michael@0: // We detect and stop the runaway recursion caused by making onEnterFrame a
michael@0: // wrapper of a debuggee function.
michael@0: 
michael@0: // This is all a bit silly. In any reasonable design, both debugger re-entry
michael@0: // (the second onEnterFrame invocation) and debuggee re-entry (the call to g.f
michael@0: // from within the debugger, not via a Debugger invocation function) would raise
michael@0: // errors immediately. We have plans to do so, but in the mean time, we settle
michael@0: // for at least detecting the recursion.
michael@0: 
michael@0: load(libdir + 'asserts.js');
michael@0: 
michael@0: var g = newGlobal();
michael@0: g.eval("function f(frame) { n++; return 42; }");
michael@0: g.n = 0;
michael@0: 
michael@0: var dbg = Debugger();
michael@0: var gw = dbg.addDebuggee(g);
michael@0: 
michael@0: // Register the debuggee function as the onEnterFrame handler. When we first
michael@0: // call or eval in the debuggee:
michael@0: //
michael@0: // - The onEnterFrame call reporting that frame's creation is itself an event
michael@0: //   that must be reported, so we call onEnterFrame again.
michael@0: //
michael@0: // - SpiderMonkey detects the out-of-control recursion, and generates a "too
michael@0: //   much recursion" InternalError in the youngest onEnterFrame call.
michael@0: //
michael@0: // - We don't catch it, so the onEnterFrame handler call itself throws.
michael@0: //
michael@0: // - Since the Debugger doesn't have an uncaughtExceptionHook (it can't; such a
michael@0: //   hook would itself raise a "too much recursion" exception), Spidermonkey
michael@0: //   reports the exception immediately and terminates the debuggee --- which is
michael@0: //   the next-older onEnterFrame call.
michael@0: //
michael@0: // - This termination propagates all the way out to the initial attempt to
michael@0: //   create a frame in the debuggee.
michael@0: dbg.onEnterFrame = g.f;
michael@0: 
michael@0: // Get a Debugger.Object instance referring to f.
michael@0: var debuggeeF = gw.makeDebuggeeValue(g.f);
michael@0: 
michael@0: // Using f.call allows us to catch the termination.
michael@0: assertEq(debuggeeF.call(), null);
michael@0: 
michael@0: // We should never actually begin execution of the function.
michael@0: assertEq(g.n, 0);
michael@0: 
michael@0: // When an error is reported, the shell usually exits with a nonzero exit code.
michael@0: // If we get here, the test passed, so override that behavior.
michael@0: quit(0);