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Annotation of 43BSDReno/bin/adb/common_source/sym.c, revision 1.1

1.1     ! root        1: #ifndef lint
        !             2: static char sccsid[] = "@(#)sym.c      5.2 (Berkeley) 4/9/89";
        !             3: #endif
        !             4: 
        !             5: /*
        !             6:  * adb - symbol table routines
        !             7:  */
        !             8: #include "defs.h"
        !             9: #include <stab.h>
        !            10: 
        !            11: #define        isstab(sp)      ((sp)->n_type & N_STAB)
        !            12: 
        !            13: /*
        !            14:  * Lookup a symbol by name.
        !            15:  */
        !            16: struct nlist *
        !            17: lookup(symstr)
        !            18:        register char *symstr;
        !            19: {
        !            20:        register struct nlist *sp;
        !            21: 
        !            22:        if (symtab)
        !            23:                for (sp = symtab; sp < esymtab; sp++)
        !            24:                        if (!isstab(sp) && eqsym(sp->n_un.n_name, symstr, '_'))
        !            25:                                return (sp);
        !            26:        return (0);
        !            27: }
        !            28: 
        !            29: /*
        !            30:  * Find the closest symbol to val, and return it and (through
        !            31:  * diffp) the difference between val and the symbol found.
        !            32:  */
        !            33: struct nlist *
        !            34: findsym(val, space, diffp)
        !            35:        register addr_t val;
        !            36:        int space;
        !            37:        addr_t *diffp;
        !            38: {
        !            39:        register struct nlist *sp;
        !            40:        register addr_t diff;
        !            41:        struct nlist *sym;
        !            42: 
        !            43:        diff = ~(addr_t)0;
        !            44:        sym = NULL;
        !            45:        if (space != SP_NONE && symtab != NULL) {
        !            46:                for (sp = symtab; sp < esymtab; sp++) {
        !            47:                        /* must be global */
        !            48:                        if (isstab(sp) || (sp->n_type & N_EXT) == 0)
        !            49:                                continue;
        !            50:                        /* and not a function */
        !            51:                        if (sp->n_type == (N_FN|N_EXT))
        !            52:                                continue;
        !            53:                        /* and have a greater address */
        !            54:                        if (val < sp->n_value)
        !            55:                                continue;
        !            56:                        /* and be closer than the last one */
        !            57:                        if (val - sp->n_value >= diff)
        !            58:                                continue;
        !            59:                        sym = sp;
        !            60:                        diff = val - sp->n_value;
        !            61:                        if (diff == 0)
        !            62:                                break;
        !            63:                }
        !            64:        }
        !            65:        *diffp = diff;
        !            66:        return (sym);
        !            67: }
        !            68: 
        !            69: /*
        !            70:  * Return the next local symbol after sym, or NULL at end of such locals.
        !            71:  */
        !            72: /* ARGSUSED */
        !            73: struct nlist *
        !            74: nextlocal(sym)
        !            75:        struct nlist *sym;
        !            76: {
        !            77: 
        !            78: #ifdef busted
        !            79:        /*
        !            80:         * none of this works at the moment, because the symbols are not in
        !            81:         * the desired order.
        !            82:         */
        !            83:        if (sym == NULL)
        !            84:                return (NULL);
        !            85:        while (++sym < esymtab) {
        !            86:                /*
        !            87:                 * External and file name symbols terminate the
        !            88:                 * list of local symbols.  Otherwise, if it is
        !            89:                 * a .stabs parameter or local symbol, take it.
        !            90:                 */
        !            91:                if ((sym->n_type & N_EXT) || sym->n_type == N_FN)
        !            92:                        break;
        !            93:                if (sym->n_type == N_LSYM || sym->n_type == N_PSYM)
        !            94:                        return (sym);
        !            95:        }
        !            96: #endif
        !            97:        return (NULL);
        !            98: }
        !            99: 
        !           100: /*
        !           101:  * Print value v (in format f) and then (as another format) s.
        !           102:  * If v is not zero, we look for a nearby symbol and print name+offset
        !           103:  * if we find a symbol whose offset is small enough (less than o).
        !           104:  */
        !           105: psymoff(f, v, space, o, s)
        !           106:        char *f;
        !           107:        addr_t v;
        !           108:        int space;
        !           109:        addr_t o;
        !           110:        char *s;
        !           111: {
        !           112:        struct nlist *sp;
        !           113:        addr_t offset;
        !           114: 
        !           115:        if (v && (sp = findsym(v, space, &offset)) != NULL && offset < o)
        !           116:                adbprintf("%s%?+R", sp->n_un.n_name,
        !           117:                        offset != 0, (expr_t)offset);
        !           118:        else
        !           119:                adbprintf(f, (expr_t)v);
        !           120:        adbprintf(s);
        !           121: }
        !           122: 
        !           123: /*
        !           124:  * Print value v symbolically if it has a reasonable
        !           125:  * interpretation as name+offset.  If not, print nothing.
        !           126:  * Used in printing out registers $r.
        !           127:  */
        !           128: valpr(v, space)
        !           129:        addr_t v;
        !           130:        int space;
        !           131: {
        !           132:        struct nlist *sp;
        !           133:        addr_t offset;
        !           134: 
        !           135:        if (v && (sp = findsym(v, space, &offset)) != NULL && offset < maxoff)
        !           136:                adbprintf("%s%?+R", sp->n_un.n_name,
        !           137:                        offset != 0, (expr_t)offset);
        !           138: }

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