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/* Routines required for instrumenting a program. */
/* Compile this one with gcc. */
/* Copyright (C) 1989-2014 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_single
void __gcov_merge_single (gcov_type *counters __attribute__ ((unused)),
unsigned n_counters __attribute__ ((unused))) {}
#endif
#ifdef L_gcov_merge_delta
void __gcov_merge_delta (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_read_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_read_counter ();
}
#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_read_counter ();
if (value && (!counters[i] || value < counters[i]))
counters[i] = value;
}
}
#endif /* L_gcov_merge_time_profile */
#ifdef L_gcov_merge_single
/* 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 3-tuples where the members of the tuple have
meanings:
-- the stored candidate on the most common value of the measured entity
-- counter
-- total number of evaluations of the value */
void
__gcov_merge_single (gcov_type *counters, unsigned n_counters)
{
unsigned i, n_measures;
gcov_type value, counter, all;
gcc_assert (!(n_counters % 3));
n_measures = n_counters / 3;
for (i = 0; i < n_measures; i++, counters += 3)
{
value = gcov_read_counter ();
counter = gcov_read_counter ();
all = gcov_read_counter ();
if (counters[0] == value)
counters[1] += counter;
else if (counter > counters[1])
{
counters[0] = value;
counters[1] = counter - counters[1];
}
else
counters[1] -= counter;
counters[2] += all;
}
}
#endif /* L_gcov_merge_single */
#ifdef L_gcov_merge_delta
/* The profile merging function for choosing the most common
difference between two consecutive evaluations of the 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 4-tuples where the members of the tuple have meanings:
-- the last value of the measured entity
-- the stored candidate on the most common difference
-- counter
-- total number of evaluations of the value */
void
__gcov_merge_delta (gcov_type *counters, unsigned n_counters)
{
unsigned i, n_measures;
gcov_type value, counter, all;
gcc_assert (!(n_counters % 4));
n_measures = n_counters / 4;
for (i = 0; i < n_measures; i++, counters += 4)
{
/* last = */ gcov_read_counter ();
value = gcov_read_counter ();
counter = gcov_read_counter ();
all = gcov_read_counter ();
if (counters[1] == value)
counters[2] += counter;
else if (counter > counters[2])
{
counters[1] = value;
counters[2] = counter - counters[2];
}
else
counters[2] -= counter;
counters[3] += all;
}
}
#endif /* L_gcov_merge_delta */
#endif /* inhibit_libc */
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