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git.ipfire.org Git - thirdparty/glibc.git/blob - include/libc-symbols.h
1 /* Support macros for making weak and strong aliases for symbols,
2 and for using symbol sets and linker warnings with GNU ld.
3 Copyright (C) 1995-1998,2000,2001,2002,2003 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, write to the Free
18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
21 #ifndef _LIBC_SYMBOLS_H
22 #define _LIBC_SYMBOLS_H 1
24 /* This file's macros are included implicitly in the compilation of every
25 file in the C library by -imacros.
27 We include config.h which is generated by configure.
28 It should define for us the following symbols:
30 * HAVE_ASM_SET_DIRECTIVE if we have `.set B, A' instead of `A = B'.
31 * ASM_GLOBAL_DIRECTIVE with `.globl' or `.global'.
32 * ASM_TYPE_DIRECTIVE_PREFIX with `@' or `#' or whatever for .type,
33 or leave it undefined if there is no .type directive.
34 * HAVE_GNU_LD if using GNU ld, with support for weak symbols in a.out,
35 and for symbol set and warning messages extensions in a.out and ELF.
36 * HAVE_ELF if using ELF, which supports weak symbols using `.weak'.
37 * HAVE_ASM_WEAK_DIRECTIVE if we have weak symbols using `.weak'.
38 * HAVE_ASM_WEAKEXT_DIRECTIVE if we have weak symbols using `.weakext'.
42 /* This is defined for the compilation of all C library code. features.h
43 tests this to avoid inclusion of stubs.h while compiling the library,
44 before stubs.h has been generated. Some library code that is shared
45 with other packages also tests this symbol to see if it is being
46 compiled as part of the C library. We must define this before including
47 config.h, because it makes some definitions conditional on whether libc
48 itself is being compiled, or just some generator program. */
51 /* Enable declarations of GNU extensions, since we are compiling them. */
53 /* And we also need the data for the reentrant functions. */
58 /* The symbols in all the user (non-_) macros are C symbols.
59 HAVE_GNU_LD without HAVE_ELF implies a.out. */
61 #if defined HAVE_ASM_WEAK_DIRECTIVE || defined HAVE_ASM_WEAKEXT_DIRECTIVE
62 # define HAVE_WEAK_SYMBOLS
65 #ifndef __SYMBOL_PREFIX
66 # ifdef NO_UNDERSCORES
67 # define __SYMBOL_PREFIX
69 # define __SYMBOL_PREFIX "_"
74 # ifdef NO_UNDERSCORES
75 # define C_SYMBOL_NAME(name) name
77 # define C_SYMBOL_NAME(name) _##name
82 # define ASM_LINE_SEP ;
85 #ifdef HAVE_ASM_GLOBAL_DOT_NAME
86 # ifndef C_SYMBOL_DOT_NAME
87 # if defined __GNUC__ && defined __GNUC_MINOR__ \
88 && (__GNUC__ << 16) + __GNUC_MINOR__ >= (3 << 16) + 1
89 # define C_SYMBOL_DOT_NAME(name) .name
91 # define C_SYMBOL_DOT_NAME(name) .##name
97 /* GCC understands weak symbols and aliases; use its interface where
98 possible, instead of embedded assembly language. */
100 /* Define ALIASNAME as a strong alias for NAME. */
101 # define strong_alias(name, aliasname) _strong_alias(name, aliasname)
102 # define _strong_alias(name, aliasname) \
103 extern __typeof (name) aliasname __attribute__ ((alias (#name)));
105 /* This comes between the return type and function name in
106 a function definition to make that definition weak. */
107 # define weak_function __attribute__ ((weak))
108 # define weak_const_function __attribute__ ((weak, __const__))
110 # ifdef HAVE_WEAK_SYMBOLS
112 /* Define ALIASNAME as a weak alias for NAME.
113 If weak aliases are not available, this defines a strong alias. */
114 # define weak_alias(name, aliasname) _weak_alias (name, aliasname)
115 # define _weak_alias(name, aliasname) \
116 extern __typeof (name) aliasname __attribute__ ((weak, alias (#name)));
118 /* Declare SYMBOL as weak undefined symbol (resolved to 0 if not defined). */
119 # define weak_extern(symbol) _weak_extern (weak symbol)
120 # define _weak_extern(expr) _Pragma (#expr)
124 # define weak_alias(name, aliasname) strong_alias(name, aliasname)
125 # define weak_extern(symbol) /* Nothing. */
129 #else /* __ASSEMBLER__ */
131 # ifdef HAVE_ASM_SET_DIRECTIVE
132 # ifdef HAVE_ASM_GLOBAL_DOT_NAME
133 # define strong_alias(original, alias) \
134 ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME (alias) ASM_LINE_SEP \
135 .set C_SYMBOL_NAME (alias),C_SYMBOL_NAME (original) ASM_LINE_SEP \
136 ASM_GLOBAL_DIRECTIVE C_SYMBOL_DOT_NAME (alias) ASM_LINE_SEP \
137 .set C_SYMBOL_DOT_NAME (alias),C_SYMBOL_DOT_NAME (original)
138 # define strong_data_alias(original, alias) \
139 ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME (alias) ASM_LINE_SEP \
140 .set C_SYMBOL_NAME (alias),C_SYMBOL_NAME (original)
142 # define strong_alias(original, alias) \
143 ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME (alias) ASM_LINE_SEP \
144 .set C_SYMBOL_NAME (alias),C_SYMBOL_NAME (original)
145 # define strong_data_alias(original, alias) strong_alias(original, alias)
148 # ifdef HAVE_ASM_GLOBAL_DOT_NAME
149 # define strong_alias(original, alias) \
150 ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME (alias) ASM_LINE_SEP \
151 C_SYMBOL_NAME (alias) = C_SYMBOL_NAME (original) ASM_LINE_SEP \
152 ASM_GLOBAL_DIRECTIVE C_SYMBOL_DOT_NAME (alias) ASM_LINE_SEP \
153 C_SYMBOL_DOT_NAME (alias) = C_SYMBOL_DOT_NAME (original)
154 # define strong_data_alias(original, alias) \
155 ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME (alias) ASM_LINE_SEP \
156 C_SYMBOL_NAME (alias) = C_SYMBOL_NAME (original)
158 # define strong_alias(original, alias) \
159 ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME (alias) ASM_LINE_SEP \
160 C_SYMBOL_NAME (alias) = C_SYMBOL_NAME (original)
161 # define strong_data_alias(original, alias) strong_alias(original, alias)
165 # ifdef HAVE_WEAK_SYMBOLS
166 # ifdef HAVE_ASM_WEAKEXT_DIRECTIVE
167 # ifdef HAVE_ASM_GLOBAL_DOT_NAME
168 # define weak_alias(original, alias) \
169 .weakext C_SYMBOL_NAME (alias), C_SYMBOL_NAME (original) ASM_LINE_SEP \
170 .weakext C_SYMBOL_DOT_NAME (alias), C_SYMBOL_DOT_NAME (original)
172 # define weak_alias(original, alias) \
173 .weakext C_SYMBOL_NAME (alias), C_SYMBOL_NAME (original)
175 # define weak_extern(symbol) \
176 .weakext C_SYMBOL_NAME (symbol)
178 # else /* ! HAVE_ASM_WEAKEXT_DIRECTIVE */
180 # ifdef HAVE_ASM_GLOBAL_DOT_NAME
181 # define weak_alias(original, alias) \
182 .weak C_SYMBOL_NAME (alias) ASM_LINE_SEP \
183 C_SYMBOL_NAME (alias) = C_SYMBOL_NAME (original) ASM_LINE_SEP \
184 .weak C_SYMBOL_DOT_NAME (alias) ASM_LINE_SEP \
185 C_SYMBOL_DOT_NAME (alias) = C_SYMBOL_DOT_NAME (original)
187 # define weak_alias(original, alias) \
188 .weak C_SYMBOL_NAME (alias) ASM_LINE_SEP \
189 C_SYMBOL_NAME (alias) = C_SYMBOL_NAME (original)
192 # define weak_extern(symbol) \
193 .weak C_SYMBOL_NAME (symbol)
195 # endif /* ! HAVE_ASM_WEAKEXT_DIRECTIVE */
197 # else /* ! HAVE_WEAK_SYMBOLS */
199 # define weak_alias(original, alias) strong_alias(original, alias)
200 # define weak_extern(symbol) /* Nothing */
201 # endif /* ! HAVE_WEAK_SYMBOLS */
203 #endif /* __ASSEMBLER__ */
205 /* On some platforms we can make internal function calls (i.e., calls of
206 functions not exported) a bit faster by using a different calling
208 #ifndef internal_function
209 # define internal_function /* empty */
212 /* Prepare for the case that `__builtin_expect' is not available. */
213 #ifndef HAVE_BUILTIN_EXPECT
214 # define __builtin_expect(expr, val) (expr)
217 /* Determine the return address. */
218 #define RETURN_ADDRESS(nr) \
219 __builtin_extract_return_addr (__builtin_return_address (nr))
221 /* When a reference to SYMBOL is encountered, the linker will emit a
222 warning message MSG. */
226 /* We want the .gnu.warning.SYMBOL section to be unallocated. */
227 # ifdef HAVE_ASM_PREVIOUS_DIRECTIVE
228 # define __make_section_unallocated(section_string) \
229 asm (".section " section_string "\n\t.previous");
230 # elif defined HAVE_ASM_POPSECTION_DIRECTIVE
231 # define __make_section_unallocated(section_string) \
232 asm (".pushsection " section_string "\n\t.popsection");
234 # define __make_section_unallocated(section_string)
237 /* Tacking on "\n\t#" to the section name makes gcc put it's bogus
238 section attributes on what looks like a comment to the assembler. */
239 # ifdef HAVE_SECTION_QUOTES
240 # define __sec_comment "\"\n\t#\""
242 # define __sec_comment "\n\t#"
244 # define link_warning(symbol, msg) \
245 __make_section_unallocated (".gnu.warning." #symbol) \
246 static const char __evoke_link_warning_##symbol[] \
247 __attribute__ ((unused, section (".gnu.warning." #symbol __sec_comment))) \
249 # define libc_freeres_ptr(decl) \
250 __make_section_unallocated ("__libc_freeres_ptrs, \"aw\", %nobits") \
251 decl __attribute__ ((section ("__libc_freeres_ptrs" __sec_comment)))
252 # define __libc_freeres_fn_section \
253 __attribute__ ((section ("__libc_freeres_fn")))
254 # else /* Not ELF: a.out */
256 /* XCOFF does not support .stabs.
257 The native aix linker will remove the .stab and .stabstr sections
258 The gnu linker will have a fatal error if there is a relocation for
259 symbol in the .stab section. Silently disable this macro. */
260 # define link_warning(symbol, msg)
262 # define link_warning(symbol, msg) \
263 asm (".stabs \"" msg "\",30,0,0,0\n\t" \
264 ".stabs \"" __SYMBOL_PREFIX #symbol "\",1,0,0,0\n");
266 # define libc_freeres_ptr(decl) decl
267 # define __libc_freeres_fn_section
270 /* We will never be heard; they will all die horribly. */
271 # define link_warning(symbol, msg)
272 # define libc_freeres_ptr(decl) decl
273 # define __libc_freeres_fn_section
275 #define libc_freeres_fn(name) \
276 static void name (void) __attribute_used__ __libc_freeres_fn_section; \
277 text_set_element (__libc_subfreeres, name); \
278 static void name (void)
280 /* A canned warning for sysdeps/stub functions. */
281 #define stub_warning(name) \
282 link_warning (name, \
283 "warning: " #name " is not implemented and will always fail")
285 /* Warning for linking functions calling dlopen into static binaries. */
287 #define static_link_warning(name)
289 #define static_link_warning(name) static_link_warning1(name)
290 #define static_link_warning1(name) \
291 link_warning(name, "Using '" #name "' in statically linked applications \
292 requires at runtime the shared libraries from the glibc version used \
296 /* Declare SYMBOL to be TYPE (`function' or `object') and of SIZE bytes,
297 when the assembler supports such declarations (such as in ELF).
298 This is only necessary when defining something in assembly, or playing
299 funny alias games where the size should be other than what the compiler
301 #define declare_symbol(symbol, type, size) \
302 declare_symbol_1 (symbol, type, size)
303 #ifdef ASM_TYPE_DIRECTIVE_PREFIX
304 # ifdef __ASSEMBLER__
305 # define declare_symbol_1(symbol, type, size) \
306 .type C_SYMBOL_NAME (symbol), \
307 declare_symbol_1_paste (ASM_TYPE_DIRECTIVE_PREFIX, type), size
308 # define declare_symbol_1_paste(a, b) declare_symbol_1_paste_1 (a,b)
309 # define declare_symbol_1_paste_1(a,b) a##b
310 # else /* Not __ASSEMBLER__. */
311 # define declare_symbol_1(symbol, type, size) \
312 asm (".type " __SYMBOL_PREFIX #symbol ", " \
313 declare_symbol_1_stringify (ASM_TYPE_DIRECTIVE_PREFIX) #type \
314 "\n\t.size " __SYMBOL_PREFIX #symbol ", " #size);
315 # define declare_symbol_1_stringify(x) declare_symbol_1_stringify_1 (x)
316 # define declare_symbol_1_stringify_1(x) #x
317 # endif /* __ASSEMBLER__ */
319 # define declare_symbol_1(symbol, type, size) /* Nothing. */
329 /* Symbol set support macros. */
333 /* Make SYMBOL, which is in the text segment, an element of SET. */
334 # define text_set_element(set, symbol) _elf_set_element(set, symbol)
335 /* Make SYMBOL, which is in the data segment, an element of SET. */
336 # define data_set_element(set, symbol) _elf_set_element(set, symbol)
337 /* Make SYMBOL, which is in the bss segment, an element of SET. */
338 # define bss_set_element(set, symbol) _elf_set_element(set, symbol)
340 /* These are all done the same way in ELF.
341 There is a new section created for each set. */
343 /* When building a shared library, make the set section writable,
344 because it will need to be relocated at run time anyway. */
345 # define _elf_set_element(set, symbol) \
346 static const void *__elf_set_##set##_element_##symbol##__ \
347 __attribute__ ((unused, section (#set))) = &(symbol)
349 # define _elf_set_element(set, symbol) \
350 static const void *const __elf_set_##set##_element_##symbol##__ \
351 __attribute__ ((unused, section (#set))) = &(symbol)
354 /* Define SET as a symbol set. This may be required (it is in a.out) to
355 be able to use the set's contents. */
356 # define symbol_set_define(set) symbol_set_declare(set)
358 /* Declare SET for use in this module, if defined in another module.
359 In a shared library, this is always local to that shared object.
360 For static linking, the set might be wholly absent and so we use
362 # define symbol_set_declare(set) \
363 extern char const __start_##set[] __symbol_set_attribute; \
364 extern char const __stop_##set[] __symbol_set_attribute;
366 # define __symbol_set_attribute attribute_hidden
368 # define __symbol_set_attribute __attribute__ ((weak))
371 /* Return a pointer (void *const *) to the first element of SET. */
372 # define symbol_set_first_element(set) ((void *const *) (&__start_##set))
374 /* Return true iff PTR (a void *const *) has been incremented
375 past the last element in SET. */
376 # define symbol_set_end_p(set, ptr) ((ptr) >= (void *const *) &__stop_##set)
378 # else /* Not ELF: a.out. */
381 /* XCOFF does not support .stabs.
382 The native aix linker will remove the .stab and .stabstr sections
383 The gnu linker will have a fatal error if there is a relocation for
384 symbol in the .stab section. Silently disable these macros. */
385 # define text_set_element(set, symbol)
386 # define data_set_element(set, symbol)
387 # define bss_set_element(set, symbol)
389 # define text_set_element(set, symbol) \
390 asm (".stabs \"" __SYMBOL_PREFIX #set "\",23,0,0," __SYMBOL_PREFIX #symbol)
391 # define data_set_element(set, symbol) \
392 asm (".stabs \"" __SYMBOL_PREFIX #set "\",25,0,0," __SYMBOL_PREFIX #symbol)
393 # define bss_set_element(set, symbol) ?error Must use initialized data.
395 # define symbol_set_define(set) void *const (set)[1];
396 # define symbol_set_declare(set) extern void *const (set)[1];
398 # define symbol_set_first_element(set) &(set)[1]
399 # define symbol_set_end_p(set, ptr) (*(ptr) == 0)
403 /* We cannot do anything in generial. */
404 # define text_set_element(set, symbol) asm ("")
405 # define data_set_element(set, symbol) asm ("")
406 # define bss_set_element(set, symbol) asm ("")
407 # define symbol_set_define(set) void *const (set)[1];
408 # define symbol_set_declare(set) extern void *const (set)[1];
410 # define symbol_set_first_element(set) &(set)[1]
411 # define symbol_set_end_p(set, ptr) (*(ptr) == 0)
412 #endif /* Have GNU ld. */
415 # define symbol_version(real, name, version) \
416 _symbol_version(real, name, version)
417 # define default_symbol_version(real, name, version) \
418 _default_symbol_version(real, name, version)
419 # ifdef __ASSEMBLER__
420 # ifdef HAVE_ASM_GLOBAL_DOT_NAME
421 # define _symbol_version(real, name, version) \
422 .symver real, name##@##version ASM_LINE_SEP \
423 .symver .##real, .##name##@##version
424 # define _default_symbol_version(real, name, version) \
425 .symver real, name##@##@##version ASM_LINE_SEP \
426 .symver .##real, .##name##@##@##version
428 # define _symbol_version(real, name, version) \
429 .symver real, name##@##version
430 # define _default_symbol_version(real, name, version) \
431 .symver real, name##@##@##version
434 # ifdef HAVE_ASM_GLOBAL_DOT_NAME
435 # define _symbol_version(real, name, version) \
436 __asm__ (".symver " #real "," #name "@" #version "\n\t" \
437 ".symver ." #real ",." #name "@" #version)
438 # define _default_symbol_version(real, name, version) \
439 __asm__ (".symver " #real "," #name "@@" #version "\n\t" \
440 ".symver ." #real ",." #name "@@" #version)
442 # define _symbol_version(real, name, version) \
443 __asm__ (".symver " #real "," #name "@" #version)
444 # define _default_symbol_version(real, name, version) \
445 __asm__ (".symver " #real "," #name "@@" #version)
449 # define symbol_version(real, name, version)
450 # define default_symbol_version(real, name, version) \
451 strong_alias(real, name)
454 #if defined HAVE_VISIBILITY_ATTRIBUTE \
455 && (defined SHARED || defined LIBC_NONSHARED)
456 # define attribute_hidden __attribute__ ((visibility ("hidden")))
458 # define attribute_hidden
461 #if defined HAVE_TLS_MODEL_ATTRIBUTE
462 # define attribute_tls_model_ie __attribute__ ((tls_model ("initial-exec")))
464 # define attribute_tls_model_ie
467 /* Handling on non-exported internal names. We have to do this only
470 # define INTUSE(name) name##_internal
471 # define INTDEF(name) strong_alias (name, name##_internal)
472 # define INTVARDEF(name) \
473 _INTVARDEF (name, name##_internal)
474 # if defined HAVE_VISIBILITY_ATTRIBUTE
475 # define _INTVARDEF(name, aliasname) \
476 extern __typeof (name) aliasname __attribute__ ((alias (#name), \
477 visibility ("hidden")));
479 # define _INTVARDEF(name, aliasname) \
480 extern __typeof (name) aliasname __attribute__ ((alias (#name)));
482 # define INTDEF2(name, newname) strong_alias (name, newname##_internal)
483 # define INTVARDEF2(name, newname) _INTVARDEF (name, newname##_internal)
485 # define INTUSE(name) name
486 # define INTDEF(name)
487 # define INTVARDEF(name)
488 # define INTDEF2(name, newname)
489 # define INTVARDEF2(name, newname)
492 /* The following macros are used for PLT bypassing within libc.so
493 (and if needed other libraries similarly).
494 First of all, you need to have the function prototyped somewhere,
499 If calls to foo within libc.so should always go to foo defined in libc.so,
500 then in include/foo.h you add:
502 libc_hidden_proto (foo)
504 line and after the foo function definition:
510 libc_hidden_def (foo)
518 libc_hidden_weak (foo)
520 Simularly for global data. If references to foo within libc.so should
521 always go to foo defined in libc.so, then in include/foo.h you add:
523 libc_hidden_proto (foo)
525 line and after foo's definition:
527 int foo = INITIAL_FOO_VALUE;
528 libc_hidden_data_def (foo)
532 int foo = INITIAL_FOO_VALUE;
533 libc_hidden_data_weak (foo)
535 If foo is normally just an alias (strong or weak) of some other function,
536 you should use the normal strong_alias first, then add libc_hidden_def
543 strong_alias (baz, foo)
544 libc_hidden_weak (foo)
546 If the function should be internal to multiple objects, say ld.so and
547 libc.so, the best way is to use:
549 #if !defined NOT_IN_libc || defined IS_IN_rtld
553 in include/foo.h and the normal macros at all function definitions
554 depending on what DSO they belong to.
556 If versioned_symbol macro is used to define foo,
557 libc_hidden_ver macro should be used, as in:
559 int __real_foo (int __bar)
563 versioned_symbol (libc, __real_foo, foo, GLIBC_2_1);
564 libc_hidden_ver (__real_foo, foo) */
566 #if defined SHARED && defined DO_VERSIONING \
567 && !defined HAVE_BROKEN_ALIAS_ATTRIBUTE && !defined NO_HIDDEN
568 # ifndef __ASSEMBLER__
569 # if !defined HAVE_VISIBILITY_ATTRIBUTE \
570 || defined HAVE_BROKEN_VISIBILITY_ATTRIBUTE
571 # define __hidden_proto_hiddenattr(attrs...)
573 # define __hidden_proto_hiddenattr(attrs...) \
574 __attribute__ ((visibility ("hidden"), ##attrs))
576 # define hidden_proto(name, attrs...) \
577 __hidden_proto (name, __GI_##name, ##attrs)
578 # define __hidden_proto(name, internal, attrs...) \
579 extern __typeof (name) internal; \
580 extern __typeof (name) name __asm__ (__hidden_asmname (#internal)) \
581 __hidden_proto_hiddenattr (attrs);
582 # define __hidden_asmname(name) \
583 __hidden_asmname1 (__USER_LABEL_PREFIX__, name)
584 # define __hidden_asmname1(prefix, name) __hidden_asmname2(prefix, name)
585 # define __hidden_asmname2(prefix, name) #prefix name
586 # ifdef HAVE_ASM_SET_DIRECTIVE
587 # define __hidden_def1(original, alias) \
588 ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME (alias) ASM_LINE_SEP \
589 .set C_SYMBOL_NAME (alias), C_SYMBOL_NAME (original)
590 # ifdef HAVE_ASM_GLOBAL_DOT_NAME
591 # define __hidden_dot_def1(original, alias) ASM_LINE_SEP \
592 ASM_GLOBAL_DIRECTIVE C_SYMBOL_DOT_NAME (alias) ASM_LINE_SEP \
593 .set C_SYMBOL_DOT_NAME (alias), C_SYMBOL_DOT_NAME (original)
595 # define __hidden_dot_def1(original, alias)
598 # define __hidden_def1(original, alias) \
599 ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME (alias) ASM_LINE_SEP \
600 C_SYMBOL_NAME (alias) = C_SYMBOL_NAME (original)
601 # ifdef HAVE_ASM_GLOBAL_DOT_NAME
602 # define __hidden_dot_def1(original, alias) ASM_LINE_SEP \
603 ASM_GLOBAL_DIRECTIVE C_SYMBOL_DOT_NAME (alias) ASM_LINE_SEP \
604 C_SYMBOL_DOT_NAME (alias) = C_SYMBOL_DOT_NAME (original)
606 # define __hidden_dot_def1(original, alias)
609 # define __hidden_def2(...) #__VA_ARGS__
610 # define __hidden_def3(...) __hidden_def2 (__VA_ARGS__)
611 # define hidden_def(name) \
612 __asm__ (__hidden_def3 (__hidden_def1 (__GI_##name, name) \
613 __hidden_dot_def1 (__GI_##name, name)));
614 # define hidden_data_def(name) \
615 __asm__ (__hidden_def3 (__hidden_def1 (__GI_##name, name)));
616 # define hidden_ver(local, name) \
617 __asm__ (__hidden_def3 (__hidden_def1 (local, __GI_##name) \
618 __hidden_dot_def1 (local, __GI_##name)));
619 # define hidden_data_ver(local, name) \
620 __asm__ (__hidden_def3 (__hidden_def1 (local, __GI_##name)));
621 # ifdef HAVE_WEAK_SYMBOLS
622 # ifdef HAVE_ASM_WEAKEXT_DIRECTIVE
623 # define __hidden_weak1(original, alias) \
624 .weakext C_SYMBOL_NAME (alias), C_SYMBOL_NAME (original)
625 # ifdef HAVE_ASM_GLOBAL_DOT_NAME
626 # define __hidden_dot_weak1(original, alias) ASM_LINE_SEP \
627 .weakext C_SYMBOL_DOT_NAME (alias), C_SYMBOL_DOT_NAME (original)
629 # define __hidden_dot_weak1(original, alias)
631 # else /* ! HAVE_ASM_WEAKEXT_DIRECTIVE */
632 # define __hidden_weak1(original, alias) \
633 .weak C_SYMBOL_NAME (alias) ASM_LINE_SEP \
634 C_SYMBOL_NAME (alias) = C_SYMBOL_NAME (original)
635 # ifdef HAVE_ASM_GLOBAL_DOT_NAME
636 # define __hidden_dot_weak1(original, alias) ASM_LINE_SEP \
637 .weak C_SYMBOL_DOT_NAME (alias) ASM_LINE_SEP \
638 C_SYMBOL_DOT_NAME (alias) = C_SYMBOL_DOT_NAME (original)
640 # define __hidden_dot_weak1(original, alias)
643 # define hidden_weak(name) \
644 __asm__ (__hidden_def3 (__hidden_weak1 (__GI_##name, name) \
645 __hidden_dot_weak1 (__GI_##name, name)));
646 # define hidden_data_weak(name) \
647 __asm__ (__hidden_def3 (__hidden_weak1 (__GI_##name, name)));
649 # define hidden_weak(name) hidden_def (name)
652 /* For assembly, we need to do the opposite of what we do in C:
653 in assembly gcc __REDIRECT stuff is not in place, so functions
654 are defined by its normal name and we need to create the
655 __GI_* alias to it, in C __REDIRECT causes the function definition
656 to use __GI_* name and we need to add alias to the real name.
657 There is no reason to use hidden_weak over hidden_def in assembly,
658 but we provide it for consistency with the C usage.
659 hidden_proto doesn't make sense for assembly but the equivalent
660 is to call via the HIDDEN_JUMPTARGET macro instead of JUMPTARGET. */
661 # define hidden_def(name) strong_alias (name, __GI_##name)
662 # define hidden_weak(name) hidden_def (name)
663 # define hidden_ver(local, name) strong_alias (local, __GI_##name)
664 # define hidden_data_def(name) strong_data_alias (name, __GI_##name)
665 # define hidden_data_weak(name) hidden_data_def (name)
666 # define hidden_data_ver(local, name) strong_data_alias (local, __GI_##name)
667 # ifdef HAVE_ASM_GLOBAL_DOT_NAME
668 # define HIDDEN_JUMPTARGET(name) .__GI_##name
670 # define HIDDEN_JUMPTARGET(name) __GI_##name
674 # ifndef __ASSEMBLER__
675 # define hidden_proto(name, attrs...)
677 # define HIDDEN_JUMPTARGET(name) JUMPTARGET(name)
678 # endif /* Not __ASSEMBLER__ */
679 # define hidden_weak(name)
680 # define hidden_def(name)
681 # define hidden_ver(local, name)
682 # define hidden_data_weak(name)
683 # define hidden_data_def(name)
684 # define hidden_data_ver(local, name)
687 #if !defined NOT_IN_libc
688 # define libc_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
689 # define libc_hidden_def(name) hidden_def (name)
690 # define libc_hidden_weak(name) hidden_weak (name)
691 # define libc_hidden_ver(local, name) hidden_ver (local, name)
692 # define libc_hidden_data_def(name) hidden_data_def (name)
693 # define libc_hidden_data_weak(name) hidden_data_weak (name)
694 # define libc_hidden_data_ver(local, name) hidden_data_ver (local, name)
696 # define libc_hidden_proto(name, attrs...)
697 # define libc_hidden_def(name)
698 # define libc_hidden_weak(name)
699 # define libc_hidden_ver(local, name)
700 # define libc_hidden_data_def(name)
701 # define libc_hidden_data_weak(name)
702 # define libc_hidden_data_ver(local, name)
705 #if defined NOT_IN_libc && defined IS_IN_rtld
706 # define rtld_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
707 # define rtld_hidden_def(name) hidden_def (name)
708 # define rtld_hidden_weak(name) hidden_weak (name)
709 # define rtld_hidden_ver(local, name) hidden_ver (local, name)
710 # define rtld_hidden_data_def(name) hidden_data_def (name)
711 # define rtld_hidden_data_weak(name) hidden_data_weak (name)
712 # define rtld_hidden_data_ver(local, name) hidden_data_ver (local, name)
714 # define rtld_hidden_proto(name, attrs...)
715 # define rtld_hidden_def(name)
716 # define rtld_hidden_weak(name)
717 # define rtld_hidden_ver(local, name)
718 # define rtld_hidden_data_def(name)
719 # define rtld_hidden_data_weak(name)
720 # define rtld_hidden_data_ver(local, name)
723 #if defined NOT_IN_libc && defined IS_IN_libm
724 # define libm_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
725 # define libm_hidden_def(name) hidden_def (name)
726 # define libm_hidden_weak(name) hidden_weak (name)
727 # define libm_hidden_ver(local, name) hidden_ver (local, name)
728 # define libm_hidden_data_def(name) hidden_data_def (name)
729 # define libm_hidden_data_weak(name) hidden_data_weak (name)
730 # define libm_hidden_data_ver(local, name) hidden_data_ver (local, name)
732 # define libm_hidden_proto(name, attrs...)
733 # define libm_hidden_def(name)
734 # define libm_hidden_weak(name)
735 # define libm_hidden_ver(local, name)
736 # define libm_hidden_data_def(name)
737 # define libm_hidden_data_weak(name)
738 # define libm_hidden_data_ver(local, name)
741 #ifdef HAVE_BUILTIN_REDIRECTION
742 # define libc_hidden_builtin_proto(name, attrs...) libc_hidden_proto (name, ##attrs)
743 # define libc_hidden_builtin_def(name) libc_hidden_def (name)
744 # define libc_hidden_builtin_weak(name) libc_hidden_weak (name)
745 # define libc_hidden_builtin_ver(local, name) libc_hidden_ver (local, name)
747 # define libc_hidden_builtin_proto(name, attrs...)
748 # define libc_hidden_builtin_def(name)
749 # define libc_hidden_builtin_weak(name)
750 # define libc_hidden_builtin_ver(local, name)
753 #endif /* libc-symbols.h */