usr.bin/gprof/lookup.c

   1 /*
   2  * Copyright (c) 1983, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#)lookup.c 8.1 (Berkeley) 6/6/93
  34  *
  35  * $DragonFly: src/usr.bin/gprof/lookup.c,v 1.5 2006/01/22 03:43:37 swildner Exp $
  36  */
  37
  38 #include "gprof.h"
  39
  40     /*
  41      *  look up an address in a sorted-by-address namelist
  42      *      this deals with misses by mapping them to the next lower
  43      *      entry point.
  44      */
  45 nltype *
  46 nllookup(unsigned long address)
  47 {
  48     long        low;
  49     long        middle;
  50     long        high;
  51 #   ifdef DEBUG
  52         int     probes;
  53
  54         probes = 0;
  55 #   endif /* DEBUG */
  56     for ( low = 0 , high = nname - 1 ; low != high ; ) {
  57 #       ifdef DEBUG
  58             probes += 1;
  59 #       endif /* DEBUG */
  60         middle = ( high + low ) >> 1;
  61         if ( nl[ middle ].value <= address && nl[ middle+1 ].value > address ) {
  62 #           ifdef DEBUG
  63                 if ( debug & LOOKUPDEBUG ) {
  64                     printf( "[nllookup] %d (%d) probes\n" , probes , nname-1 );
  65                 }
  66 #           endif /* DEBUG */
  67             return &nl[ middle ];
  68         }
  69         if ( nl[ middle ].value > address ) {
  70             high = middle;
  71         } else {
  72             low = middle + 1;
  73         }
  74     }
  75 #   ifdef DEBUG
  76         if ( debug & LOOKUPDEBUG ) {
  77             fprintf( stderr , "[nllookup] (%d) binary search fails\n" ,
  78                 nname-1 );
  79         }
  80 #   endif /* DEBUG */
  81     return 0;
  82 }
  83
  84 arctype *
  85 arclookup(nltype *parentp, nltype *childp)
  86 {
  87     arctype     *arcp;
  88
  89     if ( parentp == 0 || childp == 0 ) {
  90         fprintf( stderr, "[arclookup] parentp == 0 || childp == 0\n" );
  91         return 0;
  92     }
  93 #   ifdef DEBUG
  94         if ( debug & LOOKUPDEBUG ) {
  95             printf( "[arclookup] parent %s child %s\n" ,
  96                     parentp -> name , childp -> name );
  97         }
  98 #   endif /* DEBUG */
  99     for ( arcp = parentp -> children ; arcp ; arcp = arcp -> arc_childlist ) {
 100 #       ifdef DEBUG
 101             if ( debug & LOOKUPDEBUG ) {
 102                 printf( "[arclookup]\t arc_parent %s arc_child %s\n" ,
 103                         arcp -> arc_parentp -> name ,
 104                         arcp -> arc_childp -> name );
 105             }
 106 #       endif /* DEBUG */
 107         if ( arcp -> arc_childp == childp ) {
 108             return arcp;
 109         }
 110     }
 111     return 0;
 112 }