mirror of
https://git.savannah.gnu.org/git/bison.git
synced 2026-03-09 20:33:03 +00:00
ef51bfa744
C++11 introduces "nullptr" which plays the role of C's NULL, in
replacement of "0". Fix the C++ skeletons to avoid warnings about
uses of "0" in place of "nullptr", and improve C skeletons to also use
this "nullptr" when compiled with a C++11 compiler.
* configure.ac: More C++ warnings.
* NEWS (2.5.1): Document this.
* data/c++.m4, data/c.m4 (b4_null_define): New.
(b4_null): Use YY_NULL instead of 0.
* data/glr.c, data/lalr1.cc, data/location.cc, data/yacc.c:
Call b4_null_define/b4_null where appropriate.
Use YY_NULL instead of NULL.
* data/location.cc (initialize): Accept a default argument,
YY_NULL.
* tests/actions.at, tests/calc.at: Adjust.
* data/glr.c, lib/libiberty.h, src/system.h (__attribute__):
Do not disable it when __STRICT_ANSI__ is defined, as, for
instance, it disables the __attribute__((unused)) which
protects us from some compiler warnings.
This was already done elsewhere in Bison, in 2001, see
4a0d893695.
* tests/regression.at: Adjust output.
239 lines
6.3 KiB
C
239 lines
6.3 KiB
C
/* System-dependent definitions for Bison.
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Copyright (C) 2000-2007, 2009-2012 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef BISON_SYSTEM_H
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# define BISON_SYSTEM_H
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/* flex 2.5.31 gratutiously defines macros like INT8_MIN. But this
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runs afoul of pre-C99 compilers that have <inttypes.h> or
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<stdint.h>, which are included below if available. It also runs
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afoul of pre-C99 compilers that define these macros in <limits.h>. */
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# if ! defined __STDC_VERSION__ || __STDC_VERSION__ < 199901
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# undef INT8_MIN
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# undef INT16_MIN
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# undef INT32_MIN
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# undef INT8_MAX
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# undef INT16_MAX
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# undef UINT8_MAX
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# undef INT32_MAX
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# undef UINT16_MAX
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# undef UINT32_MAX
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# endif
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# include <limits.h>
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# include <stddef.h>
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# include <stdlib.h>
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# include <string.h>
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# if HAVE_SYS_TYPES_H
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# include <sys/types.h>
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# endif
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# include <unistd.h>
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# include <inttypes.h>
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# ifndef UINTPTR_MAX
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/* This isn't perfect, but it's good enough for Bison, which needs
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only to hash pointers. */
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typedef size_t uintptr_t;
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# endif
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// Version mismatch.
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# define EX_MISMATCH 63
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/*---------.
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| Gnulib. |
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`---------*/
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# include <unlocked-io.h>
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# include <verify.h>
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# include <xalloc.h>
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/*-----------------.
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| GCC extensions. |
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`-----------------*/
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/* Use PACIFY_CC to indicate that Code is unimportant to the logic of Bison
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but that it is necessary for suppressing compiler warnings. For example,
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Code might be a variable initializer that's always overwritten before the
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variable is used.
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PACIFY_CC is intended to be useful only as a comment as it does not alter
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Code. It is tempting to redefine PACIFY_CC so that it will suppress Code
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when configuring without --enable-gcc-warnings. However, that would mean
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that, for maintainers, Bison would compile with potentially less warnings
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and safer logic than it would for users. Due to the overhead of M4,
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suppressing Code is unlikely to offer any significant improvement in
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Bison's performance anyway. */
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# define PACIFY_CC(Code) Code
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# ifndef __attribute__
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/* This feature is available in gcc versions 2.5 and later. */
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# if (! defined __GNUC__ || __GNUC__ < 2 \
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|| (__GNUC__ == 2 && __GNUC_MINOR__ < 5))
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# define __attribute__(Spec) /* empty */
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# endif
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# endif
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/* The __-protected variants of `format' and `printf' attributes
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are accepted by gcc versions 2.6.4 (effectively 2.7) and later. */
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# if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 7)
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# define __format__ format
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# define __printf__ printf
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# endif
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# ifndef ATTRIBUTE_NORETURN
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# define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__))
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# endif
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# ifndef ATTRIBUTE_UNUSED
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# define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
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# endif
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# define FUNCTION_PRINT() fprintf (stderr, "%s: ", __func__)
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/*------.
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| NLS. |
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`------*/
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# include <locale.h>
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# include <gettext.h>
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# define _(Msgid) gettext (Msgid)
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# define N_(Msgid) (Msgid)
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/*-----------.
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| Booleans. |
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`-----------*/
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# include <stdbool.h>
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/*-------------.
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| Assertions. |
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`-------------*/
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/* In the past, Bison defined aver to simply invoke abort in the case of
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a failed assertion. The rationale was that <assert.h>'s assertions
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were too heavyweight and could be disabled too easily. See
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discussions at
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<http://lists.gnu.org/archive/html/bison-patches/2006-01/msg00080.html>
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<http://lists.gnu.org/archive/html/bison-patches/2006-09/msg00111.html>.
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However, normal assert output can be helpful during development and
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in bug reports from users. Moreover, it's not clear now that
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<assert.h>'s assertions are significantly heavyweight. Finally, if
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users want to experiment with disabling assertions, it's debatable
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whether it's our responsibility to stop them. See discussion
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starting at
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<http://lists.gnu.org/archive/html/bison-patches/2009-09/msg00013.html>.
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For now, we use assert but we call it aver throughout Bison in case
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we later wish to try another scheme.
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*/
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# include <assert.h>
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# define aver assert
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/*-----------.
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| Obstacks. |
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`-----------*/
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# define obstack_chunk_alloc xmalloc
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# define obstack_chunk_free free
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# include <obstack.h>
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# define obstack_sgrow(Obs, Str) \
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obstack_grow (Obs, Str, strlen (Str))
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# define obstack_fgrow1(Obs, Format, Arg1) \
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do { \
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char buf[4096]; \
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sprintf (buf, Format, Arg1); \
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obstack_grow (Obs, buf, strlen (buf)); \
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} while (0)
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# define obstack_fgrow2(Obs, Format, Arg1, Arg2) \
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do { \
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char buf[4096]; \
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sprintf (buf, Format, Arg1, Arg2); \
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obstack_grow (Obs, buf, strlen (buf)); \
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} while (0)
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# define obstack_fgrow3(Obs, Format, Arg1, Arg2, Arg3) \
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do { \
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char buf[4096]; \
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sprintf (buf, Format, Arg1, Arg2, Arg3); \
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obstack_grow (Obs, buf, strlen (buf)); \
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} while (0)
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# define obstack_fgrow4(Obs, Format, Arg1, Arg2, Arg3, Arg4) \
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do { \
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char buf[4096]; \
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sprintf (buf, Format, Arg1, Arg2, Arg3, Arg4); \
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obstack_grow (Obs, buf, strlen (buf)); \
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} while (0)
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/*-----------------------------------------.
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| Extensions to use for the output files. |
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`-----------------------------------------*/
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# ifndef OUTPUT_EXT
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# define OUTPUT_EXT ".output"
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# endif
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# ifndef TAB_EXT
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# define TAB_EXT ".tab"
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# endif
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# ifndef DEFAULT_TMPDIR
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# define DEFAULT_TMPDIR "/tmp"
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# endif
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/*---------------------.
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| Free a linked list. |
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`---------------------*/
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# define LIST_FREE(Type, List) \
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do { \
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Type *_node, *_next; \
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for (_node = List; _node; _node = _next) \
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{ \
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_next = _node->next; \
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free (_node); \
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} \
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} while (0)
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/*---------------------------------------------.
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| Debugging memory allocation (must be last). |
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`---------------------------------------------*/
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# if WITH_DMALLOC
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# define DMALLOC_FUNC_CHECK
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# include <dmalloc.h>
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# endif /* WITH_DMALLOC */
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#endif /* ! BISON_SYSTEM_H */
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