v8/test/debugger/debug/debug-evaluate.js

// Copyright 2008 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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Debug = debug.Debug

let listenerComplete = false;
let exceptionThrown = false;

function listener(event, exec_state, event_data, data) {
  try {
    if (event == Debug.DebugEvent.Break) {
      assertEquals(3, exec_state.frame(0).evaluate("1+2").value());
      assertEquals(5, exec_state.frame(0).evaluate("a+2").value());
      assertEquals(4, exec_state.frame(0).evaluate("({a:1,b:2}).b+2").value());

      assertEquals(3, exec_state.frame(0).evaluate("a").value());
      assertEquals(2, exec_state.frame(1).evaluate("a").value());
      assertEquals(1, exec_state.frame(2).evaluate("a").value());

      assertEquals(1, exec_state.evaluateGlobal("a").value());
      assertEquals(1, exec_state.evaluateGlobal("this.a").value());

      assertEquals(longString,
                   exec_state.evaluateGlobal("this.longString").value());

      // Indicate that all was processed.
      listenerComplete = true;
    }
  } catch (e) {
   exceptionThrown = true;
  };
};

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

function f() {
  var a = 3;
};

function g() {
  var a = 2;
  f();
  return a;  // Use the value to prevent it being removed by DCE.
};

a = 1;

// String which is longer than 80 chars.
var longString = "1234567890_";
for (var i = 0; i < 4; i++) {
  longString += longString;
}

// Set a break point at return in f and invoke g to hit the breakpoint.
Debug.setBreakPoint(f, 2, 0);
g();

assertFalse(exceptionThrown, "exception in listener");
// Make sure that the debug event listener vas invoked.
assertTrue(listenerComplete, "listener did not run to completion");