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160 lines
5.0 KiB
160 lines
5.0 KiB
// Copyright 2014 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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// Flags: --allow-natives-syntax
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var typedArrayConstructors = [
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Uint8Array,
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Int8Array,
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Uint16Array,
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Int16Array,
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Uint32Array,
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Int32Array,
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Uint8ClampedArray,
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Float32Array,
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Float64Array];
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function CheckTypedArrayIsNeutered(array) {
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assertEquals(0, array.byteLength);
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assertEquals(0, array.byteOffset);
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assertEquals(0, array.length);
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}
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function TestTypedArrayForEach(constructor) {
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assertEquals(1, constructor.prototype.forEach.length);
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var a = new constructor(2);
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a[0] = 0;
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a[1] = 1;
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var count = 0;
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a.forEach(function (n) { count++; });
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assertEquals(2, count);
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// Use specified object as this object when calling the function.
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var o = { value: 42 };
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var result = [];
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a.forEach(function (n, index, array) { result.push(this.value); }, o);
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assertArrayEquals([42, 42], result);
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// Modify the original array.
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count = 0;
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a.forEach(function (n, index, array) { array[index] = n + 1; count++ });
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assertEquals(2, count);
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assertArrayEquals([1, 2], a);
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// Check that values passed as second argument are wrapped into
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// objects when calling into sloppy mode functions.
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function CheckWrapping(value, wrapper) {
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var wrappedValue = new wrapper(value);
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a.forEach(function () {
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assertEquals("object", typeof this);
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assertEquals(wrappedValue, this);
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}, value);
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a.forEach(function () {
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"use strict";
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assertEquals(typeof value, typeof this);
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assertEquals(value, this);
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}, value);
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}
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CheckWrapping(true, Boolean);
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CheckWrapping(false, Boolean);
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CheckWrapping("xxx", String);
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CheckWrapping(42, Number);
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CheckWrapping(3.14, Number);
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CheckWrapping({}, Object);
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// Throw before completing iteration, only the first element
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// should be modified when thorwing mid-way.
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count = 0;
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a[0] = 42;
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a[1] = 42;
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try {
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a.forEach(function (n, index, array) {
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if (count > 0) throw "meh";
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array[index] = n + 1;
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count++;
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});
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} catch (e) {
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}
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assertEquals(1, count);
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assertEquals(43, a[0]);
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assertEquals(42, a[1]);
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// Neutering the buffer backing the typed array mid-way should
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// still make .forEach() finish, but exiting early due to the missing
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// elements, and the array should keep being empty after detaching it.
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// TODO(dehrenberg): According to the ES6 spec, accessing or testing
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// for members on a detached TypedArray should throw, so really this
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// should throw in the third iteration. However, this behavior matches
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// the Khronos spec.
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a = new constructor(3);
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count = 0;
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a.forEach(function (n, index, array) {
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if (count > 0) %ArrayBufferNeuter(array.buffer);
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array[index] = n + 1;
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count++;
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});
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assertEquals(2, count);
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CheckTypedArrayIsNeutered(a);
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assertEquals(undefined, a[0]);
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// The method must work for typed arrays created from ArrayBuffer.
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// The length of the ArrayBuffer is chosen so it is a multiple of
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// all lengths of the typed array items.
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a = new constructor(new ArrayBuffer(64));
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count = 0;
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a.forEach(function (n) { count++ });
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assertEquals(a.length, count);
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// Externalizing the array mid-way accessing the .buffer property
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// should work.
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a = new constructor(2);
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count = 0;
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var buffer = undefined;
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a.forEach(function (n, index, array) {
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if (count++ > 0)
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buffer = array.buffer;
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});
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assertEquals(2, count);
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assertTrue(!!buffer);
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assertEquals("ArrayBuffer", %_ClassOf(buffer));
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assertSame(buffer, a.buffer);
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// The %TypedArray%.forEach() method should not work when
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// transplanted to objects that are not typed arrays.
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assertThrows(function () { constructor.prototype.forEach.call([1, 2, 3], function (x) {}) }, TypeError);
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assertThrows(function () { constructor.prototype.forEach.call("abc", function (x) {}) }, TypeError);
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assertThrows(function () { constructor.prototype.forEach.call({}, function (x) {}) }, TypeError);
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assertThrows(function () { constructor.prototype.forEach.call(0, function (x) {}) }, TypeError);
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// Method must be useable on instances of other typed arrays.
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for (var i = 0; i < typedArrayConstructors.length; i++) {
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count = 0;
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a = new typedArrayConstructors[i](4);
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constructor.prototype.forEach.call(a, function (x) { count++ });
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assertEquals(a.length, count);
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}
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// Shadowing length doesn't affect forEach, unlike Array.prototype.forEach
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a = new constructor([1, 2]);
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Object.defineProperty(a, 'length', {value: 1});
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var x = 0;
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assertEquals(a.forEach(function(elt) { x += elt; }), undefined);
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assertEquals(x, 3);
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assertEquals(Array.prototype.forEach.call(a,
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function(elt) { x += elt; }), undefined);
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assertEquals(x, 4);
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// Detached Operation
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var array = new constructor([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);
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%ArrayBufferNeuter(array.buffer);
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assertThrows(() => array.forEach(() => true), TypeError);
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}
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for (i = 0; i < typedArrayConstructors.length; i++) {
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TestTypedArrayForEach(typedArrayConstructors[i]);
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}
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