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 $
41 * initerr is set as soon as a fatal error occured in an initialisation.
42 * The effect is that the rest of the initialisation is ignored (parsed
43 * by yacc, expression trees built, but no initialisation takes place).
47 /* Pointer to the symbol which is to be initialized. */
50 /* Points to the top element of the initialisation stack. */
54 static void popi2 __P((void));
55 static void popinit __P((int));
56 static void pushinit __P((void));
57 static void testinit __P((void));
58 static void nextinit __P((int));
59 static int strginit __P((tnode_t *));
63 * Initialize the initialisation stack by putting an entry for the variable
64 * which is to be initialized on it.
74 /* free memory used in last initialisation */
75 while ((istk = initstk) != NULL) {
76 initstk = istk->i_nxt;
81 * If the type which is to be initialized is an incomplete type,
82 * it must be duplicated.
84 if (initsym->s_type->t_tspec == ARRAY && incompl(initsym->s_type))
85 initsym->s_type = duptyp(initsym->s_type);
87 istk = initstk = xcalloc(1, sizeof (istk_t));
88 istk->i_subt = initsym->s_type;
99 initstk = (istk = initstk)->i_nxt;
111 * If the removed element was a structure member, we must go
112 * to the next structure member.
114 if (istk->i_cnt > 0 && istk->i_type->t_tspec == STRUCT) {
116 m = istk->i_mem = istk->i_mem->s_nxt;
119 } while (m->s_field && m->s_name == unnamed);
120 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 */
271 if (initstk->i_type == NULL &&
272 !issclt(initstk->i_subt->t_tspec)) {
273 /* {}-enclosed initializer required */
277 * Make sure an entry with a scalar type is at the top
282 while (!initerr && (initstk->i_type == NULL ||
283 !issclt(initstk->i_type->t_tspec))) {
288 if (initstk->i_type != NULL &&
289 issclt(initstk->i_type->t_tspec)) {
290 /* invalid initializer */
299 initstk->i_brace = 1;
309 if ((initsym->s_scl == AUTO || initsym->s_scl == REG) &&
310 initstk->i_nxt == NULL) {
311 if (tflag && !issclt(initstk->i_subt->t_tspec))
312 /* no automatic aggregate initialization in trad. C*/
317 * Remove all entries which cannot be used for further initializers
318 * and do not expect a closing brace.
345 if (initerr || tn == NULL)
351 * Do not test for automatic aggregat initialisation. If the
352 * initalizer starts with a brace we have the warning already.
353 * If not, an error will be printed that the initializer must
354 * be enclosed by braces.
358 * Local initialisation of non-array-types with only one expression
359 * without braces is done by ASSIGN
361 if ((sc == AUTO || sc == REG) &&
362 initsym->s_type->t_tspec != ARRAY && initstk->i_nxt == NULL) {
363 ln = getnnode(initsym, 0);
364 ln->tn_type = tduptyp(ln->tn_type);
365 ln->tn_type->t_const = 0;
366 tn = build(ASSIGN, ln, tn);
372 * Remove all entries which cannot be used for further initializers
373 * and do not require a closing brace.
377 /* Initialisations by strings are done in strginit(). */
382 if (initerr || tn == NULL)
387 /* Create a temporary node for the left side. */
388 ln = tgetblk(sizeof (tnode_t));
390 ln->tn_type = tduptyp(initstk->i_type);
391 ln->tn_type->t_const = 0;
393 ln->tn_sym = initsym; /* better than nothing */
397 lt = ln->tn_type->t_tspec;
398 rt = tn->tn_type->t_tspec;
401 lerror("mkinit() 1");
403 if (!typeok(INIT, 0, ln, tn))
407 * Store the tree memory. This is nessesary because otherwise
408 * expr() would free it.
414 if (isityp(lt) && ln->tn_type->t_isfield && !isityp(rt)) {
416 * Bit-fields can be initialized in trad. C only by integer
420 /* bit-field initialisation is illegal in trad. C */
424 if (lt != rt || (initstk->i_type->t_isfield && tn->tn_op == CON))
425 tn = convert(INIT, 0, initstk->i_type, tn);
427 if (tn != NULL && tn->tn_op != CON) {
430 if (conaddr(tn, &sym, &offs) == -1) {
431 if (sc == AUTO || sc == REG) {
432 /* non-constant initializer */
435 /* non-constant initializer */
455 if (tn->tn_op != STRING)
462 * Check if we have an array type which can be initialized by
465 if (istk->i_subt->t_tspec == ARRAY) {
466 t = istk->i_subt->t_subt->t_tspec;
467 if (!((strg->st_tspec == CHAR &&
468 (t == CHAR || t == UCHAR || t == SCHAR)) ||
469 (strg->st_tspec == WCHAR && t == WCHAR))) {
472 /* Put the array at top of stack */
475 } else if (istk->i_type != NULL && istk->i_type->t_tspec == ARRAY) {
476 t = istk->i_type->t_subt->t_tspec;
477 if (!((strg->st_tspec == CHAR &&
478 (t == CHAR || t == UCHAR || t == SCHAR)) ||
479 (strg->st_tspec == WCHAR && t == WCHAR))) {
483 * If the array is already partly initialized, we are
486 if (istk->i_cnt != istk->i_type->t_dim)
492 /* Get length without trailing NUL character. */
495 if (istk->i_nolimit) {
497 istk->i_type->t_dim = len + 1;
498 /* from now complete type */
499 setcompl(istk->i_type, 0);
501 if (istk->i_type->t_dim < len) {
502 /* non-null byte ignored in string initializer */
507 /* In every case the array is initialized completely. */