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)) / 16;
  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                         Incremental_binary* inc)
  77 {
  78   bool t;
  79   unsigned int inputs_shndx;
  80   unsigned int isymtab_shndx;
  81   unsigned int irelocs_shndx;
  82   unsigned int istrtab_shndx;
  83   typedef Incremental_binary::Location Location;
  84   typedef Incremental_binary::View View;
  85   typedef Incremental_inputs_reader<size, big_endian> Inputs_reader;
  86   typedef typename Inputs_reader::Incremental_input_entry_reader Entry_reader;
  87
  88   // Find the .gnu_incremental_inputs, _symtab, _relocs, and _strtab sections.
  89
  90   t = inc->find_incremental_inputs_sections(&inputs_shndx, &isymtab_shndx,
  91                                             &irelocs_shndx, &istrtab_shndx);
  92   if (!t)
  93     {
  94       fprintf(stderr, "%s: %s: no .gnu_incremental_inputs section\n", argv0,
  95               filename);
  96       exit (1);
  97     }
  98
  99   elfcpp::Elf_file<size, big_endian, Incremental_binary> elf_file(inc);
 100
 101   // Get a view of the .gnu_incremental_inputs section.
 102
 103   Location inputs_location(elf_file.section_contents(inputs_shndx));
 104   View inputs_view(inc->view(inputs_location));
 105
 106   // Get the .gnu_incremental_strtab section as a string table.
 107
 108   Location istrtab_location(elf_file.section_contents(istrtab_shndx));
 109   View istrtab_view(inc->view(istrtab_location));
 110   elfcpp::Elf_strtab istrtab(istrtab_view.data(), istrtab_location.data_size);
 111
 112   // Create a reader object for the .gnu_incremental_inputs section.
 113
 114   Incremental_inputs_reader<size, big_endian>
 115       incremental_inputs(inputs_view.data(), istrtab);
 116
 117   if (incremental_inputs.version() != 1)
 118     {
 119       fprintf(stderr, "%s: %s: unknown incremental version %d\n", argv0,
 120               filename, incremental_inputs.version());
 121       exit(1);
 122     }
 123
 124   const char* command_line = incremental_inputs.command_line();
 125   if (command_line == NULL)
 126     {
 127       fprintf(stderr,
 128               "%s: %s: failed to get link command line\n",
 129               argv0, filename);
 130       exit(1);
 131     }
 132   printf("Link command line: %s\n", command_line);
 133
 134   printf("\nInput files:\n");
 135   for (unsigned int i = 0; i < incremental_inputs.input_file_count(); ++i)
 136     {
 137       typedef Incremental_inputs_reader<size, big_endian> Inputs_reader;
 138       typename Inputs_reader::Incremental_input_entry_reader input_file =
 139           incremental_inputs.input_file(i);
 140
 141       const char* objname = input_file.filename();
 142       if (objname == NULL)
 143         {
 144           fprintf(stderr,"%s: %s: failed to get file name for object %u\n",
 145                   argv0, filename, i);
 146           exit(1);
 147         }
 148       printf("[%d] %s\n", i, objname);
 149
 150       Timespec mtime = input_file.get_mtime();
 151       printf("    Timestamp: %llu.%09d  %s",
 152              static_cast<unsigned long long>(mtime.seconds),
 153              mtime.nanoseconds,
 154              ctime(&mtime.seconds));
 155
 156       Incremental_input_type input_type = input_file.type();
 157       printf("    Type: ");
 158       switch (input_type)
 159         {
 160         case INCREMENTAL_INPUT_OBJECT:
 161           {
 162             printf("Object\n");
 163             printf("    Input section count: %d\n",
 164                    input_file.get_input_section_count());
 165             printf("    Symbol count: %d\n",
 166                    input_file.get_global_symbol_count());
 167           }
 168           break;
 169         case INCREMENTAL_INPUT_ARCHIVE_MEMBER:
 170           {
 171             printf("Archive member\n");
 172             printf("    Input section count: %d\n",
 173                    input_file.get_input_section_count());
 174             printf("    Symbol count: %d\n",
 175                    input_file.get_global_symbol_count());
 176           }
 177           break;
 178         case INCREMENTAL_INPUT_ARCHIVE:
 179           {
 180             printf("Archive\n");
 181             printf("    Member count: %d\n", input_file.get_member_count());
 182             printf("    Unused symbol count: %d\n",
 183                    input_file.get_unused_symbol_count());
 184           }
 185           break;
 186         case INCREMENTAL_INPUT_SHARED_LIBRARY:
 187           {
 188             printf("Shared library\n");
 189             printf("    Symbol count: %d\n",
 190                    input_file.get_global_symbol_count());
 191           }
 192           break;
 193         case INCREMENTAL_INPUT_SCRIPT:
 194           printf("Linker script\n");
 195           break;
 196         default:
 197           fprintf(stderr, "%s: invalid file type for object %u: %d\n",
 198                   argv0, i, input_type);
 199           exit(1);
 200         }
 201     }
 202
 203   printf("\nInput sections:\n");
 204   for (unsigned int i = 0; i < incremental_inputs.input_file_count(); ++i)
 205     {
 206       typedef Incremental_inputs_reader<size, big_endian> Inputs_reader;
 207       typedef typename Inputs_reader::Incremental_input_entry_reader
 208           Entry_reader;
 209
 210       Entry_reader input_file(incremental_inputs.input_file(i));
 211
 212       if (input_file.type() != INCREMENTAL_INPUT_OBJECT
 213           && input_file.type() != INCREMENTAL_INPUT_ARCHIVE_MEMBER)
 214         continue;
 215
 216       const char* objname = input_file.filename();
 217       if (objname == NULL)
 218         {
 219           fprintf(stderr,"%s: %s: failed to get file name for object %u\n",
 220                   argv0, filename, i);
 221           exit(1);
 222         }
 223
 224       printf("[%d] %s\n", i, objname);
 225
 226       printf("    %3s  %6s  %8s  %8s  %s\n",
 227              "n", "outndx", "offset", "size", "name");
 228       unsigned int nsections = input_file.get_input_section_count();
 229       for (unsigned int shndx = 0; shndx < nsections; ++shndx)
 230         {
 231           typename Entry_reader::Input_section_info info(
 232               input_file.get_input_section(shndx));
 233           printf("    %3d  %6d  %8lld  %8lld  %s\n", shndx,
 234                  info.output_shndx,
 235                  static_cast<long long>(info.sh_offset),
 236                  static_cast<long long>(info.sh_size),
 237                  info.name);
 238         }
 239     }
 240
 241   printf("\nGlobal symbols per input file:\n");
 242   for (unsigned int i = 0; i < incremental_inputs.input_file_count(); ++i)
 243     {
 244       typedef Incremental_inputs_reader<size, big_endian> Inputs_reader;
 245       typedef typename Inputs_reader::Incremental_input_entry_reader
 246           Entry_reader;
 247
 248       Entry_reader input_file(incremental_inputs.input_file(i));
 249
 250       if (input_file.type() != INCREMENTAL_INPUT_OBJECT
 251           && input_file.type() != INCREMENTAL_INPUT_ARCHIVE_MEMBER)
 252         continue;
 253
 254       const char* objname = input_file.filename();
 255       if (objname == NULL)
 256         {
 257           fprintf(stderr,"%s: %s: failed to get file name for object %u\n",
 258                   argv0, filename, i);
 259           exit(1);
 260         }
 261
 262       printf("[%d] %s\n", i, objname);
 263
 264       unsigned int nsyms = input_file.get_global_symbol_count();
 265       if (nsyms > 0)
 266         printf("    %6s  %8s  %8s  %8s  %8s\n",
 267                "outndx", "offset", "chain", "#relocs", "rbase");
 268       for (unsigned int symndx = 0; symndx < nsyms; ++symndx)
 269         {
 270           typename Entry_reader::Global_symbol_info info(
 271               input_file.get_global_symbol_info(symndx));
 272           printf("    %6d  %8d  %8d  %8d  %8d\n",
 273                  info.output_symndx,
 274                  input_file.get_symbol_offset(symndx),
 275                  info.next_offset,
 276                  info.reloc_count,
 277                  info.reloc_offset);
 278         }
 279     }
 280
 281   // Get a view of the .symtab section.
 282
 283   unsigned int symtab_shndx = elf_file.find_section_by_type(elfcpp::SHT_SYMTAB);
 284   if (symtab_shndx == elfcpp::SHN_UNDEF)  // Not found.
 285     {
 286       fprintf(stderr, "%s: %s: no symbol table section\n", argv0, filename);
 287       exit (1);
 288     }
 289   Location symtab_location(elf_file.section_contents(symtab_shndx));
 290   View symtab_view(inc->view(symtab_location));
 291
 292   // Get a view of the .strtab section.
 293
 294   unsigned int strtab_shndx = elf_file.section_link(symtab_shndx);
 295   if (strtab_shndx == elfcpp::SHN_UNDEF
 296       || strtab_shndx > elf_file.shnum()
 297       || elf_file.section_type(strtab_shndx) != elfcpp::SHT_STRTAB)
 298     {
 299       fprintf(stderr, "%s: %s: no string table section\n", argv0, filename);
 300       exit (1);
 301     }
 302   Location strtab_location(elf_file.section_contents(strtab_shndx));
 303   View strtab_view(inc->view(strtab_location));
 304   elfcpp::Elf_strtab strtab(strtab_view.data(), strtab_location.data_size);
 305
 306   // Get a view of the .gnu_incremental_symtab section.
 307
 308   Location isymtab_location(elf_file.section_contents(isymtab_shndx));
 309   View isymtab_view(inc->view(isymtab_location));
 310
 311   // Get a view of the .gnu_incremental_relocs section.
 312
 313   Location irelocs_location(elf_file.section_contents(irelocs_shndx));
 314   View irelocs_view(inc->view(irelocs_location));
 315
 316   // The .gnu_incremental_symtab section contains entries that parallel
 317   // the global symbols of the main symbol table.  The sh_info field
 318   // of the main symbol table's section header tells us how many global
 319   // symbols there are, but that count does not include any global
 320   // symbols that were forced local during the link.  Therefore, we
 321   // use the size of the .gnu_incremental_symtab section to deduce
 322   // the number of global symbols + forced-local symbols there are
 323   // in the symbol table.
 324   unsigned int sym_size = elfcpp::Elf_sizes<size>::sym_size;
 325   unsigned int nsyms = symtab_location.data_size / sym_size;
 326   unsigned int nglobals = isymtab_location.data_size / 4;
 327   unsigned int first_global = nsyms - nglobals;
 328   unsigned const char* sym_p = symtab_view.data() + first_global * sym_size;
 329   unsigned const char* isym_p = isymtab_view.data();
 330
 331   Incremental_symtab_reader<big_endian> isymtab(isymtab_view.data());
 332   Incremental_relocs_reader<size, big_endian> irelocs(irelocs_view.data());
 333
 334   printf("\nGlobal symbol table:\n");
 335   for (unsigned int i = 0; i < nglobals; i++)
 336     {
 337       elfcpp::Sym<size, big_endian> sym(sym_p);
 338       const char* symname;
 339       if (!strtab.get_c_string(sym.get_st_name(), &symname))
 340         symname = "<unknown>";
 341       printf("[%d] %s\n", first_global + i, symname);
 342       unsigned int offset = isymtab.get_list_head(i);
 343       while (offset > 0)
 344         {
 345           unsigned int sym_ndx;
 346           Entry_reader input_file =
 347               find_input_containing_global<size, big_endian>(incremental_inputs,
 348                                                              offset, &sym_ndx);
 349           typename Entry_reader::Global_symbol_info sym_info(
 350               input_file.get_global_symbol_info(sym_ndx));
 351           printf("    %s (first reloc: %d, reloc count: %d)",
 352                  input_file.filename(), sym_info.reloc_offset,
 353                  sym_info.reloc_count);
 354           if (sym_info.output_symndx != first_global + i)
 355             printf(" ** wrong output symndx (%d) **", sym_info.output_symndx);
 356           printf("\n");
 357           // Dump the relocations from this input file for this symbol.
 358           unsigned int r_off = sym_info.reloc_offset;
 359           for (unsigned int j = 0; j < sym_info.reloc_count; j++)
 360             {
 361               printf("      %4d  relocation type %3d  shndx %d"
 362                      "  offset %016llx  addend %016llx  %s\n",
 363                      r_off,
 364                      irelocs.get_r_type(r_off),
 365                      irelocs.get_r_shndx(r_off),
 366                      static_cast<long long>(irelocs.get_r_offset(r_off)),
 367                      static_cast<long long>(irelocs.get_r_addend(r_off)),
 368                      symname);
 369               r_off += irelocs.reloc_size;
 370             }
 371           offset = sym_info.next_offset;
 372         }
 373       sym_p += sym_size;
 374       isym_p += 4;
 375     }
 376
 377   printf("\nUnused archive symbols:\n");
 378   for (unsigned int i = 0; i < incremental_inputs.input_file_count(); ++i)
 379     {
 380       Entry_reader input_file(incremental_inputs.input_file(i));
 381
 382       if (input_file.type() != INCREMENTAL_INPUT_ARCHIVE)
 383         continue;
 384
 385       const char* objname = input_file.filename();
 386       if (objname == NULL)
 387         {
 388           fprintf(stderr,"%s: %s: failed to get file name for object %u\n",
 389                   argv0, filename, i);
 390           exit(1);
 391         }
 392
 393       printf("[%d] %s\n", i, objname);
 394       unsigned int nsyms = input_file.get_unused_symbol_count();
 395       for (unsigned int symndx = 0; symndx < nsyms; ++symndx)
 396         printf("    %s\n", input_file.get_unused_symbol(symndx));
 397     }
 398
 399 }
 400
 401 int
 402 main(int argc, char** argv)
 403 {
 404   if (argc != 2)
 405     {
 406       fprintf(stderr, "Usage: %s <file>\n", argv[0]);
 407       return 1;
 408     }
 409   const char* filename = argv[1];
 410
 411   Output_file* file = new Output_file(filename);
 412
 413   bool t = file->open_for_modification();
 414   if (!t)
 415     {
 416       fprintf(stderr, "%s: open_for_modification(%s): %s\n", argv[0], filename,
 417               strerror(errno));
 418       return 1;
 419     }
 420
 421   Incremental_binary* inc = open_incremental_binary(file);
 422
 423   if (inc == NULL)
 424     {
 425       fprintf(stderr, "%s: open_incremental_binary(%s): %s\n", argv[0],
 426               filename, strerror(errno));
 427       return 1;
 428     }
 429
 430   switch (parameters->size_and_endianness())
 431     {
 432 #ifdef HAVE_TARGET_32_LITTLE
 433     case Parameters::TARGET_32_LITTLE:
 434       dump_incremental_inputs<32, false>(argv[0], filename, inc);
 435       break;
 436 #endif
 437 #ifdef HAVE_TARGET_32_BIG
 438     case Parameters::TARGET_32_BIG:
 439       dump_incremental_inputs<32, true>(argv[0], filename, inc);
 440       break;
 441 #endif
 442 #ifdef HAVE_TARGET_64_LITTLE
 443     case Parameters::TARGET_64_LITTLE:
 444       dump_incremental_inputs<64, false>(argv[0], filename, inc);
 445       break;
 446 #endif
 447 #ifdef HAVE_TARGET_64_BIG
 448     case Parameters::TARGET_64_BIG:
 449       dump_incremental_inputs<64, true>(argv[0], filename, inc);
 450       break;
 451 #endif
 452     default:
 453       gold_unreachable();
 454     }
 455
 456   return 0;
 457 }