xref: /dragonfly/contrib/gdb-7/gdb/inferior.h (revision 74a8b0f5)
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) 1986-2013 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 struct target_waitstatus;
25 struct frame_info;
26 struct ui_file;
27 struct type;
28 struct gdbarch;
29 struct regcache;
30 struct ui_out;
31 struct terminal_info;
32 struct target_desc_info;
33 
34 #include "ptid.h"
35 
36 /* For bpstat.  */
37 #include "breakpoint.h"
38 
39 /* For enum gdb_signal.  */
40 #include "target.h"
41 
42 /* For struct frame_id.  */
43 #include "frame.h"
44 
45 #include "progspace.h"
46 #include "registry.h"
47 
48 struct infcall_suspend_state;
49 struct infcall_control_state;
50 
51 extern struct infcall_suspend_state *save_infcall_suspend_state (void);
52 extern struct infcall_control_state *save_infcall_control_state (void);
53 
54 extern void restore_infcall_suspend_state (struct infcall_suspend_state *);
55 extern void restore_infcall_control_state (struct infcall_control_state *);
56 
57 extern struct cleanup *make_cleanup_restore_infcall_suspend_state
58 					    (struct infcall_suspend_state *);
59 extern struct cleanup *make_cleanup_restore_infcall_control_state
60 					    (struct infcall_control_state *);
61 
62 extern void discard_infcall_suspend_state (struct infcall_suspend_state *);
63 extern void discard_infcall_control_state (struct infcall_control_state *);
64 
65 extern struct regcache *
66   get_infcall_suspend_state_regcache (struct infcall_suspend_state *);
67 
68 /* Returns true if PTID matches filter FILTER.  FILTER can be the wild
69    card MINUS_ONE_PTID (all ptid match it); can be a ptid representing
70    a process (ptid_is_pid returns true), in which case, all lwps and
71    threads of that given process match, lwps and threads of other
72    processes do not; or, it can represent a specific thread, in which
73    case, only that thread will match true.  PTID must represent a
74    specific LWP or THREAD, it can never be a wild card.  */
75 
76 extern int ptid_match (ptid_t ptid, ptid_t filter);
77 
78 /* Save value of inferior_ptid so that it may be restored by
79    a later call to do_cleanups().  Returns the struct cleanup
80    pointer needed for later doing the cleanup.  */
81 extern struct cleanup * save_inferior_ptid (void);
82 
83 extern void set_sigint_trap (void);
84 
85 extern void clear_sigint_trap (void);
86 
87 /* Set/get file name for default use for standard in/out in the inferior.  */
88 
89 extern void set_inferior_io_terminal (const char *terminal_name);
90 extern const char *get_inferior_io_terminal (void);
91 
92 /* Collected pid, tid, etc. of the debugged inferior.  When there's
93    no inferior, PIDGET (inferior_ptid) will be 0.  */
94 
95 extern ptid_t inferior_ptid;
96 
97 /* Are we simulating synchronous execution? This is used in async gdb
98    to implement the 'run', 'continue' etc commands, which will not
99    redisplay the prompt until the execution is actually over.  */
100 extern int sync_execution;
101 
102 /* Inferior environment.  */
103 
104 extern void clear_proceed_status (void);
105 
106 extern void proceed (CORE_ADDR, enum gdb_signal, int);
107 
108 extern int sched_multi;
109 
110 /* When set, stop the 'step' command if we enter a function which has
111    no line number information.  The normal behavior is that we step
112    over such function.  */
113 extern int step_stop_if_no_debug;
114 
115 /* If set, the inferior should be controlled in non-stop mode.  In
116    this mode, each thread is controlled independently.  Execution
117    commands apply only to the selected thread by default, and stop
118    events stop only the thread that had the event -- the other threads
119    are kept running freely.  */
120 extern int non_stop;
121 
122 /* If set (default), when following a fork, GDB will detach from one
123    the fork branches, child or parent.  Exactly which branch is
124    detached depends on 'set follow-fork-mode' setting.  */
125 extern int detach_fork;
126 
127 /* When set (default), the target should attempt to disable the operating
128    system's address space randomization feature when starting an inferior.  */
129 extern int disable_randomization;
130 
131 extern void generic_mourn_inferior (void);
132 
133 extern void terminal_save_ours (void);
134 
135 extern void terminal_ours (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 wait_for_inferior (void);
151 
152 extern void prepare_for_detach (void);
153 
154 extern void fetch_inferior_event (void *);
155 
156 extern void init_wait_for_inferior (void);
157 
158 extern void reopen_exec_file (void);
159 
160 /* The `resume' routine should only be called in special circumstances.
161    Normally, use `proceed', which handles a lot of bookkeeping.  */
162 
163 extern void resume (int, enum gdb_signal);
164 
165 extern ptid_t user_visible_resume_ptid (int step);
166 
167 extern void insert_step_resume_breakpoint_at_sal (struct gdbarch *,
168 						  struct symtab_and_line ,
169 						  struct frame_id);
170 
171 /* From misc files */
172 
173 extern void default_print_registers_info (struct gdbarch *gdbarch,
174 					  struct ui_file *file,
175 					  struct frame_info *frame,
176 					  int regnum, int all);
177 
178 extern void child_terminal_info (char *, int);
179 
180 extern void term_info (char *, int);
181 
182 extern void terminal_ours_for_output (void);
183 
184 extern void terminal_inferior (void);
185 
186 extern void terminal_init_inferior (void);
187 
188 extern void terminal_init_inferior_with_pgrp (int pgrp);
189 
190 /* From fork-child.c */
191 
192 extern int fork_inferior (char *, char *, char **,
193 			  void (*)(void),
194 			  void (*)(int), void (*)(void), char *,
195                           void (*)(const char *,
196                                    char * const *, char * const *));
197 
198 
199 extern void startup_inferior (int);
200 
201 extern char *construct_inferior_arguments (int, char **);
202 
203 /* From infrun.c */
204 
205 extern unsigned int debug_infrun;
206 
207 extern int stop_on_solib_events;
208 
209 extern void start_remote (int from_tty);
210 
211 extern void normal_stop (void);
212 
213 extern int signal_stop_state (int);
214 
215 extern int signal_print_state (int);
216 
217 extern int signal_pass_state (int);
218 
219 extern int signal_stop_update (int, int);
220 
221 extern int signal_print_update (int, int);
222 
223 extern int signal_pass_update (int, int);
224 
225 extern void get_last_target_status(ptid_t *ptid,
226                                    struct target_waitstatus *status);
227 
228 extern void follow_inferior_reset_breakpoints (void);
229 
230 void set_step_info (struct frame_info *frame, struct symtab_and_line sal);
231 
232 /* From infcmd.c */
233 
234 extern void post_create_inferior (struct target_ops *, int);
235 
236 extern void attach_command (char *, int);
237 
238 extern char *get_inferior_args (void);
239 
240 extern void set_inferior_args (char *);
241 
242 extern void set_inferior_args_vector (int, char **);
243 
244 extern void registers_info (char *, int);
245 
246 extern void continue_1 (int all_threads);
247 
248 extern void interrupt_target_1 (int all_threads);
249 
250 extern void delete_longjmp_breakpoint_cleanup (void *arg);
251 
252 extern void detach_command (char *, int);
253 
254 extern void notice_new_inferior (ptid_t, int, int);
255 
256 extern struct value *get_return_value (struct value *function,
257                                        struct type *value_type);
258 
259 /* Address at which inferior stopped.  */
260 
261 extern CORE_ADDR stop_pc;
262 
263 /* Nonzero if stopped due to completion of a stack dummy routine.  */
264 
265 extern enum stop_stack_kind stop_stack_dummy;
266 
267 /* Nonzero if program stopped due to a random (unexpected) signal in
268    inferior process.  */
269 
270 extern int stopped_by_random_signal;
271 
272 /* STEP_OVER_ALL means step over all subroutine calls.
273    STEP_OVER_UNDEBUGGABLE means step over calls to undebuggable functions.
274    STEP_OVER_NONE means don't step over any subroutine calls.  */
275 
276 enum step_over_calls_kind
277   {
278     STEP_OVER_NONE,
279     STEP_OVER_ALL,
280     STEP_OVER_UNDEBUGGABLE
281   };
282 
283 /* Anything but NO_STOP_QUIETLY means we expect a trap and the caller
284    will handle it themselves.  STOP_QUIETLY is used when running in
285    the shell before the child program has been exec'd and when running
286    through shared library loading.  STOP_QUIETLY_REMOTE is used when
287    setting up a remote connection; it is like STOP_QUIETLY_NO_SIGSTOP
288    except that there is no need to hide a signal.  */
289 
290 /* It is also used after attach, due to attaching to a process.  This
291    is a bit trickier.  When doing an attach, the kernel stops the
292    debuggee with a SIGSTOP.  On newer GNU/Linux kernels (>= 2.5.61)
293    the handling of SIGSTOP for a ptraced process has changed.  Earlier
294    versions of the kernel would ignore these SIGSTOPs, while now
295    SIGSTOP is treated like any other signal, i.e. it is not muffled.
296 
297    If the gdb user does a 'continue' after the 'attach', gdb passes
298    the global variable stop_signal (which stores the signal from the
299    attach, SIGSTOP) to the ptrace(PTRACE_CONT,...)  call.  This is
300    problematic, because the kernel doesn't ignore such SIGSTOP
301    now.  I.e. it is reported back to gdb, which in turn presents it
302    back to the user.
303 
304    To avoid the problem, we use STOP_QUIETLY_NO_SIGSTOP, which allows
305    gdb to clear the value of stop_signal after the attach, so that it
306    is not passed back down to the kernel.  */
307 
308 enum stop_kind
309   {
310     NO_STOP_QUIETLY = 0,
311     STOP_QUIETLY,
312     STOP_QUIETLY_REMOTE,
313     STOP_QUIETLY_NO_SIGSTOP
314   };
315 
316 /* Reverse execution.  */
317 enum exec_direction_kind
318   {
319     EXEC_FORWARD,
320     EXEC_REVERSE
321   };
322 
323 /* The current execution direction.  This should only be set to enum
324    exec_direction_kind values.  It is only an int to make it
325    compatible with make_cleanup_restore_integer.  */
326 extern int execution_direction;
327 
328 /* Save register contents here when executing a "finish" command or are
329    about to pop a stack dummy frame, if-and-only-if proceed_to_finish is set.
330    Thus this contains the return value from the called function (assuming
331    values are returned in a register).  */
332 
333 extern struct regcache *stop_registers;
334 
335 /* True if we are debugging displaced stepping.  */
336 extern int debug_displaced;
337 
338 /* Dump LEN bytes at BUF in hex to FILE, followed by a newline.  */
339 void displaced_step_dump_bytes (struct ui_file *file,
340                                 const gdb_byte *buf, size_t len);
341 
342 struct displaced_step_closure *get_displaced_step_closure_by_addr (CORE_ADDR addr);
343 
344 /* Possible values for gdbarch_call_dummy_location.  */
345 #define ON_STACK 1
346 #define AT_ENTRY_POINT 4
347 
348 /* If STARTUP_WITH_SHELL is set, GDB's "run"
349    will attempts to start up the debugee under a shell.
350    This is in order for argument-expansion to occur.  E.g.,
351    (gdb) run *
352    The "*" gets expanded by the shell into a list of files.
353    While this is a nice feature, it turns out to interact badly
354    with some of the catch-fork/catch-exec features we have added.
355    In particular, if the shell does any fork/exec's before
356    the exec of the target program, that can confuse GDB.
357    To disable this feature, set STARTUP_WITH_SHELL to 0.
358    To enable this feature, set STARTUP_WITH_SHELL to 1.
359    The catch-exec traps expected during start-up will
360    be 1 if target is not started up with a shell, 2 if it is.
361    - RT
362    If you disable this, you need to decrement
363    START_INFERIOR_TRAPS_EXPECTED in tm.h.  */
364 #define STARTUP_WITH_SHELL 1
365 #if !defined(START_INFERIOR_TRAPS_EXPECTED)
366 #define START_INFERIOR_TRAPS_EXPECTED	2
367 #endif
368 
369 struct private_inferior;
370 
371 /* Inferior process specific part of `struct infcall_control_state'.
372 
373    Inferior thread counterpart is `struct thread_control_state'.  */
374 
375 struct inferior_control_state
376 {
377   /* See the definition of stop_kind above.  */
378   enum stop_kind stop_soon;
379 };
380 
381 /* Inferior process specific part of `struct infcall_suspend_state'.
382 
383    Inferior thread counterpart is `struct thread_suspend_state'.  */
384 
385 #if 0 /* Currently unused and empty structures are not valid C.  */
386 struct inferior_suspend_state
387 {
388 };
389 #endif
390 
391 /* GDB represents the state of each program execution with an object
392    called an inferior.  An inferior typically corresponds to a process
393    but is more general and applies also to targets that do not have a
394    notion of processes.  Each run of an executable creates a new
395    inferior, as does each attachment to an existing process.
396    Inferiors have unique internal identifiers that are different from
397    target process ids.  Each inferior may in turn have multiple
398    threads running in it.  */
399 
400 struct inferior
401 {
402   /* Pointer to next inferior in singly-linked list of inferiors.  */
403   struct inferior *next;
404 
405   /* Convenient handle (GDB inferior id).  Unique across all
406      inferiors.  */
407   int num;
408 
409   /* Actual target inferior id, usually, a process id.  This matches
410      the ptid_t.pid member of threads of this inferior.  */
411   int pid;
412   /* True if the PID was actually faked by GDB.  */
413   int fake_pid_p;
414 
415   /* State of GDB control of inferior process execution.
416      See `struct inferior_control_state'.  */
417   struct inferior_control_state control;
418 
419   /* State of inferior process to restore after GDB is done with an inferior
420      call.  See `struct inferior_suspend_state'.  */
421 #if 0 /* Currently unused and empty structures are not valid C.  */
422   struct inferior_suspend_state suspend;
423 #endif
424 
425   /* True if this was an auto-created inferior, e.g. created from
426      following a fork; false, if this inferior was manually added by
427      the user, and we should not attempt to prune it
428      automatically.  */
429   int removable;
430 
431   /* The address space bound to this inferior.  */
432   struct address_space *aspace;
433 
434   /* The program space bound to this inferior.  */
435   struct program_space *pspace;
436 
437   /* The arguments string to use when running.  */
438   char *args;
439 
440   /* The size of elements in argv.  */
441   int argc;
442 
443   /* The vector version of arguments.  If ARGC is nonzero,
444      then we must compute ARGS from this (via the target).
445      This is always coming from main's argv and therefore
446      should never be freed.  */
447   char **argv;
448 
449   /* The name of terminal device to use for I/O.  */
450   char *terminal;
451 
452   /* Environment to use for running inferior,
453      in format described in environ.h.  */
454   struct gdb_environ *environment;
455 
456   /* Nonzero if this child process was attached rather than
457      forked.  */
458   int attach_flag;
459 
460   /* If this inferior is a vfork child, then this is the pointer to
461      its vfork parent, if GDB is still attached to it.  */
462   struct inferior *vfork_parent;
463 
464   /* If this process is a vfork parent, this is the pointer to the
465      child.  Since a vfork parent is left frozen by the kernel until
466      the child execs or exits, a process can only have one vfork child
467      at a given time.  */
468   struct inferior *vfork_child;
469 
470   /* True if this inferior should be detached when it's vfork sibling
471      exits or execs.  */
472   int pending_detach;
473 
474   /* True if this inferior is a vfork parent waiting for a vfork child
475      not under our control to be done with the shared memory region,
476      either by exiting or execing.  */
477   int waiting_for_vfork_done;
478 
479   /* True if we're in the process of detaching from this inferior.  */
480   int detaching;
481 
482   /* What is left to do for an execution command after any thread of
483      this inferior stops.  For continuations associated with a
484      specific thread, see `struct thread_info'.  */
485   struct continuation *continuations;
486 
487   /* Private data used by the target vector implementation.  */
488   struct private_inferior *private;
489 
490   /* HAS_EXIT_CODE is true if the inferior exited with an exit code.
491      In this case, the EXIT_CODE field is also valid.  */
492   int has_exit_code;
493   LONGEST exit_code;
494 
495   /* Default flags to pass to the symbol reading functions.  These are
496      used whenever a new objfile is created.  The valid values come
497      from enum symfile_add_flags.  */
498   int symfile_flags;
499 
500   /* Info about an inferior's target description (if it's fetched; the
501      user supplied description's filename, if any; etc.).  */
502   struct target_desc_info *tdesc_info;
503 
504   /* The architecture associated with the inferior through the
505      connection to the target.
506 
507      The architecture vector provides some information that is really
508      a property of the inferior, accessed through a particular target:
509      ptrace operations; the layout of certain RSP packets; the
510      solib_ops vector; etc.  To differentiate architecture accesses to
511      per-inferior/target properties from
512      per-thread/per-frame/per-objfile properties, accesses to
513      per-inferior/target properties should be made through
514      this gdbarch.  */
515   struct gdbarch *gdbarch;
516 
517   /* Per inferior data-pointers required by other GDB modules.  */
518   REGISTRY_FIELDS;
519 };
520 
521 /* Keep a registry of per-inferior data-pointers required by other GDB
522    modules.  */
523 
524 DECLARE_REGISTRY (inferior);
525 
526 /* Create an empty inferior list, or empty the existing one.  */
527 extern void init_inferior_list (void);
528 
529 /* Add an inferior to the inferior list, print a message that a new
530    inferior is found, and return the pointer to the new inferior.
531    Caller may use this pointer to initialize the private inferior
532    data.  */
533 extern struct inferior *add_inferior (int pid);
534 
535 /* Same as add_inferior, but don't print new inferior notifications to
536    the CLI.  */
537 extern struct inferior *add_inferior_silent (int pid);
538 
539 /* Delete an existing inferior list entry, due to inferior exit.  */
540 extern void delete_inferior (int pid);
541 
542 extern void delete_inferior_1 (struct inferior *todel, int silent);
543 
544 /* Same as delete_inferior, but don't print new inferior notifications
545    to the CLI.  */
546 extern void delete_inferior_silent (int pid);
547 
548 /* Delete an existing inferior list entry, due to inferior detaching.  */
549 extern void detach_inferior (int pid);
550 
551 extern void exit_inferior (int pid);
552 
553 extern void exit_inferior_silent (int pid);
554 
555 extern void exit_inferior_num_silent (int num);
556 
557 extern void inferior_appeared (struct inferior *inf, int pid);
558 
559 /* Get rid of all inferiors.  */
560 extern void discard_all_inferiors (void);
561 
562 /* Translate the integer inferior id (GDB's homegrown id, not the system's)
563    into a "pid" (which may be overloaded with extra inferior information).  */
564 extern int gdb_inferior_id_to_pid (int);
565 
566 /* Translate a target 'pid' into the integer inferior id (GDB's
567    homegrown id, not the system's).  */
568 extern int pid_to_gdb_inferior_id (int pid);
569 
570 /* Boolean test for an already-known pid.  */
571 extern int in_inferior_list (int pid);
572 
573 /* Boolean test for an already-known inferior id (GDB's homegrown id,
574    not the system's).  */
575 extern int valid_gdb_inferior_id (int num);
576 
577 /* Search function to lookup an inferior by target 'pid'.  */
578 extern struct inferior *find_inferior_pid (int pid);
579 
580 /* Search function to lookup an inferior by GDB 'num'.  */
581 extern struct inferior *find_inferior_id (int num);
582 
583 /* Find an inferior bound to PSPACE.  */
584 extern struct inferior *
585   find_inferior_for_program_space (struct program_space *pspace);
586 
587 /* Inferior iterator function.
588 
589    Calls a callback function once for each inferior, so long as the
590    callback function returns false.  If the callback function returns
591    true, the iteration will end and the current inferior will be
592    returned.  This can be useful for implementing a search for a
593    inferior with arbitrary attributes, or for applying some operation
594    to every inferior.
595 
596    It is safe to delete the iterated inferior from the callback.  */
597 extern struct inferior *iterate_over_inferiors (int (*) (struct inferior *,
598 							 void *),
599 						void *);
600 
601 /* Returns true if the inferior list is not empty.  */
602 extern int have_inferiors (void);
603 
604 /* Returns true if there are any live inferiors in the inferior list
605    (not cores, not executables, real live processes).  */
606 extern int have_live_inferiors (void);
607 
608 /* Return a pointer to the current inferior.  It is an error to call
609    this if there is no current inferior.  */
610 extern struct inferior *current_inferior (void);
611 
612 extern void set_current_inferior (struct inferior *);
613 
614 extern struct cleanup *save_current_inferior (void);
615 
616 /* Traverse all inferiors.  */
617 
618 #define ALL_INFERIORS(I) \
619   for ((I) = inferior_list; (I); (I) = (I)->next)
620 
621 extern struct inferior *inferior_list;
622 
623 /* Prune away automatically added inferiors that aren't required
624    anymore.  */
625 extern void prune_inferiors (void);
626 
627 extern int number_of_inferiors (void);
628 
629 extern struct inferior *add_inferior_with_spaces (void);
630 
631 extern void update_observer_mode (void);
632 
633 extern void update_signals_program_target (void);
634 
635 extern void signal_catch_update (const unsigned int *);
636 
637 /* In some circumstances we allow a command to specify a numeric
638    signal.  The idea is to keep these circumstances limited so that
639    users (and scripts) develop portable habits.  For comparison,
640    POSIX.2 `kill' requires that 1,2,3,6,9,14, and 15 work (and using a
641    numeric signal at all is obsolescent.  We are slightly more lenient
642    and allow 1-15 which should match host signal numbers on most
643    systems.  Use of symbolic signal names is strongly encouraged.  */
644 
645 enum gdb_signal gdb_signal_from_command (int num);
646 
647 #endif /* !defined (INFERIOR_H) */
648