From 36d22d82aa202bb199967e9512281e9a53db42c9 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 21:33:14 +0200
Subject: Adding upstream version 115.7.0esr.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 js/xpconnect/tests/unit/test_tearoffs.js | 115 +++++++++++++++++++++++++++++++
 1 file changed, 115 insertions(+)
 create mode 100644 js/xpconnect/tests/unit/test_tearoffs.js

(limited to 'js/xpconnect/tests/unit/test_tearoffs.js')

diff --git a/js/xpconnect/tests/unit/test_tearoffs.js b/js/xpconnect/tests/unit/test_tearoffs.js
new file mode 100644
index 0000000000..18b07d1da1
--- /dev/null
+++ b/js/xpconnect/tests/unit/test_tearoffs.js
@@ -0,0 +1,115 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+function TestInterfaceAll() {}
+TestInterfaceAll.prototype = {
+  QueryInterface: ChromeUtils.generateQI(["nsIXPCTestInterfaceA",
+                                          "nsIXPCTestInterfaceB",
+                                          "nsIXPCTestInterfaceC"]),
+
+  /* nsIXPCTestInterfaceA / nsIXPCTestInterfaceB */
+  name: "TestInterfaceAllDefaultName",
+
+  /* nsIXPCTestInterfaceC */
+  someInteger: 42
+};
+
+function newWrappedJS() {
+  return xpcWrap(new TestInterfaceAll());
+}
+
+function run_test() {
+  // Shortcut the interfaces we're using.
+  var ifs = {
+    a: Ci['nsIXPCTestInterfaceA'],
+    b: Ci['nsIXPCTestInterfaceB'],
+    c: Ci['nsIXPCTestInterfaceC']
+  };
+
+  // Run through the logic a few times.
+  for (let i = 0; i < 2; ++i)
+    play_with_tearoffs(ifs);
+}
+
+function play_with_tearoffs(ifs) {
+
+  // Allocate a bunch of objects, QI-ed to B.
+  var instances = [];
+  for (var i = 0; i < 300; ++i)
+    instances.push(newWrappedJS().QueryInterface(ifs.b));
+
+  // Nothing to collect.
+  gc();
+
+  // QI them to A.
+  instances.forEach(function(v, i, a) { v.QueryInterface(ifs.a); });
+
+  // QI them to C.
+  instances.forEach(function(v, i, a) { v.QueryInterface(ifs.c); });
+
+  // Check
+  Assert.ok('name' in instances[10], 'Have the prop from A/B');
+  Assert.ok('someInteger' in instances[10], 'Have the prop from C');
+
+  // Grab tearoff reflections for a and b.
+  var aTearOffs = instances.map(function(v, i, a) { return v.nsIXPCTestInterfaceA; } );
+  var bTearOffs = instances.map(function(v, i, a) { return v.nsIXPCTestInterfaceB; } );
+
+  // Check
+  Assert.ok('name' in aTearOffs[1], 'Have the prop from A');
+  Assert.ok(!('someInteger' in aTearOffs[1]), 'Dont have the prop from C');
+
+  // Nothing to collect.
+  gc();
+
+  // Null out every even instance pointer.
+  for (var i = 0; i < instances.length; ++i)
+    if (i % 2 == 0)
+        instances[i] = null;
+
+  // Nothing to collect, since we still have the A and B tearoff reflections.
+  gc();
+
+  // Null out A tearoff reflections that are a multiple of 3.
+  for (var i = 0; i < aTearOffs.length; ++i)
+    if (i % 3 == 0)
+        aTearOffs[i] = null;
+
+  // Nothing to collect, since we still have the B tearoff reflections.
+  gc();
+
+  // Null out B tearoff reflections that are a multiple of 5.
+  for (var i = 0; i < bTearOffs.length; ++i)
+    if (i % 5 == 0)
+        bTearOffs[i] = null;
+
+  // This should collect every 30th object (indices that are multiples of 2, 3, and 5).
+  gc();
+
+  // Kill the b tearoffs entirely.
+  bTearOffs = 0;
+
+  // Collect more.
+  gc();
+
+  // Get C tearoffs.
+  var cTearOffs = instances.map(function(v, i, a) { return v ? v.nsIXPCTestInterfaceC : null; } );
+
+  // Check.
+  Assert.ok(!('name' in cTearOffs[1]), 'Dont have the prop from A');
+  Assert.ok('someInteger' in cTearOffs[1], 'have the prop from C');
+
+  // Null out the a tearoffs.
+  aTearOffs = null;
+
+  // Collect all even indices.
+  gc();
+
+  // Collect all indices.
+  instances = null;
+  gc();
+
+  // Give ourselves a pat on the back. :-)
+  Assert.ok(true, "Got all the way through without crashing!");
+}
-- 
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