v8/test/mjsunit/proto-accessor.js
rossberg@chromium.org 13d99fe778 ES6: Tighten up Object.prototype.__proto__
The spec requires that we throw under certain conditions.

BUG=v8:3064
LOG=y
R=rossberg@chromium.org

Review URL: https://codereview.chromium.org/103853006

Patch from Erik Arvidsson <arv@chromium.org>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19479 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2014-02-19 11:59:05 +00:00

143 lines
4.8 KiB
JavaScript

// Copyright 2013 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// Flags: --harmony-symbols
var desc = Object.getOwnPropertyDescriptor(Object.prototype, "__proto__");
var getProto = desc.get;
var setProto = desc.set;
function TestNoPoisonPill() {
assertEquals("function", typeof desc.get);
assertEquals("function", typeof desc.set);
assertDoesNotThrow("desc.get.call({})");
assertDoesNotThrow("desc.set.call({}, {})");
var obj = {};
var obj2 = {};
desc.set.call(obj, obj2);
assertEquals(obj.__proto__, obj2);
assertEquals(desc.get.call(obj), obj2);
}
TestNoPoisonPill();
function TestRedefineObjectPrototypeProtoGetter() {
Object.defineProperty(Object.prototype, "__proto__", {
get: function() {
return 42;
}
});
assertEquals({}.__proto__, 42);
assertEquals(desc.get.call({}), Object.prototype);
var desc2 = Object.getOwnPropertyDescriptor(Object.prototype, "__proto__");
assertEquals(desc2.get.call({}), 42);
assertEquals(desc2.set.call({}), undefined);
Object.defineProperty(Object.prototype, "__proto__", {
set: function(x) {}
});
var desc3 = Object.getOwnPropertyDescriptor(Object.prototype, "__proto__");
assertEquals(desc3.get.call({}), 42);
assertEquals(desc3.set.call({}), undefined);
}
TestRedefineObjectPrototypeProtoGetter();
function TestRedefineObjectPrototypeProtoSetter() {
Object.defineProperty(Object.prototype, "__proto__", { set: undefined });
assertThrows(function() {
"use strict";
var o = {};
var p = {};
o.__proto__ = p;
}, TypeError);
}
TestRedefineObjectPrototypeProtoSetter();
function TestGetProtoOfValues() {
assertEquals(getProto.call(1), Number.prototype);
assertEquals(getProto.call(true), Boolean.prototype);
assertEquals(getProto.call(false), Boolean.prototype);
assertEquals(getProto.call('s'), String.prototype);
assertEquals(getProto.call(Symbol()), Symbol.prototype);
assertThrows(function() { getProto.call(null); }, TypeError);
assertThrows(function() { getProto.call(undefined); }, TypeError);
}
TestGetProtoOfValues();
var values = [1, true, false, 's', Symbol()];
function TestSetProtoOfValues() {
for (var i = 0; i < values.length; i++) {
assertEquals(setProto.call(values[i], i), undefined);
}
assertThrows(function() { setProto.call(null, 7); }, TypeError);
assertThrows(function() { setProto.call(undefined, 8); }, TypeError);
}
TestSetProtoOfValues();
function TestSetProtoToValue() {
var object = {};
var proto = {};
setProto.call(object, proto);
var valuesWithUndefined = values.concat(undefined);
for (var i = 0; i < valuesWithUndefined.length; i++) {
assertEquals(setProto.call(object, valuesWithUndefined[i]), undefined);
assertEquals(getProto.call(object), proto);
}
// null is the only valid value that can be used as a [[Prototype]].
assertEquals(setProto.call(object, null), undefined);
assertEquals(getProto.call(object), null);
}
TestSetProtoToValue();
function TestDeleteProto() {
assertTrue(delete Object.prototype.__proto__);
var o = {};
var p = {};
o.__proto__ = p;
assertEquals(Object.getPrototypeOf(o), Object.prototype);
var desc4 = Object.getOwnPropertyDescriptor(o, "__proto__");
assertTrue(desc4.configurable);
assertTrue(desc4.enumerable);
assertTrue(desc4.writable);
assertEquals(desc4.value, p);
}
TestDeleteProto();