gdb/symfile-debug.c

   1 /* Debug logging for the symbol file functions for the GNU debugger, GDB.
   2
   3    Copyright (C) 2013-2015 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 return the name to print for SYMTAB.  */
  63
  64 static const char *
  65 debug_symtab_name (struct symtab *symtab)
  66 {
  67   return symtab_to_filename_for_display (symtab);
  68 }
  69 \f
  70 /* Debugging version of struct quick_symbol_functions.  */
  71
  72 static int
  73 debug_qf_has_symbols (struct objfile *objfile)
  74 {
  75   const struct debug_sym_fns_data *debug_data =
  76     objfile_data (objfile, symfile_debug_objfile_data_key);
  77   int retval;
  78
  79   retval = debug_data->real_sf->qf->has_symbols (objfile);
  80
  81   fprintf_filtered (gdb_stdlog, "qf->has_symbols (%s) = %d\n",
  82                     objfile_debug_name (objfile), retval);
  83
  84   return retval;
  85 }
  86
  87 static struct symtab *
  88 debug_qf_find_last_source_symtab (struct objfile *objfile)
  89 {
  90   const struct debug_sym_fns_data *debug_data =
  91     objfile_data (objfile, symfile_debug_objfile_data_key);
  92   struct symtab *retval;
  93
  94   fprintf_filtered (gdb_stdlog, "qf->find_last_source_symtab (%s)\n",
  95                     objfile_debug_name (objfile));
  96
  97   retval = debug_data->real_sf->qf->find_last_source_symtab (objfile);
  98
  99   fprintf_filtered (gdb_stdlog, "qf->find_last_source_symtab (...) = %s\n",
 100                     retval ? debug_symtab_name (retval) : "NULL");
 101
 102   return retval;
 103 }
 104
 105 static void
 106 debug_qf_forget_cached_source_info (struct objfile *objfile)
 107 {
 108   const struct debug_sym_fns_data *debug_data =
 109     objfile_data (objfile, symfile_debug_objfile_data_key);
 110
 111   fprintf_filtered (gdb_stdlog, "qf->forget_cached_source_info (%s)\n",
 112                     objfile_debug_name (objfile));
 113
 114   debug_data->real_sf->qf->forget_cached_source_info (objfile);
 115 }
 116
 117 static int
 118 debug_qf_map_symtabs_matching_filename (struct objfile *objfile,
 119                                         const char *name,
 120                                         const char *real_path,
 121                                         int (*callback) (struct symtab *,
 122                                                          void *),
 123                                         void *data)
 124 {
 125   const struct debug_sym_fns_data *debug_data =
 126     objfile_data (objfile, symfile_debug_objfile_data_key);
 127   int retval;
 128
 129   fprintf_filtered (gdb_stdlog,
 130                     "qf->map_symtabs_matching_filename (%s, \"%s\", \"%s\", %s, %s)\n",
 131                     objfile_debug_name (objfile), name,
 132                     real_path ? real_path : NULL,
 133                     host_address_to_string (callback),
 134                     host_address_to_string (data));
 135
 136   retval = debug_data->real_sf->qf->map_symtabs_matching_filename
 137     (objfile, name, real_path, callback, data);
 138
 139   fprintf_filtered (gdb_stdlog,
 140                     "qf->map_symtabs_matching_filename (...) = %d\n",
 141                     retval);
 142
 143   return retval;
 144 }
 145
 146 static struct compunit_symtab *
 147 debug_qf_lookup_symbol (struct objfile *objfile, int kind, const char *name,
 148                         domain_enum domain)
 149 {
 150   const struct debug_sym_fns_data *debug_data =
 151     objfile_data (objfile, symfile_debug_objfile_data_key);
 152   struct compunit_symtab *retval;
 153
 154   fprintf_filtered (gdb_stdlog,
 155                     "qf->lookup_symbol (%s, %d, \"%s\", %s)\n",
 156                     objfile_debug_name (objfile), kind, name,
 157                     domain_name (domain));
 158
 159   retval = debug_data->real_sf->qf->lookup_symbol (objfile, kind, name,
 160                                                    domain);
 161
 162   fprintf_filtered (gdb_stdlog, "qf->lookup_symbol (...) = %s\n",
 163                     retval
 164                     ? debug_symtab_name (compunit_primary_filetab (retval))
 165                     : "NULL");
 166
 167   return retval;
 168 }
 169
 170 static void
 171 debug_qf_print_stats (struct objfile *objfile)
 172 {
 173   const struct debug_sym_fns_data *debug_data =
 174     objfile_data (objfile, symfile_debug_objfile_data_key);
 175
 176   fprintf_filtered (gdb_stdlog, "qf->print_stats (%s)\n",
 177                     objfile_debug_name (objfile));
 178
 179   debug_data->real_sf->qf->print_stats (objfile);
 180 }
 181
 182 static void
 183 debug_qf_dump (struct objfile *objfile)
 184 {
 185   const struct debug_sym_fns_data *debug_data =
 186     objfile_data (objfile, symfile_debug_objfile_data_key);
 187
 188   fprintf_filtered (gdb_stdlog, "qf->dump (%s)\n",
 189                     objfile_debug_name (objfile));
 190
 191   debug_data->real_sf->qf->dump (objfile);
 192 }
 193
 194 static void
 195 debug_qf_relocate (struct objfile *objfile,
 196                    const struct section_offsets *new_offsets,
 197                    const struct section_offsets *delta)
 198 {
 199   const struct debug_sym_fns_data *debug_data =
 200     objfile_data (objfile, symfile_debug_objfile_data_key);
 201
 202   fprintf_filtered (gdb_stdlog, "qf->relocate (%s, %s, %s)\n",
 203                     objfile_debug_name (objfile),
 204                     host_address_to_string (new_offsets),
 205                     host_address_to_string (delta));
 206
 207   debug_data->real_sf->qf->relocate (objfile, new_offsets, delta);
 208 }
 209
 210 static void
 211 debug_qf_expand_symtabs_for_function (struct objfile *objfile,
 212                                       const char *func_name)
 213 {
 214   const struct debug_sym_fns_data *debug_data =
 215     objfile_data (objfile, symfile_debug_objfile_data_key);
 216
 217   fprintf_filtered (gdb_stdlog,
 218                     "qf->expand_symtabs_for_function (%s, \"%s\")\n",
 219                     objfile_debug_name (objfile), func_name);
 220
 221   debug_data->real_sf->qf->expand_symtabs_for_function (objfile, func_name);
 222 }
 223
 224 static void
 225 debug_qf_expand_all_symtabs (struct objfile *objfile)
 226 {
 227   const struct debug_sym_fns_data *debug_data =
 228     objfile_data (objfile, symfile_debug_objfile_data_key);
 229
 230   fprintf_filtered (gdb_stdlog, "qf->expand_all_symtabs (%s)\n",
 231                     objfile_debug_name (objfile));
 232
 233   debug_data->real_sf->qf->expand_all_symtabs (objfile);
 234 }
 235
 236 static void
 237 debug_qf_expand_symtabs_with_fullname (struct objfile *objfile,
 238                                        const char *fullname)
 239 {
 240   const struct debug_sym_fns_data *debug_data =
 241     objfile_data (objfile, symfile_debug_objfile_data_key);
 242
 243   fprintf_filtered (gdb_stdlog,
 244                     "qf->expand_symtabs_with_fullname (%s, \"%s\")\n",
 245                     objfile_debug_name (objfile), fullname);
 246
 247   debug_data->real_sf->qf->expand_symtabs_with_fullname (objfile, fullname);
 248 }
 249
 250 static void
 251 debug_qf_map_matching_symbols (struct objfile *objfile,
 252                                const char *name, domain_enum namespace,
 253                                int global,
 254                                int (*callback) (struct block *,
 255                                                 struct symbol *, void *),
 256                                void *data,
 257                                symbol_compare_ftype *match,
 258                                symbol_compare_ftype *ordered_compare)
 259 {
 260   const struct debug_sym_fns_data *debug_data =
 261     objfile_data (objfile, symfile_debug_objfile_data_key);
 262
 263   fprintf_filtered (gdb_stdlog,
 264                     "qf->map_matching_symbols (%s, \"%s\", %s, %d, %s, %s, %s, %s)\n",
 265                     objfile_debug_name (objfile), name,
 266                     domain_name (namespace), global,
 267                     host_address_to_string (callback),
 268                     host_address_to_string (data),
 269                     host_address_to_string (match),
 270                     host_address_to_string (ordered_compare));
 271
 272   debug_data->real_sf->qf->map_matching_symbols (objfile, name,
 273                                                  namespace, global,
 274                                                  callback, data,
 275                                                  match,
 276                                                  ordered_compare);
 277 }
 278
 279 static void
 280 debug_qf_expand_symtabs_matching
 281   (struct objfile *objfile,
 282    expand_symtabs_file_matcher_ftype *file_matcher,
 283    expand_symtabs_symbol_matcher_ftype *symbol_matcher,
 284    enum search_domain kind, void *data)
 285 {
 286   const struct debug_sym_fns_data *debug_data =
 287     objfile_data (objfile, symfile_debug_objfile_data_key);
 288
 289   fprintf_filtered (gdb_stdlog,
 290                     "qf->expand_symtabs_matching (%s, %s, %s, %s, %s)\n",
 291                     objfile_debug_name (objfile),
 292                     host_address_to_string (file_matcher),
 293                     host_address_to_string (symbol_matcher),
 294                     search_domain_name (kind),
 295                     host_address_to_string (data));
 296
 297   debug_data->real_sf->qf->expand_symtabs_matching (objfile,
 298                                                     file_matcher,
 299                                                     symbol_matcher,
 300                                                     kind, data);
 301 }
 302
 303 static struct compunit_symtab *
 304 debug_qf_find_pc_sect_compunit_symtab (struct objfile *objfile,
 305                                        struct bound_minimal_symbol msymbol,
 306                                        CORE_ADDR pc,
 307                                        struct obj_section *section,
 308                                        int warn_if_readin)
 309 {
 310   const struct debug_sym_fns_data *debug_data =
 311     objfile_data (objfile, symfile_debug_objfile_data_key);
 312   struct compunit_symtab *retval;
 313
 314   fprintf_filtered (gdb_stdlog,
 315                     "qf->find_pc_sect_compunit_symtab (%s, %s, %s, %s, %d)\n",
 316                     objfile_debug_name (objfile),
 317                     host_address_to_string (msymbol.minsym),
 318                     hex_string (pc),
 319                     host_address_to_string (section),
 320                     warn_if_readin);
 321
 322   retval
 323     = debug_data->real_sf->qf->find_pc_sect_compunit_symtab (objfile, msymbol,
 324                                                              pc, section,
 325                                                              warn_if_readin);
 326
 327   fprintf_filtered (gdb_stdlog,
 328                     "qf->find_pc_sect_compunit_symtab (...) = %s\n",
 329                     retval
 330                     ? debug_symtab_name (compunit_primary_filetab (retval))
 331                     : "NULL");
 332
 333   return retval;
 334 }
 335
 336 static void
 337 debug_qf_map_symbol_filenames (struct objfile *objfile,
 338                                symbol_filename_ftype *fun, void *data,
 339                                int need_fullname)
 340 {
 341   const struct debug_sym_fns_data *debug_data =
 342     objfile_data (objfile, symfile_debug_objfile_data_key);
 343   fprintf_filtered (gdb_stdlog,
 344                     "qf->map_symbol_filenames (%s, %s, %s, %d)\n",
 345                     objfile_debug_name (objfile),
 346                     host_address_to_string (fun),
 347                     host_address_to_string (data),
 348                     need_fullname);
 349
 350   debug_data->real_sf->qf->map_symbol_filenames (objfile, fun, data,
 351                                                  need_fullname);
 352 }
 353
 354 static const struct quick_symbol_functions debug_sym_quick_functions =
 355 {
 356   debug_qf_has_symbols,
 357   debug_qf_find_last_source_symtab,
 358   debug_qf_forget_cached_source_info,
 359   debug_qf_map_symtabs_matching_filename,
 360   debug_qf_lookup_symbol,
 361   debug_qf_print_stats,
 362   debug_qf_dump,
 363   debug_qf_relocate,
 364   debug_qf_expand_symtabs_for_function,
 365   debug_qf_expand_all_symtabs,
 366   debug_qf_expand_symtabs_with_fullname,
 367   debug_qf_map_matching_symbols,
 368   debug_qf_expand_symtabs_matching,
 369   debug_qf_find_pc_sect_compunit_symtab,
 370   debug_qf_map_symbol_filenames
 371 };
 372 \f
 373 /* Debugging version of struct sym_probe_fns.  */
 374
 375 static VEC (probe_p) *
 376 debug_sym_get_probes (struct objfile *objfile)
 377 {
 378   const struct debug_sym_fns_data *debug_data =
 379     objfile_data (objfile, symfile_debug_objfile_data_key);
 380   VEC (probe_p) *retval;
 381
 382   retval = debug_data->real_sf->sym_probe_fns->sym_get_probes (objfile);
 383
 384   fprintf_filtered (gdb_stdlog,
 385                     "probes->sym_get_probes (%s) = %s\n",
 386                     objfile_debug_name (objfile),
 387                     host_address_to_string (retval));
 388
 389   return retval;
 390 }
 391
 392 static const struct sym_probe_fns debug_sym_probe_fns =
 393 {
 394   debug_sym_get_probes,
 395 };
 396 \f
 397 /* Debugging version of struct sym_fns.  */
 398
 399 static void
 400 debug_sym_new_init (struct objfile *objfile)
 401 {
 402   const struct debug_sym_fns_data *debug_data =
 403     objfile_data (objfile, symfile_debug_objfile_data_key);
 404
 405   fprintf_filtered (gdb_stdlog, "sf->sym_new_init (%s)\n",
 406                     objfile_debug_name (objfile));
 407
 408   debug_data->real_sf->sym_new_init (objfile);
 409 }
 410
 411 static void
 412 debug_sym_init (struct objfile *objfile)
 413 {
 414   const struct debug_sym_fns_data *debug_data =
 415     objfile_data (objfile, symfile_debug_objfile_data_key);
 416
 417   fprintf_filtered (gdb_stdlog, "sf->sym_init (%s)\n",
 418                     objfile_debug_name (objfile));
 419
 420   debug_data->real_sf->sym_init (objfile);
 421 }
 422
 423 static void
 424 debug_sym_read (struct objfile *objfile, int symfile_flags)
 425 {
 426   const struct debug_sym_fns_data *debug_data =
 427     objfile_data (objfile, symfile_debug_objfile_data_key);
 428
 429   fprintf_filtered (gdb_stdlog, "sf->sym_read (%s, 0x%x)\n",
 430                     objfile_debug_name (objfile), symfile_flags);
 431
 432   debug_data->real_sf->sym_read (objfile, symfile_flags);
 433 }
 434
 435 static void
 436 debug_sym_read_psymbols (struct objfile *objfile)
 437 {
 438   const struct debug_sym_fns_data *debug_data =
 439     objfile_data (objfile, symfile_debug_objfile_data_key);
 440
 441   fprintf_filtered (gdb_stdlog, "sf->sym_read_psymbols (%s)\n",
 442                     objfile_debug_name (objfile));
 443
 444   debug_data->real_sf->sym_read_psymbols (objfile);
 445 }
 446
 447 static void
 448 debug_sym_finish (struct objfile *objfile)
 449 {
 450   const struct debug_sym_fns_data *debug_data =
 451     objfile_data (objfile, symfile_debug_objfile_data_key);
 452
 453   fprintf_filtered (gdb_stdlog, "sf->sym_finish (%s)\n",
 454                     objfile_debug_name (objfile));
 455
 456   debug_data->real_sf->sym_finish (objfile);
 457 }
 458
 459 static void
 460 debug_sym_offsets (struct objfile *objfile,
 461                    const struct section_addr_info *info)
 462 {
 463   const struct debug_sym_fns_data *debug_data =
 464     objfile_data (objfile, symfile_debug_objfile_data_key);
 465
 466   fprintf_filtered (gdb_stdlog, "sf->sym_offsets (%s, %s)\n",
 467                     objfile_debug_name (objfile),
 468                     host_address_to_string (info));
 469
 470   debug_data->real_sf->sym_offsets (objfile, info);
 471 }
 472
 473 static struct symfile_segment_data *
 474 debug_sym_segments (bfd *abfd)
 475 {
 476   /* This API function is annoying, it doesn't take a "this" pointer.
 477      Fortunately it is only used in one place where we (re-)lookup the
 478      sym_fns table to use.  Thus we will never be called.  */
 479   gdb_assert_not_reached ("debug_sym_segments called");
 480 }
 481
 482 static void
 483 debug_sym_read_linetable (struct objfile *objfile)
 484 {
 485   const struct debug_sym_fns_data *debug_data =
 486     objfile_data (objfile, symfile_debug_objfile_data_key);
 487
 488   fprintf_filtered (gdb_stdlog, "sf->sym_read_linetable (%s)\n",
 489                     objfile_debug_name (objfile));
 490
 491   debug_data->real_sf->sym_read_linetable (objfile);
 492 }
 493
 494 static bfd_byte *
 495 debug_sym_relocate (struct objfile *objfile, asection *sectp, bfd_byte *buf)
 496 {
 497   const struct debug_sym_fns_data *debug_data =
 498     objfile_data (objfile, symfile_debug_objfile_data_key);
 499   bfd_byte *retval;
 500
 501   retval = debug_data->real_sf->sym_relocate (objfile, sectp, buf);
 502
 503   fprintf_filtered (gdb_stdlog,
 504                     "sf->sym_relocate (%s, %s, %s) = %s\n",
 505                     objfile_debug_name (objfile),
 506                     host_address_to_string (sectp),
 507                     host_address_to_string (buf),
 508                     host_address_to_string (retval));
 509
 510   return retval;
 511 }
 512
 513 /* Template of debugging version of struct sym_fns.
 514    A copy is made, with sym_flavour updated, and a pointer to the real table
 515    installed in real_sf, and then a pointer to the copy is installed in the
 516    objfile.  */
 517
 518 static const struct sym_fns debug_sym_fns =
 519 {
 520   debug_sym_new_init,
 521   debug_sym_init,
 522   debug_sym_read,
 523   debug_sym_read_psymbols,
 524   debug_sym_finish,
 525   debug_sym_offsets,
 526   debug_sym_segments,
 527   debug_sym_read_linetable,
 528   debug_sym_relocate,
 529   &debug_sym_probe_fns,
 530   &debug_sym_quick_functions
 531 };
 532 \f
 533 /* Free the copy of sym_fns recorded in the registry.  */
 534
 535 static void
 536 symfile_debug_free_objfile (struct objfile *objfile, void *datum)
 537 {
 538   xfree (datum);
 539 }
 540
 541 /* Install the debugging versions of the symfile functions for OBJFILE.
 542    Do not call this if the debug versions are already installed.  */
 543
 544 static void
 545 install_symfile_debug_logging (struct objfile *objfile)
 546 {
 547   const struct sym_fns *real_sf;
 548   struct debug_sym_fns_data *debug_data;
 549
 550   /* The debug versions should not already be installed.  */
 551   gdb_assert (!symfile_debug_installed (objfile));
 552
 553   real_sf = objfile->sf;
 554
 555   /* Alas we have to preserve NULL entries in REAL_SF.  */
 556   debug_data = XCNEW (struct debug_sym_fns_data);
 557
 558 #define COPY_SF_PTR(from, to, name, func)       \
 559   do {                                          \
 560     if ((from)->name)                           \
 561       (to)->debug_sf.name = func;               \
 562   } while (0)
 563
 564   COPY_SF_PTR (real_sf, debug_data, sym_new_init, debug_sym_new_init);
 565   COPY_SF_PTR (real_sf, debug_data, sym_init, debug_sym_init);
 566   COPY_SF_PTR (real_sf, debug_data, sym_read, debug_sym_read);
 567   COPY_SF_PTR (real_sf, debug_data, sym_read_psymbols,
 568                debug_sym_read_psymbols);
 569   COPY_SF_PTR (real_sf, debug_data, sym_finish, debug_sym_finish);
 570   COPY_SF_PTR (real_sf, debug_data, sym_offsets, debug_sym_offsets);
 571   COPY_SF_PTR (real_sf, debug_data, sym_segments, debug_sym_segments);
 572   COPY_SF_PTR (real_sf, debug_data, sym_read_linetable,
 573                debug_sym_read_linetable);
 574   COPY_SF_PTR (real_sf, debug_data, sym_relocate, debug_sym_relocate);
 575   if (real_sf->sym_probe_fns)
 576     debug_data->debug_sf.sym_probe_fns = &debug_sym_probe_fns;
 577   debug_data->debug_sf.qf = &debug_sym_quick_functions;
 578
 579 #undef COPY_SF_PTR
 580
 581   debug_data->real_sf = real_sf;
 582   set_objfile_data (objfile, symfile_debug_objfile_data_key, debug_data);
 583   objfile->sf = &debug_data->debug_sf;
 584 }
 585
 586 /* Uninstall the debugging versions of the symfile functions for OBJFILE.
 587    Do not call this if the debug versions are not installed.  */
 588
 589 static void
 590 uninstall_symfile_debug_logging (struct objfile *objfile)
 591 {
 592   struct debug_sym_fns_data *debug_data;
 593
 594   /* The debug versions should be currently installed.  */
 595   gdb_assert (symfile_debug_installed (objfile));
 596
 597   debug_data = objfile_data (objfile, symfile_debug_objfile_data_key);
 598
 599   objfile->sf = debug_data->real_sf;
 600   xfree (debug_data);
 601   set_objfile_data (objfile, symfile_debug_objfile_data_key, NULL);
 602 }
 603
 604 /* Call this function to set OBJFILE->SF.
 605    Do not set OBJFILE->SF directly.  */
 606
 607 void
 608 objfile_set_sym_fns (struct objfile *objfile, const struct sym_fns *sf)
 609 {
 610   if (symfile_debug_installed (objfile))
 611     {
 612       gdb_assert (debug_symfile);
 613       /* Remove the current one, and reinstall a new one later.  */
 614       uninstall_symfile_debug_logging (objfile);
 615     }
 616
 617   /* Assume debug logging is disabled.  */
 618   objfile->sf = sf;
 619
 620   /* Turn debug logging on if enabled.  */
 621   if (debug_symfile)
 622     install_symfile_debug_logging (objfile);
 623 }
 624
 625 static void
 626 set_debug_symfile (char *args, int from_tty, struct cmd_list_element *c)
 627 {
 628   struct program_space *pspace;
 629   struct objfile *objfile;
 630
 631   ALL_PSPACES (pspace)
 632     ALL_PSPACE_OBJFILES (pspace, objfile)
 633     {
 634       if (debug_symfile)
 635         {
 636           if (!symfile_debug_installed (objfile))
 637             install_symfile_debug_logging (objfile);
 638         }
 639       else
 640         {
 641           if (symfile_debug_installed (objfile))
 642             uninstall_symfile_debug_logging (objfile);
 643         }
 644     }
 645 }
 646
 647 static void
 648 show_debug_symfile (struct ui_file *file, int from_tty,
 649                         struct cmd_list_element *c, const char *value)
 650 {
 651   fprintf_filtered (file, _("Symfile debugging is %s.\n"), value);
 652 }
 653
 654 initialize_file_ftype _initialize_symfile_debug;
 655
 656 void
 657 _initialize_symfile_debug (void)
 658 {
 659   symfile_debug_objfile_data_key
 660     = register_objfile_data_with_cleanup (NULL, symfile_debug_free_objfile);
 661
 662   add_setshow_boolean_cmd ("symfile", no_class, &debug_symfile, _("\
 663 Set debugging of the symfile functions."), _("\
 664 Show debugging of the symfile functions."), _("\
 665 When enabled, all calls to the symfile functions are logged."),
 666                            set_debug_symfile, show_debug_symfile,
 667                            &setdebuglist, &showdebuglist);
 668
 669   /* Note: We don't need a new-objfile observer because debug logging
 670      will be installed when objfile init'n calls objfile_set_sym_fns.  */
 671 }