Sorry for being unclear. I am working in the context of adaptive
optimization. Maybe I would use a small example:
Method mthA {
// Call some method B here
}
What I want to do is have the JIT patch the code of mthA as it is compiling
it such that it becomes:
Method mthA {
if (condition) {
// Call some method C
}
else {
// Call some method B here
}
}
Now there are some requirement:
1. "condition" is a reference to internal data of the runtime, e.g. the
execution count of a method, or some info that is collected from the
profiler.
2. The condition check is done as "mthA" is actually executing.
Basically, the runtime passed a reference of some data, to a piece of user
code. And the user code checked that data for some condition.
I can certainly do the patching in "mono_method_to_ir()". But the problem is
how I can enable such condition check from user code to internal data
structure of the runtime. And do it quickly.
Thanks.
Derek
> Hello,
>
> > I am experimenting with some ideas using mono. I hope this is not
> > off-topic.
> >
> > I want to modify the JIT of mono to insert some code to
> > methods when they are being JIT -ted. Specifically, I need to insert a
> > check to some internal variables declared in the mono runtime (e.g.
> > an int, a single bit, etc). The problem is that these are "unmanaged"
stuff
> > existing in the runtime's address space. And I must insert the check
> > to User's code that are "managed".
> >
> > I need a way to insert this check crossing the "managed" /
> > "unmanaged" boundary. I know the "Marshal" class would do that for me.
> > But I am guess it might be too slow. Are there other ways to do it?
Maybe the
> > only better way is to patch up the native code after the code gen
process?
> > Any insight is appreciated. Thanks.
>
> You should describe in more detail what you are after. There
> is a pluggable profiling interface that you might want to
> look into (code coverage and profiling are implemented this way).
>
> For more technical stuff, you might want to patch directly
> the code generation engine.
>
> Miguel.
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