gdb/defs.h

   1 /* *INDENT-OFF* */ /* ATTRIBUTE_PRINTF confuses indent, avoid running it
   2                       for now.  */
   3 /* Basic, host-specific, and target-specific definitions for GDB.
   4    Copyright (C) 1986-2018 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 #ifndef DEFS_H
  22 #define DEFS_H
  23
  24 #ifdef GDBSERVER
  25 #  error gdbserver should not include gdb/defs.h
  26 #endif
  27
  28 #include "common-defs.h"
  29
  30 #include <sys/types.h>
  31 #include <limits.h>
  32
  33 /* The libdecnumber library, on which GDB depends, includes a header file
  34    called gstdint.h instead of relying directly on stdint.h.  GDB, on the
  35    other hand, includes stdint.h directly, relying on the fact that gnulib
  36    generates a copy if the system doesn't provide one or if it is missing
  37    some features.  Unfortunately, gstdint.h and stdint.h cannot be included
  38    at the same time, which may happen when we include a file from
  39    libdecnumber.
  40
  41    The following macro definition effectively prevents the inclusion of
  42    gstdint.h, as all the definitions it provides are guarded against
  43    the GCC_GENERATED_STDINT_H macro.  We already have gnulib/stdint.h
  44    included, so it's ok to blank out gstdint.h.  */
  45 #define GCC_GENERATED_STDINT_H 1
  46
  47 #include <unistd.h>
  48
  49 #include <fcntl.h>
  50
  51 #include "gdb_wchar.h"
  52
  53 #include "ui-file.h"
  54
  55 #include "host-defs.h"
  56 #include "common/enum-flags.h"
  57
  58 /* Scope types enumerator.  List the types of scopes the compiler will
  59    accept.  */
  60
  61 enum compile_i_scope_types
  62   {
  63     COMPILE_I_INVALID_SCOPE,
  64
  65     /* A simple scope.  Wrap an expression into a simple scope that
  66        takes no arguments, returns no value, and uses the generic
  67        function name "_gdb_expr". */
  68
  69     COMPILE_I_SIMPLE_SCOPE,
  70
  71     /* Do not wrap the expression,
  72        it has to provide function "_gdb_expr" on its own.  */
  73     COMPILE_I_RAW_SCOPE,
  74
  75     /* A printable expression scope.  Wrap an expression into a scope
  76        suitable for the "compile print" command.  It uses the generic
  77        function name "_gdb_expr".  COMPILE_I_PRINT_ADDRESS_SCOPE variant
  78        is the usual one, taking address of the object.
  79        COMPILE_I_PRINT_VALUE_SCOPE is needed for arrays where the array
  80        name already specifies its address.  See get_out_value_type.  */
  81     COMPILE_I_PRINT_ADDRESS_SCOPE,
  82     COMPILE_I_PRINT_VALUE_SCOPE,
  83   };
  84
  85
  86 template<typename T>
  87 using RequireLongest = gdb::Requires<gdb::Or<std::is_same<T, LONGEST>,
  88                                              std::is_same<T, ULONGEST>>>;
  89
  90 /* Just in case they're not defined in stdio.h.  */
  91
  92 #ifndef SEEK_SET
  93 #define SEEK_SET 0
  94 #endif
  95 #ifndef SEEK_CUR
  96 #define SEEK_CUR 1
  97 #endif
  98
  99 /* The O_BINARY flag is defined in fcntl.h on some non-Posix platforms.
 100    It is used as an access modifier in calls to open(), where it acts
 101    similarly to the "b" character in fopen()'s MODE argument.  On Posix
 102    platforms it should be a no-op, so it is defined as 0 here.  This
 103    ensures that the symbol may be used freely elsewhere in gdb.  */
 104
 105 #ifndef O_BINARY
 106 #define O_BINARY 0
 107 #endif
 108
 109 #include "hashtab.h"
 110
 111 /* * Enable dbx commands if set.  */
 112 extern int dbx_commands;
 113
 114 /* * System root path, used to find libraries etc.  */
 115 extern char *gdb_sysroot;
 116
 117 /* * GDB datadir, used to store data files.  */
 118 extern char *gdb_datadir;
 119
 120 /* * If non-NULL, the possibly relocated path to python's "lib" directory
 121    specified with --with-python.  */
 122 extern char *python_libdir;
 123
 124 /* * Search path for separate debug files.  */
 125 extern char *debug_file_directory;
 126
 127 /* GDB's SIGINT handler basically sets a flag; code that might take a
 128    long time before it gets back to the event loop, and which ought to
 129    be interruptible, checks this flag using the QUIT macro, which, if
 130    GDB has the terminal, throws a quit exception.
 131
 132    In addition to setting a flag, the SIGINT handler also marks a
 133    select/poll-able file descriptor as read-ready.  That is used by
 134    interruptible_select in order to support interrupting blocking I/O
 135    in a race-free manner.
 136
 137    These functions use the extension_language_ops API to allow extension
 138    language(s) and GDB SIGINT handling to coexist seamlessly.  */
 139
 140 /* * Evaluate to non-zero if the quit flag is set, zero otherwise.  This
 141    will clear the quit flag as a side effect.  */
 142 extern int check_quit_flag (void);
 143 /* * Set the quit flag.  */
 144 extern void set_quit_flag (void);
 145
 146 /* The current quit handler (and its type).  This is called from the
 147    QUIT macro.  See default_quit_handler below for default behavior.
 148    Parts of GDB temporarily override this to e.g., completely suppress
 149    Ctrl-C because it would not be safe to throw.  E.g., normally, you
 150    wouldn't want to quit between a RSP command and its response, as
 151    that would break the communication with the target, but you may
 152    still want to intercept the Ctrl-C and offer to disconnect if the
 153    user presses Ctrl-C multiple times while the target is stuck
 154    waiting for the wedged remote stub.  */
 155 typedef void (quit_handler_ftype) (void);
 156 extern quit_handler_ftype *quit_handler;
 157
 158 /* The default quit handler.  Checks whether Ctrl-C was pressed, and
 159    if so:
 160
 161      - If GDB owns the terminal, throws a quit exception.
 162
 163      - If GDB does not own the terminal, forwards the Ctrl-C to the
 164        target.
 165 */
 166 extern void default_quit_handler (void);
 167
 168 /* Flag that function quit should call quit_force.  */
 169 extern volatile int sync_quit_force_run;
 170
 171 extern void quit (void);
 172
 173 /* Helper for the QUIT macro.  */
 174
 175 extern void maybe_quit (void);
 176
 177 /* Check whether a Ctrl-C was typed, and if so, call the current quit
 178    handler.  */
 179 #define QUIT maybe_quit ()
 180
 181 /* Set the serial event associated with the quit flag.  */
 182 extern void quit_serial_event_set (void);
 183
 184 /* Clear the serial event associated with the quit flag.  */
 185 extern void quit_serial_event_clear (void);
 186
 187 /* * Languages represented in the symbol table and elsewhere.
 188    This should probably be in language.h, but since enum's can't
 189    be forward declared to satisfy opaque references before their
 190    actual definition, needs to be here.
 191
 192    The constants here are in priority order.  In particular,
 193    demangling is attempted according to this order.
 194
 195    Note that there's ambiguity between the mangling schemes of some of
 196    these languages, so some symbols could be successfully demangled by
 197    several languages.  For that reason, the constants here are sorted
 198    in the order we'll attempt demangling them.  For example: Rust uses
 199    C++ mangling, so must come after C++; Ada must come last (see
 200    ada_sniff_from_mangled_name).  (Keep this order in sync with the
 201    'languages' array in language.c.)  */
 202
 203 enum language
 204   {
 205     language_unknown,           /* Language not known */
 206     language_auto,              /* Placeholder for automatic setting */
 207     language_c,                 /* C */
 208     language_objc,              /* Objective-C */
 209     language_cplus,             /* C++ */
 210     language_d,                 /* D */
 211     language_go,                /* Go */
 212     language_fortran,           /* Fortran */
 213     language_m2,                /* Modula-2 */
 214     language_asm,               /* Assembly language */
 215     language_pascal,            /* Pascal */
 216     language_opencl,            /* OpenCL */
 217     language_rust,              /* Rust */
 218     language_minimal,           /* All other languages, minimal support only */
 219     language_ada,               /* Ada */
 220     nr_languages
 221   };
 222
 223 /* The number of bits needed to represent all languages, with enough
 224    padding to allow for reasonable growth.  */
 225 #define LANGUAGE_BITS 5
 226 gdb_static_assert (nr_languages <= (1 << LANGUAGE_BITS));
 227
 228 enum precision_type
 229   {
 230     single_precision,
 231     double_precision,
 232     unspecified_precision
 233   };
 234
 235 /* * A generic, not quite boolean, enumeration.  This is used for
 236    set/show commands in which the options are on/off/automatic.  */
 237 enum auto_boolean
 238 {
 239   AUTO_BOOLEAN_TRUE,
 240   AUTO_BOOLEAN_FALSE,
 241   AUTO_BOOLEAN_AUTO
 242 };
 243
 244 /* * Potential ways that a function can return a value of a given
 245    type.  */
 246
 247 enum return_value_convention
 248 {
 249   /* * Where the return value has been squeezed into one or more
 250      registers.  */
 251   RETURN_VALUE_REGISTER_CONVENTION,
 252   /* * Commonly known as the "struct return convention".  The caller
 253      passes an additional hidden first parameter to the caller.  That
 254      parameter contains the address at which the value being returned
 255      should be stored.  While typically, and historically, used for
 256      large structs, this is convention is applied to values of many
 257      different types.  */
 258   RETURN_VALUE_STRUCT_CONVENTION,
 259   /* * Like the "struct return convention" above, but where the ABI
 260      guarantees that the called function stores the address at which
 261      the value being returned is stored in a well-defined location,
 262      such as a register or memory slot in the stack frame.  Don't use
 263      this if the ABI doesn't explicitly guarantees this.  */
 264   RETURN_VALUE_ABI_RETURNS_ADDRESS,
 265   /* * Like the "struct return convention" above, but where the ABI
 266      guarantees that the address at which the value being returned is
 267      stored will be available in a well-defined location, such as a
 268      register or memory slot in the stack frame.  Don't use this if
 269      the ABI doesn't explicitly guarantees this.  */
 270   RETURN_VALUE_ABI_PRESERVES_ADDRESS,
 271 };
 272
 273 /* Needed for various prototypes */
 274
 275 struct symtab;
 276 struct breakpoint;
 277 struct frame_info;
 278 struct gdbarch;
 279 struct value;
 280
 281 /* From main.c.  */
 282
 283 /* This really belong in utils.c (path-utils.c?), but it references some
 284    globals that are currently only available to main.c.  */
 285 extern char *relocate_gdb_directory (const char *initial, int flag);
 286
 287 \f
 288 /* Annotation stuff.  */
 289
 290 extern int annotation_level;    /* in stack.c */
 291 \f
 292
 293 /* From regex.c or libc.  BSD 4.4 declares this with the argument type as
 294    "const char *" in unistd.h, so we can't declare the argument
 295    as "char *".  */
 296
 297 EXTERN_C char *re_comp (const char *);
 298
 299 /* From symfile.c */
 300
 301 extern void symbol_file_command (const char *, int);
 302
 303 /* * Remote targets may wish to use this as their load function.  */
 304 extern void generic_load (const char *name, int from_tty);
 305
 306 /* From top.c */
 307
 308 typedef void initialize_file_ftype (void);
 309
 310 extern char *gdb_readline_wrapper (const char *);
 311
 312 extern char *command_line_input (const char *, int, const char *);
 313
 314 extern void print_prompt (void);
 315
 316 struct ui;
 317
 318 extern int input_interactive_p (struct ui *);
 319
 320 extern int info_verbose;
 321
 322 /* From printcmd.c */
 323
 324 extern void set_next_address (struct gdbarch *, CORE_ADDR);
 325
 326 extern int print_address_symbolic (struct gdbarch *, CORE_ADDR,
 327                                    struct ui_file *, int,
 328                                    const char *);
 329
 330 extern int build_address_symbolic (struct gdbarch *,
 331                                    CORE_ADDR addr,
 332                                    int do_demangle,
 333                                    char **name,
 334                                    int *offset,
 335                                    char **filename,
 336                                    int *line,
 337                                    int *unmapped);
 338
 339 extern void print_address (struct gdbarch *, CORE_ADDR, struct ui_file *);
 340 extern const char *pc_prefix (CORE_ADDR);
 341
 342 /* From exec.c */
 343
 344 /* * Process memory area starting at ADDR with length SIZE.  Area is
 345    readable iff READ is non-zero, writable if WRITE is non-zero,
 346    executable if EXEC is non-zero.  Area is possibly changed against
 347    its original file based copy if MODIFIED is non-zero.  DATA is
 348    passed without changes from a caller.  */
 349
 350 typedef int (*find_memory_region_ftype) (CORE_ADDR addr, unsigned long size,
 351                                          int read, int write, int exec,
 352                                          int modified, void *data);
 353
 354 /* * Possible lvalue types.  Like enum language, this should be in
 355    value.h, but needs to be here for the same reason.  */
 356
 357 enum lval_type
 358   {
 359     /* * Not an lval.  */
 360     not_lval,
 361     /* * In memory.  */
 362     lval_memory,
 363     /* * In a register.  Registers are relative to a frame.  */
 364     lval_register,
 365     /* * In a gdb internal variable.  */
 366     lval_internalvar,
 367     /* * Value encapsulates a callable defined in an extension language.  */
 368     lval_xcallable,
 369     /* * Part of a gdb internal variable (structure field).  */
 370     lval_internalvar_component,
 371     /* * Value's bits are fetched and stored using functions provided
 372        by its creator.  */
 373     lval_computed
 374   };
 375
 376 /* * Parameters of the "info proc" command.  */
 377
 378 enum info_proc_what
 379   {
 380     /* * Display the default cmdline, cwd and exe outputs.  */
 381     IP_MINIMAL,
 382
 383     /* * Display `info proc mappings'.  */
 384     IP_MAPPINGS,
 385
 386     /* * Display `info proc status'.  */
 387     IP_STATUS,
 388
 389     /* * Display `info proc stat'.  */
 390     IP_STAT,
 391
 392     /* * Display `info proc cmdline'.  */
 393     IP_CMDLINE,
 394
 395     /* * Display `info proc exe'.  */
 396     IP_EXE,
 397
 398     /* * Display `info proc cwd'.  */
 399     IP_CWD,
 400
 401     /* * Display all of the above.  */
 402     IP_ALL
 403   };
 404
 405 /* * Default radixes for input and output.  Only some values supported.  */
 406 extern unsigned input_radix;
 407 extern unsigned output_radix;
 408
 409 /* * Possibilities for prettyformat parameters to routines which print
 410    things.  Like enum language, this should be in value.h, but needs
 411    to be here for the same reason.  FIXME:  If we can eliminate this
 412    as an arg to LA_VAL_PRINT, then we can probably move it back to
 413    value.h.  */
 414
 415 enum val_prettyformat
 416   {
 417     Val_no_prettyformat = 0,
 418     Val_prettyformat,
 419     /* * Use the default setting which the user has specified.  */
 420     Val_prettyformat_default
 421   };
 422
 423 /* * Optional native machine support.  Non-native (and possibly pure
 424    multi-arch) targets do not need a "nm.h" file.  This will be a
 425    symlink to one of the nm-*.h files, built by the `configure'
 426    script.  */
 427
 428 #ifdef GDB_NM_FILE
 429 #include "nm.h"
 430 #endif
 431
 432 /* Assume that fopen accepts the letter "b" in the mode string.
 433    It is demanded by ISO C9X, and should be supported on all
 434    platforms that claim to have a standard-conforming C library.  On
 435    true POSIX systems it will be ignored and have no effect.  There
 436    may still be systems without a standard-conforming C library where
 437    an ISO C9X compiler (GCC) is available.  Known examples are SunOS
 438    4.x and 4.3BSD.  This assumption means these systems are no longer
 439    supported.  */
 440 #ifndef FOPEN_RB
 441 # include "fopen-bin.h"
 442 #endif
 443
 444 /* Defaults for system-wide constants (if not defined by xm.h, we fake it).
 445    FIXME: Assumes 2's complement arithmetic.  */
 446
 447 #if !defined (UINT_MAX)
 448 #define UINT_MAX ((unsigned int)(~0))       /* 0xFFFFFFFF for 32-bits */
 449 #endif
 450
 451 #if !defined (INT_MAX)
 452 #define INT_MAX ((int)(UINT_MAX >> 1))      /* 0x7FFFFFFF for 32-bits */
 453 #endif
 454
 455 #if !defined (INT_MIN)
 456 #define INT_MIN ((int)((int) ~0 ^ INT_MAX)) /* 0x80000000 for 32-bits */
 457 #endif
 458
 459 #if !defined (ULONG_MAX)
 460 #define ULONG_MAX ((unsigned long)(~0L))    /* 0xFFFFFFFF for 32-bits */
 461 #endif
 462
 463 #if !defined (LONG_MAX)
 464 #define LONG_MAX ((long)(ULONG_MAX >> 1))   /* 0x7FFFFFFF for 32-bits */
 465 #endif
 466
 467 #if !defined (ULONGEST_MAX)
 468 #define ULONGEST_MAX (~(ULONGEST)0)        /* 0xFFFFFFFFFFFFFFFF for 64-bits */
 469 #endif
 470
 471 #if !defined (LONGEST_MAX)                 /* 0x7FFFFFFFFFFFFFFF for 64-bits */
 472 #define LONGEST_MAX ((LONGEST)(ULONGEST_MAX >> 1))
 473 #endif
 474
 475 /* * Convert a LONGEST to an int.  This is used in contexts (e.g. number of
 476    arguments to a function, number in a value history, register number, etc.)
 477    where the value must not be larger than can fit in an int.  */
 478
 479 extern int longest_to_int (LONGEST);
 480
 481 /* * List of known OS ABIs.  If you change this, make sure to update the
 482    table in osabi.c.  */
 483 enum gdb_osabi
 484 {
 485   GDB_OSABI_UNKNOWN = 0,        /* keep this zero */
 486   GDB_OSABI_NONE,
 487
 488   GDB_OSABI_SVR4,
 489   GDB_OSABI_HURD,
 490   GDB_OSABI_SOLARIS,
 491   GDB_OSABI_LINUX,
 492   GDB_OSABI_FREEBSD,
 493   GDB_OSABI_NETBSD,
 494   GDB_OSABI_OPENBSD,
 495   GDB_OSABI_WINCE,
 496   GDB_OSABI_GO32,
 497   GDB_OSABI_QNXNTO,
 498   GDB_OSABI_CYGWIN,
 499   GDB_OSABI_AIX,
 500   GDB_OSABI_DICOS,
 501   GDB_OSABI_DARWIN,
 502   GDB_OSABI_SYMBIAN,
 503   GDB_OSABI_OPENVMS,
 504   GDB_OSABI_LYNXOS178,
 505   GDB_OSABI_NEWLIB,
 506   GDB_OSABI_SDE,
 507
 508   GDB_OSABI_INVALID             /* keep this last */
 509 };
 510
 511 /* Enumerate the requirements a symbol has in order to be evaluated.
 512    These are listed in order of "strength" -- a later entry subsumes
 513    earlier ones.  This fine-grained distinction is important because
 514    it allows for the evaluation of a TLS symbol during unwinding --
 515    when unwinding one has access to registers, but not the frame
 516    itself, because that is being constructed.  */
 517
 518 enum symbol_needs_kind
 519 {
 520   /* No special requirements -- just memory.  */
 521   SYMBOL_NEEDS_NONE,
 522
 523   /* The symbol needs registers.  */
 524   SYMBOL_NEEDS_REGISTERS,
 525
 526   /* The symbol needs a frame.  */
 527   SYMBOL_NEEDS_FRAME
 528 };
 529
 530 /* Dynamic target-system-dependent parameters for GDB.  */
 531 #include "gdbarch.h"
 532
 533 /* In findvar.c.  */
 534
 535 template<typename T, typename = RequireLongest<T>>
 536 T extract_integer (const gdb_byte *addr, int len, enum bfd_endian byte_order);
 537
 538 static inline LONGEST
 539 extract_signed_integer (const gdb_byte *addr, int len,
 540                         enum bfd_endian byte_order)
 541 {
 542   return extract_integer<LONGEST> (addr, len, byte_order);
 543 }
 544
 545 static inline ULONGEST
 546 extract_unsigned_integer (const gdb_byte *addr, int len,
 547                           enum bfd_endian byte_order)
 548 {
 549   return extract_integer<ULONGEST> (addr, len, byte_order);
 550 }
 551
 552 extern int extract_long_unsigned_integer (const gdb_byte *, int,
 553                                           enum bfd_endian, LONGEST *);
 554
 555 extern CORE_ADDR extract_typed_address (const gdb_byte *buf,
 556                                         struct type *type);
 557
 558 /* All 'store' functions accept a host-format integer and store a
 559    target-format integer at ADDR which is LEN bytes long.  */
 560
 561 template<typename T, typename = RequireLongest<T>>
 562 extern void store_integer (gdb_byte *addr, int len, enum bfd_endian byte_order,
 563                            T val);
 564
 565 static inline void
 566 store_signed_integer (gdb_byte *addr, int len,
 567                       enum bfd_endian byte_order, LONGEST val)
 568 {
 569   return store_integer (addr, len, byte_order, val);
 570 }
 571
 572 static inline void
 573 store_unsigned_integer (gdb_byte *addr, int len,
 574                         enum bfd_endian byte_order, ULONGEST val)
 575 {
 576   return store_integer (addr, len, byte_order, val);
 577 }
 578
 579 extern void store_typed_address (gdb_byte *buf, struct type *type,
 580                                  CORE_ADDR addr);
 581
 582 extern void copy_integer_to_size (gdb_byte *dest, int dest_size,
 583                                   const gdb_byte *source, int source_size,
 584                                   bool is_signed, enum bfd_endian byte_order);
 585
 586 /* From valops.c */
 587
 588 extern int watchdog;
 589
 590 /* From dwarf2read.c */
 591
 592 ULONGEST read_unsigned_leb128 (bfd *, const gdb_byte *, unsigned int *);
 593
 594 /* Hooks for alternate command interfaces.  */
 595
 596 /* * The name of the interpreter if specified on the command line.  */
 597 extern char *interpreter_p;
 598
 599 struct target_waitstatus;
 600 struct cmd_list_element;
 601
 602 extern void (*deprecated_pre_add_symbol_hook) (const char *);
 603 extern void (*deprecated_post_add_symbol_hook) (void);
 604 extern void (*selected_frame_level_changed_hook) (int);
 605 extern int (*deprecated_ui_loop_hook) (int signo);
 606 extern void (*deprecated_show_load_progress) (const char *section,
 607                                               unsigned long section_sent,
 608                                               unsigned long section_size,
 609                                               unsigned long total_sent,
 610                                               unsigned long total_size);
 611 extern void (*deprecated_print_frame_info_listing_hook) (struct symtab * s,
 612                                                          int line,
 613                                                          int stopline,
 614                                                          int noerror);
 615 extern int (*deprecated_query_hook) (const char *, va_list)
 616      ATTRIBUTE_FPTR_PRINTF(1,0);
 617 extern void (*deprecated_warning_hook) (const char *, va_list)
 618      ATTRIBUTE_FPTR_PRINTF(1,0);
 619 extern void (*deprecated_interactive_hook) (void);
 620 extern void (*deprecated_readline_begin_hook) (const char *, ...)
 621      ATTRIBUTE_FPTR_PRINTF_1;
 622 extern char *(*deprecated_readline_hook) (const char *);
 623 extern void (*deprecated_readline_end_hook) (void);
 624 extern void (*deprecated_context_hook) (int);
 625 extern ptid_t (*deprecated_target_wait_hook) (ptid_t ptid,
 626                                               struct target_waitstatus *status,
 627                                               int options);
 628
 629 extern void (*deprecated_attach_hook) (void);
 630 extern void (*deprecated_detach_hook) (void);
 631 extern void (*deprecated_call_command_hook) (struct cmd_list_element * c,
 632                                              const char *cmd, int from_tty);
 633
 634 extern int (*deprecated_ui_load_progress_hook) (const char *section,
 635                                                 unsigned long num);
 636
 637 /* If this definition isn't overridden by the header files, assume
 638    that isatty and fileno exist on this system.  */
 639 #ifndef ISATTY
 640 #define ISATTY(FP)      (isatty (fileno (FP)))
 641 #endif
 642
 643 /* * A width that can achieve a better legibility for GDB MI mode.  */
 644 #define GDB_MI_MSG_WIDTH  80
 645
 646 /* From progspace.c */
 647
 648 extern void initialize_progspace (void);
 649 extern void initialize_inferiors (void);
 650
 651 /* * Special block numbers */
 652
 653 enum block_enum
 654 {
 655   GLOBAL_BLOCK = 0,
 656   STATIC_BLOCK = 1,
 657   FIRST_LOCAL_BLOCK = 2
 658 };
 659
 660 /* User selection used in observable.h and multiple print functions.  */
 661
 662 enum user_selected_what_flag
 663   {
 664     /* Inferior selected.  */
 665     USER_SELECTED_INFERIOR = 1 << 1,
 666
 667     /* Thread selected.  */
 668     USER_SELECTED_THREAD = 1 << 2,
 669
 670     /* Frame selected.  */
 671     USER_SELECTED_FRAME = 1 << 3
 672   };
 673 DEF_ENUM_FLAGS_TYPE (enum user_selected_what_flag, user_selected_what);
 674
 675 #include "utils.h"
 676
 677 #endif /* #ifndef DEFS_H */