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| 1 // Copyright 2015 the V8 project authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 function getStrictF() { |
| 6 'use strict'; |
| 7 return function f(x) {}; |
| 8 } |
| 9 |
| 10 |
| 11 function getSloppyF() { |
| 12 return function f(x) {}; |
| 13 } |
| 14 |
| 15 |
| 16 function getStrictGenerator() { |
| 17 'use strict'; |
| 18 return function* f(x) {}; |
| 19 } |
| 20 |
| 21 |
| 22 function getSloppyGenerator() { |
| 23 return function* f(x) {}; |
| 24 } |
| 25 |
| 26 |
| 27 function test(testFunction) { |
| 28 testFunction(getStrictF()); |
| 29 testFunction(getSloppyF()); |
| 30 testFunction(getStrictGenerator()); |
| 31 testFunction(getSloppyGenerator()); |
| 32 } |
| 33 |
| 34 |
| 35 function testDescriptor(f) { |
| 36 var descr = Object.getOwnPropertyDescriptor(f, 'length'); |
| 37 assertTrue(descr.configurable); |
| 38 assertFalse(descr.enumerable); |
| 39 assertEquals(1, descr.value); |
| 40 assertFalse(descr.writable); |
| 41 } |
| 42 test(testDescriptor); |
| 43 |
| 44 |
| 45 function testSet(f) { |
| 46 f.length = 2; |
| 47 assertEquals(1, f.length); |
| 48 } |
| 49 test(testSet); |
| 50 |
| 51 |
| 52 function testSetStrict(f) { |
| 53 'use strict'; |
| 54 assertThrows(function() { |
| 55 f.length = 2; |
| 56 }, TypeError); |
| 57 } |
| 58 test(testSetStrict); |
| 59 |
| 60 |
| 61 function testReconfigureAsDataProperty(f) { |
| 62 Object.defineProperty(f, 'length', { |
| 63 value: 2, |
| 64 }); |
| 65 assertEquals(2, f.length); |
| 66 Object.defineProperty(f, 'length', { |
| 67 writable: true |
| 68 }); |
| 69 f.length = 3; |
| 70 assertEquals(3, f.length); |
| 71 |
| 72 f.length = 42; |
| 73 assertEquals(42, f.length); |
| 74 } |
| 75 test(testReconfigureAsDataProperty); |
| 76 |
| 77 |
| 78 function testReconfigureAsAccessorProperty(f) { |
| 79 var length = 2; |
| 80 Object.defineProperty(f, 'length', { |
| 81 get: function() { return length; }, |
| 82 set: function(v) { length = v; } |
| 83 }); |
| 84 assertEquals(2, f.length); |
| 85 f.length = 3; |
| 86 assertEquals(3, f.length); |
| 87 } |
| 88 test(testReconfigureAsAccessorProperty); |
| 89 |
| 90 |
| 91 (function testSetOnInstance() { |
| 92 // This needs to come before testDelete below |
| 93 assertTrue(Function.prototype.hasOwnProperty('length')); |
| 94 |
| 95 function f() {} |
| 96 delete f.length; |
| 97 assertEquals(0, f.length); |
| 98 |
| 99 f.length = 42; |
| 100 assertEquals(0, f.length); // non writable prototype property. |
| 101 assertFalse(f.hasOwnProperty('length')); |
| 102 |
| 103 Object.defineProperty(Function.prototype, 'length', {writable: true}); |
| 104 |
| 105 f.length = 123; |
| 106 assertTrue(f.hasOwnProperty('length')); |
| 107 assertEquals(123, f.length); |
| 108 })(); |
| 109 |
| 110 |
| 111 (function testDelete() { |
| 112 function f(x) {} |
| 113 assertTrue(delete f.length); |
| 114 assertFalse(f.hasOwnProperty('length')); |
| 115 assertEquals(0, f.length); |
| 116 |
| 117 assertTrue(delete Function.prototype.length); |
| 118 assertEquals(undefined, f.length); |
| 119 })(); |
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