[Mono-bugs] [Bug 44547][Nor] Changed - mono aborts in emit_struct_conv with failed assertion running Qt# apps

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Changed by j@bitron.ch.

http://bugzilla.ximian.com/show_bug.cgi?id=44547

--- shadow/44547	Wed Jun 11 15:51:42 2003
+++ shadow/44547.tmp.2230	Thu Jun 12 12:37:50 2003
@@ -1,14 +1,14 @@
 Bug#: 44547
 Product: Mono/Runtime
 Version: unspecified
-OS: 
+OS: unknown
 OS Details: 
 Status: NEW   
 Resolution: 
-Severity: 
+Severity: Unknown
 Priority: Normal
 Component: misc
 AssignedTo: mono-bugs@ximian.com                            
 ReportedBy: mathpup@mylinuxisp.com               
 QAContact: mono-bugs@ximian.com
 TargetMilestone: ---
@@ -50,6 +50,69 @@
  
  
 Additional Information: 
  
 I will try to narrow this down a little, but historically I haven't been successful at 
 pinpointing these types of errors.
+
+------- Additional Comments From j@bitron.ch  2003-06-12 12:37 -------
+I have the same problem with a self-written app. It seems to be a
+problem with union-like structs. Using "LayoutStruct.Explicit" and
+multiple "FieldOffset"s with the same offset triggers the bug.
+
+Used mono version is 0.24. Mono 0.23 didn't have this bug.
+
+Extracted example:
+
+[StructLayout(LayoutKind.Sequential)]
+internal struct XClientMessageEvent
+{
+	[StructLayout(LayoutKind.Sequential)]
+	internal struct ByteMessage
+	{
+		public sbyte b0;
+		public sbyte b1;
+		public sbyte b2;
+		public sbyte b3;
+		public sbyte b4;
+		public sbyte b5;
+		public sbyte b6;
+		public sbyte b7;
+		public sbyte b8;
+		public sbyte b9;
+		public sbyte b10;
+		public sbyte b11;
+		public sbyte b12;
+		public sbyte b13;
+		public sbyte b14;
+		public sbyte b15;
+		public sbyte b16;
+		public sbyte b17;
+		public sbyte b18;
+		public sbyte b19;
+	}
+	[StructLayout(LayoutKind.Sequential)]
+        internal struct LongMessage
+        {
+                public int s0;
+                public int s1;
+                public int s2;
+                public int s3;
+                public int s4;
+ 
+        } // struct LongMessage
+        [StructLayout(LayoutKind.Explicit)]
+        internal struct Message
+        {
+		[FieldOffset(0)] public ByteMessage  b;
+                [FieldOffset(0)] public LongMessage  l;
+ 
+        } // struct Message
+ 
+        // Structure fields.
+        public XAnyEvent common;
+        public IntPtr message_type;
+        public int format;
+        public Message data;
+ 
+}
+