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