140 lines
3.8 KiB
C
140 lines
3.8 KiB
C
/*
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* Copyright (c) 1983 Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that: (1) source distributions retain this entire copyright
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* notice and comment, and (2) distributions including binaries display
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* the following acknowledgement: ``This product includes software
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* developed by the University of California, Berkeley and its contributors''
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* in the documentation or other materials provided with the distribution
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* and in all advertising materials mentioning features or use of this
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* software. Neither the name of the University nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#ifndef lint
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static char sccsid[] = "@(#)lookup.c 5.4 (Berkeley) 6/1/90";
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#endif /* not lint */
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#include "gprof.h"
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/*
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* 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.
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*/
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#ifdef DEBUG
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nltype *dbg_nllookup();
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#endif
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nltype *
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nllookup( address )
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unsigned long address;
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{
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register long low;
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register long middle;
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register long high;
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# ifdef DEBUG
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register int probes;
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probes = 0;
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# endif DEBUG
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for ( low = 0 , high = nname - 1 ; low != high ; ) {
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# ifdef DEBUG
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probes += 1;
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# endif DEBUG
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middle = ( high + low ) >> 1;
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if ( nl[ middle ].value <= address && nl[ middle+1 ].value > address ) {
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# ifdef DEBUG
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if ( debug & LOOKUPDEBUG ) {
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printf( "[nllookup] %d (%d) probes\n" , probes , nname-1 );
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}
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# endif DEBUG
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return &nl[ middle ];
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}
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if ( nl[ middle ].value > address ) {
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high = middle;
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} else {
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low = middle + 1;
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}
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}
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if(nl[middle+1].value <= address) {
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# ifdef DEBUG
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if (debug & LOOKUPDEBUG ) {
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printf("[nllookup] %d (%d) probes, fall off\n", probes, nname-1);
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}
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# endif
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return &nl[middle+1];
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}
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fprintf( stderr , "[nllookup] binary search fails???\n" );
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#ifdef DEBUG
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dbg_nllookup(address);
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#endif
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return 0;
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}
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#ifdef DEBUG
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nltype *
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dbg_nllookup( address )
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unsigned long address;
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{
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register long low;
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register long middle;
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register long high;
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fprintf(stderr,"[nllookup] address 0x%x\n",address);
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for ( low = 0 , high = nname - 1 ; low != high ; ) {
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middle = ( high + low ) >> 1;
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fprintf(stderr, "[nllookup] low 0x%x middle 0x%x high 0x%x nl[m] 0x%x nl[m+1] 0x%x\n",
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low,middle,high,nl[middle].value,nl[middle+1].value);
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if ( nl[ middle ].value <= address && nl[ middle+1 ].value > address) {
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return &nl[ middle ];
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}
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if ( nl[ middle ].value > address ) {
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high = middle;
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} else {
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low = middle + 1;
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}
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}
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fprintf( stderr , "[nllookup] binary search fails???\n" );
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return 0;
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}
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#endif DEBUG
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arctype *
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arclookup( parentp , childp )
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nltype *parentp;
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nltype *childp;
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{
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arctype *arcp;
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if ( parentp == 0 || childp == 0 ) {
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printf( "[arclookup] parentp == 0 || childp == 0\n" );
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return 0;
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}
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# ifdef DEBUG
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if ( debug & LOOKUPDEBUG ) {
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printf( "[arclookup] parent %s child %s\n" ,
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parentp -> name , childp -> name );
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}
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# endif DEBUG
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for ( arcp = parentp -> children ; arcp ; arcp = arcp -> arc_childlist ) {
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# ifdef DEBUG
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if ( debug & LOOKUPDEBUG ) {
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printf( "[arclookup]\t arc_parent %s arc_child %s\n" ,
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arcp -> arc_parentp -> name ,
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arcp -> arc_childp -> name );
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}
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# endif DEBUG
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if ( arcp -> arc_childp == childp ) {
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return arcp;
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}
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}
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return 0;
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}
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