1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/js/xpconnect/tests/unit/test_tearoffs.js Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,108 @@
1.4 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.5 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.6 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.7 +
1.8 +const Cc = Components.classes;
1.9 +const Ci = Components.interfaces;
1.10 +
1.11 +function run_test() {
1.12 +
1.13 + // Load the component manifest containing our test interface implementations.
1.14 + Components.manager.autoRegister(do_get_file('../components/js/xpctest.manifest'));
1.15 +
1.16 + // Shortcut the interfaces we're using.
1.17 + var ifs = {
1.18 + a: Ci['nsIXPCTestInterfaceA'],
1.19 + b: Ci['nsIXPCTestInterfaceB'],
1.20 + c: Ci['nsIXPCTestInterfaceC']
1.21 + };
1.22 +
1.23 + // Shortcut the class we're instantiating. This implements all three interfaces.
1.24 + var cls = Cc["@mozilla.org/js/xpc/test/js/TestInterfaceAll;1"];
1.25 +
1.26 + // Run through the logic a few times.
1.27 + for (i = 0; i < 2; ++i)
1.28 + play_with_tearoffs(ifs, cls);
1.29 +}
1.30 +
1.31 +function play_with_tearoffs(ifs, cls) {
1.32 +
1.33 + // Allocate a bunch of objects, QI-ed to B.
1.34 + var instances = [];
1.35 + for (var i = 0; i < 300; ++i)
1.36 + instances.push(cls.createInstance(ifs.b));
1.37 +
1.38 + // Nothing to collect.
1.39 + gc();
1.40 +
1.41 + // QI them to A.
1.42 + instances.forEach(function(v, i, a) { v.QueryInterface(ifs.a); });
1.43 +
1.44 + // QI them to C.
1.45 + instances.forEach(function(v, i, a) { v.QueryInterface(ifs.c); });
1.46 +
1.47 + // Check
1.48 + do_check_true('name' in instances[10], 'Have the prop from A/B');
1.49 + do_check_true('someInteger' in instances[10], 'Have the prop from C');
1.50 +
1.51 + // Grab tearoff reflections for a and b.
1.52 + var aTearOffs = instances.map(function(v, i, a) { return v.nsIXPCTestInterfaceA; } );
1.53 + var bTearOffs = instances.map(function(v, i, a) { return v.nsIXPCTestInterfaceB; } );
1.54 +
1.55 + // Check
1.56 + do_check_true('name' in aTearOffs[1], 'Have the prop from A');
1.57 + do_check_true(!('someInteger' in aTearOffs[1]), 'Dont have the prop from C');
1.58 +
1.59 + // Nothing to collect.
1.60 + gc();
1.61 +
1.62 + // Null out every even instance pointer.
1.63 + for (var i = 0; i < instances.length; ++i)
1.64 + if (i % 2 == 0)
1.65 + instances[i] = null;
1.66 +
1.67 + // Nothing to collect, since we still have the A and B tearoff reflections.
1.68 + gc();
1.69 +
1.70 + // Null out A tearoff reflections that are a multiple of 3.
1.71 + for (var i = 0; i < aTearOffs.length; ++i)
1.72 + if (i % 3 == 0)
1.73 + aTearOffs[i] = null;
1.74 +
1.75 + // Nothing to collect, since we still have the B tearoff reflections.
1.76 + gc();
1.77 +
1.78 + // Null out B tearoff reflections that are a multiple of 5.
1.79 + for (var i = 0; i < bTearOffs.length; ++i)
1.80 + if (i % 5 == 0)
1.81 + bTearOffs[i] = null;
1.82 +
1.83 + // This should collect every 30th object (indices that are multiples of 2, 3, and 5).
1.84 + gc();
1.85 +
1.86 + // Kill the b tearoffs entirely.
1.87 + bTearOffs = 0;
1.88 +
1.89 + // Collect more.
1.90 + gc();
1.91 +
1.92 + // Get C tearoffs.
1.93 + var cTearOffs = instances.map(function(v, i, a) { return v ? v.nsIXPCTestInterfaceC : null; } );
1.94 +
1.95 + // Check.
1.96 + do_check_true(!('name' in cTearOffs[1]), 'Dont have the prop from A');
1.97 + do_check_true('someInteger' in cTearOffs[1], 'have the prop from C');
1.98 +
1.99 + // Null out the a tearoffs.
1.100 + aTearOffs = null;
1.101 +
1.102 + // Collect all even indices.
1.103 + gc();
1.104 +
1.105 + // Collect all indices.
1.106 + instances = null;
1.107 + gc();
1.108 +
1.109 + // Give ourselves a pat on the back. :-)
1.110 + do_check_true(true, "Got all the way through without crashing!");
1.111 +}
