contrib/binutils-2.22/gold/merge.cc

   1 // merge.cc -- handle section merging for gold
   2
   3 // Copyright 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
   4 // Written by Ian Lance Taylor <iant@google.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 #include "gold.h"
  24
  25 #include <cstdlib>
  26 #include <algorithm>
  27
  28 #include "merge.h"
  29 #include "compressed_output.h"
  30
  31 namespace gold
  32 {
  33
  34 // Class Object_merge_map.
  35
  36 // Destructor.
  37
  38 Object_merge_map::~Object_merge_map()
  39 {
  40   for (Section_merge_maps::iterator p = this->section_merge_maps_.begin();
  41        p != this->section_merge_maps_.end();
  42        ++p)
  43     delete p->second;
  44 }
  45
  46 // Get the Input_merge_map to use for an input section, or NULL.
  47
  48 Object_merge_map::Input_merge_map*
  49 Object_merge_map::get_input_merge_map(unsigned int shndx)
  50 {
  51   gold_assert(shndx != -1U);
  52   if (shndx == this->first_shnum_)
  53     return &this->first_map_;
  54   if (shndx == this->second_shnum_)
  55     return &this->second_map_;
  56   Section_merge_maps::const_iterator p = this->section_merge_maps_.find(shndx);
  57   if (p != this->section_merge_maps_.end())
  58     return p->second;
  59   return NULL;
  60 }
  61
  62 // Get or create the Input_merge_map to use for an input section.
  63
  64 Object_merge_map::Input_merge_map*
  65 Object_merge_map::get_or_make_input_merge_map(const Merge_map* merge_map,
  66                                               unsigned int shndx)
  67 {
  68   Input_merge_map* map = this->get_input_merge_map(shndx);
  69   if (map != NULL)
  70     {
  71       // For a given input section in a given object, every mapping
  72       // must be done with the same Merge_map.
  73       gold_assert(map->merge_map == merge_map);
  74       return map;
  75     }
  76
  77   // We need to create a new entry.
  78   if (this->first_shnum_ == -1U)
  79     {
  80       this->first_shnum_ = shndx;
  81       this->first_map_.merge_map = merge_map;
  82       return &this->first_map_;
  83     }
  84   if (this->second_shnum_ == -1U)
  85     {
  86       this->second_shnum_ = shndx;
  87       this->second_map_.merge_map = merge_map;
  88       return &this->second_map_;
  89     }
  90
  91   Input_merge_map* new_map = new Input_merge_map;
  92   new_map->merge_map = merge_map;
  93   this->section_merge_maps_[shndx] = new_map;
  94   return new_map;
  95 }
  96
  97 // Add a mapping.
  98
  99 void
 100 Object_merge_map::add_mapping(const Merge_map* merge_map, unsigned int shndx,
 101                               section_offset_type input_offset,
 102                               section_size_type length,
 103                               section_offset_type output_offset)
 104 {
 105   Input_merge_map* map = this->get_or_make_input_merge_map(merge_map, shndx);
 106
 107   // Try to merge the new entry in the last one we saw.
 108   if (!map->entries.empty())
 109     {
 110       Input_merge_entry& entry(map->entries.back());
 111
 112       // Use section_size_type to avoid signed/unsigned warnings.
 113       section_size_type input_offset_u = input_offset;
 114       section_size_type output_offset_u = output_offset;
 115
 116       // If this entry is not in order, we need to sort the vector
 117       // before looking anything up.
 118       if (input_offset_u < entry.input_offset + entry.length)
 119         {
 120           gold_assert(input_offset < entry.input_offset);
 121           gold_assert(input_offset_u + length
 122                       <= static_cast<section_size_type>(entry.input_offset));
 123           map->sorted = false;
 124         }
 125       else if (entry.input_offset + entry.length == input_offset_u
 126                && (output_offset == -1
 127                    ? entry.output_offset == -1
 128                    : entry.output_offset + entry.length == output_offset_u))
 129         {
 130           entry.length += length;
 131           return;
 132         }
 133     }
 134
 135   Input_merge_entry entry;
 136   entry.input_offset = input_offset;
 137   entry.length = length;
 138   entry.output_offset = output_offset;
 139   map->entries.push_back(entry);
 140 }
 141
 142 // Get the output offset for an input address.
 143
 144 bool
 145 Object_merge_map::get_output_offset(const Merge_map* merge_map,
 146                                     unsigned int shndx,
 147                                     section_offset_type input_offset,
 148                                     section_offset_type* output_offset)
 149 {
 150   Input_merge_map* map = this->get_input_merge_map(shndx);
 151   if (map == NULL
 152       || (merge_map != NULL && map->merge_map != merge_map))
 153     return false;
 154
 155   if (!map->sorted)
 156     {
 157       std::sort(map->entries.begin(), map->entries.end(),
 158                 Input_merge_compare());
 159       map->sorted = true;
 160     }
 161
 162   Input_merge_entry entry;
 163   entry.input_offset = input_offset;
 164   std::vector<Input_merge_entry>::const_iterator p =
 165     std::lower_bound(map->entries.begin(), map->entries.end(),
 166                      entry, Input_merge_compare());
 167   if (p == map->entries.end() || p->input_offset > input_offset)
 168     {
 169       if (p == map->entries.begin())
 170         return false;
 171       --p;
 172       gold_assert(p->input_offset <= input_offset);
 173     }
 174
 175   if (input_offset - p->input_offset
 176       >= static_cast<section_offset_type>(p->length))
 177     return false;
 178
 179   *output_offset = p->output_offset;
 180   if (*output_offset != -1)
 181     *output_offset += (input_offset - p->input_offset);
 182   return true;
 183 }
 184
 185 // Return whether this is the merge map for section SHNDX.
 186
 187 inline bool
 188 Object_merge_map::is_merge_section_for(const Merge_map* merge_map,
 189                                        unsigned int shndx)
 190 {
 191   Input_merge_map* map = this->get_input_merge_map(shndx);
 192   return map != NULL && map->merge_map == merge_map;
 193 }
 194
 195 // Initialize a mapping from input offsets to output addresses.
 196
 197 template<int size>
 198 void
 199 Object_merge_map::initialize_input_to_output_map(
 200     unsigned int shndx,
 201     typename elfcpp::Elf_types<size>::Elf_Addr starting_address,
 202     Unordered_map<section_offset_type,
 203                   typename elfcpp::Elf_types<size>::Elf_Addr>* initialize_map)
 204 {
 205   Input_merge_map* map = this->get_input_merge_map(shndx);
 206   gold_assert(map != NULL);
 207
 208   gold_assert(initialize_map->empty());
 209   // We know how many entries we are going to add.
 210   // reserve_unordered_map takes an expected count of buckets, not a
 211   // count of elements, so double it to try to reduce collisions.
 212   reserve_unordered_map(initialize_map, map->entries.size() * 2);
 213
 214   for (Input_merge_map::Entries::const_iterator p = map->entries.begin();
 215        p != map->entries.end();
 216        ++p)
 217     {
 218       section_offset_type output_offset = p->output_offset;
 219       if (output_offset != -1)
 220         output_offset += starting_address;
 221       else
 222         {
 223           // If we see a relocation against an address we have chosen
 224           // to discard, we relocate to zero.  FIXME: We could also
 225           // issue a warning in this case; that would require
 226           // reporting this somehow and checking it in the routines in
 227           // reloc.h.
 228           output_offset = 0;
 229         }
 230       initialize_map->insert(std::make_pair(p->input_offset, output_offset));
 231     }
 232 }
 233
 234 // Class Merge_map.
 235
 236 // Add a mapping for the bytes from OFFSET to OFFSET + LENGTH in input
 237 // section SHNDX in object OBJECT to an OUTPUT_OFFSET in merged data
 238 // in an output section.
 239
 240 void
 241 Merge_map::add_mapping(Relobj* object, unsigned int shndx,
 242                        section_offset_type offset, section_size_type length,
 243                        section_offset_type output_offset)
 244 {
 245   gold_assert(object != NULL);
 246   Object_merge_map* object_merge_map = object->merge_map();
 247   if (object_merge_map == NULL)
 248     {
 249       object_merge_map = new Object_merge_map();
 250       object->set_merge_map(object_merge_map);
 251     }
 252
 253   object_merge_map->add_mapping(this, shndx, offset, length, output_offset);
 254 }
 255
 256 // Return the output offset for an input address.  The input address
 257 // is at offset OFFSET in section SHNDX in OBJECT.  This sets
 258 // *OUTPUT_OFFSET to the offset in the merged data in the output
 259 // section.  This returns true if the mapping is known, false
 260 // otherwise.
 261
 262 bool
 263 Merge_map::get_output_offset(const Relobj* object, unsigned int shndx,
 264                              section_offset_type offset,
 265                              section_offset_type* output_offset) const
 266 {
 267   Object_merge_map* object_merge_map = object->merge_map();
 268   if (object_merge_map == NULL)
 269     return false;
 270   return object_merge_map->get_output_offset(this, shndx, offset,
 271                                              output_offset);
 272 }
 273
 274 // Return whether this is the merge section for SHNDX in OBJECT.
 275
 276 bool
 277 Merge_map::is_merge_section_for(const Relobj* object, unsigned int shndx) const
 278 {
 279   Object_merge_map* object_merge_map = object->merge_map();
 280   if (object_merge_map == NULL)
 281     return false;
 282   return object_merge_map->is_merge_section_for(this, shndx);
 283 }
 284
 285 // Class Output_merge_base.
 286
 287 // Return the output offset for an input offset.  The input address is
 288 // at offset OFFSET in section SHNDX in OBJECT.  If we know the
 289 // offset, set *POUTPUT and return true.  Otherwise return false.
 290
 291 bool
 292 Output_merge_base::do_output_offset(const Relobj* object,
 293                                     unsigned int shndx,
 294                                     section_offset_type offset,
 295                                     section_offset_type* poutput) const
 296 {
 297   return this->merge_map_.get_output_offset(object, shndx, offset, poutput);
 298 }
 299
 300 // Return whether this is the merge section for SHNDX in OBJECT.
 301
 302 bool
 303 Output_merge_base::do_is_merge_section_for(const Relobj* object,
 304                                            unsigned int shndx) const
 305 {
 306   return this->merge_map_.is_merge_section_for(object, shndx);
 307 }
 308
 309 // Record a merged input section for script processing.
 310
 311 void
 312 Output_merge_base::record_input_section(Relobj* relobj, unsigned int shndx)
 313 {
 314   gold_assert(this->keeps_input_sections_ && relobj != NULL);
 315   // If this is the first input section, record it.  We need do this because
 316   // this->input_sections_ is unordered.
 317   if (this->first_relobj_ == NULL)
 318     {
 319       this->first_relobj_ = relobj;
 320       this->first_shndx_ = shndx;
 321     }
 322
 323   std::pair<Input_sections::iterator, bool> result =
 324     this->input_sections_.insert(Section_id(relobj, shndx));
 325   // We should insert a merge section once only.
 326   gold_assert(result.second);
 327 }
 328
 329 // Class Output_merge_data.
 330
 331 // Compute the hash code for a fixed-size constant.
 332
 333 size_t
 334 Output_merge_data::Merge_data_hash::operator()(Merge_data_key k) const
 335 {
 336   const unsigned char* p = this->pomd_->constant(k);
 337   section_size_type entsize =
 338     convert_to_section_size_type(this->pomd_->entsize());
 339
 340   // Fowler/Noll/Vo (FNV) hash (type FNV-1a).
 341   if (sizeof(size_t) == 8)
 342     {
 343       size_t result = static_cast<size_t>(14695981039346656037ULL);
 344       for (section_size_type i = 0; i < entsize; ++i)
 345         {
 346           result &= (size_t) *p++;
 347           result *= 1099511628211ULL;
 348         }
 349       return result;
 350     }
 351   else
 352     {
 353       size_t result = 2166136261UL;
 354       for (section_size_type i = 0; i < entsize; ++i)
 355         {
 356           result ^= (size_t) *p++;
 357           result *= 16777619UL;
 358         }
 359       return result;
 360     }
 361 }
 362
 363 // Return whether one hash table key equals another.
 364
 365 bool
 366 Output_merge_data::Merge_data_eq::operator()(Merge_data_key k1,
 367                                              Merge_data_key k2) const
 368 {
 369   const unsigned char* p1 = this->pomd_->constant(k1);
 370   const unsigned char* p2 = this->pomd_->constant(k2);
 371   return memcmp(p1, p2, this->pomd_->entsize()) == 0;
 372 }
 373
 374 // Add a constant to the end of the section contents.
 375
 376 void
 377 Output_merge_data::add_constant(const unsigned char* p)
 378 {
 379   section_size_type entsize = convert_to_section_size_type(this->entsize());
 380   section_size_type addralign =
 381     convert_to_section_size_type(this->addralign());
 382   section_size_type addsize = std::max(entsize, addralign);
 383   if (this->len_ + addsize > this->alc_)
 384     {
 385       if (this->alc_ == 0)
 386         this->alc_ = 128 * addsize;
 387       else
 388         this->alc_ *= 2;
 389       this->p_ = static_cast<unsigned char*>(realloc(this->p_, this->alc_));
 390       if (this->p_ == NULL)
 391         gold_nomem();
 392     }
 393
 394   memcpy(this->p_ + this->len_, p, entsize);
 395   if (addsize > entsize)
 396     memset(this->p_ + this->len_ + entsize, 0, addsize - entsize);
 397   this->len_ += addsize;
 398 }
 399
 400 // Add the input section SHNDX in OBJECT to a merged output section
 401 // which holds fixed length constants.  Return whether we were able to
 402 // handle the section; if not, it will be linked as usual without
 403 // constant merging.
 404
 405 bool
 406 Output_merge_data::do_add_input_section(Relobj* object, unsigned int shndx)
 407 {
 408   section_size_type len;
 409   section_size_type uncompressed_size = 0;
 410   unsigned char* uncompressed_data = NULL;
 411   const unsigned char* p = object->section_contents(shndx, &len, false);
 412
 413   if (object->section_is_compressed(shndx, &uncompressed_size))
 414     {
 415       uncompressed_data = new unsigned char[uncompressed_size];
 416       if (!decompress_input_section(p, len, uncompressed_data,
 417                                     uncompressed_size))
 418         object->error(_("could not decompress section %s"),
 419                       object->section_name(shndx).c_str());
 420       p = uncompressed_data;
 421       len = uncompressed_size;
 422     }
 423
 424   section_size_type entsize = convert_to_section_size_type(this->entsize());
 425
 426   if (len % entsize != 0)
 427     {
 428       if (uncompressed_data != NULL)
 429         delete[] uncompressed_data;
 430       return false;
 431     }
 432
 433   this->input_count_ += len / entsize;
 434
 435   for (section_size_type i = 0; i < len; i += entsize, p += entsize)
 436     {
 437       // Add the constant to the section contents.  If we find that it
 438       // is already in the hash table, we will remove it again.
 439       Merge_data_key k = this->len_;
 440       this->add_constant(p);
 441
 442       std::pair<Merge_data_hashtable::iterator, bool> ins =
 443         this->hashtable_.insert(k);
 444
 445       if (!ins.second)
 446         {
 447           // Key was already present.  Remove the copy we just added.
 448           this->len_ -= entsize;
 449           k = *ins.first;
 450         }
 451
 452       // Record the offset of this constant in the output section.
 453       this->add_mapping(object, shndx, i, entsize, k);
 454     }
 455
 456   // For script processing, we keep the input sections.
 457   if (this->keeps_input_sections())
 458     record_input_section(object, shndx);
 459
 460   if (uncompressed_data != NULL)
 461     delete[] uncompressed_data;
 462
 463   return true;
 464 }
 465
 466 // Set the final data size in a merged output section with fixed size
 467 // constants.
 468
 469 void
 470 Output_merge_data::set_final_data_size()
 471 {
 472   // Release the memory we don't need.
 473   this->p_ = static_cast<unsigned char*>(realloc(this->p_, this->len_));
 474   // An Output_merge_data object may be empty and realloc is allowed
 475   // to return a NULL pointer in this case.  An Output_merge_data is empty
 476   // if all its input sections have sizes that are not multiples of entsize.
 477   gold_assert(this->p_ != NULL || this->len_ == 0);
 478   this->set_data_size(this->len_);
 479 }
 480
 481 // Write the data of a merged output section with fixed size constants
 482 // to the file.
 483
 484 void
 485 Output_merge_data::do_write(Output_file* of)
 486 {
 487   of->write(this->offset(), this->p_, this->len_);
 488 }
 489
 490 // Write the data to a buffer.
 491
 492 void
 493 Output_merge_data::do_write_to_buffer(unsigned char* buffer)
 494 {
 495   memcpy(buffer, this->p_, this->len_);
 496 }
 497
 498 // Print merge stats to stderr.
 499
 500 void
 501 Output_merge_data::do_print_merge_stats(const char* section_name)
 502 {
 503   fprintf(stderr,
 504           _("%s: %s merged constants size: %lu; input: %zu; output: %zu\n"),
 505           program_name, section_name,
 506           static_cast<unsigned long>(this->entsize()),
 507           this->input_count_, this->hashtable_.size());
 508 }
 509
 510 // Class Output_merge_string.
 511
 512 // Add an input section to a merged string section.
 513
 514 template<typename Char_type>
 515 bool
 516 Output_merge_string<Char_type>::do_add_input_section(Relobj* object,
 517                                                      unsigned int shndx)
 518 {
 519   section_size_type len;
 520   section_size_type uncompressed_size = 0;
 521   unsigned char* uncompressed_data = NULL;
 522   const unsigned char* pdata = object->section_contents(shndx, &len, false);
 523
 524   if (object->section_is_compressed(shndx, &uncompressed_size))
 525     {
 526       uncompressed_data = new unsigned char[uncompressed_size];
 527       if (!decompress_input_section(pdata, len, uncompressed_data,
 528                                     uncompressed_size))
 529         object->error(_("could not decompress section %s"),
 530                       object->section_name(shndx).c_str());
 531       pdata = uncompressed_data;
 532       len = uncompressed_size;
 533     }
 534
 535   const Char_type* p = reinterpret_cast<const Char_type*>(pdata);
 536   const Char_type* pend = p + len / sizeof(Char_type);
 537   const Char_type* pend0 = pend;
 538
 539   if (len % sizeof(Char_type) != 0)
 540     {
 541       object->error(_("mergeable string section length not multiple of "
 542                       "character size"));
 543       if (uncompressed_data != NULL)
 544         delete[] uncompressed_data;
 545       return false;
 546     }
 547
 548   if (pend[-1] != 0)
 549     {
 550       gold_warning(_("%s: last entry in mergeable string section '%s' "
 551                      "not null terminated"),
 552                    object->name().c_str(),
 553                    object->section_name(shndx).c_str());
 554       // Find the end of the last NULL-terminated string in the buffer.
 555       while (pend0 > p && pend0[-1] != 0)
 556         --pend0;
 557     }
 558
 559   Merged_strings_list* merged_strings_list =
 560       new Merged_strings_list(object, shndx);
 561   this->merged_strings_lists_.push_back(merged_strings_list);
 562   Merged_strings& merged_strings = merged_strings_list->merged_strings;
 563
 564   // Count the number of strings in the section and size the list.
 565   size_t count = 0;
 566   for (const Char_type* pt = p; pt < pend0; pt += string_length(pt) + 1)
 567     ++count;
 568   if (pend0 < pend)
 569     ++count;
 570   merged_strings.reserve(count + 1);
 571
 572   // The index I is in bytes, not characters.
 573   section_size_type i = 0;
 574   while (p < pend0)
 575     {
 576       size_t len = string_length(p);
 577
 578       Stringpool::Key key;
 579       this->stringpool_.add_with_length(p, len, true, &key);
 580
 581       merged_strings.push_back(Merged_string(i, key));
 582
 583       p += len + 1;
 584       i += (len + 1) * sizeof(Char_type);
 585     }
 586   if (p < pend)
 587     {
 588       size_t len = pend - p;
 589
 590       Stringpool::Key key;
 591       this->stringpool_.add_with_length(p, len, true, &key);
 592
 593       merged_strings.push_back(Merged_string(i, key));
 594
 595       i += (len + 1) * sizeof(Char_type);
 596     }
 597
 598   // Record the last offset in the input section so that we can
 599   // compute the length of the last string.
 600   merged_strings.push_back(Merged_string(i, 0));
 601
 602   this->input_count_ += count;
 603   this->input_size_ += len;
 604
 605   // For script processing, we keep the input sections.
 606   if (this->keeps_input_sections())
 607     record_input_section(object, shndx);
 608
 609   if (uncompressed_data != NULL)
 610     delete[] uncompressed_data;
 611
 612   return true;
 613 }
 614
 615 // Finalize the mappings from the input sections to the output
 616 // section, and return the final data size.
 617
 618 template<typename Char_type>
 619 section_size_type
 620 Output_merge_string<Char_type>::finalize_merged_data()
 621 {
 622   this->stringpool_.set_string_offsets();
 623
 624   for (typename Merged_strings_lists::const_iterator l =
 625          this->merged_strings_lists_.begin();
 626        l != this->merged_strings_lists_.end();
 627        ++l)
 628     {
 629       section_offset_type last_input_offset = 0;
 630       section_offset_type last_output_offset = 0;
 631       for (typename Merged_strings::const_iterator p =
 632              (*l)->merged_strings.begin();
 633            p != (*l)->merged_strings.end();
 634            ++p)
 635         {
 636           section_size_type length = p->offset - last_input_offset;
 637           if (length > 0)
 638             this->add_mapping((*l)->object, (*l)->shndx, last_input_offset,
 639                               length, last_output_offset);
 640           last_input_offset = p->offset;
 641           if (p->stringpool_key != 0)
 642             last_output_offset =
 643                 this->stringpool_.get_offset_from_key(p->stringpool_key);
 644         }
 645       delete *l;
 646     }
 647
 648   // Save some memory.  This also ensures that this function will work
 649   // if called twice, as may happen if Layout::set_segment_offsets
 650   // finds a better alignment.
 651   this->merged_strings_lists_.clear();
 652
 653   return this->stringpool_.get_strtab_size();
 654 }
 655
 656 template<typename Char_type>
 657 void
 658 Output_merge_string<Char_type>::set_final_data_size()
 659 {
 660   const off_t final_data_size = this->finalize_merged_data();
 661   this->set_data_size(final_data_size);
 662 }
 663
 664 // Write out a merged string section.
 665
 666 template<typename Char_type>
 667 void
 668 Output_merge_string<Char_type>::do_write(Output_file* of)
 669 {
 670   this->stringpool_.write(of, this->offset());
 671 }
 672
 673 // Write a merged string section to a buffer.
 674
 675 template<typename Char_type>
 676 void
 677 Output_merge_string<Char_type>::do_write_to_buffer(unsigned char* buffer)
 678 {
 679   this->stringpool_.write_to_buffer(buffer, this->data_size());
 680 }
 681
 682 // Return the name of the types of string to use with
 683 // do_print_merge_stats.
 684
 685 template<typename Char_type>
 686 const char*
 687 Output_merge_string<Char_type>::string_name()
 688 {
 689   gold_unreachable();
 690   return NULL;
 691 }
 692
 693 template<>
 694 const char*
 695 Output_merge_string<char>::string_name()
 696 {
 697   return "strings";
 698 }
 699
 700 template<>
 701 const char*
 702 Output_merge_string<uint16_t>::string_name()
 703 {
 704   return "16-bit strings";
 705 }
 706
 707 template<>
 708 const char*
 709 Output_merge_string<uint32_t>::string_name()
 710 {
 711   return "32-bit strings";
 712 }
 713
 714 // Print merge stats to stderr.
 715
 716 template<typename Char_type>
 717 void
 718 Output_merge_string<Char_type>::do_print_merge_stats(const char* section_name)
 719 {
 720   char buf[200];
 721   snprintf(buf, sizeof buf, "%s merged %s", section_name, this->string_name());
 722   fprintf(stderr, _("%s: %s input bytes: %zu\n"),
 723           program_name, buf, this->input_size_);
 724   fprintf(stderr, _("%s: %s input strings: %zu\n"),
 725           program_name, buf, this->input_count_);
 726   this->stringpool_.print_stats(buf);
 727 }
 728
 729 // Instantiate the templates we need.
 730
 731 template
 732 class Output_merge_string<char>;
 733
 734 template
 735 class Output_merge_string<uint16_t>;
 736
 737 template
 738 class Output_merge_string<uint32_t>;
 739
 740 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
 741 template
 742 void
 743 Object_merge_map::initialize_input_to_output_map<32>(
 744     unsigned int shndx,
 745     elfcpp::Elf_types<32>::Elf_Addr starting_address,
 746     Unordered_map<section_offset_type, elfcpp::Elf_types<32>::Elf_Addr>*);
 747 #endif
 748
 749 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
 750 template
 751 void
 752 Object_merge_map::initialize_input_to_output_map<64>(
 753     unsigned int shndx,
 754     elfcpp::Elf_types<64>::Elf_Addr starting_address,
 755     Unordered_map<section_offset_type, elfcpp::Elf_types<64>::Elf_Addr>*);
 756 #endif
 757
 758 } // End namespace gold.