Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 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 | // |
| 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. |
| 12 | // * Neither the name of Google Inc. nor the names of its |
| 13 | // contributors may be used to endorse or promote products derived |
| 14 | // from this software without specific prior written permission. |
| 15 | // |
| 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 |
| 19 | // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 20 | // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 21 | // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 22 | // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 | // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 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. |
| 27 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 28 | // Flags: --allow-natives-syntax |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 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. |
| 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; } } |
| 41 | |
| 42 | g1(); |
| 43 | g2(); |
| 44 | g3(); |
| 45 | g4(); |
| 46 | g5(["foo"]); |
| 47 | } |
| 48 | TestContextAllocation(); |
| 49 | |
| 50 | |
| 51 | // Test the properties and prototype of a generator object. |
| 52 | function 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()); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 62 | assertEquals("[object Generator]", Object.prototype.toString.call(iter)); |
| 63 | var gf = iter.__proto__.constructor; |
| 64 | assertEquals("[object GeneratorFunction]", Object.prototype.toString.call(gf)); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 65 | |
| 66 | // generators are not constructable. |
| 67 | assertThrows(()=>new g()); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 68 | } |
| 69 | TestGeneratorObject(); |
| 70 | |
| 71 | |
| 72 | // Test the methods of generator objects. |
| 73 | function TestGeneratorObjectMethods() { |
| 74 | function* g() { yield 1; } |
| 75 | var iter = g(); |
| 76 | |
| 77 | function TestNonGenerator(non_generator) { |
| 78 | assertThrows(function() { iter.next.call(non_generator); }, TypeError); |
| 79 | assertThrows(function() { iter.next.call(non_generator, 1); }, TypeError); |
| 80 | assertThrows(function() { iter.throw.call(non_generator, 1); }, TypeError); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 81 | } |
| 82 | |
| 83 | TestNonGenerator(1); |
| 84 | TestNonGenerator({}); |
| 85 | TestNonGenerator(function(){}); |
| 86 | TestNonGenerator(g); |
| 87 | TestNonGenerator(g.prototype); |
| 88 | } |
| 89 | TestGeneratorObjectMethods(); |