summaryrefslogtreecommitdiff
path: root/libgcc/libgcov-merge.c
blob: f5be02cfd1ff61a59ddf22484f264dd24036c464 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
/* Routines required for instrumenting a program.  */
/* Compile this one with gcc.  */
/* Copyright (C) 1989-2017 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

#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_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_get_counter_target ();
      counter = gcov_get_counter ();
      all = gcov_get_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_icall_topn
/* The profile merging function used for merging indirect call counts
   This function is given array COUNTERS of N_COUNTERS old counters and it
   reads the same number of counters from the gcov file.  */

void
__gcov_merge_icall_topn (gcov_type *counters, unsigned n_counters)
{
  unsigned i, j, k, m;

  gcc_assert (!(n_counters % GCOV_ICALL_TOPN_NCOUNTS));
  for (i = 0; i < n_counters; i += GCOV_ICALL_TOPN_NCOUNTS)
    {
      gcov_type *value_array = &counters[i + 1];
      unsigned tmp_size = 2 * (GCOV_ICALL_TOPN_NCOUNTS - 1);
      gcov_type *tmp_array 
          = (gcov_type *) alloca (tmp_size * sizeof (gcov_type));

      for (j = 0; j < tmp_size; j++)
        tmp_array[j] = 0;

      for (j = 0; j < GCOV_ICALL_TOPN_NCOUNTS - 1; j += 2)
        {
          tmp_array[j] = value_array[j];
          tmp_array[j + 1] = value_array [j + 1];
        }

      /* Skip the number_of_eviction entry.  */
      gcov_get_counter ();
      for (k = 0; k < GCOV_ICALL_TOPN_NCOUNTS - 1; k += 2)
        {
          int found = 0;
          gcov_type global_id = gcov_get_counter_target ();
          gcov_type call_count = gcov_get_counter ();
          for (m = 0; m < j; m += 2)
            {
              if (tmp_array[m] == global_id)
                {
                  found = 1;
                  tmp_array[m + 1] += call_count;
                  break;
                }
            }
          if (!found)
            {
              tmp_array[j] = global_id;
              tmp_array[j + 1] = call_count;
              j += 2;
            }
        }
      /* Now sort the temp array */
      gcov_sort_n_vals (tmp_array, j);

      /* Now copy back the top half of the temp array */
      for (k = 0; k < GCOV_ICALL_TOPN_NCOUNTS - 1; k += 2)
        {
          value_array[k] = tmp_array[k];
          value_array[k + 1] = tmp_array[k + 1];
        }
    }
}
#endif /* L_gcov_merge_icall_topn */
#endif /* inhibit_libc */