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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef BASE_DEBUG_STACK_TRACE_H_
#define BASE_DEBUG_STACK_TRACE_H_
#pragma once
#include <iosfwd>
#include "base/base_api.h"
#include "build/build_config.h"
#if defined(OS_WIN)
struct _EXCEPTION_POINTERS;
#endif
namespace base {
namespace debug {
// A stacktrace can be helpful in debugging. For example, you can include a
// stacktrace member in a object (probably around #ifndef NDEBUG) so that you
// can later see where the given object was created from.
class BASE_API StackTrace {
public:
// Creates a stacktrace from the current location.
StackTrace();
#if defined(OS_WIN)
// Creates a stacktrace for an exception.
// Note: this function will throw an import not found (StackWalk64) exception
// on system without dbghelp 5.1.
StackTrace(_EXCEPTION_POINTERS* exception_pointers);
#endif
// Copying and assignment are allowed with the default functions.
~StackTrace();
// Gets an array of instruction pointer values. |*count| will be set to the
// number of elements in the returned array.
const void* const* Addresses(size_t* count) const;
// Prints a backtrace to stderr
void PrintBacktrace() const;
// Resolves backtrace to symbols and write to stream.
void OutputToStream(std::ostream* os) const;
private:
// From http://msdn.microsoft.com/en-us/library/bb204633.aspx,
// the sum of FramesToSkip and FramesToCapture must be less than 63,
// so set it to 62. Even if on POSIX it could be a larger value, it usually
// doesn't give much more information.
static const int kMaxTraces = 62;
void* trace_[kMaxTraces];
int count_;
};
} // namespace debug
} // namespace base
#endif // BASE_DEBUG_STACK_TRACE_H_
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