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/*
* Copyright (C) 2016-2021 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 "JSGlobalObject.h"
#include "SlotVisitor.h"
#include "WriteBarrier.h"
namespace JSC {
class InternalFunctionAllocationProfile {
public:
static constexpr ptrdiff_t offsetOfStructureID() { return OBJECT_OFFSETOF(InternalFunctionAllocationProfile, m_structureID); }
Structure* structure() { return m_structureID.get(); }
Structure* createAllocationStructureFromBase(VM&, JSGlobalObject*, JSCell* owner, JSObject* prototype, Structure* base, InlineWatchpointSet&);
void clear() { m_structureID.clear(); }
template<typename Visitor> void visitAggregate(Visitor& visitor) { visitor.append(m_structureID); }
private:
WriteBarrierStructureID m_structureID;
};
inline Structure* InternalFunctionAllocationProfile::createAllocationStructureFromBase(VM& vm, JSGlobalObject* baseGlobalObject, JSCell* owner, JSObject* prototype, Structure* baseStructure, InlineWatchpointSet& watchpointSet)
{
ASSERT(!m_structureID || m_structureID.get()->classInfoForCells() != baseStructure->classInfoForCells() || m_structureID->globalObject() != baseStructure->globalObject());
ASSERT(baseStructure->hasMonoProto());
Structure* structure;
// FIXME: Implement polymorphic prototypes for subclasses of builtin types:
// https://bugs.webkit.org/show_bug.cgi?id=177318
if (prototype == baseStructure->storedPrototype())
structure = baseStructure;
else
structure = baseGlobalObject->structureCache().emptyStructureForPrototypeFromBaseStructure(baseGlobalObject, prototype, baseStructure);
// Ensure that if another thread sees the structure, it will see it properly created.
WTF::storeStoreFence();
// It's possible to get here because some JSFunction got passed to two different InternalFunctions. e.g.
// function Foo() { }
// Reflect.construct(Promise, [], Foo);
// Reflect.construct(Int8Array, [], Foo);
if (UNLIKELY(m_structureID && m_structureID.value() != structure->id()))
watchpointSet.fireAll(vm, "InternalFunctionAllocationProfile rotated to a new structure");
m_structureID.set(vm, owner, structure);
return structure;
}
} // namespace JSC
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