gdb/observable.h

   1 /* Observers
   2
   3    Copyright (C) 2016-2018 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 #if !defined (GDB_OBSERVER_H)
  21 #define GDB_OBSERVER_H
  22
  23 #include "common/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 *, int> normal_stop;
  53
  54 /* The inferior was stopped by a signal.  */
  55 extern observable<enum gdb_signal> 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> signal_exited;
  62
  63 /* The inferior program is finished.  */
  64 extern observable<int> 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_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 *, int> inferior_created;
  90
  91 /* The status of process record for inferior inferior in gdb has
  92    changed.  The process record is started if started is true, and
  93    the process record is stopped if started is false.
  94
  95    When started is true, method indicates the short name of the
  96    method used for recording.  If the method supports multiple
  97    formats, format indicates which one is being used, otherwise it
  98    is NULL.  When started is false, they are both NULL.  */
  99 extern observable<struct inferior *, int, const char *, const char *>
 100     record_changed;
 101
 102 /* The shared library specified by solib has been loaded.  Note that
 103    when gdb calls this observer, the library's symbols probably
 104    haven't been loaded yet.  */
 105 extern observable<struct so_list *> solib_loaded;
 106
 107 /* The shared library specified by solib has been unloaded.  Note
 108    that when gdb calls this observer, the library's symbols have not
 109    been unloaded yet, and thus are still available.  */
 110 extern observable<struct so_list *> solib_unloaded;
 111
 112 /* The symbol file specified by objfile has been loaded.  Called
 113    with objfile equal to NULL to indicate previously loaded symbol
 114    table data has now been invalidated.  */
 115 extern observable<struct objfile *> new_objfile;
 116
 117 /* The object file specified by objfile is about to be freed.  */
 118 extern observable<struct objfile *> free_objfile;
 119
 120 /* The thread specified by t has been created.  */
 121 extern observable<struct thread_info *> new_thread;
 122
 123 /* The thread specified by t has exited.  The silent argument
 124    indicates that gdb is removing the thread from its tables without
 125    wanting to notify the user about it.  */
 126 extern observable<struct thread_info *, int> thread_exit;
 127
 128 /* An explicit stop request was issued to ptid.  If ptid equals
 129    minus_one_ptid, the request applied to all threads.  If
 130    ptid_is_pid(ptid) returns true, the request applied to all
 131    threads of the process pointed at by ptid.  Otherwise, the
 132    request applied to the single thread pointed at by ptid.  */
 133 extern observable<ptid_t> thread_stop_requested;
 134
 135 /* The target was resumed.  The ptid parameter specifies which
 136    thread was resume, and may be RESUME_ALL if all threads are
 137    resumed.  */
 138 extern observable<ptid_t> target_resumed;
 139
 140 /* The target is about to be proceeded.  */
 141 extern observable<> about_to_proceed;
 142
 143 /* A new breakpoint b has been created.  */
 144 extern observable<struct breakpoint *> breakpoint_created;
 145
 146 /* A breakpoint has been destroyed.  The argument b is the
 147    pointer to the destroyed breakpoint.  */
 148 extern observable<struct breakpoint *> breakpoint_deleted;
 149
 150 /* A breakpoint has been modified in some way.  The argument b
 151    is the modified breakpoint.  */
 152 extern observable<struct breakpoint *> breakpoint_modified;
 153
 154 /* The trace frame is changed to tfnum (e.g., by using the 'tfind'
 155    command).  If tfnum is negative, it means gdb resumes live
 156    debugging.  The number of the tracepoint associated with this
 157    traceframe is tpnum.  */
 158 extern observable<int, int> traceframe_changed;
 159
 160 /* The current architecture has changed.  The argument newarch is a
 161    pointer to the new architecture.  */
 162 extern observable<struct gdbarch *> architecture_changed;
 163
 164 /* The thread's ptid has changed.  The old_ptid parameter specifies
 165    the old value, and new_ptid specifies the new value.  */
 166 extern observable<ptid_t, ptid_t> thread_ptid_changed;
 167
 168 /* The inferior inf has been added to the list of inferiors.  At
 169    this point, it might not be associated with any process.  */
 170 extern observable<struct inferior *> inferior_added;
 171
 172 /* The inferior identified by inf has been attached to a
 173    process.  */
 174 extern observable<struct inferior *> inferior_appeared;
 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 *> 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 *> inferior_removed;
 183
 184 /* Bytes from data to data + len have been written to the inferior
 185    at addr.  */
 186 extern observable<struct inferior *, CORE_ADDR, ssize_t, const bfd_byte *>
 187     memory_changed;
 188
 189 /* Called before a top-level prompt is displayed.  current_prompt is
 190    the current top-level prompt.  */
 191 extern observable<const char *> before_prompt;
 192
 193 /* Variable gdb_datadir has been set.  The value may not necessarily
 194    change.  */
 195 extern observable<> gdb_datadir_changed;
 196
 197 /* The parameter of some 'set' commands in console are changed.
 198    This method is called after a command 'set param value'.  param
 199    is the parameter of 'set' command, and value is the value of
 200    changed parameter.  */
 201 extern observable<const char *, const char *> command_param_changed;
 202
 203 /* The new trace state variable tsv is created.  */
 204 extern observable<const struct trace_state_variable *> tsv_created;
 205
 206 /* The trace state variable tsv is deleted.  If tsv is NULL, all
 207    trace state variables are deleted.  */
 208 extern observable<const struct trace_state_variable *> tsv_deleted;
 209
 210 /* The trace state value tsv is modified.  */
 211 extern observable<const struct trace_state_variable *> tsv_modified;
 212
 213 /* An inferior function at address is about to be called in thread
 214    thread.  */
 215 extern observable<ptid_t, CORE_ADDR> inferior_call_pre;
 216
 217 /* The inferior function at address has just been called.  This
 218    observer is called even if the inferior exits during the call.
 219    thread is the thread in which the function was called, which may
 220    be different from the current thread.  */
 221 extern observable<ptid_t, CORE_ADDR> inferior_call_post;
 222
 223 /* A register in the inferior has been modified by the gdb user.  */
 224 extern observable<struct frame_info *, int> register_changed;
 225
 226 /* The user-selected inferior, thread and/or frame has changed.  The
 227    user_select_what flag specifies if the inferior, thread and/or
 228    frame has changed.  */
 229 extern observable<user_selected_what> user_selected_context_changed;
 230
 231 } /* namespace observers */
 232
 233 } /* namespace gdb */
 234
 235 #endif /* GDB_OBSERVER_H */