C++ JSFunction::initScript方法代码示例

bool
js::XDRInterpretedFunction(XDRState<mode> *xdr, JSObject **objp, JSScript *parentScript)
{
    /* NB: Keep this in sync with CloneInterpretedFunction. */
    JSFunction *fun;
    JSAtom *atom;
    uint32_t firstword;           /* flag telling whether fun->atom is non-null,
                                   plus for fun->u.i.skipmin, fun->u.i.wrapper,
                                   and 14 bits reserved for future use */
    uint32_t flagsword;           /* word for argument count and fun->flags */

    JSContext *cx = xdr->cx();
    JSScript *script;
    if (mode == XDR_ENCODE) {
        fun = (*objp)->toFunction();
        if (!fun->isInterpreted()) {
            JSAutoByteString funNameBytes;
            if (const char *name = GetFunctionNameBytes(cx, fun, &funNameBytes)) {
                JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_NOT_SCRIPTED_FUNCTION,
                                     name);
            }
            return false;
        }
        firstword = !!fun->atom;
        flagsword = (fun->nargs << 16) | fun->flags;
        atom = fun->atom;
        script = fun->script();
    } else {
        RootedObject parent(cx, NULL);
        fun = js_NewFunction(cx, NULL, NULL, 0, JSFUN_INTERPRETED, parent, NULL);
        if (!fun)
            return false;
        if (!fun->clearParent(cx))
            return false;
        if (!fun->clearType(cx))
            return false;
        atom = NULL;
        script = NULL;
    }

    if (!xdr->codeUint32(&firstword))
        return false;
    if ((firstword & 1U) && !XDRAtom(xdr, &atom))
        return false;
    if (!xdr->codeUint32(&flagsword))
        return false;

    if (!XDRScript(xdr, &script, parentScript))
        return false;

    if (mode == XDR_DECODE) {
        fun->nargs = flagsword >> 16;
        JS_ASSERT((flagsword & JSFUN_KINDMASK) >= JSFUN_INTERPRETED);
        fun->flags = uint16_t(flagsword);
        fun->atom.init(atom);
        fun->initScript(script);
        if (!script->typeSetFunction(cx, fun))
            return false;
        JS_ASSERT(fun->nargs == fun->script()->bindings.numArgs());
        js_CallNewScriptHook(cx, fun->script(), fun);
        *objp = fun;
    }

JSObject *
GlobalObject::initFunctionAndObjectClasses(JSContext *cx)
{
    JS_THREADSAFE_ASSERT(cx->compartment != cx->runtime->atomsCompartment);
    JS_ASSERT(isNative());

    /*
     * Calling a function from a cleared global triggers this (yeah, I know).
     * Uncomment this once bug 470510 is fixed (if that bug doesn't remove
     * isCleared entirely).
     */
    // JS_ASSERT(!isCleared());

    /* If cx has no global object, make this the global object. */
    if (!cx->globalObject)
        JS_SetGlobalObject(cx, this);

    /*
     * Create |Object.prototype| first, mirroring CreateBlankProto but for the
     * prototype of the created object.
     */
    JSObject *objectProto = NewObjectWithGivenProto(cx, &ObjectClass, NULL, this);
    if (!objectProto || !objectProto->setSingletonType(cx))
        return NULL;

    /*
     * The default 'new' type of Object.prototype is required by type inference
     * to have unknown properties, to simplify handling of e.g. heterogenous
     * objects in JSON and script literals.
     */
    if (!objectProto->setNewTypeUnknown(cx))
        return NULL;

    /* Create |Function.prototype| next so we can create other functions. */
    JSFunction *functionProto;
    {
        JSObject *proto = NewObjectWithGivenProto(cx, &FunctionClass, objectProto, this);
        if (!proto)
            return NULL;

        /*
         * Bizarrely, |Function.prototype| must be an interpreted function, so
         * give it the guts to be one.
         */
        functionProto = js_NewFunction(cx, proto, NULL, 0, JSFUN_INTERPRETED, this, NULL);
        if (!functionProto)
            return NULL;
        JS_ASSERT(proto == functionProto);
        functionProto->flags |= JSFUN_PROTOTYPE;

        JSScript *script =
            JSScript::NewScript(cx, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, JSVERSION_DEFAULT);
        if (!script)
            return NULL;
        script->noScriptRval = true;
        script->code[0] = JSOP_STOP;
        script->code[1] = SRC_NULL;
        functionProto->initScript(script);
        functionProto->getType(cx)->interpretedFunction = functionProto;
        script->setFunction(functionProto);

        if (!proto->setSingletonType(cx))
            return NULL;

        /*
         * The default 'new' type of Function.prototype is required by type
         * inference to have unknown properties, to simplify handling of e.g.
         * CloneFunctionObject.
         */
        if (!proto->setNewTypeUnknown(cx))
            return NULL;
    }

    /* Create the Object function now that we have a [[Prototype]] for it. */
    jsid objectId = ATOM_TO_JSID(CLASS_ATOM(cx, Object));
    JSFunction *objectCtor;
    {
        JSObject *ctor = NewObjectWithGivenProto(cx, &FunctionClass, functionProto, this);
        if (!ctor)
            return NULL;
        objectCtor = js_NewFunction(cx, ctor, js_Object, 1, JSFUN_CONSTRUCTOR, this,
                                    JSID_TO_ATOM(objectId));
        if (!objectCtor)
            return NULL;
        JS_ASSERT(ctor == objectCtor);

        objectCtor->setConstructorClass(&ObjectClass);
    }

    /*
     * Install |Object| and |Object.prototype| for the benefit of subsequent
     * code that looks for them.
     */
    setObjectClassDetails(objectCtor, objectProto);

    /* Create |Function| so it and |Function.prototype| can be installed. */
    jsid functionId = ATOM_TO_JSID(CLASS_ATOM(cx, Function));
    JSFunction *functionCtor;
    {
        JSObject *ctor =
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