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) 1986-2016 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 /* Initial inferior setup.  Determines the exec file is not yet known,
 147    takes any necessary post-attaching actions, fetches the target
 148    description and syncs the shared library list.  */
 149
 150 extern void setup_inferior (int from_tty);
 151
 152 extern void post_create_inferior (struct target_ops *, int);
 153
 154 extern void attach_command (char *, int);
 155
 156 extern char *get_inferior_args (void);
 157
 158 extern void set_inferior_args (char *);
 159
 160 extern void set_inferior_args_vector (int, char **);
 161
 162 extern void registers_info (char *, int);
 163
 164 extern void continue_1 (int all_threads);
 165
 166 extern void interrupt_target_1 (int all_threads);
 167
 168 extern void delete_longjmp_breakpoint_cleanup (void *arg);
 169
 170 extern void detach_command (char *, int);
 171
 172 extern void notice_new_inferior (ptid_t, int, int);
 173
 174 extern struct value *get_return_value (struct value *function,
 175                                        struct type *value_type);
 176
 177 /* Prepare for execution command.  TARGET is the target that will run
 178    the command.  BACKGROUND determines whether this is a foreground
 179    (synchronous) or background (asynchronous) command.  */
 180
 181 extern void prepare_execution_command (struct target_ops *target,
 182                                        int background);
 183
 184 /* Whether to start up the debuggee under a shell.
 185
 186    If startup-with-shell is set, GDB's "run" will attempt to start up
 187    the debuggee under a shell.
 188
 189    This is in order for argument-expansion to occur.  E.g.,
 190
 191    (gdb) run *
 192
 193    The "*" gets expanded by the shell into a list of files.
 194
 195    While this is a nice feature, it may be handy to bypass the shell
 196    in some cases.  To disable this feature, do "set startup-with-shell
 197    false".
 198
 199    The catch-exec traps expected during start-up will be one more if
 200    the target is started up with a shell.  */
 201 extern int startup_with_shell;
 202
 203 /* Address at which inferior stopped.  */
 204
 205 extern CORE_ADDR stop_pc;
 206
 207 /* Nonzero if stopped due to completion of a stack dummy routine.  */
 208
 209 extern enum stop_stack_kind stop_stack_dummy;
 210
 211 /* Nonzero if program stopped due to a random (unexpected) signal in
 212    inferior process.  */
 213
 214 extern int stopped_by_random_signal;
 215
 216 /* STEP_OVER_ALL means step over all subroutine calls.
 217    STEP_OVER_UNDEBUGGABLE means step over calls to undebuggable functions.
 218    STEP_OVER_NONE means don't step over any subroutine calls.  */
 219
 220 enum step_over_calls_kind
 221   {
 222     STEP_OVER_NONE,
 223     STEP_OVER_ALL,
 224     STEP_OVER_UNDEBUGGABLE
 225   };
 226
 227 /* Anything but NO_STOP_QUIETLY means we expect a trap and the caller
 228    will handle it themselves.  STOP_QUIETLY is used when running in
 229    the shell before the child program has been exec'd and when running
 230    through shared library loading.  STOP_QUIETLY_REMOTE is used when
 231    setting up a remote connection; it is like STOP_QUIETLY_NO_SIGSTOP
 232    except that there is no need to hide a signal.  */
 233
 234 /* STOP_QUIETLY_NO_SIGSTOP is used to handle a tricky situation with attach.
 235    When doing an attach, the kernel stops the debuggee with a SIGSTOP.
 236    On newer GNU/Linux kernels (>= 2.5.61) the handling of SIGSTOP for
 237    a ptraced process has changed.  Earlier versions of the kernel
 238    would ignore these SIGSTOPs, while now SIGSTOP is treated like any
 239    other signal, i.e. it is not muffled.
 240
 241    If the gdb user does a 'continue' after the 'attach', gdb passes
 242    the global variable stop_signal (which stores the signal from the
 243    attach, SIGSTOP) to the ptrace(PTRACE_CONT,...)  call.  This is
 244    problematic, because the kernel doesn't ignore such SIGSTOP
 245    now.  I.e. it is reported back to gdb, which in turn presents it
 246    back to the user.
 247
 248    To avoid the problem, we use STOP_QUIETLY_NO_SIGSTOP, which allows
 249    gdb to clear the value of stop_signal after the attach, so that it
 250    is not passed back down to the kernel.  */
 251
 252 enum stop_kind
 253   {
 254     NO_STOP_QUIETLY = 0,
 255     STOP_QUIETLY,
 256     STOP_QUIETLY_REMOTE,
 257     STOP_QUIETLY_NO_SIGSTOP
 258   };
 259
 260 \f
 261 /* Possible values for gdbarch_call_dummy_location.  */
 262 #define ON_STACK 1
 263 #define AT_ENTRY_POINT 4
 264
 265 /* Number of traps that happen between exec'ing the shell to run an
 266    inferior and when we finally get to the inferior code, not counting
 267    the exec for the shell.  This is 1 on all supported
 268    implementations.  */
 269 #define START_INFERIOR_TRAPS_EXPECTED   1
 270
 271 struct private_inferior;
 272
 273 /* Inferior process specific part of `struct infcall_control_state'.
 274
 275    Inferior thread counterpart is `struct thread_control_state'.  */
 276
 277 struct inferior_control_state
 278 {
 279   /* See the definition of stop_kind above.  */
 280   enum stop_kind stop_soon;
 281 };
 282
 283 /* GDB represents the state of each program execution with an object
 284    called an inferior.  An inferior typically corresponds to a process
 285    but is more general and applies also to targets that do not have a
 286    notion of processes.  Each run of an executable creates a new
 287    inferior, as does each attachment to an existing process.
 288    Inferiors have unique internal identifiers that are different from
 289    target process ids.  Each inferior may in turn have multiple
 290    threads running in it.  */
 291
 292 struct inferior
 293 {
 294   /* Pointer to next inferior in singly-linked list of inferiors.  */
 295   struct inferior *next;
 296
 297   /* Convenient handle (GDB inferior id).  Unique across all
 298      inferiors.  */
 299   int num;
 300
 301   /* Actual target inferior id, usually, a process id.  This matches
 302      the ptid_t.pid member of threads of this inferior.  */
 303   int pid;
 304   /* True if the PID was actually faked by GDB.  */
 305   int fake_pid_p;
 306
 307   /* The highest thread number this inferior ever had.  */
 308   int highest_thread_num;
 309
 310   /* State of GDB control of inferior process execution.
 311      See `struct inferior_control_state'.  */
 312   struct inferior_control_state control;
 313
 314   /* True if this was an auto-created inferior, e.g. created from
 315      following a fork; false, if this inferior was manually added by
 316      the user, and we should not attempt to prune it
 317      automatically.  */
 318   int removable;
 319
 320   /* The address space bound to this inferior.  */
 321   struct address_space *aspace;
 322
 323   /* The program space bound to this inferior.  */
 324   struct program_space *pspace;
 325
 326   /* The arguments string to use when running.  */
 327   char *args;
 328
 329   /* The size of elements in argv.  */
 330   int argc;
 331
 332   /* The vector version of arguments.  If ARGC is nonzero,
 333      then we must compute ARGS from this (via the target).
 334      This is always coming from main's argv and therefore
 335      should never be freed.  */
 336   char **argv;
 337
 338   /* The name of terminal device to use for I/O.  */
 339   char *terminal;
 340
 341   /* Environment to use for running inferior,
 342      in format described in environ.h.  */
 343   struct gdb_environ *environment;
 344
 345   /* Nonzero if this child process was attached rather than
 346      forked.  */
 347   int attach_flag;
 348
 349   /* If this inferior is a vfork child, then this is the pointer to
 350      its vfork parent, if GDB is still attached to it.  */
 351   struct inferior *vfork_parent;
 352
 353   /* If this process is a vfork parent, this is the pointer to the
 354      child.  Since a vfork parent is left frozen by the kernel until
 355      the child execs or exits, a process can only have one vfork child
 356      at a given time.  */
 357   struct inferior *vfork_child;
 358
 359   /* True if this inferior should be detached when it's vfork sibling
 360      exits or execs.  */
 361   int pending_detach;
 362
 363   /* True if this inferior is a vfork parent waiting for a vfork child
 364      not under our control to be done with the shared memory region,
 365      either by exiting or execing.  */
 366   int waiting_for_vfork_done;
 367
 368   /* True if we're in the process of detaching from this inferior.  */
 369   int detaching;
 370
 371   /* What is left to do for an execution command after any thread of
 372      this inferior stops.  For continuations associated with a
 373      specific thread, see `struct thread_info'.  */
 374   struct continuation *continuations;
 375
 376   /* True if setup_inferior wasn't called for this inferior yet.
 377      Until that is done, we must not access inferior memory or
 378      registers, as we haven't determined the target
 379      architecture/description.  */
 380   int needs_setup;
 381
 382   /* Private data used by the target vector implementation.  */
 383   struct private_inferior *priv;
 384
 385   /* HAS_EXIT_CODE is true if the inferior exited with an exit code.
 386      In this case, the EXIT_CODE field is also valid.  */
 387   int has_exit_code;
 388   LONGEST exit_code;
 389
 390   /* Default flags to pass to the symbol reading functions.  These are
 391      used whenever a new objfile is created.  The valid values come
 392      from enum symfile_add_flags.  */
 393   int symfile_flags;
 394
 395   /* Info about an inferior's target description (if it's fetched; the
 396      user supplied description's filename, if any; etc.).  */
 397   struct target_desc_info *tdesc_info;
 398
 399   /* The architecture associated with the inferior through the
 400      connection to the target.
 401
 402      The architecture vector provides some information that is really
 403      a property of the inferior, accessed through a particular target:
 404      ptrace operations; the layout of certain RSP packets; the
 405      solib_ops vector; etc.  To differentiate architecture accesses to
 406      per-inferior/target properties from
 407      per-thread/per-frame/per-objfile properties, accesses to
 408      per-inferior/target properties should be made through
 409      this gdbarch.  */
 410   struct gdbarch *gdbarch;
 411
 412   /* Per inferior data-pointers required by other GDB modules.  */
 413   REGISTRY_FIELDS;
 414 };
 415
 416 /* Keep a registry of per-inferior data-pointers required by other GDB
 417    modules.  */
 418
 419 DECLARE_REGISTRY (inferior);
 420
 421 /* Create an empty inferior list, or empty the existing one.  */
 422 extern void init_inferior_list (void);
 423
 424 /* Add an inferior to the inferior list, print a message that a new
 425    inferior is found, and return the pointer to the new inferior.
 426    Caller may use this pointer to initialize the private inferior
 427    data.  */
 428 extern struct inferior *add_inferior (int pid);
 429
 430 /* Same as add_inferior, but don't print new inferior notifications to
 431    the CLI.  */
 432 extern struct inferior *add_inferior_silent (int pid);
 433
 434 extern void delete_inferior (struct inferior *todel);
 435
 436 /* Delete an existing inferior list entry, due to inferior detaching.  */
 437 extern void detach_inferior (int pid);
 438
 439 extern void exit_inferior (int pid);
 440
 441 extern void exit_inferior_silent (int pid);
 442
 443 extern void exit_inferior_num_silent (int num);
 444
 445 extern void inferior_appeared (struct inferior *inf, int pid);
 446
 447 /* Get rid of all inferiors.  */
 448 extern void discard_all_inferiors (void);
 449
 450 /* Translate the integer inferior id (GDB's homegrown id, not the system's)
 451    into a "pid" (which may be overloaded with extra inferior information).  */
 452 extern int gdb_inferior_id_to_pid (int);
 453
 454 /* Translate a target 'pid' into the integer inferior id (GDB's
 455    homegrown id, not the system's).  */
 456 extern int pid_to_gdb_inferior_id (int pid);
 457
 458 /* Boolean test for an already-known pid.  */
 459 extern int in_inferior_list (int pid);
 460
 461 /* Boolean test for an already-known inferior id (GDB's homegrown id,
 462    not the system's).  */
 463 extern int valid_gdb_inferior_id (int num);
 464
 465 /* Search function to lookup an inferior by target 'pid'.  */
 466 extern struct inferior *find_inferior_pid (int pid);
 467
 468 /* Search function to lookup an inferior whose pid is equal to 'ptid.pid'. */
 469 extern struct inferior *find_inferior_ptid (ptid_t ptid);
 470
 471 /* Search function to lookup an inferior by GDB 'num'.  */
 472 extern struct inferior *find_inferior_id (int num);
 473
 474 /* Find an inferior bound to PSPACE, giving preference to the current
 475    inferior.  */
 476 extern struct inferior *
 477   find_inferior_for_program_space (struct program_space *pspace);
 478
 479 /* Inferior iterator function.
 480
 481    Calls a callback function once for each inferior, so long as the
 482    callback function returns false.  If the callback function returns
 483    true, the iteration will end and the current inferior will be
 484    returned.  This can be useful for implementing a search for a
 485    inferior with arbitrary attributes, or for applying some operation
 486    to every inferior.
 487
 488    It is safe to delete the iterated inferior from the callback.  */
 489 extern struct inferior *iterate_over_inferiors (int (*) (struct inferior *,
 490                                                          void *),
 491                                                 void *);
 492
 493 /* Returns true if the inferior list is not empty.  */
 494 extern int have_inferiors (void);
 495
 496 /* Returns the number of live inferiors (real live processes).  */
 497 extern int number_of_live_inferiors (void);
 498
 499 /* Returns true if there are any live inferiors in the inferior list
 500    (not cores, not executables, real live processes).  */
 501 extern int have_live_inferiors (void);
 502
 503 /* Return a pointer to the current inferior.  It is an error to call
 504    this if there is no current inferior.  */
 505 extern struct inferior *current_inferior (void);
 506
 507 extern void set_current_inferior (struct inferior *);
 508
 509 extern struct cleanup *save_current_inferior (void);
 510
 511 /* Traverse all inferiors.  */
 512
 513 #define ALL_INFERIORS(I) \
 514   for ((I) = inferior_list; (I); (I) = (I)->next)
 515
 516 /* Traverse all non-exited inferiors.  */
 517
 518 #define ALL_NON_EXITED_INFERIORS(I) \
 519   ALL_INFERIORS (I)                 \
 520     if ((I)->pid != 0)
 521
 522 extern struct inferior *inferior_list;
 523
 524 /* Prune away automatically added inferiors that aren't required
 525    anymore.  */
 526 extern void prune_inferiors (void);
 527
 528 extern int number_of_inferiors (void);
 529
 530 extern struct inferior *add_inferior_with_spaces (void);
 531
 532 /* Print the current selected inferior.  */
 533 extern void print_selected_inferior (struct ui_out *uiout);
 534
 535 #endif /* !defined (INFERIOR_H) */