blob: d62d1060ed64eac282f06cfe25c6913291efcc63 [file] [log] [blame]
/*
* Copyright (C) 2008 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 "JSCast.h"
#include "JSObject.h"
#include "Structure.h"
#include <wtf/StdLibExtras.h>
#include <wtf/UniqueArray.h>
namespace JSC {
class LLIntOffsetsExtractor;
class Structure;
class StructureChain final : public JSCell {
friend class JIT;
public:
typedef JSCell Base;
static const unsigned StructureFlags = Base::StructureFlags | StructureIsImmortal;
static StructureChain* create(VM& vm, JSObject* head)
{
StructureChain* chain = new (NotNull, allocateCell<StructureChain>(vm.heap)) StructureChain(vm, vm.structureChainStructure.get());
chain->finishCreation(vm, head);
return chain;
}
WriteBarrier<Structure>* head() { return m_vector.get(); }
static void visitChildren(JSCell*, SlotVisitor&);
static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
{
return Structure::create(vm, globalObject, prototype, TypeInfo(CellType, StructureFlags), info());
}
DECLARE_INFO;
static const bool needsDestruction = true;
static void destroy(JSCell*);
protected:
void finishCreation(VM& vm, JSObject* head)
{
Base::finishCreation(vm);
size_t size = 0;
for (JSObject* current = head; current; current = current->structure(vm)->storedPrototypeObject(current))
++size;
auto vector = makeUniqueArray<WriteBarrier<Structure>>(size + 1);
size_t i = 0;
for (JSObject* current = head; current; current = current->structure(vm)->storedPrototypeObject(current))
vector[i++].set(vm, this, current->structure(vm));
vm.heap.mutatorFence();
m_vector = WTFMove(vector);
vm.heap.writeBarrier(this);
}
private:
friend class LLIntOffsetsExtractor;
StructureChain(VM&, Structure*);
UniqueArray<WriteBarrier<Structure>> m_vector;
};
} // namespace JSC