usr/src/usr.bin/pascal/pxp/lval.c

/*-
 * Copyright (c) 1980, 1993
 *      The Regents of the University of California.  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 the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
 */

#ifndef lint
static char sccsid[] = "@(#)lval.c      8.1 (Berkeley) 6/6/93";
#endif /* not lint */

/*
 * pxp - Pascal execution profiler
 *
 * Bill Joy UCB
 * Version 1.2 January 1979
 */

#include "0.h"
#include "tree.h"

/*
 * A "variable"
 */
lvalue(r)
        register int *r;
{
        register *c, *co;

        ppid(r[2]);
        for (c = r[3]; c != NIL; c = c[2]) {
                co = c[1];
                if (co == NIL)
                        continue;
                switch (co[0]) {
                        case T_PTR:
                                ppop("^");
                                continue;
                        case T_ARY:
                                arycod(co[1]);
                                continue;
                        case T_FIELD:
                                ppop(".");
                                ppid(co[1]);
                                continue;
                        case T_ARGL:
                                ppid("{unexpected argument list}");
                                break;
                        default:
                                panic("lval2");
                }
        }
}

/*
 * Subscripting
 */
arycod(el)
        register int *el;
{

        ppbra("[");
        if (el != NIL)
                for (;;) {
                        rvalue(el[1], NIL);
                        el = el[2];
                        if (el == NIL)
                                break;
                        ppsep(", ");
                }
        else
                rvalue(NIL, NIL);
        ppket("]");
}