Hi Andreas,
One thing I found out is that when using
Marshal.GetDelegateForFunctionPointer, you need to keep a (managed)
reference to the delegate used to construct the function pointer around
as well. Otherwise the GC may clean up the delegate and the function
pointer will become invalid - although I did get a message informing me
that the handle had been cleaned instead of an immediate crash.
--
Ivo
Op 21-1-2017 om 13:46 schreef pardeike:
Hi,
I am trying to replace methods during runtime. Lots of existing ways do this
by
simply inserting a jump at assembler level from the original to the new
method.
I want to do this too but with the new method being a DynamicMethod (or a
delegate to it).
I did solve the IL part of it but testing it with a game (RimWorld) that
uses Unity
I find it crashes when I try my code with more than one method. I am no
expert
in when mono jitts its methods and vaguely know about trampolines and it
looks
like the memory area that you get with GetFunctionPtr() does change compared
to when I write a jump to it into the original and that changed assembler
gives
me all sort of crashes. Interestingly, the other method using exactly the
same way
to patch it works.
So any pointers, ideas or suggestions welcome. I am in general an
experienced
developer but just not familiar with the specific area. I can read c# and c
and
tried to understand the mono repository code and will continue to do so. I
though
it would be nice to ask in parallel here.
Thanks,
Andreas
PS: my (not complete project) is here: https://github.com/pardeike/Harmony
--
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