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d6d3f033 RX |
1 | /* Routines required for instrumenting a program. */ |
2 | /* Compile this one with gcc. */ | |
83ffe9cd | 3 | /* Copyright (C) 1989-2023 Free Software Foundation, Inc. |
d6d3f033 RX |
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 | ||
40d6b753 | 26 | #include "libgcov.h" |
d6d3f033 | 27 | #if !defined(inhibit_libc) |
d6d3f033 RX |
28 | |
29 | #ifdef L_gcov_interval_profiler | |
30 | /* If VALUE is in interval <START, START + STEPS - 1>, then increases the | |
31 | corresponding counter in COUNTERS. If the VALUE is above or below | |
32 | the interval, COUNTERS[STEPS] or COUNTERS[STEPS + 1] is increased | |
33 | instead. */ | |
34 | ||
35 | void | |
36 | __gcov_interval_profiler (gcov_type *counters, gcov_type value, | |
37 | int start, unsigned steps) | |
38 | { | |
39 | gcov_type delta = value - start; | |
40 | if (delta < 0) | |
41 | counters[steps + 1]++; | |
42 | else if (delta >= steps) | |
43 | counters[steps]++; | |
44 | else | |
45 | counters[delta]++; | |
46 | } | |
47 | #endif | |
48 | ||
7fe76f6a | 49 | #if defined(L_gcov_interval_profiler_atomic) && GCOV_SUPPORTS_ATOMIC |
a266236e ML |
50 | /* If VALUE is in interval <START, START + STEPS - 1>, then increases the |
51 | corresponding counter in COUNTERS. If the VALUE is above or below | |
52 | the interval, COUNTERS[STEPS] or COUNTERS[STEPS + 1] is increased | |
53 | instead. Function is thread-safe. */ | |
54 | ||
55 | void | |
56 | __gcov_interval_profiler_atomic (gcov_type *counters, gcov_type value, | |
57 | int start, unsigned steps) | |
58 | { | |
59 | gcov_type delta = value - start; | |
60 | if (delta < 0) | |
4d0cdd0c | 61 | __atomic_fetch_add (&counters[steps + 1], 1, __ATOMIC_RELAXED); |
a266236e | 62 | else if (delta >= steps) |
4d0cdd0c | 63 | __atomic_fetch_add (&counters[steps], 1, __ATOMIC_RELAXED); |
a266236e | 64 | else |
4d0cdd0c | 65 | __atomic_fetch_add (&counters[delta], 1, __ATOMIC_RELAXED); |
a266236e ML |
66 | } |
67 | #endif | |
68 | ||
d6d3f033 RX |
69 | #ifdef L_gcov_pow2_profiler |
70 | /* If VALUE is a power of two, COUNTERS[1] is incremented. Otherwise | |
71 | COUNTERS[0] is incremented. */ | |
72 | ||
73 | void | |
74 | __gcov_pow2_profiler (gcov_type *counters, gcov_type value) | |
75 | { | |
dcb1e137 | 76 | if (value == 0 || (value & (value - 1))) |
d6d3f033 RX |
77 | counters[0]++; |
78 | else | |
79 | counters[1]++; | |
80 | } | |
81 | #endif | |
82 | ||
7fe76f6a | 83 | #if defined(L_gcov_pow2_profiler_atomic) && GCOV_SUPPORTS_ATOMIC |
a266236e ML |
84 | /* If VALUE is a power of two, COUNTERS[1] is incremented. Otherwise |
85 | COUNTERS[0] is incremented. Function is thread-safe. */ | |
86 | ||
87 | void | |
88 | __gcov_pow2_profiler_atomic (gcov_type *counters, gcov_type value) | |
89 | { | |
90 | if (value == 0 || (value & (value - 1))) | |
4d0cdd0c | 91 | __atomic_fetch_add (&counters[0], 1, __ATOMIC_RELAXED); |
a266236e | 92 | else |
4d0cdd0c | 93 | __atomic_fetch_add (&counters[1], 1, __ATOMIC_RELAXED); |
a266236e ML |
94 | } |
95 | #endif | |
96 | ||
596341c7 | 97 | /* Tries to determine N most commons value among its inputs. */ |
d6d3f033 RX |
98 | |
99 | static inline void | |
596341c7 ML |
100 | __gcov_topn_values_profiler_body (gcov_type *counters, gcov_type value, |
101 | int use_atomic) | |
d6d3f033 | 102 | { |
871e5ada | 103 | gcov_topn_add_value (counters, value, 1, use_atomic, 1); |
d6d3f033 RX |
104 | } |
105 | ||
596341c7 | 106 | #ifdef L_gcov_topn_values_profiler |
d6d3f033 | 107 | void |
596341c7 | 108 | __gcov_topn_values_profiler (gcov_type *counters, gcov_type value) |
d6d3f033 | 109 | { |
596341c7 | 110 | __gcov_topn_values_profiler_body (counters, value, 0); |
a266236e ML |
111 | } |
112 | #endif | |
113 | ||
596341c7 | 114 | #if defined(L_gcov_topn_values_profiler_atomic) && GCOV_SUPPORTS_ATOMIC |
a266236e ML |
115 | |
116 | /* Update one value profilers (COUNTERS) for a given VALUE. | |
117 | ||
118 | CAVEAT: Following function is not thread-safe, only total number | |
119 | of executions (COUNTERS[2]) is update with an atomic instruction. | |
120 | Problem is that one cannot atomically update two counters | |
121 | (COUNTERS[0] and COUNTERS[1]), for more information please read | |
122 | following email thread: | |
123 | https://gcc.gnu.org/ml/gcc-patches/2016-08/msg00024.html. */ | |
124 | ||
125 | void | |
596341c7 | 126 | __gcov_topn_values_profiler_atomic (gcov_type *counters, gcov_type value) |
a266236e | 127 | { |
596341c7 | 128 | __gcov_topn_values_profiler_body (counters, value, 1); |
d6d3f033 RX |
129 | } |
130 | #endif | |
131 | ||
92d41717 | 132 | #ifdef L_gcov_indirect_call_profiler_v4 |
d6d3f033 RX |
133 | |
134 | /* These two variables are used to actually track caller and callee. Keep | |
135 | them in TLS memory so races are not common (they are written to often). | |
136 | The variables are set directly by GCC instrumented code, so declaration | |
137 | here must match one in tree-profile.c */ | |
138 | ||
139 | #if defined(HAVE_CC_TLS) && !defined (USE_EMUTLS) | |
140 | __thread | |
141 | #endif | |
3edbcdbe | 142 | struct indirect_call_tuple __gcov_indirect_call; |
d6d3f033 RX |
143 | |
144 | /* By default, the C++ compiler will use function addresses in the | |
145 | vtable entries. Setting TARGET_VTABLE_USES_DESCRIPTORS to nonzero | |
146 | tells the compiler to use function descriptors instead. The value | |
53d68b9f | 147 | of this macro says how many words wide the descriptor is (normally 2). |
d6d3f033 RX |
148 | |
149 | It is assumed that the address of a function descriptor may be treated | |
150 | as a pointer to a function. */ | |
151 | ||
d6d3f033 | 152 | /* Tries to determine the most common value among its inputs. */ |
3ae37f92 ML |
153 | static inline void |
154 | __gcov_indirect_call_profiler_body (gcov_type value, void *cur_func, | |
155 | int use_atomic) | |
d6d3f033 RX |
156 | { |
157 | /* If the C++ virtual tables contain function descriptors then one | |
158 | function may have multiple descriptors and we need to dereference | |
159 | the descriptors to see if they point to the same function. */ | |
3edbcdbe | 160 | if (cur_func == __gcov_indirect_call.callee |
fd2e1dcd | 161 | || (__LIBGCC_VTABLE_USES_DESCRIPTORS__ |
3edbcdbe | 162 | && *(void **) cur_func == *(void **) __gcov_indirect_call.callee)) |
3ae37f92 ML |
163 | __gcov_topn_values_profiler_body (__gcov_indirect_call.counters, value, |
164 | use_atomic); | |
4f751c54 | 165 | |
3edbcdbe | 166 | __gcov_indirect_call.callee = NULL; |
d6d3f033 | 167 | } |
3ae37f92 ML |
168 | |
169 | void | |
170 | __gcov_indirect_call_profiler_v4 (gcov_type value, void *cur_func) | |
171 | { | |
172 | __gcov_indirect_call_profiler_body (value, cur_func, 0); | |
173 | } | |
174 | ||
175 | #if GCOV_SUPPORTS_ATOMIC | |
176 | void | |
177 | __gcov_indirect_call_profiler_v4_atomic (gcov_type value, void *cur_func) | |
178 | { | |
179 | __gcov_indirect_call_profiler_body (value, cur_func, 1); | |
180 | } | |
181 | #endif | |
182 | ||
d6d3f033 RX |
183 | #endif |
184 | ||
185 | #ifdef L_gcov_time_profiler | |
186 | ||
187 | /* Counter for first visit of each function. */ | |
3239d726 | 188 | gcov_type __gcov_time_profiler_counter ATTRIBUTE_HIDDEN; |
d6d3f033 | 189 | |
d6d3f033 | 190 | #endif |
a266236e | 191 | |
d6d3f033 RX |
192 | #ifdef L_gcov_average_profiler |
193 | /* Increase corresponding COUNTER by VALUE. FIXME: Perhaps we want | |
194 | to saturate up. */ | |
195 | ||
196 | void | |
197 | __gcov_average_profiler (gcov_type *counters, gcov_type value) | |
198 | { | |
199 | counters[0] += value; | |
200 | counters[1] ++; | |
201 | } | |
202 | #endif | |
203 | ||
7fe76f6a | 204 | #if defined(L_gcov_average_profiler_atomic) && GCOV_SUPPORTS_ATOMIC |
a266236e ML |
205 | /* Increase corresponding COUNTER by VALUE. FIXME: Perhaps we want |
206 | to saturate up. Function is thread-safe. */ | |
207 | ||
208 | void | |
209 | __gcov_average_profiler_atomic (gcov_type *counters, gcov_type value) | |
210 | { | |
4d0cdd0c TP |
211 | __atomic_fetch_add (&counters[0], value, __ATOMIC_RELAXED); |
212 | __atomic_fetch_add (&counters[1], 1, __ATOMIC_RELAXED); | |
a266236e ML |
213 | } |
214 | #endif | |
215 | ||
d6d3f033 RX |
216 | #ifdef L_gcov_ior_profiler |
217 | /* Bitwise-OR VALUE into COUNTER. */ | |
218 | ||
219 | void | |
220 | __gcov_ior_profiler (gcov_type *counters, gcov_type value) | |
221 | { | |
222 | *counters |= value; | |
223 | } | |
224 | #endif | |
225 | ||
7fe76f6a | 226 | #if defined(L_gcov_ior_profiler_atomic) && GCOV_SUPPORTS_ATOMIC |
a266236e ML |
227 | /* Bitwise-OR VALUE into COUNTER. Function is thread-safe. */ |
228 | ||
229 | void | |
230 | __gcov_ior_profiler_atomic (gcov_type *counters, gcov_type value) | |
231 | { | |
4d0cdd0c | 232 | __atomic_fetch_or (&counters[0], value, __ATOMIC_RELAXED); |
a266236e ML |
233 | } |
234 | #endif | |
235 | ||
236 | ||
d6d3f033 | 237 | #endif /* inhibit_libc */ |