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[PATCH] tie the fields of struct in simple list
[smatch.git] / parse.c
blobcfbf190260e25531983e6387d54b533b1ceb6111
1 /*
2 * Stupid C parser, version 1e-6.
3 *
4 * Let's see how hard this is to do.
5 *
6 * Copyright (C) 2003 Transmeta Corp.
7 * 2003-2004 Linus Torvalds
8 * Copyright (C) 2004 Christopher Li
9 *
10 * Licensed under the Open Software License version 1.1
11 */
12
13 #include <stdarg.h>
14 #include <stdlib.h>
15 #include <stdio.h>
16 #include <string.h>
17 #include <ctype.h>
18 #include <unistd.h>
19 #include <fcntl.h>
20 #include <limits.h>
21
22 #include "lib.h"
23 #include "allocate.h"
24 #include "token.h"
25 #include "parse.h"
26 #include "symbol.h"
27 #include "scope.h"
28 #include "expression.h"
29 #include "target.h"
30
31 #define warn_on_mixed (1)
32
33 static struct symbol_list **function_symbol_list;
34 struct symbol_list *function_computed_target_list;
35 struct statement_list *function_computed_goto_list;
36
37 static struct token *statement(struct token *token, struct statement **tree);
38 static struct token *handle_attributes(struct token *token, struct ctype *ctype, unsigned int keywords);
39
40 static struct token *struct_specifier(struct token *token, struct ctype *ctype);
41 static struct token *union_specifier(struct token *token, struct ctype *ctype);
42 static struct token *enum_specifier(struct token *token, struct ctype *ctype);
43 static struct token *attribute_specifier(struct token *token, struct ctype *ctype);
44 static struct token *typeof_specifier(struct token *token, struct ctype *ctype);
45
46 static struct token *parse_if_statement(struct token *token, struct statement *stmt);
47 static struct token *parse_return_statement(struct token *token, struct statement *stmt);
48 static struct token *parse_loop_iterator(struct token *token, struct statement *stmt);
49 static struct token *parse_default_statement(struct token *token, struct statement *stmt);
50 static struct token *parse_case_statement(struct token *token, struct statement *stmt);
51 static struct token *parse_switch_statement(struct token *token, struct statement *stmt);
52 static struct token *parse_for_statement(struct token *token, struct statement *stmt);
53 static struct token *parse_while_statement(struct token *token, struct statement *stmt);
54 static struct token *parse_do_statement(struct token *token, struct statement *stmt);
55 static struct token *parse_goto_statement(struct token *token, struct statement *stmt);
56 static struct token *parse_context_statement(struct token *token, struct statement *stmt);
57 static struct token *parse_range_statement(struct token *token, struct statement *stmt);
58 static struct token *parse_asm_statement(struct token *token, struct statement *stmt);
59 static struct token *toplevel_asm_declaration(struct token *token, struct symbol_list **list);
60 static struct token *parse_asm_declarator(struct token *token, struct ctype *ctype);
61
62
63 static struct token *attribute_packed(struct token *token, struct symbol *attr, struct ctype *ctype);
64 static struct token *attribute_modifier(struct token *token, struct symbol *attr, struct ctype *ctype);
65 static struct token *attribute_address_space(struct token *token, struct symbol *attr, struct ctype *ctype);
66 static struct token *attribute_aligned(struct token *token, struct symbol *attr, struct ctype *ctype);
67 static struct token *attribute_mode(struct token *token, struct symbol *attr, struct ctype *ctype);
68 static struct token *attribute_context(struct token *token, struct symbol *attr, struct ctype *ctype);
69 static struct token *attribute_transparent_union(struct token *token, struct symbol *attr, struct ctype *ctype);
70 static struct token *ignore_attribute(struct token *token, struct symbol *attr, struct ctype *ctype);
71
72
73 static struct symbol_op modifier_op = {
74 .type = KW_MODIFIER,
75 };
76
77 static struct symbol_op qualifier_op = {
78 .type = KW_QUALIFIER,
79 };
80
81 static struct symbol_op typeof_op = {
82 .type = KW_TYPEOF,
83 .declarator = typeof_specifier,
84 };
85
86 static struct symbol_op attribute_op = {
87 .type = KW_ATTRIBUTE,
88 .declarator = attribute_specifier,
89 };
90
91 static struct symbol_op struct_op = {
92 .type = KW_SPECIFIER,
93 .declarator = struct_specifier,
94 };
95
96 static struct symbol_op union_op = {
97 .type = KW_SPECIFIER,
98 .declarator = union_specifier,
99 };
100
101 static struct symbol_op enum_op = {
102 .type = KW_SPECIFIER,
103 .declarator = enum_specifier,
104 };
105
106
107
108 static struct symbol_op if_op = {
109 .statement = parse_if_statement,
110 };
111
112 static struct symbol_op return_op = {
113 .statement = parse_return_statement,
114 };
115
116 static struct symbol_op loop_iter_op = {
117 .statement = parse_loop_iterator,
118 };
119
120 static struct symbol_op default_op = {
121 .statement = parse_default_statement,
122 };
123
124 static struct symbol_op case_op = {
125 .statement = parse_case_statement,
126 };
127
128 static struct symbol_op switch_op = {
129 .statement = parse_switch_statement,
130 };
131
132 static struct symbol_op for_op = {
133 .statement = parse_for_statement,
134 };
135
136 static struct symbol_op while_op = {
137 .statement = parse_while_statement,
138 };
139
140 static struct symbol_op do_op = {
141 .statement = parse_do_statement,
142 };
143
144 static struct symbol_op goto_op = {
145 .statement = parse_goto_statement,
146 };
147
148 static struct symbol_op __context___op = {
149 .statement = parse_context_statement,
150 };
151
152 static struct symbol_op range_op = {
153 .statement = parse_range_statement,
154 };
155
156 static struct symbol_op asm_op = {
157 .type = KW_ASM,
158 .declarator = parse_asm_declarator,
159 .statement = parse_asm_statement,
160 .toplevel = toplevel_asm_declaration,
161 };
162
163 static struct symbol_op packed_op = {
164 .attribute = attribute_packed,
165 };
166
167 static struct symbol_op aligned_op = {
168 .attribute = attribute_aligned,
169 };
170
171 static struct symbol_op attr_mod_op = {
172 .attribute = attribute_modifier,
173 };
174
175 static struct symbol_op address_space_op = {
176 .attribute = attribute_address_space,
177 };
178
179 static struct symbol_op mode_op = {
180 .attribute = attribute_mode,
181 };
182
183 static struct symbol_op context_op = {
184 .attribute = attribute_context,
185 };
186
187 static struct symbol_op transparent_union_op = {
188 .attribute = attribute_transparent_union,
189 };
190
191 static struct symbol_op ignore_attr_op = {
192 .attribute = ignore_attribute,
193 };
194
195 static struct symbol_op mode_spec_op = {
196 .type = KW_MODE,
197 };
198
199 static struct init_keyword {
200 const char *name;
201 enum namespace ns;
202 unsigned long modifiers;
203 struct symbol_op *op;
204 } keyword_table[] = {
205 /* Type qualifiers */
206 { "const", NS_TYPEDEF, MOD_CONST, .op = &qualifier_op },
207 { "__const", NS_TYPEDEF, MOD_CONST, .op = &qualifier_op },
208 { "__const__", NS_TYPEDEF, MOD_CONST, .op = &qualifier_op },
209 { "volatile", NS_TYPEDEF, MOD_VOLATILE, .op = &qualifier_op },
210 { "__volatile", NS_TYPEDEF, MOD_VOLATILE, .op = &qualifier_op },
211 { "__volatile__", NS_TYPEDEF, MOD_VOLATILE, .op = &qualifier_op },
212
213 /* Typedef.. */
214 { "typedef", NS_TYPEDEF, MOD_TYPEDEF, .op = &modifier_op },
215
216 /* Extended types */
217 { "typeof", NS_TYPEDEF, .op = &typeof_op },
218 { "__typeof", NS_TYPEDEF, .op = &typeof_op },
219 { "__typeof__", NS_TYPEDEF, .op = &typeof_op },
220
221 { "__attribute", NS_TYPEDEF, .op = &attribute_op },
222 { "__attribute__", NS_TYPEDEF, .op = &attribute_op },
223
224 { "struct", NS_TYPEDEF, .op = &struct_op },
225 { "union", NS_TYPEDEF, .op = &union_op },
226 { "enum", NS_TYPEDEF, .op = &enum_op },
227
228 { "inline", NS_TYPEDEF, MOD_INLINE, .op = &modifier_op },
229 { "__inline", NS_TYPEDEF, MOD_INLINE, .op = &modifier_op },
230 { "__inline__", NS_TYPEDEF, MOD_INLINE, .op = &modifier_op },
231
232 /* Ignored for now.. */
233 { "restrict", NS_TYPEDEF, .op = &qualifier_op},
234 { "__restrict", NS_TYPEDEF, .op = &qualifier_op},
235
236 /* Statement */
237 { "if", NS_KEYWORD, .op = &if_op },
238 { "return", NS_KEYWORD, .op = &return_op },
239 { "break", NS_KEYWORD, .op = &loop_iter_op },
240 { "continue", NS_KEYWORD, .op = &loop_iter_op },
241 { "default", NS_KEYWORD, .op = &default_op },
242 { "case", NS_KEYWORD, .op = &case_op },
243 { "switch", NS_KEYWORD, .op = &switch_op },
244 { "for", NS_KEYWORD, .op = &for_op },
245 { "while", NS_KEYWORD, .op = &while_op },
246 { "do", NS_KEYWORD, .op = &do_op },
247 { "goto", NS_KEYWORD, .op = &goto_op },
248 { "__context__",NS_KEYWORD, .op = &__context___op },
249 { "__range__", NS_KEYWORD, .op = &range_op },
250 { "asm", NS_KEYWORD, .op = &asm_op },
251 { "__asm", NS_KEYWORD, .op = &asm_op },
252 { "__asm__", NS_KEYWORD, .op = &asm_op },
253
254 /* Attribute */
255 { "packed", NS_KEYWORD, .op = &packed_op },
256 { "__packed__", NS_KEYWORD, .op = &packed_op },
257 { "aligned", NS_KEYWORD, .op = &aligned_op },
258 { "__aligned__",NS_KEYWORD, .op = &aligned_op },
259 { "nocast", NS_KEYWORD, MOD_NOCAST, .op = &attr_mod_op },
260 { "noderef", NS_KEYWORD, MOD_NODEREF, .op = &attr_mod_op },
261 { "safe", NS_KEYWORD, MOD_SAFE, .op = &attr_mod_op },
262 { "force", NS_KEYWORD, MOD_FORCE, .op = &attr_mod_op },
263 { "bitwise", NS_KEYWORD, MOD_BITWISE, .op = &attr_mod_op },
264 { "__bitwise__",NS_KEYWORD, MOD_BITWISE, .op = &attr_mod_op },
265 { "address_space",NS_KEYWORD, .op = &address_space_op },
266 { "mode", NS_KEYWORD, .op = &mode_op },
267 { "context", NS_KEYWORD, .op = &context_op },
268 { "__transparent_union__", NS_KEYWORD, .op = &transparent_union_op },
269
270 { "__mode__", NS_KEYWORD, .op = &mode_op },
271 { "QI", NS_KEYWORD, MOD_CHAR, .op = &mode_spec_op },
272 { "__QI__", NS_KEYWORD, MOD_CHAR, .op = &mode_spec_op },
273 { "HI", NS_KEYWORD, MOD_SHORT, .op = &mode_spec_op },
274 { "__HI__", NS_KEYWORD, MOD_SHORT, .op = &mode_spec_op },
275 { "SI", NS_KEYWORD, .op = &mode_spec_op },
276 { "__SI__", NS_KEYWORD, .op = &mode_spec_op },
277 { "DI", NS_KEYWORD, MOD_LONGLONG, .op = &mode_spec_op },
278 { "__DI__", NS_KEYWORD, MOD_LONGLONG, .op = &mode_spec_op },
279 { "word", NS_KEYWORD, MOD_LONG, .op = &mode_spec_op },
280 { "__word__", NS_KEYWORD, MOD_LONG, .op = &mode_spec_op },
281
282 /* Ignored attributes */
283 { "nothrow", NS_KEYWORD, .op = &ignore_attr_op },
284 { "__nothrow", NS_KEYWORD, .op = &ignore_attr_op },
285 { "__nothrow__", NS_KEYWORD, .op = &ignore_attr_op },
286 { "__malloc__", NS_KEYWORD, .op = &ignore_attr_op },
287 { "nonnull", NS_KEYWORD, .op = &ignore_attr_op },
288 { "__nonnull", NS_KEYWORD, .op = &ignore_attr_op },
289 { "__nonnull__", NS_KEYWORD, .op = &ignore_attr_op },
290 { "format", NS_KEYWORD, .op = &ignore_attr_op },
291 { "__format__", NS_KEYWORD, .op = &ignore_attr_op },
292 { "format_arg", NS_KEYWORD, .op = &ignore_attr_op },
293 { "__format_arg__", NS_KEYWORD, .op = &ignore_attr_op },
294 { "section", NS_KEYWORD, .op = &ignore_attr_op },
295 { "__section__",NS_KEYWORD, .op = &ignore_attr_op },
296 { "unused", NS_KEYWORD, .op = &ignore_attr_op },
297 { "__unused__", NS_KEYWORD, .op = &ignore_attr_op },
298 { "const", NS_KEYWORD, .op = &ignore_attr_op },
299 { "__const", NS_KEYWORD, .op = &ignore_attr_op },
300 { "__const__", NS_KEYWORD, .op = &ignore_attr_op },
301 { "noreturn", NS_KEYWORD, .op = &ignore_attr_op },
302 { "__noreturn__", NS_KEYWORD, .op = &ignore_attr_op },
303 { "no_instrument_function", NS_KEYWORD, .op = &ignore_attr_op },
304 { "__no_instrument_function__", NS_KEYWORD, .op = &ignore_attr_op },
305 { "sentinel", NS_KEYWORD, .op = &ignore_attr_op },
306 { "__sentinel__", NS_KEYWORD, .op = &ignore_attr_op },
307 { "regparm", NS_KEYWORD, .op = &ignore_attr_op },
308 { "__regparm__", NS_KEYWORD, .op = &ignore_attr_op },
309 { "weak", NS_KEYWORD, .op = &ignore_attr_op },
310 { "__weak__", NS_KEYWORD, .op = &ignore_attr_op },
311 { "alias", NS_KEYWORD, .op = &ignore_attr_op },
312 { "__alias__", NS_KEYWORD, .op = &ignore_attr_op },
313 { "pure", NS_KEYWORD, .op = &ignore_attr_op },
314 { "__pure__", NS_KEYWORD, .op = &ignore_attr_op },
315 { "always_inline", NS_KEYWORD, .op = &ignore_attr_op },
316 { "__always_inline__", NS_KEYWORD, .op = &ignore_attr_op },
317 { "syscall_linkage", NS_KEYWORD, .op = &ignore_attr_op },
318 { "__syscall_linkage__", NS_KEYWORD, .op = &ignore_attr_op },
319 { "visibility", NS_KEYWORD, .op = &ignore_attr_op },
320 { "__visibility__", NS_KEYWORD, .op = &ignore_attr_op },
321 { "deprecated", NS_KEYWORD, .op = &ignore_attr_op },
322 { "__deprecated__", NS_KEYWORD, .op = &ignore_attr_op },
323 { "noinline", NS_KEYWORD, .op = &ignore_attr_op },
324 { "__noinline__", NS_KEYWORD, .op = &ignore_attr_op },
325 { "used", NS_KEYWORD, .op = &ignore_attr_op },
326 { "__used__", NS_KEYWORD, .op = &ignore_attr_op },
327 { "warn_unused_result", NS_KEYWORD, .op = &ignore_attr_op },
328 { "__warn_unused_result__", NS_KEYWORD, .op = &ignore_attr_op },
329 { "model", NS_KEYWORD, .op = &ignore_attr_op },
330 { "__model__", NS_KEYWORD, .op = &ignore_attr_op },
331 { "cdecl", NS_KEYWORD, .op = &ignore_attr_op },
332 { "__cdecl__", NS_KEYWORD, .op = &ignore_attr_op },
333 { "stdcall", NS_KEYWORD, .op = &ignore_attr_op },
334 { "__stdcall__", NS_KEYWORD, .op = &ignore_attr_op },
335 { "fastcall", NS_KEYWORD, .op = &ignore_attr_op },
336 { "__fastcall__", NS_KEYWORD, .op = &ignore_attr_op },
337 { "dllimport", NS_KEYWORD, .op = &ignore_attr_op },
338 { "__dllimport__", NS_KEYWORD, .op = &ignore_attr_op },
339 { "dllexport", NS_KEYWORD, .op = &ignore_attr_op },
340 { "__dllexport__", NS_KEYWORD, .op = &ignore_attr_op },
341 { "constructor", NS_KEYWORD, .op = &ignore_attr_op },
342 { "__constructor__", NS_KEYWORD, .op = &ignore_attr_op },
343 { "destructor", NS_KEYWORD, .op = &ignore_attr_op },
344 { "__destructor__", NS_KEYWORD, .op = &ignore_attr_op },
345 };
346
347 void init_parser(int stream)
348 {
349 int i;
350 for (i = 0; i < sizeof keyword_table/sizeof keyword_table[0]; i++) {
351 struct init_keyword *ptr = keyword_table + i;
352 struct symbol *sym = create_symbol(stream, ptr->name, SYM_KEYWORD, ptr->ns);
353 sym->ident->keyword = 1;
354 sym->ctype.modifiers = ptr->modifiers;
355 sym->op = ptr->op;
356 }
357 }
358
359 // Add a symbol to the list of function-local symbols
360 static void fn_local_symbol(struct symbol *sym)
361 {
362 if (function_symbol_list)
363 add_symbol(function_symbol_list, sym);
364 }
365
366 static int SENTINEL_ATTR match_idents(struct token *token, ...)
367 {
368 va_list args;
369
370 if (token_type(token) != TOKEN_IDENT)
371 return 0;
372
373 va_start(args, token);
374 for (;;) {
375 struct ident * next = va_arg(args, struct ident *);
376 if (!next)
377 return 0;
378 if (token->ident == next)
379 return 1;
380 }
381 }
382
383
384 struct statement *alloc_statement(struct position pos, int type)
385 {
386 struct statement *stmt = __alloc_statement(0);
387 stmt->type = type;
388 stmt->pos = pos;
389 return stmt;
390 }
391
392 static struct token *struct_declaration_list(struct token *token, struct symbol_list **list);
393
394 static int apply_modifiers(struct position pos, struct ctype *ctype)
395 {
396 struct symbol *base;
397
398 while ((base = ctype->base_type)) {
399 switch (base->type) {
400 case SYM_FN:
401 case SYM_ENUM:
402 case SYM_ARRAY:
403 case SYM_BITFIELD:
404 case SYM_PTR:
405 ctype = &base->ctype;
406 continue;
407 }
408 break;
409 }
410
411 /* Turn the "virtual types" into real types with real sizes etc */
412 if (ctype->base_type == &int_type) {
413 ctype->base_type = ctype_integer(ctype->modifiers);
414 ctype->modifiers &= ~MOD_SPECIFIER;
415 } else if (ctype->base_type == &fp_type) {
416 ctype->base_type = ctype_fp(ctype->modifiers);
417 ctype->modifiers &= ~MOD_SPECIFIER;
418 }
419
420 if (ctype->modifiers & MOD_BITWISE) {
421 struct symbol *type;
422 ctype->modifiers &= ~(MOD_BITWISE | MOD_SPECIFIER);
423 if (!is_int_type(ctype->base_type)) {
424 sparse_error(pos, "invalid modifier");
425 return 1;
426 }
427 type = alloc_symbol(pos, SYM_BASETYPE);
428 *type = *ctype->base_type;
429 type->ctype.base_type = ctype->base_type;
430 type->type = SYM_RESTRICT;
431 type->ctype.modifiers &= ~MOD_SPECIFIER;
432 ctype->base_type = type;
433 create_fouled(type);
434 }
435 return 0;
436 }
437
438 static struct symbol * alloc_indirect_symbol(struct position pos, struct ctype *ctype, int type)
439 {
440 struct symbol *sym = alloc_symbol(pos, type);
441
442 sym->ctype.base_type = ctype->base_type;
443 sym->ctype.modifiers = ctype->modifiers & ~MOD_STORAGE;
444
445 ctype->base_type = sym;
446 ctype->modifiers &= MOD_STORAGE;
447 return sym;
448 }
449
450 static struct symbol *lookup_or_create_symbol(enum namespace ns, enum type type, struct token *token)
451 {
452 struct symbol *sym = lookup_symbol(token->ident, ns);
453 if (!sym) {
454 sym = alloc_symbol(token->pos, type);
455 bind_symbol(sym, token->ident, ns);
456 if (type == SYM_LABEL)
457 fn_local_symbol(sym);
458 }
459 return sym;
460 }
461
462 /*
463 * NOTE! NS_LABEL is not just a different namespace,
464 * it also ends up using function scope instead of the
465 * regular symbol scope.
466 */
467 struct symbol *label_symbol(struct token *token)
468 {
469 return lookup_or_create_symbol(NS_LABEL, SYM_LABEL, token);
470 }
471
472 static struct token *struct_union_enum_specifier(enum type type,
473 struct token *token, struct ctype *ctype,
474 struct token *(*parse)(struct token *, struct symbol *))
475 {
476 struct symbol *sym;
477 struct position *repos;
478
479 ctype->modifiers = 0;
480 token = handle_attributes(token, ctype, KW_ATTRIBUTE | KW_ASM);
481 if (token_type(token) == TOKEN_IDENT) {
482 sym = lookup_symbol(token->ident, NS_STRUCT);
483 if (!sym ||
484 (sym->scope != block_scope &&
485 (match_op(token->next,';') || match_op(token->next,'{')))) {
486 // Either a new symbol, or else an out-of-scope
487 // symbol being redefined.
488 sym = alloc_symbol(token->pos, type);
489 bind_symbol(sym, token->ident, NS_STRUCT);
490 }
491 if (sym->type != type)
492 error_die(token->pos, "invalid tag applied to %s", show_typename (sym));
493 ctype->base_type = sym;
494 repos = &token->pos;
495 token = token->next;
496 if (match_op(token, '{')) {
497 // The following test is actually wrong for empty
498 // structs, but (1) they are not C99, (2) gcc does
499 // the same thing, and (3) it's easier.
500 if (sym->symbol_list)
501 error_die(token->pos, "redefinition of %s", show_typename (sym));
502 sym->pos = *repos;
503 token = parse(token->next, sym);
504 token = expect(token, '}', "at end of struct-union-enum-specifier");
505
506 // Mark the structure as needing re-examination
507 sym->examined = 0;
508 }
509 return token;
510 }
511
512 // private struct/union/enum type
513 if (!match_op(token, '{')) {
514 sparse_error(token->pos, "expected declaration");
515 ctype->base_type = &bad_ctype;
516 return token;
517 }
518
519 sym = alloc_symbol(token->pos, type);
520 token = parse(token->next, sym);
521 ctype->base_type = sym;
522 return expect(token, '}', "at end of specifier");
523 }
524
525 static struct token *parse_struct_declaration(struct token *token, struct symbol *sym)
526 {
527 struct symbol *field, *last = NULL;
528 struct token *res;
529 res = struct_declaration_list(token, &sym->symbol_list);
530 FOR_EACH_PTR(sym->symbol_list, field) {
531 if (!field->ident) {
532 struct symbol *base = field->ctype.base_type;
533 if (base && base->type == SYM_BITFIELD)
534 continue;
535 }
536 if (last)
537 last->next_subobject = field;
538 last = field;
539 } END_FOR_EACH_PTR(field);
540 return res;
541 }
542
543 static struct token *parse_union_declaration(struct token *token, struct symbol *sym)
544 {
545 return struct_declaration_list(token, &sym->symbol_list);
546 }
547
548 static struct token *struct_specifier(struct token *token, struct ctype *ctype)
549 {
550 return struct_union_enum_specifier(SYM_STRUCT, token, ctype, parse_struct_declaration);
551 }
552
553 static struct token *union_specifier(struct token *token, struct ctype *ctype)
554 {
555 return struct_union_enum_specifier(SYM_UNION, token, ctype, parse_union_declaration);
556 }
557
558
559 typedef struct {
560 int x;
561 unsigned long long y;
562 } Num;
563
564 static void upper_boundary(Num *n, Num *v)
565 {
566 if (n->x > v->x)
567 return;
568 if (n->x < v->x) {
569 *n = *v;
570 return;
571 }
572 if (n->y < v->y)
573 n->y = v->y;
574 }
575
576 static void lower_boundary(Num *n, Num *v)
577 {
578 if (n->x < v->x)
579 return;
580 if (n->x > v->x) {
581 *n = *v;
582 return;
583 }
584 if (n->y > v->y)
585 n->y = v->y;
586 }
587
588 static int type_is_ok(struct symbol *type, Num *upper, Num *lower)
589 {
590 int shift = type->bit_size;
591 int is_unsigned = type->ctype.modifiers & MOD_UNSIGNED;
592
593 if (!is_unsigned)
594 shift--;
595 if (upper->x == 0 && upper->y >> shift)
596 return 0;
597 if (lower->x == 0 || (!is_unsigned && (~lower->y >> shift) == 0))
598 return 1;
599 return 0;
600 }
601
602 static struct symbol *bigger_enum_type(struct symbol *s1, struct symbol *s2)
603 {
604 if (s1->bit_size < s2->bit_size) {
605 s1 = s2;
606 } else if (s1->bit_size == s2->bit_size) {
607 if (s2->ctype.modifiers & MOD_UNSIGNED)
608 s1 = s2;
609 }
610 if (s1->bit_size < bits_in_int)
611 return &int_ctype;
612 return s1;
613 }
614
615 static void cast_enum_list(struct symbol_list *list, struct symbol *base_type)
616 {
617 struct symbol *sym;
618
619 FOR_EACH_PTR(list, sym) {
620 struct expression *expr = sym->initializer;
621 struct symbol *ctype;
622 if (expr->type != EXPR_VALUE)
623 continue;
624 ctype = expr->ctype;
625 if (ctype->bit_size == base_type->bit_size)
626 continue;
627 cast_value(expr, base_type, expr, ctype);
628 } END_FOR_EACH_PTR(sym);
629 }
630
631 static struct token *parse_enum_declaration(struct token *token, struct symbol *parent)
632 {
633 unsigned long long lastval = 0;
634 struct symbol *ctype = NULL, *base_type = NULL;
635 Num upper = {-1, 0}, lower = {1, 0};
636 struct symbol_list *entries = NULL;
637
638 parent->examined = 1;
639 parent->ctype.base_type = &int_ctype;
640 while (token_type(token) == TOKEN_IDENT) {
641 struct expression *expr = NULL;
642 struct token *next = token->next;
643 struct symbol *sym;
644
645 sym = alloc_symbol(token->pos, SYM_NODE);
646 bind_symbol(sym, token->ident, NS_SYMBOL);
647 sym->ctype.modifiers &= ~MOD_ADDRESSABLE;
648
649 if (match_op(next, '=')) {
650 next = constant_expression(next->next, &expr);
651 lastval = get_expression_value(expr);
652 ctype = &void_ctype;
653 if (expr && expr->ctype)
654 ctype = expr->ctype;
655 } else if (!ctype) {
656 ctype = &int_ctype;
657 } else if (is_int_type(ctype)) {
658 lastval++;
659 } else {
660 error_die(token->pos, "can't increment the last enum member");
661 }
662
663 if (!expr) {
664 expr = alloc_expression(token->pos, EXPR_VALUE);
665 expr->value = lastval;
666 expr->ctype = ctype;
667 }
668
669 sym->initializer = expr;
670 sym->ctype.base_type = parent;
671 add_ptr_list(&entries, sym);
672
673 if (base_type != &bad_ctype) {
674 if (ctype->type == SYM_NODE)
675 ctype = ctype->ctype.base_type;
676 if (ctype->type == SYM_ENUM) {
677 if (ctype == parent)
678 ctype = base_type;
679 else
680 ctype = ctype->ctype.base_type;
681 }
682 /*
683 * base_type rules:
684 * - if all enums are of the same type, then
685 * the base_type is that type (two first
686 * cases)
687 * - if enums are of different types, they
688 * all have to be integer types, and the
689 * base type is at least "int_ctype".
690 * - otherwise the base_type is "bad_ctype".
691 */
692 if (!base_type) {
693 base_type = ctype;
694 } else if (ctype == base_type) {
695 /* nothing */
696 } else if (is_int_type(base_type) && is_int_type(ctype)) {
697 base_type = bigger_enum_type(base_type, ctype);
698 } else
699 base_type = &bad_ctype;
700 parent->ctype.base_type = base_type;
701 }
702 if (is_int_type(base_type)) {
703 Num v = {.y = lastval};
704 if (ctype->ctype.modifiers & MOD_UNSIGNED)
705 v.x = 0;
706 else if ((long long)lastval >= 0)
707 v.x = 0;
708 else
709 v.x = -1;
710 upper_boundary(&upper, &v);
711 lower_boundary(&lower, &v);
712 }
713 token = next;
714 if (!match_op(token, ','))
715 break;
716 token = token->next;
717 }
718 if (!base_type) {
719 sparse_error(token->pos, "bad enum definition");
720 base_type = &bad_ctype;
721 }
722 else if (!is_int_type(base_type))
723 base_type = base_type;
724 else if (type_is_ok(base_type, &upper, &lower))
725 base_type = base_type;
726 else if (type_is_ok(&int_ctype, &upper, &lower))
727 base_type = &int_ctype;
728 else if (type_is_ok(&uint_ctype, &upper, &lower))
729 base_type = &uint_ctype;
730 else if (type_is_ok(&long_ctype, &upper, &lower))
731 base_type = &long_ctype;
732 else if (type_is_ok(&ulong_ctype, &upper, &lower))
733 base_type = &ulong_ctype;
734 else if (type_is_ok(&llong_ctype, &upper, &lower))
735 base_type = &llong_ctype;
736 else if (type_is_ok(&ullong_ctype, &upper, &lower))
737 base_type = &ullong_ctype;
738 else
739 base_type = &bad_ctype;
740 parent->ctype.base_type = base_type;
741 parent->ctype.modifiers |= (base_type->ctype.modifiers & MOD_UNSIGNED);
742 parent->examined = 0;
743
744 cast_enum_list(entries, base_type);
745 free_ptr_list(&entries);
746
747 return token;
748 }
749
750 static struct token *enum_specifier(struct token *token, struct ctype *ctype)
751 {
752 struct token *ret = struct_union_enum_specifier(SYM_ENUM, token, ctype, parse_enum_declaration);
753
754 ctype = &ctype->base_type->ctype;
755 if (!ctype->base_type)
756 ctype->base_type = &incomplete_ctype;
757
758 return ret;
759 }
760
761 static struct token *typeof_specifier(struct token *token, struct ctype *ctype)
762 {
763 struct symbol *sym;
764
765 if (!match_op(token, '(')) {
766 sparse_error(token->pos, "expected '(' after typeof");
767 return token;
768 }
769 if (lookup_type(token->next)) {
770 token = typename(token->next, &sym);
771 *ctype = sym->ctype;
772 } else {
773 struct symbol *typeof_sym = alloc_symbol(token->pos, SYM_TYPEOF);
774 token = parse_expression(token->next, &typeof_sym->initializer);
775
776 ctype->modifiers = 0;
777 ctype->base_type = typeof_sym;
778 }
779 return expect(token, ')', "after typeof");
780 }
781
782 static struct token *ignore_attribute(struct token *token, struct symbol *attr, struct ctype *ctype)
783 {
784 struct expression *expr = NULL;
785 if (match_op(token, '('))
786 token = parens_expression(token, &expr, "in attribute");
787 return token;
788 }
789
790 static struct token *attribute_packed(struct token *token, struct symbol *attr, struct ctype *ctype)
791 {
792 ctype->alignment = 1;
793 return token;
794 }
795
796 static struct token *attribute_aligned(struct token *token, struct symbol *attr, struct ctype *ctype)
797 {
798 int alignment = max_alignment;
799 struct expression *expr = NULL;
800
801 if (match_op(token, '(')) {
802 token = parens_expression(token, &expr, "in attribute");
803 if (expr)
804 alignment = get_expression_value(expr);
805 }
806 ctype->alignment = alignment;
807 return token;
808 }
809
810 static struct token *attribute_modifier(struct token *token, struct symbol *attr, struct ctype *ctype)
811 {
812 ctype->modifiers |= attr->ctype.modifiers;
813 return token;
814 }
815
816 static struct token *attribute_address_space(struct token *token, struct symbol *attr, struct ctype *ctype)
817 {
818 struct expression *expr = NULL;
819 token = expect(token, '(', "after address_space attribute");
820 token = conditional_expression(token, &expr);
821 if (expr)
822 ctype->as = get_expression_value(expr);
823 token = expect(token, ')', "after address_space attribute");
824 return token;
825 }
826
827 static struct token *attribute_mode(struct token *token, struct symbol *attr, struct ctype *ctype)
828 {
829 token = expect(token, '(', "after mode attribute");
830 if (token_type(token) == TOKEN_IDENT) {
831 struct symbol *mode = lookup_keyword(token->ident, NS_KEYWORD);
832 if (mode && mode->op->type == KW_MODE)
833 ctype->modifiers |= mode->ctype.modifiers;
834 else
835 sparse_error(token->pos, "unknown mode attribute %s\n", show_ident(token->ident));
836 token = token->next;
837 } else
838 sparse_error(token->pos, "expect attribute mode symbol\n");
839 token = expect(token, ')', "after mode attribute");
840 return token;
841 }
842
843 static struct token *attribute_context(struct token *token, struct symbol *attr, struct ctype *ctype)
844 {
845 struct context *context = alloc_context();
846 struct expression *args[3];
847 int argc = 0;
848
849 token = expect(token, '(', "after context attribute");
850 while (!match_op(token, ')')) {
851 struct expression *expr = NULL;
852 token = conditional_expression(token, &expr);
853 if (!expr)
854 break;
855 if (argc < 3)
856 args[argc++] = expr;
857 if (!match_op(token, ','))
858 break;
859 token = token->next;
860 }
861
862 switch(argc) {
863 case 0:
864 sparse_error(token->pos, "expected context input/output values");
865 break;
866 case 1:
867 context->in = get_expression_value(args[0]);
868 break;
869 case 2:
870 context->in = get_expression_value(args[0]);
871 context->out = get_expression_value(args[1]);
872 break;
873 case 3:
874 context->context = args[0];
875 context->in = get_expression_value(args[1]);
876 context->out = get_expression_value(args[2]);
877 break;
878 }
879
880 if (argc)
881 add_ptr_list(&ctype->contexts, context);
882
883 token = expect(token, ')', "after context attribute");
884 return token;
885 }
886
887 static struct token *attribute_transparent_union(struct token *token, struct symbol *attr, struct ctype *ctype)
888 {
889 if (Wtransparent_union)
890 sparse_error(token->pos, "ignoring attribute __transparent_union__");
891 return token;
892 }
893
894 static struct token *recover_unknown_attribute(struct token *token)
895 {
896 struct expression *expr = NULL;
897
898 sparse_error(token->pos, "attribute '%s': unknown attribute", show_ident(token->ident));
899 token = token->next;
900 if (match_op(token, '('))
901 token = parens_expression(token, &expr, "in attribute");
902 return token;
903 }
904
905 static struct token *attribute_specifier(struct token *token, struct ctype *ctype)
906 {
907 ctype->modifiers = 0;
908 token = expect(token, '(', "after attribute");
909 token = expect(token, '(', "after attribute");
910
911 for (;;) {
912 struct ident *attribute_name;
913 struct symbol *attr;
914
915 if (eof_token(token))
916 break;
917 if (match_op(token, ';'))
918 break;
919 if (token_type(token) != TOKEN_IDENT)
920 break;
921 attribute_name = token->ident;
922 attr = lookup_keyword(attribute_name, NS_KEYWORD);
923 if (attr && attr->op->attribute)
924 token = attr->op->attribute(token->next, attr, ctype);
925 else
926 token = recover_unknown_attribute(token);
927
928 if (!match_op(token, ','))
929 break;
930 token = token->next;
931 }
932
933 token = expect(token, ')', "after attribute");
934 token = expect(token, ')', "after attribute");
935 return token;
936 }
937
938 struct symbol * ctype_integer(unsigned long spec)
939 {
940 static struct symbol *const integer_ctypes[][3] = {
941 { &llong_ctype, &sllong_ctype, &ullong_ctype },
942 { &long_ctype, &slong_ctype, &ulong_ctype },
943 { &short_ctype, &sshort_ctype, &ushort_ctype },
944 { &char_ctype, &schar_ctype, &uchar_ctype },
945 { &int_ctype, &sint_ctype, &uint_ctype },
946 };
947 struct symbol *const (*ctype)[3];
948 int sub;
949
950 ctype = integer_ctypes;
951 if (!(spec & MOD_LONGLONG)) {
952 ctype++;
953 if (!(spec & MOD_LONG)) {
954 ctype++;
955 if (!(spec & MOD_SHORT)) {
956 ctype++;
957 if (!(spec & MOD_CHAR))
958 ctype++;
959 }
960 }
961 }
962
963 sub = ((spec & MOD_UNSIGNED)
964 ? 2
965 : ((spec & MOD_EXPLICITLY_SIGNED)
966 ? 1
967 : 0));
968
969 return ctype[0][sub];
970 }
971
972 struct symbol * ctype_fp(unsigned long spec)
973 {
974 if (spec & MOD_LONGLONG)
975 return &ldouble_ctype;
976 if (spec & MOD_LONG)
977 return &double_ctype;
978 return &float_ctype;
979 }
980
981 static void apply_ctype(struct position pos, struct ctype *thistype, struct ctype *ctype)
982 {
983 unsigned long mod = thistype->modifiers;
984
985 if (mod) {
986 unsigned long old = ctype->modifiers;
987 unsigned long extra = 0, dup, conflict;
988
989 if (mod & old & MOD_LONG) {
990 extra = MOD_LONGLONG | MOD_LONG;
991 mod &= ~MOD_LONG;
992 old &= ~MOD_LONG;
993 }
994 dup = (mod & old) | (extra & old) | (extra & mod);
995 if (dup)
996 sparse_error(pos, "Just how %sdo you want this type to be?",
997 modifier_string(dup));
998
999 conflict = !(~mod & ~old & (MOD_LONG | MOD_SHORT));
1000 if (conflict)
1001 sparse_error(pos, "You cannot have both long and short modifiers.");
1002
1003 conflict = !(~mod & ~old & (MOD_SIGNED | MOD_UNSIGNED));
1004 if (conflict)
1005 sparse_error(pos, "You cannot have both signed and unsigned modifiers.");
1006
1007 // Only one storage modifier allowed, except that "inline" doesn't count.
1008 conflict = (mod | old) & (MOD_STORAGE & ~MOD_INLINE);
1009 conflict &= (conflict - 1);
1010 if (conflict)
1011 sparse_error(pos, "multiple storage classes");
1012
1013 ctype->modifiers = old | mod | extra;
1014 }
1015
1016 /* Context */
1017 concat_ptr_list((struct ptr_list *)thistype->contexts,
1018 (struct ptr_list **)&ctype->contexts);
1019
1020 /* Alignment */
1021 if (thistype->alignment & (thistype->alignment-1)) {
1022 warning(pos, "I don't like non-power-of-2 alignments");
1023 thistype->alignment = 0;
1024 }
1025 if (thistype->alignment > ctype->alignment)
1026 ctype->alignment = thistype->alignment;
1027
1028 /* Address space */
1029 if (thistype->as)
1030 ctype->as = thistype->as;
1031 }
1032
1033 static void check_modifiers(struct position *pos, struct symbol *s, unsigned long mod)
1034 {
1035 unsigned long banned, wrong;
1036 const unsigned long BANNED_SIZE = MOD_LONG | MOD_LONGLONG | MOD_SHORT;
1037 const unsigned long BANNED_SIGN = MOD_SIGNED | MOD_UNSIGNED;
1038
1039 if (s->type == SYM_KEYWORD)
1040 banned = s->op->type == KW_SPECIFIER ? (BANNED_SIZE | BANNED_SIGN) : 0;
1041 else if (s->ctype.base_type == &fp_type)
1042 banned = BANNED_SIGN;
1043 else if (s->ctype.base_type == &int_type || !s->ctype.base_type || is_int_type (s))
1044 banned = 0;
1045 else {
1046 // label_type
1047 // void_type
1048 // bad_type
1049 // vector_type <-- whatever that is
1050 banned = BANNED_SIZE | BANNED_SIGN;
1051 }
1052
1053 wrong = mod & banned;
1054 if (wrong)
1055 sparse_error(*pos, "modifier %sis invalid in this context",
1056 modifier_string (wrong));
1057 }
1058
1059 static struct token *declaration_specifiers(struct token *next, struct ctype *ctype, int qual)
1060 {
1061 struct token *token;
1062
1063 while ( (token = next) != NULL ) {
1064 struct ctype thistype;
1065 struct ident *ident;
1066 struct symbol *s, *type;
1067 unsigned long mod;
1068
1069 next = token->next;
1070 if (token_type(token) != TOKEN_IDENT)
1071 break;
1072 ident = token->ident;
1073
1074 s = lookup_symbol(ident, NS_TYPEDEF);
1075 if (!s)
1076 break;
1077 thistype = s->ctype;
1078 mod = thistype.modifiers;
1079 if (qual) {
1080 if (s->type != SYM_KEYWORD)
1081 break;
1082 if (!(s->op->type & (KW_ATTRIBUTE | KW_QUALIFIER)))
1083 break;
1084 }
1085 if (s->type == SYM_KEYWORD && s->op->declarator) {
1086 next = s->op->declarator(next, &thistype);
1087 mod = thistype.modifiers;
1088 }
1089 type = thistype.base_type;
1090 if (type) {
1091 if (qual)
1092 break;
1093 if (ctype->base_type)
1094 break;
1095 /* User types only mix with qualifiers */
1096 if (mod & MOD_USERTYPE) {
1097 if (ctype->modifiers & MOD_SPECIFIER)
1098 break;
1099 }
1100 ctype->base_type = type;
1101 }
1102
1103 check_modifiers(&token->pos, s, ctype->modifiers);
1104 apply_ctype(token->pos, &thistype, ctype);
1105 }
1106
1107 if (!ctype->base_type) {
1108 struct symbol *base = &incomplete_ctype;
1109
1110 /*
1111 * If we have modifiers, we'll default to an integer
1112 * type, and "ctype_integer()" will turn this into
1113 * a specific one.
1114 */
1115 if (ctype->modifiers & MOD_SPECIFIER)
1116 base = &int_type;
1117 ctype->base_type = base;
1118 }
1119 return token;
1120 }
1121
1122 static struct token *abstract_array_declarator(struct token *token, struct symbol *sym)
1123 {
1124 struct expression *expr = NULL;
1125
1126 token = parse_expression(token, &expr);
1127 sym->array_size = expr;
1128 return token;
1129 }
1130
1131 static struct token *parameter_type_list(struct token *, struct symbol *, struct ident **p);
1132 static struct token *declarator(struct token *token, struct symbol *sym, struct ident **p);
1133
1134 static struct token *handle_attributes(struct token *token, struct ctype *ctype, unsigned int keywords)
1135 {
1136 struct symbol *keyword;
1137 for (;;) {
1138 struct ctype thistype = { 0, };
1139 if (token_type(token) != TOKEN_IDENT)
1140 break;
1141 keyword = lookup_keyword(token->ident, NS_KEYWORD | NS_TYPEDEF);
1142 if (!keyword || keyword->type != SYM_KEYWORD)
1143 break;
1144 if (!(keyword->op->type & keywords))
1145 break;
1146 token = keyword->op->declarator(token->next, &thistype);
1147 apply_ctype(token->pos, &thistype, ctype);
1148 }
1149 return token;
1150 }
1151
1152 static struct token *direct_declarator(struct token *token, struct symbol *decl, struct ident **p)
1153 {
1154 struct ctype *ctype = &decl->ctype;
1155
1156 if (p && token_type(token) == TOKEN_IDENT) {
1157 *p = token->ident;
1158 token = token->next;
1159 }
1160
1161 for (;;) {
1162 token = handle_attributes(token, ctype, KW_ATTRIBUTE | KW_ASM);
1163
1164 if (token_type(token) != TOKEN_SPECIAL)
1165 return token;
1166
1167 /*
1168 * This can be either a parameter list or a grouping.
1169 * For the direct (non-abstract) case, we know if must be
1170 * a parameter list if we already saw the identifier.
1171 * For the abstract case, we know if must be a parameter
1172 * list if it is empty or starts with a type.
1173 */
1174 if (token->special == '(') {
1175 struct symbol *sym;
1176 struct token *next = token->next;
1177 int fn;
1178
1179 next = handle_attributes(next, ctype, KW_ATTRIBUTE);
1180 fn = (p && *p) || match_op(next, ')') || lookup_type(next);
1181
1182 if (!fn) {
1183 struct symbol *base_type = ctype->base_type;
1184 token = declarator(next, decl, p);
1185 token = expect(token, ')', "in nested declarator");
1186 while (ctype->base_type != base_type)
1187 ctype = &ctype->base_type->ctype;
1188 p = NULL;
1189 continue;
1190 }
1191
1192 sym = alloc_indirect_symbol(token->pos, ctype, SYM_FN);
1193 token = parameter_type_list(next, sym, p);
1194 token = expect(token, ')', "in function declarator");
1195 continue;
1196 }
1197 if (token->special == '[') {
1198 struct symbol *array = alloc_indirect_symbol(token->pos, ctype, SYM_ARRAY);
1199 token = abstract_array_declarator(token->next, array);
1200 token = expect(token, ']', "in abstract_array_declarator");
1201 ctype = &array->ctype;
1202 continue;
1203 }
1204 break;
1205 }
1206 return token;
1207 }
1208
1209 static struct token *pointer(struct token *token, struct ctype *ctype)
1210 {
1211 unsigned long modifiers;
1212 struct symbol *base_type;
1213
1214 modifiers = ctype->modifiers & ~MOD_TYPEDEF;
1215 base_type = ctype->base_type;
1216 ctype->modifiers = modifiers;
1217
1218 while (match_op(token,'*')) {
1219 struct symbol *ptr = alloc_symbol(token->pos, SYM_PTR);
1220 ptr->ctype.modifiers = modifiers & ~MOD_STORAGE;
1221 ptr->ctype.as = ctype->as;
1222 concat_ptr_list((struct ptr_list *)ctype->contexts,
1223 (struct ptr_list **)&ptr->ctype.contexts);
1224 ptr->ctype.base_type = base_type;
1225
1226 base_type = ptr;
1227 ctype->modifiers = modifiers & MOD_STORAGE;
1228 ctype->base_type = base_type;
1229 ctype->as = 0;
1230 free_ptr_list(&ctype->contexts);
1231
1232 token = declaration_specifiers(token->next, ctype, 1);
1233 modifiers = ctype->modifiers;
1234 }
1235 return token;
1236 }
1237
1238 static struct token *declarator(struct token *token, struct symbol *sym, struct ident **p)
1239 {
1240 token = pointer(token, &sym->ctype);
1241 return direct_declarator(token, sym, p);
1242 }
1243
1244 static struct token *handle_bitfield(struct token *token, struct symbol *decl)
1245 {
1246 struct ctype *ctype = &decl->ctype;
1247 struct expression *expr;
1248 struct symbol *bitfield;
1249 long long width;
1250
1251 if (ctype->base_type != &int_type && !is_int_type(ctype->base_type)) {
1252 sparse_error(token->pos, "invalid bitfield specifier for type %s.",
1253 show_typename(ctype->base_type));
1254 // Parse this to recover gracefully.
1255 return conditional_expression(token->next, &expr);
1256 }
1257
1258 bitfield = alloc_indirect_symbol(token->pos, ctype, SYM_BITFIELD);
1259 token = conditional_expression(token->next, &expr);
1260 width = get_expression_value(expr);
1261 bitfield->bit_size = width;
1262
1263 if (width < 0 || width > INT_MAX) {
1264 sparse_error(token->pos, "invalid bitfield width, %lld.", width);
1265 width = -1;
1266 } else if (decl->ident && width == 0) {
1267 sparse_error(token->pos, "invalid named zero-width bitfield `%s'",
1268 show_ident(decl->ident));
1269 width = -1;
1270 } else if (decl->ident) {
1271 struct symbol *base_type = bitfield->ctype.base_type;
1272 struct symbol *bitfield_type = base_type == &int_type ? bitfield : base_type;
1273 int is_signed = !(bitfield_type->ctype.modifiers & MOD_UNSIGNED);
1274 if (Wone_bit_signed_bitfield && width == 1 && is_signed) {
1275 // Valid values are either {-1;0} or {0}, depending on integer
1276 // representation. The latter makes for very efficient code...
1277 sparse_error(token->pos, "dubious one-bit signed bitfield");
1278 }
1279 if (Wdefault_bitfield_sign &&
1280 bitfield_type->type != SYM_ENUM &&
1281 !(bitfield_type->ctype.modifiers & MOD_EXPLICITLY_SIGNED) &&
1282 is_signed) {
1283 // The sign of bitfields is unspecified by default.
1284 sparse_error(token->pos, "dubious bitfield without explicit `signed' or `unsigned'");
1285 }
1286 }
1287 bitfield->bit_size = width;
1288 return token;
1289 }
1290
1291 static struct token *declaration_list(struct token *token, struct symbol_list **list)
1292 {
1293 struct ctype ctype = {0, };
1294
1295 token = declaration_specifiers(token, &ctype, 0);
1296 for (;;) {
1297 struct ident *ident = NULL;
1298 struct symbol *decl = alloc_symbol(token->pos, SYM_NODE);
1299 decl->ctype = ctype;
1300 token = declarator(token, decl, &ident);
1301 decl->ident = ident;
1302 if (match_op(token, ':')) {
1303 token = handle_bitfield(token, decl);
1304 token = handle_attributes(token, &decl->ctype, KW_ATTRIBUTE | KW_ASM);
1305 }
1306 apply_modifiers(token->pos, &decl->ctype);
1307 add_symbol(list, decl);
1308 if (!match_op(token, ','))
1309 break;
1310 token = token->next;
1311 }
1312 return token;
1313 }
1314
1315 static struct token *struct_declaration_list(struct token *token, struct symbol_list **list)
1316 {
1317 while (!match_op(token, '}')) {
1318 if (!match_op(token, ';'))
1319 token = declaration_list(token, list);
1320 if (!match_op(token, ';')) {
1321 sparse_error(token->pos, "expected ; at end of declaration");
1322 break;
1323 }
1324 token = token->next;
1325 }
1326 return token;
1327 }
1328
1329 static struct token *parameter_declaration(struct token *token, struct symbol **tree)
1330 {
1331 struct ident *ident = NULL;
1332 struct symbol *sym;
1333 struct ctype ctype = { 0, };
1334
1335 token = declaration_specifiers(token, &ctype, 0);
1336 sym = alloc_symbol(token->pos, SYM_NODE);
1337 sym->ctype = ctype;
1338 *tree = sym;
1339 token = declarator(token, sym, &ident);
1340 sym->ident = ident;
1341 apply_modifiers(token->pos, &sym->ctype);
1342 return token;
1343 }
1344
1345 struct token *typename(struct token *token, struct symbol **p)
1346 {
1347 struct symbol *sym = alloc_symbol(token->pos, SYM_NODE);
1348 *p = sym;
1349 token = declaration_specifiers(token, &sym->ctype, 0);
1350 token = declarator(token, sym, NULL);
1351 apply_modifiers(token->pos, &sym->ctype);
1352 return token;
1353 }
1354
1355 static struct token *expression_statement(struct token *token, struct expression **tree)
1356 {
1357 token = parse_expression(token, tree);
1358 return expect(token, ';', "at end of statement");
1359 }
1360
1361 static struct token *parse_asm_operands(struct token *token, struct statement *stmt,
1362 struct expression_list **inout)
1363 {
1364 struct expression *expr;
1365
1366 /* Allow empty operands */
1367 if (match_op(token->next, ':') || match_op(token->next, ')'))
1368 return token->next;
1369 do {
1370 struct ident *ident = NULL;
1371 if (match_op(token->next, '[') &&
1372 token_type(token->next->next) == TOKEN_IDENT &&
1373 match_op(token->next->next->next, ']')) {
1374 ident = token->next->next->ident;
1375 token = token->next->next->next;
1376 }
1377 add_expression(inout, (struct expression *)ident); /* UGGLEE!!! */
1378 token = primary_expression(token->next, &expr);
1379 add_expression(inout, expr);
1380 token = parens_expression(token, &expr, "in asm parameter");
1381 add_expression(inout, expr);
1382 } while (match_op(token, ','));
1383 return token;
1384 }
1385
1386 static struct token *parse_asm_clobbers(struct token *token, struct statement *stmt,
1387 struct expression_list **clobbers)
1388 {
1389 struct expression *expr;
1390
1391 do {
1392 token = primary_expression(token->next, &expr);
1393 add_expression(clobbers, expr);
1394 } while (match_op(token, ','));
1395 return token;
1396 }
1397
1398 static struct token *parse_asm_statement(struct token *token, struct statement *stmt)
1399 {
1400 token = token->next;
1401 stmt->type = STMT_ASM;
1402 if (match_idents(token, &__volatile___ident, &__volatile_ident, &volatile_ident, NULL)) {
1403 token = token->next;
1404 }
1405 token = expect(token, '(', "after asm");
1406 token = parse_expression(token, &stmt->asm_string);
1407 if (match_op(token, ':'))
1408 token = parse_asm_operands(token, stmt, &stmt->asm_outputs);
1409 if (match_op(token, ':'))
1410 token = parse_asm_operands(token, stmt, &stmt->asm_inputs);
1411 if (match_op(token, ':'))
1412 token = parse_asm_clobbers(token, stmt, &stmt->asm_clobbers);
1413 token = expect(token, ')', "after asm");
1414 return expect(token, ';', "at end of asm-statement");
1415 }
1416
1417 static struct token *parse_asm_declarator(struct token *token, struct ctype *ctype)
1418 {
1419 struct expression *expr;
1420 token = expect(token, '(', "after asm");
1421 token = parse_expression(token->next, &expr);
1422 token = expect(token, ')', "after asm");
1423 return token;
1424 }
1425
1426 /* Make a statement out of an expression */
1427 static struct statement *make_statement(struct expression *expr)
1428 {
1429 struct statement *stmt;
1430
1431 if (!expr)
1432 return NULL;
1433 stmt = alloc_statement(expr->pos, STMT_EXPRESSION);
1434 stmt->expression = expr;
1435 return stmt;
1436 }
1437
1438 /*
1439 * All iterators have two symbols associated with them:
1440 * the "continue" and "break" symbols, which are targets
1441 * for continue and break statements respectively.
1442 *
1443 * They are in a special name-space, but they follow
1444 * all the normal visibility rules, so nested iterators
1445 * automatically work right.
1446 */
1447 static void start_iterator(struct statement *stmt)
1448 {
1449 struct symbol *cont, *brk;
1450
1451 start_symbol_scope();
1452 cont = alloc_symbol(stmt->pos, SYM_NODE);
1453 bind_symbol(cont, &continue_ident, NS_ITERATOR);
1454 brk = alloc_symbol(stmt->pos, SYM_NODE);
1455 bind_symbol(brk, &break_ident, NS_ITERATOR);
1456
1457 stmt->type = STMT_ITERATOR;
1458 stmt->iterator_break = brk;
1459 stmt->iterator_continue = cont;
1460 fn_local_symbol(brk);
1461 fn_local_symbol(cont);
1462 }
1463
1464 static void end_iterator(struct statement *stmt)
1465 {
1466 end_symbol_scope();
1467 }
1468
1469 static struct statement *start_function(struct symbol *sym)
1470 {
1471 struct symbol *ret;
1472 struct statement *stmt = alloc_statement(sym->pos, STMT_COMPOUND);
1473
1474 start_function_scope();
1475 ret = alloc_symbol(sym->pos, SYM_NODE);
1476 ret->ctype = sym->ctype.base_type->ctype;
1477 ret->ctype.modifiers &= ~(MOD_STORAGE | MOD_CONST | MOD_VOLATILE | MOD_INLINE | MOD_ADDRESSABLE | MOD_NOCAST | MOD_NODEREF | MOD_ACCESSED | MOD_TOPLEVEL);
1478 ret->ctype.modifiers |= (MOD_AUTO | MOD_REGISTER);
1479 bind_symbol(ret, &return_ident, NS_ITERATOR);
1480 stmt->ret = ret;
1481 fn_local_symbol(ret);
1482
1483 // Currently parsed symbol for __func__/__FUNCTION__/__PRETTY_FUNCTION__
1484 current_fn = sym;
1485
1486 return stmt;
1487 }
1488
1489 static void end_function(struct symbol *sym)
1490 {
1491 current_fn = NULL;
1492 end_function_scope();
1493 }
1494
1495 /*
1496 * A "switch()" statement, like an iterator, has a
1497 * the "break" symbol associated with it. It works
1498 * exactly like the iterator break - it's the target
1499 * for any break-statements in scope, and means that
1500 * "break" handling doesn't even need to know whether
1501 * it's breaking out of an iterator or a switch.
1502 *
1503 * In addition, the "case" symbol is a marker for the
1504 * case/default statements to find the switch statement
1505 * that they are associated with.
1506 */
1507 static void start_switch(struct statement *stmt)
1508 {
1509 struct symbol *brk, *switch_case;
1510
1511 start_symbol_scope();
1512 brk = alloc_symbol(stmt->pos, SYM_NODE);
1513 bind_symbol(brk, &break_ident, NS_ITERATOR);
1514
1515 switch_case = alloc_symbol(stmt->pos, SYM_NODE);
1516 bind_symbol(switch_case, &case_ident, NS_ITERATOR);
1517 switch_case->stmt = stmt;
1518
1519 stmt->type = STMT_SWITCH;
1520 stmt->switch_break = brk;
1521 stmt->switch_case = switch_case;
1522
1523 fn_local_symbol(brk);
1524 fn_local_symbol(switch_case);
1525 }
1526
1527 static void end_switch(struct statement *stmt)
1528 {
1529 if (!stmt->switch_case->symbol_list)
1530 warning(stmt->pos, "switch with no cases");
1531 end_symbol_scope();
1532 }
1533
1534 static void add_case_statement(struct statement *stmt)
1535 {
1536 struct symbol *target = lookup_symbol(&case_ident, NS_ITERATOR);
1537 struct symbol *sym;
1538
1539 if (!target) {
1540 sparse_error(stmt->pos, "not in switch scope");
1541 stmt->type = STMT_NONE;
1542 return;
1543 }
1544 sym = alloc_symbol(stmt->pos, SYM_NODE);
1545 add_symbol(&target->symbol_list, sym);
1546 sym->stmt = stmt;
1547 stmt->case_label = sym;
1548 fn_local_symbol(sym);
1549 }
1550
1551 static struct token *parse_return_statement(struct token *token, struct statement *stmt)
1552 {
1553 struct symbol *target = lookup_symbol(&return_ident, NS_ITERATOR);
1554
1555 if (!target)
1556 error_die(token->pos, "internal error: return without a function target");
1557 stmt->type = STMT_RETURN;
1558 stmt->ret_target = target;
1559 return expression_statement(token->next, &stmt->ret_value);
1560 }
1561
1562 static struct token *parse_for_statement(struct token *token, struct statement *stmt)
1563 {
1564 struct symbol_list *syms;
1565 struct expression *e1, *e2, *e3;
1566 struct statement *iterator;
1567
1568 start_iterator(stmt);
1569 token = expect(token->next, '(', "after 'for'");
1570
1571 syms = NULL;
1572 e1 = NULL;
1573 /* C99 variable declaration? */
1574 if (lookup_type(token)) {
1575 token = external_declaration(token, &syms);
1576 } else {
1577 token = parse_expression(token, &e1);
1578 token = expect(token, ';', "in 'for'");
1579 }
1580 token = parse_expression(token, &e2);
1581 token = expect(token, ';', "in 'for'");
1582 token = parse_expression(token, &e3);
1583 token = expect(token, ')', "in 'for'");
1584 token = statement(token, &iterator);
1585
1586 stmt->iterator_syms = syms;
1587 stmt->iterator_pre_statement = make_statement(e1);
1588 stmt->iterator_pre_condition = e2;
1589 stmt->iterator_post_statement = make_statement(e3);
1590 stmt->iterator_post_condition = NULL;
1591 stmt->iterator_statement = iterator;
1592 end_iterator(stmt);
1593
1594 return token;
1595 }
1596
1597 static struct token *parse_while_statement(struct token *token, struct statement *stmt)
1598 {
1599 struct expression *expr;
1600 struct statement *iterator;
1601
1602 start_iterator(stmt);
1603 token = parens_expression(token->next, &expr, "after 'while'");
1604 token = statement(token, &iterator);
1605
1606 stmt->iterator_pre_condition = expr;
1607 stmt->iterator_post_condition = NULL;
1608 stmt->iterator_statement = iterator;
1609 end_iterator(stmt);
1610
1611 return token;
1612 }
1613
1614 static struct token *parse_do_statement(struct token *token, struct statement *stmt)
1615 {
1616 struct expression *expr;
1617 struct statement *iterator;
1618
1619 start_iterator(stmt);
1620 token = statement(token->next, &iterator);
1621 if (token_type(token) == TOKEN_IDENT && token->ident == &while_ident)
1622 token = token->next;
1623 else
1624 sparse_error(token->pos, "expected 'while' after 'do'");
1625 token = parens_expression(token, &expr, "after 'do-while'");
1626
1627 stmt->iterator_post_condition = expr;
1628 stmt->iterator_statement = iterator;
1629 end_iterator(stmt);
1630
1631 if (iterator && iterator->type != STMT_COMPOUND && Wdo_while)
1632 warning(iterator->pos, "do-while statement is not a compound statement");
1633
1634 return expect(token, ';', "after statement");
1635 }
1636
1637 static struct token *parse_if_statement(struct token *token, struct statement *stmt)
1638 {
1639 stmt->type = STMT_IF;
1640 token = parens_expression(token->next, &stmt->if_conditional, "after if");
1641 token = statement(token, &stmt->if_true);
1642 if (token_type(token) != TOKEN_IDENT)
1643 return token;
1644 if (token->ident != &else_ident)
1645 return token;
1646 return statement(token->next, &stmt->if_false);
1647 }
1648
1649 static inline struct token *case_statement(struct token *token, struct statement *stmt)
1650 {
1651 stmt->type = STMT_CASE;
1652 token = expect(token, ':', "after default/case");
1653 add_case_statement(stmt);
1654 return statement(token, &stmt->case_statement);
1655 }
1656
1657 static struct token *parse_case_statement(struct token *token, struct statement *stmt)
1658 {
1659 token = parse_expression(token->next, &stmt->case_expression);
1660 if (match_op(token, SPECIAL_ELLIPSIS))
1661 token = parse_expression(token->next, &stmt->case_to);
1662 return case_statement(token, stmt);
1663 }
1664
1665 static struct token *parse_default_statement(struct token *token, struct statement *stmt)
1666 {
1667 return case_statement(token->next, stmt);
1668 }
1669
1670 static struct token *parse_loop_iterator(struct token *token, struct statement *stmt)
1671 {
1672 struct symbol *target = lookup_symbol(token->ident, NS_ITERATOR);
1673 stmt->type = STMT_GOTO;
1674 stmt->goto_label = target;
1675 if (!target)
1676 sparse_error(stmt->pos, "break/continue not in iterator scope");
1677 return expect(token->next, ';', "at end of statement");
1678 }
1679
1680 static struct token *parse_switch_statement(struct token *token, struct statement *stmt)
1681 {
1682 stmt->type = STMT_SWITCH;
1683 start_switch(stmt);
1684 token = parens_expression(token->next, &stmt->switch_expression, "after 'switch'");
1685 token = statement(token, &stmt->switch_statement);
1686 end_switch(stmt);
1687 return token;
1688 }
1689
1690 static struct token *parse_goto_statement(struct token *token, struct statement *stmt)
1691 {
1692 stmt->type = STMT_GOTO;
1693 token = token->next;
1694 if (match_op(token, '*')) {
1695 token = parse_expression(token->next, &stmt->goto_expression);
1696 add_statement(&function_computed_goto_list, stmt);
1697 } else if (token_type(token) == TOKEN_IDENT) {
1698 stmt->goto_label = label_symbol(token);
1699 token = token->next;
1700 } else {
1701 sparse_error(token->pos, "Expected identifier or goto expression");
1702 }
1703 return expect(token, ';', "at end of statement");
1704 }
1705
1706 static struct token *parse_context_statement(struct token *token, struct statement *stmt)
1707 {
1708 stmt->type = STMT_CONTEXT;
1709 token = parse_expression(token->next, &stmt->expression);
1710 if(stmt->expression->type == EXPR_PREOP
1711 && stmt->expression->op == '('
1712 && stmt->expression->unop->type == EXPR_COMMA) {
1713 struct expression *expr;
1714 expr = stmt->expression->unop;
1715 stmt->context = expr->left;
1716 stmt->expression = expr->right;
1717 }
1718 return expect(token, ';', "at end of statement");
1719 }
1720
1721 static struct token *parse_range_statement(struct token *token, struct statement *stmt)
1722 {
1723 stmt->type = STMT_RANGE;
1724 token = assignment_expression(token->next, &stmt->range_expression);
1725 token = expect(token, ',', "after range expression");
1726 token = assignment_expression(token, &stmt->range_low);
1727 token = expect(token, ',', "after low range");
1728 token = assignment_expression(token, &stmt->range_high);
1729 return expect(token, ';', "after range statement");
1730 }
1731
1732 static struct token *statement(struct token *token, struct statement **tree)
1733 {
1734 struct statement *stmt = alloc_statement(token->pos, STMT_NONE);
1735
1736 *tree = stmt;
1737 if (token_type(token) == TOKEN_IDENT) {
1738 struct symbol *s = lookup_keyword(token->ident, NS_KEYWORD);
1739 if (s && s->op->statement)
1740 return s->op->statement(token, stmt);
1741
1742 if (match_op(token->next, ':')) {
1743 stmt->type = STMT_LABEL;
1744 stmt->label_identifier = label_symbol(token);
1745 token = handle_attributes(token->next->next, &stmt->label_identifier->ctype, KW_ATTRIBUTE);
1746 return statement(token, &stmt->label_statement);
1747 }
1748 }
1749
1750 if (match_op(token, '{')) {
1751 stmt->type = STMT_COMPOUND;
1752 start_symbol_scope();
1753 token = compound_statement(token->next, stmt);
1754 end_symbol_scope();
1755
1756 return expect(token, '}', "at end of compound statement");
1757 }
1758
1759 stmt->type = STMT_EXPRESSION;
1760 return expression_statement(token, &stmt->expression);
1761 }
1762
1763 static struct token * statement_list(struct token *token, struct statement_list **list)
1764 {
1765 int seen_statement = 0;
1766 for (;;) {
1767 struct statement * stmt;
1768 if (eof_token(token))
1769 break;
1770 if (match_op(token, '}'))
1771 break;
1772 if (lookup_type(token)) {
1773 if (seen_statement) {
1774 warning(token->pos, "mixing declarations and code");
1775 seen_statement = 0;
1776 }
1777 stmt = alloc_statement(token->pos, STMT_DECLARATION);
1778 token = external_declaration(token, &stmt->declaration);
1779 } else {
1780 seen_statement = warn_on_mixed;
1781 token = statement(token, &stmt);
1782 }
1783 add_statement(list, stmt);
1784 }
1785 return token;
1786 }
1787
1788 static struct token *parameter_type_list(struct token *token, struct symbol *fn, struct ident **p)
1789 {
1790 struct symbol_list **list = &fn->arguments;
1791
1792 if (match_op(token, ')')) {
1793 // No warning for "void oink ();"
1794 // Bug or feature: warns for "void oink () __attribute__ ((noreturn));"
1795 if (p && !match_op(token->next, ';'))
1796 warning(token->pos, "non-ANSI function declaration of function '%s'", show_ident(*p));
1797 return token;
1798 }
1799
1800 for (;;) {
1801 struct symbol *sym;
1802
1803 if (match_op(token, SPECIAL_ELLIPSIS)) {
1804 if (!*list)
1805 warning(token->pos, "variadic functions must have one named argument");
1806 fn->variadic = 1;
1807 token = token->next;
1808 break;
1809 }
1810
1811 sym = alloc_symbol(token->pos, SYM_NODE);
1812 token = parameter_declaration(token, &sym);
1813 if (sym->ctype.base_type == &void_ctype) {
1814 /* Special case: (void) */
1815 if (!*list && !sym->ident)
1816 break;
1817 warning(token->pos, "void parameter");
1818 }
1819 add_symbol(list, sym);
1820 if (!match_op(token, ','))
1821 break;
1822 token = token->next;
1823
1824 }
1825 return token;
1826 }
1827
1828 struct token *compound_statement(struct token *token, struct statement *stmt)
1829 {
1830 token = statement_list(token, &stmt->stmts);
1831 return token;
1832 }
1833
1834 static struct expression *identifier_expression(struct token *token)
1835 {
1836 struct expression *expr = alloc_expression(token->pos, EXPR_IDENTIFIER);
1837 expr->expr_ident = token->ident;
1838 return expr;
1839 }
1840
1841 static struct expression *index_expression(struct expression *from, struct expression *to)
1842 {
1843 int idx_from, idx_to;
1844 struct expression *expr = alloc_expression(from->pos, EXPR_INDEX);
1845
1846 idx_from = get_expression_value(from);
1847 idx_to = idx_from;
1848 if (to) {
1849 idx_to = get_expression_value(to);
1850 if (idx_to < idx_from || idx_from < 0)
1851 warning(from->pos, "nonsense array initializer index range");
1852 }
1853 expr->idx_from = idx_from;
1854 expr->idx_to = idx_to;
1855 return expr;
1856 }
1857
1858 static struct token *single_initializer(struct expression **ep, struct token *token)
1859 {
1860 int expect_equal = 0;
1861 struct token *next = token->next;
1862 struct expression **tail = ep;
1863 int nested;
1864
1865 *ep = NULL;
1866
1867 if ((token_type(token) == TOKEN_IDENT) && match_op(next, ':')) {
1868 struct expression *expr = identifier_expression(token);
1869 if (Wold_initializer)
1870 warning(token->pos, "obsolete struct initializer, use C99 syntax");
1871 token = initializer(&expr->ident_expression, next->next);
1872 if (expr->ident_expression)
1873 *ep = expr;
1874 return token;
1875 }
1876
1877 for (tail = ep, nested = 0; ; nested++, next = token->next) {
1878 if (match_op(token, '.') && (token_type(next) == TOKEN_IDENT)) {
1879 struct expression *expr = identifier_expression(next);
1880 *tail = expr;
1881 tail = &expr->ident_expression;
1882 expect_equal = 1;
1883 token = next->next;
1884 } else if (match_op(token, '[')) {
1885 struct expression *from = NULL, *to = NULL, *expr;
1886 token = constant_expression(token->next, &from);
1887 if (!from) {
1888 sparse_error(token->pos, "Expected constant expression");
1889 break;
1890 }
1891 if (match_op(token, SPECIAL_ELLIPSIS))
1892 token = constant_expression(token->next, &to);
1893 expr = index_expression(from, to);
1894 *tail = expr;
1895 tail = &expr->idx_expression;
1896 token = expect(token, ']', "at end of initializer index");
1897 if (nested)
1898 expect_equal = 1;
1899 } else {
1900 break;
1901 }
1902 }
1903 if (nested && !expect_equal) {
1904 if (!match_op(token, '='))
1905 warning(token->pos, "obsolete array initializer, use C99 syntax");
1906 else
1907 expect_equal = 1;
1908 }
1909 if (expect_equal)
1910 token = expect(token, '=', "at end of initializer index");
1911
1912 token = initializer(tail, token);
1913 if (!*tail)
1914 *ep = NULL;
1915 return token;
1916 }
1917
1918 static struct token *initializer_list(struct expression_list **list, struct token *token)
1919 {
1920 struct expression *expr;
1921
1922 for (;;) {
1923 token = single_initializer(&expr, token);
1924 if (!expr)
1925 break;
1926 add_expression(list, expr);
1927 if (!match_op(token, ','))
1928 break;
1929 token = token->next;
1930 }
1931 return token;
1932 }
1933
1934 struct token *initializer(struct expression **tree, struct token *token)
1935 {
1936 if (match_op(token, '{')) {
1937 struct expression *expr = alloc_expression(token->pos, EXPR_INITIALIZER);
1938 *tree = expr;
1939 token = initializer_list(&expr->expr_list, token->next);
1940 return expect(token, '}', "at end of initializer");
1941 }
1942 return assignment_expression(token, tree);
1943 }
1944
1945 static void declare_argument(struct symbol *sym, struct symbol *fn)
1946 {
1947 if (!sym->ident) {
1948 sparse_error(sym->pos, "no identifier for function argument");
1949 return;
1950 }
1951 bind_symbol(sym, sym->ident, NS_SYMBOL);
1952 }
1953
1954 static struct token *parse_function_body(struct token *token, struct symbol *decl,
1955 struct symbol_list **list)
1956 {
1957 struct symbol_list **old_symbol_list;
1958 struct symbol *base_type = decl->ctype.base_type;
1959 struct statement *stmt, **p;
1960 struct symbol *arg;
1961
1962 old_symbol_list = function_symbol_list;
1963 if (decl->ctype.modifiers & MOD_INLINE) {
1964 function_symbol_list = &decl->inline_symbol_list;
1965 p = &base_type->inline_stmt;
1966 } else {
1967 function_symbol_list = &decl->symbol_list;
1968 p = &base_type->stmt;
1969 }
1970 function_computed_target_list = NULL;
1971 function_computed_goto_list = NULL;
1972
1973 if (decl->ctype.modifiers & MOD_EXTERN) {
1974 if (!(decl->ctype.modifiers & MOD_INLINE))
1975 warning(decl->pos, "function '%s' with external linkage has definition", show_ident(decl->ident));
1976 }
1977 if (!(decl->ctype.modifiers & MOD_STATIC))
1978 decl->ctype.modifiers |= MOD_EXTERN;
1979
1980 stmt = start_function(decl);
1981
1982 *p = stmt;
1983 FOR_EACH_PTR (base_type->arguments, arg) {
1984 declare_argument(arg, base_type);
1985 } END_FOR_EACH_PTR(arg);
1986
1987 token = compound_statement(token->next, stmt);
1988
1989 end_function(decl);
1990 if (!(decl->ctype.modifiers & MOD_INLINE))
1991 add_symbol(list, decl);
1992 check_declaration(decl);
1993 function_symbol_list = old_symbol_list;
1994 if (function_computed_goto_list) {
1995 if (!function_computed_target_list)
1996 warning(decl->pos, "function '%s' has computed goto but no targets?", show_ident(decl->ident));
1997 else {
1998 FOR_EACH_PTR(function_computed_goto_list, stmt) {
1999 stmt->target_list = function_computed_target_list;
2000 } END_FOR_EACH_PTR(stmt);
2001 }
2002 }
2003 return expect(token, '}', "at end of function");
2004 }
2005
2006 static void promote_k_r_types(struct symbol *arg)
2007 {
2008 struct symbol *base = arg->ctype.base_type;
2009 if (base && base->ctype.base_type == &int_type && (base->ctype.modifiers & (MOD_CHAR | MOD_SHORT))) {
2010 arg->ctype.base_type = &int_ctype;
2011 }
2012 }
2013
2014 static void apply_k_r_types(struct symbol_list *argtypes, struct symbol *fn)
2015 {
2016 struct symbol_list *real_args = fn->ctype.base_type->arguments;
2017 struct symbol *arg;
2018
2019 FOR_EACH_PTR(real_args, arg) {
2020 struct symbol *type;
2021
2022 /* This is quadratic in the number of arguments. We _really_ don't care */
2023 FOR_EACH_PTR(argtypes, type) {
2024 if (type->ident == arg->ident)
2025 goto match;
2026 } END_FOR_EACH_PTR(type);
2027 sparse_error(arg->pos, "missing type declaration for parameter '%s'", show_ident(arg->ident));
2028 continue;
2029 match:
2030 type->used = 1;
2031 /* "char" and "short" promote to "int" */
2032 promote_k_r_types(type);
2033
2034 arg->ctype = type->ctype;
2035 } END_FOR_EACH_PTR(arg);
2036
2037 FOR_EACH_PTR(argtypes, arg) {
2038 if (!arg->used)
2039 warning(arg->pos, "nonsensical parameter declaration '%s'", show_ident(arg->ident));
2040 } END_FOR_EACH_PTR(arg);
2041
2042 }
2043
2044 static struct token *parse_k_r_arguments(struct token *token, struct symbol *decl,
2045 struct symbol_list **list)
2046 {
2047 struct symbol_list *args = NULL;
2048
2049 warning(token->pos, "non-ANSI definition of function '%s'", show_ident(decl->ident));
2050 do {
2051 token = declaration_list(token, &args);
2052 if (!match_op(token, ';')) {
2053 sparse_error(token->pos, "expected ';' at end of parameter declaration");
2054 break;
2055 }
2056 token = token->next;
2057 } while (lookup_type(token));
2058
2059 apply_k_r_types(args, decl);
2060
2061 if (!match_op(token, '{')) {
2062 sparse_error(token->pos, "expected function body");
2063 return token;
2064 }
2065 return parse_function_body(token, decl, list);
2066 }
2067
2068 static struct token *toplevel_asm_declaration(struct token *token, struct symbol_list **list)
2069 {
2070 struct symbol *anon = alloc_symbol(token->pos, SYM_NODE);
2071 struct symbol *fn = alloc_symbol(token->pos, SYM_FN);
2072 struct statement *stmt;
2073
2074 anon->ctype.base_type = fn;
2075 stmt = alloc_statement(token->pos, STMT_NONE);
2076 fn->stmt = stmt;
2077
2078 token = parse_asm_statement(token, stmt);
2079
2080 add_symbol(list, anon);
2081 return token;
2082 }
2083
2084 struct token *external_declaration(struct token *token, struct symbol_list **list)
2085 {
2086 struct ident *ident = NULL;
2087 struct symbol *decl;
2088 struct ctype ctype = { 0, };
2089 struct symbol *base_type;
2090 int is_typedef;
2091
2092 /* Top-level inline asm? */
2093 if (token_type(token) == TOKEN_IDENT) {
2094 struct symbol *s = lookup_keyword(token->ident, NS_KEYWORD);
2095 if (s && s->op->toplevel)
2096 return s->op->toplevel(token, list);
2097 }
2098
2099 /* Parse declaration-specifiers, if any */
2100 token = declaration_specifiers(token, &ctype, 0);
2101 decl = alloc_symbol(token->pos, SYM_NODE);
2102 decl->ctype = ctype;
2103 token = declarator(token, decl, &ident);
2104 apply_modifiers(token->pos, &decl->ctype);
2105
2106 /* Just a type declaration? */
2107 if (!ident)
2108 return expect(token, ';', "end of type declaration");
2109
2110 /* type define declaration? */
2111 is_typedef = (ctype.modifiers & MOD_TYPEDEF) != 0;
2112
2113 /* Typedefs don't have meaningful storage */
2114 if (is_typedef) {
2115 ctype.modifiers &= ~MOD_STORAGE;
2116 decl->ctype.modifiers &= ~MOD_STORAGE;
2117 decl->ctype.modifiers |= MOD_USERTYPE;
2118 }
2119
2120 bind_symbol(decl, ident, is_typedef ? NS_TYPEDEF: NS_SYMBOL);
2121
2122 base_type = decl->ctype.base_type;
2123
2124 if (is_typedef) {
2125 if (base_type && !base_type->ident)
2126 base_type->ident = ident;
2127 } else if (base_type && base_type->type == SYM_FN) {
2128 /* K&R argument declaration? */
2129 if (lookup_type(token))
2130 return parse_k_r_arguments(token, decl, list);
2131 if (match_op(token, '{'))
2132 return parse_function_body(token, decl, list);
2133
2134 if (!(decl->ctype.modifiers & MOD_STATIC))
2135 decl->ctype.modifiers |= MOD_EXTERN;
2136 } else if (base_type == &void_ctype && !(decl->ctype.modifiers & MOD_EXTERN)) {
2137 sparse_error(token->pos, "void declaration");
2138 }
2139
2140 for (;;) {
2141 if (!is_typedef && match_op(token, '=')) {
2142 if (decl->ctype.modifiers & MOD_EXTERN) {
2143 warning(decl->pos, "symbol with external linkage has initializer");
2144 decl->ctype.modifiers &= ~MOD_EXTERN;
2145 }
2146 token = initializer(&decl->initializer, token->next);
2147 }
2148 if (!is_typedef) {
2149 if (!(decl->ctype.modifiers & (MOD_EXTERN | MOD_INLINE))) {
2150 add_symbol(list, decl);
2151 fn_local_symbol(decl);
2152 }
2153 }
2154 check_declaration(decl);
2155
2156 if (!match_op(token, ','))
2157 break;
2158
2159 token = token->next;
2160 ident = NULL;
2161 decl = alloc_symbol(token->pos, SYM_NODE);
2162 decl->ctype = ctype;
2163 token = declaration_specifiers(token, &decl->ctype, 1);
2164 token = declarator(token, decl, &ident);
2165 apply_modifiers(token->pos, &decl->ctype);
2166 if (!ident) {
2167 sparse_error(token->pos, "expected identifier name in type definition");
2168 return token;
2169 }
2170
2171 bind_symbol(decl, ident, is_typedef ? NS_TYPEDEF: NS_SYMBOL);
2172
2173 /* Function declarations are automatically extern unless specifically static */
2174 base_type = decl->ctype.base_type;
2175 if (!is_typedef && base_type && base_type->type == SYM_FN) {
2176 if (!(decl->ctype.modifiers & MOD_STATIC))
2177 decl->ctype.modifiers |= MOD_EXTERN;
2178 }
2179 }
2180 return expect(token, ';', "at end of declaration");
2181 }
Static analysis for C