| Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 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 |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | // New space must be at max capacity to trigger pretenuring decision. |
| 6 | // Flags: --allow-natives-syntax --verify-heap --max-semi-space-size=1 |
| 7 | |
| 8 | var global = []; // Used to keep some objects alive. |
| 9 | |
| 10 | function Ctor() { |
| 11 | var result = {a: {}, b: {}, c: {}, d: {}, e: {}, f: {}, g: {}}; |
| 12 | return result; |
| 13 | } |
| 14 | |
| 15 | for (var i = 0; i < 120; i++) { |
| 16 | // Make the "a" property long-lived, while everything else is short-lived. |
| 17 | global.push(Ctor().a); |
| 18 | (function FillNewSpace() { new Array(10000); })(); |
| 19 | } |
| 20 | |
| 21 | // The bad situation is only triggered if Ctor wasn't optimized too early. |
| 22 | assertUnoptimized(Ctor); |
| 23 | // Optimized code for Ctor will pretenure the "a" property, so it will have |
| 24 | // three allocations: |
| 25 | // #1 Allocate the "result" object in new-space. |
| 26 | // #2 Allocate the object stored in the "a" property in old-space. |
| 27 | // #3 Allocate the objects for the "b" through "g" properties in new-space. |
| 28 | %OptimizeFunctionOnNextCall(Ctor); |
| 29 | for (var i = 0; i < 10000; i++) { |
| 30 | // At least one of these calls will run out of new space. The bug is |
| 31 | // triggered when it is allocation #3 that triggers GC. |
| 32 | Ctor(); |
| 33 | } |