v8/test/mjsunit/regress/regress-crbug-171715.js

// Copyright 2013 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
// Flags: --turbo-deoptimization

Debug = debug.Debug

var error = null;
var test = 0;

function check_v(expected, exec_state, frame_id) {
  assertEquals(expected, exec_state.frame(frame_id).evaluate('v').value());
}

function listener(event, exec_state, event_data, data) {
  try {
    if (event != Debug.DebugEvent.Break) return;
    test++;
    if (test == 1) {
      check_v('inner0', exec_state, 0);
      check_v('inner0', exec_state, 1);
      check_v('outer',  exec_state, 2);
      assertArrayEquals(["a", "b", "c"],
                        exec_state.frame(0).evaluate('arguments').value());
    } else if (test == 2) {
      check_v('inner1', exec_state, 0);
      check_v('inner1', exec_state, 1);
      check_v('outer',  exec_state, 2);
      assertArrayEquals(["a", "b", "c"],
                        exec_state.frame(0).evaluate('arguments').value());
    } else {
      assertEquals(3, test);
      check_v('inner2', exec_state, 0);
      check_v('inner1', exec_state, 1);
      check_v('inner1', exec_state, 2);
      check_v('outer',  exec_state, 3);
      assertArrayEquals(["x", "y", "z"],
                        exec_state.frame(0).evaluate('arguments').value());
      assertArrayEquals(["a", "b", "c"],
                        exec_state.frame(1).evaluate('arguments').value());
    }
  } catch (e) {
    error = e;
  }
};

Debug.setListener(listener);

var v = 'outer';
(function() {  // Test 1 and 2
  var v = 'inner0';
  eval("debugger; var v = 'inner1'; debugger;");
  assertEquals('inner1', v);  // Overwritten by local eval.
})("a", "b", "c");
assertNull(error);

(function() {  // Test 3
  var v = 'inner0';  // Local eval overwrites this value.
  eval("var v = 'inner1'; " +
       "(function() { var v = 'inner2'; debugger; })('x', 'y', 'z');");
  assertEquals('inner1', v);  // Overwritten by local eval.
})("a", "b", "c");
assertNull(error);