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/*
* Copyright (C) 2013 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 INC. OR
* 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 "JSArrayIterator.h"
#include "JSCJSValueInlines.h"
#include "JSCellInlines.h"
#include "SlotVisitorInlines.h"
#include "StructureInlines.h"
namespace JSC {
const ClassInfo JSArrayIterator::s_info = { "ArrayIterator", &Base::s_info, 0, CREATE_METHOD_TABLE(JSArrayIterator) };
static EncodedJSValue JSC_HOST_CALL arrayIteratorNextKey(ExecState*);
static EncodedJSValue JSC_HOST_CALL arrayIteratorNextValue(ExecState*);
static EncodedJSValue JSC_HOST_CALL arrayIteratorNextGeneric(ExecState*);
void JSArrayIterator::finishCreation(VM& vm, JSGlobalObject* globalObject, ArrayIterationKind kind, JSObject* iteratedObject)
{
Base::finishCreation(vm);
ASSERT(inherits(info()));
m_iterationKind = kind;
m_iteratedObject.set(vm, this, iteratedObject);
switch (kind) {
case ArrayIterateKey:
JSC_NATIVE_INTRINSIC_FUNCTION(vm.propertyNames->iteratorNextPrivateName, arrayIteratorNextKey, DontEnum, 0, ArrayIteratorNextKeyIntrinsic);
break;
case ArrayIterateValue:
JSC_NATIVE_INTRINSIC_FUNCTION(vm.propertyNames->iteratorNextPrivateName, arrayIteratorNextValue, DontEnum, 0, ArrayIteratorNextValueIntrinsic);
break;
default:
JSC_NATIVE_INTRINSIC_FUNCTION(vm.propertyNames->iteratorNextPrivateName, arrayIteratorNextGeneric, DontEnum, 0, ArrayIteratorNextGenericIntrinsic);
break;
}
}
void JSArrayIterator::visitChildren(JSCell* cell, SlotVisitor& visitor)
{
JSArrayIterator* thisObject = jsCast<JSArrayIterator*>(cell);
ASSERT_GC_OBJECT_INHERITS(thisObject, info());
Base::visitChildren(thisObject, visitor);
visitor.append(&thisObject->m_iteratedObject);
}
static EncodedJSValue createIteratorResult(CallFrame* callFrame, ArrayIterationKind kind, size_t index, JSValue result, bool done)
{
if (done)
return JSValue::encode(callFrame->vm().iterationTerminator.get());
switch (kind & ~ArrayIterateSparseTag) {
case ArrayIterateKey:
return JSValue::encode(jsNumber(index));
case ArrayIterateValue:
return JSValue::encode(result);
case ArrayIterateKeyValue: {
MarkedArgumentBuffer args;
args.append(jsNumber(index));
args.append(result);
JSGlobalObject* globalObject = callFrame->callee()->globalObject();
return JSValue::encode(constructArray(callFrame, 0, globalObject, args));
}
default:
RELEASE_ASSERT_NOT_REACHED();
}
return JSValue::encode(JSValue());
}
static inline EncodedJSValue JSC_HOST_CALL arrayIteratorNext(CallFrame* callFrame)
{
JSArrayIterator* iterator = jsDynamicCast<JSArrayIterator*>(callFrame->thisValue());
if (!iterator) {
ASSERT_NOT_REACHED();
return JSValue::encode(throwTypeError(callFrame, ASCIILiteral("Cannot call ArrayIterator.next() on a non-ArrayIterator object")));
}
JSObject* iteratedObject = iterator->iteratedObject();
size_t index = iterator->nextIndex();
ArrayIterationKind kind = iterator->iterationKind();
JSValue jsLength = JSValue(iteratedObject).get(callFrame, callFrame->propertyNames().length);
if (callFrame->hadException())
return JSValue::encode(jsNull());
size_t length = jsLength.toUInt32(callFrame);
if (callFrame->hadException())
return JSValue::encode(jsNull());
if (index >= length) {
iterator->finish();
return createIteratorResult(callFrame, kind, index, jsUndefined(), true);
}
if (JSValue result = iteratedObject->tryGetIndexQuickly(index)) {
iterator->setNextIndex(index + 1);
return createIteratorResult(callFrame, kind, index, result, false);
}
JSValue result = jsUndefined();
PropertySlot slot(iteratedObject);
if (kind > ArrayIterateSparseTag) {
// We assume that the indexed property will be an own property so cache the getOwnProperty
// method locally
auto getOwnPropertySlotByIndex = iteratedObject->methodTable()->getOwnPropertySlotByIndex;
while (index < length) {
if (getOwnPropertySlotByIndex(iteratedObject, callFrame, index, slot)) {
result = slot.getValue(callFrame, index);
break;
}
if (iteratedObject->getPropertySlot(callFrame, index, slot)) {
result = slot.getValue(callFrame, index);
break;
}
index++;
}
} else if (iteratedObject->getPropertySlot(callFrame, index, slot))
result = slot.getValue(callFrame, index);
if (index == length)
iterator->finish();
else
iterator->setNextIndex(index + 1);
return createIteratorResult(callFrame, kind, index, jsUndefined(), index == length);
}
EncodedJSValue JSC_HOST_CALL arrayIteratorNextKey(CallFrame* callFrame)
{
return arrayIteratorNext(callFrame);
}
EncodedJSValue JSC_HOST_CALL arrayIteratorNextValue(CallFrame* callFrame)
{
return arrayIteratorNext(callFrame);
}
EncodedJSValue JSC_HOST_CALL arrayIteratorNextGeneric(CallFrame* callFrame)
{
return arrayIteratorNext(callFrame);
}
}
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