1 // Copyright 2013 the V8 project authors. All rights reserved.
2 // Redistribution and use in source and binary forms, with or without
3 // modification, are permitted provided that the following conditions are
6 // * Redistributions of source code must retain the above copyright
7 // notice, this list of conditions and the following disclaimer.
8 // * Redistributions in binary form must reproduce the above
9 // copyright notice, this list of conditions and the following
10 // disclaimer in the documentation and/or other materials provided
11 // with the distribution.
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13 // contributors may be used to endorse or promote products derived
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16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 // Flags: --harmony-scoping --allow-natives-syntax --harmony-tostring
30 // Test instantations of generators.
32 // Generators shouldn't allocate stack slots. This test will abort in debug
33 // mode if generators have stack slots.
34 function TestContextAllocation() {
35 function* g1(a, b, c) { yield 1; return [a, b, c]; }
36 function* g2() { yield 1; return arguments; }
37 function* g3() { yield 1; return this; }
38 function* g4() { var x = 10; yield 1; return x; }
39 // Temporary variable context allocation
40 function* g5(l) { "use strict"; yield 1; for (let x in l) { yield x; } }
48 TestContextAllocation();
51 // Test the properties and prototype of a generator object.
52 function TestGeneratorObject() {
53 function* g() { yield 1; }
56 assertSame(g.prototype, Object.getPrototypeOf(iter));
57 assertTrue(iter instanceof g);
58 assertEquals("Generator", %_ClassOf(iter));
59 assertEquals("[object Generator]", String(iter));
60 assertEquals([], Object.getOwnPropertyNames(iter));
61 assertTrue(iter !== g());
63 // g() is the same as new g().
65 assertSame(g.prototype, Object.getPrototypeOf(iter));
66 assertTrue(iter instanceof g);
67 assertEquals("Generator", %_ClassOf(iter));
68 assertEquals("[object Generator]", String(iter));
69 assertEquals("[object Generator]", Object.prototype.toString.call(iter));
70 var gf = iter.__proto__.constructor;
71 assertEquals("[object GeneratorFunction]", Object.prototype.toString.call(gf));
72 assertEquals([], Object.getOwnPropertyNames(iter));
73 assertTrue(iter !== new g());
75 TestGeneratorObject();
78 // Test the methods of generator objects.
79 function TestGeneratorObjectMethods() {
80 function* g() { yield 1; }
83 function TestNonGenerator(non_generator) {
84 assertThrows(function() { iter.next.call(non_generator); }, TypeError);
85 assertThrows(function() { iter.next.call(non_generator, 1); }, TypeError);
86 assertThrows(function() { iter.throw.call(non_generator, 1); }, TypeError);
87 assertThrows(function() { iter.close.call(non_generator); }, TypeError);
92 TestNonGenerator(function(){});
94 TestNonGenerator(g.prototype);
96 TestGeneratorObjectMethods();