v8/test/mjsunit/es6/arguments-iterator.js

228 lines
6.4 KiB
JavaScript

// Copyright 2014 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Flags: --allow-natives-syntax
// Note in general that "arguments.foo" and "var o = arguments; o.foo"
// are treated differently by full-codegen, and so both cases need to be
// tested.
function TestDirectArgumentsIteratorProperty() {
assertTrue(arguments.hasOwnProperty(Symbol.iterator));
assertFalse(arguments.propertyIsEnumerable(Symbol.iterator));
var descriptor = Object.getOwnPropertyDescriptor(arguments, Symbol.iterator);
assertTrue(descriptor.writable);
assertFalse(descriptor.enumerable);
assertTrue(descriptor.configurable);
assertEquals(descriptor.value, [][Symbol.iterator]);
assertEquals(arguments[Symbol.iterator], [][Symbol.iterator]);
}
TestDirectArgumentsIteratorProperty();
function TestIndirectArgumentsIteratorProperty() {
var o = arguments;
assertTrue(o.hasOwnProperty(Symbol.iterator));
assertFalse(o.propertyIsEnumerable(Symbol.iterator));
assertEquals(o[Symbol.iterator], [][Symbol.iterator]);
}
TestIndirectArgumentsIteratorProperty();
function assertIteratorResult(value, done, result) {
assertEquals({value: value, done: done}, result);
}
function TestDirectValues1(a, b, c) {
var iterator = arguments[Symbol.iterator]();
assertIteratorResult(a, false, iterator.next());
assertIteratorResult(b, false, iterator.next());
assertIteratorResult(c, false, iterator.next());
assertIteratorResult(undefined, true, iterator.next());
}
TestDirectValues1(1, 2, 3);
function TestIndirectValues1(a, b, c) {
var args = arguments;
var iterator = args[Symbol.iterator]();
assertIteratorResult(a, false, iterator.next());
assertIteratorResult(b, false, iterator.next());
assertIteratorResult(c, false, iterator.next());
assertIteratorResult(undefined, true, iterator.next());
}
TestIndirectValues1(1, 2, 3);
function TestDirectValues2(a, b, c) {
var iterator = arguments[Symbol.iterator]();
assertIteratorResult(a, false, iterator.next());
assertIteratorResult(b, false, iterator.next());
assertIteratorResult(c, false, iterator.next());
assertIteratorResult(undefined, true, iterator.next());
arguments[3] = 4;
arguments.length = 4;
assertIteratorResult(undefined, true, iterator.next());
}
TestDirectValues2(1, 2, 3);
function TestIndirectValues2(a, b, c) {
var args = arguments;
var iterator = args[Symbol.iterator]();
assertIteratorResult(a, false, iterator.next());
assertIteratorResult(b, false, iterator.next());
assertIteratorResult(c, false, iterator.next());
assertIteratorResult(undefined, true, iterator.next());
arguments[3] = 4;
arguments.length = 4;
assertIteratorResult(undefined, true, iterator.next());
}
TestIndirectValues2(1, 2, 3);
function TestDirectValues3(a, b, c) {
var iterator = arguments[Symbol.iterator]();
assertIteratorResult(a, false, iterator.next());
assertIteratorResult(b, false, iterator.next());
arguments.length = 2;
assertIteratorResult(undefined, true, iterator.next());
}
TestDirectValues3(1, 2, 3);
function TestIndirectValues3(a, b, c) {
var args = arguments;
var iterator = args[Symbol.iterator]();
assertIteratorResult(a, false, iterator.next());
assertIteratorResult(b, false, iterator.next());
arguments.length = 2;
assertIteratorResult(undefined, true, iterator.next());
}
TestIndirectValues3(1, 2, 3);
function TestDirectValues4(a, b, c) {
var iterator = arguments[Symbol.iterator]();
assertIteratorResult(a, false, iterator.next());
assertIteratorResult(b, false, iterator.next());
assertIteratorResult(c, false, iterator.next());
arguments.length = 4;
assertIteratorResult(undefined, false, iterator.next());
assertIteratorResult(undefined, true, iterator.next());
}
TestDirectValues4(1, 2, 3);
function TestIndirectValues4(a, b, c) {
var args = arguments;
var iterator = args[Symbol.iterator]();
assertIteratorResult(a, false, iterator.next());
assertIteratorResult(b, false, iterator.next());
assertIteratorResult(c, false, iterator.next());
arguments.length = 4;
assertIteratorResult(undefined, false, iterator.next());
assertIteratorResult(undefined, true, iterator.next());
}
TestIndirectValues4(1, 2, 3);
function TestForOf() {
var i = 0;
for (var value of arguments) {
assertEquals(arguments[i++], value);
}
assertEquals(arguments.length, i);
}
TestForOf(1, 2, 3, 4, 5);
function TestAssignmentToIterator() {
var i = 0;
arguments[Symbol.iterator] = [].entries;
for (var entry of arguments) {
assertEquals([i, arguments[i]], entry);
i++;
}
assertEquals(arguments.length, i);
}
TestAssignmentToIterator(1, 2, 3, 4, 5);
function TestArgumentsMutation() {
var i = 0;
for (var x of arguments) {
assertEquals(arguments[i], x);
arguments[i+1] *= 2;
i++;
}
assertEquals(arguments.length, i);
}
TestArgumentsMutation(1, 2, 3, 4, 5);
function TestSloppyArgumentsAliasing(a0, a1, a2, a3, a4) {
var i = 0;
for (var x of arguments) {
assertEquals(arguments[i], x);
a0 = a1; a1 = a2; a3 = a4;
i++;
}
assertEquals(arguments.length, i);
}
TestSloppyArgumentsAliasing(1, 2, 3, 4, 5);
function TestStrictArgumentsAliasing(a0, a1, a2, a3, a4) {
"use strict";
var i = 0;
for (var x of arguments) {
a0 = a1; a1 = a2; a3 = a4;
assertEquals(arguments[i], x);
i++;
}
assertEquals(arguments.length, i);
}
TestStrictArgumentsAliasing(1, 2, 3, 4, 5);
function TestArgumentsAsProto() {
"use strict";
var o = {__proto__:arguments};
assertSame([][Symbol.iterator], o[Symbol.iterator]);
// Make o dict-mode.
%OptimizeObjectForAddingMultipleProperties(o, 0);
assertFalse(o.hasOwnProperty(Symbol.iterator));
assertSame([][Symbol.iterator], o[Symbol.iterator]);
o[Symbol.iterator] = 10;
assertTrue(o.hasOwnProperty(Symbol.iterator));
assertEquals(10, o[Symbol.iterator]);
assertSame([][Symbol.iterator], arguments[Symbol.iterator]);
// Frozen o.
o = Object.freeze({__proto__:arguments});
assertSame([][Symbol.iterator], o[Symbol.iterator]);
assertFalse(o.hasOwnProperty(Symbol.iterator));
assertSame([][Symbol.iterator], o[Symbol.iterator]);
assertThrows(function () { o[Symbol.iterator] = 10 });
assertFalse(o.hasOwnProperty(Symbol.iterator));
assertEquals([][Symbol.iterator], o[Symbol.iterator]);
assertSame([][Symbol.iterator], arguments[Symbol.iterator]);
}
TestArgumentsAsProto();