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.
5 // Flags: --allow-natives-syntax
8 // Note in general that "arguments.foo" and "var o = arguments; o.foo"
9 // are treated differently by full-codegen, and so both cases need to be
12 function TestDirectArgumentsIteratorProperty() {
13 assertTrue(arguments.hasOwnProperty(Symbol.iterator));
14 assertFalse(arguments.propertyIsEnumerable(Symbol.iterator));
15 var descriptor = Object.getOwnPropertyDescriptor(arguments, Symbol.iterator);
16 assertTrue(descriptor.writable);
17 assertFalse(descriptor.enumerable);
18 assertTrue(descriptor.configurable);
19 assertEquals(descriptor.value, [].values);
20 assertEquals(arguments[Symbol.iterator], [].values);
22 TestDirectArgumentsIteratorProperty();
25 function TestIndirectArgumentsIteratorProperty() {
27 assertTrue(o.hasOwnProperty(Symbol.iterator));
28 assertFalse(o.propertyIsEnumerable(Symbol.iterator));
29 assertEquals(o[Symbol.iterator], [].values);
31 TestIndirectArgumentsIteratorProperty();
34 function assertIteratorResult(value, done, result) {
35 assertEquals({value: value, done: done}, result);
39 function TestDirectValues1(a, b, c) {
40 var iterator = arguments[Symbol.iterator]();
41 assertIteratorResult(a, false, iterator.next());
42 assertIteratorResult(b, false, iterator.next());
43 assertIteratorResult(c, false, iterator.next());
44 assertIteratorResult(undefined, true, iterator.next());
46 TestDirectValues1(1, 2, 3);
49 function TestIndirectValues1(a, b, c) {
51 var iterator = args[Symbol.iterator]();
52 assertIteratorResult(a, false, iterator.next());
53 assertIteratorResult(b, false, iterator.next());
54 assertIteratorResult(c, false, iterator.next());
55 assertIteratorResult(undefined, true, iterator.next());
57 TestIndirectValues1(1, 2, 3);
60 function TestDirectValues2(a, b, c) {
61 var iterator = arguments[Symbol.iterator]();
62 assertIteratorResult(a, false, iterator.next());
63 assertIteratorResult(b, false, iterator.next());
64 assertIteratorResult(c, false, iterator.next());
65 assertIteratorResult(undefined, true, iterator.next());
69 assertIteratorResult(undefined, true, iterator.next());
71 TestDirectValues2(1, 2, 3);
74 function TestIndirectValues2(a, b, c) {
76 var iterator = args[Symbol.iterator]();
77 assertIteratorResult(a, false, iterator.next());
78 assertIteratorResult(b, false, iterator.next());
79 assertIteratorResult(c, false, iterator.next());
80 assertIteratorResult(undefined, true, iterator.next());
84 assertIteratorResult(undefined, true, iterator.next());
86 TestIndirectValues2(1, 2, 3);
89 function TestDirectValues3(a, b, c) {
90 var iterator = arguments[Symbol.iterator]();
91 assertIteratorResult(a, false, iterator.next());
92 assertIteratorResult(b, false, iterator.next());
95 assertIteratorResult(undefined, true, iterator.next());
97 TestDirectValues3(1, 2, 3);
100 function TestIndirectValues3(a, b, c) {
101 var args = arguments;
102 var iterator = args[Symbol.iterator]();
103 assertIteratorResult(a, false, iterator.next());
104 assertIteratorResult(b, false, iterator.next());
106 arguments.length = 2;
107 assertIteratorResult(undefined, true, iterator.next());
109 TestIndirectValues3(1, 2, 3);
112 function TestDirectValues4(a, b, c) {
113 var iterator = arguments[Symbol.iterator]();
114 assertIteratorResult(a, false, iterator.next());
115 assertIteratorResult(b, false, iterator.next());
116 assertIteratorResult(c, false, iterator.next());
118 arguments.length = 4;
119 assertIteratorResult(undefined, false, iterator.next());
120 assertIteratorResult(undefined, true, iterator.next());
122 TestDirectValues4(1, 2, 3);
125 function TestIndirectValues4(a, b, c) {
126 var args = arguments;
127 var iterator = args[Symbol.iterator]();
128 assertIteratorResult(a, false, iterator.next());
129 assertIteratorResult(b, false, iterator.next());
130 assertIteratorResult(c, false, iterator.next());
132 arguments.length = 4;
133 assertIteratorResult(undefined, false, iterator.next());
134 assertIteratorResult(undefined, true, iterator.next());
136 TestIndirectValues4(1, 2, 3);
139 function TestForOf() {
141 for (var value of arguments) {
142 assertEquals(arguments[i++], value);
145 assertEquals(arguments.length, i);
147 TestForOf(1, 2, 3, 4, 5);
150 function TestAssignmentToIterator() {
152 arguments[Symbol.iterator] = [].entries;
153 for (var entry of arguments) {
154 assertEquals([i, arguments[i]], entry);
158 assertEquals(arguments.length, i);
160 TestAssignmentToIterator(1, 2, 3, 4, 5);
163 function TestArgumentsMutation() {
165 for (var x of arguments) {
166 assertEquals(arguments[i], x);
171 assertEquals(arguments.length, i);
173 TestArgumentsMutation(1, 2, 3, 4, 5);
176 function TestSloppyArgumentsAliasing(a0, a1, a2, a3, a4) {
178 for (var x of arguments) {
179 assertEquals(arguments[i], x);
180 a0 = a1; a1 = a2; a3 = a4;
184 assertEquals(arguments.length, i);
186 TestSloppyArgumentsAliasing(1, 2, 3, 4, 5);
189 function TestStrictArgumentsAliasing(a0, a1, a2, a3, a4) {
192 for (var x of arguments) {
193 a0 = a1; a1 = a2; a3 = a4;
194 assertEquals(arguments[i], x);
198 assertEquals(arguments.length, i);
200 TestStrictArgumentsAliasing(1, 2, 3, 4, 5);
203 function TestArgumentsAsProto() {
206 var o = {__proto__:arguments};
207 assertSame([].values, o[Symbol.iterator]);
209 %OptimizeObjectForAddingMultipleProperties(o, 0);
210 assertFalse(o.hasOwnProperty(Symbol.iterator));
211 assertSame([].values, o[Symbol.iterator]);
212 o[Symbol.iterator] = 10;
213 assertTrue(o.hasOwnProperty(Symbol.iterator));
214 assertEquals(10, o[Symbol.iterator]);
215 assertSame([].values, arguments[Symbol.iterator]);
218 o = Object.freeze({__proto__:arguments});
219 assertSame([].values, o[Symbol.iterator]);
220 assertFalse(o.hasOwnProperty(Symbol.iterator));
221 assertSame([].values, o[Symbol.iterator]);
222 // This should throw, but currently it doesn't, because
223 // ExecutableAccessorInfo callbacks don't see the current strict mode.
224 // See note in accessors.cc:SetPropertyOnInstanceIfInherited.
225 o[Symbol.iterator] = 10;
226 assertFalse(o.hasOwnProperty(Symbol.iterator));
227 assertEquals([].values, o[Symbol.iterator]);
228 assertSame([].values, arguments[Symbol.iterator]);
230 TestArgumentsAsProto();