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// Copyright (c) 2012 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.
// Slightly adapted for inclusion in V8.
// Copyright 2016 the V8 project authors. All rights reserved.
#ifndef V8_BASE_DEBUG_STACK_TRACE_H_
#define V8_BASE_DEBUG_STACK_TRACE_H_
#include <stddef.h>
#include <iosfwd>
#include <string>
#include "src/base/base-export.h"
#include "src/base/build_config.h"
#if V8_OS_POSIX
#include <unistd.h>
#endif
#if V8_OS_WIN
struct _EXCEPTION_POINTERS;
struct _CONTEXT;
#endif
namespace v8 {
namespace base {
namespace debug {
// Enables stack dump to console output on exception and signals.
// When enabled, the process will quit immediately. This is meant to be used in
// tests only!
V8_BASE_EXPORT bool EnableInProcessStackDumping();
V8_BASE_EXPORT void DisableSignalStackDump();
// 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 V8_BASE_EXPORT StackTrace {
public:
// Creates a stacktrace from the current location.
StackTrace();
// Creates a stacktrace from an existing array of instruction
// pointers (such as returned by Addresses()). |count| will be
// trimmed to |kMaxTraces|.
StackTrace(const void* const* trace, size_t count);
#if V8_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.
explicit StackTrace(_EXCEPTION_POINTERS* exception_pointers);
explicit StackTrace(const _CONTEXT* context);
#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 the stack trace to stderr.
void Print() const;
// Resolves backtrace to symbols and write to stream.
void OutputToStream(std::ostream* os) const;
// Resolves backtrace to symbols and returns as string.
std::string ToString() const;
private:
#if V8_OS_WIN
void InitTrace(const _CONTEXT* context_record);
#endif
// 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];
// The number of valid frames in |trace_|.
size_t count_;
};
} // namespace debug
} // namespace base
} // namespace v8
#endif // V8_BASE_DEBUG_STACK_TRACE_H_
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