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.
35 static char rcsid[] = "$NetBSD: init.c,v 1.4 1995/10/02 17:21:37 jpo Exp $";
43 * initerr is set as soon as a fatal error occured in an initialisation.
44 * The effect is that the rest of the initialisation is ignored (parsed
45 * by yacc, expression trees built, but no initialisation takes place).
49 /* Pointer to the symbol which is to be initialized. */
52 /* Points to the top element of the initialisation stack. */
56 static void popi2 __P((void));
57 static void popinit __P((int));
58 static void pushinit __P((void));
59 static void testinit __P((void));
60 static void nextinit __P((int));
61 static int strginit __P((tnode_t *));
65 * Initialize the initialisation stack by putting an entry for the variable
66 * which is to be initialized on it.
76 /* free memory used in last initialisation */
77 while ((istk = initstk) != NULL) {
78 initstk = istk->i_nxt;
83 * If the type which is to be initialized is an incomplete type,
84 * it must be duplicated.
86 if (initsym->s_type->t_tspec == ARRAY && incompl(initsym->s_type))
87 initsym->s_type = duptyp(initsym->s_type);
89 istk = initstk = xcalloc(1, sizeof (istk_t));
90 istk->i_subt = initsym->s_type;
101 initstk = (istk = initstk)->i_nxt;
113 * If the removed element was a structure member, we must go
114 * to the next structure member.
116 if (istk->i_cnt > 0 && istk->i_type->t_tspec == STRUCT) {
118 m = istk->i_mem = istk->i_mem->s_nxt;
121 } while (m->s_field && m->s_name == unnamed);
122 istk->i_subt = m->s_type;
132 * Take all entries, including the first which requires
133 * a closing brace, from the stack.
136 brace = initstk->i_brace;
141 * Take all entries which cannot be used for further
142 * initializers from the stack, but do this only if
143 * they do not require a closing brace.
145 while (!initstk->i_brace &&
146 initstk->i_cnt == 0 && !initstk->i_nolimit) {
161 /* Extend an incomplete array type by one element */
162 if (istk->i_cnt == 0) {
164 * Inside of other aggregate types must not be an incomplete
167 if (istk->i_nxt->i_nxt != NULL)
168 lerror("pushinit() 1");
170 if (istk->i_type->t_tspec != ARRAY)
171 lerror("pushinit() 2");
172 istk->i_type->t_dim++;
173 /* from now its an complete type */
174 setcompl(istk->i_type, 0);
177 if (istk->i_cnt <= 0)
178 lerror("pushinit() 3");
179 if (istk->i_type != NULL && issclt(istk->i_type->t_tspec))
180 lerror("pushinit() 4");
182 initstk = xcalloc(1, sizeof (istk_t));
183 initstk->i_nxt = istk;
184 initstk->i_type = istk->i_subt;
185 if (initstk->i_type->t_tspec == FUNC)
186 lerror("pushinit() 5");
190 switch (istk->i_type->t_tspec) {
192 if (incompl(istk->i_type) && istk->i_nxt->i_nxt != NULL) {
193 /* initialisation of an incomplete type */
198 istk->i_subt = istk->i_type->t_subt;
199 istk->i_nolimit = incompl(istk->i_type);
200 istk->i_cnt = istk->i_type->t_dim;
204 /* initialisation of union is illegal in trad. C */
208 if (incompl(istk->i_type)) {
209 /* initialisation of an incomplete type */
215 for (m = istk->i_type->t_str->memb; m != NULL; m = m->s_nxt) {
216 if (m->s_field && m->s_name == unnamed)
220 istk->i_subt = m->s_type;
224 /* cannot init. struct/union with no named member */
229 istk->i_cnt = istk->i_type->t_tspec == STRUCT ? cnt : 1;
245 * If a closing brace is expected we have at least one initializer
248 if (istk->i_cnt == 0 && !istk->i_nolimit) {
249 switch (istk->i_type->t_tspec) {
251 /* too many array initializers */
256 /* too many struct/union initializers */
260 /* too many initializers */
273 if (initstk->i_type == NULL &&
274 !issclt(initstk->i_subt->t_tspec)) {
275 /* {}-enclosed initializer required */
279 * Make sure an entry with a scalar type is at the top
284 while (!initerr && (initstk->i_type == NULL ||
285 !issclt(initstk->i_type->t_tspec))) {
290 if (initstk->i_type != NULL &&
291 issclt(initstk->i_type->t_tspec)) {
292 /* invalid initializer */
301 initstk->i_brace = 1;
311 if ((initsym->s_scl == AUTO || initsym->s_scl == REG) &&
312 initstk->i_nxt == NULL) {
313 if (tflag && !issclt(initstk->i_subt->t_tspec))
314 /* no automatic aggregate initialization in trad. C*/
319 * Remove all entries which cannot be used for further initializers
320 * and do not expect a closing brace.
347 if (initerr || tn == NULL)
353 * Do not test for automatic aggregat initialisation. If the
354 * initalizer starts with a brace we have the warning already.
355 * If not, an error will be printed that the initializer must
356 * be enclosed by braces.
360 * Local initialisation of non-array-types with only one expression
361 * without braces is done by ASSIGN
363 if ((sc == AUTO || sc == REG) &&
364 initsym->s_type->t_tspec != ARRAY && initstk->i_nxt == NULL) {
365 ln = getnnode(initsym, 0);
366 ln->tn_type = tduptyp(ln->tn_type);
367 ln->tn_type->t_const = 0;
368 tn = build(ASSIGN, ln, tn);
374 * Remove all entries which cannot be used for further initializers
375 * and do not require a closing brace.
379 /* Initialisations by strings are done in strginit(). */
384 if (initerr || tn == NULL)
389 /* Create a temporary node for the left side. */
390 ln = tgetblk(sizeof (tnode_t));
392 ln->tn_type = tduptyp(initstk->i_type);
393 ln->tn_type->t_const = 0;
395 ln->tn_sym = initsym; /* better than nothing */
399 lt = ln->tn_type->t_tspec;
400 rt = tn->tn_type->t_tspec;
403 lerror("mkinit() 1");
405 if (!typeok(INIT, 0, ln, tn))
409 * Store the tree memory. This is nessesary because otherwise
410 * expr() would free it.
416 if (isityp(lt) && ln->tn_type->t_isfield && !isityp(rt)) {
418 * Bit-fields can be initialized in trad. C only by integer
422 /* bit-field initialisation is illegal in trad. C */
426 if (lt != rt || (initstk->i_type->t_isfield && tn->tn_op == CON))
427 tn = convert(INIT, 0, initstk->i_type, tn);
429 if (tn != NULL && tn->tn_op != CON) {
432 if (conaddr(tn, &sym, &offs) == -1) {
433 if (sc == AUTO || sc == REG) {
434 /* non-constant initializer */
437 /* non-constant initializer */
457 if (tn->tn_op != STRING)
464 * Check if we have an array type which can be initialized by
467 if (istk->i_subt->t_tspec == ARRAY) {
468 t = istk->i_subt->t_subt->t_tspec;
469 if (!((strg->st_tspec == CHAR &&
470 (t == CHAR || t == UCHAR || t == SCHAR)) ||
471 (strg->st_tspec == WCHAR && t == WCHAR))) {
474 /* Put the array at top of stack */
477 } else if (istk->i_type != NULL && istk->i_type->t_tspec == ARRAY) {
478 t = istk->i_type->t_subt->t_tspec;
479 if (!((strg->st_tspec == CHAR &&
480 (t == CHAR || t == UCHAR || t == SCHAR)) ||
481 (strg->st_tspec == WCHAR && t == WCHAR))) {
485 * If the array is already partly initialized, we are
488 if (istk->i_cnt != istk->i_type->t_dim)
494 /* Get length without trailing NUL character. */
497 if (istk->i_nolimit) {
499 istk->i_type->t_dim = len + 1;
500 /* from now complete type */
501 setcompl(istk->i_type, 0);
503 if (istk->i_type->t_dim < len) {
504 /* non-null byte ignored in string initializer */
509 /* In every case the array is initialized completely. */