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Annotation of src/usr.bin/gprof/lookup.c, Revision 1.6

1.6     ! millert     1: /*     $OpenBSD: lookup.c,v 1.5 2002/03/25 16:30:55 danh Exp $ */
1.1       deraadt     2: /*     $NetBSD: lookup.c,v 1.5 1995/04/19 07:16:06 cgd Exp $   */
                      3:
                      4: /*
                      5:  * Copyright (c) 1983, 1993
                      6:  *     The Regents of the University of California.  All rights reserved.
                      7:  *
                      8:  * Redistribution and use in source and binary forms, with or without
                      9:  * modification, are permitted provided that the following conditions
                     10:  * are met:
                     11:  * 1. Redistributions of source code must retain the above copyright
                     12:  *    notice, this list of conditions and the following disclaimer.
                     13:  * 2. Redistributions in binary form must reproduce the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer in the
                     15:  *    documentation and/or other materials provided with the distribution.
1.6     ! millert    16:  * 3. Neither the name of the University nor the names of its contributors
1.1       deraadt    17:  *    may be used to endorse or promote products derived from this software
                     18:  *    without specific prior written permission.
                     19:  *
                     20:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     21:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     22:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     23:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     24:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     25:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     26:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     27:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     28:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     29:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     30:  * SUCH DAMAGE.
                     31:  */
                     32:
                     33: #ifndef lint
                     34: #if 0
                     35: static char sccsid[] = "@(#)lookup.c   8.1 (Berkeley) 6/6/93";
                     36: #else
1.6     ! millert    37: static char rcsid[] = "$OpenBSD: lookup.c,v 1.5 2002/03/25 16:30:55 danh Exp $";
1.1       deraadt    38: #endif
                     39: #endif /* not lint */
                     40:
                     41: #include "gprof.h"
                     42:
                     43:     /*
                     44:      * look up an address in a sorted-by-address namelist
                     45:      *     this deals with misses by mapping them to the next lower
                     46:      *     entry point.
                     47:      */
                     48: nltype *
                     49: nllookup( address )
                     50:     unsigned long      address;
                     51: {
1.4       mpech      52:     long       low;
                     53:     long       middle;
                     54:     long       high;
1.1       deraadt    55: #   ifdef DEBUG
1.4       mpech      56:        int     probes;
1.1       deraadt    57:
                     58:        probes = 0;
1.5       danh       59: #   endif /* DEBUG */
1.1       deraadt    60:     for ( low = 0 , high = nname - 1 ; low != high ; ) {
                     61: #      ifdef DEBUG
                     62:            probes += 1;
1.5       danh       63: #      endif /* DEBUG */
1.1       deraadt    64:        middle = ( high + low ) >> 1;
                     65:        if ( nl[ middle ].value <= address && nl[ middle+1 ].value > address ) {
                     66: #          ifdef DEBUG
                     67:                if ( debug & LOOKUPDEBUG ) {
                     68:                    printf( "[nllookup] %d (%d) probes\n" , probes , nname-1 );
                     69:                }
1.5       danh       70: #          endif /* DEBUG */
1.1       deraadt    71:            return &nl[ middle ];
                     72:        }
                     73:        if ( nl[ middle ].value > address ) {
                     74:            high = middle;
                     75:        } else {
                     76:            low = middle + 1;
                     77:        }
                     78:     }
                     79: #   ifdef DEBUG
1.3       mickey     80:        if ( debug & LOOKUPDEBUG )
                     81:            warnx("[nllookup] (%d) binary search fails", nname - 1);
1.5       danh       82: #   endif /* DEBUG */
1.1       deraadt    83:     return 0;
                     84: }
                     85:
                     86: arctype *
                     87: arclookup( parentp , childp )
                     88:     nltype     *parentp;
                     89:     nltype     *childp;
                     90: {
                     91:     arctype    *arcp;
                     92:
                     93:     if ( parentp == 0 || childp == 0 ) {
1.3       mickey     94:        warnx("[arclookup] parentp == 0 || childp == 0");
1.1       deraadt    95:        return 0;
                     96:     }
                     97: #   ifdef DEBUG
                     98:        if ( debug & LOOKUPDEBUG ) {
                     99:            printf( "[arclookup] parent %s child %s\n" ,
                    100:                    parentp -> name , childp -> name );
                    101:        }
1.5       danh      102: #   endif /* DEBUG */
1.1       deraadt   103:     for ( arcp = parentp -> children ; arcp ; arcp = arcp -> arc_childlist ) {
                    104: #      ifdef DEBUG
                    105:            if ( debug & LOOKUPDEBUG ) {
                    106:                printf( "[arclookup]\t arc_parent %s arc_child %s\n" ,
                    107:                        arcp -> arc_parentp -> name ,
                    108:                        arcp -> arc_childp -> name );
                    109:            }
1.5       danh      110: #      endif /* DEBUG */
1.1       deraadt   111:        if ( arcp -> arc_childp == childp ) {
                    112:            return arcp;
                    113:        }
                    114:     }
                    115:     return 0;
                    116: }