Enable asynchronous remote debugging with d8.

src/d8.cc

Index: src/d8.cc
diff --git a/src/d8.cc b/src/d8.cc
index 9e409977e3e8d7ff7be5800e926a586e4080f004..9ce1507ad60448512466d13d2c9f58dcbc175ad3 100644
--- a/src/d8.cc
+++ b/src/d8.cc
@@ -241,7 +241,12 @@ Handle<String> Shell::ReadFromStdin() {
     // Continue reading if the line ends with an escape '\\' or the line has
     // not been fully read into the buffer yet (does not end with '\n').
     // If fgets gets an error, just give up.
-    if (fgets(buffer, kBufferSize, stdin) == NULL) return Handle<String>();
+    char* input = NULL;
+    {  // Release lock for blocking input.
+      Unlocker unlock(Isolate::GetCurrent());
+      input = fgets(buffer, kBufferSize, stdin);
+    }
+    if (input == NULL) return Handle<String>();
     length = static_cast<int>(strlen(buffer));
     if (length == 0) {
       return accumulator;
@@ -604,6 +609,13 @@ Handle<Value> Shell::DebugCommandToJSONRequest(Handle<String> command) {
   Handle<Value> val = Handle<Function>::Cast(fun)->Call(global, kArgc, argv);
   return val;
 }
+
+
+void Shell::DispatchDebugMessages() {
+  printf("message trying to be dispatched\n");

[Jakob Kummerow, 2012/01/20 11:53:31]

intentional?

[Yang, 2012/01/20 11:59:51]

Forgot to remove this debug message. Done.

+  v8::Context::Scope scope(Shell::evaluation_context_);
+  v8::Debug::ProcessDebugMessages();
+}
 #endif  // ENABLE_DEBUGGER_SUPPORT
 #endif  // V8_SHARED
 
@@ -873,6 +885,7 @@ void Shell::Initialize() {
   // Start the debugger agent if requested.
   if (i::FLAG_debugger_agent) {
     v8::Debug::EnableAgent("d8 shell", i::FLAG_debugger_port, true);
+    v8::Debug::SetDebugMessageDispatchHandler(DispatchDebugMessages, true);
   }
 #endif  // ENABLE_DEBUGGER_SUPPORT
 #endif  // V8_SHARED