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) 1986-2015 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 /* For bpstat.  */
  35 #include "breakpoint.h"
  36
  37 /* For enum gdb_signal.  */
  38 #include "target.h"
  39
  40 /* For struct frame_id.  */
  41 #include "frame.h"
  42
  43 #include "progspace.h"
  44 #include "registry.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 /* Save value of inferior_ptid so that it may be restored by
  67    a later call to do_cleanups().  Returns the struct cleanup
  68    pointer needed for later doing the cleanup.  */
  69 extern struct cleanup * save_inferior_ptid (void);
  70
  71 extern void set_sigint_trap (void);
  72
  73 extern void clear_sigint_trap (void);
  74
  75 /* Set/get file name for default use for standard in/out in the inferior.  */
  76
  77 extern void set_inferior_io_terminal (const char *terminal_name);
  78 extern const char *get_inferior_io_terminal (void);
  79
  80 /* Collected pid, tid, etc. of the debugged inferior.  When there's
  81    no inferior, ptid_get_pid (inferior_ptid) will be 0.  */
  82
  83 extern ptid_t inferior_ptid;
  84
  85 extern void generic_mourn_inferior (void);
  86
  87 extern CORE_ADDR unsigned_pointer_to_address (struct gdbarch *gdbarch,
  88                                               struct type *type,
  89                                               const gdb_byte *buf);
  90 extern void unsigned_address_to_pointer (struct gdbarch *gdbarch,
  91                                          struct type *type, gdb_byte *buf,
  92                                          CORE_ADDR addr);
  93 extern CORE_ADDR signed_pointer_to_address (struct gdbarch *gdbarch,
  94                                             struct type *type,
  95                                             const gdb_byte *buf);
  96 extern void address_to_signed_pointer (struct gdbarch *gdbarch,
  97                                        struct type *type, gdb_byte *buf,
  98                                        CORE_ADDR addr);
  99
 100 extern void reopen_exec_file (void);
 101
 102 /* From misc files */
 103
 104 extern void default_print_registers_info (struct gdbarch *gdbarch,
 105                                           struct ui_file *file,
 106                                           struct frame_info *frame,
 107                                           int regnum, int all);
 108
 109 /* Default implementation of gdbarch_print_float_info.  Print
 110    the values of all floating point registers.  */
 111
 112 extern void default_print_float_info (struct gdbarch *gdbarch,
 113                                       struct ui_file *file,
 114                                       struct frame_info *frame,
 115                                       const char *args);
 116
 117 extern void child_terminal_info (struct target_ops *self, const char *, int);
 118
 119 extern void term_info (char *, int);
 120
 121 extern void child_terminal_ours (struct target_ops *self);
 122
 123 extern void child_terminal_ours_for_output (struct target_ops *self);
 124
 125 extern void child_terminal_inferior (struct target_ops *self);
 126
 127 extern void child_terminal_init (struct target_ops *self);
 128
 129 extern void child_terminal_init_with_pgrp (int pgrp);
 130
 131 /* From fork-child.c */
 132
 133 extern int fork_inferior (char *, char *, char **,
 134                           void (*)(void),
 135                           void (*)(int), void (*)(void), char *,
 136                           void (*)(const char *,
 137                                    char * const *, char * const *));
 138
 139
 140 extern void startup_inferior (int);
 141
 142 extern char *construct_inferior_arguments (int, char **);
 143
 144 /* From infcmd.c */
 145
 146 extern void post_create_inferior (struct target_ops *, int);
 147
 148 extern void attach_command (char *, int);
 149
 150 extern char *get_inferior_args (void);
 151
 152 extern void set_inferior_args (char *);
 153
 154 extern void set_inferior_args_vector (int, char **);
 155
 156 extern void registers_info (char *, int);
 157
 158 extern void continue_1 (int all_threads);
 159
 160 extern void interrupt_target_1 (int all_threads);
 161
 162 extern void delete_longjmp_breakpoint_cleanup (void *arg);
 163
 164 extern void detach_command (char *, int);
 165
 166 extern void notice_new_inferior (ptid_t, int, int);
 167
 168 struct dummy_frame_context_saver;
 169 extern struct value *get_return_value
 170   (struct value *function, struct type *value_type,
 171    struct dummy_frame_context_saver *ctx_saver);
 172
 173 /* Prepare for execution command.  TARGET is the target that will run
 174    the command.  BACKGROUND determines whether this is a foreground
 175    (synchronous) or background (asynchronous) command.  */
 176
 177 extern void prepare_execution_command (struct target_ops *target,
 178                                        int background);
 179
 180 /* Whether to start up the debuggee under a shell.
 181
 182    If startup-with-shell is set, GDB's "run" will attempt to start up
 183    the debuggee under a shell.
 184
 185    This is in order for argument-expansion to occur.  E.g.,
 186
 187    (gdb) run *
 188
 189    The "*" gets expanded by the shell into a list of files.
 190
 191    While this is a nice feature, it may be handy to bypass the shell
 192    in some cases.  To disable this feature, do "set startup-with-shell
 193    false".
 194
 195    The catch-exec traps expected during start-up will be one more if
 196    the target is started up with a shell.  */
 197 extern int startup_with_shell;
 198
 199 /* Address at which inferior stopped.  */
 200
 201 extern CORE_ADDR stop_pc;
 202
 203 /* Nonzero if stopped due to completion of a stack dummy routine.  */
 204
 205 extern enum stop_stack_kind stop_stack_dummy;
 206
 207 /* Nonzero if program stopped due to a random (unexpected) signal in
 208    inferior process.  */
 209
 210 extern int stopped_by_random_signal;
 211
 212 /* STEP_OVER_ALL means step over all subroutine calls.
 213    STEP_OVER_UNDEBUGGABLE means step over calls to undebuggable functions.
 214    STEP_OVER_NONE means don't step over any subroutine calls.  */
 215
 216 enum step_over_calls_kind
 217   {
 218     STEP_OVER_NONE,
 219     STEP_OVER_ALL,
 220     STEP_OVER_UNDEBUGGABLE
 221   };
 222
 223 /* Anything but NO_STOP_QUIETLY means we expect a trap and the caller
 224    will handle it themselves.  STOP_QUIETLY is used when running in
 225    the shell before the child program has been exec'd and when running
 226    through shared library loading.  STOP_QUIETLY_REMOTE is used when
 227    setting up a remote connection; it is like STOP_QUIETLY_NO_SIGSTOP
 228    except that there is no need to hide a signal.  */
 229
 230 /* STOP_QUIETLY_NO_SIGSTOP is used to handle a tricky situation with attach.
 231    When doing an attach, the kernel stops the debuggee with a SIGSTOP.
 232    On newer GNU/Linux kernels (>= 2.5.61) the handling of SIGSTOP for
 233    a ptraced process has changed.  Earlier versions of the kernel
 234    would ignore these SIGSTOPs, while now SIGSTOP is treated like any
 235    other signal, i.e. it is not muffled.
 236
 237    If the gdb user does a 'continue' after the 'attach', gdb passes
 238    the global variable stop_signal (which stores the signal from the
 239    attach, SIGSTOP) to the ptrace(PTRACE_CONT,...)  call.  This is
 240    problematic, because the kernel doesn't ignore such SIGSTOP
 241    now.  I.e. it is reported back to gdb, which in turn presents it
 242    back to the user.
 243
 244    To avoid the problem, we use STOP_QUIETLY_NO_SIGSTOP, which allows
 245    gdb to clear the value of stop_signal after the attach, so that it
 246    is not passed back down to the kernel.  */
 247
 248 enum stop_kind
 249   {
 250     NO_STOP_QUIETLY = 0,
 251     STOP_QUIETLY,
 252     STOP_QUIETLY_REMOTE,
 253     STOP_QUIETLY_NO_SIGSTOP
 254   };
 255
 256 \f
 257 /* Possible values for gdbarch_call_dummy_location.  */
 258 #define ON_STACK 1
 259 #define AT_ENTRY_POINT 4
 260
 261 /* Number of traps that happen between exec'ing the shell to run an
 262    inferior and when we finally get to the inferior code, not counting
 263    the exec for the shell.  This is 1 on all supported
 264    implementations.  */
 265 #define START_INFERIOR_TRAPS_EXPECTED   1
 266
 267 struct private_inferior;
 268
 269 /* Inferior process specific part of `struct infcall_control_state'.
 270
 271    Inferior thread counterpart is `struct thread_control_state'.  */
 272
 273 struct inferior_control_state
 274 {
 275   /* See the definition of stop_kind above.  */
 276   enum stop_kind stop_soon;
 277 };
 278
 279 /* Inferior process specific part of `struct infcall_suspend_state'.
 280
 281    Inferior thread counterpart is `struct thread_suspend_state'.  */
 282
 283 #if 0 /* Currently unused and empty structures are not valid C.  */
 284 struct inferior_suspend_state
 285 {
 286 };
 287 #endif
 288
 289 /* GDB represents the state of each program execution with an object
 290    called an inferior.  An inferior typically corresponds to a process
 291    but is more general and applies also to targets that do not have a
 292    notion of processes.  Each run of an executable creates a new
 293    inferior, as does each attachment to an existing process.
 294    Inferiors have unique internal identifiers that are different from
 295    target process ids.  Each inferior may in turn have multiple
 296    threads running in it.  */
 297
 298 struct inferior
 299 {
 300   /* Pointer to next inferior in singly-linked list of inferiors.  */
 301   struct inferior *next;
 302
 303   /* Convenient handle (GDB inferior id).  Unique across all
 304      inferiors.  */
 305   int num;
 306
 307   /* Actual target inferior id, usually, a process id.  This matches
 308      the ptid_t.pid member of threads of this inferior.  */
 309   int pid;
 310   /* True if the PID was actually faked by GDB.  */
 311   int fake_pid_p;
 312
 313   /* State of GDB control of inferior process execution.
 314      See `struct inferior_control_state'.  */
 315   struct inferior_control_state control;
 316
 317   /* State of inferior process to restore after GDB is done with an inferior
 318      call.  See `struct inferior_suspend_state'.  */
 319 #if 0 /* Currently unused and empty structures are not valid C.  */
 320   struct inferior_suspend_state suspend;
 321 #endif
 322
 323   /* True if this was an auto-created inferior, e.g. created from
 324      following a fork; false, if this inferior was manually added by
 325      the user, and we should not attempt to prune it
 326      automatically.  */
 327   int removable;
 328
 329   /* The address space bound to this inferior.  */
 330   struct address_space *aspace;
 331
 332   /* The program space bound to this inferior.  */
 333   struct program_space *pspace;
 334
 335   /* The arguments string to use when running.  */
 336   char *args;
 337
 338   /* The size of elements in argv.  */
 339   int argc;
 340
 341   /* The vector version of arguments.  If ARGC is nonzero,
 342      then we must compute ARGS from this (via the target).
 343      This is always coming from main's argv and therefore
 344      should never be freed.  */
 345   char **argv;
 346
 347   /* The name of terminal device to use for I/O.  */
 348   char *terminal;
 349
 350   /* Environment to use for running inferior,
 351      in format described in environ.h.  */
 352   struct gdb_environ *environment;
 353
 354   /* Nonzero if this child process was attached rather than
 355      forked.  */
 356   int attach_flag;
 357
 358   /* If this inferior is a vfork child, then this is the pointer to
 359      its vfork parent, if GDB is still attached to it.  */
 360   struct inferior *vfork_parent;
 361
 362   /* If this process is a vfork parent, this is the pointer to the
 363      child.  Since a vfork parent is left frozen by the kernel until
 364      the child execs or exits, a process can only have one vfork child
 365      at a given time.  */
 366   struct inferior *vfork_child;
 367
 368   /* True if this inferior should be detached when it's vfork sibling
 369      exits or execs.  */
 370   int pending_detach;
 371
 372   /* True if this inferior is a vfork parent waiting for a vfork child
 373      not under our control to be done with the shared memory region,
 374      either by exiting or execing.  */
 375   int waiting_for_vfork_done;
 376
 377   /* True if we're in the process of detaching from this inferior.  */
 378   int detaching;
 379
 380   /* What is left to do for an execution command after any thread of
 381      this inferior stops.  For continuations associated with a
 382      specific thread, see `struct thread_info'.  */
 383   struct continuation *continuations;
 384
 385   /* Private data used by the target vector implementation.  */
 386   struct private_inferior *priv;
 387
 388   /* HAS_EXIT_CODE is true if the inferior exited with an exit code.
 389      In this case, the EXIT_CODE field is also valid.  */
 390   int has_exit_code;
 391   LONGEST exit_code;
 392
 393   /* Default flags to pass to the symbol reading functions.  These are
 394      used whenever a new objfile is created.  The valid values come
 395      from enum symfile_add_flags.  */
 396   int symfile_flags;
 397
 398   /* Info about an inferior's target description (if it's fetched; the
 399      user supplied description's filename, if any; etc.).  */
 400   struct target_desc_info *tdesc_info;
 401
 402   /* The architecture associated with the inferior through the
 403      connection to the target.
 404
 405      The architecture vector provides some information that is really
 406      a property of the inferior, accessed through a particular target:
 407      ptrace operations; the layout of certain RSP packets; the
 408      solib_ops vector; etc.  To differentiate architecture accesses to
 409      per-inferior/target properties from
 410      per-thread/per-frame/per-objfile properties, accesses to
 411      per-inferior/target properties should be made through
 412      this gdbarch.  */
 413   struct gdbarch *gdbarch;
 414
 415   /* Per inferior data-pointers required by other GDB modules.  */
 416   REGISTRY_FIELDS;
 417 };
 418
 419 /* Keep a registry of per-inferior data-pointers required by other GDB
 420    modules.  */
 421
 422 DECLARE_REGISTRY (inferior);
 423
 424 /* Create an empty inferior list, or empty the existing one.  */
 425 extern void init_inferior_list (void);
 426
 427 /* Add an inferior to the inferior list, print a message that a new
 428    inferior is found, and return the pointer to the new inferior.
 429    Caller may use this pointer to initialize the private inferior
 430    data.  */
 431 extern struct inferior *add_inferior (int pid);
 432
 433 /* Same as add_inferior, but don't print new inferior notifications to
 434    the CLI.  */
 435 extern struct inferior *add_inferior_silent (int pid);
 436
 437 /* Delete an existing inferior list entry, due to inferior exit.  */
 438 extern void delete_inferior (int pid);
 439
 440 extern void delete_inferior_1 (struct inferior *todel, int silent);
 441
 442 /* Same as delete_inferior, but don't print new inferior notifications
 443    to the CLI.  */
 444 extern void delete_inferior_silent (int pid);
 445
 446 /* Delete an existing inferior list entry, due to inferior detaching.  */
 447 extern void detach_inferior (int pid);
 448
 449 extern void exit_inferior (int pid);
 450
 451 extern void exit_inferior_silent (int pid);
 452
 453 extern void exit_inferior_num_silent (int num);
 454
 455 extern void inferior_appeared (struct inferior *inf, int pid);
 456
 457 /* Get rid of all inferiors.  */
 458 extern void discard_all_inferiors (void);
 459
 460 /* Translate the integer inferior id (GDB's homegrown id, not the system's)
 461    into a "pid" (which may be overloaded with extra inferior information).  */
 462 extern int gdb_inferior_id_to_pid (int);
 463
 464 /* Translate a target 'pid' into the integer inferior id (GDB's
 465    homegrown id, not the system's).  */
 466 extern int pid_to_gdb_inferior_id (int pid);
 467
 468 /* Boolean test for an already-known pid.  */
 469 extern int in_inferior_list (int pid);
 470
 471 /* Boolean test for an already-known inferior id (GDB's homegrown id,
 472    not the system's).  */
 473 extern int valid_gdb_inferior_id (int num);
 474
 475 /* Search function to lookup an inferior by target 'pid'.  */
 476 extern struct inferior *find_inferior_pid (int pid);
 477
 478 /* Search function to lookup an inferior whose pid is equal to 'ptid.pid'. */
 479 extern struct inferior *find_inferior_ptid (ptid_t ptid);
 480
 481 /* Search function to lookup an inferior by GDB 'num'.  */
 482 extern struct inferior *find_inferior_id (int num);
 483
 484 /* Find an inferior bound to PSPACE, giving preference to the current
 485    inferior.  */
 486 extern struct inferior *
 487   find_inferior_for_program_space (struct program_space *pspace);
 488
 489 /* Inferior iterator function.
 490
 491    Calls a callback function once for each inferior, so long as the
 492    callback function returns false.  If the callback function returns
 493    true, the iteration will end and the current inferior will be
 494    returned.  This can be useful for implementing a search for a
 495    inferior with arbitrary attributes, or for applying some operation
 496    to every inferior.
 497
 498    It is safe to delete the iterated inferior from the callback.  */
 499 extern struct inferior *iterate_over_inferiors (int (*) (struct inferior *,
 500                                                          void *),
 501                                                 void *);
 502
 503 /* Returns true if the inferior list is not empty.  */
 504 extern int have_inferiors (void);
 505
 506 /* Returns true if there are any live inferiors in the inferior list
 507    (not cores, not executables, real live processes).  */
 508 extern int have_live_inferiors (void);
 509
 510 /* Return a pointer to the current inferior.  It is an error to call
 511    this if there is no current inferior.  */
 512 extern struct inferior *current_inferior (void);
 513
 514 extern void set_current_inferior (struct inferior *);
 515
 516 extern struct cleanup *save_current_inferior (void);
 517
 518 /* Traverse all inferiors.  */
 519
 520 #define ALL_INFERIORS(I) \
 521   for ((I) = inferior_list; (I); (I) = (I)->next)
 522
 523 extern struct inferior *inferior_list;
 524
 525 /* Prune away automatically added inferiors that aren't required
 526    anymore.  */
 527 extern void prune_inferiors (void);
 528
 529 extern int number_of_inferiors (void);
 530
 531 extern struct inferior *add_inferior_with_spaces (void);
 532
 533 #endif /* !defined (INFERIOR_H) */