mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
synced 2025-04-11 11:20:43 +00:00
95 lines
4.6 KiB
C++
95 lines
4.6 KiB
C++
/*
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* Copyright (C) 2013-2019 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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#include "config.h"
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#include "StructureCache.h"
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#include "JSCInlines.h"
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#include <wtf/Locker.h>
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namespace JSC {
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inline Structure* StructureCache::createEmptyStructure(JSGlobalObject* globalObject, JSObject* prototype, const TypeInfo& typeInfo, const ClassInfo* classInfo, IndexingType indexingType, unsigned inlineCapacity, bool makePolyProtoStructure, FunctionExecutable* executable)
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{
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RELEASE_ASSERT(!!prototype); // We use nullptr inside the HashMap for prototype to mean poly proto, so user's of this API must provide non-null prototypes.
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// We don't need to lock here because only the main thread can get here, and only the main thread can mutate the cache
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PrototypeKey key { makePolyProtoStructure ? nullptr : prototype, executable, inlineCapacity, classInfo, globalObject };
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if (Structure* structure = m_structures.get(key)) {
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if (makePolyProtoStructure) {
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prototype->didBecomePrototype();
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RELEASE_ASSERT(structure->hasPolyProto());
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} else
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RELEASE_ASSERT(structure->hasMonoProto());
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ASSERT(prototype->mayBePrototype());
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return structure;
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}
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prototype->didBecomePrototype();
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VM& vm = globalObject->vm();
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Structure* structure;
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if (makePolyProtoStructure) {
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structure = Structure::create(
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Structure::PolyProto, vm, globalObject, prototype, typeInfo, classInfo, indexingType, inlineCapacity);
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} else {
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structure = Structure::create(
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vm, globalObject, prototype, typeInfo, classInfo, indexingType, inlineCapacity);
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}
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auto locker = holdLock(m_lock);
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m_structures.set(key, structure);
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return structure;
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}
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Structure* StructureCache::emptyObjectStructureConcurrently(JSGlobalObject* globalObject, JSObject* prototype, unsigned inlineCapacity)
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{
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RELEASE_ASSERT(!!prototype); // We use nullptr inside the HashMap for prototype to mean poly proto, so user's of this API must provide non-null prototypes.
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PrototypeKey key { prototype, nullptr, inlineCapacity, JSFinalObject::info(), globalObject };
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auto locker = holdLock(m_lock);
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if (Structure* structure = m_structures.get(key)) {
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ASSERT(prototype->mayBePrototype());
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return structure;
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}
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return nullptr;
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}
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Structure* StructureCache::emptyStructureForPrototypeFromBaseStructure(JSGlobalObject* globalObject, JSObject* prototype, Structure* baseStructure)
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{
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// We currently do not have inline capacity static analysis for subclasses and all internal function constructors have a default inline capacity of 0.
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IndexingType indexingType = baseStructure->indexingType();
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if (prototype->anyObjectInChainMayInterceptIndexedAccesses(globalObject->vm()) && hasIndexedProperties(indexingType))
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indexingType = (indexingType & ~IndexingShapeMask) | SlowPutArrayStorageShape;
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return createEmptyStructure(globalObject, prototype, baseStructure->typeInfo(), baseStructure->classInfo(), indexingType, 0, false, nullptr);
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}
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Structure* StructureCache::emptyObjectStructureForPrototype(JSGlobalObject* globalObject, JSObject* prototype, unsigned inlineCapacity, bool makePolyProtoStructure, FunctionExecutable* executable)
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{
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return createEmptyStructure(globalObject, prototype, JSFinalObject::typeInfo(), JSFinalObject::info(), JSFinalObject::defaultIndexingType, inlineCapacity, makePolyProtoStructure, executable);
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}
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} // namespace JSC
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