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[binutils.git] / gold / parameters.cc
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1 // parameters.cc -- general parameters for a link using gold
3 // Copyright 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
4 // Written by Ian Lance Taylor <iant@google.com>.
6 // This file is part of gold.
8 // This program is free software; you can redistribute it and/or modify
9 // it under the terms of the GNU General Public License as published by
10 // the Free Software Foundation; either version 3 of the License, or
11 // (at your option) any later version.
13 // This program is distributed in the hope that it will be useful,
14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 // GNU General Public License for more details.
18 // You should have received a copy of the GNU General Public License
19 // along with this program; if not, write to the Free Software
20 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 // MA 02110-1301, USA.
23 #include "gold.h"
25 #include "debug.h"
26 #include "options.h"
27 #include "target.h"
28 #include "target-select.h"
30 namespace gold
33 // Our local version of the variable, which is not const.
35 static Parameters static_parameters;
37 // The global variable.
39 const Parameters* parameters = &static_parameters;
41 // A helper class to set the target once.
43 class Set_parameters_target_once : public Once
45 public:
46 Set_parameters_target_once(Parameters* parameters)
47 : parameters_(parameters)
48 { }
50 protected:
51 void
52 do_run_once(void* arg)
53 { this->parameters_->set_target_once(static_cast<Target*>(arg)); }
55 private:
56 Parameters* parameters_;
59 // We only need one Set_parameters_target_once.
61 static
62 Set_parameters_target_once set_parameters_target_once(&static_parameters);
64 // Class Parameters.
66 Parameters::Parameters()
67 : errors_(NULL), options_(NULL), target_(NULL),
68 doing_static_link_valid_(false), doing_static_link_(false),
69 debug_(0), incremental_mode_(General_options::INCREMENTAL_OFF),
70 set_parameters_target_once_(&set_parameters_target_once)
74 void
75 Parameters::set_errors(Errors* errors)
77 gold_assert(this->errors_ == NULL);
78 this->errors_ = errors;
81 void
82 Parameters::set_options(const General_options* options)
84 gold_assert(!this->options_valid());
85 this->options_ = options;
86 // For speed, we convert the options() debug var from a string to an
87 // enum (from debug.h).
88 this->debug_ = debug_string_to_enum(this->options().debug());
89 // Set incremental_mode_ based on the value of the --incremental option.
90 // We copy the mode into parameters because it can change based on inputs.
91 this->incremental_mode_ = this->options().incremental_mode();
92 // If --verbose is set, it acts as "--debug=files".
93 if (options->verbose())
94 this->debug_ |= DEBUG_FILES;
95 if (this->target_valid())
96 this->check_target_endianness();
99 void
100 Parameters::set_doing_static_link(bool doing_static_link)
102 gold_assert(!this->doing_static_link_valid_);
103 this->doing_static_link_ = doing_static_link;
104 this->doing_static_link_valid_ = true;
107 void
108 Parameters::set_target(Target* target)
110 this->set_parameters_target_once_->run_once(static_cast<void*>(target));
111 gold_assert(target == this->target_);
114 // This is called at most once.
116 void
117 Parameters::set_target_once(Target* target)
119 gold_assert(this->target_ == NULL);
120 this->target_ = target;
121 if (this->options_valid())
122 this->check_target_endianness();
125 // Clear the target, for testing.
127 void
128 Parameters::clear_target()
130 this->target_ = NULL;
131 // We need a new Set_parameters_target_once so that we can set the
132 // target again.
133 this->set_parameters_target_once_ = new Set_parameters_target_once(this);
136 // Return whether TARGET is compatible with the target we are using.
138 bool
139 Parameters::is_compatible_target(const Target* target) const
141 if (this->target_ == NULL)
142 return true;
143 return target == this->target_;
146 Parameters::Target_size_endianness
147 Parameters::size_and_endianness() const
149 if (this->target().get_size() == 32)
151 if (!this->target().is_big_endian())
153 #ifdef HAVE_TARGET_32_LITTLE
154 return TARGET_32_LITTLE;
155 #else
156 gold_unreachable();
157 #endif
159 else
161 #ifdef HAVE_TARGET_32_BIG
162 return TARGET_32_BIG;
163 #else
164 gold_unreachable();
165 #endif
168 else if (parameters->target().get_size() == 64)
170 if (!parameters->target().is_big_endian())
172 #ifdef HAVE_TARGET_64_LITTLE
173 return TARGET_64_LITTLE;
174 #else
175 gold_unreachable();
176 #endif
178 else
180 #ifdef HAVE_TARGET_64_BIG
181 return TARGET_64_BIG;
182 #else
183 gold_unreachable();
184 #endif
187 else
188 gold_unreachable();
191 // If output endianness is specified in command line, check that it does
192 // not conflict with the target.
194 void
195 Parameters::check_target_endianness()
197 General_options::Endianness endianness = this->options().endianness();
198 if (endianness != General_options::ENDIANNESS_NOT_SET)
200 bool big_endian;
201 if (endianness == General_options::ENDIANNESS_BIG)
202 big_endian = true;
203 else
205 gold_assert(endianness == General_options::ENDIANNESS_LITTLE);
206 big_endian = false;;
209 if (this->target().is_big_endian() != big_endian)
210 gold_error(_("input file does not match -EB/EL option"));
214 // Set the incremental linking mode to INCREMENTAL_FULL. Used when
215 // the linker determines that an incremental update is not possible.
216 // Returns false if the incremental mode was INCREMENTAL_UPDATE,
217 // indicating that the linker should exit if an update is not possible.
219 bool
220 Parameters::set_incremental_full()
222 gold_assert(this->incremental_mode_ != General_options::INCREMENTAL_OFF);
223 if (this->incremental_mode_ == General_options::INCREMENTAL_UPDATE)
224 return false;
225 this->incremental_mode_ = General_options::INCREMENTAL_FULL;
226 return true;
229 // Return true if we need to prepare incremental linking information.
231 bool
232 Parameters::incremental() const
234 return this->incremental_mode_ != General_options::INCREMENTAL_OFF;
237 // Return true if we are doing an incremental update.
239 bool
240 Parameters::incremental_update() const
242 return (this->incremental_mode_ == General_options::INCREMENTAL_UPDATE
243 || this->incremental_mode_ == General_options::INCREMENTAL_AUTO);
246 void
247 set_parameters_errors(Errors* errors)
248 { static_parameters.set_errors(errors); }
250 void
251 set_parameters_options(const General_options* options)
252 { static_parameters.set_options(options); }
254 void
255 set_parameters_target(Target* target)
257 static_parameters.set_target(target);
258 target->select_as_default_target();
261 void
262 set_parameters_doing_static_link(bool doing_static_link)
263 { static_parameters.set_doing_static_link(doing_static_link); }
265 // Set the incremental linking mode to INCREMENTAL_FULL. Used when
266 // the linker determines that an incremental update is not possible.
267 // Returns false if the incremental mode was INCREMENTAL_UPDATE,
268 // indicating that the linker should exit if an update is not possible.
269 bool
270 set_parameters_incremental_full()
271 { return static_parameters.set_incremental_full(); }
273 // Force the target to be valid by using the default. Use the
274 // --oformat option is set; this supports the x86_64 kernel build,
275 // which converts a binary file to an object file using -r --format
276 // binary --oformat elf32-i386 foo.o. Otherwise use the configured
277 // default.
279 void
280 parameters_force_valid_target()
282 if (parameters->target_valid())
283 return;
285 gold_assert(parameters->options_valid());
286 if (parameters->options().user_set_oformat())
288 Target* target = select_target_by_name(parameters->options().oformat());
289 if (target != NULL)
291 set_parameters_target(target);
292 return;
295 gold_error(_("unrecognized output format %s"),
296 parameters->options().oformat());
299 // The GOLD_DEFAULT_xx macros are defined by the configure script.
300 bool is_big_endian;
301 General_options::Endianness endianness = parameters->options().endianness();
302 if (endianness == General_options::ENDIANNESS_BIG)
303 is_big_endian = true;
304 else if (endianness == General_options::ENDIANNESS_LITTLE)
305 is_big_endian = false;
306 else
307 is_big_endian = GOLD_DEFAULT_BIG_ENDIAN;
309 Target* target = select_target(elfcpp::GOLD_DEFAULT_MACHINE,
310 GOLD_DEFAULT_SIZE,
311 is_big_endian,
312 elfcpp::GOLD_DEFAULT_OSABI,
314 gold_assert(target != NULL);
315 set_parameters_target(target);
318 // Clear the current target, for testing.
320 void
321 parameters_clear_target()
323 static_parameters.clear_target();
326 } // End namespace gold.