Debugger: require debugger to be active when dealing with breaks.

test/mjsunit/es6/generators-relocation.js

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Flags: --expose-debug-as debug
 
 var Debug = debug.Debug;
 
 function assertIteratorResult(value, done, result) {
   assertEquals({value: value, done: done}, result);
 }
 
 function RunTest(formals_and_body, args, value1, value2) {
   // A null listener. It isn't important what the listener does.
   function listener(event, exec_state, event_data, data) {
   }
 
   // Create the generator function outside a debugging context. It will probably
   // be lazily compiled.
   var gen = (function*(){}).constructor.apply(null, formals_and_body);
 
   // Instantiate the generator object.
   var obj = gen.apply(null, args);
 
   // Advance to the first yield.
   assertIteratorResult(value1, false, obj.next());
 
-  // Add a breakpoint on line 3 (the second yield).
-  var bp = Debug.setBreakPoint(gen, 3);
-
   // Enable the debugger, which should force recompilation of the generator
   // function and relocation of the suspended generator activation.
   Debug.setListener(listener);
 
+  // Add a breakpoint on line 3 (the second yield).
+  var bp = Debug.setBreakPoint(gen, 3);
+
   // Check that the generator resumes and suspends properly.
   assertIteratorResult(value2, false, obj.next());
 
   // Disable debugger -- should not force recompilation.
   Debug.clearBreakPoint(bp);
   Debug.setListener(null);
 
   // Run to completion.
   assertIteratorResult(undefined, true, obj.next());
 }
 
 function prog(a, b, c) {
   return a + ';\n' + 'yield ' + b + ';\n' + 'yield ' + c;
 }
 
 // Simple empty local scope.
 RunTest([prog('', '1', '2')], [], 1, 2);
 
 RunTest([prog('for (;;) break', '1', '2')], [], 1, 2);
 
 RunTest([prog('while (0) foo()', '1', '2')], [], 1, 2);
 
 RunTest(['a', prog('var x = 3', 'a', 'x')], [1], 1, 3);
 
 RunTest(['a', prog('', '1', '2')], [42], 1, 2);
 
 RunTest(['a', prog('for (;;) break', '1', '2')], [42], 1, 2);