[android][debugger] Implement support to debug after hot reload

Mono.Debugger.Soft/Mono.Debugger.Soft/Connection.cs

@@ -483,7 +483,9 @@ enum EventKind {
 			KEEPALIVE = 14,
 			USER_BREAK = 15,
 			USER_LOG = 16,
-			CRASH = 17
+			CRASH = 17,
+			ENC_UPDATE = 18,
+			METHOD_UPDATE = 19,
 		}
 
 		enum ModifierKind {
@@ -1620,6 +1622,9 @@ bool ReceivePacket () {
 								//EventHandler.Exception (req_id, thread_id, id, loc);
 							} else if (kind == EventKind.KEEPALIVE) {
 								events [i] = new EventInfo (etype, req_id) { };
+							} else if (kind == EventKind.METHOD_UPDATE) {
+								long id = r.ReadId ();
+								events[i] = new EventInfo (etype, req_id) { ThreadId = thread_id, Id = id };
 							} else {
 								throw new NotImplementedException ("Unknown event kind: " + kind);
 							}

Mono.Debugger.Soft/Mono.Debugger.Soft/EncEvents.cs

@@ -0,0 +1,20 @@
+
+namespace Mono.Debugger.Soft
+{
+	public class MethodUpdateEvent : Event
+	{
+		long id;
+		MethodMirror method;
+		internal MethodUpdateEvent (VirtualMachine vm, int req_id, long thread_id, long id) : base (EventType.MethodUpdate, vm, req_id, thread_id)
+		{
+			this.id = id;
+			method = vm.GetMethod (id);
+			method.ClearCachedLocalsDebugInfo ();
+		}
+
+		public MethodMirror GetMethod()
+		{
+			return method;
+		}
+	}
+}

Mono.Debugger.Soft/Mono.Debugger.Soft/EventRequest.cs

@@ -138,5 +138,18 @@ protected void CheckMirror (VirtualMachine vm, Mirror m) {
 			if (vm != m.VirtualMachine)
 				throw new VMMismatchException ();
 		}
+
+		//Used by EnC
+		public void UpdateReqId (int id)
+		{
+			this.id = id;
+			enabled = true;
+		}
+
+		public int GetId ()
+		{
+			return id;
+		}
+
 	}
 }

Mono.Debugger.Soft/Mono.Debugger.Soft/EventType.cs

@@ -27,8 +27,10 @@ public enum EventType {
 		//
 		UserLog = 16,
 		// Fatal error handling
-		Crash = 17,
-		// Not part of the wire protocol
+		Crash = 17,
+		EnCUpdate = 18,
+		MethodUpdate = 19,
+		// Not part of the wire protocol
 		VMDisconnect = 99
 	}
 }

Mono.Debugger.Soft/Mono.Debugger.Soft/MethodMirror.cs

@@ -33,6 +33,10 @@ public class MethodMirror : Mirror
 		internal MethodMirror (VirtualMachine vm, long id) : base (vm, id) {
 		}
 
+		public long GetId() {
+			return id;
+		}
+
 		public string Name {
 			get {
 				if (name == null)
@@ -248,6 +252,13 @@ public ParameterInfoMirror ReturnParameter {
 			}
 		}
 
+		public void ClearCachedLocalsDebugInfo ()
+		{
+			locals = null;
+			debug_info = null;
+			locations = null;
+		}
+
 		public LocalScope [] GetScopes () {
 			vm.CheckProtocolVersion (2, 43);
 			GetLocals ();

Mono.Debugger.Soft/Mono.Debugger.Soft/VirtualMachine.cs

@@ -874,6 +874,9 @@ public void Events (SuspendPolicy suspend_policy, EventInfo[] events) {
 				case EventType.Crash:
 					l.Add (new CrashEvent (vm, req_id, thread_id, ei.Dump, ei.Hash));
 					break;
+				case EventType.MethodUpdate:
+					l.Add (new MethodUpdateEvent (vm, req_id, thread_id, id));
+					break;
 				}
 			}
 

Mono.Debugging.Soft/SoftDebuggerSession.cs

@@ -602,6 +602,9 @@ void ConnectionStarted (VirtualMachine machine)
 				machine.EnableEvents (EventType.TypeLoad);
 			}
 
+
+			machine.EnableEvents (EventType.MethodUpdate);
+
 			started = true;
 
 			/* Wait for the VMStart event */
@@ -1347,6 +1350,17 @@ void InsertBreakpoint (Breakpoint bp, BreakInfo bi)
 			InsertBreakpoint (bp, bi, bi.Location.Method, bi.Location.ILOffset);
 		}
 
+		void UpdateBreakpoint (Breakpoint bp, BreakInfo bi)
+		{
+			foreach (var req in bi.Requests)
+			{
+				req.Key.Disable ();
+				var request = vm.SetBreakpoint (bi.Location.Method, bi.Location.ILOffset);
+				req.Key.UpdateReqId (request.GetId());
+				req.Key.Enabled = bp.Enabled;
+			}
+		}
+
 		void InsertBreakpoint (Breakpoint bp, BreakInfo bi, MethodMirror method, int ilOffset)
 		{
 			EventRequest request;
@@ -1858,6 +1872,9 @@ void HandleEventSet (EventSet es)
 			case EventType.UserLog:
 				HandleUserLogEvents (Array.ConvertAll (es.Events, item => (UserLogEvent)item));
 				break;
+			case EventType.MethodUpdate:
+				HandleMethodUpdateEvents (Array.ConvertAll (es.Events, item => (MethodUpdateEvent)item));
+				break;
 			default:
 				DebuggerLoggingService.LogMessage ("Ignoring unknown debugger event type {0}", type);
 				break;
@@ -2391,6 +2408,22 @@ void HandleUserLogEvents (UserLogEvent[] events)
 				OnTargetDebug (ul.Level, ul.Category, ul.Message);
 		}
 
+		void HandleMethodUpdateEvents(MethodUpdateEvent[] methods)
+		{
+			foreach (var method in methods)
+			{
+				foreach (var bp in breakpoints) {
+					if (bp.Value.Location.Method.GetId() == method.GetMethod().GetId())
+					{
+						bool dummy = false;
+						var l = FindLocationByMethod (bp.Value.Location.Method, bp.Value.Location.SourceFile, bp.Value.Location.LineNumber, bp.Value.Location.ColumnNumber, ref dummy);
+						bp.Value.Location = l;
+						UpdateBreakpoint ((Breakpoint)bp.Value.BreakEvent, bp.Value);
+					}
+				}
+			}
+		}
+
 		public ObjectMirror GetExceptionObject (ThreadMirror thread)
 		{
 			ObjectMirror obj;