Re: [PATCH] bulk: Rename TARGET_FMT_plx -> HWADDR_FMT_plx

[Peter Maydell]

On Tue, 10 Jan 2023 at 22:04, BALATON Zoltan <balaton@eik.bme.hu> wrote:
>
> On Tue, 10 Jan 2023, Philippe Mathieu-Daudé wrote:
> > The 'hwaddr' type is defined in "exec/hwaddr.h" as:
> >
> >    hwaddr is the type of a physical address
> >   (its size can be different from 'target_ulong').
> >
> > All definitions use the 'HWADDR_' prefix, except TARGET_FMT_plx:
> >
> > $ fgrep define include/exec/hwaddr.h
> > #define HWADDR_H
> > #define HWADDR_BITS 64
> > #define HWADDR_MAX UINT64_MAX
> > #define TARGET_FMT_plx "%016" PRIx64
> >         ^^^^^^
> > #define HWADDR_PRId PRId64
> > #define HWADDR_PRIi PRIi64
> > #define HWADDR_PRIo PRIo64
> > #define HWADDR_PRIu PRIu64
> > #define HWADDR_PRIx PRIx64
>
> Why are there both TARGET_FMT_plx and HWADDR_PRIx? Why not just use
> HWADDR_PRIx instead?

TARGET_FMT_plx is part of a family of defines for printing
target_foo types; the rest are in cpu-defs.h. These all include the
'%' character. This is more convenient to use, but it's also
out-of-line with the C standard format macros like PRIx64.
The HWADDR_* macros take the approach of aligning with how you
use the C standard format macros.

As usual in QEMU, where there are two different ways of doing
things, it's probably because one of them is a lot older than
the other and written by a different person. In theory it would
be nice to apply some consistency here but it rarely seems
worth the effort of the bulk code edit.

thanks
-- PMM