mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
synced 2025-02-17 02:18:14 +00:00
121 lines
4.1 KiB
C++
121 lines
4.1 KiB
C++
/*
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* Copyright (C) 2013, 2016 Apple, Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include "IterationKind.h"
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#include "JSMap.h"
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#include "JSObject.h"
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namespace JSC {
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// Now, it is only used for serialization.
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class JSMapIterator final : public JSCell {
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typedef HashMapBucket<HashMapBucketDataKeyValue> HashMapBucketType;
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public:
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using Base = JSCell;
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DECLARE_EXPORT_INFO;
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static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
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{
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return Structure::create(vm, globalObject, prototype, TypeInfo(ObjectType, StructureFlags), info());
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}
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static JSMapIterator* create(VM& vm, Structure* structure, JSMap* iteratedObject, IterationKind kind)
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{
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JSMapIterator* instance = new (NotNull, allocateCell<JSMapIterator>(vm.heap)) JSMapIterator(vm, structure, iteratedObject, kind);
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instance->finishCreation(vm, iteratedObject);
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return instance;
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}
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ALWAYS_INLINE HashMapBucketType* advanceIter(ExecState* exec)
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{
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HashMapBucketType* prev = m_iter.get();
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if (!prev)
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return nullptr;
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VM& vm = exec->vm();
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HashMapBucketType* bucket = m_iter->next();
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while (bucket && bucket->deleted())
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bucket = bucket->next();
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if (!bucket) {
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setIterator(vm, nullptr);
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return nullptr;
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}
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setIterator(vm, bucket); // We keep m_iter on the last value since the first thing we do in this function is call next().
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return bucket;
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}
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bool next(ExecState* exec, JSValue& value)
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{
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HashMapBucketType* bucket = advanceIter(exec);
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if (!bucket)
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return false;
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if (m_kind == IterateValue)
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value = bucket->value();
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else if (m_kind == IterateKey)
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value = bucket->key();
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else
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value = createPair(exec, bucket->key(), bucket->value());
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return true;
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}
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bool nextKeyValue(ExecState* exec, JSValue& key, JSValue& value)
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{
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HashMapBucketType* bucket = advanceIter(exec);
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if (!bucket)
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return false;
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key = bucket->key();
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value = bucket->value();
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return true;
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}
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IterationKind kind() const { return m_kind; }
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JSValue iteratedValue() const { return m_map.get(); }
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private:
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JSMapIterator(VM& vm, Structure* structure, JSMap*, IterationKind kind)
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: Base(vm, structure)
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, m_kind(kind)
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{ }
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void setIterator(VM& vm, HashMapBucketType* bucket)
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{
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m_iter.setMayBeNull(vm, this, bucket);
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}
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JS_EXPORT_PRIVATE void finishCreation(VM&, JSMap*);
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JSValue createPair(CallFrame*, JSValue, JSValue);
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static void visitChildren(JSCell*, SlotVisitor&);
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WriteBarrier<JSMap> m_map;
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WriteBarrier<HashMapBucketType> m_iter;
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IterationKind m_kind;
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};
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STATIC_ASSERT_IS_TRIVIALLY_DESTRUCTIBLE(JSMapIterator);
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} // namespace JSC
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