gdb/utils.h

   1 /* *INDENT-OFF* */ /* ATTRIBUTE_PRINTF confuses indent, avoid running it
   2                       for now.  */
   3 /* I/O, string, cleanup, and other random utilities for GDB.
   4    Copyright (C) 1986-2019 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 UTILS_H
  22 #define UTILS_H
  23
  24 #include "exceptions.h"
  25 #include "common/scoped_restore.h"
  26 #include <chrono>
  27
  28 extern void initialize_utils (void);
  29
  30 /* String utilities.  */
  31
  32 extern int sevenbit_strings;
  33
  34 /* Modes of operation for strncmp_iw_with_mode.  */
  35
  36 enum class strncmp_iw_mode
  37 {
  38 /* Do a strcmp() type operation on STRING1 and STRING2, ignoring any
  39    differences in whitespace.  Returns 0 if they match, non-zero if
  40    they don't (slightly different than strcmp()'s range of return
  41    values).  */
  42   NORMAL,
  43
  44   /* Like NORMAL, but also apply the strcmp_iw hack.  I.e.,
  45      string1=="FOO(PARAMS)" matches string2=="FOO".  */
  46   MATCH_PARAMS,
  47 };
  48
  49 /* Helper for strcmp_iw and strncmp_iw.  Exported so that languages
  50    can implement both NORMAL and MATCH_PARAMS variants in a single
  51    function and defer part of the work to strncmp_iw_with_mode.
  52
  53    LANGUAGE is used to implement some context-sensitive
  54    language-specific comparisons.  For example, for C++,
  55    "string1=operator()" should not match "string2=operator" even in
  56    MATCH_PARAMS mode.
  57
  58    MATCH_FOR_LCD is passed down so that the function can mark parts of
  59    the symbol name as ignored for completion matching purposes (e.g.,
  60    to handle abi tags).  */
  61 extern int strncmp_iw_with_mode
  62   (const char *string1, const char *string2, size_t string2_len,
  63    strncmp_iw_mode mode, enum language language,
  64    completion_match_for_lcd *match_for_lcd = NULL);
  65
  66 /* Do a strncmp() type operation on STRING1 and STRING2, ignoring any
  67    differences in whitespace.  STRING2_LEN is STRING2's length.
  68    Returns 0 if STRING1 matches STRING2_LEN characters of STRING2,
  69    non-zero otherwise (slightly different than strncmp()'s range of
  70    return values).  Note: passes language_minimal to
  71    strncmp_iw_with_mode, and should therefore be avoided if a more
  72    suitable language is available.  */
  73 extern int strncmp_iw (const char *string1, const char *string2,
  74                        size_t string2_len);
  75
  76 /* Do a strcmp() type operation on STRING1 and STRING2, ignoring any
  77    differences in whitespace.  Returns 0 if they match, non-zero if
  78    they don't (slightly different than strcmp()'s range of return
  79    values).
  80
  81    As an extra hack, string1=="FOO(ARGS)" matches string2=="FOO".
  82    This "feature" is useful when searching for matching C++ function
  83    names (such as if the user types 'break FOO', where FOO is a
  84    mangled C++ function).
  85
  86    Note: passes language_minimal to strncmp_iw_with_mode, and should
  87    therefore be avoided if a more suitable language is available.  */
  88 extern int strcmp_iw (const char *string1, const char *string2);
  89
  90 extern int strcmp_iw_ordered (const char *, const char *);
  91
  92 /* Return true if the strings are equal.  */
  93
  94 extern bool streq (const char *, const char *);
  95
  96 /* A variant of streq that is suitable for use as an htab
  97    callback.  */
  98
  99 extern int streq_hash (const void *, const void *);
 100
 101 extern int subset_compare (const char *, const char *);
 102
 103 int compare_positive_ints (const void *ap, const void *bp);
 104
 105 /* Compare C strings for std::sort.  */
 106
 107 static inline bool
 108 compare_cstrings (const char *str1, const char *str2)
 109 {
 110   return strcmp (str1, str2) < 0;
 111 }
 112
 113 /* A wrapper for bfd_errmsg to produce a more helpful error message
 114    in the case of bfd_error_file_ambiguously recognized.
 115    MATCHING, if non-NULL, is the corresponding argument to
 116    bfd_check_format_matches, and will be freed.  */
 117
 118 extern std::string gdb_bfd_errmsg (bfd_error_type error_tag, char **matching);
 119
 120 /* Reset the prompt_for_continue clock.  */
 121 void reset_prompt_for_continue_wait_time (void);
 122 /* Return the time spent in prompt_for_continue.  */
 123 std::chrono::steady_clock::duration get_prompt_for_continue_wait_time ();
 124 \f
 125 /* Parsing utilites.  */
 126
 127 extern int parse_pid_to_attach (const char *args);
 128
 129 extern int parse_escape (struct gdbarch *, const char **);
 130
 131 /* A wrapper for an array of char* that was allocated in the way that
 132    'buildargv' does, and should be freed with 'freeargv'.  */
 133
 134 class gdb_argv
 135 {
 136 public:
 137
 138   /* A constructor that initializes to NULL.  */
 139
 140   gdb_argv ()
 141     : m_argv (NULL)
 142   {
 143   }
 144
 145   /* A constructor that calls buildargv on STR.  STR may be NULL, in
 146      which case this object is initialized with a NULL array.  If
 147      buildargv fails due to out-of-memory, call malloc_failure.
 148      Therefore, the value is guaranteed to be non-NULL, unless the
 149      parameter itself is NULL.  */
 150
 151   explicit gdb_argv (const char *str)
 152     : m_argv (NULL)
 153   {
 154     reset (str);
 155   }
 156
 157   /* A constructor that takes ownership of an existing array.  */
 158
 159   explicit gdb_argv (char **array)
 160     : m_argv (array)
 161   {
 162   }
 163
 164   gdb_argv (const gdb_argv &) = delete;
 165   gdb_argv &operator= (const gdb_argv &) = delete;
 166
 167   ~gdb_argv ()
 168   {
 169     freeargv (m_argv);
 170   }
 171
 172   /* Call buildargv on STR, storing the result in this object.  Any
 173      previous state is freed.  STR may be NULL, in which case this
 174      object is reset with a NULL array.  If buildargv fails due to
 175      out-of-memory, call malloc_failure.  Therefore, the value is
 176      guaranteed to be non-NULL, unless the parameter itself is
 177      NULL.  */
 178
 179   void reset (const char *str);
 180
 181   /* Return the underlying array.  */
 182
 183   char **get ()
 184   {
 185     return m_argv;
 186   }
 187
 188   /* Return the underlying array, transferring ownership to the
 189      caller.  */
 190
 191   char **release ()
 192   {
 193     char **result = m_argv;
 194     m_argv = NULL;
 195     return result;
 196   }
 197
 198   /* Return the number of items in the array.  */
 199
 200   int count () const
 201   {
 202     return countargv (m_argv);
 203   }
 204
 205   /* Index into the array.  */
 206
 207   char *operator[] (int arg)
 208   {
 209     gdb_assert (m_argv != NULL);
 210     return m_argv[arg];
 211   }
 212
 213   /* The iterator type.  */
 214
 215   typedef char **iterator;
 216
 217   /* Return an iterator pointing to the start of the array.  */
 218
 219   iterator begin ()
 220   {
 221     return m_argv;
 222   }
 223
 224   /* Return an iterator pointing to the end of the array.  */
 225
 226   iterator end ()
 227   {
 228     return m_argv + count ();
 229   }
 230
 231   bool operator!= (std::nullptr_t)
 232   {
 233     return m_argv != NULL;
 234   }
 235
 236   bool operator== (std::nullptr_t)
 237   {
 238     return m_argv == NULL;
 239   }
 240
 241 private:
 242
 243   /* The wrapped array.  */
 244
 245   char **m_argv;
 246 };
 247
 248 \f
 249 /* Cleanup utilities.  */
 250
 251 /* A deleter for a hash table.  */
 252 struct htab_deleter
 253 {
 254   void operator() (htab *ptr) const
 255   {
 256     htab_delete (ptr);
 257   }
 258 };
 259
 260 /* A unique_ptr wrapper for htab_t.  */
 261 typedef std::unique_ptr<htab, htab_deleter> htab_up;
 262
 263 extern void free_current_contents (void *);
 264
 265 extern void init_page_info (void);
 266
 267 /* Temporarily set BATCH_FLAG and the associated unlimited terminal size.
 268    Restore when destroyed.  */
 269
 270 struct set_batch_flag_and_restore_page_info
 271 {
 272 public:
 273
 274   set_batch_flag_and_restore_page_info ();
 275   ~set_batch_flag_and_restore_page_info ();
 276
 277   DISABLE_COPY_AND_ASSIGN (set_batch_flag_and_restore_page_info);
 278
 279 private:
 280
 281   /* Note that this doesn't use scoped_restore, because it's important
 282      to control the ordering of operations in the destruction, and it
 283      was simpler to avoid introducing a new ad hoc class.  */
 284   unsigned m_save_lines_per_page;
 285   unsigned m_save_chars_per_line;
 286   int m_save_batch_flag;
 287 };
 288
 289 \f
 290 /* Path utilities.  */
 291
 292 extern int gdb_filename_fnmatch (const char *pattern, const char *string,
 293                                  int flags);
 294
 295 extern void substitute_path_component (char **stringp, const char *from,
 296                                        const char *to);
 297
 298 std::string ldirname (const char *filename);
 299
 300 extern int count_path_elements (const char *path);
 301
 302 extern const char *strip_leading_path_elements (const char *path, int n);
 303 \f
 304 /* GDB output, ui_file utilities.  */
 305
 306 struct ui_file;
 307
 308 extern int query (const char *, ...) ATTRIBUTE_PRINTF (1, 2);
 309 extern int nquery (const char *, ...) ATTRIBUTE_PRINTF (1, 2);
 310 extern int yquery (const char *, ...) ATTRIBUTE_PRINTF (1, 2);
 311
 312 extern void begin_line (void);
 313
 314 extern void wrap_here (const char *);
 315
 316 extern void reinitialize_more_filter (void);
 317
 318 extern int pagination_enabled;
 319
 320 extern struct ui_file **current_ui_gdb_stdout_ptr (void);
 321 extern struct ui_file **current_ui_gdb_stdin_ptr (void);
 322 extern struct ui_file **current_ui_gdb_stderr_ptr (void);
 323 extern struct ui_file **current_ui_gdb_stdlog_ptr (void);
 324
 325 /* The current top level's ui_file streams.  */
 326
 327 /* Normal results */
 328 #define gdb_stdout (*current_ui_gdb_stdout_ptr ())
 329 /* Input stream */
 330 #define gdb_stdin (*current_ui_gdb_stdin_ptr ())
 331 /* Serious error notifications */
 332 #define gdb_stderr (*current_ui_gdb_stderr_ptr ())
 333 /* Log/debug/trace messages that should bypass normal stdout/stderr
 334    filtering.  For moment, always call this stream using
 335    *_unfiltered.  In the very near future that restriction shall be
 336    removed - either call shall be unfiltered.  (cagney 1999-06-13).  */
 337 #define gdb_stdlog (*current_ui_gdb_stdlog_ptr ())
 338
 339 /* Truly global ui_file streams.  These are all defined in main.c.  */
 340
 341 /* Target output that should bypass normal stdout/stderr filtering.
 342    For moment, always call this stream using *_unfiltered.  In the
 343    very near future that restriction shall be removed - either call
 344    shall be unfiltered.  (cagney 1999-07-02).  */
 345 extern struct ui_file *gdb_stdtarg;
 346 extern struct ui_file *gdb_stdtargerr;
 347 extern struct ui_file *gdb_stdtargin;
 348
 349 /* Set the screen dimensions to WIDTH and HEIGHT.  */
 350
 351 extern void set_screen_width_and_height (int width, int height);
 352
 353 /* More generic printf like operations.  Filtered versions may return
 354    non-locally on error.  */
 355
 356 extern void fputs_filtered (const char *, struct ui_file *);
 357
 358 extern void fputs_unfiltered (const char *, struct ui_file *);
 359
 360 extern int fputc_filtered (int c, struct ui_file *);
 361
 362 extern int fputc_unfiltered (int c, struct ui_file *);
 363
 364 extern int putchar_filtered (int c);
 365
 366 extern int putchar_unfiltered (int c);
 367
 368 extern void puts_filtered (const char *);
 369
 370 extern void puts_unfiltered (const char *);
 371
 372 extern void puts_filtered_tabular (char *string, int width, int right);
 373
 374 extern void puts_debug (char *prefix, char *string, char *suffix);
 375
 376 extern void vprintf_filtered (const char *, va_list) ATTRIBUTE_PRINTF (1, 0);
 377
 378 extern void vfprintf_filtered (struct ui_file *, const char *, va_list)
 379   ATTRIBUTE_PRINTF (2, 0);
 380
 381 extern void fprintf_filtered (struct ui_file *, const char *, ...)
 382   ATTRIBUTE_PRINTF (2, 3);
 383
 384 extern void fprintfi_filtered (int, struct ui_file *, const char *, ...)
 385   ATTRIBUTE_PRINTF (3, 4);
 386
 387 extern void printf_filtered (const char *, ...) ATTRIBUTE_PRINTF (1, 2);
 388
 389 extern void printfi_filtered (int, const char *, ...) ATTRIBUTE_PRINTF (2, 3);
 390
 391 extern void vprintf_unfiltered (const char *, va_list) ATTRIBUTE_PRINTF (1, 0);
 392
 393 extern void vfprintf_unfiltered (struct ui_file *, const char *, va_list)
 394   ATTRIBUTE_PRINTF (2, 0);
 395
 396 extern void fprintf_unfiltered (struct ui_file *, const char *, ...)
 397   ATTRIBUTE_PRINTF (2, 3);
 398
 399 extern void printf_unfiltered (const char *, ...) ATTRIBUTE_PRINTF (1, 2);
 400
 401 extern void print_spaces (int, struct ui_file *);
 402
 403 extern void print_spaces_filtered (int, struct ui_file *);
 404
 405 extern char *n_spaces (int);
 406
 407 extern void fputstr_filtered (const char *str, int quotr,
 408                               struct ui_file * stream);
 409
 410 extern void fputstr_unfiltered (const char *str, int quotr,
 411                                 struct ui_file * stream);
 412
 413 extern void fputstrn_filtered (const char *str, int n, int quotr,
 414                                struct ui_file * stream);
 415
 416 typedef int (*do_fputc_ftype) (int c, ui_file *stream);
 417
 418 extern void fputstrn_unfiltered (const char *str, int n, int quotr,
 419                                  do_fputc_ftype do_fputc,
 420                                  struct ui_file * stream);
 421
 422 /* Return nonzero if filtered printing is initialized.  */
 423 extern int filtered_printing_initialized (void);
 424
 425 /* Like fprintf_filtered, but styles the output according to STYLE,
 426    when appropriate.  */
 427
 428 extern void fprintf_styled (struct ui_file *stream,
 429                             const ui_file_style &style,
 430                             const char *fmt,
 431                             ...)
 432   ATTRIBUTE_PRINTF (3, 4);
 433
 434 /* Like fputs_filtered, but styles the output according to STYLE, when
 435    appropriate.  */
 436
 437 extern void fputs_styled (const char *linebuffer,
 438                           const ui_file_style &style,
 439                           struct ui_file *stream);
 440
 441 /* Reset the terminal style to the default, if needed.  */
 442
 443 extern void reset_terminal_style (struct ui_file *stream);
 444
 445 /* Return true if ANSI escapes can be used on STREAM.  */
 446
 447 extern bool can_emit_style_escape (struct ui_file *stream);
 448
 449 /* Display the host ADDR on STREAM formatted as ``0x%x''.  */
 450 extern void gdb_print_host_address_1 (const void *addr, struct ui_file *stream);
 451
 452 /* Wrapper that avoids adding a pointless cast to all callers.  */
 453 #define gdb_print_host_address(ADDR, STREAM) \
 454   gdb_print_host_address_1 ((const void *) ADDR, STREAM)
 455
 456 /* Return the address only having significant bits.  */
 457 extern CORE_ADDR address_significant (gdbarch *gdbarch, CORE_ADDR addr);
 458
 459 /* Convert CORE_ADDR to string in platform-specific manner.
 460    This is usually formatted similar to 0x%lx.  */
 461 extern const char *paddress (struct gdbarch *gdbarch, CORE_ADDR addr);
 462
 463 /* Return a string representation in hexadecimal notation of ADDRESS,
 464    which is suitable for printing.  */
 465
 466 extern const char *print_core_address (struct gdbarch *gdbarch,
 467                                        CORE_ADDR address);
 468
 469 /* Callback hash_f and eq_f for htab_create_alloc or htab_create_alloc_ex.  */
 470 extern hashval_t core_addr_hash (const void *ap);
 471 extern int core_addr_eq (const void *ap, const void *bp);
 472
 473 extern CORE_ADDR string_to_core_addr (const char *my_string);
 474
 475 extern void fprintf_symbol_filtered (struct ui_file *, const char *,
 476                                      enum language, int);
 477
 478 extern void throw_perror_with_name (enum errors errcode, const char *string)
 479   ATTRIBUTE_NORETURN;
 480
 481 extern void perror_warning_with_name (const char *string);
 482
 483 extern void print_sys_errmsg (const char *, int);
 484 \f
 485 /* Warnings and error messages.  */
 486
 487 extern void (*deprecated_error_begin_hook) (void);
 488
 489 /* Message to be printed before the warning message, when a warning occurs.  */
 490
 491 extern const char *warning_pre_print;
 492
 493 extern void error_stream (const string_file &) ATTRIBUTE_NORETURN;
 494
 495 extern void demangler_vwarning (const char *file, int line,
 496                                const char *, va_list ap)
 497      ATTRIBUTE_PRINTF (3, 0);
 498
 499 extern void demangler_warning (const char *file, int line,
 500                               const char *, ...) ATTRIBUTE_PRINTF (3, 4);
 501
 502 \f
 503 /* Misc. utilities.  */
 504
 505 /* Allocation and deallocation functions for the libiberty hash table
 506    which use obstacks.  */
 507 void *hashtab_obstack_allocate (void *data, size_t size, size_t count);
 508 void dummy_obstack_deallocate (void *object, void *data);
 509
 510 #ifdef HAVE_WAITPID
 511 extern pid_t wait_to_die_with_timeout (pid_t pid, int *status, int timeout);
 512 #endif
 513
 514 extern int myread (int, char *, int);
 515
 516 /* Resource limits used by getrlimit and setrlimit.  */
 517
 518 enum resource_limit_kind
 519   {
 520     LIMIT_CUR,
 521     LIMIT_MAX
 522   };
 523
 524 /* Check whether GDB will be able to dump core using the dump_core
 525    function.  Returns zero if GDB cannot or should not dump core.
 526    If LIMIT_KIND is LIMIT_CUR the user's soft limit will be respected.
 527    If LIMIT_KIND is LIMIT_MAX only the hard limit will be respected.  */
 528
 529 extern int can_dump_core (enum resource_limit_kind limit_kind);
 530
 531 /* Print a warning that we cannot dump core.  */
 532
 533 extern void warn_cant_dump_core (const char *reason);
 534
 535 /* Dump core trying to increase the core soft limit to hard limit
 536    first.  */
 537
 538 extern void dump_core (void);
 539
 540 /* Return the hex string form of LENGTH bytes of DATA.
 541    Space for the result is malloc'd, caller must free.  */
 542
 543 extern char *make_hex_string (const gdb_byte *data, size_t length);
 544
 545 /* Copy NBITS bits from SOURCE to DEST starting at the given bit
 546    offsets.  Use the bit order as specified by BITS_BIG_ENDIAN.
 547    Source and destination buffers must not overlap.  */
 548
 549 extern void copy_bitwise (gdb_byte *dest, ULONGEST dest_offset,
 550                           const gdb_byte *source, ULONGEST source_offset,
 551                           ULONGEST nbits, int bits_big_endian);
 552
 553 #endif /* UTILS_H */