* lib/intprops.h: Include new file intprops-internal.h.
(_GL_INT_CONVERT, _GL_INT_NEGATE_CONVERT, _GL_INT_MINIMUM)
(_GL_INT_MAXIMUM, _GL_SIGNED_INT_MAXIMUM, LLONG_MAX, LLONG_MIN)
(_GL_HAVE___TYPEOF__, _GL_SIGNED_TYPE_OR_EXPR)
(_GL_HAS_BUILTIN_ADD_OVERFLOW, _GL_HAS_BUILTIN_MUL_OVERFLOW)
(_GL_HAS_BUILTIN_OVERFLOW_P, _GL__GENERIC_BOGUS)
(_GL_INT_OP_WRAPV, _GL_INT_OP_WRAPV_LONGISH, _GL_INT_OP_CALC)
(_GL_INT_OP_WRAPV_VIA_UNSIGNED, _GL_INT_ADD_RANGE_OVERFLOW)
(_GL_INT_SUBTRACT_RANGE_OVERFLOW)
(_GL_INT_MULTIPLY_RANGE_OVERFLOW):
Move to intprops-internal.h.
(TYPE_SIGNED, EXPR_SIGNED, TYPE_WIDTH, INT_NEGATE_RANGE_OVERFLOW)
(INT_NEGATE_OVERFLOW, INT_ADD_WRAPV, INT_SUBTRACT_WRAPV)
(INT_MULTIPLY_WRAPV): Rename to _GL_ prefix, move to
intprops-internal.h, and define here in terms of the _GL_ name.
* lib/intprops-internal.h: New file, containing the above.
* modules/intprops (Files): Add lib/intprops-internal.h.
2022-08-09 Paul Eggert <eggert@cs.ucla.edu>
+ intprops: refactor intprops.h into two
+ * lib/intprops.h: Include new file intprops-internal.h.
+ (_GL_INT_CONVERT, _GL_INT_NEGATE_CONVERT, _GL_INT_MINIMUM)
+ (_GL_INT_MAXIMUM, _GL_SIGNED_INT_MAXIMUM, LLONG_MAX, LLONG_MIN)
+ (_GL_HAVE___TYPEOF__, _GL_SIGNED_TYPE_OR_EXPR)
+ (_GL_HAS_BUILTIN_ADD_OVERFLOW, _GL_HAS_BUILTIN_MUL_OVERFLOW)
+ (_GL_HAS_BUILTIN_OVERFLOW_P, _GL__GENERIC_BOGUS)
+ (_GL_INT_OP_WRAPV, _GL_INT_OP_WRAPV_LONGISH, _GL_INT_OP_CALC)
+ (_GL_INT_OP_WRAPV_VIA_UNSIGNED, _GL_INT_ADD_RANGE_OVERFLOW)
+ (_GL_INT_SUBTRACT_RANGE_OVERFLOW)
+ (_GL_INT_MULTIPLY_RANGE_OVERFLOW):
+ Move to intprops-internal.h.
+ (TYPE_SIGNED, EXPR_SIGNED, TYPE_WIDTH, INT_NEGATE_RANGE_OVERFLOW)
+ (INT_NEGATE_OVERFLOW, INT_ADD_WRAPV, INT_SUBTRACT_WRAPV)
+ (INT_MULTIPLY_WRAPV): Rename to _GL_ prefix, move to
+ intprops-internal.h, and define here in terms of the _GL_ name.
+ * lib/intprops-internal.h: New file, containing the above.
+ * modules/intprops (Files): Add lib/intprops-internal.h.
+
intprops: refactor _GL_HAS_BUILTIN_OVERFLOW_P
* lib/intprops.h (_GL_HAS_BUILTIN_OVERFLOW_P)
[_GL_HAS_BUILTIN_OVERFLOW_P]: Use __builtin_sub_overflow_p
--- /dev/null
+/* intprops-internal.h -- properties of integer types not visible to users
+
+ Copyright (C) 2001-2022 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>
+
+/* 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))
+
+/* 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_NEGATE_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_NEGATE_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 (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) _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.
+ Arguments should not have side effects, and A's type should have
+ 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/bugzilla/show_bug.cgi?id=98269>. */
+#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
+
+/* 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 _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)
+#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 __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, 0, (__typeof__ (*(r))) -1)) \
+ ? ((void) __builtin_mul_overflow (a, b, r), 1) \
+ : __builtin_mul_overflow (a, b, r))
+# endif
+#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/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) \
+ (_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 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 1 if the integer expressions A - B and -A would overflow,
+ respectively. Arguments should not have side effects.
+ 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 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) \
+ ? ((_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 */
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. */
#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)
/* 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 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))
? (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. */
/* 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
? (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. */
-#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/bugzilla/show_bug.cgi?id=98269>. */
-#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
-
/* 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
_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) \
- __builtin_sub_overflow_p (0, a, (__typeof__ (- (a))) 0)
-#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) \
/* 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 __EDG__)
-# 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;
Files:
lib/intprops.h
+lib/intprops-internal.h
Depends-on: