src/lib/trace-ir/trace-class.c

   1 /*
   2  * Copyright 2017-2018 Philippe Proulx <pproulx@efficios.com>
   3  * Copyright 2014 Jérémie Galarneau <jeremie.galarneau@efficios.com>
   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 #define BT_LOG_TAG "LIB/TRACE"
  25 #include "lib/logging.h"
  26
  27 #include "lib/assert-pre.h"
  28 #include <babeltrace2/trace-ir/trace-class.h>
  29 #include <babeltrace2/trace-ir/trace-class-const.h>
  30 #include <babeltrace2/trace-ir/event-class.h>
  31 #include "ctf-writer/functor.h"
  32 #include "ctf-writer/clock.h"
  33 #include "compat/compiler.h"
  34 #include <babeltrace2/value.h>
  35 #include <babeltrace2/value-const.h>
  36 #include "lib/value.h"
  37 #include <babeltrace2/types.h>
  38 #include "compat/endian.h"
  39 #include "common/assert.h"
  40 #include "compat/glib.h"
  41 #include <inttypes.h>
  42 #include <stdint.h>
  43 #include <string.h>
  44 #include <stdlib.h>
  45
  46 #include "clock-class.h"
  47 #include "event-class.h"
  48 #include "event.h"
  49 #include "field-class.h"
  50 #include "field-wrapper.h"
  51 #include "resolve-field-path.h"
  52 #include "stream-class.h"
  53 #include "stream.h"
  54 #include "trace.h"
  55 #include "utils.h"
  56 #include "lib/func-status.h"
  57
  58 struct bt_trace_class_destruction_listener_elem {
  59         bt_trace_class_destruction_listener_func func;
  60         void *data;
  61 };
  62
  63 #define BT_ASSERT_PRE_DEV_TRACE_CLASS_HOT(_tc)                          \
  64         BT_ASSERT_PRE_DEV_HOT((_tc), "Trace class", ": %!+T", (_tc))
  65
  66 static
  67 void destroy_trace_class(struct bt_object *obj)
  68 {
  69         struct bt_trace_class *tc = (void *) obj;
  70
  71         BT_LIB_LOGD("Destroying trace class object: %!+T", tc);
  72         /*
  73          * Call destruction listener functions so that everything else
  74          * still exists in the trace class.
  75          */
  76         if (tc->destruction_listeners) {
  77                 uint64_t i;
  78                 BT_LIB_LOGD("Calling trace class destruction listener(s): %!+T", tc);
  79
  80                 /*
  81                 * The trace class' reference count is 0 if we're here. Increment
  82                 * it to avoid a double-destroy (possibly infinitely recursive).
  83                 * This could happen for example if a destruction listener did
  84                 * bt_object_get_ref() (or anything that causes
  85                 * bt_object_get_ref() to be called) on the trace class (ref.
  86                 * count goes from 0 to 1), and then bt_object_put_ref(): the
  87                 * reference count would go from 1 to 0 again and this function
  88                 * would be called again.
  89                 */
  90                 tc->base.ref_count++;
  91
  92                 /* Call all the trace class destruction listeners */
  93                 for (i = 0; i < tc->destruction_listeners->len; i++) {
  94                         struct bt_trace_class_destruction_listener_elem elem =
  95                                 g_array_index(tc->destruction_listeners,
  96                                                 struct bt_trace_class_destruction_listener_elem, i);
  97
  98                         if (elem.func) {
  99                                 elem.func(tc, elem.data);
 100                         }
 101
 102                         /*
 103                          * The destruction listener should not have kept a
 104                          * reference to the trace class.
 105                          */
 106                         BT_ASSERT_PRE(tc->base.ref_count == 1, "Destruction listener kept a reference to the trace class being destroyed: %![tc-]+T", tc);
 107                 }
 108                 g_array_free(tc->destruction_listeners, TRUE);
 109                 tc->destruction_listeners = NULL;
 110         }
 111
 112         if (tc->stream_classes) {
 113                 BT_LOGD_STR("Destroying stream classes.");
 114                 g_ptr_array_free(tc->stream_classes, TRUE);
 115                 tc->stream_classes = NULL;
 116         }
 117
 118         g_free(tc);
 119 }
 120
 121 struct bt_trace_class *bt_trace_class_create(bt_self_component *self_comp)
 122 {
 123         struct bt_trace_class *tc = NULL;
 124
 125         BT_ASSERT_PRE_NON_NULL(self_comp, "Self component");
 126         BT_LOGD_STR("Creating default trace class object.");
 127         tc = g_new0(struct bt_trace_class, 1);
 128         if (!tc) {
 129                 BT_LIB_LOGE_APPEND_CAUSE("Failed to allocate one trace class.");
 130                 goto error;
 131         }
 132
 133         bt_object_init_shared_with_parent(&tc->base, destroy_trace_class);
 134
 135         tc->stream_classes = g_ptr_array_new_with_free_func(
 136                 (GDestroyNotify) bt_object_try_spec_release);
 137         if (!tc->stream_classes) {
 138                 BT_LIB_LOGE_APPEND_CAUSE("Failed to allocate one GPtrArray.");
 139                 goto error;
 140         }
 141
 142         tc->destruction_listeners = g_array_new(FALSE, TRUE,
 143                 sizeof(struct bt_trace_class_destruction_listener_elem));
 144         if (!tc->destruction_listeners) {
 145                 BT_LIB_LOGE_APPEND_CAUSE("Failed to allocate one GArray.");
 146                 goto error;
 147         }
 148
 149         tc->assigns_automatic_stream_class_id = true;
 150         BT_LIB_LOGD("Created trace class object: %!+T", tc);
 151         goto end;
 152
 153 error:
 154         BT_OBJECT_PUT_REF_AND_RESET(tc);
 155
 156 end:
 157         return tc;
 158 }
 159
 160 enum bt_trace_class_add_listener_status bt_trace_class_add_destruction_listener(
 161                 const struct bt_trace_class *_tc,
 162                 bt_trace_class_destruction_listener_func listener,
 163                 void *data, uint64_t *listener_id)
 164 {
 165         struct bt_trace_class *tc = (void *) _tc;
 166         uint64_t i;
 167         struct bt_trace_class_destruction_listener_elem new_elem = {
 168                 .func = listener,
 169                 .data = data,
 170         };
 171
 172         BT_ASSERT_PRE_NON_NULL(tc, "Trace class");
 173         BT_ASSERT_PRE_NON_NULL(listener, "Listener");
 174
 175         /* Find the next available spot */
 176         for (i = 0; i < tc->destruction_listeners->len; i++) {
 177                 struct bt_trace_class_destruction_listener_elem elem =
 178                         g_array_index(tc->destruction_listeners,
 179                                 struct bt_trace_class_destruction_listener_elem, i);
 180
 181                 if (!elem.func) {
 182                         break;
 183                 }
 184         }
 185
 186         if (i == tc->destruction_listeners->len) {
 187                 g_array_append_val(tc->destruction_listeners, new_elem);
 188         } else {
 189                 g_array_insert_val(tc->destruction_listeners, i, new_elem);
 190         }
 191
 192         if (listener_id) {
 193                 *listener_id = i;
 194         }
 195
 196         BT_LIB_LOGD("Added trace class destruction listener: %![tc-]+T, "
 197                         "listener-id=%" PRIu64, tc, i);
 198         return BT_FUNC_STATUS_OK;
 199 }
 200
 201 static
 202 bool has_listener_id(const struct bt_trace_class *tc, uint64_t listener_id)
 203 {
 204         BT_ASSERT(listener_id < tc->destruction_listeners->len);
 205         return (&g_array_index(tc->destruction_listeners,
 206                         struct bt_trace_class_destruction_listener_elem,
 207                         listener_id))->func;
 208 }
 209
 210 enum bt_trace_class_remove_listener_status bt_trace_class_remove_destruction_listener(
 211                 const struct bt_trace_class *_tc, uint64_t listener_id)
 212 {
 213         struct bt_trace_class *tc = (void *) _tc;
 214         struct bt_trace_class_destruction_listener_elem *elem;
 215
 216         BT_ASSERT_PRE_NON_NULL(tc, "Trace class");
 217         BT_ASSERT_PRE(has_listener_id(tc, listener_id),
 218                 "Trace class has no such trace class destruction listener ID: "
 219                 "%![tc-]+T, %" PRIu64, tc, listener_id);
 220         elem = &g_array_index(tc->destruction_listeners,
 221                         struct bt_trace_class_destruction_listener_elem,
 222                         listener_id);
 223         BT_ASSERT(elem->func);
 224
 225         elem->func = NULL;
 226         elem->data = NULL;
 227         BT_LIB_LOGD("Removed trace class destruction listener: "
 228                 "%![tc-]+T, listener-id=%" PRIu64,
 229                 tc, listener_id);
 230         return BT_FUNC_STATUS_OK;
 231 }
 232
 233 uint64_t bt_trace_class_get_stream_class_count(const struct bt_trace_class *tc)
 234 {
 235         BT_ASSERT_PRE_DEV_NON_NULL(tc, "Trace class");
 236         return (uint64_t) tc->stream_classes->len;
 237 }
 238
 239 struct bt_stream_class *bt_trace_class_borrow_stream_class_by_index(
 240                 struct bt_trace_class *tc, uint64_t index)
 241 {
 242         BT_ASSERT_PRE_DEV_NON_NULL(tc, "Trace class");
 243         BT_ASSERT_PRE_DEV_VALID_INDEX(index, tc->stream_classes->len);
 244         return g_ptr_array_index(tc->stream_classes, index);
 245 }
 246
 247 const struct bt_stream_class *
 248 bt_trace_class_borrow_stream_class_by_index_const(
 249                 const struct bt_trace_class *tc, uint64_t index)
 250 {
 251         return bt_trace_class_borrow_stream_class_by_index(
 252                 (void *) tc, index);
 253 }
 254
 255 struct bt_stream_class *bt_trace_class_borrow_stream_class_by_id(
 256                 struct bt_trace_class *tc, uint64_t id)
 257 {
 258         struct bt_stream_class *stream_class = NULL;
 259         uint64_t i;
 260
 261         BT_ASSERT_PRE_DEV_NON_NULL(tc, "Trace class");
 262
 263         for (i = 0; i < tc->stream_classes->len; i++) {
 264                 struct bt_stream_class *stream_class_candidate =
 265                         g_ptr_array_index(tc->stream_classes, i);
 266
 267                 if (stream_class_candidate->id == id) {
 268                         stream_class = stream_class_candidate;
 269                         goto end;
 270                 }
 271         }
 272
 273 end:
 274         return stream_class;
 275 }
 276
 277 const struct bt_stream_class *
 278 bt_trace_class_borrow_stream_class_by_id_const(
 279                 const struct bt_trace_class *tc, uint64_t id)
 280 {
 281         return bt_trace_class_borrow_stream_class_by_id((void *) tc, id);
 282 }
 283
 284 BT_HIDDEN
 285 void _bt_trace_class_freeze(const struct bt_trace_class *tc)
 286 {
 287         BT_ASSERT(tc);
 288         BT_LIB_LOGD("Freezing trace class: %!+T", tc);
 289         ((struct bt_trace_class *) tc)->frozen = true;
 290 }
 291
 292 bt_bool bt_trace_class_assigns_automatic_stream_class_id(const struct bt_trace_class *tc)
 293 {
 294         BT_ASSERT_PRE_DEV_NON_NULL(tc, "Trace class");
 295         return (bt_bool) tc->assigns_automatic_stream_class_id;
 296 }
 297
 298 void bt_trace_class_set_assigns_automatic_stream_class_id(struct bt_trace_class *tc,
 299                 bt_bool value)
 300 {
 301         BT_ASSERT_PRE_NON_NULL(tc, "Trace class");
 302         BT_ASSERT_PRE_DEV_TRACE_CLASS_HOT(tc);
 303         tc->assigns_automatic_stream_class_id = (bool) value;
 304         BT_LIB_LOGD("Set trace class's automatic stream class ID "
 305                 "assignment property: %!+T", tc);
 306 }
 307
 308 void bt_trace_class_get_ref(const struct bt_trace_class *trace_class)
 309 {
 310         bt_object_get_ref(trace_class);
 311 }
 312
 313 void bt_trace_class_put_ref(const struct bt_trace_class *trace_class)
 314 {
 315         bt_object_put_ref(trace_class);
 316 }