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math: array parameters can be NULL
[smatch.git] / parse.c
blobcc3a5336f1dcb40fe9cde6b7537894db0791c4ef
1 /*
2 * Stupid C parser, version 1e-6.
3 *
4 * Let's see how hard this is to do.
5 *
6 * Copyright (C) 2003 Transmeta Corp.
7 * 2003-2004 Linus Torvalds
8 * Copyright (C) 2004 Christopher Li
9 *
10 * Permission is hereby granted, free of charge, to any person obtaining a copy
11 * of this software and associated documentation files (the "Software"), to deal
12 * in the Software without restriction, including without limitation the rights
13 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
14 * copies of the Software, and to permit persons to whom the Software is
15 * furnished to do so, subject to the following conditions:
16 *
17 * The above copyright notice and this permission notice shall be included in
18 * all copies or substantial portions of the Software.
19 *
20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
21 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
23 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
24 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
25 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
26 * THE SOFTWARE.
27 */
28
29 #include <stdarg.h>
30 #include <stdlib.h>
31 #include <stdio.h>
32 #include <string.h>
33 #include <ctype.h>
34 #include <unistd.h>
35 #include <fcntl.h>
36 #include <limits.h>
37
38 #include "lib.h"
39 #include "allocate.h"
40 #include "token.h"
41 #include "parse.h"
42 #include "symbol.h"
43 #include "scope.h"
44 #include "expression.h"
45 #include "target.h"
46
47 static struct symbol_list **function_symbol_list;
48 struct symbol_list *function_computed_target_list;
49 struct statement_list *function_computed_goto_list;
50
51 static struct token *statement(struct token *token, struct statement **tree);
52 static struct token *handle_attributes(struct token *token, struct decl_state *ctx, unsigned int keywords);
53
54 typedef struct token *declarator_t(struct token *, struct decl_state *);
55 static declarator_t
56 struct_specifier, union_specifier, enum_specifier,
57 attribute_specifier, typeof_specifier, parse_asm_declarator,
58 typedef_specifier, inline_specifier, auto_specifier,
59 register_specifier, static_specifier, extern_specifier,
60 thread_specifier, const_qualifier, volatile_qualifier;
61 static declarator_t restrict_qualifier;
62 static declarator_t atomic_qualifier;
63 static declarator_t autotype_specifier;
64
65 static struct token *parse_if_statement(struct token *token, struct statement *stmt);
66 static struct token *parse_return_statement(struct token *token, struct statement *stmt);
67 static struct token *parse_loop_iterator(struct token *token, struct statement *stmt);
68 static struct token *parse_default_statement(struct token *token, struct statement *stmt);
69 static struct token *parse_case_statement(struct token *token, struct statement *stmt);
70 static struct token *parse_switch_statement(struct token *token, struct statement *stmt);
71 static struct token *parse_for_statement(struct token *token, struct statement *stmt);
72 static struct token *parse_while_statement(struct token *token, struct statement *stmt);
73 static struct token *parse_do_statement(struct token *token, struct statement *stmt);
74 static struct token *parse_goto_statement(struct token *token, struct statement *stmt);
75 static struct token *parse_context_statement(struct token *token, struct statement *stmt);
76 static struct token *parse_range_statement(struct token *token, struct statement *stmt);
77 static struct token *parse_asm_statement(struct token *token, struct statement *stmt);
78 static struct token *toplevel_asm_declaration(struct token *token, struct symbol_list **list);
79 static struct token *parse_static_assert(struct token *token, struct symbol_list **unused);
80
81 typedef struct token *attr_t(struct token *, struct symbol *,
82 struct decl_state *);
83
84 static attr_t
85 attribute_packed, attribute_aligned, attribute_modifier,
86 attribute_function,
87 attribute_bitwise,
88 attribute_address_space, attribute_context,
89 attribute_designated_init,
90 attribute_transparent_union, ignore_attribute,
91 attribute_mode, attribute_force;
92
93 typedef struct symbol *to_mode_t(struct symbol *);
94
95 static to_mode_t
96 to_QI_mode, to_HI_mode, to_SI_mode, to_DI_mode, to_TI_mode;
97 static to_mode_t to_pointer_mode, to_word_mode;
98
99 enum {
100 Set_T = 1,
101 Set_S = 2,
102 Set_Char = 4,
103 Set_Int = 8,
104 Set_Double = 16,
105 Set_Float = 32,
106 Set_Signed = 64,
107 Set_Unsigned = 128,
108 Set_Short = 256,
109 Set_Long = 512,
110 Set_Vlong = 1024,
111 Set_Int128 = 2048,
112 Set_Any = Set_T | Set_Short | Set_Long | Set_Signed | Set_Unsigned
113 };
114
115 enum {
116 CInt = 0, CSInt, CUInt, CReal,
117 };
118
119 enum {
120 SNone = 0, STypedef, SAuto, SRegister, SExtern, SStatic, SForced, SMax,
121 };
122
123 static void asm_modifier(struct token *token, unsigned long *mods, unsigned long mod)
124 {
125 if (*mods & mod)
126 warning(token->pos, "duplicated asm modifier");
127 *mods |= mod;
128 }
129
130 static void asm_modifier_volatile(struct token *token, unsigned long *mods)
131 {
132 asm_modifier(token, mods, MOD_VOLATILE);
133 }
134
135 static void asm_modifier_inline(struct token *token, unsigned long *mods)
136 {
137 asm_modifier(token, mods, MOD_INLINE);
138 }
139
140 static struct symbol_op typedef_op = {
141 .type = KW_MODIFIER,
142 .declarator = typedef_specifier,
143 };
144
145 static struct symbol_op inline_op = {
146 .type = KW_MODIFIER,
147 .declarator = inline_specifier,
148 .asm_modifier = asm_modifier_inline,
149 };
150
151 static declarator_t noreturn_specifier;
152 static struct symbol_op noreturn_op = {
153 .type = KW_MODIFIER,
154 .declarator = noreturn_specifier,
155 };
156
157 static declarator_t alignas_specifier;
158 static struct symbol_op alignas_op = {
159 .type = KW_MODIFIER,
160 .declarator = alignas_specifier,
161 };
162
163 static struct symbol_op auto_op = {
164 .type = KW_MODIFIER,
165 .declarator = auto_specifier,
166 };
167
168 static struct symbol_op register_op = {
169 .type = KW_MODIFIER,
170 .declarator = register_specifier,
171 };
172
173 static struct symbol_op static_op = {
174 .type = KW_MODIFIER,
175 .declarator = static_specifier,
176 };
177
178 static struct symbol_op extern_op = {
179 .type = KW_MODIFIER,
180 .declarator = extern_specifier,
181 };
182
183 static struct symbol_op thread_op = {
184 .type = KW_MODIFIER,
185 .declarator = thread_specifier,
186 };
187
188 static struct symbol_op const_op = {
189 .type = KW_QUALIFIER,
190 .declarator = const_qualifier,
191 };
192
193 static struct symbol_op volatile_op = {
194 .type = KW_QUALIFIER,
195 .declarator = volatile_qualifier,
196 .asm_modifier = asm_modifier_volatile,
197 };
198
199 static struct symbol_op restrict_op = {
200 .type = KW_QUALIFIER,
201 .declarator = restrict_qualifier,
202 };
203
204 static struct symbol_op atomic_op = {
205 .type = KW_QUALIFIER,
206 .declarator = atomic_qualifier,
207 };
208
209 static struct symbol_op typeof_op = {
210 .type = KW_SPECIFIER,
211 .declarator = typeof_specifier,
212 .test = Set_Any,
213 .set = Set_S|Set_T,
214 };
215
216 static struct symbol_op autotype_op = {
217 .type = KW_SPECIFIER,
218 .declarator = autotype_specifier,
219 .test = Set_Any,
220 .set = Set_S|Set_T,
221 };
222
223 static struct symbol_op attribute_op = {
224 .type = KW_ATTRIBUTE,
225 .declarator = attribute_specifier,
226 };
227
228 static struct symbol_op struct_op = {
229 .type = KW_SPECIFIER,
230 .declarator = struct_specifier,
231 .test = Set_Any,
232 .set = Set_S|Set_T,
233 };
234
235 static struct symbol_op union_op = {
236 .type = KW_SPECIFIER,
237 .declarator = union_specifier,
238 .test = Set_Any,
239 .set = Set_S|Set_T,
240 };
241
242 static struct symbol_op enum_op = {
243 .type = KW_SPECIFIER,
244 .declarator = enum_specifier,
245 .test = Set_Any,
246 .set = Set_S|Set_T,
247 };
248
249 static struct symbol_op spec_op = {
250 .type = KW_SPECIFIER | KW_EXACT,
251 .test = Set_Any,
252 .set = Set_S|Set_T,
253 };
254
255 static struct symbol_op char_op = {
256 .type = KW_SPECIFIER,
257 .test = Set_T|Set_Long|Set_Short,
258 .set = Set_T|Set_Char,
259 .class = CInt,
260 };
261
262 static struct symbol_op int_op = {
263 .type = KW_SPECIFIER,
264 .test = Set_T,
265 .set = Set_T|Set_Int,
266 };
267
268 static struct symbol_op double_op = {
269 .type = KW_SPECIFIER,
270 .test = Set_T|Set_Signed|Set_Unsigned|Set_Short|Set_Vlong,
271 .set = Set_T|Set_Double,
272 .class = CReal,
273 };
274
275 static struct symbol_op float_op = {
276 .type = KW_SPECIFIER,
277 .test = Set_T|Set_Signed|Set_Unsigned|Set_Short|Set_Long,
278 .set = Set_T|Set_Float,
279 .class = CReal,
280 };
281
282 static struct symbol_op short_op = {
283 .type = KW_SPECIFIER,
284 .test = Set_S|Set_Char|Set_Float|Set_Double|Set_Long|Set_Short,
285 .set = Set_Short,
286 };
287
288 static struct symbol_op signed_op = {
289 .type = KW_SPECIFIER,
290 .test = Set_S|Set_Float|Set_Double|Set_Signed|Set_Unsigned,
291 .set = Set_Signed,
292 .class = CSInt,
293 };
294
295 static struct symbol_op unsigned_op = {
296 .type = KW_SPECIFIER,
297 .test = Set_S|Set_Float|Set_Double|Set_Signed|Set_Unsigned,
298 .set = Set_Unsigned,
299 .class = CUInt,
300 };
301
302 static struct symbol_op long_op = {
303 .type = KW_SPECIFIER,
304 .test = Set_S|Set_Char|Set_Float|Set_Short|Set_Vlong,
305 .set = Set_Long,
306 };
307
308 static struct symbol_op int128_op = {
309 .type = KW_SPECIFIER,
310 .test = Set_S|Set_T|Set_Char|Set_Short|Set_Int|Set_Float|Set_Double|Set_Long|Set_Vlong|Set_Int128,
311 .set = Set_T|Set_Int128|Set_Vlong,
312 .class = CInt,
313 };
314
315 static struct symbol_op if_op = {
316 .statement = parse_if_statement,
317 };
318
319 static struct symbol_op return_op = {
320 .statement = parse_return_statement,
321 };
322
323 static struct symbol_op loop_iter_op = {
324 .statement = parse_loop_iterator,
325 };
326
327 static struct symbol_op default_op = {
328 .statement = parse_default_statement,
329 };
330
331 static struct symbol_op case_op = {
332 .statement = parse_case_statement,
333 };
334
335 static struct symbol_op switch_op = {
336 .statement = parse_switch_statement,
337 };
338
339 static struct symbol_op for_op = {
340 .statement = parse_for_statement,
341 };
342
343 static struct symbol_op while_op = {
344 .statement = parse_while_statement,
345 };
346
347 static struct symbol_op do_op = {
348 .statement = parse_do_statement,
349 };
350
351 static struct symbol_op goto_op = {
352 .statement = parse_goto_statement,
353 };
354
355 static struct symbol_op __context___op = {
356 .statement = parse_context_statement,
357 .attribute = attribute_context,
358 };
359
360 static struct symbol_op range_op = {
361 .statement = parse_range_statement,
362 };
363
364 static struct symbol_op asm_op = {
365 .type = KW_ASM,
366 .declarator = parse_asm_declarator,
367 .statement = parse_asm_statement,
368 .toplevel = toplevel_asm_declaration,
369 };
370
371 static struct symbol_op static_assert_op = {
372 .toplevel = parse_static_assert,
373 };
374
375 static struct symbol_op packed_op = {
376 .attribute = attribute_packed,
377 };
378
379 static struct symbol_op aligned_op = {
380 .attribute = attribute_aligned,
381 };
382
383 static struct symbol_op attr_mod_op = {
384 .attribute = attribute_modifier,
385 };
386
387 static struct symbol_op attr_fun_op = {
388 .attribute = attribute_function,
389 };
390
391 static struct symbol_op attr_bitwise_op = {
392 .attribute = attribute_bitwise,
393 };
394
395 static struct symbol_op attr_force_op = {
396 .attribute = attribute_force,
397 };
398
399 static struct symbol_op address_space_op = {
400 .attribute = attribute_address_space,
401 };
402
403 static struct symbol_op mode_op = {
404 .attribute = attribute_mode,
405 };
406
407 static struct symbol_op context_op = {
408 .attribute = attribute_context,
409 };
410
411 static struct symbol_op designated_init_op = {
412 .attribute = attribute_designated_init,
413 };
414
415 static struct symbol_op transparent_union_op = {
416 .attribute = attribute_transparent_union,
417 };
418
419 static struct symbol_op ignore_attr_op = {
420 .attribute = ignore_attribute,
421 };
422
423 static struct symbol_op mode_QI_op = {
424 .type = KW_MODE,
425 .to_mode = to_QI_mode
426 };
427
428 static struct symbol_op mode_HI_op = {
429 .type = KW_MODE,
430 .to_mode = to_HI_mode
431 };
432
433 static struct symbol_op mode_SI_op = {
434 .type = KW_MODE,
435 .to_mode = to_SI_mode
436 };
437
438 static struct symbol_op mode_DI_op = {
439 .type = KW_MODE,
440 .to_mode = to_DI_mode
441 };
442
443 static struct symbol_op mode_TI_op = {
444 .type = KW_MODE,
445 .to_mode = to_TI_mode
446 };
447
448 static struct symbol_op mode_pointer_op = {
449 .type = KW_MODE,
450 .to_mode = to_pointer_mode
451 };
452
453 static struct symbol_op mode_word_op = {
454 .type = KW_MODE,
455 .to_mode = to_word_mode
456 };
457
458 /* Using NS_TYPEDEF will also make the keyword a reserved one */
459 static struct init_keyword {
460 const char *name;
461 enum namespace ns;
462 unsigned long modifiers;
463 struct symbol_op *op;
464 struct symbol *type;
465 } keyword_table[] = {
466 /* Type qualifiers */
467 { "const", NS_TYPEDEF, .op = &const_op },
468 { "__const", NS_TYPEDEF, .op = &const_op },
469 { "__const__", NS_TYPEDEF, .op = &const_op },
470 { "volatile", NS_TYPEDEF, .op = &volatile_op },
471 { "__volatile", NS_TYPEDEF, .op = &volatile_op },
472 { "__volatile__", NS_TYPEDEF, .op = &volatile_op },
473 { "restrict", NS_TYPEDEF, .op = &restrict_op},
474 { "__restrict", NS_TYPEDEF, .op = &restrict_op},
475 { "__restrict__", NS_TYPEDEF, .op = &restrict_op},
476 { "_Atomic", NS_TYPEDEF, .op = &atomic_op},
477
478 /* Typedef.. */
479 { "typedef", NS_TYPEDEF, .op = &typedef_op },
480
481 /* Type specifiers */
482 { "void", NS_TYPEDEF, .type = &void_ctype, .op = &spec_op},
483 { "char", NS_TYPEDEF, .op = &char_op },
484 { "short", NS_TYPEDEF, .op = &short_op },
485 { "int", NS_TYPEDEF, .op = &int_op },
486 { "long", NS_TYPEDEF, .op = &long_op },
487 { "float", NS_TYPEDEF, .op = &float_op },
488 { "double", NS_TYPEDEF, .op = &double_op },
489 { "signed", NS_TYPEDEF, .op = &signed_op },
490 { "__signed", NS_TYPEDEF, .op = &signed_op },
491 { "__signed__", NS_TYPEDEF, .op = &signed_op },
492 { "unsigned", NS_TYPEDEF, .op = &unsigned_op },
493 { "__int128", NS_TYPEDEF, .op = &int128_op },
494 { "_Bool", NS_TYPEDEF, .type = &bool_ctype, .op = &spec_op },
495
496 /* Predeclared types */
497 { "__builtin_va_list", NS_TYPEDEF, .type = &ptr_ctype, .op = &spec_op },
498 { "__builtin_ms_va_list", NS_TYPEDEF, .type = &ptr_ctype, .op = &spec_op },
499 { "__int128_t", NS_TYPEDEF, .type = &sint128_ctype, .op = &spec_op },
500 { "__uint128_t",NS_TYPEDEF, .type = &uint128_ctype, .op = &spec_op },
501 { "_Float32", NS_TYPEDEF, .type = &float32_ctype, .op = &spec_op },
502 { "_Float32x", NS_TYPEDEF, .type = &float32x_ctype, .op = &spec_op },
503 { "_Float64", NS_TYPEDEF, .type = &float64_ctype, .op = &spec_op },
504 { "_Float64x", NS_TYPEDEF, .type = &float64x_ctype, .op = &spec_op },
505 { "_Float128", NS_TYPEDEF, .type = &float128_ctype, .op = &spec_op },
506
507 /* Extended types */
508 { "typeof", NS_TYPEDEF, .op = &typeof_op },
509 { "__typeof", NS_TYPEDEF, .op = &typeof_op },
510 { "__typeof__", NS_TYPEDEF, .op = &typeof_op },
511 { "__auto_type",NS_TYPEDEF, .op = &autotype_op },
512
513 { "__attribute", NS_TYPEDEF, .op = &attribute_op },
514 { "__attribute__", NS_TYPEDEF, .op = &attribute_op },
515
516 { "struct", NS_TYPEDEF, .op = &struct_op },
517 { "union", NS_TYPEDEF, .op = &union_op },
518 { "enum", NS_TYPEDEF, .op = &enum_op },
519
520 { "inline", NS_TYPEDEF, .op = &inline_op },
521 { "__inline", NS_TYPEDEF, .op = &inline_op },
522 { "__inline__", NS_TYPEDEF, .op = &inline_op },
523
524 { "_Noreturn", NS_TYPEDEF, .op = &noreturn_op },
525
526 { "_Alignas", NS_TYPEDEF, .op = &alignas_op },
527
528 /* Static assertion */
529 { "_Static_assert", NS_KEYWORD, .op = &static_assert_op },
530
531 /* Storage class */
532 { "auto", NS_TYPEDEF, .op = &auto_op },
533 { "register", NS_TYPEDEF, .op = &register_op },
534 { "static", NS_TYPEDEF, .op = &static_op },
535 { "extern", NS_TYPEDEF, .op = &extern_op },
536 { "__thread", NS_TYPEDEF, .op = &thread_op },
537 { "_Thread_local", NS_TYPEDEF, .op = &thread_op },
538
539 /* Statement */
540 { "if", NS_KEYWORD, .op = &if_op },
541 { "return", NS_KEYWORD, .op = &return_op },
542 { "break", NS_KEYWORD, .op = &loop_iter_op },
543 { "continue", NS_KEYWORD, .op = &loop_iter_op },
544 { "default", NS_KEYWORD, .op = &default_op },
545 { "case", NS_KEYWORD, .op = &case_op },
546 { "switch", NS_KEYWORD, .op = &switch_op },
547 { "for", NS_KEYWORD, .op = &for_op },
548 { "while", NS_KEYWORD, .op = &while_op },
549 { "do", NS_KEYWORD, .op = &do_op },
550 { "goto", NS_KEYWORD, .op = &goto_op },
551 { "context", NS_KEYWORD, .op = &context_op },
552 { "__context__",NS_KEYWORD, .op = &__context___op },
553 { "__range__", NS_KEYWORD, .op = &range_op },
554 { "asm", NS_KEYWORD, .op = &asm_op },
555 { "__asm", NS_KEYWORD, .op = &asm_op },
556 { "__asm__", NS_KEYWORD, .op = &asm_op },
557
558 /* Attribute */
559 { "packed", NS_KEYWORD, .op = &packed_op },
560 { "__packed__", NS_KEYWORD, .op = &packed_op },
561 { "aligned", NS_KEYWORD, .op = &aligned_op },
562 { "__aligned__",NS_KEYWORD, .op = &aligned_op },
563 { "nocast", NS_KEYWORD, MOD_NOCAST, .op = &attr_mod_op },
564 { "__nocast__", NS_KEYWORD, MOD_NOCAST, .op = &attr_mod_op },
565 { "noderef", NS_KEYWORD, MOD_NODEREF, .op = &attr_mod_op },
566 { "__noderef__",NS_KEYWORD, MOD_NODEREF, .op = &attr_mod_op },
567 { "safe", NS_KEYWORD, MOD_SAFE, .op = &attr_mod_op },
568 { "__safe__", NS_KEYWORD, MOD_SAFE, .op = &attr_mod_op },
569 { "unused", NS_KEYWORD, MOD_UNUSED, .op = &attr_mod_op },
570 { "__unused__", NS_KEYWORD, MOD_UNUSED, .op = &attr_mod_op },
571 { "externally_visible", NS_KEYWORD, MOD_EXT_VISIBLE,.op = &attr_mod_op },
572 { "__externally_visible__", NS_KEYWORD,MOD_EXT_VISIBLE,.op = &attr_mod_op },
573 { "force", NS_KEYWORD, .op = &attr_force_op },
574 { "__force__", NS_KEYWORD, .op = &attr_force_op },
575 { "bitwise", NS_KEYWORD, MOD_BITWISE, .op = &attr_bitwise_op },
576 { "__bitwise__",NS_KEYWORD, MOD_BITWISE, .op = &attr_bitwise_op },
577 { "address_space",NS_KEYWORD, .op = &address_space_op },
578 { "__address_space__",NS_KEYWORD, .op = &address_space_op },
579 { "designated_init", NS_KEYWORD, .op = &designated_init_op },
580 { "__designated_init__", NS_KEYWORD, .op = &designated_init_op },
581 { "transparent_union", NS_KEYWORD, .op = &transparent_union_op },
582 { "__transparent_union__", NS_KEYWORD, .op = &transparent_union_op },
583 { "noreturn", NS_KEYWORD, MOD_NORETURN, .op = &attr_fun_op },
584 { "__noreturn__", NS_KEYWORD, MOD_NORETURN, .op = &attr_fun_op },
585 { "pure", NS_KEYWORD, MOD_PURE, .op = &attr_fun_op },
586 {"__pure__", NS_KEYWORD, MOD_PURE, .op = &attr_fun_op },
587 {"const", NS_KEYWORD, MOD_PURE, .op = &attr_fun_op },
588 {"__const", NS_KEYWORD, MOD_PURE, .op = &attr_fun_op },
589 {"__const__", NS_KEYWORD, MOD_PURE, .op = &attr_fun_op },
590 {"gnu_inline", NS_KEYWORD, MOD_GNU_INLINE, .op = &attr_fun_op },
591 {"__gnu_inline__",NS_KEYWORD, MOD_GNU_INLINE, .op = &attr_fun_op },
592
593 { "mode", NS_KEYWORD, .op = &mode_op },
594 { "__mode__", NS_KEYWORD, .op = &mode_op },
595 { "QI", NS_KEYWORD, .op = &mode_QI_op },
596 { "__QI__", NS_KEYWORD, .op = &mode_QI_op },
597 { "HI", NS_KEYWORD, .op = &mode_HI_op },
598 { "__HI__", NS_KEYWORD, .op = &mode_HI_op },
599 { "SI", NS_KEYWORD, .op = &mode_SI_op },
600 { "__SI__", NS_KEYWORD, .op = &mode_SI_op },
601 { "DI", NS_KEYWORD, .op = &mode_DI_op },
602 { "__DI__", NS_KEYWORD, .op = &mode_DI_op },
603 { "TI", NS_KEYWORD, .op = &mode_TI_op },
604 { "__TI__", NS_KEYWORD, .op = &mode_TI_op },
605 { "byte", NS_KEYWORD, .op = &mode_QI_op },
606 { "__byte__", NS_KEYWORD, .op = &mode_QI_op },
607 { "pointer", NS_KEYWORD, .op = &mode_pointer_op },
608 { "__pointer__",NS_KEYWORD, .op = &mode_pointer_op },
609 { "word", NS_KEYWORD, .op = &mode_word_op },
610 { "__word__", NS_KEYWORD, .op = &mode_word_op },
611 };
612
613
614 static const char *ignored_attributes[] = {
615
616 #define GCC_ATTR(x) \
617 STRINGIFY(x), \
618 STRINGIFY(__##x##__),
619
620 #include "gcc-attr-list.h"
621
622 #undef GCC_ATTR
623
624 "bounded",
625 "__bounded__",
626 "__noclone",
627 "__nonnull",
628 "__nothrow",
629 };
630
631
632 void init_parser(int stream)
633 {
634 int i;
635 for (i = 0; i < ARRAY_SIZE(keyword_table); i++) {
636 struct init_keyword *ptr = keyword_table + i;
637 struct symbol *sym = create_symbol(stream, ptr->name, SYM_KEYWORD, ptr->ns);
638 sym->ident->keyword = 1;
639 if (ptr->ns == NS_TYPEDEF)
640 sym->ident->reserved = 1;
641 sym->ctype.modifiers = ptr->modifiers;
642 sym->ctype.base_type = ptr->type;
643 sym->op = ptr->op;
644 }
645
646 for (i = 0; i < ARRAY_SIZE(ignored_attributes); i++) {
647 const char * name = ignored_attributes[i];
648 struct symbol *sym = create_symbol(stream, name, SYM_KEYWORD,
649 NS_KEYWORD);
650 if (!sym->op) {
651 sym->ident->keyword = 1;
652 sym->op = &ignore_attr_op;
653 }
654 }
655 }
656
657
658 static struct token *skip_to(struct token *token, int op)
659 {
660 while (!match_op(token, op) && !eof_token(token))
661 token = token->next;
662 return token;
663 }
664
665 static struct token bad_token = { .pos.type = TOKEN_BAD };
666 struct token *expect(struct token *token, int op, const char *where)
667 {
668 if (!match_op(token, op)) {
669 if (token != &bad_token) {
670 bad_token.next = token;
671 sparse_error(token->pos, "Expected %s %s", show_special(op), where);
672 sparse_error(token->pos, "got %s", show_token(token));
673 }
674 if (op == ';')
675 return skip_to(token, op);
676 return &bad_token;
677 }
678 return token->next;
679 }
680
681 ///
682 // issue an error message on new parsing errors
683 // @token: the current token
684 // @errmsg: the error message
685 // If the current token is from a previous error, an error message
686 // has already been issued, so nothing more is done.
687 // Otherwise, @errmsg is displayed followed by the current token.
688 static void unexpected(struct token *token, const char *errmsg)
689 {
690 if (token == &bad_token)
691 return;
692 sparse_error(token->pos, "%s", errmsg);
693 sparse_error(token->pos, "got %s", show_token(token));
694 }
695
696 // Add a symbol to the list of function-local symbols
697 static void fn_local_symbol(struct symbol *sym)
698 {
699 if (function_symbol_list)
700 add_symbol(function_symbol_list, sym);
701 }
702
703 static int SENTINEL_ATTR match_idents(struct token *token, ...)
704 {
705 va_list args;
706 struct ident * next;
707
708 if (token_type(token) != TOKEN_IDENT)
709 return 0;
710
711 va_start(args, token);
712 do {
713 next = va_arg(args, struct ident *);
714 } while (next && token->ident != next);
715 va_end(args);
716
717 return next && token->ident == next;
718 }
719
720
721 struct statement *alloc_statement(struct position pos, int type)
722 {
723 struct statement *stmt = __alloc_statement(0);
724 stmt->type = type;
725 stmt->pos = pos;
726 return stmt;
727 }
728
729 static struct token *struct_declaration_list(struct token *token, struct symbol_list **list);
730
731 static void apply_ctype(struct position pos, struct ctype *thistype, struct ctype *ctype);
732
733 static void apply_modifiers(struct position pos, struct decl_state *ctx)
734 {
735 struct symbol *ctype;
736 if (!ctx->mode)
737 return;
738 ctype = ctx->mode->to_mode(ctx->ctype.base_type);
739 if (!ctype)
740 sparse_error(pos, "don't know how to apply mode to %s",
741 show_typename(ctx->ctype.base_type));
742 else
743 ctx->ctype.base_type = ctype;
744
745 }
746
747 static struct symbol * alloc_indirect_symbol(struct position pos, struct ctype *ctype, int type)
748 {
749 struct symbol *sym = alloc_symbol(pos, type);
750
751 sym->ctype.base_type = ctype->base_type;
752 sym->ctype.modifiers = ctype->modifiers;
753
754 ctype->base_type = sym;
755 ctype->modifiers = 0;
756 return sym;
757 }
758
759 /*
760 * NOTE! NS_LABEL is not just a different namespace,
761 * it also ends up using function scope instead of the
762 * regular symbol scope.
763 */
764 struct symbol *label_symbol(struct token *token, int used)
765 {
766 struct symbol *sym = lookup_symbol(token->ident, NS_LABEL);
767 if (!sym) {
768 sym = alloc_symbol(token->pos, SYM_LABEL);
769 bind_symbol(sym, token->ident, NS_LABEL);
770 if (used)
771 sym->used = 1;
772 fn_local_symbol(sym);
773 }
774 return sym;
775 }
776
777 static struct token *struct_union_enum_specifier(enum type type,
778 struct token *token, struct decl_state *ctx,
779 struct token *(*parse)(struct token *, struct symbol *))
780 {
781 struct symbol *sym;
782 struct position *repos;
783
784 token = handle_attributes(token, ctx, KW_ATTRIBUTE);
785 if (token_type(token) == TOKEN_IDENT) {
786 sym = lookup_symbol(token->ident, NS_STRUCT);
787 if (!sym ||
788 (is_outer_scope(sym->scope) &&
789 (match_op(token->next,';') || match_op(token->next,'{')))) {
790 // Either a new symbol, or else an out-of-scope
791 // symbol being redefined.
792 sym = alloc_symbol(token->pos, type);
793 bind_symbol(sym, token->ident, NS_STRUCT);
794 }
795 if (sym->type != type)
796 error_die(token->pos, "invalid tag applied to %s", show_typename (sym));
797 ctx->ctype.base_type = sym;
798 repos = &token->pos;
799 token = token->next;
800 if (match_op(token, '{')) {
801 struct decl_state attr = { .ctype.base_type = sym, };
802
803 // The following test is actually wrong for empty
804 // structs, but (1) they are not C99, (2) gcc does
805 // the same thing, and (3) it's easier.
806 if (sym->symbol_list)
807 error_die(token->pos, "redefinition of %s", show_typename (sym));
808 sym->pos = *repos;
809 token = parse(token->next, sym);
810 token = expect(token, '}', "at end of struct-union-enum-specifier");
811
812 token = handle_attributes(token, &attr, KW_ATTRIBUTE);
813 apply_ctype(token->pos, &attr.ctype, &sym->ctype);
814
815 // Mark the structure as needing re-examination
816 sym->examined = 0;
817 sym->endpos = token->pos;
818 }
819 return token;
820 }
821
822 // private struct/union/enum type
823 if (!match_op(token, '{')) {
824 sparse_error(token->pos, "expected declaration");
825 ctx->ctype.base_type = &bad_ctype;
826 return token;
827 }
828
829 sym = alloc_symbol(token->pos, type);
830 set_current_scope(sym); // used by dissect
831 token = parse(token->next, sym);
832 ctx->ctype.base_type = sym;
833 token = expect(token, '}', "at end of specifier");
834 sym->endpos = token->pos;
835
836 return token;
837 }
838
839 static struct token *parse_struct_declaration(struct token *token, struct symbol *sym)
840 {
841 struct symbol *field, *last = NULL;
842 struct token *res;
843 res = struct_declaration_list(token, &sym->symbol_list);
844 FOR_EACH_PTR(sym->symbol_list, field) {
845 if (!field->ident) {
846 struct symbol *base = field->ctype.base_type;
847 if (base && base->type == SYM_BITFIELD)
848 continue;
849 }
850 if (last)
851 last->next_subobject = field;
852 last = field;
853 } END_FOR_EACH_PTR(field);
854 return res;
855 }
856
857 static struct token *parse_union_declaration(struct token *token, struct symbol *sym)
858 {
859 return struct_declaration_list(token, &sym->symbol_list);
860 }
861
862 static struct token *struct_specifier(struct token *token, struct decl_state *ctx)
863 {
864 return struct_union_enum_specifier(SYM_STRUCT, token, ctx, parse_struct_declaration);
865 }
866
867 static struct token *union_specifier(struct token *token, struct decl_state *ctx)
868 {
869 return struct_union_enum_specifier(SYM_UNION, token, ctx, parse_union_declaration);
870 }
871
872 ///
873 // safe right shift
874 //
875 // This allow to use a shift amount as big (or bigger)
876 // than the width of the value to be shifted, in which case
877 // the result is, of course, 0.
878 static unsigned long long rshift(unsigned long long val, unsigned int n)
879 {
880 if (n >= (sizeof(val) * 8))
881 return 0;
882 return val >> n;
883 }
884
885 struct range {
886 long long neg;
887 unsigned long long pos;
888 };
889
890 static void update_range(struct range *range, unsigned long long uval, struct symbol *vtype)
891 {
892 long long sval = uval;
893
894 if (is_signed_type(vtype) && (sval < 0)) {
895 if (sval < range->neg)
896 range->neg = sval;
897 } else {
898 if (uval > range->pos)
899 range->pos = uval;
900 }
901 }
902
903 static int type_is_ok(struct symbol *type, struct range range)
904 {
905 int shift = type->bit_size;
906 int is_unsigned = type->ctype.modifiers & MOD_UNSIGNED;
907
908 if (!is_unsigned)
909 shift--;
910 if (rshift(range.pos, shift))
911 return 0;
912 if (range.neg == 0)
913 return 1;
914 if (is_unsigned)
915 return 0;
916 if (rshift(~range.neg, shift))
917 return 0;
918 return 1;
919 }
920
921 static struct range type_range(struct symbol *type)
922 {
923 struct range range;
924 unsigned int size = type->bit_size;
925 unsigned long long max;
926 long long min;
927
928 if (is_signed_type(type)) {
929 min = sign_bit(size);
930 max = min - 1;
931 } else {
932 min = 0;
933 max = bits_mask(size);
934 }
935
936 range.pos = max;
937 range.neg = min;
938 return range;
939 }
940
941 static int val_in_range(struct range *range, long long sval, struct symbol *vtype)
942 {
943 unsigned long long uval = sval;
944
945 if (is_signed_type(vtype) && (sval < 0))
946 return range->neg <= sval;
947 else
948 return uval <= range->pos;
949 }
950
951 static void cast_enum_list(struct symbol_list *list, struct symbol *base_type)
952 {
953 struct range irange = type_range(&int_ctype);
954 struct symbol *sym;
955
956 FOR_EACH_PTR(list, sym) {
957 struct expression *expr = sym->initializer;
958 struct symbol *ctype;
959 long long val;
960 if (expr->type != EXPR_VALUE)
961 continue;
962 ctype = expr->ctype;
963 val = get_expression_value(expr);
964 if (is_int_type(ctype) && val_in_range(&irange, val, ctype)) {
965 expr->ctype = &int_ctype;
966 continue;
967 }
968 cast_value(expr, base_type, expr, ctype);
969 expr->ctype = base_type;
970 } END_FOR_EACH_PTR(sym);
971 }
972
973 static struct token *parse_enum_declaration(struct token *token, struct symbol *parent)
974 {
975 unsigned long long lastval = 0;
976 struct symbol *ctype = NULL, *base_type = NULL;
977 struct range range = { };
978 int mix_bitwise = 0;
979
980 parent->examined = 1;
981 parent->ctype.base_type = &int_ctype;
982 while (token_type(token) == TOKEN_IDENT) {
983 struct expression *expr = NULL;
984 struct token *next = token->next;
985 struct decl_state ctx = { };
986 struct symbol *sym;
987
988 // FIXME: only 'deprecated' should be accepted
989 next = handle_attributes(next, &ctx, KW_ATTRIBUTE);
990
991 if (match_op(next, '=')) {
992 next = constant_expression(next->next, &expr);
993 lastval = get_expression_value(expr);
994 ctype = &void_ctype;
995 if (expr && expr->ctype)
996 ctype = expr->ctype;
997 } else if (!ctype) {
998 ctype = &int_ctype;
999 } else if (is_int_type(ctype)) {
1000 lastval++;
1001 } else {
1002 error_die(token->pos, "can't increment the last enum member");
1003 }
1004
1005 if (!expr) {
1006 expr = alloc_expression(token->pos, EXPR_VALUE);
1007 expr->value = lastval;
1008 expr->ctype = ctype;
1009 }
1010
1011 sym = alloc_symbol(token->pos, SYM_NODE);
1012 bind_symbol(sym, token->ident, NS_SYMBOL);
1013 sym->ctype.modifiers &= ~MOD_ADDRESSABLE;
1014 sym->initializer = expr;
1015 sym->enum_member = 1;
1016 sym->ctype.base_type = parent;
1017 add_ptr_list(&parent->symbol_list, sym);
1018
1019 if (base_type != &bad_ctype) {
1020 if (ctype->type == SYM_NODE)
1021 ctype = ctype->ctype.base_type;
1022 if (ctype->type == SYM_ENUM) {
1023 if (ctype == parent)
1024 ctype = base_type;
1025 else
1026 ctype = ctype->ctype.base_type;
1027 }
1028 /*
1029 * base_type rules:
1030 * - if all enums are of the same type, then
1031 * the base_type is that type (two first
1032 * cases)
1033 * - if enums are of different types, they
1034 * all have to be integer types, and the
1035 * base type is at least "int_ctype".
1036 * - otherwise the base_type is "bad_ctype".
1037 */
1038 if (!base_type || ctype == &bad_ctype) {
1039 base_type = ctype;
1040 } else if (ctype == base_type) {
1041 /* nothing */
1042 } else if (is_int_type(base_type) && is_int_type(ctype)) {
1043 base_type = &int_ctype;
1044 } else if (is_restricted_type(base_type) != is_restricted_type(ctype)) {
1045 if (!mix_bitwise++) {
1046 warning(expr->pos, "mixed bitwiseness");
1047 }
1048 } else if (is_restricted_type(base_type) && base_type != ctype) {
1049 sparse_error(expr->pos, "incompatible restricted type");
1050 info(expr->pos, " expected: %s", show_typename(base_type));
1051 info(expr->pos, " got: %s", show_typename(ctype));
1052 base_type = &bad_ctype;
1053 } else if (base_type != &bad_ctype) {
1054 sparse_error(token->pos, "bad enum definition");
1055 base_type = &bad_ctype;
1056 }
1057 parent->ctype.base_type = base_type;
1058 }
1059 if (is_int_type(base_type)) {
1060 update_range(&range, lastval, ctype);
1061 }
1062 token = next;
1063
1064 sym->endpos = token->pos;
1065
1066 if (!match_op(token, ','))
1067 break;
1068 token = token->next;
1069 }
1070 if (!base_type) {
1071 sparse_error(token->pos, "empty enum definition");
1072 base_type = &bad_ctype;
1073 }
1074 else if (!is_int_type(base_type))
1075 ;
1076 else if (type_is_ok(&uint_ctype, range))
1077 base_type = &uint_ctype;
1078 else if (type_is_ok(&int_ctype, range))
1079 base_type = &int_ctype;
1080 else if (type_is_ok(&ulong_ctype, range))
1081 base_type = &ulong_ctype;
1082 else if (type_is_ok(&long_ctype, range))
1083 base_type = &long_ctype;
1084 else if (type_is_ok(&ullong_ctype, range))
1085 base_type = &ullong_ctype;
1086 else if (type_is_ok(&llong_ctype, range))
1087 base_type = &llong_ctype;
1088 else
1089 base_type = &bad_ctype;
1090 parent->ctype.base_type = base_type;
1091 parent->ctype.modifiers |= (base_type->ctype.modifiers & MOD_UNSIGNED);
1092 parent->examined = 0;
1093
1094 if (mix_bitwise)
1095 return token;
1096 cast_enum_list(parent->symbol_list, base_type);
1097
1098 return token;
1099 }
1100
1101 static struct token *enum_specifier(struct token *token, struct decl_state *ctx)
1102 {
1103 struct token *ret = struct_union_enum_specifier(SYM_ENUM, token, ctx, parse_enum_declaration);
1104 struct ctype *ctype = &ctx->ctype.base_type->ctype;
1105
1106 if (!ctype->base_type)
1107 ctype->base_type = &incomplete_ctype;
1108
1109 return ret;
1110 }
1111
1112 static struct token *typeof_specifier(struct token *token, struct decl_state *ctx)
1113 {
1114 struct symbol *sym;
1115
1116 if (!match_op(token, '(')) {
1117 sparse_error(token->pos, "expected '(' after typeof");
1118 return token;
1119 }
1120 if (lookup_type(token->next)) {
1121 token = typename(token->next, &sym, NULL);
1122 ctx->ctype.base_type = sym->ctype.base_type;
1123 apply_ctype(token->pos, &sym->ctype, &ctx->ctype);
1124 } else {
1125 struct symbol *typeof_sym = alloc_symbol(token->pos, SYM_TYPEOF);
1126 token = parse_expression(token->next, &typeof_sym->initializer);
1127
1128 typeof_sym->endpos = token->pos;
1129 if (!typeof_sym->initializer) {
1130 sparse_error(token->pos, "expected expression after the '(' token");
1131 typeof_sym = &bad_ctype;
1132 }
1133 ctx->ctype.base_type = typeof_sym;
1134 }
1135 return expect(token, ')', "after typeof");
1136 }
1137
1138 static struct token *autotype_specifier(struct token *token, struct decl_state *ctx)
1139 {
1140 ctx->ctype.base_type = &autotype_ctype;
1141 ctx->autotype = 1;
1142 return token;
1143 }
1144
1145 static struct token *ignore_attribute(struct token *token, struct symbol *attr, struct decl_state *ctx)
1146 {
1147 struct expression *expr = NULL;
1148 if (match_op(token, '('))
1149 token = parens_expression(token, &expr, "in attribute");
1150 return token;
1151 }
1152
1153 static struct token *attribute_packed(struct token *token, struct symbol *attr, struct decl_state *ctx)
1154 {
1155 if (!ctx->ctype.alignment)
1156 ctx->ctype.alignment = 1;
1157 return token;
1158 }
1159
1160 static struct token *attribute_aligned(struct token *token, struct symbol *attr, struct decl_state *ctx)
1161 {
1162 int alignment = max_alignment;
1163 struct expression *expr = NULL;
1164
1165 if (match_op(token, '(')) {
1166 token = parens_expression(token, &expr, "in attribute");
1167 if (expr)
1168 alignment = const_expression_value(expr);
1169 }
1170 if (alignment & (alignment-1)) {
1171 warning(token->pos, "I don't like non-power-of-2 alignments");
1172 return token;
1173 } else if (alignment > ctx->ctype.alignment)
1174 ctx->ctype.alignment = alignment;
1175 return token;
1176 }
1177
1178 static void apply_mod(struct position *pos, unsigned long *mods, unsigned long mod)
1179 {
1180 if (*mods & mod & ~MOD_DUP_OK)
1181 warning(*pos, "duplicate %s", modifier_string(mod));
1182 *mods |= mod;
1183 }
1184
1185 static void apply_qualifier(struct position *pos, struct ctype *ctx, unsigned long qual)
1186 {
1187 apply_mod(pos, &ctx->modifiers, qual);
1188 }
1189
1190 static struct token *attribute_modifier(struct token *token, struct symbol *attr, struct decl_state *ctx)
1191 {
1192 apply_qualifier(&token->pos, &ctx->ctype, attr->ctype.modifiers);
1193 return token;
1194 }
1195
1196 static struct token *attribute_function(struct token *token, struct symbol *attr, struct decl_state *ctx)
1197 {
1198 apply_mod(&token->pos, &ctx->f_modifiers, attr->ctype.modifiers);
1199 return token;
1200 }
1201
1202 static struct token *attribute_bitwise(struct token *token, struct symbol *attr, struct decl_state *ctx)
1203 {
1204 if (Wbitwise)
1205 attribute_modifier(token, attr, ctx);
1206 return token;
1207 }
1208
1209 static struct ident *numerical_address_space(int asn)
1210 {
1211 char buff[32];
1212
1213 if (!asn)
1214 return NULL;
1215 sprintf(buff, "<asn:%d>", asn);
1216 return built_in_ident(buff);
1217 }
1218
1219 static struct token *attribute_address_space(struct token *token, struct symbol *attr, struct decl_state *ctx)
1220 {
1221 struct expression *expr = NULL;
1222 struct ident *as = NULL;
1223 struct token *next;
1224
1225 token = expect(token, '(', "after address_space attribute");
1226 switch (token_type(token)) {
1227 case TOKEN_NUMBER:
1228 next = primary_expression(token, &expr);
1229 if (expr->type != EXPR_VALUE)
1230 goto invalid;
1231 as = numerical_address_space(expr->value);
1232 break;
1233 case TOKEN_IDENT:
1234 next = token->next;
1235 as = token->ident;
1236 break;
1237 default:
1238 next = token->next;
1239 invalid:
1240 as = NULL;
1241 warning(token->pos, "invalid address space name");
1242 }
1243
1244 if (Waddress_space && as) {
1245 if (ctx->ctype.as)
1246 sparse_error(token->pos,
1247 "multiple address space given: %s & %s",
1248 show_as(ctx->ctype.as), show_as(as));
1249 ctx->ctype.as = as;
1250 }
1251 token = expect(next, ')', "after address_space attribute");
1252 return token;
1253 }
1254
1255 static struct symbol *to_QI_mode(struct symbol *ctype)
1256 {
1257 if (ctype->ctype.base_type != &int_type)
1258 return NULL;
1259 if (ctype == &char_ctype)
1260 return ctype;
1261 return ctype->ctype.modifiers & MOD_UNSIGNED ? &uchar_ctype
1262 : &schar_ctype;
1263 }
1264
1265 static struct symbol *to_HI_mode(struct symbol *ctype)
1266 {
1267 if (ctype->ctype.base_type != &int_type)
1268 return NULL;
1269 return ctype->ctype.modifiers & MOD_UNSIGNED ? &ushort_ctype
1270 : &sshort_ctype;
1271 }
1272
1273 static struct symbol *to_SI_mode(struct symbol *ctype)
1274 {
1275 if (ctype->ctype.base_type != &int_type)
1276 return NULL;
1277 return ctype->ctype.modifiers & MOD_UNSIGNED ? &uint_ctype
1278 : &sint_ctype;
1279 }
1280
1281 static struct symbol *to_DI_mode(struct symbol *ctype)
1282 {
1283 if (ctype->ctype.base_type != &int_type)
1284 return NULL;
1285 return ctype->ctype.modifiers & MOD_UNSIGNED ? &ullong_ctype
1286 : &sllong_ctype;
1287 }
1288
1289 static struct symbol *to_TI_mode(struct symbol *ctype)
1290 {
1291 if (ctype->ctype.base_type != &int_type)
1292 return NULL;
1293 return ctype->ctype.modifiers & MOD_UNSIGNED ? &uint128_ctype
1294 : &sint128_ctype;
1295 }
1296
1297 static struct symbol *to_pointer_mode(struct symbol *ctype)
1298 {
1299 if (ctype->ctype.base_type != &int_type)
1300 return NULL;
1301 return ctype->ctype.modifiers & MOD_UNSIGNED ? uintptr_ctype
1302 : intptr_ctype;
1303 }
1304
1305 static struct symbol *to_word_mode(struct symbol *ctype)
1306 {
1307 if (ctype->ctype.base_type != &int_type)
1308 return NULL;
1309 return ctype->ctype.modifiers & MOD_UNSIGNED ? &ulong_ctype
1310 : &slong_ctype;
1311 }
1312
1313 static struct token *attribute_mode(struct token *token, struct symbol *attr, struct decl_state *ctx)
1314 {
1315 token = expect(token, '(', "after mode attribute");
1316 if (token_type(token) == TOKEN_IDENT) {
1317 struct symbol *mode = lookup_keyword(token->ident, NS_KEYWORD);
1318 if (mode && mode->op->type == KW_MODE)
1319 ctx->mode = mode->op;
1320 else
1321 sparse_error(token->pos, "unknown mode attribute %s", show_ident(token->ident));
1322 token = token->next;
1323 } else
1324 sparse_error(token->pos, "expect attribute mode symbol\n");
1325 token = expect(token, ')', "after mode attribute");
1326 return token;
1327 }
1328
1329 static struct token *attribute_context(struct token *token, struct symbol *attr, struct decl_state *ctx)
1330 {
1331 struct context *context = alloc_context();
1332 struct expression *args[3];
1333 int idx = 0;
1334
1335 token = expect(token, '(', "after context attribute");
1336 token = conditional_expression(token, &args[0]);
1337 token = expect(token, ',', "after context 1st argument");
1338 token = conditional_expression(token, &args[1]);
1339 if (match_op(token, ',')) {
1340 token = token->next;
1341 token = conditional_expression(token, &args[2]);
1342 token = expect(token, ')', "after context 3rd argument");
1343 context->context = args[0];
1344 idx++;
1345 } else {
1346 token = expect(token, ')', "after context 2nd argument");
1347 }
1348 context->in = get_expression_value(args[idx++]);
1349 context->out = get_expression_value(args[idx++]);
1350 add_ptr_list(&ctx->ctype.contexts, context);
1351 return token;
1352 }
1353
1354 static struct token *attribute_designated_init(struct token *token, struct symbol *attr, struct decl_state *ctx)
1355 {
1356 if (ctx->ctype.base_type && ctx->ctype.base_type->type == SYM_STRUCT)
1357 ctx->ctype.base_type->designated_init = 1;
1358 else
1359 warning(token->pos, "attribute designated_init applied to non-structure type");
1360 return token;
1361 }
1362
1363 static struct token *attribute_transparent_union(struct token *token, struct symbol *attr, struct decl_state *ctx)
1364 {
1365 if (Wtransparent_union)
1366 warning(token->pos, "attribute __transparent_union__");
1367
1368 if (ctx->ctype.base_type && ctx->ctype.base_type->type == SYM_UNION)
1369 ctx->ctype.base_type->transparent_union = 1;
1370 else
1371 warning(token->pos, "attribute __transparent_union__ applied to non-union type");
1372 return token;
1373 }
1374
1375 static struct token *recover_unknown_attribute(struct token *token)
1376 {
1377 struct expression *expr = NULL;
1378
1379 if (Wunknown_attribute)
1380 warning(token->pos, "unknown attribute '%s'", show_ident(token->ident));
1381 token = token->next;
1382 if (match_op(token, '('))
1383 token = parens_expression(token, &expr, "in attribute");
1384 return token;
1385 }
1386
1387 static struct token *attribute_specifier(struct token *token, struct decl_state *ctx)
1388 {
1389 token = expect(token, '(', "after attribute");
1390 token = expect(token, '(', "after attribute");
1391
1392 for (;;) {
1393 struct ident *attribute_name;
1394 struct symbol *attr;
1395
1396 if (eof_token(token))
1397 break;
1398 if (match_op(token, ';'))
1399 break;
1400 if (token_type(token) != TOKEN_IDENT)
1401 break;
1402 attribute_name = token->ident;
1403 attr = lookup_keyword(attribute_name, NS_KEYWORD);
1404 if (attr && attr->op->attribute)
1405 token = attr->op->attribute(token->next, attr, ctx);
1406 else
1407 token = recover_unknown_attribute(token);
1408
1409 if (!match_op(token, ','))
1410 break;
1411 token = token->next;
1412 }
1413
1414 token = expect(token, ')', "after attribute");
1415 token = expect(token, ')', "after attribute");
1416 return token;
1417 }
1418
1419 static const char *storage_class[] =
1420 {
1421 [STypedef] = "typedef",
1422 [SAuto] = "auto",
1423 [SExtern] = "extern",
1424 [SStatic] = "static",
1425 [SRegister] = "register",
1426 [SForced] = "[force]"
1427 };
1428
1429 static unsigned long decl_modifiers(struct decl_state *ctx)
1430 {
1431 static unsigned long mod[SMax] =
1432 {
1433 [SAuto] = MOD_AUTO,
1434 [SExtern] = MOD_EXTERN,
1435 [SStatic] = MOD_STATIC,
1436 [SRegister] = MOD_REGISTER
1437 };
1438 unsigned long mods = ctx->ctype.modifiers & MOD_DECLARE;
1439 ctx->ctype.modifiers &= ~MOD_DECLARE;
1440 return mod[ctx->storage_class] | mods;
1441 }
1442
1443 static void set_storage_class(struct position *pos, struct decl_state *ctx, int class)
1444 {
1445 int is_tls = ctx->ctype.modifiers & MOD_TLS;
1446 /* __thread can be used alone, or with extern or static */
1447 if (is_tls && (class != SStatic && class != SExtern)) {
1448 sparse_error(*pos, "__thread can only be used alone, or with "
1449 "extern or static");
1450 return;
1451 }
1452
1453 if (!ctx->storage_class) {
1454 ctx->storage_class = class;
1455 return;
1456 }
1457 if (ctx->storage_class == class)
1458 sparse_error(*pos, "duplicate %s", storage_class[class]);
1459 else
1460 sparse_error(*pos, "multiple storage classes");
1461 }
1462
1463 static struct token *typedef_specifier(struct token *next, struct decl_state *ctx)
1464 {
1465 set_storage_class(&next->pos, ctx, STypedef);
1466 return next;
1467 }
1468
1469 static struct token *auto_specifier(struct token *next, struct decl_state *ctx)
1470 {
1471 set_storage_class(&next->pos, ctx, SAuto);
1472 return next;
1473 }
1474
1475 static struct token *register_specifier(struct token *next, struct decl_state *ctx)
1476 {
1477 set_storage_class(&next->pos, ctx, SRegister);
1478 return next;
1479 }
1480
1481 static struct token *static_specifier(struct token *next, struct decl_state *ctx)
1482 {
1483 set_storage_class(&next->pos, ctx, SStatic);
1484 return next;
1485 }
1486
1487 static struct token *extern_specifier(struct token *next, struct decl_state *ctx)
1488 {
1489 set_storage_class(&next->pos, ctx, SExtern);
1490 return next;
1491 }
1492
1493 static struct token *thread_specifier(struct token *next, struct decl_state *ctx)
1494 {
1495 /* This GCC extension can be used alone, or with extern or static */
1496 if (!ctx->storage_class || ctx->storage_class == SStatic
1497 || ctx->storage_class == SExtern) {
1498 apply_qualifier(&next->pos, &ctx->ctype, MOD_TLS);
1499 } else {
1500 sparse_error(next->pos, "__thread can only be used alone, or "
1501 "with extern or static");
1502 }
1503
1504 return next;
1505 }
1506
1507 static struct token *attribute_force(struct token *token, struct symbol *attr, struct decl_state *ctx)
1508 {
1509 set_storage_class(&token->pos, ctx, SForced);
1510 return token;
1511 }
1512
1513 static struct token *inline_specifier(struct token *next, struct decl_state *ctx)
1514 {
1515 apply_qualifier(&next->pos, &ctx->ctype, MOD_INLINE);
1516 return next;
1517 }
1518
1519 static struct token *noreturn_specifier(struct token *next, struct decl_state *ctx)
1520 {
1521 apply_qualifier(&next->pos, &ctx->ctype, MOD_NORETURN);
1522 return next;
1523 }
1524
1525 static struct token *alignas_specifier(struct token *token, struct decl_state *ctx)
1526 {
1527 int alignment = 0;
1528
1529 if (!match_op(token, '(')) {
1530 sparse_error(token->pos, "expected '(' after _Alignas");
1531 return token;
1532 }
1533 if (lookup_type(token->next)) {
1534 struct symbol *sym = NULL;
1535 token = typename(token->next, &sym, NULL);
1536 sym = examine_symbol_type(sym);
1537 alignment = sym->ctype.alignment;
1538 token = expect(token, ')', "after _Alignas(...");
1539 } else {
1540 struct expression *expr = NULL;
1541 token = parens_expression(token, &expr, "after _Alignas");
1542 if (!expr)
1543 return token;
1544 alignment = const_expression_value(expr);
1545 }
1546
1547 if (alignment < 0) {
1548 warning(token->pos, "non-positive alignment");
1549 return token;
1550 }
1551 if (alignment & (alignment-1)) {
1552 warning(token->pos, "non-power-of-2 alignment");
1553 return token;
1554 }
1555 if (alignment > ctx->ctype.alignment)
1556 ctx->ctype.alignment = alignment;
1557 return token;
1558 }
1559
1560 static struct token *const_qualifier(struct token *next, struct decl_state *ctx)
1561 {
1562 apply_qualifier(&next->pos, &ctx->ctype, MOD_CONST);
1563 return next;
1564 }
1565
1566 static struct token *volatile_qualifier(struct token *next, struct decl_state *ctx)
1567 {
1568 apply_qualifier(&next->pos, &ctx->ctype, MOD_VOLATILE);
1569 return next;
1570 }
1571
1572 static struct token *restrict_qualifier(struct token *next, struct decl_state *ctx)
1573 {
1574 apply_qualifier(&next->pos, &ctx->ctype, MOD_RESTRICT);
1575 return next;
1576 }
1577
1578 static struct token *atomic_qualifier(struct token *next, struct decl_state *ctx)
1579 {
1580 apply_qualifier(&next->pos, &ctx->ctype, MOD_ATOMIC);
1581 return next;
1582 }
1583
1584 static void apply_ctype(struct position pos, struct ctype *thistype, struct ctype *ctype)
1585 {
1586 unsigned long mod = thistype->modifiers;
1587
1588 if (mod)
1589 apply_qualifier(&pos, ctype, mod);
1590
1591 /* Context */
1592 concat_ptr_list((struct ptr_list *)thistype->contexts,
1593 (struct ptr_list **)&ctype->contexts);
1594
1595 /* Alignment */
1596 if (thistype->alignment > ctype->alignment)
1597 ctype->alignment = thistype->alignment;
1598
1599 /* Address space */
1600 if (thistype->as)
1601 ctype->as = thistype->as;
1602 }
1603
1604 static void specifier_conflict(struct position pos, int what, struct ident *new)
1605 {
1606 const char *old;
1607 if (what & (Set_S | Set_T))
1608 goto Catch_all;
1609 if (what & Set_Char)
1610 old = "char";
1611 else if (what & Set_Double)
1612 old = "double";
1613 else if (what & Set_Float)
1614 old = "float";
1615 else if (what & Set_Signed)
1616 old = "signed";
1617 else if (what & Set_Unsigned)
1618 old = "unsigned";
1619 else if (what & Set_Short)
1620 old = "short";
1621 else if (what & Set_Long)
1622 old = "long";
1623 else
1624 old = "long long";
1625 sparse_error(pos, "impossible combination of type specifiers: %s %s",
1626 old, show_ident(new));
1627 return;
1628
1629 Catch_all:
1630 sparse_error(pos, "two or more data types in declaration specifiers");
1631 }
1632
1633 static struct symbol * const int_types[] =
1634 {&char_ctype, &short_ctype, &int_ctype, &long_ctype, &llong_ctype, &int128_ctype};
1635 static struct symbol * const signed_types[] =
1636 {&schar_ctype, &sshort_ctype, &sint_ctype, &slong_ctype, &sllong_ctype,
1637 &sint128_ctype};
1638 static struct symbol * const unsigned_types[] =
1639 {&uchar_ctype, &ushort_ctype, &uint_ctype, &ulong_ctype, &ullong_ctype,
1640 &uint128_ctype};
1641 static struct symbol * const real_types[] =
1642 {&float_ctype, &double_ctype, &ldouble_ctype};
1643 static struct symbol * const * const types[] = {
1644 [CInt] = int_types + 2,
1645 [CSInt] = signed_types + 2,
1646 [CUInt] = unsigned_types + 2,
1647 [CReal] = real_types + 1,
1648 };
1649
1650 struct symbol *ctype_integer(int size, int want_unsigned)
1651 {
1652 return types[want_unsigned ? CUInt : CInt][size];
1653 }
1654
1655 static struct token *handle_qualifiers(struct token *t, struct decl_state *ctx)
1656 {
1657 while (token_type(t) == TOKEN_IDENT) {
1658 struct symbol *s = lookup_symbol(t->ident, NS_TYPEDEF);
1659 if (!s)
1660 break;
1661 if (s->type != SYM_KEYWORD)
1662 break;
1663 if (!(s->op->type & (KW_ATTRIBUTE | KW_QUALIFIER)))
1664 break;
1665 t = t->next;
1666 if (s->op->declarator)
1667 t = s->op->declarator(t, ctx);
1668 }
1669 return t;
1670 }
1671
1672 static struct token *declaration_specifiers(struct token *token, struct decl_state *ctx)
1673 {
1674 int seen = 0;
1675 int class = CInt;
1676 int rank = 0;
1677
1678 while (token_type(token) == TOKEN_IDENT) {
1679 struct symbol *s = lookup_symbol(token->ident,
1680 NS_TYPEDEF | NS_SYMBOL);
1681 if (!s || !(s->namespace & NS_TYPEDEF))
1682 break;
1683 if (s->type != SYM_KEYWORD) {
1684 if (seen & Set_Any)
1685 break;
1686 seen |= Set_S | Set_T;
1687 ctx->ctype.base_type = s->ctype.base_type;
1688 apply_ctype(token->pos, &s->ctype, &ctx->ctype);
1689 token = token->next;
1690 continue;
1691 }
1692 if (s->op->type & KW_SPECIFIER) {
1693 if (seen & s->op->test) {
1694 specifier_conflict(token->pos,
1695 seen & s->op->test,
1696 token->ident);
1697 break;
1698 }
1699 seen |= s->op->set;
1700 class += s->op->class;
1701 if (s->op->set & Set_Int128)
1702 rank = 3;
1703 else if (s->op->set & Set_Char)
1704 rank = -2;
1705 if (s->op->set & (Set_Short|Set_Float)) {
1706 rank = -1;
1707 } else if (s->op->set & Set_Long && rank++) {
1708 if (class == CReal) {
1709 specifier_conflict(token->pos,
1710 Set_Vlong,
1711 &double_ident);
1712 break;
1713 }
1714 seen |= Set_Vlong;
1715 }
1716 }
1717 token = token->next;
1718 if (s->op->declarator) // Note: this eats attributes
1719 token = s->op->declarator(token, ctx);
1720 if (s->op->type & KW_EXACT) {
1721 ctx->ctype.base_type = s->ctype.base_type;
1722 ctx->ctype.modifiers |= s->ctype.modifiers;
1723 }
1724 }
1725
1726 if (!(seen & Set_S)) { /* not set explicitly? */
1727 struct symbol *base = &incomplete_ctype;
1728 if (seen & Set_Any)
1729 base = types[class][rank];
1730 ctx->ctype.base_type = base;
1731 }
1732
1733 if (ctx->ctype.modifiers & MOD_BITWISE) {
1734 struct symbol *type;
1735 ctx->ctype.modifiers &= ~MOD_BITWISE;
1736 if (!is_int_type(ctx->ctype.base_type)) {
1737 sparse_error(token->pos, "invalid modifier");
1738 return token;
1739 }
1740 type = alloc_symbol(token->pos, SYM_BASETYPE);
1741 *type = *ctx->ctype.base_type;
1742 type->ctype.modifiers &= ~MOD_SPECIFIER;
1743 type->ctype.base_type = ctx->ctype.base_type;
1744 type->type = SYM_RESTRICT;
1745 ctx->ctype.base_type = type;
1746 create_fouled(type);
1747 }
1748 return token;
1749 }
1750
1751 static struct token *abstract_array_static_declarator(struct token *token, int *has_static)
1752 {
1753 while (token->ident == &static_ident) {
1754 if (*has_static)
1755 sparse_error(token->pos, "duplicate array static declarator");
1756
1757 *has_static = 1;
1758 token = token->next;
1759 }
1760 return token;
1761
1762 }
1763
1764 static struct token *abstract_array_declarator(struct token *token, struct symbol *sym)
1765 {
1766 struct expression *expr = NULL;
1767 int has_static = 0;
1768
1769 token = abstract_array_static_declarator(token, &has_static);
1770
1771 if (match_idents(token, &restrict_ident, &__restrict_ident, &__restrict___ident, NULL))
1772 token = abstract_array_static_declarator(token->next, &has_static);
1773 token = parse_expression(token, &expr);
1774 sym->array_size = expr;
1775 return token;
1776 }
1777
1778 static struct token *parameter_type_list(struct token *, struct symbol *);
1779 static struct token *identifier_list(struct token *, struct symbol *);
1780 static struct token *declarator(struct token *token, struct decl_state *ctx);
1781
1782 static struct token *skip_attribute(struct token *token)
1783 {
1784 token = token->next;
1785 if (match_op(token, '(')) {
1786 int depth = 1;
1787 token = token->next;
1788 while (depth && !eof_token(token)) {
1789 if (token_type(token) == TOKEN_SPECIAL) {
1790 if (token->special == '(')
1791 depth++;
1792 else if (token->special == ')')
1793 depth--;
1794 }
1795 token = token->next;
1796 }
1797 }
1798 return token;
1799 }
1800
1801 static struct token *skip_attributes(struct token *token)
1802 {
1803 struct symbol *keyword;
1804 for (;;) {
1805 if (token_type(token) != TOKEN_IDENT)
1806 break;
1807 keyword = lookup_keyword(token->ident, NS_KEYWORD | NS_TYPEDEF);
1808 if (!keyword || keyword->type != SYM_KEYWORD)
1809 break;
1810 if (!(keyword->op->type & KW_ATTRIBUTE))
1811 break;
1812 token = expect(token->next, '(', "after attribute");
1813 token = expect(token, '(', "after attribute");
1814 for (;;) {
1815 if (eof_token(token))
1816 break;
1817 if (match_op(token, ';'))
1818 break;
1819 if (token_type(token) != TOKEN_IDENT)
1820 break;
1821 token = skip_attribute(token);
1822 if (!match_op(token, ','))
1823 break;
1824 token = token->next;
1825 }
1826 token = expect(token, ')', "after attribute");
1827 token = expect(token, ')', "after attribute");
1828 }
1829 return token;
1830 }
1831
1832 static struct token *handle_attributes(struct token *token, struct decl_state *ctx, unsigned int keywords)
1833 {
1834 struct symbol *keyword;
1835 for (;;) {
1836 if (token_type(token) != TOKEN_IDENT)
1837 break;
1838 keyword = lookup_keyword(token->ident, NS_KEYWORD | NS_TYPEDEF);
1839 if (!keyword || keyword->type != SYM_KEYWORD)
1840 break;
1841 if (!(keyword->op->type & keywords))
1842 break;
1843 token = keyword->op->declarator(token->next, ctx);
1844 keywords &= KW_ATTRIBUTE;
1845 }
1846 return token;
1847 }
1848
1849 static int is_nested(struct token *token, struct token **p,
1850 int prefer_abstract)
1851 {
1852 /*
1853 * This can be either a parameter list or a grouping.
1854 * For the direct (non-abstract) case, we know if must be
1855 * a parameter list if we already saw the identifier.
1856 * For the abstract case, we know if must be a parameter
1857 * list if it is empty or starts with a type.
1858 */
1859 struct token *next = token->next;
1860
1861 *p = next = skip_attributes(next);
1862
1863 if (token_type(next) == TOKEN_IDENT) {
1864 if (lookup_type(next))
1865 return !prefer_abstract;
1866 return 1;
1867 }
1868
1869 if (match_op(next, ')') || match_op(next, SPECIAL_ELLIPSIS))
1870 return 0;
1871
1872 return 1;
1873 }
1874
1875 enum kind {
1876 Empty, K_R, Proto, Bad_Func,
1877 };
1878
1879 static enum kind which_func(struct token *token,
1880 struct ident **n,
1881 int prefer_abstract)
1882 {
1883 struct token *next = token->next;
1884
1885 if (token_type(next) == TOKEN_IDENT) {
1886 if (lookup_type(next))
1887 return Proto;
1888 /* identifier list not in definition; complain */
1889 if (prefer_abstract)
1890 warning(token->pos,
1891 "identifier list not in definition");
1892 return K_R;
1893 }
1894
1895 if (token_type(next) != TOKEN_SPECIAL)
1896 return Bad_Func;
1897
1898 if (next->special == ')') {
1899 /* don't complain about those */
1900 if (!n || match_op(next->next, ';') || match_op(next->next, ','))
1901 return Empty;
1902 if (Wstrict_prototypes)
1903 warning(next->pos,
1904 "non-ANSI function declaration of function '%s'",
1905 show_ident(*n));
1906 return Empty;
1907 }
1908
1909 if (next->special == SPECIAL_ELLIPSIS) {
1910 warning(next->pos,
1911 "variadic functions must have one named argument");
1912 return Proto;
1913 }
1914
1915 return Bad_Func;
1916 }
1917
1918 static struct token *direct_declarator(struct token *token, struct decl_state *ctx)
1919 {
1920 struct ctype *ctype = &ctx->ctype;
1921 struct token *next;
1922 struct ident **p = ctx->ident;
1923
1924 if (ctx->ident && token_type(token) == TOKEN_IDENT) {
1925 *ctx->ident = token->ident;
1926 token = token->next;
1927 } else if (match_op(token, '(') &&
1928 is_nested(token, &next, ctx->prefer_abstract)) {
1929 struct symbol *base_type = ctype->base_type;
1930 if (token->next != next)
1931 next = handle_attributes(token->next, ctx,
1932 KW_ATTRIBUTE);
1933 token = declarator(next, ctx);
1934 token = expect(token, ')', "in nested declarator");
1935 while (ctype->base_type != base_type)
1936 ctype = &ctype->base_type->ctype;
1937 p = NULL;
1938 }
1939
1940 if (match_op(token, '(')) {
1941 enum kind kind = which_func(token, p, ctx->prefer_abstract);
1942 struct symbol *fn;
1943 fn = alloc_indirect_symbol(token->pos, ctype, SYM_FN);
1944 ctype->modifiers |= ctx->f_modifiers;
1945 token = token->next;
1946 if (kind == K_R)
1947 token = identifier_list(token, fn);
1948 else if (kind == Proto)
1949 token = parameter_type_list(token, fn);
1950 token = expect(token, ')', "in function declarator");
1951 fn->endpos = token->pos;
1952 return token;
1953 }
1954
1955 while (match_op(token, '[')) {
1956 struct symbol *array;
1957 array = alloc_indirect_symbol(token->pos, ctype, SYM_ARRAY);
1958 token = abstract_array_declarator(token->next, array);
1959 token = expect(token, ']', "in abstract_array_declarator");
1960 array->endpos = token->pos;
1961 ctype = &array->ctype;
1962 }
1963 return token;
1964 }
1965
1966 static struct token *pointer(struct token *token, struct decl_state *ctx)
1967 {
1968 while (match_op(token,'*')) {
1969 struct symbol *ptr = alloc_symbol(token->pos, SYM_PTR);
1970 ptr->ctype.modifiers = ctx->ctype.modifiers;
1971 ptr->ctype.base_type = ctx->ctype.base_type;
1972 ptr->ctype.as = ctx->ctype.as;
1973 ptr->ctype.contexts = ctx->ctype.contexts;
1974 ctx->ctype.modifiers = 0;
1975 ctx->ctype.base_type = ptr;
1976 ctx->ctype.as = NULL;
1977 ctx->ctype.contexts = NULL;
1978 ctx->ctype.alignment = 0;
1979
1980 token = handle_qualifiers(token->next, ctx);
1981 ctx->ctype.base_type->endpos = token->pos;
1982 }
1983 return token;
1984 }
1985
1986 static struct token *declarator(struct token *token, struct decl_state *ctx)
1987 {
1988 token = pointer(token, ctx);
1989 return direct_declarator(token, ctx);
1990 }
1991
1992 static struct token *handle_bitfield(struct token *token, struct decl_state *ctx)
1993 {
1994 struct ctype *ctype = &ctx->ctype;
1995 struct expression *expr;
1996 struct symbol *bitfield;
1997 long long width;
1998
1999 if (ctype->base_type != &int_type && !is_int_type(ctype->base_type)) {
2000 sparse_error(token->pos, "invalid bitfield specifier for type %s.",
2001 show_typename(ctype->base_type));
2002 // Parse this to recover gracefully.
2003 return conditional_expression(token->next, &expr);
2004 }
2005
2006 bitfield = alloc_indirect_symbol(token->pos, ctype, SYM_BITFIELD);
2007 token = conditional_expression(token->next, &expr);
2008 width = const_expression_value(expr);
2009 bitfield->bit_size = width;
2010
2011 if (width < 0 || width > INT_MAX || (*ctx->ident && width == 0)) {
2012 sparse_error(token->pos, "bitfield '%s' has invalid width (%lld)",
2013 show_ident(*ctx->ident), width);
2014 width = -1;
2015 } else if (*ctx->ident) {
2016 struct symbol *base_type = bitfield->ctype.base_type;
2017 struct symbol *bitfield_type = base_type == &int_type ? bitfield : base_type;
2018 int is_signed = !(bitfield_type->ctype.modifiers & MOD_UNSIGNED);
2019 if (Wone_bit_signed_bitfield && width == 1 && is_signed) {
2020 // Valid values are either {-1;0} or {0}, depending on integer
2021 // representation. The latter makes for very efficient code...
2022 sparse_error(token->pos, "dubious one-bit signed bitfield");
2023 }
2024 if (Wdefault_bitfield_sign &&
2025 bitfield_type->type != SYM_ENUM &&
2026 !(bitfield_type->ctype.modifiers & MOD_EXPLICITLY_SIGNED) &&
2027 is_signed) {
2028 // The sign of bitfields is unspecified by default.
2029 warning(token->pos, "dubious bitfield without explicit `signed' or `unsigned'");
2030 }
2031 }
2032 bitfield->bit_size = width;
2033 bitfield->endpos = token->pos;
2034 bitfield->ident = *ctx->ident;
2035 return token;
2036 }
2037
2038 static struct token *declaration_list(struct token *token, struct symbol_list **list)
2039 {
2040 struct decl_state ctx = {.prefer_abstract = 0};
2041 struct ctype saved;
2042 unsigned long mod;
2043
2044 token = declaration_specifiers(token, &ctx);
2045 mod = decl_modifiers(&ctx);
2046 saved = ctx.ctype;
2047 for (;;) {
2048 struct symbol *decl = alloc_symbol(token->pos, SYM_NODE);
2049 ctx.ident = &decl->ident;
2050
2051 token = declarator(token, &ctx);
2052 if (match_op(token, ':'))
2053 token = handle_bitfield(token, &ctx);
2054
2055 token = handle_attributes(token, &ctx, KW_ATTRIBUTE);
2056 apply_modifiers(token->pos, &ctx);
2057
2058 decl->ctype = ctx.ctype;
2059 decl->ctype.modifiers |= mod;
2060 decl->endpos = token->pos;
2061 add_symbol(list, decl);
2062 if (!match_op(token, ','))
2063 break;
2064 token = token->next;
2065 ctx.ctype = saved;
2066 }
2067 return token;
2068 }
2069
2070 static struct token *struct_declaration_list(struct token *token, struct symbol_list **list)
2071 {
2072 while (!match_op(token, '}')) {
2073 if (match_ident(token, &_Static_assert_ident)) {
2074 token = parse_static_assert(token, NULL);
2075 continue;
2076 }
2077 if (!match_op(token, ';'))
2078 token = declaration_list(token, list);
2079 if (!match_op(token, ';')) {
2080 sparse_error(token->pos, "expected ; at end of declaration");
2081 break;
2082 }
2083 token = token->next;
2084 }
2085 return token;
2086 }
2087
2088 static struct token *parameter_declaration(struct token *token, struct symbol *sym)
2089 {
2090 struct decl_state ctx = {.prefer_abstract = 1};
2091
2092 token = declaration_specifiers(token, &ctx);
2093 ctx.ident = &sym->ident;
2094 token = declarator(token, &ctx);
2095 token = handle_attributes(token, &ctx, KW_ATTRIBUTE);
2096 apply_modifiers(token->pos, &ctx);
2097 sym->ctype = ctx.ctype;
2098 sym->ctype.modifiers |= decl_modifiers(&ctx);
2099 sym->endpos = token->pos;
2100 sym->forced_arg = ctx.storage_class == SForced;
2101 return token;
2102 }
2103
2104 struct token *typename(struct token *token, struct symbol **p, int *forced)
2105 {
2106 struct decl_state ctx = {.prefer_abstract = 1};
2107 int class;
2108 struct symbol *sym = alloc_symbol(token->pos, SYM_NODE);
2109 *p = sym;
2110 token = declaration_specifiers(token, &ctx);
2111 token = declarator(token, &ctx);
2112 apply_modifiers(token->pos, &ctx);
2113 sym->ctype = ctx.ctype;
2114 sym->endpos = token->pos;
2115 class = ctx.storage_class;
2116 if (forced) {
2117 *forced = 0;
2118 if (class == SForced) {
2119 *forced = 1;
2120 class = 0;
2121 }
2122 }
2123 if (class)
2124 warning(sym->pos, "storage class in typename (%s %s)",
2125 storage_class[class], show_typename(sym));
2126 return token;
2127 }
2128
2129 static struct token *parse_underscore_Pragma(struct token *token)
2130 {
2131 struct token *next;
2132
2133 next = token->next;
2134 if (!match_op(next, '('))
2135 return next;
2136 next = next->next;
2137 if (next->pos.type != TOKEN_STRING)
2138 return next;
2139 next = next->next;
2140 if (!match_op(next, ')'))
2141 return next;
2142 return next->next;
2143 }
2144
2145 static struct token *expression_statement(struct token *token, struct expression **tree)
2146 {
2147 if (match_ident(token, &_Pragma_ident))
2148 return parse_underscore_Pragma(token);
2149
2150 token = parse_expression(token, tree);
2151 return expect(token, ';', "at end of statement");
2152 }
2153
2154 static struct token *parse_asm_operands(struct token *token, struct statement *stmt,
2155 struct asm_operand_list **inout)
2156 {
2157 /* Allow empty operands */
2158 if (match_op(token->next, ':') || match_op(token->next, ')'))
2159 return token->next;
2160 do {
2161 struct asm_operand *op = __alloc_asm_operand(0);
2162 if (match_op(token->next, '[') &&
2163 token_type(token->next->next) == TOKEN_IDENT &&
2164 match_op(token->next->next->next, ']')) {
2165 op->name = token->next->next->ident;
2166 token = token->next->next->next;
2167 }
2168 token = token->next;
2169 token = string_expression(token, &op->constraint, "asm constraint");
2170 token = parens_expression(token, &op->expr, "in asm parameter");
2171 add_ptr_list(inout, op);
2172 } while (match_op(token, ','));
2173 return token;
2174 }
2175
2176 static struct token *parse_asm_clobbers(struct token *token, struct statement *stmt,
2177 struct expression_list **clobbers)
2178 {
2179 struct expression *expr;
2180
2181 do {
2182 token = primary_expression(token->next, &expr);
2183 if (expr)
2184 add_expression(clobbers, expr);
2185 } while (match_op(token, ','));
2186 return token;
2187 }
2188
2189 static struct token *parse_asm_labels(struct token *token, struct statement *stmt,
2190 struct symbol_list **labels)
2191 {
2192 struct symbol *label;
2193
2194 do {
2195 token = token->next; /* skip ':' and ',' */
2196 if (token_type(token) != TOKEN_IDENT)
2197 return token;
2198 label = label_symbol(token, 1);
2199 add_symbol(labels, label);
2200 token = token->next;
2201 } while (match_op(token, ','));
2202 return token;
2203 }
2204
2205 static struct token *parse_asm_statement(struct token *token, struct statement *stmt)
2206 {
2207 unsigned long mods = 0;
2208
2209 token = token->next;
2210 stmt->type = STMT_ASM;
2211 while (token_type(token) == TOKEN_IDENT) {
2212 struct symbol *s = lookup_keyword(token->ident, NS_TYPEDEF);
2213 if (s && s->op && s->op->asm_modifier)
2214 s->op->asm_modifier(token, &mods);
2215 else if (token->ident == &goto_ident)
2216 asm_modifier(token, &mods, MOD_ASM_GOTO);
2217 token = token->next;
2218 }
2219 token = expect(token, '(', "after asm");
2220 token = string_expression(token, &stmt->asm_string, "inline asm");
2221 if (match_op(token, ':'))
2222 token = parse_asm_operands(token, stmt, &stmt->asm_outputs);
2223 if (match_op(token, ':'))
2224 token = parse_asm_operands(token, stmt, &stmt->asm_inputs);
2225 if (match_op(token, ':'))
2226 token = parse_asm_clobbers(token, stmt, &stmt->asm_clobbers);
2227 if (match_op(token, ':') && (mods & MOD_ASM_GOTO))
2228 token = parse_asm_labels(token, stmt, &stmt->asm_labels);
2229 token = expect(token, ')', "after asm");
2230 return expect(token, ';', "at end of asm-statement");
2231 }
2232
2233 static struct token *parse_asm_declarator(struct token *token, struct decl_state *ctx)
2234 {
2235 struct expression *expr;
2236 token = expect(token, '(', "after asm");
2237 token = string_expression(token, &expr, "inline asm");
2238 token = expect(token, ')', "after asm");
2239 return token;
2240 }
2241
2242 static struct token *parse_static_assert(struct token *token, struct symbol_list **unused)
2243 {
2244 struct expression *cond = NULL, *message = NULL;
2245
2246 token = expect(token->next, '(', "after _Static_assert");
2247 token = constant_expression(token, &cond);
2248 if (!cond)
2249 sparse_error(token->pos, "Expected constant expression");
2250 token = expect(token, ',', "after conditional expression in _Static_assert");
2251 token = string_expression(token, &message, "_Static_assert()");
2252 if (!message)
2253 cond = NULL;
2254 token = expect(token, ')', "after diagnostic message in _Static_assert");
2255
2256 token = expect(token, ';', "after _Static_assert()");
2257
2258 if (cond && !const_expression_value(cond) && cond->type == EXPR_VALUE)
2259 sparse_error(cond->pos, "static assertion failed: %s",
2260 show_string(message->string));
2261 return token;
2262 }
2263
2264 /* Make a statement out of an expression */
2265 static struct statement *make_statement(struct expression *expr)
2266 {
2267 struct statement *stmt;
2268
2269 if (!expr)
2270 return NULL;
2271 stmt = alloc_statement(expr->pos, STMT_EXPRESSION);
2272 stmt->expression = expr;
2273 return stmt;
2274 }
2275
2276 /*
2277 * All iterators have two symbols associated with them:
2278 * the "continue" and "break" symbols, which are targets
2279 * for continue and break statements respectively.
2280 *
2281 * They are in a special name-space, but they follow
2282 * all the normal visibility rules, so nested iterators
2283 * automatically work right.
2284 */
2285 static void start_iterator(struct statement *stmt)
2286 {
2287 struct symbol *cont, *brk;
2288
2289 start_block_scope(stmt->pos);
2290 cont = alloc_symbol(stmt->pos, SYM_NODE);
2291 bind_symbol(cont, &continue_ident, NS_ITERATOR);
2292 brk = alloc_symbol(stmt->pos, SYM_NODE);
2293 bind_symbol(brk, &break_ident, NS_ITERATOR);
2294
2295 stmt->type = STMT_ITERATOR;
2296 stmt->iterator_break = brk;
2297 stmt->iterator_continue = cont;
2298 fn_local_symbol(brk);
2299 fn_local_symbol(cont);
2300 }
2301
2302 static void end_iterator(struct statement *stmt)
2303 {
2304 end_block_scope();
2305 }
2306
2307 static struct statement *start_function(struct symbol *sym)
2308 {
2309 struct symbol *ret;
2310 struct statement *stmt = alloc_statement(sym->pos, STMT_COMPOUND);
2311
2312 start_function_scope(sym->pos);
2313 ret = alloc_symbol(sym->pos, SYM_NODE);
2314 ret->ctype = sym->ctype.base_type->ctype;
2315 ret->ctype.modifiers &= ~(MOD_STORAGE | MOD_QUALIFIER | MOD_TLS | MOD_ACCESS | MOD_NOCAST | MOD_NODEREF);
2316 ret->ctype.modifiers |= (MOD_AUTO | MOD_REGISTER);
2317 bind_symbol(ret, &return_ident, NS_ITERATOR);
2318 stmt->ret = ret;
2319 fn_local_symbol(ret);
2320
2321 // Currently parsed symbol for __func__/__FUNCTION__/__PRETTY_FUNCTION__
2322 current_fn = sym;
2323
2324 return stmt;
2325 }
2326
2327 static void end_function(struct symbol *sym)
2328 {
2329 current_fn = NULL;
2330 end_function_scope();
2331 }
2332
2333 /*
2334 * A "switch()" statement, like an iterator, has a
2335 * the "break" symbol associated with it. It works
2336 * exactly like the iterator break - it's the target
2337 * for any break-statements in scope, and means that
2338 * "break" handling doesn't even need to know whether
2339 * it's breaking out of an iterator or a switch.
2340 *
2341 * In addition, the "case" symbol is a marker for the
2342 * case/default statements to find the switch statement
2343 * that they are associated with.
2344 */
2345 static void start_switch(struct statement *stmt)
2346 {
2347 struct symbol *brk, *switch_case;
2348
2349 start_block_scope(stmt->pos);
2350 brk = alloc_symbol(stmt->pos, SYM_NODE);
2351 bind_symbol(brk, &break_ident, NS_ITERATOR);
2352
2353 switch_case = alloc_symbol(stmt->pos, SYM_NODE);
2354 bind_symbol(switch_case, &case_ident, NS_ITERATOR);
2355 switch_case->stmt = stmt;
2356
2357 stmt->type = STMT_SWITCH;
2358 stmt->switch_break = brk;
2359 stmt->switch_case = switch_case;
2360
2361 fn_local_symbol(brk);
2362 fn_local_symbol(switch_case);
2363 }
2364
2365 static void end_switch(struct statement *stmt)
2366 {
2367 if (!stmt->switch_case->symbol_list)
2368 warning(stmt->pos, "switch with no cases");
2369 end_block_scope();
2370 }
2371
2372 static void add_case_statement(struct statement *stmt)
2373 {
2374 struct symbol *target = lookup_symbol(&case_ident, NS_ITERATOR);
2375 struct symbol *sym;
2376
2377 if (!target) {
2378 sparse_error(stmt->pos, "not in switch scope");
2379 stmt->type = STMT_NONE;
2380 return;
2381 }
2382 sym = alloc_symbol(stmt->pos, SYM_NODE);
2383 add_symbol(&target->symbol_list, sym);
2384 sym->stmt = stmt;
2385 stmt->case_label = sym;
2386 fn_local_symbol(sym);
2387 }
2388
2389 static struct token *parse_return_statement(struct token *token, struct statement *stmt)
2390 {
2391 struct symbol *target = lookup_symbol(&return_ident, NS_ITERATOR);
2392
2393 if (!target)
2394 error_die(token->pos, "internal error: return without a function target");
2395 stmt->type = STMT_RETURN;
2396 stmt->ret_target = target;
2397 return expression_statement(token->next, &stmt->ret_value);
2398 }
2399
2400 static void validate_for_loop_decl(struct symbol *sym)
2401 {
2402 unsigned long storage = sym->ctype.modifiers & MOD_STORAGE;
2403
2404 if (storage & ~(MOD_AUTO | MOD_REGISTER)) {
2405 const char *name = show_ident(sym->ident);
2406 sparse_error(sym->pos, "non-local var '%s' in for-loop initializer", name);
2407 sym->ctype.modifiers &= ~MOD_STORAGE;
2408 }
2409 }
2410
2411 static struct token *parse_for_statement(struct token *token, struct statement *stmt)
2412 {
2413 struct symbol_list *syms;
2414 struct expression *e1, *e2, *e3;
2415 struct statement *iterator;
2416
2417 start_iterator(stmt);
2418 token = expect(token->next, '(', "after 'for'");
2419
2420 syms = NULL;
2421 e1 = NULL;
2422 /* C99 variable declaration? */
2423 if (lookup_type(token)) {
2424 token = external_declaration(token, &syms, validate_for_loop_decl);
2425 } else {
2426 token = parse_expression(token, &e1);
2427 token = expect(token, ';', "in 'for'");
2428 }
2429 token = parse_expression(token, &e2);
2430 token = expect(token, ';', "in 'for'");
2431 token = parse_expression(token, &e3);
2432 token = expect(token, ')', "in 'for'");
2433 token = statement(token, &iterator);
2434
2435 stmt->iterator_syms = syms;
2436 stmt->iterator_pre_statement = make_statement(e1);
2437 stmt->iterator_pre_condition = e2;
2438 stmt->iterator_post_statement = make_statement(e3);
2439 stmt->iterator_post_condition = NULL;
2440 stmt->iterator_statement = iterator;
2441 end_iterator(stmt);
2442
2443 return token;
2444 }
2445
2446 static struct token *parse_while_statement(struct token *token, struct statement *stmt)
2447 {
2448 struct expression *expr;
2449 struct statement *iterator;
2450
2451 start_iterator(stmt);
2452 token = parens_expression(token->next, &expr, "after 'while'");
2453 token = statement(token, &iterator);
2454
2455 stmt->iterator_pre_condition = expr;
2456 stmt->iterator_post_condition = NULL;
2457 stmt->iterator_statement = iterator;
2458 end_iterator(stmt);
2459
2460 return token;
2461 }
2462
2463 static struct token *parse_do_statement(struct token *token, struct statement *stmt)
2464 {
2465 struct expression *expr;
2466 struct statement *iterator;
2467
2468 start_iterator(stmt);
2469 token = statement(token->next, &iterator);
2470 if (token_type(token) == TOKEN_IDENT && token->ident == &while_ident)
2471 token = token->next;
2472 else
2473 sparse_error(token->pos, "expected 'while' after 'do'");
2474 token = parens_expression(token, &expr, "after 'do-while'");
2475
2476 stmt->iterator_post_condition = expr;
2477 stmt->iterator_statement = iterator;
2478 end_iterator(stmt);
2479
2480 if (iterator && iterator->type != STMT_COMPOUND && Wdo_while)
2481 warning(iterator->pos, "do-while statement is not a compound statement");
2482
2483 return expect(token, ';', "after statement");
2484 }
2485
2486 static struct token *parse_if_statement(struct token *token, struct statement *stmt)
2487 {
2488 stmt->type = STMT_IF;
2489 token = parens_expression(token->next, &stmt->if_conditional, "after if");
2490 token = statement(token, &stmt->if_true);
2491 if (token_type(token) != TOKEN_IDENT)
2492 return token;
2493 if (token->ident != &else_ident)
2494 return token;
2495 return statement(token->next, &stmt->if_false);
2496 }
2497
2498 static inline struct token *case_statement(struct token *token, struct statement *stmt)
2499 {
2500 stmt->type = STMT_CASE;
2501 token = expect(token, ':', "after default/case");
2502 add_case_statement(stmt);
2503 return statement(token, &stmt->case_statement);
2504 }
2505
2506 static struct token *parse_case_statement(struct token *token, struct statement *stmt)
2507 {
2508 token = parse_expression(token->next, &stmt->case_expression);
2509 if (match_op(token, SPECIAL_ELLIPSIS))
2510 token = parse_expression(token->next, &stmt->case_to);
2511 return case_statement(token, stmt);
2512 }
2513
2514 static struct token *parse_default_statement(struct token *token, struct statement *stmt)
2515 {
2516 return case_statement(token->next, stmt);
2517 }
2518
2519 static struct token *parse_loop_iterator(struct token *token, struct statement *stmt)
2520 {
2521 struct symbol *target = lookup_symbol(token->ident, NS_ITERATOR);
2522 stmt->type = STMT_GOTO;
2523 stmt->goto_label = target;
2524 if (!target)
2525 sparse_error(stmt->pos, "break/continue not in iterator scope");
2526 return expect(token->next, ';', "at end of statement");
2527 }
2528
2529 static struct token *parse_switch_statement(struct token *token, struct statement *stmt)
2530 {
2531 stmt->type = STMT_SWITCH;
2532 start_switch(stmt);
2533 token = parens_expression(token->next, &stmt->switch_expression, "after 'switch'");
2534 token = statement(token, &stmt->switch_statement);
2535 end_switch(stmt);
2536 return token;
2537 }
2538
2539 static void warn_label_usage(struct position def, struct position use, struct ident *ident)
2540 {
2541 const char *id = show_ident(ident);
2542 sparse_error(use, "label '%s' used outside statement expression", id);
2543 info(def, " label '%s' defined here", id);
2544 current_fn->bogus_linear = 1;
2545 }
2546
2547 void check_label_usage(struct symbol *label, struct position use_pos)
2548 {
2549 struct statement *def = label->stmt;
2550
2551 if (def) {
2552 if (!is_in_scope(def->label_scope, label_scope))
2553 warn_label_usage(def->pos, use_pos, label->ident);
2554 } else if (!label->label_scope) {
2555 label->label_scope = label_scope;
2556 label->label_pos = use_pos;
2557 }
2558 }
2559
2560 static struct token *parse_goto_statement(struct token *token, struct statement *stmt)
2561 {
2562 stmt->type = STMT_GOTO;
2563 token = token->next;
2564 if (match_op(token, '*')) {
2565 token = parse_expression(token->next, &stmt->goto_expression);
2566 add_statement(&function_computed_goto_list, stmt);
2567 } else if (token_type(token) == TOKEN_IDENT) {
2568 struct symbol *label = label_symbol(token, 1);
2569 stmt->goto_label = label;
2570 check_label_usage(label, stmt->pos);
2571 token = token->next;
2572 } else {
2573 sparse_error(token->pos, "Expected identifier or goto expression");
2574 }
2575 return expect(token, ';', "at end of statement");
2576 }
2577
2578 static struct token *parse_context_statement(struct token *token, struct statement *stmt)
2579 {
2580 stmt->type = STMT_CONTEXT;
2581 token = token->next;
2582 token = expect(token, '(', "after __context__ statement");
2583 token = assignment_expression(token, &stmt->expression);
2584 if (!stmt->expression)
2585 unexpected(token, "expression expected after '('");
2586 if (match_op(token, ',')) {
2587 token = token->next;
2588 stmt->context = stmt->expression;
2589 token = assignment_expression(token, &stmt->expression);
2590 if (!stmt->expression)
2591 unexpected(token, "expression expected after ','");
2592 }
2593 token = expect(token, ')', "at end of __context__ statement");
2594 return expect(token, ';', "at end of statement");
2595 }
2596
2597 static struct token *parse_range_statement(struct token *token, struct statement *stmt)
2598 {
2599 stmt->type = STMT_RANGE;
2600 token = token->next;
2601 token = expect(token, '(', "after __range__ statement");
2602 token = assignment_expression(token, &stmt->range_expression);
2603 token = expect(token, ',', "after range expression");
2604 token = assignment_expression(token, &stmt->range_low);
2605 token = expect(token, ',', "after low range");
2606 token = assignment_expression(token, &stmt->range_high);
2607 token = expect(token, ')', "after range statement");
2608 return expect(token, ';', "after range statement");
2609 }
2610
2611 static struct token *handle_label_attributes(struct token *token, struct symbol *label)
2612 {
2613 struct decl_state ctx = { };
2614
2615 token = handle_attributes(token, &ctx, KW_ATTRIBUTE);
2616 label->label_modifiers = ctx.ctype.modifiers;
2617 return token;
2618 }
2619
2620 static struct token *statement(struct token *token, struct statement **tree)
2621 {
2622 struct statement *stmt = alloc_statement(token->pos, STMT_NONE);
2623
2624 *tree = stmt;
2625 if (token_type(token) == TOKEN_IDENT) {
2626 struct symbol *s = lookup_keyword(token->ident, NS_KEYWORD);
2627 if (s && s->op->statement)
2628 return s->op->statement(token, stmt);
2629
2630 if (match_op(token->next, ':')) {
2631 struct symbol *s = label_symbol(token, 0);
2632 token = handle_label_attributes(token->next->next, s);
2633 if (s->stmt) {
2634 sparse_error(stmt->pos, "label '%s' redefined", show_ident(s->ident));
2635 // skip the label to avoid multiple definitions
2636 return statement(token, tree);
2637 }
2638 stmt->type = STMT_LABEL;
2639 stmt->label_identifier = s;
2640 stmt->label_scope = label_scope;
2641 if (s->label_scope) {
2642 if (!is_in_scope(label_scope, s->label_scope))
2643 warn_label_usage(stmt->pos, s->label_pos, s->ident);
2644 }
2645 s->stmt = stmt;
2646 return statement(token, &stmt->label_statement);
2647 }
2648 }
2649
2650 if (match_op(token, '{')) {
2651 token = compound_statement(token->next, stmt);
2652 return expect(token, '}', "at end of compound statement");
2653 }
2654
2655 stmt->type = STMT_EXPRESSION;
2656 return expression_statement(token, &stmt->expression);
2657 }
2658
2659 /* gcc extension - __label__ ident-list; in the beginning of compound stmt */
2660 static struct token *label_statement(struct token *token)
2661 {
2662 while (token_type(token) == TOKEN_IDENT) {
2663 struct symbol *sym = alloc_symbol(token->pos, SYM_LABEL);
2664 /* it's block-scope, but we want label namespace */
2665 bind_symbol_with_scope(sym, token->ident, NS_LABEL, block_scope);
2666 fn_local_symbol(sym);
2667 token = token->next;
2668 if (!match_op(token, ','))
2669 break;
2670 token = token->next;
2671 }
2672 return expect(token, ';', "at end of label declaration");
2673 }
2674
2675 static struct token * statement_list(struct token *token, struct statement_list **list)
2676 {
2677 int seen_statement = 0;
2678 while (token_type(token) == TOKEN_IDENT &&
2679 token->ident == &__label___ident)
2680 token = label_statement(token->next);
2681 for (;;) {
2682 struct statement * stmt;
2683 if (eof_token(token))
2684 break;
2685 if (match_op(token, '}'))
2686 break;
2687 if (match_ident(token, &_Static_assert_ident)) {
2688 token = parse_static_assert(token, NULL);
2689 continue;
2690 }
2691 if (lookup_type(token)) {
2692 if (seen_statement) {
2693 warning(token->pos, "mixing declarations and code");
2694 seen_statement = 0;
2695 }
2696 stmt = alloc_statement(token->pos, STMT_DECLARATION);
2697 token = external_declaration(token, &stmt->declaration, NULL);
2698 } else {
2699 seen_statement = Wdeclarationafterstatement;
2700 token = statement(token, &stmt);
2701 }
2702 add_statement(list, stmt);
2703 }
2704 return token;
2705 }
2706
2707 static struct token *identifier_list(struct token *token, struct symbol *fn)
2708 {
2709 struct symbol_list **list = &fn->arguments;
2710 for (;;) {
2711 struct symbol *sym = alloc_symbol(token->pos, SYM_NODE);
2712 sym->ident = token->ident;
2713 token = token->next;
2714 sym->endpos = token->pos;
2715 sym->ctype.base_type = &incomplete_ctype;
2716 add_symbol(list, sym);
2717 if (!match_op(token, ',') ||
2718 token_type(token->next) != TOKEN_IDENT ||
2719 lookup_type(token->next))
2720 break;
2721 token = token->next;
2722 }
2723 return token;
2724 }
2725
2726 static struct token *parameter_type_list(struct token *token, struct symbol *fn)
2727 {
2728 struct symbol_list **list = &fn->arguments;
2729
2730 for (;;) {
2731 struct symbol *sym;
2732
2733 if (match_op(token, SPECIAL_ELLIPSIS)) {
2734 fn->variadic = 1;
2735 token = token->next;
2736 break;
2737 }
2738
2739 sym = alloc_symbol(token->pos, SYM_NODE);
2740 token = parameter_declaration(token, sym);
2741 if (sym->ctype.base_type == &void_ctype) {
2742 /* Special case: (void) */
2743 if (!*list && !sym->ident)
2744 break;
2745 warning(token->pos, "void parameter");
2746 }
2747 add_symbol(list, sym);
2748 if (!match_op(token, ','))
2749 break;
2750 token = token->next;
2751 }
2752 return token;
2753 }
2754
2755 struct token *compound_statement(struct token *token, struct statement *stmt)
2756 {
2757 stmt->type = STMT_COMPOUND;
2758 start_block_scope(token->pos);
2759 token = statement_list(token, &stmt->stmts);
2760 end_block_scope();
2761 return token;
2762 }
2763
2764 static struct expression *identifier_expression(struct token *token)
2765 {
2766 struct expression *expr = alloc_expression(token->pos, EXPR_IDENTIFIER);
2767 expr->expr_ident = token->ident;
2768 return expr;
2769 }
2770
2771 static struct expression *index_expression(struct expression *from, struct expression *to)
2772 {
2773 int idx_from, idx_to;
2774 struct expression *expr = alloc_expression(from->pos, EXPR_INDEX);
2775
2776 idx_from = const_expression_value(from);
2777 idx_to = idx_from;
2778 if (to) {
2779 idx_to = const_expression_value(to);
2780 if (idx_to < idx_from || idx_from < 0)
2781 warning(from->pos, "nonsense array initializer index range");
2782 }
2783 expr->idx_from = idx_from;
2784 expr->idx_to = idx_to;
2785 return expr;
2786 }
2787
2788 static struct token *single_initializer(struct expression **ep, struct token *token)
2789 {
2790 int expect_equal = 0;
2791 struct token *next = token->next;
2792 struct expression **tail = ep;
2793 int nested;
2794
2795 *ep = NULL;
2796
2797 if ((token_type(token) == TOKEN_IDENT) && match_op(next, ':')) {
2798 struct expression *expr = identifier_expression(token);
2799 if (Wold_initializer)
2800 warning(token->pos, "obsolete struct initializer, use C99 syntax");
2801 token = initializer(&expr->ident_expression, next->next);
2802 if (expr->ident_expression)
2803 *ep = expr;
2804 return token;
2805 }
2806
2807 for (tail = ep, nested = 0; ; nested++, next = token->next) {
2808 if (match_op(token, '.') && (token_type(next) == TOKEN_IDENT)) {
2809 struct expression *expr = identifier_expression(next);
2810 *tail = expr;
2811 tail = &expr->ident_expression;
2812 expect_equal = 1;
2813 token = next->next;
2814 } else if (match_op(token, '[')) {
2815 struct expression *from = NULL, *to = NULL, *expr;
2816 token = constant_expression(token->next, &from);
2817 if (!from) {
2818 sparse_error(token->pos, "Expected constant expression");
2819 break;
2820 }
2821 if (match_op(token, SPECIAL_ELLIPSIS))
2822 token = constant_expression(token->next, &to);
2823 expr = index_expression(from, to);
2824 *tail = expr;
2825 tail = &expr->idx_expression;
2826 token = expect(token, ']', "at end of initializer index");
2827 if (nested)
2828 expect_equal = 1;
2829 } else {
2830 break;
2831 }
2832 }
2833 if (nested && !expect_equal) {
2834 if (!match_op(token, '='))
2835 warning(token->pos, "obsolete array initializer, use C99 syntax");
2836 else
2837 expect_equal = 1;
2838 }
2839 if (expect_equal)
2840 token = expect(token, '=', "at end of initializer index");
2841
2842 token = initializer(tail, token);
2843 if (!*tail)
2844 *ep = NULL;
2845 return token;
2846 }
2847
2848 static struct token *initializer_list(struct expression_list **list, struct token *token)
2849 {
2850 struct expression *expr;
2851
2852 for (;;) {
2853 token = single_initializer(&expr, token);
2854 if (!expr)
2855 break;
2856 add_expression(list, expr);
2857 if (!match_op(token, ','))
2858 break;
2859 token = token->next;
2860 }
2861 return token;
2862 }
2863
2864 struct token *initializer(struct expression **tree, struct token *token)
2865 {
2866 if (match_op(token, '{')) {
2867 struct expression *expr = alloc_expression(token->pos, EXPR_INITIALIZER);
2868 *tree = expr;
2869 if (!Wuniversal_initializer) {
2870 struct token *next = token->next;
2871 // '{ 0 }' is equivalent to '{ }' except for some
2872 // warnings, like using 0 to initialize a null-pointer.
2873 if (match_token_zero(next)) {
2874 if (match_op(next->next, '}'))
2875 expr->zero_init = 1;
2876 }
2877 }
2878
2879 token = initializer_list(&expr->expr_list, token->next);
2880 return expect(token, '}', "at end of initializer");
2881 }
2882 return assignment_expression(token, tree);
2883 }
2884
2885 static void declare_argument(struct symbol *sym, struct symbol *fn)
2886 {
2887 if (!sym->ident) {
2888 sparse_error(sym->pos, "no identifier for function argument");
2889 return;
2890 }
2891 bind_symbol(sym, sym->ident, NS_SYMBOL);
2892 }
2893
2894 static int is_syscall(struct symbol *sym)
2895 {
2896 char *macro;
2897 char *name;
2898 int is_syscall = 0;
2899
2900 macro = get_macro_name(sym->pos);
2901 if (macro &&
2902 (strncmp("SYSCALL_DEFINE", macro, strlen("SYSCALL_DEFINE")) == 0 ||
2903 strncmp("COMPAT_SYSCALL_DEFINE", macro, strlen("COMPAT_SYSCALL_DEFINE")) == 0))
2904 is_syscall = 1;
2905
2906 name = sym->ident->name;
2907
2908 if (name && strncmp(name, "sys_", 4) ==0)
2909 is_syscall = 1;
2910
2911 if (name && strncmp(name, "compat_sys_", 11) == 0)
2912 is_syscall = 1;
2913
2914 return is_syscall;
2915 }
2916
2917
2918 static struct token *parse_function_body(struct token *token, struct symbol *decl,
2919 struct symbol_list **list)
2920 {
2921 struct symbol_list **old_symbol_list;
2922 struct symbol *base_type = decl->ctype.base_type;
2923 struct statement *stmt, **p;
2924 struct symbol *prev;
2925 struct symbol *arg;
2926
2927 old_symbol_list = function_symbol_list;
2928 if (decl->ctype.modifiers & MOD_INLINE) {
2929 function_symbol_list = &decl->inline_symbol_list;
2930 p = &base_type->inline_stmt;
2931 } else {
2932 function_symbol_list = &decl->symbol_list;
2933 p = &base_type->stmt;
2934 }
2935 function_computed_target_list = NULL;
2936 function_computed_goto_list = NULL;
2937
2938 if ((decl->ctype.modifiers & (MOD_EXTERN|MOD_INLINE)) == MOD_EXTERN) {
2939 if (Wexternal_function_has_definition)
2940 warning(decl->pos, "function '%s' with external linkage has definition", show_ident(decl->ident));
2941 }
2942 if (!(decl->ctype.modifiers & MOD_STATIC))
2943 decl->ctype.modifiers |= MOD_EXTERN;
2944
2945 stmt = start_function(decl);
2946 *p = stmt;
2947
2948 FOR_EACH_PTR (base_type->arguments, arg) {
2949 declare_argument(arg, base_type);
2950 } END_FOR_EACH_PTR(arg);
2951
2952 token = statement_list(token->next, &stmt->stmts);
2953 end_function(decl);
2954
2955 if (!(decl->ctype.modifiers & MOD_INLINE))
2956 add_symbol(list, decl);
2957 else if (is_syscall(decl)) {
2958 add_symbol(list, decl);
2959 /*
2960 printf("parse.c decl: %s\n", decl->ident->name);
2961 char *macro = get_macro_name(decl->pos);
2962 printf("decl macro: %s\n", macro);
2963 */
2964 }
2965 check_declaration(decl);
2966 decl->definition = decl;
2967 prev = decl->same_symbol;
2968 if (prev && prev->definition) {
2969 warning(decl->pos, "multiple definitions for function '%s'",
2970 show_ident(decl->ident));
2971 info(prev->definition->pos, " the previous one is here");
2972 } else {
2973 while (prev) {
2974 rebind_scope(prev, decl->scope);
2975 prev->definition = decl;
2976 prev = prev->same_symbol;
2977 }
2978 }
2979 function_symbol_list = old_symbol_list;
2980 if (function_computed_goto_list) {
2981 if (!function_computed_target_list)
2982 warning(decl->pos, "function '%s' has computed goto but no targets?", show_ident(decl->ident));
2983 else {
2984 FOR_EACH_PTR(function_computed_goto_list, stmt) {
2985 stmt->target_list = function_computed_target_list;
2986 } END_FOR_EACH_PTR(stmt);
2987 }
2988 }
2989 return expect(token, '}', "at end of function");
2990 }
2991
2992 static void promote_k_r_types(struct symbol *arg)
2993 {
2994 struct symbol *base = arg->ctype.base_type;
2995 if (base && base->ctype.base_type == &int_type && base->rank < 0) {
2996 arg->ctype.base_type = &int_ctype;
2997 }
2998 }
2999
3000 static void apply_k_r_types(struct symbol_list *argtypes, struct symbol *fn)
3001 {
3002 struct symbol_list *real_args = fn->ctype.base_type->arguments;
3003 struct symbol *arg;
3004
3005 FOR_EACH_PTR(real_args, arg) {
3006 struct symbol *type;
3007
3008 /* This is quadratic in the number of arguments. We _really_ don't care */
3009 FOR_EACH_PTR(argtypes, type) {
3010 if (type->ident == arg->ident)
3011 goto match;
3012 } END_FOR_EACH_PTR(type);
3013 if (Wimplicit_int) {
3014 sparse_error(arg->pos, "missing type declaration for parameter '%s'",
3015 show_ident(arg->ident));
3016 }
3017 type = alloc_symbol(arg->pos, SYM_NODE);
3018 type->ident = arg->ident;
3019 type->ctype.base_type = &int_ctype;
3020 match:
3021 type->used = 1;
3022 /* "char" and "short" promote to "int" */
3023 promote_k_r_types(type);
3024
3025 arg->ctype = type->ctype;
3026 } END_FOR_EACH_PTR(arg);
3027
3028 FOR_EACH_PTR(argtypes, arg) {
3029 if (!arg->used)
3030 warning(arg->pos, "nonsensical parameter declaration '%s'", show_ident(arg->ident));
3031 } END_FOR_EACH_PTR(arg);
3032
3033 }
3034
3035 static struct token *parse_k_r_arguments(struct token *token, struct symbol *decl,
3036 struct symbol_list **list)
3037 {
3038 struct symbol_list *args = NULL;
3039
3040 if (Wold_style_definition)
3041 warning(token->pos, "non-ANSI definition of function '%s'", show_ident(decl->ident));
3042
3043 do {
3044 token = declaration_list(token, &args);
3045 if (!match_op(token, ';')) {
3046 sparse_error(token->pos, "expected ';' at end of parameter declaration");
3047 break;
3048 }
3049 token = token->next;
3050 } while (lookup_type(token));
3051
3052 apply_k_r_types(args, decl);
3053
3054 if (!match_op(token, '{')) {
3055 sparse_error(token->pos, "expected function body");
3056 return token;
3057 }
3058 return parse_function_body(token, decl, list);
3059 }
3060
3061 static struct token *toplevel_asm_declaration(struct token *token, struct symbol_list **list)
3062 {
3063 struct symbol *anon = alloc_symbol(token->pos, SYM_NODE);
3064 struct symbol *fn = alloc_symbol(token->pos, SYM_FN);
3065 struct statement *stmt;
3066
3067 anon->ctype.base_type = fn;
3068 stmt = alloc_statement(token->pos, STMT_NONE);
3069 fn->stmt = stmt;
3070
3071 token = parse_asm_statement(token, stmt);
3072
3073 // FIXME: add_symbol(list, anon);
3074 return token;
3075 }
3076
3077 struct token *external_declaration(struct token *token, struct symbol_list **list,
3078 validate_decl_t validate_decl)
3079 {
3080 struct ident *ident = NULL;
3081 struct symbol *decl;
3082 struct decl_state ctx = { .ident = &ident };
3083 struct ctype saved;
3084 struct symbol *base_type;
3085 unsigned long mod;
3086 int is_typedef;
3087
3088 if (match_ident(token, &_Pragma_ident))
3089 return parse_underscore_Pragma(token);
3090
3091 /* Top-level inline asm or static assertion? */
3092 if (token_type(token) == TOKEN_IDENT) {
3093 struct symbol *s = lookup_keyword(token->ident, NS_KEYWORD);
3094 if (s && s->op->toplevel)
3095 return s->op->toplevel(token, list);
3096 }
3097
3098 /* Parse declaration-specifiers, if any */
3099 token = declaration_specifiers(token, &ctx);
3100 mod = decl_modifiers(&ctx);
3101 decl = alloc_symbol(token->pos, SYM_NODE);
3102 /* Just a type declaration? */
3103 if (match_op(token, ';')) {
3104 apply_modifiers(token->pos, &ctx);
3105 return token->next;
3106 }
3107
3108 saved = ctx.ctype;
3109 token = declarator(token, &ctx);
3110 token = handle_attributes(token, &ctx, KW_ATTRIBUTE | KW_ASM);
3111 apply_modifiers(token->pos, &ctx);
3112
3113 decl->ctype = ctx.ctype;
3114 decl->ctype.modifiers |= mod;
3115 decl->endpos = token->pos;
3116
3117 /* Just a type declaration? */
3118 if (!ident) {
3119 warning(token->pos, "missing identifier in declaration");
3120 return expect(token, ';', "at the end of type declaration");
3121 }
3122
3123 /* type define declaration? */
3124 is_typedef = ctx.storage_class == STypedef;
3125
3126 /* Typedefs don't have meaningful storage */
3127 if (is_typedef)
3128 decl->ctype.modifiers |= MOD_USERTYPE;
3129
3130 bind_symbol(decl, ident, is_typedef ? NS_TYPEDEF: NS_SYMBOL);
3131
3132 base_type = decl->ctype.base_type;
3133
3134 if (is_typedef) {
3135 if (base_type && !base_type->ident) {
3136 switch (base_type->type) {
3137 case SYM_STRUCT:
3138 case SYM_UNION:
3139 case SYM_ENUM:
3140 case SYM_RESTRICT:
3141 base_type->ident = ident;
3142 break;
3143 default:
3144 break;
3145 }
3146 }
3147 } else if (base_type && base_type->type == SYM_FN) {
3148 if (base_type->ctype.base_type == &autotype_ctype) {
3149 sparse_error(decl->pos, "'%s()' has __auto_type return type",
3150 show_ident(decl->ident));
3151 base_type->ctype.base_type = &int_ctype;
3152 }
3153 if (base_type->ctype.base_type == &incomplete_ctype) {
3154 warning(decl->pos, "'%s()' has implicit return type",
3155 show_ident(decl->ident));
3156 base_type->ctype.base_type = &int_ctype;
3157 }
3158 /* apply attributes placed after the declarator */
3159 decl->ctype.modifiers |= ctx.f_modifiers;
3160
3161 /* K&R argument declaration? */
3162 if (lookup_type(token))
3163 return parse_k_r_arguments(token, decl, list);
3164 if (match_op(token, '{'))
3165 return parse_function_body(token, decl, list);
3166
3167 if (!(decl->ctype.modifiers & MOD_STATIC))
3168 decl->ctype.modifiers |= MOD_EXTERN;
3169 } else if (base_type == &void_ctype && !(decl->ctype.modifiers & MOD_EXTERN)) {
3170 sparse_error(token->pos, "void declaration");
3171 }
3172 if (base_type == &incomplete_ctype) {
3173 warning(decl->pos, "'%s' has implicit type", show_ident(decl->ident));
3174 decl->ctype.base_type = &int_ctype;;
3175 }
3176
3177 for (;;) {
3178 if (!is_typedef && match_op(token, '=')) {
3179 token = initializer(&decl->initializer, token->next);
3180 }
3181 if (!is_typedef) {
3182 if (validate_decl)
3183 validate_decl(decl);
3184
3185 if (decl->initializer && decl->ctype.modifiers & MOD_EXTERN) {
3186 warning(decl->pos, "symbol with external linkage has initializer");
3187 decl->ctype.modifiers &= ~MOD_EXTERN;
3188 }
3189
3190 if (!(decl->ctype.modifiers & (MOD_EXTERN | MOD_INLINE))) {
3191 add_symbol(list, decl);
3192 fn_local_symbol(decl);
3193 }
3194 }
3195 check_declaration(decl);
3196 if (decl->same_symbol) {
3197 decl->definition = decl->same_symbol->definition;
3198 decl->op = decl->same_symbol->op;
3199 if (is_typedef) {
3200 // TODO: handle -std=c89 --pedantic
3201 check_duplicates(decl);
3202 }
3203 }
3204
3205 if (ctx.autotype) {
3206 const char *msg = NULL;
3207 if (decl->ctype.base_type != &autotype_ctype)
3208 msg = "on non-identifier";
3209 else if (match_op(token, ','))
3210 msg = "on declaration list";
3211 else if (!decl->initializer)
3212 msg = "without initializer";
3213 else if (decl->initializer->type == EXPR_SYMBOL &&
3214 decl->initializer->symbol == decl)
3215 msg = "on self-init var";
3216 if (msg) {
3217 sparse_error(decl->pos, "__auto_type %s", msg);
3218 decl->ctype.base_type = &bad_ctype;
3219 }
3220 }
3221
3222 if (!match_op(token, ','))
3223 break;
3224
3225 token = token->next;
3226 ident = NULL;
3227 decl = alloc_symbol(token->pos, SYM_NODE);
3228 ctx.ctype = saved;
3229 token = handle_attributes(token, &ctx, KW_ATTRIBUTE);
3230 token = declarator(token, &ctx);
3231 token = handle_attributes(token, &ctx, KW_ATTRIBUTE | KW_ASM);
3232 apply_modifiers(token->pos, &ctx);
3233 decl->ctype = ctx.ctype;
3234 decl->ctype.modifiers |= mod;
3235 decl->endpos = token->pos;
3236 if (!ident) {
3237 sparse_error(token->pos, "expected identifier name in type definition");
3238 return token;
3239 }
3240
3241 if (is_typedef)
3242 decl->ctype.modifiers |= MOD_USERTYPE;
3243
3244 bind_symbol(decl, ident, is_typedef ? NS_TYPEDEF: NS_SYMBOL);
3245
3246 /* Function declarations are automatically extern unless specifically static */
3247 base_type = decl->ctype.base_type;
3248 if (!is_typedef && base_type && base_type->type == SYM_FN) {
3249 if (!(decl->ctype.modifiers & MOD_STATIC))
3250 decl->ctype.modifiers |= MOD_EXTERN;
3251 }
3252 }
3253 return expect(token, ';', "at end of declaration");
3254 }
Static analysis for C