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// cref.cc -- cross reference for gold

// Copyright 2008 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.

#include "gold.h"

#include <cerrno>

#include <cstdio>

#include <cstring>

#include <map>

#include <string>

#include <vector>

#include "object.h"

#include "archive.h"

#include "cref.h"

namespace gold

{

// Class Cref_inputs.  This is used to hold the list of input files

// for cross referencing.

class Cref_inputs

{

 public:

  Cref_inputs()

    : objects_(), archives_(), current_(&this->objects_)

  { }

  // Add an input object file.

  void

  add_object(Object* object);

  // Start adding an archive.  We support nested archives for future

  // flexibility.

  void

  add_archive_start(Archive*);

  // Finish adding an archive.

  void

  add_archive_stop(Archive*);

  // Report symbol counts.

  void

  print_symbol_counts(const Symbol_table*, FILE*) const;

 private:

  // A list of input objects.

  typedef std::vector<Object*> Objects;

  // Information we record for an archive.

  struct Archive_info

  {

    // Archive name.

    std::string name;

    // List of objects included from the archive.

    Objects* objects;

    // Number of archive members.

    size_t member_count;

  };

  // A mapping from the name of an archive to the list of objects in

  // that archive.

  typedef std::map<std::string, Archive_info> Archives;

  // Report symbol counts for a list of Objects.

  void

  print_objects_symbol_counts(const Symbol_table*, FILE*, const Objects*) const;

  // Report symbol counts for an object.

  void

  print_object_symbol_counts(const Symbol_table*, FILE*, const Object*) const;

  // List of input objects.

  Objects objects_;

  // List of input archives.  This is a mapping from the archive file

  // name to the list of objects.

  Archives archives_;

  // The list to which we are currently adding objects.

  Objects* current_;

};

// Add an object.

void

Cref_inputs::add_object(Object* object)

{

  this->current_->push_back(object);

}

// Start adding an archive.

void

Cref_inputs::add_archive_start(Archive* archive)

{

  gold_assert(this->current_ == &this->objects_);

  if (this->archives_.find(archive->name()) == this->archives_.end())

    {

      Archive_info* pai = &this->archives_[archive->name()];

      pai->name = archive->filename();

      pai->objects = new Objects();

      pai->member_count = archive->count_members();

    }

  this->current_ = this->archives_[archive->name()].objects;

}

// Stop adding an archive.

void

Cref_inputs::add_archive_stop(Archive*)

{

  gold_assert(this->current_ != &this->objects_);

  this->current_ = &this->objects_;

}

// Report symbol counts for an object.

void

Cref_inputs::print_object_symbol_counts(const Symbol_table* symtab,

                                        FILE* f,

                                        const Object* object) const

{

  size_t defined, used;

  object->get_global_symbol_counts(symtab, &defined, &used);

  fprintf(f, "symbols %s %zu %zu\n", object->name().c_str(), defined, used);

}

// Report symbol counts for a list of Inputs.

void

Cref_inputs::print_objects_symbol_counts(const Symbol_table* symtab,

                                         FILE* f,

                                         const Objects* objects) const

{

  for (Objects::const_iterator p = objects->begin();

       p != objects->end();

       ++p)

    this->print_object_symbol_counts(symtab, f, *p);

}

// Print symbol counts.  This implements --print-symbol-counts.  This

// is intended to be easily read by a program.  This outputs a series

// of lines.  There are two different types of lines.

// The first is "symbols FILENAME DEFINED USED".  FILENAME is the name

// of an object file included in the link; for an archive, this will

// be ARCHIVEFILENAME(MEMBERNAME).  DEFINED is the number of symbols

// which the object file defines.  USED is the number of symbols which

// are used in the final output; this is the number of symbols which

// appear in the final output table as having been defined by this

// object.  These numbers will be different when weak symbols are

// used, and they will be different for dynamic objects.

// The second is "archives FILENAME MEMBERS USED".  FILENAME is the

// name of an archive file included in the link.  MEMBERS is the

// number of members of the archive.  USED is the number of archive

// members included in the link.

void

Cref_inputs::print_symbol_counts(const Symbol_table* symtab, FILE* f) const

{

  this->print_objects_symbol_counts(symtab, f, &this->objects_);

  for (Archives::const_iterator p = this->archives_.begin();

       p != this->archives_.end();

       ++p)

    {

      fprintf(f, "archive %s %zu %zu\n", p->second.name.c_str(),

             p->second.member_count, p->second.objects->size());

      this->print_objects_symbol_counts(symtab, f, p->second.objects);

    }

}

// Class Cref.

// Make sure the Cref_inputs object has been created.

void

Cref::need_inputs()

{

  if (this->inputs_ == NULL)

    this->inputs_ = new Cref_inputs();

}

// Add an input object file.

void

Cref::add_object(Object* object)

{

  this->need_inputs();

  this->inputs_->add_object(object);

}

// Start adding an archive.

void

Cref::add_archive_start(Archive* archive)

{

  this->need_inputs();

  this->inputs_->add_archive_start(archive);

}

// Stop adding an archive.

void

Cref::add_archive_stop(Archive* archive)

{

  this->inputs_->add_archive_stop(archive);

}

// Print symbol counts.

void

Cref::print_symbol_counts(const Symbol_table* symtab) const

{

  if (parameters->options().user_set_print_symbol_counts()

      && this->inputs_ != NULL)

    {

      FILE* f;

      if (strcmp(parameters->options().print_symbol_counts(), "-") == 0)

        f = stdout;

      else

        {

          f = fopen(parameters->options().print_symbol_counts(), "w");

          if (f == NULL)

            gold_error(_("cannot open symbol count file %s: %s"),

                       parameters->options().print_symbol_counts(),

                       strerror(errno));

        }

      if (f != NULL)

        this->inputs_->print_symbol_counts(symtab, f);

    }

}

} // End namespace gold.