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Diffstat (limited to 'binutils-2.25/gold/parameters.cc')
| -rw-r--r-- | binutils-2.25/gold/parameters.cc | 389 |
1 files changed, 389 insertions, 0 deletions
diff --git a/binutils-2.25/gold/parameters.cc b/binutils-2.25/gold/parameters.cc new file mode 100644 index 00000000..7410e7f8 --- /dev/null +++ b/binutils-2.25/gold/parameters.cc @@ -0,0 +1,389 @@ +// parameters.cc -- general parameters for a link using gold + +// Copyright 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 +// 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; + 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) + 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); + target->select_as_default_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. |