v8/test/debugger/debug/debug-function-scopes.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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var Debug = debug.Debug;

const ScopeType = debug.ScopeType;

let exception = null;
let listenerDelegate = null;

const expected_break_count = 5;
let break_count = 0;

Debug.setListener(function(event, exec_state, event_data, data) {
  if (event != Debug.DebugEvent.Break) return;
  try {
    break_count++;
    listenerDelegate(exec_state);
  } catch (e) {
    exception = e;
    print(e, e.stack);
  }
});

function CheckScope(scope_frame, scope_expectations, expected_scope_type) {
  assertEquals(expected_scope_type, scope_frame.scopeType());

  var scope_object = scope_frame.scopeObject().value();

  for (var name in scope_expectations) {
    var actual = scope_object[name];
    var expected = scope_expectations[name];
    assertEquals(expected, actual);
  }
}

// ---

listenerDelegate = function(exec_state) {
  const frame = exec_state.frame(0);

  assertEquals(7, frame.scopeCount());

  CheckScope(frame.scope(0), {}, ScopeType.Local);
  CheckScope(frame.scope(1), { a: 4, b: 5 }, ScopeType.Closure);
  CheckScope(frame.scope(2), { w: 5, v: "Capybara" }, ScopeType.With);
  CheckScope(frame.scope(3), { z: 22 }, ScopeType.Closure);
  CheckScope(frame.scope(4), { x: 5 }, ScopeType.Closure);
  CheckScope(frame.scope(5), {}, ScopeType.Script);
  CheckScope(frame.scope(6), {}, ScopeType.Global);
};

(function F1(x) {
  function F2(y) {
    var z = x + y;
    with ({w: 5, v: "Capybara"}) {
      var F3 = function(a, b) {
        function F4(p) {
          debugger;
          return p + a + b + z + w + v.length;
        }
        return F4;
      }
      return F3(4, 5);
    }
  }
  return F2(17);
})(5)();

// ---

listenerDelegate = function(exec_state) {
  const frame = exec_state.frame(0);

  assertEquals(3, frame.scopeCount());

  CheckScope(frame.scope(0), {}, ScopeType.Local);
  CheckScope(frame.scope(1), {}, ScopeType.Script);
  CheckScope(frame.scope(2), {}, ScopeType.Global);
};

(function() { debugger; return 5; })();

// ---

listenerDelegate = function(exec_state) {
  const frame = exec_state.frame(0);

  assertEquals(6, frame.scopeCount());

  CheckScope(frame.scope(0), {}, ScopeType.Local);
  CheckScope(frame.scope(1), { visible2: 20 }, ScopeType.Closure);
  CheckScope(frame.scope(2), { invisible2: undefined }, ScopeType.Closure);
  CheckScope(frame.scope(3), { visible1: 10, invisible1: undefined }, ScopeType.Closure);
  CheckScope(frame.scope(4), {}, ScopeType.Script);
  CheckScope(frame.scope(5), {}, ScopeType.Global);
};

(function F1(invisible_parameter) {
  var invisible1 = 1;
  var visible1 = 10;
  return (function F2() {
    var invisible2 = 2;
    return (function F3() {
      var visible2 = 20;
      return (function () { debugger; return visible1 + visible2; });
    })();
  })();
})(5)();

// ---

listenerDelegate = function(exec_state) {
  const frame = exec_state.frame(0);

  assertEquals(6, frame.scopeCount());

  CheckScope(frame.scope(0), {}, ScopeType.Local);
  CheckScope(frame.scope(1), { e2: "I'm error 2" }, ScopeType.Catch);
  CheckScope(frame.scope(2), { e1: "I'm error 1" }, ScopeType.Catch);
  CheckScope(frame.scope(3), {}, ScopeType.Closure);
  CheckScope(frame.scope(4), {}, ScopeType.Script);
  CheckScope(frame.scope(5), {}, ScopeType.Global);
};

(function One() {
  try {
    throw "I'm error 1";
  } catch (e1) {
    try {
      throw "I'm error 2";
    } catch (e2) {
      return function GetError() {
        debugger;
        return e1 + e2;
      };
    }
  }
})()();

// ---

listenerDelegate = function(exec_state) {
  const frame = exec_state.frame(0);

  assertEquals(5, frame.scopeCount());

  CheckScope(frame.scope(0), {}, ScopeType.Local);
  CheckScope(frame.scope(1), { p4: 20, p6: 22 }, ScopeType.Closure);
  CheckScope(frame.scope(2), { p1: 1 }, ScopeType.Closure);
  CheckScope(frame.scope(3), {}, ScopeType.Script);
  CheckScope(frame.scope(4), {}, ScopeType.Global);
};

(function Raz(p1, p2) {
  var p3 = p1 + p2;
  return (function() {
    var p4 = 20;
    var p5 = 21;
    var p6 = 22;
    return eval("(function(p7){ debugger; return p1 + p4 + p6 + p7})");
  })();
})(1,2)();

// ---

assertNull(exception);
assertEquals(expected_break_count, break_count);