1 /* Specialized bits of code needed to support construction and
2 destruction of file-scope objects in C++ code.
3 Copyright (C) 1991, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001
4 2002, 2003, 2004, 2005, 2006, 2007, 2009, 2010, 2011
5 Free Software Foundation, Inc.
6 Contributed by Ron Guilmette (rfg@monkeys.com).
8 This file is part of GCC.
10 GCC is free software; you can redistribute it and/or modify it under
11 the terms of the GNU General Public License as published by the Free
12 Software Foundation; either version 3, or (at your option) any later
15 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
16 WARRANTY; without even the implied warranty of MERCHANTABILITY or
17 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
20 Under Section 7 of GPL version 3, you are granted additional
21 permissions described in the GCC Runtime Library Exception, version
22 3.1, as published by the Free Software Foundation.
24 You should have received a copy of the GNU General Public License and
25 a copy of the GCC Runtime Library Exception along with this program;
26 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
27 <http://www.gnu.org/licenses/>. */
29 /* This file is a bit like libgcc2.c in that it is compiled
30 multiple times and yields multiple .o files.
32 This file is useful on target machines where the object file format
33 supports multiple "user-defined" sections (e.g. COFF, ELF, ROSE). On
34 such systems, this file allows us to avoid running collect (or any
35 other such slow and painful kludge). Additionally, if the target
36 system supports a .init section, this file allows us to support the
37 linking of C++ code with a non-C++ main program.
39 Note that if INIT_SECTION_ASM_OP is defined in the tm.h file, then
40 this file *will* make use of the .init section. If that symbol is
41 not defined however, then the .init section will not be used.
43 Currently, only ELF and COFF are supported. It is likely however that
44 ROSE could also be supported, if someone was willing to do the work to
45 make whatever (small?) adaptations are needed. (Some work may be
46 needed on the ROSE assembler and linker also.)
48 This file must be compiled with gcc. */
50 /* Target machine header files require this define. */
53 /* FIXME: Including auto-host is incorrect, but until we have
54 identified the set of defines that need to go into auto-target.h,
55 this will have to do. */
56 #include "auto-host.h"
63 #include "coretypes.h"
65 #include "libgcc_tm.h"
66 #include "unwind-dw2-fde.h"
68 #ifndef FORCE_CODE_SECTION_ALIGN
69 # define FORCE_CODE_SECTION_ALIGN
72 #ifndef CRT_CALL_STATIC_FUNCTION
73 # define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC) \
74 static void __attribute__((__used__)) \
75 call_ ## FUNC (void) \
79 FORCE_CODE_SECTION_ALIGN \
80 asm (TEXT_SECTION_ASM_OP); \
84 #if defined(OBJECT_FORMAT_ELF) \
85 && !defined(OBJECT_FORMAT_FLAT) \
86 && defined(HAVE_LD_EH_FRAME_HDR) \
87 && !defined(inhibit_libc) && !defined(CRTSTUFFT_O) \
88 && defined(__FreeBSD__) && __FreeBSD__ >= 7
90 # define USE_PT_GNU_EH_FRAME
93 #if defined(OBJECT_FORMAT_ELF) \
94 && !defined(OBJECT_FORMAT_FLAT) \
95 && defined(HAVE_LD_EH_FRAME_HDR) && defined(TARGET_DL_ITERATE_PHDR) \
96 && !defined(inhibit_libc) && !defined(CRTSTUFFT_O) \
97 && defined(__sun__) && defined(__svr4__)
99 # define USE_PT_GNU_EH_FRAME
102 #if defined(OBJECT_FORMAT_ELF) \
103 && !defined(OBJECT_FORMAT_FLAT) \
104 && defined(HAVE_LD_EH_FRAME_HDR) \
105 && !defined(inhibit_libc) && !defined(CRTSTUFFT_O) \
106 && defined(__GLIBC__) && __GLIBC__ >= 2
108 /* uClibc pretends to be glibc 2.2 and DT_CONFIG is defined in its link.h.
109 But it doesn't use PT_GNU_EH_FRAME ELF segment currently. */
110 # if !defined(__UCLIBC__) \
111 && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2) \
112 || (__GLIBC__ == 2 && __GLIBC_MINOR__ == 2 && defined(DT_CONFIG)))
113 # define USE_PT_GNU_EH_FRAME
116 #if defined(EH_FRAME_SECTION_NAME) && !defined(USE_PT_GNU_EH_FRAME)
117 # define USE_EH_FRAME_REGISTRY
119 #if defined(EH_FRAME_SECTION_NAME) && EH_TABLES_CAN_BE_READ_ONLY
120 # define EH_FRAME_SECTION_CONST const
122 # define EH_FRAME_SECTION_CONST
125 #if !defined(DTOR_LIST_END) && defined(OBJECT_FORMAT_ELF) \
126 && defined(HAVE_GAS_HIDDEN) && !defined(FINI_ARRAY_SECTION_ASM_OP)
127 # define HIDDEN_DTOR_LIST_END
130 #if !defined(USE_TM_CLONE_REGISTRY) && defined(OBJECT_FORMAT_ELF)
131 # define USE_TM_CLONE_REGISTRY 1
134 /* We do not want to add the weak attribute to the declarations of these
135 routines in unwind-dw2-fde.h because that will cause the definition of
136 these symbols to be weak as well.
138 This exposes a core issue, how to handle creating weak references vs
139 how to create weak definitions. Either we have to have the definition
140 of TARGET_WEAK_ATTRIBUTE be conditional in the shared header files or
141 have a second declaration if we want a function's references to be weak,
142 but not its definition.
144 Making TARGET_WEAK_ATTRIBUTE conditional seems like a good solution until
145 one thinks about scaling to larger problems -- i.e., the condition under
146 which TARGET_WEAK_ATTRIBUTE is active will eventually get far too
149 So, we take an approach similar to #pragma weak -- we have a second
150 declaration for functions that we want to have weak references.
152 Neither way is particularly good. */
154 /* References to __register_frame_info and __deregister_frame_info should
155 be weak in this file if at all possible. */
156 extern void __register_frame_info (const void *, struct object *)
157 TARGET_ATTRIBUTE_WEAK;
158 extern void __register_frame_info_bases (const void *, struct object *,
160 TARGET_ATTRIBUTE_WEAK;
161 extern void *__deregister_frame_info (const void *)
162 TARGET_ATTRIBUTE_WEAK;
163 extern void *__deregister_frame_info_bases (const void *)
164 TARGET_ATTRIBUTE_WEAK;
165 extern void __do_global_ctors_1 (void);
167 /* Likewise for _Jv_RegisterClasses. */
168 extern void _Jv_RegisterClasses (void *) TARGET_ATTRIBUTE_WEAK;
170 /* Likewise for transactional memory clone tables. */
171 extern void _ITM_registerTMCloneTable (void *, size_t) TARGET_ATTRIBUTE_WEAK;
172 extern void _ITM_deregisterTMCloneTable (void *) TARGET_ATTRIBUTE_WEAK;
174 #ifdef OBJECT_FORMAT_ELF
176 /* Declare a pointer to void function type. */
177 typedef void (*func_ptr) (void);
178 #define STATIC static
180 #else /* OBJECT_FORMAT_ELF */
182 #include "gbl-ctors.h"
186 #endif /* OBJECT_FORMAT_ELF */
190 /* NOTE: In order to be able to support SVR4 shared libraries, we arrange
191 to have one set of symbols { __CTOR_LIST__, __DTOR_LIST__, __CTOR_END__,
192 __DTOR_END__ } per root executable and also one set of these symbols
193 per shared library. So in any given whole process image, we may have
194 multiple definitions of each of these symbols. In order to prevent
195 these definitions from conflicting with one another, and in order to
196 ensure that the proper lists are used for the initialization/finalization
197 of each individual shared library (respectively), we give these symbols
198 only internal (i.e. `static') linkage, and we also make it a point to
199 refer to only the __CTOR_END__ symbol in crtend.o and the __DTOR_LIST__
200 symbol in crtbegin.o, where they are defined. */
202 /* No need for .ctors/.dtors section if linker can place them in
203 .init_array/.fini_array section. */
204 #ifndef USE_INITFINI_ARRAY
205 /* The -1 is a flag to __do_global_[cd]tors indicating that this table
206 does not start with a count of elements. */
207 #ifdef CTOR_LIST_BEGIN
209 #elif defined(CTORS_SECTION_ASM_OP)
210 /* Hack: force cc1 to switch to .data section early, so that assembling
211 __CTOR_LIST__ does not undo our behind-the-back change to .ctors. */
212 static func_ptr force_to_data[1] __attribute__ ((__used__)) = { };
213 asm (CTORS_SECTION_ASM_OP);
214 STATIC func_ptr __CTOR_LIST__[1]
215 __attribute__ ((__used__, aligned(sizeof(func_ptr))))
216 = { (func_ptr) (-1) };
218 STATIC func_ptr __CTOR_LIST__[1]
219 __attribute__ ((__used__, section(".ctors"), aligned(sizeof(func_ptr))))
220 = { (func_ptr) (-1) };
221 #endif /* __CTOR_LIST__ alternatives */
223 #ifdef DTOR_LIST_BEGIN
225 #elif defined(DTORS_SECTION_ASM_OP)
226 asm (DTORS_SECTION_ASM_OP);
227 STATIC func_ptr __DTOR_LIST__[1]
228 __attribute__ ((aligned(sizeof(func_ptr))))
229 = { (func_ptr) (-1) };
231 STATIC func_ptr __DTOR_LIST__[1]
232 __attribute__((section(".dtors"), aligned(sizeof(func_ptr))))
233 = { (func_ptr) (-1) };
234 #endif /* __DTOR_LIST__ alternatives */
235 #endif /* USE_INITFINI_ARRAY */
237 #ifdef USE_EH_FRAME_REGISTRY
238 /* Stick a label at the beginning of the frame unwind info so we can register
239 and deregister it with the exception handling library code. */
240 STATIC EH_FRAME_SECTION_CONST char __EH_FRAME_BEGIN__[]
241 __attribute__((section(EH_FRAME_SECTION_NAME), aligned(4)))
243 #endif /* USE_EH_FRAME_REGISTRY */
245 #ifdef JCR_SECTION_NAME
246 /* Stick a label at the beginning of the java class registration info
247 so we can register them properly. */
248 STATIC void *__JCR_LIST__[]
249 __attribute__ ((used, section(JCR_SECTION_NAME), aligned(sizeof(void*))))
251 #endif /* JCR_SECTION_NAME */
253 #if USE_TM_CLONE_REGISTRY
254 STATIC func_ptr __TMC_LIST__[]
255 __attribute__((unused, section(".tm_clone_table"), aligned(sizeof(void*))))
257 extern func_ptr __TMC_END__[] __attribute__((__visibility__ ("hidden")));
258 #endif /* USE_TM_CLONE_REGISTRY */
260 #if defined(INIT_SECTION_ASM_OP) || defined(INIT_ARRAY_SECTION_ASM_OP)
262 #ifdef OBJECT_FORMAT_ELF
264 /* Declare the __dso_handle variable. It should have a unique value
265 in every shared-object; in a main program its value is zero. The
266 object should in any case be protected. This means the instance
267 in one DSO or the main program is not used in another object. The
268 dynamic linker takes care of this. */
270 #ifdef TARGET_LIBGCC_SDATA_SECTION
271 extern void *__dso_handle __attribute__ ((__section__ (TARGET_LIBGCC_SDATA_SECTION)));
273 #ifdef HAVE_GAS_HIDDEN
274 extern void *__dso_handle __attribute__ ((__visibility__ ("hidden")));
277 void *__dso_handle = &__dso_handle;
279 void *__dso_handle = 0;
282 /* The __cxa_finalize function may not be available so we use only a
284 extern void __cxa_finalize (void *) TARGET_ATTRIBUTE_WEAK;
286 /* Run all the global destructors on exit from the program. */
288 /* Some systems place the number of pointers in the first word of the
289 table. On SVR4 however, that word is -1. In all cases, the table is
290 null-terminated. On SVR4, we start from the beginning of the list and
291 invoke each per-compilation-unit destructor routine in order
292 until we find that null.
294 Note that this function MUST be static. There will be one of these
295 functions in each root executable and one in each shared library, but
296 although they all have the same code, each one is unique in that it
297 refers to one particular associated `__DTOR_LIST__' which belongs to the
298 same particular root executable or shared library file.
300 On some systems, this routine is run more than once from the .fini,
301 when exit is called recursively, so we arrange to remember where in
302 the list we left off processing, and we resume at that point,
303 should we be re-invoked. */
305 static void __attribute__((used))
306 __do_global_dtors_aux (void)
308 static _Bool completed;
310 if (__builtin_expect (completed, 0))
315 __cxa_finalize (__dso_handle);
318 #ifdef FINI_ARRAY_SECTION_ASM_OP
319 /* If we are using .fini_array then destructors will be run via that
321 #elif defined(HIDDEN_DTOR_LIST_END)
323 /* Safer version that makes sure only .dtors function pointers are
324 called even if the static variable is maliciously changed. */
325 extern func_ptr __DTOR_END__[] __attribute__((visibility ("hidden")));
326 static size_t dtor_idx;
327 const size_t max_idx = __DTOR_END__ - __DTOR_LIST__ - 1;
330 while (dtor_idx < max_idx)
332 f = __DTOR_LIST__[++dtor_idx];
336 #else /* !defined (FINI_ARRAY_SECTION_ASM_OP) */
338 static func_ptr *p = __DTOR_LIST__ + 1;
347 #endif /* !defined(FINI_ARRAY_SECTION_ASM_OP) */
349 #if USE_TM_CLONE_REGISTRY
350 if (__TMC_END__ - __TMC_LIST__ > 0)
352 void (*deregister_clones) (void *) = _ITM_deregisterTMCloneTable;
353 __asm ("" : "+r" (deregister_clones));
354 if (deregister_clones)
355 deregister_clones (__TMC_LIST__);
357 #endif /* USE_TM_CLONE_REGISTRY */
359 #ifdef USE_EH_FRAME_REGISTRY
360 #ifdef CRT_GET_RFIB_DATA
361 /* If we used the new __register_frame_info_bases interface,
362 make sure that we deregister from the same place. */
363 if (__deregister_frame_info_bases)
364 __deregister_frame_info_bases (__EH_FRAME_BEGIN__);
366 if (__deregister_frame_info)
367 __deregister_frame_info (__EH_FRAME_BEGIN__);
374 /* Stick a call to __do_global_dtors_aux into the .fini section. */
375 #ifdef FINI_SECTION_ASM_OP
376 CRT_CALL_STATIC_FUNCTION (FINI_SECTION_ASM_OP, __do_global_dtors_aux)
377 #elif defined (FINI_ARRAY_SECTION_ASM_OP)
378 static func_ptr __do_global_dtors_aux_fini_array_entry[]
379 __attribute__ ((__used__, section(".fini_array")))
380 = { __do_global_dtors_aux };
381 #else /* !FINI_SECTION_ASM_OP && !FINI_ARRAY_SECTION_ASM_OP */
382 static void __attribute__((used))
383 __do_global_dtors_aux_1 (void)
385 atexit (__do_global_dtors_aux);
387 CRT_CALL_STATIC_FUNCTION (INIT_SECTION_ASM_OP, __do_global_dtors_aux_1)
390 #if defined(USE_EH_FRAME_REGISTRY) \
391 || defined(JCR_SECTION_NAME) \
392 || defined(USE_TM_CLONE_REGISTRY)
393 /* Stick a call to __register_frame_info into the .init section. For some
394 reason calls with no arguments work more reliably in .init, so stick the
395 call in another function. */
397 static void __attribute__((used))
400 #ifdef USE_EH_FRAME_REGISTRY
401 static struct object object;
402 #ifdef CRT_GET_RFIB_DATA
405 CRT_GET_RFIB_DATA (dbase);
406 if (__register_frame_info_bases)
407 __register_frame_info_bases (__EH_FRAME_BEGIN__, &object, tbase, dbase);
409 if (__register_frame_info)
410 __register_frame_info (__EH_FRAME_BEGIN__, &object);
411 #endif /* CRT_GET_RFIB_DATA */
412 #endif /* USE_EH_FRAME_REGISTRY */
414 #ifdef JCR_SECTION_NAME
417 void (*register_classes) (void *) = _Jv_RegisterClasses;
418 __asm ("" : "+r" (register_classes));
419 if (register_classes)
420 register_classes (__JCR_LIST__);
422 #endif /* JCR_SECTION_NAME */
424 #if USE_TM_CLONE_REGISTRY
425 if (__TMC_END__ - __TMC_LIST__ > 0)
427 void (*register_clones) (void *, size_t) = _ITM_registerTMCloneTable;
428 __asm ("" : "+r" (register_clones));
431 size_t size = (size_t)(__TMC_END__ - __TMC_LIST__) / 2;
432 _ITM_registerTMCloneTable (__TMC_LIST__, size);
435 #endif /* USE_TM_CLONE_REGISTRY */
438 #ifdef INIT_SECTION_ASM_OP
439 CRT_CALL_STATIC_FUNCTION (INIT_SECTION_ASM_OP, frame_dummy)
440 #else /* defined(INIT_SECTION_ASM_OP) */
441 static func_ptr __frame_dummy_init_array_entry[]
442 __attribute__ ((__used__, section(".init_array")))
444 #endif /* !defined(INIT_SECTION_ASM_OP) */
445 #endif /* USE_EH_FRAME_REGISTRY || JCR_SECTION_NAME || USE_TM_CLONE_REGISTRY */
447 #else /* OBJECT_FORMAT_ELF */
449 /* The function __do_global_ctors_aux is compiled twice (once in crtbegin.o
450 and once in crtend.o). It must be declared static to avoid a link
451 error. Here, we define __do_global_ctors as an externally callable
452 function. It is externally callable so that __main can invoke it when
453 INVOKE__main is defined. This has the additional effect of forcing cc1
454 to switch to the .text section. */
456 static void __do_global_ctors_aux (void);
458 __do_global_ctors (void)
461 /* If __main won't actually call __do_global_ctors then it doesn't matter
462 what's inside the function. The inside of __do_global_ctors_aux is
463 called automatically in that case. And the Alliant fx2800 linker
464 crashes on this reference. So prevent the crash. */
465 __do_global_ctors_aux ();
469 asm (INIT_SECTION_ASM_OP); /* cc1 doesn't know that we are switching! */
471 /* A routine to invoke all of the global constructors upon entry to the
472 program. We put this into the .init section (for systems that have
473 such a thing) so that we can properly perform the construction of
474 file-scope static-storage C++ objects within shared libraries. */
476 static void __attribute__((used))
477 __do_global_ctors_aux (void) /* prologue goes in .init section */
479 FORCE_CODE_SECTION_ALIGN /* explicit align before switch to .text */
480 asm (TEXT_SECTION_ASM_OP); /* don't put epilogue and body in .init */
481 DO_GLOBAL_CTORS_BODY;
482 atexit (__do_global_dtors);
485 #endif /* OBJECT_FORMAT_ELF */
487 #elif defined(HAS_INIT_SECTION) /* ! INIT_SECTION_ASM_OP */
489 extern void __do_global_dtors (void);
491 /* This case is used by the Irix 6 port, which supports named sections but
492 not an SVR4-style .fini section. __do_global_dtors can be non-static
493 in this case because we protect it with -hidden_symbol. */
496 __do_global_dtors (void)
499 for (p = __DTOR_LIST__ + 1; (f = *p); p++)
502 #if USE_TM_CLONE_REGISTRY
503 if (__TMC_END__ - __TMC_LIST__ > 0)
505 void (*deregister_clones) (void *) = _ITM_deregisterTMCloneTable;
506 __asm ("" : "+r" (deregister_clones));
507 if (deregister_clones)
508 deregister_clones (__TMC_LIST__);
510 #endif /* USE_TM_CLONE_REGISTRY */
512 #ifdef USE_EH_FRAME_REGISTRY
513 if (__deregister_frame_info)
514 __deregister_frame_info (__EH_FRAME_BEGIN__);
518 #if defined(USE_EH_FRAME_REGISTRY) \
519 || defined(JCR_SECTION_NAME) \
520 || defined(USE_TM_CLONE_REGISTRY)
521 /* A helper function for __do_global_ctors, which is in crtend.o. Here
522 in crtbegin.o, we can reference a couple of symbols not visible there.
523 Plus, since we're before libgcc.a, we have no problems referencing
524 functions from there. */
526 __do_global_ctors_1(void)
528 #ifdef USE_EH_FRAME_REGISTRY
529 static struct object object;
530 if (__register_frame_info)
531 __register_frame_info (__EH_FRAME_BEGIN__, &object);
534 #ifdef JCR_SECTION_NAME
537 void (*register_classes) (void *) = _Jv_RegisterClasses;
538 __asm ("" : "+r" (register_classes));
539 if (register_classes)
540 register_classes (__JCR_LIST__);
544 #if USE_TM_CLONE_REGISTRY
545 if (__TMC_END__ - __TMC_LIST__ > 0)
547 void (*register_clones) (void *, size_t) = _ITM_registerTMCloneTable;
548 __asm ("" : "+r" (register_clones));
551 size_t size = (size_t)(__TMC_END__ - __TMC_LIST__) / 2;
552 register_clones (__TMC_LIST__, size);
555 #endif /* USE_TM_CLONE_REGISTRY */
557 #endif /* USE_EH_FRAME_REGISTRY || JCR_SECTION_NAME || USE_TM_CLONE_REGISTRY */
559 #else /* ! INIT_SECTION_ASM_OP && ! HAS_INIT_SECTION */
560 #error "What are you doing with crtstuff.c, then?"
563 #elif defined(CRT_END) /* ! CRT_BEGIN */
565 /* No need for .ctors/.dtors section if linker can place them in
566 .init_array/.fini_array section. */
567 #ifndef USE_INITFINI_ARRAY
568 /* Put a word containing zero at the end of each of our two lists of function
569 addresses. Note that the words defined here go into the .ctors and .dtors
570 sections of the crtend.o file, and since that file is always linked in
571 last, these words naturally end up at the very ends of the two lists
572 contained in these two sections. */
576 #elif defined(CTORS_SECTION_ASM_OP)
577 /* Hack: force cc1 to switch to .data section early, so that assembling
578 __CTOR_LIST__ does not undo our behind-the-back change to .ctors. */
579 static func_ptr force_to_data[1] __attribute__ ((__used__)) = { };
580 asm (CTORS_SECTION_ASM_OP);
581 STATIC func_ptr __CTOR_END__[1]
582 __attribute__((aligned(sizeof(func_ptr))))
585 STATIC func_ptr __CTOR_END__[1]
586 __attribute__((section(".ctors"), aligned(sizeof(func_ptr))))
592 #elif defined(HIDDEN_DTOR_LIST_END)
593 #ifdef DTORS_SECTION_ASM_OP
594 asm (DTORS_SECTION_ASM_OP);
596 func_ptr __DTOR_END__[1]
597 __attribute__ ((used,
598 #ifndef DTORS_SECTION_ASM_OP
601 aligned(sizeof(func_ptr)), visibility ("hidden")))
603 #elif defined(DTORS_SECTION_ASM_OP)
604 asm (DTORS_SECTION_ASM_OP);
605 STATIC func_ptr __DTOR_END__[1]
606 __attribute__ ((used, aligned(sizeof(func_ptr))))
609 STATIC func_ptr __DTOR_END__[1]
610 __attribute__((used, section(".dtors"), aligned(sizeof(func_ptr))))
613 #endif /* USE_INITFINI_ARRAY */
615 #ifdef EH_FRAME_SECTION_NAME
616 /* Terminate the frame unwind info section with a 4byte 0 as a sentinel;
617 this would be the 'length' field in a real FDE. */
618 # if __INT_MAX__ == 2147483647
620 # elif __LONG_MAX__ == 2147483647
622 # elif __SHRT_MAX__ == 2147483647
625 # error "Missing a 4 byte integer"
627 STATIC EH_FRAME_SECTION_CONST int32 __FRAME_END__[]
628 __attribute__ ((used, section(EH_FRAME_SECTION_NAME),
629 aligned(sizeof(int32))))
631 #endif /* EH_FRAME_SECTION_NAME */
633 #ifdef JCR_SECTION_NAME
634 /* Null terminate the .jcr section array. */
635 STATIC void *__JCR_END__[1]
636 __attribute__ ((used, section(JCR_SECTION_NAME),
637 aligned(sizeof(void *))))
639 #endif /* JCR_SECTION_NAME */
641 #if USE_TM_CLONE_REGISTRY
642 func_ptr __TMC_END__[]
643 __attribute__((unused, section(".tm_clone_table"), aligned(sizeof(void *)),
644 __visibility__ ("hidden")))
646 #endif /* USE_TM_CLONE_REGISTRY */
648 #ifdef INIT_ARRAY_SECTION_ASM_OP
650 /* If we are using .init_array, there is nothing to do. */
652 #elif defined(INIT_SECTION_ASM_OP)
654 #ifdef OBJECT_FORMAT_ELF
655 static void __attribute__((used))
656 __do_global_ctors_aux (void)
659 for (p = __CTOR_END__ - 1; *p != (func_ptr) -1; p--)
663 /* Stick a call to __do_global_ctors_aux into the .init section. */
664 CRT_CALL_STATIC_FUNCTION (INIT_SECTION_ASM_OP, __do_global_ctors_aux)
665 #else /* OBJECT_FORMAT_ELF */
667 /* Stick the real initialization code, followed by a normal sort of
668 function epilogue at the very end of the .init section for this
669 entire root executable file or for this entire shared library file.
671 Note that we use some tricks here to get *just* the body and just
672 a function epilogue (but no function prologue) into the .init
673 section of the crtend.o file. Specifically, we switch to the .text
674 section, start to define a function, and then we switch to the .init
675 section just before the body code.
677 Earlier on, we put the corresponding function prologue into the .init
678 section of the crtbegin.o file (which will be linked in first).
680 Note that we want to invoke all constructors for C++ file-scope static-
681 storage objects AFTER any other possible initialization actions which
682 may be performed by the code in the .init section contributions made by
683 other libraries, etc. That's because those other initializations may
684 include setup operations for very primitive things (e.g. initializing
685 the state of the floating-point coprocessor, etc.) which should be done
686 before we start to execute any of the user's code. */
689 __do_global_ctors_aux (void) /* prologue goes in .text section */
691 asm (INIT_SECTION_ASM_OP);
692 DO_GLOBAL_CTORS_BODY;
693 atexit (__do_global_dtors);
694 } /* epilogue and body go in .init section */
696 FORCE_CODE_SECTION_ALIGN
697 asm (TEXT_SECTION_ASM_OP);
699 #endif /* OBJECT_FORMAT_ELF */
701 #elif defined(HAS_INIT_SECTION) /* ! INIT_SECTION_ASM_OP */
703 extern void __do_global_ctors (void);
705 /* This case is used by the Irix 6 port, which supports named sections but
706 not an SVR4-style .init section. __do_global_ctors can be non-static
707 in this case because we protect it with -hidden_symbol. */
709 __do_global_ctors (void)
712 #if defined(USE_EH_FRAME_REGISTRY) \
713 || defined(JCR_SECTION_NAME) \
714 || defined(USE_TM_CLONE_REGISTRY)
715 __do_global_ctors_1();
717 for (p = __CTOR_END__ - 1; *p != (func_ptr) -1; p--)
721 #else /* ! INIT_SECTION_ASM_OP && ! HAS_INIT_SECTION */
722 #error "What are you doing with crtstuff.c, then?"
725 #else /* ! CRT_BEGIN && ! CRT_END */
726 #error "One of CRT_BEGIN or CRT_END must be defined."