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92777700d2
* sysdeps/unix/dirstream.h: Rewritten. * sysdeps/unix/readdir.c: Rewritten. * sysdeps/unix/telldir.c: Rewritten. * sysdeps/unix/closedir.c: Use <...> instead of "..." for dirstream.h. Remove __ from DIR struct member names. * sysdeps/unix/dirfd.c: Likewise. * sysdeps/unix/seekdir.c: Likewise. * sysdeps/unix/rewinddir.c: Likewise. * sysdeps/unix/opendir.c: Likewise. Don't allocate extra space after DIR structure. * sysdeps/stub/direct.h: File removed. * sysdeps/unix/bsd/bsd4.4/direct.h: File removed. * sysdeps/unix/bsd/direct.h: File removed. * sysdeps/unix/common/direct.h: File removed. * sysdeps/unix/sysv/irix4/direct.h: File removed. * sysdeps/unix/sysv/isc3/direct.h: File removed. * sysdeps/unix/sysv/sco3.2.4/direct.h: File removed. * sysdeps/unix/sysv/sysv4/solaris2/direct.h: File removed. * sysdeps/unix/common/direntry.h: New file. * sysdeps/unix/bsd/direntry.h: New file. * sysdeps/unix/bsd/bsd4.4/direntry.h: New file. * sysdeps/unix/sysv/direntry.h: New file. * sysdeps/stub/direntry.h: New file. * dirent/dirent.h (struct dirent): Type removed. Include <direntry.h> to define it. (_D_EXACT_NAMLEN, _D_ALLOC_NAMLEN): New macros. * dirent/Makefile (headers): Add direntry.h. (distribute): Remove direct.h. * sysdeps/posix/getcwd.c: Use new macros instead of d_namlen. * dirent/scandir.c: Likewise. * io/fts.c (fts_build): Likewise. * io/ftw.c (ftw_dir): Likewise. * sysdeps/posix/ttyname.c: Likewise. * sysdeps/unix/sysv/sysv4/solaris2/syscalls.list: New file. * sysdeps/mach/hurd/profil.c (MAX_PC_SAMPLES): New macro. (collector_timeout): New static variable. (update_waiter): Actually call __task_enable_pc_sampling. Set collector_timeout based on the `tick' count returned. (profile_waiter): Use MAX_PC_SAMPLES. Set nsamples before RPC. Use collector_timeout in __mach_msg call. * gmon/Makefile (noprof): New variable containing mcount. Append profil unless it is in $(unix-syscalls). (mcount.po): Use $(noprof) for list of targets in this rule. * libc-symbols.h: Define _LIBC before #include <config.h>. Sun Feb 25 12:29:23 1996 Roland McGrath <roland@charlie-brown.gnu.ai.mit.edu> * config.h.in [_LIBC] (HAVE_STRERROR): Define it. Protect 2nd page of #undef's for generator programs with #ifndef _LIBC. * time/zic.c, time/zdump.c, time/private.h: Updated from ADO's latest. Fri Feb 9 12:40:19 1996 Brendan Kehoe <brendan@lisa.cygnus.com> * libio/cleanup.c (_IO_cleanup_registration_needed) [!_G_HAVE_ATEXIT]: Init to NULL. * libio/filedoalloc.c (_IO_cleanup_registration_needed): Remove decl. Thu Feb 8 08:12:50 1996 Brendan Kehoe <brendan@cygnus.com> * libio/filedoalloc.c (_IO_cleanup_registration_needed): Revert previous change, since cleanup.c only defines it if _G_HAVE_ATEXIT. Wed Feb 7 15:10:17 1996 Brendan Kehoe <brendan@lisa.cygnus.com> * libio/filedoalloc.c (_IO_cleanup_registration_needed): Declare as extern. Sat Feb 24 11:34:13 1996 Roland McGrath <roland@charlie-brown.gnu.ai.mit.edu> * sysdeps/i386/memcmp.S: Fix argument %esp offsets. * time/sys/time.h (timeradd, timersub): New macros; BSD has these.
275 lines
9.1 KiB
C
275 lines
9.1 KiB
C
/* Support macros for making weak and strong aliases for symbols,
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and for using symbol sets and linker warnings with GNU ld.
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Copyright (C) 1995, 1996 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#ifndef _LIBC_SYMBOLS_H
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#define _LIBC_SYMBOLS_H
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/* This file's macros are included implicitly in the compilation of every
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file in the C library by -imacros.
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We include config.h which is generated by configure.
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It should define for us the following symbols:
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* HAVE_GNU_LD if using GNU ld, with support for weak symbols in a.out,
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and for symbol set and warning messages extensions in a.out and ELF.
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This implies HAVE_WEAK_SYMBOLS; set by --with-gnu-ld.
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* HAVE_ELF if using ELF, which supports weak symbols.
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This implies HAVE_WEAK_SYMBOLS; set by --with-elf.
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* HAVE_WEAK_SYMBOLS if weak symbols are available in the assembler and
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linker being used. Set by --with-weak-symbols.
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*/
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/* This is defined for the compilation of all C library code. features.h
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tests this to avoid inclusion of stubs.h while compiling the library,
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before stubs.h has been generated. Some library code that is shared
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with other packages also tests this symbol to see if it is being
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compiled as part of the C library. We must define this before including
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config.h, because it makes some definitions conditional on whether libc
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itself is being compiled, or just some generator program. */
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#define _LIBC 1
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#include <config.h>
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/*
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*/
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#ifndef ASSEMBLER
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/* Define the macros `_' and `N_' for conveniently marking translatable
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strings in the libc source code. */
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#define N_(msgid) msgid
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#include <libintl.h>
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extern const char _libc_intl_domainname[];
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#ifdef dgettext
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/* This is defined as an optimizing macro, so use it. */
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#define _(msgid) dgettext (_libc_intl_domainname, (msgid))
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#else
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/* Be sure to use only the __ name when `dgettext' is a plain function
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instead of an optimizing macro. */
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#define _(msgid) __dgettext (_libc_intl_domainname, (msgid))
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#endif
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#endif
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/*
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*/
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/* The symbols in all the user (non-_) macros are C symbols. Predefined
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should be HAVE_WEAK_SYMBOLS and/or HAVE_ELF and/or HAVE_GNU_LD.
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HAVE_WEAK_SYMBOLS is implied by the other two. HAVE_GNU_LD without
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HAVE_ELF implies a.out. */
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#ifndef HAVE_WEAK_SYMBOLS
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#if defined (HAVE_ELF) || defined (HAVE_GNU_LD)
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#define HAVE_WEAK_SYMBOLS
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#endif
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#endif
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#ifndef __SYMBOL_PREFIX
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#ifdef HAVE_ELF
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#define NO_UNDERSCORES
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#else
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#include <sysdep.h> /* Should define NO_UNDERSCORES. */
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#endif
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#ifdef NO_UNDERSCORES
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#define __SYMBOL_PREFIX
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#else
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#define __SYMBOL_PREFIX "_"
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#endif
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#endif
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#ifndef C_SYMBOL_NAME
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#ifdef NO_UNDERSCORES
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#define C_SYMBOL_NAME(name) name
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#else
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#define C_SYMBOL_NAME(name) _##name
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#endif
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#endif
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/* Define ALIAS as a strong alias for ORIGINAL. */
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#ifdef HAVE_ASM_SET_DIRECTIVE
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#define strong_alias_asm(original, alias) \
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ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME (alias); \
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.set C_SYMBOL_NAME (alias),C_SYMBOL_NAME (original)
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#ifdef ASSEMBLER
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#define strong_alias(original, alias) strong_alias_asm (original, alias)
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#else
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#define strong_alias(original, alias) \
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asm (__string_1 (ASM_GLOBAL_DIRECTIVE) " " __SYMBOL_PREFIX #alias "\n" \
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".set " __SYMBOL_PREFIX #alias "," __SYMBOL_PREFIX #original);
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#endif
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#else
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#define strong_alias_asm(original, alias) \
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ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME (alias); \
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C_SYMBOL_NAME (alias) = C_SYMBOL_NAME (original)
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#ifdef ASSEMBLER
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#define strong_alias(original, alias) strong_alias_asm (original, alias)
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#else
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#define strong_alias(original, alias) \
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asm (__string_1 (ASM_GLOBAL_DIRECTIVE) " " __SYMBOL_PREFIX #alias "\n" \
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__SYMBOL_PREFIX #alias " = " __SYMBOL_PREFIX #original);
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#endif
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#endif
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/* Helper macros used above. */
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#define __string_1(x) __string_0(x)
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#define __string_0(x) #x
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#ifdef HAVE_WEAK_SYMBOLS
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#ifdef ASSEMBLER
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/* Define ALIAS as a weak alias for ORIGINAL.
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If weak aliases are not available, this defines a strong alias. */
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#define weak_alias(original, alias) \
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.weak C_SYMBOL_NAME (alias); \
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C_SYMBOL_NAME (alias) = C_SYMBOL_NAME (original)
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/* Declare SYMBOL to be weak. */
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#define weak_symbol(symbol) .weak C_SYMBOL_NAME (symbol)
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#else
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#define weak_symbol(symbol) asm (".weak " __SYMBOL_PREFIX #symbol);
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#define weak_alias(original, alias) \
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asm (".weak " __SYMBOL_PREFIX #alias "\n" \
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__SYMBOL_PREFIX #alias " = " __SYMBOL_PREFIX #original);
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#endif
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#else
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#define weak_alias(original, alias) strong_alias(original, alias)
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#define weak_symbol(symbol) /* Do nothing. */
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#endif
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#if (!defined (ASSEMBLER) && \
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(__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 8)))
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/* GCC 2.8 and later has special syntax for weak symbols and aliases.
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Using that is better when possible, because the compiler and assembler
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are better clued in to what we are doing. */
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#undef strong_alias
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#define strong_alias(name, aliasname) \
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extern __typeof (name) aliasname __attribute__ ((alias (#name)));
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#ifdef HAVE_WEAK_SYMBOLS
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#undef weak_symbol
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#define weak_symbol(name) \
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extern __typeof (name) name __attribute__ ((weak));
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#undef weak_alias
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#define weak_alias(name, aliasname) \
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extern __typeof (name) aliasname __attribute__ ((weak, alias (#name)));
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#endif /* HAVE_WEAK_SYMBOLS. */
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#endif /* Not ASSEMBLER, and GCC 2.8 or later. */
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/* When a reference to SYMBOL is encountered, the linker will emit a
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warning message MSG. */
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#ifdef HAVE_GNU_LD
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#ifdef HAVE_ELF
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#define link_warning(symbol, msg) \
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static const char __evoke_link_warning_##symbol[] \
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__attribute__ ((section (".gnu.warning." #symbol))) = msg;
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#else
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#define link_warning(symbol, msg) \
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asm(".stabs \"" msg "\",30,0,0,0\n" \
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".stabs \"" __SYMBOL_PREFIX #symbol "\",1,0,0,0\n");
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#endif
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#else
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/* We will never be heard; they will all die horribly. */
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#define link_warning(symbol, msg)
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#endif
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/* A canned warning for sysdeps/stub functions. */
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#define stub_warning(name) \
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link_warning (name, \
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"warning: " #name " is not implemented and will always fail")
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/*
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*/
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#ifdef HAVE_GNU_LD
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/* Symbol set support macros. */
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#ifdef HAVE_ELF
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/* Make SYMBOL, which is in the text segment, an element of SET. */
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#define text_set_element(set, symbol) _elf_set_element(set, symbol)
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/* Make SYMBOL, which is in the data segment, an element of SET. */
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#define data_set_element(set, symbol) _elf_set_element(set, symbol)
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/* Make SYMBOL, which is in the bss segment, an element of SET. */
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#define bss_set_element(set, symbol) _elf_set_element(set, symbol)
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/* These are all done the same way in ELF.
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There is a new section created for each set. */
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#ifdef PIC
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/* When building a shared library, make the set section writable,
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because it will need to be relocated at run time anyway. */
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#define _elf_set_element(set, symbol) \
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static const void *__elf_set_##set##_element_##symbol##__ \
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__attribute__ ((unused, section (#set))) = &(symbol)
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#else
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#define _elf_set_element(set, symbol) \
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static const void *const __elf_set_##set##_element_##symbol##__ \
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__attribute__ ((unused, section (#set))) = &(symbol)
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#endif
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/* Define SET as a symbol set. This may be required (it is in a.out) to
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be able to use the set's contents. */
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#define symbol_set_define(set) symbol_set_declare(set)
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/* Declare SET for use in this module, if defined in another module. */
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#define symbol_set_declare(set) \
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extern void *const __start_##set __attribute__ ((__weak__)); \
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extern void *const __stop_##set __attribute__ ((__weak__)); \
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/* Gratuitously repeat weak decl, in case using broken GCC (<2.8). */\
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weak_symbol (__start_##set) weak_symbol (__stop_##set)
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/* Return a pointer (void *const *) to the first element of SET. */
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#define symbol_set_first_element(set) (&__start_##set)
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/* Return true iff PTR (a void *const *) has been incremented
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past the last element in SET. */
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#define symbol_set_end_p(set, ptr) ((ptr) >= &__stop_##set)
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#else /* Not ELF: a.out. */
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#define text_set_element(set, symbol) \
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asm(".stabs \"" __SYMBOL_PREFIX #set "\",23,0,0," __SYMBOL_PREFIX #symbol)
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#define data_set_element(set, symbol) \
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asm(".stabs \"" __SYMBOL_PREFIX #set "\",25,0,0," __SYMBOL_PREFIX #symbol)
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#define bss_set_element(set, symbol) ?error Must use initialized data.
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#define symbol_set_define(set) void *const (set)[1];
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#define symbol_set_declare(set) extern void *const (set)[1];
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#define symbol_set_first_element(set) &(set)[1]
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#define symbol_set_end_p(set, ptr) (*(ptr) == 0)
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#endif /* ELF. */
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#endif /* Have GNU ld. */
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#endif /* libc-symbols.h */
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