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 <cstring>
  26
  27 #include "elfcpp.h"
  28 #include "target-select.h"
  29
  30 namespace
  31 {
  32
  33 // The start of the list of target selectors.
  34
  35 gold::Target_selector* target_selectors;
  36
  37 } // End anonymous namespace.
  38
  39 namespace gold
  40 {
  41
  42 // Construct a Target_selector, which means adding it to the linked
  43 // list.  This runs at global constructor time, so we want it to be
  44 // fast.
  45
  46 Target_selector::Target_selector(int machine, int size, bool is_big_endian,
  47                                  const char* bfd_name)
  48   : machine_(machine), size_(size), is_big_endian_(is_big_endian),
  49     bfd_name_(bfd_name), instantiated_target_(NULL)
  50
  51 {
  52   this->next_ = target_selectors;
  53   target_selectors = this;
  54 }
  55
  56 // Find the target for an ELF file.
  57
  58 Target*
  59 select_target(int machine, int size, bool is_big_endian, int osabi,
  60               int abiversion)
  61 {
  62   for (Target_selector* p = target_selectors; p != NULL; p = p->next())
  63     {
  64       int pmach = p->machine();
  65       if ((pmach == machine || pmach == elfcpp::EM_NONE)
  66           && p->get_size() == size
  67           && (p->is_big_endian() ? is_big_endian : !is_big_endian))
  68         {
  69           Target* ret = p->recognize(machine, osabi, abiversion);
  70           if (ret != NULL)
  71             return ret;
  72         }
  73     }
  74   return NULL;
  75 }
  76
  77 // Find a target using a BFD name.  This is used to support the
  78 // --oformat option.
  79
  80 Target*
  81 select_target_by_name(const char* name)
  82 {
  83   for (Target_selector* p = target_selectors; p != NULL; p = p->next())
  84     {
  85       const char* pname = p->bfd_name();
  86       if (pname == NULL || strcmp(pname, name) == 0)
  87         {
  88           Target* ret = p->recognize_by_name(name);
  89           if (ret != NULL)
  90             return ret;
  91         }
  92     }
  93   return NULL;
  94 }
  95
  96 // Push all the supported BFD names onto a vector.
  97
  98 void
  99 supported_target_names(std::vector<const char*>* names)
 100 {
 101   for (Target_selector* p = target_selectors; p != NULL; p = p->next())
 102     p->supported_names(names);
 103 }
 104
 105 } // End namespace gold.