[Mono-dev] Having trouble getting tail. callvirt to work

[Zoltan Varga]

Hi,

  Mono's tail call implementation has some limitations, so it is simply
turned off in some cases like this one.

                         Zoltan

On Sun, Nov 14, 2010 at 9:31 AM, Stefan O'Rear <stefanor at cox.net> wrote:

> The following small CIL demo blows the stack on Mono 2.9/78b8d38 with
> both the LLVM and integrated JIT backends.  What am I doing wrong?
>
> If callvirt is replaced with call, the program runs in constant stack
> space.  If callvirt is replaced with calli (passing in the ldftn value
> as a parameter), the program fails exactly as it does for callvirt.
>
> -Stefan
>
> .assembly extern mscorlib {}
>
> .assembly 'test' { }
>
> .class public auto C
> {
>    .method public hidebysig specialname rtspecialname
>           instance default void '.ctor' ()  cil managed
>    {
>        .maxstack 8
>        ldarg.0
>        call instance void class [mscorlib]System.Object::'.ctor'()
>        ret
>    }
>
>    .method public virtual instance void Fun()
>    {
>        ldarg.0
>        tail.
>        callvirt instance void class C::Fun()
>        ret
>    }
> }
>
> .method static public void main() cil managed
> {
>    .entrypoint
>    .maxstack 1
>    newobj instance void class C::'.ctor'()
>    callvirt instance void class C::Fun()
>    ret
> }
>
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