[pypy-dev] Next step: gen???.py
arigo at tunes.org
Thu Mar 31 10:29:29 CEST 2005
On Wed, Mar 30, 2005 at 07:48:43PM +0200, holger krekel wrote:
> (... C++ ...)
> Wouldn't this mean that we are barred from using "tcc" for
> testing/debugging purposes?
That's an excellent point.
I played with a more promizing approach in
http://codespeak.net/svn/pypy/dist/pypy/translator/typer.py . Basically,
instead of enhancing genc to support all kind of typed operations and implicit
conversions (or rely on C++ to select the operations and insert these
conversions automatically), the abvoe module contains code that modifies the
flow graph itself to turn it into a "low-level" flow graph. The idea was
already floating around here. In short it turns code like
z = add(x, y)
z = intadd(x, y)
if x and y are SomeIntegers, and it inserts int2obj() and obj2int() operations
to convert variables that are SomeIntegers but used in operations that can't
be special-cased (most of them, right now).
The idea is then that genc only needs minor updates to give various C types to
the variables. The operations like intadd() can be defined as a macro in
genc.h, just like all the other operations.
The module is called "typer" because I guess that a clean solution would
involve a dict that maps Variables and individual Constants to their C type,
instead of relying implicitely on the SomeXxx annotations to mean particular C
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