libstdc++-v3/libsupc++/vec.cc

   1 // New abi Support -*- C++ -*-
   2
   3 // Copyright (C) 2000-2018 Free Software Foundation, Inc.
   4 //
   5 // This file is part of GCC.
   6 //
   7 // GCC is free software; you can redistribute it and/or modify
   8 // it under the terms of the GNU General Public License as published by
   9 // the Free Software Foundation; either version 3, or (at your option)
  10 // any later version.
  11
  12 // GCC is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16
  17 // Under Section 7 of GPL version 3, you are granted additional
  18 // permissions described in the GCC Runtime Library Exception, version
  19 // 3.1, as published by the Free Software Foundation.
  20
  21 // You should have received a copy of the GNU General Public License and
  22 // a copy of the GCC Runtime Library Exception along with this program;
  23 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  24 // <http://www.gnu.org/licenses/>.
  25
  26 // Written by Nathan Sidwell, Codesourcery LLC, <nathan@codesourcery.com>
  27
  28 #include <cxxabi.h>
  29 #include <new>
  30 #include <exception>
  31 #include <bits/exception_defines.h>
  32 #include "unwind-cxx.h"
  33
  34 namespace __cxxabiv1
  35 {
  36   namespace
  37   {
  38     struct uncatch_exception
  39     {
  40       uncatch_exception();
  41       ~uncatch_exception () { __cxa_begin_catch (&p->unwindHeader); }
  42
  43       __cxa_exception* p;
  44
  45     private:
  46       uncatch_exception&
  47       operator=(const uncatch_exception&);
  48
  49       uncatch_exception(const uncatch_exception&);
  50     };
  51
  52     uncatch_exception::uncatch_exception() : p(0)
  53     {
  54       __cxa_eh_globals *globals = __cxa_get_globals_fast ();
  55
  56       p = globals->caughtExceptions;
  57       p->handlerCount -= 1;
  58       globals->caughtExceptions = p->nextException;
  59       globals->uncaughtExceptions += 1;
  60     }
  61
  62     // Compute the total size with overflow checking.
  63     std::size_t compute_size(std::size_t element_count,
  64                              std::size_t element_size,
  65                              std::size_t padding_size)
  66     {
  67       if (element_size && element_count > std::size_t(-1) / element_size)
  68         _GLIBCXX_THROW_OR_ABORT(std::bad_alloc());
  69       std::size_t size = element_count * element_size;
  70       if (size + padding_size < size)
  71         _GLIBCXX_THROW_OR_ABORT(std::bad_alloc());
  72       return size + padding_size;
  73     }
  74   }
  75
  76   // Allocate and construct array.
  77   extern "C" void *
  78   __cxa_vec_new(std::size_t element_count,
  79                 std::size_t element_size,
  80                 std::size_t padding_size,
  81                 __cxa_cdtor_type constructor,
  82                 __cxa_cdtor_type destructor)
  83   {
  84     return __cxa_vec_new2(element_count, element_size, padding_size,
  85                            constructor, destructor,
  86                            &operator new[], &operator delete []);
  87   }
  88
  89   extern "C" void *
  90   __cxa_vec_new2(std::size_t element_count,
  91                  std::size_t element_size,
  92                  std::size_t padding_size,
  93                  __cxa_cdtor_type constructor,
  94                  __cxa_cdtor_type destructor,
  95                  void *(*alloc) (std::size_t),
  96                  void (*dealloc) (void *))
  97   {
  98     std::size_t size
  99       = compute_size(element_count, element_size, padding_size);
 100     char *base = static_cast <char *> (alloc (size));
 101     if (!base)
 102       return base;
 103
 104     if (padding_size)
 105       {
 106         base += padding_size;
 107         reinterpret_cast <std::size_t *> (base)[-1] = element_count;
 108 #ifdef _GLIBCXX_ELTSIZE_IN_COOKIE
 109         reinterpret_cast <std::size_t *> (base)[-2] = element_size;
 110 #endif
 111       }
 112     __try
 113       {
 114         __cxa_vec_ctor(base, element_count, element_size,
 115                        constructor, destructor);
 116       }
 117     __catch(...)
 118       {
 119         {
 120           uncatch_exception ue;
 121           // Core issue 901 will probably be resolved such that a
 122           // deleted operator delete means not freeing memory here.
 123           if (dealloc)
 124             dealloc(base - padding_size);
 125         }
 126         __throw_exception_again;
 127       }
 128     return base;
 129   }
 130
 131   extern "C" void *
 132   __cxa_vec_new3(std::size_t element_count,
 133                  std::size_t element_size,
 134                  std::size_t padding_size,
 135                  __cxa_cdtor_type constructor,
 136                  __cxa_cdtor_type destructor,
 137                  void *(*alloc) (std::size_t),
 138                  void (*dealloc) (void *, std::size_t))
 139   {
 140     std::size_t size
 141       = compute_size(element_count, element_size, padding_size);
 142     char *base = static_cast<char *>(alloc (size));
 143     if (!base)
 144       return base;
 145
 146     if (padding_size)
 147       {
 148         base += padding_size;
 149         reinterpret_cast<std::size_t *>(base)[-1] = element_count;
 150 #ifdef _GLIBCXX_ELTSIZE_IN_COOKIE
 151         reinterpret_cast <std::size_t *> (base)[-2] = element_size;
 152 #endif
 153       }
 154     __try
 155       {
 156         __cxa_vec_ctor(base, element_count, element_size,
 157                        constructor, destructor);
 158       }
 159     __catch(...)
 160       {
 161         {
 162           uncatch_exception ue;
 163           if (dealloc)
 164             dealloc(base - padding_size, size);
 165         }
 166         __throw_exception_again;
 167       }
 168     return base;
 169   }
 170
 171   // Construct array.
 172   extern "C" __cxa_vec_ctor_return_type
 173   __cxa_vec_ctor(void *array_address,
 174                  std::size_t element_count,
 175                  std::size_t element_size,
 176                  __cxa_cdtor_type constructor,
 177                  __cxa_cdtor_type destructor)
 178   {
 179     std::size_t ix = 0;
 180     char *ptr = static_cast<char *>(array_address);
 181
 182     __try
 183       {
 184         if (constructor)
 185           for (; ix != element_count; ix++, ptr += element_size)
 186             constructor(ptr);
 187       }
 188     __catch(...)
 189       {
 190         {
 191           uncatch_exception ue;
 192           __cxa_vec_cleanup(array_address, ix, element_size, destructor);
 193         }
 194         __throw_exception_again;
 195       }
 196     _GLIBCXX_CXA_VEC_CTOR_RETURN (array_address);
 197   }
 198
 199   // Construct an array by copying.
 200   extern "C" __cxa_vec_ctor_return_type
 201   __cxa_vec_cctor(void *dest_array,
 202                   void *src_array,
 203                   std::size_t element_count,
 204                   std::size_t element_size,
 205                   __cxa_cdtor_return_type (*constructor) (void *, void *),
 206                   __cxa_cdtor_type destructor)
 207   {
 208     std::size_t ix = 0;
 209     char *dest_ptr = static_cast<char *>(dest_array);
 210     char *src_ptr = static_cast<char *>(src_array);
 211
 212     __try
 213       {
 214         if (constructor)
 215           for (; ix != element_count;
 216                ix++, src_ptr += element_size, dest_ptr += element_size)
 217             constructor(dest_ptr, src_ptr);
 218       }
 219     __catch(...)
 220       {
 221         {
 222           uncatch_exception ue;
 223           __cxa_vec_cleanup(dest_array, ix, element_size, destructor);
 224         }
 225         __throw_exception_again;
 226       }
 227     _GLIBCXX_CXA_VEC_CTOR_RETURN (dest_array);
 228   }
 229
 230   // Destruct array.
 231   extern "C" void
 232   __cxa_vec_dtor(void *array_address,
 233                  std::size_t element_count,
 234                  std::size_t element_size,
 235                  __cxa_cdtor_type destructor)
 236   {
 237     if (destructor)
 238       {
 239         char *ptr = static_cast<char *>(array_address);
 240         std::size_t ix = element_count;
 241
 242         ptr += element_count * element_size;
 243
 244         __try
 245           {
 246             while (ix--)
 247               {
 248                 ptr -= element_size;
 249                 destructor(ptr);
 250               }
 251           }
 252         __catch(...)
 253           {
 254             {
 255               uncatch_exception ue;
 256               __cxa_vec_cleanup(array_address, ix, element_size, destructor);
 257             }
 258             __throw_exception_again;
 259           }
 260       }
 261   }
 262
 263   // Destruct array as a result of throwing an exception.
 264   // [except.ctor]/3 If a destructor called during stack unwinding
 265   // exits with an exception, terminate is called.
 266   extern "C" void
 267   __cxa_vec_cleanup(void *array_address,
 268                     std::size_t element_count,
 269                     std::size_t element_size,
 270                     __cxa_cdtor_type destructor) throw()
 271   {
 272     if (destructor)
 273       {
 274         char *ptr = static_cast <char *> (array_address);
 275         std::size_t ix = element_count;
 276
 277         ptr += element_count * element_size;
 278
 279         __try
 280           {
 281             while (ix--)
 282               {
 283                 ptr -= element_size;
 284                 destructor(ptr);
 285               }
 286           }
 287         __catch(...)
 288           {
 289             std::terminate();
 290           }
 291       }
 292   }
 293
 294   // Destruct and release array.
 295   extern "C" void
 296   __cxa_vec_delete(void *array_address,
 297                    std::size_t element_size,
 298                    std::size_t padding_size,
 299                    __cxa_cdtor_type destructor)
 300   {
 301     __cxa_vec_delete2(array_address, element_size, padding_size,
 302                        destructor,
 303                        &operator delete []);
 304   }
 305
 306   extern "C" void
 307   __cxa_vec_delete2(void *array_address,
 308                     std::size_t element_size,
 309                     std::size_t padding_size,
 310                     __cxa_cdtor_type destructor,
 311                     void (*dealloc) (void *))
 312   {
 313     if (!array_address)
 314       return;
 315
 316     char* base = static_cast<char *>(array_address);
 317
 318     if (padding_size)
 319       {
 320         std::size_t element_count = reinterpret_cast<std::size_t *>(base)[-1];
 321         base -= padding_size;
 322         __try
 323           {
 324             __cxa_vec_dtor(array_address, element_count, element_size,
 325                            destructor);
 326           }
 327         __catch(...)
 328           {
 329             {
 330               uncatch_exception ue;
 331               dealloc(base);
 332             }
 333             __throw_exception_again;
 334           }
 335       }
 336     dealloc(base);
 337   }
 338
 339   extern "C" void
 340   __cxa_vec_delete3(void *array_address,
 341                     std::size_t element_size,
 342                     std::size_t padding_size,
 343                      __cxa_cdtor_type destructor,
 344                     void (*dealloc) (void *, std::size_t))
 345   {
 346     if (!array_address)
 347       return;
 348
 349     char* base = static_cast <char *> (array_address);
 350     std::size_t size = 0;
 351
 352     if (padding_size)
 353       {
 354         std::size_t element_count = reinterpret_cast<std::size_t *> (base)[-1];
 355         base -= padding_size;
 356         size = element_count * element_size + padding_size;
 357         __try
 358           {
 359             __cxa_vec_dtor(array_address, element_count, element_size,
 360                            destructor);
 361           }
 362         __catch(...)
 363           {
 364             {
 365               uncatch_exception ue;
 366               dealloc(base, size);
 367             }
 368             __throw_exception_again;
 369           }
 370       }
 371     dealloc(base, size);
 372   }
 373 } // namespace __cxxabiv1
 374
 375 #if defined(__arm__) && defined(__ARM_EABI__)
 376
 377 // The ARM C++ ABI requires that the library provide these additional
 378 // helper functions.  There are placed in this file, despite being
 379 // architecture-specifier, so that the compiler can inline the __cxa
 380 // functions into these functions as appropriate.
 381
 382 namespace __aeabiv1
 383 {
 384   extern "C" void *
 385   __aeabi_vec_ctor_nocookie_nodtor (void *array_address,
 386                                     abi::__cxa_cdtor_type constructor,
 387                                     std::size_t element_size,
 388                                     std::size_t element_count)
 389   {
 390     return abi::__cxa_vec_ctor (array_address, element_count, element_size,
 391                                 constructor, /*destructor=*/NULL);
 392   }
 393
 394   extern "C" void *
 395   __aeabi_vec_ctor_cookie_nodtor (void *array_address,
 396                                   abi::__cxa_cdtor_type constructor,
 397                                   std::size_t element_size,
 398                                   std::size_t element_count)
 399   {
 400     if (array_address == NULL)
 401       return NULL;
 402
 403     array_address = reinterpret_cast<std::size_t *>(array_address) + 2;
 404     reinterpret_cast<std::size_t *>(array_address)[-2] = element_size;
 405     reinterpret_cast<std::size_t *>(array_address)[-1] = element_count;
 406     return abi::__cxa_vec_ctor (array_address,
 407                                 element_count, element_size,
 408                                 constructor, /*destructor=*/NULL);
 409   }
 410
 411   extern "C" void *
 412   __aeabi_vec_cctor_nocookie_nodtor (void *dest_array,
 413                                      void *src_array,
 414                                      std::size_t element_size,
 415                                      std::size_t element_count,
 416                                      void *(*constructor) (void *, void *))
 417   {
 418     return abi::__cxa_vec_cctor (dest_array, src_array,
 419                                  element_count, element_size,
 420                                  constructor, NULL);
 421   }
 422
 423   extern "C" void *
 424   __aeabi_vec_new_cookie_noctor (std::size_t element_size,
 425                                  std::size_t element_count)
 426   {
 427     return abi::__cxa_vec_new(element_count, element_size,
 428                               2 * sizeof (std::size_t),
 429                               /*constructor=*/NULL, /*destructor=*/NULL);
 430   }
 431
 432   extern "C" void *
 433   __aeabi_vec_new_nocookie (std::size_t element_size,
 434                             std::size_t element_count,
 435                             abi::__cxa_cdtor_type constructor)
 436   {
 437     return abi::__cxa_vec_new (element_count, element_size, 0, constructor,
 438                                NULL);
 439   }
 440
 441   extern "C" void *
 442   __aeabi_vec_new_cookie_nodtor (std::size_t element_size,
 443                                  std::size_t element_count,
 444                                  abi::__cxa_cdtor_type constructor)
 445   {
 446     return abi::__cxa_vec_new(element_count, element_size,
 447                               2 * sizeof (std::size_t),
 448                               constructor, NULL);
 449   }
 450
 451   extern "C" void *
 452   __aeabi_vec_new_cookie(std::size_t element_size,
 453                          std::size_t element_count,
 454                          abi::__cxa_cdtor_type constructor,
 455                          abi::__cxa_cdtor_type destructor)
 456   {
 457     return abi::__cxa_vec_new (element_count, element_size,
 458                                2 * sizeof (std::size_t),
 459                                constructor, destructor);
 460   }
 461
 462
 463   extern "C" void *
 464   __aeabi_vec_dtor (void *array_address,
 465                     abi::__cxa_cdtor_type destructor,
 466                     std::size_t element_size,
 467                     std::size_t element_count)
 468   {
 469     abi::__cxa_vec_dtor (array_address, element_count, element_size,
 470                          destructor);
 471     return reinterpret_cast<std::size_t*> (array_address) - 2;
 472   }
 473
 474   extern "C" void *
 475   __aeabi_vec_dtor_cookie (void *array_address,
 476                            abi::__cxa_cdtor_type destructor)
 477   {
 478     if (!array_address)
 479       return NULL;
 480
 481     abi::__cxa_vec_dtor (array_address,
 482                          reinterpret_cast<std::size_t *>(array_address)[-1],
 483                          reinterpret_cast<std::size_t *>(array_address)[-2],
 484                          destructor);
 485     return reinterpret_cast<std::size_t*> (array_address) - 2;
 486   }
 487
 488
 489   extern "C" void
 490   __aeabi_vec_delete (void *array_address,
 491                       abi::__cxa_cdtor_type destructor)
 492   {
 493     if (!array_address)
 494       return;
 495
 496     abi::__cxa_vec_delete (array_address,
 497                            reinterpret_cast<std::size_t *>(array_address)[-2],
 498                            2 * sizeof (std::size_t),
 499                            destructor);
 500   }
 501
 502   extern "C" void
 503   __aeabi_vec_delete3 (void *array_address,
 504                        abi::__cxa_cdtor_type destructor,
 505                        void (*dealloc) (void *, std::size_t))
 506   {
 507     if (!array_address)
 508       return;
 509
 510     abi::__cxa_vec_delete3 (array_address,
 511                             reinterpret_cast<std::size_t *>(array_address)[-2],
 512                             2 * sizeof (std::size_t),
 513                             destructor, dealloc);
 514   }
 515
 516   extern "C" void
 517   __aeabi_vec_delete3_nodtor (void *array_address,
 518                               void (*dealloc) (void *, std::size_t))
 519   {
 520     if (!array_address)
 521       return;
 522
 523     abi::__cxa_vec_delete3 (array_address,
 524                             reinterpret_cast<std::size_t *>(array_address)[-2],
 525                             2 * sizeof (std::size_t),
 526                             /*destructor=*/NULL, dealloc);
 527   }
 528 } // namespace __aeabiv1
 529
 530 #endif // defined(__arm__) && defined(__ARM_EABI__)