| 1 | // parameters.cc -- general parameters for a link using gold |
| 2 | |
| 3 | // Copyright 2006, 2007, 2008, 2009, 2010, 2011, 2012 |
| 4 | // Free Software Foundation, Inc. |
| 5 | // Written by Ian Lance Taylor <iant@google.com>. |
| 6 | |
| 7 | // This file is part of gold. |
| 8 | |
| 9 | // This program is free software; you can redistribute it and/or modify |
| 10 | // it under the terms of the GNU General Public License as published by |
| 11 | // the Free Software Foundation; either version 3 of the License, or |
| 12 | // (at your option) any later version. |
| 13 | |
| 14 | // This program is distributed in the hope that it will be useful, |
| 15 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | // GNU General Public License for more details. |
| 18 | |
| 19 | // You should have received a copy of the GNU General Public License |
| 20 | // along with this program; if not, write to the Free Software |
| 21 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| 22 | // MA 02110-1301, USA. |
| 23 | |
| 24 | #include "gold.h" |
| 25 | |
| 26 | #include "debug.h" |
| 27 | #include "options.h" |
| 28 | #include "target.h" |
| 29 | #include "target-select.h" |
| 30 | |
| 31 | namespace gold |
| 32 | { |
| 33 | |
| 34 | // Our local version of the variable, which is not const. |
| 35 | |
| 36 | static Parameters static_parameters; |
| 37 | |
| 38 | // The global variable. |
| 39 | |
| 40 | const Parameters* parameters = &static_parameters; |
| 41 | |
| 42 | // A helper class to set the target once. |
| 43 | |
| 44 | class Set_parameters_target_once : public Once |
| 45 | { |
| 46 | public: |
| 47 | Set_parameters_target_once(Parameters* parameters) |
| 48 | : parameters_(parameters) |
| 49 | { } |
| 50 | |
| 51 | protected: |
| 52 | void |
| 53 | do_run_once(void* arg) |
| 54 | { this->parameters_->set_target_once(static_cast<Target*>(arg)); } |
| 55 | |
| 56 | private: |
| 57 | Parameters* parameters_; |
| 58 | }; |
| 59 | |
| 60 | // We only need one Set_parameters_target_once. |
| 61 | |
| 62 | static |
| 63 | Set_parameters_target_once set_parameters_target_once(&static_parameters); |
| 64 | |
| 65 | // Class Parameters. |
| 66 | |
| 67 | Parameters::Parameters() |
| 68 | : errors_(NULL), timer_(NULL), options_(NULL), target_(NULL), |
| 69 | doing_static_link_valid_(false), doing_static_link_(false), |
| 70 | debug_(0), incremental_mode_(General_options::INCREMENTAL_OFF), |
| 71 | set_parameters_target_once_(&set_parameters_target_once) |
| 72 | { |
| 73 | } |
| 74 | |
| 75 | void |
| 76 | Parameters::set_errors(Errors* errors) |
| 77 | { |
| 78 | gold_assert(this->errors_ == NULL); |
| 79 | this->errors_ = errors; |
| 80 | } |
| 81 | |
| 82 | void |
| 83 | Parameters::set_timer(Timer* timer) |
| 84 | { |
| 85 | gold_assert(this->timer_ == NULL); |
| 86 | this->timer_ = timer; |
| 87 | } |
| 88 | |
| 89 | void |
| 90 | Parameters::set_options(const General_options* options) |
| 91 | { |
| 92 | gold_assert(!this->options_valid()); |
| 93 | this->options_ = options; |
| 94 | // For speed, we convert the options() debug var from a string to an |
| 95 | // enum (from debug.h). |
| 96 | this->debug_ = debug_string_to_enum(this->options().debug()); |
| 97 | // Set incremental_mode_ based on the value of the --incremental option. |
| 98 | // We copy the mode into parameters because it can change based on inputs. |
| 99 | this->incremental_mode_ = this->options().incremental_mode(); |
| 100 | // If --verbose is set, it acts as "--debug=files". |
| 101 | if (options->verbose()) |
| 102 | this->debug_ |= DEBUG_FILES; |
| 103 | if (this->target_valid()) |
| 104 | this->check_target_endianness(); |
| 105 | } |
| 106 | |
| 107 | void |
| 108 | Parameters::set_doing_static_link(bool doing_static_link) |
| 109 | { |
| 110 | gold_assert(!this->doing_static_link_valid_); |
| 111 | this->doing_static_link_ = doing_static_link; |
| 112 | this->doing_static_link_valid_ = true; |
| 113 | } |
| 114 | |
| 115 | void |
| 116 | Parameters::set_target(Target* target) |
| 117 | { |
| 118 | this->set_parameters_target_once_->run_once(static_cast<void*>(target)); |
| 119 | gold_assert(target == this->target_); |
| 120 | } |
| 121 | |
| 122 | // This is called at most once. |
| 123 | |
| 124 | void |
| 125 | Parameters::set_target_once(Target* target) |
| 126 | { |
| 127 | gold_assert(this->target_ == NULL); |
| 128 | this->target_ = target; |
| 129 | if (this->options_valid()) |
| 130 | this->check_target_endianness(); |
| 131 | } |
| 132 | |
| 133 | // Clear the target, for testing. |
| 134 | |
| 135 | void |
| 136 | Parameters::clear_target() |
| 137 | { |
| 138 | this->target_ = NULL; |
| 139 | // We need a new Set_parameters_target_once so that we can set the |
| 140 | // target again. |
| 141 | this->set_parameters_target_once_ = new Set_parameters_target_once(this); |
| 142 | } |
| 143 | |
| 144 | // Return whether TARGET is compatible with the target we are using. |
| 145 | |
| 146 | bool |
| 147 | Parameters::is_compatible_target(const Target* target) const |
| 148 | { |
| 149 | if (this->target_ == NULL) |
| 150 | return true; |
| 151 | return target == this->target_; |
| 152 | } |
| 153 | |
| 154 | Parameters::Target_size_endianness |
| 155 | Parameters::size_and_endianness() const |
| 156 | { |
| 157 | if (this->target().get_size() == 32) |
| 158 | { |
| 159 | if (!this->target().is_big_endian()) |
| 160 | { |
| 161 | #ifdef HAVE_TARGET_32_LITTLE |
| 162 | return TARGET_32_LITTLE; |
| 163 | #else |
| 164 | gold_unreachable(); |
| 165 | #endif |
| 166 | } |
| 167 | else |
| 168 | { |
| 169 | #ifdef HAVE_TARGET_32_BIG |
| 170 | return TARGET_32_BIG; |
| 171 | #else |
| 172 | gold_unreachable(); |
| 173 | #endif |
| 174 | } |
| 175 | } |
| 176 | else if (parameters->target().get_size() == 64) |
| 177 | { |
| 178 | if (!parameters->target().is_big_endian()) |
| 179 | { |
| 180 | #ifdef HAVE_TARGET_64_LITTLE |
| 181 | return TARGET_64_LITTLE; |
| 182 | #else |
| 183 | gold_unreachable(); |
| 184 | #endif |
| 185 | } |
| 186 | else |
| 187 | { |
| 188 | #ifdef HAVE_TARGET_64_BIG |
| 189 | return TARGET_64_BIG; |
| 190 | #else |
| 191 | gold_unreachable(); |
| 192 | #endif |
| 193 | } |
| 194 | } |
| 195 | else |
| 196 | gold_unreachable(); |
| 197 | } |
| 198 | |
| 199 | // If output endianness is specified in command line, check that it does |
| 200 | // not conflict with the target. |
| 201 | |
| 202 | void |
| 203 | Parameters::check_target_endianness() |
| 204 | { |
| 205 | General_options::Endianness endianness = this->options().endianness(); |
| 206 | if (endianness != General_options::ENDIANNESS_NOT_SET) |
| 207 | { |
| 208 | bool big_endian; |
| 209 | if (endianness == General_options::ENDIANNESS_BIG) |
| 210 | big_endian = true; |
| 211 | else |
| 212 | { |
| 213 | gold_assert(endianness == General_options::ENDIANNESS_LITTLE); |
| 214 | big_endian = false;; |
| 215 | } |
| 216 | |
| 217 | if (this->target().is_big_endian() != big_endian) |
| 218 | gold_error(_("input file does not match -EB/EL option")); |
| 219 | } |
| 220 | } |
| 221 | |
| 222 | // Return the name of the entry symbol. |
| 223 | |
| 224 | const char* |
| 225 | Parameters::entry() const |
| 226 | { |
| 227 | const char* ret = this->options().entry(); |
| 228 | if (ret == NULL) |
| 229 | { |
| 230 | // FIXME: Need to support target specific entry symbol. |
| 231 | ret = "_start"; |
| 232 | } |
| 233 | return ret; |
| 234 | } |
| 235 | |
| 236 | // Set the incremental linking mode to INCREMENTAL_FULL. Used when |
| 237 | // the linker determines that an incremental update is not possible. |
| 238 | // Returns false if the incremental mode was INCREMENTAL_UPDATE, |
| 239 | // indicating that the linker should exit if an update is not possible. |
| 240 | |
| 241 | bool |
| 242 | Parameters::set_incremental_full() |
| 243 | { |
| 244 | gold_assert(this->incremental_mode_ != General_options::INCREMENTAL_OFF); |
| 245 | if (this->incremental_mode_ == General_options::INCREMENTAL_UPDATE) |
| 246 | return false; |
| 247 | this->incremental_mode_ = General_options::INCREMENTAL_FULL; |
| 248 | return true; |
| 249 | } |
| 250 | |
| 251 | // Return true if we need to prepare incremental linking information. |
| 252 | |
| 253 | bool |
| 254 | Parameters::incremental() const |
| 255 | { |
| 256 | return this->incremental_mode_ != General_options::INCREMENTAL_OFF; |
| 257 | } |
| 258 | |
| 259 | // Return true if we are doing a full incremental link. |
| 260 | |
| 261 | bool |
| 262 | Parameters::incremental_full() const |
| 263 | { |
| 264 | return this->incremental_mode_ == General_options::INCREMENTAL_FULL; |
| 265 | } |
| 266 | |
| 267 | // Return true if we are doing an incremental update. |
| 268 | |
| 269 | bool |
| 270 | Parameters::incremental_update() const |
| 271 | { |
| 272 | return (this->incremental_mode_ == General_options::INCREMENTAL_UPDATE |
| 273 | || this->incremental_mode_ == General_options::INCREMENTAL_AUTO); |
| 274 | } |
| 275 | |
| 276 | void |
| 277 | set_parameters_errors(Errors* errors) |
| 278 | { static_parameters.set_errors(errors); } |
| 279 | |
| 280 | void |
| 281 | set_parameters_timer(Timer* timer) |
| 282 | { static_parameters.set_timer(timer); } |
| 283 | |
| 284 | void |
| 285 | set_parameters_options(const General_options* options) |
| 286 | { static_parameters.set_options(options); } |
| 287 | |
| 288 | void |
| 289 | set_parameters_target(Target* target) |
| 290 | { |
| 291 | static_parameters.set_target(target); |
| 292 | target->select_as_default_target(); |
| 293 | } |
| 294 | |
| 295 | void |
| 296 | set_parameters_doing_static_link(bool doing_static_link) |
| 297 | { static_parameters.set_doing_static_link(doing_static_link); } |
| 298 | |
| 299 | // Set the incremental linking mode to INCREMENTAL_FULL. Used when |
| 300 | // the linker determines that an incremental update is not possible. |
| 301 | // Returns false if the incremental mode was INCREMENTAL_UPDATE, |
| 302 | // indicating that the linker should exit if an update is not possible. |
| 303 | bool |
| 304 | set_parameters_incremental_full() |
| 305 | { return static_parameters.set_incremental_full(); } |
| 306 | |
| 307 | // Force the target to be valid by using the default. Use the |
| 308 | // --oformat option is set; this supports the x86_64 kernel build, |
| 309 | // which converts a binary file to an object file using -r --format |
| 310 | // binary --oformat elf32-i386 foo.o. Otherwise use the configured |
| 311 | // default. |
| 312 | |
| 313 | void |
| 314 | parameters_force_valid_target() |
| 315 | { |
| 316 | if (parameters->target_valid()) |
| 317 | return; |
| 318 | |
| 319 | gold_assert(parameters->options_valid()); |
| 320 | if (parameters->options().user_set_oformat()) |
| 321 | { |
| 322 | const char* bfd_name = parameters->options().oformat(); |
| 323 | Target* target = select_target_by_bfd_name(bfd_name); |
| 324 | if (target != NULL) |
| 325 | { |
| 326 | set_parameters_target(target); |
| 327 | return; |
| 328 | } |
| 329 | |
| 330 | gold_error(_("unrecognized output format %s"), bfd_name); |
| 331 | } |
| 332 | |
| 333 | if (parameters->options().user_set_m()) |
| 334 | { |
| 335 | const char* emulation = parameters->options().m(); |
| 336 | Target* target = select_target_by_emulation(emulation); |
| 337 | if (target != NULL) |
| 338 | { |
| 339 | set_parameters_target(target); |
| 340 | return; |
| 341 | } |
| 342 | |
| 343 | gold_error(_("unrecognized emulation %s"), emulation); |
| 344 | } |
| 345 | |
| 346 | // The GOLD_DEFAULT_xx macros are defined by the configure script. |
| 347 | bool is_big_endian; |
| 348 | General_options::Endianness endianness = parameters->options().endianness(); |
| 349 | if (endianness == General_options::ENDIANNESS_BIG) |
| 350 | is_big_endian = true; |
| 351 | else if (endianness == General_options::ENDIANNESS_LITTLE) |
| 352 | is_big_endian = false; |
| 353 | else |
| 354 | is_big_endian = GOLD_DEFAULT_BIG_ENDIAN; |
| 355 | |
| 356 | Target* target = select_target(NULL, 0, |
| 357 | elfcpp::GOLD_DEFAULT_MACHINE, |
| 358 | GOLD_DEFAULT_SIZE, |
| 359 | is_big_endian, |
| 360 | elfcpp::GOLD_DEFAULT_OSABI, |
| 361 | 0); |
| 362 | |
| 363 | if (target == NULL) |
| 364 | { |
| 365 | gold_assert(is_big_endian != GOLD_DEFAULT_BIG_ENDIAN); |
| 366 | gold_fatal(_("no supported target for -EB/-EL option")); |
| 367 | } |
| 368 | |
| 369 | set_parameters_target(target); |
| 370 | } |
| 371 | |
| 372 | // Clear the current target, for testing. |
| 373 | |
| 374 | void |
| 375 | parameters_clear_target() |
| 376 | { |
| 377 | static_parameters.clear_target(); |
| 378 | } |
| 379 | |
| 380 | } // End namespace gold. |