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

   1 // New abi Support -*- C++ -*-
   2
   3 // Copyright (C) 2000, 2001, 2003, 2004 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 2, 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 // You should have received a copy of the GNU General Public License
  18 // along with GCC; see the file COPYING.  If not, write to
  19 // the Free Software Foundation, 59 Temple Place - Suite 330,
  20 // Boston, MA 02111-1307, USA.
  21
  22 // As a special exception, you may use this file as part of a free software
  23 // library without restriction.  Specifically, if other files instantiate
  24 // templates or use macros or inline functions from this file, or you compile
  25 // this file and link it with other files to produce an executable, this
  26 // file does not by itself cause the resulting executable to be covered by
  27 // the GNU General Public License.  This exception does not however
  28 // invalidate any other reasons why the executable file might be covered by
  29 // the GNU General Public License.
  30
  31 // Written by Nathan Sidwell, Codesourcery LLC, <nathan@codesourcery.com>
  32
  33 #include <cxxabi.h>
  34 #include <new>
  35 #include <exception>
  36 #include <exception_defines.h>
  37 #include "unwind-cxx.h"
  38
  39 namespace __cxxabiv1
  40 {
  41   namespace
  42   {
  43     struct uncatch_exception
  44     {
  45       uncatch_exception();
  46       ~uncatch_exception () { __cxa_begin_catch (&p->unwindHeader); }
  47
  48       __cxa_exception* p;
  49
  50     private:
  51       uncatch_exception&
  52       operator=(const uncatch_exception&);
  53
  54       uncatch_exception(const uncatch_exception&);
  55     };
  56
  57     uncatch_exception::uncatch_exception() : p(0)
  58     {
  59       __cxa_eh_globals *globals = __cxa_get_globals_fast ();
  60
  61       p = globals->caughtExceptions;
  62       p->handlerCount -= 1;
  63       globals->caughtExceptions = p->nextException;
  64       globals->uncaughtExceptions += 1;
  65     }
  66   }
  67
  68   // Allocate and construct array.
  69   extern "C" void *
  70   __cxa_vec_new(std::size_t element_count,
  71                 std::size_t element_size,
  72                 std::size_t padding_size,
  73                 void (*constructor) (void *),
  74                 void (*destructor) (void *))
  75   {
  76     return __cxa_vec_new2(element_count, element_size, padding_size,
  77                            constructor, destructor,
  78                            &operator new[], &operator delete []);
  79   }
  80
  81   extern "C" void *
  82   __cxa_vec_new2(std::size_t element_count,
  83                  std::size_t element_size,
  84                  std::size_t padding_size,
  85                  void (*constructor) (void *),
  86                  void (*destructor) (void *),
  87                  void *(*alloc) (std::size_t),
  88                  void (*dealloc) (void *))
  89   {
  90     std::size_t size = element_count * element_size + padding_size;
  91     char *base = static_cast <char *> (alloc (size));
  92     if (!base)
  93       return base;
  94
  95     if (padding_size)
  96       {
  97         base += padding_size;
  98         reinterpret_cast <std::size_t *> (base)[-1] = element_count;
  99       }
 100     try
 101       {
 102         __cxa_vec_ctor(base, element_count, element_size,
 103                        constructor, destructor);
 104       }
 105     catch (...)
 106       {
 107         {
 108           uncatch_exception ue;
 109           dealloc(base - padding_size);
 110         }
 111         __throw_exception_again;
 112       }
 113     return base;
 114   }
 115
 116   extern "C" void *
 117   __cxa_vec_new3(std::size_t element_count,
 118                  std::size_t element_size,
 119                  std::size_t padding_size,
 120                  void (*constructor) (void *),
 121                  void (*destructor) (void *),
 122                  void *(*alloc) (std::size_t),
 123                  void (*dealloc) (void *, std::size_t))
 124   {
 125     std::size_t size = element_count * element_size + padding_size;
 126     char *base = static_cast<char *>(alloc (size));
 127     if (!base)
 128       return base;
 129
 130     if (padding_size)
 131       {
 132         base += padding_size;
 133         reinterpret_cast<std::size_t *>(base)[-1] = element_count;
 134       }
 135     try
 136       {
 137         __cxa_vec_ctor(base, element_count, element_size,
 138                        constructor, destructor);
 139       }
 140     catch (...)
 141       {
 142         {
 143           uncatch_exception ue;
 144           dealloc(base - padding_size, size);
 145         }
 146         __throw_exception_again;
 147       }
 148     return base;
 149   }
 150
 151   // Construct array.
 152   extern "C" void
 153   __cxa_vec_ctor(void *array_address,
 154                  std::size_t element_count,
 155                  std::size_t element_size,
 156                  void (*constructor) (void *),
 157                  void (*destructor) (void *))
 158   {
 159     std::size_t ix = 0;
 160     char *ptr = static_cast<char *>(array_address);
 161
 162     try
 163       {
 164         if (constructor)
 165           for (; ix != element_count; ix++, ptr += element_size)
 166             constructor(ptr);
 167       }
 168     catch (...)
 169       {
 170         {
 171           uncatch_exception ue;
 172           __cxa_vec_cleanup(array_address, ix, element_size, destructor);
 173         }
 174         __throw_exception_again;
 175       }
 176   }
 177
 178   // Construct an array by copying.
 179   extern "C" void
 180   __cxa_vec_cctor(void *dest_array,
 181                   void *src_array,
 182                   std::size_t element_count,
 183                   std::size_t element_size,
 184                   void (*constructor) (void *, void *),
 185                   void (*destructor) (void *))
 186   {
 187     std::size_t ix = 0;
 188     char *dest_ptr = static_cast<char *>(dest_array);
 189     char *src_ptr = static_cast<char *>(src_array);
 190
 191     try
 192       {
 193         if (constructor)
 194           for (; ix != element_count;
 195                ix++, src_ptr += element_size, dest_ptr += element_size)
 196             constructor(dest_ptr, src_ptr);
 197       }
 198     catch (...)
 199       {
 200         {
 201           uncatch_exception ue;
 202           __cxa_vec_cleanup(dest_array, ix, element_size, destructor);
 203         }
 204         __throw_exception_again;
 205       }
 206   }
 207
 208   // Destruct array.
 209   extern "C" void
 210   __cxa_vec_dtor(void *array_address,
 211                  std::size_t element_count,
 212                  std::size_t element_size,
 213                  void (*destructor) (void *))
 214   {
 215     if (destructor)
 216       {
 217         char *ptr = static_cast<char *>(array_address);
 218         std::size_t ix = element_count;
 219
 220         ptr += element_count * element_size;
 221
 222         try
 223           {
 224             while (ix--)
 225               {
 226                 ptr -= element_size;
 227                 destructor(ptr);
 228               }
 229           }
 230         catch (...)
 231           {
 232             {
 233               uncatch_exception ue;
 234               __cxa_vec_cleanup(array_address, ix, element_size, destructor);
 235             }
 236             __throw_exception_again;
 237           }
 238       }
 239   }
 240
 241   // Destruct array as a result of throwing an exception.
 242   // [except.ctor]/3 If a destructor called during stack unwinding
 243   // exits with an exception, terminate is called.
 244   extern "C" void
 245   __cxa_vec_cleanup(void *array_address,
 246                     std::size_t element_count,
 247                     std::size_t element_size,
 248                     void (*destructor) (void *))
 249   {
 250     if (destructor)
 251       {
 252         char *ptr = static_cast <char *> (array_address);
 253         std::size_t ix = element_count;
 254
 255         ptr += element_count * element_size;
 256
 257         try
 258           {
 259             while (ix--)
 260               {
 261                 ptr -= element_size;
 262                 destructor(ptr);
 263               }
 264           }
 265         catch (...)
 266           {
 267             std::terminate();
 268           }
 269       }
 270   }
 271
 272   // Destruct and release array.
 273   extern "C" void
 274   __cxa_vec_delete(void *array_address,
 275                    std::size_t element_size,
 276                    std::size_t padding_size,
 277                    void (*destructor) (void *))
 278   {
 279     __cxa_vec_delete2(array_address, element_size, padding_size,
 280                        destructor,
 281                        &operator delete []);
 282   }
 283
 284   extern "C" void
 285   __cxa_vec_delete2(void *array_address,
 286                     std::size_t element_size,
 287                     std::size_t padding_size,
 288                     void (*destructor) (void *),
 289                     void (*dealloc) (void *))
 290   {
 291     if (!array_address)
 292       return;
 293
 294     char* base = static_cast<char *>(array_address);
 295
 296     if (padding_size)
 297       {
 298         std::size_t element_count = reinterpret_cast<std::size_t *>(base)[-1];
 299         base -= padding_size;
 300         try
 301           {
 302             __cxa_vec_dtor(array_address, element_count, element_size,
 303                            destructor);
 304           }
 305         catch (...)
 306           {
 307             {
 308               uncatch_exception ue;
 309               dealloc(base);
 310             }
 311             __throw_exception_again;
 312           }
 313       }
 314     dealloc(base);
 315   }
 316
 317   extern "C" void
 318   __cxa_vec_delete3(void *array_address,
 319                     std::size_t element_size,
 320                     std::size_t padding_size,
 321                      void (*destructor) (void *),
 322                     void (*dealloc) (void *, std::size_t))
 323   {
 324     if (!array_address)
 325       return;
 326
 327     char* base = static_cast <char *> (array_address);
 328     std::size_t size = 0;
 329
 330     if (padding_size)
 331       {
 332         std::size_t element_count = reinterpret_cast<std::size_t *> (base)[-1];
 333         base -= padding_size;
 334         size = element_count * element_size + padding_size;
 335         try
 336           {
 337             __cxa_vec_dtor(array_address, element_count, element_size,
 338                            destructor);
 339           }
 340         catch (...)
 341           {
 342             {
 343               uncatch_exception ue;
 344               dealloc(base, size);
 345             }
 346             __throw_exception_again;
 347           }
 348       }
 349     dealloc(base, size);
 350   }
 351 } // namespace __cxxabiv1
 352