michael@0: // getLineOffsets works with instructions reachable only by breaking out of a loop or switch.
michael@0: 
michael@0: var g = newGlobal();
michael@0: g.line0 = null;
michael@0: var dbg = Debugger(g);
michael@0: var where;
michael@0: dbg.onDebuggerStatement = function (frame) {
michael@0:     var s = frame.eval("f").return.script;
michael@0:     var lineno = g.line0 + where;
michael@0:     var offs = s.getLineOffsets(lineno);
michael@0:     for (var i = 0; i < offs.length; i++) {
michael@0:         assertEq(s.getOffsetLine(offs[i]), lineno);
michael@0:         s.setBreakpoint(offs[i], {hit: function () { g.log += 'B'; }});
michael@0:     }
michael@0:     g.log += 'A';
michael@0: };
michael@0: 
michael@0: function test(s) {
michael@0:     var count = (s.split(/\n/).length - 1); // number of newlines in s
michael@0:     g.log = '';
michael@0:     where = 3 + count + 1;
michael@0:     g.eval("line0 = Error().lineNumber;\n" +
michael@0:            "debugger;\n" +          // line0 + 1
michael@0:            "function f(i) {\n" +    // line0 + 2
michael@0:            s +                      // line0 + 3 ... line0 + where - 2
michael@0:            "    log += '?';\n" +    // line0 + where - 1
michael@0:            "    log += '!';\n" +    // line0 + where
michael@0:            "}\n");
michael@0:     g.f(0);
michael@0:     assertEq(g.log, 'A?B!');
michael@0: }
michael@0: 
michael@0: test("i = 128;\n" +
michael@0:      "for (;;) {\n" +
michael@0:      "    var x = i - 10;;\n" +
michael@0:      "    if (x < 0)\n" +
michael@0:      "        break;\n" +
michael@0:      "    i >>= 2;\n" +
michael@0:      "}\n");
michael@0: 
michael@0: test("while (true)\n" +
michael@0:      "    if (++i === 2) break;\n");
michael@0: 
michael@0: test("do {\n" +
michael@0:      "    if (++i === 2) break;\n" +
michael@0:      "} while (true);\n");
michael@0: 
michael@0: test("switch (i) {\n" +
michael@0:      "  case 2: return 7;\n" +
michael@0:      "  case 1: return 8;\n" +
michael@0:      "  case 0: break;\n" +
michael@0:      "  default: return -i;\n" +
michael@0:      "}\n");