(const SymInitializer&);
+};
+
+static ATTRIBUTE_NOINLINE bool SymbolizeAndDemangle(void *pc, char *out,
+                                                      int out_size) {
+  const static SymInitializer symInitializer;
+  if (!symInitializer.ready) {
+    return false;
+  }
+  // Resolve symbol information from address.
+  // https://msdn.microsoft.com/en-us/library/windows/desktop/ms680578(v=vs.85).aspx
+  char buf[sizeof(SYMBOL_INFO) + MAX_SYM_NAME];
+  SYMBOL_INFO *symbol = reinterpret_cast<SYMBOL_INFO *>(buf);
+  symbol->SizeOfStruct = sizeof(SYMBOL_INFO);
+  symbol->MaxNameLen = MAX_SYM_NAME;
+  // We use the ANSI version to ensure the string type is always `char *`.
+  // This could break if a symbol has Unicode in it.
+  BOOL ret = SymFromAddr(symInitializer.process,
+                         reinterpret_cast<DWORD64>(pc), 0, symbol);
+  if (ret == 1 && static_cast<int>(symbol->NameLen) < out_size) {
+    // `NameLen` does not include the null terminating character.
+    strncpy(out, symbol->Name, static_cast<size_t>(symbol->NameLen) + 1);
+    out[static_cast<size_t>(symbol->NameLen)] = '\0';
+    // Symbolization succeeded.  Now we try to demangle the symbol.
+    DemangleInplace(out, out_size);
+    return true;
+  }
+  return false;
+}
+
+_END_GOOGLE_NAMESPACE_
+
+#else
+# error BUG: HAVE_SYMBOLIZE was wrongly set
+#endif
+
+_START_GOOGLE_NAMESPACE_
+
+bool Symbolize(void *pc, char *out, int out_size) {
+  SAFE_ASSERT(out_size >= 0);
+  return SymbolizeAndDemangle(pc, out, out_size);
+}
+
+_END_GOOGLE_NAMESPACE_
+
+#else  /* HAVE_SYMBOLIZE */
+
+#include <assert.h>
+
+#include "config.h"
+
+_START_GOOGLE_NAMESPACE_
+
+// TODO: Support other environments.
+bool Symbolize(void *pc, char *out, int out_size) {
+  assert(0);
+  return false;
+}
+
+_END_GOOGLE_NAMESPACE_
+
+#endif
diff --git a/src/symbolize.h b/src/symbolize.h
new file mode 100644
index 000000000000..c6f9ec4360ed
--- /dev/null
+++ b/src/symbolize.h
@@ -0,0 +1,158 @@
+// Copyright (c) 2006, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Author: Satoru Takabayashi
+//
+// This library provides Symbolize() function that symbolizes program
+// counters to their corresponding symbol names on linux platforms.
+// This library has a minimal implementation of an ELF symbol table
+// reader (i.e. it doesn't depend on libelf, etc.).
+//
+// The algorithm used in Symbolize() is as follows.
+//
+//   1. Go through a list of maps in /proc/self/maps and find the map
+//   containing the program counter.
+//
+//   2. Open the mapped file and find a regular symbol table inside.
+//   Iterate over symbols in the symbol table and look for the symbol
+//   containing the program counter.  If such a symbol is found,
+//   obtain the symbol name, and demangle the symbol if possible.
+//   If the symbol isn't found in the regular symbol table (binary is
+//   stripped), try the same thing with a dynamic symbol table.
+//
+// Note that Symbolize() is originally implemented to be used in
+// FailureSignalHandler() in base/google.cc.  Hence it doesn't use
+// malloc() and other unsafe operations.  It should be both
+// thread-safe and async-signal-safe.
+
+#ifndef BASE_SYMBOLIZE_H_
+#define BASE_SYMBOLIZE_H_
+
+#include "utilities.h"
+#include "config.h"
+#include "glog/logging.h"
+
+#ifdef HAVE_SYMBOLIZE
+
+#if defined(__ELF__)  // defined by gcc
+#if defined(__OpenBSD__)
+#include <sys/exec_elf.h>
+#else
+#include <elf.h>
+#endif
+
+#if !defined(ANDROID)
+#include <link.h>  // For ElfW() macro.
+#endif
+
+// For systems where SIZEOF_VOID_P is not defined, determine it
+// based on __LP64__ (defined by gcc on 64-bit systems)
+#if !defined(SIZEOF_VOID_P)
+# if defined(__LP64__)
+#  define SIZEOF_VOID_P 8
+# else
+#  define SIZEOF_VOID_P 4
+# endif
+#endif
+
+// If there is no ElfW macro, let's define it by ourself.
+#ifndef ElfW
+# if SIZEOF_VOID_P == 4
+#  define ElfW(type) Elf32_##type
+# elif SIZEOF_VOID_P == 8
+#  define ElfW(type) Elf64_##type
+# else
+#  error "Unknown sizeof(void *)"
+# endif
+#endif
+
+_START_GOOGLE_NAMESPACE_
+
+// Gets the section header for the given name, if it exists. Returns true on
+// success. Otherwise, returns false.
+bool GetSectionHeaderByName(int fd, const char *name, size_t name_len,
+                            ElfW(Shdr) *out);
+
+_END_GOOGLE_NAMESPACE_
+
+#endif  /* __ELF__ */
+
+_START_GOOGLE_NAMESPACE_
+
+// Restrictions on the callbacks that follow:
+//  - The callbacks must not use heaps but only use stacks.
+//  - The callbacks must be async-signal-safe.
+
+// Installs a callback function, which will be called right before a symbol name
+// is printed. The callback is intended to be used for showing a file name and a
+// line number preceding a symbol name.
+// "fd" is a file descriptor of the object file containing the program
+// counter "pc". The callback function should write output to "out"
+// and return the size of the output written. On error, the callback
+// function should return -1.
+typedef int (*SymbolizeCallback)(int fd,
+                                 void* pc,
+                                 char* out,
+                                 size_t out_size,
+                                 uint64_t relocation);
+void InstallSymbolizeCallback(SymbolizeCallback callback);
+
+// Installs a callback function, which will be called instead of
+// OpenObjectFileContainingPcAndGetStartAddress.  The callback is expected
+// to searches for the object file (from /proc/self/maps) that contains
+// the specified pc.  If found, sets |start_address| to the start address
+// of where this object file is mapped in memory, sets the module base
+// address into |base_address|, copies the object file name into
+// |out_file_name|, and attempts to open the object file.  If the object
+// file is opened successfully, returns the file descriptor.  Otherwise,
+// returns -1.  |out_file_name_size| is the size of the file name buffer
+// (including the null-terminator).
+typedef int (*SymbolizeOpenObjectFileCallback)(uint64_t pc,
+                                               uint64_t& start_address,
+                                               uint64_t& base_address,
+                                               char* out_file_name,
+                                               int out_file_name_size);
+void InstallSymbolizeOpenObjectFileCallback(
+    SymbolizeOpenObjectFileCallback callback);
+
+_END_GOOGLE_NAMESPACE_
+
+#endif
+
+_START_GOOGLE_NAMESPACE_
+
+// Symbolizes a program counter.  On success, returns true and write the
+// symbol name to "out".  The symbol name is demangled if possible
+// (supports symbols generated by GCC 3.x or newer).  Otherwise,
+// returns false.
+GOOGLE_GLOG_DLL_DECL bool Symbolize(void *pc, char *out, int out_size);
+
+_END_GOOGLE_NAMESPACE_
+
+#endif  // BASE_SYMBOLIZE_H_
diff --git a/src/symbolize_unittest.cc b/src/symbolize_unittest.cc
new file mode 100644
index 000000000000..35cc2d31ff9b
--- /dev/null
+++ b/src/symbolize_unittest.cc
@@ -0,0 +1,425 @@
+// Copyright (c) 2006, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Author: Satoru Takabayashi
+//
+// Unit tests for functions in symbolize.cc.
+
+#include "utilities.h"
+
+#include <signal.h>
+#include <iostream>
+
+#include "glog/logging.h"
+#include "symbolize.h"
+#include "googletest.h"
+#include "config.h"
+
+#ifdef HAVE_LIB_GFLAGS
+#include <gflags/gflags.h>
+using namespace GFLAGS_NAMESPACE;
+#endif
+
+using namespace std;
+using namespace GOOGLE_NAMESPACE;
+
+#if defined(HAVE_STACKTRACE)
+
+#define always_inline
+
+// A wrapper function for Symbolize() to make the unit test simple.
+static const char *TrySymbolize(void *pc) {
+  static char symbol[4096];
+  if (Symbolize(pc, symbol, sizeof(symbol))) {
+    return symbol;
+  } else {
+    return NULL;
+  }
+}
+
+# if defined(__ELF__)
+
+// This unit tests make sense only with GCC.
+// Uses lots of GCC specific features.
+#if defined(__GNUC__) && !defined(__OPENCC__)
+#  if __GNUC__ >= 4
+#    define TEST_WITH_MODERN_GCC
+#    if __i386__  // always_inline isn't supported for x86_64 with GCC 4.1.0.
+#      undef always_inline
+#      define always_inline __attribute__((always_inline))
+#      define HAVE_ALWAYS_INLINE
+#    endif  // __i386__
+#  else
+#  endif  // __GNUC__ >= 4
+#  if defined(__i386__) || defined(__x86_64__)
+#    define TEST_X86_32_AND_64 1
+#  endif  // defined(__i386__) || defined(__x86_64__)
+#endif
+
+// Make them C linkage to avoid mangled names.
+extern "C" {
+void nonstatic_func();
+void nonstatic_func() {
+  volatile int a = 0;
+  ++a;
+}
+
+static void static_func() {
+  volatile int a = 0;
+  ++a;
+}
+}
+
+TEST(Symbolize, Symbolize) {
+  // We do C-style cast since GCC 2.95.3 doesn't allow
+  // reinterpret_cast<void *>(&func).
+
+  // Compilers should give us pointers to them.
+  EXPECT_STREQ("nonstatic_func", TrySymbolize((void *)(&nonstatic_func)));
+
+  // The name of an internal linkage symbol is not specified; allow either a
+  // mangled or an unmangled name here.
+  const char *static_func_symbol = TrySymbolize((void *)(&static_func));
+  CHECK(NULL != static_func_symbol);
+  EXPECT_TRUE(strcmp("static_func", static_func_symbol) == 0 ||
+              strcmp("static_func()", static_func_symbol) == 0);
+
+  EXPECT_TRUE(NULL == TrySymbolize(NULL));
+}
+
+struct Foo {
+  static void func(int x);
+};
+
+void ATTRIBUTE_NOINLINE Foo::func(int x) {
+  volatile int a = x;
+  ++a;
+}
+
+// With a modern GCC, Symbolize() should return demangled symbol
+// names.  Function parameters should be omitted.
+#ifdef TEST_WITH_MODERN_GCC
+TEST(Symbolize, SymbolizeWithDemangling) {
+  Foo::func(100);
+  EXPECT_STREQ("Foo::func()", TrySymbolize((void *)(&Foo::func)));
+}
+#endif
+
+// Tests that verify that Symbolize footprint is within some limit.
+
+// To measure the stack footprint of the Symbolize function, we create
+// a signal handler (for SIGUSR1 say) that calls the Symbolize function
+// on an alternate stack. This alternate stack is initialized to some
+// known pattern (0x55, 0x55, 0x55, ...). We then self-send this signal,
+// and after the signal handler returns, look at the alternate stack
+// buffer to see what portion has been touched.
+//
+// This trick gives us the the stack footprint of the signal handler.
+// But the signal handler, even before the call to Symbolize, consumes
+// some stack already. We however only want the stack usage of the
+// Symbolize function. To measure this accurately, we install two signal
+// handlers: one that does nothing and just returns, and another that
+// calls Symbolize. The difference between the stack consumption of these
+// two signals handlers should give us the Symbolize stack foorprint.
+
+static void *g_pc_to_symbolize;
+static char g_symbolize_buffer[4096];
+static char *g_symbolize_result;
+
+static void EmptySignalHandler(int signo) {}
+
+static void SymbolizeSignalHandler(int signo) {
+  if (Symbolize(g_pc_to_symbolize, g_symbolize_buffer,
+                sizeof(g_symbolize_buffer))) {
+    g_symbolize_result = g_symbolize_buffer;
+  } else {
+    g_symbolize_result = NULL;
+  }
+}
+
+const int kAlternateStackSize = 8096;
+const char kAlternateStackFillValue = 0x55;
+
+// These helper functions look at the alternate stack buffer, and figure
+// out what portion of this buffer has been touched - this is the stack
+// consumption of the signal handler running on this alternate stack.
+static ATTRIBUTE_NOINLINE bool StackGrowsDown(int *x) {
+  int y;
+  return &y < x;
+}
+static int GetStackConsumption(const char* alt_stack) {
+  int x;
+  if (StackGrowsDown(&x)) {
+    for (int i = 0; i < kAlternateStackSize; i++) {
+      if (alt_stack[i] != kAlternateStackFillValue) {
+        return (kAlternateStackSize - i);
+      }
+    }
+  } else {
+    for (int i = (kAlternateStackSize - 1); i >= 0; i--) {
+      if (alt_stack[i] != kAlternateStackFillValue) {
+        return i;
+      }
+    }
+  }
+  return -1;
+}
+
+#ifdef HAVE_SIGALTSTACK
+
+// Call Symbolize and figure out the stack footprint of this call.
+static const char *SymbolizeStackConsumption(void *pc, int *stack_consumed) {
+
+  g_pc_to_symbolize = pc;
+
+  // The alt-signal-stack cannot be heap allocated because there is a
+  // bug in glibc-2.2 where some signal handler setup code looks at the
+  // current stack pointer to figure out what thread is currently running.
+  // Therefore, the alternate stack must be allocated from the main stack
+  // itself.
+  char altstack[kAlternateStackSize];
+  memset(altstack, kAlternateStackFillValue, kAlternateStackSize);
+
+  // Set up the alt-signal-stack (and save the older one).
+  stack_t sigstk;
+  memset(&sigstk, 0, sizeof(stack_t));
+  stack_t old_sigstk;
+  sigstk.ss_sp = altstack;
+  sigstk.ss_size = kAlternateStackSize;
+  sigstk.ss_flags = 0;
+  CHECK_ERR(sigaltstack(&sigstk, &old_sigstk));
+
+  // Set up SIGUSR1 and SIGUSR2 signal handlers (and save the older ones).
+  struct sigaction sa;
+  memset(&sa, 0, sizeof(struct sigaction));
+  struct sigaction old_sa1, old_sa2;
+  sigemptyset(&sa.sa_mask);
+  sa.sa_flags = SA_ONSTACK;
+
+  // SIGUSR1 maps to EmptySignalHandler.
+  sa.sa_handler = EmptySignalHandler;
+  CHECK_ERR(sigaction(SIGUSR1, &sa, &old_sa1));
+
+  // SIGUSR2 maps to SymbolizeSignalHanlder.
+  sa.sa_handler = SymbolizeSignalHandler;
+  CHECK_ERR(sigaction(SIGUSR2, &sa, &old_sa2));
+
+  // Send SIGUSR1 signal and measure the stack consumption of the empty
+  // signal handler.
+  CHECK_ERR(kill(getpid(), SIGUSR1));
+  int stack_consumption1 = GetStackConsumption(altstack);
+
+  // Send SIGUSR2 signal and measure the stack consumption of the symbolize
+  // signal handler.
+  CHECK_ERR(kill(getpid(), SIGUSR2));
+  int stack_consumption2 = GetStackConsumption(altstack);
+
+  // The difference between the two stack consumption values is the
+  // stack footprint of the Symbolize function.
+  if (stack_consumption1 != -1 && stack_consumption2 != -1) {
+    *stack_consumed = stack_consumption2 - stack_consumption1;
+  } else {
+    *stack_consumed = -1;
+  }
+
+  // Log the stack consumption values.
+  LOG(INFO) << "Stack consumption of empty signal handler: "
+            << stack_consumption1;
+  LOG(INFO) << "Stack consumption of symbolize signal handler: "
+            << stack_consumption2;
+  LOG(INFO) << "Stack consumption of Symbolize: " << *stack_consumed;
+
+  // Now restore the old alt-signal-stack and signal handlers.
+  CHECK_ERR(sigaltstack(&old_sigstk, NULL));
+  CHECK_ERR(sigaction(SIGUSR1, &old_sa1, NULL));
+  CHECK_ERR(sigaction(SIGUSR2, &old_sa2, NULL));
+
+  return g_symbolize_result;
+}
+
+#ifdef __ppc64__
+// Symbolize stack consumption should be within 4kB.
+const int kStackConsumptionUpperLimit = 4096;
+#else
+// Symbolize stack consumption should be within 2kB.
+const int kStackConsumptionUpperLimit = 2048;
+#endif
+
+TEST(Symbolize, SymbolizeStackConsumption) {
+  int stack_consumed;
+  const char* symbol;
+
+  symbol = SymbolizeStackConsumption((void *)(&nonstatic_func),
+                                     &stack_consumed);
+  EXPECT_STREQ("nonstatic_func", symbol);
+  EXPECT_GT(stack_consumed, 0);
+  EXPECT_LT(stack_consumed, kStackConsumptionUpperLimit);
+
+  // The name of an internal linkage symbol is not specified; allow either a
+  // mangled or an unmangled name here.
+  symbol = SymbolizeStackConsumption((void *)(&static_func),
+                                     &stack_consumed);
+  CHECK(NULL != symbol);
+  EXPECT_TRUE(strcmp("static_func", symbol) == 0 ||
+              strcmp("static_func()", symbol) == 0);
+  EXPECT_GT(stack_consumed, 0);
+  EXPECT_LT(stack_consumed, kStackConsumptionUpperLimit);
+}
+
+#ifdef TEST_WITH_MODERN_GCC
+TEST(Symbolize, SymbolizeWithDemanglingStackConsumption) {
+  Foo::func(100);
+  int stack_consumed;
+  const char* symbol;
+
+  symbol = SymbolizeStackConsumption((void *)(&Foo::func), &stack_consumed);
+
+  EXPECT_STREQ("Foo::func()", symbol);
+  EXPECT_GT(stack_consumed, 0);
+  EXPECT_LT(stack_consumed, kStackConsumptionUpperLimit);
+}
+#endif
+
+#endif  // HAVE_SIGALTSTACK
+
+// x86 specific tests.  Uses some inline assembler.
+extern "C" {
+inline void* always_inline inline_func() {
+  void *pc = NULL;
+#ifdef TEST_X86_32_AND_64
+  __asm__ __volatile__("call 1f; 1: pop %0" : "=r"(pc));
+#endif
+  return pc;
+}
+
+void* ATTRIBUTE_NOINLINE non_inline_func();
+void* ATTRIBUTE_NOINLINE non_inline_func() {
+  void *pc = NULL;
+#ifdef TEST_X86_32_AND_64
+  __asm__ __volatile__("call 1f; 1: pop %0" : "=r"(pc));
+#endif
+  return pc;
+}
+
+static void ATTRIBUTE_NOINLINE TestWithPCInsideNonInlineFunction() {
+#if defined(TEST_X86_32_AND_64) && defined(HAVE_ATTRIBUTE_NOINLINE)
+  void *pc = non_inline_func();
+  const char *symbol = TrySymbolize(pc);
+  CHECK(symbol != NULL);
+  CHECK_STREQ(symbol, "non_inline_func");
+  cout << "Test case TestWithPCInsideNonInlineFunction passed." << endl;
+#endif
+}
+
+static void ATTRIBUTE_NOINLINE TestWithPCInsideInlineFunction() {
+#if defined(TEST_X86_32_AND_64) && defined(HAVE_ALWAYS_INLINE)
+  void *pc = inline_func();  // Must be inlined.
+  const char *symbol = TrySymbolize(pc);
+  CHECK(symbol != NULL);
+  CHECK_STREQ(symbol, __FUNCTION__);
+  cout << "Test case TestWithPCInsideInlineFunction passed." << endl;
+#endif
+}
+}
+
+// Test with a return address.
+static void ATTRIBUTE_NOINLINE TestWithReturnAddress() {
+#if defined(HAVE_ATTRIBUTE_NOINLINE)
+  void *return_address = __builtin_return_address(0);
+  const char *symbol = TrySymbolize(return_address);
+  CHECK(symbol != NULL);
+  CHECK_STREQ(symbol, "main");
+  cout << "Test case TestWithReturnAddress passed." << endl;
+#endif
+}
+
+# elif defined(OS_WINDOWS) || defined(OS_CYGWIN)
+
+#ifdef _MSC_VER
+#include <intrin.h>
+#pragma intrinsic(_ReturnAddress)
+#endif
+
+struct Foo {
+  static void func(int x);
+};
+
+__declspec(noinline) void Foo::func(int x) {
+  volatile int a = x;
+  ++a;
+}
+
+TEST(Symbolize, SymbolizeWithDemangling) {
+  Foo::func(100);
+  const char* ret = TrySymbolize((void *)(&Foo::func));
+  EXPECT_STREQ("public: static void __cdecl Foo::func(int)", ret);
+}
+
+__declspec(noinline) void TestWithReturnAddress() {
+  void *return_address =
+#ifdef __GNUC__ // Cygwin and MinGW support
+	  __builtin_return_address(0)
+#else
+	  _ReturnAddress()
+#endif
+	  ;
+  const char *symbol = TrySymbolize(return_address);
+  CHECK(symbol != NULL);
+  CHECK_STREQ(symbol, "main");
+  cout << "Test case TestWithReturnAddress passed." << endl;
+}
+# endif  // __ELF__
+#endif  // HAVE_STACKTRACE
+
+int main(int argc, char **argv) {
+  FLAGS_logtostderr = true;
+  InitGoogleLogging(argv[0]);
+  InitGoogleTest(&argc, argv);
+#if defined(HAVE_SYMBOLIZE) && defined(HAVE_STACKTRACE)
+# if defined(__ELF__)
+  // We don't want to get affected by the callback interface, that may be
+  // used to install some callback function at InitGoogle() time.
+  InstallSymbolizeCallback(NULL);
+
+  TestWithPCInsideInlineFunction();
+  TestWithPCInsideNonInlineFunction();
+  TestWithReturnAddress();
+  return RUN_ALL_TESTS();
+# elif defined(OS_WINDOWS) || defined(OS_CYGWIN)
+  TestWithReturnAddress();
+  return RUN_ALL_TESTS();
+# else  // OS_WINDOWS
+  printf("PASS (no symbolize_unittest support)\n");
+  return 0;
+# endif  // __ELF__
+#else
+  printf("PASS (no symbolize support)\n");
+  return 0;
+#endif  // HAVE_SYMBOLIZE
+}
diff --git a/src/utilities.cc b/src/utilities.cc
new file mode 100644
index 000000000000..9a1e35d0229d
--- /dev/null
+++ b/src/utilities.cc
@@ -0,0 +1,374 @@
+// Copyright (c) 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Author: Shinichiro Hamaji
+
+#include "utilities.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <signal.h>
+#ifdef HAVE_SYS_TIME_H
+# include <sys/time.h>
+#endif
+#include <time.h>
+#if defined(HAVE_SYSCALL_H)
+#include <syscall.h>                 // for syscall()
+#elif defined(HAVE_SYS_SYSCALL_H)
+#include <sys/syscall.h>                 // for syscall()
+#endif
+#ifdef HAVE_SYSLOG_H
+# include <syslog.h>
+#endif
+#ifdef HAVE_UNISTD_H
+# include <unistd.h>  // For geteuid.
+#endif
+#ifdef HAVE_PWD_H
+# include <pwd.h>
+#endif
+
+#include "base/googleinit.h"
+
+using std::string;
+
+_START_GOOGLE_NAMESPACE_
+
+static const char* g_program_invocation_short_name = NULL;
+
+_END_GOOGLE_NAMESPACE_
+
+// The following APIs are all internal.
+#ifdef HAVE_STACKTRACE
+
+#include "stacktrace.h"
+#include "symbolize.h"
+#include "base/commandlineflags.h"
+
+GLOG_DEFINE_bool(symbolize_stacktrace, true,
+                 "Symbolize the stack trace in the tombstone");
+
+_START_GOOGLE_NAMESPACE_
+
+typedef void DebugWriter(const char*, void*);
+
+// The %p field width for printf() functions is two characters per byte.
+// For some environments, add two extra bytes for the leading "0x".
+static const int kPrintfPointerFieldWidth = 2 + 2 * sizeof(void*);
+
+static void DebugWriteToStderr(const char* data, void *) {
+  // This one is signal-safe.
+  if (write(STDERR_FILENO, data, strlen(data)) < 0) {
+    // Ignore errors.
+  }
+}
+
+static void DebugWriteToString(const char* data, void *arg) {
+  reinterpret_cast<string*>(arg)->append(data);
+}
+
+#ifdef HAVE_SYMBOLIZE
+// Print a program counter and its symbol name.
+static void DumpPCAndSymbol(DebugWriter *writerfn, void *arg, void *pc,
+                            const char * const prefix) {
+  char tmp[1024];
+  const char *symbol = "(unknown)";
+  // Symbolizes the previous address of pc because pc may be in the
+  // next function.  The overrun happens when the function ends with
+  // a call to a function annotated noreturn (e.g. CHECK).
+  if (Symbolize(reinterpret_cast<char *>(pc) - 1, tmp, sizeof(tmp))) {
+      symbol = tmp;
+  }
+  char buf[1024];
+  snprintf(buf, sizeof(buf), "%s@ %*p  %s\n",
+           prefix, kPrintfPointerFieldWidth, pc, symbol);
+  writerfn(buf, arg);
+}
+#endif
+
+static void DumpPC(DebugWriter *writerfn, void *arg, void *pc,
+                   const char * const prefix) {
+  char buf[100];
+  snprintf(buf, sizeof(buf), "%s@ %*p\n",
+           prefix, kPrintfPointerFieldWidth, pc);
+  writerfn(buf, arg);
+}
+
+// Dump current stack trace as directed by writerfn
+static void DumpStackTrace(int skip_count, DebugWriter *writerfn, void *arg) {
+  // Print stack trace
+  void* stack[32];
+  int depth = GetStackTrace(stack, ARRAYSIZE(stack), skip_count+1);
+  for (int i = 0; i < depth; i++) {
+#if defined(HAVE_SYMBOLIZE)
+    if (FLAGS_symbolize_stacktrace) {
+      DumpPCAndSymbol(writerfn, arg, stack[i], "    ");
+    } else {
+      DumpPC(writerfn, arg, stack[i], "    ");
+    }
+#else
+    DumpPC(writerfn, arg, stack[i], "    ");
+#endif
+  }
+}
+
+static void DumpStackTraceAndExit() {
+  DumpStackTrace(1, DebugWriteToStderr, NULL);
+
+  // TODO(hamaji): Use signal instead of sigaction?
+  if (IsFailureSignalHandlerInstalled()) {
+    // Set the default signal handler for SIGABRT, to avoid invoking our
+    // own signal handler installed by InstallFailureSignalHandler().
+#ifdef HAVE_SIGACTION
+    struct sigaction sig_action;
+    memset(&sig_action, 0, sizeof(sig_action));
+    sigemptyset(&sig_action.sa_mask);
+    sig_action.sa_handler = SIG_DFL;
+    sigaction(SIGABRT, &sig_action, NULL);
+#elif defined(OS_WINDOWS)
+    signal(SIGABRT, SIG_DFL);
+#endif  // HAVE_SIGACTION
+  }
+
+  abort();
+}
+
+_END_GOOGLE_NAMESPACE_
+
+#endif  // HAVE_STACKTRACE
+
+_START_GOOGLE_NAMESPACE_
+
+namespace glog_internal_namespace_ {
+
+const char* ProgramInvocationShortName() {
+  if (g_program_invocation_short_name != NULL) {
+    return g_program_invocation_short_name;
+  } else {
+    // TODO(hamaji): Use /proc/self/cmdline and so?
+    return "UNKNOWN";
+  }
+}
+
+bool IsGoogleLoggingInitialized() {
+  return g_program_invocation_short_name != NULL;
+}
+
+#ifdef OS_WINDOWS
+struct timeval {
+  long tv_sec, tv_usec;
+};
+
+// Based on: http://www.google.com/codesearch/p?hl=en#dR3YEbitojA/os_win32.c&q=GetSystemTimeAsFileTime%20license:bsd
+// See COPYING for copyright information.
+static int gettimeofday(struct timeval *tv, void* tz) {
+#define EPOCHFILETIME (116444736000000000ULL)
+  FILETIME ft;
+  LARGE_INTEGER li;
+  uint64 tt;
+
+  GetSystemTimeAsFileTime(&ft);
+  li.LowPart = ft.dwLowDateTime;
+  li.HighPart = ft.dwHighDateTime;
+  tt = (li.QuadPart - EPOCHFILETIME) / 10;
+  tv->tv_sec = tt / 1000000;
+  tv->tv_usec = tt % 1000000;
+
+  return 0;
+}
+#endif
+
+int64 CycleClock_Now() {
+  // TODO(hamaji): temporary impementation - it might be too slow.
+  struct timeval tv;
+  gettimeofday(&tv, NULL);
+  return static_cast<int64>(tv.tv_sec) * 1000000 + tv.tv_usec;
+}
+
+int64 UsecToCycles(int64 usec) {
+  return usec;
+}
+
+WallTime WallTime_Now() {
+  // Now, cycle clock is retuning microseconds since the epoch.
+  return CycleClock_Now() * 0.000001;
+}
+
+static int32 g_main_thread_pid = getpid();
+int32 GetMainThreadPid() {
+  return g_main_thread_pid;
+}
+
+bool PidHasChanged() {
+  int32 pid = getpid();
+  if (g_main_thread_pid == pid) {
+    return false;
+  }
+  g_main_thread_pid = pid;
+  return true;
+}
+
+pid_t GetTID() {
+  // On Linux and MacOSX, we try to use gettid().
+#if defined OS_LINUX || defined OS_MACOSX
+#ifndef __NR_gettid
+#ifdef OS_MACOSX
+#define __NR_gettid SYS_gettid
+#elif ! defined __i386__
+#error "Must define __NR_gettid for non-x86 platforms"
+#else
+#define __NR_gettid 224
+#endif
+#endif
+  static bool lacks_gettid = false;
+  if (!lacks_gettid) {
+    pid_t tid = syscall(__NR_gettid);
+    if (tid != -1) {
+      return tid;
+    }
+    // Technically, this variable has to be volatile, but there is a small
+    // performance penalty in accessing volatile variables and there should
+    // not be any serious adverse effect if a thread does not immediately see
+    // the value change to "true".
+    lacks_gettid = true;
+  }
+#endif  // OS_LINUX || OS_MACOSX
+
+  // If gettid() could not be used, we use one of the following.
+#if defined OS_LINUX
+  return getpid();  // Linux:  getpid returns thread ID when gettid is absent
+#elif defined OS_WINDOWS && !defined OS_CYGWIN
+  return GetCurrentThreadId();
+#elif defined(HAVE_PTHREAD)
+  // If none of the techniques above worked, we use pthread_self().
+  return (pid_t)(uintptr_t)pthread_self();
+#else
+  return -1;
+#endif
+}
+
+const char* const_basename(const char* filepath) {
+  const char* base = strrchr(filepath, '/');
+#ifdef OS_WINDOWS  // Look for either path separator in Windows
+  if (!base)
+    base = strrchr(filepath, '\\');
+#endif
+  return base ? (base+1) : filepath;
+}
+
+static string g_my_user_name;
+const string& MyUserName() {
+  return g_my_user_name;
+}
+static void MyUserNameInitializer() {
+  // TODO(hamaji): Probably this is not portable.
+#if defined(OS_WINDOWS)
+  const char* user = getenv("USERNAME");
+#else
+  const char* user = getenv("USER");
+#endif
+  if (user != NULL) {
+    g_my_user_name = user;
+  } else {
+#if defined(HAVE_PWD_H) && defined(HAVE_UNISTD_H)
+    struct passwd pwd;
+    struct passwd* result = NULL;
+    char buffer[1024] = {'\0'};
+    uid_t uid = geteuid();
+    int pwuid_res = getpwuid_r(uid, &pwd, buffer, sizeof(buffer), &result);
+    if (pwuid_res == 0 && result) {
+      g_my_user_name = pwd.pw_name;
+    } else {
+      snprintf(buffer, sizeof(buffer), "uid%d", uid);
+      g_my_user_name = buffer;
+    }
+#endif
+    if (g_my_user_name.empty()) {
+      g_my_user_name = "invalid-user";
+    }
+  }
+
+}
+REGISTER_MODULE_INITIALIZER(utilities, MyUserNameInitializer());
+
+#ifdef HAVE_STACKTRACE
+void DumpStackTraceToString(string* stacktrace) {
+  DumpStackTrace(1, DebugWriteToString, stacktrace);
+}
+#endif
+
+// We use an atomic operation to prevent problems with calling CrashReason
+// from inside the Mutex implementation (potentially through RAW_CHECK).
+static const CrashReason* g_reason = 0;
+
+void SetCrashReason(const CrashReason* r) {
+  sync_val_compare_and_swap(&g_reason,
+                            reinterpret_cast<const CrashReason*>(0),
+                            r);
+}
+
+void InitGoogleLoggingUtilities(const char* argv0) {
+  CHECK(!IsGoogleLoggingInitialized())
+      << "You called InitGoogleLogging() twice!";
+  const char* slash = strrchr(argv0, '/');
+#ifdef OS_WINDOWS
+  if (!slash)  slash = strrchr(argv0, '\\');
+#endif
+  g_program_invocation_short_name = slash ? slash + 1 : argv0;
+
+#ifdef HAVE_STACKTRACE
+  InstallFailureFunction(&DumpStackTraceAndExit);
+#endif
+}
+
+void ShutdownGoogleLoggingUtilities() {
+  CHECK(IsGoogleLoggingInitialized())
+      << "You called ShutdownGoogleLogging() without calling InitGoogleLogging() first!";
+  g_program_invocation_short_name = NULL;
+#ifdef HAVE_SYSLOG_H
+  closelog();
+#endif
+}
+
+}  // namespace glog_internal_namespace_
+
+_END_GOOGLE_NAMESPACE_
+
+// Make an implementation of stacktrace compiled.
+#ifdef STACKTRACE_H
+# include STACKTRACE_H
+# if 0
+// For include scanners which can't handle macro expansions.
+#  include "stacktrace_libunwind-inl.h"
+#  include "stacktrace_x86-inl.h"
+#  include "stacktrace_x86_64-inl.h"
+#  include "stacktrace_powerpc-inl.h"
+#  include "stacktrace_generic-inl.h"
+# endif
+#endif
diff --git a/src/utilities.h b/src/utilities.h
new file mode 100644
index 000000000000..c66f91467d06
--- /dev/null
+++ b/src/utilities.h
@@ -0,0 +1,238 @@
+// Copyright (c) 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Author: Shinichiro Hamaji
+//
+// Define utilties for glog internal usage.
+
+#ifndef UTILITIES_H__
+#define UTILITIES_H__
+
+#if defined(WIN32) || defined(_WIN32) || defined(__WIN32__)
+# define OS_WINDOWS
+#elif defined(__CYGWIN__) || defined(__CYGWIN32__)
+# define OS_CYGWIN
+#elif defined(linux) || defined(__linux) || defined(__linux__)
+# ifndef OS_LINUX
+#  define OS_LINUX
+# endif
+#elif defined(macintosh) || defined(__APPLE__) || defined(__APPLE_CC__)
+# define OS_MACOSX
+#elif defined(__FreeBSD__)
+# define OS_FREEBSD
+#elif defined(__NetBSD__)
+# define OS_NETBSD
+#elif defined(__OpenBSD__)
+# define OS_OPENBSD
+#else
+// TODO(hamaji): Add other platforms.
+#endif
+
+// printf macros for size_t, in the style of inttypes.h
+#ifdef _LP64
+#define __PRIS_PREFIX "z"
+#else
+#define __PRIS_PREFIX
+#endif
+
+// Use these macros after a % in a printf format string
+// to get correct 32/64 bit behavior, like this:
+// size_t size = records.size();
+// printf("%"PRIuS"\n", size);
+
+#define PRIdS __PRIS_PREFIX "d"
+#define PRIxS __PRIS_PREFIX "x"
+#define PRIuS __PRIS_PREFIX "u"
+#define PRIXS __PRIS_PREFIX "X"
+#define PRIoS __PRIS_PREFIX "o"
+
+#include "base/mutex.h"  // This must go first so we get _XOPEN_SOURCE
+
+#include <string>
+
+#if defined(OS_WINDOWS)
+# include "port.h"
+#endif
+
+#include "config.h"
+#include "glog/logging.h"
+
+// There are three different ways we can try to get the stack trace:
+//
+// 1) The libunwind library.  This is still in development, and as a
+//    separate library adds a new dependency, but doesn't need a frame
+//    pointer.  It also doesn't call malloc.
+//
+// 2) Our hand-coded stack-unwinder.  This depends on a certain stack
+//    layout, which is used by gcc (and those systems using a
+//    gcc-compatible ABI) on x86 systems, at least since gcc 2.95.
+//    It uses the frame pointer to do its work.
+//
+// 3) The gdb unwinder -- also the one used by the c++ exception code.
+//    It's obviously well-tested, but has a fatal flaw: it can call
+//    malloc() from the unwinder.  This is a problem because we're
+//    trying to use the unwinder to instrument malloc().
+//
+// 4) The Windows API CaptureStackTrace.
+//
+// Note: if you add a new implementation here, make sure it works
+// correctly when GetStackTrace() is called with max_depth == 0.
+// Some code may do that.
+
+#if defined(HAVE_LIB_UNWIND)
+# define STACKTRACE_H "stacktrace_libunwind-inl.h"
+#elif !defined(NO_FRAME_POINTER)
+# if defined(__i386__) && __GNUC__ >= 2
+#  define STACKTRACE_H "stacktrace_x86-inl.h"
+# elif defined(__x86_64__) && __GNUC__ >= 2 && HAVE_UNWIND_H
+#  define STACKTRACE_H "stacktrace_x86_64-inl.h"
+# elif (defined(__ppc__) || defined(__PPC__)) && __GNUC__ >= 2
+#  define STACKTRACE_H "stacktrace_powerpc-inl.h"
+# elif defined(OS_WINDOWS)
+#  define STACKTRACE_H "stacktrace_windows-inl.h"
+# endif
+#endif
+
+#if !defined(STACKTRACE_H) && defined(HAVE_EXECINFO_H)
+# define STACKTRACE_H "stacktrace_generic-inl.h"
+#endif
+
+#if defined(STACKTRACE_H)
+# define HAVE_STACKTRACE
+#endif
+
+#ifndef HAVE_SYMBOLIZE
+// defined by gcc
+#if defined(__ELF__) && defined(OS_LINUX)
+# define HAVE_SYMBOLIZE
+#elif defined(OS_MACOSX) && defined(HAVE_DLADDR)
+// Use dladdr to symbolize.
+# define HAVE_SYMBOLIZE
+#elif defined(OS_WINDOWS)
+// Use DbgHelp to symbolize
+# define HAVE_SYMBOLIZE
+#endif
+#endif // !defined(HAVE_SYMBOLIZE)
+
+#ifndef ARRAYSIZE
+// There is a better way, but this is good enough for our purpose.
+# define ARRAYSIZE(a) (sizeof(a) / sizeof(*(a)))
+#endif
+
+_START_GOOGLE_NAMESPACE_
+
+namespace glog_internal_namespace_ {
+
+#ifdef HAVE___ATTRIBUTE__
+# define ATTRIBUTE_NOINLINE __attribute__ ((noinline))
+# define HAVE_ATTRIBUTE_NOINLINE
+#elif defined(OS_WINDOWS)
+# define ATTRIBUTE_NOINLINE __declspec(noinline)
+# define HAVE_ATTRIBUTE_NOINLINE
+#else
+# define ATTRIBUTE_NOINLINE
+#endif
+
+const char* ProgramInvocationShortName();
+
+bool IsGoogleLoggingInitialized();
+
+int64 CycleClock_Now();
+
+int64 UsecToCycles(int64 usec);
+
+typedef double WallTime;
+WallTime WallTime_Now();
+
+int32 GetMainThreadPid();
+bool PidHasChanged();
+
+pid_t GetTID();
+
+const std::string& MyUserName();
+
+// Get the part of filepath after the last path separator.
+// (Doesn't modify filepath, contrary to basename() in libgen.h.)
+const char* const_basename(const char* filepath);
+
+// Wrapper of __sync_val_compare_and_swap. If the GCC extension isn't
+// defined, we try the CPU specific logics (we only support x86 and
+// x86_64 for now) first, then use a naive implementation, which has a
+// race condition.
+template<typename T>
+inline T sync_val_compare_and_swap(T* ptr, T oldval, T newval) {
+#if defined(HAVE___SYNC_VAL_COMPARE_AND_SWAP)
+  return __sync_val_compare_and_swap(ptr, oldval, newval);
+#elif defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
+  T ret;
+  __asm__ __volatile__("lock; cmpxchg %1, (%2);"
+                       :"=a"(ret)
+                        // GCC may produces %sil or %dil for
+                        // constraint "r", but some of apple's gas
+                        // dosn't know the 8 bit registers.
+                        // We use "q" to avoid these registers.
+                       :"q"(newval), "q"(ptr), "a"(oldval)
+                       :"memory", "cc");
+  return ret;
+#else
+  T ret = *ptr;
+  if (ret == oldval) {
+    *ptr = newval;
+  }
+  return ret;
+#endif
+}
+
+void DumpStackTraceToString(std::string* stacktrace);
+
+struct CrashReason {
+  CrashReason() : filename(0), line_number(0), message(0), depth(0) {}
+
+  const char* filename;
+  int line_number;
+  const char* message;
+
+  // We'll also store a bit of stack trace context at the time of crash as
+  // it may not be available later on.
+  void* stack[32];
+  int depth;
+};
+
+void SetCrashReason(const CrashReason* r);
+
+void InitGoogleLoggingUtilities(const char* argv0);
+void ShutdownGoogleLoggingUtilities();
+
+}  // namespace glog_internal_namespace_
+
+_END_GOOGLE_NAMESPACE_
+
+using namespace GOOGLE_NAMESPACE::glog_internal_namespace_;
+
+#endif  // UTILITIES_H__
diff --git a/src/utilities_unittest.cc b/src/utilities_unittest.cc
new file mode 100644
index 000000000000..38e847dfbf75
--- /dev/null
+++ b/src/utilities_unittest.cc
@@ -0,0 +1,58 @@
+// Copyright (c) 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Author: Shinichiro Hamaji
+#include "utilities.h"
+#include "googletest.h"
+#include "glog/logging.h"
+
+#ifdef HAVE_LIB_GFLAGS
+#include <gflags/gflags.h>
+using namespace GFLAGS_NAMESPACE;
+#endif
+
+using namespace GOOGLE_NAMESPACE;
+
+TEST(utilities, sync_val_compare_and_swap) {
+  bool now_entering = false;
+  EXPECT_FALSE(sync_val_compare_and_swap(&now_entering, false, true));
+  EXPECT_TRUE(sync_val_compare_and_swap(&now_entering, false, true));
+  EXPECT_TRUE(sync_val_compare_and_swap(&now_entering, false, true));
+}
+
+TEST(utilities, InitGoogleLoggingDeathTest) {
+  ASSERT_DEATH(InitGoogleLogging("foobar"), "");
+}
+
+int main(int argc, char **argv) {
+  InitGoogleLogging(argv[0]);
+  InitGoogleTest(&argc, argv);
+
+  CHECK_EQ(RUN_ALL_TESTS(), 0);
+}
diff --git a/src/vlog_is_on.cc b/src/vlog_is_on.cc
new file mode 100644
index 000000000000..e8fdbae7dcba
--- /dev/null
+++ b/src/vlog_is_on.cc
@@ -0,0 +1,257 @@
+// Copyright (c) 1999, 2007, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Author: Ray Sidney and many others
+//
+// Broken out from logging.cc by Soren Lassen
+// logging_unittest.cc covers the functionality herein
+
+#include "utilities.h"
+
+#include <string.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <cstdio>
+#include <string>
+#include "base/commandlineflags.h"
+#include "glog/logging.h"
+#include "glog/raw_logging.h"
+#include "base/googleinit.h"
+
+// glog doesn't have annotation
+#define ANNOTATE_BENIGN_RACE(address, description)
+
+using std::string;
+
+GLOG_DEFINE_int32(v, 0, "Show all VLOG(m) messages for m <= this."
+" Overridable by --vmodule.");
+
+GLOG_DEFINE_string(vmodule, "", "per-module verbose level."
+" Argument is a comma-separated list of <module name>=<log level>."
+" <module name> is a glob pattern, matched against the filename base"
+" (that is, name ignoring .cc/.h./-inl.h)."
+" <log level> overrides any value given by --v.");
+
+_START_GOOGLE_NAMESPACE_
+
+namespace glog_internal_namespace_ {
+
+// Used by logging_unittests.cc so can't make it static here.
+GOOGLE_GLOG_DLL_DECL bool SafeFNMatch_(const char* pattern,
+                                       size_t patt_len,
+                                       const char* str,
+                                       size_t str_len);
+
+// Implementation of fnmatch that does not need 0-termination
+// of arguments and does not allocate any memory,
+// but we only support "*" and "?" wildcards, not the "[...]" patterns.
+// It's not a static function for the unittest.
+GOOGLE_GLOG_DLL_DECL bool SafeFNMatch_(const char* pattern,
+                                       size_t patt_len,
+                                       const char* str,
+                                       size_t str_len) {
+  size_t p = 0;
+  size_t s = 0;
+  while (1) {
+    if (p == patt_len  &&  s == str_len) return true;
+    if (p == patt_len) return false;
+    if (s == str_len) return p+1 == patt_len  &&  pattern[p] == '*';
+    if (pattern[p] == str[s]  ||  pattern[p] == '?') {
+      p += 1;
+      s += 1;
+      continue;
+    }
+    if (pattern[p] == '*') {
+      if (p+1 == patt_len) return true;
+      do {
+        if (SafeFNMatch_(pattern+(p+1), patt_len-(p+1), str+s, str_len-s)) {
+          return true;
+        }
+        s += 1;
+      } while (s != str_len);
+      return false;
+    }
+    return false;
+  }
+}
+
+}  // namespace glog_internal_namespace_
+
+using glog_internal_namespace_::SafeFNMatch_;
+
+int32 kLogSiteUninitialized = 1000;
+
+// List of per-module log levels from FLAGS_vmodule.
+// Once created each element is never deleted/modified
+// except for the vlog_level: other threads will read VModuleInfo blobs
+// w/o locks and we'll store pointers to vlog_level at VLOG locations
+// that will never go away.
+// We can't use an STL struct here as we wouldn't know
+// when it's safe to delete/update it: other threads need to use it w/o locks.
+struct VModuleInfo {
+  string module_pattern;
+  mutable int32 vlog_level;  // Conceptually this is an AtomicWord, but it's
+                             // too much work to use AtomicWord type here
+                             // w/o much actual benefit.
+  const VModuleInfo* next;
+};
+
+// This protects the following global variables.
+static Mutex vmodule_lock;
+// Pointer to head of the VModuleInfo list.
+// It's a map from module pattern to logging level for those module(s).
+static VModuleInfo* vmodule_list = 0;
+// Boolean initialization flag.
+static bool inited_vmodule = false;
+
+// L >= vmodule_lock.
+static void VLOG2Initializer() {
+  vmodule_lock.AssertHeld();
+  // Can now parse --vmodule flag and initialize mapping of module-specific
+  // logging levels.
+  inited_vmodule = false;
+  const char* vmodule = FLAGS_vmodule.c_str();
+  const char* sep;
+  VModuleInfo* head = NULL;
+  VModuleInfo* tail = NULL;
+  while ((sep = strchr(vmodule, '=')) != NULL) {
+    string pattern(vmodule, sep - vmodule);
+    int module_level;
+    if (sscanf(sep, "=%d", &module_level) == 1) {
+      VModuleInfo* info = new VModuleInfo;
+      info->module_pattern = pattern;
+      info->vlog_level = module_level;
+      if (head)  tail->next = info;
+      else  head = info;
+      tail = info;
+    }
+    // Skip past this entry
+    vmodule = strchr(sep, ',');
+    if (vmodule == NULL) break;
+    vmodule++;  // Skip past ","
+  }
+  if (head) {  // Put them into the list at the head:
+    tail->next = vmodule_list;
+    vmodule_list = head;
+  }
+  inited_vmodule = true;
+}
+
+// This can be called very early, so we use SpinLock and RAW_VLOG here.
+int SetVLOGLevel(const char* module_pattern, int log_level) {
+  int result = FLAGS_v;
+  int const pattern_len = strlen(module_pattern);
+  bool found = false;
+  {
+    MutexLock l(&vmodule_lock);  // protect whole read-modify-write
+    for (const VModuleInfo* info = vmodule_list;
+         info != NULL; info = info->next) {
+      if (info->module_pattern == module_pattern) {
+        if (!found) {
+          result = info->vlog_level;
+          found = true;
+        }
+        info->vlog_level = log_level;
+      } else if (!found  &&
+                 SafeFNMatch_(info->module_pattern.c_str(),
+                              info->module_pattern.size(),
+                              module_pattern, pattern_len)) {
+        result = info->vlog_level;
+        found = true;
+      }
+    }
+    if (!found) {
+      VModuleInfo* info = new VModuleInfo;
+      info->module_pattern = module_pattern;
+      info->vlog_level = log_level;
+      info->next = vmodule_list;
+      vmodule_list = info;
+    }
+  }
+  RAW_VLOG(1, "Set VLOG level for \"%s\" to %d", module_pattern, log_level);
+  return result;
+}
+
+// NOTE: Individual VLOG statements cache the integer log level pointers.
+// NOTE: This function must not allocate memory or require any locks.
+bool InitVLOG3__(int32** site_flag, int32* site_default,
+                 const char* fname, int32 verbose_level) {
+  MutexLock l(&vmodule_lock);
+  bool read_vmodule_flag = inited_vmodule;
+  if (!read_vmodule_flag) {
+    VLOG2Initializer();
+  }
+
+  // protect the errno global in case someone writes:
+  // VLOG(..) << "The last error was " << strerror(errno)
+  int old_errno = errno;
+
+  // site_default normally points to FLAGS_v
+  int32* site_flag_value = site_default;
+
+  // Get basename for file
+  const char* base = strrchr(fname, '/');
+  base = base ? (base+1) : fname;
+  const char* base_end = strchr(base, '.');
+  size_t base_length = base_end ? size_t(base_end - base) : strlen(base);
+
+  // Trim out trailing "-inl" if any
+  if (base_length >= 4 && (memcmp(base+base_length-4, "-inl", 4) == 0)) {
+    base_length -= 4;
+  }
+
+  // TODO: Trim out _unittest suffix?  Perhaps it is better to have
+  // the extra control and just leave it there.
+
+  // find target in vector of modules, replace site_flag_value with
+  // a module-specific verbose level, if any.
+  for (const VModuleInfo* info = vmodule_list;
+       info != NULL; info = info->next) {
+    if (SafeFNMatch_(info->module_pattern.c_str(), info->module_pattern.size(),
+                     base, base_length)) {
+      site_flag_value = &info->vlog_level;
+        // value at info->vlog_level is now what controls
+        // the VLOG at the caller site forever
+      break;
+    }
+  }
+
+  // Cache the vlog value pointer if --vmodule flag has been parsed.
+  ANNOTATE_BENIGN_RACE(site_flag,
+                       "*site_flag may be written by several threads,"
+                       " but the value will be the same");
+  if (read_vmodule_flag) *site_flag = site_flag_value;
+
+  // restore the errno in case something recoverable went wrong during
+  // the initialization of the VLOG mechanism (see above note "protect the..")
+  errno = old_errno;
+  return *site_flag_value >= verbose_level;
+}
+
+_END_GOOGLE_NAMESPACE_
diff --git a/src/windows/config.h b/src/windows/config.h
new file mode 100755
index 000000000000..2d23fb08159d
--- /dev/null
+++ b/src/windows/config.h
@@ -0,0 +1,21 @@
+/* src/config.h.in.  Generated from configure.ac by autoheader.  */
+
+/* Namespace for Google classes */
+#define GOOGLE_NAMESPACE google
+
+/* Stops putting the code inside the Google namespace */
+#define _END_GOOGLE_NAMESPACE_ }
+
+/* Puts following code inside the Google namespace */
+#define _START_GOOGLE_NAMESPACE_ namespace google {
+
+/* Always the empty-string on non-windows systems. On windows, should be
+   "__declspec(dllexport)". This way, when we compile the dll, we export our
+   functions/classes. It's safe to define this here because config.h is only
+   used internally, to compile the DLL, and every DLL source file #includes
+   "config.h" before anything else. */
+#ifndef GOOGLE_GLOG_DLL_DECL
+# define GOOGLE_GLOG_IS_A_DLL  1   /* not set if you're statically linking */
+# define GOOGLE_GLOG_DLL_DECL  __declspec(dllexport)
+# define GOOGLE_GLOG_DLL_DECL_FOR_UNITTESTS  __declspec(dllimport)
+#endif
diff --git a/src/windows/dirent.h b/src/windows/dirent.h
new file mode 100644
index 000000000000..f7a46dafcbf1
--- /dev/null
+++ b/src/windows/dirent.h
@@ -0,0 +1,1160 @@
+/*
+ * Dirent interface for Microsoft Visual Studio
+ *
+ * Copyright (C) 1998-2019 Toni Ronkko
+ * This file is part of dirent.  Dirent may be freely distributed
+ * under the MIT license.  For all details and documentation, see
+ * https://github.com/tronkko/dirent
+ */
+#ifndef DIRENT_H
+#define DIRENT_H
+
+/* Hide warnings about unreferenced local functions */
+#if defined(__clang__)
+#   pragma clang diagnostic ignored "-Wunused-function"
+#elif defined(_MSC_VER)
+#   pragma warning(disable:4505)
+#elif defined(__GNUC__)
+#   pragma GCC diagnostic ignored "-Wunused-function"
+#endif
+
+/*
+ * Include windows.h without Windows Sockets 1.1 to prevent conflicts with
+ * Windows Sockets 2.0.
+ */
+#ifndef WIN32_LEAN_AND_MEAN
+#   define WIN32_LEAN_AND_MEAN
+#endif
+#include <windows.h>
+
+#include <stdio.h>
+#include <stdarg.h>
+#include <wchar.h>
+#include <string.h>
+#include <stdlib.h>
+#include <malloc.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <errno.h>
+
+/* Indicates that d_type field is available in dirent structure */
+#define _DIRENT_HAVE_D_TYPE
+
+/* Indicates that d_namlen field is available in dirent structure */
+#define _DIRENT_HAVE_D_NAMLEN
+
+/* Entries missing from MSVC 6.0 */
+#if !defined(FILE_ATTRIBUTE_DEVICE)
+#   define FILE_ATTRIBUTE_DEVICE 0x40
+#endif
+
+/* File type and permission flags for stat(), general mask */
+#if !defined(S_IFMT)
+#   define S_IFMT _S_IFMT
+#endif
+
+/* Directory bit */
+#if !defined(S_IFDIR)
+#   define S_IFDIR _S_IFDIR
+#endif
+
+/* Character device bit */
+#if !defined(S_IFCHR)
+#   define S_IFCHR _S_IFCHR
+#endif
+
+/* Pipe bit */
+#if !defined(S_IFFIFO)
+#   define S_IFFIFO _S_IFFIFO
+#endif
+
+/* Regular file bit */
+#if !defined(S_IFREG)
+#   define S_IFREG _S_IFREG
+#endif
+
+/* Read permission */
+#if !defined(S_IREAD)
+#   define S_IREAD _S_IREAD
+#endif
+
+/* Write permission */
+#if !defined(S_IWRITE)
+#   define S_IWRITE _S_IWRITE
+#endif
+
+/* Execute permission */
+#if !defined(S_IEXEC)
+#   define S_IEXEC _S_IEXEC
+#endif
+
+/* Pipe */
+#if !defined(S_IFIFO)
+#   define S_IFIFO _S_IFIFO
+#endif
+
+/* Block device */
+#if !defined(S_IFBLK)
+#   define S_IFBLK 0
+#endif
+
+/* Link */
+#if !defined(S_IFLNK)
+#   define S_IFLNK 0
+#endif
+
+/* Socket */
+#if !defined(S_IFSOCK)
+#   define S_IFSOCK 0
+#endif
+
+/* Read user permission */
+#if !defined(S_IRUSR)
+#   define S_IRUSR S_IREAD
+#endif
+
+/* Write user permission */
+#if !defined(S_IWUSR)
+#   define S_IWUSR S_IWRITE
+#endif
+
+/* Execute user permission */
+#if !defined(S_IXUSR)
+#   define S_IXUSR 0
+#endif
+
+/* Read group permission */
+#if !defined(S_IRGRP)
+#   define S_IRGRP 0
+#endif
+
+/* Write group permission */
+#if !defined(S_IWGRP)
+#   define S_IWGRP 0
+#endif
+
+/* Execute group permission */
+#if !defined(S_IXGRP)
+#   define S_IXGRP 0
+#endif
+
+/* Read others permission */
+#if !defined(S_IROTH)
+#   define S_IROTH 0
+#endif
+
+/* Write others permission */
+#if !defined(S_IWOTH)
+#   define S_IWOTH 0
+#endif
+
+/* Execute others permission */
+#if !defined(S_IXOTH)
+#   define S_IXOTH 0
+#endif
+
+/* Maximum length of file name */
+#if !defined(PATH_MAX)
+#   define PATH_MAX MAX_PATH
+#endif
+#if !defined(FILENAME_MAX)
+#   define FILENAME_MAX MAX_PATH
+#endif
+#if !defined(NAME_MAX)
+#   define NAME_MAX FILENAME_MAX
+#endif
+
+/* File type flags for d_type */
+#define DT_UNKNOWN 0
+#define DT_REG S_IFREG
+#define DT_DIR S_IFDIR
+#define DT_FIFO S_IFIFO
+#define DT_SOCK S_IFSOCK
+#define DT_CHR S_IFCHR
+#define DT_BLK S_IFBLK
+#define DT_LNK S_IFLNK
+
+/* Macros for converting between st_mode and d_type */
+#define IFTODT(mode) ((mode) & S_IFMT)
+#define DTTOIF(type) (type)
+
+/*
+ * File type macros.  Note that block devices, sockets and links cannot be
+ * distinguished on Windows and the macros S_ISBLK, S_ISSOCK and S_ISLNK are
+ * only defined for compatibility.  These macros should always return false
+ * on Windows.
+ */
+#if !defined(S_ISFIFO)
+#   define S_ISFIFO(mode) (((mode) & S_IFMT) == S_IFIFO)
+#endif
+#if !defined(S_ISDIR)
+#   define S_ISDIR(mode) (((mode) & S_IFMT) == S_IFDIR)
+#endif
+#if !defined(S_ISREG)
+#   define S_ISREG(mode) (((mode) & S_IFMT) == S_IFREG)
+#endif
+#if !defined(S_ISLNK)
+#   define S_ISLNK(mode) (((mode) & S_IFMT) == S_IFLNK)
+#endif
+#if !defined(S_ISSOCK)
+#   define S_ISSOCK(mode) (((mode) & S_IFMT) == S_IFSOCK)
+#endif
+#if !defined(S_ISCHR)
+#   define S_ISCHR(mode) (((mode) & S_IFMT) == S_IFCHR)
+#endif
+#if !defined(S_ISBLK)
+#   define S_ISBLK(mode) (((mode) & S_IFMT) == S_IFBLK)
+#endif
+
+/* Return the exact length of the file name without zero terminator */
+#define _D_EXACT_NAMLEN(p) ((p)->d_namlen)
+
+/* Return the maximum size of a file name */
+#define _D_ALLOC_NAMLEN(p) ((PATH_MAX)+1)
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+/* Wide-character version */
+struct _wdirent {
+    /* Always zero */
+    long d_ino;
+
+    /* File position within stream */
+    long d_off;
+
+    /* Structure size */
+    unsigned short d_reclen;
+
+    /* Length of name without \0 */
+    size_t d_namlen;
+
+    /* File type */
+    int d_type;
+
+    /* File name */
+    wchar_t d_name[PATH_MAX+1];
+};
+typedef struct _wdirent _wdirent;
+
+struct _WDIR {
+    /* Current directory entry */
+    struct _wdirent ent;
+
+    /* Private file data */
+    WIN32_FIND_DATAW data;
+
+    /* True if data is valid */
+    int cached;
+
+    /* Win32 search handle */
+    HANDLE handle;
+
+    /* Initial directory name */
+    wchar_t *patt;
+};
+typedef struct _WDIR _WDIR;
+
+/* Multi-byte character version */
+struct dirent {
+    /* Always zero */
+    long d_ino;
+
+    /* File position within stream */
+    long d_off;
+
+    /* Structure size */
+    unsigned short d_reclen;
+
+    /* Length of name without \0 */
+    size_t d_namlen;
+
+    /* File type */
+    int d_type;
+
+    /* File name */
+    char d_name[PATH_MAX+1];
+};
+typedef struct dirent dirent;
+
+struct DIR {
+    struct dirent ent;
+    struct _WDIR *wdirp;
+};
+typedef struct DIR DIR;
+
+
+/* Dirent functions */
+static DIR *opendir (const char *dirname);
+static _WDIR *_wopendir (const wchar_t *dirname);
+
+static struct dirent *readdir (DIR *dirp);
+static struct _wdirent *_wreaddir (_WDIR *dirp);
+
+static int readdir_r(
+    DIR *dirp, struct dirent *entry, struct dirent **result);
+static int _wreaddir_r(
+    _WDIR *dirp, struct _wdirent *entry, struct _wdirent **result);
+
+static int closedir (DIR *dirp);
+static int _wclosedir (_WDIR *dirp);
+
+static void rewinddir (DIR* dirp);
+static void _wrewinddir (_WDIR* dirp);
+
+static int scandir (const char *dirname, struct dirent ***namelist,
+    int (*filter)(const struct dirent*),
+    int (*compare)(const struct dirent**, const struct dirent**));
+
+static int alphasort (const struct dirent **a, const struct dirent **b);
+
+static int versionsort (const struct dirent **a, const struct dirent **b);
+
+
+/* For compatibility with Symbian */
+#define wdirent _wdirent
+#define WDIR _WDIR
+#define wopendir _wopendir
+#define wreaddir _wreaddir
+#define wclosedir _wclosedir
+#define wrewinddir _wrewinddir
+
+
+/* Internal utility functions */
+static WIN32_FIND_DATAW *dirent_first (_WDIR *dirp);
+static WIN32_FIND_DATAW *dirent_next (_WDIR *dirp);
+
+static int dirent_mbstowcs_s(
+    size_t *pReturnValue,
+    wchar_t *wcstr,
+    size_t sizeInWords,
+    const char *mbstr,
+    size_t count);
+
+static int dirent_wcstombs_s(
+    size_t *pReturnValue,
+    char *mbstr,
+    size_t sizeInBytes,
+    const wchar_t *wcstr,
+    size_t count);
+
+static void dirent_set_errno (int error);
+
+
+/*
+ * Open directory stream DIRNAME for read and return a pointer to the
+ * internal working area that is used to retrieve individual directory
+ * entries.
+ */
+static _WDIR*
+_wopendir(
+    const wchar_t *dirname)
+{
+    _WDIR *dirp;
+    DWORD n;
+    wchar_t *p;
+
+    /* Must have directory name */
+    if (dirname == NULL  ||  dirname[0] == '\0') {
+        dirent_set_errno (ENOENT);
+        return NULL;
+    }
+
+    /* Allocate new _WDIR structure */
+    dirp = (_WDIR*) malloc (sizeof (struct _WDIR));
+    if (!dirp) {
+        return NULL;
+    }
+
+    /* Reset _WDIR structure */
+    dirp->handle = INVALID_HANDLE_VALUE;
+    dirp->patt = NULL;
+    dirp->cached = 0;
+
+    /*
+     * Compute the length of full path plus zero terminator
+     *
+     * Note that on WinRT there's no way to convert relative paths
+     * into absolute paths, so just assume it is an absolute path.
+     */
+#if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
+    /* Desktop */
+    n = GetFullPathNameW (dirname, 0, NULL, NULL);
+#else
+    /* WinRT */
+    n = wcslen (dirname);
+#endif
+
+    /* Allocate room for absolute directory name and search pattern */
+    dirp->patt = (wchar_t*) malloc (sizeof (wchar_t) * n + 16);
+    if (dirp->patt == NULL) {
+        goto exit_closedir;
+    }
+
+    /*
+     * Convert relative directory name to an absolute one.  This
+     * allows rewinddir() to function correctly even when current
+     * working directory is changed between opendir() and rewinddir().
+     *
+     * Note that on WinRT there's no way to convert relative paths
+     * into absolute paths, so just assume it is an absolute path.
+     */
+#if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
+    /* Desktop */
+    n = GetFullPathNameW (dirname, n, dirp->patt, NULL);
+    if (n <= 0) {
+        goto exit_closedir;
+    }
+#else
+    /* WinRT */
+    wcsncpy_s (dirp->patt, n+1, dirname, n);
+#endif
+
+    /* Append search pattern \* to the directory name */
+    p = dirp->patt + n;
+    switch (p[-1]) {
+    case '\\':
+    case '/':
+    case ':':
+        /* Directory ends in path separator, e.g. c:\temp\ */
+        /*NOP*/;
+        break;
+
+    default:
+        /* Directory name doesn't end in path separator */
+        *p++ = '\\';
+    }
+    *p++ = '*';
+    *p = '\0';
+
+    /* Open directory stream and retrieve the first entry */
+    if (!dirent_first (dirp)) {
+        goto exit_closedir;
+    }
+
+    /* Success */
+    return dirp;
+
+    /* Failure */
+exit_closedir:
+    _wclosedir (dirp);
+    return NULL;
+}
+
+/*
+ * Read next directory entry.
+ *
+ * Returns pointer to static directory entry which may be overwritten by
+ * subsequent calls to _wreaddir().
+ */
+static struct _wdirent*
+_wreaddir(
+    _WDIR *dirp)
+{
+    struct _wdirent *entry;
+
+    /*
+     * Read directory entry to buffer.  We can safely ignore the return value
+     * as entry will be set to NULL in case of error.
+     */
+    (void) _wreaddir_r (dirp, &dirp->ent, &entry);
+
+    /* Return pointer to statically allocated directory entry */
+    return entry;
+}
+
+/*
+ * Read next directory entry.
+ *
+ * Returns zero on success.  If end of directory stream is reached, then sets
+ * result to NULL and returns zero.
+ */
+static int
+_wreaddir_r(
+    _WDIR *dirp,
+    struct _wdirent *entry,
+    struct _wdirent **result)
+{
+    WIN32_FIND_DATAW *datap;
+
+    /* Read next directory entry */
+    datap = dirent_next (dirp);
+    if (datap) {
+        size_t n;
+        DWORD attr;
+
+        /*
+         * Copy file name as wide-character string.  If the file name is too
+         * long to fit in to the destination buffer, then truncate file name
+         * to PATH_MAX characters and zero-terminate the buffer.
+         */
+        n = 0;
+        while (n < PATH_MAX  &&  datap->cFileName[n] != 0) {
+            entry->d_name[n] = datap->cFileName[n];
+            n++;
+        }
+        entry->d_name[n] = 0;
+
+        /* Length of file name excluding zero terminator */
+        entry->d_namlen = n;
+
+        /* File type */
+        attr = datap->dwFileAttributes;
+        if ((attr & FILE_ATTRIBUTE_DEVICE) != 0) {
+            entry->d_type = DT_CHR;
+        } else if ((attr & FILE_ATTRIBUTE_DIRECTORY) != 0) {
+            entry->d_type = DT_DIR;
+        } else {
+            entry->d_type = DT_REG;
+        }
+
+        /* Reset dummy fields */
+        entry->d_ino = 0;
+        entry->d_off = 0;
+        entry->d_reclen = sizeof (struct _wdirent);
+
+        /* Set result address */
+        *result = entry;
+
+    } else {
+
+        /* Return NULL to indicate end of directory */
+        *result = NULL;
+
+    }
+
+    return /*OK*/0;
+}
+
+/*
+ * Close directory stream opened by opendir() function.  This invalidates the
+ * DIR structure as well as any directory entry read previously by
+ * _wreaddir().
+ */
+static int
+_wclosedir(
+    _WDIR *dirp)
+{
+    int ok;
+    if (dirp) {
+
+        /* Release search handle */
+        if (dirp->handle != INVALID_HANDLE_VALUE) {
+            FindClose (dirp->handle);
+        }
+
+        /* Release search pattern */
+        free (dirp->patt);
+
+        /* Release directory structure */
+        free (dirp);
+        ok = /*success*/0;
+
+    } else {
+
+        /* Invalid directory stream */
+        dirent_set_errno (EBADF);
+        ok = /*failure*/-1;
+
+    }
+    return ok;
+}
+
+/*
+ * Rewind directory stream such that _wreaddir() returns the very first
+ * file name again.
+ */
+static void
+_wrewinddir(
+    _WDIR* dirp)
+{
+    if (dirp) {
+        /* Release existing search handle */
+        if (dirp->handle != INVALID_HANDLE_VALUE) {
+            FindClose (dirp->handle);
+        }
+
+        /* Open new search handle */
+        dirent_first (dirp);
+    }
+}
+
+/* Get first directory entry (internal) */
+static WIN32_FIND_DATAW*
+dirent_first(
+    _WDIR *dirp)
+{
+    WIN32_FIND_DATAW *datap;
+    DWORD error;
+
+    /* Open directory and retrieve the first entry */
+    dirp->handle = FindFirstFileExW(
+        dirp->patt, FindExInfoStandard, &dirp->data,
+        FindExSearchNameMatch, NULL, 0);
+    if (dirp->handle != INVALID_HANDLE_VALUE) {
+
+        /* a directory entry is now waiting in memory */
+        datap = &dirp->data;
+        dirp->cached = 1;
+
+    } else {
+
+        /* Failed to open directory: no directory entry in memory */
+        dirp->cached = 0;
+        datap = NULL;
+
+        /* Set error code */
+        error = GetLastError ();
+        switch (error) {
+        case ERROR_ACCESS_DENIED:
+            /* No read access to directory */
+            dirent_set_errno (EACCES);
+            break;
+
+        case ERROR_DIRECTORY:
+            /* Directory name is invalid */
+            dirent_set_errno (ENOTDIR);
+            break;
+
+        case ERROR_PATH_NOT_FOUND:
+        default:
+            /* Cannot find the file */
+            dirent_set_errno (ENOENT);
+        }
+
+    }
+    return datap;
+}
+
+/*
+ * Get next directory entry (internal).
+ *
+ * Returns
+ */
+static WIN32_FIND_DATAW*
+dirent_next(
+    _WDIR *dirp)
+{
+    WIN32_FIND_DATAW *p;
+
+    /* Get next directory entry */
+    if (dirp->cached != 0) {
+
+        /* A valid directory entry already in memory */
+        p = &dirp->data;
+        dirp->cached = 0;
+
+    } else if (dirp->handle != INVALID_HANDLE_VALUE) {
+
+        /* Get the next directory entry from stream */
+        if (FindNextFileW (dirp->handle, &dirp->data) != FALSE) {
+            /* Got a file */
+            p = &dirp->data;
+        } else {
+            /* The very last entry has been processed or an error occurred */
+            FindClose (dirp->handle);
+            dirp->handle = INVALID_HANDLE_VALUE;
+            p = NULL;
+        }
+
+    } else {
+
+        /* End of directory stream reached */
+        p = NULL;
+
+    }
+
+    return p;
+}
+
+/*
+ * Open directory stream using plain old C-string.
+ */
+static DIR*
+opendir(
+    const char *dirname)
+{
+    struct DIR *dirp;
+
+    /* Must have directory name */
+    if (dirname == NULL  ||  dirname[0] == '\0') {
+        dirent_set_errno (ENOENT);
+        return NULL;
+    }
+
+    /* Allocate memory for DIR structure */
+    dirp = (DIR*) malloc (sizeof (struct DIR));
+    if (!dirp) {
+        return NULL;
+    }
+    {
+        int error;
+        wchar_t wname[PATH_MAX + 1];
+        size_t n;
+
+        /* Convert directory name to wide-character string */
+        error = dirent_mbstowcs_s(
+            &n, wname, PATH_MAX + 1, dirname, PATH_MAX + 1);
+        if (error) {
+            /*
+             * Cannot convert file name to wide-character string.  This
+             * occurs if the string contains invalid multi-byte sequences or
+             * the output buffer is too small to contain the resulting
+             * string.
+             */
+            goto exit_free;
+        }
+
+
+        /* Open directory stream using wide-character name */
+        dirp->wdirp = _wopendir (wname);
+        if (!dirp->wdirp) {
+            goto exit_free;
+        }
+
+    }
+
+    /* Success */
+    return dirp;
+
+    /* Failure */
+exit_free:
+    free (dirp);
+    return NULL;
+}
+
+/*
+ * Read next directory entry.
+ */
+static struct dirent*
+readdir(
+    DIR *dirp)
+{
+    struct dirent *entry;
+
+    /*
+     * Read directory entry to buffer.  We can safely ignore the return value
+     * as entry will be set to NULL in case of error.
+     */
+    (void) readdir_r (dirp, &dirp->ent, &entry);
+
+    /* Return pointer to statically allocated directory entry */
+    return entry;
+}
+
+/*
+ * Read next directory entry into called-allocated buffer.
+ *
+ * Returns zero on success.  If the end of directory stream is reached, then
+ * sets result to NULL and returns zero.
+ */
+static int
+readdir_r(
+    DIR *dirp,
+    struct dirent *entry,
+    struct dirent **result)
+{
+    WIN32_FIND_DATAW *datap;
+
+    /* Read next directory entry */
+    datap = dirent_next (dirp->wdirp);
+    if (datap) {
+        size_t n;
+        int error;
+
+        /* Attempt to convert file name to multi-byte string */
+        error = dirent_wcstombs_s(
+            &n, entry->d_name, PATH_MAX + 1, datap->cFileName, PATH_MAX + 1);
+
+        /*
+         * If the file name cannot be represented by a multi-byte string,
+         * then attempt to use old 8+3 file name.  This allows traditional
+         * Unix-code to access some file names despite of unicode
+         * characters, although file names may seem unfamiliar to the user.
+         *
+         * Be ware that the code below cannot come up with a short file
+         * name unless the file system provides one.  At least
+         * VirtualBox shared folders fail to do this.
+         */
+        if (error  &&  datap->cAlternateFileName[0] != '\0') {
+            error = dirent_wcstombs_s(
+                &n, entry->d_name, PATH_MAX + 1,
+                datap->cAlternateFileName, PATH_MAX + 1);
+        }
+
+        if (!error) {
+            DWORD attr;
+
+            /* Length of file name excluding zero terminator */
+            entry->d_namlen = n - 1;
+
+            /* File attributes */
+            attr = datap->dwFileAttributes;
+            if ((attr & FILE_ATTRIBUTE_DEVICE) != 0) {
+                entry->d_type = DT_CHR;
+            } else if ((attr & FILE_ATTRIBUTE_DIRECTORY) != 0) {
+                entry->d_type = DT_DIR;
+            } else {
+                entry->d_type = DT_REG;
+            }
+
+            /* Reset dummy fields */
+            entry->d_ino = 0;
+            entry->d_off = 0;
+            entry->d_reclen = sizeof (struct dirent);
+
+        } else {
+
+            /*
+             * Cannot convert file name to multi-byte string so construct
+             * an erroneous directory entry and return that.  Note that
+             * we cannot return NULL as that would stop the processing
+             * of directory entries completely.
+             */
+            entry->d_name[0] = '?';
+            entry->d_name[1] = '\0';
+            entry->d_namlen = 1;
+            entry->d_type = DT_UNKNOWN;
+            entry->d_ino = 0;
+            entry->d_off = -1;
+            entry->d_reclen = 0;
+
+        }
+
+        /* Return pointer to directory entry */
+        *result = entry;
+
+    } else {
+
+        /* No more directory entries */
+        *result = NULL;
+
+    }
+
+    return /*OK*/0;
+}
+
+/*
+ * Close directory stream.
+ */
+static int
+closedir(
+    DIR *dirp)
+{
+    int ok;
+    if (dirp) {
+
+        /* Close wide-character directory stream */
+        ok = _wclosedir (dirp->wdirp);
+        dirp->wdirp = NULL;
+
+        /* Release multi-byte character version */
+        free (dirp);
+
+    } else {
+
+        /* Invalid directory stream */
+        dirent_set_errno (EBADF);
+        ok = /*failure*/-1;
+
+    }
+    return ok;
+}
+
+/*
+ * Rewind directory stream to beginning.
+ */
+static void
+rewinddir(
+    DIR* dirp)
+{
+    /* Rewind wide-character string directory stream */
+    _wrewinddir (dirp->wdirp);
+}
+
+/*
+ * Scan directory for entries.
+ */
+static int
+scandir(
+    const char *dirname,
+    struct dirent ***namelist,
+    int (*filter)(const struct dirent*),
+    int (*compare)(const struct dirent**, const struct dirent**))
+{
+    struct dirent **files = NULL;
+    size_t size = 0;
+    size_t allocated = 0;
+    const size_t init_size = 1;
+    DIR *dir = NULL;
+    struct dirent *entry;
+    struct dirent *tmp = NULL;
+    size_t i;
+    int result = 0;
+
+    /* Open directory stream */
+    dir = opendir (dirname);
+    if (dir) {
+
+        /* Read directory entries to memory */
+        while (1) {
+
+            /* Enlarge pointer table to make room for another pointer */
+            if (size >= allocated) {
+                void *p;
+                size_t num_entries;
+
+                /* Compute number of entries in the enlarged pointer table */
+                if (size < init_size) {
+                    /* Allocate initial pointer table */
+                    num_entries = init_size;
+                } else {
+                    /* Double the size */
+                    num_entries = size * 2;
+                }
+
+                /* Allocate first pointer table or enlarge existing table */
+                p = realloc (files, sizeof (void*) * num_entries);
+                if (p != NULL) {
+                    /* Got the memory */
+                    files = (dirent**) p;
+                    allocated = num_entries;
+                } else {
+                    /* Out of memory */
+                    result = -1;
+                    break;
+                }
+
+            }
+
+            /* Allocate room for temporary directory entry */
+            if (tmp == NULL) {
+                tmp = (struct dirent*) malloc (sizeof (struct dirent));
+                if (tmp == NULL) {
+                    /* Cannot allocate temporary directory entry */
+                    result = -1;
+                    break;
+                }
+            }
+
+            /* Read directory entry to temporary area */
+            if (readdir_r (dir, tmp, &entry) == /*OK*/0) {
+
+                /* Did we get an entry? */
+                if (entry != NULL) {
+                    int pass;
+
+                    /* Determine whether to include the entry in result */
+                    if (filter) {
+                        /* Let the filter function decide */
+                        pass = filter (tmp);
+                    } else {
+                        /* No filter function, include everything */
+                        pass = 1;
+                    }
+
+                    if (pass) {
+                        /* Store the temporary entry to pointer table */
+                        files[size++] = tmp;
+                        tmp = NULL;
+
+                        /* Keep up with the number of files */
+                        result++;
+                    }
+
+                } else {
+
+                    /*
+                     * End of directory stream reached => sort entries and
+                     * exit.
+                     */
+                    qsort (files, size, sizeof (void*),
+                        (int (*) (const void*, const void*)) compare);
+                    break;
+
+                }
+
+            } else {
+                /* Error reading directory entry */
+                result = /*Error*/ -1;
+                break;
+            }
+
+        }
+
+    } else {
+        /* Cannot open directory */
+        result = /*Error*/ -1;
+    }
+
+    /* Release temporary directory entry */
+    free (tmp);
+
+    /* Release allocated memory on error */
+    if (result < 0) {
+        for (i = 0; i < size; i++) {
+            free (files[i]);
+        }
+        free (files);
+        files = NULL;
+    }
+
+    /* Close directory stream */
+    if (dir) {
+        closedir (dir);
+    }
+
+    /* Pass pointer table to caller */
+    if (namelist) {
+        *namelist = files;
+    }
+    return result;
+}
+
+/* Alphabetical sorting */
+static int
+alphasort(
+    const struct dirent **a, const struct dirent **b)
+{
+    return strcoll ((*a)->d_name, (*b)->d_name);
+}
+
+/* Sort versions */
+static int
+versionsort(
+    const struct dirent **a, const struct dirent **b)
+{
+    /* FIXME: implement strverscmp and use that */
+    return alphasort (a, b);
+}
+
+/* Convert multi-byte string to wide character string */
+static int
+dirent_mbstowcs_s(
+    size_t *pReturnValue,
+    wchar_t *wcstr,
+    size_t sizeInWords,
+    const char *mbstr,
+    size_t count)
+{
+    int error;
+
+#if defined(_MSC_VER)  &&  _MSC_VER >= 1400
+
+    /* Microsoft Visual Studio 2005 or later */
+    error = mbstowcs_s (pReturnValue, wcstr, sizeInWords, mbstr, count);
+
+#else
+
+    /* Older Visual Studio or non-Microsoft compiler */
+    size_t n;
+
+    /* Convert to wide-character string (or count characters) */
+    n = mbstowcs (wcstr, mbstr, sizeInWords);
+    if (!wcstr  ||  n < count) {
+
+        /* Zero-terminate output buffer */
+        if (wcstr  &&  sizeInWords) {
+            if (n >= sizeInWords) {
+                n = sizeInWords - 1;
+            }
+            wcstr[n] = 0;
+        }
+
+        /* Length of resulting multi-byte string WITH zero terminator */
+        if (pReturnValue) {
+            *pReturnValue = n + 1;
+        }
+
+        /* Success */
+        error = 0;
+
+    } else {
+
+        /* Could not convert string */
+        error = 1;
+
+    }
+
+#endif
+    return error;
+}
+
+/* Convert wide-character string to multi-byte string */
+static int
+dirent_wcstombs_s(
+    size_t *pReturnValue,
+    char *mbstr,
+    size_t sizeInBytes, /* max size of mbstr */
+    const wchar_t *wcstr,
+    size_t count)
+{
+    int error;
+
+#if defined(_MSC_VER)  &&  _MSC_VER >= 1400
+
+    /* Microsoft Visual Studio 2005 or later */
+    error = wcstombs_s (pReturnValue, mbstr, sizeInBytes, wcstr, count);
+
+#else
+
+    /* Older Visual Studio or non-Microsoft compiler */
+    size_t n;
+
+    /* Convert to multi-byte string (or count the number of bytes needed) */
+    n = wcstombs (mbstr, wcstr, sizeInBytes);
+    if (!mbstr  ||  n < count) {
+
+        /* Zero-terminate output buffer */
+        if (mbstr  &&  sizeInBytes) {
+            if (n >= sizeInBytes) {
+                n = sizeInBytes - 1;
+            }
+            mbstr[n] = '\0';
+        }
+
+        /* Length of resulting multi-bytes string WITH zero-terminator */
+        if (pReturnValue) {
+            *pReturnValue = n + 1;
+        }
+
+        /* Success */
+        error = 0;
+
+    } else {
+
+        /* Cannot convert string */
+        error = 1;
+
+    }
+
+#endif
+    return error;
+}
+
+/* Set errno variable */
+static void
+dirent_set_errno(
+    int error)
+{
+#if defined(_MSC_VER)  &&  _MSC_VER >= 1400
+
+    /* Microsoft Visual Studio 2005 and later */
+    _set_errno (error);
+
+#else
+
+    /* Non-Microsoft compiler or older Microsoft compiler */
+    errno = error;
+
+#endif
+}
+
+
+#ifdef __cplusplus
+}
+#endif
+#endif /*DIRENT_H*/
diff --git a/src/windows/glog/log_severity.h b/src/windows/glog/log_severity.h
new file mode 100644
index 000000000000..22a4191ab8bb
--- /dev/null
+++ b/src/windows/glog/log_severity.h
@@ -0,0 +1,96 @@
+// This file is automatically generated from src/glog/log_severity.h
+// using src/windows/preprocess.sh.
+// DO NOT EDIT!
+
+// Copyright (c) 2007, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef BASE_LOG_SEVERITY_H__
+#define BASE_LOG_SEVERITY_H__
+
+// Annoying stuff for windows -- makes sure clients can import these functions
+#ifndef GOOGLE_GLOG_DLL_DECL
+# if defined(_WIN32) && !defined(__CYGWIN__)
+#   define GOOGLE_GLOG_DLL_DECL  __declspec(dllimport)
+# else
+#   define GOOGLE_GLOG_DLL_DECL
+# endif
+#endif
+
+// Variables of type LogSeverity are widely taken to lie in the range
+// [0, NUM_SEVERITIES-1].  Be careful to preserve this assumption if
+// you ever need to change their values or add a new severity.
+typedef int LogSeverity;
+
+const int GLOG_INFO = 0, GLOG_WARNING = 1, GLOG_ERROR = 2, GLOG_FATAL = 3,
+  NUM_SEVERITIES = 4;
+#ifndef GLOG_NO_ABBREVIATED_SEVERITIES
+# ifdef ERROR
+#  error ERROR macro is defined. Define GLOG_NO_ABBREVIATED_SEVERITIES before including logging.h. See the document for detail.
+# endif
+const int INFO = GLOG_INFO, WARNING = GLOG_WARNING,
+  ERROR = GLOG_ERROR, FATAL = GLOG_FATAL;
+#endif
+
+// DFATAL is FATAL in debug mode, ERROR in normal mode
+#ifdef NDEBUG
+#define DFATAL_LEVEL ERROR
+#else
+#define DFATAL_LEVEL FATAL
+#endif
+
+extern GOOGLE_GLOG_DLL_DECL const char* const LogSeverityNames[NUM_SEVERITIES];
+
+// NDEBUG usage helpers related to (RAW_)DCHECK:
+//
+// DEBUG_MODE is for small !NDEBUG uses like
+//   if (DEBUG_MODE) foo.CheckThatFoo();
+// instead of substantially more verbose
+//   #ifndef NDEBUG
+//     foo.CheckThatFoo();
+//   #endif
+//
+// IF_DEBUG_MODE is for small !NDEBUG uses like
+//   IF_DEBUG_MODE( string error; )
+//   DCHECK(Foo(&error)) << error;
+// instead of substantially more verbose
+//   #ifndef NDEBUG
+//     string error;
+//     DCHECK(Foo(&error)) << error;
+//   #endif
+//
+#ifdef NDEBUG
+enum { DEBUG_MODE = 0 };
+#define IF_DEBUG_MODE(x)
+#else
+enum { DEBUG_MODE = 1 };
+#define IF_DEBUG_MODE(x) x
+#endif
+
+#endif  // BASE_LOG_SEVERITY_H__
diff --git a/src/windows/glog/logging.h b/src/windows/glog/logging.h
new file mode 100755
index 000000000000..e111bf07c46c
--- /dev/null
+++ b/src/windows/glog/logging.h
@@ -0,0 +1,1690 @@
+// This file is automatically generated from src/glog/logging.h.in
+// using src/windows/preprocess.sh.
+// DO NOT EDIT!
+
+// Copyright (c) 1999, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Author: Ray Sidney
+//
+// This file contains #include information about logging-related stuff.
+// Pretty much everybody needs to #include this file so that they can
+// log various happenings.
+//
+#ifndef _LOGGING_H_
+#define _LOGGING_H_
+
+#include <errno.h>
+#include <string.h>
+#include <time.h>
+#include <iosfwd>
+#include <ostream>
+#include <sstream>
+#include <string>
+#if 0
+# include <unistd.h>
+#endif
+#include <vector>
+
+#if defined(_MSC_VER)
+#define GLOG_MSVC_PUSH_DISABLE_WARNING(n) __pragma(warning(push)) \
+                                     __pragma(warning(disable:n))
+#define GLOG_MSVC_POP_WARNING() __pragma(warning(pop))
+#else
+#define GLOG_MSVC_PUSH_DISABLE_WARNING(n)
+#define GLOG_MSVC_POP_WARNING()
+#endif
+
+// Annoying stuff for windows -- makes sure clients can import these functions
+#ifndef GOOGLE_GLOG_DLL_DECL
+# if defined(_WIN32) && !defined(__CYGWIN__)
+#   define GOOGLE_GLOG_DLL_DECL  __declspec(dllimport)
+# else
+#   define GOOGLE_GLOG_DLL_DECL
+# endif
+#endif
+
+// We care a lot about number of bits things take up.  Unfortunately,
+// systems define their bit-specific ints in a lot of different ways.
+// We use our own way, and have a typedef to get there.
+// Note: these commands below may look like "#if 1" or "#if 0", but
+// that's because they were constructed that way at ./configure time.
+// Look at logging.h.in to see how they're calculated (based on your config).
+#if 0
+#include <stdint.h>             // the normal place uint16_t is defined
+#endif
+#if 0
+#include <sys/types.h>          // the normal place u_int16_t is defined
+#endif
+#if 0
+#include <inttypes.h>           // a third place for uint16_t or u_int16_t
+#endif
+
+#if 0
+#include <gflags/gflags.h>
+#endif
+
+namespace google {
+
+#if 0      // the C99 format
+typedef int32_t int32;
+typedef uint32_t uint32;
+typedef int64_t int64;
+typedef uint64_t uint64;
+#elif 0   // the BSD format
+typedef int32_t int32;
+typedef u_int32_t uint32;
+typedef int64_t int64;
+typedef u_int64_t uint64;
+#elif 1    // the windows (vc7) format
+typedef __int32 int32;
+typedef unsigned __int32 uint32;
+typedef __int64 int64;
+typedef unsigned __int64 uint64;
+#else
+#error Do not know how to define a 32-bit integer quantity on your system
+#endif
+
+}
+
+// The global value of GOOGLE_STRIP_LOG. All the messages logged to
+// LOG(XXX) with severity less than GOOGLE_STRIP_LOG will not be displayed.
+// If it can be determined at compile time that the message will not be
+// printed, the statement will be compiled out.
+//
+// Example: to strip out all INFO and WARNING messages, use the value
+// of 2 below. To make an exception for WARNING messages from a single
+// file, add "#define GOOGLE_STRIP_LOG 1" to that file _before_ including
+// base/logging.h
+#ifndef GOOGLE_STRIP_LOG
+#define GOOGLE_STRIP_LOG 0
+#endif
+
+// GCC can be told that a certain branch is not likely to be taken (for
+// instance, a CHECK failure), and use that information in static analysis.
+// Giving it this information can help it optimize for the common case in
+// the absence of better information (ie. -fprofile-arcs).
+//
+#ifndef GOOGLE_PREDICT_BRANCH_NOT_TAKEN
+#if 0
+#define GOOGLE_PREDICT_BRANCH_NOT_TAKEN(x) (__builtin_expect(x, 0))
+#else
+#define GOOGLE_PREDICT_BRANCH_NOT_TAKEN(x) x
+#endif
+#endif
+
+#ifndef GOOGLE_PREDICT_FALSE
+#if 0
+#define GOOGLE_PREDICT_FALSE(x) (__builtin_expect(x, 0))
+#else
+#define GOOGLE_PREDICT_FALSE(x) x
+#endif
+#endif
+
+#ifndef GOOGLE_PREDICT_TRUE
+#if 0
+#define GOOGLE_PREDICT_TRUE(x) (__builtin_expect(!!(x), 1))
+#else
+#define GOOGLE_PREDICT_TRUE(x) x
+#endif
+#endif
+
+
+// Make a bunch of macros for logging.  The way to log things is to stream
+// things to LOG(<a particular severity level>).  E.g.,
+//
+//   LOG(INFO) << "Found " << num_cookies << " cookies";
+//
+// You can capture log messages in a string, rather than reporting them
+// immediately:
+//
+//   vector<string> errors;
+//   LOG_STRING(ERROR, &errors) << "Couldn't parse cookie #" << cookie_num;
+//
+// This pushes back the new error onto 'errors'; if given a NULL pointer,
+// it reports the error via LOG(ERROR).
+//
+// You can also do conditional logging:
+//
+//   LOG_IF(INFO, num_cookies > 10) << "Got lots of cookies";
+//
+// You can also do occasional logging (log every n'th occurrence of an
+// event):
+//
+//   LOG_EVERY_N(INFO, 10) << "Got the " << google::COUNTER << "th cookie";
+//
+// The above will cause log messages to be output on the 1st, 11th, 21st, ...
+// times it is executed.  Note that the special google::COUNTER value is used
+// to identify which repetition is happening.
+//
+// You can also do occasional conditional logging (log every n'th
+// occurrence of an event, when condition is satisfied):
+//
+//   LOG_IF_EVERY_N(INFO, (size > 1024), 10) << "Got the " << google::COUNTER
+//                                           << "th big cookie";
+//
+// You can log messages the first N times your code executes a line. E.g.
+//
+//   LOG_FIRST_N(INFO, 20) << "Got the " << google::COUNTER << "th cookie";
+//
+// Outputs log messages for the first 20 times it is executed.
+//
+// Analogous SYSLOG, SYSLOG_IF, and SYSLOG_EVERY_N macros are available.
+// These log to syslog as well as to the normal logs.  If you use these at
+// all, you need to be aware that syslog can drastically reduce performance,
+// especially if it is configured for remote logging!  Don't use these
+// unless you fully understand this and have a concrete need to use them.
+// Even then, try to minimize your use of them.
+//
+// There are also "debug mode" logging macros like the ones above:
+//
+//   DLOG(INFO) << "Found cookies";
+//
+//   DLOG_IF(INFO, num_cookies > 10) << "Got lots of cookies";
+//
+//   DLOG_EVERY_N(INFO, 10) << "Got the " << google::COUNTER << "th cookie";
+//
+// All "debug mode" logging is compiled away to nothing for non-debug mode
+// compiles.
+//
+// We also have
+//
+//   LOG_ASSERT(assertion);
+//   DLOG_ASSERT(assertion);
+//
+// which is syntactic sugar for {,D}LOG_IF(FATAL, assert fails) << assertion;
+//
+// There are "verbose level" logging macros.  They look like
+//
+//   VLOG(1) << "I'm printed when you run the program with --v=1 or more";
+//   VLOG(2) << "I'm printed when you run the program with --v=2 or more";
+//
+// These always log at the INFO log level (when they log at all).
+// The verbose logging can also be turned on module-by-module.  For instance,
+//    --vmodule=mapreduce=2,file=1,gfs*=3 --v=0
+// will cause:
+//   a. VLOG(2) and lower messages to be printed from mapreduce.{h,cc}
+//   b. VLOG(1) and lower messages to be printed from file.{h,cc}
+//   c. VLOG(3) and lower messages to be printed from files prefixed with "gfs"
+//   d. VLOG(0) and lower messages to be printed from elsewhere
+//
+// The wildcarding functionality shown by (c) supports both '*' (match
+// 0 or more characters) and '?' (match any single character) wildcards.
+//
+// There's also VLOG_IS_ON(n) "verbose level" condition macro. To be used as
+//
+//   if (VLOG_IS_ON(2)) {
+//     // do some logging preparation and logging
+//     // that can't be accomplished with just VLOG(2) << ...;
+//   }
+//
+// There are also VLOG_IF, VLOG_EVERY_N and VLOG_IF_EVERY_N "verbose level"
+// condition macros for sample cases, when some extra computation and
+// preparation for logs is not needed.
+//   VLOG_IF(1, (size > 1024))
+//      << "I'm printed when size is more than 1024 and when you run the "
+//         "program with --v=1 or more";
+//   VLOG_EVERY_N(1, 10)
+//      << "I'm printed every 10th occurrence, and when you run the program "
+//         "with --v=1 or more. Present occurence is " << google::COUNTER;
+//   VLOG_IF_EVERY_N(1, (size > 1024), 10)
+//      << "I'm printed on every 10th occurence of case when size is more "
+//         " than 1024, when you run the program with --v=1 or more. ";
+//         "Present occurence is " << google::COUNTER;
+//
+// The supported severity levels for macros that allow you to specify one
+// are (in increasing order of severity) INFO, WARNING, ERROR, and FATAL.
+// Note that messages of a given severity are logged not only in the
+// logfile for that severity, but also in all logfiles of lower severity.
+// E.g., a message of severity FATAL will be logged to the logfiles of
+// severity FATAL, ERROR, WARNING, and INFO.
+//
+// There is also the special severity of DFATAL, which logs FATAL in
+// debug mode, ERROR in normal mode.
+//
+// Very important: logging a message at the FATAL severity level causes
+// the program to terminate (after the message is logged).
+//
+// Unless otherwise specified, logs will be written to the filename
+// "<program name>.<hostname>.<user name>.log.<severity level>.", followed
+// by the date, time, and pid (you can't prevent the date, time, and pid
+// from being in the filename).
+//
+// The logging code takes two flags:
+//     --v=#           set the verbose level
+//     --logtostderr   log all the messages to stderr instead of to logfiles
+
+// LOG LINE PREFIX FORMAT
+//
+// Log lines have this form:
+//
+//     Lyyyymmdd hh:mm:ss.uuuuuu threadid file:line] msg...
+//
+// where the fields are defined as follows:
+//
+//   L                A single character, representing the log level
+//                    (eg 'I' for INFO)
+//   yyyy             The year
+//   mm               The month (zero padded; ie May is '05')
+//   dd               The day (zero padded)
+//   hh:mm:ss.uuuuuu  Time in hours, minutes and fractional seconds
+//   threadid         The space-padded thread ID as returned by GetTID()
+//                    (this matches the PID on Linux)
+//   file             The file name
+//   line             The line number
+//   msg              The user-supplied message
+//
+// Example:
+//
+//   I1103 11:57:31.739339 24395 google.cc:2341] Command line: ./some_prog
+//   I1103 11:57:31.739403 24395 google.cc:2342] Process id 24395
+//
+// NOTE: although the microseconds are useful for comparing events on
+// a single machine, clocks on different machines may not be well
+// synchronized.  Hence, use caution when comparing the low bits of
+// timestamps from different machines.
+
+#ifndef DECLARE_VARIABLE
+#define MUST_UNDEF_GFLAGS_DECLARE_MACROS
+#define DECLARE_VARIABLE(type, shorttype, name, tn)                     \
+  namespace fL##shorttype {                                             \
+    extern GOOGLE_GLOG_DLL_DECL type FLAGS_##name;                      \
+  }                                                                     \
+  using fL##shorttype::FLAGS_##name
+
+// bool specialization
+#define DECLARE_bool(name) \
+  DECLARE_VARIABLE(bool, B, name, bool)
+
+// int32 specialization
+#define DECLARE_int32(name) \
+  DECLARE_VARIABLE(google::int32, I, name, int32)
+
+// Special case for string, because we have to specify the namespace
+// std::string, which doesn't play nicely with our FLAG__namespace hackery.
+#define DECLARE_string(name)                                            \
+  namespace fLS {                                                       \
+    extern GOOGLE_GLOG_DLL_DECL std::string& FLAGS_##name;              \
+  }                                                                     \
+  using fLS::FLAGS_##name
+#endif
+
+// Set whether log messages go to stderr instead of logfiles
+DECLARE_bool(logtostderr);
+
+// Set whether log messages go to stderr in addition to logfiles.
+DECLARE_bool(alsologtostderr);
+
+// Set color messages logged to stderr (if supported by terminal).
+DECLARE_bool(colorlogtostderr);
+
+// Log messages at a level >= this flag are automatically sent to
+// stderr in addition to log files.
+DECLARE_int32(stderrthreshold);
+
+// Set whether the log prefix should be prepended to each line of output.
+DECLARE_bool(log_prefix);
+
+// Log messages at a level <= this flag are buffered.
+// Log messages at a higher level are flushed immediately.
+DECLARE_int32(logbuflevel);
+
+// Sets the maximum number of seconds which logs may be buffered for.
+DECLARE_int32(logbufsecs);
+
+// Log suppression level: messages logged at a lower level than this
+// are suppressed.
+DECLARE_int32(minloglevel);
+
+// If specified, logfiles are written into this directory instead of the
+// default logging directory.
+DECLARE_string(log_dir);
+
+// Set the log file mode.
+DECLARE_int32(logfile_mode);
+
+// Sets the path of the directory into which to put additional links
+// to the log files.
+DECLARE_string(log_link);
+
+DECLARE_int32(v);  // in vlog_is_on.cc
+
+// Sets the maximum log file size (in MB).
+DECLARE_int32(max_log_size);
+
+// Sets whether to avoid logging to the disk if the disk is full.
+DECLARE_bool(stop_logging_if_full_disk);
+
+#ifdef MUST_UNDEF_GFLAGS_DECLARE_MACROS
+#undef MUST_UNDEF_GFLAGS_DECLARE_MACROS
+#undef DECLARE_VARIABLE
+#undef DECLARE_bool
+#undef DECLARE_int32
+#undef DECLARE_string
+#endif
+
+// Log messages below the GOOGLE_STRIP_LOG level will be compiled away for
+// security reasons. See LOG(severtiy) below.
+
+// A few definitions of macros that don't generate much code.  Since
+// LOG(INFO) and its ilk are used all over our code, it's
+// better to have compact code for these operations.
+
+#if GOOGLE_STRIP_LOG == 0
+#define COMPACT_GOOGLE_LOG_INFO google::LogMessage( \
+      __FILE__, __LINE__)
+#define LOG_TO_STRING_INFO(message) google::LogMessage( \
+      __FILE__, __LINE__, google::GLOG_INFO, message)
+#else
+#define COMPACT_GOOGLE_LOG_INFO google::NullStream()
+#define LOG_TO_STRING_INFO(message) google::NullStream()
+#endif
+
+#if GOOGLE_STRIP_LOG <= 1
+#define COMPACT_GOOGLE_LOG_WARNING google::LogMessage( \
+      __FILE__, __LINE__, google::GLOG_WARNING)
+#define LOG_TO_STRING_WARNING(message) google::LogMessage( \
+      __FILE__, __LINE__, google::GLOG_WARNING, message)
+#else
+#define COMPACT_GOOGLE_LOG_WARNING google::NullStream()
+#define LOG_TO_STRING_WARNING(message) google::NullStream()
+#endif
+
+#if GOOGLE_STRIP_LOG <= 2
+#define COMPACT_GOOGLE_LOG_ERROR google::LogMessage( \
+      __FILE__, __LINE__, google::GLOG_ERROR)
+#define LOG_TO_STRING_ERROR(message) google::LogMessage( \
+      __FILE__, __LINE__, google::GLOG_ERROR, message)
+#else
+#define COMPACT_GOOGLE_LOG_ERROR google::NullStream()
+#define LOG_TO_STRING_ERROR(message) google::NullStream()
+#endif
+
+#if GOOGLE_STRIP_LOG <= 3
+#define COMPACT_GOOGLE_LOG_FATAL google::LogMessageFatal( \
+      __FILE__, __LINE__)
+#define LOG_TO_STRING_FATAL(message) google::LogMessage( \
+      __FILE__, __LINE__, google::GLOG_FATAL, message)
+#else
+#define COMPACT_GOOGLE_LOG_FATAL google::NullStreamFatal()
+#define LOG_TO_STRING_FATAL(message) google::NullStreamFatal()
+#endif
+
+#if defined(NDEBUG) && !defined(DCHECK_ALWAYS_ON)
+#define DCHECK_IS_ON() 0
+#else
+#define DCHECK_IS_ON() 1
+#endif
+
+// For DFATAL, we want to use LogMessage (as opposed to
+// LogMessageFatal), to be consistent with the original behavior.
+#if !DCHECK_IS_ON()
+#define COMPACT_GOOGLE_LOG_DFATAL COMPACT_GOOGLE_LOG_ERROR
+#elif GOOGLE_STRIP_LOG <= 3
+#define COMPACT_GOOGLE_LOG_DFATAL google::LogMessage( \
+      __FILE__, __LINE__, google::GLOG_FATAL)
+#else
+#define COMPACT_GOOGLE_LOG_DFATAL google::NullStreamFatal()
+#endif
+
+#define GOOGLE_LOG_INFO(counter) google::LogMessage(__FILE__, __LINE__, google::GLOG_INFO, counter, &google::LogMessage::SendToLog)
+#define SYSLOG_INFO(counter) \
+  google::LogMessage(__FILE__, __LINE__, google::GLOG_INFO, counter, \
+  &google::LogMessage::SendToSyslogAndLog)
+#define GOOGLE_LOG_WARNING(counter)  \
+  google::LogMessage(__FILE__, __LINE__, google::GLOG_WARNING, counter, \
+  &google::LogMessage::SendToLog)
+#define SYSLOG_WARNING(counter)  \
+  google::LogMessage(__FILE__, __LINE__, google::GLOG_WARNING, counter, \
+  &google::LogMessage::SendToSyslogAndLog)
+#define GOOGLE_LOG_ERROR(counter)  \
+  google::LogMessage(__FILE__, __LINE__, google::GLOG_ERROR, counter, \
+  &google::LogMessage::SendToLog)
+#define SYSLOG_ERROR(counter)  \
+  google::LogMessage(__FILE__, __LINE__, google::GLOG_ERROR, counter, \
+  &google::LogMessage::SendToSyslogAndLog)
+#define GOOGLE_LOG_FATAL(counter) \
+  google::LogMessage(__FILE__, __LINE__, google::GLOG_FATAL, counter, \
+  &google::LogMessage::SendToLog)
+#define SYSLOG_FATAL(counter) \
+  google::LogMessage(__FILE__, __LINE__, google::GLOG_FATAL, counter, \
+  &google::LogMessage::SendToSyslogAndLog)
+#define GOOGLE_LOG_DFATAL(counter) \
+  google::LogMessage(__FILE__, __LINE__, google::DFATAL_LEVEL, counter, \
+  &google::LogMessage::SendToLog)
+#define SYSLOG_DFATAL(counter) \
+  google::LogMessage(__FILE__, __LINE__, google::DFATAL_LEVEL, counter, \
+  &google::LogMessage::SendToSyslogAndLog)
+
+#if defined(WIN32) || defined(_WIN32) || defined(__WIN32__) || defined(__CYGWIN__) || defined(__CYGWIN32__)
+// A very useful logging macro to log windows errors:
+#define LOG_SYSRESULT(result) \
+  if (FAILED(HRESULT_FROM_WIN32(result))) { \
+    LPSTR message = NULL; \
+    LPSTR msg = reinterpret_cast<LPSTR>(&message); \
+    DWORD message_length = FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER | \
+                         FORMAT_MESSAGE_FROM_SYSTEM, \
+                         0, result, 0, msg, 100, NULL); \
+    if (message_length > 0) { \
+      google::LogMessage(__FILE__, __LINE__, google::GLOG_ERROR, 0, \
+          &google::LogMessage::SendToLog).stream() \
+          << reinterpret_cast<const char*>(message); \
+      LocalFree(message); \
+    } \
+  }
+#endif
+
+// We use the preprocessor's merging operator, "##", so that, e.g.,
+// LOG(INFO) becomes the token GOOGLE_LOG_INFO.  There's some funny
+// subtle difference between ostream member streaming functions (e.g.,
+// ostream::operator<<(int) and ostream non-member streaming functions
+// (e.g., ::operator<<(ostream&, string&): it turns out that it's
+// impossible to stream something like a string directly to an unnamed
+// ostream. We employ a neat hack by calling the stream() member
+// function of LogMessage which seems to avoid the problem.
+#define LOG(severity) COMPACT_GOOGLE_LOG_ ## severity.stream()
+#define SYSLOG(severity) SYSLOG_ ## severity(0).stream()
+
+namespace google {
+
+// They need the definitions of integer types.
+#include "glog/log_severity.h"
+#include "glog/vlog_is_on.h"
+
+// Initialize google's logging library. You will see the program name
+// specified by argv0 in log outputs.
+GOOGLE_GLOG_DLL_DECL void InitGoogleLogging(const char* argv0);
+
+// Shutdown google's logging library.
+GOOGLE_GLOG_DLL_DECL void ShutdownGoogleLogging();
+
+// Install a function which will be called after LOG(FATAL).
+GOOGLE_GLOG_DLL_DECL void InstallFailureFunction(void (*fail_func)());
+
+// Enable/Disable old log cleaner.
+GOOGLE_GLOG_DLL_DECL void EnableLogCleaner(int overdue_days);
+GOOGLE_GLOG_DLL_DECL void DisableLogCleaner();
+
+
+class LogSink;  // defined below
+
+// If a non-NULL sink pointer is given, we push this message to that sink.
+// For LOG_TO_SINK we then do normal LOG(severity) logging as well.
+// This is useful for capturing messages and passing/storing them
+// somewhere more specific than the global log of the process.
+// Argument types:
+//   LogSink* sink;
+//   LogSeverity severity;
+// The cast is to disambiguate NULL arguments.
+#define LOG_TO_SINK(sink, severity) \
+  google::LogMessage(                                    \
+      __FILE__, __LINE__,                                               \
+      google::GLOG_ ## severity,                         \
+      static_cast<google::LogSink*>(sink), true).stream()
+#define LOG_TO_SINK_BUT_NOT_TO_LOGFILE(sink, severity)                  \
+  google::LogMessage(                                    \
+      __FILE__, __LINE__,                                               \
+      google::GLOG_ ## severity,                         \
+      static_cast<google::LogSink*>(sink), false).stream()
+
+// If a non-NULL string pointer is given, we write this message to that string.
+// We then do normal LOG(severity) logging as well.
+// This is useful for capturing messages and storing them somewhere more
+// specific than the global log of the process.
+// Argument types:
+//   string* message;
+//   LogSeverity severity;
+// The cast is to disambiguate NULL arguments.
+// NOTE: LOG(severity) expands to LogMessage().stream() for the specified
+// severity.
+#define LOG_TO_STRING(severity, message) \
+  LOG_TO_STRING_##severity(static_cast<string*>(message)).stream()
+
+// If a non-NULL pointer is given, we push the message onto the end
+// of a vector of strings; otherwise, we report it with LOG(severity).
+// This is handy for capturing messages and perhaps passing them back
+// to the caller, rather than reporting them immediately.
+// Argument types:
+//   LogSeverity severity;
+//   vector<string> *outvec;
+// The cast is to disambiguate NULL arguments.
+#define LOG_STRING(severity, outvec) \
+  LOG_TO_STRING_##severity(static_cast<std::vector<std::string>*>(outvec)).stream()
+
+#define LOG_IF(severity, condition) \
+  static_cast<void>(0),             \
+  !(condition) ? (void) 0 : google::LogMessageVoidify() & LOG(severity)
+#define SYSLOG_IF(severity, condition) \
+  static_cast<void>(0),                \
+  !(condition) ? (void) 0 : google::LogMessageVoidify() & SYSLOG(severity)
+
+#define LOG_ASSERT(condition)  \
+  LOG_IF(FATAL, !(condition)) << "Assert failed: " #condition
+#define SYSLOG_ASSERT(condition) \
+  SYSLOG_IF(FATAL, !(condition)) << "Assert failed: " #condition
+
+// CHECK dies with a fatal error if condition is not true.  It is *not*
+// controlled by DCHECK_IS_ON(), so the check will be executed regardless of
+// compilation mode.  Therefore, it is safe to do things like:
+//    CHECK(fp->Write(x) == 4)
+#define CHECK(condition)  \
+      LOG_IF(FATAL, GOOGLE_PREDICT_BRANCH_NOT_TAKEN(!(condition))) \
+             << "Check failed: " #condition " "
+
+// A container for a string pointer which can be evaluated to a bool -
+// true iff the pointer is NULL.
+struct CheckOpString {
+  CheckOpString(std::string* str) : str_(str) { }
+  // No destructor: if str_ is non-NULL, we're about to LOG(FATAL),
+  // so there's no point in cleaning up str_.
+  operator bool() const {
+    return GOOGLE_PREDICT_BRANCH_NOT_TAKEN(str_ != NULL);
+  }
+  std::string* str_;
+};
+
+// Function is overloaded for integral types to allow static const
+// integrals declared in classes and not defined to be used as arguments to
+// CHECK* macros. It's not encouraged though.
+template <class T>
+inline const T&       GetReferenceableValue(const T&           t) { return t; }
+inline char           GetReferenceableValue(char               t) { return t; }
+inline unsigned char  GetReferenceableValue(unsigned char      t) { return t; }
+inline signed char    GetReferenceableValue(signed char        t) { return t; }
+inline short          GetReferenceableValue(short              t) { return t; }
+inline unsigned short GetReferenceableValue(unsigned short     t) { return t; }
+inline int            GetReferenceableValue(int                t) { return t; }
+inline unsigned int   GetReferenceableValue(unsigned int       t) { return t; }
+inline long           GetReferenceableValue(long               t) { return t; }
+inline unsigned long  GetReferenceableValue(unsigned long      t) { return t; }
+inline long long      GetReferenceableValue(long long          t) { return t; }
+inline unsigned long long GetReferenceableValue(unsigned long long t) {
+  return t;
+}
+
+// This is a dummy class to define the following operator.
+struct DummyClassToDefineOperator {};
+
+}
+
+// Define global operator<< to declare using ::operator<<.
+// This declaration will allow use to use CHECK macros for user
+// defined classes which have operator<< (e.g., stl_logging.h).
+inline std::ostream& operator<<(
+    std::ostream& out, const google::DummyClassToDefineOperator&) {
+  return out;
+}
+
+namespace google {
+
+// This formats a value for a failing CHECK_XX statement.  Ordinarily,
+// it uses the definition for operator<<, with a few special cases below.
+template <typename T>
+inline void MakeCheckOpValueString(std::ostream* os, const T& v) {
+  (*os) << v;
+}
+
+// Overrides for char types provide readable values for unprintable
+// characters.
+template <> GOOGLE_GLOG_DLL_DECL
+void MakeCheckOpValueString(std::ostream* os, const char& v);
+template <> GOOGLE_GLOG_DLL_DECL
+void MakeCheckOpValueString(std::ostream* os, const signed char& v);
+template <> GOOGLE_GLOG_DLL_DECL
+void MakeCheckOpValueString(std::ostream* os, const unsigned char& v);
+
+// Build the error message string. Specify no inlining for code size.
+template <typename T1, typename T2>
+std::string* MakeCheckOpString(const T1& v1, const T2& v2, const char* exprtext)
+    ;
+
+namespace base {
+namespace internal {
+
+// If "s" is less than base_logging::INFO, returns base_logging::INFO.
+// If "s" is greater than base_logging::FATAL, returns
+// base_logging::ERROR.  Otherwise, returns "s".
+LogSeverity NormalizeSeverity(LogSeverity s);
+
+}  // namespace internal
+
+// A helper class for formatting "expr (V1 vs. V2)" in a CHECK_XX
+// statement.  See MakeCheckOpString for sample usage.  Other
+// approaches were considered: use of a template method (e.g.,
+// base::BuildCheckOpString(exprtext, base::Print<T1>, &v1,
+// base::Print<T2>, &v2), however this approach has complications
+// related to volatile arguments and function-pointer arguments).
+class GOOGLE_GLOG_DLL_DECL CheckOpMessageBuilder {
+ public:
+  // Inserts "exprtext" and " (" to the stream.
+  explicit CheckOpMessageBuilder(const char *exprtext);
+  // Deletes "stream_".
+  ~CheckOpMessageBuilder();
+  // For inserting the first variable.
+  std::ostream* ForVar1() { return stream_; }
+  // For inserting the second variable (adds an intermediate " vs. ").
+  std::ostream* ForVar2();
+  // Get the result (inserts the closing ")").
+  std::string* NewString();
+
+ private:
+  std::ostringstream *stream_;
+};
+
+}  // namespace base
+
+template <typename T1, typename T2>
+std::string* MakeCheckOpString(const T1& v1, const T2& v2, const char* exprtext) {
+  base::CheckOpMessageBuilder comb(exprtext);
+  MakeCheckOpValueString(comb.ForVar1(), v1);
+  MakeCheckOpValueString(comb.ForVar2(), v2);
+  return comb.NewString();
+}
+
+// Helper functions for CHECK_OP macro.
+// The (int, int) specialization works around the issue that the compiler
+// will not instantiate the template version of the function on values of
+// unnamed enum type - see comment below.
+#define DEFINE_CHECK_OP_IMPL(name, op) \
+  template <typename T1, typename T2> \
+  inline std::string* name##Impl(const T1& v1, const T2& v2,    \
+                            const char* exprtext) { \
+    if (GOOGLE_PREDICT_TRUE(v1 op v2)) return NULL; \
+    else return MakeCheckOpString(v1, v2, exprtext); \
+  } \
+  inline std::string* name##Impl(int v1, int v2, const char* exprtext) { \
+    return name##Impl<int, int>(v1, v2, exprtext); \
+  }
+
+// We use the full name Check_EQ, Check_NE, etc. in case the file including
+// base/logging.h provides its own #defines for the simpler names EQ, NE, etc.
+// This happens if, for example, those are used as token names in a
+// yacc grammar.
+DEFINE_CHECK_OP_IMPL(Check_EQ, ==)  // Compilation error with CHECK_EQ(NULL, x)?
+DEFINE_CHECK_OP_IMPL(Check_NE, !=)  // Use CHECK(x == NULL) instead.
+DEFINE_CHECK_OP_IMPL(Check_LE, <=)
+DEFINE_CHECK_OP_IMPL(Check_LT, < )
+DEFINE_CHECK_OP_IMPL(Check_GE, >=)
+DEFINE_CHECK_OP_IMPL(Check_GT, > )
+#undef DEFINE_CHECK_OP_IMPL
+
+// Helper macro for binary operators.
+// Don't use this macro directly in your code, use CHECK_EQ et al below.
+
+#if defined(STATIC_ANALYSIS)
+// Only for static analysis tool to know that it is equivalent to assert
+#define CHECK_OP_LOG(name, op, val1, val2, log) CHECK((val1) op (val2))
+#elif DCHECK_IS_ON()
+// In debug mode, avoid constructing CheckOpStrings if possible,
+// to reduce the overhead of CHECK statments by 2x.
+// Real DCHECK-heavy tests have seen 1.5x speedups.
+
+// The meaning of "string" might be different between now and
+// when this macro gets invoked (e.g., if someone is experimenting
+// with other string implementations that get defined after this
+// file is included).  Save the current meaning now and use it
+// in the macro.
+typedef std::string _Check_string;
+#define CHECK_OP_LOG(name, op, val1, val2, log)                         \
+  while (google::_Check_string* _result =                \
+         google::Check##name##Impl(                      \
+             google::GetReferenceableValue(val1),        \
+             google::GetReferenceableValue(val2),        \
+             #val1 " " #op " " #val2))                                  \
+    log(__FILE__, __LINE__,                                             \
+        google::CheckOpString(_result)).stream()
+#else
+// In optimized mode, use CheckOpString to hint to compiler that
+// the while condition is unlikely.
+#define CHECK_OP_LOG(name, op, val1, val2, log)                         \
+  while (google::CheckOpString _result =                 \
+         google::Check##name##Impl(                      \
+             google::GetReferenceableValue(val1),        \
+             google::GetReferenceableValue(val2),        \
+             #val1 " " #op " " #val2))                                  \
+    log(__FILE__, __LINE__, _result).stream()
+#endif  // STATIC_ANALYSIS, DCHECK_IS_ON()
+
+#if GOOGLE_STRIP_LOG <= 3
+#define CHECK_OP(name, op, val1, val2) \
+  CHECK_OP_LOG(name, op, val1, val2, google::LogMessageFatal)
+#else
+#define CHECK_OP(name, op, val1, val2) \
+  CHECK_OP_LOG(name, op, val1, val2, google::NullStreamFatal)
+#endif // STRIP_LOG <= 3
+
+// Equality/Inequality checks - compare two values, and log a FATAL message
+// including the two values when the result is not as expected.  The values
+// must have operator<<(ostream, ...) defined.
+//
+// You may append to the error message like so:
+//   CHECK_NE(1, 2) << ": The world must be ending!";
+//
+// We are very careful to ensure that each argument is evaluated exactly
+// once, and that anything which is legal to pass as a function argument is
+// legal here.  In particular, the arguments may be temporary expressions
+// which will end up being destroyed at the end of the apparent statement,
+// for example:
+//   CHECK_EQ(string("abc")[1], 'b');
+//
+// WARNING: These don't compile correctly if one of the arguments is a pointer
+// and the other is NULL. To work around this, simply static_cast NULL to the
+// type of the desired pointer.
+
+#define CHECK_EQ(val1, val2) CHECK_OP(_EQ, ==, val1, val2)
+#define CHECK_NE(val1, val2) CHECK_OP(_NE, !=, val1, val2)
+#define CHECK_LE(val1, val2) CHECK_OP(_LE, <=, val1, val2)
+#define CHECK_LT(val1, val2) CHECK_OP(_LT, < , val1, val2)
+#define CHECK_GE(val1, val2) CHECK_OP(_GE, >=, val1, val2)
+#define CHECK_GT(val1, val2) CHECK_OP(_GT, > , val1, val2)
+
+// Check that the input is non NULL.  This very useful in constructor
+// initializer lists.
+
+#define CHECK_NOTNULL(val) \
+  google::CheckNotNull(__FILE__, __LINE__, "'" #val "' Must be non NULL", (val))
+
+// Helper functions for string comparisons.
+// To avoid bloat, the definitions are in logging.cc.
+#define DECLARE_CHECK_STROP_IMPL(func, expected) \
+  GOOGLE_GLOG_DLL_DECL std::string* Check##func##expected##Impl( \
+      const char* s1, const char* s2, const char* names);
+DECLARE_CHECK_STROP_IMPL(strcmp, true)
+DECLARE_CHECK_STROP_IMPL(strcmp, false)
+DECLARE_CHECK_STROP_IMPL(strcasecmp, true)
+DECLARE_CHECK_STROP_IMPL(strcasecmp, false)
+#undef DECLARE_CHECK_STROP_IMPL
+
+// Helper macro for string comparisons.
+// Don't use this macro directly in your code, use CHECK_STREQ et al below.
+#define CHECK_STROP(func, op, expected, s1, s2) \
+  while (google::CheckOpString _result = \
+         google::Check##func##expected##Impl((s1), (s2), \
+                                     #s1 " " #op " " #s2)) \
+    LOG(FATAL) << *_result.str_
+
+
+// String (char*) equality/inequality checks.
+// CASE versions are case-insensitive.
+//
+// Note that "s1" and "s2" may be temporary strings which are destroyed
+// by the compiler at the end of the current "full expression"
+// (e.g. CHECK_STREQ(Foo().c_str(), Bar().c_str())).
+
+#define CHECK_STREQ(s1, s2) CHECK_STROP(strcmp, ==, true, s1, s2)
+#define CHECK_STRNE(s1, s2) CHECK_STROP(strcmp, !=, false, s1, s2)
+#define CHECK_STRCASEEQ(s1, s2) CHECK_STROP(strcasecmp, ==, true, s1, s2)
+#define CHECK_STRCASENE(s1, s2) CHECK_STROP(strcasecmp, !=, false, s1, s2)
+
+#define CHECK_INDEX(I,A) CHECK(I < (sizeof(A)/sizeof(A[0])))
+#define CHECK_BOUND(B,A) CHECK(B <= (sizeof(A)/sizeof(A[0])))
+
+#define CHECK_DOUBLE_EQ(val1, val2)              \
+  do {                                           \
+    CHECK_LE((val1), (val2)+0.000000000000001L); \
+    CHECK_GE((val1), (val2)-0.000000000000001L); \
+  } while (0)
+
+#define CHECK_NEAR(val1, val2, margin)           \
+  do {                                           \
+    CHECK_LE((val1), (val2)+(margin));           \
+    CHECK_GE((val1), (val2)-(margin));           \
+  } while (0)
+
+// perror()..googly style!
+//
+// PLOG() and PLOG_IF() and PCHECK() behave exactly like their LOG* and
+// CHECK equivalents with the addition that they postpend a description
+// of the current state of errno to their output lines.
+
+#define PLOG(severity) GOOGLE_PLOG(severity, 0).stream()
+
+#define GOOGLE_PLOG(severity, counter)  \
+  google::ErrnoLogMessage( \
+      __FILE__, __LINE__, google::GLOG_ ## severity, counter, \
+      &google::LogMessage::SendToLog)
+
+#define PLOG_IF(severity, condition) \
+  static_cast<void>(0),              \
+  !(condition) ? (void) 0 : google::LogMessageVoidify() & PLOG(severity)
+
+// A CHECK() macro that postpends errno if the condition is false. E.g.
+//
+// if (poll(fds, nfds, timeout) == -1) { PCHECK(errno == EINTR); ... }
+#define PCHECK(condition)  \
+      PLOG_IF(FATAL, GOOGLE_PREDICT_BRANCH_NOT_TAKEN(!(condition))) \
+              << "Check failed: " #condition " "
+
+// A CHECK() macro that lets you assert the success of a function that
+// returns -1 and sets errno in case of an error. E.g.
+//
+// CHECK_ERR(mkdir(path, 0700));
+//
+// or
+//
+// int fd = open(filename, flags); CHECK_ERR(fd) << ": open " << filename;
+#define CHECK_ERR(invocation)                                          \
+PLOG_IF(FATAL, GOOGLE_PREDICT_BRANCH_NOT_TAKEN((invocation) == -1))    \
+        << #invocation
+
+// Use macro expansion to create, for each use of LOG_EVERY_N(), static
+// variables with the __LINE__ expansion as part of the variable name.
+#define LOG_EVERY_N_VARNAME(base, line) LOG_EVERY_N_VARNAME_CONCAT(base, line)
+#define LOG_EVERY_N_VARNAME_CONCAT(base, line) base ## line
+
+#define LOG_OCCURRENCES LOG_EVERY_N_VARNAME(occurrences_, __LINE__)
+#define LOG_OCCURRENCES_MOD_N LOG_EVERY_N_VARNAME(occurrences_mod_n_, __LINE__)
+
+#define SOME_KIND_OF_LOG_EVERY_N(severity, n, what_to_do) \
+  static int LOG_OCCURRENCES = 0, LOG_OCCURRENCES_MOD_N = 0; \
+  ++LOG_OCCURRENCES; \
+  if (++LOG_OCCURRENCES_MOD_N > n) LOG_OCCURRENCES_MOD_N -= n; \
+  if (LOG_OCCURRENCES_MOD_N == 1) \
+    google::LogMessage( \
+        __FILE__, __LINE__, google::GLOG_ ## severity, LOG_OCCURRENCES, \
+        &what_to_do).stream()
+
+#define SOME_KIND_OF_LOG_IF_EVERY_N(severity, condition, n, what_to_do) \
+  static int LOG_OCCURRENCES = 0, LOG_OCCURRENCES_MOD_N = 0; \
+  ++LOG_OCCURRENCES; \
+  if (condition && \
+      ((LOG_OCCURRENCES_MOD_N=(LOG_OCCURRENCES_MOD_N + 1) % n) == (1 % n))) \
+    google::LogMessage( \
+        __FILE__, __LINE__, google::GLOG_ ## severity, LOG_OCCURRENCES, \
+                 &what_to_do).stream()
+
+#define SOME_KIND_OF_PLOG_EVERY_N(severity, n, what_to_do) \
+  static int LOG_OCCURRENCES = 0, LOG_OCCURRENCES_MOD_N = 0; \
+  ++LOG_OCCURRENCES; \
+  if (++LOG_OCCURRENCES_MOD_N > n) LOG_OCCURRENCES_MOD_N -= n; \
+  if (LOG_OCCURRENCES_MOD_N == 1) \
+    google::ErrnoLogMessage( \
+        __FILE__, __LINE__, google::GLOG_ ## severity, LOG_OCCURRENCES, \
+        &what_to_do).stream()
+
+#define SOME_KIND_OF_LOG_FIRST_N(severity, n, what_to_do) \
+  static int LOG_OCCURRENCES = 0; \
+  if (LOG_OCCURRENCES <= n) \
+    ++LOG_OCCURRENCES; \
+  if (LOG_OCCURRENCES <= n) \
+    google::LogMessage( \
+        __FILE__, __LINE__, google::GLOG_ ## severity, LOG_OCCURRENCES, \
+        &what_to_do).stream()
+
+namespace glog_internal_namespace_ {
+template <bool>
+struct CompileAssert {
+};
+struct CrashReason;
+
+// Returns true if FailureSignalHandler is installed.
+// Needs to be exported since it's used by the signalhandler_unittest.
+GOOGLE_GLOG_DLL_DECL bool IsFailureSignalHandlerInstalled();
+}  // namespace glog_internal_namespace_
+
+#define LOG_EVERY_N(severity, n)                                        \
+  SOME_KIND_OF_LOG_EVERY_N(severity, (n), google::LogMessage::SendToLog)
+
+#define SYSLOG_EVERY_N(severity, n) \
+  SOME_KIND_OF_LOG_EVERY_N(severity, (n), google::LogMessage::SendToSyslogAndLog)
+
+#define PLOG_EVERY_N(severity, n) \
+  SOME_KIND_OF_PLOG_EVERY_N(severity, (n), google::LogMessage::SendToLog)
+
+#define LOG_FIRST_N(severity, n) \
+  SOME_KIND_OF_LOG_FIRST_N(severity, (n), google::LogMessage::SendToLog)
+
+#define LOG_IF_EVERY_N(severity, condition, n) \
+  SOME_KIND_OF_LOG_IF_EVERY_N(severity, (condition), (n), google::LogMessage::SendToLog)
+
+// We want the special COUNTER value available for LOG_EVERY_X()'ed messages
+enum PRIVATE_Counter {COUNTER};
+
+#ifdef GLOG_NO_ABBREVIATED_SEVERITIES
+// wingdi.h defines ERROR to be 0. When we call LOG(ERROR), it gets
+// substituted with 0, and it expands to COMPACT_GOOGLE_LOG_0. To allow us
+// to keep using this syntax, we define this macro to do the same thing
+// as COMPACT_GOOGLE_LOG_ERROR.
+#define COMPACT_GOOGLE_LOG_0 COMPACT_GOOGLE_LOG_ERROR
+#define SYSLOG_0 SYSLOG_ERROR
+#define LOG_TO_STRING_0 LOG_TO_STRING_ERROR
+// Needed for LOG_IS_ON(ERROR).
+const LogSeverity GLOG_0 = GLOG_ERROR;
+#else
+// Users may include windows.h after logging.h without
+// GLOG_NO_ABBREVIATED_SEVERITIES nor WIN32_LEAN_AND_MEAN.
+// For this case, we cannot detect if ERROR is defined before users
+// actually use ERROR. Let's make an undefined symbol to warn users.
+# define GLOG_ERROR_MSG ERROR_macro_is_defined_Define_GLOG_NO_ABBREVIATED_SEVERITIES_before_including_logging_h_See_the_document_for_detail
+# define COMPACT_GOOGLE_LOG_0 GLOG_ERROR_MSG
+# define SYSLOG_0 GLOG_ERROR_MSG
+# define LOG_TO_STRING_0 GLOG_ERROR_MSG
+# define GLOG_0 GLOG_ERROR_MSG
+#endif
+
+// Plus some debug-logging macros that get compiled to nothing for production
+
+#if DCHECK_IS_ON()
+
+#define DLOG(severity) LOG(severity)
+#define DVLOG(verboselevel) VLOG(verboselevel)
+#define DLOG_IF(severity, condition) LOG_IF(severity, condition)
+#define DLOG_EVERY_N(severity, n) LOG_EVERY_N(severity, n)
+#define DLOG_IF_EVERY_N(severity, condition, n) \
+  LOG_IF_EVERY_N(severity, condition, n)
+#define DLOG_ASSERT(condition) LOG_ASSERT(condition)
+
+// debug-only checking.  executed if DCHECK_IS_ON().
+#define DCHECK(condition) CHECK(condition)
+#define DCHECK_EQ(val1, val2) CHECK_EQ(val1, val2)
+#define DCHECK_NE(val1, val2) CHECK_NE(val1, val2)
+#define DCHECK_LE(val1, val2) CHECK_LE(val1, val2)
+#define DCHECK_LT(val1, val2) CHECK_LT(val1, val2)
+#define DCHECK_GE(val1, val2) CHECK_GE(val1, val2)
+#define DCHECK_GT(val1, val2) CHECK_GT(val1, val2)
+#define DCHECK_NOTNULL(val) CHECK_NOTNULL(val)
+#define DCHECK_STREQ(str1, str2) CHECK_STREQ(str1, str2)
+#define DCHECK_STRCASEEQ(str1, str2) CHECK_STRCASEEQ(str1, str2)
+#define DCHECK_STRNE(str1, str2) CHECK_STRNE(str1, str2)
+#define DCHECK_STRCASENE(str1, str2) CHECK_STRCASENE(str1, str2)
+
+#else  // !DCHECK_IS_ON()
+
+#define DLOG(severity)  \
+  static_cast<void>(0), \
+  true ? (void) 0 : google::LogMessageVoidify() & LOG(severity)
+
+#define DVLOG(verboselevel)             \
+  static_cast<void>(0),                 \
+  (true || !VLOG_IS_ON(verboselevel)) ? \
+    (void) 0 : google::LogMessageVoidify() & LOG(INFO)
+
+#define DLOG_IF(severity, condition) \
+  static_cast<void>(0),              \
+  (true || !(condition)) ? (void) 0 : google::LogMessageVoidify() & LOG(severity)
+
+#define DLOG_EVERY_N(severity, n) \
+  static_cast<void>(0),           \
+  true ? (void) 0 : google::LogMessageVoidify() & LOG(severity)
+
+#define DLOG_IF_EVERY_N(severity, condition, n) \
+  static_cast<void>(0),                         \
+  (true || !(condition))? (void) 0 : google::LogMessageVoidify() & LOG(severity)
+
+#define DLOG_ASSERT(condition) \
+  static_cast<void>(0),        \
+  true ? (void) 0 : LOG_ASSERT(condition)
+
+// MSVC warning C4127: conditional expression is constant
+#define DCHECK(condition) \
+  GLOG_MSVC_PUSH_DISABLE_WARNING(4127) \
+  while (false) \
+    GLOG_MSVC_POP_WARNING() CHECK(condition)
+
+#define DCHECK_EQ(val1, val2) \
+  GLOG_MSVC_PUSH_DISABLE_WARNING(4127) \
+  while (false) \
+    GLOG_MSVC_POP_WARNING() CHECK_EQ(val1, val2)
+
+#define DCHECK_NE(val1, val2) \
+  GLOG_MSVC_PUSH_DISABLE_WARNING(4127) \
+  while (false) \
+    GLOG_MSVC_POP_WARNING() CHECK_NE(val1, val2)
+
+#define DCHECK_LE(val1, val2) \
+  GLOG_MSVC_PUSH_DISABLE_WARNING(4127) \
+  while (false) \
+    GLOG_MSVC_POP_WARNING() CHECK_LE(val1, val2)
+
+#define DCHECK_LT(val1, val2) \
+  GLOG_MSVC_PUSH_DISABLE_WARNING(4127) \
+  while (false) \
+    GLOG_MSVC_POP_WARNING() CHECK_LT(val1, val2)
+
+#define DCHECK_GE(val1, val2) \
+  GLOG_MSVC_PUSH_DISABLE_WARNING(4127) \
+  while (false) \
+    GLOG_MSVC_POP_WARNING() CHECK_GE(val1, val2)
+
+#define DCHECK_GT(val1, val2) \
+  GLOG_MSVC_PUSH_DISABLE_WARNING(4127) \
+  while (false) \
+    GLOG_MSVC_POP_WARNING() CHECK_GT(val1, val2)
+
+// You may see warnings in release mode if you don't use the return
+// value of DCHECK_NOTNULL. Please just use DCHECK for such cases.
+#define DCHECK_NOTNULL(val) (val)
+
+#define DCHECK_STREQ(str1, str2) \
+  GLOG_MSVC_PUSH_DISABLE_WARNING(4127) \
+  while (false) \
+    GLOG_MSVC_POP_WARNING() CHECK_STREQ(str1, str2)
+
+#define DCHECK_STRCASEEQ(str1, str2) \
+  GLOG_MSVC_PUSH_DISABLE_WARNING(4127) \
+  while (false) \
+    GLOG_MSVC_POP_WARNING() CHECK_STRCASEEQ(str1, str2)
+
+#define DCHECK_STRNE(str1, str2) \
+  GLOG_MSVC_PUSH_DISABLE_WARNING(4127) \
+  while (false) \
+    GLOG_MSVC_POP_WARNING() CHECK_STRNE(str1, str2)
+
+#define DCHECK_STRCASENE(str1, str2) \
+  GLOG_MSVC_PUSH_DISABLE_WARNING(4127) \
+  while (false) \
+    GLOG_MSVC_POP_WARNING() CHECK_STRCASENE(str1, str2)
+
+#endif  // DCHECK_IS_ON()
+
+// Log only in verbose mode.
+
+#define VLOG(verboselevel) LOG_IF(INFO, VLOG_IS_ON(verboselevel))
+
+#define VLOG_IF(verboselevel, condition) \
+  LOG_IF(INFO, (condition) && VLOG_IS_ON(verboselevel))
+
+#define VLOG_EVERY_N(verboselevel, n) \
+  LOG_IF_EVERY_N(INFO, VLOG_IS_ON(verboselevel), n)
+
+#define VLOG_IF_EVERY_N(verboselevel, condition, n) \
+  LOG_IF_EVERY_N(INFO, (condition) && VLOG_IS_ON(verboselevel), n)
+
+namespace base_logging {
+
+// LogMessage::LogStream is a std::ostream backed by this streambuf.
+// This class ignores overflow and leaves two bytes at the end of the
+// buffer to allow for a '\n' and '\0'.
+class GOOGLE_GLOG_DLL_DECL LogStreamBuf : public std::streambuf {
+ public:
+  // REQUIREMENTS: "len" must be >= 2 to account for the '\n' and '\0'.
+  LogStreamBuf(char *buf, int len) {
+    setp(buf, buf + len - 2);
+  }
+
+  // This effectively ignores overflow.
+  virtual int_type overflow(int_type ch) {
+    return ch;
+  }
+
+  // Legacy public ostrstream method.
+  size_t pcount() const { return pptr() - pbase(); }
+  char* pbase() const { return std::streambuf::pbase(); }
+};
+
+}  // namespace base_logging
+
+//
+// This class more or less represents a particular log message.  You
+// create an instance of LogMessage and then stream stuff to it.
+// When you finish streaming to it, ~LogMessage is called and the
+// full message gets streamed to the appropriate destination.
+//
+// You shouldn't actually use LogMessage's constructor to log things,
+// though.  You should use the LOG() macro (and variants thereof)
+// above.
+class GOOGLE_GLOG_DLL_DECL LogMessage {
+public:
+  enum {
+    // Passing kNoLogPrefix for the line number disables the
+    // log-message prefix. Useful for using the LogMessage
+    // infrastructure as a printing utility. See also the --log_prefix
+    // flag for controlling the log-message prefix on an
+    // application-wide basis.
+    kNoLogPrefix = -1
+  };
+
+  // LogStream inherit from non-DLL-exported class (std::ostrstream)
+  // and VC++ produces a warning for this situation.
+  // However, MSDN says "C4275 can be ignored in Microsoft Visual C++
+  // 2005 if you are deriving from a type in the Standard C++ Library"
+  // http://msdn.microsoft.com/en-us/library/3tdb471s(VS.80).aspx
+  // Let's just ignore the warning.
+GLOG_MSVC_PUSH_DISABLE_WARNING(4275)
+  class GOOGLE_GLOG_DLL_DECL LogStream : public std::ostream {
+GLOG_MSVC_POP_WARNING()
+  public:
+    LogStream(char *buf, int len, int ctr)
+        : std::ostream(NULL),
+          streambuf_(buf, len),
+          ctr_(ctr),
+          self_(this) {
+      rdbuf(&streambuf_);
+    }
+
+    int ctr() const { return ctr_; }
+    void set_ctr(int ctr) { ctr_ = ctr; }
+    LogStream* self() const { return self_; }
+
+    // Legacy std::streambuf methods.
+    size_t pcount() const { return streambuf_.pcount(); }
+    char* pbase() const { return streambuf_.pbase(); }
+    char* str() const { return pbase(); }
+
+  private:
+    LogStream(const LogStream&);
+    LogStream& operator=(const LogStream&);
+    base_logging::LogStreamBuf streambuf_;
+    int ctr_;  // Counter hack (for the LOG_EVERY_X() macro)
+    LogStream *self_;  // Consistency check hack
+  };
+
+public:
+  // icc 8 requires this typedef to avoid an internal compiler error.
+  typedef void (LogMessage::*SendMethod)();
+
+  LogMessage(const char* file, int line, LogSeverity severity, int ctr,
+             SendMethod send_method);
+
+  // Two special constructors that generate reduced amounts of code at
+  // LOG call sites for common cases.
+
+  // Used for LOG(INFO): Implied are:
+  // severity = INFO, ctr = 0, send_method = &LogMessage::SendToLog.
+  //
+  // Using this constructor instead of the more complex constructor above
+  // saves 19 bytes per call site.
+  LogMessage(const char* file, int line);
+
+  // Used for LOG(severity) where severity != INFO.  Implied
+  // are: ctr = 0, send_method = &LogMessage::SendToLog
+  //
+  // Using this constructor instead of the more complex constructor above
+  // saves 17 bytes per call site.
+  LogMessage(const char* file, int line, LogSeverity severity);
+
+  // Constructor to log this message to a specified sink (if not NULL).
+  // Implied are: ctr = 0, send_method = &LogMessage::SendToSinkAndLog if
+  // also_send_to_log is true, send_method = &LogMessage::SendToSink otherwise.
+  LogMessage(const char* file, int line, LogSeverity severity, LogSink* sink,
+             bool also_send_to_log);
+
+  // Constructor where we also give a vector<string> pointer
+  // for storing the messages (if the pointer is not NULL).
+  // Implied are: ctr = 0, send_method = &LogMessage::SaveOrSendToLog.
+  LogMessage(const char* file, int line, LogSeverity severity,
+             std::vector<std::string>* outvec);
+
+  // Constructor where we also give a string pointer for storing the
+  // message (if the pointer is not NULL).  Implied are: ctr = 0,
+  // send_method = &LogMessage::WriteToStringAndLog.
+  LogMessage(const char* file, int line, LogSeverity severity,
+             std::string* message);
+
+  // A special constructor used for check failures
+  LogMessage(const char* file, int line, const CheckOpString& result);
+
+  ~LogMessage();
+
+  // Flush a buffered message to the sink set in the constructor.  Always
+  // called by the destructor, it may also be called from elsewhere if
+  // needed.  Only the first call is actioned; any later ones are ignored.
+  void Flush();
+
+  // An arbitrary limit on the length of a single log message.  This
+  // is so that streaming can be done more efficiently.
+  static const size_t kMaxLogMessageLen;
+
+  // Theses should not be called directly outside of logging.*,
+  // only passed as SendMethod arguments to other LogMessage methods:
+  void SendToLog();  // Actually dispatch to the logs
+  void SendToSyslogAndLog();  // Actually dispatch to syslog and the logs
+
+  // Call abort() or similar to perform LOG(FATAL) crash.
+  static void __declspec(noreturn) Fail();
+
+  std::ostream& stream();
+
+  int preserved_errno() const;
+
+  // Must be called without the log_mutex held.  (L < log_mutex)
+  static int64 num_messages(int severity);
+
+  struct LogMessageData;
+
+private:
+  // Fully internal SendMethod cases:
+  void SendToSinkAndLog();  // Send to sink if provided and dispatch to the logs
+  void SendToSink();  // Send to sink if provided, do nothing otherwise.
+
+  // Write to string if provided and dispatch to the logs.
+  void WriteToStringAndLog();
+
+  void SaveOrSendToLog();  // Save to stringvec if provided, else to logs
+
+  void Init(const char* file, int line, LogSeverity severity,
+            void (LogMessage::*send_method)());
+
+  // Used to fill in crash information during LOG(FATAL) failures.
+  void RecordCrashReason(glog_internal_namespace_::CrashReason* reason);
+
+  // Counts of messages sent at each priority:
+  static int64 num_messages_[NUM_SEVERITIES];  // under log_mutex
+
+  // We keep the data in a separate struct so that each instance of
+  // LogMessage uses less stack space.
+  LogMessageData* allocated_;
+  LogMessageData* data_;
+
+  friend class LogDestination;
+
+  LogMessage(const LogMessage&);
+  void operator=(const LogMessage&);
+};
+
+// This class happens to be thread-hostile because all instances share
+// a single data buffer, but since it can only be created just before
+// the process dies, we don't worry so much.
+class GOOGLE_GLOG_DLL_DECL LogMessageFatal : public LogMessage {
+ public:
+  LogMessageFatal(const char* file, int line);
+  LogMessageFatal(const char* file, int line, const CheckOpString& result);
+  __declspec(noreturn) ~LogMessageFatal();
+};
+
+// A non-macro interface to the log facility; (useful
+// when the logging level is not a compile-time constant).
+inline void LogAtLevel(int const severity, std::string const &msg) {
+  LogMessage(__FILE__, __LINE__, severity).stream() << msg;
+}
+
+// A macro alternative of LogAtLevel. New code may want to use this
+// version since there are two advantages: 1. this version outputs the
+// file name and the line number where this macro is put like other
+// LOG macros, 2. this macro can be used as C++ stream.
+#define LOG_AT_LEVEL(severity) google::LogMessage(__FILE__, __LINE__, severity).stream()
+
+// Check if it's compiled in C++11 mode.
+//
+// GXX_EXPERIMENTAL_CXX0X is defined by gcc and clang up to at least
+// gcc-4.7 and clang-3.1 (2011-12-13).  __cplusplus was defined to 1
+// in gcc before 4.7 (Crosstool 16) and clang before 3.1, but is
+// defined according to the language version in effect thereafter.
+// Microsoft Visual Studio 14 (2015) sets __cplusplus==199711 despite
+// reasonably good C++11 support, so we set LANG_CXX for it and
+// newer versions (_MSC_VER >= 1900).
+#if (defined(__GXX_EXPERIMENTAL_CXX0X__) || __cplusplus >= 201103L || \
+     (defined(_MSC_VER) && _MSC_VER >= 1900))
+// Helper for CHECK_NOTNULL().
+//
+// In C++11, all cases can be handled by a single function. Since the value
+// category of the argument is preserved (also for rvalue references),
+// member initializer lists like the one below will compile correctly:
+//
+//   Foo()
+//     : x_(CHECK_NOTNULL(MethodReturningUniquePtr())) {}
+template <typename T>
+T CheckNotNull(const char* file, int line, const char* names, T&& t) {
+ if (t == nullptr) {
+   LogMessageFatal(file, line, new std::string(names));
+ }
+ return std::forward<T>(t);
+}
+
+#else
+
+// A small helper for CHECK_NOTNULL().
+template <typename T>
+T* CheckNotNull(const char *file, int line, const char *names, T* t) {
+  if (t == NULL) {
+    LogMessageFatal(file, line, new std::string(names));
+  }
+  return t;
+}
+#endif
+
+// Allow folks to put a counter in the LOG_EVERY_X()'ed messages. This
+// only works if ostream is a LogStream. If the ostream is not a
+// LogStream you'll get an assert saying as much at runtime.
+GOOGLE_GLOG_DLL_DECL std::ostream& operator<<(std::ostream &os,
+                                              const PRIVATE_Counter&);
+
+
+// Derived class for PLOG*() above.
+class GOOGLE_GLOG_DLL_DECL ErrnoLogMessage : public LogMessage {
+ public:
+
+  ErrnoLogMessage(const char* file, int line, LogSeverity severity, int ctr,
+                  void (LogMessage::*send_method)());
+
+  // Postpends ": strerror(errno) [errno]".
+  ~ErrnoLogMessage();
+
+ private:
+  ErrnoLogMessage(const ErrnoLogMessage&);
+  void operator=(const ErrnoLogMessage&);
+};
+
+
+// This class is used to explicitly ignore values in the conditional
+// logging macros.  This avoids compiler warnings like "value computed
+// is not used" and "statement has no effect".
+
+class GOOGLE_GLOG_DLL_DECL LogMessageVoidify {
+ public:
+  LogMessageVoidify() { }
+  // This has to be an operator with a precedence lower than << but
+  // higher than ?:
+  void operator&(std::ostream&) { }
+};
+
+
+// Flushes all log files that contains messages that are at least of
+// the specified severity level.  Thread-safe.
+GOOGLE_GLOG_DLL_DECL void FlushLogFiles(LogSeverity min_severity);
+
+// Flushes all log files that contains messages that are at least of
+// the specified severity level. Thread-hostile because it ignores
+// locking -- used for catastrophic failures.
+GOOGLE_GLOG_DLL_DECL void FlushLogFilesUnsafe(LogSeverity min_severity);
+
+//
+// Set the destination to which a particular severity level of log
+// messages is sent.  If base_filename is "", it means "don't log this
+// severity".  Thread-safe.
+//
+GOOGLE_GLOG_DLL_DECL void SetLogDestination(LogSeverity severity,
+                                            const char* base_filename);
+
+//
+// Set the basename of the symlink to the latest log file at a given
+// severity.  If symlink_basename is empty, do not make a symlink.  If
+// you don't call this function, the symlink basename is the
+// invocation name of the program.  Thread-safe.
+//
+GOOGLE_GLOG_DLL_DECL void SetLogSymlink(LogSeverity severity,
+                                        const char* symlink_basename);
+
+//
+// Used to send logs to some other kind of destination
+// Users should subclass LogSink and override send to do whatever they want.
+// Implementations must be thread-safe because a shared instance will
+// be called from whichever thread ran the LOG(XXX) line.
+class GOOGLE_GLOG_DLL_DECL LogSink {
+ public:
+  virtual ~LogSink();
+
+  // Sink's logging logic (message_len is such as to exclude '\n' at the end).
+  // This method can't use LOG() or CHECK() as logging system mutex(s) are held
+  // during this call.
+  virtual void send(LogSeverity severity, const char* full_filename,
+                    const char* base_filename, int line,
+                    const struct ::tm* tm_time,
+                    const char* message, size_t message_len, int32 usecs) {
+    send(severity, full_filename, base_filename, line,
+         tm_time, message, message_len);
+  }
+  // This send() signature is obsolete.
+  // New implementations should define this in terms of
+  // the above send() method.
+  virtual void send(LogSeverity severity, const char* full_filename,
+                    const char* base_filename, int line,
+                    const struct ::tm* tm_time,
+                    const char* message, size_t message_len) = 0;
+
+  // Redefine this to implement waiting for
+  // the sink's logging logic to complete.
+  // It will be called after each send() returns,
+  // but before that LogMessage exits or crashes.
+  // By default this function does nothing.
+  // Using this function one can implement complex logic for send()
+  // that itself involves logging; and do all this w/o causing deadlocks and
+  // inconsistent rearrangement of log messages.
+  // E.g. if a LogSink has thread-specific actions, the send() method
+  // can simply add the message to a queue and wake up another thread that
+  // handles real logging while itself making some LOG() calls;
+  // WaitTillSent() can be implemented to wait for that logic to complete.
+  // See our unittest for an example.
+  virtual void WaitTillSent();
+
+  // Returns the normal text output of the log message.
+  // Can be useful to implement send().
+  static std::string ToString(LogSeverity severity, const char* file, int line,
+                              const struct ::tm* tm_time,
+                              const char* message, size_t message_len,
+                              int32 usecs);
+
+  // Obsolete
+  static std::string ToString(LogSeverity severity, const char* file, int line,
+                              const struct ::tm* tm_time,
+                              const char* message, size_t message_len) {
+    return ToString(severity, file, line, tm_time, message, message_len, 0);
+  }
+};
+
+// Add or remove a LogSink as a consumer of logging data.  Thread-safe.
+GOOGLE_GLOG_DLL_DECL void AddLogSink(LogSink *destination);
+GOOGLE_GLOG_DLL_DECL void RemoveLogSink(LogSink *destination);
+
+//
+// Specify an "extension" added to the filename specified via
+// SetLogDestination.  This applies to all severity levels.  It's
+// often used to append the port we're listening on to the logfile
+// name.  Thread-safe.
+//
+GOOGLE_GLOG_DLL_DECL void SetLogFilenameExtension(
+    const char* filename_extension);
+
+//
+// Make it so that all log messages of at least a particular severity
+// are logged to stderr (in addition to logging to the usual log
+// file(s)).  Thread-safe.
+//
+GOOGLE_GLOG_DLL_DECL void SetStderrLogging(LogSeverity min_severity);
+
+//
+// Make it so that all log messages go only to stderr.  Thread-safe.
+//
+GOOGLE_GLOG_DLL_DECL void LogToStderr();
+
+//
+// Make it so that all log messages of at least a particular severity are
+// logged via email to a list of addresses (in addition to logging to the
+// usual log file(s)).  The list of addresses is just a string containing
+// the email addresses to send to (separated by spaces, say).  Thread-safe.
+//
+GOOGLE_GLOG_DLL_DECL void SetEmailLogging(LogSeverity min_severity,
+                                          const char* addresses);
+
+// A simple function that sends email. dest is a commma-separated
+// list of addressess.  Thread-safe.
+GOOGLE_GLOG_DLL_DECL bool SendEmail(const char *dest,
+                                    const char *subject, const char *body);
+
+GOOGLE_GLOG_DLL_DECL const std::vector<std::string>& GetLoggingDirectories();
+
+// For tests only:  Clear the internal [cached] list of logging directories to
+// force a refresh the next time GetLoggingDirectories is called.
+// Thread-hostile.
+void TestOnly_ClearLoggingDirectoriesList();
+
+// Returns a set of existing temporary directories, which will be a
+// subset of the directories returned by GetLogginDirectories().
+// Thread-safe.
+GOOGLE_GLOG_DLL_DECL void GetExistingTempDirectories(
+    std::vector<std::string>* list);
+
+// Print any fatal message again -- useful to call from signal handler
+// so that the last thing in the output is the fatal message.
+// Thread-hostile, but a race is unlikely.
+GOOGLE_GLOG_DLL_DECL void ReprintFatalMessage();
+
+// Truncate a log file that may be the append-only output of multiple
+// processes and hence can't simply be renamed/reopened (typically a
+// stdout/stderr).  If the file "path" is > "limit" bytes, copy the
+// last "keep" bytes to offset 0 and truncate the rest. Since we could
+// be racing with other writers, this approach has the potential to
+// lose very small amounts of data. For security, only follow symlinks
+// if the path is /proc/self/fd/*
+GOOGLE_GLOG_DLL_DECL void TruncateLogFile(const char *path,
+                                          int64 limit, int64 keep);
+
+// Truncate stdout and stderr if they are over the value specified by
+// --max_log_size; keep the final 1MB.  This function has the same
+// race condition as TruncateLogFile.
+GOOGLE_GLOG_DLL_DECL void TruncateStdoutStderr();
+
+// Return the string representation of the provided LogSeverity level.
+// Thread-safe.
+GOOGLE_GLOG_DLL_DECL const char* GetLogSeverityName(LogSeverity severity);
+
+// ---------------------------------------------------------------------
+// Implementation details that are not useful to most clients
+// ---------------------------------------------------------------------
+
+// A Logger is the interface used by logging modules to emit entries
+// to a log.  A typical implementation will dump formatted data to a
+// sequence of files.  We also provide interfaces that will forward
+// the data to another thread so that the invoker never blocks.
+// Implementations should be thread-safe since the logging system
+// will write to them from multiple threads.
+
+namespace base {
+
+class GOOGLE_GLOG_DLL_DECL Logger {
+ public:
+  virtual ~Logger();
+
+  // Writes "message[0,message_len-1]" corresponding to an event that
+  // occurred at "timestamp".  If "force_flush" is true, the log file
+  // is flushed immediately.
+  //
+  // The input message has already been formatted as deemed
+  // appropriate by the higher level logging facility.  For example,
+  // textual log messages already contain timestamps, and the
+  // file:linenumber header.
+  virtual void Write(bool force_flush,
+                     time_t timestamp,
+                     const char* message,
+                     int message_len) = 0;
+
+  // Flush any buffered messages
+  virtual void Flush() = 0;
+
+  // Get the current LOG file size.
+  // The returned value is approximate since some
+  // logged data may not have been flushed to disk yet.
+  virtual uint32 LogSize() = 0;
+};
+
+// Get the logger for the specified severity level.  The logger
+// remains the property of the logging module and should not be
+// deleted by the caller.  Thread-safe.
+extern GOOGLE_GLOG_DLL_DECL Logger* GetLogger(LogSeverity level);
+
+// Set the logger for the specified severity level.  The logger
+// becomes the property of the logging module and should not
+// be deleted by the caller.  Thread-safe.
+extern GOOGLE_GLOG_DLL_DECL void SetLogger(LogSeverity level, Logger* logger);
+
+}
+
+// glibc has traditionally implemented two incompatible versions of
+// strerror_r(). There is a poorly defined convention for picking the
+// version that we want, but it is not clear whether it even works with
+// all versions of glibc.
+// So, instead, we provide this wrapper that automatically detects the
+// version that is in use, and then implements POSIX semantics.
+// N.B. In addition to what POSIX says, we also guarantee that "buf" will
+// be set to an empty string, if this function failed. This means, in most
+// cases, you do not need to check the error code and you can directly
+// use the value of "buf". It will never have an undefined value.
+// DEPRECATED: Use StrError(int) instead.
+GOOGLE_GLOG_DLL_DECL int posix_strerror_r(int err, char *buf, size_t len);
+
+// A thread-safe replacement for strerror(). Returns a string describing the
+// given POSIX error code.
+GOOGLE_GLOG_DLL_DECL std::string StrError(int err);
+
+// A class for which we define operator<<, which does nothing.
+class GOOGLE_GLOG_DLL_DECL NullStream : public LogMessage::LogStream {
+ public:
+  // Initialize the LogStream so the messages can be written somewhere
+  // (they'll never be actually displayed). This will be needed if a
+  // NullStream& is implicitly converted to LogStream&, in which case
+  // the overloaded NullStream::operator<< will not be invoked.
+  NullStream() : LogMessage::LogStream(message_buffer_, 1, 0) { }
+  NullStream(const char* /*file*/, int /*line*/,
+             const CheckOpString& /*result*/) :
+      LogMessage::LogStream(message_buffer_, 1, 0) { }
+  NullStream &stream() { return *this; }
+ private:
+  // A very short buffer for messages (which we discard anyway). This
+  // will be needed if NullStream& converted to LogStream& (e.g. as a
+  // result of a conditional expression).
+  char message_buffer_[2];
+};
+
+// Do nothing. This operator is inline, allowing the message to be
+// compiled away. The message will not be compiled away if we do
+// something like (flag ? LOG(INFO) : LOG(ERROR)) << message; when
+// SKIP_LOG=WARNING. In those cases, NullStream will be implicitly
+// converted to LogStream and the message will be computed and then
+// quietly discarded.
+template<class T>
+inline NullStream& operator<<(NullStream &str, const T &) { return str; }
+
+// Similar to NullStream, but aborts the program (without stack
+// trace), like LogMessageFatal.
+class GOOGLE_GLOG_DLL_DECL NullStreamFatal : public NullStream {
+ public:
+  NullStreamFatal() { }
+  NullStreamFatal(const char* file, int line, const CheckOpString& result) :
+      NullStream(file, line, result) { }
+  __declspec(noreturn) ~NullStreamFatal() throw () { _exit(1); }
+};
+
+// Install a signal handler that will dump signal information and a stack
+// trace when the program crashes on certain signals.  We'll install the
+// signal handler for the following signals.
+//
+// SIGSEGV, SIGILL, SIGFPE, SIGABRT, SIGBUS, and SIGTERM.
+//
+// By default, the signal handler will write the failure dump to the
+// standard error.  You can customize the destination by installing your
+// own writer function by InstallFailureWriter() below.
+//
+// Note on threading:
+//
+// The function should be called before threads are created, if you want
+// to use the failure signal handler for all threads.  The stack trace
+// will be shown only for the thread that receives the signal.  In other
+// words, stack traces of other threads won't be shown.
+GOOGLE_GLOG_DLL_DECL void InstallFailureSignalHandler();
+
+// Installs a function that is used for writing the failure dump.  "data"
+// is the pointer to the beginning of a message to be written, and "size"
+// is the size of the message.  You should not expect the data is
+// terminated with '\0'.
+GOOGLE_GLOG_DLL_DECL void InstallFailureWriter(
+    void (*writer)(const char* data, int size));
+
+}
+
+#endif // _LOGGING_H_
diff --git a/src/windows/glog/raw_logging.h b/src/windows/glog/raw_logging.h
new file mode 100755
index 000000000000..e0e6d6f1a256
--- /dev/null
+++ b/src/windows/glog/raw_logging.h
@@ -0,0 +1,184 @@
+// This file is automatically generated from src/glog/raw_logging.h.in
+// using src/windows/preprocess.sh.
+// DO NOT EDIT!
+
+// Copyright (c) 2006, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Author: Maxim Lifantsev
+//
+// Thread-safe logging routines that do not allocate any memory or
+// acquire any locks, and can therefore be used by low-level memory
+// allocation and synchronization code.
+
+#ifndef BASE_RAW_LOGGING_H_
+#define BASE_RAW_LOGGING_H_
+
+#include <time.h>
+
+namespace google {
+
+#include "glog/log_severity.h"
+#include "glog/vlog_is_on.h"
+
+// Annoying stuff for windows -- makes sure clients can import these functions
+#ifndef GOOGLE_GLOG_DLL_DECL
+# if defined(_WIN32) && !defined(__CYGWIN__)
+#   define GOOGLE_GLOG_DLL_DECL  __declspec(dllimport)
+# else
+#   define GOOGLE_GLOG_DLL_DECL
+# endif
+#endif
+
+// This is similar to LOG(severity) << format... and VLOG(level) << format..,
+// but
+// * it is to be used ONLY by low-level modules that can't use normal LOG()
+// * it is desiged to be a low-level logger that does not allocate any
+//   memory and does not need any locks, hence:
+// * it logs straight and ONLY to STDERR w/o buffering
+// * it uses an explicit format and arguments list
+// * it will silently chop off really long message strings
+// Usage example:
+//   RAW_LOG(ERROR, "Failed foo with %i: %s", status, error);
+//   RAW_VLOG(3, "status is %i", status);
+// These will print an almost standard log lines like this to stderr only:
+//   E0821 211317 file.cc:123] RAW: Failed foo with 22: bad_file
+//   I0821 211317 file.cc:142] RAW: status is 20
+#define RAW_LOG(severity, ...) \
+  do { \
+    switch (google::GLOG_ ## severity) {  \
+      case 0: \
+        RAW_LOG_INFO(__VA_ARGS__); \
+        break; \
+      case 1: \
+        RAW_LOG_WARNING(__VA_ARGS__); \
+        break; \
+      case 2: \
+        RAW_LOG_ERROR(__VA_ARGS__); \
+        break; \
+      case 3: \
+        RAW_LOG_FATAL(__VA_ARGS__); \
+        break; \
+      default: \
+        break; \
+    } \
+  } while (0)
+
+// The following STRIP_LOG testing is performed in the header file so that it's
+// possible to completely compile out the logging code and the log messages.
+#if STRIP_LOG == 0
+#define RAW_VLOG(verboselevel, ...) \
+  do { \
+    if (VLOG_IS_ON(verboselevel)) { \
+      RAW_LOG_INFO(__VA_ARGS__); \
+    } \
+  } while (0)
+#else
+#define RAW_VLOG(verboselevel, ...) RawLogStub__(0, __VA_ARGS__)
+#endif // STRIP_LOG == 0
+
+#if STRIP_LOG == 0
+#define RAW_LOG_INFO(...) google::RawLog__(google::GLOG_INFO, \
+                                   __FILE__, __LINE__, __VA_ARGS__)
+#else
+#define RAW_LOG_INFO(...) google::RawLogStub__(0, __VA_ARGS__)
+#endif // STRIP_LOG == 0
+
+#if STRIP_LOG <= 1
+#define RAW_LOG_WARNING(...) google::RawLog__(google::GLOG_WARNING,   \
+                                      __FILE__, __LINE__, __VA_ARGS__)
+#else
+#define RAW_LOG_WARNING(...) google::RawLogStub__(0, __VA_ARGS__)
+#endif // STRIP_LOG <= 1
+
+#if STRIP_LOG <= 2
+#define RAW_LOG_ERROR(...) google::RawLog__(google::GLOG_ERROR,       \
+                                    __FILE__, __LINE__, __VA_ARGS__)
+#else
+#define RAW_LOG_ERROR(...) google::RawLogStub__(0, __VA_ARGS__)
+#endif // STRIP_LOG <= 2
+
+#if STRIP_LOG <= 3
+#define RAW_LOG_FATAL(...) google::RawLog__(google::GLOG_FATAL,       \
+                                    __FILE__, __LINE__, __VA_ARGS__)
+#else
+#define RAW_LOG_FATAL(...) \
+  do { \
+    google::RawLogStub__(0, __VA_ARGS__);        \
+    exit(1); \
+  } while (0)
+#endif // STRIP_LOG <= 3
+
+// Similar to CHECK(condition) << message,
+// but for low-level modules: we use only RAW_LOG that does not allocate memory.
+// We do not want to provide args list here to encourage this usage:
+//   if (!cond)  RAW_LOG(FATAL, "foo ...", hard_to_compute_args);
+// so that the args are not computed when not needed.
+#define RAW_CHECK(condition, message)                                   \
+  do {                                                                  \
+    if (!(condition)) {                                                 \
+      RAW_LOG(FATAL, "Check %s failed: %s", #condition, message);       \
+    }                                                                   \
+  } while (0)
+
+// Debug versions of RAW_LOG and RAW_CHECK
+#ifndef NDEBUG
+
+#define RAW_DLOG(severity, ...) RAW_LOG(severity, __VA_ARGS__)
+#define RAW_DCHECK(condition, message) RAW_CHECK(condition, message)
+
+#else  // NDEBUG
+
+#define RAW_DLOG(severity, ...)                                 \
+  while (false)                                                 \
+    RAW_LOG(severity, __VA_ARGS__)
+#define RAW_DCHECK(condition, message) \
+  while (false) \
+    RAW_CHECK(condition, message)
+
+#endif  // NDEBUG
+
+// Stub log function used to work around for unused variable warnings when
+// building with STRIP_LOG > 0.
+static inline void RawLogStub__(int /* ignored */, ...) {
+}
+
+// Helper function to implement RAW_LOG and RAW_VLOG
+// Logs format... at "severity" level, reporting it
+// as called from file:line.
+// This does not allocate memory or acquire locks.
+GOOGLE_GLOG_DLL_DECL void RawLog__(LogSeverity severity,
+                                   const char* file,
+                                   int line,
+                                   const char* format, ...)
+   ;
+
+}
+
+#endif  // BASE_RAW_LOGGING_H_
diff --git a/src/windows/glog/stl_logging.h b/src/windows/glog/stl_logging.h
new file mode 100755
index 000000000000..a97a90895959
--- /dev/null
+++ b/src/windows/glog/stl_logging.h
@@ -0,0 +1,224 @@
+// This file is automatically generated from src/glog/stl_logging.h.in
+// using src/windows/preprocess.sh.
+// DO NOT EDIT!
+
+// Copyright (c) 2003, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Stream output operators for STL containers; to be used for logging *only*.
+// Inclusion of this file lets you do:
+//
+// list<string> x;
+// LOG(INFO) << "data: " << x;
+// vector<int> v1, v2;
+// CHECK_EQ(v1, v2);
+//
+// If you want to use this header file with hash_compare maps or slist, you
+// need to define macros before including this file:
+//
+// - GLOG_STL_LOGGING_FOR_UNORDERED     - <unordered_map> and <unordered_set>
+// - GLOG_STL_LOGGING_FOR_TR1_UNORDERED - <tr1/unordered_(map|set)>
+// - GLOG_STL_LOGGING_FOR_EXT_HASH      - <ext/hash_(map|set)>
+// - GLOG_STL_LOGGING_FOR_EXT_SLIST     - <ext/slist>
+//
+
+#ifndef UTIL_GTL_STL_LOGGING_INL_H_
+#define UTIL_GTL_STL_LOGGING_INL_H_
+
+#if !1
+# error We do not support stl_logging for this compiler
+#endif
+
+#include <deque>
+#include <list>
+#include <map>
+#include <ostream>
+#include <set>
+#include <utility>
+#include <vector>
+
+#ifdef GLOG_STL_LOGGING_FOR_UNORDERED
+# include <unordered_map>
+# include <unordered_set>
+#endif
+
+#ifdef GLOG_STL_LOGGING_FOR_TR1_UNORDERED
+# include <tr1/unordered_map>
+# include <tr1/unordered_set>
+#endif
+
+#ifdef GLOG_STL_LOGGING_FOR_EXT_HASH
+# include <ext/hash_set>
+# include <ext/hash_map>
+#endif
+#ifdef GLOG_STL_LOGGING_FOR_EXT_SLIST
+# include <ext/slist>
+#endif
+
+// Forward declare these two, and define them after all the container streams
+// operators so that we can recurse from pair -> container -> container -> pair
+// properly.
+template<class First, class Second>
+std::ostream& operator<<(std::ostream& out, const std::pair<First, Second>& p);
+
+namespace google {
+
+template<class Iter>
+void PrintSequence(std::ostream& out, Iter begin, Iter end);
+
+}
+
+#define OUTPUT_TWO_ARG_CONTAINER(Sequence) \
+template<class T1, class T2> \
+inline std::ostream& operator<<(std::ostream& out, \
+                                const Sequence<T1, T2>& seq) { \
+  google::PrintSequence(out, seq.begin(), seq.end()); \
+  return out; \
+}
+
+OUTPUT_TWO_ARG_CONTAINER(std::vector)
+OUTPUT_TWO_ARG_CONTAINER(std::deque)
+OUTPUT_TWO_ARG_CONTAINER(std::list)
+#ifdef GLOG_STL_LOGGING_FOR_EXT_SLIST
+OUTPUT_TWO_ARG_CONTAINER(__gnu_cxx::slist)
+#endif
+
+#undef OUTPUT_TWO_ARG_CONTAINER
+
+#define OUTPUT_THREE_ARG_CONTAINER(Sequence) \
+template<class T1, class T2, class T3> \
+inline std::ostream& operator<<(std::ostream& out, \
+                                const Sequence<T1, T2, T3>& seq) { \
+  google::PrintSequence(out, seq.begin(), seq.end()); \
+  return out; \
+}
+
+OUTPUT_THREE_ARG_CONTAINER(std::set)
+OUTPUT_THREE_ARG_CONTAINER(std::multiset)
+
+#undef OUTPUT_THREE_ARG_CONTAINER
+
+#define OUTPUT_FOUR_ARG_CONTAINER(Sequence) \
+template<class T1, class T2, class T3, class T4> \
+inline std::ostream& operator<<(std::ostream& out, \
+                                const Sequence<T1, T2, T3, T4>& seq) { \
+  google::PrintSequence(out, seq.begin(), seq.end()); \
+  return out; \
+}
+
+OUTPUT_FOUR_ARG_CONTAINER(std::map)
+OUTPUT_FOUR_ARG_CONTAINER(std::multimap)
+#ifdef GLOG_STL_LOGGING_FOR_UNORDERED
+OUTPUT_FOUR_ARG_CONTAINER(std::unordered_set)
+OUTPUT_FOUR_ARG_CONTAINER(std::unordered_multiset)
+#endif
+#ifdef GLOG_STL_LOGGING_FOR_TR1_UNORDERED
+OUTPUT_FOUR_ARG_CONTAINER(std::tr1::unordered_set)
+OUTPUT_FOUR_ARG_CONTAINER(std::tr1::unordered_multiset)
+#endif
+#ifdef GLOG_STL_LOGGING_FOR_EXT_HASH
+OUTPUT_FOUR_ARG_CONTAINER(__gnu_cxx::hash_set)
+OUTPUT_FOUR_ARG_CONTAINER(__gnu_cxx::hash_multiset)
+#endif
+
+#undef OUTPUT_FOUR_ARG_CONTAINER
+
+#define OUTPUT_FIVE_ARG_CONTAINER(Sequence) \
+template<class T1, class T2, class T3, class T4, class T5> \
+inline std::ostream& operator<<(std::ostream& out, \
+                                const Sequence<T1, T2, T3, T4, T5>& seq) { \
+  google::PrintSequence(out, seq.begin(), seq.end()); \
+  return out; \
+}
+
+#ifdef GLOG_STL_LOGGING_FOR_UNORDERED
+OUTPUT_FIVE_ARG_CONTAINER(std::unordered_map)
+OUTPUT_FIVE_ARG_CONTAINER(std::unordered_multimap)
+#endif
+#ifdef GLOG_STL_LOGGING_FOR_TR1_UNORDERED
+OUTPUT_FIVE_ARG_CONTAINER(std::tr1::unordered_map)
+OUTPUT_FIVE_ARG_CONTAINER(std::tr1::unordered_multimap)
+#endif
+#ifdef GLOG_STL_LOGGING_FOR_EXT_HASH
+OUTPUT_FIVE_ARG_CONTAINER(__gnu_cxx::hash_map)
+OUTPUT_FIVE_ARG_CONTAINER(__gnu_cxx::hash_multimap)
+#endif
+
+#undef OUTPUT_FIVE_ARG_CONTAINER
+
+template<class First, class Second>
+inline std::ostream& operator<<(std::ostream& out,
+                                const std::pair<First, Second>& p) {
+  out << '(' << p.first << ", " << p.second << ')';
+  return out;
+}
+
+namespace google {
+
+template<class Iter>
+inline void PrintSequence(std::ostream& out, Iter begin, Iter end) {
+  // Output at most 100 elements -- appropriate if used for logging.
+  for (int i = 0; begin != end && i < 100; ++i, ++begin) {
+    if (i > 0) out << ' ';
+    out << *begin;
+  }
+  if (begin != end) {
+    out << " ...";
+  }
+}
+
+}
+
+// Note that this is technically undefined behavior! We are adding things into
+// the std namespace for a reason though -- we are providing new operations on
+// types which are themselves defined with this namespace. Without this, these
+// operator overloads cannot be found via ADL. If these definitions are not
+// found via ADL, they must be #included before they're used, which requires
+// this header to be included before apparently independent other headers.
+//
+// For example, base/logging.h defines various template functions to implement
+// CHECK_EQ(x, y) and stream x and y into the log in the event the check fails.
+// It does so via the function template MakeCheckOpValueString:
+//   template<class T>
+//   void MakeCheckOpValueString(strstream* ss, const T& v) {
+//     (*ss) << v;
+//   }
+// Because 'glog/logging.h' is included before 'glog/stl_logging.h',
+// subsequent CHECK_EQ(v1, v2) for vector<...> typed variable v1 and v2 can only
+// find these operator definitions via ADL.
+//
+// Even this solution has problems -- it may pull unintended operators into the
+// namespace as well, allowing them to also be found via ADL, and creating code
+// that only works with a particular order of includes. Long term, we need to
+// move all of the *definitions* into namespace std, bet we need to ensure no
+// one references them first. This lets us take that step. We cannot define them
+// in both because that would create ambiguous overloads when both are found.
+namespace std { using ::operator<<; }
+
+#endif  // UTIL_GTL_STL_LOGGING_INL_H_
diff --git a/src/windows/glog/vlog_is_on.h b/src/windows/glog/vlog_is_on.h
new file mode 100755
index 000000000000..409a4011b385
--- /dev/null
+++ b/src/windows/glog/vlog_is_on.h
@@ -0,0 +1,133 @@
+// This file is automatically generated from src/glog/vlog_is_on.h.in
+// using src/windows/preprocess.sh.
+// DO NOT EDIT!
+
+// Copyright (c) 1999, 2007, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Author: Ray Sidney and many others
+//
+// Defines the VLOG_IS_ON macro that controls the variable-verbosity
+// conditional logging.
+//
+// It's used by VLOG and VLOG_IF in logging.h
+// and by RAW_VLOG in raw_logging.h to trigger the logging.
+//
+// It can also be used directly e.g. like this:
+//   if (VLOG_IS_ON(2)) {
+//     // do some logging preparation and logging
+//     // that can't be accomplished e.g. via just VLOG(2) << ...;
+//   }
+//
+// The truth value that VLOG_IS_ON(level) returns is determined by 
+// the three verbosity level flags:
+//   --v=<n>  Gives the default maximal active V-logging level;
+//            0 is the default.
+//            Normally positive values are used for V-logging levels.
+//   --vmodule=<str>  Gives the per-module maximal V-logging levels to override
+//                    the value given by --v.
+//                    E.g. "my_module=2,foo*=3" would change the logging level
+//                    for all code in source files "my_module.*" and "foo*.*"
+//                    ("-inl" suffixes are also disregarded for this matching).
+//
+// SetVLOGLevel helper function is provided to do limited dynamic control over
+// V-logging by overriding the per-module settings given via --vmodule flag.
+//
+// CAVEAT: --vmodule functionality is not available in non gcc compilers.
+//
+
+#ifndef BASE_VLOG_IS_ON_H_
+#define BASE_VLOG_IS_ON_H_
+
+#include "glog/log_severity.h"
+
+// Annoying stuff for windows -- makes sure clients can import these functions
+#ifndef GOOGLE_GLOG_DLL_DECL
+# if defined(_WIN32) && !defined(__CYGWIN__)
+#   define GOOGLE_GLOG_DLL_DECL  __declspec(dllimport)
+# else
+#   define GOOGLE_GLOG_DLL_DECL
+# endif
+#endif
+
+#if defined(__GNUC__)
+// We emit an anonymous static int* variable at every VLOG_IS_ON(n) site.
+// (Normally) the first time every VLOG_IS_ON(n) site is hit,
+// we determine what variable will dynamically control logging at this site:
+// it's either FLAGS_v or an appropriate internal variable
+// matching the current source file that represents results of
+// parsing of --vmodule flag and/or SetVLOGLevel calls.
+#define VLOG_IS_ON(verboselevel)                                \
+  __extension__  \
+  ({ static google::int32* vlocal__ = &google::kLogSiteUninitialized;           \
+     google::int32 verbose_level__ = (verboselevel);                    \
+     (*vlocal__ >= verbose_level__) &&                          \
+     ((vlocal__ != &google::kLogSiteUninitialized) ||                   \
+      (google::InitVLOG3__(&vlocal__, &FLAGS_v,                         \
+                   __FILE__, verbose_level__))); })
+#else
+// GNU extensions not available, so we do not support --vmodule.
+// Dynamic value of FLAGS_v always controls the logging level.
+#define VLOG_IS_ON(verboselevel) (FLAGS_v >= (verboselevel))
+#endif
+
+// Set VLOG(_IS_ON) level for module_pattern to log_level.
+// This lets us dynamically control what is normally set by the --vmodule flag.
+// Returns the level that previously applied to module_pattern.
+// NOTE: To change the log level for VLOG(_IS_ON) sites
+//	 that have already executed after/during InitGoogleLogging,
+//	 one needs to supply the exact --vmodule pattern that applied to them.
+//       (If no --vmodule pattern applied to them
+//       the value of FLAGS_v will continue to control them.)
+extern GOOGLE_GLOG_DLL_DECL int SetVLOGLevel(const char* module_pattern,
+                                             int log_level);
+
+// Various declarations needed for VLOG_IS_ON above: =========================
+
+// Special value used to indicate that a VLOG_IS_ON site has not been
+// initialized.  We make this a large value, so the common-case check
+// of "*vlocal__ >= verbose_level__" in VLOG_IS_ON definition
+// passes in such cases and InitVLOG3__ is then triggered.
+extern google::int32 kLogSiteUninitialized;
+
+// Helper routine which determines the logging info for a particalur VLOG site.
+//   site_flag     is the address of the site-local pointer to the controlling
+//                 verbosity level
+//   site_default  is the default to use for *site_flag
+//   fname         is the current source file name
+//   verbose_level is the argument to VLOG_IS_ON
+// We will return the return value for VLOG_IS_ON
+// and if possible set *site_flag appropriately.
+extern GOOGLE_GLOG_DLL_DECL bool InitVLOG3__(
+    google::int32** site_flag,
+    google::int32* site_default,
+    const char* fname,
+    google::int32 verbose_level);
+
+#endif  // BASE_VLOG_IS_ON_H_
diff --git a/src/windows/port.cc b/src/windows/port.cc
new file mode 100755
index 000000000000..19bda367c62b
--- /dev/null
+++ b/src/windows/port.cc
@@ -0,0 +1,65 @@
+/* Copyright (c) 2008, Google Inc.
+ * All rights reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * 
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * ---
+ * Author: Craig Silverstein
+ * Copied from google-perftools and modified by Shinichiro Hamaji
+ */
+
+#ifndef _WIN32
+# error You should only be including windows/port.cc in a windows environment!
+#endif
+
+#include "config.h"
+#include <stdarg.h>    // for va_list, va_start, va_end
+#include "port.h"
+
+// These call the windows _vsnprintf, but always NUL-terminate.
+int safe_vsnprintf(char *str, size_t size, const char *format, va_list ap) {
+  if (size == 0)        // not even room for a \0?
+    return -1;          // not what C99 says to do, but what windows does
+  str[size-1] = '\0';
+  return _vsnprintf(str, size-1, format, ap);
+}
+
+#ifndef HAVE_LOCALTIME_R
+struct tm* localtime_r(const time_t* timep, struct tm* result) {
+  localtime_s(result, timep);
+  return result;
+}
+#endif // not HAVE_LOCALTIME_R
+#ifndef HAVE_SNPRINTF
+int snprintf(char *str, size_t size, const char *format, ...) {
+  va_list ap;
+  va_start(ap, format);
+  const int r = vsnprintf(str, size, format, ap);
+  va_end(ap);
+  return r;
+}
+#endif
diff --git a/src/windows/port.h b/src/windows/port.h
new file mode 100755
index 000000000000..7b4b9c8545b8
--- /dev/null
+++ b/src/windows/port.h
@@ -0,0 +1,174 @@
+/* Copyright (c) 2008, Google Inc.
+ * All rights reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * 
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * ---
+ * Author: Craig Silverstein
+ * Copied from google-perftools and modified by Shinichiro Hamaji
+ *
+ * These are some portability typedefs and defines to make it a bit
+ * easier to compile this code under VC++.
+ *
+ * Several of these are taken from glib:
+ *    http://developer.gnome.org/doc/API/glib/glib-windows-compatability-functions.html
+ */
+
+#ifndef CTEMPLATE_WINDOWS_PORT_H_
+#define CTEMPLATE_WINDOWS_PORT_H_
+
+#include "config.h"
+
+#ifdef _WIN32
+
+#ifndef WIN32_LEAN_AND_MEAN
+#define WIN32_LEAN_AND_MEAN  /* We always want minimal includes */
+#endif
+
+#include <windows.h>
+#include <winsock.h>         /* for gethostname */
+#include <io.h>              /* because we so often use open/close/etc */
+#include <direct.h>          /* for _getcwd() */
+#include <process.h>         /* for _getpid() */
+#include <stdio.h>           /* read in vsnprintf decl. before redifining it */
+#include <stdarg.h>          /* template_dictionary.cc uses va_copy */
+#include <string.h>          /* for _strnicmp(), strerror_s() */
+#include <time.h>            /* for localtime_s() */
+/* Note: the C++ #includes are all together at the bottom.  This file is
+ * used by both C and C++ code, so we put all the C++ together.
+ */
+
+#ifdef _MSC_VER
+
+/* 4244: otherwise we get problems when substracting two size_t's to an int
+ * 4251: it's complaining about a private struct I've chosen not to dllexport
+ * 4355: we use this in a constructor, but we do it safely
+ * 4715: for some reason VC++ stopped realizing you can't return after abort()
+ * 4800: we know we're casting ints/char*'s to bools, and we're ok with that
+ * 4996: Yes, we're ok using "unsafe" functions like fopen() and strerror()
+ * 4312: Converting uint32_t to a pointer when testing %p
+ * 4267: also subtracting two size_t to int
+ * 4722: Destructor never returns due to abort()
+ */
+#pragma warning(disable:4244 4251 4355 4715 4800 4996 4267 4312 4722)
+
+/* file I/O */
+#define PATH_MAX 1024
+#define access  _access
+#define getcwd  _getcwd
+#define open    _open
+#define read    _read
+#define write   _write
+#define lseek   _lseek
+#define close   _close
+#define popen   _popen
+#define pclose  _pclose
+#define R_OK    04           /* read-only (for access()) */
+#define S_ISDIR(m)  (((m) & _S_IFMT) == _S_IFDIR)
+
+#define O_WRONLY _O_WRONLY
+#define O_CREAT _O_CREAT
+#define O_EXCL _O_EXCL
+
+#ifndef __MINGW32__
+enum { STDIN_FILENO = 0, STDOUT_FILENO = 1, STDERR_FILENO = 2 };
+#endif
+#define S_IRUSR S_IREAD
+#define S_IWUSR S_IWRITE
+
+/* Not quite as lightweight as a hard-link, but more than good enough for us. */
+#define link(oldpath, newpath)  CopyFileA(oldpath, newpath, false)
+
+#define strcasecmp   _stricmp
+#define strncasecmp  _strnicmp
+
+/* In windows-land, hash<> is called hash_compare<> (from xhash.h) */
+/* VC11 provides std::hash */
+#if defined(_MSC_VER) && (_MSC_VER < 1700)
+#define hash  hash_compare
+#endif
+
+/* Sleep is in ms, on windows */
+#define sleep(secs)  Sleep((secs) * 1000)
+
+/* We can't just use _vsnprintf and _snprintf as drop-in-replacements,
+ * because they don't always NUL-terminate. :-(  We also can't use the
+ * name vsnprintf, since windows defines that (but not snprintf (!)).
+ */
+#ifndef HAVE_SNPRINTF
+extern int GOOGLE_GLOG_DLL_DECL snprintf(char *str, size_t size,
+                                       const char *format, ...);
+#endif
+extern int GOOGLE_GLOG_DLL_DECL safe_vsnprintf(char *str, size_t size,
+                          const char *format, va_list ap);
+#define vsnprintf(str, size, format, ap)  safe_vsnprintf(str, size, format, ap)
+#ifndef va_copy
+#define va_copy(dst, src)  (dst) = (src)
+#endif
+
+/* Windows doesn't support specifying the number of buckets as a
+ * hash_map constructor arg, so we leave this blank.
+ */
+#define CTEMPLATE_SMALL_HASHTABLE
+
+#define DEFAULT_TEMPLATE_ROOTDIR  ".."
+
+// ----------------------------------- SYSTEM/PROCESS
+typedef int pid_t;
+#define getpid  _getpid
+
+#endif  // _MSC_VER
+
+// ----------------------------------- THREADS
+#if defined(HAVE_PTHREAD)
+# include <pthread.h>
+#else // no PTHREAD
+typedef DWORD pthread_t;
+typedef DWORD pthread_key_t;
+typedef LONG pthread_once_t;
+enum { PTHREAD_ONCE_INIT = 0 };   // important that this be 0! for SpinLock
+#define pthread_self  GetCurrentThreadId
+#define pthread_equal(pthread_t_1, pthread_t_2)  ((pthread_t_1)==(pthread_t_2))
+#endif // HAVE_PTHREAD
+
+#ifndef HAVE_LOCALTIME_R
+extern GOOGLE_GLOG_DLL_DECL struct tm* localtime_r(const time_t* timep, struct tm* result);
+#endif // not HAVE_LOCALTIME_R
+
+inline char* strerror_r(int errnum, char* buf, size_t buflen) {
+  strerror_s(buf, buflen, errnum);
+  return buf;
+}
+
+#ifndef __cplusplus
+/* I don't see how to get inlining for C code in MSVC.  Ah well. */
+#define inline
+#endif
+
+#endif  /* _WIN32 */
+
+#endif  /* CTEMPLATE_WINDOWS_PORT_H_ */
diff --git a/src/windows/preprocess.sh b/src/windows/preprocess.sh
new file mode 100755
index 000000000000..c35e92913b65
--- /dev/null
+++ b/src/windows/preprocess.sh
@@ -0,0 +1,119 @@
+#!/bin/sh
+
+# Copyright (c) 2008, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+# ---
+# Author: Craig Silverstein
+# Copied from google-perftools and modified by Shinichiro Hamaji
+#
+# This script is meant to be run at distribution-generation time, for
+# instance by autogen.sh.  It does some of the work configure would
+# normally do, for windows systems.  In particular, it expands all the
+# @...@ variables found in .in files, and puts them here, in the windows
+# directory.
+#
+# This script should be run before any new release.
+
+if [ -z "$1" ]; then
+   echo "USAGE: $0 <src/ directory>"
+   exit 1
+fi
+
+DLLDEF_MACRO_NAME="GLOG_DLL_DECL"
+
+# The text we put in every .h files we create.  As a courtesy, we'll
+# include a helpful comment for windows users as to how to use
+# GLOG_DLL_DECL.  Apparently sed expands \n into a newline.  Good!
+DLLDEF_DEFINES="\
+// NOTE: if you are statically linking the template library into your binary\n\
+// (rather than using the template .dll), set '/D $DLLDEF_MACRO_NAME='\n\
+// as a compiler flag in your project file to turn off the dllimports.\n\
+#ifndef $DLLDEF_MACRO_NAME\n\
+# define $DLLDEF_MACRO_NAME  __declspec(dllimport)\n\
+#endif"
+
+# Read all the windows config info into variables
+# In order for the 'set' to take, this requires putting all in a subshell.
+(
+  while read define varname value; do
+    [ "$define" != "#define" ] && continue
+    eval "$varname='$value'"
+  done
+
+  # Process all the .in files in the "glog" subdirectory
+  mkdir -p "$1/windows/glog"
+  for file in `echo "$1"/glog/*.in`; do
+     echo "Processing $file"
+     outfile="$1/windows/glog/`basename $file .in`"
+
+     echo "\
+// This file is automatically generated from $file
+// using src/windows/preprocess.sh.
+// DO NOT EDIT!
+" > "$outfile"
+     # Besides replacing @...@, we also need to turn on dllimport
+     # We also need to replace hash by hash_compare (annoying we hard-code :-( )
+     sed -e "s!@ac_windows_dllexport@!$DLLDEF_MACRO_NAME!g" \
+         -e "s!@ac_windows_dllexport_defines@!$DLLDEF_DEFINES!g" \
+         -e "s!@ac_cv_cxx_hash_map@!$HASH_MAP_H!g" \
+         -e "s!@ac_cv_cxx_hash_namespace@!$HASH_NAMESPACE!g" \
+         -e "s!@ac_cv_cxx_hash_set@!$HASH_SET_H!g" \
+         -e "s!@ac_cv_have_stdint_h@!0!g" \
+         -e "s!@ac_cv_have_systypes_h@!0!g" \
+         -e "s!@ac_cv_have_inttypes_h@!0!g" \
+         -e "s!@ac_cv_have_unistd_h@!0!g" \
+         -e "s!@ac_cv_have_uint16_t@!0!g" \
+         -e "s!@ac_cv_have_u_int16_t@!0!g" \
+         -e "s!@ac_cv_have___uint16@!1!g" \
+         -e "s!@ac_cv_have_libgflags@!0!g" \
+         -e "s!@ac_cv_have___builtin_expect@!0!g" \
+         -e "s!@ac_cv_cxx_using_operator@!1!g" \
+         -e "s!@ac_cv___attribute___noreturn@!__declspec(noreturn)!g" \
+         -e "s!@ac_cv___attribute___noinline@!!g" \
+         -e "s!@ac_cv___attribute___printf_4_5@!!g" \
+         -e "s!@ac_google_attribute@!${HAVE___ATTRIBUTE__:-0}!g" \
+         -e "s!@ac_google_end_namespace@!$_END_GOOGLE_NAMESPACE_!g" \
+         -e "s!@ac_google_namespace@!$GOOGLE_NAMESPACE!g" \
+         -e "s!@ac_google_start_namespace@!$_START_GOOGLE_NAMESPACE_!g" \
+         -e "s!@ac_htmlparser_namespace@!$HTMLPARSER_NAMESPACE!g" \
+         -e "s!\\bhash\\b!hash_compare!g" \
+         "$file" >> "$outfile"
+  done
+) < "$1/windows/config.h"
+
+# log_severity.h isn't a .in file.
+echo "\
+// This file is automatically generated from $1/glog/log_severity.h
+// using src/windows/preprocess.sh.
+// DO NOT EDIT!
+" > "$1/windows/glog/log_severity.h"
+cat "$1/glog/log_severity.h" >> "$1/windows/glog/log_severity.h"
+
+echo "DONE"