lalr1.cc: check (and fix) %initial-action exception safety

[bison.git] / src / system.h

diff --git a/src/system.h b/src/system.h
index 1e161770ce9c03c18b43af26847455f2324f4228..bf7f59f9dbb66ab718f148e81517aacf7efbd50b 100644 (file)
--- a/src/system.h
+++ b/src/system.h
@@ -1,12 +1,11 @@
 /* System-dependent definitions for Bison.
 
 /* System-dependent definitions for Bison.
 

-   Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005 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
    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
 
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of


@@ -14,155 +13,191 @@
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
    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 <http://www.gnu.org/licenses/>.  */

 
 #ifndef BISON_SYSTEM_H
 
 #ifndef BISON_SYSTEM_H

-#define BISON_SYSTEM_H
-
-#if HAVE_CONFIG_H
-# include <config.h>
-#endif
-
-#include <limits.h>
-#include <stddef.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include "unlocked-io.h"
-
-#if HAVE_SYS_TYPES_H
-# include <sys/types.h>
-#endif
+# 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

 
 

-#if HAVE_UNISTD_H
+# include <limits.h>
+# include <stddef.h>
+# include <stdlib.h>
+# include <string.h>

 # include <unistd.h>
 # include <unistd.h>

-#endif
-
-#if HAVE_INTTYPES_H

 # include <inttypes.h>
 # include <inttypes.h>

-#endif
-#if HAVE_STDINT_H
-# include <stdint.h>
-#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;
 /* This isn't perfect, but it's good enough for Bison, which needs
    only to hash pointers.  */
 typedef size_t uintptr_t;

-#endif
-
-#include <verify.h>
-#include <xalloc.h>
+# endif

 
 

+// Version mismatch.
+# define EX_MISMATCH 63

 
 

-/*---------------------.
-| Missing prototypes.  |
-`---------------------*/
+/*---------.
+| Gnulib.  |
+`---------*/

 
 

-#include <stpcpy.h>
+# include <unlocked-io.h>
+# include <verify.h>
+# include <xalloc.h>

 
 
 /*-----------------.
 | GCC extensions.  |
 `-----------------*/
 
 
 
 /*-----------------.
 | 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.  */
 /* 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

-#endif

 
 /* The __-protected variants of `format' and `printf' attributes
    are accepted by gcc versions 2.6.4 (effectively 2.7) and later.  */
 
 /* 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

 
 /*------.
 | NLS.  |
 `------*/
 
 
 /*------.
 | NLS.  |
 `------*/
 

-#include <locale.h>
-
-#include <gettext.h>
-#define _(Msgid)  gettext (Msgid)
-#define N_(Msgid) (Msgid)
+# include <locale.h>

 
 

-
-/*-------------------------------.
-| Fix broken compilation flags.  |
-`-------------------------------*/
-
-#ifndef LOCALEDIR
-# define LOCALEDIR "/usr/local/share/locale"
-#endif
+# include <gettext.h>
+# define _(Msgid)  gettext (Msgid)
+# define N_(Msgid) (Msgid)

 
 
 /*-----------.
 | Booleans.  |
 `-----------*/
 
 
 
 /*-----------.
 | Booleans.  |
 `-----------*/
 

-#include <stdbool.h>
+# include <stdbool.h>
+
+
+
+/*-------------.
+| Assertions.  |
+`-------------*/
+
+/* 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.  |
 `-----------*/
 
 
 
 /*-----------.
 | 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))
 
   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)

 
 
 
 
 
 


@@ -170,17 +205,13 @@ do {                                                              \
 | Extensions to use for the output files.  |
 `-----------------------------------------*/
 
 | Extensions to use for the output files.  |
 `-----------------------------------------*/
 

-#ifndef OUTPUT_EXT
-# define OUTPUT_EXT ".output"
-#endif
-
-#ifndef TAB_EXT
-# define TAB_EXT ".tab"
-#endif
+# ifndef OUTPUT_EXT
+#  define OUTPUT_EXT ".output"
+# endif

 
 

-#ifndef DEFAULT_TMPDIR
-# define DEFAULT_TMPDIR "/tmp"
-#endif
+# ifndef TAB_EXT
+#  define TAB_EXT ".tab"
+# endif

 
 
 
 
 
 


@@ -188,15 +219,15 @@ do {                                                              \
 | Free a linked list.  |
 `---------------------*/
 
 | Free a linked list.  |
 `---------------------*/
 

-#define LIST_FREE(Type, List)                  \
-do {                                           \
-  Type *_node, *_next;                         \
-  for (_node = List; _node; _node = _next)     \
-    {                                          \
-      _next = _node->next;                     \
-      free (_node);                            \
-    }                                          \
-} while (0)
+# define LIST_FREE(Type, List)                  \
+  do {                                          \
+    Type *_node, *_next;                        \
+    for (_node = List; _node; _node = _next)    \
+      {                                         \
+        _next = _node->next;                    \
+        free (_node);                           \
+      }                                         \
+  } while (0)

 
 
 /*---------------------------------------------.
 
 
 /*---------------------------------------------.