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: const Cc = Components.classes;
michael@0: const Ci = Components.interfaces;
michael@0: 
michael@0: function run_test() {
michael@0: 
michael@0:   // Load the component manifest containing our test interface implementations.
michael@0:   Components.manager.autoRegister(do_get_file('../components/js/xpctest.manifest'));
michael@0: 
michael@0:   // Shortcut the interfaces we're using.
michael@0:   var ifs = {
michael@0:     a: Ci['nsIXPCTestInterfaceA'],
michael@0:     b: Ci['nsIXPCTestInterfaceB'],
michael@0:     c: Ci['nsIXPCTestInterfaceC']
michael@0:   };
michael@0: 
michael@0:   // Shortcut the class we're instantiating. This implements all three interfaces.
michael@0:   var cls = Cc["@mozilla.org/js/xpc/test/js/TestInterfaceAll;1"];
michael@0: 
michael@0:   // Run through the logic a few times.
michael@0:   for (i = 0; i < 2; ++i)
michael@0:     play_with_tearoffs(ifs, cls);
michael@0: }
michael@0: 
michael@0: function play_with_tearoffs(ifs, cls) {
michael@0: 
michael@0:   // Allocate a bunch of objects, QI-ed to B.
michael@0:   var instances = [];
michael@0:   for (var i = 0; i < 300; ++i)
michael@0:     instances.push(cls.createInstance(ifs.b));
michael@0: 
michael@0:   // Nothing to collect.
michael@0:   gc();
michael@0: 
michael@0:   // QI them to A.
michael@0:   instances.forEach(function(v, i, a) { v.QueryInterface(ifs.a); });
michael@0: 
michael@0:   // QI them to C.
michael@0:   instances.forEach(function(v, i, a) { v.QueryInterface(ifs.c); });
michael@0: 
michael@0:   // Check
michael@0:   do_check_true('name' in instances[10], 'Have the prop from A/B');
michael@0:   do_check_true('someInteger' in instances[10], 'Have the prop from C');
michael@0: 
michael@0:   // Grab tearoff reflections for a and b.
michael@0:   var aTearOffs = instances.map(function(v, i, a) { return v.nsIXPCTestInterfaceA; } );
michael@0:   var bTearOffs = instances.map(function(v, i, a) { return v.nsIXPCTestInterfaceB; } );
michael@0: 
michael@0:   // Check
michael@0:   do_check_true('name' in aTearOffs[1], 'Have the prop from A');
michael@0:   do_check_true(!('someInteger' in aTearOffs[1]), 'Dont have the prop from C');
michael@0: 
michael@0:   // Nothing to collect.
michael@0:   gc();
michael@0: 
michael@0:   // Null out every even instance pointer.
michael@0:   for (var i = 0; i < instances.length; ++i)
michael@0:     if (i % 2 == 0)
michael@0:         instances[i] = null;
michael@0: 
michael@0:   // Nothing to collect, since we still have the A and B tearoff reflections.
michael@0:   gc();
michael@0: 
michael@0:   // Null out A tearoff reflections that are a multiple of 3.
michael@0:   for (var i = 0; i < aTearOffs.length; ++i)
michael@0:     if (i % 3 == 0)
michael@0:         aTearOffs[i] = null;
michael@0: 
michael@0:   // Nothing to collect, since we still have the B tearoff reflections.
michael@0:   gc();
michael@0: 
michael@0:   // Null out B tearoff reflections that are a multiple of 5.
michael@0:   for (var i = 0; i < bTearOffs.length; ++i)
michael@0:     if (i % 5 == 0)
michael@0:         bTearOffs[i] = null;
michael@0: 
michael@0:   // This should collect every 30th object (indices that are multiples of 2, 3, and 5).
michael@0:   gc();
michael@0: 
michael@0:   // Kill the b tearoffs entirely.
michael@0:   bTearOffs = 0;
michael@0: 
michael@0:   // Collect more.
michael@0:   gc();
michael@0: 
michael@0:   // Get C tearoffs.
michael@0:   var cTearOffs = instances.map(function(v, i, a) { return v ? v.nsIXPCTestInterfaceC : null; } );
michael@0: 
michael@0:   // Check.
michael@0:   do_check_true(!('name' in cTearOffs[1]), 'Dont have the prop from A');
michael@0:   do_check_true('someInteger' in cTearOffs[1], 'have the prop from C');
michael@0: 
michael@0:   // Null out the a tearoffs.
michael@0:   aTearOffs = null;
michael@0: 
michael@0:   // Collect all even indices.
michael@0:   gc();
michael@0: 
michael@0:   // Collect all indices.
michael@0:   instances = null;
michael@0:   gc();
michael@0: 
michael@0:   // Give ourselves a pat on the back. :-)
michael@0:   do_check_true(true, "Got all the way through without crashing!");
michael@0: }