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- // parameters.cc -- general parameters for a link using gold
- // Copyright (C) 2006-2022 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 "debug.h"
- #include "options.h"
- #include "target.h"
- #include "target-select.h"
- namespace gold
- {
- // Our local version of the variable, which is not const.
- static Parameters static_parameters;
- // The global variable.
- const Parameters* parameters = &static_parameters;
- // A helper class to set the target once.
- class Set_parameters_target_once : public Once
- {
- public:
- Set_parameters_target_once(Parameters* parameters)
- : parameters_(parameters)
- { }
- protected:
- void
- do_run_once(void* arg)
- { this->parameters_->set_target_once(static_cast<Target*>(arg)); }
- private:
- Parameters* parameters_;
- };
- // We only need one Set_parameters_target_once.
- static
- Set_parameters_target_once set_parameters_target_once(&static_parameters);
- // Class Parameters.
- Parameters::Parameters()
- : errors_(NULL), timer_(NULL), options_(NULL), target_(NULL),
- doing_static_link_valid_(false), doing_static_link_(false),
- debug_(0), incremental_mode_(General_options::INCREMENTAL_OFF),
- set_parameters_target_once_(&set_parameters_target_once)
- {
- }
- void
- Parameters::set_errors(Errors* errors)
- {
- gold_assert(this->errors_ == NULL);
- this->errors_ = errors;
- }
- void
- Parameters::set_timer(Timer* timer)
- {
- gold_assert(this->timer_ == NULL);
- this->timer_ = timer;
- }
- void
- Parameters::set_options(const General_options* options)
- {
- gold_assert(!this->options_valid());
- this->options_ = options;
- // For speed, we convert the options() debug var from a string to an
- // enum (from debug.h).
- this->debug_ = debug_string_to_enum(this->options().debug());
- // Set incremental_mode_ based on the value of the --incremental option.
- // We copy the mode into parameters because it can change based on inputs.
- this->incremental_mode_ = this->options().incremental_mode();
- // If --verbose is set, it acts as "--debug=files".
- if (options->verbose())
- this->debug_ |= DEBUG_FILES;
- if (this->target_valid())
- this->check_target_endianness();
- }
- void
- Parameters::set_doing_static_link(bool doing_static_link)
- {
- gold_assert(!this->doing_static_link_valid_);
- this->doing_static_link_ = doing_static_link;
- this->doing_static_link_valid_ = true;
- }
- void
- Parameters::set_target(Target* target)
- {
- this->set_parameters_target_once_->run_once(static_cast<void*>(target));
- gold_assert(target == this->target_);
- }
- // This is called at most once.
- void
- Parameters::set_target_once(Target* target)
- {
- gold_assert(this->target_ == NULL);
- this->target_ = target;
- target->select_as_default_target();
- if (this->options_valid())
- {
- this->check_target_endianness();
- this->check_rodata_segment();
- }
- }
- // Clear the target, for testing.
- void
- Parameters::clear_target()
- {
- this->target_ = NULL;
- // We need a new Set_parameters_target_once so that we can set the
- // target again.
- this->set_parameters_target_once_ = new Set_parameters_target_once(this);
- }
- // Return whether TARGET is compatible with the target we are using.
- bool
- Parameters::is_compatible_target(const Target* target) const
- {
- if (this->target_ == NULL)
- return true;
- return target == this->target_;
- }
- Parameters::Target_size_endianness
- Parameters::size_and_endianness() const
- {
- if (this->target().get_size() == 32)
- {
- if (!this->target().is_big_endian())
- {
- #ifdef HAVE_TARGET_32_LITTLE
- return TARGET_32_LITTLE;
- #else
- gold_unreachable();
- #endif
- }
- else
- {
- #ifdef HAVE_TARGET_32_BIG
- return TARGET_32_BIG;
- #else
- gold_unreachable();
- #endif
- }
- }
- else if (parameters->target().get_size() == 64)
- {
- if (!parameters->target().is_big_endian())
- {
- #ifdef HAVE_TARGET_64_LITTLE
- return TARGET_64_LITTLE;
- #else
- gold_unreachable();
- #endif
- }
- else
- {
- #ifdef HAVE_TARGET_64_BIG
- return TARGET_64_BIG;
- #else
- gold_unreachable();
- #endif
- }
- }
- else
- gold_unreachable();
- }
- // If output endianness is specified in command line, check that it does
- // not conflict with the target.
- void
- Parameters::check_target_endianness()
- {
- General_options::Endianness endianness = this->options().endianness();
- if (endianness != General_options::ENDIANNESS_NOT_SET)
- {
- bool big_endian;
- if (endianness == General_options::ENDIANNESS_BIG)
- big_endian = true;
- else
- {
- gold_assert(endianness == General_options::ENDIANNESS_LITTLE);
- big_endian = false;;
- }
- if (this->target().is_big_endian() != big_endian)
- gold_error(_("input file does not match -EB/EL option"));
- }
- }
- void
- Parameters::check_rodata_segment()
- {
- if (this->options().user_set_Trodata_segment()
- && !this->options().rosegment()
- && !this->target().isolate_execinstr())
- gold_error(_("-Trodata-segment is meaningless without --rosegment"));
- }
- // Return the name of the entry symbol.
- const char*
- Parameters::entry() const
- {
- const char* ret = this->options().entry();
- if (ret == NULL && parameters->target_valid())
- ret = parameters->target().entry_symbol_name();
- return ret;
- }
- // Set the incremental linking mode to INCREMENTAL_FULL. Used when
- // the linker determines that an incremental update is not possible.
- // Returns false if the incremental mode was INCREMENTAL_UPDATE,
- // indicating that the linker should exit if an update is not possible.
- bool
- Parameters::set_incremental_full()
- {
- gold_assert(this->incremental_mode_ != General_options::INCREMENTAL_OFF);
- if (this->incremental_mode_ == General_options::INCREMENTAL_UPDATE)
- return false;
- this->incremental_mode_ = General_options::INCREMENTAL_FULL;
- return true;
- }
- // Return true if we need to prepare incremental linking information.
- bool
- Parameters::incremental() const
- {
- return this->incremental_mode_ != General_options::INCREMENTAL_OFF;
- }
- // Return true if we are doing a full incremental link.
- bool
- Parameters::incremental_full() const
- {
- return this->incremental_mode_ == General_options::INCREMENTAL_FULL;
- }
- // Return true if we are doing an incremental update.
- bool
- Parameters::incremental_update() const
- {
- return (this->incremental_mode_ == General_options::INCREMENTAL_UPDATE
- || this->incremental_mode_ == General_options::INCREMENTAL_AUTO);
- }
- void
- set_parameters_errors(Errors* errors)
- { static_parameters.set_errors(errors); }
- void
- set_parameters_timer(Timer* timer)
- { static_parameters.set_timer(timer); }
- void
- set_parameters_options(const General_options* options)
- { static_parameters.set_options(options); }
- void
- set_parameters_target(Target* target)
- {
- static_parameters.set_target(target);
- }
- void
- set_parameters_doing_static_link(bool doing_static_link)
- { static_parameters.set_doing_static_link(doing_static_link); }
- // Set the incremental linking mode to INCREMENTAL_FULL. Used when
- // the linker determines that an incremental update is not possible.
- // Returns false if the incremental mode was INCREMENTAL_UPDATE,
- // indicating that the linker should exit if an update is not possible.
- bool
- set_parameters_incremental_full()
- { return static_parameters.set_incremental_full(); }
- // Force the target to be valid by using the default. Use the
- // --oformat option is set; this supports the x86_64 kernel build,
- // which converts a binary file to an object file using -r --format
- // binary --oformat elf32-i386 foo.o. Otherwise use the configured
- // default.
- void
- parameters_force_valid_target()
- {
- if (parameters->target_valid())
- return;
- gold_assert(parameters->options_valid());
- 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)
- {
- set_parameters_target(target);
- return;
- }
- gold_error(_("unrecognized output format %s"), bfd_name);
- }
- if (parameters->options().user_set_m())
- {
- const char* emulation = parameters->options().m();
- Target* target = select_target_by_emulation(emulation);
- if (target != NULL)
- {
- set_parameters_target(target);
- return;
- }
- gold_error(_("unrecognized emulation %s"), emulation);
- }
- // The GOLD_DEFAULT_xx macros are defined by the configure script.
- bool is_big_endian;
- General_options::Endianness endianness = parameters->options().endianness();
- if (endianness == General_options::ENDIANNESS_BIG)
- is_big_endian = true;
- else if (endianness == General_options::ENDIANNESS_LITTLE)
- is_big_endian = false;
- else
- is_big_endian = GOLD_DEFAULT_BIG_ENDIAN;
- Target* target = select_target(NULL, 0,
- elfcpp::GOLD_DEFAULT_MACHINE,
- GOLD_DEFAULT_SIZE,
- is_big_endian,
- elfcpp::GOLD_DEFAULT_OSABI,
- 0);
- if (target == NULL)
- {
- gold_assert(is_big_endian != GOLD_DEFAULT_BIG_ENDIAN);
- gold_fatal(_("no supported target for -EB/-EL option"));
- }
- set_parameters_target(target);
- }
- // Clear the current target, for testing.
- void
- parameters_clear_target()
- {
- static_parameters.clear_target();
- }
- } // End namespace gold.
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