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 <stdlib.h>
28 #include <string.h>
29 #include "genksyms.h"
30
31 static int is_typedef;
32 static int is_extern;
33 static char *current_name;
34 static struct string_list *decl_spec;
35
36 static void yyerror(const char *);
37
38 static inline void
remove_node(struct string_list ** p)39 remove_node(struct string_list **p)
40 {
41 struct string_list *node = *p;
42 *p = node->next;
43 free_node(node);
44 }
45
46 static inline void
remove_list(struct string_list ** pb,struct string_list ** pe)47 remove_list(struct string_list **pb, struct string_list **pe)
48 {
49 struct string_list *b = *pb, *e = *pe;
50 *pb = e;
51 free_list(b, e);
52 }
53
54 /* Record definition of a struct/union/enum */
record_compound(struct string_list ** keyw,struct string_list ** ident,struct string_list ** body,enum symbol_type type)55 static void record_compound(struct string_list **keyw,
56 struct string_list **ident,
57 struct string_list **body,
58 enum symbol_type type)
59 {
60 struct string_list *b = *body, *i = *ident, *r;
61
62 if (i->in_source_file) {
63 remove_node(keyw);
64 (*ident)->tag = type;
65 remove_list(body, ident);
66 return;
67 }
68 r = copy_node(i); r->tag = type;
69 r->next = (*keyw)->next; *body = r; (*keyw)->next = NULL;
70 add_symbol(i->string, type, b, is_extern);
71 }
72
73 %}
74
75 %token ASM_KEYW
76 %token ATTRIBUTE_KEYW
77 %token AUTO_KEYW
78 %token BOOL_KEYW
79 %token CHAR_KEYW
80 %token CONST_KEYW
81 %token DOUBLE_KEYW
82 %token ENUM_KEYW
83 %token EXTERN_KEYW
84 %token EXTENSION_KEYW
85 %token FLOAT_KEYW
86 %token INLINE_KEYW
87 %token INT_KEYW
88 %token LONG_KEYW
89 %token REGISTER_KEYW
90 %token RESTRICT_KEYW
91 %token SHORT_KEYW
92 %token SIGNED_KEYW
93 %token STATIC_KEYW
94 %token STRUCT_KEYW
95 %token TYPEDEF_KEYW
96 %token UNION_KEYW
97 %token UNSIGNED_KEYW
98 %token VOID_KEYW
99 %token VOLATILE_KEYW
100 %token TYPEOF_KEYW
101
102 %token EXPORT_SYMBOL_KEYW
103
104 %token ASM_PHRASE
105 %token ATTRIBUTE_PHRASE
106 %token BRACE_PHRASE
107 %token BRACKET_PHRASE
108 %token EXPRESSION_PHRASE
109
110 %token CHAR
111 %token DOTS
112 %token IDENT
113 %token INT
114 %token REAL
115 %token STRING
116 %token TYPE
117 %token OTHER
118 %token FILENAME
119
120 %%
121
122 declaration_seq:
123 declaration
124 | declaration_seq declaration
125 ;
126
127 declaration:
128 { is_typedef = 0; is_extern = 0; current_name = NULL; decl_spec = NULL; }
129 declaration1
130 { free_list(*$2, NULL); *$2 = NULL; }
131 ;
132
133 declaration1:
134 EXTENSION_KEYW TYPEDEF_KEYW { is_typedef = 1; } simple_declaration
135 { $$ = $4; }
136 | TYPEDEF_KEYW { is_typedef = 1; } simple_declaration
137 { $$ = $3; }
138 | simple_declaration
139 | function_definition
140 | asm_definition
141 | export_definition
142 | error ';' { $$ = $2; }
143 | error '}' { $$ = $2; }
144 ;
145
146 simple_declaration:
147 decl_specifier_seq_opt init_declarator_list_opt ';'
148 { if (current_name) {
149 struct string_list *decl = (*$3)->next;
150 (*$3)->next = NULL;
151 add_symbol(current_name,
152 is_typedef ? SYM_TYPEDEF : SYM_NORMAL,
153 decl, is_extern);
154 current_name = NULL;
155 }
156 $$ = $3;
157 }
158 ;
159
160 init_declarator_list_opt:
161 /* empty */ { $$ = NULL; }
162 | init_declarator_list
163 ;
164
165 init_declarator_list:
166 init_declarator
167 { struct string_list *decl = *$1;
168 *$1 = NULL;
169 add_symbol(current_name,
170 is_typedef ? SYM_TYPEDEF : SYM_NORMAL, decl, is_extern);
171 current_name = NULL;
172 $$ = $1;
173 }
174 | init_declarator_list ',' init_declarator
175 { struct string_list *decl = *$3;
176 *$3 = NULL;
177 free_list(*$2, NULL);
178 *$2 = decl_spec;
179 add_symbol(current_name,
180 is_typedef ? SYM_TYPEDEF : SYM_NORMAL, decl, is_extern);
181 current_name = NULL;
182 $$ = $3;
183 }
184 ;
185
186 init_declarator:
187 declarator asm_phrase_opt attribute_opt initializer_opt
188 { $$ = $4 ? $4 : $3 ? $3 : $2 ? $2 : $1; }
189 ;
190
191 /* Hang on to the specifiers so that we can reuse them. */
192 decl_specifier_seq_opt:
193 /* empty */ { decl_spec = NULL; }
194 | decl_specifier_seq
195 ;
196
197 decl_specifier_seq:
198 decl_specifier { decl_spec = *$1; }
199 | decl_specifier_seq decl_specifier { decl_spec = *$2; }
200 ;
201
202 decl_specifier:
203 storage_class_specifier
204 { /* Version 2 checksumming ignores storage class, as that
205 is really irrelevant to the linkage. */
206 remove_node($1);
207 $$ = $1;
208 }
209 | type_specifier
210 ;
211
212 storage_class_specifier:
213 AUTO_KEYW
214 | REGISTER_KEYW
215 | STATIC_KEYW
216 | EXTERN_KEYW { is_extern = 1; $$ = $1; }
217 | INLINE_KEYW { is_extern = 0; $$ = $1; }
218 ;
219
220 type_specifier:
221 simple_type_specifier
222 | cvar_qualifier
223 | TYPEOF_KEYW '(' decl_specifier_seq '*' ')'
224 | TYPEOF_KEYW '(' decl_specifier_seq ')'
225
226 /* References to s/u/e's defined elsewhere. Rearrange things
227 so that it is easier to expand the definition fully later. */
228 | STRUCT_KEYW IDENT
229 { remove_node($1); (*$2)->tag = SYM_STRUCT; $$ = $2; }
230 | UNION_KEYW IDENT
231 { remove_node($1); (*$2)->tag = SYM_UNION; $$ = $2; }
232 | ENUM_KEYW IDENT
233 { remove_node($1); (*$2)->tag = SYM_ENUM; $$ = $2; }
234
235 /* Full definitions of an s/u/e. Record it. */
236 | STRUCT_KEYW IDENT class_body
237 { record_compound($1, $2, $3, SYM_STRUCT); $$ = $3; }
238 | UNION_KEYW IDENT class_body
239 { record_compound($1, $2, $3, SYM_UNION); $$ = $3; }
240 | ENUM_KEYW IDENT enum_body
241 { record_compound($1, $2, $3, SYM_ENUM); $$ = $3; }
242 /*
243 * Anonymous enum definition. Tell add_symbol() to restart its counter.
244 */
245 | ENUM_KEYW enum_body
246 { add_symbol(NULL, SYM_ENUM, NULL, 0); $$ = $2; }
247 /* Anonymous s/u definitions. Nothing needs doing. */
248 | STRUCT_KEYW class_body { $$ = $2; }
249 | UNION_KEYW class_body { $$ = $2; }
250 ;
251
252 simple_type_specifier:
253 CHAR_KEYW
254 | SHORT_KEYW
255 | INT_KEYW
256 | LONG_KEYW
257 | SIGNED_KEYW
258 | UNSIGNED_KEYW
259 | FLOAT_KEYW
260 | DOUBLE_KEYW
261 | VOID_KEYW
262 | BOOL_KEYW
263 | TYPE { (*$1)->tag = SYM_TYPEDEF; $$ = $1; }
264 ;
265
266 ptr_operator:
267 '*' cvar_qualifier_seq_opt
268 { $$ = $2 ? $2 : $1; }
269 ;
270
271 cvar_qualifier_seq_opt:
272 /* empty */ { $$ = NULL; }
273 | cvar_qualifier_seq
274 ;
275
276 cvar_qualifier_seq:
277 cvar_qualifier
278 | cvar_qualifier_seq cvar_qualifier { $$ = $2; }
279 ;
280
281 cvar_qualifier:
282 CONST_KEYW | VOLATILE_KEYW | ATTRIBUTE_PHRASE
283 | RESTRICT_KEYW
284 { /* restrict has no effect in prototypes so ignore it */
285 remove_node($1);
286 $$ = $1;
287 }
288 ;
289
290 declarator:
291 ptr_operator declarator { $$ = $2; }
292 | direct_declarator
293 ;
294
295 direct_declarator:
296 IDENT
297 { if (current_name != NULL) {
298 error_with_pos("unexpected second declaration name");
299 YYERROR;
300 } else {
301 current_name = (*$1)->string;
302 $$ = $1;
303 }
304 }
305 | direct_declarator '(' parameter_declaration_clause ')'
306 { $$ = $4; }
307 | direct_declarator '(' error ')'
308 { $$ = $4; }
309 | direct_declarator BRACKET_PHRASE
310 { $$ = $2; }
311 | '(' declarator ')'
312 { $$ = $3; }
313 | '(' error ')'
314 { $$ = $3; }
315 ;
316
317 /* Nested declarators differ from regular declarators in that they do
318 not record the symbols they find in the global symbol table. */
319 nested_declarator:
320 ptr_operator nested_declarator { $$ = $2; }
321 | direct_nested_declarator
322 ;
323
324 direct_nested_declarator:
325 IDENT
326 | TYPE
327 | direct_nested_declarator '(' parameter_declaration_clause ')'
328 { $$ = $4; }
329 | direct_nested_declarator '(' error ')'
330 { $$ = $4; }
331 | direct_nested_declarator BRACKET_PHRASE
332 { $$ = $2; }
333 | '(' nested_declarator ')'
334 { $$ = $3; }
335 | '(' error ')'
336 { $$ = $3; }
337 ;
338
339 parameter_declaration_clause:
340 parameter_declaration_list_opt DOTS { $$ = $2; }
341 | parameter_declaration_list_opt
342 | parameter_declaration_list ',' DOTS { $$ = $3; }
343 ;
344
345 parameter_declaration_list_opt:
346 /* empty */ { $$ = NULL; }
347 | parameter_declaration_list
348 ;
349
350 parameter_declaration_list:
351 parameter_declaration
352 | parameter_declaration_list ',' parameter_declaration
353 { $$ = $3; }
354 ;
355
356 parameter_declaration:
357 decl_specifier_seq m_abstract_declarator
358 { $$ = $2 ? $2 : $1; }
359 ;
360
361 m_abstract_declarator:
362 ptr_operator m_abstract_declarator
363 { $$ = $2 ? $2 : $1; }
364 | direct_m_abstract_declarator
365 ;
366
367 direct_m_abstract_declarator:
368 /* empty */ { $$ = NULL; }
369 | IDENT
370 { /* For version 2 checksums, we don't want to remember
371 private parameter names. */
372 remove_node($1);
373 $$ = $1;
374 }
375 /* This wasn't really a typedef name but an identifier that
376 shadows one. */
377 | TYPE
378 { remove_node($1);
379 $$ = $1;
380 }
381 | direct_m_abstract_declarator '(' parameter_declaration_clause ')'
382 { $$ = $4; }
383 | direct_m_abstract_declarator '(' error ')'
384 { $$ = $4; }
385 | direct_m_abstract_declarator BRACKET_PHRASE
386 { $$ = $2; }
387 | '(' m_abstract_declarator ')'
388 { $$ = $3; }
389 | '(' error ')'
390 { $$ = $3; }
391 ;
392
393 function_definition:
394 decl_specifier_seq_opt declarator BRACE_PHRASE
395 { struct string_list *decl = *$2;
396 *$2 = NULL;
397 add_symbol(current_name, SYM_NORMAL, decl, is_extern);
398 $$ = $3;
399 }
400 ;
401
402 initializer_opt:
403 /* empty */ { $$ = NULL; }
404 | initializer
405 ;
406
407 /* We never care about the contents of an initializer. */
408 initializer:
409 '=' EXPRESSION_PHRASE
410 { remove_list($2, &(*$1)->next); $$ = $2; }
411 ;
412
413 class_body:
414 '{' member_specification_opt '}' { $$ = $3; }
415 | '{' error '}' { $$ = $3; }
416 ;
417
418 member_specification_opt:
419 /* empty */ { $$ = NULL; }
420 | member_specification
421 ;
422
423 member_specification:
424 member_declaration
425 | member_specification member_declaration { $$ = $2; }
426 ;
427
428 member_declaration:
429 decl_specifier_seq_opt member_declarator_list_opt ';'
430 { $$ = $3; }
431 | error ';'
432 { $$ = $2; }
433 ;
434
435 member_declarator_list_opt:
436 /* empty */ { $$ = NULL; }
437 | member_declarator_list
438 ;
439
440 member_declarator_list:
441 member_declarator
442 | member_declarator_list ',' member_declarator { $$ = $3; }
443 ;
444
445 member_declarator:
446 nested_declarator attribute_opt { $$ = $2 ? $2 : $1; }
447 | IDENT member_bitfield_declarator { $$ = $2; }
448 | member_bitfield_declarator
449 ;
450
451 member_bitfield_declarator:
452 ':' EXPRESSION_PHRASE { $$ = $2; }
453 ;
454
455 attribute_opt:
456 /* empty */ { $$ = NULL; }
457 | attribute_opt ATTRIBUTE_PHRASE
458 ;
459
460 enum_body:
461 '{' enumerator_list '}' { $$ = $3; }
462 | '{' enumerator_list ',' '}' { $$ = $4; }
463 ;
464
465 enumerator_list:
466 enumerator
467 | enumerator_list ',' enumerator
468
469 enumerator:
470 IDENT
471 {
472 const char *name = strdup((*$1)->string);
473 add_symbol(name, SYM_ENUM_CONST, NULL, 0);
474 }
475 | IDENT '=' EXPRESSION_PHRASE
476 {
477 const char *name = strdup((*$1)->string);
478 struct string_list *expr = copy_list_range(*$3, *$2);
479 add_symbol(name, SYM_ENUM_CONST, expr, 0);
480 }
481
482 asm_definition:
483 ASM_PHRASE ';' { $$ = $2; }
484 ;
485
486 asm_phrase_opt:
487 /* empty */ { $$ = NULL; }
488 | ASM_PHRASE
489 ;
490
491 export_definition:
492 EXPORT_SYMBOL_KEYW '(' IDENT ')' ';'
493 { export_symbol((*$3)->string); $$ = $5; }
494 ;
495
496
497 %%
498
499 static void
500 yyerror(const char *e)
501 {
502 error_with_pos("%s", e);
503 }
504