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fun with declarations and definitions
[smatch.git] / parse.c
blob50c8817c7e22e6fe18455e02b15a85cf378cb7c6
1 /*
2 * Stupid C parser, version 1e-6.
3 *
4 * Let's see how hard this is to do.
5 *
6 * Copyright (C) 2003 Transmeta Corp.
7 * 2003-2004 Linus Torvalds
8 * Copyright (C) 2004 Christopher Li
9 *
10 * Licensed under the Open Software License version 1.1
11 */
12
13 #include <stdarg.h>
14 #include <stdlib.h>
15 #include <stdio.h>
16 #include <string.h>
17 #include <ctype.h>
18 #include <unistd.h>
19 #include <fcntl.h>
20 #include <limits.h>
21
22 #include "lib.h"
23 #include "allocate.h"
24 #include "token.h"
25 #include "parse.h"
26 #include "symbol.h"
27 #include "scope.h"
28 #include "expression.h"
29 #include "target.h"
30
31 static struct symbol_list **function_symbol_list;
32 struct symbol_list *function_computed_target_list;
33 struct statement_list *function_computed_goto_list;
34
35 static struct token *statement(struct token *token, struct statement **tree);
36 static struct token *handle_attributes(struct token *token, struct ctype *ctype, unsigned int keywords);
37
38 static struct token *struct_specifier(struct token *token, struct ctype *ctype);
39 static struct token *union_specifier(struct token *token, struct ctype *ctype);
40 static struct token *enum_specifier(struct token *token, struct ctype *ctype);
41 static struct token *attribute_specifier(struct token *token, struct ctype *ctype);
42 static struct token *typeof_specifier(struct token *token, struct ctype *ctype);
43
44 static struct token *parse_if_statement(struct token *token, struct statement *stmt);
45 static struct token *parse_return_statement(struct token *token, struct statement *stmt);
46 static struct token *parse_loop_iterator(struct token *token, struct statement *stmt);
47 static struct token *parse_default_statement(struct token *token, struct statement *stmt);
48 static struct token *parse_case_statement(struct token *token, struct statement *stmt);
49 static struct token *parse_switch_statement(struct token *token, struct statement *stmt);
50 static struct token *parse_for_statement(struct token *token, struct statement *stmt);
51 static struct token *parse_while_statement(struct token *token, struct statement *stmt);
52 static struct token *parse_do_statement(struct token *token, struct statement *stmt);
53 static struct token *parse_goto_statement(struct token *token, struct statement *stmt);
54 static struct token *parse_context_statement(struct token *token, struct statement *stmt);
55 static struct token *parse_range_statement(struct token *token, struct statement *stmt);
56 static struct token *parse_asm_statement(struct token *token, struct statement *stmt);
57 static struct token *toplevel_asm_declaration(struct token *token, struct symbol_list **list);
58 static struct token *parse_asm_declarator(struct token *token, struct ctype *ctype);
59
60
61 static struct token *attribute_packed(struct token *token, struct symbol *attr, struct ctype *ctype);
62 static struct token *attribute_modifier(struct token *token, struct symbol *attr, struct ctype *ctype);
63 static struct token *attribute_address_space(struct token *token, struct symbol *attr, struct ctype *ctype);
64 static struct token *attribute_aligned(struct token *token, struct symbol *attr, struct ctype *ctype);
65 static struct token *attribute_mode(struct token *token, struct symbol *attr, struct ctype *ctype);
66 static struct token *attribute_context(struct token *token, struct symbol *attr, struct ctype *ctype);
67 static struct token *attribute_transparent_union(struct token *token, struct symbol *attr, struct ctype *ctype);
68 static struct token *ignore_attribute(struct token *token, struct symbol *attr, struct ctype *ctype);
69
70
71 static struct symbol_op modifier_op = {
72 .type = KW_MODIFIER,
73 };
74
75 static struct symbol_op qualifier_op = {
76 .type = KW_QUALIFIER,
77 };
78
79 static struct symbol_op typeof_op = {
80 .type = KW_TYPEOF,
81 .declarator = typeof_specifier,
82 };
83
84 static struct symbol_op attribute_op = {
85 .type = KW_ATTRIBUTE,
86 .declarator = attribute_specifier,
87 };
88
89 static struct symbol_op struct_op = {
90 .type = KW_SPECIFIER,
91 .declarator = struct_specifier,
92 };
93
94 static struct symbol_op union_op = {
95 .type = KW_SPECIFIER,
96 .declarator = union_specifier,
97 };
98
99 static struct symbol_op enum_op = {
100 .type = KW_SPECIFIER,
101 .declarator = enum_specifier,
102 };
103
104
105
106 static struct symbol_op if_op = {
107 .statement = parse_if_statement,
108 };
109
110 static struct symbol_op return_op = {
111 .statement = parse_return_statement,
112 };
113
114 static struct symbol_op loop_iter_op = {
115 .statement = parse_loop_iterator,
116 };
117
118 static struct symbol_op default_op = {
119 .statement = parse_default_statement,
120 };
121
122 static struct symbol_op case_op = {
123 .statement = parse_case_statement,
124 };
125
126 static struct symbol_op switch_op = {
127 .statement = parse_switch_statement,
128 };
129
130 static struct symbol_op for_op = {
131 .statement = parse_for_statement,
132 };
133
134 static struct symbol_op while_op = {
135 .statement = parse_while_statement,
136 };
137
138 static struct symbol_op do_op = {
139 .statement = parse_do_statement,
140 };
141
142 static struct symbol_op goto_op = {
143 .statement = parse_goto_statement,
144 };
145
146 static struct symbol_op __context___op = {
147 .statement = parse_context_statement,
148 };
149
150 static struct symbol_op range_op = {
151 .statement = parse_range_statement,
152 };
153
154 static struct symbol_op asm_op = {
155 .type = KW_ASM,
156 .declarator = parse_asm_declarator,
157 .statement = parse_asm_statement,
158 .toplevel = toplevel_asm_declaration,
159 };
160
161 static struct symbol_op packed_op = {
162 .attribute = attribute_packed,
163 };
164
165 static struct symbol_op aligned_op = {
166 .attribute = attribute_aligned,
167 };
168
169 static struct symbol_op attr_mod_op = {
170 .attribute = attribute_modifier,
171 };
172
173 static struct symbol_op address_space_op = {
174 .attribute = attribute_address_space,
175 };
176
177 static struct symbol_op mode_op = {
178 .attribute = attribute_mode,
179 };
180
181 static struct symbol_op context_op = {
182 .attribute = attribute_context,
183 };
184
185 static struct symbol_op transparent_union_op = {
186 .attribute = attribute_transparent_union,
187 };
188
189 static struct symbol_op ignore_attr_op = {
190 .attribute = ignore_attribute,
191 };
192
193 static struct symbol_op mode_spec_op = {
194 .type = KW_MODE,
195 };
196
197 static struct init_keyword {
198 const char *name;
199 enum namespace ns;
200 unsigned long modifiers;
201 struct symbol_op *op;
202 } keyword_table[] = {
203 /* Type qualifiers */
204 { "const", NS_TYPEDEF, MOD_CONST, .op = &qualifier_op },
205 { "__const", NS_TYPEDEF, MOD_CONST, .op = &qualifier_op },
206 { "__const__", NS_TYPEDEF, MOD_CONST, .op = &qualifier_op },
207 { "volatile", NS_TYPEDEF, MOD_VOLATILE, .op = &qualifier_op },
208 { "__volatile", NS_TYPEDEF, MOD_VOLATILE, .op = &qualifier_op },
209 { "__volatile__", NS_TYPEDEF, MOD_VOLATILE, .op = &qualifier_op },
210
211 /* Typedef.. */
212 { "typedef", NS_TYPEDEF, MOD_TYPEDEF, .op = &modifier_op },
213
214 /* Extended types */
215 { "typeof", NS_TYPEDEF, .op = &typeof_op },
216 { "__typeof", NS_TYPEDEF, .op = &typeof_op },
217 { "__typeof__", NS_TYPEDEF, .op = &typeof_op },
218
219 { "__attribute", NS_TYPEDEF, .op = &attribute_op },
220 { "__attribute__", NS_TYPEDEF, .op = &attribute_op },
221
222 { "struct", NS_TYPEDEF, .op = &struct_op },
223 { "union", NS_TYPEDEF, .op = &union_op },
224 { "enum", NS_TYPEDEF, .op = &enum_op },
225
226 { "inline", NS_TYPEDEF, MOD_INLINE, .op = &modifier_op },
227 { "__inline", NS_TYPEDEF, MOD_INLINE, .op = &modifier_op },
228 { "__inline__", NS_TYPEDEF, MOD_INLINE, .op = &modifier_op },
229
230 /* Ignored for now.. */
231 { "restrict", NS_TYPEDEF, .op = &qualifier_op},
232 { "__restrict", NS_TYPEDEF, .op = &qualifier_op},
233
234 /* Statement */
235 { "if", NS_KEYWORD, .op = &if_op },
236 { "return", NS_KEYWORD, .op = &return_op },
237 { "break", NS_KEYWORD, .op = &loop_iter_op },
238 { "continue", NS_KEYWORD, .op = &loop_iter_op },
239 { "default", NS_KEYWORD, .op = &default_op },
240 { "case", NS_KEYWORD, .op = &case_op },
241 { "switch", NS_KEYWORD, .op = &switch_op },
242 { "for", NS_KEYWORD, .op = &for_op },
243 { "while", NS_KEYWORD, .op = &while_op },
244 { "do", NS_KEYWORD, .op = &do_op },
245 { "goto", NS_KEYWORD, .op = &goto_op },
246 { "__context__",NS_KEYWORD, .op = &__context___op },
247 { "__range__", NS_KEYWORD, .op = &range_op },
248 { "asm", NS_KEYWORD, .op = &asm_op },
249 { "__asm", NS_KEYWORD, .op = &asm_op },
250 { "__asm__", NS_KEYWORD, .op = &asm_op },
251
252 /* Attribute */
253 { "packed", NS_KEYWORD, .op = &packed_op },
254 { "__packed__", NS_KEYWORD, .op = &packed_op },
255 { "aligned", NS_KEYWORD, .op = &aligned_op },
256 { "__aligned__",NS_KEYWORD, .op = &aligned_op },
257 { "nocast", NS_KEYWORD, MOD_NOCAST, .op = &attr_mod_op },
258 { "noderef", NS_KEYWORD, MOD_NODEREF, .op = &attr_mod_op },
259 { "safe", NS_KEYWORD, MOD_SAFE, .op = &attr_mod_op },
260 { "force", NS_KEYWORD, MOD_FORCE, .op = &attr_mod_op },
261 { "bitwise", NS_KEYWORD, MOD_BITWISE, .op = &attr_mod_op },
262 { "__bitwise__",NS_KEYWORD, MOD_BITWISE, .op = &attr_mod_op },
263 { "address_space",NS_KEYWORD, .op = &address_space_op },
264 { "mode", NS_KEYWORD, .op = &mode_op },
265 { "context", NS_KEYWORD, .op = &context_op },
266 { "__transparent_union__", NS_KEYWORD, .op = &transparent_union_op },
267
268 { "__mode__", NS_KEYWORD, .op = &mode_op },
269 { "QI", NS_KEYWORD, MOD_CHAR, .op = &mode_spec_op },
270 { "__QI__", NS_KEYWORD, MOD_CHAR, .op = &mode_spec_op },
271 { "HI", NS_KEYWORD, MOD_SHORT, .op = &mode_spec_op },
272 { "__HI__", NS_KEYWORD, MOD_SHORT, .op = &mode_spec_op },
273 { "SI", NS_KEYWORD, .op = &mode_spec_op },
274 { "__SI__", NS_KEYWORD, .op = &mode_spec_op },
275 { "DI", NS_KEYWORD, MOD_LONGLONG, .op = &mode_spec_op },
276 { "__DI__", NS_KEYWORD, MOD_LONGLONG, .op = &mode_spec_op },
277 { "word", NS_KEYWORD, MOD_LONG, .op = &mode_spec_op },
278 { "__word__", NS_KEYWORD, MOD_LONG, .op = &mode_spec_op },
279
280 /* Ignored attributes */
281 { "nothrow", NS_KEYWORD, .op = &ignore_attr_op },
282 { "__nothrow", NS_KEYWORD, .op = &ignore_attr_op },
283 { "__nothrow__", NS_KEYWORD, .op = &ignore_attr_op },
284 { "malloc", NS_KEYWORD, .op = &ignore_attr_op },
285 { "__malloc__", NS_KEYWORD, .op = &ignore_attr_op },
286 { "nonnull", NS_KEYWORD, .op = &ignore_attr_op },
287 { "__nonnull", NS_KEYWORD, .op = &ignore_attr_op },
288 { "__nonnull__", NS_KEYWORD, .op = &ignore_attr_op },
289 { "format", NS_KEYWORD, .op = &ignore_attr_op },
290 { "__format__", NS_KEYWORD, .op = &ignore_attr_op },
291 { "format_arg", NS_KEYWORD, .op = &ignore_attr_op },
292 { "__format_arg__", NS_KEYWORD, .op = &ignore_attr_op },
293 { "section", NS_KEYWORD, .op = &ignore_attr_op },
294 { "__section__",NS_KEYWORD, .op = &ignore_attr_op },
295 { "unused", NS_KEYWORD, .op = &ignore_attr_op },
296 { "__unused__", NS_KEYWORD, .op = &ignore_attr_op },
297 { "const", NS_KEYWORD, .op = &ignore_attr_op },
298 { "__const", NS_KEYWORD, .op = &ignore_attr_op },
299 { "__const__", NS_KEYWORD, .op = &ignore_attr_op },
300 { "noreturn", NS_KEYWORD, .op = &ignore_attr_op },
301 { "__noreturn__", NS_KEYWORD, .op = &ignore_attr_op },
302 { "no_instrument_function", NS_KEYWORD, .op = &ignore_attr_op },
303 { "__no_instrument_function__", NS_KEYWORD, .op = &ignore_attr_op },
304 { "sentinel", NS_KEYWORD, .op = &ignore_attr_op },
305 { "__sentinel__", NS_KEYWORD, .op = &ignore_attr_op },
306 { "regparm", NS_KEYWORD, .op = &ignore_attr_op },
307 { "__regparm__", NS_KEYWORD, .op = &ignore_attr_op },
308 { "weak", NS_KEYWORD, .op = &ignore_attr_op },
309 { "__weak__", NS_KEYWORD, .op = &ignore_attr_op },
310 { "alias", NS_KEYWORD, .op = &ignore_attr_op },
311 { "__alias__", NS_KEYWORD, .op = &ignore_attr_op },
312 { "pure", NS_KEYWORD, .op = &ignore_attr_op },
313 { "__pure__", NS_KEYWORD, .op = &ignore_attr_op },
314 { "always_inline", NS_KEYWORD, .op = &ignore_attr_op },
315 { "__always_inline__", NS_KEYWORD, .op = &ignore_attr_op },
316 { "syscall_linkage", NS_KEYWORD, .op = &ignore_attr_op },
317 { "__syscall_linkage__", NS_KEYWORD, .op = &ignore_attr_op },
318 { "visibility", NS_KEYWORD, .op = &ignore_attr_op },
319 { "__visibility__", NS_KEYWORD, .op = &ignore_attr_op },
320 { "deprecated", NS_KEYWORD, .op = &ignore_attr_op },
321 { "__deprecated__", NS_KEYWORD, .op = &ignore_attr_op },
322 { "noinline", NS_KEYWORD, .op = &ignore_attr_op },
323 { "__noinline__", NS_KEYWORD, .op = &ignore_attr_op },
324 { "used", NS_KEYWORD, .op = &ignore_attr_op },
325 { "__used__", NS_KEYWORD, .op = &ignore_attr_op },
326 { "warn_unused_result", NS_KEYWORD, .op = &ignore_attr_op },
327 { "__warn_unused_result__", NS_KEYWORD, .op = &ignore_attr_op },
328 { "model", NS_KEYWORD, .op = &ignore_attr_op },
329 { "__model__", NS_KEYWORD, .op = &ignore_attr_op },
330 { "cdecl", NS_KEYWORD, .op = &ignore_attr_op },
331 { "__cdecl__", NS_KEYWORD, .op = &ignore_attr_op },
332 { "stdcall", NS_KEYWORD, .op = &ignore_attr_op },
333 { "__stdcall__", NS_KEYWORD, .op = &ignore_attr_op },
334 { "fastcall", NS_KEYWORD, .op = &ignore_attr_op },
335 { "__fastcall__", NS_KEYWORD, .op = &ignore_attr_op },
336 { "dllimport", NS_KEYWORD, .op = &ignore_attr_op },
337 { "__dllimport__", NS_KEYWORD, .op = &ignore_attr_op },
338 { "dllexport", NS_KEYWORD, .op = &ignore_attr_op },
339 { "__dllexport__", NS_KEYWORD, .op = &ignore_attr_op },
340 { "constructor", NS_KEYWORD, .op = &ignore_attr_op },
341 { "__constructor__", NS_KEYWORD, .op = &ignore_attr_op },
342 { "destructor", NS_KEYWORD, .op = &ignore_attr_op },
343 { "__destructor__", NS_KEYWORD, .op = &ignore_attr_op },
344 { "cold", NS_KEYWORD, .op = &ignore_attr_op },
345 { "__cold__", NS_KEYWORD, .op = &ignore_attr_op },
346 { "hot", NS_KEYWORD, .op = &ignore_attr_op },
347 { "__hot__", NS_KEYWORD, .op = &ignore_attr_op },
348 };
349
350 void init_parser(int stream)
351 {
352 int i;
353 for (i = 0; i < sizeof keyword_table/sizeof keyword_table[0]; i++) {
354 struct init_keyword *ptr = keyword_table + i;
355 struct symbol *sym = create_symbol(stream, ptr->name, SYM_KEYWORD, ptr->ns);
356 sym->ident->keyword = 1;
357 sym->ctype.modifiers = ptr->modifiers;
358 sym->op = ptr->op;
359 }
360 }
361
362 // Add a symbol to the list of function-local symbols
363 static void fn_local_symbol(struct symbol *sym)
364 {
365 if (function_symbol_list)
366 add_symbol(function_symbol_list, sym);
367 }
368
369 static int SENTINEL_ATTR match_idents(struct token *token, ...)
370 {
371 va_list args;
372 struct ident * next;
373
374 if (token_type(token) != TOKEN_IDENT)
375 return 0;
376
377 va_start(args, token);
378 do {
379 next = va_arg(args, struct ident *);
380 } while (next && token->ident != next);
381 va_end(args);
382
383 return next && token->ident == next;
384 }
385
386
387 struct statement *alloc_statement(struct position pos, int type)
388 {
389 struct statement *stmt = __alloc_statement(0);
390 stmt->type = type;
391 stmt->pos = pos;
392 return stmt;
393 }
394
395 static struct token *struct_declaration_list(struct token *token, struct symbol_list **list);
396
397 static int apply_modifiers(struct position pos, struct ctype *ctype)
398 {
399 struct symbol *base;
400
401 while ((base = ctype->base_type)) {
402 switch (base->type) {
403 case SYM_FN:
404 case SYM_ENUM:
405 case SYM_ARRAY:
406 case SYM_BITFIELD:
407 case SYM_PTR:
408 ctype = &base->ctype;
409 continue;
410 }
411 break;
412 }
413
414 /* Turn the "virtual types" into real types with real sizes etc */
415 if (ctype->base_type == &int_type) {
416 ctype->base_type = ctype_integer(ctype->modifiers);
417 ctype->modifiers &= ~MOD_SPECIFIER;
418 } else if (ctype->base_type == &fp_type) {
419 ctype->base_type = ctype_fp(ctype->modifiers);
420 ctype->modifiers &= ~MOD_SPECIFIER;
421 }
422
423 if (ctype->modifiers & MOD_BITWISE) {
424 struct symbol *type;
425 ctype->modifiers &= ~(MOD_BITWISE | MOD_SPECIFIER);
426 if (!is_int_type(ctype->base_type)) {
427 sparse_error(pos, "invalid modifier");
428 return 1;
429 }
430 type = alloc_symbol(pos, SYM_BASETYPE);
431 *type = *ctype->base_type;
432 type->ctype.base_type = ctype->base_type;
433 type->type = SYM_RESTRICT;
434 type->ctype.modifiers &= ~MOD_SPECIFIER;
435 ctype->base_type = type;
436 create_fouled(type);
437 }
438 return 0;
439 }
440
441 static struct symbol * alloc_indirect_symbol(struct position pos, struct ctype *ctype, int type)
442 {
443 struct symbol *sym = alloc_symbol(pos, type);
444
445 sym->ctype.base_type = ctype->base_type;
446 sym->ctype.modifiers = ctype->modifiers & ~MOD_STORAGE;
447
448 ctype->base_type = sym;
449 ctype->modifiers &= MOD_STORAGE;
450 return sym;
451 }
452
453 static struct symbol *lookup_or_create_symbol(enum namespace ns, enum type type, struct token *token)
454 {
455 struct symbol *sym = lookup_symbol(token->ident, ns);
456 if (!sym) {
457 sym = alloc_symbol(token->pos, type);
458 bind_symbol(sym, token->ident, ns);
459 if (type == SYM_LABEL)
460 fn_local_symbol(sym);
461 }
462 return sym;
463 }
464
465 static struct symbol * local_label(struct token *token)
466 {
467 struct symbol *sym = lookup_symbol(token->ident, NS_SYMBOL);
468
469 if (sym && sym->ctype.modifiers & MOD_LABEL)
470 return sym;
471
472 return NULL;
473 }
474
475 /*
476 * NOTE! NS_LABEL is not just a different namespace,
477 * it also ends up using function scope instead of the
478 * regular symbol scope.
479 */
480 struct symbol *label_symbol(struct token *token)
481 {
482 struct symbol *sym = local_label(token);
483 if (sym)
484 return sym;
485 return lookup_or_create_symbol(NS_LABEL, SYM_LABEL, token);
486 }
487
488 static struct token *struct_union_enum_specifier(enum type type,
489 struct token *token, struct ctype *ctype,
490 struct token *(*parse)(struct token *, struct symbol *))
491 {
492 struct symbol *sym;
493 struct position *repos;
494
495 ctype->modifiers = 0;
496 token = handle_attributes(token, ctype, KW_ATTRIBUTE | KW_ASM);
497 if (token_type(token) == TOKEN_IDENT) {
498 sym = lookup_symbol(token->ident, NS_STRUCT);
499 if (!sym ||
500 (is_outer_scope(sym->scope) &&
501 (match_op(token->next,';') || match_op(token->next,'{')))) {
502 // Either a new symbol, or else an out-of-scope
503 // symbol being redefined.
504 sym = alloc_symbol(token->pos, type);
505 bind_symbol(sym, token->ident, NS_STRUCT);
506 }
507 if (sym->type != type)
508 error_die(token->pos, "invalid tag applied to %s", show_typename (sym));
509 ctype->base_type = sym;
510 repos = &token->pos;
511 token = token->next;
512 if (match_op(token, '{')) {
513 // The following test is actually wrong for empty
514 // structs, but (1) they are not C99, (2) gcc does
515 // the same thing, and (3) it's easier.
516 if (sym->symbol_list)
517 error_die(token->pos, "redefinition of %s", show_typename (sym));
518 sym->pos = *repos;
519 token = parse(token->next, sym);
520 token = expect(token, '}', "at end of struct-union-enum-specifier");
521
522 // Mark the structure as needing re-examination
523 sym->examined = 0;
524 sym->endpos = token->pos;
525 }
526 return token;
527 }
528
529 // private struct/union/enum type
530 if (!match_op(token, '{')) {
531 sparse_error(token->pos, "expected declaration");
532 ctype->base_type = &bad_ctype;
533 return token;
534 }
535
536 sym = alloc_symbol(token->pos, type);
537 token = parse(token->next, sym);
538 ctype->base_type = sym;
539 token = expect(token, '}', "at end of specifier");
540 sym->endpos = token->pos;
541
542 return token;
543 }
544
545 static struct token *parse_struct_declaration(struct token *token, struct symbol *sym)
546 {
547 struct symbol *field, *last = NULL;
548 struct token *res;
549 res = struct_declaration_list(token, &sym->symbol_list);
550 FOR_EACH_PTR(sym->symbol_list, field) {
551 if (!field->ident) {
552 struct symbol *base = field->ctype.base_type;
553 if (base && base->type == SYM_BITFIELD)
554 continue;
555 }
556 if (last)
557 last->next_subobject = field;
558 last = field;
559 } END_FOR_EACH_PTR(field);
560 return res;
561 }
562
563 static struct token *parse_union_declaration(struct token *token, struct symbol *sym)
564 {
565 return struct_declaration_list(token, &sym->symbol_list);
566 }
567
568 static struct token *struct_specifier(struct token *token, struct ctype *ctype)
569 {
570 return struct_union_enum_specifier(SYM_STRUCT, token, ctype, parse_struct_declaration);
571 }
572
573 static struct token *union_specifier(struct token *token, struct ctype *ctype)
574 {
575 return struct_union_enum_specifier(SYM_UNION, token, ctype, parse_union_declaration);
576 }
577
578
579 typedef struct {
580 int x;
581 unsigned long long y;
582 } Num;
583
584 static void upper_boundary(Num *n, Num *v)
585 {
586 if (n->x > v->x)
587 return;
588 if (n->x < v->x) {
589 *n = *v;
590 return;
591 }
592 if (n->y < v->y)
593 n->y = v->y;
594 }
595
596 static void lower_boundary(Num *n, Num *v)
597 {
598 if (n->x < v->x)
599 return;
600 if (n->x > v->x) {
601 *n = *v;
602 return;
603 }
604 if (n->y > v->y)
605 n->y = v->y;
606 }
607
608 static int type_is_ok(struct symbol *type, Num *upper, Num *lower)
609 {
610 int shift = type->bit_size;
611 int is_unsigned = type->ctype.modifiers & MOD_UNSIGNED;
612
613 if (!is_unsigned)
614 shift--;
615 if (upper->x == 0 && upper->y >> shift)
616 return 0;
617 if (lower->x == 0 || (!is_unsigned && (~lower->y >> shift) == 0))
618 return 1;
619 return 0;
620 }
621
622 static struct symbol *bigger_enum_type(struct symbol *s1, struct symbol *s2)
623 {
624 if (s1->bit_size < s2->bit_size) {
625 s1 = s2;
626 } else if (s1->bit_size == s2->bit_size) {
627 if (s2->ctype.modifiers & MOD_UNSIGNED)
628 s1 = s2;
629 }
630 if (s1->bit_size < bits_in_int)
631 return &int_ctype;
632 return s1;
633 }
634
635 static void cast_enum_list(struct symbol_list *list, struct symbol *base_type)
636 {
637 struct symbol *sym;
638
639 FOR_EACH_PTR(list, sym) {
640 struct expression *expr = sym->initializer;
641 struct symbol *ctype;
642 if (expr->type != EXPR_VALUE)
643 continue;
644 ctype = expr->ctype;
645 if (ctype->bit_size == base_type->bit_size)
646 continue;
647 cast_value(expr, base_type, expr, ctype);
648 } END_FOR_EACH_PTR(sym);
649 }
650
651 static struct token *parse_enum_declaration(struct token *token, struct symbol *parent)
652 {
653 unsigned long long lastval = 0;
654 struct symbol *ctype = NULL, *base_type = NULL;
655 Num upper = {-1, 0}, lower = {1, 0};
656
657 parent->examined = 1;
658 parent->ctype.base_type = &int_ctype;
659 while (token_type(token) == TOKEN_IDENT) {
660 struct expression *expr = NULL;
661 struct token *next = token->next;
662 struct symbol *sym;
663
664 sym = alloc_symbol(token->pos, SYM_NODE);
665 bind_symbol(sym, token->ident, NS_SYMBOL);
666 sym->ctype.modifiers &= ~MOD_ADDRESSABLE;
667
668 if (match_op(next, '=')) {
669 next = constant_expression(next->next, &expr);
670 lastval = get_expression_value(expr);
671 ctype = &void_ctype;
672 if (expr && expr->ctype)
673 ctype = expr->ctype;
674 } else if (!ctype) {
675 ctype = &int_ctype;
676 } else if (is_int_type(ctype)) {
677 lastval++;
678 } else {
679 error_die(token->pos, "can't increment the last enum member");
680 }
681
682 if (!expr) {
683 expr = alloc_expression(token->pos, EXPR_VALUE);
684 expr->value = lastval;
685 expr->ctype = ctype;
686 }
687
688 sym->initializer = expr;
689 sym->enum_member = 1;
690 sym->ctype.base_type = parent;
691 add_ptr_list(&parent->symbol_list, sym);
692
693 if (base_type != &bad_ctype) {
694 if (ctype->type == SYM_NODE)
695 ctype = ctype->ctype.base_type;
696 if (ctype->type == SYM_ENUM) {
697 if (ctype == parent)
698 ctype = base_type;
699 else
700 ctype = ctype->ctype.base_type;
701 }
702 /*
703 * base_type rules:
704 * - if all enums are of the same type, then
705 * the base_type is that type (two first
706 * cases)
707 * - if enums are of different types, they
708 * all have to be integer types, and the
709 * base type is at least "int_ctype".
710 * - otherwise the base_type is "bad_ctype".
711 */
712 if (!base_type) {
713 base_type = ctype;
714 } else if (ctype == base_type) {
715 /* nothing */
716 } else if (is_int_type(base_type) && is_int_type(ctype)) {
717 base_type = bigger_enum_type(base_type, ctype);
718 } else
719 base_type = &bad_ctype;
720 parent->ctype.base_type = base_type;
721 }
722 if (is_int_type(base_type)) {
723 Num v = {.y = lastval};
724 if (ctype->ctype.modifiers & MOD_UNSIGNED)
725 v.x = 0;
726 else if ((long long)lastval >= 0)
727 v.x = 0;
728 else
729 v.x = -1;
730 upper_boundary(&upper, &v);
731 lower_boundary(&lower, &v);
732 }
733 token = next;
734
735 sym->endpos = token->pos;
736
737 if (!match_op(token, ','))
738 break;
739 token = token->next;
740 }
741 if (!base_type) {
742 sparse_error(token->pos, "bad enum definition");
743 base_type = &bad_ctype;
744 }
745 else if (!is_int_type(base_type))
746 base_type = base_type;
747 else if (type_is_ok(base_type, &upper, &lower))
748 base_type = base_type;
749 else if (type_is_ok(&int_ctype, &upper, &lower))
750 base_type = &int_ctype;
751 else if (type_is_ok(&uint_ctype, &upper, &lower))
752 base_type = &uint_ctype;
753 else if (type_is_ok(&long_ctype, &upper, &lower))
754 base_type = &long_ctype;
755 else if (type_is_ok(&ulong_ctype, &upper, &lower))
756 base_type = &ulong_ctype;
757 else if (type_is_ok(&llong_ctype, &upper, &lower))
758 base_type = &llong_ctype;
759 else if (type_is_ok(&ullong_ctype, &upper, &lower))
760 base_type = &ullong_ctype;
761 else
762 base_type = &bad_ctype;
763 parent->ctype.base_type = base_type;
764 parent->ctype.modifiers |= (base_type->ctype.modifiers & MOD_UNSIGNED);
765 parent->examined = 0;
766
767 cast_enum_list(parent->symbol_list, base_type);
768
769 return token;
770 }
771
772 static struct token *enum_specifier(struct token *token, struct ctype *ctype)
773 {
774 struct token *ret = struct_union_enum_specifier(SYM_ENUM, token, ctype, parse_enum_declaration);
775
776 ctype = &ctype->base_type->ctype;
777 if (!ctype->base_type)
778 ctype->base_type = &incomplete_ctype;
779
780 return ret;
781 }
782
783 static struct token *typeof_specifier(struct token *token, struct ctype *ctype)
784 {
785 struct symbol *sym;
786
787 if (!match_op(token, '(')) {
788 sparse_error(token->pos, "expected '(' after typeof");
789 return token;
790 }
791 if (lookup_type(token->next)) {
792 token = typename(token->next, &sym, 0);
793 *ctype = sym->ctype;
794 } else {
795 struct symbol *typeof_sym = alloc_symbol(token->pos, SYM_TYPEOF);
796 token = parse_expression(token->next, &typeof_sym->initializer);
797
798 ctype->modifiers = 0;
799 typeof_sym->endpos = token->pos;
800 ctype->base_type = typeof_sym;
801 }
802 return expect(token, ')', "after typeof");
803 }
804
805 static struct token *ignore_attribute(struct token *token, struct symbol *attr, struct ctype *ctype)
806 {
807 struct expression *expr = NULL;
808 if (match_op(token, '('))
809 token = parens_expression(token, &expr, "in attribute");
810 return token;
811 }
812
813 static struct token *attribute_packed(struct token *token, struct symbol *attr, struct ctype *ctype)
814 {
815 ctype->alignment = 1;
816 return token;
817 }
818
819 static struct token *attribute_aligned(struct token *token, struct symbol *attr, struct ctype *ctype)
820 {
821 int alignment = max_alignment;
822 struct expression *expr = NULL;
823
824 if (match_op(token, '(')) {
825 token = parens_expression(token, &expr, "in attribute");
826 if (expr)
827 alignment = const_expression_value(expr);
828 }
829 ctype->alignment = alignment;
830 return token;
831 }
832
833 static struct token *attribute_modifier(struct token *token, struct symbol *attr, struct ctype *ctype)
834 {
835 ctype->modifiers |= attr->ctype.modifiers;
836 return token;
837 }
838
839 static struct token *attribute_address_space(struct token *token, struct symbol *attr, struct ctype *ctype)
840 {
841 struct expression *expr = NULL;
842 token = expect(token, '(', "after address_space attribute");
843 token = conditional_expression(token, &expr);
844 if (expr)
845 ctype->as = const_expression_value(expr);
846 token = expect(token, ')', "after address_space attribute");
847 return token;
848 }
849
850 static struct token *attribute_mode(struct token *token, struct symbol *attr, struct ctype *ctype)
851 {
852 token = expect(token, '(', "after mode attribute");
853 if (token_type(token) == TOKEN_IDENT) {
854 struct symbol *mode = lookup_keyword(token->ident, NS_KEYWORD);
855 if (mode && mode->op->type == KW_MODE)
856 ctype->modifiers |= mode->ctype.modifiers;
857 else
858 sparse_error(token->pos, "unknown mode attribute %s\n", show_ident(token->ident));
859 token = token->next;
860 } else
861 sparse_error(token->pos, "expect attribute mode symbol\n");
862 token = expect(token, ')', "after mode attribute");
863 return token;
864 }
865
866 static struct token *attribute_context(struct token *token, struct symbol *attr, struct ctype *ctype)
867 {
868 struct context *context = alloc_context();
869 struct expression *args[3];
870 int argc = 0;
871
872 token = expect(token, '(', "after context attribute");
873 while (!match_op(token, ')')) {
874 struct expression *expr = NULL;
875 token = conditional_expression(token, &expr);
876 if (!expr)
877 break;
878 if (argc < 3)
879 args[argc++] = expr;
880 if (!match_op(token, ','))
881 break;
882 token = token->next;
883 }
884
885 switch(argc) {
886 case 0:
887 sparse_error(token->pos, "expected context input/output values");
888 break;
889 case 1:
890 context->in = get_expression_value(args[0]);
891 break;
892 case 2:
893 context->in = get_expression_value(args[0]);
894 context->out = get_expression_value(args[1]);
895 break;
896 case 3:
897 context->context = args[0];
898 context->in = get_expression_value(args[1]);
899 context->out = get_expression_value(args[2]);
900 break;
901 }
902
903 if (argc)
904 add_ptr_list(&ctype->contexts, context);
905
906 token = expect(token, ')', "after context attribute");
907 return token;
908 }
909
910 static struct token *attribute_transparent_union(struct token *token, struct symbol *attr, struct ctype *ctype)
911 {
912 if (Wtransparent_union)
913 warning(token->pos, "ignoring attribute __transparent_union__");
914 return token;
915 }
916
917 static struct token *recover_unknown_attribute(struct token *token)
918 {
919 struct expression *expr = NULL;
920
921 sparse_error(token->pos, "attribute '%s': unknown attribute", show_ident(token->ident));
922 token = token->next;
923 if (match_op(token, '('))
924 token = parens_expression(token, &expr, "in attribute");
925 return token;
926 }
927
928 static struct token *attribute_specifier(struct token *token, struct ctype *ctype)
929 {
930 ctype->modifiers = 0;
931 token = expect(token, '(', "after attribute");
932 token = expect(token, '(', "after attribute");
933
934 for (;;) {
935 struct ident *attribute_name;
936 struct symbol *attr;
937
938 if (eof_token(token))
939 break;
940 if (match_op(token, ';'))
941 break;
942 if (token_type(token) != TOKEN_IDENT)
943 break;
944 attribute_name = token->ident;
945 attr = lookup_keyword(attribute_name, NS_KEYWORD);
946 if (attr && attr->op->attribute)
947 token = attr->op->attribute(token->next, attr, ctype);
948 else
949 token = recover_unknown_attribute(token);
950
951 if (!match_op(token, ','))
952 break;
953 token = token->next;
954 }
955
956 token = expect(token, ')', "after attribute");
957 token = expect(token, ')', "after attribute");
958 return token;
959 }
960
961 struct symbol * ctype_integer(unsigned long spec)
962 {
963 static struct symbol *const integer_ctypes[][3] = {
964 { &llong_ctype, &sllong_ctype, &ullong_ctype },
965 { &long_ctype, &slong_ctype, &ulong_ctype },
966 { &short_ctype, &sshort_ctype, &ushort_ctype },
967 { &char_ctype, &schar_ctype, &uchar_ctype },
968 { &int_ctype, &sint_ctype, &uint_ctype },
969 };
970 struct symbol *const (*ctype)[3];
971 int sub;
972
973 ctype = integer_ctypes;
974 if (!(spec & MOD_LONGLONG)) {
975 ctype++;
976 if (!(spec & MOD_LONG)) {
977 ctype++;
978 if (!(spec & MOD_SHORT)) {
979 ctype++;
980 if (!(spec & MOD_CHAR))
981 ctype++;
982 }
983 }
984 }
985
986 sub = ((spec & MOD_UNSIGNED)
987 ? 2
988 : ((spec & MOD_EXPLICITLY_SIGNED)
989 ? 1
990 : 0));
991
992 return ctype[0][sub];
993 }
994
995 struct symbol * ctype_fp(unsigned long spec)
996 {
997 if (spec & MOD_LONGLONG)
998 return &ldouble_ctype;
999 if (spec & MOD_LONG)
1000 return &double_ctype;
1001 return &float_ctype;
1002 }
1003
1004 static void apply_ctype(struct position pos, struct ctype *thistype, struct ctype *ctype)
1005 {
1006 unsigned long mod = thistype->modifiers;
1007
1008 if (mod) {
1009 unsigned long old = ctype->modifiers;
1010 unsigned long extra = 0, dup, conflict;
1011
1012 if (mod & old & MOD_LONG) {
1013 extra = MOD_LONGLONG | MOD_LONG;
1014 mod &= ~MOD_LONG;
1015 old &= ~MOD_LONG;
1016 }
1017 dup = (mod & old) | (extra & old) | (extra & mod);
1018 if (dup)
1019 sparse_error(pos, "Just how %sdo you want this type to be?",
1020 modifier_string(dup));
1021
1022 conflict = !(~mod & ~old & (MOD_LONG | MOD_SHORT));
1023 if (conflict)
1024 sparse_error(pos, "You cannot have both long and short modifiers.");
1025
1026 conflict = !(~mod & ~old & (MOD_SIGNED | MOD_UNSIGNED));
1027 if (conflict)
1028 sparse_error(pos, "You cannot have both signed and unsigned modifiers.");
1029
1030 // Only one storage modifier allowed, except that "inline" doesn't count.
1031 conflict = (mod | old) & (MOD_STORAGE & ~MOD_INLINE);
1032 conflict &= (conflict - 1);
1033 if (conflict)
1034 sparse_error(pos, "multiple storage classes");
1035
1036 ctype->modifiers = old | mod | extra;
1037 }
1038
1039 /* Context */
1040 concat_ptr_list((struct ptr_list *)thistype->contexts,
1041 (struct ptr_list **)&ctype->contexts);
1042
1043 /* Alignment */
1044 if (thistype->alignment & (thistype->alignment-1)) {
1045 warning(pos, "I don't like non-power-of-2 alignments");
1046 thistype->alignment = 0;
1047 }
1048 if (thistype->alignment > ctype->alignment)
1049 ctype->alignment = thistype->alignment;
1050
1051 /* Address space */
1052 if (thistype->as)
1053 ctype->as = thistype->as;
1054 }
1055
1056 static void check_modifiers(struct position *pos, struct symbol *s, unsigned long mod)
1057 {
1058 unsigned long banned, wrong;
1059 const unsigned long BANNED_SIZE = MOD_LONG | MOD_LONGLONG | MOD_SHORT;
1060 const unsigned long BANNED_SIGN = MOD_SIGNED | MOD_UNSIGNED;
1061
1062 if (s->type == SYM_KEYWORD)
1063 banned = s->op->type == KW_SPECIFIER ? (BANNED_SIZE | BANNED_SIGN) : 0;
1064 else if (s->ctype.base_type == &fp_type)
1065 banned = BANNED_SIGN;
1066 else if (s->ctype.base_type == &int_type || !s->ctype.base_type || is_int_type (s))
1067 banned = 0;
1068 else {
1069 // label_type
1070 // void_type
1071 // bad_type
1072 // vector_type <-- whatever that is
1073 banned = BANNED_SIZE | BANNED_SIGN;
1074 }
1075
1076 wrong = mod & banned;
1077 if (wrong)
1078 sparse_error(*pos, "modifier %sis invalid in this context",
1079 modifier_string (wrong));
1080 }
1081
1082 static struct token *declaration_specifiers(struct token *next, struct ctype *ctype, int qual)
1083 {
1084 struct token *token;
1085
1086 while ( (token = next) != NULL ) {
1087 struct ctype thistype;
1088 struct ident *ident;
1089 struct symbol *s, *type;
1090 unsigned long mod;
1091
1092 next = token->next;
1093 if (token_type(token) != TOKEN_IDENT)
1094 break;
1095 ident = token->ident;
1096
1097 s = lookup_symbol(ident, NS_TYPEDEF);
1098 if (!s)
1099 break;
1100 thistype = s->ctype;
1101 mod = thistype.modifiers;
1102 if (qual) {
1103 if (s->type != SYM_KEYWORD)
1104 break;
1105 if (!(s->op->type & (KW_ATTRIBUTE | KW_QUALIFIER)))
1106 break;
1107 }
1108 if (s->type == SYM_KEYWORD && s->op->declarator) {
1109 next = s->op->declarator(next, &thistype);
1110 mod = thistype.modifiers;
1111 }
1112 type = thistype.base_type;
1113 if (type) {
1114 if (qual)
1115 break;
1116 if (ctype->base_type)
1117 break;
1118 /* User types only mix with qualifiers */
1119 if (mod & MOD_USERTYPE) {
1120 if (ctype->modifiers & MOD_SPECIFIER)
1121 break;
1122 }
1123 ctype->base_type = type;
1124 }
1125
1126 check_modifiers(&token->pos, s, ctype->modifiers);
1127 apply_ctype(token->pos, &thistype, ctype);
1128 }
1129
1130 if (!ctype->base_type) {
1131 struct symbol *base = &incomplete_ctype;
1132
1133 /*
1134 * If we have modifiers, we'll default to an integer
1135 * type, and "ctype_integer()" will turn this into
1136 * a specific one.
1137 */
1138 if (ctype->modifiers & MOD_SPECIFIER)
1139 base = &int_type;
1140 ctype->base_type = base;
1141 }
1142 return token;
1143 }
1144
1145 static struct token *abstract_array_declarator(struct token *token, struct symbol *sym)
1146 {
1147 struct expression *expr = NULL;
1148
1149 token = parse_expression(token, &expr);
1150 sym->array_size = expr;
1151 return token;
1152 }
1153
1154 static struct token *parameter_type_list(struct token *, struct symbol *, struct ident **p);
1155 static struct token *declarator(struct token *token, struct symbol *sym, struct ident **p);
1156
1157 static struct token *handle_attributes(struct token *token, struct ctype *ctype, unsigned int keywords)
1158 {
1159 struct symbol *keyword;
1160 for (;;) {
1161 struct ctype thistype = { 0, };
1162 if (token_type(token) != TOKEN_IDENT)
1163 break;
1164 keyword = lookup_keyword(token->ident, NS_KEYWORD | NS_TYPEDEF);
1165 if (!keyword || keyword->type != SYM_KEYWORD)
1166 break;
1167 if (!(keyword->op->type & keywords))
1168 break;
1169 token = keyword->op->declarator(token->next, &thistype);
1170 apply_ctype(token->pos, &thistype, ctype);
1171 }
1172 return token;
1173 }
1174
1175 static struct token *direct_declarator(struct token *token, struct symbol *decl, struct ident **p)
1176 {
1177 struct ctype *ctype = &decl->ctype;
1178
1179 if (p && token_type(token) == TOKEN_IDENT) {
1180 *p = token->ident;
1181 token = token->next;
1182 }
1183
1184 for (;;) {
1185 token = handle_attributes(token, ctype, KW_ATTRIBUTE | KW_ASM);
1186
1187 if (token_type(token) != TOKEN_SPECIAL)
1188 return token;
1189
1190 /*
1191 * This can be either a parameter list or a grouping.
1192 * For the direct (non-abstract) case, we know if must be
1193 * a parameter list if we already saw the identifier.
1194 * For the abstract case, we know if must be a parameter
1195 * list if it is empty or starts with a type.
1196 */
1197 if (token->special == '(') {
1198 struct symbol *sym;
1199 struct token *next = token->next;
1200 int fn;
1201
1202 next = handle_attributes(next, ctype, KW_ATTRIBUTE);
1203 fn = (p && *p) || match_op(next, ')') || lookup_type(next);
1204
1205 if (!fn) {
1206 struct symbol *base_type = ctype->base_type;
1207 token = declarator(next, decl, p);
1208 token = expect(token, ')', "in nested declarator");
1209 while (ctype->base_type != base_type)
1210 ctype = &ctype->base_type->ctype;
1211 p = NULL;
1212 continue;
1213 }
1214
1215 sym = alloc_indirect_symbol(token->pos, ctype, SYM_FN);
1216 token = parameter_type_list(next, sym, p);
1217 token = expect(token, ')', "in function declarator");
1218 sym->endpos = token->pos;
1219 continue;
1220 }
1221 if (token->special == '[') {
1222 struct symbol *array = alloc_indirect_symbol(token->pos, ctype, SYM_ARRAY);
1223 token = abstract_array_declarator(token->next, array);
1224 token = expect(token, ']', "in abstract_array_declarator");
1225 array->endpos = token->pos;
1226 ctype = &array->ctype;
1227 continue;
1228 }
1229 break;
1230 }
1231 return token;
1232 }
1233
1234 static struct token *pointer(struct token *token, struct ctype *ctype)
1235 {
1236 unsigned long modifiers;
1237 struct symbol *base_type;
1238
1239 modifiers = ctype->modifiers & ~MOD_TYPEDEF;
1240 base_type = ctype->base_type;
1241 ctype->modifiers = modifiers;
1242
1243 while (match_op(token,'*')) {
1244 struct symbol *ptr = alloc_symbol(token->pos, SYM_PTR);
1245 ptr->ctype.modifiers = modifiers & ~MOD_STORAGE;
1246 ptr->ctype.as = ctype->as;
1247 concat_ptr_list((struct ptr_list *)ctype->contexts,
1248 (struct ptr_list **)&ptr->ctype.contexts);
1249 ptr->ctype.base_type = base_type;
1250
1251 base_type = ptr;
1252 ctype->modifiers = modifiers & MOD_STORAGE;
1253 ctype->base_type = base_type;
1254 ctype->as = 0;
1255 free_ptr_list(&ctype->contexts);
1256
1257 token = declaration_specifiers(token->next, ctype, 1);
1258 modifiers = ctype->modifiers;
1259 ctype->base_type->endpos = token->pos;
1260 }
1261 return token;
1262 }
1263
1264 static struct token *declarator(struct token *token, struct symbol *sym, struct ident **p)
1265 {
1266 token = pointer(token, &sym->ctype);
1267 return direct_declarator(token, sym, p);
1268 }
1269
1270 static struct token *handle_bitfield(struct token *token, struct symbol *decl)
1271 {
1272 struct ctype *ctype = &decl->ctype;
1273 struct expression *expr;
1274 struct symbol *bitfield;
1275 long long width;
1276
1277 if (ctype->base_type != &int_type && !is_int_type(ctype->base_type)) {
1278 sparse_error(token->pos, "invalid bitfield specifier for type %s.",
1279 show_typename(ctype->base_type));
1280 // Parse this to recover gracefully.
1281 return conditional_expression(token->next, &expr);
1282 }
1283
1284 bitfield = alloc_indirect_symbol(token->pos, ctype, SYM_BITFIELD);
1285 token = conditional_expression(token->next, &expr);
1286 width = const_expression_value(expr);
1287 bitfield->bit_size = width;
1288
1289 if (width < 0 || width > INT_MAX) {
1290 sparse_error(token->pos, "invalid bitfield width, %lld.", width);
1291 width = -1;
1292 } else if (decl->ident && width == 0) {
1293 sparse_error(token->pos, "invalid named zero-width bitfield `%s'",
1294 show_ident(decl->ident));
1295 width = -1;
1296 } else if (decl->ident) {
1297 struct symbol *base_type = bitfield->ctype.base_type;
1298 struct symbol *bitfield_type = base_type == &int_type ? bitfield : base_type;
1299 int is_signed = !(bitfield_type->ctype.modifiers & MOD_UNSIGNED);
1300 if (Wone_bit_signed_bitfield && width == 1 && is_signed) {
1301 // Valid values are either {-1;0} or {0}, depending on integer
1302 // representation. The latter makes for very efficient code...
1303 sparse_error(token->pos, "dubious one-bit signed bitfield");
1304 }
1305 if (Wdefault_bitfield_sign &&
1306 bitfield_type->type != SYM_ENUM &&
1307 !(bitfield_type->ctype.modifiers & MOD_EXPLICITLY_SIGNED) &&
1308 is_signed) {
1309 // The sign of bitfields is unspecified by default.
1310 warning(token->pos, "dubious bitfield without explicit `signed' or `unsigned'");
1311 }
1312 }
1313 bitfield->bit_size = width;
1314 bitfield->endpos = token->pos;
1315 return token;
1316 }
1317
1318 static struct token *declaration_list(struct token *token, struct symbol_list **list)
1319 {
1320 struct ctype ctype = {0, };
1321
1322 token = declaration_specifiers(token, &ctype, 0);
1323 for (;;) {
1324 struct ident *ident = NULL;
1325 struct symbol *decl = alloc_symbol(token->pos, SYM_NODE);
1326 decl->ctype = ctype;
1327 token = declarator(token, decl, &ident);
1328 decl->ident = ident;
1329 if (match_op(token, ':')) {
1330 token = handle_bitfield(token, decl);
1331 token = handle_attributes(token, &decl->ctype, KW_ATTRIBUTE | KW_ASM);
1332 }
1333 apply_modifiers(token->pos, &decl->ctype);
1334 add_symbol(list, decl);
1335 decl->endpos = token->pos;
1336 if (!match_op(token, ','))
1337 break;
1338 token = token->next;
1339 }
1340 return token;
1341 }
1342
1343 static struct token *struct_declaration_list(struct token *token, struct symbol_list **list)
1344 {
1345 while (!match_op(token, '}')) {
1346 if (!match_op(token, ';'))
1347 token = declaration_list(token, list);
1348 if (!match_op(token, ';')) {
1349 sparse_error(token->pos, "expected ; at end of declaration");
1350 break;
1351 }
1352 token = token->next;
1353 }
1354 return token;
1355 }
1356
1357 static struct token *parameter_declaration(struct token *token, struct symbol **tree)
1358 {
1359 struct ident *ident = NULL;
1360 struct symbol *sym;
1361 struct ctype ctype = { 0, };
1362
1363 token = declaration_specifiers(token, &ctype, 0);
1364 sym = alloc_symbol(token->pos, SYM_NODE);
1365 sym->ctype = ctype;
1366 *tree = sym;
1367 token = declarator(token, sym, &ident);
1368 sym->ident = ident;
1369 apply_modifiers(token->pos, &sym->ctype);
1370 sym->endpos = token->pos;
1371 return token;
1372 }
1373
1374 struct token *typename(struct token *token, struct symbol **p, int mod)
1375 {
1376 struct symbol *sym = alloc_symbol(token->pos, SYM_NODE);
1377 *p = sym;
1378 token = declaration_specifiers(token, &sym->ctype, 0);
1379 token = declarator(token, sym, NULL);
1380 apply_modifiers(token->pos, &sym->ctype);
1381 if (sym->ctype.modifiers & MOD_STORAGE & ~mod)
1382 warning(sym->pos, "storage class in typename (%s)",
1383 show_typename(sym));
1384 sym->endpos = token->pos;
1385 return token;
1386 }
1387
1388 static struct token *expression_statement(struct token *token, struct expression **tree)
1389 {
1390 token = parse_expression(token, tree);
1391 return expect(token, ';', "at end of statement");
1392 }
1393
1394 static struct token *parse_asm_operands(struct token *token, struct statement *stmt,
1395 struct expression_list **inout)
1396 {
1397 struct expression *expr;
1398
1399 /* Allow empty operands */
1400 if (match_op(token->next, ':') || match_op(token->next, ')'))
1401 return token->next;
1402 do {
1403 struct ident *ident = NULL;
1404 if (match_op(token->next, '[') &&
1405 token_type(token->next->next) == TOKEN_IDENT &&
1406 match_op(token->next->next->next, ']')) {
1407 ident = token->next->next->ident;
1408 token = token->next->next->next;
1409 }
1410 add_expression(inout, (struct expression *)ident); /* UGGLEE!!! */
1411 token = primary_expression(token->next, &expr);
1412 add_expression(inout, expr);
1413 token = parens_expression(token, &expr, "in asm parameter");
1414 add_expression(inout, expr);
1415 } while (match_op(token, ','));
1416 return token;
1417 }
1418
1419 static struct token *parse_asm_clobbers(struct token *token, struct statement *stmt,
1420 struct expression_list **clobbers)
1421 {
1422 struct expression *expr;
1423
1424 do {
1425 token = primary_expression(token->next, &expr);
1426 add_expression(clobbers, expr);
1427 } while (match_op(token, ','));
1428 return token;
1429 }
1430
1431 static struct token *parse_asm_statement(struct token *token, struct statement *stmt)
1432 {
1433 token = token->next;
1434 stmt->type = STMT_ASM;
1435 if (match_idents(token, &__volatile___ident, &__volatile_ident, &volatile_ident, NULL)) {
1436 token = token->next;
1437 }
1438 token = expect(token, '(', "after asm");
1439 token = parse_expression(token, &stmt->asm_string);
1440 if (match_op(token, ':'))
1441 token = parse_asm_operands(token, stmt, &stmt->asm_outputs);
1442 if (match_op(token, ':'))
1443 token = parse_asm_operands(token, stmt, &stmt->asm_inputs);
1444 if (match_op(token, ':'))
1445 token = parse_asm_clobbers(token, stmt, &stmt->asm_clobbers);
1446 token = expect(token, ')', "after asm");
1447 return expect(token, ';', "at end of asm-statement");
1448 }
1449
1450 static struct token *parse_asm_declarator(struct token *token, struct ctype *ctype)
1451 {
1452 struct expression *expr;
1453 token = expect(token, '(', "after asm");
1454 token = parse_expression(token->next, &expr);
1455 token = expect(token, ')', "after asm");
1456 return token;
1457 }
1458
1459 /* Make a statement out of an expression */
1460 static struct statement *make_statement(struct expression *expr)
1461 {
1462 struct statement *stmt;
1463
1464 if (!expr)
1465 return NULL;
1466 stmt = alloc_statement(expr->pos, STMT_EXPRESSION);
1467 stmt->expression = expr;
1468 return stmt;
1469 }
1470
1471 /*
1472 * All iterators have two symbols associated with them:
1473 * the "continue" and "break" symbols, which are targets
1474 * for continue and break statements respectively.
1475 *
1476 * They are in a special name-space, but they follow
1477 * all the normal visibility rules, so nested iterators
1478 * automatically work right.
1479 */
1480 static void start_iterator(struct statement *stmt)
1481 {
1482 struct symbol *cont, *brk;
1483
1484 start_symbol_scope();
1485 cont = alloc_symbol(stmt->pos, SYM_NODE);
1486 bind_symbol(cont, &continue_ident, NS_ITERATOR);
1487 brk = alloc_symbol(stmt->pos, SYM_NODE);
1488 bind_symbol(brk, &break_ident, NS_ITERATOR);
1489
1490 stmt->type = STMT_ITERATOR;
1491 stmt->iterator_break = brk;
1492 stmt->iterator_continue = cont;
1493 fn_local_symbol(brk);
1494 fn_local_symbol(cont);
1495 }
1496
1497 static void end_iterator(struct statement *stmt)
1498 {
1499 end_symbol_scope();
1500 }
1501
1502 static struct statement *start_function(struct symbol *sym)
1503 {
1504 struct symbol *ret;
1505 struct statement *stmt = alloc_statement(sym->pos, STMT_COMPOUND);
1506
1507 start_function_scope();
1508 ret = alloc_symbol(sym->pos, SYM_NODE);
1509 ret->ctype = sym->ctype.base_type->ctype;
1510 ret->ctype.modifiers &= ~(MOD_STORAGE | MOD_CONST | MOD_VOLATILE | MOD_INLINE | MOD_ADDRESSABLE | MOD_NOCAST | MOD_NODEREF | MOD_ACCESSED | MOD_TOPLEVEL);
1511 ret->ctype.modifiers |= (MOD_AUTO | MOD_REGISTER);
1512 bind_symbol(ret, &return_ident, NS_ITERATOR);
1513 stmt->ret = ret;
1514 fn_local_symbol(ret);
1515
1516 // Currently parsed symbol for __func__/__FUNCTION__/__PRETTY_FUNCTION__
1517 current_fn = sym;
1518
1519 return stmt;
1520 }
1521
1522 static void end_function(struct symbol *sym)
1523 {
1524 current_fn = NULL;
1525 end_function_scope();
1526 }
1527
1528 /*
1529 * A "switch()" statement, like an iterator, has a
1530 * the "break" symbol associated with it. It works
1531 * exactly like the iterator break - it's the target
1532 * for any break-statements in scope, and means that
1533 * "break" handling doesn't even need to know whether
1534 * it's breaking out of an iterator or a switch.
1535 *
1536 * In addition, the "case" symbol is a marker for the
1537 * case/default statements to find the switch statement
1538 * that they are associated with.
1539 */
1540 static void start_switch(struct statement *stmt)
1541 {
1542 struct symbol *brk, *switch_case;
1543
1544 start_symbol_scope();
1545 brk = alloc_symbol(stmt->pos, SYM_NODE);
1546 bind_symbol(brk, &break_ident, NS_ITERATOR);
1547
1548 switch_case = alloc_symbol(stmt->pos, SYM_NODE);
1549 bind_symbol(switch_case, &case_ident, NS_ITERATOR);
1550 switch_case->stmt = stmt;
1551
1552 stmt->type = STMT_SWITCH;
1553 stmt->switch_break = brk;
1554 stmt->switch_case = switch_case;
1555
1556 fn_local_symbol(brk);
1557 fn_local_symbol(switch_case);
1558 }
1559
1560 static void end_switch(struct statement *stmt)
1561 {
1562 if (!stmt->switch_case->symbol_list)
1563 warning(stmt->pos, "switch with no cases");
1564 end_symbol_scope();
1565 }
1566
1567 static void add_case_statement(struct statement *stmt)
1568 {
1569 struct symbol *target = lookup_symbol(&case_ident, NS_ITERATOR);
1570 struct symbol *sym;
1571
1572 if (!target) {
1573 sparse_error(stmt->pos, "not in switch scope");
1574 stmt->type = STMT_NONE;
1575 return;
1576 }
1577 sym = alloc_symbol(stmt->pos, SYM_NODE);
1578 add_symbol(&target->symbol_list, sym);
1579 sym->stmt = stmt;
1580 stmt->case_label = sym;
1581 fn_local_symbol(sym);
1582 }
1583
1584 static struct token *parse_return_statement(struct token *token, struct statement *stmt)
1585 {
1586 struct symbol *target = lookup_symbol(&return_ident, NS_ITERATOR);
1587
1588 if (!target)
1589 error_die(token->pos, "internal error: return without a function target");
1590 stmt->type = STMT_RETURN;
1591 stmt->ret_target = target;
1592 return expression_statement(token->next, &stmt->ret_value);
1593 }
1594
1595 static struct token *parse_for_statement(struct token *token, struct statement *stmt)
1596 {
1597 struct symbol_list *syms;
1598 struct expression *e1, *e2, *e3;
1599 struct statement *iterator;
1600
1601 start_iterator(stmt);
1602 token = expect(token->next, '(', "after 'for'");
1603
1604 syms = NULL;
1605 e1 = NULL;
1606 /* C99 variable declaration? */
1607 if (lookup_type(token)) {
1608 token = external_declaration(token, &syms);
1609 } else {
1610 token = parse_expression(token, &e1);
1611 token = expect(token, ';', "in 'for'");
1612 }
1613 token = parse_expression(token, &e2);
1614 token = expect(token, ';', "in 'for'");
1615 token = parse_expression(token, &e3);
1616 token = expect(token, ')', "in 'for'");
1617 token = statement(token, &iterator);
1618
1619 stmt->iterator_syms = syms;
1620 stmt->iterator_pre_statement = make_statement(e1);
1621 stmt->iterator_pre_condition = e2;
1622 stmt->iterator_post_statement = make_statement(e3);
1623 stmt->iterator_post_condition = NULL;
1624 stmt->iterator_statement = iterator;
1625 end_iterator(stmt);
1626
1627 return token;
1628 }
1629
1630 static struct token *parse_while_statement(struct token *token, struct statement *stmt)
1631 {
1632 struct expression *expr;
1633 struct statement *iterator;
1634
1635 start_iterator(stmt);
1636 token = parens_expression(token->next, &expr, "after 'while'");
1637 token = statement(token, &iterator);
1638
1639 stmt->iterator_pre_condition = expr;
1640 stmt->iterator_post_condition = NULL;
1641 stmt->iterator_statement = iterator;
1642 end_iterator(stmt);
1643
1644 return token;
1645 }
1646
1647 static struct token *parse_do_statement(struct token *token, struct statement *stmt)
1648 {
1649 struct expression *expr;
1650 struct statement *iterator;
1651
1652 start_iterator(stmt);
1653 token = statement(token->next, &iterator);
1654 if (token_type(token) == TOKEN_IDENT && token->ident == &while_ident)
1655 token = token->next;
1656 else
1657 sparse_error(token->pos, "expected 'while' after 'do'");
1658 token = parens_expression(token, &expr, "after 'do-while'");
1659
1660 stmt->iterator_post_condition = expr;
1661 stmt->iterator_statement = iterator;
1662 end_iterator(stmt);
1663
1664 if (iterator && iterator->type != STMT_COMPOUND && Wdo_while)
1665 warning(iterator->pos, "do-while statement is not a compound statement");
1666
1667 return expect(token, ';', "after statement");
1668 }
1669
1670 static struct token *parse_if_statement(struct token *token, struct statement *stmt)
1671 {
1672 stmt->type = STMT_IF;
1673 token = parens_expression(token->next, &stmt->if_conditional, "after if");
1674 token = statement(token, &stmt->if_true);
1675 if (token_type(token) != TOKEN_IDENT)
1676 return token;
1677 if (token->ident != &else_ident)
1678 return token;
1679 return statement(token->next, &stmt->if_false);
1680 }
1681
1682 static inline struct token *case_statement(struct token *token, struct statement *stmt)
1683 {
1684 stmt->type = STMT_CASE;
1685 token = expect(token, ':', "after default/case");
1686 add_case_statement(stmt);
1687 return statement(token, &stmt->case_statement);
1688 }
1689
1690 static struct token *parse_case_statement(struct token *token, struct statement *stmt)
1691 {
1692 token = parse_expression(token->next, &stmt->case_expression);
1693 if (match_op(token, SPECIAL_ELLIPSIS))
1694 token = parse_expression(token->next, &stmt->case_to);
1695 return case_statement(token, stmt);
1696 }
1697
1698 static struct token *parse_default_statement(struct token *token, struct statement *stmt)
1699 {
1700 return case_statement(token->next, stmt);
1701 }
1702
1703 static struct token *parse_loop_iterator(struct token *token, struct statement *stmt)
1704 {
1705 struct symbol *target = lookup_symbol(token->ident, NS_ITERATOR);
1706 stmt->type = STMT_GOTO;
1707 stmt->goto_label = target;
1708 if (!target)
1709 sparse_error(stmt->pos, "break/continue not in iterator scope");
1710 return expect(token->next, ';', "at end of statement");
1711 }
1712
1713 static struct token *parse_switch_statement(struct token *token, struct statement *stmt)
1714 {
1715 stmt->type = STMT_SWITCH;
1716 start_switch(stmt);
1717 token = parens_expression(token->next, &stmt->switch_expression, "after 'switch'");
1718 token = statement(token, &stmt->switch_statement);
1719 end_switch(stmt);
1720 return token;
1721 }
1722
1723 static struct token *parse_goto_statement(struct token *token, struct statement *stmt)
1724 {
1725 stmt->type = STMT_GOTO;
1726 token = token->next;
1727 if (match_op(token, '*')) {
1728 token = parse_expression(token->next, &stmt->goto_expression);
1729 add_statement(&function_computed_goto_list, stmt);
1730 } else if (token_type(token) == TOKEN_IDENT) {
1731 stmt->goto_label = label_symbol(token);
1732 token = token->next;
1733 } else {
1734 sparse_error(token->pos, "Expected identifier or goto expression");
1735 }
1736 return expect(token, ';', "at end of statement");
1737 }
1738
1739 static struct token *parse_context_statement(struct token *token, struct statement *stmt)
1740 {
1741 stmt->type = STMT_CONTEXT;
1742 token = parse_expression(token->next, &stmt->expression);
1743 if(stmt->expression->type == EXPR_PREOP
1744 && stmt->expression->op == '('
1745 && stmt->expression->unop->type == EXPR_COMMA) {
1746 struct expression *expr;
1747 expr = stmt->expression->unop;
1748 stmt->context = expr->left;
1749 stmt->expression = expr->right;
1750 }
1751 return expect(token, ';', "at end of statement");
1752 }
1753
1754 static struct token *parse_range_statement(struct token *token, struct statement *stmt)
1755 {
1756 stmt->type = STMT_RANGE;
1757 token = assignment_expression(token->next, &stmt->range_expression);
1758 token = expect(token, ',', "after range expression");
1759 token = assignment_expression(token, &stmt->range_low);
1760 token = expect(token, ',', "after low range");
1761 token = assignment_expression(token, &stmt->range_high);
1762 return expect(token, ';', "after range statement");
1763 }
1764
1765 static struct token *statement(struct token *token, struct statement **tree)
1766 {
1767 struct statement *stmt = alloc_statement(token->pos, STMT_NONE);
1768
1769 *tree = stmt;
1770 if (token_type(token) == TOKEN_IDENT) {
1771 struct symbol *s = lookup_keyword(token->ident, NS_KEYWORD);
1772 if (s && s->op->statement)
1773 return s->op->statement(token, stmt);
1774
1775 if (match_op(token->next, ':')) {
1776 stmt->type = STMT_LABEL;
1777 stmt->label_identifier = label_symbol(token);
1778 token = handle_attributes(token->next->next, &stmt->label_identifier->ctype, KW_ATTRIBUTE);
1779 return statement(token, &stmt->label_statement);
1780 }
1781 }
1782
1783 if (match_op(token, '{')) {
1784 stmt->type = STMT_COMPOUND;
1785 start_symbol_scope();
1786 token = compound_statement(token->next, stmt);
1787 end_symbol_scope();
1788
1789 return expect(token, '}', "at end of compound statement");
1790 }
1791
1792 stmt->type = STMT_EXPRESSION;
1793 return expression_statement(token, &stmt->expression);
1794 }
1795
1796 static struct token * statement_list(struct token *token, struct statement_list **list)
1797 {
1798 int seen_statement = 0;
1799 for (;;) {
1800 struct statement * stmt;
1801 if (eof_token(token))
1802 break;
1803 if (match_op(token, '}'))
1804 break;
1805 if (lookup_type(token)) {
1806 if (seen_statement) {
1807 warning(token->pos, "mixing declarations and code");
1808 seen_statement = 0;
1809 }
1810 stmt = alloc_statement(token->pos, STMT_DECLARATION);
1811 token = external_declaration(token, &stmt->declaration);
1812 } else {
1813 seen_statement = Wdeclarationafterstatement;
1814 token = statement(token, &stmt);
1815 }
1816 add_statement(list, stmt);
1817 }
1818 return token;
1819 }
1820
1821 static struct token *parameter_type_list(struct token *token, struct symbol *fn, struct ident **p)
1822 {
1823 struct symbol_list **list = &fn->arguments;
1824
1825 if (match_op(token, ')')) {
1826 // No warning for "void oink ();"
1827 // Bug or feature: warns for "void oink () __attribute__ ((noreturn));"
1828 if (p && !match_op(token->next, ';'))
1829 warning(token->pos, "non-ANSI function declaration of function '%s'", show_ident(*p));
1830 return token;
1831 }
1832
1833 for (;;) {
1834 struct symbol *sym;
1835
1836 if (match_op(token, SPECIAL_ELLIPSIS)) {
1837 if (!*list)
1838 warning(token->pos, "variadic functions must have one named argument");
1839 fn->variadic = 1;
1840 token = token->next;
1841 break;
1842 }
1843
1844 sym = alloc_symbol(token->pos, SYM_NODE);
1845 token = parameter_declaration(token, &sym);
1846 if (sym->ctype.base_type == &void_ctype) {
1847 /* Special case: (void) */
1848 if (!*list && !sym->ident)
1849 break;
1850 warning(token->pos, "void parameter");
1851 }
1852 add_symbol(list, sym);
1853 sym->endpos = token->pos;
1854 if (!match_op(token, ','))
1855 break;
1856 token = token->next;
1857
1858 }
1859 return token;
1860 }
1861
1862 struct token *compound_statement(struct token *token, struct statement *stmt)
1863 {
1864 token = statement_list(token, &stmt->stmts);
1865 return token;
1866 }
1867
1868 static struct expression *identifier_expression(struct token *token)
1869 {
1870 struct expression *expr = alloc_expression(token->pos, EXPR_IDENTIFIER);
1871 expr->expr_ident = token->ident;
1872 return expr;
1873 }
1874
1875 static struct expression *index_expression(struct expression *from, struct expression *to)
1876 {
1877 int idx_from, idx_to;
1878 struct expression *expr = alloc_expression(from->pos, EXPR_INDEX);
1879
1880 idx_from = const_expression_value(from);
1881 idx_to = idx_from;
1882 if (to) {
1883 idx_to = const_expression_value(to);
1884 if (idx_to < idx_from || idx_from < 0)
1885 warning(from->pos, "nonsense array initializer index range");
1886 }
1887 expr->idx_from = idx_from;
1888 expr->idx_to = idx_to;
1889 return expr;
1890 }
1891
1892 static struct token *single_initializer(struct expression **ep, struct token *token)
1893 {
1894 int expect_equal = 0;
1895 struct token *next = token->next;
1896 struct expression **tail = ep;
1897 int nested;
1898
1899 *ep = NULL;
1900
1901 if ((token_type(token) == TOKEN_IDENT) && match_op(next, ':')) {
1902 struct expression *expr = identifier_expression(token);
1903 if (Wold_initializer)
1904 warning(token->pos, "obsolete struct initializer, use C99 syntax");
1905 token = initializer(&expr->ident_expression, next->next);
1906 if (expr->ident_expression)
1907 *ep = expr;
1908 return token;
1909 }
1910
1911 for (tail = ep, nested = 0; ; nested++, next = token->next) {
1912 if (match_op(token, '.') && (token_type(next) == TOKEN_IDENT)) {
1913 struct expression *expr = identifier_expression(next);
1914 *tail = expr;
1915 tail = &expr->ident_expression;
1916 expect_equal = 1;
1917 token = next->next;
1918 } else if (match_op(token, '[')) {
1919 struct expression *from = NULL, *to = NULL, *expr;
1920 token = constant_expression(token->next, &from);
1921 if (!from) {
1922 sparse_error(token->pos, "Expected constant expression");
1923 break;
1924 }
1925 if (match_op(token, SPECIAL_ELLIPSIS))
1926 token = constant_expression(token->next, &to);
1927 expr = index_expression(from, to);
1928 *tail = expr;
1929 tail = &expr->idx_expression;
1930 token = expect(token, ']', "at end of initializer index");
1931 if (nested)
1932 expect_equal = 1;
1933 } else {
1934 break;
1935 }
1936 }
1937 if (nested && !expect_equal) {
1938 if (!match_op(token, '='))
1939 warning(token->pos, "obsolete array initializer, use C99 syntax");
1940 else
1941 expect_equal = 1;
1942 }
1943 if (expect_equal)
1944 token = expect(token, '=', "at end of initializer index");
1945
1946 token = initializer(tail, token);
1947 if (!*tail)
1948 *ep = NULL;
1949 return token;
1950 }
1951
1952 static struct token *initializer_list(struct expression_list **list, struct token *token)
1953 {
1954 struct expression *expr;
1955
1956 for (;;) {
1957 token = single_initializer(&expr, token);
1958 if (!expr)
1959 break;
1960 add_expression(list, expr);
1961 if (!match_op(token, ','))
1962 break;
1963 token = token->next;
1964 }
1965 return token;
1966 }
1967
1968 struct token *initializer(struct expression **tree, struct token *token)
1969 {
1970 if (match_op(token, '{')) {
1971 struct expression *expr = alloc_expression(token->pos, EXPR_INITIALIZER);
1972 *tree = expr;
1973 token = initializer_list(&expr->expr_list, token->next);
1974 return expect(token, '}', "at end of initializer");
1975 }
1976 return assignment_expression(token, tree);
1977 }
1978
1979 static void declare_argument(struct symbol *sym, struct symbol *fn)
1980 {
1981 if (!sym->ident) {
1982 sparse_error(sym->pos, "no identifier for function argument");
1983 return;
1984 }
1985 bind_symbol(sym, sym->ident, NS_SYMBOL);
1986 }
1987
1988 static struct token *parse_function_body(struct token *token, struct symbol *decl,
1989 struct symbol_list **list)
1990 {
1991 struct symbol_list **old_symbol_list;
1992 struct symbol *base_type = decl->ctype.base_type;
1993 struct statement *stmt, **p;
1994 struct symbol *prev;
1995 struct symbol *arg;
1996
1997 old_symbol_list = function_symbol_list;
1998 if (decl->ctype.modifiers & MOD_INLINE) {
1999 function_symbol_list = &decl->inline_symbol_list;
2000 p = &base_type->inline_stmt;
2001 } else {
2002 function_symbol_list = &decl->symbol_list;
2003 p = &base_type->stmt;
2004 }
2005 function_computed_target_list = NULL;
2006 function_computed_goto_list = NULL;
2007
2008 if (decl->ctype.modifiers & MOD_EXTERN) {
2009 if (!(decl->ctype.modifiers & MOD_INLINE))
2010 warning(decl->pos, "function '%s' with external linkage has definition", show_ident(decl->ident));
2011 }
2012 if (!(decl->ctype.modifiers & MOD_STATIC))
2013 decl->ctype.modifiers |= MOD_EXTERN;
2014
2015 stmt = start_function(decl);
2016
2017 *p = stmt;
2018 FOR_EACH_PTR (base_type->arguments, arg) {
2019 declare_argument(arg, base_type);
2020 } END_FOR_EACH_PTR(arg);
2021
2022 token = compound_statement(token->next, stmt);
2023
2024 end_function(decl);
2025 if (!(decl->ctype.modifiers & MOD_INLINE))
2026 add_symbol(list, decl);
2027 check_declaration(decl);
2028 decl->definition = decl;
2029 prev = decl->same_symbol;
2030 if (prev && prev->definition) {
2031 warning(decl->pos, "multiple definitions for function '%s'",
2032 show_ident(decl->ident));
2033 info(prev->definition->pos, " the previous one is here");
2034 } else {
2035 while (prev) {
2036 prev->definition = decl;
2037 prev = prev->same_symbol;
2038 }
2039 }
2040 function_symbol_list = old_symbol_list;
2041 if (function_computed_goto_list) {
2042 if (!function_computed_target_list)
2043 warning(decl->pos, "function '%s' has computed goto but no targets?", show_ident(decl->ident));
2044 else {
2045 FOR_EACH_PTR(function_computed_goto_list, stmt) {
2046 stmt->target_list = function_computed_target_list;
2047 } END_FOR_EACH_PTR(stmt);
2048 }
2049 }
2050 return expect(token, '}', "at end of function");
2051 }
2052
2053 static void promote_k_r_types(struct symbol *arg)
2054 {
2055 struct symbol *base = arg->ctype.base_type;
2056 if (base && base->ctype.base_type == &int_type && (base->ctype.modifiers & (MOD_CHAR | MOD_SHORT))) {
2057 arg->ctype.base_type = &int_ctype;
2058 }
2059 }
2060
2061 static void apply_k_r_types(struct symbol_list *argtypes, struct symbol *fn)
2062 {
2063 struct symbol_list *real_args = fn->ctype.base_type->arguments;
2064 struct symbol *arg;
2065
2066 FOR_EACH_PTR(real_args, arg) {
2067 struct symbol *type;
2068
2069 /* This is quadratic in the number of arguments. We _really_ don't care */
2070 FOR_EACH_PTR(argtypes, type) {
2071 if (type->ident == arg->ident)
2072 goto match;
2073 } END_FOR_EACH_PTR(type);
2074 sparse_error(arg->pos, "missing type declaration for parameter '%s'", show_ident(arg->ident));
2075 continue;
2076 match:
2077 type->used = 1;
2078 /* "char" and "short" promote to "int" */
2079 promote_k_r_types(type);
2080
2081 arg->ctype = type->ctype;
2082 } END_FOR_EACH_PTR(arg);
2083
2084 FOR_EACH_PTR(argtypes, arg) {
2085 if (!arg->used)
2086 warning(arg->pos, "nonsensical parameter declaration '%s'", show_ident(arg->ident));
2087 } END_FOR_EACH_PTR(arg);
2088
2089 }
2090
2091 static struct token *parse_k_r_arguments(struct token *token, struct symbol *decl,
2092 struct symbol_list **list)
2093 {
2094 struct symbol_list *args = NULL;
2095
2096 warning(token->pos, "non-ANSI definition of function '%s'", show_ident(decl->ident));
2097 do {
2098 token = declaration_list(token, &args);
2099 if (!match_op(token, ';')) {
2100 sparse_error(token->pos, "expected ';' at end of parameter declaration");
2101 break;
2102 }
2103 token = token->next;
2104 } while (lookup_type(token));
2105
2106 apply_k_r_types(args, decl);
2107
2108 if (!match_op(token, '{')) {
2109 sparse_error(token->pos, "expected function body");
2110 return token;
2111 }
2112 return parse_function_body(token, decl, list);
2113 }
2114
2115 static struct token *toplevel_asm_declaration(struct token *token, struct symbol_list **list)
2116 {
2117 struct symbol *anon = alloc_symbol(token->pos, SYM_NODE);
2118 struct symbol *fn = alloc_symbol(token->pos, SYM_FN);
2119 struct statement *stmt;
2120
2121 anon->ctype.base_type = fn;
2122 stmt = alloc_statement(token->pos, STMT_NONE);
2123 fn->stmt = stmt;
2124
2125 token = parse_asm_statement(token, stmt);
2126
2127 add_symbol(list, anon);
2128 return token;
2129 }
2130
2131 struct token *external_declaration(struct token *token, struct symbol_list **list)
2132 {
2133 struct ident *ident = NULL;
2134 struct symbol *decl;
2135 struct ctype ctype = { 0, };
2136 struct symbol *base_type;
2137 int is_typedef;
2138
2139 /* Top-level inline asm? */
2140 if (token_type(token) == TOKEN_IDENT) {
2141 struct symbol *s = lookup_keyword(token->ident, NS_KEYWORD);
2142 if (s && s->op->toplevel)
2143 return s->op->toplevel(token, list);
2144 }
2145
2146 /* Parse declaration-specifiers, if any */
2147 token = declaration_specifiers(token, &ctype, 0);
2148 decl = alloc_symbol(token->pos, SYM_NODE);
2149 decl->ctype = ctype;
2150 token = declarator(token, decl, &ident);
2151 apply_modifiers(token->pos, &decl->ctype);
2152
2153 decl->endpos = token->pos;
2154
2155 /* Just a type declaration? */
2156 if (!ident)
2157 return expect(token, ';', "end of type declaration");
2158
2159 /* type define declaration? */
2160 is_typedef = (ctype.modifiers & MOD_TYPEDEF) != 0;
2161
2162 /* Typedefs don't have meaningful storage */
2163 if (is_typedef) {
2164 ctype.modifiers &= ~MOD_STORAGE;
2165 decl->ctype.modifiers &= ~MOD_STORAGE;
2166 decl->ctype.modifiers |= MOD_USERTYPE;
2167 }
2168
2169 bind_symbol(decl, ident, is_typedef ? NS_TYPEDEF: NS_SYMBOL);
2170
2171 base_type = decl->ctype.base_type;
2172
2173 if (is_typedef) {
2174 if (base_type && !base_type->ident) {
2175 switch (base_type->type) {
2176 case SYM_STRUCT:
2177 case SYM_UNION:
2178 case SYM_ENUM:
2179 case SYM_RESTRICT:
2180 base_type->ident = ident;
2181 }
2182 }
2183 } else if (base_type && base_type->type == SYM_FN) {
2184 /* K&R argument declaration? */
2185 if (lookup_type(token))
2186 return parse_k_r_arguments(token, decl, list);
2187 if (match_op(token, '{'))
2188 return parse_function_body(token, decl, list);
2189
2190 if (!(decl->ctype.modifiers & MOD_STATIC))
2191 decl->ctype.modifiers |= MOD_EXTERN;
2192 } else if (base_type == &void_ctype && !(decl->ctype.modifiers & MOD_EXTERN)) {
2193 sparse_error(token->pos, "void declaration");
2194 }
2195
2196 for (;;) {
2197 if (!is_typedef && match_op(token, '=')) {
2198 if (decl->ctype.modifiers & MOD_EXTERN) {
2199 warning(decl->pos, "symbol with external linkage has initializer");
2200 decl->ctype.modifiers &= ~MOD_EXTERN;
2201 }
2202 token = initializer(&decl->initializer, token->next);
2203 }
2204 if (!is_typedef) {
2205 if (!(decl->ctype.modifiers & (MOD_EXTERN | MOD_INLINE))) {
2206 add_symbol(list, decl);
2207 fn_local_symbol(decl);
2208 }
2209 }
2210 check_declaration(decl);
2211 if (decl->same_symbol)
2212 decl->definition = decl->same_symbol->definition;
2213
2214 if (!match_op(token, ','))
2215 break;
2216
2217 token = token->next;
2218 ident = NULL;
2219 decl = alloc_symbol(token->pos, SYM_NODE);
2220 decl->ctype = ctype;
2221 token = declaration_specifiers(token, &decl->ctype, 1);
2222 token = declarator(token, decl, &ident);
2223 apply_modifiers(token->pos, &decl->ctype);
2224 decl->endpos = token->pos;
2225 if (!ident) {
2226 sparse_error(token->pos, "expected identifier name in type definition");
2227 return token;
2228 }
2229
2230 bind_symbol(decl, ident, is_typedef ? NS_TYPEDEF: NS_SYMBOL);
2231
2232 /* Function declarations are automatically extern unless specifically static */
2233 base_type = decl->ctype.base_type;
2234 if (!is_typedef && base_type && base_type->type == SYM_FN) {
2235 if (!(decl->ctype.modifiers & MOD_STATIC))
2236 decl->ctype.modifiers |= MOD_EXTERN;
2237 }
2238 }
2239 return expect(token, ';', "at end of declaration");
2240 }
Static analysis for C