include/babeltrace/trace-ir/utils-internal.h

   1 #ifndef BABELTRACE_TRACE_IR_UTILS_INTERNAL_H
   2 #define BABELTRACE_TRACE_IR_UTILS_INTERNAL_H
   3
   4 /*
   5  * Permission is hereby granted, free of charge, to any person obtaining a copy
   6  * of this software and associated documentation files (the "Software"), to deal
   7  * in the Software without restriction, including without limitation the rights
   8  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   9  * copies of the Software, and to permit persons to whom the Software is
  10  * furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be included in
  13  * all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  18  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  20  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  21  * SOFTWARE.
  22  */
  23
  24 #include <babeltrace/babeltrace-internal.h>
  25 #include <babeltrace/trace-ir/field-classes.h>
  26 #include <babeltrace/trace-ir/clock-class-internal.h>
  27 #include <stdint.h>
  28
  29 struct search_query {
  30         gpointer value;
  31         int found;
  32 };
  33
  34 static inline
  35 uint64_t bt_util_ns_from_value(uint64_t frequency, uint64_t value_cycles)
  36 {
  37         uint64_t ns;
  38
  39         if (frequency == UINT64_C(1000000000)) {
  40                 ns = value_cycles;
  41         } else {
  42                 double dblres = ((1e9 * (double) value_cycles) / (double) frequency);
  43
  44                 if (dblres >= (double) UINT64_MAX) {
  45                         /* Overflows uint64_t */
  46                         ns = UINT64_C(-1);
  47                 } else {
  48                         ns = (uint64_t) dblres;
  49                 }
  50         }
  51
  52         return ns;
  53 }
  54
  55 static inline
  56 int bt_util_ns_from_origin(const struct bt_clock_class *clock_class,
  57                 uint64_t value, int64_t *ns_from_origin)
  58 {
  59         int ret = 0;
  60         uint64_t value_ns_unsigned;
  61         int64_t value_ns_signed;
  62
  63         if (clock_class->base_offset.overflows) {
  64                 ret = -1;
  65                 goto end;
  66         }
  67
  68         /* Initialize to clock class's base offset */
  69         *ns_from_origin = clock_class->base_offset.value_ns;
  70
  71         /* Add given value in cycles */
  72         value_ns_unsigned = bt_util_ns_from_value(clock_class->frequency, value);
  73         if (value_ns_unsigned >= (uint64_t) INT64_MAX) {
  74                 /*
  75                  * FIXME: `value_ns_unsigned` could be greater than
  76                  * `INT64_MAX` in fact: in this case, we need to
  77                  * subtract `INT64_MAX` from `value_ns_unsigned`, make
  78                  * sure that the difference is less than `INT64_MAX`,
  79                  * and try to add them one after the other to
  80                  * `*ns_from_origin`.
  81                  */
  82                 ret = -1;
  83                 goto end;
  84         }
  85
  86         value_ns_signed = (int64_t) value_ns_unsigned;
  87         BT_ASSERT(value_ns_signed >= 0);
  88
  89         if (*ns_from_origin <= 0) {
  90                 goto add_value;
  91         }
  92
  93         if (value_ns_signed > INT64_MAX - *ns_from_origin) {
  94                 ret = -1;
  95                 goto end;
  96         }
  97
  98 add_value:
  99         *ns_from_origin += value_ns_signed;
 100
 101 end:
 102         return ret;
 103 }
 104
 105 static inline
 106 bool bt_util_value_is_in_range_signed(uint64_t size, int64_t value)
 107 {
 108         int64_t min_value = UINT64_C(-1) << (size - 1);
 109         int64_t max_value = (UINT64_C(1) << (size - 1)) - 1;
 110         return value >= min_value && value <= max_value;
 111 }
 112
 113 static inline
 114 bool bt_util_value_is_in_range_unsigned(unsigned int size, uint64_t value)
 115 {
 116         uint64_t max_value = (size == 64) ? UINT64_MAX :
 117                 (UINT64_C(1) << size) - 1;
 118         return value <= max_value;
 119 }
 120
 121 #endif /* BABELTRACE_TRACE_IR_UTILS_INTERNAL_H */