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/*
* Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
* Copyright (C) 2003, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
* Copyright (C) 2007 Cameron Zwarich (cwzwarich@uwaterloo.ca)
* Copyright (C) 2007 Maks Orlovich
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#ifndef Arguments_h
#define Arguments_h
#include "JSActivation.h"
#include "JSFunction.h"
#include "JSGlobalObject.h"
#include "Interpreter.h"
#include "ObjectConstructor.h"
#include "PrototypeFunction.h"
namespace JSC {
struct ArgumentsData : Noncopyable {
JSActivation* activation;
unsigned numParameters;
ptrdiff_t firstParameterIndex;
unsigned numArguments;
Register* registers;
OwnArrayPtr<Register> registerArray;
Register* extraArguments;
OwnArrayPtr<bool> deletedArguments;
Register extraArgumentsFixedBuffer[4];
JSFunction* callee;
bool overrodeLength : 1;
bool overrodeCallee : 1;
};
class Arguments : public JSObject {
public:
// Use an enum because otherwise gcc insists on doing a memory
// read.
enum { MaxArguments = 0x10000 };
enum NoParametersType { NoParameters };
Arguments(CallFrame*);
Arguments(CallFrame*, NoParametersType);
virtual ~Arguments();
static const ClassInfo info;
virtual void markChildren(MarkStack&);
void fillArgList(ExecState*, MarkedArgumentBuffer&);
uint32_t numProvidedArguments(ExecState* exec) const
{
if (UNLIKELY(d->overrodeLength))
return get(exec, exec->propertyNames().length).toUInt32(exec);
return d->numArguments;
}
void copyToRegisters(ExecState* exec, Register* buffer, uint32_t maxSize);
void copyRegisters();
bool isTornOff() const { return d->registerArray; }
void setActivation(JSActivation* activation)
{
d->activation = activation;
d->registers = &activation->registerAt(0);
}
static PassRefPtr<Structure> createStructure(JSValue prototype)
{
return Structure::create(prototype, TypeInfo(ObjectType, StructureFlags), AnonymousSlotCount);
}
protected:
static const unsigned StructureFlags = OverridesGetOwnPropertySlot | OverridesMarkChildren | OverridesGetPropertyNames | JSObject::StructureFlags;
private:
void getArgumentsData(CallFrame*, JSFunction*&, ptrdiff_t& firstParameterIndex, Register*& argv, int& argc);
virtual bool getOwnPropertySlot(ExecState*, const Identifier& propertyName, PropertySlot&);
virtual bool getOwnPropertySlot(ExecState*, unsigned propertyName, PropertySlot&);
virtual bool getOwnPropertyDescriptor(ExecState*, const Identifier&, PropertyDescriptor&);
virtual void getOwnPropertyNames(ExecState*, PropertyNameArray&, EnumerationMode mode = ExcludeDontEnumProperties);
virtual void put(ExecState*, const Identifier& propertyName, JSValue, PutPropertySlot&);
virtual void put(ExecState*, unsigned propertyName, JSValue, PutPropertySlot&);
virtual bool deleteProperty(ExecState*, const Identifier& propertyName);
virtual bool deleteProperty(ExecState*, unsigned propertyName);
virtual const ClassInfo* classInfo() const { return &info; }
void init(CallFrame*);
OwnPtr<ArgumentsData> d;
};
Arguments* asArguments(JSValue);
inline Arguments* asArguments(JSValue value)
{
ASSERT(asObject(value)->inherits(&Arguments::info));
return static_cast<Arguments*>(asObject(value));
}
ALWAYS_INLINE void Arguments::getArgumentsData(CallFrame* callFrame, JSFunction*& function, ptrdiff_t& firstParameterIndex, Register*& argv, int& argc)
{
function = asFunction(callFrame->callee());
int numParameters = function->jsExecutable()->parameterCount();
argc = callFrame->argumentCountIncludingThis();
if (argc <= numParameters)
argv = callFrame->registers() - RegisterFile::CallFrameHeaderSize - numParameters;
else
argv = callFrame->registers() - RegisterFile::CallFrameHeaderSize - numParameters - argc;
argc -= 1; // - 1 to skip "this"
firstParameterIndex = -RegisterFile::CallFrameHeaderSize - numParameters;
}
inline Arguments::Arguments(CallFrame* callFrame)
: JSObject(callFrame->lexicalGlobalObject()->argumentsStructure())
, d(new ArgumentsData)
{
JSFunction* callee;
ptrdiff_t firstParameterIndex;
Register* argv;
int numArguments;
getArgumentsData(callFrame, callee, firstParameterIndex, argv, numArguments);
d->numParameters = callee->jsExecutable()->parameterCount();
d->firstParameterIndex = firstParameterIndex;
d->numArguments = numArguments;
d->activation = 0;
d->registers = callFrame->registers();
Register* extraArguments;
if (d->numArguments <= d->numParameters)
extraArguments = 0;
else {
unsigned numExtraArguments = d->numArguments - d->numParameters;
if (numExtraArguments > sizeof(d->extraArgumentsFixedBuffer) / sizeof(Register))
extraArguments = new Register[numExtraArguments];
else
extraArguments = d->extraArgumentsFixedBuffer;
for (unsigned i = 0; i < numExtraArguments; ++i)
extraArguments[i] = argv[d->numParameters + i];
}
d->extraArguments = extraArguments;
d->callee = callee;
d->overrodeLength = false;
d->overrodeCallee = false;
}
inline Arguments::Arguments(CallFrame* callFrame, NoParametersType)
: JSObject(callFrame->lexicalGlobalObject()->argumentsStructure())
, d(new ArgumentsData)
{
ASSERT(!asFunction(callFrame->callee())->jsExecutable()->parameterCount());
unsigned numArguments = callFrame->argumentCount();
d->numParameters = 0;
d->numArguments = numArguments;
d->activation = 0;
Register* extraArguments;
if (numArguments > sizeof(d->extraArgumentsFixedBuffer) / sizeof(Register))
extraArguments = new Register[numArguments];
else
extraArguments = d->extraArgumentsFixedBuffer;
Register* argv = callFrame->registers() - RegisterFile::CallFrameHeaderSize - numArguments - 1;
for (unsigned i = 0; i < numArguments; ++i)
extraArguments[i] = argv[i];
d->extraArguments = extraArguments;
d->callee = asFunction(callFrame->callee());
d->overrodeLength = false;
d->overrodeCallee = false;
}
inline void Arguments::copyRegisters()
{
ASSERT(!isTornOff());
if (!d->numParameters)
return;
int registerOffset = d->numParameters + RegisterFile::CallFrameHeaderSize;
size_t registerArraySize = d->numParameters;
Register* registerArray = new Register[registerArraySize];
memcpy(registerArray, d->registers - registerOffset, registerArraySize * sizeof(Register));
d->registerArray.set(registerArray);
d->registers = registerArray + registerOffset;
}
// This JSActivation function is defined here so it can get at Arguments::setRegisters.
inline void JSActivation::copyRegisters()
{
ASSERT(!d()->registerArray);
size_t numParametersMinusThis = d()->functionExecutable->parameterCount();
size_t numVars = d()->functionExecutable->variableCount();
size_t numLocals = numVars + numParametersMinusThis;
if (!numLocals)
return;
int registerOffset = numParametersMinusThis + RegisterFile::CallFrameHeaderSize;
size_t registerArraySize = numLocals + RegisterFile::CallFrameHeaderSize;
Register* registerArray = copyRegisterArray(d()->registers - registerOffset, registerArraySize);
setRegisters(registerArray + registerOffset, registerArray);
}
} // namespace JSC
#endif // Arguments_h
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