1 /* Variables that describe the inferior process running under GDB:
2 Where it is, why it stopped, and how to step it.
4 Copyright (C) 1986-2020 Free Software Foundation, Inc.
6 This file is part of GDB.
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.
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.
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/>. */
21 #if !defined (INFERIOR_H)
24 struct target_waitstatus
;
32 struct target_desc_info
;
38 #include "breakpoint.h"
40 /* For enum gdb_signal. */
43 /* For struct frame_id. */
46 /* For gdb_environ. */
47 #include "gdbsupport/environ.h"
49 #include "progspace.h"
52 #include "symfile-add-flags.h"
53 #include "gdbsupport/refcounted-object.h"
54 #include "gdbsupport/forward-scope-exit.h"
56 #include "gdbsupport/common-inferior.h"
57 #include "gdbthread.h"
59 struct infcall_suspend_state
;
60 struct infcall_control_state
;
62 extern void restore_infcall_suspend_state (struct infcall_suspend_state
*);
63 extern void restore_infcall_control_state (struct infcall_control_state
*);
65 /* A deleter for infcall_suspend_state that calls
66 restore_infcall_suspend_state. */
67 struct infcall_suspend_state_deleter
69 void operator() (struct infcall_suspend_state
*state
) const
73 restore_infcall_suspend_state (state
);
75 catch (const gdb_exception_error
&e
)
77 /* If we are restoring the inferior state due to an exception,
78 some error message will be printed. So, only warn the user
79 when we cannot restore during normal execution. */
80 if (!std::uncaught_exception ())
81 warning (_("Failed to restore inferior state: %s"), e
.what ());
86 /* A unique_ptr specialization for infcall_suspend_state. */
87 typedef std::unique_ptr
<infcall_suspend_state
, infcall_suspend_state_deleter
>
88 infcall_suspend_state_up
;
90 extern infcall_suspend_state_up
save_infcall_suspend_state ();
92 /* A deleter for infcall_control_state that calls
93 restore_infcall_control_state. */
94 struct infcall_control_state_deleter
96 void operator() (struct infcall_control_state
*state
) const
98 restore_infcall_control_state (state
);
102 /* A unique_ptr specialization for infcall_control_state. */
103 typedef std::unique_ptr
<infcall_control_state
, infcall_control_state_deleter
>
104 infcall_control_state_up
;
106 extern infcall_control_state_up
save_infcall_control_state ();
108 extern void discard_infcall_suspend_state (struct infcall_suspend_state
*);
109 extern void discard_infcall_control_state (struct infcall_control_state
*);
111 extern readonly_detached_regcache
*
112 get_infcall_suspend_state_regcache (struct infcall_suspend_state
*);
114 extern void set_sigint_trap (void);
116 extern void clear_sigint_trap (void);
118 /* Set/get file name for default use for standard in/out in the inferior. */
120 extern void set_inferior_io_terminal (const char *terminal_name
);
121 extern const char *get_inferior_io_terminal (void);
123 /* Collected pid, tid, etc. of the debugged inferior. When there's
124 no inferior, inferior_ptid.pid () will be 0. */
126 extern ptid_t inferior_ptid
;
128 extern void generic_mourn_inferior (void);
130 extern CORE_ADDR
unsigned_pointer_to_address (struct gdbarch
*gdbarch
,
132 const gdb_byte
*buf
);
133 extern void unsigned_address_to_pointer (struct gdbarch
*gdbarch
,
134 struct type
*type
, gdb_byte
*buf
,
136 extern CORE_ADDR
signed_pointer_to_address (struct gdbarch
*gdbarch
,
138 const gdb_byte
*buf
);
139 extern void address_to_signed_pointer (struct gdbarch
*gdbarch
,
140 struct type
*type
, gdb_byte
*buf
,
143 extern void reopen_exec_file (void);
145 /* From misc files */
147 extern void default_print_registers_info (struct gdbarch
*gdbarch
,
148 struct ui_file
*file
,
149 struct frame_info
*frame
,
150 int regnum
, int all
);
152 /* Default implementation of gdbarch_print_float_info. Print
153 the values of all floating point registers. */
155 extern void default_print_float_info (struct gdbarch
*gdbarch
,
156 struct ui_file
*file
,
157 struct frame_info
*frame
,
160 extern void child_terminal_info (struct target_ops
*self
, const char *, int);
162 extern void child_terminal_ours (struct target_ops
*self
);
164 extern void child_terminal_ours_for_output (struct target_ops
*self
);
166 extern void child_terminal_inferior (struct target_ops
*self
);
168 extern void child_terminal_save_inferior (struct target_ops
*self
);
170 extern void child_terminal_init (struct target_ops
*self
);
172 extern void child_terminal_init_with_pgrp (int pgrp
);
174 extern void child_pass_ctrlc (struct target_ops
*self
);
176 extern void child_interrupt (struct target_ops
*self
);
178 /* From fork-child.c */
180 /* Helper function to call STARTUP_INFERIOR with PID and NUM_TRAPS.
181 This function already calls set_executing. Return the ptid_t from
183 extern ptid_t
gdb_startup_inferior (pid_t pid
, int num_traps
);
185 extern char *construct_inferior_arguments (int, char **);
189 /* Initial inferior setup. Determines the exec file is not yet known,
190 takes any necessary post-attaching actions, fetches the target
191 description and syncs the shared library list. */
193 extern void setup_inferior (int from_tty
);
195 extern void post_create_inferior (struct target_ops
*, int);
197 extern void attach_command (const char *, int);
199 extern const char *get_inferior_args (void);
201 extern void set_inferior_args (const char *);
203 extern void set_inferior_args_vector (int, char **);
205 extern void registers_info (const char *, int);
207 extern void continue_1 (int all_threads
);
209 extern void interrupt_target_1 (int all_threads
);
211 using delete_longjmp_breakpoint_cleanup
212 = FORWARD_SCOPE_EXIT (delete_longjmp_breakpoint
);
214 extern void detach_command (const char *, int);
216 extern void notice_new_inferior (struct thread_info
*, int, int);
218 extern struct value
*get_return_value (struct value
*function
,
219 struct type
*value_type
);
221 /* Prepare for execution command. TARGET is the target that will run
222 the command. BACKGROUND determines whether this is a foreground
223 (synchronous) or background (asynchronous) command. */
225 extern void prepare_execution_command (struct target_ops
*target
,
228 /* Nonzero if stopped due to completion of a stack dummy routine. */
230 extern enum stop_stack_kind stop_stack_dummy
;
232 /* Nonzero if program stopped due to a random (unexpected) signal in
235 extern int stopped_by_random_signal
;
237 /* Print notices on inferior events (attach, detach, etc.), set with
238 `set print inferior-events'. */
239 extern bool print_inferior_events
;
241 /* Anything but NO_STOP_QUIETLY means we expect a trap and the caller
242 will handle it themselves. STOP_QUIETLY is used when running in
243 the shell before the child program has been exec'd and when running
244 through shared library loading. STOP_QUIETLY_REMOTE is used when
245 setting up a remote connection; it is like STOP_QUIETLY_NO_SIGSTOP
246 except that there is no need to hide a signal. */
248 /* STOP_QUIETLY_NO_SIGSTOP is used to handle a tricky situation with attach.
249 When doing an attach, the kernel stops the debuggee with a SIGSTOP.
250 On newer GNU/Linux kernels (>= 2.5.61) the handling of SIGSTOP for
251 a ptraced process has changed. Earlier versions of the kernel
252 would ignore these SIGSTOPs, while now SIGSTOP is treated like any
253 other signal, i.e. it is not muffled.
255 If the gdb user does a 'continue' after the 'attach', gdb passes
256 the global variable stop_signal (which stores the signal from the
257 attach, SIGSTOP) to the ptrace(PTRACE_CONT,...) call. This is
258 problematic, because the kernel doesn't ignore such SIGSTOP
259 now. I.e. it is reported back to gdb, which in turn presents it
262 To avoid the problem, we use STOP_QUIETLY_NO_SIGSTOP, which allows
263 gdb to clear the value of stop_signal after the attach, so that it
264 is not passed back down to the kernel. */
271 STOP_QUIETLY_NO_SIGSTOP
275 /* Possible values for gdbarch_call_dummy_location. */
277 #define AT_ENTRY_POINT 4
279 /* Base class for target-specific inferior data. */
281 struct private_inferior
283 virtual ~private_inferior () = 0;
286 /* Inferior process specific part of `struct infcall_control_state'.
288 Inferior thread counterpart is `struct thread_control_state'. */
290 struct inferior_control_state
292 inferior_control_state ()
293 : stop_soon (NO_STOP_QUIETLY
)
297 explicit inferior_control_state (enum stop_kind when
)
302 /* See the definition of stop_kind above. */
303 enum stop_kind stop_soon
;
306 /* Return a pointer to the current inferior. */
307 extern inferior
*current_inferior ();
309 extern void set_current_inferior (inferior
*);
311 /* Switch inferior (and program space) to INF, and switch to no thread
313 extern void switch_to_inferior_no_thread (inferior
*inf
);
315 /* GDB represents the state of each program execution with an object
316 called an inferior. An inferior typically corresponds to a process
317 but is more general and applies also to targets that do not have a
318 notion of processes. Each run of an executable creates a new
319 inferior, as does each attachment to an existing process.
320 Inferiors have unique internal identifiers that are different from
321 target process ids. Each inferior may in turn have multiple
322 threads running in it.
324 Inferiors are intrusively refcounted objects. Unlike thread
325 objects, being the user-selected inferior is considered a strong
326 reference and is thus accounted for in the inferior object's
327 refcount (see set_current_inferior). When GDB needs to remember
328 the selected inferior to later restore it, GDB temporarily bumps
329 the inferior object's refcount, to prevent something deleting the
330 inferior object before reverting back (e.g., due to a
331 "remove-inferiors" command (see
332 scoped_restore_current_inferior). All other inferior
333 references are considered weak references. Inferiors are always
334 listed exactly once in the inferior list, so placing an inferior in
335 the inferior list is an implicit, not counted strong reference. */
337 class inferior
: public refcounted_object
340 explicit inferior (int pid
);
343 /* Returns true if we can delete this inferior. */
344 bool deletable () const { return refcount () == 0; }
346 bool has_execution ()
347 { return target_has_execution_1 (this); }
349 /* Pointer to next inferior in singly-linked list of inferiors. */
350 struct inferior
*next
= NULL
;
352 /* This inferior's thread list. */
353 thread_info
*thread_list
= nullptr;
355 /* Returns a range adapter covering the inferior's threads,
356 including exited threads. Used like this:
358 for (thread_info *thr : inf->threads ())
361 inf_threads_range
threads ()
362 { return inf_threads_range (this->thread_list
); }
364 /* Returns a range adapter covering the inferior's non-exited
365 threads. Used like this:
367 for (thread_info *thr : inf->non_exited_threads ())
370 inf_non_exited_threads_range
non_exited_threads ()
371 { return inf_non_exited_threads_range (this->thread_list
); }
373 /* Like inferior::threads(), but returns a range adapter that can be
374 used with range-for, safely. I.e., it is safe to delete the
375 currently-iterated thread, like this:
377 for (thread_info *t : inf->threads_safe ())
378 if (some_condition ())
381 inline safe_inf_threads_range
threads_safe ()
382 { return safe_inf_threads_range (this->thread_list
); }
384 /* Convenient handle (GDB inferior id). Unique across all
388 /* Actual target inferior id, usually, a process id. This matches
389 the ptid_t.pid member of threads of this inferior. */
391 /* True if the PID was actually faked by GDB. */
392 bool fake_pid_p
= false;
394 /* The highest thread number this inferior ever had. */
395 int highest_thread_num
= 0;
397 /* State of GDB control of inferior process execution.
398 See `struct inferior_control_state'. */
399 inferior_control_state control
;
401 /* True if this was an auto-created inferior, e.g. created from
402 following a fork; false, if this inferior was manually added by
403 the user, and we should not attempt to prune it
405 bool removable
= false;
407 /* The address space bound to this inferior. */
408 struct address_space
*aspace
= NULL
;
410 /* The program space bound to this inferior. */
411 struct program_space
*pspace
= NULL
;
413 /* The arguments string to use when running. */
416 /* The size of elements in argv. */
419 /* The vector version of arguments. If ARGC is nonzero,
420 then we must compute ARGS from this (via the target).
421 This is always coming from main's argv and therefore
422 should never be freed. */
425 /* The current working directory that will be used when starting
427 gdb::unique_xmalloc_ptr
<char> cwd
;
429 /* The name of terminal device to use for I/O. */
430 char *terminal
= NULL
;
432 /* The terminal state as set by the last target_terminal::terminal_*
434 target_terminal_state terminal_state
= target_terminal_state::is_ours
;
436 /* Environment to use for running inferior,
437 in format described in environ.h. */
438 gdb_environ environment
;
440 /* True if this child process was attached rather than forked. */
441 bool attach_flag
= false;
443 /* If this inferior is a vfork child, then this is the pointer to
444 its vfork parent, if GDB is still attached to it. */
445 inferior
*vfork_parent
= NULL
;
447 /* If this process is a vfork parent, this is the pointer to the
448 child. Since a vfork parent is left frozen by the kernel until
449 the child execs or exits, a process can only have one vfork child
451 inferior
*vfork_child
= NULL
;
453 /* True if this inferior should be detached when it's vfork sibling
455 bool pending_detach
= false;
457 /* True if this inferior is a vfork parent waiting for a vfork child
458 not under our control to be done with the shared memory region,
459 either by exiting or execing. */
460 bool waiting_for_vfork_done
= false;
462 /* True if we're in the process of detaching from this inferior. */
463 bool detaching
= false;
465 /* What is left to do for an execution command after any thread of
466 this inferior stops. For continuations associated with a
467 specific thread, see `struct thread_info'. */
468 continuation
*continuations
= NULL
;
470 /* True if setup_inferior wasn't called for this inferior yet.
471 Until that is done, we must not access inferior memory or
472 registers, as we haven't determined the target
473 architecture/description. */
474 bool needs_setup
= false;
476 /* Private data used by the target vector implementation. */
477 std::unique_ptr
<private_inferior
> priv
;
479 /* HAS_EXIT_CODE is true if the inferior exited with an exit code.
480 In this case, the EXIT_CODE field is also valid. */
481 bool has_exit_code
= false;
482 LONGEST exit_code
= 0;
484 /* Default flags to pass to the symbol reading functions. These are
485 used whenever a new objfile is created. */
486 symfile_add_flags symfile_flags
= 0;
488 /* Info about an inferior's target description (if it's fetched; the
489 user supplied description's filename, if any; etc.). */
490 target_desc_info
*tdesc_info
= NULL
;
492 /* The architecture associated with the inferior through the
493 connection to the target.
495 The architecture vector provides some information that is really
496 a property of the inferior, accessed through a particular target:
497 ptrace operations; the layout of certain RSP packets; the
498 solib_ops vector; etc. To differentiate architecture accesses to
499 per-inferior/target properties from
500 per-thread/per-frame/per-objfile properties, accesses to
501 per-inferior/target properties should be made through
503 struct gdbarch
*gdbarch
= NULL
;
505 /* Data related to displaced stepping. */
506 displaced_step_inferior_state displaced_step_state
;
508 /* Per inferior data-pointers required by other GDB modules. */
512 /* Keep a registry of per-inferior data-pointers required by other GDB
515 DECLARE_REGISTRY (inferior
);
517 /* Add an inferior to the inferior list, print a message that a new
518 inferior is found, and return the pointer to the new inferior.
519 Caller may use this pointer to initialize the private inferior
521 extern struct inferior
*add_inferior (int pid
);
523 /* Same as add_inferior, but don't print new inferior notifications to
525 extern struct inferior
*add_inferior_silent (int pid
);
527 extern void delete_inferior (struct inferior
*todel
);
529 /* Delete an existing inferior list entry, due to inferior detaching. */
530 extern void detach_inferior (inferior
*inf
);
532 extern void exit_inferior (inferior
*inf
);
534 extern void exit_inferior_silent (inferior
*inf
);
536 extern void exit_inferior_num_silent (int num
);
538 extern void inferior_appeared (struct inferior
*inf
, int pid
);
540 /* Get rid of all inferiors. */
541 extern void discard_all_inferiors (void);
543 /* Search function to lookup an inferior by target 'pid'. */
544 extern struct inferior
*find_inferior_pid (int pid
);
546 /* Search function to lookup an inferior whose pid is equal to 'ptid.pid'. */
547 extern struct inferior
*find_inferior_ptid (ptid_t ptid
);
549 /* Search function to lookup an inferior by GDB 'num'. */
550 extern struct inferior
*find_inferior_id (int num
);
552 /* Find an inferior bound to PSPACE, giving preference to the current
554 extern struct inferior
*
555 find_inferior_for_program_space (struct program_space
*pspace
);
557 /* Inferior iterator function.
559 Calls a callback function once for each inferior, so long as the
560 callback function returns false. If the callback function returns
561 true, the iteration will end and the current inferior will be
562 returned. This can be useful for implementing a search for a
563 inferior with arbitrary attributes, or for applying some operation
566 It is safe to delete the iterated inferior from the callback. */
567 extern struct inferior
*iterate_over_inferiors (int (*) (struct inferior
*,
571 /* Returns true if the inferior list is not empty. */
572 extern int have_inferiors (void);
574 /* Returns the number of live inferiors (real live processes). */
575 extern int number_of_live_inferiors (void);
577 /* Returns true if there are any live inferiors in the inferior list
578 (not cores, not executables, real live processes). */
579 extern int have_live_inferiors (void);
581 /* Save/restore the current inferior. */
583 class scoped_restore_current_inferior
586 scoped_restore_current_inferior ()
587 : m_saved_inf (current_inferior ())
590 ~scoped_restore_current_inferior ()
591 { set_current_inferior (m_saved_inf
); }
593 DISABLE_COPY_AND_ASSIGN (scoped_restore_current_inferior
);
596 inferior
*m_saved_inf
;
600 /* Traverse all inferiors. */
602 extern struct inferior
*inferior_list
;
604 /* Pull in the internals of the inferiors ranges and iterators. Must
605 be done after struct inferior is defined. */
606 #include "inferior-iter.h"
608 /* Return a range that can be used to walk over all inferiors
609 inferiors, with range-for, safely. I.e., it is safe to delete the
610 currently-iterated inferior. When combined with range-for, this
611 allow convenient patterns like this:
613 for (inferior *inf : all_inferiors_safe ())
614 if (some_condition ())
618 inline all_inferiors_safe_range
619 all_inferiors_safe ()
624 /* Returns a range representing all inferiors, suitable to use with
625 range-for, like this:
627 for (inferior *inf : all_inferiors ())
631 inline all_inferiors_range
637 /* Return a range that can be used to walk over all inferiors with PID
638 not zero, with range-for. */
640 inline all_non_exited_inferiors_range
641 all_non_exited_inferiors ()
646 /* Prune away automatically added inferiors that aren't required
648 extern void prune_inferiors (void);
650 extern int number_of_inferiors (void);
652 extern struct inferior
*add_inferior_with_spaces (void);
654 /* Print the current selected inferior. */
655 extern void print_selected_inferior (struct ui_out
*uiout
);
657 #endif /* !defined (INFERIOR_H) */