gcc/libgcc/libgcov-interface.c

318 lines
7.1 KiB
C

/* Routines required for instrumenting a program. */
/* Compile this one with gcc. */
/* Copyright (C) 1989-2018 Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.
GCC 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 General Public License
for more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
#include "libgcov.h"
#include "gthr.h"
#if defined(inhibit_libc)
#ifdef L_gcov_flush
void __gcov_flush (void) {}
#endif
#ifdef L_gcov_reset
void __gcov_reset (void) {}
#endif
#ifdef L_gcov_dump
void __gcov_dump (void) {}
#endif
#else
/* Some functions we want to bind in this dynamic object, but have an
overridable global alias. Unfortunately not all targets support
aliases, so we just have a forwarding function. That'll be tail
called, so the cost is a single jump instruction.*/
#define ALIAS_void_fn(src,dst) \
void dst (void) \
{ src (); }
extern __gthread_mutex_t __gcov_flush_mx ATTRIBUTE_HIDDEN;
extern __gthread_mutex_t __gcov_flush_mx ATTRIBUTE_HIDDEN;
#ifdef L_gcov_flush
#ifdef __GTHREAD_MUTEX_INIT
__gthread_mutex_t __gcov_flush_mx = __GTHREAD_MUTEX_INIT;
#define init_mx_once()
#else
__gthread_mutex_t __gcov_flush_mx;
static void
init_mx (void)
{
__GTHREAD_MUTEX_INIT_FUNCTION (&__gcov_flush_mx);
}
static void
init_mx_once (void)
{
static __gthread_once_t once = __GTHREAD_ONCE_INIT;
__gthread_once (&once, init_mx);
}
#endif
/* Called before fork or exec - write out profile information gathered so
far and reset it to zero. This avoids duplication or loss of the
profile information gathered so far. */
void
__gcov_flush (void)
{
init_mx_once ();
__gthread_mutex_lock (&__gcov_flush_mx);
__gcov_dump_int ();
__gcov_reset_int ();
__gthread_mutex_unlock (&__gcov_flush_mx);
}
#endif /* L_gcov_flush */
#ifdef L_gcov_reset
/* Reset all counters to zero. */
static void
gcov_clear (const struct gcov_info *list)
{
const struct gcov_info *gi_ptr;
for (gi_ptr = list; gi_ptr; gi_ptr = gi_ptr->next)
{
unsigned f_ix;
for (f_ix = 0; f_ix < gi_ptr->n_functions; f_ix++)
{
unsigned t_ix;
const struct gcov_fn_info *gfi_ptr = gi_ptr->functions[f_ix];
if (!gfi_ptr || gfi_ptr->key != gi_ptr)
continue;
const struct gcov_ctr_info *ci_ptr = gfi_ptr->ctrs;
for (t_ix = 0; t_ix != GCOV_COUNTERS; t_ix++)
{
if (!gi_ptr->merge[t_ix])
continue;
memset (ci_ptr->values, 0, sizeof (gcov_type) * ci_ptr->num);
ci_ptr++;
}
}
}
}
/* Function that can be called from application to reset counters to zero,
in order to collect profile in region of interest. */
void
__gcov_reset_int (void)
{
struct gcov_root *root;
/* If we're compatible with the master, iterate over everything,
otherise just do us. */
for (root = __gcov_master.version == GCOV_VERSION
? __gcov_master.root : &__gcov_root; root; root = root->next)
{
gcov_clear (root->list);
root->dumped = 0;
}
}
ALIAS_void_fn (__gcov_reset_int, __gcov_reset);
#endif /* L_gcov_reset */
#ifdef L_gcov_dump
/* Function that can be called from application to write profile collected
so far, in order to collect profile in region of interest. */
void
__gcov_dump_int (void)
{
struct gcov_root *root;
/* If we're compatible with the master, iterate over everything,
otherise just do us. */
for (root = __gcov_master.version == GCOV_VERSION
? __gcov_master.root : &__gcov_root; root; root = root->next)
__gcov_dump_one (root);
}
ALIAS_void_fn (__gcov_dump_int, __gcov_dump);
#endif /* L_gcov_dump */
#ifdef L_gcov_fork
/* A wrapper for the fork function. Flushes the accumulated profiling data, so
that they are not counted twice. */
pid_t
__gcov_fork (void)
{
pid_t pid;
__gcov_flush ();
pid = fork ();
if (pid == 0)
__GTHREAD_MUTEX_INIT_FUNCTION (&__gcov_flush_mx);
return pid;
}
#endif
#ifdef L_gcov_execl
/* A wrapper for the execl function. Flushes the accumulated
profiling data, so that they are not lost. */
int
__gcov_execl (const char *path, char *arg, ...)
{
va_list ap, aq;
unsigned i, length;
char **args;
__gcov_flush ();
va_start (ap, arg);
va_copy (aq, ap);
length = 2;
while (va_arg (ap, char *))
length++;
va_end (ap);
args = (char **) alloca (length * sizeof (void *));
args[0] = arg;
for (i = 1; i < length; i++)
args[i] = va_arg (aq, char *);
va_end (aq);
return execv (path, args);
}
#endif
#ifdef L_gcov_execlp
/* A wrapper for the execlp function. Flushes the accumulated
profiling data, so that they are not lost. */
int
__gcov_execlp (const char *path, char *arg, ...)
{
va_list ap, aq;
unsigned i, length;
char **args;
__gcov_flush ();
va_start (ap, arg);
va_copy (aq, ap);
length = 2;
while (va_arg (ap, char *))
length++;
va_end (ap);
args = (char **) alloca (length * sizeof (void *));
args[0] = arg;
for (i = 1; i < length; i++)
args[i] = va_arg (aq, char *);
va_end (aq);
return execvp (path, args);
}
#endif
#ifdef L_gcov_execle
/* A wrapper for the execle function. Flushes the accumulated
profiling data, so that they are not lost. */
int
__gcov_execle (const char *path, char *arg, ...)
{
va_list ap, aq;
unsigned i, length;
char **args;
char **envp;
__gcov_flush ();
va_start (ap, arg);
va_copy (aq, ap);
length = 2;
while (va_arg (ap, char *))
length++;
va_end (ap);
args = (char **) alloca (length * sizeof (void *));
args[0] = arg;
for (i = 1; i < length; i++)
args[i] = va_arg (aq, char *);
envp = va_arg (aq, char **);
va_end (aq);
return execve (path, args, envp);
}
#endif
#ifdef L_gcov_execv
/* A wrapper for the execv function. Flushes the accumulated
profiling data, so that they are not lost. */
int
__gcov_execv (const char *path, char *const argv[])
{
__gcov_flush ();
return execv (path, argv);
}
#endif
#ifdef L_gcov_execvp
/* A wrapper for the execvp function. Flushes the accumulated
profiling data, so that they are not lost. */
int
__gcov_execvp (const char *path, char *const argv[])
{
__gcov_flush ();
return execvp (path, argv);
}
#endif
#ifdef L_gcov_execve
/* A wrapper for the execve function. Flushes the accumulated
profiling data, so that they are not lost. */
int
__gcov_execve (const char *path, char *const argv[], char *const envp[])
{
__gcov_flush ();
return execve (path, argv, envp);
}
#endif
#endif /* inhibit_libc */