objaddr.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[] = "@(#)objaddr.c	8.1 (Berkeley) 6/6/93";
#endif /* not lint */

/*
 * Lookup the object address of a given line from the named file.
 *
 * Potentially all files in the file table need to be checked
 * until the line is found since a particular file name may appear
 * more than once in the file table (caused by includes).
 */

#include "defs.h"
#include "mappings.h"
#include "object.h"
#include "source.h"
#include "filetab.h"
#include "linetab.h"

ADDRESS objaddr(line, name)
LINENO line;
char *name;
{
    register FILETAB *ftp;
    register LINENO i, j;
    BOOLEAN foundfile;

    if (nlhdr.nlines == 0) {
	return(-1);
    }
    if (name == NULL) {
	name = cursource;
    }
    foundfile = FALSE;
    for (ftp = &filetab[0]; ftp < &filetab[nlhdr.nfiles]; ftp++) {
	if (streq(ftp->filename, name)) {
	    foundfile = TRUE;
	    i = ftp->lineindex;
	    if (ftp == &filetab[nlhdr.nfiles-1]) {
		j = nlhdr.nlines;
	    } else {
		j = (ftp + 1)->lineindex;
	    }
	    while (i < j) {
		if (linetab[i].line == line) {
		    return linetab[i].addr;
		}
		i++;
	    }
	}
    }
    if (!foundfile) {
	error("unknown source file \"%s\"", name);
    }
    return(-1);
}