1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3 * C global declaration parser for genksyms.
4 * Copyright 1996, 1997 Linux International.
5 *
6 * New implementation contributed by Richard Henderson <rth@tamu.edu>
7 * Based on original work by Bjorn Ekwall <bj0rn@blox.se>
8 *
9 * This file is part of the Linux modutils.
10 */
11
12 %{
13
14 #include <assert.h>
15 #include <stdlib.h>
16 #include <string.h>
17 #include "genksyms.h"
18
19 static int is_typedef;
20 static int is_extern;
21 static char *current_name;
22 static struct string_list *decl_spec;
23
24 static void yyerror(const char *);
25
26 static inline void
remove_node(struct string_list ** p)27 remove_node(struct string_list **p)
28 {
29 struct string_list *node = *p;
30 *p = node->next;
31 free_node(node);
32 }
33
34 static inline void
remove_list(struct string_list ** pb,struct string_list ** pe)35 remove_list(struct string_list **pb, struct string_list **pe)
36 {
37 struct string_list *b = *pb, *e = *pe;
38 *pb = e;
39 free_list(b, e);
40 }
41
42 /* 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)43 static void record_compound(struct string_list **keyw,
44 struct string_list **ident,
45 struct string_list **body,
46 enum symbol_type type)
47 {
48 struct string_list *b = *body, *i = *ident, *r;
49
50 if (i->in_source_file) {
51 remove_node(keyw);
52 (*ident)->tag = type;
53 remove_list(body, ident);
54 return;
55 }
56 r = copy_node(i); r->tag = type;
57 r->next = (*keyw)->next; *body = r; (*keyw)->next = NULL;
58 add_symbol(i->string, type, b, is_extern);
59 }
60
61 %}
62
63 %token ASM_KEYW
64 %token ATTRIBUTE_KEYW
65 %token AUTO_KEYW
66 %token BOOL_KEYW
67 %token BUILTIN_INT_KEYW
68 %token CHAR_KEYW
69 %token CONST_KEYW
70 %token DOUBLE_KEYW
71 %token ENUM_KEYW
72 %token EXTERN_KEYW
73 %token EXTENSION_KEYW
74 %token FLOAT_KEYW
75 %token INLINE_KEYW
76 %token INT_KEYW
77 %token LONG_KEYW
78 %token REGISTER_KEYW
79 %token RESTRICT_KEYW
80 %token SHORT_KEYW
81 %token SIGNED_KEYW
82 %token STATIC_KEYW
83 %token STRUCT_KEYW
84 %token TYPEDEF_KEYW
85 %token UNION_KEYW
86 %token UNSIGNED_KEYW
87 %token VOID_KEYW
88 %token VOLATILE_KEYW
89 %token TYPEOF_KEYW
90 %token VA_LIST_KEYW
91
92 %token EXPORT_SYMBOL_KEYW
93
94 %token ASM_PHRASE
95 %token ATTRIBUTE_PHRASE
96 %token TYPEOF_PHRASE
97 %token BRACE_PHRASE
98 %token BRACKET_PHRASE
99 %token EXPRESSION_PHRASE
100
101 %token CHAR
102 %token DOTS
103 %token IDENT
104 %token INT
105 %token REAL
106 %token STRING
107 %token TYPE
108 %token OTHER
109 %token FILENAME
110
111 %%
112
113 declaration_seq:
114 declaration
115 | declaration_seq declaration
116 ;
117
118 declaration:
119 { is_typedef = 0; is_extern = 0; current_name = NULL; decl_spec = NULL; }
120 declaration1
121 { free_list(*$2, NULL); *$2 = NULL; }
122 ;
123
124 declaration1:
125 EXTENSION_KEYW TYPEDEF_KEYW { is_typedef = 1; } simple_declaration
126 { $$ = $4; }
127 | TYPEDEF_KEYW { is_typedef = 1; } simple_declaration
128 { $$ = $3; }
129 | simple_declaration
130 | function_definition
131 | asm_definition
132 | export_definition
133 | error ';' { $$ = $2; }
134 | error '}' { $$ = $2; }
135 ;
136
137 simple_declaration:
138 decl_specifier_seq_opt init_declarator_list_opt ';'
139 { if (current_name) {
140 struct string_list *decl = (*$3)->next;
141 (*$3)->next = NULL;
142 add_symbol(current_name,
143 is_typedef ? SYM_TYPEDEF : SYM_NORMAL,
144 decl, is_extern);
145 current_name = NULL;
146 }
147 $$ = $3;
148 }
149 ;
150
151 init_declarator_list_opt:
152 /* empty */ { $$ = NULL; }
153 | init_declarator_list
154 ;
155
156 init_declarator_list:
157 init_declarator
158 { struct string_list *decl = *$1;
159 *$1 = NULL;
160 add_symbol(current_name,
161 is_typedef ? SYM_TYPEDEF : SYM_NORMAL, decl, is_extern);
162 current_name = NULL;
163 $$ = $1;
164 }
165 | init_declarator_list ',' init_declarator
166 { struct string_list *decl = *$3;
167 *$3 = NULL;
168 free_list(*$2, NULL);
169 *$2 = decl_spec;
170 add_symbol(current_name,
171 is_typedef ? SYM_TYPEDEF : SYM_NORMAL, decl, is_extern);
172 current_name = NULL;
173 $$ = $3;
174 }
175 ;
176
177 init_declarator:
178 declarator asm_phrase_opt attribute_opt initializer_opt
179 { $$ = $4 ? $4 : $3 ? $3 : $2 ? $2 : $1; }
180 ;
181
182 /* Hang on to the specifiers so that we can reuse them. */
183 decl_specifier_seq_opt:
184 /* empty */ { decl_spec = NULL; }
185 | decl_specifier_seq
186 ;
187
188 decl_specifier_seq:
189 decl_specifier { decl_spec = *$1; }
190 | decl_specifier_seq decl_specifier { decl_spec = *$2; }
191 ;
192
193 decl_specifier:
194 storage_class_specifier
195 { /* Version 2 checksumming ignores storage class, as that
196 is really irrelevant to the linkage. */
197 remove_node($1);
198 $$ = $1;
199 }
200 | type_specifier
201 ;
202
203 storage_class_specifier:
204 AUTO_KEYW
205 | REGISTER_KEYW
206 | STATIC_KEYW
207 | EXTERN_KEYW { is_extern = 1; $$ = $1; }
208 | INLINE_KEYW { is_extern = 0; $$ = $1; }
209 ;
210
211 type_specifier:
212 simple_type_specifier
213 | cvar_qualifier
214 | TYPEOF_KEYW '(' parameter_declaration ')'
215 | TYPEOF_PHRASE
216
217 /* References to s/u/e's defined elsewhere. Rearrange things
218 so that it is easier to expand the definition fully later. */
219 | STRUCT_KEYW IDENT
220 { remove_node($1); (*$2)->tag = SYM_STRUCT; $$ = $2; }
221 | UNION_KEYW IDENT
222 { remove_node($1); (*$2)->tag = SYM_UNION; $$ = $2; }
223 | ENUM_KEYW IDENT
224 { remove_node($1); (*$2)->tag = SYM_ENUM; $$ = $2; }
225
226 /* Full definitions of an s/u/e. Record it. */
227 | STRUCT_KEYW IDENT class_body
228 { record_compound($1, $2, $3, SYM_STRUCT); $$ = $3; }
229 | UNION_KEYW IDENT class_body
230 { record_compound($1, $2, $3, SYM_UNION); $$ = $3; }
231 | ENUM_KEYW IDENT enum_body
232 { record_compound($1, $2, $3, SYM_ENUM); $$ = $3; }
233 /*
234 * Anonymous enum definition. Tell add_symbol() to restart its counter.
235 */
236 | ENUM_KEYW enum_body
237 { add_symbol(NULL, SYM_ENUM, NULL, 0); $$ = $2; }
238 /* Anonymous s/u definitions. Nothing needs doing. */
239 | STRUCT_KEYW class_body { $$ = $2; }
240 | UNION_KEYW class_body { $$ = $2; }
241 ;
242
243 simple_type_specifier:
244 CHAR_KEYW
245 | SHORT_KEYW
246 | INT_KEYW
247 | LONG_KEYW
248 | SIGNED_KEYW
249 | UNSIGNED_KEYW
250 | FLOAT_KEYW
251 | DOUBLE_KEYW
252 | VOID_KEYW
253 | BOOL_KEYW
254 | VA_LIST_KEYW
255 | BUILTIN_INT_KEYW
256 | TYPE { (*$1)->tag = SYM_TYPEDEF; $$ = $1; }
257 ;
258
259 ptr_operator:
260 '*' cvar_qualifier_seq_opt
261 { $$ = $2 ? $2 : $1; }
262 ;
263
264 cvar_qualifier_seq_opt:
265 /* empty */ { $$ = NULL; }
266 | cvar_qualifier_seq
267 ;
268
269 cvar_qualifier_seq:
270 cvar_qualifier
271 | cvar_qualifier_seq cvar_qualifier { $$ = $2; }
272 ;
273
274 cvar_qualifier:
275 CONST_KEYW | VOLATILE_KEYW | ATTRIBUTE_PHRASE
276 | RESTRICT_KEYW
277 { /* restrict has no effect in prototypes so ignore it */
278 remove_node($1);
279 $$ = $1;
280 }
281 ;
282
283 declarator:
284 ptr_operator declarator { $$ = $2; }
285 | direct_declarator
286 ;
287
288 direct_declarator:
289 IDENT
290 { if (current_name != NULL) {
291 error_with_pos("unexpected second declaration name");
292 YYERROR;
293 } else {
294 current_name = (*$1)->string;
295 $$ = $1;
296 }
297 }
298 | TYPE
299 { if (current_name != NULL) {
300 error_with_pos("unexpected second declaration name");
301 YYERROR;
302 } else {
303 current_name = (*$1)->string;
304 $$ = $1;
305 }
306 }
307 | direct_declarator '(' parameter_declaration_clause ')'
308 { $$ = $4; }
309 | direct_declarator '(' error ')'
310 { $$ = $4; }
311 | direct_declarator BRACKET_PHRASE
312 { $$ = $2; }
313 | '(' declarator ')'
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