[Mono-dev] JIT Patch Types

[Rodrigo Kumpera]

RGCTX fetch trampolines are used by the generics sharing machinery to
implement all sort of
things from vtable, field, static data and so on. If you have generic code,
you'll have them.

The worst part is that It's not possible to eagerly patch them due to
recursive types.



On Tue, Jun 7, 2011 at 1:01 PM, Martin Däumler <mdae at cs.tu-chemnitz.de>wrote:

> Hello,
>
> I have a further question about Mono internals. For a soft real-time
> project based on Mono I try to pre-patch all JIT-, jump-, class init-
> and delegate-trampolines (the latter at runtime). So I investigate
> the patches that are emitted in "mono_resolve_patch_target()".
>
> The underlying conditions are x86 architecture, Linux operating
> system, non-AOT case and the mcs C#-compiler. That is, my
> pre-patch only has to work with the C#-programs that can
> be compiled by the mcs. I dived into the code but is not
> always clear which patches are emitted under which circumstances.
> Now, I want to know if it is possible that the following patches
> are emitted by the JIT (non-AOT case):
>
> MONO_PATCH_INFO_RGCTX_FETCH (only needed if generics are used?)
> MONO_PATCH_INFO_JIT_ICALL_ADDR (not used on x86?)
> MONO_PATCH_INFO_ICALL_ADDR (only for AOT case?)
>
>
> I guess that the RGCTX (and practically the RGCTX lazy fetch
> trampoline) is used only if generics are used. So, a call to
> it is not emitted by the mcs, is it? For the other patches I
> assume that they are emitted only in AOT-case, but I am not
> sure.
>
>
> With kind regards,
> Martin Däumler
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>
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