1 /* Configuration definitions. 2 Copyright (C) 2008, 2009 Red Hat, Inc. 3 This file is part of elfutils. 4 5 This file is free software; you can redistribute it and/or modify 6 it under the terms of either 7 8 * the GNU Lesser General Public License as published by the Free 9 Software Foundation; either version 3 of the License, or (at 10 your option) any later version 11 12 or 13 14 * the GNU General Public License as published by the Free 15 Software Foundation; either version 2 of the License, or (at 16 your option) any later version 17 18 or both in parallel, as here. 19 20 elfutils is distributed in the hope that it will be useful, but 21 WITHOUT ANY WARRANTY; without even the implied warranty of 22 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 23 General Public License for more details. 24 25 You should have received copies of the GNU General Public License and 26 the GNU Lesser General Public License along with this program. If 27 not, see <http://www.gnu.org/licenses/>. */ 28 29 #ifndef EU_CONFIG_H 30 #define EU_CONFIG_H 1 31 32 #ifdef USE_LOCKS 33 # include <pthread.h> 34 # include <assert.h> 35 # define rwlock_define(class,name) class pthread_rwlock_t name 36 # define RWLOCK_CALL(call) \ 37 ({ int _err = pthread_rwlock_ ## call; assert_perror (_err); }) 38 # define rwlock_init(lock) RWLOCK_CALL (init (&lock, NULL)) 39 # define rwlock_fini(lock) RWLOCK_CALL (destroy (&lock)) 40 # define rwlock_rdlock(lock) RWLOCK_CALL (rdlock (&lock)) 41 # define rwlock_wrlock(lock) RWLOCK_CALL (wrlock (&lock)) 42 # define rwlock_unlock(lock) RWLOCK_CALL (unlock (&lock)) 43 #else 44 /* Eventually we will allow multi-threaded applications to use the 45 libraries. Therefore we will add the necessary locking although 46 the macros used expand to nothing for now. */ 47 # define rwlock_define(class,name) class int name 48 # define rwlock_init(lock) ((void) (lock)) 49 # define rwlock_fini(lock) ((void) (lock)) 50 # define rwlock_rdlock(lock) ((void) (lock)) 51 # define rwlock_wrlock(lock) ((void) (lock)) 52 # define rwlock_unlock(lock) ((void) (lock)) 53 #endif /* USE_LOCKS */ 54 55 /* gettext helper macro. */ 56 #define N_(Str) Str 57 58 /* Compiler-specific definitions. */ 59 #define strong_alias(name, aliasname) \ 60 extern __typeof (name) aliasname __attribute__ ((alias (#name))); 61 62 #ifdef __i386__ 63 # define internal_function __attribute__ ((regparm (3), stdcall)) 64 #else 65 # define internal_function /* nothing */ 66 #endif 67 68 #define internal_strong_alias(name, aliasname) \ 69 extern __typeof (name) aliasname __attribute__ ((alias (#name))) internal_function; 70 71 #define attribute_hidden \ 72 __attribute__ ((visibility ("hidden"))) 73 74 /* Define ALLOW_UNALIGNED if the architecture allows operations on 75 unaligned memory locations. */ 76 #define SANITIZE_UNDEFINED 1 77 #if (defined __i386__ || defined __x86_64__) && ! CHECK_UNDEFINED 78 # define ALLOW_UNALIGNED 1 79 #else 80 # define ALLOW_UNALIGNED 0 81 #endif 82 83 #if DEBUGPRED 84 # ifdef __x86_64__ 85 asm (".section predict_data, \"aw\"; .previous\n" 86 ".section predict_line, \"a\"; .previous\n" 87 ".section predict_file, \"a\"; .previous"); 88 # ifndef PIC 89 # define debugpred__(e, E) \ 90 ({ long int _e = !!(e); \ 91 asm volatile (".pushsection predict_data; ..predictcnt%=: .quad 0; .quad 0\n" \ 92 ".section predict_line; .quad %c1\n" \ 93 ".section predict_file; .quad %c2; .popsection\n" \ 94 "addq $1,..predictcnt%=(,%0,8)" \ 95 : : "r" (_e == E), "i" (__LINE__), "i" (__FILE__)); \ 96 __builtin_expect (_e, E); \ 97 }) 98 # endif 99 # elif defined __i386__ 100 asm (".section predict_data, \"aw\"; .previous\n" 101 ".section predict_line, \"a\"; .previous\n" 102 ".section predict_file, \"a\"; .previous"); 103 # ifndef PIC 104 # define debugpred__(e, E) \ 105 ({ long int _e = !!(e); \ 106 asm volatile (".pushsection predict_data; ..predictcnt%=: .long 0; .long 0\n" \ 107 ".section predict_line; .long %c1\n" \ 108 ".section predict_file; .long %c2; .popsection\n" \ 109 "incl ..predictcnt%=(,%0,8)" \ 110 : : "r" (_e == E), "i" (__LINE__), "i" (__FILE__)); \ 111 __builtin_expect (_e, E); \ 112 }) 113 # endif 114 # endif 115 # ifdef debugpred__ 116 # define unlikely(e) debugpred__ (e,0) 117 # define likely(e) debugpred__ (e,1) 118 # endif 119 #endif 120 #ifndef likely 121 # define unlikely(expr) __builtin_expect (!!(expr), 0) 122 # define likely(expr) __builtin_expect (!!(expr), 1) 123 #endif 124 125 #define obstack_calloc(ob, size) \ 126 ({ size_t _s = (size); memset (obstack_alloc (ob, _s), '\0', _s); }) 127 #define obstack_strdup(ob, str) \ 128 ({ const char *_s = (str); obstack_copy0 (ob, _s, strlen (_s)); }) 129 #define obstack_strndup(ob, str, n) \ 130 ({ const char *_s = (str); obstack_copy0 (ob, _s, strnlen (_s, n)); }) 131 132 #if __STDC_VERSION__ >= 199901L 133 # define flexarr_size /* empty */ 134 #else 135 # define flexarr_size 0 136 #endif 137 138 /* Calling conventions. */ 139 #ifdef __i386__ 140 # define CALLING_CONVENTION regparm (3), stdcall 141 # define AND_CALLING_CONVENTION , regparm (3), stdcall 142 #else 143 # define CALLING_CONVENTION 144 # define AND_CALLING_CONVENTION 145 #endif 146 147 /* Avoid PLT entries. */ 148 #ifdef PIC 149 # define INTUSE(name) _INTUSE(name) 150 # define _INTUSE(name) __##name##_internal 151 # define INTDEF(name) _INTDEF(name) 152 # define _INTDEF(name) \ 153 extern __typeof__ (name) __##name##_internal __attribute__ ((alias (#name))); 154 # define INTDECL(name) _INTDECL(name) 155 # define _INTDECL(name) \ 156 extern __typeof__ (name) __##name##_internal attribute_hidden; 157 #else 158 # define INTUSE(name) name 159 # define INTDEF(name) /* empty */ 160 # define INTDECL(name) /* empty */ 161 #endif 162 163 /* This macro is used by the tests conditionalize for standalone building. */ 164 #define ELFUTILS_HEADER(name) <lib##name.h> 165 166 167 #ifdef SYMBOL_VERSIONING 168 # define OLD_VERSION(name, version) \ 169 asm (".globl _compat." #version "." #name "\n" \ 170 "_compat." #version "." #name " = " #name "\n" \ 171 ".symver _compat." #version "." #name "," #name "@" #version); 172 # define NEW_VERSION(name, version) \ 173 asm (".symver " #name "," #name "@@@" #version); 174 # define COMPAT_VERSION_NEWPROTO(name, version, prefix) \ 175 asm (".symver _compat." #version "." #name "," #name "@" #version); \ 176 __typeof (_compat_##prefix##_##name) _compat_##prefix##_##name \ 177 asm ("_compat." #version "." #name); 178 # define COMPAT_VERSION(name, version, prefix) \ 179 asm (".symver _compat." #version "." #name "," #name "@" #version); \ 180 __typeof (name) _compat_##prefix##_##name asm ("_compat." #version "." #name); 181 #else 182 # define OLD_VERSION(name, version) /* Nothing for static linking. */ 183 # define NEW_VERSION(name, version) /* Nothing for static linking. */ 184 # define COMPAT_VERSION_NEWPROTO(name, version, prefix) \ 185 error "should use #ifdef SYMBOL_VERSIONING" 186 # define COMPAT_VERSION(name, version, prefix) error "should use #ifdef SYMBOL_VERSIONING" 187 #endif 188 189 190 #endif /* eu-config.h */ 191