js/xpconnect/tests/unit/test_js_weak_references.js@6474c204b198 (annotated)
js/xpconnect/tests/unit/test_js_weak_references.js
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | /* This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 2 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 3 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 4 | |
| michael@0 | 5 | /* See https://bugzilla.mozilla.org/show_bug.cgi?id=317304 */ |
| michael@0 | 6 | |
| michael@0 | 7 | function run_test() |
| michael@0 | 8 | { |
| michael@0 | 9 | // Bug 712649: Calling getWeakReference(null) should work. |
| michael@0 | 10 | try { |
| michael@0 | 11 | var nullWeak = Components.utils.getWeakReference(null); |
| michael@0 | 12 | do_check_true(nullWeak.get() === null); |
| michael@0 | 13 | } catch (e) { |
| michael@0 | 14 | do_check_true(false); |
| michael@0 | 15 | } |
| michael@0 | 16 | |
| michael@0 | 17 | var obj = { num: 5, str: 'foo' }; |
| michael@0 | 18 | var weak = Components.utils.getWeakReference(obj); |
| michael@0 | 19 | |
| michael@0 | 20 | do_check_true(weak.get() === obj); |
| michael@0 | 21 | do_check_true(weak.get().num == 5); |
| michael@0 | 22 | do_check_true(weak.get().str == 'foo'); |
| michael@0 | 23 | |
| michael@0 | 24 | // Force garbage collection |
| michael@0 | 25 | Components.utils.forceGC(); |
| michael@0 | 26 | |
| michael@0 | 27 | // obj still references the object, so it should still be accessible via weak |
| michael@0 | 28 | do_check_true(weak.get() === obj); |
| michael@0 | 29 | do_check_true(weak.get().num == 5); |
| michael@0 | 30 | do_check_true(weak.get().str == 'foo'); |
| michael@0 | 31 | |
| michael@0 | 32 | // Clear obj's reference to the object and force garbage collection. To make |
| michael@0 | 33 | // sure that there are no instances of obj stored in the registers or on the |
| michael@0 | 34 | // native stack and the conservative GC would not find it we force the same |
| michael@0 | 35 | // code paths that we used for the initial allocation. |
| michael@0 | 36 | obj = { num: 6, str: 'foo2' }; |
| michael@0 | 37 | var weak2 = Components.utils.getWeakReference(obj); |
| michael@0 | 38 | do_check_true(weak2.get() === obj); |
| michael@0 | 39 | |
| michael@0 | 40 | Components.utils.forceGC(); |
| michael@0 | 41 | |
| michael@0 | 42 | // The object should have been garbage collected and so should no longer be |
| michael@0 | 43 | // accessible via weak |
| michael@0 | 44 | do_check_true(weak.get() === null); |
| michael@0 | 45 | } |
