gdb/symfile-debug.c

   1 /* Debug logging for the symbol file functions for the GNU debugger, GDB.
   2
   3    Copyright (C) 2013-2014 Free Software Foundation, Inc.
   4
   5    Contributed by Cygnus Support, using pieces from other GDB modules.
   6
   7    This file is part of GDB.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  21
  22 /* Note: Be careful with functions that can throw errors.
  23    We want to see a logging message regardless of whether an error was thrown.
  24    This typically means printing a message before calling the real function
  25    and then if the function returns a result printing a message after it
  26    returns.  */
  27
  28 #include "defs.h"
  29 #include "gdbcmd.h"
  30 #include "objfiles.h"
  31 #include "observer.h"
  32 #include "source.h"
  33 #include "symtab.h"
  34 #include "symfile.h"
  35
  36 /* We need to save a pointer to the real symbol functions.
  37    Plus, the debug versions are malloc'd because we have to NULL out the
  38    ones that are NULL in the real copy.  */
  39
  40 struct debug_sym_fns_data
  41 {
  42   const struct sym_fns *real_sf;
  43   struct sym_fns debug_sf;
  44 };
  45
  46 /* We need to record a pointer to the real set of functions for each
  47    objfile.  */
  48 static const struct objfile_data *symfile_debug_objfile_data_key;
  49
  50 /* If non-zero all calls to the symfile functions are logged.  */
  51 static int debug_symfile = 0;
  52
  53 /* Return non-zero if symfile debug logging is installed.  */
  54
  55 static int
  56 symfile_debug_installed (struct objfile *objfile)
  57 {
  58   return (objfile->sf != NULL
  59           && objfile_data (objfile, symfile_debug_objfile_data_key) != NULL);
  60 }
  61
  62 /* Utility to return the name to print for OBJFILE.  */
  63
  64 static const char *
  65 debug_objfile_name (const struct objfile *objfile)
  66 {
  67   return lbasename (objfile->original_name);
  68 }
  69
  70 /* Utility return the name to print for SYMTAB.  */
  71
  72 static const char *
  73 debug_symtab_name (struct symtab *symtab)
  74 {
  75   return symtab_to_filename_for_display (symtab);
  76 }
  77 \f
  78 /* Debugging version of struct quick_symbol_functions.  */
  79
  80 static int
  81 debug_qf_has_symbols (struct objfile *objfile)
  82 {
  83   const struct debug_sym_fns_data *debug_data =
  84     objfile_data (objfile, symfile_debug_objfile_data_key);
  85   int retval;
  86
  87   retval = debug_data->real_sf->qf->has_symbols (objfile);
  88
  89   fprintf_filtered (gdb_stdlog, "qf->has_symbols (%s) = %d\n",
  90                     debug_objfile_name (objfile), retval);
  91
  92   return retval;
  93 }
  94
  95 static struct symtab *
  96 debug_qf_find_last_source_symtab (struct objfile *objfile)
  97 {
  98   const struct debug_sym_fns_data *debug_data =
  99     objfile_data (objfile, symfile_debug_objfile_data_key);
 100   struct symtab *retval;
 101
 102   fprintf_filtered (gdb_stdlog, "qf->find_last_source_symtab (%s)\n",
 103                     debug_objfile_name (objfile));
 104
 105   retval = debug_data->real_sf->qf->find_last_source_symtab (objfile);
 106
 107   fprintf_filtered (gdb_stdlog, "qf->find_last_source_symtab (...) = %s\n",
 108                     retval ? debug_symtab_name (retval) : "NULL");
 109
 110   return retval;
 111 }
 112
 113 static void
 114 debug_qf_forget_cached_source_info (struct objfile *objfile)
 115 {
 116   const struct debug_sym_fns_data *debug_data =
 117     objfile_data (objfile, symfile_debug_objfile_data_key);
 118
 119   fprintf_filtered (gdb_stdlog, "qf->forget_cached_source_info (%s)\n",
 120                     debug_objfile_name (objfile));
 121
 122   debug_data->real_sf->qf->forget_cached_source_info (objfile);
 123 }
 124
 125 static int
 126 debug_qf_map_symtabs_matching_filename (struct objfile *objfile,
 127                                         const char *name,
 128                                         const char *real_path,
 129                                         int (*callback) (struct symtab *,
 130                                                          void *),
 131                                         void *data)
 132 {
 133   const struct debug_sym_fns_data *debug_data =
 134     objfile_data (objfile, symfile_debug_objfile_data_key);
 135   int retval;
 136
 137   fprintf_filtered (gdb_stdlog,
 138                     "qf->map_symtabs_matching_filename (%s, \"%s\", \"%s\", %s, %s)\n",
 139                     debug_objfile_name (objfile), name,
 140                     real_path ? real_path : NULL,
 141                     host_address_to_string (callback),
 142                     host_address_to_string (data));
 143
 144   retval = debug_data->real_sf->qf->map_symtabs_matching_filename
 145     (objfile, name, real_path, callback, data);
 146
 147   fprintf_filtered (gdb_stdlog,
 148                     "qf->map_symtabs_matching_filename (...) = %d\n",
 149                     retval);
 150
 151   return retval;
 152 }
 153
 154 static struct symtab *
 155 debug_qf_lookup_symbol (struct objfile *objfile, int kind, const char *name,
 156                         domain_enum domain)
 157 {
 158   const struct debug_sym_fns_data *debug_data =
 159     objfile_data (objfile, symfile_debug_objfile_data_key);
 160   struct symtab *retval;
 161
 162   fprintf_filtered (gdb_stdlog,
 163                     "qf->lookup_symbol (%s, %d, \"%s\", %s)\n",
 164                     debug_objfile_name (objfile), kind, name,
 165                     domain_name (domain));
 166
 167   retval = debug_data->real_sf->qf->lookup_symbol (objfile, kind, name,
 168                                                    domain);
 169
 170   fprintf_filtered (gdb_stdlog, "qf->lookup_symbol (...) = %s\n",
 171                     retval ? debug_symtab_name (retval) : "NULL");
 172
 173   return retval;
 174 }
 175
 176 static void
 177 debug_qf_print_stats (struct objfile *objfile)
 178 {
 179   const struct debug_sym_fns_data *debug_data =
 180     objfile_data (objfile, symfile_debug_objfile_data_key);
 181
 182   fprintf_filtered (gdb_stdlog, "qf->print_stats (%s)\n",
 183                     debug_objfile_name (objfile));
 184
 185   debug_data->real_sf->qf->print_stats (objfile);
 186 }
 187
 188 static void
 189 debug_qf_dump (struct objfile *objfile)
 190 {
 191   const struct debug_sym_fns_data *debug_data =
 192     objfile_data (objfile, symfile_debug_objfile_data_key);
 193
 194   fprintf_filtered (gdb_stdlog, "qf->dump (%s)\n",
 195                     debug_objfile_name (objfile));
 196
 197   debug_data->real_sf->qf->dump (objfile);
 198 }
 199
 200 static void
 201 debug_qf_relocate (struct objfile *objfile,
 202                    const struct section_offsets *new_offsets,
 203                    const struct section_offsets *delta)
 204 {
 205   const struct debug_sym_fns_data *debug_data =
 206     objfile_data (objfile, symfile_debug_objfile_data_key);
 207
 208   fprintf_filtered (gdb_stdlog, "qf->relocate (%s, %s, %s)\n",
 209                     debug_objfile_name (objfile),
 210                     host_address_to_string (new_offsets),
 211                     host_address_to_string (delta));
 212
 213   debug_data->real_sf->qf->relocate (objfile, new_offsets, delta);
 214 }
 215
 216 static void
 217 debug_qf_expand_symtabs_for_function (struct objfile *objfile,
 218                                       const char *func_name)
 219 {
 220   const struct debug_sym_fns_data *debug_data =
 221     objfile_data (objfile, symfile_debug_objfile_data_key);
 222
 223   fprintf_filtered (gdb_stdlog,
 224                     "qf->expand_symtabs_for_function (%s, \"%s\")\n",
 225                     debug_objfile_name (objfile), func_name);
 226
 227   debug_data->real_sf->qf->expand_symtabs_for_function (objfile, func_name);
 228 }
 229
 230 static void
 231 debug_qf_expand_all_symtabs (struct objfile *objfile)
 232 {
 233   const struct debug_sym_fns_data *debug_data =
 234     objfile_data (objfile, symfile_debug_objfile_data_key);
 235
 236   fprintf_filtered (gdb_stdlog, "qf->expand_all_symtabs (%s)\n",
 237                     debug_objfile_name (objfile));
 238
 239   debug_data->real_sf->qf->expand_all_symtabs (objfile);
 240 }
 241
 242 static void
 243 debug_qf_expand_symtabs_with_fullname (struct objfile *objfile,
 244                                        const char *fullname)
 245 {
 246   const struct debug_sym_fns_data *debug_data =
 247     objfile_data (objfile, symfile_debug_objfile_data_key);
 248
 249   fprintf_filtered (gdb_stdlog,
 250                     "qf->expand_symtabs_with_fullname (%s, \"%s\")\n",
 251                     debug_objfile_name (objfile), fullname);
 252
 253   debug_data->real_sf->qf->expand_symtabs_with_fullname (objfile, fullname);
 254 }
 255
 256 static void
 257 debug_qf_map_matching_symbols (struct objfile *objfile,
 258                                const char *name, domain_enum namespace,
 259                                int global,
 260                                int (*callback) (struct block *,
 261                                                 struct symbol *, void *),
 262                                void *data,
 263                                symbol_compare_ftype *match,
 264                                symbol_compare_ftype *ordered_compare)
 265 {
 266   const struct debug_sym_fns_data *debug_data =
 267     objfile_data (objfile, symfile_debug_objfile_data_key);
 268
 269   fprintf_filtered (gdb_stdlog,
 270                     "qf->map_matching_symbols (%s, \"%s\", %s, %d, %s, %s, %s, %s)\n",
 271                     debug_objfile_name (objfile), name,
 272                     domain_name (namespace), global,
 273                     host_address_to_string (callback),
 274                     host_address_to_string (data),
 275                     host_address_to_string (match),
 276                     host_address_to_string (ordered_compare));
 277
 278   debug_data->real_sf->qf->map_matching_symbols (objfile, name,
 279                                                  namespace, global,
 280                                                  callback, data,
 281                                                  match,
 282                                                  ordered_compare);
 283 }
 284
 285 static void
 286 debug_qf_expand_symtabs_matching
 287   (struct objfile *objfile,
 288    expand_symtabs_file_matcher_ftype *file_matcher,
 289    expand_symtabs_symbol_matcher_ftype *symbol_matcher,
 290    enum search_domain kind, void *data)
 291 {
 292   const struct debug_sym_fns_data *debug_data =
 293     objfile_data (objfile, symfile_debug_objfile_data_key);
 294
 295   fprintf_filtered (gdb_stdlog,
 296                     "qf->expand_symtabs_matching (%s, %s, %s, %s, %s)\n",
 297                     debug_objfile_name (objfile),
 298                     host_address_to_string (file_matcher),
 299                     host_address_to_string (symbol_matcher),
 300                     search_domain_name (kind),
 301                     host_address_to_string (data));
 302
 303   debug_data->real_sf->qf->expand_symtabs_matching (objfile,
 304                                                     file_matcher,
 305                                                     symbol_matcher,
 306                                                     kind, data);
 307 }
 308
 309 static struct symtab *
 310 debug_qf_find_pc_sect_symtab (struct objfile *objfile,
 311                               struct bound_minimal_symbol msymbol,
 312                               CORE_ADDR pc,
 313                               struct obj_section *section,
 314                               int warn_if_readin)
 315 {
 316   const struct debug_sym_fns_data *debug_data =
 317     objfile_data (objfile, symfile_debug_objfile_data_key);
 318   struct symtab *retval;
 319
 320   fprintf_filtered (gdb_stdlog,
 321                     "qf->find_pc_sect_symtab (%s, %s, %s, %s, %d)\n",
 322                     debug_objfile_name (objfile),
 323                     host_address_to_string (msymbol.minsym),
 324                     hex_string (pc),
 325                     host_address_to_string (section),
 326                     warn_if_readin);
 327
 328   retval = debug_data->real_sf->qf->find_pc_sect_symtab (objfile, msymbol,
 329                                                          pc, section,
 330                                                          warn_if_readin);
 331
 332   fprintf_filtered (gdb_stdlog, "qf->find_pc_sect_symtab (...) = %s\n",
 333                     retval ? debug_symtab_name (retval) : "NULL");
 334
 335   return retval;
 336 }
 337
 338 static void
 339 debug_qf_map_symbol_filenames (struct objfile *objfile,
 340                                symbol_filename_ftype *fun, void *data,
 341                                int need_fullname)
 342 {
 343   const struct debug_sym_fns_data *debug_data =
 344     objfile_data (objfile, symfile_debug_objfile_data_key);
 345   fprintf_filtered (gdb_stdlog,
 346                     "qf->map_symbol_filenames (%s, %s, %s, %d)\n",
 347                     debug_objfile_name (objfile),
 348                     host_address_to_string (fun),
 349                     host_address_to_string (data),
 350                     need_fullname);
 351
 352   debug_data->real_sf->qf->map_symbol_filenames (objfile, fun, data,
 353                                                  need_fullname);
 354 }
 355
 356 static const struct quick_symbol_functions debug_sym_quick_functions =
 357 {
 358   debug_qf_has_symbols,
 359   debug_qf_find_last_source_symtab,
 360   debug_qf_forget_cached_source_info,
 361   debug_qf_map_symtabs_matching_filename,
 362   debug_qf_lookup_symbol,
 363   debug_qf_print_stats,
 364   debug_qf_dump,
 365   debug_qf_relocate,
 366   debug_qf_expand_symtabs_for_function,
 367   debug_qf_expand_all_symtabs,
 368   debug_qf_expand_symtabs_with_fullname,
 369   debug_qf_map_matching_symbols,
 370   debug_qf_expand_symtabs_matching,
 371   debug_qf_find_pc_sect_symtab,
 372   debug_qf_map_symbol_filenames
 373 };
 374 \f
 375 /* Debugging version of struct sym_probe_fns.  */
 376
 377 static VEC (probe_p) *
 378 debug_sym_get_probes (struct objfile *objfile)
 379 {
 380   const struct debug_sym_fns_data *debug_data =
 381     objfile_data (objfile, symfile_debug_objfile_data_key);
 382   VEC (probe_p) *retval;
 383
 384   retval = debug_data->real_sf->sym_probe_fns->sym_get_probes (objfile);
 385
 386   fprintf_filtered (gdb_stdlog,
 387                     "probes->sym_get_probes (%s) = %s\n",
 388                     debug_objfile_name (objfile),
 389                     host_address_to_string (retval));
 390
 391   return retval;
 392 }
 393
 394 static const struct sym_probe_fns debug_sym_probe_fns =
 395 {
 396   debug_sym_get_probes,
 397 };
 398 \f
 399 /* Debugging version of struct sym_fns.  */
 400
 401 static void
 402 debug_sym_new_init (struct objfile *objfile)
 403 {
 404   const struct debug_sym_fns_data *debug_data =
 405     objfile_data (objfile, symfile_debug_objfile_data_key);
 406
 407   fprintf_filtered (gdb_stdlog, "sf->sym_new_init (%s)\n",
 408                     debug_objfile_name (objfile));
 409
 410   debug_data->real_sf->sym_new_init (objfile);
 411 }
 412
 413 static void
 414 debug_sym_init (struct objfile *objfile)
 415 {
 416   const struct debug_sym_fns_data *debug_data =
 417     objfile_data (objfile, symfile_debug_objfile_data_key);
 418
 419   fprintf_filtered (gdb_stdlog, "sf->sym_init (%s)\n",
 420                     debug_objfile_name (objfile));
 421
 422   debug_data->real_sf->sym_init (objfile);
 423 }
 424
 425 static void
 426 debug_sym_read (struct objfile *objfile, int symfile_flags)
 427 {
 428   const struct debug_sym_fns_data *debug_data =
 429     objfile_data (objfile, symfile_debug_objfile_data_key);
 430
 431   fprintf_filtered (gdb_stdlog, "sf->sym_read (%s, 0x%x)\n",
 432                     debug_objfile_name (objfile), symfile_flags);
 433
 434   debug_data->real_sf->sym_read (objfile, symfile_flags);
 435 }
 436
 437 static void
 438 debug_sym_read_psymbols (struct objfile *objfile)
 439 {
 440   const struct debug_sym_fns_data *debug_data =
 441     objfile_data (objfile, symfile_debug_objfile_data_key);
 442
 443   fprintf_filtered (gdb_stdlog, "sf->sym_read_psymbols (%s)\n",
 444                     debug_objfile_name (objfile));
 445
 446   debug_data->real_sf->sym_read_psymbols (objfile);
 447 }
 448
 449 static void
 450 debug_sym_finish (struct objfile *objfile)
 451 {
 452   const struct debug_sym_fns_data *debug_data =
 453     objfile_data (objfile, symfile_debug_objfile_data_key);
 454
 455   fprintf_filtered (gdb_stdlog, "sf->sym_finish (%s)\n",
 456                     debug_objfile_name (objfile));
 457
 458   debug_data->real_sf->sym_finish (objfile);
 459 }
 460
 461 static void
 462 debug_sym_offsets (struct objfile *objfile,
 463                    const struct section_addr_info *info)
 464 {
 465   const struct debug_sym_fns_data *debug_data =
 466     objfile_data (objfile, symfile_debug_objfile_data_key);
 467
 468   fprintf_filtered (gdb_stdlog, "sf->sym_offsets (%s, %s)\n",
 469                     debug_objfile_name (objfile),
 470                     host_address_to_string (info));
 471
 472   debug_data->real_sf->sym_offsets (objfile, info);
 473 }
 474
 475 static struct symfile_segment_data *
 476 debug_sym_segments (bfd *abfd)
 477 {
 478   /* This API function is annoying, it doesn't take a "this" pointer.
 479      Fortunately it is only used in one place where we (re-)lookup the
 480      sym_fns table to use.  Thus we will never be called.  */
 481   gdb_assert_not_reached ("debug_sym_segments called");
 482 }
 483
 484 static void
 485 debug_sym_read_linetable (struct objfile *objfile)
 486 {
 487   const struct debug_sym_fns_data *debug_data =
 488     objfile_data (objfile, symfile_debug_objfile_data_key);
 489
 490   fprintf_filtered (gdb_stdlog, "sf->sym_read_linetable (%s)\n",
 491                     debug_objfile_name (objfile));
 492
 493   debug_data->real_sf->sym_read_linetable (objfile);
 494 }
 495
 496 static bfd_byte *
 497 debug_sym_relocate (struct objfile *objfile, asection *sectp, bfd_byte *buf)
 498 {
 499   const struct debug_sym_fns_data *debug_data =
 500     objfile_data (objfile, symfile_debug_objfile_data_key);
 501   bfd_byte *retval;
 502
 503   retval = debug_data->real_sf->sym_relocate (objfile, sectp, buf);
 504
 505   fprintf_filtered (gdb_stdlog,
 506                     "sf->sym_relocate (%s, %s, %s) = %s\n",
 507                     debug_objfile_name (objfile),
 508                     host_address_to_string (sectp),
 509                     host_address_to_string (buf),
 510                     host_address_to_string (retval));
 511
 512   return retval;
 513 }
 514
 515 /* Template of debugging version of struct sym_fns.
 516    A copy is made, with sym_flavour updated, and a pointer to the real table
 517    installed in real_sf, and then a pointer to the copy is installed in the
 518    objfile.  */
 519
 520 static const struct sym_fns debug_sym_fns =
 521 {
 522   debug_sym_new_init,
 523   debug_sym_init,
 524   debug_sym_read,
 525   debug_sym_read_psymbols,
 526   debug_sym_finish,
 527   debug_sym_offsets,
 528   debug_sym_segments,
 529   debug_sym_read_linetable,
 530   debug_sym_relocate,
 531   &debug_sym_probe_fns,
 532   &debug_sym_quick_functions
 533 };
 534 \f
 535 /* Free the copy of sym_fns recorded in the registry.  */
 536
 537 static void
 538 symfile_debug_free_objfile (struct objfile *objfile, void *datum)
 539 {
 540   xfree (datum);
 541 }
 542
 543 /* Install the debugging versions of the symfile functions for OBJFILE.
 544    Do not call this if the debug versions are already installed.  */
 545
 546 static void
 547 install_symfile_debug_logging (struct objfile *objfile)
 548 {
 549   const struct sym_fns *real_sf;
 550   struct debug_sym_fns_data *debug_data;
 551
 552   /* The debug versions should not already be installed.  */
 553   gdb_assert (!symfile_debug_installed (objfile));
 554
 555   real_sf = objfile->sf;
 556
 557   /* Alas we have to preserve NULL entries in REAL_SF.  */
 558   debug_data = XCNEW (struct debug_sym_fns_data);
 559
 560 #define COPY_SF_PTR(from, to, name, func)       \
 561   do {                                          \
 562     if ((from)->name)                           \
 563       (to)->debug_sf.name = func;               \
 564   } while (0)
 565
 566   COPY_SF_PTR (real_sf, debug_data, sym_new_init, debug_sym_new_init);
 567   COPY_SF_PTR (real_sf, debug_data, sym_init, debug_sym_init);
 568   COPY_SF_PTR (real_sf, debug_data, sym_read, debug_sym_read);
 569   COPY_SF_PTR (real_sf, debug_data, sym_read_psymbols,
 570                debug_sym_read_psymbols);
 571   COPY_SF_PTR (real_sf, debug_data, sym_finish, debug_sym_finish);
 572   COPY_SF_PTR (real_sf, debug_data, sym_offsets, debug_sym_offsets);
 573   COPY_SF_PTR (real_sf, debug_data, sym_segments, debug_sym_segments);
 574   COPY_SF_PTR (real_sf, debug_data, sym_read_linetable,
 575                debug_sym_read_linetable);
 576   COPY_SF_PTR (real_sf, debug_data, sym_relocate, debug_sym_relocate);
 577   if (real_sf->sym_probe_fns)
 578     debug_data->debug_sf.sym_probe_fns = &debug_sym_probe_fns;
 579   debug_data->debug_sf.qf = &debug_sym_quick_functions;
 580
 581 #undef COPY_SF_PTR
 582
 583   debug_data->real_sf = real_sf;
 584   set_objfile_data (objfile, symfile_debug_objfile_data_key, debug_data);
 585   objfile->sf = &debug_data->debug_sf;
 586 }
 587
 588 /* Uninstall the debugging versions of the symfile functions for OBJFILE.
 589    Do not call this if the debug versions are not installed.  */
 590
 591 static void
 592 uninstall_symfile_debug_logging (struct objfile *objfile)
 593 {
 594   struct debug_sym_fns_data *debug_data;
 595
 596   /* The debug versions should be currently installed.  */
 597   gdb_assert (symfile_debug_installed (objfile));
 598
 599   debug_data = objfile_data (objfile, symfile_debug_objfile_data_key);
 600
 601   objfile->sf = debug_data->real_sf;
 602   xfree (debug_data);
 603   set_objfile_data (objfile, symfile_debug_objfile_data_key, NULL);
 604 }
 605
 606 /* Call this function to set OBJFILE->SF.
 607    Do not set OBJFILE->SF directly.  */
 608
 609 void
 610 objfile_set_sym_fns (struct objfile *objfile, const struct sym_fns *sf)
 611 {
 612   if (symfile_debug_installed (objfile))
 613     {
 614       gdb_assert (debug_symfile);
 615       /* Remove the current one, and reinstall a new one later.  */
 616       uninstall_symfile_debug_logging (objfile);
 617     }
 618
 619   /* Assume debug logging is disabled.  */
 620   objfile->sf = sf;
 621
 622   /* Turn debug logging on if enabled.  */
 623   if (debug_symfile)
 624     install_symfile_debug_logging (objfile);
 625 }
 626
 627 static void
 628 set_debug_symfile (char *args, int from_tty, struct cmd_list_element *c)
 629 {
 630   struct program_space *pspace;
 631   struct objfile *objfile;
 632
 633   ALL_PSPACES (pspace)
 634     ALL_PSPACE_OBJFILES (pspace, objfile)
 635     {
 636       if (debug_symfile)
 637         {
 638           if (!symfile_debug_installed (objfile))
 639             install_symfile_debug_logging (objfile);
 640         }
 641       else
 642         {
 643           if (symfile_debug_installed (objfile))
 644             uninstall_symfile_debug_logging (objfile);
 645         }
 646     }
 647 }
 648
 649 static void
 650 show_debug_symfile (struct ui_file *file, int from_tty,
 651                         struct cmd_list_element *c, const char *value)
 652 {
 653   fprintf_filtered (file, _("Symfile debugging is %s.\n"), value);
 654 }
 655
 656 initialize_file_ftype _initialize_symfile_debug;
 657
 658 void
 659 _initialize_symfile_debug (void)
 660 {
 661   symfile_debug_objfile_data_key
 662     = register_objfile_data_with_cleanup (NULL, symfile_debug_free_objfile);
 663
 664   add_setshow_boolean_cmd ("symfile", no_class, &debug_symfile, _("\
 665 Set debugging of the symfile functions."), _("\
 666 Show debugging of the symfile functions."), _("\
 667 When enabled, all calls to the symfile functions are logged."),
 668                            set_debug_symfile, show_debug_symfile,
 669                            &setdebuglist, &showdebuglist);
 670
 671   /* Note: We don't need a new-objfile observer because debug logging
 672      will be installed when objfile init'n calls objfile_set_sym_fns.  */
 673 }