https://bugzilla.novell.com/show_bug.cgi?id=412965
Summary: MethodBuilder.SetReturnType (null) may cause NRE
Product: Mono: Class Libraries
Version: SVN
Platform: Other
OS/Version: Other
Status: NEW
Severity: Minor
Priority: P5 - None
Component: CORLIB
AssignedTo: [email protected]
ReportedBy: [EMAIL PROTECTED]
QAContact: [email protected]
Found By: ---
Repro:
using System;
using System.Collections.Generic;
using System.Reflection;
using System.Reflection.Emit;
using System.Text;
class vbnc_bugs {
static void Main (string [] args) {
AppDomain domain = AppDomain.CurrentDomain;
AssemblyName name = new AssemblyName ("test");
AssemblyBuilder assembly = domain.DefineDynamicAssembly (name,
AssemblyBuilderAccess.RunAndSave | (AssemblyBuilderAccess) 0x800);
ModuleBuilder module = assembly.DefineDynamicModule ("module");
TypeBuilder TBase = module.DefineType ("TBase`1", TypeAttributes.Public, typeof
(List <>));
GenericTypeParameterBuilder [] TBaseParams = TBase.DefineGenericParameters (new
string [] {"T"});
TypeBuilder TList = module.DefineType ("TList`1", TypeAttributes.Public,
TBase);
TypeBuilder A = module.DefineType ("A", TypeAttributes.Public);
GenericTypeParameterBuilder [] TListParams = TList.DefineGenericParameters (new
string [] {"T"});
Type TListInst = TList.MakeGenericType (new Type [] {A});
MethodBuilder method = TList.DefineMethod ("Add", MethodAttributes.Public,
null, Type.EmptyTypes);
method.SetReturnType (null); // This is the problem
MethodInfo methodInst = TypeBuilder.GetMethod (TListInst, method);
Console.WriteLine (methodInst.GetType ().FullName);
Console.WriteLine (methodInst.DeclaringType.FullName);
Console.WriteLine (methodInst.ReturnType);
Console.WriteLine (method.ReturnType);
method.GetILGenerator ().EmitCall (OpCodes.Call, methodInst, null);
Console.WriteLine ("SUCCESS");
}
}
Expected output:
(...)
SUCCESS
Actual output:
Unhandled Exception: System.NullReferenceException: Object reference not set to
an instance of an object
at System.Reflection.MonoGenericClass.InflateType (System.Type type)
[0x00000] in
/mono/main/src/mcs/class/corlib/System.Reflection/MonoGenericClass.cs:123
at System.Reflection.Emit.MethodOnTypeBuilderInst.get_ReturnType () [0x0002b]
in
/mono/main/src/mcs/class/corlib/System.Reflection.Emit/MethodOnTypeBuilderInst.cs:80
at vbnc_bugs.Main (System.String[] args) [0x000ec] in
/home/rolf/test/reflection.cs:29
make: *** [reflection] Error 1
2
Note:
This only happen in Compiler mode (adding the 0x800 flag for
AssemblyBuilderAccess when creating the assembly). I've worked around this in
vbnc (using SetReturnType (System.Void) instead of null), so it's not a big
issue anymore (at least for me).
[EMAIL PROTECTED]:~/test> mono --version
Mono JIT compiler version 2.0 (/trunk/mono r109155)
Copyright (C) 2002-2008 Novell, Inc and Contributors. www.mono-project.com
TLS: __thread
GC: Included Boehm (with typed GC)
SIGSEGV: altstack
Notifications: epoll
Architecture: x86
Disabled: none
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