1 /* Routines required for instrumenting a program. */ 2 /* Compile this one with gcc. */ 3 /* Copyright (C) 1989-2022 Free Software Foundation, Inc. 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 36 #ifdef L_gcov_merge_topn 37 void __gcov_merge_topn (gcov_type *counters __attribute__ ((unused)), 38 unsigned n_counters __attribute__ ((unused))) {} 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 87 #ifdef L_gcov_merge_topn 88 89 /* The profile merging function for choosing the most common value. 90 It is given an array COUNTERS of N_COUNTERS old counters and it 91 reads the same number of counters from the gcov file. The counters 92 are split into pairs where the members of the tuple have 93 meanings: 94 95 -- the stored candidate on the most common value of the measured entity 96 -- counter 97 98 We use -TOTAL for situation when merging dropped some values. 99 The information is used for -fprofile-reproducible flag. 100 */ 101 102 void 103 __gcov_merge_topn (gcov_type *counters, unsigned n_counters) 104 { 105 gcc_assert (!(n_counters % GCOV_TOPN_MEM_COUNTERS)); 106 107 for (unsigned i = 0; i < (n_counters / GCOV_TOPN_MEM_COUNTERS); i++) 108 { 109 /* First value is number of total executions of the profiler. */ 110 gcov_type all = gcov_get_counter_ignore_scaling (-1); 111 gcov_type n = gcov_get_counter_ignore_scaling (-1); 112 113 unsigned full = all < 0; 114 gcov_type *total = &counters[GCOV_TOPN_MEM_COUNTERS * i]; 115 *total += full ? -all : all; 116 117 for (unsigned j = 0; j < n; j++) 118 { 119 gcov_type value = gcov_get_counter_target (); 120 gcov_type count = gcov_get_counter_ignore_scaling (-1); 121 122 // TODO: we should use atomic here 123 full |= gcov_topn_add_value (counters + GCOV_TOPN_MEM_COUNTERS * i, 124 value, count, 0, 0); 125 } 126 127 if (full) 128 *total = -(*total); 129 } 130 } 131 #endif /* L_gcov_merge_topn */ 132 133 #endif /* inhibit_libc */ 134