gdb/symfile-debug.c

   1 /* Debug logging for the symbol file functions for the GNU debugger, GDB.
   2
   3    Copyright (C) 2013-2018 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     = ((const struct debug_sym_fns_data *)
  77        objfile_data (objfile, symfile_debug_objfile_data_key));
  78   int retval;
  79
  80   retval = debug_data->real_sf->qf->has_symbols (objfile);
  81
  82   fprintf_filtered (gdb_stdlog, "qf->has_symbols (%s) = %d\n",
  83                     objfile_debug_name (objfile), retval);
  84
  85   return retval;
  86 }
  87
  88 static struct symtab *
  89 debug_qf_find_last_source_symtab (struct objfile *objfile)
  90 {
  91   const struct debug_sym_fns_data *debug_data
  92     = ((const struct debug_sym_fns_data *)
  93        objfile_data (objfile, symfile_debug_objfile_data_key));
  94   struct symtab *retval;
  95
  96   fprintf_filtered (gdb_stdlog, "qf->find_last_source_symtab (%s)\n",
  97                     objfile_debug_name (objfile));
  98
  99   retval = debug_data->real_sf->qf->find_last_source_symtab (objfile);
 100
 101   fprintf_filtered (gdb_stdlog, "qf->find_last_source_symtab (...) = %s\n",
 102                     retval ? debug_symtab_name (retval) : "NULL");
 103
 104   return retval;
 105 }
 106
 107 static void
 108 debug_qf_forget_cached_source_info (struct objfile *objfile)
 109 {
 110   const struct debug_sym_fns_data *debug_data
 111     = ((const struct debug_sym_fns_data *)
 112        objfile_data (objfile, symfile_debug_objfile_data_key));
 113
 114   fprintf_filtered (gdb_stdlog, "qf->forget_cached_source_info (%s)\n",
 115                     objfile_debug_name (objfile));
 116
 117   debug_data->real_sf->qf->forget_cached_source_info (objfile);
 118 }
 119
 120 static bool
 121 debug_qf_map_symtabs_matching_filename
 122   (struct objfile *objfile, const char *name, const char *real_path,
 123    gdb::function_view<bool (symtab *)> callback)
 124 {
 125   const struct debug_sym_fns_data *debug_data
 126     = ((const struct debug_sym_fns_data *)
 127        objfile_data (objfile, symfile_debug_objfile_data_key));
 128
 129   fprintf_filtered (gdb_stdlog,
 130                     "qf->map_symtabs_matching_filename (%s, \"%s\", \"%s\", %s)\n",
 131                     objfile_debug_name (objfile), name,
 132                     real_path ? real_path : NULL,
 133                     host_address_to_string (&callback));
 134
 135   bool retval = (debug_data->real_sf->qf->map_symtabs_matching_filename
 136                  (objfile, name, real_path, callback));
 137
 138   fprintf_filtered (gdb_stdlog,
 139                     "qf->map_symtabs_matching_filename (...) = %d\n",
 140                     retval);
 141
 142   return retval;
 143 }
 144
 145 static struct compunit_symtab *
 146 debug_qf_lookup_symbol (struct objfile *objfile, int kind, const char *name,
 147                         domain_enum domain)
 148 {
 149   const struct debug_sym_fns_data *debug_data
 150     = ((const struct debug_sym_fns_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     = ((const struct debug_sym_fns_data *)
 175        objfile_data (objfile, symfile_debug_objfile_data_key));
 176
 177   fprintf_filtered (gdb_stdlog, "qf->print_stats (%s)\n",
 178                     objfile_debug_name (objfile));
 179
 180   debug_data->real_sf->qf->print_stats (objfile);
 181 }
 182
 183 static void
 184 debug_qf_dump (struct objfile *objfile)
 185 {
 186   const struct debug_sym_fns_data *debug_data
 187     = ((const struct debug_sym_fns_data *)
 188        objfile_data (objfile, symfile_debug_objfile_data_key));
 189
 190   fprintf_filtered (gdb_stdlog, "qf->dump (%s)\n",
 191                     objfile_debug_name (objfile));
 192
 193   debug_data->real_sf->qf->dump (objfile);
 194 }
 195
 196 static void
 197 debug_qf_relocate (struct objfile *objfile,
 198                    const struct section_offsets *new_offsets,
 199                    const struct section_offsets *delta)
 200 {
 201   const struct debug_sym_fns_data *debug_data
 202     = ((const struct debug_sym_fns_data *)
 203        objfile_data (objfile, symfile_debug_objfile_data_key));
 204
 205   fprintf_filtered (gdb_stdlog, "qf->relocate (%s, %s, %s)\n",
 206                     objfile_debug_name (objfile),
 207                     host_address_to_string (new_offsets),
 208                     host_address_to_string (delta));
 209
 210   debug_data->real_sf->qf->relocate (objfile, new_offsets, delta);
 211 }
 212
 213 static void
 214 debug_qf_expand_symtabs_for_function (struct objfile *objfile,
 215                                       const char *func_name)
 216 {
 217   const struct debug_sym_fns_data *debug_data
 218     = ((const struct debug_sym_fns_data *)
 219        objfile_data (objfile, symfile_debug_objfile_data_key));
 220
 221   fprintf_filtered (gdb_stdlog,
 222                     "qf->expand_symtabs_for_function (%s, \"%s\")\n",
 223                     objfile_debug_name (objfile), func_name);
 224
 225   debug_data->real_sf->qf->expand_symtabs_for_function (objfile, func_name);
 226 }
 227
 228 static void
 229 debug_qf_expand_all_symtabs (struct objfile *objfile)
 230 {
 231   const struct debug_sym_fns_data *debug_data
 232     = ((const struct debug_sym_fns_data *)
 233        objfile_data (objfile, symfile_debug_objfile_data_key));
 234
 235   fprintf_filtered (gdb_stdlog, "qf->expand_all_symtabs (%s)\n",
 236                     objfile_debug_name (objfile));
 237
 238   debug_data->real_sf->qf->expand_all_symtabs (objfile);
 239 }
 240
 241 static void
 242 debug_qf_expand_symtabs_with_fullname (struct objfile *objfile,
 243                                        const char *fullname)
 244 {
 245   const struct debug_sym_fns_data *debug_data
 246     = ((const struct debug_sym_fns_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                     objfile_debug_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 domain,
 259                                int global,
 260                                int (*callback) (struct block *,
 261                                                 struct symbol *, void *),
 262                                void *data,
 263                                symbol_name_match_type match,
 264                                symbol_compare_ftype *ordered_compare)
 265 {
 266   const struct debug_sym_fns_data *debug_data
 267     = ((const struct debug_sym_fns_data *)
 268        objfile_data (objfile, symfile_debug_objfile_data_key));
 269
 270   fprintf_filtered (gdb_stdlog,
 271                     "qf->map_matching_symbols (%s, \"%s\", %s, %d, %s, %s, %s, %s)\n",
 272                     objfile_debug_name (objfile), name,
 273                     domain_name (domain), global,
 274                     host_address_to_string (callback),
 275                     host_address_to_string (data),
 276                     plongest ((LONGEST) match),
 277                     host_address_to_string (ordered_compare));
 278
 279   debug_data->real_sf->qf->map_matching_symbols (objfile, name,
 280                                                  domain, global,
 281                                                  callback, data,
 282                                                  match,
 283                                                  ordered_compare);
 284 }
 285
 286 static void
 287 debug_qf_expand_symtabs_matching
 288   (struct objfile *objfile,
 289    gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
 290    const lookup_name_info &lookup_name,
 291    gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
 292    gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
 293    enum search_domain kind)
 294 {
 295   const struct debug_sym_fns_data *debug_data
 296     = ((const struct debug_sym_fns_data *)
 297        objfile_data (objfile, symfile_debug_objfile_data_key));
 298
 299   fprintf_filtered (gdb_stdlog,
 300                     "qf->expand_symtabs_matching (%s, %s, %s, %s, %s)\n",
 301                     objfile_debug_name (objfile),
 302                     host_address_to_string (&file_matcher),
 303                     host_address_to_string (&symbol_matcher),
 304                     host_address_to_string (&expansion_notify),
 305                     search_domain_name (kind));
 306
 307   debug_data->real_sf->qf->expand_symtabs_matching (objfile,
 308                                                     file_matcher,
 309                                                     lookup_name,
 310                                                     symbol_matcher,
 311                                                     expansion_notify,
 312                                                     kind);
 313 }
 314
 315 static struct compunit_symtab *
 316 debug_qf_find_pc_sect_compunit_symtab (struct objfile *objfile,
 317                                        struct bound_minimal_symbol msymbol,
 318                                        CORE_ADDR pc,
 319                                        struct obj_section *section,
 320                                        int warn_if_readin)
 321 {
 322   const struct debug_sym_fns_data *debug_data
 323     = ((const struct debug_sym_fns_data *)
 324        objfile_data (objfile, symfile_debug_objfile_data_key));
 325   struct compunit_symtab *retval;
 326
 327   fprintf_filtered (gdb_stdlog,
 328                     "qf->find_pc_sect_compunit_symtab (%s, %s, %s, %s, %d)\n",
 329                     objfile_debug_name (objfile),
 330                     host_address_to_string (msymbol.minsym),
 331                     hex_string (pc),
 332                     host_address_to_string (section),
 333                     warn_if_readin);
 334
 335   retval
 336     = debug_data->real_sf->qf->find_pc_sect_compunit_symtab (objfile, msymbol,
 337                                                              pc, section,
 338                                                              warn_if_readin);
 339
 340   fprintf_filtered (gdb_stdlog,
 341                     "qf->find_pc_sect_compunit_symtab (...) = %s\n",
 342                     retval
 343                     ? debug_symtab_name (compunit_primary_filetab (retval))
 344                     : "NULL");
 345
 346   return retval;
 347 }
 348
 349 static void
 350 debug_qf_map_symbol_filenames (struct objfile *objfile,
 351                                symbol_filename_ftype *fun, void *data,
 352                                int need_fullname)
 353 {
 354   const struct debug_sym_fns_data *debug_data
 355     = ((const struct debug_sym_fns_data *)
 356        objfile_data (objfile, symfile_debug_objfile_data_key));
 357   fprintf_filtered (gdb_stdlog,
 358                     "qf->map_symbol_filenames (%s, %s, %s, %d)\n",
 359                     objfile_debug_name (objfile),
 360                     host_address_to_string (fun),
 361                     host_address_to_string (data),
 362                     need_fullname);
 363
 364   debug_data->real_sf->qf->map_symbol_filenames (objfile, fun, data,
 365                                                  need_fullname);
 366 }
 367
 368 static struct compunit_symtab *
 369 debug_qf_find_compunit_symtab_by_address (struct objfile *objfile,
 370                                           CORE_ADDR address)
 371 {
 372   const struct debug_sym_fns_data *debug_data
 373     = ((const struct debug_sym_fns_data *)
 374        objfile_data (objfile, symfile_debug_objfile_data_key));
 375   fprintf_filtered (gdb_stdlog,
 376                     "qf->find_compunit_symtab_by_address (%s, %s)\n",
 377                     objfile_debug_name (objfile),
 378                     hex_string (address));
 379
 380   struct compunit_symtab *result = NULL;
 381   if (debug_data->real_sf->qf->map_symbol_filenames != NULL)
 382     result
 383       = debug_data->real_sf->qf->find_compunit_symtab_by_address (objfile,
 384                                                                   address);
 385
 386   fprintf_filtered (gdb_stdlog,
 387                     "qf->find_compunit_symtab_by_address (...) = %s\n",
 388                     result
 389                     ? debug_symtab_name (compunit_primary_filetab (result))
 390                     : "NULL");
 391
 392   return result;
 393 }
 394
 395 static const struct quick_symbol_functions debug_sym_quick_functions =
 396 {
 397   debug_qf_has_symbols,
 398   debug_qf_find_last_source_symtab,
 399   debug_qf_forget_cached_source_info,
 400   debug_qf_map_symtabs_matching_filename,
 401   debug_qf_lookup_symbol,
 402   debug_qf_print_stats,
 403   debug_qf_dump,
 404   debug_qf_relocate,
 405   debug_qf_expand_symtabs_for_function,
 406   debug_qf_expand_all_symtabs,
 407   debug_qf_expand_symtabs_with_fullname,
 408   debug_qf_map_matching_symbols,
 409   debug_qf_expand_symtabs_matching,
 410   debug_qf_find_pc_sect_compunit_symtab,
 411   debug_qf_find_compunit_symtab_by_address,
 412   debug_qf_map_symbol_filenames
 413 };
 414 \f
 415 /* Debugging version of struct sym_probe_fns.  */
 416
 417 static const std::vector<probe *> &
 418 debug_sym_get_probes (struct objfile *objfile)
 419 {
 420   const struct debug_sym_fns_data *debug_data
 421     = ((const struct debug_sym_fns_data *)
 422        objfile_data (objfile, symfile_debug_objfile_data_key));
 423
 424   const std::vector<probe *> &retval
 425     = debug_data->real_sf->sym_probe_fns->sym_get_probes (objfile);
 426
 427   fprintf_filtered (gdb_stdlog,
 428                     "probes->sym_get_probes (%s) = %s\n",
 429                     objfile_debug_name (objfile),
 430                     host_address_to_string (retval.data ()));
 431
 432   return retval;
 433 }
 434
 435 static const struct sym_probe_fns debug_sym_probe_fns =
 436 {
 437   debug_sym_get_probes,
 438 };
 439 \f
 440 /* Debugging version of struct sym_fns.  */
 441
 442 static void
 443 debug_sym_new_init (struct objfile *objfile)
 444 {
 445   const struct debug_sym_fns_data *debug_data
 446     = ((const struct debug_sym_fns_data *)
 447        objfile_data (objfile, symfile_debug_objfile_data_key));
 448
 449   fprintf_filtered (gdb_stdlog, "sf->sym_new_init (%s)\n",
 450                     objfile_debug_name (objfile));
 451
 452   debug_data->real_sf->sym_new_init (objfile);
 453 }
 454
 455 static void
 456 debug_sym_init (struct objfile *objfile)
 457 {
 458   const struct debug_sym_fns_data *debug_data
 459     = ((const struct debug_sym_fns_data *)
 460        objfile_data (objfile, symfile_debug_objfile_data_key));
 461
 462   fprintf_filtered (gdb_stdlog, "sf->sym_init (%s)\n",
 463                     objfile_debug_name (objfile));
 464
 465   debug_data->real_sf->sym_init (objfile);
 466 }
 467
 468 static void
 469 debug_sym_read (struct objfile *objfile, symfile_add_flags symfile_flags)
 470 {
 471   const struct debug_sym_fns_data *debug_data
 472     = ((const struct debug_sym_fns_data *)
 473        objfile_data (objfile, symfile_debug_objfile_data_key));
 474
 475   fprintf_filtered (gdb_stdlog, "sf->sym_read (%s, 0x%x)\n",
 476                     objfile_debug_name (objfile), (unsigned) symfile_flags);
 477
 478   debug_data->real_sf->sym_read (objfile, symfile_flags);
 479 }
 480
 481 static void
 482 debug_sym_read_psymbols (struct objfile *objfile)
 483 {
 484   const struct debug_sym_fns_data *debug_data
 485     = ((const struct debug_sym_fns_data *)
 486        objfile_data (objfile, symfile_debug_objfile_data_key));
 487
 488   fprintf_filtered (gdb_stdlog, "sf->sym_read_psymbols (%s)\n",
 489                     objfile_debug_name (objfile));
 490
 491   debug_data->real_sf->sym_read_psymbols (objfile);
 492 }
 493
 494 static void
 495 debug_sym_finish (struct objfile *objfile)
 496 {
 497   const struct debug_sym_fns_data *debug_data
 498     = ((const struct debug_sym_fns_data *)
 499        objfile_data (objfile, symfile_debug_objfile_data_key));
 500
 501   fprintf_filtered (gdb_stdlog, "sf->sym_finish (%s)\n",
 502                     objfile_debug_name (objfile));
 503
 504   debug_data->real_sf->sym_finish (objfile);
 505 }
 506
 507 static void
 508 debug_sym_offsets (struct objfile *objfile,
 509                    const section_addr_info &info)
 510 {
 511   const struct debug_sym_fns_data *debug_data
 512     = ((const struct debug_sym_fns_data *)
 513        objfile_data (objfile, symfile_debug_objfile_data_key));
 514
 515   fprintf_filtered (gdb_stdlog, "sf->sym_offsets (%s, %s)\n",
 516                     objfile_debug_name (objfile),
 517                     host_address_to_string (&info));
 518
 519   debug_data->real_sf->sym_offsets (objfile, info);
 520 }
 521
 522 static struct symfile_segment_data *
 523 debug_sym_segments (bfd *abfd)
 524 {
 525   /* This API function is annoying, it doesn't take a "this" pointer.
 526      Fortunately it is only used in one place where we (re-)lookup the
 527      sym_fns table to use.  Thus we will never be called.  */
 528   gdb_assert_not_reached ("debug_sym_segments called");
 529 }
 530
 531 static void
 532 debug_sym_read_linetable (struct objfile *objfile)
 533 {
 534   const struct debug_sym_fns_data *debug_data
 535     = ((const struct debug_sym_fns_data *)
 536        objfile_data (objfile, symfile_debug_objfile_data_key));
 537
 538   fprintf_filtered (gdb_stdlog, "sf->sym_read_linetable (%s)\n",
 539                     objfile_debug_name (objfile));
 540
 541   debug_data->real_sf->sym_read_linetable (objfile);
 542 }
 543
 544 static bfd_byte *
 545 debug_sym_relocate (struct objfile *objfile, asection *sectp, bfd_byte *buf)
 546 {
 547   const struct debug_sym_fns_data *debug_data
 548     = ((const struct debug_sym_fns_data *)
 549        objfile_data (objfile, symfile_debug_objfile_data_key));
 550   bfd_byte *retval;
 551
 552   retval = debug_data->real_sf->sym_relocate (objfile, sectp, buf);
 553
 554   fprintf_filtered (gdb_stdlog,
 555                     "sf->sym_relocate (%s, %s, %s) = %s\n",
 556                     objfile_debug_name (objfile),
 557                     host_address_to_string (sectp),
 558                     host_address_to_string (buf),
 559                     host_address_to_string (retval));
 560
 561   return retval;
 562 }
 563
 564 /* Template of debugging version of struct sym_fns.
 565    A copy is made, with sym_flavour updated, and a pointer to the real table
 566    installed in real_sf, and then a pointer to the copy is installed in the
 567    objfile.  */
 568
 569 static const struct sym_fns debug_sym_fns =
 570 {
 571   debug_sym_new_init,
 572   debug_sym_init,
 573   debug_sym_read,
 574   debug_sym_read_psymbols,
 575   debug_sym_finish,
 576   debug_sym_offsets,
 577   debug_sym_segments,
 578   debug_sym_read_linetable,
 579   debug_sym_relocate,
 580   &debug_sym_probe_fns,
 581   &debug_sym_quick_functions
 582 };
 583 \f
 584 /* Free the copy of sym_fns recorded in the registry.  */
 585
 586 static void
 587 symfile_debug_free_objfile (struct objfile *objfile, void *datum)
 588 {
 589   xfree (datum);
 590 }
 591
 592 /* Install the debugging versions of the symfile functions for OBJFILE.
 593    Do not call this if the debug versions are already installed.  */
 594
 595 static void
 596 install_symfile_debug_logging (struct objfile *objfile)
 597 {
 598   const struct sym_fns *real_sf;
 599   struct debug_sym_fns_data *debug_data;
 600
 601   /* The debug versions should not already be installed.  */
 602   gdb_assert (!symfile_debug_installed (objfile));
 603
 604   real_sf = objfile->sf;
 605
 606   /* Alas we have to preserve NULL entries in REAL_SF.  */
 607   debug_data = XCNEW (struct debug_sym_fns_data);
 608
 609 #define COPY_SF_PTR(from, to, name, func)       \
 610   do {                                          \
 611     if ((from)->name)                           \
 612       (to)->debug_sf.name = func;               \
 613   } while (0)
 614
 615   COPY_SF_PTR (real_sf, debug_data, sym_new_init, debug_sym_new_init);
 616   COPY_SF_PTR (real_sf, debug_data, sym_init, debug_sym_init);
 617   COPY_SF_PTR (real_sf, debug_data, sym_read, debug_sym_read);
 618   COPY_SF_PTR (real_sf, debug_data, sym_read_psymbols,
 619                debug_sym_read_psymbols);
 620   COPY_SF_PTR (real_sf, debug_data, sym_finish, debug_sym_finish);
 621   COPY_SF_PTR (real_sf, debug_data, sym_offsets, debug_sym_offsets);
 622   COPY_SF_PTR (real_sf, debug_data, sym_segments, debug_sym_segments);
 623   COPY_SF_PTR (real_sf, debug_data, sym_read_linetable,
 624                debug_sym_read_linetable);
 625   COPY_SF_PTR (real_sf, debug_data, sym_relocate, debug_sym_relocate);
 626   if (real_sf->sym_probe_fns)
 627     debug_data->debug_sf.sym_probe_fns = &debug_sym_probe_fns;
 628   debug_data->debug_sf.qf = &debug_sym_quick_functions;
 629
 630 #undef COPY_SF_PTR
 631
 632   debug_data->real_sf = real_sf;
 633   set_objfile_data (objfile, symfile_debug_objfile_data_key, debug_data);
 634   objfile->sf = &debug_data->debug_sf;
 635 }
 636
 637 /* Uninstall the debugging versions of the symfile functions for OBJFILE.
 638    Do not call this if the debug versions are not installed.  */
 639
 640 static void
 641 uninstall_symfile_debug_logging (struct objfile *objfile)
 642 {
 643   struct debug_sym_fns_data *debug_data;
 644
 645   /* The debug versions should be currently installed.  */
 646   gdb_assert (symfile_debug_installed (objfile));
 647
 648   debug_data = ((struct debug_sym_fns_data *)
 649                 objfile_data (objfile, symfile_debug_objfile_data_key));
 650
 651   objfile->sf = debug_data->real_sf;
 652   xfree (debug_data);
 653   set_objfile_data (objfile, symfile_debug_objfile_data_key, NULL);
 654 }
 655
 656 /* Call this function to set OBJFILE->SF.
 657    Do not set OBJFILE->SF directly.  */
 658
 659 void
 660 objfile_set_sym_fns (struct objfile *objfile, const struct sym_fns *sf)
 661 {
 662   if (symfile_debug_installed (objfile))
 663     {
 664       gdb_assert (debug_symfile);
 665       /* Remove the current one, and reinstall a new one later.  */
 666       uninstall_symfile_debug_logging (objfile);
 667     }
 668
 669   /* Assume debug logging is disabled.  */
 670   objfile->sf = sf;
 671
 672   /* Turn debug logging on if enabled.  */
 673   if (debug_symfile)
 674     install_symfile_debug_logging (objfile);
 675 }
 676
 677 static void
 678 set_debug_symfile (const char *args, int from_tty, struct cmd_list_element *c)
 679 {
 680   struct program_space *pspace;
 681   struct objfile *objfile;
 682
 683   ALL_PSPACES (pspace)
 684     ALL_PSPACE_OBJFILES (pspace, objfile)
 685     {
 686       if (debug_symfile)
 687         {
 688           if (!symfile_debug_installed (objfile))
 689             install_symfile_debug_logging (objfile);
 690         }
 691       else
 692         {
 693           if (symfile_debug_installed (objfile))
 694             uninstall_symfile_debug_logging (objfile);
 695         }
 696     }
 697 }
 698
 699 static void
 700 show_debug_symfile (struct ui_file *file, int from_tty,
 701                         struct cmd_list_element *c, const char *value)
 702 {
 703   fprintf_filtered (file, _("Symfile debugging is %s.\n"), value);
 704 }
 705
 706 void
 707 _initialize_symfile_debug (void)
 708 {
 709   symfile_debug_objfile_data_key
 710     = register_objfile_data_with_cleanup (NULL, symfile_debug_free_objfile);
 711
 712   add_setshow_boolean_cmd ("symfile", no_class, &debug_symfile, _("\
 713 Set debugging of the symfile functions."), _("\
 714 Show debugging of the symfile functions."), _("\
 715 When enabled, all calls to the symfile functions are logged."),
 716                            set_debug_symfile, show_debug_symfile,
 717                            &setdebuglist, &showdebuglist);
 718
 719   /* Note: We don't need a new-objfile observer because debug logging
 720      will be installed when objfile init'n calls objfile_set_sym_fns.  */
 721 }