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Annotation of 41BSD/cmd/as/asscan.h, revision 1.1

1.1     ! root        1: /* Copyright (c) 1980 Regents of the University of California */
        !             2: /* "@(#)asscan.h 4.3 8/15/80" */
        !             3: /*
        !             4:  *     The character scanner is called to fill up one token buffer
        !             5:  *
        !             6:  *     However, once the tokens are filled up by the
        !             7:  *     character scanner, they are used in both the first and the second
        !             8:  *     pass.  Holes created by .stab removal are replaced
        !             9:  *     with 'skip' tokens that direct the second pass to ignore the
        !            10:  *     following tokens.
        !            11:  */
        !            12: 
        !            13: #define TOKBUFLG               BUFSIZ
        !            14: #define MAXVAX                 32              
        !            15: #define SAFETY                 16
        !            16: 
        !            17: #define AVAILTOKS              TOKBUFLG -\
        !            18:                sizeof(int) -\
        !            19:                sizeof (struct tokbufdesc *) -\
        !            20:                MAXVAX - SAFETY
        !            21: 
        !            22: struct tokbufdesc{
        !            23:        int             tok_count;              /*absolute byte length*/
        !            24:        struct          tokbufdesc *tok_next;
        !            25:        char            toks[AVAILTOKS];
        !            26:        char            bufovf[MAXVAX + SAFETY];
        !            27: };
        !            28: /*
        !            29:  *     Definitions for handling tokens in the intermediate file
        !            30:  *     buffers.
        !            31:  *
        !            32:  *     We want to have the compiler produce the efficient auto increment
        !            33:  *     instruction for stepping through the buffer of tokens.  We must
        !            34:  *     fool the type checker into thinking that a pointer can point
        !            35:  *     to various size things.
        !            36:  */
        !            37: 
        !            38: typedef char toktype;
        !            39: 
        !            40: typedef char *ptrall;                  /*all uses will be type cast*/
        !            41: typedef short lgtype;                  /*for storing length of strings or skiping*/
        !            42: /*
        !            43:  *     defintions for putting various typed values
        !            44:  *     into the intermediate buffers
        !            45:  *     ptr will ALWAYS be of type ptrall
        !            46:  */
        !            47: 
        !            48: #define        pchar(ptr,val)          *ptr++  = val
        !            49: #define        puchar(ptr,val)         *ptr++  = val
        !            50: 
        !            51: #define        pshort(ptr,val)         *(short *)ptr=val,      ptr += sizeof(short)
        !            52: #define        pushort(ptr,val)        *(unsigned short *)ptr=val,     ptr += sizeof(short)
        !            53: #define        pint(ptr,val)           *(int *)ptr  = val,     ptr += sizeof(int)
        !            54: #define        puint(ptr,val)          *(unsigned int *)ptr=val,       ptr += sizeof(int)
        !            55: #define        plong(ptr,val)          *(long *)ptr  = val,    ptr += sizeof(long)
        !            56: #define        pulong(ptr,val)         *(unsigned long *)ptr=val,      ptr += sizeof(long)
        !            57: #define        pfloat(ptr,val)         *(float *)ptr  = val,   ptr += sizeof (float)
        !            58: #define        pdouble(ptr,val)        *(double *)ptr  = val,  ptr += sizeof (double)
        !            59: #define        pptr(ptr,val)           *(int *)ptr  = (val),   ptr += sizeof(ptrall)
        !            60: #define        ptoken(ptr,val)         *ptr++  = val
        !            61: #define        pstrlg(ptr,val)         *(lgtype *)ptr  = val,  ptr += sizeof(short)
        !            62: #define        pskiplg(ptr,val)        *(lgtype *)ptr  = val,  ptr += sizeof(short)
        !            63: 
        !            64: #define        gchar(val, ptr)         val = *ptr++
        !            65: #define        guchar(val, ptr)        val = *ptr++
        !            66: 
        !            67: #define        gshort(val, ptr)        val = *(short *)ptr , ptr += sizeof (short)
        !            68: #define        gushort(val, ptr)       val = *(unsigned short *)ptr , ptr += sizeof (short)
        !            69: #define        gint(val, ptr)          val = *(int *)ptr, ptr += sizeof (int)
        !            70: #define        guint(val, ptr)         val = *(unsigend int *)ptr, ptr += sizeof (int)
        !            71: #define        glong(val, ptr)         val = *(long *)ptr, ptr += sizeof (long)
        !            72: #define        gulong(val, ptr)        val = *(unsigned long *)ptr, ptr += sizeof (long)
        !            73: #define        gfloat(val, ptr)        val = *(float *)ptr, ptr += sizeof (float)
        !            74: #define        gdouble(val, ptr)       val = *(double *)ptr, ptr += sizeof (double)
        !            75: #define        gptr(val, ptr)          val = *(int *)ptr, ptr += sizeof (ptrall)
        !            76: #define        gtoken(val, ptr)        val = *ptr++
        !            77: #define        gstrlg(val, ptr)        val = *(lgtype *)ptr, ptr += sizeof (short)
        !            78: #define        gskiplg(val, ptr)       val = *(lgtype *)ptr, ptr += sizeof (short)
        !            79: 
        !            80: 
        !            81: extern ptrall tokptr;  /*the next token to consume, call by copy*/
        !            82: extern ptrall tokub;   /*current upper bound in the current buffer*/
        !            83: 
        !            84: /*
        !            85:  *     Strings are known for their characters and for their length.
        !            86:  *     We cannot use a normal zero termination byte, because strings
        !            87:  *     can contain anything.
        !            88:  *
        !            89:  *     We have two "strings", so that an input string that is too long can be
        !            90:  *     split across two string buffers, and not confuse the yacc grammar.
        !            91:  *     (This is probably superflous)
        !            92:  *
        !            93:  *     We have a third string of nulls so that the .skip can be 
        !            94:  *     handled in the same way as strings.
        !            95:  */
        !            96: #define MAXSTRLG       127
        !            97: 
        !            98: struct strdesc{
        !            99:        char            str_lg;
        !           100:        char            str[MAXSTRLG];
        !           101: };
        !           102: 
        !           103: extern struct  strdesc         strbuf[3];
        !           104: extern struct  strdesc         *strptr;        /*points to the current string*/
        !           105: extern int                     strno;          /*the current string being filled*/
        !           106: char   *savestr();

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