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           // Core issue 901 will probably be resolved such that a
 108           // deleted operator delete means not freeing memory here.
 109           if (dealloc)
 110             dealloc(base - padding_size);
 111         }
 112         __throw_exception_again;
 113       }
 114     return base;
 115   }
 116
 117   extern "C" void *
 118   __cxa_vec_new3(std::size_t element_count,
 119                  std::size_t element_size,
 120                  std::size_t padding_size,
 121                  __cxa_cdtor_type constructor,
 122                  __cxa_cdtor_type destructor,
 123                  void *(*alloc) (std::size_t),
 124                  void (*dealloc) (void *, std::size_t))
 125   {
 126     std::size_t size = element_count * element_size + padding_size;
 127     char *base = static_cast<char *>(alloc (size));
 128     if (!base)
 129       return base;
 130
 131     if (padding_size)
 132       {
 133         base += padding_size;
 134         reinterpret_cast<std::size_t *>(base)[-1] = element_count;
 135 #ifdef _GLIBCXX_ELTSIZE_IN_COOKIE
 136         reinterpret_cast <std::size_t *> (base)[-2] = element_size;
 137 #endif
 138       }
 139     __try
 140       {
 141         __cxa_vec_ctor(base, element_count, element_size,
 142                        constructor, destructor);
 143       }
 144     __catch(...)
 145       {
 146         {
 147           uncatch_exception ue;
 148           if (dealloc)
 149             dealloc(base - padding_size, size);
 150         }
 151         __throw_exception_again;
 152       }
 153     return base;
 154   }
 155
 156   // Construct array.
 157   extern "C" __cxa_vec_ctor_return_type
 158   __cxa_vec_ctor(void *array_address,
 159                  std::size_t element_count,
 160                  std::size_t element_size,
 161                  __cxa_cdtor_type constructor,
 162                  __cxa_cdtor_type destructor)
 163   {
 164     std::size_t ix = 0;
 165     char *ptr = static_cast<char *>(array_address);
 166
 167     __try
 168       {
 169         if (constructor)
 170           for (; ix != element_count; ix++, ptr += element_size)
 171             constructor(ptr);
 172       }
 173     __catch(...)
 174       {
 175         {
 176           uncatch_exception ue;
 177           __cxa_vec_cleanup(array_address, ix, element_size, destructor);
 178         }
 179         __throw_exception_again;
 180       }
 181     _GLIBCXX_CXA_VEC_CTOR_RETURN (array_address);
 182   }
 183
 184   // Construct an array by copying.
 185   extern "C" __cxa_vec_ctor_return_type
 186   __cxa_vec_cctor(void *dest_array,
 187                   void *src_array,
 188                   std::size_t element_count,
 189                   std::size_t element_size,
 190                   __cxa_cdtor_return_type (*constructor) (void *, void *),
 191                   __cxa_cdtor_type destructor)
 192   {
 193     std::size_t ix = 0;
 194     char *dest_ptr = static_cast<char *>(dest_array);
 195     char *src_ptr = static_cast<char *>(src_array);
 196
 197     __try
 198       {
 199         if (constructor)
 200           for (; ix != element_count;
 201                ix++, src_ptr += element_size, dest_ptr += element_size)
 202             constructor(dest_ptr, src_ptr);
 203       }
 204     __catch(...)
 205       {
 206         {
 207           uncatch_exception ue;
 208           __cxa_vec_cleanup(dest_array, ix, element_size, destructor);
 209         }
 210         __throw_exception_again;
 211       }
 212     _GLIBCXX_CXA_VEC_CTOR_RETURN (dest_array);
 213   }
 214
 215   // Destruct array.
 216   extern "C" void
 217   __cxa_vec_dtor(void *array_address,
 218                  std::size_t element_count,
 219                  std::size_t element_size,
 220                  __cxa_cdtor_type destructor)
 221   {
 222     if (destructor)
 223       {
 224         char *ptr = static_cast<char *>(array_address);
 225         std::size_t ix = element_count;
 226
 227         ptr += element_count * element_size;
 228
 229         __try
 230           {
 231             while (ix--)
 232               {
 233                 ptr -= element_size;
 234                 destructor(ptr);
 235               }
 236           }
 237         __catch(...)
 238           {
 239             {
 240               uncatch_exception ue;
 241               __cxa_vec_cleanup(array_address, ix, element_size, destructor);
 242             }
 243             __throw_exception_again;
 244           }
 245       }
 246   }
 247
 248   // Destruct array as a result of throwing an exception.
 249   // [except.ctor]/3 If a destructor called during stack unwinding
 250   // exits with an exception, terminate is called.
 251   extern "C" void
 252   __cxa_vec_cleanup(void *array_address,
 253                     std::size_t element_count,
 254                     std::size_t element_size,
 255                     __cxa_cdtor_type destructor) throw()
 256   {
 257     if (destructor)
 258       {
 259         char *ptr = static_cast <char *> (array_address);
 260         std::size_t ix = element_count;
 261
 262         ptr += element_count * element_size;
 263
 264         __try
 265           {
 266             while (ix--)
 267               {
 268                 ptr -= element_size;
 269                 destructor(ptr);
 270               }
 271           }
 272         __catch(...)
 273           {
 274             std::terminate();
 275           }
 276       }
 277   }
 278
 279   // Destruct and release array.
 280   extern "C" void
 281   __cxa_vec_delete(void *array_address,
 282                    std::size_t element_size,
 283                    std::size_t padding_size,
 284                    __cxa_cdtor_type destructor)
 285   {
 286     __cxa_vec_delete2(array_address, element_size, padding_size,
 287                        destructor,
 288                        &operator delete []);
 289   }
 290
 291   extern "C" void
 292   __cxa_vec_delete2(void *array_address,
 293                     std::size_t element_size,
 294                     std::size_t padding_size,
 295                     __cxa_cdtor_type destructor,
 296                     void (*dealloc) (void *))
 297   {
 298     if (!array_address)
 299       return;
 300
 301     char* base = static_cast<char *>(array_address);
 302
 303     if (padding_size)
 304       {
 305         std::size_t element_count = reinterpret_cast<std::size_t *>(base)[-1];
 306         base -= padding_size;
 307         __try
 308           {
 309             __cxa_vec_dtor(array_address, element_count, element_size,
 310                            destructor);
 311           }
 312         __catch(...)
 313           {
 314             {
 315               uncatch_exception ue;
 316               dealloc(base);
 317             }
 318             __throw_exception_again;
 319           }
 320       }
 321     dealloc(base);
 322   }
 323
 324   extern "C" void
 325   __cxa_vec_delete3(void *array_address,
 326                     std::size_t element_size,
 327                     std::size_t padding_size,
 328                      __cxa_cdtor_type destructor,
 329                     void (*dealloc) (void *, std::size_t))
 330   {
 331     if (!array_address)
 332       return;
 333
 334     char* base = static_cast <char *> (array_address);
 335     std::size_t size = 0;
 336
 337     if (padding_size)
 338       {
 339         std::size_t element_count = reinterpret_cast<std::size_t *> (base)[-1];
 340         base -= padding_size;
 341         size = element_count * element_size + padding_size;
 342         __try
 343           {
 344             __cxa_vec_dtor(array_address, element_count, element_size,
 345                            destructor);
 346           }
 347         __catch(...)
 348           {
 349             {
 350               uncatch_exception ue;
 351               dealloc(base, size);
 352             }
 353             __throw_exception_again;
 354           }
 355       }
 356     dealloc(base, size);
 357   }
 358 } // namespace __cxxabiv1
 359
 360 #if defined(__arm__) && defined(__ARM_EABI__)
 361
 362 // The ARM C++ ABI requires that the library provide these additional
 363 // helper functions.  There are placed in this file, despite being
 364 // architecture-specifier, so that the compiler can inline the __cxa
 365 // functions into these functions as appropriate.
 366
 367 namespace __aeabiv1
 368 {
 369   extern "C" void *
 370   __aeabi_vec_ctor_nocookie_nodtor (void *array_address,
 371                                     abi::__cxa_cdtor_type constructor,
 372                                     std::size_t element_size,
 373                                     std::size_t element_count)
 374   {
 375     return abi::__cxa_vec_ctor (array_address, element_count, element_size,
 376                                 constructor, /*destructor=*/NULL);
 377   }
 378
 379   extern "C" void *
 380   __aeabi_vec_ctor_cookie_nodtor (void *array_address,
 381                                   abi::__cxa_cdtor_type constructor,
 382                                   std::size_t element_size,
 383                                   std::size_t element_count)
 384   {
 385     if (array_address == NULL)
 386       return NULL;
 387
 388     array_address = reinterpret_cast<std::size_t *>(array_address) + 2;
 389     reinterpret_cast<std::size_t *>(array_address)[-2] = element_size;
 390     reinterpret_cast<std::size_t *>(array_address)[-1] = element_count;
 391     return abi::__cxa_vec_ctor (array_address,
 392                                 element_count, element_size,
 393                                 constructor, /*destructor=*/NULL);
 394   }
 395
 396   extern "C" void *
 397   __aeabi_vec_cctor_nocookie_nodtor (void *dest_array,
 398                                      void *src_array,
 399                                      std::size_t element_size,
 400                                      std::size_t element_count,
 401                                      void *(*constructor) (void *, void *))
 402   {
 403     return abi::__cxa_vec_cctor (dest_array, src_array,
 404                                  element_count, element_size,
 405                                  constructor, NULL);
 406   }
 407
 408   extern "C" void *
 409   __aeabi_vec_new_cookie_noctor (std::size_t element_size,
 410                                  std::size_t element_count)
 411   {
 412     return abi::__cxa_vec_new(element_count, element_size,
 413                               2 * sizeof (std::size_t),
 414                               /*constructor=*/NULL, /*destructor=*/NULL);
 415   }
 416
 417   extern "C" void *
 418   __aeabi_vec_new_nocookie (std::size_t element_size,
 419                             std::size_t element_count,
 420                             abi::__cxa_cdtor_type constructor)
 421   {
 422     return abi::__cxa_vec_new (element_count, element_size, 0, constructor,
 423                                NULL);
 424   }
 425
 426   extern "C" void *
 427   __aeabi_vec_new_cookie_nodtor (std::size_t element_size,
 428                                  std::size_t element_count,
 429                                  abi::__cxa_cdtor_type constructor)
 430   {
 431     return abi::__cxa_vec_new(element_count, element_size,
 432                               2 * sizeof (std::size_t),
 433                               constructor, NULL);
 434   }
 435
 436   extern "C" void *
 437   __aeabi_vec_new_cookie(std::size_t element_size,
 438                          std::size_t element_count,
 439                          abi::__cxa_cdtor_type constructor,
 440                          abi::__cxa_cdtor_type destructor)
 441   {
 442     return abi::__cxa_vec_new (element_count, element_size,
 443                                2 * sizeof (std::size_t),
 444                                constructor, destructor);
 445   }
 446
 447
 448   extern "C" void *
 449   __aeabi_vec_dtor (void *array_address,
 450                     abi::__cxa_cdtor_type destructor,
 451                     std::size_t element_size,
 452                     std::size_t element_count)
 453   {
 454     abi::__cxa_vec_dtor (array_address, element_count, element_size,
 455                          destructor);
 456     return reinterpret_cast<std::size_t*> (array_address) - 2;
 457   }
 458
 459   extern "C" void *
 460   __aeabi_vec_dtor_cookie (void *array_address,
 461                            abi::__cxa_cdtor_type destructor)
 462   {
 463     if (!array_address)
 464       return NULL;
 465
 466     abi::__cxa_vec_dtor (array_address,
 467                          reinterpret_cast<std::size_t *>(array_address)[-1],
 468                          reinterpret_cast<std::size_t *>(array_address)[-2],
 469                          destructor);
 470     return reinterpret_cast<std::size_t*> (array_address) - 2;
 471   }
 472
 473
 474   extern "C" void
 475   __aeabi_vec_delete (void *array_address,
 476                       abi::__cxa_cdtor_type destructor)
 477   {
 478     if (!array_address)
 479       return;
 480
 481     abi::__cxa_vec_delete (array_address,
 482                            reinterpret_cast<std::size_t *>(array_address)[-2],
 483                            2 * sizeof (std::size_t),
 484                            destructor);
 485   }
 486
 487   extern "C" void
 488   __aeabi_vec_delete3 (void *array_address,
 489                        abi::__cxa_cdtor_type destructor,
 490                        void (*dealloc) (void *, std::size_t))
 491   {
 492     if (!array_address)
 493       return;
 494
 495     abi::__cxa_vec_delete3 (array_address,
 496                             reinterpret_cast<std::size_t *>(array_address)[-2],
 497                             2 * sizeof (std::size_t),
 498                             destructor, dealloc);
 499   }
 500
 501   extern "C" void
 502   __aeabi_vec_delete3_nodtor (void *array_address,
 503                               void (*dealloc) (void *, std::size_t))
 504   {
 505     if (!array_address)
 506       return;
 507
 508     abi::__cxa_vec_delete3 (array_address,
 509                             reinterpret_cast<std::size_t *>(array_address)[-2],
 510                             2 * sizeof (std::size_t),
 511                             /*destructor=*/NULL, dealloc);
 512   }
 513 } // namespace __aeabiv1
 514
 515 #endif // defined(__arm__) && defined(__ARM_EABI__)