| blob | 132241edf63887a22827013977926aeb1b819361 |
1 #include "c.h"
4 #define add(x,n) (x > inttype->u.sym->u.limits.max.i-(n) ? (overflow=1,x) : x+(n))
5 #define chkoverflow(x,n) ((void)add(x,n))
6 #define bits2bytes(n) (((n) + 7)/8)
7 static int regcount;
9 static List autos, registers;
10 Symbol cfunc; /* current function */
11 Symbol retv; /* return value location for structs */
13 static void checkref(Symbol, void *);
14 static Symbol dclglobal(int, char *, Type, Coordinate *);
15 static Symbol dcllocal(int, char *, Type, Coordinate *);
16 static Symbol dclparam(int, char *, Type, Coordinate *);
17 static Type dclr(Type, char **, Symbol **, int);
18 static Type dclr1(char **, Symbol **, int);
19 static void decl(Symbol (*)(int, char *, Type, Coordinate *));
20 extern void doconst(Symbol, void *);
21 static void doglobal(Symbol, void *);
22 static void doextern(Symbol, void *);
23 static void exitparams(Symbol []);
24 static void fields(Type);
25 static void funcdefn(int, char *, Type, Symbol [], Coordinate);
26 static void initglobal(Symbol, int);
27 static void oldparam(Symbol, void *);
28 static Symbol *parameters(Type);
29 static Type specifier(int *);
30 static Type structdcl(int);
31 static Type tnode(int, Type);
32 void program(void) {
33 int n;
35 level = GLOBAL;
36 for (n = 0; t != EOI; n++)
37 if (kind[t] == CHAR || kind[t] == STATIC
38 || t == ID || t == '*' || t == '(') {
39 decl(dclglobal);
40 deallocate(STMT);
41 if (!(glevel >= 3 || xref))
42 deallocate(FUNC);
43 } else if (t == ';') {
44 warning("empty declaration\n");
45 t = gettok();
46 } else {
47 error("unrecognized declaration\n");
48 t = gettok();
49 }
50 if (n == 0)
51 warning("empty input file\n");
52 }
53 static Type specifier(int *sclass) {
54 int cls, cons, sign, size, type, vol;
55 Type ty = NULL;
57 cls = vol = cons = sign = size = type = 0;
58 if (sclass == NULL)
59 cls = AUTO;
60 for (;;) {
61 int *p, tt = t;
62 switch (t) {
63 case AUTO:
64 case REGISTER: if (level <= GLOBAL && cls == 0)
65 error("invalid use of `%k'\n", t);
66 p = &cls; t = gettok(); break;
67 case STATIC: case EXTERN:
68 case TYPEDEF: p = &cls; t = gettok(); break;
69 case CONST: p = &cons; t = gettok(); break;
70 case VOLATILE: p = &vol; t = gettok(); break;
71 case SIGNED:
72 case UNSIGNED: p = &sign; t = gettok(); break;
73 case LONG: if (size == LONG) {
74 size = 0;
75 tt = LONG+LONG;
76 }
77 p = &size; t = gettok(); break;
78 case SHORT: p = &size; t = gettok(); break;
79 case VOID: case CHAR: case INT: case FLOAT:
80 case DOUBLE: p = &type; ty = tsym->type;
81 t = gettok(); break;
82 case ENUM: p = &type; ty = enumdcl(); break;
83 case STRUCT:
84 case UNION: p = &type; ty = structdcl(t); break;
85 case ID:
86 if (istypename(t, tsym) && type == 0
87 && sign == 0 && size == 0) {
88 use(tsym, src);
89 ty = tsym->type;
90 if (isqual(ty)
91 && ty->size != ty->type->size) {
92 ty = unqual(ty);
93 if (isconst(tsym->type))
94 ty = qual(CONST, ty);
95 if (isvolatile(tsym->type))
96 ty = qual(VOLATILE, ty);
97 tsym->type = ty;
98 }
99 p = &type;
100 t = gettok();
101 } else
102 p = NULL;
103 break;
104 default: p = NULL;
105 }
106 if (p == NULL)
107 break;
108 if (*p)
109 error("invalid use of `%k'\n", tt);
110 *p = tt;
111 }
112 if (sclass)
113 *sclass = cls;
114 if (type == 0) {
115 type = INT;
116 ty = inttype;
117 }
118 if ((size == SHORT && type != INT)
119 || (size == LONG+LONG && type != INT)
120 || (size == LONG && type != INT && type != DOUBLE)
121 || (sign && type != INT && type != CHAR))
122 error("invalid type specification\n");
123 if (type == CHAR && sign)
124 ty = sign == UNSIGNED ? unsignedchar : signedchar;
125 else if (size == SHORT)
126 ty = sign == UNSIGNED ? unsignedshort : shorttype;
127 else if (size == LONG && type == DOUBLE)
128 ty = longdouble;
129 else if (size == LONG+LONG) {
130 ty = sign == UNSIGNED ? unsignedlonglong : longlong;
131 if (Aflag >= 1)
132 warning("`%t' is a non-ANSI type\n", ty);
133 } else if (size == LONG)
134 ty = sign == UNSIGNED ? unsignedlong : longtype;
135 else if (sign == UNSIGNED && type == INT)
136 ty = unsignedtype;
137 if (cons == CONST)
138 ty = qual(CONST, ty);
139 if (vol == VOLATILE)
140 ty = qual(VOLATILE, ty);
141 return ty;
142 }
143 static void decl(Symbol (*dcl)(int, char *, Type, Coordinate *)) {
144 int sclass;
145 Type ty, ty1;
146 static char stop[] = { CHAR, STATIC, ID, 0 };
148 ty = specifier(&sclass);
149 if (t == ID || t == '*' || t == '(' || t == '[') {
150 char *id;
151 Coordinate pos;
152 id = NULL;
153 pos = src;
154 if (level == GLOBAL) {
155 Symbol *params = NULL;
156 ty1 = dclr(ty, &id, ¶ms, 0);
157 if (params && id && isfunc(ty1)
158 && (t == '{' || istypename(t, tsym)
159 || (kind[t] == STATIC && t != TYPEDEF))) {
160 if (sclass == TYPEDEF) {
161 error("invalid use of `typedef'\n");
162 sclass = EXTERN;
163 }
164 if (ty1->u.f.oldstyle)
165 exitscope();
166 funcdefn(sclass, id, ty1, params, pos);
167 return;
168 } else if (params)
169 exitparams(params);
170 } else
171 ty1 = dclr(ty, &id, NULL, 0);
172 for (;;) {
173 if (Aflag >= 1 && !hasproto(ty1))
174 warning("missing prototype\n");
175 if (id == NULL)
176 error("missing identifier\n");
177 else if (sclass == TYPEDEF)
178 {
179 Symbol p = lookup(id, identifiers);
180 if (p && p->scope == level)
181 error("redeclaration of `%s'\n", id);
182 p = install(id, &identifiers, level,
183 level < LOCAL ? PERM : FUNC);
184 p->type = ty1;
185 p->sclass = TYPEDEF;
186 p->src = pos;
187 }
188 else
189 (void)(*dcl)(sclass, id, ty1, &pos);
190 if (t != ',')
191 break;
192 t = gettok();
193 id = NULL;
194 pos = src;
195 ty1 = dclr(ty, &id, NULL, 0);
196 }
197 } else if (ty == NULL
198 || !(isenum(ty) ||
199 (isstruct(ty) && (*unqual(ty)->u.sym->name < '1' || *unqual(ty)->u.sym->name > '9'))))
200 error("empty declaration\n");
201 test(';', stop);
202 }
203 static Symbol dclglobal(int sclass, char *id, Type ty, Coordinate *pos) {
204 Symbol p;
206 if (sclass == 0)
207 sclass = AUTO;
208 else if (sclass != EXTERN && sclass != STATIC) {
209 error("invalid storage class `%k' for `%t %s'\n",
210 sclass, ty, id);
211 sclass = AUTO;
212 }
213 p = lookup(id, identifiers);
214 if (p && p->scope == GLOBAL) {
215 if (p->sclass != TYPEDEF && eqtype(ty, p->type, 1))
216 ty = compose(ty, p->type);
217 else
218 error("redeclaration of `%s' previously declared at %w\n", p->name, &p->src);
220 if (!isfunc(ty) && p->defined && t == '=')
221 error("redefinition of `%s' previously defined at %w\n", p->name, &p->src);
223 if ((p->sclass == EXTERN && sclass == STATIC)
224 || (p->sclass == STATIC && sclass == AUTO)
225 || (p->sclass == AUTO && sclass == STATIC))
226 warning("inconsistent linkage for `%s' previously declared at %w\n", p->name, &p->src);
228 }
229 if (p == NULL || p->scope != GLOBAL) {
230 Symbol q = lookup(id, externals);
231 if (q) {
232 if (sclass == STATIC || !eqtype(ty, q->type, 1))
233 warning("declaration of `%s' does not match previous declaration at %w\n", id, &q->src);
235 p = relocate(id, externals, globals);
236 p->sclass = sclass;
237 } else {
238 p = install(id, &globals, GLOBAL, PERM);
239 p->sclass = sclass;
240 (*IR->defsymbol)(p);
241 }
242 if (p->sclass != STATIC) {
243 static int nglobals;
244 nglobals++;
245 if (Aflag >= 2 && nglobals == 512)
246 warning("more than 511 external identifiers\n");
247 }
248 } else if (p->sclass == EXTERN)
249 p->sclass = sclass;
250 p->type = ty;
251 p->src = *pos;
252 if (t == '=' && isfunc(p->type)) {
253 error("illegal initialization for `%s'\n", p->name);
254 t = gettok();
255 initializer(p->type, 0);
256 } else if (t == '=') {
257 initglobal(p, 0);
258 if (glevel > 0 && IR->stabsym) {
259 (*IR->stabsym)(p); swtoseg(p->u.seg); }
260 } else if (p->sclass == STATIC && !isfunc(p->type)
261 && p->type->size == 0)
262 error("undefined size for `%t %s'\n", p->type, p->name);
263 return p;
264 }
265 static void initglobal(Symbol p, int flag) {
266 Type ty;
268 if (t == '=' || flag) {
269 if (p->sclass == STATIC) {
270 for (ty = p->type; isarray(ty); ty = ty->type)
271 ;
272 defglobal(p, isconst(ty) ? LIT : DATA);
273 } else
274 defglobal(p, DATA);
275 if (t == '=')
276 t = gettok();
277 ty = initializer(p->type, 0);
278 if (isarray(p->type) && p->type->size == 0)
279 p->type = ty;
280 if (p->sclass == EXTERN)
281 p->sclass = AUTO;
282 }
283 }
284 void defglobal(Symbol p, int seg) {
285 p->u.seg = seg;
286 swtoseg(p->u.seg);
287 if (p->sclass != STATIC)
288 (*IR->export)(p);
289 (*IR->global)(p);
290 p->defined = 1;
291 }
293 static Type dclr(Type basety, char **id, Symbol **params, int abstract) {
294 Type ty = dclr1(id, params, abstract);
296 for ( ; ty; ty = ty->type)
297 switch (ty->op) {
298 case POINTER:
299 basety = ptr(basety);
300 break;
301 case FUNCTION:
302 basety = func(basety, ty->u.f.proto,
303 ty->u.f.oldstyle);
304 break;
305 case ARRAY:
306 basety = array(basety, ty->size, 0);
307 break;
308 case CONST: case VOLATILE:
309 basety = qual(ty->op, basety);
310 break;
311 default: assert(0);
312 }
313 if (Aflag >= 2 && basety->size > 32767)
314 warning("more than 32767 bytes in `%t'\n", basety);
315 return basety;
316 }
317 static Type tnode(int op, Type type) {
318 Type ty;
320 NEW0(ty, STMT);
321 ty->op = op;
322 ty->type = type;
323 return ty;
324 }
325 static Type dclr1(char **id, Symbol **params, int abstract) {
326 Type ty = NULL;
328 switch (t) {
329 case ID: if (id)
330 *id = token;
331 else
332 error("extraneous identifier `%s'\n", token);
333 t = gettok(); break;
334 case '*': t = gettok(); if (t == CONST || t == VOLATILE) {
335 Type ty1;
336 ty1 = ty = tnode(t, NULL);
337 while ((t = gettok()) == CONST || t == VOLATILE)
338 ty1 = tnode(t, ty1);
339 ty->type = dclr1(id, params, abstract);
340 ty = ty1;
341 } else
342 ty = dclr1(id, params, abstract);
343 ty = tnode(POINTER, ty); break;
344 case '(': t = gettok(); if (abstract
345 && (t == REGISTER || istypename(t, tsym) || t == ')')) {
346 Symbol *args;
347 ty = tnode(FUNCTION, ty);
348 enterscope();
349 if (level > PARAM)
350 enterscope();
351 args = parameters(ty);
352 exitparams(args);
353 } else {
354 ty = dclr1(id, params, abstract);
355 expect(')');
356 if (abstract && ty == NULL
357 && (id == NULL || *id == NULL))
358 return tnode(FUNCTION, NULL);
359 } break;
360 case '[': break;
361 default: return ty;
362 }
363 while (t == '(' || t == '[')
364 switch (t) {
365 case '(': t = gettok(); { Symbol *args;
366 ty = tnode(FUNCTION, ty);
367 enterscope();
368 if (level > PARAM)
369 enterscope();
370 args = parameters(ty);
371 if (params && *params == NULL)
372 *params = args;
373 else
374 exitparams(args);
375 }
376 break;
377 case '[': t = gettok(); { int n = 0;
378 if (kind[t] == ID) {
379 n = intexpr(']', 1);
380 if (n <= 0) {
381 error("`%d' is an illegal array size\n", n);
382 n = 1;
383 }
384 } else
385 expect(']');
386 ty = tnode(ARRAY, ty);
387 ty->size = n; } break;
388 default: assert(0);
389 }
390 return ty;
391 }
392 static Symbol *parameters(Type fty) {
393 List list = NULL;
394 Symbol *params;
396 if (kind[t] == STATIC || istypename(t, tsym)) {
397 int n = 0;
398 Type ty1 = NULL;
399 for (;;) {
400 Type ty;
401 int sclass = 0;
402 char *id = NULL;
403 if (ty1 && t == ELLIPSIS) {
404 static struct symbol sentinel;
405 if (sentinel.type == NULL) {
406 sentinel.type = voidtype;
407 sentinel.defined = 1;
408 }
409 if (ty1 == voidtype)
410 error("illegal formal parameter types\n");
411 list = append(&sentinel, list);
412 t = gettok();
413 break;
414 }
415 if (!istypename(t, tsym) && t != REGISTER)
416 error("missing parameter type\n");
417 n++;
418 ty = dclr(specifier(&sclass), &id, NULL, 1);
419 if ( (ty == voidtype && (ty1 || id))
420 || ty1 == voidtype)
421 error("illegal formal parameter types\n");
422 if (id == NULL)
423 id = stringd(n);
424 if (ty != voidtype)
425 list = append(dclparam(sclass, id, ty, &src), list);
426 if (Aflag >= 1 && !hasproto(ty))
427 warning("missing prototype\n");
428 if (ty1 == NULL)
429 ty1 = ty;
430 if (t != ',')
431 break;
432 t = gettok();
433 }
434 fty->u.f.proto = newarray(length(list) + 1,
435 sizeof (Type *), PERM);
436 params = ltov(&list, FUNC);
437 for (n = 0; params[n]; n++)
438 fty->u.f.proto[n] = params[n]->type;
439 fty->u.f.proto[n] = NULL;
440 fty->u.f.oldstyle = 0;
441 } else {
442 if (t == ID)
443 for (;;) {
444 Symbol p;
445 if (t != ID) {
446 error("expecting an identifier\n");
447 break;
448 }
449 p = dclparam(0, token, inttype, &src);
450 p->defined = 0;
451 list = append(p, list);
452 t = gettok();
453 if (t != ',')
454 break;
455 t = gettok();
456 }
457 params = ltov(&list, FUNC);
458 fty->u.f.proto = NULL;
459 fty->u.f.oldstyle = 1;
460 }
461 if (t != ')') {
462 static char stop[] = { CHAR, STATIC, IF, ')', 0 };
463 expect(')');
464 skipto('{', stop);
465 }
466 if (t == ')')
467 t = gettok();
468 return params;
469 }
470 static void exitparams(Symbol params[]) {
471 assert(params);
472 if (params[0] && !params[0]->defined)
473 error("extraneous old-style parameter list\n");
474 if (level > PARAM)
475 exitscope();
476 exitscope();
477 }
479 static Symbol dclparam(int sclass, char *id, Type ty, Coordinate *pos) {
480 Symbol p;
482 if (isfunc(ty))
483 ty = ptr(ty);
484 else if (isarray(ty))
485 ty = atop(ty);
486 if (sclass == 0)
487 sclass = AUTO;
488 else if (sclass != REGISTER) {
489 error("invalid storage class `%k' for `%t%s\n",
490 sclass, ty, stringf(id ? " %s'" : "' parameter", id));
491 sclass = AUTO;
492 } else if (isvolatile(ty) || isstruct(ty)) {
493 warning("register declaration ignored for `%t%s\n",
494 ty, stringf(id ? " %s'" : "' parameter", id));
495 sclass = AUTO;
496 }
498 p = lookup(id, identifiers);
499 if (p && p->scope == level)
500 error("duplicate declaration for `%s' previously declared at %w\n", id, &p->src);
502 else
503 p = install(id, &identifiers, level, FUNC);
504 p->sclass = sclass;
505 p->src = *pos;
506 p->type = ty;
507 p->defined = 1;
508 if (t == '=') {
509 error("illegal initialization for parameter `%s'\n", id);
510 t = gettok();
511 (void)expr1(0);
512 }
513 return p;
514 }
515 static Type structdcl(int op) {
516 char *tag;
517 Type ty;
518 Symbol p;
519 Coordinate pos;
521 t = gettok();
522 pos = src;
523 if (t == ID) {
524 tag = token;
525 t = gettok();
526 } else
527 tag = "";
528 if (t == '{') {
529 static char stop[] = { IF, ',', 0 };
530 ty = newstruct(op, tag);
531 ty->u.sym->src = pos;
532 ty->u.sym->defined = 1;
533 t = gettok();
534 if (istypename(t, tsym))
535 fields(ty);
536 else
537 error("invalid %k field declarations\n", op);
538 test('}', stop);
539 }
540 else if (*tag && (p = lookup(tag, types)) != NULL
541 && p->type->op == op) {
542 ty = p->type;
543 if (t == ';' && p->scope < level)
544 ty = newstruct(op, tag);
545 }
546 else {
547 if (*tag == 0)
548 error("missing %k tag\n", op);
549 ty = newstruct(op, tag);
550 }
551 if (*tag && xref)
552 use(ty->u.sym, pos);
553 return ty;
554 }
555 static void fields(Type ty) {
556 { int n = 0;
557 while (istypename(t, tsym)) {
558 static char stop[] = { IF, CHAR, '}', 0 };
559 Type ty1 = specifier(NULL);
560 for (;;) {
561 Field p;
562 char *id = NULL;
563 Type fty = dclr(ty1, &id, NULL, 0);
564 p = newfield(id, ty, fty);
565 if (Aflag >= 1 && !hasproto(p->type))
566 warning("missing prototype\n");
567 if (t == ':') {
568 if (unqual(p->type) != inttype
569 && unqual(p->type) != unsignedtype) {
570 error("`%t' is an illegal bit-field type\n",
571 p->type);
572 p->type = inttype;
573 }
574 t = gettok();
575 p->bitsize = intexpr(0, 0);
576 if (p->bitsize > 8*inttype->size || p->bitsize < 0) {
577 error("`%d' is an illegal bit-field size\n",
578 p->bitsize);
579 p->bitsize = 8*inttype->size;
580 } else if (p->bitsize == 0 && id) {
581 warning("extraneous 0-width bit field `%t %s' ignored\n", p->type, id);
583 p->name = stringd(genlabel(1));
584 }
585 p->lsb = 1;
586 }
587 else {
588 if (id == NULL)
589 error("field name missing\n");
590 else if (isfunc(p->type))
591 error("`%t' is an illegal field type\n", p->type);
592 else if (p->type->size == 0)
593 error("undefined size for field `%t %s'\n",
594 p->type, id);
595 }
596 if (isconst(p->type))
597 ty->u.sym->u.s.cfields = 1;
598 if (isvolatile(p->type))
599 ty->u.sym->u.s.vfields = 1;
600 n++;
601 if (Aflag >= 2 && n == 128)
602 warning("more than 127 fields in `%t'\n", ty);
603 if (t != ',')
604 break;
605 t = gettok();
606 }
607 test(';', stop);
608 } }
609 { int bits = 0, off = 0, overflow = 0;
610 Field p, *q = &ty->u.sym->u.s.flist;
611 ty->align = IR->structmetric.align;
612 for (p = *q; p; p = p->link) {
613 int a = p->type->align ? p->type->align : 1;
614 if (p->lsb)
615 a = unsignedtype->align;
616 if (ty->op == UNION)
617 off = bits = 0;
618 else if (p->bitsize == 0 || bits == 0
619 || bits - 1 + p->bitsize > 8*unsignedtype->size) {
620 off = add(off, bits2bytes(bits-1));
621 bits = 0;
622 chkoverflow(off, a - 1);
623 off = roundup(off, a);
624 }
625 if (a > ty->align)
626 ty->align = a;
627 p->offset = off;
629 if (p->lsb) {
630 if (bits == 0)
631 bits = 1;
632 if (IR->little_endian)
633 p->lsb = bits;
634 else
635 p->lsb = 8*unsignedtype->size - bits + 1
636 - p->bitsize + 1;
637 bits += p->bitsize;
638 } else
639 off = add(off, p->type->size);
640 if (off + bits2bytes(bits-1) > ty->size)
641 ty->size = off + bits2bytes(bits-1);
642 if (p->name == NULL
643 || !('1' <= *p->name && *p->name <= '9')) {
644 *q = p;
645 q = &p->link;
646 }
647 }
648 *q = NULL;
649 chkoverflow(ty->size, ty->align - 1);
650 ty->size = roundup(ty->size, ty->align);
651 if (overflow) {
652 error("size of `%t' exceeds %d bytes\n", ty, inttype->u.sym->u.limits.max.i);
653 ty->size = inttype->u.sym->u.limits.max.i&(~(ty->align - 1));
654 } }
655 }
656 static void funcdefn(int sclass, char *id, Type ty, Symbol params[], Coordinate pt) {
657 int i, n;
658 Symbol *callee, *caller, p;
659 Type rty = freturn(ty);
661 if (isstruct(rty) && rty->size == 0)
662 error("illegal use of incomplete type `%t'\n", rty);
663 for (n = 0; params[n]; n++)
664 ;
665 if (n > 0 && params[n-1]->name == NULL)
666 params[--n] = NULL;
667 if (Aflag >= 2 && n > 31)
668 warning("more than 31 parameters in function `%s'\n", id);
669 if (ty->u.f.oldstyle) {
670 if (Aflag >= 1)
671 warning("old-style function definition for `%s'\n", id);
672 caller = params;
673 callee = newarray(n + 1, sizeof *callee, FUNC);
674 memcpy(callee, caller, (n+1)*sizeof *callee);
675 enterscope();
676 assert(level == PARAM);
677 while (kind[t] == STATIC || istypename(t, tsym))
678 decl(dclparam);
679 foreach(identifiers, PARAM, oldparam, callee);
681 for (i = 0; (p = callee[i]) != NULL; i++) {
682 if (!p->defined)
683 callee[i] = dclparam(0, p->name, inttype, &p->src);
684 *caller[i] = *p;
685 caller[i]->sclass = AUTO;
686 caller[i]->type = promote(p->type);
687 }
688 p = lookup(id, identifiers);
689 if (p && p->scope == GLOBAL && isfunc(p->type)
690 && p->type->u.f.proto) {
691 Type *proto = p->type->u.f.proto;
692 for (i = 0; caller[i] && proto[i]; i++) {
693 Type ty = unqual(proto[i]);
694 if (eqtype(isenum(ty) ? ty->type : ty,
695 unqual(caller[i]->type), 1) == 0)
696 break;
697 else if (isenum(ty) && !isenum(unqual(caller[i]->type)))
698 warning("compatibility of `%t' and `%t' is compiler dependent\n",
699 proto[i], caller[i]->type);
700 }
701 if (proto[i] || caller[i])
702 error("conflicting argument declarations for function `%s'\n", id);
704 }
705 else {
706 Type *proto = newarray(n + 1, sizeof *proto, PERM);
707 if (Aflag >= 1)
708 warning("missing prototype for `%s'\n", id);
709 for (i = 0; i < n; i++)
710 proto[i] = caller[i]->type;
711 proto[i] = NULL;
712 ty = func(rty, proto, 1);
713 }
714 } else {
715 callee = params;
716 caller = newarray(n + 1, sizeof *caller, FUNC);
717 for (i = 0; (p = callee[i]) != NULL && p->name; i++) {
718 NEW(caller[i], FUNC);
719 *caller[i] = *p;
720 if (isint(p->type))
721 caller[i]->type = promote(p->type);
722 caller[i]->sclass = AUTO;
723 if ('1' <= *p->name && *p->name <= '9')
724 error("missing name for parameter %d to function `%s'\n", i + 1, id);
726 }
727 caller[i] = NULL;
728 }
729 for (i = 0; (p = callee[i]) != NULL; i++)
730 if (p->type->size == 0) {
731 error("undefined size for parameter `%t %s'\n",
732 p->type, p->name);
733 caller[i]->type = p->type = inttype;
734 }
735 if (Aflag >= 2 && sclass != STATIC && strcmp(id, "main") == 0) {
736 if (ty->u.f.oldstyle)
737 warning("`%t %s()' is a non-ANSI definition\n", rty, id);
738 else if (!(rty == inttype
739 && ((n == 0 && callee[0] == NULL)
740 || (n == 2 && callee[0]->type == inttype
741 && isptr(callee[1]->type) && callee[1]->type->type == charptype
742 && !variadic(ty)))))
743 warning("`%s' is a non-ANSI definition\n", typestring(ty, id));
744 }
745 p = lookup(id, identifiers);
746 if (p && isfunc(p->type) && p->defined)
747 error("redefinition of `%s' previously defined at %w\n",
748 p->name, &p->src);
749 cfunc = dclglobal(sclass, id, ty, &pt);
750 cfunc->u.f.label = genlabel(1);
751 cfunc->u.f.callee = callee;
752 cfunc->u.f.pt = src;
753 cfunc->defined = 1;
754 if (xref)
755 use(cfunc, cfunc->src);
756 if (Pflag)
757 printproto(cfunc, cfunc->u.f.callee);
758 if (ncalled >= 0)
759 ncalled = findfunc(cfunc->name, pt.file);
760 labels = table(NULL, LABELS);
761 stmtlabs = table(NULL, LABELS);
762 refinc = 1.0;
763 regcount = 0;
764 codelist = &codehead;
765 codelist->next = NULL;
766 if (!IR->wants_callb && isstruct(rty))
767 retv = genident(AUTO, ptr(rty), PARAM);
768 compound(0, NULL, 0);
770 {
771 Code cp;
772 for (cp = codelist; cp->kind < Label; cp = cp->prev)
773 ;
774 if (cp->kind != Jump) {
775 if (rty != voidtype) {
776 warning("missing return value\n");
777 retcode(cnsttree(inttype, 0L));
778 } else
779 retcode(NULL);
780 }
781 }
782 definelab(cfunc->u.f.label);
783 if (events.exit)
784 apply(events.exit, cfunc, NULL);
785 walk(NULL, 0, 0);
786 exitscope();
787 assert(level == PARAM);
788 foreach(identifiers, level, checkref, NULL);
789 if (!IR->wants_callb && isstruct(rty)) {
790 Symbol *a;
791 a = newarray(n + 2, sizeof *a, FUNC);
792 a[0] = retv;
793 memcpy(&a[1], callee, (n+1)*sizeof *callee);
794 callee = a;
795 a = newarray(n + 2, sizeof *a, FUNC);
796 NEW(a[0], FUNC);
797 *a[0] = *retv;
798 memcpy(&a[1], caller, (n+1)*sizeof *callee);
799 caller = a;
800 }
801 if (!IR->wants_argb)
802 for (i = 0; caller[i]; i++)
803 if (isstruct(caller[i]->type)) {
804 caller[i]->type = ptr(caller[i]->type);
805 callee[i]->type = ptr(callee[i]->type);
806 caller[i]->structarg = callee[i]->structarg = 1;
807 }
808 if (glevel > 1) for (i = 0; callee[i]; i++) callee[i]->sclass = AUTO;
809 if (cfunc->sclass != STATIC)
810 (*IR->export)(cfunc);
811 if (glevel && IR->stabsym) {
812 swtoseg(CODE); (*IR->stabsym)(cfunc); }
813 swtoseg(CODE);
814 (*IR->function)(cfunc, caller, callee, cfunc->u.f.ncalls);
815 if (glevel && IR->stabfend)
816 (*IR->stabfend)(cfunc, lineno);
817 foreach(stmtlabs, LABELS, checklab, NULL);
818 exitscope();
819 expect('}');
820 labels = stmtlabs = NULL;
821 retv = NULL;
822 cfunc = NULL;
823 }
824 static void oldparam(Symbol p, void *cl) {
825 int i;
826 Symbol *callee = cl;
828 for (i = 0; callee[i]; i++)
829 if (p->name == callee[i]->name) {
830 callee[i] = p;
831 return;
832 }
833 error("declared parameter `%s' is missing\n", p->name);
834 }
835 void compound(int loop, struct swtch *swp, int lev) {
836 Code cp;
837 int nregs;
839 walk(NULL, 0, 0);
840 cp = code(Blockbeg);
841 enterscope();
842 assert(level >= LOCAL);
843 if (level == LOCAL && events.entry)
844 apply(events.entry, cfunc, NULL);
845 definept(NULL);
846 expect('{');
847 autos = registers = NULL;
848 if (level == LOCAL && IR->wants_callb
849 && isstruct(freturn(cfunc->type))) {
850 retv = genident(AUTO, ptr(freturn(cfunc->type)), level);
851 retv->defined = 1;
852 retv->ref = 1;
853 registers = append(retv, registers);
854 }
855 while (kind[t] == CHAR || kind[t] == STATIC
856 || (istypename(t, tsym) && getchr() != ':'))
857 decl(dcllocal);
858 {
859 int i;
860 Symbol *a = ltov(&autos, STMT);
861 nregs = length(registers);
862 for (i = 0; a[i]; i++)
863 registers = append(a[i], registers);
864 cp->u.block.locals = ltov(®isters, FUNC);
865 }
866 if (events.blockentry)
867 apply(events.blockentry, cp->u.block.locals, NULL);
868 while (kind[t] == IF || kind[t] == ID)
869 statement(loop, swp, lev);
870 walk(NULL, 0, 0);
871 foreach(identifiers, level, checkref, NULL);
872 {
873 int i = nregs, j;
874 Symbol p;
875 for ( ; (p = cp->u.block.locals[i]) != NULL; i++) {
876 for (j = i; j > nregs
877 && cp->u.block.locals[j-1]->ref < p->ref; j--)
878 cp->u.block.locals[j] = cp->u.block.locals[j-1];
879 cp->u.block.locals[j] = p;
880 }
881 }
882 if (events.blockexit)
883 apply(events.blockexit, cp->u.block.locals, NULL);
884 cp->u.block.level = level;
885 cp->u.block.identifiers = identifiers;
886 cp->u.block.types = types;
887 code(Blockend)->u.begin = cp;
888 if (reachable(Gen))
889 definept(NULL);
890 if (level > LOCAL) {
891 exitscope();
892 expect('}');
893 }
894 }
895 static void checkref(Symbol p, void *cl) {
896 if (p->scope >= PARAM
897 && (isvolatile(p->type) || isfunc(p->type)))
898 p->addressed = 1;
899 if (Aflag >= 2 && p->defined && p->ref == 0) {
900 if (p->sclass == STATIC)
901 warning("static `%t %s' is not referenced\n",
902 p->type, p->name);
903 else if (p->scope == PARAM)
904 warning("parameter `%t %s' is not referenced\n",
905 p->type, p->name);
906 else if (p->scope >= LOCAL && p->sclass != EXTERN)
907 warning("local `%t %s' is not referenced\n",
908 p->type, p->name);
909 }
910 if (p->sclass == AUTO
911 && ((p->scope == PARAM && regcount == 0)
912 || p->scope >= LOCAL)
913 && !p->addressed && isscalar(p->type) && p->ref >= 3.0)
914 p->sclass = REGISTER;
915 if (level == GLOBAL && p->sclass == STATIC && !p->defined
916 && isfunc(p->type) && p->ref)
917 error("undefined static `%t %s'\n", p->type, p->name);
918 assert(!(level == GLOBAL && p->sclass == STATIC && !p->defined && !isfunc(p->type)));
919 }
920 static Symbol dcllocal(int sclass, char *id, Type ty, Coordinate *pos) {
921 Symbol p, q;
923 if (sclass == 0)
924 sclass = isfunc(ty) ? EXTERN : AUTO;
925 else if (isfunc(ty) && sclass != EXTERN) {
926 error("invalid storage class `%k' for `%t %s'\n",
927 sclass, ty, id);
928 sclass = EXTERN;
929 } else if (sclass == REGISTER
930 && (isvolatile(ty) || isstruct(ty) || isarray(ty))) {
931 warning("register declaration ignored for `%t %s'\n",
932 ty, id);
933 sclass = AUTO;
934 }
935 q = lookup(id, identifiers);
936 if ((q && q->scope >= level)
937 || (q && q->scope == PARAM && level == LOCAL)) {
938 if (sclass == EXTERN && q->sclass == EXTERN
939 && eqtype(q->type, ty, 1))
940 ty = compose(ty, q->type);
941 else
942 error("redeclaration of `%s' previously declared at %w\n", q->name, &q->src);
943 }
945 assert(level >= LOCAL);
946 p = install(id, &identifiers, level, sclass == STATIC || sclass == EXTERN ? PERM : FUNC);
947 p->type = ty;
948 p->sclass = sclass;
949 p->src = *pos;
950 switch (sclass) {
951 case EXTERN: q = lookup(id, globals);
952 if (q == NULL || q->sclass == TYPEDEF || q->sclass == ENUM) {
953 q = lookup(id, externals);
954 if (q == NULL) {
955 q = install(p->name, &externals, GLOBAL, PERM);
956 q->type = p->type;
957 q->sclass = EXTERN;
958 q->src = src;
959 (*IR->defsymbol)(q);
960 }
961 }
962 if (!eqtype(p->type, q->type, 1))
963 warning("declaration of `%s' does not match previous declaration at %w\n", q->name, &q->src);
965 p->u.alias = q; break;
966 case STATIC: (*IR->defsymbol)(p);
967 initglobal(p, 0);
968 if (!p->defined) {
969 if (p->type->size > 0) {
970 defglobal(p, BSS);
971 (*IR->space)(p->type->size);
972 } else
973 error("undefined size for `%t %s'\n",
974 p->type, p->name);
975 }
976 p->defined = 1; break;
977 case REGISTER: registers = append(p, registers);
978 regcount++;
979 p->defined = 1;
980 break;
981 case AUTO: autos = append(p, autos);
982 p->defined = 1; break;
983 default: assert(0);
984 }
985 if (t == '=') {
986 Tree e;
987 if (sclass == EXTERN)
988 error("illegal initialization of `extern %s'\n", id);
989 t = gettok();
990 definept(NULL);
991 if (isscalar(p->type)
992 || (isstruct(p->type) && t != '{')) {
993 if (t == '{') {
994 t = gettok();
995 e = expr1(0);
996 expect('}');
997 } else
998 e = expr1(0);
999 } else {
1000 Symbol t1;
1001 Type ty = p->type, ty1 = ty;
1002 while (isarray(ty1))
1003 ty1 = ty1->type;
1004 if (!isconst(ty) && (!isarray(ty) || !isconst(ty1)))
1005 ty = qual(CONST, ty);
1006 t1 = genident(STATIC, ty, GLOBAL);
1007 initglobal(t1, 1);
1008 if (isarray(p->type) && p->type->size == 0
1009 && t1->type->size > 0)
1010 p->type = array(p->type->type,
1011 t1->type->size/t1->type->type->size, 0);
1012 e = idtree(t1);
1013 }
1014 walk(root(asgn(p, e)), 0, 0);
1015 p->ref = 1;
1016 }
1017 if (!isfunc(p->type) && p->defined && p->type->size <= 0)
1018 error("undefined size for `%t %s'\n", p->type, id);
1019 return p;
1020 }
1021 void finalize(void) {
1022 foreach(externals, GLOBAL, doextern, NULL);
1023 foreach(identifiers, GLOBAL, doglobal, NULL);
1024 foreach(identifiers, GLOBAL, checkref, NULL);
1025 foreach(constants, CONSTANTS, doconst, NULL);
1026 }
1027 static void doextern(Symbol p, void *cl) {
1028 (*IR->import)(p);
1029 }
1030 static void doglobal(Symbol p, void *cl) {
1031 if (!p->defined && (p->sclass == EXTERN
1032 || (isfunc(p->type) && p->sclass == AUTO)))
1033 (*IR->import)(p);
1034 else if (!p->defined && !isfunc(p->type)
1035 && (p->sclass == AUTO || p->sclass == STATIC)) {
1036 if (isarray(p->type)
1037 && p->type->size == 0 && p->type->type->size > 0)
1038 p->type = array(p->type->type, 1, 0);
1039 if (p->type->size > 0) {
1040 defglobal(p, BSS);
1041 (*IR->space)(p->type->size);
1042 if (glevel > 0 && IR->stabsym)
1043 (*IR->stabsym)(p);
1044 } else
1045 error("undefined size for `%t %s'\n",
1046 p->type, p->name);
1047 p->defined = 1;
1048 }
1049 if (Pflag
1050 && !isfunc(p->type)
1051 && !p->generated && p->sclass != EXTERN)
1052 printdecl(p, p->type);
1053 }
1054 void doconst(Symbol p, void *cl) {
1055 if (p->u.c.loc) {
1056 assert(p->u.c.loc->u.seg == 0);
1057 defglobal(p->u.c.loc, LIT);
1058 if (isarray(p->type) && p->type->type == widechar) {
1059 unsigned int *s = p->u.c.v.p;
1060 int n = p->type->size/widechar->size;
1061 while (n-- > 0) {
1062 Value v;
1063 v.u = *s++;
1064 (*IR->defconst)(widechar->op, widechar->size, v);
1065 }
1066 } else if (isarray(p->type))
1067 (*IR->defstring)(p->type->size, p->u.c.v.p);
1068 else
1069 (*IR->defconst)(p->type->op, p->type->size, p->u.c.v);
1070 p->u.c.loc = NULL;
1071 }
1072 }
1073 void checklab(Symbol p, void *cl) {
1074 if (!p->defined)
1075 error("undefined label `%s'\n", p->name);
1076 p->defined = 1;
1077 }
1079 Type enumdcl(void) {
1080 char *tag;
1081 Type ty;
1082 Symbol p = {0};
1083 Coordinate pos;
1085 t = gettok();
1086 pos = src;
1087 if (t == ID) {
1088 tag = token;
1089 t = gettok();
1090 } else
1091 tag = "";
1092 if (t == '{') {
1093 static char follow[] = { IF, 0 };
1094 int n = 0;
1095 long k = -1;
1096 List idlist = 0;
1097 ty = newstruct(ENUM, tag);
1098 t = gettok();
1099 if (t != ID)
1100 error("expecting an enumerator identifier\n");
1101 while (t == ID) {
1102 char *id = token;
1103 Coordinate s;
1104 if (tsym && tsym->scope == level)
1105 error("redeclaration of `%s' previously declared at %w\n",
1106 token, &tsym->src);
1107 s = src;
1108 t = gettok();
1109 if (t == '=') {
1110 t = gettok();
1111 k = intexpr(0, 0);
1112 } else {
1113 if (k == inttype->u.sym->u.limits.max.i)
1114 error("overflow in value for enumeration constant `%s'\n", id);
1115 k++;
1116 }
1117 p = install(id, &identifiers, level, level < LOCAL ? PERM : FUNC);
1118 p->src = s;
1119 p->type = ty;
1120 p->sclass = ENUM;
1121 p->u.value = k;
1122 idlist = append(p, idlist);
1123 n++;
1124 if (Aflag >= 2 && n == 128)
1125 warning("more than 127 enumeration constants in `%t'\n", ty);
1126 if (t != ',')
1127 break;
1128 t = gettok();
1129 if (Aflag >= 2 && t == '}')
1130 warning("non-ANSI trailing comma in enumerator list\n");
1131 }
1132 test('}', follow);
1133 ty->type = inttype;
1134 ty->size = ty->type->size;
1135 ty->align = ty->type->align;
1136 ty->u.sym->u.idlist = ltov(&idlist, PERM);
1137 ty->u.sym->defined = 1;
1138 } else if ((p = lookup(tag, types)) != NULL && p->type->op == ENUM) {
1139 ty = p->type;
1140 if (t == ';')
1141 error("empty declaration\n");
1142 } else {
1143 error("unknown enumeration `%s'\n", tag);
1144 ty = newstruct(ENUM, tag);
1145 ty->type = inttype;
1146 }
1147 if (*tag && xref)
1148 use(p, pos);
1149 return ty;
1150 }
1152 Type typename(void) {
1153 Type ty = specifier(NULL);
1155 if (t == '*' || t == '(' || t == '[') {
1156 ty = dclr(ty, NULL, NULL, 1);
1157 if (Aflag >= 1 && !hasproto(ty))
1158 warning("missing prototype\n");
1159 }
1160 return ty;
1161 }