libstdc++-v3/src/locale_init.cc

   1 // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
   2 // 2009, 2010
   3 // Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // Under Section 7 of GPL version 3, you are granted additional
  17 // permissions described in the GCC Runtime Library Exception, version
  18 // 3.1, as published by the Free Software Foundation.
  19
  20 // You should have received a copy of the GNU General Public License and
  21 // a copy of the GCC Runtime Library Exception along with this program;
  22 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  23 // <http://www.gnu.org/licenses/>.
  24
  25 #include <clocale>
  26 #include <cstring>
  27 #include <cstdlib>     // For getenv, free.
  28 #include <cctype>
  29 #include <cwctype>     // For towupper, etc.
  30 #include <locale>
  31 #include <ext/concurrence.h>
  32
  33 namespace
  34 {
  35   __gnu_cxx::__mutex&
  36   get_locale_mutex()
  37   {
  38     static __gnu_cxx::__mutex locale_mutex;
  39     return locale_mutex;
  40   }
  41
  42   using namespace std;
  43
  44   typedef char fake_locale_Impl[sizeof(locale::_Impl)]
  45   __attribute__ ((aligned(__alignof__(locale::_Impl))));
  46   fake_locale_Impl c_locale_impl;
  47
  48   typedef char fake_locale[sizeof(locale)]
  49   __attribute__ ((aligned(__alignof__(locale))));
  50   fake_locale c_locale;
  51
  52   typedef char fake_name_vec[sizeof(char*)]
  53   __attribute__ ((aligned(__alignof__(char*))));
  54   fake_name_vec name_vec[6 + _GLIBCXX_NUM_CATEGORIES];
  55
  56   typedef char fake_names[sizeof(char[2])]
  57   __attribute__ ((aligned(__alignof__(char[2]))));
  58   fake_names name_c[6 + _GLIBCXX_NUM_CATEGORIES];
  59
  60   typedef char fake_facet_vec[sizeof(locale::facet*)]
  61   __attribute__ ((aligned(__alignof__(locale::facet*))));
  62   fake_facet_vec facet_vec[_GLIBCXX_NUM_FACETS];
  63
  64   typedef char fake_cache_vec[sizeof(locale::facet*)]
  65   __attribute__ ((aligned(__alignof__(locale::facet*))));
  66   fake_cache_vec cache_vec[_GLIBCXX_NUM_FACETS];
  67
  68   typedef char fake_ctype_c[sizeof(std::ctype<char>)]
  69   __attribute__ ((aligned(__alignof__(std::ctype<char>))));
  70   fake_ctype_c ctype_c;
  71
  72   typedef char fake_collate_c[sizeof(std::collate<char>)]
  73   __attribute__ ((aligned(__alignof__(std::collate<char>))));
  74   fake_collate_c collate_c;
  75
  76   typedef char fake_numpunct_c[sizeof(numpunct<char>)]
  77   __attribute__ ((aligned(__alignof__(numpunct<char>))));
  78   fake_numpunct_c numpunct_c;
  79
  80   typedef char fake_num_get_c[sizeof(num_get<char>)]
  81   __attribute__ ((aligned(__alignof__(num_get<char>))));
  82   fake_num_get_c num_get_c;
  83
  84   typedef char fake_num_put_c[sizeof(num_put<char>)]
  85   __attribute__ ((aligned(__alignof__(num_put<char>))));
  86   fake_num_put_c num_put_c;
  87
  88   typedef char fake_codecvt_c[sizeof(codecvt<char, char, mbstate_t>)]
  89   __attribute__ ((aligned(__alignof__(codecvt<char, char, mbstate_t>))));
  90   fake_codecvt_c codecvt_c;
  91
  92   typedef char fake_moneypunct_c[sizeof(moneypunct<char, true>)]
  93   __attribute__ ((aligned(__alignof__(moneypunct<char, true>))));
  94   fake_moneypunct_c moneypunct_ct;
  95   fake_moneypunct_c moneypunct_cf;
  96
  97   typedef char fake_money_get_c[sizeof(money_get<char>)]
  98   __attribute__ ((aligned(__alignof__(money_get<char>))));
  99   fake_money_get_c money_get_c;
 100
 101   typedef char fake_money_put_c[sizeof(money_put<char>)]
 102   __attribute__ ((aligned(__alignof__(money_put<char>))));
 103   fake_money_put_c money_put_c;
 104
 105   typedef char fake_timepunct_c[sizeof(__timepunct<char>)]
 106   __attribute__ ((aligned(__alignof__(__timepunct<char>))));
 107   fake_timepunct_c timepunct_c;
 108
 109   typedef char fake_time_get_c[sizeof(time_get<char>)]
 110   __attribute__ ((aligned(__alignof__(time_get<char>))));
 111   fake_time_get_c time_get_c;
 112
 113   typedef char fake_time_put_c[sizeof(time_put<char>)]
 114   __attribute__ ((aligned(__alignof__(time_put<char>))));
 115   fake_time_put_c time_put_c;
 116
 117   typedef char fake_messages_c[sizeof(messages<char>)]
 118   __attribute__ ((aligned(__alignof__(messages<char>))));
 119   fake_messages_c messages_c;
 120
 121 #ifdef  _GLIBCXX_USE_WCHAR_T
 122   typedef char fake_wtype_w[sizeof(std::ctype<wchar_t>)]
 123   __attribute__ ((aligned(__alignof__(std::ctype<wchar_t>))));
 124   fake_wtype_w ctype_w;
 125
 126   typedef char fake_wollate_w[sizeof(std::collate<wchar_t>)]
 127   __attribute__ ((aligned(__alignof__(std::collate<wchar_t>))));
 128   fake_wollate_w collate_w;
 129
 130   typedef char fake_numpunct_w[sizeof(numpunct<wchar_t>)]
 131   __attribute__ ((aligned(__alignof__(numpunct<wchar_t>))));
 132   fake_numpunct_w numpunct_w;
 133
 134   typedef char fake_num_get_w[sizeof(num_get<wchar_t>)]
 135   __attribute__ ((aligned(__alignof__(num_get<wchar_t>))));
 136   fake_num_get_w num_get_w;
 137
 138   typedef char fake_num_put_w[sizeof(num_put<wchar_t>)]
 139   __attribute__ ((aligned(__alignof__(num_put<wchar_t>))));
 140   fake_num_put_w num_put_w;
 141
 142   typedef char fake_wodecvt_w[sizeof(codecvt<wchar_t, char, mbstate_t>)]
 143   __attribute__ ((aligned(__alignof__(codecvt<wchar_t, char, mbstate_t>))));
 144   fake_wodecvt_w codecvt_w;
 145
 146   typedef char fake_moneypunct_w[sizeof(moneypunct<wchar_t, true>)]
 147   __attribute__ ((aligned(__alignof__(moneypunct<wchar_t, true>))));
 148   fake_moneypunct_w moneypunct_wt;
 149   fake_moneypunct_w moneypunct_wf;
 150
 151   typedef char fake_money_get_w[sizeof(money_get<wchar_t>)]
 152   __attribute__ ((aligned(__alignof__(money_get<wchar_t>))));
 153   fake_money_get_w money_get_w;
 154
 155   typedef char fake_money_put_w[sizeof(money_put<wchar_t>)]
 156   __attribute__ ((aligned(__alignof__(money_put<wchar_t>))));
 157   fake_money_put_w money_put_w;
 158
 159   typedef char fake_timepunct_w[sizeof(__timepunct<wchar_t>)]
 160   __attribute__ ((aligned(__alignof__(__timepunct<wchar_t>))));
 161   fake_timepunct_w timepunct_w;
 162
 163   typedef char fake_time_get_w[sizeof(time_get<wchar_t>)]
 164   __attribute__ ((aligned(__alignof__(time_get<wchar_t>))));
 165   fake_time_get_w time_get_w;
 166
 167   typedef char fake_time_put_w[sizeof(time_put<wchar_t>)]
 168   __attribute__ ((aligned(__alignof__(time_put<wchar_t>))));
 169   fake_time_put_w time_put_w;
 170
 171   typedef char fake_messages_w[sizeof(messages<wchar_t>)]
 172   __attribute__ ((aligned(__alignof__(messages<wchar_t>))));
 173   fake_messages_w messages_w;
 174 #endif
 175
 176   // Storage for "C" locale caches.
 177   typedef char fake_num_cache_c[sizeof(std::__numpunct_cache<char>)]
 178   __attribute__ ((aligned(__alignof__(std::__numpunct_cache<char>))));
 179   fake_num_cache_c numpunct_cache_c;
 180
 181   typedef char fake_money_cache_c[sizeof(std::__moneypunct_cache<char, true>)]
 182   __attribute__ ((aligned(__alignof__(std::__moneypunct_cache<char, true>))));
 183   fake_money_cache_c moneypunct_cache_ct;
 184   fake_money_cache_c moneypunct_cache_cf;
 185
 186   typedef char fake_time_cache_c[sizeof(std::__timepunct_cache<char>)]
 187   __attribute__ ((aligned(__alignof__(std::__timepunct_cache<char>))));
 188   fake_time_cache_c timepunct_cache_c;
 189
 190 #ifdef _GLIBCXX_USE_WCHAR_T
 191   typedef char fake_num_cache_w[sizeof(std::__numpunct_cache<wchar_t>)]
 192   __attribute__ ((aligned(__alignof__(std::__numpunct_cache<wchar_t>))));
 193   fake_num_cache_w numpunct_cache_w;
 194
 195   typedef char fake_money_cache_w[sizeof(std::__moneypunct_cache<wchar_t,true>)]
 196   __attribute__ ((aligned(__alignof__(std::__moneypunct_cache<wchar_t,true>))));
 197   fake_money_cache_w moneypunct_cache_wt;
 198   fake_money_cache_w moneypunct_cache_wf;
 199
 200   typedef char fake_time_cache_w[sizeof(std::__timepunct_cache<wchar_t>)]
 201   __attribute__ ((aligned(__alignof__(std::__timepunct_cache<wchar_t>))));
 202   fake_time_cache_w timepunct_cache_w;
 203 #endif
 204 } // anonymous namespace
 205
 206 _GLIBCXX_BEGIN_NAMESPACE(std)
 207
 208   locale::locale() throw() : _M_impl(0)
 209   {
 210     _S_initialize();
 211
 212     // Checked locking to optimize the common case where _S_global
 213     // still points to _S_classic (locale::_S_initialize_once()):
 214     // - If they are the same, just increment the reference count and
 215     //   we are done.  This effectively constructs a C locale object
 216     //   identical to the static c_locale.
 217     // - Otherwise, _S_global can and may be destroyed due to
 218     //   locale::global() call on another thread, in which case we
 219     //   fall back to lock protected access to both _S_global and
 220     //   its reference count.
 221     _M_impl = _S_global;
 222     if (_M_impl == _S_classic)
 223       _M_impl->_M_add_reference();
 224     else
 225       {
 226         __gnu_cxx::__scoped_lock sentry(get_locale_mutex());
 227         _S_global->_M_add_reference();
 228         _M_impl = _S_global;
 229       }
 230   }
 231
 232   locale
 233   locale::global(const locale& __other)
 234   {
 235     _S_initialize();
 236     _Impl* __old;
 237     {
 238       __gnu_cxx::__scoped_lock sentry(get_locale_mutex());
 239       __old = _S_global;
 240       __other._M_impl->_M_add_reference();
 241       _S_global = __other._M_impl;
 242       const string __other_name = __other.name();
 243       if (__other_name != "*")
 244         setlocale(LC_ALL, __other_name.c_str());
 245     }
 246
 247     // Reference count sanity check: one reference removed for the
 248     // subsition of __other locale, one added by return-by-value. Net
 249     // difference: zero. When the returned locale object's destrutor
 250     // is called, then the reference count is decremented and possibly
 251     // destroyed.
 252     return locale(__old);
 253   }
 254
 255   const locale&
 256   locale::classic()
 257   {
 258     _S_initialize();
 259     return *(new (&c_locale) locale(_S_classic));
 260   }
 261
 262   void
 263   locale::_S_initialize_once() throw()
 264   {
 265     // 2 references.
 266     // One reference for _S_classic, one for _S_global
 267     _S_classic = new (&c_locale_impl) _Impl(2);
 268     _S_global = _S_classic;
 269   }
 270
 271   void
 272   locale::_S_initialize()
 273   {
 274 #ifdef __GTHREADS
 275     if (__gthread_active_p())
 276       __gthread_once(&_S_once, _S_initialize_once);
 277 #endif
 278     if (!_S_classic)
 279       _S_initialize_once();
 280   }
 281
 282   // Definitions for static const data members of locale::_Impl
 283   const locale::id* const
 284   locale::_Impl::_S_id_ctype[] =
 285   {
 286     &std::ctype<char>::id,
 287     &codecvt<char, char, mbstate_t>::id,
 288 #ifdef _GLIBCXX_USE_WCHAR_T
 289     &std::ctype<wchar_t>::id,
 290     &codecvt<wchar_t, char, mbstate_t>::id,
 291 #endif
 292     0
 293   };
 294
 295   const locale::id* const
 296   locale::_Impl::_S_id_numeric[] =
 297   {
 298     &num_get<char>::id,
 299     &num_put<char>::id,
 300     &numpunct<char>::id,
 301 #ifdef _GLIBCXX_USE_WCHAR_T
 302     &num_get<wchar_t>::id,
 303     &num_put<wchar_t>::id,
 304     &numpunct<wchar_t>::id,
 305 #endif
 306     0
 307   };
 308
 309   const locale::id* const
 310   locale::_Impl::_S_id_collate[] =
 311   {
 312     &std::collate<char>::id,
 313 #ifdef _GLIBCXX_USE_WCHAR_T
 314     &std::collate<wchar_t>::id,
 315 #endif
 316     0
 317   };
 318
 319   const locale::id* const
 320   locale::_Impl::_S_id_time[] =
 321   {
 322     &__timepunct<char>::id,
 323     &time_get<char>::id,
 324     &time_put<char>::id,
 325 #ifdef _GLIBCXX_USE_WCHAR_T
 326     &__timepunct<wchar_t>::id,
 327     &time_get<wchar_t>::id,
 328     &time_put<wchar_t>::id,
 329 #endif
 330     0
 331   };
 332
 333   const locale::id* const
 334   locale::_Impl::_S_id_monetary[] =
 335   {
 336     &money_get<char>::id,
 337     &money_put<char>::id,
 338     &moneypunct<char, false>::id,
 339     &moneypunct<char, true >::id,
 340 #ifdef _GLIBCXX_USE_WCHAR_T
 341     &money_get<wchar_t>::id,
 342     &money_put<wchar_t>::id,
 343     &moneypunct<wchar_t, false>::id,
 344     &moneypunct<wchar_t, true >::id,
 345 #endif
 346     0
 347   };
 348
 349   const locale::id* const
 350   locale::_Impl::_S_id_messages[] =
 351   {
 352     &std::messages<char>::id,
 353 #ifdef _GLIBCXX_USE_WCHAR_T
 354     &std::messages<wchar_t>::id,
 355 #endif
 356     0
 357   };
 358
 359   const locale::id* const* const
 360   locale::_Impl::_S_facet_categories[] =
 361   {
 362     // Order must match the decl order in class locale.
 363     locale::_Impl::_S_id_ctype,
 364     locale::_Impl::_S_id_numeric,
 365     locale::_Impl::_S_id_collate,
 366     locale::_Impl::_S_id_time,
 367     locale::_Impl::_S_id_monetary,
 368     locale::_Impl::_S_id_messages,
 369     0
 370   };
 371
 372   // Construct "C" _Impl.
 373   locale::_Impl::
 374   _Impl(size_t __refs) throw()
 375   : _M_refcount(__refs), _M_facets(0), _M_facets_size(_GLIBCXX_NUM_FACETS),
 376   _M_caches(0), _M_names(0)
 377   {
 378     _M_facets = new (&facet_vec) const facet*[_M_facets_size];
 379     _M_caches = new (&cache_vec) const facet*[_M_facets_size];
 380     for (size_t __i = 0; __i < _M_facets_size; ++__i)
 381       _M_facets[__i] = _M_caches[__i] = 0;
 382
 383     // Name the categories.
 384     _M_names = new (&name_vec) char*[_S_categories_size];
 385     _M_names[0] = new (&name_c[0]) char[2];
 386     std::memcpy(_M_names[0], locale::facet::_S_get_c_name(), 2);
 387     for (size_t __j = 1; __j < _S_categories_size; ++__j)
 388       _M_names[__j] = 0;
 389
 390     // This is needed as presently the C++ version of "C" locales
 391     // != data in the underlying locale model for __timepunct,
 392     // numpunct, and moneypunct. Also, the "C" locales must be
 393     // constructed in a way such that they are pre-allocated.
 394     // NB: Set locale::facets(ref) count to one so that each individual
 395     // facet is not destroyed when the locale (and thus locale::_Impl) is
 396     // destroyed.
 397     _M_init_facet(new (&ctype_c) std::ctype<char>(0, false, 1));
 398     _M_init_facet(new (&codecvt_c) codecvt<char, char, mbstate_t>(1));
 399
 400     typedef __numpunct_cache<char> num_cache_c;
 401     num_cache_c* __npc = new (&numpunct_cache_c) num_cache_c(2);
 402     _M_init_facet(new (&numpunct_c) numpunct<char>(__npc, 1));
 403
 404     _M_init_facet(new (&num_get_c) num_get<char>(1));
 405     _M_init_facet(new (&num_put_c) num_put<char>(1));
 406     _M_init_facet(new (&collate_c) std::collate<char>(1));
 407
 408     typedef __moneypunct_cache<char, false> money_cache_cf;
 409     typedef __moneypunct_cache<char, true> money_cache_ct;
 410     money_cache_cf* __mpcf = new (&moneypunct_cache_cf) money_cache_cf(2);
 411     _M_init_facet(new (&moneypunct_cf) moneypunct<char, false>(__mpcf, 1));
 412     money_cache_ct* __mpct = new (&moneypunct_cache_ct) money_cache_ct(2);
 413     _M_init_facet(new (&moneypunct_ct) moneypunct<char, true>(__mpct, 1));
 414
 415     _M_init_facet(new (&money_get_c) money_get<char>(1));
 416     _M_init_facet(new (&money_put_c) money_put<char>(1));
 417
 418     typedef __timepunct_cache<char> time_cache_c;
 419     time_cache_c* __tpc = new (&timepunct_cache_c) time_cache_c(2);
 420     _M_init_facet(new (&timepunct_c) __timepunct<char>(__tpc, 1));
 421
 422     _M_init_facet(new (&time_get_c) time_get<char>(1));
 423     _M_init_facet(new (&time_put_c) time_put<char>(1));
 424     _M_init_facet(new (&messages_c) std::messages<char>(1));
 425
 426 #ifdef  _GLIBCXX_USE_WCHAR_T
 427     _M_init_facet(new (&ctype_w) std::ctype<wchar_t>(1));
 428     _M_init_facet(new (&codecvt_w) codecvt<wchar_t, char, mbstate_t>(1));
 429
 430     typedef __numpunct_cache<wchar_t> num_cache_w;
 431     num_cache_w* __npw = new (&numpunct_cache_w) num_cache_w(2);
 432     _M_init_facet(new (&numpunct_w) numpunct<wchar_t>(__npw, 1));
 433
 434     _M_init_facet(new (&num_get_w) num_get<wchar_t>(1));
 435     _M_init_facet(new (&num_put_w) num_put<wchar_t>(1));
 436     _M_init_facet(new (&collate_w) std::collate<wchar_t>(1));
 437
 438     typedef __moneypunct_cache<wchar_t, false> money_cache_wf;
 439     typedef __moneypunct_cache<wchar_t, true> money_cache_wt;
 440     money_cache_wf* __mpwf = new (&moneypunct_cache_wf) money_cache_wf(2);
 441     _M_init_facet(new (&moneypunct_wf) moneypunct<wchar_t, false>(__mpwf, 1));
 442     money_cache_wt* __mpwt = new (&moneypunct_cache_wt) money_cache_wt(2);
 443     _M_init_facet(new (&moneypunct_wt) moneypunct<wchar_t, true>(__mpwt, 1));
 444
 445     _M_init_facet(new (&money_get_w) money_get<wchar_t>(1));
 446     _M_init_facet(new (&money_put_w) money_put<wchar_t>(1));
 447
 448     typedef __timepunct_cache<wchar_t> time_cache_w;
 449     time_cache_w* __tpw = new (&timepunct_cache_w) time_cache_w(2);
 450     _M_init_facet(new (&timepunct_w) __timepunct<wchar_t>(__tpw, 1));
 451
 452     _M_init_facet(new (&time_get_w) time_get<wchar_t>(1));
 453     _M_init_facet(new (&time_put_w) time_put<wchar_t>(1));
 454     _M_init_facet(new (&messages_w) std::messages<wchar_t>(1));
 455 #endif
 456
 457     // This locale is safe to pre-cache, after all the facets have
 458     // been created and installed.
 459     _M_caches[numpunct<char>::id._M_id()] = __npc;
 460     _M_caches[moneypunct<char, false>::id._M_id()] = __mpcf;
 461     _M_caches[moneypunct<char, true>::id._M_id()] = __mpct;
 462     _M_caches[__timepunct<char>::id._M_id()] = __tpc;
 463 #ifdef  _GLIBCXX_USE_WCHAR_T
 464     _M_caches[numpunct<wchar_t>::id._M_id()] = __npw;
 465     _M_caches[moneypunct<wchar_t, false>::id._M_id()] = __mpwf;
 466     _M_caches[moneypunct<wchar_t, true>::id._M_id()] = __mpwt;
 467     _M_caches[__timepunct<wchar_t>::id._M_id()] = __tpw;
 468 #endif
 469   }
 470
 471 _GLIBCXX_END_NAMESPACE