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// parameters.cc -- general parameters for a link using gold
// Copyright (C) 2006-2021 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.