.ref-BSD-4_3_Net_2/usr/src/usr.bin/pascal/pdx/mappings/functab.c

/*-
 * Copyright (c) 1980 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[] = "@(#)functab.c   5.3 (Berkeley) 4/16/91";
#endif /* not lint */

/*
 * This file contains the implementation of a table for going
 * from object addresses to the functions in which they belong.
 */

#include "defs.h"
#include "mappings.h"
#include "sym.h"

#define MAXNFUNCS 1001          /* maximum number of functions allowed */

LOCAL SYM *functab[MAXNFUNCS];
LOCAL int nfuncs;

/*
 * Insert a new function into the table.
 * The table is ordered by object address.
 */

newfunc(f)
SYM *f;
{
        register int i, j;
        ADDRESS a;

        if (nfuncs >= MAXNFUNCS) {
                panic("too many procedures/functions");
        }
        a = codeloc(f);
        i = 0;
        while (i < nfuncs && codeloc(functab[i]) < a) {
                i++;
        }
        for (j = nfuncs; j > i; j--) {
                functab[j] = functab[j - 1];
        }
        functab[i] = f;
        nfuncs++;
}

/*
 * Return the function that begins at the given address.
 */

SYM *whatblock(addr)
ADDRESS addr;
{
        register int i, j, k;
        ADDRESS a;

        i = 0;
        j = nfuncs - 1;
        if (addr < codeloc(functab[i])) {
                return program;
        } else if (addr == codeloc(functab[i])) {
                return functab[i];
        } else if (addr >= codeloc(functab[j])) {
                return functab[j];
        }
        while (i <= j) {
                k = (i + j) / 2;
                a = codeloc(functab[k]);
                if (a == addr) {
                        return functab[k];
                } else if (addr > a) {
                        i = k+1;
                } else {
                        j = k-1;
                }
        }
        if (addr > codeloc(functab[i])) {
                return functab[i];
        } else {
                return functab[i-1];
        }
        /* NOTREACHED */
}

/*
 * Clear out the functab, used when re-reading the object information.
 */

clrfunctab()
{
        nfuncs = 0;
}