// parameters.cc -- general parameters for a link using gold
-// Copyright 2006, 2007, 2008 Free Software Foundation, Inc.
+// Copyright (C) 2006-2020 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
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)
{
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)
{
// 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
}
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<void*>(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.
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.
projects / deliverable / binutils-gdb.git / blobdiff