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 namespace std _GLIBCXX_VISIBILITY(default)
 207 {
 208 _GLIBCXX_BEGIN_NAMESPACE_VERSION
 209
 210   locale::locale() throw() : _M_impl(0)
 211   {
 212     _S_initialize();
 213
 214     // Checked locking to optimize the common case where _S_global
 215     // still points to _S_classic (locale::_S_initialize_once()):
 216     // - If they are the same, just increment the reference count and
 217     //   we are done.  This effectively constructs a C locale object
 218     //   identical to the static c_locale.
 219     // - Otherwise, _S_global can and may be destroyed due to
 220     //   locale::global() call on another thread, in which case we
 221     //   fall back to lock protected access to both _S_global and
 222     //   its reference count.
 223     _M_impl = _S_global;
 224     if (_M_impl == _S_classic)
 225       _M_impl->_M_add_reference();
 226     else
 227       {
 228         __gnu_cxx::__scoped_lock sentry(get_locale_mutex());
 229         _S_global->_M_add_reference();
 230         _M_impl = _S_global;
 231       }
 232   }
 233
 234   locale
 235   locale::global(const locale& __other)
 236   {
 237     _S_initialize();
 238     _Impl* __old;
 239     {
 240       __gnu_cxx::__scoped_lock sentry(get_locale_mutex());
 241       __old = _S_global;
 242       __other._M_impl->_M_add_reference();
 243       _S_global = __other._M_impl;
 244       const string __other_name = __other.name();
 245       if (__other_name != "*")
 246         setlocale(LC_ALL, __other_name.c_str());
 247     }
 248
 249     // Reference count sanity check: one reference removed for the
 250     // subsition of __other locale, one added by return-by-value. Net
 251     // difference: zero. When the returned locale object's destrutor
 252     // is called, then the reference count is decremented and possibly
 253     // destroyed.
 254     return locale(__old);
 255   }
 256
 257   const locale&
 258   locale::classic()
 259   {
 260     _S_initialize();
 261     return *(new (&c_locale) locale(_S_classic));
 262   }
 263
 264   void
 265   locale::_S_initialize_once() throw()
 266   {
 267     // 2 references.
 268     // One reference for _S_classic, one for _S_global
 269     _S_classic = new (&c_locale_impl) _Impl(2);
 270     _S_global = _S_classic;
 271   }
 272
 273   void
 274   locale::_S_initialize()
 275   {
 276 #ifdef __GTHREADS
 277     if (__gthread_active_p())
 278       __gthread_once(&_S_once, _S_initialize_once);
 279 #endif
 280     if (!_S_classic)
 281       _S_initialize_once();
 282   }
 283
 284   // Definitions for static const data members of locale::_Impl
 285   const locale::id* const
 286   locale::_Impl::_S_id_ctype[] =
 287   {
 288     &std::ctype<char>::id,
 289     &codecvt<char, char, mbstate_t>::id,
 290 #ifdef _GLIBCXX_USE_WCHAR_T
 291     &std::ctype<wchar_t>::id,
 292     &codecvt<wchar_t, char, mbstate_t>::id,
 293 #endif
 294     0
 295   };
 296
 297   const locale::id* const
 298   locale::_Impl::_S_id_numeric[] =
 299   {
 300     &num_get<char>::id,
 301     &num_put<char>::id,
 302     &numpunct<char>::id,
 303 #ifdef _GLIBCXX_USE_WCHAR_T
 304     &num_get<wchar_t>::id,
 305     &num_put<wchar_t>::id,
 306     &numpunct<wchar_t>::id,
 307 #endif
 308     0
 309   };
 310
 311   const locale::id* const
 312   locale::_Impl::_S_id_collate[] =
 313   {
 314     &std::collate<char>::id,
 315 #ifdef _GLIBCXX_USE_WCHAR_T
 316     &std::collate<wchar_t>::id,
 317 #endif
 318     0
 319   };
 320
 321   const locale::id* const
 322   locale::_Impl::_S_id_time[] =
 323   {
 324     &__timepunct<char>::id,
 325     &time_get<char>::id,
 326     &time_put<char>::id,
 327 #ifdef _GLIBCXX_USE_WCHAR_T
 328     &__timepunct<wchar_t>::id,
 329     &time_get<wchar_t>::id,
 330     &time_put<wchar_t>::id,
 331 #endif
 332     0
 333   };
 334
 335   const locale::id* const
 336   locale::_Impl::_S_id_monetary[] =
 337   {
 338     &money_get<char>::id,
 339     &money_put<char>::id,
 340     &moneypunct<char, false>::id,
 341     &moneypunct<char, true >::id,
 342 #ifdef _GLIBCXX_USE_WCHAR_T
 343     &money_get<wchar_t>::id,
 344     &money_put<wchar_t>::id,
 345     &moneypunct<wchar_t, false>::id,
 346     &moneypunct<wchar_t, true >::id,
 347 #endif
 348     0
 349   };
 350
 351   const locale::id* const
 352   locale::_Impl::_S_id_messages[] =
 353   {
 354     &std::messages<char>::id,
 355 #ifdef _GLIBCXX_USE_WCHAR_T
 356     &std::messages<wchar_t>::id,
 357 #endif
 358     0
 359   };
 360
 361   const locale::id* const* const
 362   locale::_Impl::_S_facet_categories[] =
 363   {
 364     // Order must match the decl order in class locale.
 365     locale::_Impl::_S_id_ctype,
 366     locale::_Impl::_S_id_numeric,
 367     locale::_Impl::_S_id_collate,
 368     locale::_Impl::_S_id_time,
 369     locale::_Impl::_S_id_monetary,
 370     locale::_Impl::_S_id_messages,
 371     0
 372   };
 373
 374   // Construct "C" _Impl.
 375   locale::_Impl::
 376   _Impl(size_t __refs) throw()
 377   : _M_refcount(__refs), _M_facets(0), _M_facets_size(_GLIBCXX_NUM_FACETS),
 378   _M_caches(0), _M_names(0)
 379   {
 380     _M_facets = new (&facet_vec) const facet*[_M_facets_size];
 381     _M_caches = new (&cache_vec) const facet*[_M_facets_size];
 382     for (size_t __i = 0; __i < _M_facets_size; ++__i)
 383       _M_facets[__i] = _M_caches[__i] = 0;
 384
 385     // Name the categories.
 386     _M_names = new (&name_vec) char*[_S_categories_size];
 387     _M_names[0] = new (&name_c[0]) char[2];
 388     std::memcpy(_M_names[0], locale::facet::_S_get_c_name(), 2);
 389     for (size_t __j = 1; __j < _S_categories_size; ++__j)
 390       _M_names[__j] = 0;
 391
 392     // This is needed as presently the C++ version of "C" locales
 393     // != data in the underlying locale model for __timepunct,
 394     // numpunct, and moneypunct. Also, the "C" locales must be
 395     // constructed in a way such that they are pre-allocated.
 396     // NB: Set locale::facets(ref) count to one so that each individual
 397     // facet is not destroyed when the locale (and thus locale::_Impl) is
 398     // destroyed.
 399     _M_init_facet(new (&ctype_c) std::ctype<char>(0, false, 1));
 400     _M_init_facet(new (&codecvt_c) codecvt<char, char, mbstate_t>(1));
 401
 402     typedef __numpunct_cache<char> num_cache_c;
 403     num_cache_c* __npc = new (&numpunct_cache_c) num_cache_c(2);
 404     _M_init_facet(new (&numpunct_c) numpunct<char>(__npc, 1));
 405
 406     _M_init_facet(new (&num_get_c) num_get<char>(1));
 407     _M_init_facet(new (&num_put_c) num_put<char>(1));
 408     _M_init_facet(new (&collate_c) std::collate<char>(1));
 409
 410     typedef __moneypunct_cache<char, false> money_cache_cf;
 411     typedef __moneypunct_cache<char, true> money_cache_ct;
 412     money_cache_cf* __mpcf = new (&moneypunct_cache_cf) money_cache_cf(2);
 413     _M_init_facet(new (&moneypunct_cf) moneypunct<char, false>(__mpcf, 1));
 414     money_cache_ct* __mpct = new (&moneypunct_cache_ct) money_cache_ct(2);
 415     _M_init_facet(new (&moneypunct_ct) moneypunct<char, true>(__mpct, 1));
 416
 417     _M_init_facet(new (&money_get_c) money_get<char>(1));
 418     _M_init_facet(new (&money_put_c) money_put<char>(1));
 419
 420     typedef __timepunct_cache<char> time_cache_c;
 421     time_cache_c* __tpc = new (&timepunct_cache_c) time_cache_c(2);
 422     _M_init_facet(new (&timepunct_c) __timepunct<char>(__tpc, 1));
 423
 424     _M_init_facet(new (&time_get_c) time_get<char>(1));
 425     _M_init_facet(new (&time_put_c) time_put<char>(1));
 426     _M_init_facet(new (&messages_c) std::messages<char>(1));
 427
 428 #ifdef  _GLIBCXX_USE_WCHAR_T
 429     _M_init_facet(new (&ctype_w) std::ctype<wchar_t>(1));
 430     _M_init_facet(new (&codecvt_w) codecvt<wchar_t, char, mbstate_t>(1));
 431
 432     typedef __numpunct_cache<wchar_t> num_cache_w;
 433     num_cache_w* __npw = new (&numpunct_cache_w) num_cache_w(2);
 434     _M_init_facet(new (&numpunct_w) numpunct<wchar_t>(__npw, 1));
 435
 436     _M_init_facet(new (&num_get_w) num_get<wchar_t>(1));
 437     _M_init_facet(new (&num_put_w) num_put<wchar_t>(1));
 438     _M_init_facet(new (&collate_w) std::collate<wchar_t>(1));
 439
 440     typedef __moneypunct_cache<wchar_t, false> money_cache_wf;
 441     typedef __moneypunct_cache<wchar_t, true> money_cache_wt;
 442     money_cache_wf* __mpwf = new (&moneypunct_cache_wf) money_cache_wf(2);
 443     _M_init_facet(new (&moneypunct_wf) moneypunct<wchar_t, false>(__mpwf, 1));
 444     money_cache_wt* __mpwt = new (&moneypunct_cache_wt) money_cache_wt(2);
 445     _M_init_facet(new (&moneypunct_wt) moneypunct<wchar_t, true>(__mpwt, 1));
 446
 447     _M_init_facet(new (&money_get_w) money_get<wchar_t>(1));
 448     _M_init_facet(new (&money_put_w) money_put<wchar_t>(1));
 449
 450     typedef __timepunct_cache<wchar_t> time_cache_w;
 451     time_cache_w* __tpw = new (&timepunct_cache_w) time_cache_w(2);
 452     _M_init_facet(new (&timepunct_w) __timepunct<wchar_t>(__tpw, 1));
 453
 454     _M_init_facet(new (&time_get_w) time_get<wchar_t>(1));
 455     _M_init_facet(new (&time_put_w) time_put<wchar_t>(1));
 456     _M_init_facet(new (&messages_w) std::messages<wchar_t>(1));
 457 #endif
 458
 459     // This locale is safe to pre-cache, after all the facets have
 460     // been created and installed.
 461     _M_caches[numpunct<char>::id._M_id()] = __npc;
 462     _M_caches[moneypunct<char, false>::id._M_id()] = __mpcf;
 463     _M_caches[moneypunct<char, true>::id._M_id()] = __mpct;
 464     _M_caches[__timepunct<char>::id._M_id()] = __tpc;
 465 #ifdef  _GLIBCXX_USE_WCHAR_T
 466     _M_caches[numpunct<wchar_t>::id._M_id()] = __npw;
 467     _M_caches[moneypunct<wchar_t, false>::id._M_id()] = __mpwf;
 468     _M_caches[moneypunct<wchar_t, true>::id._M_id()] = __mpwt;
 469     _M_caches[__timepunct<wchar_t>::id._M_id()] = __tpw;
 470 #endif
 471   }
 472
 473 _GLIBCXX_END_NAMESPACE_VERSION
 474 } // namespace