Package: mono-mcs
Version: 3.0.6+dfsg2-4
Severity: normal
File: /usr/bin/mcs
Dear Maintainer,
It seems mcs generates IL that simply does not make sense (and differs
to what Visual Studio generates) for the following source code:
using System;
namespace PHP
{
public struct FullPath
{
private string path;
public FullPath(string arbitraryPath)
{
this.path = arbitraryPath;
}
public static implicit operator string(FullPath fullPath)
{
return fullPath.path;
}
}
class FullPathTest
{
public static void Main (string[] args)
{
FullPath fp = new FullPath ("/etc/passwd");
Console.WriteLine ("Comparing with == : " +
(fp == null ? "true" : "false") + "; expected: false");
Console.WriteLine ("Comparing with != : " +(fp
!= null ? "true" : "false") + "; expected: true");
Console.WriteLine ();
}
}
}
Here's a snippet of monodis output for assembly generated with mono
compiler:
IL_000c: ldstr "Comparing with == : "
IL_0011: ldloc.0
IL_0012: call string valuetype
PHP.FullPath::op_Implicit(valuetype PHP.FullPath)
IL_0017: ldloc.0 // should be ldnull (!)
IL_0018: call string valuetype
PHP.FullPath::op_Implicit(valuetype PHP.FullPath) // this line should
not be present at all
IL_001d: call bool string::op_Equality(string, string)
IL_0022: brfalse IL_0031
IL_0027: ldstr "true"
IL_002c: br IL_0036
IL_0031: ldstr "false"
IL_0036: ldstr "; expected: false"
IL_003b: call string string::Concat(string, string, string)
IL_0040: call void class [mscorlib]System.Console::WriteLine(string)
Here's what Visual Studio 2012 Express generates:
IL_000e: ldstr "Comparing with == : "
IL_0013: ldloc.0
IL_0014: call string valuetype
PHP.FullPath::op_Implicit(valuetype PHP.FullPath)
IL_0019: ldnull
IL_001a: call bool string::op_Equality(string, string)
IL_001f: brtrue.s IL_0028
IL_0021: ldstr "false"
IL_0026: br.s IL_002d
IL_0028: ldstr "true"
IL_002d: nop
IL_002e: ldstr "; expected: false"
IL_0033: call string string::Concat(string, string, string)
IL_0038: call void class [mscorlib]System.Console::WriteLine(string)
As a result of this, program compiled with mono csharp compiler produces
totally unexpected results.
-- System Information:
Debian Release: jessie/sid
APT prefers unstable
APT policy: (500, 'unstable')
Architecture: i386 (i686)
Kernel: Linux 3.8-2-686-pae (SMP w/1 CPU core)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Versions of packages mono-mcs depends on:
ii libc6 2.17-3
ii libmono-corlib4.5-cil 3.0.6+dfsg2-4
ii libmono-microsoft-csharp4.0-cil 3.0.6+dfsg2-4
ii libmono-system-core4.0-cil 3.0.6+dfsg2-4
ii libmono-system-xml4.0-cil 3.0.6+dfsg2-4
ii libmono-system4.0-cil 3.0.6+dfsg2-4
ii mono-runtime 3.0.6+dfsg2-4
Versions of packages mono-mcs recommends:
ii pkg-config 0.26-1
mono-mcs suggests no packages.
-- no debconf information
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