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      1 // Copyright 2011 the V8 project authors. All rights reserved.
      2 // Redistribution and use in source and binary forms, with or without
      3 // modification, are permitted provided that the following conditions are
      4 // met:
      5 //
      6 //     * Redistributions of source code must retain the above copyright
      7 //       notice, this list of conditions and the following disclaimer.
      8 //     * Redistributions in binary form must reproduce the above
      9 //       copyright notice, this list of conditions and the following
     10 //       disclaimer in the documentation and/or other materials provided
     11 //       with the distribution.
     12 //     * Neither the name of Google Inc. nor the names of its
     13 //       contributors may be used to endorse or promote products derived
     14 //       from this software without specific prior written permission.
     15 //
     16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27 
     28 // Flags: --expose-debug-as debug
     29 // Get the Debug object exposed from the debug context global object.
     30 Debug = debug.Debug;
     31 
     32 function sendCommand(state, cmd) {
     33   // Get the debug command processor in paused state.
     34   var dcp = state.debugCommandProcessor(false);
     35   var request = JSON.stringify(cmd);
     36   var response = dcp.processDebugJSONRequest(request);
     37   return JSON.parse(response);
     38 }
     39 
     40 function listener(event, exec_state, event_data, data) {
     41   try {
     42     if (event == Debug.DebugEvent.Break) {
     43       var line = event_data.sourceLineText();
     44       print('break: ' + line);
     45 
     46       var frame = sendCommand(exec_state, {
     47         seq: 0,
     48         type: "request",
     49         command: "frame"
     50       });
     51 
     52       sendCommand(exec_state, {
     53         seq: 0,
     54         type: "request",
     55         command: "evaluate",
     56         arguments: {
     57           expression: "obj.x.toString()",
     58           additional_context: [{
     59             name: "obj",
     60             handle: frame.body.receiver.ref
     61           }]
     62         }
     63       });
     64     }
     65   } catch (e) {
     66     print(e);
     67   }
     68 }
     69 
     70 Debug.setListener(listener);
     71 
     72 function a(x, y) {
     73   this.x = x;
     74   this.y = y;
     75 }
     76 
     77 Debug.setBreakPoint(a, 0, 0);
     78 new a(1, 2);