Re: [rvm-research] Adding Runtime Extension

On 6/30/2014 12:13 PM, Matthew Ma wrote:
> Hi Elliot,
> Thanks for the reply.
> Could you be a little specific on what you mean by “With Jikes RVM you CAN add header fields”?
> With the help and suggestion from Rifat, I now can add a Word in MiscHeader (changed header size, misc offset..).
> The difficulty I have is how to process annotations annotated on method, and retrieve it to write into any object created in that method.

So, yes, you can add data in a miscellaneous header, but
bytecode cannot directly access it since it is not a "field"
in the Java sense.  To access it from bytecode you will need
to add some "native" (or "magic") routines, or perhaps call
existing "magic" routines, from bytecode to access the header
field for you.  (Native method go through JNI like other JVMs;
"magic" methods are recognized by all the bytecode compilers
in Jikes RVM and the compiler generates code for them directly.)

Does this make sense?

Best -- E

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