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

   1 // New abi Support -*- C++ -*-
   2
   3 // Copyright (C) 2000, 2001, 2003, 2004, 2009 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 <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
  63   // Allocate and construct array.
  64   extern "C" void *
  65   __cxa_vec_new(std::size_t element_count,
  66                 std::size_t element_size,
  67                 std::size_t padding_size,
  68                 __cxa_cdtor_type constructor,
  69                 __cxa_cdtor_type destructor)
  70   {
  71     return __cxa_vec_new2(element_count, element_size, padding_size,
  72                            constructor, destructor,
  73                            &operator new[], &operator delete []);
  74   }
  75
  76   extern "C" void *
  77   __cxa_vec_new2(std::size_t element_count,
  78                  std::size_t element_size,
  79                  std::size_t padding_size,
  80                  __cxa_cdtor_type constructor,
  81                  __cxa_cdtor_type destructor,
  82                  void *(*alloc) (std::size_t),
  83                  void (*dealloc) (void *))
  84   {
  85     std::size_t size = element_count * element_size + padding_size;
  86     char *base = static_cast <char *> (alloc (size));
  87     if (!base)
  88       return base;
  89
  90     if (padding_size)
  91       {
  92         base += padding_size;
  93         reinterpret_cast <std::size_t *> (base)[-1] = element_count;
  94 #ifdef _GLIBCXX_ELTSIZE_IN_COOKIE
  95         reinterpret_cast <std::size_t *> (base)[-2] = element_size;
  96 #endif
  97       }
  98     try
  99       {
 100         __cxa_vec_ctor(base, element_count, element_size,
 101                        constructor, destructor);
 102       }
 103     catch (...)
 104       {
 105         {
 106           uncatch_exception ue;
 107           dealloc(base - padding_size);
 108         }
 109         __throw_exception_again;
 110       }
 111     return base;
 112   }
 113
 114   extern "C" void *
 115   __cxa_vec_new3(std::size_t element_count,
 116                  std::size_t element_size,
 117                  std::size_t padding_size,
 118                  __cxa_cdtor_type constructor,
 119                  __cxa_cdtor_type destructor,
 120                  void *(*alloc) (std::size_t),
 121                  void (*dealloc) (void *, std::size_t))
 122   {
 123     std::size_t size = element_count * element_size + padding_size;
 124     char *base = static_cast<char *>(alloc (size));
 125     if (!base)
 126       return base;
 127
 128     if (padding_size)
 129       {
 130         base += padding_size;
 131         reinterpret_cast<std::size_t *>(base)[-1] = element_count;
 132 #ifdef _GLIBCXX_ELTSIZE_IN_COOKIE
 133         reinterpret_cast <std::size_t *> (base)[-2] = element_size;
 134 #endif
 135       }
 136     try
 137       {
 138         __cxa_vec_ctor(base, element_count, element_size,
 139                        constructor, destructor);
 140       }
 141     catch (...)
 142       {
 143         {
 144           uncatch_exception ue;
 145           dealloc(base - padding_size, size);
 146         }
 147         __throw_exception_again;
 148       }
 149     return base;
 150   }
 151
 152   // Construct array.
 153   extern "C" __cxa_vec_ctor_return_type
 154   __cxa_vec_ctor(void *array_address,
 155                  std::size_t element_count,
 156                  std::size_t element_size,
 157                  __cxa_cdtor_type constructor,
 158                  __cxa_cdtor_type destructor)
 159   {
 160     std::size_t ix = 0;
 161     char *ptr = static_cast<char *>(array_address);
 162
 163     try
 164       {
 165         if (constructor)
 166           for (; ix != element_count; ix++, ptr += element_size)
 167             constructor(ptr);
 168       }
 169     catch (...)
 170       {
 171         {
 172           uncatch_exception ue;
 173           __cxa_vec_cleanup(array_address, ix, element_size, destructor);
 174         }
 175         __throw_exception_again;
 176       }
 177     _GLIBCXX_CXA_VEC_CTOR_RETURN (array_address);
 178   }
 179
 180   // Construct an array by copying.
 181   extern "C" __cxa_vec_ctor_return_type
 182   __cxa_vec_cctor(void *dest_array,
 183                   void *src_array,
 184                   std::size_t element_count,
 185                   std::size_t element_size,
 186                   __cxa_cdtor_return_type (*constructor) (void *, void *),
 187                   __cxa_cdtor_type destructor)
 188   {
 189     std::size_t ix = 0;
 190     char *dest_ptr = static_cast<char *>(dest_array);
 191     char *src_ptr = static_cast<char *>(src_array);
 192
 193     try
 194       {
 195         if (constructor)
 196           for (; ix != element_count;
 197                ix++, src_ptr += element_size, dest_ptr += element_size)
 198             constructor(dest_ptr, src_ptr);
 199       }
 200     catch (...)
 201       {
 202         {
 203           uncatch_exception ue;
 204           __cxa_vec_cleanup(dest_array, ix, element_size, destructor);
 205         }
 206         __throw_exception_again;
 207       }
 208     _GLIBCXX_CXA_VEC_CTOR_RETURN (dest_array);
 209   }
 210
 211   // Destruct array.
 212   extern "C" void
 213   __cxa_vec_dtor(void *array_address,
 214                  std::size_t element_count,
 215                  std::size_t element_size,
 216                  __cxa_cdtor_type destructor)
 217   {
 218     if (destructor)
 219       {
 220         char *ptr = static_cast<char *>(array_address);
 221         std::size_t ix = element_count;
 222
 223         ptr += element_count * element_size;
 224
 225         try
 226           {
 227             while (ix--)
 228               {
 229                 ptr -= element_size;
 230                 destructor(ptr);
 231               }
 232           }
 233         catch (...)
 234           {
 235             {
 236               uncatch_exception ue;
 237               __cxa_vec_cleanup(array_address, ix, element_size, destructor);
 238             }
 239             __throw_exception_again;
 240           }
 241       }
 242   }
 243
 244   // Destruct array as a result of throwing an exception.
 245   // [except.ctor]/3 If a destructor called during stack unwinding
 246   // exits with an exception, terminate is called.
 247   extern "C" void
 248   __cxa_vec_cleanup(void *array_address,
 249                     std::size_t element_count,
 250                     std::size_t element_size,
 251                     __cxa_cdtor_type destructor)
 252   {
 253     if (destructor)
 254       {
 255         char *ptr = static_cast <char *> (array_address);
 256         std::size_t ix = element_count;
 257
 258         ptr += element_count * element_size;
 259
 260         try
 261           {
 262             while (ix--)
 263               {
 264                 ptr -= element_size;
 265                 destructor(ptr);
 266               }
 267           }
 268         catch (...)
 269           {
 270             std::terminate();
 271           }
 272       }
 273   }
 274
 275   // Destruct and release array.
 276   extern "C" void
 277   __cxa_vec_delete(void *array_address,
 278                    std::size_t element_size,
 279                    std::size_t padding_size,
 280                    __cxa_cdtor_type destructor)
 281   {
 282     __cxa_vec_delete2(array_address, element_size, padding_size,
 283                        destructor,
 284                        &operator delete []);
 285   }
 286
 287   extern "C" void
 288   __cxa_vec_delete2(void *array_address,
 289                     std::size_t element_size,
 290                     std::size_t padding_size,
 291                     __cxa_cdtor_type destructor,
 292                     void (*dealloc) (void *))
 293   {
 294     if (!array_address)
 295       return;
 296
 297     char* base = static_cast<char *>(array_address);
 298
 299     if (padding_size)
 300       {
 301         std::size_t element_count = reinterpret_cast<std::size_t *>(base)[-1];
 302         base -= padding_size;
 303         try
 304           {
 305             __cxa_vec_dtor(array_address, element_count, element_size,
 306                            destructor);
 307           }
 308         catch (...)
 309           {
 310             {
 311               uncatch_exception ue;
 312               dealloc(base);
 313             }
 314             __throw_exception_again;
 315           }
 316       }
 317     dealloc(base);
 318   }
 319
 320   extern "C" void
 321   __cxa_vec_delete3(void *array_address,
 322                     std::size_t element_size,
 323                     std::size_t padding_size,
 324                      __cxa_cdtor_type destructor,
 325                     void (*dealloc) (void *, std::size_t))
 326   {
 327     if (!array_address)
 328       return;
 329
 330     char* base = static_cast <char *> (array_address);
 331     std::size_t size = 0;
 332
 333     if (padding_size)
 334       {
 335         std::size_t element_count = reinterpret_cast<std::size_t *> (base)[-1];
 336         base -= padding_size;
 337         size = element_count * element_size + padding_size;
 338         try
 339           {
 340             __cxa_vec_dtor(array_address, element_count, element_size,
 341                            destructor);
 342           }
 343         catch (...)
 344           {
 345             {
 346               uncatch_exception ue;
 347               dealloc(base, size);
 348             }
 349             __throw_exception_again;
 350           }
 351       }
 352     dealloc(base, size);
 353   }
 354 } // namespace __cxxabiv1
 355
 356 #if defined(__arm__) && defined(__ARM_EABI__)
 357
 358 // The ARM C++ ABI requires that the library provide these additional
 359 // helper functions.  There are placed in this file, despite being
 360 // architecture-specifier, so that the compiler can inline the __cxa
 361 // functions into these functions as appropriate.
 362
 363 namespace __aeabiv1
 364 {
 365   extern "C" void *
 366   __aeabi_vec_ctor_nocookie_nodtor (void *array_address,
 367                                     abi::__cxa_cdtor_type constructor,
 368                                     std::size_t element_size,
 369                                     std::size_t element_count)
 370   {
 371     return abi::__cxa_vec_ctor (array_address, element_count, element_size,
 372                                 constructor, /*destructor=*/NULL);
 373   }
 374
 375   extern "C" void *
 376   __aeabi_vec_ctor_cookie_nodtor (void *array_address,
 377                                   abi::__cxa_cdtor_type constructor,
 378                                   std::size_t element_size,
 379                                   std::size_t element_count)
 380   {
 381     if (array_address == NULL)
 382       return NULL;
 383
 384     array_address = reinterpret_cast<std::size_t *>(array_address) + 2;
 385     reinterpret_cast<std::size_t *>(array_address)[-2] = element_size;
 386     reinterpret_cast<std::size_t *>(array_address)[-1] = element_count;
 387     return abi::__cxa_vec_ctor (array_address,
 388                                 element_count, element_size,
 389                                 constructor, /*destructor=*/NULL);
 390   }
 391
 392   extern "C" void *
 393   __aeabi_vec_cctor_nocookie_nodtor (void *dest_array,
 394                                      void *src_array,
 395                                      std::size_t element_size,
 396                                      std::size_t element_count,
 397                                      void *(*constructor) (void *, void *))
 398   {
 399     return abi::__cxa_vec_cctor (dest_array, src_array,
 400                                  element_count, element_size,
 401                                  constructor, NULL);
 402   }
 403
 404   extern "C" void *
 405   __aeabi_vec_new_cookie_noctor (std::size_t element_size,
 406                                  std::size_t element_count)
 407   {
 408     return abi::__cxa_vec_new(element_count, element_size,
 409                               2 * sizeof (std::size_t),
 410                               /*constructor=*/NULL, /*destructor=*/NULL);
 411   }
 412
 413   extern "C" void *
 414   __aeabi_vec_new_nocookie (std::size_t element_size,
 415                             std::size_t element_count,
 416                             abi::__cxa_cdtor_type constructor)
 417   {
 418     return abi::__cxa_vec_new (element_count, element_size, 0, constructor,
 419                                NULL);
 420   }
 421
 422   extern "C" void *
 423   __aeabi_vec_new_cookie_nodtor (std::size_t element_size,
 424                                  std::size_t element_count,
 425                                  abi::__cxa_cdtor_type constructor)
 426   {
 427     return abi::__cxa_vec_new(element_count, element_size,
 428                               2 * sizeof (std::size_t),
 429                               constructor, NULL);
 430   }
 431
 432   extern "C" void *
 433   __aeabi_vec_new_cookie(std::size_t element_size,
 434                          std::size_t element_count,
 435                          abi::__cxa_cdtor_type constructor,
 436                          abi::__cxa_cdtor_type destructor)
 437   {
 438     return abi::__cxa_vec_new (element_count, element_size,
 439                                2 * sizeof (std::size_t),
 440                                constructor, destructor);
 441   }
 442
 443
 444   extern "C" void *
 445   __aeabi_vec_dtor (void *array_address,
 446                     abi::__cxa_cdtor_type destructor,
 447                     std::size_t element_size,
 448                     std::size_t element_count)
 449   {
 450     abi::__cxa_vec_dtor (array_address, element_count, element_size,
 451                          destructor);
 452     return reinterpret_cast<std::size_t*> (array_address) - 2;
 453   }
 454
 455   extern "C" void *
 456   __aeabi_vec_dtor_cookie (void *array_address,
 457                            abi::__cxa_cdtor_type destructor)
 458   {
 459     if (!array_address)
 460       return NULL;
 461
 462     abi::__cxa_vec_dtor (array_address,
 463                          reinterpret_cast<std::size_t *>(array_address)[-1],
 464                          reinterpret_cast<std::size_t *>(array_address)[-2],
 465                          destructor);
 466     return reinterpret_cast<std::size_t*> (array_address) - 2;
 467   }
 468
 469
 470   extern "C" void
 471   __aeabi_vec_delete (void *array_address,
 472                       abi::__cxa_cdtor_type destructor)
 473   {
 474     if (!array_address)
 475       return;
 476
 477     abi::__cxa_vec_delete (array_address,
 478                            reinterpret_cast<std::size_t *>(array_address)[-2],
 479                            2 * sizeof (std::size_t),
 480                            destructor);
 481   }
 482
 483   extern "C" void
 484   __aeabi_vec_delete3 (void *array_address,
 485                        abi::__cxa_cdtor_type destructor,
 486                        void (*dealloc) (void *, std::size_t))
 487   {
 488     if (!array_address)
 489       return;
 490
 491     abi::__cxa_vec_delete3 (array_address,
 492                             reinterpret_cast<std::size_t *>(array_address)[-2],
 493                             2 * sizeof (std::size_t),
 494                             destructor, dealloc);
 495   }
 496
 497   extern "C" void
 498   __aeabi_vec_delete3_nodtor (void *array_address,
 499                               void (*dealloc) (void *, std::size_t))
 500   {
 501     if (!array_address)
 502       return;
 503
 504     abi::__cxa_vec_delete3 (array_address,
 505                             reinterpret_cast<std::size_t *>(array_address)[-2],
 506                             2 * sizeof (std::size_t),
 507                             /*destructor=*/NULL, dealloc);
 508   }
 509 } // namespace __aeabiv1
 510
 511 #endif // defined(__arm__) && defined(__ARM_EABI__)