Re: [rvm-research] Implementing my custom instrumentation

On 01/07/18 11:10, Khaled Z Mahmoud wrote:

> Hi,
>
> I have been looking at the opt package. The API has an IR class that 
> represents a compiled method.
> This class enables iterating through all instructions of the method 
> and also enables inserting new instructions as well. I can for example 
> insert a method call.
>
> The questions are :
>
>   * I want to perform instrumentation on call classes and methods, at
>     the baseline compiler. Can I still access the same API ?
>
No.  The compilers are different codebases.  The baseline compiler 
translates bytecode directly into machine instructions, and has no IR as 
such.
>
>   * My instrumentation logic will also depend if the current
>     instruction is a yieldpoint. So, yieldpoint instrumentation should
>     be already done.
>
> Any ideas or suggestions on that ?
If your instrumentation is amenable, you could try inserting it into the 
bytecode.  There are libraries (i've used asm in the past) that make it 
pretty easy to do this kind of bytecode rewriting.  Once the bytecode is 
instrumented, both compilers will generate code for it.

cheers,
Robin
>
>
>
> -- 
> Regards,
> Khaled Mahmoud
>
>
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