src/lib/trace-ir/trace.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.h>
  29 #include <babeltrace2/trace-ir/trace-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 "attributes.h"
  47 #include "clock-class.h"
  48 #include "event-class.h"
  49 #include "event.h"
  50 #include "field-class.h"
  51 #include "field-wrapper.h"
  52 #include "resolve-field-path.h"
  53 #include "stream-class.h"
  54 #include "stream.h"
  55 #include "trace-class.h"
  56 #include "trace.h"
  57 #include "utils.h"
  58 #include "lib/func-status.h"
  59
  60 struct bt_trace_destruction_listener_elem {
  61         bt_trace_destruction_listener_func func;
  62         void *data;
  63 };
  64
  65 #define BT_ASSERT_PRE_TRACE_HOT(_trace) \
  66         BT_ASSERT_PRE_HOT((_trace), "Trace", ": %!+t", (_trace))
  67
  68 static
  69 void destroy_trace(struct bt_object *obj)
  70 {
  71         struct bt_trace *trace = (void *) obj;
  72
  73         BT_LIB_LOGD("Destroying trace object: %!+t", trace);
  74
  75         /*
  76          * Call destruction listener functions so that everything else
  77          * still exists in the trace.
  78          */
  79         if (trace->destruction_listeners) {
  80                 uint64_t i;
  81                 BT_LIB_LOGD("Calling trace destruction listener(s): %!+t", trace);
  82
  83                 /*
  84                 * The trace's reference count is 0 if we're here. Increment
  85                 * it to avoid a double-destroy (possibly infinitely recursive).
  86                 * This could happen for example if a destruction listener did
  87                 * bt_object_get_ref() (or anything that causes
  88                 * bt_object_get_ref() to be called) on the trace (ref.
  89                 * count goes from 0 to 1), and then bt_object_put_ref(): the
  90                 * reference count would go from 1 to 0 again and this function
  91                 * would be called again.
  92                 */
  93                 trace->base.ref_count++;
  94
  95                 /* Call all the trace destruction listeners */
  96                 for (i = 0; i < trace->destruction_listeners->len; i++) {
  97                         struct bt_trace_destruction_listener_elem elem =
  98                                 g_array_index(trace->destruction_listeners,
  99                                                 struct bt_trace_destruction_listener_elem, i);
 100
 101                         if (elem.func) {
 102                                 elem.func(trace, elem.data);
 103                         }
 104
 105                         /*
 106                          * The destruction listener should not have kept a
 107                          * reference to the trace.
 108                          */
 109                         BT_ASSERT_PRE(trace->base.ref_count == 1, "Destruction listener kept a reference to the trace being destroyed: %![trace-]+t", trace);
 110                 }
 111                 g_array_free(trace->destruction_listeners, TRUE);
 112                 trace->destruction_listeners = NULL;
 113         }
 114
 115         if (trace->name.str) {
 116                 g_string_free(trace->name.str, TRUE);
 117                 trace->name.str = NULL;
 118                 trace->name.value = NULL;
 119         }
 120
 121         if (trace->environment) {
 122                 BT_LOGD_STR("Destroying environment attributes.");
 123                 bt_attributes_destroy(trace->environment);
 124                 trace->environment = NULL;
 125         }
 126
 127         if (trace->streams) {
 128                 BT_LOGD_STR("Destroying streams.");
 129                 g_ptr_array_free(trace->streams, TRUE);
 130                 trace->streams = NULL;
 131         }
 132
 133         if (trace->stream_classes_stream_count) {
 134                 g_hash_table_destroy(trace->stream_classes_stream_count);
 135                 trace->stream_classes_stream_count = NULL;
 136         }
 137
 138         BT_LOGD_STR("Putting trace's class.");
 139         bt_object_put_ref(trace->class);
 140         trace->class = NULL;
 141         g_free(trace);
 142 }
 143
 144 struct bt_trace *bt_trace_create(struct bt_trace_class *tc)
 145 {
 146         struct bt_trace *trace = NULL;
 147
 148         BT_LIB_LOGD("Creating trace object: %![tc-]+T", tc);
 149         trace = g_new0(struct bt_trace, 1);
 150         if (!trace) {
 151                 BT_LIB_LOGE_APPEND_CAUSE("Failed to allocate one trace.");
 152                 goto error;
 153         }
 154
 155         bt_object_init_shared(&trace->base, destroy_trace);
 156         trace->streams = g_ptr_array_new_with_free_func(
 157                 (GDestroyNotify) bt_object_try_spec_release);
 158         if (!trace->streams) {
 159                 BT_LIB_LOGE_APPEND_CAUSE("Failed to allocate one GPtrArray.");
 160                 goto error;
 161         }
 162
 163         trace->stream_classes_stream_count = g_hash_table_new(g_direct_hash,
 164                 g_direct_equal);
 165         if (!trace->stream_classes_stream_count) {
 166                 BT_LIB_LOGE_APPEND_CAUSE("Failed to allocate one GHashTable.");
 167                 goto error;
 168         }
 169
 170         trace->name.str = g_string_new(NULL);
 171         if (!trace->name.str) {
 172                 BT_LIB_LOGE_APPEND_CAUSE("Failed to allocate one GString.");
 173                 goto error;
 174         }
 175
 176         trace->environment = bt_attributes_create();
 177         if (!trace->environment) {
 178                 BT_LIB_LOGE_APPEND_CAUSE("Cannot create empty attributes object.");
 179                 goto error;
 180         }
 181
 182         trace->destruction_listeners = g_array_new(FALSE, TRUE,
 183                 sizeof(struct bt_trace_destruction_listener_elem));
 184         if (!trace->destruction_listeners) {
 185                 BT_LIB_LOGE_APPEND_CAUSE("Failed to allocate one GArray.");
 186                 goto error;
 187         }
 188
 189         trace->class = tc;
 190         bt_object_get_no_null_check(trace->class);
 191         BT_LIB_LOGD("Created trace object: %!+t", trace);
 192         goto end;
 193
 194 error:
 195         BT_OBJECT_PUT_REF_AND_RESET(trace);
 196
 197 end:
 198         return trace;
 199 }
 200
 201 const char *bt_trace_get_name(const struct bt_trace *trace)
 202 {
 203         BT_ASSERT_PRE_NON_NULL(trace, "Trace");
 204         return trace->name.value;
 205 }
 206
 207 enum bt_trace_set_name_status bt_trace_set_name(struct bt_trace *trace,
 208                 const char *name)
 209 {
 210         BT_ASSERT_PRE_NON_NULL(trace, "Trace");
 211         BT_ASSERT_PRE_NON_NULL(name, "Name");
 212         BT_ASSERT_PRE_TRACE_HOT(trace);
 213         g_string_assign(trace->name.str, name);
 214         trace->name.value = trace->name.str->str;
 215         BT_LIB_LOGD("Set trace's name: %!+t", trace);
 216         return BT_FUNC_STATUS_OK;
 217 }
 218
 219 bt_uuid bt_trace_get_uuid(const struct bt_trace *trace)
 220 {
 221         BT_ASSERT_PRE_NON_NULL(trace, "Trace");
 222         return trace->uuid.value;
 223 }
 224
 225 void bt_trace_set_uuid(struct bt_trace *trace, bt_uuid uuid)
 226 {
 227         BT_ASSERT_PRE_NON_NULL(trace, "Trace");
 228         BT_ASSERT_PRE_NON_NULL(uuid, "UUID");
 229         BT_ASSERT_PRE_TRACE_HOT(trace);
 230         memcpy(trace->uuid.uuid, uuid, BABELTRACE_UUID_LEN);
 231         trace->uuid.value = trace->uuid.uuid;
 232         BT_LIB_LOGD("Set trace's UUID: %!+t", trace);
 233 }
 234
 235 BT_ASSERT_FUNC
 236 static
 237 bool trace_has_environment_entry(const struct bt_trace *trace, const char *name)
 238 {
 239         BT_ASSERT(trace);
 240
 241         return bt_attributes_borrow_field_value_by_name(
 242                 trace->environment, name) != NULL;
 243 }
 244
 245 static
 246 enum bt_trace_set_environment_entry_status set_environment_entry(
 247                 struct bt_trace *trace,
 248                 const char *name, struct bt_value *value)
 249 {
 250         int ret;
 251
 252         BT_ASSERT(trace);
 253         BT_ASSERT(name);
 254         BT_ASSERT(value);
 255         BT_ASSERT_PRE(!trace->frozen ||
 256                 !trace_has_environment_entry(trace, name),
 257                 "Trace is frozen: cannot replace environment entry: "
 258                 "%![trace-]+t, entry-name=\"%s\"", trace, name);
 259         ret = bt_attributes_set_field_value(trace->environment, name,
 260                 value);
 261         if (ret) {
 262                 ret = BT_FUNC_STATUS_MEMORY_ERROR;
 263                 BT_LIB_LOGE_APPEND_CAUSE(
 264                         "Cannot set trace's environment entry: "
 265                         "%![trace-]+t, entry-name=\"%s\"", trace, name);
 266         } else {
 267                 bt_value_freeze(value);
 268                 BT_LIB_LOGD("Set trace's environment entry: "
 269                         "%![trace-]+t, entry-name=\"%s\"", trace, name);
 270         }
 271
 272         return ret;
 273 }
 274
 275 enum bt_trace_set_environment_entry_status
 276 bt_trace_set_environment_entry_string(
 277                 struct bt_trace *trace, const char *name, const char *value)
 278 {
 279         int ret;
 280         struct bt_value *value_obj;
 281         BT_ASSERT_PRE_NON_NULL(trace, "Trace");
 282         BT_ASSERT_PRE_NON_NULL(name, "Name");
 283         BT_ASSERT_PRE_NON_NULL(value, "Value");
 284         value_obj = bt_value_string_create_init(value);
 285         if (!value_obj) {
 286                 BT_LIB_LOGE_APPEND_CAUSE(
 287                         "Cannot create a string value object.");
 288                 ret = -1;
 289                 goto end;
 290         }
 291
 292         /* set_environment_entry() logs errors */
 293         ret = set_environment_entry(trace, name, value_obj);
 294
 295 end:
 296         bt_object_put_ref(value_obj);
 297         return ret;
 298 }
 299
 300 enum bt_trace_set_environment_entry_status
 301 bt_trace_set_environment_entry_integer(
 302                 struct bt_trace *trace, const char *name, int64_t value)
 303 {
 304         int ret;
 305         struct bt_value *value_obj;
 306         BT_ASSERT_PRE_NON_NULL(trace, "Trace");
 307         BT_ASSERT_PRE_NON_NULL(name, "Name");
 308         value_obj = bt_value_signed_integer_create_init(value);
 309         if (!value_obj) {
 310                 BT_LIB_LOGE_APPEND_CAUSE(
 311                         "Cannot create an integer value object.");
 312                 ret = BT_FUNC_STATUS_MEMORY_ERROR;
 313                 goto end;
 314         }
 315
 316         /* set_environment_entry() logs errors */
 317         ret = set_environment_entry(trace, name, value_obj);
 318
 319 end:
 320         bt_object_put_ref(value_obj);
 321         return ret;
 322 }
 323
 324 uint64_t bt_trace_get_environment_entry_count(const struct bt_trace *trace)
 325 {
 326         int64_t ret;
 327
 328         BT_ASSERT_PRE_NON_NULL(trace, "Trace");
 329         ret = bt_attributes_get_count(trace->environment);
 330         BT_ASSERT(ret >= 0);
 331         return (uint64_t) ret;
 332 }
 333
 334 void bt_trace_borrow_environment_entry_by_index_const(
 335                 const struct bt_trace *trace, uint64_t index,
 336                 const char **name, const struct bt_value **value)
 337 {
 338         BT_ASSERT_PRE_NON_NULL(trace, "Trace");
 339         BT_ASSERT_PRE_NON_NULL(name, "Name");
 340         BT_ASSERT_PRE_NON_NULL(value, "Value");
 341         BT_ASSERT_PRE_VALID_INDEX(index,
 342                 bt_attributes_get_count(trace->environment));
 343         *value = bt_attributes_borrow_field_value(trace->environment, index);
 344         BT_ASSERT(*value);
 345         *name = bt_attributes_get_field_name(trace->environment, index);
 346         BT_ASSERT(*name);
 347 }
 348
 349 const struct bt_value *bt_trace_borrow_environment_entry_value_by_name_const(
 350                 const struct bt_trace *trace, const char *name)
 351 {
 352         BT_ASSERT_PRE_NON_NULL(trace, "Trace");
 353         BT_ASSERT_PRE_NON_NULL(name, "Name");
 354         return bt_attributes_borrow_field_value_by_name(trace->environment,
 355                 name);
 356 }
 357
 358 uint64_t bt_trace_get_stream_count(const struct bt_trace *trace)
 359 {
 360         BT_ASSERT_PRE_NON_NULL(trace, "Trace");
 361         return (uint64_t) trace->streams->len;
 362 }
 363
 364 struct bt_stream *bt_trace_borrow_stream_by_index(
 365                 struct bt_trace *trace, uint64_t index)
 366 {
 367         BT_ASSERT_PRE_NON_NULL(trace, "Trace");
 368         BT_ASSERT_PRE_VALID_INDEX(index, trace->streams->len);
 369         return g_ptr_array_index(trace->streams, index);
 370 }
 371
 372 const struct bt_stream *bt_trace_borrow_stream_by_index_const(
 373                 const struct bt_trace *trace, uint64_t index)
 374 {
 375         return bt_trace_borrow_stream_by_index((void *) trace, index);
 376 }
 377
 378 struct bt_stream *bt_trace_borrow_stream_by_id(struct bt_trace *trace,
 379                 uint64_t id)
 380 {
 381         struct bt_stream *stream = NULL;
 382         uint64_t i;
 383
 384         BT_ASSERT_PRE_NON_NULL(trace, "Trace");
 385
 386         for (i = 0; i < trace->streams->len; i++) {
 387                 struct bt_stream *stream_candidate =
 388                         g_ptr_array_index(trace->streams, i);
 389
 390                 if (stream_candidate->id == id) {
 391                         stream = stream_candidate;
 392                         goto end;
 393                 }
 394         }
 395
 396 end:
 397         return stream;
 398 }
 399
 400 const struct bt_stream *bt_trace_borrow_stream_by_id_const(
 401                 const struct bt_trace *trace, uint64_t id)
 402 {
 403         return bt_trace_borrow_stream_by_id((void *) trace, id);
 404 }
 405
 406 enum bt_trace_add_listener_status bt_trace_add_destruction_listener(
 407                 const struct bt_trace *c_trace,
 408                 bt_trace_destruction_listener_func listener,
 409                 void *data, uint64_t *listener_id)
 410 {
 411         struct bt_trace *trace = (void *) c_trace;
 412         uint64_t i;
 413         struct bt_trace_destruction_listener_elem new_elem = {
 414                 .func = listener,
 415                 .data = data,
 416         };
 417
 418         BT_ASSERT_PRE_NON_NULL(trace, "Trace");
 419         BT_ASSERT_PRE_NON_NULL(listener, "Listener");
 420
 421         /* Find the next available spot */
 422         for (i = 0; i < trace->destruction_listeners->len; i++) {
 423                 struct bt_trace_destruction_listener_elem elem =
 424                         g_array_index(trace->destruction_listeners,
 425                                 struct bt_trace_destruction_listener_elem, i);
 426
 427                 if (!elem.func) {
 428                         break;
 429                 }
 430         }
 431
 432         if (i == trace->destruction_listeners->len) {
 433                 g_array_append_val(trace->destruction_listeners, new_elem);
 434         } else {
 435                 g_array_insert_val(trace->destruction_listeners, i, new_elem);
 436         }
 437
 438         if (listener_id) {
 439                 *listener_id = i;
 440         }
 441
 442         BT_LIB_LOGD("Added destruction listener: " "%![trace-]+t, "
 443                         "listener-id=%" PRIu64, trace, i);
 444         return BT_FUNC_STATUS_OK;
 445 }
 446
 447 BT_ASSERT_PRE_FUNC
 448 static
 449 bool has_listener_id(const struct bt_trace *trace, uint64_t listener_id)
 450 {
 451         BT_ASSERT(listener_id < trace->destruction_listeners->len);
 452         return (&g_array_index(trace->destruction_listeners,
 453                         struct bt_trace_destruction_listener_elem,
 454                         listener_id))->func != NULL;
 455 }
 456
 457 enum bt_trace_remove_listener_status bt_trace_remove_destruction_listener(
 458                 const struct bt_trace *c_trace, uint64_t listener_id)
 459 {
 460         struct bt_trace *trace = (void *) c_trace;
 461         struct bt_trace_destruction_listener_elem *elem;
 462
 463         BT_ASSERT_PRE_NON_NULL(trace, "Trace");
 464         BT_ASSERT_PRE(has_listener_id(trace, listener_id),
 465                 "Trace has no such trace destruction listener ID: "
 466                 "%![trace-]+t, %" PRIu64, trace, listener_id);
 467         elem = &g_array_index(trace->destruction_listeners,
 468                         struct bt_trace_destruction_listener_elem,
 469                         listener_id);
 470         BT_ASSERT(elem->func);
 471
 472         elem->func = NULL;
 473         elem->data = NULL;
 474         BT_LIB_LOGD("Removed \"trace destruction listener: "
 475                 "%![trace-]+t, listener-id=%" PRIu64,
 476                 trace, listener_id);
 477         return BT_FUNC_STATUS_OK;
 478 }
 479
 480 BT_HIDDEN
 481 void _bt_trace_freeze(const struct bt_trace *trace)
 482 {
 483         BT_ASSERT(trace);
 484         BT_LIB_LOGD("Freezing trace's class: %!+T", trace->class);
 485         bt_trace_class_freeze(trace->class);
 486         BT_LIB_LOGD("Freezing trace: %!+t", trace);
 487         ((struct bt_trace *) trace)->frozen = true;
 488 }
 489
 490 BT_HIDDEN
 491 void bt_trace_add_stream(struct bt_trace *trace, struct bt_stream *stream)
 492 {
 493         guint count = 0;
 494
 495         bt_object_set_parent(&stream->base, &trace->base);
 496         g_ptr_array_add(trace->streams, stream);
 497         bt_trace_freeze(trace);
 498
 499         if (bt_g_hash_table_contains(trace->stream_classes_stream_count,
 500                         stream->class)) {
 501                 count = GPOINTER_TO_UINT(g_hash_table_lookup(
 502                         trace->stream_classes_stream_count, stream->class));
 503         }
 504
 505         g_hash_table_insert(trace->stream_classes_stream_count,
 506                 stream->class, GUINT_TO_POINTER(count + 1));
 507 }
 508
 509 BT_HIDDEN
 510 uint64_t bt_trace_get_automatic_stream_id(const struct bt_trace *trace,
 511                 const struct bt_stream_class *stream_class)
 512 {
 513         gpointer orig_key;
 514         gpointer value;
 515         uint64_t id = 0;
 516
 517         BT_ASSERT(stream_class);
 518         BT_ASSERT(trace);
 519         if (g_hash_table_lookup_extended(trace->stream_classes_stream_count,
 520                         stream_class, &orig_key, &value)) {
 521                 id = (uint64_t) GPOINTER_TO_UINT(value);
 522         }
 523
 524         return id;
 525 }
 526
 527 struct bt_trace_class *bt_trace_borrow_class(struct bt_trace *trace)
 528 {
 529         BT_ASSERT_PRE_NON_NULL(trace, "Trace");
 530         return trace->class;
 531 }
 532
 533 const struct bt_trace_class *bt_trace_borrow_class_const(
 534                 const struct bt_trace *trace)
 535 {
 536         return bt_trace_borrow_class((void *) trace);
 537 }
 538
 539 void bt_trace_get_ref(const struct bt_trace *trace)
 540 {
 541         bt_object_get_ref(trace);
 542 }
 543
 544 void bt_trace_put_ref(const struct bt_trace *trace)
 545 {
 546         bt_object_put_ref(trace);
 547 }