133 lines
4.9 KiB
C++
133 lines
4.9 KiB
C++
// 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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// http://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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// Produce stack trace.
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//
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// There are three different ways we can try to get the stack trace:
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//
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// 1) Our hand-coded stack-unwinder. This depends on a certain stack
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// layout, which is used by gcc (and those systems using a
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// gcc-compatible ABI) on x86 systems, at least since gcc 2.95.
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// It uses the frame pointer to do its work.
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//
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// 2) The libunwind library. This is still in development, and as a
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// separate library adds a new dependency, but doesn't need a frame
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// pointer. It also doesn't call malloc.
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//
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// 3) The gdb unwinder -- also the one used by the c++ exception code.
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// It's obviously well-tested, but has a fatal flaw: it can call
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// malloc() from the unwinder. This is a problem because we're
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// trying to use the unwinder to instrument malloc().
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//
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// Note: if you add a new implementation here, make sure it works
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// correctly when absl::GetStackTrace() is called with max_depth == 0.
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// Some code may do that.
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#include "absl/debugging/stacktrace.h"
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#include <atomic>
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#include "absl/base/port.h"
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#include "absl/debugging/internal/stacktrace_config.h"
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#if defined(ABSL_STACKTRACE_INL_HEADER)
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#include ABSL_STACKTRACE_INL_HEADER
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#else
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# error Cannot calculate stack trace: will need to write for your environment
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# include "absl/debugging/internal/stacktrace_x86-inl.inc"
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# include "absl/debugging/internal/stacktrace_win32-inl.inc"
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# include "absl/debugging/internal/stacktrace_unimplemented-inl.inc"
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# include "absl/debugging/internal/stacktrace_libunwind-inl.inc"
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# include "absl/debugging/internal/stacktrace_generic-inl.inc"
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# include "absl/debugging/internal/stacktrace_powerpc-inl.inc"
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# include "absl/debugging/internal/stacktrace_arm-inl.inc"
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# include "absl/debugging/internal/stacktrace_aarch64-inl.inc"
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#endif
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namespace absl {
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namespace {
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typedef int (*Unwinder)(void**, int*, int, int, const void*, int*);
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std::atomic<Unwinder> custom;
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template <bool IS_STACK_FRAMES, bool IS_WITH_CONTEXT>
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ABSL_ATTRIBUTE_ALWAYS_INLINE inline int Unwind(void** result, int* sizes,
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int max_depth, int skip_count,
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const void* uc,
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int* min_dropped_frames) {
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Unwinder f = &UnwindImpl<IS_STACK_FRAMES, IS_WITH_CONTEXT>;
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Unwinder g = custom.load(std::memory_order_acquire);
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if (g != nullptr) f = g;
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// Add 1 to skip count for the unwinder function itself
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int size = (*f)(result, sizes, max_depth, skip_count + 1, uc,
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min_dropped_frames);
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// To disable tail call to (*f)(...)
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ABSL_BLOCK_TAIL_CALL_OPTIMIZATION();
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return size;
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}
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} // anonymous namespace
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int GetStackFrames(void** result, int* sizes, int max_depth, int skip_count) {
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return Unwind<true, false>(result, sizes, max_depth, skip_count, nullptr,
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nullptr);
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}
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int GetStackFramesWithContext(void** result, int* sizes, int max_depth,
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int skip_count, const void* uc,
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int* min_dropped_frames) {
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return Unwind<true, true>(result, sizes, max_depth, skip_count, uc,
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min_dropped_frames);
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}
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int GetStackTrace(void** result, int max_depth, int skip_count) {
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return Unwind<false, false>(result, nullptr, max_depth, skip_count, nullptr,
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nullptr);
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}
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int GetStackTraceWithContext(void** result, int max_depth, int skip_count,
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const void* uc, int* min_dropped_frames) {
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return Unwind<false, true>(result, nullptr, max_depth, skip_count, uc,
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min_dropped_frames);
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}
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void SetStackUnwinder(Unwinder w) {
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custom.store(w, std::memory_order_release);
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}
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int DefaultStackUnwinder(void** pcs, int* sizes, int depth, int skip,
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const void* uc, int* min_dropped_frames) {
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skip++; // For this function
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Unwinder f = nullptr;
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if (sizes == nullptr) {
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if (uc == nullptr) {
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f = &UnwindImpl<false, false>;
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} else {
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f = &UnwindImpl<false, true>;
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}
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} else {
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if (uc == nullptr) {
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f = &UnwindImpl<true, false>;
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} else {
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f = &UnwindImpl<true, true>;
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}
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}
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volatile int x = 0;
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int n = (*f)(pcs, sizes, depth, skip, uc, min_dropped_frames);
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x = 1; (void) x; // To disable tail call to (*f)(...)
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return n;
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}
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} // namespace absl
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