libcounter/counter-internal.h

   1 /*
   2  * counter/counter-internal.h
   3  *
   4  * LTTng Counters Internal Header
   5  *
   6  * Copyright (C) 2020 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a copy
   9  * of this software and associated documentation files (the "Software"), to deal
  10  * in the Software without restriction, including without limitation the rights
  11  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  12  * copies of the Software, and to permit persons to whom the Software is
  13  * furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included in
  16  * all copies or substantial portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  21  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  23  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  24  * SOFTWARE.
  25  */
  26
  27 #ifndef _LTTNG_COUNTER_INTERNAL_H
  28 #define _LTTNG_COUNTER_INTERNAL_H
  29
  30 #include <stdint.h>
  31 #include <lttng/ust-config.h>
  32 #include <urcu/compiler.h>
  33 #include "counter-types.h"
  34
  35 static inline int lttng_counter_validate_indexes(const struct lib_counter_config *config,
  36                                                  struct lib_counter *counter,
  37                                                  const size_t *dimension_indexes)
  38 {
  39         size_t nr_dimensions = counter->nr_dimensions, i;
  40
  41         for (i = 0; i < nr_dimensions; i++) {
  42                 if (caa_unlikely(dimension_indexes[i] >= counter->dimensions[i].max_nr_elem))
  43                         return -EOVERFLOW;
  44         }
  45         return 0;
  46 }
  47
  48
  49 static inline size_t lttng_counter_get_index(const struct lib_counter_config *config,
  50                                              struct lib_counter *counter,
  51                                              const size_t *dimension_indexes)
  52 {
  53         size_t nr_dimensions = counter->nr_dimensions, i;
  54         size_t index = 0;
  55
  56         for (i = 0; i < nr_dimensions; i++) {
  57                 struct lib_counter_dimension *dimension = &counter->dimensions[i];
  58                 const size_t *dimension_index = &dimension_indexes[i];
  59
  60                 index += *dimension_index * dimension->stride;
  61         }
  62         return index;
  63 }
  64
  65 #endif /* _LTTNG_COUNTER_INTERNAL_H */