gold/target-select.cc

   1 // target-select.cc -- select a target for an object file
   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 #include "gold.h"
  24
  25 #include "elfcpp.h"
  26 #include "target-select.h"
  27
  28 namespace
  29 {
  30
  31 // The start of the list of target selectors.
  32
  33 gold::Target_selector* target_selectors;
  34
  35 } // End anonymous namespace.
  36
  37 namespace gold
  38 {
  39
  40 // Construct a Target_selector, which means adding it to the linked
  41 // list.  This runs at global constructor time, so we want it to be
  42 // fast.
  43
  44 Target_selector::Target_selector(int machine, int size, bool is_big_endian)
  45   : machine_(machine), size_(size), is_big_endian_(is_big_endian)
  46 {
  47   this->next_ = target_selectors;
  48   target_selectors = this;
  49 }
  50
  51 // Find the target for an ELF file.
  52
  53 Target*
  54 select_target(int machine, int size, bool is_big_endian, int osabi,
  55               int abiversion)
  56 {
  57   for (Target_selector* p = target_selectors; p != NULL; p = p->next())
  58     {
  59       int pmach = p->machine();
  60       if ((pmach == machine || pmach == elfcpp::EM_NONE)
  61           && p->get_size() == size
  62           && (p->is_big_endian() ? is_big_endian : !is_big_endian))
  63         {
  64           Target* ret = p->recognize(machine, osabi, abiversion);
  65           if (ret != NULL)
  66             return ret;
  67         }
  68     }
  69   return NULL;
  70 }
  71
  72 // Find a target using a BFD name.  This is used to support the
  73 // --oformat option.
  74
  75 Target*
  76 select_target_by_name(const char* name)
  77 {
  78   for (Target_selector* p = target_selectors; p != NULL; p = p->next())
  79     {
  80       Target* ret = p->recognize_by_name(name);
  81       if (ret != NULL)
  82         return ret;
  83     }
  84   return NULL;
  85 }
  86
  87 } // End namespace gold.