gold/incremental-dump.cc

   1 // incremental.cc -- incremental linking test/debug tool
   2
   3 // Copyright 2009, 2010 Free Software Foundation, Inc.
   4 // Written by Rafael Avila de Espindola <rafael.espindola@gmail.com>
   5
   6 // This file is part of gold.
   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, write to the Free Software
  20 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  21 // MA 02110-1301, USA.
  22
  23
  24 // This file is a (still incomplete) test/debug tool that should display
  25 // all information available in the incremental linking sections in a
  26 // format that is easy to read.
  27 // Once the format is a bit more stable, this should probably be moved to
  28 // readelf. Because of that, the use of gold's data structures and functions
  29 // is just a short term convenience and not a design decision.
  30
  31 #include "gold.h"
  32
  33 #include <stdio.h>
  34 #include <errno.h>
  35 #include <time.h>
  36
  37 #include "incremental.h"
  38
  39 namespace gold
  40 {
  41   class Output_file;
  42 }
  43
  44 using namespace gold;
  45
  46 template<int size, bool big_endian>
  47 static typename Incremental_inputs_reader<size, big_endian>::
  48     Incremental_input_entry_reader
  49 find_input_containing_global(
  50     Incremental_inputs_reader<size, big_endian>& incremental_inputs,
  51     unsigned int offset,
  52     unsigned int* symndx)
  53 {
  54   typedef Incremental_inputs_reader<size, big_endian> Inputs_reader;
  55   for (unsigned int i = 0; i < incremental_inputs.input_file_count(); ++i)
  56     {
  57       typename Inputs_reader::Incremental_input_entry_reader input_file =
  58           incremental_inputs.input_file(i);
  59       if (input_file.type() != INCREMENTAL_INPUT_OBJECT
  60           && input_file.type() != INCREMENTAL_INPUT_ARCHIVE_MEMBER)
  61         continue;
  62       unsigned int nsyms = input_file.get_global_symbol_count();
  63       if (offset >= input_file.get_symbol_offset(0)
  64           && offset < input_file.get_symbol_offset(nsyms))
  65         {
  66           *symndx = (offset - input_file.get_symbol_offset(0)) / 20;
  67           return input_file;
  68         }
  69     }
  70   gold_unreachable();
  71 }
  72
  73 template<int size, bool big_endian>
  74 static void
  75 dump_incremental_inputs(const char* argv0, const char* filename,
  76                         Sized_incremental_binary<size, big_endian>* inc)
  77 {
  78   typedef Incremental_binary::Location Location;
  79   typedef Incremental_binary::View View;
  80   typedef Incremental_inputs_reader<size, big_endian> Inputs_reader;
  81   typedef typename Inputs_reader::Incremental_input_entry_reader Entry_reader;
  82
  83   if (!inc->has_incremental_info())
  84     {
  85       fprintf(stderr, "%s: %s: no .gnu_incremental_inputs section\n", argv0,
  86               filename);
  87       exit(1);
  88     }
  89
  90   // Create a reader object for the .gnu_incremental_inputs section.
  91
  92   Incremental_inputs_reader<size, big_endian>
  93       incremental_inputs(inc->inputs_reader());
  94
  95   if (incremental_inputs.version() != 1)
  96     {
  97       fprintf(stderr, "%s: %s: unknown incremental version %d\n", argv0,
  98               filename, incremental_inputs.version());
  99       exit(1);
 100     }
 101
 102   const char* command_line = incremental_inputs.command_line();
 103   if (command_line == NULL)
 104     {
 105       fprintf(stderr,
 106               "%s: %s: failed to get link command line\n",
 107               argv0, filename);
 108       exit(1);
 109     }
 110   printf("Link command line: %s\n", command_line);
 111
 112   printf("\nInput files:\n");
 113   for (unsigned int i = 0; i < incremental_inputs.input_file_count(); ++i)
 114     {
 115       Entry_reader input_file = incremental_inputs.input_file(i);
 116
 117       const char* objname = input_file.filename();
 118       if (objname == NULL)
 119         {
 120           fprintf(stderr,"%s: %s: failed to get file name for object %u\n",
 121                   argv0, filename, i);
 122           exit(1);
 123         }
 124       printf("[%d] %s\n", i, objname);
 125
 126       Timespec mtime = input_file.get_mtime();
 127       printf("    Timestamp: %llu.%09d  %s",
 128              static_cast<unsigned long long>(mtime.seconds),
 129              mtime.nanoseconds,
 130              ctime(&mtime.seconds));
 131
 132       printf("    Serial Number: %d\n", input_file.arg_serial());
 133       printf("    In System Directory: %s\n",
 134              input_file.is_in_system_directory() ? "true" : "false");
 135
 136       Incremental_input_type input_type = input_file.type();
 137       printf("    Type: ");
 138       switch (input_type)
 139         {
 140         case INCREMENTAL_INPUT_OBJECT:
 141         case INCREMENTAL_INPUT_ARCHIVE_MEMBER:
 142           printf("%s\n", (input_type == INCREMENTAL_INPUT_OBJECT
 143                           ? "Object" : "Archive member"));
 144           printf("    Input section count: %d\n",
 145                  input_file.get_input_section_count());
 146           printf("    Global symbol count: %d\n",
 147                  input_file.get_global_symbol_count());
 148           printf("    Local symbol offset: %d\n",
 149                  input_file.get_local_symbol_offset());
 150           printf("    Local symbol count: %d\n",
 151                  input_file.get_local_symbol_count());
 152           printf("    First dynamic reloc: %d\n",
 153                  input_file.get_first_dyn_reloc());
 154           printf("    Dynamic reloc count: %d\n",
 155                  input_file.get_dyn_reloc_count());
 156           printf("    COMDAT group count: %d\n",
 157                  input_file.get_comdat_group_count());
 158           break;
 159         case INCREMENTAL_INPUT_ARCHIVE:
 160           printf("Archive\n");
 161           printf("    Member count: %d\n", input_file.get_member_count());
 162           printf("    Unused symbol count: %d\n",
 163                  input_file.get_unused_symbol_count());
 164           break;
 165         case INCREMENTAL_INPUT_SHARED_LIBRARY:
 166           printf("Shared library\n");
 167           printf("    As needed: %s\n",
 168                  input_file.as_needed() ? "true" : "false");
 169           printf("    soname: %s\n",
 170                  input_file.get_soname());
 171           printf("    Symbol count: %d\n",
 172                  input_file.get_global_symbol_count());
 173           break;
 174         case INCREMENTAL_INPUT_SCRIPT:
 175           printf("Linker script\n");
 176           printf("    Object count: %d\n", input_file.get_object_count());
 177           break;
 178         default:
 179           fprintf(stderr, "%s: invalid file type for object %u: %d\n",
 180                   argv0, i, input_type);
 181           exit(1);
 182         }
 183     }
 184
 185   printf("\nInput sections:\n");
 186   for (unsigned int i = 0; i < incremental_inputs.input_file_count(); ++i)
 187     {
 188       Entry_reader input_file(incremental_inputs.input_file(i));
 189
 190       if (input_file.type() != INCREMENTAL_INPUT_OBJECT
 191           && input_file.type() != INCREMENTAL_INPUT_ARCHIVE_MEMBER)
 192         continue;
 193
 194       const char* objname = input_file.filename();
 195       if (objname == NULL)
 196         {
 197           fprintf(stderr,"%s: %s: failed to get file name for object %u\n",
 198                   argv0, filename, i);
 199           exit(1);
 200         }
 201
 202       printf("[%d] %s\n", i, objname);
 203
 204       printf("    %3s  %6s  %8s  %8s  %s\n",
 205              "n", "outndx", "offset", "size", "name");
 206       unsigned int nsections = input_file.get_input_section_count();
 207       for (unsigned int shndx = 0; shndx < nsections; ++shndx)
 208         {
 209           typename Entry_reader::Input_section_info info(
 210               input_file.get_input_section(shndx));
 211           printf("    %3d  %6d  %8lld  %8lld  %s\n", shndx + 1,
 212                  info.output_shndx,
 213                  static_cast<long long>(info.sh_offset),
 214                  static_cast<long long>(info.sh_size),
 215                  info.name);
 216         }
 217
 218       unsigned int ncomdat = input_file.get_comdat_group_count();
 219       for (unsigned int i = 0; i < ncomdat; ++i)
 220         printf("    Comdat group: %s\n",
 221                input_file.get_comdat_group_signature(i));
 222     }
 223
 224   // Get a view of the .symtab section.
 225
 226   elfcpp::Elf_file<size, big_endian, Incremental_binary> elf_file(inc);
 227
 228   unsigned int symtab_shndx = elf_file.find_section_by_type(elfcpp::SHT_SYMTAB);
 229   if (symtab_shndx == elfcpp::SHN_UNDEF)  // Not found.
 230     {
 231       fprintf(stderr, "%s: %s: no symbol table section\n", argv0, filename);
 232       exit(1);
 233     }
 234   Location symtab_location(elf_file.section_contents(symtab_shndx));
 235   View symtab_view(inc->view(symtab_location));
 236
 237   // Get a view of the .strtab section.
 238
 239   unsigned int strtab_shndx = elf_file.section_link(symtab_shndx);
 240   if (strtab_shndx == elfcpp::SHN_UNDEF
 241       || strtab_shndx > elf_file.shnum()
 242       || elf_file.section_type(strtab_shndx) != elfcpp::SHT_STRTAB)
 243     {
 244       fprintf(stderr, "%s: %s: no string table section\n", argv0, filename);
 245       exit(1);
 246     }
 247   Location strtab_location(elf_file.section_contents(strtab_shndx));
 248   View strtab_view(inc->view(strtab_location));
 249   elfcpp::Elf_strtab strtab(strtab_view.data(), strtab_location.data_size);
 250
 251   // The .gnu_incremental_symtab section contains entries that parallel
 252   // the global symbols of the main symbol table.  The sh_info field
 253   // of the main symbol table's section header tells us how many global
 254   // symbols there are, but that count does not include any global
 255   // symbols that were forced local during the link.  Therefore, we
 256   // use the size of the .gnu_incremental_symtab section to deduce
 257   // the number of global symbols + forced-local symbols there are
 258   // in the symbol table.
 259   Incremental_symtab_reader<big_endian> isymtab(inc->symtab_reader());
 260   Incremental_relocs_reader<size, big_endian> irelocs(inc->relocs_reader());
 261   unsigned int sym_size = elfcpp::Elf_sizes<size>::sym_size;
 262   unsigned int nsyms = symtab_location.data_size / sym_size;
 263   unsigned int nglobals = isymtab.symbol_count();
 264   unsigned int first_global = nsyms - nglobals;
 265   unsigned const char* sym_p;
 266
 267   printf("\nGlobal symbols per input file:\n");
 268   for (unsigned int i = 0; i < incremental_inputs.input_file_count(); ++i)
 269     {
 270       Entry_reader input_file(incremental_inputs.input_file(i));
 271
 272       if (input_file.type() != INCREMENTAL_INPUT_OBJECT
 273           && input_file.type() != INCREMENTAL_INPUT_ARCHIVE_MEMBER
 274           && input_file.type() != INCREMENTAL_INPUT_SHARED_LIBRARY)
 275         continue;
 276
 277       const char* objname = input_file.filename();
 278       if (objname == NULL)
 279         {
 280           fprintf(stderr,"%s: %s: failed to get file name for object %u\n",
 281                   argv0, filename, i);
 282           exit(1);
 283         }
 284
 285       printf("[%d] %s\n", i, objname);
 286
 287       unsigned int nsyms = input_file.get_global_symbol_count();
 288       if (nsyms > 0)
 289         printf("    %6s  %6s  %8s  %8s  %8s  %8s\n",
 290                "outndx", "shndx", "offset", "chain", "#relocs", "rbase");
 291       if (input_file.type() == INCREMENTAL_INPUT_SHARED_LIBRARY)
 292         {
 293           for (unsigned int symndx = 0; symndx < nsyms; ++symndx)
 294             {
 295               bool is_def;
 296               bool is_copy;
 297               unsigned int output_symndx =
 298                   input_file.get_output_symbol_index(symndx, &is_def, &is_copy);
 299               sym_p = symtab_view.data() + output_symndx * sym_size;
 300               elfcpp::Sym<size, big_endian> sym(sym_p);
 301               const char* symname;
 302               if (!strtab.get_c_string(sym.get_st_name(), &symname))
 303                 symname = "<unknown>";
 304               printf("    %6d  %6s  %8s  %8s  %8s  %8s  %-5s  %s\n",
 305                      output_symndx,
 306                      "", "", "", "", "",
 307                      is_copy ? "COPY" : (is_def ? "DEF" : "UNDEF"),
 308                      symname);
 309             }
 310         }
 311       else
 312         {
 313           for (unsigned int symndx = 0; symndx < nsyms; ++symndx)
 314             {
 315               Incremental_global_symbol_reader<big_endian> info(
 316                   input_file.get_global_symbol_reader(symndx));
 317               unsigned int output_symndx = info.output_symndx();
 318               sym_p = symtab_view.data() + output_symndx * sym_size;
 319               elfcpp::Sym<size, big_endian> sym(sym_p);
 320               const char* symname;
 321               if (!strtab.get_c_string(sym.get_st_name(), &symname))
 322                 symname = "<unknown>";
 323               printf("    %6d  %6d  %8d  %8d  %8d  %8d  %-5s  %s\n",
 324                      output_symndx,
 325                      info.shndx(),
 326                      input_file.get_symbol_offset(symndx),
 327                      info.next_offset(),
 328                      info.reloc_count(),
 329                      info.reloc_offset(),
 330                      info.shndx() != elfcpp::SHN_UNDEF ? "DEF" : "UNDEF",
 331                      symname);
 332             }
 333         }
 334     }
 335
 336   sym_p = symtab_view.data() + first_global * sym_size;
 337   printf("\nGlobal symbol table:\n");
 338   for (unsigned int i = 0; i < nglobals; i++)
 339     {
 340       elfcpp::Sym<size, big_endian> sym(sym_p);
 341       const char* symname;
 342       if (!strtab.get_c_string(sym.get_st_name(), &symname))
 343         symname = "<unknown>";
 344       printf("[%d] %s\n", first_global + i, symname);
 345       unsigned int offset = isymtab.get_list_head(i);
 346       while (offset > 0)
 347         {
 348           unsigned int sym_ndx;
 349           Entry_reader input_file =
 350               find_input_containing_global<size, big_endian>(incremental_inputs,
 351                                                              offset, &sym_ndx);
 352           Incremental_global_symbol_reader<big_endian> sym_info(
 353               input_file.get_global_symbol_reader(sym_ndx));
 354           printf("    %s (first reloc: %d, reloc count: %d)",
 355                  input_file.filename(), sym_info.reloc_offset(),
 356                  sym_info.reloc_count());
 357           if (sym_info.output_symndx() != first_global + i)
 358             printf(" ** wrong output symndx (%d) **", sym_info.output_symndx());
 359           printf("\n");
 360           // Dump the relocations from this input file for this symbol.
 361           unsigned int r_off = sym_info.reloc_offset();
 362           for (unsigned int j = 0; j < sym_info.reloc_count(); j++)
 363             {
 364               printf("      %4d  relocation type %3d  shndx %2d"
 365                      "  offset %016llx  addend %016llx  %s\n",
 366                      r_off,
 367                      irelocs.get_r_type(r_off),
 368                      irelocs.get_r_shndx(r_off),
 369                      static_cast<long long>(irelocs.get_r_offset(r_off)),
 370                      static_cast<long long>(irelocs.get_r_addend(r_off)),
 371                      symname);
 372               r_off += irelocs.reloc_size;
 373             }
 374           offset = sym_info.next_offset();
 375         }
 376       sym_p += sym_size;
 377     }
 378
 379   Incremental_got_plt_reader<big_endian> igot_plt(inc->got_plt_reader());
 380   unsigned int ngot = igot_plt.get_got_entry_count();
 381   unsigned int nplt = igot_plt.get_plt_entry_count();
 382
 383   printf("\nGOT entries:\n");
 384   for (unsigned int i = 0; i < ngot; ++i)
 385     {
 386       unsigned int got_type = igot_plt.get_got_type(i);
 387       unsigned int got_symndx = igot_plt.get_got_symndx(i);
 388       unsigned int got_input_index = igot_plt.get_got_input_index(i);
 389       printf("[%d] type %02x, ", i, got_type & 0x7f);
 390       if ((got_type & 0x7f) == 0x7f)
 391         printf("reserved");
 392       else if (got_type & 0x80)
 393         {
 394           Entry_reader input_file =
 395               incremental_inputs.input_file(got_input_index);
 396           const char* objname = input_file.filename();
 397           printf("local: %s (%d)", objname, got_symndx);
 398         }
 399       else
 400         {
 401           sym_p = symtab_view.data() + got_symndx * sym_size;
 402           elfcpp::Sym<size, big_endian> sym(sym_p);
 403           const char* symname;
 404           if (!strtab.get_c_string(sym.get_st_name(), &symname))
 405             symname = "<unknown>";
 406           printf("global %s (%d)", symname, got_symndx);
 407         }
 408       printf("\n");
 409     }
 410
 411   printf("\nPLT entries:\n");
 412   for (unsigned int i = 0; i < nplt; ++i)
 413     {
 414       unsigned int plt_desc = igot_plt.get_plt_desc(i);
 415       printf("[%d] ", i);
 416       sym_p = symtab_view.data() + plt_desc * sym_size;
 417       elfcpp::Sym<size, big_endian> sym(sym_p);
 418       const char* symname;
 419       if (!strtab.get_c_string(sym.get_st_name(), &symname))
 420         symname = "<unknown>";
 421       printf("%s (%d)\n", symname, plt_desc);
 422     }
 423
 424   printf("\nUnused archive symbols:\n");
 425   for (unsigned int i = 0; i < incremental_inputs.input_file_count(); ++i)
 426     {
 427       Entry_reader input_file(incremental_inputs.input_file(i));
 428
 429       if (input_file.type() != INCREMENTAL_INPUT_ARCHIVE)
 430         continue;
 431
 432       const char* objname = input_file.filename();
 433       if (objname == NULL)
 434         {
 435           fprintf(stderr,"%s: %s: failed to get file name for object %u\n",
 436                   argv0, filename, i);
 437           exit(1);
 438         }
 439
 440       printf("[%d] %s\n", i, objname);
 441       unsigned int nsyms = input_file.get_unused_symbol_count();
 442       for (unsigned int symndx = 0; symndx < nsyms; ++symndx)
 443         printf("    %s\n", input_file.get_unused_symbol(symndx));
 444     }
 445
 446 }
 447
 448 int
 449 main(int argc, char** argv)
 450 {
 451   if (argc != 2)
 452     {
 453       fprintf(stderr, "Usage: %s <file>\n", argv[0]);
 454       return 1;
 455     }
 456   const char* filename = argv[1];
 457
 458   Output_file* file = new Output_file(filename);
 459
 460   bool t = file->open_base_file(NULL, false);
 461   if (!t)
 462     {
 463       fprintf(stderr, "%s: open_base_file(%s): %s\n", argv[0], filename,
 464               strerror(errno));
 465       return 1;
 466     }
 467
 468   Incremental_binary* inc = open_incremental_binary(file);
 469
 470   if (inc == NULL)
 471     {
 472       fprintf(stderr, "%s: open_incremental_binary(%s): %s\n", argv[0],
 473               filename, strerror(errno));
 474       return 1;
 475     }
 476
 477   switch (parameters->size_and_endianness())
 478     {
 479 #ifdef HAVE_TARGET_32_LITTLE
 480     case Parameters::TARGET_32_LITTLE:
 481       dump_incremental_inputs<32, false>(
 482           argv[0], filename,
 483           static_cast<Sized_incremental_binary<32, false>*>(inc));
 484       break;
 485 #endif
 486 #ifdef HAVE_TARGET_32_BIG
 487     case Parameters::TARGET_32_BIG:
 488       dump_incremental_inputs<32, true>(
 489           argv[0], filename,
 490           static_cast<Sized_incremental_binary<32, true>*>(inc));
 491       break;
 492 #endif
 493 #ifdef HAVE_TARGET_64_LITTLE
 494     case Parameters::TARGET_64_LITTLE:
 495       dump_incremental_inputs<64, false>(
 496           argv[0], filename,
 497           static_cast<Sized_incremental_binary<64, false>*>(inc));
 498       break;
 499 #endif
 500 #ifdef HAVE_TARGET_64_BIG
 501     case Parameters::TARGET_64_BIG:
 502       dump_incremental_inputs<64, true>(
 503           argv[0], filename,
 504           static_cast<Sized_incremental_binary<64, true>*>(inc));
 505       break;
 506 #endif
 507     default:
 508       gold_unreachable();
 509     }
 510
 511   return 0;
 512 }