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 STATIC_ASSERT_KEYW
84 %token STRUCT_KEYW
85 %token TYPEDEF_KEYW
86 %token UNION_KEYW
87 %token UNSIGNED_KEYW
88 %token VOID_KEYW
89 %token VOLATILE_KEYW
90 %token TYPEOF_KEYW
91 %token VA_LIST_KEYW
92
93 %token EXPORT_SYMBOL_KEYW
94
95 %token ASM_PHRASE
96 %token ATTRIBUTE_PHRASE
97 %token TYPEOF_PHRASE
98 %token BRACE_PHRASE
99 %token BRACKET_PHRASE
100 %token EXPRESSION_PHRASE
101 %token STATIC_ASSERT_PHRASE
102
103 %token CHAR
104 %token DOTS
105 %token IDENT
106 %token INT
107 %token REAL
108 %token STRING
109 %token TYPE
110 %token OTHER
111 %token FILENAME
112
113 %%
114
115 declaration_seq:
116 declaration
117 | declaration_seq declaration
118 ;
119
120 declaration:
121 { is_typedef = 0; is_extern = 0; current_name = NULL; decl_spec = NULL; }
122 declaration1
123 { free_list(*$2, NULL); *$2 = NULL; }
124 ;
125
126 declaration1:
127 EXTENSION_KEYW TYPEDEF_KEYW { is_typedef = 1; } simple_declaration
128 { $$ = $4; }
129 | TYPEDEF_KEYW { is_typedef = 1; } simple_declaration
130 { $$ = $3; }
131 | simple_declaration
132 | function_definition
133 | asm_definition
134 | export_definition
135 | static_assert
136 | error ';' { $$ = $2; }
137 | error '}' { $$ = $2; }
138 ;
139
140 simple_declaration:
141 decl_specifier_seq_opt init_declarator_list_opt ';'
142 { if (current_name) {
143 struct string_list *decl = (*$3)->next;
144 (*$3)->next = NULL;
145 add_symbol(current_name,
146 is_typedef ? SYM_TYPEDEF : SYM_NORMAL,
147 decl, is_extern);
148 current_name = NULL;
149 }
150 $$ = $3;
151 }
152 ;
153
154 init_declarator_list_opt:
155 /* empty */ { $$ = NULL; }
156 | init_declarator_list
157 ;
158
159 init_declarator_list:
160 init_declarator
161 { struct string_list *decl = *$1;
162 *$1 = NULL;
163 add_symbol(current_name,
164 is_typedef ? SYM_TYPEDEF : SYM_NORMAL, decl, is_extern);
165 current_name = NULL;
166 $$ = $1;
167 }
168 | init_declarator_list ',' init_declarator
169 { struct string_list *decl = *$3;
170 *$3 = NULL;
171 free_list(*$2, NULL);
172 *$2 = decl_spec;
173 add_symbol(current_name,
174 is_typedef ? SYM_TYPEDEF : SYM_NORMAL, decl, is_extern);
175 current_name = NULL;
176 $$ = $3;
177 }
178 ;
179
180 init_declarator:
181 declarator asm_phrase_opt attribute_opt initializer_opt
182 { $$ = $4 ? $4 : $3 ? $3 : $2 ? $2 : $1; }
183 ;
184
185 /* Hang on to the specifiers so that we can reuse them. */
186 decl_specifier_seq_opt:
187 /* empty */ { decl_spec = NULL; }
188 | decl_specifier_seq
189 ;
190
191 decl_specifier_seq:
192 decl_specifier { decl_spec = *$1; }
193 | decl_specifier_seq decl_specifier { decl_spec = *$2; }
194 ;
195
196 decl_specifier:
197 storage_class_specifier
198 { /* Version 2 checksumming ignores storage class, as that
199 is really irrelevant to the linkage. */
200 remove_node($1);
201 $$ = $1;
202 }
203 | type_specifier
204 ;
205
206 storage_class_specifier:
207 AUTO_KEYW
208 | REGISTER_KEYW
209 | STATIC_KEYW
210 | EXTERN_KEYW { is_extern = 1; $$ = $1; }
211 | INLINE_KEYW { is_extern = 0; $$ = $1; }
212 ;
213
214 type_specifier:
215 simple_type_specifier
216 | cvar_qualifier
217 | TYPEOF_KEYW '(' parameter_declaration ')'
218 | TYPEOF_PHRASE
219
220 /* References to s/u/e's defined elsewhere. Rearrange things
221 so that it is easier to expand the definition fully later. */
222 | STRUCT_KEYW IDENT
223 { remove_node($1); (*$2)->tag = SYM_STRUCT; $$ = $2; }
224 | UNION_KEYW IDENT
225 { remove_node($1); (*$2)->tag = SYM_UNION; $$ = $2; }
226 | ENUM_KEYW IDENT
227 { remove_node($1); (*$2)->tag = SYM_ENUM; $$ = $2; }
228
229 /* Full definitions of an s/u/e. Record it. */
230 | STRUCT_KEYW IDENT class_body
231 { record_compound($1, $2, $3, SYM_STRUCT); $$ = $3; }
232 | UNION_KEYW IDENT class_body
233 { record_compound($1, $2, $3, SYM_UNION); $$ = $3; }
234 | ENUM_KEYW IDENT enum_body
235 { record_compound($1, $2, $3, SYM_ENUM); $$ = $3; }
236 /*
237 * Anonymous enum definition. Tell add_symbol() to restart its counter.
238 */
239 | ENUM_KEYW enum_body
240 { add_symbol(NULL, SYM_ENUM, NULL, 0); $$ = $2; }
241 /* Anonymous s/u definitions. Nothing needs doing. */
242 | STRUCT_KEYW class_body { $$ = $2; }
243 | UNION_KEYW class_body { $$ = $2; }
244 ;
245
246 simple_type_specifier:
247 CHAR_KEYW
248 | SHORT_KEYW
249 | INT_KEYW
250 | LONG_KEYW
251 | SIGNED_KEYW
252 | UNSIGNED_KEYW
253 | FLOAT_KEYW
254 | DOUBLE_KEYW
255 | VOID_KEYW
256 | BOOL_KEYW
257 | VA_LIST_KEYW
258 | BUILTIN_INT_KEYW
259 | TYPE { (*$1)->tag = SYM_TYPEDEF; $$ = $1; }
260 ;
261
262 ptr_operator:
263 '*' cvar_qualifier_seq_opt
264 { $$ = $2 ? $2 : $1; }
265 ;
266
267 cvar_qualifier_seq_opt:
268 /* empty */ { $$ = NULL; }
269 | cvar_qualifier_seq
270 ;
271
272 cvar_qualifier_seq:
273 cvar_qualifier
274 | cvar_qualifier_seq cvar_qualifier { $$ = $2; }
275 ;
276
277 cvar_qualifier:
278 CONST_KEYW | VOLATILE_KEYW | ATTRIBUTE_PHRASE
279 | RESTRICT_KEYW
280 { /* restrict has no effect in prototypes so ignore it */
281 remove_node($1);
282 $$ = $1;
283 }
284 ;
285
286 declarator:
287 ptr_operator declarator { $$ = $2; }
288 | direct_declarator
289 ;
290
291 direct_declarator:
292 IDENT
293 { if (current_name != NULL) {
294 error_with_pos("unexpected second declaration name");
295 YYERROR;
296 } else {
297 current_name = (*$1)->string;
298 $$ = $1;
299 }
300 }
301 | TYPE
302 { if (current_name != NULL) {
303 error_with_pos("unexpected second declaration name");
304 YYERROR;
305 } else {
306 current_name = (*$1)->string;
307 $$ = $1;
308 }
309 }
310 | direct_declarator '(' parameter_declaration_clause ')'
311 { $$ = $4; }
312 | direct_declarator '(' error ')'
313 { $$ = $4; }
314 | direct_declarator BRACKET_PHRASE
315 { $$ = $2; }
316 | '(' declarator ')'
317 { $$ = $3; }
318 ;
319
320 /* Nested declarators differ from regular declarators in that they do
321 not record the symbols they find in the global symbol table. */
322 nested_declarator:
323 ptr_operator nested_declarator { $$ = $2; }
324 | direct_nested_declarator
325 ;
326
327 direct_nested_declarator:
328 IDENT
329 | TYPE
330 | direct_nested_declarator '(' parameter_declaration_clause ')'
331 { $$ = $4; }
332 | direct_nested_declarator '(' error ')'
333 { $$ = $4; }
334 | direct_nested_declarator BRACKET_PHRASE
335 { $$ = $2; }
336 | '(' nested_declarator ')'
337 { $$ = $3; }
338 | '(' error ')'
339 { $$ = $3; }
340 ;
341
342 parameter_declaration_clause:
343 parameter_declaration_list_opt DOTS { $$ = $2; }
344 | parameter_declaration_list_opt
345 | parameter_declaration_list ',' DOTS { $$ = $3; }
346 ;
347
348 parameter_declaration_list_opt:
349 /* empty */ { $$ = NULL; }
350 | parameter_declaration_list
351 ;
352
353 parameter_declaration_list:
354 parameter_declaration
355 | parameter_declaration_list ',' parameter_declaration
356 { $$ = $3; }
357 ;
358
359 parameter_declaration:
360 decl_specifier_seq m_abstract_declarator
361 { $$ = $2 ? $2 : $1; }
362 ;
363
364 m_abstract_declarator:
365 ptr_operator m_abstract_declarator
366 { $$ = $2 ? $2 : $1; }
367 | direct_m_abstract_declarator
368 ;
369
370 direct_m_abstract_declarator:
371 /* empty */ { $$ = NULL; }
372 | IDENT
373 { /* For version 2 checksums, we don't want to remember
374 private parameter names. */
375 remove_node($1);
376 $$ = $1;
377 }
378 /* This wasn't really a typedef name but an identifier that
379 shadows one. */
380 | TYPE
381 { remove_node($1);
382 $$ = $1;
383 }
384 | direct_m_abstract_declarator '(' parameter_declaration_clause ')'
385 { $$ = $4; }
386 | direct_m_abstract_declarator '(' error ')'
387 { $$ = $4; }
388 | direct_m_abstract_declarator BRACKET_PHRASE
389 { $$ = $2; }
390 | '(' m_abstract_declarator ')'
391 { $$ = $3; }
392 | '(' error ')'
393 { $$ = $3; }
394 ;
395
396 function_definition:
397 decl_specifier_seq_opt declarator BRACE_PHRASE
398 { struct string_list *decl = *$2;
399 *$2 = NULL;
400 add_symbol(current_name, SYM_NORMAL, decl, is_extern);
401 $$ = $3;
402 }
403 ;
404
405 initializer_opt:
406 /* empty */ { $$ = NULL; }
407 | initializer
408 ;
409
410 /* We never care about the contents of an initializer. */
411 initializer:
412 '=' EXPRESSION_PHRASE
413 { remove_list($2, &(*$1)->next); $$ = $2; }
414 ;
415
416 class_body:
417 '{' member_specification_opt '}' { $$ = $3; }
418 | '{' error '}' { $$ = $3; }
419 ;
420
421 member_specification_opt:
422 /* empty */ { $$ = NULL; }
423 | member_specification
424 ;
425
426 member_specification:
427 member_declaration
428 | member_specification member_declaration { $$ = $2; }
429 ;
430
431 member_declaration:
432 decl_specifier_seq_opt member_declarator_list_opt ';'
433 { $$ = $3; }
434 | error ';'
435 { $$ = $2; }
436 ;
437
438 member_declarator_list_opt:
439 /* empty */ { $$ = NULL; }
440 | member_declarator_list
441 ;
442
443 member_declarator_list:
444 member_declarator
445 | member_declarator_list ',' member_declarator { $$ = $3; }
446 ;
447
448 member_declarator:
449 nested_declarator attribute_opt { $$ = $2 ? $2 : $1; }
450 | IDENT member_bitfield_declarator { $$ = $2; }
451 | member_bitfield_declarator
452 ;
453
454 member_bitfield_declarator:
455 ':' EXPRESSION_PHRASE { $$ = $2; }
456 ;
457
458 attribute_opt:
459 /* empty */ { $$ = NULL; }
460 | attribute_opt ATTRIBUTE_PHRASE
461 ;
462
463 enum_body:
464 '{' enumerator_list '}' { $$ = $3; }
465 | '{' enumerator_list ',' '}' { $$ = $4; }
466 ;
467
468 enumerator_list:
469 enumerator
470 | enumerator_list ',' enumerator
471
472 enumerator:
473 IDENT
474 {
475 const char *name = strdup((*$1)->string);
476 add_symbol(name, SYM_ENUM_CONST, NULL, 0);
477 }
478 | IDENT '=' EXPRESSION_PHRASE
479 {
480 const char *name = strdup((*$1)->string);
481 struct string_list *expr = copy_list_range(*$3, *$2);
482 add_symbol(name, SYM_ENUM_CONST, expr, 0);
483 }
484
485 asm_definition:
486 ASM_PHRASE ';' { $$ = $2; }
487 ;
488
489 asm_phrase_opt:
490 /* empty */ { $$ = NULL; }
491 | ASM_PHRASE
492 ;
493
494 export_definition:
495 EXPORT_SYMBOL_KEYW '(' IDENT ')' ';'
496 { export_symbol((*$3)->string); $$ = $5; }
497 ;
498
499 /* Ignore any module scoped _Static_assert(...) */
500 static_assert:
501 STATIC_ASSERT_PHRASE ';' { $$ = $2; }
502 ;
503
504 %%
505
506 static void
507 yyerror(const char *e)
508 {
509 error_with_pos("%s", e);
510 }
511