v8/test/mjsunit/debug-step-4.js

// Copyright 2008 the V8 project authors. All rights reserved.
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//
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// Flags: --expose-debug-as debug
// Get the Debug object exposed from the debug context global object.
Debug = debug.Debug

// Tests how debugger can step over not necessarily in the top frame.

// Simple 3 functions, that protocol their execution state in global
// variable state.
var state;

function f() {
  var a = 1978;
  for (state[2] = 0; state[2] < 3; state[2]++) {
    void String(a);
  }
}
function g() {
  for (state[1] = 0; state[1] < 3; state[1]++) {
    f();
  }
}
function h() {
  state = [-1, -1, -1];
  for (state[0] = 0; state[0] < 3; state[0]++) {
    g();
  }
}

function TestCase(step_count, expected_final_state) {
  print("Test case, step count: " + step_count);

  var listener_exception = null;
  var state_snapshot;
  var listener_state;
  var bp;

  function listener(event, exec_state, event_data, data) {
    print("Here ("+event+"/"+listener_state+"): " +
        exec_state.frame(0).sourceLineText());
    try {
      if (event == Debug.DebugEvent.Break) {
        if (listener_state == 0) {
          Debug.clearBreakPoint(bp);
          exec_state.prepareStep(Debug.StepAction.StepNext, step_count);
          listener_state = 1;
        } else if (listener_state == 1) {
          state_snapshot = String(state);
          print("State: " + state_snapshot);
          Debug.setListener(null);
          listener_state = 2;
        }
      }
    } catch (e) {
      listener_exception = e;
    }
  }


  // Add the debug event listener.
  listener_state = 0;
  Debug.setListener(listener);
  bp = Debug.setBreakPoint(f, 1);

  h();
  Debug.setListener(null);
  if (listener_exception !== null) {
    print("Exception caught: " + listener_exception);
    assertUnreachable();
  }

  assertEquals(expected_final_state, state_snapshot);
}


// Warm-up -- make sure all is compiled and ready for breakpoint.
h();

TestCase(0, "0,0,-1");
TestCase(1, "0,0,-1");
TestCase(2, "0,0,0");
TestCase(5, "0,0,1");
TestCase(8, "0,0,2");