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                                  const char* bfd_name)
  46   : machine_(machine), size_(size), is_big_endian_(is_big_endian),
  47     bfd_name_(bfd_name), instantiated_target_(NULL)
  48
  49 {
  50   this->next_ = target_selectors;
  51   target_selectors = this;
  52 }
  53
  54 // Find the target for an ELF file.
  55
  56 Target*
  57 select_target(int machine, int size, bool is_big_endian, int osabi,
  58               int abiversion)
  59 {
  60   for (Target_selector* p = target_selectors; p != NULL; p = p->next())
  61     {
  62       int pmach = p->machine();
  63       if ((pmach == machine || pmach == elfcpp::EM_NONE)
  64           && p->get_size() == size
  65           && (p->is_big_endian() ? is_big_endian : !is_big_endian))
  66         {
  67           Target* ret = p->recognize(machine, osabi, abiversion);
  68           if (ret != NULL)
  69             return ret;
  70         }
  71     }
  72   return NULL;
  73 }
  74
  75 // Find a target using a BFD name.  This is used to support the
  76 // --oformat option.
  77
  78 Target*
  79 select_target_by_name(const char* name)
  80 {
  81   for (Target_selector* p = target_selectors; p != NULL; p = p->next())
  82     {
  83       const char* pname = p->bfd_name();
  84       if (pname == NULL || strcmp(pname, name) == 0)
  85         {
  86           Target* ret = p->recognize_by_name(name);
  87           if (ret != NULL)
  88             return ret;
  89         }
  90     }
  91   return NULL;
  92 }
  93
  94 // Push all the supported BFD names onto a vector.
  95
  96 void
  97 supported_target_names(std::vector<const char*>* names)
  98 {
  99   for (Target_selector* p = target_selectors; p != NULL; p = p->next())
 100     p->supported_names(names);
 101 }
 102
 103 } // End namespace gold.