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

   1 /*
   2  * SPDX-License-Identifier: MIT
   3  *
   4  * Copyright 2017-2018 Philippe Proulx <pproulx@efficios.com>
   5  * Copyright 2014 Jérémie Galarneau <jeremie.galarneau@efficios.com>
   6  */
   7
   8 #define BT_LOG_TAG "LIB/TRACE-CLASS"
   9 #include "lib/logging.h"
  10
  11 #include "lib/assert-cond.h"
  12 #include <babeltrace2/trace-ir/trace-class.h>
  13 #include <babeltrace2/trace-ir/event-class.h>
  14 #include "ctf-writer/functor.h"
  15 #include "ctf-writer/clock.h"
  16 #include "compat/compiler.h"
  17 #include <babeltrace2/value.h>
  18 #include "lib/value.h"
  19 #include <babeltrace2/types.h>
  20 #include "compat/endian.h"
  21 #include "common/assert.h"
  22 #include "compat/glib.h"
  23 #include <inttypes.h>
  24 #include <stdint.h>
  25 #include <string.h>
  26 #include <stdbool.h>
  27 #include <stdlib.h>
  28
  29 #include "clock-class.h"
  30 #include "event-class.h"
  31 #include "event.h"
  32 #include "field-class.h"
  33 #include "field-wrapper.h"
  34 #include "resolve-field-path.h"
  35 #include "stream-class.h"
  36 #include "stream.h"
  37 #include "trace.h"
  38 #include "utils.h"
  39 #include "lib/value.h"
  40 #include "lib/func-status.h"
  41
  42 struct bt_trace_class_destruction_listener_elem {
  43         bt_trace_class_destruction_listener_func func;
  44         void *data;
  45 };
  46
  47 #define BT_ASSERT_PRE_DEV_TRACE_CLASS_HOT(_tc)                          \
  48         BT_ASSERT_PRE_DEV_HOT("trace-class", (_tc), "Trace class",      \
  49                 ": %!+T", (_tc))
  50
  51 #define DESTRUCTION_LISTENER_FUNC_NAME  "bt_trace_destruction_listener_func"
  52
  53 static
  54 void destroy_trace_class(struct bt_object *obj)
  55 {
  56         struct bt_trace_class *tc = (void *) obj;
  57
  58         BT_LIB_LOGD("Destroying trace class object: %!+T", tc);
  59         BT_OBJECT_PUT_REF_AND_RESET(tc->user_attributes);
  60
  61         /*
  62          * Call destruction listener functions so that everything else
  63          * still exists in the trace class.
  64          */
  65         if (tc->destruction_listeners) {
  66                 uint64_t i;
  67                 const struct bt_error *saved_error;
  68
  69                 BT_LIB_LOGD("Calling trace class destruction listener(s): %!+T", tc);
  70
  71                 /*
  72                 * The trace class' reference count is 0 if we're here. Increment
  73                 * it to avoid a double-destroy (possibly infinitely recursive).
  74                 * This could happen for example if a destruction listener did
  75                 * bt_object_get_ref() (or anything that causes
  76                 * bt_object_get_ref() to be called) on the trace class (ref.
  77                 * count goes from 0 to 1), and then bt_object_put_ref(): the
  78                 * reference count would go from 1 to 0 again and this function
  79                 * would be called again.
  80                 */
  81                 tc->base.ref_count++;
  82
  83                 saved_error = bt_current_thread_take_error();
  84
  85                 /* Call all the trace class destruction listeners */
  86                 for (i = 0; i < tc->destruction_listeners->len; i++) {
  87                         struct bt_trace_class_destruction_listener_elem elem =
  88                                 g_array_index(tc->destruction_listeners,
  89                                                 struct bt_trace_class_destruction_listener_elem, i);
  90
  91                         if (elem.func) {
  92                                 elem.func(tc, elem.data);
  93                                 BT_ASSERT_POST_NO_ERROR(
  94                                         DESTRUCTION_LISTENER_FUNC_NAME);
  95                         }
  96
  97                         /*
  98                          * The destruction listener should not have kept a
  99                          * reference to the trace class.
 100                          */
 101                         BT_ASSERT_POST(DESTRUCTION_LISTENER_FUNC_NAME,
 102                                 "trace-class-reference-count-not-changed",
 103                                 tc->base.ref_count == 1,
 104                                 "Destruction listener kept a reference to the trace class being destroyed: %![tc-]+T",
 105                                 tc);
 106                 }
 107                 g_array_free(tc->destruction_listeners, TRUE);
 108                 tc->destruction_listeners = NULL;
 109
 110                 if (saved_error) {
 111                         BT_CURRENT_THREAD_MOVE_ERROR_AND_RESET(saved_error);
 112                 }
 113         }
 114
 115         if (tc->stream_classes) {
 116                 BT_LOGD_STR("Destroying stream classes.");
 117                 g_ptr_array_free(tc->stream_classes, TRUE);
 118                 tc->stream_classes = NULL;
 119         }
 120
 121         g_free(tc);
 122 }
 123
 124 struct bt_trace_class *bt_trace_class_create(bt_self_component *self_comp)
 125 {
 126         struct bt_trace_class *tc = NULL;
 127
 128         BT_ASSERT_PRE_NO_ERROR();
 129         BT_ASSERT_PRE_COMP_NON_NULL(self_comp);
 130         BT_LOGD_STR("Creating default trace class object.");
 131         tc = g_new0(struct bt_trace_class, 1);
 132         if (!tc) {
 133                 BT_LIB_LOGE_APPEND_CAUSE("Failed to allocate one trace class.");
 134                 goto error;
 135         }
 136
 137         bt_object_init_shared_with_parent(&tc->base, destroy_trace_class);
 138         tc->user_attributes = bt_value_map_create();
 139         if (!tc->user_attributes) {
 140                 BT_LIB_LOGE_APPEND_CAUSE(
 141                         "Failed to create a map value object.");
 142                 goto error;
 143         }
 144
 145         tc->stream_classes = g_ptr_array_new_with_free_func(
 146                 (GDestroyNotify) bt_object_try_spec_release);
 147         if (!tc->stream_classes) {
 148                 BT_LIB_LOGE_APPEND_CAUSE("Failed to allocate one GPtrArray.");
 149                 goto error;
 150         }
 151
 152         tc->destruction_listeners = g_array_new(FALSE, TRUE,
 153                 sizeof(struct bt_trace_class_destruction_listener_elem));
 154         if (!tc->destruction_listeners) {
 155                 BT_LIB_LOGE_APPEND_CAUSE("Failed to allocate one GArray.");
 156                 goto error;
 157         }
 158
 159         tc->assigns_automatic_stream_class_id = true;
 160         BT_LIB_LOGD("Created trace class object: %!+T", tc);
 161         goto end;
 162
 163 error:
 164         BT_OBJECT_PUT_REF_AND_RESET(tc);
 165
 166 end:
 167         return tc;
 168 }
 169
 170 enum bt_trace_class_add_listener_status bt_trace_class_add_destruction_listener(
 171                 const struct bt_trace_class *_tc,
 172                 bt_trace_class_destruction_listener_func listener,
 173                 void *data, bt_listener_id *listener_id)
 174 {
 175         struct bt_trace_class *tc = (void *) _tc;
 176         uint64_t i;
 177         struct bt_trace_class_destruction_listener_elem new_elem = {
 178                 .func = listener,
 179                 .data = data,
 180         };
 181
 182         BT_ASSERT_PRE_NO_ERROR();
 183         BT_ASSERT_PRE_TC_NON_NULL(tc);
 184         BT_ASSERT_PRE_LISTENER_FUNC_NON_NULL(listener);
 185
 186         /* Find the next available spot */
 187         for (i = 0; i < tc->destruction_listeners->len; i++) {
 188                 struct bt_trace_class_destruction_listener_elem elem =
 189                         g_array_index(tc->destruction_listeners,
 190                                 struct bt_trace_class_destruction_listener_elem, i);
 191
 192                 if (!elem.func) {
 193                         break;
 194                 }
 195         }
 196
 197         if (i == tc->destruction_listeners->len) {
 198                 g_array_append_val(tc->destruction_listeners, new_elem);
 199         } else {
 200                 g_array_insert_val(tc->destruction_listeners, i, new_elem);
 201         }
 202
 203         if (listener_id) {
 204                 *listener_id = i;
 205         }
 206
 207         BT_LIB_LOGD("Added trace class destruction listener: %![tc-]+T, "
 208                         "listener-id=%" PRIu64, tc, i);
 209         return BT_FUNC_STATUS_OK;
 210 }
 211
 212 static
 213 bool has_listener_id(const struct bt_trace_class *tc, uint64_t listener_id)
 214 {
 215         BT_ASSERT(listener_id < tc->destruction_listeners->len);
 216         return (&g_array_index(tc->destruction_listeners,
 217                         struct bt_trace_class_destruction_listener_elem,
 218                         listener_id))->func;
 219 }
 220
 221 enum bt_trace_class_remove_listener_status bt_trace_class_remove_destruction_listener(
 222                 const struct bt_trace_class *_tc, bt_listener_id listener_id)
 223 {
 224         struct bt_trace_class *tc = (void *) _tc;
 225         struct bt_trace_class_destruction_listener_elem *elem;
 226
 227         BT_ASSERT_PRE_NO_ERROR();
 228         BT_ASSERT_PRE_TC_NON_NULL(tc);
 229         BT_ASSERT_PRE("listener-id-exists",
 230                 has_listener_id(tc, listener_id),
 231                 "Trace class has no such trace class destruction listener ID: "
 232                 "%![tc-]+T, %" PRIu64, tc, listener_id);
 233         elem = &g_array_index(tc->destruction_listeners,
 234                         struct bt_trace_class_destruction_listener_elem,
 235                         listener_id);
 236         BT_ASSERT(elem->func);
 237
 238         elem->func = NULL;
 239         elem->data = NULL;
 240         BT_LIB_LOGD("Removed trace class destruction listener: "
 241                 "%![tc-]+T, listener-id=%" PRIu64,
 242                 tc, listener_id);
 243         return BT_FUNC_STATUS_OK;
 244 }
 245
 246 uint64_t bt_trace_class_get_stream_class_count(const struct bt_trace_class *tc)
 247 {
 248         BT_ASSERT_PRE_DEV_TC_NON_NULL(tc);
 249         return (uint64_t) tc->stream_classes->len;
 250 }
 251
 252 struct bt_stream_class *bt_trace_class_borrow_stream_class_by_index(
 253                 struct bt_trace_class *tc, uint64_t index)
 254 {
 255         BT_ASSERT_PRE_DEV_TC_NON_NULL(tc);
 256         BT_ASSERT_PRE_DEV_VALID_INDEX(index, tc->stream_classes->len);
 257         return g_ptr_array_index(tc->stream_classes, index);
 258 }
 259
 260 const struct bt_stream_class *
 261 bt_trace_class_borrow_stream_class_by_index_const(
 262                 const struct bt_trace_class *tc, uint64_t index)
 263 {
 264         return bt_trace_class_borrow_stream_class_by_index(
 265                 (void *) tc, index);
 266 }
 267
 268 struct bt_stream_class *bt_trace_class_borrow_stream_class_by_id(
 269                 struct bt_trace_class *tc, uint64_t id)
 270 {
 271         struct bt_stream_class *stream_class = NULL;
 272         uint64_t i;
 273
 274         BT_ASSERT_PRE_DEV_TC_NON_NULL(tc);
 275
 276         for (i = 0; i < tc->stream_classes->len; i++) {
 277                 struct bt_stream_class *stream_class_candidate =
 278                         g_ptr_array_index(tc->stream_classes, i);
 279
 280                 if (stream_class_candidate->id == id) {
 281                         stream_class = stream_class_candidate;
 282                         goto end;
 283                 }
 284         }
 285
 286 end:
 287         return stream_class;
 288 }
 289
 290 const struct bt_stream_class *
 291 bt_trace_class_borrow_stream_class_by_id_const(
 292                 const struct bt_trace_class *tc, uint64_t id)
 293 {
 294         return bt_trace_class_borrow_stream_class_by_id((void *) tc, id);
 295 }
 296
 297 BT_HIDDEN
 298 void _bt_trace_class_freeze(const struct bt_trace_class *tc)
 299 {
 300         BT_ASSERT(tc);
 301         BT_LIB_LOGD("Freezing trace class: %!+T", tc);
 302         ((struct bt_trace_class *) tc)->frozen = true;
 303 }
 304
 305 bt_bool bt_trace_class_assigns_automatic_stream_class_id(const struct bt_trace_class *tc)
 306 {
 307         BT_ASSERT_PRE_DEV_TC_NON_NULL(tc);
 308         return (bt_bool) tc->assigns_automatic_stream_class_id;
 309 }
 310
 311 void bt_trace_class_set_assigns_automatic_stream_class_id(struct bt_trace_class *tc,
 312                 bt_bool value)
 313 {
 314         BT_ASSERT_PRE_TC_NON_NULL(tc);
 315         BT_ASSERT_PRE_DEV_TRACE_CLASS_HOT(tc);
 316         tc->assigns_automatic_stream_class_id = (bool) value;
 317         BT_LIB_LOGD("Set trace class's automatic stream class ID "
 318                 "assignment property: %!+T", tc);
 319 }
 320
 321 const struct bt_value *bt_trace_class_borrow_user_attributes_const(
 322                 const struct bt_trace_class *trace_class)
 323 {
 324         BT_ASSERT_PRE_DEV_TC_NON_NULL(trace_class);
 325         return trace_class->user_attributes;
 326 }
 327
 328 struct bt_value *bt_trace_class_borrow_user_attributes(
 329                 struct bt_trace_class *trace_class)
 330 {
 331         return (void *) bt_trace_class_borrow_user_attributes_const(
 332                 (void *) trace_class);
 333 }
 334
 335 void bt_trace_class_set_user_attributes(struct bt_trace_class *trace_class,
 336                 const struct bt_value *user_attributes)
 337 {
 338         BT_ASSERT_PRE_TC_NON_NULL(trace_class);
 339         BT_ASSERT_PRE_USER_ATTRS_NON_NULL(user_attributes);
 340         BT_ASSERT_PRE_USER_ATTRS_IS_MAP(user_attributes);
 341         BT_ASSERT_PRE_DEV_TRACE_CLASS_HOT(trace_class);
 342         bt_object_put_ref_no_null_check(trace_class->user_attributes);
 343         trace_class->user_attributes = (void *) user_attributes;
 344         bt_object_get_ref_no_null_check(trace_class->user_attributes);
 345 }
 346
 347 void bt_trace_class_get_ref(const struct bt_trace_class *trace_class)
 348 {
 349         bt_object_get_ref(trace_class);
 350 }
 351
 352 void bt_trace_class_put_ref(const struct bt_trace_class *trace_class)
 353 {
 354         bt_object_put_ref(trace_class);
 355 }