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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 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 "use strict"; | 5 "use strict"; |
6 | 6 |
7 // This file relies on the fact that the following declarations have been made | 7 // This file relies on the fact that the following declarations have been made |
8 // in runtime.js: | 8 // in runtime.js: |
9 // var $Function = global.Function; | 9 // var $Function = global.Function; |
10 | 10 |
11 // ---------------------------------------------------------------------------- | 11 // ---------------------------------------------------------------------------- |
12 | 12 |
13 | 13 |
14 // Generator functions and objects are specified by ES6, sections 15.19.3 and | 14 // Generator functions and objects are specified by ES6, sections 15.19.3 and |
15 // 15.19.4. | 15 // 15.19.4. |
16 | 16 |
17 function GeneratorObjectNext(value) { | 17 function GeneratorObjectNext(value) { |
18 if (!IS_GENERATOR(this)) { | 18 if (!IS_GENERATOR(this)) { |
19 throw MakeTypeError('incompatible_method_receiver', | 19 throw MakeTypeError('incompatible_method_receiver', |
20 ['[Generator].prototype.next', this]); | 20 ['[Generator].prototype.next', this]); |
21 } | 21 } |
22 | 22 |
23 if (DEBUG_IS_ACTIVE) %DebugPrepareStepInIfStepping(this); | 23 var continuation = %GeneratorGetContinuation(this); |
24 return %_GeneratorNext(this, value); | 24 if (continuation > 0) { |
| 25 // Generator is suspended. |
| 26 if (DEBUG_IS_ACTIVE) %DebugPrepareStepInIfStepping(this); |
| 27 try { |
| 28 return %_GeneratorNext(this, value); |
| 29 } catch (e) { |
| 30 %GeneratorClose(this); |
| 31 throw e; |
| 32 } |
| 33 } else if (continuation == 0) { |
| 34 // Generator is already closed. |
| 35 return { value: void 0, done: true }; |
| 36 } else { |
| 37 // Generator is running. |
| 38 throw MakeTypeError('generator_running', []); |
| 39 } |
25 } | 40 } |
26 | 41 |
27 function GeneratorObjectThrow(exn) { | 42 function GeneratorObjectThrow(exn) { |
28 if (!IS_GENERATOR(this)) { | 43 if (!IS_GENERATOR(this)) { |
29 throw MakeTypeError('incompatible_method_receiver', | 44 throw MakeTypeError('incompatible_method_receiver', |
30 ['[Generator].prototype.throw', this]); | 45 ['[Generator].prototype.throw', this]); |
31 } | 46 } |
32 | 47 |
33 return %_GeneratorThrow(this, exn); | 48 var continuation = %GeneratorGetContinuation(this); |
| 49 if (continuation > 0) { |
| 50 // Generator is suspended. |
| 51 try { |
| 52 return %_GeneratorThrow(this, exn); |
| 53 } catch (e) { |
| 54 %GeneratorClose(this); |
| 55 throw e; |
| 56 } |
| 57 } else if (continuation == 0) { |
| 58 // Generator is already closed. |
| 59 throw exn; |
| 60 } else { |
| 61 // Generator is running. |
| 62 throw MakeTypeError('generator_running', []); |
| 63 } |
34 } | 64 } |
35 | 65 |
36 function GeneratorObjectIterator() { | 66 function GeneratorObjectIterator() { |
37 return this; | 67 return this; |
38 } | 68 } |
39 | 69 |
40 function GeneratorFunctionPrototypeConstructor(x) { | 70 function GeneratorFunctionPrototypeConstructor(x) { |
41 if (%_IsConstructCall()) { | 71 if (%_IsConstructCall()) { |
42 throw MakeTypeError('not_constructor', ['GeneratorFunctionPrototype']); | 72 throw MakeTypeError('not_constructor', ['GeneratorFunctionPrototype']); |
43 } | 73 } |
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78 symbolToStringTag, "Generator", DONT_ENUM | READ_ONLY); | 108 symbolToStringTag, "Generator", DONT_ENUM | READ_ONLY); |
79 %InternalSetPrototype(GeneratorFunctionPrototype, $Function.prototype); | 109 %InternalSetPrototype(GeneratorFunctionPrototype, $Function.prototype); |
80 %SetCode(GeneratorFunctionPrototype, GeneratorFunctionPrototypeConstructor); | 110 %SetCode(GeneratorFunctionPrototype, GeneratorFunctionPrototypeConstructor); |
81 %AddNamedProperty(GeneratorFunctionPrototype, "constructor", | 111 %AddNamedProperty(GeneratorFunctionPrototype, "constructor", |
82 GeneratorFunction, DONT_ENUM | DONT_DELETE | READ_ONLY); | 112 GeneratorFunction, DONT_ENUM | DONT_DELETE | READ_ONLY); |
83 %InternalSetPrototype(GeneratorFunction, $Function); | 113 %InternalSetPrototype(GeneratorFunction, $Function); |
84 %SetCode(GeneratorFunction, GeneratorFunctionConstructor); | 114 %SetCode(GeneratorFunction, GeneratorFunctionConstructor); |
85 } | 115 } |
86 | 116 |
87 SetUpGenerators(); | 117 SetUpGenerators(); |
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