Implement libcounter

[deliverable/lttng-ust.git] / libcounter / counter-internal.h

diff --git a/libcounter/counter-internal.h b/libcounter/counter-internal.h
new file mode 100644 (file)
index 0000000..38cb089
--- /dev/null
+++ b/libcounter/counter-internal.h
@@ -0,0 +1,65 @@
+/*
+ * counter/counter-internal.h
+ *
+ * LTTng Counters Internal Header
+ *
+ * Copyright (C) 2020 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#ifndef _LTTNG_COUNTER_INTERNAL_H
+#define _LTTNG_COUNTER_INTERNAL_H
+
+#include <stdint.h>
+#include <lttng/ust-config.h>
+#include <urcu/compiler.h>
+#include "counter-types.h"
+
+static inline int lttng_counter_validate_indexes(const struct lib_counter_config *config,
+                                                struct lib_counter *counter,
+                                                const size_t *dimension_indexes)
+{
+       size_t nr_dimensions = counter->nr_dimensions, i;
+
+       for (i = 0; i < nr_dimensions; i++) {
+               if (caa_unlikely(dimension_indexes[i] >= counter->dimensions[i].max_nr_elem))
+                       return -EOVERFLOW;
+       }
+       return 0;
+}
+
+
+static inline size_t lttng_counter_get_index(const struct lib_counter_config *config,
+                                            struct lib_counter *counter,
+                                            const size_t *dimension_indexes)
+{
+       size_t nr_dimensions = counter->nr_dimensions, i;
+       size_t index = 0;
+
+       for (i = 0; i < nr_dimensions; i++) {
+               struct lib_counter_dimension *dimension = &counter->dimensions[i];
+               const size_t *dimension_index = &dimension_indexes[i];
+
+               index += *dimension_index * dimension->stride;
+       }
+       return index;
+}
+
+#endif /* _LTTNG_COUNTER_INTERNAL_H */