diff options
| author | Vincent Ambo <mail@tazj.in> | 2022-02-07T23·05+0300 |
|---|---|---|
| committer | clbot <clbot@tvl.fyi> | 2022-02-07T23·09+0000 |
| commit | 5aa5d282eac56a21e74611c1cdbaa97bb5db2dca (patch) | |
| tree | 8cc5dce8157a1470ff76719dd15d65f648a05522 /third_party/abseil_cpp/absl/debugging | |
| parent | a25675804c4f429fab5ee5201fe25e89865dfd13 (diff) | |
chore(3p/abseil_cpp): unvendor abseil_cpp r/3786
we weren't actually using these sources anymore, okay? Change-Id: If701571d9716de308d3512e1eb22c35db0877a66 Reviewed-on: https://cl.tvl.fyi/c/depot/+/5248 Tested-by: BuildkiteCI Reviewed-by: grfn <grfn@gws.fyi> Autosubmit: tazjin <tazjin@tvl.su>
Diffstat (limited to 'third_party/abseil_cpp/absl/debugging')
42 files changed, 0 insertions, 9582 deletions
diff --git a/third_party/abseil_cpp/absl/debugging/BUILD.bazel b/third_party/abseil_cpp/absl/debugging/BUILD.bazel deleted file mode 100644 index cd6e45439657..000000000000 --- a/third_party/abseil_cpp/absl/debugging/BUILD.bazel +++ /dev/null @@ -1,347 +0,0 @@ -# -# Copyright 2017 The Abseil Authors. -# -# Licensed under the Apache License, Version 2.0 (the "License"); -# you may not use this file except in compliance with the License. -# You may obtain a copy of the License at -# -# https://www.apache.org/licenses/LICENSE-2.0 -# -# Unless required by applicable law or agreed to in writing, software -# distributed under the License is distributed on an "AS IS" BASIS, -# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -# See the License for the specific language governing permissions and -# limitations under the License. -# - -load("@rules_cc//cc:defs.bzl", "cc_library", "cc_test") -load( - "//absl:copts/configure_copts.bzl", - "ABSL_DEFAULT_COPTS", - "ABSL_DEFAULT_LINKOPTS", - "ABSL_TEST_COPTS", -) - -package( - default_visibility = ["//visibility:public"], -) - -licenses(["notice"]) - -cc_library( - name = "stacktrace", - srcs = [ - "internal/stacktrace_aarch64-inl.inc", - "internal/stacktrace_arm-inl.inc", - "internal/stacktrace_config.h", - "internal/stacktrace_generic-inl.inc", - "internal/stacktrace_powerpc-inl.inc", - "internal/stacktrace_unimplemented-inl.inc", - "internal/stacktrace_win32-inl.inc", - "internal/stacktrace_x86-inl.inc", - "stacktrace.cc", - ], - hdrs = ["stacktrace.h"], - copts = ABSL_DEFAULT_COPTS, - linkopts = ABSL_DEFAULT_LINKOPTS, - deps = [ - ":debugging_internal", - "//absl/base:config", - "//absl/base:core_headers", - ], -) - -cc_library( - name = "symbolize", - srcs = [ - "symbolize.cc", - "symbolize_darwin.inc", - "symbolize_elf.inc", - "symbolize_unimplemented.inc", - "symbolize_win32.inc", - ], - hdrs = [ - "internal/symbolize.h", - "symbolize.h", - ], - copts = ABSL_DEFAULT_COPTS, - linkopts = ABSL_DEFAULT_LINKOPTS + select({ - "//absl:windows": ["-DEFAULTLIB:dbghelp.lib"], - "//conditions:default": [], - }), - deps = [ - ":debugging_internal", - ":demangle_internal", - "//absl/base", - "//absl/base:config", - "//absl/base:core_headers", - "//absl/base:dynamic_annotations", - "//absl/base:malloc_internal", - "//absl/base:raw_logging_internal", - "//absl/strings", - ], -) - -cc_test( - name = "symbolize_test", - srcs = ["symbolize_test.cc"], - copts = ABSL_TEST_COPTS + select({ - "//absl:windows": ["/Z7"], - "//conditions:default": [], - }), - linkopts = ABSL_DEFAULT_LINKOPTS + select({ - "//absl:windows": ["/DEBUG"], - "//conditions:default": [], - }), - deps = [ - ":stack_consumption", - ":symbolize", - "//absl/base", - "//absl/base:config", - "//absl/base:core_headers", - "//absl/base:raw_logging_internal", - "//absl/memory", - "//absl/strings", - "@com_google_googletest//:gtest", - ], -) - -cc_library( - name = "examine_stack", - srcs = [ - "internal/examine_stack.cc", - ], - hdrs = [ - "internal/examine_stack.h", - ], - copts = ABSL_DEFAULT_COPTS, - linkopts = ABSL_DEFAULT_LINKOPTS, - visibility = ["//visibility:private"], - deps = [ - ":stacktrace", - ":symbolize", - "//absl/base:config", - "//absl/base:core_headers", - "//absl/base:raw_logging_internal", - ], -) - -cc_library( - name = "failure_signal_handler", - srcs = ["failure_signal_handler.cc"], - hdrs = ["failure_signal_handler.h"], - copts = ABSL_DEFAULT_COPTS, - linkopts = ABSL_DEFAULT_LINKOPTS, - deps = [ - ":examine_stack", - ":stacktrace", - "//absl/base", - "//absl/base:config", - "//absl/base:core_headers", - "//absl/base:errno_saver", - "//absl/base:raw_logging_internal", - ], -) - -cc_test( - name = "failure_signal_handler_test", - srcs = ["failure_signal_handler_test.cc"], - copts = ABSL_TEST_COPTS, - linkopts = select({ - "//absl:windows": [], - "//absl:wasm": [], - "//conditions:default": ["-pthread"], - }) + ABSL_DEFAULT_LINKOPTS, - deps = [ - ":failure_signal_handler", - ":stacktrace", - ":symbolize", - "//absl/base:raw_logging_internal", - "//absl/strings", - "@com_google_googletest//:gtest", - ], -) - -cc_library( - name = "debugging_internal", - srcs = [ - "internal/address_is_readable.cc", - "internal/elf_mem_image.cc", - "internal/vdso_support.cc", - ], - hdrs = [ - "internal/address_is_readable.h", - "internal/elf_mem_image.h", - "internal/vdso_support.h", - ], - copts = ABSL_DEFAULT_COPTS, - linkopts = ABSL_DEFAULT_LINKOPTS, - deps = [ - "//absl/base:config", - "//absl/base:core_headers", - "//absl/base:dynamic_annotations", - "//absl/base:errno_saver", - "//absl/base:raw_logging_internal", - ], -) - -cc_library( - name = "demangle_internal", - srcs = ["internal/demangle.cc"], - hdrs = ["internal/demangle.h"], - copts = ABSL_DEFAULT_COPTS, - deps = [ - "//absl/base", - "//absl/base:config", - "//absl/base:core_headers", - ], -) - -cc_test( - name = "demangle_test", - srcs = ["internal/demangle_test.cc"], - copts = ABSL_TEST_COPTS, - linkopts = ABSL_DEFAULT_LINKOPTS, - deps = [ - ":demangle_internal", - ":stack_consumption", - "//absl/base:config", - "//absl/base:core_headers", - "//absl/base:raw_logging_internal", - "//absl/memory", - "@com_google_googletest//:gtest_main", - ], -) - -cc_library( - name = "leak_check", - srcs = ["leak_check.cc"], - hdrs = ["leak_check.h"], - linkopts = ABSL_DEFAULT_LINKOPTS, - deps = [ - "//absl/base:config", - "//absl/base:core_headers", - ], -) - -# Adding a dependency to leak_check_disable will disable -# sanitizer leak checking (asan/lsan) in a test without -# the need to mess around with build features. -cc_library( - name = "leak_check_disable", - srcs = ["leak_check_disable.cc"], - linkopts = ABSL_DEFAULT_LINKOPTS, - linkstatic = 1, - deps = ["//absl/base:config"], - alwayslink = 1, -) - -# These targets exists for use in tests only, explicitly configuring the -# LEAK_SANITIZER macro. It must be linked with -fsanitize=leak for lsan. -ABSL_LSAN_LINKOPTS = select({ - "//absl:clang_compiler": ["-fsanitize=leak"], - "//conditions:default": [], -}) - -cc_library( - name = "leak_check_api_enabled_for_testing", - testonly = 1, - srcs = ["leak_check.cc"], - hdrs = ["leak_check.h"], - copts = select({ - "//absl:clang_compiler": ["-DLEAK_SANITIZER"], - "//conditions:default": [], - }), - linkopts = ABSL_DEFAULT_LINKOPTS, - visibility = ["//visibility:private"], - deps = [ - "//absl/base:config", - ], -) - -cc_library( - name = "leak_check_api_disabled_for_testing", - testonly = 1, - srcs = ["leak_check.cc"], - hdrs = ["leak_check.h"], - copts = ["-ULEAK_SANITIZER"], - linkopts = ABSL_DEFAULT_LINKOPTS, - visibility = ["//visibility:private"], - deps = [ - "//absl/base:config", - ], -) - -cc_test( - name = "leak_check_test", - srcs = ["leak_check_test.cc"], - copts = select({ - "//absl:clang_compiler": ["-DABSL_EXPECT_LEAK_SANITIZER"], - "//conditions:default": [], - }), - linkopts = ABSL_LSAN_LINKOPTS + ABSL_DEFAULT_LINKOPTS, - tags = ["notsan"], - deps = [ - ":leak_check_api_enabled_for_testing", - "//absl/base", - "@com_google_googletest//:gtest_main", - ], -) - -cc_test( - name = "leak_check_no_lsan_test", - srcs = ["leak_check_test.cc"], - copts = ["-UABSL_EXPECT_LEAK_SANITIZER"], - linkopts = ABSL_DEFAULT_LINKOPTS, - tags = ["noasan"], - deps = [ - ":leak_check_api_disabled_for_testing", - "//absl/base", # for raw_logging - "@com_google_googletest//:gtest_main", - ], -) - -# Test that leak checking is skipped when lsan is enabled but -# ":leak_check_disable" is linked in. -# -# This test should fail in the absence of a dependency on ":leak_check_disable" -cc_test( - name = "disabled_leak_check_test", - srcs = ["leak_check_fail_test.cc"], - linkopts = ABSL_LSAN_LINKOPTS + ABSL_DEFAULT_LINKOPTS, - tags = ["notsan"], - deps = [ - ":leak_check_api_enabled_for_testing", - ":leak_check_disable", - "//absl/base", - "@com_google_googletest//:gtest_main", - ], -) - -cc_library( - name = "stack_consumption", - testonly = 1, - srcs = ["internal/stack_consumption.cc"], - hdrs = ["internal/stack_consumption.h"], - copts = ABSL_DEFAULT_COPTS, - linkopts = ABSL_DEFAULT_LINKOPTS, - visibility = ["//visibility:private"], - deps = [ - "//absl/base:config", - "//absl/base:core_headers", - "//absl/base:raw_logging_internal", - ], -) - -cc_test( - name = "stack_consumption_test", - srcs = ["internal/stack_consumption_test.cc"], - copts = ABSL_TEST_COPTS, - linkopts = ABSL_DEFAULT_LINKOPTS, - deps = [ - ":stack_consumption", - "//absl/base:core_headers", - "//absl/base:raw_logging_internal", - "@com_google_googletest//:gtest_main", - ], -) diff --git a/third_party/abseil_cpp/absl/debugging/CMakeLists.txt b/third_party/abseil_cpp/absl/debugging/CMakeLists.txt deleted file mode 100644 index 074b44cf1781..000000000000 --- a/third_party/abseil_cpp/absl/debugging/CMakeLists.txt +++ /dev/null @@ -1,338 +0,0 @@ -# -# Copyright 2017 The Abseil Authors. -# -# Licensed under the Apache License, Version 2.0 (the "License"); -# you may not use this file except in compliance with the License. -# You may obtain a copy of the License at -# -# https://www.apache.org/licenses/LICENSE-2.0 -# -# Unless required by applicable law or agreed to in writing, software -# distributed under the License is distributed on an "AS IS" BASIS, -# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -# See the License for the specific language governing permissions and -# limitations under the License. -# - -absl_cc_library( - NAME - stacktrace - HDRS - "stacktrace.h" - "internal/stacktrace_aarch64-inl.inc" - "internal/stacktrace_arm-inl.inc" - "internal/stacktrace_config.h" - "internal/stacktrace_generic-inl.inc" - "internal/stacktrace_powerpc-inl.inc" - "internal/stacktrace_unimplemented-inl.inc" - "internal/stacktrace_win32-inl.inc" - "internal/stacktrace_x86-inl.inc" - SRCS - "stacktrace.cc" - COPTS - ${ABSL_DEFAULT_COPTS} - DEPS - absl::debugging_internal - absl::config - absl::core_headers - PUBLIC -) - -absl_cc_library( - NAME - symbolize - HDRS - "symbolize.h" - "internal/symbolize.h" - SRCS - "symbolize.cc" - "symbolize_darwin.inc" - "symbolize_elf.inc" - "symbolize_unimplemented.inc" - "symbolize_win32.inc" - COPTS - ${ABSL_DEFAULT_COPTS} - LINKOPTS - ${ABSL_DEFAULT_LINKOPTS} - $<$<BOOL:${MINGW}>:"dbghelp"> - DEPS - absl::debugging_internal - absl::demangle_internal - absl::base - absl::config - absl::core_headers - absl::dynamic_annotations - absl::malloc_internal - absl::raw_logging_internal - absl::strings - PUBLIC -) - -absl_cc_test( - NAME - symbolize_test - SRCS - "symbolize_test.cc" - COPTS - ${ABSL_TEST_COPTS} - $<$<BOOL:${MSVC}>:-Z7> - LINKOPTS - $<$<BOOL:${MSVC}>:-DEBUG> - DEPS - absl::stack_consumption - absl::symbolize - absl::base - absl::config - absl::core_headers - absl::memory - absl::raw_logging_internal - absl::strings - gmock -) - -absl_cc_library( - NAME - examine_stack - HDRS - "internal/examine_stack.h" - SRCS - "internal/examine_stack.cc" - COPTS - ${ABSL_DEFAULT_COPTS} - DEPS - absl::stacktrace - absl::symbolize - absl::config - absl::core_headers - absl::raw_logging_internal -) - -absl_cc_library( - NAME - failure_signal_handler - HDRS - "failure_signal_handler.h" - SRCS - "failure_signal_handler.cc" - COPTS - ${ABSL_DEFAULT_COPTS} - DEPS - absl::examine_stack - absl::stacktrace - absl::base - absl::config - absl::core_headers - absl::errno_saver - absl::raw_logging_internal - PUBLIC -) - -absl_cc_test( - NAME - failure_signal_handler_test - SRCS - "failure_signal_handler_test.cc" - COPTS - ${ABSL_TEST_COPTS} - DEPS - absl::failure_signal_handler - absl::stacktrace - absl::symbolize - absl::strings - absl::raw_logging_internal - Threads::Threads - gmock -) - -absl_cc_library( - NAME - debugging_internal - HDRS - "internal/address_is_readable.h" - "internal/elf_mem_image.h" - "internal/vdso_support.h" - SRCS - "internal/address_is_readable.cc" - "internal/elf_mem_image.cc" - "internal/vdso_support.cc" - COPTS - ${ABSL_DEFAULT_COPTS} - DEPS - absl::core_headers - absl::config - absl::dynamic_annotations - absl::errno_saver - absl::raw_logging_internal -) - -absl_cc_library( - NAME - demangle_internal - HDRS - "internal/demangle.h" - SRCS - "internal/demangle.cc" - COPTS - ${ABSL_DEFAULT_COPTS} - DEPS - absl::base - absl::core_headers - PUBLIC -) - -absl_cc_test( - NAME - demangle_test - SRCS - "internal/demangle_test.cc" - COPTS - ${ABSL_TEST_COPTS} - DEPS - absl::demangle_internal - absl::stack_consumption - absl::config - absl::core_headers - absl::memory - absl::raw_logging_internal - gmock_main -) - -absl_cc_library( - NAME - leak_check - HDRS - "leak_check.h" - SRCS - "leak_check.cc" - COPTS - ${ABSL_DEFAULT_COPTS} - DEPS - absl::config - absl::core_headers - PUBLIC -) - -absl_cc_library( - NAME - leak_check_disable - SRCS - "leak_check_disable.cc" - COPTS - ${ABSL_DEFAULT_COPTS} - PUBLIC -) - -absl_cc_library( - NAME - leak_check_api_enabled_for_testing - HDRS - "leak_check.h" - SRCS - "leak_check.cc" - COPTS - ${ABSL_DEFAULT_COPTS} - $<$<BOOL:${ABSL_HAVE_LSAN}>:-DLEAK_SANITIZER> - TESTONLY -) - -absl_cc_library( - NAME - leak_check_api_disabled_for_testing - HDRS - "leak_check.h" - SRCS - "leak_check.cc" - COPTS - ${ABSL_DEFAULT_COPTS} - "-ULEAK_SANITIZER" - TESTONLY -) - -absl_cc_test( - NAME - leak_check_test - SRCS - "leak_check_test.cc" - COPTS - ${ABSL_TEST_COPTS} - "$<$<BOOL:${ABSL_HAVE_LSAN}>:-DABSL_EXPECT_LEAK_SANITIZER>" - LINKOPTS - "${ABSL_LSAN_LINKOPTS}" - DEPS - absl::leak_check_api_enabled_for_testing - absl::base - gmock_main -) - -absl_cc_test( - NAME - leak_check_no_lsan_test - SRCS - "leak_check_test.cc" - COPTS - ${ABSL_TEST_COPTS} - "-UABSL_EXPECT_LEAK_SANITIZER" - DEPS - absl::leak_check_api_disabled_for_testing - absl::base - gmock_main -) - -absl_cc_test( - NAME - disabled_leak_check_test - SRCS - "leak_check_fail_test.cc" - COPTS - ${ABSL_TEST_COPTS} - LINKOPTS - "${ABSL_LSAN_LINKOPTS}" - DEPS - absl::leak_check_api_enabled_for_testing - absl::leak_check_disable - absl::base - absl::raw_logging_internal - gmock_main -) - -absl_cc_library( - NAME - stack_consumption - HDRS - "internal/stack_consumption.h" - SRCS - "internal/stack_consumption.cc" - COPTS - ${ABSL_DEFAULT_COPTS} - DEPS - absl::config - absl::core_headers - absl::raw_logging_internal - TESTONLY -) - -absl_cc_test( - NAME - stack_consumption_test - SRCS - "internal/stack_consumption_test.cc" - COPTS - ${ABSL_TEST_COPTS} - DEPS - absl::stack_consumption - absl::core_headers - absl::raw_logging_internal - gmock_main -) - -# component target -absl_cc_library( - NAME - debugging - COPTS - ${ABSL_DEFAULT_COPTS} - DEPS - absl::stacktrace - absl::leak_check - PUBLIC -) diff --git a/third_party/abseil_cpp/absl/debugging/failure_signal_handler.cc b/third_party/abseil_cpp/absl/debugging/failure_signal_handler.cc deleted file mode 100644 index 5d13bdbbbd13..000000000000 --- a/third_party/abseil_cpp/absl/debugging/failure_signal_handler.cc +++ /dev/null @@ -1,370 +0,0 @@ -// -// Copyright 2018 The Abseil Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// https://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. -// - -#include "absl/debugging/failure_signal_handler.h" - -#include "absl/base/config.h" - -#ifdef _WIN32 -#include <windows.h> -#else -#include <unistd.h> -#endif - -#ifdef __APPLE__ -#include <TargetConditionals.h> -#endif - -#ifdef ABSL_HAVE_MMAP -#include <sys/mman.h> -#endif - -#include <algorithm> -#include <atomic> -#include <cerrno> -#include <csignal> -#include <cstdio> -#include <cstring> -#include <ctime> - -#include "absl/base/attributes.h" -#include "absl/base/internal/errno_saver.h" -#include "absl/base/internal/raw_logging.h" -#include "absl/base/internal/sysinfo.h" -#include "absl/debugging/internal/examine_stack.h" -#include "absl/debugging/stacktrace.h" - -#ifndef _WIN32 -#define ABSL_HAVE_SIGACTION -// Apple WatchOS and TVOS don't allow sigaltstack -#if !(defined(TARGET_OS_WATCH) && TARGET_OS_WATCH) && \ - !(defined(TARGET_OS_TV) && TARGET_OS_TV) -#define ABSL_HAVE_SIGALTSTACK -#endif -#endif - -namespace absl { -ABSL_NAMESPACE_BEGIN - -ABSL_CONST_INIT static FailureSignalHandlerOptions fsh_options; - -// Resets the signal handler for signo to the default action for that -// signal, then raises the signal. -static void RaiseToDefaultHandler(int signo) { - signal(signo, SIG_DFL); - raise(signo); -} - -struct FailureSignalData { - const int signo; - const char* const as_string; -#ifdef ABSL_HAVE_SIGACTION - struct sigaction previous_action; - // StructSigaction is used to silence -Wmissing-field-initializers. - using StructSigaction = struct sigaction; - #define FSD_PREVIOUS_INIT FailureSignalData::StructSigaction() -#else - void (*previous_handler)(int); - #define FSD_PREVIOUS_INIT SIG_DFL -#endif -}; - -ABSL_CONST_INIT static FailureSignalData failure_signal_data[] = { - {SIGSEGV, "SIGSEGV", FSD_PREVIOUS_INIT}, - {SIGILL, "SIGILL", FSD_PREVIOUS_INIT}, - {SIGFPE, "SIGFPE", FSD_PREVIOUS_INIT}, - {SIGABRT, "SIGABRT", FSD_PREVIOUS_INIT}, - {SIGTERM, "SIGTERM", FSD_PREVIOUS_INIT}, -#ifndef _WIN32 - {SIGBUS, "SIGBUS", FSD_PREVIOUS_INIT}, - {SIGTRAP, "SIGTRAP", FSD_PREVIOUS_INIT}, -#endif -}; - -#undef FSD_PREVIOUS_INIT - -static void RaiseToPreviousHandler(int signo) { - // Search for the previous handler. - for (const auto& it : failure_signal_data) { - if (it.signo == signo) { -#ifdef ABSL_HAVE_SIGACTION - sigaction(signo, &it.previous_action, nullptr); -#else - signal(signo, it.previous_handler); -#endif - raise(signo); - return; - } - } - - // Not found, use the default handler. - RaiseToDefaultHandler(signo); -} - -namespace debugging_internal { - -const char* FailureSignalToString(int signo) { - for (const auto& it : failure_signal_data) { - if (it.signo == signo) { - return it.as_string; - } - } - return ""; -} - -} // namespace debugging_internal - -#ifdef ABSL_HAVE_SIGALTSTACK - -static bool SetupAlternateStackOnce() { -#if defined(__wasm__) || defined (__asjms__) - const size_t page_mask = getpagesize() - 1; -#else - const size_t page_mask = sysconf(_SC_PAGESIZE) - 1; -#endif - size_t stack_size = (std::max(SIGSTKSZ, 65536) + page_mask) & ~page_mask; -#if defined(ABSL_HAVE_ADDRESS_SANITIZER) || \ - defined(ABSL_HAVE_MEMORY_SANITIZER) || defined(ABSL_HAVE_THREAD_SANITIZER) - // Account for sanitizer instrumentation requiring additional stack space. - stack_size *= 5; -#endif - - stack_t sigstk; - memset(&sigstk, 0, sizeof(sigstk)); - sigstk.ss_size = stack_size; - -#ifdef ABSL_HAVE_MMAP -#ifndef MAP_STACK -#define MAP_STACK 0 -#endif -#if defined(MAP_ANON) && !defined(MAP_ANONYMOUS) -#define MAP_ANONYMOUS MAP_ANON -#endif - sigstk.ss_sp = mmap(nullptr, sigstk.ss_size, PROT_READ | PROT_WRITE, - MAP_PRIVATE | MAP_ANONYMOUS | MAP_STACK, -1, 0); - if (sigstk.ss_sp == MAP_FAILED) { - ABSL_RAW_LOG(FATAL, "mmap() for alternate signal stack failed"); - } -#else - sigstk.ss_sp = malloc(sigstk.ss_size); - if (sigstk.ss_sp == nullptr) { - ABSL_RAW_LOG(FATAL, "malloc() for alternate signal stack failed"); - } -#endif - - if (sigaltstack(&sigstk, nullptr) != 0) { - ABSL_RAW_LOG(FATAL, "sigaltstack() failed with errno=%d", errno); - } - return true; -} - -#endif - -#ifdef ABSL_HAVE_SIGACTION - -// Sets up an alternate stack for signal handlers once. -// Returns the appropriate flag for sig_action.sa_flags -// if the system supports using an alternate stack. -static int MaybeSetupAlternateStack() { -#ifdef ABSL_HAVE_SIGALTSTACK - ABSL_ATTRIBUTE_UNUSED static const bool kOnce = SetupAlternateStackOnce(); - return SA_ONSTACK; -#else - return 0; -#endif -} - -static void InstallOneFailureHandler(FailureSignalData* data, - void (*handler)(int, siginfo_t*, void*)) { - struct sigaction act; - memset(&act, 0, sizeof(act)); - sigemptyset(&act.sa_mask); - act.sa_flags |= SA_SIGINFO; - // SA_NODEFER is required to handle SIGABRT from - // ImmediateAbortSignalHandler(). - act.sa_flags |= SA_NODEFER; - if (fsh_options.use_alternate_stack) { - act.sa_flags |= MaybeSetupAlternateStack(); - } - act.sa_sigaction = handler; - ABSL_RAW_CHECK(sigaction(data->signo, &act, &data->previous_action) == 0, - "sigaction() failed"); -} - -#else - -static void InstallOneFailureHandler(FailureSignalData* data, - void (*handler)(int)) { - data->previous_handler = signal(data->signo, handler); - ABSL_RAW_CHECK(data->previous_handler != SIG_ERR, "signal() failed"); -} - -#endif - -static void WriteToStderr(const char* data) { - absl::base_internal::ErrnoSaver errno_saver; - absl::raw_logging_internal::SafeWriteToStderr(data, strlen(data)); -} - -static void WriteSignalMessage(int signo, void (*writerfn)(const char*)) { - char buf[64]; - const char* const signal_string = - debugging_internal::FailureSignalToString(signo); - if (signal_string != nullptr && signal_string[0] != '\0') { - snprintf(buf, sizeof(buf), "*** %s received at time=%ld ***\n", - signal_string, - static_cast<long>(time(nullptr))); // NOLINT(runtime/int) - } else { - snprintf(buf, sizeof(buf), "*** Signal %d received at time=%ld ***\n", - signo, static_cast<long>(time(nullptr))); // NOLINT(runtime/int) - } - writerfn(buf); -} - -// `void*` might not be big enough to store `void(*)(const char*)`. -struct WriterFnStruct { - void (*writerfn)(const char*); -}; - -// Many of the absl::debugging_internal::Dump* functions in -// examine_stack.h take a writer function pointer that has a void* arg -// for historical reasons. failure_signal_handler_writer only takes a -// data pointer. This function converts between these types. -static void WriterFnWrapper(const char* data, void* arg) { - static_cast<WriterFnStruct*>(arg)->writerfn(data); -} - -// Convenient wrapper around DumpPCAndFrameSizesAndStackTrace() for signal -// handlers. "noinline" so that GetStackFrames() skips the top-most stack -// frame for this function. -ABSL_ATTRIBUTE_NOINLINE static void WriteStackTrace( - void* ucontext, bool symbolize_stacktrace, - void (*writerfn)(const char*, void*), void* writerfn_arg) { - constexpr int kNumStackFrames = 32; - void* stack[kNumStackFrames]; - int frame_sizes[kNumStackFrames]; - int min_dropped_frames; - int depth = absl::GetStackFramesWithContext( - stack, frame_sizes, kNumStackFrames, - 1, // Do not include this function in stack trace. - ucontext, &min_dropped_frames); - absl::debugging_internal::DumpPCAndFrameSizesAndStackTrace( - absl::debugging_internal::GetProgramCounter(ucontext), stack, frame_sizes, - depth, min_dropped_frames, symbolize_stacktrace, writerfn, writerfn_arg); -} - -// Called by AbslFailureSignalHandler() to write the failure info. It is -// called once with writerfn set to WriteToStderr() and then possibly -// with writerfn set to the user provided function. -static void WriteFailureInfo(int signo, void* ucontext, - void (*writerfn)(const char*)) { - WriterFnStruct writerfn_struct{writerfn}; - WriteSignalMessage(signo, writerfn); - WriteStackTrace(ucontext, fsh_options.symbolize_stacktrace, WriterFnWrapper, - &writerfn_struct); -} - -// absl::SleepFor() can't be used here since AbslInternalSleepFor() -// may be overridden to do something that isn't async-signal-safe on -// some platforms. -static void PortableSleepForSeconds(int seconds) { -#ifdef _WIN32 - Sleep(seconds * 1000); -#else - struct timespec sleep_time; - sleep_time.tv_sec = seconds; - sleep_time.tv_nsec = 0; - while (nanosleep(&sleep_time, &sleep_time) != 0 && errno == EINTR) {} -#endif -} - -#ifdef ABSL_HAVE_ALARM -// AbslFailureSignalHandler() installs this as a signal handler for -// SIGALRM, then sets an alarm to be delivered to the program after a -// set amount of time. If AbslFailureSignalHandler() hangs for more than -// the alarm timeout, ImmediateAbortSignalHandler() will abort the -// program. -static void ImmediateAbortSignalHandler(int) { - RaiseToDefaultHandler(SIGABRT); -} -#endif - -// absl::base_internal::GetTID() returns pid_t on most platforms, but -// returns absl::base_internal::pid_t on Windows. -using GetTidType = decltype(absl::base_internal::GetTID()); -ABSL_CONST_INIT static std::atomic<GetTidType> failed_tid(0); - -#ifndef ABSL_HAVE_SIGACTION -static void AbslFailureSignalHandler(int signo) { - void* ucontext = nullptr; -#else -static void AbslFailureSignalHandler(int signo, siginfo_t*, void* ucontext) { -#endif - - const GetTidType this_tid = absl::base_internal::GetTID(); - GetTidType previous_failed_tid = 0; - if (!failed_tid.compare_exchange_strong( - previous_failed_tid, static_cast<intptr_t>(this_tid), - std::memory_order_acq_rel, std::memory_order_relaxed)) { - ABSL_RAW_LOG( - ERROR, - "Signal %d raised at PC=%p while already in AbslFailureSignalHandler()", - signo, absl::debugging_internal::GetProgramCounter(ucontext)); - if (this_tid != previous_failed_tid) { - // Another thread is already in AbslFailureSignalHandler(), so wait - // a bit for it to finish. If the other thread doesn't kill us, - // we do so after sleeping. - PortableSleepForSeconds(3); - RaiseToDefaultHandler(signo); - // The recursively raised signal may be blocked until we return. - return; - } - } - -#ifdef ABSL_HAVE_ALARM - // Set an alarm to abort the program in case this code hangs or deadlocks. - if (fsh_options.alarm_on_failure_secs > 0) { - alarm(0); // Cancel any existing alarms. - signal(SIGALRM, ImmediateAbortSignalHandler); - alarm(fsh_options.alarm_on_failure_secs); - } -#endif - - // First write to stderr. - WriteFailureInfo(signo, ucontext, WriteToStderr); - - // Riskier code (because it is less likely to be async-signal-safe) - // goes after this point. - if (fsh_options.writerfn != nullptr) { - WriteFailureInfo(signo, ucontext, fsh_options.writerfn); - } - - if (fsh_options.call_previous_handler) { - RaiseToPreviousHandler(signo); - } else { - RaiseToDefaultHandler(signo); - } -} - -void InstallFailureSignalHandler(const FailureSignalHandlerOptions& options) { - fsh_options = options; - for (auto& it : failure_signal_data) { - InstallOneFailureHandler(&it, AbslFailureSignalHandler); - } -} - -ABSL_NAMESPACE_END -} // namespace absl diff --git a/third_party/abseil_cpp/absl/debugging/failure_signal_handler.h b/third_party/abseil_cpp/absl/debugging/failure_signal_handler.h deleted file mode 100644 index 0c0f585d0fb4..000000000000 --- a/third_party/abseil_cpp/absl/debugging/failure_signal_handler.h +++ /dev/null @@ -1,121 +0,0 @@ -// Copyright 2018 The Abseil Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// https://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. -// -// ----------------------------------------------------------------------------- -// File: failure_signal_handler.h -// ----------------------------------------------------------------------------- -// -// This file configures the Abseil *failure signal handler* to capture and dump -// useful debugging information (such as a stacktrace) upon program failure. -// -// To use the failure signal handler, call `absl::InstallFailureSignalHandler()` -// very early in your program, usually in the first few lines of main(): -// -// int main(int argc, char** argv) { -// // Initialize the symbolizer to get a human-readable stack trace -// absl::InitializeSymbolizer(argv[0]); -// -// absl::FailureSignalHandlerOptions options; -// absl::InstallFailureSignalHandler(options); -// DoSomethingInteresting(); -// return 0; -// } -// -// Any program that raises a fatal signal (such as `SIGSEGV`, `SIGILL`, -// `SIGFPE`, `SIGABRT`, `SIGTERM`, `SIGBUG`, and `SIGTRAP`) will call the -// installed failure signal handler and provide debugging information to stderr. -// -// Note that you should *not* install the Abseil failure signal handler more -// than once. You may, of course, have another (non-Abseil) failure signal -// handler installed (which would be triggered if Abseil's failure signal -// handler sets `call_previous_handler` to `true`). - -#ifndef ABSL_DEBUGGING_FAILURE_SIGNAL_HANDLER_H_ -#define ABSL_DEBUGGING_FAILURE_SIGNAL_HANDLER_H_ - -#include "absl/base/config.h" - -namespace absl { -ABSL_NAMESPACE_BEGIN - -// FailureSignalHandlerOptions -// -// Struct for holding `absl::InstallFailureSignalHandler()` configuration -// options. -struct FailureSignalHandlerOptions { - // If true, try to symbolize the stacktrace emitted on failure, provided that - // you have initialized a symbolizer for that purpose. (See symbolize.h for - // more information.) - bool symbolize_stacktrace = true; - - // If true, try to run signal handlers on an alternate stack (if supported on - // the given platform). An alternate stack is useful for program crashes due - // to a stack overflow; by running on a alternate stack, the signal handler - // may run even when normal stack space has been exausted. The downside of - // using an alternate stack is that extra memory for the alternate stack needs - // to be pre-allocated. - bool use_alternate_stack = true; - - // If positive, indicates the number of seconds after which the failure signal - // handler is invoked to abort the program. Setting such an alarm is useful in - // cases where the failure signal handler itself may become hung or - // deadlocked. - int alarm_on_failure_secs = 3; - - // If true, call the previously registered signal handler for the signal that - // was received (if one was registered) after the existing signal handler - // runs. This mechanism can be used to chain signal handlers together. - // - // If false, the signal is raised to the default handler for that signal - // (which normally terminates the program). - // - // IMPORTANT: If true, the chained fatal signal handlers must not try to - // recover from the fatal signal. Instead, they should terminate the program - // via some mechanism, like raising the default handler for the signal, or by - // calling `_exit()`. Note that the failure signal handler may put parts of - // the Abseil library into a state from which they cannot recover. - bool call_previous_handler = false; - - // If non-null, indicates a pointer to a callback function that will be called - // upon failure, with a string argument containing failure data. This function - // may be used as a hook to write failure data to a secondary location, such - // as a log file. This function may also be called with null data, as a hint - // to flush any buffered data before the program may be terminated. Consider - // flushing any buffered data in all calls to this function. - // - // Since this function runs within a signal handler, it should be - // async-signal-safe if possible. - // See http://man7.org/linux/man-pages/man7/signal-safety.7.html - void (*writerfn)(const char*) = nullptr; -}; - -// InstallFailureSignalHandler() -// -// Installs a signal handler for the common failure signals `SIGSEGV`, `SIGILL`, -// `SIGFPE`, `SIGABRT`, `SIGTERM`, `SIGBUG`, and `SIGTRAP` (provided they exist -// on the given platform). The failure signal handler dumps program failure data -// useful for debugging in an unspecified format to stderr. This data may -// include the program counter, a stacktrace, and register information on some -// systems; do not rely on an exact format for the output, as it is subject to -// change. -void InstallFailureSignalHandler(const FailureSignalHandlerOptions& options); - -namespace debugging_internal { -const char* FailureSignalToString(int signo); -} // namespace debugging_internal - -ABSL_NAMESPACE_END -} // namespace absl - -#endif // ABSL_DEBUGGING_FAILURE_SIGNAL_HANDLER_H_ diff --git a/third_party/abseil_cpp/absl/debugging/failure_signal_handler_test.cc b/third_party/abseil_cpp/absl/debugging/failure_signal_handler_test.cc deleted file mode 100644 index d8283b2f47cd..000000000000 --- a/third_party/abseil_cpp/absl/debugging/failure_signal_handler_test.cc +++ /dev/null @@ -1,159 +0,0 @@ -// -// Copyright 2018 The Abseil Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// https://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. -// - -#include "absl/debugging/failure_signal_handler.h" - -#include <csignal> -#include <cstdio> -#include <cstdlib> -#include <cstring> -#include <fstream> - -#include "gtest/gtest.h" -#include "gmock/gmock.h" -#include "absl/base/internal/raw_logging.h" -#include "absl/debugging/stacktrace.h" -#include "absl/debugging/symbolize.h" -#include "absl/strings/match.h" -#include "absl/strings/str_cat.h" - -namespace { - -using testing::StartsWith; - -#if GTEST_HAS_DEATH_TEST - -// For the parameterized death tests. GetParam() returns the signal number. -using FailureSignalHandlerDeathTest = ::testing::TestWithParam<int>; - -// This function runs in a fork()ed process on most systems. -void InstallHandlerAndRaise(int signo) { - absl::InstallFailureSignalHandler(absl::FailureSignalHandlerOptions()); - raise(signo); -} - -TEST_P(FailureSignalHandlerDeathTest, AbslFailureSignal) { - const int signo = GetParam(); - std::string exit_regex = absl::StrCat( - "\\*\\*\\* ", absl::debugging_internal::FailureSignalToString(signo), - " received at time="); -#ifndef _WIN32 - EXPECT_EXIT(InstallHandlerAndRaise(signo), testing::KilledBySignal(signo), - exit_regex); -#else - // Windows doesn't have testing::KilledBySignal(). - EXPECT_DEATH_IF_SUPPORTED(InstallHandlerAndRaise(signo), exit_regex); -#endif -} - -ABSL_CONST_INIT FILE* error_file = nullptr; - -void WriteToErrorFile(const char* msg) { - if (msg != nullptr) { - ABSL_RAW_CHECK(fwrite(msg, strlen(msg), 1, error_file) == 1, - "fwrite() failed"); - } - ABSL_RAW_CHECK(fflush(error_file) == 0, "fflush() failed"); -} - -std::string GetTmpDir() { - // TEST_TMPDIR is set by Bazel. Try the others when not running under Bazel. - static const char* const kTmpEnvVars[] = {"TEST_TMPDIR", "TMPDIR", "TEMP", - "TEMPDIR", "TMP"}; - for (const char* const var : kTmpEnvVars) { - const char* tmp_dir = std::getenv(var); - if (tmp_dir != nullptr) { - return tmp_dir; - } - } - - // Try something reasonable. - return "/tmp"; -} - -// This function runs in a fork()ed process on most systems. -void InstallHandlerWithWriteToFileAndRaise(const char* file, int signo) { - error_file = fopen(file, "w"); - ABSL_RAW_CHECK(error_file != nullptr, "Failed create error_file"); - absl::FailureSignalHandlerOptions options; - options.writerfn = WriteToErrorFile; - absl::InstallFailureSignalHandler(options); - raise(signo); -} - -TEST_P(FailureSignalHandlerDeathTest, AbslFatalSignalsWithWriterFn) { - const int signo = GetParam(); - std::string tmp_dir = GetTmpDir(); - std::string file = absl::StrCat(tmp_dir, "/signo_", signo); - - std::string exit_regex = absl::StrCat( - "\\*\\*\\* ", absl::debugging_internal::FailureSignalToString(signo), - " received at time="); -#ifndef _WIN32 - EXPECT_EXIT(InstallHandlerWithWriteToFileAndRaise(file.c_str(), signo), - testing::KilledBySignal(signo), exit_regex); -#else - // Windows doesn't have testing::KilledBySignal(). - EXPECT_DEATH_IF_SUPPORTED( - InstallHandlerWithWriteToFileAndRaise(file.c_str(), signo), exit_regex); -#endif - - // Open the file in this process and check its contents. - std::fstream error_output(file); - ASSERT_TRUE(error_output.is_open()) << file; - std::string error_line; - std::getline(error_output, error_line); - EXPECT_THAT( - error_line, - StartsWith(absl::StrCat( - "*** ", absl::debugging_internal::FailureSignalToString(signo), - " received at "))); - - if (absl::debugging_internal::StackTraceWorksForTest()) { - std::getline(error_output, error_line); - EXPECT_THAT(error_line, StartsWith("PC: ")); - } -} - -constexpr int kFailureSignals[] = { - SIGSEGV, SIGILL, SIGFPE, SIGABRT, SIGTERM, -#ifndef _WIN32 - SIGBUS, SIGTRAP, -#endif -}; - -std::string SignalParamToString(const ::testing::TestParamInfo<int>& info) { - std::string result = - absl::debugging_internal::FailureSignalToString(info.param); - if (result.empty()) { - result = absl::StrCat(info.param); - } - return result; -} - -INSTANTIATE_TEST_SUITE_P(AbslDeathTest, FailureSignalHandlerDeathTest, - ::testing::ValuesIn(kFailureSignals), - SignalParamToString); - -#endif // GTEST_HAS_DEATH_TEST - -} // namespace - -int main(int argc, char** argv) { - absl::InitializeSymbolizer(argv[0]); - testing::InitGoogleTest(&argc, argv); - return RUN_ALL_TESTS(); -} diff --git a/third_party/abseil_cpp/absl/debugging/internal/address_is_readable.cc b/third_party/abseil_cpp/absl/debugging/internal/address_is_readable.cc deleted file mode 100644 index 329c285f3b58..000000000000 --- a/third_party/abseil_cpp/absl/debugging/internal/address_is_readable.cc +++ /dev/null @@ -1,139 +0,0 @@ -// Copyright 2017 The Abseil Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// https://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -// base::AddressIsReadable() probes an address to see whether it is readable, -// without faulting. - -#include "absl/debugging/internal/address_is_readable.h" - -#if !defined(__linux__) || defined(__ANDROID__) - -namespace absl { -ABSL_NAMESPACE_BEGIN -namespace debugging_internal { - -// On platforms other than Linux, just return true. -bool AddressIsReadable(const void* /* addr */) { return true; } - -} // namespace debugging_internal -ABSL_NAMESPACE_END -} // namespace absl - -#else - -#include <fcntl.h> -#include <sys/syscall.h> -#include <unistd.h> - -#include <atomic> -#include <cerrno> -#include <cstdint> - -#include "absl/base/internal/errno_saver.h" -#include "absl/base/internal/raw_logging.h" - -namespace absl { -ABSL_NAMESPACE_BEGIN -namespace debugging_internal { - -// Pack a pid and two file descriptors into a 64-bit word, -// using 16, 24, and 24 bits for each respectively. -static uint64_t Pack(uint64_t pid, uint64_t read_fd, uint64_t write_fd) { - ABSL_RAW_CHECK((read_fd >> 24) == 0 && (write_fd >> 24) == 0, - "fd out of range"); - return (pid << 48) | ((read_fd & 0xffffff) << 24) | (write_fd & 0xffffff); -} - -// Unpack x into a pid and two file descriptors, where x was created with -// Pack(). -static void Unpack(uint64_t x, int *pid, int *read_fd, int *write_fd) { - *pid = x >> 48; - *read_fd = (x >> 24) & 0xffffff; - *write_fd = x & 0xffffff; -} - -// Return whether the byte at *addr is readable, without faulting. -// Save and restores errno. Returns true on systems where -// unimplemented. -// This is a namespace-scoped variable for correct zero-initialization. -static std::atomic<uint64_t> pid_and_fds; // initially 0, an invalid pid. - -bool AddressIsReadable(const void *addr) { - absl::base_internal::ErrnoSaver errno_saver; - // We test whether a byte is readable by using write(). Normally, this would - // be done via a cached file descriptor to /dev/null, but linux fails to - // check whether the byte is readable when the destination is /dev/null, so - // we use a cached pipe. We store the pid of the process that created the - // pipe to handle the case where a process forks, and the child closes all - // the file descriptors and then calls this routine. This is not perfect: - // the child could use the routine, then close all file descriptors and then - // use this routine again. But the likely use of this routine is when - // crashing, to test the validity of pages when dumping the stack. Beware - // that we may leak file descriptors, but we're unlikely to leak many. - int bytes_written; - int current_pid = getpid() & 0xffff; // we use only the low order 16 bits - do { // until we do not get EBADF trying to use file descriptors - int pid; - int read_fd; - int write_fd; - uint64_t local_pid_and_fds = pid_and_fds.load(std::memory_order_acquire); - Unpack(local_pid_and_fds, &pid, &read_fd, &write_fd); - while (current_pid != pid) { - int p[2]; - // new pipe - if (pipe(p) != 0) { - ABSL_RAW_LOG(FATAL, "Failed to create pipe, errno=%d", errno); - } - fcntl(p[0], F_SETFD, FD_CLOEXEC); - fcntl(p[1], F_SETFD, FD_CLOEXEC); - uint64_t new_pid_and_fds = Pack(current_pid, p[0], p[1]); - if (pid_and_fds.compare_exchange_strong( - local_pid_and_fds, new_pid_and_fds, std::memory_order_release, - std::memory_order_relaxed)) { - local_pid_and_fds = new_pid_and_fds; // fds exposed to other threads - } else { // fds not exposed to other threads; we can close them. - close(p[0]); - close(p[1]); - local_pid_and_fds = pid_and_fds.load(std::memory_order_acquire); - } - Unpack(local_pid_and_fds, &pid, &read_fd, &write_fd); - } - errno = 0; - // Use syscall(SYS_write, ...) instead of write() to prevent ASAN - // and other checkers from complaining about accesses to arbitrary - // memory. - do { - bytes_written = syscall(SYS_write, write_fd, addr, 1); - } while (bytes_written == -1 && errno == EINTR); - if (bytes_written == 1) { // remove the byte from the pipe - char c; - while (read(read_fd, &c, 1) == -1 && errno == EINTR) { - } - } - if (errno == EBADF) { // Descriptors invalid. - // If pid_and_fds contains the problematic file descriptors we just used, - // this call will forget them, and the loop will try again. - pid_and_fds.compare_exchange_strong(local_pid_and_fds, 0, - std::memory_order_release, - std::memory_order_relaxed); - } - } while (errno == EBADF); - return bytes_written == 1; -} - -} // namespace debugging_internal -ABSL_NAMESPACE_END -} // namespace absl - -#endif diff --git a/third_party/abseil_cpp/absl/debugging/internal/address_is_readable.h b/third_party/abseil_cpp/absl/debugging/internal/address_is_readable.h deleted file mode 100644 index 4bbaf4d69bd8..000000000000 --- a/third_party/abseil_cpp/absl/debugging/internal/address_is_readable.h +++ /dev/null @@ -1,32 +0,0 @@ -// Copyright 2017 The Abseil Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// https://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -#ifndef ABSL_DEBUGGING_INTERNAL_ADDRESS_IS_READABLE_H_ -#define ABSL_DEBUGGING_INTERNAL_ADDRESS_IS_READABLE_H_ - -#include "absl/base/config.h" - -namespace absl { -ABSL_NAMESPACE_BEGIN -namespace debugging_internal { - -// Return whether the byte at *addr is readable, without faulting. -// Save and restores errno. -bool AddressIsReadable(const void *addr); - -} // namespace debugging_internal -ABSL_NAMESPACE_END -} // namespace absl - -#endif // ABSL_DEBUGGING_INTERNAL_ADDRESS_IS_READABLE_H_ diff --git a/third_party/abseil_cpp/absl/debugging/internal/demangle.cc b/third_party/abseil_cpp/absl/debugging/internal/demangle.cc deleted file mode 100644 index 46cdb67b1fbf..000000000000 --- a/third_party/abseil_cpp/absl/debugging/internal/demangle.cc +++ /dev/null @@ -1,1945 +0,0 @@ -// Copyright 2018 The Abseil Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// https://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -// For reference check out: -// https://itanium-cxx-abi.github.io/cxx-abi/abi.html#mangling -// -// Note that we only have partial C++11 support yet. - -#include "absl/debugging/internal/demangle.h" - -#include <cstdint> -#include <cstdio> -#include <limits> - -namespace absl { -ABSL_NAMESPACE_BEGIN -namespace debugging_internal { - -typedef struct { - const char *abbrev; - const char *real_name; - // Number of arguments in <expression> context, or 0 if disallowed. - int arity; -} AbbrevPair; - -// List of operators from Itanium C++ ABI. -static const AbbrevPair kOperatorList[] = { - // New has special syntax (not currently supported). - {"nw", "new", 0}, - {"na", "new[]", 0}, - - // Works except that the 'gs' prefix is not supported. - {"dl", "delete", 1}, - {"da", "delete[]", 1}, - - {"ps", "+", 1}, // "positive" - {"ng", "-", 1}, // "negative" - {"ad", "&", 1}, // "address-of" - {"de", "*", 1}, // "dereference" - {"co", "~", 1}, - - {"pl", "+", 2}, - {"mi", "-", 2}, - {"ml", "*", 2}, - {"dv", "/", 2}, - {"rm", "%", 2}, - {"an", "&", 2}, - {"or", "|", 2}, - {"eo", "^", 2}, - {"aS", "=", 2}, - {"pL", "+=", 2}, - {"mI", "-=", 2}, - {"mL", "*=", 2}, - {"dV", "/=", 2}, - {"rM", "%=", 2}, - {"aN", "&=", 2}, - {"oR", "|=", 2}, - {"eO", "^=", 2}, - {"ls", "<<", 2}, - {"rs", ">>", 2}, - {"lS", "<<=", 2}, - {"rS", ">>=", 2}, - {"eq", "==", 2}, - {"ne", "!=", 2}, - {"lt", "<", 2}, - {"gt", ">", 2}, - {"le", "<=", 2}, - {"ge", ">=", 2}, - {"nt", "!", 1}, - {"aa", "&&", 2}, - {"oo", "||", 2}, - {"pp", "++", 1}, - {"mm", "--", 1}, - {"cm", ",", 2}, - {"pm", "->*", 2}, - {"pt", "->", 0}, // Special syntax - {"cl", "()", 0}, // Special syntax - {"ix", "[]", 2}, - {"qu", "?", 3}, - {"st", "sizeof", 0}, // Special syntax - {"sz", "sizeof", 1}, // Not a real operator name, but used in expressions. - {nullptr, nullptr, 0}, -}; - -// List of builtin types from Itanium C++ ABI. -// -// Invariant: only one- or two-character type abbreviations here. -static const AbbrevPair kBuiltinTypeList[] = { - {"v", "void", 0}, - {"w", "wchar_t", 0}, - {"b", "bool", 0}, - {"c", "char", 0}, - {"a", "signed char", 0}, - {"h", "unsigned char", 0}, - {"s", "short", 0}, - {"t", "unsigned short", 0}, - {"i", "int", 0}, - {"j", "unsigned int", 0}, - {"l", "long", 0}, - {"m", "unsigned long", 0}, - {"x", "long long", 0}, - {"y", "unsigned long long", 0}, - {"n", "__int128", 0}, - {"o", "unsigned __int128", 0}, - {"f", "float", 0}, - {"d", "double", 0}, - {"e", "long double", 0}, - {"g", "__float128", 0}, - {"z", "ellipsis", 0}, - - {"De", "decimal128", 0}, // IEEE 754r decimal floating point (128 bits) - {"Dd", "decimal64", 0}, // IEEE 754r decimal floating point (64 bits) - {"Dc", "decltype(auto)", 0}, - {"Da", "auto", 0}, - {"Dn", "std::nullptr_t", 0}, // i.e., decltype(nullptr) - {"Df", "decimal32", 0}, // IEEE 754r decimal floating point (32 bits) - {"Di", "char32_t", 0}, - {"Du", "char8_t", 0}, - {"Ds", "char16_t", 0}, - {"Dh", "float16", 0}, // IEEE 754r half-precision float (16 bits) - {nullptr, nullptr, 0}, -}; - -// List of substitutions Itanium C++ ABI. -static const AbbrevPair kSubstitutionList[] = { - {"St", "", 0}, - {"Sa", "allocator", 0}, - {"Sb", "basic_string", 0}, - // std::basic_string<char, std::char_traits<char>,std::allocator<char> > - {"Ss", "string", 0}, - // std::basic_istream<char, std::char_traits<char> > - {"Si", "istream", 0}, - // std::basic_ostream<char, std::char_traits<char> > - {"So", "ostream", 0}, - // std::basic_iostream<char, std::char_traits<char> > - {"Sd", "iostream", 0}, - {nullptr, nullptr, 0}, -}; - -// State needed for demangling. This struct is copied in almost every stack -// frame, so every byte counts. -typedef struct { - int mangled_idx; // Cursor of mangled name. - int out_cur_idx; // Cursor of output string. - int prev_name_idx; // For constructors/destructors. - signed int prev_name_length : 16; // For constructors/destructors. - signed int nest_level : 15; // For nested names. - unsigned int append : 1; // Append flag. - // Note: for some reason MSVC can't pack "bool append : 1" into the same int - // with the above two fields, so we use an int instead. Amusingly it can pack - // "signed bool" as expected, but relying on that to continue to be a legal - // type seems ill-advised (as it's illegal in at least clang). -} ParseState; - -static_assert(sizeof(ParseState) == 4 * sizeof(int), - "unexpected size of ParseState"); - -// One-off state for demangling that's not subject to backtracking -- either -// constant data, data that's intentionally immune to backtracking (steps), or -// data that would never be changed by backtracking anyway (recursion_depth). -// -// Only one copy of this exists for each call to Demangle, so the size of this -// struct is nearly inconsequential. -typedef struct { - const char *mangled_begin; // Beginning of input string. - char *out; // Beginning of output string. - int out_end_idx; // One past last allowed output character. - int recursion_depth; // For stack exhaustion prevention. - int steps; // Cap how much work we'll do, regardless of depth. - ParseState parse_state; // Backtrackable state copied for most frames. -} State; - -namespace { -// Prevent deep recursion / stack exhaustion. -// Also prevent unbounded handling of complex inputs. -class ComplexityGuard { - public: - explicit ComplexityGuard(State *state) : state_(state) { - ++state->recursion_depth; - ++state->steps; - } - ~ComplexityGuard() { --state_->recursion_depth; } - - // 256 levels of recursion seems like a reasonable upper limit on depth. - // 128 is not enough to demagle synthetic tests from demangle_unittest.txt: - // "_ZaaZZZZ..." and "_ZaaZcvZcvZ..." - static constexpr int kRecursionDepthLimit = 256; - - // We're trying to pick a charitable upper-limit on how many parse steps are - // necessary to handle something that a human could actually make use of. - // This is mostly in place as a bound on how much work we'll do if we are - // asked to demangle an mangled name from an untrusted source, so it should be - // much larger than the largest expected symbol, but much smaller than the - // amount of work we can do in, e.g., a second. - // - // Some real-world symbols from an arbitrary binary started failing between - // 2^12 and 2^13, so we multiply the latter by an extra factor of 16 to set - // the limit. - // - // Spending one second on 2^17 parse steps would require each step to take - // 7.6us, or ~30000 clock cycles, so it's safe to say this can be done in - // under a second. - static constexpr int kParseStepsLimit = 1 << 17; - - bool IsTooComplex() const { - return state_->recursion_depth > kRecursionDepthLimit || - state_->steps > kParseStepsLimit; - } - - private: - State *state_; -}; -} // namespace - -// 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_begin = mangled; - state->out = out; - state->out_end_idx = out_size; - state->recursion_depth = 0; - state->steps = 0; - - state->parse_state.mangled_idx = 0; - state->parse_state.out_cur_idx = 0; - state->parse_state.prev_name_idx = 0; - state->parse_state.prev_name_length = -1; - state->parse_state.nest_level = -1; - state->parse_state.append = true; -} - -static inline const char *RemainingInput(State *state) { - return &state->mangled_begin[state->parse_state.mangled_idx]; -} - -// Returns true and advances "mangled_idx" if we find "one_char_token" -// at "mangled_idx" position. It is assumed that "one_char_token" does -// not contain '\0'. -static bool ParseOneCharToken(State *state, const char one_char_token) { - ComplexityGuard guard(state); - if (guard.IsTooComplex()) return false; - if (RemainingInput(state)[0] == one_char_token) { - ++state->parse_state.mangled_idx; - 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) { - ComplexityGuard guard(state); - if (guard.IsTooComplex()) return false; - if (RemainingInput(state)[0] == two_char_token[0] && - RemainingInput(state)[1] == two_char_token[1]) { - state->parse_state.mangled_idx += 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) { - ComplexityGuard guard(state); - if (guard.IsTooComplex()) return false; - if (RemainingInput(state)[0] == '\0') { - return false; - } - const char *p = char_class; - for (; *p != '\0'; ++p) { - if (RemainingInput(state)[0] == *p) { - ++state->parse_state.mangled_idx; - return true; - } - } - return false; -} - -static bool ParseDigit(State *state, int *digit) { - char c = RemainingInput(state)[0]; - if (ParseCharClass(state, "0123456789")) { - if (digit != nullptr) { - *digit = c - '0'; - } - return true; - } - return false; -} - -// This function is used for handling an optional non-terminal. -static bool Optional(bool /*status*/) { 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_idx". If there is an overflow, out_cur_idx is -// set to out_end_idx+1. 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) { - for (int i = 0; i < length; ++i) { - if (state->parse_state.out_cur_idx + 1 < - state->out_end_idx) { // +1 for '\0' - state->out[state->parse_state.out_cur_idx++] = str[i]; - } else { - // signal overflow - state->parse_state.out_cur_idx = state->out_end_idx + 1; - break; - } - } - if (state->parse_state.out_cur_idx < state->out_end_idx) { - state->out[state->parse_state.out_cur_idx] = - '\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 (and our locally-modified version of GCC -// 4.4.x) 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". -} - -static bool EndsWith(State *state, const char chr) { - return state->parse_state.out_cur_idx > 0 && - state->parse_state.out_cur_idx < state->out_end_idx && - chr == state->out[state->parse_state.out_cur_idx - 1]; -} - -// Append "str" with some tweaks, iff "append" state is true. -static void MaybeAppendWithLength(State *state, const char *const str, - const int length) { - if (state->parse_state.append && length > 0) { - // Append a space if the output buffer ends with '<' and "str" - // starts with '<' to avoid <<<. - if (str[0] == '<' && EndsWith(state, '<')) { - Append(state, " ", 1); - } - // Remember the last identifier name for ctors/dtors, - // but only if we haven't yet overflown the buffer. - if (state->parse_state.out_cur_idx < state->out_end_idx && - (IsAlpha(str[0]) || str[0] == '_')) { - state->parse_state.prev_name_idx = state->parse_state.out_cur_idx; - state->parse_state.prev_name_length = length; - } - Append(state, str, length); - } -} - -// Appends a positive decimal number to the output if appending is enabled. -static bool MaybeAppendDecimal(State *state, unsigned int val) { - // Max {32-64}-bit unsigned int is 20 digits. - constexpr size_t kMaxLength = 20; - char buf[kMaxLength]; - - // We can't use itoa or sprintf as neither is specified to be - // async-signal-safe. - if (state->parse_state.append) { - // We can't have a one-before-the-beginning pointer, so instead start with - // one-past-the-end and manipulate one character before the pointer. - char *p = &buf[kMaxLength]; - do { // val=0 is the only input that should write a leading zero digit. - *--p = (val % 10) + '0'; - val /= 10; - } while (p > buf && val != 0); - - // 'p' landed on the last character we set. How convenient. - Append(state, p, kMaxLength - (p - buf)); - } - - return true; -} - -// A convenient wrapper around MaybeAppendWithLength(). -// Returns true so that it can be placed in "if" conditions. -static bool MaybeAppend(State *state, const char *const str) { - if (state->parse_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->parse_state.nest_level = 0; - return true; -} - -// This function is used for handling nested names. -static bool LeaveNestedName(State *state, int16_t prev_value) { - state->parse_state.nest_level = prev_value; - return true; -} - -// Disable the append mode not to print function parameters, etc. -static bool DisableAppend(State *state) { - state->parse_state.append = false; - return true; -} - -// Restore the append mode to the previous state. -static bool RestoreAppend(State *state, bool prev_value) { - state->parse_state.append = prev_value; - return true; -} - -// Increase the nest level for nested names. -static void MaybeIncreaseNestLevel(State *state) { - if (state->parse_state.nest_level > -1) { - ++state->parse_state.nest_level; - } -} - -// Appends :: for nested names if necessary. -static void MaybeAppendSeparator(State *state) { - if (state->parse_state.nest_level >= 1) { - MaybeAppend(state, "::"); - } -} - -// Cancel the last separator if necessary. -static void MaybeCancelLastSeparator(State *state) { - if (state->parse_state.nest_level >= 1 && state->parse_state.append && - state->parse_state.out_cur_idx >= 2) { - state->parse_state.out_cur_idx -= 2; - state->out[state->parse_state.out_cur_idx] = '\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) { - // Returns true if "anon_prefix" is a proper prefix of "mangled_cur". - static const char anon_prefix[] = "_GLOBAL__N_"; - return (length > static_cast<int>(sizeof(anon_prefix) - 1) && - StrPrefix(RemainingInput(state), 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 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 ParseUnnamedTypeName(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 ParseOperatorName(State *state, int *arity); -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 ParseDecltype(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 ParseBaseUnresolvedName(State *state); -static bool ParseUnresolvedName(State *state); -static bool ParseExpression(State *state); -static bool ParseExprPrimary(State *state); -static bool ParseExprCastValue(State *state); -static bool ParseLocalName(State *state); -static bool ParseLocalNameSuffix(State *state); -static bool ParseDiscriminator(State *state); -static bool ParseSubstitution(State *state, bool accept_std); - -// 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 parse state and returns true on -// success, or returns false and doesn't change the parse state (note: -// the parse-steps counter increases regardless of success or failure). -// To ensure that the parse state isn't changed in the latter case, we -// save the original state before we call multiple parsing functions -// consecutively with &&, and restore it 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 -// <https://mentorembedded.github.io/cxx-abi/abi.html#mangling> - -// <mangled-name> ::= _Z <encoding> -static bool ParseMangledName(State *state) { - ComplexityGuard guard(state); - if (guard.IsTooComplex()) return false; - return ParseTwoCharToken(state, "_Z") && ParseEncoding(state); -} - -// <encoding> ::= <(function) name> <bare-function-type> -// ::= <(data) name> -// ::= <special-name> -static bool ParseEncoding(State *state) { - ComplexityGuard guard(state); - if (guard.IsTooComplex()) return false; - // Implementing the first two productions together as <name> - // [<bare-function-type>] avoids exponential blowup of backtracking. - // - // Since Optional(...) can't fail, there's no need to copy the state for - // backtracking. - if (ParseName(state) && Optional(ParseBareFunctionType(state))) { - return true; - } - - if (ParseSpecialName(state)) { - return true; - } - return false; -} - -// <name> ::= <nested-name> -// ::= <unscoped-template-name> <template-args> -// ::= <unscoped-name> -// ::= <local-name> -static bool ParseName(State *state) { - ComplexityGuard guard(state); - if (guard.IsTooComplex()) return false; - if (ParseNestedName(state) || ParseLocalName(state)) { - return true; - } - - // We reorganize the productions to avoid re-parsing unscoped names. - // - Inline <unscoped-template-name> productions: - // <name> ::= <substitution> <template-args> - // ::= <unscoped-name> <template-args> - // ::= <unscoped-name> - // - Merge the two productions that start with unscoped-name: - // <name> ::= <unscoped-name> [<template-args>] - - ParseState copy = state->parse_state; - // "std<...>" isn't a valid name. - if (ParseSubstitution(state, /*accept_std=*/false) && - ParseTemplateArgs(state)) { - return true; - } - state->parse_state = copy; - - // Note there's no need to restore state after this since only the first - // subparser can fail. - return ParseUnscopedName(state) && Optional(ParseTemplateArgs(state)); -} - -// <unscoped-name> ::= <unqualified-name> -// ::= St <unqualified-name> -static bool ParseUnscopedName(State *state) { - ComplexityGuard guard(state); - if (guard.IsTooComplex()) return false; - if (ParseUnqualifiedName(state)) { - return true; - } - - ParseState copy = state->parse_state; - if (ParseTwoCharToken(state, "St") && MaybeAppend(state, "std::") && - ParseUnqualifiedName(state)) { - return true; - } - state->parse_state = copy; - return false; -} - -// <ref-qualifer> ::= R // lvalue method reference qualifier -// ::= O // rvalue method reference qualifier -static inline bool ParseRefQualifier(State *state) { - return ParseCharClass(state, "OR"); -} - -// <nested-name> ::= N [<CV-qualifiers>] [<ref-qualifier>] <prefix> -// <unqualified-name> E -// ::= N [<CV-qualifiers>] [<ref-qualifier>] <template-prefix> -// <template-args> E -static bool ParseNestedName(State *state) { - ComplexityGuard guard(state); - if (guard.IsTooComplex()) return false; - ParseState copy = state->parse_state; - if (ParseOneCharToken(state, 'N') && EnterNestedName(state) && - Optional(ParseCVQualifiers(state)) && - Optional(ParseRefQualifier(state)) && ParsePrefix(state) && - LeaveNestedName(state, copy.nest_level) && - ParseOneCharToken(state, 'E')) { - return true; - } - state->parse_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) { - ComplexityGuard guard(state); - if (guard.IsTooComplex()) return false; - bool has_something = false; - while (true) { - MaybeAppendSeparator(state); - if (ParseTemplateParam(state) || - ParseSubstitution(state, /*accept_std=*/true) || - ParseUnscopedName(state) || - (ParseOneCharToken(state, 'M') && ParseUnnamedTypeName(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> -// ::= <local-source-name> // GCC extension; see below. -// ::= <unnamed-type-name> -static bool ParseUnqualifiedName(State *state) { - ComplexityGuard guard(state); - if (guard.IsTooComplex()) return false; - return (ParseOperatorName(state, nullptr) || ParseCtorDtorName(state) || - ParseSourceName(state) || ParseLocalSourceName(state) || - ParseUnnamedTypeName(state)); -} - -// <source-name> ::= <positive length number> <identifier> -static bool ParseSourceName(State *state) { - ComplexityGuard guard(state); - if (guard.IsTooComplex()) return false; - ParseState copy = state->parse_state; - int length = -1; - if (ParseNumber(state, &length) && ParseIdentifier(state, length)) { - return true; - } - state->parse_state = copy; - return false; -} - -// <local-source-name> ::= L <source-name> [<discriminator>] -// -// References: -// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=31775 -// https://gcc.gnu.org/viewcvs?view=rev&revision=124467 -static bool ParseLocalSourceName(State *state) { - ComplexityGuard guard(state); - if (guard.IsTooComplex()) return false; - ParseState copy = state->parse_state; - if (ParseOneCharToken(state, 'L') && ParseSourceName(state) && - Optional(ParseDiscriminator(state))) { - return true; - } - state->parse_state = copy; - return false; -} - -// <unnamed-type-name> ::= Ut [<(nonnegative) number>] _ -// ::= <closure-type-name> -// <closure-type-name> ::= Ul <lambda-sig> E [<(nonnegative) number>] _ -// <lambda-sig> ::= <(parameter) type>+ -static bool ParseUnnamedTypeName(State *state) { - ComplexityGuard guard(state); - if (guard.IsTooComplex()) return false; - ParseState copy = state->parse_state; - // Type's 1-based index n is encoded as { "", n == 1; itoa(n-2), otherwise }. - // Optionally parse the encoded value into 'which' and add 2 to get the index. - int which = -1; - - // Unnamed type local to function or class. - if (ParseTwoCharToken(state, "Ut") && Optional(ParseNumber(state, &which)) && - which <= std::numeric_limits<int>::max() - 2 && // Don't overflow. - ParseOneCharToken(state, '_')) { - MaybeAppend(state, "{unnamed type#"); - MaybeAppendDecimal(state, 2 + which); - MaybeAppend(state, "}"); - return true; - } - state->parse_state = copy; - - // Closure type. - which = -1; - if (ParseTwoCharToken(state, "Ul") && DisableAppend(state) && - OneOrMore(ParseType, state) && RestoreAppend(state, copy.append) && - ParseOneCharToken(state, 'E') && Optional(ParseNumber(state, &which)) && - which <= std::numeric_limits<int>::max() - 2 && // Don't overflow. - ParseOneCharToken(state, '_')) { - MaybeAppend(state, "{lambda()#"); - MaybeAppendDecimal(state, 2 + which); - MaybeAppend(state, "}"); - return true; - } - state->parse_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) { - ComplexityGuard guard(state); - if (guard.IsTooComplex()) return false; - bool negative = false; - if (ParseOneCharToken(state, 'n')) { - negative = true; - } - const char *p = RemainingInput(state); - uint64_t number = 0; - for (; *p != '\0'; ++p) { - if (IsDigit(*p)) { - number = number * 10 + (*p - '0'); - } else { - break; - } - } - // Apply the sign with uint64_t arithmetic so overflows aren't UB. Gives - // "incorrect" results for out-of-range inputs, but negative values only - // appear for literals, which aren't printed. - if (negative) { - number = ~number + 1; - } - if (p != RemainingInput(state)) { // Conversion succeeded. - state->parse_state.mangled_idx += p - RemainingInput(state); - if (number_out != nullptr) { - // Note: possibly truncate "number". - *number_out = number; - } - return true; - } - return false; -} - -// Floating-point literals are encoded using a fixed-length lowercase -// hexadecimal string. -static bool ParseFloatNumber(State *state) { - ComplexityGuard guard(state); - if (guard.IsTooComplex()) return false; - const char *p = RemainingInput(state); - for (; *p != '\0'; ++p) { - if (!IsDigit(*p) && !(*p >= 'a' && *p <= 'f')) { - break; - } - } - if (p != RemainingInput(state)) { // Conversion succeeded. - state->parse_state.mangled_idx += p - RemainingInput(state); - 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) { - ComplexityGuard guard(state); - if (guard.IsTooComplex()) return false; - const char *p = RemainingInput(state); - for (; *p != '\0'; ++p) { - if (!IsDigit(*p) && !(*p >= 'A' && *p <= 'Z')) { - break; - } - } - if (p != RemainingInput(state)) { // Conversion succeeded. - state->parse_state.mangled_idx += p - RemainingInput(state); - return true; - } - return false; -} - -// <identifier> ::= <unqualified source code identifier> (of given length) -static bool ParseIdentifier(State *state, int length) { - ComplexityGuard guard(state); - if (guard.IsTooComplex()) return false; - if (length < 0 || !AtLeastNumCharsRemaining(RemainingInput(state), length)) { - return false; - } - if (IdentifierIsAnonymousNamespace(state, length)) { - MaybeAppend(state, "(anonymous namespace)"); - } else { - MaybeAppendWithLength(state, RemainingInput(state), length); - } - state->parse_state.mangled_idx += length; - return true; -} - -// <operator-name> ::= nw, and other two letters cases -// ::= cv <type> # (cast) -// ::= v <digit> <source-name> # vendor extended operator -static bool ParseOperatorName(State *state, int *arity) { - ComplexityGuard guard(state); - if (guard.IsTooComplex()) return false; - if (!AtLeastNumCharsRemaining(RemainingInput(state), 2)) { - return false; - } - // First check with "cv" (cast) case. - ParseState copy = state->parse_state; - if (ParseTwoCharToken(state, "cv") && MaybeAppend(state, "operator ") && - EnterNestedName(state) && ParseType(state) && - LeaveNestedName(state, copy.nest_level)) { - if (arity != nullptr) { - *arity = 1; - } - return true; - } - state->parse_state = copy; - - // Then vendor extended operators. - if (ParseOneCharToken(state, 'v') && ParseDigit(state, arity) && - ParseSourceName(state)) { - return true; - } - state->parse_state = copy; - - // Other operator names should start with a lower alphabet followed - // by a lower/upper alphabet. - if (!(IsLower(RemainingInput(state)[0]) && - IsAlpha(RemainingInput(state)[1]))) { - return false; - } - // We may want to perform a binary search if we really need speed. - const AbbrevPair *p; - for (p = kOperatorList; p->abbrev != nullptr; ++p) { - if (RemainingInput(state)[0] == p->abbrev[0] && - RemainingInput(state)[1] == p->abbrev[1]) { - if (arity != nullptr) { - *arity = p->arity; - } - MaybeAppend(state, "operator"); - if (IsLower(*p->real_name)) { // new, delete, etc. - MaybeAppend(state, " "); - } - MaybeAppend(state, p->real_name); - state->parse_state.mangled_idx += 2; - return true; - } - } - return false; -} - -// <special-name> ::= TV <type> -// ::= TT <type> -// ::= TI <type> -// ::= TS <type> -// ::= TH <type> # thread-local -// ::= 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) { - ComplexityGuard guard(state); - if (guard.IsTooComplex()) return false; - ParseState copy = state->parse_state; - if (ParseOneCharToken(state, 'T') && ParseCharClass(state, "VTISH") && - ParseType(state)) { - return true; - } - state->parse_state = copy; - - if (ParseTwoCharToken(state, "Tc") && ParseCallOffset(state) && - ParseCallOffset(state) && ParseEncoding(state)) { - return true; - } - state->parse_state = copy; - - if (ParseTwoCharToken(state, "GV") && ParseName(state)) { - return true; - } - state->parse_state = copy; - - if (ParseOneCharToken(state, 'T') && ParseCallOffset(state) && - ParseEncoding(state)) { - return true; - } - state->parse_state = copy; - - // G++ extensions - if (ParseTwoCharToken(state, "TC") && ParseType(state) && - ParseNumber(state, nullptr) && ParseOneCharToken(state, '_') && - DisableAppend(state) && ParseType(state)) { - RestoreAppend(state, copy.append); - return true; - } - state->parse_state = copy; - - if (ParseOneCharToken(state, 'T') && ParseCharClass(state, "FJ") && - ParseType(state)) { - return true; - } - state->parse_state = copy; - - if (ParseTwoCharToken(state, "GR") && ParseName(state)) { - return true; - } - state->parse_state = copy; - - if (ParseTwoCharToken(state, "GA") && ParseEncoding(state)) { - return true; - } - state->parse_state = copy; - - if (ParseOneCharToken(state, 'T') && ParseCharClass(state, "hv") && - ParseCallOffset(state) && ParseEncoding(state)) { - return true; - } - state->parse_state = copy; - return false; -} - -// <call-offset> ::= h <nv-offset> _ -// ::= v <v-offset> _ -static bool ParseCallOffset(State *state) { - ComplexityGuard guard(state); - if (guard.IsTooComplex()) return false; - ParseState copy = state->parse_state; - if (ParseOneCharToken(state, 'h') && ParseNVOffset(state) && - ParseOneCharToken(state, '_')) { - return true; - } - state->parse_state = copy; - - if (ParseOneCharToken(state, 'v') && ParseVOffset(state) && - ParseOneCharToken(state, '_')) { - return true; - } - state->parse_state = copy; - - return false; -} - -// <nv-offset> ::= <(offset) number> -static bool ParseNVOffset(State *state) { - ComplexityGuard guard(state); - if (guard.IsTooComplex()) return false; - return ParseNumber(state, nullptr); -} - -// <v-offset> ::= <(offset) number> _ <(virtual offset) number> -static bool ParseVOffset(State *state) { - ComplexityGuard guard(state); - if (guard.IsTooComplex()) return false; - ParseState copy = state->parse_state; - if (ParseNumber(state, nullptr) && ParseOneCharToken(state, '_') && - ParseNumber(state, nullptr)) { - return true; - } - state->parse_state = copy; - return false; -} - -// <ctor-dtor-name> ::= C1 | C2 | C3 | CI1 <base-class-type> | CI2 -// <base-class-type> -// ::= D0 | D1 | D2 -// # GCC extensions: "unified" constructor/destructor. See -// # -// https://github.com/gcc-mirror/gcc/blob/7ad17b583c3643bd4557f29b8391ca7ef08391f5/gcc/cp/mangle.c#L1847 -// ::= C4 | D4 -static bool ParseCtorDtorName(State *state) { - ComplexityGuard guard(state); - if (guard.IsTooComplex()) return false; - ParseState copy = state->parse_state; - if (ParseOneCharToken(state, 'C')) { - if (ParseCharClass(state, "1234")) { - const char *const prev_name = - state->out + state->parse_state.prev_name_idx; - MaybeAppendWithLength(state, prev_name, - state->parse_state.prev_name_length); - return true; - } else if (ParseOneCharToken(state, 'I') && ParseCharClass(state, "12") && - ParseClassEnumType(state)) { - return true; - } - } - state->parse_state = copy; - - if (ParseOneCharToken(state, 'D') && ParseCharClass(state, "0124")) { - const char *const prev_name = state->out + state->parse_state.prev_name_idx; - MaybeAppend(state, "~"); - MaybeAppendWithLength(state, prev_name, - state->parse_state.prev_name_length); - return true; - } - state->parse_state = copy; - return false; -} - -// <decltype> ::= 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 ParseDecltype(State *state) { - ComplexityGuard guard(state); - if (guard.IsTooComplex()) return false; - - ParseState copy = state->parse_state; - if (ParseOneCharToken(state, 'D') && ParseCharClass(state, "tT") && - ParseExpression(state) && ParseOneCharToken(state, 'E')) { - return true; - } - state->parse_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> # note: just an alias for <name> -// ::= <array-type> -// ::= <pointer-to-member-type> -// ::= <template-template-param> <template-args> -// ::= <template-param> -// ::= <decltype> -// ::= <substitution> -// ::= Dp <type> # pack expansion of (C++0x) -// ::= Dv <num-elems> _ # GNU vector extension -// -static bool ParseType(State *state) { - ComplexityGuard guard(state); - if (guard.IsTooComplex()) return false; - ParseState copy = state->parse_state; - - // We should check CV-qualifers, and PRGC things first. - // - // CV-qualifiers overlap with some operator names, but an operator name is not - // valid as a type. To avoid an ambiguity that can lead to exponential time - // complexity, refuse to backtrack the CV-qualifiers. - // - // _Z4aoeuIrMvvE - // => _Z 4aoeuI rM v v E - // aoeu<operator%=, void, void> - // => _Z 4aoeuI r Mv v E - // aoeu<void void::* restrict> - // - // By consuming the CV-qualifiers first, the former parse is disabled. - if (ParseCVQualifiers(state)) { - const bool result = ParseType(state); - if (!result) state->parse_state = copy; - return result; - } - state->parse_state = copy; - - // Similarly, these tag characters can overlap with other <name>s resulting in - // two different parse prefixes that land on <template-args> in the same - // place, such as "C3r1xI...". So, disable the "ctor-name = C3" parse by - // refusing to backtrack the tag characters. - if (ParseCharClass(state, "OPRCG")) { - const bool result = ParseType(state); - if (!result) state->parse_state = copy; - return result; - } - state->parse_state = copy; - - if (ParseTwoCharToken(state, "Dp") && ParseType(state)) { - return true; - } - state->parse_state = copy; - - if (ParseOneCharToken(state, 'U') && ParseSourceName(state) && - ParseType(state)) { - return true; - } - state->parse_state = copy; - - if (ParseBuiltinType(state) || ParseFunctionType(state) || - ParseClassEnumType(state) || ParseArrayType(state) || - ParsePointerToMemberType(state) || ParseDecltype(state) || - // "std" on its own isn't a type. - ParseSubstitution(state, /*accept_std=*/false)) { - return true; - } - - if (ParseTemplateTemplateParam(state) && ParseTemplateArgs(state)) { - return true; - } - state->parse_state = copy; - - // Less greedy than <template-template-param> <template-args>. - if (ParseTemplateParam(state)) { - return true; - } - - if (ParseTwoCharToken(state, "Dv") && ParseNumber(state, nullptr) && - ParseOneCharToken(state, '_')) { - return true; - } - state->parse_state = copy; - - 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) { - ComplexityGuard guard(state); - if (guard.IsTooComplex()) return false; - 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. # single-character builtin types -// ::= u <source-name> -// ::= Dd, etc. # two-character builtin types -// -// Not supported: -// ::= DF <number> _ # _FloatN (N bits) -// -static bool ParseBuiltinType(State *state) { - ComplexityGuard guard(state); - if (guard.IsTooComplex()) return false; - const AbbrevPair *p; - for (p = kBuiltinTypeList; p->abbrev != nullptr; ++p) { - // Guaranteed only 1- or 2-character strings in kBuiltinTypeList. - if (p->abbrev[1] == '\0') { - if (ParseOneCharToken(state, p->abbrev[0])) { - MaybeAppend(state, p->real_name); - return true; - } - } else if (p->abbrev[2] == '\0' && ParseTwoCharToken(state, p->abbrev)) { - MaybeAppend(state, p->real_name); - return true; - } - } - - ParseState copy = state->parse_state; - if (ParseOneCharToken(state, 'u') && ParseSourceName(state)) { - return true; - } - state->parse_state = copy; - return false; -} - -// <exception-spec> ::= Do # non-throwing -// exception-specification (e.g., -// noexcept, throw()) -// ::= DO <expression> E # computed (instantiation-dependent) -// noexcept -// ::= Dw <type>+ E # dynamic exception specification -// with instantiation-dependent types -static bool ParseExceptionSpec(State *state) { - ComplexityGuard guard(state); - if (guard.IsTooComplex()) return false; - - if (ParseTwoCharToken(state, "Do")) return true; - - ParseState copy = state->parse_state; - if (ParseTwoCharToken(state, "DO") && ParseExpression(state) && - ParseOneCharToken(state, 'E')) { - return true; - } - state->parse_state = copy; - if (ParseTwoCharToken(state, "Dw") && OneOrMore(ParseType, state) && - ParseOneCharToken(state, 'E')) { - return true; - } - state->parse_state = copy; - - return false; -} - -// <function-type> ::= [exception-spec] F [Y] <bare-function-type> [O] E -static bool ParseFunctionType(State *state) { - ComplexityGuard guard(state); - if (guard.IsTooComplex()) return false; - ParseState copy = state->parse_state; - if (Optional(ParseExceptionSpec(state)) && ParseOneCharToken(state, 'F') && - Optional(ParseOneCharToken(state, 'Y')) && ParseBareFunctionType(state) && - Optional(ParseOneCharToken(state, 'O')) && - ParseOneCharToken(state, 'E')) { - return true; - } - state->parse_state = copy; - return false; -} - -// <bare-function-type> ::= <(signature) type>+ -static bool ParseBareFunctionType(State *state) { - ComplexityGuard guard(state); - if (guard.IsTooComplex()) return false; - ParseState copy = state->parse_state; - DisableAppend(state); - if (OneOrMore(ParseType, state)) { - RestoreAppend(state, copy.append); - MaybeAppend(state, "()"); - return true; - } - state->parse_state = copy; - return false; -} - -// <class-enum-type> ::= <name> -static bool ParseClassEnumType(State *state) { - ComplexityGuard guard(state); - if (guard.IsTooComplex()) return false; - return ParseName(state); -} - -// <array-type> ::= A <(positive dimension) number> _ <(element) type> -// ::= A [<(dimension) expression>] _ <(element) type> -static bool ParseArrayType(State *state) { - ComplexityGuard guard(state); - if (guard.IsTooComplex()) return false; - ParseState copy = state->parse_state; - if (ParseOneCharToken(state, 'A') && ParseNumber(state, nullptr) && - ParseOneCharToken(state, '_') && ParseType(state)) { - return true; - } - state->parse_state = copy; - - if (ParseOneCharToken(state, 'A') && Optional(ParseExpression(state)) && - ParseOneCharToken(state, '_') && ParseType(state)) { - return true; - } - state->parse_state = copy; - return false; -} - -// <pointer-to-member-type> ::= M <(class) type> <(member) type> -static bool ParsePointerToMemberType(State *state) { - ComplexityGuard guard(state); - if (guard.IsTooComplex()) return false; - ParseState copy = state->parse_state; - if (ParseOneCharToken(state, 'M') && ParseType(state) && ParseType(state)) { - return true; - } - state->parse_state = copy; - return false; -} - -// <template-param> ::= T_ -// ::= T <parameter-2 non-negative number> _ -static bool ParseTemplateParam(State *state) { - ComplexityGuard guard(state); - if (guard.IsTooComplex()) return false; - if (ParseTwoCharToken(state, "T_")) { - MaybeAppend(state, "?"); // We don't support template substitutions. - return true; - } - - ParseState copy = state->parse_state; - if (ParseOneCharToken(state, 'T') && ParseNumber(state, nullptr) && - ParseOneCharToken(state, '_')) { - MaybeAppend(state, "?"); // We don't support template substitutions. - return true; - } - state->parse_state = copy; - return false; -} - -// <template-template-param> ::= <template-param> -// ::= <substitution> -static bool ParseTemplateTemplateParam(State *state) { - ComplexityGuard guard(state); - if (guard.IsTooComplex()) return false; - return (ParseTemplateParam(state) || - // "std" on its own isn't a template. - ParseSubstitution(state, /*accept_std=*/false)); -} - -// <template-args> ::= I <template-arg>+ E -static bool ParseTemplateArgs(State *state) { - ComplexityGuard guard(state); - if (guard.IsTooComplex()) return false; - ParseState copy = state->parse_state; - DisableAppend(state); - if (ParseOneCharToken(state, 'I') && OneOrMore(ParseTemplateArg, state) && - ParseOneCharToken(state, 'E')) { - RestoreAppend(state, copy.append); - MaybeAppend(state, "<>"); - return true; - } - state->parse_state = copy; - return false; -} - -// <template-arg> ::= <type> -// ::= <expr-primary> -// ::= J <template-arg>* E # argument pack -// ::= X <expression> E -static bool ParseTemplateArg(State *state) { - ComplexityGuard guard(state); - if (guard.IsTooComplex()) return false; - ParseState copy = state->parse_state; - if (ParseOneCharToken(state, 'J') && ZeroOrMore(ParseTemplateArg, state) && - ParseOneCharToken(state, 'E')) { - return true; - } - state->parse_state = copy; - - // There can be significant overlap between the following leading to - // exponential backtracking: - // - // <expr-primary> ::= L <type> <expr-cast-value> E - // e.g. L 2xxIvE 1 E - // <type> ==> <local-source-name> <template-args> - // e.g. L 2xx IvE - // - // This means parsing an entire <type> twice, and <type> can contain - // <template-arg>, so this can generate exponential backtracking. There is - // only overlap when the remaining input starts with "L <source-name>", so - // parse all cases that can start this way jointly to share the common prefix. - // - // We have: - // - // <template-arg> ::= <type> - // ::= <expr-primary> - // - // First, drop all the productions of <type> that must start with something - // other than 'L'. All that's left is <class-enum-type>; inline it. - // - // <type> ::= <nested-name> # starts with 'N' - // ::= <unscoped-name> - // ::= <unscoped-template-name> <template-args> - // ::= <local-name> # starts with 'Z' - // - // Drop and inline again: - // - // <type> ::= <unscoped-name> - // ::= <unscoped-name> <template-args> - // ::= <substitution> <template-args> # starts with 'S' - // - // Merge the first two, inline <unscoped-name>, drop last: - // - // <type> ::= <unqualified-name> [<template-args>] - // ::= St <unqualified-name> [<template-args>] # starts with 'S' - // - // Drop and inline: - // - // <type> ::= <operator-name> [<template-args>] # starts with lowercase - // ::= <ctor-dtor-name> [<template-args>] # starts with 'C' or 'D' - // ::= <source-name> [<template-args>] # starts with digit - // ::= <local-source-name> [<template-args>] - // ::= <unnamed-type-name> [<template-args>] # starts with 'U' - // - // One more time: - // - // <type> ::= L <source-name> [<template-args>] - // - // Likewise with <expr-primary>: - // - // <expr-primary> ::= L <type> <expr-cast-value> E - // ::= LZ <encoding> E # cannot overlap; drop - // ::= L <mangled_name> E # cannot overlap; drop - // - // By similar reasoning as shown above, the only <type>s starting with - // <source-name> are "<source-name> [<template-args>]". Inline this. - // - // <expr-primary> ::= L <source-name> [<template-args>] <expr-cast-value> E - // - // Now inline both of these into <template-arg>: - // - // <template-arg> ::= L <source-name> [<template-args>] - // ::= L <source-name> [<template-args>] <expr-cast-value> E - // - // Merge them and we're done: - // <template-arg> - // ::= L <source-name> [<template-args>] [<expr-cast-value> E] - if (ParseLocalSourceName(state) && Optional(ParseTemplateArgs(state))) { - copy = state->parse_state; - if (ParseExprCastValue(state) && ParseOneCharToken(state, 'E')) { - return true; - } - state->parse_state = copy; - return true; - } - - // Now that the overlapping cases can't reach this code, we can safely call - // both of these. - if (ParseType(state) || ParseExprPrimary(state)) { - return true; - } - state->parse_state = copy; - - if (ParseOneCharToken(state, 'X') && ParseExpression(state) && - ParseOneCharToken(state, 'E')) { - return true; - } - state->parse_state = copy; - return false; -} - -// <unresolved-type> ::= <template-param> [<template-args>] -// ::= <decltype> -// ::= <substitution> -static inline bool ParseUnresolvedType(State *state) { - // No ComplexityGuard because we don't copy the state in this stack frame. - return (ParseTemplateParam(state) && Optional(ParseTemplateArgs(state))) || - ParseDecltype(state) || ParseSubstitution(state, /*accept_std=*/false); -} - -// <simple-id> ::= <source-name> [<template-args>] -static inline bool ParseSimpleId(State *state) { - // No ComplexityGuard because we don't copy the state in this stack frame. - - // Note: <simple-id> cannot be followed by a parameter pack; see comment in - // ParseUnresolvedType. - return ParseSourceName(state) && Optional(ParseTemplateArgs(state)); -} - -// <base-unresolved-name> ::= <source-name> [<template-args>] -// ::= on <operator-name> [<template-args>] -// ::= dn <destructor-name> -static bool ParseBaseUnresolvedName(State *state) { - ComplexityGuard guard(state); - if (guard.IsTooComplex()) return false; - - if (ParseSimpleId(state)) { - return true; - } - - ParseState copy = state->parse_state; - if (ParseTwoCharToken(state, "on") && ParseOperatorName(state, nullptr) && - Optional(ParseTemplateArgs(state))) { - return true; - } - state->parse_state = copy; - - if (ParseTwoCharToken(state, "dn") && - (ParseUnresolvedType(state) || ParseSimpleId(state))) { - return true; - } - state->parse_state = copy; - - return false; -} - -// <unresolved-name> ::= [gs] <base-unresolved-name> -// ::= sr <unresolved-type> <base-unresolved-name> -// ::= srN <unresolved-type> <unresolved-qualifier-level>+ E -// <base-unresolved-name> -// ::= [gs] sr <unresolved-qualifier-level>+ E -// <base-unresolved-name> -static bool ParseUnresolvedName(State *state) { - ComplexityGuard guard(state); - if (guard.IsTooComplex()) return false; - - ParseState copy = state->parse_state; - if (Optional(ParseTwoCharToken(state, "gs")) && - ParseBaseUnresolvedName(state)) { - return true; - } - state->parse_state = copy; - - if (ParseTwoCharToken(state, "sr") && ParseUnresolvedType(state) && - ParseBaseUnresolvedName(state)) { - return true; - } - state->parse_state = copy; - - if (ParseTwoCharToken(state, "sr") && ParseOneCharToken(state, 'N') && - ParseUnresolvedType(state) && - OneOrMore(/* <unresolved-qualifier-level> ::= */ ParseSimpleId, state) && - ParseOneCharToken(state, 'E') && ParseBaseUnresolvedName(state)) { - return true; - } - state->parse_state = copy; - - if (Optional(ParseTwoCharToken(state, "gs")) && - ParseTwoCharToken(state, "sr") && - OneOrMore(/* <unresolved-qualifier-level> ::= */ ParseSimpleId, state) && - ParseOneCharToken(state, 'E') && ParseBaseUnresolvedName(state)) { - return true; - } - state->parse_state = copy; - - return false; -} - -// <expression> ::= <1-ary operator-name> <expression> -// ::= <2-ary operator-name> <expression> <expression> -// ::= <3-ary operator-name> <expression> <expression> <expression> -// ::= cl <expression>+ E -// ::= cv <type> <expression> # type (expression) -// ::= cv <type> _ <expression>* E # type (expr-list) -// ::= st <type> -// ::= <template-param> -// ::= <function-param> -// ::= <expr-primary> -// ::= dt <expression> <unresolved-name> # expr.name -// ::= pt <expression> <unresolved-name> # expr->name -// ::= sp <expression> # argument pack expansion -// ::= sr <type> <unqualified-name> <template-args> -// ::= sr <type> <unqualified-name> -// <function-param> ::= fp <(top-level) CV-qualifiers> _ -// ::= fp <(top-level) CV-qualifiers> <number> _ -// ::= fL <number> p <(top-level) CV-qualifiers> _ -// ::= fL <number> p <(top-level) CV-qualifiers> <number> _ -static bool ParseExpression(State *state) { - ComplexityGuard guard(state); - if (guard.IsTooComplex()) return false; - if (ParseTemplateParam(state) || ParseExprPrimary(state)) { - return true; - } - - // Object/function call expression. - ParseState copy = state->parse_state; - if (ParseTwoCharToken(state, "cl") && OneOrMore(ParseExpression, state) && - ParseOneCharToken(state, 'E')) { - return true; - } - state->parse_state = copy; - - // Function-param expression (level 0). - if (ParseTwoCharToken(state, "fp") && Optional(ParseCVQualifiers(state)) && - Optional(ParseNumber(state, nullptr)) && ParseOneCharToken(state, '_')) { - return true; - } - state->parse_state = copy; - - // Function-param expression (level 1+). - if (ParseTwoCharToken(state, "fL") && Optional(ParseNumber(state, nullptr)) && - ParseOneCharToken(state, 'p') && Optional(ParseCVQualifiers(state)) && - Optional(ParseNumber(state, nullptr)) && ParseOneCharToken(state, '_')) { - return true; - } - state->parse_state = copy; - - // Parse the conversion expressions jointly to avoid re-parsing the <type> in - // their common prefix. Parsed as: - // <expression> ::= cv <type> <conversion-args> - // <conversion-args> ::= _ <expression>* E - // ::= <expression> - // - // Also don't try ParseOperatorName after seeing "cv", since ParseOperatorName - // also needs to accept "cv <type>" in other contexts. - if (ParseTwoCharToken(state, "cv")) { - if (ParseType(state)) { - ParseState copy2 = state->parse_state; - if (ParseOneCharToken(state, '_') && ZeroOrMore(ParseExpression, state) && - ParseOneCharToken(state, 'E')) { - return true; - } - state->parse_state = copy2; - if (ParseExpression(state)) { - return true; - } - } - } else { - // Parse unary, binary, and ternary operator expressions jointly, taking - // care not to re-parse subexpressions repeatedly. Parse like: - // <expression> ::= <operator-name> <expression> - // [<one-to-two-expressions>] - // <one-to-two-expressions> ::= <expression> [<expression>] - int arity = -1; - if (ParseOperatorName(state, &arity) && - arity > 0 && // 0 arity => disabled. - (arity < 3 || ParseExpression(state)) && - (arity < 2 || ParseExpression(state)) && - (arity < 1 || ParseExpression(state))) { - return true; - } - } - state->parse_state = copy; - - // sizeof type - if (ParseTwoCharToken(state, "st") && ParseType(state)) { - return true; - } - state->parse_state = copy; - - // Object and pointer member access expressions. - if ((ParseTwoCharToken(state, "dt") || ParseTwoCharToken(state, "pt")) && - ParseExpression(state) && ParseType(state)) { - return true; - } - state->parse_state = copy; - - // Pointer-to-member access expressions. This parses the same as a binary - // operator, but it's implemented separately because "ds" shouldn't be - // accepted in other contexts that parse an operator name. - if (ParseTwoCharToken(state, "ds") && ParseExpression(state) && - ParseExpression(state)) { - return true; - } - state->parse_state = copy; - - // Parameter pack expansion - if (ParseTwoCharToken(state, "sp") && ParseExpression(state)) { - return true; - } - state->parse_state = copy; - - return ParseUnresolvedName(state); -} - -// <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 -// -// Warning, subtle: the "bug" LZ production above is ambiguous with the first -// production where <type> starts with <local-name>, which can lead to -// exponential backtracking in two scenarios: -// -// - When whatever follows the E in the <local-name> in the first production is -// not a name, we backtrack the whole <encoding> and re-parse the whole thing. -// -// - When whatever follows the <local-name> in the first production is not a -// number and this <expr-primary> may be followed by a name, we backtrack the -// <name> and re-parse it. -// -// Moreover this ambiguity isn't always resolved -- for example, the following -// has two different parses: -// -// _ZaaILZ4aoeuE1x1EvE -// => operator&&<aoeu, x, E, void> -// => operator&&<(aoeu::x)(1), void> -// -// To resolve this, we just do what GCC's demangler does, and refuse to parse -// casts to <local-name> types. -static bool ParseExprPrimary(State *state) { - ComplexityGuard guard(state); - if (guard.IsTooComplex()) return false; - ParseState copy = state->parse_state; - - // The "LZ" special case: if we see LZ, we commit to accept "LZ <encoding> E" - // or fail, no backtracking. - if (ParseTwoCharToken(state, "LZ")) { - if (ParseEncoding(state) && ParseOneCharToken(state, 'E')) { - return true; - } - - state->parse_state = copy; - return false; - } - - // The merged cast production. - if (ParseOneCharToken(state, 'L') && ParseType(state) && - ParseExprCastValue(state)) { - return true; - } - state->parse_state = copy; - - if (ParseOneCharToken(state, 'L') && ParseMangledName(state) && - ParseOneCharToken(state, 'E')) { - return true; - } - state->parse_state = copy; - - return false; -} - -// <number> or <float>, followed by 'E', as described above ParseExprPrimary. -static bool ParseExprCastValue(State *state) { - ComplexityGuard guard(state); - if (guard.IsTooComplex()) return false; - // We have to be able to backtrack after accepting a number because we could - // have e.g. "7fffE", which will accept "7" as a number but then fail to find - // the 'E'. - ParseState copy = state->parse_state; - if (ParseNumber(state, nullptr) && ParseOneCharToken(state, 'E')) { - return true; - } - state->parse_state = copy; - - if (ParseFloatNumber(state) && ParseOneCharToken(state, 'E')) { - return true; - } - state->parse_state = copy; - - return false; -} - -// <local-name> ::= Z <(function) encoding> E <(entity) name> [<discriminator>] -// ::= Z <(function) encoding> E s [<discriminator>] -// -// Parsing a common prefix of these two productions together avoids an -// exponential blowup of backtracking. Parse like: -// <local-name> := Z <encoding> E <local-name-suffix> -// <local-name-suffix> ::= s [<discriminator>] -// ::= <name> [<discriminator>] - -static bool ParseLocalNameSuffix(State *state) { - ComplexityGuard guard(state); - if (guard.IsTooComplex()) return false; - - if (MaybeAppend(state, "::") && ParseName(state) && - Optional(ParseDiscriminator(state))) { - return true; - } - - // Since we're not going to overwrite the above "::" by re-parsing the - // <encoding> (whose trailing '\0' byte was in the byte now holding the - // first ':'), we have to rollback the "::" if the <name> parse failed. - if (state->parse_state.append) { - state->out[state->parse_state.out_cur_idx - 2] = '\0'; - } - - return ParseOneCharToken(state, 's') && Optional(ParseDiscriminator(state)); -} - -static bool ParseLocalName(State *state) { - ComplexityGuard guard(state); - if (guard.IsTooComplex()) return false; - ParseState copy = state->parse_state; - if (ParseOneCharToken(state, 'Z') && ParseEncoding(state) && - ParseOneCharToken(state, 'E') && ParseLocalNameSuffix(state)) { - return true; - } - state->parse_state = copy; - return false; -} - -// <discriminator> := _ <(non-negative) number> -static bool ParseDiscriminator(State *state) { - ComplexityGuard guard(state); - if (guard.IsTooComplex()) return false; - ParseState copy = state->parse_state; - if (ParseOneCharToken(state, '_') && ParseNumber(state, nullptr)) { - return true; - } - state->parse_state = copy; - return false; -} - -// <substitution> ::= S_ -// ::= S <seq-id> _ -// ::= St, etc. -// -// "St" is special in that it's not valid as a standalone name, and it *is* -// allowed to precede a name without being wrapped in "N...E". This means that -// if we accept it on its own, we can accept "St1a" and try to parse -// template-args, then fail and backtrack, accept "St" on its own, then "1a" as -// an unqualified name and re-parse the same template-args. To block this -// exponential backtracking, we disable it with 'accept_std=false' in -// problematic contexts. -static bool ParseSubstitution(State *state, bool accept_std) { - ComplexityGuard guard(state); - if (guard.IsTooComplex()) return false; - if (ParseTwoCharToken(state, "S_")) { - MaybeAppend(state, "?"); // We don't support substitutions. - return true; - } - - ParseState copy = state->parse_state; - if (ParseOneCharToken(state, 'S') && ParseSeqId(state) && - ParseOneCharToken(state, '_')) { - MaybeAppend(state, "?"); // We don't support substitutions. - return true; - } - state->parse_state = copy; - - // Expand abbreviations like "St" => "std". - if (ParseOneCharToken(state, 'S')) { - const AbbrevPair *p; - for (p = kSubstitutionList; p->abbrev != nullptr; ++p) { - if (RemainingInput(state)[0] == p->abbrev[1] && - (accept_std || p->abbrev[1] != 't')) { - MaybeAppend(state, "std"); - if (p->real_name[0] != '\0') { - MaybeAppend(state, "::"); - MaybeAppend(state, p->real_name); - } - ++state->parse_state.mangled_idx; - return true; - } - } - } - state->parse_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) { - ComplexityGuard guard(state); - if (guard.IsTooComplex()) return false; - if (ParseMangledName(state)) { - if (RemainingInput(state)[0] != '\0') { - // Drop trailing function clone suffix, if any. - if (IsFunctionCloneSuffix(RemainingInput(state))) { - return true; - } - // Append trailing version suffix if any. - // ex. _Z3foo@@GLIBCXX_3.4 - if (RemainingInput(state)[0] == '@') { - MaybeAppend(state, RemainingInput(state)); - return true; - } - return false; // Unconsumed suffix. - } - return true; - } - return false; -} - -static bool Overflowed(const State *state) { - return state->parse_state.out_cur_idx >= state->out_end_idx; -} - -// The demangler entry point. -bool Demangle(const char *mangled, char *out, int out_size) { - State state; - InitState(&state, mangled, out, out_size); - return ParseTopLevelMangledName(&state) && !Overflowed(&state) && - state.parse_state.out_cur_idx > 0; -} - -} // namespace debugging_internal -ABSL_NAMESPACE_END -} // namespace absl diff --git a/third_party/abseil_cpp/absl/debugging/internal/demangle.h b/third_party/abseil_cpp/absl/debugging/internal/demangle.h deleted file mode 100644 index c314d9bc237c..000000000000 --- a/third_party/abseil_cpp/absl/debugging/internal/demangle.h +++ /dev/null @@ -1,71 +0,0 @@ -// Copyright 2018 The Abseil Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// https://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -// 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 ABSL_DEBUGGING_INTERNAL_DEMANGLE_H_ -#define ABSL_DEBUGGING_INTERNAL_DEMANGLE_H_ - -#include "absl/base/config.h" - -namespace absl { -ABSL_NAMESPACE_BEGIN -namespace debugging_internal { - -// 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 Demangle(const char *mangled, char *out, int out_size); - -} // namespace debugging_internal -ABSL_NAMESPACE_END -} // namespace absl - -#endif // ABSL_DEBUGGING_INTERNAL_DEMANGLE_H_ diff --git a/third_party/abseil_cpp/absl/debugging/internal/demangle_test.cc b/third_party/abseil_cpp/absl/debugging/internal/demangle_test.cc deleted file mode 100644 index 0bed7359d8b4..000000000000 --- a/third_party/abseil_cpp/absl/debugging/internal/demangle_test.cc +++ /dev/null @@ -1,197 +0,0 @@ -// Copyright 2018 The Abseil Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// https://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -#include "absl/debugging/internal/demangle.h" - -#include <cstdlib> -#include <string> - -#include "gtest/gtest.h" -#include "absl/base/config.h" -#include "absl/base/internal/raw_logging.h" -#include "absl/debugging/internal/stack_consumption.h" -#include "absl/memory/memory.h" - -namespace absl { -ABSL_NAMESPACE_BEGIN -namespace debugging_internal { -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; - } -} - -// Test corner cases of bounary conditions. -TEST(Demangle, CornerCases) { - char tmp[10]; - EXPECT_TRUE(Demangle("_Z6foobarv", tmp, sizeof(tmp))); - // sizeof("foobar()") == 9 - EXPECT_STREQ("foobar()", tmp); - EXPECT_TRUE(Demangle("_Z6foobarv", tmp, 9)); - EXPECT_STREQ("foobar()", tmp); - EXPECT_FALSE(Demangle("_Z6foobarv", tmp, 8)); // Not enough. - EXPECT_FALSE(Demangle("_Z6foobarv", tmp, 1)); - EXPECT_FALSE(Demangle("_Z6foobarv", tmp, 0)); - EXPECT_FALSE(Demangle("_Z6foobarv", nullptr, 0)); // Should not cause SEGV. - EXPECT_FALSE(Demangle("_Z1000000", tmp, 9)); -} - -// Test handling of functions suffixed with .clone.N, which is used -// by GCC 4.5.x (and our locally-modified version of GCC 4.4.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))); -} - -// Tests that verify that Demangle footprint is within some limit. -// They are not to be run under sanitizers as the sanitizers increase -// stack consumption by about 4x. -#if defined(ABSL_INTERNAL_HAVE_DEBUGGING_STACK_CONSUMPTION) && \ - !defined(ABSL_HAVE_ADDRESS_SANITIZER) && \ - !defined(ABSL_HAVE_MEMORY_SANITIZER) && \ - !defined(ABSL_HAVE_THREAD_SANITIZER) - -static const char *g_mangled; -static char g_demangle_buffer[4096]; -static char *g_demangle_result; - -static void DemangleSignalHandler(int signo) { - if (Demangle(g_mangled, g_demangle_buffer, sizeof(g_demangle_buffer))) { - g_demangle_result = g_demangle_buffer; - } else { - g_demangle_result = nullptr; - } -} - -// Call Demangle and figure out the stack footprint of this call. -static const char *DemangleStackConsumption(const char *mangled, - int *stack_consumed) { - g_mangled = mangled; - *stack_consumed = GetSignalHandlerStackConsumption(DemangleSignalHandler); - ABSL_RAW_LOG(INFO, "Stack consumption of Demangle: %d", *stack_consumed); - return g_demangle_result; -} - -// Demangle stack consumption should be within 8kB for simple mangled names -// with some level of nesting. With alternate signal stack we have 64K, -// but some signal handlers run on thread stack, and could have arbitrarily -// little space left (so we don't want to make this number too large). -const int kStackConsumptionUpperLimit = 8192; - -// Returns a mangled name nested to the given depth. -static std::string NestedMangledName(int depth) { - std::string mangled_name = "_Z1a"; - if (depth > 0) { - mangled_name += "IXL"; - mangled_name += NestedMangledName(depth - 1); - mangled_name += "EEE"; - } - return mangled_name; -} - -TEST(Demangle, DemangleStackConsumption) { - // Measure stack consumption of Demangle for nested mangled names of varying - // depth. Since Demangle is implemented as a recursive descent parser, - // stack consumption will grow as the nesting depth increases. By measuring - // the stack consumption for increasing depths, we can see the growing - // impact of any stack-saving changes made to the code for Demangle. - int stack_consumed = 0; - - const char *demangled = - DemangleStackConsumption("_Z6foobarv", &stack_consumed); - EXPECT_STREQ("foobar()", demangled); - EXPECT_GT(stack_consumed, 0); - EXPECT_LT(stack_consumed, kStackConsumptionUpperLimit); - - const std::string nested_mangled_name0 = NestedMangledName(0); - demangled = DemangleStackConsumption(nested_mangled_name0.c_str(), - &stack_consumed); - EXPECT_STREQ("a", demangled); - EXPECT_GT(stack_consumed, 0); - EXPECT_LT(stack_consumed, kStackConsumptionUpperLimit); - - const std::string nested_mangled_name1 = NestedMangledName(1); - demangled = DemangleStackConsumption(nested_mangled_name1.c_str(), - &stack_consumed); - EXPECT_STREQ("a<>", demangled); - EXPECT_GT(stack_consumed, 0); - EXPECT_LT(stack_consumed, kStackConsumptionUpperLimit); - - const std::string nested_mangled_name2 = NestedMangledName(2); - demangled = DemangleStackConsumption(nested_mangled_name2.c_str(), - &stack_consumed); - EXPECT_STREQ("a<>", demangled); - EXPECT_GT(stack_consumed, 0); - EXPECT_LT(stack_consumed, kStackConsumptionUpperLimit); - - const std::string nested_mangled_name3 = NestedMangledName(3); - demangled = DemangleStackConsumption(nested_mangled_name3.c_str(), - &stack_consumed); - EXPECT_STREQ("a<>", demangled); - EXPECT_GT(stack_consumed, 0); - EXPECT_LT(stack_consumed, kStackConsumptionUpperLimit); -} - -#endif // Stack consumption tests - -static void TestOnInput(const char* input) { - static const int kOutSize = 1048576; - auto out = absl::make_unique<char[]>(kOutSize); - Demangle(input, out.get(), kOutSize); -} - -TEST(DemangleRegression, NegativeLength) { - TestOnInput("_ZZn4"); -} - -TEST(DemangleRegression, DeeplyNestedArrayType) { - const int depth = 100000; - std::string data = "_ZStI"; - data.reserve(data.size() + 3 * depth + 1); - for (int i = 0; i < depth; i++) { - data += "A1_"; - } - TestOnInput(data.c_str()); -} - -} // namespace -} // namespace debugging_internal -ABSL_NAMESPACE_END -} // namespace absl diff --git a/third_party/abseil_cpp/absl/debugging/internal/elf_mem_image.cc b/third_party/abseil_cpp/absl/debugging/internal/elf_mem_image.cc deleted file mode 100644 index 24cc01302dc5..000000000000 --- a/third_party/abseil_cpp/absl/debugging/internal/elf_mem_image.cc +++ /dev/null @@ -1,382 +0,0 @@ -// Copyright 2017 The Abseil Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// https://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -// Allow dynamic symbol lookup in an in-memory Elf image. -// - -#include "absl/debugging/internal/elf_mem_image.h" - -#ifdef ABSL_HAVE_ELF_MEM_IMAGE // defined in elf_mem_image.h - -#include <string.h> -#include <cassert> -#include <cstddef> -#include "absl/base/internal/raw_logging.h" - -// From binutils/include/elf/common.h (this doesn't appear to be documented -// anywhere else). -// -// /* This flag appears in a Versym structure. It means that the symbol -// is hidden, and is only visible with an explicit version number. -// This is a GNU extension. */ -// #define VERSYM_HIDDEN 0x8000 -// -// /* This is the mask for the rest of the Versym information. */ -// #define VERSYM_VERSION 0x7fff - -#define VERSYM_VERSION 0x7fff - -namespace absl { -ABSL_NAMESPACE_BEGIN -namespace debugging_internal { - -namespace { - -#if __WORDSIZE == 32 -const int kElfClass = ELFCLASS32; -int ElfBind(const ElfW(Sym) *symbol) { return ELF32_ST_BIND(symbol->st_info); } -int ElfType(const ElfW(Sym) *symbol) { return ELF32_ST_TYPE(symbol->st_info); } -#elif __WORDSIZE == 64 -const int kElfClass = ELFCLASS64; -int ElfBind(const ElfW(Sym) *symbol) { return ELF64_ST_BIND(symbol->st_info); } -int ElfType(const ElfW(Sym) *symbol) { return ELF64_ST_TYPE(symbol->st_info); } -#else -const int kElfClass = -1; -int ElfBind(const ElfW(Sym) *) { - ABSL_RAW_LOG(FATAL, "Unexpected word size"); - return 0; -} -int ElfType(const ElfW(Sym) *) { - ABSL_RAW_LOG(FATAL, "Unexpected word size"); - return 0; -} -#endif - -// Extract an element from one of the ELF tables, cast it to desired type. -// This is just a simple arithmetic and a glorified cast. -// Callers are responsible for bounds checking. -template <typename T> -const T *GetTableElement(const ElfW(Ehdr) * ehdr, ElfW(Off) table_offset, - ElfW(Word) element_size, size_t index) { - return reinterpret_cast<const T*>(reinterpret_cast<const char *>(ehdr) - + table_offset - + index * element_size); -} - -} // namespace - -// The value of this variable doesn't matter; it's used only for its -// unique address. -const int ElfMemImage::kInvalidBaseSentinel = 0; - -ElfMemImage::ElfMemImage(const void *base) { - ABSL_RAW_CHECK(base != kInvalidBase, "bad pointer"); - Init(base); -} - -int ElfMemImage::GetNumSymbols() const { - if (!hash_) { - return 0; - } - // See http://www.caldera.com/developers/gabi/latest/ch5.dynamic.html#hash - return hash_[1]; -} - -const ElfW(Sym) *ElfMemImage::GetDynsym(int index) const { - ABSL_RAW_CHECK(index < GetNumSymbols(), "index out of range"); - return dynsym_ + index; -} - -const ElfW(Versym) *ElfMemImage::GetVersym(int index) const { - ABSL_RAW_CHECK(index < GetNumSymbols(), "index out of range"); - return versym_ + index; -} - -const ElfW(Phdr) *ElfMemImage::GetPhdr(int index) const { - ABSL_RAW_CHECK(index < ehdr_->e_phnum, "index out of range"); - return GetTableElement<ElfW(Phdr)>(ehdr_, - ehdr_->e_phoff, - ehdr_->e_phentsize, - index); -} - -const char *ElfMemImage::GetDynstr(ElfW(Word) offset) const { - ABSL_RAW_CHECK(offset < strsize_, "offset out of range"); - return dynstr_ + offset; -} - -const void *ElfMemImage::GetSymAddr(const ElfW(Sym) *sym) const { - if (sym->st_shndx == SHN_UNDEF || sym->st_shndx >= SHN_LORESERVE) { - // Symbol corresponds to "special" (e.g. SHN_ABS) section. - return reinterpret_cast<const void *>(sym->st_value); - } - ABSL_RAW_CHECK(link_base_ < sym->st_value, "symbol out of range"); - return GetTableElement<char>(ehdr_, 0, 1, sym->st_value - link_base_); -} - -const ElfW(Verdef) *ElfMemImage::GetVerdef(int index) const { - ABSL_RAW_CHECK(0 <= index && static_cast<size_t>(index) <= verdefnum_, - "index out of range"); - const ElfW(Verdef) *version_definition = verdef_; - while (version_definition->vd_ndx < index && version_definition->vd_next) { - const char *const version_definition_as_char = - reinterpret_cast<const char *>(version_definition); - version_definition = - reinterpret_cast<const ElfW(Verdef) *>(version_definition_as_char + - version_definition->vd_next); - } - return version_definition->vd_ndx == index ? version_definition : nullptr; -} - -const ElfW(Verdaux) *ElfMemImage::GetVerdefAux( - const ElfW(Verdef) *verdef) const { - return reinterpret_cast<const ElfW(Verdaux) *>(verdef+1); -} - -const char *ElfMemImage::GetVerstr(ElfW(Word) offset) const { - ABSL_RAW_CHECK(offset < strsize_, "offset out of range"); - return dynstr_ + offset; -} - -void ElfMemImage::Init(const void *base) { - ehdr_ = nullptr; - dynsym_ = nullptr; - dynstr_ = nullptr; - versym_ = nullptr; - verdef_ = nullptr; - hash_ = nullptr; - strsize_ = 0; - verdefnum_ = 0; - link_base_ = ~0L; // Sentinel: PT_LOAD .p_vaddr can't possibly be this. - if (!base) { - return; - } - const char *const base_as_char = reinterpret_cast<const char *>(base); - if (base_as_char[EI_MAG0] != ELFMAG0 || base_as_char[EI_MAG1] != ELFMAG1 || - base_as_char[EI_MAG2] != ELFMAG2 || base_as_char[EI_MAG3] != ELFMAG3) { - assert(false); - return; - } - int elf_class = base_as_char[EI_CLASS]; - if (elf_class != kElfClass) { - assert(false); - return; - } - switch (base_as_char[EI_DATA]) { - case ELFDATA2LSB: { - if (__LITTLE_ENDIAN != __BYTE_ORDER) { - assert(false); - return; - } - break; - } - case ELFDATA2MSB: { - if (__BIG_ENDIAN != __BYTE_ORDER) { - assert(false); - return; - } - break; - } - default: { - assert(false); - return; - } - } - - ehdr_ = reinterpret_cast<const ElfW(Ehdr) *>(base); - const ElfW(Phdr) *dynamic_program_header = nullptr; - for (int i = 0; i < ehdr_->e_phnum; ++i) { - const ElfW(Phdr) *const program_header = GetPhdr(i); - switch (program_header->p_type) { - case PT_LOAD: - if (!~link_base_) { - link_base_ = program_header->p_vaddr; - } - break; - case PT_DYNAMIC: - dynamic_program_header = program_header; - break; - } - } - if (!~link_base_ || !dynamic_program_header) { - assert(false); - // Mark this image as not present. Can not recur infinitely. - Init(nullptr); - return; - } - ptrdiff_t relocation = - base_as_char - reinterpret_cast<const char *>(link_base_); - ElfW(Dyn) *dynamic_entry = - reinterpret_cast<ElfW(Dyn) *>(dynamic_program_header->p_vaddr + - relocation); - for (; dynamic_entry->d_tag != DT_NULL; ++dynamic_entry) { - const ElfW(Xword) value = dynamic_entry->d_un.d_val + relocation; - switch (dynamic_entry->d_tag) { - case DT_HASH: - hash_ = reinterpret_cast<ElfW(Word) *>(value); - break; - case DT_SYMTAB: - dynsym_ = reinterpret_cast<ElfW(Sym) *>(value); - break; - case DT_STRTAB: - dynstr_ = reinterpret_cast<const char *>(value); - break; - case DT_VERSYM: - versym_ = reinterpret_cast<ElfW(Versym) *>(value); - break; - case DT_VERDEF: - verdef_ = reinterpret_cast<ElfW(Verdef) *>(value); - break; - case DT_VERDEFNUM: - verdefnum_ = dynamic_entry->d_un.d_val; - break; - case DT_STRSZ: - strsize_ = dynamic_entry->d_un.d_val; - break; - default: - // Unrecognized entries explicitly ignored. - break; - } - } - if (!hash_ || !dynsym_ || !dynstr_ || !versym_ || - !verdef_ || !verdefnum_ || !strsize_) { - assert(false); // invalid VDSO - // Mark this image as not present. Can not recur infinitely. - Init(nullptr); - return; - } -} - -bool ElfMemImage::LookupSymbol(const char *name, - const char *version, - int type, - SymbolInfo *info_out) const { - for (const SymbolInfo& info : *this) { - if (strcmp(info.name, name) == 0 && strcmp(info.version, version) == 0 && - ElfType(info.symbol) == type) { - if (info_out) { - *info_out = info; - } - return true; - } - } - return false; -} - -bool ElfMemImage::LookupSymbolByAddress(const void *address, - SymbolInfo *info_out) const { - for (const SymbolInfo& info : *this) { - const char *const symbol_start = - reinterpret_cast<const char *>(info.address); - const char *const symbol_end = symbol_start + info.symbol->st_size; - if (symbol_start <= address && address < symbol_end) { - if (info_out) { - // Client wants to know details for that symbol (the usual case). - if (ElfBind(info.symbol) == STB_GLOBAL) { - // Strong symbol; just return it. - *info_out = info; - return true; - } else { - // Weak or local. Record it, but keep looking for a strong one. - *info_out = info; - } - } else { - // Client only cares if there is an overlapping symbol. - return true; - } - } - } - return false; -} - -ElfMemImage::SymbolIterator::SymbolIterator(const void *const image, int index) - : index_(index), image_(image) { -} - -const ElfMemImage::SymbolInfo *ElfMemImage::SymbolIterator::operator->() const { - return &info_; -} - -const ElfMemImage::SymbolInfo& ElfMemImage::SymbolIterator::operator*() const { - return info_; -} - -bool ElfMemImage::SymbolIterator::operator==(const SymbolIterator &rhs) const { - return this->image_ == rhs.image_ && this->index_ == rhs.index_; -} - -bool ElfMemImage::SymbolIterator::operator!=(const SymbolIterator &rhs) const { - return !(*this == rhs); -} - -ElfMemImage::SymbolIterator &ElfMemImage::SymbolIterator::operator++() { - this->Update(1); - return *this; -} - -ElfMemImage::SymbolIterator ElfMemImage::begin() const { - SymbolIterator it(this, 0); - it.Update(0); - return it; -} - -ElfMemImage::SymbolIterator ElfMemImage::end() const { - return SymbolIterator(this, GetNumSymbols()); -} - -void ElfMemImage::SymbolIterator::Update(int increment) { - const ElfMemImage *image = reinterpret_cast<const ElfMemImage *>(image_); - ABSL_RAW_CHECK(image->IsPresent() || increment == 0, ""); - if (!image->IsPresent()) { - return; - } - index_ += increment; - if (index_ >= image->GetNumSymbols()) { - index_ = image->GetNumSymbols(); - return; - } - const ElfW(Sym) *symbol = image->GetDynsym(index_); - const ElfW(Versym) *version_symbol = image->GetVersym(index_); - ABSL_RAW_CHECK(symbol && version_symbol, ""); - const char *const symbol_name = image->GetDynstr(symbol->st_name); - const ElfW(Versym) version_index = version_symbol[0] & VERSYM_VERSION; - const ElfW(Verdef) *version_definition = nullptr; - const char *version_name = ""; - if (symbol->st_shndx == SHN_UNDEF) { - // Undefined symbols reference DT_VERNEED, not DT_VERDEF, and - // version_index could well be greater than verdefnum_, so calling - // GetVerdef(version_index) may trigger assertion. - } else { - version_definition = image->GetVerdef(version_index); - } - if (version_definition) { - // I am expecting 1 or 2 auxiliary entries: 1 for the version itself, - // optional 2nd if the version has a parent. - ABSL_RAW_CHECK( - version_definition->vd_cnt == 1 || version_definition->vd_cnt == 2, - "wrong number of entries"); - const ElfW(Verdaux) *version_aux = image->GetVerdefAux(version_definition); - version_name = image->GetVerstr(version_aux->vda_name); - } - info_.name = symbol_name; - info_.version = version_name; - info_.address = image->GetSymAddr(symbol); - info_.symbol = symbol; -} - -} // namespace debugging_internal -ABSL_NAMESPACE_END -} // namespace absl - -#endif // ABSL_HAVE_ELF_MEM_IMAGE diff --git a/third_party/abseil_cpp/absl/debugging/internal/elf_mem_image.h b/third_party/abseil_cpp/absl/debugging/internal/elf_mem_image.h deleted file mode 100644 index 46bfade3503e..000000000000 --- a/third_party/abseil_cpp/absl/debugging/internal/elf_mem_image.h +++ /dev/null @@ -1,134 +0,0 @@ -/* - * Copyright 2017 The Abseil Authors. - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * https://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ - -// Allow dynamic symbol lookup for in-memory Elf images. - -#ifndef ABSL_DEBUGGING_INTERNAL_ELF_MEM_IMAGE_H_ -#define ABSL_DEBUGGING_INTERNAL_ELF_MEM_IMAGE_H_ - -// Including this will define the __GLIBC__ macro if glibc is being -// used. -#include <climits> - -#include "absl/base/config.h" - -// Maybe one day we can rewrite this file not to require the elf -// symbol extensions in glibc, but for right now we need them. -#ifdef ABSL_HAVE_ELF_MEM_IMAGE -#error ABSL_HAVE_ELF_MEM_IMAGE cannot be directly set -#endif - -#if defined(__ELF__) && defined(__GLIBC__) && !defined(__native_client__) && \ - !defined(__asmjs__) && !defined(__wasm__) -#define ABSL_HAVE_ELF_MEM_IMAGE 1 -#endif - -#ifdef ABSL_HAVE_ELF_MEM_IMAGE - -#include <link.h> // for ElfW - -namespace absl { -ABSL_NAMESPACE_BEGIN -namespace debugging_internal { - -// An in-memory ELF image (may not exist on disk). -class ElfMemImage { - private: - // Sentinel: there could never be an elf image at &kInvalidBaseSentinel. - static const int kInvalidBaseSentinel; - - public: - // Sentinel: there could never be an elf image at this address. - static constexpr const void *const kInvalidBase = - static_cast<const void*>(&kInvalidBaseSentinel); - - // Information about a single vdso symbol. - // All pointers are into .dynsym, .dynstr, or .text of the VDSO. - // Do not free() them or modify through them. - struct SymbolInfo { - const char *name; // E.g. "__vdso_getcpu" - const char *version; // E.g. "LINUX_2.6", could be "" - // for unversioned symbol. - const void *address; // Relocated symbol address. - const ElfW(Sym) *symbol; // Symbol in the dynamic symbol table. - }; - - // Supports iteration over all dynamic symbols. - class SymbolIterator { - public: - friend class ElfMemImage; - const SymbolInfo *operator->() const; - const SymbolInfo &operator*() const; - SymbolIterator& operator++(); - bool operator!=(const SymbolIterator &rhs) const; - bool operator==(const SymbolIterator &rhs) const; - private: - SymbolIterator(const void *const image, int index); - void Update(int incr); - SymbolInfo info_; - int index_; - const void *const image_; - }; - - - explicit ElfMemImage(const void *base); - void Init(const void *base); - bool IsPresent() const { return ehdr_ != nullptr; } - const ElfW(Phdr)* GetPhdr(int index) const; - const ElfW(Sym)* GetDynsym(int index) const; - const ElfW(Versym)* GetVersym(int index) const; - const ElfW(Verdef)* GetVerdef(int index) const; - const ElfW(Verdaux)* GetVerdefAux(const ElfW(Verdef) *verdef) const; - const char* GetDynstr(ElfW(Word) offset) const; - const void* GetSymAddr(const ElfW(Sym) *sym) const; - const char* GetVerstr(ElfW(Word) offset) const; - int GetNumSymbols() const; - - SymbolIterator begin() const; - SymbolIterator end() const; - - // Look up versioned dynamic symbol in the image. - // Returns false if image is not present, or doesn't contain given - // symbol/version/type combination. - // If info_out is non-null, additional details are filled in. - bool LookupSymbol(const char *name, const char *version, - int symbol_type, SymbolInfo *info_out) const; - - // Find info about symbol (if any) which overlaps given address. - // Returns true if symbol was found; false if image isn't present - // or doesn't have a symbol overlapping given address. - // If info_out is non-null, additional details are filled in. - bool LookupSymbolByAddress(const void *address, SymbolInfo *info_out) const; - - private: - const ElfW(Ehdr) *ehdr_; - const ElfW(Sym) *dynsym_; - const ElfW(Versym) *versym_; - const ElfW(Verdef) *verdef_; - const ElfW(Word) *hash_; - const char *dynstr_; - size_t strsize_; - size_t verdefnum_; - ElfW(Addr) link_base_; // Link-time base (p_vaddr of first PT_LOAD). -}; - -} // namespace debugging_internal -ABSL_NAMESPACE_END -} // namespace absl - -#endif // ABSL_HAVE_ELF_MEM_IMAGE - -#endif // ABSL_DEBUGGING_INTERNAL_ELF_MEM_IMAGE_H_ diff --git a/third_party/abseil_cpp/absl/debugging/internal/examine_stack.cc b/third_party/abseil_cpp/absl/debugging/internal/examine_stack.cc deleted file mode 100644 index 6e5ff1fbd836..000000000000 --- a/third_party/abseil_cpp/absl/debugging/internal/examine_stack.cc +++ /dev/null @@ -1,187 +0,0 @@ -// -// Copyright 2018 The Abseil Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// https://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. -// - -#include "absl/debugging/internal/examine_stack.h" - -#ifndef _WIN32 -#include <unistd.h> -#endif - -#ifdef __APPLE__ -#include <sys/ucontext.h> -#endif - -#include <csignal> -#include <cstdio> - -#include "absl/base/attributes.h" -#include "absl/base/internal/raw_logging.h" -#include "absl/base/macros.h" -#include "absl/debugging/stacktrace.h" -#include "absl/debugging/symbolize.h" - -namespace absl { -ABSL_NAMESPACE_BEGIN -namespace debugging_internal { - -// Returns the program counter from signal context, nullptr if -// unknown. vuc is a ucontext_t*. We use void* to avoid the use of -// ucontext_t on non-POSIX systems. -void* GetProgramCounter(void* vuc) { -#ifdef __linux__ - if (vuc != nullptr) { - ucontext_t* context = reinterpret_cast<ucontext_t*>(vuc); -#if defined(__aarch64__) - return reinterpret_cast<void*>(context->uc_mcontext.pc); -#elif defined(__arm__) - return reinterpret_cast<void*>(context->uc_mcontext.arm_pc); -#elif defined(__i386__) - if (14 < ABSL_ARRAYSIZE(context->uc_mcontext.gregs)) - return reinterpret_cast<void*>(context->uc_mcontext.gregs[14]); -#elif defined(__mips__) - return reinterpret_cast<void*>(context->uc_mcontext.pc); -#elif defined(__powerpc64__) - return reinterpret_cast<void*>(context->uc_mcontext.gp_regs[32]); -#elif defined(__powerpc__) - return reinterpret_cast<void*>(context->uc_mcontext.regs->nip); -#elif defined(__riscv) - return reinterpret_cast<void*>(context->uc_mcontext.__gregs[REG_PC]); -#elif defined(__s390__) && !defined(__s390x__) - return reinterpret_cast<void*>(context->uc_mcontext.psw.addr & 0x7fffffff); -#elif defined(__s390__) && defined(__s390x__) - return reinterpret_cast<void*>(context->uc_mcontext.psw.addr); -#elif defined(__x86_64__) - if (16 < ABSL_ARRAYSIZE(context->uc_mcontext.gregs)) - return reinterpret_cast<void*>(context->uc_mcontext.gregs[16]); -#else -#error "Undefined Architecture." -#endif - } -#elif defined(__APPLE__) - if (vuc != nullptr) { - ucontext_t* signal_ucontext = reinterpret_cast<ucontext_t*>(vuc); -#if defined(__aarch64__) - return reinterpret_cast<void*>( - __darwin_arm_thread_state64_get_pc(signal_ucontext->uc_mcontext->__ss)); -#elif defined(__arm__) -#if __DARWIN_UNIX03 - return reinterpret_cast<void*>(signal_ucontext->uc_mcontext->__ss.__pc); -#else - return reinterpret_cast<void*>(signal_ucontext->uc_mcontext->ss.pc); -#endif -#elif defined(__i386__) -#if __DARWIN_UNIX03 - return reinterpret_cast<void*>(signal_ucontext->uc_mcontext->__ss.__eip); -#else - return reinterpret_cast<void*>(signal_ucontext->uc_mcontext->ss.eip); -#endif -#elif defined(__x86_64__) -#if __DARWIN_UNIX03 - return reinterpret_cast<void*>(signal_ucontext->uc_mcontext->__ss.__rip); -#else - return reinterpret_cast<void*>(signal_ucontext->uc_mcontext->ss.rip); -#endif -#endif - } -#elif defined(__akaros__) - auto* ctx = reinterpret_cast<struct user_context*>(vuc); - return reinterpret_cast<void*>(get_user_ctx_pc(ctx)); -#endif - static_cast<void>(vuc); - return nullptr; -} - -// The %p field width for printf() functions is two characters per byte, -// and two extra for the leading "0x". -static constexpr int kPrintfPointerFieldWidth = 2 + 2 * sizeof(void*); - -// Print a program counter, its stack frame size, and its symbol name. -// Note that there is a separate symbolize_pc argument. Return addresses may be -// at the end of the function, and this allows the caller to back up from pc if -// appropriate. -static void DumpPCAndFrameSizeAndSymbol(void (*writerfn)(const char*, void*), - void* writerfn_arg, void* pc, - void* symbolize_pc, int framesize, - const char* const prefix) { - char tmp[1024]; - const char* symbol = "(unknown)"; - if (absl::Symbolize(symbolize_pc, tmp, sizeof(tmp))) { - symbol = tmp; - } - char buf[1024]; - if (framesize <= 0) { - snprintf(buf, sizeof(buf), "%s@ %*p (unknown) %s\n", prefix, - kPrintfPointerFieldWidth, pc, symbol); - } else { - snprintf(buf, sizeof(buf), "%s@ %*p %9d %s\n", prefix, - kPrintfPointerFieldWidth, pc, framesize, symbol); - } - writerfn(buf, writerfn_arg); -} - -// Print a program counter and the corresponding stack frame size. -static void DumpPCAndFrameSize(void (*writerfn)(const char*, void*), - void* writerfn_arg, void* pc, int framesize, - const char* const prefix) { - char buf[100]; - if (framesize <= 0) { - snprintf(buf, sizeof(buf), "%s@ %*p (unknown)\n", prefix, - kPrintfPointerFieldWidth, pc); - } else { - snprintf(buf, sizeof(buf), "%s@ %*p %9d\n", prefix, - kPrintfPointerFieldWidth, pc, framesize); - } - writerfn(buf, writerfn_arg); -} - -void DumpPCAndFrameSizesAndStackTrace( - void* pc, void* const stack[], int frame_sizes[], int depth, - int min_dropped_frames, bool symbolize_stacktrace, - void (*writerfn)(const char*, void*), void* writerfn_arg) { - if (pc != nullptr) { - // We don't know the stack frame size for PC, use 0. - if (symbolize_stacktrace) { - DumpPCAndFrameSizeAndSymbol(writerfn, writerfn_arg, pc, pc, 0, "PC: "); - } else { - DumpPCAndFrameSize(writerfn, writerfn_arg, pc, 0, "PC: "); - } - } - for (int i = 0; i < depth; i++) { - if (symbolize_stacktrace) { - // Pass the previous address of pc as the symbol address because pc is a - // return address, and an overrun may occur when the function ends with a - // call to a function annotated noreturn (e.g. CHECK). Note that we don't - // do this for pc above, as the adjustment is only correct for return - // addresses. - DumpPCAndFrameSizeAndSymbol(writerfn, writerfn_arg, stack[i], - reinterpret_cast<char*>(stack[i]) - 1, - frame_sizes[i], " "); - } else { - DumpPCAndFrameSize(writerfn, writerfn_arg, stack[i], frame_sizes[i], - " "); - } - } - if (min_dropped_frames > 0) { - char buf[100]; - snprintf(buf, sizeof(buf), " @ ... and at least %d more frames\n", - min_dropped_frames); - writerfn(buf, writerfn_arg); - } -} - -} // namespace debugging_internal -ABSL_NAMESPACE_END -} // namespace absl diff --git a/third_party/abseil_cpp/absl/debugging/internal/examine_stack.h b/third_party/abseil_cpp/absl/debugging/internal/examine_stack.h deleted file mode 100644 index 393369131f1e..000000000000 --- a/third_party/abseil_cpp/absl/debugging/internal/examine_stack.h +++ /dev/null @@ -1,42 +0,0 @@ -// -// Copyright 2018 The Abseil Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// https://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. -// - -#ifndef ABSL_DEBUGGING_INTERNAL_EXAMINE_STACK_H_ -#define ABSL_DEBUGGING_INTERNAL_EXAMINE_STACK_H_ - -#include "absl/base/config.h" - -namespace absl { -ABSL_NAMESPACE_BEGIN -namespace debugging_internal { - -// Returns the program counter from signal context, or nullptr if -// unknown. `vuc` is a ucontext_t*. We use void* to avoid the use of -// ucontext_t on non-POSIX systems. -void* GetProgramCounter(void* vuc); - -// Uses `writerfn` to dump the program counter, stack trace, and stack -// frame sizes. -void DumpPCAndFrameSizesAndStackTrace( - void* pc, void* const stack[], int frame_sizes[], int depth, - int min_dropped_frames, bool symbolize_stacktrace, - void (*writerfn)(const char*, void*), void* writerfn_arg); - -} // namespace debugging_internal -ABSL_NAMESPACE_END -} // namespace absl - -#endif // ABSL_DEBUGGING_INTERNAL_EXAMINE_STACK_H_ diff --git a/third_party/abseil_cpp/absl/debugging/internal/stack_consumption.cc b/third_party/abseil_cpp/absl/debugging/internal/stack_consumption.cc deleted file mode 100644 index e3dd51c355ad..000000000000 --- a/third_party/abseil_cpp/absl/debugging/internal/stack_consumption.cc +++ /dev/null @@ -1,185 +0,0 @@ -// -// Copyright 2018 The Abseil Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// https://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -#include "absl/debugging/internal/stack_consumption.h" - -#ifdef ABSL_INTERNAL_HAVE_DEBUGGING_STACK_CONSUMPTION - -#include <signal.h> -#include <sys/mman.h> -#include <unistd.h> - -#include <string.h> - -#include "absl/base/attributes.h" -#include "absl/base/internal/raw_logging.h" - -namespace absl { -ABSL_NAMESPACE_BEGIN -namespace debugging_internal { -namespace { - -// This code requires that we know the direction in which the stack -// grows. It is commonly believed that this can be detected by putting -// a variable on the stack and then passing its address to a function -// that compares the address of this variable to the address of a -// variable on the function's own stack. However, this is unspecified -// behavior in C++: If two pointers p and q of the same type point to -// different objects that are not members of the same object or -// elements of the same array or to different functions, or if only -// one of them is null, the results of p<q, p>q, p<=q, and p>=q are -// unspecified. Therefore, instead we hardcode the direction of the -// stack on platforms we know about. -#if defined(__i386__) || defined(__x86_64__) || defined(__ppc__) || \ - defined(__aarch64__) -constexpr bool kStackGrowsDown = true; -#else -#error Need to define kStackGrowsDown -#endif - -// To measure the stack footprint of some code, we create a signal handler -// (for SIGUSR2 say) that exercises this code 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 code for it is exercised, consumes some -// stack already. We however only want the stack usage of the code inside the -// signal handler. To measure this accurately, we install two signal handlers: -// one that does nothing and just returns, and the user-provided signal -// handler. The difference between the stack consumption of these two signals -// handlers should give us the stack foorprint of interest. - -void EmptySignalHandler(int) {} - -// This is arbitrary value, and could be increase further, at the cost of -// memset()ting it all to known sentinel value. -constexpr int kAlternateStackSize = 64 << 10; // 64KiB - -constexpr int kSafetyMargin = 32; -constexpr 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. -// This function will return -1 if the alternate stack buffer has not been -// touched. It will abort the program if the buffer has overflowed or is about -// to overflow. -int GetStackConsumption(const void* const altstack) { - const char* begin; - int increment; - if (kStackGrowsDown) { - begin = reinterpret_cast<const char*>(altstack); - increment = 1; - } else { - begin = reinterpret_cast<const char*>(altstack) + kAlternateStackSize - 1; - increment = -1; - } - - for (int usage_count = kAlternateStackSize; usage_count > 0; --usage_count) { - if (*begin != kAlternateStackFillValue) { - ABSL_RAW_CHECK(usage_count <= kAlternateStackSize - kSafetyMargin, - "Buffer has overflowed or is about to overflow"); - return usage_count; - } - begin += increment; - } - - ABSL_RAW_LOG(FATAL, "Unreachable code"); - return -1; -} - -} // namespace - -int GetSignalHandlerStackConsumption(void (*signal_handler)(int)) { - // 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. - void* altstack = mmap(nullptr, kAlternateStackSize, PROT_READ | PROT_WRITE, - MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); - ABSL_RAW_CHECK(altstack != MAP_FAILED, "mmap() failed"); - - // Set up the alt-signal-stack (and save the older one). - stack_t sigstk; - memset(&sigstk, 0, sizeof(sigstk)); - sigstk.ss_sp = altstack; - sigstk.ss_size = kAlternateStackSize; - sigstk.ss_flags = 0; - stack_t old_sigstk; - memset(&old_sigstk, 0, sizeof(old_sigstk)); - ABSL_RAW_CHECK(sigaltstack(&sigstk, &old_sigstk) == 0, - "sigaltstack() failed"); - - // Set up SIGUSR1 and SIGUSR2 signal handlers (and save the older ones). - struct sigaction sa; - memset(&sa, 0, sizeof(sa)); - struct sigaction old_sa1, old_sa2; - sigemptyset(&sa.sa_mask); - sa.sa_flags = SA_ONSTACK; - - // SIGUSR1 maps to EmptySignalHandler. - sa.sa_handler = EmptySignalHandler; - ABSL_RAW_CHECK(sigaction(SIGUSR1, &sa, &old_sa1) == 0, "sigaction() failed"); - - // SIGUSR2 maps to signal_handler. - sa.sa_handler = signal_handler; - ABSL_RAW_CHECK(sigaction(SIGUSR2, &sa, &old_sa2) == 0, "sigaction() failed"); - - // Send SIGUSR1 signal and measure the stack consumption of the empty - // signal handler. - // The first signal might use more stack space. Run once and ignore the - // results to get that out of the way. - ABSL_RAW_CHECK(kill(getpid(), SIGUSR1) == 0, "kill() failed"); - - memset(altstack, kAlternateStackFillValue, kAlternateStackSize); - ABSL_RAW_CHECK(kill(getpid(), SIGUSR1) == 0, "kill() failed"); - int base_stack_consumption = GetStackConsumption(altstack); - - // Send SIGUSR2 signal and measure the stack consumption of signal_handler. - ABSL_RAW_CHECK(kill(getpid(), SIGUSR2) == 0, "kill() failed"); - int signal_handler_stack_consumption = GetStackConsumption(altstack); - - // Now restore the old alt-signal-stack and signal handlers. - if (old_sigstk.ss_sp == nullptr && old_sigstk.ss_size == 0 && - (old_sigstk.ss_flags & SS_DISABLE)) { - // https://git.musl-libc.org/cgit/musl/commit/src/signal/sigaltstack.c?id=7829f42a2c8944555439380498ab8b924d0f2070 - // The original stack has ss_size==0 and ss_flags==SS_DISABLE, but some - // versions of musl have a bug that rejects ss_size==0. Work around this by - // setting ss_size to MINSIGSTKSZ, which should be ignored by the kernel - // when SS_DISABLE is set. - old_sigstk.ss_size = MINSIGSTKSZ; - } - ABSL_RAW_CHECK(sigaltstack(&old_sigstk, nullptr) == 0, - "sigaltstack() failed"); - ABSL_RAW_CHECK(sigaction(SIGUSR1, &old_sa1, nullptr) == 0, - "sigaction() failed"); - ABSL_RAW_CHECK(sigaction(SIGUSR2, &old_sa2, nullptr) == 0, - "sigaction() failed"); - - ABSL_RAW_CHECK(munmap(altstack, kAlternateStackSize) == 0, "munmap() failed"); - if (signal_handler_stack_consumption != -1 && base_stack_consumption != -1) { - return signal_handler_stack_consumption - base_stack_consumption; - } - return -1; -} - -} // namespace debugging_internal -ABSL_NAMESPACE_END -} // namespace absl - -#endif // ABSL_INTERNAL_HAVE_DEBUGGING_STACK_CONSUMPTION diff --git a/third_party/abseil_cpp/absl/debugging/internal/stack_consumption.h b/third_party/abseil_cpp/absl/debugging/internal/stack_consumption.h deleted file mode 100644 index 2b5e7151667c..000000000000 --- a/third_party/abseil_cpp/absl/debugging/internal/stack_consumption.h +++ /dev/null @@ -1,50 +0,0 @@ -// -// Copyright 2018 The Abseil Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// https://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -// Helper function for measuring stack consumption of signal handlers. - -#ifndef ABSL_DEBUGGING_INTERNAL_STACK_CONSUMPTION_H_ -#define ABSL_DEBUGGING_INTERNAL_STACK_CONSUMPTION_H_ - -#include "absl/base/config.h" - -// The code in this module is not portable. -// Use this feature test macro to detect its availability. -#ifdef ABSL_INTERNAL_HAVE_DEBUGGING_STACK_CONSUMPTION -#error ABSL_INTERNAL_HAVE_DEBUGGING_STACK_CONSUMPTION cannot be set directly -#elif !defined(__APPLE__) && !defined(_WIN32) && \ - (defined(__i386__) || defined(__x86_64__) || defined(__ppc__) || \ - defined(__aarch64__)) -#define ABSL_INTERNAL_HAVE_DEBUGGING_STACK_CONSUMPTION 1 - -namespace absl { -ABSL_NAMESPACE_BEGIN -namespace debugging_internal { - -// Returns the stack consumption in bytes for the code exercised by -// signal_handler. To measure stack consumption, signal_handler is registered -// as a signal handler, so the code that it exercises must be async-signal -// safe. The argument of signal_handler is an implementation detail of signal -// handlers and should ignored by the code for signal_handler. Use global -// variables to pass information between your test code and signal_handler. -int GetSignalHandlerStackConsumption(void (*signal_handler)(int)); - -} // namespace debugging_internal -ABSL_NAMESPACE_END -} // namespace absl - -#endif // ABSL_INTERNAL_HAVE_DEBUGGING_STACK_CONSUMPTION - -#endif // ABSL_DEBUGGING_INTERNAL_STACK_CONSUMPTION_H_ diff --git a/third_party/abseil_cpp/absl/debugging/internal/stack_consumption_test.cc b/third_party/abseil_cpp/absl/debugging/internal/stack_consumption_test.cc deleted file mode 100644 index 80445bf43aab..000000000000 --- a/third_party/abseil_cpp/absl/debugging/internal/stack_consumption_test.cc +++ /dev/null @@ -1,50 +0,0 @@ -// -// Copyright 2018 The Abseil Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// https://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -#include "absl/debugging/internal/stack_consumption.h" - -#ifdef ABSL_INTERNAL_HAVE_DEBUGGING_STACK_CONSUMPTION - -#include <string.h> - -#include "gtest/gtest.h" -#include "absl/base/internal/raw_logging.h" - -namespace absl { -ABSL_NAMESPACE_BEGIN -namespace debugging_internal { -namespace { - -static void SimpleSignalHandler(int signo) { - char buf[100]; - memset(buf, 'a', sizeof(buf)); - - // Never true, but prevents compiler from optimizing buf out. - if (signo == 0) { - ABSL_RAW_LOG(INFO, "%p", static_cast<void*>(buf)); - } -} - -TEST(SignalHandlerStackConsumptionTest, MeasuresStackConsumption) { - // Our handler should consume reasonable number of bytes. - EXPECT_GE(GetSignalHandlerStackConsumption(SimpleSignalHandler), 100); -} - -} // namespace -} // namespace debugging_internal -ABSL_NAMESPACE_END -} // namespace absl - -#endif // ABSL_INTERNAL_HAVE_DEBUGGING_STACK_CONSUMPTION diff --git a/third_party/abseil_cpp/absl/debugging/internal/stacktrace_aarch64-inl.inc b/third_party/abseil_cpp/absl/debugging/internal/stacktrace_aarch64-inl.inc deleted file mode 100644 index f4859d7c210a..000000000000 --- a/third_party/abseil_cpp/absl/debugging/internal/stacktrace_aarch64-inl.inc +++ /dev/null @@ -1,199 +0,0 @@ -#ifndef ABSL_DEBUGGING_INTERNAL_STACKTRACE_AARCH64_INL_H_ -#define ABSL_DEBUGGING_INTERNAL_STACKTRACE_AARCH64_INL_H_ - -// Generate stack tracer for aarch64 - -#if defined(__linux__) -#include <sys/mman.h> -#include <ucontext.h> -#include <unistd.h> -#endif - -#include <atomic> -#include <cassert> -#include <cstdint> -#include <iostream> - -#include "absl/base/attributes.h" -#include "absl/debugging/internal/address_is_readable.h" -#include "absl/debugging/internal/vdso_support.h" // a no-op on non-elf or non-glibc systems -#include "absl/debugging/stacktrace.h" - -static const uintptr_t kUnknownFrameSize = 0; - -#if defined(__linux__) -// Returns the address of the VDSO __kernel_rt_sigreturn function, if present. -static const unsigned char* GetKernelRtSigreturnAddress() { - constexpr uintptr_t kImpossibleAddress = 1; - ABSL_CONST_INIT static std::atomic<uintptr_t> memoized{kImpossibleAddress}; - uintptr_t address = memoized.load(std::memory_order_relaxed); - if (address != kImpossibleAddress) { - return reinterpret_cast<const unsigned char*>(address); - } - - address = reinterpret_cast<uintptr_t>(nullptr); - -#ifdef ABSL_HAVE_VDSO_SUPPORT - absl::debugging_internal::VDSOSupport vdso; - if (vdso.IsPresent()) { - absl::debugging_internal::VDSOSupport::SymbolInfo symbol_info; - auto lookup = [&](int type) { - return vdso.LookupSymbol("__kernel_rt_sigreturn", "LINUX_2.6.39", type, - &symbol_info); - }; - if ((!lookup(STT_FUNC) && !lookup(STT_NOTYPE)) || - symbol_info.address == nullptr) { - // Unexpected: VDSO is present, yet the expected symbol is missing - // or null. - assert(false && "VDSO is present, but doesn't have expected symbol"); - } else { - if (reinterpret_cast<uintptr_t>(symbol_info.address) != - kImpossibleAddress) { - address = reinterpret_cast<uintptr_t>(symbol_info.address); - } else { - assert(false && "VDSO returned invalid address"); - } - } - } -#endif - - memoized.store(address, std::memory_order_relaxed); - return reinterpret_cast<const unsigned char*>(address); -} -#endif // __linux__ - -// Compute the size of a stack frame in [low..high). We assume that -// low < high. Return size of kUnknownFrameSize. -template<typename T> -static inline uintptr_t ComputeStackFrameSize(const T* low, - const T* high) { - const char* low_char_ptr = reinterpret_cast<const char *>(low); - const char* high_char_ptr = reinterpret_cast<const char *>(high); - return low < high ? high_char_ptr - low_char_ptr : kUnknownFrameSize; -} - -// 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, bool WITH_CONTEXT> -ABSL_ATTRIBUTE_NO_SANITIZE_ADDRESS // May read random elements from stack. -ABSL_ATTRIBUTE_NO_SANITIZE_MEMORY // May read random elements from stack. -static void **NextStackFrame(void **old_frame_pointer, const void *uc) { - void **new_frame_pointer = reinterpret_cast<void**>(*old_frame_pointer); - bool check_frame_size = true; - -#if defined(__linux__) - if (WITH_CONTEXT && uc != nullptr) { - // Check to see if next frame's return address is __kernel_rt_sigreturn. - if (old_frame_pointer[1] == GetKernelRtSigreturnAddress()) { - const ucontext_t *ucv = static_cast<const ucontext_t *>(uc); - // old_frame_pointer[0] is not suitable for unwinding, look at - // ucontext to discover frame pointer before signal. - void **const pre_signal_frame_pointer = - reinterpret_cast<void **>(ucv->uc_mcontext.regs[29]); - - // Check that alleged frame pointer is actually readable. This is to - // prevent "double fault" in case we hit the first fault due to e.g. - // stack corruption. - if (!absl::debugging_internal::AddressIsReadable( - pre_signal_frame_pointer)) - return nullptr; - - // Alleged frame pointer is readable, use it for further unwinding. - new_frame_pointer = pre_signal_frame_pointer; - - // Skip frame size check if we return from a signal. We may be using a - // an alternate stack for signals. - check_frame_size = false; - } - } -#endif - - // aarch64 ABI requires stack pointer to be 16-byte-aligned. - if ((reinterpret_cast<uintptr_t>(new_frame_pointer) & 15) != 0) - return nullptr; - - // Check frame size. In strict mode, we assume frames to be under - // 100,000 bytes. In non-strict mode, we relax the limit to 1MB. - if (check_frame_size) { - const uintptr_t max_size = STRICT_UNWINDING ? 100000 : 1000000; - const uintptr_t frame_size = - ComputeStackFrameSize(old_frame_pointer, new_frame_pointer); - if (frame_size == kUnknownFrameSize || frame_size > max_size) - return nullptr; - } - - return new_frame_pointer; -} - -template <bool IS_STACK_FRAMES, bool IS_WITH_CONTEXT> -ABSL_ATTRIBUTE_NO_SANITIZE_ADDRESS // May read random elements from stack. -ABSL_ATTRIBUTE_NO_SANITIZE_MEMORY // May read random elements from stack. -static int UnwindImpl(void** result, int* sizes, int max_depth, int skip_count, - const void *ucp, int *min_dropped_frames) { -#ifdef __GNUC__ - void **frame_pointer = reinterpret_cast<void**>(__builtin_frame_address(0)); -#else -# error reading stack point not yet supported on this platform. -#endif - - skip_count++; // Skip the frame for this function. - int n = 0; - - // The frame pointer points to low address of a frame. The first 64-bit - // word of a frame points to the next frame up the call chain, which normally - // is just after the high address of the current frame. The second word of - // a frame contains return adress of to the caller. To find a pc value - // associated with the current frame, we need to go down a level in the call - // chain. So we remember return the address of the last frame seen. This - // does not work for the first stack frame, which belongs to UnwindImp() but - // we skip the frame for UnwindImp() anyway. - void* prev_return_address = nullptr; - - while (frame_pointer && n < max_depth) { - // The absl::GetStackFrames routine is called when we are in some - // informational context (the failure signal handler for example). - // Use the non-strict unwinding rules to produce a stack trace - // that is as complete as possible (even if it contains a few bogus - // entries in some rare cases). - void **next_frame_pointer = - NextStackFrame<!IS_STACK_FRAMES, IS_WITH_CONTEXT>(frame_pointer, ucp); - - if (skip_count > 0) { - skip_count--; - } else { - result[n] = prev_return_address; - if (IS_STACK_FRAMES) { - sizes[n] = ComputeStackFrameSize(frame_pointer, next_frame_pointer); - } - n++; - } - prev_return_address = frame_pointer[1]; - frame_pointer = next_frame_pointer; - } - if (min_dropped_frames != nullptr) { - // Implementation detail: we clamp the max of frames we are willing to - // count, so as not to spend too much time in the loop below. - const int kMaxUnwind = 200; - int j = 0; - for (; frame_pointer != nullptr && j < kMaxUnwind; j++) { - frame_pointer = - NextStackFrame<!IS_STACK_FRAMES, IS_WITH_CONTEXT>(frame_pointer, ucp); - } - *min_dropped_frames = j; - } - return n; -} - -namespace absl { -ABSL_NAMESPACE_BEGIN -namespace debugging_internal { -bool StackTraceWorksForTest() { - return true; -} -} // namespace debugging_internal -ABSL_NAMESPACE_END -} // namespace absl - -#endif // ABSL_DEBUGGING_INTERNAL_STACKTRACE_AARCH64_INL_H_ diff --git a/third_party/abseil_cpp/absl/debugging/internal/stacktrace_arm-inl.inc b/third_party/abseil_cpp/absl/debugging/internal/stacktrace_arm-inl.inc deleted file mode 100644 index 2a1bf2e88694..000000000000 --- a/third_party/abseil_cpp/absl/debugging/internal/stacktrace_arm-inl.inc +++ /dev/null @@ -1,134 +0,0 @@ -// Copyright 2017 The Abseil Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// https://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. -// -// This is inspired by Craig Silverstein's PowerPC stacktrace code. - -#ifndef ABSL_DEBUGGING_INTERNAL_STACKTRACE_ARM_INL_H_ -#define ABSL_DEBUGGING_INTERNAL_STACKTRACE_ARM_INL_H_ - -#include <cstdint> - -#include "absl/debugging/stacktrace.h" - -// WARNING: -// This only works if all your code is in either ARM or THUMB mode. With -// interworking, the frame pointer of the caller can either be in r11 (ARM -// mode) or r7 (THUMB mode). A callee only saves the frame pointer of its -// mode in a fixed location on its stack frame. If the caller is a different -// mode, there is no easy way to find the frame pointer. It can either be -// still in the designated register or saved on stack along with other callee -// saved registers. - -// Given a pointer to a stack frame, locate and return the calling -// stackframe, or return nullptr 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[-1]; - - // 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 nullptr; - // Assume stack frames larger than 100,000 bytes are bogus. - if ((uintptr_t)new_sp - (uintptr_t)old_sp > 100000) return nullptr; - } else { - // In the non-strict mode, allow discontiguous stack frames. - // (alternate-signal-stacks for example). - if (new_sp == old_sp) return nullptr; - // And allow frames upto about 1MB. - if ((new_sp > old_sp) - && ((uintptr_t)new_sp - (uintptr_t)old_sp > 1000000)) return nullptr; - } - if ((uintptr_t)new_sp & (sizeof(void *) - 1)) return nullptr; - return new_sp; -} - -// This ensures that absl::GetStackTrace sets up the Link Register properly. -#ifdef __GNUC__ -void StacktraceArmDummyFunction() __attribute__((noinline)); -void StacktraceArmDummyFunction() { __asm__ volatile(""); } -#else -# error StacktraceArmDummyFunction() needs to be ported to this platform. -#endif - -template <bool IS_STACK_FRAMES, bool IS_WITH_CONTEXT> -static int UnwindImpl(void** result, int* sizes, int max_depth, int skip_count, - const void * /* ucp */, int *min_dropped_frames) { -#ifdef __GNUC__ - void **sp = reinterpret_cast<void**>(__builtin_frame_address(0)); -#else -# error reading stack point not yet supported on this platform. -#endif - - // On ARM, the return address is stored in the link register (r14). - // This is not saved on the stack frame of a leaf function. To - // simplify code that reads return addresses, we call a dummy - // function so that the return address of this function is also - // stored in the stack frame. This works at least for gcc. - StacktraceArmDummyFunction(); - - int n = 0; - while (sp && n < max_depth) { - // The absl::GetStackFrames routine is called when we are in some - // informational context (the failure signal handler for example). - // Use the non-strict unwinding rules to produce a stack trace - // that is as complete as possible (even if it contains a few bogus - // entries in some rare cases). - void **next_sp = NextStackFrame<!IS_STACK_FRAMES>(sp); - - if (skip_count > 0) { - skip_count--; - } else { - result[n] = *sp; - - if (IS_STACK_FRAMES) { - if (next_sp > sp) { - sizes[n] = (uintptr_t)next_sp - (uintptr_t)sp; - } else { - // A frame-size of 0 is used to indicate unknown frame size. - sizes[n] = 0; - } - } - n++; - } - sp = next_sp; - } - if (min_dropped_frames != nullptr) { - // Implementation detail: we clamp the max of frames we are willing to - // count, so as not to spend too much time in the loop below. - const int kMaxUnwind = 200; - int j = 0; - for (; sp != nullptr && j < kMaxUnwind; j++) { - sp = NextStackFrame<!IS_STACK_FRAMES>(sp); - } - *min_dropped_frames = j; - } - return n; -} - -namespace absl { -ABSL_NAMESPACE_BEGIN -namespace debugging_internal { -bool StackTraceWorksForTest() { - return false; -} -} // namespace debugging_internal -ABSL_NAMESPACE_END -} // namespace absl - -#endif // ABSL_DEBUGGING_INTERNAL_STACKTRACE_ARM_INL_H_ diff --git a/third_party/abseil_cpp/absl/debugging/internal/stacktrace_config.h b/third_party/abseil_cpp/absl/debugging/internal/stacktrace_config.h deleted file mode 100644 index 90af852818e7..000000000000 --- a/third_party/abseil_cpp/absl/debugging/internal/stacktrace_config.h +++ /dev/null @@ -1,89 +0,0 @@ -/* - * Copyright 2017 The Abseil Authors. - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * https://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - - * Defines ABSL_STACKTRACE_INL_HEADER to the *-inl.h containing - * actual unwinder implementation. - * This header is "private" to stacktrace.cc. - * DO NOT include it into any other files. -*/ -#ifndef ABSL_DEBUGGING_INTERNAL_STACKTRACE_CONFIG_H_ -#define ABSL_DEBUGGING_INTERNAL_STACKTRACE_CONFIG_H_ - -#if defined(ABSL_STACKTRACE_INL_HEADER) -#error ABSL_STACKTRACE_INL_HEADER cannot be directly set - -#elif defined(_WIN32) -#define ABSL_STACKTRACE_INL_HEADER \ - "absl/debugging/internal/stacktrace_win32-inl.inc" - -#elif defined(__APPLE__) -// Thread local support required for UnwindImpl. -// Notes: -// * Xcode's clang did not support `thread_local` until version 8, and -// even then not for all iOS < 9.0. -// * Xcode 9.3 started disallowing `thread_local` for 32-bit iOS simulator -// targeting iOS 9.x. -// * Xcode 10 moves the deployment target check for iOS < 9.0 to link time -// making __has_feature unreliable there. -// -// Otherwise, `__has_feature` is only supported by Clang so it has be inside -// `defined(__APPLE__)` check. -#if __has_feature(cxx_thread_local) && \ - !(TARGET_OS_IPHONE && __IPHONE_OS_VERSION_MIN_REQUIRED < __IPHONE_9_0) -#define ABSL_STACKTRACE_INL_HEADER \ - "absl/debugging/internal/stacktrace_generic-inl.inc" -#endif - -#elif defined(__linux__) && !defined(__ANDROID__) - -#if defined(NO_FRAME_POINTER) && \ - (defined(__i386__) || defined(__x86_64__) || defined(__aarch64__)) -// Note: The libunwind-based implementation is not available to open-source -// users. -#define ABSL_STACKTRACE_INL_HEADER \ - "absl/debugging/internal/stacktrace_libunwind-inl.inc" -#define STACKTRACE_USES_LIBUNWIND 1 -#elif defined(NO_FRAME_POINTER) && defined(__has_include) -#if __has_include(<execinfo.h>) -// Note: When using glibc this may require -funwind-tables to function properly. -#define ABSL_STACKTRACE_INL_HEADER \ - "absl/debugging/internal/stacktrace_generic-inl.inc" -#endif -#elif defined(__i386__) || defined(__x86_64__) -#define ABSL_STACKTRACE_INL_HEADER \ - "absl/debugging/internal/stacktrace_x86-inl.inc" -#elif defined(__ppc__) || defined(__PPC__) -#define ABSL_STACKTRACE_INL_HEADER \ - "absl/debugging/internal/stacktrace_powerpc-inl.inc" -#elif defined(__aarch64__) -#define ABSL_STACKTRACE_INL_HEADER \ - "absl/debugging/internal/stacktrace_aarch64-inl.inc" -#elif defined(__has_include) -#if __has_include(<execinfo.h>) -// Note: When using glibc this may require -funwind-tables to function properly. -#define ABSL_STACKTRACE_INL_HEADER \ - "absl/debugging/internal/stacktrace_generic-inl.inc" -#endif -#endif - -#endif - -// Fallback to the empty implementation. -#if !defined(ABSL_STACKTRACE_INL_HEADER) -#define ABSL_STACKTRACE_INL_HEADER \ - "absl/debugging/internal/stacktrace_unimplemented-inl.inc" -#endif - -#endif // ABSL_DEBUGGING_INTERNAL_STACKTRACE_CONFIG_H_ diff --git a/third_party/abseil_cpp/absl/debugging/internal/stacktrace_generic-inl.inc b/third_party/abseil_cpp/absl/debugging/internal/stacktrace_generic-inl.inc deleted file mode 100644 index b2792a1f3ada..000000000000 --- a/third_party/abseil_cpp/absl/debugging/internal/stacktrace_generic-inl.inc +++ /dev/null @@ -1,108 +0,0 @@ -// Copyright 2017 The Abseil Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// https://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. -// -// Portable implementation - just use glibc -// -// Note: The glibc implementation may cause a call to malloc. -// This can cause a deadlock in HeapProfiler. - -#ifndef ABSL_DEBUGGING_INTERNAL_STACKTRACE_GENERIC_INL_H_ -#define ABSL_DEBUGGING_INTERNAL_STACKTRACE_GENERIC_INL_H_ - -#include <execinfo.h> -#include <atomic> -#include <cstring> - -#include "absl/debugging/stacktrace.h" -#include "absl/base/attributes.h" - -// Sometimes, we can try to get a stack trace from within a stack -// trace, because we don't block signals inside this code (which would be too -// expensive: the two extra system calls per stack trace do matter here). -// That can cause a self-deadlock. -// Protect against such reentrant call by failing to get a stack trace. -// -// We use __thread here because the code here is extremely low level -- it is -// called while collecting stack traces from within malloc and mmap, and thus -// can not call anything which might call malloc or mmap itself. -static __thread int recursive = 0; - -// The stack trace function might be invoked very early in the program's -// execution (e.g. from the very first malloc if using tcmalloc). Also, the -// glibc implementation itself will trigger malloc the first time it is called. -// As such, we suppress usage of backtrace during this early stage of execution. -static std::atomic<bool> disable_stacktraces(true); // Disabled until healthy. -// Waiting until static initializers run seems to be late enough. -// This file is included into stacktrace.cc so this will only run once. -ABSL_ATTRIBUTE_UNUSED static int stacktraces_enabler = []() { - void* unused_stack[1]; - // Force the first backtrace to happen early to get the one-time shared lib - // loading (allocation) out of the way. After the first call it is much safer - // to use backtrace from a signal handler if we crash somewhere later. - backtrace(unused_stack, 1); - disable_stacktraces.store(false, std::memory_order_relaxed); - return 0; -}(); - -template <bool IS_STACK_FRAMES, bool IS_WITH_CONTEXT> -static int UnwindImpl(void** result, int* sizes, int max_depth, int skip_count, - const void *ucp, int *min_dropped_frames) { - if (recursive || disable_stacktraces.load(std::memory_order_relaxed)) { - return 0; - } - ++recursive; - - static_cast<void>(ucp); // Unused. - 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]; - - if (IS_STACK_FRAMES) { - // No implementation for finding out the stack frame sizes yet. - memset(sizes, 0, sizeof(*sizes) * result_count); - } - if (min_dropped_frames != nullptr) { - if (size - skip_count - max_depth > 0) { - *min_dropped_frames = size - skip_count - max_depth; - } else { - *min_dropped_frames = 0; - } - } - - --recursive; - - return result_count; -} - -namespace absl { -ABSL_NAMESPACE_BEGIN -namespace debugging_internal { -bool StackTraceWorksForTest() { - return true; -} -} // namespace debugging_internal -ABSL_NAMESPACE_END -} // namespace absl - -#endif // ABSL_DEBUGGING_INTERNAL_STACKTRACE_GENERIC_INL_H_ diff --git a/third_party/abseil_cpp/absl/debugging/internal/stacktrace_powerpc-inl.inc b/third_party/abseil_cpp/absl/debugging/internal/stacktrace_powerpc-inl.inc deleted file mode 100644 index 2e7c2f404f20..000000000000 --- a/third_party/abseil_cpp/absl/debugging/internal/stacktrace_powerpc-inl.inc +++ /dev/null @@ -1,248 +0,0 @@ -// Copyright 2017 The Abseil Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// https://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. -// -// Produce stack trace. I'm guessing (hoping!) the code is much like -// for x86. For apple machines, at least, it seems to be; see -// https://developer.apple.com/documentation/mac/runtimehtml/RTArch-59.html -// https://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 - -#ifndef ABSL_DEBUGGING_INTERNAL_STACKTRACE_POWERPC_INL_H_ -#define ABSL_DEBUGGING_INTERNAL_STACKTRACE_POWERPC_INL_H_ - -#if defined(__linux__) -#include <asm/ptrace.h> // for PT_NIP. -#include <ucontext.h> // for ucontext_t -#endif - -#include <unistd.h> -#include <cassert> -#include <cstdint> -#include <cstdio> - -#include "absl/base/attributes.h" -#include "absl/base/optimization.h" -#include "absl/base/port.h" -#include "absl/debugging/stacktrace.h" -#include "absl/debugging/internal/address_is_readable.h" -#include "absl/debugging/internal/vdso_support.h" // a no-op on non-elf or non-glibc systems - -// Given a stack pointer, return the saved link register value. -// Note that this is the link register for a callee. -static inline void *StacktracePowerPCGetLR(void **sp) { - // 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) - return *(sp+2); -#elif defined(_CALL_SYSV) - return *(sp+1); -#elif defined(__APPLE__) || defined(__FreeBSD__) || \ - (defined(__linux__) && defined(__PPC64__)) - // This check is in case the compiler doesn't define _CALL_AIX/etc. - return *(sp+2); -#elif defined(__linux) - // This check is in case the compiler doesn't define _CALL_SYSV. - return *(sp+1); -#else -#error Need to specify the PPC ABI for your archiecture. -#endif -} - -// 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, bool IS_WITH_CONTEXT> -ABSL_ATTRIBUTE_NO_SANITIZE_ADDRESS // May read random elements from stack. -ABSL_ATTRIBUTE_NO_SANITIZE_MEMORY // May read random elements from stack. -static void **NextStackFrame(void **old_sp, const void *uc) { - void **new_sp = (void **) *old_sp; - enum { kStackAlignment = 16 }; - - // 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 nullptr; - // Assume stack frames larger than 100,000 bytes are bogus. - if ((uintptr_t)new_sp - (uintptr_t)old_sp > 100000) return nullptr; - } else { - // In the non-strict mode, allow discontiguous stack frames. - // (alternate-signal-stacks for example). - if (new_sp == old_sp) return nullptr; - // And allow frames upto about 1MB. - if ((new_sp > old_sp) - && ((uintptr_t)new_sp - (uintptr_t)old_sp > 1000000)) return nullptr; - } - if ((uintptr_t)new_sp % kStackAlignment != 0) return nullptr; - -#if defined(__linux__) - enum StackTraceKernelSymbolStatus { - kNotInitialized = 0, kAddressValid, kAddressInvalid }; - - if (IS_WITH_CONTEXT && uc != nullptr) { - static StackTraceKernelSymbolStatus kernel_symbol_status = - kNotInitialized; // Sentinel: not computed yet. - // Initialize with sentinel value: __kernel_rt_sigtramp_rt64 can not - // possibly be there. - static const unsigned char *kernel_sigtramp_rt64_address = nullptr; - if (kernel_symbol_status == kNotInitialized) { - absl::debugging_internal::VDSOSupport vdso; - if (vdso.IsPresent()) { - absl::debugging_internal::VDSOSupport::SymbolInfo - sigtramp_rt64_symbol_info; - if (!vdso.LookupSymbol( - "__kernel_sigtramp_rt64", "LINUX_2.6.15", - absl::debugging_internal::VDSOSupport::kVDSOSymbolType, - &sigtramp_rt64_symbol_info) || - sigtramp_rt64_symbol_info.address == nullptr) { - // Unexpected: VDSO is present, yet the expected symbol is missing - // or null. - assert(false && "VDSO is present, but doesn't have expected symbol"); - kernel_symbol_status = kAddressInvalid; - } else { - kernel_sigtramp_rt64_address = - reinterpret_cast<const unsigned char *>( - sigtramp_rt64_symbol_info.address); - kernel_symbol_status = kAddressValid; - } - } else { - kernel_symbol_status = kAddressInvalid; - } - } - - if (new_sp != nullptr && - kernel_symbol_status == kAddressValid && - StacktracePowerPCGetLR(new_sp) == kernel_sigtramp_rt64_address) { - const ucontext_t* signal_context = - reinterpret_cast<const ucontext_t*>(uc); - void **const sp_before_signal = - reinterpret_cast<void**>(signal_context->uc_mcontext.gp_regs[PT_R1]); - // Check that alleged sp before signal is nonnull and is reasonably - // aligned. - if (sp_before_signal != nullptr && - ((uintptr_t)sp_before_signal % kStackAlignment) == 0) { - // Check that alleged stack pointer is actually readable. This is to - // prevent a "double fault" in case we hit the first fault due to e.g. - // a stack corruption. - if (absl::debugging_internal::AddressIsReadable(sp_before_signal)) { - // Alleged stack pointer is readable, use it for further unwinding. - new_sp = sp_before_signal; - } - } - } - } -#endif - - return new_sp; -} - -// This ensures that absl::GetStackTrace sets up the Link Register properly. -ABSL_ATTRIBUTE_NOINLINE static void AbslStacktracePowerPCDummyFunction() { - ABSL_BLOCK_TAIL_CALL_OPTIMIZATION(); -} - -template <bool IS_STACK_FRAMES, bool IS_WITH_CONTEXT> -ABSL_ATTRIBUTE_NO_SANITIZE_ADDRESS // May read random elements from stack. -ABSL_ATTRIBUTE_NO_SANITIZE_MEMORY // May read random elements from stack. -static int UnwindImpl(void** result, int* sizes, int max_depth, int skip_count, - const void *ucp, int *min_dropped_frames) { - void **sp; - // Apple macOS 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. - AbslStacktracePowerPCDummyFunction(); - - // The LR save area is used by the callee, so the top entry is bogus. - skip_count++; - - int n = 0; - - // Unlike ABIs of X86 and ARM, PowerPC ABIs say that return address (in - // the link register) of a function call is stored in the caller's stack - // frame instead of the callee's. When we look for the return address - // associated with a stack frame, we need to make sure that there is a - // caller frame before it. So we call NextStackFrame before entering the - // loop below and check next_sp instead of sp for loop termination. - // The outermost frame is set up by runtimes and it does not have a - // caller frame, so it is skipped. - - // The absl::GetStackFrames routine is called when we are in some - // informational context (the failure signal handler for example). - // Use the non-strict unwinding rules to produce a stack trace - // that is as complete as possible (even if it contains a few - // bogus entries in some rare cases). - void **next_sp = NextStackFrame<!IS_STACK_FRAMES, IS_WITH_CONTEXT>(sp, ucp); - - while (next_sp && n < max_depth) { - if (skip_count > 0) { - skip_count--; - } else { - result[n] = StacktracePowerPCGetLR(sp); - if (IS_STACK_FRAMES) { - if (next_sp > sp) { - sizes[n] = (uintptr_t)next_sp - (uintptr_t)sp; - } else { - // A frame-size of 0 is used to indicate unknown frame size. - sizes[n] = 0; - } - } - n++; - } - - sp = next_sp; - next_sp = NextStackFrame<!IS_STACK_FRAMES, IS_WITH_CONTEXT>(sp, ucp); - } - - if (min_dropped_frames != nullptr) { - // Implementation detail: we clamp the max of frames we are willing to - // count, so as not to spend too much time in the loop below. - const int kMaxUnwind = 1000; - int j = 0; - for (; next_sp != nullptr && j < kMaxUnwind; j++) { - next_sp = NextStackFrame<!IS_STACK_FRAMES, IS_WITH_CONTEXT>(next_sp, ucp); - } - *min_dropped_frames = j; - } - return n; -} - -namespace absl { -ABSL_NAMESPACE_BEGIN -namespace debugging_internal { -bool StackTraceWorksForTest() { - return true; -} -} // namespace debugging_internal -ABSL_NAMESPACE_END -} // namespace absl - -#endif // ABSL_DEBUGGING_INTERNAL_STACKTRACE_POWERPC_INL_H_ diff --git a/third_party/abseil_cpp/absl/debugging/internal/stacktrace_unimplemented-inl.inc b/third_party/abseil_cpp/absl/debugging/internal/stacktrace_unimplemented-inl.inc deleted file mode 100644 index 5b8fb191b65a..000000000000 --- a/third_party/abseil_cpp/absl/debugging/internal/stacktrace_unimplemented-inl.inc +++ /dev/null @@ -1,24 +0,0 @@ -#ifndef ABSL_DEBUGGING_INTERNAL_STACKTRACE_UNIMPLEMENTED_INL_H_ -#define ABSL_DEBUGGING_INTERNAL_STACKTRACE_UNIMPLEMENTED_INL_H_ - -template <bool IS_STACK_FRAMES, bool IS_WITH_CONTEXT> -static int UnwindImpl(void** /* result */, int* /* sizes */, - int /* max_depth */, int /* skip_count */, - const void* /* ucp */, int *min_dropped_frames) { - if (min_dropped_frames != nullptr) { - *min_dropped_frames = 0; - } - return 0; -} - -namespace absl { -ABSL_NAMESPACE_BEGIN -namespace debugging_internal { -bool StackTraceWorksForTest() { - return false; -} -} // namespace debugging_internal -ABSL_NAMESPACE_END -} // namespace absl - -#endif // ABSL_DEBUGGING_INTERNAL_STACKTRACE_UNIMPLEMENTED_INL_H_ diff --git a/third_party/abseil_cpp/absl/debugging/internal/stacktrace_win32-inl.inc b/third_party/abseil_cpp/absl/debugging/internal/stacktrace_win32-inl.inc deleted file mode 100644 index 1c666c8b561f..000000000000 --- a/third_party/abseil_cpp/absl/debugging/internal/stacktrace_win32-inl.inc +++ /dev/null @@ -1,93 +0,0 @@ -// Copyright 2017 The Abseil Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// https://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. -// -// Produces a stack trace for Windows. Normally, one could use -// stacktrace_x86-inl.h or stacktrace_x86_64-inl.h -- and indeed, that -// should work for binaries compiled using MSVC in "debug" mode. -// However, in "release" mode, Windows uses frame-pointer -// optimization, which makes getting a stack trace very difficult. -// -// There are several approaches one can take. One is to use Windows -// intrinsics like StackWalk64. These can work, but have restrictions -// on how successful they can be. Another attempt is to write a -// version of stacktrace_x86-inl.h that has heuristic support for -// dealing with FPO, similar to what WinDbg does (see -// http://www.nynaeve.net/?p=97). There are (non-working) examples of -// these approaches, complete with TODOs, in stacktrace_win32-inl.h#1 -// -// The solution we've ended up doing is to call the undocumented -// windows function RtlCaptureStackBackTrace, which probably doesn't -// work with FPO but at least is fast, and doesn't require a symbol -// server. -// -// This code is inspired by a patch from David Vitek: -// https://code.google.com/p/google-perftools/issues/detail?id=83 - -#ifndef ABSL_DEBUGGING_INTERNAL_STACKTRACE_WIN32_INL_H_ -#define ABSL_DEBUGGING_INTERNAL_STACKTRACE_WIN32_INL_H_ - -#include <windows.h> // for GetProcAddress and GetModuleHandle -#include <cassert> - -typedef USHORT NTAPI RtlCaptureStackBackTrace_Function( - IN ULONG frames_to_skip, - IN ULONG frames_to_capture, - OUT PVOID *backtrace, - OUT PULONG backtrace_hash); - -// It is not possible to load RtlCaptureStackBackTrace at static init time in -// UWP. CaptureStackBackTrace is the public version of RtlCaptureStackBackTrace -#if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_APP) && \ - !WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP) -static RtlCaptureStackBackTrace_Function* const RtlCaptureStackBackTrace_fn = - &::CaptureStackBackTrace; -#else -// Load the function we need at static init time, where we don't have -// to worry about someone else holding the loader's lock. -static RtlCaptureStackBackTrace_Function* const RtlCaptureStackBackTrace_fn = - (RtlCaptureStackBackTrace_Function*)GetProcAddress( - GetModuleHandleA("ntdll.dll"), "RtlCaptureStackBackTrace"); -#endif // WINAPI_PARTITION_APP && !WINAPI_PARTITION_DESKTOP - -template <bool IS_STACK_FRAMES, bool IS_WITH_CONTEXT> -static int UnwindImpl(void** result, int* sizes, int max_depth, int skip_count, - const void*, int* min_dropped_frames) { - int n = 0; - if (!RtlCaptureStackBackTrace_fn) { - // can't find a stacktrace with no function to call - } else { - n = (int)RtlCaptureStackBackTrace_fn(skip_count + 2, max_depth, result, 0); - } - if (IS_STACK_FRAMES) { - // No implementation for finding out the stack frame sizes yet. - memset(sizes, 0, sizeof(*sizes) * n); - } - if (min_dropped_frames != nullptr) { - // Not implemented. - *min_dropped_frames = 0; - } - return n; -} - -namespace absl { -ABSL_NAMESPACE_BEGIN -namespace debugging_internal { -bool StackTraceWorksForTest() { - return false; -} -} // namespace debugging_internal -ABSL_NAMESPACE_END -} // namespace absl - -#endif // ABSL_DEBUGGING_INTERNAL_STACKTRACE_WIN32_INL_H_ diff --git a/third_party/abseil_cpp/absl/debugging/internal/stacktrace_x86-inl.inc b/third_party/abseil_cpp/absl/debugging/internal/stacktrace_x86-inl.inc deleted file mode 100644 index bc320ff75bc5..000000000000 --- a/third_party/abseil_cpp/absl/debugging/internal/stacktrace_x86-inl.inc +++ /dev/null @@ -1,346 +0,0 @@ -// Copyright 2017 The Abseil Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// https://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. -// -// Produce stack trace - -#ifndef ABSL_DEBUGGING_INTERNAL_STACKTRACE_X86_INL_INC_ -#define ABSL_DEBUGGING_INTERNAL_STACKTRACE_X86_INL_INC_ - -#if defined(__linux__) && (defined(__i386__) || defined(__x86_64__)) -#include <ucontext.h> // for ucontext_t -#endif - -#if !defined(_WIN32) -#include <unistd.h> -#endif - -#include <cassert> -#include <cstdint> - -#include "absl/base/macros.h" -#include "absl/base/port.h" -#include "absl/debugging/internal/address_is_readable.h" -#include "absl/debugging/internal/vdso_support.h" // a no-op on non-elf or non-glibc systems -#include "absl/debugging/stacktrace.h" - -#include "absl/base/internal/raw_logging.h" - -using absl::debugging_internal::AddressIsReadable; - -#if defined(__linux__) && defined(__i386__) -// Count "push %reg" instructions in VDSO __kernel_vsyscall(), -// preceeding "syscall" or "sysenter". -// If __kernel_vsyscall uses frame pointer, answer 0. -// -// kMaxBytes tells how many instruction bytes of __kernel_vsyscall -// to analyze before giving up. Up to kMaxBytes+1 bytes of -// instructions could be accessed. -// -// Here are known __kernel_vsyscall instruction sequences: -// -// SYSENTER (linux-2.6.26/arch/x86/vdso/vdso32/sysenter.S). -// Used on Intel. -// 0xffffe400 <__kernel_vsyscall+0>: push %ecx -// 0xffffe401 <__kernel_vsyscall+1>: push %edx -// 0xffffe402 <__kernel_vsyscall+2>: push %ebp -// 0xffffe403 <__kernel_vsyscall+3>: mov %esp,%ebp -// 0xffffe405 <__kernel_vsyscall+5>: sysenter -// -// SYSCALL (see linux-2.6.26/arch/x86/vdso/vdso32/syscall.S). -// Used on AMD. -// 0xffffe400 <__kernel_vsyscall+0>: push %ebp -// 0xffffe401 <__kernel_vsyscall+1>: mov %ecx,%ebp -// 0xffffe403 <__kernel_vsyscall+3>: syscall -// - -// The sequence below isn't actually expected in Google fleet, -// here only for completeness. Remove this comment from OSS release. - -// i386 (see linux-2.6.26/arch/x86/vdso/vdso32/int80.S) -// 0xffffe400 <__kernel_vsyscall+0>: int $0x80 -// 0xffffe401 <__kernel_vsyscall+1>: ret -// -static const int kMaxBytes = 10; - -// We use assert()s instead of DCHECK()s -- this is too low level -// for DCHECK(). - -static int CountPushInstructions(const unsigned char *const addr) { - int result = 0; - for (int i = 0; i < kMaxBytes; ++i) { - if (addr[i] == 0x89) { - // "mov reg,reg" - if (addr[i + 1] == 0xE5) { - // Found "mov %esp,%ebp". - return 0; - } - ++i; // Skip register encoding byte. - } else if (addr[i] == 0x0F && - (addr[i + 1] == 0x34 || addr[i + 1] == 0x05)) { - // Found "sysenter" or "syscall". - return result; - } else if ((addr[i] & 0xF0) == 0x50) { - // Found "push %reg". - ++result; - } else if (addr[i] == 0xCD && addr[i + 1] == 0x80) { - // Found "int $0x80" - assert(result == 0); - return 0; - } else { - // Unexpected instruction. - assert(false && "unexpected instruction in __kernel_vsyscall"); - return 0; - } - } - // Unexpected: didn't find SYSENTER or SYSCALL in - // [__kernel_vsyscall, __kernel_vsyscall + kMaxBytes) interval. - assert(false && "did not find SYSENTER or SYSCALL in __kernel_vsyscall"); - return 0; -} -#endif - -// Assume stack frames larger than 100,000 bytes are bogus. -static const int kMaxFrameBytes = 100000; - -// Returns the stack frame pointer from signal context, 0 if unknown. -// vuc is a ucontext_t *. We use void* to avoid the use -// of ucontext_t on non-POSIX systems. -static uintptr_t GetFP(const void *vuc) { -#if !defined(__linux__) - static_cast<void>(vuc); // Avoid an unused argument compiler warning. -#else - if (vuc != nullptr) { - auto *uc = reinterpret_cast<const ucontext_t *>(vuc); -#if defined(__i386__) - const auto bp = uc->uc_mcontext.gregs[REG_EBP]; - const auto sp = uc->uc_mcontext.gregs[REG_ESP]; -#elif defined(__x86_64__) - const auto bp = uc->uc_mcontext.gregs[REG_RBP]; - const auto sp = uc->uc_mcontext.gregs[REG_RSP]; -#else - const uintptr_t bp = 0; - const uintptr_t sp = 0; -#endif - // Sanity-check that the base pointer is valid. It should be as long as - // SHRINK_WRAP_FRAME_POINTER is not set, but it's possible that some code in - // the process is compiled with --copt=-fomit-frame-pointer or - // --copt=-momit-leaf-frame-pointer. - // - // TODO(bcmills): -momit-leaf-frame-pointer is currently the default - // behavior when building with clang. Talk to the C++ toolchain team about - // fixing that. - if (bp >= sp && bp - sp <= kMaxFrameBytes) return bp; - - // If bp isn't a plausible frame pointer, return the stack pointer instead. - // If we're lucky, it points to the start of a stack frame; otherwise, we'll - // get one frame of garbage in the stack trace and fail the sanity check on - // the next iteration. - return sp; - } -#endif - return 0; -} - -// 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, bool WITH_CONTEXT> -ABSL_ATTRIBUTE_NO_SANITIZE_ADDRESS // May read random elements from stack. -ABSL_ATTRIBUTE_NO_SANITIZE_MEMORY // May read random elements from stack. -static void **NextStackFrame(void **old_fp, const void *uc) { - void **new_fp = (void **)*old_fp; - -#if defined(__linux__) && defined(__i386__) - if (WITH_CONTEXT && uc != nullptr) { - // How many "push %reg" instructions are there at __kernel_vsyscall? - // This is constant for a given kernel and processor, so compute - // it only once. - static int num_push_instructions = -1; // Sentinel: not computed yet. - // Initialize with sentinel value: __kernel_rt_sigreturn can not possibly - // be there. - static const unsigned char *kernel_rt_sigreturn_address = nullptr; - static const unsigned char *kernel_vsyscall_address = nullptr; - if (num_push_instructions == -1) { -#ifdef ABSL_HAVE_VDSO_SUPPORT - absl::debugging_internal::VDSOSupport vdso; - if (vdso.IsPresent()) { - absl::debugging_internal::VDSOSupport::SymbolInfo - rt_sigreturn_symbol_info; - absl::debugging_internal::VDSOSupport::SymbolInfo vsyscall_symbol_info; - if (!vdso.LookupSymbol("__kernel_rt_sigreturn", "LINUX_2.5", STT_FUNC, - &rt_sigreturn_symbol_info) || - !vdso.LookupSymbol("__kernel_vsyscall", "LINUX_2.5", STT_FUNC, - &vsyscall_symbol_info) || - rt_sigreturn_symbol_info.address == nullptr || - vsyscall_symbol_info.address == nullptr) { - // Unexpected: 32-bit VDSO is present, yet one of the expected - // symbols is missing or null. - assert(false && "VDSO is present, but doesn't have expected symbols"); - num_push_instructions = 0; - } else { - kernel_rt_sigreturn_address = - reinterpret_cast<const unsigned char *>( - rt_sigreturn_symbol_info.address); - kernel_vsyscall_address = - reinterpret_cast<const unsigned char *>( - vsyscall_symbol_info.address); - num_push_instructions = - CountPushInstructions(kernel_vsyscall_address); - } - } else { - num_push_instructions = 0; - } -#else // ABSL_HAVE_VDSO_SUPPORT - num_push_instructions = 0; -#endif // ABSL_HAVE_VDSO_SUPPORT - } - if (num_push_instructions != 0 && kernel_rt_sigreturn_address != nullptr && - old_fp[1] == kernel_rt_sigreturn_address) { - const ucontext_t *ucv = static_cast<const ucontext_t *>(uc); - // This kernel does not use frame pointer in its VDSO code, - // and so %ebp is not suitable for unwinding. - void **const reg_ebp = - reinterpret_cast<void **>(ucv->uc_mcontext.gregs[REG_EBP]); - const unsigned char *const reg_eip = - reinterpret_cast<unsigned char *>(ucv->uc_mcontext.gregs[REG_EIP]); - if (new_fp == reg_ebp && kernel_vsyscall_address <= reg_eip && - reg_eip - kernel_vsyscall_address < kMaxBytes) { - // We "stepped up" to __kernel_vsyscall, but %ebp is not usable. - // Restore from 'ucv' instead. - void **const reg_esp = - reinterpret_cast<void **>(ucv->uc_mcontext.gregs[REG_ESP]); - // Check that alleged %esp is not null and is reasonably aligned. - if (reg_esp && - ((uintptr_t)reg_esp & (sizeof(reg_esp) - 1)) == 0) { - // Check that alleged %esp is actually readable. This is to prevent - // "double fault" in case we hit the first fault due to e.g. stack - // corruption. - void *const reg_esp2 = reg_esp[num_push_instructions - 1]; - if (AddressIsReadable(reg_esp2)) { - // Alleged %esp is readable, use it for further unwinding. - new_fp = reinterpret_cast<void **>(reg_esp2); - } - } - } - } - } -#endif - - const uintptr_t old_fp_u = reinterpret_cast<uintptr_t>(old_fp); - const uintptr_t new_fp_u = reinterpret_cast<uintptr_t>(new_fp); - - // Check that the transition from frame pointer old_fp to frame - // pointer new_fp isn't clearly bogus. Skip the checks if new_fp - // matches the signal context, so that we don't skip out early when - // using an alternate signal stack. - // - // TODO(bcmills): The GetFP call should be completely unnecessary when - // SHRINK_WRAP_FRAME_POINTER is set (because we should be back in the thread's - // stack by this point), but it is empirically still needed (e.g. when the - // stack includes a call to abort). unw_get_reg returns UNW_EBADREG for some - // frames. Figure out why GetValidFrameAddr and/or libunwind isn't doing what - // it's supposed to. - if (STRICT_UNWINDING && - (!WITH_CONTEXT || uc == nullptr || new_fp_u != GetFP(uc))) { - // With the stack growing downwards, older stack frame must be - // at a greater address that the current one. - if (new_fp_u <= old_fp_u) return nullptr; - if (new_fp_u - old_fp_u > kMaxFrameBytes) return nullptr; - } else { - if (new_fp == nullptr) return nullptr; // skip AddressIsReadable() below - // In the non-strict mode, allow discontiguous stack frames. - // (alternate-signal-stacks for example). - if (new_fp == old_fp) return nullptr; - } - - if (new_fp_u & (sizeof(void *) - 1)) return nullptr; -#ifdef __i386__ - // On 32-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 (new_fp_u >= 0xffffe000) return nullptr; -#endif -#if !defined(_WIN32) - 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_fp 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. - - if (!AddressIsReadable(new_fp)) { - return nullptr; - } - } -#endif - return new_fp; -} - -template <bool IS_STACK_FRAMES, bool IS_WITH_CONTEXT> -ABSL_ATTRIBUTE_NO_SANITIZE_ADDRESS // May read random elements from stack. -ABSL_ATTRIBUTE_NO_SANITIZE_MEMORY // May read random elements from stack. -ABSL_ATTRIBUTE_NOINLINE -static int UnwindImpl(void **result, int *sizes, int max_depth, int skip_count, - const void *ucp, int *min_dropped_frames) { - int n = 0; - void **fp = reinterpret_cast<void **>(__builtin_frame_address(0)); - - while (fp && n < max_depth) { - if (*(fp + 1) == reinterpret_cast<void *>(0)) { - // In 64-bit code, we often see a frame that - // points to itself and has a return address of 0. - break; - } - void **next_fp = NextStackFrame<!IS_STACK_FRAMES, IS_WITH_CONTEXT>(fp, ucp); - if (skip_count > 0) { - skip_count--; - } else { - result[n] = *(fp + 1); - if (IS_STACK_FRAMES) { - if (next_fp > fp) { - sizes[n] = (uintptr_t)next_fp - (uintptr_t)fp; - } else { - // A frame-size of 0 is used to indicate unknown frame size. - sizes[n] = 0; - } - } - n++; - } - fp = next_fp; - } - if (min_dropped_frames != nullptr) { - // Implementation detail: we clamp the max of frames we are willing to - // count, so as not to spend too much time in the loop below. - const int kMaxUnwind = 1000; - int j = 0; - for (; fp != nullptr && j < kMaxUnwind; j++) { - fp = NextStackFrame<!IS_STACK_FRAMES, IS_WITH_CONTEXT>(fp, ucp); - } - *min_dropped_frames = j; - } - return n; -} - -namespace absl { -ABSL_NAMESPACE_BEGIN -namespace debugging_internal { -bool StackTraceWorksForTest() { - return true; -} -} // namespace debugging_internal -ABSL_NAMESPACE_END -} // namespace absl - -#endif // ABSL_DEBUGGING_INTERNAL_STACKTRACE_X86_INL_INC_ diff --git a/third_party/abseil_cpp/absl/debugging/internal/symbolize.h b/third_party/abseil_cpp/absl/debugging/internal/symbolize.h deleted file mode 100644 index 4f26130fbb71..000000000000 --- a/third_party/abseil_cpp/absl/debugging/internal/symbolize.h +++ /dev/null @@ -1,147 +0,0 @@ -// Copyright 2018 The Abseil Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// https://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -// This file contains internal parts of the Abseil symbolizer. -// Do not depend on the anything in this file, it may change at anytime. - -#ifndef ABSL_DEBUGGING_INTERNAL_SYMBOLIZE_H_ -#define ABSL_DEBUGGING_INTERNAL_SYMBOLIZE_H_ - -#ifdef __cplusplus - -#include <cstddef> -#include <cstdint> - -#include "absl/base/config.h" -#include "absl/strings/string_view.h" - -#ifdef ABSL_INTERNAL_HAVE_ELF_SYMBOLIZE -#error ABSL_INTERNAL_HAVE_ELF_SYMBOLIZE cannot be directly set -#elif defined(__ELF__) && defined(__GLIBC__) && !defined(__native_client__) && \ - !defined(__asmjs__) && !defined(__wasm__) -#define ABSL_INTERNAL_HAVE_ELF_SYMBOLIZE 1 - -#include <elf.h> -#include <link.h> // For ElfW() macro. -#include <functional> -#include <string> - -namespace absl { -ABSL_NAMESPACE_BEGIN -namespace debugging_internal { - -// Iterates over all sections, invoking callback on each with the section name -// and the section header. -// -// Returns true on success; otherwise returns false in case of errors. -// -// This is not async-signal-safe. -bool ForEachSection(int fd, - const std::function<bool(absl::string_view name, - const ElfW(Shdr) &)>& callback); - -// 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); - -} // namespace debugging_internal -ABSL_NAMESPACE_END -} // namespace absl - -#endif // ABSL_INTERNAL_HAVE_ELF_SYMBOLIZE - -#ifdef ABSL_INTERNAL_HAVE_DARWIN_SYMBOLIZE -#error ABSL_INTERNAL_HAVE_DARWIN_SYMBOLIZE cannot be directly set -#elif defined(__APPLE__) -#define ABSL_INTERNAL_HAVE_DARWIN_SYMBOLIZE 1 -#endif - -namespace absl { -ABSL_NAMESPACE_BEGIN -namespace debugging_internal { - -struct SymbolDecoratorArgs { - // The program counter we are getting symbolic name for. - const void *pc; - // 0 for main executable, load address for shared libraries. - ptrdiff_t relocation; - // Read-only file descriptor for ELF image covering "pc", - // or -1 if no such ELF image exists in /proc/self/maps. - int fd; - // Output buffer, size. - // Note: the buffer may not be empty -- default symbolizer may have already - // produced some output, and earlier decorators may have adorned it in - // some way. You are free to replace or augment the contents (within the - // symbol_buf_size limit). - char *const symbol_buf; - size_t symbol_buf_size; - // Temporary scratch space, size. - // Use that space in preference to allocating your own stack buffer to - // conserve stack. - char *const tmp_buf; - size_t tmp_buf_size; - // User-provided argument - void* arg; -}; -using SymbolDecorator = void (*)(const SymbolDecoratorArgs *); - -// Installs a function-pointer as a decorator. Returns a value less than zero -// if the system cannot install the decorator. Otherwise, returns a unique -// identifier corresponding to the decorator. This identifier can be used to -// uninstall the decorator - See RemoveSymbolDecorator() below. -int InstallSymbolDecorator(SymbolDecorator decorator, void* arg); - -// Removes a previously installed function-pointer decorator. Parameter "ticket" -// is the return-value from calling InstallSymbolDecorator(). -bool RemoveSymbolDecorator(int ticket); - -// Remove all installed decorators. Returns true if successful, false if -// symbolization is currently in progress. -bool RemoveAllSymbolDecorators(void); - -// Registers an address range to a file mapping. -// -// Preconditions: -// start <= end -// filename != nullptr -// -// Returns true if the file was successfully registered. -bool RegisterFileMappingHint(const void* start, const void* end, - uint64_t offset, const char* filename); - -// Looks up the file mapping registered by RegisterFileMappingHint for an -// address range. If there is one, the file name is stored in *filename and -// *start and *end are modified to reflect the registered mapping. Returns -// whether any hint was found. -bool GetFileMappingHint(const void** start, const void** end, uint64_t* offset, - const char** filename); - -} // namespace debugging_internal -ABSL_NAMESPACE_END -} // namespace absl - -#endif // __cplusplus - -#include <stdbool.h> - -#ifdef __cplusplus -extern "C" -#endif // __cplusplus - - bool - AbslInternalGetFileMappingHint(const void** start, const void** end, - uint64_t* offset, const char** filename); - -#endif // ABSL_DEBUGGING_INTERNAL_SYMBOLIZE_H_ diff --git a/third_party/abseil_cpp/absl/debugging/internal/vdso_support.cc b/third_party/abseil_cpp/absl/debugging/internal/vdso_support.cc deleted file mode 100644 index 6be16d907275..000000000000 --- a/third_party/abseil_cpp/absl/debugging/internal/vdso_support.cc +++ /dev/null @@ -1,173 +0,0 @@ -// Copyright 2017 The Abseil Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// https://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -// Allow dynamic symbol lookup in the kernel VDSO page. -// -// VDSOSupport -- a class representing kernel VDSO (if present). - -#include "absl/debugging/internal/vdso_support.h" - -#ifdef ABSL_HAVE_VDSO_SUPPORT // defined in vdso_support.h - -#include <errno.h> -#include <fcntl.h> -#include <sys/syscall.h> -#include <unistd.h> - -#if __GLIBC_PREREQ(2, 16) // GLIBC-2.16 implements getauxval. -#include <sys/auxv.h> -#endif - -#include "absl/base/dynamic_annotations.h" -#include "absl/base/internal/raw_logging.h" -#include "absl/base/port.h" - -#ifndef AT_SYSINFO_EHDR -#define AT_SYSINFO_EHDR 33 // for crosstoolv10 -#endif - -namespace absl { -ABSL_NAMESPACE_BEGIN -namespace debugging_internal { - -ABSL_CONST_INIT -std::atomic<const void *> VDSOSupport::vdso_base_( - debugging_internal::ElfMemImage::kInvalidBase); - -std::atomic<VDSOSupport::GetCpuFn> VDSOSupport::getcpu_fn_(&InitAndGetCPU); -VDSOSupport::VDSOSupport() - // If vdso_base_ is still set to kInvalidBase, we got here - // before VDSOSupport::Init has been called. Call it now. - : image_(vdso_base_.load(std::memory_order_relaxed) == - debugging_internal::ElfMemImage::kInvalidBase - ? Init() - : vdso_base_.load(std::memory_order_relaxed)) {} - -// NOTE: we can't use GoogleOnceInit() below, because we can be -// called by tcmalloc, and none of the *once* stuff may be functional yet. -// -// In addition, we hope that the VDSOSupportHelper constructor -// causes this code to run before there are any threads, and before -// InitGoogle() has executed any chroot or setuid calls. -// -// Finally, even if there is a race here, it is harmless, because -// the operation should be idempotent. -const void *VDSOSupport::Init() { - const auto kInvalidBase = debugging_internal::ElfMemImage::kInvalidBase; -#if __GLIBC_PREREQ(2, 16) - if (vdso_base_.load(std::memory_order_relaxed) == kInvalidBase) { - errno = 0; - const void *const sysinfo_ehdr = - reinterpret_cast<const void *>(getauxval(AT_SYSINFO_EHDR)); - if (errno == 0) { - vdso_base_.store(sysinfo_ehdr, std::memory_order_relaxed); - } - } -#endif // __GLIBC_PREREQ(2, 16) - if (vdso_base_.load(std::memory_order_relaxed) == kInvalidBase) { - int fd = open("/proc/self/auxv", O_RDONLY); - if (fd == -1) { - // Kernel too old to have a VDSO. - vdso_base_.store(nullptr, std::memory_order_relaxed); - getcpu_fn_.store(&GetCPUViaSyscall, std::memory_order_relaxed); - return nullptr; - } - ElfW(auxv_t) aux; - while (read(fd, &aux, sizeof(aux)) == sizeof(aux)) { - if (aux.a_type == AT_SYSINFO_EHDR) { - vdso_base_.store(reinterpret_cast<void *>(aux.a_un.a_val), - std::memory_order_relaxed); - break; - } - } - close(fd); - if (vdso_base_.load(std::memory_order_relaxed) == kInvalidBase) { - // Didn't find AT_SYSINFO_EHDR in auxv[]. - vdso_base_.store(nullptr, std::memory_order_relaxed); - } - } - GetCpuFn fn = &GetCPUViaSyscall; // default if VDSO not present. - if (vdso_base_.load(std::memory_order_relaxed)) { - VDSOSupport vdso; - SymbolInfo info; - if (vdso.LookupSymbol("__vdso_getcpu", "LINUX_2.6", STT_FUNC, &info)) { - fn = reinterpret_cast<GetCpuFn>(const_cast<void *>(info.address)); - } - } - // Subtle: this code runs outside of any locks; prevent compiler - // from assigning to getcpu_fn_ more than once. - getcpu_fn_.store(fn, std::memory_order_relaxed); - return vdso_base_.load(std::memory_order_relaxed); -} - -const void *VDSOSupport::SetBase(const void *base) { - ABSL_RAW_CHECK(base != debugging_internal::ElfMemImage::kInvalidBase, - "internal error"); - const void *old_base = vdso_base_.load(std::memory_order_relaxed); - vdso_base_.store(base, std::memory_order_relaxed); - image_.Init(base); - // Also reset getcpu_fn_, so GetCPU could be tested with simulated VDSO. - getcpu_fn_.store(&InitAndGetCPU, std::memory_order_relaxed); - return old_base; -} - -bool VDSOSupport::LookupSymbol(const char *name, - const char *version, - int type, - SymbolInfo *info) const { - return image_.LookupSymbol(name, version, type, info); -} - -bool VDSOSupport::LookupSymbolByAddress(const void *address, - SymbolInfo *info_out) const { - return image_.LookupSymbolByAddress(address, info_out); -} - -// NOLINT on 'long' because this routine mimics kernel api. -long VDSOSupport::GetCPUViaSyscall(unsigned *cpu, // NOLINT(runtime/int) - void *, void *) { -#ifdef SYS_getcpu - return syscall(SYS_getcpu, cpu, nullptr, nullptr); -#else - // x86_64 never implemented sys_getcpu(), except as a VDSO call. - static_cast<void>(cpu); // Avoid an unused argument compiler warning. - errno = ENOSYS; - return -1; -#endif -} - -// Use fast __vdso_getcpu if available. -long VDSOSupport::InitAndGetCPU(unsigned *cpu, // NOLINT(runtime/int) - void *x, void *y) { - Init(); - GetCpuFn fn = getcpu_fn_.load(std::memory_order_relaxed); - ABSL_RAW_CHECK(fn != &InitAndGetCPU, "Init() did not set getcpu_fn_"); - return (*fn)(cpu, x, y); -} - -// This function must be very fast, and may be called from very -// low level (e.g. tcmalloc). Hence I avoid things like -// GoogleOnceInit() and ::operator new. -ABSL_ATTRIBUTE_NO_SANITIZE_MEMORY -int GetCPU() { - unsigned cpu; - int ret_code = (*VDSOSupport::getcpu_fn_)(&cpu, nullptr, nullptr); - return ret_code == 0 ? cpu : ret_code; -} - -} // namespace debugging_internal -ABSL_NAMESPACE_END -} // namespace absl - -#endif // ABSL_HAVE_VDSO_SUPPORT diff --git a/third_party/abseil_cpp/absl/debugging/internal/vdso_support.h b/third_party/abseil_cpp/absl/debugging/internal/vdso_support.h deleted file mode 100644 index 6562c6c2350a..000000000000 --- a/third_party/abseil_cpp/absl/debugging/internal/vdso_support.h +++ /dev/null @@ -1,158 +0,0 @@ -// -// Copyright 2017 The Abseil Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// https://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. -// - -// Allow dynamic symbol lookup in the kernel VDSO page. -// -// VDSO stands for "Virtual Dynamic Shared Object" -- a page of -// executable code, which looks like a shared library, but doesn't -// necessarily exist anywhere on disk, and which gets mmap()ed into -// every process by kernels which support VDSO, such as 2.6.x for 32-bit -// executables, and 2.6.24 and above for 64-bit executables. -// -// More details could be found here: -// http://www.trilithium.com/johan/2005/08/linux-gate/ -// -// VDSOSupport -- a class representing kernel VDSO (if present). -// -// Example usage: -// VDSOSupport vdso; -// VDSOSupport::SymbolInfo info; -// typedef (*FN)(unsigned *, void *, void *); -// FN fn = nullptr; -// if (vdso.LookupSymbol("__vdso_getcpu", "LINUX_2.6", STT_FUNC, &info)) { -// fn = reinterpret_cast<FN>(info.address); -// } - -#ifndef ABSL_DEBUGGING_INTERNAL_VDSO_SUPPORT_H_ -#define ABSL_DEBUGGING_INTERNAL_VDSO_SUPPORT_H_ - -#include <atomic> - -#include "absl/base/attributes.h" -#include "absl/debugging/internal/elf_mem_image.h" - -#ifdef ABSL_HAVE_ELF_MEM_IMAGE - -#ifdef ABSL_HAVE_VDSO_SUPPORT -#error ABSL_HAVE_VDSO_SUPPORT cannot be directly set -#else -#define ABSL_HAVE_VDSO_SUPPORT 1 -#endif - -namespace absl { -ABSL_NAMESPACE_BEGIN -namespace debugging_internal { - -// NOTE: this class may be used from within tcmalloc, and can not -// use any memory allocation routines. -class VDSOSupport { - public: - VDSOSupport(); - - typedef ElfMemImage::SymbolInfo SymbolInfo; - typedef ElfMemImage::SymbolIterator SymbolIterator; - - // On PowerPC64 VDSO symbols can either be of type STT_FUNC or STT_NOTYPE - // depending on how the kernel is built. The kernel is normally built with - // STT_NOTYPE type VDSO symbols. Let's make things simpler first by using a - // compile-time constant. -#ifdef __powerpc64__ - enum { kVDSOSymbolType = STT_NOTYPE }; -#else - enum { kVDSOSymbolType = STT_FUNC }; -#endif - - // Answers whether we have a vdso at all. - bool IsPresent() const { return image_.IsPresent(); } - - // Allow to iterate over all VDSO symbols. - SymbolIterator begin() const { return image_.begin(); } - SymbolIterator end() const { return image_.end(); } - - // Look up versioned dynamic symbol in the kernel VDSO. - // Returns false if VDSO is not present, or doesn't contain given - // symbol/version/type combination. - // If info_out != nullptr, additional details are filled in. - bool LookupSymbol(const char *name, const char *version, - int symbol_type, SymbolInfo *info_out) const; - - // Find info about symbol (if any) which overlaps given address. - // Returns true if symbol was found; false if VDSO isn't present - // or doesn't have a symbol overlapping given address. - // If info_out != nullptr, additional details are filled in. - bool LookupSymbolByAddress(const void *address, SymbolInfo *info_out) const; - - // Used only for testing. Replace real VDSO base with a mock. - // Returns previous value of vdso_base_. After you are done testing, - // you are expected to call SetBase() with previous value, in order to - // reset state to the way it was. - const void *SetBase(const void *s); - - // Computes vdso_base_ and returns it. Should be called as early as - // possible; before any thread creation, chroot or setuid. - static const void *Init(); - - private: - // image_ represents VDSO ELF image in memory. - // image_.ehdr_ == nullptr implies there is no VDSO. - ElfMemImage image_; - - // Cached value of auxv AT_SYSINFO_EHDR, computed once. - // This is a tri-state: - // kInvalidBase => value hasn't been determined yet. - // 0 => there is no VDSO. - // else => vma of VDSO Elf{32,64}_Ehdr. - // - // When testing with mock VDSO, low bit is set. - // The low bit is always available because vdso_base_ is - // page-aligned. - static std::atomic<const void *> vdso_base_; - - // NOLINT on 'long' because these routines mimic kernel api. - // The 'cache' parameter may be used by some versions of the kernel, - // and should be nullptr or point to a static buffer containing at - // least two 'long's. - static long InitAndGetCPU(unsigned *cpu, void *cache, // NOLINT 'long'. - void *unused); - static long GetCPUViaSyscall(unsigned *cpu, void *cache, // NOLINT 'long'. - void *unused); - typedef long (*GetCpuFn)(unsigned *cpu, void *cache, // NOLINT 'long'. - void *unused); - - // This function pointer may point to InitAndGetCPU, - // GetCPUViaSyscall, or __vdso_getcpu at different stages of initialization. - ABSL_CONST_INIT static std::atomic<GetCpuFn> getcpu_fn_; - - friend int GetCPU(void); // Needs access to getcpu_fn_. - - VDSOSupport(const VDSOSupport&) = delete; - VDSOSupport& operator=(const VDSOSupport&) = delete; -}; - -// Same as sched_getcpu() on later glibc versions. -// Return current CPU, using (fast) __vdso_getcpu@LINUX_2.6 if present, -// otherwise use syscall(SYS_getcpu,...). -// May return -1 with errno == ENOSYS if the kernel doesn't -// support SYS_getcpu. -int GetCPU(); - -} // namespace debugging_internal -ABSL_NAMESPACE_END -} // namespace absl - -#endif // ABSL_HAVE_ELF_MEM_IMAGE - -#endif // ABSL_DEBUGGING_INTERNAL_VDSO_SUPPORT_H_ diff --git a/third_party/abseil_cpp/absl/debugging/leak_check.cc b/third_party/abseil_cpp/absl/debugging/leak_check.cc deleted file mode 100644 index ff9049559d4d..000000000000 --- a/third_party/abseil_cpp/absl/debugging/leak_check.cc +++ /dev/null @@ -1,53 +0,0 @@ -// Copyright 2017 The Abseil Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// https://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -// Wrappers around lsan_interface functions. -// When lsan is not linked in, these functions are not available, -// therefore Abseil code which depends on these functions is conditioned on the -// definition of LEAK_SANITIZER. -#include "absl/debugging/leak_check.h" - -#ifndef LEAK_SANITIZER - -namespace absl { -ABSL_NAMESPACE_BEGIN -bool HaveLeakSanitizer() { return false; } -void DoIgnoreLeak(const void*) { } -void RegisterLivePointers(const void*, size_t) { } -void UnRegisterLivePointers(const void*, size_t) { } -LeakCheckDisabler::LeakCheckDisabler() { } -LeakCheckDisabler::~LeakCheckDisabler() { } -ABSL_NAMESPACE_END -} // namespace absl - -#else - -#include <sanitizer/lsan_interface.h> - -namespace absl { -ABSL_NAMESPACE_BEGIN -bool HaveLeakSanitizer() { return true; } -void DoIgnoreLeak(const void* ptr) { __lsan_ignore_object(ptr); } -void RegisterLivePointers(const void* ptr, size_t size) { - __lsan_register_root_region(ptr, size); -} -void UnRegisterLivePointers(const void* ptr, size_t size) { - __lsan_unregister_root_region(ptr, size); -} -LeakCheckDisabler::LeakCheckDisabler() { __lsan_disable(); } -LeakCheckDisabler::~LeakCheckDisabler() { __lsan_enable(); } -ABSL_NAMESPACE_END -} // namespace absl - -#endif // LEAK_SANITIZER diff --git a/third_party/abseil_cpp/absl/debugging/leak_check.h b/third_party/abseil_cpp/absl/debugging/leak_check.h deleted file mode 100644 index 7a5a22dd1caf..000000000000 --- a/third_party/abseil_cpp/absl/debugging/leak_check.h +++ /dev/null @@ -1,113 +0,0 @@ -// Copyright 2018 The Abseil Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// https://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. -// -// ----------------------------------------------------------------------------- -// File: leak_check.h -// ----------------------------------------------------------------------------- -// -// This file contains functions that affect leak checking behavior within -// targets built with the LeakSanitizer (LSan), a memory leak detector that is -// integrated within the AddressSanitizer (ASan) as an additional component, or -// which can be used standalone. LSan and ASan are included (or can be provided) -// as additional components for most compilers such as Clang, gcc and MSVC. -// Note: this leak checking API is not yet supported in MSVC. -// Leak checking is enabled by default in all ASan builds. -// -// See https://github.com/google/sanitizers/wiki/AddressSanitizerLeakSanitizer -// -// ----------------------------------------------------------------------------- -#ifndef ABSL_DEBUGGING_LEAK_CHECK_H_ -#define ABSL_DEBUGGING_LEAK_CHECK_H_ - -#include <cstddef> - -#include "absl/base/config.h" - -namespace absl { -ABSL_NAMESPACE_BEGIN - -// HaveLeakSanitizer() -// -// Returns true if a leak-checking sanitizer (either ASan or standalone LSan) is -// currently built into this target. -bool HaveLeakSanitizer(); - -// DoIgnoreLeak() -// -// Implements `IgnoreLeak()` below. This function should usually -// not be called directly; calling `IgnoreLeak()` is preferred. -void DoIgnoreLeak(const void* ptr); - -// IgnoreLeak() -// -// Instruct the leak sanitizer to ignore leak warnings on the object referenced -// by the passed pointer, as well as all heap objects transitively referenced -// by it. The passed object pointer can point to either the beginning of the -// object or anywhere within it. -// -// Example: -// -// static T* obj = IgnoreLeak(new T(...)); -// -// If the passed `ptr` does not point to an actively allocated object at the -// time `IgnoreLeak()` is called, the call is a no-op; if it is actively -// allocated, the object must not get deallocated later. -// -template <typename T> -T* IgnoreLeak(T* ptr) { - DoIgnoreLeak(ptr); - return ptr; -} - -// LeakCheckDisabler -// -// This helper class indicates that any heap allocations done in the code block -// covered by the scoped object, which should be allocated on the stack, will -// not be reported as leaks. Leak check disabling will occur within the code -// block and any nested function calls within the code block. -// -// Example: -// -// void Foo() { -// LeakCheckDisabler disabler; -// ... code that allocates objects whose leaks should be ignored ... -// } -// -// REQUIRES: Destructor runs in same thread as constructor -class LeakCheckDisabler { - public: - LeakCheckDisabler(); - LeakCheckDisabler(const LeakCheckDisabler&) = delete; - LeakCheckDisabler& operator=(const LeakCheckDisabler&) = delete; - ~LeakCheckDisabler(); -}; - -// RegisterLivePointers() -// -// Registers `ptr[0,size-1]` as pointers to memory that is still actively being -// referenced and for which leak checking should be ignored. This function is -// useful if you store pointers in mapped memory, for memory ranges that we know -// are correct but for which normal analysis would flag as leaked code. -void RegisterLivePointers(const void* ptr, size_t size); - -// UnRegisterLivePointers() -// -// Deregisters the pointers previously marked as active in -// `RegisterLivePointers()`, enabling leak checking of those pointers. -void UnRegisterLivePointers(const void* ptr, size_t size); - -ABSL_NAMESPACE_END -} // namespace absl - -#endif // ABSL_DEBUGGING_LEAK_CHECK_H_ diff --git a/third_party/abseil_cpp/absl/debugging/leak_check_disable.cc b/third_party/abseil_cpp/absl/debugging/leak_check_disable.cc deleted file mode 100644 index 924d6e3d543b..000000000000 --- a/third_party/abseil_cpp/absl/debugging/leak_check_disable.cc +++ /dev/null @@ -1,20 +0,0 @@ -// Copyright 2017 The Abseil Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// https://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -// Disable LeakSanitizer when this file is linked in. -// This function overrides __lsan_is_turned_off from sanitizer/lsan_interface.h -extern "C" int __lsan_is_turned_off(); -extern "C" int __lsan_is_turned_off() { - return 1; -} diff --git a/third_party/abseil_cpp/absl/debugging/leak_check_fail_test.cc b/third_party/abseil_cpp/absl/debugging/leak_check_fail_test.cc deleted file mode 100644 index c49b81a9d9e2..000000000000 --- a/third_party/abseil_cpp/absl/debugging/leak_check_fail_test.cc +++ /dev/null @@ -1,41 +0,0 @@ -// Copyright 2017 The Abseil Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// https://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -#include <memory> -#include "gtest/gtest.h" -#include "absl/base/internal/raw_logging.h" -#include "absl/debugging/leak_check.h" - -namespace { - -TEST(LeakCheckTest, LeakMemory) { - // This test is expected to cause lsan failures on program exit. Therefore the - // test will be run only by leak_check_test.sh, which will verify a - // failed exit code. - - char* foo = strdup("lsan should complain about this leaked string"); - ABSL_RAW_LOG(INFO, "Should detect leaked string %s", foo); -} - -TEST(LeakCheckTest, LeakMemoryAfterDisablerScope) { - // This test is expected to cause lsan failures on program exit. Therefore the - // test will be run only by external_leak_check_test.sh, which will verify a - // failed exit code. - { absl::LeakCheckDisabler disabler; } - char* foo = strdup("lsan should also complain about this leaked string"); - ABSL_RAW_LOG(INFO, "Re-enabled leak detection.Should detect leaked string %s", - foo); -} - -} // namespace diff --git a/third_party/abseil_cpp/absl/debugging/leak_check_test.cc b/third_party/abseil_cpp/absl/debugging/leak_check_test.cc deleted file mode 100644 index b5cc4874880f..000000000000 --- a/third_party/abseil_cpp/absl/debugging/leak_check_test.cc +++ /dev/null @@ -1,42 +0,0 @@ -// Copyright 2017 The Abseil Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// https://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -#include <string> - -#include "gtest/gtest.h" -#include "absl/base/internal/raw_logging.h" -#include "absl/debugging/leak_check.h" - -namespace { - -TEST(LeakCheckTest, DetectLeakSanitizer) { -#ifdef ABSL_EXPECT_LEAK_SANITIZER - EXPECT_TRUE(absl::HaveLeakSanitizer()); -#else - EXPECT_FALSE(absl::HaveLeakSanitizer()); -#endif -} - -TEST(LeakCheckTest, IgnoreLeakSuppressesLeakedMemoryErrors) { - auto foo = absl::IgnoreLeak(new std::string("some ignored leaked string")); - ABSL_RAW_LOG(INFO, "Ignoring leaked string %s", foo->c_str()); -} - -TEST(LeakCheckTest, LeakCheckDisablerIgnoresLeak) { - absl::LeakCheckDisabler disabler; - auto foo = new std::string("some string leaked while checks are disabled"); - ABSL_RAW_LOG(INFO, "Ignoring leaked string %s", foo->c_str()); -} - -} // namespace diff --git a/third_party/abseil_cpp/absl/debugging/stacktrace.cc b/third_party/abseil_cpp/absl/debugging/stacktrace.cc deleted file mode 100644 index 1f7c7d82b2d2..000000000000 --- a/third_party/abseil_cpp/absl/debugging/stacktrace.cc +++ /dev/null @@ -1,140 +0,0 @@ -// Copyright 2017 The Abseil Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// https://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -// Produce stack trace. -// -// There are three different ways we can try to get the stack trace: -// -// 1) 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. -// -// 2) 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. -// -// 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(). -// -// Note: if you add a new implementation here, make sure it works -// correctly when absl::GetStackTrace() is called with max_depth == 0. -// Some code may do that. - -#include "absl/debugging/stacktrace.h" - -#include <atomic> - -#include "absl/base/attributes.h" -#include "absl/base/port.h" -#include "absl/debugging/internal/stacktrace_config.h" - -#if defined(ABSL_STACKTRACE_INL_HEADER) -#include ABSL_STACKTRACE_INL_HEADER -#else -# error Cannot calculate stack trace: will need to write for your environment - -# include "absl/debugging/internal/stacktrace_aarch64-inl.inc" -# include "absl/debugging/internal/stacktrace_arm-inl.inc" -# include "absl/debugging/internal/stacktrace_generic-inl.inc" -# include "absl/debugging/internal/stacktrace_powerpc-inl.inc" -# include "absl/debugging/internal/stacktrace_unimplemented-inl.inc" -# include "absl/debugging/internal/stacktrace_win32-inl.inc" -# include "absl/debugging/internal/stacktrace_x86-inl.inc" -#endif - -namespace absl { -ABSL_NAMESPACE_BEGIN -namespace { - -typedef int (*Unwinder)(void**, int*, int, int, const void*, int*); -std::atomic<Unwinder> custom; - -template <bool IS_STACK_FRAMES, bool IS_WITH_CONTEXT> -ABSL_ATTRIBUTE_ALWAYS_INLINE inline int Unwind(void** result, int* sizes, - int max_depth, int skip_count, - const void* uc, - int* min_dropped_frames) { - Unwinder f = &UnwindImpl<IS_STACK_FRAMES, IS_WITH_CONTEXT>; - Unwinder g = custom.load(std::memory_order_acquire); - if (g != nullptr) f = g; - - // Add 1 to skip count for the unwinder function itself - int size = (*f)(result, sizes, max_depth, skip_count + 1, uc, - min_dropped_frames); - // To disable tail call to (*f)(...) - ABSL_BLOCK_TAIL_CALL_OPTIMIZATION(); - return size; -} - -} // anonymous namespace - -ABSL_ATTRIBUTE_NOINLINE ABSL_ATTRIBUTE_NO_TAIL_CALL int GetStackFrames( - void** result, int* sizes, int max_depth, int skip_count) { - return Unwind<true, false>(result, sizes, max_depth, skip_count, nullptr, - nullptr); -} - -ABSL_ATTRIBUTE_NOINLINE ABSL_ATTRIBUTE_NO_TAIL_CALL int -GetStackFramesWithContext(void** result, int* sizes, int max_depth, - int skip_count, const void* uc, - int* min_dropped_frames) { - return Unwind<true, true>(result, sizes, max_depth, skip_count, uc, - min_dropped_frames); -} - -ABSL_ATTRIBUTE_NOINLINE ABSL_ATTRIBUTE_NO_TAIL_CALL int GetStackTrace( - void** result, int max_depth, int skip_count) { - return Unwind<false, false>(result, nullptr, max_depth, skip_count, nullptr, - nullptr); -} - -ABSL_ATTRIBUTE_NOINLINE ABSL_ATTRIBUTE_NO_TAIL_CALL int -GetStackTraceWithContext(void** result, int max_depth, int skip_count, - const void* uc, int* min_dropped_frames) { - return Unwind<false, true>(result, nullptr, max_depth, skip_count, uc, - min_dropped_frames); -} - -void SetStackUnwinder(Unwinder w) { - custom.store(w, std::memory_order_release); -} - -int DefaultStackUnwinder(void** pcs, int* sizes, int depth, int skip, - const void* uc, int* min_dropped_frames) { - skip++; // For this function - Unwinder f = nullptr; - if (sizes == nullptr) { - if (uc == nullptr) { - f = &UnwindImpl<false, false>; - } else { - f = &UnwindImpl<false, true>; - } - } else { - if (uc == nullptr) { - f = &UnwindImpl<true, false>; - } else { - f = &UnwindImpl<true, true>; - } - } - volatile int x = 0; - int n = (*f)(pcs, sizes, depth, skip, uc, min_dropped_frames); - x = 1; (void) x; // To disable tail call to (*f)(...) - return n; -} - -ABSL_NAMESPACE_END -} // namespace absl diff --git a/third_party/abseil_cpp/absl/debugging/stacktrace.h b/third_party/abseil_cpp/absl/debugging/stacktrace.h deleted file mode 100644 index 0ec0ffdabd42..000000000000 --- a/third_party/abseil_cpp/absl/debugging/stacktrace.h +++ /dev/null @@ -1,231 +0,0 @@ -// Copyright 2018 The Abseil Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// https://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. -// -// ----------------------------------------------------------------------------- -// File: stacktrace.h -// ----------------------------------------------------------------------------- -// -// This file contains routines to extract the current stack trace and associated -// stack frames. These functions are thread-safe and async-signal-safe. -// -// Note that stack trace functionality is platform dependent and requires -// additional support from the compiler/build system in most cases. (That is, -// this functionality generally only works on platforms/builds that have been -// specifically configured to support it.) -// -// Note: stack traces in Abseil that do not utilize a symbolizer will result in -// frames consisting of function addresses rather than human-readable function -// names. (See symbolize.h for information on symbolizing these values.) - -#ifndef ABSL_DEBUGGING_STACKTRACE_H_ -#define ABSL_DEBUGGING_STACKTRACE_H_ - -#include "absl/base/config.h" - -namespace absl { -ABSL_NAMESPACE_BEGIN - -// GetStackFrames() -// -// Records program counter values for up to `max_depth` frames, skipping the -// most recent `skip_count` stack frames, stores their corresponding values -// and sizes in `results` and `sizes` buffers, and returns the number of frames -// stored. (Note that the frame generated for the `absl::GetStackFrames()` -// routine itself is also skipped.) -// -// Example: -// -// main() { foo(); } -// foo() { bar(); } -// bar() { -// void* result[10]; -// int sizes[10]; -// int depth = absl::GetStackFrames(result, sizes, 10, 1); -// } -// -// The current stack frame would consist of three function calls: `bar()`, -// `foo()`, and then `main()`; however, since the `GetStackFrames()` call sets -// `skip_count` to `1`, it will skip the frame for `bar()`, the most recently -// invoked function call. It will therefore return 2 and fill `result` with -// program counters within the following functions: -// -// result[0] foo() -// result[1] main() -// -// (Note: in practice, a few more entries after `main()` may be added to account -// for startup processes.) -// -// Corresponding stack frame sizes will also be recorded: -// -// sizes[0] 16 -// sizes[1] 16 -// -// (Stack frame sizes of `16` above are just for illustration purposes.) -// -// Stack frame sizes of 0 or less indicate that those frame sizes couldn't -// be identified. -// -// This routine may return fewer stack frame entries than are -// available. Also note that `result` and `sizes` must both be non-null. -extern int GetStackFrames(void** result, int* sizes, int max_depth, - int skip_count); - -// GetStackFramesWithContext() -// -// Records program counter values obtained from a signal handler. Records -// program counter values for up to `max_depth` frames, skipping the most recent -// `skip_count` stack frames, stores their corresponding values and sizes in -// `results` and `sizes` buffers, and returns the number of frames stored. (Note -// that the frame generated for the `absl::GetStackFramesWithContext()` routine -// itself is also skipped.) -// -// The `uc` parameter, if non-null, should be a pointer to a `ucontext_t` value -// passed to a signal handler registered via the `sa_sigaction` field of a -// `sigaction` struct. (See -// http://man7.org/linux/man-pages/man2/sigaction.2.html.) The `uc` value may -// help a stack unwinder to provide a better stack trace under certain -// conditions. `uc` may safely be null. -// -// The `min_dropped_frames` output parameter, if non-null, points to the -// location to note any dropped stack frames, if any, due to buffer limitations -// or other reasons. (This value will be set to `0` if no frames were dropped.) -// The number of total stack frames is guaranteed to be >= skip_count + -// max_depth + *min_dropped_frames. -extern int GetStackFramesWithContext(void** result, int* sizes, int max_depth, - int skip_count, const void* uc, - int* min_dropped_frames); - -// GetStackTrace() -// -// Records program counter values for up to `max_depth` frames, skipping the -// most recent `skip_count` stack frames, stores their corresponding values -// in `results`, and returns the number of frames -// stored. Note that this function is similar to `absl::GetStackFrames()` -// except that it returns the stack trace only, and not stack frame sizes. -// -// Example: -// -// main() { foo(); } -// foo() { bar(); } -// bar() { -// void* result[10]; -// int depth = absl::GetStackTrace(result, 10, 1); -// } -// -// This produces: -// -// result[0] foo -// result[1] main -// .... ... -// -// `result` must not be null. -extern int GetStackTrace(void** result, int max_depth, int skip_count); - -// GetStackTraceWithContext() -// -// Records program counter values obtained from a signal handler. Records -// program counter values for up to `max_depth` frames, skipping the most recent -// `skip_count` stack frames, stores their corresponding values in `results`, -// and returns the number of frames stored. (Note that the frame generated for -// the `absl::GetStackFramesWithContext()` routine itself is also skipped.) -// -// The `uc` parameter, if non-null, should be a pointer to a `ucontext_t` value -// passed to a signal handler registered via the `sa_sigaction` field of a -// `sigaction` struct. (See -// http://man7.org/linux/man-pages/man2/sigaction.2.html.) The `uc` value may -// help a stack unwinder to provide a better stack trace under certain -// conditions. `uc` may safely be null. -// -// The `min_dropped_frames` output parameter, if non-null, points to the -// location to note any dropped stack frames, if any, due to buffer limitations -// or other reasons. (This value will be set to `0` if no frames were dropped.) -// The number of total stack frames is guaranteed to be >= skip_count + -// max_depth + *min_dropped_frames. -extern int GetStackTraceWithContext(void** result, int max_depth, - int skip_count, const void* uc, - int* min_dropped_frames); - -// SetStackUnwinder() -// -// Provides a custom function for unwinding stack frames that will be used in -// place of the default stack unwinder when invoking the static -// GetStack{Frames,Trace}{,WithContext}() functions above. -// -// The arguments passed to the unwinder function will match the -// arguments passed to `absl::GetStackFramesWithContext()` except that sizes -// will be non-null iff the caller is interested in frame sizes. -// -// If unwinder is set to null, we revert to the default stack-tracing behavior. -// -// ***************************************************************************** -// WARNING -// ***************************************************************************** -// -// absl::SetStackUnwinder is not suitable for general purpose use. It is -// provided for custom runtimes. -// Some things to watch out for when calling `absl::SetStackUnwinder()`: -// -// (a) The unwinder may be called from within signal handlers and -// therefore must be async-signal-safe. -// -// (b) Even after a custom stack unwinder has been unregistered, other -// threads may still be in the process of using that unwinder. -// Therefore do not clean up any state that may be needed by an old -// unwinder. -// ***************************************************************************** -extern void SetStackUnwinder(int (*unwinder)(void** pcs, int* sizes, - int max_depth, int skip_count, - const void* uc, - int* min_dropped_frames)); - -// DefaultStackUnwinder() -// -// Records program counter values of up to `max_depth` frames, skipping the most -// recent `skip_count` stack frames, and stores their corresponding values in -// `pcs`. (Note that the frame generated for this call itself is also skipped.) -// This function acts as a generic stack-unwinder; prefer usage of the more -// specific `GetStack{Trace,Frames}{,WithContext}()` functions above. -// -// If you have set your own stack unwinder (with the `SetStackUnwinder()` -// function above, you can still get the default stack unwinder by calling -// `DefaultStackUnwinder()`, which will ignore any previously set stack unwinder -// and use the default one instead. -// -// Because this function is generic, only `pcs` is guaranteed to be non-null -// upon return. It is legal for `sizes`, `uc`, and `min_dropped_frames` to all -// be null when called. -// -// The semantics are the same as the corresponding `GetStack*()` function in the -// case where `absl::SetStackUnwinder()` was never called. Equivalents are: -// -// null sizes | non-nullptr sizes -// |==========================================================| -// null uc | GetStackTrace() | GetStackFrames() | -// non-null uc | GetStackTraceWithContext() | GetStackFramesWithContext() | -// |==========================================================| -extern int DefaultStackUnwinder(void** pcs, int* sizes, int max_depth, - int skip_count, const void* uc, - int* min_dropped_frames); - -namespace debugging_internal { -// Returns true for platforms which are expected to have functioning stack trace -// implementations. Intended to be used for tests which want to exclude -// verification of logic known to be broken because stack traces are not -// working. -extern bool StackTraceWorksForTest(); -} // namespace debugging_internal -ABSL_NAMESPACE_END -} // namespace absl - -#endif // ABSL_DEBUGGING_STACKTRACE_H_ diff --git a/third_party/abseil_cpp/absl/debugging/symbolize.cc b/third_party/abseil_cpp/absl/debugging/symbolize.cc deleted file mode 100644 index 5e4a25d69dce..000000000000 --- a/third_party/abseil_cpp/absl/debugging/symbolize.cc +++ /dev/null @@ -1,36 +0,0 @@ -// Copyright 2018 The Abseil Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// https://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -#include "absl/debugging/symbolize.h" - -#ifdef _WIN32 -#include <winapifamily.h> -#if !(WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_APP)) || \ - WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP) -// UWP doesn't have access to win32 APIs. -#define ABSL_INTERNAL_HAVE_SYMBOLIZE_WIN32 -#endif -#endif - -#if defined(ABSL_INTERNAL_HAVE_ELF_SYMBOLIZE) -#include "absl/debugging/symbolize_elf.inc" -#elif defined(ABSL_INTERNAL_HAVE_SYMBOLIZE_WIN32) -// The Windows Symbolizer only works if PDB files containing the debug info -// are available to the program at runtime. -#include "absl/debugging/symbolize_win32.inc" -#elif defined(__APPLE__) -#include "absl/debugging/symbolize_darwin.inc" -#else -#include "absl/debugging/symbolize_unimplemented.inc" -#endif diff --git a/third_party/abseil_cpp/absl/debugging/symbolize.h b/third_party/abseil_cpp/absl/debugging/symbolize.h deleted file mode 100644 index 43d93a86822e..000000000000 --- a/third_party/abseil_cpp/absl/debugging/symbolize.h +++ /dev/null @@ -1,99 +0,0 @@ -// Copyright 2018 The Abseil Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// https://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. -// -// ----------------------------------------------------------------------------- -// File: symbolize.h -// ----------------------------------------------------------------------------- -// -// This file configures the Abseil symbolizer for use in converting instruction -// pointer addresses (program counters) into human-readable names (function -// calls, etc.) within Abseil code. -// -// The symbolizer may be invoked from several sources: -// -// * Implicitly, through the installation of an Abseil failure signal handler. -// (See failure_signal_handler.h for more information.) -// * By calling `Symbolize()` directly on a program counter you obtain through -// `absl::GetStackTrace()` or `absl::GetStackFrames()`. (See stacktrace.h -// for more information. -// * By calling `Symbolize()` directly on a program counter you obtain through -// other means (which would be platform-dependent). -// -// In all of the above cases, the symbolizer must first be initialized before -// any program counter values can be symbolized. If you are installing a failure -// signal handler, initialize the symbolizer before you do so. -// -// Example: -// -// int main(int argc, char** argv) { -// // Initialize the Symbolizer before installing the failure signal handler -// absl::InitializeSymbolizer(argv[0]); -// -// // Now you may install the failure signal handler -// absl::FailureSignalHandlerOptions options; -// absl::InstallFailureSignalHandler(options); -// -// // Start running your main program -// ... -// return 0; -// } -// -#ifndef ABSL_DEBUGGING_SYMBOLIZE_H_ -#define ABSL_DEBUGGING_SYMBOLIZE_H_ - -#include "absl/debugging/internal/symbolize.h" - -namespace absl { -ABSL_NAMESPACE_BEGIN - -// InitializeSymbolizer() -// -// Initializes the program counter symbolizer, given the path of the program -// (typically obtained through `main()`s `argv[0]`). The Abseil symbolizer -// allows you to read program counters (instruction pointer values) using their -// human-readable names within output such as stack traces. -// -// Example: -// -// int main(int argc, char *argv[]) { -// absl::InitializeSymbolizer(argv[0]); -// // Now you can use the symbolizer -// } -void InitializeSymbolizer(const char* argv0); -// -// Symbolize() -// -// Symbolizes a program counter (instruction pointer value) `pc` and, on -// success, writes the name to `out`. The symbol name is demangled, if possible. -// Note that the symbolized name may be truncated and will be NUL-terminated. -// Demangling is supported for symbols generated by GCC 3.x or newer). Returns -// `false` on failure. -// -// Example: -// -// // Print a program counter and its symbol name. -// static void DumpPCAndSymbol(void *pc) { -// char tmp[1024]; -// const char *symbol = "(unknown)"; -// if (absl::Symbolize(pc, tmp, sizeof(tmp))) { -// symbol = tmp; -// } -// absl::PrintF("%p %s\n", pc, symbol); -// } -bool Symbolize(const void *pc, char *out, int out_size); - -ABSL_NAMESPACE_END -} // namespace absl - -#endif // ABSL_DEBUGGING_SYMBOLIZE_H_ diff --git a/third_party/abseil_cpp/absl/debugging/symbolize_darwin.inc b/third_party/abseil_cpp/absl/debugging/symbolize_darwin.inc deleted file mode 100644 index 443ce9efc4ce..000000000000 --- a/third_party/abseil_cpp/absl/debugging/symbolize_darwin.inc +++ /dev/null @@ -1,101 +0,0 @@ -// Copyright 2020 The Abseil Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// https://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -#include <cxxabi.h> -#include <execinfo.h> - -#include <algorithm> -#include <cstring> - -#include "absl/base/internal/raw_logging.h" -#include "absl/debugging/internal/demangle.h" -#include "absl/strings/numbers.h" -#include "absl/strings/str_cat.h" -#include "absl/strings/string_view.h" - -namespace absl { -ABSL_NAMESPACE_BEGIN - -void InitializeSymbolizer(const char*) {} - -namespace debugging_internal { -namespace { - -static std::string GetSymbolString(absl::string_view backtrace_line) { - // Example Backtrace lines: - // 0 libimaging_shared.dylib 0x018c152a - // _ZNSt11_Deque_baseIN3nik7mediadb4PageESaIS2_EE17_M_initialize_mapEm + 3478 - // - // or - // 0 libimaging_shared.dylib 0x0000000001895c39 - // _ZN3nik4util19register_shared_ptrINS_3gpu7TextureEEEvPKvS5_ + 39 - // - // or - // 0 mysterious_app 0x0124000120120009 main + 17 - auto address_pos = backtrace_line.find(" 0x"); - if (address_pos == absl::string_view::npos) return std::string(); - absl::string_view symbol_view = backtrace_line.substr(address_pos + 1); - - auto space_pos = symbol_view.find(" "); - if (space_pos == absl::string_view::npos) return std::string(); - symbol_view = symbol_view.substr(space_pos + 1); // to mangled symbol - - auto plus_pos = symbol_view.find(" + "); - if (plus_pos == absl::string_view::npos) return std::string(); - symbol_view = symbol_view.substr(0, plus_pos); // strip remainng - - return std::string(symbol_view); -} - -} // namespace -} // namespace debugging_internal - -bool Symbolize(const void* pc, char* out, int out_size) { - if (out_size <= 0 || pc == nullptr) { - out = nullptr; - return false; - } - - // This allocates a char* array. - char** frame_strings = backtrace_symbols(const_cast<void**>(&pc), 1); - - if (frame_strings == nullptr) return false; - - std::string symbol = debugging_internal::GetSymbolString(frame_strings[0]); - free(frame_strings); - - char tmp_buf[1024]; - if (debugging_internal::Demangle(symbol.c_str(), tmp_buf, sizeof(tmp_buf))) { - size_t len = strlen(tmp_buf); - if (len + 1 <= static_cast<size_t>(out_size)) { // +1 for '\0' - assert(len < sizeof(tmp_buf)); - memmove(out, tmp_buf, len + 1); - } - } else { - strncpy(out, symbol.c_str(), out_size); - } - - if (out[out_size - 1] != '\0') { - // strncpy() does not '\0' terminate when it truncates. - static constexpr char kEllipsis[] = "..."; - int ellipsis_size = std::min<int>(sizeof(kEllipsis) - 1, out_size - 1); - memcpy(out + out_size - ellipsis_size - 1, kEllipsis, ellipsis_size); - out[out_size - 1] = '\0'; - } - - return true; -} - -ABSL_NAMESPACE_END -} // namespace absl diff --git a/third_party/abseil_cpp/absl/debugging/symbolize_elf.inc b/third_party/abseil_cpp/absl/debugging/symbolize_elf.inc deleted file mode 100644 index f4d5727bdeb5..000000000000 --- a/third_party/abseil_cpp/absl/debugging/symbolize_elf.inc +++ /dev/null @@ -1,1560 +0,0 @@ -// Copyright 2018 The Abseil Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// https://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -// 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 -// signal handlers, hence it doesn't use malloc() and other unsafe -// operations. It should be both thread-safe and async-signal-safe. -// -// 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. - -#include <dlfcn.h> -#include <elf.h> -#include <fcntl.h> -#include <link.h> // For ElfW() macro. -#include <sys/stat.h> -#include <sys/types.h> -#include <unistd.h> - -#include <algorithm> -#include <array> -#include <atomic> -#include <cerrno> -#include <cinttypes> -#include <climits> -#include <cstdint> -#include <cstdio> -#include <cstdlib> -#include <cstring> - -#include "absl/base/casts.h" -#include "absl/base/dynamic_annotations.h" -#include "absl/base/internal/low_level_alloc.h" -#include "absl/base/internal/raw_logging.h" -#include "absl/base/internal/spinlock.h" -#include "absl/base/port.h" -#include "absl/debugging/internal/demangle.h" -#include "absl/debugging/internal/vdso_support.h" -#include "absl/strings/string_view.h" - -namespace absl { -ABSL_NAMESPACE_BEGIN - -// Value of argv[0]. Used by MaybeInitializeObjFile(). -static char *argv0_value = nullptr; - -void InitializeSymbolizer(const char *argv0) { -#ifdef ABSL_HAVE_VDSO_SUPPORT - // We need to make sure VDSOSupport::Init() is called before any setuid or - // chroot calls, so InitializeSymbolizer() should be called very early in the - // life of a program. - absl::debugging_internal::VDSOSupport::Init(); -#endif - if (argv0_value != nullptr) { - free(argv0_value); - argv0_value = nullptr; - } - if (argv0 != nullptr && argv0[0] != '\0') { - argv0_value = strdup(argv0); - } -} - -namespace debugging_internal { -namespace { - -// Re-runs fn until it doesn't cause EINTR. -#define NO_INTR(fn) \ - do { \ - } while ((fn) < 0 && errno == EINTR) - -// On Linux, ELF_ST_* are defined in <linux/elf.h>. To make this portable -// we define our own ELF_ST_BIND and ELF_ST_TYPE if not available. -#ifndef ELF_ST_BIND -#define ELF_ST_BIND(info) (((unsigned char)(info)) >> 4) -#endif - -#ifndef ELF_ST_TYPE -#define ELF_ST_TYPE(info) (((unsigned char)(info)) & 0xF) -#endif - -// Some platforms use a special .opd section to store function pointers. -const char kOpdSectionName[] = ".opd"; - -#if (defined(__powerpc__) && !(_CALL_ELF > 1)) || defined(__ia64) -// Use opd section for function descriptors on these platforms, the function -// address is the first word of the descriptor. -enum { kPlatformUsesOPDSections = 1 }; -#else // not PPC or IA64 -enum { kPlatformUsesOPDSections = 0 }; -#endif - -// This works for PowerPC & IA64 only. A function descriptor consist of two -// pointers and the first one is the function's entry. -const size_t kFunctionDescriptorSize = sizeof(void *) * 2; - -const int kMaxDecorators = 10; // Seems like a reasonable upper limit. - -struct InstalledSymbolDecorator { - SymbolDecorator fn; - void *arg; - int ticket; -}; - -int g_num_decorators; -InstalledSymbolDecorator g_decorators[kMaxDecorators]; - -struct FileMappingHint { - const void *start; - const void *end; - uint64_t offset; - const char *filename; -}; - -// Protects g_decorators. -// We are using SpinLock and not a Mutex here, because we may be called -// from inside Mutex::Lock itself, and it prohibits recursive calls. -// This happens in e.g. base/stacktrace_syscall_unittest. -// Moreover, we are using only TryLock(), if the decorator list -// is being modified (is busy), we skip all decorators, and possibly -// loose some info. Sorry, that's the best we could do. -ABSL_CONST_INIT absl::base_internal::SpinLock g_decorators_mu( - absl::kConstInit, absl::base_internal::SCHEDULE_KERNEL_ONLY); - -const int kMaxFileMappingHints = 8; -int g_num_file_mapping_hints; -FileMappingHint g_file_mapping_hints[kMaxFileMappingHints]; -// Protects g_file_mapping_hints. -ABSL_CONST_INIT absl::base_internal::SpinLock g_file_mapping_mu( - absl::kConstInit, absl::base_internal::SCHEDULE_KERNEL_ONLY); - -// Async-signal-safe function to zero a buffer. -// memset() is not guaranteed to be async-signal-safe. -static void SafeMemZero(void* p, size_t size) { - unsigned char *c = static_cast<unsigned char *>(p); - while (size--) { - *c++ = 0; - } -} - -struct ObjFile { - ObjFile() - : filename(nullptr), - start_addr(nullptr), - end_addr(nullptr), - offset(0), - fd(-1), - elf_type(-1) { - SafeMemZero(&elf_header, sizeof(elf_header)); - SafeMemZero(&phdr[0], sizeof(phdr)); - } - - char *filename; - const void *start_addr; - const void *end_addr; - uint64_t offset; - - // The following fields are initialized on the first access to the - // object file. - int fd; - int elf_type; - ElfW(Ehdr) elf_header; - - // PT_LOAD program header describing executable code. - // Normally we expect just one, but SWIFT binaries have two. - std::array<ElfW(Phdr), 2> phdr; -}; - -// Build 4-way associative cache for symbols. Within each cache line, symbols -// are replaced in LRU order. -enum { - ASSOCIATIVITY = 4, -}; -struct SymbolCacheLine { - const void *pc[ASSOCIATIVITY]; - char *name[ASSOCIATIVITY]; - - // age[i] is incremented when a line is accessed. it's reset to zero if the - // i'th entry is read. - uint32_t age[ASSOCIATIVITY]; -}; - -// --------------------------------------------------------------- -// An async-signal-safe arena for LowLevelAlloc -static std::atomic<base_internal::LowLevelAlloc::Arena *> g_sig_safe_arena; - -static base_internal::LowLevelAlloc::Arena *SigSafeArena() { - return g_sig_safe_arena.load(std::memory_order_acquire); -} - -static void InitSigSafeArena() { - if (SigSafeArena() == nullptr) { - base_internal::LowLevelAlloc::Arena *new_arena = - base_internal::LowLevelAlloc::NewArena( - base_internal::LowLevelAlloc::kAsyncSignalSafe); - base_internal::LowLevelAlloc::Arena *old_value = nullptr; - if (!g_sig_safe_arena.compare_exchange_strong(old_value, new_arena, - std::memory_order_release, - std::memory_order_relaxed)) { - // We lost a race to allocate an arena; deallocate. - base_internal::LowLevelAlloc::DeleteArena(new_arena); - } - } -} - -// --------------------------------------------------------------- -// An AddrMap is a vector of ObjFile, using SigSafeArena() for allocation. - -class AddrMap { - public: - AddrMap() : size_(0), allocated_(0), obj_(nullptr) {} - ~AddrMap() { base_internal::LowLevelAlloc::Free(obj_); } - int Size() const { return size_; } - ObjFile *At(int i) { return &obj_[i]; } - ObjFile *Add(); - void Clear(); - - private: - int size_; // count of valid elements (<= allocated_) - int allocated_; // count of allocated elements - ObjFile *obj_; // array of allocated_ elements - AddrMap(const AddrMap &) = delete; - AddrMap &operator=(const AddrMap &) = delete; -}; - -void AddrMap::Clear() { - for (int i = 0; i != size_; i++) { - At(i)->~ObjFile(); - } - size_ = 0; -} - -ObjFile *AddrMap::Add() { - if (size_ == allocated_) { - int new_allocated = allocated_ * 2 + 50; - ObjFile *new_obj_ = - static_cast<ObjFile *>(base_internal::LowLevelAlloc::AllocWithArena( - new_allocated * sizeof(*new_obj_), SigSafeArena())); - if (obj_) { - memcpy(new_obj_, obj_, allocated_ * sizeof(*new_obj_)); - base_internal::LowLevelAlloc::Free(obj_); - } - obj_ = new_obj_; - allocated_ = new_allocated; - } - return new (&obj_[size_++]) ObjFile; -} - -// --------------------------------------------------------------- - -enum FindSymbolResult { SYMBOL_NOT_FOUND = 1, SYMBOL_TRUNCATED, SYMBOL_FOUND }; - -class Symbolizer { - public: - Symbolizer(); - ~Symbolizer(); - const char *GetSymbol(const void *const pc); - - private: - char *CopyString(const char *s) { - int len = strlen(s); - char *dst = static_cast<char *>( - base_internal::LowLevelAlloc::AllocWithArena(len + 1, SigSafeArena())); - ABSL_RAW_CHECK(dst != nullptr, "out of memory"); - memcpy(dst, s, len + 1); - return dst; - } - ObjFile *FindObjFile(const void *const start, - size_t size) ABSL_ATTRIBUTE_NOINLINE; - static bool RegisterObjFile(const char *filename, - const void *const start_addr, - const void *const end_addr, uint64_t offset, - void *arg); - SymbolCacheLine *GetCacheLine(const void *const pc); - const char *FindSymbolInCache(const void *const pc); - const char *InsertSymbolInCache(const void *const pc, const char *name); - void AgeSymbols(SymbolCacheLine *line); - void ClearAddrMap(); - FindSymbolResult GetSymbolFromObjectFile(const ObjFile &obj, - const void *const pc, - const ptrdiff_t relocation, - char *out, int out_size, - char *tmp_buf, int tmp_buf_size); - - enum { - SYMBOL_BUF_SIZE = 3072, - TMP_BUF_SIZE = 1024, - SYMBOL_CACHE_LINES = 128, - }; - - AddrMap addr_map_; - - bool ok_; - bool addr_map_read_; - - char symbol_buf_[SYMBOL_BUF_SIZE]; - - // tmp_buf_ will be used to store arrays of ElfW(Shdr) and ElfW(Sym) - // so we ensure that tmp_buf_ is properly aligned to store either. - alignas(16) char tmp_buf_[TMP_BUF_SIZE]; - static_assert(alignof(ElfW(Shdr)) <= 16, - "alignment of tmp buf too small for Shdr"); - static_assert(alignof(ElfW(Sym)) <= 16, - "alignment of tmp buf too small for Sym"); - - SymbolCacheLine symbol_cache_[SYMBOL_CACHE_LINES]; -}; - -static std::atomic<Symbolizer *> g_cached_symbolizer; - -} // namespace - -static int SymbolizerSize() { -#if defined(__wasm__) || defined(__asmjs__) - int pagesize = getpagesize(); -#else - int pagesize = sysconf(_SC_PAGESIZE); -#endif - return ((sizeof(Symbolizer) - 1) / pagesize + 1) * pagesize; -} - -// Return (and set null) g_cached_symbolized_state if it is not null. -// Otherwise return a new symbolizer. -static Symbolizer *AllocateSymbolizer() { - InitSigSafeArena(); - Symbolizer *symbolizer = - g_cached_symbolizer.exchange(nullptr, std::memory_order_acquire); - if (symbolizer != nullptr) { - return symbolizer; - } - return new (base_internal::LowLevelAlloc::AllocWithArena( - SymbolizerSize(), SigSafeArena())) Symbolizer(); -} - -// Set g_cached_symbolize_state to s if it is null, otherwise -// delete s. -static void FreeSymbolizer(Symbolizer *s) { - Symbolizer *old_cached_symbolizer = nullptr; - if (!g_cached_symbolizer.compare_exchange_strong(old_cached_symbolizer, s, - std::memory_order_release, - std::memory_order_relaxed)) { - s->~Symbolizer(); - base_internal::LowLevelAlloc::Free(s); - } -} - -Symbolizer::Symbolizer() : ok_(true), addr_map_read_(false) { - for (SymbolCacheLine &symbol_cache_line : symbol_cache_) { - for (size_t j = 0; j < ABSL_ARRAYSIZE(symbol_cache_line.name); ++j) { - symbol_cache_line.pc[j] = nullptr; - symbol_cache_line.name[j] = nullptr; - symbol_cache_line.age[j] = 0; - } - } -} - -Symbolizer::~Symbolizer() { - for (SymbolCacheLine &symbol_cache_line : symbol_cache_) { - for (char *s : symbol_cache_line.name) { - base_internal::LowLevelAlloc::Free(s); - } - } - ClearAddrMap(); -} - -// 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. -#define SAFE_ASSERT(expr) ((expr) ? static_cast<void>(0) : abort()) - -// Read up to "count" bytes from 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 ReadPersistent(int fd, void *buf, size_t count) { - SAFE_ASSERT(fd >= 0); - SAFE_ASSERT(count <= SSIZE_MAX); - char *buf0 = reinterpret_cast<char *>(buf); - size_t num_bytes = 0; - while (num_bytes < count) { - ssize_t len; - NO_INTR(len = read(fd, buf0 + num_bytes, count - num_bytes)); - if (len < 0) { // There was an error other than EINTR. - ABSL_RAW_LOG(WARNING, "read failed: errno=%d", errno); - return -1; - } - if (len == 0) { // Reached EOF. - break; - } - num_bytes += len; - } - SAFE_ASSERT(num_bytes <= count); - return static_cast<ssize_t>(num_bytes); -} - -// Read up to "count" bytes from "offset" in the file pointed by file -// descriptor "fd" into the buffer starting at "buf". 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) { - off_t off = lseek(fd, offset, SEEK_SET); - if (off == (off_t)-1) { - ABSL_RAW_LOG(WARNING, "lseek(%d, %ju, SEEK_SET) failed: errno=%d", fd, - static_cast<uintmax_t>(offset), errno); - return -1; - } - return ReadPersistent(fd, buf, count); -} - -// 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 >= 0 && static_cast<size_t>(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 ABSL_ATTRIBUTE_NOINLINE bool GetSectionHeaderByType( - const int fd, ElfW(Half) sh_num, const off_t sh_offset, ElfW(Word) type, - ElfW(Shdr) * out, char *tmp_buf, int tmp_buf_size) { - ElfW(Shdr) *buf = reinterpret_cast<ElfW(Shdr) *>(tmp_buf); - const int buf_entries = tmp_buf_size / sizeof(buf[0]); - const int buf_bytes = buf_entries * sizeof(buf[0]); - - 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 = - (buf_bytes > num_bytes_left) ? num_bytes_left : buf_bytes; - const off_t offset = sh_offset + i * sizeof(buf[0]); - const ssize_t len = ReadFromOffset(fd, buf, num_bytes_to_read, offset); - if (len % sizeof(buf[0]) != 0) { - ABSL_RAW_LOG( - WARNING, - "Reading %zd bytes from offset %ju returned %zd which is not a " - "multiple of %zu.", - num_bytes_to_read, static_cast<uintmax_t>(offset), len, - sizeof(buf[0])); - return false; - } - const ssize_t num_headers_in_buf = len / sizeof(buf[0]); - SAFE_ASSERT(num_headers_in_buf <= buf_entries); - 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; - -bool ForEachSection(int fd, - const std::function<bool(absl::string_view name, - const ElfW(Shdr) &)> &callback) { - 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) { - ElfW(Shdr) out; - 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; - } - off_t name_offset = shstrtab.sh_offset + out.sh_name; - char header_name[kMaxSectionNameLen]; - ssize_t n_read = - ReadFromOffset(fd, &header_name, kMaxSectionNameLen, name_offset); - if (n_read == -1) { - return false; - } else if (n_read > kMaxSectionNameLen) { - // Long read? - return false; - } - - absl::string_view name(header_name, strnlen(header_name, n_read)); - if (!callback(name, out)) { - break; - } - } - return true; -} - -// name_len should include terminating '\0'. -bool GetSectionHeaderByName(int fd, const char *name, size_t name_len, - ElfW(Shdr) * out) { - char header_name[kMaxSectionNameLen]; - if (sizeof(header_name) < name_len) { - ABSL_RAW_LOG(WARNING, - "Section name '%s' is too long (%zu); " - "section will not be found (even if present).", - name, name_len); - // No point in even trying. - return false; - } - - 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; - } - 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 < 0) { - return false; - } else if (static_cast<size_t>(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; -} - -// Compare symbols at in the same address. -// Return true if we should pick symbol1. -static bool ShouldPickFirstSymbol(const ElfW(Sym) & symbol1, - const ElfW(Sym) & symbol2) { - // If one of the symbols is weak and the other is not, pick the one - // this is not a weak symbol. - char bind1 = ELF_ST_BIND(symbol1.st_info); - char bind2 = ELF_ST_BIND(symbol1.st_info); - if (bind1 == STB_WEAK && bind2 != STB_WEAK) return false; - if (bind2 == STB_WEAK && bind1 != STB_WEAK) return true; - - // If one of the symbols has zero size and the other is not, pick the - // one that has non-zero size. - if (symbol1.st_size != 0 && symbol2.st_size == 0) { - return true; - } - if (symbol1.st_size == 0 && symbol2.st_size != 0) { - return false; - } - - // If one of the symbols has no type and the other is not, pick the - // one that has a type. - char type1 = ELF_ST_TYPE(symbol1.st_info); - char type2 = ELF_ST_TYPE(symbol1.st_info); - if (type1 != STT_NOTYPE && type2 == STT_NOTYPE) { - return true; - } - if (type1 == STT_NOTYPE && type2 != STT_NOTYPE) { - return false; - } - - // Pick the first one, if we still cannot decide. - return true; -} - -// Return true if an address is inside a section. -static bool InSection(const void *address, const ElfW(Shdr) * section) { - const char *start = reinterpret_cast<const char *>(section->sh_addr); - size_t size = static_cast<size_t>(section->sh_size); - return start <= address && address < (start + size); -} - -static const char *ComputeOffset(const char *base, ptrdiff_t offset) { - // Note: cast to uintptr_t to avoid undefined behavior when base evaluates to - // zero and offset is non-zero. - return reinterpret_cast<const char *>( - reinterpret_cast<uintptr_t>(base) + offset); -} - -// 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". If the symbol is found, and its name fits in -// out_size, the name is written into out and SYMBOL_FOUND is returned. -// If the name does not fit, truncated name is written into out, -// and SYMBOL_TRUNCATED is returned. Out is NUL-terminated. -// If the symbol is not found, SYMBOL_NOT_FOUND is returned; -// To keep stack consumption low, we would like this function to not get -// inlined. -static ABSL_ATTRIBUTE_NOINLINE FindSymbolResult FindSymbol( - const void *const pc, const int fd, char *out, int out_size, - ptrdiff_t relocation, const ElfW(Shdr) * strtab, const ElfW(Shdr) * symtab, - const ElfW(Shdr) * opd, char *tmp_buf, int tmp_buf_size) { - if (symtab == nullptr) { - return SYMBOL_NOT_FOUND; - } - - // Read multiple symbols at once to save read() calls. - ElfW(Sym) *buf = reinterpret_cast<ElfW(Sym) *>(tmp_buf); - const int buf_entries = tmp_buf_size / sizeof(buf[0]); - - const int num_symbols = symtab->sh_size / symtab->sh_entsize; - - // On platforms using an .opd section (PowerPC & IA64), a function symbol - // has the address of a function descriptor, which contains the real - // starting address. However, we do not always want to use the real - // starting address because we sometimes want to symbolize a function - // pointer into the .opd section, e.g. FindSymbol(&foo,...). - const bool pc_in_opd = - kPlatformUsesOPDSections && opd != nullptr && InSection(pc, opd); - const bool deref_function_descriptor_pointer = - kPlatformUsesOPDSections && opd != nullptr && !pc_in_opd; - - ElfW(Sym) best_match; - SafeMemZero(&best_match, sizeof(best_match)); - bool found_match = false; - for (int i = 0; i < num_symbols;) { - off_t offset = symtab->sh_offset + i * symtab->sh_entsize; - const int num_remaining_symbols = num_symbols - i; - const int entries_in_chunk = std::min(num_remaining_symbols, buf_entries); - const int bytes_in_chunk = entries_in_chunk * sizeof(buf[0]); - const ssize_t len = ReadFromOffset(fd, buf, bytes_in_chunk, 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 <= entries_in_chunk); - for (int j = 0; j < num_symbols_in_buf; ++j) { - const ElfW(Sym) &symbol = buf[j]; - - // For a DSO, a symbol address is relocated by the loading address. - // We keep the original address for opd redirection below. - const char *const original_start_address = - reinterpret_cast<const char *>(symbol.st_value); - const char *start_address = - ComputeOffset(original_start_address, relocation); - - if (deref_function_descriptor_pointer && - InSection(original_start_address, opd)) { - // The opd section is mapped into memory. Just dereference - // start_address to get the first double word, which points to the - // function entry. - start_address = *reinterpret_cast<const char *const *>(start_address); - } - - // If pc is inside the .opd section, it points to a function descriptor. - const size_t size = pc_in_opd ? kFunctionDescriptorSize : symbol.st_size; - const void *const end_address = ComputeOffset(start_address, size); - if (symbol.st_value != 0 && // Skip null value symbols. - symbol.st_shndx != 0 && // Skip undefined symbols. -#ifdef STT_TLS - ELF_ST_TYPE(symbol.st_info) != STT_TLS && // Skip thread-local data. -#endif // STT_TLS - ((start_address <= pc && pc < end_address) || - (start_address == pc && pc == end_address))) { - if (!found_match || ShouldPickFirstSymbol(symbol, best_match)) { - found_match = true; - best_match = symbol; - } - } - } - i += num_symbols_in_buf; - } - - if (found_match) { - const size_t off = strtab->sh_offset + best_match.st_name; - const ssize_t n_read = ReadFromOffset(fd, out, out_size, off); - if (n_read <= 0) { - // This should never happen. - ABSL_RAW_LOG(WARNING, - "Unable to read from fd %d at offset %zu: n_read = %zd", fd, - off, n_read); - return SYMBOL_NOT_FOUND; - } - ABSL_RAW_CHECK(n_read <= out_size, "ReadFromOffset read too much data."); - - // strtab->sh_offset points into .strtab-like section that contains - // NUL-terminated strings: '\0foo\0barbaz\0...". - // - // sh_offset+st_name points to the start of symbol name, but we don't know - // how long the symbol is, so we try to read as much as we have space for, - // and usually over-read (i.e. there is a NUL somewhere before n_read). - if (memchr(out, '\0', n_read) == nullptr) { - // Either out_size was too small (n_read == out_size and no NUL), or - // we tried to read past the EOF (n_read < out_size) and .strtab is - // corrupt (missing terminating NUL; should never happen for valid ELF). - out[n_read - 1] = '\0'; - return SYMBOL_TRUNCATED; - } - return SYMBOL_FOUND; - } - - return SYMBOL_NOT_FOUND; -} - -// Get the symbol name of "pc" from the file pointed by "fd". Process -// both regular and dynamic symbol tables if necessary. -// See FindSymbol() comment for description of return value. -FindSymbolResult Symbolizer::GetSymbolFromObjectFile( - const ObjFile &obj, const void *const pc, const ptrdiff_t relocation, - char *out, int out_size, char *tmp_buf, int tmp_buf_size) { - ElfW(Shdr) symtab; - ElfW(Shdr) strtab; - ElfW(Shdr) opd; - ElfW(Shdr) *opd_ptr = nullptr; - - // On platforms using an .opd sections for function descriptor, read - // the section header. The .opd section is in data segment and should be - // loaded but we check that it is mapped just to be extra careful. - if (kPlatformUsesOPDSections) { - if (GetSectionHeaderByName(obj.fd, kOpdSectionName, - sizeof(kOpdSectionName) - 1, &opd) && - FindObjFile(reinterpret_cast<const char *>(opd.sh_addr) + relocation, - opd.sh_size) != nullptr) { - opd_ptr = &opd; - } else { - return SYMBOL_NOT_FOUND; - } - } - - // Consult a regular symbol table, then fall back to the dynamic symbol table. - for (const auto symbol_table_type : {SHT_SYMTAB, SHT_DYNSYM}) { - if (!GetSectionHeaderByType(obj.fd, obj.elf_header.e_shnum, - obj.elf_header.e_shoff, symbol_table_type, - &symtab, tmp_buf, tmp_buf_size)) { - continue; - } - if (!ReadFromOffsetExact( - obj.fd, &strtab, sizeof(strtab), - obj.elf_header.e_shoff + symtab.sh_link * sizeof(symtab))) { - continue; - } - const FindSymbolResult rc = - FindSymbol(pc, obj.fd, out, out_size, relocation, &strtab, &symtab, - opd_ptr, tmp_buf, tmp_buf_size); - if (rc != SYMBOL_NOT_FOUND) { - return rc; - } - } - - return SYMBOL_NOT_FOUND; -} - -namespace { -// Thin wrapper around a file descriptor so that the file descriptor -// gets closed for sure. -class FileDescriptor { - public: - explicit FileDescriptor(int fd) : fd_(fd) {} - FileDescriptor(const FileDescriptor &) = delete; - FileDescriptor &operator=(const FileDescriptor &) = delete; - - ~FileDescriptor() { - if (fd_ >= 0) { - NO_INTR(close(fd_)); - } - } - - int get() const { return fd_; } - - private: - const int fd_; -}; - -// 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) - : fd_(fd), - buf_len_(buf_len), - buf_(buf), - bol_(buf), - eol_(buf), - eod_(buf) {} - - LineReader(const LineReader &) = delete; - LineReader &operator=(const LineReader &) = delete; - - // 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 = ReadPersistent(fd_, buf_, buf_len_); - if (num_bytes <= 0) { // EOF or error. - return false; - } - 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 = - ReadPersistent(fd_, append_pos, capacity_left); - if (num_bytes <= 0) { // EOF or error. - return false; - } - eod_ = append_pos + num_bytes; - bol_ = buf_; - } - } - eol_ = FindLineFeed(); - if (eol_ == nullptr) { // '\n' not found. Malformed line. - return false; - } - *eol_ = '\0'; // Replace '\n' with '\0'. - - *bol = bol_; - *eol = eol_; - return true; - } - - private: - char *FindLineFeed() const { - return reinterpret_cast<char *>(memchr(bol_, '\n', eod_ - bol_)); - } - - bool BufferIsEmpty() const { return buf_ == eod_; } - - bool HasCompleteLine() const { - return !BufferIsEmpty() && FindLineFeed() != nullptr; - } - - const int fd_; - const int buf_len_; - char *const buf_; - 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 const char *GetHex(const char *start, const char *end, - uint64_t *const value) { - uint64_t 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); - *value = hex; - return p; -} - -static const char *GetHex(const char *start, const char *end, - const void **const addr) { - uint64_t hex = 0; - const char *p = GetHex(start, end, &hex); - *addr = reinterpret_cast<void *>(hex); - return p; -} - -// Normally we are only interested in "r?x" maps. -// On the PowerPC, function pointers point to descriptors in the .opd -// section. The descriptors themselves are not executable code, so -// we need to relax the check below to "r??". -static bool ShouldUseMapping(const char *const flags) { - return flags[0] == 'r' && (kPlatformUsesOPDSections || flags[2] == 'x'); -} - -// Read /proc/self/maps and run "callback" for each mmapped file found. If -// "callback" returns false, stop scanning and return true. Else continue -// scanning /proc/self/maps. Return true if no parse error is found. -static ABSL_ATTRIBUTE_NOINLINE bool ReadAddrMap( - bool (*callback)(const char *filename, const void *const start_addr, - const void *const end_addr, uint64_t offset, void *arg), - void *arg, void *tmp_buf, int tmp_buf_size) { - // Use /proc/self/task/<pid>/maps instead of /proc/self/maps. The latter - // requires kernel to stop all threads, and is significantly slower when there - // are 1000s of threads. - char maps_path[80]; - snprintf(maps_path, sizeof(maps_path), "/proc/self/task/%d/maps", getpid()); - - int maps_fd; - NO_INTR(maps_fd = open(maps_path, O_RDONLY)); - FileDescriptor wrapped_maps_fd(maps_fd); - if (wrapped_maps_fd.get() < 0) { - ABSL_RAW_LOG(WARNING, "%s: errno=%d", maps_path, errno); - return false; - } - - // Iterate over maps and look for the map containing the pc. Then - // look into the symbol tables inside. - LineReader reader(wrapped_maps_fd.get(), static_cast<char *>(tmp_buf), - tmp_buf_size); - while (true) { - const char *cursor; - const char *eol; - if (!reader.ReadLine(&cursor, &eol)) { // EOF or malformed line. - break; - } - - const char *line = cursor; - const void *start_address; - // 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 != '-') { - ABSL_RAW_LOG(WARNING, "Corrupt /proc/self/maps line: %s", line); - return false; - } - ++cursor; // Skip '-'. - - // Read end address. - const void *end_address; - cursor = GetHex(cursor, eol, &end_address); - if (cursor == eol || *cursor != ' ') { - ABSL_RAW_LOG(WARNING, "Corrupt /proc/self/maps line: %s", line); - return false; - } - ++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) { - ABSL_RAW_LOG(WARNING, "Corrupt /proc/self/maps: %s", line); - return false; - } - - // Check flags. - if (!ShouldUseMapping(flags_start)) { - continue; // We skip this map. - } - ++cursor; // Skip ' '. - - // Read file offset. - uint64_t offset; - cursor = GetHex(cursor, eol, &offset); - ++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; - } - - // Check whether this entry corresponds to our hint table for the true - // filename. - bool hinted = - GetFileMappingHint(&start_address, &end_address, &offset, &cursor); - if (!hinted && (cursor == eol || cursor[0] == '[')) { - // not an object file, typically [vdso] or [vsyscall] - continue; - } - if (!callback(cursor, start_address, end_address, offset, arg)) break; - } - return true; -} - -// Find the objfile mapped in address region containing [addr, addr + len). -ObjFile *Symbolizer::FindObjFile(const void *const addr, size_t len) { - for (int i = 0; i < 2; ++i) { - if (!ok_) return nullptr; - - // Read /proc/self/maps if necessary - if (!addr_map_read_) { - addr_map_read_ = true; - if (!ReadAddrMap(RegisterObjFile, this, tmp_buf_, TMP_BUF_SIZE)) { - ok_ = false; - return nullptr; - } - } - - int lo = 0; - int hi = addr_map_.Size(); - while (lo < hi) { - int mid = (lo + hi) / 2; - if (addr < addr_map_.At(mid)->end_addr) { - hi = mid; - } else { - lo = mid + 1; - } - } - if (lo != addr_map_.Size()) { - ObjFile *obj = addr_map_.At(lo); - SAFE_ASSERT(obj->end_addr > addr); - if (addr >= obj->start_addr && - reinterpret_cast<const char *>(addr) + len <= obj->end_addr) - return obj; - } - - // The address mapping may have changed since it was last read. Retry. - ClearAddrMap(); - } - return nullptr; -} - -void Symbolizer::ClearAddrMap() { - for (int i = 0; i != addr_map_.Size(); i++) { - ObjFile *o = addr_map_.At(i); - base_internal::LowLevelAlloc::Free(o->filename); - if (o->fd >= 0) { - NO_INTR(close(o->fd)); - } - } - addr_map_.Clear(); - addr_map_read_ = false; -} - -// Callback for ReadAddrMap to register objfiles in an in-memory table. -bool Symbolizer::RegisterObjFile(const char *filename, - const void *const start_addr, - const void *const end_addr, uint64_t offset, - void *arg) { - Symbolizer *impl = static_cast<Symbolizer *>(arg); - - // Files are supposed to be added in the increasing address order. Make - // sure that's the case. - int addr_map_size = impl->addr_map_.Size(); - if (addr_map_size != 0) { - ObjFile *old = impl->addr_map_.At(addr_map_size - 1); - if (old->end_addr > end_addr) { - ABSL_RAW_LOG(ERROR, - "Unsorted addr map entry: 0x%" PRIxPTR ": %s <-> 0x%" PRIxPTR - ": %s", - reinterpret_cast<uintptr_t>(end_addr), filename, - reinterpret_cast<uintptr_t>(old->end_addr), old->filename); - return true; - } else if (old->end_addr == end_addr) { - // The same entry appears twice. This sometimes happens for [vdso]. - if (old->start_addr != start_addr || - strcmp(old->filename, filename) != 0) { - ABSL_RAW_LOG(ERROR, - "Duplicate addr 0x%" PRIxPTR ": %s <-> 0x%" PRIxPTR ": %s", - reinterpret_cast<uintptr_t>(end_addr), filename, - reinterpret_cast<uintptr_t>(old->end_addr), old->filename); - } - return true; - } - } - ObjFile *obj = impl->addr_map_.Add(); - obj->filename = impl->CopyString(filename); - obj->start_addr = start_addr; - obj->end_addr = end_addr; - obj->offset = offset; - obj->elf_type = -1; // filled on demand - obj->fd = -1; // opened on demand - return true; -} - -// 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 ABSL_ATTRIBUTE_NOINLINE void DemangleInplace(char *out, int out_size, - char *tmp_buf, - int tmp_buf_size) { - if (Demangle(out, tmp_buf, tmp_buf_size)) { - // Demangling succeeded. Copy to out if the space allows. - int len = strlen(tmp_buf); - if (len + 1 <= out_size) { // +1 for '\0'. - SAFE_ASSERT(len < tmp_buf_size); - memmove(out, tmp_buf, len + 1); - } - } -} - -SymbolCacheLine *Symbolizer::GetCacheLine(const void *const pc) { - uintptr_t pc0 = reinterpret_cast<uintptr_t>(pc); - pc0 >>= 3; // drop the low 3 bits - - // Shuffle bits. - pc0 ^= (pc0 >> 6) ^ (pc0 >> 12) ^ (pc0 >> 18); - return &symbol_cache_[pc0 % SYMBOL_CACHE_LINES]; -} - -void Symbolizer::AgeSymbols(SymbolCacheLine *line) { - for (uint32_t &age : line->age) { - ++age; - } -} - -const char *Symbolizer::FindSymbolInCache(const void *const pc) { - if (pc == nullptr) return nullptr; - - SymbolCacheLine *line = GetCacheLine(pc); - for (size_t i = 0; i < ABSL_ARRAYSIZE(line->pc); ++i) { - if (line->pc[i] == pc) { - AgeSymbols(line); - line->age[i] = 0; - return line->name[i]; - } - } - return nullptr; -} - -const char *Symbolizer::InsertSymbolInCache(const void *const pc, - const char *name) { - SAFE_ASSERT(pc != nullptr); - - SymbolCacheLine *line = GetCacheLine(pc); - uint32_t max_age = 0; - int oldest_index = -1; - for (size_t i = 0; i < ABSL_ARRAYSIZE(line->pc); ++i) { - if (line->pc[i] == nullptr) { - AgeSymbols(line); - line->pc[i] = pc; - line->name[i] = CopyString(name); - line->age[i] = 0; - return line->name[i]; - } - if (line->age[i] >= max_age) { - max_age = line->age[i]; - oldest_index = i; - } - } - - AgeSymbols(line); - ABSL_RAW_CHECK(oldest_index >= 0, "Corrupt cache"); - base_internal::LowLevelAlloc::Free(line->name[oldest_index]); - line->pc[oldest_index] = pc; - line->name[oldest_index] = CopyString(name); - line->age[oldest_index] = 0; - return line->name[oldest_index]; -} - -static void MaybeOpenFdFromSelfExe(ObjFile *obj) { - if (memcmp(obj->start_addr, ELFMAG, SELFMAG) != 0) { - return; - } - int fd = open("/proc/self/exe", O_RDONLY); - if (fd == -1) { - return; - } - // Verify that contents of /proc/self/exe matches in-memory image of - // the binary. This can fail if the "deleted" binary is in fact not - // the main executable, or for binaries that have the first PT_LOAD - // segment smaller than 4K. We do it in four steps so that the - // buffer is smaller and we don't consume too much stack space. - const char *mem = reinterpret_cast<const char *>(obj->start_addr); - for (int i = 0; i < 4; ++i) { - char buf[1024]; - ssize_t n = read(fd, buf, sizeof(buf)); - if (n != sizeof(buf) || memcmp(buf, mem, sizeof(buf)) != 0) { - close(fd); - return; - } - mem += sizeof(buf); - } - obj->fd = fd; -} - -static bool MaybeInitializeObjFile(ObjFile *obj) { - if (obj->fd < 0) { - obj->fd = open(obj->filename, O_RDONLY); - - if (obj->fd < 0) { - // Getting /proc/self/exe here means that we were hinted. - if (strcmp(obj->filename, "/proc/self/exe") == 0) { - // /proc/self/exe may be inaccessible (due to setuid, etc.), so try - // accessing the binary via argv0. - if (argv0_value != nullptr) { - obj->fd = open(argv0_value, O_RDONLY); - } - } else { - MaybeOpenFdFromSelfExe(obj); - } - } - - if (obj->fd < 0) { - ABSL_RAW_LOG(WARNING, "%s: open failed: errno=%d", obj->filename, errno); - return false; - } - obj->elf_type = FileGetElfType(obj->fd); - if (obj->elf_type < 0) { - ABSL_RAW_LOG(WARNING, "%s: wrong elf type: %d", obj->filename, - obj->elf_type); - return false; - } - - if (!ReadFromOffsetExact(obj->fd, &obj->elf_header, sizeof(obj->elf_header), - 0)) { - ABSL_RAW_LOG(WARNING, "%s: failed to read elf header", obj->filename); - return false; - } - const int phnum = obj->elf_header.e_phnum; - const int phentsize = obj->elf_header.e_phentsize; - size_t phoff = obj->elf_header.e_phoff; - size_t num_executable_load_segments = 0; - for (int j = 0; j < phnum; j++) { - ElfW(Phdr) phdr; - if (!ReadFromOffsetExact(obj->fd, &phdr, sizeof(phdr), phoff)) { - ABSL_RAW_LOG(WARNING, "%s: failed to read program header %d", - obj->filename, j); - return false; - } - phoff += phentsize; - constexpr int rx = PF_X | PF_R; - if (phdr.p_type != PT_LOAD || (phdr.p_flags & rx) != rx) { - // Not a LOAD segment, or not executable code. - continue; - } - if (num_executable_load_segments < obj->phdr.size()) { - memcpy(&obj->phdr[num_executable_load_segments++], &phdr, sizeof(phdr)); - } else { - ABSL_RAW_LOG(WARNING, "%s: too many executable LOAD segments", - obj->filename); - break; - } - } - if (num_executable_load_segments == 0) { - // This object has no "r-x" LOAD segments. That's unexpected. - ABSL_RAW_LOG(WARNING, "%s: no executable LOAD segments", obj->filename); - return false; - } - } - return true; -} - -// The implementation of our symbolization routine. If it -// successfully finds the symbol containing "pc" and obtains the -// symbol name, returns pointer to that symbol. Otherwise, returns nullptr. -// If any symbol decorators have been installed via InstallSymbolDecorator(), -// they are called here as well. -// To keep stack consumption low, we would like this function to not -// get inlined. -const char *Symbolizer::GetSymbol(const void *const pc) { - const char *entry = FindSymbolInCache(pc); - if (entry != nullptr) { - return entry; - } - symbol_buf_[0] = '\0'; - - ObjFile *const obj = FindObjFile(pc, 1); - ptrdiff_t relocation = 0; - int fd = -1; - if (obj != nullptr) { - if (MaybeInitializeObjFile(obj)) { - const size_t start_addr = reinterpret_cast<size_t>(obj->start_addr); - if (obj->elf_type == ET_DYN && start_addr >= obj->offset) { - // This object was relocated. - // - // For obj->offset > 0, adjust the relocation since a mapping at offset - // X in the file will have a start address of [true relocation]+X. - relocation = start_addr - obj->offset; - - // Note: some binaries have multiple "rx" LOAD segments. We must - // find the right one. - ElfW(Phdr) *phdr = nullptr; - for (size_t j = 0; j < obj->phdr.size(); j++) { - ElfW(Phdr) &p = obj->phdr[j]; - if (p.p_type != PT_LOAD) { - // We only expect PT_LOADs. This must be PT_NULL that we didn't - // write over (i.e. we exhausted all interesting PT_LOADs). - ABSL_RAW_CHECK(p.p_type == PT_NULL, "unexpected p_type"); - break; - } - if (pc < reinterpret_cast<void *>(start_addr + p.p_memsz)) { - phdr = &p; - break; - } - } - if (phdr == nullptr) { - // That's unexpected. Hope for the best. - ABSL_RAW_LOG( - WARNING, - "%s: unable to find LOAD segment for pc: %p, start_addr: %zx", - obj->filename, pc, start_addr); - } else { - // Adjust relocation in case phdr.p_vaddr != 0. - // This happens for binaries linked with `lld --rosegment`, and for - // binaries linked with BFD `ld -z separate-code`. - relocation -= phdr->p_vaddr - phdr->p_offset; - } - } - - fd = obj->fd; - if (GetSymbolFromObjectFile(*obj, pc, relocation, symbol_buf_, - sizeof(symbol_buf_), tmp_buf_, - sizeof(tmp_buf_)) == SYMBOL_FOUND) { - // Only try to demangle the symbol name if it fit into symbol_buf_. - DemangleInplace(symbol_buf_, sizeof(symbol_buf_), tmp_buf_, - sizeof(tmp_buf_)); - } - } - } else { -#if ABSL_HAVE_VDSO_SUPPORT - VDSOSupport vdso; - if (vdso.IsPresent()) { - VDSOSupport::SymbolInfo symbol_info; - if (vdso.LookupSymbolByAddress(pc, &symbol_info)) { - // All VDSO symbols are known to be short. - size_t len = strlen(symbol_info.name); - ABSL_RAW_CHECK(len + 1 < sizeof(symbol_buf_), - "VDSO symbol unexpectedly long"); - memcpy(symbol_buf_, symbol_info.name, len + 1); - } - } -#endif - } - - if (g_decorators_mu.TryLock()) { - if (g_num_decorators > 0) { - SymbolDecoratorArgs decorator_args = { - pc, relocation, fd, symbol_buf_, sizeof(symbol_buf_), - tmp_buf_, sizeof(tmp_buf_), nullptr}; - for (int i = 0; i < g_num_decorators; ++i) { - decorator_args.arg = g_decorators[i].arg; - g_decorators[i].fn(&decorator_args); - } - } - g_decorators_mu.Unlock(); - } - if (symbol_buf_[0] == '\0') { - return nullptr; - } - symbol_buf_[sizeof(symbol_buf_) - 1] = '\0'; // Paranoia. - return InsertSymbolInCache(pc, symbol_buf_); -} - -bool RemoveAllSymbolDecorators(void) { - if (!g_decorators_mu.TryLock()) { - // Someone else is using decorators. Get out. - return false; - } - g_num_decorators = 0; - g_decorators_mu.Unlock(); - return true; -} - -bool RemoveSymbolDecorator(int ticket) { - if (!g_decorators_mu.TryLock()) { - // Someone else is using decorators. Get out. - return false; - } - for (int i = 0; i < g_num_decorators; ++i) { - if (g_decorators[i].ticket == ticket) { - while (i < g_num_decorators - 1) { - g_decorators[i] = g_decorators[i + 1]; - ++i; - } - g_num_decorators = i; - break; - } - } - g_decorators_mu.Unlock(); - return true; // Decorator is known to be removed. -} - -int InstallSymbolDecorator(SymbolDecorator decorator, void *arg) { - static int ticket = 0; - - if (!g_decorators_mu.TryLock()) { - // Someone else is using decorators. Get out. - return -2; - } - int ret = ticket; - if (g_num_decorators >= kMaxDecorators) { - ret = -1; - } else { - g_decorators[g_num_decorators] = {decorator, arg, ticket++}; - ++g_num_decorators; - } - g_decorators_mu.Unlock(); - return ret; -} - -bool RegisterFileMappingHint(const void *start, const void *end, uint64_t offset, - const char *filename) { - SAFE_ASSERT(start <= end); - SAFE_ASSERT(filename != nullptr); - - InitSigSafeArena(); - - if (!g_file_mapping_mu.TryLock()) { - return false; - } - - bool ret = true; - if (g_num_file_mapping_hints >= kMaxFileMappingHints) { - ret = false; - } else { - // TODO(ckennelly): Move this into a string copy routine. - int len = strlen(filename); - char *dst = static_cast<char *>( - base_internal::LowLevelAlloc::AllocWithArena(len + 1, SigSafeArena())); - ABSL_RAW_CHECK(dst != nullptr, "out of memory"); - memcpy(dst, filename, len + 1); - - auto &hint = g_file_mapping_hints[g_num_file_mapping_hints++]; - hint.start = start; - hint.end = end; - hint.offset = offset; - hint.filename = dst; - } - - g_file_mapping_mu.Unlock(); - return ret; -} - -bool GetFileMappingHint(const void **start, const void **end, uint64_t *offset, - const char **filename) { - if (!g_file_mapping_mu.TryLock()) { - return false; - } - bool found = false; - for (int i = 0; i < g_num_file_mapping_hints; i++) { - if (g_file_mapping_hints[i].start <= *start && - *end <= g_file_mapping_hints[i].end) { - // We assume that the start_address for the mapping is the base - // address of the ELF section, but when [start_address,end_address) is - // not strictly equal to [hint.start, hint.end), that assumption is - // invalid. - // - // This uses the hint's start address (even though hint.start is not - // necessarily equal to start_address) to ensure the correct - // relocation is computed later. - *start = g_file_mapping_hints[i].start; - *end = g_file_mapping_hints[i].end; - *offset = g_file_mapping_hints[i].offset; - *filename = g_file_mapping_hints[i].filename; - found = true; - break; - } - } - g_file_mapping_mu.Unlock(); - return found; -} - -} // namespace debugging_internal - -bool Symbolize(const void *pc, char *out, int out_size) { - // Symbolization is very slow under tsan. - ABSL_ANNOTATE_IGNORE_READS_AND_WRITES_BEGIN(); - SAFE_ASSERT(out_size >= 0); - debugging_internal::Symbolizer *s = debugging_internal::AllocateSymbolizer(); - const char *name = s->GetSymbol(pc); - bool ok = false; - if (name != nullptr && out_size > 0) { - strncpy(out, name, out_size); - ok = true; - if (out[out_size - 1] != '\0') { - // strncpy() does not '\0' terminate when it truncates. Do so, with - // trailing ellipsis. - static constexpr char kEllipsis[] = "..."; - int ellipsis_size = - std::min(implicit_cast<int>(strlen(kEllipsis)), out_size - 1); - memcpy(out + out_size - ellipsis_size - 1, kEllipsis, ellipsis_size); - out[out_size - 1] = '\0'; - } - } - debugging_internal::FreeSymbolizer(s); - ABSL_ANNOTATE_IGNORE_READS_AND_WRITES_END(); - return ok; -} - -ABSL_NAMESPACE_END -} // namespace absl - -extern "C" bool AbslInternalGetFileMappingHint(const void **start, - const void **end, uint64_t *offset, - const char **filename) { - return absl::debugging_internal::GetFileMappingHint(start, end, offset, - filename); -} diff --git a/third_party/abseil_cpp/absl/debugging/symbolize_test.cc b/third_party/abseil_cpp/absl/debugging/symbolize_test.cc deleted file mode 100644 index a2dd4956c497..000000000000 --- a/third_party/abseil_cpp/absl/debugging/symbolize_test.cc +++ /dev/null @@ -1,557 +0,0 @@ -// Copyright 2018 The Abseil Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// https://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -#include "absl/debugging/symbolize.h" - -#ifndef _WIN32 -#include <fcntl.h> -#include <sys/mman.h> -#endif - -#include <cstring> -#include <iostream> -#include <memory> - -#include "gmock/gmock.h" -#include "gtest/gtest.h" -#include "absl/base/attributes.h" -#include "absl/base/casts.h" -#include "absl/base/config.h" -#include "absl/base/internal/per_thread_tls.h" -#include "absl/base/internal/raw_logging.h" -#include "absl/base/optimization.h" -#include "absl/debugging/internal/stack_consumption.h" -#include "absl/memory/memory.h" -#include "absl/strings/string_view.h" - -using testing::Contains; - -#ifdef _WIN32 -#define ABSL_SYMBOLIZE_TEST_NOINLINE __declspec(noinline) -#else -#define ABSL_SYMBOLIZE_TEST_NOINLINE ABSL_ATTRIBUTE_NOINLINE -#endif - -// Functions to symbolize. Use C linkage to avoid mangled names. -extern "C" { -ABSL_SYMBOLIZE_TEST_NOINLINE void nonstatic_func() { - // The next line makes this a unique function to prevent the compiler from - // folding identical functions together. - volatile int x = __LINE__; - static_cast<void>(x); - ABSL_BLOCK_TAIL_CALL_OPTIMIZATION(); -} - -ABSL_SYMBOLIZE_TEST_NOINLINE static void static_func() { - // The next line makes this a unique function to prevent the compiler from - // folding identical functions together. - volatile int x = __LINE__; - static_cast<void>(x); - ABSL_BLOCK_TAIL_CALL_OPTIMIZATION(); -} -} // extern "C" - -struct Foo { - static void func(int x); -}; - -// A C++ method that should have a mangled name. -ABSL_SYMBOLIZE_TEST_NOINLINE void Foo::func(int) { - // The next line makes this a unique function to prevent the compiler from - // folding identical functions together. - volatile int x = __LINE__; - static_cast<void>(x); - ABSL_BLOCK_TAIL_CALL_OPTIMIZATION(); -} - -// Create functions that will remain in different text sections in the -// final binary when linker option "-z,keep-text-section-prefix" is used. -int ABSL_ATTRIBUTE_SECTION_VARIABLE(.text.unlikely) unlikely_func() { - return 0; -} - -int ABSL_ATTRIBUTE_SECTION_VARIABLE(.text.hot) hot_func() { - return 0; -} - -int ABSL_ATTRIBUTE_SECTION_VARIABLE(.text.startup) startup_func() { - return 0; -} - -int ABSL_ATTRIBUTE_SECTION_VARIABLE(.text.exit) exit_func() { - return 0; -} - -int /*ABSL_ATTRIBUTE_SECTION_VARIABLE(.text)*/ regular_func() { - return 0; -} - -// Thread-local data may confuse the symbolizer, ensure that it does not. -// Variable sizes and order are important. -#if ABSL_PER_THREAD_TLS -static ABSL_PER_THREAD_TLS_KEYWORD char symbolize_test_thread_small[1]; -static ABSL_PER_THREAD_TLS_KEYWORD char - symbolize_test_thread_big[2 * 1024 * 1024]; -#endif - -#if !defined(__EMSCRIPTEN__) -// Used below to hopefully inhibit some compiler/linker optimizations -// that may remove kHpageTextPadding, kPadding0, and kPadding1 from -// the binary. -static volatile bool volatile_bool = false; - -// Force the binary to be large enough that a THP .text remap will succeed. -static constexpr size_t kHpageSize = 1 << 21; -const char kHpageTextPadding[kHpageSize * 4] ABSL_ATTRIBUTE_SECTION_VARIABLE( - .text) = ""; -#endif // !defined(__EMSCRIPTEN__) - -static char try_symbolize_buffer[4096]; - -// A wrapper function for absl::Symbolize() to make the unit test simple. The -// limit must be < sizeof(try_symbolize_buffer). Returns null if -// absl::Symbolize() returns false, otherwise returns try_symbolize_buffer with -// the result of absl::Symbolize(). -static const char *TrySymbolizeWithLimit(void *pc, int limit) { - ABSL_RAW_CHECK(limit <= sizeof(try_symbolize_buffer), - "try_symbolize_buffer is too small"); - - // Use the heap to facilitate heap and buffer sanitizer tools. - auto heap_buffer = absl::make_unique<char[]>(sizeof(try_symbolize_buffer)); - bool found = absl::Symbolize(pc, heap_buffer.get(), limit); - if (found) { - ABSL_RAW_CHECK(strnlen(heap_buffer.get(), limit) < limit, - "absl::Symbolize() did not properly terminate the string"); - strncpy(try_symbolize_buffer, heap_buffer.get(), - sizeof(try_symbolize_buffer) - 1); - try_symbolize_buffer[sizeof(try_symbolize_buffer) - 1] = '\0'; - } - - return found ? try_symbolize_buffer : nullptr; -} - -// A wrapper for TrySymbolizeWithLimit(), with a large limit. -static const char *TrySymbolize(void *pc) { - return TrySymbolizeWithLimit(pc, sizeof(try_symbolize_buffer)); -} - -#if defined(ABSL_INTERNAL_HAVE_ELF_SYMBOLIZE) || \ - defined(ABSL_INTERNAL_HAVE_DARWIN_SYMBOLIZE) - -TEST(Symbolize, Cached) { - // 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)); - EXPECT_TRUE(strcmp("static_func", static_func_symbol) == 0 || - strcmp("static_func()", static_func_symbol) == 0); - - EXPECT_TRUE(nullptr == TrySymbolize(nullptr)); -} - -TEST(Symbolize, Truncation) { - constexpr char kNonStaticFunc[] = "nonstatic_func"; - EXPECT_STREQ("nonstatic_func", - TrySymbolizeWithLimit((void *)(&nonstatic_func), - strlen(kNonStaticFunc) + 1)); - EXPECT_STREQ("nonstatic_...", - TrySymbolizeWithLimit((void *)(&nonstatic_func), - strlen(kNonStaticFunc) + 0)); - EXPECT_STREQ("nonstatic...", - TrySymbolizeWithLimit((void *)(&nonstatic_func), - strlen(kNonStaticFunc) - 1)); - EXPECT_STREQ("n...", TrySymbolizeWithLimit((void *)(&nonstatic_func), 5)); - EXPECT_STREQ("...", TrySymbolizeWithLimit((void *)(&nonstatic_func), 4)); - EXPECT_STREQ("..", TrySymbolizeWithLimit((void *)(&nonstatic_func), 3)); - EXPECT_STREQ(".", TrySymbolizeWithLimit((void *)(&nonstatic_func), 2)); - EXPECT_STREQ("", TrySymbolizeWithLimit((void *)(&nonstatic_func), 1)); - EXPECT_EQ(nullptr, TrySymbolizeWithLimit((void *)(&nonstatic_func), 0)); -} - -TEST(Symbolize, SymbolizeWithDemangling) { - Foo::func(100); - EXPECT_STREQ("Foo::func()", TrySymbolize((void *)(&Foo::func))); -} - -TEST(Symbolize, SymbolizeSplitTextSections) { - EXPECT_STREQ("unlikely_func()", TrySymbolize((void *)(&unlikely_func))); - EXPECT_STREQ("hot_func()", TrySymbolize((void *)(&hot_func))); - EXPECT_STREQ("startup_func()", TrySymbolize((void *)(&startup_func))); - EXPECT_STREQ("exit_func()", TrySymbolize((void *)(&exit_func))); - EXPECT_STREQ("regular_func()", TrySymbolize((void *)(®ular_func))); -} - -// Tests that verify that Symbolize stack footprint is within some limit. -#ifdef ABSL_INTERNAL_HAVE_DEBUGGING_STACK_CONSUMPTION - -static void *g_pc_to_symbolize; -static char g_symbolize_buffer[4096]; -static char *g_symbolize_result; - -static void SymbolizeSignalHandler(int signo) { - if (absl::Symbolize(g_pc_to_symbolize, g_symbolize_buffer, - sizeof(g_symbolize_buffer))) { - g_symbolize_result = g_symbolize_buffer; - } else { - g_symbolize_result = nullptr; - } -} - -// 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; - *stack_consumed = absl::debugging_internal::GetSignalHandlerStackConsumption( - SymbolizeSignalHandler); - return g_symbolize_result; -} - -static int GetStackConsumptionUpperLimit() { - // Symbolize stack consumption should be within 2kB. - int stack_consumption_upper_limit = 2048; -#if defined(ABSL_HAVE_ADDRESS_SANITIZER) || \ - defined(ABSL_HAVE_MEMORY_SANITIZER) || defined(ABSL_HAVE_THREAD_SANITIZER) - // Account for sanitizer instrumentation requiring additional stack space. - stack_consumption_upper_limit *= 5; -#endif - return stack_consumption_upper_limit; -} - -TEST(Symbolize, SymbolizeStackConsumption) { - int stack_consumed = 0; - - const char *symbol = - SymbolizeStackConsumption((void *)(&nonstatic_func), &stack_consumed); - EXPECT_STREQ("nonstatic_func", symbol); - EXPECT_GT(stack_consumed, 0); - EXPECT_LT(stack_consumed, GetStackConsumptionUpperLimit()); - - // 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); - EXPECT_TRUE(strcmp("static_func", symbol) == 0 || - strcmp("static_func()", symbol) == 0); - EXPECT_GT(stack_consumed, 0); - EXPECT_LT(stack_consumed, GetStackConsumptionUpperLimit()); -} - -TEST(Symbolize, SymbolizeWithDemanglingStackConsumption) { - Foo::func(100); - int stack_consumed = 0; - - const char *symbol = - SymbolizeStackConsumption((void *)(&Foo::func), &stack_consumed); - - EXPECT_STREQ("Foo::func()", symbol); - EXPECT_GT(stack_consumed, 0); - EXPECT_LT(stack_consumed, GetStackConsumptionUpperLimit()); -} - -#endif // ABSL_INTERNAL_HAVE_DEBUGGING_STACK_CONSUMPTION - -#ifndef ABSL_INTERNAL_HAVE_DARWIN_SYMBOLIZE -// Use a 64K page size for PPC. -const size_t kPageSize = 64 << 10; -// We place a read-only symbols into the .text section and verify that we can -// symbolize them and other symbols after remapping them. -const char kPadding0[kPageSize * 4] ABSL_ATTRIBUTE_SECTION_VARIABLE(.text) = - ""; -const char kPadding1[kPageSize * 4] ABSL_ATTRIBUTE_SECTION_VARIABLE(.text) = - ""; - -static int FilterElfHeader(struct dl_phdr_info *info, size_t size, void *data) { - for (int i = 0; i < info->dlpi_phnum; i++) { - if (info->dlpi_phdr[i].p_type == PT_LOAD && - info->dlpi_phdr[i].p_flags == (PF_R | PF_X)) { - const void *const vaddr = - absl::bit_cast<void *>(info->dlpi_addr + info->dlpi_phdr[i].p_vaddr); - const auto segsize = info->dlpi_phdr[i].p_memsz; - - const char *self_exe; - if (info->dlpi_name != nullptr && info->dlpi_name[0] != '\0') { - self_exe = info->dlpi_name; - } else { - self_exe = "/proc/self/exe"; - } - - absl::debugging_internal::RegisterFileMappingHint( - vaddr, reinterpret_cast<const char *>(vaddr) + segsize, - info->dlpi_phdr[i].p_offset, self_exe); - - return 1; - } - } - - return 1; -} - -TEST(Symbolize, SymbolizeWithMultipleMaps) { - // Force kPadding0 and kPadding1 to be linked in. - if (volatile_bool) { - ABSL_RAW_LOG(INFO, "%s", kPadding0); - ABSL_RAW_LOG(INFO, "%s", kPadding1); - } - - // Verify we can symbolize everything. - char buf[512]; - memset(buf, 0, sizeof(buf)); - absl::Symbolize(kPadding0, buf, sizeof(buf)); - EXPECT_STREQ("kPadding0", buf); - - memset(buf, 0, sizeof(buf)); - absl::Symbolize(kPadding1, buf, sizeof(buf)); - EXPECT_STREQ("kPadding1", buf); - - // Specify a hint for the executable segment. - dl_iterate_phdr(FilterElfHeader, nullptr); - - // Reload at least one page out of kPadding0, kPadding1 - const char *ptrs[] = {kPadding0, kPadding1}; - - for (const char *ptr : ptrs) { - const int kMapFlags = MAP_ANONYMOUS | MAP_PRIVATE; - void *addr = mmap(nullptr, kPageSize, PROT_READ, kMapFlags, 0, 0); - ASSERT_NE(addr, MAP_FAILED); - - // kPadding[0-1] is full of zeroes, so we can remap anywhere within it, but - // we ensure there is at least a full page of padding. - void *remapped = reinterpret_cast<void *>( - reinterpret_cast<uintptr_t>(ptr + kPageSize) & ~(kPageSize - 1ULL)); - - const int kMremapFlags = (MREMAP_MAYMOVE | MREMAP_FIXED); - void *ret = mremap(addr, kPageSize, kPageSize, kMremapFlags, remapped); - ASSERT_NE(ret, MAP_FAILED); - } - - // Invalidate the symbolization cache so we are forced to rely on the hint. - absl::Symbolize(nullptr, buf, sizeof(buf)); - - // Verify we can still symbolize. - const char *expected[] = {"kPadding0", "kPadding1"}; - const size_t offsets[] = {0, kPageSize, 2 * kPageSize, 3 * kPageSize}; - - for (int i = 0; i < 2; i++) { - for (size_t offset : offsets) { - memset(buf, 0, sizeof(buf)); - absl::Symbolize(ptrs[i] + offset, buf, sizeof(buf)); - EXPECT_STREQ(expected[i], buf); - } - } -} - -// Appends string(*args->arg) to args->symbol_buf. -static void DummySymbolDecorator( - const absl::debugging_internal::SymbolDecoratorArgs *args) { - std::string *message = static_cast<std::string *>(args->arg); - strncat(args->symbol_buf, message->c_str(), - args->symbol_buf_size - strlen(args->symbol_buf) - 1); -} - -TEST(Symbolize, InstallAndRemoveSymbolDecorators) { - int ticket_a; - std::string a_message("a"); - EXPECT_GE(ticket_a = absl::debugging_internal::InstallSymbolDecorator( - DummySymbolDecorator, &a_message), - 0); - - int ticket_b; - std::string b_message("b"); - EXPECT_GE(ticket_b = absl::debugging_internal::InstallSymbolDecorator( - DummySymbolDecorator, &b_message), - 0); - - int ticket_c; - std::string c_message("c"); - EXPECT_GE(ticket_c = absl::debugging_internal::InstallSymbolDecorator( - DummySymbolDecorator, &c_message), - 0); - - char *address = reinterpret_cast<char *>(1); - EXPECT_STREQ("abc", TrySymbolize(address++)); - - EXPECT_TRUE(absl::debugging_internal::RemoveSymbolDecorator(ticket_b)); - - EXPECT_STREQ("ac", TrySymbolize(address++)); - - // Cleanup: remove all remaining decorators so other stack traces don't - // get mystery "ac" decoration. - EXPECT_TRUE(absl::debugging_internal::RemoveSymbolDecorator(ticket_a)); - EXPECT_TRUE(absl::debugging_internal::RemoveSymbolDecorator(ticket_c)); -} - -// Some versions of Clang with optimizations enabled seem to be able -// to optimize away the .data section if no variables live in the -// section. This variable should get placed in the .data section, and -// the test below checks for the existence of a .data section. -static int in_data_section = 1; - -TEST(Symbolize, ForEachSection) { - int fd = TEMP_FAILURE_RETRY(open("/proc/self/exe", O_RDONLY)); - ASSERT_NE(fd, -1); - - std::vector<std::string> sections; - ASSERT_TRUE(absl::debugging_internal::ForEachSection( - fd, [§ions](const absl::string_view name, const ElfW(Shdr) &) { - sections.emplace_back(name); - return true; - })); - - // Check for the presence of common section names. - EXPECT_THAT(sections, Contains(".text")); - EXPECT_THAT(sections, Contains(".rodata")); - EXPECT_THAT(sections, Contains(".bss")); - ++in_data_section; - EXPECT_THAT(sections, Contains(".data")); - - close(fd); -} -#endif // !ABSL_INTERNAL_HAVE_DARWIN_SYMBOLIZE - -// x86 specific tests. Uses some inline assembler. -extern "C" { -inline void *ABSL_ATTRIBUTE_ALWAYS_INLINE inline_func() { - void *pc = nullptr; -#if defined(__i386__) - __asm__ __volatile__("call 1f;\n 1: pop %[PC]" : [ PC ] "=r"(pc)); -#elif defined(__x86_64__) - __asm__ __volatile__("leaq 0(%%rip),%[PC];\n" : [ PC ] "=r"(pc)); -#endif - return pc; -} - -void *ABSL_ATTRIBUTE_NOINLINE non_inline_func() { - void *pc = nullptr; -#if defined(__i386__) - __asm__ __volatile__("call 1f;\n 1: pop %[PC]" : [ PC ] "=r"(pc)); -#elif defined(__x86_64__) - __asm__ __volatile__("leaq 0(%%rip),%[PC];\n" : [ PC ] "=r"(pc)); -#endif - return pc; -} - -void ABSL_ATTRIBUTE_NOINLINE TestWithPCInsideNonInlineFunction() { -#if defined(ABSL_HAVE_ATTRIBUTE_NOINLINE) && \ - (defined(__i386__) || defined(__x86_64__)) - void *pc = non_inline_func(); - const char *symbol = TrySymbolize(pc); - ABSL_RAW_CHECK(symbol != nullptr, "TestWithPCInsideNonInlineFunction failed"); - ABSL_RAW_CHECK(strcmp(symbol, "non_inline_func") == 0, - "TestWithPCInsideNonInlineFunction failed"); - std::cout << "TestWithPCInsideNonInlineFunction passed" << std::endl; -#endif -} - -void ABSL_ATTRIBUTE_NOINLINE TestWithPCInsideInlineFunction() { -#if defined(ABSL_HAVE_ATTRIBUTE_ALWAYS_INLINE) && \ - (defined(__i386__) || defined(__x86_64__)) - void *pc = inline_func(); // Must be inlined. - const char *symbol = TrySymbolize(pc); - ABSL_RAW_CHECK(symbol != nullptr, "TestWithPCInsideInlineFunction failed"); - ABSL_RAW_CHECK(strcmp(symbol, __FUNCTION__) == 0, - "TestWithPCInsideInlineFunction failed"); - std::cout << "TestWithPCInsideInlineFunction passed" << std::endl; -#endif -} -} - -// Test with a return address. -void ABSL_ATTRIBUTE_NOINLINE TestWithReturnAddress() { -#if defined(ABSL_HAVE_ATTRIBUTE_NOINLINE) - void *return_address = __builtin_return_address(0); - const char *symbol = TrySymbolize(return_address); - ABSL_RAW_CHECK(symbol != nullptr, "TestWithReturnAddress failed"); - ABSL_RAW_CHECK(strcmp(symbol, "main") == 0, "TestWithReturnAddress failed"); - std::cout << "TestWithReturnAddress passed" << std::endl; -#endif -} - -#elif defined(_WIN32) -#if !defined(ABSL_CONSUME_DLL) - -TEST(Symbolize, Basics) { - 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)); - ASSERT_TRUE(static_func_symbol != nullptr); - EXPECT_TRUE(strstr(static_func_symbol, "static_func") != nullptr); - - EXPECT_TRUE(nullptr == TrySymbolize(nullptr)); -} - -TEST(Symbolize, Truncation) { - constexpr char kNonStaticFunc[] = "nonstatic_func"; - EXPECT_STREQ("nonstatic_func", - TrySymbolizeWithLimit((void *)(&nonstatic_func), - strlen(kNonStaticFunc) + 1)); - EXPECT_STREQ("nonstatic_...", - TrySymbolizeWithLimit((void *)(&nonstatic_func), - strlen(kNonStaticFunc) + 0)); - EXPECT_STREQ("nonstatic...", - TrySymbolizeWithLimit((void *)(&nonstatic_func), - strlen(kNonStaticFunc) - 1)); - EXPECT_STREQ("n...", TrySymbolizeWithLimit((void *)(&nonstatic_func), 5)); - EXPECT_STREQ("...", TrySymbolizeWithLimit((void *)(&nonstatic_func), 4)); - EXPECT_STREQ("..", TrySymbolizeWithLimit((void *)(&nonstatic_func), 3)); - EXPECT_STREQ(".", TrySymbolizeWithLimit((void *)(&nonstatic_func), 2)); - EXPECT_STREQ("", TrySymbolizeWithLimit((void *)(&nonstatic_func), 1)); - EXPECT_EQ(nullptr, TrySymbolizeWithLimit((void *)(&nonstatic_func), 0)); -} - -TEST(Symbolize, SymbolizeWithDemangling) { - const char *result = TrySymbolize((void *)(&Foo::func)); - ASSERT_TRUE(result != nullptr); - EXPECT_TRUE(strstr(result, "Foo::func") != nullptr) << result; -} - -#endif // !defined(ABSL_CONSUME_DLL) -#else // Symbolizer unimplemented - -TEST(Symbolize, Unimplemented) { - char buf[64]; - EXPECT_FALSE(absl::Symbolize((void *)(&nonstatic_func), buf, sizeof(buf))); - EXPECT_FALSE(absl::Symbolize((void *)(&static_func), buf, sizeof(buf))); - EXPECT_FALSE(absl::Symbolize((void *)(&Foo::func), buf, sizeof(buf))); -} - -#endif - -int main(int argc, char **argv) { -#if !defined(__EMSCRIPTEN__) - // Make sure kHpageTextPadding is linked into the binary. - if (volatile_bool) { - ABSL_RAW_LOG(INFO, "%s", kHpageTextPadding); - } -#endif // !defined(__EMSCRIPTEN__) - -#if ABSL_PER_THREAD_TLS - // Touch the per-thread variables. - symbolize_test_thread_small[0] = 0; - symbolize_test_thread_big[0] = 0; -#endif - - absl::InitializeSymbolizer(argv[0]); - testing::InitGoogleTest(&argc, argv); - -#if defined(ABSL_INTERNAL_HAVE_ELF_SYMBOLIZE) || \ - defined(ABSL_INTERNAL_HAVE_DARWIN_SYMBOLIZE) - TestWithPCInsideInlineFunction(); - TestWithPCInsideNonInlineFunction(); - TestWithReturnAddress(); -#endif - - return RUN_ALL_TESTS(); -} diff --git a/third_party/abseil_cpp/absl/debugging/symbolize_unimplemented.inc b/third_party/abseil_cpp/absl/debugging/symbolize_unimplemented.inc deleted file mode 100644 index db24456b0afa..000000000000 --- a/third_party/abseil_cpp/absl/debugging/symbolize_unimplemented.inc +++ /dev/null @@ -1,40 +0,0 @@ -// Copyright 2018 The Abseil Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// https://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -#include <cstdint> - -#include "absl/base/internal/raw_logging.h" - -namespace absl { -ABSL_NAMESPACE_BEGIN - -namespace debugging_internal { - -int InstallSymbolDecorator(SymbolDecorator, void*) { return -1; } -bool RemoveSymbolDecorator(int) { return false; } -bool RemoveAllSymbolDecorators(void) { return false; } -bool RegisterFileMappingHint(const void *, const void *, uint64_t, const char *) { - return false; -} -bool GetFileMappingHint(const void **, const void **, uint64_t *, const char **) { - return false; -} - -} // namespace debugging_internal - -void InitializeSymbolizer(const char*) {} -bool Symbolize(const void *, char *, int) { return false; } - -ABSL_NAMESPACE_END -} // namespace absl diff --git a/third_party/abseil_cpp/absl/debugging/symbolize_win32.inc b/third_party/abseil_cpp/absl/debugging/symbolize_win32.inc deleted file mode 100644 index c3df46f606c2..000000000000 --- a/third_party/abseil_cpp/absl/debugging/symbolize_win32.inc +++ /dev/null @@ -1,81 +0,0 @@ -// Copyright 2018 The Abseil Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// https://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -// See "Retrieving Symbol Information by Address": -// https://msdn.microsoft.com/en-us/library/windows/desktop/ms680578(v=vs.85).aspx - -#include <windows.h> - -// MSVC header dbghelp.h has a warning for an ignored typedef. -#pragma warning(push) -#pragma warning(disable:4091) -#include <dbghelp.h> -#pragma warning(pop) - -#pragma comment(lib, "dbghelp.lib") - -#include <algorithm> -#include <cstring> - -#include "absl/base/internal/raw_logging.h" - -namespace absl { -ABSL_NAMESPACE_BEGIN - -static HANDLE process = NULL; - -void InitializeSymbolizer(const char*) { - if (process != nullptr) { - return; - } - process = GetCurrentProcess(); - - // Symbols are not loaded until a reference is made requiring the - // symbols be loaded. This is the fastest, most efficient way to use - // the symbol handler. - SymSetOptions(SYMOPT_DEFERRED_LOADS | SYMOPT_UNDNAME); - if (!SymInitialize(process, nullptr, true)) { - // GetLastError() returns a Win32 DWORD, but we assign to - // unsigned long long to simplify the ABSL_RAW_LOG case below. The uniform - // initialization guarantees this is not a narrowing conversion. - const unsigned long long error{GetLastError()}; // NOLINT(runtime/int) - ABSL_RAW_LOG(FATAL, "SymInitialize() failed: %llu", error); - } -} - -bool Symbolize(const void* pc, char* out, int out_size) { - if (out_size <= 0) { - return false; - } - alignas(SYMBOL_INFO) 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; - if (!SymFromAddr(process, reinterpret_cast<DWORD64>(pc), nullptr, symbol)) { - return false; - } - strncpy(out, symbol->Name, out_size); - if (out[out_size - 1] != '\0') { - // strncpy() does not '\0' terminate when it truncates. - static constexpr char kEllipsis[] = "..."; - int ellipsis_size = - std::min<int>(sizeof(kEllipsis) - 1, out_size - 1); - memcpy(out + out_size - ellipsis_size - 1, kEllipsis, ellipsis_size); - out[out_size - 1] = '\0'; - } - return true; -} - -ABSL_NAMESPACE_END -} // namespace absl |