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Arguments.cpp
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/*
* Copyright (C) 1999-2002 Harri Porten ([email protected])
* Copyright (C) 2001 Peter Kelly ([email protected])
* Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
* Copyright (C) 2007 Cameron Zwarich ([email protected])
* 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 "CallFrameInlines.h"
#include "JSActivation.h"
#include "JSArgumentsIterator.h"
#include "JSFunction.h"
#include "JSGlobalObject.h"
#include "Operations.h"
using namespace std;
namespace JSC {
const ClassInfo Arguments::s_info = { "Arguments", &Base::s_info, 0, 0, CREATE_METHOD_TABLE(Arguments) };
void Arguments::visitChildren(JSCell* cell, SlotVisitor& visitor)
{
Arguments* thisObject = jsCast<Arguments*>(cell);
ASSERT_GC_OBJECT_INHERITS(thisObject, info());
COMPILE_ASSERT(StructureFlags & OverridesVisitChildren, OverridesVisitChildrenWithoutSettingFlag);
ASSERT(thisObject->structure()->typeInfo().overridesVisitChildren());
JSObject::visitChildren(thisObject, visitor);
if (thisObject->m_registerArray)
visitor.appendValues(thisObject->m_registerArray.get(), thisObject->m_numArguments);
visitor.append(&thisObject->m_callee);
visitor.append(&thisObject->m_activation);
}
static EncodedJSValue JSC_HOST_CALL argumentsFuncIterator(ExecState*);
void Arguments::destroy(JSCell* cell)
{
static_cast<Arguments*>(cell)->Arguments::~Arguments();
}
void Arguments::copyToArguments(ExecState* exec, CallFrame* callFrame, uint32_t length)
{
if (UNLIKELY(m_overrodeLength)) {
length = min(get(exec, exec->propertyNames().length).toUInt32(exec), length);
for (unsigned i = 0; i < length; i++)
callFrame->setArgument(i, get(exec, i));
return;
}
ASSERT(length == this->length(exec));
for (size_t i = 0; i < length; ++i) {
if (JSValue value = tryGetArgument(i))
callFrame->setArgument(i, value);
else
callFrame->setArgument(i, get(exec, i));
}
}
void Arguments::fillArgList(ExecState* exec, MarkedArgumentBuffer& args)
{
if (UNLIKELY(m_overrodeLength)) {
unsigned length = get(exec, exec->propertyNames().length).toUInt32(exec);
for (unsigned i = 0; i < length; i++)
args.append(get(exec, i));
return;
}
uint32_t length = this->length(exec);
for (size_t i = 0; i < length; ++i) {
if (JSValue value = tryGetArgument(i))
args.append(value);
else
args.append(get(exec, i));
}
}
bool Arguments::getOwnPropertySlotByIndex(JSObject* object, ExecState* exec, unsigned i, PropertySlot& slot)
{
Arguments* thisObject = jsCast<Arguments*>(object);
if (JSValue value = thisObject->tryGetArgument(i)) {
slot.setValue(thisObject, None, value);
return true;
}
return JSObject::getOwnPropertySlot(thisObject, exec, Identifier::from(exec, i), slot);
}
void Arguments::createStrictModeCallerIfNecessary(ExecState* exec)
{
if (m_overrodeCaller)
return;
VM& vm = exec->vm();
m_overrodeCaller = true;
PropertyDescriptor descriptor;
descriptor.setAccessorDescriptor(globalObject()->throwTypeErrorGetterSetter(vm), DontEnum | DontDelete | Accessor);
methodTable()->defineOwnProperty(this, exec, vm.propertyNames->caller, descriptor, false);
}
void Arguments::createStrictModeCalleeIfNecessary(ExecState* exec)
{
if (m_overrodeCallee)
return;
VM& vm = exec->vm();
m_overrodeCallee = true;
PropertyDescriptor descriptor;
descriptor.setAccessorDescriptor(globalObject()->throwTypeErrorGetterSetter(vm), DontEnum | DontDelete | Accessor);
methodTable()->defineOwnProperty(this, exec, vm.propertyNames->callee, descriptor, false);
}
bool Arguments::getOwnPropertySlot(JSObject* object, ExecState* exec, PropertyName propertyName, PropertySlot& slot)
{
Arguments* thisObject = jsCast<Arguments*>(object);
unsigned i = propertyName.asIndex();
if (JSValue value = thisObject->tryGetArgument(i)) {
RELEASE_ASSERT(i < PropertyName::NotAnIndex);
slot.setValue(thisObject, None, value);
return true;
}
if (propertyName == exec->propertyNames().length && LIKELY(!thisObject->m_overrodeLength)) {
slot.setValue(thisObject, DontEnum, jsNumber(thisObject->m_numArguments));
return true;
}
if (propertyName == exec->propertyNames().callee && LIKELY(!thisObject->m_overrodeCallee)) {
if (!thisObject->m_isStrictMode) {
slot.setValue(thisObject, DontEnum, thisObject->m_callee.get());
return true;
}
thisObject->createStrictModeCalleeIfNecessary(exec);
}
if (propertyName == exec->propertyNames().caller && thisObject->m_isStrictMode)
thisObject->createStrictModeCallerIfNecessary(exec);
if (JSObject::getOwnPropertySlot(thisObject, exec, propertyName, slot))
return true;
if (propertyName == exec->propertyNames().iteratorPrivateName) {
VM& vm = exec->vm();
JSGlobalObject* globalObject = exec->lexicalGlobalObject();
thisObject->JSC_NATIVE_FUNCTION(exec->propertyNames().iteratorPrivateName, argumentsFuncIterator, DontEnum, 0);
if (JSObject::getOwnPropertySlot(thisObject, exec, propertyName, slot))
return true;
}
return false;
}
void Arguments::getOwnPropertyNames(JSObject* object, ExecState* exec, PropertyNameArray& propertyNames, EnumerationMode mode)
{
Arguments* thisObject = jsCast<Arguments*>(object);
for (unsigned i = 0; i < thisObject->m_numArguments; ++i) {
if (!thisObject->isArgument(i))
continue;
propertyNames.add(Identifier::from(exec, i));
}
if (mode == IncludeDontEnumProperties) {
propertyNames.add(exec->propertyNames().callee);
propertyNames.add(exec->propertyNames().length);
}
JSObject::getOwnPropertyNames(thisObject, exec, propertyNames, mode);
}
void Arguments::putByIndex(JSCell* cell, ExecState* exec, unsigned i, JSValue value, bool shouldThrow)
{
Arguments* thisObject = jsCast<Arguments*>(cell);
if (thisObject->trySetArgument(exec->vm(), i, value))
return;
PutPropertySlot slot(thisObject, shouldThrow);
JSObject::put(thisObject, exec, Identifier::from(exec, i), value, slot);
}
void Arguments::put(JSCell* cell, ExecState* exec, PropertyName propertyName, JSValue value, PutPropertySlot& slot)
{
Arguments* thisObject = jsCast<Arguments*>(cell);
unsigned i = propertyName.asIndex();
if (thisObject->trySetArgument(exec->vm(), i, value))
return;
if (propertyName == exec->propertyNames().length && !thisObject->m_overrodeLength) {
thisObject->m_overrodeLength = true;
thisObject->putDirect(exec->vm(), propertyName, value, DontEnum);
return;
}
if (propertyName == exec->propertyNames().callee && !thisObject->m_overrodeCallee) {
if (!thisObject->m_isStrictMode) {
thisObject->m_overrodeCallee = true;
thisObject->putDirect(exec->vm(), propertyName, value, DontEnum);
return;
}
thisObject->createStrictModeCalleeIfNecessary(exec);
}
if (propertyName == exec->propertyNames().caller && thisObject->m_isStrictMode)
thisObject->createStrictModeCallerIfNecessary(exec);
JSObject::put(thisObject, exec, propertyName, value, slot);
}
bool Arguments::deletePropertyByIndex(JSCell* cell, ExecState* exec, unsigned i)
{
Arguments* thisObject = jsCast<Arguments*>(cell);
if (i < thisObject->m_numArguments) {
if (!Base::deletePropertyByIndex(cell, exec, i))
return false;
if (thisObject->tryDeleteArgument(i))
return true;
}
return JSObject::deletePropertyByIndex(thisObject, exec, i);
}
bool Arguments::deleteProperty(JSCell* cell, ExecState* exec, PropertyName propertyName)
{
if (exec->vm().isInDefineOwnProperty())
return Base::deleteProperty(cell, exec, propertyName);
Arguments* thisObject = jsCast<Arguments*>(cell);
unsigned i = propertyName.asIndex();
if (i < thisObject->m_numArguments) {
RELEASE_ASSERT(i < PropertyName::NotAnIndex);
if (!Base::deleteProperty(cell, exec, propertyName))
return false;
if (thisObject->tryDeleteArgument(i))
return true;
}
if (propertyName == exec->propertyNames().length && !thisObject->m_overrodeLength) {
thisObject->m_overrodeLength = true;
return true;
}
if (propertyName == exec->propertyNames().callee && !thisObject->m_overrodeCallee) {
if (!thisObject->m_isStrictMode) {
thisObject->m_overrodeCallee = true;
return true;
}
thisObject->createStrictModeCalleeIfNecessary(exec);
}
if (propertyName == exec->propertyNames().caller && thisObject->m_isStrictMode)
thisObject->createStrictModeCallerIfNecessary(exec);
return JSObject::deleteProperty(thisObject, exec, propertyName);
}
bool Arguments::defineOwnProperty(JSObject* object, ExecState* exec, PropertyName propertyName, const PropertyDescriptor& descriptor, bool shouldThrow)
{
Arguments* thisObject = jsCast<Arguments*>(object);
unsigned i = propertyName.asIndex();
if (i < thisObject->m_numArguments) {
RELEASE_ASSERT(i < PropertyName::NotAnIndex);
// If the property is not yet present on the object, and is not yet marked as deleted, then add it now.
PropertySlot slot(thisObject);
if (!thisObject->isDeletedArgument(i) && !JSObject::getOwnPropertySlot(thisObject, exec, propertyName, slot)) {
JSValue value = thisObject->tryGetArgument(i);
ASSERT(value);
object->putDirectMayBeIndex(exec, propertyName, value);
}
if (!Base::defineOwnProperty(object, exec, propertyName, descriptor, shouldThrow))
return false;
// From ES 5.1, 10.6 Arguments Object
// 5. If the value of isMapped is not undefined, then
if (thisObject->isArgument(i)) {
// a. If IsAccessorDescriptor(Desc) is true, then
if (descriptor.isAccessorDescriptor()) {
// i. Call the [[Delete]] internal method of map passing P, and false as the arguments.
thisObject->tryDeleteArgument(i);
} else { // b. Else
// i. If Desc.[[Value]] is present, then
// 1. Call the [[Put]] internal method of map passing P, Desc.[[Value]], and Throw as the arguments.
if (descriptor.value())
thisObject->trySetArgument(exec->vm(), i, descriptor.value());
// ii. If Desc.[[Writable]] is present and its value is false, then
// 1. Call the [[Delete]] internal method of map passing P and false as arguments.
if (descriptor.writablePresent() && !descriptor.writable())
thisObject->tryDeleteArgument(i);
}
}
return true;
}
if (propertyName == exec->propertyNames().length && !thisObject->m_overrodeLength) {
thisObject->putDirect(exec->vm(), propertyName, jsNumber(thisObject->m_numArguments), DontEnum);
thisObject->m_overrodeLength = true;
} else if (propertyName == exec->propertyNames().callee && !thisObject->m_overrodeCallee) {
thisObject->putDirect(exec->vm(), propertyName, thisObject->m_callee.get(), DontEnum);
thisObject->m_overrodeCallee = true;
} else if (propertyName == exec->propertyNames().caller && thisObject->m_isStrictMode)
thisObject->createStrictModeCallerIfNecessary(exec);
return Base::defineOwnProperty(object, exec, propertyName, descriptor, shouldThrow);
}
void Arguments::tearOff(CallFrame* callFrame)
{
if (isTornOff())
return;
if (!m_numArguments)
return;
// Must be called for the same call frame from which it was created.
ASSERT(bitwise_cast<WriteBarrier<Unknown>*>(callFrame) == m_registers);
m_registerArray = std::make_unique<WriteBarrier<Unknown>[]>(m_numArguments);
m_registers = m_registerArray.get() - CallFrame::offsetFor(1) - 1;
// If we have a captured argument that logically aliases activation storage,
// but we optimize away the activation, the argument needs to tear off into
// our storage. The simplest way to do this is to revert it to Normal status.
if (m_slowArgumentData && !m_activation) {
for (size_t i = 0; i < m_numArguments; ++i) {
if (m_slowArgumentData->slowArguments[i].status != SlowArgument::Captured)
continue;
m_slowArgumentData->slowArguments[i].status = SlowArgument::Normal;
m_slowArgumentData->slowArguments[i].index = CallFrame::argumentOffset(i);
}
}
for (size_t i = 0; i < m_numArguments; ++i)
trySetArgument(callFrame->vm(), i, callFrame->argumentAfterCapture(i));
}
void Arguments::didTearOffActivation(ExecState* exec, JSActivation* activation)
{
RELEASE_ASSERT(activation);
if (isTornOff())
return;
if (!m_numArguments)
return;
m_activation.set(exec->vm(), this, activation);
tearOff(exec);
}
void Arguments::tearOff(CallFrame* callFrame, InlineCallFrame* inlineCallFrame)
{
if (isTornOff())
return;
if (!m_numArguments)
return;
m_registerArray = std::make_unique<WriteBarrier<Unknown>[]>(m_numArguments);
m_registers = m_registerArray.get() - CallFrame::offsetFor(1) - 1;
for (size_t i = 0; i < m_numArguments; ++i) {
ValueRecovery& recovery = inlineCallFrame->arguments[i + 1];
trySetArgument(callFrame->vm(), i, recovery.recover(callFrame));
}
}
EncodedJSValue JSC_HOST_CALL argumentsFuncIterator(ExecState* exec)
{
JSObject* thisObj = exec->hostThisValue().toThis(exec, StrictMode).toObject(exec);
Arguments* arguments = jsDynamicCast<Arguments*>(thisObj);
if (!arguments)
return JSValue::encode(throwTypeError(exec, "Attempted to use Arguments iterator on non-Arguments object"));
return JSValue::encode(JSArgumentsIterator::create(exec->vm(), exec->callee()->globalObject()->argumentsIteratorStructure(), arguments));
}
} // namespace JSC