~AutoAttachToRuntime() {
     // This makes the source visible to the GC. If compilation fails, and no
     // script refers to it, it will be collected.
     if (ss)
         ss->attachToRuntime(rt);
 }
Exemple #2
0
JSObject *
GlobalObject::initFunctionAndObjectClasses(JSContext *cx)
{
    Rooted<GlobalObject*> self(cx, this);

    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, self);

    RootedObject objectProto(cx);

    /*
     * Create |Object.prototype| first, mirroring CreateBlankProto but for the
     * prototype of the created object.
     */
    objectProto = NewObjectWithGivenProto(cx, &ObjectClass, NULL, self);
    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. */
    RootedFunction functionProto(cx);
    {
        JSObject *functionProto_ = NewObjectWithGivenProto(cx, &FunctionClass, objectProto, self);
        if (!functionProto_)
            return NULL;
        functionProto = functionProto_->toFunction();

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

        const char *rawSource = "() {\n}";
        size_t sourceLen = strlen(rawSource);
        jschar *source = InflateString(cx, rawSource, &sourceLen);
        if (!source)
            return NULL;
        ScriptSource *ss = cx->new_<ScriptSource>();
        if (!ss) {
            cx->free_(source);
            return NULL;
        }
        JS_ALWAYS_TRUE(ss->setSource(cx, source, sourceLen, false, NULL, true));

        CompileOptions options(cx);
        options.setNoScriptRval(true)
               .setVersion(JSVERSION_DEFAULT);
        Rooted<JSScript*> script(cx, JSScript::Create(cx,
                                                      /* enclosingScope = */ NullPtr(),
                                                      /* savedCallerFun = */ false,
                                                      options,
                                                      /* staticLevel = */ 0,
                                                      ss,
                                                      0,
                                                      ss->length()));
        ss->attachToRuntime(cx->runtime);
        if (!script || !JSScript::fullyInitTrivial(cx, script))
            return NULL;

        functionProto->initScript(script);
        functionProto->getType(cx)->interpretedFunction = functionProto;
        script->setFunction(functionProto);

        if (!functionProto->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 (!functionProto->setNewTypeUnknown(cx))
            return NULL;
    }

    /* Create the Object function now that we have a [[Prototype]] for it. */
    RootedFunction objectCtor(cx);
    {
        JSObject *ctor = NewObjectWithGivenProto(cx, &FunctionClass, functionProto, self);
        if (!ctor)
            return NULL;
        objectCtor = js_NewFunction(cx, ctor, js_Object, 1, JSFUN_CONSTRUCTOR, self,
                                    CLASS_NAME(cx, Object));
        if (!objectCtor)
            return NULL;
    }

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

    /* Create |Function| so it and |Function.prototype| can be installed. */
    RootedFunction functionCtor(cx);
    {
        // Note that ctor is rooted purely for the JS_ASSERT at the end
        RootedObject ctor(cx, NewObjectWithGivenProto(cx, &FunctionClass, functionProto, self));
        if (!ctor)
            return NULL;
        functionCtor = js_NewFunction(cx, ctor, Function, 1, JSFUN_CONSTRUCTOR, self,
                                      CLASS_NAME(cx, Function));
        if (!functionCtor)
            return NULL;
        JS_ASSERT(ctor == functionCtor);
    }

    /*
     * Install |Function| and |Function.prototype| so that we can freely create
     * functions and objects without special effort.
     */
    self->setFunctionClassDetails(functionCtor, functionProto);

    /*
     * The hard part's done: now go back and add all the properties these
     * primordial values have.
     */
    if (!LinkConstructorAndPrototype(cx, objectCtor, objectProto) ||
        !DefinePropertiesAndBrand(cx, objectProto, NULL, object_methods))
    {
        return NULL;
    }

    /*
     * Add an Object.prototype.__proto__ accessor property to implement that
     * extension (if it's actually enabled).  Cache the getter for this
     * function so that cross-compartment [[Prototype]]-getting is implemented
     * in one place.
     */
    Rooted<JSFunction*> getter(cx, js_NewFunction(cx, NULL, ProtoGetter, 0, 0, self, NULL));
    if (!getter)
        return NULL;
#if JS_HAS_OBJ_PROTO_PROP
    Rooted<JSFunction*> setter(cx, js_NewFunction(cx, NULL, ProtoSetter, 0, 0, self, NULL));
    if (!setter)
        return NULL;
    RootedValue undefinedValue(cx, UndefinedValue());
    if (!objectProto->defineProperty(cx, cx->runtime->atomState.protoAtom, undefinedValue,
                                     JS_DATA_TO_FUNC_PTR(PropertyOp, getter.get()),
                                     JS_DATA_TO_FUNC_PTR(StrictPropertyOp, setter.get()),
                                     JSPROP_GETTER | JSPROP_SETTER | JSPROP_SHARED))
    {
        return NULL;
    }
#endif /* JS_HAS_OBJ_PROTO_PROP */
    self->setProtoGetter(getter);


    if (!DefinePropertiesAndBrand(cx, objectCtor, NULL, object_static_methods) ||
        !LinkConstructorAndPrototype(cx, functionCtor, functionProto) ||
        !DefinePropertiesAndBrand(cx, functionProto, NULL, function_methods) ||
        !DefinePropertiesAndBrand(cx, functionCtor, NULL, NULL))
    {
        return NULL;
    }

    /* Add the global Function and Object properties now. */
    jsid objectId = NameToId(CLASS_NAME(cx, Object));
    if (!self->addDataProperty(cx, objectId, JSProto_Object + JSProto_LIMIT * 2, 0))
        return NULL;
    jsid functionId = NameToId(CLASS_NAME(cx, Function));
    if (!self->addDataProperty(cx, functionId, JSProto_Function + JSProto_LIMIT * 2, 0))
        return NULL;

    /* Heavy lifting done, but lingering tasks remain. */

    /* ES5 15.1.2.1. */
    RootedId id(cx, NameToId(cx->runtime->atomState.evalAtom));
    JSObject *evalobj = js_DefineFunction(cx, self, id, IndirectEval, 1, JSFUN_STUB_GSOPS);
    if (!evalobj)
        return NULL;
    self->setOriginalEval(evalobj);

    /* ES5 13.2.3: Construct the unique [[ThrowTypeError]] function object. */
    RootedFunction throwTypeError(cx, js_NewFunction(cx, NULL, ThrowTypeError, 0, 0, self, NULL));
    if (!throwTypeError)
        return NULL;
    if (!throwTypeError->preventExtensions(cx))
        return NULL;
    self->setThrowTypeError(throwTypeError);

    RootedObject intrinsicsHolder(cx, JS_NewObject(cx, NULL, NULL, self));
    if (!intrinsicsHolder)
        return NULL;
    self->setIntrinsicsHolder(intrinsicsHolder);
    if (!JS_DefineFunctions(cx, intrinsicsHolder, intrinsic_functions))
        return NULL;

    /*
     * The global object should have |Object.prototype| as its [[Prototype]].
     * Eventually we'd like to have standard classes be there from the start,
     * and thus we would know we were always setting what had previously been a
     * null [[Prototype]], but right now some code assumes it can set the
     * [[Prototype]] before standard classes have been initialized.  For now,
     * only set the [[Prototype]] if it hasn't already been set.
     */
    if (self->shouldSplicePrototype(cx) && !self->splicePrototype(cx, objectProto))
        return NULL;

    /*
     * Notify any debuggers about the creation of the script for
     * |Function.prototype| -- after all initialization, for simplicity.
     */
    js_CallNewScriptHook(cx, functionProto->script(), functionProto);
    return functionProto;
}