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
   6    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
  34 /* For bpstat.  */
  35 #include "breakpoint.h"
  36
  37 /* For enum target_signal.  */
  38 #include "target.h"
  39
  40 /* For struct frame_id.  */
  41 #include "frame.h"
  42
  43 /* Structure in which to save the status of the inferior.  Create/Save
  44    through "save_inferior_status", restore through
  45    "restore_inferior_status".
  46
  47    This pair of routines should be called around any transfer of
  48    control to the inferior which you don't want showing up in your
  49    control variables.  */
  50
  51 struct inferior_status;
  52
  53 extern struct inferior_status *save_inferior_status (int);
  54
  55 extern void restore_inferior_status (struct inferior_status *);
  56
  57 extern struct cleanup *make_cleanup_restore_inferior_status (struct inferior_status *);
  58
  59 extern void discard_inferior_status (struct inferior_status *);
  60
  61 /* The -1 ptid, often used to indicate either an error condition
  62    or a "don't care" condition, i.e, "run all threads."  */
  63 extern ptid_t minus_one_ptid;
  64
  65 /* The null or zero ptid, often used to indicate no process. */
  66 extern ptid_t null_ptid;
  67
  68 /* Attempt to find and return an existing ptid with the given PID, LWP,
  69    and TID components.  If none exists, create a new one and return
  70    that.  */
  71 ptid_t ptid_build (int pid, long lwp, long tid);
  72
  73 /* Find/Create a ptid from just a pid. */
  74 ptid_t pid_to_ptid (int pid);
  75
  76 /* Fetch the pid (process id) component from a ptid. */
  77 int ptid_get_pid (ptid_t ptid);
  78
  79 /* Fetch the lwp (lightweight process) component from a ptid. */
  80 long ptid_get_lwp (ptid_t ptid);
  81
  82 /* Fetch the tid (thread id) component from a ptid. */
  83 long ptid_get_tid (ptid_t ptid);
  84
  85 /* Compare two ptids to see if they are equal */
  86 extern int ptid_equal (ptid_t p1, ptid_t p2);
  87
  88 /* Return true if PTID represents a process id.  */
  89 extern int ptid_is_pid (ptid_t ptid);
  90
  91 /* Save value of inferior_ptid so that it may be restored by
  92    a later call to do_cleanups().  Returns the struct cleanup
  93    pointer needed for later doing the cleanup.  */
  94 extern struct cleanup * save_inferior_ptid (void);
  95
  96 extern void set_sigint_trap (void);
  97
  98 extern void clear_sigint_trap (void);
  99
 100 extern void set_sigio_trap (void);
 101
 102 extern void clear_sigio_trap (void);
 103
 104 /* Set/get file name for default use for standard in/out in the inferior.  */
 105
 106 extern void set_inferior_io_terminal (const char *terminal_name);
 107 extern const char *get_inferior_io_terminal (void);
 108
 109 /* Collected pid, tid, etc. of the debugged inferior.  When there's
 110    no inferior, PIDGET (inferior_ptid) will be 0. */
 111
 112 extern ptid_t inferior_ptid;
 113
 114 /* Are we simulating synchronous execution? This is used in async gdb
 115    to implement the 'run', 'continue' etc commands, which will not
 116    redisplay the prompt until the execution is actually over. */
 117 extern int sync_execution;
 118
 119 /* Inferior environment. */
 120
 121 extern struct gdb_environ *inferior_environ;
 122
 123 extern void clear_proceed_status (void);
 124
 125 extern void proceed (CORE_ADDR, enum target_signal, int);
 126
 127 /* When set, stop the 'step' command if we enter a function which has
 128    no line number information.  The normal behavior is that we step
 129    over such function.  */
 130 extern int step_stop_if_no_debug;
 131
 132 /* If set, the inferior should be controlled in non-stop mode.  In
 133    this mode, each thread is controlled independently.  Execution
 134    commands apply only to the the selected thread by default, and stop
 135    events stop only the thread that had the event -- the other threads
 136    are kept running freely.  */
 137 extern int non_stop;
 138
 139 extern void generic_mourn_inferior (void);
 140
 141 extern void terminal_save_ours (void);
 142
 143 extern void terminal_ours (void);
 144
 145 extern CORE_ADDR read_pc (void);
 146
 147 extern void write_pc (CORE_ADDR);
 148
 149 extern CORE_ADDR unsigned_pointer_to_address (struct type *type,
 150                                               const gdb_byte *buf);
 151 extern void unsigned_address_to_pointer (struct type *type, gdb_byte *buf,
 152                                          CORE_ADDR addr);
 153 extern CORE_ADDR signed_pointer_to_address (struct type *type,
 154                                             const gdb_byte *buf);
 155 extern void address_to_signed_pointer (struct type *type, gdb_byte *buf,
 156                                        CORE_ADDR addr);
 157
 158 extern void wait_for_inferior (int treat_exec_as_sigtrap);
 159
 160 extern void fetch_inferior_event (void *);
 161
 162 extern void init_wait_for_inferior (void);
 163
 164 extern void close_exec_file (void);
 165
 166 extern void reopen_exec_file (void);
 167
 168 /* The `resume' routine should only be called in special circumstances.
 169    Normally, use `proceed', which handles a lot of bookkeeping.  */
 170
 171 extern void resume (int, enum target_signal);
 172
 173 /* From misc files */
 174
 175 extern void default_print_registers_info (struct gdbarch *gdbarch,
 176                                           struct ui_file *file,
 177                                           struct frame_info *frame,
 178                                           int regnum, int all);
 179
 180 extern void child_terminal_info (char *, int);
 181
 182 extern void term_info (char *, int);
 183
 184 extern void terminal_ours_for_output (void);
 185
 186 extern void terminal_inferior (void);
 187
 188 extern void terminal_init_inferior (void);
 189
 190 extern void terminal_init_inferior_with_pgrp (int pgrp);
 191
 192 /* From procfs.c */
 193
 194 extern int proc_iterate_over_mappings (int (*)(int, CORE_ADDR));
 195
 196 extern ptid_t procfs_first_available (void);
 197
 198 /* From fork-child.c */
 199
 200 extern int fork_inferior (char *, char *, char **,
 201                           void (*)(void),
 202                           void (*)(int), void (*)(void), char *);
 203
 204
 205 extern void startup_inferior (int);
 206
 207 extern char *construct_inferior_arguments (struct gdbarch *, int, char **);
 208
 209 /* From inflow.c */
 210
 211 extern void new_tty_prefork (const char *);
 212
 213 extern int gdb_has_a_terminal (void);
 214
 215 /* From infrun.c */
 216
 217 extern void start_remote (int from_tty);
 218
 219 extern void normal_stop (void);
 220
 221 extern int signal_stop_state (int);
 222
 223 extern int signal_print_state (int);
 224
 225 extern int signal_pass_state (int);
 226
 227 extern int signal_stop_update (int, int);
 228
 229 extern int signal_print_update (int, int);
 230
 231 extern int signal_pass_update (int, int);
 232
 233 extern void get_last_target_status(ptid_t *ptid,
 234                                    struct target_waitstatus *status);
 235
 236 extern void follow_inferior_reset_breakpoints (void);
 237
 238 /* Throw an error indicating the current thread is running.  */
 239 extern void error_is_running (void);
 240
 241 /* Calls error_is_running if the current thread is running.  */
 242 extern void ensure_not_running (void);
 243
 244 /* From infcmd.c */
 245
 246 extern void tty_command (char *, int);
 247
 248 extern void post_create_inferior (struct target_ops *, int);
 249
 250 extern void attach_command (char *, int);
 251
 252 extern char *get_inferior_args (void);
 253
 254 extern char *set_inferior_args (char *);
 255
 256 extern void set_inferior_args_vector (int, char **);
 257
 258 extern void registers_info (char *, int);
 259
 260 extern void nexti_command (char *, int);
 261
 262 extern void stepi_command (char *, int);
 263
 264 extern void continue_1 (int all_threads);
 265
 266 extern void continue_command (char *, int);
 267
 268 extern void interrupt_target_command (char *args, int from_tty);
 269
 270 extern void interrupt_target_1 (int all_threads);
 271
 272 /* Address at which inferior stopped.  */
 273
 274 extern CORE_ADDR stop_pc;
 275
 276 /* Flag indicating that a command has proceeded the inferior past the
 277    current breakpoint.  */
 278
 279 extern int breakpoint_proceeded;
 280
 281 /* Nonzero if stopped due to completion of a stack dummy routine.  */
 282
 283 extern int stop_stack_dummy;
 284
 285 /* Nonzero if program stopped due to a random (unexpected) signal in
 286    inferior process.  */
 287
 288 extern int stopped_by_random_signal;
 289
 290 /* 1 means step over all subroutine calls.
 291    -1 means step over calls to undebuggable functions.  */
 292
 293 enum step_over_calls_kind
 294   {
 295     STEP_OVER_NONE,
 296     STEP_OVER_ALL,
 297     STEP_OVER_UNDEBUGGABLE
 298   };
 299
 300 /* Anything but NO_STOP_QUIETLY means we expect a trap and the caller
 301    will handle it themselves.  STOP_QUIETLY is used when running in
 302    the shell before the child program has been exec'd and when running
 303    through shared library loading.  STOP_QUIETLY_REMOTE is used when
 304    setting up a remote connection; it is like STOP_QUIETLY_NO_SIGSTOP
 305    except that there is no need to hide a signal.  */
 306
 307 /* It is also used after attach, due to attaching to a process. This
 308    is a bit trickier.  When doing an attach, the kernel stops the
 309    debuggee with a SIGSTOP.  On newer GNU/Linux kernels (>= 2.5.61)
 310    the handling of SIGSTOP for a ptraced process has changed. Earlier
 311    versions of the kernel would ignore these SIGSTOPs, while now
 312    SIGSTOP is treated like any other signal, i.e. it is not muffled.
 313
 314    If the gdb user does a 'continue' after the 'attach', gdb passes
 315    the global variable stop_signal (which stores the signal from the
 316    attach, SIGSTOP) to the ptrace(PTRACE_CONT,...)  call.  This is
 317    problematic, because the kernel doesn't ignore such SIGSTOP
 318    now. I.e. it is reported back to gdb, which in turn presents it
 319    back to the user.
 320
 321    To avoid the problem, we use STOP_QUIETLY_NO_SIGSTOP, which allows
 322    gdb to clear the value of stop_signal after the attach, so that it
 323    is not passed back down to the kernel.  */
 324
 325 enum stop_kind
 326   {
 327     NO_STOP_QUIETLY = 0,
 328     STOP_QUIETLY,
 329     STOP_QUIETLY_REMOTE,
 330     STOP_QUIETLY_NO_SIGSTOP
 331   };
 332
 333 /* Reverse execution.  */
 334 enum exec_direction_kind
 335   {
 336     EXEC_FORWARD,
 337     EXEC_REVERSE,
 338     EXEC_ERROR
 339   };
 340
 341 extern enum exec_direction_kind execution_direction;
 342
 343 /* Nonzero if proceed is being used for a "finish" command or a similar
 344    situation when stop_registers should be saved.  */
 345
 346 extern int proceed_to_finish;
 347
 348 /* Save register contents here when about to pop a stack dummy frame,
 349    if-and-only-if proceed_to_finish is set.
 350    Thus this contains the return value from the called function (assuming
 351    values are returned in a register).  */
 352
 353 extern struct regcache *stop_registers;
 354
 355 /* True if we are debugging displaced stepping.  */
 356 extern int debug_displaced;
 357
 358 /* Dump LEN bytes at BUF in hex to FILE, followed by a newline.  */
 359 void displaced_step_dump_bytes (struct ui_file *file,
 360                                 const gdb_byte *buf, size_t len);
 361
 362
 363 /* When set, normal_stop will not call the normal_stop observer.  */
 364 extern int suppress_stop_observer;
 365
 366 /* When set, no calls to target_resumed observer will be made.  */
 367 extern int suppress_resume_observer;
 368
 369 \f
 370 /* Possible values for gdbarch_call_dummy_location.  */
 371 #define ON_STACK 1
 372 #define AT_ENTRY_POINT 4
 373 #define AT_SYMBOL 5
 374
 375 /* If STARTUP_WITH_SHELL is set, GDB's "run"
 376    will attempts to start up the debugee under a shell.
 377    This is in order for argument-expansion to occur. E.g.,
 378    (gdb) run *
 379    The "*" gets expanded by the shell into a list of files.
 380    While this is a nice feature, it turns out to interact badly
 381    with some of the catch-fork/catch-exec features we have added.
 382    In particular, if the shell does any fork/exec's before
 383    the exec of the target program, that can confuse GDB.
 384    To disable this feature, set STARTUP_WITH_SHELL to 0.
 385    To enable this feature, set STARTUP_WITH_SHELL to 1.
 386    The catch-exec traps expected during start-up will
 387    be 1 if target is not started up with a shell, 2 if it is.
 388    - RT
 389    If you disable this, you need to decrement
 390    START_INFERIOR_TRAPS_EXPECTED in tm.h. */
 391 #define STARTUP_WITH_SHELL 1
 392 #if !defined(START_INFERIOR_TRAPS_EXPECTED)
 393 #define START_INFERIOR_TRAPS_EXPECTED   2
 394 #endif
 395
 396 struct private_inferior;
 397
 398 /* GDB represents the state of each program execution with an object
 399    called an inferior.  An inferior typically corresponds to a process
 400    but is more general and applies also to targets that do not have a
 401    notion of processes.  Each run of an executable creates a new
 402    inferior, as does each attachment to an existing process.
 403    Inferiors have unique internal identifiers that are different from
 404    target process ids.  Each inferior may in turn have multiple
 405    threads running in it.  */
 406
 407 struct inferior
 408 {
 409   /* Pointer to next inferior in singly-linked list of inferiors.  */
 410   struct inferior *next;
 411
 412   /* Convenient handle (GDB inferior id).  Unique across all
 413      inferiors.  */
 414   int num;
 415
 416   /* Actual target inferior id, usually, a process id.  This matches
 417      the ptid_t.pid member of threads of this inferior.  */
 418   int pid;
 419
 420   /* See the definition of stop_kind above.  */
 421   enum stop_kind stop_soon;
 422
 423   /* Nonzero if this child process was attached rather than
 424      forked.  */
 425   int attach_flag;
 426
 427   /* What is left to do for an execution command after any thread of
 428      this inferior stops.  For continuations associated with a
 429      specific thread, see `struct thread_info'.  */
 430   struct continuation *continuations;
 431
 432   /* Private data used by the target vector implementation.  */
 433   struct private_inferior *private;
 434 };
 435
 436 /* Create an empty inferior list, or empty the existing one.  */
 437 extern void init_inferior_list (void);
 438
 439 /* Add an inferior to the inferior list, print a message that a new
 440    inferior is found, and return the pointer to the new inferior.
 441    Caller may use this pointer to initialize the private inferior
 442    data.  */
 443 extern struct inferior *add_inferior (int pid);
 444
 445 /* Same as add_inferior, but don't print new inferior notifications to
 446    the CLI.  */
 447 extern struct inferior *add_inferior_silent (int pid);
 448
 449 /* Delete an existing inferior list entry, due to inferior exit.  */
 450 extern void delete_inferior (int pid);
 451
 452 /* Same as delete_inferior, but don't print new inferior notifications
 453    to the CLI.  */
 454 extern void delete_inferior_silent (int pid);
 455
 456 /* Delete an existing inferior list entry, due to inferior detaching.  */
 457 extern void detach_inferior (int pid);
 458
 459 /* Get rid of all inferiors.  */
 460 extern void discard_all_inferiors (void);
 461
 462 /* Translate the integer inferior id (GDB's homegrown id, not the system's)
 463    into a "pid" (which may be overloaded with extra inferior information).  */
 464 extern int gdb_inferior_id_to_pid (int);
 465
 466 /* Translate a target 'pid' into the integer inferior id (GDB's
 467    homegrown id, not the system's).  */
 468 extern int pid_to_gdb_inferior_id (int pid);
 469
 470 /* Boolean test for an already-known pid.  */
 471 extern int in_inferior_list (int pid);
 472
 473 /* Boolean test for an already-known inferior id (GDB's homegrown id,
 474    not the system's).  */
 475 extern int valid_inferior_id (int num);
 476
 477 /* Search function to lookup a inferior by target 'pid'.  */
 478 extern struct inferior *find_inferior_pid (int pid);
 479
 480 /* Inferior iterator function.
 481
 482    Calls a callback function once for each inferior, so long as the
 483    callback function returns false.  If the callback function returns
 484    true, the iteration will end and the current inferior will be
 485    returned.  This can be useful for implementing a search for a
 486    inferior with arbitrary attributes, or for applying some operation
 487    to every inferior.
 488
 489    It is safe to delete the iterated inferior from the callback.  */
 490 extern struct inferior *iterate_over_inferiors (int (*) (struct inferior *,
 491                                                          void *),
 492                                                 void *);
 493
 494 /* Prints the list of inferiors and their details on UIOUT.
 495
 496    If REQUESTED_INFERIOR is not -1, it's the GDB id of the inferior
 497    that should be printed.  Otherwise, all inferiors are printed.  */
 498 extern void print_inferior (struct ui_out *uiout, int requested_inferior);
 499
 500 /* Returns true if the inferior list is not empty.  */
 501 extern int have_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 #endif /* !defined (INFERIOR_H) */