blob: 774f2886ff6ab05edcfca1ee522206d7ca811d0b [file] [log] [blame]
/* Routines required for instrumenting a program. */
/* Compile this one with gcc. */
/* Copyright (C) 1989-2024 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"
#if defined(inhibit_libc)
/* If libc and its header files are not available, provide dummy functions. */
#ifdef L_gcov_merge_add
void __gcov_merge_add (gcov_type *counters __attribute__ ((unused)),
unsigned n_counters __attribute__ ((unused))) {}
#endif
#ifdef L_gcov_merge_topn
void __gcov_merge_topn (gcov_type *counters __attribute__ ((unused)),
unsigned n_counters __attribute__ ((unused))) {}
#endif
#else
#ifdef L_gcov_merge_add
/* The profile merging function that just adds the counters. It is given
an array COUNTERS of N_COUNTERS old counters and it reads the same number
of counters from the gcov file. */
void
__gcov_merge_add (gcov_type *counters, unsigned n_counters)
{
for (; n_counters; counters++, n_counters--)
*counters += gcov_get_counter ();
}
#endif /* L_gcov_merge_add */
#ifdef L_gcov_merge_ior
/* The profile merging function that just adds the counters. It is given
an array COUNTERS of N_COUNTERS old counters and it reads the same number
of counters from the gcov file. */
void
__gcov_merge_ior (gcov_type *counters, unsigned n_counters)
{
for (; n_counters; counters++, n_counters--)
*counters |= gcov_get_counter_target ();
}
#endif
#ifdef L_gcov_merge_time_profile
/* Time profiles are merged so that minimum from all valid (greater than zero)
is stored. There could be a fork that creates new counters. To have
the profile stable, we chosen to pick the smallest function visit time. */
void
__gcov_merge_time_profile (gcov_type *counters, unsigned n_counters)
{
unsigned int i;
gcov_type value;
for (i = 0; i < n_counters; i++)
{
value = gcov_get_counter_target ();
if (value && (!counters[i] || value < counters[i]))
counters[i] = value;
}
}
#endif /* L_gcov_merge_time_profile */
#ifdef L_gcov_merge_topn
/* The profile merging function for choosing the most common value.
It is given an array COUNTERS of N_COUNTERS old counters and it
reads the same number of counters from the gcov file. The counters
are split into pairs where the members of the tuple have
meanings:
-- the stored candidate on the most common value of the measured entity
-- counter
We use -TOTAL for situation when merging dropped some values.
The information is used for -fprofile-reproducible flag.
*/
void
__gcov_merge_topn (gcov_type *counters, unsigned n_counters)
{
gcc_assert (!(n_counters % GCOV_TOPN_MEM_COUNTERS));
for (unsigned i = 0; i < (n_counters / GCOV_TOPN_MEM_COUNTERS); i++)
{
/* First value is number of total executions of the profiler. */
gcov_type all = gcov_get_counter_ignore_scaling (-1);
gcov_type n = gcov_get_counter_ignore_scaling (-1);
unsigned full = all < 0;
gcov_type *total = &counters[GCOV_TOPN_MEM_COUNTERS * i];
*total += full ? -all : all;
for (unsigned j = 0; j < n; j++)
{
gcov_type value = gcov_get_counter_target ();
gcov_type count = gcov_get_counter_ignore_scaling (-1);
// TODO: we should use atomic here
full |= gcov_topn_add_value (counters + GCOV_TOPN_MEM_COUNTERS * i,
value, count, 0, 0);
}
if (full)
*total = -(*total);
}
}
#endif /* L_gcov_merge_topn */
#endif /* inhibit_libc */