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 EXTENSION_KEYW
65 %token FLOAT_KEYW
66 %token INLINE_KEYW
67 %token INT_KEYW
68 %token LONG_KEYW
69 %token REGISTER_KEYW
70 %token RESTRICT_KEYW
71 %token SHORT_KEYW
72 %token SIGNED_KEYW
73 %token STATIC_KEYW
74 %token STRUCT_KEYW
75 %token TYPEDEF_KEYW
76 %token UNION_KEYW
77 %token UNSIGNED_KEYW
78 %token VOID_KEYW
79 %token VOLATILE_KEYW
80 %token TYPEOF_KEYW
81
82 %token EXPORT_SYMBOL_KEYW
83
84 %token ASM_PHRASE
85 %token ATTRIBUTE_PHRASE
86 %token BRACE_PHRASE
87 %token BRACKET_PHRASE
88 %token EXPRESSION_PHRASE
89
90 %token CHAR
91 %token DOTS
92 %token IDENT
93 %token INT
94 %token REAL
95 %token STRING
96 %token TYPE
97 %token OTHER
98 %token FILENAME
99
100 %%
101
102 declaration_seq:
103 declaration
104 | declaration_seq declaration
105 ;
106
107 declaration:
108 { is_typedef = 0; is_extern = 0; current_name = NULL; decl_spec = NULL; }
109 declaration1
110 { free_list(*$2, NULL); *$2 = NULL; }
111 ;
112
113 declaration1:
114 EXTENSION_KEYW TYPEDEF_KEYW { is_typedef = 1; } simple_declaration
115 { $$ = $4; }
116 | TYPEDEF_KEYW { is_typedef = 1; } simple_declaration
117 { $$ = $3; }
118 | simple_declaration
119 | function_definition
120 | asm_definition
121 | export_definition
122 | error ';' { $$ = $2; }
123 | error '}' { $$ = $2; }
124 ;
125
126 simple_declaration:
127 decl_specifier_seq_opt init_declarator_list_opt ';'
128 { if (current_name) {
129 struct string_list *decl = (*$3)->next;
130 (*$3)->next = NULL;
131 add_symbol(current_name,
132 is_typedef ? SYM_TYPEDEF : SYM_NORMAL,
133 decl, is_extern);
134 current_name = NULL;
135 }
136 $$ = $3;
137 }
138 ;
139
140 init_declarator_list_opt:
141 /* empty */ { $$ = NULL; }
142 | init_declarator_list
143 ;
144
145 init_declarator_list:
146 init_declarator
147 { struct string_list *decl = *$1;
148 *$1 = NULL;
149 add_symbol(current_name,
150 is_typedef ? SYM_TYPEDEF : SYM_NORMAL, decl, is_extern);
151 current_name = NULL;
152 $$ = $1;
153 }
154 | init_declarator_list ',' init_declarator
155 { struct string_list *decl = *$3;
156 *$3 = NULL;
157 free_list(*$2, NULL);
158 *$2 = decl_spec;
159 add_symbol(current_name,
160 is_typedef ? SYM_TYPEDEF : SYM_NORMAL, decl, is_extern);
161 current_name = NULL;
162 $$ = $3;
163 }
164 ;
165
166 init_declarator:
167 declarator asm_phrase_opt attribute_opt initializer_opt
168 { $$ = $4 ? $4 : $3 ? $3 : $2 ? $2 : $1; }
169 ;
170
171 /* Hang on to the specifiers so that we can reuse them. */
172 decl_specifier_seq_opt:
173 /* empty */ { decl_spec = NULL; }
174 | decl_specifier_seq
175 ;
176
177 decl_specifier_seq:
178 decl_specifier { decl_spec = *$1; }
179 | decl_specifier_seq decl_specifier { decl_spec = *$2; }
180 ;
181
182 decl_specifier:
183 storage_class_specifier
184 { /* Version 2 checksumming ignores storage class, as that
185 is really irrelevant to the linkage. */
186 remove_node($1);
187 $$ = $1;
188 }
189 | type_specifier
190 ;
191
192 storage_class_specifier:
193 AUTO_KEYW
194 | REGISTER_KEYW
195 | STATIC_KEYW
196 | EXTERN_KEYW { is_extern = 1; $$ = $1; }
197 | INLINE_KEYW { is_extern = 0; $$ = $1; }
198 ;
199
200 type_specifier:
201 simple_type_specifier
202 | cvar_qualifier
203 | TYPEOF_KEYW '(' decl_specifier_seq '*' ')'
204 | TYPEOF_KEYW '(' decl_specifier_seq ')'
205
206 /* References to s/u/e's defined elsewhere. Rearrange things
207 so that it is easier to expand the definition fully later. */
208 | STRUCT_KEYW IDENT
209 { remove_node($1); (*$2)->tag = SYM_STRUCT; $$ = $2; }
210 | UNION_KEYW IDENT
211 { remove_node($1); (*$2)->tag = SYM_UNION; $$ = $2; }
212 | ENUM_KEYW IDENT
213 { remove_node($1); (*$2)->tag = SYM_ENUM; $$ = $2; }
214
215 /* Full definitions of an s/u/e. Record it. */
216 | STRUCT_KEYW IDENT class_body
217 { struct string_list *s = *$3, *i = *$2, *r;
218 r = copy_node(i); r->tag = SYM_STRUCT;
219 r->next = (*$1)->next; *$3 = r; (*$1)->next = NULL;
220 add_symbol(i->string, SYM_STRUCT, s, is_extern);
221 $$ = $3;
222 }
223 | UNION_KEYW IDENT class_body
224 { struct string_list *s = *$3, *i = *$2, *r;
225 r = copy_node(i); r->tag = SYM_UNION;
226 r->next = (*$1)->next; *$3 = r; (*$1)->next = NULL;
227 add_symbol(i->string, SYM_UNION, s, is_extern);
228 $$ = $3;
229 }
230 | ENUM_KEYW IDENT BRACE_PHRASE
231 { struct string_list *s = *$3, *i = *$2, *r;
232 r = copy_node(i); r->tag = SYM_ENUM;
233 r->next = (*$1)->next; *$3 = r; (*$1)->next = NULL;
234 add_symbol(i->string, SYM_ENUM, s, is_extern);
235 $$ = $3;
236 }
237
238 /* Anonymous s/u/e definitions. Nothing needs doing. */
239 | ENUM_KEYW BRACE_PHRASE { $$ = $2; }
240 | STRUCT_KEYW class_body { $$ = $2; }
241 | UNION_KEYW class_body { $$ = $2; }
242 ;
243
244 simple_type_specifier:
245 CHAR_KEYW
246 | SHORT_KEYW
247 | INT_KEYW
248 | LONG_KEYW
249 | SIGNED_KEYW
250 | UNSIGNED_KEYW
251 | FLOAT_KEYW
252 | DOUBLE_KEYW
253 | VOID_KEYW
254 | BOOL_KEYW
255 | TYPE { (*$1)->tag = SYM_TYPEDEF; $$ = $1; }
256 ;
257
258 ptr_operator:
259 '*' cvar_qualifier_seq_opt
260 { $$ = $2 ? $2 : $1; }
261 ;
262
263 cvar_qualifier_seq_opt:
264 /* empty */ { $$ = NULL; }
265 | cvar_qualifier_seq
266 ;
267
268 cvar_qualifier_seq:
269 cvar_qualifier
270 | cvar_qualifier_seq cvar_qualifier { $$ = $2; }
271 ;
272
273 cvar_qualifier:
274 CONST_KEYW | VOLATILE_KEYW | ATTRIBUTE_PHRASE
275 | RESTRICT_KEYW
276 { /* restrict has no effect in prototypes so ignore it */
277 remove_node($1);
278 $$ = $1;
279 }
280 ;
281
282 declarator:
283 ptr_operator declarator { $$ = $2; }
284 | direct_declarator
285 ;
286
287 direct_declarator:
288 IDENT
289 { if (current_name != NULL) {
290 error_with_pos("unexpected second declaration name");
291 YYERROR;
292 } else {
293 current_name = (*$1)->string;
294 $$ = $1;
295 }
296 }
297 | direct_declarator '(' parameter_declaration_clause ')'
298 { $$ = $4; }
299 | direct_declarator '(' error ')'
300 { $$ = $4; }
301 | direct_declarator BRACKET_PHRASE
302 { $$ = $2; }
303 | '(' declarator ')'
304 { $$ = $3; }
305 | '(' error ')'
306 { $$ = $3; }
307 ;
308
309 /* Nested declarators differ from regular declarators in that they do
310 not record the symbols they find in the global symbol table. */
311 nested_declarator:
312 ptr_operator nested_declarator { $$ = $2; }
313 | direct_nested_declarator
314 ;
315
316 direct_nested_declarator:
317 IDENT
318 | TYPE
319 | direct_nested_declarator '(' parameter_declaration_clause ')'
320 { $$ = $4; }
321 | direct_nested_declarator '(' error ')'
322 { $$ = $4; }
323 | direct_nested_declarator BRACKET_PHRASE
324 { $$ = $2; }
325 | '(' nested_declarator ')'
326 { $$ = $3; }
327 | '(' error ')'
328 { $$ = $3; }
329 ;
330
331 parameter_declaration_clause:
332 parameter_declaration_list_opt DOTS { $$ = $2; }
333 | parameter_declaration_list_opt
334 | parameter_declaration_list ',' DOTS { $$ = $3; }
335 ;
336
337 parameter_declaration_list_opt:
338 /* empty */ { $$ = NULL; }
339 | parameter_declaration_list
340 ;
341
342 parameter_declaration_list:
343 parameter_declaration
344 | parameter_declaration_list ',' parameter_declaration
345 { $$ = $3; }
346 ;
347
348 parameter_declaration:
349 decl_specifier_seq m_abstract_declarator
350 { $$ = $2 ? $2 : $1; }
351 ;
352
353 m_abstract_declarator:
354 ptr_operator m_abstract_declarator
355 { $$ = $2 ? $2 : $1; }
356 | direct_m_abstract_declarator
357 ;
358
359 direct_m_abstract_declarator:
360 /* empty */ { $$ = NULL; }
361 | IDENT
362 { /* For version 2 checksums, we don't want to remember
363 private parameter names. */
364 remove_node($1);
365 $$ = $1;
366 }
367 /* This wasn't really a typedef name but an identifier that
368 shadows one. */
369 | TYPE
370 { remove_node($1);
371 $$ = $1;
372 }
373 | direct_m_abstract_declarator '(' parameter_declaration_clause ')'
374 { $$ = $4; }
375 | direct_m_abstract_declarator '(' error ')'
376 { $$ = $4; }
377 | direct_m_abstract_declarator BRACKET_PHRASE
378 { $$ = $2; }
379 | '(' m_abstract_declarator ')'
380 { $$ = $3; }
381 | '(' error ')'
382 { $$ = $3; }
383 ;
384
385 function_definition:
386 decl_specifier_seq_opt declarator BRACE_PHRASE
387 { struct string_list *decl = *$2;
388 *$2 = NULL;
389 add_symbol(current_name, SYM_NORMAL, decl, is_extern);
390 $$ = $3;
391 }
392 ;
393
394 initializer_opt:
395 /* empty */ { $$ = NULL; }
396 | initializer
397 ;
398
399 /* We never care about the contents of an initializer. */
400 initializer:
401 '=' EXPRESSION_PHRASE
402 { remove_list($2, &(*$1)->next); $$ = $2; }
403 ;
404
405 class_body:
406 '{' member_specification_opt '}' { $$ = $3; }
407 | '{' error '}' { $$ = $3; }
408 ;
409
410 member_specification_opt:
411 /* empty */ { $$ = NULL; }
412 | member_specification
413 ;
414
415 member_specification:
416 member_declaration
417 | member_specification member_declaration { $$ = $2; }
418 ;
419
420 member_declaration:
421 decl_specifier_seq_opt member_declarator_list_opt ';'
422 { $$ = $3; }
423 | error ';'
424 { $$ = $2; }
425 ;
426
427 member_declarator_list_opt:
428 /* empty */ { $$ = NULL; }
429 | member_declarator_list
430 ;
431
432 member_declarator_list:
433 member_declarator
434 | member_declarator_list ',' member_declarator { $$ = $3; }
435 ;
436
437 member_declarator:
438 nested_declarator attribute_opt { $$ = $2 ? $2 : $1; }
439 | IDENT member_bitfield_declarator { $$ = $2; }
440 | member_bitfield_declarator
441 ;
442
443 member_bitfield_declarator:
444 ':' EXPRESSION_PHRASE { $$ = $2; }
445 ;
446
447 attribute_opt:
448 /* empty */ { $$ = NULL; }
449 | ATTRIBUTE_PHRASE
450 ;
451
452 asm_definition:
453 ASM_PHRASE ';' { $$ = $2; }
454 ;
455
456 asm_phrase_opt:
457 /* empty */ { $$ = NULL; }
458 | ASM_PHRASE
459 ;
460
461 export_definition:
462 EXPORT_SYMBOL_KEYW '(' IDENT ')' ';'
463 { export_symbol((*$3)->string); $$ = $5; }
464 ;
465
466
467 %%
468
469 static void
470 yyerror(const char *e)
471 {
472 error_with_pos("%s", e);
473 }
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