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/*
* Copyright (C) 2013-2024 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 {
const static uint8_t JSMapIteratorNumberOFInternalFields = 4;
class JSMapIterator final : public JSInternalFieldObjectImpl<JSMapIteratorNumberOFInternalFields> {
public:
using Base = JSInternalFieldObjectImpl<JSMapIteratorNumberOFInternalFields>;
DECLARE_EXPORT_INFO;
enum class Field : uint8_t {
Entry = 0,
IteratedObject,
Storage,
Kind,
};
static_assert(numberOfInternalFields == JSMapIteratorNumberOFInternalFields);
static std::array<JSValue, numberOfInternalFields> initialValues()
{
return { {
jsNumber(0),
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 GCClient::IsoSubspace* subspaceFor(VM& vm)
{
return vm.mapIteratorSpace<mode>();
}
inline static Structure* createStructure(VM&, JSGlobalObject*, JSValue);
static JSMapIterator* create(JSGlobalObject* globalObject, Structure* structure, JSMap* iteratedObject, IterationKind kind)
{
VM& vm = getVM(globalObject);
JSMapIterator* instance = new (NotNull, allocateCell<JSMapIterator>(vm)) JSMapIterator(vm, structure);
instance->finishCreation(globalObject, iteratedObject, kind);
return instance;
}
static JSMapIterator* createWithInitialValues(VM&, Structure*);
struct NextResult {
JSValue key;
JSValue value;
};
ALWAYS_INLINE NextResult nextWithAdvance(VM& vm)
{
JSCell* storage = this->storage();
JSCell* sentinel = vm.orderedHashTableSentinel();
if (storage == sentinel)
return { };
JSMap::Storage& storageRef = *jsCast<JSMap::Storage*>(storage);
auto result = JSMap::Helper::transitAndNext(vm, storageRef, entry());
if (!result.storage) {
setStorage(vm, sentinel);
return { };
}
setEntry(vm, result.entry + 1);
if (result.storage != storage)
setStorage(vm, result.storage);
return { result.key, result.value };
}
bool next(JSGlobalObject* globalObject, JSValue& value)
{
auto result = nextWithAdvance(globalObject->vm());
if (result.key.isEmpty())
return false;
switch (kind()) {
case IterationKind::Values:
value = result.value;
break;
case IterationKind::Keys:
value = result.key;
break;
case IterationKind::Entries:
value = createTuple(globalObject, result.key, result.value);
break;
}
return true;
}
bool nextKeyValue(JSGlobalObject* globalObject, JSValue& key, JSValue& value)
{
auto result = nextWithAdvance(globalObject->vm());
if (result.key.isEmpty())
return false;
key = result.key;
value = result.value;
return true;
}
JSValue next(VM& vm)
{
auto result = nextWithAdvance(vm);
return result.key.isEmpty() ? jsBoolean(true) : jsBoolean(false);
}
JSValue nextKey(VM& vm)
{
JSMap::Helper::Entry entry = this->entry() - 1;
JSCell* storage = this->storage();
ASSERT_UNUSED(vm, storage != vm.orderedHashTableSentinel());
JSMap::Storage& storageRef = *jsCast<JSMap::Storage*>(storage);
return JSMap::Helper::getKey(storageRef, entry);
}
JSValue nextValue(VM& vm)
{
JSMap::Helper::Entry entry = this->entry() - 1;
JSCell* storage = this->storage();
ASSERT_UNUSED(vm, storage != vm.orderedHashTableSentinel());
JSMap::Storage& storageRef = *jsCast<JSMap::Storage*>(storage);
return JSMap::Helper::getValue(storageRef, entry);
}
IterationKind kind() const { return static_cast<IterationKind>(internalField(Field::Kind).get().asUInt32AsAnyInt()); }
JSObject* iteratedObject() const { return jsCast<JSObject*>(internalField(Field::IteratedObject).get()); }
JSCell* storage() const { return internalField(Field::Storage).get().asCell(); }
JSMap::Helper::Entry entry() const { return JSMap::Helper::toNumber(internalField(Field::Entry).get()); }
void setIteratedObject(VM& vm, JSMap* map) { internalField(Field::IteratedObject).set(vm, this, map); }
void setStorage(VM& vm, JSCell* storage) { internalField(Field::Storage).set(vm, this, storage); }
void setEntry(VM& vm, JSMap::Helper::Entry entry) { internalField(Field::Entry).set(vm, this, JSMap::Helper::toJSValue(entry)); }
private:
JSMapIterator(VM& vm, Structure* structure)
: Base(vm, structure)
{
}
JS_EXPORT_PRIVATE void finishCreation(JSGlobalObject*, JSMap*, IterationKind);
void finishCreation(VM&);
DECLARE_VISIT_CHILDREN;
};
STATIC_ASSERT_IS_TRIVIALLY_DESTRUCTIBLE(JSMapIterator);
JSC_DECLARE_HOST_FUNCTION(mapIteratorPrivateFuncMapIteratorNext);
JSC_DECLARE_HOST_FUNCTION(mapIteratorPrivateFuncMapIteratorKey);
JSC_DECLARE_HOST_FUNCTION(mapIteratorPrivateFuncMapIteratorValue);
} // namespace JSC
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