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
4// met:
5//
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8//     * Redistributions in binary form must reproduce the above
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26// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
28// Flags: --allow-natives-syntax --harmony-tostring
29
30// Test instantations of generators.
31
32// Generators shouldn't allocate stack slots.  This test will abort in debug
33// mode if generators have stack slots.
34function 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; } }
41
42  g1();
43  g2();
44  g3();
45  g4();
46  g5(["foo"]);
47}
48TestContextAllocation();
49
50
51// Test the properties and prototype of a generator object.
52function TestGeneratorObject() {
53  function* g() { yield 1; }
54
55  var iter = g();
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());
62
63  // g() is the same as new g().
64  iter = 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());
74}
75TestGeneratorObject();
76
77
78// Test the methods of generator objects.
79function TestGeneratorObjectMethods() {
80  function* g() { yield 1; }
81  var iter = g();
82
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  }
88
89  TestNonGenerator(1);
90  TestNonGenerator({});
91  TestNonGenerator(function(){});
92  TestNonGenerator(g);
93  TestNonGenerator(g.prototype);
94}
95TestGeneratorObjectMethods();
96