C++ InvokeArgsGuard::calleev方法代码示例

bool
BooleanGetPrimitiveValueSlow(JSContext *cx, JSObject &obj, Value *vp)
{
    InvokeArgsGuard ag;
    if (!cx->stack.pushInvokeArgs(cx, 0, &ag))
        return false;
    ag.calleev() = cx->compartment->maybeGlobal()->booleanValueOf();
    ag.thisv().setObject(obj);
    if (!Invoke(cx, ag))
        return false;
    *vp = ag.rval();
    return true;
}

bool
BooleanGetPrimitiveValueSlow(JSContext *cx, JSObject &obj, Value *vp)
{
    JS_ASSERT(ObjectClassIs(obj, ESClass_Boolean, cx));
    JS_ASSERT(obj.isProxy());

    /*
     * To respect the proxy abstraction, we can't simply unwrap and call
     * getPrimitiveThis on the wrapped object. All we know is that obj says
     * its [[Class]] is "Boolean". Boolean.prototype.valueOf is specified to
     * return the [[PrimitiveValue]] internal property, so call that instead.
     */
    InvokeArgsGuard ag;
    if (!cx->stack.pushInvokeArgs(cx, 0, &ag))
        return false;
    ag.calleev().setUndefined();
    ag.thisv().setObject(obj);
    if (!GetProxyHandler(&obj)->nativeCall(cx, &obj, &BooleanClass, bool_valueOf, ag))
        return false;
    *vp = ag.rval();
    return true;
}

static bool
PreprocessValue(JSContext *cx, JSObject *holder, KeyType key, Value *vp, StringifyContext *scx)
{
    JSString *keyStr = NULL;

    /* Step 2. */
    if (vp->isObject()) {
        Value toJSON;
        jsid id = NameToId(cx->runtime->atomState.toJSONAtom);
        if (!js_GetMethod(cx, RootedVarObject(cx, &vp->toObject()), id, 0, &toJSON))
            return false;

        if (js_IsCallable(toJSON)) {
            keyStr = KeyStringifier<KeyType>::toString(cx, key);
            if (!keyStr)
                return false;

            InvokeArgsGuard args;
            if (!cx->stack.pushInvokeArgs(cx, 1, &args))
                return false;

            args.calleev() = toJSON;
            args.thisv() = *vp;
            args[0] = StringValue(keyStr);

            if (!Invoke(cx, args))
                return false;
            *vp = args.rval();
        }
    }

    /* Step 3. */
    if (scx->replacer && scx->replacer->isCallable()) {
        if (!keyStr) {
            keyStr = KeyStringifier<KeyType>::toString(cx, key);
            if (!keyStr)
                return false;
        }

        InvokeArgsGuard args;
        if (!cx->stack.pushInvokeArgs(cx, 2, &args))
            return false;

        args.calleev() = ObjectValue(*scx->replacer);
        args.thisv() = ObjectValue(*holder);
        args[0] = StringValue(keyStr);
        args[1] = *vp;

        if (!Invoke(cx, args))
            return false;
        *vp = args.rval();
    }

    /* Step 4. */
    if (vp->isObject()) {
        JSObject &obj = vp->toObject();
        if (ObjectClassIs(obj, ESClass_Number, cx)) {
            double d;
            if (!ToNumber(cx, *vp, &d))
                return false;
            vp->setNumber(d);
        } else if (ObjectClassIs(obj, ESClass_String, cx)) {
            JSString *str = ToStringSlow(cx, *vp);
            if (!str)
                return false;
            vp->setString(str);
        } else if (ObjectClassIs(obj, ESClass_Boolean, cx)) {
            if (!BooleanGetPrimitiveValue(cx, obj, vp))
                return false;
            JS_ASSERT(vp->isBoolean());
        }
    }

    return true;
}

bool
js::SetElement(JSContext *cx, ObjectImpl *obj, ObjectImpl *receiver, uint32_t index,
               const Value &v, bool *succeeded)
{
    NEW_OBJECT_REPRESENTATION_ONLY();

    do {
        MOZ_ASSERT(obj);

        if (static_cast<JSObject *>(obj)->isProxy()) { // XXX
            MOZ_NOT_REACHED("NYI: proxy [[SetP]]");
            return false;
        }

        PropDesc ownDesc;
        if (!GetOwnElement(cx, obj, index, &ownDesc))
            return false;

        if (!ownDesc.isUndefined()) {
            if (ownDesc.isDataDescriptor()) {
                if (!ownDesc.writable()) {
                    *succeeded = false;
                    return true;
                }

                if (receiver == obj) {
                    PropDesc updateDesc = PropDesc::valueOnly(v);
                    return DefineElement(cx, receiver, index, updateDesc, false, succeeded);
                }

                PropDesc newDesc;
                return DefineElement(cx, receiver, index, newDesc, false, succeeded);
            }

            if (ownDesc.isAccessorDescriptor()) {
                Value setter = ownDesc.setterValue();
                if (setter.isUndefined()) {
                    *succeeded = false;
                    return true;
                }

                InvokeArgsGuard args;
                if (!cx->stack.pushInvokeArgs(cx, 1, &args))
                    return false;

                /* Push set, receiver, and v as the sole argument. */
                args.calleev() = setter;
                args.thisv() = ObjectValue(*receiver);
                args[0] = v;

                *succeeded = true;
                return Invoke(cx, args);
            }

            MOZ_NOT_REACHED("NYI: setting PropertyOp-based property");
            return false;
        }

        obj = obj->getProto();
        if (obj)
            continue;

        PropDesc newDesc(v, PropDesc::Writable, PropDesc::Enumerable, PropDesc::Configurable);
        return DefineElement(cx, receiver, index, newDesc, false, succeeded);
    } while (false);

    MOZ_NOT_REACHED("buggy control flow");
    return false;
}

bool
js::GetElement(JSContext *cx, ObjectImpl *obj, ObjectImpl *receiver, uint32_t index,
               Value *vp)
{
    NEW_OBJECT_REPRESENTATION_ONLY();

    do {
        MOZ_ASSERT(obj);

        if (static_cast<JSObject *>(obj)->isProxy()) { // XXX
            MOZ_NOT_REACHED("NYI: proxy [[GetP]]");
            return false;
        }

        PropDesc desc;
        if (!GetOwnElement(cx, obj, index, &desc))
            return false;

        /* No property?  Recur or bottom out. */
        if (desc.isUndefined()) {
            obj = obj->getProto();
            if (obj)
                continue;

            vp->setUndefined();
            return true;
        }

        /* If it's a data property, return the value. */
        if (desc.isDataDescriptor()) {
            *vp = desc.value();
            return true;
        }

        /* If it's an accessor property, call its [[Get]] with the receiver. */
        if (desc.isAccessorDescriptor()) {
            Value get = desc.getterValue();
            if (get.isUndefined()) {
                vp->setUndefined();
                return true;
            }

            InvokeArgsGuard args;
            if (!cx->stack.pushInvokeArgs(cx, 0, &args))
                return false;

            /* Push get, receiver, and no args. */
            args.calleev() = get;
            args.thisv() = ObjectValue(*receiver);

            bool ok = Invoke(cx, args);
            *vp = args.rval();
            return ok;
        }

        /* Otherwise it's a PropertyOp-based property.  XXX handle this! */
        MOZ_NOT_REACHED("NYI: handle PropertyOp'd properties here");
        return false;
    } while (false);

    MOZ_NOT_REACHED("buggy control flow");
    return false;
}

/*
 * ES5 15.12.3 Str, steps 2-4, extracted to enable preprocessing of property
 * values when stringifying objects in JO.
 */
static bool
PreprocessValue(JSContext *cx, JSObject *holder, jsid key, Value *vp, StringifyContext *scx)
{
    JSString *keyStr = NULL;

    /* Step 2. */
    if (vp->isObject()) {
        Value toJSON;
        jsid id = ATOM_TO_JSID(cx->runtime->atomState.toJSONAtom);
        if (!js_GetMethod(cx, &vp->toObject(), id, JSGET_NO_METHOD_BARRIER, &toJSON))
            return false;

        if (js_IsCallable(toJSON)) {
            keyStr = IdToString(cx, key);
            if (!keyStr)
                return false;

            LeaveTrace(cx);
            InvokeArgsGuard args;
            if (!cx->stack.pushInvokeArgs(cx, 1, &args))
                return false;

            args.calleev() = toJSON;
            args.thisv() = *vp;
            args[0] = StringValue(keyStr);

            if (!Invoke(cx, args))
                return false;
            *vp = args.rval();
        }
    }

    /* Step 3. */
    if (scx->replacer && scx->replacer->isCallable()) {
        if (!keyStr) {
            keyStr = IdToString(cx, key);
            if (!keyStr)
                return false;
        }

        LeaveTrace(cx);
        InvokeArgsGuard args;
        if (!cx->stack.pushInvokeArgs(cx, 2, &args))
            return false;

        args.calleev() = ObjectValue(*scx->replacer);
        args.thisv() = ObjectValue(*holder);
        args[0] = StringValue(keyStr);
        args[1] = *vp;

        if (!Invoke(cx, args))
            return false;
        *vp = args.rval();
    }

    /* Step 4. */
    if (vp->isObject()) {
        JSObject *obj = &vp->toObject();
        Class *clasp = obj->getClass();
        if (clasp == &js_NumberClass) {
            double d;
            if (!ValueToNumber(cx, *vp, &d))
                return false;
            vp->setNumber(d);
        } else if (clasp == &js_StringClass) {
            JSString *str = js_ValueToString(cx, *vp);
            if (!str)
                return false;
            vp->setString(str);
        } else if (clasp == &js_BooleanClass) {
            *vp = obj->getPrimitiveThis();
            JS_ASSERT(vp->isBoolean());
        }
    }

    return true;
}