gold/dirsearch.h

   1 // dirsearch.h -- directory searching 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_DIRSEARCH_H
  24 #define GOLD_DIRSEARCH_H
  25
  26 #include <string>
  27 #include <list>
  28
  29 #include "workqueue.h"
  30
  31 namespace gold
  32 {
  33
  34 class General_options;
  35
  36 // A simple interface to manage directories to be searched for
  37 // libraries.
  38
  39 class Dirsearch
  40 {
  41  public:
  42   Dirsearch();
  43
  44   // Add a directory to the search path.
  45   void
  46   add(Workqueue*, const char*);
  47
  48   // Add a list of directories to the search path.
  49   void
  50   add(Workqueue*, const General_options::Dir_list&);
  51
  52   // Search for a file, giving one or two names to search for (the
  53   // second one may be empty).  Return a full path name for the file,
  54   // or the empty string if it could not be found.  This may only be
  55   // called if the token is not blocked.
  56   std::string
  57   find(const std::string&, const std::string& n2 = std::string()) const;
  58
  59   // Return a reference to the blocker token which controls access.
  60   const Task_token&
  61   token() const
  62   { return this->token_; }
  63
  64  private:
  65   // We can not copy this class.
  66   Dirsearch(const Dirsearch&);
  67   Dirsearch& operator=(const Dirsearch&);
  68
  69   // Directories to search.
  70   std::list<const char*> directories_;
  71   // Blocker token to control access from tasks.
  72   Task_token token_;
  73 };
  74
  75 } // End namespace gold.
  76
  77 #endif // !defined(GOLD_DIRSEARCH_H)