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