gold/reloc.h

   1 // reloc.h -- relocate input files for gold   -*- C++ -*-
   2
   3 // Copyright 2006, 2007 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 #ifndef GOLD_RELOC_H
  24 #define GOLD_RELOC_H
  25
  26 #include <byteswap.h>
  27
  28 #include "workqueue.h"
  29
  30 namespace gold
  31 {
  32
  33 class General_options;
  34 class Relobj;
  35 class Read_relocs_data;
  36 class Symbol;
  37 class Layout;
  38
  39 template<int size>
  40 class Sized_symbol;
  41
  42 template<int size, bool big_endian>
  43 class Sized_relobj;
  44
  45 template<int size>
  46 class Symbol_value;
  47
  48 template<int sh_type, bool dynamic, int size, bool big_endian>
  49 class Output_data_reloc;
  50
  51 // A class to read the relocations for an object file, and then queue
  52 // up a task to see if they require any GOT/PLT/COPY relocations in
  53 // the symbol table.
  54
  55 class Read_relocs : public Task
  56 {
  57  public:
  58   // SYMTAB_LOCK is used to lock the symbol table.  BLOCKER should be
  59   // unblocked when the Scan_relocs task completes.
  60   Read_relocs(const General_options& options, Symbol_table* symtab,
  61               Layout* layout, Relobj* object, Task_token* symtab_lock,
  62               Task_token* blocker)
  63     : options_(options), symtab_(symtab), layout_(layout), object_(object),
  64       symtab_lock_(symtab_lock), blocker_(blocker)
  65   { }
  66
  67   // The standard Task methods.
  68
  69   Is_runnable_type
  70   is_runnable(Workqueue*);
  71
  72   Task_locker*
  73   locks(Workqueue*);
  74
  75   void
  76   run(Workqueue*);
  77
  78  private:
  79   const General_options& options_;
  80   Symbol_table* symtab_;
  81   Layout* layout_;
  82   Relobj* object_;
  83   Task_token* symtab_lock_;
  84   Task_token* blocker_;
  85 };
  86
  87 // Scan the relocations for an object to see if they require any
  88 // GOT/PLT/COPY relocations.
  89
  90 class Scan_relocs : public Task
  91 {
  92  public:
  93   // SYMTAB_LOCK is used to lock the symbol table.  BLOCKER should be
  94   // unblocked when the task completes.
  95   Scan_relocs(const General_options& options, Symbol_table* symtab,
  96               Layout* layout, Relobj* object, Read_relocs_data* rd,
  97               Task_token* symtab_lock, Task_token* blocker)
  98     : options_(options), symtab_(symtab), layout_(layout), object_(object),
  99       rd_(rd), symtab_lock_(symtab_lock), blocker_(blocker)
 100   { }
 101
 102   // The standard Task methods.
 103
 104   Is_runnable_type
 105   is_runnable(Workqueue*);
 106
 107   Task_locker*
 108   locks(Workqueue*);
 109
 110   void
 111   run(Workqueue*);
 112
 113  private:
 114   class Scan_relocs_locker;
 115
 116   const General_options& options_;
 117   Symbol_table* symtab_;
 118   Layout* layout_;
 119   Relobj* object_;
 120   Read_relocs_data* rd_;
 121   Task_token* symtab_lock_;
 122   Task_token* blocker_;
 123 };
 124
 125 // A class to perform all the relocations for an object file.
 126
 127 class Relocate_task : public Task
 128 {
 129  public:
 130   Relocate_task(const General_options& options, const Symbol_table* symtab,
 131                 const Layout* layout, Relobj* object, Output_file* of,
 132                 Task_token* final_blocker)
 133     : options_(options), symtab_(symtab), layout_(layout), object_(object),
 134       of_(of), final_blocker_(final_blocker)
 135   { }
 136
 137   // The standard Task methods.
 138
 139   Is_runnable_type
 140   is_runnable(Workqueue*);
 141
 142   Task_locker*
 143   locks(Workqueue*);
 144
 145   void
 146   run(Workqueue*);
 147
 148  private:
 149   class Relocate_locker;
 150
 151   const General_options& options_;
 152   const Symbol_table* symtab_;
 153   const Layout* layout_;
 154   Relobj* object_;
 155   Output_file* of_;
 156   Task_token* final_blocker_;
 157 };
 158
 159 // Standard relocation routines which are used on many targets.  Here
 160 // SIZE and BIG_ENDIAN refer to the target, not the relocation type.
 161
 162 template<int size, bool big_endian>
 163 class Relocate_functions
 164 {
 165 private:
 166   // Do a simple relocation with the addend in the section contents.
 167   // VALSIZE is the size of the value.
 168   template<int valsize>
 169   static inline void
 170   rel(unsigned char* view,
 171       typename elfcpp::Swap<valsize, big_endian>::Valtype value)
 172   {
 173     typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
 174     Valtype* wv = reinterpret_cast<Valtype*>(view);
 175     Valtype x = elfcpp::Swap<valsize, big_endian>::readval(wv);
 176     elfcpp::Swap<valsize, big_endian>::writeval(wv, x + value);
 177   }
 178
 179   // Do a simple relocation using a Symbol_value with the addend in
 180   // the section contents.  VALSIZE is the size of the value to
 181   // relocate.
 182   template<int valsize>
 183   static inline void
 184   rel(unsigned char* view,
 185       const Sized_relobj<size, big_endian>* object,
 186       const Symbol_value<size>* psymval)
 187   {
 188     typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
 189     Valtype* wv = reinterpret_cast<Valtype*>(view);
 190     Valtype x = elfcpp::Swap<valsize, big_endian>::readval(wv);
 191     x = psymval->value(object, x);
 192     elfcpp::Swap<valsize, big_endian>::writeval(wv, x);
 193   }
 194
 195   // Do a simple relocation with the addend in the relocation.
 196   // VALSIZE is the size of the value.
 197   template<int valsize>
 198   static inline void
 199   rela(unsigned char* view,
 200        typename elfcpp::Swap<valsize, big_endian>::Valtype value,
 201        typename elfcpp::Swap<valsize, big_endian>::Valtype addend)
 202   {
 203     typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
 204     Valtype* wv = reinterpret_cast<Valtype*>(view);
 205     elfcpp::Swap<valsize, big_endian>::writeval(wv, value + addend);
 206   }
 207
 208   // Do a simple relocation using a symbol value with the addend in
 209   // the relocation.  VALSIZE is the size of the value.
 210   template<int valsize>
 211   static inline void
 212   rela(unsigned char* view,
 213        const Sized_relobj<size, big_endian>* object,
 214        const Symbol_value<size>* psymval,
 215        typename elfcpp::Swap<valsize, big_endian>::Valtype addend)
 216   {
 217     typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
 218     Valtype* wv = reinterpret_cast<Valtype*>(view);
 219     Valtype x = psymval->value(object, addend);
 220     elfcpp::Swap<valsize, big_endian>::writeval(wv, x);
 221   }
 222
 223   // Like rel(), but sign-extends the value to SIZE.
 224   template<int valsize>
 225   static inline void
 226   signedrel(unsigned char* view,
 227             const Sized_relobj<size, big_endian>* object,
 228             const Symbol_value<size>* psymval)
 229   {
 230     typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
 231     typedef typename elfcpp::Swap<valsize, big_endian>::Signed_valtype
 232       Signed_valtype;
 233     typedef typename elfcpp::Swap<size, big_endian>::Valtype Sizetype;
 234     typedef typename elfcpp::Swap<size, big_endian>::Signed_valtype
 235       Signed_sizetype;
 236     Valtype* wv = reinterpret_cast<Valtype*>(view);
 237     Valtype x = elfcpp::Swap<valsize, big_endian>::readval(wv);
 238
 239     // Sign extend the value.
 240     Signed_valtype signed_x = static_cast<Signed_valtype>(x);
 241     Signed_sizetype signed_extended_x = static_cast<Signed_sizetype>(signed_x);
 242     Sizetype unsigned_extended_x = static_cast<Sizetype>(signed_extended_x);
 243
 244     x = psymval->value(object, unsigned_extended_x);
 245     elfcpp::Swap<valsize, big_endian>::writeval(wv, x);
 246   }
 247
 248   // Do a simple PC relative relocation with the addend in the section
 249   // contents.  VALSIZE is the size of the value.
 250   template<int valsize>
 251   static inline void
 252   pcrel(unsigned char* view,
 253         typename elfcpp::Swap<valsize, big_endian>::Valtype value,
 254         typename elfcpp::Elf_types<size>::Elf_Addr address)
 255   {
 256     typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
 257     Valtype* wv = reinterpret_cast<Valtype*>(view);
 258     Valtype x = elfcpp::Swap<valsize, big_endian>::readval(wv);
 259     elfcpp::Swap<valsize, big_endian>::writeval(wv, x + value - address);
 260   }
 261
 262   // Do a simple PC relative relocation with a Symbol_value with the
 263   // addend in the section contents.  VALSIZE is the size of the
 264   // value.
 265   template<int valsize>
 266   static inline void
 267   pcrel(unsigned char* view,
 268         const Sized_relobj<size, big_endian>* object,
 269         const Symbol_value<size>* psymval,
 270         typename elfcpp::Elf_types<size>::Elf_Addr address)
 271   {
 272     typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
 273     Valtype* wv = reinterpret_cast<Valtype*>(view);
 274     Valtype x = elfcpp::Swap<valsize, big_endian>::readval(wv);
 275     x = psymval->value(object, x);
 276     elfcpp::Swap<valsize, big_endian>::writeval(wv, x - address);
 277   }
 278
 279   // Do a simple PC relative relocation with the addend in the
 280   // relocation.  VALSIZE is the size of the value.
 281   template<int valsize>
 282   static inline void
 283   pcrela(unsigned char* view,
 284          typename elfcpp::Swap<valsize, big_endian>::Valtype value,
 285          typename elfcpp::Swap<valsize, big_endian>::Valtype addend,
 286          typename elfcpp::Elf_types<size>::Elf_Addr address)
 287   {
 288     typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
 289     Valtype* wv = reinterpret_cast<Valtype*>(view);
 290     elfcpp::Swap<valsize, big_endian>::writeval(wv, value + addend - address);
 291   }
 292
 293   // Do a simple PC relative relocation with a Symbol_value with the
 294   // addend in the relocation.  VALSIZE is the size of the value.
 295   template<int valsize>
 296   static inline void
 297   pcrela(unsigned char* view,
 298          const Sized_relobj<size, big_endian>* object,
 299          const Symbol_value<size>* psymval,
 300          typename elfcpp::Swap<valsize, big_endian>::Valtype addend,
 301          typename elfcpp::Elf_types<size>::Elf_Addr address)
 302   {
 303     typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
 304     Valtype* wv = reinterpret_cast<Valtype*>(view);
 305     Valtype x = psymval->value(object, addend);
 306     elfcpp::Swap<valsize, big_endian>::writeval(wv, x - address);
 307   }
 308
 309   typedef Relocate_functions<size, big_endian> This;
 310
 311 public:
 312   // Do a simple 8-bit REL relocation with the addend in the section
 313   // contents.
 314   static inline void
 315   rel8(unsigned char* view, unsigned char value)
 316   { This::template rel<8>(view, value); }
 317
 318   static inline void
 319   rel8(unsigned char* view,
 320        const Sized_relobj<size, big_endian>* object,
 321        const Symbol_value<size>* psymval)
 322   { This::template rel<8>(view, object, psymval); }
 323
 324   // Do an 8-bit RELA relocation with the addend in the relocation.
 325   static inline void
 326   rela8(unsigned char* view, unsigned char value, unsigned char addend)
 327   { This::template rela<8>(view, value, addend); }
 328
 329   static inline void
 330   rela8(unsigned char* view,
 331         const Sized_relobj<size, big_endian>* object,
 332         const Symbol_value<size>* psymval,
 333         unsigned char addend)
 334   { This::template rela<8>(view, object, psymval, addend); }
 335
 336   // Do an 8-bit REL relocation, sign extending the addend to SIZE.
 337   static inline void
 338   rel8s(unsigned char* view,
 339          const Sized_relobj<size, big_endian>* object,
 340          const Symbol_value<size>* psymval)
 341   { This::template signedrel<8>(view, object, psymval); }
 342
 343   // Do a simple 8-bit PC relative relocation with the addend in the
 344   // section contents.
 345   static inline void
 346   pcrel8(unsigned char* view, unsigned char value,
 347          typename elfcpp::Elf_types<size>::Elf_Addr address)
 348   { This::template pcrel<8>(view, value, address); }
 349
 350   static inline void
 351   pcrel8(unsigned char* view,
 352          const Sized_relobj<size, big_endian>* object,
 353          const Symbol_value<size>* psymval,
 354          typename elfcpp::Elf_types<size>::Elf_Addr address)
 355   { This::template pcrel<8>(view, object, psymval, address); }
 356
 357   // Do a simple 8-bit PC relative RELA relocation with the addend in
 358   // the reloc.
 359   static inline void
 360   pcrela8(unsigned char* view, unsigned char value, unsigned char addend,
 361           typename elfcpp::Elf_types<size>::Elf_Addr address)
 362   { This::template pcrela<8>(view, value, addend, address); }
 363
 364   static inline void
 365   pcrela8(unsigned char* view,
 366           const Sized_relobj<size, big_endian>* object,
 367           const Symbol_value<size>* psymval,
 368           unsigned char addend,
 369           typename elfcpp::Elf_types<size>::Elf_Addr address)
 370   { This::template pcrela<8>(view, object, psymval, addend, address); }
 371
 372   // Do a simple 16-bit REL relocation with the addend in the section
 373   // contents.
 374   static inline void
 375   rel16(unsigned char* view, elfcpp::Elf_Half value)
 376   { This::template rel<16>(view, value); }
 377
 378   static inline void
 379   rel16(unsigned char* view,
 380         const Sized_relobj<size, big_endian>* object,
 381         const Symbol_value<size>* psymval)
 382   { This::template rel<16>(view, object, psymval); }
 383
 384   // Do an 16-bit RELA relocation with the addend in the relocation.
 385   static inline void
 386   rela16(unsigned char* view, elfcpp::Elf_Half value, elfcpp::Elf_Half addend)
 387   { This::template rela<16>(view, value, addend); }
 388
 389   static inline void
 390   rela16(unsigned char* view,
 391          const Sized_relobj<size, big_endian>* object,
 392          const Symbol_value<size>* psymval,
 393          elfcpp::Elf_Half addend)
 394   { This::template rela<16>(view, object, psymval, addend); }
 395
 396   // Do a 16-bit REL relocation, sign extending the addend to SIZE.
 397   static inline void
 398   rel16s(unsigned char* view,
 399          const Sized_relobj<size, big_endian>* object,
 400          const Symbol_value<size>* psymval)
 401   { This::template signedrel<16>(view, object, psymval); }
 402
 403   // Do a simple 16-bit PC relative REL relocation with the addend in
 404   // the section contents.
 405   static inline void
 406   pcrel16(unsigned char* view, elfcpp::Elf_Half value,
 407           typename elfcpp::Elf_types<size>::Elf_Addr address)
 408   { This::template pcrel<16>(view, value, address); }
 409
 410   static inline void
 411   pcrel16(unsigned char* view,
 412           const Sized_relobj<size, big_endian>* object,
 413           const Symbol_value<size>* psymval,
 414           typename elfcpp::Elf_types<size>::Elf_Addr address)
 415   { This::template pcrel<16>(view, object, psymval, address); }
 416
 417   // Do a simple 16-bit PC relative RELA relocation with the addend in
 418   // the reloc.
 419   static inline void
 420   pcrela16(unsigned char* view, elfcpp::Elf_Half value,
 421            elfcpp::Elf_Half addend,
 422            typename elfcpp::Elf_types<size>::Elf_Addr address)
 423   { This::template pcrela<16>(view, value, addend, address); }
 424
 425   static inline void
 426   pcrela16(unsigned char* view,
 427            const Sized_relobj<size, big_endian>* object,
 428            const Symbol_value<size>* psymval,
 429            elfcpp::Elf_Half addend,
 430            typename elfcpp::Elf_types<size>::Elf_Addr address)
 431   { This::template pcrela<16>(view, object, psymval, addend, address); }
 432
 433   // Do a simple 32-bit REL relocation with the addend in the section
 434   // contents.
 435   static inline void
 436   rel32(unsigned char* view, elfcpp::Elf_Word value)
 437   { This::template rel<32>(view, value); }
 438
 439   static inline void
 440   rel32(unsigned char* view,
 441         const Sized_relobj<size, big_endian>* object,
 442         const Symbol_value<size>* psymval)
 443   { This::template rel<32>(view, object, psymval); }
 444
 445   // Do an 32-bit RELA relocation with the addend in the relocation.
 446   static inline void
 447   rela32(unsigned char* view, elfcpp::Elf_Word value, elfcpp::Elf_Word addend)
 448   { This::template rela<32>(view, value, addend); }
 449
 450   static inline void
 451   rela32(unsigned char* view,
 452          const Sized_relobj<size, big_endian>* object,
 453          const Symbol_value<size>* psymval,
 454          elfcpp::Elf_Word addend)
 455   { This::template rela<32>(view, object, psymval, addend); }
 456
 457   // Do a 32-bit REL relocation, sign extending the addend to SIZE.
 458   static inline void
 459   rel32s(unsigned char* view,
 460          const Sized_relobj<size, big_endian>* object,
 461          const Symbol_value<size>* psymval)
 462   { This::template signedrel<32>(view, object, psymval); }
 463
 464   // Do a simple 32-bit PC relative REL relocation with the addend in
 465   // the section contents.
 466   static inline void
 467   pcrel32(unsigned char* view, elfcpp::Elf_Word value,
 468           typename elfcpp::Elf_types<size>::Elf_Addr address)
 469   { This::template pcrel<32>(view, value, address); }
 470
 471   static inline void
 472   pcrel32(unsigned char* view,
 473           const Sized_relobj<size, big_endian>* object,
 474           const Symbol_value<size>* psymval,
 475           typename elfcpp::Elf_types<size>::Elf_Addr address)
 476   { This::template pcrel<32>(view, object, psymval, address); }
 477
 478   // Do a simple 32-bit PC relative RELA relocation with the addend in
 479   // the relocation.
 480   static inline void
 481   pcrela32(unsigned char* view, elfcpp::Elf_Word value,
 482            elfcpp::Elf_Word addend,
 483            typename elfcpp::Elf_types<size>::Elf_Addr address)
 484   { This::template pcrela<32>(view, value, addend, address); }
 485
 486   static inline void
 487   pcrela32(unsigned char* view,
 488            const Sized_relobj<size, big_endian>* object,
 489            const Symbol_value<size>* psymval,
 490            elfcpp::Elf_Word addend,
 491            typename elfcpp::Elf_types<size>::Elf_Addr address)
 492   { This::template pcrela<32>(view, object, psymval, addend, address); }
 493
 494   // Do a simple 64-bit REL relocation with the addend in the section
 495   // contents.
 496   static inline void
 497   rel64(unsigned char* view, elfcpp::Elf_Xword value)
 498   { This::template rel<64>(view, value); }
 499
 500   static inline void
 501   rel64(unsigned char* view,
 502         const Sized_relobj<size, big_endian>* object,
 503         const Symbol_value<size>* psymval)
 504   { This::template rel<64>(view, object, psymval); }
 505
 506   // Do a 64-bit RELA relocation with the addend in the relocation.
 507   static inline void
 508   rela64(unsigned char* view, elfcpp::Elf_Xword value,
 509          elfcpp::Elf_Xword addend)
 510   { This::template rela<64>(view, value, addend); }
 511
 512   static inline void
 513   rela64(unsigned char* view,
 514          const Sized_relobj<size, big_endian>* object,
 515          const Symbol_value<size>* psymval,
 516          elfcpp::Elf_Xword addend)
 517   { This::template rela<64>(view, object, psymval, addend); }
 518
 519   // Do a simple 64-bit PC relative REL relocation with the addend in
 520   // the section contents.
 521   static inline void
 522   pcrel64(unsigned char* view, elfcpp::Elf_Xword value,
 523           typename elfcpp::Elf_types<size>::Elf_Addr address)
 524   { This::template pcrel<64>(view, value, address); }
 525
 526   static inline void
 527   pcrel64(unsigned char* view,
 528           const Sized_relobj<size, big_endian>* object,
 529           const Symbol_value<size>* psymval,
 530           typename elfcpp::Elf_types<size>::Elf_Addr address)
 531   { This::template pcrel<64>(view, object, psymval, address); }
 532
 533   // Do a simple 64-bit PC relative RELA relocation with the addend in
 534   // the relocation.
 535   static inline void
 536   pcrela64(unsigned char* view, elfcpp::Elf_Xword value,
 537            elfcpp::Elf_Xword addend,
 538            typename elfcpp::Elf_types<size>::Elf_Addr address)
 539   { This::template pcrela<64>(view, value, addend, address); }
 540
 541   static inline void
 542   pcrela64(unsigned char* view,
 543            const Sized_relobj<size, big_endian>* object,
 544            const Symbol_value<size>* psymval,
 545            elfcpp::Elf_Xword addend,
 546            typename elfcpp::Elf_types<size>::Elf_Addr address)
 547   { This::template pcrela<64>(view, object, psymval, addend, address); }
 548 };
 549
 550 // We try to avoid COPY relocations when possible.  A COPY relocation
 551 // may be required when an executable refers to a variable defined in
 552 // a shared library.  COPY relocations are problematic because they
 553 // tie the executable to the exact size of the variable in the shared
 554 // library.  We can avoid them if all the references to the variable
 555 // are in a writeable section.  In that case we can simply use dynamic
 556 // relocations.  However, when scanning relocs, we don't know when we
 557 // see the relocation whether we will be forced to use a COPY
 558 // relocation or not.  So we have to save the relocation during the
 559 // reloc scanning, and then emit it as a dynamic relocation if
 560 // necessary.  This class implements that.  It is used by the target
 561 // specific code.
 562
 563 template<int size, bool big_endian>
 564 class Copy_relocs
 565 {
 566  public:
 567   Copy_relocs()
 568     : entries_()
 569   { }
 570
 571   // Return whether we need a COPY reloc for a reloc against GSYM,
 572   // which is being applied to section SHNDX in OBJECT.
 573   static bool
 574   need_copy_reloc(const General_options*, Relobj* object, unsigned int shndx,
 575                   Sized_symbol<size>* gsym);
 576
 577   // Save a Rel against SYM for possible emission later.  SHNDX is the
 578   // index of the section to which the reloc is being applied.
 579   void
 580   save(Symbol* sym, Relobj*, unsigned int shndx,
 581        const elfcpp::Rel<size, big_endian>&);
 582
 583   // Save a Rela against SYM for possible emission later.
 584   void
 585   save(Symbol* sym, Relobj*, unsigned int shndx,
 586        const elfcpp::Rela<size, big_endian>&);
 587
 588   // Return whether there are any relocs to emit.  This also discards
 589   // entries which need not be emitted.
 590   bool
 591   any_to_emit();
 592
 593   // Emit relocs for each symbol which did not get a COPY reloc (i.e.,
 594   // is still defined in the dynamic object).
 595   template<int sh_type>
 596   void
 597   emit(Output_data_reloc<sh_type, true, size, big_endian>*);
 598
 599  private:
 600   typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
 601   typedef typename elfcpp::Elf_types<size>::Elf_Addr Addend;
 602
 603   // This POD class holds the entries we are saving.
 604   class Copy_reloc_entry
 605   {
 606    public:
 607     Copy_reloc_entry(Symbol* sym, unsigned int reloc_type,
 608                      Relobj* relobj, unsigned int shndx,
 609                      Address address, Addend addend)
 610       : sym_(sym), reloc_type_(reloc_type), relobj_(relobj),
 611         shndx_(shndx), address_(address), addend_(addend)
 612     { }
 613
 614     // Return whether we should emit this reloc.  If we should not
 615     // emit, we clear it.
 616     bool
 617     should_emit();
 618
 619     // Emit this reloc.
 620
 621     void
 622     emit(Output_data_reloc<elfcpp::SHT_REL, true, size, big_endian>*);
 623
 624     void
 625     emit(Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian>*);
 626
 627    private:
 628     Symbol* sym_;
 629     unsigned int reloc_type_;
 630     Relobj* relobj_;
 631     unsigned int shndx_;
 632     Address address_;
 633     Addend addend_;
 634   };
 635
 636   // A list of relocs to be saved.
 637   typedef std::vector<Copy_reloc_entry> Copy_reloc_entries;
 638
 639   // The list of relocs we are saving.
 640   Copy_reloc_entries entries_;
 641 };
 642
 643 } // End namespace gold.
 644
 645 #endif // !defined(GOLD_RELOC_H)