Hi John, As an aside, if you strictly need more information in your descrs, nobody stops you from using less of llsupport and instead writing or at least overriding your own descr infrastructure. I would imagine that a number of things from llsupport are not a perfect match for the mu backend.
Cheers, Carl Friedrich On March 15, 2017 8:13:06 AM GMT+01:00, Armin Rigo <armin.r...@gmail.com> wrote: >Hi, > >On 15 March 2017 at 04:40, William ML Leslie ><william.leslie....@gmail.com> wrote: >> The RTTI are a hook that the backend can implement, there is a fair >> bit of flexibility in what values they can take. > >That's right, but also, the RTTI is actually something from the early >days of PyPy and not used any more nowadays. It is used with our >test-only refcounting GC but not by "real code". I wouldn't start >with that. > >>> It seems that by default the JIT transformer throws away the actual >type information >>> (GcStruct etc., which is not representable under RPython, I know) >and only keeps >>> the size. However, in Mu, memory allocation requires specific type >information. > >That's not really true. We need to keep at least the typeid (a >number, also called "tid") in addition to the size. This is stored in >the SizeDescr, for GcStructs, which is a small piece of type >information built at translation time by cpu.sizeof(). Look for >get_size_descr() in jit/backend/llsupport/, and for init_size_descr() >in jit/backend/llsupport/gc.py. You can tweak SizeDescr to attach >whatever info is needed there. > >As William said, depending on what exactly you need, you need to also >tweak jit/codewriter/, which is the code that ultimately invokes the >translation-time setting up of SizeDescr. > >Also, the same applies to the other Descr classes in >llsupport/descr.py, at least ArrayDescr. > > >A bientôt, > >Armin. >_______________________________________________ >pypy-dev mailing list >pypy-dev@python.org >https://mail.python.org/mailman/listinfo/pypy-dev
_______________________________________________ pypy-dev mailing list pypy-dev@python.org https://mail.python.org/mailman/listinfo/pypy-dev
