v8/test/debugger/debug/regress/regress-94873.js

// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
//       copyright notice, this list of conditions and the following
//       disclaimer in the documentation and/or other materials provided
//       with the distribution.
//     * Neither the name of Google Inc. nor the names of its
//       contributors may be used to endorse or promote products derived
//       from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Debug = debug.Debug;

function sendCommand(state, cmd) {
  // Get the debug command processor in paused state.
  var dcp = state.debugCommandProcessor(false);
  var request = JSON.stringify(cmd);
  var response = dcp.processDebugJSONRequest(request);
  return JSON.parse(response);
}

function listener(event, exec_state, event_data, data) {
  try {
    if (event == Debug.DebugEvent.Break) {
      var line = event_data.sourceLineText();
      print('break: ' + line);

      var frame = sendCommand(exec_state, {
        seq: 0,
        type: "request",
        command: "frame"
      });

      sendCommand(exec_state, {
        seq: 0,
        type: "request",
        command: "evaluate",
        arguments: {
          expression: "obj.x.toString()",
          additional_context: [{
            name: "obj",
            handle: frame.body.receiver.ref
          }]
        }
      });
    }
  } catch (e) {
    print(e);
  }
}

Debug.setListener(listener);

function a(x, y) {
  this.x = x;
  this.y = y;
}

Debug.setBreakPoint(a, 0, 0);
new a(1, 2);