Added automatic debug break for processing debugger commands

src/debug.h

 // Copyright 2006-2008 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
@@ skipping 400 matching lines @@
                                        bool* caught_exception);
   static Handle<Object> MakeExceptionEvent(Handle<Object> exec_state,
                                            Handle<Object> exception,
                                            bool uncaught,
                                            bool* caught_exception);
   static Handle<Object> MakeNewFunctionEvent(Handle<Object> func,
                                              bool* caught_exception);
   static Handle<Object> MakeCompileEvent(Handle<Script> script,
                                          bool before,
                                          bool* caught_exception);
-  static void OnDebugBreak(Handle<Object> break_points_hit);
+  static void OnDebugBreak(Handle<Object> break_points_hit, bool auto_continue);
   static void OnException(Handle<Object> exception, bool uncaught);
   static void OnBeforeCompile(Handle<Script> script);
   static void OnAfterCompile(Handle<Script> script,
                            Handle<JSFunction> fun);
   static void OnNewFunction(Handle<JSFunction> fun);
   static void ProcessDebugEvent(v8::DebugEvent event,
-                                Handle<Object> event_data);
+                                Handle<Object> event_data,
+                                bool auto_continue);
   static void SetEventListener(Handle<Object> callback, Handle<Object> data);
   static void SetMessageHandler(v8::DebugMessageHandler handler, void* data);
   static void SetHostDispatchHandler(v8::DebugHostDispatchHandler handler,
                                      void* data);
   static void SendMessage(Vector<uint16_t> message);
   static void ProcessCommand(Vector<const uint16_t> command);
+  static bool HasCommands();
   static void ProcessHostDispatch(void* dispatch);
   static void UpdateActiveDebugger();
   static Handle<Object> Call(Handle<JSFunction> fun,
                              Handle<Object> data,
                              bool* pending_exception);
 
   // Start the debugger agent listening on the provided port.
   static bool StartAgent(int port);
 
   inline static bool EventActive(v8::DebugEvent event) {
@@ skipping 76 matching lines @@
  */
 class DebugMessageThread: public Thread {
  public:
   DebugMessageThread();  // Called from API thread.
   virtual ~DebugMessageThread();  // Never called.
   // Called by V8 thread.  Reports events from V8 VM.
   // Also handles command processing in stopped state of V8,
   // when host_running_ is false.
   void DebugEvent(v8::DebugEvent,
                   Handle<Object> exec_state,
-                  Handle<Object> event_data);
+                  Handle<Object> event_data,
+                  bool auto_continue);
   // Puts event on the output queue.  Called by V8.
   // This is where V8 hands off
   // processing of the event to the DebugMessageThread thread,
   // which forwards it to the debug_message_handler set by the API.
   void SendMessage(Vector<uint16_t> event_json);
   // Formats an event into JSON, and calls SendMessage.
   bool SetEventJSONFromEvent(Handle<Object> event_data);
   // Puts a command coming from the public API on the queue.  Called
   // by the API client thread.  This is where the API client hands off
   // processing of the command to the DebugMessageThread thread.
   void ProcessCommand(Vector<uint16_t> command);
   void ProcessHostDispatch(void* dispatch);
   void OnDebuggerInactive();
 
   // Main function of DebugMessageThread thread.
   void Run();
 
+  // Check whether there are commands in the queue.
+  bool HasCommands() { return !command_queue_.IsEmpty(); }
+
   bool host_running_;  // Is the debugging host running or stopped?
   Semaphore* command_received_;  // Non-zero when command queue is non-empty.
   Semaphore* message_received_;  // Exactly equal to message queue length.
  private:
   bool TwoByteEqualsAscii(Vector<uint16_t> two_byte, const char* ascii);
 
   static const int kQueueInitialSize = 4;
   LockingMessageQueue command_queue_;
   LockingMessageQueue message_queue_;
   DISALLOW_COPY_AND_ASSIGN(DebugMessageThread);
@@ skipping 50 matching lines @@
     Debug::SetBreak(break_frame_id_, break_id_);
 
     // Request preemption when leaving the last debugger entry and a preemption
     // had been recorded while debugging. This is to avoid starvation in some
     // debugging scenarios.
     if (prev_ == NULL && Debug::preemption_pending()) {
       StackGuard::Preempt();
       Debug::set_preemption_pending(false);
     }
 
+    // If there are commands in the queue when leaving the debugger request that
+    // these commands are processed.
+    if (prev_ == NULL && Debugger::HasCommands()) {
+      StackGuard::DebugCommand();
+    }
+
     // Leaving this debugger entry.
     Debug::set_debugger_entry(prev_);
   }
 
   // Check whether the debugger could be entered.
   inline bool FailedToEnter() { return load_failed_; }
 
   // Check whether there are any JavaScript frames on the stack.
   inline bool HasJavaScriptFrames() { return has_js_frames_; }
 
@@ skipping 64 matching lines @@
   }
  private:
   Debug::AddressId id_;
   int reg_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_V8_DEBUG_H_