111
|
1 /* Routines required for instrumenting a program. */
|
|
2 /* Compile this one with gcc. */
|
145
|
3 /* Copyright (C) 1989-2020 Free Software Foundation, Inc.
|
111
|
4
|
|
5 This file is part of GCC.
|
|
6
|
|
7 GCC is free software; you can redistribute it and/or modify it under
|
|
8 the terms of the GNU General Public License as published by the Free
|
|
9 Software Foundation; either version 3, or (at your option) any later
|
|
10 version.
|
|
11
|
|
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
|
|
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
|
15 for more details.
|
|
16
|
|
17 Under Section 7 of GPL version 3, you are granted additional
|
|
18 permissions described in the GCC Runtime Library Exception, version
|
|
19 3.1, as published by the Free Software Foundation.
|
|
20
|
|
21 You should have received a copy of the GNU General Public License and
|
|
22 a copy of the GCC Runtime Library Exception along with this program;
|
|
23 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
|
|
24 <http://www.gnu.org/licenses/>. */
|
|
25
|
|
26 #include "libgcov.h"
|
|
27
|
|
28 #if defined(inhibit_libc)
|
|
29 /* If libc and its header files are not available, provide dummy functions. */
|
|
30
|
|
31 #ifdef L_gcov_merge_add
|
|
32 void __gcov_merge_add (gcov_type *counters __attribute__ ((unused)),
|
|
33 unsigned n_counters __attribute__ ((unused))) {}
|
|
34 #endif
|
|
35
|
145
|
36 #ifdef L_gcov_merge_topn
|
|
37 void __gcov_merge_topn (gcov_type *counters __attribute__ ((unused)),
|
|
38 unsigned n_counters __attribute__ ((unused))) {}
|
111
|
39 #endif
|
|
40
|
|
41 #else
|
|
42
|
|
43 #ifdef L_gcov_merge_add
|
|
44 /* The profile merging function that just adds the counters. It is given
|
|
45 an array COUNTERS of N_COUNTERS old counters and it reads the same number
|
|
46 of counters from the gcov file. */
|
|
47 void
|
|
48 __gcov_merge_add (gcov_type *counters, unsigned n_counters)
|
|
49 {
|
|
50 for (; n_counters; counters++, n_counters--)
|
|
51 *counters += gcov_get_counter ();
|
|
52 }
|
|
53 #endif /* L_gcov_merge_add */
|
|
54
|
|
55 #ifdef L_gcov_merge_ior
|
|
56 /* The profile merging function that just adds the counters. It is given
|
|
57 an array COUNTERS of N_COUNTERS old counters and it reads the same number
|
|
58 of counters from the gcov file. */
|
|
59 void
|
|
60 __gcov_merge_ior (gcov_type *counters, unsigned n_counters)
|
|
61 {
|
|
62 for (; n_counters; counters++, n_counters--)
|
|
63 *counters |= gcov_get_counter_target ();
|
|
64 }
|
|
65 #endif
|
|
66
|
|
67 #ifdef L_gcov_merge_time_profile
|
|
68 /* Time profiles are merged so that minimum from all valid (greater than zero)
|
|
69 is stored. There could be a fork that creates new counters. To have
|
|
70 the profile stable, we chosen to pick the smallest function visit time. */
|
|
71 void
|
|
72 __gcov_merge_time_profile (gcov_type *counters, unsigned n_counters)
|
|
73 {
|
|
74 unsigned int i;
|
|
75 gcov_type value;
|
|
76
|
|
77 for (i = 0; i < n_counters; i++)
|
|
78 {
|
|
79 value = gcov_get_counter_target ();
|
|
80
|
|
81 if (value && (!counters[i] || value < counters[i]))
|
|
82 counters[i] = value;
|
|
83 }
|
|
84 }
|
|
85 #endif /* L_gcov_merge_time_profile */
|
|
86
|
145
|
87 #ifdef L_gcov_merge_topn
|
|
88
|
|
89 static void
|
|
90 merge_topn_values_set (gcov_type *counters)
|
|
91 {
|
|
92 /* First value is number of total executions of the profiler. */
|
|
93 gcov_type all = gcov_get_counter_ignore_scaling (-1);
|
|
94 counters[0] += all;
|
|
95 ++counters;
|
|
96
|
|
97 /* Read all part values. */
|
|
98 gcov_type read_counters[2 * GCOV_TOPN_VALUES];
|
|
99
|
|
100 for (unsigned i = 0; i < GCOV_TOPN_VALUES; i++)
|
|
101 {
|
|
102 read_counters[2 * i] = gcov_get_counter_target ();
|
|
103 read_counters[2 * i + 1] = gcov_get_counter_ignore_scaling (-1);
|
|
104 }
|
|
105
|
|
106 if (read_counters[1] == -1)
|
|
107 {
|
|
108 counters[1] = -1;
|
|
109 return;
|
|
110 }
|
|
111
|
|
112 for (unsigned i = 0; i < GCOV_TOPN_VALUES; i++)
|
|
113 {
|
|
114 if (read_counters[2 * i + 1] == 0)
|
|
115 continue;
|
|
116
|
|
117 unsigned j;
|
|
118 int slot = -1;
|
|
119
|
|
120 for (j = 0; j < GCOV_TOPN_VALUES; j++)
|
|
121 {
|
|
122 if (counters[2 * j] == read_counters[2 * i])
|
|
123 {
|
|
124 counters[2 * j + 1] += read_counters[2 * i + 1];
|
|
125 break;
|
|
126 }
|
|
127 else if (counters[2 * j + 1] == 0)
|
|
128 slot = j;
|
|
129 }
|
|
130
|
|
131 if (j == GCOV_TOPN_VALUES)
|
|
132 {
|
|
133 if (slot > 0)
|
|
134 {
|
|
135 /* If we found empty slot, add the value. */
|
|
136 counters[2 * slot] = read_counters[2 * i];
|
|
137 counters[2 * slot + 1] = read_counters[2 * i + 1];
|
|
138 }
|
|
139 else
|
|
140 {
|
|
141 /* We haven't found a slot, bail out. */
|
|
142 counters[1] = -1;
|
|
143 return;
|
|
144 }
|
|
145 }
|
|
146 }
|
|
147 }
|
|
148
|
111
|
149 /* The profile merging function for choosing the most common value.
|
|
150 It is given an array COUNTERS of N_COUNTERS old counters and it
|
|
151 reads the same number of counters from the gcov file. The counters
|
145
|
152 are split into pairs where the members of the tuple have
|
111
|
153 meanings:
|
|
154
|
|
155 -- the stored candidate on the most common value of the measured entity
|
|
156 -- counter
|
145
|
157 */
|
111
|
158 void
|
145
|
159 __gcov_merge_topn (gcov_type *counters, unsigned n_counters)
|
111
|
160 {
|
145
|
161 gcc_assert (!(n_counters % GCOV_TOPN_VALUES_COUNTERS));
|
111
|
162
|
145
|
163 for (unsigned i = 0; i < (n_counters / GCOV_TOPN_VALUES_COUNTERS); i++)
|
|
164 merge_topn_values_set (counters + (i * GCOV_TOPN_VALUES_COUNTERS));
|
|
165 }
|
|
166 #endif /* L_gcov_merge_topn */
|
111
|
167
|
|
168 #endif /* inhibit_libc */
|