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[PATCH] fix of compound literals on inlining
[smatch.git] / parse.c
blobcfda330998a01f1db4ad1af8678f732b68a942eb
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
113 ctype->modifiers = 0;
114 if (token_type(token) == TOKEN_IDENT) {
115 sym = lookup_symbol(token->ident, NS_STRUCT);
116 if (!sym ||
117 (sym->scope != block_scope &&
118 (match_op(token->next,';') || match_op(token->next,'{')))) {
119 // Either a new symbol, or else an out-of-scope
120 // symbol being redefined.
121 sym = alloc_symbol(token->pos, type);
122 bind_symbol(sym, token->ident, NS_STRUCT);
123 }
124 if (sym->type != type)
125 error_die(token->pos, "invalid tag applied to %s", show_typename (sym));
126 token = token->next;
127 ctype->base_type = sym;
128 if (match_op(token, '{')) {
129 // The following test is actually wrong for empty
130 // structs, but (1) they are not C99, (2) gcc does
131 // the same thing, and (3) it's easier.
132 if (sym->symbol_list)
133 error_die(token->pos, "redefinition of %s", show_typename (sym));
134 token = parse(token->next, sym);
135 token = expect(token, '}', "at end of struct-union-enum-specifier");
136
137 // Mark the structure as needing re-examination
138 sym->examined = 0;
139 }
140 return token;
141 }
142
143 // private struct/union/enum type
144 if (!match_op(token, '{')) {
145 sparse_error(token->pos, "expected declaration");
146 ctype->base_type = &bad_ctype;
147 return token;
148 }
149
150 sym = alloc_symbol(token->pos, type);
151 token = parse(token->next, sym);
152 ctype->base_type = sym;
153 return expect(token, '}', "at end of specifier");
154 }
155
156 static struct token *parse_struct_declaration(struct token *token, struct symbol *sym)
157 {
158 return struct_declaration_list(token, &sym->symbol_list);
159 }
160
161 static struct token *struct_or_union_specifier(enum type type, struct token *token, struct ctype *ctype)
162 {
163 return struct_union_enum_specifier(type, token, ctype, parse_struct_declaration);
164 }
165
166 typedef struct {
167 int x;
168 unsigned long long y;
169 } Num;
170
171 static void upper_boundary(Num *n, Num *v)
172 {
173 if (n->x > v->x)
174 return;
175 if (n->x < v->x) {
176 *n = *v;
177 return;
178 }
179 if (n->y < v->y)
180 n->y = v->y;
181 }
182
183 static void lower_boundary(Num *n, Num *v)
184 {
185 if (n->x < v->x)
186 return;
187 if (n->x > v->x) {
188 *n = *v;
189 return;
190 }
191 if (n->y > v->y)
192 n->y = v->y;
193 }
194
195 static int type_is_ok(struct symbol *type, Num *upper, Num *lower)
196 {
197 int shift = type->bit_size;
198 int is_unsigned = type->ctype.modifiers & MOD_UNSIGNED;
199
200 if (!is_unsigned)
201 shift--;
202 if (upper->x == 0 && upper->y >> shift)
203 return 0;
204 if (lower->x == 0 || (!is_unsigned && (~lower->y >> shift) == 0))
205 return 1;
206 return 0;
207 }
208
209 static struct symbol *bigger_enum_type(struct symbol *s1, struct symbol *s2)
210 {
211 if (s1->bit_size < s2->bit_size) {
212 s1 = s2;
213 } else if (s1->bit_size == s2->bit_size) {
214 if (s2->ctype.modifiers & MOD_UNSIGNED)
215 s1 = s2;
216 }
217 if (s1->bit_size < bits_in_int)
218 return &int_ctype;
219 return s1;
220 }
221
222 static void cast_enum_list(struct symbol_list *list, struct symbol *base_type)
223 {
224 struct symbol *sym;
225
226 FOR_EACH_PTR(list, sym) {
227 struct expression *expr = sym->initializer;
228 struct symbol *ctype;
229 if (expr->type != EXPR_VALUE)
230 continue;
231 ctype = expr->ctype;
232 if (ctype->bit_size == base_type->bit_size)
233 continue;
234 cast_value(expr, base_type, expr, ctype);
235 } END_FOR_EACH_PTR(sym);
236 }
237
238 static struct token *parse_enum_declaration(struct token *token, struct symbol *parent)
239 {
240 unsigned long long lastval = 0;
241 struct symbol *ctype = NULL, *base_type = NULL;
242 Num upper = {-1, 0}, lower = {1, 0};
243 struct symbol_list *entries = NULL;
244
245 parent->examined = 1;
246 parent->ctype.base_type = &int_ctype;
247 while (token_type(token) == TOKEN_IDENT) {
248 struct expression *expr = NULL;
249 struct token *next = token->next;
250 struct symbol *sym;
251
252 sym = alloc_symbol(token->pos, SYM_NODE);
253 bind_symbol(sym, token->ident, NS_SYMBOL);
254 sym->ctype.modifiers &= ~MOD_ADDRESSABLE;
255
256 if (match_op(next, '=')) {
257 next = constant_expression(next->next, &expr);
258 lastval = get_expression_value(expr);
259 ctype = &void_ctype;
260 if (expr && expr->ctype)
261 ctype = expr->ctype;
262 } else if (!ctype) {
263 ctype = &int_ctype;
264 } else if (is_int_type(ctype)) {
265 lastval++;
266 } else {
267 error_die(token->pos, "can't increment the last enum member");
268 }
269
270 if (!expr) {
271 expr = alloc_expression(token->pos, EXPR_VALUE);
272 expr->value = lastval;
273 expr->ctype = ctype;
274 }
275
276 sym->initializer = expr;
277 sym->ctype.base_type = parent;
278 add_ptr_list(&entries, sym);
279
280 if (base_type != &bad_ctype) {
281 if (ctype->type == SYM_NODE)
282 ctype = ctype->ctype.base_type;
283 if (ctype->type == SYM_ENUM) {
284 if (ctype == parent)
285 ctype = base_type;
286 else
287 ctype = ctype->ctype.base_type;
288 }
289 /*
290 * base_type rules:
291 * - if all enum's are of the same type, then
292 * the base_type is that type (two first
293 * cases)
294 * - if enums are of different types, they
295 * all have to be integer types, and the
296 * base type is at least "int_ctype".
297 * - otherwise the base_type is "bad_ctype".
298 */
299 if (!base_type) {
300 base_type = ctype;
301 } else if (ctype == base_type) {
302 /* nothing */
303 } else if (is_int_type(base_type) && is_int_type(ctype)) {
304 base_type = bigger_enum_type(base_type, ctype);
305 } else
306 base_type = &bad_ctype;
307 parent->ctype.base_type = base_type;
308 }
309 if (is_int_type(base_type)) {
310 Num v = {.y = lastval};
311 if (ctype->ctype.modifiers & MOD_UNSIGNED)
312 v.x = 0;
313 else if ((long long)lastval >= 0)
314 v.x = 0;
315 else
316 v.x = -1;
317 upper_boundary(&upper, &v);
318 lower_boundary(&lower, &v);
319 }
320 token = next;
321 if (!match_op(token, ','))
322 break;
323 token = token->next;
324 }
325 if (!base_type) {
326 sparse_error(token->pos, "bad enum definition");
327 base_type = &bad_ctype;
328 }
329 else if (!is_int_type(base_type))
330 base_type = base_type;
331 else if (type_is_ok(base_type, &upper, &lower))
332 base_type = base_type;
333 else if (type_is_ok(&int_ctype, &upper, &lower))
334 base_type = &int_ctype;
335 else if (type_is_ok(&uint_ctype, &upper, &lower))
336 base_type = &uint_ctype;
337 else if (type_is_ok(&long_ctype, &upper, &lower))
338 base_type = &long_ctype;
339 else if (type_is_ok(&ulong_ctype, &upper, &lower))
340 base_type = &ulong_ctype;
341 else if (type_is_ok(&llong_ctype, &upper, &lower))
342 base_type = &llong_ctype;
343 else if (type_is_ok(&ullong_ctype, &upper, &lower))
344 base_type = &ullong_ctype;
345 else
346 base_type = &bad_ctype;
347 parent->ctype.base_type = base_type;
348 parent->ctype.modifiers |= (base_type->ctype.modifiers & MOD_UNSIGNED);
349 parent->examined = 0;
350
351 cast_enum_list(entries, base_type);
352 free_ptr_list(&entries);
353
354 return token;
355 }
356
357 static struct token *enum_specifier(struct token *token, struct ctype *ctype)
358 {
359 struct token *ret = struct_union_enum_specifier(SYM_ENUM, token, ctype, parse_enum_declaration);
360
361 ctype = &ctype->base_type->ctype;
362 if (!ctype->base_type)
363 ctype->base_type = &incomplete_ctype;
364
365 return ret;
366 }
367
368 static struct token *typeof_specifier(struct token *token, struct ctype *ctype)
369 {
370 struct symbol *sym;
371
372 if (!match_op(token, '(')) {
373 sparse_error(token->pos, "expected '(' after typeof");
374 return token;
375 }
376 if (lookup_type(token->next)) {
377 token = typename(token->next, &sym);
378 *ctype = sym->ctype;
379 } else {
380 struct symbol *typeof_sym = alloc_symbol(token->pos, SYM_TYPEOF);
381 token = parse_expression(token->next, &typeof_sym->initializer);
382
383 ctype->modifiers = 0;
384 ctype->base_type = typeof_sym;
385 }
386 return expect(token, ')', "after typeof");
387 }
388
389 static const char * handle_attribute(struct ctype *ctype, struct ident *attribute, struct expression *expr)
390 {
391 if (attribute == &packed_ident ||
392 attribute == &__packed___ident) {
393 ctype->alignment = 1;
394 return NULL;
395 }
396 if (attribute == &aligned_ident ||
397 attribute == &__aligned___ident) {
398 int alignment = max_alignment;
399 if (expr)
400 alignment = get_expression_value(expr);
401 ctype->alignment = alignment;
402 return NULL;
403 }
404 if (attribute == &nocast_ident) {
405 ctype->modifiers |= MOD_NOCAST;
406 return NULL;
407 }
408 if (attribute == &noderef_ident) {
409 ctype->modifiers |= MOD_NODEREF;
410 return NULL;
411 }
412 if (attribute == &safe_ident) {
413 ctype->modifiers |= MOD_SAFE;
414 return NULL;
415 }
416 if (attribute == &force_ident) {
417 ctype->modifiers |= MOD_FORCE;
418 return NULL;
419 }
420 if (attribute == &bitwise_ident ||
421 attribute == &__bitwise___ident) {
422 if (Wbitwise)
423 ctype->modifiers |= MOD_BITWISE;
424 return NULL;
425 }
426 if (attribute == &address_space_ident) {
427 if (!expr)
428 return "expected address space number";
429 ctype->as = get_expression_value(expr);
430 return NULL;
431 }
432 if (attribute == &context_ident) {
433 if (expr && expr->type == EXPR_COMMA) {
434 int input = get_expression_value(expr->left);
435 int output = get_expression_value(expr->right);
436 ctype->in_context = input;
437 ctype->out_context = output;
438 return NULL;
439 }
440 return "expected context input/output values";
441 }
442 if (attribute == &mode_ident ||
443 attribute == &__mode___ident) {
444 if (expr && expr->type == EXPR_SYMBOL) {
445 struct ident *ident = expr->symbol_name;
446
447 /*
448 * Match against __QI__/__HI__/__SI__/__DI__
449 *
450 * FIXME! This is broken - we don't actually get
451 * the type information updated properly at this
452 * stage for some reason.
453 */
454 if (ident == &__QI___ident ||
455 ident == &QI_ident) {
456 ctype->modifiers |= MOD_CHAR;
457 return NULL;
458 }
459 if (ident == &__HI___ident ||
460 ident == &HI_ident) {
461 ctype->modifiers |= MOD_SHORT;
462 return NULL;
463 }
464 if (ident == &__SI___ident ||
465 ident == &SI_ident) {
466 /* Nothing? */
467 return NULL;
468 }
469 if (ident == &__DI___ident ||
470 ident == &DI_ident) {
471 ctype->modifiers |= MOD_LONGLONG;
472 return NULL;
473 }
474 if (ident == &__word___ident ||
475 ident == &word_ident) {
476 ctype->modifiers |= MOD_LONG;
477 return NULL;
478 }
479 return "unknown mode attribute";
480 }
481 return "expected attribute mode symbol";
482 }
483
484 /* Throw away for now.. */
485 if (attribute == &__transparent_union___ident) {
486 if (Wtransparent_union)
487 return "ignoring attribute __transparent_union__";
488 return NULL;
489 }
490 if (attribute == &nothrow_ident ||
491 attribute == &__nothrow_ident ||
492 attribute == &__nothrow___ident)
493 return NULL;
494 if (attribute == &__malloc___ident)
495 return NULL;
496 if (attribute == &nonnull_ident ||
497 attribute == &__nonnull_ident ||
498 attribute == &__nonnull___ident)
499 return NULL;
500 if (attribute == &format_ident ||
501 attribute == &__format___ident ||
502 attribute == &__format_arg___ident)
503 return NULL;
504 if (attribute == &section_ident ||
505 attribute == &__section___ident)
506 return NULL;
507 if (attribute == &unused_ident ||
508 attribute == &__unused___ident)
509 return NULL;
510 if (attribute == &const_ident ||
511 attribute == &__const_ident ||
512 attribute == &__const___ident)
513 return NULL;
514 if (attribute == &noreturn_ident ||
515 attribute == &__noreturn___ident)
516 return NULL;
517 if (attribute == &regparm_ident)
518 return NULL;
519 if (attribute == &weak_ident ||
520 attribute == &__weak___ident)
521 return NULL;
522 if (attribute == &alias_ident)
523 return NULL;
524 if (attribute == &pure_ident ||
525 attribute == &__pure___ident)
526 return NULL;
527 if (attribute == &always_inline_ident)
528 return NULL;
529 if (attribute == &syscall_linkage_ident)
530 return NULL;
531 if (attribute == &visibility_ident)
532 return NULL;
533 if (attribute == &deprecated_ident ||
534 attribute == &__deprecated___ident)
535 return NULL;
536 if (attribute == &noinline_ident)
537 return NULL;
538 if (attribute == &__used___ident)
539 return NULL;
540 if (attribute == &warn_unused_result_ident ||
541 attribute == &__warn_unused_result___ident)
542 return NULL;
543 if (attribute == &model_ident ||
544 attribute == &__model___ident)
545 return NULL;
546
547 return "unknown attribute";
548 }
549
550 static struct token *attribute_specifier(struct token *token, struct ctype *ctype)
551 {
552 ctype->modifiers = 0;
553 token = expect(token, '(', "after attribute");
554 token = expect(token, '(', "after attribute");
555
556 for (;;) {
557 const char *error_str;
558 struct ident *attribute_name;
559 struct expression *attribute_expr;
560
561 if (eof_token(token))
562 break;
563 if (match_op(token, ';'))
564 break;
565 if (token_type(token) != TOKEN_IDENT)
566 break;
567 attribute_name = token->ident;
568 token = token->next;
569 attribute_expr = NULL;
570 if (match_op(token, '('))
571 token = parens_expression(token, &attribute_expr, "in attribute");
572 error_str = handle_attribute(ctype, attribute_name, attribute_expr);
573 if (error_str)
574 sparse_error(token->pos, "attribute '%s': %s", show_ident(attribute_name), error_str);
575 if (!match_op(token, ','))
576 break;
577 token = token->next;
578 }
579
580 token = expect(token, ')', "after attribute");
581 token = expect(token, ')', "after attribute");
582 return token;
583 }
584
585 struct symbol * ctype_integer(unsigned long spec)
586 {
587 static struct symbol *const integer_ctypes[][3] = {
588 { &llong_ctype, &sllong_ctype, &ullong_ctype },
589 { &long_ctype, &slong_ctype, &ulong_ctype },
590 { &short_ctype, &sshort_ctype, &ushort_ctype },
591 { &char_ctype, &schar_ctype, &uchar_ctype },
592 { &int_ctype, &sint_ctype, &uint_ctype },
593 };
594 struct symbol *const (*ctype)[3];
595 int sub;
596
597 ctype = integer_ctypes;
598 if (!(spec & MOD_LONGLONG)) {
599 ctype++;
600 if (!(spec & MOD_LONG)) {
601 ctype++;
602 if (!(spec & MOD_SHORT)) {
603 ctype++;
604 if (!(spec & MOD_CHAR))
605 ctype++;
606 }
607 }
608 }
609
610 sub = ((spec & MOD_UNSIGNED)
611 ? 2
612 : ((spec & MOD_EXPLICITLY_SIGNED)
613 ? 1
614 : 0));
615
616 return ctype[0][sub];
617 }
618
619 struct symbol * ctype_fp(unsigned long spec)
620 {
621 if (spec & MOD_LONGLONG)
622 return &ldouble_ctype;
623 if (spec & MOD_LONG)
624 return &double_ctype;
625 return &float_ctype;
626 }
627
628 static void apply_ctype(struct position pos, struct ctype *thistype, struct ctype *ctype)
629 {
630 unsigned long mod = thistype->modifiers;
631
632 if (mod) {
633 unsigned long old = ctype->modifiers;
634 unsigned long extra = 0, dup, conflict;
635
636 if (mod & old & MOD_LONG) {
637 extra = MOD_LONGLONG | MOD_LONG;
638 mod &= ~MOD_LONG;
639 old &= ~MOD_LONG;
640 }
641 dup = (mod & old) | (extra & old) | (extra & mod);
642 if (dup)
643 sparse_error(pos, "Just how %sdo you want this type to be?",
644 modifier_string(dup));
645
646 conflict = !(~mod & ~old & (MOD_LONG | MOD_SHORT));
647 if (conflict)
648 sparse_error(pos, "You cannot have both long and short modifiers.");
649
650 conflict = !(~mod & ~old & (MOD_SIGNED | MOD_UNSIGNED));
651 if (conflict)
652 sparse_error(pos, "You cannot have both signed and unsigned modifiers.");
653
654 // Only one storage modifier allowed, except that "inline" doesn't count.
655 conflict = (mod | old) & (MOD_STORAGE & ~MOD_INLINE);
656 conflict &= (conflict - 1);
657 if (conflict)
658 sparse_error(pos, "multiple storage classes");
659
660 ctype->modifiers = old | mod | extra;
661 }
662
663 /* Context mask and value */
664 ctype->in_context += thistype->in_context;
665 ctype->out_context += thistype->out_context;
666
667 /* Alignment */
668 if (thistype->alignment & (thistype->alignment-1)) {
669 warning(pos, "I don't like non-power-of-2 alignments");
670 thistype->alignment = 0;
671 }
672 if (thistype->alignment > ctype->alignment)
673 ctype->alignment = thistype->alignment;
674
675 /* Address space */
676 if (thistype->as)
677 ctype->as = thistype->as;
678 }
679
680 static void check_modifiers(struct position *pos, struct symbol *s, unsigned long mod)
681 {
682 unsigned long banned, wrong;
683 unsigned long this_mod = s->ctype.modifiers;
684 const unsigned long BANNED_SIZE = MOD_LONG | MOD_LONGLONG | MOD_SHORT;
685 const unsigned long BANNED_SIGN = MOD_SIGNED | MOD_UNSIGNED;
686
687 if (this_mod & (MOD_STRUCTOF | MOD_UNIONOF | MOD_ENUMOF))
688 banned = BANNED_SIZE | BANNED_SIGN;
689 else if (this_mod & MOD_SPECIALBITS)
690 banned = 0;
691 else if (s->ctype.base_type == &fp_type)
692 banned = BANNED_SIGN;
693 else if (s->ctype.base_type == &int_type || !s->ctype.base_type || is_int_type (s))
694 banned = 0;
695 else {
696 // label_type
697 // void_type
698 // bad_type
699 // vector_type <-- whatever that is
700 banned = BANNED_SIZE | BANNED_SIGN;
701 }
702
703 wrong = mod & banned;
704 if (wrong)
705 sparse_error(*pos, "modifier %sis invalid in this context",
706 modifier_string (wrong));
707 }
708
709
710 static struct token *declaration_specifiers(struct token *next, struct ctype *ctype, int qual)
711 {
712 struct token *token;
713
714 while ( (token = next) != NULL ) {
715 struct ctype thistype;
716 struct ident *ident;
717 struct symbol *s, *type;
718 unsigned long mod;
719
720 next = token->next;
721 if (token_type(token) != TOKEN_IDENT)
722 break;
723 ident = token->ident;
724
725 s = lookup_symbol(ident, NS_TYPEDEF);
726 if (!s)
727 break;
728 thistype = s->ctype;
729 mod = thistype.modifiers;
730 if (qual && (mod & ~(MOD_ATTRIBUTE | MOD_CONST | MOD_VOLATILE)))
731 break;
732 if (mod & MOD_SPECIALBITS) {
733 if (mod & MOD_STRUCTOF)
734 next = struct_or_union_specifier(SYM_STRUCT, next, &thistype);
735 else if (mod & MOD_UNIONOF)
736 next = struct_or_union_specifier(SYM_UNION, next, &thistype);
737 else if (mod & MOD_ENUMOF)
738 next = enum_specifier(next, &thistype);
739 else if (mod & MOD_ATTRIBUTE)
740 next = attribute_specifier(next, &thistype);
741 else if (mod & MOD_TYPEOF)
742 next = typeof_specifier(next, &thistype);
743 mod = thistype.modifiers;
744 }
745 type = thistype.base_type;
746 if (type) {
747 if (qual)
748 break;
749 if (ctype->base_type)
750 break;
751 /* User types only mix with qualifiers */
752 if (mod & MOD_USERTYPE) {
753 if (ctype->modifiers & MOD_SPECIFIER)
754 break;
755 }
756 ctype->base_type = type;
757 }
758
759 check_modifiers(&token->pos, s, ctype->modifiers);
760 apply_ctype(token->pos, &thistype, ctype);
761 }
762
763 /* Turn the "virtual types" into real types with real sizes etc */
764 if (!ctype->base_type) {
765 struct symbol *base = &incomplete_ctype;
766
767 /*
768 * If we have modifiers, we'll default to an integer
769 * type, and "ctype_integer()" will turn this into
770 * a specific one.
771 */
772 if (ctype->modifiers & MOD_SPECIFIER)
773 base = &int_type;
774 ctype->base_type = base;
775 }
776 if (ctype->base_type == &int_type) {
777 ctype->base_type = ctype_integer(ctype->modifiers);
778 ctype->modifiers &= ~MOD_SPECIFIER;
779 } else if (ctype->base_type == &fp_type) {
780 ctype->base_type = ctype_fp(ctype->modifiers);
781 ctype->modifiers &= ~MOD_SPECIFIER;
782 }
783 if (ctype->modifiers & MOD_BITWISE) {
784 struct symbol *type;
785 ctype->modifiers &= ~(MOD_BITWISE | MOD_SPECIFIER);
786 if (!is_int_type(ctype->base_type)) {
787 sparse_error(token->pos, "invalid modifier");
788 return token;
789 }
790 type = alloc_symbol(token->pos, SYM_BASETYPE);
791 *type = *ctype->base_type;
792 type->ctype.base_type = ctype->base_type;
793 type->type = SYM_RESTRICT;
794 type->ctype.modifiers &= ~MOD_SPECIFIER;
795 ctype->base_type = type;
796 }
797 return token;
798 }
799
800 static struct token *abstract_array_declarator(struct token *token, struct symbol *sym)
801 {
802 struct expression *expr = NULL;
803
804 token = parse_expression(token, &expr);
805 sym->array_size = expr;
806 return token;
807 }
808
809 static struct token *parameter_type_list(struct token *, struct symbol *, struct ident **p);
810 static struct token *declarator(struct token *token, struct symbol *sym, struct ident **p);
811
812 static struct token *handle_attributes(struct token *token, struct ctype *ctype)
813 {
814 for (;;) {
815 if (token_type(token) != TOKEN_IDENT)
816 break;
817 if (match_idents(token, &__attribute___ident, &__attribute_ident, NULL)) {
818 struct ctype thistype = { 0, };
819 token = attribute_specifier(token->next, &thistype);
820 apply_ctype(token->pos, &thistype, ctype);
821 continue;
822 }
823 if (match_idents(token, &asm_ident, &__asm_ident, &__asm___ident)) {
824 struct expression *expr;
825 token = expect(token->next, '(', "after asm");
826 token = parse_expression(token->next, &expr);
827 token = expect(token, ')', "after asm");
828 continue;
829 }
830 break;
831 }
832 return token;
833 }
834
835 static struct token *direct_declarator(struct token *token, struct symbol *decl, struct ident **p)
836 {
837 struct ctype *ctype = &decl->ctype;
838
839 if (p && token_type(token) == TOKEN_IDENT) {
840 *p = token->ident;
841 token = token->next;
842 }
843
844 for (;;) {
845 token = handle_attributes(token, ctype);
846
847 if (token_type(token) != TOKEN_SPECIAL)
848 return token;
849
850 /*
851 * This can be either a parameter list or a grouping.
852 * For the direct (non-abstract) case, we know if must be
853 * a parameter list if we already saw the identifier.
854 * For the abstract case, we know if must be a parameter
855 * list if it is empty or starts with a type.
856 */
857 if (token->special == '(') {
858 struct symbol *sym;
859 struct token *next = token->next;
860 int fn = (p && *p) || match_op(next, ')') || lookup_type(next);
861
862 if (!fn) {
863 struct symbol *base_type = ctype->base_type;
864 token = declarator(next, decl, p);
865 token = expect(token, ')', "in nested declarator");
866 while (ctype->base_type != base_type)
867 ctype = &ctype->base_type->ctype;
868 p = NULL;
869 continue;
870 }
871
872 sym = indirect(token->pos, ctype, SYM_FN);
873 token = parameter_type_list(next, sym, p);
874 token = expect(token, ')', "in function declarator");
875 continue;
876 }
877 if (token->special == '[') {
878 struct symbol *array = indirect(token->pos, ctype, SYM_ARRAY);
879 token = abstract_array_declarator(token->next, array);
880 token = expect(token, ']', "in abstract_array_declarator");
881 ctype = &array->ctype;
882 continue;
883 }
884 break;
885 }
886 return token;
887 }
888
889 static struct token *pointer(struct token *token, struct ctype *ctype)
890 {
891 unsigned long modifiers;
892 struct symbol *base_type;
893
894 modifiers = ctype->modifiers & ~(MOD_TYPEDEF | MOD_ATTRIBUTE);
895 base_type = ctype->base_type;
896 ctype->modifiers = modifiers;
897
898 while (match_op(token,'*')) {
899 struct symbol *ptr = alloc_symbol(token->pos, SYM_PTR);
900 ptr->ctype.modifiers = modifiers & ~MOD_STORAGE;
901 ptr->ctype.as = ctype->as;
902 ptr->ctype.in_context += ctype->in_context;
903 ptr->ctype.out_context += ctype->out_context;
904 ptr->ctype.base_type = base_type;
905
906 base_type = ptr;
907 ctype->modifiers = modifiers & MOD_STORAGE;
908 ctype->base_type = base_type;
909 ctype->as = 0;
910 ctype->in_context = 0;
911 ctype->out_context = 0;
912
913 token = declaration_specifiers(token->next, ctype, 1);
914 modifiers = ctype->modifiers;
915 }
916 return token;
917 }
918
919 static struct token *declarator(struct token *token, struct symbol *sym, struct ident **p)
920 {
921 token = pointer(token, &sym->ctype);
922 return direct_declarator(token, sym, p);
923 }
924
925 static struct token *handle_bitfield(struct token *token, struct symbol *decl)
926 {
927 struct ctype *ctype = &decl->ctype;
928 struct expression *expr;
929 struct symbol *bitfield;
930 long long width;
931
932 if (!is_int_type(ctype->base_type)) {
933 sparse_error(token->pos, "invalid bitfield specifier for type %s.",
934 show_typename(ctype->base_type));
935 // Parse this to recover gracefully.
936 return conditional_expression(token->next, &expr);
937 }
938
939 bitfield = indirect(token->pos, ctype, SYM_BITFIELD);
940 token = conditional_expression(token->next, &expr);
941 width = get_expression_value(expr);
942 bitfield->bit_size = width;
943
944 if (width < 0 || width > INT_MAX) {
945 sparse_error(token->pos, "invalid bitfield width, %lld.", width);
946 width = -1;
947 } else if (decl->ident && width == 0) {
948 sparse_error(token->pos, "invalid named zero-width bitfield `%s'",
949 show_ident(decl->ident));
950 width = -1;
951 } else if (decl->ident) {
952 struct symbol *base_type = bitfield->ctype.base_type;
953 int is_signed = !(base_type->ctype.modifiers & MOD_UNSIGNED);
954 if (Wone_bit_signed_bitfield && width == 1 && is_signed) {
955 // Valid values are either {-1;0} or {0}, depending on integer
956 // representation. The latter makes for very efficient code...
957 sparse_error(token->pos, "dubious one-bit signed bitfield");
958 }
959 if (Wdefault_bitfield_sign &&
960 base_type->type != SYM_ENUM &&
961 !(base_type->ctype.modifiers & MOD_EXPLICITLY_SIGNED) &&
962 is_signed) {
963 // The sign of bitfields is unspecified by default.
964 sparse_error(token->pos, "dubious bitfield without explicit `signed' or `unsigned'");
965 }
966 }
967 bitfield->bit_size = width;
968 return token;
969 }
970
971 static struct token *declaration_list(struct token *token, struct symbol_list **list)
972 {
973 struct ctype ctype = {0, };
974
975 token = declaration_specifiers(token, &ctype, 0);
976 for (;;) {
977 struct ident *ident = NULL;
978 struct symbol *decl = alloc_symbol(token->pos, SYM_NODE);
979 decl->ctype = ctype;
980 token = declarator(token, decl, &ident);
981 decl->ident = ident;
982 if (match_op(token, ':')) {
983 token = handle_bitfield(token, decl);
984 token = handle_attributes(token, &decl->ctype);
985 }
986 add_symbol(list, decl);
987 if (!match_op(token, ','))
988 break;
989 token = token->next;
990 }
991 return token;
992 }
993
994 static struct token *struct_declaration_list(struct token *token, struct symbol_list **list)
995 {
996 while (!match_op(token, '}')) {
997 token = declaration_list(token, list);
998 if (!match_op(token, ';')) {
999 sparse_error(token->pos, "expected ; at end of declaration");
1000 break;
1001 }
1002 token = token->next;
1003 }
1004 return token;
1005 }
1006
1007 static struct token *parameter_declaration(struct token *token, struct symbol **tree)
1008 {
1009 struct ident *ident = NULL;
1010 struct symbol *sym;
1011 struct ctype ctype = { 0, };
1012
1013 token = declaration_specifiers(token, &ctype, 0);
1014 sym = alloc_symbol(token->pos, SYM_NODE);
1015 sym->ctype = ctype;
1016 *tree = sym;
1017 token = declarator(token, sym, &ident);
1018 sym->ident = ident;
1019 return token;
1020 }
1021
1022 struct token *typename(struct token *token, struct symbol **p)
1023 {
1024 struct symbol *sym = alloc_symbol(token->pos, SYM_NODE);
1025 *p = sym;
1026 token = declaration_specifiers(token, &sym->ctype, 0);
1027 return declarator(token, sym, NULL);
1028 }
1029
1030 static struct token *expression_statement(struct token *token, struct expression **tree)
1031 {
1032 token = parse_expression(token, tree);
1033 return expect(token, ';', "at end of statement");
1034 }
1035
1036 static struct token *parse_asm_operands(struct token *token, struct statement *stmt,
1037 struct expression_list **inout)
1038 {
1039 struct expression *expr;
1040
1041 /* Allow empty operands */
1042 if (match_op(token->next, ':') || match_op(token->next, ')'))
1043 return token->next;
1044 do {
1045 struct ident *ident = NULL;
1046 if (match_op(token->next, '[') &&
1047 token_type(token->next->next) == TOKEN_IDENT &&
1048 match_op(token->next->next->next, ']')) {
1049 ident = token->next->next->ident;
1050 token = token->next->next->next;
1051 }
1052 add_expression(inout, (struct expression *)ident); /* UGGLEE!!! */
1053 token = primary_expression(token->next, &expr);
1054 add_expression(inout, expr);
1055 token = parens_expression(token, &expr, "in asm parameter");
1056 add_expression(inout, expr);
1057 } while (match_op(token, ','));
1058 return token;
1059 }
1060
1061 static struct token *parse_asm_clobbers(struct token *token, struct statement *stmt,
1062 struct expression_list **clobbers)
1063 {
1064 struct expression *expr;
1065
1066 do {
1067 token = primary_expression(token->next, &expr);
1068 add_expression(clobbers, expr);
1069 } while (match_op(token, ','));
1070 return token;
1071 }
1072
1073 static struct token *parse_asm(struct token *token, struct statement *stmt)
1074 {
1075 stmt->type = STMT_ASM;
1076 if (match_idents(token, &__volatile___ident, &__volatile_ident, &volatile_ident, NULL)) {
1077 token = token->next;
1078 }
1079 token = expect(token, '(', "after asm");
1080 token = parse_expression(token, &stmt->asm_string);
1081 if (match_op(token, ':'))
1082 token = parse_asm_operands(token, stmt, &stmt->asm_outputs);
1083 if (match_op(token, ':'))
1084 token = parse_asm_operands(token, stmt, &stmt->asm_inputs);
1085 if (match_op(token, ':'))
1086 token = parse_asm_clobbers(token, stmt, &stmt->asm_clobbers);
1087 token = expect(token, ')', "after asm");
1088 return expect(token, ';', "at end of asm-statement");
1089 }
1090
1091 /* Make a statement out of an expression */
1092 static struct statement *make_statement(struct expression *expr)
1093 {
1094 struct statement *stmt;
1095
1096 if (!expr)
1097 return NULL;
1098 stmt = alloc_statement(expr->pos, STMT_EXPRESSION);
1099 stmt->expression = expr;
1100 return stmt;
1101 }
1102
1103 /*
1104 * All iterators have two symbols associated with them:
1105 * the "continue" and "break" symbols, which are targets
1106 * for continue and break statements respectively.
1107 *
1108 * They are in a special name-space, but they follow
1109 * all the normal visibility rules, so nested iterators
1110 * automatically work right.
1111 */
1112 static void start_iterator(struct statement *stmt)
1113 {
1114 struct symbol *cont, *brk;
1115
1116 start_symbol_scope();
1117 cont = alloc_symbol(stmt->pos, SYM_NODE);
1118 bind_symbol(cont, &continue_ident, NS_ITERATOR);
1119 brk = alloc_symbol(stmt->pos, SYM_NODE);
1120 bind_symbol(brk, &break_ident, NS_ITERATOR);
1121
1122 stmt->type = STMT_ITERATOR;
1123 stmt->iterator_break = brk;
1124 stmt->iterator_continue = cont;
1125 fn_local_symbol(brk);
1126 fn_local_symbol(cont);
1127 }
1128
1129 static void end_iterator(struct statement *stmt)
1130 {
1131 end_symbol_scope();
1132 }
1133
1134 static struct statement *start_function(struct symbol *sym)
1135 {
1136 struct symbol *ret;
1137 struct statement *stmt = alloc_statement(sym->pos, STMT_COMPOUND);
1138
1139 start_function_scope();
1140 ret = alloc_symbol(sym->pos, SYM_NODE);
1141 ret->ctype = sym->ctype.base_type->ctype;
1142 ret->ctype.modifiers &= ~(MOD_STORAGE | MOD_CONST | MOD_VOLATILE | MOD_INLINE | MOD_ADDRESSABLE | MOD_NOCAST | MOD_NODEREF | MOD_ACCESSED | MOD_TOPLEVEL);
1143 ret->ctype.modifiers |= (MOD_AUTO | MOD_REGISTER);
1144 bind_symbol(ret, &return_ident, NS_ITERATOR);
1145 stmt->ret = ret;
1146 fn_local_symbol(ret);
1147
1148 // Currently parsed symbol for __func__/__FUNCTION__/__PRETTY_FUNCTION__
1149 current_fn = sym;
1150
1151 return stmt;
1152 }
1153
1154 static void end_function(struct symbol *sym)
1155 {
1156 current_fn = NULL;
1157 end_function_scope();
1158 }
1159
1160 /*
1161 * A "switch()" statement, like an iterator, has a
1162 * the "break" symbol associated with it. It works
1163 * exactly like the iterator break - it's the target
1164 * for any break-statements in scope, and means that
1165 * "break" handling doesn't even need to know whether
1166 * it's breaking out of an iterator or a switch.
1167 *
1168 * In addition, the "case" symbol is a marker for the
1169 * case/default statements to find the switch statement
1170 * that they are associated with.
1171 */
1172 static void start_switch(struct statement *stmt)
1173 {
1174 struct symbol *brk, *switch_case;
1175
1176 start_symbol_scope();
1177 brk = alloc_symbol(stmt->pos, SYM_NODE);
1178 bind_symbol(brk, &break_ident, NS_ITERATOR);
1179
1180 switch_case = alloc_symbol(stmt->pos, SYM_NODE);
1181 bind_symbol(switch_case, &case_ident, NS_ITERATOR);
1182 switch_case->stmt = stmt;
1183
1184 stmt->type = STMT_SWITCH;
1185 stmt->switch_break = brk;
1186 stmt->switch_case = switch_case;
1187
1188 fn_local_symbol(brk);
1189 fn_local_symbol(switch_case);
1190 }
1191
1192 static void end_switch(struct statement *stmt)
1193 {
1194 if (!stmt->switch_case->symbol_list)
1195 warning(stmt->pos, "switch with no cases");
1196 end_symbol_scope();
1197 }
1198
1199 static void add_case_statement(struct statement *stmt)
1200 {
1201 struct symbol *target = lookup_symbol(&case_ident, NS_ITERATOR);
1202 struct symbol *sym;
1203
1204 if (!target) {
1205 sparse_error(stmt->pos, "not in switch scope");
1206 stmt->type = STMT_NONE;
1207 return;
1208 }
1209 sym = alloc_symbol(stmt->pos, SYM_NODE);
1210 add_symbol(&target->symbol_list, sym);
1211 sym->stmt = stmt;
1212 stmt->case_label = sym;
1213 fn_local_symbol(sym);
1214 }
1215
1216 static struct token *parse_return_statement(struct token *token, struct statement *stmt)
1217 {
1218 struct symbol *target = lookup_symbol(&return_ident, NS_ITERATOR);
1219
1220 if (!target)
1221 error_die(token->pos, "internal error: return without a function target");
1222 stmt->type = STMT_RETURN;
1223 stmt->ret_target = target;
1224 return expression_statement(token->next, &stmt->ret_value);
1225 }
1226
1227 static struct token *parse_for_statement(struct token *token, struct statement *stmt)
1228 {
1229 struct symbol_list *syms;
1230 struct expression *e1, *e2, *e3;
1231 struct statement *iterator;
1232
1233 start_iterator(stmt);
1234 token = expect(token->next, '(', "after 'for'");
1235
1236 syms = NULL;
1237 e1 = NULL;
1238 /* C99 variable declaration? */
1239 if (lookup_type(token)) {
1240 token = external_declaration(token, &syms);
1241 } else {
1242 token = parse_expression(token, &e1);
1243 token = expect(token, ';', "in 'for'");
1244 }
1245 token = parse_expression(token, &e2);
1246 token = expect(token, ';', "in 'for'");
1247 token = parse_expression(token, &e3);
1248 token = expect(token, ')', "in 'for'");
1249 token = statement(token, &iterator);
1250
1251 stmt->iterator_syms = syms;
1252 stmt->iterator_pre_statement = make_statement(e1);
1253 stmt->iterator_pre_condition = e2;
1254 stmt->iterator_post_statement = make_statement(e3);
1255 stmt->iterator_post_condition = NULL;
1256 stmt->iterator_statement = iterator;
1257 end_iterator(stmt);
1258
1259 return token;
1260 }
1261
1262 static struct token *parse_while_statement(struct token *token, struct statement *stmt)
1263 {
1264 struct expression *expr;
1265 struct statement *iterator;
1266
1267 start_iterator(stmt);
1268 token = parens_expression(token->next, &expr, "after 'while'");
1269 token = statement(token, &iterator);
1270
1271 stmt->iterator_pre_condition = expr;
1272 stmt->iterator_post_condition = NULL;
1273 stmt->iterator_statement = iterator;
1274 end_iterator(stmt);
1275
1276 return token;
1277 }
1278
1279 static struct token *parse_do_statement(struct token *token, struct statement *stmt)
1280 {
1281 struct expression *expr;
1282 struct statement *iterator;
1283
1284 start_iterator(stmt);
1285 token = statement(token->next, &iterator);
1286 if (token_type(token) == TOKEN_IDENT && token->ident == &while_ident)
1287 token = token->next;
1288 else
1289 sparse_error(token->pos, "expected 'while' after 'do'");
1290 token = parens_expression(token, &expr, "after 'do-while'");
1291
1292 stmt->iterator_post_condition = expr;
1293 stmt->iterator_statement = iterator;
1294 end_iterator(stmt);
1295
1296 return expect(token, ';', "after statement");
1297 }
1298
1299 static struct token *statement(struct token *token, struct statement **tree)
1300 {
1301 struct statement *stmt = alloc_statement(token->pos, STMT_NONE);
1302
1303 *tree = stmt;
1304 if (token_type(token) == TOKEN_IDENT) {
1305 if (token->ident == &if_ident) {
1306 stmt->type = STMT_IF;
1307 token = parens_expression(token->next, &stmt->if_conditional, "after if");
1308 token = statement(token, &stmt->if_true);
1309 if (token_type(token) != TOKEN_IDENT)
1310 return token;
1311 if (token->ident != &else_ident)
1312 return token;
1313 return statement(token->next, &stmt->if_false);
1314 }
1315
1316 if (token->ident == &return_ident)
1317 return parse_return_statement(token, stmt);
1318
1319 if (token->ident == &break_ident || token->ident == &continue_ident) {
1320 struct symbol *target = lookup_symbol(token->ident, NS_ITERATOR);
1321 stmt->type = STMT_GOTO;
1322 stmt->goto_label = target;
1323 if (!target)
1324 sparse_error(stmt->pos, "break/continue not in iterator scope");
1325 return expect(token->next, ';', "at end of statement");
1326 }
1327 if (token->ident == &default_ident) {
1328 token = token->next;
1329 goto default_statement;
1330 }
1331 if (token->ident == &case_ident) {
1332 token = parse_expression(token->next, &stmt->case_expression);
1333 if (match_op(token, SPECIAL_ELLIPSIS))
1334 token = parse_expression(token->next, &stmt->case_to);
1335 default_statement:
1336 stmt->type = STMT_CASE;
1337 token = expect(token, ':', "after default/case");
1338 add_case_statement(stmt);
1339 return statement(token, &stmt->case_statement);
1340 }
1341 if (token->ident == &switch_ident) {
1342 stmt->type = STMT_SWITCH;
1343 start_switch(stmt);
1344 token = parens_expression(token->next, &stmt->switch_expression, "after 'switch'");
1345 token = statement(token, &stmt->switch_statement);
1346 end_switch(stmt);
1347 return token;
1348 }
1349 if (token->ident == &for_ident)
1350 return parse_for_statement(token, stmt);
1351
1352 if (token->ident == &while_ident)
1353 return parse_while_statement(token, stmt);
1354
1355 if (token->ident == &do_ident)
1356 return parse_do_statement(token, stmt);
1357
1358 if (token->ident == &goto_ident) {
1359 stmt->type = STMT_GOTO;
1360 token = token->next;
1361 if (match_op(token, '*')) {
1362 token = parse_expression(token->next, &stmt->goto_expression);
1363 add_statement(&function_computed_goto_list, stmt);
1364 } else if (token_type(token) == TOKEN_IDENT) {
1365 stmt->goto_label = label_symbol(token);
1366 token = token->next;
1367 } else {
1368 sparse_error(token->pos, "Expected identifier or goto expression");
1369 }
1370 return expect(token, ';', "at end of statement");
1371 }
1372 if (match_idents(token, &asm_ident, &__asm___ident, &__asm_ident, NULL)) {
1373 return parse_asm(token->next, stmt);
1374 }
1375 if (token->ident == &__context___ident) {
1376 stmt->type = STMT_CONTEXT;
1377 token = parse_expression(token->next, &stmt->expression);
1378 return expect(token, ';', "at end of statement");
1379 }
1380 if (token->ident == &__range___ident) {
1381 stmt->type = STMT_RANGE;
1382 token = assignment_expression(token->next, &stmt->range_expression);
1383 token = expect(token, ',', "after range expression");
1384 token = assignment_expression(token, &stmt->range_low);
1385 token = expect(token, ',', "after low range");
1386 token = assignment_expression(token, &stmt->range_high);
1387 return expect(token, ';', "after range statement");
1388 }
1389 if (match_op(token->next, ':')) {
1390 stmt->type = STMT_LABEL;
1391 stmt->label_identifier = label_symbol(token);
1392 return statement(token->next->next, &stmt->label_statement);
1393 }
1394 }
1395
1396 if (match_op(token, '{')) {
1397 stmt->type = STMT_COMPOUND;
1398 start_symbol_scope();
1399 token = compound_statement(token->next, stmt);
1400 end_symbol_scope();
1401
1402 return expect(token, '}', "at end of compound statement");
1403 }
1404
1405 stmt->type = STMT_EXPRESSION;
1406 return expression_statement(token, &stmt->expression);
1407 }
1408
1409 static struct token * statement_list(struct token *token, struct statement_list **list, struct symbol_list **syms)
1410 {
1411 for (;;) {
1412 struct statement * stmt;
1413 if (eof_token(token))
1414 break;
1415 if (match_op(token, '}'))
1416 break;
1417 if (lookup_type(token)) {
1418 if (warn_on_mixed && *list)
1419 warning(token->pos, "mixing declarations and code");
1420 token = external_declaration(token, syms);
1421 continue;
1422 }
1423 token = statement(token, &stmt);
1424 add_statement(list, stmt);
1425 }
1426 return token;
1427 }
1428
1429 static struct token *parameter_type_list(struct token *token, struct symbol *fn, struct ident **p)
1430 {
1431 struct symbol_list **list = &fn->arguments;
1432
1433 if (match_op(token, ')')) {
1434 // No warning for "void oink ();"
1435 // Bug or feature: warns for "void oink () __attribute__ ((noreturn));"
1436 if (p && !match_op(token->next, ';'))
1437 warning(token->pos, "non-ANSI function declaration of function '%s'", show_ident(*p));
1438 return token;
1439 }
1440
1441 for (;;) {
1442 struct symbol *sym;
1443
1444 if (match_op(token, SPECIAL_ELLIPSIS)) {
1445 if (!*list)
1446 warning(token->pos, "variadic functions must have one named argument");
1447 fn->variadic = 1;
1448 token = token->next;
1449 break;
1450 }
1451
1452 sym = alloc_symbol(token->pos, SYM_NODE);
1453 token = parameter_declaration(token, &sym);
1454 if (sym->ctype.base_type == &void_ctype) {
1455 /* Special case: (void) */
1456 if (!*list && !sym->ident)
1457 break;
1458 warning(token->pos, "void parameter");
1459 }
1460 add_symbol(list, sym);
1461 if (!match_op(token, ','))
1462 break;
1463 token = token->next;
1464
1465 }
1466 return token;
1467 }
1468
1469 struct token *compound_statement(struct token *token, struct statement *stmt)
1470 {
1471 token = statement_list(token, &stmt->stmts, &stmt->syms);
1472 return token;
1473 }
1474
1475 static struct expression *identifier_expression(struct token *token)
1476 {
1477 struct expression *expr = alloc_expression(token->pos, EXPR_IDENTIFIER);
1478 expr->expr_ident = token->ident;
1479 return expr;
1480 }
1481
1482 static struct expression *index_expression(struct expression *from, struct expression *to)
1483 {
1484 int idx_from, idx_to;
1485 struct expression *expr = alloc_expression(from->pos, EXPR_INDEX);
1486
1487 idx_from = get_expression_value(from);
1488 idx_to = idx_from;
1489 if (to) {
1490 idx_to = get_expression_value(to);
1491 if (idx_to < idx_from || idx_from < 0)
1492 warning(from->pos, "nonsense array initializer index range");
1493 }
1494 expr->idx_from = idx_from;
1495 expr->idx_to = idx_to;
1496 return expr;
1497 }
1498
1499 static struct token *single_initializer(struct expression **ep, struct token *token)
1500 {
1501 int expect_equal = 0;
1502 struct token *next = token->next;
1503 struct expression **tail = ep;
1504 int nested;
1505
1506 *ep = NULL;
1507
1508 if ((token_type(token) == TOKEN_IDENT) && match_op(next, ':')) {
1509 struct expression *expr = identifier_expression(token);
1510 warning(token->pos, "obsolete struct initializer, use C99 syntax");
1511 token = initializer(&expr->ident_expression, next->next);
1512 if (expr->ident_expression)
1513 *ep = expr;
1514 return token;
1515 }
1516
1517 for (tail = ep, nested = 0; ; nested++, next = token->next) {
1518 if (match_op(token, '.') && (token_type(next) == TOKEN_IDENT)) {
1519 struct expression *expr = identifier_expression(next);
1520 *tail = expr;
1521 tail = &expr->ident_expression;
1522 expect_equal = 1;
1523 token = next->next;
1524 } else if (match_op(token, '[')) {
1525 struct expression *from = NULL, *to = NULL, *expr;
1526 token = constant_expression(token->next, &from);
1527 if (!from) {
1528 sparse_error(token->pos, "Expected constant expression");
1529 break;
1530 }
1531 if (match_op(token, SPECIAL_ELLIPSIS))
1532 token = constant_expression(token->next, &to);
1533 expr = index_expression(from, to);
1534 *tail = expr;
1535 tail = &expr->idx_expression;
1536 token = expect(token, ']', "at end of initializer index");
1537 if (nested)
1538 expect_equal = 1;
1539 } else {
1540 break;
1541 }
1542 }
1543 if (nested && !expect_equal) {
1544 if (!match_op(token, '='))
1545 warning(token->pos, "obsolete array initializer, use C99 syntax");
1546 else
1547 expect_equal = 1;
1548 }
1549 if (expect_equal)
1550 token = expect(token, '=', "at end of initializer index");
1551
1552 token = initializer(tail, token);
1553 if (!*tail)
1554 *ep = NULL;
1555 return token;
1556 }
1557
1558 static struct token *initializer_list(struct expression_list **list, struct token *token)
1559 {
1560 struct expression *expr;
1561
1562 for (;;) {
1563 token = single_initializer(&expr, token);
1564 if (!expr)
1565 break;
1566 add_expression(list, expr);
1567 if (!match_op(token, ','))
1568 break;
1569 token = token->next;
1570 }
1571 return token;
1572 }
1573
1574 struct token *initializer(struct expression **tree, struct token *token)
1575 {
1576 if (match_op(token, '{')) {
1577 struct expression *expr = alloc_expression(token->pos, EXPR_INITIALIZER);
1578 *tree = expr;
1579 token = initializer_list(&expr->expr_list, token->next);
1580 return expect(token, '}', "at end of initializer");
1581 }
1582 return assignment_expression(token, tree);
1583 }
1584
1585 static void declare_argument(struct symbol *sym, struct symbol *fn)
1586 {
1587 if (!sym->ident) {
1588 sparse_error(sym->pos, "no identifier for function argument");
1589 return;
1590 }
1591 bind_symbol(sym, sym->ident, NS_SYMBOL);
1592 }
1593
1594 static struct token *parse_function_body(struct token *token, struct symbol *decl,
1595 struct symbol_list **list)
1596 {
1597 struct symbol_list **old_symbol_list;
1598 struct symbol *base_type = decl->ctype.base_type;
1599 struct statement *stmt, **p;
1600 struct symbol *arg;
1601
1602 old_symbol_list = function_symbol_list;
1603 if (decl->ctype.modifiers & MOD_INLINE) {
1604 function_symbol_list = &decl->inline_symbol_list;
1605 p = &base_type->inline_stmt;
1606 } else {
1607 function_symbol_list = &decl->symbol_list;
1608 p = &base_type->stmt;
1609 }
1610 function_computed_target_list = NULL;
1611 function_computed_goto_list = NULL;
1612
1613 if (decl->ctype.modifiers & MOD_EXTERN) {
1614 if (!(decl->ctype.modifiers & MOD_INLINE))
1615 warning(decl->pos, "function '%s' with external linkage has definition", show_ident(decl->ident));
1616 }
1617 if (!(decl->ctype.modifiers & MOD_STATIC))
1618 decl->ctype.modifiers |= MOD_EXTERN;
1619
1620 stmt = start_function(decl);
1621
1622 *p = stmt;
1623 FOR_EACH_PTR (base_type->arguments, arg) {
1624 declare_argument(arg, base_type);
1625 } END_FOR_EACH_PTR(arg);
1626
1627 token = compound_statement(token->next, stmt);
1628
1629 end_function(decl);
1630 if (!(decl->ctype.modifiers & MOD_INLINE))
1631 add_symbol(list, decl);
1632 check_declaration(decl);
1633 function_symbol_list = old_symbol_list;
1634 if (function_computed_goto_list) {
1635 if (!function_computed_target_list)
1636 warning(decl->pos, "function '%s' has computed goto but no targets?", show_ident(decl->ident));
1637 else {
1638 struct statement *stmt;
1639 FOR_EACH_PTR(function_computed_goto_list, stmt) {
1640 stmt->target_list = function_computed_target_list;
1641 } END_FOR_EACH_PTR(stmt);
1642 }
1643 }
1644 return expect(token, '}', "at end of function");
1645 }
1646
1647 static void promote_k_r_types(struct symbol *arg)
1648 {
1649 struct symbol *base = arg->ctype.base_type;
1650 if (base && base->ctype.base_type == &int_type && (base->ctype.modifiers & (MOD_CHAR | MOD_SHORT))) {
1651 arg->ctype.base_type = &int_ctype;
1652 }
1653 }
1654
1655 static void apply_k_r_types(struct symbol_list *argtypes, struct symbol *fn)
1656 {
1657 struct symbol_list *real_args = fn->ctype.base_type->arguments;
1658 struct symbol *arg;
1659
1660 FOR_EACH_PTR(real_args, arg) {
1661 struct symbol *type;
1662
1663 /* This is quadratic in the number of arguments. We _really_ don't care */
1664 FOR_EACH_PTR(argtypes, type) {
1665 if (type->ident == arg->ident)
1666 goto match;
1667 } END_FOR_EACH_PTR(type);
1668 sparse_error(arg->pos, "missing type declaration for parameter '%s'", show_ident(arg->ident));
1669 continue;
1670 match:
1671 type->used = 1;
1672 /* "char" and "short" promote to "int" */
1673 promote_k_r_types(type);
1674
1675 arg->ctype = type->ctype;
1676 } END_FOR_EACH_PTR(arg);
1677
1678 FOR_EACH_PTR(argtypes, arg) {
1679 if (!arg->used)
1680 warning(arg->pos, "nonsensical parameter declaration '%s'", show_ident(arg->ident));
1681 } END_FOR_EACH_PTR(arg);
1682
1683 }
1684
1685 static struct token *parse_k_r_arguments(struct token *token, struct symbol *decl,
1686 struct symbol_list **list)
1687 {
1688 struct symbol_list *args = NULL;
1689
1690 warning(token->pos, "non-ANSI definition of function '%s'", show_ident(decl->ident));
1691 do {
1692 token = declaration_list(token, &args);
1693 if (!match_op(token, ';')) {
1694 sparse_error(token->pos, "expected ';' at end of parameter declaration");
1695 break;
1696 }
1697 token = token->next;
1698 } while (lookup_type(token));
1699
1700 apply_k_r_types(args, decl);
1701
1702 if (!match_op(token, '{')) {
1703 sparse_error(token->pos, "expected function body");
1704 return token;
1705 }
1706 return parse_function_body(token, decl, list);
1707 }
1708
1709
1710 struct token *external_declaration(struct token *token, struct symbol_list **list)
1711 {
1712 struct ident *ident = NULL;
1713 struct symbol *decl;
1714 struct ctype ctype = { 0, };
1715 struct symbol *base_type;
1716 int is_typedef;
1717
1718 /* Top-level inline asm? */
1719 if (match_idents(token, &asm_ident, &__asm___ident, &__asm_ident, NULL)) {
1720 struct symbol *anon = alloc_symbol(token->pos, SYM_NODE);
1721 struct symbol *fn = alloc_symbol(token->pos, SYM_FN);
1722 struct statement *stmt;
1723
1724 anon->ctype.base_type = fn;
1725 stmt = alloc_statement(token->pos, STMT_NONE);
1726 fn->stmt = stmt;
1727
1728 token = parse_asm(token->next, stmt);
1729
1730 add_symbol(list, anon);
1731 return token;
1732 }
1733
1734 /* Parse declaration-specifiers, if any */
1735 token = declaration_specifiers(token, &ctype, 0);
1736 decl = alloc_symbol(token->pos, SYM_NODE);
1737 decl->ctype = ctype;
1738 token = declarator(token, decl, &ident);
1739
1740 /* Just a type declaration? */
1741 if (!ident)
1742 return expect(token, ';', "end of type declaration");
1743
1744 /* type define declaration? */
1745 is_typedef = (ctype.modifiers & MOD_TYPEDEF) != 0;
1746
1747 /* Typedef's don't have meaningful storage */
1748 if (is_typedef) {
1749 ctype.modifiers &= ~MOD_STORAGE;
1750 decl->ctype.modifiers &= ~MOD_STORAGE;
1751 decl->ctype.modifiers |= MOD_USERTYPE;
1752 }
1753
1754 bind_symbol(decl, ident, is_typedef ? NS_TYPEDEF: NS_SYMBOL);
1755
1756 base_type = decl->ctype.base_type;
1757
1758 if (is_typedef) {
1759 if (base_type && !base_type->ident)
1760 base_type->ident = ident;
1761 } else if (base_type && base_type->type == SYM_FN) {
1762 /* K&R argument declaration? */
1763 if (lookup_type(token))
1764 return parse_k_r_arguments(token, decl, list);
1765 if (match_op(token, '{'))
1766 return parse_function_body(token, decl, list);
1767
1768 if (!(decl->ctype.modifiers & MOD_STATIC))
1769 decl->ctype.modifiers |= MOD_EXTERN;
1770 } else if (base_type == &void_ctype && !(decl->ctype.modifiers & MOD_EXTERN)) {
1771 sparse_error(token->pos, "void declaration");
1772 }
1773
1774 for (;;) {
1775 if (!is_typedef && match_op(token, '=')) {
1776 if (decl->ctype.modifiers & MOD_EXTERN) {
1777 warning(decl->pos, "symbol with external linkage has initializer");
1778 decl->ctype.modifiers &= ~MOD_EXTERN;
1779 }
1780 token = initializer(&decl->initializer, token->next);
1781 }
1782 if (!is_typedef) {
1783 if (!(decl->ctype.modifiers & (MOD_EXTERN | MOD_INLINE))) {
1784 add_symbol(list, decl);
1785 fn_local_symbol(decl);
1786 }
1787 }
1788 check_declaration(decl);
1789
1790 if (!match_op(token, ','))
1791 break;
1792
1793 token = token->next;
1794 ident = NULL;
1795 decl = alloc_symbol(token->pos, SYM_NODE);
1796 decl->ctype = ctype;
1797 token = declaration_specifiers(token, &decl->ctype, 1);
1798 token = declarator(token, decl, &ident);
1799 if (!ident) {
1800 sparse_error(token->pos, "expected identifier name in type definition");
1801 return token;
1802 }
1803
1804 bind_symbol(decl, ident, is_typedef ? NS_TYPEDEF: NS_SYMBOL);
1805
1806 /* Function declarations are automatically extern unless specifically static */
1807 base_type = decl->ctype.base_type;
1808 if (!is_typedef && base_type && base_type->type == SYM_FN) {
1809 if (!(decl->ctype.modifiers & MOD_STATIC))
1810 decl->ctype.modifiers |= MOD_EXTERN;
1811 }
1812 }
1813 return expect(token, ';', "at end of declaration");
1814 }
Static analysis for C