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32 #include "MacroAssembler.h"
34 #include "PropertySlot.h"
35 #include "Structure.h"
36 #include "StructureChain.h"
37 #include <wtf/VectorTraits.h>
39 #define POLYMORPHIC_LIST_CACHE_SIZE 8
43 // *Sigh*, If the JIT is enabled we need to track the stubRountine (of type CodeLocationLabel),
44 // If the JIT is not in use we don't actually need the variable (that said, if the JIT is not in use we don't
45 // curently actually use PolymorphicAccessStructureLists, which we should). Anyway, this seems like the best
46 // solution for now - will need to something smarter if/when we actually want mixed-mode operation.
53 typedef MacroAssemblerCodeRef PolymorphicAccessStructureListStubRoutineType;
55 // Structure used by op_get_by_id_self_list and op_get_by_id_proto_list instruction to hold data off the main opcode stream.
56 struct PolymorphicAccessStructureList {
57 WTF_MAKE_FAST_ALLOCATED;
59 struct PolymorphicStubInfo {
61 PolymorphicAccessStructureListStubRoutineType stubRoutine;
62 WriteBarrier<Structure> base;
64 WriteBarrierBase<Structure> proto;
65 WriteBarrierBase<StructureChain> chain;
73 void set(JSGlobalData& globalData, JSCell* owner, PolymorphicAccessStructureListStubRoutineType _stubRoutine, Structure* _base)
75 stubRoutine = _stubRoutine;
76 base.set(globalData, owner, _base);
81 void set(JSGlobalData& globalData, JSCell* owner, PolymorphicAccessStructureListStubRoutineType _stubRoutine, Structure* _base, Structure* _proto)
83 stubRoutine = _stubRoutine;
84 base.set(globalData, owner, _base);
85 u.proto.set(globalData, owner, _proto);
89 void set(JSGlobalData& globalData, JSCell* owner, PolymorphicAccessStructureListStubRoutineType _stubRoutine, Structure* _base, StructureChain* _chain)
91 stubRoutine = _stubRoutine;
92 base.set(globalData, owner, _base);
93 u.chain.set(globalData, owner, _chain);
96 } list[POLYMORPHIC_LIST_CACHE_SIZE];
98 PolymorphicAccessStructureList(JSGlobalData& globalData, JSCell* owner, PolymorphicAccessStructureListStubRoutineType stubRoutine, Structure* firstBase)
100 list[0].set(globalData, owner, stubRoutine, firstBase);
103 PolymorphicAccessStructureList(JSGlobalData& globalData, JSCell* owner, PolymorphicAccessStructureListStubRoutineType stubRoutine, Structure* firstBase, Structure* firstProto)
105 list[0].set(globalData, owner, stubRoutine, firstBase, firstProto);
108 PolymorphicAccessStructureList(JSGlobalData& globalData, JSCell* owner, PolymorphicAccessStructureListStubRoutineType stubRoutine, Structure* firstBase, StructureChain* firstChain)
110 list[0].set(globalData, owner, stubRoutine, firstBase, firstChain);
113 void visitAggregate(SlotVisitor& visitor, int count)
115 for (int i = 0; i < count; ++i) {
116 PolymorphicStubInfo& info = list[i];
118 // We're being marked during initialisation of an entry
119 ASSERT(!info.u.proto);
123 visitor.append(&info.base);
124 if (info.u.proto && !info.isChain)
125 visitor.append(&info.u.proto);
126 if (info.u.chain && info.isChain)
127 visitor.append(&info.u.chain);
135 Instruction(Opcode opcode)
137 #if !ENABLE(COMPUTED_GOTO_INTERPRETER)
138 // We have to initialize one of the pointer members to ensure that
139 // the entire struct is initialized, when opcode is not a pointer.
145 Instruction(int operand)
147 // We have to initialize one of the pointer members to ensure that
148 // the entire struct is initialized in 64-bit.
153 Instruction(JSGlobalData& globalData, JSCell* owner, Structure* structure)
156 u.structure.set(globalData, owner, structure);
158 Instruction(JSGlobalData& globalData, JSCell* owner, StructureChain* structureChain)
160 u.structureChain.clear();
161 u.structureChain.set(globalData, owner, structureChain);
163 Instruction(JSGlobalData& globalData, JSCell* owner, JSCell* jsCell)
166 u.jsCell.set(globalData, owner, jsCell);
169 Instruction(PropertySlot::GetValueFunc getterFunc) { u.getterFunc = getterFunc; }
174 WriteBarrierBase<Structure> structure;
175 WriteBarrierBase<StructureChain> structureChain;
176 WriteBarrierBase<JSCell> jsCell;
177 PropertySlot::GetValueFunc getterFunc;
181 Instruction(StructureChain*);
182 Instruction(Structure*);
189 template<> struct VectorTraits<JSC::Instruction> : VectorTraitsBase<true, JSC::Instruction> { };
193 #endif // Instruction_h