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) 1986-2021 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 #include "gdbsupport/intrusive_list.h"
  59
  60 #include "gdbsupport/common-inferior.h"
  61 #include "gdbthread.h"
  62
  63 #include "process-stratum-target.h"
  64 #include "displaced-stepping.h"
  65
  66 #include <unordered_map>
  67
  68 struct infcall_suspend_state;
  69 struct infcall_control_state;
  70
  71 extern void restore_infcall_suspend_state (struct infcall_suspend_state *);
  72 extern void restore_infcall_control_state (struct infcall_control_state *);
  73
  74 /* A deleter for infcall_suspend_state that calls
  75    restore_infcall_suspend_state.  */
  76 struct infcall_suspend_state_deleter
  77 {
  78   void operator() (struct infcall_suspend_state *state) const
  79   {
  80     try
  81       {
  82         restore_infcall_suspend_state (state);
  83       }
  84     catch (const gdb_exception_error &e)
  85       {
  86         /* If we are restoring the inferior state due to an exception,
  87            some error message will be printed.  So, only warn the user
  88            when we cannot restore during normal execution.  */
  89         bool unwinding;
  90 #if __cpp_lib_uncaught_exceptions
  91         unwinding = std::uncaught_exceptions () > 0;
  92 #else
  93         unwinding = std::uncaught_exception ();
  94 #endif
  95         if (!unwinding)
  96           warning (_("Failed to restore inferior state: %s"), e.what ());
  97       }
  98   }
  99 };
 100
 101 /* A unique_ptr specialization for infcall_suspend_state.  */
 102 typedef std::unique_ptr<infcall_suspend_state, infcall_suspend_state_deleter>
 103     infcall_suspend_state_up;
 104
 105 extern infcall_suspend_state_up save_infcall_suspend_state ();
 106
 107 /* A deleter for infcall_control_state that calls
 108    restore_infcall_control_state.  */
 109 struct infcall_control_state_deleter
 110 {
 111   void operator() (struct infcall_control_state *state) const
 112   {
 113     restore_infcall_control_state (state);
 114   }
 115 };
 116
 117 /* A unique_ptr specialization for infcall_control_state.  */
 118 typedef std::unique_ptr<infcall_control_state, infcall_control_state_deleter>
 119     infcall_control_state_up;
 120
 121 extern infcall_control_state_up save_infcall_control_state ();
 122
 123 extern void discard_infcall_suspend_state (struct infcall_suspend_state *);
 124 extern void discard_infcall_control_state (struct infcall_control_state *);
 125
 126 extern readonly_detached_regcache *
 127   get_infcall_suspend_state_regcache (struct infcall_suspend_state *);
 128
 129 extern void set_sigint_trap (void);
 130
 131 extern void clear_sigint_trap (void);
 132
 133 /* Collected pid, tid, etc. of the debugged inferior.  When there's
 134    no inferior, inferior_ptid.pid () will be 0.  */
 135
 136 extern ptid_t inferior_ptid;
 137
 138 extern void generic_mourn_inferior (void);
 139
 140 extern CORE_ADDR unsigned_pointer_to_address (struct gdbarch *gdbarch,
 141                                               struct type *type,
 142                                               const gdb_byte *buf);
 143 extern void unsigned_address_to_pointer (struct gdbarch *gdbarch,
 144                                          struct type *type, gdb_byte *buf,
 145                                          CORE_ADDR addr);
 146 extern CORE_ADDR signed_pointer_to_address (struct gdbarch *gdbarch,
 147                                             struct type *type,
 148                                             const gdb_byte *buf);
 149 extern void address_to_signed_pointer (struct gdbarch *gdbarch,
 150                                        struct type *type, gdb_byte *buf,
 151                                        CORE_ADDR addr);
 152
 153 extern void reopen_exec_file (void);
 154
 155 /* From misc files */
 156
 157 extern void default_print_registers_info (struct gdbarch *gdbarch,
 158                                           struct ui_file *file,
 159                                           struct frame_info *frame,
 160                                           int regnum, int all);
 161
 162 /* Default implementation of gdbarch_print_float_info.  Print
 163    the values of all floating point registers.  */
 164
 165 extern void default_print_float_info (struct gdbarch *gdbarch,
 166                                       struct ui_file *file,
 167                                       struct frame_info *frame,
 168                                       const char *args);
 169
 170 extern void child_terminal_info (struct target_ops *self, const char *, int);
 171
 172 extern void child_terminal_ours (struct target_ops *self);
 173
 174 extern void child_terminal_ours_for_output (struct target_ops *self);
 175
 176 extern void child_terminal_inferior (struct target_ops *self);
 177
 178 extern void child_terminal_save_inferior (struct target_ops *self);
 179
 180 extern void child_terminal_init (struct target_ops *self);
 181
 182 extern void child_terminal_init_with_pgrp (int pgrp);
 183
 184 extern void child_pass_ctrlc (struct target_ops *self);
 185
 186 extern void child_interrupt (struct target_ops *self);
 187
 188 /* From fork-child.c */
 189
 190 /* Helper function to call STARTUP_INFERIOR with PID and NUM_TRAPS.
 191    This function already calls set_executing.  Return the ptid_t from
 192    STARTUP_INFERIOR.  */
 193 extern ptid_t gdb_startup_inferior (pid_t pid, int num_traps);
 194
 195 /* From infcmd.c */
 196
 197 /* Initial inferior setup.  Determines the exec file is not yet known,
 198    takes any necessary post-attaching actions, fetches the target
 199    description and syncs the shared library list.  */
 200
 201 extern void setup_inferior (int from_tty);
 202
 203 extern void post_create_inferior (int from_tty);
 204
 205 extern void attach_command (const char *, int);
 206
 207 extern const char *get_inferior_args (void);
 208
 209 extern void set_inferior_args (const char *);
 210
 211 extern void set_inferior_args_vector (int, char **);
 212
 213 extern void registers_info (const char *, int);
 214
 215 extern void continue_1 (int all_threads);
 216
 217 extern void interrupt_target_1 (bool all_threads);
 218
 219 using delete_longjmp_breakpoint_cleanup
 220   = FORWARD_SCOPE_EXIT (delete_longjmp_breakpoint);
 221
 222 extern void detach_command (const char *, int);
 223
 224 extern void notice_new_inferior (struct thread_info *, bool, int);
 225
 226 extern struct value *get_return_value (struct value *function,
 227                                        struct type *value_type);
 228
 229 /* Prepare for execution command.  TARGET is the target that will run
 230    the command.  BACKGROUND determines whether this is a foreground
 231    (synchronous) or background (asynchronous) command.  */
 232
 233 extern void prepare_execution_command (struct target_ops *target,
 234                                        int background);
 235
 236 /* Nonzero if stopped due to completion of a stack dummy routine.  */
 237
 238 extern enum stop_stack_kind stop_stack_dummy;
 239
 240 /* Nonzero if program stopped due to a random (unexpected) signal in
 241    inferior process.  */
 242
 243 extern int stopped_by_random_signal;
 244
 245 /* Print notices on inferior events (attach, detach, etc.), set with
 246    `set print inferior-events'.  */
 247 extern bool print_inferior_events;
 248
 249 /* Anything but NO_STOP_QUIETLY means we expect a trap and the caller
 250    will handle it themselves.  STOP_QUIETLY is used when running in
 251    the shell before the child program has been exec'd and when running
 252    through shared library loading.  STOP_QUIETLY_REMOTE is used when
 253    setting up a remote connection; it is like STOP_QUIETLY_NO_SIGSTOP
 254    except that there is no need to hide a signal.  */
 255
 256 /* STOP_QUIETLY_NO_SIGSTOP is used to handle a tricky situation with attach.
 257    When doing an attach, the kernel stops the debuggee with a SIGSTOP.
 258    On newer GNU/Linux kernels (>= 2.5.61) the handling of SIGSTOP for
 259    a ptraced process has changed.  Earlier versions of the kernel
 260    would ignore these SIGSTOPs, while now SIGSTOP is treated like any
 261    other signal, i.e. it is not muffled.
 262
 263    If the gdb user does a 'continue' after the 'attach', gdb passes
 264    the global variable stop_signal (which stores the signal from the
 265    attach, SIGSTOP) to the ptrace(PTRACE_CONT,...)  call.  This is
 266    problematic, because the kernel doesn't ignore such SIGSTOP
 267    now.  I.e. it is reported back to gdb, which in turn presents it
 268    back to the user.
 269
 270    To avoid the problem, we use STOP_QUIETLY_NO_SIGSTOP, which allows
 271    gdb to clear the value of stop_signal after the attach, so that it
 272    is not passed back down to the kernel.  */
 273
 274 enum stop_kind
 275   {
 276     NO_STOP_QUIETLY = 0,
 277     STOP_QUIETLY,
 278     STOP_QUIETLY_REMOTE,
 279     STOP_QUIETLY_NO_SIGSTOP
 280   };
 281
 282 \f
 283 /* Possible values for gdbarch_call_dummy_location.  */
 284 #define ON_STACK 1
 285 #define AT_ENTRY_POINT 4
 286
 287 /* Base class for target-specific inferior data.  */
 288
 289 struct private_inferior
 290 {
 291   virtual ~private_inferior () = 0;
 292 };
 293
 294 /* Inferior process specific part of `struct infcall_control_state'.
 295
 296    Inferior thread counterpart is `struct thread_control_state'.  */
 297
 298 struct inferior_control_state
 299 {
 300   inferior_control_state ()
 301     : stop_soon (NO_STOP_QUIETLY)
 302   {
 303   }
 304
 305   explicit inferior_control_state (enum stop_kind when)
 306     : stop_soon (when)
 307   {
 308   }
 309
 310   /* See the definition of stop_kind above.  */
 311   enum stop_kind stop_soon;
 312 };
 313
 314 /* Return a pointer to the current inferior.  */
 315 extern inferior *current_inferior ();
 316
 317 extern void set_current_inferior (inferior *);
 318
 319 /* Switch inferior (and program space) to INF, and switch to no thread
 320    selected.  */
 321 extern void switch_to_inferior_no_thread (inferior *inf);
 322
 323 /* GDB represents the state of each program execution with an object
 324    called an inferior.  An inferior typically corresponds to a process
 325    but is more general and applies also to targets that do not have a
 326    notion of processes.  Each run of an executable creates a new
 327    inferior, as does each attachment to an existing process.
 328    Inferiors have unique internal identifiers that are different from
 329    target process ids.  Each inferior may in turn have multiple
 330    threads running in it.
 331
 332    Inferiors are intrusively refcounted objects.  Unlike thread
 333    objects, being the user-selected inferior is considered a strong
 334    reference and is thus accounted for in the inferior object's
 335    refcount (see set_current_inferior).  When GDB needs to remember
 336    the selected inferior to later restore it, GDB temporarily bumps
 337    the inferior object's refcount, to prevent something deleting the
 338    inferior object before reverting back (e.g., due to a
 339    "remove-inferiors" command (see
 340    scoped_restore_current_inferior).  All other inferior
 341    references are considered weak references.  Inferiors are always
 342    listed exactly once in the inferior list, so placing an inferior in
 343    the inferior list is an implicit, not counted strong reference.  */
 344
 345 class inferior : public refcounted_object,
 346                  public intrusive_list_node<inferior>
 347 {
 348 public:
 349   explicit inferior (int pid);
 350   ~inferior ();
 351
 352   /* Returns true if we can delete this inferior.  */
 353   bool deletable () const { return refcount () == 0; }
 354
 355   /* Push T in this inferior's target stack.  */
 356   void push_target (struct target_ops *t)
 357   { m_target_stack.push (t); }
 358
 359   /* An overload that deletes the target on failure.  */
 360   void push_target (target_ops_up &&t)
 361   {
 362     m_target_stack.push (t.get ());
 363     t.release ();
 364   }
 365
 366   /* Unpush T from this inferior's target stack.  */
 367   int unpush_target (struct target_ops *t);
 368
 369   /* Returns true if T is pushed in this inferior's target stack.  */
 370   bool target_is_pushed (target_ops *t)
 371   { return m_target_stack.is_pushed (t); }
 372
 373   /* Find the target beneath T in this inferior's target stack.  */
 374   target_ops *find_target_beneath (const target_ops *t)
 375   { return m_target_stack.find_beneath (t); }
 376
 377   /* Return the target at the top of this inferior's target stack.  */
 378   target_ops *top_target ()
 379   { return m_target_stack.top (); }
 380
 381   /* Return the target at process_stratum level in this inferior's
 382      target stack.  */
 383   struct process_stratum_target *process_target ()
 384   { return (process_stratum_target *) m_target_stack.at (process_stratum); }
 385
 386   /* Return the target at STRATUM in this inferior's target stack.  */
 387   target_ops *target_at (enum strata stratum)
 388   { return m_target_stack.at (stratum); }
 389
 390   bool has_execution ()
 391   { return target_has_execution (this); }
 392
 393   /* This inferior's thread list, sorted by creation order.  */
 394   intrusive_list<thread_info> thread_list;
 395
 396   /* A map of ptid_t to thread_info*, for average O(1) ptid_t lookup.
 397      Exited threads do not appear in the map.  */
 398   std::unordered_map<ptid_t, thread_info *, hash_ptid> ptid_thread_map;
 399
 400   /* Returns a range adapter covering the inferior's threads,
 401      including exited threads.  Used like this:
 402
 403        for (thread_info *thr : inf->threads ())
 404          { .... }
 405   */
 406   inf_threads_range threads ()
 407   { return inf_threads_range (this->thread_list.begin ()); }
 408
 409   /* Returns a range adapter covering the inferior's non-exited
 410      threads.  Used like this:
 411
 412        for (thread_info *thr : inf->non_exited_threads ())
 413          { .... }
 414   */
 415   inf_non_exited_threads_range non_exited_threads ()
 416   { return inf_non_exited_threads_range (this->thread_list.begin ()); }
 417
 418   /* Like inferior::threads(), but returns a range adapter that can be
 419      used with range-for, safely.  I.e., it is safe to delete the
 420      currently-iterated thread, like this:
 421
 422      for (thread_info *t : inf->threads_safe ())
 423        if (some_condition ())
 424          delete f;
 425   */
 426   inline safe_inf_threads_range threads_safe ()
 427   { return safe_inf_threads_range (this->thread_list.begin ()); }
 428
 429   /* Delete all threads in the thread list.  If SILENT, exit threads
 430      silently.  */
 431   void clear_thread_list (bool silent);
 432
 433   /* Continuations-related methods.  A continuation is an std::function
 434      to be called to finish the execution of a command when running
 435      GDB asynchronously.  A continuation is executed after any thread
 436      of this inferior stops.  Continuations are used by the attach
 437      command and the remote target when a new inferior is detected.  */
 438   void add_continuation (std::function<void ()> &&cont);
 439   void do_all_continuations ();
 440
 441   /* Set/get file name for default use for standard in/out in the
 442      inferior.  On Unix systems, we try to make TERMINAL_NAME the
 443      inferior's controlling terminal.  If TERMINAL_NAME is nullptr or
 444      the empty string, then the inferior inherits GDB's terminal (or
 445      GDBserver's if spawning a remote process).  */
 446   void set_tty (const char *terminal_name);
 447   const char *tty ();
 448
 449   /* Convenient handle (GDB inferior id).  Unique across all
 450      inferiors.  */
 451   int num = 0;
 452
 453   /* Actual target inferior id, usually, a process id.  This matches
 454      the ptid_t.pid member of threads of this inferior.  */
 455   int pid = 0;
 456   /* True if the PID was actually faked by GDB.  */
 457   bool fake_pid_p = false;
 458
 459   /* The highest thread number this inferior ever had.  */
 460   int highest_thread_num = 0;
 461
 462   /* State of GDB control of inferior process execution.
 463      See `struct inferior_control_state'.  */
 464   inferior_control_state control;
 465
 466   /* True if this was an auto-created inferior, e.g. created from
 467      following a fork; false, if this inferior was manually added by
 468      the user, and we should not attempt to prune it
 469      automatically.  */
 470   bool removable = false;
 471
 472   /* The address space bound to this inferior.  */
 473   struct address_space *aspace = NULL;
 474
 475   /* The program space bound to this inferior.  */
 476   struct program_space *pspace = NULL;
 477
 478   /* The arguments string to use when running.  */
 479   gdb::unique_xmalloc_ptr<char> args;
 480
 481   /* The current working directory that will be used when starting
 482      this inferior.  */
 483   gdb::unique_xmalloc_ptr<char> cwd;
 484
 485   /* The terminal state as set by the last target_terminal::terminal_*
 486      call.  */
 487   target_terminal_state terminal_state = target_terminal_state::is_ours;
 488
 489   /* Environment to use for running inferior,
 490      in format described in environ.h.  */
 491   gdb_environ environment;
 492
 493   /* True if this child process was attached rather than forked.  */
 494   bool attach_flag = false;
 495
 496   /* If this inferior is a vfork child, then this is the pointer to
 497      its vfork parent, if GDB is still attached to it.  */
 498   inferior *vfork_parent = NULL;
 499
 500   /* If this process is a vfork parent, this is the pointer to the
 501      child.  Since a vfork parent is left frozen by the kernel until
 502      the child execs or exits, a process can only have one vfork child
 503      at a given time.  */
 504   inferior *vfork_child = NULL;
 505
 506   /* True if this inferior should be detached when it's vfork sibling
 507      exits or execs.  */
 508   bool pending_detach = false;
 509
 510   /* True if this inferior is a vfork parent waiting for a vfork child
 511      not under our control to be done with the shared memory region,
 512      either by exiting or execing.  */
 513   bool waiting_for_vfork_done = false;
 514
 515   /* True if we're in the process of detaching from this inferior.  */
 516   bool detaching = false;
 517
 518   /* True if setup_inferior wasn't called for this inferior yet.
 519      Until that is done, we must not access inferior memory or
 520      registers, as we haven't determined the target
 521      architecture/description.  */
 522   bool needs_setup = false;
 523
 524   /* True when we are reading the library list of the inferior during an
 525      attach or handling a fork child.  */
 526   bool in_initial_library_scan = false;
 527
 528   /* Private data used by the target vector implementation.  */
 529   std::unique_ptr<private_inferior> priv;
 530
 531   /* HAS_EXIT_CODE is true if the inferior exited with an exit code.
 532      In this case, the EXIT_CODE field is also valid.  */
 533   bool has_exit_code = false;
 534   LONGEST exit_code = 0;
 535
 536   /* Default flags to pass to the symbol reading functions.  These are
 537      used whenever a new objfile is created.  */
 538   symfile_add_flags symfile_flags = 0;
 539
 540   /* Info about an inferior's target description (if it's fetched; the
 541      user supplied description's filename, if any; etc.).  */
 542   target_desc_info *tdesc_info = NULL;
 543
 544   /* The architecture associated with the inferior through the
 545      connection to the target.
 546
 547      The architecture vector provides some information that is really
 548      a property of the inferior, accessed through a particular target:
 549      ptrace operations; the layout of certain RSP packets; the
 550      solib_ops vector; etc.  To differentiate architecture accesses to
 551      per-inferior/target properties from
 552      per-thread/per-frame/per-objfile properties, accesses to
 553      per-inferior/target properties should be made through
 554      this gdbarch.  */
 555   struct gdbarch *gdbarch = NULL;
 556
 557   /* Data related to displaced stepping.  */
 558   displaced_step_inferior_state displaced_step_state;
 559
 560   /* Per inferior data-pointers required by other GDB modules.  */
 561   REGISTRY_FIELDS;
 562
 563 private:
 564   /* The inferior's target stack.  */
 565   target_stack m_target_stack;
 566
 567   /* The name of terminal device to use for I/O.  */
 568   gdb::unique_xmalloc_ptr<char> m_terminal;
 569
 570   /* The list of continuations.  */
 571   std::list<std::function<void ()>> m_continuations;
 572 };
 573
 574 /* Keep a registry of per-inferior data-pointers required by other GDB
 575    modules.  */
 576
 577 DECLARE_REGISTRY (inferior);
 578
 579 /* Add an inferior to the inferior list, print a message that a new
 580    inferior is found, and return the pointer to the new inferior.
 581    Caller may use this pointer to initialize the private inferior
 582    data.  */
 583 extern struct inferior *add_inferior (int pid);
 584
 585 /* Same as add_inferior, but don't print new inferior notifications to
 586    the CLI.  */
 587 extern struct inferior *add_inferior_silent (int pid);
 588
 589 extern void delete_inferior (struct inferior *todel);
 590
 591 /* Delete an existing inferior list entry, due to inferior detaching.  */
 592 extern void detach_inferior (inferior *inf);
 593
 594 extern void exit_inferior (inferior *inf);
 595
 596 extern void exit_inferior_silent (inferior *inf);
 597
 598 extern void exit_inferior_num_silent (int num);
 599
 600 extern void inferior_appeared (struct inferior *inf, int pid);
 601
 602 /* Search function to lookup an inferior of TARG by target 'pid'.  */
 603 extern struct inferior *find_inferior_pid (process_stratum_target *targ,
 604                                            int pid);
 605
 606 /* Search function to lookup an inferior of TARG whose pid is equal to
 607    'ptid.pid'. */
 608 extern struct inferior *find_inferior_ptid (process_stratum_target *targ,
 609                                             ptid_t ptid);
 610
 611 /* Search function to lookup an inferior by GDB 'num'.  */
 612 extern struct inferior *find_inferior_id (int num);
 613
 614 /* Find an inferior bound to PSPACE, giving preference to the current
 615    inferior.  */
 616 extern struct inferior *
 617   find_inferior_for_program_space (struct program_space *pspace);
 618
 619 /* Returns true if the inferior list is not empty.  */
 620 extern int have_inferiors (void);
 621
 622 /* Returns the number of live inferiors running on PROC_TARGET (real
 623    live processes with execution).  */
 624 extern int number_of_live_inferiors (process_stratum_target *proc_target);
 625
 626 /* Returns true if there are any live inferiors in the inferior list
 627    (not cores, not executables, real live processes).  */
 628 extern int have_live_inferiors (void);
 629
 630 /* Save/restore the current inferior.  */
 631
 632 class scoped_restore_current_inferior
 633 {
 634 public:
 635   scoped_restore_current_inferior ()
 636     : m_saved_inf (current_inferior ())
 637   {}
 638
 639   ~scoped_restore_current_inferior ()
 640   { set_current_inferior (m_saved_inf); }
 641
 642   DISABLE_COPY_AND_ASSIGN (scoped_restore_current_inferior);
 643
 644 private:
 645   inferior *m_saved_inf;
 646 };
 647
 648
 649 /* Traverse all inferiors.  */
 650
 651 extern intrusive_list<inferior> inferior_list;
 652
 653 /* Pull in the internals of the inferiors ranges and iterators.  Must
 654    be done after struct inferior is defined.  */
 655 #include "inferior-iter.h"
 656
 657 /* Return a range that can be used to walk over all inferiors
 658    inferiors, with range-for, safely.  I.e., it is safe to delete the
 659    currently-iterated inferior.  When combined with range-for, this
 660    allow convenient patterns like this:
 661
 662      for (inferior *inf : all_inferiors_safe ())
 663        if (some_condition ())
 664          delete inf;
 665 */
 666
 667 inline all_inferiors_safe_range
 668 all_inferiors_safe ()
 669 {
 670   return all_inferiors_safe_range (nullptr, inferior_list);
 671 }
 672
 673 /* Returns a range representing all inferiors, suitable to use with
 674    range-for, like this:
 675
 676    for (inferior *inf : all_inferiors ())
 677      [...]
 678 */
 679
 680 inline all_inferiors_range
 681 all_inferiors (process_stratum_target *proc_target = nullptr)
 682 {
 683   return all_inferiors_range (proc_target, inferior_list);
 684 }
 685
 686 /* Return a range that can be used to walk over all inferiors with PID
 687    not zero, with range-for.  */
 688
 689 inline all_non_exited_inferiors_range
 690 all_non_exited_inferiors (process_stratum_target *proc_target = nullptr)
 691 {
 692   return all_non_exited_inferiors_range (proc_target, inferior_list);
 693 }
 694
 695 /* Prune away automatically added inferiors that aren't required
 696    anymore.  */
 697 extern void prune_inferiors (void);
 698
 699 extern int number_of_inferiors (void);
 700
 701 extern struct inferior *add_inferior_with_spaces (void);
 702
 703 /* Print the current selected inferior.  */
 704 extern void print_selected_inferior (struct ui_out *uiout);
 705
 706 #endif /* !defined (INFERIOR_H) */