// 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.