michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: /* See https://bugzilla.mozilla.org/show_bug.cgi?id=317304 */
michael@0: 
michael@0: function run_test()
michael@0: {
michael@0:   // Bug 712649: Calling getWeakReference(null) should work.
michael@0:   try {
michael@0:     var nullWeak = Components.utils.getWeakReference(null);
michael@0:     do_check_true(nullWeak.get() === null);
michael@0:   } catch (e) {
michael@0:     do_check_true(false);
michael@0:   }
michael@0: 
michael@0:   var obj = { num: 5, str: 'foo' };
michael@0:   var weak = Components.utils.getWeakReference(obj);
michael@0: 
michael@0:   do_check_true(weak.get() === obj);
michael@0:   do_check_true(weak.get().num == 5);
michael@0:   do_check_true(weak.get().str == 'foo');
michael@0: 
michael@0:   // Force garbage collection
michael@0:   Components.utils.forceGC();
michael@0: 
michael@0:   // obj still references the object, so it should still be accessible via weak
michael@0:   do_check_true(weak.get() === obj);
michael@0:   do_check_true(weak.get().num == 5);
michael@0:   do_check_true(weak.get().str == 'foo');
michael@0: 
michael@0:   // Clear obj's reference to the object and force garbage collection. To make
michael@0:   // sure that there are no instances of obj stored in the registers or on the
michael@0:   // native stack and the conservative GC would not find it we force the same
michael@0:   // code paths that we used for the initial allocation.
michael@0:   obj = { num: 6, str: 'foo2' };
michael@0:   var weak2 = Components.utils.getWeakReference(obj);
michael@0:   do_check_true(weak2.get() === obj);
michael@0: 
michael@0:   Components.utils.forceGC();
michael@0: 
michael@0:   // The object should have been garbage collected and so should no longer be
michael@0:   // accessible via weak
michael@0:   do_check_true(weak.get() === null);
michael@0: }