scripts/genksyms/parse.y

   1 /* C global declaration parser for genksyms.
   2    Copyright 1996, 1997 Linux International.
   3
   4    New implementation contributed by Richard Henderson <rth@tamu.edu>
   5    Based on original work by Bjorn Ekwall <bj0rn@blox.se>
   6
   7    This file is part of the Linux modutils.
   8
   9    This program is free software; you can redistribute it and/or modify it
  10    under the terms of the GNU General Public License as published by the
  11    Free Software Foundation; either version 2 of the License, or (at your
  12    option) any later version.
  13
  14    This program is distributed in the hope that it will be useful, but
  15    WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17    General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software Foundation,
  21    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  22
  23
  24 %{
  25
  26 #include <assert.h>
  27 #include <malloc.h>
  28 #include "genksyms.h"
  29
  30 static int is_typedef;
  31 static int is_extern;
  32 static char *current_name;
  33 static struct string_list *decl_spec;
  34
  35 static void yyerror(const char *);
  36
  37 static inline void
  38 remove_node(struct string_list **p)
  39 {
  40   struct string_list *node = *p;
  41   *p = node->next;
  42   free_node(node);
  43 }
  44
  45 static inline void
  46 remove_list(struct string_list **pb, struct string_list **pe)
  47 {
  48   struct string_list *b = *pb, *e = *pe;
  49   *pb = e;
  50   free_list(b, e);
  51 }
  52
  53 %}
  54
  55 %token ASM_KEYW
  56 %token ATTRIBUTE_KEYW
  57 %token AUTO_KEYW
  58 %token BOOL_KEYW
  59 %token CHAR_KEYW
  60 %token CONST_KEYW
  61 %token DOUBLE_KEYW
  62 %token ENUM_KEYW
  63 %token EXTERN_KEYW
  64 %token FLOAT_KEYW
  65 %token INLINE_KEYW
  66 %token INT_KEYW
  67 %token LONG_KEYW
  68 %token REGISTER_KEYW
  69 %token RESTRICT_KEYW
  70 %token SHORT_KEYW
  71 %token SIGNED_KEYW
  72 %token STATIC_KEYW
  73 %token STRUCT_KEYW
  74 %token TYPEDEF_KEYW
  75 %token UNION_KEYW
  76 %token UNSIGNED_KEYW
  77 %token VOID_KEYW
  78 %token VOLATILE_KEYW
  79 %token TYPEOF_KEYW
  80
  81 %token EXPORT_SYMBOL_KEYW
  82
  83 %token ASM_PHRASE
  84 %token ATTRIBUTE_PHRASE
  85 %token BRACE_PHRASE
  86 %token BRACKET_PHRASE
  87 %token EXPRESSION_PHRASE
  88
  89 %token CHAR
  90 %token DOTS
  91 %token IDENT
  92 %token INT
  93 %token REAL
  94 %token STRING
  95 %token TYPE
  96 %token OTHER
  97 %token FILENAME
  98
  99 %%
 100
 101 declaration_seq:
 102         declaration
 103         | declaration_seq declaration
 104         ;
 105
 106 declaration:
 107         { is_typedef = 0; is_extern = 0; current_name = NULL; decl_spec = NULL; }
 108         declaration1
 109         { free_list(*$2, NULL); *$2 = NULL; }
 110         ;
 111
 112 declaration1:
 113         TYPEDEF_KEYW { is_typedef = 1; } simple_declaration
 114                 { $$ = $3; }
 115         | simple_declaration
 116         | function_definition
 117         | asm_definition
 118         | export_definition
 119         | error ';'                             { $$ = $2; }
 120         | error '}'                             { $$ = $2; }
 121         ;
 122
 123 simple_declaration:
 124         decl_specifier_seq_opt init_declarator_list_opt ';'
 125                 { if (current_name) {
 126                     struct string_list *decl = (*$3)->next;
 127                     (*$3)->next = NULL;
 128                     add_symbol(current_name,
 129                                is_typedef ? SYM_TYPEDEF : SYM_NORMAL,
 130                                decl, is_extern);
 131                     current_name = NULL;
 132                   }
 133                   $$ = $3;
 134                 }
 135         ;
 136
 137 init_declarator_list_opt:
 138         /* empty */                             { $$ = NULL; }
 139         | init_declarator_list
 140         ;
 141
 142 init_declarator_list:
 143         init_declarator
 144                 { struct string_list *decl = *$1;
 145                   *$1 = NULL;
 146                   add_symbol(current_name,
 147                              is_typedef ? SYM_TYPEDEF : SYM_NORMAL, decl, is_extern);
 148                   current_name = NULL;
 149                   $$ = $1;
 150                 }
 151         | init_declarator_list ',' init_declarator
 152                 { struct string_list *decl = *$3;
 153                   *$3 = NULL;
 154                   free_list(*$2, NULL);
 155                   *$2 = decl_spec;
 156                   add_symbol(current_name,
 157                              is_typedef ? SYM_TYPEDEF : SYM_NORMAL, decl, is_extern);
 158                   current_name = NULL;
 159                   $$ = $3;
 160                 }
 161         ;
 162
 163 init_declarator:
 164         declarator asm_phrase_opt attribute_opt initializer_opt
 165                 { $$ = $4 ? $4 : $3 ? $3 : $2 ? $2 : $1; }
 166         ;
 167
 168 /* Hang on to the specifiers so that we can reuse them.  */
 169 decl_specifier_seq_opt:
 170         /* empty */                             { decl_spec = NULL; }
 171         | decl_specifier_seq
 172         ;
 173
 174 decl_specifier_seq:
 175         decl_specifier                          { decl_spec = *$1; }
 176         | decl_specifier_seq decl_specifier     { decl_spec = *$2; }
 177         ;
 178
 179 decl_specifier:
 180         storage_class_specifier
 181                 { /* Version 2 checksumming ignores storage class, as that
 182                      is really irrelevant to the linkage.  */
 183                   remove_node($1);
 184                   $$ = $1;
 185                 }
 186         | type_specifier
 187         ;
 188
 189 storage_class_specifier:
 190         AUTO_KEYW
 191         | REGISTER_KEYW
 192         | STATIC_KEYW
 193         | EXTERN_KEYW   { is_extern = 1; $$ = $1; }
 194         | INLINE_KEYW   { is_extern = 0; $$ = $1; }
 195         ;
 196
 197 type_specifier:
 198         simple_type_specifier
 199         | cvar_qualifier
 200         | TYPEOF_KEYW '(' decl_specifier_seq ')'
 201
 202         /* References to s/u/e's defined elsewhere.  Rearrange things
 203            so that it is easier to expand the definition fully later.  */
 204         | STRUCT_KEYW IDENT
 205                 { remove_node($1); (*$2)->tag = SYM_STRUCT; $$ = $2; }
 206         | UNION_KEYW IDENT
 207                 { remove_node($1); (*$2)->tag = SYM_UNION; $$ = $2; }
 208         | ENUM_KEYW IDENT
 209                 { remove_node($1); (*$2)->tag = SYM_ENUM; $$ = $2; }
 210
 211         /* Full definitions of an s/u/e.  Record it.  */
 212         | STRUCT_KEYW IDENT class_body
 213                 { struct string_list *s = *$3, *i = *$2, *r;
 214                   r = copy_node(i); r->tag = SYM_STRUCT;
 215                   r->next = (*$1)->next; *$3 = r; (*$1)->next = NULL;
 216                   add_symbol(i->string, SYM_STRUCT, s, is_extern);
 217                   $$ = $3;
 218                 }
 219         | UNION_KEYW IDENT class_body
 220                 { struct string_list *s = *$3, *i = *$2, *r;
 221                   r = copy_node(i); r->tag = SYM_UNION;
 222                   r->next = (*$1)->next; *$3 = r; (*$1)->next = NULL;
 223                   add_symbol(i->string, SYM_UNION, s, is_extern);
 224                   $$ = $3;
 225                 }
 226         | ENUM_KEYW IDENT BRACE_PHRASE
 227                 { struct string_list *s = *$3, *i = *$2, *r;
 228                   r = copy_node(i); r->tag = SYM_ENUM;
 229                   r->next = (*$1)->next; *$3 = r; (*$1)->next = NULL;
 230                   add_symbol(i->string, SYM_ENUM, s, is_extern);
 231                   $$ = $3;
 232                 }
 233
 234         /* Anonymous s/u/e definitions.  Nothing needs doing.  */
 235         | ENUM_KEYW BRACE_PHRASE                        { $$ = $2; }
 236         | STRUCT_KEYW class_body                        { $$ = $2; }
 237         | UNION_KEYW class_body                         { $$ = $2; }
 238         ;
 239
 240 simple_type_specifier:
 241         CHAR_KEYW
 242         | SHORT_KEYW
 243         | INT_KEYW
 244         | LONG_KEYW
 245         | SIGNED_KEYW
 246         | UNSIGNED_KEYW
 247         | FLOAT_KEYW
 248         | DOUBLE_KEYW
 249         | VOID_KEYW
 250         | BOOL_KEYW
 251         | TYPE                  { (*$1)->tag = SYM_TYPEDEF; $$ = $1; }
 252         ;
 253
 254 ptr_operator:
 255         '*' cvar_qualifier_seq_opt
 256                 { $$ = $2 ? $2 : $1; }
 257         ;
 258
 259 cvar_qualifier_seq_opt:
 260         /* empty */                                     { $$ = NULL; }
 261         | cvar_qualifier_seq
 262         ;
 263
 264 cvar_qualifier_seq:
 265         cvar_qualifier
 266         | cvar_qualifier_seq cvar_qualifier             { $$ = $2; }
 267         ;
 268
 269 cvar_qualifier:
 270         CONST_KEYW | VOLATILE_KEYW | ATTRIBUTE_PHRASE
 271         | RESTRICT_KEYW
 272                 { /* restrict has no effect in prototypes so ignore it */
 273                   remove_node($1);
 274                   $$ = $1;
 275                 }
 276         ;
 277
 278 declarator:
 279         ptr_operator declarator                 { $$ = $2; }
 280         | direct_declarator
 281         ;
 282
 283 direct_declarator:
 284         IDENT
 285                 { if (current_name != NULL) {
 286                     error_with_pos("unexpected second declaration name");
 287                     YYERROR;
 288                   } else {
 289                     current_name = (*$1)->string;
 290                     $$ = $1;
 291                   }
 292                 }
 293         | direct_declarator '(' parameter_declaration_clause ')'
 294                 { $$ = $4; }
 295         | direct_declarator '(' error ')'
 296                 { $$ = $4; }
 297         | direct_declarator BRACKET_PHRASE
 298                 { $$ = $2; }
 299         | '(' declarator ')'
 300                 { $$ = $3; }
 301         | '(' error ')'
 302                 { $$ = $3; }
 303         ;
 304
 305 /* Nested declarators differ from regular declarators in that they do
 306    not record the symbols they find in the global symbol table.  */
 307 nested_declarator:
 308         ptr_operator nested_declarator          { $$ = $2; }
 309         | direct_nested_declarator
 310         ;
 311
 312 direct_nested_declarator:
 313         IDENT
 314         | TYPE
 315         | direct_nested_declarator '(' parameter_declaration_clause ')'
 316                 { $$ = $4; }
 317         | direct_nested_declarator '(' error ')'
 318                 { $$ = $4; }
 319         | direct_nested_declarator BRACKET_PHRASE
 320                 { $$ = $2; }
 321         | '(' nested_declarator ')'
 322                 { $$ = $3; }
 323         | '(' error ')'
 324                 { $$ = $3; }
 325         ;
 326
 327 parameter_declaration_clause:
 328         parameter_declaration_list_opt DOTS             { $$ = $2; }
 329         | parameter_declaration_list_opt
 330         | parameter_declaration_list ',' DOTS           { $$ = $3; }
 331         ;
 332
 333 parameter_declaration_list_opt:
 334         /* empty */                                     { $$ = NULL; }
 335         | parameter_declaration_list
 336         ;
 337
 338 parameter_declaration_list:
 339         parameter_declaration
 340         | parameter_declaration_list ',' parameter_declaration
 341                 { $$ = $3; }
 342         ;
 343
 344 parameter_declaration:
 345         decl_specifier_seq m_abstract_declarator
 346                 { $$ = $2 ? $2 : $1; }
 347         ;
 348
 349 m_abstract_declarator:
 350         ptr_operator m_abstract_declarator
 351                 { $$ = $2 ? $2 : $1; }
 352         | direct_m_abstract_declarator
 353         ;
 354
 355 direct_m_abstract_declarator:
 356         /* empty */                                     { $$ = NULL; }
 357         | IDENT
 358                 { /* For version 2 checksums, we don't want to remember
 359                      private parameter names.  */
 360                   remove_node($1);
 361                   $$ = $1;
 362                 }
 363         /* This wasn't really a typedef name but an identifier that
 364            shadows one.  */
 365         | TYPE
 366                 { remove_node($1);
 367                   $$ = $1;
 368                 }
 369         | direct_m_abstract_declarator '(' parameter_declaration_clause ')'
 370                 { $$ = $4; }
 371         | direct_m_abstract_declarator '(' error ')'
 372                 { $$ = $4; }
 373         | direct_m_abstract_declarator BRACKET_PHRASE
 374                 { $$ = $2; }
 375         | '(' m_abstract_declarator ')'
 376                 { $$ = $3; }
 377         | '(' error ')'
 378                 { $$ = $3; }
 379         ;
 380
 381 function_definition:
 382         decl_specifier_seq_opt declarator BRACE_PHRASE
 383                 { struct string_list *decl = *$2;
 384                   *$2 = NULL;
 385                   add_symbol(current_name, SYM_NORMAL, decl, is_extern);
 386                   $$ = $3;
 387                 }
 388         ;
 389
 390 initializer_opt:
 391         /* empty */                                     { $$ = NULL; }
 392         | initializer
 393         ;
 394
 395 /* We never care about the contents of an initializer.  */
 396 initializer:
 397         '=' EXPRESSION_PHRASE
 398                 { remove_list($2, &(*$1)->next); $$ = $2; }
 399         ;
 400
 401 class_body:
 402         '{' member_specification_opt '}'                { $$ = $3; }
 403         | '{' error '}'                                 { $$ = $3; }
 404         ;
 405
 406 member_specification_opt:
 407         /* empty */                                     { $$ = NULL; }
 408         | member_specification
 409         ;
 410
 411 member_specification:
 412         member_declaration
 413         | member_specification member_declaration       { $$ = $2; }
 414         ;
 415
 416 member_declaration:
 417         decl_specifier_seq_opt member_declarator_list_opt ';'
 418                 { $$ = $3; }
 419         | error ';'
 420                 { $$ = $2; }
 421         ;
 422
 423 member_declarator_list_opt:
 424         /* empty */                                     { $$ = NULL; }
 425         | member_declarator_list
 426         ;
 427
 428 member_declarator_list:
 429         member_declarator
 430         | member_declarator_list ',' member_declarator  { $$ = $3; }
 431         ;
 432
 433 member_declarator:
 434         nested_declarator attribute_opt                 { $$ = $2 ? $2 : $1; }
 435         | IDENT member_bitfield_declarator              { $$ = $2; }
 436         | member_bitfield_declarator
 437         ;
 438
 439 member_bitfield_declarator:
 440         ':' EXPRESSION_PHRASE                           { $$ = $2; }
 441         ;
 442
 443 attribute_opt:
 444         /* empty */                                     { $$ = NULL; }
 445         | ATTRIBUTE_PHRASE
 446         ;
 447
 448 asm_definition:
 449         ASM_PHRASE ';'                                  { $$ = $2; }
 450         ;
 451
 452 asm_phrase_opt:
 453         /* empty */                                     { $$ = NULL; }
 454         | ASM_PHRASE
 455         ;
 456
 457 export_definition:
 458         EXPORT_SYMBOL_KEYW '(' IDENT ')' ';'
 459                 { export_symbol((*$3)->string); $$ = $5; }
 460         ;
 461
 462
 463 %%
 464
 465 static void
 466 yyerror(const char *e)
 467 {
 468   error_with_pos("%s", e);
 469 }