root/core/MethodClosure.h

INCLUDED FROM

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#ifndef __avmplus_MethodClosure__
#define __avmplus_MethodClosure__


namespace avmplus
{
        class MethodClosureClass : public ClassClosure
        {
        public:
                MethodClosureClass(VTable* cvtable);

                // Function called as constructor ... not supported from user code
                // this = argv[0] (ignored)
                // arg1 = argv[1]
                // argN = argv[argc]
                Atom construct(int /*argc*/, Atom* /*argv*/)
                {
                        AvmAssert(false);
                        return nullObjectAtom;
                }

                Atom call(int argc, Atom* argv) 
                {
                        return construct(argc,argv);
                }

                MethodClosure* create(MethodEnv* env, Atom savedThis);
                DECLARE_SLOTS_MethodClosureClass;
        };

        /**
         * The MethodClosure class is used to represent method
         * closures; that is, a function which is a method of
         * a class.
         *
         * MethodClosure is how AVM+ supports the "method extraction"
         * behavior of ECMAScript Edition 4.  When a reference to
         * a method of a class is retrieved, a MethodClosure is
         * created.  The MethodClosure also remembers the object
         * instance that the method was extracted from.  When the
         * MethodClosure is invoked, the method is invoked with
         * "this" pointing to the remembered instance.
         */
        class MethodClosure : public FunctionObject
        {
                friend class MethodClosureClass;
                MethodClosure(VTable* cvtable, MethodEnv* call, Atom savedThis);

        public:
                // argc is args only, argv[0] = receiver(ignored)
                virtual Atom construct(int argc, Atom* argv);

                virtual bool isMethodClosure() { return true; }

#ifdef AVMPLUS_VERBOSE
                Stringp format(AvmCore* core) const;
#endif

                // Flash needs to peek at these for WeakMethodClosure, alas
                inline MethodEnv* peek_call() { return _call; }
                inline Atom peek_savedThis() { return _savedThis; }

        protected:
                virtual Atom get_coerced_receiver(Atom a);

        protected:
                ATOM_WB _savedThis;
                DECLARE_SLOTS_MethodClosure;
        };
}

#endif /* __avmplus_MethodClosure__ */