v8/test/mjsunit/debug-stepout-recursive-function.js

// Copyright 2009 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
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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

var exception = null;
var step_out_count = 1;

// Simple debug event handler which counts the number of breaks hit and steps.
var break_point_hit_count = 0;
function listener(event, exec_state, event_data, data) {
  try {
    if (event == Debug.DebugEvent.Break) {
      break_point_hit_count++;
      // Continue stepping until returned to bottom frame.
      if (exec_state.frameCount() > 1) {
        exec_state.prepareStep(Debug.StepAction.StepOut, step_out_count);
      }

    }
  } catch(e) {
    exception = e;
  }

};

function BeginTest(name) {
  test_name = name;
  break_point_hit_count = 0;
  exception = null;
}

function EndTest(expected_break_point_hit_count) {
  assertEquals(expected_break_point_hit_count, break_point_hit_count, test_name);
  assertNull(exception, test_name);
  test_name = null;
}

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


var shouldBreak = null;
function fact(x) {
  if (shouldBreak(x)) {
    debugger;
  }
  if (x < 2) {
    return 1;
  } else {
    return x*fact(x-1);
  }
}

BeginTest('Test 1');
shouldBreak = function(x) { return x == 3; };
step_out_count = 1;
fact(3);
EndTest(2);

BeginTest('Test 2');
shouldBreak = function(x) { return x == 2; };
step_out_count = 1;
fact(3);
EndTest(3);

BeginTest('Test 3');
shouldBreak = function(x) { return x == 1; };
step_out_count = 2;
fact(3);
EndTest(2);

BeginTest('Test 4');
shouldBreak = function(x) { return x == 1 || x == 3; };
step_out_count = 2;
fact(3);
EndTest(3);

// Get rid of the debug event listener.
Debug.setListener(null);