js/xpconnect/tests/chrome/test_onGarbageCollection.html

   1 <!doctype html>
   2 <html>
   3   <head>
   4     <title>Bug 1150253 - Sanity test for the SpiderMonkey Debugger API's onGarbageCollection hook</title>
   5     <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js">
   6     </script>
   7   </head>
   8   <body xmlns="http://www.w3.org/1999/xhtml">
   9     <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=1150253"
  10        target="_blank">Mozilla Bug 1150253</a>
  11
  12     <script type="application/javascript">
  13     SimpleTest.waitForExplicitFinish();
  14
  15     const { gc } = Cu.getJSTestingFunctions();
  16
  17     // Instantiate `Debugger` in a sandbox as Debugger requires to be created
  18     // in a compartment different than the debuggee.
  19     let sandbox = Cu.Sandbox(
  20       Components.Constructor("@mozilla.org/systemprincipal;1", "nsIPrincipal")(),
  21       {
  22         freshCompartment: true,
  23         wantGlobalProperties: ["ChromeUtils"],
  24       }
  25     );
  26     Cu.evalInSandbox(`
  27 const { addDebuggerToGlobal } = ChromeUtils.importESModule(
  28   'resource://gre/modules/jsdebugger.sys.mjs'
  29 );
  30 addDebuggerToGlobal(globalThis);
  31 `, sandbox
  32     );
  33
  34     const dbg = new sandbox.Debugger(this);
  35
  36     dbg.memory.onGarbageCollection = function (data) {
  37       // Don't keep calling this hook after we finish.
  38       dbg.memory.onGarbageCollection = undefined;
  39       dbg.removeAllDebuggees();
  40
  41       ok(data, "The onGarbageCollection hook was fired.");
  42       SimpleTest.finish();
  43     };
  44
  45     gc();
  46     </script>
  47   </body>
  48 </html>