michael@0: // When a recursive function has many frames on the stack, onStep may be set or
michael@0: // not independently on each frame.
michael@0: 
michael@0: var g = newGlobal();
michael@0: g.eval("function f(x) {\n" +
michael@0:        "    if (x > 0)\n" +
michael@0:        "        f(x - 1);\n" +
michael@0:        "    else\n" +
michael@0:        "        debugger;\n" +
michael@0:        "    return x;\n" +
michael@0:        "}");
michael@0: 
michael@0: var dbg = Debugger(g);
michael@0: var seen = [0, 0, 0, 0, 0, 0, 0, 0];
michael@0: function step() {
michael@0:     seen[this.arguments[0]] = 1;
michael@0: }
michael@0: dbg.onEnterFrame = function (frame) {
michael@0:     // Turn on stepping for even-numbered frames.
michael@0:     var x = frame.arguments[0];
michael@0:     if (x % 2 === 0)
michael@0:         frame.onStep = step;
michael@0: };
michael@0: dbg.onDebuggerStatement = function (frame) {
michael@0:     // This is called with 8 call frames on the stack, 7 down to 0.
michael@0:     // At this point we should have seen all the even-numbered frames.
michael@0:     assertEq(seen.join(""), "10101010");
michael@0: 
michael@0:     // Now reset seen to see which frames fire onStep on the way out.
michael@0:     seen = [0, 0, 0, 0, 0, 0, 0, 0];
michael@0: };
michael@0: 
michael@0: g.f(7);
michael@0: assertEq(seen.join(""), "10101010");