Add MarkEventsWithUniqueIdPass pass for global event handling.

src/Generator/Driver.cs

@@ -291,6 +291,8 @@ namespace CppSharp
             }
 
             Context.TranslationUnitPasses.AddPass(new HandleVariableInitializerPass());
+
+            TranslationUnitPasses.AddPass(new MarkEventsWithUniqueIdPass());
         }
 
         public void ProcessCode()

src/Generator/Passes/MarkEventsWithUniqueIdPass.cs

@@ -0,0 +1,31 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using CppSharp.AST;
+using CppSharp.AST.Extensions;
+using CppSharp.Passes;
+using Type = CppSharp.AST.Type;
+
+namespace CppSharp
+{
+    /// <summary>
+    /// This pass sets each event in the AST with a global unique ID.
+    /// </summary>
+    public class MarkEventsWithUniqueIdPass : TranslationUnitPass
+    {
+        private int eventId = 1;
+        public Dictionary<Event, int> EventIds = new Dictionary<Event, int>();
+
+        public override bool VisitEvent(Event @event)
+        {
+            if (AlreadyVisited(@event))
+                return true;
+
+            if (@event.GlobalId != 0)
+                throw new NotSupportedException();
+
+            @event.GlobalId = eventId++;
+            return base.VisitEvent(@event);
+        }
+    }
+}