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+// target-select.cc -- select a target for an object file
+
+// Copyright 2006, 2007, 2008, 2009, 2010, 2011, 2012
+// Free Software Foundation, Inc.
+// Written by Ian Lance Taylor <iant@google.com>.
+
+// This file is part of gold.
+
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
+// MA 02110-1301, USA.
+
+#include "gold.h"
+
+#include <cstdio>
+#include <cstring>
+
+#include "elfcpp.h"
+#include "options.h"
+#include "parameters.h"
+#include "target-select.h"
+
+namespace
+{
+
+// The start of the list of target selectors.
+
+gold::Target_selector* target_selectors;
+
+} // End anonymous namespace.
+
+namespace gold
+{
+
+// Class Set_target_once.
+
+void
+Set_target_once::do_run_once(void*)
+{
+ this->target_selector_->set_target();
+}
+
+// Construct a Target_selector, which means adding it to the linked
+// list. This runs at global constructor time, so we want it to be
+// fast.
+
+Target_selector::Target_selector(int machine, int size, bool is_big_endian,
+ const char* bfd_name, const char* emulation)
+ : machine_(machine), size_(size), is_big_endian_(is_big_endian),
+ bfd_name_(bfd_name), emulation_(emulation), instantiated_target_(NULL),
+ set_target_once_(this)
+{
+ this->next_ = target_selectors;
+ target_selectors = this;
+}
+
+// Instantiate the target and return it. Use SET_TARGET_ONCE_ to
+// avoid instantiating two instances of the same target.
+
+Target*
+Target_selector::instantiate_target()
+{
+ this->set_target_once_.run_once(NULL);
+ return this->instantiated_target_;
+}
+
+// Instantiate the target. This is called at most once.
+
+void
+Target_selector::set_target()
+{
+ gold_assert(this->instantiated_target_ == NULL);
+ this->instantiated_target_ = this->do_instantiate_target();
+}
+
+// If we instantiated TARGET, return the corresponding BFD name.
+
+const char*
+Target_selector::do_target_bfd_name(const Target* target)
+{
+ if (!this->is_our_target(target))
+ return NULL;
+ const char* my_bfd_name = this->bfd_name();
+ gold_assert(my_bfd_name != NULL);
+ return my_bfd_name;
+}
+
+// Find the target for an ELF file.
+
+Target*
+select_target(Input_file* input_file, off_t offset,
+ int machine, int size, bool is_big_endian,
+ int osabi, int abiversion)
+{
+ for (Target_selector* p = target_selectors; p != NULL; p = p->next())
+ {
+ int pmach = p->machine();
+ if ((pmach == machine || pmach == elfcpp::EM_NONE)
+ && p->get_size() == size
+ && (p->is_big_endian() ? is_big_endian : !is_big_endian))
+ {
+ Target* ret = p->recognize(input_file, offset,
+ machine, osabi, abiversion);
+ if (ret != NULL)
+ return ret;
+ }
+ }
+ return NULL;
+}
+
+// Find a target using a BFD name. This is used to support the
+// --oformat option.
+
+Target*
+select_target_by_bfd_name(const char* name)
+{
+ for (Target_selector* p = target_selectors; p != NULL; p = p->next())
+ {
+ const char* pname = p->bfd_name();
+ if (pname == NULL || strcmp(pname, name) == 0)
+ {
+ Target* ret = p->recognize_by_bfd_name(name);
+ if (ret != NULL)
+ return ret;
+ }
+ }
+ return NULL;
+}
+
+// Find a target using a GNU linker emulation. This is used to
+// support the -m option.
+
+Target*
+select_target_by_emulation(const char* name)
+{
+ for (Target_selector* p = target_selectors; p != NULL; p = p->next())
+ {
+ const char* pname = p->emulation();
+ if (pname == NULL || strcmp(pname, name) == 0)
+ {
+ Target* ret = p->recognize_by_emulation(name);
+ if (ret != NULL)
+ return ret;
+ }
+ }
+ return NULL;
+}
+
+// Push all the supported BFD names onto a vector.
+
+void
+supported_target_names(std::vector<const char*>* names)
+{
+ for (Target_selector* p = target_selectors; p != NULL; p = p->next())
+ p->supported_bfd_names(names);
+}
+
+// Push all the supported emulations onto a vector.
+
+void
+supported_emulation_names(std::vector<const char*>* names)
+{
+ for (Target_selector* p = target_selectors; p != NULL; p = p->next())
+ p->supported_emulations(names);
+}
+
+// Implement the --print-output-format option.
+
+void
+print_output_format()
+{
+ if (!parameters->target_valid())
+ {
+ // This case arises when --print-output-format is used with no
+ // input files. We need to come up with the right string to
+ // print based on the other options. If the user specified the
+ // format using a --oformat option, use that. That saves each
+ // target from having to remember the name that was used to
+ // select it. In other cases, we will just have to ask the
+ // target.
+ if (parameters->options().user_set_oformat())
+ {
+ const char* bfd_name = parameters->options().oformat();
+ Target* target = select_target_by_bfd_name(bfd_name);
+ if (target != NULL)
+ printf("%s\n", bfd_name);
+ else
+ gold_error(_("unrecognized output format %s"), bfd_name);
+ return;
+ }
+
+ parameters_force_valid_target();
+ }
+
+ const Target* target = &parameters->target();
+ for (Target_selector* p = target_selectors; p != NULL; p = p->next())
+ {
+ const char* bfd_name = p->target_bfd_name(target);
+ if (bfd_name != NULL)
+ {
+ printf("%s\n", bfd_name);
+ return;
+ }
+ }
+
+ gold_unreachable();
+}
+
+} // End namespace gold.