1/* 2 * Copyright (C) 2014 Apple Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#ifndef PolymorphicGetByIdList_h 27#define PolymorphicGetByIdList_h 28 29#if ENABLE(JIT) 30 31#include "CodeOrigin.h" 32#include "MacroAssembler.h" 33#include "Opcode.h" 34#include "Structure.h" 35#include <wtf/Vector.h> 36 37namespace JSC { 38 39class CodeBlock; 40struct StructureStubInfo; 41 42class GetByIdAccess { 43public: 44 enum AccessType { 45 Invalid, 46 SimpleInline, // This is the patched inline access. 47 SimpleStub, // This is a stub. 48 WatchedStub, 49 Getter, 50 CustomGetter 51 }; 52 53 GetByIdAccess() 54 : m_type(Invalid) 55 , m_chainCount(0) 56 { 57 } 58 59 GetByIdAccess( 60 VM&, JSCell* owner, AccessType, PassRefPtr<JITStubRoutine>, Structure*, 61 StructureChain* = 0, unsigned chainCount = 0); 62 63 ~GetByIdAccess(); 64 65 static GetByIdAccess fromStructureStubInfo(StructureStubInfo&); 66 67 bool isSet() const { return m_type != Invalid; } 68 bool operator!() const { return !isSet(); } 69 70 AccessType type() const { return m_type; } 71 72 Structure* structure() const { return m_structure.get(); } 73 74 StructureChain* chain() const { return m_chain.get(); } 75 unsigned chainCount() const { return m_chainCount; } 76 77 JITStubRoutine* stubRoutine() const 78 { 79 ASSERT(isSet()); 80 return m_stubRoutine.get(); 81 } 82 83 bool doesCalls() const { return type() == Getter || type() == CustomGetter; } 84 bool isWatched() const { return type() == WatchedStub; } 85 bool isSimple() const { return !doesCalls() && !isWatched(); } 86 87 bool visitWeak(RepatchBuffer&) const; 88 89private: 90 friend class CodeBlock; 91 92 AccessType m_type; 93 unsigned m_chainCount; 94 WriteBarrier<Structure> m_structure; 95 WriteBarrier<StructureChain> m_chain; 96 RefPtr<JITStubRoutine> m_stubRoutine; 97}; 98 99class PolymorphicGetByIdList { 100 WTF_MAKE_FAST_ALLOCATED; 101public: 102 // Either creates a new polymorphic get list, or returns the one that is already in 103 // place. 104 static PolymorphicGetByIdList* from(StructureStubInfo&); 105 106 ~PolymorphicGetByIdList(); 107 108 MacroAssemblerCodePtr currentSlowPathTarget(StructureStubInfo& stubInfo) const; 109 110 void addAccess(const GetByIdAccess&); 111 112 bool isEmpty() const { return m_list.isEmpty(); } 113 unsigned size() const { return m_list.size(); } 114 bool isFull() const; 115 bool isAlmostFull() const; // True if adding an element would make isFull() true. 116 const GetByIdAccess& at(unsigned i) const { return m_list[i]; } 117 const GetByIdAccess& operator[](unsigned i) const { return m_list[i]; } 118 119 bool didSelfPatching() const; // Are any of the accesses SimpleInline? 120 121 bool visitWeak(RepatchBuffer&) const; 122 123private: 124 friend class CodeBlock; 125 126 PolymorphicGetByIdList(StructureStubInfo&); 127 128 Vector<GetByIdAccess, 2> m_list; 129}; 130 131} // namespace JSC 132 133#endif // ENABLE(JIT) 134 135#endif // PolymorphicGetByIdList_h 136 137