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Diffstat (limited to 'binutils-2.25/gold/target-select.cc')
-rw-r--r-- | binutils-2.25/gold/target-select.cc | 220 |
1 files changed, 220 insertions, 0 deletions
diff --git a/binutils-2.25/gold/target-select.cc b/binutils-2.25/gold/target-select.cc new file mode 100644 index 00000000..e17cb7d4 --- /dev/null +++ b/binutils-2.25/gold/target-select.cc @@ -0,0 +1,220 @@ +// 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 = ¶meters->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. |