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[/] [openrisc/] [trunk/] [gnu-src/] [binutils-2.20.1/] [gold/] [target-select.h] - Blame information for rev 233

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// target-select.h -- select a target for an object file  -*- C++ -*-
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// Copyright 2006, 2007, 2008 Free Software Foundation, Inc.
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// Written by Ian Lance Taylor <iant@google.com>.
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// This file is part of gold.
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 3 of the License, or
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// (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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// MA 02110-1301, USA.
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#ifndef GOLD_TARGET_SELECT_H
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#define GOLD_TARGET_SELECT_H
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#include <vector>
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#include "gold-threads.h"
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namespace gold
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{
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class Target;
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// We want to avoid a master list of targets, which implies using a
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// global constructor.  And we also want the program to start up as
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// quickly as possible, which implies avoiding global constructors.
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// We compromise on a very simple global constructor.  We use a target
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// selector, which specifies an ELF machine number and a recognition
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// function.  We use global constructors to build a linked list of
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// target selectors--a simple pointer list, not a std::list.
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class Target_selector
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{
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 public:
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  // Create a target selector for a specific machine number, size (32
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  // or 64), and endianness.  The machine number can be EM_NONE to
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  // test for any machine number.  BFD_NAME is the name of the target
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  // used by the GNU linker, for backward compatibility; it may be
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  // NULL.
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  Target_selector(int machine, int size, bool is_big_endian,
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                  const char* bfd_name);
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  virtual ~Target_selector()
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  { }
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  // If we can handle this target, return a pointer to a target
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  // structure.  The size and endianness are known.
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  Target*
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  recognize(int machine, int osabi, int abiversion)
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  { return this->do_recognize(machine, osabi, abiversion); }
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  // If NAME matches the target, return a pointer to a target
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  // structure.
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  Target*
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  recognize_by_name(const char* name)
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  { return this->do_recognize_by_name(name); }
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  // Push all supported names onto the vector.  This is only used for
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  // help output.
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  void
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  supported_names(std::vector<const char*>* names)
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  { this->do_supported_names(names); }
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  // Return the next Target_selector in the linked list.
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  Target_selector*
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  next() const
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  { return this->next_; }
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  // Return the machine number this selector is looking for.  This can
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  // be EM_NONE to match any machine number, in which case the
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  // do_recognize hook will be responsible for matching the machine
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  // number.
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  int
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  machine() const
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  { return this->machine_; }
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  // Return the size this is looking for (32 or 64).
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  int
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  get_size() const
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  { return this->size_; }
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  // Return the endianness this is looking for.
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  bool
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  is_big_endian() const
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  { return this->is_big_endian_; }
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  // Return the BFD name.  This may return NULL, in which case the
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  // do_recognize_by_name hook will be responsible for matching the
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  // BFD name.
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  const char*
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  bfd_name() const
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  { return this->bfd_name_; }
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 protected:
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  // Return an instance of the real target.  This must be implemented
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  // by the child class.
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  virtual Target*
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  do_instantiate_target() = 0;
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  // Recognize an object file given a machine code, OSABI code, and
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  // ELF version value.  When this is called we already know that they
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  // match the machine_, size_, and is_big_endian_ fields.  The child
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  // class may implement a different version of this to do additional
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  // checks, or to check for multiple machine codes if the machine_
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  // field is EM_NONE.
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  virtual Target*
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  do_recognize(int, int, int)
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  { return this->instantiate_target(); }
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  // Recognize a target by name.  When this is called we already know
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  // that the name matches (or that the bfd_name_ field is NULL).  The
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  // child class may implement a different version of this to
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  // recognize more than one name.
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  virtual Target*
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  do_recognize_by_name(const char*)
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  { return this->instantiate_target(); }
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  // Return a list of supported BFD names.  The child class may
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  // implement a different version of this to handle more than one
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  // name.
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  virtual void
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  do_supported_names(std::vector<const char*>* names)
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  {
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    gold_assert(this->bfd_name_ != NULL);
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    names->push_back(this->bfd_name_);
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  }
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  // Instantiate the target and return it.
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  Target*
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  instantiate_target();
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 private:
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  // ELF machine code.
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  const int machine_;
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  // Target size--32 or 64.
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  const int size_;
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  // Whether the target is big endian.
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  const bool is_big_endian_;
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  // BFD name of target, for compatibility.
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  const char* const bfd_name_;
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  // Next entry in list built at global constructor time.
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  Target_selector* next_;
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  // The singleton Target structure--this points to an instance of the
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  // real implementation.
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  Target* instantiated_target_;
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  // Lock to make sure that we don't instantiate the target more than
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  // once.
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  Lock* lock_;
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  // We only want to initialize the lock_ pointer once.
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  Initialize_lock initialize_lock_;
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};
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// Select the target for an ELF file.
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extern Target*
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select_target(int machine, int size, bool big_endian, int osabi,
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              int abiversion);
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// Select a target using a BFD name.
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extern Target*
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select_target_by_name(const char* name);
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// Fill in a vector with the list of supported targets.  This returns
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// a list of BFD names.
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extern void
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supported_target_names(std::vector<const char*>*);
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} // End namespace gold.
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#endif // !defined(GOLD_TARGET_SELECT_H)

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