gdb/inferior.h

   1 /* Variables that describe the inferior process running under GDB:
   2    Where it is, why it stopped, and how to step it.
   3
   4    Copyright (C) 1986-2022 Free Software Foundation, Inc.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #if !defined (INFERIOR_H)
  22 #define INFERIOR_H 1
  23
  24 #include <exception>
  25 #include <list>
  26
  27 struct target_waitstatus;
  28 struct frame_info;
  29 struct ui_file;
  30 struct type;
  31 struct gdbarch;
  32 struct regcache;
  33 struct ui_out;
  34 struct terminal_info;
  35 struct target_desc_info;
  36 struct inferior;
  37 struct thread_info;
  38
  39 /* For bpstat.  */
  40 #include "breakpoint.h"
  41
  42 /* For enum gdb_signal.  */
  43 #include "target.h"
  44
  45 /* For struct frame_id.  */
  46 #include "frame.h"
  47
  48 /* For gdb_environ.  */
  49 #include "gdbsupport/environ.h"
  50
  51 #include "progspace.h"
  52 #include "registry.h"
  53
  54 #include "symfile-add-flags.h"
  55 #include "gdbsupport/refcounted-object.h"
  56 #include "gdbsupport/forward-scope-exit.h"
  57 #include "gdbsupport/gdb_unique_ptr.h"
  58
  59 #include "gdbsupport/common-inferior.h"
  60 #include "gdbthread.h"
  61
  62 #include "process-stratum-target.h"
  63 #include "displaced-stepping.h"
  64
  65 struct infcall_suspend_state;
  66 struct infcall_control_state;
  67
  68 extern void restore_infcall_suspend_state (struct infcall_suspend_state *);
  69 extern void restore_infcall_control_state (struct infcall_control_state *);
  70
  71 /* A deleter for infcall_suspend_state that calls
  72    restore_infcall_suspend_state.  */
  73 struct infcall_suspend_state_deleter
  74 {
  75   void operator() (struct infcall_suspend_state *state) const
  76   {
  77     try
  78       {
  79         restore_infcall_suspend_state (state);
  80       }
  81     catch (const gdb_exception_error &e)
  82       {
  83         /* If we are restoring the inferior state due to an exception,
  84            some error message will be printed.  So, only warn the user
  85            when we cannot restore during normal execution.  */
  86         bool unwinding;
  87 #if __cpp_lib_uncaught_exceptions
  88         unwinding = std::uncaught_exceptions () > 0;
  89 #else
  90         unwinding = std::uncaught_exception ();
  91 #endif
  92         if (!unwinding)
  93           warning (_("Failed to restore inferior state: %s"), e.what ());
  94       }
  95   }
  96 };
  97
  98 /* A unique_ptr specialization for infcall_suspend_state.  */
  99 typedef std::unique_ptr<infcall_suspend_state, infcall_suspend_state_deleter>
 100     infcall_suspend_state_up;
 101
 102 extern infcall_suspend_state_up save_infcall_suspend_state ();
 103
 104 /* A deleter for infcall_control_state that calls
 105    restore_infcall_control_state.  */
 106 struct infcall_control_state_deleter
 107 {
 108   void operator() (struct infcall_control_state *state) const
 109   {
 110     restore_infcall_control_state (state);
 111   }
 112 };
 113
 114 /* A unique_ptr specialization for infcall_control_state.  */
 115 typedef std::unique_ptr<infcall_control_state, infcall_control_state_deleter>
 116     infcall_control_state_up;
 117
 118 extern infcall_control_state_up save_infcall_control_state ();
 119
 120 extern void discard_infcall_suspend_state (struct infcall_suspend_state *);
 121 extern void discard_infcall_control_state (struct infcall_control_state *);
 122
 123 extern readonly_detached_regcache *
 124   get_infcall_suspend_state_regcache (struct infcall_suspend_state *);
 125
 126 extern void set_sigint_trap (void);
 127
 128 extern void clear_sigint_trap (void);
 129
 130 /* Collected pid, tid, etc. of the debugged inferior.  When there's
 131    no inferior, inferior_ptid.pid () will be 0.  */
 132
 133 extern ptid_t inferior_ptid;
 134
 135 extern void generic_mourn_inferior (void);
 136
 137 extern CORE_ADDR unsigned_pointer_to_address (struct gdbarch *gdbarch,
 138                                               struct type *type,
 139                                               const gdb_byte *buf);
 140 extern void unsigned_address_to_pointer (struct gdbarch *gdbarch,
 141                                          struct type *type, gdb_byte *buf,
 142                                          CORE_ADDR addr);
 143 extern CORE_ADDR signed_pointer_to_address (struct gdbarch *gdbarch,
 144                                             struct type *type,
 145                                             const gdb_byte *buf);
 146 extern void address_to_signed_pointer (struct gdbarch *gdbarch,
 147                                        struct type *type, gdb_byte *buf,
 148                                        CORE_ADDR addr);
 149
 150 extern void reopen_exec_file (void);
 151
 152 /* From misc files */
 153
 154 extern void default_print_registers_info (struct gdbarch *gdbarch,
 155                                           struct ui_file *file,
 156                                           struct frame_info *frame,
 157                                           int regnum, int all);
 158
 159 /* Default implementation of gdbarch_print_float_info.  Print
 160    the values of all floating point registers.  */
 161
 162 extern void default_print_float_info (struct gdbarch *gdbarch,
 163                                       struct ui_file *file,
 164                                       struct frame_info *frame,
 165                                       const char *args);
 166
 167 extern void child_terminal_info (struct target_ops *self, const char *, int);
 168
 169 extern void child_terminal_ours (struct target_ops *self);
 170
 171 extern void child_terminal_ours_for_output (struct target_ops *self);
 172
 173 extern void child_terminal_inferior (struct target_ops *self);
 174
 175 extern void child_terminal_save_inferior (struct target_ops *self);
 176
 177 extern void child_terminal_init (struct target_ops *self);
 178
 179 extern void child_terminal_init_with_pgrp (int pgrp);
 180
 181 extern void child_pass_ctrlc (struct target_ops *self);
 182
 183 extern void child_interrupt (struct target_ops *self);
 184
 185 /* From fork-child.c */
 186
 187 /* Helper function to call STARTUP_INFERIOR with PID and NUM_TRAPS.
 188    This function already calls set_executing.  Return the ptid_t from
 189    STARTUP_INFERIOR.  */
 190 extern ptid_t gdb_startup_inferior (pid_t pid, int num_traps);
 191
 192 /* From infcmd.c */
 193
 194 /* Initial inferior setup.  Determines the exec file is not yet known,
 195    takes any necessary post-attaching actions, fetches the target
 196    description and syncs the shared library list.  */
 197
 198 extern void setup_inferior (int from_tty);
 199
 200 extern void post_create_inferior (int from_tty);
 201
 202 extern void attach_command (const char *, int);
 203
 204 extern const char *get_inferior_args (void);
 205
 206 extern void set_inferior_args (const char *);
 207
 208 extern void set_inferior_args_vector (int, char **);
 209
 210 extern void registers_info (const char *, int);
 211
 212 extern void continue_1 (int all_threads);
 213
 214 extern void interrupt_target_1 (bool all_threads);
 215
 216 using delete_longjmp_breakpoint_cleanup
 217   = FORWARD_SCOPE_EXIT (delete_longjmp_breakpoint);
 218
 219 extern void detach_command (const char *, int);
 220
 221 extern void notice_new_inferior (struct thread_info *, bool, int);
 222
 223 extern struct value *get_return_value (struct value *function,
 224                                        struct type *value_type);
 225
 226 /* Prepare for execution command.  TARGET is the target that will run
 227    the command.  BACKGROUND determines whether this is a foreground
 228    (synchronous) or background (asynchronous) command.  */
 229
 230 extern void prepare_execution_command (struct target_ops *target,
 231                                        int background);
 232
 233 /* Nonzero if stopped due to completion of a stack dummy routine.  */
 234
 235 extern enum stop_stack_kind stop_stack_dummy;
 236
 237 /* Nonzero if program stopped due to a random (unexpected) signal in
 238    inferior process.  */
 239
 240 extern int stopped_by_random_signal;
 241
 242 /* Print notices on inferior events (attach, detach, etc.), set with
 243    `set print inferior-events'.  */
 244 extern bool print_inferior_events;
 245
 246 /* Anything but NO_STOP_QUIETLY means we expect a trap and the caller
 247    will handle it themselves.  STOP_QUIETLY is used when running in
 248    the shell before the child program has been exec'd and when running
 249    through shared library loading.  STOP_QUIETLY_REMOTE is used when
 250    setting up a remote connection; it is like STOP_QUIETLY_NO_SIGSTOP
 251    except that there is no need to hide a signal.  */
 252
 253 /* STOP_QUIETLY_NO_SIGSTOP is used to handle a tricky situation with attach.
 254    When doing an attach, the kernel stops the debuggee with a SIGSTOP.
 255    On newer GNU/Linux kernels (>= 2.5.61) the handling of SIGSTOP for
 256    a ptraced process has changed.  Earlier versions of the kernel
 257    would ignore these SIGSTOPs, while now SIGSTOP is treated like any
 258    other signal, i.e. it is not muffled.
 259
 260    If the gdb user does a 'continue' after the 'attach', gdb passes
 261    the global variable stop_signal (which stores the signal from the
 262    attach, SIGSTOP) to the ptrace(PTRACE_CONT,...)  call.  This is
 263    problematic, because the kernel doesn't ignore such SIGSTOP
 264    now.  I.e. it is reported back to gdb, which in turn presents it
 265    back to the user.
 266
 267    To avoid the problem, we use STOP_QUIETLY_NO_SIGSTOP, which allows
 268    gdb to clear the value of stop_signal after the attach, so that it
 269    is not passed back down to the kernel.  */
 270
 271 enum stop_kind
 272   {
 273     NO_STOP_QUIETLY = 0,
 274     STOP_QUIETLY,
 275     STOP_QUIETLY_REMOTE,
 276     STOP_QUIETLY_NO_SIGSTOP
 277   };
 278
 279 \f
 280 /* Possible values for gdbarch_call_dummy_location.  */
 281 #define ON_STACK 1
 282 #define AT_ENTRY_POINT 4
 283
 284 /* Base class for target-specific inferior data.  */
 285
 286 struct private_inferior
 287 {
 288   virtual ~private_inferior () = 0;
 289 };
 290
 291 /* Inferior process specific part of `struct infcall_control_state'.
 292
 293    Inferior thread counterpart is `struct thread_control_state'.  */
 294
 295 struct inferior_control_state
 296 {
 297   inferior_control_state ()
 298     : stop_soon (NO_STOP_QUIETLY)
 299   {
 300   }
 301
 302   explicit inferior_control_state (enum stop_kind when)
 303     : stop_soon (when)
 304   {
 305   }
 306
 307   /* See the definition of stop_kind above.  */
 308   enum stop_kind stop_soon;
 309 };
 310
 311 /* Return a pointer to the current inferior.  */
 312 extern inferior *current_inferior ();
 313
 314 extern void set_current_inferior (inferior *);
 315
 316 /* Switch inferior (and program space) to INF, and switch to no thread
 317    selected.  */
 318 extern void switch_to_inferior_no_thread (inferior *inf);
 319
 320 /* GDB represents the state of each program execution with an object
 321    called an inferior.  An inferior typically corresponds to a process
 322    but is more general and applies also to targets that do not have a
 323    notion of processes.  Each run of an executable creates a new
 324    inferior, as does each attachment to an existing process.
 325    Inferiors have unique internal identifiers that are different from
 326    target process ids.  Each inferior may in turn have multiple
 327    threads running in it.
 328
 329    Inferiors are intrusively refcounted objects.  Unlike thread
 330    objects, being the user-selected inferior is considered a strong
 331    reference and is thus accounted for in the inferior object's
 332    refcount (see set_current_inferior).  When GDB needs to remember
 333    the selected inferior to later restore it, GDB temporarily bumps
 334    the inferior object's refcount, to prevent something deleting the
 335    inferior object before reverting back (e.g., due to a
 336    "remove-inferiors" command (see
 337    scoped_restore_current_inferior).  All other inferior
 338    references are considered weak references.  Inferiors are always
 339    listed exactly once in the inferior list, so placing an inferior in
 340    the inferior list is an implicit, not counted strong reference.  */
 341
 342 class inferior : public refcounted_object
 343 {
 344 public:
 345   explicit inferior (int pid);
 346   ~inferior ();
 347
 348   /* Returns true if we can delete this inferior.  */
 349   bool deletable () const { return refcount () == 0; }
 350
 351   /* Push T in this inferior's target stack.  */
 352   void push_target (struct target_ops *t)
 353   { m_target_stack.push (t); }
 354
 355   /* An overload that deletes the target on failure.  */
 356   void push_target (target_ops_up &&t)
 357   {
 358     m_target_stack.push (t.get ());
 359     t.release ();
 360   }
 361
 362   /* Unpush T from this inferior's target stack.  */
 363   int unpush_target (struct target_ops *t)
 364   { return m_target_stack.unpush (t); }
 365
 366   /* Returns true if T is pushed in this inferior's target stack.  */
 367   bool target_is_pushed (target_ops *t)
 368   { return m_target_stack.is_pushed (t); }
 369
 370   /* Find the target beneath T in this inferior's target stack.  */
 371   target_ops *find_target_beneath (const target_ops *t)
 372   { return m_target_stack.find_beneath (t); }
 373
 374   /* Return the target at the top of this inferior's target stack.  */
 375   target_ops *top_target ()
 376   { return m_target_stack.top (); }
 377
 378   /* Return the target at process_stratum level in this inferior's
 379      target stack.  */
 380   struct process_stratum_target *process_target ()
 381   { return (process_stratum_target *) m_target_stack.at (process_stratum); }
 382
 383   /* Return the target at STRATUM in this inferior's target stack.  */
 384   target_ops *target_at (enum strata stratum)
 385   { return m_target_stack.at (stratum); }
 386
 387   bool has_execution ()
 388   { return target_has_execution (this); }
 389
 390   /* Pointer to next inferior in singly-linked list of inferiors.  */
 391   struct inferior *next = NULL;
 392
 393   /* This inferior's thread list.  */
 394   thread_info *thread_list = nullptr;
 395
 396   /* Returns a range adapter covering the inferior's threads,
 397      including exited threads.  Used like this:
 398
 399        for (thread_info *thr : inf->threads ())
 400          { .... }
 401   */
 402   inf_threads_range threads ()
 403   { return inf_threads_range (this->thread_list); }
 404
 405   /* Returns a range adapter covering the inferior's non-exited
 406      threads.  Used like this:
 407
 408        for (thread_info *thr : inf->non_exited_threads ())
 409          { .... }
 410   */
 411   inf_non_exited_threads_range non_exited_threads ()
 412   { return inf_non_exited_threads_range (this->thread_list); }
 413
 414   /* Like inferior::threads(), but returns a range adapter that can be
 415      used with range-for, safely.  I.e., it is safe to delete the
 416      currently-iterated thread, like this:
 417
 418      for (thread_info *t : inf->threads_safe ())
 419        if (some_condition ())
 420          delete f;
 421   */
 422   inline safe_inf_threads_range threads_safe ()
 423   { return safe_inf_threads_range (this->thread_list); }
 424
 425   /* Continuations-related methods.  A continuation is an std::function
 426      to be called to finish the execution of a command when running
 427      GDB asynchronously.  A continuation is executed after any thread
 428      of this inferior stops.  Continuations are used by the attach
 429      command and the remote target when a new inferior is detected.  */
 430   void add_continuation (std::function<void ()> &&cont);
 431   void do_all_continuations ();
 432
 433   /* Set/get file name for default use for standard in/out in the
 434      inferior.  On Unix systems, we try to make TERMINAL_NAME the
 435      inferior's controlling terminal.  If TERMINAL_NAME is nullptr or
 436      the empty string, then the inferior inherits GDB's terminal (or
 437      GDBserver's if spawning a remote process).  */
 438   void set_tty (const char *terminal_name);
 439   const char *tty ();
 440
 441   /* Convenient handle (GDB inferior id).  Unique across all
 442      inferiors.  */
 443   int num = 0;
 444
 445   /* Actual target inferior id, usually, a process id.  This matches
 446      the ptid_t.pid member of threads of this inferior.  */
 447   int pid = 0;
 448   /* True if the PID was actually faked by GDB.  */
 449   bool fake_pid_p = false;
 450
 451   /* The highest thread number this inferior ever had.  */
 452   int highest_thread_num = 0;
 453
 454   /* State of GDB control of inferior process execution.
 455      See `struct inferior_control_state'.  */
 456   inferior_control_state control;
 457
 458   /* True if this was an auto-created inferior, e.g. created from
 459      following a fork; false, if this inferior was manually added by
 460      the user, and we should not attempt to prune it
 461      automatically.  */
 462   bool removable = false;
 463
 464   /* The address space bound to this inferior.  */
 465   struct address_space *aspace = NULL;
 466
 467   /* The program space bound to this inferior.  */
 468   struct program_space *pspace = NULL;
 469
 470   /* The arguments string to use when running.  */
 471   gdb::unique_xmalloc_ptr<char> args;
 472
 473   /* The size of elements in argv.  */
 474   int argc = 0;
 475
 476   /* The vector version of arguments.  If ARGC is nonzero,
 477      then we must compute ARGS from this (via the target).
 478      This is always coming from main's argv and therefore
 479      should never be freed.  */
 480   char **argv = NULL;
 481
 482   /* The current working directory that will be used when starting
 483      this inferior.  */
 484   gdb::unique_xmalloc_ptr<char> cwd;
 485
 486   /* The terminal state as set by the last target_terminal::terminal_*
 487      call.  */
 488   target_terminal_state terminal_state = target_terminal_state::is_ours;
 489
 490   /* Environment to use for running inferior,
 491      in format described in environ.h.  */
 492   gdb_environ environment;
 493
 494   /* True if this child process was attached rather than forked.  */
 495   bool attach_flag = false;
 496
 497   /* If this inferior is a vfork child, then this is the pointer to
 498      its vfork parent, if GDB is still attached to it.  */
 499   inferior *vfork_parent = NULL;
 500
 501   /* If this process is a vfork parent, this is the pointer to the
 502      child.  Since a vfork parent is left frozen by the kernel until
 503      the child execs or exits, a process can only have one vfork child
 504      at a given time.  */
 505   inferior *vfork_child = NULL;
 506
 507   /* True if this inferior should be detached when it's vfork sibling
 508      exits or execs.  */
 509   bool pending_detach = false;
 510
 511   /* True if this inferior is a vfork parent waiting for a vfork child
 512      not under our control to be done with the shared memory region,
 513      either by exiting or execing.  */
 514   bool waiting_for_vfork_done = false;
 515
 516   /* True if we're in the process of detaching from this inferior.  */
 517   bool detaching = false;
 518
 519   /* True if setup_inferior wasn't called for this inferior yet.
 520      Until that is done, we must not access inferior memory or
 521      registers, as we haven't determined the target
 522      architecture/description.  */
 523   bool needs_setup = false;
 524
 525   /* True when we are reading the library list of the inferior during an
 526      attach or handling a fork child.  */
 527   bool in_initial_library_scan = false;
 528
 529   /* Private data used by the target vector implementation.  */
 530   std::unique_ptr<private_inferior> priv;
 531
 532   /* HAS_EXIT_CODE is true if the inferior exited with an exit code.
 533      In this case, the EXIT_CODE field is also valid.  */
 534   bool has_exit_code = false;
 535   LONGEST exit_code = 0;
 536
 537   /* Default flags to pass to the symbol reading functions.  These are
 538      used whenever a new objfile is created.  */
 539   symfile_add_flags symfile_flags = 0;
 540
 541   /* Info about an inferior's target description (if it's fetched; the
 542      user supplied description's filename, if any; etc.).  */
 543   target_desc_info *tdesc_info = NULL;
 544
 545   /* The architecture associated with the inferior through the
 546      connection to the target.
 547
 548      The architecture vector provides some information that is really
 549      a property of the inferior, accessed through a particular target:
 550      ptrace operations; the layout of certain RSP packets; the
 551      solib_ops vector; etc.  To differentiate architecture accesses to
 552      per-inferior/target properties from
 553      per-thread/per-frame/per-objfile properties, accesses to
 554      per-inferior/target properties should be made through
 555      this gdbarch.  */
 556   struct gdbarch *gdbarch = NULL;
 557
 558   /* Data related to displaced stepping.  */
 559   displaced_step_inferior_state displaced_step_state;
 560
 561   /* Per inferior data-pointers required by other GDB modules.  */
 562   REGISTRY_FIELDS;
 563
 564 private:
 565   /* The inferior's target stack.  */
 566   target_stack m_target_stack;
 567
 568   /* The name of terminal device to use for I/O.  */
 569   gdb::unique_xmalloc_ptr<char> m_terminal;
 570
 571   /* The list of continuations.  */
 572   std::list<std::function<void ()>> m_continuations;
 573 };
 574
 575 /* Keep a registry of per-inferior data-pointers required by other GDB
 576    modules.  */
 577
 578 DECLARE_REGISTRY (inferior);
 579
 580 /* Add an inferior to the inferior list, print a message that a new
 581    inferior is found, and return the pointer to the new inferior.
 582    Caller may use this pointer to initialize the private inferior
 583    data.  */
 584 extern struct inferior *add_inferior (int pid);
 585
 586 /* Same as add_inferior, but don't print new inferior notifications to
 587    the CLI.  */
 588 extern struct inferior *add_inferior_silent (int pid);
 589
 590 extern void delete_inferior (struct inferior *todel);
 591
 592 /* Delete an existing inferior list entry, due to inferior detaching.  */
 593 extern void detach_inferior (inferior *inf);
 594
 595 extern void exit_inferior (inferior *inf);
 596
 597 extern void exit_inferior_silent (inferior *inf);
 598
 599 extern void exit_inferior_num_silent (int num);
 600
 601 extern void inferior_appeared (struct inferior *inf, int pid);
 602
 603 /* Search function to lookup an inferior of TARG by target 'pid'.  */
 604 extern struct inferior *find_inferior_pid (process_stratum_target *targ,
 605                                            int pid);
 606
 607 /* Search function to lookup an inferior of TARG whose pid is equal to
 608    'ptid.pid'. */
 609 extern struct inferior *find_inferior_ptid (process_stratum_target *targ,
 610                                             ptid_t ptid);
 611
 612 /* Search function to lookup an inferior by GDB 'num'.  */
 613 extern struct inferior *find_inferior_id (int num);
 614
 615 /* Find an inferior bound to PSPACE, giving preference to the current
 616    inferior.  */
 617 extern struct inferior *
 618   find_inferior_for_program_space (struct program_space *pspace);
 619
 620 /* Returns true if the inferior list is not empty.  */
 621 extern int have_inferiors (void);
 622
 623 /* Returns the number of live inferiors running on PROC_TARGET (real
 624    live processes with execution).  */
 625 extern int number_of_live_inferiors (process_stratum_target *proc_target);
 626
 627 /* Returns true if there are any live inferiors in the inferior list
 628    (not cores, not executables, real live processes).  */
 629 extern int have_live_inferiors (void);
 630
 631 /* Save/restore the current inferior.  */
 632
 633 class scoped_restore_current_inferior
 634 {
 635 public:
 636   scoped_restore_current_inferior ()
 637     : m_saved_inf (current_inferior ())
 638   {}
 639
 640   ~scoped_restore_current_inferior ()
 641   { set_current_inferior (m_saved_inf); }
 642
 643   DISABLE_COPY_AND_ASSIGN (scoped_restore_current_inferior);
 644
 645 private:
 646   inferior *m_saved_inf;
 647 };
 648
 649
 650 /* Traverse all inferiors.  */
 651
 652 extern struct inferior *inferior_list;
 653
 654 /* Pull in the internals of the inferiors ranges and iterators.  Must
 655    be done after struct inferior is defined.  */
 656 #include "inferior-iter.h"
 657
 658 /* Return a range that can be used to walk over all inferiors
 659    inferiors, with range-for, safely.  I.e., it is safe to delete the
 660    currently-iterated inferior.  When combined with range-for, this
 661    allow convenient patterns like this:
 662
 663      for (inferior *inf : all_inferiors_safe ())
 664        if (some_condition ())
 665          delete inf;
 666 */
 667
 668 inline all_inferiors_safe_range
 669 all_inferiors_safe ()
 670 {
 671   return {};
 672 }
 673
 674 /* Returns a range representing all inferiors, suitable to use with
 675    range-for, like this:
 676
 677    for (inferior *inf : all_inferiors ())
 678      [...]
 679 */
 680
 681 inline all_inferiors_range
 682 all_inferiors (process_stratum_target *proc_target = nullptr)
 683 {
 684   return all_inferiors_range (proc_target);
 685 }
 686
 687 /* Return a range that can be used to walk over all inferiors with PID
 688    not zero, with range-for.  */
 689
 690 inline all_non_exited_inferiors_range
 691 all_non_exited_inferiors (process_stratum_target *proc_target = nullptr)
 692 {
 693   return all_non_exited_inferiors_range (proc_target);
 694 }
 695
 696 /* Prune away automatically added inferiors that aren't required
 697    anymore.  */
 698 extern void prune_inferiors (void);
 699
 700 extern int number_of_inferiors (void);
 701
 702 extern struct inferior *add_inferior_with_spaces (void);
 703
 704 /* Print the current selected inferior.  */
 705 extern void print_selected_inferior (struct ui_out *uiout);
 706
 707 #endif /* !defined (INFERIOR_H) */