libstdc++-v3/include/debug/formatter.h

   1 // Debug-mode error formatting implementation -*- C++ -*-
   2
   3 // Copyright (C) 2003
   4 // Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 2, or (at your option)
  10 // any later version.
  11
  12 // This library 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 along
  18 // with this library; see the file COPYING.  If not, write to the Free
  19 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  20 // 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 #ifndef _GLIBCXX_DEBUG_FORMATTER_H
  32 #define _GLIBCXX_DEBUG_FORMATTER_H 1
  33
  34 #include <typeinfo>
  35 #include <debug/debug.h>
  36
  37 namespace __gnu_debug
  38 {
  39   using namespace std;
  40
  41   /** Determine if the two types are the same. */
  42   template<typename _Type1, typename _Type2>
  43     struct __is_same
  44     {
  45       static const bool value = false;
  46     };
  47
  48   template<typename _Type>
  49     struct __is_same<_Type, _Type>
  50     {
  51       static const bool value = true;
  52     };
  53
  54   template<bool> struct __truth { };
  55
  56   class _Safe_sequence_base;
  57
  58   template<typename _Iterator, typename _Sequence>
  59     class _Safe_iterator;
  60
  61   template<typename _Sequence>
  62     class _Safe_sequence;
  63
  64   enum _Debug_msg_id
  65   {
  66     // General checks
  67     __msg_valid_range,
  68     __msg_insert_singular,
  69     __msg_insert_different,
  70     __msg_erase_bad,
  71     __msg_erase_different,
  72     __msg_subscript_oob,
  73     __msg_empty,
  74     __msg_unpartitioned,
  75     __msg_unpartitioned_pred,
  76     __msg_unsorted,
  77     __msg_unsorted_pred,
  78     __msg_not_heap,
  79     __msg_not_heap_pred,
  80     // std::bitset checks
  81     __msg_bad_bitset_write,
  82     __msg_bad_bitset_read,
  83     __msg_bad_bitset_flip,
  84     // std::list checks
  85     __msg_self_splice,
  86     __msg_splice_alloc,
  87     __msg_splice_bad,
  88     __msg_splice_other,
  89     __msg_splice_overlap,
  90     // iterator checks
  91     __msg_init_singular,
  92     __msg_init_copy_singular,
  93     __msg_init_const_singular,
  94     __msg_copy_singular,
  95     __msg_bad_deref,
  96     __msg_bad_inc,
  97     __msg_bad_dec,
  98     __msg_iter_subscript_oob,
  99     __msg_advance_oob,
 100     __msg_retreat_oob,
 101     __msg_iter_compare_bad,
 102     __msg_compare_different,
 103     __msg_iter_order_bad,
 104     __msg_order_different,
 105     __msg_distance_bad,
 106     __msg_distance_different,
 107     // istream_iterator
 108     __msg_deref_istream,
 109     __msg_inc_istream,
 110     // ostream_iterator
 111     __msg_output_ostream,
 112     // istreambuf_iterator
 113     __msg_deref_istreambuf,
 114     __msg_inc_istreambuf
 115   };
 116
 117   class _Error_formatter
 118   {
 119     /// Whether an iterator is constant, mutable, or unknown
 120     enum _Constness
 121     {
 122       __unknown_constness,
 123       __const_iterator,
 124       __mutable_iterator,
 125       __last_constness
 126     };
 127
 128     // The state of the iterator (fine-grained), if we know it.
 129     enum _Iterator_state
 130     {
 131       __unknown_state,
 132       __singular,      // singular, may still be attached to a sequence
 133       __begin,         // dereferenceable, and at the beginning
 134       __middle,        // dereferenceable, not at the beginning
 135       __end,           // past-the-end, may be at beginning if sequence empty
 136       __last_state
 137     };
 138
 139     // Tags denoting the type of parameter for construction
 140     struct _Is_iterator { };
 141     struct _Is_sequence { };
 142
 143     // A parameter that may be referenced by an error message
 144     struct _Parameter
 145     {
 146       enum
 147       {
 148         __unused_param,
 149         __iterator,
 150         __sequence,
 151         __integer,
 152         __string
 153       } _M_kind;
 154
 155       union
 156       {
 157         // When _M_kind == __iterator
 158         struct
 159         {
 160           const char*      _M_name;
 161           const void*      _M_address;
 162           const type_info* _M_type;
 163           _Constness       _M_constness;
 164           _Iterator_state  _M_state;
 165           const void*      _M_sequence;
 166           const type_info* _M_seq_type;
 167         } _M_iterator;
 168
 169         // When _M_kind == __sequence
 170         struct
 171         {
 172           const char*      _M_name;
 173           const void*      _M_address;
 174           const type_info* _M_type;
 175         } _M_sequence;
 176
 177         // When _M_kind == __integer
 178         struct
 179         {
 180           const char* _M_name;
 181           long        _M_value;
 182         } _M_integer;
 183
 184         // When _M_kind == __string
 185         struct
 186         {
 187           const char* _M_name;
 188           const char* _M_value;
 189         } _M_string;
 190       } _M_variant;
 191
 192       _Parameter() : _M_kind(__unused_param) { }
 193
 194       _Parameter(long __value, const char* __name) : _M_kind(__integer)
 195       {
 196         _M_variant._M_integer._M_name = __name;
 197         _M_variant._M_integer._M_value = __value;
 198       }
 199
 200       _Parameter(const char* __value, const char* __name) : _M_kind(__string)
 201       {
 202         _M_variant._M_string._M_name = __name;
 203         _M_variant._M_string._M_value = __value;
 204       }
 205
 206       template<typename _Iterator, typename _Sequence>
 207         _Parameter(const _Safe_iterator<_Iterator, _Sequence>& __it,
 208                    const char* __name, _Is_iterator)
 209         : _M_kind(__iterator)
 210         {
 211           _M_variant._M_iterator._M_name = __name;
 212           _M_variant._M_iterator._M_address = &__it;
 213           _M_variant._M_iterator._M_type = &typeid(__it);
 214           _M_variant._M_iterator._M_constness =
 215             __is_same<_Safe_iterator<_Iterator, _Sequence>,
 216                                  typename _Sequence::iterator>::
 217               value? __mutable_iterator : __const_iterator;
 218           _M_variant._M_iterator._M_sequence = __it._M_get_sequence();
 219           _M_variant._M_iterator._M_seq_type = &typeid(_Sequence);
 220
 221           if (__it._M_singular())
 222             _M_variant._M_iterator._M_state = __singular;
 223           else
 224             {
 225               bool __is_begin = __it._M_is_begin();
 226               bool __is_end = __it._M_is_end();
 227               if (__is_end)
 228                 _M_variant._M_iterator._M_state = __end;
 229               else if (__is_begin)
 230                 _M_variant._M_iterator._M_state = __begin;
 231               else
 232                 _M_variant._M_iterator._M_state = __middle;
 233             }
 234         }
 235
 236       template<typename _Type>
 237         _Parameter(const _Type*& __it, const char* __name, _Is_iterator)
 238         : _M_kind(__iterator)
 239         {
 240           _M_variant._M_iterator._M_name = __name;
 241           _M_variant._M_iterator._M_address = &__it;
 242           _M_variant._M_iterator._M_type = &typeid(__it);
 243           _M_variant._M_iterator._M_constness = __mutable_iterator;
 244           _M_variant._M_iterator._M_state = __it? __unknown_state : __singular;
 245           _M_variant._M_iterator._M_sequence = 0;
 246           _M_variant._M_iterator._M_seq_type = 0;
 247         }
 248
 249       template<typename _Type>
 250         _Parameter(_Type*& __it, const char* __name, _Is_iterator)
 251         : _M_kind(__iterator)
 252         {
 253           _M_variant._M_iterator._M_name = __name;
 254           _M_variant._M_iterator._M_address = &__it;
 255           _M_variant._M_iterator._M_type = &typeid(__it);
 256           _M_variant._M_iterator._M_constness = __const_iterator;
 257           _M_variant._M_iterator._M_state = __it? __unknown_state : __singular;
 258           _M_variant._M_iterator._M_sequence = 0;
 259           _M_variant._M_iterator._M_seq_type = 0;
 260         }
 261
 262       template<typename _Iterator>
 263         _Parameter(const _Iterator& __it, const char* __name, _Is_iterator)
 264         : _M_kind(__iterator)
 265         {
 266           _M_variant._M_iterator._M_name = __name;
 267           _M_variant._M_iterator._M_address = &__it;
 268           _M_variant._M_iterator._M_type = &typeid(__it);
 269           _M_variant._M_iterator._M_constness = __unknown_constness;
 270           _M_variant._M_iterator._M_state =
 271             __gnu_debug::__check_singular(__it)? __singular : __unknown_state;
 272           _M_variant._M_iterator._M_sequence = 0;
 273           _M_variant._M_iterator._M_seq_type = 0;
 274         }
 275
 276       template<typename _Sequence>
 277         _Parameter(const _Safe_sequence<_Sequence>& __seq,
 278                    const char* __name, _Is_sequence)
 279         : _M_kind(__sequence)
 280         {
 281           _M_variant._M_sequence._M_name = __name;
 282           _M_variant._M_sequence._M_address =
 283             static_cast<const _Sequence*>(&__seq);
 284           _M_variant._M_sequence._M_type = &typeid(_Sequence);
 285         }
 286
 287       template<typename _Sequence>
 288         _Parameter(const _Sequence& __seq, const char* __name, _Is_sequence)
 289         : _M_kind(__sequence)
 290         {
 291           _M_variant._M_sequence._M_name = __name;
 292           _M_variant._M_sequence._M_address = &__seq;
 293           _M_variant._M_sequence._M_type = &typeid(_Sequence);
 294         }
 295
 296       void
 297       _M_print_field(const _Error_formatter* __formatter,
 298                      const char* __name) const;
 299
 300       void
 301       _M_print_description(const _Error_formatter* __formatter) const;
 302     };
 303
 304     friend struct _Parameter;
 305
 306   public:
 307     template<typename _Iterator>
 308       const _Error_formatter&
 309       _M_iterator(const _Iterator& __it, const char* __name = 0)  const
 310       {
 311         if (_M_num_parameters < __max_parameters)
 312           _M_parameters[_M_num_parameters++] = _Parameter(__it, __name,
 313                                                           _Is_iterator());
 314         return *this;
 315       }
 316
 317     const _Error_formatter&
 318     _M_integer(long __value, const char* __name = 0) const
 319     {
 320       if (_M_num_parameters < __max_parameters)
 321         _M_parameters[_M_num_parameters++] = _Parameter(__value, __name);
 322       return *this;
 323     }
 324
 325     const _Error_formatter&
 326     _M_string(const char* __value, const char* __name = 0) const
 327     {
 328       if (_M_num_parameters < __max_parameters)
 329         _M_parameters[_M_num_parameters++] = _Parameter(__value, __name);
 330       return *this;
 331     }
 332
 333     template<typename _Sequence>
 334       const _Error_formatter&
 335       _M_sequence(const _Sequence& __seq, const char* __name = 0) const
 336       {
 337         if (_M_num_parameters < __max_parameters)
 338           _M_parameters[_M_num_parameters++] = _Parameter(__seq, __name,
 339                                                           _Is_sequence());
 340         return *this;
 341       }
 342
 343     const _Error_formatter&
 344     _M_message(const char* __text) const
 345     { _M_text = __text; return *this; }
 346
 347     const _Error_formatter&
 348     _M_message(_Debug_msg_id __id) const;
 349
 350     void
 351     _M_error() const;
 352
 353   private:
 354     _Error_formatter(const char* __file, size_t __line)
 355     : _M_file(__file), _M_line(__line), _M_num_parameters(0), _M_text(0),
 356       _M_max_length(78), _M_column(1), _M_first_line(true), _M_wordwrap(false)
 357     { }
 358
 359     template<typename _Tp>
 360       void
 361       _M_format_word(char*, int, const char*, _Tp) const;
 362
 363     void
 364     _M_print_word(const char* __word) const;
 365
 366     void
 367     _M_print_string(const char* __string) const;
 368
 369     enum { __max_parameters = 9 };
 370
 371     const char*         _M_file;
 372     size_t              _M_line;
 373     mutable _Parameter  _M_parameters[__max_parameters];
 374     mutable size_t      _M_num_parameters;
 375     mutable const char* _M_text;
 376     mutable size_t      _M_max_length;
 377     enum { _M_indent = 4 } ;
 378     mutable size_t      _M_column;
 379     mutable bool        _M_first_line;
 380     mutable bool        _M_wordwrap;
 381
 382   public:
 383     static _Error_formatter
 384     _M_at(const char* __file, size_t __line)
 385     { return _Error_formatter(__file, __line); }
 386   };
 387 } // namespace __gnu_debug
 388
 389 #endif