michael@0: // Test extracting frame.arguments element getters and calling them in
michael@0: // various awkward ways.
michael@0: 
michael@0: load(libdir + "asserts.js");
michael@0: 
michael@0: var g = newGlobal();
michael@0: var dbg = Debugger(g);
michael@0: var hits = 0;
michael@0: var fframe, farguments, fgetter;
michael@0: dbg.onDebuggerStatement = function (frame) {
michael@0:     if (hits === 0) {
michael@0:         fframe = frame;
michael@0:         farguments = frame.arguments;
michael@0:         fgetter = Object.getOwnPropertyDescriptor(farguments, "0").get;
michael@0:         assertEq(fgetter instanceof Function, true);
michael@0: 
michael@0:         // Calling the getter without an appropriate this-object
michael@0:         // fails, but shouldn't assert or crash.
michael@0:         assertThrowsInstanceOf(function () { fgetter.call(Math); }, TypeError);
michael@0:     } else {
michael@0:         // Since fframe is still on the stack, fgetter can be applied to it.
michael@0:         assertEq(fframe.live, true);
michael@0:         assertEq(fgetter.call(farguments), 100);
michael@0: 
michael@0:         // Since h was called without arguments, there is no argument 0.
michael@0:         assertEq(fgetter.call(frame.arguments), undefined);
michael@0:     }
michael@0:     hits++;
michael@0: };
michael@0: 
michael@0: g.eval("function h() { debugger; }");
michael@0: g.eval("function f(x) { debugger; h(); }");
michael@0: g.f(100);
michael@0: assertEq(hits, 2);
michael@0: 
michael@0: // Now that fframe is no longer live, trying to get its arguments should throw.
michael@0: assertEq(fframe.live, false);
michael@0: assertThrowsInstanceOf(function () { fgetter.call(farguments); }, Error);