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, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996,
   5    1998, 1999, 2000, 2001, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
   6    2011 Free Software Foundation, Inc.
   7
   8    This file is part of GDB.
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  22
  23 #if !defined (INFERIOR_H)
  24 #define INFERIOR_H 1
  25
  26 struct target_waitstatus;
  27 struct frame_info;
  28 struct ui_file;
  29 struct type;
  30 struct gdbarch;
  31 struct regcache;
  32 struct ui_out;
  33 struct terminal_info;
  34
  35 /* For bpstat.  */
  36 #include "breakpoint.h"
  37
  38 /* For enum target_signal.  */
  39 #include "target.h"
  40
  41 /* For struct frame_id.  */
  42 #include "frame.h"
  43
  44 #include "progspace.h"
  45
  46 struct infcall_suspend_state;
  47 struct infcall_control_state;
  48
  49 extern struct infcall_suspend_state *save_infcall_suspend_state (void);
  50 extern struct infcall_control_state *save_infcall_control_state (void);
  51
  52 extern void restore_infcall_suspend_state (struct infcall_suspend_state *);
  53 extern void restore_infcall_control_state (struct infcall_control_state *);
  54
  55 extern struct cleanup *make_cleanup_restore_infcall_suspend_state
  56                                             (struct infcall_suspend_state *);
  57 extern struct cleanup *make_cleanup_restore_infcall_control_state
  58                                             (struct infcall_control_state *);
  59
  60 extern void discard_infcall_suspend_state (struct infcall_suspend_state *);
  61 extern void discard_infcall_control_state (struct infcall_control_state *);
  62
  63 extern struct regcache *
  64   get_infcall_suspend_state_regcache (struct infcall_suspend_state *);
  65
  66 /* The -1 ptid, often used to indicate either an error condition
  67    or a "don't care" condition, i.e, "run all threads."  */
  68 extern ptid_t minus_one_ptid;
  69
  70 /* The null or zero ptid, often used to indicate no process.  */
  71 extern ptid_t null_ptid;
  72
  73 /* Attempt to find and return an existing ptid with the given PID, LWP,
  74    and TID components.  If none exists, create a new one and return
  75    that.  */
  76 ptid_t ptid_build (int pid, long lwp, long tid);
  77
  78 /* Find/Create a ptid from just a pid.  */
  79 ptid_t pid_to_ptid (int pid);
  80
  81 /* Fetch the pid (process id) component from a ptid.  */
  82 int ptid_get_pid (ptid_t ptid);
  83
  84 /* Fetch the lwp (lightweight process) component from a ptid.  */
  85 long ptid_get_lwp (ptid_t ptid);
  86
  87 /* Fetch the tid (thread id) component from a ptid.  */
  88 long ptid_get_tid (ptid_t ptid);
  89
  90 /* Compare two ptids to see if they are equal.  */
  91 extern int ptid_equal (ptid_t p1, ptid_t p2);
  92
  93 /* Return true if PTID represents a process id.  */
  94 extern int ptid_is_pid (ptid_t ptid);
  95
  96 /* Returns true if PTID matches filter FILTER.  FILTER can be the wild
  97    card MINUS_ONE_PTID (all ptid match it); can be a ptid representing
  98    a process (ptid_is_pid returns true), in which case, all lwps and
  99    threads of that given process match, lwps and threads of other
 100    processes do not; or, it can represent a specific thread, in which
 101    case, only that thread will match true.  PTID must represent a
 102    specific LWP or THREAD, it can never be a wild card.  */
 103
 104 extern int ptid_match (ptid_t ptid, ptid_t filter);
 105
 106 /* Save value of inferior_ptid so that it may be restored by
 107    a later call to do_cleanups().  Returns the struct cleanup
 108    pointer needed for later doing the cleanup.  */
 109 extern struct cleanup * save_inferior_ptid (void);
 110
 111 extern void set_sigint_trap (void);
 112
 113 extern void clear_sigint_trap (void);
 114
 115 /* Set/get file name for default use for standard in/out in the inferior.  */
 116
 117 extern void set_inferior_io_terminal (const char *terminal_name);
 118 extern const char *get_inferior_io_terminal (void);
 119
 120 /* Collected pid, tid, etc. of the debugged inferior.  When there's
 121    no inferior, PIDGET (inferior_ptid) will be 0.  */
 122
 123 extern ptid_t inferior_ptid;
 124
 125 /* Are we simulating synchronous execution? This is used in async gdb
 126    to implement the 'run', 'continue' etc commands, which will not
 127    redisplay the prompt until the execution is actually over.  */
 128 extern int sync_execution;
 129
 130 /* Inferior environment.  */
 131
 132 extern void clear_proceed_status (void);
 133
 134 extern void proceed (CORE_ADDR, enum target_signal, int);
 135
 136 extern int sched_multi;
 137
 138 /* When set, stop the 'step' command if we enter a function which has
 139    no line number information.  The normal behavior is that we step
 140    over such function.  */
 141 extern int step_stop_if_no_debug;
 142
 143 /* If set, the inferior should be controlled in non-stop mode.  In
 144    this mode, each thread is controlled independently.  Execution
 145    commands apply only to the selected thread by default, and stop
 146    events stop only the thread that had the event -- the other threads
 147    are kept running freely.  */
 148 extern int non_stop;
 149
 150 /* If set (default), when following a fork, GDB will detach from one
 151    the fork branches, child or parent.  Exactly which branch is
 152    detached depends on 'set follow-fork-mode' setting.  */
 153 extern int detach_fork;
 154
 155 extern void generic_mourn_inferior (void);
 156
 157 extern void terminal_save_ours (void);
 158
 159 extern void terminal_ours (void);
 160
 161 extern CORE_ADDR unsigned_pointer_to_address (struct gdbarch *gdbarch,
 162                                               struct type *type,
 163                                               const gdb_byte *buf);
 164 extern void unsigned_address_to_pointer (struct gdbarch *gdbarch,
 165                                          struct type *type, gdb_byte *buf,
 166                                          CORE_ADDR addr);
 167 extern CORE_ADDR signed_pointer_to_address (struct gdbarch *gdbarch,
 168                                             struct type *type,
 169                                             const gdb_byte *buf);
 170 extern void address_to_signed_pointer (struct gdbarch *gdbarch,
 171                                        struct type *type, gdb_byte *buf,
 172                                        CORE_ADDR addr);
 173
 174 extern void wait_for_inferior (void);
 175
 176 extern void prepare_for_detach (void);
 177
 178 extern void fetch_inferior_event (void *);
 179
 180 extern void init_wait_for_inferior (void);
 181
 182 extern void close_exec_file (void);
 183
 184 extern void reopen_exec_file (void);
 185
 186 /* The `resume' routine should only be called in special circumstances.
 187    Normally, use `proceed', which handles a lot of bookkeeping.  */
 188
 189 extern void resume (int, enum target_signal);
 190
 191 extern ptid_t user_visible_resume_ptid (int step);
 192
 193 extern void insert_step_resume_breakpoint_at_sal (struct gdbarch *,
 194                                                   struct symtab_and_line ,
 195                                                   struct frame_id);
 196
 197 /* From misc files */
 198
 199 extern void default_print_registers_info (struct gdbarch *gdbarch,
 200                                           struct ui_file *file,
 201                                           struct frame_info *frame,
 202                                           int regnum, int all);
 203
 204 extern void child_terminal_info (char *, int);
 205
 206 extern void term_info (char *, int);
 207
 208 extern void terminal_ours_for_output (void);
 209
 210 extern void terminal_inferior (void);
 211
 212 extern void terminal_init_inferior (void);
 213
 214 extern void terminal_init_inferior_with_pgrp (int pgrp);
 215
 216 /* From fork-child.c */
 217
 218 extern int fork_inferior (char *, char *, char **,
 219                           void (*)(void),
 220                           void (*)(int), void (*)(void), char *);
 221
 222
 223 extern void startup_inferior (int);
 224
 225 extern char *construct_inferior_arguments (int, char **);
 226
 227 /* From infrun.c */
 228
 229 extern int debug_infrun;
 230
 231 extern int stop_on_solib_events;
 232
 233 extern void start_remote (int from_tty);
 234
 235 extern void normal_stop (void);
 236
 237 extern int signal_stop_state (int);
 238
 239 extern int signal_print_state (int);
 240
 241 extern int signal_pass_state (int);
 242
 243 extern int signal_stop_update (int, int);
 244
 245 extern int signal_print_update (int, int);
 246
 247 extern int signal_pass_update (int, int);
 248
 249 extern void get_last_target_status(ptid_t *ptid,
 250                                    struct target_waitstatus *status);
 251
 252 extern void follow_inferior_reset_breakpoints (void);
 253
 254 /* Throw an error indicating the current thread is running.  */
 255 extern void error_is_running (void);
 256
 257 /* Calls error_is_running if the current thread is running.  */
 258 extern void ensure_not_running (void);
 259
 260 void set_step_info (struct frame_info *frame, struct symtab_and_line sal);
 261
 262 /* From infcmd.c */
 263
 264 extern void post_create_inferior (struct target_ops *, int);
 265
 266 extern void attach_command (char *, int);
 267
 268 extern char *get_inferior_args (void);
 269
 270 extern void set_inferior_args (char *);
 271
 272 extern void set_inferior_args_vector (int, char **);
 273
 274 extern void registers_info (char *, int);
 275
 276 extern void nexti_command (char *, int);
 277
 278 extern void stepi_command (char *, int);
 279
 280 extern void continue_1 (int all_threads);
 281
 282 extern void continue_command (char *, int);
 283
 284 extern void interrupt_target_command (char *args, int from_tty);
 285
 286 extern void interrupt_target_1 (int all_threads);
 287
 288 extern void delete_longjmp_breakpoint_cleanup (void *arg);
 289
 290 extern void detach_command (char *, int);
 291
 292 extern void notice_new_inferior (ptid_t, int, int);
 293
 294 /* Address at which inferior stopped.  */
 295
 296 extern CORE_ADDR stop_pc;
 297
 298 /* Nonzero if stopped due to completion of a stack dummy routine.  */
 299
 300 extern enum stop_stack_kind stop_stack_dummy;
 301
 302 /* Nonzero if program stopped due to a random (unexpected) signal in
 303    inferior process.  */
 304
 305 extern int stopped_by_random_signal;
 306
 307 /* STEP_OVER_ALL means step over all subroutine calls.
 308    STEP_OVER_UNDEBUGGABLE means step over calls to undebuggable functions.
 309    STEP_OVER_NONE means don't step over any subroutine calls.  */
 310
 311 enum step_over_calls_kind
 312   {
 313     STEP_OVER_NONE,
 314     STEP_OVER_ALL,
 315     STEP_OVER_UNDEBUGGABLE
 316   };
 317
 318 /* Anything but NO_STOP_QUIETLY means we expect a trap and the caller
 319    will handle it themselves.  STOP_QUIETLY is used when running in
 320    the shell before the child program has been exec'd and when running
 321    through shared library loading.  STOP_QUIETLY_REMOTE is used when
 322    setting up a remote connection; it is like STOP_QUIETLY_NO_SIGSTOP
 323    except that there is no need to hide a signal.  */
 324
 325 /* It is also used after attach, due to attaching to a process.  This
 326    is a bit trickier.  When doing an attach, the kernel stops the
 327    debuggee with a SIGSTOP.  On newer GNU/Linux kernels (>= 2.5.61)
 328    the handling of SIGSTOP for a ptraced process has changed.  Earlier
 329    versions of the kernel would ignore these SIGSTOPs, while now
 330    SIGSTOP is treated like any other signal, i.e. it is not muffled.
 331
 332    If the gdb user does a 'continue' after the 'attach', gdb passes
 333    the global variable stop_signal (which stores the signal from the
 334    attach, SIGSTOP) to the ptrace(PTRACE_CONT,...)  call.  This is
 335    problematic, because the kernel doesn't ignore such SIGSTOP
 336    now.  I.e. it is reported back to gdb, which in turn presents it
 337    back to the user.
 338
 339    To avoid the problem, we use STOP_QUIETLY_NO_SIGSTOP, which allows
 340    gdb to clear the value of stop_signal after the attach, so that it
 341    is not passed back down to the kernel.  */
 342
 343 enum stop_kind
 344   {
 345     NO_STOP_QUIETLY = 0,
 346     STOP_QUIETLY,
 347     STOP_QUIETLY_REMOTE,
 348     STOP_QUIETLY_NO_SIGSTOP
 349   };
 350
 351 /* Reverse execution.  */
 352 enum exec_direction_kind
 353   {
 354     EXEC_FORWARD,
 355     EXEC_REVERSE,
 356     EXEC_ERROR
 357   };
 358
 359 /* The current execution direction.  This should only be set to enum
 360    exec_direction_kind values.  It is only an int to make it
 361    compatible with make_cleanup_restore_integer.  */
 362 extern int execution_direction;
 363
 364 /* Save register contents here when executing a "finish" command or are
 365    about to pop a stack dummy frame, if-and-only-if proceed_to_finish is set.
 366    Thus this contains the return value from the called function (assuming
 367    values are returned in a register).  */
 368
 369 extern struct regcache *stop_registers;
 370
 371 /* True if we are debugging displaced stepping.  */
 372 extern int debug_displaced;
 373
 374 /* Dump LEN bytes at BUF in hex to FILE, followed by a newline.  */
 375 void displaced_step_dump_bytes (struct ui_file *file,
 376                                 const gdb_byte *buf, size_t len);
 377
 378 struct displaced_step_closure *get_displaced_step_closure_by_addr (CORE_ADDR addr);
 379 \f
 380 /* Possible values for gdbarch_call_dummy_location.  */
 381 #define ON_STACK 1
 382 #define AT_ENTRY_POINT 4
 383 #define AT_SYMBOL 5
 384
 385 /* If STARTUP_WITH_SHELL is set, GDB's "run"
 386    will attempts to start up the debugee under a shell.
 387    This is in order for argument-expansion to occur.  E.g.,
 388    (gdb) run *
 389    The "*" gets expanded by the shell into a list of files.
 390    While this is a nice feature, it turns out to interact badly
 391    with some of the catch-fork/catch-exec features we have added.
 392    In particular, if the shell does any fork/exec's before
 393    the exec of the target program, that can confuse GDB.
 394    To disable this feature, set STARTUP_WITH_SHELL to 0.
 395    To enable this feature, set STARTUP_WITH_SHELL to 1.
 396    The catch-exec traps expected during start-up will
 397    be 1 if target is not started up with a shell, 2 if it is.
 398    - RT
 399    If you disable this, you need to decrement
 400    START_INFERIOR_TRAPS_EXPECTED in tm.h.  */
 401 #define STARTUP_WITH_SHELL 1
 402 #if !defined(START_INFERIOR_TRAPS_EXPECTED)
 403 #define START_INFERIOR_TRAPS_EXPECTED   2
 404 #endif
 405
 406 struct private_inferior;
 407
 408 /* Inferior process specific part of `struct infcall_control_state'.
 409
 410    Inferior thread counterpart is `struct thread_control_state'.  */
 411
 412 struct inferior_control_state
 413 {
 414   /* See the definition of stop_kind above.  */
 415   enum stop_kind stop_soon;
 416 };
 417
 418 /* Inferior process specific part of `struct infcall_suspend_state'.
 419
 420    Inferior thread counterpart is `struct thread_suspend_state'.  */
 421
 422 struct inferior_suspend_state
 423 {
 424 };
 425
 426 /* GDB represents the state of each program execution with an object
 427    called an inferior.  An inferior typically corresponds to a process
 428    but is more general and applies also to targets that do not have a
 429    notion of processes.  Each run of an executable creates a new
 430    inferior, as does each attachment to an existing process.
 431    Inferiors have unique internal identifiers that are different from
 432    target process ids.  Each inferior may in turn have multiple
 433    threads running in it.  */
 434
 435 struct inferior
 436 {
 437   /* Pointer to next inferior in singly-linked list of inferiors.  */
 438   struct inferior *next;
 439
 440   /* Convenient handle (GDB inferior id).  Unique across all
 441      inferiors.  */
 442   int num;
 443
 444   /* Actual target inferior id, usually, a process id.  This matches
 445      the ptid_t.pid member of threads of this inferior.  */
 446   int pid;
 447
 448   /* State of GDB control of inferior process execution.
 449      See `struct inferior_control_state'.  */
 450   struct inferior_control_state control;
 451
 452   /* State of inferior process to restore after GDB is done with an inferior
 453      call.  See `struct inferior_suspend_state'.  */
 454   struct inferior_suspend_state suspend;
 455
 456   /* True if this was an auto-created inferior, e.g. created from
 457      following a fork; false, if this inferior was manually added by
 458      the user, and we should not attempt to prune it
 459      automatically.  */
 460   int removable;
 461
 462   /* The address space bound to this inferior.  */
 463   struct address_space *aspace;
 464
 465   /* The program space bound to this inferior.  */
 466   struct program_space *pspace;
 467
 468   /* The arguments string to use when running.  */
 469   char *args;
 470
 471   /* The size of elements in argv.  */
 472   int argc;
 473
 474   /* The vector version of arguments.  If ARGC is nonzero,
 475      then we must compute ARGS from this (via the target).
 476      This is always coming from main's argv and therefore
 477      should never be freed.  */
 478   char **argv;
 479
 480   /* The name of terminal device to use for I/O.  */
 481   char *terminal;
 482
 483   /* Environment to use for running inferior,
 484      in format described in environ.h.  */
 485   struct gdb_environ *environment;
 486
 487   /* Nonzero if this child process was attached rather than
 488      forked.  */
 489   int attach_flag;
 490
 491   /* If this inferior is a vfork child, then this is the pointer to
 492      its vfork parent, if GDB is still attached to it.  */
 493   struct inferior *vfork_parent;
 494
 495   /* If this process is a vfork parent, this is the pointer to the
 496      child.  Since a vfork parent is left frozen by the kernel until
 497      the child execs or exits, a process can only have one vfork child
 498      at a given time.  */
 499   struct inferior *vfork_child;
 500
 501   /* True if this inferior should be detached when it's vfork sibling
 502      exits or execs.  */
 503   int pending_detach;
 504
 505   /* True if this inferior is a vfork parent waiting for a vfork child
 506      not under our control to be done with the shared memory region,
 507      either by exiting or execing.  */
 508   int waiting_for_vfork_done;
 509
 510   /* True if we're in the process of detaching from this inferior.  */
 511   int detaching;
 512
 513   /* What is left to do for an execution command after any thread of
 514      this inferior stops.  For continuations associated with a
 515      specific thread, see `struct thread_info'.  */
 516   struct continuation *continuations;
 517
 518   /* Private data used by the target vector implementation.  */
 519   struct private_inferior *private;
 520
 521   /* We keep a count of the number of times the user has requested a
 522      particular syscall to be tracked, and pass this information to the
 523      target.  This lets capable targets implement filtering directly.  */
 524
 525   /* Number of times that "any" syscall is requested.  */
 526   int any_syscall_count;
 527
 528   /* Count of each system call.  */
 529   VEC(int) *syscalls_counts;
 530
 531   /* This counts all syscall catch requests, so we can readily determine
 532      if any catching is necessary.  */
 533   int total_syscalls_count;
 534
 535   /* Per inferior data-pointers required by other GDB modules.  */
 536   void **data;
 537   unsigned num_data;
 538 };
 539
 540 /* Keep a registry of per-inferior data-pointers required by other GDB
 541    modules.  */
 542
 543 extern const struct inferior_data *register_inferior_data (void);
 544 extern const struct inferior_data *register_inferior_data_with_cleanup
 545   (void (*cleanup) (struct inferior *, void *));
 546 extern void clear_inferior_data (struct inferior *inf);
 547 extern void set_inferior_data (struct inferior *inf,
 548                                const struct inferior_data *data, void *value);
 549 extern void *inferior_data (struct inferior *inf,
 550                             const struct inferior_data *data);
 551
 552 /* Create an empty inferior list, or empty the existing one.  */
 553 extern void init_inferior_list (void);
 554
 555 /* Add an inferior to the inferior list, print a message that a new
 556    inferior is found, and return the pointer to the new inferior.
 557    Caller may use this pointer to initialize the private inferior
 558    data.  */
 559 extern struct inferior *add_inferior (int pid);
 560
 561 /* Same as add_inferior, but don't print new inferior notifications to
 562    the CLI.  */
 563 extern struct inferior *add_inferior_silent (int pid);
 564
 565 /* Delete an existing inferior list entry, due to inferior exit.  */
 566 extern void delete_inferior (int pid);
 567
 568 extern void delete_inferior_1 (struct inferior *todel, int silent);
 569
 570 /* Same as delete_inferior, but don't print new inferior notifications
 571    to the CLI.  */
 572 extern void delete_inferior_silent (int pid);
 573
 574 /* Delete an existing inferior list entry, due to inferior detaching.  */
 575 extern void detach_inferior (int pid);
 576
 577 extern void exit_inferior (int pid);
 578
 579 extern void exit_inferior_silent (int pid);
 580
 581 extern void exit_inferior_num_silent (int num);
 582
 583 extern void inferior_appeared (struct inferior *inf, int pid);
 584
 585 /* Get rid of all inferiors.  */
 586 extern void discard_all_inferiors (void);
 587
 588 /* Translate the integer inferior id (GDB's homegrown id, not the system's)
 589    into a "pid" (which may be overloaded with extra inferior information).  */
 590 extern int gdb_inferior_id_to_pid (int);
 591
 592 /* Translate a target 'pid' into the integer inferior id (GDB's
 593    homegrown id, not the system's).  */
 594 extern int pid_to_gdb_inferior_id (int pid);
 595
 596 /* Boolean test for an already-known pid.  */
 597 extern int in_inferior_list (int pid);
 598
 599 /* Boolean test for an already-known inferior id (GDB's homegrown id,
 600    not the system's).  */
 601 extern int valid_gdb_inferior_id (int num);
 602
 603 /* Search function to lookup an inferior by target 'pid'.  */
 604 extern struct inferior *find_inferior_pid (int pid);
 605
 606 /* Search function to lookup an inferior by GDB 'num'.  */
 607 extern struct inferior *find_inferior_id (int num);
 608
 609 /* Find an inferior bound to PSPACE.  */
 610 extern struct inferior *
 611   find_inferior_for_program_space (struct program_space *pspace);
 612
 613 /* Inferior iterator function.
 614
 615    Calls a callback function once for each inferior, so long as the
 616    callback function returns false.  If the callback function returns
 617    true, the iteration will end and the current inferior will be
 618    returned.  This can be useful for implementing a search for a
 619    inferior with arbitrary attributes, or for applying some operation
 620    to every inferior.
 621
 622    It is safe to delete the iterated inferior from the callback.  */
 623 extern struct inferior *iterate_over_inferiors (int (*) (struct inferior *,
 624                                                          void *),
 625                                                 void *);
 626
 627 /* Returns true if the inferior list is not empty.  */
 628 extern int have_inferiors (void);
 629
 630 /* Returns true if there are any live inferiors in the inferior list
 631    (not cores, not executables, real live processes).  */
 632 extern int have_live_inferiors (void);
 633
 634 /* Return a pointer to the current inferior.  It is an error to call
 635    this if there is no current inferior.  */
 636 extern struct inferior *current_inferior (void);
 637
 638 extern void set_current_inferior (struct inferior *);
 639
 640 extern struct cleanup *save_current_inferior (void);
 641
 642 extern struct inferior *inferior_list;
 643
 644 /* Prune away automatically added inferiors that aren't required
 645    anymore.  */
 646 extern void prune_inferiors (void);
 647
 648 extern int number_of_inferiors (void);
 649
 650 extern struct inferior *add_inferior_with_spaces (void);
 651
 652 extern void update_observer_mode (void);
 653
 654 #endif /* !defined (INFERIOR_H) */