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1 // Copyright 2015 the V8 project authors. All rights reserved. | 1 // Copyright 2015 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 // New space must be at max capacity to trigger pretenuring decision. | 5 // New space must be at max capacity to trigger pretenuring decision. |
6 // Flags: --allow-natives-syntax --verify-heap --max-semi-space-size=1 | 6 // Flags: --allow-natives-syntax --verify-heap --max-semi-space-size=1 |
7 // Flags: --expose-gc --no-always-opt | 7 // Flags: --expose-gc |
8 | |
9 assertFalse(isAlwaysOptimize()); | |
10 | 8 |
11 var global = []; // Used to keep some objects alive. | 9 var global = []; // Used to keep some objects alive. |
12 | 10 |
13 function Ctor() { | 11 function Ctor() { |
14 var result = {a: {}, b: {}, c: {}, d: {}, e: {}, f: {}, g: {}}; | 12 var result = {a: {}, b: {}, c: {}, d: {}, e: {}, f: {}, g: {}}; |
15 return result; | 13 return result; |
16 } | 14 } |
17 | 15 |
18 gc(); | 16 gc(); |
19 | 17 |
20 for (var i = 0; i < 120; i++) { | 18 for (var i = 0; i < 120; i++) { |
21 // Make the "a" property long-lived, while everything else is short-lived. | 19 // Make the "a" property long-lived, while everything else is short-lived. |
22 global.push(Ctor().a); | 20 global.push(Ctor().a); |
23 (function FillNewSpace() { new Array(10000); })(); | 21 (function FillNewSpace() { new Array(10000); })(); |
24 } | 22 } |
25 | 23 |
26 // The bad situation is only triggered if Ctor wasn't optimized too early. | 24 // The bad situation is only triggered if Ctor wasn't optimized too early. |
27 assertUnoptimized(Ctor); | 25 assertUnoptimized(Ctor); |
28 // Optimized code for Ctor will pretenure the "a" property, so it will have | 26 // Optimized code for Ctor will pretenure the "a" property, so it will have |
29 // three allocations: | 27 // three allocations: |
30 // #1 Allocate the "result" object in new-space. | 28 // #1 Allocate the "result" object in new-space. |
31 // #2 Allocate the object stored in the "a" property in old-space. | 29 // #2 Allocate the object stored in the "a" property in old-space. |
32 // #3 Allocate the objects for the "b" through "g" properties in new-space. | 30 // #3 Allocate the objects for the "b" through "g" properties in new-space. |
33 %OptimizeFunctionOnNextCall(Ctor); | 31 %OptimizeFunctionOnNextCall(Ctor); |
34 for (var i = 0; i < 10000; i++) { | 32 for (var i = 0; i < 10000; i++) { |
35 // At least one of these calls will run out of new space. The bug is | 33 // At least one of these calls will run out of new space. The bug is |
36 // triggered when it is allocation #3 that triggers GC. | 34 // triggered when it is allocation #3 that triggers GC. |
37 Ctor(); | 35 Ctor(); |
38 } | 36 } |
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