root/core/ClassClosure.cpp

DEFINITIONS

1. createVanillaPrototype
2. get_prototype
3. set_prototype
4. ivtable
5. newInstance
6. construct
7. call
8. size
9. format
10. implToString

/* ***** BEGIN LICENSE BLOCK *****
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 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
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 * The Original Code is [Open Source Virtual Machine.].
 *
 * The Initial Developer of the Original Code is
 * Adobe System Incorporated.
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 * the Initial Developer. All Rights Reserved.
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 *   Adobe AS3 Team
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#include "avmplus.h"


namespace avmplus
{
        ClassClosure::ClassClosure(VTable *cvtable)
                : ScriptObject(cvtable, NULL)
        {
                AvmAssert(traits()->getSizeOfInstance() >= sizeof(ClassClosure));

                // prototype will be set by caller
                
                // don't assert here any more: MethodClosure descends 
                //AvmAssert(cvtable->traits->itraits != NULL);
                //AvmAssert(ivtable() != NULL);
        }

        void ClassClosure::createVanillaPrototype()
        {
        prototype = toplevel()->objectClass->construct();
        }

        Atom ClassClosure::get_prototype()
        {
                // Illegal to apply this getter to anything but instances of Class
                // (verifier should ensure this)
                return prototype ? prototype->atom() : undefinedAtom;
        }

        void ClassClosure::set_prototype(Atom value)
        {
                // ISSUE can value be null/undefined?

                if (AvmCore::isNullOrUndefined(value))
                {
                        this->prototype = NULL;
                }
                else
                {
                        if (!AvmCore::isObject(value))
                        {
                                toplevel()->throwTypeError(kPrototypeTypeError);
                        }

                        // allow any prototype object.  if the object has methods or slots, so be it
                        this->prototype = AvmCore::atomToScriptObject(value);
                }
        }

        VTable* ClassClosure::ivtable() const
        {
                return vtable->ivtable;
        }

        // Called from construct or generated code to alloc a new instance
        ScriptObject* ClassClosure::newInstance() 
        {
                VTable* ivtable = this->ivtable();
                AvmAssert(ivtable != NULL);

                if (prototype == NULL) // ES3 spec, 13.2.2 (we've already ensured prototype is either an Object or null)
                        prototype = AvmCore::atomToScriptObject(toplevel()->objectClass->get_prototype());

                ScriptObject *obj = createInstance(ivtable, prototype);

                return obj;
        }

        // this = argv[0] (ignored)
        // arg1 = argv[1]
        // argN = argv[argc]
        Atom ClassClosure::construct(int argc, Atom* argv)
        {
                VTable* ivtable = this->ivtable();
                AvmAssert(ivtable != NULL);
                AvmAssert(argv != NULL); // need at least one arg spot passed in

                ScriptObject* obj = newInstance();

                Atom a = obj->atom();
                argv[0] = a; // new object is receiver
                ivtable->init->coerceEnter(argc, argv);
                // this is a class. always return new instance.
                return a;
        }

        // this = argv[0]
        // arg1 = argv[1]
        // argN = argv[argc]
        Atom ClassClosure::call(int argc, Atom* argv)
        {
                Toplevel* toplevel = this->toplevel();
                // explicit coercion of a class object.
                if (argc != 1)
                {
                        toplevel->throwArgumentError(kCoerceArgumentCountError, toplevel->core()->toErrorString(argc));
                }
                return toplevel->coerce(argv[1], (Traits*)ivtable()->traits);
        }

#ifdef DEBUGGER
        uint64 ClassClosure::size() const
        {
                uint64 size = ScriptObject::size();
                size += vtable->size();
                return size;
        }
#endif

#ifdef AVMPLUS_VERBOSE
        Stringp ClassClosure::format(AvmCore* core) const
        {
                if (traits()->name())
                {
                        return traits()->format(core);
                }

                Stringp prefix = core->newConstantStringLatin1("CC{}@");
                return core->concatStrings(prefix, core->formatAtomPtr(atom()));
        }
#endif

        Stringp ClassClosure::implToString() const
        {
                AvmCore* core = this->core();
                Traits* t = this->traits()->itraits;
                Stringp s = core->concatStrings(core->newConstantStringLatin1("[class "), t->name());
                return core->concatStrings(s, core->newConstantStringLatin1("]"));
        }
}