1 /* $NetBSD: init.c,v 1.4 1995/10/02 17:21:37 jpo Exp $ */
4 * Copyright (c) 1994, 1995 Jochen Pohl
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by Jochen Pohl for
19 * 4. The name of the author may not be used to endorse or promote products
20 * derived from this software without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 * $NetBSD: init.c,v 1.4 1995/10/02 17:21:37 jpo Exp $
34 * $DragonFly: src/usr.bin/xlint/lint1/init.c,v 1.6 2004/07/07 12:24:00 asmodai Exp $
42 * initerr is set as soon as a fatal error occured in an initialisation.
43 * The effect is that the rest of the initialisation is ignored (parsed
44 * by yacc, expression trees built, but no initialisation takes place).
48 /* Pointer to the symbol which is to be initialized. */
51 /* Points to the top element of the initialisation stack. */
55 static void popi2(void);
56 static void popinit(int);
57 static void pushinit(void);
58 static void testinit(void);
59 static void nextinit(int);
60 static int strginit(tnode_t *);
64 * Initialize the initialisation stack by putting an entry for the variable
65 * which is to be initialized on it.
75 /* free memory used in last initialisation */
76 while ((istk = initstk) != NULL) {
77 initstk = istk->i_nxt;
82 * If the type which is to be initialized is an incomplete type,
83 * it must be duplicated.
85 if (initsym->s_type->t_tspec == ARRAY && incompl(initsym->s_type))
86 initsym->s_type = duptyp(initsym->s_type);
88 istk = initstk = xcalloc(1, sizeof (istk_t));
89 istk->i_subt = initsym->s_type;
100 initstk = (istk = initstk)->i_nxt;
112 * If the removed element was a structure member, we must go
113 * to the next structure member.
115 if (istk->i_cnt > 0 && istk->i_type->t_tspec == STRUCT) {
117 m = istk->i_mem = istk->i_mem->s_nxt;
120 } while (m->s_field && m->s_name == unnamed);
121 istk->i_subt = m->s_type;
130 * Take all entries, including the first which requires
131 * a closing brace, from the stack.
134 brace = initstk->i_brace;
139 * Take all entries which cannot be used for further
140 * initializers from the stack, but do this only if
141 * they do not require a closing brace.
143 while (!initstk->i_brace &&
144 initstk->i_cnt == 0 && !initstk->i_nolimit) {
159 /* Extend an incomplete array type by one element */
160 if (istk->i_cnt == 0) {
162 * Inside of other aggregate types must not be an incomplete
165 if (istk->i_nxt->i_nxt != NULL)
166 lerror("pushinit() 1");
168 if (istk->i_type->t_tspec != ARRAY)
169 lerror("pushinit() 2");
170 istk->i_type->t_dim++;
171 /* from now its an complete type */
172 setcompl(istk->i_type, 0);
175 if (istk->i_cnt <= 0)
176 lerror("pushinit() 3");
177 if (istk->i_type != NULL && issclt(istk->i_type->t_tspec))
178 lerror("pushinit() 4");
180 initstk = xcalloc(1, sizeof (istk_t));
181 initstk->i_nxt = istk;
182 initstk->i_type = istk->i_subt;
183 if (initstk->i_type->t_tspec == FUNC)
184 lerror("pushinit() 5");
188 switch (istk->i_type->t_tspec) {
190 if (incompl(istk->i_type) && istk->i_nxt->i_nxt != NULL) {
191 /* initialisation of an incomplete type */
196 istk->i_subt = istk->i_type->t_subt;
197 istk->i_nolimit = incompl(istk->i_type);
198 istk->i_cnt = istk->i_type->t_dim;
202 /* initialisation of union is illegal in trad. C */
206 if (incompl(istk->i_type)) {
207 /* initialisation of an incomplete type */
213 for (m = istk->i_type->t_str->memb; m != NULL; m = m->s_nxt) {
214 if (m->s_field && m->s_name == unnamed)
218 istk->i_subt = m->s_type;
222 /* cannot init. struct/union with no named member */
227 istk->i_cnt = istk->i_type->t_tspec == STRUCT ? cnt : 1;
243 * If a closing brace is expected we have at least one initializer
246 if (istk->i_cnt == 0 && !istk->i_nolimit) {
247 switch (istk->i_type->t_tspec) {
249 /* too many array initializers */
254 /* too many struct/union initializers */
258 /* too many initializers */
270 if (initstk->i_type == NULL &&
271 !issclt(initstk->i_subt->t_tspec)) {
272 /* {}-enclosed initializer required */
276 * Make sure an entry with a scalar type is at the top
281 while (!initerr && (initstk->i_type == NULL ||
282 !issclt(initstk->i_type->t_tspec))) {
287 if (initstk->i_type != NULL &&
288 issclt(initstk->i_type->t_tspec)) {
289 /* invalid initializer */
298 initstk->i_brace = 1;
308 if ((initsym->s_scl == AUTO || initsym->s_scl == REG) &&
309 initstk->i_nxt == NULL) {
310 if (tflag && !issclt(initstk->i_subt->t_tspec))
311 /* no automatic aggregate initialization in trad. C*/
316 * Remove all entries which cannot be used for further initializers
317 * and do not expect a closing brace.
343 if (initerr || tn == NULL)
349 * Do not test for automatic aggregat initialisation. If the
350 * initalizer starts with a brace we have the warning already.
351 * If not, an error will be printed that the initializer must
352 * be enclosed by braces.
356 * Local initialisation of non-array-types with only one expression
357 * without braces is done by ASSIGN
359 if ((sc == AUTO || sc == REG) &&
360 initsym->s_type->t_tspec != ARRAY && initstk->i_nxt == NULL) {
361 ln = getnnode(initsym, 0);
362 ln->tn_type = tduptyp(ln->tn_type);
363 ln->tn_type->t_const = 0;
364 tn = build(ASSIGN, ln, tn);
370 * Remove all entries which cannot be used for further initializers
371 * and do not require a closing brace.
375 /* Initialisations by strings are done in strginit(). */
380 if (initerr || tn == NULL)
385 /* Create a temporary node for the left side. */
386 ln = tgetblk(sizeof (tnode_t));
388 ln->tn_type = tduptyp(initstk->i_type);
389 ln->tn_type->t_const = 0;
391 ln->tn_sym = initsym; /* better than nothing */
395 lt = ln->tn_type->t_tspec;
396 rt = tn->tn_type->t_tspec;
399 lerror("mkinit() 1");
401 if (!typeok(INIT, 0, ln, tn))
405 * Store the tree memory. This is nessesary because otherwise
406 * expr() would free it.
412 if (isityp(lt) && ln->tn_type->t_isfield && !isityp(rt)) {
414 * Bit-fields can be initialized in trad. C only by integer
418 /* bit-field initialisation is illegal in trad. C */
422 if (lt != rt || (initstk->i_type->t_isfield && tn->tn_op == CON))
423 tn = convert(INIT, 0, initstk->i_type, tn);
425 if (tn != NULL && tn->tn_op != CON) {
428 if (conaddr(tn, &sym, &offs) == -1) {
429 if (sc == AUTO || sc == REG) {
430 /* non-constant initializer */
433 /* non-constant initializer */
445 strginit(tnode_t *tn)
452 if (tn->tn_op != STRING)
459 * Check if we have an array type which can be initialized by
462 if (istk->i_subt->t_tspec == ARRAY) {
463 t = istk->i_subt->t_subt->t_tspec;
464 if (!((strg->st_tspec == CHAR &&
465 (t == CHAR || t == UCHAR || t == SCHAR)) ||
466 (strg->st_tspec == WCHAR && t == WCHAR))) {
469 /* Put the array at top of stack */
472 } else if (istk->i_type != NULL && istk->i_type->t_tspec == ARRAY) {
473 t = istk->i_type->t_subt->t_tspec;
474 if (!((strg->st_tspec == CHAR &&
475 (t == CHAR || t == UCHAR || t == SCHAR)) ||
476 (strg->st_tspec == WCHAR && t == WCHAR))) {
480 * If the array is already partly initialized, we are
483 if (istk->i_cnt != istk->i_type->t_dim)
489 /* Get length without trailing NUL character. */
492 if (istk->i_nolimit) {
494 istk->i_type->t_dim = len + 1;
495 /* from now complete type */
496 setcompl(istk->i_type, 0);
498 if (istk->i_type->t_dim < len) {
499 /* non-null byte ignored in string initializer */
504 /* In every case the array is initialized completely. */