const.c

早期freebsd实现

/*-
 * 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[] = "@(#)const.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"

STATIC	int constcnt = -1;

/*
 * The const declaration part
 */
constbeg(l, cline)
	int l, cline;
{

	line = l;
	if (nodecl)
		printoff();
	puthedr();
	putcm();
	ppnl();
	indent();
	ppkw("const");
	ppgoin(DECL);
	constcnt = 0;
	setline(cline);
}

constant(cline, cid, cdecl)
	int cline;
	char *cid;
	int *cdecl;
{

	if (constcnt)
		putcm();
	setline(cline);
	ppitem();
	ppid(cid);
	ppsep(" = ");
	gconst(cdecl);
	ppsep(";");
	constcnt++;
	setinfo(cline);
	putcml();
}

constend()
{

	if (constcnt == -1)
		return;
	if (nodecl)
		return;
	if (constcnt == 0)
		ppid("{const decls}");
	ppgoout(DECL);
	constcnt = -1;
}

/*
 * A constant in an expression
 * or a declaration.
 */
gconst(r)
	int *r;
{
	register *cn;

	cn = r;
loop:
	if (cn == NIL) {
		ppid("{constant}");
		return;
	}
	switch (cn[0]) {
		default:
			panic("gconst");
		case T_PLUSC:
			ppop("+");
			cn = cn[1];
			goto loop;
		case T_MINUSC:
			ppop("-");
			cn = cn[1];
			goto loop;
		case T_ID:
			ppid(cn[1]);
			return;
		case T_CBINT:
		case T_CINT:
		case T_CFINT:
			ppnumb(cn[1]);
			if (cn[0] == T_CBINT)
				ppsep("b");
			return;
		case T_CSTRNG:
			ppstr(cn[1]);
			return;
	}
}