Add Module.ApplyChanges (#342)

[Mono.Debugger.Soft] add ModuleMirror.ApplyChanges
[Mono.Debugging.Soft] add SoftDebuggerSession.ApplyChanges
Related mono/mono Mono.Debugger.Soft PR: mono/mono#20889
Related dotnet/runtime PR: dotnet/runtime#49043

Contributes to dotnet/runtime#44806

Author: lambdageek

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

@@ -567,6 +567,7 @@ enum CmdAssembly {
 
 		enum CmdModule {
 			GET_INFO = 1,
+			APPLY_CHANGES = 2,
 		}
 
 		enum CmdMethod {
@@ -2357,6 +2358,11 @@ internal ModuleInfo Module_GetInfo (long id) {
 			return info;
 		}
 
+
+		internal void Module_ApplyChanges (long id, long dmeta_id, long dil_id, long dpdb_id) {
+			SendReceive (CommandSet.MODULE, (int)CmdModule.APPLY_CHANGES, new PacketWriter().WriteId (id).WriteId (dmeta_id).WriteId (dil_id).WriteId (dpdb_id));
+		}
+
 		/*
 		 * ASSEMBLY
 		 */

Mono.Debugger.Soft/Mono.Debugger.Soft/ModuleMirror.cs

@@ -70,5 +70,13 @@ public string SourceLink {
 				return info.SourceLink;
 			}
 		}
+
+		// Apply a hot reload delta to the current module
+		// Since protocol version 2.60
+		public void ApplyChanges (ArrayMirror dmeta, ArrayMirror dIL, Value dPDB) {
+		    /* dPDB is Value because it can be ArrayMirror or PrimitiveValue (vm, null) */
+		    vm.CheckProtocolVersion (2, 60);
+		    vm.conn.Module_ApplyChanges (id, dmeta.Id, dIL.Id, dPDB.Id);
+		}
 	}
 }

Mono.Debugging.Soft/SoftDebuggerSession.cs

@@ -3304,6 +3304,19 @@ public AssemblyLine[] Disassemble (StackFrame frame, int firstLine, int count)
 			return lines.ToArray ();
 		}
 
+		public void ApplyChanges (ModuleMirror module, byte[] metadataDelta, byte[] ilDelta, byte[] pdbDelta = null)
+		{
+			var rootDomain = VirtualMachine.RootDomain;
+			var metadataArray = rootDomain.CreateByteArray (metadataDelta);
+			var ilArray = rootDomain.CreateByteArray (ilDelta);
+			Value pdbArray;
+			if (pdbDelta == null)
+				pdbArray = VirtualMachine.CreateValue (null);
+			else
+				pdbArray = rootDomain.CreateByteArray (pdbDelta);
+
+			module.ApplyChanges (metadataArray, ilArray, pdbArray);
+		}
 		static string EscapeString (string text)
 		{
 			var escaped = new StringBuilder ();