CSE2410 Fall 2014 Bounce

// Copyright 2008 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.

#ifndef V8_D8_DEBUG_H_

#define V8_D8_DEBUG_H_

#include "d8.h"

#include "debug.h"

namespace v8 {

void HandleDebugEvent(DebugEvent event,

                      Handle<Object> exec_state,

                      Handle<Object> event_data,

                      Handle<Value> data);

// Start the remove debugger connecting to a V8 debugger agent on the specified

// port.

void RunRemoteDebugger(int port);

// Forward declerations.

class RemoteDebuggerEvent;

class ReceiverThread;

// Remote debugging class.

class RemoteDebugger {

 public:

  explicit RemoteDebugger(int port)

      : port_(port),

        event_access_(i::OS::CreateMutex()),

        event_available_(i::OS::CreateSemaphore(0)),

        head_(NULL), tail_(NULL) {}

  void Run();

  // Handle events from the subordinate threads.

  void MessageReceived(i::SmartPointer<char> message);

  void KeyboardCommand(i::SmartPointer<char> command);

  void ConnectionClosed();

 private:

  // Add new debugger event to the list.

  void AddEvent(RemoteDebuggerEvent* event);

  // Read next debugger event from the list.

  RemoteDebuggerEvent* GetEvent();

  // Handle a message from the debugged V8.

  void HandleMessageReceived(char* message);

  // Handle a keyboard command.

  void HandleKeyboardCommand(char* command);

  // Get connection to agent in debugged V8.

  i::Socket* conn() { return conn_; }

  int port_;  // Port used to connect to debugger V8.

  i::Socket* conn_;  // Connection to debugger agent in debugged V8.

  // Linked list of events from debugged V8 and from keyboard input. Access to

  // the list is guarded by a mutex and a semaphore signals new items in the

  // list.

  i::Mutex* event_access_;

  i::Semaphore* event_available_;

  RemoteDebuggerEvent* head_;

  RemoteDebuggerEvent* tail_;

  friend class ReceiverThread;

};

// Thread reading from debugged V8 instance.

class ReceiverThread: public i::Thread {

 public:

  explicit ReceiverThread(RemoteDebugger* remote_debugger)

      : remote_debugger_(remote_debugger) {}

  ~ReceiverThread() {}

  void Run();

 private:

  RemoteDebugger* remote_debugger_;

};

// Thread reading keyboard input.

class KeyboardThread: public i::Thread {

 public:

  explicit KeyboardThread(RemoteDebugger* remote_debugger)

      : remote_debugger_(remote_debugger) {}

  ~KeyboardThread() {}

  void Run();

 private:

  RemoteDebugger* remote_debugger_;

};

// Events processed by the main deubgger thread.

class RemoteDebuggerEvent {

 public:

  RemoteDebuggerEvent(int type, i::SmartPointer<char> data)

      : type_(type), data_(data), next_(NULL) {

    ASSERT(type == kMessage || type == kKeyboard || type == kDisconnect);

  }

  static const int kMessage = 1;

  static const int kKeyboard = 2;

  static const int kDisconnect = 3;

  int type() { return type_; }

  char* data() { return *data_; }

 private:

  void set_next(RemoteDebuggerEvent* event) { next_ = event; }

  RemoteDebuggerEvent* next() { return next_; }

  int type_;

  i::SmartPointer<char> data_;

  RemoteDebuggerEvent* next_;

  friend class RemoteDebugger;

};

}  // namespace v8

#endif  // V8_D8_DEBUG_H_