/* $NetBSD: emit2.c,v 1.43 2026/01/11 18:11:38 rillig Exp $ */

/*
 * Copyright (c) 1996 Christopher G. Demetriou.  All Rights Reserved.
 * Copyright (c) 1994, 1995 Jochen Pohl
 * All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Jochen Pohl for
 *      The NetBSD Project.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>
#if defined(__RCSID)
__RCSID("$NetBSD: emit2.c,v 1.43 2026/01/11 18:11:38 rillig Exp $");
#endif

#include "lint2.h"

static void outfiles(void);

/* Write type into the output file. */
static void
outtype(const type_t *tp)
{
        static const char tt[NTSPEC] = "???BCCCSSIILLQQJJDDD?XXXV?TTTPAF";
        static const char ss[NTSPEC] = "???  su u u u u us l?s l ?sue   ";

        while (tp != NULL) {
                tspec_t ts = tp->t_tspec;
                if (ts == INT && tp->t_is_enum)
                        ts = ENUM;
                if (!ch_isupper(tt[ts]))
                        errx(1, "internal error: outtype(%d)", ts);
                if (tp->t_const)
                        outchar('c');
                if (tp->t_volatile)
                        outchar('v');
                if (ss[ts] != ' ')
                        outchar(ss[ts]);
                if (ts == FUNC && tp->t_args != NULL && !tp->t_proto)
                        outchar('f');
                else
                        outchar(tt[ts]);

                if (ts == ARRAY) {
                        outint(tp->t_dim);
                } else if (ts == ENUM || ts == STRUCT || ts == UNION) {
                        if (tp->t_istag) {
                                outint(1);
                                outname(tp->t_tag->h_name);
                        } else if (tp->t_istynam) {
                                outint(2);
                                outname(tp->t_tynam->h_name);
                        } else if (tp->t_isuniqpos) {
                                outint(3);
                                outint(tp->t_uniqpos.p_line);
                                outchar('.');
                                outint(tp->t_uniqpos.p_file);
                                outchar('.');
                                outint(tp->t_uniqpos.p_uniq);
                        } else
                                errx(1, "internal error: outtype");
                } else if (ts == FUNC && tp->t_args != NULL) {
                        int na = 0;
                        for (const type_t **ap = tp->t_args; *ap != NULL; ap++)
                                na++;
                        if (tp->t_vararg)
                                na++;
                        outint(na);
                        for (const type_t **ap = tp->t_args; *ap != NULL; ap++)
                                outtype(*ap);
                        if (tp->t_vararg)
                                outchar('E');
                }
                tp = tp->t_subt;
        }
}

/* Write a definition. */
static void
outdef(const hte_t *hte, const sym_t *sym)
{

        outint(0);              /* line number in C source file */
        outchar('d');           /* definition */
        outint(0);              /* index of file where symbol was defined */
        outchar('.');
        outint(0);              /* line number of definition */

        /* flags */
        if (sym->s_check_only_first_args) {
                outchar('v');
                outint(sym->s_check_num_args);
        }
        if (sym->s_scanflike) {
                outchar('S');
                outint(sym->s_scanflike_arg);
        }
        if (sym->s_printflike) {
                outchar('P');
                outint(sym->s_printflike_arg);
        }
        /* definition or tentative definition */
        outchar(sym->s_def == DEF ? 'd' : 't');
        if (TP(sym->s_type)->t_tspec == FUNC) {
                if (sym->s_function_has_return_value)
                        outchar('r');
                if (sym->s_old_style_function)
                        outchar('o');
        }
        outchar('u');           /* used (no warning if not used) */
        outname(hte->h_name);
        outtype(TP(sym->s_type));
        outchar('\n');
}

/* Write the first definition of a name into the lint library. */
static void
dumpname(const hte_t *hte)
{
        sym_t *sym, *def;

        /* static and undefined symbols are not written */
        if (hte->h_static || !hte->h_def)
                return;

        /*
         * If there is a definition, write it. Otherwise, write a tentative
         * definition. This is necessary because more than one tentative
         * definition is allowed (except with sflag).
         */
        def = NULL;
        for (sym = hte->h_syms; sym != NULL; sym = sym->s_next) {
                if (sym->s_def == DEF) {
                        def = sym;
                        break;
                }
                if (sym->s_def == TDEF && def == NULL)
                        def = sym;
        }
        if (def == NULL)
                errx(1, "internal error: dumpname %s", hte->h_name);

        outdef(hte, def);
}

/* Write a new lint library. */
void
outlib(const char *name)
{

        outopen(name);

        outsrc(name);           /* name of the lint library */

        outint(0);              /* filename index of the lint library */
        outchar('s');
        outstrg(name);
        outchar('\n');

        /* All files referenced by unnamed struct/union/enum declarations. */
        outfiles();

        /* Write all definitions with external linkage. */
        symtab_forall_sorted(dumpname);

        outclose();
}

/* Write out the name of a file referenced by a type. */
struct outflist {
        short           ofl_num;
        struct outflist *ofl_next;
};
static struct outflist *outflist;

int
addoutfile(short num)
{
        struct outflist *ofl, **pofl;
        int i;

        ofl = outflist;
        pofl = &outflist;
        i = 1;                          /* library is 0 */

        while (ofl != NULL) {
                if (ofl->ofl_num == num)
                        break;

                pofl = &ofl->ofl_next;
                ofl = ofl->ofl_next;
                i++;
        }

        if (ofl == NULL) {
                ofl = *pofl = xmalloc(sizeof(**pofl));
                ofl->ofl_num = num;
                ofl->ofl_next = NULL;
        }
        return i;
}

static void
outfiles(void)
{
        struct outflist *ofl;
        int i;

        for (ofl = outflist, i = 1; ofl != NULL; ofl = ofl->ofl_next, i++) {
                outint(i);
                outchar('s');
                outstrg(fnames[ofl->ofl_num]);
                outchar('\n');
        }
}