f6cd009efd
Function name property is now standardized in ES6. It was a Mozilla proprietary extension before. With ES6, the property was made configurable, so that it can be used instead of another proprietary property, displayName. This is a revert of revertc791d84112. Last time this broke a Chrome browser test which has since been updated:5f75a3be4cBUG=v8:3333 LOG=N R=mstarzinger@chromium.org,verwaest@chromium.org CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:linux_chromium_rel_ng;tryserver.blink:linux_blink_rel Review URL: https://codereview.chromium.org/977003004 Cr-Commit-Position: refs/heads/master@{#26996}
116 lines
2.4 KiB
JavaScript
116 lines
2.4 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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function getStrictF() {
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'use strict';
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return function f() {};
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}
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function getSloppyF() {
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return function f() {};
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}
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function test(testFunction) {
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testFunction(getStrictF());
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testFunction(getSloppyF());
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}
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function testDescriptor(f) {
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var descr = Object.getOwnPropertyDescriptor(f, 'name');
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assertTrue(descr.configurable);
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assertFalse(descr.enumerable);
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assertEquals('f', descr.value);
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assertFalse(descr.writable);
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}
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test(testDescriptor);
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function testSet(f) {
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f.name = 'g';
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assertEquals('f', f.name);
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}
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test(testSet);
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function testSetStrict(f) {
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'use strict';
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assertThrows(function() {
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f.name = 'g';
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}, TypeError);
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}
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test(testSetStrict);
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function testReconfigureAsDataProperty(f) {
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Object.defineProperty(f, 'name', {
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value: 'g',
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});
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assertEquals('g', f.name);
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Object.defineProperty(f, 'name', {
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writable: true
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});
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f.name = 'h';
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assertEquals('h', f.name);
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f.name = 42;
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assertEquals(42, f.name);
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}
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test(testReconfigureAsDataProperty);
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function testReconfigureAsAccessorProperty(f) {
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var name = 'g';
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Object.defineProperty(f, 'name', {
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get: function() { return name; },
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set: function(v) { name = v; }
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});
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assertEquals('g', f.name);
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f.name = 'h';
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assertEquals('h', f.name);
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}
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test(testReconfigureAsAccessorProperty);
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function testFunctionToString(f) {
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Object.defineProperty(f, 'name', {
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value: {toString: function() { assertUnreachable(); }},
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});
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assertEquals('function f() {}', f.toString());
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}
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test(testFunctionToString);
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(function testSetOnInstance() {
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// This needs to come before testDelete below
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assertTrue(Function.prototype.hasOwnProperty('name'));
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function f() {}
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delete f.name;
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assertEquals('Empty', f.name);
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f.name = 42;
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assertEquals('Empty', f.name); // non writable prototype property.
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assertFalse(f.hasOwnProperty('name'));
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Object.defineProperty(Function.prototype, 'name', {writable: true});
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f.name = 123;
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assertTrue(f.hasOwnProperty('name'));
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assertEquals(123, f.name);
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})();
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(function testDelete() {
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function f() {}
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assertTrue(delete f.name);
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assertFalse(f.hasOwnProperty('name'));
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assertEquals('Empty', f.name);
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assertTrue(delete Function.prototype.name);
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assertEquals(undefined, f.name);
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})();
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