gold/dirsearch.h

   1 // dirsearch.h -- directory searching for gold  -*- C++ -*-
   2
   3 // Copyright 2006, 2007, 2008 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 "options.h"
  30 #include "token.h"
  31
  32 namespace gold
  33 {
  34
  35 class General_options;
  36 class Workqueue;
  37
  38 // A simple interface to manage directories to be searched for
  39 // libraries.
  40
  41 class Dirsearch
  42 {
  43  public:
  44   Dirsearch()
  45     : directories_(NULL), token_(true)
  46   { }
  47
  48   // Set the list of directories to search.
  49   void
  50   initialize(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.  Set *IS_IN_SYSROOT if the
  56   // file was found in a directory which is in the sysroot.  *PINDEX
  57   // should be set to zero the first time this is called; it will be
  58   // updated with the index of the directory where the file is found,
  59   // and that value plus one may be used to find the next file with
  60   // the same name(s).
  61   std::string
  62   find(const std::string&, const std::string& n2, bool* is_in_sysroot,
  63        int* pindex) const;
  64
  65   // Return the blocker token which controls access.
  66   Task_token*
  67   token()
  68   { return &this->token_; }
  69
  70  private:
  71   // We can not copy this class.
  72   Dirsearch(const Dirsearch&);
  73   Dirsearch& operator=(const Dirsearch&);
  74
  75   // Directories to search.
  76   const General_options::Dir_list* directories_;
  77   // Blocker token to control access from tasks.
  78   Task_token token_;
  79 };
  80
  81 } // End namespace gold.
  82
  83 #endif // !defined(GOLD_DIRSEARCH_H)