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Annotation of coherent/b/bin/c/n2/i8086/afield.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * The functions in this file
        !             3:  * handle the management of address fields
        !             4:  * in the intermediate file. It converts the tree
        !             5:  * like items into `afield' structures.
        !             6:  */
        !             7: #ifdef   vax
        !             8: #include "INC$LIB:cc2.h"
        !             9: #else
        !            10: #include "cc2.h"
        !            11: #endif
        !            12: 
        !            13: /*
        !            14:  * Read in an address field. The style
        !            15:  * of the address is determined by flag bits that
        !            16:  * hide in the address mode. These bits are cleared away
        !            17:  * when the mode is actually stored in the afield.
        !            18:  */
        !            19: getfield(opcode, afp)
        !            20: register AFIELD        *afp;
        !            21: {
        !            22:        register int    mode;
        !            23: 
        !            24:        mode = iget();
        !            25:        afp->a_mode = mode & (A_PREFX|A_AMOD|A_REGM);
        !            26:        afp->a_sp = NULL;
        !            27:        afp->a_value = 0;
        !            28:        if ((mode&A_OFFS) != 0)
        !            29:                afp->a_value = iget();
        !            30:        if ((mode&A_LID) != 0)
        !            31:                afp->a_sp = llookup(iget(), 0);
        !            32:        else if ((mode&A_GID) != 0) {
        !            33:                sget(id, NCSYMB);
        !            34:                afp->a_sp = glookup(id, 0);
        !            35:        }
        !            36: }
        !            37: 
        !            38: /*
        !            39:  * Unassemble an address field.
        !            40:  * Output the unassembly to the output file
        !            41:  * in intermediate file format.
        !            42:  */
        !            43: genfield(afp, flag)
        !            44: register AFIELD        *afp;
        !            45: {
        !            46:        register SYM    *sp;
        !            47:        register int    mode;
        !            48: 
        !            49:        mode = afp->a_mode;
        !            50:        if (afp->a_value != 0 || (mode&A_AMOD)==A_IMM)
        !            51:                mode |= A_OFFS;
        !            52:        if ((sp = afp->a_sp) != NULL) {
        !            53:                if ((sp->s_flag&S_LABNO) != 0)
        !            54:                        mode |= A_LID;
        !            55:                else
        !            56:                        mode |= A_GID;
        !            57:        }
        !            58:        iput(mode);
        !            59:        if ((mode&A_OFFS) != 0)
        !            60:                iput(afp->a_value);
        !            61:        if ((mode&A_LID) != 0)
        !            62:                iput(sp->s_labno);
        !            63:        else if ((mode&A_GID) != 0)
        !            64:                sput(sp->s_id);
        !            65: }
        !            66: 
        !            67: /*
        !            68:  * Compare the address field parts of
        !            69:  * two instructions.
        !            70:  */
        !            71: cmpfield(ip1, ip2)
        !            72: INS    *ip1, *ip2;
        !            73: {
        !            74:        register AFIELD *afp1, *afp2;
        !            75:        register int    n;
        !            76: 
        !            77:        if ((n = ip1->i_naddr) != 0) {
        !            78:                afp1 = &ip1->i_af[0];
        !            79:                afp2 = &ip2->i_af[0];
        !            80:                do {
        !            81:                        if (afp1->a_mode != afp2->a_mode
        !            82:                        ||  afp1->a_sp != afp2->a_sp
        !            83:                        ||  afp1->a_value != afp2->a_value)
        !            84:                                return (0);
        !            85:                        ++afp1;
        !            86:                        ++afp2;
        !            87:                } while (--n);
        !            88:        }
        !            89:        return (1);
        !            90: }

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