[Mono-bugs] [Bug 617161] New: NRE in dynamic method with nullable types

bugzilla_noreply at novell.com bugzilla_noreply at novell.com
Thu Jun 24 12:38:47 EDT 2010



           Summary: NRE in dynamic method with nullable types
    Classification: Mono
           Product: Mono: Runtime
           Version: SVN
          Platform: Other
        OS/Version: Other
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: JIT
        AssignedTo: lupus at novell.com
        ReportedBy: jbevain at novell.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---
           Blocker: ---

The following test case have to be compiled with dmcs, as the bug is triggered
by what the DLR emits. 

The SRE code in the test case is only to show what the DLR emits. Apparently
it's the same IL that is emitted in the assembly, and in the dynamic method.

When calling the code from the emitted assembly it works just fine, but the
compiled dynamic method throws an NRE.

Test case:

using System;
using System.Linq;
using System.Linq.Expressions;
using System.Reflection;
using System.Reflection.Emit;

public class Test {

    public static void Main ()
        var assembly = AppDomain.CurrentDomain.DefineDynamicAssembly (new
AssemblyName ("repro"), AssemblyBuilderAccess.RunAndSave);
        var module = assembly.DefineDynamicModule ("repro.dll");
        var type = module.DefineType ("Test", TypeAttributes.Public);
        var method = type.DefineMethod ("Method", MethodAttributes.Public |
MethodAttributes.Static, typeof (Func<long?>), new Type[] {typeof (long?)});

        var p = Expression.Parameter(typeof(long?), "p");

        Expression<Func<Func<long?, long?>>> e4 =
Expression.Lambda<Func<Func<long?, long?>>>(
            Expression.Lambda<Func<long?, long?>>(
                    new ParameterExpression[] { p }),

        e4.CompileToMethod (method);
        type.CreateType ();
        assembly.Save ("repro.dll");

        Func<Func<long?, long?>> f4 = e4.Compile ();

        Console.WriteLine (object.Equals (f4 () (0), (long?) ~0));

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