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New upstream version 2.3.4

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Jan Wagner 2023-10-18 07:29:37 +00:00
parent e7bdd1c6c6
commit de72f6f588
556 changed files with 90432 additions and 53391 deletions
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191
gl/verify.h
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@ -1,19 +1,19 @@
/* Compile-time assert-like macros.
Copyright (C) 2005-2006, 2009-2013 Free Software Foundation, Inc.
Copyright (C) 2005-2006, 2009-2023 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This file 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,
This file 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 General Public License for more details.
GNU Lesser General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
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/>. */
/* Written by Paul Eggert, Bruno Haible, and Jim Meyering. */
@ -21,31 +21,32 @@
#define _GL_VERIFY_H
/* Define _GL_HAVE__STATIC_ASSERT to 1 if _Static_assert works as per C11.
This is supported by GCC 4.6.0 and later, in C mode, and its use
here generates easier-to-read diagnostics when verify (R) fails.
/* Define _GL_HAVE__STATIC_ASSERT to 1 if _Static_assert (R, DIAGNOSTIC)
works as per C11. This is supported by GCC 4.6.0+ and by clang 4+.
Define _GL_HAVE_STATIC_ASSERT to 1 if static_assert works as per C++11.
This will likely be supported by future GCC versions, in C++ mode.
Define _GL_HAVE__STATIC_ASSERT1 to 1 if _Static_assert (R) works as
per C23. This is supported by GCC 9.1+.
Use this only with GCC. If we were willing to slow 'configure'
down we could also use it with other compilers, but since this
affects only the quality of diagnostics, why bother? */
#if (4 < __GNUC__ + (6 <= __GNUC_MINOR__) \
&& (201112L <= __STDC_VERSION__ || !defined __STRICT_ANSI__) \
&& !defined __cplusplus)
# define _GL_HAVE__STATIC_ASSERT 1
#endif
/* The condition (99 < __GNUC__) is temporary, until we know about the
first G++ release that supports static_assert. */
#if (99 < __GNUC__) && defined __cplusplus
# define _GL_HAVE_STATIC_ASSERT 1
Support compilers claiming conformance to the relevant standard,
and also support GCC when not pedantic. If we were willing to slow
'configure' down we could also use it with other compilers, but
since this affects only the quality of diagnostics, why bother? */
#ifndef __cplusplus
# if (201112 <= __STDC_VERSION__ \
|| (!defined __STRICT_ANSI__ \
&& (4 < __GNUC__ + (6 <= __GNUC_MINOR__) || 5 <= __clang_major__)))
# define _GL_HAVE__STATIC_ASSERT 1
# endif
# if (202311 <= __STDC_VERSION__ \
|| (!defined __STRICT_ANSI__ && 9 <= __GNUC__))
# define _GL_HAVE__STATIC_ASSERT1 1
# endif
#endif
/* FreeBSD 9.1 <sys/cdefs.h>, included by <stddef.h> and lots of other
system headers, defines a conflicting _Static_assert that is no
better than ours; override it. */
#ifndef _GL_HAVE_STATIC_ASSERT
#ifndef _GL_HAVE__STATIC_ASSERT
# include <stddef.h>
# undef _Static_assert
#endif
@ -143,9 +144,9 @@
which do not support _Static_assert, also do not warn about the
last declaration mentioned above.
* GCC warns if -Wnested-externs is enabled and verify() is used
* GCC warns if -Wnested-externs is enabled and 'verify' is used
within a function body; but inside a function, you can always
arrange to use verify_expr() instead.
arrange to use verify_expr instead.
* In C++, any struct definition inside sizeof is invalid.
Use a template type to work around the problem. */
@ -197,48 +198,95 @@ template <int w>
#endif
/* Verify requirement R at compile-time, as a declaration without a
trailing ';'. If R is false, fail at compile-time, preferably
with a diagnostic that includes the string-literal DIAGNOSTIC.
trailing ';'. If R is false, fail at compile-time.
This macro requires three or more arguments but uses at most the first
two, so that the _Static_assert macro optionally defined below supports
both the C11 two-argument syntax and the C23 one-argument syntax.
Unfortunately, unlike C11, this implementation must appear as an
ordinary declaration, and cannot appear inside struct { ... }. */
#ifdef _GL_HAVE__STATIC_ASSERT
# define _GL_VERIFY _Static_assert
#if 202311 <= __STDC_VERSION__ || 200410 <= __cpp_static_assert
# define _GL_VERIFY(R, DIAGNOSTIC, ...) static_assert (R, DIAGNOSTIC)
#elif defined _GL_HAVE__STATIC_ASSERT
# define _GL_VERIFY(R, DIAGNOSTIC, ...) _Static_assert (R, DIAGNOSTIC)
#else
# define _GL_VERIFY(R, DIAGNOSTIC) \
# define _GL_VERIFY(R, DIAGNOSTIC, ...) \
extern int (*_GL_GENSYM (_gl_verify_function) (void)) \
[_GL_VERIFY_TRUE (R, DIAGNOSTIC)]
# if 4 < __GNUC__ + (6 <= __GNUC_MINOR__)
# pragma GCC diagnostic ignored "-Wnested-externs"
# endif
#endif
/* _GL_STATIC_ASSERT_H is defined if this code is copied into assert.h. */
#ifdef _GL_STATIC_ASSERT_H
# if !defined _GL_HAVE__STATIC_ASSERT && !defined _Static_assert
# define _Static_assert(R, DIAGNOSTIC) _GL_VERIFY (R, DIAGNOSTIC)
# if !defined _GL_HAVE__STATIC_ASSERT1 && !defined _Static_assert
# if !defined _MSC_VER || defined __clang__
# define _Static_assert(...) \
_GL_VERIFY (__VA_ARGS__, "static assertion failed", -)
# else
/* Work around MSVC preprocessor incompatibility with ISO C; see
<https://stackoverflow.com/questions/5134523/>. */
# define _Static_assert(R, ...) \
_GL_VERIFY ((R), "static assertion failed", -)
# endif
# endif
# if !defined _GL_HAVE_STATIC_ASSERT && !defined static_assert
# define static_assert _Static_assert /* C11 requires this #define. */
# if (!defined static_assert \
&& __STDC_VERSION__ < 202311 \
&& (!defined __cplusplus \
|| (__cpp_static_assert < 201411 \
&& __GNUG__ < 6 && __clang_major__ < 6)))
# if defined __cplusplus && _MSC_VER >= 1900 && !defined __clang__
/* MSVC 14 in C++ mode supports the two-arguments static_assert but not
the one-argument static_assert, and it does not support _Static_assert.
We have to play preprocessor tricks to distinguish the two cases.
Since the MSVC preprocessor is not ISO C compliant (see above),.
the solution is specific to MSVC. */
# define _GL_EXPAND(x) x
# define _GL_SA1(a1) static_assert ((a1), "static assertion failed")
# define _GL_SA2 static_assert
# define _GL_SA3 static_assert
# define _GL_SA_PICK(x1,x2,x3,x4,...) x4
# define static_assert(...) _GL_EXPAND(_GL_SA_PICK(__VA_ARGS__,_GL_SA3,_GL_SA2,_GL_SA1)) (__VA_ARGS__)
# else
# define static_assert _Static_assert /* C11 requires this #define. */
# endif
# endif
#endif
/* @assert.h omit start@ */
#if defined __clang_major__ && __clang_major__ < 5
# define _GL_HAS_BUILTIN_TRAP 0
#elif 3 < __GNUC__ + (3 < __GNUC_MINOR__ + (4 <= __GNUC_PATCHLEVEL__))
# define _GL_HAS_BUILTIN_TRAP 1
#elif defined __has_builtin
# define _GL_HAS_BUILTIN_TRAP __has_builtin (__builtin_trap)
#else
# define _GL_HAS_BUILTIN_TRAP 0
#endif
#if defined __clang_major__ && __clang_major__ < 5
# define _GL_HAS_BUILTIN_UNREACHABLE 0
#elif 4 < __GNUC__ + (5 <= __GNUC_MINOR__)
# define _GL_HAS_BUILTIN_UNREACHABLE 1
#elif defined __has_builtin
# define _GL_HAS_BUILTIN_UNREACHABLE __has_builtin (__builtin_unreachable)
#else
# define _GL_HAS_BUILTIN_UNREACHABLE 0
#endif
/* Each of these macros verifies that its argument R is nonzero. To
be portable, R should be an integer constant expression. Unlike
assert (R), there is no run-time overhead.
There are two macros, since no single macro can be used in all
contexts in C. verify_true (R) is for scalar contexts, including
contexts in C. verify_expr (R, E) is for scalar contexts, including
integer constant expression contexts. verify (R) is for declaration
contexts, e.g., the top level. */
/* Verify requirement R at compile-time, as an integer constant expression.
Return 1. This is equivalent to verify_expr (R, 1).
verify_true is obsolescent; please use verify_expr instead. */
#define verify_true(R) _GL_VERIFY_TRUE (R, "verify_true (" #R ")")
/* Verify requirement R at compile-time. Return the value of the
expression E. */
@ -246,9 +294,56 @@ template <int w>
(_GL_VERIFY_TRUE (R, "verify_expr (" #R ", " #E ")") ? (E) : (E))
/* Verify requirement R at compile-time, as a declaration without a
trailing ';'. */
trailing ';'. verify (R) acts like static_assert (R) except that
it is portable to C11/C++14 and earlier, it can issue better
diagnostics, and its name is shorter and may be more convenient. */
#define verify(R) _GL_VERIFY (R, "verify (" #R ")")
#ifdef __PGI
/* PGI barfs if R is long. */
# define verify(R) _GL_VERIFY (R, "verify (...)", -)
#else
# define verify(R) _GL_VERIFY (R, "verify (" #R ")", -)
#endif
/* Assume that R always holds. Behavior is undefined if R is false,
fails to evaluate, or has side effects.
'assume (R)' is a directive from the programmer telling the
compiler that R is true so the compiler needn't generate code to
test R. This is why 'assume' is in verify.h: it's related to
static checking (in this case, static checking done by the
programmer), not dynamic checking.
'assume (R)' can affect compilation of all the code, not just code
that happens to be executed after the assume (R) is "executed".
For example, if the code mistakenly does 'assert (R); assume (R);'
the compiler is entitled to optimize away the 'assert (R)'.
Although assuming R can help a compiler generate better code or
diagnostics, performance can suffer if R uses hard-to-optimize
features such as function calls not inlined by the compiler.
Avoid Clang's __builtin_assume, as it breaks GNU Emacs master
as of 2020-08-23T21:09:49Z!eggert@cs.ucla.edu; see
<https://bugs.gnu.org/43152#71>. It's not known whether this breakage
is a Clang bug or an Emacs bug; play it safe for now. */
#if _GL_HAS_BUILTIN_UNREACHABLE
# define assume(R) ((R) ? (void) 0 : __builtin_unreachable ())
#elif 1200 <= _MSC_VER
# define assume(R) __assume (R)
#elif 202311 <= __STDC_VERSION__
# include <stddef.h>
# define assume(R) ((R) ? (void) 0 : unreachable ())
#elif (defined GCC_LINT || defined lint) && _GL_HAS_BUILTIN_TRAP
/* Doing it this way helps various packages when configured with
--enable-gcc-warnings, which compiles with -Dlint. It's nicer
if 'assume' silences warnings with GCC 3.4 through GCC 4.4.7 (2012). */
# define assume(R) ((R) ? (void) 0 : __builtin_trap ())
#else
/* Some older tools grok NOTREACHED, e.g., Oracle Studio 12.6 (2017). */
# define assume(R) ((R) ? (void) 0 : /*NOTREACHED*/ (void) 0)
#endif
/* @assert.h omit end@ */