gold/object.h

   1 // object.h -- support for an object file for linking in gold  -*- C++ -*-
   2
   3 #ifndef GOLD_OBJECT_H
   4 #define GOLD_OBJECT_H
   5
   6 #include <string>
   7 #include <vector>
   8
   9 #include "elfcpp.h"
  10 #include "elfcpp_file.h"
  11 #include "fileread.h"
  12 #include "target.h"
  13
  14 namespace gold
  15 {
  16
  17 class General_options;
  18 class Layout;
  19 class Output_section;
  20 class Output_file;
  21 class Dynobj;
  22
  23 template<typename Stringpool_char>
  24 class Stringpool_template;
  25
  26 // Data to pass from read_symbols() to add_symbols().
  27
  28 struct Read_symbols_data
  29 {
  30   // Section headers.
  31   File_view* section_headers;
  32   // Section names.
  33   File_view* section_names;
  34   // Size of section name data in bytes.
  35   off_t section_names_size;
  36   // Symbol data.
  37   File_view* symbols;
  38   // Size of symbol data in bytes.
  39   off_t symbols_size;
  40   // Symbol names.
  41   File_view* symbol_names;
  42   // Size of symbol name data in bytes.
  43   off_t symbol_names_size;
  44
  45   // Version information.  This is only used on dynamic objects.
  46   // Version symbol data (from SHT_GNU_versym section).
  47   File_view* versym;
  48   off_t versym_size;
  49   // Version definition data (from SHT_GNU_verdef section).
  50   File_view* verdef;
  51   off_t verdef_size;
  52   unsigned int verdef_info;
  53   // Needed version data  (from SHT_GNU_verneed section).
  54   File_view* verneed;
  55   off_t verneed_size;
  56   unsigned int verneed_info;
  57 };
  58
  59 // Data about a single relocation section.  This is read in
  60 // read_relocs and processed in scan_relocs.
  61
  62 struct Section_relocs
  63 {
  64   // Index of reloc section.
  65   unsigned int reloc_shndx;
  66   // Index of section that relocs apply to.
  67   unsigned int data_shndx;
  68   // Contents of reloc section.
  69   File_view* contents;
  70   // Reloc section type.
  71   unsigned int sh_type;
  72   // Number of reloc entries.
  73   size_t reloc_count;
  74 };
  75
  76 // Relocations in an object file.  This is read in read_relocs and
  77 // processed in scan_relocs.
  78
  79 struct Read_relocs_data
  80 {
  81   typedef std::vector<Section_relocs> Relocs_list;
  82   // The relocations.
  83   Relocs_list relocs;
  84   // The local symbols.
  85   File_view* local_symbols;
  86 };
  87
  88 // Object is an abstract base class which represents either a 32-bit
  89 // or a 64-bit input object.  This can be a regular object file
  90 // (ET_REL) or a shared object (ET_DYN).
  91
  92 class Object
  93 {
  94  public:
  95   // NAME is the name of the object as we would report it to the user
  96   // (e.g., libfoo.a(bar.o) if this is in an archive.  INPUT_FILE is
  97   // used to read the file.  OFFSET is the offset within the input
  98   // file--0 for a .o or .so file, something else for a .a file.
  99   Object(const std::string& name, Input_file* input_file, bool is_dynamic,
 100          off_t offset = 0)
 101     : name_(name), input_file_(input_file), offset_(offset), shnum_(-1U),
 102       is_dynamic_(is_dynamic), target_(NULL)
 103   { }
 104
 105   virtual ~Object()
 106   { }
 107
 108   // Return the name of the object as we would report it to the tuser.
 109   const std::string&
 110   name() const
 111   { return this->name_; }
 112
 113   // Return whether this is a dynamic object.
 114   bool
 115   is_dynamic() const
 116   { return this->is_dynamic_; }
 117
 118   // Return the target structure associated with this object.
 119   Target*
 120   target() const
 121   { return this->target_; }
 122
 123   // Lock the underlying file.
 124   void
 125   lock()
 126   { this->input_file_->file().lock(); }
 127
 128   // Unlock the underlying file.
 129   void
 130   unlock()
 131   { this->input_file_->file().unlock(); }
 132
 133   // Return whether the underlying file is locked.
 134   bool
 135   is_locked() const
 136   { return this->input_file_->file().is_locked(); }
 137
 138   // Return the sized target structure associated with this object.
 139   // This is like the target method but it returns a pointer of
 140   // appropriate checked type.
 141   template<int size, bool big_endian>
 142   Sized_target<size, big_endian>*
 143   sized_target(ACCEPT_SIZE_ENDIAN_ONLY);
 144
 145   // Get the number of sections.
 146   unsigned int
 147   shnum() const
 148   { return this->shnum_; }
 149
 150   // Return a view of the contents of a section.  Set *PLEN to the
 151   // size.
 152   const unsigned char*
 153   section_contents(unsigned int shndx, off_t* plen);
 154
 155   // Return the name of a section given a section index.  This is only
 156   // used for error messages.
 157   std::string
 158   section_name(unsigned int shndx)
 159   { return this->do_section_name(shndx); }
 160
 161   // Return the section flags given a section index.
 162   uint64_t
 163   section_flags(unsigned int shndx)
 164   { return this->do_section_flags(shndx); }
 165
 166   // Read the symbol information.
 167   void
 168   read_symbols(Read_symbols_data* sd)
 169   { return this->do_read_symbols(sd); }
 170
 171   // Pass sections which should be included in the link to the Layout
 172   // object, and record where the sections go in the output file.
 173   void
 174   layout(const General_options& options, Symbol_table* symtab,
 175          Layout* layout, Read_symbols_data* sd)
 176   { this->do_layout(options, symtab, layout, sd); }
 177
 178   // Add symbol information to the global symbol table.
 179   void
 180   add_symbols(Symbol_table* symtab, Read_symbols_data* sd)
 181   { this->do_add_symbols(symtab, sd); }
 182
 183   // Functions and types for the elfcpp::Elf_file interface.  This
 184   // permit us to use Object as the File template parameter for
 185   // elfcpp::Elf_file.
 186
 187   // The View class is returned by view.  It must support a single
 188   // method, data().  This is trivial, because get_view does what we
 189   // need.
 190   class View
 191   {
 192    public:
 193     View(const unsigned char* p)
 194       : p_(p)
 195     { }
 196
 197     const unsigned char*
 198     data() const
 199     { return this->p_; }
 200
 201    private:
 202     const unsigned char* p_;
 203   };
 204
 205   // Return a View.
 206   View
 207   view(off_t file_offset, off_t data_size)
 208   { return View(this->get_view(file_offset, data_size)); }
 209
 210   // Report an error.
 211   void
 212   error(const char* format, ...) ATTRIBUTE_PRINTF_2;
 213
 214   // A location in the file.
 215   struct Location
 216   {
 217     off_t file_offset;
 218     off_t data_size;
 219
 220     Location(off_t fo, off_t ds)
 221       : file_offset(fo), data_size(ds)
 222     { }
 223   };
 224
 225   // Get a View given a Location.
 226   View view(Location loc)
 227   { return View(this->get_view(loc.file_offset, loc.data_size)); }
 228
 229  protected:
 230   // Read the symbols--implemented by child class.
 231   virtual void
 232   do_read_symbols(Read_symbols_data*) = 0;
 233
 234   // Lay out sections--implemented by child class.
 235   virtual void
 236   do_layout(const General_options&, Symbol_table*, Layout*,
 237             Read_symbols_data*) = 0;
 238
 239   // Add symbol information to the global symbol table--implemented by
 240   // child class.
 241   virtual void
 242   do_add_symbols(Symbol_table*, Read_symbols_data*) = 0;
 243
 244   // Return the location of the contents of a section.  Implemented by
 245   // child class.
 246   virtual Location
 247   do_section_contents(unsigned int shndx) = 0;
 248
 249   // Get the name of a section--implemented by child class.
 250   virtual std::string
 251   do_section_name(unsigned int shndx) = 0;
 252
 253   // Get section flags--implemented by child class.
 254   virtual uint64_t
 255   do_section_flags(unsigned int shndx) = 0;
 256
 257   // Get the file.
 258   Input_file*
 259   input_file() const
 260   { return this->input_file_; }
 261
 262   // Get the offset into the file.
 263   off_t
 264   offset() const
 265   { return this->offset_; }
 266
 267   // Get a view into the underlying file.
 268   const unsigned char*
 269   get_view(off_t start, off_t size)
 270   { return this->input_file_->file().get_view(start + this->offset_, size); }
 271
 272   // Get a lasting view into the underlying file.
 273   File_view*
 274   get_lasting_view(off_t start, off_t size)
 275   {
 276     return this->input_file_->file().get_lasting_view(start + this->offset_,
 277                                                       size);
 278   }
 279
 280   // Read data from the underlying file.
 281   void
 282   read(off_t start, off_t size, void* p)
 283   { this->input_file_->file().read(start + this->offset_, size, p); }
 284
 285   // Set the target.
 286   void
 287   set_target(int machine, int size, bool big_endian, int osabi,
 288              int abiversion);
 289
 290   // Set the number of sections.
 291   void
 292   set_shnum(int shnum)
 293   { this->shnum_ = shnum; }
 294
 295   // Functions used by both Sized_relobj and Sized_dynobj.
 296
 297   // Read the section data into a Read_symbols_data object.
 298   template<int size, bool big_endian>
 299   void
 300   read_section_data(elfcpp::Elf_file<size, big_endian, Object>*,
 301                     Read_symbols_data*);
 302
 303   // If NAME is the name of a special .gnu.warning section, arrange
 304   // for the warning to be issued.  SHNDX is the section index.
 305   // Return whether it is a warning section.
 306   bool
 307   handle_gnu_warning_section(const char* name, unsigned int shndx,
 308                              Symbol_table*);
 309
 310  private:
 311   // This class may not be copied.
 312   Object(const Object&);
 313   Object& operator=(const Object&);
 314
 315   // Name of object as printed to user.
 316   std::string name_;
 317   // For reading the file.
 318   Input_file* input_file_;
 319   // Offset within the file--0 for an object file, non-0 for an
 320   // archive.
 321   off_t offset_;
 322   // Number of input sections.
 323   unsigned int shnum_;
 324   // Whether this is a dynamic object.
 325   bool is_dynamic_;
 326   // Target functions--may be NULL if the target is not known.
 327   Target* target_;
 328 };
 329
 330 // Implement sized_target inline for efficiency.  This approach breaks
 331 // static type checking, but is made safe using asserts.
 332
 333 template<int size, bool big_endian>
 334 inline Sized_target<size, big_endian>*
 335 Object::sized_target(ACCEPT_SIZE_ENDIAN_ONLY)
 336 {
 337   gold_assert(this->target_->get_size() == size);
 338   gold_assert(this->target_->is_big_endian() ? big_endian : !big_endian);
 339   return static_cast<Sized_target<size, big_endian>*>(this->target_);
 340 }
 341
 342 // A regular object (ET_REL).  This is an abstract base class itself.
 343 // The implementation is the template class Sized_relobj.
 344
 345 class Relobj : public Object
 346 {
 347  public:
 348   Relobj(const std::string& name, Input_file* input_file, off_t offset = 0)
 349     : Object(name, input_file, false, offset)
 350   { }
 351
 352   // Read the relocs.
 353   void
 354   read_relocs(Read_relocs_data* rd)
 355   { return this->do_read_relocs(rd); }
 356
 357   // Scan the relocs and adjust the symbol table.
 358   void
 359   scan_relocs(const General_options& options, Symbol_table* symtab,
 360               Layout* layout, Read_relocs_data* rd)
 361   { return this->do_scan_relocs(options, symtab, layout, rd); }
 362
 363   // Initial local symbol processing: set the offset where local
 364   // symbol information will be stored; add local symbol names to
 365   // *POOL; return the new local symbol index.
 366   unsigned int
 367   finalize_local_symbols(unsigned int index, off_t off,
 368                          Stringpool_template<char>* pool)
 369   { return this->do_finalize_local_symbols(index, off, pool); }
 370
 371   // Relocate the input sections and write out the local symbols.
 372   void
 373   relocate(const General_options& options, const Symbol_table* symtab,
 374            const Layout* layout, Output_file* of)
 375   { return this->do_relocate(options, symtab, layout, of); }
 376
 377   // Return whether an input section is being included in the link.
 378   bool
 379   is_section_included(unsigned int shndx) const
 380   {
 381     gold_assert(shndx < this->map_to_output_.size());
 382     return this->map_to_output_[shndx].output_section != NULL;
 383   }
 384
 385   // Given a section index, return the corresponding Output_section
 386   // (which will be NULL if the section is not included in the link)
 387   // and set *POFF to the offset within that section.
 388   inline Output_section*
 389   output_section(unsigned int shndx, off_t* poff) const;
 390
 391   // Set the offset of an input section within its output section.
 392   void
 393   set_section_offset(unsigned int shndx, off_t off)
 394   {
 395     gold_assert(shndx < this->map_to_output_.size());
 396     this->map_to_output_[shndx].offset = off;
 397   }
 398
 399  protected:
 400   // What we need to know to map an input section to an output
 401   // section.  We keep an array of these, one for each input section,
 402   // indexed by the input section number.
 403   struct Map_to_output
 404   {
 405     // The output section.  This is NULL if the input section is to be
 406     // discarded.
 407     Output_section* output_section;
 408     // The offset within the output section.  This is -1 if the
 409     // section requires special handling.
 410     off_t offset;
 411   };
 412
 413   // Read the relocs--implemented by child class.
 414   virtual void
 415   do_read_relocs(Read_relocs_data*) = 0;
 416
 417   // Scan the relocs--implemented by child class.
 418   virtual void
 419   do_scan_relocs(const General_options&, Symbol_table*, Layout*,
 420                  Read_relocs_data*) = 0;
 421
 422   // Finalize local symbols--implemented by child class.
 423   virtual unsigned int
 424   do_finalize_local_symbols(unsigned int, off_t,
 425                             Stringpool_template<char>*) = 0;
 426
 427   // Relocate the input sections and write out the local
 428   // symbols--implemented by child class.
 429   virtual void
 430   do_relocate(const General_options& options, const Symbol_table* symtab,
 431               const Layout*, Output_file* of) = 0;
 432
 433   // Return the vector mapping input sections to output sections.
 434   std::vector<Map_to_output>&
 435   map_to_output()
 436   { return this->map_to_output_; }
 437
 438   const std::vector<Map_to_output>&
 439   map_to_output() const
 440   { return this->map_to_output_; }
 441
 442  private:
 443   // Mapping from input sections to output section.
 444   std::vector<Map_to_output> map_to_output_;
 445 };
 446
 447 // Implement Object::output_section inline for efficiency.
 448 inline Output_section*
 449 Relobj::output_section(unsigned int shndx, off_t* poff) const
 450 {
 451   gold_assert(shndx < this->map_to_output_.size());
 452   const Map_to_output& mo(this->map_to_output_[shndx]);
 453   *poff = mo.offset;
 454   return mo.output_section;
 455 }
 456
 457 // This POD class is holds the value of a symbol.  This is used for
 458 // local symbols, and for all symbols during relocation processing.
 459 // In order to process relocs we need to be able to handle SHF_MERGE
 460 // sections correctly.
 461
 462 template<int size>
 463 class Symbol_value
 464 {
 465  public:
 466   typedef typename elfcpp::Elf_types<size>::Elf_Addr Value;
 467
 468   Symbol_value()
 469     : output_symtab_index_(0), input_shndx_(0), needs_output_address_(false),
 470       value_(0)
 471   { }
 472
 473   // Get the value of this symbol.  OBJECT is the object in which this
 474   // symbol is defined, and ADDEND is an addend to add to the value.
 475   template<bool big_endian>
 476   Value
 477   value(const Sized_relobj<size, big_endian>* object, Value addend) const
 478   {
 479     if (!this->needs_output_address_)
 480       return this->value_ + addend;
 481     return object->local_value(this->input_shndx_, this->value_, addend);
 482   }
 483
 484   // Set the value of this symbol in the output symbol table.
 485   void
 486   set_output_value(Value value)
 487   {
 488     this->value_ = value;
 489     this->needs_output_address_ = false;
 490   }
 491
 492   // If this symbol is mapped to an output section which requires
 493   // special handling to determine the output value, we store the
 494   // value of the symbol in the input file.  This is used for
 495   // SHF_MERGE sections.
 496   void
 497   set_input_value(Value value)
 498   {
 499     this->value_ = value;
 500     this->needs_output_address_ = true;
 501   }
 502
 503   // Return whether this symbol should go into the output symbol
 504   // table.
 505   bool
 506   needs_output_symtab_entry() const
 507   {
 508     gold_assert(this->output_symtab_index_ != 0);
 509     return this->output_symtab_index_ != -1U;
 510   }
 511
 512   // Return the index in the output symbol table.
 513   unsigned int
 514   output_symtab_index() const
 515   {
 516     gold_assert(this->output_symtab_index_ != 0);
 517     return this->output_symtab_index_;
 518   }
 519
 520   // Set the index in the output symbol table.
 521   void
 522   set_output_symtab_index(unsigned int i)
 523   {
 524     gold_assert(this->output_symtab_index_ == 0);
 525     this->output_symtab_index_ = i;
 526   }
 527
 528   // Record that this symbol should not go into the output symbol
 529   // table.
 530   void
 531   set_no_output_symtab_entry()
 532   {
 533     gold_assert(this->output_symtab_index_ == 0);
 534     this->output_symtab_index_ = -1U;
 535   }
 536
 537   // Set the index of the input section in the input file.
 538   void
 539   set_input_shndx(unsigned int i)
 540   { this->input_shndx_ = i; }
 541
 542  private:
 543   // The index of this local symbol in the output symbol table.  This
 544   // will be -1 if the symbol should not go into the symbol table.
 545   unsigned int output_symtab_index_;
 546   // The section index in the input file in which this symbol is
 547   // defined.
 548   unsigned int input_shndx_ : 31;
 549   // Whether getting the value of this symbol requires calling an
 550   // Output_section method.  For example, this will be true of a
 551   // STT_SECTION symbol in a SHF_MERGE section.
 552   bool needs_output_address_ : 1;
 553   // The value of the symbol.  If !needs_output_address_, this is the
 554   // value in the output file.  If needs_output_address_, this is the
 555   // value in the input file.
 556   Value value_;
 557 };
 558
 559 // A regular object file.  This is size and endian specific.
 560
 561 template<int size, bool big_endian>
 562 class Sized_relobj : public Relobj
 563 {
 564  public:
 565   typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
 566   typedef std::vector<Symbol_value<size> > Local_values;
 567
 568   Sized_relobj(const std::string& name, Input_file* input_file, off_t offset,
 569                const typename elfcpp::Ehdr<size, big_endian>&);
 570
 571   ~Sized_relobj();
 572
 573   // Set up the object file based on the ELF header.
 574   void
 575   setup(const typename elfcpp::Ehdr<size, big_endian>&);
 576
 577   // Return the index of local symbol SYM in the ordinary symbol
 578   // table.  A value of -1U means that the symbol is not being output.
 579   unsigned int
 580   symtab_index(unsigned int sym) const
 581   {
 582     gold_assert(sym < this->local_values_.size());
 583     return this->local_values_[sym].output_symtab_index();
 584   }
 585
 586   // Read the symbols.
 587   void
 588   do_read_symbols(Read_symbols_data*);
 589
 590   // Lay out the input sections.
 591   void
 592   do_layout(const General_options&, Symbol_table*, Layout*,
 593             Read_symbols_data*);
 594
 595   // Add the symbols to the symbol table.
 596   void
 597   do_add_symbols(Symbol_table*, Read_symbols_data*);
 598
 599   // Read the relocs.
 600   void
 601   do_read_relocs(Read_relocs_data*);
 602
 603   // Scan the relocs and adjust the symbol table.
 604   void
 605   do_scan_relocs(const General_options&, Symbol_table*, Layout*,
 606                  Read_relocs_data*);
 607
 608   // Finalize the local symbols.
 609   unsigned int
 610   do_finalize_local_symbols(unsigned int, off_t,
 611                             Stringpool_template<char>*);
 612
 613   // Relocate the input sections and write out the local symbols.
 614   void
 615   do_relocate(const General_options& options, const Symbol_table* symtab,
 616               const Layout*, Output_file* of);
 617
 618   // Get the name of a section.
 619   std::string
 620   do_section_name(unsigned int shndx)
 621   { return this->elf_file_.section_name(shndx); }
 622
 623   // Return the location of the contents of a section.
 624   Object::Location
 625   do_section_contents(unsigned int shndx)
 626   { return this->elf_file_.section_contents(shndx); }
 627
 628   // Return section flags.
 629   uint64_t
 630   do_section_flags(unsigned int shndx)
 631   { return this->elf_file_.section_flags(shndx); }
 632
 633   // Return the appropriate Sized_target structure.
 634   Sized_target<size, big_endian>*
 635   sized_target()
 636   {
 637     return this->Object::sized_target
 638       SELECT_SIZE_ENDIAN_NAME(size, big_endian) (
 639           SELECT_SIZE_ENDIAN_ONLY(size, big_endian));
 640   }
 641
 642   // Return the value of a local symbol define in input section SHNDX,
 643   // with value VALUE, adding addend ADDEND.  This handles SHF_MERGE
 644   // sections.
 645   Address
 646   local_value(unsigned int shndx, Address value, Address addend) const;
 647
 648  private:
 649   // For convenience.
 650   typedef Sized_relobj<size, big_endian> This;
 651   static const int ehdr_size = elfcpp::Elf_sizes<size>::ehdr_size;
 652   static const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size;
 653   static const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
 654   typedef elfcpp::Shdr<size, big_endian> Shdr;
 655
 656   // Find the SHT_SYMTAB section, given the section headers.
 657   void
 658   find_symtab(const unsigned char* pshdrs);
 659
 660   // Whether to include a section group in the link.
 661   bool
 662   include_section_group(Layout*, unsigned int,
 663                         const elfcpp::Shdr<size, big_endian>&,
 664                         std::vector<bool>*);
 665
 666   // Whether to include a linkonce section in the link.
 667   bool
 668   include_linkonce_section(Layout*, const char*,
 669                            const elfcpp::Shdr<size, big_endian>&);
 670
 671   // Views and sizes when relocating.
 672   struct View_size
 673   {
 674     unsigned char* view;
 675     typename elfcpp::Elf_types<size>::Elf_Addr address;
 676     off_t offset;
 677     off_t view_size;
 678   };
 679
 680   typedef std::vector<View_size> Views;
 681
 682   // Write section data to the output file.  Record the views and
 683   // sizes in VIEWS for use when relocating.
 684   void
 685   write_sections(const unsigned char* pshdrs, Output_file*, Views*);
 686
 687   // Relocate the sections in the output file.
 688   void
 689   relocate_sections(const General_options& options, const Symbol_table*,
 690                     const Layout*, const unsigned char* pshdrs, Views*);
 691
 692   // Write out the local symbols.
 693   void
 694   write_local_symbols(Output_file*,
 695                       const Stringpool_template<char>*);
 696
 697   // General access to the ELF file.
 698   elfcpp::Elf_file<size, big_endian, Object> elf_file_;
 699   // Index of SHT_SYMTAB section.
 700   unsigned int symtab_shndx_;
 701   // The number of local symbols.
 702   unsigned int local_symbol_count_;
 703   // The number of local symbols which go into the output file.
 704   unsigned int output_local_symbol_count_;
 705   // The entries in the symbol table for the external symbols.
 706   Symbol** symbols_;
 707   // File offset for local symbols.
 708   off_t local_symbol_offset_;
 709   // Values of local symbols.
 710   Local_values local_values_;
 711 };
 712
 713 // A class to manage the list of all objects.
 714
 715 class Input_objects
 716 {
 717  public:
 718   Input_objects()
 719     : relobj_list_(), dynobj_list_(), target_(NULL), sonames_()
 720   { }
 721
 722   // The type of the list of input relocateable objects.
 723   typedef std::vector<Relobj*> Relobj_list;
 724   typedef Relobj_list::const_iterator Relobj_iterator;
 725
 726   // The type of the list of input dynamic objects.
 727   typedef std::vector<Dynobj*> Dynobj_list;
 728   typedef Dynobj_list::const_iterator Dynobj_iterator;
 729
 730   // Add an object to the list.  Return true if all is well, or false
 731   // if this object should be ignored.
 732   bool
 733   add_object(Object*);
 734
 735   // Get the target we should use for the output file.
 736   Target*
 737   target() const
 738   { return this->target_; }
 739
 740   // Iterate over all regular objects.
 741
 742   Relobj_iterator
 743   relobj_begin() const
 744   { return this->relobj_list_.begin(); }
 745
 746   Relobj_iterator
 747   relobj_end() const
 748   { return this->relobj_list_.end(); }
 749
 750   // Iterate over all dynamic objects.
 751
 752   Dynobj_iterator
 753   dynobj_begin() const
 754   { return this->dynobj_list_.begin(); }
 755
 756   Dynobj_iterator
 757   dynobj_end() const
 758   { return this->dynobj_list_.end(); }
 759
 760   // Return whether we have seen any dynamic objects.
 761   bool
 762   any_dynamic() const
 763   { return !this->dynobj_list_.empty(); }
 764
 765  private:
 766   Input_objects(const Input_objects&);
 767   Input_objects& operator=(const Input_objects&);
 768
 769   // The list of ordinary objects included in the link.
 770   Relobj_list relobj_list_;
 771   // The list of dynamic objects included in the link.
 772   Dynobj_list dynobj_list_;
 773   // The target.
 774   Target* target_;
 775   // SONAMEs that we have seen.
 776   Unordered_set<std::string> sonames_;
 777 };
 778
 779 // Some of the information we pass to the relocation routines.  We
 780 // group this together to avoid passing a dozen different arguments.
 781
 782 template<int size, bool big_endian>
 783 struct Relocate_info
 784 {
 785   // Command line options.
 786   const General_options* options;
 787   // Symbol table.
 788   const Symbol_table* symtab;
 789   // Layout.
 790   const Layout* layout;
 791   // Object being relocated.
 792   Sized_relobj<size, big_endian>* object;
 793   // Number of local symbols.
 794   unsigned int local_symbol_count;
 795   // Values of local symbols.
 796   const typename Sized_relobj<size, big_endian>::Local_values* local_values;
 797   // Global symbols.
 798   const Symbol* const * symbols;
 799   // Section index of relocation section.
 800   unsigned int reloc_shndx;
 801   // Section index of section being relocated.
 802   unsigned int data_shndx;
 803
 804   // Return a string showing the location of a relocation.  This is
 805   // only used for error messages.
 806   std::string
 807   location(size_t relnum, off_t reloffset) const;
 808 };
 809
 810 // Return an Object appropriate for the input file.  P is BYTES long,
 811 // and holds the ELF header.
 812
 813 extern Object*
 814 make_elf_object(const std::string& name, Input_file*,
 815                 off_t offset, const unsigned char* p,
 816                 off_t bytes);
 817
 818 } // end namespace gold
 819
 820 #endif // !defined(GOLD_OBJECT_H)