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) 1986-2017 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 /* Do a strncmp() type operation on STRING1 and STRING2, ignoring any
  35    differences in whitespace.  STRING2_LEN is STRING2's length.
  36    Returns 0 if STRING1 matches STRING2_LEN characters of STRING2,
  37    non-zero otherwise (slightly different than strncmp()'s range of
  38    return values).  */
  39 extern int strncmp_iw (const char *string1, const char *string2,
  40                        size_t string2_len);
  41
  42 /* Do a strcmp() type operation on STRING1 and STRING2, ignoring any
  43    differences in whitespace.  Returns 0 if they match, non-zero if
  44    they don't (slightly different than strcmp()'s range of return
  45    values).
  46
  47    As an extra hack, string1=="FOO(ARGS)" matches string2=="FOO".
  48    This "feature" is useful when searching for matching C++ function
  49    names (such as if the user types 'break FOO', where FOO is a
  50    mangled C++ function).  */
  51 extern int strcmp_iw (const char *string1, const char *string2);
  52
  53 extern int strcmp_iw_ordered (const char *, const char *);
  54
  55 extern int streq (const char *, const char *);
  56
  57 extern int subset_compare (const char *, const char *);
  58
  59 int compare_positive_ints (const void *ap, const void *bp);
  60 int compare_strings (const void *ap, const void *bp);
  61
  62 /* Compare C strings for std::sort.  */
  63
  64 static inline bool
  65 compare_cstrings (const char *str1, const char *str2)
  66 {
  67   return strcmp (str1, str2) < 0;
  68 }
  69
  70 /* A wrapper for bfd_errmsg to produce a more helpful error message
  71    in the case of bfd_error_file_ambiguously recognized.
  72    MATCHING, if non-NULL, is the corresponding argument to
  73    bfd_check_format_matches, and will be freed.  */
  74
  75 extern const char *gdb_bfd_errmsg (bfd_error_type error_tag, char **matching);
  76
  77 /* Reset the prompt_for_continue clock.  */
  78 void reset_prompt_for_continue_wait_time (void);
  79 /* Return the time spent in prompt_for_continue.  */
  80 std::chrono::steady_clock::duration get_prompt_for_continue_wait_time ();
  81 \f
  82 /* Parsing utilites.  */
  83
  84 extern int parse_pid_to_attach (const char *args);
  85
  86 extern int parse_escape (struct gdbarch *, const char **);
  87
  88 /* A wrapper for an array of char* that was allocated in the way that
  89    'buildargv' does, and should be freed with 'freeargv'.  */
  90
  91 class gdb_argv
  92 {
  93 public:
  94
  95   /* A constructor that initializes to NULL.  */
  96
  97   gdb_argv ()
  98     : m_argv (NULL)
  99   {
 100   }
 101
 102   /* A constructor that calls buildargv on STR.  STR may be NULL, in
 103      which case this object is initialized with a NULL array.  If
 104      buildargv fails due to out-of-memory, call malloc_failure.
 105      Therefore, the value is guaranteed to be non-NULL, unless the
 106      parameter itself is NULL.  */
 107
 108   explicit gdb_argv (const char *str)
 109     : m_argv (NULL)
 110   {
 111     reset (str);
 112   }
 113
 114   /* A constructor that takes ownership of an existing array.  */
 115
 116   explicit gdb_argv (char **array)
 117     : m_argv (array)
 118   {
 119   }
 120
 121   gdb_argv (const gdb_argv &) = delete;
 122   gdb_argv &operator= (const gdb_argv &) = delete;
 123
 124   ~gdb_argv ()
 125   {
 126     freeargv (m_argv);
 127   }
 128
 129   /* Call buildargv on STR, storing the result in this object.  Any
 130      previous state is freed.  STR may be NULL, in which case this
 131      object is reset with a NULL array.  If buildargv fails due to
 132      out-of-memory, call malloc_failure.  Therefore, the value is
 133      guaranteed to be non-NULL, unless the parameter itself is
 134      NULL.  */
 135
 136   void reset (const char *str);
 137
 138   /* Return the underlying array.  */
 139
 140   char **get ()
 141   {
 142     return m_argv;
 143   }
 144
 145   /* Return the underlying array, transferring ownership to the
 146      caller.  */
 147
 148   char **release ()
 149   {
 150     char **result = m_argv;
 151     m_argv = NULL;
 152     return result;
 153   }
 154
 155   /* Return the number of items in the array.  */
 156
 157   int count () const
 158   {
 159     return countargv (m_argv);
 160   }
 161
 162   /* Index into the array.  */
 163
 164   char *operator[] (int arg)
 165   {
 166     gdb_assert (m_argv != NULL);
 167     return m_argv[arg];
 168   }
 169
 170   /* The iterator type.  */
 171
 172   typedef char **iterator;
 173
 174   /* Return an iterator pointing to the start of the array.  */
 175
 176   iterator begin ()
 177   {
 178     return m_argv;
 179   }
 180
 181   /* Return an iterator pointing to the end of the array.  */
 182
 183   iterator end ()
 184   {
 185     return m_argv + count ();
 186   }
 187
 188   bool operator!= (std::nullptr_t)
 189   {
 190     return m_argv != NULL;
 191   }
 192
 193   bool operator== (std::nullptr_t)
 194   {
 195     return m_argv == NULL;
 196   }
 197
 198 private:
 199
 200   /* The wrapped array.  */
 201
 202   char **m_argv;
 203 };
 204
 205 \f
 206 /* Cleanup utilities.  */
 207
 208 struct ui_out;
 209 extern struct cleanup *
 210   make_cleanup_ui_out_redirect_pop (struct ui_out *uiout);
 211
 212 struct section_addr_info;
 213 extern struct cleanup *(make_cleanup_free_section_addr_info
 214                         (struct section_addr_info *));
 215
 216 /* For make_cleanup_close see common/filestuff.h.  */
 217
 218 extern struct cleanup *make_cleanup_restore_integer (int *variable);
 219 extern struct cleanup *make_cleanup_restore_uinteger (unsigned int *variable);
 220
 221 struct target_ops;
 222 extern struct cleanup *make_cleanup_unpush_target (struct target_ops *ops);
 223
 224 extern struct cleanup *make_cleanup_value_free_to_mark (struct value *);
 225 extern struct cleanup *make_cleanup_value_free (struct value *);
 226
 227 /* A deleter for a hash table.  */
 228 struct htab_deleter
 229 {
 230   void operator() (htab *ptr) const
 231   {
 232     htab_delete (ptr);
 233   }
 234 };
 235
 236 /* A unique_ptr wrapper for htab_t.  */
 237 typedef std::unique_ptr<htab, htab_deleter> htab_up;
 238
 239 struct parser_state;
 240 extern struct cleanup *make_cleanup_clear_parser_state
 241   (struct parser_state **p);
 242
 243 extern void free_current_contents (void *);
 244
 245 extern void init_page_info (void);
 246
 247 extern struct cleanup *make_cleanup_restore_page_info (void);
 248 extern struct cleanup *
 249   set_batch_flag_and_make_cleanup_restore_page_info (void);
 250
 251 extern struct cleanup *make_bpstat_clear_actions_cleanup (void);
 252 \f
 253 /* Path utilities.  */
 254
 255 extern char *gdb_realpath (const char *);
 256
 257 extern char *gdb_realpath_keepfile (const char *);
 258
 259 extern char *gdb_abspath (const char *);
 260
 261 extern int gdb_filename_fnmatch (const char *pattern, const char *string,
 262                                  int flags);
 263
 264 extern void substitute_path_component (char **stringp, const char *from,
 265                                        const char *to);
 266
 267 std::string ldirname (const char *filename);
 268
 269 extern int count_path_elements (const char *path);
 270
 271 extern const char *strip_leading_path_elements (const char *path, int n);
 272 \f
 273 /* GDB output, ui_file utilities.  */
 274
 275 struct ui_file;
 276
 277 extern int query (const char *, ...) ATTRIBUTE_PRINTF (1, 2);
 278 extern int nquery (const char *, ...) ATTRIBUTE_PRINTF (1, 2);
 279 extern int yquery (const char *, ...) ATTRIBUTE_PRINTF (1, 2);
 280
 281 extern void begin_line (void);
 282
 283 extern void wrap_here (const char *);
 284
 285 extern void reinitialize_more_filter (void);
 286
 287 extern int pagination_enabled;
 288
 289 extern struct ui_file **current_ui_gdb_stdout_ptr (void);
 290 extern struct ui_file **current_ui_gdb_stdin_ptr (void);
 291 extern struct ui_file **current_ui_gdb_stderr_ptr (void);
 292 extern struct ui_file **current_ui_gdb_stdlog_ptr (void);
 293
 294 /* The current top level's ui_file streams.  */
 295
 296 /* Normal results */
 297 #define gdb_stdout (*current_ui_gdb_stdout_ptr ())
 298 /* Input stream */
 299 #define gdb_stdin (*current_ui_gdb_stdin_ptr ())
 300 /* Serious error notifications */
 301 #define gdb_stderr (*current_ui_gdb_stderr_ptr ())
 302 /* Log/debug/trace messages that should bypass normal stdout/stderr
 303    filtering.  For moment, always call this stream using
 304    *_unfiltered.  In the very near future that restriction shall be
 305    removed - either call shall be unfiltered.  (cagney 1999-06-13).  */
 306 #define gdb_stdlog (*current_ui_gdb_stdlog_ptr ())
 307
 308 /* Truly global ui_file streams.  These are all defined in main.c.  */
 309
 310 /* Target output that should bypass normal stdout/stderr filtering.
 311    For moment, always call this stream using *_unfiltered.  In the
 312    very near future that restriction shall be removed - either call
 313    shall be unfiltered.  (cagney 1999-07-02).  */
 314 extern struct ui_file *gdb_stdtarg;
 315 extern struct ui_file *gdb_stdtargerr;
 316 extern struct ui_file *gdb_stdtargin;
 317
 318 /* Set the screen dimensions to WIDTH and HEIGHT.  */
 319
 320 extern void set_screen_width_and_height (int width, int height);
 321
 322 /* More generic printf like operations.  Filtered versions may return
 323    non-locally on error.  */
 324
 325 extern void fputs_filtered (const char *, struct ui_file *);
 326
 327 extern void fputs_unfiltered (const char *, struct ui_file *);
 328
 329 extern int fputc_filtered (int c, struct ui_file *);
 330
 331 extern int fputc_unfiltered (int c, struct ui_file *);
 332
 333 extern int putchar_filtered (int c);
 334
 335 extern int putchar_unfiltered (int c);
 336
 337 extern void puts_filtered (const char *);
 338
 339 extern void puts_unfiltered (const char *);
 340
 341 extern void puts_filtered_tabular (char *string, int width, int right);
 342
 343 extern void puts_debug (char *prefix, char *string, char *suffix);
 344
 345 extern void vprintf_filtered (const char *, va_list) ATTRIBUTE_PRINTF (1, 0);
 346
 347 extern void vfprintf_filtered (struct ui_file *, const char *, va_list)
 348   ATTRIBUTE_PRINTF (2, 0);
 349
 350 extern void fprintf_filtered (struct ui_file *, const char *, ...)
 351   ATTRIBUTE_PRINTF (2, 3);
 352
 353 extern void fprintfi_filtered (int, struct ui_file *, const char *, ...)
 354   ATTRIBUTE_PRINTF (3, 4);
 355
 356 extern void printf_filtered (const char *, ...) ATTRIBUTE_PRINTF (1, 2);
 357
 358 extern void printfi_filtered (int, const char *, ...) ATTRIBUTE_PRINTF (2, 3);
 359
 360 extern void vprintf_unfiltered (const char *, va_list) ATTRIBUTE_PRINTF (1, 0);
 361
 362 extern void vfprintf_unfiltered (struct ui_file *, const char *, va_list)
 363   ATTRIBUTE_PRINTF (2, 0);
 364
 365 extern void fprintf_unfiltered (struct ui_file *, const char *, ...)
 366   ATTRIBUTE_PRINTF (2, 3);
 367
 368 extern void printf_unfiltered (const char *, ...) ATTRIBUTE_PRINTF (1, 2);
 369
 370 extern void print_spaces (int, struct ui_file *);
 371
 372 extern void print_spaces_filtered (int, struct ui_file *);
 373
 374 extern char *n_spaces (int);
 375
 376 extern void fputstr_filtered (const char *str, int quotr,
 377                               struct ui_file * stream);
 378
 379 extern void fputstr_unfiltered (const char *str, int quotr,
 380                                 struct ui_file * stream);
 381
 382 extern void fputstrn_filtered (const char *str, int n, int quotr,
 383                                struct ui_file * stream);
 384
 385 extern void fputstrn_unfiltered (const char *str, int n, int quotr,
 386                                  struct ui_file * stream);
 387
 388 /* Return nonzero if filtered printing is initialized.  */
 389 extern int filtered_printing_initialized (void);
 390
 391 /* Display the host ADDR on STREAM formatted as ``0x%x''.  */
 392 extern void gdb_print_host_address_1 (const void *addr, struct ui_file *stream);
 393
 394 /* Wrapper that avoids adding a pointless cast to all callers.  */
 395 #define gdb_print_host_address(ADDR, STREAM) \
 396   gdb_print_host_address_1 ((const void *) ADDR, STREAM)
 397
 398 /* Convert CORE_ADDR to string in platform-specific manner.
 399    This is usually formatted similar to 0x%lx.  */
 400 extern const char *paddress (struct gdbarch *gdbarch, CORE_ADDR addr);
 401
 402 /* Return a string representation in hexadecimal notation of ADDRESS,
 403    which is suitable for printing.  */
 404
 405 extern const char *print_core_address (struct gdbarch *gdbarch,
 406                                        CORE_ADDR address);
 407
 408 /* Callback hash_f and eq_f for htab_create_alloc or htab_create_alloc_ex.  */
 409 extern hashval_t core_addr_hash (const void *ap);
 410 extern int core_addr_eq (const void *ap, const void *bp);
 411
 412 extern CORE_ADDR string_to_core_addr (const char *my_string);
 413
 414 extern void fprintf_symbol_filtered (struct ui_file *, const char *,
 415                                      enum language, int);
 416
 417 extern void throw_perror_with_name (enum errors errcode, const char *string)
 418   ATTRIBUTE_NORETURN;
 419
 420 extern void perror_warning_with_name (const char *string);
 421
 422 extern void print_sys_errmsg (const char *, int);
 423 \f
 424 /* Warnings and error messages.  */
 425
 426 extern void (*deprecated_error_begin_hook) (void);
 427
 428 /* Message to be printed before the warning message, when a warning occurs.  */
 429
 430 extern const char *warning_pre_print;
 431
 432 extern void error_stream (const string_file &) ATTRIBUTE_NORETURN;
 433
 434 extern void demangler_vwarning (const char *file, int line,
 435                                const char *, va_list ap)
 436      ATTRIBUTE_PRINTF (3, 0);
 437
 438 extern void demangler_warning (const char *file, int line,
 439                               const char *, ...) ATTRIBUTE_PRINTF (3, 4);
 440
 441 \f
 442 /* Misc. utilities.  */
 443
 444 /* Allocation and deallocation functions for the libiberty hash table
 445    which use obstacks.  */
 446 void *hashtab_obstack_allocate (void *data, size_t size, size_t count);
 447 void dummy_obstack_deallocate (void *object, void *data);
 448
 449 #ifdef HAVE_WAITPID
 450 extern pid_t wait_to_die_with_timeout (pid_t pid, int *status, int timeout);
 451 #endif
 452
 453 extern int producer_is_gcc_ge_4 (const char *producer);
 454 extern int producer_is_gcc (const char *producer, int *major, int *minor);
 455
 456 extern int myread (int, char *, int);
 457
 458 /* Ensure that V is aligned to an N byte boundary (B's assumed to be a
 459    power of 2).  Round up/down when necessary.  Examples of correct
 460    use include:
 461
 462    addr = align_up (addr, 8); -- VALUE needs 8 byte alignment
 463    write_memory (addr, value, len);
 464    addr += len;
 465
 466    and:
 467
 468    sp = align_down (sp - len, 16); -- Keep SP 16 byte aligned
 469    write_memory (sp, value, len);
 470
 471    Note that uses such as:
 472
 473    write_memory (addr, value, len);
 474    addr += align_up (len, 8);
 475
 476    and:
 477
 478    sp -= align_up (len, 8);
 479    write_memory (sp, value, len);
 480
 481    are typically not correct as they don't ensure that the address (SP
 482    or ADDR) is correctly aligned (relying on previous alignment to
 483    keep things right).  This is also why the methods are called
 484    "align_..." instead of "round_..." as the latter reads better with
 485    this incorrect coding style.  */
 486
 487 extern ULONGEST align_up (ULONGEST v, int n);
 488 extern ULONGEST align_down (ULONGEST v, int n);
 489
 490 /* Resource limits used by getrlimit and setrlimit.  */
 491
 492 enum resource_limit_kind
 493   {
 494     LIMIT_CUR,
 495     LIMIT_MAX
 496   };
 497
 498 /* Check whether GDB will be able to dump core using the dump_core
 499    function.  Returns zero if GDB cannot or should not dump core.
 500    If LIMIT_KIND is LIMIT_CUR the user's soft limit will be respected.
 501    If LIMIT_KIND is LIMIT_MAX only the hard limit will be respected.  */
 502
 503 extern int can_dump_core (enum resource_limit_kind limit_kind);
 504
 505 /* Print a warning that we cannot dump core.  */
 506
 507 extern void warn_cant_dump_core (const char *reason);
 508
 509 /* Dump core trying to increase the core soft limit to hard limit
 510    first.  */
 511
 512 extern void dump_core (void);
 513
 514 /* Return the hex string form of LENGTH bytes of DATA.
 515    Space for the result is malloc'd, caller must free.  */
 516
 517 extern char *make_hex_string (const gdb_byte *data, size_t length);
 518
 519 #endif /* UTILS_H */