Add a by-address equality short-circuit to condition comparison
[lttng-tools.git] / src / common / condition.c
1 /*
2 * Copyright (C) 2017 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
3 *
4 * This library is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU Lesser General Public License, version 2.1 only,
6 * as published by the Free Software Foundation.
7 *
8 * This library is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
11 * for more details.
12 *
13 * You should have received a copy of the GNU Lesser General Public License
14 * along with this library; if not, write to the Free Software Foundation,
15 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
16 */
17
18 #include <lttng/condition/condition-internal.h>
19 #include <lttng/condition/buffer-usage-internal.h>
20 #include <lttng/condition/session-consumed-size-internal.h>
21 #include <common/macros.h>
22 #include <common/error.h>
23 #include <common/dynamic-buffer.h>
24 #include <common/buffer-view.h>
25 #include <stdbool.h>
26 #include <assert.h>
27
28 enum lttng_condition_type lttng_condition_get_type(
29 const struct lttng_condition *condition)
30 {
31 return condition ? condition->type : LTTNG_CONDITION_TYPE_UNKNOWN;
32 }
33
34 void lttng_condition_destroy(struct lttng_condition *condition)
35 {
36 if (!condition) {
37 return;
38 }
39
40 assert(condition->destroy);
41 condition->destroy(condition);
42 }
43
44 LTTNG_HIDDEN
45 bool lttng_condition_validate(const struct lttng_condition *condition)
46 {
47 bool valid;
48
49 if (!condition) {
50 valid = false;
51 goto end;
52 }
53
54 if (!condition->validate) {
55 /* Sub-class guarantees that it can never be invalid. */
56 valid = true;
57 goto end;
58 }
59
60 valid = condition->validate(condition);
61 end:
62 return valid;
63 }
64
65 LTTNG_HIDDEN
66 int lttng_condition_serialize(const struct lttng_condition *condition,
67 struct lttng_dynamic_buffer *buf)
68 {
69 int ret;
70 struct lttng_condition_comm condition_comm = { 0 };
71
72 if (!condition) {
73 ret = -1;
74 goto end;
75 }
76
77 condition_comm.condition_type = (int8_t) condition->type;
78
79 ret = lttng_dynamic_buffer_append(buf, &condition_comm,
80 sizeof(condition_comm));
81 if (ret) {
82 goto end;
83 }
84
85 ret = condition->serialize(condition, buf);
86 if (ret) {
87 goto end;
88 }
89 end:
90 return ret;
91 }
92
93 LTTNG_HIDDEN
94 bool lttng_condition_is_equal(const struct lttng_condition *a,
95 const struct lttng_condition *b)
96 {
97 bool is_equal = false;
98
99 if (!a || !b) {
100 goto end;
101 }
102
103 if (a->type != b->type) {
104 goto end;
105 }
106
107 if (a == b) {
108 is_equal = true;
109 goto end;
110 }
111
112 is_equal = a->equal ? a->equal(a, b) : true;
113 end:
114 return is_equal;
115 }
116
117 LTTNG_HIDDEN
118 ssize_t lttng_condition_create_from_buffer(
119 const struct lttng_buffer_view *buffer,
120 struct lttng_condition **condition)
121 {
122 ssize_t ret, condition_size = 0;
123 const struct lttng_condition_comm *condition_comm;
124 condition_create_from_buffer_cb create_from_buffer = NULL;
125
126 if (!buffer || !condition) {
127 ret = -1;
128 goto end;
129 }
130
131 DBG("Deserializing condition from buffer");
132 condition_comm = (const struct lttng_condition_comm *) buffer->data;
133 condition_size += sizeof(*condition_comm);
134
135 switch ((enum lttng_condition_type) condition_comm->condition_type) {
136 case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW:
137 create_from_buffer = lttng_condition_buffer_usage_low_create_from_buffer;
138 break;
139 case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH:
140 create_from_buffer = lttng_condition_buffer_usage_high_create_from_buffer;
141 break;
142 case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE:
143 create_from_buffer = lttng_condition_session_consumed_size_create_from_buffer;
144 break;
145 default:
146 ERR("Attempted to create condition of unknown type (%i)",
147 (int) condition_comm->condition_type);
148 ret = -1;
149 goto end;
150 }
151
152 if (create_from_buffer) {
153 const struct lttng_buffer_view view =
154 lttng_buffer_view_from_view(buffer,
155 sizeof(*condition_comm), -1);
156
157 ret = create_from_buffer(&view, condition);
158 if (ret < 0) {
159 goto end;
160 }
161 condition_size += ret;
162
163 } else {
164 abort();
165 }
166
167 ret = condition_size;
168 end:
169 return ret;
170 }
171
172 LTTNG_HIDDEN
173 void lttng_condition_init(struct lttng_condition *condition,
174 enum lttng_condition_type type)
175 {
176 condition->type = type;
177 }
This page took 0.049818 seconds and 6 git commands to generate.