Abseil Common Libraries (C++) (grcp 依赖)
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93 lines
3.7 KiB
93 lines
3.7 KiB
// Copyright 2017 The Abseil Authors. |
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// |
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// Licensed under the Apache License, Version 2.0 (the "License"); |
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// you may not use this file except in compliance with the License. |
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// You may obtain a copy of the License at |
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// |
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// https://www.apache.org/licenses/LICENSE-2.0 |
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// |
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// Unless required by applicable law or agreed to in writing, software |
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// distributed under the License is distributed on an "AS IS" BASIS, |
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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// See the License for the specific language governing permissions and |
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// limitations under the License. |
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// |
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// Produces a stack trace for Windows. Normally, one could use |
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// stacktrace_x86-inl.h or stacktrace_x86_64-inl.h -- and indeed, that |
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// should work for binaries compiled using MSVC in "debug" mode. |
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// However, in "release" mode, Windows uses frame-pointer |
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// optimization, which makes getting a stack trace very difficult. |
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// |
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// There are several approaches one can take. One is to use Windows |
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// intrinsics like StackWalk64. These can work, but have restrictions |
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// on how successful they can be. Another attempt is to write a |
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// version of stacktrace_x86-inl.h that has heuristic support for |
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// dealing with FPO, similar to what WinDbg does (see |
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// http://www.nynaeve.net/?p=97). There are (non-working) examples of |
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// these approaches, complete with TODOs, in stacktrace_win32-inl.h#1 |
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// |
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// The solution we've ended up doing is to call the undocumented |
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// windows function RtlCaptureStackBackTrace, which probably doesn't |
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// work with FPO but at least is fast, and doesn't require a symbol |
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// server. |
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// |
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// This code is inspired by a patch from David Vitek: |
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// https://code.google.com/p/google-perftools/issues/detail?id=83 |
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#ifndef ABSL_DEBUGGING_INTERNAL_STACKTRACE_WIN32_INL_H_ |
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#define ABSL_DEBUGGING_INTERNAL_STACKTRACE_WIN32_INL_H_ |
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#include <windows.h> // for GetProcAddress and GetModuleHandle |
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#include <cassert> |
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typedef USHORT NTAPI RtlCaptureStackBackTrace_Function( |
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IN ULONG frames_to_skip, |
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IN ULONG frames_to_capture, |
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OUT PVOID *backtrace, |
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OUT PULONG backtrace_hash); |
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// It is not possible to load RtlCaptureStackBackTrace at static init time in |
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// UWP. CaptureStackBackTrace is the public version of RtlCaptureStackBackTrace |
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#if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_APP) && \ |
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!WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP) |
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static RtlCaptureStackBackTrace_Function* const RtlCaptureStackBackTrace_fn = |
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&::CaptureStackBackTrace; |
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#else |
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// Load the function we need at static init time, where we don't have |
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// to worry about someone else holding the loader's lock. |
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static RtlCaptureStackBackTrace_Function* const RtlCaptureStackBackTrace_fn = |
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(RtlCaptureStackBackTrace_Function*)GetProcAddress( |
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GetModuleHandleA("ntdll.dll"), "RtlCaptureStackBackTrace"); |
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#endif // WINAPI_PARTITION_APP && !WINAPI_PARTITION_DESKTOP |
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template <bool IS_STACK_FRAMES, bool IS_WITH_CONTEXT> |
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static int UnwindImpl(void** result, int* sizes, int max_depth, int skip_count, |
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const void*, int* min_dropped_frames) { |
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int n = 0; |
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if (!RtlCaptureStackBackTrace_fn) { |
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// can't find a stacktrace with no function to call |
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} else { |
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n = (int)RtlCaptureStackBackTrace_fn(skip_count + 2, max_depth, result, 0); |
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} |
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if (IS_STACK_FRAMES) { |
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// No implementation for finding out the stack frame sizes yet. |
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memset(sizes, 0, sizeof(*sizes) * n); |
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} |
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if (min_dropped_frames != nullptr) { |
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// Not implemented. |
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*min_dropped_frames = 0; |
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} |
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return n; |
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} |
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namespace absl { |
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ABSL_NAMESPACE_BEGIN |
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namespace debugging_internal { |
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bool StackTraceWorksForTest() { |
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return false; |
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} |
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} // namespace debugging_internal |
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ABSL_NAMESPACE_END |
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} // namespace absl |
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#endif // ABSL_DEBUGGING_INTERNAL_STACKTRACE_WIN32_INL_H_
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