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1da177e4 LT |
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; $$ = $1; } | |
195 | ; | |
196 | ||
197 | type_specifier: | |
198 | simple_type_specifier | |
199 | | cvar_qualifier | |
a89a0a23 | 200 | | TYPEOF_KEYW '(' decl_specifier_seq '*' ')' |
1da177e4 LT |
201 | | TYPEOF_KEYW '(' decl_specifier_seq ')' |
202 | ||
203 | /* References to s/u/e's defined elsewhere. Rearrange things | |
204 | so that it is easier to expand the definition fully later. */ | |
205 | | STRUCT_KEYW IDENT | |
206 | { remove_node($1); (*$2)->tag = SYM_STRUCT; $$ = $2; } | |
207 | | UNION_KEYW IDENT | |
208 | { remove_node($1); (*$2)->tag = SYM_UNION; $$ = $2; } | |
209 | | ENUM_KEYW IDENT | |
210 | { remove_node($1); (*$2)->tag = SYM_ENUM; $$ = $2; } | |
211 | ||
212 | /* Full definitions of an s/u/e. Record it. */ | |
213 | | STRUCT_KEYW IDENT class_body | |
214 | { struct string_list *s = *$3, *i = *$2, *r; | |
215 | r = copy_node(i); r->tag = SYM_STRUCT; | |
216 | r->next = (*$1)->next; *$3 = r; (*$1)->next = NULL; | |
217 | add_symbol(i->string, SYM_STRUCT, s, is_extern); | |
218 | $$ = $3; | |
219 | } | |
220 | | UNION_KEYW IDENT class_body | |
221 | { struct string_list *s = *$3, *i = *$2, *r; | |
222 | r = copy_node(i); r->tag = SYM_UNION; | |
223 | r->next = (*$1)->next; *$3 = r; (*$1)->next = NULL; | |
224 | add_symbol(i->string, SYM_UNION, s, is_extern); | |
225 | $$ = $3; | |
226 | } | |
227 | | ENUM_KEYW IDENT BRACE_PHRASE | |
228 | { struct string_list *s = *$3, *i = *$2, *r; | |
229 | r = copy_node(i); r->tag = SYM_ENUM; | |
230 | r->next = (*$1)->next; *$3 = r; (*$1)->next = NULL; | |
231 | add_symbol(i->string, SYM_ENUM, s, is_extern); | |
232 | $$ = $3; | |
233 | } | |
234 | ||
235 | /* Anonymous s/u/e definitions. Nothing needs doing. */ | |
236 | | ENUM_KEYW BRACE_PHRASE { $$ = $2; } | |
237 | | STRUCT_KEYW class_body { $$ = $2; } | |
238 | | UNION_KEYW class_body { $$ = $2; } | |
239 | ; | |
240 | ||
241 | simple_type_specifier: | |
242 | CHAR_KEYW | |
243 | | SHORT_KEYW | |
244 | | INT_KEYW | |
245 | | LONG_KEYW | |
246 | | SIGNED_KEYW | |
247 | | UNSIGNED_KEYW | |
248 | | FLOAT_KEYW | |
249 | | DOUBLE_KEYW | |
250 | | VOID_KEYW | |
251 | | BOOL_KEYW | |
252 | | TYPE { (*$1)->tag = SYM_TYPEDEF; $$ = $1; } | |
253 | ; | |
254 | ||
255 | ptr_operator: | |
256 | '*' cvar_qualifier_seq_opt | |
257 | { $$ = $2 ? $2 : $1; } | |
258 | ; | |
259 | ||
260 | cvar_qualifier_seq_opt: | |
261 | /* empty */ { $$ = NULL; } | |
262 | | cvar_qualifier_seq | |
263 | ; | |
264 | ||
265 | cvar_qualifier_seq: | |
266 | cvar_qualifier | |
267 | | cvar_qualifier_seq cvar_qualifier { $$ = $2; } | |
268 | ; | |
269 | ||
270 | cvar_qualifier: | |
271 | CONST_KEYW | VOLATILE_KEYW | ATTRIBUTE_PHRASE | |
272 | | RESTRICT_KEYW | |
273 | { /* restrict has no effect in prototypes so ignore it */ | |
274 | remove_node($1); | |
275 | $$ = $1; | |
276 | } | |
277 | ; | |
278 | ||
279 | declarator: | |
280 | ptr_operator declarator { $$ = $2; } | |
281 | | direct_declarator | |
282 | ; | |
283 | ||
284 | direct_declarator: | |
285 | IDENT | |
286 | { if (current_name != NULL) { | |
287 | error_with_pos("unexpected second declaration name"); | |
288 | YYERROR; | |
289 | } else { | |
290 | current_name = (*$1)->string; | |
291 | $$ = $1; | |
292 | } | |
293 | } | |
294 | | direct_declarator '(' parameter_declaration_clause ')' | |
295 | { $$ = $4; } | |
296 | | direct_declarator '(' error ')' | |
297 | { $$ = $4; } | |
298 | | direct_declarator BRACKET_PHRASE | |
299 | { $$ = $2; } | |
300 | | '(' declarator ')' | |
301 | { $$ = $3; } | |
302 | | '(' error ')' | |
303 | { $$ = $3; } | |
304 | ; | |
305 | ||
306 | /* Nested declarators differ from regular declarators in that they do | |
307 | not record the symbols they find in the global symbol table. */ | |
308 | nested_declarator: | |
309 | ptr_operator nested_declarator { $$ = $2; } | |
310 | | direct_nested_declarator | |
311 | ; | |
312 | ||
313 | direct_nested_declarator: | |
314 | IDENT | |
315 | | TYPE | |
316 | | direct_nested_declarator '(' parameter_declaration_clause ')' | |
317 | { $$ = $4; } | |
318 | | direct_nested_declarator '(' error ')' | |
319 | { $$ = $4; } | |
320 | | direct_nested_declarator BRACKET_PHRASE | |
321 | { $$ = $2; } | |
322 | | '(' nested_declarator ')' | |
323 | { $$ = $3; } | |
324 | | '(' error ')' | |
325 | { $$ = $3; } | |
326 | ; | |
327 | ||
328 | parameter_declaration_clause: | |
329 | parameter_declaration_list_opt DOTS { $$ = $2; } | |
330 | | parameter_declaration_list_opt | |
331 | | parameter_declaration_list ',' DOTS { $$ = $3; } | |
332 | ; | |
333 | ||
334 | parameter_declaration_list_opt: | |
335 | /* empty */ { $$ = NULL; } | |
336 | | parameter_declaration_list | |
337 | ; | |
338 | ||
339 | parameter_declaration_list: | |
340 | parameter_declaration | |
341 | | parameter_declaration_list ',' parameter_declaration | |
342 | { $$ = $3; } | |
343 | ; | |
344 | ||
345 | parameter_declaration: | |
346 | decl_specifier_seq m_abstract_declarator | |
347 | { $$ = $2 ? $2 : $1; } | |
348 | ; | |
349 | ||
350 | m_abstract_declarator: | |
351 | ptr_operator m_abstract_declarator | |
352 | { $$ = $2 ? $2 : $1; } | |
353 | | direct_m_abstract_declarator | |
354 | ; | |
355 | ||
356 | direct_m_abstract_declarator: | |
357 | /* empty */ { $$ = NULL; } | |
358 | | IDENT | |
359 | { /* For version 2 checksums, we don't want to remember | |
360 | private parameter names. */ | |
361 | remove_node($1); | |
362 | $$ = $1; | |
363 | } | |
364 | /* This wasn't really a typedef name but an identifier that | |
365 | shadows one. */ | |
366 | | TYPE | |
367 | { remove_node($1); | |
368 | $$ = $1; | |
369 | } | |
370 | | direct_m_abstract_declarator '(' parameter_declaration_clause ')' | |
371 | { $$ = $4; } | |
372 | | direct_m_abstract_declarator '(' error ')' | |
373 | { $$ = $4; } | |
374 | | direct_m_abstract_declarator BRACKET_PHRASE | |
375 | { $$ = $2; } | |
376 | | '(' m_abstract_declarator ')' | |
377 | { $$ = $3; } | |
378 | | '(' error ')' | |
379 | { $$ = $3; } | |
380 | ; | |
381 | ||
382 | function_definition: | |
383 | decl_specifier_seq_opt declarator BRACE_PHRASE | |
384 | { struct string_list *decl = *$2; | |
385 | *$2 = NULL; | |
386 | add_symbol(current_name, SYM_NORMAL, decl, is_extern); | |
387 | $$ = $3; | |
388 | } | |
389 | ; | |
390 | ||
391 | initializer_opt: | |
392 | /* empty */ { $$ = NULL; } | |
393 | | initializer | |
394 | ; | |
395 | ||
396 | /* We never care about the contents of an initializer. */ | |
397 | initializer: | |
398 | '=' EXPRESSION_PHRASE | |
399 | { remove_list($2, &(*$1)->next); $$ = $2; } | |
400 | ; | |
401 | ||
402 | class_body: | |
403 | '{' member_specification_opt '}' { $$ = $3; } | |
404 | | '{' error '}' { $$ = $3; } | |
405 | ; | |
406 | ||
407 | member_specification_opt: | |
408 | /* empty */ { $$ = NULL; } | |
409 | | member_specification | |
410 | ; | |
411 | ||
412 | member_specification: | |
413 | member_declaration | |
414 | | member_specification member_declaration { $$ = $2; } | |
415 | ; | |
416 | ||
417 | member_declaration: | |
418 | decl_specifier_seq_opt member_declarator_list_opt ';' | |
419 | { $$ = $3; } | |
420 | | error ';' | |
421 | { $$ = $2; } | |
422 | ; | |
423 | ||
424 | member_declarator_list_opt: | |
425 | /* empty */ { $$ = NULL; } | |
426 | | member_declarator_list | |
427 | ; | |
428 | ||
429 | member_declarator_list: | |
430 | member_declarator | |
431 | | member_declarator_list ',' member_declarator { $$ = $3; } | |
432 | ; | |
433 | ||
434 | member_declarator: | |
435 | nested_declarator attribute_opt { $$ = $2 ? $2 : $1; } | |
436 | | IDENT member_bitfield_declarator { $$ = $2; } | |
437 | | member_bitfield_declarator | |
438 | ; | |
439 | ||
440 | member_bitfield_declarator: | |
441 | ':' EXPRESSION_PHRASE { $$ = $2; } | |
442 | ; | |
443 | ||
444 | attribute_opt: | |
445 | /* empty */ { $$ = NULL; } | |
446 | | ATTRIBUTE_PHRASE | |
447 | ; | |
448 | ||
449 | asm_definition: | |
450 | ASM_PHRASE ';' { $$ = $2; } | |
451 | ; | |
452 | ||
453 | asm_phrase_opt: | |
454 | /* empty */ { $$ = NULL; } | |
455 | | ASM_PHRASE | |
456 | ; | |
457 | ||
458 | export_definition: | |
459 | EXPORT_SYMBOL_KEYW '(' IDENT ')' ';' | |
460 | { export_symbol((*$3)->string); $$ = $5; } | |
461 | ; | |
462 | ||
463 | ||
464 | %% | |
465 | ||
466 | static void | |
467 | yyerror(const char *e) | |
468 | { | |
469 | error_with_pos("%s", e); | |
470 | } |