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Avoid bogus gcc warnings about unused results
[smatch.git] / parse.c
blobc536ec2deefc2360ddbf0edce24a0cbe9ebe123c
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 *
9 * Licensed under the Open Software License version 1.1
10 */
11
12 #include <stdarg.h>
13 #include <stdlib.h>
14 #include <stdio.h>
15 #include <string.h>
16 #include <ctype.h>
17 #include <unistd.h>
18 #include <fcntl.h>
19 #include <limits.h>
20
21 #include "lib.h"
22 #include "allocate.h"
23 #include "token.h"
24 #include "parse.h"
25 #include "symbol.h"
26 #include "scope.h"
27 #include "expression.h"
28 #include "target.h"
29
30 #define warn_on_mixed (1)
31
32 static struct symbol_list **function_symbol_list;
33 struct symbol_list *function_computed_target_list;
34 struct statement_list *function_computed_goto_list;
35
36 static struct token *statement(struct token *token, struct statement **tree);
37
38 // Add a symbol to the list of function-local symbols
39 static void fn_local_symbol(struct symbol *sym)
40 {
41 if (function_symbol_list)
42 add_symbol(function_symbol_list, sym);
43 }
44
45 static int match_idents(struct token *token, ...)
46 {
47 va_list args;
48
49 if (token_type(token) != TOKEN_IDENT)
50 return 0;
51
52 va_start(args, token);
53 for (;;) {
54 struct ident * next = va_arg(args, struct ident *);
55 if (!next)
56 return 0;
57 if (token->ident == next)
58 return 1;
59 }
60 }
61
62
63 struct statement *alloc_statement(struct position pos, int type)
64 {
65 struct statement *stmt = __alloc_statement(0);
66 stmt->type = type;
67 stmt->pos = pos;
68 return stmt;
69 }
70
71 static struct token *struct_declaration_list(struct token *token, struct symbol_list **list);
72
73 static struct symbol * indirect(struct position pos, struct ctype *ctype, int type)
74 {
75 struct symbol *sym = alloc_symbol(pos, type);
76
77 sym->ctype.base_type = ctype->base_type;
78 sym->ctype.modifiers = ctype->modifiers & ~MOD_STORAGE;
79
80 ctype->base_type = sym;
81 ctype->modifiers &= MOD_STORAGE;
82 return sym;
83 }
84
85 static struct symbol *lookup_or_create_symbol(enum namespace ns, enum type type, struct token *token)
86 {
87 struct symbol *sym = lookup_symbol(token->ident, ns);
88 if (!sym) {
89 sym = alloc_symbol(token->pos, type);
90 bind_symbol(sym, token->ident, ns);
91 if (type == SYM_LABEL)
92 fn_local_symbol(sym);
93 }
94 return sym;
95 }
96
97 /*
98 * NOTE! NS_LABEL is not just a different namespace,
99 * it also ends up using function scope instead of the
100 * regular symbol scope.
101 */
102 struct symbol *label_symbol(struct token *token)
103 {
104 return lookup_or_create_symbol(NS_LABEL, SYM_LABEL, token);
105 }
106
107 static struct token *struct_union_enum_specifier(enum type type,
108 struct token *token, struct ctype *ctype,
109 struct token *(*parse)(struct token *, struct symbol *))
110 {
111 struct symbol *sym;
112 struct position *repos;
113
114 ctype->modifiers = 0;
115 if (token_type(token) == TOKEN_IDENT) {
116 sym = lookup_symbol(token->ident, NS_STRUCT);
117 if (!sym ||
118 (sym->scope != block_scope &&
119 (match_op(token->next,';') || match_op(token->next,'{')))) {
120 // Either a new symbol, or else an out-of-scope
121 // symbol being redefined.
122 sym = alloc_symbol(token->pos, type);
123 bind_symbol(sym, token->ident, NS_STRUCT);
124 }
125 if (sym->type != type)
126 error_die(token->pos, "invalid tag applied to %s", show_typename (sym));
127 ctype->base_type = sym;
128 repos = &token->pos;
129 token = token->next;
130 if (match_op(token, '{')) {
131 // The following test is actually wrong for empty
132 // structs, but (1) they are not C99, (2) gcc does
133 // the same thing, and (3) it's easier.
134 if (sym->symbol_list)
135 error_die(token->pos, "redefinition of %s", show_typename (sym));
136 sym->pos = *repos;
137 token = parse(token->next, sym);
138 token = expect(token, '}', "at end of struct-union-enum-specifier");
139
140 // Mark the structure as needing re-examination
141 sym->examined = 0;
142 }
143 return token;
144 }
145
146 // private struct/union/enum type
147 if (!match_op(token, '{')) {
148 sparse_error(token->pos, "expected declaration");
149 ctype->base_type = &bad_ctype;
150 return token;
151 }
152
153 sym = alloc_symbol(token->pos, type);
154 token = parse(token->next, sym);
155 ctype->base_type = sym;
156 return expect(token, '}', "at end of specifier");
157 }
158
159 static struct token *parse_struct_declaration(struct token *token, struct symbol *sym)
160 {
161 return struct_declaration_list(token, &sym->symbol_list);
162 }
163
164 static struct token *struct_or_union_specifier(enum type type, struct token *token, struct ctype *ctype)
165 {
166 return struct_union_enum_specifier(type, token, ctype, parse_struct_declaration);
167 }
168
169 typedef struct {
170 int x;
171 unsigned long long y;
172 } Num;
173
174 static void upper_boundary(Num *n, Num *v)
175 {
176 if (n->x > v->x)
177 return;
178 if (n->x < v->x) {
179 *n = *v;
180 return;
181 }
182 if (n->y < v->y)
183 n->y = v->y;
184 }
185
186 static void lower_boundary(Num *n, Num *v)
187 {
188 if (n->x < v->x)
189 return;
190 if (n->x > v->x) {
191 *n = *v;
192 return;
193 }
194 if (n->y > v->y)
195 n->y = v->y;
196 }
197
198 static int type_is_ok(struct symbol *type, Num *upper, Num *lower)
199 {
200 int shift = type->bit_size;
201 int is_unsigned = type->ctype.modifiers & MOD_UNSIGNED;
202
203 if (!is_unsigned)
204 shift--;
205 if (upper->x == 0 && upper->y >> shift)
206 return 0;
207 if (lower->x == 0 || (!is_unsigned && (~lower->y >> shift) == 0))
208 return 1;
209 return 0;
210 }
211
212 static struct symbol *bigger_enum_type(struct symbol *s1, struct symbol *s2)
213 {
214 if (s1->bit_size < s2->bit_size) {
215 s1 = s2;
216 } else if (s1->bit_size == s2->bit_size) {
217 if (s2->ctype.modifiers & MOD_UNSIGNED)
218 s1 = s2;
219 }
220 if (s1->bit_size < bits_in_int)
221 return &int_ctype;
222 return s1;
223 }
224
225 static void cast_enum_list(struct symbol_list *list, struct symbol *base_type)
226 {
227 struct symbol *sym;
228
229 FOR_EACH_PTR(list, sym) {
230 struct expression *expr = sym->initializer;
231 struct symbol *ctype;
232 if (expr->type != EXPR_VALUE)
233 continue;
234 ctype = expr->ctype;
235 if (ctype->bit_size == base_type->bit_size)
236 continue;
237 cast_value(expr, base_type, expr, ctype);
238 } END_FOR_EACH_PTR(sym);
239 }
240
241 static struct token *parse_enum_declaration(struct token *token, struct symbol *parent)
242 {
243 unsigned long long lastval = 0;
244 struct symbol *ctype = NULL, *base_type = NULL;
245 Num upper = {-1, 0}, lower = {1, 0};
246 struct symbol_list *entries = NULL;
247
248 parent->examined = 1;
249 parent->ctype.base_type = &int_ctype;
250 while (token_type(token) == TOKEN_IDENT) {
251 struct expression *expr = NULL;
252 struct token *next = token->next;
253 struct symbol *sym;
254
255 sym = alloc_symbol(token->pos, SYM_NODE);
256 bind_symbol(sym, token->ident, NS_SYMBOL);
257 sym->ctype.modifiers &= ~MOD_ADDRESSABLE;
258
259 if (match_op(next, '=')) {
260 next = constant_expression(next->next, &expr);
261 lastval = get_expression_value(expr);
262 ctype = &void_ctype;
263 if (expr && expr->ctype)
264 ctype = expr->ctype;
265 } else if (!ctype) {
266 ctype = &int_ctype;
267 } else if (is_int_type(ctype)) {
268 lastval++;
269 } else {
270 error_die(token->pos, "can't increment the last enum member");
271 }
272
273 if (!expr) {
274 expr = alloc_expression(token->pos, EXPR_VALUE);
275 expr->value = lastval;
276 expr->ctype = ctype;
277 }
278
279 sym->initializer = expr;
280 sym->ctype.base_type = parent;
281 add_ptr_list(&entries, sym);
282
283 if (base_type != &bad_ctype) {
284 if (ctype->type == SYM_NODE)
285 ctype = ctype->ctype.base_type;
286 if (ctype->type == SYM_ENUM) {
287 if (ctype == parent)
288 ctype = base_type;
289 else
290 ctype = ctype->ctype.base_type;
291 }
292 /*
293 * base_type rules:
294 * - if all enum's are of the same type, then
295 * the base_type is that type (two first
296 * cases)
297 * - if enums are of different types, they
298 * all have to be integer types, and the
299 * base type is at least "int_ctype".
300 * - otherwise the base_type is "bad_ctype".
301 */
302 if (!base_type) {
303 base_type = ctype;
304 } else if (ctype == base_type) {
305 /* nothing */
306 } else if (is_int_type(base_type) && is_int_type(ctype)) {
307 base_type = bigger_enum_type(base_type, ctype);
308 } else
309 base_type = &bad_ctype;
310 parent->ctype.base_type = base_type;
311 }
312 if (is_int_type(base_type)) {
313 Num v = {.y = lastval};
314 if (ctype->ctype.modifiers & MOD_UNSIGNED)
315 v.x = 0;
316 else if ((long long)lastval >= 0)
317 v.x = 0;
318 else
319 v.x = -1;
320 upper_boundary(&upper, &v);
321 lower_boundary(&lower, &v);
322 }
323 token = next;
324 if (!match_op(token, ','))
325 break;
326 token = token->next;
327 }
328 if (!base_type) {
329 sparse_error(token->pos, "bad enum definition");
330 base_type = &bad_ctype;
331 }
332 else if (!is_int_type(base_type))
333 base_type = base_type;
334 else if (type_is_ok(base_type, &upper, &lower))
335 base_type = base_type;
336 else if (type_is_ok(&int_ctype, &upper, &lower))
337 base_type = &int_ctype;
338 else if (type_is_ok(&uint_ctype, &upper, &lower))
339 base_type = &uint_ctype;
340 else if (type_is_ok(&long_ctype, &upper, &lower))
341 base_type = &long_ctype;
342 else if (type_is_ok(&ulong_ctype, &upper, &lower))
343 base_type = &ulong_ctype;
344 else if (type_is_ok(&llong_ctype, &upper, &lower))
345 base_type = &llong_ctype;
346 else if (type_is_ok(&ullong_ctype, &upper, &lower))
347 base_type = &ullong_ctype;
348 else
349 base_type = &bad_ctype;
350 parent->ctype.base_type = base_type;
351 parent->ctype.modifiers |= (base_type->ctype.modifiers & MOD_UNSIGNED);
352 parent->examined = 0;
353
354 cast_enum_list(entries, base_type);
355 free_ptr_list(&entries);
356
357 return token;
358 }
359
360 static struct token *enum_specifier(struct token *token, struct ctype *ctype)
361 {
362 struct token *ret = struct_union_enum_specifier(SYM_ENUM, token, ctype, parse_enum_declaration);
363
364 ctype = &ctype->base_type->ctype;
365 if (!ctype->base_type)
366 ctype->base_type = &incomplete_ctype;
367
368 return ret;
369 }
370
371 static struct token *typeof_specifier(struct token *token, struct ctype *ctype)
372 {
373 struct symbol *sym;
374
375 if (!match_op(token, '(')) {
376 sparse_error(token->pos, "expected '(' after typeof");
377 return token;
378 }
379 if (lookup_type(token->next)) {
380 token = typename(token->next, &sym);
381 *ctype = sym->ctype;
382 } else {
383 struct symbol *typeof_sym = alloc_symbol(token->pos, SYM_TYPEOF);
384 token = parse_expression(token->next, &typeof_sym->initializer);
385
386 ctype->modifiers = 0;
387 ctype->base_type = typeof_sym;
388 }
389 return expect(token, ')', "after typeof");
390 }
391
392 static const char * handle_attribute(struct ctype *ctype, struct ident *attribute, struct expression *expr)
393 {
394 if (attribute == &packed_ident ||
395 attribute == &__packed___ident) {
396 ctype->alignment = 1;
397 return NULL;
398 }
399 if (attribute == &aligned_ident ||
400 attribute == &__aligned___ident) {
401 int alignment = max_alignment;
402 if (expr)
403 alignment = get_expression_value(expr);
404 ctype->alignment = alignment;
405 return NULL;
406 }
407 if (attribute == &nocast_ident) {
408 ctype->modifiers |= MOD_NOCAST;
409 return NULL;
410 }
411 if (attribute == &noderef_ident) {
412 ctype->modifiers |= MOD_NODEREF;
413 return NULL;
414 }
415 if (attribute == &safe_ident) {
416 ctype->modifiers |= MOD_SAFE;
417 return NULL;
418 }
419 if (attribute == &force_ident) {
420 ctype->modifiers |= MOD_FORCE;
421 return NULL;
422 }
423 if (attribute == &bitwise_ident ||
424 attribute == &__bitwise___ident) {
425 if (Wbitwise)
426 ctype->modifiers |= MOD_BITWISE;
427 return NULL;
428 }
429 if (attribute == &address_space_ident) {
430 if (!expr)
431 return "expected address space number";
432 ctype->as = get_expression_value(expr);
433 return NULL;
434 }
435 if (attribute == &context_ident) {
436 if (expr && expr->type == EXPR_COMMA) {
437 int input = get_expression_value(expr->left);
438 int output = get_expression_value(expr->right);
439 ctype->in_context = input;
440 ctype->out_context = output;
441 return NULL;
442 }
443 return "expected context input/output values";
444 }
445 if (attribute == &mode_ident ||
446 attribute == &__mode___ident) {
447 if (expr && expr->type == EXPR_SYMBOL) {
448 struct ident *ident = expr->symbol_name;
449
450 /*
451 * Match against __QI__/__HI__/__SI__/__DI__
452 *
453 * FIXME! This is broken - we don't actually get
454 * the type information updated properly at this
455 * stage for some reason.
456 */
457 if (ident == &__QI___ident ||
458 ident == &QI_ident) {
459 ctype->modifiers |= MOD_CHAR;
460 return NULL;
461 }
462 if (ident == &__HI___ident ||
463 ident == &HI_ident) {
464 ctype->modifiers |= MOD_SHORT;
465 return NULL;
466 }
467 if (ident == &__SI___ident ||
468 ident == &SI_ident) {
469 /* Nothing? */
470 return NULL;
471 }
472 if (ident == &__DI___ident ||
473 ident == &DI_ident) {
474 ctype->modifiers |= MOD_LONGLONG;
475 return NULL;
476 }
477 if (ident == &__word___ident ||
478 ident == &word_ident) {
479 ctype->modifiers |= MOD_LONG;
480 return NULL;
481 }
482 return "unknown mode attribute";
483 }
484 return "expected attribute mode symbol";
485 }
486
487 /* Throw away for now.. */
488 if (attribute == &__transparent_union___ident) {
489 if (Wtransparent_union)
490 return "ignoring attribute __transparent_union__";
491 return NULL;
492 }
493 if (attribute == &nothrow_ident ||
494 attribute == &__nothrow_ident ||
495 attribute == &__nothrow___ident)
496 return NULL;
497 if (attribute == &__malloc___ident)
498 return NULL;
499 if (attribute == &nonnull_ident ||
500 attribute == &__nonnull_ident ||
501 attribute == &__nonnull___ident)
502 return NULL;
503 if (attribute == &format_ident ||
504 attribute == &__format___ident ||
505 attribute == &__format_arg___ident)
506 return NULL;
507 if (attribute == &section_ident ||
508 attribute == &__section___ident)
509 return NULL;
510 if (attribute == &unused_ident ||
511 attribute == &__unused___ident)
512 return NULL;
513 if (attribute == &const_ident ||
514 attribute == &__const_ident ||
515 attribute == &__const___ident)
516 return NULL;
517 if (attribute == &noreturn_ident ||
518 attribute == &__noreturn___ident)
519 return NULL;
520 if (attribute == &no_instrument_function_ident ||
521 attribute == &__no_instrument_function___ident)
522 return NULL;
523 if (attribute == &sentinel_ident ||
524 attribute == &__sentinel___ident)
525 return NULL;
526 if (attribute == &regparm_ident)
527 return NULL;
528 if (attribute == &weak_ident ||
529 attribute == &__weak___ident)
530 return NULL;
531 if (attribute == &alias_ident)
532 return NULL;
533 if (attribute == &pure_ident ||
534 attribute == &__pure___ident)
535 return NULL;
536 if (attribute == &always_inline_ident)
537 return NULL;
538 if (attribute == &syscall_linkage_ident)
539 return NULL;
540 if (attribute == &visibility_ident)
541 return NULL;
542 if (attribute == &deprecated_ident ||
543 attribute == &__deprecated___ident)
544 return NULL;
545 if (attribute == &noinline_ident)
546 return NULL;
547 if (attribute == &__used___ident)
548 return NULL;
549 if (attribute == &warn_unused_result_ident ||
550 attribute == &__warn_unused_result___ident)
551 return NULL;
552 if (attribute == &model_ident ||
553 attribute == &__model___ident)
554 return NULL;
555
556 return "unknown attribute";
557 }
558
559 static struct token *attribute_specifier(struct token *token, struct ctype *ctype)
560 {
561 ctype->modifiers = 0;
562 token = expect(token, '(', "after attribute");
563 token = expect(token, '(', "after attribute");
564
565 for (;;) {
566 const char *error_str;
567 struct ident *attribute_name;
568 struct expression *attribute_expr;
569
570 if (eof_token(token))
571 break;
572 if (match_op(token, ';'))
573 break;
574 if (token_type(token) != TOKEN_IDENT)
575 break;
576 attribute_name = token->ident;
577 token = token->next;
578 attribute_expr = NULL;
579 if (match_op(token, '('))
580 token = parens_expression(token, &attribute_expr, "in attribute");
581 error_str = handle_attribute(ctype, attribute_name, attribute_expr);
582 if (error_str)
583 sparse_error(token->pos, "attribute '%s': %s", show_ident(attribute_name), error_str);
584 if (!match_op(token, ','))
585 break;
586 token = token->next;
587 }
588
589 token = expect(token, ')', "after attribute");
590 token = expect(token, ')', "after attribute");
591 return token;
592 }
593
594 struct symbol * ctype_integer(unsigned long spec)
595 {
596 static struct symbol *const integer_ctypes[][3] = {
597 { &llong_ctype, &sllong_ctype, &ullong_ctype },
598 { &long_ctype, &slong_ctype, &ulong_ctype },
599 { &short_ctype, &sshort_ctype, &ushort_ctype },
600 { &char_ctype, &schar_ctype, &uchar_ctype },
601 { &int_ctype, &sint_ctype, &uint_ctype },
602 };
603 struct symbol *const (*ctype)[3];
604 int sub;
605
606 ctype = integer_ctypes;
607 if (!(spec & MOD_LONGLONG)) {
608 ctype++;
609 if (!(spec & MOD_LONG)) {
610 ctype++;
611 if (!(spec & MOD_SHORT)) {
612 ctype++;
613 if (!(spec & MOD_CHAR))
614 ctype++;
615 }
616 }
617 }
618
619 sub = ((spec & MOD_UNSIGNED)
620 ? 2
621 : ((spec & MOD_EXPLICITLY_SIGNED)
622 ? 1
623 : 0));
624
625 return ctype[0][sub];
626 }
627
628 struct symbol * ctype_fp(unsigned long spec)
629 {
630 if (spec & MOD_LONGLONG)
631 return &ldouble_ctype;
632 if (spec & MOD_LONG)
633 return &double_ctype;
634 return &float_ctype;
635 }
636
637 static void apply_ctype(struct position pos, struct ctype *thistype, struct ctype *ctype)
638 {
639 unsigned long mod = thistype->modifiers;
640
641 if (mod) {
642 unsigned long old = ctype->modifiers;
643 unsigned long extra = 0, dup, conflict;
644
645 if (mod & old & MOD_LONG) {
646 extra = MOD_LONGLONG | MOD_LONG;
647 mod &= ~MOD_LONG;
648 old &= ~MOD_LONG;
649 }
650 dup = (mod & old) | (extra & old) | (extra & mod);
651 if (dup)
652 sparse_error(pos, "Just how %sdo you want this type to be?",
653 modifier_string(dup));
654
655 conflict = !(~mod & ~old & (MOD_LONG | MOD_SHORT));
656 if (conflict)
657 sparse_error(pos, "You cannot have both long and short modifiers.");
658
659 conflict = !(~mod & ~old & (MOD_SIGNED | MOD_UNSIGNED));
660 if (conflict)
661 sparse_error(pos, "You cannot have both signed and unsigned modifiers.");
662
663 // Only one storage modifier allowed, except that "inline" doesn't count.
664 conflict = (mod | old) & (MOD_STORAGE & ~MOD_INLINE);
665 conflict &= (conflict - 1);
666 if (conflict)
667 sparse_error(pos, "multiple storage classes");
668
669 ctype->modifiers = old | mod | extra;
670 }
671
672 /* Context mask and value */
673 ctype->in_context += thistype->in_context;
674 ctype->out_context += thistype->out_context;
675
676 /* Alignment */
677 if (thistype->alignment & (thistype->alignment-1)) {
678 warning(pos, "I don't like non-power-of-2 alignments");
679 thistype->alignment = 0;
680 }
681 if (thistype->alignment > ctype->alignment)
682 ctype->alignment = thistype->alignment;
683
684 /* Address space */
685 if (thistype->as)
686 ctype->as = thistype->as;
687 }
688
689 static void check_modifiers(struct position *pos, struct symbol *s, unsigned long mod)
690 {
691 unsigned long banned, wrong;
692 unsigned long this_mod = s->ctype.modifiers;
693 const unsigned long BANNED_SIZE = MOD_LONG | MOD_LONGLONG | MOD_SHORT;
694 const unsigned long BANNED_SIGN = MOD_SIGNED | MOD_UNSIGNED;
695
696 if (this_mod & (MOD_STRUCTOF | MOD_UNIONOF | MOD_ENUMOF))
697 banned = BANNED_SIZE | BANNED_SIGN;
698 else if (this_mod & MOD_SPECIALBITS)
699 banned = 0;
700 else if (s->ctype.base_type == &fp_type)
701 banned = BANNED_SIGN;
702 else if (s->ctype.base_type == &int_type || !s->ctype.base_type || is_int_type (s))
703 banned = 0;
704 else {
705 // label_type
706 // void_type
707 // bad_type
708 // vector_type <-- whatever that is
709 banned = BANNED_SIZE | BANNED_SIGN;
710 }
711
712 wrong = mod & banned;
713 if (wrong)
714 sparse_error(*pos, "modifier %sis invalid in this context",
715 modifier_string (wrong));
716 }
717
718
719 static struct token *declaration_specifiers(struct token *next, struct ctype *ctype, int qual)
720 {
721 struct token *token;
722
723 while ( (token = next) != NULL ) {
724 struct ctype thistype;
725 struct ident *ident;
726 struct symbol *s, *type;
727 unsigned long mod;
728
729 next = token->next;
730 if (token_type(token) != TOKEN_IDENT)
731 break;
732 ident = token->ident;
733
734 s = lookup_symbol(ident, NS_TYPEDEF);
735 if (!s)
736 break;
737 thistype = s->ctype;
738 mod = thistype.modifiers;
739 if (qual && (mod & ~(MOD_ATTRIBUTE | MOD_CONST | MOD_VOLATILE)))
740 break;
741 if (mod & MOD_SPECIALBITS) {
742 if (mod & MOD_STRUCTOF)
743 next = struct_or_union_specifier(SYM_STRUCT, next, &thistype);
744 else if (mod & MOD_UNIONOF)
745 next = struct_or_union_specifier(SYM_UNION, next, &thistype);
746 else if (mod & MOD_ENUMOF)
747 next = enum_specifier(next, &thistype);
748 else if (mod & MOD_ATTRIBUTE)
749 next = attribute_specifier(next, &thistype);
750 else if (mod & MOD_TYPEOF)
751 next = typeof_specifier(next, &thistype);
752 mod = thistype.modifiers;
753 }
754 type = thistype.base_type;
755 if (type) {
756 if (qual)
757 break;
758 if (ctype->base_type)
759 break;
760 /* User types only mix with qualifiers */
761 if (mod & MOD_USERTYPE) {
762 if (ctype->modifiers & MOD_SPECIFIER)
763 break;
764 }
765 ctype->base_type = type;
766 }
767
768 check_modifiers(&token->pos, s, ctype->modifiers);
769 apply_ctype(token->pos, &thistype, ctype);
770 }
771
772 /* Turn the "virtual types" into real types with real sizes etc */
773 if (!ctype->base_type) {
774 struct symbol *base = &incomplete_ctype;
775
776 /*
777 * If we have modifiers, we'll default to an integer
778 * type, and "ctype_integer()" will turn this into
779 * a specific one.
780 */
781 if (ctype->modifiers & MOD_SPECIFIER)
782 base = &int_type;
783 ctype->base_type = base;
784 }
785 if (ctype->base_type == &int_type) {
786 ctype->base_type = ctype_integer(ctype->modifiers);
787 ctype->modifiers &= ~MOD_SPECIFIER;
788 } else if (ctype->base_type == &fp_type) {
789 ctype->base_type = ctype_fp(ctype->modifiers);
790 ctype->modifiers &= ~MOD_SPECIFIER;
791 }
792 if (ctype->modifiers & MOD_BITWISE) {
793 struct symbol *type;
794 ctype->modifiers &= ~(MOD_BITWISE | MOD_SPECIFIER);
795 if (!is_int_type(ctype->base_type)) {
796 sparse_error(token->pos, "invalid modifier");
797 return token;
798 }
799 type = alloc_symbol(token->pos, SYM_BASETYPE);
800 *type = *ctype->base_type;
801 type->ctype.base_type = ctype->base_type;
802 type->type = SYM_RESTRICT;
803 type->ctype.modifiers &= ~MOD_SPECIFIER;
804 ctype->base_type = type;
805 }
806 return token;
807 }
808
809 static struct token *abstract_array_declarator(struct token *token, struct symbol *sym)
810 {
811 struct expression *expr = NULL;
812
813 token = parse_expression(token, &expr);
814 sym->array_size = expr;
815 return token;
816 }
817
818 static struct token *parameter_type_list(struct token *, struct symbol *, struct ident **p);
819 static struct token *declarator(struct token *token, struct symbol *sym, struct ident **p);
820
821 static struct token *handle_attributes(struct token *token, struct ctype *ctype)
822 {
823 for (;;) {
824 if (token_type(token) != TOKEN_IDENT)
825 break;
826 if (match_idents(token, &__attribute___ident, &__attribute_ident, NULL)) {
827 struct ctype thistype = { 0, };
828 token = attribute_specifier(token->next, &thistype);
829 apply_ctype(token->pos, &thistype, ctype);
830 continue;
831 }
832 if (match_idents(token, &asm_ident, &__asm_ident, &__asm___ident)) {
833 struct expression *expr;
834 token = expect(token->next, '(', "after asm");
835 token = parse_expression(token->next, &expr);
836 token = expect(token, ')', "after asm");
837 continue;
838 }
839 break;
840 }
841 return token;
842 }
843
844 static struct token *direct_declarator(struct token *token, struct symbol *decl, struct ident **p)
845 {
846 struct ctype *ctype = &decl->ctype;
847
848 if (p && token_type(token) == TOKEN_IDENT) {
849 *p = token->ident;
850 token = token->next;
851 }
852
853 for (;;) {
854 token = handle_attributes(token, ctype);
855
856 if (token_type(token) != TOKEN_SPECIAL)
857 return token;
858
859 /*
860 * This can be either a parameter list or a grouping.
861 * For the direct (non-abstract) case, we know if must be
862 * a parameter list if we already saw the identifier.
863 * For the abstract case, we know if must be a parameter
864 * list if it is empty or starts with a type.
865 */
866 if (token->special == '(') {
867 struct symbol *sym;
868 struct token *next = token->next;
869 int fn = (p && *p) || match_op(next, ')') || lookup_type(next);
870
871 if (!fn) {
872 struct symbol *base_type = ctype->base_type;
873 token = declarator(next, decl, p);
874 token = expect(token, ')', "in nested declarator");
875 while (ctype->base_type != base_type)
876 ctype = &ctype->base_type->ctype;
877 p = NULL;
878 continue;
879 }
880
881 sym = indirect(token->pos, ctype, SYM_FN);
882 token = parameter_type_list(next, sym, p);
883 token = expect(token, ')', "in function declarator");
884 continue;
885 }
886 if (token->special == '[') {
887 struct symbol *array = indirect(token->pos, ctype, SYM_ARRAY);
888 token = abstract_array_declarator(token->next, array);
889 token = expect(token, ']', "in abstract_array_declarator");
890 ctype = &array->ctype;
891 continue;
892 }
893 break;
894 }
895 return token;
896 }
897
898 static struct token *pointer(struct token *token, struct ctype *ctype)
899 {
900 unsigned long modifiers;
901 struct symbol *base_type;
902
903 modifiers = ctype->modifiers & ~(MOD_TYPEDEF | MOD_ATTRIBUTE);
904 base_type = ctype->base_type;
905 ctype->modifiers = modifiers;
906
907 while (match_op(token,'*')) {
908 struct symbol *ptr = alloc_symbol(token->pos, SYM_PTR);
909 ptr->ctype.modifiers = modifiers & ~MOD_STORAGE;
910 ptr->ctype.as = ctype->as;
911 ptr->ctype.in_context += ctype->in_context;
912 ptr->ctype.out_context += ctype->out_context;
913 ptr->ctype.base_type = base_type;
914
915 base_type = ptr;
916 ctype->modifiers = modifiers & MOD_STORAGE;
917 ctype->base_type = base_type;
918 ctype->as = 0;
919 ctype->in_context = 0;
920 ctype->out_context = 0;
921
922 token = declaration_specifiers(token->next, ctype, 1);
923 modifiers = ctype->modifiers;
924 }
925 return token;
926 }
927
928 static struct token *declarator(struct token *token, struct symbol *sym, struct ident **p)
929 {
930 token = pointer(token, &sym->ctype);
931 return direct_declarator(token, sym, p);
932 }
933
934 static struct token *handle_bitfield(struct token *token, struct symbol *decl)
935 {
936 struct ctype *ctype = &decl->ctype;
937 struct expression *expr;
938 struct symbol *bitfield;
939 long long width;
940
941 if (!is_int_type(ctype->base_type)) {
942 sparse_error(token->pos, "invalid bitfield specifier for type %s.",
943 show_typename(ctype->base_type));
944 // Parse this to recover gracefully.
945 return conditional_expression(token->next, &expr);
946 }
947
948 bitfield = indirect(token->pos, ctype, SYM_BITFIELD);
949 token = conditional_expression(token->next, &expr);
950 width = get_expression_value(expr);
951 bitfield->bit_size = width;
952
953 if (width < 0 || width > INT_MAX) {
954 sparse_error(token->pos, "invalid bitfield width, %lld.", width);
955 width = -1;
956 } else if (decl->ident && width == 0) {
957 sparse_error(token->pos, "invalid named zero-width bitfield `%s'",
958 show_ident(decl->ident));
959 width = -1;
960 } else if (decl->ident) {
961 struct symbol *base_type = bitfield->ctype.base_type;
962 int is_signed = !(base_type->ctype.modifiers & MOD_UNSIGNED);
963 if (Wone_bit_signed_bitfield && width == 1 && is_signed) {
964 // Valid values are either {-1;0} or {0}, depending on integer
965 // representation. The latter makes for very efficient code...
966 sparse_error(token->pos, "dubious one-bit signed bitfield");
967 }
968 if (Wdefault_bitfield_sign &&
969 base_type->type != SYM_ENUM &&
970 !(base_type->ctype.modifiers & MOD_EXPLICITLY_SIGNED) &&
971 is_signed) {
972 // The sign of bitfields is unspecified by default.
973 sparse_error(token->pos, "dubious bitfield without explicit `signed' or `unsigned'");
974 }
975 }
976 bitfield->bit_size = width;
977 return token;
978 }
979
980 static struct token *declaration_list(struct token *token, struct symbol_list **list)
981 {
982 struct ctype ctype = {0, };
983
984 token = declaration_specifiers(token, &ctype, 0);
985 for (;;) {
986 struct ident *ident = NULL;
987 struct symbol *decl = alloc_symbol(token->pos, SYM_NODE);
988 decl->ctype = ctype;
989 token = declarator(token, decl, &ident);
990 decl->ident = ident;
991 if (match_op(token, ':')) {
992 token = handle_bitfield(token, decl);
993 token = handle_attributes(token, &decl->ctype);
994 }
995 add_symbol(list, decl);
996 if (!match_op(token, ','))
997 break;
998 token = token->next;
999 }
1000 return token;
1001 }
1002
1003 static struct token *struct_declaration_list(struct token *token, struct symbol_list **list)
1004 {
1005 while (!match_op(token, '}')) {
1006 token = declaration_list(token, list);
1007 if (!match_op(token, ';')) {
1008 sparse_error(token->pos, "expected ; at end of declaration");
1009 break;
1010 }
1011 token = token->next;
1012 }
1013 return token;
1014 }
1015
1016 static struct token *parameter_declaration(struct token *token, struct symbol **tree)
1017 {
1018 struct ident *ident = NULL;
1019 struct symbol *sym;
1020 struct ctype ctype = { 0, };
1021
1022 token = declaration_specifiers(token, &ctype, 0);
1023 sym = alloc_symbol(token->pos, SYM_NODE);
1024 sym->ctype = ctype;
1025 *tree = sym;
1026 token = declarator(token, sym, &ident);
1027 sym->ident = ident;
1028 return token;
1029 }
1030
1031 struct token *typename(struct token *token, struct symbol **p)
1032 {
1033 struct symbol *sym = alloc_symbol(token->pos, SYM_NODE);
1034 *p = sym;
1035 token = declaration_specifiers(token, &sym->ctype, 0);
1036 return declarator(token, sym, NULL);
1037 }
1038
1039 static struct token *expression_statement(struct token *token, struct expression **tree)
1040 {
1041 token = parse_expression(token, tree);
1042 return expect(token, ';', "at end of statement");
1043 }
1044
1045 static struct token *parse_asm_operands(struct token *token, struct statement *stmt,
1046 struct expression_list **inout)
1047 {
1048 struct expression *expr;
1049
1050 /* Allow empty operands */
1051 if (match_op(token->next, ':') || match_op(token->next, ')'))
1052 return token->next;
1053 do {
1054 struct ident *ident = NULL;
1055 if (match_op(token->next, '[') &&
1056 token_type(token->next->next) == TOKEN_IDENT &&
1057 match_op(token->next->next->next, ']')) {
1058 ident = token->next->next->ident;
1059 token = token->next->next->next;
1060 }
1061 add_expression(inout, (struct expression *)ident); /* UGGLEE!!! */
1062 token = primary_expression(token->next, &expr);
1063 add_expression(inout, expr);
1064 token = parens_expression(token, &expr, "in asm parameter");
1065 add_expression(inout, expr);
1066 } while (match_op(token, ','));
1067 return token;
1068 }
1069
1070 static struct token *parse_asm_clobbers(struct token *token, struct statement *stmt,
1071 struct expression_list **clobbers)
1072 {
1073 struct expression *expr;
1074
1075 do {
1076 token = primary_expression(token->next, &expr);
1077 add_expression(clobbers, expr);
1078 } while (match_op(token, ','));
1079 return token;
1080 }
1081
1082 static struct token *parse_asm(struct token *token, struct statement *stmt)
1083 {
1084 stmt->type = STMT_ASM;
1085 if (match_idents(token, &__volatile___ident, &__volatile_ident, &volatile_ident, NULL)) {
1086 token = token->next;
1087 }
1088 token = expect(token, '(', "after asm");
1089 token = parse_expression(token, &stmt->asm_string);
1090 if (match_op(token, ':'))
1091 token = parse_asm_operands(token, stmt, &stmt->asm_outputs);
1092 if (match_op(token, ':'))
1093 token = parse_asm_operands(token, stmt, &stmt->asm_inputs);
1094 if (match_op(token, ':'))
1095 token = parse_asm_clobbers(token, stmt, &stmt->asm_clobbers);
1096 token = expect(token, ')', "after asm");
1097 return expect(token, ';', "at end of asm-statement");
1098 }
1099
1100 /* Make a statement out of an expression */
1101 static struct statement *make_statement(struct expression *expr)
1102 {
1103 struct statement *stmt;
1104
1105 if (!expr)
1106 return NULL;
1107 stmt = alloc_statement(expr->pos, STMT_EXPRESSION);
1108 stmt->expression = expr;
1109 return stmt;
1110 }
1111
1112 /*
1113 * All iterators have two symbols associated with them:
1114 * the "continue" and "break" symbols, which are targets
1115 * for continue and break statements respectively.
1116 *
1117 * They are in a special name-space, but they follow
1118 * all the normal visibility rules, so nested iterators
1119 * automatically work right.
1120 */
1121 static void start_iterator(struct statement *stmt)
1122 {
1123 struct symbol *cont, *brk;
1124
1125 start_symbol_scope();
1126 cont = alloc_symbol(stmt->pos, SYM_NODE);
1127 bind_symbol(cont, &continue_ident, NS_ITERATOR);
1128 brk = alloc_symbol(stmt->pos, SYM_NODE);
1129 bind_symbol(brk, &break_ident, NS_ITERATOR);
1130
1131 stmt->type = STMT_ITERATOR;
1132 stmt->iterator_break = brk;
1133 stmt->iterator_continue = cont;
1134 fn_local_symbol(brk);
1135 fn_local_symbol(cont);
1136 }
1137
1138 static void end_iterator(struct statement *stmt)
1139 {
1140 end_symbol_scope();
1141 }
1142
1143 static struct statement *start_function(struct symbol *sym)
1144 {
1145 struct symbol *ret;
1146 struct statement *stmt = alloc_statement(sym->pos, STMT_COMPOUND);
1147
1148 start_function_scope();
1149 ret = alloc_symbol(sym->pos, SYM_NODE);
1150 ret->ctype = sym->ctype.base_type->ctype;
1151 ret->ctype.modifiers &= ~(MOD_STORAGE | MOD_CONST | MOD_VOLATILE | MOD_INLINE | MOD_ADDRESSABLE | MOD_NOCAST | MOD_NODEREF | MOD_ACCESSED | MOD_TOPLEVEL);
1152 ret->ctype.modifiers |= (MOD_AUTO | MOD_REGISTER);
1153 bind_symbol(ret, &return_ident, NS_ITERATOR);
1154 stmt->ret = ret;
1155 fn_local_symbol(ret);
1156
1157 // Currently parsed symbol for __func__/__FUNCTION__/__PRETTY_FUNCTION__
1158 current_fn = sym;
1159
1160 return stmt;
1161 }
1162
1163 static void end_function(struct symbol *sym)
1164 {
1165 current_fn = NULL;
1166 end_function_scope();
1167 }
1168
1169 /*
1170 * A "switch()" statement, like an iterator, has a
1171 * the "break" symbol associated with it. It works
1172 * exactly like the iterator break - it's the target
1173 * for any break-statements in scope, and means that
1174 * "break" handling doesn't even need to know whether
1175 * it's breaking out of an iterator or a switch.
1176 *
1177 * In addition, the "case" symbol is a marker for the
1178 * case/default statements to find the switch statement
1179 * that they are associated with.
1180 */
1181 static void start_switch(struct statement *stmt)
1182 {
1183 struct symbol *brk, *switch_case;
1184
1185 start_symbol_scope();
1186 brk = alloc_symbol(stmt->pos, SYM_NODE);
1187 bind_symbol(brk, &break_ident, NS_ITERATOR);
1188
1189 switch_case = alloc_symbol(stmt->pos, SYM_NODE);
1190 bind_symbol(switch_case, &case_ident, NS_ITERATOR);
1191 switch_case->stmt = stmt;
1192
1193 stmt->type = STMT_SWITCH;
1194 stmt->switch_break = brk;
1195 stmt->switch_case = switch_case;
1196
1197 fn_local_symbol(brk);
1198 fn_local_symbol(switch_case);
1199 }
1200
1201 static void end_switch(struct statement *stmt)
1202 {
1203 if (!stmt->switch_case->symbol_list)
1204 warning(stmt->pos, "switch with no cases");
1205 end_symbol_scope();
1206 }
1207
1208 static void add_case_statement(struct statement *stmt)
1209 {
1210 struct symbol *target = lookup_symbol(&case_ident, NS_ITERATOR);
1211 struct symbol *sym;
1212
1213 if (!target) {
1214 sparse_error(stmt->pos, "not in switch scope");
1215 stmt->type = STMT_NONE;
1216 return;
1217 }
1218 sym = alloc_symbol(stmt->pos, SYM_NODE);
1219 add_symbol(&target->symbol_list, sym);
1220 sym->stmt = stmt;
1221 stmt->case_label = sym;
1222 fn_local_symbol(sym);
1223 }
1224
1225 static struct token *parse_return_statement(struct token *token, struct statement *stmt)
1226 {
1227 struct symbol *target = lookup_symbol(&return_ident, NS_ITERATOR);
1228
1229 if (!target)
1230 error_die(token->pos, "internal error: return without a function target");
1231 stmt->type = STMT_RETURN;
1232 stmt->ret_target = target;
1233 return expression_statement(token->next, &stmt->ret_value);
1234 }
1235
1236 static struct token *parse_for_statement(struct token *token, struct statement *stmt)
1237 {
1238 struct symbol_list *syms;
1239 struct expression *e1, *e2, *e3;
1240 struct statement *iterator;
1241
1242 start_iterator(stmt);
1243 token = expect(token->next, '(', "after 'for'");
1244
1245 syms = NULL;
1246 e1 = NULL;
1247 /* C99 variable declaration? */
1248 if (lookup_type(token)) {
1249 token = external_declaration(token, &syms);
1250 } else {
1251 token = parse_expression(token, &e1);
1252 token = expect(token, ';', "in 'for'");
1253 }
1254 token = parse_expression(token, &e2);
1255 token = expect(token, ';', "in 'for'");
1256 token = parse_expression(token, &e3);
1257 token = expect(token, ')', "in 'for'");
1258 token = statement(token, &iterator);
1259
1260 stmt->iterator_syms = syms;
1261 stmt->iterator_pre_statement = make_statement(e1);
1262 stmt->iterator_pre_condition = e2;
1263 stmt->iterator_post_statement = make_statement(e3);
1264 stmt->iterator_post_condition = NULL;
1265 stmt->iterator_statement = iterator;
1266 end_iterator(stmt);
1267
1268 return token;
1269 }
1270
1271 static struct token *parse_while_statement(struct token *token, struct statement *stmt)
1272 {
1273 struct expression *expr;
1274 struct statement *iterator;
1275
1276 start_iterator(stmt);
1277 token = parens_expression(token->next, &expr, "after 'while'");
1278 token = statement(token, &iterator);
1279
1280 stmt->iterator_pre_condition = expr;
1281 stmt->iterator_post_condition = NULL;
1282 stmt->iterator_statement = iterator;
1283 end_iterator(stmt);
1284
1285 return token;
1286 }
1287
1288 static struct token *parse_do_statement(struct token *token, struct statement *stmt)
1289 {
1290 struct expression *expr;
1291 struct statement *iterator;
1292
1293 start_iterator(stmt);
1294 token = statement(token->next, &iterator);
1295 if (token_type(token) == TOKEN_IDENT && token->ident == &while_ident)
1296 token = token->next;
1297 else
1298 sparse_error(token->pos, "expected 'while' after 'do'");
1299 token = parens_expression(token, &expr, "after 'do-while'");
1300
1301 stmt->iterator_post_condition = expr;
1302 stmt->iterator_statement = iterator;
1303 end_iterator(stmt);
1304
1305 return expect(token, ';', "after statement");
1306 }
1307
1308 static struct token *statement(struct token *token, struct statement **tree)
1309 {
1310 struct statement *stmt = alloc_statement(token->pos, STMT_NONE);
1311
1312 *tree = stmt;
1313 if (token_type(token) == TOKEN_IDENT) {
1314 if (token->ident == &if_ident) {
1315 stmt->type = STMT_IF;
1316 token = parens_expression(token->next, &stmt->if_conditional, "after if");
1317 token = statement(token, &stmt->if_true);
1318 if (token_type(token) != TOKEN_IDENT)
1319 return token;
1320 if (token->ident != &else_ident)
1321 return token;
1322 return statement(token->next, &stmt->if_false);
1323 }
1324
1325 if (token->ident == &return_ident)
1326 return parse_return_statement(token, stmt);
1327
1328 if (token->ident == &break_ident || token->ident == &continue_ident) {
1329 struct symbol *target = lookup_symbol(token->ident, NS_ITERATOR);
1330 stmt->type = STMT_GOTO;
1331 stmt->goto_label = target;
1332 if (!target)
1333 sparse_error(stmt->pos, "break/continue not in iterator scope");
1334 return expect(token->next, ';', "at end of statement");
1335 }
1336 if (token->ident == &default_ident) {
1337 token = token->next;
1338 goto default_statement;
1339 }
1340 if (token->ident == &case_ident) {
1341 token = parse_expression(token->next, &stmt->case_expression);
1342 if (match_op(token, SPECIAL_ELLIPSIS))
1343 token = parse_expression(token->next, &stmt->case_to);
1344 default_statement:
1345 stmt->type = STMT_CASE;
1346 token = expect(token, ':', "after default/case");
1347 add_case_statement(stmt);
1348 return statement(token, &stmt->case_statement);
1349 }
1350 if (token->ident == &switch_ident) {
1351 stmt->type = STMT_SWITCH;
1352 start_switch(stmt);
1353 token = parens_expression(token->next, &stmt->switch_expression, "after 'switch'");
1354 token = statement(token, &stmt->switch_statement);
1355 end_switch(stmt);
1356 return token;
1357 }
1358 if (token->ident == &for_ident)
1359 return parse_for_statement(token, stmt);
1360
1361 if (token->ident == &while_ident)
1362 return parse_while_statement(token, stmt);
1363
1364 if (token->ident == &do_ident)
1365 return parse_do_statement(token, stmt);
1366
1367 if (token->ident == &goto_ident) {
1368 stmt->type = STMT_GOTO;
1369 token = token->next;
1370 if (match_op(token, '*')) {
1371 token = parse_expression(token->next, &stmt->goto_expression);
1372 add_statement(&function_computed_goto_list, stmt);
1373 } else if (token_type(token) == TOKEN_IDENT) {
1374 stmt->goto_label = label_symbol(token);
1375 token = token->next;
1376 } else {
1377 sparse_error(token->pos, "Expected identifier or goto expression");
1378 }
1379 return expect(token, ';', "at end of statement");
1380 }
1381 if (match_idents(token, &asm_ident, &__asm___ident, &__asm_ident, NULL)) {
1382 return parse_asm(token->next, stmt);
1383 }
1384 if (token->ident == &__context___ident) {
1385 stmt->type = STMT_CONTEXT;
1386 token = parse_expression(token->next, &stmt->expression);
1387 return expect(token, ';', "at end of statement");
1388 }
1389 if (token->ident == &__range___ident) {
1390 stmt->type = STMT_RANGE;
1391 token = assignment_expression(token->next, &stmt->range_expression);
1392 token = expect(token, ',', "after range expression");
1393 token = assignment_expression(token, &stmt->range_low);
1394 token = expect(token, ',', "after low range");
1395 token = assignment_expression(token, &stmt->range_high);
1396 return expect(token, ';', "after range statement");
1397 }
1398 if (match_op(token->next, ':')) {
1399 stmt->type = STMT_LABEL;
1400 stmt->label_identifier = label_symbol(token);
1401 return statement(token->next->next, &stmt->label_statement);
1402 }
1403 }
1404
1405 if (match_op(token, '{')) {
1406 stmt->type = STMT_COMPOUND;
1407 start_symbol_scope();
1408 token = compound_statement(token->next, stmt);
1409 end_symbol_scope();
1410
1411 return expect(token, '}', "at end of compound statement");
1412 }
1413
1414 stmt->type = STMT_EXPRESSION;
1415 return expression_statement(token, &stmt->expression);
1416 }
1417
1418 static struct token * statement_list(struct token *token, struct statement_list **list)
1419 {
1420 int seen_statement = 0;
1421 for (;;) {
1422 struct statement * stmt;
1423 if (eof_token(token))
1424 break;
1425 if (match_op(token, '}'))
1426 break;
1427 if (lookup_type(token)) {
1428 if (seen_statement) {
1429 warning(token->pos, "mixing declarations and code");
1430 seen_statement = 0;
1431 }
1432 stmt = alloc_statement(token->pos, STMT_DECLARATION);
1433 token = external_declaration(token, &stmt->declaration);
1434 } else {
1435 seen_statement = warn_on_mixed;
1436 token = statement(token, &stmt);
1437 }
1438 add_statement(list, stmt);
1439 }
1440 return token;
1441 }
1442
1443 static struct token *parameter_type_list(struct token *token, struct symbol *fn, struct ident **p)
1444 {
1445 struct symbol_list **list = &fn->arguments;
1446
1447 if (match_op(token, ')')) {
1448 // No warning for "void oink ();"
1449 // Bug or feature: warns for "void oink () __attribute__ ((noreturn));"
1450 if (p && !match_op(token->next, ';'))
1451 warning(token->pos, "non-ANSI function declaration of function '%s'", show_ident(*p));
1452 return token;
1453 }
1454
1455 for (;;) {
1456 struct symbol *sym;
1457
1458 if (match_op(token, SPECIAL_ELLIPSIS)) {
1459 if (!*list)
1460 warning(token->pos, "variadic functions must have one named argument");
1461 fn->variadic = 1;
1462 token = token->next;
1463 break;
1464 }
1465
1466 sym = alloc_symbol(token->pos, SYM_NODE);
1467 token = parameter_declaration(token, &sym);
1468 if (sym->ctype.base_type == &void_ctype) {
1469 /* Special case: (void) */
1470 if (!*list && !sym->ident)
1471 break;
1472 warning(token->pos, "void parameter");
1473 }
1474 add_symbol(list, sym);
1475 if (!match_op(token, ','))
1476 break;
1477 token = token->next;
1478
1479 }
1480 return token;
1481 }
1482
1483 struct token *compound_statement(struct token *token, struct statement *stmt)
1484 {
1485 token = statement_list(token, &stmt->stmts);
1486 return token;
1487 }
1488
1489 static struct expression *identifier_expression(struct token *token)
1490 {
1491 struct expression *expr = alloc_expression(token->pos, EXPR_IDENTIFIER);
1492 expr->expr_ident = token->ident;
1493 return expr;
1494 }
1495
1496 static struct expression *index_expression(struct expression *from, struct expression *to)
1497 {
1498 int idx_from, idx_to;
1499 struct expression *expr = alloc_expression(from->pos, EXPR_INDEX);
1500
1501 idx_from = get_expression_value(from);
1502 idx_to = idx_from;
1503 if (to) {
1504 idx_to = get_expression_value(to);
1505 if (idx_to < idx_from || idx_from < 0)
1506 warning(from->pos, "nonsense array initializer index range");
1507 }
1508 expr->idx_from = idx_from;
1509 expr->idx_to = idx_to;
1510 return expr;
1511 }
1512
1513 static struct token *single_initializer(struct expression **ep, struct token *token)
1514 {
1515 int expect_equal = 0;
1516 struct token *next = token->next;
1517 struct expression **tail = ep;
1518 int nested;
1519
1520 *ep = NULL;
1521
1522 if ((token_type(token) == TOKEN_IDENT) && match_op(next, ':')) {
1523 struct expression *expr = identifier_expression(token);
1524 warning(token->pos, "obsolete struct initializer, use C99 syntax");
1525 token = initializer(&expr->ident_expression, next->next);
1526 if (expr->ident_expression)
1527 *ep = expr;
1528 return token;
1529 }
1530
1531 for (tail = ep, nested = 0; ; nested++, next = token->next) {
1532 if (match_op(token, '.') && (token_type(next) == TOKEN_IDENT)) {
1533 struct expression *expr = identifier_expression(next);
1534 *tail = expr;
1535 tail = &expr->ident_expression;
1536 expect_equal = 1;
1537 token = next->next;
1538 } else if (match_op(token, '[')) {
1539 struct expression *from = NULL, *to = NULL, *expr;
1540 token = constant_expression(token->next, &from);
1541 if (!from) {
1542 sparse_error(token->pos, "Expected constant expression");
1543 break;
1544 }
1545 if (match_op(token, SPECIAL_ELLIPSIS))
1546 token = constant_expression(token->next, &to);
1547 expr = index_expression(from, to);
1548 *tail = expr;
1549 tail = &expr->idx_expression;
1550 token = expect(token, ']', "at end of initializer index");
1551 if (nested)
1552 expect_equal = 1;
1553 } else {
1554 break;
1555 }
1556 }
1557 if (nested && !expect_equal) {
1558 if (!match_op(token, '='))
1559 warning(token->pos, "obsolete array initializer, use C99 syntax");
1560 else
1561 expect_equal = 1;
1562 }
1563 if (expect_equal)
1564 token = expect(token, '=', "at end of initializer index");
1565
1566 token = initializer(tail, token);
1567 if (!*tail)
1568 *ep = NULL;
1569 return token;
1570 }
1571
1572 static struct token *initializer_list(struct expression_list **list, struct token *token)
1573 {
1574 struct expression *expr;
1575
1576 for (;;) {
1577 token = single_initializer(&expr, token);
1578 if (!expr)
1579 break;
1580 add_expression(list, expr);
1581 if (!match_op(token, ','))
1582 break;
1583 token = token->next;
1584 }
1585 return token;
1586 }
1587
1588 struct token *initializer(struct expression **tree, struct token *token)
1589 {
1590 if (match_op(token, '{')) {
1591 struct expression *expr = alloc_expression(token->pos, EXPR_INITIALIZER);
1592 *tree = expr;
1593 token = initializer_list(&expr->expr_list, token->next);
1594 return expect(token, '}', "at end of initializer");
1595 }
1596 return assignment_expression(token, tree);
1597 }
1598
1599 static void declare_argument(struct symbol *sym, struct symbol *fn)
1600 {
1601 if (!sym->ident) {
1602 sparse_error(sym->pos, "no identifier for function argument");
1603 return;
1604 }
1605 bind_symbol(sym, sym->ident, NS_SYMBOL);
1606 }
1607
1608 static struct token *parse_function_body(struct token *token, struct symbol *decl,
1609 struct symbol_list **list)
1610 {
1611 struct symbol_list **old_symbol_list;
1612 struct symbol *base_type = decl->ctype.base_type;
1613 struct statement *stmt, **p;
1614 struct symbol *arg;
1615
1616 old_symbol_list = function_symbol_list;
1617 if (decl->ctype.modifiers & MOD_INLINE) {
1618 function_symbol_list = &decl->inline_symbol_list;
1619 p = &base_type->inline_stmt;
1620 } else {
1621 function_symbol_list = &decl->symbol_list;
1622 p = &base_type->stmt;
1623 }
1624 function_computed_target_list = NULL;
1625 function_computed_goto_list = NULL;
1626
1627 if (decl->ctype.modifiers & MOD_EXTERN) {
1628 if (!(decl->ctype.modifiers & MOD_INLINE))
1629 warning(decl->pos, "function '%s' with external linkage has definition", show_ident(decl->ident));
1630 }
1631 if (!(decl->ctype.modifiers & MOD_STATIC))
1632 decl->ctype.modifiers |= MOD_EXTERN;
1633
1634 stmt = start_function(decl);
1635
1636 *p = stmt;
1637 FOR_EACH_PTR (base_type->arguments, arg) {
1638 declare_argument(arg, base_type);
1639 } END_FOR_EACH_PTR(arg);
1640
1641 token = compound_statement(token->next, stmt);
1642
1643 end_function(decl);
1644 if (!(decl->ctype.modifiers & MOD_INLINE))
1645 add_symbol(list, decl);
1646 check_declaration(decl);
1647 function_symbol_list = old_symbol_list;
1648 if (function_computed_goto_list) {
1649 if (!function_computed_target_list)
1650 warning(decl->pos, "function '%s' has computed goto but no targets?", show_ident(decl->ident));
1651 else {
1652 struct statement *stmt;
1653 FOR_EACH_PTR(function_computed_goto_list, stmt) {
1654 stmt->target_list = function_computed_target_list;
1655 } END_FOR_EACH_PTR(stmt);
1656 }
1657 }
1658 return expect(token, '}', "at end of function");
1659 }
1660
1661 static void promote_k_r_types(struct symbol *arg)
1662 {
1663 struct symbol *base = arg->ctype.base_type;
1664 if (base && base->ctype.base_type == &int_type && (base->ctype.modifiers & (MOD_CHAR | MOD_SHORT))) {
1665 arg->ctype.base_type = &int_ctype;
1666 }
1667 }
1668
1669 static void apply_k_r_types(struct symbol_list *argtypes, struct symbol *fn)
1670 {
1671 struct symbol_list *real_args = fn->ctype.base_type->arguments;
1672 struct symbol *arg;
1673
1674 FOR_EACH_PTR(real_args, arg) {
1675 struct symbol *type;
1676
1677 /* This is quadratic in the number of arguments. We _really_ don't care */
1678 FOR_EACH_PTR(argtypes, type) {
1679 if (type->ident == arg->ident)
1680 goto match;
1681 } END_FOR_EACH_PTR(type);
1682 sparse_error(arg->pos, "missing type declaration for parameter '%s'", show_ident(arg->ident));
1683 continue;
1684 match:
1685 type->used = 1;
1686 /* "char" and "short" promote to "int" */
1687 promote_k_r_types(type);
1688
1689 arg->ctype = type->ctype;
1690 } END_FOR_EACH_PTR(arg);
1691
1692 FOR_EACH_PTR(argtypes, arg) {
1693 if (!arg->used)
1694 warning(arg->pos, "nonsensical parameter declaration '%s'", show_ident(arg->ident));
1695 } END_FOR_EACH_PTR(arg);
1696
1697 }
1698
1699 static struct token *parse_k_r_arguments(struct token *token, struct symbol *decl,
1700 struct symbol_list **list)
1701 {
1702 struct symbol_list *args = NULL;
1703
1704 warning(token->pos, "non-ANSI definition of function '%s'", show_ident(decl->ident));
1705 do {
1706 token = declaration_list(token, &args);
1707 if (!match_op(token, ';')) {
1708 sparse_error(token->pos, "expected ';' at end of parameter declaration");
1709 break;
1710 }
1711 token = token->next;
1712 } while (lookup_type(token));
1713
1714 apply_k_r_types(args, decl);
1715
1716 if (!match_op(token, '{')) {
1717 sparse_error(token->pos, "expected function body");
1718 return token;
1719 }
1720 return parse_function_body(token, decl, list);
1721 }
1722
1723
1724 struct token *external_declaration(struct token *token, struct symbol_list **list)
1725 {
1726 struct ident *ident = NULL;
1727 struct symbol *decl;
1728 struct ctype ctype = { 0, };
1729 struct symbol *base_type;
1730 int is_typedef;
1731
1732 /* Top-level inline asm? */
1733 if (match_idents(token, &asm_ident, &__asm___ident, &__asm_ident, NULL)) {
1734 struct symbol *anon = alloc_symbol(token->pos, SYM_NODE);
1735 struct symbol *fn = alloc_symbol(token->pos, SYM_FN);
1736 struct statement *stmt;
1737
1738 anon->ctype.base_type = fn;
1739 stmt = alloc_statement(token->pos, STMT_NONE);
1740 fn->stmt = stmt;
1741
1742 token = parse_asm(token->next, stmt);
1743
1744 add_symbol(list, anon);
1745 return token;
1746 }
1747
1748 /* Parse declaration-specifiers, if any */
1749 token = declaration_specifiers(token, &ctype, 0);
1750 decl = alloc_symbol(token->pos, SYM_NODE);
1751 decl->ctype = ctype;
1752 token = declarator(token, decl, &ident);
1753
1754 /* Just a type declaration? */
1755 if (!ident)
1756 return expect(token, ';', "end of type declaration");
1757
1758 /* type define declaration? */
1759 is_typedef = (ctype.modifiers & MOD_TYPEDEF) != 0;
1760
1761 /* Typedef's don't have meaningful storage */
1762 if (is_typedef) {
1763 ctype.modifiers &= ~MOD_STORAGE;
1764 decl->ctype.modifiers &= ~MOD_STORAGE;
1765 decl->ctype.modifiers |= MOD_USERTYPE;
1766 }
1767
1768 bind_symbol(decl, ident, is_typedef ? NS_TYPEDEF: NS_SYMBOL);
1769
1770 base_type = decl->ctype.base_type;
1771
1772 if (is_typedef) {
1773 if (base_type && !base_type->ident)
1774 base_type->ident = ident;
1775 } else if (base_type && base_type->type == SYM_FN) {
1776 /* K&R argument declaration? */
1777 if (lookup_type(token))
1778 return parse_k_r_arguments(token, decl, list);
1779 if (match_op(token, '{'))
1780 return parse_function_body(token, decl, list);
1781
1782 if (!(decl->ctype.modifiers & MOD_STATIC))
1783 decl->ctype.modifiers |= MOD_EXTERN;
1784 } else if (base_type == &void_ctype && !(decl->ctype.modifiers & MOD_EXTERN)) {
1785 sparse_error(token->pos, "void declaration");
1786 }
1787
1788 for (;;) {
1789 if (!is_typedef && match_op(token, '=')) {
1790 if (decl->ctype.modifiers & MOD_EXTERN) {
1791 warning(decl->pos, "symbol with external linkage has initializer");
1792 decl->ctype.modifiers &= ~MOD_EXTERN;
1793 }
1794 token = initializer(&decl->initializer, token->next);
1795 }
1796 if (!is_typedef) {
1797 if (!(decl->ctype.modifiers & (MOD_EXTERN | MOD_INLINE))) {
1798 add_symbol(list, decl);
1799 fn_local_symbol(decl);
1800 }
1801 }
1802 check_declaration(decl);
1803
1804 if (!match_op(token, ','))
1805 break;
1806
1807 token = token->next;
1808 ident = NULL;
1809 decl = alloc_symbol(token->pos, SYM_NODE);
1810 decl->ctype = ctype;
1811 token = declaration_specifiers(token, &decl->ctype, 1);
1812 token = declarator(token, decl, &ident);
1813 if (!ident) {
1814 sparse_error(token->pos, "expected identifier name in type definition");
1815 return token;
1816 }
1817
1818 bind_symbol(decl, ident, is_typedef ? NS_TYPEDEF: NS_SYMBOL);
1819
1820 /* Function declarations are automatically extern unless specifically static */
1821 base_type = decl->ctype.base_type;
1822 if (!is_typedef && base_type && base_type->type == SYM_FN) {
1823 if (!(decl->ctype.modifiers & MOD_STATIC))
1824 decl->ctype.modifiers |= MOD_EXTERN;
1825 }
1826 }
1827 return expect(token, ';', "at end of declaration");
1828 }
Static analysis for C