gdb/observable.h

   1 /* Observers
   2
   3    Copyright (C) 2016-2019 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
  25 struct bpstats;
  26 struct so_list;
  27 struct objfile;
  28 struct thread_info;
  29 struct inferior;
  30 struct trace_state_variable;
  31
  32 namespace gdb
  33 {
  34
  35 namespace observers
  36 {
  37
  38 /* The inferior has stopped for real.  The BS argument describes the
  39    breakpoints were are stopped at, if any.  Second argument
  40    PRINT_FRAME non-zero means display the location where the
  41    inferior has stopped.
  42
  43    gdb notifies all normal_stop observers when the inferior execution
  44    has just stopped, the associated messages and annotations have been
  45    printed, and the control is about to be returned to the user.
  46
  47    Note that the normal_stop notification is not emitted when the
  48    execution stops due to a breakpoint, and this breakpoint has a
  49    condition that is not met.  If the breakpoint has any associated
  50    commands list, the commands are executed after the notification is
  51    emitted.  */
  52 extern observable<struct bpstats */* bs */, int /* print_frame */> normal_stop;
  53
  54 /* The inferior was stopped by a signal.  */
  55 extern observable<enum gdb_signal /* siggnal */> signal_received;
  56
  57 /* We are done with a step/next/si/ni command.  */
  58 extern observable<> end_stepping_range;
  59
  60 /* The inferior was terminated by a signal.  */
  61 extern observable<enum gdb_signal /* siggnal */> signal_exited;
  62
  63 /* The inferior program is finished.  */
  64 extern observable<int /* exitstatus */> exited;
  65
  66 /* Reverse execution: target ran out of history info.  */
  67 extern observable<> no_history;
  68
  69 /* A synchronous command finished.  */
  70 extern observable<> sync_execution_done;
  71
  72 /* An error was caught while executing a command.  */
  73 extern observable<> command_error;
  74
  75 /* The target's register contents have changed.  */
  76 extern observable<struct target_ops */* target */> target_changed;
  77
  78 /* The executable being debugged by GDB has changed: The user
  79    decided to debug a different program, or the program he was
  80    debugging has been modified since being loaded by the debugger
  81    (by being recompiled, for instance).  */
  82 extern observable<> executable_changed;
  83
  84 /* gdb has just connected to an inferior.  For 'run', gdb calls this
  85    observer while the inferior is still stopped at the entry-point
  86    instruction.  For 'attach' and 'core', gdb calls this observer
  87    immediately after connecting to the inferior, and before any
  88    information on the inferior has been printed.  */
  89 extern observable<struct target_ops */* target */,
  90                   int /* from_tty */> inferior_created;
  91
  92 /* The status of process record for inferior inferior in gdb has
  93    changed.  The process record is started if STARTED is true, and
  94    the process record is stopped if STARTED is false.
  95
  96    When STARTED is true, METHOD indicates the short name of the
  97    method used for recording.  If the method supports multiple
  98    formats, FORMAT indicates which one is being used, otherwise it
  99    is NULL.  When STARTED is false, they are both NULL.  */
 100 extern observable<struct inferior */* inferior */, int /* started */,
 101                   const char */* method */, const char */* format */>
 102     record_changed;
 103
 104 /* The shared library specified by SOLIB has been loaded.  Note that
 105    when gdb calls this observer, the library's symbols probably
 106    haven't been loaded yet.  */
 107 extern observable<struct so_list */* solib */> solib_loaded;
 108
 109 /* The shared library specified by SOLIB has been unloaded.  Note
 110    that when gdb calls this observer, the library's symbols have not
 111    been unloaded yet, and thus are still available.  */
 112 extern observable<struct so_list */* solib */> solib_unloaded;
 113
 114 /* The symbol file specified by OBJFILE has been loaded.  Called
 115    with OBJFILE equal to NULL to indicate previously loaded symbol
 116    table data has now been invalidated.  */
 117 extern observable<struct objfile */* objfile */> new_objfile;
 118
 119 /* The object file specified by OBJFILE is about to be freed.  */
 120 extern observable<struct objfile */* objfile */> free_objfile;
 121
 122 /* The thread specified by T has been created.  */
 123 extern observable<struct thread_info */* t */> new_thread;
 124
 125 /* The thread specified by T has exited.  The SILENT argument
 126    indicates that gdb is removing the thread from its tables without
 127    wanting to notify the user about it.  */
 128 extern observable<struct thread_info */* t */, int /* silent */> thread_exit;
 129
 130 /* An explicit stop request was issued to PTID.  If PTID equals
 131    minus_one_ptid, the request applied to all threads.  If
 132    ptid_is_pid(PTID) returns true, the request applied to all
 133    threads of the process pointed at by PTID.  Otherwise, the
 134    request applied to the single thread pointed at by PTID.  */
 135 extern observable<ptid_t /* ptid */> thread_stop_requested;
 136
 137 /* The target was resumed.  The PTID parameter specifies which
 138    thread was resume, and may be RESUME_ALL if all threads are
 139    resumed.  */
 140 extern observable<ptid_t /* ptid */> target_resumed;
 141
 142 /* The target is about to be proceeded.  */
 143 extern observable<> about_to_proceed;
 144
 145 /* A new breakpoint B has been created.  */
 146 extern observable<struct breakpoint */* b */> breakpoint_created;
 147
 148 /* A breakpoint has been destroyed.  The argument B is the
 149    pointer to the destroyed breakpoint.  */
 150 extern observable<struct breakpoint */* b */> breakpoint_deleted;
 151
 152 /* A breakpoint has been modified in some way.  The argument B
 153    is the modified breakpoint.  */
 154 extern observable<struct breakpoint */* b */> breakpoint_modified;
 155
 156 /* The trace frame is changed to TFNUM (e.g., by using the 'tfind'
 157    command).  If TFNUM is negative, it means gdb resumes live
 158    debugging.  The number of the tracepoint associated with this
 159    traceframe is TPNUM.  */
 160 extern observable<int /* tfnum */, int /* tpnum */> traceframe_changed;
 161
 162 /* The current architecture has changed.  The argument NEWARCH is a
 163    pointer to the new architecture.  */
 164 extern observable<struct gdbarch */* newarch */> architecture_changed;
 165
 166 /* The thread's ptid has changed.  The OLD_PTID parameter specifies
 167    the old value, and NEW_PTID specifies the new value.  */
 168 extern observable<ptid_t /* old_ptid */, ptid_t /* new_ptid */>
 169     thread_ptid_changed;
 170
 171 /* The inferior INF has been added to the list of inferiors.  At
 172    this point, it might not be associated with any process.  */
 173 extern observable<struct inferior */* inf */> inferior_added;
 174
 175 /* The inferior identified by INF has been attached to a
 176    process.  */
 177 extern observable<struct inferior */* inf */> inferior_appeared;
 178
 179 /* Either the inferior associated with INF has been detached from
 180    the process, or the process has exited.  */
 181 extern observable<struct inferior */* inf */> inferior_exit;
 182
 183 /* The inferior INF has been removed from the list of inferiors.
 184    This method is called immediately before freeing INF.  */
 185 extern observable<struct inferior */* inf */> inferior_removed;
 186
 187 /* Bytes from DATA to DATA + LEN have been written to the inferior
 188    at ADDR.  */
 189 extern observable<struct inferior */* inferior */, CORE_ADDR /* addr */,
 190                   ssize_t /* len */, const bfd_byte */* data */>
 191     memory_changed;
 192
 193 /* Called before a top-level prompt is displayed.  CURRENT_PROMPT is
 194    the current top-level prompt.  */
 195 extern observable<const char */* current_prompt */> before_prompt;
 196
 197 /* Variable gdb_datadir has been set.  The value may not necessarily
 198    change.  */
 199 extern observable<> gdb_datadir_changed;
 200
 201 /* The parameter of some 'set' commands in console are changed.
 202    This method is called after a command 'set param value'.  PARAM
 203    is the parameter of 'set' command, and VALUE is the value of
 204    changed parameter.  */
 205 extern observable<const char */* param */, const char */* value */>
 206     command_param_changed;
 207
 208 /* The new trace state variable TSV is created.  */
 209 extern observable<const struct trace_state_variable */* tsv */> tsv_created;
 210
 211 /* The trace state variable TSV is deleted.  If TSV is NULL, all
 212    trace state variables are deleted.  */
 213 extern observable<const struct trace_state_variable */* tsv */> tsv_deleted;
 214
 215 /* The trace state value TSV is modified.  */
 216 extern observable<const struct trace_state_variable */* tsv */> tsv_modified;
 217
 218 /* An inferior function at ADDRESS is about to be called in thread
 219    THREAD.  */
 220 extern observable<ptid_t /* thread */, CORE_ADDR /* address */>
 221     inferior_call_pre;
 222
 223 /* The inferior function at ADDRESS has just been called.  This
 224    observer is called even if the inferior exits during the call.
 225    THREAD is the thread in which the function was called, which may
 226    be different from the current thread.  */
 227 extern observable<ptid_t /* thread */, CORE_ADDR /* address */>
 228     inferior_call_post;
 229
 230 /* A register in the inferior has been modified by the gdb user.  */
 231 extern observable<struct frame_info */* frame */, int /* regnum */>
 232     register_changed;
 233
 234 /* The user-selected inferior, thread and/or frame has changed.  The
 235    user_select_what flag specifies if the inferior, thread and/or
 236    frame has changed.  */
 237 extern observable<user_selected_what /* selection */>
 238     user_selected_context_changed;
 239
 240 /* This is notified when the source styling setting has changed and
 241    should be reconsulted.  */
 242 extern observable<> source_styling_changed;
 243
 244 } /* namespace observers */
 245
 246 } /* namespace gdb */
 247
 248 #endif /* OBSERVABLE_H */