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      1 // Copyright 2006-2008 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_DEBUG_AGENT_H_
     29 #define V8_DEBUG_AGENT_H_
     30 
     31 #ifdef ENABLE_DEBUGGER_SUPPORT
     32 #include "../include/v8-debug.h"
     33 #include "platform.h"
     34 
     35 namespace v8 {
     36 namespace internal {
     37 
     38 // Forward decelrations.
     39 class DebuggerAgentSession;
     40 
     41 
     42 // Debugger agent which starts a socket listener on the debugger port and
     43 // handles connection from a remote debugger.
     44 class DebuggerAgent: public Thread {
     45  public:
     46   DebuggerAgent(Isolate* isolate, const char* name, int port)
     47       : Thread(isolate, name),
     48         name_(StrDup(name)), port_(port),
     49         server_(OS::CreateSocket()), terminate_(false),
     50         session_access_(OS::CreateMutex()), session_(NULL),
     51         terminate_now_(OS::CreateSemaphore(0)),
     52         listening_(OS::CreateSemaphore(0)) {
     53     ASSERT(Isolate::Current()->debugger_agent_instance() == NULL);
     54     Isolate::Current()->set_debugger_agent_instance(this);
     55   }
     56   ~DebuggerAgent() {
     57      Isolate::Current()->set_debugger_agent_instance(NULL);
     58      delete server_;
     59   }
     60 
     61   void Shutdown();
     62   void WaitUntilListening();
     63 
     64  private:
     65   void Run();
     66   void CreateSession(Socket* socket);
     67   void DebuggerMessage(const v8::Debug::Message& message);
     68   void CloseSession();
     69   void OnSessionClosed(DebuggerAgentSession* session);
     70 
     71   SmartPointer<const char> name_;  // Name of the embedding application.
     72   int port_;  // Port to use for the agent.
     73   Socket* server_;  // Server socket for listen/accept.
     74   bool terminate_;  // Termination flag.
     75   Mutex* session_access_;  // Mutex guarging access to session_.
     76   DebuggerAgentSession* session_;  // Current active session if any.
     77   Semaphore* terminate_now_;  // Semaphore to signal termination.
     78   Semaphore* listening_;
     79 
     80   friend class DebuggerAgentSession;
     81   friend void DebuggerAgentMessageHandler(const v8::Debug::Message& message);
     82 
     83   DISALLOW_COPY_AND_ASSIGN(DebuggerAgent);
     84 };
     85 
     86 
     87 // Debugger agent session. The session receives requests from the remote
     88 // debugger and sends debugger events/responses to the remote debugger.
     89 class DebuggerAgentSession: public Thread {
     90  public:
     91   DebuggerAgentSession(Isolate* isolate, DebuggerAgent* agent, Socket* client)
     92       : Thread(isolate, "v8:DbgAgntSessn"),
     93         agent_(agent), client_(client) {}
     94 
     95   void DebuggerMessage(Vector<uint16_t> message);
     96   void Shutdown();
     97 
     98  private:
     99   void Run();
    100 
    101   void DebuggerMessage(Vector<char> message);
    102 
    103   DebuggerAgent* agent_;
    104   Socket* client_;
    105 
    106   DISALLOW_COPY_AND_ASSIGN(DebuggerAgentSession);
    107 };
    108 
    109 
    110 // Utility methods factored out to be used by the D8 shell as well.
    111 class DebuggerAgentUtil {
    112  public:
    113   static const char* const kContentLength;
    114   static const int kContentLengthSize;
    115 
    116   static SmartPointer<char> ReceiveMessage(const Socket* conn);
    117   static bool SendConnectMessage(const Socket* conn,
    118                                  const char* embedding_host);
    119   static bool SendMessage(const Socket* conn, const Vector<uint16_t> message);
    120   static bool SendMessage(const Socket* conn,
    121                           const v8::Handle<v8::String> message);
    122   static int ReceiveAll(const Socket* conn, char* data, int len);
    123 };
    124 
    125 } }  // namespace v8::internal
    126 
    127 #endif  // ENABLE_DEBUGGER_SUPPORT
    128 
    129 #endif  // V8_DEBUG_AGENT_H_
    130