v8/test/mjsunit/debug-stepin-builtin.js

// Copyright 2009 the V8 project authors. All rights reserved.
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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 state = 1;
var expected_source_line_text = null;
var expected_function_name = null;

// Simple debug event handler which first time will cause 'step in' action
// and than check that execution is paused inside function
// expected_function_name.
function listener(event, exec_state, event_data, data) {
  try {
    if (event == Debug.DebugEvent.Break) {
      if (state == 3) {
        assertEquals(expected_function_name, event_data.func().name());
        assertEquals(expected_source_line_text,
                     event_data.sourceLineText());
        state = 4;
      } else {
        exec_state.prepareStep(Debug.StepAction.StepIn);
        state++;
      }
    }
  } catch(e) {
    exception = e;
  }
};

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

var a = [1,2,3,4,5];

// Test step into function call from a function without local variables.
function testStepInArraySlice() {
  expected_function_name = 'testStepInArraySlice';
  expected_source_line_text = '}  // expected line';
  debugger;
  var s = Array.prototype.slice.call(a, 2,3);
}  // expected line

state = 1;
testStepInArraySlice();
assertNull(exception);
assertEquals(4, state);

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