michael@0: // Setting frame.onStep to undefined turns off single-stepping.
michael@0: 
michael@0: var g = newGlobal();
michael@0: g.a = 0;
michael@0: g.eval("function f() {\n" +
michael@0:        "    a++;\n" +
michael@0:        "    a++;\n" +
michael@0:        "    a++;\n" +
michael@0:        "    a++;\n" +
michael@0:        "    return a;\n" +
michael@0:        "}\n");
michael@0: 
michael@0: var dbg = Debugger(g);
michael@0: var seen = [0, 0, 0, 0, 0];
michael@0: dbg.onEnterFrame = function (frame) {
michael@0:     seen[g.a] = 1;
michael@0:     frame.onStep = function () {
michael@0:         seen[g.a] = 1;
michael@0:         if (g.a === 2) {
michael@0:             frame.onStep = undefined;
michael@0:             assertEq(frame.onStep, undefined);
michael@0:         }
michael@0:     };
michael@0: }
michael@0: 
michael@0: g.f();
michael@0: assertEq(seen.join(","), "1,1,1,0,0");