summaryrefslogtreecommitdiffstats
path: root/gnuwin32/bin/data/c++.m4
blob: be12c0a2feb75814f2917c87f1012f0724349d42 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
                                                            -*- Autoconf -*-

# C++ skeleton for Bison

# Copyright (C) 2002-2013 Free Software Foundation, Inc.

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

m4_include(b4_pkgdatadir/[c.m4])

# b4_comment(TEXT, [PREFIX])
# --------------------------
# Put TEXT in comment. Prefix all the output lines with PREFIX.
m4_define([b4_comment],
[b4_comment_([$1], [$2// ], [$2// ])])

## -------- ##
## Checks.  ##
## -------- ##

b4_percent_define_check_kind([api.namespace], [code], [deprecated])
b4_percent_define_check_kind([parser_class_name], [code], [deprecated])

## ---------------- ##
## Default values.  ##
## ---------------- ##

b4_percent_define_default([[parser_class_name]], [[parser]])

# Don't do that so that we remember whether we're using a user
# request, or the default value.
#
# b4_percent_define_default([[api.location.type]], [[location]])

b4_percent_define_default([[filename_type]], [[std::string]])
# Make it a warning for those who used betas of Bison 3.0.
b4_percent_define_default([[api.namespace]], m4_defn([b4_prefix]))

b4_percent_define_default([[global_tokens_and_yystype]], [[false]])
b4_percent_define_default([[define_location_comparison]],
                          [m4_if(b4_percent_define_get([[filename_type]]),
                                 [std::string], [[true]], [[false]])])



## ----------- ##
## Namespace.  ##
## ----------- ##

m4_define([b4_namespace_ref], [b4_percent_define_get([[api.namespace]])])


# Don't permit an empty b4_namespace_ref.  Any '::parser::foo' appended to it
# would compile as an absolute reference with 'parser' in the global namespace.
# b4_namespace_open would open an anonymous namespace and thus establish
# internal linkage.  This would compile.  However, it's cryptic, and internal
# linkage for the parser would be specified in all translation units that
# include the header, which is always generated.  If we ever need to permit
# internal linkage somehow, surely we can find a cleaner approach.
m4_if(m4_bregexp(b4_namespace_ref, [^[	 ]*$]), [-1], [],
[b4_complain_at(b4_percent_define_get_loc([[api.namespace]]),
                [[namespace reference is empty]])])

# Instead of assuming the C++ compiler will do it, Bison should reject any
# invalid b4_namepsace_ref that would be converted to a valid
# b4_namespace_open.  The problem is that Bison doesn't always output
# b4_namespace_ref to uncommented code but should reserve the ability to do so
# in future releases without risking breaking any existing user grammars.
# Specifically, don't allow empty names as b4_namespace_open would just convert
# those into anonymous namespaces, and that might tempt some users.
m4_if(m4_bregexp(b4_namespace_ref, [::[	 ]*::]), [-1], [],
[b4_complain_at(b4_percent_define_get_loc([[api.namespace]]),
                [[namespace reference has consecutive "::"]])])
m4_if(m4_bregexp(b4_namespace_ref, [::[	 ]*$]), [-1], [],
[b4_complain_at(b4_percent_define_get_loc([[api.namespace]]),
                [[namespace reference has a trailing "::"]])])

m4_define([b4_namespace_open],
[b4_user_code([b4_percent_define_get_syncline([[api.namespace]])
[namespace ]m4_bpatsubst(m4_dquote(m4_bpatsubst(m4_dquote(b4_namespace_ref),
                                                [^\(.\)[	 ]*::], [\1])),
                         [::], [ { namespace ])[ {]])])

m4_define([b4_namespace_close],
[b4_user_code([b4_percent_define_get_syncline([[api.namespace]])
m4_bpatsubst(m4_dquote(m4_bpatsubst(m4_dquote(b4_namespace_ref[ ]),
                                    [^\(.\)[	 ]*\(::\)?\([^][:]\|:[^:]\)*],
                                    [\1])),
             [::\([^][:]\|:[^:]\)*], [} ])[} // ]b4_namespace_ref])])


# b4_token_enums
# --------------
# Output the definition of the tokens as enums.
m4_define([b4_token_enums],
[[enum yytokentype
      {
        ]m4_join([,
        ],
                 b4_symbol_map([b4_token_enum]))[
      };]dnl
])




## ----------------- ##
## Semantic Values.  ##
## ----------------- ##



# b4_value_type_declare
# ---------------------
# Declare semantic_type.
m4_define([b4_value_type_declare],
[b4_value_type_setup[]dnl
[    /// Symbol semantic values.
]m4_bmatch(b4_percent_define_get_kind([[api.value.type]]),
[code],
[[    typedef ]b4_percent_define_get([[api.value.type]])[ semantic_type;]],
[m4_bmatch(b4_percent_define_get([[api.value.type]]),
[union\|union-directive],
[[    union semantic_type
    {
    ]b4_user_union_members[
    };]])])dnl
])


# b4_public_types_declare
# -----------------------
# Define the public types: token, semantic value, location, and so forth.
# Depending on %define token_lex, may be output in the header or source file.
m4_define([b4_public_types_declare],
[[#ifndef ]b4_api_PREFIX[STYPE
]b4_value_type_declare[
#else
    typedef ]b4_api_PREFIX[STYPE semantic_type;
#endif]b4_locations_if([
    /// Symbol locations.
    typedef b4_percent_define_get([[api.location.type]],
                                  [[location]]) location_type;])[

    /// Syntax errors thrown from user actions.
    struct syntax_error : std::runtime_error
    {
      syntax_error (]b4_locations_if([const location_type& l, ])[const std::string& m);]b4_locations_if([
      location_type location;])[
    };

    /// Tokens.
    struct token
    {
      ]b4_token_enums[
    };

    /// (External) token type, as returned by yylex.
    typedef token::yytokentype token_type;

    /// Internal symbol number.
    typedef int symbol_number_type;

    /// Internal symbol number for tokens (subsumed by symbol_number_type).
    typedef ]b4_int_type_for([b4_translate])[ token_number_type;

    /// A complete symbol.
    ///
    /// Expects its Base type to provide access to the symbol type
    /// via type_get().
    ///
    /// Provide access to semantic value]b4_locations_if([ and location])[.
    template <typename Base>
    struct basic_symbol : Base
    {
      /// Alias to Base.
      typedef Base super_type;

      /// Default constructor.
      basic_symbol ();

      /// Copy constructor.
      basic_symbol (const basic_symbol& other);
]b4_variant_if([[
      /// Constructor for valueless symbols, and symbols from each type.
]b4_type_foreach([b4_basic_symbol_constructor_declare])], [[
      /// Constructor for valueless symbols.
      basic_symbol (typename Base::kind_type t]b4_locations_if([,
                    const location_type& l])[);]])[

      /// Constructor for symbols with semantic value.
      basic_symbol (typename Base::kind_type t,
                    const semantic_type& v]b4_locations_if([,
                    const location_type& l])[);

      ~basic_symbol ();

      /// Destructive move, \a s is emptied into this.
      void move (basic_symbol& s);

      /// The semantic value.
      semantic_type value;]b4_locations_if([

      /// The location.
      location_type location;])[

    private:
      /// Assignment operator.
      basic_symbol& operator= (const basic_symbol& other);
    };

    /// Type access provider for token (enum) based symbols.
    struct by_type
    {
      /// Default constructor.
      by_type ();

      /// Copy constructor.
      by_type (const by_type& other);

      /// The symbol type as needed by the constructor.
      typedef token_type kind_type;

      /// Constructor from (external) token numbers.
      by_type (kind_type t);

      /// Steal the symbol type from \a that.
      void move (by_type& that);

      /// The (internal) type number (corresponding to \a type).
      /// -1 when this symbol is empty.
      symbol_number_type type_get () const;

      /// The token.
      token_type token () const;

      enum { empty = 0 };

      /// The symbol type.
      /// -1 when this symbol is empty.
      token_number_type type;
    };

    /// "External" symbols: returned by the scanner.
    typedef basic_symbol<by_type> symbol_type;

]b4_symbol_constructor_declare])


# b4_public_types_define
# ----------------------
# Provide the implementation needed by the public types.
m4_define([b4_public_types_define],
[[  inline
  ]b4_parser_class_name[::syntax_error::syntax_error (]b4_locations_if([const location_type& l, ])[const std::string& m)
    : std::runtime_error (m)]b4_locations_if([
    , location (l)])[
  {}

  // basic_symbol.
  template <typename Base>
  inline
  ]b4_parser_class_name[::basic_symbol<Base>::basic_symbol ()
    : value ()
  {}

  template <typename Base>
  inline
  ]b4_parser_class_name[::basic_symbol<Base>::basic_symbol (const basic_symbol& other)
    : Base (other)
    , value ()]b4_locations_if([
    , location (other.location)])[
  {
    ]b4_variant_if([b4_symbol_variant([other.type_get ()], [value], [copy],
                                      [other.value])],
                   [value = other.value;])[
  }


  template <typename Base>
  inline
  ]b4_parser_class_name[::basic_symbol<Base>::basic_symbol (]b4_join(
          [typename Base::kind_type t],
          [const semantic_type& v],
          b4_locations_if([const location_type& l]))[)
    : Base (t)
    , value (]b4_variant_if([], [v])[)]b4_locations_if([
    , location (l)])[
  {]b4_variant_if([[
    (void) v;
    ]b4_symbol_variant([this->type_get ()], [value], [copy], [v])])[}

]b4_variant_if([[
  // Implementation of basic_symbol constructor for each type.
]b4_type_foreach([b4_basic_symbol_constructor_define])], [[
  /// Constructor for valueless symbols.
  template <typename Base>
  inline
  ]b4_parser_class_name[::basic_symbol<Base>::basic_symbol (]b4_join(
          [typename Base::kind_type t],
          b4_locations_if([const location_type& l]))[)
    : Base (t)
    , value ()]b4_locations_if([
    , location (l)])[
  {}]])[

  template <typename Base>
  inline
  ]b4_parser_class_name[::basic_symbol<Base>::~basic_symbol ()
  {]b4_variant_if([[
    // User destructor.
    symbol_number_type yytype = this->type_get ();
    switch (yytype)
    {
]b4_symbol_foreach([b4_symbol_destructor])dnl
[   default:
      break;
    }

    // Type destructor.
  ]b4_symbol_variant([[yytype]], [[value]], [[template destroy]])])[
  }

  template <typename Base>
  inline
  void
  ]b4_parser_class_name[::basic_symbol<Base>::move (basic_symbol& s)
  {
    super_type::move(s);
    ]b4_variant_if([b4_symbol_variant([this->type_get ()], [value], [move],
                                      [s.value])],
                   [value = s.value;])[]b4_locations_if([
    location = s.location;])[
  }

  // by_type.
  inline
  ]b4_parser_class_name[::by_type::by_type ()
     : type (empty)
  {}

  inline
  ]b4_parser_class_name[::by_type::by_type (const by_type& other)
    : type (other.type)
  {}

  inline
  ]b4_parser_class_name[::by_type::by_type (token_type t)
    : type (yytranslate_ (t))
  {}

  inline
  void
  ]b4_parser_class_name[::by_type::move (by_type& that)
  {
    type = that.type;
    that.type = empty;
  }

  inline
  int
  ]b4_parser_class_name[::by_type::type_get () const
  {
    return type;
  }
]b4_token_ctor_if([[
  inline
  ]b4_parser_class_name[::token_type
  ]b4_parser_class_name[::by_type::token () const
  {
    // YYTOKNUM[NUM] -- (External) token number corresponding to the
    // (internal) symbol number NUM (which must be that of a token).  */
    static
    const ]b4_int_type_for([b4_toknum])[
    yytoken_number_[] =
    {
  ]b4_toknum[
    };
    return static_cast<token_type> (yytoken_number_[type]);
  }
]])[]dnl
b4_symbol_constructor_define])


# b4_symbol_constructor_declare
# b4_symbol_constructor_define
# -----------------------------
# Declare/define symbol constructors for all the value types.
# Use at class-level.  Redefined in variant.hh.
m4_define([b4_symbol_constructor_declare], [])
m4_define([b4_symbol_constructor_define], [])


# b4_yytranslate_define
# ---------------------
# Define yytranslate_.  Sometimes used in the header file,
# sometimes in the cc file.
m4_define([b4_yytranslate_define],
[[  // Symbol number corresponding to token number t.
  inline
  ]b4_parser_class_name[::token_number_type
  ]b4_parser_class_name[::yytranslate_ (]b4_token_ctor_if([token_type],
                                                          [int])[ t)
  {
    static
    const token_number_type
    translate_table[] =
    {
]b4_translate[
    };
    const unsigned int user_token_number_max_ = ]b4_user_token_number_max[;
    const token_number_type undef_token_ = ]b4_undef_token_number[;

    if (static_cast<int>(t) <= yyeof_)
      return yyeof_;
    else if (static_cast<unsigned int> (t) <= user_token_number_max_)
      return translate_table[t];
    else
      return undef_token_;
  }
]])


# b4_lhs_value([TYPE])
# --------------------
# Expansion of $<TYPE>$.
m4_define([b4_lhs_value],
[b4_symbol_value([yyval], [$1])])


# b4_rhs_value(RULE-LENGTH, NUM, [TYPE])
# --------------------------------------
# Expansion of $<TYPE>NUM, where the current rule has RULE-LENGTH
# symbols on RHS.
m4_define([b4_rhs_value],
[b4_symbol_value([yysemantic_stack_@{($1) - ($2)@}], [$3])])


# b4_lhs_location()
# -----------------
# Expansion of @$.
m4_define([b4_lhs_location],
[(yyloc)])


# b4_rhs_location(RULE-LENGTH, NUM)
# ---------------------------------
# Expansion of @NUM, where the current rule has RULE-LENGTH symbols
# on RHS.
m4_define([b4_rhs_location],
[(yylocation_stack_@{($1) - ($2)@})])


# b4_parse_param_decl
# -------------------
# Extra formal arguments of the constructor.
# Change the parameter names from "foo" into "foo_yyarg", so that
# there is no collision bw the user chosen attribute name, and the
# argument name in the constructor.
m4_define([b4_parse_param_decl],
[m4_ifset([b4_parse_param],
          [m4_map_sep([b4_parse_param_decl_1], [, ], [b4_parse_param])])])

m4_define([b4_parse_param_decl_1],
[$1_yyarg])



# b4_parse_param_cons
# -------------------
# Extra initialisations of the constructor.
m4_define([b4_parse_param_cons],
          [m4_ifset([b4_parse_param],
                    [
      b4_cc_constructor_calls(b4_parse_param)])])
m4_define([b4_cc_constructor_calls],
          [m4_map_sep([b4_cc_constructor_call], [,
      ], [$@])])
m4_define([b4_cc_constructor_call],
          [$2 ($2_yyarg)])

# b4_parse_param_vars
# -------------------
# Extra instance variables.
m4_define([b4_parse_param_vars],
          [m4_ifset([b4_parse_param],
                    [
    // User arguments.
b4_cc_var_decls(b4_parse_param)])])
m4_define([b4_cc_var_decls],
          [m4_map_sep([b4_cc_var_decl], [
], [$@])])
m4_define([b4_cc_var_decl],
          [    $1;])


## ---------##
## Values.  ##
## ---------##

# b4_yylloc_default_define
# ------------------------
# Define YYLLOC_DEFAULT.
m4_define([b4_yylloc_default_define],
[[/* YYLLOC_DEFAULT -- Set CURRENT to span from RHS[1] to RHS[N].
   If N is 0, then set CURRENT to the empty location which ends
   the previous symbol: RHS[0] (always defined).  */

# ifndef YYLLOC_DEFAULT
#  define YYLLOC_DEFAULT(Current, Rhs, N)                               \
    do                                                                  \
      if (N)                                                            \
        {                                                               \
          (Current).begin  = YYRHSLOC (Rhs, 1).begin;                   \
          (Current).end    = YYRHSLOC (Rhs, N).end;                     \
        }                                                               \
      else                                                              \
        {                                                               \
          (Current).begin = (Current).end = YYRHSLOC (Rhs, 0).end;      \
        }                                                               \
    while (/*CONSTCOND*/ false)
# endif
]])

## -------- ##
## Checks.  ##
## -------- ##

b4_token_ctor_if([b4_variant_if([],
  [b4_fatal_at(b4_percent_define_get_loc(api.token.constructor),
               [cannot use '%s' without '%s'],
               [%define api.token.constructor],
               [%define api.value.type variant]))])])