gdb/infrun.h

   1 /* Copyright (C) 1986-2021 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 struct frame_info;
  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(msg) \
  44   scoped_debug_start_end (debug_infrun, "infrun", msg)
  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 /* Nonzero if we want to give control to the user when we're notified
  52    of shared library events by the dynamic linker.  */
  53 extern int stop_on_solib_events;
  54
  55 /* True if execution commands resume all threads of all processes by
  56    default; otherwise, resume only threads of the current inferior
  57    process.  */
  58 extern bool sched_multi;
  59
  60 /* When set, stop the 'step' command if we enter a function which has
  61    no line number information.  The normal behavior is that we step
  62    over such function.  */
  63 extern bool step_stop_if_no_debug;
  64
  65 /* If set, the inferior should be controlled in non-stop mode.  In
  66    this mode, each thread is controlled independently.  Execution
  67    commands apply only to the selected thread by default, and stop
  68    events stop only the thread that had the event -- the other threads
  69    are kept running freely.  */
  70 extern bool non_stop;
  71
  72 /* When set (default), the target should attempt to disable the
  73    operating system's address space randomization feature when
  74    starting an inferior.  */
  75 extern bool disable_randomization;
  76
  77 /* Returns a unique identifier for the current stop.  This can be used
  78    to tell whether a command has proceeded the inferior past the
  79    current location.  */
  80 extern ULONGEST get_stop_id (void);
  81
  82 /* Reverse execution.  */
  83 enum exec_direction_kind
  84   {
  85     EXEC_FORWARD,
  86     EXEC_REVERSE
  87   };
  88
  89 /* The current execution direction.  */
  90 extern enum exec_direction_kind execution_direction;
  91
  92 extern void start_remote (int from_tty);
  93
  94 /* Clear out all variables saying what to do when inferior is
  95    continued or stepped.  First do this, then set the ones you want,
  96    then call `proceed'.  STEP indicates whether we're preparing for a
  97    step/stepi command.  */
  98 extern void clear_proceed_status (int step);
  99
 100 extern void proceed (CORE_ADDR, enum gdb_signal);
 101
 102 /* Return a ptid representing the set of threads that we will proceed,
 103    in the perspective of the user/frontend.  We may actually resume
 104    fewer threads at first, e.g., if a thread is stopped at a
 105    breakpoint that needs stepping-off, but that should not be visible
 106    to the user/frontend, and neither should the frontend/user be
 107    allowed to proceed any of the threads that happen to be stopped for
 108    internal run control handling, if a previous command wanted them
 109    resumed.  */
 110 extern ptid_t user_visible_resume_ptid (int step);
 111
 112 /* Return the process_stratum target that we will proceed, in the
 113    perspective of the user/frontend.  If RESUME_PTID is
 114    MINUS_ONE_PTID, then we'll resume all threads of all targets, so
 115    the function returns NULL.  Otherwise, we'll be resuming a process
 116    or thread of the current process, so we return the current
 117    inferior's process stratum target.  */
 118 extern process_stratum_target *user_visible_resume_target (ptid_t resume_ptid);
 119
 120 /* Return control to GDB when the inferior stops for real.  Print
 121    appropriate messages, remove breakpoints, give terminal our modes,
 122    and run the stop hook.  Returns true if the stop hook proceeded the
 123    target, false otherwise.  */
 124 extern int normal_stop (void);
 125
 126 /* Return the cached copy of the last target/ptid/waitstatus returned
 127    by target_wait()/deprecated_target_wait_hook().  The data is
 128    actually cached by handle_inferior_event(), which gets called
 129    immediately after target_wait()/deprecated_target_wait_hook().  */
 130 extern void get_last_target_status (process_stratum_target **target,
 131                                     ptid_t *ptid,
 132                                     struct target_waitstatus *status);
 133
 134 /* Set the cached copy of the last target/ptid/waitstatus.  */
 135 extern void set_last_target_status (process_stratum_target *target, ptid_t ptid,
 136                                     struct target_waitstatus status);
 137
 138 /* Clear the cached copy of the last ptid/waitstatus returned by
 139    target_wait().  */
 140 extern void nullify_last_target_wait_ptid ();
 141
 142 /* Stop all threads.  Only returns after everything is halted.  */
 143 extern void stop_all_threads (void);
 144
 145 extern void prepare_for_detach (void);
 146
 147 extern void fetch_inferior_event ();
 148
 149 extern void init_wait_for_inferior (void);
 150
 151 extern void insert_step_resume_breakpoint_at_sal (struct gdbarch *,
 152                                                   struct symtab_and_line ,
 153                                                   struct frame_id);
 154
 155 /* Returns true if we're trying to step past the instruction at
 156    ADDRESS in ASPACE.  */
 157 extern int stepping_past_instruction_at (struct address_space *aspace,
 158                                          CORE_ADDR address);
 159
 160 /* Returns true if thread whose thread number is THREAD is stepping
 161    over a breakpoint.  */
 162 extern int thread_is_stepping_over_breakpoint (int thread);
 163
 164 /* Returns true if we're trying to step past an instruction that
 165    triggers a non-steppable watchpoint.  */
 166 extern int stepping_past_nonsteppable_watchpoint (void);
 167
 168 /* Record in TP the frame and location we're currently stepping through.  */
 169 extern void set_step_info (thread_info *tp,
 170                            struct frame_info *frame,
 171                            struct symtab_and_line sal);
 172
 173 /* Several print_*_reason helper functions to print why the inferior
 174    has stopped to the passed in UIOUT.  */
 175
 176 /* Signal received, print why the inferior has stopped.  */
 177 extern void print_signal_received_reason (struct ui_out *uiout,
 178                                           enum gdb_signal siggnal);
 179
 180 /* Print why the inferior has stopped.  We are done with a
 181    step/next/si/ni command, print why the inferior has stopped.  */
 182 extern void print_end_stepping_range_reason (struct ui_out *uiout);
 183
 184 /* The inferior was terminated by a signal, print why it stopped.  */
 185 extern void print_signal_exited_reason (struct ui_out *uiout,
 186                                         enum gdb_signal siggnal);
 187
 188 /* The inferior program is finished, print why it stopped.  */
 189 extern void print_exited_reason (struct ui_out *uiout, int exitstatus);
 190
 191 /* Reverse execution: target ran out of history info, print why the
 192    inferior has stopped.  */
 193 extern void print_no_history_reason (struct ui_out *uiout);
 194
 195 /* Print the result of a function at the end of a 'finish' command.
 196    RV points at an object representing the captured return value/type
 197    and its position in the value history.  */
 198
 199 extern void print_return_value (struct ui_out *uiout,
 200                                 struct return_value_info *rv);
 201
 202 /* Print current location without a level number, if we have changed
 203    functions or hit a breakpoint.  Print source line if we have one.
 204    If the execution command captured a return value, print it.  If
 205    DISPLAYS is false, do not call 'do_displays'.  */
 206
 207 extern void print_stop_event (struct ui_out *uiout, bool displays = true);
 208
 209 /* Pretty print the results of target_wait, for debugging purposes.  */
 210
 211 extern void print_target_wait_results (ptid_t waiton_ptid, ptid_t result_ptid,
 212                                        const struct target_waitstatus *ws);
 213
 214 extern int signal_stop_state (int);
 215
 216 extern int signal_print_state (int);
 217
 218 extern int signal_pass_state (int);
 219
 220 extern int signal_stop_update (int, int);
 221
 222 extern int signal_print_update (int, int);
 223
 224 extern int signal_pass_update (int, int);
 225
 226 extern void update_signals_program_target (void);
 227
 228 /* Clear the convenience variables associated with the exit of the
 229    inferior.  Currently, those variables are $_exitcode and
 230    $_exitsignal.  */
 231 extern void clear_exit_convenience_vars (void);
 232
 233 /* Dump LEN bytes at BUF in hex to a string and return it.  */
 234 extern std::string displaced_step_dump_bytes (const gdb_byte *buf, size_t len);
 235
 236 extern void update_observer_mode (void);
 237
 238 extern void signal_catch_update (const unsigned int *);
 239
 240 /* In some circumstances we allow a command to specify a numeric
 241    signal.  The idea is to keep these circumstances limited so that
 242    users (and scripts) develop portable habits.  For comparison,
 243    POSIX.2 `kill' requires that 1,2,3,6,9,14, and 15 work (and using a
 244    numeric signal at all is obsolescent.  We are slightly more lenient
 245    and allow 1-15 which should match host signal numbers on most
 246    systems.  Use of symbolic signal names is strongly encouraged.  */
 247 enum gdb_signal gdb_signal_from_command (int num);
 248
 249 /* Enables/disables infrun's async event source in the event loop.  */
 250 extern void infrun_async (int enable);
 251
 252 /* Call infrun's event handler the next time through the event
 253    loop.  */
 254 extern void mark_infrun_async_event_handler (void);
 255
 256 /* The global chain of threads that need to do a step-over operation
 257    to get past e.g., a breakpoint.  */
 258 extern thread_step_over_list global_thread_step_over_list;
 259
 260 /* Remove breakpoints if possible (usually that means, if everything
 261    is stopped).  On failure, print a message.  */
 262 extern void maybe_remove_breakpoints (void);
 263
 264 /* If a UI was in sync execution mode, and now isn't, restore its
 265    prompt (a synchronous execution command has finished, and we're
 266    ready for input).  */
 267 extern void all_uis_check_sync_execution_done (void);
 268
 269 /* If a UI was in sync execution mode, and hasn't displayed the prompt
 270    yet, re-disable its prompt (a synchronous execution command was
 271    started or re-started).  */
 272 extern void all_uis_on_sync_execution_starting (void);
 273
 274 /* In all-stop, restart the target if it had to be stopped to
 275    detach.  */
 276 extern void restart_after_all_stop_detach (process_stratum_target *proc_target);
 277
 278 /* RAII object to temporarily disable the requirement for target
 279    stacks to commit their resumed threads.
 280
 281    On construction, set process_stratum_target::commit_resumed_state
 282    to false for all process_stratum targets in all target
 283    stacks.
 284
 285    On destruction (or if reset_and_commit() is called), set
 286    process_stratum_target::commit_resumed_state to true for all
 287    process_stratum targets in all target stacks, except those that:
 288
 289      - have no resumed threads
 290      - have a resumed thread with a pending status
 291
 292    target_commit_resumed is not called in the destructor, because its
 293    implementations could throw, and we don't to swallow that error in
 294    a destructor.  Instead, the caller should call the
 295    reset_and_commit_resumed() method so that an eventual exception can
 296    propagate.  "reset" in the method name refers to the fact that this
 297    method has the same effect as the destructor, in addition to
 298    committing resumes.
 299
 300    The creation of nested scoped_disable_commit_resumed objects is
 301    tracked, such that only the outermost instance actually does
 302    something, for cases like this:
 303
 304      void
 305      inner_func ()
 306      {
 307        scoped_disable_commit_resumed disable;
 308
 309        // do stuff
 310
 311        disable.reset_and_commit ();
 312      }
 313
 314      void
 315      outer_func ()
 316      {
 317        scoped_disable_commit_resumed disable;
 318
 319        for (... each thread ...)
 320          inner_func ();
 321
 322        disable.reset_and_commit ();
 323      }
 324
 325    In this case, we don't want the `disable` destructor in
 326    `inner_func` to require targets to commit resumed threads, so that
 327    the `reset_and_commit()` call in `inner_func` doesn't actually
 328    resume threads.  */
 329
 330 struct scoped_disable_commit_resumed
 331 {
 332   explicit scoped_disable_commit_resumed (const char *reason);
 333   ~scoped_disable_commit_resumed ();
 334
 335   DISABLE_COPY_AND_ASSIGN (scoped_disable_commit_resumed);
 336
 337   /* Undoes the disabling done by the ctor, and calls
 338      maybe_call_commit_resumed_all_targets().  */
 339   void reset_and_commit ();
 340
 341 private:
 342   /* Undoes the disabling done by the ctor.  */
 343   void reset ();
 344
 345   /* Whether this object has been reset.  */
 346   bool m_reset = false;
 347
 348   const char *m_reason;
 349   bool m_prev_enable_commit_resumed;
 350 };
 351
 352 /* Call target_commit_resumed method on all target stacks whose
 353    process_stratum target layer has COMMIT_RESUME_STATE set.  */
 354
 355 extern void maybe_call_commit_resumed_all_targets ();
 356
 357 /* RAII object to temporarily enable the requirement for target stacks
 358    to commit their resumed threads.  This is the inverse of
 359    scoped_disable_commit_resumed.  The constructor calls the
 360    maybe_call_commit_resumed_all_targets function itself, since it's
 361    OK to throw from a constructor.  */
 362
 363 struct scoped_enable_commit_resumed
 364 {
 365   explicit scoped_enable_commit_resumed (const char *reason);
 366   ~scoped_enable_commit_resumed ();
 367
 368   DISABLE_COPY_AND_ASSIGN (scoped_enable_commit_resumed);
 369
 370 private:
 371   const char *m_reason;
 372   bool m_prev_enable_commit_resumed;
 373 };
 374
 375
 376 #endif /* INFRUN_H */