gdb: dynamic rcmd system & more cleanups

src/Ryujinx.HLE/Debugger/Message.cs

@@ -0,0 +1,47 @@
+using Ryujinx.Cpu;
+
+namespace Ryujinx.HLE.Debugger
+{
+    public enum MessageType
+    {
+        Kill,
+        BreakIn,
+        SendNack
+    }
+
+    record struct Message(MessageType Type) : Message.IMarker
+    {
+        /// <summary>
+        ///     Marker interface for debugger messages.
+        /// </summary>
+        internal interface IMarker;
+
+        public static Message Kill => new(MessageType.Kill);
+        public static Message BreakIn => new(MessageType.BreakIn);
+        public static Message SendNack => new(MessageType.SendNack);
+    }
+
+    struct CommandMessage : Message.IMarker
+    {
+        public readonly string Command;
+
+        public CommandMessage(string cmd)
+        {
+            Command = cmd;
+        }
+    }
+    
+    public class ThreadBreakMessage : Message.IMarker
+    {
+        public IExecutionContext Context { get; }
+        public ulong Address { get; }
+        public int Opcode { get; }
+
+        public ThreadBreakMessage(IExecutionContext context, ulong address, int opcode)
+        {
+            Context = context;
+            Address = address;
+            Opcode = opcode;
+        }
+    }
+}