Fix: incorrect compiler warning
[babeltrace.git] / formats / ctf / iterator.c
... / ...
CommitLineData
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 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
22 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
23 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
24 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
25 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
26 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
27 * SOFTWARE.
28 */
29
30#include <babeltrace/babeltrace.h>
31#include <babeltrace/format.h>
32#include <babeltrace/ctf/events.h>
33#include <babeltrace/ctf-ir/metadata.h>
34#include <babeltrace/prio_heap.h>
35#include <babeltrace/iterator-internal.h>
36#include <babeltrace/ctf/events-internal.h>
37#include <babeltrace/ctf/metadata.h>
38#include <glib.h>
39
40#include "events-private.h"
41
42struct bt_ctf_iter *bt_ctf_iter_create(struct bt_context *ctx,
43 const struct bt_iter_pos *begin_pos,
44 const struct bt_iter_pos *end_pos)
45{
46 struct bt_ctf_iter *iter;
47 int ret;
48
49 if (!ctx)
50 return NULL;
51
52 iter = g_new0(struct bt_ctf_iter, 1);
53 ret = bt_iter_init(&iter->parent, ctx, begin_pos, end_pos);
54 if (ret) {
55 g_free(iter);
56 return NULL;
57 }
58 iter->callbacks = g_array_new(FALSE, TRUE,
59 sizeof(struct bt_stream_callbacks));
60 iter->recalculate_dep_graph = 0;
61 iter->main_callbacks.callback = NULL;
62 iter->dep_gc = g_ptr_array_new();
63 return iter;
64}
65
66void bt_ctf_iter_destroy(struct bt_ctf_iter *iter)
67{
68 struct bt_stream_callbacks *bt_stream_cb;
69 struct bt_callback_chain *bt_chain;
70 int i, j;
71
72 assert(iter);
73
74 /* free all events callbacks */
75 if (iter->main_callbacks.callback)
76 g_array_free(iter->main_callbacks.callback, TRUE);
77
78 /* free per-event callbacks */
79 for (i = 0; i < iter->callbacks->len; i++) {
80 bt_stream_cb = &g_array_index(iter->callbacks,
81 struct bt_stream_callbacks, i);
82 if (!bt_stream_cb || !bt_stream_cb->per_id_callbacks)
83 continue;
84 for (j = 0; j < bt_stream_cb->per_id_callbacks->len; j++) {
85 bt_chain = &g_array_index(bt_stream_cb->per_id_callbacks,
86 struct bt_callback_chain, j);
87 if (bt_chain->callback) {
88 g_array_free(bt_chain->callback, TRUE);
89 }
90 }
91 g_array_free(bt_stream_cb->per_id_callbacks, TRUE);
92 }
93 g_array_free(iter->callbacks, TRUE);
94 g_ptr_array_free(iter->dep_gc, TRUE);
95
96 bt_iter_fini(&iter->parent);
97 g_free(iter);
98}
99
100struct bt_iter *bt_ctf_get_iter(struct bt_ctf_iter *iter)
101{
102 if (!iter)
103 return NULL;
104
105 return &iter->parent;
106}
107
108struct bt_ctf_event *bt_ctf_iter_read_event_flags(struct bt_ctf_iter *iter,
109 int *flags)
110{
111 struct ctf_file_stream *file_stream;
112 struct bt_ctf_event *ret;
113 struct ctf_stream_definition *stream;
114 struct packet_index *packet_index;
115
116 /*
117 * We do not want to fail for any other reason than end of
118 * trace, hence the assert.
119 */
120 assert(iter);
121
122 if (flags)
123 *flags = 0;
124
125 ret = &iter->current_ctf_event;
126 file_stream = bt_heap_maximum(iter->parent.stream_heap);
127 if (!file_stream) {
128 /* end of file for all streams */
129 goto stop;
130 }
131
132 /*
133 * If the packet is empty (contains only headers or is of size 0), the
134 * caller has to know that we can't read the current event and we need
135 * to do a bt_iter_next.
136 */
137 if (file_stream->pos.data_offset == file_stream->pos.content_size
138 || file_stream->pos.content_size == 0) {
139 /* More events may come. */
140 ret = NULL;
141 if (flags)
142 *flags |= BT_ITER_FLAG_RETRY;
143 goto end;
144 }
145
146 stream = &file_stream->parent;
147 if (iter->parent.end_pos &&
148 iter->parent.end_pos->type == BT_SEEK_TIME &&
149 stream->real_timestamp > iter->parent.end_pos->u.seek_time) {
150 goto stop;
151 }
152 ret->parent = g_ptr_array_index(stream->events_by_id,
153 stream->event_id);
154
155 if (!file_stream->pos.packet_index)
156 packet_index = NULL;
157 else
158 packet_index = &g_array_index(file_stream->pos.packet_index,
159 struct packet_index, file_stream->pos.cur_index);
160 iter->events_lost = 0;
161 if (packet_index && packet_index->events_discarded >
162 file_stream->pos.last_events_discarded) {
163 if (flags)
164 *flags |= BT_ITER_FLAG_LOST_EVENTS;
165 iter->events_lost += packet_index->events_discarded -
166 file_stream->pos.last_events_discarded;
167 file_stream->pos.last_events_discarded =
168 packet_index->events_discarded;
169 }
170
171 if (ret->parent->stream->stream_id > iter->callbacks->len)
172 goto end;
173
174 process_callbacks(iter, ret->parent->stream);
175
176end:
177 return ret;
178stop:
179 return NULL;
180}
181
182struct bt_ctf_event *bt_ctf_iter_read_event(struct bt_ctf_iter *iter)
183{
184 return bt_ctf_iter_read_event_flags(iter, NULL);
185}
186
187uint64_t bt_ctf_get_lost_events_count(struct bt_ctf_iter *iter)
188{
189 if (!iter)
190 return -1ULL;
191
192 return iter->events_lost;
193}
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