v8/test/mjsunit/regress/regress-1639.js

// Copyright 2012 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
// met:
//
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// Flags: --expose-debug-as debug
// Get the Debug object exposed from the debug context global object.
Debug = debug.Debug
var breaks = 0;
var exception = false;

function listener(event, exec_state, event_data, data) {
  try {
    if (event == Debug.DebugEvent.Break) {
      var line = event_data.sourceLineText();
      print('break: ' + line);

      assertEquals(-1, line.indexOf('NOBREAK'),
                   "should not break on unexpected lines")
      assertEquals('BREAK ' + breaks, line.substr(-7));
      breaks++;
      if (breaks < 4) exec_state.prepareStep(Debug.StepAction.StepNext);
    }
  } catch (e) {
    print(e);
    exception = true;
  }
}

// Add the debug event listener.
Debug.setListener(listener);

function a(f) {
  if (f) {  // NOBREAK: should not break here!
    try {
      f();
    } catch(e) {
    }
  }
}  // BREAK 2

function b() {
  c();  // BREAK 0
}  // BREAK 1

function c() {
  a();
}

// Set a break point and call to invoke the debug event listener.
Debug.setBreakPoint(b, 0, 0);
a(b);
a(); // BREAK 3

assertFalse(exception);