michael@0: // Multiple Debugger objects can set breakpoints at the same instruction.
michael@0: 
michael@0: var g = newGlobal();
michael@0: function attach(g, i) {
michael@0:     var dbg = Debugger(g);
michael@0:     dbg.onDebuggerStatement = function (frame) {
michael@0:         var s = frame.eval("f").return.script;
michael@0:         var offs = s.getLineOffsets(g.line0 + 3);
michael@0:         for (var j = 0; j < offs.length; j++)
michael@0:             s.setBreakpoint(offs[j], {hit: function () { g.log += "" + i; }});
michael@0:     };
michael@0: }
michael@0: 
michael@0: g.eval("var line0 = Error().lineNumber;\n" +
michael@0:        "function f() {\n" +     // line0 + 1
michael@0:        "    log += 'a';\n" +    // line0 + 2
michael@0:        "    log += 'b';\n" +    // line0 + 3
michael@0:        "}\n");
michael@0: 
michael@0: for (var i = 0; i < 3; i++)
michael@0:     attach(g, i);
michael@0: 
michael@0: g.log = '';
michael@0: g.eval('debugger;');
michael@0: g.log += 'x';
michael@0: g.f();
michael@0: assertEq(g.log, 'xa012b');