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// target-select.cc -- select a target for an object file
// Copyright 2006, 2007, 2008 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 <cstring>
#include "elfcpp.h"
#include "target-select.h"
namespace
{
// The start of the list of target selectors.
gold::Target_selector* target_selectors;
} // End anonymous namespace.
namespace gold
{
// 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)
: machine_(machine), size_(size), is_big_endian_(is_big_endian),
bfd_name_(bfd_name), instantiated_target_(NULL), lock_(NULL),
initialize_lock_(&this->lock_)
{
this->next_ = target_selectors;
target_selectors = this;
}
// Instantiate the target and return it. Use a lock to avoid
// instantiating two instances of the same target.
Target*
Target_selector::instantiate_target()
{
// We assume that the pointer will either be written entirely or not
// at all.
if (this->instantiated_target_ == NULL)
{
this->initialize_lock_.initialize();
Hold_optional_lock hl(this->lock_);
if (this->instantiated_target_ == NULL)
this->instantiated_target_ = this->do_instantiate_target();
}
return this->instantiated_target_;
}
// Find the target for an ELF file.
Target*
select_target(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(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_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_name(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_names(names);
}
} // End namespace gold.
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