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