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/*
* Copyright (C) 2017 Apple Inc. All rights reserved.
* Copyright (C) 2017 Yusuke Suzuki <utatane.tea@gmail.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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.
*/
#pragma once
#include <optional>
#include <wtf/SystemFree.h>
namespace WTF {
class PrintStream;
class StackTrace {
WTF_MAKE_FAST_ALLOCATED;
public:
WTF_EXPORT_PRIVATE static std::unique_ptr<StackTrace> captureStackTrace(int maxFrames, int framesToSkip = 0);
// Borrowed stack trace.
StackTrace(void** stack, int size, const char* prefix = "")
: m_prefix(prefix)
, m_size(size)
, m_capacity(0)
, m_borrowedStack(stack)
{ }
int size() const { return m_size; }
void* const * stack() const
{
if (!m_capacity)
return m_borrowedStack;
return m_stack;
}
class DemangleEntry {
WTF_MAKE_FAST_ALLOCATED;
public:
friend class StackTrace;
const char* mangledName() const { return m_mangledName; }
const char* demangledName() const { return m_demangledName.get(); }
private:
DemangleEntry(const char* mangledName, const char* demangledName)
: m_mangledName(mangledName)
, m_demangledName(demangledName)
{ }
const char* m_mangledName { nullptr };
std::unique_ptr<const char[], SystemFree<const char[]>> m_demangledName;
};
WTF_EXPORT_PRIVATE static std::optional<DemangleEntry> demangle(void*);
WTF_EXPORT_PRIVATE void dump(PrintStream&, const char* indentString = nullptr) const;
private:
inline static size_t instanceSize(int capacity);
StackTrace()
: m_size(0)
{ }
const char* m_prefix { nullptr };
// We structure the top fields this way because the underlying stack capture
// facility will capture from the top of the stack, and we'll need to skip the
// top 2 frame which is of no interest. Setting up the fields layout this way
// allows us to capture the stack in place and minimize space wastage.
union {
struct {
int m_size;
int m_capacity;
};
struct {
void* m_skippedFrame0;
void* m_skippedFrame1;
};
};
union {
void** m_borrowedStack;
void* m_stack[1];
};
};
} // namespace WTF
using WTF::StackTrace;
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