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/*
* Copyright (C) 2013, 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 "IterationKind.h"
#include "JSInternalFieldObjectImpl.h"
#include "JSMap.h"
namespace JSC {
class JSMapIterator final : public JSInternalFieldObjectImpl<3> {
public:
using HashMapBucketType = HashMapBucket<HashMapBucketDataKeyValue>;
using Base = JSInternalFieldObjectImpl<3>;
DECLARE_EXPORT_INFO;
enum class Field : uint8_t {
MapBucket = 0,
IteratedObject,
Kind,
};
static_assert(numberOfInternalFields == 3);
static std::array<JSValue, numberOfInternalFields> initialValues()
{
return { {
jsNull(),
jsNull(),
jsNumber(0),
} };
}
const WriteBarrier<Unknown>& internalField(Field field) const { return Base::internalField(static_cast<uint32_t>(field)); }
WriteBarrier<Unknown>& internalField(Field field) { return Base::internalField(static_cast<uint32_t>(field)); }
template<typename CellType, SubspaceAccess mode>
static IsoSubspace* subspaceFor(VM& vm)
{
return vm.mapIteratorSpace<mode>();
}
static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
{
return Structure::create(vm, globalObject, prototype, TypeInfo(JSMapIteratorType, StructureFlags), info());
}
static JSMapIterator* create(VM& vm, Structure* structure, JSMap* iteratedObject, IterationKind kind)
{
JSMapIterator* instance = new (NotNull, allocateCell<JSMapIterator>(vm.heap)) JSMapIterator(vm, structure);
instance->finishCreation(vm, iteratedObject, kind);
return instance;
}
static JSMapIterator* createWithInitialValues(VM&, Structure*);
ALWAYS_INLINE HashMapBucketType* advanceIter(VM& vm)
{
HashMapBucketType* prev = iterator();
HashMapBucketType* sentinel = jsCast<HashMapBucketType*>(vm.sentinelMapBucket());
if (prev == sentinel)
return nullptr;
HashMapBucketType* bucket = prev->next();
while (bucket && bucket->deleted())
bucket = bucket->next();
if (!bucket) {
setIterator(vm, sentinel);
return nullptr;
}
setIterator(vm, bucket); // We keep iterator on the last value since the first thing we do in this function is call next().
return bucket;
}
bool next(JSGlobalObject* globalObject, JSValue& value)
{
HashMapBucketType* bucket = advanceIter(getVM(globalObject));
if (!bucket)
return false;
switch (kind()) {
case IterationKind::Values:
value = bucket->value();
break;
case IterationKind::Keys:
value = bucket->key();
break;
case IterationKind::Entries:
value = createPair(globalObject, bucket->key(), bucket->value());
break;
}
return true;
}
bool nextKeyValue(JSGlobalObject* globalObject, JSValue& key, JSValue& value)
{
HashMapBucketType* bucket = advanceIter(getVM(globalObject));
if (!bucket)
return false;
key = bucket->key();
value = bucket->value();
return true;
}
IterationKind kind() const { return static_cast<IterationKind>(internalField(Field::Kind).get().asUInt32AsAnyInt()); }
JSObject* iteratedObject() const { return jsCast<JSObject*>(internalField(Field::IteratedObject).get()); }
HashMapBucketType* iterator() const { return jsCast<HashMapBucketType*>(internalField(Field::MapBucket).get()); }
private:
JSMapIterator(VM& vm, Structure* structure)
: Base(vm, structure)
{ }
void setIterator(VM& vm, HashMapBucketType* bucket)
{
internalField(Field::MapBucket).set(vm, this, bucket);
}
JS_EXPORT_PRIVATE void finishCreation(VM&, JSMap*, IterationKind);
void finishCreation(VM&);
JSValue createPair(JSGlobalObject*, JSValue, JSValue);
static void visitChildren(JSCell*, SlotVisitor&);
};
STATIC_ASSERT_IS_TRIVIALLY_DESTRUCTIBLE(JSMapIterator);
} // namespace JSC