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55aa24fb SDJ |
1 | /* Generic SDT probe support for GDB. |
2 | ||
ecd75fc8 | 3 | Copyright (C) 2012-2014 Free Software Foundation, Inc. |
55aa24fb SDJ |
4 | |
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 3 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #if !defined (PROBE_H) | |
21 | #define PROBE_H 1 | |
22 | ||
23 | #include "gdb_vecs.h" | |
24 | ||
48faced0 DE |
25 | /* Definition of a vector of probes. */ |
26 | ||
27 | typedef struct probe *probe_p; | |
28 | DEF_VEC_P (probe_p); | |
29 | ||
55aa24fb SDJ |
30 | struct linespec_result; |
31 | ||
32 | /* Structure useful for passing the header names in the method | |
33 | `gen_ui_out_table_header'. */ | |
34 | ||
35 | struct info_probe_column | |
36 | { | |
37 | /* The internal name of the field. This string cannot be capitalized nor | |
38 | localized, e.g., "extra_field". */ | |
39 | ||
40 | const char *field_name; | |
41 | ||
42 | /* The field name to be printed in the `info probes' command. This | |
43 | string can be capitalized and localized, e.g., _("Extra Field"). */ | |
44 | const char *print_name; | |
45 | }; | |
46 | ||
47 | typedef struct info_probe_column info_probe_column_s; | |
48 | DEF_VEC_O (info_probe_column_s); | |
49 | ||
50 | /* Operations associated with a probe. */ | |
51 | ||
52 | struct probe_ops | |
53 | { | |
54 | /* Method responsible for verifying if LINESPECP is a valid linespec for | |
55 | a probe breakpoint. It should return 1 if it is, or zero if it is not. | |
56 | It also should update LINESPECP in order to discard the breakpoint | |
57 | option associated with this linespec. For example, if the option is | |
58 | `-probe', and the LINESPECP is `-probe abc', the function should | |
59 | return 1 and set LINESPECP to `abc'. */ | |
60 | ||
61 | int (*is_linespec) (const char **linespecp); | |
62 | ||
63 | /* Function that should fill PROBES with known probes from OBJFILE. */ | |
64 | ||
65 | void (*get_probes) (VEC (probe_p) **probes, struct objfile *objfile); | |
66 | ||
67 | /* Function used to relocate addresses from PROBE according to some DELTA | |
68 | provided. */ | |
69 | ||
70 | void (*relocate) (struct probe *probe, CORE_ADDR delta); | |
71 | ||
72 | /* Return the number of arguments of PROBE. */ | |
73 | ||
08a6411c SDJ |
74 | unsigned (*get_probe_argument_count) (struct probe *probe, |
75 | struct frame_info *frame); | |
55aa24fb | 76 | |
25f9533e SDJ |
77 | /* Return 1 if the probe interface can evaluate the arguments of probe |
78 | PROBE, zero otherwise. See the comments on | |
79 | sym_probe_fns:can_evaluate_probe_arguments for more details. */ | |
80 | ||
81 | int (*can_evaluate_probe_arguments) (struct probe *probe); | |
82 | ||
55aa24fb SDJ |
83 | /* Evaluate the Nth argument from the PROBE, returning a value |
84 | corresponding to it. The argument number is represented N. */ | |
85 | ||
86 | struct value *(*evaluate_probe_argument) (struct probe *probe, | |
08a6411c SDJ |
87 | unsigned n, |
88 | struct frame_info *frame); | |
55aa24fb SDJ |
89 | |
90 | /* Compile the Nth argument of the PROBE to an agent expression. | |
91 | The argument number is represented by N. */ | |
92 | ||
6bac7473 | 93 | void (*compile_to_ax) (struct probe *probe, struct agent_expr *aexpr, |
55aa24fb SDJ |
94 | struct axs_value *axs_value, unsigned n); |
95 | ||
96 | /* Set the semaphore associated with the PROBE. This function only makes | |
97 | sense if the probe has a concept of semaphore associated to a | |
98 | probe. */ | |
99 | ||
100 | void (*set_semaphore) (struct probe *probe, struct gdbarch *gdbarch); | |
101 | ||
102 | /* Clear the semaphore associated with the PROBE. This function only | |
103 | makes sense if the probe has a concept of semaphore associated to | |
104 | a probe. */ | |
105 | ||
106 | void (*clear_semaphore) (struct probe *probe, struct gdbarch *gdbarch); | |
107 | ||
108 | /* Function called to destroy PROBE's specific data. This function | |
109 | shall not free PROBE itself. */ | |
110 | ||
111 | void (*destroy) (struct probe *probe); | |
112 | ||
113 | /* Function responsible for providing the extra fields that will be | |
114 | printed in the `info probes' command. It should fill HEADS | |
115 | with whatever extra fields it needs. If the backend doesn't need | |
116 | to print extra fields, it can set this method to NULL. */ | |
117 | ||
118 | void (*gen_info_probes_table_header) (VEC (info_probe_column_s) **heads); | |
119 | ||
120 | /* Function that will fill VALUES with the values of the extra fields | |
6bac7473 SDJ |
121 | to be printed for PROBE. If the backend implements the |
122 | `gen_ui_out_table_header' method, then it should implement | |
55aa24fb SDJ |
123 | this method as well. The backend should also guarantee that the |
124 | order and the number of values in the vector is exactly the same | |
125 | as the order of the extra fields provided in the method | |
126 | `gen_ui_out_table_header'. If a certain field is to be skipped | |
127 | when printing the information, you can push a NULL value in that | |
128 | position in the vector. */ | |
129 | ||
130 | void (*gen_info_probes_table_values) (struct probe *probe, | |
55aa24fb SDJ |
131 | VEC (const_char_ptr) **values); |
132 | }; | |
133 | ||
134 | /* Definition of a vector of probe_ops. */ | |
135 | ||
136 | typedef const struct probe_ops *probe_ops_cp; | |
137 | DEF_VEC_P (probe_ops_cp); | |
138 | extern VEC (probe_ops_cp) *all_probe_ops; | |
139 | ||
140 | /* The probe_ops associated with the generic probe. */ | |
141 | ||
142 | extern const struct probe_ops probe_ops_any; | |
143 | ||
144 | /* Helper function that, given KEYWORDS, iterate over it trying to match | |
145 | each keyword with LINESPECP. If it succeeds, it updates the LINESPECP | |
146 | pointer and returns 1. Otherwise, nothing is done to LINESPECP and zero | |
147 | is returned. */ | |
148 | ||
149 | extern int probe_is_linespec_by_keyword (const char **linespecp, | |
150 | const char *const *keywords); | |
151 | ||
152 | /* Return specific PROBE_OPS * matching *LINESPECP and possibly updating | |
153 | *LINESPECP to skip its "-probe-type " prefix. Return &probe_ops_any if | |
154 | *LINESPECP matches "-probe ", that is any unspecific probe. Return NULL if | |
155 | *LINESPECP is not identified as any known probe type, *LINESPECP is not | |
156 | modified in such case. */ | |
157 | ||
158 | extern const struct probe_ops *probe_linespec_to_ops (const char **linespecp); | |
159 | ||
160 | /* The probe itself. The struct contains generic information about the | |
161 | probe, and then some specific information which should be stored in | |
162 | the `probe_info' field. */ | |
163 | ||
164 | struct probe | |
165 | { | |
166 | /* The operations associated with this probe. */ | |
167 | const struct probe_ops *pops; | |
168 | ||
6bac7473 SDJ |
169 | /* The objfile which contains this probe. Even if the probe is also |
170 | present in a separate debug objfile, this variable always points to | |
171 | the non-separate debug objfile. */ | |
172 | struct objfile *objfile; | |
173 | ||
55aa24fb SDJ |
174 | /* The name of the probe. */ |
175 | const char *name; | |
176 | ||
177 | /* The provider of the probe. It generally defaults to the name of | |
178 | the objfile which contains the probe. */ | |
179 | const char *provider; | |
180 | ||
181 | /* The address where the probe is inserted. */ | |
182 | CORE_ADDR address; | |
183 | }; | |
184 | ||
185 | /* A helper for linespec that decodes a probe specification. It returns a | |
186 | symtabs_and_lines object and updates *ARGPTR or throws an error. The | |
187 | argument PTYPE specifies the type of the probe(s) to be parsed. */ | |
188 | ||
189 | extern struct symtabs_and_lines parse_probes (char **argptr, | |
190 | struct linespec_result *canon); | |
191 | ||
192 | /* Helper function to register the proper probe_ops to a newly created probe. | |
193 | This function is mainly called from `sym_get_probes'. */ | |
194 | ||
195 | extern void register_probe_ops (struct probe *probe); | |
196 | ||
197 | /* Given a PC, find an associated probe with type PTYPE. If a probe is | |
6bac7473 | 198 | found, return it. If no probe is found, return NULL. */ |
55aa24fb | 199 | |
6bac7473 | 200 | extern struct probe *find_probe_by_pc (CORE_ADDR pc); |
55aa24fb SDJ |
201 | |
202 | /* Search OBJFILE for a probe with the given PROVIDER, NAME and PTYPE. | |
203 | Return a VEC of all probes that were found. If no matching probe | |
204 | is found, return NULL. The caller must free the VEC. */ | |
205 | ||
206 | extern VEC (probe_p) *find_probes_in_objfile (struct objfile *objfile, | |
207 | const char *provider, | |
208 | const char *name); | |
209 | ||
210 | /* Generate a `info probes' command output for probe_ops represented by | |
211 | POPS. If POPS is NULL it considers any probes types. It is a helper | |
212 | function that can be used by the probe backends to print their | |
213 | `info probe TYPE'. */ | |
214 | ||
215 | extern void info_probes_for_ops (char *arg, int from_tty, | |
216 | const struct probe_ops *pops); | |
217 | ||
218 | /* Return the `cmd_list_element' associated with the `info probes' command, | |
219 | or create a new one if it doesn't exist. Helper function that serves the | |
220 | purpose of avoiding the case of a backend using the `cmd_list_element' | |
221 | associated with `info probes', without having it registered yet. */ | |
222 | ||
223 | extern struct cmd_list_element **info_probes_cmdlist_get (void); | |
224 | ||
9ee6a5ac GB |
225 | /* Return the argument count of the specified probe. */ |
226 | ||
08a6411c SDJ |
227 | extern unsigned get_probe_argument_count (struct probe *probe, |
228 | struct frame_info *frame); | |
9ee6a5ac | 229 | |
25f9533e SDJ |
230 | /* Return 1 if the probe interface associated with PROBE can evaluate |
231 | arguments, zero otherwise. See the comments on the definition of | |
232 | sym_probe_fns:can_evaluate_probe_arguments for more details. */ | |
233 | ||
234 | extern int can_evaluate_probe_arguments (struct probe *probe); | |
235 | ||
9ee6a5ac GB |
236 | /* Evaluate argument N of the specified probe. N must be between 0 |
237 | inclusive and get_probe_argument_count exclusive. */ | |
238 | ||
239 | extern struct value *evaluate_probe_argument (struct probe *probe, | |
08a6411c SDJ |
240 | unsigned n, |
241 | struct frame_info *frame); | |
9ee6a5ac | 242 | |
55aa24fb SDJ |
243 | /* A convenience function that finds a probe at the PC in FRAME and |
244 | evaluates argument N, with 0 <= N < number_of_args. If there is no | |
245 | probe at that location, or if the probe does not have enough arguments, | |
246 | this returns NULL. */ | |
247 | ||
248 | extern struct value *probe_safe_evaluate_at_pc (struct frame_info *frame, | |
249 | unsigned n); | |
250 | ||
251 | #endif /* !defined (PROBE_H) */ |