1 | /* Copyright (C) 1996-2017 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. |
3 | Contributed by David Mosberger (davidm@cs.arizona.edu). |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the License, or (at your option) any later version. |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ |
18 | |
19 | /* __bb_init_func is invoked at the beginning of each function, before |
20 | any registers have been saved. This generic routine should work |
21 | provided that calling this function doesn't mangle the arguments |
22 | passed to the function being called. If that's not the case, a |
23 | system specific routine must be provided. */ |
24 | |
25 | #include <sys/types.h> |
26 | #include <sys/gmon.h> |
27 | |
28 | #include <stdlib.h> |
29 | |
30 | void |
31 | __bb_init_func (struct __bb *bb) |
32 | { |
33 | struct gmonparam *p = &_gmonparam; |
34 | |
35 | if (bb->zero_word != 0) |
36 | { |
37 | return; /* handle common case quickly */ |
38 | } |
39 | |
40 | /* insert this basic-block into basic-block list: */ |
41 | bb->zero_word = 1; |
42 | bb->next = __bb_head; |
43 | __bb_head = bb; |
44 | |
45 | if (bb->next == 0 && p->state != GMON_PROF_ON) |
46 | { |
47 | /* we didn't register _mcleanup yet and pc profiling doesn't seem |
48 | to be active, so let's register it now: */ |
49 | extern void *__dso_handle __attribute__ ((__weak__)); |
50 | __cxa_atexit ((void (*) (void *)) _mcleanup, NULL, |
51 | &__dso_handle ? __dso_handle : NULL); |
52 | } |
53 | } |
54 | |