upload android base code part8
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android/toolchain/binutils/binutils-2.25/gold/parameters.cc
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388
android/toolchain/binutils/binutils-2.25/gold/parameters.cc
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// parameters.cc -- general parameters for a link using gold
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// Copyright (C) 2006-2014 Free Software Foundation, Inc.
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// Written by Ian Lance Taylor <iant@google.com>.
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// This file is part of gold.
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 3 of the License, or
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// (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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// MA 02110-1301, USA.
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#include "gold.h"
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#include "debug.h"
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#include "options.h"
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#include "target.h"
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#include "target-select.h"
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namespace gold
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{
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// Our local version of the variable, which is not const.
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static Parameters static_parameters;
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// The global variable.
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const Parameters* parameters = &static_parameters;
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// A helper class to set the target once.
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class Set_parameters_target_once : public Once
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{
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public:
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Set_parameters_target_once(Parameters* parameters)
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: parameters_(parameters)
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{ }
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protected:
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void
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do_run_once(void* arg)
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{ this->parameters_->set_target_once(static_cast<Target*>(arg)); }
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private:
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Parameters* parameters_;
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};
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// We only need one Set_parameters_target_once.
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static
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Set_parameters_target_once set_parameters_target_once(&static_parameters);
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// Class Parameters.
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Parameters::Parameters()
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: errors_(NULL), timer_(NULL), options_(NULL), target_(NULL),
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doing_static_link_valid_(false), doing_static_link_(false),
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debug_(0), incremental_mode_(General_options::INCREMENTAL_OFF),
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set_parameters_target_once_(&set_parameters_target_once)
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{
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}
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void
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Parameters::set_errors(Errors* errors)
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{
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gold_assert(this->errors_ == NULL);
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this->errors_ = errors;
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}
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void
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Parameters::set_timer(Timer* timer)
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{
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gold_assert(this->timer_ == NULL);
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this->timer_ = timer;
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}
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void
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Parameters::set_options(const General_options* options)
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{
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gold_assert(!this->options_valid());
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this->options_ = options;
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// For speed, we convert the options() debug var from a string to an
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// enum (from debug.h).
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this->debug_ = debug_string_to_enum(this->options().debug());
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// Set incremental_mode_ based on the value of the --incremental option.
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// We copy the mode into parameters because it can change based on inputs.
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this->incremental_mode_ = this->options().incremental_mode();
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// If --verbose is set, it acts as "--debug=files".
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if (options->verbose())
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this->debug_ |= DEBUG_FILES;
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if (this->target_valid())
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this->check_target_endianness();
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}
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void
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Parameters::set_doing_static_link(bool doing_static_link)
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{
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gold_assert(!this->doing_static_link_valid_);
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this->doing_static_link_ = doing_static_link;
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this->doing_static_link_valid_ = true;
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}
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void
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Parameters::set_target(Target* target)
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{
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this->set_parameters_target_once_->run_once(static_cast<void*>(target));
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gold_assert(target == this->target_);
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}
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// This is called at most once.
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void
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Parameters::set_target_once(Target* target)
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{
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gold_assert(this->target_ == NULL);
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this->target_ = target;
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target->select_as_default_target();
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if (this->options_valid())
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{
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this->check_target_endianness();
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this->check_rodata_segment();
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}
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}
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// Clear the target, for testing.
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void
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Parameters::clear_target()
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{
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this->target_ = NULL;
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// We need a new Set_parameters_target_once so that we can set the
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// target again.
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this->set_parameters_target_once_ = new Set_parameters_target_once(this);
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}
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// Return whether TARGET is compatible with the target we are using.
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bool
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Parameters::is_compatible_target(const Target* target) const
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{
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if (this->target_ == NULL)
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return true;
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return target == this->target_;
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}
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Parameters::Target_size_endianness
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Parameters::size_and_endianness() const
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{
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if (this->target().get_size() == 32)
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{
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if (!this->target().is_big_endian())
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{
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#ifdef HAVE_TARGET_32_LITTLE
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return TARGET_32_LITTLE;
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#else
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gold_unreachable();
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#endif
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}
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else
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{
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#ifdef HAVE_TARGET_32_BIG
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return TARGET_32_BIG;
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#else
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gold_unreachable();
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#endif
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}
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}
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else if (parameters->target().get_size() == 64)
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{
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if (!parameters->target().is_big_endian())
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{
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#ifdef HAVE_TARGET_64_LITTLE
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return TARGET_64_LITTLE;
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#else
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gold_unreachable();
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#endif
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}
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else
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{
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#ifdef HAVE_TARGET_64_BIG
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return TARGET_64_BIG;
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#else
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gold_unreachable();
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#endif
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}
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}
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else
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gold_unreachable();
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}
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// If output endianness is specified in command line, check that it does
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// not conflict with the target.
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void
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Parameters::check_target_endianness()
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{
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General_options::Endianness endianness = this->options().endianness();
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if (endianness != General_options::ENDIANNESS_NOT_SET)
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{
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bool big_endian;
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if (endianness == General_options::ENDIANNESS_BIG)
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big_endian = true;
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else
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{
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gold_assert(endianness == General_options::ENDIANNESS_LITTLE);
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big_endian = false;;
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}
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if (this->target().is_big_endian() != big_endian)
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gold_error(_("input file does not match -EB/EL option"));
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}
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}
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void
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Parameters::check_rodata_segment()
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{
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if (this->options().user_set_Trodata_segment()
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&& !this->options().rosegment()
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&& !this->target().isolate_execinstr())
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gold_error(_("-Trodata-segment is meaningless without --rosegment"));
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}
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// Return the name of the entry symbol.
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const char*
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Parameters::entry() const
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{
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const char* ret = this->options().entry();
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if (ret == NULL)
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ret = parameters->target().entry_symbol_name();
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return ret;
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}
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// Set the incremental linking mode to INCREMENTAL_FULL. Used when
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// the linker determines that an incremental update is not possible.
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// Returns false if the incremental mode was INCREMENTAL_UPDATE,
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// indicating that the linker should exit if an update is not possible.
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bool
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Parameters::set_incremental_full()
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{
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gold_assert(this->incremental_mode_ != General_options::INCREMENTAL_OFF);
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if (this->incremental_mode_ == General_options::INCREMENTAL_UPDATE)
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return false;
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this->incremental_mode_ = General_options::INCREMENTAL_FULL;
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return true;
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}
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// Return true if we need to prepare incremental linking information.
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bool
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Parameters::incremental() const
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{
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return this->incremental_mode_ != General_options::INCREMENTAL_OFF;
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}
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// Return true if we are doing a full incremental link.
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bool
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Parameters::incremental_full() const
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{
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return this->incremental_mode_ == General_options::INCREMENTAL_FULL;
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}
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// Return true if we are doing an incremental update.
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bool
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Parameters::incremental_update() const
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{
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return (this->incremental_mode_ == General_options::INCREMENTAL_UPDATE
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|| this->incremental_mode_ == General_options::INCREMENTAL_AUTO);
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}
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void
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set_parameters_errors(Errors* errors)
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{ static_parameters.set_errors(errors); }
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void
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set_parameters_timer(Timer* timer)
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{ static_parameters.set_timer(timer); }
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void
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set_parameters_options(const General_options* options)
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{ static_parameters.set_options(options); }
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void
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set_parameters_target(Target* target)
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{
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static_parameters.set_target(target);
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}
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void
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set_parameters_doing_static_link(bool doing_static_link)
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{ static_parameters.set_doing_static_link(doing_static_link); }
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// Set the incremental linking mode to INCREMENTAL_FULL. Used when
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// the linker determines that an incremental update is not possible.
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// Returns false if the incremental mode was INCREMENTAL_UPDATE,
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// indicating that the linker should exit if an update is not possible.
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bool
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set_parameters_incremental_full()
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{ return static_parameters.set_incremental_full(); }
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// Force the target to be valid by using the default. Use the
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// --oformat option is set; this supports the x86_64 kernel build,
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// which converts a binary file to an object file using -r --format
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// binary --oformat elf32-i386 foo.o. Otherwise use the configured
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// default.
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void
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parameters_force_valid_target()
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{
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if (parameters->target_valid())
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return;
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gold_assert(parameters->options_valid());
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if (parameters->options().user_set_oformat())
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{
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const char* bfd_name = parameters->options().oformat();
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Target* target = select_target_by_bfd_name(bfd_name);
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if (target != NULL)
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{
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set_parameters_target(target);
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return;
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}
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gold_error(_("unrecognized output format %s"), bfd_name);
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}
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if (parameters->options().user_set_m())
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{
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const char* emulation = parameters->options().m();
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Target* target = select_target_by_emulation(emulation);
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if (target != NULL)
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{
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set_parameters_target(target);
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return;
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}
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gold_error(_("unrecognized emulation %s"), emulation);
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}
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// The GOLD_DEFAULT_xx macros are defined by the configure script.
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bool is_big_endian;
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General_options::Endianness endianness = parameters->options().endianness();
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if (endianness == General_options::ENDIANNESS_BIG)
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is_big_endian = true;
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else if (endianness == General_options::ENDIANNESS_LITTLE)
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is_big_endian = false;
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else
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is_big_endian = GOLD_DEFAULT_BIG_ENDIAN;
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Target* target = select_target(NULL, 0,
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elfcpp::GOLD_DEFAULT_MACHINE,
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GOLD_DEFAULT_SIZE,
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is_big_endian,
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elfcpp::GOLD_DEFAULT_OSABI,
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0);
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if (target == NULL)
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{
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gold_assert(is_big_endian != GOLD_DEFAULT_BIG_ENDIAN);
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gold_fatal(_("no supported target for -EB/-EL option"));
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}
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set_parameters_target(target);
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}
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// Clear the current target, for testing.
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void
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parameters_clear_target()
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{
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static_parameters.clear_target();
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}
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} // End namespace gold.
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