freebsd-dev/usr.bin/gprof/lookup.c

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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
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* Copyright (c) 1983, 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. Neither the name of the University nor the names of its contributors
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* 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.
*/
#if 0
#ifndef lint
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static char sccsid[] = "@(#)lookup.c 8.1 (Berkeley) 6/6/93";
#endif /* not lint */
#endif
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#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
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#include "gprof.h"
/*
* look up an address in a sorted-by-address namelist
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* this deals with misses by mapping them to the next lower
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* entry point.
*/
nltype *
nllookup(unsigned long address)
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{
register long low;
register long middle;
register long high;
# ifdef DEBUG
register int probes;
probes = 0;
# endif /* DEBUG */
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for ( low = 0 , high = nname - 1 ; low != high ; ) {
# ifdef DEBUG
probes += 1;
# endif /* DEBUG */
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middle = ( high + low ) >> 1;
if ( nl[ middle ].value <= address && nl[ middle+1 ].value > address ) {
# ifdef DEBUG
if ( debug & LOOKUPDEBUG ) {
printf( "[nllookup] %d (%d) probes\n" , probes , nname-1 );
}
# endif /* DEBUG */
#if defined(__arm__)
if (nl[middle].name[0] == '$' &&
nl[middle-1].value == nl[middle].value)
middle--;
#endif
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return &nl[ middle ];
}
if ( nl[ middle ].value > address ) {
high = middle;
} else {
low = middle + 1;
}
}
# ifdef DEBUG
if ( debug & LOOKUPDEBUG ) {
fprintf( stderr , "[nllookup] (%d) binary search fails\n" ,
nname-1 );
}
# endif /* DEBUG */
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return 0;
}
arctype *
arclookup(nltype *parentp, nltype *childp)
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{
arctype *arcp;
if ( parentp == 0 || childp == 0 ) {
fprintf( stderr, "[arclookup] parentp == 0 || childp == 0\n" );
return 0;
}
# ifdef DEBUG
if ( debug & LOOKUPDEBUG ) {
printf( "[arclookup] parent %s child %s\n" ,
parentp -> name , childp -> name );
}
# endif /* DEBUG */
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for ( arcp = parentp -> children ; arcp ; arcp = arcp -> arc_childlist ) {
# ifdef DEBUG
if ( debug & LOOKUPDEBUG ) {
printf( "[arclookup]\t arc_parent %s arc_child %s\n" ,
arcp -> arc_parentp -> name ,
arcp -> arc_childp -> name );
}
# endif /* DEBUG */
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if ( arcp -> arc_childp == childp ) {
return arcp;
}
}
return 0;
}