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Annotation of coherent/d/bin/cc/c/n2/getfun.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * The routines in this file handle
        !             3:  * the reading in of functions. The internal data
        !             4:  * structures are built and threaded together.
        !             5:  */
        !             6: #ifdef   vax
        !             7: #include "INC$LIB:cc2.h"
        !             8: #else
        !             9: #include "cc2.h"
        !            10: #endif
        !            11: 
        !            12: /*
        !            13:  * Read in a function.
        !            14:  * Pack it into the internal data structure.
        !            15:  * Copy non shared stuff straight through to save
        !            16:  * both space and time. Switch tables are in the
        !            17:  * shared data, so this works w.r.t. label reference
        !            18:  * counts. The PROLOG item has been already read.
        !            19:  */
        !            20: getfunc()
        !            21: {
        !            22:        register INS    *ip;
        !            23: 
        !            24:        ins.i_fp = &ins;
        !            25:        ins.i_bp = &ins;
        !            26:        for (;;) {
        !            27:                ip = getins();
        !            28:                if (dotseg<0 || isshared(dotseg)==0
        !            29:                || (ip->i_type==ENTER && isshared(ip->i_seg)==0)) {
        !            30:                        genins(ip);
        !            31:                        free((char *) ip);
        !            32:                        continue;
        !            33:                }
        !            34:                ip->i_fp = &ins;
        !            35:                ip->i_bp = ins.i_bp;
        !            36:                ins.i_bp->i_fp = ip;
        !            37:                ins.i_bp = ip;
        !            38:                if (ip->i_type == EPILOG)
        !            39:                        break;
        !            40:        }
        !            41: }
        !            42: 
        !            43: /*
        !            44:  * This routine reads an item from
        !            45:  * the input file and constructs and INS node
        !            46:  * to hold it. A pointer to the INS node is
        !            47:  * returned. Any format errors are fatal.
        !            48:  */
        !            49: INS *
        !            50: getins()
        !            51: {
        !            52:        register INS    *ip;
        !            53:        register int    op;
        !            54: 
        !            55: loop:
        !            56:        op = bget();
        !            57:        switch (op) {
        !            58: 
        !            59:        case ENTER:
        !            60:                ip = newi(sizeof(INS));
        !            61:                ip->i_seg = bget();
        !            62:                break;
        !            63: 
        !            64:        case FNAME:
        !            65:                sget(file, NFNAME);
        !            66:                goto loop;
        !            67: 
        !            68:        case LINE:
        !            69:                line = iget();
        !            70:                ip = newi(sizeof(INS));
        !            71:                ip->i_line = line;
        !            72:                break;
        !            73: 
        !            74:        case DLABEL:
        !            75:                gendbgt(1);
        !            76:                goto loop;
        !            77: 
        !            78:        case AUTOS:
        !            79:                getautos();
        !            80:                goto loop;
        !            81: 
        !            82:        case BLOCK:
        !            83:                ip = newi(sizeof(INS));
        !            84:                ip->i_len = zget();
        !            85:                break;
        !            86: 
        !            87:        case LLABEL:
        !            88:                ip = newi(sizeof(INS));
        !            89:                ip->i_labno = iget();
        !            90:                ip->i_sp = NULL;
        !            91:                ip->i_refc = 0;
        !            92:                break;
        !            93: 
        !            94: #ifdef KLUDGE
        !            95:        case SGUESS:
        !            96:        {
        !            97:                register SYM *sp;
        !            98:                int seg;
        !            99:                sget(id, NCSYMB);
        !           100:                seg = bget();
        !           101:                sp = glookup(id, 0);
        !           102:                if ((sp->s_flag&S_DEF) == 0)
        !           103:                        sp->s_seg = seg;
        !           104:                goto loop;
        !           105:        }
        !           106: 
        !           107: #endif
        !           108:        case EPILOG:
        !           109:                ip = newi(sizeof(INS));
        !           110:                break;
        !           111: 
        !           112:        case ALIGN:
        !           113:                ip = newi(sizeof(INS));
        !           114:                ip->i_align = bget();
        !           115:                break;
        !           116: 
        !           117:        case CODE:
        !           118:                return (getcode());
        !           119: 
        !           120:        case EOF:
        !           121:                cfatal("unexpected EOF");
        !           122: 
        !           123:        default:
        !           124:                cbotch("bad temporary file opcode %d", op);
        !           125:        }
        !           126:        ip->i_type = op;
        !           127:        ip->i_fp = ip->i_bp = NULL;
        !           128:        return (ip);
        !           129: }
        !           130: 
        !           131: /*
        !           132:  * Return true if segment "s" is
        !           133:  * shared. All local label references must be
        !           134:  * in a shared segment, or label reference counting
        !           135:  * will get screwed up. This includes the dispatch
        !           136:  * tables of switch statements.
        !           137:  */
        !           138: isshared(s)
        !           139: {
        !           140:        if (s==SCODE || s==SPURE)
        !           141:                return (1);
        !           142:        return (0);
        !           143: }
        !           144: 
        !           145: /*
        !           146:  * Allocate a new INS node.
        !           147:  */
        !           148: INS *
        !           149: newi(n)
        !           150: {
        !           151:        register INS    *ip;
        !           152: 
        !           153:        if ((ip = (INS *) malloc(n)) == NULL)
        !           154:                cnomem("newi");
        !           155:        return (ip);
        !           156: }
        !           157: 
        !           158: /*
        !           159:  * Allocate a new INS node with
        !           160:  * an `n' element `i_af' field on the end.
        !           161:  */
        !           162: INS *
        !           163: newn(n)
        !           164: {
        !           165:        return (newi(sizeof(INS)+n*sizeof(struct afield)));
        !           166: }

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