X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/c21493b89f5f5dd49e1f46d311326d5d4f49f8a4..e34e97bcd736ab3193bfd3abd4162db3b159836d:/src/system.h?ds=sidebyside diff --git a/src/system.h b/src/system.h index c1c45b49..9191b556 100644 --- a/src/system.h +++ b/src/system.h @@ -1,12 +1,11 @@ /* System-dependent definitions for Bison. - Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006 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 + 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 2, or (at your option) - any later version. + the Free Software Foundation, either version 3 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 @@ -14,8 +13,7 @@ GNU General Public License for more details. You should have received a copy of the GNU General Public License - along with this program; if not, write to the Free Software Foundation, - Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ + along with this program. If not, see . */ #ifndef BISON_SYSTEM_H #define BISON_SYSTEM_H @@ -41,61 +39,53 @@ #include #include -#include "unlocked-io.h" - #if HAVE_SYS_TYPES_H # include #endif -#if HAVE_UNISTD_H -# include -#endif +#include +#include -#if HAVE_INTTYPES_H -# include -#endif -#if HAVE_STDINT_H -# include -#endif - -#if ! HAVE_UINTPTR_T +#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 -#include +// Version mismatch. +#define EX_MISMATCH 63 + +/*---------. +| Gnulib. | +`---------*/ +#include #include #include -/*---------------------. -| Missing prototypes. | -`---------------------*/ - -#include - -/* From lib/basename.c. */ -char *base_name (char const *name); - - /*-----------------. | 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 +/* 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__ +# if (! defined __GNUC__ || __GNUC__ < 2 \ + || (__GNUC__ == 2 && __GNUC_MINOR__ < 5) || __STRICT_ANSI__) # define __attribute__(Spec) /* empty */ # endif #endif @@ -115,6 +105,8 @@ char *base_name (char const *name); # define ATTRIBUTE_UNUSED __attribute__ ((__unused__)) #endif +#define FUNCTION_PRINT() fprintf (stderr, "%s: ", __func__) + /*------. | NLS. | `------*/ @@ -126,15 +118,6 @@ char *base_name (char const *name); #define N_(Msgid) (Msgid) -/*-------------------------------. -| Fix broken compilation flags. | -`-------------------------------*/ - -#ifndef LOCALEDIR -# define LOCALEDIR "/usr/local/share/locale" -#endif - - /*-----------. | Booleans. | `-----------*/ @@ -142,6 +125,33 @@ char *base_name (char const *name); #include + +/*-------------. +| Assertions. | +`-------------*/ + +/* In the past, Bison defined aver to simply invoke abort in the case of + a failed assertion. The rationale was that 's assertions + were too heavyweight and could be disabled too easily. See + discussions at + + . + + However, normal assert output can be helpful during development and + in bug reports from users. Moreover, it's not clear now that + '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 + . + + For now, we use assert but we call it aver throughout Bison in case + we later wish to try another scheme. +*/ +#include +#define aver assert + + /*-----------. | Obstacks. | `-----------*/