Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1 | // Copyright 2014 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 | // Flags: --allow-natives-syntax |
| 6 | |
| 7 | var typedArrayConstructors = [ |
| 8 | Uint8Array, |
| 9 | Int8Array, |
| 10 | Uint16Array, |
| 11 | Int16Array, |
| 12 | Uint32Array, |
| 13 | Int32Array, |
| 14 | Uint8ClampedArray, |
| 15 | Float32Array, |
| 16 | Float64Array]; |
| 17 | |
| 18 | function CheckTypedArrayIsNeutered(array) { |
| 19 | assertEquals(0, array.byteLength); |
| 20 | assertEquals(0, array.byteOffset); |
| 21 | assertEquals(0, array.length); |
| 22 | } |
| 23 | |
| 24 | function TestTypedArrayForEach(constructor) { |
| 25 | assertEquals(1, constructor.prototype.forEach.length); |
| 26 | |
| 27 | var a = new constructor(2); |
| 28 | a[0] = 0; |
| 29 | a[1] = 1; |
| 30 | |
| 31 | var count = 0; |
| 32 | a.forEach(function (n) { count++; }); |
| 33 | assertEquals(2, count); |
| 34 | |
| 35 | // Use specified object as this object when calling the function. |
| 36 | var o = { value: 42 }; |
| 37 | var result = []; |
| 38 | a.forEach(function (n, index, array) { result.push(this.value); }, o); |
| 39 | assertArrayEquals([42, 42], result); |
| 40 | |
| 41 | // Modify the original array. |
| 42 | count = 0; |
| 43 | a.forEach(function (n, index, array) { array[index] = n + 1; count++ }); |
| 44 | assertEquals(2, count); |
| 45 | assertArrayEquals([1, 2], a); |
| 46 | |
| 47 | // Check that values passed as second argument are wrapped into |
| 48 | // objects when calling into sloppy mode functions. |
| 49 | function CheckWrapping(value, wrapper) { |
| 50 | var wrappedValue = new wrapper(value); |
| 51 | |
| 52 | a.forEach(function () { |
| 53 | assertEquals("object", typeof this); |
| 54 | assertEquals(wrappedValue, this); |
| 55 | }, value); |
| 56 | |
| 57 | a.forEach(function () { |
| 58 | "use strict"; |
| 59 | assertEquals(typeof value, typeof this); |
| 60 | assertEquals(value, this); |
| 61 | }, value); |
| 62 | } |
| 63 | CheckWrapping(true, Boolean); |
| 64 | CheckWrapping(false, Boolean); |
| 65 | CheckWrapping("xxx", String); |
| 66 | CheckWrapping(42, Number); |
| 67 | CheckWrapping(3.14, Number); |
| 68 | CheckWrapping({}, Object); |
| 69 | |
| 70 | // Throw before completing iteration, only the first element |
| 71 | // should be modified when thorwing mid-way. |
| 72 | count = 0; |
| 73 | a[0] = 42; |
| 74 | a[1] = 42; |
| 75 | try { |
| 76 | a.forEach(function (n, index, array) { |
| 77 | if (count > 0) throw "meh"; |
| 78 | array[index] = n + 1; |
| 79 | count++; |
| 80 | }); |
| 81 | } catch (e) { |
| 82 | } |
| 83 | assertEquals(1, count); |
| 84 | assertEquals(43, a[0]); |
| 85 | assertEquals(42, a[1]); |
| 86 | |
| 87 | // Neutering the buffer backing the typed array mid-way should |
| 88 | // still make .forEach() finish, but exiting early due to the missing |
| 89 | // elements, and the array should keep being empty after detaching it. |
| 90 | // TODO(dehrenberg): According to the ES6 spec, accessing or testing |
| 91 | // for members on a detached TypedArray should throw, so really this |
| 92 | // should throw in the third iteration. However, this behavior matches |
| 93 | // the Khronos spec. |
| 94 | a = new constructor(3); |
| 95 | count = 0; |
| 96 | a.forEach(function (n, index, array) { |
| 97 | if (count > 0) %ArrayBufferNeuter(array.buffer); |
| 98 | array[index] = n + 1; |
| 99 | count++; |
| 100 | }); |
| 101 | assertEquals(2, count); |
| 102 | CheckTypedArrayIsNeutered(a); |
| 103 | assertEquals(undefined, a[0]); |
| 104 | |
| 105 | // The method must work for typed arrays created from ArrayBuffer. |
| 106 | // The length of the ArrayBuffer is chosen so it is a multiple of |
| 107 | // all lengths of the typed array items. |
| 108 | a = new constructor(new ArrayBuffer(64)); |
| 109 | count = 0; |
| 110 | a.forEach(function (n) { count++ }); |
| 111 | assertEquals(a.length, count); |
| 112 | |
| 113 | // Externalizing the array mid-way accessing the .buffer property |
| 114 | // should work. |
| 115 | a = new constructor(2); |
| 116 | count = 0; |
| 117 | var buffer = undefined; |
| 118 | a.forEach(function (n, index, array) { |
| 119 | if (count++ > 0) |
| 120 | buffer = array.buffer; |
| 121 | }); |
| 122 | assertEquals(2, count); |
| 123 | assertTrue(!!buffer); |
| 124 | assertEquals("ArrayBuffer", %_ClassOf(buffer)); |
| 125 | assertSame(buffer, a.buffer); |
| 126 | |
| 127 | // The %TypedArray%.forEach() method should not work when |
| 128 | // transplanted to objects that are not typed arrays. |
| 129 | assertThrows(function () { constructor.prototype.forEach.call([1, 2, 3], function (x) {}) }, TypeError); |
| 130 | assertThrows(function () { constructor.prototype.forEach.call("abc", function (x) {}) }, TypeError); |
| 131 | assertThrows(function () { constructor.prototype.forEach.call({}, function (x) {}) }, TypeError); |
| 132 | assertThrows(function () { constructor.prototype.forEach.call(0, function (x) {}) }, TypeError); |
| 133 | |
| 134 | // Method must be useable on instances of other typed arrays. |
| 135 | for (var i = 0; i < typedArrayConstructors.length; i++) { |
| 136 | count = 0; |
| 137 | a = new typedArrayConstructors[i](4); |
| 138 | constructor.prototype.forEach.call(a, function (x) { count++ }); |
| 139 | assertEquals(a.length, count); |
| 140 | } |
| 141 | |
| 142 | // Shadowing length doesn't affect forEach, unlike Array.prototype.forEach |
| 143 | a = new constructor([1, 2]); |
| 144 | Object.defineProperty(a, 'length', {value: 1}); |
| 145 | var x = 0; |
| 146 | assertEquals(a.forEach(function(elt) { x += elt; }), undefined); |
| 147 | assertEquals(x, 3); |
| 148 | assertEquals(Array.prototype.forEach.call(a, |
| 149 | function(elt) { x += elt; }), undefined); |
| 150 | assertEquals(x, 4); |
| 151 | } |
| 152 | |
| 153 | for (i = 0; i < typedArrayConstructors.length; i++) { |
| 154 | TestTypedArrayForEach(typedArrayConstructors[i]); |
| 155 | } |