breakpoint-11.js (1230B)
1 // Setting a breakpoint in a generator function works, and we can 2 // traverse the stack and evaluate expressions in the context of older 3 // generator frames. 4 5 var g = newGlobal({newCompartment: true}); 6 var dbg = Debugger(g); 7 dbg.onDebuggerStatement = function (frame) { 8 function hit(frame) { 9 frame.older.eval("q += 16"); 10 } 11 12 var s = frame.script; 13 var offs = s.getLineOffsets(g.line0 + 9); 14 for (var i = 0; i < offs.length; i++) 15 s.setBreakpoint(offs[i], {hit: hit}); 16 }; 17 18 g.eval("line0 = Error().lineNumber;\n" + 19 "function* g(x) {\n" + // + 1 20 " var q = 10;\n" + // + 2 21 " yield* x;\n" + // + 3 22 " return q;\n" + // + 4 23 "}\n" + // + 5 24 "function* range(n) {\n" + // + 6 25 " debugger;\n" + // + 7 26 " for (var i = 0; i < n; i++)\n" + // + 8 27 " yield i;\n" + // + 9 <-- breakpoint 28 " return;\n" + // so that line 9 only has the yield 29 "}"); 30 31 g.eval("var iter = g(range(2))"); 32 g.eval("var first = iter.next().value"); 33 g.eval("var second = iter.next().value"); 34 g.eval("var third = iter.next().value"); 35 36 assertEq(g.first, 0); 37 assertEq(g.second, 1); 38 assertEq(g.third, 42);