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      1 // Copyright 2008 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 #ifndef V8_D8_DEBUG_H_
     29 #define V8_D8_DEBUG_H_
     30 
     31 
     32 #include "d8.h"
     33 #include "debug.h"
     34 
     35 
     36 namespace v8 {
     37 
     38 
     39 void HandleDebugEvent(DebugEvent event,
     40                       Handle<Object> exec_state,
     41                       Handle<Object> event_data,
     42                       Handle<Value> data);
     43 
     44 // Start the remove debugger connecting to a V8 debugger agent on the specified
     45 // port.
     46 void RunRemoteDebugger(int port);
     47 
     48 // Forward declerations.
     49 class RemoteDebuggerEvent;
     50 class ReceiverThread;
     51 
     52 
     53 // Remote debugging class.
     54 class RemoteDebugger {
     55  public:
     56   RemoteDebugger(i::Isolate* isolate, int port)
     57       : port_(port),
     58         event_access_(i::OS::CreateMutex()),
     59         event_available_(i::OS::CreateSemaphore(0)),
     60         head_(NULL), tail_(NULL), isolate_(isolate) {}
     61   void Run();
     62 
     63   // Handle events from the subordinate threads.
     64   void MessageReceived(i::SmartPointer<char> message);
     65   void KeyboardCommand(i::SmartPointer<char> command);
     66   void ConnectionClosed();
     67 
     68  private:
     69   // Add new debugger event to the list.
     70   void AddEvent(RemoteDebuggerEvent* event);
     71   // Read next debugger event from the list.
     72   RemoteDebuggerEvent* GetEvent();
     73 
     74   // Handle a message from the debugged V8.
     75   void HandleMessageReceived(char* message);
     76   // Handle a keyboard command.
     77   void HandleKeyboardCommand(char* command);
     78 
     79   // Get connection to agent in debugged V8.
     80   i::Socket* conn() { return conn_; }
     81 
     82   int port_;  // Port used to connect to debugger V8.
     83   i::Socket* conn_;  // Connection to debugger agent in debugged V8.
     84 
     85   // Linked list of events from debugged V8 and from keyboard input. Access to
     86   // the list is guarded by a mutex and a semaphore signals new items in the
     87   // list.
     88   i::Mutex* event_access_;
     89   i::Semaphore* event_available_;
     90   RemoteDebuggerEvent* head_;
     91   RemoteDebuggerEvent* tail_;
     92   i::Isolate* isolate_;
     93 
     94   friend class ReceiverThread;
     95 };
     96 
     97 
     98 // Thread reading from debugged V8 instance.
     99 class ReceiverThread: public i::Thread {
    100  public:
    101   ReceiverThread(i::Isolate* isolate, RemoteDebugger* remote_debugger)
    102       : Thread(isolate, "d8:ReceiverThrd"),
    103         remote_debugger_(remote_debugger) {}
    104   ~ReceiverThread() {}
    105 
    106   void Run();
    107 
    108  private:
    109   RemoteDebugger* remote_debugger_;
    110 };
    111 
    112 
    113 // Thread reading keyboard input.
    114 class KeyboardThread: public i::Thread {
    115  public:
    116   explicit KeyboardThread(i::Isolate* isolate, RemoteDebugger* remote_debugger)
    117       : Thread(isolate, "d8:KeyboardThrd"),
    118         remote_debugger_(remote_debugger) {}
    119   ~KeyboardThread() {}
    120 
    121   void Run();
    122 
    123  private:
    124   RemoteDebugger* remote_debugger_;
    125 };
    126 
    127 
    128 // Events processed by the main deubgger thread.
    129 class RemoteDebuggerEvent {
    130  public:
    131   RemoteDebuggerEvent(int type, i::SmartPointer<char> data)
    132       : type_(type), data_(data), next_(NULL) {
    133     ASSERT(type == kMessage || type == kKeyboard || type == kDisconnect);
    134   }
    135 
    136   static const int kMessage = 1;
    137   static const int kKeyboard = 2;
    138   static const int kDisconnect = 3;
    139 
    140   int type() { return type_; }
    141   char* data() { return *data_; }
    142 
    143  private:
    144   void set_next(RemoteDebuggerEvent* event) { next_ = event; }
    145   RemoteDebuggerEvent* next() { return next_; }
    146 
    147   int type_;
    148   i::SmartPointer<char> data_;
    149   RemoteDebuggerEvent* next_;
    150 
    151   friend class RemoteDebugger;
    152 };
    153 
    154 
    155 }  // namespace v8
    156 
    157 
    158 #endif  // V8_D8_DEBUG_H_
    159