X-Git-Url: https://oss.titaniummirror.com/gitweb?p=msp430-binutils.git;a=blobdiff_plain;f=gold%2Freloc.h;fp=gold%2Freloc.h;h=2229421bbb024a81ae2190056aa6ab42d4335fad;hp=0000000000000000000000000000000000000000;hb=d5da4f291af551c0b8b79e1d4a9b173d60e5c10e;hpb=7b5ea4fcdf2819e070665ab5610f8b48e3867c10

diff --git a/gold/reloc.h b/gold/reloc.h
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+++ b/gold/reloc.h
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+// reloc.h -- relocate input files for gold   -*- C++ -*-
+
+// Copyright 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
+// Written by Ian Lance Taylor <iant@google.com>.
+
+// This file is part of gold.
+
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
+// MA 02110-1301, USA.
+
+#ifndef GOLD_RELOC_H
+#define GOLD_RELOC_H
+
+#include <vector>
+#ifdef HAVE_BYTESWAP_H
+#include <byteswap.h>
+#endif
+
+#include "elfcpp.h"
+#include "workqueue.h"
+
+namespace gold
+{
+
+class General_options;
+class Object;
+class Relobj;
+class Read_relocs_data;
+class Symbol;
+class Layout;
+class Output_data;
+class Output_section;
+
+template<int size>
+class Sized_symbol;
+
+template<int size, bool big_endian>
+class Sized_relobj;
+
+template<int size>
+class Symbol_value;
+
+template<int sh_type, bool dynamic, int size, bool big_endian>
+class Output_data_reloc;
+
+// A class to read the relocations for an object file, and then queue
+// up a task to see if they require any GOT/PLT/COPY relocations in
+// the symbol table.
+
+class Read_relocs : public Task
+{
+ public:
+  // SYMTAB_LOCK is used to lock the symbol table.  BLOCKER should be
+  // unblocked when the Scan_relocs task completes.
+  Read_relocs(const General_options& options, Symbol_table* symtab,
+	      Layout* layout, Relobj* object, Task_token* symtab_lock,
+	      Task_token* blocker)
+    : options_(options), symtab_(symtab), layout_(layout), object_(object),
+      symtab_lock_(symtab_lock), blocker_(blocker)
+  { }
+
+  // The standard Task methods.
+
+  Task_token*
+  is_runnable();
+
+  void
+  locks(Task_locker*);
+
+  void
+  run(Workqueue*);
+
+  std::string
+  get_name() const;
+
+ private:
+  const General_options& options_;
+  Symbol_table* symtab_;
+  Layout* layout_;
+  Relobj* object_;
+  Task_token* symtab_lock_;
+  Task_token* blocker_;
+};
+
+// Process the relocs to figure out which sections are garbage.
+// Very similar to scan relocs.
+
+class Gc_process_relocs : public Task
+{
+ public:
+  // SYMTAB_LOCK is used to lock the symbol table.  BLOCKER should be
+  // unblocked when the task completes.
+  Gc_process_relocs(const General_options& options, Symbol_table* symtab,
+	      Layout* layout, Relobj* object, Read_relocs_data* rd,
+	      Task_token* symtab_lock, Task_token* blocker)
+    : options_(options), symtab_(symtab), layout_(layout), object_(object),
+      rd_(rd), symtab_lock_(symtab_lock), blocker_(blocker)
+  { }
+
+  // The standard Task methods.
+
+  Task_token*
+  is_runnable();
+
+  void
+  locks(Task_locker*);
+
+  void
+  run(Workqueue*);
+
+  std::string
+  get_name() const;
+
+ private:
+  const General_options& options_;
+  Symbol_table* symtab_;
+  Layout* layout_;
+  Relobj* object_;
+  Read_relocs_data* rd_;
+  Task_token* symtab_lock_;
+  Task_token* blocker_;
+};
+
+// Scan the relocations for an object to see if they require any
+// GOT/PLT/COPY relocations.
+
+class Scan_relocs : public Task
+{
+ public:
+  // SYMTAB_LOCK is used to lock the symbol table.  BLOCKER should be
+  // unblocked when the task completes.
+  Scan_relocs(const General_options& options, Symbol_table* symtab,
+	      Layout* layout, Relobj* object, Read_relocs_data* rd,
+	      Task_token* symtab_lock, Task_token* blocker)
+    : options_(options), symtab_(symtab), layout_(layout), object_(object),
+      rd_(rd), symtab_lock_(symtab_lock), blocker_(blocker)
+  { }
+
+  // The standard Task methods.
+
+  Task_token*
+  is_runnable();
+
+  void
+  locks(Task_locker*);
+
+  void
+  run(Workqueue*);
+
+  std::string
+  get_name() const;
+
+ private:
+  const General_options& options_;
+  Symbol_table* symtab_;
+  Layout* layout_;
+  Relobj* object_;
+  Read_relocs_data* rd_;
+  Task_token* symtab_lock_;
+  Task_token* blocker_;
+};
+
+// A class to perform all the relocations for an object file.
+
+class Relocate_task : public Task
+{
+ public:
+  Relocate_task(const General_options& options, const Symbol_table* symtab,
+		const Layout* layout, Relobj* object, Output_file* of,
+		Task_token* input_sections_blocker,
+		Task_token* output_sections_blocker, Task_token* final_blocker)
+    : options_(options), symtab_(symtab), layout_(layout), object_(object),
+      of_(of), input_sections_blocker_(input_sections_blocker),
+      output_sections_blocker_(output_sections_blocker),
+      final_blocker_(final_blocker)
+  { }
+
+  // The standard Task methods.
+
+  Task_token*
+  is_runnable();
+
+  void
+  locks(Task_locker*);
+
+  void
+  run(Workqueue*);
+
+  std::string
+  get_name() const;
+
+ private:
+  const General_options& options_;
+  const Symbol_table* symtab_;
+  const Layout* layout_;
+  Relobj* object_;
+  Output_file* of_;
+  Task_token* input_sections_blocker_;
+  Task_token* output_sections_blocker_;
+  Task_token* final_blocker_;
+};
+
+// During a relocatable link, this class records how relocations
+// should be handled for a single input reloc section.  An instance of
+// this class is created while scanning relocs, and it is used while
+// processing relocs.
+
+class Relocatable_relocs
+{
+ public:
+  // We use a vector of unsigned char to indicate how the input relocs
+  // should be handled.  Each element is one of the following values.
+  // We create this vector when we initially scan the relocations.
+  enum Reloc_strategy
+  {
+    // Copy the input reloc.  Don't modify it other than updating the
+    // r_offset field and the r_sym part of the r_info field.
+    RELOC_COPY,
+    // Copy the input reloc which is against an STT_SECTION symbol.
+    // Update the r_offset and r_sym part of the r_info field.  Adjust
+    // the addend by subtracting the value of the old local symbol and
+    // adding the value of the new local symbol.  The addend is in the
+    // SHT_RELA reloc and the contents of the data section do not need
+    // to be changed.
+    RELOC_ADJUST_FOR_SECTION_RELA,
+    // Like RELOC_ADJUST_FOR_SECTION_RELA but the addend should not be
+    // adjusted.
+    RELOC_ADJUST_FOR_SECTION_0,
+    // Like RELOC_ADJUST_FOR_SECTION_RELA but the contents of the
+    // section need to be changed.  The number indicates the number of
+    // bytes in the addend in the section contents.
+    RELOC_ADJUST_FOR_SECTION_1,
+    RELOC_ADJUST_FOR_SECTION_2,
+    RELOC_ADJUST_FOR_SECTION_4,
+    RELOC_ADJUST_FOR_SECTION_8,
+    // Discard the input reloc--process it completely when relocating
+    // the data section contents.
+    RELOC_DISCARD,
+    // An input reloc which is not discarded, but which requires
+    // target specific processing in order to update it.
+    RELOC_SPECIAL
+  };
+
+  Relocatable_relocs()
+    : reloc_strategies_(), output_reloc_count_(0), posd_(NULL)
+  { }
+
+  // Record the number of relocs.
+  void
+  set_reloc_count(size_t reloc_count)
+  { this->reloc_strategies_.reserve(reloc_count); }
+
+  // Record what to do for the next reloc.
+  void
+  set_next_reloc_strategy(Reloc_strategy strategy)
+  {
+    this->reloc_strategies_.push_back(static_cast<unsigned char>(strategy));
+    if (strategy != RELOC_DISCARD)
+      ++this->output_reloc_count_;
+  }
+
+  // Record the Output_data associated with this reloc section.
+  void
+  set_output_data(Output_data* posd)
+  {
+    gold_assert(this->posd_ == NULL);
+    this->posd_ = posd;
+  }
+
+  // Return the Output_data associated with this reloc section.
+  Output_data*
+  output_data() const
+  { return this->posd_; }
+
+  // Return what to do for reloc I.
+  Reloc_strategy
+  strategy(unsigned int i) const
+  {
+    gold_assert(i < this->reloc_strategies_.size());
+    return static_cast<Reloc_strategy>(this->reloc_strategies_[i]);
+  }
+
+  // Return the number of relocations to create in the output file.
+  size_t
+  output_reloc_count() const
+  { return this->output_reloc_count_; }
+
+ private:
+  typedef std::vector<unsigned char> Reloc_strategies;
+
+  // The strategies for the input reloc.  There is one entry in this
+  // vector for each relocation in the input section.
+  Reloc_strategies reloc_strategies_;
+  // The number of relocations to be created in the output file.
+  size_t output_reloc_count_;
+  // The output data structure associated with this relocation.
+  Output_data* posd_;
+};
+
+// Standard relocation routines which are used on many targets.  Here
+// SIZE and BIG_ENDIAN refer to the target, not the relocation type.
+
+template<int size, bool big_endian>
+class Relocate_functions
+{
+private:
+  // Do a simple relocation with the addend in the section contents.
+  // VALSIZE is the size of the value.
+  template<int valsize>
+  static inline void
+  rel(unsigned char* view,
+      typename elfcpp::Swap<valsize, big_endian>::Valtype value)
+  {
+    typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
+    Valtype* wv = reinterpret_cast<Valtype*>(view);
+    Valtype x = elfcpp::Swap<valsize, big_endian>::readval(wv);
+    elfcpp::Swap<valsize, big_endian>::writeval(wv, x + value);
+  }
+
+  // Do a simple relocation using a Symbol_value with the addend in
+  // the section contents.  VALSIZE is the size of the value to
+  // relocate.
+  template<int valsize>
+  static inline void
+  rel(unsigned char* view,
+      const Sized_relobj<size, big_endian>* object,
+      const Symbol_value<size>* psymval)
+  {
+    typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
+    Valtype* wv = reinterpret_cast<Valtype*>(view);
+    Valtype x = elfcpp::Swap<valsize, big_endian>::readval(wv);
+    x = psymval->value(object, x);
+    elfcpp::Swap<valsize, big_endian>::writeval(wv, x);
+  }
+
+  // Do a simple relocation with the addend in the relocation.
+  // VALSIZE is the size of the value.
+  template<int valsize>
+  static inline void
+  rela(unsigned char* view,
+       typename elfcpp::Swap<valsize, big_endian>::Valtype value,
+       typename elfcpp::Swap<valsize, big_endian>::Valtype addend)
+  {
+    typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
+    Valtype* wv = reinterpret_cast<Valtype*>(view);
+    elfcpp::Swap<valsize, big_endian>::writeval(wv, value + addend);
+  }
+
+  // Do a simple relocation using a symbol value with the addend in
+  // the relocation.  VALSIZE is the size of the value.
+  template<int valsize>
+  static inline void
+  rela(unsigned char* view,
+       const Sized_relobj<size, big_endian>* object,
+       const Symbol_value<size>* psymval,
+       typename elfcpp::Swap<valsize, big_endian>::Valtype addend)
+  {
+    typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
+    Valtype* wv = reinterpret_cast<Valtype*>(view);
+    Valtype x = psymval->value(object, addend);
+    elfcpp::Swap<valsize, big_endian>::writeval(wv, x);
+  }
+
+  // Do a simple PC relative relocation with the addend in the section
+  // contents.  VALSIZE is the size of the value.
+  template<int valsize>
+  static inline void
+  pcrel(unsigned char* view,
+	typename elfcpp::Swap<valsize, big_endian>::Valtype value,
+	typename elfcpp::Elf_types<size>::Elf_Addr address)
+  {
+    typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
+    Valtype* wv = reinterpret_cast<Valtype*>(view);
+    Valtype x = elfcpp::Swap<valsize, big_endian>::readval(wv);
+    elfcpp::Swap<valsize, big_endian>::writeval(wv, x + value - address);
+  }
+
+  // Do a simple PC relative relocation with a Symbol_value with the
+  // addend in the section contents.  VALSIZE is the size of the
+  // value.
+  template<int valsize>
+  static inline void
+  pcrel(unsigned char* view,
+	const Sized_relobj<size, big_endian>* object,
+	const Symbol_value<size>* psymval,
+	typename elfcpp::Elf_types<size>::Elf_Addr address)
+  {
+    typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
+    Valtype* wv = reinterpret_cast<Valtype*>(view);
+    Valtype x = elfcpp::Swap<valsize, big_endian>::readval(wv);
+    x = psymval->value(object, x);
+    elfcpp::Swap<valsize, big_endian>::writeval(wv, x - address);
+  }
+
+  // Do a simple PC relative relocation with the addend in the
+  // relocation.  VALSIZE is the size of the value.
+  template<int valsize>
+  static inline void
+  pcrela(unsigned char* view,
+	 typename elfcpp::Swap<valsize, big_endian>::Valtype value,
+	 typename elfcpp::Swap<valsize, big_endian>::Valtype addend,
+	 typename elfcpp::Elf_types<size>::Elf_Addr address)
+  {
+    typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
+    Valtype* wv = reinterpret_cast<Valtype*>(view);
+    elfcpp::Swap<valsize, big_endian>::writeval(wv, value + addend - address);
+  }
+
+  // Do a simple PC relative relocation with a Symbol_value with the
+  // addend in the relocation.  VALSIZE is the size of the value.
+  template<int valsize>
+  static inline void
+  pcrela(unsigned char* view,
+	 const Sized_relobj<size, big_endian>* object,
+	 const Symbol_value<size>* psymval,
+	 typename elfcpp::Swap<valsize, big_endian>::Valtype addend,
+	 typename elfcpp::Elf_types<size>::Elf_Addr address)
+  {
+    typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
+    Valtype* wv = reinterpret_cast<Valtype*>(view);
+    Valtype x = psymval->value(object, addend);
+    elfcpp::Swap<valsize, big_endian>::writeval(wv, x - address);
+  }
+
+  typedef Relocate_functions<size, big_endian> This;
+
+public:
+  // Do a simple 8-bit REL relocation with the addend in the section
+  // contents.
+  static inline void
+  rel8(unsigned char* view, unsigned char value)
+  { This::template rel<8>(view, value); }
+
+  static inline void
+  rel8(unsigned char* view,
+       const Sized_relobj<size, big_endian>* object,
+       const Symbol_value<size>* psymval)
+  { This::template rel<8>(view, object, psymval); }
+
+  // Do an 8-bit RELA relocation with the addend in the relocation.
+  static inline void
+  rela8(unsigned char* view, unsigned char value, unsigned char addend)
+  { This::template rela<8>(view, value, addend); }
+
+  static inline void
+  rela8(unsigned char* view,
+	const Sized_relobj<size, big_endian>* object,
+	const Symbol_value<size>* psymval,
+	unsigned char addend)
+  { This::template rela<8>(view, object, psymval, addend); }
+
+  // Do a simple 8-bit PC relative relocation with the addend in the
+  // section contents.
+  static inline void
+  pcrel8(unsigned char* view, unsigned char value,
+	 typename elfcpp::Elf_types<size>::Elf_Addr address)
+  { This::template pcrel<8>(view, value, address); }
+
+  static inline void
+  pcrel8(unsigned char* view,
+	 const Sized_relobj<size, big_endian>* object,
+	 const Symbol_value<size>* psymval,
+	 typename elfcpp::Elf_types<size>::Elf_Addr address)
+  { This::template pcrel<8>(view, object, psymval, address); }
+
+  // Do a simple 8-bit PC relative RELA relocation with the addend in
+  // the reloc.
+  static inline void
+  pcrela8(unsigned char* view, unsigned char value, unsigned char addend,
+	  typename elfcpp::Elf_types<size>::Elf_Addr address)
+  { This::template pcrela<8>(view, value, addend, address); }
+
+  static inline void
+  pcrela8(unsigned char* view,
+	  const Sized_relobj<size, big_endian>* object,
+	  const Symbol_value<size>* psymval,
+	  unsigned char addend,
+	  typename elfcpp::Elf_types<size>::Elf_Addr address)
+  { This::template pcrela<8>(view, object, psymval, addend, address); }
+
+  // Do a simple 16-bit REL relocation with the addend in the section
+  // contents.
+  static inline void
+  rel16(unsigned char* view, elfcpp::Elf_Half value)
+  { This::template rel<16>(view, value); }
+
+  static inline void
+  rel16(unsigned char* view,
+	const Sized_relobj<size, big_endian>* object,
+	const Symbol_value<size>* psymval)
+  { This::template rel<16>(view, object, psymval); }
+
+  // Do an 16-bit RELA relocation with the addend in the relocation.
+  static inline void
+  rela16(unsigned char* view, elfcpp::Elf_Half value, elfcpp::Elf_Half addend)
+  { This::template rela<16>(view, value, addend); }
+
+  static inline void
+  rela16(unsigned char* view,
+	 const Sized_relobj<size, big_endian>* object,
+	 const Symbol_value<size>* psymval,
+	 elfcpp::Elf_Half addend)
+  { This::template rela<16>(view, object, psymval, addend); }
+
+  // Do a simple 16-bit PC relative REL relocation with the addend in
+  // the section contents.
+  static inline void
+  pcrel16(unsigned char* view, elfcpp::Elf_Half value,
+	  typename elfcpp::Elf_types<size>::Elf_Addr address)
+  { This::template pcrel<16>(view, value, address); }
+
+  static inline void
+  pcrel16(unsigned char* view,
+	  const Sized_relobj<size, big_endian>* object,
+	  const Symbol_value<size>* psymval,
+	  typename elfcpp::Elf_types<size>::Elf_Addr address)
+  { This::template pcrel<16>(view, object, psymval, address); }
+
+  // Do a simple 16-bit PC relative RELA relocation with the addend in
+  // the reloc.
+  static inline void
+  pcrela16(unsigned char* view, elfcpp::Elf_Half value,
+	   elfcpp::Elf_Half addend,
+           typename elfcpp::Elf_types<size>::Elf_Addr address)
+  { This::template pcrela<16>(view, value, addend, address); }
+
+  static inline void
+  pcrela16(unsigned char* view,
+	   const Sized_relobj<size, big_endian>* object,
+	   const Symbol_value<size>* psymval,
+	   elfcpp::Elf_Half addend,
+	   typename elfcpp::Elf_types<size>::Elf_Addr address)
+  { This::template pcrela<16>(view, object, psymval, addend, address); }
+
+  // Do a simple 32-bit REL relocation with the addend in the section
+  // contents.
+  static inline void
+  rel32(unsigned char* view, elfcpp::Elf_Word value)
+  { This::template rel<32>(view, value); }
+
+  static inline void
+  rel32(unsigned char* view,
+	const Sized_relobj<size, big_endian>* object,
+	const Symbol_value<size>* psymval)
+  { This::template rel<32>(view, object, psymval); }
+
+  // Do an 32-bit RELA relocation with the addend in the relocation.
+  static inline void
+  rela32(unsigned char* view, elfcpp::Elf_Word value, elfcpp::Elf_Word addend)
+  { This::template rela<32>(view, value, addend); }
+
+  static inline void
+  rela32(unsigned char* view,
+	 const Sized_relobj<size, big_endian>* object,
+	 const Symbol_value<size>* psymval,
+	 elfcpp::Elf_Word addend)
+  { This::template rela<32>(view, object, psymval, addend); }
+
+  // Do a simple 32-bit PC relative REL relocation with the addend in
+  // the section contents.
+  static inline void
+  pcrel32(unsigned char* view, elfcpp::Elf_Word value,
+	  typename elfcpp::Elf_types<size>::Elf_Addr address)
+  { This::template pcrel<32>(view, value, address); }
+
+  static inline void
+  pcrel32(unsigned char* view,
+	  const Sized_relobj<size, big_endian>* object,
+	  const Symbol_value<size>* psymval,
+	  typename elfcpp::Elf_types<size>::Elf_Addr address)
+  { This::template pcrel<32>(view, object, psymval, address); }
+
+  // Do a simple 32-bit PC relative RELA relocation with the addend in
+  // the relocation.
+  static inline void
+  pcrela32(unsigned char* view, elfcpp::Elf_Word value,
+           elfcpp::Elf_Word addend,
+           typename elfcpp::Elf_types<size>::Elf_Addr address)
+  { This::template pcrela<32>(view, value, addend, address); }
+
+  static inline void
+  pcrela32(unsigned char* view,
+	   const Sized_relobj<size, big_endian>* object,
+	   const Symbol_value<size>* psymval,
+	   elfcpp::Elf_Word addend,
+	   typename elfcpp::Elf_types<size>::Elf_Addr address)
+  { This::template pcrela<32>(view, object, psymval, addend, address); }
+
+  // Do a simple 64-bit REL relocation with the addend in the section
+  // contents.
+  static inline void
+  rel64(unsigned char* view, elfcpp::Elf_Xword value)
+  { This::template rel<64>(view, value); }
+
+  static inline void
+  rel64(unsigned char* view,
+	const Sized_relobj<size, big_endian>* object,
+	const Symbol_value<size>* psymval)
+  { This::template rel<64>(view, object, psymval); }
+
+  // Do a 64-bit RELA relocation with the addend in the relocation.
+  static inline void
+  rela64(unsigned char* view, elfcpp::Elf_Xword value,
+         elfcpp::Elf_Xword addend)
+  { This::template rela<64>(view, value, addend); }
+
+  static inline void
+  rela64(unsigned char* view,
+	 const Sized_relobj<size, big_endian>* object,
+	 const Symbol_value<size>* psymval,
+	 elfcpp::Elf_Xword addend)
+  { This::template rela<64>(view, object, psymval, addend); }
+
+  // Do a simple 64-bit PC relative REL relocation with the addend in
+  // the section contents.
+  static inline void
+  pcrel64(unsigned char* view, elfcpp::Elf_Xword value,
+	  typename elfcpp::Elf_types<size>::Elf_Addr address)
+  { This::template pcrel<64>(view, value, address); }
+
+  static inline void
+  pcrel64(unsigned char* view,
+	  const Sized_relobj<size, big_endian>* object,
+	  const Symbol_value<size>* psymval,
+	  typename elfcpp::Elf_types<size>::Elf_Addr address)
+  { This::template pcrel<64>(view, object, psymval, address); }
+
+  // Do a simple 64-bit PC relative RELA relocation with the addend in
+  // the relocation.
+  static inline void
+  pcrela64(unsigned char* view, elfcpp::Elf_Xword value,
+           elfcpp::Elf_Xword addend,
+           typename elfcpp::Elf_types<size>::Elf_Addr address)
+  { This::template pcrela<64>(view, value, addend, address); }
+
+  static inline void
+  pcrela64(unsigned char* view,
+	   const Sized_relobj<size, big_endian>* object,
+	   const Symbol_value<size>* psymval,
+	   elfcpp::Elf_Xword addend,
+	   typename elfcpp::Elf_types<size>::Elf_Addr address)
+  { This::template pcrela<64>(view, object, psymval, addend, address); }
+};
+
+// Track relocations while reading a section.  This lets you ask for
+// the relocation at a certain offset, and see how relocs occur
+// between points of interest.
+
+template<int size, bool big_endian>
+class Track_relocs
+{
+ public:
+  Track_relocs()
+    : prelocs_(NULL), len_(0), pos_(0), reloc_size_(0)
+  { }
+
+  // Initialize the Track_relocs object.  OBJECT is the object holding
+  // the reloc section, RELOC_SHNDX is the section index of the reloc
+  // section, and RELOC_TYPE is the type of the reloc section
+  // (elfcpp::SHT_REL or elfcpp::SHT_RELA).  This returns false if
+  // something went wrong.
+  bool
+  initialize(Object* object, unsigned int reloc_shndx,
+	     unsigned int reloc_type);
+
+  // Return the offset in the data section to which the next reloc
+  // applies.  THis returns -1 if there is no next reloc.
+  off_t
+  next_offset() const;
+
+  // Return the symbol index of the next reloc.  This returns -1U if
+  // there is no next reloc.
+  unsigned int
+  next_symndx() const;
+
+  // Advance to OFFSET within the data section, and return the number
+  // of relocs which would be skipped.
+  int
+  advance(off_t offset);
+
+ private:
+  // The contents of the input object's reloc section.
+  const unsigned char* prelocs_;
+  // The length of the reloc section.
+  section_size_type len_;
+  // Our current position in the reloc section.
+  section_size_type pos_;
+  // The size of the relocs in the section.
+  int reloc_size_;
+};
+
+} // End namespace gold.
+
+#endif // !defined(GOLD_RELOC_H)