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623b6bdf | 1 | /* Multi-thread control defs for remote server for GDB. |
213516ef | 2 | Copyright (C) 1993-2023 Free Software Foundation, Inc. |
623b6bdf YQ |
3 | |
4 | This file is part of GDB. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 3 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
18 | ||
1a5c2598 TT |
19 | #ifndef GDBSERVER_GDBTHREAD_H |
20 | #define GDBSERVER_GDBTHREAD_H | |
623b6bdf | 21 | |
268a13a5 | 22 | #include "gdbsupport/common-gdbthread.h" |
6a6bbd9d | 23 | #include "inferiors.h" |
623b6bdf | 24 | |
9c80ecd6 SM |
25 | #include <list> |
26 | ||
9accd112 | 27 | struct btrace_target_info; |
a44892be | 28 | struct regcache; |
9accd112 | 29 | |
623b6bdf YQ |
30 | struct thread_info |
31 | { | |
d2f325df SM |
32 | thread_info (ptid_t id, void *target_data) |
33 | : id (id), target_data (target_data) | |
183be222 | 34 | {} |
d2f325df SM |
35 | |
36 | ~thread_info () | |
37 | { | |
38 | free_register_cache (this->regcache_data); | |
39 | } | |
40 | ||
9c80ecd6 SM |
41 | /* The id of this thread. */ |
42 | ptid_t id; | |
80894984 | 43 | |
623b6bdf | 44 | void *target_data; |
d2f325df | 45 | struct regcache *regcache_data = nullptr; |
623b6bdf YQ |
46 | |
47 | /* The last resume GDB requested on this thread. */ | |
d2f325df | 48 | enum resume_kind last_resume_kind = resume_continue; |
623b6bdf YQ |
49 | |
50 | /* The last wait status reported for this thread. */ | |
51 | struct target_waitstatus last_status; | |
52 | ||
b7ea362b | 53 | /* True if LAST_STATUS hasn't been reported to GDB yet. */ |
d2f325df | 54 | int status_pending_p = 0; |
b7ea362b | 55 | |
623b6bdf YQ |
56 | /* Given `while-stepping', a thread may be collecting data for more |
57 | than one tracepoint simultaneously. E.g.: | |
58 | ||
59 | ff0001 INSN1 <-- TP1, while-stepping 10 collect $regs | |
60 | ff0002 INSN2 | |
61 | ff0003 INSN3 <-- TP2, collect $regs | |
62 | ff0004 INSN4 <-- TP3, while-stepping 10 collect $regs | |
63 | ff0005 INSN5 | |
64 | ||
65 | Notice that when instruction INSN5 is reached, the while-stepping | |
66 | actions of both TP1 and TP3 are still being collected, and that TP2 | |
67 | had been collected meanwhile. The whole range of ff0001-ff0005 | |
68 | should be single-stepped, due to at least TP1's while-stepping | |
69 | action covering the whole range. | |
70 | ||
71 | On the other hand, the same tracepoint with a while-stepping action | |
72 | may be hit by more than one thread simultaneously, hence we can't | |
73 | keep the current step count in the tracepoint itself. | |
74 | ||
75 | This is the head of the list of the states of `while-stepping' | |
76 | tracepoint actions this thread is now collecting; NULL if empty. | |
77 | Each item in the list holds the current step of the while-stepping | |
78 | action. */ | |
d2f325df | 79 | struct wstep_state *while_stepping = nullptr; |
9accd112 MM |
80 | |
81 | /* Branch trace target information for this thread. */ | |
d2f325df | 82 | struct btrace_target_info *btrace = nullptr; |
623b6bdf YQ |
83 | }; |
84 | ||
9c80ecd6 | 85 | extern std::list<thread_info *> all_threads; |
623b6bdf YQ |
86 | |
87 | void remove_thread (struct thread_info *thread); | |
f7667f0d | 88 | struct thread_info *add_thread (ptid_t ptid, void *target_data); |
623b6bdf | 89 | |
9c80ecd6 SM |
90 | /* Return a pointer to the first thread, or NULL if there isn't one. */ |
91 | ||
649ebbca DE |
92 | struct thread_info *get_first_thread (void); |
93 | ||
623b6bdf | 94 | struct thread_info *find_thread_ptid (ptid_t ptid); |
623b6bdf | 95 | |
34c65914 PA |
96 | /* Find any thread of the PID process. Returns NULL if none is |
97 | found. */ | |
98 | struct thread_info *find_any_thread_of_pid (int pid); | |
99 | ||
9c80ecd6 SM |
100 | /* Find the first thread for which FUNC returns true. Return NULL if no thread |
101 | satisfying FUNC is found. */ | |
102 | ||
103 | template <typename Func> | |
104 | static thread_info * | |
105 | find_thread (Func func) | |
106 | { | |
107 | std::list<thread_info *>::iterator next, cur = all_threads.begin (); | |
108 | ||
109 | while (cur != all_threads.end ()) | |
110 | { | |
111 | next = cur; | |
112 | next++; | |
113 | ||
114 | if (func (*cur)) | |
115 | return *cur; | |
116 | ||
117 | cur = next; | |
118 | } | |
119 | ||
120 | return NULL; | |
121 | } | |
122 | ||
4d3bb80e SM |
123 | /* Like the above, but only consider threads with pid PID. */ |
124 | ||
125 | template <typename Func> | |
126 | static thread_info * | |
127 | find_thread (int pid, Func func) | |
128 | { | |
129 | return find_thread ([&] (thread_info *thread) | |
130 | { | |
131 | return thread->id.pid () == pid && func (thread); | |
132 | }); | |
133 | } | |
134 | ||
6d1e5673 SM |
135 | /* Find the first thread that matches FILTER for which FUNC returns true. |
136 | Return NULL if no thread satisfying these conditions is found. */ | |
137 | ||
138 | template <typename Func> | |
139 | static thread_info * | |
140 | find_thread (ptid_t filter, Func func) | |
141 | { | |
142 | return find_thread ([&] (thread_info *thread) { | |
143 | return thread->id.matches (filter) && func (thread); | |
144 | }); | |
145 | } | |
146 | ||
9c80ecd6 SM |
147 | /* Invoke FUNC for each thread. */ |
148 | ||
149 | template <typename Func> | |
150 | static void | |
151 | for_each_thread (Func func) | |
152 | { | |
153 | std::list<thread_info *>::iterator next, cur = all_threads.begin (); | |
154 | ||
155 | while (cur != all_threads.end ()) | |
156 | { | |
157 | next = cur; | |
158 | next++; | |
159 | func (*cur); | |
160 | cur = next; | |
161 | } | |
162 | } | |
163 | ||
4d3bb80e SM |
164 | /* Like the above, but only consider threads with pid PID. */ |
165 | ||
166 | template <typename Func> | |
167 | static void | |
168 | for_each_thread (int pid, Func func) | |
169 | { | |
170 | for_each_thread ([&] (thread_info *thread) | |
171 | { | |
172 | if (pid == thread->id.pid ()) | |
173 | func (thread); | |
174 | }); | |
175 | } | |
176 | ||
9c80ecd6 SM |
177 | /* Find the a random thread for which FUNC (THREAD) returns true. If |
178 | no entry is found then return NULL. */ | |
179 | ||
180 | template <typename Func> | |
181 | static thread_info * | |
182 | find_thread_in_random (Func func) | |
183 | { | |
184 | int count = 0; | |
185 | int random_selector; | |
186 | ||
187 | /* First count how many interesting entries we have. */ | |
188 | for_each_thread ([&] (thread_info *thread) { | |
189 | if (func (thread)) | |
190 | count++; | |
191 | }); | |
192 | ||
193 | if (count == 0) | |
194 | return NULL; | |
195 | ||
196 | /* Now randomly pick an entry out of those. */ | |
197 | random_selector = (int) | |
198 | ((count * (double) rand ()) / (RAND_MAX + 1.0)); | |
199 | ||
da4ae14a TT |
200 | thread_info *thread = find_thread ([&] (thread_info *thr_arg) { |
201 | return func (thr_arg) && (random_selector-- == 0); | |
9c80ecd6 SM |
202 | }); |
203 | ||
204 | gdb_assert (thread != NULL); | |
205 | ||
206 | return thread; | |
207 | } | |
208 | ||
fbd5db48 | 209 | /* Get current thread ID (Linux task ID). */ |
9c80ecd6 | 210 | #define current_ptid (current_thread->id) |
f5a02773 | 211 | |
9179355e SM |
212 | /* Get the ptid of THREAD. */ |
213 | ||
214 | static inline ptid_t | |
215 | ptid_of (const thread_info *thread) | |
216 | { | |
9c80ecd6 | 217 | return thread->id; |
9179355e SM |
218 | } |
219 | ||
220 | /* Get the pid of THREAD. */ | |
221 | ||
222 | static inline int | |
223 | pid_of (const thread_info *thread) | |
224 | { | |
9c80ecd6 | 225 | return thread->id.pid (); |
9179355e SM |
226 | } |
227 | ||
228 | /* Get the lwp of THREAD. */ | |
229 | ||
230 | static inline long | |
231 | lwpid_of (const thread_info *thread) | |
232 | { | |
9c80ecd6 | 233 | return thread->id.lwp (); |
9179355e SM |
234 | } |
235 | ||
f24791b7 TBA |
236 | /* Switch the current thread. */ |
237 | ||
238 | void switch_to_thread (thread_info *thread); | |
239 | ||
240 | /* Save/restore current thread. */ | |
241 | ||
242 | class scoped_restore_current_thread | |
243 | { | |
244 | public: | |
245 | scoped_restore_current_thread (); | |
246 | ~scoped_restore_current_thread (); | |
247 | ||
248 | DISABLE_COPY_AND_ASSIGN (scoped_restore_current_thread); | |
249 | ||
250 | /* Cancel restoring on scope exit. */ | |
251 | void dont_restore () { m_dont_restore = true; } | |
252 | ||
253 | private: | |
254 | bool m_dont_restore = false; | |
7f8acede | 255 | process_info *m_process; |
f24791b7 TBA |
256 | thread_info *m_thread; |
257 | }; | |
258 | ||
1a5c2598 | 259 | #endif /* GDBSERVER_GDBTHREAD_H */ |