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- /*
- * Copyright (c) 1983 Regents of the University of California.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms are permitted
- * provided that: (1) source distributions retain this entire copyright
- * notice and comment, and (2) distributions including binaries display
- * the following acknowledgement: ``This product includes software
- * developed by the University of California, Berkeley and its contributors''
- * in the documentation or other materials provided with the distribution
- * and in all advertising materials mentioning features or use of this
- * software. 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 ``AS IS'' AND WITHOUT ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
- */
-
- #ifndef lint
- static char sccsid[] = "@(#)lookup.c 5.4 (Berkeley) 6/1/90";
- #endif /* not lint */
-
- #include "gprof.h"
-
- /*
- * look up an address in a sorted-by-address namelist
- * this deals with misses by mapping them to the next lower
- * entry point.
- */
- #ifdef DEBUG
- nltype *dbg_nllookup();
- #endif
-
- nltype *
- nllookup( address )
- unsigned long address;
- {
- register long low;
- register long middle;
- register long high;
- # ifdef DEBUG
- register int probes;
-
- probes = 0;
- # endif DEBUG
- for ( low = 0 , high = nname - 1 ; low != high ; ) {
- # ifdef DEBUG
- probes += 1;
- # endif DEBUG
- 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
- return &nl[ middle ];
- }
- if ( nl[ middle ].value > address ) {
- high = middle;
- } else {
- low = middle + 1;
- }
- }
- if(nl[middle+1].value <= address) {
- # ifdef DEBUG
- if (debug & LOOKUPDEBUG ) {
- printf("[nllookup] %d (%d) probes, fall off\n", probes, nname-1);
- }
- # endif
- return &nl[middle+1];
- }
- fprintf( stderr , "[nllookup] binary search fails???\n" );
- #ifdef DEBUG
- dbg_nllookup(address);
- #endif
- return 0;
- }
-
- #ifdef DEBUG
- nltype *
- dbg_nllookup( address )
- unsigned long address;
- {
- register long low;
- register long middle;
- register long high;
- fprintf(stderr,"[nllookup] address 0x%x\n",address);
-
- for ( low = 0 , high = nname - 1 ; low != high ; ) {
-
- middle = ( high + low ) >> 1;
- fprintf(stderr, "[nllookup] low 0x%x middle 0x%x high 0x%x nl[m] 0x%x nl[m+1] 0x%x\n",
- low,middle,high,nl[middle].value,nl[middle+1].value);
- if ( nl[ middle ].value <= address && nl[ middle+1 ].value > address) {
- return &nl[ middle ];
- }
- if ( nl[ middle ].value > address ) {
- high = middle;
- } else {
- low = middle + 1;
- }
- }
- fprintf( stderr , "[nllookup] binary search fails???\n" );
- return 0;
- }
- #endif DEBUG
-
- arctype *
- arclookup( parentp , childp )
- nltype *parentp;
- nltype *childp;
- {
- arctype *arcp;
-
- if ( parentp == 0 || childp == 0 ) {
- printf( "[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
- 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
- if ( arcp -> arc_childp == childp ) {
- return arcp;
- }
- }
- return 0;
- }
-