formats/ctf/callbacks.c

   1 /*
   2  * callbacks.c
   3  *
   4  * Babeltrace Library
   5  *
   6  * Copyright 2010-2011 EfficiOS Inc. and Linux Foundation
   7  *
   8  * Author: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   9  *
  10  * Permission is hereby granted, free of charge, to any person obtaining a copy
  11  * of this software and associated documentation files (the "Software"), to deal
  12  * in the Software without restriction, including without limitation the rights
  13  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  14  * copies of the Software, and to permit persons to whom the Software is
  15  * furnished to do so, subject to the following conditions:
  16  *
  17  * The above copyright notice and this permission notice shall be included in
  18  * all copies or substantial portions of the Software.
  19  */
  20
  21 #include <babeltrace/babeltrace.h>
  22 #include <babeltrace/babeltrace-internal.h>
  23 #include <babeltrace/context.h>
  24 #include <babeltrace/context-internal.h>
  25 #include <babeltrace/ctf-ir/metadata.h>
  26 #include <babeltrace/iterator-internal.h>
  27 #include <babeltrace/ctf/events.h>
  28 #include <babeltrace/ctf/events-internal.h>
  29 #include <babeltrace/ctf/callbacks-internal.h>
  30 #include <inttypes.h>
  31
  32 static
  33 struct bt_dependencies *_babeltrace_dependencies_create(const char *first,
  34                                                         va_list ap)
  35 {
  36         const char *iter;
  37         struct bt_dependencies *dep;
  38
  39         dep = g_new0(struct bt_dependencies, 1);
  40         dep->refcount = 1;
  41         dep->deps = g_array_new(FALSE, TRUE, sizeof(GQuark));
  42         iter = first;
  43         while (iter) {
  44                 GQuark q = g_quark_from_string(iter);
  45                 g_array_append_val(dep->deps, q);
  46                 iter = va_arg(ap, const char *);
  47         }
  48         return dep;
  49 }
  50
  51 struct bt_dependencies *babeltrace_dependencies_create(const char *first, ...)
  52 {
  53         va_list ap;
  54         struct bt_dependencies *deps;
  55
  56         va_start(ap, first);
  57         deps = _babeltrace_dependencies_create(first, ap);
  58         va_end(ap);
  59         return deps;
  60 }
  61
  62 /*
  63  * bt_ctf_iter_add_callback: Add a callback to CTF iterator.
  64  */
  65 int bt_ctf_iter_add_callback(struct bt_ctf_iter *iter,
  66                 bt_intern_str event, void *private_data, int flags,
  67                 enum bt_cb_ret (*callback)(struct bt_ctf_event *ctf_data,
  68                                            void *private_data),
  69                 struct bt_dependencies *depends,
  70                 struct bt_dependencies *weak_depends,
  71                 struct bt_dependencies *provides)
  72 {
  73         int i, stream_id;
  74         gpointer *event_id_ptr;
  75         unsigned long event_id;
  76         struct trace_collection *tc;
  77
  78         if (!iter || !callback)
  79                 return -EINVAL;
  80
  81         tc = iter->parent.ctx->tc;
  82         for (i = 0; i < tc->array->len; i++) {
  83                 struct ctf_trace *tin;
  84                 struct trace_descriptor *td_read;
  85
  86                 td_read = g_ptr_array_index(tc->array, i);
  87                 tin = container_of(td_read, struct ctf_trace, parent);
  88
  89                 for (stream_id = 0; stream_id < tin->streams->len; stream_id++) {
  90                         struct ctf_stream_declaration *stream;
  91                         struct bt_stream_callbacks *bt_stream_cb = NULL;
  92                         struct bt_callback_chain *bt_chain = NULL;
  93                         struct bt_callback new_callback;
  94
  95                         stream = g_ptr_array_index(tin->streams, stream_id);
  96
  97                         if (stream_id >= iter->callbacks->len) {
  98                                 g_array_set_size(iter->callbacks, stream->stream_id + 1);
  99                         }
 100                         bt_stream_cb = &g_array_index(iter->callbacks,
 101                                         struct bt_stream_callbacks, stream->stream_id);
 102                         if (!bt_stream_cb->per_id_callbacks) {
 103                                 bt_stream_cb->per_id_callbacks = g_array_new(FALSE, TRUE,
 104                                                 sizeof(struct bt_callback_chain));
 105                         }
 106
 107                         if (event) {
 108                                 /* find the event id */
 109                                 event_id_ptr = g_hash_table_lookup(stream->event_quark_to_id,
 110                                                 (gconstpointer) (unsigned long) event);
 111                                 /* event not found in this stream class */
 112                                 if (!event_id_ptr) {
 113                                         fprintf(stderr, "[error] Event ID not found in stream class\n");
 114                                         continue;
 115                                 }
 116                                 event_id = (uint64_t)(unsigned long) *event_id_ptr;
 117
 118                                 /* find or create the bt_callback_chain for this event */
 119                                 if (event_id >= bt_stream_cb->per_id_callbacks->len) {
 120                                         g_array_set_size(bt_stream_cb->per_id_callbacks, event_id + 1);
 121                                 }
 122                                 bt_chain = &g_array_index(bt_stream_cb->per_id_callbacks,
 123                                                 struct bt_callback_chain, event_id);
 124                                 if (!bt_chain->callback) {
 125                                         bt_chain->callback = g_array_new(FALSE, TRUE,
 126                                                 sizeof(struct bt_callback));
 127                                 }
 128                         } else {
 129                                 /* callback for all events */
 130                                 if (!iter->main_callbacks.callback) {
 131                                         iter->main_callbacks.callback = g_array_new(FALSE, TRUE,
 132                                                         sizeof(struct bt_callback));
 133                                 }
 134                                 bt_chain = &iter->main_callbacks;
 135                         }
 136
 137                         new_callback.private_data = private_data;
 138                         new_callback.flags = flags;
 139                         new_callback.callback = callback;
 140                         new_callback.depends = depends;
 141                         new_callback.weak_depends = weak_depends;
 142                         new_callback.provides = provides;
 143
 144                         /* TODO : take care of priority, for now just FIFO */
 145                         g_array_append_val(bt_chain->callback, new_callback);
 146                 }
 147         }
 148
 149         return 0;
 150 }
 151
 152 static
 153 int extract_ctf_stream_event(struct ctf_stream_definition *stream,
 154                 struct bt_ctf_event *event)
 155 {
 156         struct ctf_stream_declaration *stream_class = stream->stream_class;
 157         struct ctf_event_declaration *event_class;
 158         uint64_t id = stream->event_id;
 159
 160         if (id >= stream_class->events_by_id->len) {
 161                 fprintf(stderr, "[error] Event id %" PRIu64 " is outside range.\n", id);
 162                 return -1;
 163         }
 164         event->parent = g_ptr_array_index(stream->events_by_id, id);
 165         if (!event->parent) {
 166                 fprintf(stderr, "[error] Event id %" PRIu64 " is unknown.\n", id);
 167                 return -1;
 168         }
 169         event_class = g_ptr_array_index(stream_class->events_by_id, id);
 170         if (!event_class) {
 171                 fprintf(stderr, "[error] Event id %" PRIu64 " is unknown.\n", id);
 172                 return -1;
 173         }
 174
 175         return 0;
 176 }
 177
 178 void process_callbacks(struct bt_ctf_iter *iter,
 179                        struct ctf_stream_definition *stream)
 180 {
 181         struct bt_stream_callbacks *bt_stream_cb;
 182         struct bt_callback_chain *bt_chain;
 183         struct bt_callback *cb;
 184         int i;
 185         enum bt_cb_ret ret;
 186         struct bt_ctf_event ctf_data;
 187
 188         assert(iter && stream);
 189
 190         ret = extract_ctf_stream_event(stream, &ctf_data);
 191
 192         /* process all events callback first */
 193         if (iter->main_callbacks.callback) {
 194                 for (i = 0; i < iter->main_callbacks.callback->len; i++) {
 195                         cb = &g_array_index(iter->main_callbacks.callback, struct bt_callback, i);
 196                         if (!cb)
 197                                 goto end;
 198                         ret = cb->callback(&ctf_data, cb->private_data);
 199                         switch (ret) {
 200                         case BT_CB_OK_STOP:
 201                         case BT_CB_ERROR_STOP:
 202                                 goto end;
 203                         default:
 204                                 break;
 205                         }
 206                 }
 207         }
 208
 209         /* process per event callbacks */
 210         bt_stream_cb = &g_array_index(iter->callbacks,
 211                         struct bt_stream_callbacks, stream->stream_id);
 212         if (!bt_stream_cb || !bt_stream_cb->per_id_callbacks)
 213                 goto end;
 214
 215         if (stream->event_id >= bt_stream_cb->per_id_callbacks->len)
 216                 goto end;
 217         bt_chain = &g_array_index(bt_stream_cb->per_id_callbacks,
 218                         struct bt_callback_chain, stream->event_id);
 219         if (!bt_chain || !bt_chain->callback)
 220                 goto end;
 221
 222         for (i = 0; i < bt_chain->callback->len; i++) {
 223                 cb = &g_array_index(bt_chain->callback, struct bt_callback, i);
 224                 if (!cb)
 225                         goto end;
 226                 ret = cb->callback(&ctf_data, cb->private_data);
 227                 switch (ret) {
 228                 case BT_CB_OK_STOP:
 229                 case BT_CB_ERROR_STOP:
 230                         goto end;
 231                 default:
 232                         break;
 233                 }
 234         }
 235
 236 end:
 237         return;
 238 }