Re: [Jikesrvm-researchers] Study on VM_Magic.threadSwitch() and compiler

[yau m. <mei...@ya...>]

hi,

I have come across the file OPT_GenerateMagic which
inlines appropriate code for the VM_Magic.threadSwitch
method. I can hardly make a trace to instrument thread
switches during run time from this file and I don't
think so am in the correct way.

As what you have suggested to emit a few instructions
in the compiler, am having a difficulty in identifying
the correct file and where can I instrument thread
switches which is called from the dispatch on every
VM_Magic.threadSwitch

It would be helpful if anyone can help to assist me
further in this.

Thank you

Meileng
Master Student
FIT
Multimedia University
Malaysia 

--- Eliot Moss <mo...@cs...> wrote:

> Meiling -- Essentially ALL VM_Magic routines are
> "hijacked" by the
> compiler. That's how magics work. They are not
> directly expressible in
> Java, following the rules. Both baseline and
> optimizing compilers, when
> they see any given magic, generate specialized code
> for it. If you want to
> instrument thread switches, you _might_ want/need to
> change the compilers
> to emit extra instructions in the sequence, etc.,
> but of course this
> requires care :-). In any case, you might want to
> investigate to see what
> the sequence _is_.
> 
> Hope this helps .....  Eliot
>
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