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buf_size: add a NULL check
[smatch.git] / parse.c
blob51b256100f3af74ec9a3af751f3bfa8a2d13a919
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 * Licensed under the Open Software License version 1.1
11 */
12
13 #include <stdarg.h>
14 #include <stdlib.h>
15 #include <stdio.h>
16 #include <string.h>
17 #include <ctype.h>
18 #include <unistd.h>
19 #include <fcntl.h>
20 #include <limits.h>
21
22 #include "lib.h"
23 #include "allocate.h"
24 #include "token.h"
25 #include "parse.h"
26 #include "symbol.h"
27 #include "scope.h"
28 #include "expression.h"
29 #include "target.h"
30
31 static struct symbol_list **function_symbol_list;
32 struct symbol_list *function_computed_target_list;
33 struct statement_list *function_computed_goto_list;
34
35 static struct token *statement(struct token *token, struct statement **tree);
36 static struct token *handle_attributes(struct token *token, struct decl_state *ctx, unsigned int keywords);
37
38 typedef struct token *declarator_t(struct token *, struct decl_state *);
39 static declarator_t
40 struct_specifier, union_specifier, enum_specifier,
41 attribute_specifier, typeof_specifier, parse_asm_declarator,
42 typedef_specifier, inline_specifier, auto_specifier,
43 register_specifier, static_specifier, extern_specifier,
44 thread_specifier, const_qualifier, volatile_qualifier;
45
46 static struct token *parse_if_statement(struct token *token, struct statement *stmt);
47 static struct token *parse_return_statement(struct token *token, struct statement *stmt);
48 static struct token *parse_loop_iterator(struct token *token, struct statement *stmt);
49 static struct token *parse_default_statement(struct token *token, struct statement *stmt);
50 static struct token *parse_case_statement(struct token *token, struct statement *stmt);
51 static struct token *parse_switch_statement(struct token *token, struct statement *stmt);
52 static struct token *parse_for_statement(struct token *token, struct statement *stmt);
53 static struct token *parse_while_statement(struct token *token, struct statement *stmt);
54 static struct token *parse_do_statement(struct token *token, struct statement *stmt);
55 static struct token *parse_goto_statement(struct token *token, struct statement *stmt);
56 static struct token *parse_context_statement(struct token *token, struct statement *stmt);
57 static struct token *parse_range_statement(struct token *token, struct statement *stmt);
58 static struct token *parse_asm_statement(struct token *token, struct statement *stmt);
59 static struct token *toplevel_asm_declaration(struct token *token, struct symbol_list **list);
60
61 typedef struct token *attr_t(struct token *, struct symbol *,
62 struct decl_state *);
63
64 static attr_t
65 attribute_packed, attribute_aligned, attribute_modifier,
66 attribute_address_space, attribute_context,
67 attribute_designated_init,
68 attribute_transparent_union, ignore_attribute,
69 attribute_mode, attribute_force;
70
71 typedef struct symbol *to_mode_t(struct symbol *);
72
73 static to_mode_t
74 to_QI_mode, to_HI_mode, to_SI_mode, to_DI_mode, to_TI_mode, to_word_mode;
75
76 enum {
77 Set_T = 1,
78 Set_S = 2,
79 Set_Char = 4,
80 Set_Int = 8,
81 Set_Double = 16,
82 Set_Float = 32,
83 Set_Signed = 64,
84 Set_Unsigned = 128,
85 Set_Short = 256,
86 Set_Long = 512,
87 Set_Vlong = 1024,
88 Set_Any = Set_T | Set_Short | Set_Long | Set_Signed | Set_Unsigned
89 };
90
91 enum {
92 CInt = 0, CSInt, CUInt, CReal, CChar, CSChar, CUChar
93 };
94
95 enum {
96 SNone = 0, STypedef, SAuto, SRegister, SExtern, SStatic, SForced
97 };
98
99 static struct symbol_op typedef_op = {
100 .type = KW_MODIFIER,
101 .declarator = typedef_specifier,
102 };
103
104 static struct symbol_op inline_op = {
105 .type = KW_MODIFIER,
106 .declarator = inline_specifier,
107 };
108
109 static struct symbol_op auto_op = {
110 .type = KW_MODIFIER,
111 .declarator = auto_specifier,
112 };
113
114 static struct symbol_op register_op = {
115 .type = KW_MODIFIER,
116 .declarator = register_specifier,
117 };
118
119 static struct symbol_op static_op = {
120 .type = KW_MODIFIER,
121 .declarator = static_specifier,
122 };
123
124 static struct symbol_op extern_op = {
125 .type = KW_MODIFIER,
126 .declarator = extern_specifier,
127 };
128
129 static struct symbol_op thread_op = {
130 .type = KW_MODIFIER,
131 .declarator = thread_specifier,
132 };
133
134 static struct symbol_op const_op = {
135 .type = KW_QUALIFIER,
136 .declarator = const_qualifier,
137 };
138
139 static struct symbol_op volatile_op = {
140 .type = KW_QUALIFIER,
141 .declarator = volatile_qualifier,
142 };
143
144 static struct symbol_op restrict_op = {
145 .type = KW_QUALIFIER,
146 };
147
148 static struct symbol_op typeof_op = {
149 .type = KW_SPECIFIER,
150 .declarator = typeof_specifier,
151 .test = Set_Any,
152 .set = Set_S|Set_T,
153 };
154
155 static struct symbol_op attribute_op = {
156 .type = KW_ATTRIBUTE,
157 .declarator = attribute_specifier,
158 };
159
160 static struct symbol_op struct_op = {
161 .type = KW_SPECIFIER,
162 .declarator = struct_specifier,
163 .test = Set_Any,
164 .set = Set_S|Set_T,
165 };
166
167 static struct symbol_op union_op = {
168 .type = KW_SPECIFIER,
169 .declarator = union_specifier,
170 .test = Set_Any,
171 .set = Set_S|Set_T,
172 };
173
174 static struct symbol_op enum_op = {
175 .type = KW_SPECIFIER,
176 .declarator = enum_specifier,
177 .test = Set_Any,
178 .set = Set_S|Set_T,
179 };
180
181 static struct symbol_op spec_op = {
182 .type = KW_SPECIFIER | KW_EXACT,
183 .test = Set_Any,
184 .set = Set_S|Set_T,
185 };
186
187 static struct symbol_op char_op = {
188 .type = KW_SPECIFIER,
189 .test = Set_T|Set_Long|Set_Short,
190 .set = Set_T|Set_Char,
191 .class = CChar,
192 };
193
194 static struct symbol_op int_op = {
195 .type = KW_SPECIFIER,
196 .test = Set_T,
197 .set = Set_T|Set_Int,
198 };
199
200 static struct symbol_op double_op = {
201 .type = KW_SPECIFIER,
202 .test = Set_T|Set_Signed|Set_Unsigned|Set_Short|Set_Vlong,
203 .set = Set_T|Set_Double,
204 .class = CReal,
205 };
206
207 static struct symbol_op float_op = {
208 .type = KW_SPECIFIER | KW_SHORT,
209 .test = Set_T|Set_Signed|Set_Unsigned|Set_Short|Set_Long,
210 .set = Set_T|Set_Float,
211 .class = CReal,
212 };
213
214 static struct symbol_op short_op = {
215 .type = KW_SPECIFIER | KW_SHORT,
216 .test = Set_S|Set_Char|Set_Float|Set_Double|Set_Long|Set_Short,
217 .set = Set_Short,
218 };
219
220 static struct symbol_op signed_op = {
221 .type = KW_SPECIFIER,
222 .test = Set_S|Set_Float|Set_Double|Set_Signed|Set_Unsigned,
223 .set = Set_Signed,
224 .class = CSInt,
225 };
226
227 static struct symbol_op unsigned_op = {
228 .type = KW_SPECIFIER,
229 .test = Set_S|Set_Float|Set_Double|Set_Signed|Set_Unsigned,
230 .set = Set_Unsigned,
231 .class = CUInt,
232 };
233
234 static struct symbol_op long_op = {
235 .type = KW_SPECIFIER | KW_LONG,
236 .test = Set_S|Set_Char|Set_Float|Set_Short|Set_Vlong,
237 .set = Set_Long,
238 };
239
240 static struct symbol_op if_op = {
241 .statement = parse_if_statement,
242 };
243
244 static struct symbol_op return_op = {
245 .statement = parse_return_statement,
246 };
247
248 static struct symbol_op loop_iter_op = {
249 .statement = parse_loop_iterator,
250 };
251
252 static struct symbol_op default_op = {
253 .statement = parse_default_statement,
254 };
255
256 static struct symbol_op case_op = {
257 .statement = parse_case_statement,
258 };
259
260 static struct symbol_op switch_op = {
261 .statement = parse_switch_statement,
262 };
263
264 static struct symbol_op for_op = {
265 .statement = parse_for_statement,
266 };
267
268 static struct symbol_op while_op = {
269 .statement = parse_while_statement,
270 };
271
272 static struct symbol_op do_op = {
273 .statement = parse_do_statement,
274 };
275
276 static struct symbol_op goto_op = {
277 .statement = parse_goto_statement,
278 };
279
280 static struct symbol_op __context___op = {
281 .statement = parse_context_statement,
282 };
283
284 static struct symbol_op range_op = {
285 .statement = parse_range_statement,
286 };
287
288 static struct symbol_op asm_op = {
289 .type = KW_ASM,
290 .declarator = parse_asm_declarator,
291 .statement = parse_asm_statement,
292 .toplevel = toplevel_asm_declaration,
293 };
294
295 static struct symbol_op packed_op = {
296 .attribute = attribute_packed,
297 };
298
299 static struct symbol_op aligned_op = {
300 .attribute = attribute_aligned,
301 };
302
303 static struct symbol_op attr_mod_op = {
304 .attribute = attribute_modifier,
305 };
306
307 static struct symbol_op attr_force_op = {
308 .attribute = attribute_force,
309 };
310
311 static struct symbol_op address_space_op = {
312 .attribute = attribute_address_space,
313 };
314
315 static struct symbol_op mode_op = {
316 .attribute = attribute_mode,
317 };
318
319 static struct symbol_op context_op = {
320 .attribute = attribute_context,
321 };
322
323 static struct symbol_op designated_init_op = {
324 .attribute = attribute_designated_init,
325 };
326
327 static struct symbol_op transparent_union_op = {
328 .attribute = attribute_transparent_union,
329 };
330
331 static struct symbol_op ignore_attr_op = {
332 .attribute = ignore_attribute,
333 };
334
335 static struct symbol_op mode_QI_op = {
336 .type = KW_MODE,
337 .to_mode = to_QI_mode
338 };
339
340 static struct symbol_op mode_HI_op = {
341 .type = KW_MODE,
342 .to_mode = to_HI_mode
343 };
344
345 static struct symbol_op mode_SI_op = {
346 .type = KW_MODE,
347 .to_mode = to_SI_mode
348 };
349
350 static struct symbol_op mode_DI_op = {
351 .type = KW_MODE,
352 .to_mode = to_DI_mode
353 };
354
355 static struct symbol_op mode_TI_op = {
356 .type = KW_MODE,
357 .to_mode = to_TI_mode
358 };
359
360 static struct symbol_op mode_word_op = {
361 .type = KW_MODE,
362 .to_mode = to_word_mode
363 };
364
365 static struct init_keyword {
366 const char *name;
367 enum namespace ns;
368 unsigned long modifiers;
369 struct symbol_op *op;
370 struct symbol *type;
371 } keyword_table[] = {
372 /* Type qualifiers */
373 { "const", NS_TYPEDEF, .op = &const_op },
374 { "__const", NS_TYPEDEF, .op = &const_op },
375 { "__const__", NS_TYPEDEF, .op = &const_op },
376 { "volatile", NS_TYPEDEF, .op = &volatile_op },
377 { "__volatile", NS_TYPEDEF, .op = &volatile_op },
378 { "__volatile__", NS_TYPEDEF, .op = &volatile_op },
379
380 /* Typedef.. */
381 { "typedef", NS_TYPEDEF, .op = &typedef_op },
382
383 /* Type specifiers */
384 { "void", NS_TYPEDEF, .type = &void_ctype, .op = &spec_op},
385 { "char", NS_TYPEDEF, .op = &char_op },
386 { "short", NS_TYPEDEF, .op = &short_op },
387 { "int", NS_TYPEDEF, .op = &int_op },
388 { "long", NS_TYPEDEF, .op = &long_op },
389 { "float", NS_TYPEDEF, .op = &float_op },
390 { "double", NS_TYPEDEF, .op = &double_op },
391 { "signed", NS_TYPEDEF, .op = &signed_op },
392 { "__signed", NS_TYPEDEF, .op = &signed_op },
393 { "__signed__", NS_TYPEDEF, .op = &signed_op },
394 { "unsigned", NS_TYPEDEF, .op = &unsigned_op },
395 { "_Bool", NS_TYPEDEF, .type = &bool_ctype, .op = &spec_op },
396
397 /* Predeclared types */
398 { "__builtin_va_list", NS_TYPEDEF, .type = &ptr_ctype, .op = &spec_op },
399 { "__builtin_ms_va_list", NS_TYPEDEF, .type = &ptr_ctype, .op = &spec_op },
400 { "__int128_t", NS_TYPEDEF, .type = &lllong_ctype, .op = &spec_op },
401 { "__uint128_t",NS_TYPEDEF, .type = &ulllong_ctype, .op = &spec_op },
402
403 /* Extended types */
404 { "typeof", NS_TYPEDEF, .op = &typeof_op },
405 { "__typeof", NS_TYPEDEF, .op = &typeof_op },
406 { "__typeof__", NS_TYPEDEF, .op = &typeof_op },
407
408 { "__attribute", NS_TYPEDEF, .op = &attribute_op },
409 { "__attribute__", NS_TYPEDEF, .op = &attribute_op },
410
411 { "struct", NS_TYPEDEF, .op = &struct_op },
412 { "union", NS_TYPEDEF, .op = &union_op },
413 { "enum", NS_TYPEDEF, .op = &enum_op },
414
415 { "inline", NS_TYPEDEF, .op = &inline_op },
416 { "__inline", NS_TYPEDEF, .op = &inline_op },
417 { "__inline__", NS_TYPEDEF, .op = &inline_op },
418
419 /* Ignored for now.. */
420 { "restrict", NS_TYPEDEF, .op = &restrict_op},
421 { "__restrict", NS_TYPEDEF, .op = &restrict_op},
422 { "__restrict__", NS_TYPEDEF, .op = &restrict_op},
423
424 /* Storage class */
425 { "auto", NS_TYPEDEF, .op = &auto_op },
426 { "register", NS_TYPEDEF, .op = &register_op },
427 { "static", NS_TYPEDEF, .op = &static_op },
428 { "extern", NS_TYPEDEF, .op = &extern_op },
429 { "__thread", NS_TYPEDEF, .op = &thread_op },
430
431 /* Statement */
432 { "if", NS_KEYWORD, .op = &if_op },
433 { "return", NS_KEYWORD, .op = &return_op },
434 { "break", NS_KEYWORD, .op = &loop_iter_op },
435 { "continue", NS_KEYWORD, .op = &loop_iter_op },
436 { "default", NS_KEYWORD, .op = &default_op },
437 { "case", NS_KEYWORD, .op = &case_op },
438 { "switch", NS_KEYWORD, .op = &switch_op },
439 { "for", NS_KEYWORD, .op = &for_op },
440 { "while", NS_KEYWORD, .op = &while_op },
441 { "do", NS_KEYWORD, .op = &do_op },
442 { "goto", NS_KEYWORD, .op = &goto_op },
443 { "__context__",NS_KEYWORD, .op = &__context___op },
444 { "__range__", NS_KEYWORD, .op = &range_op },
445 { "asm", NS_KEYWORD, .op = &asm_op },
446 { "__asm", NS_KEYWORD, .op = &asm_op },
447 { "__asm__", NS_KEYWORD, .op = &asm_op },
448
449 /* Attribute */
450 { "packed", NS_KEYWORD, .op = &packed_op },
451 { "__packed__", NS_KEYWORD, .op = &packed_op },
452 { "aligned", NS_KEYWORD, .op = &aligned_op },
453 { "__aligned__",NS_KEYWORD, .op = &aligned_op },
454 { "nocast", NS_KEYWORD, MOD_NOCAST, .op = &attr_mod_op },
455 { "noderef", NS_KEYWORD, MOD_NODEREF, .op = &attr_mod_op },
456 { "safe", NS_KEYWORD, MOD_SAFE, .op = &attr_mod_op },
457 { "force", NS_KEYWORD, .op = &attr_force_op },
458 { "bitwise", NS_KEYWORD, MOD_BITWISE, .op = &attr_mod_op },
459 { "__bitwise__",NS_KEYWORD, MOD_BITWISE, .op = &attr_mod_op },
460 { "address_space",NS_KEYWORD, .op = &address_space_op },
461 { "mode", NS_KEYWORD, .op = &mode_op },
462 { "context", NS_KEYWORD, .op = &context_op },
463 { "designated_init", NS_KEYWORD, .op = &designated_init_op },
464 { "__transparent_union__", NS_KEYWORD, .op = &transparent_union_op },
465 { "noreturn", NS_KEYWORD, MOD_NORETURN, .op = &attr_mod_op },
466 { "__noreturn__", NS_KEYWORD, MOD_NORETURN, .op = &attr_mod_op },
467 { "pure", NS_KEYWORD, MOD_PURE, .op = &attr_mod_op },
468 {"__pure__", NS_KEYWORD, MOD_PURE, .op = &attr_mod_op },
469 {"const", NS_KEYWORD, MOD_PURE, .op = &attr_mod_op },
470 {"__const", NS_KEYWORD, MOD_PURE, .op = &attr_mod_op },
471 {"__const__", NS_KEYWORD, MOD_PURE, .op = &attr_mod_op },
472
473 { "__mode__", NS_KEYWORD, .op = &mode_op },
474 { "QI", NS_KEYWORD, MOD_CHAR, .op = &mode_QI_op },
475 { "__QI__", NS_KEYWORD, MOD_CHAR, .op = &mode_QI_op },
476 { "HI", NS_KEYWORD, MOD_SHORT, .op = &mode_HI_op },
477 { "__HI__", NS_KEYWORD, MOD_SHORT, .op = &mode_HI_op },
478 { "SI", NS_KEYWORD, .op = &mode_SI_op },
479 { "__SI__", NS_KEYWORD, .op = &mode_SI_op },
480 { "DI", NS_KEYWORD, MOD_LONGLONG, .op = &mode_DI_op },
481 { "__DI__", NS_KEYWORD, MOD_LONGLONG, .op = &mode_DI_op },
482 { "TI", NS_KEYWORD, MOD_LONGLONGLONG, .op = &mode_TI_op },
483 { "__TI__", NS_KEYWORD, MOD_LONGLONGLONG, .op = &mode_TI_op },
484 { "word", NS_KEYWORD, MOD_LONG, .op = &mode_word_op },
485 { "__word__", NS_KEYWORD, MOD_LONG, .op = &mode_word_op },
486 };
487
488 const char *ignored_attributes[] = {
489 "alias",
490 "__alias__",
491 "alloc_size",
492 "__alloc_size__",
493 "always_inline",
494 "__always_inline__",
495 "artificial",
496 "__artificial__",
497 "bounded",
498 "__bounded__",
499 "cdecl",
500 "__cdecl__",
501 "cold",
502 "__cold__",
503 "constructor",
504 "__constructor__",
505 "deprecated",
506 "__deprecated__",
507 "destructor",
508 "__destructor__",
509 "dllexport",
510 "__dllexport__",
511 "dllimport",
512 "__dllimport__",
513 "error",
514 "__error__",
515 "externally_visible",
516 "__externally_visible__",
517 "fastcall",
518 "__fastcall__",
519 "format",
520 "__format__",
521 "format_arg",
522 "__format_arg__",
523 "hot",
524 "__hot__",
525 "leaf",
526 "__leaf__",
527 "l1_text",
528 "__l1_text__",
529 "l1_data",
530 "__l1_data__",
531 "l2",
532 "__l2__",
533 "may_alias",
534 "__may_alias__",
535 "malloc",
536 "__malloc__",
537 "may_alias",
538 "__may_alias__",
539 "model",
540 "__model__",
541 "ms_abi",
542 "__ms_abi__",
543 "ms_hook_prologue",
544 "__ms_hook_prologue__",
545 "naked",
546 "__naked__",
547 "no_instrument_function",
548 "__no_instrument_function__",
549 "noclone",
550 "__noclone",
551 "__noclone__",
552 "noinline",
553 "__noinline__",
554 "nonnull",
555 "__nonnull",
556 "__nonnull__",
557 "nothrow",
558 "__nothrow",
559 "__nothrow__",
560 "regparm",
561 "__regparm__",
562 "section",
563 "__section__",
564 "sentinel",
565 "__sentinel__",
566 "signal",
567 "__signal__",
568 "stdcall",
569 "__stdcall__",
570 "syscall_linkage",
571 "__syscall_linkage__",
572 "sysv_abi",
573 "__sysv_abi__",
574 "unused",
575 "__unused__",
576 "used",
577 "__used__",
578 "vector_size",
579 "__vector_size__",
580 "visibility",
581 "__visibility__",
582 "warn_unused_result",
583 "__warn_unused_result__",
584 "warning",
585 "__warning__",
586 "weak",
587 "__weak__",
588 };
589
590
591 void init_parser(int stream)
592 {
593 int i;
594 for (i = 0; i < ARRAY_SIZE(keyword_table); i++) {
595 struct init_keyword *ptr = keyword_table + i;
596 struct symbol *sym = create_symbol(stream, ptr->name, SYM_KEYWORD, ptr->ns);
597 sym->ident->keyword = 1;
598 if (ptr->ns == NS_TYPEDEF)
599 sym->ident->reserved = 1;
600 sym->ctype.modifiers = ptr->modifiers;
601 sym->ctype.base_type = ptr->type;
602 sym->op = ptr->op;
603 }
604
605 for (i = 0; i < ARRAY_SIZE(ignored_attributes); i++) {
606 const char * name = ignored_attributes[i];
607 struct symbol *sym = create_symbol(stream, name, SYM_KEYWORD,
608 NS_KEYWORD);
609 sym->ident->keyword = 1;
610 sym->op = &ignore_attr_op;
611 }
612 }
613
614
615 // Add a symbol to the list of function-local symbols
616 static void fn_local_symbol(struct symbol *sym)
617 {
618 if (function_symbol_list)
619 add_symbol(function_symbol_list, sym);
620 }
621
622 static int SENTINEL_ATTR match_idents(struct token *token, ...)
623 {
624 va_list args;
625 struct ident * next;
626
627 if (token_type(token) != TOKEN_IDENT)
628 return 0;
629
630 va_start(args, token);
631 do {
632 next = va_arg(args, struct ident *);
633 } while (next && token->ident != next);
634 va_end(args);
635
636 return next && token->ident == next;
637 }
638
639
640 struct statement *alloc_statement(struct position pos, int type)
641 {
642 struct statement *stmt = __alloc_statement(0);
643 stmt->type = type;
644 stmt->pos = pos;
645 return stmt;
646 }
647
648 static struct token *struct_declaration_list(struct token *token, struct symbol_list **list);
649
650 static void apply_modifiers(struct position pos, struct decl_state *ctx)
651 {
652 struct symbol *ctype;
653 if (!ctx->mode)
654 return;
655 ctype = ctx->mode->to_mode(ctx->ctype.base_type);
656 if (!ctype)
657 sparse_error(pos, "don't know how to apply mode to %s",
658 show_typename(ctx->ctype.base_type));
659 else
660 ctx->ctype.base_type = ctype;
661
662 }
663
664 static struct symbol * alloc_indirect_symbol(struct position pos, struct ctype *ctype, int type)
665 {
666 struct symbol *sym = alloc_symbol(pos, type);
667
668 sym->ctype.base_type = ctype->base_type;
669 sym->ctype.modifiers = ctype->modifiers;
670
671 ctype->base_type = sym;
672 ctype->modifiers = 0;
673 return sym;
674 }
675
676 /*
677 * NOTE! NS_LABEL is not just a different namespace,
678 * it also ends up using function scope instead of the
679 * regular symbol scope.
680 */
681 struct symbol *label_symbol(struct token *token)
682 {
683 struct symbol *sym = lookup_symbol(token->ident, NS_LABEL);
684 if (!sym) {
685 sym = alloc_symbol(token->pos, SYM_LABEL);
686 bind_symbol(sym, token->ident, NS_LABEL);
687 fn_local_symbol(sym);
688 }
689 return sym;
690 }
691
692 static struct token *struct_union_enum_specifier(enum type type,
693 struct token *token, struct decl_state *ctx,
694 struct token *(*parse)(struct token *, struct symbol *))
695 {
696 struct symbol *sym;
697 struct position *repos;
698
699 token = handle_attributes(token, ctx, KW_ATTRIBUTE);
700 if (token_type(token) == TOKEN_IDENT) {
701 sym = lookup_symbol(token->ident, NS_STRUCT);
702 if (!sym ||
703 (is_outer_scope(sym->scope) &&
704 (match_op(token->next,';') || match_op(token->next,'{')))) {
705 // Either a new symbol, or else an out-of-scope
706 // symbol being redefined.
707 sym = alloc_symbol(token->pos, type);
708 bind_symbol(sym, token->ident, NS_STRUCT);
709 }
710 if (sym->type != type)
711 error_die(token->pos, "invalid tag applied to %s", show_typename (sym));
712 ctx->ctype.base_type = sym;
713 repos = &token->pos;
714 token = token->next;
715 if (match_op(token, '{')) {
716 // The following test is actually wrong for empty
717 // structs, but (1) they are not C99, (2) gcc does
718 // the same thing, and (3) it's easier.
719 if (sym->symbol_list)
720 error_die(token->pos, "redefinition of %s", show_typename (sym));
721 sym->pos = *repos;
722 token = parse(token->next, sym);
723 token = expect(token, '}', "at end of struct-union-enum-specifier");
724
725 // Mark the structure as needing re-examination
726 sym->examined = 0;
727 sym->endpos = token->pos;
728 }
729 return token;
730 }
731
732 // private struct/union/enum type
733 if (!match_op(token, '{')) {
734 sparse_error(token->pos, "expected declaration");
735 ctx->ctype.base_type = &bad_ctype;
736 return token;
737 }
738
739 sym = alloc_symbol(token->pos, type);
740 token = parse(token->next, sym);
741 ctx->ctype.base_type = sym;
742 token = expect(token, '}', "at end of specifier");
743 sym->endpos = token->pos;
744
745 return token;
746 }
747
748 static struct token *parse_struct_declaration(struct token *token, struct symbol *sym)
749 {
750 struct symbol *field, *last = NULL;
751 struct token *res;
752 res = struct_declaration_list(token, &sym->symbol_list);
753 FOR_EACH_PTR(sym->symbol_list, field) {
754 if (!field->ident) {
755 struct symbol *base = field->ctype.base_type;
756 if (base && base->type == SYM_BITFIELD)
757 continue;
758 }
759 if (last)
760 last->next_subobject = field;
761 last = field;
762 } END_FOR_EACH_PTR(field);
763 return res;
764 }
765
766 static struct token *parse_union_declaration(struct token *token, struct symbol *sym)
767 {
768 return struct_declaration_list(token, &sym->symbol_list);
769 }
770
771 static struct token *struct_specifier(struct token *token, struct decl_state *ctx)
772 {
773 return struct_union_enum_specifier(SYM_STRUCT, token, ctx, parse_struct_declaration);
774 }
775
776 static struct token *union_specifier(struct token *token, struct decl_state *ctx)
777 {
778 return struct_union_enum_specifier(SYM_UNION, token, ctx, parse_union_declaration);
779 }
780
781
782 typedef struct {
783 int x;
784 unsigned long long y;
785 } Num;
786
787 static void upper_boundary(Num *n, Num *v)
788 {
789 if (n->x > v->x)
790 return;
791 if (n->x < v->x) {
792 *n = *v;
793 return;
794 }
795 if (n->y < v->y)
796 n->y = v->y;
797 }
798
799 static void lower_boundary(Num *n, Num *v)
800 {
801 if (n->x < v->x)
802 return;
803 if (n->x > v->x) {
804 *n = *v;
805 return;
806 }
807 if (n->y > v->y)
808 n->y = v->y;
809 }
810
811 static int type_is_ok(struct symbol *type, Num *upper, Num *lower)
812 {
813 int shift = type->bit_size;
814 int is_unsigned = type->ctype.modifiers & MOD_UNSIGNED;
815
816 if (!is_unsigned)
817 shift--;
818 if (upper->x == 0 && upper->y >> shift)
819 return 0;
820 if (lower->x == 0 || (!is_unsigned && (~lower->y >> shift) == 0))
821 return 1;
822 return 0;
823 }
824
825 static struct symbol *bigger_enum_type(struct symbol *s1, struct symbol *s2)
826 {
827 if (s1->bit_size < s2->bit_size) {
828 s1 = s2;
829 } else if (s1->bit_size == s2->bit_size) {
830 if (s2->ctype.modifiers & MOD_UNSIGNED)
831 s1 = s2;
832 }
833 if (s1->bit_size < bits_in_int)
834 return &int_ctype;
835 return s1;
836 }
837
838 static void cast_enum_list(struct symbol_list *list, struct symbol *base_type)
839 {
840 struct symbol *sym;
841
842 FOR_EACH_PTR(list, sym) {
843 struct expression *expr = sym->initializer;
844 struct symbol *ctype;
845 if (expr->type != EXPR_VALUE)
846 continue;
847 ctype = expr->ctype;
848 if (ctype->bit_size == base_type->bit_size)
849 continue;
850 cast_value(expr, base_type, expr, ctype);
851 } END_FOR_EACH_PTR(sym);
852 }
853
854 static struct token *parse_enum_declaration(struct token *token, struct symbol *parent)
855 {
856 unsigned long long lastval = 0;
857 struct symbol *ctype = NULL, *base_type = NULL;
858 Num upper = {-1, 0}, lower = {1, 0};
859
860 parent->examined = 1;
861 parent->ctype.base_type = &int_ctype;
862 while (token_type(token) == TOKEN_IDENT) {
863 struct expression *expr = NULL;
864 struct token *next = token->next;
865 struct symbol *sym;
866
867 if (match_op(next, '=')) {
868 next = constant_expression(next->next, &expr);
869 lastval = get_expression_value(expr);
870 ctype = &void_ctype;
871 if (expr && expr->ctype)
872 ctype = expr->ctype;
873 } else if (!ctype) {
874 ctype = &int_ctype;
875 } else if (is_int_type(ctype)) {
876 lastval++;
877 } else {
878 error_die(token->pos, "can't increment the last enum member");
879 }
880
881 if (!expr) {
882 expr = alloc_expression(token->pos, EXPR_VALUE);
883 expr->value = lastval;
884 expr->ctype = ctype;
885 }
886
887 sym = alloc_symbol(token->pos, SYM_NODE);
888 bind_symbol(sym, token->ident, NS_SYMBOL);
889 sym->ctype.modifiers &= ~MOD_ADDRESSABLE;
890 sym->initializer = expr;
891 sym->enum_member = 1;
892 sym->ctype.base_type = parent;
893 add_ptr_list(&parent->symbol_list, sym);
894
895 if (base_type != &bad_ctype) {
896 if (ctype->type == SYM_NODE)
897 ctype = ctype->ctype.base_type;
898 if (ctype->type == SYM_ENUM) {
899 if (ctype == parent)
900 ctype = base_type;
901 else
902 ctype = ctype->ctype.base_type;
903 }
904 /*
905 * base_type rules:
906 * - if all enums are of the same type, then
907 * the base_type is that type (two first
908 * cases)
909 * - if enums are of different types, they
910 * all have to be integer types, and the
911 * base type is at least "int_ctype".
912 * - otherwise the base_type is "bad_ctype".
913 */
914 if (!base_type) {
915 base_type = ctype;
916 } else if (ctype == base_type) {
917 /* nothing */
918 } else if (is_int_type(base_type) && is_int_type(ctype)) {
919 base_type = bigger_enum_type(base_type, ctype);
920 } else
921 base_type = &bad_ctype;
922 parent->ctype.base_type = base_type;
923 }
924 if (is_int_type(base_type)) {
925 Num v = {.y = lastval};
926 if (ctype->ctype.modifiers & MOD_UNSIGNED)
927 v.x = 0;
928 else if ((long long)lastval >= 0)
929 v.x = 0;
930 else
931 v.x = -1;
932 upper_boundary(&upper, &v);
933 lower_boundary(&lower, &v);
934 }
935 token = next;
936
937 sym->endpos = token->pos;
938
939 if (!match_op(token, ','))
940 break;
941 token = token->next;
942 }
943 if (!base_type) {
944 sparse_error(token->pos, "bad enum definition");
945 base_type = &bad_ctype;
946 }
947 else if (!is_int_type(base_type))
948 base_type = base_type;
949 else if (type_is_ok(base_type, &upper, &lower))
950 base_type = base_type;
951 else if (type_is_ok(&int_ctype, &upper, &lower))
952 base_type = &int_ctype;
953 else if (type_is_ok(&uint_ctype, &upper, &lower))
954 base_type = &uint_ctype;
955 else if (type_is_ok(&long_ctype, &upper, &lower))
956 base_type = &long_ctype;
957 else if (type_is_ok(&ulong_ctype, &upper, &lower))
958 base_type = &ulong_ctype;
959 else if (type_is_ok(&llong_ctype, &upper, &lower))
960 base_type = &llong_ctype;
961 else if (type_is_ok(&ullong_ctype, &upper, &lower))
962 base_type = &ullong_ctype;
963 else
964 base_type = &bad_ctype;
965 parent->ctype.base_type = base_type;
966 parent->ctype.modifiers |= (base_type->ctype.modifiers & MOD_UNSIGNED);
967 parent->examined = 0;
968
969 cast_enum_list(parent->symbol_list, base_type);
970
971 return token;
972 }
973
974 static struct token *enum_specifier(struct token *token, struct decl_state *ctx)
975 {
976 struct token *ret = struct_union_enum_specifier(SYM_ENUM, token, ctx, parse_enum_declaration);
977 struct ctype *ctype = &ctx->ctype.base_type->ctype;
978
979 if (!ctype->base_type)
980 ctype->base_type = &incomplete_ctype;
981
982 return ret;
983 }
984
985 static void apply_ctype(struct position pos, struct ctype *thistype, struct ctype *ctype);
986
987 static struct token *typeof_specifier(struct token *token, struct decl_state *ctx)
988 {
989 struct symbol *sym;
990
991 if (!match_op(token, '(')) {
992 sparse_error(token->pos, "expected '(' after typeof");
993 return token;
994 }
995 if (lookup_type(token->next)) {
996 token = typename(token->next, &sym, NULL);
997 ctx->ctype.base_type = sym->ctype.base_type;
998 apply_ctype(token->pos, &sym->ctype, &ctx->ctype);
999 } else {
1000 struct symbol *typeof_sym = alloc_symbol(token->pos, SYM_TYPEOF);
1001 token = parse_expression(token->next, &typeof_sym->initializer);
1002
1003 typeof_sym->endpos = token->pos;
1004 if (!typeof_sym->initializer) {
1005 sparse_error(token->pos, "expected expression after the '(' token");
1006 typeof_sym = &bad_ctype;
1007 }
1008 ctx->ctype.base_type = typeof_sym;
1009 }
1010 return expect(token, ')', "after typeof");
1011 }
1012
1013 static struct token *ignore_attribute(struct token *token, struct symbol *attr, struct decl_state *ctx)
1014 {
1015 struct expression *expr = NULL;
1016 if (match_op(token, '('))
1017 token = parens_expression(token, &expr, "in attribute");
1018 return token;
1019 }
1020
1021 static struct token *attribute_packed(struct token *token, struct symbol *attr, struct decl_state *ctx)
1022 {
1023 set_attr_is_packed(&ctx->ctype);
1024 if (!ctx->ctype.alignment)
1025 ctx->ctype.alignment = 1;
1026 return token;
1027 }
1028
1029 static struct token *attribute_aligned(struct token *token, struct symbol *attr, struct decl_state *ctx)
1030 {
1031 int alignment = max_alignment;
1032 struct expression *expr = NULL;
1033
1034 if (match_op(token, '(')) {
1035 token = parens_expression(token, &expr, "in attribute");
1036 if (expr)
1037 alignment = const_expression_value(expr);
1038 }
1039 if (alignment & (alignment-1)) {
1040 warning(token->pos, "I don't like non-power-of-2 alignments");
1041 return token;
1042 } else if (alignment > ctx->ctype.alignment)
1043 ctx->ctype.alignment = alignment;
1044 return token;
1045 }
1046
1047 static void apply_qualifier(struct position *pos, struct ctype *ctx, unsigned long qual)
1048 {
1049 if (ctx->modifiers & qual)
1050 warning(*pos, "duplicate %s", modifier_string(qual));
1051 ctx->modifiers |= qual;
1052 }
1053
1054 static struct token *attribute_modifier(struct token *token, struct symbol *attr, struct decl_state *ctx)
1055 {
1056 apply_qualifier(&token->pos, &ctx->ctype, attr->ctype.modifiers);
1057 return token;
1058 }
1059
1060 static struct token *attribute_address_space(struct token *token, struct symbol *attr, struct decl_state *ctx)
1061 {
1062 struct expression *expr = NULL;
1063 int as;
1064 token = expect(token, '(', "after address_space attribute");
1065 token = conditional_expression(token, &expr);
1066 if (expr) {
1067 as = const_expression_value(expr);
1068 if (Waddress_space && as)
1069 attr_set_as(&ctx->ctype, as);
1070 }
1071 token = expect(token, ')', "after address_space attribute");
1072 return token;
1073 }
1074
1075 static struct symbol *to_QI_mode(struct symbol *ctype)
1076 {
1077 if (ctype->ctype.base_type != &int_type)
1078 return NULL;
1079 if (ctype == &char_ctype)
1080 return ctype;
1081 return ctype->ctype.modifiers & MOD_UNSIGNED ? &uchar_ctype
1082 : &schar_ctype;
1083 }
1084
1085 static struct symbol *to_HI_mode(struct symbol *ctype)
1086 {
1087 if (ctype->ctype.base_type != &int_type)
1088 return NULL;
1089 return ctype->ctype.modifiers & MOD_UNSIGNED ? &ushort_ctype
1090 : &sshort_ctype;
1091 }
1092
1093 static struct symbol *to_SI_mode(struct symbol *ctype)
1094 {
1095 if (ctype->ctype.base_type != &int_type)
1096 return NULL;
1097 return ctype->ctype.modifiers & MOD_UNSIGNED ? &uint_ctype
1098 : &sint_ctype;
1099 }
1100
1101 static struct symbol *to_DI_mode(struct symbol *ctype)
1102 {
1103 if (ctype->ctype.base_type != &int_type)
1104 return NULL;
1105 return ctype->ctype.modifiers & MOD_UNSIGNED ? &ullong_ctype
1106 : &sllong_ctype;
1107 }
1108
1109 static struct symbol *to_TI_mode(struct symbol *ctype)
1110 {
1111 if (ctype->ctype.base_type != &int_type)
1112 return NULL;
1113 return ctype->ctype.modifiers & MOD_UNSIGNED ? &ulllong_ctype
1114 : &slllong_ctype;
1115 }
1116
1117 static struct symbol *to_word_mode(struct symbol *ctype)
1118 {
1119 if (ctype->ctype.base_type != &int_type)
1120 return NULL;
1121 return ctype->ctype.modifiers & MOD_UNSIGNED ? &ulong_ctype
1122 : &slong_ctype;
1123 }
1124
1125 static struct token *attribute_mode(struct token *token, struct symbol *attr, struct decl_state *ctx)
1126 {
1127 token = expect(token, '(', "after mode attribute");
1128 if (token_type(token) == TOKEN_IDENT) {
1129 struct symbol *mode = lookup_keyword(token->ident, NS_KEYWORD);
1130 if (mode && mode->op->type == KW_MODE)
1131 ctx->mode = mode->op;
1132 else
1133 sparse_error(token->pos, "unknown mode attribute %s\n", show_ident(token->ident));
1134 token = token->next;
1135 } else
1136 sparse_error(token->pos, "expect attribute mode symbol\n");
1137 token = expect(token, ')', "after mode attribute");
1138 return token;
1139 }
1140
1141 static struct token *attribute_context(struct token *token, struct symbol *attr, struct decl_state *ctx)
1142 {
1143 struct context *context = alloc_context();
1144 struct expression *args[3];
1145 int argc = 0;
1146
1147 token = expect(token, '(', "after context attribute");
1148 while (!match_op(token, ')')) {
1149 struct expression *expr = NULL;
1150 token = conditional_expression(token, &expr);
1151 if (!expr)
1152 break;
1153 if (argc < 3)
1154 args[argc++] = expr;
1155 if (!match_op(token, ','))
1156 break;
1157 token = token->next;
1158 }
1159
1160 switch(argc) {
1161 case 0:
1162 sparse_error(token->pos, "expected context input/output values");
1163 break;
1164 case 1:
1165 context->in = get_expression_value(args[0]);
1166 break;
1167 case 2:
1168 context->in = get_expression_value(args[0]);
1169 context->out = get_expression_value(args[1]);
1170 break;
1171 case 3:
1172 context->context = args[0];
1173 context->in = get_expression_value(args[1]);
1174 context->out = get_expression_value(args[2]);
1175 break;
1176 }
1177
1178 if (argc)
1179 attr_add_context(&ctx->ctype, context);
1180
1181 token = expect(token, ')', "after context attribute");
1182 return token;
1183 }
1184
1185 static struct token *attribute_designated_init(struct token *token, struct symbol *attr, struct decl_state *ctx)
1186 {
1187 if (ctx->ctype.base_type && ctx->ctype.base_type->type == SYM_STRUCT)
1188 ctx->ctype.base_type->designated_init = 1;
1189 else
1190 warning(token->pos, "attribute designated_init applied to non-structure type");
1191 return token;
1192 }
1193
1194 static struct token *attribute_transparent_union(struct token *token, struct symbol *attr, struct decl_state *ctx)
1195 {
1196 if (Wtransparent_union)
1197 warning(token->pos, "ignoring attribute __transparent_union__");
1198 return token;
1199 }
1200
1201 static struct token *recover_unknown_attribute(struct token *token)
1202 {
1203 struct expression *expr = NULL;
1204
1205 sparse_error(token->pos, "attribute '%s': unknown attribute", show_ident(token->ident));
1206 token = token->next;
1207 if (match_op(token, '('))
1208 token = parens_expression(token, &expr, "in attribute");
1209 return token;
1210 }
1211
1212 static struct token *attribute_specifier(struct token *token, struct decl_state *ctx)
1213 {
1214 token = expect(token, '(', "after attribute");
1215 token = expect(token, '(', "after attribute");
1216
1217 for (;;) {
1218 struct ident *attribute_name;
1219 struct symbol *attr;
1220
1221 if (eof_token(token))
1222 break;
1223 if (match_op(token, ';'))
1224 break;
1225 if (token_type(token) != TOKEN_IDENT)
1226 break;
1227 attribute_name = token->ident;
1228 attr = lookup_keyword(attribute_name, NS_KEYWORD);
1229 if (attr && attr->op->attribute)
1230 token = attr->op->attribute(token->next, attr, ctx);
1231 else
1232 token = recover_unknown_attribute(token);
1233
1234 if (!match_op(token, ','))
1235 break;
1236 token = token->next;
1237 }
1238
1239 token = expect(token, ')', "after attribute");
1240 token = expect(token, ')', "after attribute");
1241
1242 if (ctx->ctype.attribute->is_packed && ctx->ctype.base_type)
1243 set_attr_is_packed(&ctx->ctype.base_type->ctype);
1244
1245 return token;
1246 }
1247
1248 static const char *storage_class[] =
1249 {
1250 [STypedef] = "typedef",
1251 [SAuto] = "auto",
1252 [SExtern] = "extern",
1253 [SStatic] = "static",
1254 [SRegister] = "register",
1255 [SForced] = "[force]"
1256 };
1257
1258 static unsigned long storage_modifiers(struct decl_state *ctx)
1259 {
1260 static unsigned long mod[] =
1261 {
1262 [SAuto] = MOD_AUTO,
1263 [SExtern] = MOD_EXTERN,
1264 [SStatic] = MOD_STATIC,
1265 [SRegister] = MOD_REGISTER
1266 };
1267 return mod[ctx->storage_class] | (ctx->is_inline ? MOD_INLINE : 0)
1268 | (ctx->is_tls ? MOD_TLS : 0);
1269 }
1270
1271 static void set_storage_class(struct position *pos, struct decl_state *ctx, int class)
1272 {
1273 /* __thread can be used alone, or with extern or static */
1274 if (ctx->is_tls && (class != SStatic && class != SExtern)) {
1275 sparse_error(*pos, "__thread can only be used alone, or with "
1276 "extern or static");
1277 return;
1278 }
1279
1280 if (!ctx->storage_class) {
1281 ctx->storage_class = class;
1282 return;
1283 }
1284 if (ctx->storage_class == class)
1285 sparse_error(*pos, "duplicate %s", storage_class[class]);
1286 else
1287 sparse_error(*pos, "multiple storage classes");
1288 }
1289
1290 static struct token *typedef_specifier(struct token *next, struct decl_state *ctx)
1291 {
1292 set_storage_class(&next->pos, ctx, STypedef);
1293 return next;
1294 }
1295
1296 static struct token *auto_specifier(struct token *next, struct decl_state *ctx)
1297 {
1298 set_storage_class(&next->pos, ctx, SAuto);
1299 return next;
1300 }
1301
1302 static struct token *register_specifier(struct token *next, struct decl_state *ctx)
1303 {
1304 set_storage_class(&next->pos, ctx, SRegister);
1305 return next;
1306 }
1307
1308 static struct token *static_specifier(struct token *next, struct decl_state *ctx)
1309 {
1310 set_storage_class(&next->pos, ctx, SStatic);
1311 return next;
1312 }
1313
1314 static struct token *extern_specifier(struct token *next, struct decl_state *ctx)
1315 {
1316 set_storage_class(&next->pos, ctx, SExtern);
1317 return next;
1318 }
1319
1320 static struct token *thread_specifier(struct token *next, struct decl_state *ctx)
1321 {
1322 /* This GCC extension can be used alone, or with extern or static */
1323 if (!ctx->storage_class || ctx->storage_class == SStatic
1324 || ctx->storage_class == SExtern) {
1325 ctx->is_tls = 1;
1326 } else {
1327 sparse_error(next->pos, "__thread can only be used alone, or "
1328 "with extern or static");
1329 }
1330
1331 return next;
1332 }
1333
1334 static struct token *attribute_force(struct token *token, struct symbol *attr, struct decl_state *ctx)
1335 {
1336 set_storage_class(&token->pos, ctx, SForced);
1337 return token;
1338 }
1339
1340 static struct token *inline_specifier(struct token *next, struct decl_state *ctx)
1341 {
1342 ctx->is_inline = 1;
1343 return next;
1344 }
1345
1346 static struct token *const_qualifier(struct token *next, struct decl_state *ctx)
1347 {
1348 apply_qualifier(&next->pos, &ctx->ctype, MOD_CONST);
1349 return next;
1350 }
1351
1352 static struct token *volatile_qualifier(struct token *next, struct decl_state *ctx)
1353 {
1354 apply_qualifier(&next->pos, &ctx->ctype, MOD_VOLATILE);
1355 return next;
1356 }
1357
1358 static void apply_ctype(struct position pos, struct ctype *thistype, struct ctype *ctype)
1359 {
1360 unsigned long mod = thistype->modifiers;
1361
1362 if (mod)
1363 apply_qualifier(&pos, ctype, mod);
1364
1365 /* Alignment */
1366 if (thistype->alignment > ctype->alignment)
1367 ctype->alignment = thistype->alignment;
1368
1369 /* Attribute */
1370 merge_attr(ctype, thistype);
1371 }
1372
1373 static void specifier_conflict(struct position pos, int what, struct ident *new)
1374 {
1375 const char *old;
1376 if (what & (Set_S | Set_T))
1377 goto Catch_all;
1378 if (what & Set_Char)
1379 old = "char";
1380 else if (what & Set_Double)
1381 old = "double";
1382 else if (what & Set_Float)
1383 old = "float";
1384 else if (what & Set_Signed)
1385 old = "signed";
1386 else if (what & Set_Unsigned)
1387 old = "unsigned";
1388 else if (what & Set_Short)
1389 old = "short";
1390 else if (what & Set_Long)
1391 old = "long";
1392 else
1393 old = "long long";
1394 sparse_error(pos, "impossible combination of type specifiers: %s %s",
1395 old, show_ident(new));
1396 return;
1397
1398 Catch_all:
1399 sparse_error(pos, "two or more data types in declaration specifiers");
1400 }
1401
1402 static struct symbol * const int_types[] =
1403 {&short_ctype, &int_ctype, &long_ctype, &llong_ctype};
1404 static struct symbol * const signed_types[] =
1405 {&sshort_ctype, &sint_ctype, &slong_ctype, &sllong_ctype,
1406 &slllong_ctype};
1407 static struct symbol * const unsigned_types[] =
1408 {&ushort_ctype, &uint_ctype, &ulong_ctype, &ullong_ctype,
1409 &ulllong_ctype};
1410 static struct symbol * const real_types[] =
1411 {&float_ctype, &double_ctype, &ldouble_ctype};
1412 static struct symbol * const char_types[] =
1413 {&char_ctype, &schar_ctype, &uchar_ctype};
1414 static struct symbol * const * const types[] = {
1415 int_types + 1, signed_types + 1, unsigned_types + 1,
1416 real_types + 1, char_types, char_types + 1, char_types + 2
1417 };
1418
1419 struct symbol *ctype_integer(int size, int want_unsigned)
1420 {
1421 return types[want_unsigned ? CUInt : CInt][size];
1422 }
1423
1424 static struct token *handle_qualifiers(struct token *t, struct decl_state *ctx)
1425 {
1426 while (token_type(t) == TOKEN_IDENT) {
1427 struct symbol *s = lookup_symbol(t->ident, NS_TYPEDEF);
1428 if (!s)
1429 break;
1430 if (s->type != SYM_KEYWORD)
1431 break;
1432 if (!(s->op->type & (KW_ATTRIBUTE | KW_QUALIFIER)))
1433 break;
1434 t = t->next;
1435 if (s->op->declarator)
1436 t = s->op->declarator(t, ctx);
1437 }
1438 return t;
1439 }
1440
1441 static struct token *declaration_specifiers(struct token *token, struct decl_state *ctx)
1442 {
1443 int seen = 0;
1444 int class = CInt;
1445 int size = 0;
1446
1447 while (token_type(token) == TOKEN_IDENT) {
1448 struct symbol *s = lookup_symbol(token->ident,
1449 NS_TYPEDEF | NS_SYMBOL);
1450 if (!s || !(s->namespace & NS_TYPEDEF))
1451 break;
1452 if (s->type != SYM_KEYWORD) {
1453 if (seen & Set_Any)
1454 break;
1455 seen |= Set_S | Set_T;
1456 ctx->ctype.base_type = s->ctype.base_type;
1457 apply_ctype(token->pos, &s->ctype, &ctx->ctype);
1458 token = token->next;
1459 continue;
1460 }
1461 if (s->op->type & KW_SPECIFIER) {
1462 if (seen & s->op->test) {
1463 specifier_conflict(token->pos,
1464 seen & s->op->test,
1465 token->ident);
1466 break;
1467 }
1468 seen |= s->op->set;
1469 class += s->op->class;
1470 if (s->op->type & KW_SHORT) {
1471 size = -1;
1472 } else if (s->op->type & KW_LONG && size++) {
1473 if (class == CReal) {
1474 specifier_conflict(token->pos,
1475 Set_Vlong,
1476 &double_ident);
1477 break;
1478 }
1479 seen |= Set_Vlong;
1480 }
1481 }
1482 token = token->next;
1483 if (s->op->declarator)
1484 token = s->op->declarator(token, ctx);
1485 if (s->op->type & KW_EXACT) {
1486 ctx->ctype.base_type = s->ctype.base_type;
1487 ctx->ctype.modifiers |= s->ctype.modifiers;
1488 }
1489 }
1490
1491 if (!(seen & Set_S)) { /* not set explicitly? */
1492 struct symbol *base = &incomplete_ctype;
1493 if (seen & Set_Any)
1494 base = types[class][size];
1495 ctx->ctype.base_type = base;
1496 }
1497
1498 if (ctx->ctype.modifiers & MOD_BITWISE) {
1499 struct symbol *type;
1500 ctx->ctype.modifiers &= ~MOD_BITWISE;
1501 if (!is_int_type(ctx->ctype.base_type)) {
1502 sparse_error(token->pos, "invalid modifier");
1503 return token;
1504 }
1505 type = alloc_symbol(token->pos, SYM_BASETYPE);
1506 *type = *ctx->ctype.base_type;
1507 type->ctype.modifiers &= ~MOD_SPECIFIER;
1508 type->ctype.base_type = ctx->ctype.base_type;
1509 type->type = SYM_RESTRICT;
1510 ctx->ctype.base_type = type;
1511 create_fouled(type);
1512 }
1513 return token;
1514 }
1515
1516 static struct token *abstract_array_declarator(struct token *token, struct symbol *sym)
1517 {
1518 struct expression *expr = NULL;
1519
1520 if (match_idents(token, &restrict_ident, &__restrict_ident, NULL))
1521 token = token->next;
1522 token = parse_expression(token, &expr);
1523 sym->array_size = expr;
1524 return token;
1525 }
1526
1527 static struct token *parameter_type_list(struct token *, struct symbol *);
1528 static struct token *identifier_list(struct token *, struct symbol *);
1529 static struct token *declarator(struct token *token, struct decl_state *ctx);
1530
1531 static struct token *skip_attribute(struct token *token)
1532 {
1533 token = token->next;
1534 if (match_op(token, '(')) {
1535 int depth = 1;
1536 token = token->next;
1537 while (depth && !eof_token(token)) {
1538 if (token_type(token) == TOKEN_SPECIAL) {
1539 if (token->special == '(')
1540 depth++;
1541 else if (token->special == ')')
1542 depth--;
1543 }
1544 token = token->next;
1545 }
1546 }
1547 return token;
1548 }
1549
1550 static struct token *skip_attributes(struct token *token)
1551 {
1552 struct symbol *keyword;
1553 for (;;) {
1554 if (token_type(token) != TOKEN_IDENT)
1555 break;
1556 keyword = lookup_keyword(token->ident, NS_KEYWORD | NS_TYPEDEF);
1557 if (!keyword || keyword->type != SYM_KEYWORD)
1558 break;
1559 if (!(keyword->op->type & KW_ATTRIBUTE))
1560 break;
1561 token = expect(token->next, '(', "after attribute");
1562 token = expect(token, '(', "after attribute");
1563 for (;;) {
1564 if (eof_token(token))
1565 break;
1566 if (match_op(token, ';'))
1567 break;
1568 if (token_type(token) != TOKEN_IDENT)
1569 break;
1570 token = skip_attribute(token);
1571 if (!match_op(token, ','))
1572 break;
1573 token = token->next;
1574 }
1575 token = expect(token, ')', "after attribute");
1576 token = expect(token, ')', "after attribute");
1577 }
1578 return token;
1579 }
1580
1581 static struct token *handle_attributes(struct token *token, struct decl_state *ctx, unsigned int keywords)
1582 {
1583 struct symbol *keyword;
1584 for (;;) {
1585 if (token_type(token) != TOKEN_IDENT)
1586 break;
1587 keyword = lookup_keyword(token->ident, NS_KEYWORD | NS_TYPEDEF);
1588 if (!keyword || keyword->type != SYM_KEYWORD)
1589 break;
1590 if (!(keyword->op->type & keywords))
1591 break;
1592 token = keyword->op->declarator(token->next, ctx);
1593 keywords &= KW_ATTRIBUTE;
1594 }
1595 return token;
1596 }
1597
1598 static int is_nested(struct token *token, struct token **p,
1599 int prefer_abstract)
1600 {
1601 /*
1602 * This can be either a parameter list or a grouping.
1603 * For the direct (non-abstract) case, we know if must be
1604 * a parameter list if we already saw the identifier.
1605 * For the abstract case, we know if must be a parameter
1606 * list if it is empty or starts with a type.
1607 */
1608 struct token *next = token->next;
1609
1610 *p = next = skip_attributes(next);
1611
1612 if (token_type(next) == TOKEN_IDENT) {
1613 if (lookup_type(next))
1614 return !prefer_abstract;
1615 return 1;
1616 }
1617
1618 if (match_op(next, ')') || match_op(next, SPECIAL_ELLIPSIS))
1619 return 0;
1620
1621 return 1;
1622 }
1623
1624 enum kind {
1625 Empty, K_R, Proto, Bad_Func,
1626 };
1627
1628 static enum kind which_func(struct token *token,
1629 struct ident **n,
1630 int prefer_abstract)
1631 {
1632 struct token *next = token->next;
1633
1634 if (token_type(next) == TOKEN_IDENT) {
1635 if (lookup_type(next))
1636 return Proto;
1637 /* identifier list not in definition; complain */
1638 if (prefer_abstract)
1639 warning(token->pos,
1640 "identifier list not in definition");
1641 return K_R;
1642 }
1643
1644 if (token_type(next) != TOKEN_SPECIAL)
1645 return Bad_Func;
1646
1647 if (next->special == ')') {
1648 /* don't complain about those */
1649 if (!n || match_op(next->next, ';'))
1650 return Empty;
1651 warning(next->pos,
1652 "non-ANSI function declaration of function '%s'",
1653 show_ident(*n));
1654 return Empty;
1655 }
1656
1657 if (next->special == SPECIAL_ELLIPSIS) {
1658 warning(next->pos,
1659 "variadic functions must have one named argument");
1660 return Proto;
1661 }
1662
1663 return Bad_Func;
1664 }
1665
1666 static struct token *direct_declarator(struct token *token, struct decl_state *ctx)
1667 {
1668 struct ctype *ctype = &ctx->ctype;
1669 struct token *next;
1670 struct ident **p = ctx->ident;
1671
1672 if (ctx->ident && token_type(token) == TOKEN_IDENT) {
1673 *ctx->ident = token->ident;
1674 token = token->next;
1675 } else if (match_op(token, '(') &&
1676 is_nested(token, &next, ctx->prefer_abstract)) {
1677 struct symbol *base_type = ctype->base_type;
1678 if (token->next != next)
1679 next = handle_attributes(token->next, ctx,
1680 KW_ATTRIBUTE);
1681 token = declarator(next, ctx);
1682 token = expect(token, ')', "in nested declarator");
1683 while (ctype->base_type != base_type)
1684 ctype = &ctype->base_type->ctype;
1685 p = NULL;
1686 }
1687
1688 if (match_op(token, '(')) {
1689 enum kind kind = which_func(token, p, ctx->prefer_abstract);
1690 struct symbol *fn;
1691 fn = alloc_indirect_symbol(token->pos, ctype, SYM_FN);
1692 token = token->next;
1693 if (kind == K_R)
1694 token = identifier_list(token, fn);
1695 else if (kind == Proto)
1696 token = parameter_type_list(token, fn);
1697 token = expect(token, ')', "in function declarator");
1698 fn->endpos = token->pos;
1699 return token;
1700 }
1701
1702 while (match_op(token, '[')) {
1703 struct symbol *array;
1704 array = alloc_indirect_symbol(token->pos, ctype, SYM_ARRAY);
1705 token = abstract_array_declarator(token->next, array);
1706 token = expect(token, ']', "in abstract_array_declarator");
1707 array->endpos = token->pos;
1708 ctype = &array->ctype;
1709 }
1710 return token;
1711 }
1712
1713 static struct token *pointer(struct token *token, struct decl_state *ctx)
1714 {
1715 while (match_op(token,'*')) {
1716 struct symbol *ptr = alloc_symbol(token->pos, SYM_PTR);
1717 ptr->ctype.modifiers = ctx->ctype.modifiers;
1718 ptr->ctype.base_type = ctx->ctype.base_type;
1719 merge_attr(&ptr->ctype, &ctx->ctype);
1720 ctx->ctype.modifiers = 0;
1721 ctx->ctype.base_type = ptr;
1722 ctx->ctype.attribute = &null_attr;
1723 ctx->ctype.alignment = 0;
1724
1725 token = handle_qualifiers(token->next, ctx);
1726 ctx->ctype.base_type->endpos = token->pos;
1727 }
1728 return token;
1729 }
1730
1731 static struct token *declarator(struct token *token, struct decl_state *ctx)
1732 {
1733 token = pointer(token, ctx);
1734 return direct_declarator(token, ctx);
1735 }
1736
1737 static struct token *handle_bitfield(struct token *token, struct decl_state *ctx)
1738 {
1739 struct ctype *ctype = &ctx->ctype;
1740 struct expression *expr;
1741 struct symbol *bitfield;
1742 long long width;
1743
1744 if (ctype->base_type != &int_type && !is_int_type(ctype->base_type)) {
1745 sparse_error(token->pos, "invalid bitfield specifier for type %s.",
1746 show_typename(ctype->base_type));
1747 // Parse this to recover gracefully.
1748 return conditional_expression(token->next, &expr);
1749 }
1750
1751 bitfield = alloc_indirect_symbol(token->pos, ctype, SYM_BITFIELD);
1752 token = conditional_expression(token->next, &expr);
1753 width = const_expression_value(expr);
1754 bitfield->bit_size = width;
1755
1756 if (width < 0 || width > INT_MAX) {
1757 sparse_error(token->pos, "invalid bitfield width, %lld.", width);
1758 width = -1;
1759 } else if (*ctx->ident && width == 0) {
1760 sparse_error(token->pos, "invalid named zero-width bitfield `%s'",
1761 show_ident(*ctx->ident));
1762 width = -1;
1763 } else if (*ctx->ident) {
1764 struct symbol *base_type = bitfield->ctype.base_type;
1765 struct symbol *bitfield_type = base_type == &int_type ? bitfield : base_type;
1766 int is_signed = !(bitfield_type->ctype.modifiers & MOD_UNSIGNED);
1767 if (Wone_bit_signed_bitfield && width == 1 && is_signed) {
1768 // Valid values are either {-1;0} or {0}, depending on integer
1769 // representation. The latter makes for very efficient code...
1770 sparse_error(token->pos, "dubious one-bit signed bitfield");
1771 }
1772 if (Wdefault_bitfield_sign &&
1773 bitfield_type->type != SYM_ENUM &&
1774 !(bitfield_type->ctype.modifiers & MOD_EXPLICITLY_SIGNED) &&
1775 is_signed) {
1776 // The sign of bitfields is unspecified by default.
1777 warning(token->pos, "dubious bitfield without explicit `signed' or `unsigned'");
1778 }
1779 }
1780 bitfield->bit_size = width;
1781 bitfield->endpos = token->pos;
1782 return token;
1783 }
1784
1785 static struct token *declaration_list(struct token *token, struct symbol_list **list)
1786 {
1787 struct decl_state ctx = {.prefer_abstract = 0, .ctype.attribute = &null_attr};
1788 struct ctype saved;
1789 unsigned long mod;
1790
1791 token = declaration_specifiers(token, &ctx);
1792 mod = storage_modifiers(&ctx);
1793 saved = ctx.ctype;
1794 for (;;) {
1795 struct symbol *decl = alloc_symbol(token->pos, SYM_NODE);
1796 ctx.ident = &decl->ident;
1797
1798 token = declarator(token, &ctx);
1799 if (match_op(token, ':'))
1800 token = handle_bitfield(token, &ctx);
1801
1802 token = handle_attributes(token, &ctx, KW_ATTRIBUTE);
1803 apply_modifiers(token->pos, &ctx);
1804
1805 decl->ctype = ctx.ctype;
1806 decl->ctype.modifiers |= mod;
1807 decl->endpos = token->pos;
1808 add_symbol(list, decl);
1809 if (!match_op(token, ','))
1810 break;
1811 token = token->next;
1812 ctx.ctype = saved;
1813 }
1814 return token;
1815 }
1816
1817 static struct token *struct_declaration_list(struct token *token, struct symbol_list **list)
1818 {
1819 while (!match_op(token, '}')) {
1820 if (!match_op(token, ';'))
1821 token = declaration_list(token, list);
1822 if (!match_op(token, ';')) {
1823 sparse_error(token->pos, "expected ; at end of declaration");
1824 break;
1825 }
1826 token = token->next;
1827 }
1828 return token;
1829 }
1830
1831 static struct token *parameter_declaration(struct token *token, struct symbol *sym)
1832 {
1833 struct decl_state ctx = {.prefer_abstract = 1, .ctype.attribute = &null_attr};
1834
1835 token = declaration_specifiers(token, &ctx);
1836 ctx.ident = &sym->ident;
1837 token = declarator(token, &ctx);
1838 token = handle_attributes(token, &ctx, KW_ATTRIBUTE);
1839 apply_modifiers(token->pos, &ctx);
1840 sym->ctype = ctx.ctype;
1841 sym->ctype.modifiers |= storage_modifiers(&ctx);
1842 sym->endpos = token->pos;
1843 return token;
1844 }
1845
1846 struct token *typename(struct token *token, struct symbol **p, int *forced)
1847 {
1848 struct decl_state ctx = {.prefer_abstract = 1, .ctype.attribute = &null_attr};
1849 int class;
1850 struct symbol *sym = alloc_symbol(token->pos, SYM_NODE);
1851 *p = sym;
1852 token = declaration_specifiers(token, &ctx);
1853 token = declarator(token, &ctx);
1854 apply_modifiers(token->pos, &ctx);
1855 sym->ctype = ctx.ctype;
1856 sym->endpos = token->pos;
1857 class = ctx.storage_class;
1858 if (forced) {
1859 *forced = 0;
1860 if (class == SForced) {
1861 *forced = 1;
1862 class = 0;
1863 }
1864 }
1865 if (class)
1866 warning(sym->pos, "storage class in typename (%s %s)",
1867 storage_class[class], show_typename(sym));
1868 return token;
1869 }
1870
1871 static struct token *expression_statement(struct token *token, struct expression **tree)
1872 {
1873 token = parse_expression(token, tree);
1874 return expect(token, ';', "at end of statement");
1875 }
1876
1877 static struct token *parse_asm_operands(struct token *token, struct statement *stmt,
1878 struct expression_list **inout)
1879 {
1880 struct expression *expr;
1881
1882 /* Allow empty operands */
1883 if (match_op(token->next, ':') || match_op(token->next, ')'))
1884 return token->next;
1885 do {
1886 struct ident *ident = NULL;
1887 if (match_op(token->next, '[') &&
1888 token_type(token->next->next) == TOKEN_IDENT &&
1889 match_op(token->next->next->next, ']')) {
1890 ident = token->next->next->ident;
1891 token = token->next->next->next;
1892 }
1893 add_expression(inout, (struct expression *)ident); /* UGGLEE!!! */
1894 token = primary_expression(token->next, &expr);
1895 add_expression(inout, expr);
1896 token = parens_expression(token, &expr, "in asm parameter");
1897 add_expression(inout, expr);
1898 } while (match_op(token, ','));
1899 return token;
1900 }
1901
1902 static struct token *parse_asm_clobbers(struct token *token, struct statement *stmt,
1903 struct expression_list **clobbers)
1904 {
1905 struct expression *expr;
1906
1907 do {
1908 token = primary_expression(token->next, &expr);
1909 if (expr)
1910 add_expression(clobbers, expr);
1911 } while (match_op(token, ','));
1912 return token;
1913 }
1914
1915 static struct token *parse_asm_labels(struct token *token, struct statement *stmt,
1916 struct symbol_list **labels)
1917 {
1918 struct symbol *label;
1919
1920 do {
1921 token = token->next; /* skip ':' and ',' */
1922 if (token_type(token) != TOKEN_IDENT)
1923 return token;
1924 label = label_symbol(token);
1925 add_symbol(labels, label);
1926 token = token->next;
1927 } while (match_op(token, ','));
1928 return token;
1929 }
1930
1931 static struct token *parse_asm_statement(struct token *token, struct statement *stmt)
1932 {
1933 int is_goto = 0;
1934
1935 token = token->next;
1936 stmt->type = STMT_ASM;
1937 if (match_idents(token, &__volatile___ident, &__volatile_ident, &volatile_ident, NULL)) {
1938 token = token->next;
1939 }
1940 if (token_type(token) == TOKEN_IDENT && token->ident == &goto_ident) {
1941 is_goto = 1;
1942 token = token->next;
1943 }
1944 token = expect(token, '(', "after asm");
1945 token = parse_expression(token, &stmt->asm_string);
1946 if (match_op(token, ':'))
1947 token = parse_asm_operands(token, stmt, &stmt->asm_outputs);
1948 if (match_op(token, ':'))
1949 token = parse_asm_operands(token, stmt, &stmt->asm_inputs);
1950 if (match_op(token, ':'))
1951 token = parse_asm_clobbers(token, stmt, &stmt->asm_clobbers);
1952 if (is_goto && match_op(token, ':'))
1953 token = parse_asm_labels(token, stmt, &stmt->asm_labels);
1954 token = expect(token, ')', "after asm");
1955 return expect(token, ';', "at end of asm-statement");
1956 }
1957
1958 static struct token *parse_asm_declarator(struct token *token, struct decl_state *ctx)
1959 {
1960 struct expression *expr;
1961 token = expect(token, '(', "after asm");
1962 token = parse_expression(token->next, &expr);
1963 token = expect(token, ')', "after asm");
1964 return token;
1965 }
1966
1967 /* Make a statement out of an expression */
1968 static struct statement *make_statement(struct expression *expr)
1969 {
1970 struct statement *stmt;
1971
1972 if (!expr)
1973 return NULL;
1974 stmt = alloc_statement(expr->pos, STMT_EXPRESSION);
1975 stmt->expression = expr;
1976 return stmt;
1977 }
1978
1979 /*
1980 * All iterators have two symbols associated with them:
1981 * the "continue" and "break" symbols, which are targets
1982 * for continue and break statements respectively.
1983 *
1984 * They are in a special name-space, but they follow
1985 * all the normal visibility rules, so nested iterators
1986 * automatically work right.
1987 */
1988 static void start_iterator(struct statement *stmt)
1989 {
1990 struct symbol *cont, *brk;
1991
1992 start_symbol_scope(stmt->pos);
1993 cont = alloc_symbol(stmt->pos, SYM_NODE);
1994 cont->stmt = stmt;
1995 bind_symbol(cont, &continue_ident, NS_ITERATOR);
1996 brk = alloc_symbol(stmt->pos, SYM_NODE);
1997 brk->stmt = stmt;
1998 bind_symbol(brk, &break_ident, NS_ITERATOR);
1999
2000 stmt->type = STMT_ITERATOR;
2001 stmt->iterator_break = brk;
2002 stmt->iterator_continue = cont;
2003 fn_local_symbol(brk);
2004 fn_local_symbol(cont);
2005 }
2006
2007 static void end_iterator(struct statement *stmt)
2008 {
2009 end_symbol_scope();
2010 }
2011
2012 static struct statement *start_function(struct symbol *sym)
2013 {
2014 struct symbol *ret;
2015 struct statement *stmt = alloc_statement(sym->pos, STMT_COMPOUND);
2016
2017 start_function_scope(stmt->pos);
2018 ret = alloc_symbol(sym->pos, SYM_NODE);
2019 ret->ctype = sym->ctype.base_type->ctype;
2020 ret->ctype.modifiers &= ~(MOD_STORAGE | MOD_CONST | MOD_VOLATILE | MOD_TLS | MOD_INLINE | MOD_ADDRESSABLE | MOD_NOCAST | MOD_NODEREF | MOD_ACCESSED | MOD_TOPLEVEL);
2021 ret->ctype.modifiers |= (MOD_AUTO | MOD_REGISTER);
2022 bind_symbol(ret, &return_ident, NS_ITERATOR);
2023 stmt->ret = ret;
2024 fn_local_symbol(ret);
2025
2026 // Currently parsed symbol for __func__/__FUNCTION__/__PRETTY_FUNCTION__
2027 current_fn = sym;
2028
2029 return stmt;
2030 }
2031
2032 static void end_function(struct symbol *sym)
2033 {
2034 current_fn = NULL;
2035 end_function_scope();
2036 }
2037
2038 /*
2039 * A "switch()" statement, like an iterator, has a
2040 * the "break" symbol associated with it. It works
2041 * exactly like the iterator break - it's the target
2042 * for any break-statements in scope, and means that
2043 * "break" handling doesn't even need to know whether
2044 * it's breaking out of an iterator or a switch.
2045 *
2046 * In addition, the "case" symbol is a marker for the
2047 * case/default statements to find the switch statement
2048 * that they are associated with.
2049 */
2050 static void start_switch(struct statement *stmt)
2051 {
2052 struct symbol *brk, *switch_case;
2053
2054 start_symbol_scope(stmt->pos);
2055 brk = alloc_symbol(stmt->pos, SYM_NODE);
2056 brk->stmt = stmt;
2057 bind_symbol(brk, &break_ident, NS_ITERATOR);
2058
2059 switch_case = alloc_symbol(stmt->pos, SYM_NODE);
2060 bind_symbol(switch_case, &case_ident, NS_ITERATOR);
2061 switch_case->stmt = stmt;
2062
2063 stmt->type = STMT_SWITCH;
2064 stmt->switch_break = brk;
2065 stmt->switch_case = switch_case;
2066
2067 fn_local_symbol(brk);
2068 fn_local_symbol(switch_case);
2069 }
2070
2071 static void end_switch(struct statement *stmt)
2072 {
2073 if (!stmt->switch_case->symbol_list)
2074 warning(stmt->pos, "switch with no cases");
2075 end_symbol_scope();
2076 }
2077
2078 static void add_case_statement(struct statement *stmt)
2079 {
2080 struct symbol *target = lookup_symbol(&case_ident, NS_ITERATOR);
2081 struct symbol *sym;
2082
2083 if (!target) {
2084 sparse_error(stmt->pos, "not in switch scope");
2085 stmt->type = STMT_NONE;
2086 return;
2087 }
2088 sym = alloc_symbol(stmt->pos, SYM_NODE);
2089 add_symbol(&target->symbol_list, sym);
2090 sym->stmt = stmt;
2091 stmt->case_label = sym;
2092 fn_local_symbol(sym);
2093 }
2094
2095 static struct token *parse_return_statement(struct token *token, struct statement *stmt)
2096 {
2097 struct symbol *target = lookup_symbol(&return_ident, NS_ITERATOR);
2098
2099 if (!target)
2100 error_die(token->pos, "internal error: return without a function target");
2101 stmt->type = STMT_RETURN;
2102 stmt->ret_target = target;
2103 return expression_statement(token->next, &stmt->ret_value);
2104 }
2105
2106 static struct token *parse_for_statement(struct token *token, struct statement *stmt)
2107 {
2108 struct symbol_list *syms;
2109 struct expression *e1, *e2, *e3;
2110 struct statement *iterator;
2111
2112 start_iterator(stmt);
2113 token = expect(token->next, '(', "after 'for'");
2114
2115 syms = NULL;
2116 e1 = NULL;
2117 /* C99 variable declaration? */
2118 if (lookup_type(token)) {
2119 token = external_declaration(token, &syms);
2120 } else {
2121 token = parse_expression(token, &e1);
2122 token = expect(token, ';', "in 'for'");
2123 }
2124 token = parse_expression(token, &e2);
2125 token = expect(token, ';', "in 'for'");
2126 token = parse_expression(token, &e3);
2127 token = expect(token, ')', "in 'for'");
2128 token = statement(token, &iterator);
2129
2130 stmt->iterator_syms = syms;
2131 stmt->iterator_pre_statement = make_statement(e1);
2132 stmt->iterator_pre_condition = e2;
2133 stmt->iterator_post_statement = make_statement(e3);
2134 stmt->iterator_post_condition = NULL;
2135 stmt->iterator_statement = iterator;
2136 end_iterator(stmt);
2137
2138 return token;
2139 }
2140
2141 static struct token *parse_while_statement(struct token *token, struct statement *stmt)
2142 {
2143 struct expression *expr;
2144 struct statement *iterator;
2145
2146 start_iterator(stmt);
2147 token = parens_expression(token->next, &expr, "after 'while'");
2148 token = statement(token, &iterator);
2149
2150 stmt->iterator_pre_condition = expr;
2151 stmt->iterator_post_condition = NULL;
2152 stmt->iterator_statement = iterator;
2153 end_iterator(stmt);
2154
2155 return token;
2156 }
2157
2158 static struct token *parse_do_statement(struct token *token, struct statement *stmt)
2159 {
2160 struct expression *expr;
2161 struct statement *iterator;
2162
2163 start_iterator(stmt);
2164 token = statement(token->next, &iterator);
2165 if (token_type(token) == TOKEN_IDENT && token->ident == &while_ident)
2166 token = token->next;
2167 else
2168 sparse_error(token->pos, "expected 'while' after 'do'");
2169 token = parens_expression(token, &expr, "after 'do-while'");
2170
2171 stmt->iterator_post_condition = expr;
2172 stmt->iterator_statement = iterator;
2173 end_iterator(stmt);
2174
2175 if (iterator && iterator->type != STMT_COMPOUND && Wdo_while)
2176 warning(iterator->pos, "do-while statement is not a compound statement");
2177
2178 return expect(token, ';', "after statement");
2179 }
2180
2181 static struct token *parse_if_statement(struct token *token, struct statement *stmt)
2182 {
2183 stmt->type = STMT_IF;
2184 token = parens_expression(token->next, &stmt->if_conditional, "after if");
2185 token = statement(token, &stmt->if_true);
2186 if (token_type(token) != TOKEN_IDENT)
2187 return token;
2188 if (token->ident != &else_ident)
2189 return token;
2190 return statement(token->next, &stmt->if_false);
2191 }
2192
2193 static inline struct token *case_statement(struct token *token, struct statement *stmt)
2194 {
2195 stmt->type = STMT_CASE;
2196 token = expect(token, ':', "after default/case");
2197 add_case_statement(stmt);
2198 return statement(token, &stmt->case_statement);
2199 }
2200
2201 static struct token *parse_case_statement(struct token *token, struct statement *stmt)
2202 {
2203 token = parse_expression(token->next, &stmt->case_expression);
2204 if (match_op(token, SPECIAL_ELLIPSIS))
2205 token = parse_expression(token->next, &stmt->case_to);
2206 return case_statement(token, stmt);
2207 }
2208
2209 static struct token *parse_default_statement(struct token *token, struct statement *stmt)
2210 {
2211 return case_statement(token->next, stmt);
2212 }
2213
2214 static struct token *parse_loop_iterator(struct token *token, struct statement *stmt)
2215 {
2216 struct symbol *target = lookup_symbol(token->ident, NS_ITERATOR);
2217 stmt->type = STMT_GOTO;
2218 stmt->goto_label = target;
2219 if (!target)
2220 sparse_error(stmt->pos, "break/continue not in iterator scope");
2221 return expect(token->next, ';', "at end of statement");
2222 }
2223
2224 static struct token *parse_switch_statement(struct token *token, struct statement *stmt)
2225 {
2226 stmt->type = STMT_SWITCH;
2227 start_switch(stmt);
2228 token = parens_expression(token->next, &stmt->switch_expression, "after 'switch'");
2229 token = statement(token, &stmt->switch_statement);
2230 end_switch(stmt);
2231 return token;
2232 }
2233
2234 static struct token *parse_goto_statement(struct token *token, struct statement *stmt)
2235 {
2236 stmt->type = STMT_GOTO;
2237 token = token->next;
2238 if (match_op(token, '*')) {
2239 token = parse_expression(token->next, &stmt->goto_expression);
2240 add_statement(&function_computed_goto_list, stmt);
2241 } else if (token_type(token) == TOKEN_IDENT) {
2242 stmt->goto_label = label_symbol(token);
2243 token = token->next;
2244 } else {
2245 sparse_error(token->pos, "Expected identifier or goto expression");
2246 }
2247 return expect(token, ';', "at end of statement");
2248 }
2249
2250 static struct token *parse_context_statement(struct token *token, struct statement *stmt)
2251 {
2252 stmt->type = STMT_CONTEXT;
2253 token = parse_expression(token->next, &stmt->expression);
2254 if (stmt->expression->type == EXPR_PREOP
2255 && stmt->expression->op == '('
2256 && stmt->expression->unop->type == EXPR_COMMA) {
2257 struct expression *expr;
2258 expr = stmt->expression->unop;
2259 stmt->context = expr->left;
2260 stmt->expression = expr->right;
2261 }
2262 return expect(token, ';', "at end of statement");
2263 }
2264
2265 static struct token *parse_range_statement(struct token *token, struct statement *stmt)
2266 {
2267 stmt->type = STMT_RANGE;
2268 token = assignment_expression(token->next, &stmt->range_expression);
2269 token = expect(token, ',', "after range expression");
2270 token = assignment_expression(token, &stmt->range_low);
2271 token = expect(token, ',', "after low range");
2272 token = assignment_expression(token, &stmt->range_high);
2273 return expect(token, ';', "after range statement");
2274 }
2275
2276 static struct token *statement(struct token *token, struct statement **tree)
2277 {
2278 struct statement *stmt = alloc_statement(token->pos, STMT_NONE);
2279
2280 *tree = stmt;
2281 if (token_type(token) == TOKEN_IDENT) {
2282 struct symbol *s = lookup_keyword(token->ident, NS_KEYWORD);
2283 if (s && s->op->statement)
2284 return s->op->statement(token, stmt);
2285
2286 if (match_op(token->next, ':')) {
2287 struct symbol *s = label_symbol(token);
2288 stmt->type = STMT_LABEL;
2289 stmt->label_identifier = s;
2290 if (s->stmt)
2291 sparse_error(stmt->pos, "label '%s' redefined", show_ident(token->ident));
2292 s->stmt = stmt;
2293 token = skip_attributes(token->next->next);
2294 return statement(token, &stmt->label_statement);
2295 }
2296 }
2297
2298 if (match_op(token, '{')) {
2299 stmt->type = STMT_COMPOUND;
2300 start_symbol_scope(stmt->pos);
2301 token = compound_statement(token->next, stmt);
2302 end_symbol_scope();
2303
2304 return expect(token, '}', "at end of compound statement");
2305 }
2306
2307 stmt->type = STMT_EXPRESSION;
2308 return expression_statement(token, &stmt->expression);
2309 }
2310
2311 /* gcc extension - __label__ ident-list; in the beginning of compound stmt */
2312 static struct token *label_statement(struct token *token)
2313 {
2314 while (token_type(token) == TOKEN_IDENT) {
2315 struct symbol *sym = alloc_symbol(token->pos, SYM_LABEL);
2316 /* it's block-scope, but we want label namespace */
2317 bind_symbol(sym, token->ident, NS_SYMBOL);
2318 sym->namespace = NS_LABEL;
2319 fn_local_symbol(sym);
2320 token = token->next;
2321 if (!match_op(token, ','))
2322 break;
2323 token = token->next;
2324 }
2325 return expect(token, ';', "at end of label declaration");
2326 }
2327
2328 static struct token * statement_list(struct token *token, struct statement_list **list)
2329 {
2330 int seen_statement = 0;
2331 while (token_type(token) == TOKEN_IDENT &&
2332 token->ident == &__label___ident)
2333 token = label_statement(token->next);
2334 for (;;) {
2335 struct statement * stmt;
2336 if (eof_token(token))
2337 break;
2338 if (match_op(token, '}'))
2339 break;
2340 if (lookup_type(token)) {
2341 if (seen_statement) {
2342 warning(token->pos, "mixing declarations and code");
2343 seen_statement = 0;
2344 }
2345 stmt = alloc_statement(token->pos, STMT_DECLARATION);
2346 token = external_declaration(token, &stmt->declaration);
2347 } else {
2348 seen_statement = Wdeclarationafterstatement;
2349 token = statement(token, &stmt);
2350 }
2351 add_statement(list, stmt);
2352 }
2353 return token;
2354 }
2355
2356 static struct token *identifier_list(struct token *token, struct symbol *fn)
2357 {
2358 struct symbol_list **list = &fn->arguments;
2359 for (;;) {
2360 struct symbol *sym = alloc_symbol(token->pos, SYM_NODE);
2361 sym->ident = token->ident;
2362 token = token->next;
2363 sym->endpos = token->pos;
2364 sym->ctype.base_type = &incomplete_ctype;
2365 add_symbol(list, sym);
2366 if (!match_op(token, ',') ||
2367 token_type(token->next) != TOKEN_IDENT ||
2368 lookup_type(token->next))
2369 break;
2370 token = token->next;
2371 }
2372 return token;
2373 }
2374
2375 static struct token *parameter_type_list(struct token *token, struct symbol *fn)
2376 {
2377 struct symbol_list **list = &fn->arguments;
2378
2379 for (;;) {
2380 struct symbol *sym;
2381
2382 if (match_op(token, SPECIAL_ELLIPSIS)) {
2383 fn->variadic = 1;
2384 token = token->next;
2385 break;
2386 }
2387
2388 sym = alloc_symbol(token->pos, SYM_NODE);
2389 token = parameter_declaration(token, sym);
2390 if (sym->ctype.base_type == &void_ctype) {
2391 /* Special case: (void) */
2392 if (!*list && !sym->ident)
2393 break;
2394 warning(token->pos, "void parameter");
2395 }
2396 add_symbol(list, sym);
2397 if (!match_op(token, ','))
2398 break;
2399 token = token->next;
2400 }
2401 return token;
2402 }
2403
2404 struct token *compound_statement(struct token *token, struct statement *stmt)
2405 {
2406 token = statement_list(token, &stmt->stmts);
2407 return token;
2408 }
2409
2410 static struct expression *identifier_expression(struct token *token)
2411 {
2412 struct expression *expr = alloc_expression(token->pos, EXPR_IDENTIFIER);
2413 expr->expr_ident = token->ident;
2414 return expr;
2415 }
2416
2417 static struct expression *index_expression(struct expression *from, struct expression *to)
2418 {
2419 int idx_from, idx_to;
2420 struct expression *expr = alloc_expression(from->pos, EXPR_INDEX);
2421
2422 idx_from = const_expression_value(from);
2423 idx_to = idx_from;
2424 if (to) {
2425 idx_to = const_expression_value(to);
2426 if (idx_to < idx_from || idx_from < 0)
2427 warning(from->pos, "nonsense array initializer index range");
2428 }
2429 expr->idx_from = idx_from;
2430 expr->idx_to = idx_to;
2431 return expr;
2432 }
2433
2434 static struct token *single_initializer(struct expression **ep, struct token *token)
2435 {
2436 int expect_equal = 0;
2437 struct token *next = token->next;
2438 struct expression **tail = ep;
2439 int nested;
2440
2441 *ep = NULL;
2442
2443 if ((token_type(token) == TOKEN_IDENT) && match_op(next, ':')) {
2444 struct expression *expr = identifier_expression(token);
2445 if (Wold_initializer)
2446 warning(token->pos, "obsolete struct initializer, use C99 syntax");
2447 token = initializer(&expr->ident_expression, next->next);
2448 if (expr->ident_expression)
2449 *ep = expr;
2450 return token;
2451 }
2452
2453 for (tail = ep, nested = 0; ; nested++, next = token->next) {
2454 if (match_op(token, '.') && (token_type(next) == TOKEN_IDENT)) {
2455 struct expression *expr = identifier_expression(next);
2456 *tail = expr;
2457 tail = &expr->ident_expression;
2458 expect_equal = 1;
2459 token = next->next;
2460 } else if (match_op(token, '[')) {
2461 struct expression *from = NULL, *to = NULL, *expr;
2462 token = constant_expression(token->next, &from);
2463 if (!from) {
2464 sparse_error(token->pos, "Expected constant expression");
2465 break;
2466 }
2467 if (match_op(token, SPECIAL_ELLIPSIS))
2468 token = constant_expression(token->next, &to);
2469 expr = index_expression(from, to);
2470 *tail = expr;
2471 tail = &expr->idx_expression;
2472 token = expect(token, ']', "at end of initializer index");
2473 if (nested)
2474 expect_equal = 1;
2475 } else {
2476 break;
2477 }
2478 }
2479 if (nested && !expect_equal) {
2480 if (!match_op(token, '='))
2481 warning(token->pos, "obsolete array initializer, use C99 syntax");
2482 else
2483 expect_equal = 1;
2484 }
2485 if (expect_equal)
2486 token = expect(token, '=', "at end of initializer index");
2487
2488 token = initializer(tail, token);
2489 if (!*tail)
2490 *ep = NULL;
2491 return token;
2492 }
2493
2494 static struct token *initializer_list(struct expression_list **list, struct token *token)
2495 {
2496 struct expression *expr;
2497
2498 for (;;) {
2499 token = single_initializer(&expr, token);
2500 if (!expr)
2501 break;
2502 add_expression(list, expr);
2503 if (!match_op(token, ','))
2504 break;
2505 token = token->next;
2506 }
2507 return token;
2508 }
2509
2510 struct token *initializer(struct expression **tree, struct token *token)
2511 {
2512 if (match_op(token, '{')) {
2513 struct expression *expr = alloc_expression(token->pos, EXPR_INITIALIZER);
2514 *tree = expr;
2515 token = initializer_list(&expr->expr_list, token->next);
2516 return expect(token, '}', "at end of initializer");
2517 }
2518 return assignment_expression(token, tree);
2519 }
2520
2521 static void declare_argument(struct symbol *sym, struct symbol *fn)
2522 {
2523 if (!sym->ident) {
2524 sparse_error(sym->pos, "no identifier for function argument");
2525 return;
2526 }
2527 bind_symbol(sym, sym->ident, NS_SYMBOL);
2528 }
2529
2530 static struct token *parse_function_body(struct token *token, struct symbol *decl,
2531 struct symbol_list **list)
2532 {
2533 struct symbol_list **old_symbol_list;
2534 struct symbol *base_type = decl->ctype.base_type;
2535 struct statement *stmt, **p;
2536 struct symbol *prev;
2537 struct symbol *arg;
2538
2539 old_symbol_list = function_symbol_list;
2540 if (decl->ctype.modifiers & MOD_INLINE) {
2541 function_symbol_list = &decl->inline_symbol_list;
2542 p = &base_type->inline_stmt;
2543 } else {
2544 function_symbol_list = &decl->symbol_list;
2545 p = &base_type->stmt;
2546 }
2547 function_computed_target_list = NULL;
2548 function_computed_goto_list = NULL;
2549
2550 if (decl->ctype.modifiers & MOD_EXTERN) {
2551 if (!(decl->ctype.modifiers & MOD_INLINE))
2552 warning(decl->pos, "function '%s' with external linkage has definition", show_ident(decl->ident));
2553 }
2554 if (!(decl->ctype.modifiers & MOD_STATIC))
2555 decl->ctype.modifiers |= MOD_EXTERN;
2556
2557 stmt = start_function(decl);
2558
2559 *p = stmt;
2560 FOR_EACH_PTR (base_type->arguments, arg) {
2561 declare_argument(arg, base_type);
2562 } END_FOR_EACH_PTR(arg);
2563
2564 token = compound_statement(token->next, stmt);
2565
2566 end_function(decl);
2567 if (!(decl->ctype.modifiers & MOD_INLINE))
2568 add_symbol(list, decl);
2569 check_declaration(decl);
2570 decl->definition = decl;
2571 prev = decl->same_symbol;
2572 if (prev && prev->definition) {
2573 warning(decl->pos, "multiple definitions for function '%s'",
2574 show_ident(decl->ident));
2575 info(prev->definition->pos, " the previous one is here");
2576 } else {
2577 while (prev) {
2578 prev->definition = decl;
2579 prev = prev->same_symbol;
2580 }
2581 }
2582 function_symbol_list = old_symbol_list;
2583 if (function_computed_goto_list) {
2584 if (!function_computed_target_list)
2585 warning(decl->pos, "function '%s' has computed goto but no targets?", show_ident(decl->ident));
2586 else {
2587 FOR_EACH_PTR(function_computed_goto_list, stmt) {
2588 stmt->target_list = function_computed_target_list;
2589 } END_FOR_EACH_PTR(stmt);
2590 }
2591 }
2592 return expect(token, '}', "at end of function");
2593 }
2594
2595 static void promote_k_r_types(struct symbol *arg)
2596 {
2597 struct symbol *base = arg->ctype.base_type;
2598 if (base && base->ctype.base_type == &int_type && (base->ctype.modifiers & (MOD_CHAR | MOD_SHORT))) {
2599 arg->ctype.base_type = &int_ctype;
2600 }
2601 }
2602
2603 static void apply_k_r_types(struct symbol_list *argtypes, struct symbol *fn)
2604 {
2605 struct symbol_list *real_args = fn->ctype.base_type->arguments;
2606 struct symbol *arg;
2607
2608 FOR_EACH_PTR(real_args, arg) {
2609 struct symbol *type;
2610
2611 /* This is quadratic in the number of arguments. We _really_ don't care */
2612 FOR_EACH_PTR(argtypes, type) {
2613 if (type->ident == arg->ident)
2614 goto match;
2615 } END_FOR_EACH_PTR(type);
2616 sparse_error(arg->pos, "missing type declaration for parameter '%s'", show_ident(arg->ident));
2617 continue;
2618 match:
2619 type->used = 1;
2620 /* "char" and "short" promote to "int" */
2621 promote_k_r_types(type);
2622
2623 arg->ctype = type->ctype;
2624 } END_FOR_EACH_PTR(arg);
2625
2626 FOR_EACH_PTR(argtypes, arg) {
2627 if (!arg->used)
2628 warning(arg->pos, "nonsensical parameter declaration '%s'", show_ident(arg->ident));
2629 } END_FOR_EACH_PTR(arg);
2630
2631 }
2632
2633 static struct token *parse_k_r_arguments(struct token *token, struct symbol *decl,
2634 struct symbol_list **list)
2635 {
2636 struct symbol_list *args = NULL;
2637
2638 warning(token->pos, "non-ANSI definition of function '%s'", show_ident(decl->ident));
2639 do {
2640 token = declaration_list(token, &args);
2641 if (!match_op(token, ';')) {
2642 sparse_error(token->pos, "expected ';' at end of parameter declaration");
2643 break;
2644 }
2645 token = token->next;
2646 } while (lookup_type(token));
2647
2648 apply_k_r_types(args, decl);
2649
2650 if (!match_op(token, '{')) {
2651 sparse_error(token->pos, "expected function body");
2652 return token;
2653 }
2654 return parse_function_body(token, decl, list);
2655 }
2656
2657 static struct token *toplevel_asm_declaration(struct token *token, struct symbol_list **list)
2658 {
2659 struct symbol *anon = alloc_symbol(token->pos, SYM_NODE);
2660 struct symbol *fn = alloc_symbol(token->pos, SYM_FN);
2661 struct statement *stmt;
2662
2663 anon->ctype.base_type = fn;
2664 stmt = alloc_statement(token->pos, STMT_NONE);
2665 fn->stmt = stmt;
2666
2667 token = parse_asm_statement(token, stmt);
2668
2669 add_symbol(list, anon);
2670 return token;
2671 }
2672
2673 struct token *external_declaration(struct token *token, struct symbol_list **list)
2674 {
2675 struct ident *ident = NULL;
2676 struct symbol *decl;
2677 struct decl_state ctx = { .ident = &ident, .ctype.attribute = &null_attr};
2678 struct ctype saved;
2679 struct symbol *base_type;
2680 unsigned long mod;
2681 int is_typedef;
2682
2683 /* Top-level inline asm? */
2684 if (token_type(token) == TOKEN_IDENT) {
2685 struct symbol *s = lookup_keyword(token->ident, NS_KEYWORD);
2686 if (s && s->op->toplevel)
2687 return s->op->toplevel(token, list);
2688 }
2689
2690 /* Parse declaration-specifiers, if any */
2691 token = declaration_specifiers(token, &ctx);
2692 mod = storage_modifiers(&ctx);
2693 decl = alloc_symbol(token->pos, SYM_NODE);
2694 /* Just a type declaration? */
2695 if (match_op(token, ';')) {
2696 apply_modifiers(token->pos, &ctx);
2697 return token->next;
2698 }
2699
2700 saved = ctx.ctype;
2701 token = declarator(token, &ctx);
2702 token = handle_attributes(token, &ctx, KW_ATTRIBUTE | KW_ASM);
2703 apply_modifiers(token->pos, &ctx);
2704
2705 decl->ctype = ctx.ctype;
2706 decl->ctype.modifiers |= mod;
2707 decl->endpos = token->pos;
2708
2709 /* Just a type declaration? */
2710 if (!ident) {
2711 warning(token->pos, "missing identifier in declaration");
2712 return expect(token, ';', "at the end of type declaration");
2713 }
2714
2715 /* type define declaration? */
2716 is_typedef = ctx.storage_class == STypedef;
2717
2718 /* Typedefs don't have meaningful storage */
2719 if (is_typedef)
2720 decl->ctype.modifiers |= MOD_USERTYPE;
2721
2722 bind_symbol(decl, ident, is_typedef ? NS_TYPEDEF: NS_SYMBOL);
2723
2724 base_type = decl->ctype.base_type;
2725
2726 if (is_typedef) {
2727 if (base_type && !base_type->ident) {
2728 switch (base_type->type) {
2729 case SYM_STRUCT:
2730 case SYM_UNION:
2731 case SYM_ENUM:
2732 case SYM_RESTRICT:
2733 base_type->ident = ident;
2734 }
2735 }
2736 } else if (base_type && base_type->type == SYM_FN) {
2737 /* K&R argument declaration? */
2738 if (lookup_type(token))
2739 return parse_k_r_arguments(token, decl, list);
2740 if (match_op(token, '{'))
2741 return parse_function_body(token, decl, list);
2742
2743 if (!(decl->ctype.modifiers & MOD_STATIC))
2744 decl->ctype.modifiers |= MOD_EXTERN;
2745 } else if (base_type == &void_ctype && !(decl->ctype.modifiers & MOD_EXTERN)) {
2746 sparse_error(token->pos, "void declaration");
2747 }
2748
2749 for (;;) {
2750 if (!is_typedef && match_op(token, '=')) {
2751 if (decl->ctype.modifiers & MOD_EXTERN) {
2752 warning(decl->pos, "symbol with external linkage has initializer");
2753 decl->ctype.modifiers &= ~MOD_EXTERN;
2754 }
2755 token = initializer(&decl->initializer, token->next);
2756 }
2757 if (!is_typedef) {
2758 if (!(decl->ctype.modifiers & (MOD_EXTERN | MOD_INLINE))) {
2759 add_symbol(list, decl);
2760 fn_local_symbol(decl);
2761 }
2762 }
2763 check_declaration(decl);
2764 if (decl->same_symbol)
2765 decl->definition = decl->same_symbol->definition;
2766
2767 if (!match_op(token, ','))
2768 break;
2769
2770 token = token->next;
2771 ident = NULL;
2772 decl = alloc_symbol(token->pos, SYM_NODE);
2773 ctx.ctype = saved;
2774 token = handle_attributes(token, &ctx, KW_ATTRIBUTE);
2775 token = declarator(token, &ctx);
2776 token = handle_attributes(token, &ctx, KW_ATTRIBUTE | KW_ASM);
2777 apply_modifiers(token->pos, &ctx);
2778 decl->ctype = ctx.ctype;
2779 decl->ctype.modifiers |= mod;
2780 decl->endpos = token->pos;
2781 if (!ident) {
2782 sparse_error(token->pos, "expected identifier name in type definition");
2783 return token;
2784 }
2785
2786 if (is_typedef)
2787 decl->ctype.modifiers |= MOD_USERTYPE;
2788
2789 bind_symbol(decl, ident, is_typedef ? NS_TYPEDEF: NS_SYMBOL);
2790
2791 /* Function declarations are automatically extern unless specifically static */
2792 base_type = decl->ctype.base_type;
2793 if (!is_typedef && base_type && base_type->type == SYM_FN) {
2794 if (!(decl->ctype.modifiers & MOD_STATIC))
2795 decl->ctype.modifiers |= MOD_EXTERN;
2796 }
2797 }
2798 return expect(token, ';', "at end of declaration");
2799 }
Static analysis for C