[Mono-bugs] [Bug 383993] New: invalid IL generated for comparison of enum with null

[bugzilla_noreply at novell.com]

https://bugzilla.novell.com/show_bug.cgi?id=383993


           Summary: invalid IL generated for comparison of enum with null
           Product: Mono: Compilers
           Version: unspecified
          Platform: Other
        OS/Version: Other
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: C#
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: mhabersack at novell.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---


Created an attachment (id=210621)
 --> (https://bugzilla.novell.com/attachment.cgi?id=210621)
enum_null_comparison_bad_il.diff

After applying the attached diff to the trunk corlib, the test case (svn)
gert/standalone/bug323430 fails with the following message: 

Unhandled Exception: System.InvalidProgramException: Invalid IL code in
System.IO.MonoIO:SetFileTime
(string,int,long,long,long,System.DateTime,System.IO.MonoIOError&): IL_0094:
ceq

The IL generated for the method is:

// method line 7783
    .method public static  hidebysig 
           default bool SetFileTime (string path, int32 'type', int64
creation_time, int64 last_access_time, int64 last_write_time, valuetype
System.DateTime dateTime, [out
] valuetype System.IO.MonoIOError& 'error')  cil managed 
    {
        // Method begins at RVA 0x6f71c
        // Code size 202 (0xca)
        .maxstack 24
        .locals init (
                native int      V_0,
                bool    V_1,
                valuetype System.IO.MonoIOError V_2,
                int32   V_3)
        IL_0000:  ldstr "MonoIO.SetFileTime (\"{0}\")"
        IL_0005:  ldarg.0 
        IL_0006:  call void class System.Console::WriteLine(string, object)
        IL_000b:  ldarg.0 
        IL_000c:  ldc.i4.3 
        IL_000d:  ldc.i4.3 
        IL_000e:  ldc.i4.3 
        IL_000f:  ldc.i4.0 
        IL_0010:  ldarg.s 6
        IL_0012:  call native int class System.IO.MonoIO::Open(string,
valuetype System.IO.FileMode, valuetype System.IO.FileAccess, valuetype
System.IO.FileShare, valuetype System.IO.FileOptions, [out] valuetype
System.IO.MonoIOError&)
        IL_0017:  stloc.0 
        IL_0018:  ldloc.0 
        IL_0019:  ldsfld native int System.IO.MonoIO::InvalidHandle
        IL_001e:  call bool native int::op_Equality(native int, native int)
        IL_0023:  brfalse IL_0034

        IL_0028:  ldstr "\topen failed"
        IL_002d:  call void class System.Console::WriteLine(string)
        IL_0032:  ldc.i4.0 
        IL_0033:  ret 
        IL_0034:  ldarg.1 
        IL_0035:  stloc.3 
        IL_0036:  ldloc.3 
        IL_0037:  ldc.i4.1 
        IL_0038:  sub 
        IL_0039:  switch (
          IL_004f,
          IL_005d,
          IL_006b)
        IL_004a:  br IL_0079

        IL_004f:  ldarga.s 5
        IL_0051:  call instance int64 valuetype System.DateTime::ToFileTime()
        IL_0056:  starg.s 2
        IL_0058:  br IL_0079

        IL_005d:  ldarga.s 5
        IL_005f:  call instance int64 valuetype System.DateTime::ToFileTime()
        IL_0064:  starg.s 3
        IL_0066:  br IL_0079

        IL_006b:  ldarga.s 5
        IL_006d:  call instance int64 valuetype System.DateTime::ToFileTime()
        IL_0072:  starg.s 4
        IL_0074:  br IL_0079

        IL_0079:  ldloc.0 
        IL_007a:  ldarg.2 
        IL_007b:  ldarg.3 
        IL_007c:  ldarg.s 4
        IL_007e:  ldarg.s 6
        IL_0080:  call bool class System.IO.MonoIO::SetFileTime(native int,
int64, int64, int64, [out] valuetype System.IO.MonoIOError&)
        IL_0085:  stloc.1 
        IL_0086:  ldstr "\tafter SetFileTime (error == {0})"
        IL_008b:  ldarg.s 6
        IL_008d:  ldind.i4 
        IL_008e:  ldarg.s 6
        IL_0090:  ldind.i4 
        IL_0091:  bne.un.s IL_0098

        IL_0093:  ldc.i4.0 
        IL_0094:  ceq 
        IL_0096:  br.s IL_0099

        IL_0098:  ldc.i4.1 
        IL_0099:  brfalse IL_00b5

        IL_009e:  ldarg.s 6
        IL_00a0:  ldind.i4 
        IL_00a1:  box System.IO.MonoIOError
        IL_00a6:  call instance class System.Type object::GetType()
        IL_00ab:  callvirt instance string class System.Type::ToString()
        IL_00b0:  br IL_00ba

        IL_00b5:  ldstr "[null]"
        IL_00ba:  call void class System.Console::WriteLine(string, object)
        IL_00bf:  ldloc.0 
        IL_00c0:  ldloca.s 2
        IL_00c2:  call bool class System.IO.MonoIO::Close(native int, [out]
valuetype System.IO.MonoIOError&)
        IL_00c7:  pop 
        IL_00c8:  ldloc.1 
        IL_00c9:  ret 
    } // end of method MonoIO::SetFileTime


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