ce1e10f5fc
This moves the __proto__ property to Object.prototype and turns it into a callback property actually present in the descriptor array as opposed to a hack in the properties lookup. For now it still is a "magic" data property using foreign callbacks and not an accessor property visible to JavaScript. The second effect of this change is that JSON.parse() no longer treats the __proto__ property specially, it will be defined as any other data property. Note that object literals still have their special handling. R=rossberg@chromium.org BUG=v8:621,v8:1949,v8:2441 TEST=mjsunit,cctest,test262 Review URL: https://codereview.chromium.org/12212011 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@13728 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
80 lines
3.4 KiB
JavaScript
80 lines
3.4 KiB
JavaScript
// Copyright 2011 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// Flags: --expose-natives-as=builtins
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// Checks that all function properties of the builtin object that are actually
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// constructors (recognized by having properties on their .prototype object),
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// have only unconfigurable properties on the prototype, and the methods
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// are also non-writable.
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var names = Object.getOwnPropertyNames(builtins);
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function isFunction(obj) {
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return typeof obj == "function";
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}
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function checkConstructor(func, name) {
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// A constructor is a function with a prototype and properties on the
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// prototype object besides "constructor";
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if (name.charAt(0) == "$") return;
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if (typeof func.prototype != "object") return;
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var propNames = Object.getOwnPropertyNames(func.prototype);
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if (propNames.length == 0 ||
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(propNames.length == 1 && propNames[0] == "constructor")) {
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// Not a constructor.
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return;
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}
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var proto_desc = Object.getOwnPropertyDescriptor(func, "prototype");
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assertTrue(proto_desc.hasOwnProperty("value"), name);
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assertFalse(proto_desc.writable, name);
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assertFalse(proto_desc.configurable, name);
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var prototype = proto_desc.value;
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assertEquals(null, Object.getPrototypeOf(prototype), name);
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for (var i = 0; i < propNames.length; i++) {
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var propName = propNames[i];
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if (propName == "constructor") continue;
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var testName = name + "-" + propName;
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var propDesc = Object.getOwnPropertyDescriptor(prototype, propName);
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assertTrue(propDesc.hasOwnProperty("value"), testName);
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assertFalse(propDesc.configurable, testName);
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if (isFunction(propDesc.value)) {
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assertFalse(propDesc.writable, testName);
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}
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}
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}
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for (var i = 0; i < names.length; i++) {
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var name = names[i];
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var desc = Object.getOwnPropertyDescriptor(builtins, name);
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assertTrue(desc.hasOwnProperty("value"));
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var value = desc.value;
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if (isFunction(value)) {
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checkConstructor(value, name);
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}
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}
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