gold/errors.cc

   1 // errors.cc -- handle errors for gold
   2
   3 // Copyright (C) 2006-2017 Free Software Foundation, Inc.
   4 // Written by Ian Lance Taylor <iant@google.com>.
   5
   6 // This file is part of gold.
   7
   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.
  12
  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.
  17
  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.
  22
  23 #include "gold.h"
  24
  25 #include <cstdarg>
  26 #include <cstdio>
  27
  28 #include "gold-threads.h"
  29 #include "parameters.h"
  30 #include "object.h"
  31 #include "symtab.h"
  32 #include "errors.h"
  33
  34 namespace gold
  35 {
  36
  37 // Class Errors.
  38
  39 const int Errors::max_undefined_error_report;
  40
  41 Errors::Errors(const char* program_name)
  42   : program_name_(program_name), lock_(NULL), initialize_lock_(&this->lock_),
  43     error_count_(0), warning_count_(0), undefined_symbols_()
  44 {
  45 }
  46
  47 // Initialize the lock_ field.  If we have not yet processed the
  48 // parameters, then we can't initialize, since we don't yet know
  49 // whether we are using threads.  That is OK, since if we haven't
  50 // processed the parameters, we haven't created any threads, and we
  51 // don't need a lock.  Return true if the lock is now initialized.
  52
  53 bool
  54 Errors::initialize_lock()
  55 {
  56   return this->initialize_lock_.initialize();
  57 }
  58
  59 // Increment a counter, holding the lock if available.
  60
  61 void
  62 Errors::increment_counter(int *counter)
  63 {
  64   if (!this->initialize_lock())
  65     {
  66       // The lock does not exist, which means that we don't need it.
  67       ++*counter;
  68     }
  69   else
  70     {
  71       Hold_lock h(*this->lock_);
  72       ++*counter;
  73     }
  74 }
  75
  76 // Report a fatal error.
  77
  78 void
  79 Errors::fatal(const char* format, va_list args)
  80 {
  81   fprintf(stderr, _("%s: fatal error: "), this->program_name_);
  82   vfprintf(stderr, format, args);
  83   fputc('\n', stderr);
  84   gold_exit(GOLD_ERR);
  85 }
  86
  87 // Report a fallback error.
  88
  89 void
  90 Errors::fallback(const char* format, va_list args)
  91 {
  92   fprintf(stderr, _("%s: fatal error: "), this->program_name_);
  93   vfprintf(stderr, format, args);
  94   fputc('\n', stderr);
  95   gold_exit(GOLD_FALLBACK);
  96 }
  97
  98 // Report an error.
  99
 100 void
 101 Errors::error(const char* format, va_list args)
 102 {
 103   fprintf(stderr, _("%s: error: "), this->program_name_);
 104   vfprintf(stderr, format, args);
 105   fputc('\n', stderr);
 106
 107   this->increment_counter(&this->error_count_);
 108 }
 109
 110 // Report a warning.
 111
 112 void
 113 Errors::warning(const char* format, va_list args)
 114 {
 115   fprintf(stderr, _("%s: warning: "), this->program_name_);
 116   vfprintf(stderr, format, args);
 117   fputc('\n', stderr);
 118
 119   this->increment_counter(&this->warning_count_);
 120 }
 121
 122 // Print an informational message.
 123
 124 void
 125 Errors::info(const char* format, va_list args)
 126 {
 127   vfprintf(stderr, format, args);
 128   fputc('\n', stderr);
 129 }
 130
 131 // Report an error at a reloc location.
 132
 133 template<int size, bool big_endian>
 134 void
 135 Errors::error_at_location(const Relocate_info<size, big_endian>* relinfo,
 136                           size_t relnum, off_t reloffset,
 137                           const char* format, va_list args)
 138 {
 139   fprintf(stderr, _("%s: error: "),
 140           relinfo->location(relnum, reloffset).c_str());
 141   vfprintf(stderr, format, args);
 142   fputc('\n', stderr);
 143
 144   this->increment_counter(&this->error_count_);
 145 }
 146
 147 // Report a warning at a reloc location.
 148
 149 template<int size, bool big_endian>
 150 void
 151 Errors::warning_at_location(const Relocate_info<size, big_endian>* relinfo,
 152                             size_t relnum, off_t reloffset,
 153                             const char* format, va_list args)
 154 {
 155   fprintf(stderr, _("%s: warning: "),
 156           relinfo->location(relnum, reloffset).c_str());
 157   vfprintf(stderr, format, args);
 158   fputc('\n', stderr);
 159
 160   this->increment_counter(&this->warning_count_);
 161 }
 162
 163 // Issue an undefined symbol error with a caller-supplied location string.
 164
 165 void
 166 Errors::undefined_symbol(const Symbol* sym, const std::string& location)
 167 {
 168   bool initialized = this->initialize_lock();
 169   gold_assert(initialized);
 170
 171   const char* zmsg;
 172   {
 173     Hold_lock h(*this->lock_);
 174     if (++this->undefined_symbols_[sym] >= max_undefined_error_report)
 175       return;
 176     if (parameters->options().warn_unresolved_symbols())
 177       {
 178         ++this->warning_count_;
 179         zmsg = _("warning");
 180       }
 181     else
 182       {
 183         ++this->error_count_;
 184         zmsg = _("error");
 185       }
 186   }
 187
 188   const char* const version = sym->version();
 189   if (version == NULL)
 190     fprintf(stderr, _("%s: %s: undefined reference to '%s'\n"),
 191             location.c_str(), zmsg, sym->demangled_name().c_str());
 192   else
 193     fprintf(stderr,
 194             _("%s: %s: undefined reference to '%s', version '%s'\n"),
 195             location.c_str(), zmsg, sym->demangled_name().c_str(), version);
 196
 197   if (sym->is_cxx_vtable())
 198     gold_info(_("%s: the vtable symbol may be undefined because "
 199                 "the class is missing its key function"),
 200               program_name);
 201   if (sym->is_placeholder())
 202     gold_info(_("%s: the symbol should have been defined by a plugin"),
 203               program_name);
 204 }
 205
 206 // Issue a debugging message.
 207
 208 void
 209 Errors::debug(const char* format, ...)
 210 {
 211   fprintf(stderr, _("%s: "), this->program_name_);
 212
 213   va_list args;
 214   va_start(args, format);
 215   vfprintf(stderr, format, args);
 216   va_end(args);
 217
 218   fputc('\n', stderr);
 219 }
 220
 221 // The functions which the rest of the code actually calls.
 222
 223 // Report a fatal error.
 224
 225 void
 226 gold_fatal(const char* format, ...)
 227 {
 228   va_list args;
 229   va_start(args, format);
 230   parameters->errors()->fatal(format, args);
 231   va_end(args);
 232 }
 233
 234 // Report a fallback error.
 235
 236 void
 237 gold_fallback(const char* format, ...)
 238 {
 239   va_list args;
 240   va_start(args, format);
 241   parameters->errors()->fallback(format, args);
 242   va_end(args);
 243 }
 244
 245 // Report an error.
 246
 247 void
 248 gold_error(const char* format, ...)
 249 {
 250   va_list args;
 251   va_start(args, format);
 252   parameters->errors()->error(format, args);
 253   va_end(args);
 254 }
 255
 256 // Report a warning.
 257
 258 void
 259 gold_warning(const char* format, ...)
 260 {
 261   va_list args;
 262   va_start(args, format);
 263   parameters->errors()->warning(format, args);
 264   va_end(args);
 265 }
 266
 267 // Print an informational message.
 268
 269 void
 270 gold_info(const char* format, ...)
 271 {
 272   va_list args;
 273   va_start(args, format);
 274   parameters->errors()->info(format, args);
 275   va_end(args);
 276 }
 277
 278 // Report an error at a location.
 279
 280 template<int size, bool big_endian>
 281 void
 282 gold_error_at_location(const Relocate_info<size, big_endian>* relinfo,
 283                        size_t relnum, off_t reloffset,
 284                        const char* format, ...)
 285 {
 286   va_list args;
 287   va_start(args, format);
 288   parameters->errors()->error_at_location(relinfo, relnum, reloffset,
 289                                           format, args);
 290   va_end(args);
 291 }
 292
 293 // Report a warning at a location.
 294
 295 template<int size, bool big_endian>
 296 void
 297 gold_warning_at_location(const Relocate_info<size, big_endian>* relinfo,
 298                          size_t relnum, off_t reloffset,
 299                          const char* format, ...)
 300 {
 301   va_list args;
 302   va_start(args, format);
 303   parameters->errors()->warning_at_location(relinfo, relnum, reloffset,
 304                                             format, args);
 305   va_end(args);
 306 }
 307
 308 // Report an undefined symbol.
 309
 310 void
 311 gold_undefined_symbol(const Symbol* sym)
 312 {
 313   parameters->errors()->undefined_symbol(sym, sym->object()->name().c_str());
 314 }
 315
 316 // Report an undefined symbol at a reloc location
 317
 318 template<int size, bool big_endian>
 319 void
 320 gold_undefined_symbol_at_location(const Symbol* sym,
 321                       const Relocate_info<size, big_endian>* relinfo,
 322                       size_t relnum, off_t reloffset)
 323 {
 324   parameters->errors()->undefined_symbol(sym,
 325                                          relinfo->location(relnum, reloffset));
 326 }
 327
 328 #ifdef HAVE_TARGET_32_LITTLE
 329 template
 330 void
 331 gold_error_at_location<32, false>(const Relocate_info<32, false>* relinfo,
 332                                   size_t relnum, off_t reloffset,
 333                                   const char* format, ...);
 334 #endif
 335
 336 #ifdef HAVE_TARGET_32_BIG
 337 template
 338 void
 339 gold_error_at_location<32, true>(const Relocate_info<32, true>* relinfo,
 340                                  size_t relnum, off_t reloffset,
 341                                  const char* format, ...);
 342 #endif
 343
 344 #ifdef HAVE_TARGET_64_LITTLE
 345 template
 346 void
 347 gold_error_at_location<64, false>(const Relocate_info<64, false>* relinfo,
 348                                   size_t relnum, off_t reloffset,
 349                                   const char* format, ...);
 350 #endif
 351
 352 #ifdef HAVE_TARGET_64_BIG
 353 template
 354 void
 355 gold_error_at_location<64, true>(const Relocate_info<64, true>* relinfo,
 356                                  size_t relnum, off_t reloffset,
 357                                  const char* format, ...);
 358 #endif
 359
 360 #ifdef HAVE_TARGET_32_LITTLE
 361 template
 362 void
 363 gold_warning_at_location<32, false>(const Relocate_info<32, false>* relinfo,
 364                                     size_t relnum, off_t reloffset,
 365                                     const char* format, ...);
 366 #endif
 367
 368 #ifdef HAVE_TARGET_32_BIG
 369 template
 370 void
 371 gold_warning_at_location<32, true>(const Relocate_info<32, true>* relinfo,
 372                                    size_t relnum, off_t reloffset,
 373                                    const char* format, ...);
 374 #endif
 375
 376 #ifdef HAVE_TARGET_64_LITTLE
 377 template
 378 void
 379 gold_warning_at_location<64, false>(const Relocate_info<64, false>* relinfo,
 380                                     size_t relnum, off_t reloffset,
 381                                     const char* format, ...);
 382 #endif
 383
 384 #ifdef HAVE_TARGET_64_BIG
 385 template
 386 void
 387 gold_warning_at_location<64, true>(const Relocate_info<64, true>* relinfo,
 388                                    size_t relnum, off_t reloffset,
 389                                    const char* format, ...);
 390 #endif
 391
 392 #ifdef HAVE_TARGET_32_LITTLE
 393 template
 394 void
 395 gold_undefined_symbol_at_location<32, false>(
 396     const Symbol* sym,
 397     const Relocate_info<32, false>* relinfo,
 398     size_t relnum, off_t reloffset);
 399 #endif
 400
 401 #ifdef HAVE_TARGET_32_BIG
 402 template
 403 void
 404 gold_undefined_symbol_at_location<32, true>(
 405     const Symbol* sym,
 406     const Relocate_info<32, true>* relinfo,
 407     size_t relnum, off_t reloffset);
 408 #endif
 409
 410 #ifdef HAVE_TARGET_64_LITTLE
 411 template
 412 void
 413 gold_undefined_symbol_at_location<64, false>(
 414     const Symbol* sym,
 415     const Relocate_info<64, false>* relinfo,
 416     size_t relnum, off_t reloffset);
 417 #endif
 418
 419 #ifdef HAVE_TARGET_64_BIG
 420 template
 421 void
 422 gold_undefined_symbol_at_location<64, true>(
 423     const Symbol* sym,
 424     const Relocate_info<64, true>* relinfo,
 425     size_t relnum, off_t reloffset);
 426 #endif
 427
 428 } // End namespace gold.