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/*
* Copyright (C) 2008 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.
*/
#include "config.h"
#include "CallFrame.h"
#include "CodeBlock.h"
#include "Interpreter.h"
namespace JSC {
#ifndef NDEBUG
void CallFrame::dumpCaller()
{
int signedLineNumber;
intptr_t sourceID;
UString urlString;
JSValue function;
interpreter()->retrieveLastCaller(this, signedLineNumber, sourceID, urlString, function);
dataLog("Callpoint => %s:%d\n", urlString.utf8().data(), signedLineNumber);
}
RegisterFile* CallFrame::registerFile()
{
return &interpreter()->registerFile();
}
#endif
#if USE(JSVALUE32_64)
unsigned CallFrame::bytecodeOffsetForNonDFGCode() const
{
ASSERT(codeBlock());
return currentVPC() - codeBlock()->instructions().begin();
}
void CallFrame::setBytecodeOffsetForNonDFGCode(unsigned offset)
{
ASSERT(codeBlock());
setCurrentVPC(codeBlock()->instructions().begin() + offset);
}
#else
Instruction* CallFrame::currentVPC() const
{
return codeBlock()->instructions().begin() + bytecodeOffsetForNonDFGCode();
}
void CallFrame::setCurrentVPC(Instruction* vpc)
{
setBytecodeOffsetForNonDFGCode(vpc - codeBlock()->instructions().begin());
}
#endif
#if ENABLE(DFG_JIT)
bool CallFrame::isInlineCallFrameSlow()
{
if (!callee())
return false;
JSCell* calleeAsFunctionCell = getJSFunction(callee());
if (!calleeAsFunctionCell)
return false;
JSFunction* calleeAsFunction = jsCast<JSFunction*>(calleeAsFunctionCell);
return calleeAsFunction->executable() != codeBlock()->ownerExecutable();
}
CallFrame* CallFrame::trueCallFrame(AbstractPC pc)
{
// Am I an inline call frame? If so, we're done.
if (isInlineCallFrame())
return this;
// If I don't have a code block, then I'm not DFG code, so I'm the true call frame.
CodeBlock* machineCodeBlock = codeBlock();
if (!machineCodeBlock)
return this;
// If the code block does not have any code origins, then there was no inlining, so
// I'm done.
if (!machineCodeBlock->hasCodeOrigins())
return this;
// At this point the PC must be due either to the DFG, or it must be unset.
ASSERT(pc.hasJITReturnAddress() || !pc);
// Try to determine the CodeOrigin. If we don't have a pc set then the only way
// that this makes sense is if the CodeOrigin index was set in the call frame.
// FIXME: Note that you will see "Not currently in inlined code" comments below.
// Currently, we do not record code origins for code that is not inlined, because
// the only thing that we use code origins for is determining the inline stack.
// But in the future, we'll want to use this same functionality (having a code
// origin mapping for any calls out of JIT code) to determine the PC at any point
// in the stack even if not in inlined code. When that happens, the code below
// will have to change the way it detects the presence of inlining: it will always
// get a code origin, but sometimes, that code origin will not have an inline call
// frame. In that case, this method should bail and return this.
CodeOrigin codeOrigin;
if (pc.isSet()) {
ReturnAddressPtr currentReturnPC = pc.jitReturnAddress();
bool hasCodeOrigin = machineCodeBlock->codeOriginForReturn(currentReturnPC, codeOrigin);
ASSERT_UNUSED(hasCodeOrigin, hasCodeOrigin);
} else {
unsigned index = codeOriginIndexForDFG();
codeOrigin = machineCodeBlock->codeOrigin(index);
}
if (!codeOrigin.inlineCallFrame)
return this; // Not currently in inlined code.
for (InlineCallFrame* inlineCallFrame = codeOrigin.inlineCallFrame; inlineCallFrame;) {
InlineCallFrame* nextInlineCallFrame = inlineCallFrame->caller.inlineCallFrame;
CallFrame* inlinedCaller = this + inlineCallFrame->stackOffset;
JSFunction* calleeAsFunction = inlineCallFrame->callee.get();
// Fill in the inlinedCaller
inlinedCaller->setCodeBlock(machineCodeBlock);
inlinedCaller->setScopeChain(calleeAsFunction->scope());
if (nextInlineCallFrame)
inlinedCaller->setCallerFrame(this + nextInlineCallFrame->stackOffset);
else
inlinedCaller->setCallerFrame(this);
inlinedCaller->setInlineCallFrame(inlineCallFrame);
inlinedCaller->setArgumentCountIncludingThis(inlineCallFrame->arguments.size());
inlinedCaller->setCallee(calleeAsFunction);
inlineCallFrame = nextInlineCallFrame;
}
return this + codeOrigin.inlineCallFrame->stackOffset;
}
CallFrame* CallFrame::trueCallerFrame()
{
// this -> The callee; this is either an inlined callee in which case it already has
// a pointer to the true caller. Otherwise it contains current PC in the machine
// caller.
//
// machineCaller -> The caller according to the machine, which may be zero or
// more frames above the true caller due to inlining.
// Am I an inline call frame? If so, we're done.
if (isInlineCallFrame())
return callerFrame()->removeHostCallFrameFlag();
// I am a machine call frame, so the question is: is my caller a machine call frame
// that has inlines or a machine call frame that doesn't?
CallFrame* machineCaller = callerFrame()->removeHostCallFrameFlag();
if (!machineCaller)
return 0;
ASSERT(!machineCaller->isInlineCallFrame());
// Figure out how we want to get the current code location.
if (!hasReturnPC() || returnAddressIsInCtiTrampoline(returnPC()))
return machineCaller->trueCallFrameFromVMCode()->removeHostCallFrameFlag();
return machineCaller->trueCallFrame(returnPC())->removeHostCallFrameFlag();
}
CodeBlock* CallFrame::someCodeBlockForPossiblyInlinedCode()
{
if (!isInlineCallFrame())
return codeBlock();
return jsCast<FunctionExecutable*>(inlineCallFrame()->executable.get())->baselineCodeBlockFor(
inlineCallFrame()->isCall ? CodeForCall : CodeForConstruct);
}
#endif
Register* CallFrame::frameExtentInternal()
{
CodeBlock* codeBlock = this->codeBlock();
ASSERT(codeBlock);
return registers() + codeBlock->m_numCalleeRegisters;
}
}
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