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/*
* Copyright (C) 2015 Yusuke Suzuki <utatane.tea@gmail.com>.
* Copyright (C) 2016 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.
*/
#pragma once
#include "IterationModeMetadata.h"
#include "JSArrayIterator.h"
#include "JSCJSValue.h"
#include "JSObjectInlines.h"
#include "ThrowScope.h"
namespace JSC {
struct IterationRecord {
JSValue iterator;
JSValue nextMethod;
};
JSValue iteratorNext(JSGlobalObject*, IterationRecord, JSValue argument = JSValue());
JS_EXPORT_PRIVATE JSValue iteratorValue(JSGlobalObject*, JSValue iterResult);
bool iteratorComplete(JSGlobalObject*, JSValue iterResult);
JS_EXPORT_PRIVATE JSValue iteratorStep(JSGlobalObject*, IterationRecord);
JS_EXPORT_PRIVATE void iteratorClose(JSGlobalObject*, JSValue iterator);
JS_EXPORT_PRIVATE JSObject* createIteratorResultObject(JSGlobalObject*, JSValue, bool done);
Structure* createIteratorResultObjectStructure(VM&, JSGlobalObject&);
JS_EXPORT_PRIVATE JSValue iteratorMethod(JSGlobalObject*, JSObject*);
JS_EXPORT_PRIVATE IterationRecord iteratorForIterable(JSGlobalObject*, JSObject*, JSValue iteratorMethod);
JS_EXPORT_PRIVATE IterationRecord iteratorForIterable(JSGlobalObject*, JSValue iterable);
JS_EXPORT_PRIVATE IterationRecord iteratorDirect(JSGlobalObject*, JSValue);
JS_EXPORT_PRIVATE JSValue iteratorMethod(JSGlobalObject*, JSObject*);
JS_EXPORT_PRIVATE bool hasIteratorMethod(JSGlobalObject*, JSValue);
JS_EXPORT_PRIVATE IterationMode getIterationMode(VM&, JSGlobalObject*, JSValue iterable);
JS_EXPORT_PRIVATE IterationMode getIterationMode(VM&, JSGlobalObject*, JSValue iterable, JSValue symbolIterator);
template<typename CallBackType>
static ALWAYS_INLINE void forEachInFastArray(JSGlobalObject* globalObject, JSValue iterable, JSArray* array, const CallBackType& callback)
{
UNUSED_PARAM(iterable);
auto& vm = getVM(globalObject);
ASSERT(getIterationMode(vm, globalObject, iterable) == IterationMode::FastArray);
auto scope = DECLARE_THROW_SCOPE(vm);
for (unsigned index = 0; index < array->length(); ++index) {
JSValue nextValue = array->getIndex(globalObject, index);
RETURN_IF_EXCEPTION(scope, void());
callback(vm, globalObject, nextValue);
if (UNLIKELY(scope.exception())) {
scope.release();
JSArrayIterator* iterator = JSArrayIterator::create(vm, globalObject->arrayIteratorStructure(), array, IterationKind::Values);
iterator->internalField(JSArrayIterator::Field::Index).setWithoutWriteBarrier(jsNumber(index + 1));
iteratorClose(globalObject, iterator);
return;
}
}
}
template<typename CallBackType>
static ALWAYS_INLINE void forEachInIterationRecord(JSGlobalObject* globalObject, IterationRecord iterationRecord, const CallBackType& callback)
{
auto& vm = getVM(globalObject);
auto scope = DECLARE_THROW_SCOPE(vm);
while (true) {
JSValue next = iteratorStep(globalObject, iterationRecord);
if (UNLIKELY(scope.exception()) || next.isFalse())
return;
JSValue nextValue = iteratorValue(globalObject, next);
RETURN_IF_EXCEPTION(scope, void());
callback(vm, globalObject, nextValue);
if (UNLIKELY(scope.exception())) {
scope.release();
iteratorClose(globalObject, iterationRecord.iterator);
return;
}
}
}
template<typename CallBackType>
void forEachInIterable(JSGlobalObject* globalObject, JSValue iterable, const CallBackType& callback)
{
auto& vm = getVM(globalObject);
auto scope = DECLARE_THROW_SCOPE(vm);
if (getIterationMode(vm, globalObject, iterable) == IterationMode::FastArray) {
auto* array = jsCast<JSArray*>(iterable);
forEachInFastArray(globalObject, iterable, array, callback);
RETURN_IF_EXCEPTION(scope, void());
return;
}
IterationRecord iterationRecord = iteratorForIterable(globalObject, iterable);
RETURN_IF_EXCEPTION(scope, void());
scope.release();
forEachInIterationRecord(globalObject, iterationRecord, callback);
}
template<typename CallBackType>
void forEachInIterable(JSGlobalObject& globalObject, JSObject* iterable, JSValue iteratorMethod, const CallBackType& callback)
{
auto& vm = getVM(&globalObject);
auto scope = DECLARE_THROW_SCOPE(vm);
if (getIterationMode(vm, &globalObject, iterable, iteratorMethod) == IterationMode::FastArray) {
auto* array = jsCast<JSArray*>(iterable);
for (unsigned index = 0; index < array->length(); ++index) {
JSValue nextValue = array->getIndex(&globalObject, index);
RETURN_IF_EXCEPTION(scope, void());
callback(vm, globalObject, nextValue);
if (UNLIKELY(scope.exception())) {
scope.release();
JSArrayIterator* iterator = JSArrayIterator::create(vm, globalObject.arrayIteratorStructure(), array, IterationKind::Values);
iterator->internalField(JSArrayIterator::Field::Index).setWithoutWriteBarrier(jsNumber(index + 1));
iteratorClose(&globalObject, iterator);
return;
}
}
return;
}
auto iterationRecord = iteratorForIterable(&globalObject, iterable, iteratorMethod);
RETURN_IF_EXCEPTION(scope, void());
while (true) {
JSValue next = iteratorStep(&globalObject, iterationRecord);
if (UNLIKELY(scope.exception()) || next.isFalse())
return;
JSValue nextValue = iteratorValue(&globalObject, next);
RETURN_IF_EXCEPTION(scope, void());
callback(vm, globalObject, nextValue);
if (UNLIKELY(scope.exception())) {
scope.release();
iteratorClose(&globalObject, iterationRecord.iterator);
return;
}
}
}
template<typename CallBackType>
void forEachInIteratorProtocol(JSGlobalObject* globalObject, JSValue iterable, const CallBackType& callback)
{
auto& vm = getVM(globalObject);
auto scope = DECLARE_THROW_SCOPE(vm);
IterationRecord iterationRecord = iteratorDirect(globalObject, iterable);
RETURN_IF_EXCEPTION(scope, void());
scope.release();
forEachInIterationRecord(globalObject, iterationRecord, callback);
}
} // namespace JSC
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