X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/38609c34559fb86f2fb827dfed929ba9c396dc6f..bcbbf654863dd285b176a0f54a75a28c4bdac1d3:/src/system.h?ds=sidebyside diff --git a/src/system.h b/src/system.h index cc2b09b2..d3c544b4 100644 --- a/src/system.h +++ b/src/system.h @@ -1,7 +1,6 @@ /* 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 @@ -17,105 +16,113 @@ along with this program. If not, see . */ #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 or , which are included below if available. It also runs afoul of pre-C99 compilers that define these macros in . */ -#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 -#include -#include -#include - -#if HAVE_SYS_TYPES_H -# include -#endif - -#include -#include - -#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 +# include +# include +# include + +# if HAVE_SYS_TYPES_H +# include +# endif + +# include +# include + +# 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 -#include -#include +# include +# include +# include /*-----------------. | 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 +# include -#include -#define _(Msgid) gettext (Msgid) -#define N_(Msgid) (Msgid) +# include +# define _(Msgid) gettext (Msgid) +# define N_(Msgid) (Msgid) /*-----------. | Booleans. | `-----------*/ -#include +# include @@ -123,49 +130,61 @@ typedef size_t uintptr_t; | Assertions. | `-------------*/ -/* '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 '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. | `-----------*/ -#define obstack_chunk_alloc xmalloc -#define obstack_chunk_free free -#include +# define obstack_chunk_alloc xmalloc +# define obstack_chunk_free free +# include -#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); \ @@ -178,17 +197,17 @@ do { \ | 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 @@ -196,7 +215,7 @@ do { \ | Free a linked list. | `---------------------*/ -#define LIST_FREE(Type, List) \ +# define LIST_FREE(Type, List) \ do { \ Type *_node, *_next; \ for (_node = List; _node; _node = _next) \