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/*
* Copyright (C) 2013, 2015 Apple Inc. All rights reserved.
*
* 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.
*/
#ifndef StackVisitor_h
#define StackVisitor_h
#include "VMEntryRecord.h"
#include <wtf/text/WTFString.h>
namespace JSC {
struct CodeOrigin;
struct InlineCallFrame;
class CodeBlock;
class ExecState;
class JSFunction;
class JSObject;
class JSScope;
class ClonedArguments;
class Register;
typedef ExecState CallFrame;
class StackVisitor {
public:
class Frame {
public:
enum CodeType {
Global,
Eval,
Function,
Module,
Native
};
size_t index() const { return m_index; }
size_t argumentCountIncludingThis() const { return m_argumentCountIncludingThis; }
bool callerIsVMEntryFrame() const { return m_callerIsVMEntryFrame; }
CallFrame* callerFrame() const { return m_callerFrame; }
JSObject* callee() const { return m_callee; }
CodeBlock* codeBlock() const { return m_codeBlock; }
unsigned bytecodeOffset() const { return m_bytecodeOffset; }
#if ENABLE(DFG_JIT)
InlineCallFrame* inlineCallFrame() const { return m_inlineCallFrame; }
#endif
bool isJSFrame() const { return !!codeBlock(); }
#if ENABLE(DFG_JIT)
bool isInlinedFrame() const { return !!m_inlineCallFrame; }
#endif
JS_EXPORT_PRIVATE String functionName();
JS_EXPORT_PRIVATE String sourceURL();
JS_EXPORT_PRIVATE String toString();
CodeType codeType() const;
JS_EXPORT_PRIVATE void computeLineAndColumn(unsigned& line, unsigned& column);
ClonedArguments* createArguments();
VMEntryFrame* vmEntryFrame() const { return m_VMEntryFrame; }
CallFrame* callFrame() const { return m_callFrame; }
JS_EXPORT_PRIVATE void print(int indentLevel);
private:
Frame() { }
~Frame() { }
void retrieveExpressionInfo(int& divot, int& startOffset, int& endOffset, unsigned& line, unsigned& column);
void setToEnd();
size_t m_index;
size_t m_argumentCountIncludingThis;
VMEntryFrame* m_VMEntryFrame;
VMEntryFrame* m_CallerVMEntryFrame;
CallFrame* m_callerFrame;
JSObject* m_callee;
CodeBlock* m_codeBlock;
unsigned m_bytecodeOffset;
bool m_callerIsVMEntryFrame;
#if ENABLE(DFG_JIT)
InlineCallFrame* m_inlineCallFrame;
#endif
CallFrame* m_callFrame;
friend class StackVisitor;
};
enum Status {
Continue = 0,
Done = 1
};
// StackVisitor::visit() expects a Functor that implements the following method:
// Status operator()(StackVisitor&);
template <typename Functor>
static void visit(CallFrame* startFrame, Functor& functor)
{
StackVisitor visitor(startFrame);
while (visitor->callFrame()) {
Status status = functor(visitor);
if (status != Continue)
break;
visitor.gotoNextFrame();
}
}
Frame& operator*() { return m_frame; }
ALWAYS_INLINE Frame* operator->() { return &m_frame; }
void unwindToMachineCodeBlockFrame();
private:
JS_EXPORT_PRIVATE StackVisitor(CallFrame* startFrame);
JS_EXPORT_PRIVATE void gotoNextFrame();
void readFrame(CallFrame*);
void readNonInlinedFrame(CallFrame*, CodeOrigin* = 0);
#if ENABLE(DFG_JIT)
void readInlinedFrame(CallFrame*, CodeOrigin*);
#endif
Frame m_frame;
};
class CallerFunctor {
public:
CallerFunctor()
: m_hasSkippedFirstFrame(false)
, m_callerFrame(0)
{
}
CallFrame* callerFrame() const { return m_callerFrame; }
StackVisitor::Status operator()(StackVisitor& visitor)
{
if (!m_hasSkippedFirstFrame) {
m_hasSkippedFirstFrame = true;
return StackVisitor::Continue;
}
m_callerFrame = visitor->callFrame();
return StackVisitor::Done;
}
private:
bool m_hasSkippedFirstFrame;
CallFrame* m_callerFrame;
};
} // namespace JSC
#endif // StackVisitor_h
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