v8/test/mjsunit/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:
//
//     * Redistributions of source code must retain the above copyright
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//       copyright notice, this list of conditions and the following
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//       with the distribution.
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//
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// Flags: --expose-debug-as debug
// Get the Debug object exposed from the debug context global object.
Debug = debug.Debug

listenerComplete = false;
exception = false;

// The base part of all evaluate requests.
var base_request = '"seq":0,"type":"request","command":"evaluate"'

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

function testRequest(dcp, arguments, success, result) {
  // Generate request with the supplied arguments.
  var request;
  if (arguments) {
    request = '{' + base_request + ',"arguments":' + arguments + '}';
  } else {
    request = '{' + base_request + '}'
  }
  var response = safeEval(dcp.processDebugJSONRequest(request));
  if (success) {
    assertTrue(response.success, request + ' -> ' + response.message);
    assertEquals(result, response.body.value);
  } else {
    assertFalse(response.success, request + ' -> ' + response.message);
  }
  assertEquals(response.running, "unspecified_running_state",
               request + ' -> expected not running');
}

function listener(event, exec_state, event_data, data) {
  try {
    if (event == Debug.DebugEvent.Break) {
      // Get the debug command processor.
      var dcp = exec_state.debugCommandProcessor("unspecified_running_state");

      // Test some illegal evaluate requests.
      testRequest(dcp, void 0, false);
      testRequest(dcp, '{"expression":"1","global"=true}', false);
      testRequest(dcp, '{"expression":"a","frame":4}', false);

      // Test some legal evaluate requests.
      testRequest(dcp, '{"expression":"1+2"}', true, 3);
      testRequest(dcp, '{"expression":"a+2"}', true, 5);
      testRequest(dcp, '{"expression":"({\\"a\\":1,\\"b\\":2}).b+2"}', true, 4);

      // Test evaluation of a in the stack frames and the global context.
      testRequest(dcp, '{"expression":"a"}', true, 3);
      testRequest(dcp, '{"expression":"a","frame":0}', true, 3);
      testRequest(dcp, '{"expression":"a","frame":1}', true, 2);
      testRequest(dcp, '{"expression":"a","frame":2}', true, 1);
      testRequest(dcp, '{"expression":"a","global":true}', true, 1);
      testRequest(dcp, '{"expression":"this.a","global":true}', true, 1);

      // Test that the whole string text is returned if maxStringLength
      // parameter is passed.
      testRequest(
          dcp,
          '{"expression":"this.longString","global":true,"maxStringLength":-1}',
          true,
          longString);
      testRequest(
          dcp,
          '{"expression":"this.longString","global":true,"maxStringLength":' +
              longString.length + '}',
          true,
          longString);
      var truncatedStringSuffix = '... (length: ' + longString.length + ')';
      testRequest(
          dcp,
          '{"expression":"this.longString","global":true,"maxStringLength":0}',
          true,
          truncatedStringSuffix);
      testRequest(
          dcp,
          '{"expression":"this.longString","global":true,"maxStringLength":1}',
          true,
          longString.charAt(0) + truncatedStringSuffix);
      // Test that by default string is truncated to first 80 chars.
      testRequest(
          dcp,
          '{"expression":"this.longString","global":true}',
          true,
          longString.substring(0, 80) + truncatedStringSuffix);

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

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