I'm writing a compiler that outputs .NET assemblies (using Mono.Cecil, although I don't believe Cecil is relevant to this problem). One of the compiler features requires that a class will have a compiler-generated nested class with some support methods; the outer class has a static field so each class effectively has a singleton referencing an object of the nested class. To initialise this, any such class has a class constructor to create an instance of the nested class and store it in the field.
Problem: When my outer class is a generic class, I make the nested class generic too (since it needs to create objects of the outer class). The generated IL passes through peverify fine, and looks fine to my eye, but the class constructor creating an instance of the nested class throws OutOfMemoryException at runtime.
I've disassembled the assembly with ildasm, slimmed it down to a minimal reproduction (unfortunately still ~180 lines of IL), and verifying that compiling the IL with ilasm produces an exe that still exhibits the problem.
Debugging with Visual Studio or MDbg hasn't enlightened me - I just get OutOfMemoryException without indication why. I'm willing to believe my IL is invalid somehow, but peverify doesn't indicate a problem. Can anyone suggest what the issue is?
// Metadata version: v4.0.30319
.assembly extern mscorlib
{
.publickeytoken = (B7 7A 5C 56 19 34 E0 89 ) // .z\V.4..
.ver 4:0:0:0
}
.assembly extern System
{
.publickeytoken = (B7 7A 5C 56 19 34 E0 89 ) // .z\V.4..
.ver 4:0:0:0
}
.assembly Repro1
{
.ver 0:0:0:0
}
.module Repro1
// MVID: {7DA983B6-F5EA-4ACB-8443-C29F25ADDCD4}
.imagebase 0x00400000
.file alignment 0x00000200
.stackreserve 0x00100000
.subsystem 0x0003 // WINDOWS_CUI
.corflags 0x00000001 // ILONLY
// Image base: 0x016E0000
.class public abstract auto ansi sealed Repro1
extends [mscorlib]System.Object
{
.method assembly static void '<NemeaProgram>'() cil managed
{
.entrypoint
// Code size 6 (0x6)
.maxstack 0
IL_0000: call void Rep2::Go()
IL_0005: ret
} // end of method Repro1::'<NemeaProgram>'
} // end of class Repro1
.class public abstract auto ansi sealed Rep1
extends [mscorlib]System.Object
{
.class auto ansi nested public TRep
extends [mscorlib]System.Object
{
.class auto ansi nested public '__%NemeaVType'
extends [mscorlib]System.Object
{
.method public hidebysig specialname rtspecialname
instance void .ctor() cil managed
{
// Code size 7 (0x7)
.maxstack 8
IL_0000: ldarg.0
IL_0001: call instance void [mscorlib]System.Object::.ctor()
IL_0006: ret
} // end of method '__%NemeaVType'::.ctor
.method public newslot virtual instance class Rep1/TRep
Create(string Foo) cil managed
{
// Code size 10 (0xa)
.maxstack 8
IL_0000: ldarg Foo
IL_0004: newobj instance void Rep1/TRep::.ctor(string)
IL_0009: ret
} // end of method '__%NemeaVType'::Create
} // end of class '__%NemeaVType'
.field famorassem string FData
.field public static class Rep1/TRep/'__%NemeaVType' '__%NemeaVTypeI'
.method public hidebysig specialname rtspecialname
instance void .ctor(string Foo) cil managed
{
// Code size 17 (0x11)
.maxstack 8
IL_0000: ldarg.0
IL_0001: call instance void [mscorlib]System.Object::.ctor()
IL_0006: ldarg.0
IL_0007: ldarg Foo
IL_000b: stfld string Rep1/TRep::FData
IL_0010: ret
} // end of method TRep::.ctor
.method privatescope specialname rtspecialname static
void '.cctor$PST0600004C'() cil managed
{
// Code size 11 (0xb)
.maxstack 8
IL_0000: newobj instance void Rep1/TRep/'__%NemeaVType'::.ctor()
IL_0005: stsfld class Rep1/TRep/'__%NemeaVType' Rep1/TRep::'__%NemeaVTypeI'
IL_000a: ret
} // end of method TRep::.cctor
} // end of class TRep
.class auto ansi nested public TItem
extends [mscorlib]System.Object
{
.method public hidebysig specialname rtspecialname
instance void .ctor() cil managed
{
// Code size 7 (0x7)
.maxstack 8
IL_0000: ldarg.0
IL_0001: call instance void [mscorlib]System.Object::.ctor()
IL_0006: ret
} // end of method TItem::.ctor
} // end of class TItem
} // end of class Rep1
.class public abstract auto ansi sealed Rep2
extends [mscorlib]System.Object
{
.class auto ansi nested public TRep<(Rep1/TItem) T>
extends Rep1/TRep
{
.class auto ansi nested public '__%NemeaVType'<(Rep1/TItem) T_vt>
extends Rep1/TRep/'__%NemeaVType'
{
.method public hidebysig specialname rtspecialname
instance void .ctor() cil managed
{
// Code size 7 (0x7)
.maxstack 8
IL_0000: ldarg.0
IL_0001: call instance void Rep1/TRep/'__%NemeaVType'::.ctor()
IL_0006: ret
} // end of method '__%NemeaVType'::.ctor
.method public virtual instance class Rep1/TRep
Create(string Foo) cil managed
{
// Code size 10 (0xa)
.maxstack 8
IL_0000: ldarg Foo
IL_0004: newobj instance void class Rep2/TRep<!T_vt>::.ctor(string)
IL_0009: ret
} // end of method '__%NemeaVType'::Create
} // end of class '__%NemeaVType'
.field public static class Rep2/TRep/'__%NemeaVType'<!T> '__%NemeaVTypeI'
.method public hidebysig specialname rtspecialname
instance void .ctor(string Foo) cil managed
{
// Code size 22 (0x16)
.maxstack 8
IL_0000: ldarg.0
IL_0001: ldarg Foo
IL_0005: call instance void Rep1/TRep::.ctor(string)
IL_0015: ret
} // end of method TRep::.ctor
.method privatescope specialname rtspecialname static
void '.cctor$PST06000055'() cil managed
{
// Code size 11 (0xb)
.maxstack 8
IL_0000: newobj instance void class Rep2/TRep/'__%NemeaVType'<!T>::.ctor()
IL_0005: stsfld class Rep2/TRep/'__%NemeaVType'<!T> Rep2/TRep::'__%NemeaVTypeI'
IL_000a: ret
} // end of method TRep::.cctor
} // end of class TRep
.method public static void Go() cil managed
{
// Code size 29 (0x1d)
.maxstack 1
.locals init ([0] class Rep1/TRep R)
IL_0000: ldstr "Oi"
IL_0005: newobj instance void class Rep2/TRep<class Rep1/TItem>::.ctor(string)
IL_000a: stloc R
IL_001c: ret
} // end of method Rep2::Go
} // end of class Rep2