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glibc/gmon/bb_init_func.c
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/* Copyright (C) 1996-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
Contributed by David Mosberger (davidm@cs.arizona.edu). | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
/* __bb_init_func is invoked at the beginning of each function, before | |
any registers have been saved. This generic routine should work | |
provided that calling this function doesn't mangle the arguments | |
passed to the function being called. If that's not the case, a | |
system specific routine must be provided. */ | |
#include <sys/types.h> | |
#include <sys/gmon.h> | |
#include <stdlib.h> | |
void | |
__bb_init_func (struct __bb *bb) | |
{ | |
struct gmonparam *p = &_gmonparam; | |
if (bb->zero_word != 0) | |
{ | |
return; /* handle common case quickly */ | |
} | |
/* insert this basic-block into basic-block list: */ | |
bb->zero_word = 1; | |
bb->next = __bb_head; | |
__bb_head = bb; | |
if (bb->next == 0 && p->state != GMON_PROF_ON) | |
{ | |
/* we didn't register _mcleanup yet and pc profiling doesn't seem | |
to be active, so let's register it now: */ | |
extern void *__dso_handle __attribute__ ((__weak__)); | |
__cxa_atexit ((void (*) (void *)) _mcleanup, NULL, | |
&__dso_handle ? __dso_handle : NULL); | |
} | |
} |