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2463b787 JR |
1 | /* |
2 | * Copyright 2020 EfficiOS, Inc. | |
3 | * | |
4 | * SPDX-License-Identifier: LGPL-2.1-only | |
5 | * | |
6 | */ | |
7 | ||
8 | #include "event-expr-to-bytecode.h" | |
9 | ||
10 | #include <stdio.h> | |
11 | #include <lttng/event-expr.h> | |
12 | #include <common/bytecode/bytecode.h> | |
13 | ||
14 | ||
15 | static | |
16 | int event_expr_to_bytecode_recursive(const struct lttng_event_expr *expr, | |
17 | struct lttng_bytecode_alloc **bytecode, | |
18 | struct lttng_bytecode_alloc **bytecode_reloc) | |
19 | { | |
20 | enum lttng_event_expr_status event_expr_status; | |
21 | int status; | |
22 | ||
23 | switch (lttng_event_expr_get_type(expr)) { | |
24 | case LTTNG_EVENT_EXPR_TYPE_EVENT_PAYLOAD_FIELD: | |
25 | { | |
26 | const char *name; | |
27 | ||
28 | status = bytecode_push_get_payload_root(bytecode); | |
29 | if (status) { | |
30 | goto end; | |
31 | } | |
32 | ||
33 | name = lttng_event_expr_event_payload_field_get_name(expr); | |
34 | if (!name) { | |
35 | status = -1; | |
36 | goto end; | |
37 | } | |
38 | ||
39 | status = bytecode_push_get_symbol(bytecode, bytecode_reloc, name); | |
40 | if (status) { | |
41 | goto end; | |
42 | } | |
43 | ||
44 | break; | |
45 | } | |
46 | ||
47 | case LTTNG_EVENT_EXPR_TYPE_CHANNEL_CONTEXT_FIELD: | |
48 | { | |
49 | const char *name; | |
50 | ||
51 | status = bytecode_push_get_context_root(bytecode); | |
52 | if (status) { | |
53 | goto end; | |
54 | } | |
55 | ||
56 | name = lttng_event_expr_channel_context_field_get_name(expr); | |
57 | if (!name) { | |
58 | status = -1; | |
59 | goto end; | |
60 | } | |
61 | ||
62 | status = bytecode_push_get_symbol(bytecode, bytecode_reloc, name); | |
63 | if (status) { | |
64 | goto end; | |
65 | } | |
66 | ||
67 | break; | |
68 | } | |
69 | ||
70 | case LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD: | |
71 | { | |
72 | const char *provider_name, *type_name; | |
73 | char *name = NULL; | |
74 | int ret; | |
75 | ||
76 | status = bytecode_push_get_app_context_root(bytecode); | |
77 | if (status) { | |
78 | goto end; | |
79 | } | |
80 | ||
81 | provider_name = lttng_event_expr_app_specific_context_field_get_provider_name(expr); | |
82 | if (!provider_name) { | |
83 | status = -1; | |
84 | goto end; | |
85 | } | |
86 | ||
87 | type_name = lttng_event_expr_app_specific_context_field_get_type_name(expr); | |
88 | if (!type_name) { | |
89 | status = -1; | |
90 | goto end; | |
91 | } | |
92 | ||
93 | /* Reconstitute the app context field name from its two parts. */ | |
94 | ret = asprintf(&name, "%s:%s", provider_name, type_name); | |
95 | if (ret < 0) { | |
96 | status = -1; | |
97 | goto end; | |
98 | } | |
99 | ||
100 | status = bytecode_push_get_symbol(bytecode, bytecode_reloc, name); | |
101 | free(name); | |
102 | if (status) { | |
103 | goto end; | |
104 | } | |
105 | ||
106 | break; | |
107 | } | |
108 | ||
109 | case LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT: | |
110 | { | |
111 | const struct lttng_event_expr *parent; | |
112 | unsigned int index; | |
113 | ||
114 | parent = lttng_event_expr_array_field_element_get_parent_expr(expr); | |
115 | if (!parent) { | |
116 | status = -1; | |
117 | goto end; | |
118 | } | |
119 | ||
120 | status = event_expr_to_bytecode_recursive(parent, bytecode, bytecode_reloc); | |
121 | if (status) { | |
122 | goto end; | |
123 | } | |
124 | ||
125 | event_expr_status = lttng_event_expr_array_field_element_get_index( | |
126 | expr, &index); | |
127 | if (event_expr_status != LTTNG_EVENT_EXPR_STATUS_OK) { | |
128 | status = -1; | |
129 | goto end; | |
130 | } | |
131 | ||
132 | status = bytecode_push_get_index_u64(bytecode, index); | |
133 | if (status) { | |
134 | goto end; | |
135 | } | |
136 | ||
137 | break; | |
138 | } | |
139 | ||
140 | default: | |
141 | abort(); | |
142 | } | |
143 | ||
144 | status = 0; | |
145 | end: | |
146 | return status; | |
147 | } | |
148 | ||
149 | LTTNG_HIDDEN | |
150 | int lttng_event_expr_to_bytecode(const struct lttng_event_expr *expr, | |
151 | struct lttng_bytecode **bytecode_out) | |
152 | { | |
153 | struct lttng_bytecode_alloc *bytecode = NULL; | |
154 | struct lttng_bytecode_alloc *bytecode_reloc = NULL; | |
155 | struct return_op ret_insn; | |
156 | int status; | |
157 | ||
158 | status = bytecode_init(&bytecode); | |
159 | if (status) { | |
160 | goto end; | |
161 | } | |
162 | ||
163 | status = bytecode_init(&bytecode_reloc); | |
164 | if (status) { | |
165 | goto end; | |
166 | } | |
167 | ||
168 | status = event_expr_to_bytecode_recursive (expr, &bytecode, &bytecode_reloc); | |
169 | if (status) { | |
170 | goto end; | |
171 | } | |
172 | ||
173 | ret_insn.op = BYTECODE_OP_RETURN; | |
174 | bytecode_push(&bytecode, &ret_insn, 1, sizeof(ret_insn)); | |
175 | ||
176 | /* Append symbol table to bytecode. */ | |
177 | bytecode->b.reloc_table_offset = bytecode_get_len(&bytecode->b); | |
178 | status = bytecode_push(&bytecode, bytecode_reloc->b.data, | |
179 | 1, bytecode_get_len(&bytecode_reloc->b)); | |
180 | if (status) { | |
181 | goto end; | |
182 | } | |
183 | ||
184 | /* Copy the `lttng_bytecode` out of the `lttng_bytecode_alloc`. */ | |
185 | *bytecode_out = bytecode_copy(&bytecode->b); | |
186 | if (!*bytecode_out) { | |
187 | status = -1; | |
188 | goto end; | |
189 | } | |
190 | ||
191 | end: | |
192 | if (bytecode) { | |
193 | free(bytecode); | |
194 | } | |
195 | ||
196 | if (bytecode_reloc) { | |
197 | free(bytecode_reloc); | |
198 | } | |
199 | ||
200 | return status; | |
201 | } |