1 // Copyright 2014 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 // Flags: --expose-debug-as debug --harmony-generators
7 var Debug = debug.Debug;
9 function assertIteratorResult(value, done, result) {
10 assertEquals({value: value, done: done}, result);
13 function RunTest(formals_and_body, args, value1, value2) {
14 // A null listener. It isn't important what the listener does.
15 function listener(event, exec_state, event_data, data) {
18 // Create the generator function outside a debugging context. It will probably
19 // be lazily compiled.
20 var gen = (function*(){}).constructor.apply(null, formals_and_body);
22 // Instantiate the generator object.
23 var obj = gen.apply(null, args);
25 // Advance to the first yield.
26 assertIteratorResult(value1, false, obj.next());
28 // Add a breakpoint on line 3 (the second yield).
29 var bp = Debug.setBreakPoint(gen, 3);
31 // Enable the debugger, which should force recompilation of the generator
32 // function and relocation of the suspended generator activation.
33 Debug.setListener(listener);
35 // Check that the generator resumes and suspends properly.
36 assertIteratorResult(value2, false, obj.next());
38 // Disable debugger -- should not force recompilation.
39 Debug.clearBreakPoint(bp);
40 Debug.setListener(null);
43 assertIteratorResult(undefined, true, obj.next());
46 function prog(a, b, c) {
47 return a + ';\n' + 'yield ' + b + ';\n' + 'yield ' + c;
50 // Simple empty local scope.
51 RunTest([prog('', '1', '2')], [], 1, 2);
53 RunTest([prog('for (;;) break', '1', '2')], [], 1, 2);
55 RunTest([prog('while (0) foo()', '1', '2')], [], 1, 2);
57 RunTest(['a', prog('var x = 3', 'a', 'x')], [1], 1, 3);
59 RunTest(['a', prog('', '1', '2')], [42], 1, 2);
61 RunTest(['a', prog('for (;;) break', '1', '2')], [42], 1, 2);