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) 1986-2017 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 #include "progspace.h"
49 #include "symfile-add-flags.h"
50 #include "common/refcounted-object.h"
52 #include "common-inferior.h"
54 struct infcall_suspend_state;
55 struct infcall_control_state;
57 extern struct infcall_suspend_state *save_infcall_suspend_state (void);
58 extern struct infcall_control_state *save_infcall_control_state (void);
60 extern void restore_infcall_suspend_state (struct infcall_suspend_state *);
61 extern void restore_infcall_control_state (struct infcall_control_state *);
63 extern struct cleanup *make_cleanup_restore_infcall_suspend_state
64 (struct infcall_suspend_state *);
65 extern struct cleanup *make_cleanup_restore_infcall_control_state
66 (struct infcall_control_state *);
68 extern void discard_infcall_suspend_state (struct infcall_suspend_state *);
69 extern void discard_infcall_control_state (struct infcall_control_state *);
71 extern struct regcache *
72 get_infcall_suspend_state_regcache (struct infcall_suspend_state *);
74 /* Save value of inferior_ptid so that it may be restored by
75 a later call to do_cleanups(). Returns the struct cleanup
76 pointer needed for later doing the cleanup. */
77 extern struct cleanup * save_inferior_ptid (void);
79 extern void set_sigint_trap (void);
81 extern void clear_sigint_trap (void);
83 /* Set/get file name for default use for standard in/out in the inferior. */
85 extern void set_inferior_io_terminal (const char *terminal_name);
86 extern const char *get_inferior_io_terminal (void);
88 /* Collected pid, tid, etc. of the debugged inferior. When there's
89 no inferior, ptid_get_pid (inferior_ptid) will be 0. */
91 extern ptid_t inferior_ptid;
93 extern void generic_mourn_inferior (void);
95 extern CORE_ADDR unsigned_pointer_to_address (struct gdbarch *gdbarch,
98 extern void unsigned_address_to_pointer (struct gdbarch *gdbarch,
99 struct type *type, gdb_byte *buf,
101 extern CORE_ADDR signed_pointer_to_address (struct gdbarch *gdbarch,
103 const gdb_byte *buf);
104 extern void address_to_signed_pointer (struct gdbarch *gdbarch,
105 struct type *type, gdb_byte *buf,
108 extern void reopen_exec_file (void);
110 /* From misc files */
112 extern void default_print_registers_info (struct gdbarch *gdbarch,
113 struct ui_file *file,
114 struct frame_info *frame,
115 int regnum, int all);
117 /* Default implementation of gdbarch_print_float_info. Print
118 the values of all floating point registers. */
120 extern void default_print_float_info (struct gdbarch *gdbarch,
121 struct ui_file *file,
122 struct frame_info *frame,
125 extern void child_terminal_info (struct target_ops *self, const char *, int);
127 extern void term_info (char *, int);
129 extern void child_terminal_ours (struct target_ops *self);
131 extern void child_terminal_ours_for_output (struct target_ops *self);
133 extern void child_terminal_inferior (struct target_ops *self);
135 extern void child_terminal_init (struct target_ops *self);
137 extern void child_terminal_init_with_pgrp (int pgrp);
139 /* From fork-child.c */
141 /* Helper function to call STARTUP_INFERIOR with PID and NUM_TRAPS.
142 This function already calls set_executing. Return the ptid_t from
144 extern ptid_t gdb_startup_inferior (pid_t pid, int num_traps);
146 extern char *construct_inferior_arguments (int, char **);
150 /* Initial inferior setup. Determines the exec file is not yet known,
151 takes any necessary post-attaching actions, fetches the target
152 description and syncs the shared library list. */
154 extern void setup_inferior (int from_tty);
156 extern void post_create_inferior (struct target_ops *, int);
158 extern void attach_command (char *, int);
160 extern char *get_inferior_args (void);
162 extern void set_inferior_args (char *);
164 extern void set_inferior_args_vector (int, char **);
166 extern void registers_info (char *, int);
168 extern void continue_1 (int all_threads);
170 extern void interrupt_target_1 (int all_threads);
172 extern void delete_longjmp_breakpoint_cleanup (void *arg);
174 extern void detach_command (char *, int);
176 extern void notice_new_inferior (ptid_t, int, int);
178 extern struct value *get_return_value (struct value *function,
179 struct type *value_type);
181 /* Prepare for execution command. TARGET is the target that will run
182 the command. BACKGROUND determines whether this is a foreground
183 (synchronous) or background (asynchronous) command. */
185 extern void prepare_execution_command (struct target_ops *target,
188 /* Whether to start up the debuggee under a shell.
190 If startup-with-shell is set, GDB's "run" will attempt to start up
191 the debuggee under a shell.
193 This is in order for argument-expansion to occur. E.g.,
197 The "*" gets expanded by the shell into a list of files.
199 While this is a nice feature, it may be handy to bypass the shell
200 in some cases. To disable this feature, do "set startup-with-shell
203 The catch-exec traps expected during start-up will be one more if
204 the target is started up with a shell. */
205 extern int startup_with_shell;
207 /* Address at which inferior stopped. */
209 extern CORE_ADDR stop_pc;
211 /* Nonzero if stopped due to completion of a stack dummy routine. */
213 extern enum stop_stack_kind stop_stack_dummy;
215 /* Nonzero if program stopped due to a random (unexpected) signal in
218 extern int stopped_by_random_signal;
220 /* STEP_OVER_ALL means step over all subroutine calls.
221 STEP_OVER_UNDEBUGGABLE means step over calls to undebuggable functions.
222 STEP_OVER_NONE means don't step over any subroutine calls. */
224 enum step_over_calls_kind
228 STEP_OVER_UNDEBUGGABLE
231 /* Anything but NO_STOP_QUIETLY means we expect a trap and the caller
232 will handle it themselves. STOP_QUIETLY is used when running in
233 the shell before the child program has been exec'd and when running
234 through shared library loading. STOP_QUIETLY_REMOTE is used when
235 setting up a remote connection; it is like STOP_QUIETLY_NO_SIGSTOP
236 except that there is no need to hide a signal. */
238 /* STOP_QUIETLY_NO_SIGSTOP is used to handle a tricky situation with attach.
239 When doing an attach, the kernel stops the debuggee with a SIGSTOP.
240 On newer GNU/Linux kernels (>= 2.5.61) the handling of SIGSTOP for
241 a ptraced process has changed. Earlier versions of the kernel
242 would ignore these SIGSTOPs, while now SIGSTOP is treated like any
243 other signal, i.e. it is not muffled.
245 If the gdb user does a 'continue' after the 'attach', gdb passes
246 the global variable stop_signal (which stores the signal from the
247 attach, SIGSTOP) to the ptrace(PTRACE_CONT,...) call. This is
248 problematic, because the kernel doesn't ignore such SIGSTOP
249 now. I.e. it is reported back to gdb, which in turn presents it
252 To avoid the problem, we use STOP_QUIETLY_NO_SIGSTOP, which allows
253 gdb to clear the value of stop_signal after the attach, so that it
254 is not passed back down to the kernel. */
261 STOP_QUIETLY_NO_SIGSTOP
265 /* Possible values for gdbarch_call_dummy_location. */
267 #define AT_ENTRY_POINT 4
269 struct private_inferior;
271 /* Inferior process specific part of `struct infcall_control_state'.
273 Inferior thread counterpart is `struct thread_control_state'. */
275 struct inferior_control_state
277 /* See the definition of stop_kind above. */
278 enum stop_kind stop_soon;
281 /* Return a pointer to the current inferior. */
282 extern inferior *current_inferior ();
284 extern void set_current_inferior (inferior *);
286 /* GDB represents the state of each program execution with an object
287 called an inferior. An inferior typically corresponds to a process
288 but is more general and applies also to targets that do not have a
289 notion of processes. Each run of an executable creates a new
290 inferior, as does each attachment to an existing process.
291 Inferiors have unique internal identifiers that are different from
292 target process ids. Each inferior may in turn have multiple
293 threads running in it.
295 Inferiors are intrusively refcounted objects. Unlike thread
296 objects, being the user-selected inferior is considered a strong
297 reference and is thus accounted for in the inferior object's
298 refcount (see set_current_inferior). When GDB needs to remember
299 the selected inferior to later restore it, GDB temporarily bumps
300 the inferior object's refcount, to prevent something deleting the
301 inferior object before reverting back (e.g., due to a
302 "remove-inferiors" command (see
303 make_cleanup_restore_current_thread). All other inferior
304 references are considered weak references. Inferiors are always
305 listed exactly once in the inferior list, so placing an inferior in
306 the inferior list is an implicit, not counted strong reference. */
308 class inferior : public refcounted_object
311 explicit inferior (int pid);
314 /* Returns true if we can delete this inferior. */
315 bool deletable () const { return refcount () == 0; }
317 /* Pointer to next inferior in singly-linked list of inferiors. */
318 struct inferior *next = NULL;
320 /* Convenient handle (GDB inferior id). Unique across all
324 /* Actual target inferior id, usually, a process id. This matches
325 the ptid_t.pid member of threads of this inferior. */
327 /* True if the PID was actually faked by GDB. */
328 bool fake_pid_p = false;
330 /* The highest thread number this inferior ever had. */
331 int highest_thread_num = 0;
333 /* State of GDB control of inferior process execution.
334 See `struct inferior_control_state'. */
335 inferior_control_state control {NO_STOP_QUIETLY};
337 /* True if this was an auto-created inferior, e.g. created from
338 following a fork; false, if this inferior was manually added by
339 the user, and we should not attempt to prune it
341 bool removable = false;
343 /* The address space bound to this inferior. */
344 struct address_space *aspace = NULL;
346 /* The program space bound to this inferior. */
347 struct program_space *pspace = NULL;
349 /* The arguments string to use when running. */
352 /* The size of elements in argv. */
355 /* The vector version of arguments. If ARGC is nonzero,
356 then we must compute ARGS from this (via the target).
357 This is always coming from main's argv and therefore
358 should never be freed. */
361 /* The name of terminal device to use for I/O. */
362 char *terminal = NULL;
364 /* Environment to use for running inferior,
365 in format described in environ.h. */
366 gdb_environ *environment = NULL;
368 /* True if this child process was attached rather than forked. */
369 bool attach_flag = false;
371 /* If this inferior is a vfork child, then this is the pointer to
372 its vfork parent, if GDB is still attached to it. */
373 inferior *vfork_parent = NULL;
375 /* If this process is a vfork parent, this is the pointer to the
376 child. Since a vfork parent is left frozen by the kernel until
377 the child execs or exits, a process can only have one vfork child
379 inferior *vfork_child = NULL;
381 /* True if this inferior should be detached when it's vfork sibling
383 bool pending_detach = false;
385 /* True if this inferior is a vfork parent waiting for a vfork child
386 not under our control to be done with the shared memory region,
387 either by exiting or execing. */
388 bool waiting_for_vfork_done = false;
390 /* True if we're in the process of detaching from this inferior. */
391 bool detaching = false;
393 /* What is left to do for an execution command after any thread of
394 this inferior stops. For continuations associated with a
395 specific thread, see `struct thread_info'. */
396 continuation *continuations = NULL;
398 /* True if setup_inferior wasn't called for this inferior yet.
399 Until that is done, we must not access inferior memory or
400 registers, as we haven't determined the target
401 architecture/description. */
402 bool needs_setup = false;
404 /* Private data used by the target vector implementation. */
405 private_inferior *priv = NULL;
407 /* HAS_EXIT_CODE is true if the inferior exited with an exit code.
408 In this case, the EXIT_CODE field is also valid. */
409 bool has_exit_code = false;
410 LONGEST exit_code = 0;
412 /* Default flags to pass to the symbol reading functions. These are
413 used whenever a new objfile is created. */
414 symfile_add_flags symfile_flags = 0;
416 /* Info about an inferior's target description (if it's fetched; the
417 user supplied description's filename, if any; etc.). */
418 target_desc_info *tdesc_info = NULL;
420 /* The architecture associated with the inferior through the
421 connection to the target.
423 The architecture vector provides some information that is really
424 a property of the inferior, accessed through a particular target:
425 ptrace operations; the layout of certain RSP packets; the
426 solib_ops vector; etc. To differentiate architecture accesses to
427 per-inferior/target properties from
428 per-thread/per-frame/per-objfile properties, accesses to
429 per-inferior/target properties should be made through
431 struct gdbarch *gdbarch = NULL;
433 /* Per inferior data-pointers required by other GDB modules. */
437 /* Keep a registry of per-inferior data-pointers required by other GDB
440 DECLARE_REGISTRY (inferior);
442 /* Add an inferior to the inferior list, print a message that a new
443 inferior is found, and return the pointer to the new inferior.
444 Caller may use this pointer to initialize the private inferior
446 extern struct inferior *add_inferior (int pid);
448 /* Same as add_inferior, but don't print new inferior notifications to
450 extern struct inferior *add_inferior_silent (int pid);
452 extern void delete_inferior (struct inferior *todel);
454 /* Delete an existing inferior list entry, due to inferior detaching. */
455 extern void detach_inferior (int pid);
457 extern void exit_inferior (int pid);
459 extern void exit_inferior_silent (int pid);
461 extern void exit_inferior_num_silent (int num);
463 extern void inferior_appeared (struct inferior *inf, int pid);
465 /* Get rid of all inferiors. */
466 extern void discard_all_inferiors (void);
468 /* Translate the integer inferior id (GDB's homegrown id, not the system's)
469 into a "pid" (which may be overloaded with extra inferior information). */
470 extern int gdb_inferior_id_to_pid (int);
472 /* Translate a target 'pid' into the integer inferior id (GDB's
473 homegrown id, not the system's). */
474 extern int pid_to_gdb_inferior_id (int pid);
476 /* Boolean test for an already-known pid. */
477 extern int in_inferior_list (int pid);
479 /* Boolean test for an already-known inferior id (GDB's homegrown id,
480 not the system's). */
481 extern int valid_gdb_inferior_id (int num);
483 /* Search function to lookup an inferior by target 'pid'. */
484 extern struct inferior *find_inferior_pid (int pid);
486 /* Search function to lookup an inferior whose pid is equal to 'ptid.pid'. */
487 extern struct inferior *find_inferior_ptid (ptid_t ptid);
489 /* Search function to lookup an inferior by GDB 'num'. */
490 extern struct inferior *find_inferior_id (int num);
492 /* Find an inferior bound to PSPACE, giving preference to the current
494 extern struct inferior *
495 find_inferior_for_program_space (struct program_space *pspace);
497 /* Inferior iterator function.
499 Calls a callback function once for each inferior, so long as the
500 callback function returns false. If the callback function returns
501 true, the iteration will end and the current inferior will be
502 returned. This can be useful for implementing a search for a
503 inferior with arbitrary attributes, or for applying some operation
506 It is safe to delete the iterated inferior from the callback. */
507 extern struct inferior *iterate_over_inferiors (int (*) (struct inferior *,
511 /* Returns true if the inferior list is not empty. */
512 extern int have_inferiors (void);
514 /* Returns the number of live inferiors (real live processes). */
515 extern int number_of_live_inferiors (void);
517 /* Returns true if there are any live inferiors in the inferior list
518 (not cores, not executables, real live processes). */
519 extern int have_live_inferiors (void);
521 /* Save/restore the current inferior. */
523 class scoped_restore_current_inferior
526 scoped_restore_current_inferior ()
527 : m_saved_inf (current_inferior ())
530 ~scoped_restore_current_inferior ()
531 { set_current_inferior (m_saved_inf); }
534 scoped_restore_current_inferior
535 (const scoped_restore_current_inferior &) = delete;
537 (const scoped_restore_current_inferior &) = delete;
540 inferior *m_saved_inf;
544 /* Traverse all inferiors. */
546 #define ALL_INFERIORS(I) \
547 for ((I) = inferior_list; (I); (I) = (I)->next)
549 /* Traverse all non-exited inferiors. */
551 #define ALL_NON_EXITED_INFERIORS(I) \
555 extern struct inferior *inferior_list;
557 /* Prune away automatically added inferiors that aren't required
559 extern void prune_inferiors (void);
561 extern int number_of_inferiors (void);
563 extern struct inferior *add_inferior_with_spaces (void);
565 /* Print the current selected inferior. */
566 extern void print_selected_inferior (struct ui_out *uiout);
568 #endif /* !defined (INFERIOR_H) */