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Annotation of 43BSDTahoe/lib/old_compiler/as/as.tahoe/asnumber.h, revision 1.1

1.1     ! root        1: /*
        !             2:  *     Copyright (c) 1982 Regents of the University of California
        !             3:  *     @(#)asnumber.h 4.3 2/14/82
        !             4:  */
        !             5: 
        !             6: union Ib_int{          /* byte */
        !             7:        u_char  Ib_uchar[1];
        !             8:        char    Ichar;
        !             9: };
        !            10: union Iw_int{          /* word */
        !            11:        u_char  Iw_uchar[2];
        !            12:        u_short Iw_ushort[1];
        !            13:        short   Iw_short;
        !            14: };
        !            15: union Il_int{          /* long word */
        !            16:        u_char  Il_uchar[4];
        !            17:        u_short Il_ushort[2];
        !            18:        u_int   Il_ulong[1];
        !            19:        int     Il_long;
        !            20: };
        !            21: 
        !            22: union Iq_int{          /* quad word */
        !            23:        u_char  Iq_uchar[8];
        !            24:        u_short Iq_ushort[4];
        !            25:        u_int   Iq_ulong[2];
        !            26: };
        !            27: 
        !            28: 
        !            29: union Ff_float{
        !            30:        u_char  Ff_uchar[4];
        !            31:        u_short Ff_ushort[2];
        !            32:        u_int   Ff_ulong[1];
        !            33:        float   Ff_value;
        !            34: };
        !            35: 
        !            36: union Fd_float{
        !            37:        u_char  Fd_uchar[8];
        !            38:        u_short Fd_ushort[4];
        !            39:        u_int   Fd_ulong[2];
        !            40:        double  Fd_value;
        !            41: };
        !            42: 
        !            43: 
        !            44: struct as_number{
        !            45:        union {
        !            46:                union Ib_int    numIb_int;
        !            47:                union Iw_int    numIw_int;
        !            48:                union Il_int    numIl_int;
        !            49:                union Iq_int    numIq_int;
        !            50:                union Ff_float  numFf_float;
        !            51:                union Fd_float  numFd_float;
        !            52:        }num_num;
        !            53:        char    num_tag;                /* the key field: TYPB..TYPUNPACKED */
        !            54:        char    num_sign;               /* the sign */
        !            55:        short   num_exponent;           /* the unexcessed exp */
        !            56: };
        !            57: typedef        struct as_number        Bignum;
        !            58: 
        !            59: extern Bignum  Znumber;                /* one all zero'ed out */
        !            60: 
        !            61: #define        num_uchar       num_num.numIq_int.Iq_uchar
        !            62: #define        num_uint        num_num.numIq_int.Iq_ulong
        !            63: #define        num_ulong       num_num.numIq_int.Iq_ulong
        !            64: #define        num_ushort      num_num.numIq_int.Iq_ushort
        !            65: /*
        !            66:  *     The following definitions must all be consistent.
        !            67:  *     They define the granularity of working on longs and quad 
        !            68:  *     words. Currently, the granularity is as large as it can be: 32 bits
        !            69:  *     in a chunk.
        !            70:  */
        !            71: #define        CH_N            2               /* number of pieces */
        !            72: #define        CH_BITS         32              /* number of bits per piece */
        !            73: #define        CH_FIELD(x)     ((x).num_num.numIq_int.Iq_ulong)
        !            74: typedef        u_int           *chptr;         /* basic data type */
        !            75: #define SIGNBIT                0x80000000
        !            76: 
        !            77: #define        HOC             (CH_N - 1)      /* high order chunk */
        !            78: #if 0
        !            79: #define        MAXINT_1        ((unsigned)(1<<(CH_BITS - 1)))
        !            80: #define        MAXINT_10       ((unsigned)((MAXINT_1/(unsigned)10)))
        !            81: #define        MAXINT_5        ((unsigned)((MAXINT_1/(unsigned)5)))
        !            82: #else not 0
        !            83: /*
        !            84:  *     These values were computed using dc, so are exact.
        !            85:  *     Only MAXINT_10 and MAXINT_5 are used in the programs.
        !            86:  */
        !            87: #define        MAXINT_1        2147483648
        !            88: #define        MAXINT_10       214748364
        !            89: #define        MAXINT_5        429496729
        !            90: #endif not 0
        !            91: 
        !            92: Bignum as_atoi();              /* converts string to integer */
        !            93: Bignum as_atof();              /* converts string to float */
        !            94: 
        !            95: /*
        !            96:  *     Definitions for overflows.
        !            97:  */
        !            98: typedef        u_int   Ovf;
        !            99: 
        !           100: #define        OVF_ADDV        (1<<0)  /* integer: adding two vectors overflowed */
        !           101: #define        OVF_LSHIFT      (1<<1)  /* integer: left shifting a vector lost bits */
        !           102: #define        OVF_POSOVF      (1<<2)  /* integer: positive number overflowed */
        !           103: #define        OVF_MAXINT      (1<<3)  /* integer: the number was the maxint + 1*/
        !           104: #define        OVF_F           (1<<4)  /* float: F overflow */
        !           105: #define        OVF_D           (1<<5)  /* float: D overflow */
        !           106: #define        OVF_OVERFLOW    (1<<9)  /* overflow in conversion */
        !           107: #define        OVF_UNDERFLOW   (1<<10) /* underflow in conversion */
        !           108: 
        !           109: Ovf    posovf();
        !           110: Ovf    numclear();
        !           111: Ovf    numshift();
        !           112: Ovf    numaddv();
        !           113: Ovf    numaddd();
        !           114: Ovf    num1comp();
        !           115: Ovf    numnegate();
        !           116: /*
        !           117:  *     Bit manipulations
        !           118:  */
        !           119: #define        ONES(n) ((1 << (n)) - 1)
        !           120: /*
        !           121:  *     Assertions
        !           122:  */
        !           123: #if 1
        !           124: #define        assert(x, str) if (!(x)) panic("%s%s\n", "x", str)
        !           125: #else
        !           126: #define assert(x, str)
        !           127: #endif

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