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55aa24fb SDJ |
1 | /* Generic SDT probe support for GDB. |
2 | ||
32d0add0 | 3 | Copyright (C) 2012-2015 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 | ||
729662a5 TT |
67 | /* Compute the probe's relocated address. OBJFILE is the objfile |
68 | in which the probe originated. */ | |
55aa24fb | 69 | |
729662a5 TT |
70 | CORE_ADDR (*get_probe_address) (struct probe *probe, |
71 | struct objfile *objfile); | |
55aa24fb SDJ |
72 | |
73 | /* Return the number of arguments of PROBE. */ | |
74 | ||
08a6411c SDJ |
75 | unsigned (*get_probe_argument_count) (struct probe *probe, |
76 | struct frame_info *frame); | |
55aa24fb | 77 | |
25f9533e SDJ |
78 | /* Return 1 if the probe interface can evaluate the arguments of probe |
79 | PROBE, zero otherwise. See the comments on | |
80 | sym_probe_fns:can_evaluate_probe_arguments for more details. */ | |
81 | ||
82 | int (*can_evaluate_probe_arguments) (struct probe *probe); | |
83 | ||
55aa24fb SDJ |
84 | /* Evaluate the Nth argument from the PROBE, returning a value |
85 | corresponding to it. The argument number is represented N. */ | |
86 | ||
87 | struct value *(*evaluate_probe_argument) (struct probe *probe, | |
08a6411c SDJ |
88 | unsigned n, |
89 | struct frame_info *frame); | |
55aa24fb SDJ |
90 | |
91 | /* Compile the Nth argument of the PROBE to an agent expression. | |
92 | The argument number is represented by N. */ | |
93 | ||
6bac7473 | 94 | void (*compile_to_ax) (struct probe *probe, struct agent_expr *aexpr, |
55aa24fb SDJ |
95 | struct axs_value *axs_value, unsigned n); |
96 | ||
97 | /* Set the semaphore associated with the PROBE. This function only makes | |
98 | sense if the probe has a concept of semaphore associated to a | |
0ea5cda8 | 99 | probe, otherwise it can be set to NULL. */ |
55aa24fb | 100 | |
729662a5 TT |
101 | void (*set_semaphore) (struct probe *probe, struct objfile *objfile, |
102 | struct gdbarch *gdbarch); | |
55aa24fb SDJ |
103 | |
104 | /* Clear the semaphore associated with the PROBE. This function only | |
105 | makes sense if the probe has a concept of semaphore associated to | |
0ea5cda8 | 106 | a probe, otherwise it can be set to NULL. */ |
55aa24fb | 107 | |
729662a5 TT |
108 | void (*clear_semaphore) (struct probe *probe, struct objfile *objfile, |
109 | struct gdbarch *gdbarch); | |
55aa24fb SDJ |
110 | |
111 | /* Function called to destroy PROBE's specific data. This function | |
112 | shall not free PROBE itself. */ | |
113 | ||
114 | void (*destroy) (struct probe *probe); | |
115 | ||
116 | /* Function responsible for providing the extra fields that will be | |
117 | printed in the `info probes' command. It should fill HEADS | |
118 | with whatever extra fields it needs. If the backend doesn't need | |
119 | to print extra fields, it can set this method to NULL. */ | |
120 | ||
121 | void (*gen_info_probes_table_header) (VEC (info_probe_column_s) **heads); | |
122 | ||
123 | /* Function that will fill VALUES with the values of the extra fields | |
6bac7473 SDJ |
124 | to be printed for PROBE. If the backend implements the |
125 | `gen_ui_out_table_header' method, then it should implement | |
55aa24fb SDJ |
126 | this method as well. The backend should also guarantee that the |
127 | order and the number of values in the vector is exactly the same | |
128 | as the order of the extra fields provided in the method | |
129 | `gen_ui_out_table_header'. If a certain field is to be skipped | |
130 | when printing the information, you can push a NULL value in that | |
131 | position in the vector. */ | |
132 | ||
133 | void (*gen_info_probes_table_values) (struct probe *probe, | |
55aa24fb SDJ |
134 | VEC (const_char_ptr) **values); |
135 | }; | |
136 | ||
137 | /* Definition of a vector of probe_ops. */ | |
138 | ||
139 | typedef const struct probe_ops *probe_ops_cp; | |
140 | DEF_VEC_P (probe_ops_cp); | |
141 | extern VEC (probe_ops_cp) *all_probe_ops; | |
142 | ||
143 | /* The probe_ops associated with the generic probe. */ | |
144 | ||
145 | extern const struct probe_ops probe_ops_any; | |
146 | ||
147 | /* Helper function that, given KEYWORDS, iterate over it trying to match | |
148 | each keyword with LINESPECP. If it succeeds, it updates the LINESPECP | |
149 | pointer and returns 1. Otherwise, nothing is done to LINESPECP and zero | |
150 | is returned. */ | |
151 | ||
152 | extern int probe_is_linespec_by_keyword (const char **linespecp, | |
153 | const char *const *keywords); | |
154 | ||
155 | /* Return specific PROBE_OPS * matching *LINESPECP and possibly updating | |
156 | *LINESPECP to skip its "-probe-type " prefix. Return &probe_ops_any if | |
157 | *LINESPECP matches "-probe ", that is any unspecific probe. Return NULL if | |
158 | *LINESPECP is not identified as any known probe type, *LINESPECP is not | |
159 | modified in such case. */ | |
160 | ||
161 | extern const struct probe_ops *probe_linespec_to_ops (const char **linespecp); | |
162 | ||
163 | /* The probe itself. The struct contains generic information about the | |
164 | probe, and then some specific information which should be stored in | |
165 | the `probe_info' field. */ | |
166 | ||
167 | struct probe | |
168 | { | |
169 | /* The operations associated with this probe. */ | |
170 | const struct probe_ops *pops; | |
171 | ||
729662a5 TT |
172 | /* The probe's architecture. */ |
173 | struct gdbarch *arch; | |
6bac7473 | 174 | |
55aa24fb SDJ |
175 | /* The name of the probe. */ |
176 | const char *name; | |
177 | ||
178 | /* The provider of the probe. It generally defaults to the name of | |
179 | the objfile which contains the probe. */ | |
180 | const char *provider; | |
181 | ||
729662a5 TT |
182 | /* The address where the probe is inserted, relative to |
183 | SECT_OFF_TEXT. */ | |
55aa24fb SDJ |
184 | CORE_ADDR address; |
185 | }; | |
186 | ||
729662a5 TT |
187 | /* A bound probe holds a pointer to a probe and a pointer to the |
188 | probe's defining objfile. This is needed because probes are | |
189 | independent of the program space and thus require relocation at | |
190 | their point of use. */ | |
191 | ||
192 | struct bound_probe | |
193 | { | |
194 | /* The probe. */ | |
195 | ||
196 | struct probe *probe; | |
197 | ||
198 | /* The objfile in which the probe originated. */ | |
199 | ||
200 | struct objfile *objfile; | |
201 | }; | |
202 | ||
55aa24fb | 203 | /* A helper for linespec that decodes a probe specification. It returns a |
ff887920 | 204 | symtabs_and_lines object and updates *ARGPTR or throws an error. */ |
55aa24fb SDJ |
205 | |
206 | extern struct symtabs_and_lines parse_probes (char **argptr, | |
207 | struct linespec_result *canon); | |
208 | ||
209 | /* Helper function to register the proper probe_ops to a newly created probe. | |
210 | This function is mainly called from `sym_get_probes'. */ | |
211 | ||
212 | extern void register_probe_ops (struct probe *probe); | |
213 | ||
ff887920 | 214 | /* Given a PC, find an associated probe. If a probe is found, return |
729662a5 TT |
215 | it. If no probe is found, return a bound probe whose fields are |
216 | both NULL. */ | |
55aa24fb | 217 | |
729662a5 | 218 | extern struct bound_probe find_probe_by_pc (CORE_ADDR pc); |
55aa24fb | 219 | |
ff887920 TT |
220 | /* Search OBJFILE for a probe with the given PROVIDER, NAME. Return a |
221 | VEC of all probes that were found. If no matching probe is found, | |
222 | return NULL. The caller must free the VEC. */ | |
55aa24fb SDJ |
223 | |
224 | extern VEC (probe_p) *find_probes_in_objfile (struct objfile *objfile, | |
225 | const char *provider, | |
226 | const char *name); | |
227 | ||
228 | /* Generate a `info probes' command output for probe_ops represented by | |
229 | POPS. If POPS is NULL it considers any probes types. It is a helper | |
230 | function that can be used by the probe backends to print their | |
231 | `info probe TYPE'. */ | |
232 | ||
8236def8 | 233 | extern void info_probes_for_ops (const char *arg, int from_tty, |
55aa24fb SDJ |
234 | const struct probe_ops *pops); |
235 | ||
236 | /* Return the `cmd_list_element' associated with the `info probes' command, | |
237 | or create a new one if it doesn't exist. Helper function that serves the | |
238 | purpose of avoiding the case of a backend using the `cmd_list_element' | |
239 | associated with `info probes', without having it registered yet. */ | |
240 | ||
241 | extern struct cmd_list_element **info_probes_cmdlist_get (void); | |
242 | ||
729662a5 TT |
243 | /* Compute the probe's relocated address. OBJFILE is the objfile in |
244 | which the probe originated. */ | |
245 | ||
246 | extern CORE_ADDR get_probe_address (struct probe *probe, | |
247 | struct objfile *objfile); | |
248 | ||
9ee6a5ac GB |
249 | /* Return the argument count of the specified probe. */ |
250 | ||
08a6411c SDJ |
251 | extern unsigned get_probe_argument_count (struct probe *probe, |
252 | struct frame_info *frame); | |
9ee6a5ac | 253 | |
25f9533e SDJ |
254 | /* Return 1 if the probe interface associated with PROBE can evaluate |
255 | arguments, zero otherwise. See the comments on the definition of | |
256 | sym_probe_fns:can_evaluate_probe_arguments for more details. */ | |
257 | ||
258 | extern int can_evaluate_probe_arguments (struct probe *probe); | |
259 | ||
9ee6a5ac GB |
260 | /* Evaluate argument N of the specified probe. N must be between 0 |
261 | inclusive and get_probe_argument_count exclusive. */ | |
262 | ||
263 | extern struct value *evaluate_probe_argument (struct probe *probe, | |
08a6411c SDJ |
264 | unsigned n, |
265 | struct frame_info *frame); | |
9ee6a5ac | 266 | |
55aa24fb SDJ |
267 | /* A convenience function that finds a probe at the PC in FRAME and |
268 | evaluates argument N, with 0 <= N < number_of_args. If there is no | |
269 | probe at that location, or if the probe does not have enough arguments, | |
270 | this returns NULL. */ | |
271 | ||
272 | extern struct value *probe_safe_evaluate_at_pc (struct frame_info *frame, | |
273 | unsigned n); | |
274 | ||
275 | #endif /* !defined (PROBE_H) */ |