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Annotation of 42BSD/ucb/pascal/pdx/mappings/functab.c, revision 1.1.1.1

1.1       root        1: /* Copyright (c) 1982 Regents of the University of California */
                      2: 
                      3: static char sccsid[] = "@(#)functab.c 1.1 1/18/82";
                      4: 
                      5: /*
                      6:  * This file contains the implementation of a table for going
                      7:  * from object addresses to the functions in which they belong.
                      8:  */
                      9: 
                     10: #include "defs.h"
                     11: #include "mappings.h"
                     12: #include "sym.h"
                     13: 
                     14: #define MAXNFUNCS 1001         /* maximum number of functions allowed */
                     15: 
                     16: LOCAL SYM *functab[MAXNFUNCS];
                     17: LOCAL int nfuncs;
                     18: 
                     19: /*
                     20:  * Insert a new function into the table.
                     21:  * The table is ordered by object address.
                     22:  */
                     23: 
                     24: newfunc(f)
                     25: SYM *f;
                     26: {
                     27:        register int i, j;
                     28:        ADDRESS a;
                     29: 
                     30:        if (nfuncs >= MAXNFUNCS) {
                     31:                panic("too many procedures/functions");
                     32:        }
                     33:        a = codeloc(f);
                     34:        i = 0;
                     35:        while (i < nfuncs && codeloc(functab[i]) < a) {
                     36:                i++;
                     37:        }
                     38:        for (j = nfuncs; j > i; j--) {
                     39:                functab[j] = functab[j - 1];
                     40:        }
                     41:        functab[i] = f;
                     42:        nfuncs++;
                     43: }
                     44: 
                     45: /*
                     46:  * Return the function that begins at the given address.
                     47:  */
                     48: 
                     49: SYM *whatblock(addr)
                     50: ADDRESS addr;
                     51: {
                     52:        register SYM *p;
                     53:        register int i, j, k;
                     54:        ADDRESS a;
                     55: 
                     56:        i = 0;
                     57:        j = nfuncs - 1;
                     58:        if (addr < codeloc(functab[i])) {
                     59:                return program;
                     60:        } else if (addr == codeloc(functab[i])) {
                     61:                return functab[i];
                     62:        } else if (addr >= codeloc(functab[j])) {
                     63:                return functab[j];
                     64:        }
                     65:        while (i <= j) {
                     66:                k = (i + j) / 2;
                     67:                a = codeloc(functab[k]);
                     68:                if (a == addr) {
                     69:                        return functab[k];
                     70:                } else if (addr > a) {
                     71:                        i = k+1;
                     72:                } else {
                     73:                        j = k-1;
                     74:                }
                     75:        }
                     76:        if (addr > codeloc(functab[i])) {
                     77:                return functab[i];
                     78:        } else {
                     79:                return functab[i-1];
                     80:        }
                     81:        /* NOTREACHED */
                     82: }
                     83: 
                     84: /*
                     85:  * Clear out the functab, used when re-reading the object information.
                     86:  */
                     87: 
                     88: clrfunctab()
                     89: {
                     90:        nfuncs = 0;
                     91: }

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