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e077349ce5
* assert/assert.h (assert): Rewrite assert's definition so that
a s/==/=/ typo, e.g., assert(errno = ENOENT) is not hidden from
gcc's -Wparentheses by assert-added parentheses. The new definition
uses "if (expr) /* empty */; else __assert_fail...", so
gcc -Wall will now detect that type of error in an assert, too.
The __STRICT_ANSI__ disjunct is to make this work also with both
-ansi and -pedantic, which would reject the use of ({...}).
I would have preferred to use __extension__ to mark that, but
doing so would mistakenly suppress warnings about any extension
in the user-supplied "expr".
E.g., "assert ( ({1;}) )" must continue to evoke a warning.
132 lines
3.9 KiB
C
132 lines
3.9 KiB
C
/* Copyright (C) 1991-2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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/*
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* ISO C99 Standard: 7.2 Diagnostics <assert.h>
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*/
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#ifdef _ASSERT_H
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# undef _ASSERT_H
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# undef assert
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# undef __ASSERT_VOID_CAST
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# ifdef __USE_GNU
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# undef assert_perror
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# endif
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#endif /* assert.h */
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#define _ASSERT_H 1
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#include <features.h>
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#if defined __cplusplus && __GNUC_PREREQ (2,95)
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# define __ASSERT_VOID_CAST static_cast<void>
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#else
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# define __ASSERT_VOID_CAST (void)
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#endif
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/* void assert (int expression);
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If NDEBUG is defined, do nothing.
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If not, and EXPRESSION is zero, print an error message and abort. */
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#ifdef NDEBUG
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# define assert(expr) (__ASSERT_VOID_CAST (0))
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/* void assert_perror (int errnum);
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If NDEBUG is defined, do nothing. If not, and ERRNUM is not zero, print an
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error message with the error text for ERRNUM and abort.
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(This is a GNU extension.) */
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# ifdef __USE_GNU
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# define assert_perror(errnum) (__ASSERT_VOID_CAST (0))
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# endif
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#else /* Not NDEBUG. */
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__BEGIN_DECLS
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/* This prints an "Assertion failed" message and aborts. */
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extern void __assert_fail (const char *__assertion, const char *__file,
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unsigned int __line, const char *__function)
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__THROW __attribute__ ((__noreturn__));
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/* Likewise, but prints the error text for ERRNUM. */
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extern void __assert_perror_fail (int __errnum, const char *__file,
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unsigned int __line, const char *__function)
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__THROW __attribute__ ((__noreturn__));
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/* The following is not at all used here but needed for standard
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compliance. */
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extern void __assert (const char *__assertion, const char *__file, int __line)
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__THROW __attribute__ ((__noreturn__));
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__END_DECLS
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/* When possible, define assert so that it does not add extra
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parentheses around EXPR. Otherwise, those added parentheses would
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suppress warnings we'd expect to be detected by gcc's -Wparentheses. */
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# if !defined __GNUC__ || defined __STRICT_ANSI__
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# define assert(expr) \
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((expr) \
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? __ASSERT_VOID_CAST (0) \
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: __assert_fail (#expr, __FILE__, __LINE__, __ASSERT_FUNCTION))
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# else
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# define assert(expr) \
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({ \
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if (expr) \
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; /* empty */ \
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else \
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__assert_fail (#expr, __FILE__, __LINE__, __ASSERT_FUNCTION); \
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})
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# endif
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# ifdef __USE_GNU
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# define assert_perror(errnum) \
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(!(errnum) \
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? __ASSERT_VOID_CAST (0) \
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: __assert_perror_fail ((errnum), __FILE__, __LINE__, __ASSERT_FUNCTION))
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# endif
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/* Version 2.4 and later of GCC define a magical variable `__PRETTY_FUNCTION__'
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which contains the name of the function currently being defined.
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This is broken in G++ before version 2.6.
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C9x has a similar variable called __func__, but prefer the GCC one since
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it demangles C++ function names. */
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# if defined __cplusplus ? __GNUC_PREREQ (2, 6) : __GNUC_PREREQ (2, 4)
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# define __ASSERT_FUNCTION __PRETTY_FUNCTION__
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# else
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# if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L
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# define __ASSERT_FUNCTION __func__
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# else
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# define __ASSERT_FUNCTION ((const char *) 0)
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# endif
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# endif
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#endif /* NDEBUG. */
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#if defined __USE_ISOC11 && !defined __cplusplus
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# undef static_assert
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# define static_assert _Static_assert
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#endif
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