/* System-dependent definitions for Bison.
- Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2009
- Free Software Foundation, Inc.
+ Copyright (C) 2000-2007, 2009-2012 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
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#ifndef BISON_SYSTEM_H
-#define BISON_SYSTEM_H
+# define BISON_SYSTEM_H
/* flex 2.5.31 gratutiously defines macros like INT8_MIN. But this
runs afoul of pre-C99 compilers that have <inttypes.h> or
<stdint.h>, which are included below if available. It also runs
afoul of pre-C99 compilers that define these macros in <limits.h>. */
-#if ! defined __STDC_VERSION__ || __STDC_VERSION__ < 199901
-# undef INT8_MIN
-# undef INT16_MIN
-# undef INT32_MIN
-# undef INT8_MAX
-# undef INT16_MAX
-# undef UINT8_MAX
-# undef INT32_MAX
-# undef UINT16_MAX
-# undef UINT32_MAX
-#endif
-
-#include <limits.h>
-#include <stddef.h>
-#include <stdlib.h>
-#include <string.h>
-
-#if HAVE_SYS_TYPES_H
-# include <sys/types.h>
-#endif
-
-#include <unistd.h>
-#include <inttypes.h>
-
-#ifndef UINTPTR_MAX
+# if ! defined __STDC_VERSION__ || __STDC_VERSION__ < 199901
+# undef INT8_MIN
+# undef INT16_MIN
+# undef INT32_MIN
+# undef INT8_MAX
+# undef INT16_MAX
+# undef UINT8_MAX
+# undef INT32_MAX
+# undef UINT16_MAX
+# undef UINT32_MAX
+# endif
+
+# include <limits.h>
+# include <stddef.h>
+# include <stdlib.h>
+# include <string.h>
+
+# if HAVE_SYS_TYPES_H
+# include <sys/types.h>
+# endif
+
+# include <unistd.h>
+# include <inttypes.h>
+
+# ifndef UINTPTR_MAX
/* This isn't perfect, but it's good enough for Bison, which needs
only to hash pointers. */
typedef size_t uintptr_t;
-#endif
+# endif
+// Version mismatch.
+# define EX_MISMATCH 63
/*---------.
| Gnulib. |
`---------*/
-#include <unlocked-io.h>
-#include <verify.h>
-#include <xalloc.h>
+# include <unlocked-io.h>
+# include <verify.h>
+# include <xalloc.h>
/*-----------------.
| GCC extensions. |
`-----------------*/
-/* Use this to suppress gcc's `...may be used before initialized'
- warnings. */
-#ifdef lint
-# define IF_LINT(Code) Code
-#else
-# define IF_LINT(Code) /* empty */
-#endif
-
-#ifndef __attribute__
+/* Use PACIFY_CC to indicate that Code is unimportant to the logic of Bison
+ but that it is necessary for suppressing compiler warnings. For example,
+ Code might be a variable initializer that's always overwritten before the
+ variable is used.
+
+ PACIFY_CC is intended to be useful only as a comment as it does not alter
+ Code. It is tempting to redefine PACIFY_CC so that it will suppress Code
+ when configuring without --enable-gcc-warnings. However, that would mean
+ that, for maintainers, Bison would compile with potentially less warnings
+ and safer logic than it would for users. Due to the overhead of M4,
+ suppressing Code is unlikely to offer any significant improvement in
+ Bison's performance anyway. */
+# define PACIFY_CC(Code) Code
+
+# ifndef __attribute__
/* This feature is available in gcc versions 2.5 and later. */
-# if (! defined __GNUC__ || __GNUC__ < 2 \
- || (__GNUC__ == 2 && __GNUC_MINOR__ < 5) || __STRICT_ANSI__)
-# define __attribute__(Spec) /* empty */
+# if (! defined __GNUC__ || __GNUC__ < 2 \
+ || (__GNUC__ == 2 && __GNUC_MINOR__ < 5))
+# define __attribute__(Spec) /* empty */
+# endif
# endif
-#endif
/* The __-protected variants of `format' and `printf' attributes
are accepted by gcc versions 2.6.4 (effectively 2.7) and later. */
-#if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 7)
-# define __format__ format
-# define __printf__ printf
-#endif
+# if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 7)
+# define __format__ format
+# define __printf__ printf
+# endif
-#ifndef ATTRIBUTE_NORETURN
-# define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__))
-#endif
+# ifndef ATTRIBUTE_NORETURN
+# define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__))
+# endif
-#ifndef ATTRIBUTE_UNUSED
-# define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
-#endif
+# ifndef ATTRIBUTE_UNUSED
+# define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
+# endif
-#define FUNCTION_PRINT() fprintf (stderr, "%s: ", __func__)
+# define FUNCTION_PRINT() fprintf (stderr, "%s: ", __func__)
/*------.
| NLS. |
`------*/
-#include <locale.h>
+# include <locale.h>
-#include <gettext.h>
-#define _(Msgid) gettext (Msgid)
-#define N_(Msgid) (Msgid)
+# include <gettext.h>
+# define _(Msgid) gettext (Msgid)
+# define N_(Msgid) (Msgid)
/*-----------.
| Booleans. |
`-----------*/
-#include <stdbool.h>
+# include <stdbool.h>
| Assertions. |
`-------------*/
-/* <assert.h>'s assertions are too heavyweight, and can be disabled
- too easily, so use aver rather than assert. */
-static inline void
-aver (bool assertion)
-{
- if (! assertion)
- abort ();
-}
+/* In the past, Bison defined aver to simply invoke abort in the case of
+ a failed assertion. The rationale was that <assert.h>'s assertions
+ were too heavyweight and could be disabled too easily. See
+ discussions at
+ <http://lists.gnu.org/archive/html/bison-patches/2006-01/msg00080.html>
+ <http://lists.gnu.org/archive/html/bison-patches/2006-09/msg00111.html>.
+
+ However, normal assert output can be helpful during development and
+ in bug reports from users. Moreover, it's not clear now that
+ <assert.h>'s assertions are significantly heavyweight. Finally, if
+ users want to experiment with disabling assertions, it's debatable
+ whether it's our responsibility to stop them. See discussion
+ starting at
+ <http://lists.gnu.org/archive/html/bison-patches/2009-09/msg00013.html>.
+
+ For now, we use assert but we call it aver throughout Bison in case
+ we later wish to try another scheme.
+*/
+# include <assert.h>
+# define aver assert
/*-----------.
| Obstacks. |
`-----------*/
-#define obstack_chunk_alloc xmalloc
-#define obstack_chunk_free free
-#include <obstack.h>
+# define obstack_chunk_alloc xmalloc
+# define obstack_chunk_free free
+# include <obstack.h>
-#define obstack_sgrow(Obs, Str) \
+# define obstack_sgrow(Obs, Str) \
obstack_grow (Obs, Str, strlen (Str))
-#define obstack_fgrow1(Obs, Format, Arg1) \
+# define obstack_fgrow1(Obs, Format, Arg1) \
do { \
char buf[4096]; \
sprintf (buf, Format, Arg1); \
obstack_grow (Obs, buf, strlen (buf)); \
} while (0)
-#define obstack_fgrow2(Obs, Format, Arg1, Arg2) \
+# define obstack_fgrow2(Obs, Format, Arg1, Arg2) \
do { \
char buf[4096]; \
sprintf (buf, Format, Arg1, Arg2); \
obstack_grow (Obs, buf, strlen (buf)); \
} while (0)
-#define obstack_fgrow3(Obs, Format, Arg1, Arg2, Arg3) \
+# define obstack_fgrow3(Obs, Format, Arg1, Arg2, Arg3) \
do { \
char buf[4096]; \
sprintf (buf, Format, Arg1, Arg2, Arg3); \
obstack_grow (Obs, buf, strlen (buf)); \
} while (0)
-#define obstack_fgrow4(Obs, Format, Arg1, Arg2, Arg3, Arg4) \
+# define obstack_fgrow4(Obs, Format, Arg1, Arg2, Arg3, Arg4) \
do { \
char buf[4096]; \
sprintf (buf, Format, Arg1, Arg2, Arg3, Arg4); \
| Extensions to use for the output files. |
`-----------------------------------------*/
-#ifndef OUTPUT_EXT
-# define OUTPUT_EXT ".output"
-#endif
+# ifndef OUTPUT_EXT
+# define OUTPUT_EXT ".output"
+# endif
-#ifndef TAB_EXT
-# define TAB_EXT ".tab"
-#endif
+# ifndef TAB_EXT
+# define TAB_EXT ".tab"
+# endif
-#ifndef DEFAULT_TMPDIR
-# define DEFAULT_TMPDIR "/tmp"
-#endif
+# ifndef DEFAULT_TMPDIR
+# define DEFAULT_TMPDIR "/tmp"
+# endif
| Free a linked list. |
`---------------------*/
-#define LIST_FREE(Type, List) \
+# define LIST_FREE(Type, List) \
do { \
Type *_node, *_next; \
for (_node = List; _node; _node = _next) \
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