Re: [rvm-research] Recompilation of Method

On 5/12/2015 7:32 AM, Abhinav Jangda wrote:
> Hello Everyone,
>
> I am doing a research project over JikesRVM. For this I need to recompile a method whenever it is
> called again. As JikesRVM has a JIT, so I think there must be some place where JikesRVM is getting
> the compiled code of  method from its cache and calling it. Can anyone please tell me where this
> thing is happening?
> Moreover, I am working with BaselineCompiler not with OptCompiler.

The "cache" is not probed on each method call.  Rather, a virtual dispatch is done (for instance
methods) or the address of a static method is obtained, and the method is called.  I don't recall
whether the Baseline compiler hard codes calls to static methods or not.  For methods that are
not yet loaded / compiled, the compiler puts in a call to as stub that forces the necessary loading
and compiling actions and then redirects to the compiled method, fixing up so that future calls
do not need to go through the stub.  So, in effect, there is not really a cache in the sense I
take from you email.  However, it is easy to replace the addresses of methods in JikesRVM's
equivalent of vtables ...

Regards -- Eliot Moss

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