JavaScriptCore-7601.1.46.3.tar.gz

[apple/javascriptcore.git] / runtime / JSLexicalEnvironment.h

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#ifndef JSLexicalEnvironment_h
#define JSLexicalEnvironment_h

#include "CodeBlock.h"
#include "CopiedSpaceInlines.h"
#include "JSEnvironmentRecord.h"
#include "SymbolTable.h"

namespace JSC {

class Register;
    
class JSLexicalEnvironment : public JSEnvironmentRecord {
private:
    JSLexicalEnvironment(VM&, Structure*, JSScope*, SymbolTable*);
    
public:
    typedef JSEnvironmentRecord Base;
    static const unsigned StructureFlags = Base::StructureFlags | OverridesGetOwnPropertySlot | OverridesGetPropertyNames;

    static JSLexicalEnvironment* create(
        VM& vm, Structure* structure, JSScope* currentScope, SymbolTable* symbolTable)
    {
        JSLexicalEnvironment* result = 
            new (
                NotNull,
                allocateCell<JSLexicalEnvironment>(vm.heap, allocationSize(symbolTable)))
            JSLexicalEnvironment(vm, structure, currentScope, symbolTable);
        result->finishCreation(vm);
        return result;
    }
    
    static JSLexicalEnvironment* create(VM& vm, CallFrame* callFrame, JSScope* currentScope, CodeBlock* codeBlock)
    {
        JSGlobalObject* globalObject = callFrame->lexicalGlobalObject();
        Structure* structure = globalObject->activationStructure();
        SymbolTable* symbolTable = codeBlock->symbolTable();
        return create(vm, structure, currentScope, symbolTable);
    }
        
    static bool getOwnPropertySlot(JSObject*, ExecState*, PropertyName, PropertySlot&);
    static void getOwnNonIndexPropertyNames(JSObject*, ExecState*, PropertyNameArray&, EnumerationMode);

    static void put(JSCell*, ExecState*, PropertyName, JSValue, PutPropertySlot&);

    static bool deleteProperty(JSCell*, ExecState*, PropertyName);

    static JSValue toThis(JSCell*, ExecState*, ECMAMode);

    DECLARE_INFO;

    static Structure* createStructure(VM& vm, JSGlobalObject* globalObject) { return Structure::create(vm, globalObject, jsNull(), TypeInfo(ActivationObjectType, StructureFlags), info()); }

private:
    bool symbolTableGet(PropertyName, PropertySlot&);
    bool symbolTableGet(PropertyName, PropertyDescriptor&);
    bool symbolTableGet(PropertyName, PropertySlot&, bool& slotIsWriteable);
    bool symbolTablePut(ExecState*, PropertyName, JSValue, bool shouldThrow);
    bool symbolTablePutWithAttributes(VM&, PropertyName, JSValue, unsigned attributes);
};

inline JSLexicalEnvironment::JSLexicalEnvironment(VM& vm, Structure* structure, JSScope* currentScope, SymbolTable* symbolTable)
    : Base(vm, structure, currentScope, symbolTable)
{
}

inline JSLexicalEnvironment* asActivation(JSValue value)
{
    ASSERT(asObject(value)->inherits(JSLexicalEnvironment::info()));
    return jsCast<JSLexicalEnvironment*>(asObject(value));
}
    
ALWAYS_INLINE JSLexicalEnvironment* Register::lexicalEnvironment() const
{
    return asActivation(jsValue());
}

} // namespace JSC

#endif // JSLexicalEnvironment_h