/* * Copyright (C) 2013-2017 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 "JSGlobalObject.h" #include "ObjectPrototype.h" #include "SlotVisitor.h" #include "WriteBarrier.h" namespace JSC { class FunctionRareData; class ObjectAllocationProfile { friend class LLIntOffsetsExtractor; public: static ptrdiff_t offsetOfAllocator() { return OBJECT_OFFSETOF(ObjectAllocationProfile, m_allocator); } static ptrdiff_t offsetOfStructure() { return OBJECT_OFFSETOF(ObjectAllocationProfile, m_structure); } static ptrdiff_t offsetOfInlineCapacity() { return OBJECT_OFFSETOF(ObjectAllocationProfile, m_inlineCapacity); } ObjectAllocationProfile() : m_inlineCapacity(0) { } 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::loadLoadFence(); return structure; } unsigned inlineCapacity() { return m_inlineCapacity; } void clear() { m_allocator = Allocator(); m_structure.clear(); m_inlineCapacity = 0; ASSERT(isNull()); } void visitAggregate(SlotVisitor& 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; unsigned m_inlineCapacity; }; } // namespace JSC