The Tor Browser / file revision

 // Bug 689101 - if the binary layout of jsval does not match between C and C++

 // code, then calls to functions returning jsval may get compiled differently

 // than the callee, resulting in parameters being shifted over by one.

 //

 // An example is where on Windows, calling jsdValue.getWrappedValue() will

 // return a random floating point number instead of an object.

 //

 // This test must be run with debugging already enabled

 function run_test() {

     const Cc = Components.classes;

     const Ci = Components.interfaces;

     const DebuggerService = Cc["@mozilla.org/js/jsd/debugger-service;1"];

     const jsdIDebuggerService = Ci.jsdIDebuggerService;

     var jsd = DebuggerService.getService(jsdIDebuggerService);

     do_check_true(jsd.isOn);

     var n = 0;

     function f() {

         n++;

     }

     jsd.enumerateScripts({ enumerateScript: function(script) {

         script.setBreakpoint(0);

     } });

     jsd.breakpointHook = function(frame, type, dummy) {

         var scope = frame.scope;

         var parent = scope.jsParent; // Probably does not need to be called

         var wrapped = scope.getWrappedValue();

         // Do not try to print 'wrapped'; it may be an internal Call object

         // that will crash when you toString it. Different bug.

         do_check_eq(typeof(wrapped), "object");

         return Ci.jsdIExecutionHook.RETURN_CONTINUE;

     };

     f();

     jsd.breakpointHook = null;

     jsd = null;

 }