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unwind: add more unwind functions
[smatch.git] / parse.c
blob9074b1def893d6b23a11adf983c0e1abf74a2aa3
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
423 /* Storage class */
424 { "auto", NS_TYPEDEF, .op = &auto_op },
425 { "register", NS_TYPEDEF, .op = &register_op },
426 { "static", NS_TYPEDEF, .op = &static_op },
427 { "extern", NS_TYPEDEF, .op = &extern_op },
428 { "__thread", NS_TYPEDEF, .op = &thread_op },
429
430 /* Statement */
431 { "if", NS_KEYWORD, .op = &if_op },
432 { "return", NS_KEYWORD, .op = &return_op },
433 { "break", NS_KEYWORD, .op = &loop_iter_op },
434 { "continue", NS_KEYWORD, .op = &loop_iter_op },
435 { "default", NS_KEYWORD, .op = &default_op },
436 { "case", NS_KEYWORD, .op = &case_op },
437 { "switch", NS_KEYWORD, .op = &switch_op },
438 { "for", NS_KEYWORD, .op = &for_op },
439 { "while", NS_KEYWORD, .op = &while_op },
440 { "do", NS_KEYWORD, .op = &do_op },
441 { "goto", NS_KEYWORD, .op = &goto_op },
442 { "__context__",NS_KEYWORD, .op = &__context___op },
443 { "__range__", NS_KEYWORD, .op = &range_op },
444 { "asm", NS_KEYWORD, .op = &asm_op },
445 { "__asm", NS_KEYWORD, .op = &asm_op },
446 { "__asm__", NS_KEYWORD, .op = &asm_op },
447
448 /* Attribute */
449 { "packed", NS_KEYWORD, .op = &packed_op },
450 { "__packed__", NS_KEYWORD, .op = &packed_op },
451 { "aligned", NS_KEYWORD, .op = &aligned_op },
452 { "__aligned__",NS_KEYWORD, .op = &aligned_op },
453 { "nocast", NS_KEYWORD, MOD_NOCAST, .op = &attr_mod_op },
454 { "noderef", NS_KEYWORD, MOD_NODEREF, .op = &attr_mod_op },
455 { "safe", NS_KEYWORD, MOD_SAFE, .op = &attr_mod_op },
456 { "force", NS_KEYWORD, .op = &attr_force_op },
457 { "bitwise", NS_KEYWORD, MOD_BITWISE, .op = &attr_mod_op },
458 { "__bitwise__",NS_KEYWORD, MOD_BITWISE, .op = &attr_mod_op },
459 { "address_space",NS_KEYWORD, .op = &address_space_op },
460 { "mode", NS_KEYWORD, .op = &mode_op },
461 { "context", NS_KEYWORD, .op = &context_op },
462 { "designated_init", NS_KEYWORD, .op = &designated_init_op },
463 { "__transparent_union__", NS_KEYWORD, .op = &transparent_union_op },
464 { "noreturn", NS_KEYWORD, MOD_NORETURN, .op = &attr_mod_op },
465 { "__noreturn__", NS_KEYWORD, MOD_NORETURN, .op = &attr_mod_op },
466
467 { "__mode__", NS_KEYWORD, .op = &mode_op },
468 { "QI", NS_KEYWORD, MOD_CHAR, .op = &mode_QI_op },
469 { "__QI__", NS_KEYWORD, MOD_CHAR, .op = &mode_QI_op },
470 { "HI", NS_KEYWORD, MOD_SHORT, .op = &mode_HI_op },
471 { "__HI__", NS_KEYWORD, MOD_SHORT, .op = &mode_HI_op },
472 { "SI", NS_KEYWORD, .op = &mode_SI_op },
473 { "__SI__", NS_KEYWORD, .op = &mode_SI_op },
474 { "DI", NS_KEYWORD, MOD_LONGLONG, .op = &mode_DI_op },
475 { "__DI__", NS_KEYWORD, MOD_LONGLONG, .op = &mode_DI_op },
476 { "TI", NS_KEYWORD, MOD_LONGLONGLONG, .op = &mode_TI_op },
477 { "__TI__", NS_KEYWORD, MOD_LONGLONGLONG, .op = &mode_TI_op },
478 { "word", NS_KEYWORD, MOD_LONG, .op = &mode_word_op },
479 { "__word__", NS_KEYWORD, MOD_LONG, .op = &mode_word_op },
480 };
481
482 const char *ignored_attributes[] = {
483 "alias",
484 "__alias__",
485 "alloc_size",
486 "__alloc_size__",
487 "always_inline",
488 "__always_inline__",
489 "bounded",
490 "__bounded__",
491 "cdecl",
492 "__cdecl__",
493 "cold",
494 "__cold__",
495 "const",
496 "__const",
497 "__const__",
498 "constructor",
499 "__constructor__",
500 "deprecated",
501 "__deprecated__",
502 "destructor",
503 "__destructor__",
504 "dllexport",
505 "__dllexport__",
506 "dllimport",
507 "__dllimport__",
508 "externally_visible",
509 "__externally_visible__",
510 "fastcall",
511 "__fastcall__",
512 "format",
513 "__format__",
514 "format_arg",
515 "__format_arg__",
516 "hot",
517 "__hot__",
518 "malloc",
519 "__malloc__",
520 "may_alias",
521 "__may_alias__",
522 "model",
523 "__model__",
524 "ms_abi",
525 "__ms_abi__",
526 "naked",
527 "__naked__",
528 "no_instrument_function",
529 "__no_instrument_function__",
530 "noinline",
531 "__noinline__",
532 "nonnull",
533 "__nonnull",
534 "__nonnull__",
535 "nothrow",
536 "__nothrow",
537 "__nothrow__",
538 "pure",
539 "__pure__",
540 "regparm",
541 "__regparm__",
542 "section",
543 "__section__",
544 "sentinel",
545 "__sentinel__",
546 "signal",
547 "__signal__",
548 "stdcall",
549 "__stdcall__",
550 "syscall_linkage",
551 "__syscall_linkage__",
552 "sysv_abi",
553 "__sysv_abi__",
554 "unused",
555 "__unused__",
556 "used",
557 "__used__",
558 "visibility",
559 "__visibility__",
560 "warn_unused_result",
561 "__warn_unused_result__",
562 "warning",
563 "__warning__",
564 "weak",
565 "__weak__",
566 };
567
568
569 void init_parser(int stream)
570 {
571 int i;
572 for (i = 0; i < ARRAY_SIZE(keyword_table); i++) {
573 struct init_keyword *ptr = keyword_table + i;
574 struct symbol *sym = create_symbol(stream, ptr->name, SYM_KEYWORD, ptr->ns);
575 sym->ident->keyword = 1;
576 if (ptr->ns == NS_TYPEDEF)
577 sym->ident->reserved = 1;
578 sym->ctype.modifiers = ptr->modifiers;
579 sym->ctype.base_type = ptr->type;
580 sym->op = ptr->op;
581 }
582
583 for (i = 0; i < ARRAY_SIZE(ignored_attributes); i++) {
584 const char * name = ignored_attributes[i];
585 struct symbol *sym = create_symbol(stream, name, SYM_KEYWORD,
586 NS_KEYWORD);
587 sym->ident->keyword = 1;
588 sym->op = &ignore_attr_op;
589 }
590 }
591
592
593 // Add a symbol to the list of function-local symbols
594 static void fn_local_symbol(struct symbol *sym)
595 {
596 if (function_symbol_list)
597 add_symbol(function_symbol_list, sym);
598 }
599
600 static int SENTINEL_ATTR match_idents(struct token *token, ...)
601 {
602 va_list args;
603 struct ident * next;
604
605 if (token_type(token) != TOKEN_IDENT)
606 return 0;
607
608 va_start(args, token);
609 do {
610 next = va_arg(args, struct ident *);
611 } while (next && token->ident != next);
612 va_end(args);
613
614 return next && token->ident == next;
615 }
616
617
618 struct statement *alloc_statement(struct position pos, int type)
619 {
620 struct statement *stmt = __alloc_statement(0);
621 stmt->type = type;
622 stmt->pos = pos;
623 return stmt;
624 }
625
626 static struct token *struct_declaration_list(struct token *token, struct symbol_list **list);
627
628 static void apply_modifiers(struct position pos, struct decl_state *ctx)
629 {
630 struct symbol *ctype;
631 if (!ctx->mode)
632 return;
633 ctype = ctx->mode->to_mode(ctx->ctype.base_type);
634 if (!ctype)
635 sparse_error(pos, "don't know how to apply mode to %s",
636 show_typename(ctx->ctype.base_type));
637 else
638 ctx->ctype.base_type = ctype;
639
640 }
641
642 static struct symbol * alloc_indirect_symbol(struct position pos, struct ctype *ctype, int type)
643 {
644 struct symbol *sym = alloc_symbol(pos, type);
645
646 sym->ctype.base_type = ctype->base_type;
647 sym->ctype.modifiers = ctype->modifiers;
648
649 ctype->base_type = sym;
650 ctype->modifiers = 0;
651 return sym;
652 }
653
654 /*
655 * NOTE! NS_LABEL is not just a different namespace,
656 * it also ends up using function scope instead of the
657 * regular symbol scope.
658 */
659 struct symbol *label_symbol(struct token *token)
660 {
661 struct symbol *sym = lookup_symbol(token->ident, NS_LABEL);
662 if (!sym) {
663 sym = alloc_symbol(token->pos, SYM_LABEL);
664 bind_symbol(sym, token->ident, NS_LABEL);
665 fn_local_symbol(sym);
666 }
667 return sym;
668 }
669
670 static struct token *struct_union_enum_specifier(enum type type,
671 struct token *token, struct decl_state *ctx,
672 struct token *(*parse)(struct token *, struct symbol *))
673 {
674 struct symbol *sym;
675 struct position *repos;
676
677 token = handle_attributes(token, ctx, KW_ATTRIBUTE);
678 if (token_type(token) == TOKEN_IDENT) {
679 sym = lookup_symbol(token->ident, NS_STRUCT);
680 if (!sym ||
681 (is_outer_scope(sym->scope) &&
682 (match_op(token->next,';') || match_op(token->next,'{')))) {
683 // Either a new symbol, or else an out-of-scope
684 // symbol being redefined.
685 sym = alloc_symbol(token->pos, type);
686 bind_symbol(sym, token->ident, NS_STRUCT);
687 }
688 if (sym->type != type)
689 error_die(token->pos, "invalid tag applied to %s", show_typename (sym));
690 ctx->ctype.base_type = sym;
691 repos = &token->pos;
692 token = token->next;
693 if (match_op(token, '{')) {
694 // The following test is actually wrong for empty
695 // structs, but (1) they are not C99, (2) gcc does
696 // the same thing, and (3) it's easier.
697 if (sym->symbol_list)
698 error_die(token->pos, "redefinition of %s", show_typename (sym));
699 sym->pos = *repos;
700 token = parse(token->next, sym);
701 token = expect(token, '}', "at end of struct-union-enum-specifier");
702
703 // Mark the structure as needing re-examination
704 sym->examined = 0;
705 sym->endpos = token->pos;
706 }
707 return token;
708 }
709
710 // private struct/union/enum type
711 if (!match_op(token, '{')) {
712 sparse_error(token->pos, "expected declaration");
713 ctx->ctype.base_type = &bad_ctype;
714 return token;
715 }
716
717 sym = alloc_symbol(token->pos, type);
718 token = parse(token->next, sym);
719 ctx->ctype.base_type = sym;
720 token = expect(token, '}', "at end of specifier");
721 sym->endpos = token->pos;
722
723 return token;
724 }
725
726 static struct token *parse_struct_declaration(struct token *token, struct symbol *sym)
727 {
728 struct symbol *field, *last = NULL;
729 struct token *res;
730 res = struct_declaration_list(token, &sym->symbol_list);
731 FOR_EACH_PTR(sym->symbol_list, field) {
732 if (!field->ident) {
733 struct symbol *base = field->ctype.base_type;
734 if (base && base->type == SYM_BITFIELD)
735 continue;
736 }
737 if (last)
738 last->next_subobject = field;
739 last = field;
740 } END_FOR_EACH_PTR(field);
741 return res;
742 }
743
744 static struct token *parse_union_declaration(struct token *token, struct symbol *sym)
745 {
746 return struct_declaration_list(token, &sym->symbol_list);
747 }
748
749 static struct token *struct_specifier(struct token *token, struct decl_state *ctx)
750 {
751 return struct_union_enum_specifier(SYM_STRUCT, token, ctx, parse_struct_declaration);
752 }
753
754 static struct token *union_specifier(struct token *token, struct decl_state *ctx)
755 {
756 return struct_union_enum_specifier(SYM_UNION, token, ctx, parse_union_declaration);
757 }
758
759
760 typedef struct {
761 int x;
762 unsigned long long y;
763 } Num;
764
765 static void upper_boundary(Num *n, Num *v)
766 {
767 if (n->x > v->x)
768 return;
769 if (n->x < v->x) {
770 *n = *v;
771 return;
772 }
773 if (n->y < v->y)
774 n->y = v->y;
775 }
776
777 static void lower_boundary(Num *n, Num *v)
778 {
779 if (n->x < v->x)
780 return;
781 if (n->x > v->x) {
782 *n = *v;
783 return;
784 }
785 if (n->y > v->y)
786 n->y = v->y;
787 }
788
789 static int type_is_ok(struct symbol *type, Num *upper, Num *lower)
790 {
791 int shift = type->bit_size;
792 int is_unsigned = type->ctype.modifiers & MOD_UNSIGNED;
793
794 if (!is_unsigned)
795 shift--;
796 if (upper->x == 0 && upper->y >> shift)
797 return 0;
798 if (lower->x == 0 || (!is_unsigned && (~lower->y >> shift) == 0))
799 return 1;
800 return 0;
801 }
802
803 static struct symbol *bigger_enum_type(struct symbol *s1, struct symbol *s2)
804 {
805 if (s1->bit_size < s2->bit_size) {
806 s1 = s2;
807 } else if (s1->bit_size == s2->bit_size) {
808 if (s2->ctype.modifiers & MOD_UNSIGNED)
809 s1 = s2;
810 }
811 if (s1->bit_size < bits_in_int)
812 return &int_ctype;
813 return s1;
814 }
815
816 static void cast_enum_list(struct symbol_list *list, struct symbol *base_type)
817 {
818 struct symbol *sym;
819
820 FOR_EACH_PTR(list, sym) {
821 struct expression *expr = sym->initializer;
822 struct symbol *ctype;
823 if (expr->type != EXPR_VALUE)
824 continue;
825 ctype = expr->ctype;
826 if (ctype->bit_size == base_type->bit_size)
827 continue;
828 cast_value(expr, base_type, expr, ctype);
829 } END_FOR_EACH_PTR(sym);
830 }
831
832 static struct token *parse_enum_declaration(struct token *token, struct symbol *parent)
833 {
834 unsigned long long lastval = 0;
835 struct symbol *ctype = NULL, *base_type = NULL;
836 Num upper = {-1, 0}, lower = {1, 0};
837
838 parent->examined = 1;
839 parent->ctype.base_type = &int_ctype;
840 while (token_type(token) == TOKEN_IDENT) {
841 struct expression *expr = NULL;
842 struct token *next = token->next;
843 struct symbol *sym;
844
845 if (match_op(next, '=')) {
846 next = constant_expression(next->next, &expr);
847 lastval = get_expression_value(expr);
848 ctype = &void_ctype;
849 if (expr && expr->ctype)
850 ctype = expr->ctype;
851 } else if (!ctype) {
852 ctype = &int_ctype;
853 } else if (is_int_type(ctype)) {
854 lastval++;
855 } else {
856 error_die(token->pos, "can't increment the last enum member");
857 }
858
859 if (!expr) {
860 expr = alloc_expression(token->pos, EXPR_VALUE);
861 expr->value = lastval;
862 expr->ctype = ctype;
863 }
864
865 sym = alloc_symbol(token->pos, SYM_NODE);
866 bind_symbol(sym, token->ident, NS_SYMBOL);
867 sym->ctype.modifiers &= ~MOD_ADDRESSABLE;
868 sym->initializer = expr;
869 sym->enum_member = 1;
870 sym->ctype.base_type = parent;
871 add_ptr_list(&parent->symbol_list, sym);
872
873 if (base_type != &bad_ctype) {
874 if (ctype->type == SYM_NODE)
875 ctype = ctype->ctype.base_type;
876 if (ctype->type == SYM_ENUM) {
877 if (ctype == parent)
878 ctype = base_type;
879 else
880 ctype = ctype->ctype.base_type;
881 }
882 /*
883 * base_type rules:
884 * - if all enums are of the same type, then
885 * the base_type is that type (two first
886 * cases)
887 * - if enums are of different types, they
888 * all have to be integer types, and the
889 * base type is at least "int_ctype".
890 * - otherwise the base_type is "bad_ctype".
891 */
892 if (!base_type) {
893 base_type = ctype;
894 } else if (ctype == base_type) {
895 /* nothing */
896 } else if (is_int_type(base_type) && is_int_type(ctype)) {
897 base_type = bigger_enum_type(base_type, ctype);
898 } else
899 base_type = &bad_ctype;
900 parent->ctype.base_type = base_type;
901 }
902 if (is_int_type(base_type)) {
903 Num v = {.y = lastval};
904 if (ctype->ctype.modifiers & MOD_UNSIGNED)
905 v.x = 0;
906 else if ((long long)lastval >= 0)
907 v.x = 0;
908 else
909 v.x = -1;
910 upper_boundary(&upper, &v);
911 lower_boundary(&lower, &v);
912 }
913 token = next;
914
915 sym->endpos = token->pos;
916
917 if (!match_op(token, ','))
918 break;
919 token = token->next;
920 }
921 if (!base_type) {
922 sparse_error(token->pos, "bad enum definition");
923 base_type = &bad_ctype;
924 }
925 else if (!is_int_type(base_type))
926 base_type = base_type;
927 else if (type_is_ok(base_type, &upper, &lower))
928 base_type = base_type;
929 else if (type_is_ok(&int_ctype, &upper, &lower))
930 base_type = &int_ctype;
931 else if (type_is_ok(&uint_ctype, &upper, &lower))
932 base_type = &uint_ctype;
933 else if (type_is_ok(&long_ctype, &upper, &lower))
934 base_type = &long_ctype;
935 else if (type_is_ok(&ulong_ctype, &upper, &lower))
936 base_type = &ulong_ctype;
937 else if (type_is_ok(&llong_ctype, &upper, &lower))
938 base_type = &llong_ctype;
939 else if (type_is_ok(&ullong_ctype, &upper, &lower))
940 base_type = &ullong_ctype;
941 else
942 base_type = &bad_ctype;
943 parent->ctype.base_type = base_type;
944 parent->ctype.modifiers |= (base_type->ctype.modifiers & MOD_UNSIGNED);
945 parent->examined = 0;
946
947 cast_enum_list(parent->symbol_list, base_type);
948
949 return token;
950 }
951
952 static struct token *enum_specifier(struct token *token, struct decl_state *ctx)
953 {
954 struct token *ret = struct_union_enum_specifier(SYM_ENUM, token, ctx, parse_enum_declaration);
955 struct ctype *ctype = &ctx->ctype.base_type->ctype;
956
957 if (!ctype->base_type)
958 ctype->base_type = &incomplete_ctype;
959
960 return ret;
961 }
962
963 static void apply_ctype(struct position pos, struct ctype *thistype, struct ctype *ctype);
964
965 static struct token *typeof_specifier(struct token *token, struct decl_state *ctx)
966 {
967 struct symbol *sym;
968
969 if (!match_op(token, '(')) {
970 sparse_error(token->pos, "expected '(' after typeof");
971 return token;
972 }
973 if (lookup_type(token->next)) {
974 token = typename(token->next, &sym, NULL);
975 ctx->ctype.base_type = sym->ctype.base_type;
976 apply_ctype(token->pos, &sym->ctype, &ctx->ctype);
977 } else {
978 struct symbol *typeof_sym = alloc_symbol(token->pos, SYM_TYPEOF);
979 token = parse_expression(token->next, &typeof_sym->initializer);
980
981 typeof_sym->endpos = token->pos;
982 if (!typeof_sym->initializer) {
983 sparse_error(token->pos, "expected expression after the '(' token");
984 typeof_sym = &bad_ctype;
985 }
986 ctx->ctype.base_type = typeof_sym;
987 }
988 return expect(token, ')', "after typeof");
989 }
990
991 static struct token *ignore_attribute(struct token *token, struct symbol *attr, struct decl_state *ctx)
992 {
993 struct expression *expr = NULL;
994 if (match_op(token, '('))
995 token = parens_expression(token, &expr, "in attribute");
996 return token;
997 }
998
999 static struct token *attribute_packed(struct token *token, struct symbol *attr, struct decl_state *ctx)
1000 {
1001 if (!ctx->ctype.alignment)
1002 ctx->ctype.alignment = 1;
1003 return token;
1004 }
1005
1006 static struct token *attribute_aligned(struct token *token, struct symbol *attr, struct decl_state *ctx)
1007 {
1008 int alignment = max_alignment;
1009 struct expression *expr = NULL;
1010
1011 if (match_op(token, '(')) {
1012 token = parens_expression(token, &expr, "in attribute");
1013 if (expr)
1014 alignment = const_expression_value(expr);
1015 }
1016 if (alignment & (alignment-1)) {
1017 warning(token->pos, "I don't like non-power-of-2 alignments");
1018 return token;
1019 } else if (alignment > ctx->ctype.alignment)
1020 ctx->ctype.alignment = alignment;
1021 return token;
1022 }
1023
1024 static void apply_qualifier(struct position *pos, struct ctype *ctx, unsigned long qual)
1025 {
1026 if (ctx->modifiers & qual)
1027 warning(*pos, "duplicate %s", modifier_string(qual));
1028 ctx->modifiers |= qual;
1029 }
1030
1031 static struct token *attribute_modifier(struct token *token, struct symbol *attr, struct decl_state *ctx)
1032 {
1033 apply_qualifier(&token->pos, &ctx->ctype, attr->ctype.modifiers);
1034 return token;
1035 }
1036
1037 static struct token *attribute_address_space(struct token *token, struct symbol *attr, struct decl_state *ctx)
1038 {
1039 struct expression *expr = NULL;
1040 int as;
1041 token = expect(token, '(', "after address_space attribute");
1042 token = conditional_expression(token, &expr);
1043 if (expr) {
1044 as = const_expression_value(expr);
1045 if (Waddress_space && as)
1046 ctx->ctype.as = as;
1047 }
1048 token = expect(token, ')', "after address_space attribute");
1049 return token;
1050 }
1051
1052 static struct symbol *to_QI_mode(struct symbol *ctype)
1053 {
1054 if (ctype->ctype.base_type != &int_type)
1055 return NULL;
1056 if (ctype == &char_ctype)
1057 return ctype;
1058 return ctype->ctype.modifiers & MOD_UNSIGNED ? &uchar_ctype
1059 : &schar_ctype;
1060 }
1061
1062 static struct symbol *to_HI_mode(struct symbol *ctype)
1063 {
1064 if (ctype->ctype.base_type != &int_type)
1065 return NULL;
1066 return ctype->ctype.modifiers & MOD_UNSIGNED ? &ushort_ctype
1067 : &sshort_ctype;
1068 }
1069
1070 static struct symbol *to_SI_mode(struct symbol *ctype)
1071 {
1072 if (ctype->ctype.base_type != &int_type)
1073 return NULL;
1074 return ctype->ctype.modifiers & MOD_UNSIGNED ? &uint_ctype
1075 : &sint_ctype;
1076 }
1077
1078 static struct symbol *to_DI_mode(struct symbol *ctype)
1079 {
1080 if (ctype->ctype.base_type != &int_type)
1081 return NULL;
1082 return ctype->ctype.modifiers & MOD_UNSIGNED ? &ullong_ctype
1083 : &sllong_ctype;
1084 }
1085
1086 static struct symbol *to_TI_mode(struct symbol *ctype)
1087 {
1088 if (ctype->ctype.base_type != &int_type)
1089 return NULL;
1090 return ctype->ctype.modifiers & MOD_UNSIGNED ? &ulllong_ctype
1091 : &slllong_ctype;
1092 }
1093
1094 static struct symbol *to_word_mode(struct symbol *ctype)
1095 {
1096 if (ctype->ctype.base_type != &int_type)
1097 return NULL;
1098 return ctype->ctype.modifiers & MOD_UNSIGNED ? &ulong_ctype
1099 : &slong_ctype;
1100 }
1101
1102 static struct token *attribute_mode(struct token *token, struct symbol *attr, struct decl_state *ctx)
1103 {
1104 token = expect(token, '(', "after mode attribute");
1105 if (token_type(token) == TOKEN_IDENT) {
1106 struct symbol *mode = lookup_keyword(token->ident, NS_KEYWORD);
1107 if (mode && mode->op->type == KW_MODE)
1108 ctx->mode = mode->op;
1109 else
1110 sparse_error(token->pos, "unknown mode attribute %s\n", show_ident(token->ident));
1111 token = token->next;
1112 } else
1113 sparse_error(token->pos, "expect attribute mode symbol\n");
1114 token = expect(token, ')', "after mode attribute");
1115 return token;
1116 }
1117
1118 static struct token *attribute_context(struct token *token, struct symbol *attr, struct decl_state *ctx)
1119 {
1120 struct context *context = alloc_context();
1121 struct expression *args[3];
1122 int argc = 0;
1123
1124 token = expect(token, '(', "after context attribute");
1125 while (!match_op(token, ')')) {
1126 struct expression *expr = NULL;
1127 token = conditional_expression(token, &expr);
1128 if (!expr)
1129 break;
1130 if (argc < 3)
1131 args[argc++] = expr;
1132 if (!match_op(token, ','))
1133 break;
1134 token = token->next;
1135 }
1136
1137 switch(argc) {
1138 case 0:
1139 sparse_error(token->pos, "expected context input/output values");
1140 break;
1141 case 1:
1142 context->in = get_expression_value(args[0]);
1143 break;
1144 case 2:
1145 context->in = get_expression_value(args[0]);
1146 context->out = get_expression_value(args[1]);
1147 break;
1148 case 3:
1149 context->context = args[0];
1150 context->in = get_expression_value(args[1]);
1151 context->out = get_expression_value(args[2]);
1152 break;
1153 }
1154
1155 if (argc)
1156 add_ptr_list(&ctx->ctype.contexts, context);
1157
1158 token = expect(token, ')', "after context attribute");
1159 return token;
1160 }
1161
1162 static struct token *attribute_designated_init(struct token *token, struct symbol *attr, struct decl_state *ctx)
1163 {
1164 if (ctx->ctype.base_type && ctx->ctype.base_type->type == SYM_STRUCT)
1165 ctx->ctype.base_type->designated_init = 1;
1166 else
1167 warning(token->pos, "attribute designated_init applied to non-structure type");
1168 return token;
1169 }
1170
1171 static struct token *attribute_transparent_union(struct token *token, struct symbol *attr, struct decl_state *ctx)
1172 {
1173 if (Wtransparent_union)
1174 warning(token->pos, "ignoring attribute __transparent_union__");
1175 return token;
1176 }
1177
1178 static struct token *recover_unknown_attribute(struct token *token)
1179 {
1180 struct expression *expr = NULL;
1181
1182 sparse_error(token->pos, "attribute '%s': unknown attribute", show_ident(token->ident));
1183 token = token->next;
1184 if (match_op(token, '('))
1185 token = parens_expression(token, &expr, "in attribute");
1186 return token;
1187 }
1188
1189 static struct token *attribute_specifier(struct token *token, struct decl_state *ctx)
1190 {
1191 token = expect(token, '(', "after attribute");
1192 token = expect(token, '(', "after attribute");
1193
1194 for (;;) {
1195 struct ident *attribute_name;
1196 struct symbol *attr;
1197
1198 if (eof_token(token))
1199 break;
1200 if (match_op(token, ';'))
1201 break;
1202 if (token_type(token) != TOKEN_IDENT)
1203 break;
1204 attribute_name = token->ident;
1205 attr = lookup_keyword(attribute_name, NS_KEYWORD);
1206 if (attr && attr->op->attribute)
1207 token = attr->op->attribute(token->next, attr, ctx);
1208 else
1209 token = recover_unknown_attribute(token);
1210
1211 if (!match_op(token, ','))
1212 break;
1213 token = token->next;
1214 }
1215
1216 token = expect(token, ')', "after attribute");
1217 token = expect(token, ')', "after attribute");
1218 return token;
1219 }
1220
1221 static const char *storage_class[] =
1222 {
1223 [STypedef] = "typedef",
1224 [SAuto] = "auto",
1225 [SExtern] = "extern",
1226 [SStatic] = "static",
1227 [SRegister] = "register",
1228 [SForced] = "[force]"
1229 };
1230
1231 static unsigned long storage_modifiers(struct decl_state *ctx)
1232 {
1233 static unsigned long mod[] =
1234 {
1235 [SAuto] = MOD_AUTO,
1236 [SExtern] = MOD_EXTERN,
1237 [SStatic] = MOD_STATIC,
1238 [SRegister] = MOD_REGISTER
1239 };
1240 return mod[ctx->storage_class] | (ctx->is_inline ? MOD_INLINE : 0)
1241 | (ctx->is_tls ? MOD_TLS : 0);
1242 }
1243
1244 static void set_storage_class(struct position *pos, struct decl_state *ctx, int class)
1245 {
1246 /* __thread can be used alone, or with extern or static */
1247 if (ctx->is_tls && (class != SStatic && class != SExtern)) {
1248 sparse_error(*pos, "__thread can only be used alone, or with "
1249 "extern or static");
1250 return;
1251 }
1252
1253 if (!ctx->storage_class) {
1254 ctx->storage_class = class;
1255 return;
1256 }
1257 if (ctx->storage_class == class)
1258 sparse_error(*pos, "duplicate %s", storage_class[class]);
1259 else
1260 sparse_error(*pos, "multiple storage classes");
1261 }
1262
1263 static struct token *typedef_specifier(struct token *next, struct decl_state *ctx)
1264 {
1265 set_storage_class(&next->pos, ctx, STypedef);
1266 return next;
1267 }
1268
1269 static struct token *auto_specifier(struct token *next, struct decl_state *ctx)
1270 {
1271 set_storage_class(&next->pos, ctx, SAuto);
1272 return next;
1273 }
1274
1275 static struct token *register_specifier(struct token *next, struct decl_state *ctx)
1276 {
1277 set_storage_class(&next->pos, ctx, SRegister);
1278 return next;
1279 }
1280
1281 static struct token *static_specifier(struct token *next, struct decl_state *ctx)
1282 {
1283 set_storage_class(&next->pos, ctx, SStatic);
1284 return next;
1285 }
1286
1287 static struct token *extern_specifier(struct token *next, struct decl_state *ctx)
1288 {
1289 set_storage_class(&next->pos, ctx, SExtern);
1290 return next;
1291 }
1292
1293 static struct token *thread_specifier(struct token *next, struct decl_state *ctx)
1294 {
1295 /* This GCC extension can be used alone, or with extern or static */
1296 if (!ctx->storage_class || ctx->storage_class == SStatic
1297 || ctx->storage_class == SExtern) {
1298 ctx->is_tls = 1;
1299 } else {
1300 sparse_error(next->pos, "__thread can only be used alone, or "
1301 "with extern or static");
1302 }
1303
1304 return next;
1305 }
1306
1307 static struct token *attribute_force(struct token *token, struct symbol *attr, struct decl_state *ctx)
1308 {
1309 set_storage_class(&token->pos, ctx, SForced);
1310 return token;
1311 }
1312
1313 static struct token *inline_specifier(struct token *next, struct decl_state *ctx)
1314 {
1315 ctx->is_inline = 1;
1316 return next;
1317 }
1318
1319 static struct token *const_qualifier(struct token *next, struct decl_state *ctx)
1320 {
1321 apply_qualifier(&next->pos, &ctx->ctype, MOD_CONST);
1322 return next;
1323 }
1324
1325 static struct token *volatile_qualifier(struct token *next, struct decl_state *ctx)
1326 {
1327 apply_qualifier(&next->pos, &ctx->ctype, MOD_VOLATILE);
1328 return next;
1329 }
1330
1331 static void apply_ctype(struct position pos, struct ctype *thistype, struct ctype *ctype)
1332 {
1333 unsigned long mod = thistype->modifiers;
1334
1335 if (mod)
1336 apply_qualifier(&pos, ctype, mod);
1337
1338 /* Context */
1339 concat_ptr_list((struct ptr_list *)thistype->contexts,
1340 (struct ptr_list **)&ctype->contexts);
1341
1342 /* Alignment */
1343 if (thistype->alignment > ctype->alignment)
1344 ctype->alignment = thistype->alignment;
1345
1346 /* Address space */
1347 if (thistype->as)
1348 ctype->as = thistype->as;
1349 }
1350
1351 static void specifier_conflict(struct position pos, int what, struct ident *new)
1352 {
1353 const char *old;
1354 if (what & (Set_S | Set_T))
1355 goto Catch_all;
1356 if (what & Set_Char)
1357 old = "char";
1358 else if (what & Set_Double)
1359 old = "double";
1360 else if (what & Set_Float)
1361 old = "float";
1362 else if (what & Set_Signed)
1363 old = "signed";
1364 else if (what & Set_Unsigned)
1365 old = "unsigned";
1366 else if (what & Set_Short)
1367 old = "short";
1368 else if (what & Set_Long)
1369 old = "long";
1370 else
1371 old = "long long";
1372 sparse_error(pos, "impossible combination of type specifiers: %s %s",
1373 old, show_ident(new));
1374 return;
1375
1376 Catch_all:
1377 sparse_error(pos, "two or more data types in declaration specifiers");
1378 }
1379
1380 static struct symbol * const int_types[] =
1381 {&short_ctype, &int_ctype, &long_ctype, &llong_ctype};
1382 static struct symbol * const signed_types[] =
1383 {&sshort_ctype, &sint_ctype, &slong_ctype, &sllong_ctype,
1384 &slllong_ctype};
1385 static struct symbol * const unsigned_types[] =
1386 {&ushort_ctype, &uint_ctype, &ulong_ctype, &ullong_ctype,
1387 &ulllong_ctype};
1388 static struct symbol * const real_types[] =
1389 {&float_ctype, &double_ctype, &ldouble_ctype};
1390 static struct symbol * const char_types[] =
1391 {&char_ctype, &schar_ctype, &uchar_ctype};
1392 static struct symbol * const * const types[] = {
1393 int_types + 1, signed_types + 1, unsigned_types + 1,
1394 real_types + 1, char_types, char_types + 1, char_types + 2
1395 };
1396
1397 struct symbol *ctype_integer(int size, int want_unsigned)
1398 {
1399 return types[want_unsigned ? CUInt : CInt][size];
1400 }
1401
1402 static struct token *handle_qualifiers(struct token *t, struct decl_state *ctx)
1403 {
1404 while (token_type(t) == TOKEN_IDENT) {
1405 struct symbol *s = lookup_symbol(t->ident, NS_TYPEDEF);
1406 if (!s)
1407 break;
1408 if (s->type != SYM_KEYWORD)
1409 break;
1410 if (!(s->op->type & (KW_ATTRIBUTE | KW_QUALIFIER)))
1411 break;
1412 t = t->next;
1413 if (s->op->declarator)
1414 t = s->op->declarator(t, ctx);
1415 }
1416 return t;
1417 }
1418
1419 static struct token *declaration_specifiers(struct token *token, struct decl_state *ctx)
1420 {
1421 int seen = 0;
1422 int class = CInt;
1423 int size = 0;
1424
1425 while (token_type(token) == TOKEN_IDENT) {
1426 struct symbol *s = lookup_symbol(token->ident,
1427 NS_TYPEDEF | NS_SYMBOL);
1428 if (!s || !(s->namespace & NS_TYPEDEF))
1429 break;
1430 if (s->type != SYM_KEYWORD) {
1431 if (seen & Set_Any)
1432 break;
1433 seen |= Set_S | Set_T;
1434 ctx->ctype.base_type = s->ctype.base_type;
1435 apply_ctype(token->pos, &s->ctype, &ctx->ctype);
1436 token = token->next;
1437 continue;
1438 }
1439 if (s->op->type & KW_SPECIFIER) {
1440 if (seen & s->op->test) {
1441 specifier_conflict(token->pos,
1442 seen & s->op->test,
1443 token->ident);
1444 break;
1445 }
1446 seen |= s->op->set;
1447 class += s->op->class;
1448 if (s->op->type & KW_SHORT) {
1449 size = -1;
1450 } else if (s->op->type & KW_LONG && size++) {
1451 if (class == CReal) {
1452 specifier_conflict(token->pos,
1453 Set_Vlong,
1454 &double_ident);
1455 break;
1456 }
1457 seen |= Set_Vlong;
1458 }
1459 }
1460 token = token->next;
1461 if (s->op->declarator)
1462 token = s->op->declarator(token, ctx);
1463 if (s->op->type & KW_EXACT) {
1464 ctx->ctype.base_type = s->ctype.base_type;
1465 ctx->ctype.modifiers |= s->ctype.modifiers;
1466 }
1467 }
1468
1469 if (!(seen & Set_S)) { /* not set explicitly? */
1470 struct symbol *base = &incomplete_ctype;
1471 if (seen & Set_Any)
1472 base = types[class][size];
1473 ctx->ctype.base_type = base;
1474 }
1475
1476 if (ctx->ctype.modifiers & MOD_BITWISE) {
1477 struct symbol *type;
1478 ctx->ctype.modifiers &= ~MOD_BITWISE;
1479 if (!is_int_type(ctx->ctype.base_type)) {
1480 sparse_error(token->pos, "invalid modifier");
1481 return token;
1482 }
1483 type = alloc_symbol(token->pos, SYM_BASETYPE);
1484 *type = *ctx->ctype.base_type;
1485 type->ctype.modifiers &= ~MOD_SPECIFIER;
1486 type->ctype.base_type = ctx->ctype.base_type;
1487 type->type = SYM_RESTRICT;
1488 ctx->ctype.base_type = type;
1489 create_fouled(type);
1490 }
1491 return token;
1492 }
1493
1494 static struct token *abstract_array_declarator(struct token *token, struct symbol *sym)
1495 {
1496 struct expression *expr = NULL;
1497
1498 if (match_idents(token, &restrict_ident, &__restrict_ident, NULL))
1499 token = token->next;
1500 token = parse_expression(token, &expr);
1501 sym->array_size = expr;
1502 return token;
1503 }
1504
1505 static struct token *parameter_type_list(struct token *, struct symbol *);
1506 static struct token *identifier_list(struct token *, struct symbol *);
1507 static struct token *declarator(struct token *token, struct decl_state *ctx);
1508
1509 static struct token *skip_attribute(struct token *token)
1510 {
1511 token = token->next;
1512 if (match_op(token, '(')) {
1513 int depth = 1;
1514 token = token->next;
1515 while (depth && !eof_token(token)) {
1516 if (token_type(token) == TOKEN_SPECIAL) {
1517 if (token->special == '(')
1518 depth++;
1519 else if (token->special == ')')
1520 depth--;
1521 }
1522 token = token->next;
1523 }
1524 }
1525 return token;
1526 }
1527
1528 static struct token *skip_attributes(struct token *token)
1529 {
1530 struct symbol *keyword;
1531 for (;;) {
1532 if (token_type(token) != TOKEN_IDENT)
1533 break;
1534 keyword = lookup_keyword(token->ident, NS_KEYWORD | NS_TYPEDEF);
1535 if (!keyword || keyword->type != SYM_KEYWORD)
1536 break;
1537 if (!(keyword->op->type & KW_ATTRIBUTE))
1538 break;
1539 token = expect(token->next, '(', "after attribute");
1540 token = expect(token, '(', "after attribute");
1541 for (;;) {
1542 if (eof_token(token))
1543 break;
1544 if (match_op(token, ';'))
1545 break;
1546 if (token_type(token) != TOKEN_IDENT)
1547 break;
1548 token = skip_attribute(token);
1549 if (!match_op(token, ','))
1550 break;
1551 token = token->next;
1552 }
1553 token = expect(token, ')', "after attribute");
1554 token = expect(token, ')', "after attribute");
1555 }
1556 return token;
1557 }
1558
1559 static struct token *handle_attributes(struct token *token, struct decl_state *ctx, unsigned int keywords)
1560 {
1561 struct symbol *keyword;
1562 for (;;) {
1563 if (token_type(token) != TOKEN_IDENT)
1564 break;
1565 keyword = lookup_keyword(token->ident, NS_KEYWORD | NS_TYPEDEF);
1566 if (!keyword || keyword->type != SYM_KEYWORD)
1567 break;
1568 if (!(keyword->op->type & keywords))
1569 break;
1570 token = keyword->op->declarator(token->next, ctx);
1571 keywords &= KW_ATTRIBUTE;
1572 }
1573 return token;
1574 }
1575
1576 static int is_nested(struct token *token, struct token **p,
1577 int prefer_abstract)
1578 {
1579 /*
1580 * This can be either a parameter list or a grouping.
1581 * For the direct (non-abstract) case, we know if must be
1582 * a parameter list if we already saw the identifier.
1583 * For the abstract case, we know if must be a parameter
1584 * list if it is empty or starts with a type.
1585 */
1586 struct token *next = token->next;
1587
1588 *p = next = skip_attributes(next);
1589
1590 if (token_type(next) == TOKEN_IDENT) {
1591 if (lookup_type(next))
1592 return !prefer_abstract;
1593 return 1;
1594 }
1595
1596 if (match_op(next, ')') || match_op(next, SPECIAL_ELLIPSIS))
1597 return 0;
1598
1599 return 1;
1600 }
1601
1602 enum kind {
1603 Empty, K_R, Proto, Bad_Func,
1604 };
1605
1606 static enum kind which_func(struct token *token,
1607 struct ident **n,
1608 int prefer_abstract)
1609 {
1610 struct token *next = token->next;
1611
1612 if (token_type(next) == TOKEN_IDENT) {
1613 if (lookup_type(next))
1614 return Proto;
1615 /* identifier list not in definition; complain */
1616 if (prefer_abstract)
1617 warning(token->pos,
1618 "identifier list not in definition");
1619 return K_R;
1620 }
1621
1622 if (token_type(next) != TOKEN_SPECIAL)
1623 return Bad_Func;
1624
1625 if (next->special == ')') {
1626 /* don't complain about those */
1627 if (!n || match_op(next->next, ';'))
1628 return Empty;
1629 warning(next->pos,
1630 "non-ANSI function declaration of function '%s'",
1631 show_ident(*n));
1632 return Empty;
1633 }
1634
1635 if (next->special == SPECIAL_ELLIPSIS) {
1636 warning(next->pos,
1637 "variadic functions must have one named argument");
1638 return Proto;
1639 }
1640
1641 return Bad_Func;
1642 }
1643
1644 static struct token *direct_declarator(struct token *token, struct decl_state *ctx)
1645 {
1646 struct ctype *ctype = &ctx->ctype;
1647 struct token *next;
1648 struct ident **p = ctx->ident;
1649
1650 if (ctx->ident && token_type(token) == TOKEN_IDENT) {
1651 *ctx->ident = token->ident;
1652 token = token->next;
1653 } else if (match_op(token, '(') &&
1654 is_nested(token, &next, ctx->prefer_abstract)) {
1655 struct symbol *base_type = ctype->base_type;
1656 if (token->next != next)
1657 next = handle_attributes(token->next, ctx,
1658 KW_ATTRIBUTE);
1659 token = declarator(next, ctx);
1660 token = expect(token, ')', "in nested declarator");
1661 while (ctype->base_type != base_type)
1662 ctype = &ctype->base_type->ctype;
1663 p = NULL;
1664 }
1665
1666 if (match_op(token, '(')) {
1667 enum kind kind = which_func(token, p, ctx->prefer_abstract);
1668 struct symbol *fn;
1669 fn = alloc_indirect_symbol(token->pos, ctype, SYM_FN);
1670 token = token->next;
1671 if (kind == K_R)
1672 token = identifier_list(token, fn);
1673 else if (kind == Proto)
1674 token = parameter_type_list(token, fn);
1675 token = expect(token, ')', "in function declarator");
1676 fn->endpos = token->pos;
1677 return token;
1678 }
1679
1680 while (match_op(token, '[')) {
1681 struct symbol *array;
1682 array = alloc_indirect_symbol(token->pos, ctype, SYM_ARRAY);
1683 token = abstract_array_declarator(token->next, array);
1684 token = expect(token, ']', "in abstract_array_declarator");
1685 array->endpos = token->pos;
1686 ctype = &array->ctype;
1687 }
1688 return token;
1689 }
1690
1691 static struct token *pointer(struct token *token, struct decl_state *ctx)
1692 {
1693 while (match_op(token,'*')) {
1694 struct symbol *ptr = alloc_symbol(token->pos, SYM_PTR);
1695 ptr->ctype.modifiers = ctx->ctype.modifiers;
1696 ptr->ctype.base_type = ctx->ctype.base_type;
1697 ptr->ctype.as = ctx->ctype.as;
1698 ptr->ctype.contexts = ctx->ctype.contexts;
1699 ctx->ctype.modifiers = 0;
1700 ctx->ctype.base_type = ptr;
1701 ctx->ctype.as = 0;
1702 ctx->ctype.contexts = NULL;
1703 ctx->ctype.alignment = 0;
1704
1705 token = handle_qualifiers(token->next, ctx);
1706 ctx->ctype.base_type->endpos = token->pos;
1707 }
1708 return token;
1709 }
1710
1711 static struct token *declarator(struct token *token, struct decl_state *ctx)
1712 {
1713 token = pointer(token, ctx);
1714 return direct_declarator(token, ctx);
1715 }
1716
1717 static struct token *handle_bitfield(struct token *token, struct decl_state *ctx)
1718 {
1719 struct ctype *ctype = &ctx->ctype;
1720 struct expression *expr;
1721 struct symbol *bitfield;
1722 long long width;
1723
1724 if (ctype->base_type != &int_type && !is_int_type(ctype->base_type)) {
1725 sparse_error(token->pos, "invalid bitfield specifier for type %s.",
1726 show_typename(ctype->base_type));
1727 // Parse this to recover gracefully.
1728 return conditional_expression(token->next, &expr);
1729 }
1730
1731 bitfield = alloc_indirect_symbol(token->pos, ctype, SYM_BITFIELD);
1732 token = conditional_expression(token->next, &expr);
1733 width = const_expression_value(expr);
1734 bitfield->bit_size = width;
1735
1736 if (width < 0 || width > INT_MAX) {
1737 sparse_error(token->pos, "invalid bitfield width, %lld.", width);
1738 width = -1;
1739 } else if (*ctx->ident && width == 0) {
1740 sparse_error(token->pos, "invalid named zero-width bitfield `%s'",
1741 show_ident(*ctx->ident));
1742 width = -1;
1743 } else if (*ctx->ident) {
1744 struct symbol *base_type = bitfield->ctype.base_type;
1745 struct symbol *bitfield_type = base_type == &int_type ? bitfield : base_type;
1746 int is_signed = !(bitfield_type->ctype.modifiers & MOD_UNSIGNED);
1747 if (Wone_bit_signed_bitfield && width == 1 && is_signed) {
1748 // Valid values are either {-1;0} or {0}, depending on integer
1749 // representation. The latter makes for very efficient code...
1750 sparse_error(token->pos, "dubious one-bit signed bitfield");
1751 }
1752 if (Wdefault_bitfield_sign &&
1753 bitfield_type->type != SYM_ENUM &&
1754 !(bitfield_type->ctype.modifiers & MOD_EXPLICITLY_SIGNED) &&
1755 is_signed) {
1756 // The sign of bitfields is unspecified by default.
1757 warning(token->pos, "dubious bitfield without explicit `signed' or `unsigned'");
1758 }
1759 }
1760 bitfield->bit_size = width;
1761 bitfield->endpos = token->pos;
1762 return token;
1763 }
1764
1765 static struct token *declaration_list(struct token *token, struct symbol_list **list)
1766 {
1767 struct decl_state ctx = {.prefer_abstract = 0};
1768 struct ctype saved;
1769 unsigned long mod;
1770
1771 token = declaration_specifiers(token, &ctx);
1772 mod = storage_modifiers(&ctx);
1773 saved = ctx.ctype;
1774 for (;;) {
1775 struct symbol *decl = alloc_symbol(token->pos, SYM_NODE);
1776 ctx.ident = &decl->ident;
1777
1778 token = declarator(token, &ctx);
1779 if (match_op(token, ':'))
1780 token = handle_bitfield(token, &ctx);
1781
1782 token = handle_attributes(token, &ctx, KW_ATTRIBUTE);
1783 apply_modifiers(token->pos, &ctx);
1784
1785 decl->ctype = ctx.ctype;
1786 decl->ctype.modifiers |= mod;
1787 decl->endpos = token->pos;
1788 add_symbol(list, decl);
1789 if (!match_op(token, ','))
1790 break;
1791 token = token->next;
1792 ctx.ctype = saved;
1793 }
1794 return token;
1795 }
1796
1797 static struct token *struct_declaration_list(struct token *token, struct symbol_list **list)
1798 {
1799 while (!match_op(token, '}')) {
1800 if (!match_op(token, ';'))
1801 token = declaration_list(token, list);
1802 if (!match_op(token, ';')) {
1803 sparse_error(token->pos, "expected ; at end of declaration");
1804 break;
1805 }
1806 token = token->next;
1807 }
1808 return token;
1809 }
1810
1811 static struct token *parameter_declaration(struct token *token, struct symbol *sym)
1812 {
1813 struct decl_state ctx = {.prefer_abstract = 1};
1814
1815 token = declaration_specifiers(token, &ctx);
1816 ctx.ident = &sym->ident;
1817 token = declarator(token, &ctx);
1818 token = handle_attributes(token, &ctx, KW_ATTRIBUTE);
1819 apply_modifiers(token->pos, &ctx);
1820 sym->ctype = ctx.ctype;
1821 sym->ctype.modifiers |= storage_modifiers(&ctx);
1822 sym->endpos = token->pos;
1823 return token;
1824 }
1825
1826 struct token *typename(struct token *token, struct symbol **p, int *forced)
1827 {
1828 struct decl_state ctx = {.prefer_abstract = 1};
1829 int class;
1830 struct symbol *sym = alloc_symbol(token->pos, SYM_NODE);
1831 *p = sym;
1832 token = declaration_specifiers(token, &ctx);
1833 token = declarator(token, &ctx);
1834 apply_modifiers(token->pos, &ctx);
1835 sym->ctype = ctx.ctype;
1836 sym->endpos = token->pos;
1837 class = ctx.storage_class;
1838 if (forced) {
1839 *forced = 0;
1840 if (class == SForced) {
1841 *forced = 1;
1842 class = 0;
1843 }
1844 }
1845 if (class)
1846 warning(sym->pos, "storage class in typename (%s %s)",
1847 storage_class[class], show_typename(sym));
1848 return token;
1849 }
1850
1851 static struct token *expression_statement(struct token *token, struct expression **tree)
1852 {
1853 token = parse_expression(token, tree);
1854 return expect(token, ';', "at end of statement");
1855 }
1856
1857 static struct token *parse_asm_operands(struct token *token, struct statement *stmt,
1858 struct expression_list **inout)
1859 {
1860 struct expression *expr;
1861
1862 /* Allow empty operands */
1863 if (match_op(token->next, ':') || match_op(token->next, ')'))
1864 return token->next;
1865 do {
1866 struct ident *ident = NULL;
1867 if (match_op(token->next, '[') &&
1868 token_type(token->next->next) == TOKEN_IDENT &&
1869 match_op(token->next->next->next, ']')) {
1870 ident = token->next->next->ident;
1871 token = token->next->next->next;
1872 }
1873 add_expression(inout, (struct expression *)ident); /* UGGLEE!!! */
1874 token = primary_expression(token->next, &expr);
1875 add_expression(inout, expr);
1876 token = parens_expression(token, &expr, "in asm parameter");
1877 add_expression(inout, expr);
1878 } while (match_op(token, ','));
1879 return token;
1880 }
1881
1882 static struct token *parse_asm_clobbers(struct token *token, struct statement *stmt,
1883 struct expression_list **clobbers)
1884 {
1885 struct expression *expr;
1886
1887 do {
1888 token = primary_expression(token->next, &expr);
1889 add_expression(clobbers, expr);
1890 } while (match_op(token, ','));
1891 return token;
1892 }
1893
1894 static struct token *parse_asm_labels(struct token *token, struct statement *stmt,
1895 struct symbol_list **labels)
1896 {
1897 struct symbol *label;
1898
1899 do {
1900 token = token->next; /* skip ':' and ',' */
1901 if (token_type(token) != TOKEN_IDENT)
1902 return token;
1903 label = label_symbol(token);
1904 add_symbol(labels, label);
1905 token = token->next;
1906 } while (match_op(token, ','));
1907 return token;
1908 }
1909
1910 static struct token *parse_asm_statement(struct token *token, struct statement *stmt)
1911 {
1912 int is_goto = 0;
1913
1914 token = token->next;
1915 stmt->type = STMT_ASM;
1916 if (match_idents(token, &__volatile___ident, &__volatile_ident, &volatile_ident, NULL)) {
1917 token = token->next;
1918 }
1919 if (token_type(token) == TOKEN_IDENT && token->ident == &goto_ident) {
1920 is_goto = 1;
1921 token = token->next;
1922 }
1923 token = expect(token, '(', "after asm");
1924 token = parse_expression(token, &stmt->asm_string);
1925 if (match_op(token, ':'))
1926 token = parse_asm_operands(token, stmt, &stmt->asm_outputs);
1927 if (match_op(token, ':'))
1928 token = parse_asm_operands(token, stmt, &stmt->asm_inputs);
1929 if (match_op(token, ':'))
1930 token = parse_asm_clobbers(token, stmt, &stmt->asm_clobbers);
1931 if (is_goto && match_op(token, ':'))
1932 token = parse_asm_labels(token, stmt, &stmt->asm_labels);
1933 token = expect(token, ')', "after asm");
1934 return expect(token, ';', "at end of asm-statement");
1935 }
1936
1937 static struct token *parse_asm_declarator(struct token *token, struct decl_state *ctx)
1938 {
1939 struct expression *expr;
1940 token = expect(token, '(', "after asm");
1941 token = parse_expression(token->next, &expr);
1942 token = expect(token, ')', "after asm");
1943 return token;
1944 }
1945
1946 /* Make a statement out of an expression */
1947 static struct statement *make_statement(struct expression *expr)
1948 {
1949 struct statement *stmt;
1950
1951 if (!expr)
1952 return NULL;
1953 stmt = alloc_statement(expr->pos, STMT_EXPRESSION);
1954 stmt->expression = expr;
1955 return stmt;
1956 }
1957
1958 /*
1959 * All iterators have two symbols associated with them:
1960 * the "continue" and "break" symbols, which are targets
1961 * for continue and break statements respectively.
1962 *
1963 * They are in a special name-space, but they follow
1964 * all the normal visibility rules, so nested iterators
1965 * automatically work right.
1966 */
1967 static void start_iterator(struct statement *stmt)
1968 {
1969 struct symbol *cont, *brk;
1970
1971 start_symbol_scope();
1972 cont = alloc_symbol(stmt->pos, SYM_NODE);
1973 bind_symbol(cont, &continue_ident, NS_ITERATOR);
1974 brk = alloc_symbol(stmt->pos, SYM_NODE);
1975 bind_symbol(brk, &break_ident, NS_ITERATOR);
1976
1977 stmt->type = STMT_ITERATOR;
1978 stmt->iterator_break = brk;
1979 stmt->iterator_continue = cont;
1980 fn_local_symbol(brk);
1981 fn_local_symbol(cont);
1982 }
1983
1984 static void end_iterator(struct statement *stmt)
1985 {
1986 end_symbol_scope();
1987 }
1988
1989 static struct statement *start_function(struct symbol *sym)
1990 {
1991 struct symbol *ret;
1992 struct statement *stmt = alloc_statement(sym->pos, STMT_COMPOUND);
1993
1994 start_function_scope();
1995 ret = alloc_symbol(sym->pos, SYM_NODE);
1996 ret->ctype = sym->ctype.base_type->ctype;
1997 ret->ctype.modifiers &= ~(MOD_STORAGE | MOD_CONST | MOD_VOLATILE | MOD_TLS | MOD_INLINE | MOD_ADDRESSABLE | MOD_NOCAST | MOD_NODEREF | MOD_ACCESSED | MOD_TOPLEVEL);
1998 ret->ctype.modifiers |= (MOD_AUTO | MOD_REGISTER);
1999 bind_symbol(ret, &return_ident, NS_ITERATOR);
2000 stmt->ret = ret;
2001 fn_local_symbol(ret);
2002
2003 // Currently parsed symbol for __func__/__FUNCTION__/__PRETTY_FUNCTION__
2004 current_fn = sym;
2005
2006 return stmt;
2007 }
2008
2009 static void end_function(struct symbol *sym)
2010 {
2011 current_fn = NULL;
2012 end_function_scope();
2013 }
2014
2015 /*
2016 * A "switch()" statement, like an iterator, has a
2017 * the "break" symbol associated with it. It works
2018 * exactly like the iterator break - it's the target
2019 * for any break-statements in scope, and means that
2020 * "break" handling doesn't even need to know whether
2021 * it's breaking out of an iterator or a switch.
2022 *
2023 * In addition, the "case" symbol is a marker for the
2024 * case/default statements to find the switch statement
2025 * that they are associated with.
2026 */
2027 static void start_switch(struct statement *stmt)
2028 {
2029 struct symbol *brk, *switch_case;
2030
2031 start_symbol_scope();
2032 brk = alloc_symbol(stmt->pos, SYM_NODE);
2033 bind_symbol(brk, &break_ident, NS_ITERATOR);
2034
2035 switch_case = alloc_symbol(stmt->pos, SYM_NODE);
2036 bind_symbol(switch_case, &case_ident, NS_ITERATOR);
2037 switch_case->stmt = stmt;
2038
2039 stmt->type = STMT_SWITCH;
2040 stmt->switch_break = brk;
2041 stmt->switch_case = switch_case;
2042
2043 fn_local_symbol(brk);
2044 fn_local_symbol(switch_case);
2045 }
2046
2047 static void end_switch(struct statement *stmt)
2048 {
2049 if (!stmt->switch_case->symbol_list)
2050 warning(stmt->pos, "switch with no cases");
2051 end_symbol_scope();
2052 }
2053
2054 static void add_case_statement(struct statement *stmt)
2055 {
2056 struct symbol *target = lookup_symbol(&case_ident, NS_ITERATOR);
2057 struct symbol *sym;
2058
2059 if (!target) {
2060 sparse_error(stmt->pos, "not in switch scope");
2061 stmt->type = STMT_NONE;
2062 return;
2063 }
2064 sym = alloc_symbol(stmt->pos, SYM_NODE);
2065 add_symbol(&target->symbol_list, sym);
2066 sym->stmt = stmt;
2067 stmt->case_label = sym;
2068 fn_local_symbol(sym);
2069 }
2070
2071 static struct token *parse_return_statement(struct token *token, struct statement *stmt)
2072 {
2073 struct symbol *target = lookup_symbol(&return_ident, NS_ITERATOR);
2074
2075 if (!target)
2076 error_die(token->pos, "internal error: return without a function target");
2077 stmt->type = STMT_RETURN;
2078 stmt->ret_target = target;
2079 return expression_statement(token->next, &stmt->ret_value);
2080 }
2081
2082 static struct token *parse_for_statement(struct token *token, struct statement *stmt)
2083 {
2084 struct symbol_list *syms;
2085 struct expression *e1, *e2, *e3;
2086 struct statement *iterator;
2087
2088 start_iterator(stmt);
2089 token = expect(token->next, '(', "after 'for'");
2090
2091 syms = NULL;
2092 e1 = NULL;
2093 /* C99 variable declaration? */
2094 if (lookup_type(token)) {
2095 token = external_declaration(token, &syms);
2096 } else {
2097 token = parse_expression(token, &e1);
2098 token = expect(token, ';', "in 'for'");
2099 }
2100 token = parse_expression(token, &e2);
2101 token = expect(token, ';', "in 'for'");
2102 token = parse_expression(token, &e3);
2103 token = expect(token, ')', "in 'for'");
2104 token = statement(token, &iterator);
2105
2106 stmt->iterator_syms = syms;
2107 stmt->iterator_pre_statement = make_statement(e1);
2108 stmt->iterator_pre_condition = e2;
2109 stmt->iterator_post_statement = make_statement(e3);
2110 stmt->iterator_post_condition = NULL;
2111 stmt->iterator_statement = iterator;
2112 end_iterator(stmt);
2113
2114 return token;
2115 }
2116
2117 static struct token *parse_while_statement(struct token *token, struct statement *stmt)
2118 {
2119 struct expression *expr;
2120 struct statement *iterator;
2121
2122 start_iterator(stmt);
2123 token = parens_expression(token->next, &expr, "after 'while'");
2124 token = statement(token, &iterator);
2125
2126 stmt->iterator_pre_condition = expr;
2127 stmt->iterator_post_condition = NULL;
2128 stmt->iterator_statement = iterator;
2129 end_iterator(stmt);
2130
2131 return token;
2132 }
2133
2134 static struct token *parse_do_statement(struct token *token, struct statement *stmt)
2135 {
2136 struct expression *expr;
2137 struct statement *iterator;
2138
2139 start_iterator(stmt);
2140 token = statement(token->next, &iterator);
2141 if (token_type(token) == TOKEN_IDENT && token->ident == &while_ident)
2142 token = token->next;
2143 else
2144 sparse_error(token->pos, "expected 'while' after 'do'");
2145 token = parens_expression(token, &expr, "after 'do-while'");
2146
2147 stmt->iterator_post_condition = expr;
2148 stmt->iterator_statement = iterator;
2149 end_iterator(stmt);
2150
2151 if (iterator && iterator->type != STMT_COMPOUND && Wdo_while)
2152 warning(iterator->pos, "do-while statement is not a compound statement");
2153
2154 return expect(token, ';', "after statement");
2155 }
2156
2157 static struct token *parse_if_statement(struct token *token, struct statement *stmt)
2158 {
2159 stmt->type = STMT_IF;
2160 token = parens_expression(token->next, &stmt->if_conditional, "after if");
2161 token = statement(token, &stmt->if_true);
2162 if (token_type(token) != TOKEN_IDENT)
2163 return token;
2164 if (token->ident != &else_ident)
2165 return token;
2166 return statement(token->next, &stmt->if_false);
2167 }
2168
2169 static inline struct token *case_statement(struct token *token, struct statement *stmt)
2170 {
2171 stmt->type = STMT_CASE;
2172 token = expect(token, ':', "after default/case");
2173 add_case_statement(stmt);
2174 return statement(token, &stmt->case_statement);
2175 }
2176
2177 static struct token *parse_case_statement(struct token *token, struct statement *stmt)
2178 {
2179 token = parse_expression(token->next, &stmt->case_expression);
2180 if (match_op(token, SPECIAL_ELLIPSIS))
2181 token = parse_expression(token->next, &stmt->case_to);
2182 return case_statement(token, stmt);
2183 }
2184
2185 static struct token *parse_default_statement(struct token *token, struct statement *stmt)
2186 {
2187 return case_statement(token->next, stmt);
2188 }
2189
2190 static struct token *parse_loop_iterator(struct token *token, struct statement *stmt)
2191 {
2192 struct symbol *target = lookup_symbol(token->ident, NS_ITERATOR);
2193 stmt->type = STMT_GOTO;
2194 stmt->goto_label = target;
2195 if (!target)
2196 sparse_error(stmt->pos, "break/continue not in iterator scope");
2197 return expect(token->next, ';', "at end of statement");
2198 }
2199
2200 static struct token *parse_switch_statement(struct token *token, struct statement *stmt)
2201 {
2202 stmt->type = STMT_SWITCH;
2203 start_switch(stmt);
2204 token = parens_expression(token->next, &stmt->switch_expression, "after 'switch'");
2205 token = statement(token, &stmt->switch_statement);
2206 end_switch(stmt);
2207 return token;
2208 }
2209
2210 static struct token *parse_goto_statement(struct token *token, struct statement *stmt)
2211 {
2212 stmt->type = STMT_GOTO;
2213 token = token->next;
2214 if (match_op(token, '*')) {
2215 token = parse_expression(token->next, &stmt->goto_expression);
2216 add_statement(&function_computed_goto_list, stmt);
2217 } else if (token_type(token) == TOKEN_IDENT) {
2218 stmt->goto_label = label_symbol(token);
2219 token = token->next;
2220 } else {
2221 sparse_error(token->pos, "Expected identifier or goto expression");
2222 }
2223 return expect(token, ';', "at end of statement");
2224 }
2225
2226 static struct token *parse_context_statement(struct token *token, struct statement *stmt)
2227 {
2228 stmt->type = STMT_CONTEXT;
2229 token = parse_expression(token->next, &stmt->expression);
2230 if(stmt->expression->type == EXPR_PREOP
2231 && stmt->expression->op == '('
2232 && stmt->expression->unop->type == EXPR_COMMA) {
2233 struct expression *expr;
2234 expr = stmt->expression->unop;
2235 stmt->context = expr->left;
2236 stmt->expression = expr->right;
2237 }
2238 return expect(token, ';', "at end of statement");
2239 }
2240
2241 static struct token *parse_range_statement(struct token *token, struct statement *stmt)
2242 {
2243 stmt->type = STMT_RANGE;
2244 token = assignment_expression(token->next, &stmt->range_expression);
2245 token = expect(token, ',', "after range expression");
2246 token = assignment_expression(token, &stmt->range_low);
2247 token = expect(token, ',', "after low range");
2248 token = assignment_expression(token, &stmt->range_high);
2249 return expect(token, ';', "after range statement");
2250 }
2251
2252 static struct token *statement(struct token *token, struct statement **tree)
2253 {
2254 struct statement *stmt = alloc_statement(token->pos, STMT_NONE);
2255
2256 *tree = stmt;
2257 if (token_type(token) == TOKEN_IDENT) {
2258 struct symbol *s = lookup_keyword(token->ident, NS_KEYWORD);
2259 if (s && s->op->statement)
2260 return s->op->statement(token, stmt);
2261
2262 if (match_op(token->next, ':')) {
2263 stmt->type = STMT_LABEL;
2264 stmt->label_identifier = label_symbol(token);
2265 token = skip_attributes(token->next->next);
2266 return statement(token, &stmt->label_statement);
2267 }
2268 }
2269
2270 if (match_op(token, '{')) {
2271 stmt->type = STMT_COMPOUND;
2272 start_symbol_scope();
2273 token = compound_statement(token->next, stmt);
2274 end_symbol_scope();
2275
2276 return expect(token, '}', "at end of compound statement");
2277 }
2278
2279 stmt->type = STMT_EXPRESSION;
2280 return expression_statement(token, &stmt->expression);
2281 }
2282
2283 /* gcc extension - __label__ ident-list; in the beginning of compound stmt */
2284 static struct token *label_statement(struct token *token)
2285 {
2286 while (token_type(token) == TOKEN_IDENT) {
2287 struct symbol *sym = alloc_symbol(token->pos, SYM_LABEL);
2288 /* it's block-scope, but we want label namespace */
2289 bind_symbol(sym, token->ident, NS_SYMBOL);
2290 sym->namespace = NS_LABEL;
2291 fn_local_symbol(sym);
2292 token = token->next;
2293 if (!match_op(token, ','))
2294 break;
2295 token = token->next;
2296 }
2297 return expect(token, ';', "at end of label declaration");
2298 }
2299
2300 static struct token * statement_list(struct token *token, struct statement_list **list)
2301 {
2302 int seen_statement = 0;
2303 while (token_type(token) == TOKEN_IDENT &&
2304 token->ident == &__label___ident)
2305 token = label_statement(token->next);
2306 for (;;) {
2307 struct statement * stmt;
2308 if (eof_token(token))
2309 break;
2310 if (match_op(token, '}'))
2311 break;
2312 if (lookup_type(token)) {
2313 if (seen_statement) {
2314 warning(token->pos, "mixing declarations and code");
2315 seen_statement = 0;
2316 }
2317 stmt = alloc_statement(token->pos, STMT_DECLARATION);
2318 token = external_declaration(token, &stmt->declaration);
2319 } else {
2320 seen_statement = Wdeclarationafterstatement;
2321 token = statement(token, &stmt);
2322 }
2323 add_statement(list, stmt);
2324 }
2325 return token;
2326 }
2327
2328 static struct token *identifier_list(struct token *token, struct symbol *fn)
2329 {
2330 struct symbol_list **list = &fn->arguments;
2331 for (;;) {
2332 struct symbol *sym = alloc_symbol(token->pos, SYM_NODE);
2333 sym->ident = token->ident;
2334 token = token->next;
2335 sym->endpos = token->pos;
2336 sym->ctype.base_type = &incomplete_ctype;
2337 add_symbol(list, sym);
2338 if (!match_op(token, ',') ||
2339 token_type(token->next) != TOKEN_IDENT ||
2340 lookup_type(token->next))
2341 break;
2342 token = token->next;
2343 }
2344 return token;
2345 }
2346
2347 static struct token *parameter_type_list(struct token *token, struct symbol *fn)
2348 {
2349 struct symbol_list **list = &fn->arguments;
2350
2351 for (;;) {
2352 struct symbol *sym;
2353
2354 if (match_op(token, SPECIAL_ELLIPSIS)) {
2355 fn->variadic = 1;
2356 token = token->next;
2357 break;
2358 }
2359
2360 sym = alloc_symbol(token->pos, SYM_NODE);
2361 token = parameter_declaration(token, sym);
2362 if (sym->ctype.base_type == &void_ctype) {
2363 /* Special case: (void) */
2364 if (!*list && !sym->ident)
2365 break;
2366 warning(token->pos, "void parameter");
2367 }
2368 add_symbol(list, sym);
2369 if (!match_op(token, ','))
2370 break;
2371 token = token->next;
2372 }
2373 return token;
2374 }
2375
2376 struct token *compound_statement(struct token *token, struct statement *stmt)
2377 {
2378 token = statement_list(token, &stmt->stmts);
2379 return token;
2380 }
2381
2382 static struct expression *identifier_expression(struct token *token)
2383 {
2384 struct expression *expr = alloc_expression(token->pos, EXPR_IDENTIFIER);
2385 expr->expr_ident = token->ident;
2386 return expr;
2387 }
2388
2389 static struct expression *index_expression(struct expression *from, struct expression *to)
2390 {
2391 int idx_from, idx_to;
2392 struct expression *expr = alloc_expression(from->pos, EXPR_INDEX);
2393
2394 idx_from = const_expression_value(from);
2395 idx_to = idx_from;
2396 if (to) {
2397 idx_to = const_expression_value(to);
2398 if (idx_to < idx_from || idx_from < 0)
2399 warning(from->pos, "nonsense array initializer index range");
2400 }
2401 expr->idx_from = idx_from;
2402 expr->idx_to = idx_to;
2403 return expr;
2404 }
2405
2406 static struct token *single_initializer(struct expression **ep, struct token *token)
2407 {
2408 int expect_equal = 0;
2409 struct token *next = token->next;
2410 struct expression **tail = ep;
2411 int nested;
2412
2413 *ep = NULL;
2414
2415 if ((token_type(token) == TOKEN_IDENT) && match_op(next, ':')) {
2416 struct expression *expr = identifier_expression(token);
2417 if (Wold_initializer)
2418 warning(token->pos, "obsolete struct initializer, use C99 syntax");
2419 token = initializer(&expr->ident_expression, next->next);
2420 if (expr->ident_expression)
2421 *ep = expr;
2422 return token;
2423 }
2424
2425 for (tail = ep, nested = 0; ; nested++, next = token->next) {
2426 if (match_op(token, '.') && (token_type(next) == TOKEN_IDENT)) {
2427 struct expression *expr = identifier_expression(next);
2428 *tail = expr;
2429 tail = &expr->ident_expression;
2430 expect_equal = 1;
2431 token = next->next;
2432 } else if (match_op(token, '[')) {
2433 struct expression *from = NULL, *to = NULL, *expr;
2434 token = constant_expression(token->next, &from);
2435 if (!from) {
2436 sparse_error(token->pos, "Expected constant expression");
2437 break;
2438 }
2439 if (match_op(token, SPECIAL_ELLIPSIS))
2440 token = constant_expression(token->next, &to);
2441 expr = index_expression(from, to);
2442 *tail = expr;
2443 tail = &expr->idx_expression;
2444 token = expect(token, ']', "at end of initializer index");
2445 if (nested)
2446 expect_equal = 1;
2447 } else {
2448 break;
2449 }
2450 }
2451 if (nested && !expect_equal) {
2452 if (!match_op(token, '='))
2453 warning(token->pos, "obsolete array initializer, use C99 syntax");
2454 else
2455 expect_equal = 1;
2456 }
2457 if (expect_equal)
2458 token = expect(token, '=', "at end of initializer index");
2459
2460 token = initializer(tail, token);
2461 if (!*tail)
2462 *ep = NULL;
2463 return token;
2464 }
2465
2466 static struct token *initializer_list(struct expression_list **list, struct token *token)
2467 {
2468 struct expression *expr;
2469
2470 for (;;) {
2471 token = single_initializer(&expr, token);
2472 if (!expr)
2473 break;
2474 add_expression(list, expr);
2475 if (!match_op(token, ','))
2476 break;
2477 token = token->next;
2478 }
2479 return token;
2480 }
2481
2482 struct token *initializer(struct expression **tree, struct token *token)
2483 {
2484 if (match_op(token, '{')) {
2485 struct expression *expr = alloc_expression(token->pos, EXPR_INITIALIZER);
2486 *tree = expr;
2487 token = initializer_list(&expr->expr_list, token->next);
2488 return expect(token, '}', "at end of initializer");
2489 }
2490 return assignment_expression(token, tree);
2491 }
2492
2493 static void declare_argument(struct symbol *sym, struct symbol *fn)
2494 {
2495 if (!sym->ident) {
2496 sparse_error(sym->pos, "no identifier for function argument");
2497 return;
2498 }
2499 bind_symbol(sym, sym->ident, NS_SYMBOL);
2500 }
2501
2502 static struct token *parse_function_body(struct token *token, struct symbol *decl,
2503 struct symbol_list **list)
2504 {
2505 struct symbol_list **old_symbol_list;
2506 struct symbol *base_type = decl->ctype.base_type;
2507 struct statement *stmt, **p;
2508 struct symbol *prev;
2509 struct symbol *arg;
2510
2511 old_symbol_list = function_symbol_list;
2512 if (decl->ctype.modifiers & MOD_INLINE) {
2513 function_symbol_list = &decl->inline_symbol_list;
2514 p = &base_type->inline_stmt;
2515 } else {
2516 function_symbol_list = &decl->symbol_list;
2517 p = &base_type->stmt;
2518 }
2519 function_computed_target_list = NULL;
2520 function_computed_goto_list = NULL;
2521
2522 if (decl->ctype.modifiers & MOD_EXTERN) {
2523 if (!(decl->ctype.modifiers & MOD_INLINE))
2524 warning(decl->pos, "function '%s' with external linkage has definition", show_ident(decl->ident));
2525 }
2526 if (!(decl->ctype.modifiers & MOD_STATIC))
2527 decl->ctype.modifiers |= MOD_EXTERN;
2528
2529 stmt = start_function(decl);
2530
2531 *p = stmt;
2532 FOR_EACH_PTR (base_type->arguments, arg) {
2533 declare_argument(arg, base_type);
2534 } END_FOR_EACH_PTR(arg);
2535
2536 token = compound_statement(token->next, stmt);
2537
2538 end_function(decl);
2539 if (!(decl->ctype.modifiers & MOD_INLINE))
2540 add_symbol(list, decl);
2541 check_declaration(decl);
2542 decl->definition = decl;
2543 prev = decl->same_symbol;
2544 if (prev && prev->definition) {
2545 warning(decl->pos, "multiple definitions for function '%s'",
2546 show_ident(decl->ident));
2547 info(prev->definition->pos, " the previous one is here");
2548 } else {
2549 while (prev) {
2550 prev->definition = decl;
2551 prev = prev->same_symbol;
2552 }
2553 }
2554 function_symbol_list = old_symbol_list;
2555 if (function_computed_goto_list) {
2556 if (!function_computed_target_list)
2557 warning(decl->pos, "function '%s' has computed goto but no targets?", show_ident(decl->ident));
2558 else {
2559 FOR_EACH_PTR(function_computed_goto_list, stmt) {
2560 stmt->target_list = function_computed_target_list;
2561 } END_FOR_EACH_PTR(stmt);
2562 }
2563 }
2564 return expect(token, '}', "at end of function");
2565 }
2566
2567 static void promote_k_r_types(struct symbol *arg)
2568 {
2569 struct symbol *base = arg->ctype.base_type;
2570 if (base && base->ctype.base_type == &int_type && (base->ctype.modifiers & (MOD_CHAR | MOD_SHORT))) {
2571 arg->ctype.base_type = &int_ctype;
2572 }
2573 }
2574
2575 static void apply_k_r_types(struct symbol_list *argtypes, struct symbol *fn)
2576 {
2577 struct symbol_list *real_args = fn->ctype.base_type->arguments;
2578 struct symbol *arg;
2579
2580 FOR_EACH_PTR(real_args, arg) {
2581 struct symbol *type;
2582
2583 /* This is quadratic in the number of arguments. We _really_ don't care */
2584 FOR_EACH_PTR(argtypes, type) {
2585 if (type->ident == arg->ident)
2586 goto match;
2587 } END_FOR_EACH_PTR(type);
2588 sparse_error(arg->pos, "missing type declaration for parameter '%s'", show_ident(arg->ident));
2589 continue;
2590 match:
2591 type->used = 1;
2592 /* "char" and "short" promote to "int" */
2593 promote_k_r_types(type);
2594
2595 arg->ctype = type->ctype;
2596 } END_FOR_EACH_PTR(arg);
2597
2598 FOR_EACH_PTR(argtypes, arg) {
2599 if (!arg->used)
2600 warning(arg->pos, "nonsensical parameter declaration '%s'", show_ident(arg->ident));
2601 } END_FOR_EACH_PTR(arg);
2602
2603 }
2604
2605 static struct token *parse_k_r_arguments(struct token *token, struct symbol *decl,
2606 struct symbol_list **list)
2607 {
2608 struct symbol_list *args = NULL;
2609
2610 warning(token->pos, "non-ANSI definition of function '%s'", show_ident(decl->ident));
2611 do {
2612 token = declaration_list(token, &args);
2613 if (!match_op(token, ';')) {
2614 sparse_error(token->pos, "expected ';' at end of parameter declaration");
2615 break;
2616 }
2617 token = token->next;
2618 } while (lookup_type(token));
2619
2620 apply_k_r_types(args, decl);
2621
2622 if (!match_op(token, '{')) {
2623 sparse_error(token->pos, "expected function body");
2624 return token;
2625 }
2626 return parse_function_body(token, decl, list);
2627 }
2628
2629 static struct token *toplevel_asm_declaration(struct token *token, struct symbol_list **list)
2630 {
2631 struct symbol *anon = alloc_symbol(token->pos, SYM_NODE);
2632 struct symbol *fn = alloc_symbol(token->pos, SYM_FN);
2633 struct statement *stmt;
2634
2635 anon->ctype.base_type = fn;
2636 stmt = alloc_statement(token->pos, STMT_NONE);
2637 fn->stmt = stmt;
2638
2639 token = parse_asm_statement(token, stmt);
2640
2641 add_symbol(list, anon);
2642 return token;
2643 }
2644
2645 struct token *external_declaration(struct token *token, struct symbol_list **list)
2646 {
2647 struct ident *ident = NULL;
2648 struct symbol *decl;
2649 struct decl_state ctx = { .ident = &ident };
2650 struct ctype saved;
2651 struct symbol *base_type;
2652 unsigned long mod;
2653 int is_typedef;
2654
2655 /* Top-level inline asm? */
2656 if (token_type(token) == TOKEN_IDENT) {
2657 struct symbol *s = lookup_keyword(token->ident, NS_KEYWORD);
2658 if (s && s->op->toplevel)
2659 return s->op->toplevel(token, list);
2660 }
2661
2662 /* Parse declaration-specifiers, if any */
2663 token = declaration_specifiers(token, &ctx);
2664 mod = storage_modifiers(&ctx);
2665 decl = alloc_symbol(token->pos, SYM_NODE);
2666 /* Just a type declaration? */
2667 if (match_op(token, ';')) {
2668 apply_modifiers(token->pos, &ctx);
2669 return token->next;
2670 }
2671
2672 saved = ctx.ctype;
2673 token = declarator(token, &ctx);
2674 token = handle_attributes(token, &ctx, KW_ATTRIBUTE | KW_ASM);
2675 apply_modifiers(token->pos, &ctx);
2676
2677 decl->ctype = ctx.ctype;
2678 decl->ctype.modifiers |= mod;
2679 decl->endpos = token->pos;
2680
2681 /* Just a type declaration? */
2682 if (!ident) {
2683 warning(token->pos, "missing identifier in declaration");
2684 return expect(token, ';', "at the end of type declaration");
2685 }
2686
2687 /* type define declaration? */
2688 is_typedef = ctx.storage_class == STypedef;
2689
2690 /* Typedefs don't have meaningful storage */
2691 if (is_typedef)
2692 decl->ctype.modifiers |= MOD_USERTYPE;
2693
2694 bind_symbol(decl, ident, is_typedef ? NS_TYPEDEF: NS_SYMBOL);
2695
2696 base_type = decl->ctype.base_type;
2697
2698 if (is_typedef) {
2699 if (base_type && !base_type->ident) {
2700 switch (base_type->type) {
2701 case SYM_STRUCT:
2702 case SYM_UNION:
2703 case SYM_ENUM:
2704 case SYM_RESTRICT:
2705 base_type->ident = ident;
2706 }
2707 }
2708 } else if (base_type && base_type->type == SYM_FN) {
2709 /* K&R argument declaration? */
2710 if (lookup_type(token))
2711 return parse_k_r_arguments(token, decl, list);
2712 if (match_op(token, '{'))
2713 return parse_function_body(token, decl, list);
2714
2715 if (!(decl->ctype.modifiers & MOD_STATIC))
2716 decl->ctype.modifiers |= MOD_EXTERN;
2717 } else if (base_type == &void_ctype && !(decl->ctype.modifiers & MOD_EXTERN)) {
2718 sparse_error(token->pos, "void declaration");
2719 }
2720
2721 for (;;) {
2722 if (!is_typedef && match_op(token, '=')) {
2723 if (decl->ctype.modifiers & MOD_EXTERN) {
2724 warning(decl->pos, "symbol with external linkage has initializer");
2725 decl->ctype.modifiers &= ~MOD_EXTERN;
2726 }
2727 token = initializer(&decl->initializer, token->next);
2728 }
2729 if (!is_typedef) {
2730 if (!(decl->ctype.modifiers & (MOD_EXTERN | MOD_INLINE))) {
2731 add_symbol(list, decl);
2732 fn_local_symbol(decl);
2733 }
2734 }
2735 check_declaration(decl);
2736 if (decl->same_symbol)
2737 decl->definition = decl->same_symbol->definition;
2738
2739 if (!match_op(token, ','))
2740 break;
2741
2742 token = token->next;
2743 ident = NULL;
2744 decl = alloc_symbol(token->pos, SYM_NODE);
2745 ctx.ctype = saved;
2746 token = handle_attributes(token, &ctx, KW_ATTRIBUTE);
2747 token = declarator(token, &ctx);
2748 token = handle_attributes(token, &ctx, KW_ATTRIBUTE | KW_ASM);
2749 apply_modifiers(token->pos, &ctx);
2750 decl->ctype = ctx.ctype;
2751 decl->ctype.modifiers |= mod;
2752 decl->endpos = token->pos;
2753 if (!ident) {
2754 sparse_error(token->pos, "expected identifier name in type definition");
2755 return token;
2756 }
2757
2758 if (is_typedef)
2759 decl->ctype.modifiers |= MOD_USERTYPE;
2760
2761 bind_symbol(decl, ident, is_typedef ? NS_TYPEDEF: NS_SYMBOL);
2762
2763 /* Function declarations are automatically extern unless specifically static */
2764 base_type = decl->ctype.base_type;
2765 if (!is_typedef && base_type && base_type->type == SYM_FN) {
2766 if (!(decl->ctype.modifiers & MOD_STATIC))
2767 decl->ctype.modifiers |= MOD_EXTERN;
2768 }
2769 }
2770 return expect(token, ';', "at end of declaration");
2771 }
Static analysis for C