Update copyright years. Update language files.
[deliverable/binutils-gdb.git] / gold / reloc.cc
index d50674f6d77159349b2f6c23038d80cd137802f8..e4601a32cc67e7a9addced25e187d8d266d1deea 100644 (file)
@@ -1,6 +1,6 @@
 // reloc.cc -- relocate input files for gold.
 
-// Copyright 2006, 2007 Free Software Foundation, Inc.
+// Copyright 2006, 2007, 2008 Free Software Foundation, Inc.
 // Written by Ian Lance Taylor <iant@google.com>.
 
 // This file is part of gold.
 
 #include "gold.h"
 
+#include <algorithm>
+
 #include "workqueue.h"
-#include "object.h"
 #include "symtab.h"
 #include "output.h"
+#include "merge.h"
+#include "object.h"
+#include "target-reloc.h"
 #include "reloc.h"
 
 namespace gold
@@ -37,18 +41,18 @@ namespace gold
 // After reading it, the start another task to process the
 // information.  These tasks requires access to the file.
 
-Task::Is_runnable_type
-Read_relocs::is_runnable(Workqueue*)
+Task_token*
+Read_relocs::is_runnable()
 {
-  return this->object_->is_locked() ? IS_LOCKED : IS_RUNNABLE;
+  return this->object_->is_locked() ? this->object_->token() : NULL;
 }
 
 // Lock the file.
 
-Task_locker*
-Read_relocs::locks(Workqueue*)
+void
+Read_relocs::locks(Task_locker* tl)
 {
-  return new Task_locker_obj<Object>(*this->object_);
+  tl->add(this, this->object_->token());
 }
 
 // Read the relocations and then start a Scan_relocs_task.
@@ -58,9 +62,11 @@ Read_relocs::run(Workqueue* workqueue)
 {
   Read_relocs_data *rd = new Read_relocs_data;
   this->object_->read_relocs(rd);
-  workqueue->queue_front(new Scan_relocs(this->options_, this->symtab_,
-                                        this->layout_, this->object_, rd,
-                                        this->symtab_lock_, this->blocker_));
+  this->object_->release();
+
+  workqueue->queue_next(new Scan_relocs(this->options_, this->symtab_,
+                                       this->layout_, this->object_, rd,
+                                       this->symtab_lock_, this->blocker_));
 }
 
 // Return a debugging name for the task.
@@ -78,37 +84,25 @@ Read_relocs::get_name() const
 // use a lock on the symbol table to keep them from interfering with
 // each other.
 
-Task::Is_runnable_type
-Scan_relocs::is_runnable(Workqueue*)
+Task_token*
+Scan_relocs::is_runnable()
 {
-  if (!this->symtab_lock_->is_writable() || this->object_->is_locked())
-    return IS_LOCKED;
-  return IS_RUNNABLE;
+  if (!this->symtab_lock_->is_writable())
+    return this->symtab_lock_;
+  if (this->object_->is_locked())
+    return this->object_->token();
+  return NULL;
 }
 
 // Return the locks we hold: one on the file, one on the symbol table
 // and one blocker.
 
-class Scan_relocs::Scan_relocs_locker : public Task_locker
-{
- public:
-  Scan_relocs_locker(Object* object, Task_token& symtab_lock, Task* task,
-                    Task_token& blocker, Workqueue* workqueue)
-    : objlock_(*object), symtab_locker_(symtab_lock, task),
-      blocker_(blocker, workqueue)
-  { }
-
- private:
-  Task_locker_obj<Object> objlock_;
-  Task_locker_write symtab_locker_;
-  Task_locker_block blocker_;
-};
-
-Task_locker*
-Scan_relocs::locks(Workqueue* workqueue)
+void
+Scan_relocs::locks(Task_locker* tl)
 {
-  return new Scan_relocs_locker(this->object_, *this->symtab_lock_, this,
-                               *this->blocker_, workqueue);
+  tl->add(this, this->object_->token());
+  tl->add(this, this->symtab_lock_);
+  tl->add(this, this->blocker_);
 }
 
 // Scan the relocs.
@@ -118,6 +112,7 @@ Scan_relocs::run(Workqueue*)
 {
   this->object_->scan_relocs(this->options_, this->symtab_, this->layout_,
                             this->rd_);
+  this->object_->release();
   delete this->rd_;
   this->rd_ = NULL;
 }
@@ -134,46 +129,30 @@ Scan_relocs::get_name() const
 
 // We may have to wait for the output sections to be written.
 
-Task::Is_runnable_type
-Relocate_task::is_runnable(Workqueue*)
+Task_token*
+Relocate_task::is_runnable()
 {
   if (this->object_->relocs_must_follow_section_writes()
       && this->output_sections_blocker_->is_blocked())
-    return IS_BLOCKED;
+    return this->output_sections_blocker_;
 
   if (this->object_->is_locked())
-    return IS_LOCKED;
+    return this->object_->token();
 
-  return IS_RUNNABLE;
+  return NULL;
 }
 
 // We want to lock the file while we run.  We want to unblock
 // INPUT_SECTIONS_BLOCKER and FINAL_BLOCKER when we are done.
+// INPUT_SECTIONS_BLOCKER may be NULL.
 
-class Relocate_task::Relocate_locker : public Task_locker
-{
- public:
-  Relocate_locker(Task_token& input_sections_blocker,
-                 Task_token& final_blocker, Workqueue* workqueue,
-                 Object* object)
-    : input_sections_blocker_(input_sections_blocker, workqueue),
-      final_blocker_(final_blocker, workqueue),
-      objlock_(*object)
-  { }
-
- private:
-  Task_block_token input_sections_blocker_;
-  Task_block_token final_blocker_;
-  Task_locker_obj<Object> objlock_;
-};
-
-Task_locker*
-Relocate_task::locks(Workqueue* workqueue)
+void
+Relocate_task::locks(Task_locker* tl)
 {
-  return new Relocate_locker(*this->input_sections_blocker_,
-                            *this->final_blocker_,
-                            workqueue,
-                            this->object_);
+  if (this->input_sections_blocker_ != NULL)
+    tl->add(this, this->input_sections_blocker_);
+  tl->add(this, this->final_blocker_);
+  tl->add(this, this->object_->token());
 }
 
 // Run the task.
@@ -183,6 +162,12 @@ Relocate_task::run(Workqueue*)
 {
   this->object_->relocate(this->options_, this->symtab_, this->layout_,
                          this->of_);
+
+  // This is normally the last thing we will do with an object, so
+  // uncache all views.
+  this->object_->clear_view_cache_marks();
+
+  this->object_->release();
 }
 
 // Return a debugging name for the task.
@@ -238,9 +223,14 @@ Sized_relobj<size, big_endian>::do_read_relocs(Read_relocs_data* rd)
       // We are scanning relocations in order to fill out the GOT and
       // PLT sections.  Relocations for sections which are not
       // allocated (typically debugging sections) should not add new
-      // GOT and PLT entries.  So we skip them.
+      // GOT and PLT entries.  So we skip them unless this is a
+      // relocatable link or we need to emit relocations.
       typename This::Shdr secshdr(pshdrs + shndx * This::shdr_size);
-      if ((secshdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0)
+      bool is_section_allocated = ((secshdr.get_sh_flags() & elfcpp::SHF_ALLOC)
+                                  != 0);
+      if (!is_section_allocated
+         && !parameters->options().relocatable()
+         && !parameters->options().emit_relocs())
        continue;
 
       if (shdr.get_sh_link() != this->symtab_shndx_)
@@ -284,6 +274,7 @@ Sized_relobj<size, big_endian>::do_read_relocs(Read_relocs_data* rd)
       sr.reloc_count = reloc_count;
       sr.output_section = os;
       sr.needs_special_offset_handling = map_sections[shndx].offset == -1;
+      sr.is_data_section_allocated = is_section_allocated;
     }
 
   // Read the local symbols.
@@ -326,11 +317,37 @@ Sized_relobj<size, big_endian>::do_scan_relocs(const General_options& options,
        p != rd->relocs.end();
        ++p)
     {
-      target->scan_relocs(options, symtab, layout, this, p->data_shndx,
-                         p->sh_type, p->contents->data(), p->reloc_count,
-                         p->output_section, p->needs_special_offset_handling,
-                         this->local_symbol_count_,
-                         local_symbols);
+      if (!parameters->options().relocatable())
+       {
+         // As noted above, when not generating an object file, we
+         // only scan allocated sections.  We may see a non-allocated
+         // section here if we are emitting relocs.
+         if (p->is_data_section_allocated)
+           target->scan_relocs(options, symtab, layout, this, p->data_shndx,
+                               p->sh_type, p->contents->data(),
+                               p->reloc_count, p->output_section,
+                               p->needs_special_offset_handling,
+                               this->local_symbol_count_,
+                               local_symbols);
+         if (parameters->options().emit_relocs())
+           this->emit_relocs_scan(options, symtab, layout, local_symbols, p);
+       }
+      else
+       {
+         Relocatable_relocs* rr = this->relocatable_relocs(p->reloc_shndx);
+         gold_assert(rr != NULL);
+         rr->set_reloc_count(p->reloc_count);
+         target->scan_relocatable_relocs(options, symtab, layout, this,
+                                         p->data_shndx, p->sh_type,
+                                         p->contents->data(),
+                                         p->reloc_count,
+                                         p->output_section,
+                                         p->needs_special_offset_handling,
+                                         this->local_symbol_count_,
+                                         local_symbols,
+                                         rr);
+       }
+
       delete p->contents;
       p->contents = NULL;
     }
@@ -342,6 +359,98 @@ Sized_relobj<size, big_endian>::do_scan_relocs(const General_options& options,
     }
 }
 
+// This is a strategy class we use when scanning for --emit-relocs.
+
+template<int sh_type>
+class Emit_relocs_strategy
+{
+ public:
+  // A local non-section symbol.
+  inline Relocatable_relocs::Reloc_strategy
+  local_non_section_strategy(unsigned int, Relobj*)
+  { return Relocatable_relocs::RELOC_COPY; }
+
+  // A local section symbol.
+  inline Relocatable_relocs::Reloc_strategy
+  local_section_strategy(unsigned int, Relobj*)
+  {
+    if (sh_type == elfcpp::SHT_RELA)
+      return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_RELA;
+    else
+      {
+       // The addend is stored in the section contents.  Since this
+       // is not a relocatable link, we are going to apply the
+       // relocation contents to the section as usual.  This means
+       // that we have no way to record the original addend.  If the
+       // original addend is not zero, there is basically no way for
+       // the user to handle this correctly.  Caveat emptor.
+       return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_0;
+      }
+  }
+
+  // A global symbol.
+  inline Relocatable_relocs::Reloc_strategy
+  global_strategy(unsigned int, Relobj*, unsigned int)
+  { return Relocatable_relocs::RELOC_COPY; }
+};
+
+// Scan the input relocations for --emit-relocs.
+
+template<int size, bool big_endian>
+void
+Sized_relobj<size, big_endian>::emit_relocs_scan(
+    const General_options& options,
+    Symbol_table* symtab,
+    Layout* layout,
+    const unsigned char* plocal_syms,
+    const Read_relocs_data::Relocs_list::iterator& p)
+{
+  Relocatable_relocs* rr = this->relocatable_relocs(p->reloc_shndx);
+  gold_assert(rr != NULL);
+  rr->set_reloc_count(p->reloc_count);
+
+  if (p->sh_type == elfcpp::SHT_REL)
+    this->emit_relocs_scan_reltype<elfcpp::SHT_REL>(options, symtab, layout,
+                                                   plocal_syms, p, rr);
+  else
+    {
+      gold_assert(p->sh_type == elfcpp::SHT_RELA);
+      this->emit_relocs_scan_reltype<elfcpp::SHT_RELA>(options, symtab,
+                                                      layout, plocal_syms, p,
+                                                      rr);
+    }
+}
+
+// Scan the input relocation for --emit-relocs, templatized on the
+// type of the relocation section.
+
+template<int size, bool big_endian>
+template<int sh_type>
+void
+Sized_relobj<size, big_endian>::emit_relocs_scan_reltype(
+    const General_options& options,
+    Symbol_table* symtab,
+    Layout* layout,
+    const unsigned char* plocal_syms,
+    const Read_relocs_data::Relocs_list::iterator& p,
+    Relocatable_relocs* rr)
+{
+  scan_relocatable_relocs<size, big_endian, sh_type,
+                         Emit_relocs_strategy<sh_type> >(
+    options,
+    symtab,
+    layout,
+    this,
+    p->data_shndx,
+    p->contents->data(),
+    p->reloc_count,
+    p->output_section,
+    p->needs_special_offset_handling,
+    this->local_symbol_count_,
+    plocal_syms,
+    rr);
+}
+
 // Relocate the input sections and write out the local symbols.
 
 template<int size, bool big_endian>
@@ -367,28 +476,52 @@ Sized_relobj<size, big_endian>::do_relocate(const General_options& options,
 
   this->write_sections(pshdrs, of, &views);
 
+  // To speed up relocations, we set up hash tables for fast lookup of
+  // input offsets to output addresses.
+  this->initialize_input_to_output_maps();
+
   // Apply relocations.
 
   this->relocate_sections(options, symtab, layout, pshdrs, &views);
 
+  // After we've done the relocations, we release the hash tables,
+  // since we no longer need them.
+  this->free_input_to_output_maps();
+
   // Write out the accumulated views.
   for (unsigned int i = 1; i < shnum; ++i)
     {
       if (views[i].view != NULL)
        {
-         if (views[i].is_input_output_view)
-           of->write_input_output_view(views[i].offset, views[i].view_size,
-                                       views[i].view);
-         else
-           of->write_output_view(views[i].offset, views[i].view_size,
-                                 views[i].view);
+         if (!views[i].is_postprocessing_view)
+           {
+             if (views[i].is_input_output_view)
+               of->write_input_output_view(views[i].offset,
+                                           views[i].view_size,
+                                           views[i].view);
+             else
+               of->write_output_view(views[i].offset, views[i].view_size,
+                                     views[i].view);
+           }
        }
     }
 
   // Write out the local symbols.
-  this->write_local_symbols(of, layout->sympool());
+  this->write_local_symbols(of, layout->sympool(), layout->dynpool());
+
+  // We should no longer need the local symbol values.
+  this->clear_local_symbols();
 }
 
+// Sort a Read_multiple vector by file offset.
+struct Read_multiple_compare
+{
+  inline bool
+  operator()(const File_read::Read_multiple_entry& rme1,
+            const File_read::Read_multiple_entry& rme2) const
+  { return rme1.file_offset < rme2.file_offset; }
+};
+
 // Write section data to the output file.  PSHDRS points to the
 // section headers.  Record the views in *PVIEWS for use when
 // relocating.
@@ -400,7 +533,10 @@ Sized_relobj<size, big_endian>::write_sections(const unsigned char* pshdrs,
                                               Views* pviews)
 {
   unsigned int shnum = this->shnum();
-  std::vector<Map_to_output>& map_sections(this->map_to_output());
+  const std::vector<Map_to_output>& map_sections(this->map_to_output());
+
+  File_read::Read_multiple rm;
+  bool is_sorted = true;
 
   const unsigned char* p = pshdrs + This::shdr_size;
   for (unsigned int i = 1; i < shnum; ++i, p += This::shdr_size)
@@ -419,17 +555,75 @@ Sized_relobj<size, big_endian>::write_sections(const unsigned char* pshdrs,
       if (shdr.get_sh_type() == elfcpp::SHT_NOBITS)
        continue;
 
+      if ((parameters->options().relocatable()
+          || parameters->options().emit_relocs())
+         && (shdr.get_sh_type() == elfcpp::SHT_REL
+             || shdr.get_sh_type() == elfcpp::SHT_RELA)
+         && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0)
+       {
+         // This is a reloc section in a relocatable link or when
+         // emitting relocs.  We don't need to read the input file.
+         // The size and file offset are stored in the
+         // Relocatable_relocs structure.
+         Relocatable_relocs* rr = this->relocatable_relocs(i);
+         gold_assert(rr != NULL);
+         Output_data* posd = rr->output_data();
+         gold_assert(posd != NULL);
+
+         pvs->offset = posd->offset();
+         pvs->view_size = posd->data_size();
+         pvs->view = of->get_output_view(pvs->offset, pvs->view_size);
+         pvs->address = posd->address();
+         pvs->is_input_output_view = false;
+         pvs->is_postprocessing_view = false;
+
+         continue;
+       }
+
+      // In the normal case, this input section is simply mapped to
+      // the output section at offset OUTPUT_OFFSET.
+
+      // However, if OUTPUT_OFFSET == -1, then input data is handled
+      // specially--e.g., a .eh_frame section.  The relocation
+      // routines need to check for each reloc where it should be
+      // applied.  For this case, we need an input/output view for the
+      // entire contents of the section in the output file.  We don't
+      // want to copy the contents of the input section to the output
+      // section; the output section contents were already written,
+      // and we waited for them in Relocate_task::is_runnable because
+      // relocs_must_follow_section_writes is set for the object.
+
+      // Regardless of which of the above cases is true, we have to
+      // check requires_postprocessing of the output section.  If that
+      // is false, then we work with views of the output file
+      // directly.  If it is true, then we work with a separate
+      // buffer, and the output section is responsible for writing the
+      // final data to the output file.
+
+      off_t output_section_offset;
+      off_t output_section_size;
+      if (!os->requires_postprocessing())
+       {
+         output_section_offset = os->offset();
+         output_section_size = os->data_size();
+       }
+      else
+       {
+         output_section_offset = 0;
+         output_section_size = os->postprocessing_buffer_size();
+       }
+
       off_t view_start;
-      off_t view_size;
+      section_size_type view_size;
       if (output_offset != -1)
        {
-         view_start = os->offset() + output_offset;
-         view_size = shdr.get_sh_size();
+         view_start = output_section_offset + output_offset;
+         view_size = convert_to_section_size_type(shdr.get_sh_size());
        }
       else
        {
-         view_start = os->offset();
-         view_size = os->data_size();
+         view_start = output_section_offset;
+         view_size = convert_to_section_size_type(output_section_size);
        }
 
       if (view_size == 0)
@@ -437,15 +631,36 @@ Sized_relobj<size, big_endian>::write_sections(const unsigned char* pshdrs,
 
       gold_assert(output_offset == -1
                  || (output_offset >= 0
-                     && output_offset + view_size <= os->data_size()));
+                     && (output_offset + static_cast<off_t>(view_size)
+                          <= output_section_size)));
 
       unsigned char* view;
-      if (output_offset == -1)
-       view = of->get_input_output_view(view_start, view_size);
+      if (os->requires_postprocessing())
+       {
+         unsigned char* buffer = os->postprocessing_buffer();
+         view = buffer + view_start;
+         if (output_offset != -1)
+           {
+             off_t sh_offset = shdr.get_sh_offset();
+             if (!rm.empty() && rm.back().file_offset > sh_offset)
+               is_sorted = false;
+             rm.push_back(File_read::Read_multiple_entry(sh_offset,
+                                                         view_size, view));
+           }
+       }
       else
        {
-         view = of->get_output_view(view_start, view_size);
-         this->read(shdr.get_sh_offset(), view_size, view);
+         if (output_offset == -1)
+           view = of->get_input_output_view(view_start, view_size);
+         else
+           {
+             view = of->get_output_view(view_start, view_size);
+             off_t sh_offset = shdr.get_sh_offset();
+             if (!rm.empty() && rm.back().file_offset > sh_offset)
+               is_sorted = false;
+             rm.push_back(File_read::Read_multiple_entry(sh_offset,
+                                                         view_size, view));
+           }
        }
 
       pvs->view = view;
@@ -455,6 +670,15 @@ Sized_relobj<size, big_endian>::write_sections(const unsigned char* pshdrs,
       pvs->offset = view_start;
       pvs->view_size = view_size;
       pvs->is_input_output_view = output_offset == -1;
+      pvs->is_postprocessing_view = os->requires_postprocessing();
+    }
+
+  // Actually read the data.
+  if (!rm.empty())
+    {
+      if (!is_sorted)
+       std::sort(rm.begin(), rm.end(), Read_multiple_compare());
+      this->read_multiple(rm);
     }
 }
 
@@ -473,7 +697,7 @@ Sized_relobj<size, big_endian>::relocate_sections(
   unsigned int shnum = this->shnum();
   Sized_target<size, big_endian>* target = this->sized_target();
 
-  std::vector<Map_to_output>& map_sections(this->map_to_output());
+  const std::vector<Map_to_output>& map_sections(this->map_to_output());
 
   Relocate_info<size, big_endian> relinfo;
   relinfo.options = &options;
@@ -508,6 +732,8 @@ Sized_relobj<size, big_endian>::relocate_sections(
       off_t output_offset = map_sections[index].offset;
 
       gold_assert((*pviews)[index].view != NULL);
+      if (parameters->options().relocatable())
+       gold_assert((*pviews)[i].view != NULL);
 
       if (shdr.get_sh_link() != this->symtab_shndx_)
        {
@@ -543,20 +769,189 @@ Sized_relobj<size, big_endian>::relocate_sections(
          continue;
        }
 
+      gold_assert(output_offset != -1
+                 || this->relocs_must_follow_section_writes());
+
       relinfo.reloc_shndx = i;
       relinfo.data_shndx = index;
-      target->relocate_section(&relinfo,
-                              sh_type,
-                              prelocs,
-                              reloc_count,
-                              os,
-                              output_offset == -1,
-                              (*pviews)[index].view,
-                              (*pviews)[index].address,
-                              (*pviews)[index].view_size);
+      if (!parameters->options().relocatable())
+       {
+         target->relocate_section(&relinfo,
+                                  sh_type,
+                                  prelocs,
+                                  reloc_count,
+                                  os,
+                                  output_offset == -1,
+                                  (*pviews)[index].view,
+                                  (*pviews)[index].address,
+                                  (*pviews)[index].view_size);
+         if (parameters->options().emit_relocs())
+           this->emit_relocs(&relinfo, i, sh_type, prelocs, reloc_count,
+                             os, output_offset,
+                             (*pviews)[index].view,
+                             (*pviews)[index].address,
+                             (*pviews)[index].view_size,
+                             (*pviews)[i].view,
+                             (*pviews)[i].view_size);
+       }
+      else
+       {
+         Relocatable_relocs* rr = this->relocatable_relocs(i);
+         target->relocate_for_relocatable(&relinfo,
+                                          sh_type,
+                                          prelocs,
+                                          reloc_count,
+                                          os,
+                                          output_offset,
+                                          rr,
+                                          (*pviews)[index].view,
+                                          (*pviews)[index].address,
+                                          (*pviews)[index].view_size,
+                                          (*pviews)[i].view,
+                                          (*pviews)[i].view_size);
+       }
     }
 }
 
+// Emit the relocs for --emit-relocs.
+
+template<int size, bool big_endian>
+void
+Sized_relobj<size, big_endian>::emit_relocs(
+    const Relocate_info<size, big_endian>* relinfo,
+    unsigned int i,
+    unsigned int sh_type,
+    const unsigned char* prelocs,
+    size_t reloc_count,
+    Output_section* output_section,
+    off_t offset_in_output_section,
+    unsigned char* view,
+    typename elfcpp::Elf_types<size>::Elf_Addr address,
+    section_size_type view_size,
+    unsigned char* reloc_view,
+    section_size_type reloc_view_size)
+{
+  if (sh_type == elfcpp::SHT_REL)
+    this->emit_relocs_reltype<elfcpp::SHT_REL>(relinfo, i, prelocs,
+                                              reloc_count, output_section,
+                                              offset_in_output_section,
+                                              view, address, view_size,
+                                              reloc_view, reloc_view_size);
+  else
+    {
+      gold_assert(sh_type == elfcpp::SHT_RELA);
+      this->emit_relocs_reltype<elfcpp::SHT_RELA>(relinfo, i, prelocs,
+                                                 reloc_count, output_section,
+                                                 offset_in_output_section,
+                                                 view, address, view_size,
+                                                 reloc_view, reloc_view_size);
+    }
+}
+
+// Emit the relocs for --emit-relocs, templatized on the type of the
+// relocation section.
+
+template<int size, bool big_endian>
+template<int sh_type>
+void
+Sized_relobj<size, big_endian>::emit_relocs_reltype(
+    const Relocate_info<size, big_endian>* relinfo,
+    unsigned int i,
+    const unsigned char* prelocs,
+    size_t reloc_count,
+    Output_section* output_section,
+    off_t offset_in_output_section,
+    unsigned char* view,
+    typename elfcpp::Elf_types<size>::Elf_Addr address,
+    section_size_type view_size,
+    unsigned char* reloc_view,
+    section_size_type reloc_view_size)
+{
+  const Relocatable_relocs* rr = this->relocatable_relocs(i);
+  relocate_for_relocatable<size, big_endian, sh_type>(
+    relinfo,
+    prelocs,
+    reloc_count,
+    output_section,
+    offset_in_output_section,
+    rr,
+    view,
+    address,
+    view_size,
+    reloc_view,
+    reloc_view_size);
+}
+
+// Create merge hash tables for the local symbols.  These are used to
+// speed up relocations.
+
+template<int size, bool big_endian>
+void
+Sized_relobj<size, big_endian>::initialize_input_to_output_maps()
+{
+  const unsigned int loccount = this->local_symbol_count_;
+  for (unsigned int i = 1; i < loccount; ++i)
+    {
+      Symbol_value<size>& lv(this->local_values_[i]);
+      lv.initialize_input_to_output_map(this);
+    }
+}
+
+// Free merge hash tables for the local symbols.
+
+template<int size, bool big_endian>
+void
+Sized_relobj<size, big_endian>::free_input_to_output_maps()
+{
+  const unsigned int loccount = this->local_symbol_count_;
+  for (unsigned int i = 1; i < loccount; ++i)
+    {
+      Symbol_value<size>& lv(this->local_values_[i]);
+      lv.free_input_to_output_map();
+    }
+}
+
+// Class Merged_symbol_value.
+
+template<int size>
+void
+Merged_symbol_value<size>::initialize_input_to_output_map(
+    const Relobj* object,
+    unsigned int input_shndx)
+{
+  Object_merge_map* map = object->merge_map();
+  map->initialize_input_to_output_map<size>(input_shndx,
+                                           this->output_start_address_,
+                                           &this->output_addresses_);
+}
+
+// Get the output value corresponding to an input offset if we
+// couldn't find it in the hash table.
+
+template<int size>
+typename elfcpp::Elf_types<size>::Elf_Addr
+Merged_symbol_value<size>::value_from_output_section(
+    const Relobj* object,
+    unsigned int input_shndx,
+    typename elfcpp::Elf_types<size>::Elf_Addr input_offset) const
+{
+  section_offset_type output_offset;
+  bool found = object->merge_map()->get_output_offset(NULL, input_shndx,
+                                                     input_offset,
+                                                     &output_offset);
+
+  // If this assertion fails, it means that some relocation was
+  // against a portion of an input merge section which we didn't map
+  // to the output file and we didn't explicitly discard.  We should
+  // always map all portions of input merge sections.
+  gold_assert(found);
+
+  if (output_offset == -1)
+    return 0;
+  else
+    return this->output_start_address_ + output_offset;
+}
+
 // Copy_relocs::Copy_reloc_entry methods.
 
 // Return whether we should emit this reloc.  We should emit it if the
@@ -890,6 +1285,26 @@ Sized_relobj<64, true>::do_relocate(const General_options& options,
                                    Output_file* of);
 #endif
 
+#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
+template
+class Merged_symbol_value<32>;
+#endif
+
+#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
+template
+class Merged_symbol_value<64>;
+#endif
+
+#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
+template
+class Symbol_value<32>;
+#endif
+
+#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
+template
+class Symbol_value<64>;
+#endif
+
 #ifdef HAVE_TARGET_32_LITTLE
 template
 class Copy_relocs<32, false>;
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