v8/test/mjsunit/debug-suspend.js

// Copyright 2008 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

// Simple function which stores the last debug event.
listenerComplete = false;
exception = false;

var base_backtrace_request = '"seq":0,"type":"request","command":"backtrace"'
var base_suspend_request = '"seq":0,"type":"request","command":"suspend"'

function safeEval(code) {
  try {
    return eval('(' + code + ')');
  } catch (e) {
    assertEquals(void 0, e);
    return undefined;
  }
}

function testArguments(exec_state) {
  // Get the debug command processor in running state.
  var dcp = exec_state.debugCommandProcessor(true);

  assertTrue(dcp.isRunning());

  var backtrace_request = '{' + base_backtrace_request + '}'
  var backtrace_response = safeEval(dcp.processDebugJSONRequest(backtrace_request));

  assertTrue(backtrace_response.success);

  assertTrue(backtrace_response.running, backtrace_request + ' -> expected running');

  assertTrue(dcp.isRunning());

  var suspend_request = '{' + base_suspend_request + '}'
  var suspend_response = safeEval(dcp.processDebugJSONRequest(suspend_request));

  assertTrue(suspend_response.success);

  assertFalse(suspend_response.running, suspend_request + ' -> expected not running');

  assertFalse(dcp.isRunning());
}

function listener(event, exec_state, event_data, data) {
  try {
    if (event == Debug.DebugEvent.Break) {

      // Test simple suspend request.
      testArguments(exec_state);

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

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

// Stop debugger and check that suspend command changes running flag.
debugger;

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