https://bugzilla.novell.com/show_bug.cgi?id=460608
User [email protected] added comment https://bugzilla.novell.com/show_bug.cgi?id=460608#c1 Summary: Using [StructLayout (LayoutKind.Sequential, Pack=1)] Product: Mono: Compilers Version: 1.2.6 Platform: x86-64 OS/Version: Ubuntu Status: NEW Severity: Major Priority: P5 - None Component: C# AssignedTo: [email protected] ReportedBy: [email protected] QAContact: [email protected] Found By: Development Created an attachment (id=261184) --> (https://bugzilla.novell.com/attachment.cgi?id=261184) C# example to reproduce the bug Description of Problem: For C++ <-> C# structure compatibility, I wanted to force no alignment at all inside my data structures. Under some circumstances, the compiler fails to duplicate an instance of a packed structure. Packed with [StructLayout (LayoutKind.Sequential, Pack=1)]. The duplicated instance is corrupted for Pack=1, Pack=2 and Pack=4. Steps to reproduce the problem: 1. mcs BugPack.cs 2. mono BugPack.exe [StructLayout (LayoutKind.Sequential, Pack=1)] struct A { public IntPtr f1; public IntPtr f2; public IntPtr f3; public IntPtr f4; public int f5; }; The code - Initialize all field of an instance of struct A. - Displays the values of the fields ("Original f1...f5"). - Send this instance to a method "static void CheckA(A a)" - CheckA displays the values of the fields ("Duplicated f1..f5"). Actual Results: Original f1 = 1 Original f2 = 2 Original f3 = 3 Original f4 = 4 Original f5 = 5 Duplicated f1 = 1 Duplicated f2 = 2 Duplicated f3 = 3 Duplicated f4 = 4 Duplicated f5 = 7FFF <- !!! Not duplicated correctly !!! Expected Results: Original and duplicated to be identical. How often does this happen? Always. Additional Information: - Mono C# compiler version 1.2.6.0 - Linux immunity 2.6.24-19-generic #1 SMP Wed Aug 20 17:53:40 UTC 2008 x86_64 GNU/Linux -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are the QA contact for the bug. You are the assignee for the bug. _______________________________________________ mono-bugs maillist - [email protected] http://lists.ximian.com/mailman/listinfo/mono-bugs
