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29 #ifndef JSVariableObject_h
30 #define JSVariableObject_h
34 #include "SymbolTable.h"
35 #include "UnusedParam.h"
36 #include <wtf/OwnArrayPtr.h>
37 #include <wtf/UnusedParam.h>
43 class JSVariableObject : public JSNonFinalObject {
47 typedef JSNonFinalObject Base;
49 SymbolTable& symbolTable() const { return *m_symbolTable; }
51 virtual void putWithAttributes(ExecState*, const Identifier&, JSValue, unsigned attributes) = 0;
53 virtual bool deleteProperty(ExecState*, const Identifier&);
54 virtual void getOwnPropertyNames(ExecState*, PropertyNameArray&, EnumerationMode mode = ExcludeDontEnumProperties);
56 virtual bool isVariableObject() const;
57 virtual bool isDynamicScope(bool& requiresDynamicChecks) const = 0;
59 WriteBarrier<Unknown>& registerAt(int index) const { return m_registers[index]; }
61 WriteBarrier<Unknown>* const * addressOfRegisters() const { return &m_registers; }
62 static size_t offsetOfRegisters() { return OBJECT_OFFSETOF(JSVariableObject, m_registers); }
64 static Structure* createStructure(JSGlobalData& globalData, JSGlobalObject* globalObject, JSValue prototype)
66 return Structure::create(globalData, globalObject, prototype, TypeInfo(ObjectType, StructureFlags), &s_info);
70 static const unsigned StructureFlags = OverridesGetPropertyNames | JSNonFinalObject::StructureFlags;
72 JSVariableObject(JSGlobalData& globalData, Structure* structure, SymbolTable* symbolTable, Register* registers)
73 : JSNonFinalObject(globalData, structure)
74 , m_symbolTable(symbolTable)
75 , m_registers(reinterpret_cast<WriteBarrier<Unknown>*>(registers))
79 void finishCreation(JSGlobalData& globalData)
81 Base::finishCreation(globalData);
82 ASSERT(m_symbolTable);
83 COMPILE_ASSERT(sizeof(WriteBarrier<Unknown>) == sizeof(Register), Register_should_be_same_size_as_WriteBarrier);
86 PassOwnArrayPtr<WriteBarrier<Unknown> > copyRegisterArray(JSGlobalData&, WriteBarrier<Unknown>* src, size_t count, size_t callframeStarts);
87 void setRegisters(WriteBarrier<Unknown>* registers, PassOwnArrayPtr<WriteBarrier<Unknown> > registerArray);
89 bool symbolTableGet(const Identifier&, PropertySlot&);
90 bool symbolTableGet(const Identifier&, PropertyDescriptor&);
91 bool symbolTableGet(const Identifier&, PropertySlot&, bool& slotIsWriteable);
92 bool symbolTablePut(JSGlobalData&, const Identifier&, JSValue);
93 bool symbolTablePutWithAttributes(JSGlobalData&, const Identifier&, JSValue, unsigned attributes);
95 SymbolTable* m_symbolTable; // Maps name -> offset from "r" in register file.
96 WriteBarrier<Unknown>* m_registers; // "r" in the register file.
97 OwnArrayPtr<WriteBarrier<Unknown> > m_registerArray; // Independent copy of registers, used when a variable object copies its registers out of the register file.
100 inline bool JSVariableObject::symbolTableGet(const Identifier& propertyName, PropertySlot& slot)
102 SymbolTableEntry entry = symbolTable().inlineGet(propertyName.impl());
103 if (!entry.isNull()) {
104 slot.setValue(registerAt(entry.getIndex()).get());
110 inline bool JSVariableObject::symbolTableGet(const Identifier& propertyName, PropertySlot& slot, bool& slotIsWriteable)
112 SymbolTableEntry entry = symbolTable().inlineGet(propertyName.impl());
113 if (!entry.isNull()) {
114 slot.setValue(registerAt(entry.getIndex()).get());
115 slotIsWriteable = !entry.isReadOnly();
121 inline bool JSVariableObject::symbolTablePut(JSGlobalData& globalData, const Identifier& propertyName, JSValue value)
123 ASSERT(!Heap::heap(value) || Heap::heap(value) == Heap::heap(this));
125 SymbolTableEntry entry = symbolTable().inlineGet(propertyName.impl());
128 if (entry.isReadOnly())
130 registerAt(entry.getIndex()).set(globalData, this, value);
134 inline bool JSVariableObject::symbolTablePutWithAttributes(JSGlobalData& globalData, const Identifier& propertyName, JSValue value, unsigned attributes)
136 ASSERT(!Heap::heap(value) || Heap::heap(value) == Heap::heap(this));
138 SymbolTable::iterator iter = symbolTable().find(propertyName.impl());
139 if (iter == symbolTable().end())
141 SymbolTableEntry& entry = iter->second;
142 ASSERT(!entry.isNull());
143 entry.setAttributes(attributes);
144 registerAt(entry.getIndex()).set(globalData, this, value);
148 inline PassOwnArrayPtr<WriteBarrier<Unknown> > JSVariableObject::copyRegisterArray(JSGlobalData& globalData, WriteBarrier<Unknown>* src, size_t count, size_t callframeStarts)
150 OwnArrayPtr<WriteBarrier<Unknown> > registerArray = adoptArrayPtr(new WriteBarrier<Unknown>[count]);
151 for (size_t i = 0; i < callframeStarts; i++)
152 registerArray[i].set(globalData, this, src[i].get());
153 for (size_t i = callframeStarts + RegisterFile::CallFrameHeaderSize; i < count; i++)
154 registerArray[i].set(globalData, this, src[i].get());
156 return registerArray.release();
159 inline void JSVariableObject::setRegisters(WriteBarrier<Unknown>* registers, PassOwnArrayPtr<WriteBarrier<Unknown> > registerArray)
161 ASSERT(registerArray != m_registerArray);
162 m_registerArray = registerArray;
163 m_registers = registers;
168 #endif // JSVariableObject_h