dtrace discuss - Sep 2009 - Making generated code pid-compatible

Hi, I''ve got a VM that reads in a compiled bytecode file, generates
native code, and executes it.  The format derives from a C-like
language.

What sort of data should I provide, and how do I make it visible to
the pid provider to make it possible to dtrace it?

Thanks,
-Lally

Hey Lally,
> Hi, I''ve got a VM that reads in a compiled bytecode file,
generates
> native code, and executes it.  The format derives from a C-like
> language.
> 
> What sort of data should I provide, and how do I make it visible to
> the pid provider to make it possible to dtrace it?
The pid provider merely scans the symbol table to detect symbols so that
would suffice, but I''d guess that that isn''t an option for
you.

Alternatively you could piggyback on the USDT mechanism or write your own
new provider. Both of these would be fairly complex, but certainly not
impossible.

Does your VM have a cache of compiled code or once compiled is the native
code fairly static?

Adam

-- 
Adam Leventhal, Fishworks                     http://blogs.sun.com/ahl