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* [gcc r14-8976] pretty-print: Fix up ptrdiff handling for %tu, %to, %tx
@ 2024-02-14 13:37 Jakub Jelinek
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From: Jakub Jelinek @ 2024-02-14 13:37 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:e8971ef99505161d09c9bf0174b38fa15fc6e59f
commit r14-8976-ge8971ef99505161d09c9bf0174b38fa15fc6e59f
Author: Jakub Jelinek <jakub@redhat.com>
Date: Wed Feb 14 14:35:32 2024 +0100
pretty-print: Fix up ptrdiff handling for %tu, %to, %tx
This is IMHO more of a theoretical case, I believe my current code
doesn't handle %tu or %to or %tx correctly if ptrdiff_t is not one of
int, long int or long long int. For size_t and %zd or %zi I'm
using va_arg (whatever, ssize_t) and hope that ssize_t is the signed
type corresponding to size_t which C99 talks about.
For ptrdiff_t there is no type for unsigned type corresponding to
ptrdiff_t and I'm not aware of a portable way on the host to get
such a type (the fmt tests use hacks like
#define signed /* Type might or might not have explicit 'signed'. */
typedef unsigned __PTRDIFF_TYPE__ unsigned_ptrdiff_t;
#undef signed
but that only works with compilers which predefine __PTRDIFF_TYPE__),
std::make_unsigned<ptrdiff_t> I believe only works reliably if
ptrdiff_t is one of char, signed char, short, int, long or long long,
but won't work e.g. for __int20__ or whatever other weird ptrdiff_t
the host might have.
The following patch assumes host is two's complement (I think we
rely on it pretty much everywhere anyway) and prints unsigned type
corresponding to ptrdiff_t as unsigned long long printing of
ptrdiff_t value masked with 2ULL * PTRDIFF_MAX + 1. So the only
actual limitation is that it doesn't support ptrdiff_t wider than
long long int.
2024-02-14 Jakub Jelinek <jakub@redhat.com>
* pretty-print.cc (PTRDIFF_MAX): Define if not yet defined.
(pp_integer_with_precision): For unsigned ptrdiff_t printing
with u, o or x print ptrdiff_t argument converted to
unsigned long long and masked with 2ULL * PTRDIFF_MAX + 1.
* error.cc (error_print): For u printing of ptrdiff_t,
print ptrdiff_t argument converted to unsigned long long and
masked with 2ULL * PTRDIFF_MAX + 1.
Diff:
---
gcc/fortran/error.cc | 15 ++++++++-------
gcc/pretty-print.cc | 13 ++++++++++++-
2 files changed, 20 insertions(+), 8 deletions(-)
diff --git a/gcc/fortran/error.cc b/gcc/fortran/error.cc
index c346552235b3..65e38b0e8667 100644
--- a/gcc/fortran/error.cc
+++ b/gcc/fortran/error.cc
@@ -886,13 +886,14 @@ error_print (const char *type, const char *format0, va_list argp)
format++;
if (*format == 'u')
{
- ptrdiff_t ptrdiffval = spec[n++].u.ptrdiffval;
- if (sizeof (ptrdiff_t) == sizeof (int))
- error_uinteger ((unsigned) ptrdiffval);
- else if (sizeof (ptrdiff_t) == sizeof (long))
- error_uinteger ((unsigned long) ptrdiffval);
- else
- error_uinteger (ptrdiffval);
+ unsigned long long a = spec[n++].u.ptrdiffval, m;
+#ifdef PTRDIFF_MAX
+ m = PTRDIFF_MAX;
+#else
+ m = INTTYPE_MAXIMUM (ptrdiff_t);
+#endif
+ m = 2 * m + 1;
+ error_uinteger (a & m);
}
else
error_integer (spec[n++].u.ptrdiffval);
diff --git a/gcc/pretty-print.cc b/gcc/pretty-print.cc
index 825175787a84..67c213bbaf21 100644
--- a/gcc/pretty-print.cc
+++ b/gcc/pretty-print.cc
@@ -752,6 +752,9 @@ output_buffer::~output_buffer ()
obstack_free (&formatted_obstack, NULL);
}
+#ifndef PTRDIFF_MAX
+#define PTRDIFF_MAX INTTYPE_MAXIMUM (ptrdiff_t)
+#endif
/* Format an integer given by va_arg (ARG, type-specifier T) where
type-specifier is a precision modifier as indicated by PREC. F is
@@ -783,7 +786,15 @@ output_buffer::~output_buffer ()
break; \
\
case 4: \
- if (sizeof (ptrdiff_t) <= sizeof (int)) \
+ if (T (-1) >= T (0)) \
+ { \
+ unsigned long long a = va_arg (ARG, ptrdiff_t); \
+ unsigned long long m = PTRDIFF_MAX; \
+ m = 2 * m + 1; \
+ pp_scalar (PP, "%" HOST_LONG_LONG_FORMAT F, \
+ a & m); \
+ } \
+ else if (sizeof (ptrdiff_t) <= sizeof (int)) \
pp_scalar (PP, "%" F, \
(int) va_arg (ARG, ptrdiff_t)); \
else if (sizeof (ptrdiff_t) <= sizeof (long)) \
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2024-02-14 13:37 [gcc r14-8976] pretty-print: Fix up ptrdiff handling for %tu, %to, %tx Jakub Jelinek
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