660 lines
15 KiB
C
660 lines
15 KiB
C
/* $NetBSD: init.c,v 1.18 2004/06/20 22:20:17 jmc Exp $ */
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/*
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* Copyright (c) 1994, 1995 Jochen Pohl
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* All Rights Reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Jochen Pohl for
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* The NetBSD Project.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#if HAVE_NBTOOL_CONFIG_H
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#include "nbtool_config.h"
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#endif
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#include <sys/cdefs.h>
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#if defined(__RCSID) && !defined(lint)
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__RCSID("$NetBSD: init.c,v 1.18 2004/06/20 22:20:17 jmc Exp $");
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#endif
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include "lint1.h"
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/*
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* initerr is set as soon as a fatal error occurred in an initialisation.
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* The effect is that the rest of the initialisation is ignored (parsed
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* by yacc, expression trees built, but no initialisation takes place).
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*/
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int initerr;
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/* Pointer to the symbol which is to be initialized. */
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sym_t *initsym;
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/* Points to the top element of the initialisation stack. */
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istk_t *initstk;
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typedef struct namlist {
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const char *n_name;
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struct namlist *n_prev;
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struct namlist *n_next;
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} namlist_t;
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/* Points to a c9x named member; */
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namlist_t *namedmem = NULL;
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static void popi2(void);
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static void popinit(int);
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static void pushinit(void);
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static void testinit(void);
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static void nextinit(int);
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static int strginit(tnode_t *);
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static void memberpop(void);
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#ifndef DEBUG
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#define DPRINTF(a)
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#else
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#define DPRINTF(a) printf a
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#endif
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void
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memberpush(sb)
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sbuf_t *sb;
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{
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namlist_t *nam = xcalloc(1, sizeof (namlist_t));
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nam->n_name = sb->sb_name;
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DPRINTF(("memberpush = %s\n", nam->n_name));
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if (namedmem == NULL) {
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nam->n_prev = nam->n_next = nam;
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namedmem = nam;
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} else {
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namedmem->n_prev->n_next = nam;
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nam->n_prev = namedmem->n_prev;
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nam->n_next = namedmem;
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namedmem->n_prev = nam;
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}
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#if 0
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nam->n_next = namedmem;
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namedmem = nam;
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#endif
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}
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static void
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memberpop()
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{
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DPRINTF(("memberpop = %s\n", namedmem->n_name));
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if (namedmem->n_next == namedmem) {
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free(namedmem);
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namedmem = NULL;
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} else {
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namlist_t *nam = namedmem;
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namedmem = namedmem->n_next;
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free(nam);
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}
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#if 0
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namedmem = namedmem->n_next;
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free(nam);
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#endif
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}
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/*
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* Initialize the initialisation stack by putting an entry for the variable
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* which is to be initialized on it.
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*/
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void
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prepinit(void)
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{
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istk_t *istk;
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if (initerr)
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return;
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/* free memory used in last initialisation */
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while ((istk = initstk) != NULL) {
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initstk = istk->i_nxt;
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free(istk);
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}
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/*
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* If the type which is to be initialized is an incomplete type,
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* it must be duplicated.
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*/
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if (initsym->s_type->t_tspec == ARRAY && incompl(initsym->s_type))
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initsym->s_type = duptyp(initsym->s_type);
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istk = initstk = xcalloc(1, sizeof (istk_t));
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istk->i_subt = initsym->s_type;
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istk->i_cnt = 1;
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}
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static void
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popi2(void)
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{
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#ifdef DEBUG
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char buf[64];
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#endif
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istk_t *istk;
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sym_t *m;
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initstk = (istk = initstk)->i_nxt;
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if (initstk == NULL)
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LERROR("popi2()");
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free(istk);
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istk = initstk;
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istk->i_cnt--;
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if (istk->i_cnt < 0)
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LERROR("popi2()");
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DPRINTF(("popi2(): %d %s\n", istk->i_cnt,
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namedmem ? namedmem->n_name : "*null*"));
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if (istk->i_cnt >= 0 && namedmem != NULL) {
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DPRINTF(("popi2(): %d %s %s\n", istk->i_cnt,
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tyname(buf, sizeof(buf), istk->i_type), namedmem->n_name));
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for (m = istk->i_type->t_str->memb; m != NULL; m = m->s_nxt) {
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if (m->s_field && m->s_name == unnamed)
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continue;
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if (strcmp(m->s_name, namedmem->n_name) == 0) {
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istk->i_subt = m->s_type;
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istk->i_cnt++;
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memberpop();
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return;
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}
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}
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error(101, namedmem->n_name);
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memberpop();
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istk->i_namedmem = 1;
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return;
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}
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/*
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* If the removed element was a structure member, we must go
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* to the next structure member.
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*/
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if (istk->i_cnt > 0 && istk->i_type->t_tspec == STRUCT &&
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!istk->i_namedmem) {
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do {
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m = istk->i_mem = istk->i_mem->s_nxt;
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if (m == NULL)
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LERROR("popi2()");
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} while (m->s_field && m->s_name == unnamed);
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istk->i_subt = m->s_type;
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}
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}
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static void
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popinit(int brace)
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{
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DPRINTF(("popinit(%d)\n", brace));
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if (brace) {
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/*
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* Take all entries, including the first which requires
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* a closing brace, from the stack.
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*/
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do {
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brace = initstk->i_brace;
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popi2();
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} while (!brace);
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} else {
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/*
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* Take all entries which cannot be used for further
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* initializers from the stack, but do this only if
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* they do not require a closing brace.
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*/
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while (!initstk->i_brace &&
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initstk->i_cnt == 0 && !initstk->i_nolimit) {
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popi2();
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}
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}
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}
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static void
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pushinit(void)
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{
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#ifdef DEBUG
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char buf[64];
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#endif
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istk_t *istk;
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int cnt;
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sym_t *m;
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istk = initstk;
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/* Extend an incomplete array type by one element */
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if (istk->i_cnt == 0) {
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DPRINTF(("pushinit(extend) %s\n", tyname(buf, sizeof(buf),
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istk->i_type)));
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/*
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* Inside of other aggregate types must not be an incomplete
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* type.
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*/
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if (istk->i_nxt->i_nxt != NULL)
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LERROR("pushinit()");
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istk->i_cnt = 1;
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if (istk->i_type->t_tspec != ARRAY)
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LERROR("pushinit()");
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istk->i_type->t_dim++;
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/* from now its an complete type */
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setcompl(istk->i_type, 0);
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}
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if (istk->i_cnt <= 0)
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LERROR("pushinit()");
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if (istk->i_type != NULL && issclt(istk->i_type->t_tspec))
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LERROR("pushinit()");
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initstk = xcalloc(1, sizeof (istk_t));
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initstk->i_nxt = istk;
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initstk->i_type = istk->i_subt;
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if (initstk->i_type->t_tspec == FUNC)
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LERROR("pushinit()");
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again:
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istk = initstk;
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DPRINTF(("pushinit(%s)\n", tyname(buf, sizeof(buf), istk->i_type)));
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switch (istk->i_type->t_tspec) {
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case ARRAY:
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if (namedmem) {
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DPRINTF(("pushinit ARRAY %s\n", namedmem->n_name));
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free(istk);
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initstk = initstk->i_nxt;
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goto again;
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}
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if (incompl(istk->i_type) && istk->i_nxt->i_nxt != NULL) {
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/* initialisation of an incomplete type */
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error(175);
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initerr = 1;
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return;
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}
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istk->i_subt = istk->i_type->t_subt;
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istk->i_nolimit = incompl(istk->i_type);
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istk->i_cnt = istk->i_type->t_dim;
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DPRINTF(("elements array %s[%d] %s\n",
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tyname(buf, sizeof(buf), istk->i_subt), istk->i_cnt,
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namedmem ? namedmem->n_name : "*none*"));
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break;
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case UNION:
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if (tflag)
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/* initialisation of union is illegal in trad. C */
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warning(238);
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/* FALLTHROUGH */
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case STRUCT:
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if (incompl(istk->i_type)) {
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/* initialisation of an incomplete type */
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error(175);
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initerr = 1;
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return;
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}
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cnt = 0;
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DPRINTF(("2. member lookup %s %s\n",
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tyname(buf, sizeof(buf), istk->i_type),
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namedmem ? namedmem->n_name : "*none*"));
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for (m = istk->i_type->t_str->memb; m != NULL; m = m->s_nxt) {
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if (m->s_field && m->s_name == unnamed)
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continue;
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if (namedmem != NULL) {
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DPRINTF(("pushinit():[member:%s, looking:%s]\n",
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m->s_name, namedmem->n_name));
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if (strcmp(m->s_name, namedmem->n_name) == 0) {
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cnt++;
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break;
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} else
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continue;
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}
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if (++cnt == 1) {
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istk->i_mem = m;
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istk->i_subt = m->s_type;
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}
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}
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if (namedmem != NULL) {
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istk->i_namedmem = 1;
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if (m == NULL) {
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error(101, namedmem->n_name);
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initerr = 1;
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} else {
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istk->i_mem = m;
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istk->i_subt = m->s_type;
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}
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memberpop();
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cnt = istk->i_type->t_tspec == STRUCT ? 2 : 1;
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}
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if (cnt == 0) {
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/* cannot init. struct/union with no named member */
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error(179);
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initerr = 1;
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return;
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}
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istk->i_cnt = istk->i_type->t_tspec == STRUCT ? cnt : 1;
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break;
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default:
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if (namedmem) {
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DPRINTF(("pushinit(): pop\n"));
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free(istk);
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initstk = initstk->i_nxt;
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goto again;
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}
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istk->i_cnt = 1;
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break;
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}
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}
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static void
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testinit(void)
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{
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istk_t *istk;
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istk = initstk;
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/*
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* If a closing brace is expected we have at least one initializer
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* too much.
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*/
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if (istk->i_cnt == 0 && !istk->i_nolimit && !istk->i_namedmem) {
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switch (istk->i_type->t_tspec) {
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case ARRAY:
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/* too many array initializers */
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error(173);
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break;
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case STRUCT:
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case UNION:
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/* too many struct/union initializers */
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error(172);
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break;
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default:
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/* too many initializers */
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error(174);
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break;
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}
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initerr = 1;
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}
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}
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static void
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nextinit(int brace)
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{
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char buf[64];
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DPRINTF(("nextinit(%d)\n", brace));
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if (!brace) {
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if (initstk->i_type == NULL &&
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!issclt(initstk->i_subt->t_tspec)) {
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/* {}-enclosed initializer required */
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error(181);
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}
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/*
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* Make sure an entry with a scalar type is at the top
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* of the stack.
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*/
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if (!initerr)
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testinit();
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while (!initerr && (initstk->i_type == NULL ||
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!issclt(initstk->i_type->t_tspec))) {
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if (!initerr)
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pushinit();
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}
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} else {
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if (initstk->i_type != NULL &&
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issclt(initstk->i_type->t_tspec)) {
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/* invalid initializer */
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error(176, tyname(buf, sizeof(buf), initstk->i_type));
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initerr = 1;
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}
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if (!initerr)
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testinit();
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if (!initerr)
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pushinit();
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if (!initerr)
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initstk->i_brace = 1;
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}
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}
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void
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initlbr(void)
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{
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if (initerr)
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return;
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if ((initsym->s_scl == AUTO || initsym->s_scl == REG) &&
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initstk->i_nxt == NULL) {
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if (tflag && !issclt(initstk->i_subt->t_tspec))
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/* no automatic aggregate initialization in trad. C*/
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warning(188);
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}
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/*
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* Remove all entries which cannot be used for further initializers
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* and do not expect a closing brace.
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*/
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popinit(0);
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nextinit(1);
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}
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void
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initrbr(void)
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{
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if (initerr)
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return;
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popinit(1);
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}
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void
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mkinit(tnode_t *tn)
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{
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ptrdiff_t offs;
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sym_t *sym;
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tspec_t lt, rt;
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tnode_t *ln;
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struct mbl *tmem;
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scl_t sc;
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#ifdef DEBUG
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char buf[64];
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#endif
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DPRINTF(("mkinit(%s)\n", tyname(buf, sizeof(buf), tn->tn_type)));
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if (initerr || tn == NULL)
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goto end;
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sc = initsym->s_scl;
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/*
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* Do not test for automatic aggregate initialisation. If the
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* initializer starts with a brace we have the warning already.
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* If not, an error will be printed that the initializer must
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* be enclosed by braces.
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*/
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/*
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* Local initialisation of non-array-types with only one expression
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* without braces is done by ASSIGN
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*/
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if ((sc == AUTO || sc == REG) &&
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initsym->s_type->t_tspec != ARRAY && initstk->i_nxt == NULL) {
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ln = getnnode(initsym, 0);
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ln->tn_type = tduptyp(ln->tn_type);
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ln->tn_type->t_const = 0;
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tn = build(ASSIGN, ln, tn);
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expr(tn, 0, 0, 1);
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goto end;
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}
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/*
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* Remove all entries which cannot be used for further initializers
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* and do not require a closing brace.
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*/
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popinit(0);
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/* Initialisations by strings are done in strginit(). */
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if (strginit(tn))
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goto end;
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nextinit(0);
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if (initerr || tn == NULL)
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goto end;
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initstk->i_cnt--;
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DPRINTF(("mkinit() cnt=%d tn=%p\n", initstk->i_cnt, tn));
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/* Create a temporary node for the left side. */
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ln = tgetblk(sizeof (tnode_t));
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ln->tn_op = NAME;
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ln->tn_type = tduptyp(initstk->i_type);
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ln->tn_type->t_const = 0;
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ln->tn_lvalue = 1;
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ln->tn_sym = initsym; /* better than nothing */
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tn = cconv(tn);
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lt = ln->tn_type->t_tspec;
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rt = tn->tn_type->t_tspec;
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if (!issclt(lt))
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LERROR("mkinit()");
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|
|
if (!typeok(INIT, 0, ln, tn))
|
|
goto end;
|
|
|
|
/*
|
|
* Store the tree memory. This is nessesary because otherwise
|
|
* expr() would free it.
|
|
*/
|
|
tmem = tsave();
|
|
expr(tn, 1, 0, 1);
|
|
trestor(tmem);
|
|
|
|
if (isityp(lt) && ln->tn_type->t_isfield && !isityp(rt)) {
|
|
/*
|
|
* Bit-fields can be initialized in trad. C only by integer
|
|
* constants.
|
|
*/
|
|
if (tflag)
|
|
/* bit-field initialisation is illegal in trad. C */
|
|
warning(186);
|
|
}
|
|
|
|
if (lt != rt || (initstk->i_type->t_isfield && tn->tn_op == CON))
|
|
tn = convert(INIT, 0, initstk->i_type, tn);
|
|
|
|
if (tn != NULL && tn->tn_op != CON) {
|
|
sym = NULL;
|
|
offs = 0;
|
|
if (conaddr(tn, &sym, &offs) == -1) {
|
|
if (sc == AUTO || sc == REG) {
|
|
/* non-constant initializer */
|
|
(void)gnuism(177);
|
|
} else {
|
|
/* non-constant initializer */
|
|
error(177);
|
|
}
|
|
}
|
|
}
|
|
|
|
end:
|
|
/*
|
|
* We only free the block, if we are not a compound declaration
|
|
* We know that the only symbols that start with a digit are the
|
|
* ones we allocate with mktempsym() for compound declarations
|
|
*/
|
|
if (!isdigit((unsigned char)initsym->s_name[0]))
|
|
tfreeblk();
|
|
}
|
|
|
|
|
|
static int
|
|
strginit(tnode_t *tn)
|
|
{
|
|
tspec_t t;
|
|
istk_t *istk;
|
|
int len;
|
|
strg_t *strg;
|
|
|
|
if (tn->tn_op != STRING)
|
|
return (0);
|
|
|
|
istk = initstk;
|
|
strg = tn->tn_strg;
|
|
|
|
/*
|
|
* Check if we have an array type which can be initialized by
|
|
* the string.
|
|
*/
|
|
if (istk->i_subt != NULL && istk->i_subt->t_tspec == ARRAY) {
|
|
t = istk->i_subt->t_subt->t_tspec;
|
|
if (!((strg->st_tspec == CHAR &&
|
|
(t == CHAR || t == UCHAR || t == SCHAR)) ||
|
|
(strg->st_tspec == WCHAR && t == WCHAR))) {
|
|
return (0);
|
|
}
|
|
/* Put the array at top of stack */
|
|
pushinit();
|
|
istk = initstk;
|
|
} else if (istk->i_type != NULL && istk->i_type->t_tspec == ARRAY) {
|
|
t = istk->i_type->t_subt->t_tspec;
|
|
if (!((strg->st_tspec == CHAR &&
|
|
(t == CHAR || t == UCHAR || t == SCHAR)) ||
|
|
(strg->st_tspec == WCHAR && t == WCHAR))) {
|
|
return (0);
|
|
}
|
|
/*
|
|
* If the array is already partly initialized, we are
|
|
* wrong here.
|
|
*/
|
|
if (istk->i_cnt != istk->i_type->t_dim)
|
|
return (0);
|
|
} else {
|
|
return (0);
|
|
}
|
|
|
|
/* Get length without trailing NUL character. */
|
|
len = strg->st_len;
|
|
|
|
if (istk->i_nolimit) {
|
|
istk->i_nolimit = 0;
|
|
istk->i_type->t_dim = len + 1;
|
|
/* from now complete type */
|
|
setcompl(istk->i_type, 0);
|
|
} else {
|
|
if (istk->i_type->t_dim < len) {
|
|
/* non-null byte ignored in string initializer */
|
|
warning(187);
|
|
}
|
|
}
|
|
|
|
/* In every case the array is initialized completely. */
|
|
istk->i_cnt = 0;
|
|
|
|
return (1);
|
|
}
|