Hi
On Mon, Jun 14, 2021 at 4:48 PM Markus Armbruster <arm...@redhat.com> wrote:
> marcandre.lur...@redhat.com writes:
>
> > From: Marc-André Lureau <marcandre.lur...@redhat.com>
> >
> > Instead of building prepocessor conditions from a list of string, use
> > the result generated from QAPISchemaIfCond.cgen().
>
> I understand why you're doing this, but only because I know where you're
> headed. By itself, it is not an improvement: you move C generation out
> of common.py into schema.py. You need to explain why that's useful.
>
>
What about?
In the following commits, QAPISchemaIfCond is going to hold an internal
tree structure. Moving cgen() there allows to abstract away the condition
representation.
> > diff --git a/scripts/qapi/schema.py b/scripts/qapi/schema.py
> > index bc357ebbfa..aa4715c519 100644
> > --- a/scripts/qapi/schema.py
> > +++ b/scripts/qapi/schema.py
> > @@ -29,6 +29,9 @@ class QAPISchemaIfCond:
> > def __init__(self, ifcond=None):
> > self.ifcond = ifcond or []
> >
> > + def cgen(self):
> > + return ' && '.join(self.ifcond)
>
> Fragile. Better:
>
> return '(' + ') && ('.join(self.ifcond) + ')'
>
>
This is an intermediary step, but ok.
If we want to keep C generation details out of schema.py, we need a
> helper mapping self.ifcond: Sequence[str] to C code, similar to how
> QAPISchemaEntity.c_name() works with helper c_name().
>
Leaving a FIXME.
> > +
> > # Returns true if the condition is not void
> > def __bool__(self):
> > return bool(self.ifcond)
> > diff --git a/scripts/qapi/types.py b/scripts/qapi/types.py
> > index 3673cf0f49..db9ff95bd1 100644
> > --- a/scripts/qapi/types.py
> > +++ b/scripts/qapi/types.py
> > @@ -51,13 +51,13 @@ def gen_enum_lookup(name: str,
> > ''',
> > c_name=c_name(name))
> > for memb in members:
> > - ret += gen_if(memb.ifcond.ifcond)
> > + ret += gen_if(memb.ifcond.cgen())
> > index = c_enum_const(name, memb.name, prefix)
> > ret += mcgen('''
> > [%(index)s] = "%(name)s",
> > ''',
> > index=index, name=memb.name)
> > - ret += gen_endif(memb.ifcond.ifcond)
> > + ret += gen_endif(memb.ifcond.cgen())
> >
> > ret += mcgen('''
> > },
> [More of the same snipped...]
>
>
>
--
Marc-André Lureau
