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