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112 lines
3.9 KiB
C++
112 lines
3.9 KiB
C++
// -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*-
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// Copyright (c) 2016, gperftools Contributors
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// This file implements backtrace capturing via libgcc's
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// _Unwind_Backtrace. This generally works almost always. It will fail
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// sometimes when we're trying to capture backtrace from signal
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// handler (i.e. in cpu profiler) while some C++ code is throwing
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// exception.
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#ifndef BASE_STACKTRACE_LIBGCC_INL_H_
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#define BASE_STACKTRACE_LIBGCC_INL_H_
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// Note: this file is included into stacktrace.cc more than once.
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// Anything that should only be defined once should be here:
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extern "C" {
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#include <assert.h>
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#include <string.h> // for memset()
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}
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#include <unwind.h>
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#include "gperftools/stacktrace.h"
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struct libgcc_backtrace_data {
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void **array;
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int skip;
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int pos;
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int limit;
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};
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static _Unwind_Reason_Code libgcc_backtrace_helper(struct _Unwind_Context *ctx,
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void *_data) {
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libgcc_backtrace_data *data =
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reinterpret_cast<libgcc_backtrace_data *>(_data);
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if (data->skip > 0) {
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data->skip--;
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return _URC_NO_REASON;
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}
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if (data->pos < data->limit) {
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void *ip = reinterpret_cast<void *>(_Unwind_GetIP(ctx));;
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data->array[data->pos++] = ip;
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}
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return _URC_NO_REASON;
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}
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#endif // BASE_STACKTRACE_LIBGCC_INL_H_
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// Note: this part of the file is included several times.
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// Do not put globals below.
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// The following 4 functions are generated from the code below:
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// GetStack{Trace,Frames}()
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// GetStack{Trace,Frames}WithContext()
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//
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// These functions take the following args:
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// void** result: the stack-trace, as an array
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// int* sizes: the size of each stack frame, as an array
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// (GetStackFrames* only)
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// int max_depth: the size of the result (and sizes) array(s)
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// int skip_count: how many stack pointers to skip before storing in result
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// void* ucp: a ucontext_t* (GetStack{Trace,Frames}WithContext only)
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static int GET_STACK_TRACE_OR_FRAMES {
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libgcc_backtrace_data data;
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data.array = result;
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// we're also skipping current and parent's frame
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data.skip = skip_count + 2;
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data.pos = 0;
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data.limit = max_depth;
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_Unwind_Backtrace(libgcc_backtrace_helper, &data);
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if (data.pos > 1 && data.array[data.pos - 1] == NULL)
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--data.pos;
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#if IS_STACK_FRAMES
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// No implementation for finding out the stack frame sizes.
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memset(sizes, 0, sizeof(*sizes) * data.pos);
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#endif
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return data.pos;
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}
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