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/*
* Copyright (C) 2013-2021 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 "VM.h"
#include "ObjectPrototype.h"
#include "SlotVisitor.h"
#include "WriteBarrier.h"
namespace JSC {
class FunctionRareData;
template<typename Derived>
class ObjectAllocationProfileBase {
friend class LLIntOffsetsExtractor;
public:
static constexpr ptrdiff_t offsetOfAllocator() { return OBJECT_OFFSETOF(ObjectAllocationProfileBase, m_allocator); }
static constexpr ptrdiff_t offsetOfStructure() { return OBJECT_OFFSETOF(ObjectAllocationProfileBase, m_structure); }
ObjectAllocationProfileBase() = default;
bool isNull() { return !m_structure; }
void initializeProfile(VM&, JSGlobalObject*, JSCell* owner, JSObject* prototype, unsigned inferredInlineCapacity, JSFunction* constructor = nullptr, FunctionRareData* = nullptr);
Structure* structure()
{
Structure* structure = m_structure.get();
// Ensure that if we see the structure, it has been properly created
WTF::dependentLoadLoadFence();
return structure;
}
protected:
void clear()
{
m_allocator = Allocator();
m_structure.clear();
ASSERT(isNull());
}
template<typename Visitor>
void visitAggregate(Visitor& visitor)
{
visitor.append(m_structure);
}
private:
unsigned possibleDefaultPropertyCount(VM&, JSObject* prototype);
Allocator m_allocator; // Precomputed to make things easier for generated code.
WriteBarrier<Structure> m_structure;
};
class ObjectAllocationProfile : public ObjectAllocationProfileBase<ObjectAllocationProfile> {
public:
using Base = ObjectAllocationProfileBase<ObjectAllocationProfile>;
ObjectAllocationProfile() = default;
using Base::clear;
using Base::visitAggregate;
void setPrototype(VM&, JSCell*, JSObject*) { }
};
class ObjectAllocationProfileWithPrototype : public ObjectAllocationProfileBase<ObjectAllocationProfileWithPrototype> {
public:
using Base = ObjectAllocationProfileBase<ObjectAllocationProfileWithPrototype>;
static constexpr ptrdiff_t offsetOfPrototype() { return OBJECT_OFFSETOF(ObjectAllocationProfileWithPrototype, m_prototype); }
ObjectAllocationProfileWithPrototype() = default;
JSObject* prototype()
{
JSObject* prototype = m_prototype.get();
WTF::dependentLoadLoadFence();
return prototype;
}
void clear()
{
Base::clear();
m_prototype.clear();
ASSERT(isNull());
}
template<typename Visitor>
void visitAggregate(Visitor& visitor)
{
Base::visitAggregate(visitor);
visitor.append(m_prototype);
}
void setPrototype(VM& vm, JSCell* owner, JSObject* object)
{
m_prototype.set(vm, owner, object);
}
private:
WriteBarrier<JSObject> m_prototype;
};
} // namespace JSC
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