libstdc++-v3/src/locale_init.cc

   1 // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
   2 // Free Software Foundation, Inc.
   3 //
   4 // This file is part of the GNU ISO C++ Library.  This library is free
   5 // software; you can redistribute it and/or modify it under the
   6 // terms of the GNU General Public License as published by the
   7 // Free Software Foundation; either version 2, or (at your option)
   8 // any later version.
   9
  10 // This library is distributed in the hope that it will be useful,
  11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 // GNU General Public License for more details.
  14
  15 // You should have received a copy of the GNU General Public License along
  16 // with this library; see the file COPYING.  If not, write to the Free
  17 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  18 // USA.
  19
  20 // As a special exception, you may use this file as part of a free software
  21 // library without restriction.  Specifically, if other files instantiate
  22 // templates or use macros or inline functions from this file, or you compile
  23 // this file and link it with other files to produce an executable, this
  24 // file does not by itself cause the resulting executable to be covered by
  25 // the GNU General Public License.  This exception does not however
  26 // invalidate any other reasons why the executable file might be covered by
  27 // the GNU General Public License.
  28
  29 #include <clocale>
  30 #include <cstring>
  31 #include <cstdlib>     // For getenv, free.
  32 #include <cctype>
  33 #include <cwctype>     // For towupper, etc.
  34 #include <locale>
  35 #include <ext/concurrence.h>
  36
  37 namespace
  38 {
  39   __gnu_cxx::__mutex&
  40   get_locale_mutex()
  41   {
  42     static __gnu_cxx::__mutex locale_mutex;
  43     return locale_mutex;
  44   }
  45
  46   using namespace std;
  47
  48   typedef char fake_locale_Impl[sizeof(locale::_Impl)]
  49   __attribute__ ((aligned(__alignof__(locale::_Impl))));
  50   fake_locale_Impl c_locale_impl;
  51
  52   typedef char fake_locale[sizeof(locale)]
  53   __attribute__ ((aligned(__alignof__(locale))));
  54   fake_locale c_locale;
  55
  56   typedef char fake_name_vec[sizeof(char*)]
  57   __attribute__ ((aligned(__alignof__(char*))));
  58   fake_name_vec name_vec[6 + _GLIBCXX_NUM_CATEGORIES];
  59
  60   typedef char fake_names[sizeof(char[2])]
  61   __attribute__ ((aligned(__alignof__(char[2]))));
  62   fake_names name_c[6 + _GLIBCXX_NUM_CATEGORIES];
  63
  64   typedef char fake_facet_vec[sizeof(locale::facet*)]
  65   __attribute__ ((aligned(__alignof__(locale::facet*))));
  66   fake_facet_vec facet_vec[_GLIBCXX_NUM_FACETS];
  67
  68   typedef char fake_cache_vec[sizeof(locale::facet*)]
  69   __attribute__ ((aligned(__alignof__(locale::facet*))));
  70   fake_cache_vec cache_vec[_GLIBCXX_NUM_FACETS];
  71
  72   typedef char fake_ctype_c[sizeof(std::ctype<char>)]
  73   __attribute__ ((aligned(__alignof__(std::ctype<char>))));
  74   fake_ctype_c ctype_c;
  75
  76   typedef char fake_collate_c[sizeof(std::collate<char>)]
  77   __attribute__ ((aligned(__alignof__(std::collate<char>))));
  78   fake_collate_c collate_c;
  79
  80   typedef char fake_numpunct_c[sizeof(numpunct<char>)]
  81   __attribute__ ((aligned(__alignof__(numpunct<char>))));
  82   fake_numpunct_c numpunct_c;
  83
  84   typedef char fake_num_get_c[sizeof(num_get<char>)]
  85   __attribute__ ((aligned(__alignof__(num_get<char>))));
  86   fake_num_get_c num_get_c;
  87
  88   typedef char fake_num_put_c[sizeof(num_put<char>)]
  89   __attribute__ ((aligned(__alignof__(num_put<char>))));
  90   fake_num_put_c num_put_c;
  91
  92   typedef char fake_codecvt_c[sizeof(codecvt<char, char, mbstate_t>)]
  93   __attribute__ ((aligned(__alignof__(codecvt<char, char, mbstate_t>))));
  94   fake_codecvt_c codecvt_c;
  95
  96   typedef char fake_moneypunct_c[sizeof(moneypunct<char, true>)]
  97   __attribute__ ((aligned(__alignof__(moneypunct<char, true>))));
  98   fake_moneypunct_c moneypunct_ct;
  99   fake_moneypunct_c moneypunct_cf;
 100
 101   typedef char fake_money_get_c[sizeof(money_get<char>)]
 102   __attribute__ ((aligned(__alignof__(money_get<char>))));
 103   fake_money_get_c money_get_c;
 104
 105   typedef char fake_money_put_c[sizeof(money_put<char>)]
 106   __attribute__ ((aligned(__alignof__(money_put<char>))));
 107   fake_money_put_c money_put_c;
 108
 109   typedef char fake_timepunct_c[sizeof(__timepunct<char>)]
 110   __attribute__ ((aligned(__alignof__(__timepunct<char>))));
 111   fake_timepunct_c timepunct_c;
 112
 113   typedef char fake_time_get_c[sizeof(time_get<char>)]
 114   __attribute__ ((aligned(__alignof__(time_get<char>))));
 115   fake_time_get_c time_get_c;
 116
 117   typedef char fake_time_put_c[sizeof(time_put<char>)]
 118   __attribute__ ((aligned(__alignof__(time_put<char>))));
 119   fake_time_put_c time_put_c;
 120
 121   typedef char fake_messages_c[sizeof(messages<char>)]
 122   __attribute__ ((aligned(__alignof__(messages<char>))));
 123   fake_messages_c messages_c;
 124
 125 #ifdef  _GLIBCXX_USE_WCHAR_T
 126   typedef char fake_wtype_w[sizeof(std::ctype<wchar_t>)]
 127   __attribute__ ((aligned(__alignof__(std::ctype<wchar_t>))));
 128   fake_wtype_w ctype_w;
 129
 130   typedef char fake_wollate_w[sizeof(std::collate<wchar_t>)]
 131   __attribute__ ((aligned(__alignof__(std::collate<wchar_t>))));
 132   fake_wollate_w collate_w;
 133
 134   typedef char fake_numpunct_w[sizeof(numpunct<wchar_t>)]
 135   __attribute__ ((aligned(__alignof__(numpunct<wchar_t>))));
 136   fake_numpunct_w numpunct_w;
 137
 138   typedef char fake_num_get_w[sizeof(num_get<wchar_t>)]
 139   __attribute__ ((aligned(__alignof__(num_get<wchar_t>))));
 140   fake_num_get_w num_get_w;
 141
 142   typedef char fake_num_put_w[sizeof(num_put<wchar_t>)]
 143   __attribute__ ((aligned(__alignof__(num_put<wchar_t>))));
 144   fake_num_put_w num_put_w;
 145
 146   typedef char fake_wodecvt_w[sizeof(codecvt<wchar_t, char, mbstate_t>)]
 147   __attribute__ ((aligned(__alignof__(codecvt<wchar_t, char, mbstate_t>))));
 148   fake_wodecvt_w codecvt_w;
 149
 150   typedef char fake_moneypunct_w[sizeof(moneypunct<wchar_t, true>)]
 151   __attribute__ ((aligned(__alignof__(moneypunct<wchar_t, true>))));
 152   fake_moneypunct_w moneypunct_wt;
 153   fake_moneypunct_w moneypunct_wf;
 154
 155   typedef char fake_money_get_w[sizeof(money_get<wchar_t>)]
 156   __attribute__ ((aligned(__alignof__(money_get<wchar_t>))));
 157   fake_money_get_w money_get_w;
 158
 159   typedef char fake_money_put_w[sizeof(money_put<wchar_t>)]
 160   __attribute__ ((aligned(__alignof__(money_put<wchar_t>))));
 161   fake_money_put_w money_put_w;
 162
 163   typedef char fake_timepunct_w[sizeof(__timepunct<wchar_t>)]
 164   __attribute__ ((aligned(__alignof__(__timepunct<wchar_t>))));
 165   fake_timepunct_w timepunct_w;
 166
 167   typedef char fake_time_get_w[sizeof(time_get<wchar_t>)]
 168   __attribute__ ((aligned(__alignof__(time_get<wchar_t>))));
 169   fake_time_get_w time_get_w;
 170
 171   typedef char fake_time_put_w[sizeof(time_put<wchar_t>)]
 172   __attribute__ ((aligned(__alignof__(time_put<wchar_t>))));
 173   fake_time_put_w time_put_w;
 174
 175   typedef char fake_messages_w[sizeof(messages<wchar_t>)]
 176   __attribute__ ((aligned(__alignof__(messages<wchar_t>))));
 177   fake_messages_w messages_w;
 178 #endif
 179
 180   // Storage for "C" locale caches.
 181   typedef char fake_num_cache_c[sizeof(std::__numpunct_cache<char>)]
 182   __attribute__ ((aligned(__alignof__(std::__numpunct_cache<char>))));
 183   fake_num_cache_c numpunct_cache_c;
 184
 185   typedef char fake_money_cache_c[sizeof(std::__moneypunct_cache<char, true>)]
 186   __attribute__ ((aligned(__alignof__(std::__moneypunct_cache<char, true>))));
 187   fake_money_cache_c moneypunct_cache_ct;
 188   fake_money_cache_c moneypunct_cache_cf;
 189
 190   typedef char fake_time_cache_c[sizeof(std::__timepunct_cache<char>)]
 191   __attribute__ ((aligned(__alignof__(std::__timepunct_cache<char>))));
 192   fake_time_cache_c timepunct_cache_c;
 193
 194 #ifdef _GLIBCXX_USE_WCHAR_T
 195   typedef char fake_num_cache_w[sizeof(std::__numpunct_cache<wchar_t>)]
 196   __attribute__ ((aligned(__alignof__(std::__numpunct_cache<wchar_t>))));
 197   fake_num_cache_w numpunct_cache_w;
 198
 199   typedef char fake_money_cache_w[sizeof(std::__moneypunct_cache<wchar_t,true>)]
 200   __attribute__ ((aligned(__alignof__(std::__moneypunct_cache<wchar_t,true>))));
 201   fake_money_cache_w moneypunct_cache_wt;
 202   fake_money_cache_w moneypunct_cache_wf;
 203
 204   typedef char fake_time_cache_w[sizeof(std::__timepunct_cache<wchar_t>)]
 205   __attribute__ ((aligned(__alignof__(std::__timepunct_cache<wchar_t>))));
 206   fake_time_cache_w timepunct_cache_w;
 207 #endif
 208 } // anonymous namespace
 209
 210 _GLIBCXX_BEGIN_NAMESPACE(std)
 211
 212   locale::locale() throw() : _M_impl(0)
 213   {
 214     _S_initialize();
 215     __gnu_cxx::__scoped_lock sentry(get_locale_mutex());
 216     _S_global->_M_add_reference();
 217     _M_impl = _S_global;
 218   }
 219
 220   locale
 221   locale::global(const locale& __other)
 222   {
 223     _S_initialize();
 224     _Impl* __old;
 225     {
 226       __gnu_cxx::__scoped_lock sentry(get_locale_mutex());
 227       __old = _S_global;
 228       __other._M_impl->_M_add_reference();
 229       _S_global = __other._M_impl;
 230       const string __other_name = __other.name();
 231       if (__other_name != "*")
 232         setlocale(LC_ALL, __other_name.c_str());
 233     }
 234
 235     // Reference count sanity check: one reference removed for the
 236     // subsition of __other locale, one added by return-by-value. Net
 237     // difference: zero. When the returned locale object's destrutor
 238     // is called, then the reference count is decremented and possibly
 239     // destroyed.
 240     return locale(__old);
 241   }
 242
 243   const locale&
 244   locale::classic()
 245   {
 246     _S_initialize();
 247     return reinterpret_cast<const locale&>(c_locale);
 248   }
 249
 250   void
 251   locale::_S_initialize_once()
 252   {
 253     // 2 references.
 254     // One reference for _S_classic, one for _S_global
 255     _S_classic = new (&c_locale_impl) _Impl(2);
 256     _S_global = _S_classic;
 257     new (&c_locale) locale(_S_classic);
 258   }
 259
 260   void
 261   locale::_S_initialize()
 262   {
 263 #ifdef __GTHREADS
 264     if (__gthread_active_p())
 265       __gthread_once(&_S_once, _S_initialize_once);
 266 #endif
 267     if (!_S_classic)
 268       _S_initialize_once();
 269   }
 270
 271   // Definitions for static const data members of locale::_Impl
 272   const locale::id* const
 273   locale::_Impl::_S_id_ctype[] =
 274   {
 275     &std::ctype<char>::id,
 276     &codecvt<char, char, mbstate_t>::id,
 277 #ifdef _GLIBCXX_USE_WCHAR_T
 278     &std::ctype<wchar_t>::id,
 279     &codecvt<wchar_t, char, mbstate_t>::id,
 280 #endif
 281     0
 282   };
 283
 284   const locale::id* const
 285   locale::_Impl::_S_id_numeric[] =
 286   {
 287     &num_get<char>::id,
 288     &num_put<char>::id,
 289     &numpunct<char>::id,
 290 #ifdef _GLIBCXX_USE_WCHAR_T
 291     &num_get<wchar_t>::id,
 292     &num_put<wchar_t>::id,
 293     &numpunct<wchar_t>::id,
 294 #endif
 295     0
 296   };
 297
 298   const locale::id* const
 299   locale::_Impl::_S_id_collate[] =
 300   {
 301     &std::collate<char>::id,
 302 #ifdef _GLIBCXX_USE_WCHAR_T
 303     &std::collate<wchar_t>::id,
 304 #endif
 305     0
 306   };
 307
 308   const locale::id* const
 309   locale::_Impl::_S_id_time[] =
 310   {
 311     &__timepunct<char>::id,
 312     &time_get<char>::id,
 313     &time_put<char>::id,
 314 #ifdef _GLIBCXX_USE_WCHAR_T
 315     &__timepunct<wchar_t>::id,
 316     &time_get<wchar_t>::id,
 317     &time_put<wchar_t>::id,
 318 #endif
 319     0
 320   };
 321
 322   const locale::id* const
 323   locale::_Impl::_S_id_monetary[] =
 324   {
 325     &money_get<char>::id,
 326     &money_put<char>::id,
 327     &moneypunct<char, false>::id,
 328     &moneypunct<char, true >::id,
 329 #ifdef _GLIBCXX_USE_WCHAR_T
 330     &money_get<wchar_t>::id,
 331     &money_put<wchar_t>::id,
 332     &moneypunct<wchar_t, false>::id,
 333     &moneypunct<wchar_t, true >::id,
 334 #endif
 335     0
 336   };
 337
 338   const locale::id* const
 339   locale::_Impl::_S_id_messages[] =
 340   {
 341     &std::messages<char>::id,
 342 #ifdef _GLIBCXX_USE_WCHAR_T
 343     &std::messages<wchar_t>::id,
 344 #endif
 345     0
 346   };
 347
 348   const locale::id* const* const
 349   locale::_Impl::_S_facet_categories[] =
 350   {
 351     // Order must match the decl order in class locale.
 352     locale::_Impl::_S_id_ctype,
 353     locale::_Impl::_S_id_numeric,
 354     locale::_Impl::_S_id_collate,
 355     locale::_Impl::_S_id_time,
 356     locale::_Impl::_S_id_monetary,
 357     locale::_Impl::_S_id_messages,
 358     0
 359   };
 360
 361   // Construct "C" _Impl.
 362   locale::_Impl::
 363   _Impl(size_t __refs) throw()
 364   : _M_refcount(__refs), _M_facets(0), _M_facets_size(_GLIBCXX_NUM_FACETS),
 365   _M_caches(0), _M_names(0)
 366   {
 367     _M_facets = new (&facet_vec) const facet*[_M_facets_size];
 368     _M_caches = new (&cache_vec) const facet*[_M_facets_size];
 369     for (size_t __i = 0; __i < _M_facets_size; ++__i)
 370       _M_facets[__i] = _M_caches[__i] = 0;
 371
 372     // Name the categories.
 373     _M_names = new (&name_vec) char*[_S_categories_size];
 374     _M_names[0] = new (&name_c[0]) char[2];
 375     std::memcpy(_M_names[0], locale::facet::_S_get_c_name(), 2);
 376     for (size_t __j = 1; __j < _S_categories_size; ++__j)
 377       _M_names[__j] = 0;
 378
 379     // This is needed as presently the C++ version of "C" locales
 380     // != data in the underlying locale model for __timepunct,
 381     // numpunct, and moneypunct. Also, the "C" locales must be
 382     // constructed in a way such that they are pre-allocated.
 383     // NB: Set locale::facets(ref) count to one so that each individual
 384     // facet is not destroyed when the locale (and thus locale::_Impl) is
 385     // destroyed.
 386     _M_init_facet(new (&ctype_c) std::ctype<char>(0, false, 1));
 387     _M_init_facet(new (&codecvt_c) codecvt<char, char, mbstate_t>(1));
 388
 389     typedef __numpunct_cache<char> num_cache_c;
 390     num_cache_c* __npc = new (&numpunct_cache_c) num_cache_c(2);
 391     _M_init_facet(new (&numpunct_c) numpunct<char>(__npc, 1));
 392
 393     _M_init_facet(new (&num_get_c) num_get<char>(1));
 394     _M_init_facet(new (&num_put_c) num_put<char>(1));
 395     _M_init_facet(new (&collate_c) std::collate<char>(1));
 396
 397     typedef __moneypunct_cache<char, false> money_cache_cf;
 398     typedef __moneypunct_cache<char, true> money_cache_ct;
 399     money_cache_cf* __mpcf = new (&moneypunct_cache_cf) money_cache_cf(2);
 400     _M_init_facet(new (&moneypunct_cf) moneypunct<char, false>(__mpcf, 1));
 401     money_cache_ct* __mpct = new (&moneypunct_cache_ct) money_cache_ct(2);
 402     _M_init_facet(new (&moneypunct_ct) moneypunct<char, true>(__mpct, 1));
 403
 404     _M_init_facet(new (&money_get_c) money_get<char>(1));
 405     _M_init_facet(new (&money_put_c) money_put<char>(1));
 406
 407     typedef __timepunct_cache<char> time_cache_c;
 408     time_cache_c* __tpc = new (&timepunct_cache_c) time_cache_c(2);
 409     _M_init_facet(new (&timepunct_c) __timepunct<char>(__tpc, 1));
 410
 411     _M_init_facet(new (&time_get_c) time_get<char>(1));
 412     _M_init_facet(new (&time_put_c) time_put<char>(1));
 413     _M_init_facet(new (&messages_c) std::messages<char>(1));
 414
 415 #ifdef  _GLIBCXX_USE_WCHAR_T
 416     _M_init_facet(new (&ctype_w) std::ctype<wchar_t>(1));
 417     _M_init_facet(new (&codecvt_w) codecvt<wchar_t, char, mbstate_t>(1));
 418
 419     typedef __numpunct_cache<wchar_t> num_cache_w;
 420     num_cache_w* __npw = new (&numpunct_cache_w) num_cache_w(2);
 421     _M_init_facet(new (&numpunct_w) numpunct<wchar_t>(__npw, 1));
 422
 423     _M_init_facet(new (&num_get_w) num_get<wchar_t>(1));
 424     _M_init_facet(new (&num_put_w) num_put<wchar_t>(1));
 425     _M_init_facet(new (&collate_w) std::collate<wchar_t>(1));
 426
 427     typedef __moneypunct_cache<wchar_t, false> money_cache_wf;
 428     typedef __moneypunct_cache<wchar_t, true> money_cache_wt;
 429     money_cache_wf* __mpwf = new (&moneypunct_cache_wf) money_cache_wf(2);
 430     _M_init_facet(new (&moneypunct_wf) moneypunct<wchar_t, false>(__mpwf, 1));
 431     money_cache_wt* __mpwt = new (&moneypunct_cache_wt) money_cache_wt(2);
 432     _M_init_facet(new (&moneypunct_wt) moneypunct<wchar_t, true>(__mpwt, 1));
 433
 434     _M_init_facet(new (&money_get_w) money_get<wchar_t>(1));
 435     _M_init_facet(new (&money_put_w) money_put<wchar_t>(1));
 436
 437     typedef __timepunct_cache<wchar_t> time_cache_w;
 438     time_cache_w* __tpw = new (&timepunct_cache_w) time_cache_w(2);
 439     _M_init_facet(new (&timepunct_w) __timepunct<wchar_t>(__tpw, 1));
 440
 441     _M_init_facet(new (&time_get_w) time_get<wchar_t>(1));
 442     _M_init_facet(new (&time_put_w) time_put<wchar_t>(1));
 443     _M_init_facet(new (&messages_w) std::messages<wchar_t>(1));
 444 #endif
 445
 446     // This locale is safe to pre-cache, after all the facets have
 447     // been created and installed.
 448     _M_caches[numpunct<char>::id._M_id()] = __npc;
 449     _M_caches[moneypunct<char, false>::id._M_id()] = __mpcf;
 450     _M_caches[moneypunct<char, true>::id._M_id()] = __mpct;
 451     _M_caches[__timepunct<char>::id._M_id()] = __tpc;
 452 #ifdef  _GLIBCXX_USE_WCHAR_T
 453     _M_caches[numpunct<wchar_t>::id._M_id()] = __npw;
 454     _M_caches[moneypunct<wchar_t, false>::id._M_id()] = __mpwf;
 455     _M_caches[moneypunct<wchar_t, true>::id._M_id()] = __mpwt;
 456     _M_caches[__timepunct<wchar_t>::id._M_id()] = __tpw;
 457 #endif
 458   }
 459
 460 _GLIBCXX_END_NAMESPACE