X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/c842365a01977bcf69f285116953c54622b19d7c..c85541913b99f841de090aacf626bb8f52f7f727:/src/system.h diff --git a/src/system.h b/src/system.h index 8ea56531..a56c058a 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 @@ -40,6 +39,19 @@ #include #include +#define ARRAY_CARDINALITY(Array) (sizeof (Array) / sizeof *(Array)) +#define STREQ(L, R) (strcmp(L, R) == 0) +#define STRNEQ(L, R) (!STREQ(L, R)) + +/* Just like strncmp, but the second argument must be a literal string + and you don't specify the length. */ +#define STRNCMP_LIT(S, Literal) \ + strncmp (S, "" Literal "", sizeof (Literal) - 1) + +/* Whether Literal is a prefix of S. */ +#define STRPREFIX_LIT(Literal, S) \ + (STRNCMP_LIT (S, Literal) == 0) + #if HAVE_SYS_TYPES_H # include #endif @@ -53,6 +65,8 @@ typedef size_t uintptr_t; #endif +// Version mismatch. +#define EX_MISMATCH 63 /*---------. | Gnulib. | @@ -67,18 +81,24 @@ typedef size_t uintptr_t; | 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__) + || (__GNUC__ == 2 && __GNUC_MINOR__ < 5)) # define __attribute__(Spec) /* empty */ # endif #endif @@ -123,17 +143,26 @@ typedef size_t uintptr_t; | Assertions. | `-------------*/ -/* 's assertions are too heavyweight, and can be disabled - too easily, so use aver rather than assert. See discussions at +/* 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. */ -static inline void -aver (bool assertion) -{ - if (! assertion) - abort (); -} +#include +#define aver assert /*-----------. @@ -147,33 +176,47 @@ aver (bool assertion) #define obstack_sgrow(Obs, Str) \ obstack_grow (Obs, Str, strlen (Str)) -#define obstack_fgrow1(Obs, Format, Arg1) \ -do { \ - char buf[4096]; \ - sprintf (buf, Format, Arg1); \ - obstack_grow (Obs, buf, strlen (buf)); \ -} while (0) +/* Output Str escaped for our postprocessing (i.e., escape M4 special + characters). -#define obstack_fgrow2(Obs, Format, Arg1, Arg2) \ -do { \ - char buf[4096]; \ - sprintf (buf, Format, Arg1, Arg2); \ - obstack_grow (Obs, buf, strlen (buf)); \ -} while (0) + For instance "[foo]" -> "@{foo@}", "$$" -> "$][$][". */ + +# define obstack_escape(Obs, Str) \ + do { \ + char const *p__; \ + for (p__ = Str; *p__; p__++) \ + switch (*p__) \ + { \ + case '$': obstack_sgrow (Obs, "$]["); break; \ + case '@': obstack_sgrow (Obs, "@@" ); break; \ + case '[': obstack_sgrow (Obs, "@{" ); break; \ + case ']': obstack_sgrow (Obs, "@}" ); break; \ + default: obstack_1grow (Obs, *p__ ); break; \ + } \ + } while (0) + + +/* Output Str both quoted for M4 (i.e., embed in [[...]]), and escaped + for our postprocessing (i.e., escape M4 special characters). If + Str is empty (or NULL), output "[]" instead of "[[]]" as it make M4 + programming easier (m4_ifval can be used). + + For instance "[foo]" -> "[[@{foo@}]]", "$$" -> "[[$][$][]]". */ + +# define obstack_quote(Obs, Str) \ + do { \ + char const* obstack_quote_p = Str; \ + if (obstack_quote_p && obstack_quote_p[0]) \ + { \ + obstack_sgrow (Obs, "[["); \ + obstack_escape (Obs, obstack_quote_p); \ + obstack_sgrow (Obs, "]]"); \ + } \ + else \ + obstack_sgrow (Obs, "[]"); \ + } while (0) -#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) \ -do { \ - char buf[4096]; \ - sprintf (buf, Format, Arg1, Arg2, Arg3, Arg4); \ - obstack_grow (Obs, buf, strlen (buf)); \ -} while (0) @@ -189,24 +232,20 @@ do { \ # define TAB_EXT ".tab" #endif -#ifndef DEFAULT_TMPDIR -# define DEFAULT_TMPDIR "/tmp" -#endif - /*---------------------. | Free a linked list. | `---------------------*/ -#define LIST_FREE(Type, List) \ -do { \ - Type *_node, *_next; \ - for (_node = List; _node; _node = _next) \ - { \ - _next = _node->next; \ - free (_node); \ - } \ +#define LIST_FREE(Type, List) \ +do { \ + Type *_node, *_next; \ + for (_node = List; _node; _node = _next) \ + { \ + _next = _node->next; \ + free (_node); \ + } \ } while (0)