https://bugzilla.novell.com/show_bug.cgi?id=389073
Summary: Bad IntPtr typecast
Product: Mono: Compilers
Version: SVN
Platform: Other
OS/Version: Other
Status: NEW
Severity: Normal
Priority: P5 - None
Component: C#
AssignedTo: mono-bugs@lists.ximian.com
ReportedBy: [EMAIL PROTECTED]
QAContact: mono-bugs@lists.ximian.com
Found By: ---
gmcs compile this code
private long CastUIntPtrToInt64 (UIntPtr ptr)
{
return (long) ptr;
}
into this
IL_0000: ldarg.1
IL_0001: call System.UInt32 System.UIntPtr::op_Explicit(System.UIntPtr)
IL_0006: conv.u8
IL_0007: ret
Converting to U8 (why not I8 ?) won't give back the 32bits lost, which is a
problem on all 64bits platforms.
MS csc generates this
L_0000: ldarg.1
L_0001: call uint64 [mscorlib]System.UIntPtr::op_Explicit(native
unsigned int)
L_0006: ret
Another case (not as bad) is:
System.UInt32 CastIntPtrToUInt32(System.IntPtr)
mcs:
IL_0000: ldarg.1
IL_0001: call System.Int64 System.IntPtr::op_Explicit(System.IntPtr)
IL_0006: conv.u4
IL_0007: ret
csc
L_0000: ldarg.1
L_0001: call int32 [mscorlib]System.IntPtr::op_Explicit(native int)
L_0006: ret
There could be other cases too... they just did not trigger my new rule :-)
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