// Copyright (c) 2005 - 2007, Google Inc.
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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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//
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// Author: Arun Sharma
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//
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// Produce stack trace using libgcc
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#include <unwind.h> // ABI defined unwinder
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#include <cstdlib> // for nullptr
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#include "stacktrace.h"
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_START_GOOGLE_NAMESPACE_
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struct trace_arg_t {
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void **result;
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int max_depth;
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int skip_count;
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int count;
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};
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// Workaround for the malloc() in _Unwind_Backtrace() issue.
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static _Unwind_Reason_Code nop_backtrace(struct _Unwind_Context */*uc*/, void */*opq*/) {
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return _URC_NO_REASON;
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}
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// This code is not considered ready to run until
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// static initializers run so that we are guaranteed
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// that any malloc-related initialization is done.
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static bool ready_to_run = false;
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class StackTraceInit {
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public:
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StackTraceInit() {
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// Extra call to force initialization
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_Unwind_Backtrace(nop_backtrace, nullptr);
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ready_to_run = true;
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}
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};
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static StackTraceInit module_initializer; // Force initialization
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static _Unwind_Reason_Code GetOneFrame(struct _Unwind_Context *uc, void *opq) {
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auto *targ = static_cast<trace_arg_t *>(opq);
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if (targ->skip_count > 0) {
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targ->skip_count--;
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} else {
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targ->result[targ->count++] = reinterpret_cast<void *>(_Unwind_GetIP(uc));
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}
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if (targ->count == targ->max_depth) {
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return _URC_END_OF_STACK;
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}
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return _URC_NO_REASON;
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}
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// If you change this function, also change GetStackFrames below.
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int GetStackTrace(void** result, int max_depth, int skip_count) {
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if (!ready_to_run) {
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return 0;
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}
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trace_arg_t targ;
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skip_count += 1; // Do not include the "GetStackTrace" frame
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targ.result = result;
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targ.max_depth = max_depth;
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targ.skip_count = skip_count;
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targ.count = 0;
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_Unwind_Backtrace(GetOneFrame, &targ);
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return targ.count;
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}
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_END_GOOGLE_NAMESPACE_
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