diff options
Diffstat (limited to 'third_party/abseil_cpp/absl/debugging/stacktrace.cc')
| -rw-r--r-- | third_party/abseil_cpp/absl/debugging/stacktrace.cc | 140 |
1 files changed, 0 insertions, 140 deletions
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 1f7c7d82b2..0000000000 --- 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 |