X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=gold%2Fparameters.cc;h=d677044a079dbbde43a9dd90ad52d5557a6ff5e0;hb=d2d1ea20aef6ed97232280b5e15a52b8d7dc7b7d;hp=2e8bab701aaa2f69ee8388c4d1334718ba9cefef;hpb=2285a61069d360fc56b6cf7371a6fe3ac4e240b7;p=deliverable%2Fbinutils-gdb.git diff --git a/gold/parameters.cc b/gold/parameters.cc index 2e8bab701a..d677044a07 100644 --- a/gold/parameters.cc +++ b/gold/parameters.cc @@ -1,6 +1,6 @@ // parameters.cc -- general parameters for a link using gold -// Copyright 2006, 2007 Free Software Foundation, Inc. +// Copyright (C) 2006-2020 Free Software Foundation, Inc. // Written by Ian Lance Taylor . // This file is part of gold. @@ -30,6 +30,47 @@ 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(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) { @@ -37,6 +78,13 @@ Parameters::set_errors(Errors* errors) 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) { @@ -45,9 +93,14 @@ Parameters::set_options(const General_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 @@ -59,42 +112,46 @@ Parameters::set_doing_static_link(bool doing_static_link) } void -Parameters::set_target(const Target* target) +Parameters::set_target(Target* target) { - if (!this->target_valid()) - this->target_ = target; - else - gold_assert(target == this->target_); + this->set_parameters_target_once_->run_once(static_cast(target)); + gold_assert(target == this->target_); } -// The x86_64 kernel build converts a binary file to an object file -// using -r --format binary --oformat elf32-i386 foo.o. In order to -// support that for gold we support determining the default target -// choice from the output format. We recognize names that the GNU -// linker uses. +// This is called at most once. -const Target& -Parameters::default_target() const +void +Parameters::set_target_once(Target* target) { - gold_assert(this->options_valid()); - if (this->options().user_set_oformat()) + gold_assert(this->target_ == NULL); + this->target_ = target; + target->select_as_default_target(); + if (this->options_valid()) { - const Target* target - = select_target_by_name(this->options().oformat()); - if (target != NULL) - return *target; - - gold_error(_("unrecognized output format %s"), - this->options().oformat()); + this->check_target_endianness(); + this->check_rodata_segment(); } +} - // The GOLD_DEFAULT_xx macros are defined by the configure script. - const Target* target = select_target(elfcpp::GOLD_DEFAULT_MACHINE, - GOLD_DEFAULT_SIZE, - GOLD_DEFAULT_BIG_ENDIAN, - 0, 0); - gold_assert(target != NULL); - return *target; +// 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 @@ -142,29 +199,190 @@ Parameters::size_and_endianness() const gold_unreachable(); } +// If output endianness is specified in command line, check that it does +// not conflict with the target. -// Our local version of the variable, which is not const. +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;; + } -static Parameters static_parameters; + if (this->target().is_big_endian() != big_endian) + gold_error(_("input file does not match -EB/EL option")); + } +} -// The global variable. +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")); +} -const Parameters* parameters = &static_parameters; +// 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(const Target* target) -{ static_parameters.set_target(target); } +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.