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           printf("Object\n");
 142           printf("    Input section count: %d\n",
 143                  input_file.get_input_section_count());
 144           printf("    Symbol count: %d\n",
 145                  input_file.get_global_symbol_count());
 146           break;
 147         case INCREMENTAL_INPUT_ARCHIVE_MEMBER:
 148           printf("Archive member\n");
 149           printf("    Input section count: %d\n",
 150                  input_file.get_input_section_count());
 151           printf("    Symbol count: %d\n",
 152                  input_file.get_global_symbol_count());
 153           break;
 154         case INCREMENTAL_INPUT_ARCHIVE:
 155           printf("Archive\n");
 156           printf("    Member count: %d\n", input_file.get_member_count());
 157           printf("    Unused symbol count: %d\n",
 158                  input_file.get_unused_symbol_count());
 159           break;
 160         case INCREMENTAL_INPUT_SHARED_LIBRARY:
 161           printf("Shared library\n");
 162           printf("    Symbol count: %d\n",
 163                  input_file.get_global_symbol_count());
 164           break;
 165         case INCREMENTAL_INPUT_SCRIPT:
 166           printf("Linker script\n");
 167           printf("    Object count: %d\n", input_file.get_object_count());
 168           break;
 169         default:
 170           fprintf(stderr, "%s: invalid file type for object %u: %d\n",
 171                   argv0, i, input_type);
 172           exit(1);
 173         }
 174     }
 175
 176   printf("\nInput sections:\n");
 177   for (unsigned int i = 0; i < incremental_inputs.input_file_count(); ++i)
 178     {
 179       Entry_reader input_file(incremental_inputs.input_file(i));
 180
 181       if (input_file.type() != INCREMENTAL_INPUT_OBJECT
 182           && input_file.type() != INCREMENTAL_INPUT_ARCHIVE_MEMBER)
 183         continue;
 184
 185       const char* objname = input_file.filename();
 186       if (objname == NULL)
 187         {
 188           fprintf(stderr,"%s: %s: failed to get file name for object %u\n",
 189                   argv0, filename, i);
 190           exit(1);
 191         }
 192
 193       printf("[%d] %s\n", i, objname);
 194
 195       printf("    %3s  %6s  %8s  %8s  %s\n",
 196              "n", "outndx", "offset", "size", "name");
 197       unsigned int nsections = input_file.get_input_section_count();
 198       for (unsigned int shndx = 0; shndx < nsections; ++shndx)
 199         {
 200           typename Entry_reader::Input_section_info info(
 201               input_file.get_input_section(shndx));
 202           printf("    %3d  %6d  %8lld  %8lld  %s\n", shndx + 1,
 203                  info.output_shndx,
 204                  static_cast<long long>(info.sh_offset),
 205                  static_cast<long long>(info.sh_size),
 206                  info.name);
 207         }
 208     }
 209
 210   // Get a view of the .symtab section.
 211
 212   elfcpp::Elf_file<size, big_endian, Incremental_binary> elf_file(inc);
 213
 214   unsigned int symtab_shndx = elf_file.find_section_by_type(elfcpp::SHT_SYMTAB);
 215   if (symtab_shndx == elfcpp::SHN_UNDEF)  // Not found.
 216     {
 217       fprintf(stderr, "%s: %s: no symbol table section\n", argv0, filename);
 218       exit(1);
 219     }
 220   Location symtab_location(elf_file.section_contents(symtab_shndx));
 221   View symtab_view(inc->view(symtab_location));
 222
 223   // Get a view of the .strtab section.
 224
 225   unsigned int strtab_shndx = elf_file.section_link(symtab_shndx);
 226   if (strtab_shndx == elfcpp::SHN_UNDEF
 227       || strtab_shndx > elf_file.shnum()
 228       || elf_file.section_type(strtab_shndx) != elfcpp::SHT_STRTAB)
 229     {
 230       fprintf(stderr, "%s: %s: no string table section\n", argv0, filename);
 231       exit(1);
 232     }
 233   Location strtab_location(elf_file.section_contents(strtab_shndx));
 234   View strtab_view(inc->view(strtab_location));
 235   elfcpp::Elf_strtab strtab(strtab_view.data(), strtab_location.data_size);
 236
 237   // The .gnu_incremental_symtab section contains entries that parallel
 238   // the global symbols of the main symbol table.  The sh_info field
 239   // of the main symbol table's section header tells us how many global
 240   // symbols there are, but that count does not include any global
 241   // symbols that were forced local during the link.  Therefore, we
 242   // use the size of the .gnu_incremental_symtab section to deduce
 243   // the number of global symbols + forced-local symbols there are
 244   // in the symbol table.
 245   Incremental_symtab_reader<big_endian> isymtab(inc->symtab_reader());
 246   Incremental_relocs_reader<size, big_endian> irelocs(inc->relocs_reader());
 247   unsigned int sym_size = elfcpp::Elf_sizes<size>::sym_size;
 248   unsigned int nsyms = symtab_location.data_size / sym_size;
 249   unsigned int nglobals = isymtab.symbol_count();
 250   unsigned int first_global = nsyms - nglobals;
 251   unsigned const char* sym_p;
 252
 253   printf("\nGlobal symbols per input file:\n");
 254   for (unsigned int i = 0; i < incremental_inputs.input_file_count(); ++i)
 255     {
 256       Entry_reader input_file(incremental_inputs.input_file(i));
 257
 258       if (input_file.type() != INCREMENTAL_INPUT_OBJECT
 259           && input_file.type() != INCREMENTAL_INPUT_ARCHIVE_MEMBER
 260           && input_file.type() != INCREMENTAL_INPUT_SHARED_LIBRARY)
 261         continue;
 262
 263       const char* objname = input_file.filename();
 264       if (objname == NULL)
 265         {
 266           fprintf(stderr,"%s: %s: failed to get file name for object %u\n",
 267                   argv0, filename, i);
 268           exit(1);
 269         }
 270
 271       printf("[%d] %s\n", i, objname);
 272
 273       unsigned int nsyms = input_file.get_global_symbol_count();
 274       if (nsyms > 0)
 275         printf("    %6s  %6s  %8s  %8s  %8s  %8s\n",
 276                "outndx", "shndx", "offset", "chain", "#relocs", "rbase");
 277       if (input_file.type() == INCREMENTAL_INPUT_SHARED_LIBRARY)
 278         {
 279           for (unsigned int symndx = 0; symndx < nsyms; ++symndx)
 280             {
 281               bool is_def;
 282               unsigned int output_symndx =
 283                   input_file.get_output_symbol_index(symndx, &is_def);
 284               sym_p = symtab_view.data() + output_symndx * sym_size;
 285               elfcpp::Sym<size, big_endian> sym(sym_p);
 286               const char* symname;
 287               if (!strtab.get_c_string(sym.get_st_name(), &symname))
 288                 symname = "<unknown>";
 289               printf("    %6d  %6s  %8s  %8s  %8s  %8s  %-5s  %s\n",
 290                      output_symndx,
 291                      "", "", "", "", "",
 292                      is_def ? "DEF" : "UNDEF",
 293                      symname);
 294             }
 295         }
 296       else
 297         {
 298           for (unsigned int symndx = 0; symndx < nsyms; ++symndx)
 299             {
 300               Incremental_global_symbol_reader<big_endian> info(
 301                   input_file.get_global_symbol_reader(symndx));
 302               unsigned int output_symndx = info.output_symndx();
 303               sym_p = symtab_view.data() + output_symndx * sym_size;
 304               elfcpp::Sym<size, big_endian> sym(sym_p);
 305               const char* symname;
 306               if (!strtab.get_c_string(sym.get_st_name(), &symname))
 307                 symname = "<unknown>";
 308               printf("    %6d  %6d  %8d  %8d  %8d  %8d  %-5s  %s\n",
 309                      output_symndx,
 310                      info.shndx(),
 311                      input_file.get_symbol_offset(symndx),
 312                      info.next_offset(),
 313                      info.reloc_count(),
 314                      info.reloc_offset(),
 315                      info.shndx() != elfcpp::SHN_UNDEF ? "DEF" : "UNDEF",
 316                      symname);
 317             }
 318         }
 319     }
 320
 321   sym_p = symtab_view.data() + first_global * sym_size;
 322   printf("\nGlobal symbol table:\n");
 323   for (unsigned int i = 0; i < nglobals; i++)
 324     {
 325       elfcpp::Sym<size, big_endian> sym(sym_p);
 326       const char* symname;
 327       if (!strtab.get_c_string(sym.get_st_name(), &symname))
 328         symname = "<unknown>";
 329       printf("[%d] %s\n", first_global + i, symname);
 330       unsigned int offset = isymtab.get_list_head(i);
 331       while (offset > 0)
 332         {
 333           unsigned int sym_ndx;
 334           Entry_reader input_file =
 335               find_input_containing_global<size, big_endian>(incremental_inputs,
 336                                                              offset, &sym_ndx);
 337           Incremental_global_symbol_reader<big_endian> sym_info(
 338               input_file.get_global_symbol_reader(sym_ndx));
 339           printf("    %s (first reloc: %d, reloc count: %d)",
 340                  input_file.filename(), sym_info.reloc_offset(),
 341                  sym_info.reloc_count());
 342           if (sym_info.output_symndx() != first_global + i)
 343             printf(" ** wrong output symndx (%d) **", sym_info.output_symndx());
 344           printf("\n");
 345           // Dump the relocations from this input file for this symbol.
 346           unsigned int r_off = sym_info.reloc_offset();
 347           for (unsigned int j = 0; j < sym_info.reloc_count(); j++)
 348             {
 349               printf("      %4d  relocation type %3d  shndx %2d"
 350                      "  offset %016llx  addend %016llx  %s\n",
 351                      r_off,
 352                      irelocs.get_r_type(r_off),
 353                      irelocs.get_r_shndx(r_off),
 354                      static_cast<long long>(irelocs.get_r_offset(r_off)),
 355                      static_cast<long long>(irelocs.get_r_addend(r_off)),
 356                      symname);
 357               r_off += irelocs.reloc_size;
 358             }
 359           offset = sym_info.next_offset();
 360         }
 361       sym_p += sym_size;
 362     }
 363
 364   Incremental_got_plt_reader<big_endian> igot_plt(inc->got_plt_reader());
 365   unsigned int ngot = igot_plt.get_got_entry_count();
 366   unsigned int nplt = igot_plt.get_plt_entry_count();
 367
 368   printf("\nGOT entries:\n");
 369   for (unsigned int i = 0; i < ngot; ++i)
 370     {
 371       unsigned int got_type = igot_plt.get_got_type(i);
 372       unsigned int got_desc = igot_plt.get_got_desc(i);
 373       printf("[%d] type %02x, ", i, got_type & 0x7f);
 374       if (got_type == 0x7f)
 375         printf("reserved");
 376       else if (got_type & 0x80)
 377         {
 378           Entry_reader input_file = incremental_inputs.input_file(got_desc);
 379           const char* objname = input_file.filename();
 380           printf("local: %s (%d)", objname, got_desc);
 381         }
 382       else
 383         {
 384           sym_p = symtab_view.data() + got_desc * sym_size;
 385           elfcpp::Sym<size, big_endian> sym(sym_p);
 386           const char* symname;
 387           if (!strtab.get_c_string(sym.get_st_name(), &symname))
 388             symname = "<unknown>";
 389           printf("global %s (%d)", symname, got_desc);
 390         }
 391       printf("\n");
 392     }
 393
 394   printf("\nPLT entries:\n");
 395   for (unsigned int i = 0; i < nplt; ++i)
 396     {
 397       unsigned int plt_desc = igot_plt.get_plt_desc(i);
 398       printf("[%d] ", i);
 399       sym_p = symtab_view.data() + plt_desc * sym_size;
 400       elfcpp::Sym<size, big_endian> sym(sym_p);
 401       const char* symname;
 402       if (!strtab.get_c_string(sym.get_st_name(), &symname))
 403         symname = "<unknown>";
 404       printf("%s (%d)\n", symname, plt_desc);
 405     }
 406
 407   printf("\nUnused archive symbols:\n");
 408   for (unsigned int i = 0; i < incremental_inputs.input_file_count(); ++i)
 409     {
 410       Entry_reader input_file(incremental_inputs.input_file(i));
 411
 412       if (input_file.type() != INCREMENTAL_INPUT_ARCHIVE)
 413         continue;
 414
 415       const char* objname = input_file.filename();
 416       if (objname == NULL)
 417         {
 418           fprintf(stderr,"%s: %s: failed to get file name for object %u\n",
 419                   argv0, filename, i);
 420           exit(1);
 421         }
 422
 423       printf("[%d] %s\n", i, objname);
 424       unsigned int nsyms = input_file.get_unused_symbol_count();
 425       for (unsigned int symndx = 0; symndx < nsyms; ++symndx)
 426         printf("    %s\n", input_file.get_unused_symbol(symndx));
 427     }
 428
 429 }
 430
 431 int
 432 main(int argc, char** argv)
 433 {
 434   if (argc != 2)
 435     {
 436       fprintf(stderr, "Usage: %s <file>\n", argv[0]);
 437       return 1;
 438     }
 439   const char* filename = argv[1];
 440
 441   Output_file* file = new Output_file(filename);
 442
 443   bool t = file->open_for_modification();
 444   if (!t)
 445     {
 446       fprintf(stderr, "%s: open_for_modification(%s): %s\n", argv[0], filename,
 447               strerror(errno));
 448       return 1;
 449     }
 450
 451   Incremental_binary* inc = open_incremental_binary(file);
 452
 453   if (inc == NULL)
 454     {
 455       fprintf(stderr, "%s: open_incremental_binary(%s): %s\n", argv[0],
 456               filename, strerror(errno));
 457       return 1;
 458     }
 459
 460   switch (parameters->size_and_endianness())
 461     {
 462 #ifdef HAVE_TARGET_32_LITTLE
 463     case Parameters::TARGET_32_LITTLE:
 464       dump_incremental_inputs<32, false>(
 465           argv[0], filename,
 466           static_cast<Sized_incremental_binary<32, false>*>(inc));
 467       break;
 468 #endif
 469 #ifdef HAVE_TARGET_32_BIG
 470     case Parameters::TARGET_32_BIG:
 471       dump_incremental_inputs<32, true>(
 472           argv[0], filename,
 473           static_cast<Sized_incremental_binary<32, true>*>(inc));
 474       break;
 475 #endif
 476 #ifdef HAVE_TARGET_64_LITTLE
 477     case Parameters::TARGET_64_LITTLE:
 478       dump_incremental_inputs<64, false>(
 479           argv[0], filename,
 480           static_cast<Sized_incremental_binary<64, false>*>(inc));
 481       break;
 482 #endif
 483 #ifdef HAVE_TARGET_64_BIG
 484     case Parameters::TARGET_64_BIG:
 485       dump_incremental_inputs<64, true>(
 486           argv[0], filename,
 487           static_cast<Sized_incremental_binary<64, true>*>(inc));
 488       break;
 489 #endif
 490     default:
 491       gold_unreachable();
 492     }
 493
 494   return 0;
 495 }