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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.
* 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "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 OR ITS 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 "JSActivation.h"
#include "Arguments.h"
#include "Interpreter.h"
#include "JSFunction.h"
namespace JSC {
ASSERT_CLASS_FITS_IN_CELL(JSActivation);
const ClassInfo JSActivation::info = { "JSActivation", 0, 0, 0 };
JSActivation::JSActivation(CallFrame* callFrame, PassRefPtr<FunctionBodyNode> functionBody)
: Base(callFrame->globalData().activationStructure, new JSActivationData(functionBody, callFrame->registers()))
{
}
JSActivation::~JSActivation()
{
delete d();
}
void JSActivation::mark()
{
Base::mark();
Register* registerArray = d()->registerArray.get();
if (!registerArray)
return;
size_t numParametersMinusThis = d()->functionBody->generatedBytecode().m_numParameters - 1;
size_t i = 0;
size_t count = numParametersMinusThis;
for ( ; i < count; ++i) {
Register& r = registerArray[i];
if (!r.marked())
r.mark();
}
size_t numVars = d()->functionBody->generatedBytecode().m_numVars;
// Skip the call frame, which sits between the parameters and vars.
i += RegisterFile::CallFrameHeaderSize;
count += RegisterFile::CallFrameHeaderSize + numVars;
for ( ; i < count; ++i) {
Register& r = registerArray[i];
if (r.jsValue() && !r.marked())
r.mark();
}
}
bool JSActivation::getOwnPropertySlot(ExecState* exec, const Identifier& propertyName, PropertySlot& slot)
{
if (symbolTableGet(propertyName, slot))
return true;
if (JSValue* location = getDirectLocation(propertyName)) {
slot.setValueSlot(location);
return true;
}
// Only return the built-in arguments object if it wasn't overridden above.
if (propertyName == exec->propertyNames().arguments) {
slot.setCustom(this, getArgumentsGetter());
return true;
}
// We don't call through to JSObject because there's no way to give an
// activation object getter properties or a prototype.
ASSERT(!hasGetterSetterProperties());
ASSERT(prototype().isNull());
return false;
}
void JSActivation::put(ExecState*, const Identifier& propertyName, JSValue value, PutPropertySlot& slot)
{
ASSERT(!Heap::heap(value) || Heap::heap(value) == Heap::heap(this));
if (symbolTablePut(propertyName, value))
return;
// We don't call through to JSObject because __proto__ and getter/setter
// properties are non-standard extensions that other implementations do not
// expose in the activation object.
ASSERT(!hasGetterSetterProperties());
putDirect(propertyName, value, 0, true, slot);
}
// FIXME: Make this function honor ReadOnly (const) and DontEnum
void JSActivation::putWithAttributes(ExecState* exec, const Identifier& propertyName, JSValue value, unsigned attributes)
{
ASSERT(!Heap::heap(value) || Heap::heap(value) == Heap::heap(this));
if (symbolTablePutWithAttributes(propertyName, value, attributes))
return;
// We don't call through to JSObject because __proto__ and getter/setter
// properties are non-standard extensions that other implementations do not
// expose in the activation object.
ASSERT(!hasGetterSetterProperties());
PutPropertySlot slot;
JSObject::putWithAttributes(exec, propertyName, value, attributes, true, slot);
}
bool JSActivation::deleteProperty(ExecState* exec, const Identifier& propertyName)
{
if (propertyName == exec->propertyNames().arguments)
return false;
return Base::deleteProperty(exec, propertyName);
}
JSObject* JSActivation::toThisObject(ExecState* exec) const
{
return exec->globalThisValue();
}
bool JSActivation::isDynamicScope() const
{
return d()->functionBody->usesEval();
}
JSValue JSActivation::argumentsGetter(ExecState* exec, const Identifier&, const PropertySlot& slot)
{
JSActivation* activation = asActivation(slot.slotBase());
if (activation->d()->functionBody->usesArguments()) {
PropertySlot slot;
activation->symbolTableGet(exec->propertyNames().arguments, slot);
return slot.getValue(exec, exec->propertyNames().arguments);
}
CallFrame* callFrame = CallFrame::create(activation->d()->registers);
Arguments* arguments = callFrame->optionalCalleeArguments();
if (!arguments) {
arguments = new (callFrame) Arguments(callFrame);
arguments->copyRegisters();
callFrame->setCalleeArguments(arguments);
}
ASSERT(arguments->isObject(&Arguments::info));
return arguments;
}
// These two functions serve the purpose of isolating the common case from a
// PIC branch.
PropertySlot::GetValueFunc JSActivation::getArgumentsGetter()
{
return argumentsGetter;
}
} // namespace JSC
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