4.4BSD/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("]");
}