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1 | /* |
2 | * Copyright (C) 2018 - Francis Deslauriers <francis.deslauriers@efficios.com> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU General Public License, version 2 only, as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program 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 General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program; if not, write to the Free Software Foundation, Inc., 51 | |
15 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
16 | */ | |
17 | ||
18 | #include <stdbool.h> | |
19 | #include <string.h> | |
20 | ||
21 | #include "ust-field-utils.h" | |
22 | ||
23 | /* | |
24 | * The ustctl_field is made of a combination of C basic types | |
25 | * ustctl_basic_type and _ustctl_basic_type. | |
26 | * | |
27 | * ustctl_basic_type contains an enumeration describing the abstract type. | |
28 | * _ustctl_basic_type does _NOT_ contain an enumeration describing the | |
29 | * abstract type. | |
30 | * | |
31 | * A layer is needed to use the same code for both structures. | |
32 | * When dealing with _ustctl_basic_type, we need to use the abstract type of | |
33 | * the ustctl_type struct. | |
34 | */ | |
35 | ||
36 | /* | |
37 | * Compare two ustctl_integer_type fields. | |
38 | * Returns 1 if both are identical. | |
39 | */ | |
40 | static bool match_ustctl_field_integer(const struct ustctl_integer_type *first, | |
41 | const struct ustctl_integer_type *second) | |
42 | { | |
43 | if (first->size != second->size) { | |
44 | goto no_match; | |
45 | } | |
46 | if (first->alignment != second->alignment) { | |
47 | goto no_match; | |
48 | } | |
49 | if (first->signedness != second->signedness) { | |
50 | goto no_match; | |
51 | } | |
52 | if (first->encoding != second->encoding) { | |
53 | goto no_match; | |
54 | } | |
55 | if (first->base != second->base) { | |
56 | goto no_match; | |
57 | } | |
58 | if (first->reverse_byte_order != second->reverse_byte_order) { | |
59 | goto no_match; | |
60 | } | |
61 | ||
62 | return true; | |
63 | ||
64 | no_match: | |
65 | return false; | |
66 | } | |
67 | ||
68 | /* | |
69 | * Compare two _ustctl_basic_type fields known to be of type integer. | |
70 | * Returns 1 if both are identical. | |
71 | */ | |
72 | static bool match_ustctl_field_integer_from_raw_basic_type( | |
73 | const union _ustctl_basic_type *first, | |
74 | const union _ustctl_basic_type *second) | |
75 | { | |
76 | return match_ustctl_field_integer(&first->integer, &second->integer); | |
77 | } | |
78 | ||
79 | /* | |
80 | * Compare two _ustctl_basic_type fields known to be of type enum. | |
81 | * Returns 1 if both are identical. | |
82 | */ | |
83 | static bool match_ustctl_field_enum_from_raw_basic_type( | |
84 | const union _ustctl_basic_type *first, | |
85 | const union _ustctl_basic_type *second) | |
86 | { | |
87 | /* | |
88 | * Compare enumeration ID. Enumeration ID is provided to the application by | |
89 | * the session daemon before event registration. | |
90 | */ | |
91 | if (first->enumeration.id != second->enumeration.id) { | |
92 | goto no_match; | |
93 | } | |
94 | ||
95 | /* | |
96 | * Sanity check of the name and container type. Those were already checked | |
97 | * during enum registration. | |
98 | */ | |
99 | if (strncmp(first->enumeration.name, second->enumeration.name, | |
100 | LTTNG_UST_SYM_NAME_LEN)) { | |
101 | goto no_match; | |
102 | } | |
103 | if (!match_ustctl_field_integer(&first->enumeration.container_type, | |
104 | &second->enumeration.container_type)) { | |
105 | goto no_match; | |
106 | } | |
107 | ||
108 | return true; | |
109 | ||
110 | no_match: | |
111 | return false; | |
112 | } | |
113 | ||
114 | /* | |
115 | * Compare two _ustctl_basic_type fields known to be of type string. | |
116 | * Returns 1 if both are identical. | |
117 | */ | |
118 | static bool match_ustctl_field_string_from_raw_basic_type( | |
119 | const union _ustctl_basic_type *first, | |
120 | const union _ustctl_basic_type *second) | |
121 | { | |
122 | return first->string.encoding == second->string.encoding; | |
123 | } | |
124 | ||
125 | /* | |
126 | * Compare two _ustctl_basic_type fields known to be of type float. | |
127 | * Returns 1 if both are identical. | |
128 | */ | |
129 | static bool match_ustctl_field_float_from_raw_basic_type( | |
130 | const union _ustctl_basic_type *first, | |
131 | const union _ustctl_basic_type *second) | |
132 | { | |
133 | if (first->_float.exp_dig != second->_float.exp_dig) { | |
134 | goto no_match; | |
135 | } | |
136 | ||
137 | if (first->_float.mant_dig != second->_float.mant_dig) { | |
138 | goto no_match; | |
139 | } | |
140 | ||
141 | if (first->_float.reverse_byte_order != | |
142 | second->_float.reverse_byte_order) { | |
143 | goto no_match; | |
144 | } | |
145 | ||
146 | if (first->_float.alignment != second->_float.alignment) { | |
147 | goto no_match; | |
148 | } | |
149 | ||
150 | return true; | |
151 | ||
152 | no_match: | |
153 | return false; | |
154 | } | |
155 | ||
156 | /* | |
157 | * Compare two _ustctl_basic_type fields given their respective abstract types. | |
158 | * Returns 1 if both are identical. | |
159 | */ | |
160 | static bool match_ustctl_field_raw_basic_type( | |
161 | enum ustctl_abstract_types first_atype, | |
162 | const union _ustctl_basic_type *first, | |
163 | enum ustctl_abstract_types second_atype, | |
164 | const union _ustctl_basic_type *second) | |
165 | { | |
166 | if (first_atype != second_atype) { | |
167 | goto no_match; | |
168 | } | |
169 | ||
170 | switch (first_atype) { | |
171 | case ustctl_atype_integer: | |
172 | if (!match_ustctl_field_integer_from_raw_basic_type(first, second)) { | |
173 | goto no_match; | |
174 | } | |
175 | break; | |
176 | case ustctl_atype_enum: | |
177 | if (!match_ustctl_field_enum_from_raw_basic_type(first, second)) { | |
178 | goto no_match; | |
179 | } | |
180 | break; | |
181 | case ustctl_atype_string: | |
182 | if (!match_ustctl_field_string_from_raw_basic_type(first, second)) { | |
183 | goto no_match; | |
184 | } | |
185 | break; | |
186 | case ustctl_atype_float: | |
187 | if (!match_ustctl_field_float_from_raw_basic_type(first, second)) { | |
188 | goto no_match; | |
189 | } | |
190 | break; | |
191 | default: | |
192 | goto no_match; | |
193 | } | |
194 | ||
195 | return true; | |
196 | ||
197 | no_match: | |
198 | return false; | |
199 | } | |
200 | ||
201 | /* | |
202 | * Compatibility layer between the ustctl_basic_type struct and | |
203 | * _ustctl_basic_type union. | |
204 | */ | |
205 | static bool match_ustctl_field_basic_type(const struct ustctl_basic_type *first, | |
206 | const struct ustctl_basic_type *second) | |
207 | { | |
208 | return match_ustctl_field_raw_basic_type(first->atype, &first->u.basic, | |
209 | second->atype, &second->u.basic); | |
210 | } | |
211 | ||
212 | int match_ustctl_field(const struct ustctl_field *first, | |
213 | const struct ustctl_field *second) | |
214 | { | |
215 | /* Check the name of the field is identical. */ | |
216 | if (strncmp(first->name, second->name, LTTNG_UST_SYM_NAME_LEN)) { | |
217 | goto no_match; | |
218 | } | |
219 | ||
220 | /* Check the field type is identical. */ | |
221 | if (first->type.atype != second->type.atype) { | |
222 | goto no_match; | |
223 | } | |
224 | ||
225 | /* Check the field layout. */ | |
226 | switch (first->type.atype) { | |
227 | case ustctl_atype_integer: | |
228 | case ustctl_atype_enum: | |
229 | case ustctl_atype_string: | |
230 | case ustctl_atype_float: | |
231 | if (!match_ustctl_field_raw_basic_type(first->type.atype, | |
232 | &first->type.u.basic, second->type.atype, | |
233 | &second->type.u.basic)) { | |
234 | goto no_match; | |
235 | } | |
236 | break; | |
237 | case ustctl_atype_sequence: | |
238 | /* Match element type of the sequence. */ | |
239 | if (!match_ustctl_field_basic_type(&first->type.u.sequence.elem_type, | |
240 | &second->type.u.sequence.elem_type)) { | |
241 | goto no_match; | |
242 | } | |
243 | ||
244 | /* Match length type of the sequence. */ | |
245 | if (!match_ustctl_field_basic_type(&first->type.u.sequence.length_type, | |
246 | &second->type.u.sequence.length_type)) { | |
247 | goto no_match; | |
248 | } | |
249 | break; | |
250 | case ustctl_atype_array: | |
251 | /* Match element type of the array. */ | |
252 | if (!match_ustctl_field_basic_type(&first->type.u.array.elem_type, | |
253 | &second->type.u.array.elem_type)) { | |
254 | goto no_match; | |
255 | } | |
256 | ||
257 | /* Match length of the array. */ | |
258 | if (first->type.u.array.length != second->type.u.array.length) { | |
259 | goto no_match; | |
260 | } | |
261 | break; | |
262 | case ustctl_atype_variant: | |
263 | /* Compare number of choice of the variants. */ | |
264 | if (first->type.u.variant.nr_choices != | |
265 | second->type.u.variant.nr_choices) { | |
266 | goto no_match; | |
267 | } | |
268 | ||
269 | /* Compare tag name of the variants. */ | |
270 | if (strncmp(first->type.u.variant.tag_name, | |
271 | second->type.u.variant.tag_name, | |
272 | LTTNG_UST_SYM_NAME_LEN)) { | |
273 | goto no_match; | |
274 | } | |
275 | break; | |
276 | case ustctl_atype_struct: | |
277 | /* Compare number of fields of the structs. */ | |
278 | if (first->type.u._struct.nr_fields != second->type.u._struct.nr_fields) { | |
279 | goto no_match; | |
280 | } | |
281 | break; | |
282 | default: | |
283 | goto no_match; | |
284 | } | |
285 | ||
286 | return true; | |
287 | ||
288 | no_match: | |
289 | return false; | |
290 | } |