gdb/infrun.h

   1 /* Copyright (C) 1986-2023 Free Software Foundation, Inc.
   2
   3    This file is part of GDB.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  17
  18 #ifndef INFRUN_H
  19 #define INFRUN_H 1
  20
  21 #include "gdbthread.h"
  22 #include "symtab.h"
  23 #include "gdbsupport/byte-vector.h"
  24 #include "gdbsupport/intrusive_list.h"
  25
  26 struct target_waitstatus;
  27 class frame_info_ptr;
  28 struct address_space;
  29 struct return_value_info;
  30 struct process_stratum_target;
  31 struct thread_info;
  32
  33 /* True if we are debugging run control.  */
  34 extern bool debug_infrun;
  35
  36 /* Print an "infrun" debug statement.  */
  37
  38 #define infrun_debug_printf(fmt, ...) \
  39   debug_prefixed_printf_cond (debug_infrun, "infrun", fmt, ##__VA_ARGS__)
  40
  41 /* Print "infrun" start/end debug statements.  */
  42
  43 #define INFRUN_SCOPED_DEBUG_START_END(fmt, ...) \
  44   scoped_debug_start_end (debug_infrun, "infrun", fmt, ##__VA_ARGS__)
  45
  46 /* Print "infrun" enter/exit debug statements.  */
  47
  48 #define INFRUN_SCOPED_DEBUG_ENTER_EXIT \
  49   scoped_debug_enter_exit (debug_infrun, "infrun")
  50
  51 /* A infrun debug helper routine to print out all the threads in the set
  52    THREADS (which should be a range type that returns thread_info*
  53    objects).
  54
  55    The TITLE is a string that is printed before the list of threads.
  56
  57    Output is only produced when 'set debug infrun on'.  */
  58
  59 template<typename ThreadRange>
  60 static inline void
  61 infrun_debug_show_threads (const char *title, ThreadRange threads)
  62 {
  63   if (debug_infrun)
  64     {
  65       INFRUN_SCOPED_DEBUG_ENTER_EXIT;
  66
  67       infrun_debug_printf ("%s:", title);
  68       for (thread_info *thread : threads)
  69         infrun_debug_printf ("  thread %s, executing = %d, resumed = %d, "
  70                              "state = %s",
  71                              thread->ptid.to_string ().c_str (),
  72                              thread->executing (),
  73                              thread->resumed (),
  74                              thread_state_string (thread->state));
  75     }
  76 }
  77
  78
  79 /* Nonzero if we want to give control to the user when we're notified
  80    of shared library events by the dynamic linker.  */
  81 extern int stop_on_solib_events;
  82
  83 /* True if execution commands resume all threads of all processes by
  84    default; otherwise, resume only threads of the current inferior
  85    process.  */
  86 extern bool sched_multi;
  87
  88 /* When set, stop the 'step' command if we enter a function which has
  89    no line number information.  The normal behavior is that we step
  90    over such function.  */
  91 extern bool step_stop_if_no_debug;
  92
  93 /* If set, the inferior should be controlled in non-stop mode.  In
  94    this mode, each thread is controlled independently.  Execution
  95    commands apply only to the selected thread by default, and stop
  96    events stop only the thread that had the event -- the other threads
  97    are kept running freely.  */
  98 extern bool non_stop;
  99
 100 /* When set (default), the target should attempt to disable the
 101    operating system's address space randomization feature when
 102    starting an inferior.  */
 103 extern bool disable_randomization;
 104
 105 /* Returns a unique identifier for the current stop.  This can be used
 106    to tell whether a command has proceeded the inferior past the
 107    current location.  */
 108 extern ULONGEST get_stop_id (void);
 109
 110 /* Reverse execution.  */
 111 enum exec_direction_kind
 112   {
 113     EXEC_FORWARD,
 114     EXEC_REVERSE
 115   };
 116
 117 /* The current execution direction.  */
 118 extern enum exec_direction_kind execution_direction;
 119
 120 /* Call this to point 'previous_thread' at the thread returned by
 121    inferior_thread, or at nullptr, if there's no selected thread.  */
 122 extern void update_previous_thread ();
 123
 124 /* Get a weak reference to 'previous_thread'.  */
 125 extern thread_info *get_previous_thread ();
 126
 127 extern void start_remote (int from_tty);
 128
 129 /* Clear out all variables saying what to do when inferior is
 130    continued or stepped.  First do this, then set the ones you want,
 131    then call `proceed'.  STEP indicates whether we're preparing for a
 132    step/stepi command.  */
 133 extern void clear_proceed_status (int step);
 134
 135 extern void proceed (CORE_ADDR, enum gdb_signal);
 136
 137 /* Return a ptid representing the set of threads that we will proceed,
 138    in the perspective of the user/frontend.  We may actually resume
 139    fewer threads at first, e.g., if a thread is stopped at a
 140    breakpoint that needs stepping-off, but that should not be visible
 141    to the user/frontend, and neither should the frontend/user be
 142    allowed to proceed any of the threads that happen to be stopped for
 143    internal run control handling, if a previous command wanted them
 144    resumed.  */
 145 extern ptid_t user_visible_resume_ptid (int step);
 146
 147 /* Return the process_stratum target that we will proceed, in the
 148    perspective of the user/frontend.  If RESUME_PTID is
 149    MINUS_ONE_PTID, then we'll resume all threads of all targets, so
 150    the function returns NULL.  Otherwise, we'll be resuming a process
 151    or thread of the current process, so we return the current
 152    inferior's process stratum target.  */
 153 extern process_stratum_target *user_visible_resume_target (ptid_t resume_ptid);
 154
 155 /* Return control to GDB when the inferior stops for real.  Print
 156    appropriate messages, remove breakpoints, give terminal our modes,
 157    and run the stop hook.  Returns true if the stop hook proceeded the
 158    target, false otherwise.  */
 159 extern bool normal_stop ();
 160
 161 /* Return the cached copy of the last target/ptid/waitstatus returned
 162    by target_wait().  The data is actually cached by handle_inferior_event(),
 163    which gets called immediately after target_wait().  */
 164 extern void get_last_target_status (process_stratum_target **target,
 165                                     ptid_t *ptid,
 166                                     struct target_waitstatus *status);
 167
 168 /* Set the cached copy of the last target/ptid/waitstatus.  */
 169 extern void set_last_target_status (process_stratum_target *target, ptid_t ptid,
 170                                     const target_waitstatus &status);
 171
 172 /* Clear the cached copy of the last ptid/waitstatus returned by
 173    target_wait().  */
 174 extern void nullify_last_target_wait_ptid ();
 175
 176 /* Stop all threads.  Only returns after everything is halted.
 177
 178    REASON is a string indicating the reason why we stop all threads, used in
 179    debug messages.
 180
 181    If INF is non-nullptr, stop all threads of that inferior.  Otherwise, stop
 182    all threads of all inferiors.  */
 183 extern void stop_all_threads (const char *reason, inferior *inf = nullptr);
 184
 185 extern void prepare_for_detach (void);
 186
 187 extern void fetch_inferior_event ();
 188
 189 extern void init_wait_for_inferior (void);
 190
 191 extern void insert_step_resume_breakpoint_at_sal (struct gdbarch *,
 192                                                   struct symtab_and_line ,
 193                                                   struct frame_id);
 194
 195 /* Returns true if we're trying to step past the instruction at
 196    ADDRESS in ASPACE.  */
 197 extern int stepping_past_instruction_at (struct address_space *aspace,
 198                                          CORE_ADDR address);
 199
 200 /* Returns true if thread whose thread number is THREAD is stepping
 201    over a breakpoint.  */
 202 extern int thread_is_stepping_over_breakpoint (int thread);
 203
 204 /* Returns true if we're trying to step past an instruction that
 205    triggers a non-steppable watchpoint.  */
 206 extern int stepping_past_nonsteppable_watchpoint (void);
 207
 208 /* Record in TP the frame and location we're currently stepping through.  */
 209 extern void set_step_info (thread_info *tp,
 210                            frame_info_ptr frame,
 211                            struct symtab_and_line sal);
 212
 213 /* Notify interpreters and observers that the current inferior has stopped with
 214    signal SIG.  */
 215 extern void notify_signal_received (gdb_signal sig);
 216
 217 /* Notify interpreters and observers that the current inferior has stopped
 218    normally.  */
 219 extern void notify_normal_stop (bpstat *bs, int print_frame);
 220
 221 /* Notify interpreters and observers that the user focus has changed.  */
 222 extern void notify_user_selected_context_changed (user_selected_what selection);
 223
 224 /* Several print_*_reason helper functions to print why the inferior
 225    has stopped to the passed in UIOUT.  */
 226
 227 /* Signal received, print why the inferior has stopped.  */
 228 extern void print_signal_received_reason (struct ui_out *uiout,
 229                                           enum gdb_signal siggnal);
 230
 231 /* The inferior was terminated by a signal, print why it stopped.  */
 232 extern void print_signal_exited_reason (struct ui_out *uiout,
 233                                         enum gdb_signal siggnal);
 234
 235 /* The inferior program is finished, print why it stopped.  */
 236 extern void print_exited_reason (struct ui_out *uiout, int exitstatus);
 237
 238 /* Reverse execution: target ran out of history info, print why the
 239    inferior has stopped.  */
 240 extern void print_no_history_reason (struct ui_out *uiout);
 241
 242 /* Print the result of a function at the end of a 'finish' command.
 243    RV points at an object representing the captured return value/type
 244    and its position in the value history.  */
 245
 246 extern void print_return_value (struct ui_out *uiout,
 247                                 struct return_value_info *rv);
 248
 249 /* Print current location without a level number, if we have changed
 250    functions or hit a breakpoint.  Print source line if we have one.
 251    If the execution command captured a return value, print it.  If
 252    DISPLAYS is false, do not call 'do_displays'.  */
 253
 254 extern void print_stop_event (struct ui_out *uiout, bool displays = true);
 255
 256 /* Pretty print the results of target_wait, for debugging purposes.  */
 257
 258 extern void print_target_wait_results (ptid_t waiton_ptid, ptid_t result_ptid,
 259                                        const struct target_waitstatus &ws);
 260
 261 extern int signal_stop_state (int);
 262
 263 extern int signal_print_state (int);
 264
 265 extern int signal_pass_state (int);
 266
 267 extern int signal_stop_update (int, int);
 268
 269 extern int signal_print_update (int, int);
 270
 271 extern int signal_pass_update (int, int);
 272
 273 extern void update_signals_program_target (void);
 274
 275 /* Clear the convenience variables associated with the exit of the
 276    inferior.  Currently, those variables are $_exitcode and
 277    $_exitsignal.  */
 278 extern void clear_exit_convenience_vars (void);
 279
 280 extern void update_observer_mode (void);
 281
 282 extern void signal_catch_update (const unsigned int *);
 283
 284 /* In some circumstances we allow a command to specify a numeric
 285    signal.  The idea is to keep these circumstances limited so that
 286    users (and scripts) develop portable habits.  For comparison,
 287    POSIX.2 `kill' requires that 1,2,3,6,9,14, and 15 work (and using a
 288    numeric signal at all is obsolescent.  We are slightly more lenient
 289    and allow 1-15 which should match host signal numbers on most
 290    systems.  Use of symbolic signal names is strongly encouraged.  */
 291 enum gdb_signal gdb_signal_from_command (int num);
 292
 293 /* Enables/disables infrun's async event source in the event loop.  */
 294 extern void infrun_async (int enable);
 295
 296 /* Call infrun's event handler the next time through the event
 297    loop.  */
 298 extern void mark_infrun_async_event_handler (void);
 299
 300 /* The global chain of threads that need to do a step-over operation
 301    to get past e.g., a breakpoint.  */
 302 extern thread_step_over_list global_thread_step_over_list;
 303
 304 /* Remove breakpoints if possible (usually that means, if everything
 305    is stopped).  On failure, print a message.  */
 306 extern void maybe_remove_breakpoints (void);
 307
 308 /* If a UI was in sync execution mode, and now isn't, restore its
 309    prompt (a synchronous execution command has finished, and we're
 310    ready for input).  */
 311 extern void all_uis_check_sync_execution_done (void);
 312
 313 /* If a UI was in sync execution mode, and hasn't displayed the prompt
 314    yet, re-disable its prompt (a synchronous execution command was
 315    started or re-started).  */
 316 extern void all_uis_on_sync_execution_starting (void);
 317
 318 /* In all-stop, restart the target if it had to be stopped to
 319    detach.  */
 320 extern void restart_after_all_stop_detach (process_stratum_target *proc_target);
 321
 322 /* RAII object to temporarily disable the requirement for target
 323    stacks to commit their resumed threads.
 324
 325    On construction, set process_stratum_target::commit_resumed_state
 326    to false for all process_stratum targets in all target
 327    stacks.
 328
 329    On destruction (or if reset_and_commit() is called), set
 330    process_stratum_target::commit_resumed_state to true for all
 331    process_stratum targets in all target stacks, except those that:
 332
 333      - have no resumed threads
 334      - have a resumed thread with a pending status
 335
 336    target_commit_resumed is not called in the destructor, because its
 337    implementations could throw, and we don't to swallow that error in
 338    a destructor.  Instead, the caller should call the
 339    reset_and_commit_resumed() method so that an eventual exception can
 340    propagate.  "reset" in the method name refers to the fact that this
 341    method has the same effect as the destructor, in addition to
 342    committing resumes.
 343
 344    The creation of nested scoped_disable_commit_resumed objects is
 345    tracked, such that only the outermost instance actually does
 346    something, for cases like this:
 347
 348      void
 349      inner_func ()
 350      {
 351        scoped_disable_commit_resumed disable;
 352
 353        // do stuff
 354
 355        disable.reset_and_commit ();
 356      }
 357
 358      void
 359      outer_func ()
 360      {
 361        scoped_disable_commit_resumed disable;
 362
 363        for (... each thread ...)
 364          inner_func ();
 365
 366        disable.reset_and_commit ();
 367      }
 368
 369    In this case, we don't want the `disable` destructor in
 370    `inner_func` to require targets to commit resumed threads, so that
 371    the `reset_and_commit()` call in `inner_func` doesn't actually
 372    resume threads.  */
 373
 374 struct scoped_disable_commit_resumed
 375 {
 376   explicit scoped_disable_commit_resumed (const char *reason);
 377   ~scoped_disable_commit_resumed ();
 378
 379   DISABLE_COPY_AND_ASSIGN (scoped_disable_commit_resumed);
 380
 381   /* Undoes the disabling done by the ctor, and calls
 382      maybe_call_commit_resumed_all_targets().  */
 383   void reset_and_commit ();
 384
 385 private:
 386   /* Undoes the disabling done by the ctor.  */
 387   void reset ();
 388
 389   /* Whether this object has been reset.  */
 390   bool m_reset = false;
 391
 392   const char *m_reason;
 393   bool m_prev_enable_commit_resumed;
 394 };
 395
 396 /* Call target_commit_resumed method on all target stacks whose
 397    process_stratum target layer has COMMIT_RESUME_STATE set.  */
 398
 399 extern void maybe_call_commit_resumed_all_targets ();
 400
 401 /* RAII object to temporarily enable the requirement for target stacks
 402    to commit their resumed threads.  This is the inverse of
 403    scoped_disable_commit_resumed.  The constructor calls the
 404    maybe_call_commit_resumed_all_targets function itself, since it's
 405    OK to throw from a constructor.  */
 406
 407 struct scoped_enable_commit_resumed
 408 {
 409   explicit scoped_enable_commit_resumed (const char *reason);
 410   ~scoped_enable_commit_resumed ();
 411
 412   DISABLE_COPY_AND_ASSIGN (scoped_enable_commit_resumed);
 413
 414 private:
 415   const char *m_reason;
 416   bool m_prev_enable_commit_resumed;
 417 };
 418
 419
 420 #endif /* INFRUN_H */