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) 1986-2014 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 /* Save value of inferior_ptid so that it may be restored by
  69    a later call to do_cleanups().  Returns the struct cleanup
  70    pointer needed for later doing the cleanup.  */
  71 extern struct cleanup * save_inferior_ptid (void);
  72
  73 extern void set_sigint_trap (void);
  74
  75 extern void clear_sigint_trap (void);
  76
  77 /* Set/get file name for default use for standard in/out in the inferior.  */
  78
  79 extern void set_inferior_io_terminal (const char *terminal_name);
  80 extern const char *get_inferior_io_terminal (void);
  81
  82 /* Collected pid, tid, etc. of the debugged inferior.  When there's
  83    no inferior, ptid_get_pid (inferior_ptid) will be 0.  */
  84
  85 extern ptid_t inferior_ptid;
  86
  87 extern void generic_mourn_inferior (void);
  88
  89 extern CORE_ADDR unsigned_pointer_to_address (struct gdbarch *gdbarch,
  90                                               struct type *type,
  91                                               const gdb_byte *buf);
  92 extern void unsigned_address_to_pointer (struct gdbarch *gdbarch,
  93                                          struct type *type, gdb_byte *buf,
  94                                          CORE_ADDR addr);
  95 extern CORE_ADDR signed_pointer_to_address (struct gdbarch *gdbarch,
  96                                             struct type *type,
  97                                             const gdb_byte *buf);
  98 extern void address_to_signed_pointer (struct gdbarch *gdbarch,
  99                                        struct type *type, gdb_byte *buf,
 100                                        CORE_ADDR addr);
 101
 102 extern void reopen_exec_file (void);
 103
 104 /* From misc files */
 105
 106 extern void default_print_registers_info (struct gdbarch *gdbarch,
 107                                           struct ui_file *file,
 108                                           struct frame_info *frame,
 109                                           int regnum, int all);
 110
 111 extern void child_terminal_info (struct target_ops *self, const char *, int);
 112
 113 extern void term_info (char *, int);
 114
 115 extern void child_terminal_save_ours (struct target_ops *self);
 116
 117 extern void child_terminal_ours (struct target_ops *self);
 118
 119 extern void child_terminal_ours_for_output (struct target_ops *self);
 120
 121 extern void child_terminal_inferior (struct target_ops *self);
 122
 123 extern void child_terminal_init (struct target_ops *self);
 124
 125 extern void child_terminal_init_with_pgrp (int pgrp);
 126
 127 /* From fork-child.c */
 128
 129 extern int fork_inferior (char *, char *, char **,
 130                           void (*)(void),
 131                           void (*)(int), void (*)(void), char *,
 132                           void (*)(const char *,
 133                                    char * const *, char * const *));
 134
 135
 136 extern void startup_inferior (int);
 137
 138 extern char *construct_inferior_arguments (int, char **);
 139
 140 /* From infcmd.c */
 141
 142 extern void post_create_inferior (struct target_ops *, int);
 143
 144 extern void attach_command (char *, int);
 145
 146 extern char *get_inferior_args (void);
 147
 148 extern void set_inferior_args (char *);
 149
 150 extern void set_inferior_args_vector (int, char **);
 151
 152 extern void registers_info (char *, int);
 153
 154 extern void continue_1 (int all_threads);
 155
 156 extern void interrupt_target_1 (int all_threads);
 157
 158 extern void delete_longjmp_breakpoint_cleanup (void *arg);
 159
 160 extern void detach_command (char *, int);
 161
 162 extern void notice_new_inferior (ptid_t, int, int);
 163
 164 extern struct value *get_return_value (struct value *function,
 165                                        struct type *value_type);
 166
 167 /* Prepare for execution command.  TARGET is the target that will run
 168    the command.  BACKGROUND determines whether this is a foreground
 169    (synchronous) or background (asynchronous) command.  */
 170
 171 extern void prepare_execution_command (struct target_ops *target,
 172                                        int background);
 173
 174 /* Whether to start up the debuggee under a shell.
 175
 176    If startup-with-shell is set, GDB's "run" will attempt to start up
 177    the debuggee under a shell.
 178
 179    This is in order for argument-expansion to occur.  E.g.,
 180
 181    (gdb) run *
 182
 183    The "*" gets expanded by the shell into a list of files.
 184
 185    While this is a nice feature, it may be handy to bypass the shell
 186    in some cases.  To disable this feature, do "set startup-with-shell
 187    false".
 188
 189    The catch-exec traps expected during start-up will be one more if
 190    the target is started up with a shell.  */
 191 extern int startup_with_shell;
 192
 193 /* Address at which inferior stopped.  */
 194
 195 extern CORE_ADDR stop_pc;
 196
 197 /* Nonzero if stopped due to completion of a stack dummy routine.  */
 198
 199 extern enum stop_stack_kind stop_stack_dummy;
 200
 201 /* Nonzero if program stopped due to a random (unexpected) signal in
 202    inferior process.  */
 203
 204 extern int stopped_by_random_signal;
 205
 206 /* STEP_OVER_ALL means step over all subroutine calls.
 207    STEP_OVER_UNDEBUGGABLE means step over calls to undebuggable functions.
 208    STEP_OVER_NONE means don't step over any subroutine calls.  */
 209
 210 enum step_over_calls_kind
 211   {
 212     STEP_OVER_NONE,
 213     STEP_OVER_ALL,
 214     STEP_OVER_UNDEBUGGABLE
 215   };
 216
 217 /* Anything but NO_STOP_QUIETLY means we expect a trap and the caller
 218    will handle it themselves.  STOP_QUIETLY is used when running in
 219    the shell before the child program has been exec'd and when running
 220    through shared library loading.  STOP_QUIETLY_REMOTE is used when
 221    setting up a remote connection; it is like STOP_QUIETLY_NO_SIGSTOP
 222    except that there is no need to hide a signal.  */
 223
 224 /* STOP_QUIETLY_NO_SIGSTOP is used to handle a tricky situation with attach.
 225    When doing an attach, the kernel stops the debuggee with a SIGSTOP.
 226    On newer GNU/Linux kernels (>= 2.5.61) the handling of SIGSTOP for
 227    a ptraced process has changed.  Earlier versions of the kernel
 228    would ignore these SIGSTOPs, while now SIGSTOP is treated like any
 229    other signal, i.e. it is not muffled.
 230
 231    If the gdb user does a 'continue' after the 'attach', gdb passes
 232    the global variable stop_signal (which stores the signal from the
 233    attach, SIGSTOP) to the ptrace(PTRACE_CONT,...)  call.  This is
 234    problematic, because the kernel doesn't ignore such SIGSTOP
 235    now.  I.e. it is reported back to gdb, which in turn presents it
 236    back to the user.
 237
 238    To avoid the problem, we use STOP_QUIETLY_NO_SIGSTOP, which allows
 239    gdb to clear the value of stop_signal after the attach, so that it
 240    is not passed back down to the kernel.  */
 241
 242 enum stop_kind
 243   {
 244     NO_STOP_QUIETLY = 0,
 245     STOP_QUIETLY,
 246     STOP_QUIETLY_REMOTE,
 247     STOP_QUIETLY_NO_SIGSTOP
 248   };
 249
 250 \f
 251 /* Possible values for gdbarch_call_dummy_location.  */
 252 #define ON_STACK 1
 253 #define AT_ENTRY_POINT 4
 254
 255 /* Number of traps that happen between exec'ing the shell to run an
 256    inferior and when we finally get to the inferior code, not counting
 257    the exec for the shell.  This is 1 on most implementations.
 258    Overridden in nm.h files.  */
 259 #if !defined(START_INFERIOR_TRAPS_EXPECTED)
 260 #define START_INFERIOR_TRAPS_EXPECTED   1
 261 #endif
 262
 263 struct private_inferior;
 264
 265 /* Inferior process specific part of `struct infcall_control_state'.
 266
 267    Inferior thread counterpart is `struct thread_control_state'.  */
 268
 269 struct inferior_control_state
 270 {
 271   /* See the definition of stop_kind above.  */
 272   enum stop_kind stop_soon;
 273 };
 274
 275 /* Inferior process specific part of `struct infcall_suspend_state'.
 276
 277    Inferior thread counterpart is `struct thread_suspend_state'.  */
 278
 279 #if 0 /* Currently unused and empty structures are not valid C.  */
 280 struct inferior_suspend_state
 281 {
 282 };
 283 #endif
 284
 285 /* GDB represents the state of each program execution with an object
 286    called an inferior.  An inferior typically corresponds to a process
 287    but is more general and applies also to targets that do not have a
 288    notion of processes.  Each run of an executable creates a new
 289    inferior, as does each attachment to an existing process.
 290    Inferiors have unique internal identifiers that are different from
 291    target process ids.  Each inferior may in turn have multiple
 292    threads running in it.  */
 293
 294 struct inferior
 295 {
 296   /* Pointer to next inferior in singly-linked list of inferiors.  */
 297   struct inferior *next;
 298
 299   /* Convenient handle (GDB inferior id).  Unique across all
 300      inferiors.  */
 301   int num;
 302
 303   /* Actual target inferior id, usually, a process id.  This matches
 304      the ptid_t.pid member of threads of this inferior.  */
 305   int pid;
 306   /* True if the PID was actually faked by GDB.  */
 307   int fake_pid_p;
 308
 309   /* State of GDB control of inferior process execution.
 310      See `struct inferior_control_state'.  */
 311   struct inferior_control_state control;
 312
 313   /* State of inferior process to restore after GDB is done with an inferior
 314      call.  See `struct inferior_suspend_state'.  */
 315 #if 0 /* Currently unused and empty structures are not valid C.  */
 316   struct inferior_suspend_state suspend;
 317 #endif
 318
 319   /* True if this was an auto-created inferior, e.g. created from
 320      following a fork; false, if this inferior was manually added by
 321      the user, and we should not attempt to prune it
 322      automatically.  */
 323   int removable;
 324
 325   /* The address space bound to this inferior.  */
 326   struct address_space *aspace;
 327
 328   /* The program space bound to this inferior.  */
 329   struct program_space *pspace;
 330
 331   /* The arguments string to use when running.  */
 332   char *args;
 333
 334   /* The size of elements in argv.  */
 335   int argc;
 336
 337   /* The vector version of arguments.  If ARGC is nonzero,
 338      then we must compute ARGS from this (via the target).
 339      This is always coming from main's argv and therefore
 340      should never be freed.  */
 341   char **argv;
 342
 343   /* The name of terminal device to use for I/O.  */
 344   char *terminal;
 345
 346   /* Environment to use for running inferior,
 347      in format described in environ.h.  */
 348   struct gdb_environ *environment;
 349
 350   /* Nonzero if this child process was attached rather than
 351      forked.  */
 352   int attach_flag;
 353
 354   /* If this inferior is a vfork child, then this is the pointer to
 355      its vfork parent, if GDB is still attached to it.  */
 356   struct inferior *vfork_parent;
 357
 358   /* If this process is a vfork parent, this is the pointer to the
 359      child.  Since a vfork parent is left frozen by the kernel until
 360      the child execs or exits, a process can only have one vfork child
 361      at a given time.  */
 362   struct inferior *vfork_child;
 363
 364   /* True if this inferior should be detached when it's vfork sibling
 365      exits or execs.  */
 366   int pending_detach;
 367
 368   /* True if this inferior is a vfork parent waiting for a vfork child
 369      not under our control to be done with the shared memory region,
 370      either by exiting or execing.  */
 371   int waiting_for_vfork_done;
 372
 373   /* True if we're in the process of detaching from this inferior.  */
 374   int detaching;
 375
 376   /* What is left to do for an execution command after any thread of
 377      this inferior stops.  For continuations associated with a
 378      specific thread, see `struct thread_info'.  */
 379   struct continuation *continuations;
 380
 381   /* Private data used by the target vector implementation.  */
 382   struct private_inferior *private;
 383
 384   /* HAS_EXIT_CODE is true if the inferior exited with an exit code.
 385      In this case, the EXIT_CODE field is also valid.  */
 386   int has_exit_code;
 387   LONGEST exit_code;
 388
 389   /* Default flags to pass to the symbol reading functions.  These are
 390      used whenever a new objfile is created.  The valid values come
 391      from enum symfile_add_flags.  */
 392   int symfile_flags;
 393
 394   /* Info about an inferior's target description (if it's fetched; the
 395      user supplied description's filename, if any; etc.).  */
 396   struct target_desc_info *tdesc_info;
 397
 398   /* The architecture associated with the inferior through the
 399      connection to the target.
 400
 401      The architecture vector provides some information that is really
 402      a property of the inferior, accessed through a particular target:
 403      ptrace operations; the layout of certain RSP packets; the
 404      solib_ops vector; etc.  To differentiate architecture accesses to
 405      per-inferior/target properties from
 406      per-thread/per-frame/per-objfile properties, accesses to
 407      per-inferior/target properties should be made through
 408      this gdbarch.  */
 409   struct gdbarch *gdbarch;
 410
 411   /* Per inferior data-pointers required by other GDB modules.  */
 412   REGISTRY_FIELDS;
 413 };
 414
 415 /* Keep a registry of per-inferior data-pointers required by other GDB
 416    modules.  */
 417
 418 DECLARE_REGISTRY (inferior);
 419
 420 /* Create an empty inferior list, or empty the existing one.  */
 421 extern void init_inferior_list (void);
 422
 423 /* Add an inferior to the inferior list, print a message that a new
 424    inferior is found, and return the pointer to the new inferior.
 425    Caller may use this pointer to initialize the private inferior
 426    data.  */
 427 extern struct inferior *add_inferior (int pid);
 428
 429 /* Same as add_inferior, but don't print new inferior notifications to
 430    the CLI.  */
 431 extern struct inferior *add_inferior_silent (int pid);
 432
 433 /* Delete an existing inferior list entry, due to inferior exit.  */
 434 extern void delete_inferior (int pid);
 435
 436 extern void delete_inferior_1 (struct inferior *todel, int silent);
 437
 438 /* Same as delete_inferior, but don't print new inferior notifications
 439    to the CLI.  */
 440 extern void delete_inferior_silent (int pid);
 441
 442 /* Delete an existing inferior list entry, due to inferior detaching.  */
 443 extern void detach_inferior (int pid);
 444
 445 extern void exit_inferior (int pid);
 446
 447 extern void exit_inferior_silent (int pid);
 448
 449 extern void exit_inferior_num_silent (int num);
 450
 451 extern void inferior_appeared (struct inferior *inf, int pid);
 452
 453 /* Get rid of all inferiors.  */
 454 extern void discard_all_inferiors (void);
 455
 456 /* Translate the integer inferior id (GDB's homegrown id, not the system's)
 457    into a "pid" (which may be overloaded with extra inferior information).  */
 458 extern int gdb_inferior_id_to_pid (int);
 459
 460 /* Translate a target 'pid' into the integer inferior id (GDB's
 461    homegrown id, not the system's).  */
 462 extern int pid_to_gdb_inferior_id (int pid);
 463
 464 /* Boolean test for an already-known pid.  */
 465 extern int in_inferior_list (int pid);
 466
 467 /* Boolean test for an already-known inferior id (GDB's homegrown id,
 468    not the system's).  */
 469 extern int valid_gdb_inferior_id (int num);
 470
 471 /* Search function to lookup an inferior by target 'pid'.  */
 472 extern struct inferior *find_inferior_pid (int pid);
 473
 474 /* Search function to lookup an inferior by GDB 'num'.  */
 475 extern struct inferior *find_inferior_id (int num);
 476
 477 /* Find an inferior bound to PSPACE.  */
 478 extern struct inferior *
 479   find_inferior_for_program_space (struct program_space *pspace);
 480
 481 /* Inferior iterator function.
 482
 483    Calls a callback function once for each inferior, so long as the
 484    callback function returns false.  If the callback function returns
 485    true, the iteration will end and the current inferior will be
 486    returned.  This can be useful for implementing a search for a
 487    inferior with arbitrary attributes, or for applying some operation
 488    to every inferior.
 489
 490    It is safe to delete the iterated inferior from the callback.  */
 491 extern struct inferior *iterate_over_inferiors (int (*) (struct inferior *,
 492                                                          void *),
 493                                                 void *);
 494
 495 /* Returns true if the inferior list is not empty.  */
 496 extern int have_inferiors (void);
 497
 498 /* Returns true if there are any live inferiors in the inferior list
 499    (not cores, not executables, real live processes).  */
 500 extern int have_live_inferiors (void);
 501
 502 /* Return a pointer to the current inferior.  It is an error to call
 503    this if there is no current inferior.  */
 504 extern struct inferior *current_inferior (void);
 505
 506 extern void set_current_inferior (struct inferior *);
 507
 508 extern struct cleanup *save_current_inferior (void);
 509
 510 /* Traverse all inferiors.  */
 511
 512 #define ALL_INFERIORS(I) \
 513   for ((I) = inferior_list; (I); (I) = (I)->next)
 514
 515 extern struct inferior *inferior_list;
 516
 517 /* Prune away automatically added inferiors that aren't required
 518    anymore.  */
 519 extern void prune_inferiors (void);
 520
 521 extern int number_of_inferiors (void);
 522
 523 extern struct inferior *add_inferior_with_spaces (void);
 524
 525 #endif /* !defined (INFERIOR_H) */