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Annotation of 43BSD/contrib/xns/compiler/symbols.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (C) 1984 by Eric C. Cooper.
        !             3:  * All rights reserved.
        !             4:  */
        !             5: #ifndef lint
        !             6: static char RCSid[] = "$Header: symbols.c,v 2.0 85/11/21 07:21:46 jqj Exp $";
        !             7: #endif
        !             8: 
        !             9: /* $Log:       symbols.c,v $
        !            10:  * Revision 2.0  85/11/21  07:21:46  jqj
        !            11:  * 4.3BSD standard release
        !            12:  * 
        !            13:  * Revision 1.4  85/03/26  06:10:36  jqj
        !            14:  * *** empty log message ***
        !            15:  * 
        !            16:  * Revision 1.4  85/03/26  06:10:36  jqj
        !            17:  * Revised public alpha-test version, released 26 March 1985
        !            18:  * 
        !            19:  * Revision 1.3  85/03/11  16:40:14  jqj
        !            20:  * Public alpha-test version, released 11 March 1985
        !            21:  * 
        !            22:  * Revision 1.2  85/02/21  11:06:00  jqj
        !            23:  * alpha test version
        !            24:  * 
        !            25:  * Revision 1.1  85/02/15  13:55:40  jqj
        !            26:  * Initial revision
        !            27:  * 
        !            28:  */
        !            29: 
        !            30: /*
        !            31:  * Symbol table management routines
        !            32:  */
        !            33: 
        !            34: #include "compiler.h"
        !            35: 
        !            36: struct object *SymbolTables;
        !            37: struct object EnumSymbols;
        !            38: /*
        !            39: 
        !            40:  * Symbol table management.  Find a symbol given a known symbol table.
        !            41:  * The routines lookup() and addsymbol() are the ONLY routines that
        !            42:  * understand the format of the symbol table, and should be the only
        !            43:  * routines that use ocar() and ocdr().
        !            44:  */
        !            45: static struct object *
        !            46: lookup(name, symlist)
        !            47:        char *name;
        !            48:        struct object *symlist;
        !            49: {
        !            50:        struct object *op;
        !            51: 
        !            52:        for (op = symlist; op != ONIL; op = ocdr(op)) {
        !            53:                if (streq(op->o_name, name))
        !            54:                        return (op);
        !            55:        }
        !            56:        return (ONIL);
        !            57: }
        !            58: 
        !            59: static struct object *
        !            60: addsymbol(name,osymp)
        !            61:        char *name;
        !            62:        struct object **osymp;
        !            63: {
        !            64:        struct object *o;
        !            65: 
        !            66:        o = New(struct object);
        !            67:        o->o_class = O_UNKNOWN;
        !            68:        /* (jqj)? use binary-tree symboltable here */
        !            69:        ocdr(o) = *osymp;
        !            70:        *osymp = o;
        !            71:        o->o_name = copy(name);
        !            72:        return(o);
        !            73: }
        !            74: 
        !            75: struct object *
        !            76: make_symbol(name,symboltablename)
        !            77:        char *name;
        !            78:        char *symboltablename;
        !            79: {
        !            80:        struct object *osym, *rsym;
        !            81: 
        !            82:        if (symboltablename == NULL) {
        !            83:                rsym = addsymbol(name, &(EnumSymbols.o_symboltable));
        !            84:                rsym->o_module = "";    /* not NULL */
        !            85:                rsym->o_modnumber = 0;
        !            86:                rsym->o_modversion = 0;
        !            87:                return(rsym);
        !            88:        }
        !            89:        else if ((osym = lookup(symboltablename, SymbolTables))) {
        !            90:                rsym = addsymbol(name, &(osym->o_symboltable));
        !            91:                rsym->o_module = osym->o_module;
        !            92:                rsym->o_modnumber = osym->o_modnumber;
        !            93:                rsym->o_modversion = osym->o_modversion;
        !            94:                return(rsym);
        !            95:        }
        !            96:        else {
        !            97:                error(ERROR,"Internal error:  Symbol table %s undefined.",
        !            98:                        symboltablename);
        !            99:                return(ONIL);
        !           100:        }
        !           101: }
        !           102: 
        !           103: struct object *
        !           104: make_module(name,number,version)
        !           105:        char *name;             /* Courier module name */
        !           106:        char *number;           /* Courier program number */
        !           107:        char *version;
        !           108: {
        !           109:        struct object *symbol;
        !           110: 
        !           111:        symbol = addsymbol(name, &SymbolTables);
        !           112:        symbol->o_class = O_SYMBOLTABLE;
        !           113:        symbol->o_name = name;
        !           114:        symbol->o_module = name;
        !           115:        symbol->o_modnumber = stringtocard(number);
        !           116:        symbol->o_modversion = stringtocard(version);
        !           117:        return(symbol);
        !           118: }
        !           119: 
        !           120: /*
        !           121:  * Check that a program name, number, version group is already defined.
        !           122:  * Returns TRUE if name, number, and version all match
        !           123:  */
        !           124:  check_module_def(name,number,version)
        !           125:        char *name, *number, *version;
        !           126: {
        !           127:        struct object *module;
        !           128: 
        !           129:        if ((module = lookup(name, SymbolTables)) == (struct object *) NULL)
        !           130:                return(0);
        !           131:        if (stringtocard(version) != module->o_modversion ||
        !           132:            stringtocard(number) != module->o_modnumber)
        !           133:                return(0);
        !           134:        return(1);      /* for now */
        !           135: }
        !           136: 
        !           137: /*
        !           138:  * Check that a program name was listed in the DEPENDS UPON list.
        !           139:  * returns a pointer to the symbol if defined, else 0.
        !           140:  */
        !           141: check_dependency(name)
        !           142:        char *name;
        !           143: {
        !           144:        return((int) lookup(name, SymbolTables));
        !           145: }
        !           146: 
        !           147: /* (jqj) */
        !           148: struct object *
        !           149: check_def(symbol,symboltablename)
        !           150:        char *symbol;           /* name of the symbol */
        !           151:        char *symboltablename;  /* symbol table to examine */
        !           152: {
        !           153:        struct object *osym;
        !           154: 
        !           155:        if (symboltablename == NULL) {
        !           156:                osym = &EnumSymbols;
        !           157:        }
        !           158:        else if (! (osym = lookup(symboltablename, SymbolTables))) {
        !           159:                error(ERROR,"Internal error:  Symbol table %s undefined.",symboltablename);
        !           160:                return(ONIL);
        !           161:        }
        !           162:        return(lookup(symbol, osym->o_symboltable));
        !           163: }
        !           164: 
        !           165: 
        !           166: static char gensymstr[MAXSTR];
        !           167: 
        !           168: char *
        !           169: gensym(leader)
        !           170:        char *leader;
        !           171: {
        !           172:        static int n;
        !           173:        char buf[MAXSTR];
        !           174: 
        !           175:        (void) sprintf(buf, "%s%s_%d", leader, gensymstr, ++n);
        !           176:        return (copy(buf));
        !           177: }
        !           178: 
        !           179: setgensym(number,version)
        !           180:        char *number, *version;
        !           181: {
        !           182:        (void) sprintf(gensymstr,"%s",number);
        !           183: }
        !           184: 
        !           185: define_enumeration_symbol(sym, value)
        !           186:        struct object *sym;
        !           187:        char *value;
        !           188: {
        !           189:        class_of(sym) = O_ENUMTAG;
        !           190:        sym->o_enum = New(struct enumtag);
        !           191:        sym->o_enum->en_name = name_of(sym);
        !           192:        sym->o_enum->en_value = stringtocard(value);
        !           193: }

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