mirror of
https://sourceware.org/git/glibc.git
synced 2025-11-03 20:53:13 +03:00
include: Sync gnulib intprops
It syncs with gnulib commit 1790ef25d81983d1d25a77d452c0080345df459b.
The main change is to proper support clang by using builtins. It
fixes a sprof build issue, where previous version uses the generic
code path when building with clang:
sprof.c:682:8: error: result of comparison of constant 288230376151711743 with expression of type 'Elf64_Half' (aka 'unsigned short') is always false [-Werror,-Wtautological-constant-out-of-range-compare]
682 | if (INT_MULTIPLY_WRAPV (ehdr2.e_shnum, sizeof (ElfW(Shdr)), &size))
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../include/intprops.h:415:34: note: expanded from macro 'INT_MULTIPLY_WRAPV'
415 | _GL_INT_OP_WRAPV (a, b, r, *, _GL_INT_MULTIPLY_RANGE_OVERFLOW)
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../include/intprops.h:504:45: note: expanded from macro '_GL_INT_OP_WRAPV'
504 | : _GL_INT_OP_WRAPV_LONGISH(a, b, r, op, overflow))
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~
../include/intprops.h:511:41: note: expanded from macro '_GL_INT_OP_WRAPV_LONGISH'
511 | : _GL_INT_OP_CALC (a, b, r, op, overflow, unsigned long int, \
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
512 | unsigned long int, 0, ULONG_MAX)) \
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../include/intprops.h:533:4: note: expanded from macro '_GL_INT_OP_CALC'
533 | (overflow (a, b, tmin, tmax) \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~
../include/intprops.h:608:22: note: expanded from macro '_GL_INT_MULTIPLY_RANGE_OVERFLOW'
608 | : (tmax) / (b) < (a)))
| ~~~~~~~~~~~~ ^ ~~~
1 error generated.
Reviewed-by: Collin Funk <collin.funk1@gmail.com>
This commit is contained in:
Adhemerval Zanella
@@ -29,8 +29,9 @@ gnulib:
|
||||
argp/argp.h
|
||||
dirent/alphasort.c
|
||||
dirent/scandir.c
|
||||
# Merged from gnulib 2021-09-21
|
||||
# Merged from gnulib 2025-10-29 (gnulib commit 1790ef25d8)
|
||||
include/intprops.h
|
||||
include/intprops-internal.h
|
||||
# Merged from gnulib 2021-09-21
|
||||
include/regex.h
|
||||
locale/programs/3level.h
|
||||
|
||||
396
include/intprops-internal.h
Normal file
396
include/intprops-internal.h
Normal file
@@ -0,0 +1,396 @@
|
||||
/* intprops-internal.h -- properties of integer types not visible to users
|
||||
|
||||
Copyright (C) 2001-2025 Free Software Foundation, Inc.
|
||||
|
||||
This program is free software: you can redistribute it and/or modify it
|
||||
under the terms of the GNU Lesser General Public License as published
|
||||
by the Free Software Foundation; either version 2.1 of the License, or
|
||||
(at your option) any later version.
|
||||
|
||||
This program is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
GNU Lesser General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU Lesser General Public License
|
||||
along with this program. If not, see <https://www.gnu.org/licenses/>. */
|
||||
|
||||
#ifndef _GL_INTPROPS_INTERNAL_H
|
||||
#define _GL_INTPROPS_INTERNAL_H
|
||||
|
||||
#include <limits.h>
|
||||
|
||||
/* Pacify GCC 13.2 in some calls to _GL_EXPR_SIGNED. */
|
||||
#if 4 < __GNUC__ + (3 <= __GNUC_MINOR__) && !defined __clang__
|
||||
# pragma GCC diagnostic ignored "-Wtype-limits"
|
||||
#endif
|
||||
|
||||
/* Return a value with the common real type of E and V and the value of V.
|
||||
Do not evaluate E. */
|
||||
#define _GL_INT_CONVERT(e, v) ((1 ? 0 : (e)) + (v))
|
||||
|
||||
/* The extra casts in the following macros work around compiler bugs,
|
||||
e.g., in Cray C 5.0.3.0. */
|
||||
|
||||
/* True if the real type T is signed. */
|
||||
#define _GL_TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
|
||||
|
||||
/* Return 1 if the real expression E, after promotion, has a
|
||||
signed or floating type. Do not evaluate E. */
|
||||
#define _GL_EXPR_SIGNED(e) (_GL_INT_CONVERT (e, -1) < 0)
|
||||
|
||||
|
||||
/* Minimum and maximum values for integer types and expressions. */
|
||||
|
||||
/* The width in bits of the integer type or expression T.
|
||||
Do not evaluate T. T must not be a bit-field expression.
|
||||
Padding bits are not supported; this is checked at compile-time below. */
|
||||
#define _GL_TYPE_WIDTH(t) (sizeof (t) * CHAR_BIT)
|
||||
|
||||
/* The maximum and minimum values for the type of the expression E,
|
||||
after integer promotion. E is not evaluated. */
|
||||
#define _GL_INT_MINIMUM(e) \
|
||||
(_GL_EXPR_SIGNED (e) \
|
||||
? ~ _GL_SIGNED_INT_MAXIMUM (e) \
|
||||
: _GL_INT_CONVERT (e, 0))
|
||||
#define _GL_INT_MAXIMUM(e) \
|
||||
(_GL_EXPR_SIGNED (e) \
|
||||
? _GL_SIGNED_INT_MAXIMUM (e) \
|
||||
: _GL_INT_CONVERT (e, -1))
|
||||
#define _GL_SIGNED_INT_MAXIMUM(e) \
|
||||
(((_GL_INT_CONVERT (e, 1) << (_GL_TYPE_WIDTH (+ (e)) - 2)) - 1) * 2 + 1)
|
||||
|
||||
/* Work around OpenVMS incompatibility with C99. */
|
||||
#if !defined LLONG_MAX && defined __INT64_MAX
|
||||
# define LLONG_MAX __INT64_MAX
|
||||
# define LLONG_MIN __INT64_MIN
|
||||
#endif
|
||||
|
||||
/* This include file assumes that signed types are two's complement without
|
||||
padding bits; the above macros have undefined behavior otherwise.
|
||||
If this is a problem for you, please let us know how to fix it for your host.
|
||||
This assumption is tested by the intprops-tests module. */
|
||||
|
||||
/* Does the __typeof__ keyword work? This could be done by
|
||||
'configure', but for now it's easier to do it by hand. */
|
||||
#if ((defined __GNUC__ && 2 <= __GNUC__) \
|
||||
|| (defined __clang_major__ && 4 <= __clang_major__) \
|
||||
|| (defined __IBMC__ && 1210 <= __IBMC__ && defined __IBM__TYPEOF__) \
|
||||
|| (defined __SUNPRO_C && 0x5110 <= __SUNPRO_C && !__STDC__) \
|
||||
|| (defined _MSC_VER && 1939 <= _MSC_VER))
|
||||
# define _GL_HAVE___TYPEOF__ 1
|
||||
#else
|
||||
# define _GL_HAVE___TYPEOF__ 0
|
||||
#endif
|
||||
|
||||
/* Return 1 if the integer type or expression T might be signed. Return 0
|
||||
if it is definitely unsigned. T must not be a bit-field expression.
|
||||
This macro does not evaluate its argument, and expands to an
|
||||
integer constant expression. */
|
||||
#if _GL_HAVE___TYPEOF__
|
||||
# define _GL_SIGNED_TYPE_OR_EXPR(t) _GL_TYPE_SIGNED (__typeof__ (t))
|
||||
#else
|
||||
# define _GL_SIGNED_TYPE_OR_EXPR(t) 1
|
||||
#endif
|
||||
|
||||
/* Return 1 if - A would overflow in [MIN,MAX] arithmetic.
|
||||
A should not have side effects, and A's type should be an
|
||||
integer with minimum value MIN and maximum MAX. */
|
||||
#define _GL_INT_NEGATE_RANGE_OVERFLOW(a, min, max) \
|
||||
((min) < 0 ? (a) < - (max) : 0 < (a))
|
||||
|
||||
/* True if __builtin_add_overflow (A, B, P) and __builtin_sub_overflow
|
||||
(A, B, P) work when P is non-null. */
|
||||
#ifdef __EDG__
|
||||
/* EDG-based compilers like nvc 22.1 cannot add 64-bit signed to unsigned
|
||||
<https://bugs.gnu.org/53256>. */
|
||||
# define _GL_HAS_BUILTIN_ADD_OVERFLOW 0
|
||||
#elif defined __has_builtin
|
||||
# define _GL_HAS_BUILTIN_ADD_OVERFLOW __has_builtin (__builtin_add_overflow)
|
||||
/* __builtin_{add,sub}_overflow exists but is not reliable in GCC 5.x and 6.x,
|
||||
see <https://gcc.gnu.org/PR98269>. */
|
||||
#elif 7 <= __GNUC__
|
||||
# define _GL_HAS_BUILTIN_ADD_OVERFLOW 1
|
||||
#else
|
||||
# define _GL_HAS_BUILTIN_ADD_OVERFLOW 0
|
||||
#endif
|
||||
|
||||
/* True if __builtin_mul_overflow (A, B, P) works when P is non-null. */
|
||||
#if defined __clang_major__ && __clang_major__ < 14
|
||||
/* Work around Clang bug <https://bugs.llvm.org/show_bug.cgi?id=16404>. */
|
||||
# define _GL_HAS_BUILTIN_MUL_OVERFLOW 0
|
||||
#else
|
||||
# define _GL_HAS_BUILTIN_MUL_OVERFLOW _GL_HAS_BUILTIN_ADD_OVERFLOW
|
||||
#endif
|
||||
|
||||
/* True if __builtin_add_overflow_p (A, B, C) works, and similarly for
|
||||
__builtin_sub_overflow_p and __builtin_mul_overflow_p. */
|
||||
#ifdef __EDG__
|
||||
/* In EDG-based compilers like ICC 2021.3 and earlier,
|
||||
__builtin_add_overflow_p etc. are not treated as integral constant
|
||||
expressions even when all arguments are. */
|
||||
# define _GL_HAS_BUILTIN_OVERFLOW_P 0
|
||||
#elif defined __has_builtin
|
||||
# define _GL_HAS_BUILTIN_OVERFLOW_P __has_builtin (__builtin_mul_overflow_p)
|
||||
#else
|
||||
# define _GL_HAS_BUILTIN_OVERFLOW_P (7 <= __GNUC__)
|
||||
#endif
|
||||
|
||||
#if (!defined _GL_STDCKDINT_H && 202311 <= __STDC_VERSION__ \
|
||||
&& ! (_GL_HAS_BUILTIN_ADD_OVERFLOW && _GL_HAS_BUILTIN_MUL_OVERFLOW))
|
||||
# include <stdckdint.h>
|
||||
#endif
|
||||
|
||||
/* Store the low-order bits of A + B, A - B, A * B, respectively, into *R.
|
||||
Return 1 if the result overflows. Arguments should not have side
|
||||
effects and A, B and *R can be of any integer type other than char,
|
||||
bool, a bit-precise integer type, or an enumeration type. */
|
||||
#if _GL_HAS_BUILTIN_ADD_OVERFLOW
|
||||
# define _GL_INT_ADD_WRAPV(a, b, r) __builtin_add_overflow (a, b, r)
|
||||
# define _GL_INT_SUBTRACT_WRAPV(a, b, r) __builtin_sub_overflow (a, b, r)
|
||||
#elif defined ckd_add && defined ckd_sub && !defined _GL_STDCKDINT_H
|
||||
# define _GL_INT_ADD_WRAPV(a, b, r) ckd_add (r, + (a), + (b))
|
||||
# define _GL_INT_SUBTRACT_WRAPV(a, b, r) ckd_sub (r, + (a), + (b))
|
||||
#else
|
||||
# define _GL_INT_ADD_WRAPV(a, b, r) \
|
||||
_GL_INT_OP_WRAPV (a, b, r, +, _GL_INT_ADD_RANGE_OVERFLOW)
|
||||
# define _GL_INT_SUBTRACT_WRAPV(a, b, r) \
|
||||
_GL_INT_OP_WRAPV (a, b, r, -, _GL_INT_SUBTRACT_RANGE_OVERFLOW)
|
||||
#endif
|
||||
#if _GL_HAS_BUILTIN_MUL_OVERFLOW
|
||||
# if ((9 < __GNUC__ + (3 <= __GNUC_MINOR__) \
|
||||
|| (__GNUC__ == 8 && 4 <= __GNUC_MINOR__)) \
|
||||
&& !defined __clang__ && !defined __EDG__)
|
||||
# define _GL_INT_MULTIPLY_WRAPV(a, b, r) __builtin_mul_overflow (a, b, r)
|
||||
# else
|
||||
/* Work around GCC bug 91450. */
|
||||
# define _GL_INT_MULTIPLY_WRAPV(a, b, r) \
|
||||
((!_GL_SIGNED_TYPE_OR_EXPR (*(r)) && _GL_EXPR_SIGNED (a) && _GL_EXPR_SIGNED (b) \
|
||||
&& _GL_INT_MULTIPLY_RANGE_OVERFLOW (a, b, \
|
||||
(__typeof__ (*(r))) 0, \
|
||||
(__typeof__ (*(r))) -1)) \
|
||||
? ((void) __builtin_mul_overflow (a, b, r), 1) \
|
||||
: __builtin_mul_overflow (a, b, r))
|
||||
# endif
|
||||
#elif defined ckd_mul && !defined _GL_STDCKDINT_H
|
||||
# define _GL_INT_MULTIPLY_WRAPV(a, b, r) ckd_mul (r, + (a), + (b))
|
||||
#else
|
||||
# define _GL_INT_MULTIPLY_WRAPV(a, b, r) \
|
||||
_GL_INT_OP_WRAPV (a, b, r, *, _GL_INT_MULTIPLY_RANGE_OVERFLOW)
|
||||
#endif
|
||||
|
||||
/* Nonzero if this compiler has GCC bug 68193 or Clang bug 25390. See:
|
||||
https://gcc.gnu.org/PR68193
|
||||
https://llvm.org/bugs/show_bug.cgi?id=25390
|
||||
For now, assume GCC < 14 and all Clang versions generate bogus
|
||||
warnings for _Generic. This matters only for compilers that
|
||||
lack relevant builtins. */
|
||||
#if (__GNUC__ && __GNUC__ < 14) || defined __clang__
|
||||
# define _GL__GENERIC_BOGUS 1
|
||||
#else
|
||||
# define _GL__GENERIC_BOGUS 0
|
||||
#endif
|
||||
|
||||
/* Store the low-order bits of A <op> B into *R, where OP specifies
|
||||
the operation and OVERFLOW the overflow predicate. Return 1 if the
|
||||
result overflows. Arguments should not have side effects,
|
||||
and A, B and *R can be of any integer type other than char, bool, a
|
||||
bit-precise integer type, or an enumeration type. */
|
||||
#if 201112 <= __STDC_VERSION__ && !_GL__GENERIC_BOGUS
|
||||
# define _GL_INT_OP_WRAPV(a, b, r, op, overflow) \
|
||||
(_Generic \
|
||||
(*(r), \
|
||||
signed char: \
|
||||
_GL_INT_OP_CALC (a, b, r, op, overflow, unsigned int, \
|
||||
signed char, SCHAR_MIN, SCHAR_MAX), \
|
||||
unsigned char: \
|
||||
_GL_INT_OP_CALC (a, b, r, op, overflow, unsigned int, \
|
||||
unsigned char, 0, UCHAR_MAX), \
|
||||
short int: \
|
||||
_GL_INT_OP_CALC (a, b, r, op, overflow, unsigned int, \
|
||||
short int, SHRT_MIN, SHRT_MAX), \
|
||||
unsigned short int: \
|
||||
_GL_INT_OP_CALC (a, b, r, op, overflow, unsigned int, \
|
||||
unsigned short int, 0, USHRT_MAX), \
|
||||
int: \
|
||||
_GL_INT_OP_CALC (a, b, r, op, overflow, unsigned int, \
|
||||
int, INT_MIN, INT_MAX), \
|
||||
unsigned int: \
|
||||
_GL_INT_OP_CALC (a, b, r, op, overflow, unsigned int, \
|
||||
unsigned int, 0, UINT_MAX), \
|
||||
long int: \
|
||||
_GL_INT_OP_CALC (a, b, r, op, overflow, unsigned long int, \
|
||||
long int, LONG_MIN, LONG_MAX), \
|
||||
unsigned long int: \
|
||||
_GL_INT_OP_CALC (a, b, r, op, overflow, unsigned long int, \
|
||||
unsigned long int, 0, ULONG_MAX), \
|
||||
long long int: \
|
||||
_GL_INT_OP_CALC (a, b, r, op, overflow, unsigned long long int, \
|
||||
long long int, LLONG_MIN, LLONG_MAX), \
|
||||
unsigned long long int: \
|
||||
_GL_INT_OP_CALC (a, b, r, op, overflow, unsigned long long int, \
|
||||
unsigned long long int, 0, ULLONG_MAX)))
|
||||
#else
|
||||
/* Store the low-order bits of A <op> B into *R, where OP specifies
|
||||
the operation and OVERFLOW the overflow predicate. If *R is
|
||||
signed, its type is ST with bounds SMIN..SMAX; otherwise its type
|
||||
is UT with bounds U..UMAX. ST and UT are narrower than int.
|
||||
Return 1 if the result overflows. Arguments should not have side
|
||||
effects, and A, B and *R can be of any integer type other than
|
||||
char, bool, a bit-precise integer type, or an enumeration type. */
|
||||
# if _GL_HAVE___TYPEOF__
|
||||
# define _GL_INT_OP_WRAPV_SMALLISH(a,b,r,op,overflow,st,smin,smax,ut,umax) \
|
||||
(_GL_TYPE_SIGNED (__typeof__ (*(r))) \
|
||||
? _GL_INT_OP_CALC (a, b, r, op, overflow, unsigned int, st, smin, smax) \
|
||||
: _GL_INT_OP_CALC (a, b, r, op, overflow, unsigned int, ut, 0, umax))
|
||||
# else
|
||||
# define _GL_INT_OP_WRAPV_SMALLISH(a,b,r,op,overflow,st,smin,smax,ut,umax) \
|
||||
(overflow (a, b, smin, smax) \
|
||||
? (overflow (a, b, 0, umax) \
|
||||
? (*(r) = _GL_INT_OP_WRAPV_VIA_UNSIGNED (a,b,op,unsigned,st), 1) \
|
||||
: (*(r) = _GL_INT_OP_WRAPV_VIA_UNSIGNED (a,b,op,unsigned,st)) < 0) \
|
||||
: (overflow (a, b, 0, umax) \
|
||||
? (*(r) = _GL_INT_OP_WRAPV_VIA_UNSIGNED (a,b,op,unsigned,st)) >= 0 \
|
||||
: (*(r) = _GL_INT_OP_WRAPV_VIA_UNSIGNED (a,b,op,unsigned,st), 0)))
|
||||
# endif
|
||||
|
||||
# define _GL_INT_OP_WRAPV(a, b, r, op, overflow) \
|
||||
(sizeof *(r) == sizeof (signed char) \
|
||||
? _GL_INT_OP_WRAPV_SMALLISH (a, b, r, op, overflow, \
|
||||
signed char, SCHAR_MIN, SCHAR_MAX, \
|
||||
unsigned char, UCHAR_MAX) \
|
||||
: sizeof *(r) == sizeof (short int) \
|
||||
? _GL_INT_OP_WRAPV_SMALLISH (a, b, r, op, overflow, \
|
||||
short int, SHRT_MIN, SHRT_MAX, \
|
||||
unsigned short int, USHRT_MAX) \
|
||||
: sizeof *(r) == sizeof (int) \
|
||||
? (_GL_EXPR_SIGNED (*(r)) \
|
||||
? _GL_INT_OP_CALC (a, b, r, op, overflow, unsigned int, \
|
||||
int, INT_MIN, INT_MAX) \
|
||||
: _GL_INT_OP_CALC (a, b, r, op, overflow, unsigned int, \
|
||||
unsigned int, 0, UINT_MAX)) \
|
||||
: _GL_INT_OP_WRAPV_LONGISH(a, b, r, op, overflow))
|
||||
# ifdef LLONG_MAX
|
||||
# define _GL_INT_OP_WRAPV_LONGISH(a, b, r, op, overflow) \
|
||||
(sizeof *(r) == sizeof (long int) \
|
||||
? (_GL_EXPR_SIGNED (*(r)) \
|
||||
? _GL_INT_OP_CALC (a, b, r, op, overflow, unsigned long int, \
|
||||
long int, LONG_MIN, LONG_MAX) \
|
||||
: _GL_INT_OP_CALC (a, b, r, op, overflow, unsigned long int, \
|
||||
unsigned long int, 0, ULONG_MAX)) \
|
||||
: (_GL_EXPR_SIGNED (*(r)) \
|
||||
? _GL_INT_OP_CALC (a, b, r, op, overflow, unsigned long long int, \
|
||||
long long int, LLONG_MIN, LLONG_MAX) \
|
||||
: _GL_INT_OP_CALC (a, b, r, op, overflow, unsigned long long int, \
|
||||
unsigned long long int, 0, ULLONG_MAX)))
|
||||
# else
|
||||
# define _GL_INT_OP_WRAPV_LONGISH(a, b, r, op, overflow) \
|
||||
(_GL_EXPR_SIGNED (*(r)) \
|
||||
? _GL_INT_OP_CALC (a, b, r, op, overflow, unsigned long int, \
|
||||
long int, LONG_MIN, LONG_MAX) \
|
||||
: _GL_INT_OP_CALC (a, b, r, op, overflow, unsigned long int, \
|
||||
unsigned long int, 0, ULONG_MAX))
|
||||
# endif
|
||||
#endif
|
||||
|
||||
/* Store the low-order bits of A <op> B into *R, where the operation
|
||||
is given by OP. Use the unsigned type UT for calculation to avoid
|
||||
overflow problems. *R's type is T, with extrema TMIN and TMAX.
|
||||
T can be any signed integer type other than char, bool, a
|
||||
bit-precise integer type, or an enumeration type.
|
||||
Return 1 if the result overflows. */
|
||||
#define _GL_INT_OP_CALC(a, b, r, op, overflow, ut, t, tmin, tmax) \
|
||||
(overflow (a, b, tmin, tmax) \
|
||||
? (*(r) = _GL_INT_OP_WRAPV_VIA_UNSIGNED (a, b, op, ut, t), 1) \
|
||||
: (*(r) = _GL_INT_OP_WRAPV_VIA_UNSIGNED (a, b, op, ut, t), 0))
|
||||
|
||||
/* Return 1 if the integer expressions A - B and -A would overflow,
|
||||
respectively. Arguments should not have side effects,
|
||||
and can be any signed integer type other than char, bool, a
|
||||
bit-precise integer type, or an enumeration type.
|
||||
These macros are tuned for their last input argument being a constant. */
|
||||
|
||||
#if _GL_HAS_BUILTIN_OVERFLOW_P
|
||||
# define _GL_INT_NEGATE_OVERFLOW(a) \
|
||||
__builtin_sub_overflow_p (0, a, (__typeof__ (- (a))) 0)
|
||||
#else
|
||||
# define _GL_INT_NEGATE_OVERFLOW(a) \
|
||||
_GL_INT_NEGATE_RANGE_OVERFLOW (a, _GL_INT_MINIMUM (a), _GL_INT_MAXIMUM (a))
|
||||
#endif
|
||||
|
||||
/* Return the low-order bits of A <op> B, where the operation is given
|
||||
by OP. Use the unsigned type UT for calculation to avoid undefined
|
||||
behavior on signed integer overflow, and convert the result to type T.
|
||||
UT is at least as wide as T and is no narrower than unsigned int,
|
||||
T is two's complement, and there is no padding or trap representations.
|
||||
Assume that converting UT to T yields the low-order bits, as is
|
||||
done in all known two's-complement C compilers. E.g., see:
|
||||
https://gcc.gnu.org/onlinedocs/gcc/Integers-implementation.html
|
||||
|
||||
According to the C standard, converting UT to T yields an
|
||||
implementation-defined result or signal for values outside T's
|
||||
range. However, code that works around this theoretical problem
|
||||
runs afoul of a compiler bug in Oracle Studio 12.3 x86. See:
|
||||
https://lists.gnu.org/r/bug-gnulib/2017-04/msg00049.html
|
||||
As the compiler bug is real, don't try to work around the
|
||||
theoretical problem. */
|
||||
|
||||
#define _GL_INT_OP_WRAPV_VIA_UNSIGNED(a, b, op, ut, t) \
|
||||
((t) ((ut) (a) op (ut) (b)))
|
||||
|
||||
/* Return true if the numeric values A + B, A - B, A * B fall outside
|
||||
the range TMIN..TMAX. Arguments should not have side effects
|
||||
and can be any integer type other than char, bool,
|
||||
a bit-precise integer type, or an enumeration type.
|
||||
TMIN should be signed and nonpositive.
|
||||
TMAX should be positive, and should be signed unless TMIN is zero. */
|
||||
#define _GL_INT_ADD_RANGE_OVERFLOW(a, b, tmin, tmax) \
|
||||
((b) < 0 \
|
||||
? (((tmin) \
|
||||
? ((_GL_EXPR_SIGNED (_GL_INT_CONVERT (a, (tmin) - (b))) || (b) < (tmin)) \
|
||||
&& (a) < (tmin) - (b)) \
|
||||
: (a) <= -1 - (b)) \
|
||||
|| ((_GL_EXPR_SIGNED (a) ? 0 <= (a) : (tmax) < (a)) && (tmax) < (a) + (b))) \
|
||||
: (a) < 0 \
|
||||
? (((tmin) \
|
||||
? ((_GL_EXPR_SIGNED (_GL_INT_CONVERT (b, (tmin) - (a))) || (a) < (tmin)) \
|
||||
&& (b) < (tmin) - (a)) \
|
||||
: (b) <= -1 - (a)) \
|
||||
|| ((_GL_EXPR_SIGNED (_GL_INT_CONVERT (a, b)) || (tmax) < (b)) \
|
||||
&& (tmax) < (a) + (b))) \
|
||||
: (tmax) < (b) || (tmax) - (b) < (a))
|
||||
#define _GL_INT_SUBTRACT_RANGE_OVERFLOW(a, b, tmin, tmax) \
|
||||
(((a) < 0) == ((b) < 0) \
|
||||
? ((a) < (b) \
|
||||
? !(tmin) || -1 - (tmin) < (b) - (a) - 1 \
|
||||
: (tmax) < (a) - (b)) \
|
||||
: (a) < 0 \
|
||||
? ((!_GL_EXPR_SIGNED (_GL_INT_CONVERT ((a) - (tmin), b)) && (a) - (tmin) < 0) \
|
||||
|| (a) - (tmin) < (b)) \
|
||||
: ((! (_GL_EXPR_SIGNED (_GL_INT_CONVERT (tmax, b)) \
|
||||
&& _GL_EXPR_SIGNED (_GL_INT_CONVERT ((tmax) + (b), a))) \
|
||||
&& (tmax) <= -1 - (b)) \
|
||||
|| (tmax) + (b) < (a)))
|
||||
#define _GL_INT_MULTIPLY_RANGE_OVERFLOW(a, b, tmin, tmax) \
|
||||
((b) < 0 \
|
||||
? ((a) < 0 \
|
||||
? (_GL_EXPR_SIGNED (_GL_INT_CONVERT (tmax, b)) \
|
||||
? (a) < (tmax) / (b) \
|
||||
: ((_GL_INT_NEGATE_OVERFLOW (b) \
|
||||
? _GL_INT_CONVERT (b, tmax) >> (_GL_TYPE_WIDTH (+ (b)) - 1) \
|
||||
: (tmax) / -(b)) \
|
||||
<= -1 - (a))) \
|
||||
: _GL_INT_NEGATE_OVERFLOW (_GL_INT_CONVERT (b, tmin)) && (b) == -1 \
|
||||
? (_GL_EXPR_SIGNED (a) \
|
||||
? 0 < (a) + (tmin) \
|
||||
: 0 < (a) && -1 - (tmin) < (a) - 1) \
|
||||
: (tmin) / (b) < (a)) \
|
||||
: (b) == 0 \
|
||||
? 0 \
|
||||
: ((a) < 0 \
|
||||
? (_GL_INT_NEGATE_OVERFLOW (_GL_INT_CONVERT (a, tmin)) && (a) == -1 \
|
||||
? (_GL_EXPR_SIGNED (b) ? 0 < (b) + (tmin) : -1 - (tmin) < (b) - 1) \
|
||||
: (tmin) / (a) < (b)) \
|
||||
: (tmax) / (b) < (a)))
|
||||
|
||||
#endif /* _GL_INTPROPS_INTERNAL_H */
|
||||
@@ -15,19 +15,10 @@
|
||||
You should have received a copy of the GNU Lesser General Public License
|
||||
along with this program. If not, see <https://www.gnu.org/licenses/>. */
|
||||
|
||||
|
||||
#ifndef _GL_INTPROPS_H
|
||||
#define _GL_INTPROPS_H
|
||||
|
||||
#include <limits.h>
|
||||
|
||||
/* Return a value with the common real type of E and V and the value of V.
|
||||
Do not evaluate E. */
|
||||
#define _GL_INT_CONVERT(e, v) ((1 ? 0 : (e)) + (v))
|
||||
|
||||
/* Act like _GL_INT_CONVERT (E, -V) but work around a bug in IRIX 6.5 cc; see
|
||||
<https://lists.gnu.org/r/bug-gnulib/2011-05/msg00406.html>. */
|
||||
#define _GL_INT_NEGATE_CONVERT(e, v) ((1 ? 0 : (e)) - (v))
|
||||
#include "intprops-internal.h"
|
||||
|
||||
/* The extra casts in the following macros work around compiler bugs,
|
||||
e.g., in Cray C 5.0.3.0. */
|
||||
@@ -37,11 +28,19 @@
|
||||
#define TYPE_IS_INTEGER(t) ((t) 1.5 == 1)
|
||||
|
||||
/* True if the real type T is signed. */
|
||||
#define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
|
||||
#define TYPE_SIGNED(t) _GL_TYPE_SIGNED (t)
|
||||
|
||||
/* Return 1 if the real expression E, after promotion, has a
|
||||
signed or floating type. Do not evaluate E. */
|
||||
#define EXPR_SIGNED(e) (_GL_INT_NEGATE_CONVERT (e, 1) < 0)
|
||||
#define EXPR_SIGNED(e) _GL_EXPR_SIGNED (e)
|
||||
|
||||
/* The same value as as the arithmetic expression E, but with E's type
|
||||
after integer promotions. For example, if E is of type 'enum {A, B}'
|
||||
then 'switch (INT_PROMOTE (E))' pacifies gcc -Wswitch-enum if some
|
||||
enum values are deliberately omitted from the switch's cases.
|
||||
Here, unary + is safer than a cast or inline function, as unary +
|
||||
does only integer promotions and is disallowed on pointers. */
|
||||
#define INT_PROMOTE(e) (+ (e))
|
||||
|
||||
|
||||
/* Minimum and maximum values for integer types and expressions. */
|
||||
@@ -49,7 +48,7 @@
|
||||
/* The width in bits of the integer type or expression T.
|
||||
Do not evaluate T. T must not be a bit-field expression.
|
||||
Padding bits are not supported; this is checked at compile-time below. */
|
||||
#define TYPE_WIDTH(t) (sizeof (t) * CHAR_BIT)
|
||||
#define TYPE_WIDTH(t) _GL_TYPE_WIDTH (t)
|
||||
|
||||
/* The maximum and minimum values for the integer type T. */
|
||||
#define TYPE_MINIMUM(t) ((t) ~ TYPE_MAXIMUM (t))
|
||||
@@ -58,51 +57,6 @@
|
||||
? (t) -1 \
|
||||
: ((((t) 1 << (TYPE_WIDTH (t) - 2)) - 1) * 2 + 1)))
|
||||
|
||||
/* The maximum and minimum values for the type of the expression E,
|
||||
after integer promotion. E is not evaluated. */
|
||||
#define _GL_INT_MINIMUM(e) \
|
||||
(EXPR_SIGNED (e) \
|
||||
? ~ _GL_SIGNED_INT_MAXIMUM (e) \
|
||||
: _GL_INT_CONVERT (e, 0))
|
||||
#define _GL_INT_MAXIMUM(e) \
|
||||
(EXPR_SIGNED (e) \
|
||||
? _GL_SIGNED_INT_MAXIMUM (e) \
|
||||
: _GL_INT_NEGATE_CONVERT (e, 1))
|
||||
#define _GL_SIGNED_INT_MAXIMUM(e) \
|
||||
(((_GL_INT_CONVERT (e, 1) << (TYPE_WIDTH (+ (e)) - 2)) - 1) * 2 + 1)
|
||||
|
||||
/* Work around OpenVMS incompatibility with C99. */
|
||||
#if !defined LLONG_MAX && defined __INT64_MAX
|
||||
# define LLONG_MAX __INT64_MAX
|
||||
# define LLONG_MIN __INT64_MIN
|
||||
#endif
|
||||
|
||||
/* This include file assumes that signed types are two's complement without
|
||||
padding bits; the above macros have undefined behavior otherwise.
|
||||
If this is a problem for you, please let us know how to fix it for your host.
|
||||
This assumption is tested by the intprops-tests module. */
|
||||
|
||||
/* Does the __typeof__ keyword work? This could be done by
|
||||
'configure', but for now it's easier to do it by hand. */
|
||||
#if (2 <= __GNUC__ \
|
||||
|| (4 <= __clang_major__) \
|
||||
|| (1210 <= __IBMC__ && defined __IBM__TYPEOF__) \
|
||||
|| (0x5110 <= __SUNPRO_C && !__STDC__))
|
||||
# define _GL_HAVE___TYPEOF__ 1
|
||||
#else
|
||||
# define _GL_HAVE___TYPEOF__ 0
|
||||
#endif
|
||||
|
||||
/* Return 1 if the integer type or expression T might be signed. Return 0
|
||||
if it is definitely unsigned. T must not be a bit-field expression.
|
||||
This macro does not evaluate its argument, and expands to an
|
||||
integer constant expression. */
|
||||
#if _GL_HAVE___TYPEOF__
|
||||
# define _GL_SIGNED_TYPE_OR_EXPR(t) TYPE_SIGNED (__typeof__ (t))
|
||||
#else
|
||||
# define _GL_SIGNED_TYPE_OR_EXPR(t) 1
|
||||
#endif
|
||||
|
||||
/* Bound on length of the string representing an unsigned integer
|
||||
value representable in B bits. log10 (2.0) < 146/485. The
|
||||
smallest value of B where this bound is not tight is 2621. */
|
||||
@@ -129,12 +83,11 @@
|
||||
/* Range overflow checks.
|
||||
|
||||
The INT_<op>_RANGE_OVERFLOW macros return 1 if the corresponding C
|
||||
operators might not yield numerically correct answers due to
|
||||
arithmetic overflow. They do not rely on undefined or
|
||||
implementation-defined behavior. Their implementations are simple
|
||||
and straightforward, but they are harder to use and may be less
|
||||
efficient than the INT_<op>_WRAPV, INT_<op>_OK, and
|
||||
INT_<op>_OVERFLOW macros described below.
|
||||
operators overflow arithmetically when given the same arguments.
|
||||
These macros do not rely on undefined or implementation-defined behavior.
|
||||
Although their implementations are simple and straightforward,
|
||||
they are harder to use and may be less efficient than the
|
||||
INT_<op>_WRAPV, INT_<op>_OK, and INT_<op>_OVERFLOW macros described below.
|
||||
|
||||
Example usage:
|
||||
|
||||
@@ -181,9 +134,7 @@
|
||||
/* Return 1 if - A would overflow in [MIN,MAX] arithmetic.
|
||||
See above for restrictions. */
|
||||
#define INT_NEGATE_RANGE_OVERFLOW(a, min, max) \
|
||||
((min) < 0 \
|
||||
? (a) < - (max) \
|
||||
: 0 < (a))
|
||||
_GL_INT_NEGATE_RANGE_OVERFLOW (a, min, max)
|
||||
|
||||
/* Return 1 if A * B would overflow in [MIN,MAX] arithmetic.
|
||||
See above for restrictions. Avoid && and || as they tickle
|
||||
@@ -227,40 +178,6 @@
|
||||
? (a) < (min) >> (b) \
|
||||
: (max) >> (b) < (a))
|
||||
|
||||
/* True if __builtin_add_overflow (A, B, P) and __builtin_sub_overflow
|
||||
(A, B, P) work when P is non-null. */
|
||||
/* __builtin_{add,sub}_overflow exists but is not reliable in GCC 5.x and 6.x,
|
||||
see <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98269>. */
|
||||
#if 7 <= __GNUC__ && !defined __ICC
|
||||
# define _GL_HAS_BUILTIN_ADD_OVERFLOW 1
|
||||
#elif defined __has_builtin
|
||||
# define _GL_HAS_BUILTIN_ADD_OVERFLOW __has_builtin (__builtin_add_overflow)
|
||||
#else
|
||||
# define _GL_HAS_BUILTIN_ADD_OVERFLOW 0
|
||||
#endif
|
||||
|
||||
/* True if __builtin_mul_overflow (A, B, P) works when P is non-null. */
|
||||
#ifdef __clang__
|
||||
/* Work around Clang bug <https://bugs.llvm.org/show_bug.cgi?id=16404>. */
|
||||
# define _GL_HAS_BUILTIN_MUL_OVERFLOW 0
|
||||
#else
|
||||
# define _GL_HAS_BUILTIN_MUL_OVERFLOW _GL_HAS_BUILTIN_ADD_OVERFLOW
|
||||
#endif
|
||||
|
||||
/* True if __builtin_add_overflow_p (A, B, C) works, and similarly for
|
||||
__builtin_sub_overflow_p and __builtin_mul_overflow_p. */
|
||||
#if defined __clang__ || defined __ICC
|
||||
/* Clang 11 lacks __builtin_mul_overflow_p, and even if it did it
|
||||
would presumably run afoul of Clang bug 16404. ICC 2021.1's
|
||||
__builtin_add_overflow_p etc. are not treated as integral constant
|
||||
expressions even when all arguments are. */
|
||||
# define _GL_HAS_BUILTIN_OVERFLOW_P 0
|
||||
#elif defined __has_builtin
|
||||
# define _GL_HAS_BUILTIN_OVERFLOW_P __has_builtin (__builtin_mul_overflow_p)
|
||||
#else
|
||||
# define _GL_HAS_BUILTIN_OVERFLOW_P (7 <= __GNUC__)
|
||||
#endif
|
||||
|
||||
/* The _GL*_OVERFLOW macros have the same restrictions as the
|
||||
*_RANGE_OVERFLOW macros, except that they do not assume that operands
|
||||
(e.g., A and B) have the same type as MIN and MAX. Instead, they assume
|
||||
@@ -288,11 +205,11 @@
|
||||
|| INT_MULTIPLY_RANGE_OVERFLOW (a, b, min, max))
|
||||
#endif
|
||||
#define _GL_DIVIDE_OVERFLOW(a, b, min, max) \
|
||||
((min) < 0 ? (b) == _GL_INT_NEGATE_CONVERT (min, 1) && (a) < - (max) \
|
||||
((min) < 0 ? (b) == _GL_INT_CONVERT (min, -1) && (a) < - (max) \
|
||||
: (a) < 0 ? (b) <= (a) + (b) - 1 \
|
||||
: (b) < 0 && (a) + (b) <= (a))
|
||||
#define _GL_REMAINDER_OVERFLOW(a, b, min, max) \
|
||||
((min) < 0 ? (b) == _GL_INT_NEGATE_CONVERT (min, 1) && (a) < - (max) \
|
||||
((min) < 0 ? (b) == _GL_INT_CONVERT (min, -1) && (a) < - (max) \
|
||||
: (a) < 0 ? (a) % (b) != ((max) - (b) + 1) % (b) \
|
||||
: (b) < 0 && ! _GL_UNSIGNED_NEG_MULTIPLE (a, b, max))
|
||||
|
||||
@@ -347,13 +264,18 @@
|
||||
Because the WRAPV macros convert the result, they report overflow
|
||||
in different circumstances than the OVERFLOW macros do. For
|
||||
example, in the typical case with 16-bit 'short' and 32-bit 'int',
|
||||
if A, B and R are all of type 'short' then INT_ADD_OVERFLOW (A, B)
|
||||
if A, B and *R are all of type 'short' then INT_ADD_OVERFLOW (A, B)
|
||||
returns false because the addition cannot overflow after A and B
|
||||
are converted to 'int', whereas INT_ADD_WRAPV (A, B, &R) returns
|
||||
are converted to 'int', whereas INT_ADD_WRAPV (A, B, R) returns
|
||||
true or false depending on whether the sum fits into 'short'.
|
||||
|
||||
These macros are tuned for their last input argument being a constant.
|
||||
|
||||
A, B, and *R should be integers; they need not be the same type,
|
||||
and they need not be all signed or all unsigned.
|
||||
However, none of the integer types should be bit-precise,
|
||||
and *R's type should not be char, bool, or an enumeration type.
|
||||
|
||||
Return 1 if the integer expressions A * B, A - B, -A, A * B, A / B,
|
||||
A % B, and A << B would overflow, respectively. */
|
||||
|
||||
@@ -361,12 +283,7 @@
|
||||
_GL_BINARY_OP_OVERFLOW (a, b, _GL_ADD_OVERFLOW)
|
||||
#define INT_SUBTRACT_OVERFLOW(a, b) \
|
||||
_GL_BINARY_OP_OVERFLOW (a, b, _GL_SUBTRACT_OVERFLOW)
|
||||
#if _GL_HAS_BUILTIN_OVERFLOW_P
|
||||
# define INT_NEGATE_OVERFLOW(a) INT_SUBTRACT_OVERFLOW (0, a)
|
||||
#else
|
||||
# define INT_NEGATE_OVERFLOW(a) \
|
||||
INT_NEGATE_RANGE_OVERFLOW (a, _GL_INT_MINIMUM (a), _GL_INT_MAXIMUM (a))
|
||||
#endif
|
||||
#define INT_NEGATE_OVERFLOW(a) _GL_INT_NEGATE_OVERFLOW (a)
|
||||
#define INT_MULTIPLY_OVERFLOW(a, b) \
|
||||
_GL_BINARY_OP_OVERFLOW (a, b, _GL_MULTIPLY_OVERFLOW)
|
||||
#define INT_DIVIDE_OVERFLOW(a, b) \
|
||||
@@ -388,224 +305,9 @@
|
||||
|
||||
/* Store the low-order bits of A + B, A - B, A * B, respectively, into *R.
|
||||
Return 1 if the result overflows. See above for restrictions. */
|
||||
#if _GL_HAS_BUILTIN_ADD_OVERFLOW
|
||||
# define INT_ADD_WRAPV(a, b, r) __builtin_add_overflow (a, b, r)
|
||||
# define INT_SUBTRACT_WRAPV(a, b, r) __builtin_sub_overflow (a, b, r)
|
||||
#else
|
||||
# define INT_ADD_WRAPV(a, b, r) \
|
||||
_GL_INT_OP_WRAPV (a, b, r, +, _GL_INT_ADD_RANGE_OVERFLOW)
|
||||
# define INT_SUBTRACT_WRAPV(a, b, r) \
|
||||
_GL_INT_OP_WRAPV (a, b, r, -, _GL_INT_SUBTRACT_RANGE_OVERFLOW)
|
||||
#endif
|
||||
#if _GL_HAS_BUILTIN_MUL_OVERFLOW
|
||||
# if ((9 < __GNUC__ + (3 <= __GNUC_MINOR__) \
|
||||
|| (__GNUC__ == 8 && 4 <= __GNUC_MINOR__)) \
|
||||
&& !defined __ICC)
|
||||
# define INT_MULTIPLY_WRAPV(a, b, r) __builtin_mul_overflow (a, b, r)
|
||||
# else
|
||||
/* Work around GCC bug 91450. */
|
||||
# define INT_MULTIPLY_WRAPV(a, b, r) \
|
||||
((!_GL_SIGNED_TYPE_OR_EXPR (*(r)) && EXPR_SIGNED (a) && EXPR_SIGNED (b) \
|
||||
&& _GL_INT_MULTIPLY_RANGE_OVERFLOW (a, b, 0, (__typeof__ (*(r))) -1)) \
|
||||
? ((void) __builtin_mul_overflow (a, b, r), 1) \
|
||||
: __builtin_mul_overflow (a, b, r))
|
||||
# endif
|
||||
#else
|
||||
# define INT_MULTIPLY_WRAPV(a, b, r) \
|
||||
_GL_INT_OP_WRAPV (a, b, r, *, _GL_INT_MULTIPLY_RANGE_OVERFLOW)
|
||||
#endif
|
||||
|
||||
/* Nonzero if this compiler has GCC bug 68193 or Clang bug 25390. See:
|
||||
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68193
|
||||
https://llvm.org/bugs/show_bug.cgi?id=25390
|
||||
For now, assume all versions of GCC-like compilers generate bogus
|
||||
warnings for _Generic. This matters only for compilers that
|
||||
lack relevant builtins. */
|
||||
#if __GNUC__ || defined __clang__
|
||||
# define _GL__GENERIC_BOGUS 1
|
||||
#else
|
||||
# define _GL__GENERIC_BOGUS 0
|
||||
#endif
|
||||
|
||||
/* Store the low-order bits of A <op> B into *R, where OP specifies
|
||||
the operation and OVERFLOW the overflow predicate. Return 1 if the
|
||||
result overflows. See above for restrictions. */
|
||||
#if 201112 <= __STDC_VERSION__ && !_GL__GENERIC_BOGUS
|
||||
# define _GL_INT_OP_WRAPV(a, b, r, op, overflow) \
|
||||
(_Generic \
|
||||
(*(r), \
|
||||
signed char: \
|
||||
_GL_INT_OP_CALC (a, b, r, op, overflow, unsigned int, \
|
||||
signed char, SCHAR_MIN, SCHAR_MAX), \
|
||||
unsigned char: \
|
||||
_GL_INT_OP_CALC (a, b, r, op, overflow, unsigned int, \
|
||||
unsigned char, 0, UCHAR_MAX), \
|
||||
short int: \
|
||||
_GL_INT_OP_CALC (a, b, r, op, overflow, unsigned int, \
|
||||
short int, SHRT_MIN, SHRT_MAX), \
|
||||
unsigned short int: \
|
||||
_GL_INT_OP_CALC (a, b, r, op, overflow, unsigned int, \
|
||||
unsigned short int, 0, USHRT_MAX), \
|
||||
int: \
|
||||
_GL_INT_OP_CALC (a, b, r, op, overflow, unsigned int, \
|
||||
int, INT_MIN, INT_MAX), \
|
||||
unsigned int: \
|
||||
_GL_INT_OP_CALC (a, b, r, op, overflow, unsigned int, \
|
||||
unsigned int, 0, UINT_MAX), \
|
||||
long int: \
|
||||
_GL_INT_OP_CALC (a, b, r, op, overflow, unsigned long int, \
|
||||
long int, LONG_MIN, LONG_MAX), \
|
||||
unsigned long int: \
|
||||
_GL_INT_OP_CALC (a, b, r, op, overflow, unsigned long int, \
|
||||
unsigned long int, 0, ULONG_MAX), \
|
||||
long long int: \
|
||||
_GL_INT_OP_CALC (a, b, r, op, overflow, unsigned long long int, \
|
||||
long long int, LLONG_MIN, LLONG_MAX), \
|
||||
unsigned long long int: \
|
||||
_GL_INT_OP_CALC (a, b, r, op, overflow, unsigned long long int, \
|
||||
unsigned long long int, 0, ULLONG_MAX)))
|
||||
#else
|
||||
/* Store the low-order bits of A <op> B into *R, where OP specifies
|
||||
the operation and OVERFLOW the overflow predicate. If *R is
|
||||
signed, its type is ST with bounds SMIN..SMAX; otherwise its type
|
||||
is UT with bounds U..UMAX. ST and UT are narrower than int.
|
||||
Return 1 if the result overflows. See above for restrictions. */
|
||||
# if _GL_HAVE___TYPEOF__
|
||||
# define _GL_INT_OP_WRAPV_SMALLISH(a,b,r,op,overflow,st,smin,smax,ut,umax) \
|
||||
(TYPE_SIGNED (__typeof__ (*(r))) \
|
||||
? _GL_INT_OP_CALC (a, b, r, op, overflow, unsigned int, st, smin, smax) \
|
||||
: _GL_INT_OP_CALC (a, b, r, op, overflow, unsigned int, ut, 0, umax))
|
||||
# else
|
||||
# define _GL_INT_OP_WRAPV_SMALLISH(a,b,r,op,overflow,st,smin,smax,ut,umax) \
|
||||
(overflow (a, b, smin, smax) \
|
||||
? (overflow (a, b, 0, umax) \
|
||||
? (*(r) = _GL_INT_OP_WRAPV_VIA_UNSIGNED (a,b,op,unsigned,st), 1) \
|
||||
: (*(r) = _GL_INT_OP_WRAPV_VIA_UNSIGNED (a,b,op,unsigned,st)) < 0) \
|
||||
: (overflow (a, b, 0, umax) \
|
||||
? (*(r) = _GL_INT_OP_WRAPV_VIA_UNSIGNED (a,b,op,unsigned,st)) >= 0 \
|
||||
: (*(r) = _GL_INT_OP_WRAPV_VIA_UNSIGNED (a,b,op,unsigned,st), 0)))
|
||||
# endif
|
||||
|
||||
# define _GL_INT_OP_WRAPV(a, b, r, op, overflow) \
|
||||
(sizeof *(r) == sizeof (signed char) \
|
||||
? _GL_INT_OP_WRAPV_SMALLISH (a, b, r, op, overflow, \
|
||||
signed char, SCHAR_MIN, SCHAR_MAX, \
|
||||
unsigned char, UCHAR_MAX) \
|
||||
: sizeof *(r) == sizeof (short int) \
|
||||
? _GL_INT_OP_WRAPV_SMALLISH (a, b, r, op, overflow, \
|
||||
short int, SHRT_MIN, SHRT_MAX, \
|
||||
unsigned short int, USHRT_MAX) \
|
||||
: sizeof *(r) == sizeof (int) \
|
||||
? (EXPR_SIGNED (*(r)) \
|
||||
? _GL_INT_OP_CALC (a, b, r, op, overflow, unsigned int, \
|
||||
int, INT_MIN, INT_MAX) \
|
||||
: _GL_INT_OP_CALC (a, b, r, op, overflow, unsigned int, \
|
||||
unsigned int, 0, UINT_MAX)) \
|
||||
: _GL_INT_OP_WRAPV_LONGISH(a, b, r, op, overflow))
|
||||
# ifdef LLONG_MAX
|
||||
# define _GL_INT_OP_WRAPV_LONGISH(a, b, r, op, overflow) \
|
||||
(sizeof *(r) == sizeof (long int) \
|
||||
? (EXPR_SIGNED (*(r)) \
|
||||
? _GL_INT_OP_CALC (a, b, r, op, overflow, unsigned long int, \
|
||||
long int, LONG_MIN, LONG_MAX) \
|
||||
: _GL_INT_OP_CALC (a, b, r, op, overflow, unsigned long int, \
|
||||
unsigned long int, 0, ULONG_MAX)) \
|
||||
: (EXPR_SIGNED (*(r)) \
|
||||
? _GL_INT_OP_CALC (a, b, r, op, overflow, unsigned long long int, \
|
||||
long long int, LLONG_MIN, LLONG_MAX) \
|
||||
: _GL_INT_OP_CALC (a, b, r, op, overflow, unsigned long long int, \
|
||||
unsigned long long int, 0, ULLONG_MAX)))
|
||||
# else
|
||||
# define _GL_INT_OP_WRAPV_LONGISH(a, b, r, op, overflow) \
|
||||
(EXPR_SIGNED (*(r)) \
|
||||
? _GL_INT_OP_CALC (a, b, r, op, overflow, unsigned long int, \
|
||||
long int, LONG_MIN, LONG_MAX) \
|
||||
: _GL_INT_OP_CALC (a, b, r, op, overflow, unsigned long int, \
|
||||
unsigned long int, 0, ULONG_MAX))
|
||||
# endif
|
||||
#endif
|
||||
|
||||
/* Store the low-order bits of A <op> B into *R, where the operation
|
||||
is given by OP. Use the unsigned type UT for calculation to avoid
|
||||
overflow problems. *R's type is T, with extrema TMIN and TMAX.
|
||||
T must be a signed integer type. Return 1 if the result overflows. */
|
||||
#define _GL_INT_OP_CALC(a, b, r, op, overflow, ut, t, tmin, tmax) \
|
||||
(overflow (a, b, tmin, tmax) \
|
||||
? (*(r) = _GL_INT_OP_WRAPV_VIA_UNSIGNED (a, b, op, ut, t), 1) \
|
||||
: (*(r) = _GL_INT_OP_WRAPV_VIA_UNSIGNED (a, b, op, ut, t), 0))
|
||||
|
||||
/* Return the low-order bits of A <op> B, where the operation is given
|
||||
by OP. Use the unsigned type UT for calculation to avoid undefined
|
||||
behavior on signed integer overflow, and convert the result to type T.
|
||||
UT is at least as wide as T and is no narrower than unsigned int,
|
||||
T is two's complement, and there is no padding or trap representations.
|
||||
Assume that converting UT to T yields the low-order bits, as is
|
||||
done in all known two's-complement C compilers. E.g., see:
|
||||
https://gcc.gnu.org/onlinedocs/gcc/Integers-implementation.html
|
||||
|
||||
According to the C standard, converting UT to T yields an
|
||||
implementation-defined result or signal for values outside T's
|
||||
range. However, code that works around this theoretical problem
|
||||
runs afoul of a compiler bug in Oracle Studio 12.3 x86. See:
|
||||
https://lists.gnu.org/r/bug-gnulib/2017-04/msg00049.html
|
||||
As the compiler bug is real, don't try to work around the
|
||||
theoretical problem. */
|
||||
|
||||
#define _GL_INT_OP_WRAPV_VIA_UNSIGNED(a, b, op, ut, t) \
|
||||
((t) ((ut) (a) op (ut) (b)))
|
||||
|
||||
/* Return true if the numeric values A + B, A - B, A * B fall outside
|
||||
the range TMIN..TMAX. Arguments should be integer expressions
|
||||
without side effects. TMIN should be signed and nonpositive.
|
||||
TMAX should be positive, and should be signed unless TMIN is zero. */
|
||||
#define _GL_INT_ADD_RANGE_OVERFLOW(a, b, tmin, tmax) \
|
||||
((b) < 0 \
|
||||
? (((tmin) \
|
||||
? ((EXPR_SIGNED (_GL_INT_CONVERT (a, (tmin) - (b))) || (b) < (tmin)) \
|
||||
&& (a) < (tmin) - (b)) \
|
||||
: (a) <= -1 - (b)) \
|
||||
|| ((EXPR_SIGNED (a) ? 0 <= (a) : (tmax) < (a)) && (tmax) < (a) + (b))) \
|
||||
: (a) < 0 \
|
||||
? (((tmin) \
|
||||
? ((EXPR_SIGNED (_GL_INT_CONVERT (b, (tmin) - (a))) || (a) < (tmin)) \
|
||||
&& (b) < (tmin) - (a)) \
|
||||
: (b) <= -1 - (a)) \
|
||||
|| ((EXPR_SIGNED (_GL_INT_CONVERT (a, b)) || (tmax) < (b)) \
|
||||
&& (tmax) < (a) + (b))) \
|
||||
: (tmax) < (b) || (tmax) - (b) < (a))
|
||||
#define _GL_INT_SUBTRACT_RANGE_OVERFLOW(a, b, tmin, tmax) \
|
||||
(((a) < 0) == ((b) < 0) \
|
||||
? ((a) < (b) \
|
||||
? !(tmin) || -1 - (tmin) < (b) - (a) - 1 \
|
||||
: (tmax) < (a) - (b)) \
|
||||
: (a) < 0 \
|
||||
? ((!EXPR_SIGNED (_GL_INT_CONVERT ((a) - (tmin), b)) && (a) - (tmin) < 0) \
|
||||
|| (a) - (tmin) < (b)) \
|
||||
: ((! (EXPR_SIGNED (_GL_INT_CONVERT (tmax, b)) \
|
||||
&& EXPR_SIGNED (_GL_INT_CONVERT ((tmax) + (b), a))) \
|
||||
&& (tmax) <= -1 - (b)) \
|
||||
|| (tmax) + (b) < (a)))
|
||||
#define _GL_INT_MULTIPLY_RANGE_OVERFLOW(a, b, tmin, tmax) \
|
||||
((b) < 0 \
|
||||
? ((a) < 0 \
|
||||
? (EXPR_SIGNED (_GL_INT_CONVERT (tmax, b)) \
|
||||
? (a) < (tmax) / (b) \
|
||||
: ((INT_NEGATE_OVERFLOW (b) \
|
||||
? _GL_INT_CONVERT (b, tmax) >> (TYPE_WIDTH (+ (b)) - 1) \
|
||||
: (tmax) / -(b)) \
|
||||
<= -1 - (a))) \
|
||||
: INT_NEGATE_OVERFLOW (_GL_INT_CONVERT (b, tmin)) && (b) == -1 \
|
||||
? (EXPR_SIGNED (a) \
|
||||
? 0 < (a) + (tmin) \
|
||||
: 0 < (a) && -1 - (tmin) < (a) - 1) \
|
||||
: (tmin) / (b) < (a)) \
|
||||
: (b) == 0 \
|
||||
? 0 \
|
||||
: ((a) < 0 \
|
||||
? (INT_NEGATE_OVERFLOW (_GL_INT_CONVERT (a, tmin)) && (a) == -1 \
|
||||
? (EXPR_SIGNED (b) ? 0 < (b) + (tmin) : -1 - (tmin) < (b) - 1) \
|
||||
: (tmin) / (a) < (b)) \
|
||||
: (tmax) / (b) < (a)))
|
||||
#define INT_ADD_WRAPV(a, b, r) _GL_INT_ADD_WRAPV (a, b, r)
|
||||
#define INT_SUBTRACT_WRAPV(a, b, r) _GL_INT_SUBTRACT_WRAPV (a, b, r)
|
||||
#define INT_MULTIPLY_WRAPV(a, b, r) _GL_INT_MULTIPLY_WRAPV (a, b, r)
|
||||
|
||||
/* The following macros compute A + B, A - B, and A * B, respectively.
|
||||
If no overflow occurs, they set *R to the result and return 1;
|
||||
@@ -621,6 +323,8 @@
|
||||
|
||||
A, B, and *R should be integers; they need not be the same type,
|
||||
and they need not be all signed or all unsigned.
|
||||
However, none of the integer types should be bit-precise,
|
||||
and *R's type should not be char, bool, or an enumeration type.
|
||||
|
||||
These macros work correctly on all known practical hosts, and do not rely
|
||||
on undefined behavior due to signed arithmetic overflow.
|
||||
@@ -632,8 +336,8 @@
|
||||
|
||||
These macros are tuned for B being a constant. */
|
||||
|
||||
#define INT_ADD_OK(a, b, r) ! INT_ADD_WRAPV (a, b, r)
|
||||
#define INT_SUBTRACT_OK(a, b, r) ! INT_SUBTRACT_WRAPV (a, b, r)
|
||||
#define INT_MULTIPLY_OK(a, b, r) ! INT_MULTIPLY_WRAPV (a, b, r)
|
||||
#define INT_ADD_OK(a, b, r) (! INT_ADD_WRAPV (a, b, r))
|
||||
#define INT_SUBTRACT_OK(a, b, r) (! INT_SUBTRACT_WRAPV (a, b, r))
|
||||
#define INT_MULTIPLY_OK(a, b, r) (! INT_MULTIPLY_WRAPV (a, b, r))
|
||||
|
||||
#endif /* _GL_INTPROPS_H */
|
||||
|
||||
Reference in New Issue
Block a user