Re: [rvm-research] Understanding the interaction of compiler with MMTk

On 13/06/13 11:14, Simran Nagra wrote:
> Hi
> We are working on our own research java compiler. We now have to
> interact with MMTk for garbage collection. We found the data
> structures used in Jikes RVM such as TIB  to be little abstract. Can
> you let me know of any good documentation available for these data
> structures?
Hi Simran,

The primary reference is the User Guide.  There is some sketchy
information on the TIB in [1], although the ultimate reference is in the
class org.jikesrvm.objectmodel.TIBLayoutConstants.  There is more
architecture level information in the key papers [2].

MMTk itself doesn't actually require information from the TIB - the
other reference VM is the MMTk Debugging Harness, and the Harness object
model doesn't have a TIB.

MMTk's JikesRVM interface accesses the TIB for one purpose: to access
the GC map of an object.  There's a description of how this works in our
scanning methods paper [3] (Figure 3) which is probably worth reading
before defining your VM <-> GC interface anyway. 

I'm the best person to ask re: the MMTk <-> VM interface, so feel free
to bounce queries off me.

cheers
Robin

[1] http://jikesrvm.org/Object+Model
[2] http://jikesrvm.org/Recommended+Reading
[3] http://cs.anu.edu.au/~Robin.Garner/scan-ismm-2011.pdf

> Thanks in advance
>
>
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