[apple/javascriptcore.git] / runtime / Arguments.cpp

/*
 *  Copyright (C) 1999-2002 Harri Porten (porten@kde.org)
 *  Copyright (C) 2001 Peter Kelly (pmk@post.com)
 *  Copyright (C) 2003, 2004, 2005, 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.
 *
 */

#include "config.h"
#include "Arguments.h"

#include "JSActivation.h"
#include "JSFunction.h"
#include "JSGlobalObject.h"

using namespace std;

namespace JSC {

ASSERT_CLASS_FITS_IN_CELL(Arguments);

const ClassInfo Arguments::s_info = { "Arguments", &JSNonFinalObject::s_info, 0, 0 };

Arguments::~Arguments()
{
    if (d->extraArguments != d->extraArgumentsFixedBuffer)
        delete [] d->extraArguments;
}

void Arguments::visitChildren(SlotVisitor& visitor)
{
    ASSERT_GC_OBJECT_INHERITS(this, &s_info);
    COMPILE_ASSERT(StructureFlags & OverridesVisitChildren, OverridesVisitChildrenWithoutSettingFlag);
    ASSERT(structure()->typeInfo().overridesVisitChildren());
    JSObject::visitChildren(visitor);

    if (d->registerArray)
        visitor.appendValues(d->registerArray.get(), d->numParameters);

    if (d->extraArguments) {
        unsigned numExtraArguments = d->numArguments - d->numParameters;
        visitor.appendValues(d->extraArguments, numExtraArguments);
    }

    visitor.append(&d->callee);

    if (d->activation)
        visitor.append(&d->activation);
}

void Arguments::copyToRegisters(ExecState* exec, Register* buffer, uint32_t maxSize)
{
    if (UNLIKELY(d->overrodeLength)) {
        unsigned length = min(get(exec, exec->propertyNames().length).toUInt32(exec), maxSize);
        for (unsigned i = 0; i < length; i++)
            buffer[i] = get(exec, i);
        return;
    }

    if (LIKELY(!d->deletedArguments)) {
        unsigned parametersLength = min(min(d->numParameters, d->numArguments), maxSize);
        unsigned i = 0;
        for (; i < parametersLength; ++i)
            buffer[i] = d->registers[d->firstParameterIndex + i].get();
        for (; i < d->numArguments; ++i)
            buffer[i] = d->extraArguments[i - d->numParameters].get();
        return;
    }
    
    unsigned parametersLength = min(min(d->numParameters, d->numArguments), maxSize);
    unsigned i = 0;
    for (; i < parametersLength; ++i) {
        if (!d->deletedArguments[i])
            buffer[i] = d->registers[d->firstParameterIndex + i].get();
        else
            buffer[i] = get(exec, i);
    }
    for (; i < d->numArguments; ++i) {
        if (!d->deletedArguments[i])
            buffer[i] = d->extraArguments[i - d->numParameters].get();
        else
            buffer[i] = get(exec, i);
    }
}

void Arguments::fillArgList(ExecState* exec, MarkedArgumentBuffer& args)
{
    if (UNLIKELY(d->overrodeLength)) {
        unsigned length = get(exec, exec->propertyNames().length).toUInt32(exec); 
        for (unsigned i = 0; i < length; i++) 
            args.append(get(exec, i)); 
        return;
    }

    if (LIKELY(!d->deletedArguments)) {
        if (LIKELY(!d->numParameters)) {
            args.initialize(d->extraArguments, d->numArguments);
            return;
        }

        if (d->numParameters == d->numArguments) {
            args.initialize(&d->registers[d->firstParameterIndex], d->numArguments);
            return;
        }

        unsigned parametersLength = min(d->numParameters, d->numArguments);
        unsigned i = 0;
        for (; i < parametersLength; ++i)
            args.append(d->registers[d->firstParameterIndex + i].get());
        for (; i < d->numArguments; ++i)
            args.append(d->extraArguments[i - d->numParameters].get());
        return;
    }

    unsigned parametersLength = min(d->numParameters, d->numArguments);
    unsigned i = 0;
    for (; i < parametersLength; ++i) {
        if (!d->deletedArguments[i])
            args.append(d->registers[d->firstParameterIndex + i].get());
        else
            args.append(get(exec, i));
    }
    for (; i < d->numArguments; ++i) {
        if (!d->deletedArguments[i])
            args.append(d->extraArguments[i - d->numParameters].get());
        else
            args.append(get(exec, i));
    }
}

bool Arguments::getOwnPropertySlot(ExecState* exec, unsigned i, PropertySlot& slot)
{
    if (i < d->numArguments && (!d->deletedArguments || !d->deletedArguments[i])) {
        if (i < d->numParameters) {
            slot.setValue(d->registers[d->firstParameterIndex + i].get());
        } else
            slot.setValue(d->extraArguments[i - d->numParameters].get());
        return true;
    }

    return JSObject::getOwnPropertySlot(exec, Identifier(exec, UString::number(i)), slot);
}
    
void Arguments::createStrictModeCallerIfNecessary(ExecState* exec)
{
    if (d->overrodeCaller)
        return;

    d->overrodeCaller = true;
    PropertyDescriptor descriptor;
    JSValue thrower = createTypeErrorFunction(exec, "Unable to access caller of strict mode function");
    descriptor.setAccessorDescriptor(thrower, thrower, DontEnum | DontDelete | Getter | Setter);
    defineOwnProperty(exec, exec->propertyNames().caller, descriptor, false);
}

void Arguments::createStrictModeCalleeIfNecessary(ExecState* exec)
{
    if (d->overrodeCallee)
        return;
    
    d->overrodeCallee = true;
    PropertyDescriptor descriptor;
    JSValue thrower = createTypeErrorFunction(exec, "Unable to access callee of strict mode function");
    descriptor.setAccessorDescriptor(thrower, thrower, DontEnum | DontDelete | Getter | Setter);
    defineOwnProperty(exec, exec->propertyNames().callee, descriptor, false);
}

bool Arguments::getOwnPropertySlot(ExecState* exec, const Identifier& propertyName, PropertySlot& slot)
{
    bool isArrayIndex;
    unsigned i = propertyName.toArrayIndex(isArrayIndex);
    if (isArrayIndex && i < d->numArguments && (!d->deletedArguments || !d->deletedArguments[i])) {
        if (i < d->numParameters) {
            slot.setValue(d->registers[d->firstParameterIndex + i].get());
        } else
            slot.setValue(d->extraArguments[i - d->numParameters].get());
        return true;
    }

    if (propertyName == exec->propertyNames().length && LIKELY(!d->overrodeLength)) {
        slot.setValue(jsNumber(d->numArguments));
        return true;
    }

    if (propertyName == exec->propertyNames().callee && LIKELY(!d->overrodeCallee)) {
        if (!d->isStrictMode) {
            slot.setValue(d->callee.get());
            return true;
        }
        createStrictModeCalleeIfNecessary(exec);
    }

    if (propertyName == exec->propertyNames().caller && d->isStrictMode)
        createStrictModeCallerIfNecessary(exec);

    return JSObject::getOwnPropertySlot(exec, propertyName, slot);
}

bool Arguments::getOwnPropertyDescriptor(ExecState* exec, const Identifier& propertyName, PropertyDescriptor& descriptor)
{
    bool isArrayIndex;
    unsigned i = propertyName.toArrayIndex(isArrayIndex);
    if (isArrayIndex && i < d->numArguments && (!d->deletedArguments || !d->deletedArguments[i])) {
        if (i < d->numParameters) {
            descriptor.setDescriptor(d->registers[d->firstParameterIndex + i].get(), DontEnum);
        } else
            descriptor.setDescriptor(d->extraArguments[i - d->numParameters].get(), DontEnum);
        return true;
    }
    
    if (propertyName == exec->propertyNames().length && LIKELY(!d->overrodeLength)) {
        descriptor.setDescriptor(jsNumber(d->numArguments), DontEnum);
        return true;
    }
    
    if (propertyName == exec->propertyNames().callee && LIKELY(!d->overrodeCallee)) {
        if (!d->isStrictMode) {
            descriptor.setDescriptor(d->callee.get(), DontEnum);
            return true;
        }
        createStrictModeCalleeIfNecessary(exec);
    }

    if (propertyName == exec->propertyNames().caller && d->isStrictMode)
        createStrictModeCallerIfNecessary(exec);
    
    return JSObject::getOwnPropertyDescriptor(exec, propertyName, descriptor);
}

void Arguments::getOwnPropertyNames(ExecState* exec, PropertyNameArray& propertyNames, EnumerationMode mode)
{
    if (mode == IncludeDontEnumProperties) {
        for (unsigned i = 0; i < d->numArguments; ++i) {
            if (!d->deletedArguments || !d->deletedArguments[i])
                propertyNames.add(Identifier(exec, UString::number(i)));
        }
        propertyNames.add(exec->propertyNames().callee);
        propertyNames.add(exec->propertyNames().length);
    }
    JSObject::getOwnPropertyNames(exec, propertyNames, mode);
}

void Arguments::put(ExecState* exec, unsigned i, JSValue value)
{
    if (i < d->numArguments && (!d->deletedArguments || !d->deletedArguments[i])) {
        if (i < d->numParameters)
            d->registers[d->firstParameterIndex + i].set(exec->globalData(), d->activation ? static_cast<JSCell*>(d->activation.get()) : static_cast<JSCell*>(this), value);
        else
            d->extraArguments[i - d->numParameters].set(exec->globalData(), this, value);
        return;
    }

    PutPropertySlot slot;
    JSObject::put(exec, Identifier(exec, UString::number(i)), value, slot);
}

void Arguments::put(ExecState* exec, const Identifier& propertyName, JSValue value, PutPropertySlot& slot)
{
    bool isArrayIndex;
    unsigned i = propertyName.toArrayIndex(isArrayIndex);
    if (isArrayIndex && i < d->numArguments && (!d->deletedArguments || !d->deletedArguments[i])) {
        if (i < d->numParameters)
            d->registers[d->firstParameterIndex + i].set(exec->globalData(), d->activation ? static_cast<JSCell*>(d->activation.get()) : static_cast<JSCell*>(this), value);
        else
            d->extraArguments[i - d->numParameters].set(exec->globalData(), this, value);
        return;
    }

    if (propertyName == exec->propertyNames().length && !d->overrodeLength) {
        d->overrodeLength = true;
        putDirect(exec->globalData(), propertyName, value, DontEnum);
        return;
    }

    if (propertyName == exec->propertyNames().callee && !d->overrodeCallee) {
        if (!d->isStrictMode) {
            d->overrodeCallee = true;
            putDirect(exec->globalData(), propertyName, value, DontEnum);
            return;
        }
        createStrictModeCalleeIfNecessary(exec);
    }

    if (propertyName == exec->propertyNames().caller && d->isStrictMode)
        createStrictModeCallerIfNecessary(exec);

    JSObject::put(exec, propertyName, value, slot);
}

bool Arguments::deleteProperty(ExecState* exec, unsigned i) 
{
    if (i < d->numArguments) {
        if (!d->deletedArguments) {
            d->deletedArguments = adoptArrayPtr(new bool[d->numArguments]);
            memset(d->deletedArguments.get(), 0, sizeof(bool) * d->numArguments);
        }
        if (!d->deletedArguments[i]) {
            d->deletedArguments[i] = true;
            return true;
        }
    }

    return JSObject::deleteProperty(exec, Identifier(exec, UString::number(i)));
}

bool Arguments::deleteProperty(ExecState* exec, const Identifier& propertyName) 
{
    bool isArrayIndex;
    unsigned i = propertyName.toArrayIndex(isArrayIndex);
    if (isArrayIndex && i < d->numArguments) {
        if (!d->deletedArguments) {
            d->deletedArguments = adoptArrayPtr(new bool[d->numArguments]);
            memset(d->deletedArguments.get(), 0, sizeof(bool) * d->numArguments);
        }
        if (!d->deletedArguments[i]) {
            d->deletedArguments[i] = true;
            return true;
        }
    }

    if (propertyName == exec->propertyNames().length && !d->overrodeLength) {
        d->overrodeLength = true;
        return true;
    }

    if (propertyName == exec->propertyNames().callee && !d->overrodeCallee) {
        if (!d->isStrictMode) {
            d->overrodeCallee = true;
            return true;
        }
        createStrictModeCalleeIfNecessary(exec);
    }
    
    if (propertyName == exec->propertyNames().caller && !d->isStrictMode)
        createStrictModeCallerIfNecessary(exec);

    return JSObject::deleteProperty(exec, propertyName);
}

} // namespace JSC
Commit	Line	Data
9dae56ea A	1	/*
	2	* Copyright (C) 1999-2002 Harri Porten (porten@kde.org)
	3	* Copyright (C) 2001 Peter Kelly (pmk@post.com)
f9bf01c6	4	* Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
9dae56ea A	5	* Copyright (C) 2007 Cameron Zwarich (cwzwarich@uwaterloo.ca)
	6	* Copyright (C) 2007 Maks Orlovich
	7	*
	8	* This library is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU Library General Public
	10	* License as published by the Free Software Foundation; either
	11	* version 2 of the License, or (at your option) any later version.
	12	*
	13	* This library is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	16	* Library General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU Library General Public License
	19	* along with this library; see the file COPYING.LIB. If not, write to
	20	* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
	21	* Boston, MA 02110-1301, USA.
	22	*
	23	*/
	24
	25	#include "config.h"
	26	#include "Arguments.h"
	27
	28	#include "JSActivation.h"
	29	#include "JSFunction.h"
	30	#include "JSGlobalObject.h"
	31
	32	using namespace std;
	33
	34	namespace JSC {
	35
	36	ASSERT_CLASS_FITS_IN_CELL(Arguments);
	37
14957cd0	38	const ClassInfo Arguments::s_info = { "Arguments", &JSNonFinalObject::s_info, 0, 0 };
9dae56ea A	39
	40	Arguments::~Arguments()
	41	{
	42	if (d->extraArguments != d->extraArgumentsFixedBuffer)
	43	delete [] d->extraArguments;
	44	}
	45
14957cd0	46	void Arguments::visitChildren(SlotVisitor& visitor)
9dae56ea	47	{
14957cd0 A	48	ASSERT_GC_OBJECT_INHERITS(this, &s_info);
	49	COMPILE_ASSERT(StructureFlags & OverridesVisitChildren, OverridesVisitChildrenWithoutSettingFlag);
	50	ASSERT(structure()->typeInfo().overridesVisitChildren());
	51	JSObject::visitChildren(visitor);
9dae56ea	52
f9bf01c6	53	if (d->registerArray)
14957cd0	54	visitor.appendValues(d->registerArray.get(), d->numParameters);
9dae56ea A	55
	56	if (d->extraArguments) {
	57	unsigned numExtraArguments = d->numArguments - d->numParameters;
14957cd0	58	visitor.appendValues(d->extraArguments, numExtraArguments);
9dae56ea A	59	}
9dae56ea A	60
14957cd0	61	visitor.append(&d->callee);
9dae56ea	62
f9bf01c6	63	if (d->activation)
14957cd0	64	visitor.append(&d->activation);
9dae56ea A	65	}
9dae56ea A	66
ba379fdc	67	void Arguments::copyToRegisters(ExecState* exec, Register* buffer, uint32_t maxSize)
9dae56ea	68	{
ba379fdc A	69	if (UNLIKELY(d->overrodeLength)) {
	70	unsigned length = min(get(exec, exec->propertyNames().length).toUInt32(exec), maxSize);
	71	for (unsigned i = 0; i < length; i++)
	72	buffer[i] = get(exec, i);
	73	return;
	74	}
	75
	76	if (LIKELY(!d->deletedArguments)) {
	77	unsigned parametersLength = min(min(d->numParameters, d->numArguments), maxSize);
	78	unsigned i = 0;
	79	for (; i < parametersLength; ++i)
14957cd0	80	buffer[i] = d->registers[d->firstParameterIndex + i].get();
ba379fdc	81	for (; i < d->numArguments; ++i)
14957cd0	82	buffer[i] = d->extraArguments[i - d->numParameters].get();
ba379fdc A	83	return;
	84	}
	85
	86	unsigned parametersLength = min(min(d->numParameters, d->numArguments), maxSize);
	87	unsigned i = 0;
	88	for (; i < parametersLength; ++i) {
	89	if (!d->deletedArguments[i])
14957cd0	90	buffer[i] = d->registers[d->firstParameterIndex + i].get();
ba379fdc A	91	else
	92	buffer[i] = get(exec, i);
	93	}
	94	for (; i < d->numArguments; ++i) {
	95	if (!d->deletedArguments[i])
14957cd0	96	buffer[i] = d->extraArguments[i - d->numParameters].get();
ba379fdc A	97	else
	98	buffer[i] = get(exec, i);
	99	}
	100	}
	101
	102	void Arguments::fillArgList(ExecState* exec, MarkedArgumentBuffer& args)
	103	{
	104	if (UNLIKELY(d->overrodeLength)) {
	105	unsigned length = get(exec, exec->propertyNames().length).toUInt32(exec);
	106	for (unsigned i = 0; i < length; i++)
	107	args.append(get(exec, i));
	108	return;
	109	}
	110
9dae56ea A	111	if (LIKELY(!d->deletedArguments)) {
	112	if (LIKELY(!d->numParameters)) {
	113	args.initialize(d->extraArguments, d->numArguments);
	114	return;
	115	}
	116
	117	if (d->numParameters == d->numArguments) {
	118	args.initialize(&d->registers[d->firstParameterIndex], d->numArguments);
	119	return;
	120	}
	121
	122	unsigned parametersLength = min(d->numParameters, d->numArguments);
	123	unsigned i = 0;
	124	for (; i < parametersLength; ++i)
14957cd0	125	args.append(d->registers[d->firstParameterIndex + i].get());
9dae56ea	126	for (; i < d->numArguments; ++i)
14957cd0	127	args.append(d->extraArguments[i - d->numParameters].get());
9dae56ea A	128	return;
	129	}
	130
	131	unsigned parametersLength = min(d->numParameters, d->numArguments);
	132	unsigned i = 0;
	133	for (; i < parametersLength; ++i) {
	134	if (!d->deletedArguments[i])
14957cd0	135	args.append(d->registers[d->firstParameterIndex + i].get());
9dae56ea A	136	else
	137	args.append(get(exec, i));
	138	}
	139	for (; i < d->numArguments; ++i) {
	140	if (!d->deletedArguments[i])
14957cd0	141	args.append(d->extraArguments[i - d->numParameters].get());
9dae56ea A	142	else
	143	args.append(get(exec, i));
	144	}
	145	}
	146
	147	bool Arguments::getOwnPropertySlot(ExecState* exec, unsigned i, PropertySlot& slot)
	148	{
	149	if (i < d->numArguments && (!d->deletedArguments \|\| !d->deletedArguments[i])) {
	150	if (i < d->numParameters) {
14957cd0	151	slot.setValue(d->registers[d->firstParameterIndex + i].get());
9dae56ea	152	} else
14957cd0	153	slot.setValue(d->extraArguments[i - d->numParameters].get());
9dae56ea A	154	return true;
	155	}
	156
14957cd0 A	157	return JSObject::getOwnPropertySlot(exec, Identifier(exec, UString::number(i)), slot);
	158	}
	159
	160	void Arguments::createStrictModeCallerIfNecessary(ExecState* exec)
	161	{
	162	if (d->overrodeCaller)
	163	return;
	164
	165	d->overrodeCaller = true;
	166	PropertyDescriptor descriptor;
	167	JSValue thrower = createTypeErrorFunction(exec, "Unable to access caller of strict mode function");
	168	descriptor.setAccessorDescriptor(thrower, thrower, DontEnum \| DontDelete \| Getter \| Setter);
	169	defineOwnProperty(exec, exec->propertyNames().caller, descriptor, false);
	170	}
	171
	172	void Arguments::createStrictModeCalleeIfNecessary(ExecState* exec)
	173	{
	174	if (d->overrodeCallee)
	175	return;
	176
	177	d->overrodeCallee = true;
	178	PropertyDescriptor descriptor;
	179	JSValue thrower = createTypeErrorFunction(exec, "Unable to access callee of strict mode function");
	180	descriptor.setAccessorDescriptor(thrower, thrower, DontEnum \| DontDelete \| Getter \| Setter);
	181	defineOwnProperty(exec, exec->propertyNames().callee, descriptor, false);
9dae56ea A	182	}
	183
	184	bool Arguments::getOwnPropertySlot(ExecState* exec, const Identifier& propertyName, PropertySlot& slot)
	185	{
	186	bool isArrayIndex;
14957cd0	187	unsigned i = propertyName.toArrayIndex(isArrayIndex);
9dae56ea A	188	if (isArrayIndex && i < d->numArguments && (!d->deletedArguments \|\| !d->deletedArguments[i])) {
9dae56ea A	189	if (i < d->numParameters) {
14957cd0	190	slot.setValue(d->registers[d->firstParameterIndex + i].get());
9dae56ea	191	} else
14957cd0	192	slot.setValue(d->extraArguments[i - d->numParameters].get());
9dae56ea A	193	return true;
	194	}
	195
	196	if (propertyName == exec->propertyNames().length && LIKELY(!d->overrodeLength)) {
14957cd0	197	slot.setValue(jsNumber(d->numArguments));
9dae56ea A	198	return true;
	199	}
	200
	201	if (propertyName == exec->propertyNames().callee && LIKELY(!d->overrodeCallee)) {
14957cd0 A	202	if (!d->isStrictMode) {
	203	slot.setValue(d->callee.get());
	204	return true;
	205	}
	206	createStrictModeCalleeIfNecessary(exec);
9dae56ea A	207	}
9dae56ea A	208
14957cd0 A	209	if (propertyName == exec->propertyNames().caller && d->isStrictMode)
	210	createStrictModeCallerIfNecessary(exec);
	211
9dae56ea A	212	return JSObject::getOwnPropertySlot(exec, propertyName, slot);
	213	}
	214
f9bf01c6 A	215	bool Arguments::getOwnPropertyDescriptor(ExecState* exec, const Identifier& propertyName, PropertyDescriptor& descriptor)
	216	{
	217	bool isArrayIndex;
14957cd0	218	unsigned i = propertyName.toArrayIndex(isArrayIndex);
f9bf01c6 A	219	if (isArrayIndex && i < d->numArguments && (!d->deletedArguments \|\| !d->deletedArguments[i])) {
f9bf01c6 A	220	if (i < d->numParameters) {
14957cd0	221	descriptor.setDescriptor(d->registers[d->firstParameterIndex + i].get(), DontEnum);
f9bf01c6	222	} else
14957cd0	223	descriptor.setDescriptor(d->extraArguments[i - d->numParameters].get(), DontEnum);
f9bf01c6 A	224	return true;
	225	}
	226
	227	if (propertyName == exec->propertyNames().length && LIKELY(!d->overrodeLength)) {
14957cd0	228	descriptor.setDescriptor(jsNumber(d->numArguments), DontEnum);
f9bf01c6 A	229	return true;
	230	}
	231
	232	if (propertyName == exec->propertyNames().callee && LIKELY(!d->overrodeCallee)) {
14957cd0 A	233	if (!d->isStrictMode) {
	234	descriptor.setDescriptor(d->callee.get(), DontEnum);
	235	return true;
	236	}
	237	createStrictModeCalleeIfNecessary(exec);
f9bf01c6	238	}
14957cd0 A	239
	240	if (propertyName == exec->propertyNames().caller && d->isStrictMode)
	241	createStrictModeCallerIfNecessary(exec);
f9bf01c6 A	242
	243	return JSObject::getOwnPropertyDescriptor(exec, propertyName, descriptor);
	244	}
	245
	246	void Arguments::getOwnPropertyNames(ExecState* exec, PropertyNameArray& propertyNames, EnumerationMode mode)
	247	{
	248	if (mode == IncludeDontEnumProperties) {
	249	for (unsigned i = 0; i < d->numArguments; ++i) {
	250	if (!d->deletedArguments \|\| !d->deletedArguments[i])
14957cd0	251	propertyNames.add(Identifier(exec, UString::number(i)));
f9bf01c6 A	252	}
	253	propertyNames.add(exec->propertyNames().callee);
	254	propertyNames.add(exec->propertyNames().length);
	255	}
	256	JSObject::getOwnPropertyNames(exec, propertyNames, mode);
	257	}
	258
14957cd0	259	void Arguments::put(ExecState* exec, unsigned i, JSValue value)
9dae56ea A	260	{
	261	if (i < d->numArguments && (!d->deletedArguments \|\| !d->deletedArguments[i])) {
	262	if (i < d->numParameters)
14957cd0	263	d->registers[d->firstParameterIndex + i].set(exec->globalData(), d->activation ? static_cast<JSCell>(d->activation.get()) : static_cast<JSCell>(this), value);
9dae56ea	264	else
14957cd0	265	d->extraArguments[i - d->numParameters].set(exec->globalData(), this, value);
9dae56ea A	266	return;
	267	}
	268
14957cd0 A	269	PutPropertySlot slot;
14957cd0 A	270	JSObject::put(exec, Identifier(exec, UString::number(i)), value, slot);
9dae56ea A	271	}
9dae56ea A	272
ba379fdc	273	void Arguments::put(ExecState* exec, const Identifier& propertyName, JSValue value, PutPropertySlot& slot)
9dae56ea A	274	{
9dae56ea A	275	bool isArrayIndex;
14957cd0	276	unsigned i = propertyName.toArrayIndex(isArrayIndex);
9dae56ea A	277	if (isArrayIndex && i < d->numArguments && (!d->deletedArguments \|\| !d->deletedArguments[i])) {
9dae56ea A	278	if (i < d->numParameters)
14957cd0	279	d->registers[d->firstParameterIndex + i].set(exec->globalData(), d->activation ? static_cast<JSCell>(d->activation.get()) : static_cast<JSCell>(this), value);
9dae56ea	280	else
14957cd0	281	d->extraArguments[i - d->numParameters].set(exec->globalData(), this, value);
9dae56ea A	282	return;
	283	}
	284
	285	if (propertyName == exec->propertyNames().length && !d->overrodeLength) {
	286	d->overrodeLength = true;
14957cd0	287	putDirect(exec->globalData(), propertyName, value, DontEnum);
9dae56ea A	288	return;
	289	}
	290
	291	if (propertyName == exec->propertyNames().callee && !d->overrodeCallee) {
14957cd0 A	292	if (!d->isStrictMode) {
	293	d->overrodeCallee = true;
	294	putDirect(exec->globalData(), propertyName, value, DontEnum);
	295	return;
	296	}
	297	createStrictModeCalleeIfNecessary(exec);
9dae56ea A	298	}
9dae56ea A	299
14957cd0 A	300	if (propertyName == exec->propertyNames().caller && d->isStrictMode)
	301	createStrictModeCallerIfNecessary(exec);
	302
9dae56ea A	303	JSObject::put(exec, propertyName, value, slot);
	304	}
	305
	306	bool Arguments::deleteProperty(ExecState* exec, unsigned i)
	307	{
	308	if (i < d->numArguments) {
	309	if (!d->deletedArguments) {
14957cd0	310	d->deletedArguments = adoptArrayPtr(new bool[d->numArguments]);
9dae56ea A	311	memset(d->deletedArguments.get(), 0, sizeof(bool) * d->numArguments);
	312	}
	313	if (!d->deletedArguments[i]) {
	314	d->deletedArguments[i] = true;
	315	return true;
	316	}
	317	}
	318
14957cd0	319	return JSObject::deleteProperty(exec, Identifier(exec, UString::number(i)));
9dae56ea A	320	}
	321
	322	bool Arguments::deleteProperty(ExecState* exec, const Identifier& propertyName)
	323	{
	324	bool isArrayIndex;
14957cd0	325	unsigned i = propertyName.toArrayIndex(isArrayIndex);
9dae56ea A	326	if (isArrayIndex && i < d->numArguments) {
9dae56ea A	327	if (!d->deletedArguments) {
14957cd0	328	d->deletedArguments = adoptArrayPtr(new bool[d->numArguments]);
9dae56ea A	329	memset(d->deletedArguments.get(), 0, sizeof(bool) * d->numArguments);
	330	}
	331	if (!d->deletedArguments[i]) {
	332	d->deletedArguments[i] = true;
	333	return true;
	334	}
	335	}
	336
	337	if (propertyName == exec->propertyNames().length && !d->overrodeLength) {
	338	d->overrodeLength = true;
	339	return true;
	340	}
	341
	342	if (propertyName == exec->propertyNames().callee && !d->overrodeCallee) {
14957cd0 A	343	if (!d->isStrictMode) {
	344	d->overrodeCallee = true;
	345	return true;
	346	}
	347	createStrictModeCalleeIfNecessary(exec);
9dae56ea	348	}
14957cd0 A	349
	350	if (propertyName == exec->propertyNames().caller && !d->isStrictMode)
	351	createStrictModeCallerIfNecessary(exec);
9dae56ea A	352
	353	return JSObject::deleteProperty(exec, propertyName);
	354	}
	355
	356	} // namespace JSC