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flow: tiny cleanup handling assignments
[smatch.git] / parse.c
blob1dd5c0cbff3245880f940491f6da8675bb1f96de
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
62 static struct token *parse_if_statement(struct token *token, struct statement *stmt);
63 static struct token *parse_return_statement(struct token *token, struct statement *stmt);
64 static struct token *parse_loop_iterator(struct token *token, struct statement *stmt);
65 static struct token *parse_default_statement(struct token *token, struct statement *stmt);
66 static struct token *parse_case_statement(struct token *token, struct statement *stmt);
67 static struct token *parse_switch_statement(struct token *token, struct statement *stmt);
68 static struct token *parse_for_statement(struct token *token, struct statement *stmt);
69 static struct token *parse_while_statement(struct token *token, struct statement *stmt);
70 static struct token *parse_do_statement(struct token *token, struct statement *stmt);
71 static struct token *parse_goto_statement(struct token *token, struct statement *stmt);
72 static struct token *parse_context_statement(struct token *token, struct statement *stmt);
73 static struct token *parse_range_statement(struct token *token, struct statement *stmt);
74 static struct token *parse_asm_statement(struct token *token, struct statement *stmt);
75 static struct token *toplevel_asm_declaration(struct token *token, struct symbol_list **list);
76
77 typedef struct token *attr_t(struct token *, struct symbol *,
78 struct decl_state *);
79
80 static attr_t
81 attribute_packed, attribute_aligned, attribute_modifier,
82 attribute_address_space, attribute_context,
83 attribute_designated_init,
84 attribute_transparent_union, ignore_attribute,
85 attribute_mode, attribute_force;
86
87 typedef struct symbol *to_mode_t(struct symbol *);
88
89 static to_mode_t
90 to_QI_mode, to_HI_mode, to_SI_mode, to_DI_mode, to_TI_mode, to_word_mode;
91
92 enum {
93 Set_T = 1,
94 Set_S = 2,
95 Set_Char = 4,
96 Set_Int = 8,
97 Set_Double = 16,
98 Set_Float = 32,
99 Set_Signed = 64,
100 Set_Unsigned = 128,
101 Set_Short = 256,
102 Set_Long = 512,
103 Set_Vlong = 1024,
104 Set_Any = Set_T | Set_Short | Set_Long | Set_Signed | Set_Unsigned
105 };
106
107 enum {
108 CInt = 0, CSInt, CUInt, CReal, CChar, CSChar, CUChar
109 };
110
111 enum {
112 SNone = 0, STypedef, SAuto, SRegister, SExtern, SStatic, SForced
113 };
114
115 static struct symbol_op typedef_op = {
116 .type = KW_MODIFIER,
117 .declarator = typedef_specifier,
118 };
119
120 static struct symbol_op inline_op = {
121 .type = KW_MODIFIER,
122 .declarator = inline_specifier,
123 };
124
125 static struct symbol_op auto_op = {
126 .type = KW_MODIFIER,
127 .declarator = auto_specifier,
128 };
129
130 static struct symbol_op register_op = {
131 .type = KW_MODIFIER,
132 .declarator = register_specifier,
133 };
134
135 static struct symbol_op static_op = {
136 .type = KW_MODIFIER,
137 .declarator = static_specifier,
138 };
139
140 static struct symbol_op extern_op = {
141 .type = KW_MODIFIER,
142 .declarator = extern_specifier,
143 };
144
145 static struct symbol_op thread_op = {
146 .type = KW_MODIFIER,
147 .declarator = thread_specifier,
148 };
149
150 static struct symbol_op const_op = {
151 .type = KW_QUALIFIER,
152 .declarator = const_qualifier,
153 };
154
155 static struct symbol_op volatile_op = {
156 .type = KW_QUALIFIER,
157 .declarator = volatile_qualifier,
158 };
159
160 static struct symbol_op restrict_op = {
161 .type = KW_QUALIFIER,
162 };
163
164 static struct symbol_op typeof_op = {
165 .type = KW_SPECIFIER,
166 .declarator = typeof_specifier,
167 .test = Set_Any,
168 .set = Set_S|Set_T,
169 };
170
171 static struct symbol_op attribute_op = {
172 .type = KW_ATTRIBUTE,
173 .declarator = attribute_specifier,
174 };
175
176 static struct symbol_op struct_op = {
177 .type = KW_SPECIFIER,
178 .declarator = struct_specifier,
179 .test = Set_Any,
180 .set = Set_S|Set_T,
181 };
182
183 static struct symbol_op union_op = {
184 .type = KW_SPECIFIER,
185 .declarator = union_specifier,
186 .test = Set_Any,
187 .set = Set_S|Set_T,
188 };
189
190 static struct symbol_op enum_op = {
191 .type = KW_SPECIFIER,
192 .declarator = enum_specifier,
193 .test = Set_Any,
194 .set = Set_S|Set_T,
195 };
196
197 static struct symbol_op spec_op = {
198 .type = KW_SPECIFIER | KW_EXACT,
199 .test = Set_Any,
200 .set = Set_S|Set_T,
201 };
202
203 static struct symbol_op char_op = {
204 .type = KW_SPECIFIER,
205 .test = Set_T|Set_Long|Set_Short,
206 .set = Set_T|Set_Char,
207 .class = CChar,
208 };
209
210 static struct symbol_op int_op = {
211 .type = KW_SPECIFIER,
212 .test = Set_T,
213 .set = Set_T|Set_Int,
214 };
215
216 static struct symbol_op double_op = {
217 .type = KW_SPECIFIER,
218 .test = Set_T|Set_Signed|Set_Unsigned|Set_Short|Set_Vlong,
219 .set = Set_T|Set_Double,
220 .class = CReal,
221 };
222
223 static struct symbol_op float_op = {
224 .type = KW_SPECIFIER | KW_SHORT,
225 .test = Set_T|Set_Signed|Set_Unsigned|Set_Short|Set_Long,
226 .set = Set_T|Set_Float,
227 .class = CReal,
228 };
229
230 static struct symbol_op short_op = {
231 .type = KW_SPECIFIER | KW_SHORT,
232 .test = Set_S|Set_Char|Set_Float|Set_Double|Set_Long|Set_Short,
233 .set = Set_Short,
234 };
235
236 static struct symbol_op signed_op = {
237 .type = KW_SPECIFIER,
238 .test = Set_S|Set_Float|Set_Double|Set_Signed|Set_Unsigned,
239 .set = Set_Signed,
240 .class = CSInt,
241 };
242
243 static struct symbol_op unsigned_op = {
244 .type = KW_SPECIFIER,
245 .test = Set_S|Set_Float|Set_Double|Set_Signed|Set_Unsigned,
246 .set = Set_Unsigned,
247 .class = CUInt,
248 };
249
250 static struct symbol_op long_op = {
251 .type = KW_SPECIFIER | KW_LONG,
252 .test = Set_S|Set_Char|Set_Float|Set_Short|Set_Vlong,
253 .set = Set_Long,
254 };
255
256 static struct symbol_op if_op = {
257 .statement = parse_if_statement,
258 };
259
260 static struct symbol_op return_op = {
261 .statement = parse_return_statement,
262 };
263
264 static struct symbol_op loop_iter_op = {
265 .statement = parse_loop_iterator,
266 };
267
268 static struct symbol_op default_op = {
269 .statement = parse_default_statement,
270 };
271
272 static struct symbol_op case_op = {
273 .statement = parse_case_statement,
274 };
275
276 static struct symbol_op switch_op = {
277 .statement = parse_switch_statement,
278 };
279
280 static struct symbol_op for_op = {
281 .statement = parse_for_statement,
282 };
283
284 static struct symbol_op while_op = {
285 .statement = parse_while_statement,
286 };
287
288 static struct symbol_op do_op = {
289 .statement = parse_do_statement,
290 };
291
292 static struct symbol_op goto_op = {
293 .statement = parse_goto_statement,
294 };
295
296 static struct symbol_op __context___op = {
297 .statement = parse_context_statement,
298 };
299
300 static struct symbol_op range_op = {
301 .statement = parse_range_statement,
302 };
303
304 static struct symbol_op asm_op = {
305 .type = KW_ASM,
306 .declarator = parse_asm_declarator,
307 .statement = parse_asm_statement,
308 .toplevel = toplevel_asm_declaration,
309 };
310
311 static struct symbol_op packed_op = {
312 .attribute = attribute_packed,
313 };
314
315 static struct symbol_op aligned_op = {
316 .attribute = attribute_aligned,
317 };
318
319 static struct symbol_op attr_mod_op = {
320 .attribute = attribute_modifier,
321 };
322
323 static struct symbol_op attr_force_op = {
324 .attribute = attribute_force,
325 };
326
327 static struct symbol_op address_space_op = {
328 .attribute = attribute_address_space,
329 };
330
331 static struct symbol_op mode_op = {
332 .attribute = attribute_mode,
333 };
334
335 static struct symbol_op context_op = {
336 .attribute = attribute_context,
337 };
338
339 static struct symbol_op designated_init_op = {
340 .attribute = attribute_designated_init,
341 };
342
343 static struct symbol_op transparent_union_op = {
344 .attribute = attribute_transparent_union,
345 };
346
347 static struct symbol_op ignore_attr_op = {
348 .attribute = ignore_attribute,
349 };
350
351 static struct symbol_op mode_QI_op = {
352 .type = KW_MODE,
353 .to_mode = to_QI_mode
354 };
355
356 static struct symbol_op mode_HI_op = {
357 .type = KW_MODE,
358 .to_mode = to_HI_mode
359 };
360
361 static struct symbol_op mode_SI_op = {
362 .type = KW_MODE,
363 .to_mode = to_SI_mode
364 };
365
366 static struct symbol_op mode_DI_op = {
367 .type = KW_MODE,
368 .to_mode = to_DI_mode
369 };
370
371 static struct symbol_op mode_TI_op = {
372 .type = KW_MODE,
373 .to_mode = to_TI_mode
374 };
375
376 static struct symbol_op mode_word_op = {
377 .type = KW_MODE,
378 .to_mode = to_word_mode
379 };
380
381 static struct init_keyword {
382 const char *name;
383 enum namespace ns;
384 unsigned long modifiers;
385 struct symbol_op *op;
386 struct symbol *type;
387 } keyword_table[] = {
388 /* Type qualifiers */
389 { "const", NS_TYPEDEF, .op = &const_op },
390 { "__const", NS_TYPEDEF, .op = &const_op },
391 { "__const__", NS_TYPEDEF, .op = &const_op },
392 { "volatile", NS_TYPEDEF, .op = &volatile_op },
393 { "__volatile", NS_TYPEDEF, .op = &volatile_op },
394 { "__volatile__", NS_TYPEDEF, .op = &volatile_op },
395
396 /* Typedef.. */
397 { "typedef", NS_TYPEDEF, .op = &typedef_op },
398
399 /* Type specifiers */
400 { "void", NS_TYPEDEF, .type = &void_ctype, .op = &spec_op},
401 { "char", NS_TYPEDEF, .op = &char_op },
402 { "short", NS_TYPEDEF, .op = &short_op },
403 { "int", NS_TYPEDEF, .op = &int_op },
404 { "long", NS_TYPEDEF, .op = &long_op },
405 { "float", NS_TYPEDEF, .op = &float_op },
406 { "double", NS_TYPEDEF, .op = &double_op },
407 { "signed", NS_TYPEDEF, .op = &signed_op },
408 { "__signed", NS_TYPEDEF, .op = &signed_op },
409 { "__signed__", NS_TYPEDEF, .op = &signed_op },
410 { "unsigned", NS_TYPEDEF, .op = &unsigned_op },
411 { "_Bool", NS_TYPEDEF, .type = &bool_ctype, .op = &spec_op },
412
413 /* Predeclared types */
414 { "__builtin_va_list", NS_TYPEDEF, .type = &ptr_ctype, .op = &spec_op },
415 { "__builtin_ms_va_list", NS_TYPEDEF, .type = &ptr_ctype, .op = &spec_op },
416 { "__int128_t", NS_TYPEDEF, .type = &lllong_ctype, .op = &spec_op },
417 { "__uint128_t",NS_TYPEDEF, .type = &ulllong_ctype, .op = &spec_op },
418
419 /* Extended types */
420 { "typeof", NS_TYPEDEF, .op = &typeof_op },
421 { "__typeof", NS_TYPEDEF, .op = &typeof_op },
422 { "__typeof__", NS_TYPEDEF, .op = &typeof_op },
423
424 { "__attribute", NS_TYPEDEF, .op = &attribute_op },
425 { "__attribute__", NS_TYPEDEF, .op = &attribute_op },
426
427 { "struct", NS_TYPEDEF, .op = &struct_op },
428 { "union", NS_TYPEDEF, .op = &union_op },
429 { "enum", NS_TYPEDEF, .op = &enum_op },
430
431 { "inline", NS_TYPEDEF, .op = &inline_op },
432 { "__inline", NS_TYPEDEF, .op = &inline_op },
433 { "__inline__", NS_TYPEDEF, .op = &inline_op },
434
435 /* Ignored for now.. */
436 { "restrict", NS_TYPEDEF, .op = &restrict_op},
437 { "__restrict", NS_TYPEDEF, .op = &restrict_op},
438 { "__restrict__", NS_TYPEDEF, .op = &restrict_op},
439
440 /* Storage class */
441 { "auto", NS_TYPEDEF, .op = &auto_op },
442 { "register", NS_TYPEDEF, .op = &register_op },
443 { "static", NS_TYPEDEF, .op = &static_op },
444 { "extern", NS_TYPEDEF, .op = &extern_op },
445 { "__thread", NS_TYPEDEF, .op = &thread_op },
446
447 /* Statement */
448 { "if", NS_KEYWORD, .op = &if_op },
449 { "return", NS_KEYWORD, .op = &return_op },
450 { "break", NS_KEYWORD, .op = &loop_iter_op },
451 { "continue", NS_KEYWORD, .op = &loop_iter_op },
452 { "default", NS_KEYWORD, .op = &default_op },
453 { "case", NS_KEYWORD, .op = &case_op },
454 { "switch", NS_KEYWORD, .op = &switch_op },
455 { "for", NS_KEYWORD, .op = &for_op },
456 { "while", NS_KEYWORD, .op = &while_op },
457 { "do", NS_KEYWORD, .op = &do_op },
458 { "goto", NS_KEYWORD, .op = &goto_op },
459 { "__context__",NS_KEYWORD, .op = &__context___op },
460 { "__range__", NS_KEYWORD, .op = &range_op },
461 { "asm", NS_KEYWORD, .op = &asm_op },
462 { "__asm", NS_KEYWORD, .op = &asm_op },
463 { "__asm__", NS_KEYWORD, .op = &asm_op },
464
465 /* Attribute */
466 { "packed", NS_KEYWORD, .op = &packed_op },
467 { "__packed__", NS_KEYWORD, .op = &packed_op },
468 { "aligned", NS_KEYWORD, .op = &aligned_op },
469 { "__aligned__",NS_KEYWORD, .op = &aligned_op },
470 { "nocast", NS_KEYWORD, MOD_NOCAST, .op = &attr_mod_op },
471 { "noderef", NS_KEYWORD, MOD_NODEREF, .op = &attr_mod_op },
472 { "safe", NS_KEYWORD, MOD_SAFE, .op = &attr_mod_op },
473 { "force", NS_KEYWORD, .op = &attr_force_op },
474 { "bitwise", NS_KEYWORD, MOD_BITWISE, .op = &attr_mod_op },
475 { "__bitwise__",NS_KEYWORD, MOD_BITWISE, .op = &attr_mod_op },
476 { "address_space",NS_KEYWORD, .op = &address_space_op },
477 { "mode", NS_KEYWORD, .op = &mode_op },
478 { "context", NS_KEYWORD, .op = &context_op },
479 { "designated_init", NS_KEYWORD, .op = &designated_init_op },
480 { "__transparent_union__", NS_KEYWORD, .op = &transparent_union_op },
481 { "noreturn", NS_KEYWORD, MOD_NORETURN, .op = &attr_mod_op },
482 { "__noreturn__", NS_KEYWORD, MOD_NORETURN, .op = &attr_mod_op },
483 { "pure", NS_KEYWORD, MOD_PURE, .op = &attr_mod_op },
484 {"__pure__", NS_KEYWORD, MOD_PURE, .op = &attr_mod_op },
485 {"const", NS_KEYWORD, MOD_PURE, .op = &attr_mod_op },
486 {"__const", NS_KEYWORD, MOD_PURE, .op = &attr_mod_op },
487 {"__const__", NS_KEYWORD, MOD_PURE, .op = &attr_mod_op },
488
489 { "__mode__", NS_KEYWORD, .op = &mode_op },
490 { "QI", NS_KEYWORD, MOD_CHAR, .op = &mode_QI_op },
491 { "__QI__", NS_KEYWORD, MOD_CHAR, .op = &mode_QI_op },
492 { "HI", NS_KEYWORD, MOD_SHORT, .op = &mode_HI_op },
493 { "__HI__", NS_KEYWORD, MOD_SHORT, .op = &mode_HI_op },
494 { "SI", NS_KEYWORD, .op = &mode_SI_op },
495 { "__SI__", NS_KEYWORD, .op = &mode_SI_op },
496 { "DI", NS_KEYWORD, MOD_LONGLONG, .op = &mode_DI_op },
497 { "__DI__", NS_KEYWORD, MOD_LONGLONG, .op = &mode_DI_op },
498 { "TI", NS_KEYWORD, MOD_LONGLONGLONG, .op = &mode_TI_op },
499 { "__TI__", NS_KEYWORD, MOD_LONGLONGLONG, .op = &mode_TI_op },
500 { "word", NS_KEYWORD, MOD_LONG, .op = &mode_word_op },
501 { "__word__", NS_KEYWORD, MOD_LONG, .op = &mode_word_op },
502 };
503
504 const char *ignored_attributes[] = {
505 "alias",
506 "__alias__",
507 "alloc_size",
508 "__alloc_size__",
509 "always_inline",
510 "__always_inline__",
511 "artificial",
512 "__artificial__",
513 "bounded",
514 "__bounded__",
515 "cdecl",
516 "__cdecl__",
517 "cold",
518 "__cold__",
519 "constructor",
520 "__constructor__",
521 "deprecated",
522 "__deprecated__",
523 "destructor",
524 "__destructor__",
525 "dllexport",
526 "__dllexport__",
527 "dllimport",
528 "__dllimport__",
529 "error",
530 "__error__",
531 "externally_visible",
532 "__externally_visible__",
533 "fastcall",
534 "__fastcall__",
535 "format",
536 "__format__",
537 "format_arg",
538 "__format_arg__",
539 "hot",
540 "__hot__",
541 "leaf",
542 "__leaf__",
543 "l1_text",
544 "__l1_text__",
545 "l1_data",
546 "__l1_data__",
547 "l2",
548 "__l2__",
549 "may_alias",
550 "__may_alias__",
551 "malloc",
552 "__malloc__",
553 "may_alias",
554 "__may_alias__",
555 "model",
556 "__model__",
557 "ms_abi",
558 "__ms_abi__",
559 "ms_hook_prologue",
560 "__ms_hook_prologue__",
561 "naked",
562 "__naked__",
563 "no_instrument_function",
564 "__no_instrument_function__",
565 "noclone",
566 "__noclone",
567 "__noclone__",
568 "noinline",
569 "__noinline__",
570 "nonnull",
571 "__nonnull",
572 "__nonnull__",
573 "nothrow",
574 "__nothrow",
575 "__nothrow__",
576 "regparm",
577 "__regparm__",
578 "section",
579 "__section__",
580 "sentinel",
581 "__sentinel__",
582 "signal",
583 "__signal__",
584 "stdcall",
585 "__stdcall__",
586 "syscall_linkage",
587 "__syscall_linkage__",
588 "sysv_abi",
589 "__sysv_abi__",
590 "unused",
591 "__unused__",
592 "used",
593 "__used__",
594 "vector_size",
595 "__vector_size__",
596 "visibility",
597 "__visibility__",
598 "warn_unused_result",
599 "__warn_unused_result__",
600 "warning",
601 "__warning__",
602 "weak",
603 "__weak__",
604 };
605
606
607 void init_parser(int stream)
608 {
609 int i;
610 for (i = 0; i < ARRAY_SIZE(keyword_table); i++) {
611 struct init_keyword *ptr = keyword_table + i;
612 struct symbol *sym = create_symbol(stream, ptr->name, SYM_KEYWORD, ptr->ns);
613 sym->ident->keyword = 1;
614 if (ptr->ns == NS_TYPEDEF)
615 sym->ident->reserved = 1;
616 sym->ctype.modifiers = ptr->modifiers;
617 sym->ctype.base_type = ptr->type;
618 sym->op = ptr->op;
619 }
620
621 for (i = 0; i < ARRAY_SIZE(ignored_attributes); i++) {
622 const char * name = ignored_attributes[i];
623 struct symbol *sym = create_symbol(stream, name, SYM_KEYWORD,
624 NS_KEYWORD);
625 sym->ident->keyword = 1;
626 sym->op = &ignore_attr_op;
627 }
628 }
629
630
631 // Add a symbol to the list of function-local symbols
632 static void fn_local_symbol(struct symbol *sym)
633 {
634 if (function_symbol_list)
635 add_symbol(function_symbol_list, sym);
636 }
637
638 static int SENTINEL_ATTR match_idents(struct token *token, ...)
639 {
640 va_list args;
641 struct ident * next;
642
643 if (token_type(token) != TOKEN_IDENT)
644 return 0;
645
646 va_start(args, token);
647 do {
648 next = va_arg(args, struct ident *);
649 } while (next && token->ident != next);
650 va_end(args);
651
652 return next && token->ident == next;
653 }
654
655
656 struct statement *alloc_statement(struct position pos, int type)
657 {
658 struct statement *stmt = __alloc_statement(0);
659 stmt->type = type;
660 stmt->pos = pos;
661 return stmt;
662 }
663
664 static struct token *struct_declaration_list(struct token *token, struct symbol_list **list);
665
666 static void apply_modifiers(struct position pos, struct decl_state *ctx)
667 {
668 struct symbol *ctype;
669 if (!ctx->mode)
670 return;
671 ctype = ctx->mode->to_mode(ctx->ctype.base_type);
672 if (!ctype)
673 sparse_error(pos, "don't know how to apply mode to %s",
674 show_typename(ctx->ctype.base_type));
675 else
676 ctx->ctype.base_type = ctype;
677
678 }
679
680 static struct symbol * alloc_indirect_symbol(struct position pos, struct ctype *ctype, int type)
681 {
682 struct symbol *sym = alloc_symbol(pos, type);
683
684 sym->ctype.base_type = ctype->base_type;
685 sym->ctype.modifiers = ctype->modifiers;
686
687 ctype->base_type = sym;
688 ctype->modifiers = 0;
689 return sym;
690 }
691
692 /*
693 * NOTE! NS_LABEL is not just a different namespace,
694 * it also ends up using function scope instead of the
695 * regular symbol scope.
696 */
697 struct symbol *label_symbol(struct token *token)
698 {
699 struct symbol *sym = lookup_symbol(token->ident, NS_LABEL);
700 if (!sym) {
701 sym = alloc_symbol(token->pos, SYM_LABEL);
702 bind_symbol(sym, token->ident, NS_LABEL);
703 fn_local_symbol(sym);
704 }
705 return sym;
706 }
707
708 static struct token *struct_union_enum_specifier(enum type type,
709 struct token *token, struct decl_state *ctx,
710 struct token *(*parse)(struct token *, struct symbol *))
711 {
712 struct symbol *sym;
713 struct position *repos;
714
715 token = handle_attributes(token, ctx, KW_ATTRIBUTE);
716 if (token_type(token) == TOKEN_IDENT) {
717 sym = lookup_symbol(token->ident, NS_STRUCT);
718 if (!sym ||
719 (is_outer_scope(sym->scope) &&
720 (match_op(token->next,';') || match_op(token->next,'{')))) {
721 // Either a new symbol, or else an out-of-scope
722 // symbol being redefined.
723 sym = alloc_symbol(token->pos, type);
724 bind_symbol(sym, token->ident, NS_STRUCT);
725 }
726 if (sym->type != type)
727 error_die(token->pos, "invalid tag applied to %s", show_typename (sym));
728 ctx->ctype.base_type = sym;
729 repos = &token->pos;
730 token = token->next;
731 if (match_op(token, '{')) {
732 // The following test is actually wrong for empty
733 // structs, but (1) they are not C99, (2) gcc does
734 // the same thing, and (3) it's easier.
735 if (sym->symbol_list)
736 error_die(token->pos, "redefinition of %s", show_typename (sym));
737 sym->pos = *repos;
738 token = parse(token->next, sym);
739 token = expect(token, '}', "at end of struct-union-enum-specifier");
740
741 // Mark the structure as needing re-examination
742 sym->examined = 0;
743 sym->endpos = token->pos;
744 }
745 return token;
746 }
747
748 // private struct/union/enum type
749 if (!match_op(token, '{')) {
750 sparse_error(token->pos, "expected declaration");
751 ctx->ctype.base_type = &bad_ctype;
752 return token;
753 }
754
755 sym = alloc_symbol(token->pos, type);
756 token = parse(token->next, sym);
757 ctx->ctype.base_type = sym;
758 token = expect(token, '}', "at end of specifier");
759 sym->endpos = token->pos;
760
761 return token;
762 }
763
764 static struct token *parse_struct_declaration(struct token *token, struct symbol *sym)
765 {
766 struct symbol *field, *last = NULL;
767 struct token *res;
768 res = struct_declaration_list(token, &sym->symbol_list);
769 FOR_EACH_PTR(sym->symbol_list, field) {
770 if (!field->ident) {
771 struct symbol *base = field->ctype.base_type;
772 if (base && base->type == SYM_BITFIELD)
773 continue;
774 }
775 if (last)
776 last->next_subobject = field;
777 last = field;
778 } END_FOR_EACH_PTR(field);
779 return res;
780 }
781
782 static struct token *parse_union_declaration(struct token *token, struct symbol *sym)
783 {
784 return struct_declaration_list(token, &sym->symbol_list);
785 }
786
787 static struct token *struct_specifier(struct token *token, struct decl_state *ctx)
788 {
789 return struct_union_enum_specifier(SYM_STRUCT, token, ctx, parse_struct_declaration);
790 }
791
792 static struct token *union_specifier(struct token *token, struct decl_state *ctx)
793 {
794 return struct_union_enum_specifier(SYM_UNION, token, ctx, parse_union_declaration);
795 }
796
797
798 typedef struct {
799 int x;
800 unsigned long long y;
801 } Num;
802
803 static void upper_boundary(Num *n, Num *v)
804 {
805 if (n->x > v->x)
806 return;
807 if (n->x < v->x) {
808 *n = *v;
809 return;
810 }
811 if (n->y < v->y)
812 n->y = v->y;
813 }
814
815 static void lower_boundary(Num *n, Num *v)
816 {
817 if (n->x < v->x)
818 return;
819 if (n->x > v->x) {
820 *n = *v;
821 return;
822 }
823 if (n->y > v->y)
824 n->y = v->y;
825 }
826
827 static int type_is_ok(struct symbol *type, Num *upper, Num *lower)
828 {
829 int shift = type->bit_size;
830 int is_unsigned = type->ctype.modifiers & MOD_UNSIGNED;
831
832 if (!is_unsigned)
833 shift--;
834 if (upper->x == 0 && upper->y >> shift)
835 return 0;
836 if (lower->x == 0 || (!is_unsigned && (~lower->y >> shift) == 0))
837 return 1;
838 return 0;
839 }
840
841 static struct symbol *bigger_enum_type(struct symbol *s1, struct symbol *s2)
842 {
843 if (s1->bit_size < s2->bit_size) {
844 s1 = s2;
845 } else if (s1->bit_size == s2->bit_size) {
846 if (s2->ctype.modifiers & MOD_UNSIGNED)
847 s1 = s2;
848 }
849 if (s1->bit_size < bits_in_int)
850 return &int_ctype;
851 return s1;
852 }
853
854 static void cast_enum_list(struct symbol_list *list, struct symbol *base_type)
855 {
856 struct symbol *sym;
857
858 FOR_EACH_PTR(list, sym) {
859 struct expression *expr = sym->initializer;
860 struct symbol *ctype;
861 if (expr->type != EXPR_VALUE)
862 continue;
863 ctype = expr->ctype;
864 if (ctype->bit_size == base_type->bit_size)
865 continue;
866 cast_value(expr, base_type, expr, ctype);
867 } END_FOR_EACH_PTR(sym);
868 }
869
870 static struct token *parse_enum_declaration(struct token *token, struct symbol *parent)
871 {
872 unsigned long long lastval = 0;
873 struct symbol *ctype = NULL, *base_type = NULL;
874 Num upper = {-1, 0}, lower = {1, 0};
875
876 parent->examined = 1;
877 parent->ctype.base_type = &int_ctype;
878 while (token_type(token) == TOKEN_IDENT) {
879 struct expression *expr = NULL;
880 struct token *next = token->next;
881 struct symbol *sym;
882
883 if (match_op(next, '=')) {
884 next = constant_expression(next->next, &expr);
885 lastval = get_expression_value(expr);
886 ctype = &void_ctype;
887 if (expr && expr->ctype)
888 ctype = expr->ctype;
889 } else if (!ctype) {
890 ctype = &int_ctype;
891 } else if (is_int_type(ctype)) {
892 lastval++;
893 } else {
894 error_die(token->pos, "can't increment the last enum member");
895 }
896
897 if (!expr) {
898 expr = alloc_expression(token->pos, EXPR_VALUE);
899 expr->value = lastval;
900 expr->ctype = ctype;
901 }
902
903 sym = alloc_symbol(token->pos, SYM_NODE);
904 bind_symbol(sym, token->ident, NS_SYMBOL);
905 sym->ctype.modifiers &= ~MOD_ADDRESSABLE;
906 sym->initializer = expr;
907 sym->enum_member = 1;
908 sym->ctype.base_type = parent;
909 add_ptr_list(&parent->symbol_list, sym);
910
911 if (base_type != &bad_ctype) {
912 if (ctype->type == SYM_NODE)
913 ctype = ctype->ctype.base_type;
914 if (ctype->type == SYM_ENUM) {
915 if (ctype == parent)
916 ctype = base_type;
917 else
918 ctype = ctype->ctype.base_type;
919 }
920 /*
921 * base_type rules:
922 * - if all enums are of the same type, then
923 * the base_type is that type (two first
924 * cases)
925 * - if enums are of different types, they
926 * all have to be integer types, and the
927 * base type is at least "int_ctype".
928 * - otherwise the base_type is "bad_ctype".
929 */
930 if (!base_type) {
931 base_type = ctype;
932 } else if (ctype == base_type) {
933 /* nothing */
934 } else if (is_int_type(base_type) && is_int_type(ctype)) {
935 base_type = bigger_enum_type(base_type, ctype);
936 } else
937 base_type = &bad_ctype;
938 parent->ctype.base_type = base_type;
939 }
940 if (is_int_type(base_type)) {
941 Num v = {.y = lastval};
942 if (ctype->ctype.modifiers & MOD_UNSIGNED)
943 v.x = 0;
944 else if ((long long)lastval >= 0)
945 v.x = 0;
946 else
947 v.x = -1;
948 upper_boundary(&upper, &v);
949 lower_boundary(&lower, &v);
950 }
951 token = next;
952
953 sym->endpos = token->pos;
954
955 if (!match_op(token, ','))
956 break;
957 token = token->next;
958 }
959 if (!base_type) {
960 sparse_error(token->pos, "bad enum definition");
961 base_type = &bad_ctype;
962 }
963 else if (!is_int_type(base_type))
964 base_type = base_type;
965 else if (type_is_ok(base_type, &upper, &lower))
966 base_type = base_type;
967 else if (type_is_ok(&int_ctype, &upper, &lower))
968 base_type = &int_ctype;
969 else if (type_is_ok(&uint_ctype, &upper, &lower))
970 base_type = &uint_ctype;
971 else if (type_is_ok(&long_ctype, &upper, &lower))
972 base_type = &long_ctype;
973 else if (type_is_ok(&ulong_ctype, &upper, &lower))
974 base_type = &ulong_ctype;
975 else if (type_is_ok(&llong_ctype, &upper, &lower))
976 base_type = &llong_ctype;
977 else if (type_is_ok(&ullong_ctype, &upper, &lower))
978 base_type = &ullong_ctype;
979 else
980 base_type = &bad_ctype;
981 parent->ctype.base_type = base_type;
982 parent->ctype.modifiers |= (base_type->ctype.modifiers & MOD_UNSIGNED);
983 parent->examined = 0;
984
985 cast_enum_list(parent->symbol_list, base_type);
986
987 return token;
988 }
989
990 static struct token *enum_specifier(struct token *token, struct decl_state *ctx)
991 {
992 struct token *ret = struct_union_enum_specifier(SYM_ENUM, token, ctx, parse_enum_declaration);
993 struct ctype *ctype = &ctx->ctype.base_type->ctype;
994
995 if (!ctype->base_type)
996 ctype->base_type = &incomplete_ctype;
997
998 return ret;
999 }
1000
1001 static void apply_ctype(struct position pos, struct ctype *thistype, struct ctype *ctype);
1002
1003 static struct token *typeof_specifier(struct token *token, struct decl_state *ctx)
1004 {
1005 struct symbol *sym;
1006
1007 if (!match_op(token, '(')) {
1008 sparse_error(token->pos, "expected '(' after typeof");
1009 return token;
1010 }
1011 if (lookup_type(token->next)) {
1012 token = typename(token->next, &sym, NULL);
1013 ctx->ctype.base_type = sym->ctype.base_type;
1014 apply_ctype(token->pos, &sym->ctype, &ctx->ctype);
1015 } else {
1016 struct symbol *typeof_sym = alloc_symbol(token->pos, SYM_TYPEOF);
1017 token = parse_expression(token->next, &typeof_sym->initializer);
1018
1019 typeof_sym->endpos = token->pos;
1020 if (!typeof_sym->initializer) {
1021 sparse_error(token->pos, "expected expression after the '(' token");
1022 typeof_sym = &bad_ctype;
1023 }
1024 ctx->ctype.base_type = typeof_sym;
1025 }
1026 return expect(token, ')', "after typeof");
1027 }
1028
1029 static struct token *ignore_attribute(struct token *token, struct symbol *attr, struct decl_state *ctx)
1030 {
1031 struct expression *expr = NULL;
1032 if (match_op(token, '('))
1033 token = parens_expression(token, &expr, "in attribute");
1034 return token;
1035 }
1036
1037 static struct token *attribute_packed(struct token *token, struct symbol *attr, struct decl_state *ctx)
1038 {
1039 set_attr_is_packed(&ctx->ctype);
1040 if (!ctx->ctype.alignment)
1041 ctx->ctype.alignment = 1;
1042 return token;
1043 }
1044
1045 static struct token *attribute_aligned(struct token *token, struct symbol *attr, struct decl_state *ctx)
1046 {
1047 int alignment = max_alignment;
1048 struct expression *expr = NULL;
1049
1050 if (match_op(token, '(')) {
1051 token = parens_expression(token, &expr, "in attribute");
1052 if (expr)
1053 alignment = const_expression_value(expr);
1054 }
1055 if (alignment & (alignment-1)) {
1056 warning(token->pos, "I don't like non-power-of-2 alignments");
1057 return token;
1058 } else if (alignment > ctx->ctype.alignment)
1059 ctx->ctype.alignment = alignment;
1060 return token;
1061 }
1062
1063 static void apply_qualifier(struct position *pos, struct ctype *ctx, unsigned long qual)
1064 {
1065 if (ctx->modifiers & qual)
1066 warning(*pos, "duplicate %s", modifier_string(qual));
1067 ctx->modifiers |= qual;
1068 }
1069
1070 static struct token *attribute_modifier(struct token *token, struct symbol *attr, struct decl_state *ctx)
1071 {
1072 apply_qualifier(&token->pos, &ctx->ctype, attr->ctype.modifiers);
1073 return token;
1074 }
1075
1076 static struct token *attribute_address_space(struct token *token, struct symbol *attr, struct decl_state *ctx)
1077 {
1078 struct expression *expr = NULL;
1079 int as;
1080 token = expect(token, '(', "after address_space attribute");
1081 token = conditional_expression(token, &expr);
1082 if (expr) {
1083 as = const_expression_value(expr);
1084 if (Waddress_space && as)
1085 attr_set_as(&ctx->ctype, as);
1086 }
1087 token = expect(token, ')', "after address_space attribute");
1088 return token;
1089 }
1090
1091 static struct symbol *to_QI_mode(struct symbol *ctype)
1092 {
1093 if (ctype->ctype.base_type != &int_type)
1094 return NULL;
1095 if (ctype == &char_ctype)
1096 return ctype;
1097 return ctype->ctype.modifiers & MOD_UNSIGNED ? &uchar_ctype
1098 : &schar_ctype;
1099 }
1100
1101 static struct symbol *to_HI_mode(struct symbol *ctype)
1102 {
1103 if (ctype->ctype.base_type != &int_type)
1104 return NULL;
1105 return ctype->ctype.modifiers & MOD_UNSIGNED ? &ushort_ctype
1106 : &sshort_ctype;
1107 }
1108
1109 static struct symbol *to_SI_mode(struct symbol *ctype)
1110 {
1111 if (ctype->ctype.base_type != &int_type)
1112 return NULL;
1113 return ctype->ctype.modifiers & MOD_UNSIGNED ? &uint_ctype
1114 : &sint_ctype;
1115 }
1116
1117 static struct symbol *to_DI_mode(struct symbol *ctype)
1118 {
1119 if (ctype->ctype.base_type != &int_type)
1120 return NULL;
1121 return ctype->ctype.modifiers & MOD_UNSIGNED ? &ullong_ctype
1122 : &sllong_ctype;
1123 }
1124
1125 static struct symbol *to_TI_mode(struct symbol *ctype)
1126 {
1127 if (ctype->ctype.base_type != &int_type)
1128 return NULL;
1129 return ctype->ctype.modifiers & MOD_UNSIGNED ? &ulllong_ctype
1130 : &slllong_ctype;
1131 }
1132
1133 static struct symbol *to_word_mode(struct symbol *ctype)
1134 {
1135 if (ctype->ctype.base_type != &int_type)
1136 return NULL;
1137 return ctype->ctype.modifiers & MOD_UNSIGNED ? &ulong_ctype
1138 : &slong_ctype;
1139 }
1140
1141 static struct token *attribute_mode(struct token *token, struct symbol *attr, struct decl_state *ctx)
1142 {
1143 token = expect(token, '(', "after mode attribute");
1144 if (token_type(token) == TOKEN_IDENT) {
1145 struct symbol *mode = lookup_keyword(token->ident, NS_KEYWORD);
1146 if (mode && mode->op->type == KW_MODE)
1147 ctx->mode = mode->op;
1148 else
1149 sparse_error(token->pos, "unknown mode attribute %s\n", show_ident(token->ident));
1150 token = token->next;
1151 } else
1152 sparse_error(token->pos, "expect attribute mode symbol\n");
1153 token = expect(token, ')', "after mode attribute");
1154 return token;
1155 }
1156
1157 static struct token *attribute_context(struct token *token, struct symbol *attr, struct decl_state *ctx)
1158 {
1159 struct context *context = alloc_context();
1160 struct expression *args[3];
1161 int argc = 0;
1162
1163 token = expect(token, '(', "after context attribute");
1164 while (!match_op(token, ')')) {
1165 struct expression *expr = NULL;
1166 token = conditional_expression(token, &expr);
1167 if (!expr)
1168 break;
1169 if (argc < 3)
1170 args[argc++] = expr;
1171 if (!match_op(token, ','))
1172 break;
1173 token = token->next;
1174 }
1175
1176 switch(argc) {
1177 case 0:
1178 sparse_error(token->pos, "expected context input/output values");
1179 break;
1180 case 1:
1181 context->in = get_expression_value(args[0]);
1182 break;
1183 case 2:
1184 context->in = get_expression_value(args[0]);
1185 context->out = get_expression_value(args[1]);
1186 break;
1187 case 3:
1188 context->context = args[0];
1189 context->in = get_expression_value(args[1]);
1190 context->out = get_expression_value(args[2]);
1191 break;
1192 }
1193
1194 if (argc)
1195 attr_add_context(&ctx->ctype, context);
1196
1197 token = expect(token, ')', "after context attribute");
1198 return token;
1199 }
1200
1201 static struct token *attribute_designated_init(struct token *token, struct symbol *attr, struct decl_state *ctx)
1202 {
1203 if (ctx->ctype.base_type && ctx->ctype.base_type->type == SYM_STRUCT)
1204 ctx->ctype.base_type->designated_init = 1;
1205 else
1206 warning(token->pos, "attribute designated_init applied to non-structure type");
1207 return token;
1208 }
1209
1210 static struct token *attribute_transparent_union(struct token *token, struct symbol *attr, struct decl_state *ctx)
1211 {
1212 if (Wtransparent_union)
1213 warning(token->pos, "attribute __transparent_union__");
1214
1215 if (ctx->ctype.base_type && ctx->ctype.base_type->type == SYM_UNION)
1216 ctx->ctype.base_type->transparent_union = 1;
1217 else
1218 warning(token->pos, "attribute __transparent_union__ applied to non-union type");
1219 return token;
1220 }
1221
1222 static struct token *recover_unknown_attribute(struct token *token)
1223 {
1224 struct expression *expr = NULL;
1225
1226 if (Wunknown_attribute)
1227 sparse_error(token->pos, "attribute '%s': unknown attribute", show_ident(token->ident));
1228 token = token->next;
1229 if (match_op(token, '('))
1230 token = parens_expression(token, &expr, "in attribute");
1231 return token;
1232 }
1233
1234 static struct token *attribute_specifier(struct token *token, struct decl_state *ctx)
1235 {
1236 token = expect(token, '(', "after attribute");
1237 token = expect(token, '(', "after attribute");
1238
1239 for (;;) {
1240 struct ident *attribute_name;
1241 struct symbol *attr;
1242
1243 if (eof_token(token))
1244 break;
1245 if (match_op(token, ';'))
1246 break;
1247 if (token_type(token) != TOKEN_IDENT)
1248 break;
1249 attribute_name = token->ident;
1250 attr = lookup_keyword(attribute_name, NS_KEYWORD);
1251 if (attr && attr->op->attribute)
1252 token = attr->op->attribute(token->next, attr, ctx);
1253 else
1254 token = recover_unknown_attribute(token);
1255
1256 if (!match_op(token, ','))
1257 break;
1258 token = token->next;
1259 }
1260
1261 token = expect(token, ')', "after attribute");
1262 token = expect(token, ')', "after attribute");
1263
1264 if (ctx->ctype.attribute->is_packed && ctx->ctype.base_type)
1265 set_attr_is_packed(&ctx->ctype.base_type->ctype);
1266
1267 return token;
1268 }
1269
1270 static const char *storage_class[] =
1271 {
1272 [STypedef] = "typedef",
1273 [SAuto] = "auto",
1274 [SExtern] = "extern",
1275 [SStatic] = "static",
1276 [SRegister] = "register",
1277 [SForced] = "[force]"
1278 };
1279
1280 static unsigned long storage_modifiers(struct decl_state *ctx)
1281 {
1282 static unsigned long mod[] =
1283 {
1284 [SAuto] = MOD_AUTO,
1285 [SExtern] = MOD_EXTERN,
1286 [SStatic] = MOD_STATIC,
1287 [SRegister] = MOD_REGISTER
1288 };
1289 return mod[ctx->storage_class] | (ctx->is_inline ? MOD_INLINE : 0)
1290 | (ctx->is_tls ? MOD_TLS : 0);
1291 }
1292
1293 static void set_storage_class(struct position *pos, struct decl_state *ctx, int class)
1294 {
1295 /* __thread can be used alone, or with extern or static */
1296 if (ctx->is_tls && (class != SStatic && class != SExtern)) {
1297 sparse_error(*pos, "__thread can only be used alone, or with "
1298 "extern or static");
1299 return;
1300 }
1301
1302 if (!ctx->storage_class) {
1303 ctx->storage_class = class;
1304 return;
1305 }
1306 if (ctx->storage_class == class)
1307 sparse_error(*pos, "duplicate %s", storage_class[class]);
1308 else
1309 sparse_error(*pos, "multiple storage classes");
1310 }
1311
1312 static struct token *typedef_specifier(struct token *next, struct decl_state *ctx)
1313 {
1314 set_storage_class(&next->pos, ctx, STypedef);
1315 return next;
1316 }
1317
1318 static struct token *auto_specifier(struct token *next, struct decl_state *ctx)
1319 {
1320 set_storage_class(&next->pos, ctx, SAuto);
1321 return next;
1322 }
1323
1324 static struct token *register_specifier(struct token *next, struct decl_state *ctx)
1325 {
1326 set_storage_class(&next->pos, ctx, SRegister);
1327 return next;
1328 }
1329
1330 static struct token *static_specifier(struct token *next, struct decl_state *ctx)
1331 {
1332 set_storage_class(&next->pos, ctx, SStatic);
1333 return next;
1334 }
1335
1336 static struct token *extern_specifier(struct token *next, struct decl_state *ctx)
1337 {
1338 set_storage_class(&next->pos, ctx, SExtern);
1339 return next;
1340 }
1341
1342 static struct token *thread_specifier(struct token *next, struct decl_state *ctx)
1343 {
1344 /* This GCC extension can be used alone, or with extern or static */
1345 if (!ctx->storage_class || ctx->storage_class == SStatic
1346 || ctx->storage_class == SExtern) {
1347 ctx->is_tls = 1;
1348 } else {
1349 sparse_error(next->pos, "__thread can only be used alone, or "
1350 "with extern or static");
1351 }
1352
1353 return next;
1354 }
1355
1356 static struct token *attribute_force(struct token *token, struct symbol *attr, struct decl_state *ctx)
1357 {
1358 set_storage_class(&token->pos, ctx, SForced);
1359 return token;
1360 }
1361
1362 static struct token *inline_specifier(struct token *next, struct decl_state *ctx)
1363 {
1364 ctx->is_inline = 1;
1365 return next;
1366 }
1367
1368 static struct token *const_qualifier(struct token *next, struct decl_state *ctx)
1369 {
1370 apply_qualifier(&next->pos, &ctx->ctype, MOD_CONST);
1371 return next;
1372 }
1373
1374 static struct token *volatile_qualifier(struct token *next, struct decl_state *ctx)
1375 {
1376 apply_qualifier(&next->pos, &ctx->ctype, MOD_VOLATILE);
1377 return next;
1378 }
1379
1380 static void apply_ctype(struct position pos, struct ctype *thistype, struct ctype *ctype)
1381 {
1382 unsigned long mod = thistype->modifiers;
1383
1384 if (mod)
1385 apply_qualifier(&pos, ctype, mod);
1386
1387 /* Alignment */
1388 if (thistype->alignment > ctype->alignment)
1389 ctype->alignment = thistype->alignment;
1390
1391 /* Attribute */
1392 merge_attr(ctype, thistype);
1393 }
1394
1395 static void specifier_conflict(struct position pos, int what, struct ident *new)
1396 {
1397 const char *old;
1398 if (what & (Set_S | Set_T))
1399 goto Catch_all;
1400 if (what & Set_Char)
1401 old = "char";
1402 else if (what & Set_Double)
1403 old = "double";
1404 else if (what & Set_Float)
1405 old = "float";
1406 else if (what & Set_Signed)
1407 old = "signed";
1408 else if (what & Set_Unsigned)
1409 old = "unsigned";
1410 else if (what & Set_Short)
1411 old = "short";
1412 else if (what & Set_Long)
1413 old = "long";
1414 else
1415 old = "long long";
1416 sparse_error(pos, "impossible combination of type specifiers: %s %s",
1417 old, show_ident(new));
1418 return;
1419
1420 Catch_all:
1421 sparse_error(pos, "two or more data types in declaration specifiers");
1422 }
1423
1424 static struct symbol * const int_types[] =
1425 {&short_ctype, &int_ctype, &long_ctype, &llong_ctype};
1426 static struct symbol * const signed_types[] =
1427 {&sshort_ctype, &sint_ctype, &slong_ctype, &sllong_ctype,
1428 &slllong_ctype};
1429 static struct symbol * const unsigned_types[] =
1430 {&ushort_ctype, &uint_ctype, &ulong_ctype, &ullong_ctype,
1431 &ulllong_ctype};
1432 static struct symbol * const real_types[] =
1433 {&float_ctype, &double_ctype, &ldouble_ctype};
1434 static struct symbol * const char_types[] =
1435 {&char_ctype, &schar_ctype, &uchar_ctype};
1436 static struct symbol * const * const types[] = {
1437 int_types + 1, signed_types + 1, unsigned_types + 1,
1438 real_types + 1, char_types, char_types + 1, char_types + 2
1439 };
1440
1441 struct symbol *ctype_integer(int size, int want_unsigned)
1442 {
1443 return types[want_unsigned ? CUInt : CInt][size];
1444 }
1445
1446 static struct token *handle_qualifiers(struct token *t, struct decl_state *ctx)
1447 {
1448 while (token_type(t) == TOKEN_IDENT) {
1449 struct symbol *s = lookup_symbol(t->ident, NS_TYPEDEF);
1450 if (!s)
1451 break;
1452 if (s->type != SYM_KEYWORD)
1453 break;
1454 if (!(s->op->type & (KW_ATTRIBUTE | KW_QUALIFIER)))
1455 break;
1456 t = t->next;
1457 if (s->op->declarator)
1458 t = s->op->declarator(t, ctx);
1459 }
1460 return t;
1461 }
1462
1463 static struct token *declaration_specifiers(struct token *token, struct decl_state *ctx)
1464 {
1465 int seen = 0;
1466 int class = CInt;
1467 int size = 0;
1468
1469 while (token_type(token) == TOKEN_IDENT) {
1470 struct symbol *s = lookup_symbol(token->ident,
1471 NS_TYPEDEF | NS_SYMBOL);
1472 if (!s || !(s->namespace & NS_TYPEDEF))
1473 break;
1474 if (s->type != SYM_KEYWORD) {
1475 if (seen & Set_Any)
1476 break;
1477 seen |= Set_S | Set_T;
1478 ctx->ctype.base_type = s->ctype.base_type;
1479 apply_ctype(token->pos, &s->ctype, &ctx->ctype);
1480 token = token->next;
1481 continue;
1482 }
1483 if (s->op->type & KW_SPECIFIER) {
1484 if (seen & s->op->test) {
1485 specifier_conflict(token->pos,
1486 seen & s->op->test,
1487 token->ident);
1488 break;
1489 }
1490 seen |= s->op->set;
1491 class += s->op->class;
1492 if (s->op->type & KW_SHORT) {
1493 size = -1;
1494 } else if (s->op->type & KW_LONG && size++) {
1495 if (class == CReal) {
1496 specifier_conflict(token->pos,
1497 Set_Vlong,
1498 &double_ident);
1499 break;
1500 }
1501 seen |= Set_Vlong;
1502 }
1503 }
1504 token = token->next;
1505 if (s->op->declarator)
1506 token = s->op->declarator(token, ctx);
1507 if (s->op->type & KW_EXACT) {
1508 ctx->ctype.base_type = s->ctype.base_type;
1509 ctx->ctype.modifiers |= s->ctype.modifiers;
1510 }
1511 }
1512
1513 if (!(seen & Set_S)) { /* not set explicitly? */
1514 struct symbol *base = &incomplete_ctype;
1515 if (seen & Set_Any)
1516 base = types[class][size];
1517 ctx->ctype.base_type = base;
1518 }
1519
1520 if (ctx->ctype.modifiers & MOD_BITWISE) {
1521 struct symbol *type;
1522 ctx->ctype.modifiers &= ~MOD_BITWISE;
1523 if (!is_int_type(ctx->ctype.base_type)) {
1524 sparse_error(token->pos, "invalid modifier");
1525 return token;
1526 }
1527 type = alloc_symbol(token->pos, SYM_BASETYPE);
1528 *type = *ctx->ctype.base_type;
1529 type->ctype.modifiers &= ~MOD_SPECIFIER;
1530 type->ctype.base_type = ctx->ctype.base_type;
1531 type->type = SYM_RESTRICT;
1532 ctx->ctype.base_type = type;
1533 create_fouled(type);
1534 }
1535 return token;
1536 }
1537
1538 static struct token *abstract_array_static_declarator(struct token *token, int *has_static)
1539 {
1540 while (token->ident == &static_ident) {
1541 if (*has_static)
1542 sparse_error(token->pos, "duplicate array static declarator");
1543
1544 *has_static = 1;
1545 token = token->next;
1546 }
1547 return token;
1548
1549 }
1550
1551 static struct token *abstract_array_declarator(struct token *token, struct symbol *sym)
1552 {
1553 struct expression *expr = NULL;
1554 int has_static = 0;
1555
1556 token = abstract_array_static_declarator(token, &has_static);
1557
1558 if (match_idents(token, &restrict_ident, &__restrict_ident, NULL))
1559 token = abstract_array_static_declarator(token->next, &has_static);
1560 token = parse_expression(token, &expr);
1561 sym->array_size = expr;
1562 return token;
1563 }
1564
1565 static struct token *parameter_type_list(struct token *, struct symbol *);
1566 static struct token *identifier_list(struct token *, struct symbol *);
1567 static struct token *declarator(struct token *token, struct decl_state *ctx);
1568
1569 static struct token *skip_attribute(struct token *token)
1570 {
1571 token = token->next;
1572 if (match_op(token, '(')) {
1573 int depth = 1;
1574 token = token->next;
1575 while (depth && !eof_token(token)) {
1576 if (token_type(token) == TOKEN_SPECIAL) {
1577 if (token->special == '(')
1578 depth++;
1579 else if (token->special == ')')
1580 depth--;
1581 }
1582 token = token->next;
1583 }
1584 }
1585 return token;
1586 }
1587
1588 static struct token *skip_attributes(struct token *token)
1589 {
1590 struct symbol *keyword;
1591 for (;;) {
1592 if (token_type(token) != TOKEN_IDENT)
1593 break;
1594 keyword = lookup_keyword(token->ident, NS_KEYWORD | NS_TYPEDEF);
1595 if (!keyword || keyword->type != SYM_KEYWORD)
1596 break;
1597 if (!(keyword->op->type & KW_ATTRIBUTE))
1598 break;
1599 token = expect(token->next, '(', "after attribute");
1600 token = expect(token, '(', "after attribute");
1601 for (;;) {
1602 if (eof_token(token))
1603 break;
1604 if (match_op(token, ';'))
1605 break;
1606 if (token_type(token) != TOKEN_IDENT)
1607 break;
1608 token = skip_attribute(token);
1609 if (!match_op(token, ','))
1610 break;
1611 token = token->next;
1612 }
1613 token = expect(token, ')', "after attribute");
1614 token = expect(token, ')', "after attribute");
1615 }
1616 return token;
1617 }
1618
1619 static struct token *handle_attributes(struct token *token, struct decl_state *ctx, unsigned int keywords)
1620 {
1621 struct symbol *keyword;
1622 for (;;) {
1623 if (token_type(token) != TOKEN_IDENT)
1624 break;
1625 keyword = lookup_keyword(token->ident, NS_KEYWORD | NS_TYPEDEF);
1626 if (!keyword || keyword->type != SYM_KEYWORD)
1627 break;
1628 if (!(keyword->op->type & keywords))
1629 break;
1630 token = keyword->op->declarator(token->next, ctx);
1631 keywords &= KW_ATTRIBUTE;
1632 }
1633 return token;
1634 }
1635
1636 static int is_nested(struct token *token, struct token **p,
1637 int prefer_abstract)
1638 {
1639 /*
1640 * This can be either a parameter list or a grouping.
1641 * For the direct (non-abstract) case, we know if must be
1642 * a parameter list if we already saw the identifier.
1643 * For the abstract case, we know if must be a parameter
1644 * list if it is empty or starts with a type.
1645 */
1646 struct token *next = token->next;
1647
1648 *p = next = skip_attributes(next);
1649
1650 if (token_type(next) == TOKEN_IDENT) {
1651 if (lookup_type(next))
1652 return !prefer_abstract;
1653 return 1;
1654 }
1655
1656 if (match_op(next, ')') || match_op(next, SPECIAL_ELLIPSIS))
1657 return 0;
1658
1659 return 1;
1660 }
1661
1662 enum kind {
1663 Empty, K_R, Proto, Bad_Func,
1664 };
1665
1666 static enum kind which_func(struct token *token,
1667 struct ident **n,
1668 int prefer_abstract)
1669 {
1670 struct token *next = token->next;
1671
1672 if (token_type(next) == TOKEN_IDENT) {
1673 if (lookup_type(next))
1674 return Proto;
1675 /* identifier list not in definition; complain */
1676 if (prefer_abstract)
1677 warning(token->pos,
1678 "identifier list not in definition");
1679 return K_R;
1680 }
1681
1682 if (token_type(next) != TOKEN_SPECIAL)
1683 return Bad_Func;
1684
1685 if (next->special == ')') {
1686 /* don't complain about those */
1687 if (!n || match_op(next->next, ';'))
1688 return Empty;
1689 warning(next->pos,
1690 "non-ANSI function declaration of function '%s'",
1691 show_ident(*n));
1692 return Empty;
1693 }
1694
1695 if (next->special == SPECIAL_ELLIPSIS) {
1696 warning(next->pos,
1697 "variadic functions must have one named argument");
1698 return Proto;
1699 }
1700
1701 return Bad_Func;
1702 }
1703
1704 static struct token *direct_declarator(struct token *token, struct decl_state *ctx)
1705 {
1706 struct ctype *ctype = &ctx->ctype;
1707 struct token *next;
1708 struct ident **p = ctx->ident;
1709
1710 if (ctx->ident && token_type(token) == TOKEN_IDENT) {
1711 *ctx->ident = token->ident;
1712 token = token->next;
1713 } else if (match_op(token, '(') &&
1714 is_nested(token, &next, ctx->prefer_abstract)) {
1715 struct symbol *base_type = ctype->base_type;
1716 if (token->next != next)
1717 next = handle_attributes(token->next, ctx,
1718 KW_ATTRIBUTE);
1719 token = declarator(next, ctx);
1720 token = expect(token, ')', "in nested declarator");
1721 while (ctype->base_type != base_type)
1722 ctype = &ctype->base_type->ctype;
1723 p = NULL;
1724 }
1725
1726 if (match_op(token, '(')) {
1727 enum kind kind = which_func(token, p, ctx->prefer_abstract);
1728 struct symbol *fn;
1729 fn = alloc_indirect_symbol(token->pos, ctype, SYM_FN);
1730 token = token->next;
1731 if (kind == K_R)
1732 token = identifier_list(token, fn);
1733 else if (kind == Proto)
1734 token = parameter_type_list(token, fn);
1735 token = expect(token, ')', "in function declarator");
1736 fn->endpos = token->pos;
1737 return token;
1738 }
1739
1740 while (match_op(token, '[')) {
1741 struct symbol *array;
1742 array = alloc_indirect_symbol(token->pos, ctype, SYM_ARRAY);
1743 token = abstract_array_declarator(token->next, array);
1744 token = expect(token, ']', "in abstract_array_declarator");
1745 array->endpos = token->pos;
1746 ctype = &array->ctype;
1747 }
1748 return token;
1749 }
1750
1751 static struct token *pointer(struct token *token, struct decl_state *ctx)
1752 {
1753 while (match_op(token,'*')) {
1754 struct symbol *ptr = alloc_symbol(token->pos, SYM_PTR);
1755 ptr->ctype.modifiers = ctx->ctype.modifiers;
1756 ptr->ctype.base_type = ctx->ctype.base_type;
1757 merge_attr(&ptr->ctype, &ctx->ctype);
1758 ctx->ctype.modifiers = 0;
1759 ctx->ctype.base_type = ptr;
1760 ctx->ctype.attribute = &null_attr;
1761 ctx->ctype.alignment = 0;
1762
1763 token = handle_qualifiers(token->next, ctx);
1764 ctx->ctype.base_type->endpos = token->pos;
1765 }
1766 return token;
1767 }
1768
1769 static struct token *declarator(struct token *token, struct decl_state *ctx)
1770 {
1771 token = pointer(token, ctx);
1772 return direct_declarator(token, ctx);
1773 }
1774
1775 static struct token *handle_bitfield(struct token *token, struct decl_state *ctx)
1776 {
1777 struct ctype *ctype = &ctx->ctype;
1778 struct expression *expr;
1779 struct symbol *bitfield;
1780 long long width;
1781
1782 if (ctype->base_type != &int_type && !is_int_type(ctype->base_type)) {
1783 sparse_error(token->pos, "invalid bitfield specifier for type %s.",
1784 show_typename(ctype->base_type));
1785 // Parse this to recover gracefully.
1786 return conditional_expression(token->next, &expr);
1787 }
1788
1789 bitfield = alloc_indirect_symbol(token->pos, ctype, SYM_BITFIELD);
1790 token = conditional_expression(token->next, &expr);
1791 width = const_expression_value(expr);
1792 bitfield->bit_size = width;
1793
1794 if (width < 0 || width > INT_MAX) {
1795 sparse_error(token->pos, "invalid bitfield width, %lld.", width);
1796 width = -1;
1797 } else if (*ctx->ident && width == 0) {
1798 sparse_error(token->pos, "invalid named zero-width bitfield `%s'",
1799 show_ident(*ctx->ident));
1800 width = -1;
1801 } else if (*ctx->ident) {
1802 struct symbol *base_type = bitfield->ctype.base_type;
1803 struct symbol *bitfield_type = base_type == &int_type ? bitfield : base_type;
1804 int is_signed = !(bitfield_type->ctype.modifiers & MOD_UNSIGNED);
1805 if (Wone_bit_signed_bitfield && width == 1 && is_signed) {
1806 // Valid values are either {-1;0} or {0}, depending on integer
1807 // representation. The latter makes for very efficient code...
1808 sparse_error(token->pos, "dubious one-bit signed bitfield");
1809 }
1810 if (Wdefault_bitfield_sign &&
1811 bitfield_type->type != SYM_ENUM &&
1812 !(bitfield_type->ctype.modifiers & MOD_EXPLICITLY_SIGNED) &&
1813 is_signed) {
1814 // The sign of bitfields is unspecified by default.
1815 warning(token->pos, "dubious bitfield without explicit `signed' or `unsigned'");
1816 }
1817 }
1818 bitfield->bit_size = width;
1819 bitfield->endpos = token->pos;
1820 return token;
1821 }
1822
1823 static struct token *declaration_list(struct token *token, struct symbol_list **list)
1824 {
1825 struct decl_state ctx = {.prefer_abstract = 0, .ctype.attribute = &null_attr};
1826 struct ctype saved;
1827 unsigned long mod;
1828
1829 token = declaration_specifiers(token, &ctx);
1830 mod = storage_modifiers(&ctx);
1831 saved = ctx.ctype;
1832 for (;;) {
1833 struct symbol *decl = alloc_symbol(token->pos, SYM_NODE);
1834 ctx.ident = &decl->ident;
1835
1836 token = declarator(token, &ctx);
1837 if (match_op(token, ':'))
1838 token = handle_bitfield(token, &ctx);
1839
1840 token = handle_attributes(token, &ctx, KW_ATTRIBUTE);
1841 apply_modifiers(token->pos, &ctx);
1842
1843 decl->ctype = ctx.ctype;
1844 decl->ctype.modifiers |= mod;
1845 decl->endpos = token->pos;
1846 add_symbol(list, decl);
1847 if (!match_op(token, ','))
1848 break;
1849 token = token->next;
1850 ctx.ctype = saved;
1851 }
1852 return token;
1853 }
1854
1855 static struct token *struct_declaration_list(struct token *token, struct symbol_list **list)
1856 {
1857 while (!match_op(token, '}')) {
1858 if (!match_op(token, ';'))
1859 token = declaration_list(token, list);
1860 if (!match_op(token, ';')) {
1861 sparse_error(token->pos, "expected ; at end of declaration");
1862 break;
1863 }
1864 token = token->next;
1865 }
1866 return token;
1867 }
1868
1869 static struct token *parameter_declaration(struct token *token, struct symbol *sym)
1870 {
1871 struct decl_state ctx = {.prefer_abstract = 1, .ctype.attribute = &null_attr};
1872
1873 token = declaration_specifiers(token, &ctx);
1874 ctx.ident = &sym->ident;
1875 token = declarator(token, &ctx);
1876 token = handle_attributes(token, &ctx, KW_ATTRIBUTE);
1877 apply_modifiers(token->pos, &ctx);
1878 sym->ctype = ctx.ctype;
1879 sym->ctype.modifiers |= storage_modifiers(&ctx);
1880 sym->endpos = token->pos;
1881 sym->forced_arg = ctx.storage_class == SForced;
1882 return token;
1883 }
1884
1885 struct token *typename(struct token *token, struct symbol **p, int *forced)
1886 {
1887 struct decl_state ctx = {.prefer_abstract = 1, .ctype.attribute = &null_attr};
1888 int class;
1889 struct symbol *sym = alloc_symbol(token->pos, SYM_NODE);
1890 *p = sym;
1891 token = declaration_specifiers(token, &ctx);
1892 token = declarator(token, &ctx);
1893 apply_modifiers(token->pos, &ctx);
1894 sym->ctype = ctx.ctype;
1895 sym->endpos = token->pos;
1896 class = ctx.storage_class;
1897 if (forced) {
1898 *forced = 0;
1899 if (class == SForced) {
1900 *forced = 1;
1901 class = 0;
1902 }
1903 }
1904 if (class)
1905 warning(sym->pos, "storage class in typename (%s %s)",
1906 storage_class[class], show_typename(sym));
1907 return token;
1908 }
1909
1910 static struct token *parse_underscore_Pragma(struct token *token)
1911 {
1912 struct token *next;
1913
1914 next = token->next;
1915 if (!match_op(next, '('))
1916 return next;
1917 next = next->next;
1918 if (next->pos.type != TOKEN_STRING)
1919 return next;
1920 next = next->next;
1921 if (!match_op(next, ')'))
1922 return next;
1923 return next->next;
1924 }
1925
1926 static struct token *expression_statement(struct token *token, struct expression **tree)
1927 {
1928 if (match_ident(token, &_Pragma_ident))
1929 return parse_underscore_Pragma(token);
1930
1931 token = parse_expression(token, tree);
1932 return expect(token, ';', "at end of statement");
1933 }
1934
1935 static struct token *parse_asm_operands(struct token *token, struct statement *stmt,
1936 struct expression_list **inout)
1937 {
1938 struct expression *expr;
1939
1940 /* Allow empty operands */
1941 if (match_op(token->next, ':') || match_op(token->next, ')'))
1942 return token->next;
1943 do {
1944 struct ident *ident = NULL;
1945 if (match_op(token->next, '[') &&
1946 token_type(token->next->next) == TOKEN_IDENT &&
1947 match_op(token->next->next->next, ']')) {
1948 ident = token->next->next->ident;
1949 token = token->next->next->next;
1950 }
1951 add_expression(inout, (struct expression *)ident); /* UGGLEE!!! */
1952 token = primary_expression(token->next, &expr);
1953 add_expression(inout, expr);
1954 token = parens_expression(token, &expr, "in asm parameter");
1955 add_expression(inout, expr);
1956 } while (match_op(token, ','));
1957 return token;
1958 }
1959
1960 static struct token *parse_asm_clobbers(struct token *token, struct statement *stmt,
1961 struct expression_list **clobbers)
1962 {
1963 struct expression *expr;
1964
1965 do {
1966 token = primary_expression(token->next, &expr);
1967 if (expr)
1968 add_expression(clobbers, expr);
1969 } while (match_op(token, ','));
1970 return token;
1971 }
1972
1973 static struct token *parse_asm_labels(struct token *token, struct statement *stmt,
1974 struct symbol_list **labels)
1975 {
1976 struct symbol *label;
1977
1978 do {
1979 token = token->next; /* skip ':' and ',' */
1980 if (token_type(token) != TOKEN_IDENT)
1981 return token;
1982 label = label_symbol(token);
1983 add_symbol(labels, label);
1984 token = token->next;
1985 } while (match_op(token, ','));
1986 return token;
1987 }
1988
1989 static struct token *parse_asm_statement(struct token *token, struct statement *stmt)
1990 {
1991 int is_goto = 0;
1992
1993 token = token->next;
1994 stmt->type = STMT_ASM;
1995 if (match_idents(token, &__volatile___ident, &__volatile_ident, &volatile_ident, NULL)) {
1996 token = token->next;
1997 }
1998 if (token_type(token) == TOKEN_IDENT && token->ident == &goto_ident) {
1999 is_goto = 1;
2000 token = token->next;
2001 }
2002 token = expect(token, '(', "after asm");
2003 token = parse_expression(token, &stmt->asm_string);
2004 if (match_op(token, ':'))
2005 token = parse_asm_operands(token, stmt, &stmt->asm_outputs);
2006 if (match_op(token, ':'))
2007 token = parse_asm_operands(token, stmt, &stmt->asm_inputs);
2008 if (match_op(token, ':'))
2009 token = parse_asm_clobbers(token, stmt, &stmt->asm_clobbers);
2010 if (is_goto && match_op(token, ':'))
2011 token = parse_asm_labels(token, stmt, &stmt->asm_labels);
2012 token = expect(token, ')', "after asm");
2013 return expect(token, ';', "at end of asm-statement");
2014 }
2015
2016 static struct token *parse_asm_declarator(struct token *token, struct decl_state *ctx)
2017 {
2018 struct expression *expr;
2019 token = expect(token, '(', "after asm");
2020 token = parse_expression(token->next, &expr);
2021 token = expect(token, ')', "after asm");
2022 return token;
2023 }
2024
2025 /* Make a statement out of an expression */
2026 static struct statement *make_statement(struct expression *expr)
2027 {
2028 struct statement *stmt;
2029
2030 if (!expr)
2031 return NULL;
2032 stmt = alloc_statement(expr->pos, STMT_EXPRESSION);
2033 stmt->expression = expr;
2034 return stmt;
2035 }
2036
2037 /*
2038 * All iterators have two symbols associated with them:
2039 * the "continue" and "break" symbols, which are targets
2040 * for continue and break statements respectively.
2041 *
2042 * They are in a special name-space, but they follow
2043 * all the normal visibility rules, so nested iterators
2044 * automatically work right.
2045 */
2046 static void start_iterator(struct statement *stmt)
2047 {
2048 struct symbol *cont, *brk;
2049
2050 start_symbol_scope(stmt->pos);
2051 cont = alloc_symbol(stmt->pos, SYM_NODE);
2052 cont->stmt = stmt;
2053 bind_symbol(cont, &continue_ident, NS_ITERATOR);
2054 brk = alloc_symbol(stmt->pos, SYM_NODE);
2055 brk->stmt = stmt;
2056 bind_symbol(brk, &break_ident, NS_ITERATOR);
2057
2058 stmt->type = STMT_ITERATOR;
2059 stmt->iterator_break = brk;
2060 stmt->iterator_continue = cont;
2061 fn_local_symbol(brk);
2062 fn_local_symbol(cont);
2063 }
2064
2065 static void end_iterator(struct statement *stmt)
2066 {
2067 end_symbol_scope();
2068 }
2069
2070 static struct statement *start_function(struct symbol *sym)
2071 {
2072 struct symbol *ret;
2073 struct statement *stmt = alloc_statement(sym->pos, STMT_COMPOUND);
2074
2075 start_function_scope(stmt->pos);
2076 ret = alloc_symbol(sym->pos, SYM_NODE);
2077 ret->ctype = sym->ctype.base_type->ctype;
2078 ret->ctype.modifiers &= ~(MOD_STORAGE | MOD_CONST | MOD_VOLATILE | MOD_TLS | MOD_INLINE | MOD_ADDRESSABLE | MOD_NOCAST | MOD_NODEREF | MOD_ACCESSED | MOD_TOPLEVEL);
2079 ret->ctype.modifiers |= (MOD_AUTO | MOD_REGISTER);
2080 bind_symbol(ret, &return_ident, NS_ITERATOR);
2081 stmt->ret = ret;
2082 fn_local_symbol(ret);
2083
2084 // Currently parsed symbol for __func__/__FUNCTION__/__PRETTY_FUNCTION__
2085 current_fn = sym;
2086
2087 return stmt;
2088 }
2089
2090 static void end_function(struct symbol *sym)
2091 {
2092 current_fn = NULL;
2093 end_function_scope();
2094 }
2095
2096 /*
2097 * A "switch()" statement, like an iterator, has a
2098 * the "break" symbol associated with it. It works
2099 * exactly like the iterator break - it's the target
2100 * for any break-statements in scope, and means that
2101 * "break" handling doesn't even need to know whether
2102 * it's breaking out of an iterator or a switch.
2103 *
2104 * In addition, the "case" symbol is a marker for the
2105 * case/default statements to find the switch statement
2106 * that they are associated with.
2107 */
2108 static void start_switch(struct statement *stmt)
2109 {
2110 struct symbol *brk, *switch_case;
2111
2112 start_symbol_scope(stmt->pos);
2113 brk = alloc_symbol(stmt->pos, SYM_NODE);
2114 brk->stmt = stmt;
2115 bind_symbol(brk, &break_ident, NS_ITERATOR);
2116
2117 switch_case = alloc_symbol(stmt->pos, SYM_NODE);
2118 bind_symbol(switch_case, &case_ident, NS_ITERATOR);
2119 switch_case->stmt = stmt;
2120
2121 stmt->type = STMT_SWITCH;
2122 stmt->switch_break = brk;
2123 stmt->switch_case = switch_case;
2124
2125 fn_local_symbol(brk);
2126 fn_local_symbol(switch_case);
2127 }
2128
2129 static void end_switch(struct statement *stmt)
2130 {
2131 if (!stmt->switch_case->symbol_list)
2132 warning(stmt->pos, "switch with no cases");
2133 end_symbol_scope();
2134 }
2135
2136 static void add_case_statement(struct statement *stmt)
2137 {
2138 struct symbol *target = lookup_symbol(&case_ident, NS_ITERATOR);
2139 struct symbol *sym;
2140
2141 if (!target) {
2142 sparse_error(stmt->pos, "not in switch scope");
2143 stmt->type = STMT_NONE;
2144 return;
2145 }
2146 sym = alloc_symbol(stmt->pos, SYM_NODE);
2147 add_symbol(&target->symbol_list, sym);
2148 sym->stmt = stmt;
2149 stmt->case_label = sym;
2150 fn_local_symbol(sym);
2151 }
2152
2153 static struct token *parse_return_statement(struct token *token, struct statement *stmt)
2154 {
2155 struct symbol *target = lookup_symbol(&return_ident, NS_ITERATOR);
2156
2157 if (!target)
2158 error_die(token->pos, "internal error: return without a function target");
2159 stmt->type = STMT_RETURN;
2160 stmt->ret_target = target;
2161 return expression_statement(token->next, &stmt->ret_value);
2162 }
2163
2164 static struct token *parse_for_statement(struct token *token, struct statement *stmt)
2165 {
2166 struct symbol_list *syms;
2167 struct expression *e1, *e2, *e3;
2168 struct statement *iterator;
2169
2170 start_iterator(stmt);
2171 token = expect(token->next, '(', "after 'for'");
2172
2173 syms = NULL;
2174 e1 = NULL;
2175 /* C99 variable declaration? */
2176 if (lookup_type(token)) {
2177 token = external_declaration(token, &syms);
2178 } else {
2179 token = parse_expression(token, &e1);
2180 token = expect(token, ';', "in 'for'");
2181 }
2182 token = parse_expression(token, &e2);
2183 token = expect(token, ';', "in 'for'");
2184 token = parse_expression(token, &e3);
2185 token = expect(token, ')', "in 'for'");
2186 token = statement(token, &iterator);
2187
2188 stmt->iterator_syms = syms;
2189 stmt->iterator_pre_statement = make_statement(e1);
2190 stmt->iterator_pre_condition = e2;
2191 stmt->iterator_post_statement = make_statement(e3);
2192 stmt->iterator_post_condition = NULL;
2193 stmt->iterator_statement = iterator;
2194 end_iterator(stmt);
2195
2196 return token;
2197 }
2198
2199 static struct token *parse_while_statement(struct token *token, struct statement *stmt)
2200 {
2201 struct expression *expr;
2202 struct statement *iterator;
2203
2204 start_iterator(stmt);
2205 token = parens_expression(token->next, &expr, "after 'while'");
2206 token = statement(token, &iterator);
2207
2208 stmt->iterator_pre_condition = expr;
2209 stmt->iterator_post_condition = NULL;
2210 stmt->iterator_statement = iterator;
2211 end_iterator(stmt);
2212
2213 return token;
2214 }
2215
2216 static struct token *parse_do_statement(struct token *token, struct statement *stmt)
2217 {
2218 struct expression *expr;
2219 struct statement *iterator;
2220
2221 start_iterator(stmt);
2222 token = statement(token->next, &iterator);
2223 if (token_type(token) == TOKEN_IDENT && token->ident == &while_ident)
2224 token = token->next;
2225 else
2226 sparse_error(token->pos, "expected 'while' after 'do'");
2227 token = parens_expression(token, &expr, "after 'do-while'");
2228
2229 stmt->iterator_post_condition = expr;
2230 stmt->iterator_statement = iterator;
2231 end_iterator(stmt);
2232
2233 if (iterator && iterator->type != STMT_COMPOUND && Wdo_while)
2234 warning(iterator->pos, "do-while statement is not a compound statement");
2235
2236 return expect(token, ';', "after statement");
2237 }
2238
2239 static struct token *parse_if_statement(struct token *token, struct statement *stmt)
2240 {
2241 stmt->type = STMT_IF;
2242 token = parens_expression(token->next, &stmt->if_conditional, "after if");
2243 token = statement(token, &stmt->if_true);
2244 if (token_type(token) != TOKEN_IDENT)
2245 return token;
2246 if (token->ident != &else_ident)
2247 return token;
2248 return statement(token->next, &stmt->if_false);
2249 }
2250
2251 static inline struct token *case_statement(struct token *token, struct statement *stmt)
2252 {
2253 stmt->type = STMT_CASE;
2254 token = expect(token, ':', "after default/case");
2255 add_case_statement(stmt);
2256 return statement(token, &stmt->case_statement);
2257 }
2258
2259 static struct token *parse_case_statement(struct token *token, struct statement *stmt)
2260 {
2261 token = parse_expression(token->next, &stmt->case_expression);
2262 if (match_op(token, SPECIAL_ELLIPSIS))
2263 token = parse_expression(token->next, &stmt->case_to);
2264 return case_statement(token, stmt);
2265 }
2266
2267 static struct token *parse_default_statement(struct token *token, struct statement *stmt)
2268 {
2269 return case_statement(token->next, stmt);
2270 }
2271
2272 static struct token *parse_loop_iterator(struct token *token, struct statement *stmt)
2273 {
2274 struct symbol *target = lookup_symbol(token->ident, NS_ITERATOR);
2275 stmt->type = STMT_GOTO;
2276 stmt->goto_label = target;
2277 if (!target)
2278 sparse_error(stmt->pos, "break/continue not in iterator scope");
2279 return expect(token->next, ';', "at end of statement");
2280 }
2281
2282 static struct token *parse_switch_statement(struct token *token, struct statement *stmt)
2283 {
2284 stmt->type = STMT_SWITCH;
2285 start_switch(stmt);
2286 token = parens_expression(token->next, &stmt->switch_expression, "after 'switch'");
2287 token = statement(token, &stmt->switch_statement);
2288 end_switch(stmt);
2289 return token;
2290 }
2291
2292 static struct token *parse_goto_statement(struct token *token, struct statement *stmt)
2293 {
2294 stmt->type = STMT_GOTO;
2295 token = token->next;
2296 if (match_op(token, '*')) {
2297 token = parse_expression(token->next, &stmt->goto_expression);
2298 add_statement(&function_computed_goto_list, stmt);
2299 } else if (token_type(token) == TOKEN_IDENT) {
2300 stmt->goto_label = label_symbol(token);
2301 token = token->next;
2302 } else {
2303 sparse_error(token->pos, "Expected identifier or goto expression");
2304 }
2305 return expect(token, ';', "at end of statement");
2306 }
2307
2308 static struct token *parse_context_statement(struct token *token, struct statement *stmt)
2309 {
2310 stmt->type = STMT_CONTEXT;
2311 token = parse_expression(token->next, &stmt->expression);
2312 if (stmt->expression->type == EXPR_PREOP
2313 && stmt->expression->op == '('
2314 && stmt->expression->unop->type == EXPR_COMMA) {
2315 struct expression *expr;
2316 expr = stmt->expression->unop;
2317 stmt->context = expr->left;
2318 stmt->expression = expr->right;
2319 }
2320 return expect(token, ';', "at end of statement");
2321 }
2322
2323 static struct token *parse_range_statement(struct token *token, struct statement *stmt)
2324 {
2325 stmt->type = STMT_RANGE;
2326 token = assignment_expression(token->next, &stmt->range_expression);
2327 token = expect(token, ',', "after range expression");
2328 token = assignment_expression(token, &stmt->range_low);
2329 token = expect(token, ',', "after low range");
2330 token = assignment_expression(token, &stmt->range_high);
2331 return expect(token, ';', "after range statement");
2332 }
2333
2334 static struct token *statement(struct token *token, struct statement **tree)
2335 {
2336 struct statement *stmt = alloc_statement(token->pos, STMT_NONE);
2337
2338 *tree = stmt;
2339 if (token_type(token) == TOKEN_IDENT) {
2340 struct symbol *s = lookup_keyword(token->ident, NS_KEYWORD);
2341 if (s && s->op->statement)
2342 return s->op->statement(token, stmt);
2343
2344 if (match_op(token->next, ':')) {
2345 struct symbol *s = label_symbol(token);
2346 stmt->type = STMT_LABEL;
2347 stmt->label_identifier = s;
2348 if (s->stmt)
2349 sparse_error(stmt->pos, "label '%s' redefined", show_ident(token->ident));
2350 s->stmt = stmt;
2351 token = skip_attributes(token->next->next);
2352 return statement(token, &stmt->label_statement);
2353 }
2354 }
2355
2356 if (match_op(token, '{')) {
2357 stmt->type = STMT_COMPOUND;
2358 start_symbol_scope(stmt->pos);
2359 token = compound_statement(token->next, stmt);
2360 end_symbol_scope();
2361
2362 return expect(token, '}', "at end of compound statement");
2363 }
2364
2365 stmt->type = STMT_EXPRESSION;
2366 return expression_statement(token, &stmt->expression);
2367 }
2368
2369 /* gcc extension - __label__ ident-list; in the beginning of compound stmt */
2370 static struct token *label_statement(struct token *token)
2371 {
2372 while (token_type(token) == TOKEN_IDENT) {
2373 struct symbol *sym = alloc_symbol(token->pos, SYM_LABEL);
2374 /* it's block-scope, but we want label namespace */
2375 bind_symbol(sym, token->ident, NS_SYMBOL);
2376 sym->namespace = NS_LABEL;
2377 fn_local_symbol(sym);
2378 token = token->next;
2379 if (!match_op(token, ','))
2380 break;
2381 token = token->next;
2382 }
2383 return expect(token, ';', "at end of label declaration");
2384 }
2385
2386 static struct token * statement_list(struct token *token, struct statement_list **list)
2387 {
2388 int seen_statement = 0;
2389 while (token_type(token) == TOKEN_IDENT &&
2390 token->ident == &__label___ident)
2391 token = label_statement(token->next);
2392 for (;;) {
2393 struct statement * stmt;
2394 if (eof_token(token))
2395 break;
2396 if (match_op(token, '}'))
2397 break;
2398 if (lookup_type(token)) {
2399 if (seen_statement) {
2400 warning(token->pos, "mixing declarations and code");
2401 seen_statement = 0;
2402 }
2403 stmt = alloc_statement(token->pos, STMT_DECLARATION);
2404 token = external_declaration(token, &stmt->declaration);
2405 } else {
2406 seen_statement = Wdeclarationafterstatement;
2407 token = statement(token, &stmt);
2408 }
2409 add_statement(list, stmt);
2410 }
2411 return token;
2412 }
2413
2414 static struct token *identifier_list(struct token *token, struct symbol *fn)
2415 {
2416 struct symbol_list **list = &fn->arguments;
2417 for (;;) {
2418 struct symbol *sym = alloc_symbol(token->pos, SYM_NODE);
2419 sym->ident = token->ident;
2420 token = token->next;
2421 sym->endpos = token->pos;
2422 sym->ctype.base_type = &incomplete_ctype;
2423 add_symbol(list, sym);
2424 if (!match_op(token, ',') ||
2425 token_type(token->next) != TOKEN_IDENT ||
2426 lookup_type(token->next))
2427 break;
2428 token = token->next;
2429 }
2430 return token;
2431 }
2432
2433 static struct token *parameter_type_list(struct token *token, struct symbol *fn)
2434 {
2435 struct symbol_list **list = &fn->arguments;
2436
2437 for (;;) {
2438 struct symbol *sym;
2439
2440 if (match_op(token, SPECIAL_ELLIPSIS)) {
2441 fn->variadic = 1;
2442 token = token->next;
2443 break;
2444 }
2445
2446 sym = alloc_symbol(token->pos, SYM_NODE);
2447 token = parameter_declaration(token, sym);
2448 if (sym->ctype.base_type == &void_ctype) {
2449 /* Special case: (void) */
2450 if (!*list && !sym->ident)
2451 break;
2452 warning(token->pos, "void parameter");
2453 }
2454 add_symbol(list, sym);
2455 if (!match_op(token, ','))
2456 break;
2457 token = token->next;
2458 }
2459 return token;
2460 }
2461
2462 struct token *compound_statement(struct token *token, struct statement *stmt)
2463 {
2464 token = statement_list(token, &stmt->stmts);
2465 return token;
2466 }
2467
2468 static struct expression *identifier_expression(struct token *token)
2469 {
2470 struct expression *expr = alloc_expression(token->pos, EXPR_IDENTIFIER);
2471 expr->expr_ident = token->ident;
2472 return expr;
2473 }
2474
2475 static struct expression *index_expression(struct expression *from, struct expression *to)
2476 {
2477 int idx_from, idx_to;
2478 struct expression *expr = alloc_expression(from->pos, EXPR_INDEX);
2479
2480 idx_from = const_expression_value(from);
2481 idx_to = idx_from;
2482 if (to) {
2483 idx_to = const_expression_value(to);
2484 if (idx_to < idx_from || idx_from < 0)
2485 warning(from->pos, "nonsense array initializer index range");
2486 }
2487 expr->idx_from = idx_from;
2488 expr->idx_to = idx_to;
2489 return expr;
2490 }
2491
2492 static struct token *single_initializer(struct expression **ep, struct token *token)
2493 {
2494 int expect_equal = 0;
2495 struct token *next = token->next;
2496 struct expression **tail = ep;
2497 int nested;
2498
2499 *ep = NULL;
2500
2501 if ((token_type(token) == TOKEN_IDENT) && match_op(next, ':')) {
2502 struct expression *expr = identifier_expression(token);
2503 if (Wold_initializer)
2504 warning(token->pos, "obsolete struct initializer, use C99 syntax");
2505 token = initializer(&expr->ident_expression, next->next);
2506 if (expr->ident_expression)
2507 *ep = expr;
2508 return token;
2509 }
2510
2511 for (tail = ep, nested = 0; ; nested++, next = token->next) {
2512 if (match_op(token, '.') && (token_type(next) == TOKEN_IDENT)) {
2513 struct expression *expr = identifier_expression(next);
2514 *tail = expr;
2515 tail = &expr->ident_expression;
2516 expect_equal = 1;
2517 token = next->next;
2518 } else if (match_op(token, '[')) {
2519 struct expression *from = NULL, *to = NULL, *expr;
2520 token = constant_expression(token->next, &from);
2521 if (!from) {
2522 sparse_error(token->pos, "Expected constant expression");
2523 break;
2524 }
2525 if (match_op(token, SPECIAL_ELLIPSIS))
2526 token = constant_expression(token->next, &to);
2527 expr = index_expression(from, to);
2528 *tail = expr;
2529 tail = &expr->idx_expression;
2530 token = expect(token, ']', "at end of initializer index");
2531 if (nested)
2532 expect_equal = 1;
2533 } else {
2534 break;
2535 }
2536 }
2537 if (nested && !expect_equal) {
2538 if (!match_op(token, '='))
2539 warning(token->pos, "obsolete array initializer, use C99 syntax");
2540 else
2541 expect_equal = 1;
2542 }
2543 if (expect_equal)
2544 token = expect(token, '=', "at end of initializer index");
2545
2546 token = initializer(tail, token);
2547 if (!*tail)
2548 *ep = NULL;
2549 return token;
2550 }
2551
2552 static struct token *initializer_list(struct expression_list **list, struct token *token)
2553 {
2554 struct expression *expr;
2555
2556 for (;;) {
2557 token = single_initializer(&expr, token);
2558 if (!expr)
2559 break;
2560 add_expression(list, expr);
2561 if (!match_op(token, ','))
2562 break;
2563 token = token->next;
2564 }
2565 return token;
2566 }
2567
2568 struct token *initializer(struct expression **tree, struct token *token)
2569 {
2570 if (match_op(token, '{')) {
2571 struct expression *expr = alloc_expression(token->pos, EXPR_INITIALIZER);
2572 *tree = expr;
2573 token = initializer_list(&expr->expr_list, token->next);
2574 return expect(token, '}', "at end of initializer");
2575 }
2576 return assignment_expression(token, tree);
2577 }
2578
2579 static void declare_argument(struct symbol *sym, struct symbol *fn)
2580 {
2581 if (!sym->ident) {
2582 sparse_error(sym->pos, "no identifier for function argument");
2583 return;
2584 }
2585 bind_symbol(sym, sym->ident, NS_SYMBOL);
2586 }
2587
2588 static struct token *parse_function_body(struct token *token, struct symbol *decl,
2589 struct symbol_list **list)
2590 {
2591 struct symbol_list **old_symbol_list;
2592 struct symbol *base_type = decl->ctype.base_type;
2593 struct statement *stmt, **p;
2594 struct symbol *prev;
2595 struct symbol *arg;
2596
2597 old_symbol_list = function_symbol_list;
2598 if (decl->ctype.modifiers & MOD_INLINE) {
2599 function_symbol_list = &decl->inline_symbol_list;
2600 p = &base_type->inline_stmt;
2601 } else {
2602 function_symbol_list = &decl->symbol_list;
2603 p = &base_type->stmt;
2604 }
2605 function_computed_target_list = NULL;
2606 function_computed_goto_list = NULL;
2607
2608 if (decl->ctype.modifiers & MOD_EXTERN) {
2609 if (!(decl->ctype.modifiers & MOD_INLINE))
2610 warning(decl->pos, "function '%s' with external linkage has definition", show_ident(decl->ident));
2611 }
2612 if (!(decl->ctype.modifiers & MOD_STATIC))
2613 decl->ctype.modifiers |= MOD_EXTERN;
2614
2615 stmt = start_function(decl);
2616
2617 *p = stmt;
2618 FOR_EACH_PTR (base_type->arguments, arg) {
2619 declare_argument(arg, base_type);
2620 } END_FOR_EACH_PTR(arg);
2621
2622 token = compound_statement(token->next, stmt);
2623
2624 end_function(decl);
2625 if (!(decl->ctype.modifiers & MOD_INLINE))
2626 add_symbol(list, decl);
2627 check_declaration(decl);
2628 decl->definition = decl;
2629 prev = decl->same_symbol;
2630 if (prev && prev->definition) {
2631 warning(decl->pos, "multiple definitions for function '%s'",
2632 show_ident(decl->ident));
2633 info(prev->definition->pos, " the previous one is here");
2634 } else {
2635 while (prev) {
2636 rebind_scope(prev, decl->scope);
2637 prev->definition = decl;
2638 prev = prev->same_symbol;
2639 }
2640 }
2641 function_symbol_list = old_symbol_list;
2642 if (function_computed_goto_list) {
2643 if (!function_computed_target_list)
2644 warning(decl->pos, "function '%s' has computed goto but no targets?", show_ident(decl->ident));
2645 else {
2646 FOR_EACH_PTR(function_computed_goto_list, stmt) {
2647 stmt->target_list = function_computed_target_list;
2648 } END_FOR_EACH_PTR(stmt);
2649 }
2650 }
2651 return expect(token, '}', "at end of function");
2652 }
2653
2654 static void promote_k_r_types(struct symbol *arg)
2655 {
2656 struct symbol *base = arg->ctype.base_type;
2657 if (base && base->ctype.base_type == &int_type && (base->ctype.modifiers & (MOD_CHAR | MOD_SHORT))) {
2658 arg->ctype.base_type = &int_ctype;
2659 }
2660 }
2661
2662 static void apply_k_r_types(struct symbol_list *argtypes, struct symbol *fn)
2663 {
2664 struct symbol_list *real_args = fn->ctype.base_type->arguments;
2665 struct symbol *arg;
2666
2667 FOR_EACH_PTR(real_args, arg) {
2668 struct symbol *type;
2669
2670 /* This is quadratic in the number of arguments. We _really_ don't care */
2671 FOR_EACH_PTR(argtypes, type) {
2672 if (type->ident == arg->ident)
2673 goto match;
2674 } END_FOR_EACH_PTR(type);
2675 sparse_error(arg->pos, "missing type declaration for parameter '%s'", show_ident(arg->ident));
2676 continue;
2677 match:
2678 type->used = 1;
2679 /* "char" and "short" promote to "int" */
2680 promote_k_r_types(type);
2681
2682 arg->ctype = type->ctype;
2683 } END_FOR_EACH_PTR(arg);
2684
2685 FOR_EACH_PTR(argtypes, arg) {
2686 if (!arg->used)
2687 warning(arg->pos, "nonsensical parameter declaration '%s'", show_ident(arg->ident));
2688 } END_FOR_EACH_PTR(arg);
2689
2690 }
2691
2692 static struct token *parse_k_r_arguments(struct token *token, struct symbol *decl,
2693 struct symbol_list **list)
2694 {
2695 struct symbol_list *args = NULL;
2696
2697 warning(token->pos, "non-ANSI definition of function '%s'", show_ident(decl->ident));
2698 do {
2699 token = declaration_list(token, &args);
2700 if (!match_op(token, ';')) {
2701 sparse_error(token->pos, "expected ';' at end of parameter declaration");
2702 break;
2703 }
2704 token = token->next;
2705 } while (lookup_type(token));
2706
2707 apply_k_r_types(args, decl);
2708
2709 if (!match_op(token, '{')) {
2710 sparse_error(token->pos, "expected function body");
2711 return token;
2712 }
2713 return parse_function_body(token, decl, list);
2714 }
2715
2716 static struct token *toplevel_asm_declaration(struct token *token, struct symbol_list **list)
2717 {
2718 struct symbol *anon = alloc_symbol(token->pos, SYM_NODE);
2719 struct symbol *fn = alloc_symbol(token->pos, SYM_FN);
2720 struct statement *stmt;
2721
2722 anon->ctype.base_type = fn;
2723 stmt = alloc_statement(token->pos, STMT_NONE);
2724 fn->stmt = stmt;
2725
2726 token = parse_asm_statement(token, stmt);
2727
2728 add_symbol(list, anon);
2729 return token;
2730 }
2731
2732 struct token *external_declaration(struct token *token, struct symbol_list **list)
2733 {
2734 struct ident *ident = NULL;
2735 struct symbol *decl;
2736 struct decl_state ctx = { .ident = &ident, .ctype.attribute = &null_attr};
2737 struct ctype saved;
2738 struct symbol *base_type;
2739 unsigned long mod;
2740 int is_typedef;
2741
2742 if (match_ident(token, &_Pragma_ident))
2743 return parse_underscore_Pragma(token);
2744
2745 /* Top-level inline asm? */
2746 if (token_type(token) == TOKEN_IDENT) {
2747 struct symbol *s = lookup_keyword(token->ident, NS_KEYWORD);
2748 if (s && s->op->toplevel)
2749 return s->op->toplevel(token, list);
2750 }
2751
2752 /* Parse declaration-specifiers, if any */
2753 token = declaration_specifiers(token, &ctx);
2754 mod = storage_modifiers(&ctx);
2755 decl = alloc_symbol(token->pos, SYM_NODE);
2756 /* Just a type declaration? */
2757 if (match_op(token, ';')) {
2758 apply_modifiers(token->pos, &ctx);
2759 return token->next;
2760 }
2761
2762 saved = ctx.ctype;
2763 token = declarator(token, &ctx);
2764 token = handle_attributes(token, &ctx, KW_ATTRIBUTE | KW_ASM);
2765 apply_modifiers(token->pos, &ctx);
2766
2767 decl->ctype = ctx.ctype;
2768 decl->ctype.modifiers |= mod;
2769 decl->endpos = token->pos;
2770
2771 /* Just a type declaration? */
2772 if (!ident) {
2773 warning(token->pos, "missing identifier in declaration");
2774 return expect(token, ';', "at the end of type declaration");
2775 }
2776
2777 /* type define declaration? */
2778 is_typedef = ctx.storage_class == STypedef;
2779
2780 /* Typedefs don't have meaningful storage */
2781 if (is_typedef)
2782 decl->ctype.modifiers |= MOD_USERTYPE;
2783
2784 bind_symbol(decl, ident, is_typedef ? NS_TYPEDEF: NS_SYMBOL);
2785
2786 base_type = decl->ctype.base_type;
2787
2788 if (is_typedef) {
2789 if (base_type && !base_type->ident) {
2790 switch (base_type->type) {
2791 case SYM_STRUCT:
2792 case SYM_UNION:
2793 case SYM_ENUM:
2794 case SYM_RESTRICT:
2795 base_type->ident = ident;
2796 }
2797 }
2798 } else if (base_type && base_type->type == SYM_FN) {
2799 /* K&R argument declaration? */
2800 if (lookup_type(token))
2801 return parse_k_r_arguments(token, decl, list);
2802 if (match_op(token, '{'))
2803 return parse_function_body(token, decl, list);
2804
2805 if (!(decl->ctype.modifiers & MOD_STATIC))
2806 decl->ctype.modifiers |= MOD_EXTERN;
2807 } else if (base_type == &void_ctype && !(decl->ctype.modifiers & MOD_EXTERN)) {
2808 sparse_error(token->pos, "void declaration");
2809 }
2810
2811 for (;;) {
2812 if (!is_typedef && match_op(token, '=')) {
2813 if (decl->ctype.modifiers & MOD_EXTERN) {
2814 warning(decl->pos, "symbol with external linkage has initializer");
2815 decl->ctype.modifiers &= ~MOD_EXTERN;
2816 }
2817 token = initializer(&decl->initializer, token->next);
2818 }
2819 if (!is_typedef) {
2820 if (!(decl->ctype.modifiers & (MOD_EXTERN | MOD_INLINE))) {
2821 add_symbol(list, decl);
2822 fn_local_symbol(decl);
2823 }
2824 }
2825 check_declaration(decl);
2826 if (decl->same_symbol)
2827 decl->definition = decl->same_symbol->definition;
2828
2829 if (!match_op(token, ','))
2830 break;
2831
2832 token = token->next;
2833 ident = NULL;
2834 decl = alloc_symbol(token->pos, SYM_NODE);
2835 ctx.ctype = saved;
2836 token = handle_attributes(token, &ctx, KW_ATTRIBUTE);
2837 token = declarator(token, &ctx);
2838 token = handle_attributes(token, &ctx, KW_ATTRIBUTE | KW_ASM);
2839 apply_modifiers(token->pos, &ctx);
2840 decl->ctype = ctx.ctype;
2841 decl->ctype.modifiers |= mod;
2842 decl->endpos = token->pos;
2843 if (!ident) {
2844 sparse_error(token->pos, "expected identifier name in type definition");
2845 return token;
2846 }
2847
2848 if (is_typedef)
2849 decl->ctype.modifiers |= MOD_USERTYPE;
2850
2851 bind_symbol(decl, ident, is_typedef ? NS_TYPEDEF: NS_SYMBOL);
2852
2853 /* Function declarations are automatically extern unless specifically static */
2854 base_type = decl->ctype.base_type;
2855 if (!is_typedef && base_type && base_type->type == SYM_FN) {
2856 if (!(decl->ctype.modifiers & MOD_STATIC))
2857 decl->ctype.modifiers |= MOD_EXTERN;
2858 }
2859 }
2860 return expect(token, ';', "at end of declaration");
2861 }
Static analysis for C