зеркало из https://github.com/mozilla/gecko-dev.git
Bug 978236 - Implement Proxy.[[DefineProperty]] to ES6 standard. (r=jorendorff)
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029edde829
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@ -1,3 +1,5 @@
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// |jit-test| error: TypeError
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var f = (function () {}).bind({});
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var p = new Proxy(f, {});
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Object.defineProperty(p, "caller", {get: function(){}});
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@ -1049,10 +1049,6 @@ js::DefineProperty(JSContext *cx, HandleObject obj, HandleId id, const PropDesc
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}
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if (obj->getOps()->lookupGeneric) {
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/*
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* FIXME: Once ScriptedIndirectProxies are removed, this code should call
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* TrapDefineOwnProperty directly
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*/
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if (obj->is<ProxyObject>()) {
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RootedValue pd(cx, desc.descriptorValue());
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return Proxy::defineProperty(cx, obj, id, pd);
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@ -1135,10 +1131,6 @@ js::DefineProperties(JSContext *cx, HandleObject obj, HandleObject props)
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}
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if (obj->getOps()->lookupGeneric) {
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/*
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* FIXME: Once ScriptedIndirectProxies are removed, this code should call
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* TrapDefineOwnProperty directly
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*/
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if (obj->is<ProxyObject>()) {
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for (size_t i = 0, len = ids.length(); i < len; i++) {
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RootedValue pd(cx, descs[i].descriptorValue());
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@ -1199,22 +1199,20 @@ IsAccessorDescriptor(const PropertyDescriptor &desc)
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return desc.obj && desc.attrs & (JSPROP_GETTER | JSPROP_SETTER);
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}
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// Aux.5 ValidateProperty(O, P, Desc)
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// ES6 (5 April 2014) ValidateAndApplyPropertyDescriptor(O, P, Extensible, Desc, Current)
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// Since we are actually performing 9.1.6.2 IsCompatiblePropertyDescriptor(Extensible, Desc,
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// Current), some parameters are omitted.
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static bool
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ValidateProperty(JSContext *cx, HandleObject obj, HandleId id, Handle<PropDesc> desc, bool *bp)
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ValidatePropertyDescriptor(JSContext *cx, Handle<PropDesc> desc, Handle<PropertyDescriptor> current,
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bool *bp)
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{
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// step 1
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Rooted<PropertyDescriptor> current(cx);
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if (!GetOwnPropertyDescriptor(cx, obj, id, ¤t))
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return false;
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/*
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* steps 2-4 are redundant since ValidateProperty is never called unless
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* step 2 is redundant since ValidatePropertyDescriptor is never called unless
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* target.[[HasOwn]](P) is true
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*/
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JS_ASSERT(current.object());
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// step 5
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// step 3
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if (!desc.hasValue() && !desc.hasWritable() && !desc.hasGet() && !desc.hasSet() &&
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!desc.hasEnumerable() && !desc.hasConfigurable())
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{
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@ -1222,7 +1220,7 @@ ValidateProperty(JSContext *cx, HandleObject obj, HandleId id, Handle<PropDesc>
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return true;
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}
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// step 6
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// step 4
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if ((!desc.hasWritable() || desc.writable() == !current.isReadonly()) &&
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(!desc.hasGet() || desc.getter() == current.getter()) &&
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(!desc.hasSet() || desc.setter() == current.setter()) &&
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@ -1242,7 +1240,7 @@ ValidateProperty(JSContext *cx, HandleObject obj, HandleId id, Handle<PropDesc>
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}
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}
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// step 7
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// step 5
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if (current.isPermanent()) {
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if (desc.hasConfigurable() && desc.configurable()) {
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*bp = false;
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@ -1257,21 +1255,21 @@ ValidateProperty(JSContext *cx, HandleObject obj, HandleId id, Handle<PropDesc>
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}
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}
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// step 8
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// step 6
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if (desc.isGenericDescriptor()) {
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*bp = true;
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return true;
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}
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// step 9
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// step 7a
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if (IsDataDescriptor(current) != desc.isDataDescriptor()) {
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*bp = !current.isPermanent();
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return true;
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}
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// step 10
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// step 8
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if (IsDataDescriptor(current)) {
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JS_ASSERT(desc.isDataDescriptor()); // by step 9
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JS_ASSERT(desc.isDataDescriptor()); // by step 7a
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if (current.isPermanent() && current.isReadonly()) {
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if (desc.hasWritable() && desc.writable()) {
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*bp = false;
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@ -1293,15 +1291,27 @@ ValidateProperty(JSContext *cx, HandleObject obj, HandleId id, Handle<PropDesc>
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return true;
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}
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// steps 11-12
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JS_ASSERT(IsAccessorDescriptor(current)); // by step 10
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JS_ASSERT(desc.isAccessorDescriptor()); // by step 9
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// step 9
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JS_ASSERT(IsAccessorDescriptor(current)); // by step 8
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JS_ASSERT(desc.isAccessorDescriptor()); // by step 7a
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*bp = (!current.isPermanent() ||
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((!desc.hasSet() || desc.setter() == current.setter()) &&
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(!desc.hasGet() || desc.getter() == current.getter())));
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return true;
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}
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static bool
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ValidatePropertyDescriptor(JSContext *cx, HandleObject obj, HandleId id, Handle<PropDesc> desc, bool *bp)
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{
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// step 1
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Rooted<PropertyDescriptor> current(cx);
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if (!GetOwnPropertyDescriptor(cx, obj, id, ¤t))
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return false;
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return ValidatePropertyDescriptor(cx, desc, current, bp);
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}
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// Aux.6 IsSealed(O, P)
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static bool
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IsSealed(JSContext* cx, HandleObject obj, HandleId id, bool *bp)
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@ -1434,7 +1444,7 @@ TrapGetOwnProperty(JSContext *cx, HandleObject proxy, HandleId id, MutableHandle
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/* step 10 */
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if (isFixed) {
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bool valid;
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if (!ValidateProperty(cx, target, id, desc, &valid))
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if (!ValidatePropertyDescriptor(cx, target, id, desc, &valid))
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return false;
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if (!valid) {
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@ -1454,91 +1464,6 @@ TrapGetOwnProperty(JSContext *cx, HandleObject proxy, HandleId id, MutableHandle
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return true;
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}
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// TrapDefineOwnProperty(O, P, DescObj, Throw)
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static bool
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TrapDefineOwnProperty(JSContext *cx, HandleObject proxy, HandleId id, MutableHandleValue vp)
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{
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// step 1
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RootedObject handler(cx, GetDirectProxyHandlerObject(proxy));
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// step 2
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RootedObject target(cx, proxy->as<ProxyObject>().target());
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// step 3
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RootedValue trap(cx);
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if (!JSObject::getProperty(cx, handler, handler, cx->names().defineProperty, &trap))
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return false;
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// step 4
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if (trap.isUndefined()) {
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Rooted<PropertyDescriptor> desc(cx);
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if (!ParsePropertyDescriptorObject(cx, proxy, vp, &desc))
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return false;
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return JS_DefinePropertyById(cx, target, id, desc.value(), desc.attributes(),
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desc.getter(), desc.setter());
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}
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// step 5
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RootedValue normalizedDesc(cx, vp);
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if (!NormalizePropertyDescriptor(cx, &normalizedDesc))
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return false;
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// step 6
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RootedValue value(cx);
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if (!IdToExposableValue(cx, id, &value))
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return false;
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Value argv[] = {
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ObjectValue(*target),
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value,
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normalizedDesc
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};
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RootedValue trapResult(cx);
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if (!Invoke(cx, ObjectValue(*handler), trap, ArrayLength(argv), argv, &trapResult))
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return false;
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// steps 7-8
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if (ToBoolean(trapResult)) {
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bool isFixed;
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if (!HasOwn(cx, target, id, &isFixed))
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return false;
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bool extensible;
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if (!JSObject::isExtensible(cx, target, &extensible))
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return false;
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if (!extensible && !isFixed) {
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JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_CANT_DEFINE_NEW);
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return false;
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}
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Rooted<PropDesc> desc(cx);
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if (!desc.initialize(cx, normalizedDesc))
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return false;
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if (isFixed) {
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bool valid;
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if (!ValidateProperty(cx, target, id, desc, &valid))
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return false;
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if (!valid) {
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JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_CANT_DEFINE_INVALID);
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return false;
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}
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}
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if (!desc.configurable() && !isFixed) {
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JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_CANT_DEFINE_NE_AS_NC);
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return false;
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}
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vp.set(BooleanValue(true));
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return true;
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}
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// step 9
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// FIXME: API does not include a Throw parameter
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vp.set(BooleanValue(false));
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return true;
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}
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static inline void
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ReportInvalidTrapResult(JSContext *cx, JSObject *proxy, JSAtom *atom)
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{
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@ -1744,19 +1669,90 @@ ScriptedDirectProxyHandler::getOwnPropertyDescriptor(JSContext *cx, HandleObject
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return ParsePropertyDescriptorObject(cx, proxy, v, desc, true);
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}
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// ES6 (5 April 2014) Proxy.[[DefineOwnProperty]](O,P)
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bool
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ScriptedDirectProxyHandler::defineProperty(JSContext *cx, HandleObject proxy, HandleId id,
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MutableHandle<PropertyDescriptor> desc)
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{
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// step 1
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Rooted<PropDesc> d(cx);
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d.initFromPropertyDescriptor(desc);
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RootedValue v(cx);
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if (!FromGenericPropertyDescriptor(cx, &d, &v))
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// step 2
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RootedObject handler(cx, GetDirectProxyHandlerObject(proxy));
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// TODO: step 3: Implement revocation semantics. See bug 978279.
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// step 4
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RootedObject target(cx, proxy->as<ProxyObject>().target());
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// step 5-6
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RootedValue trap(cx);
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if (!JSObject::getProperty(cx, handler, handler, cx->names().defineProperty, &trap))
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return false;
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// step 2
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return TrapDefineOwnProperty(cx, proxy, id, &v);
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// step 7
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if (trap.isUndefined())
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return DirectProxyHandler::defineProperty(cx, proxy, id, desc);
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// step 8-9, with 9 blatantly defied.
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// FIXME: This is incorrect with respect to [[Origin]]. See bug 601379.
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RootedValue descObj(cx);
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if (!NewPropertyDescriptorObject(cx, desc, &descObj))
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return false;
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// step 10, 12
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RootedValue propKey(cx);
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if (!IdToExposableValue(cx, id, &propKey))
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return false;
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Value argv[] = {
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ObjectValue(*target),
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propKey,
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descObj
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};
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RootedValue trapResult(cx);
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if (!Invoke(cx, ObjectValue(*handler), trap, ArrayLength(argv), argv, &trapResult))
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return false;
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// step 11, 13
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if (ToBoolean(trapResult)) {
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// step 14-15
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Rooted<PropertyDescriptor> targetDesc(cx);
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if (!GetOwnPropertyDescriptor(cx, target, id, &targetDesc))
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return false;
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// step 16-17
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bool extensibleTarget;
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if (!JSObject::isExtensible(cx, target, &extensibleTarget))
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return false;
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// step 18-19
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bool settingConfigFalse = desc.isPermanent();
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if (!targetDesc.object()) {
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// step 20a
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if (!extensibleTarget) {
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JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_CANT_DEFINE_NEW);
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return false;
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}
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// step 20b
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if (settingConfigFalse) {
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JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_CANT_DEFINE_NE_AS_NC);
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return false;
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}
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} else {
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// step 21
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bool valid;
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Rooted<PropDesc> pd(cx);
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pd.initFromPropertyDescriptor(desc);
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if (!ValidatePropertyDescriptor(cx, pd, targetDesc, &valid))
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return false;
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if (!valid || (settingConfigFalse && !targetDesc.isPermanent())) {
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JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_CANT_DEFINE_INVALID);
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return false;
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}
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}
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}
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// [[DefineProperty]] should return a boolean value, which is used to do things like
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// strict-mode throwing. At present, the engine is not prepared to do that. See bug 826587.
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return true;
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}
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bool
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