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