diff options
Diffstat (limited to 'libc-symbols.h')
| -rw-r--r-- | libc-symbols.h | 322 |
1 files changed, 0 insertions, 322 deletions
diff --git a/libc-symbols.h b/libc-symbols.h deleted file mode 100644 index 07a35f1b53..0000000000 --- a/libc-symbols.h +++ /dev/null @@ -1,322 +0,0 @@ -/* Support macros for making weak and strong aliases for symbols, - and for using symbol sets and linker warnings with GNU ld. - Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Library General Public License as - published by the Free Software Foundation; either version 2 of the - License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Library General Public License for more details. - - You should have received a copy of the GNU Library General Public - License along with the GNU C Library; see the file COPYING.LIB. If not, - write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, - Boston, MA 02111-1307, USA. */ - -#ifndef _LIBC_SYMBOLS_H -#define _LIBC_SYMBOLS_H 1 - -/* This file's macros are included implicitly in the compilation of every - file in the C library by -imacros. - - We include config.h which is generated by configure. - It should define for us the following symbols: - - * HAVE_ASM_SET_DIRECTIVE if we have `.set B, A' instead of `A = B'. - * ASM_GLOBAL_DIRECTIVE with `.globl' or `.global'. - * HAVE_GNU_LD if using GNU ld, with support for weak symbols in a.out, - and for symbol set and warning messages extensions in a.out and ELF. - * HAVE_ELF if using ELF, which supports weak symbols using `.weak'. - * HAVE_ASM_WEAK_DIRECTIVE if we have weak symbols using `.weak'. - * HAVE_ASM_WEAKEXT_DIRECTIVE if we have weak symbols using `.weakext'. - - */ - -/* This is defined for the compilation of all C library code. features.h - tests this to avoid inclusion of stubs.h while compiling the library, - before stubs.h has been generated. Some library code that is shared - with other packages also tests this symbol to see if it is being - compiled as part of the C library. We must define this before including - config.h, because it makes some definitions conditional on whether libc - itself is being compiled, or just some generator program. */ -#define _LIBC 1 - -/* Enable declarations of GNU extensions, since we are compiling them. */ -#define _GNU_SOURCE 1 -/* And we also need the data for the reentrant functions. */ -#define _REENTRANT 1 - -#include <config.h> -/* - -*/ - -#ifndef ASSEMBLER - -/* Define the macros `_' and `N_' for conveniently marking translatable - strings in the libc source code. */ - -#define N_(msgid) msgid - -#include <libintl.h> -extern const char _libc_intl_domainname[]; - -#ifdef dgettext -/* This is defined as an optimizing macro, so use it. */ -#define _(msgid) dgettext (_libc_intl_domainname, (msgid)) -#else -/* Be sure to use only the __ name when `dgettext' is a plain function - instead of an optimizing macro. */ -#define _(msgid) __dgettext (_libc_intl_domainname, (msgid)) -#endif - -#endif - -/* - -*/ -/* The symbols in all the user (non-_) macros are C symbols. - HAVE_GNU_LD without HAVE_ELF implies a.out. */ - -#if defined (HAVE_ASM_WEAK_DIRECTIVE) || defined (HAVE_ASM_WEAKEXT_DIRECTIVE) -#define HAVE_WEAK_SYMBOLS -#endif - -#ifndef __SYMBOL_PREFIX -#ifdef NO_UNDERSCORES -#define __SYMBOL_PREFIX -#else -#define __SYMBOL_PREFIX "_" -#endif -#endif - -#ifndef C_SYMBOL_NAME -#ifdef NO_UNDERSCORES -#define C_SYMBOL_NAME(name) name -#else -#define C_SYMBOL_NAME(name) _##name -#endif -#endif - - -/* Define ALIAS as a strong alias for ORIGINAL. */ -#ifdef HAVE_ASM_SET_DIRECTIVE -#define strong_alias_asm(original, alias) \ - ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME (alias); \ - .set C_SYMBOL_NAME (alias),C_SYMBOL_NAME (original) -#ifdef ASSEMBLER -#define strong_alias(original, alias) strong_alias_asm (original, alias) -#else -#define strong_alias(original, alias) \ - asm (__string_1 (ASM_GLOBAL_DIRECTIVE) " " __SYMBOL_PREFIX #alias "\n" \ - ".set " __SYMBOL_PREFIX #alias "," __SYMBOL_PREFIX #original); -#endif -#else -#define strong_alias_asm(original, alias) \ - ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME (alias); \ - C_SYMBOL_NAME (alias) = C_SYMBOL_NAME (original) -#ifdef ASSEMBLER -#define strong_alias(original, alias) strong_alias_asm (original, alias) -#else -#define strong_alias(original, alias) \ - asm (__string_1 (ASM_GLOBAL_DIRECTIVE) " " __SYMBOL_PREFIX #alias "\n" \ - __SYMBOL_PREFIX #alias " = " __SYMBOL_PREFIX #original); -#endif -#endif - -/* Helper macros used above. */ -#define __string_1(x) __string_0(x) -#define __string_0(x) #x - - -#ifdef HAVE_WEAK_SYMBOLS - -#ifdef ASSEMBLER - -#ifdef HAVE_ASM_WEAKEXT_DIRECTIVE - -/* Define ALIAS as a weak alias for ORIGINAL. - If weak aliases are not available, this defines a strong alias. */ -#define weak_alias(original, alias) \ - .weakext C_SYMBOL_NAME (alias), C_SYMBOL_NAME (original) - -/* Declare SYMBOL as weak undefined symbol (resolved to 0 if not defined). */ -#define weak_extern(symbol) \ - .weakext C_SYMBOL_NAME (symbol) - -#else /* ! HAVE_ASM_WEAKEXT_DIRECTIVE */ - -/* Define ALIAS as a weak alias for ORIGINAL. - If weak aliases are not available, this defines a strong alias. */ -#define weak_alias(original, alias) \ - .weak C_SYMBOL_NAME (alias); \ - C_SYMBOL_NAME (alias) = C_SYMBOL_NAME (original) - - -/* Declare SYMBOL as weak undefined symbol (resolved to 0 if not defined). */ -#define weak_extern(symbol) \ - .weak C_SYMBOL_NAME (symbol) - -#endif /* ! HAVE_ASM_WEAKEXT_DIRECTIVE */ - -#else /* ! ASSEMBLER */ - -#ifdef HAVE_ASM_WEAKEXT_DIRECTIVE -#define weak_extern_asm(symbol) asm (".weakext " __SYMBOL_PREFIX #symbol); -#define weak_alias_asm(original, alias) \ - asm (".weakext " __SYMBOL_PREFIX #alias ", " __SYMBOL_PREFIX #original); -#else /* ! HAVE_ASM_WEAKEXT_DIRECTIVE */ -#define weak_extern_asm(symbol) asm (".weak " __SYMBOL_PREFIX #symbol); -#define weak_alias_asm(original, alias) \ - asm (".weak " __SYMBOL_PREFIX #alias "\n" \ - __SYMBOL_PREFIX #alias " = " __SYMBOL_PREFIX #original); -#endif /* ! HAVE_ASM_WEAKEXT_DIRECTIVE */ - -#define weak_alias(o, a) weak_alias_asm (o, a) -#define weak_extern(symbol) weak_extern_asm (symbol) - -#endif /* ! ASSEMBLER */ -#else -#define weak_alias(original, alias) strong_alias(original, alias) -#define weak_extern(symbol) /* Do nothing; the ref will be strong. */ -#endif - - -#if (!defined (ASSEMBLER) && \ - (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7))) -/* GCC 2.7 and later has special syntax for weak symbols and aliases. - Using that is better when possible, because the compiler and assembler - are better clued in to what we are doing. */ -#undef strong_alias -#define strong_alias(name, aliasname) \ - extern __typeof (name) aliasname __attribute__ ((alias (#name))); - -#ifdef HAVE_WEAK_SYMBOLS -#undef weak_alias -#define weak_alias(name, aliasname) \ - extern __typeof (name) aliasname __attribute__ ((weak, alias (#name))); - -/* This comes between the return type and function name in - a function definition to make that definition weak. */ -#define weak_function __attribute__ ((weak)) -#define weak_const_function __attribute__ ((weak, __const__)) - -#endif /* HAVE_WEAK_SYMBOLS. */ -#endif /* Not ASSEMBLER, and GCC 2.7 or later. */ - - -#ifndef weak_function -/* If we do not have the __attribute__ ((weak)) syntax, there is no way we - can define functions as weak symbols. The compiler will emit a `.globl' - directive for the function symbol, and a `.weak' directive in addition - will produce an error from the assembler. */ -#define weak_function /* empty */ -#define weak_const_function /* empty */ -#endif - - -/* When a reference to SYMBOL is encountered, the linker will emit a - warning message MSG. */ -#ifdef HAVE_GNU_LD -#ifdef HAVE_ELF - -/* We want the .gnu.warning.SYMBOL section to be unallocated. */ -#ifdef HAVE_ASM_PREVIOUS_DIRECTIVE -#define __make_section_unallocated(section_string) \ - asm(".section " section_string "; .previous"); -#elif defined (HAVE_ASM_POPSECTION_DIRECTIVE) -#define __make_section_unallocated(section_string) \ - asm(".pushsection " section_string "; .popsection"); -#else -#define __make_section_unallocated(section_string) -#endif - -#define link_warning(symbol, msg) \ - __make_section_unallocated (".gnu.warning." #symbol) \ - static const char __evoke_link_warning_##symbol[] \ - __attribute__ ((section (".gnu.warning." #symbol))) = msg; -#else -#define link_warning(symbol, msg) \ - asm(".stabs \"" msg "\",30,0,0,0\n" \ - ".stabs \"" __SYMBOL_PREFIX #symbol "\",1,0,0,0\n"); -#endif -#else -/* We will never be heard; they will all die horribly. */ -#define link_warning(symbol, msg) -#endif - -/* A canned warning for sysdeps/stub functions. */ -#define stub_warning(name) \ - link_warning (name, \ - "warning: " #name " is not implemented and will always fail") - -/* - -*/ - -#ifdef HAVE_GNU_LD - -/* Symbol set support macros. */ - -#ifdef HAVE_ELF - -/* Make SYMBOL, which is in the text segment, an element of SET. */ -#define text_set_element(set, symbol) _elf_set_element(set, symbol) -/* Make SYMBOL, which is in the data segment, an element of SET. */ -#define data_set_element(set, symbol) _elf_set_element(set, symbol) -/* Make SYMBOL, which is in the bss segment, an element of SET. */ -#define bss_set_element(set, symbol) _elf_set_element(set, symbol) - -/* These are all done the same way in ELF. - There is a new section created for each set. */ -#ifdef PIC -/* When building a shared library, make the set section writable, - because it will need to be relocated at run time anyway. */ -#define _elf_set_element(set, symbol) \ - static const void *__elf_set_##set##_element_##symbol##__ \ - __attribute__ ((unused, section (#set))) = &(symbol) -#else -#define _elf_set_element(set, symbol) \ - static const void *const __elf_set_##set##_element_##symbol##__ \ - __attribute__ ((unused, section (#set))) = &(symbol) -#endif - -/* Define SET as a symbol set. This may be required (it is in a.out) to - be able to use the set's contents. */ -#define symbol_set_define(set) symbol_set_declare(set) - -/* Declare SET for use in this module, if defined in another module. */ -#define symbol_set_declare(set) \ - extern void *const __start_##set __attribute__ ((__weak__)); \ - extern void *const __stop_##set __attribute__ ((__weak__)); \ - weak_extern (__start_##set) weak_extern (__stop_##set) - -/* Return a pointer (void *const *) to the first element of SET. */ -#define symbol_set_first_element(set) (&__start_##set) - -/* Return true iff PTR (a void *const *) has been incremented - past the last element in SET. */ -#define symbol_set_end_p(set, ptr) ((ptr) >= &__stop_##set) - -#else /* Not ELF: a.out. */ - -#define text_set_element(set, symbol) \ - asm(".stabs \"" __SYMBOL_PREFIX #set "\",23,0,0," __SYMBOL_PREFIX #symbol) -#define data_set_element(set, symbol) \ - asm(".stabs \"" __SYMBOL_PREFIX #set "\",25,0,0," __SYMBOL_PREFIX #symbol) -#define bss_set_element(set, symbol) ?error Must use initialized data. -#define symbol_set_define(set) void *const (set)[1]; -#define symbol_set_declare(set) extern void *const (set)[1]; - -#define symbol_set_first_element(set) &(set)[1] -#define symbol_set_end_p(set, ptr) (*(ptr) == 0) - -#endif /* ELF. */ -#endif /* Have GNU ld. */ - -#endif /* libc-symbols.h */ |