formats/ctf/iterator.c

   1 /*
   2  * ctf/iterator.c
   3  *
   4  * Babeltrace Library
   5  *
   6  * Copyright 2011-2012 EfficiOS Inc. and Linux Foundation
   7  *
   8  * Author: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   9  *         Julien Desfossez <julien.desfossez@efficios.com>
  10  *
  11  * Permission is hereby granted, free of charge, to any person obtaining a copy
  12  * of this software and associated documentation files (the "Software"), to deal
  13  * in the Software without restriction, including without limitation the rights
  14  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  15  * copies of the Software, and to permit persons to whom the Software is
  16  * furnished to do so, subject to the following conditions:
  17  *
  18  * The above copyright notice and this permission notice shall be included in
  19  * all copies or substantial portions of the Software.
  20  */
  21
  22 #include <babeltrace/babeltrace.h>
  23 #include <babeltrace/format.h>
  24 #include <babeltrace/ctf/events.h>
  25 #include <babeltrace/ctf-ir/metadata.h>
  26 #include <babeltrace/prio_heap.h>
  27 #include <babeltrace/iterator-internal.h>
  28 #include <babeltrace/ctf/events-internal.h>
  29 #include <babeltrace/ctf/metadata.h>
  30 #include <glib.h>
  31
  32 #include "events-private.h"
  33
  34 struct bt_ctf_iter *bt_ctf_iter_create(struct bt_context *ctx,
  35                 const struct bt_iter_pos *begin_pos,
  36                 const struct bt_iter_pos *end_pos)
  37 {
  38         struct bt_ctf_iter *iter;
  39         int ret;
  40
  41         if (!ctx)
  42                 return NULL;
  43
  44         iter = g_new0(struct bt_ctf_iter, 1);
  45         ret = bt_iter_init(&iter->parent, ctx, begin_pos, end_pos);
  46         if (ret) {
  47                 g_free(iter);
  48                 return NULL;
  49         }
  50         iter->callbacks = g_array_new(0, 1, sizeof(struct bt_stream_callbacks));
  51         iter->recalculate_dep_graph = 0;
  52         iter->main_callbacks.callback = NULL;
  53         iter->dep_gc = g_ptr_array_new();
  54         return iter;
  55 }
  56
  57 void bt_ctf_iter_destroy(struct bt_ctf_iter *iter)
  58 {
  59         struct bt_stream_callbacks *bt_stream_cb;
  60         struct bt_callback_chain *bt_chain;
  61         int i, j;
  62
  63         assert(iter);
  64
  65         /* free all events callbacks */
  66         if (iter->main_callbacks.callback)
  67                 g_array_free(iter->main_callbacks.callback, TRUE);
  68
  69         /* free per-event callbacks */
  70         for (i = 0; i < iter->callbacks->len; i++) {
  71                 bt_stream_cb = &g_array_index(iter->callbacks,
  72                                 struct bt_stream_callbacks, i);
  73                 if (!bt_stream_cb || !bt_stream_cb->per_id_callbacks)
  74                         continue;
  75                 for (j = 0; j < bt_stream_cb->per_id_callbacks->len; j++) {
  76                         bt_chain = &g_array_index(bt_stream_cb->per_id_callbacks,
  77                                         struct bt_callback_chain, j);
  78                         if (bt_chain->callback) {
  79                                 g_array_free(bt_chain->callback, TRUE);
  80                         }
  81                 }
  82                 g_array_free(bt_stream_cb->per_id_callbacks, TRUE);
  83         }
  84
  85         bt_iter_fini(&iter->parent);
  86         g_free(iter);
  87 }
  88
  89 struct bt_iter *bt_ctf_get_iter(struct bt_ctf_iter *iter)
  90 {
  91         if (!iter)
  92                 return NULL;
  93
  94         return &iter->parent;
  95 }
  96
  97 struct bt_ctf_event *bt_ctf_iter_read_event_flags(struct bt_ctf_iter *iter,
  98                 int *flags)
  99 {
 100         struct ctf_file_stream *file_stream;
 101         struct bt_ctf_event *ret;
 102         struct ctf_stream_definition *stream;
 103         struct packet_index *packet_index;
 104
 105         /*
 106          * We do not want to fail for any other reason than end of
 107          * trace, hence the assert.
 108          */
 109         assert(iter);
 110
 111         ret = &iter->current_ctf_event;
 112         file_stream = heap_maximum(iter->parent.stream_heap);
 113         if (!file_stream) {
 114                 /* end of file for all streams */
 115                 goto stop;
 116         }
 117         stream = &file_stream->parent;
 118         ret->parent = g_ptr_array_index(stream->events_by_id,
 119                         stream->event_id);
 120
 121         if (flags)
 122                 *flags = 0;
 123         if (!file_stream->pos.packet_cycles_index)
 124                 packet_index = NULL;
 125         else
 126                 packet_index = &g_array_index(file_stream->pos.packet_cycles_index,
 127                                 struct packet_index, file_stream->pos.cur_index);
 128         iter->events_lost = 0;
 129         if (packet_index && packet_index->events_discarded >
 130                         file_stream->pos.last_events_discarded) {
 131                 if (flags)
 132                         *flags |= BT_ITER_FLAG_LOST_EVENTS;
 133                 iter->events_lost += packet_index->events_discarded -
 134                         file_stream->pos.last_events_discarded;
 135                 file_stream->pos.last_events_discarded =
 136                         packet_index->events_discarded;
 137         }
 138
 139         if (ret->parent->stream->stream_id > iter->callbacks->len)
 140                 goto end;
 141
 142         process_callbacks(iter, ret->parent->stream);
 143
 144 end:
 145         return ret;
 146 stop:
 147         return NULL;
 148 }
 149
 150 struct bt_ctf_event *bt_ctf_iter_read_event(struct bt_ctf_iter *iter)
 151 {
 152         return bt_ctf_iter_read_event_flags(iter, NULL);
 153 }
 154
 155 uint64_t bt_ctf_get_lost_events_count(struct bt_ctf_iter *iter)
 156 {
 157         if (!iter)
 158                 return -1ULL;
 159
 160         return iter->events_lost;
 161 }