Frame-onStep-04.js (1010B)
1 // When a recursive function has many frames on the stack, onStep may be set or 2 // not independently on each frame. 3 4 var g = newGlobal({newCompartment: true}); 5 g.eval("function f(x) {\n" + 6 " if (x > 0)\n" + 7 " f(x - 1);\n" + 8 " else\n" + 9 " debugger;\n" + 10 " return x;\n" + 11 "}"); 12 13 var dbg = Debugger(g); 14 var seen = [0, 0, 0, 0, 0, 0, 0, 0]; 15 function step() { 16 seen[this.arguments[0]] = 1; 17 } 18 dbg.onEnterFrame = function (frame) { 19 // Turn on stepping for even-numbered frames. 20 var x = frame.arguments[0]; 21 if (x % 2 === 0) 22 frame.onStep = step; 23 }; 24 dbg.onDebuggerStatement = function (frame) { 25 // This is called with 8 call frames on the stack, 7 down to 0. 26 // At this point we should have seen all the even-numbered frames. 27 assertEq(seen.join(""), "10101010"); 28 29 // Now reset seen to see which frames fire onStep on the way out. 30 seen = [0, 0, 0, 0, 0, 0, 0, 0]; 31 }; 32 33 g.f(7); 34 assertEq(seen.join(""), "10101010");