24e058d0ed
LOG=N BUG=v8:1543 Review URL: https://codereview.chromium.org/1417063011 Cr-Commit-Position: refs/heads/master@{#31983}
101 lines
3.8 KiB
JavaScript
101 lines
3.8 KiB
JavaScript
// Copyright 2015 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Flags: --harmony-proxies --strong-mode
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// Forwarding proxies adapted from proposal definition
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function handlerMaker1(obj) {
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return {
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getPropertyDescriptor: function(name) {
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var desc;
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var searchObj = obj;
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while (desc === undefined && searchObj != null) {
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desc = Object.getOwnPropertyDescriptor(searchObj, name);
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searchObj = searchObj.__proto__;
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}
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// a trapping proxy's properties must always be configurable
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if (desc !== undefined) { desc.configurable = true; }
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return desc;
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},
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fix: function() {
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if (Object.isFrozen(obj)) {
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var result = {};
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Object.getOwnPropertyNames(obj).forEach(function(name) {
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result[name] = Object.getOwnPropertyDescriptor(obj, name);
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});
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return result;
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}
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// As long as obj is not frozen, the proxy won't allow itself to be fixed
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return undefined; // will cause a TypeError to be thrown
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}
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};
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}
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function handlerMaker2(obj) {
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return {
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get: function(receiver, name) {
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return obj[name];
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},
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fix: function() {
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if (Object.isFrozen(obj)) {
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var result = {};
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Object.getOwnPropertyNames(obj).forEach(function(name) {
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result[name] = Object.getOwnPropertyDescriptor(obj, name);
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});
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return result;
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}
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// As long as obj is not frozen, the proxy won't allow itself to be fixed
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return undefined; // will cause a TypeError to be thrown
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}
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};
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}
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var baseObj = {};
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var proxy1 = new Proxy({}, handlerMaker1(baseObj));
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var proxy2 = new Proxy({}, handlerMaker2(baseObj));
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var childObj1 = { __proto__: proxy1 };
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var childObj2 = { __proto__: proxy2 };
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var childObjAccessor1 = { set foo(_){}, set "1"(_){}, __proto__: proxy1 };
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var childObjAccessor2 = { set foo(_){}, set "1"(_){}, __proto__: proxy2 };
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(function() {
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"use strong";
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// TODO(conradw): These asserts are sanity checking V8's proxy implementation.
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// Strong mode semantics for ES6 proxies still need to be explored.
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assertDoesNotThrow(function(){proxy1.foo});
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assertDoesNotThrow(function(){proxy1[1]});
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assertDoesNotThrow(function(){proxy2.foo});
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assertDoesNotThrow(function(){proxy2[1]});
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assertDoesNotThrow(function(){childObj1.foo});
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assertDoesNotThrow(function(){childObj1[1]});
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assertDoesNotThrow(function(){childObj2.foo});
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assertDoesNotThrow(function(){childObj2[1]});
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assertThrows(function(){baseObj.foo}, TypeError);
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assertThrows(function(){baseObj[1]}, TypeError);
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assertThrows(function(){childObjAccessor1.foo}, TypeError);
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assertThrows(function(){childObjAccessor1[1]}, TypeError);
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assertThrows(function(){childObjAccessor2.foo}, TypeError);
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assertThrows(function(){childObjAccessor2[1]}, TypeError);
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// Once the proxy is no longer trapping, property access should have strong
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// semantics.
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Object.freeze(baseObj);
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// TODO(neis): Reenable once proxies properly support freeze.
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//
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// Object.freeze(proxy1);
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// assertThrows(function(){proxy1.foo}, TypeError);
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// assertThrows(function(){proxy1[1]}, TypeError);
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// assertThrows(function(){childObj1.foo}, TypeError);
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// assertThrows(function(){childObj1[1]}, TypeError);
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// assertThrows(function(){childObjAccessor1.foo}, TypeError);
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// assertThrows(function(){childObjAccessor1[1]}, TypeError);
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//
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// Object.freeze(proxy2);
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// assertThrows(function(){proxy2.foo}, TypeError);
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// assertThrows(function(){proxy2[1]}, TypeError);
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// assertThrows(function(){childObj2.foo}, TypeError);
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// assertThrows(function(){childObj2[1]}, TypeError);
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// assertThrows(function(){childObjAccessor2.foo}, TypeError);
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// assertThrows(function(){childObjAccessor2[1]}, TypeError);
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})();
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