Mercurial > hg > CbC > CbC_gcc
annotate gcc/crtstuff.c @ 55:77e2b8dfacca gcc-4.4.5
update it from 4.4.3 to 4.5.0
author | ryoma <e075725@ie.u-ryukyu.ac.jp> |
---|---|
date | Fri, 12 Feb 2010 23:39:51 +0900 |
parents | a06113de4d67 |
children | b7f97abdc517 |
rev | line source |
---|---|
0 | 1 /* Specialized bits of code needed to support construction and |
2 destruction of file-scope objects in C++ code. | |
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
3 Copyright (C) 1991, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001 |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
4 2002, 2003, 2004, 2005, 2006, 2007, 2009 Free Software Foundation, Inc. |
0 | 5 Contributed by Ron Guilmette (rfg@monkeys.com). |
6 | |
7 This file is part of GCC. | |
8 | |
9 GCC is free software; you can redistribute it and/or modify it under | |
10 the terms of the GNU General Public License as published by the Free | |
11 Software Foundation; either version 3, or (at your option) any later | |
12 version. | |
13 | |
14 GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
15 WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
17 for more details. | |
18 | |
19 Under Section 7 of GPL version 3, you are granted additional | |
20 permissions described in the GCC Runtime Library Exception, version | |
21 3.1, as published by the Free Software Foundation. | |
22 | |
23 You should have received a copy of the GNU General Public License and | |
24 a copy of the GCC Runtime Library Exception along with this program; | |
25 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
26 <http://www.gnu.org/licenses/>. */ | |
27 | |
28 /* This file is a bit like libgcc2.c in that it is compiled | |
29 multiple times and yields multiple .o files. | |
30 | |
31 This file is useful on target machines where the object file format | |
32 supports multiple "user-defined" sections (e.g. COFF, ELF, ROSE). On | |
33 such systems, this file allows us to avoid running collect (or any | |
34 other such slow and painful kludge). Additionally, if the target | |
35 system supports a .init section, this file allows us to support the | |
36 linking of C++ code with a non-C++ main program. | |
37 | |
38 Note that if INIT_SECTION_ASM_OP is defined in the tm.h file, then | |
39 this file *will* make use of the .init section. If that symbol is | |
40 not defined however, then the .init section will not be used. | |
41 | |
42 Currently, only ELF and COFF are supported. It is likely however that | |
43 ROSE could also be supported, if someone was willing to do the work to | |
44 make whatever (small?) adaptations are needed. (Some work may be | |
45 needed on the ROSE assembler and linker also.) | |
46 | |
47 This file must be compiled with gcc. */ | |
48 | |
49 /* Target machine header files require this define. */ | |
50 #define IN_LIBGCC2 | |
51 | |
52 /* FIXME: Including auto-host is incorrect, but until we have | |
53 identified the set of defines that need to go into auto-target.h, | |
54 this will have to do. */ | |
55 #include "auto-host.h" | |
56 #undef pid_t | |
57 #undef rlim_t | |
58 #undef ssize_t | |
59 #undef vfork | |
60 #include "tconfig.h" | |
61 #include "tsystem.h" | |
62 #include "coretypes.h" | |
63 #include "tm.h" | |
64 #include "unwind-dw2-fde.h" | |
65 | |
66 #ifndef FORCE_CODE_SECTION_ALIGN | |
67 # define FORCE_CODE_SECTION_ALIGN | |
68 #endif | |
69 | |
70 #ifndef CRT_CALL_STATIC_FUNCTION | |
71 # define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC) \ | |
72 static void __attribute__((__used__)) \ | |
73 call_ ## FUNC (void) \ | |
74 { \ | |
75 asm (SECTION_OP); \ | |
76 FUNC (); \ | |
77 FORCE_CODE_SECTION_ALIGN \ | |
78 asm (TEXT_SECTION_ASM_OP); \ | |
79 } | |
80 #endif | |
81 | |
82 #if defined(OBJECT_FORMAT_ELF) \ | |
83 && !defined(OBJECT_FORMAT_FLAT) \ | |
84 && defined(HAVE_LD_EH_FRAME_HDR) \ | |
85 && !defined(inhibit_libc) && !defined(CRTSTUFFT_O) \ | |
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
86 && defined(__FreeBSD__) && __FreeBSD__ >= 7 |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
87 #include <link.h> |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
88 # define USE_PT_GNU_EH_FRAME |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
89 #endif |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
90 |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
91 #if defined(OBJECT_FORMAT_ELF) \ |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
92 && !defined(OBJECT_FORMAT_FLAT) \ |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
93 && defined(HAVE_LD_EH_FRAME_HDR) \ |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
94 && !defined(inhibit_libc) && !defined(CRTSTUFFT_O) \ |
0 | 95 && defined(__GLIBC__) && __GLIBC__ >= 2 |
96 #include <link.h> | |
97 /* uClibc pretends to be glibc 2.2 and DT_CONFIG is defined in its link.h. | |
98 But it doesn't use PT_GNU_EH_FRAME ELF segment currently. */ | |
99 # if !defined(__UCLIBC__) \ | |
100 && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2) \ | |
101 || (__GLIBC__ == 2 && __GLIBC_MINOR__ == 2 && defined(DT_CONFIG))) | |
102 # define USE_PT_GNU_EH_FRAME | |
103 # endif | |
104 #endif | |
105 #if defined(EH_FRAME_SECTION_NAME) && !defined(USE_PT_GNU_EH_FRAME) | |
106 # define USE_EH_FRAME_REGISTRY | |
107 #endif | |
108 #if defined(EH_FRAME_SECTION_NAME) && EH_TABLES_CAN_BE_READ_ONLY | |
109 # define EH_FRAME_SECTION_CONST const | |
110 #else | |
111 # define EH_FRAME_SECTION_CONST | |
112 #endif | |
113 | |
114 #if !defined(DTOR_LIST_END) && defined(OBJECT_FORMAT_ELF) \ | |
115 && defined(HAVE_GAS_HIDDEN) && !defined(FINI_ARRAY_SECTION_ASM_OP) | |
116 # define HIDDEN_DTOR_LIST_END | |
117 #endif | |
118 | |
119 /* We do not want to add the weak attribute to the declarations of these | |
120 routines in unwind-dw2-fde.h because that will cause the definition of | |
121 these symbols to be weak as well. | |
122 | |
123 This exposes a core issue, how to handle creating weak references vs | |
124 how to create weak definitions. Either we have to have the definition | |
125 of TARGET_WEAK_ATTRIBUTE be conditional in the shared header files or | |
126 have a second declaration if we want a function's references to be weak, | |
127 but not its definition. | |
128 | |
129 Making TARGET_WEAK_ATTRIBUTE conditional seems like a good solution until | |
130 one thinks about scaling to larger problems -- i.e., the condition under | |
131 which TARGET_WEAK_ATTRIBUTE is active will eventually get far too | |
132 complicated. | |
133 | |
134 So, we take an approach similar to #pragma weak -- we have a second | |
135 declaration for functions that we want to have weak references. | |
136 | |
137 Neither way is particularly good. */ | |
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
138 |
0 | 139 /* References to __register_frame_info and __deregister_frame_info should |
140 be weak in this file if at all possible. */ | |
141 extern void __register_frame_info (const void *, struct object *) | |
142 TARGET_ATTRIBUTE_WEAK; | |
143 extern void __register_frame_info_bases (const void *, struct object *, | |
144 void *, void *) | |
145 TARGET_ATTRIBUTE_WEAK; | |
146 extern void *__deregister_frame_info (const void *) | |
147 TARGET_ATTRIBUTE_WEAK; | |
148 extern void *__deregister_frame_info_bases (const void *) | |
149 TARGET_ATTRIBUTE_WEAK; | |
150 extern void __do_global_ctors_1 (void); | |
151 | |
152 /* Likewise for _Jv_RegisterClasses. */ | |
153 extern void _Jv_RegisterClasses (void *) TARGET_ATTRIBUTE_WEAK; | |
154 | |
155 #ifdef OBJECT_FORMAT_ELF | |
156 | |
157 /* Declare a pointer to void function type. */ | |
158 typedef void (*func_ptr) (void); | |
159 #define STATIC static | |
160 | |
161 #else /* OBJECT_FORMAT_ELF */ | |
162 | |
163 #include "gbl-ctors.h" | |
164 | |
165 #define STATIC | |
166 | |
167 #endif /* OBJECT_FORMAT_ELF */ | |
168 | |
169 #ifdef CRT_BEGIN | |
170 | |
171 /* NOTE: In order to be able to support SVR4 shared libraries, we arrange | |
172 to have one set of symbols { __CTOR_LIST__, __DTOR_LIST__, __CTOR_END__, | |
173 __DTOR_END__ } per root executable and also one set of these symbols | |
174 per shared library. So in any given whole process image, we may have | |
175 multiple definitions of each of these symbols. In order to prevent | |
176 these definitions from conflicting with one another, and in order to | |
177 ensure that the proper lists are used for the initialization/finalization | |
178 of each individual shared library (respectively), we give these symbols | |
179 only internal (i.e. `static') linkage, and we also make it a point to | |
180 refer to only the __CTOR_END__ symbol in crtend.o and the __DTOR_LIST__ | |
181 symbol in crtbegin.o, where they are defined. */ | |
182 | |
183 /* The -1 is a flag to __do_global_[cd]tors indicating that this table | |
184 does not start with a count of elements. */ | |
185 #ifdef CTOR_LIST_BEGIN | |
186 CTOR_LIST_BEGIN; | |
187 #elif defined(CTORS_SECTION_ASM_OP) | |
188 /* Hack: force cc1 to switch to .data section early, so that assembling | |
189 __CTOR_LIST__ does not undo our behind-the-back change to .ctors. */ | |
190 static func_ptr force_to_data[1] __attribute__ ((__unused__)) = { }; | |
191 asm (CTORS_SECTION_ASM_OP); | |
192 STATIC func_ptr __CTOR_LIST__[1] | |
193 __attribute__ ((__unused__, aligned(sizeof(func_ptr)))) | |
194 = { (func_ptr) (-1) }; | |
195 #else | |
196 STATIC func_ptr __CTOR_LIST__[1] | |
197 __attribute__ ((__unused__, section(".ctors"), aligned(sizeof(func_ptr)))) | |
198 = { (func_ptr) (-1) }; | |
199 #endif /* __CTOR_LIST__ alternatives */ | |
200 | |
201 #ifdef DTOR_LIST_BEGIN | |
202 DTOR_LIST_BEGIN; | |
203 #elif defined(DTORS_SECTION_ASM_OP) | |
204 asm (DTORS_SECTION_ASM_OP); | |
205 STATIC func_ptr __DTOR_LIST__[1] | |
206 __attribute__ ((aligned(sizeof(func_ptr)))) | |
207 = { (func_ptr) (-1) }; | |
208 #else | |
209 STATIC func_ptr __DTOR_LIST__[1] | |
210 __attribute__((section(".dtors"), aligned(sizeof(func_ptr)))) | |
211 = { (func_ptr) (-1) }; | |
212 #endif /* __DTOR_LIST__ alternatives */ | |
213 | |
214 #ifdef USE_EH_FRAME_REGISTRY | |
215 /* Stick a label at the beginning of the frame unwind info so we can register | |
216 and deregister it with the exception handling library code. */ | |
217 STATIC EH_FRAME_SECTION_CONST char __EH_FRAME_BEGIN__[] | |
218 __attribute__((section(EH_FRAME_SECTION_NAME), aligned(4))) | |
219 = { }; | |
220 #endif /* USE_EH_FRAME_REGISTRY */ | |
221 | |
222 #ifdef JCR_SECTION_NAME | |
223 /* Stick a label at the beginning of the java class registration info | |
224 so we can register them properly. */ | |
225 STATIC void *__JCR_LIST__[] | |
226 __attribute__ ((unused, section(JCR_SECTION_NAME), aligned(sizeof(void*)))) | |
227 = { }; | |
228 #endif /* JCR_SECTION_NAME */ | |
229 | |
230 #if defined(INIT_SECTION_ASM_OP) || defined(INIT_ARRAY_SECTION_ASM_OP) | |
231 | |
232 #ifdef OBJECT_FORMAT_ELF | |
233 | |
234 /* Declare the __dso_handle variable. It should have a unique value | |
235 in every shared-object; in a main program its value is zero. The | |
236 object should in any case be protected. This means the instance | |
237 in one DSO or the main program is not used in another object. The | |
238 dynamic linker takes care of this. */ | |
239 | |
240 #ifdef TARGET_LIBGCC_SDATA_SECTION | |
241 extern void *__dso_handle __attribute__ ((__section__ (TARGET_LIBGCC_SDATA_SECTION))); | |
242 #endif | |
243 #ifdef HAVE_GAS_HIDDEN | |
244 extern void *__dso_handle __attribute__ ((__visibility__ ("hidden"))); | |
245 #endif | |
246 #ifdef CRTSTUFFS_O | |
247 void *__dso_handle = &__dso_handle; | |
248 #else | |
249 void *__dso_handle = 0; | |
250 #endif | |
251 | |
252 /* The __cxa_finalize function may not be available so we use only a | |
253 weak declaration. */ | |
254 extern void __cxa_finalize (void *) TARGET_ATTRIBUTE_WEAK; | |
255 | |
256 /* Run all the global destructors on exit from the program. */ | |
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
257 |
0 | 258 /* Some systems place the number of pointers in the first word of the |
259 table. On SVR4 however, that word is -1. In all cases, the table is | |
260 null-terminated. On SVR4, we start from the beginning of the list and | |
261 invoke each per-compilation-unit destructor routine in order | |
262 until we find that null. | |
263 | |
264 Note that this function MUST be static. There will be one of these | |
265 functions in each root executable and one in each shared library, but | |
266 although they all have the same code, each one is unique in that it | |
267 refers to one particular associated `__DTOR_LIST__' which belongs to the | |
268 same particular root executable or shared library file. | |
269 | |
270 On some systems, this routine is run more than once from the .fini, | |
271 when exit is called recursively, so we arrange to remember where in | |
272 the list we left off processing, and we resume at that point, | |
273 should we be re-invoked. */ | |
274 | |
275 static void __attribute__((used)) | |
276 __do_global_dtors_aux (void) | |
277 { | |
278 static _Bool completed; | |
279 | |
280 if (__builtin_expect (completed, 0)) | |
281 return; | |
282 | |
283 #ifdef CRTSTUFFS_O | |
284 if (__cxa_finalize) | |
285 __cxa_finalize (__dso_handle); | |
286 #endif | |
287 | |
288 #ifdef FINI_ARRAY_SECTION_ASM_OP | |
289 /* If we are using .fini_array then destructors will be run via that | |
290 mechanism. */ | |
291 #elif defined(HIDDEN_DTOR_LIST_END) | |
292 { | |
293 /* Safer version that makes sure only .dtors function pointers are | |
294 called even if the static variable is maliciously changed. */ | |
295 extern func_ptr __DTOR_END__[] __attribute__((visibility ("hidden"))); | |
296 static size_t dtor_idx; | |
297 const size_t max_idx = __DTOR_END__ - __DTOR_LIST__ - 1; | |
298 func_ptr f; | |
299 | |
300 while (dtor_idx < max_idx) | |
301 { | |
302 f = __DTOR_LIST__[++dtor_idx]; | |
303 f (); | |
304 } | |
305 } | |
306 #else /* !defined (FINI_ARRAY_SECTION_ASM_OP) */ | |
307 { | |
308 static func_ptr *p = __DTOR_LIST__ + 1; | |
309 func_ptr f; | |
310 | |
311 while ((f = *p)) | |
312 { | |
313 p++; | |
314 f (); | |
315 } | |
316 } | |
317 #endif /* !defined(FINI_ARRAY_SECTION_ASM_OP) */ | |
318 | |
319 #ifdef USE_EH_FRAME_REGISTRY | |
320 #ifdef CRT_GET_RFIB_DATA | |
321 /* If we used the new __register_frame_info_bases interface, | |
322 make sure that we deregister from the same place. */ | |
323 if (__deregister_frame_info_bases) | |
324 __deregister_frame_info_bases (__EH_FRAME_BEGIN__); | |
325 #else | |
326 if (__deregister_frame_info) | |
327 __deregister_frame_info (__EH_FRAME_BEGIN__); | |
328 #endif | |
329 #endif | |
330 | |
331 completed = 1; | |
332 } | |
333 | |
334 /* Stick a call to __do_global_dtors_aux into the .fini section. */ | |
335 #ifdef FINI_SECTION_ASM_OP | |
336 CRT_CALL_STATIC_FUNCTION (FINI_SECTION_ASM_OP, __do_global_dtors_aux) | |
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
337 #elif defined (FINI_ARRAY_SECTION_ASM_OP) |
0 | 338 static func_ptr __do_global_dtors_aux_fini_array_entry[] |
339 __attribute__ ((__unused__, section(".fini_array"))) | |
340 = { __do_global_dtors_aux }; | |
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
341 #else /* !FINI_SECTION_ASM_OP && !FINI_ARRAY_SECTION_ASM_OP */ |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
342 static void __attribute__((used)) |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
343 __do_global_dtors_aux_1 (void) |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
344 { |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
345 atexit (__do_global_dtors_aux); |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
346 } |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
347 CRT_CALL_STATIC_FUNCTION (INIT_SECTION_ASM_OP, __do_global_dtors_aux_1) |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
348 #endif |
0 | 349 |
350 #if defined(USE_EH_FRAME_REGISTRY) || defined(JCR_SECTION_NAME) | |
351 /* Stick a call to __register_frame_info into the .init section. For some | |
352 reason calls with no arguments work more reliably in .init, so stick the | |
353 call in another function. */ | |
354 | |
355 static void __attribute__((used)) | |
356 frame_dummy (void) | |
357 { | |
358 #ifdef USE_EH_FRAME_REGISTRY | |
359 static struct object object; | |
360 #ifdef CRT_GET_RFIB_DATA | |
361 void *tbase, *dbase; | |
362 tbase = 0; | |
363 CRT_GET_RFIB_DATA (dbase); | |
364 if (__register_frame_info_bases) | |
365 __register_frame_info_bases (__EH_FRAME_BEGIN__, &object, tbase, dbase); | |
366 #else | |
367 if (__register_frame_info) | |
368 __register_frame_info (__EH_FRAME_BEGIN__, &object); | |
369 #endif /* CRT_GET_RFIB_DATA */ | |
370 #endif /* USE_EH_FRAME_REGISTRY */ | |
371 #ifdef JCR_SECTION_NAME | |
372 if (__JCR_LIST__[0]) | |
373 { | |
374 void (*register_classes) (void *) = _Jv_RegisterClasses; | |
375 __asm ("" : "+r" (register_classes)); | |
376 if (register_classes) | |
377 register_classes (__JCR_LIST__); | |
378 } | |
379 #endif /* JCR_SECTION_NAME */ | |
380 } | |
381 | |
382 #ifdef INIT_SECTION_ASM_OP | |
383 CRT_CALL_STATIC_FUNCTION (INIT_SECTION_ASM_OP, frame_dummy) | |
384 #else /* defined(INIT_SECTION_ASM_OP) */ | |
385 static func_ptr __frame_dummy_init_array_entry[] | |
386 __attribute__ ((__unused__, section(".init_array"))) | |
387 = { frame_dummy }; | |
388 #endif /* !defined(INIT_SECTION_ASM_OP) */ | |
389 #endif /* USE_EH_FRAME_REGISTRY || JCR_SECTION_NAME */ | |
390 | |
391 #else /* OBJECT_FORMAT_ELF */ | |
392 | |
393 /* The function __do_global_ctors_aux is compiled twice (once in crtbegin.o | |
394 and once in crtend.o). It must be declared static to avoid a link | |
395 error. Here, we define __do_global_ctors as an externally callable | |
396 function. It is externally callable so that __main can invoke it when | |
397 INVOKE__main is defined. This has the additional effect of forcing cc1 | |
398 to switch to the .text section. */ | |
399 | |
400 static void __do_global_ctors_aux (void); | |
401 void | |
402 __do_global_ctors (void) | |
403 { | |
404 #ifdef INVOKE__main | |
405 /* If __main won't actually call __do_global_ctors then it doesn't matter | |
406 what's inside the function. The inside of __do_global_ctors_aux is | |
407 called automatically in that case. And the Alliant fx2800 linker | |
408 crashes on this reference. So prevent the crash. */ | |
409 __do_global_ctors_aux (); | |
410 #endif | |
411 } | |
412 | |
413 asm (INIT_SECTION_ASM_OP); /* cc1 doesn't know that we are switching! */ | |
414 | |
415 /* A routine to invoke all of the global constructors upon entry to the | |
416 program. We put this into the .init section (for systems that have | |
417 such a thing) so that we can properly perform the construction of | |
418 file-scope static-storage C++ objects within shared libraries. */ | |
419 | |
420 static void __attribute__((used)) | |
421 __do_global_ctors_aux (void) /* prologue goes in .init section */ | |
422 { | |
423 FORCE_CODE_SECTION_ALIGN /* explicit align before switch to .text */ | |
424 asm (TEXT_SECTION_ASM_OP); /* don't put epilogue and body in .init */ | |
425 DO_GLOBAL_CTORS_BODY; | |
426 atexit (__do_global_dtors); | |
427 } | |
428 | |
429 #endif /* OBJECT_FORMAT_ELF */ | |
430 | |
431 #elif defined(HAS_INIT_SECTION) /* ! INIT_SECTION_ASM_OP */ | |
432 | |
433 extern void __do_global_dtors (void); | |
434 | |
435 /* This case is used by the Irix 6 port, which supports named sections but | |
436 not an SVR4-style .fini section. __do_global_dtors can be non-static | |
437 in this case because we protect it with -hidden_symbol. */ | |
438 | |
439 void | |
440 __do_global_dtors (void) | |
441 { | |
442 func_ptr *p, f; | |
443 for (p = __DTOR_LIST__ + 1; (f = *p); p++) | |
444 f (); | |
445 | |
446 #ifdef USE_EH_FRAME_REGISTRY | |
447 if (__deregister_frame_info) | |
448 __deregister_frame_info (__EH_FRAME_BEGIN__); | |
449 #endif | |
450 } | |
451 | |
452 #if defined(USE_EH_FRAME_REGISTRY) || defined(JCR_SECTION_NAME) | |
453 /* A helper function for __do_global_ctors, which is in crtend.o. Here | |
454 in crtbegin.o, we can reference a couple of symbols not visible there. | |
455 Plus, since we're before libgcc.a, we have no problems referencing | |
456 functions from there. */ | |
457 void | |
458 __do_global_ctors_1(void) | |
459 { | |
460 #ifdef USE_EH_FRAME_REGISTRY | |
461 static struct object object; | |
462 if (__register_frame_info) | |
463 __register_frame_info (__EH_FRAME_BEGIN__, &object); | |
464 #endif | |
465 #ifdef JCR_SECTION_NAME | |
466 if (__JCR_LIST__[0]) | |
467 { | |
468 void (*register_classes) (void *) = _Jv_RegisterClasses; | |
469 __asm ("" : "+r" (register_classes)); | |
470 if (register_classes) | |
471 register_classes (__JCR_LIST__); | |
472 } | |
473 #endif | |
474 } | |
475 #endif /* USE_EH_FRAME_REGISTRY || JCR_SECTION_NAME */ | |
476 | |
477 #else /* ! INIT_SECTION_ASM_OP && ! HAS_INIT_SECTION */ | |
478 #error "What are you doing with crtstuff.c, then?" | |
479 #endif | |
480 | |
481 #elif defined(CRT_END) /* ! CRT_BEGIN */ | |
482 | |
483 /* Put a word containing zero at the end of each of our two lists of function | |
484 addresses. Note that the words defined here go into the .ctors and .dtors | |
485 sections of the crtend.o file, and since that file is always linked in | |
486 last, these words naturally end up at the very ends of the two lists | |
487 contained in these two sections. */ | |
488 | |
489 #ifdef CTOR_LIST_END | |
490 CTOR_LIST_END; | |
491 #elif defined(CTORS_SECTION_ASM_OP) | |
492 /* Hack: force cc1 to switch to .data section early, so that assembling | |
493 __CTOR_LIST__ does not undo our behind-the-back change to .ctors. */ | |
494 static func_ptr force_to_data[1] __attribute__ ((__unused__)) = { }; | |
495 asm (CTORS_SECTION_ASM_OP); | |
496 STATIC func_ptr __CTOR_END__[1] | |
497 __attribute__((aligned(sizeof(func_ptr)))) | |
498 = { (func_ptr) 0 }; | |
499 #else | |
500 STATIC func_ptr __CTOR_END__[1] | |
501 __attribute__((section(".ctors"), aligned(sizeof(func_ptr)))) | |
502 = { (func_ptr) 0 }; | |
503 #endif | |
504 | |
505 #ifdef DTOR_LIST_END | |
506 DTOR_LIST_END; | |
507 #elif defined(HIDDEN_DTOR_LIST_END) | |
508 #ifdef DTORS_SECTION_ASM_OP | |
509 asm (DTORS_SECTION_ASM_OP); | |
510 #endif | |
511 func_ptr __DTOR_END__[1] | |
512 __attribute__ ((unused, | |
513 #ifndef DTORS_SECTION_ASM_OP | |
514 section(".dtors"), | |
515 #endif | |
516 aligned(sizeof(func_ptr)), visibility ("hidden"))) | |
517 = { (func_ptr) 0 }; | |
518 #elif defined(DTORS_SECTION_ASM_OP) | |
519 asm (DTORS_SECTION_ASM_OP); | |
520 STATIC func_ptr __DTOR_END__[1] | |
521 __attribute__ ((unused, aligned(sizeof(func_ptr)))) | |
522 = { (func_ptr) 0 }; | |
523 #else | |
524 STATIC func_ptr __DTOR_END__[1] | |
525 __attribute__((unused, section(".dtors"), aligned(sizeof(func_ptr)))) | |
526 = { (func_ptr) 0 }; | |
527 #endif | |
528 | |
529 #ifdef EH_FRAME_SECTION_NAME | |
530 /* Terminate the frame unwind info section with a 4byte 0 as a sentinel; | |
531 this would be the 'length' field in a real FDE. */ | |
532 # if __INT_MAX__ == 2147483647 | |
533 typedef int int32; | |
534 # elif __LONG_MAX__ == 2147483647 | |
535 typedef long int32; | |
536 # elif __SHRT_MAX__ == 2147483647 | |
537 typedef short int32; | |
538 # else | |
539 # error "Missing a 4 byte integer" | |
540 # endif | |
541 STATIC EH_FRAME_SECTION_CONST int32 __FRAME_END__[] | |
542 __attribute__ ((unused, section(EH_FRAME_SECTION_NAME), | |
543 aligned(sizeof(int32)))) | |
544 = { 0 }; | |
545 #endif /* EH_FRAME_SECTION_NAME */ | |
546 | |
547 #ifdef JCR_SECTION_NAME | |
548 /* Null terminate the .jcr section array. */ | |
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
549 STATIC void *__JCR_END__[1] |
0 | 550 __attribute__ ((unused, section(JCR_SECTION_NAME), |
551 aligned(sizeof(void *)))) | |
552 = { 0 }; | |
553 #endif /* JCR_SECTION_NAME */ | |
554 | |
555 #ifdef INIT_ARRAY_SECTION_ASM_OP | |
556 | |
557 /* If we are using .init_array, there is nothing to do. */ | |
558 | |
559 #elif defined(INIT_SECTION_ASM_OP) | |
560 | |
561 #ifdef OBJECT_FORMAT_ELF | |
562 static void __attribute__((used)) | |
563 __do_global_ctors_aux (void) | |
564 { | |
565 func_ptr *p; | |
566 for (p = __CTOR_END__ - 1; *p != (func_ptr) -1; p--) | |
567 (*p) (); | |
568 } | |
569 | |
570 /* Stick a call to __do_global_ctors_aux into the .init section. */ | |
571 CRT_CALL_STATIC_FUNCTION (INIT_SECTION_ASM_OP, __do_global_ctors_aux) | |
572 #else /* OBJECT_FORMAT_ELF */ | |
573 | |
574 /* Stick the real initialization code, followed by a normal sort of | |
575 function epilogue at the very end of the .init section for this | |
576 entire root executable file or for this entire shared library file. | |
577 | |
578 Note that we use some tricks here to get *just* the body and just | |
579 a function epilogue (but no function prologue) into the .init | |
580 section of the crtend.o file. Specifically, we switch to the .text | |
581 section, start to define a function, and then we switch to the .init | |
582 section just before the body code. | |
583 | |
584 Earlier on, we put the corresponding function prologue into the .init | |
585 section of the crtbegin.o file (which will be linked in first). | |
586 | |
587 Note that we want to invoke all constructors for C++ file-scope static- | |
588 storage objects AFTER any other possible initialization actions which | |
589 may be performed by the code in the .init section contributions made by | |
590 other libraries, etc. That's because those other initializations may | |
591 include setup operations for very primitive things (e.g. initializing | |
592 the state of the floating-point coprocessor, etc.) which should be done | |
593 before we start to execute any of the user's code. */ | |
594 | |
595 static void | |
596 __do_global_ctors_aux (void) /* prologue goes in .text section */ | |
597 { | |
598 asm (INIT_SECTION_ASM_OP); | |
599 DO_GLOBAL_CTORS_BODY; | |
600 atexit (__do_global_dtors); | |
601 } /* epilogue and body go in .init section */ | |
602 | |
603 FORCE_CODE_SECTION_ALIGN | |
604 asm (TEXT_SECTION_ASM_OP); | |
605 | |
606 #endif /* OBJECT_FORMAT_ELF */ | |
607 | |
608 #elif defined(HAS_INIT_SECTION) /* ! INIT_SECTION_ASM_OP */ | |
609 | |
610 extern void __do_global_ctors (void); | |
611 | |
612 /* This case is used by the Irix 6 port, which supports named sections but | |
613 not an SVR4-style .init section. __do_global_ctors can be non-static | |
614 in this case because we protect it with -hidden_symbol. */ | |
615 void | |
616 __do_global_ctors (void) | |
617 { | |
618 func_ptr *p; | |
619 #if defined(USE_EH_FRAME_REGISTRY) || defined(JCR_SECTION_NAME) | |
620 __do_global_ctors_1(); | |
621 #endif | |
622 for (p = __CTOR_END__ - 1; *p != (func_ptr) -1; p--) | |
623 (*p) (); | |
624 } | |
625 | |
626 #else /* ! INIT_SECTION_ASM_OP && ! HAS_INIT_SECTION */ | |
627 #error "What are you doing with crtstuff.c, then?" | |
628 #endif | |
629 | |
630 #else /* ! CRT_BEGIN && ! CRT_END */ | |
631 #error "One of CRT_BEGIN or CRT_END must be defined." | |
632 #endif |