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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 "CodeOrigin.h"
#include "JSActivation.h"
#include "JSFunction.h"
#include "JSGlobalObject.h"
#include "Interpreter.h"
#include "ObjectConstructor.h"
namespace JSC {
struct ArgumentsData {
WTF_MAKE_NONCOPYABLE(ArgumentsData); WTF_MAKE_FAST_ALLOCATED;
public:
ArgumentsData() { }
WriteBarrier<JSActivation> activation;
unsigned numArguments;
// We make these full byte booleans to make them easy to test from the JIT,
// and because even if they were single-bit booleans we still wouldn't save
// any space.
bool overrodeLength;
bool overrodeCallee;
bool overrodeCaller;
bool isStrictMode;
WriteBarrier<Unknown>* registers;
OwnArrayPtr<WriteBarrier<Unknown> > registerArray;
OwnArrayPtr<bool> deletedArguments;
WriteBarrier<JSFunction> callee;
};
class Arguments : public JSNonFinalObject {
public:
typedef JSNonFinalObject Base;
static Arguments* create(JSGlobalData& globalData, CallFrame* callFrame)
{
Arguments* arguments = new (NotNull, allocateCell<Arguments>(globalData.heap)) Arguments(callFrame);
arguments->finishCreation(callFrame);
return arguments;
}
static Arguments* create(JSGlobalData& globalData, CallFrame* callFrame, InlineCallFrame* inlineCallFrame)
{
Arguments* arguments = new (NotNull, allocateCell<Arguments>(globalData.heap)) Arguments(callFrame);
arguments->finishCreation(callFrame, inlineCallFrame);
return arguments;
}
enum { MaxArguments = 0x10000 };
private:
enum NoParametersType { NoParameters };
Arguments(CallFrame*);
Arguments(CallFrame*, NoParametersType);
void tearOffForInlineCallFrame(JSGlobalData& globalData, Register*, InlineCallFrame*);
public:
static const ClassInfo s_info;
static void visitChildren(JSCell*, SlotVisitor&);
void fillArgList(ExecState*, MarkedArgumentBuffer&);
uint32_t length(ExecState* exec) const
{
if (UNLIKELY(d->overrodeLength))
return get(exec, exec->propertyNames().length).toUInt32(exec);
return d->numArguments;
}
void copyToArguments(ExecState*, CallFrame*, uint32_t length);
void tearOff(CallFrame*);
void tearOff(CallFrame*, InlineCallFrame*);
bool isTornOff() const { return d->registerArray; }
void didTearOffActivation(JSGlobalData& globalData, JSActivation* activation)
{
if (isTornOff())
return;
d->activation.set(globalData, this, activation);
d->registers = &activation->registerAt(0);
}
static Structure* createStructure(JSGlobalData& globalData, JSGlobalObject* globalObject, JSValue prototype)
{
return Structure::create(globalData, globalObject, prototype, TypeInfo(ObjectType, StructureFlags), &s_info);
}
static ptrdiff_t offsetOfData() { return OBJECT_OFFSETOF(Arguments, d); }
protected:
static const unsigned StructureFlags = OverridesGetOwnPropertySlot | OverridesVisitChildren | OverridesGetPropertyNames | JSObject::StructureFlags;
void finishCreation(CallFrame*);
void finishCreation(CallFrame*, InlineCallFrame*);
private:
static void destroy(JSCell*);
static bool getOwnPropertySlot(JSCell*, ExecState*, PropertyName, PropertySlot&);
static bool getOwnPropertySlotByIndex(JSCell*, ExecState*, unsigned propertyName, PropertySlot&);
static bool getOwnPropertyDescriptor(JSObject*, ExecState*, PropertyName, PropertyDescriptor&);
static void getOwnPropertyNames(JSObject*, ExecState*, PropertyNameArray&, EnumerationMode);
static void put(JSCell*, ExecState*, PropertyName, JSValue, PutPropertySlot&);
static void putByIndex(JSCell*, ExecState*, unsigned propertyName, JSValue, bool shouldThrow);
static bool deleteProperty(JSCell*, ExecState*, PropertyName);
static bool deletePropertyByIndex(JSCell*, ExecState*, unsigned propertyName);
static bool defineOwnProperty(JSObject*, ExecState*, PropertyName, PropertyDescriptor&, bool shouldThrow);
void createStrictModeCallerIfNecessary(ExecState*);
void createStrictModeCalleeIfNecessary(ExecState*);
WriteBarrier<Unknown>& argument(size_t);
void init(CallFrame*);
OwnPtr<ArgumentsData> d;
};
Arguments* asArguments(JSValue);
inline Arguments* asArguments(JSValue value)
{
ASSERT(asObject(value)->inherits(&Arguments::s_info));
return static_cast<Arguments*>(asObject(value));
}
inline Arguments::Arguments(CallFrame* callFrame)
: JSNonFinalObject(callFrame->globalData(), callFrame->lexicalGlobalObject()->argumentsStructure())
, d(adoptPtr(new ArgumentsData))
{
}
inline Arguments::Arguments(CallFrame* callFrame, NoParametersType)
: JSNonFinalObject(callFrame->globalData(), callFrame->lexicalGlobalObject()->argumentsStructure())
, d(adoptPtr(new ArgumentsData))
{
}
inline WriteBarrier<Unknown>& Arguments::argument(size_t i)
{
return d->registers[CallFrame::argumentOffset(i)];
}
inline void Arguments::finishCreation(CallFrame* callFrame)
{
Base::finishCreation(callFrame->globalData());
ASSERT(inherits(&s_info));
JSFunction* callee = jsCast<JSFunction*>(callFrame->callee());
d->numArguments = callFrame->argumentCount();
d->registers = reinterpret_cast<WriteBarrier<Unknown>*>(callFrame->registers());
d->callee.set(callFrame->globalData(), this, callee);
d->overrodeLength = false;
d->overrodeCallee = false;
d->overrodeCaller = false;
d->isStrictMode = callFrame->codeBlock()->isStrictMode();
// The bytecode generator omits op_tear_off_activation in cases of no
// declared parameters, so we need to tear off immediately.
if (d->isStrictMode || !callee->jsExecutable()->parameterCount())
tearOff(callFrame);
}
inline void Arguments::finishCreation(CallFrame* callFrame, InlineCallFrame* inlineCallFrame)
{
Base::finishCreation(callFrame->globalData());
ASSERT(inherits(&s_info));
JSFunction* callee = inlineCallFrame->callee.get();
d->numArguments = inlineCallFrame->arguments.size() - 1;
d->registers = reinterpret_cast<WriteBarrier<Unknown>*>(callFrame->registers()) + inlineCallFrame->stackOffset;
d->callee.set(callFrame->globalData(), this, callee);
d->overrodeLength = false;
d->overrodeCallee = false;
d->overrodeCaller = false;
d->isStrictMode = jsCast<FunctionExecutable*>(inlineCallFrame->executable.get())->isStrictMode();
// The bytecode generator omits op_tear_off_activation in cases of no
// declared parameters, so we need to tear off immediately.
if (d->isStrictMode || !callee->jsExecutable()->parameterCount())
tearOff(callFrame, inlineCallFrame);
}
} // namespace JSC
#endif // Arguments_h
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