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1 // Copyright 2012 the V8 project authors. All rights reserved. | 1 // Copyright 2012 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 |
11 // with the distribution. | 11 // with the distribution. |
12 // * Neither the name of Google Inc. nor the names of its | 12 // * Neither the name of Google Inc. nor the names of its |
13 // contributors may be used to endorse or promote products derived | 13 // contributors may be used to endorse or promote products derived |
14 // from this software without specific prior written permission. | 14 // from this software without specific prior written permission. |
15 // | 15 // |
16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | 16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | 17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | 18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | 19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | 20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | 21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | 22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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 // Flags: --allow-natives-syntax --expose-gc | 28 // Flags: --expose-gc |
29 | 29 |
| 30 // Create a transition tree A (no descriptors) -> B (descriptor for a) -> C |
| 31 // (descriptor for a and c), that all share the descriptor array [a,c]. C is the |
| 32 // owner of the descriptor array. |
30 var o = {}; | 33 var o = {}; |
31 var o2 = {}; | |
32 | |
33 o.a = 1; | 34 o.a = 1; |
34 o2.a = 1; | |
35 function f() { return 10; } | |
36 // Adds a non-field enumerable property. | |
37 Object.defineProperty(o, "b", { get: f, enumerable: true }); | |
38 Object.defineProperty(o2, "b", { get: f, enumerable: true }); | |
39 assertTrue(%HaveSameMap(o, o2)); | |
40 o.c = 2; | 35 o.c = 2; |
41 | 36 |
42 for (var x in o) { } | 37 // Add a transition B -> D where D has its own descriptor array [a,b] where b is |
| 38 // a constant function. |
| 39 var o1 = {}; |
| 40 o1.a = 1; |
| 41 |
| 42 // Install an enumeration cache in the descriptor array [a,c] at map B. |
| 43 for (var x in o1) { } |
| 44 o1.b = function() { return 1; }; |
| 45 |
| 46 // Return ownership of the descriptor array [a,c] to B and trim it to [a]. |
43 o = null; | 47 o = null; |
| 48 gc(); |
44 | 49 |
45 gc(); | 50 // Convert the transition B -> D into a transition to B -> E so that E uses the |
| 51 // instance descriptors [a,b] with b being a field. |
| 52 var o2 = {}; |
| 53 o2.a = 1; |
| 54 o2.b = 10; |
| 55 |
| 56 // Create an object with map B and iterate over it. |
| 57 var o3 = {}; |
| 58 o3.a = 1; |
| 59 |
| 60 for (var y in o3) { } |
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