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           break;
 157         case INCREMENTAL_INPUT_ARCHIVE:
 158           printf("Archive\n");
 159           printf("    Member count: %d\n", input_file.get_member_count());
 160           printf("    Unused symbol count: %d\n",
 161                  input_file.get_unused_symbol_count());
 162           break;
 163         case INCREMENTAL_INPUT_SHARED_LIBRARY:
 164           printf("Shared library\n");
 165           printf("    Symbol count: %d\n",
 166                  input_file.get_global_symbol_count());
 167           break;
 168         case INCREMENTAL_INPUT_SCRIPT:
 169           printf("Linker script\n");
 170           printf("    Object count: %d\n", input_file.get_object_count());
 171           break;
 172         default:
 173           fprintf(stderr, "%s: invalid file type for object %u: %d\n",
 174                   argv0, i, input_type);
 175           exit(1);
 176         }
 177     }
 178
 179   printf("\nInput sections:\n");
 180   for (unsigned int i = 0; i < incremental_inputs.input_file_count(); ++i)
 181     {
 182       Entry_reader input_file(incremental_inputs.input_file(i));
 183
 184       if (input_file.type() != INCREMENTAL_INPUT_OBJECT
 185           && input_file.type() != INCREMENTAL_INPUT_ARCHIVE_MEMBER)
 186         continue;
 187
 188       const char* objname = input_file.filename();
 189       if (objname == NULL)
 190         {
 191           fprintf(stderr,"%s: %s: failed to get file name for object %u\n",
 192                   argv0, filename, i);
 193           exit(1);
 194         }
 195
 196       printf("[%d] %s\n", i, objname);
 197
 198       printf("    %3s  %6s  %8s  %8s  %s\n",
 199              "n", "outndx", "offset", "size", "name");
 200       unsigned int nsections = input_file.get_input_section_count();
 201       for (unsigned int shndx = 0; shndx < nsections; ++shndx)
 202         {
 203           typename Entry_reader::Input_section_info info(
 204               input_file.get_input_section(shndx));
 205           printf("    %3d  %6d  %8lld  %8lld  %s\n", shndx + 1,
 206                  info.output_shndx,
 207                  static_cast<long long>(info.sh_offset),
 208                  static_cast<long long>(info.sh_size),
 209                  info.name);
 210         }
 211     }
 212
 213   // Get a view of the .symtab section.
 214
 215   elfcpp::Elf_file<size, big_endian, Incremental_binary> elf_file(inc);
 216
 217   unsigned int symtab_shndx = elf_file.find_section_by_type(elfcpp::SHT_SYMTAB);
 218   if (symtab_shndx == elfcpp::SHN_UNDEF)  // Not found.
 219     {
 220       fprintf(stderr, "%s: %s: no symbol table section\n", argv0, filename);
 221       exit(1);
 222     }
 223   Location symtab_location(elf_file.section_contents(symtab_shndx));
 224   View symtab_view(inc->view(symtab_location));
 225
 226   // Get a view of the .strtab section.
 227
 228   unsigned int strtab_shndx = elf_file.section_link(symtab_shndx);
 229   if (strtab_shndx == elfcpp::SHN_UNDEF
 230       || strtab_shndx > elf_file.shnum()
 231       || elf_file.section_type(strtab_shndx) != elfcpp::SHT_STRTAB)
 232     {
 233       fprintf(stderr, "%s: %s: no string table section\n", argv0, filename);
 234       exit(1);
 235     }
 236   Location strtab_location(elf_file.section_contents(strtab_shndx));
 237   View strtab_view(inc->view(strtab_location));
 238   elfcpp::Elf_strtab strtab(strtab_view.data(), strtab_location.data_size);
 239
 240   // The .gnu_incremental_symtab section contains entries that parallel
 241   // the global symbols of the main symbol table.  The sh_info field
 242   // of the main symbol table's section header tells us how many global
 243   // symbols there are, but that count does not include any global
 244   // symbols that were forced local during the link.  Therefore, we
 245   // use the size of the .gnu_incremental_symtab section to deduce
 246   // the number of global symbols + forced-local symbols there are
 247   // in the symbol table.
 248   Incremental_symtab_reader<big_endian> isymtab(inc->symtab_reader());
 249   Incremental_relocs_reader<size, big_endian> irelocs(inc->relocs_reader());
 250   unsigned int sym_size = elfcpp::Elf_sizes<size>::sym_size;
 251   unsigned int nsyms = symtab_location.data_size / sym_size;
 252   unsigned int nglobals = isymtab.symbol_count();
 253   unsigned int first_global = nsyms - nglobals;
 254   unsigned const char* sym_p;
 255
 256   printf("\nGlobal symbols per input file:\n");
 257   for (unsigned int i = 0; i < incremental_inputs.input_file_count(); ++i)
 258     {
 259       Entry_reader input_file(incremental_inputs.input_file(i));
 260
 261       if (input_file.type() != INCREMENTAL_INPUT_OBJECT
 262           && input_file.type() != INCREMENTAL_INPUT_ARCHIVE_MEMBER
 263           && input_file.type() != INCREMENTAL_INPUT_SHARED_LIBRARY)
 264         continue;
 265
 266       const char* objname = input_file.filename();
 267       if (objname == NULL)
 268         {
 269           fprintf(stderr,"%s: %s: failed to get file name for object %u\n",
 270                   argv0, filename, i);
 271           exit(1);
 272         }
 273
 274       printf("[%d] %s\n", i, objname);
 275
 276       unsigned int nsyms = input_file.get_global_symbol_count();
 277       if (nsyms > 0)
 278         printf("    %6s  %6s  %8s  %8s  %8s  %8s\n",
 279                "outndx", "shndx", "offset", "chain", "#relocs", "rbase");
 280       if (input_file.type() == INCREMENTAL_INPUT_SHARED_LIBRARY)
 281         {
 282           for (unsigned int symndx = 0; symndx < nsyms; ++symndx)
 283             {
 284               bool is_def;
 285               unsigned int output_symndx =
 286                   input_file.get_output_symbol_index(symndx, &is_def);
 287               sym_p = symtab_view.data() + output_symndx * sym_size;
 288               elfcpp::Sym<size, big_endian> sym(sym_p);
 289               const char* symname;
 290               if (!strtab.get_c_string(sym.get_st_name(), &symname))
 291                 symname = "<unknown>";
 292               printf("    %6d  %6s  %8s  %8s  %8s  %8s  %-5s  %s\n",
 293                      output_symndx,
 294                      "", "", "", "", "",
 295                      is_def ? "DEF" : "UNDEF",
 296                      symname);
 297             }
 298         }
 299       else
 300         {
 301           for (unsigned int symndx = 0; symndx < nsyms; ++symndx)
 302             {
 303               Incremental_global_symbol_reader<big_endian> info(
 304                   input_file.get_global_symbol_reader(symndx));
 305               unsigned int output_symndx = info.output_symndx();
 306               sym_p = symtab_view.data() + output_symndx * sym_size;
 307               elfcpp::Sym<size, big_endian> sym(sym_p);
 308               const char* symname;
 309               if (!strtab.get_c_string(sym.get_st_name(), &symname))
 310                 symname = "<unknown>";
 311               printf("    %6d  %6d  %8d  %8d  %8d  %8d  %-5s  %s\n",
 312                      output_symndx,
 313                      info.shndx(),
 314                      input_file.get_symbol_offset(symndx),
 315                      info.next_offset(),
 316                      info.reloc_count(),
 317                      info.reloc_offset(),
 318                      info.shndx() != elfcpp::SHN_UNDEF ? "DEF" : "UNDEF",
 319                      symname);
 320             }
 321         }
 322     }
 323
 324   sym_p = symtab_view.data() + first_global * sym_size;
 325   printf("\nGlobal symbol table:\n");
 326   for (unsigned int i = 0; i < nglobals; i++)
 327     {
 328       elfcpp::Sym<size, big_endian> sym(sym_p);
 329       const char* symname;
 330       if (!strtab.get_c_string(sym.get_st_name(), &symname))
 331         symname = "<unknown>";
 332       printf("[%d] %s\n", first_global + i, symname);
 333       unsigned int offset = isymtab.get_list_head(i);
 334       while (offset > 0)
 335         {
 336           unsigned int sym_ndx;
 337           Entry_reader input_file =
 338               find_input_containing_global<size, big_endian>(incremental_inputs,
 339                                                              offset, &sym_ndx);
 340           Incremental_global_symbol_reader<big_endian> sym_info(
 341               input_file.get_global_symbol_reader(sym_ndx));
 342           printf("    %s (first reloc: %d, reloc count: %d)",
 343                  input_file.filename(), sym_info.reloc_offset(),
 344                  sym_info.reloc_count());
 345           if (sym_info.output_symndx() != first_global + i)
 346             printf(" ** wrong output symndx (%d) **", sym_info.output_symndx());
 347           printf("\n");
 348           // Dump the relocations from this input file for this symbol.
 349           unsigned int r_off = sym_info.reloc_offset();
 350           for (unsigned int j = 0; j < sym_info.reloc_count(); j++)
 351             {
 352               printf("      %4d  relocation type %3d  shndx %2d"
 353                      "  offset %016llx  addend %016llx  %s\n",
 354                      r_off,
 355                      irelocs.get_r_type(r_off),
 356                      irelocs.get_r_shndx(r_off),
 357                      static_cast<long long>(irelocs.get_r_offset(r_off)),
 358                      static_cast<long long>(irelocs.get_r_addend(r_off)),
 359                      symname);
 360               r_off += irelocs.reloc_size;
 361             }
 362           offset = sym_info.next_offset();
 363         }
 364       sym_p += sym_size;
 365     }
 366
 367   Incremental_got_plt_reader<big_endian> igot_plt(inc->got_plt_reader());
 368   unsigned int ngot = igot_plt.get_got_entry_count();
 369   unsigned int nplt = igot_plt.get_plt_entry_count();
 370
 371   printf("\nGOT entries:\n");
 372   for (unsigned int i = 0; i < ngot; ++i)
 373     {
 374       unsigned int got_type = igot_plt.get_got_type(i);
 375       unsigned int got_symndx = igot_plt.get_got_symndx(i);
 376       unsigned int got_input_index = igot_plt.get_got_input_index(i);
 377       printf("[%d] type %02x, ", i, got_type & 0x7f);
 378       if ((got_type & 0x7f) == 0x7f)
 379         printf("reserved");
 380       else if (got_type & 0x80)
 381         {
 382           Entry_reader input_file =
 383               incremental_inputs.input_file(got_input_index);
 384           const char* objname = input_file.filename();
 385           printf("local: %s (%d)", objname, got_symndx);
 386         }
 387       else
 388         {
 389           sym_p = symtab_view.data() + got_symndx * sym_size;
 390           elfcpp::Sym<size, big_endian> sym(sym_p);
 391           const char* symname;
 392           if (!strtab.get_c_string(sym.get_st_name(), &symname))
 393             symname = "<unknown>";
 394           printf("global %s (%d)", symname, got_symndx);
 395         }
 396       printf("\n");
 397     }
 398
 399   printf("\nPLT entries:\n");
 400   for (unsigned int i = 0; i < nplt; ++i)
 401     {
 402       unsigned int plt_desc = igot_plt.get_plt_desc(i);
 403       printf("[%d] ", i);
 404       sym_p = symtab_view.data() + plt_desc * sym_size;
 405       elfcpp::Sym<size, big_endian> sym(sym_p);
 406       const char* symname;
 407       if (!strtab.get_c_string(sym.get_st_name(), &symname))
 408         symname = "<unknown>";
 409       printf("%s (%d)\n", symname, plt_desc);
 410     }
 411
 412   printf("\nUnused archive symbols:\n");
 413   for (unsigned int i = 0; i < incremental_inputs.input_file_count(); ++i)
 414     {
 415       Entry_reader input_file(incremental_inputs.input_file(i));
 416
 417       if (input_file.type() != INCREMENTAL_INPUT_ARCHIVE)
 418         continue;
 419
 420       const char* objname = input_file.filename();
 421       if (objname == NULL)
 422         {
 423           fprintf(stderr,"%s: %s: failed to get file name for object %u\n",
 424                   argv0, filename, i);
 425           exit(1);
 426         }
 427
 428       printf("[%d] %s\n", i, objname);
 429       unsigned int nsyms = input_file.get_unused_symbol_count();
 430       for (unsigned int symndx = 0; symndx < nsyms; ++symndx)
 431         printf("    %s\n", input_file.get_unused_symbol(symndx));
 432     }
 433
 434 }
 435
 436 int
 437 main(int argc, char** argv)
 438 {
 439   if (argc != 2)
 440     {
 441       fprintf(stderr, "Usage: %s <file>\n", argv[0]);
 442       return 1;
 443     }
 444   const char* filename = argv[1];
 445
 446   Output_file* file = new Output_file(filename);
 447
 448   bool t = file->open_for_modification();
 449   if (!t)
 450     {
 451       fprintf(stderr, "%s: open_for_modification(%s): %s\n", argv[0], filename,
 452               strerror(errno));
 453       return 1;
 454     }
 455
 456   Incremental_binary* inc = open_incremental_binary(file);
 457
 458   if (inc == NULL)
 459     {
 460       fprintf(stderr, "%s: open_incremental_binary(%s): %s\n", argv[0],
 461               filename, strerror(errno));
 462       return 1;
 463     }
 464
 465   switch (parameters->size_and_endianness())
 466     {
 467 #ifdef HAVE_TARGET_32_LITTLE
 468     case Parameters::TARGET_32_LITTLE:
 469       dump_incremental_inputs<32, false>(
 470           argv[0], filename,
 471           static_cast<Sized_incremental_binary<32, false>*>(inc));
 472       break;
 473 #endif
 474 #ifdef HAVE_TARGET_32_BIG
 475     case Parameters::TARGET_32_BIG:
 476       dump_incremental_inputs<32, true>(
 477           argv[0], filename,
 478           static_cast<Sized_incremental_binary<32, true>*>(inc));
 479       break;
 480 #endif
 481 #ifdef HAVE_TARGET_64_LITTLE
 482     case Parameters::TARGET_64_LITTLE:
 483       dump_incremental_inputs<64, false>(
 484           argv[0], filename,
 485           static_cast<Sized_incremental_binary<64, false>*>(inc));
 486       break;
 487 #endif
 488 #ifdef HAVE_TARGET_64_BIG
 489     case Parameters::TARGET_64_BIG:
 490       dump_incremental_inputs<64, true>(
 491           argv[0], filename,
 492           static_cast<Sized_incremental_binary<64, true>*>(inc));
 493       break;
 494 #endif
 495     default:
 496       gold_unreachable();
 497     }
 498
 499   return 0;
 500 }