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1 // Copyright 2013 the V8 project authors. All rights reserved. | 1 // Copyright 2013 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | 23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | 24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | 25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | 26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | 27 |
28 // Test aspects of the generator runtime. | 28 // Test aspects of the generator runtime. |
29 | 29 |
30 // See: | 30 // See: |
31 // http://people.mozilla.org/~jorendorff/es6-draft.html#sec-generatorfunction-ob
jects | 31 // http://people.mozilla.org/~jorendorff/es6-draft.html#sec-generatorfunction-ob
jects |
32 | 32 |
33 function f() { } | 33 function f() { "use strict"; } |
34 function* g() { yield 1; } | 34 function* g() { yield 1; } |
35 var GeneratorFunctionPrototype = Object.getPrototypeOf(g); | 35 var GeneratorFunctionPrototype = Object.getPrototypeOf(g); |
36 var GeneratorFunction = GeneratorFunctionPrototype.constructor; | 36 var GeneratorFunction = GeneratorFunctionPrototype.constructor; |
37 var GeneratorObjectPrototype = GeneratorFunctionPrototype.prototype; | 37 var GeneratorObjectPrototype = GeneratorFunctionPrototype.prototype; |
38 | 38 |
39 // A generator function should have the same set of properties as any | 39 // A generator function should have the same set of properties as any |
40 // other function. | 40 // other function. |
41 function TestGeneratorFunctionInstance() { | 41 function TestGeneratorFunctionInstance() { |
42 var f_own_property_names = Object.getOwnPropertyNames(f); | 42 var f_own_property_names = Object.getOwnPropertyNames(f); |
43 var g_own_property_names = Object.getOwnPropertyNames(g); | 43 var g_own_property_names = Object.getOwnPropertyNames(g); |
44 | 44 |
45 f_own_property_names.sort(); | 45 f_own_property_names.sort(); |
46 g_own_property_names.sort(); | 46 g_own_property_names.sort(); |
47 | 47 |
48 assertArrayEquals(f_own_property_names, g_own_property_names); | 48 assertArrayEquals(f_own_property_names, g_own_property_names); |
49 var i; | 49 var i; |
50 for (i = 0; i < f_own_property_names.length; i++) { | 50 for (i = 0; i < f_own_property_names.length; i++) { |
51 var prop = f_own_property_names[i]; | 51 var prop = f_own_property_names[i]; |
52 var f_desc = Object.getOwnPropertyDescriptor(f, prop); | 52 var f_desc = Object.getOwnPropertyDescriptor(f, prop); |
53 var g_desc = Object.getOwnPropertyDescriptor(g, prop); | 53 var g_desc = Object.getOwnPropertyDescriptor(g, prop); |
54 assertEquals(f_desc.configurable, g_desc.configurable, prop); | 54 if (prop === "prototype") { |
55 if (prop === 'arguments' || prop === 'caller') { | 55 // ES6 draft 03-17-2015 section 25.2.2.2 |
56 // Unlike sloppy functions, which have read-only data arguments and caller | 56 assertFalse(g_desc.writable, prop); |
57 // properties, sloppy generators have a poison pill implemented via | 57 assertFalse(g_desc.enumerable, prop); |
58 // accessors | 58 assertFalse(g_desc.configurable, prop); |
59 assertFalse('writable' in g_desc, prop); | |
60 assertTrue(g_desc.get instanceof Function, prop); | |
61 assertEquals(g_desc.get, g_desc.set, prop); | |
62 } else { | 59 } else { |
| 60 assertEquals(f_desc.configurable, g_desc.configurable, prop); |
63 assertEquals(f_desc.writable, g_desc.writable, prop); | 61 assertEquals(f_desc.writable, g_desc.writable, prop); |
| 62 assertEquals(f_desc.enumerable, g_desc.enumerable, prop); |
64 } | 63 } |
65 assertEquals(f_desc.enumerable, g_desc.enumerable, prop); | |
66 } | 64 } |
67 } | 65 } |
68 TestGeneratorFunctionInstance(); | 66 TestGeneratorFunctionInstance(); |
69 | 67 |
70 | 68 |
71 // Generators have an additional object interposed in the chain between | 69 // Generators have an additional object interposed in the chain between |
72 // themselves and Function.prototype. | 70 // themselves and Function.prototype. |
73 function TestGeneratorFunctionPrototype() { | 71 function TestGeneratorFunctionPrototype() { |
74 // Sanity check. | 72 // Sanity check. |
75 assertSame(Object.getPrototypeOf(f), Function.prototype); | 73 assertSame(Object.getPrototypeOf(f), Function.prototype); |
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153 function TestPerGeneratorPrototype() { | 151 function TestPerGeneratorPrototype() { |
154 assertTrue((function*(){}).prototype !== (function*(){}).prototype); | 152 assertTrue((function*(){}).prototype !== (function*(){}).prototype); |
155 assertTrue((function*(){}).prototype !== g.prototype); | 153 assertTrue((function*(){}).prototype !== g.prototype); |
156 assertSame(GeneratorObjectPrototype, Object.getPrototypeOf(g.prototype)); | 154 assertSame(GeneratorObjectPrototype, Object.getPrototypeOf(g.prototype)); |
157 assertTrue(!(g.prototype instanceof Function)); | 155 assertTrue(!(g.prototype instanceof Function)); |
158 assertSame(typeof (g.prototype), "object"); | 156 assertSame(typeof (g.prototype), "object"); |
159 | 157 |
160 assertArrayEquals([], Object.getOwnPropertyNames(g.prototype)); | 158 assertArrayEquals([], Object.getOwnPropertyNames(g.prototype)); |
161 } | 159 } |
162 TestPerGeneratorPrototype(); | 160 TestPerGeneratorPrototype(); |
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