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Annotation of 43BSD/ucb/pascal/pdx/mappings/functab.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1980 Regents of the University of California.
                      3:  * All rights reserved.  The Berkeley software License Agreement
                      4:  * specifies the terms and conditions for redistribution.
                      5:  */
                      6: 
                      7: #ifndef lint
                      8: static char sccsid[] = "@(#)functab.c  5.1 (Berkeley) 6/6/85";
                      9: #endif not lint
                     10: /*
                     11:  * This file contains the implementation of a table for going
                     12:  * from object addresses to the functions in which they belong.
                     13:  */
                     14: 
                     15: #include "defs.h"
                     16: #include "mappings.h"
                     17: #include "sym.h"
                     18: 
                     19: #define MAXNFUNCS 1001         /* maximum number of functions allowed */
                     20: 
                     21: LOCAL SYM *functab[MAXNFUNCS];
                     22: LOCAL int nfuncs;
                     23: 
                     24: /*
                     25:  * Insert a new function into the table.
                     26:  * The table is ordered by object address.
                     27:  */
                     28: 
                     29: newfunc(f)
                     30: SYM *f;
                     31: {
                     32:        register int i, j;
                     33:        ADDRESS a;
                     34: 
                     35:        if (nfuncs >= MAXNFUNCS) {
                     36:                panic("too many procedures/functions");
                     37:        }
                     38:        a = codeloc(f);
                     39:        i = 0;
                     40:        while (i < nfuncs && codeloc(functab[i]) < a) {
                     41:                i++;
                     42:        }
                     43:        for (j = nfuncs; j > i; j--) {
                     44:                functab[j] = functab[j - 1];
                     45:        }
                     46:        functab[i] = f;
                     47:        nfuncs++;
                     48: }
                     49: 
                     50: /*
                     51:  * Return the function that begins at the given address.
                     52:  */
                     53: 
                     54: SYM *whatblock(addr)
                     55: ADDRESS addr;
                     56: {
                     57:        register SYM *p;
                     58:        register int i, j, k;
                     59:        ADDRESS a;
                     60: 
                     61:        i = 0;
                     62:        j = nfuncs - 1;
                     63:        if (addr < codeloc(functab[i])) {
                     64:                return program;
                     65:        } else if (addr == codeloc(functab[i])) {
                     66:                return functab[i];
                     67:        } else if (addr >= codeloc(functab[j])) {
                     68:                return functab[j];
                     69:        }
                     70:        while (i <= j) {
                     71:                k = (i + j) / 2;
                     72:                a = codeloc(functab[k]);
                     73:                if (a == addr) {
                     74:                        return functab[k];
                     75:                } else if (addr > a) {
                     76:                        i = k+1;
                     77:                } else {
                     78:                        j = k-1;
                     79:                }
                     80:        }
                     81:        if (addr > codeloc(functab[i])) {
                     82:                return functab[i];
                     83:        } else {
                     84:                return functab[i-1];
                     85:        }
                     86:        /* NOTREACHED */
                     87: }
                     88: 
                     89: /*
                     90:  * Clear out the functab, used when re-reading the object information.
                     91:  */
                     92: 
                     93: clrfunctab()
                     94: {
                     95:        nfuncs = 0;
                     96: }

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