2 * Copyright 2016-2018 Philippe Proulx <pproulx@efficios.com>
4 * Permission is hereby granted, free of charge, to any person obtaining a copy
5 * of this software and associated documentation files (the "Software"), to deal
6 * in the Software without restriction, including without limitation the rights
7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8 * copies of the Software, and to permit persons to whom the Software is
9 * furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
23 #define BT_LOG_TAG "PACKET"
24 #include <babeltrace2/lib-logging-internal.h>
26 #include <babeltrace2/assert-pre-internal.h>
27 #include <babeltrace2/trace-ir/field-internal.h>
28 #include <babeltrace2/trace-ir/packet-const.h>
29 #include <babeltrace2/trace-ir/packet.h>
30 #include <babeltrace2/trace-ir/packet-internal.h>
31 #include <babeltrace2/trace-ir/field-wrapper-internal.h>
32 #include <babeltrace2/trace-ir/trace.h>
33 #include <babeltrace2/trace-ir/stream-class-internal.h>
34 #include <babeltrace2/trace-ir/stream-class.h>
35 #include <babeltrace2/trace-ir/stream.h>
36 #include <babeltrace2/trace-ir/stream-internal.h>
37 #include <babeltrace2/trace-ir/trace-internal.h>
38 #include <babeltrace2/object-internal.h>
39 #include <babeltrace2/assert-internal.h>
42 #define BT_ASSERT_PRE_PACKET_HOT(_packet) \
43 BT_ASSERT_PRE_HOT((_packet), "Packet", ": %!+a", (_packet))
45 struct bt_stream
*bt_packet_borrow_stream(struct bt_packet
*packet
)
47 BT_ASSERT_PRE_NON_NULL(packet
, "Packet");
48 return packet
->stream
;
51 const struct bt_stream
*bt_packet_borrow_stream_const(
52 const struct bt_packet
*packet
)
54 return bt_packet_borrow_stream((void *) packet
);
57 struct bt_field
*bt_packet_borrow_context_field(struct bt_packet
*packet
)
59 BT_ASSERT_PRE_NON_NULL(packet
, "Packet");
60 return packet
->context_field
? packet
->context_field
->field
: NULL
;
63 const struct bt_field
*bt_packet_borrow_context_field_const(
64 const struct bt_packet
*packet
)
66 return bt_packet_borrow_context_field((void *) packet
);
70 void _bt_packet_set_is_frozen(const struct bt_packet
*packet
, bool is_frozen
)
76 BT_LIB_LOGD("Setting packet's frozen state: %![packet-]+a, "
77 "is-frozen=%d", packet
, is_frozen
);
79 if (packet
->context_field
) {
80 BT_LOGD_STR("Setting packet's context field's frozen state.");
81 bt_field_set_is_frozen(packet
->context_field
->field
,
85 ((struct bt_packet
*) packet
)->frozen
= is_frozen
;
89 void reset_packet(struct bt_packet
*packet
)
92 BT_LIB_LOGD("Resetting packet: %!+a", packet
);
93 bt_packet_set_is_frozen(packet
, false);
95 if (packet
->context_field
) {
96 bt_field_set_is_frozen(packet
->context_field
->field
, false);
97 bt_field_reset(packet
->context_field
->field
);
102 void recycle_context_field(struct bt_field_wrapper
*context_field
,
103 struct bt_stream_class
*stream_class
)
105 BT_ASSERT(context_field
);
106 BT_LIB_LOGD("Recycling packet context field: "
107 "addr=%p, %![sc-]+S, %![field-]+f", context_field
,
108 stream_class
, context_field
->field
);
109 bt_object_pool_recycle_object(&stream_class
->packet_context_field_pool
,
114 void bt_packet_recycle(struct bt_packet
*packet
)
116 struct bt_stream
*stream
;
119 BT_LIB_LOGD("Recycling packet: %!+a", packet
);
122 * Those are the important ordered steps:
124 * 1. Reset the packet object (put any permanent reference it
125 * has, unfreeze it and its fields in developer mode, etc.),
126 * but do NOT put its stream's reference. This stream
127 * contains the pool to which we're about to recycle this
128 * packet object, so we must guarantee its existence thanks
129 * to this existing reference.
131 * 2. Move the stream reference to our `stream`
132 * variable so that we can set the packet's stream member
133 * to NULL before recycling it. We CANNOT do this after
134 * we put the stream reference because this bt_object_put_ref()
135 * could destroy the stream, also destroying its
136 * packet pool, thus also destroying our packet object (this
137 * would result in an invalid write access).
139 * 3. Recycle the packet object.
141 * 4. Put our stream reference.
143 reset_packet(packet
);
144 stream
= packet
->stream
;
146 packet
->stream
= NULL
;
147 bt_object_pool_recycle_object(&stream
->packet_pool
, packet
);
148 bt_object_put_no_null_check(&stream
->base
);
152 void bt_packet_destroy(struct bt_packet
*packet
)
154 BT_LIB_LOGD("Destroying packet: %!+a", packet
);
156 if (packet
->context_field
) {
157 if (packet
->stream
) {
158 BT_LOGD_STR("Recycling packet's context field.");
159 recycle_context_field(packet
->context_field
,
160 packet
->stream
->class);
162 bt_field_wrapper_destroy(packet
->context_field
);
165 packet
->context_field
= NULL
;
168 BT_LOGD_STR("Putting packet's stream.");
169 BT_OBJECT_PUT_REF_AND_RESET(packet
->stream
);
174 struct bt_packet
*bt_packet_new(struct bt_stream
*stream
)
176 struct bt_packet
*packet
= NULL
;
177 struct bt_trace_class
*trace_class
= NULL
;
180 BT_LIB_LOGD("Creating packet object: %![stream-]+s", stream
);
181 packet
= g_new0(struct bt_packet
, 1);
183 BT_LOGE_STR("Failed to allocate one packet object.");
187 bt_object_init_shared(&packet
->base
,
188 (bt_object_release_func
) bt_packet_recycle
);
189 packet
->stream
= stream
;
190 bt_object_get_no_null_check(stream
);
191 trace_class
= bt_stream_class_borrow_trace_class_inline(stream
->class);
192 BT_ASSERT(trace_class
);
194 if (stream
->class->packet_context_fc
) {
195 BT_LOGD_STR("Creating initial packet context field.");
196 packet
->context_field
= bt_field_wrapper_create(
197 &stream
->class->packet_context_field_pool
,
198 stream
->class->packet_context_fc
);
199 if (!packet
->context_field
) {
200 BT_LOGE_STR("Cannot create packet context field wrapper.");
205 BT_LIB_LOGD("Created packet object: %!+a", packet
);
209 BT_OBJECT_PUT_REF_AND_RESET(packet
);
215 struct bt_packet
*bt_packet_create(const struct bt_stream
*c_stream
)
217 struct bt_packet
*packet
= NULL
;
218 struct bt_stream
*stream
= (void *) c_stream
;
220 BT_ASSERT_PRE_NON_NULL(stream
, "Stream");
221 packet
= bt_object_pool_create_object(&stream
->packet_pool
);
222 if (unlikely(!packet
)) {
223 BT_LIB_LOGE("Cannot allocate one packet from stream's packet pool: "
224 "%![stream-]+s", stream
);
228 if (likely(!packet
->stream
)) {
229 packet
->stream
= stream
;
230 bt_object_get_no_null_check_no_parent_check(
231 &packet
->stream
->base
);
235 return (void *) packet
;
238 enum bt_packet_status
bt_packet_move_context_field(struct bt_packet
*packet
,
239 struct bt_packet_context_field
*context_field
)
241 struct bt_stream_class
*stream_class
;
242 struct bt_field_wrapper
*field_wrapper
= (void *) context_field
;
244 BT_ASSERT_PRE_NON_NULL(packet
, "Packet");
245 BT_ASSERT_PRE_NON_NULL(field_wrapper
, "Context field");
246 BT_ASSERT_PRE_HOT(packet
, "Packet", ": %!+a", packet
);
247 stream_class
= packet
->stream
->class;
248 BT_ASSERT_PRE(stream_class
->packet_context_fc
,
249 "Stream class has no packet context field class: %!+S",
251 BT_ASSERT_PRE(field_wrapper
->field
->class ==
252 stream_class
->packet_context_fc
,
253 "Unexpected packet context field's class: "
254 "%![fc-]+F, %![expected-fc-]+F", field_wrapper
->field
->class,
255 stream_class
->packet_context_fc
);
257 /* Recycle current context field: always exists */
258 BT_ASSERT(packet
->context_field
);
259 recycle_context_field(packet
->context_field
, stream_class
);
262 packet
->context_field
= field_wrapper
;
263 return BT_PACKET_STATUS_OK
;
266 void bt_packet_get_ref(const struct bt_packet
*packet
)
268 bt_object_get_ref(packet
);
271 void bt_packet_put_ref(const struct bt_packet
*packet
)
273 bt_object_put_ref(packet
);