aboutsummaryrefslogtreecommitdiffstats
path: root/scripts/genksyms/parse.y
diff options
context:
space:
mode:
Diffstat (limited to 'scripts/genksyms/parse.y')
-rw-r--r--scripts/genksyms/parse.y469
1 files changed, 469 insertions, 0 deletions
diff --git a/scripts/genksyms/parse.y b/scripts/genksyms/parse.y
new file mode 100644
index 000000000000..099043713db4
--- /dev/null
+++ b/scripts/genksyms/parse.y
@@ -0,0 +1,469 @@
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
30static int is_typedef;
31static int is_extern;
32static char *current_name;
33static struct string_list *decl_spec;
34
35static void yyerror(const char *);
36
37static inline void
38remove_node(struct string_list **p)
39{
40 struct string_list *node = *p;
41 *p = node->next;
42 free_node(node);
43}
44
45static inline void
46remove_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
101declaration_seq:
102 declaration
103 | declaration_seq declaration
104 ;
105
106declaration:
107 { is_typedef = 0; is_extern = 0; current_name = NULL; decl_spec = NULL; }
108 declaration1
109 { free_list(*$2, NULL); *$2 = NULL; }
110 ;
111
112declaration1:
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 '}' { $$ = $2; }
121 ;
122
123simple_declaration:
124 decl_specifier_seq_opt init_declarator_list_opt ';'
125 { if (current_name) {
126 struct string_list *decl = (*$3)->next;
127 (*$3)->next = NULL;
128 add_symbol(current_name,
129 is_typedef ? SYM_TYPEDEF : SYM_NORMAL,
130 decl, is_extern);
131 current_name = NULL;
132 }
133 $$ = $3;
134 }
135 ;
136
137init_declarator_list_opt:
138 /* empty */ { $$ = NULL; }
139 | init_declarator_list
140 ;
141
142init_declarator_list:
143 init_declarator
144 { struct string_list *decl = *$1;
145 *$1 = NULL;
146 add_symbol(current_name,
147 is_typedef ? SYM_TYPEDEF : SYM_NORMAL, decl, is_extern);
148 current_name = NULL;
149 $$ = $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 $$ = $3;
160 }
161 ;
162
163init_declarator:
164 declarator asm_phrase_opt attribute_opt initializer_opt
165 { $$ = $4 ? $4 : $3 ? $3 : $2 ? $2 : $1; }
166 ;
167
168/* Hang on to the specifiers so that we can reuse them. */
169decl_specifier_seq_opt:
170 /* empty */ { decl_spec = NULL; }
171 | decl_specifier_seq
172 ;
173
174decl_specifier_seq:
175 decl_specifier { decl_spec = *$1; }
176 | decl_specifier_seq decl_specifier { decl_spec = *$2; }
177 ;
178
179decl_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 $$ = $1;
185 }
186 | type_specifier
187 ;
188
189storage_class_specifier:
190 AUTO_KEYW
191 | REGISTER_KEYW
192 | STATIC_KEYW
193 | EXTERN_KEYW { is_extern = 1; $$ = $1; }
194 | INLINE_KEYW { is_extern = 0; $$ = $1; }
195 ;
196
197type_specifier:
198 simple_type_specifier
199 | cvar_qualifier
200 | TYPEOF_KEYW '(' decl_specifier_seq ')'
201
202 /* References to s/u/e's defined elsewhere. Rearrange things
203 so that it is easier to expand the definition fully later. */
204 | STRUCT_KEYW IDENT
205 { remove_node($1); (*$2)->tag = SYM_STRUCT; $$ = $2; }
206 | UNION_KEYW IDENT
207 { remove_node($1); (*$2)->tag = SYM_UNION; $$ = $2; }
208 | ENUM_KEYW IDENT
209 { remove_node($1); (*$2)->tag = SYM_ENUM; $$ = $2; }
210
211 /* Full definitions of an s/u/e. Record it. */
212 | STRUCT_KEYW IDENT class_body
213 { struct string_list *s = *$3, *i = *$2, *r;
214 r = copy_node(i); r->tag = SYM_STRUCT;
215 r->next = (*$1)->next; *$3 = r; (*$1)->next = NULL;
216 add_symbol(i->string, SYM_STRUCT, s, is_extern);
217 $$ = $3;
218 }
219 | UNION_KEYW IDENT class_body
220 { struct string_list *s = *$3, *i = *$2, *r;
221 r = copy_node(i); r->tag = SYM_UNION;
222 r->next = (*$1)->next; *$3 = r; (*$1)->next = NULL;
223 add_symbol(i->string, SYM_UNION, s, is_extern);
224 $$ = $3;
225 }
226 | ENUM_KEYW IDENT BRACE_PHRASE
227 { struct string_list *s = *$3, *i = *$2, *r;
228 r = copy_node(i); r->tag = SYM_ENUM;
229 r->next = (*$1)->next; *$3 = r; (*$1)->next = NULL;
230 add_symbol(i->string, SYM_ENUM, s, is_extern);
231 $$ = $3;
232 }
233
234 /* Anonymous s/u/e definitions. Nothing needs doing. */
235 | ENUM_KEYW BRACE_PHRASE { $$ = $2; }
236 | STRUCT_KEYW class_body { $$ = $2; }
237 | UNION_KEYW class_body { $$ = $2; }
238 ;
239
240simple_type_specifier:
241 CHAR_KEYW
242 | SHORT_KEYW
243 | INT_KEYW
244 | LONG_KEYW
245 | SIGNED_KEYW
246 | UNSIGNED_KEYW
247 | FLOAT_KEYW
248 | DOUBLE_KEYW
249 | VOID_KEYW
250 | BOOL_KEYW
251 | TYPE { (*$1)->tag = SYM_TYPEDEF; $$ = $1; }
252 ;
253
254ptr_operator:
255 '*' cvar_qualifier_seq_opt
256 { $$ = $2 ? $2 : $1; }
257 ;
258
259cvar_qualifier_seq_opt:
260 /* empty */ { $$ = NULL; }
261 | cvar_qualifier_seq
262 ;
263
264cvar_qualifier_seq:
265 cvar_qualifier
266 | cvar_qualifier_seq cvar_qualifier { $$ = $2; }
267 ;
268
269cvar_qualifier:
270 CONST_KEYW | VOLATILE_KEYW | ATTRIBUTE_PHRASE
271 | RESTRICT_KEYW
272 { /* restrict has no effect in prototypes so ignore it */
273 remove_node($1);
274 $$ = $1;
275 }
276 ;
277
278declarator:
279 ptr_operator declarator { $$ = $2; }
280 | direct_declarator
281 ;
282
283direct_declarator:
284 IDENT
285 { if (current_name != NULL) {
286 error_with_pos("unexpected second declaration name");
287 YYERROR;
288 } else {
289 current_name = (*$1)->string;
290 $$ = $1;
291 }
292 }
293 | direct_declarator '(' parameter_declaration_clause ')'
294 { $$ = $4; }
295 | direct_declarator '(' error ')'
296 { $$ = $4; }
297 | direct_declarator BRACKET_PHRASE
298 { $$ = $2; }
299 | '(' declarator ')'
300 { $$ = $3; }
301 | '(' error ')'
302 { $$ = $3; }
303 ;
304
305/* Nested declarators differ from regular declarators in that they do
306 not record the symbols they find in the global symbol table. */
307nested_declarator:
308 ptr_operator nested_declarator { $$ = $2; }
309 | direct_nested_declarator
310 ;
311
312direct_nested_declarator:
313 IDENT
314 | TYPE
315 | direct_nested_declarator '(' parameter_declaration_clause ')'
316 { $$ = $4; }
317 | direct_nested_declarator '(' error ')'
318 { $$ = $4; }
319 | direct_nested_declarator BRACKET_PHRASE
320 { $$ = $2; }
321 | '(' nested_declarator ')'
322 { $$ = $3; }
323 | '(' error ')'
324 { $$ = $3; }
325 ;
326
327parameter_declaration_clause:
328 parameter_declaration_list_opt DOTS { $$ = $2; }
329 | parameter_declaration_list_opt
330 | parameter_declaration_list ',' DOTS { $$ = $3; }
331 ;
332
333parameter_declaration_list_opt:
334 /* empty */ { $$ = NULL; }
335 | parameter_declaration_list
336 ;
337
338parameter_declaration_list:
339 parameter_declaration
340 | parameter_declaration_list ',' parameter_declaration
341 { $$ = $3; }
342 ;
343
344parameter_declaration:
345 decl_specifier_seq m_abstract_declarator
346 { $$ = $2 ? $2 : $1; }
347 ;
348
349m_abstract_declarator:
350 ptr_operator m_abstract_declarator
351 { $$ = $2 ? $2 : $1; }
352 | direct_m_abstract_declarator
353 ;
354
355direct_m_abstract_declarator:
356 /* empty */ { $$ = NULL; }
357 | IDENT
358 { /* For version 2 checksums, we don't want to remember
359 private parameter names. */
360 remove_node($1);
361 $$ = $1;
362 }
363 /* This wasn't really a typedef name but an identifier that
364 shadows one. */
365 | TYPE
366 { remove_node($1);
367 $$ = $1;
368 }
369 | direct_m_abstract_declarator '(' parameter_declaration_clause ')'
370 { $$ = $4; }
371 | direct_m_abstract_declarator '(' error ')'
372 { $$ = $4; }
373 | direct_m_abstract_declarator BRACKET_PHRASE
374 { $$ = $2; }
375 | '(' m_abstract_declarator ')'
376 { $$ = $3; }
377 | '(' error ')'
378 { $$ = $3; }
379 ;
380
381function_definition:
382 decl_specifier_seq_opt declarator BRACE_PHRASE
383 { struct string_list *decl = *$2;
384 *$2 = NULL;
385 add_symbol(current_name, SYM_NORMAL, decl, is_extern);
386 $$ = $3;
387 }
388 ;
389
390initializer_opt:
391 /* empty */ { $$ = NULL; }
392 | initializer
393 ;
394
395/* We never care about the contents of an initializer. */
396initializer:
397 '=' EXPRESSION_PHRASE
398 { remove_list($2, &(*$1)->next); $$ = $2; }
399 ;
400
401class_body:
402 '{' member_specification_opt '}' { $$ = $3; }
403 | '{' error '}' { $$ = $3; }
404 ;
405
406member_specification_opt:
407 /* empty */ { $$ = NULL; }
408 | member_specification
409 ;
410
411member_specification:
412 member_declaration
413 | member_specification member_declaration { $$ = $2; }
414 ;
415
416member_declaration:
417 decl_specifier_seq_opt member_declarator_list_opt ';'
418 { $$ = $3; }
419 | error ';'
420 { $$ = $2; }
421 ;
422
423member_declarator_list_opt:
424 /* empty */ { $$ = NULL; }
425 | member_declarator_list
426 ;
427
428member_declarator_list:
429 member_declarator
430 | member_declarator_list ',' member_declarator { $$ = $3; }
431 ;
432
433member_declarator:
434 nested_declarator attribute_opt { $$ = $2 ? $2 : $1; }
435 | IDENT member_bitfield_declarator { $$ = $2; }
436 | member_bitfield_declarator
437 ;
438
439member_bitfield_declarator:
440 ':' EXPRESSION_PHRASE { $$ = $2; }
441 ;
442
443attribute_opt:
444 /* empty */ { $$ = NULL; }
445 | ATTRIBUTE_PHRASE
446 ;
447
448asm_definition:
449 ASM_PHRASE ';' { $$ = $2; }
450 ;
451
452asm_phrase_opt:
453 /* empty */ { $$ = NULL; }
454 | ASM_PHRASE
455 ;
456
457export_definition:
458 EXPORT_SYMBOL_KEYW '(' IDENT ')' ';'
459 { export_symbol((*$3)->string); $$ = $5; }
460 ;
461
462
463%%
464
465static void
466yyerror(const char *e)
467{
468 error_with_pos("%s", e);
469}
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-26 16:43:36 -0500