gdb/observable.h

   1 /* Observers
   2
   3    Copyright (C) 2016-2023 Free Software Foundation, Inc.
   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 #ifndef OBSERVABLE_H
  21 #define OBSERVABLE_H
  22
  23 #include "gdbsupport/observable.h"
  24 #include "target/waitstatus.h"
  25
  26 struct bpstat;
  27 struct shobj;
  28 struct objfile;
  29 struct thread_info;
  30 struct inferior;
  31 struct process_stratum_target;
  32 struct target_ops;
  33 struct trace_state_variable;
  34 struct program_space;
  35
  36 namespace gdb
  37 {
  38
  39 namespace observers
  40 {
  41
  42 /* The inferior has stopped for real.  The BS argument describes the
  43    breakpoints were are stopped at, if any.  Second argument
  44    PRINT_FRAME non-zero means display the location where the
  45    inferior has stopped.
  46
  47    gdb notifies all normal_stop observers when the inferior execution
  48    has just stopped, the associated messages and annotations have been
  49    printed, and the control is about to be returned to the user.
  50
  51    Note that the normal_stop notification is not emitted when the
  52    execution stops due to a breakpoint, and this breakpoint has a
  53    condition that is not met.  If the breakpoint has any associated
  54    commands list, the commands are executed after the notification is
  55    emitted.  */
  56 extern observable<struct bpstat */* bs */, int /* print_frame */> normal_stop;
  57
  58 /* The inferior was stopped by a signal.  */
  59 extern observable<enum gdb_signal /* siggnal */> signal_received;
  60
  61 /* The target's register contents have changed.  */
  62 extern observable<struct target_ops */* target */> target_changed;
  63
  64 /* The executable being debugged by GDB in PSPACE has changed: The user
  65    decided to debug a different program, or the program he was debugging
  66    has been modified since being loaded by the debugger (by being
  67    recompiled, for instance).  The path to the new executable can be found
  68    by examining PSPACE->exec_filename.
  69
  70    When RELOAD is true the path to the executable hasn't changed, but the
  71    file does appear to have changed, so GDB reloaded it, e.g. if the user
  72    recompiled the executable.  when RELOAD is false then the path to the
  73    executable has not changed.  */
  74 extern observable<struct program_space */* pspace */,
  75                   bool /*reload */> executable_changed;
  76
  77 /* gdb has just connected to an inferior.  For 'run', gdb calls this
  78    observer while the inferior is still stopped at the entry-point
  79    instruction.  For 'attach' and 'core', gdb calls this observer
  80    immediately after connecting to the inferior, and before any
  81    information on the inferior has been printed.  */
  82 extern observable<inferior */* inferior */> inferior_created;
  83
  84 /* The inferior EXEC_INF has exec'ed a new executable file.
  85
  86    Execution continues in FOLLOW_INF, which may or may not be the same as
  87    EXEC_INF, depending on "set follow-exec-mode".  */
  88 extern observable<inferior */* exec_inf */, inferior */* follow_inf */>
  89     inferior_execd;
  90
  91 /* The inferior PARENT_INF has forked.  If we are setting up an inferior for
  92    the child (because we follow only the child or we follow both), CHILD_INF
  93    is the child inferior.  Otherwise, CHILD_INF is nullptr.
  94
  95    FORK_KIND is TARGET_WAITKIND_FORKED or TARGET_WAITKIND_VFORKED.  */
  96 extern observable<inferior */* parent_inf */, inferior */* child_inf */,
  97                   target_waitkind /* fork_kind */> inferior_forked;
  98
  99 /* The shared library specified by SOLIB has been loaded.  Note that
 100    when gdb calls this observer, the library's symbols probably
 101    haven't been loaded yet.  */
 102 extern observable<shobj &/* solib */> solib_loaded;
 103
 104 /* The shared library SOLIB has been unloaded from program space PSPACE.
 105    Note  when gdb calls this observer, the library's symbols have not
 106    been unloaded yet, and thus are still available.  */
 107 extern observable<program_space *, const shobj &/* solib */> solib_unloaded;
 108
 109 /* The symbol file specified by OBJFILE has been loaded.  */
 110 extern observable<struct objfile */* objfile */> new_objfile;
 111
 112 /*  All objfiles from PSPACE were removed.  */
 113 extern observable<program_space */* pspace */> all_objfiles_removed;
 114
 115 /* The object file specified by OBJFILE is about to be freed.  */
 116 extern observable<struct objfile */* objfile */> free_objfile;
 117
 118 /* The thread specified by T has been created.  */
 119 extern observable<struct thread_info */* t */> new_thread;
 120
 121 /* The thread specified by T has exited.  EXIT_CODE is the thread's
 122    exit code, if available.  The SILENT argument indicates that GDB is
 123    removing the thread from its tables without wanting to notify the
 124    CLI about it.  */
 125 extern observable<thread_info */* t */,
 126                   std::optional<ULONGEST> /* exit_code */,
 127                   bool /* silent */> thread_exit;
 128
 129 /* An explicit stop request was issued to PTID.  If PTID equals
 130    minus_one_ptid, the request applied to all threads.  If
 131    ptid_is_pid(PTID) returns true, the request applied to all
 132    threads of the process pointed at by PTID.  Otherwise, the
 133    request applied to the single thread pointed at by PTID.  */
 134 extern observable<ptid_t /* ptid */> thread_stop_requested;
 135
 136 /* The target was resumed.  The PTID parameter specifies which
 137    thread was resume, and may be RESUME_ALL if all threads are
 138    resumed.  */
 139 extern observable<ptid_t /* ptid */> target_resumed;
 140
 141 /* The target is about to be proceeded.  */
 142 extern observable<> about_to_proceed;
 143
 144 /* A new breakpoint B has been created.  */
 145 extern observable<struct breakpoint */* b */> breakpoint_created;
 146
 147 /* A breakpoint has been destroyed.  The argument B is the
 148    pointer to the destroyed breakpoint.  */
 149 extern observable<struct breakpoint */* b */> breakpoint_deleted;
 150
 151 /* A breakpoint has been modified in some way.  The argument B
 152    is the modified breakpoint.  */
 153 extern observable<struct breakpoint */* b */> breakpoint_modified;
 154
 155 /* GDB has instantiated a new architecture, NEWARCH is a pointer to the new
 156    architecture.  */
 157 extern observable<struct gdbarch */* newarch */> new_architecture;
 158
 159 /* The thread's ptid has changed.  The OLD_PTID parameter specifies
 160    the old value, and NEW_PTID specifies the new value.  */
 161 extern observable<process_stratum_target * /* target */,
 162                   ptid_t /* old_ptid */, ptid_t /* new_ptid */>
 163   thread_ptid_changed;
 164
 165 /* The inferior INF has been added to the list of inferiors.  At
 166    this point, it might not be associated with any process.  */
 167 extern observable<struct inferior */* inf */> inferior_added;
 168
 169 /* The inferior identified by INF has been attached to a
 170    process.  */
 171 extern observable<struct inferior */* inf */> inferior_appeared;
 172
 173 /* Inferior INF is about to be detached.  */
 174 extern observable<struct inferior */* inf */> inferior_pre_detach;
 175
 176 /* Either the inferior associated with INF has been detached from
 177    the process, or the process has exited.  */
 178 extern observable<struct inferior */* inf */> inferior_exit;
 179
 180 /* The inferior INF has been removed from the list of inferiors.
 181    This method is called immediately before freeing INF.  */
 182 extern observable<struct inferior */* inf */> inferior_removed;
 183
 184 /* The inferior CLONE has been created by cloning INF.  */
 185 extern observable<struct inferior */* inf */, struct inferior */* clone */>
 186     inferior_cloned;
 187
 188 /* Bytes from DATA to DATA + LEN have been written to the inferior
 189    at ADDR.  */
 190 extern observable<struct inferior */* inferior */, CORE_ADDR /* addr */,
 191                   ssize_t /* len */, const bfd_byte */* data */>
 192     memory_changed;
 193
 194 /* Called before a top-level prompt is displayed.  CURRENT_PROMPT is
 195    the current top-level prompt.  */
 196 extern observable<const char */* current_prompt */> before_prompt;
 197
 198 /* Variable gdb_datadir has been set.  The value may not necessarily
 199    change.  */
 200 extern observable<> gdb_datadir_changed;
 201
 202 /* An inferior function at ADDRESS is about to be called in thread
 203    THREAD.  */
 204 extern observable<ptid_t /* thread */, CORE_ADDR /* address */>
 205     inferior_call_pre;
 206
 207 /* The inferior function at ADDRESS has just been called.  This
 208    observer is called even if the inferior exits during the call.
 209    THREAD is the thread in which the function was called, which may
 210    be different from the current thread.  */
 211 extern observable<ptid_t /* thread */, CORE_ADDR /* address */>
 212     inferior_call_post;
 213
 214 /* A register in the inferior has been modified by the gdb user.  */
 215 extern observable<frame_info_ptr /* frame */, int /* regnum */>
 216     register_changed;
 217
 218 /* The user-selected inferior, thread and/or frame has changed.  The
 219    user_select_what flag specifies if the inferior, thread and/or
 220    frame has changed.  */
 221 extern observable<user_selected_what /* selection */>
 222     user_selected_context_changed;
 223
 224 /* This is notified when a styling setting has changed, content may need
 225    to be updated based on the new settings.  */
 226 extern observable<> styling_changed;
 227
 228 /* The CLI's notion of the current source has changed.  This differs
 229    from user_selected_context_changed in that it is also set by the
 230    "list" command.  */
 231 extern observable<> current_source_symtab_and_line_changed;
 232
 233 /* Called when GDB is about to exit.  */
 234 extern observable<int> gdb_exiting;
 235
 236 /* When a connection is removed.  */
 237 extern observable<process_stratum_target */* target */> connection_removed;
 238
 239 /* About to enter target_wait (). */
 240 extern observable <ptid_t /* ptid */> target_pre_wait;
 241
 242 /* About to leave target_wait (). */
 243 extern observable <ptid_t /* event_ptid */> target_post_wait;
 244
 245 /* New program space PSPACE was created.  */
 246 extern observable <program_space */* pspace */> new_program_space;
 247
 248 /* The program space PSPACE is about to be deleted.  */
 249 extern observable <program_space */* pspace */> free_program_space;
 250
 251 } /* namespace observers */
 252
 253 } /* namespace gdb */
 254
 255 #endif /* OBSERVABLE_H */