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Annotation of 43BSD/bin/as/asscan.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1982 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  *
        !             6:  *     @(#)asscan.h    5.1 (Berkeley) 4/30/85
        !             7:  */
        !             8: 
        !             9: /*
        !            10:  *     The character scanner is called to fill up one token buffer
        !            11:  *
        !            12:  *     However, once the tokens are filled up by the
        !            13:  *     character scanner, they are used in both the first and the second
        !            14:  *     pass.  Holes created by .stab removal are replaced
        !            15:  *     with 'skip' tokens that direct the second pass to ignore the
        !            16:  *     following tokens.
        !            17:  */
        !            18: 
        !            19: #define TOKBUFLG               4096
        !            20: #define MAXVAX                 32              
        !            21: #define SAFETY                 16
        !            22: 
        !            23: #define AVAILTOKS              TOKBUFLG -\
        !            24:                sizeof(int) -\
        !            25:                sizeof (struct tokbufdesc *) -\
        !            26:                MAXVAX - SAFETY
        !            27: 
        !            28: struct tokbufdesc{
        !            29:        int             tok_count;              /*absolute byte length*/
        !            30:        struct          tokbufdesc *tok_next;
        !            31:        char            toks[AVAILTOKS];
        !            32:        char            bufovf[MAXVAX + SAFETY];
        !            33: };
        !            34: /*
        !            35:  *     Definitions for handling tokens in the intermediate file
        !            36:  *     buffers.
        !            37:  *
        !            38:  *     We want to have the compiler produce the efficient auto increment
        !            39:  *     instruction for stepping through the buffer of tokens.  We must
        !            40:  *     fool the type checker into thinking that a pointer can point
        !            41:  *     to various size things.
        !            42:  */
        !            43: 
        !            44: typedef int inttoktype;
        !            45: typedef char bytetoktype;
        !            46: 
        !            47: typedef char *ptrall;                  /*all uses will be type cast*/
        !            48: typedef u_short lgtype;                        /*for storing length of strings or skiping*/
        !            49: /*
        !            50:  *     defintions for putting various typed values
        !            51:  *     into the intermediate buffers
        !            52:  *     ptr will ALWAYS be of type ptrall
        !            53:  */
        !            54: 
        !            55: #define        pchar(ptr,val)          *ptr++  = val
        !            56: #define        puchar(ptr,val)         *ptr++  = val
        !            57: 
        !            58: #define        pshort(ptr,val)         *(short *)ptr=val,      ptr += sizeof(short)
        !            59: #define        plgtype(ptr,val)        *(lgtype *)ptr=val,     ptr += sizeof(lgtype)
        !            60: #define        pushort(ptr,val)        *(u_short *)ptr=val,    ptr += sizeof(short)
        !            61: #define        pint(ptr,val)           *(int *)ptr  = val,     ptr += sizeof(int)
        !            62: #define        puint(ptr,val)          *(u_int int *)ptr=val,  ptr += sizeof(int)
        !            63: #define        plong(ptr,val)          *(long *)ptr  = val,    ptr += sizeof(long)
        !            64: #define        pulong(ptr,val)         *(u_int long *)ptr=val, ptr += sizeof(long)
        !            65: #define        pnumber(ptr,val)        *(Bignum*)ptr=val,      ptr += sizeof(Bignum)
        !            66: #define        popcode(ptr,val)        *(struct Opcode*)ptr=val,       ptr += sizeof(struct Opcode)
        !            67: 
        !            68: #define        pptr(ptr,val)           *(int *)ptr  = (val),   ptr += sizeof(ptrall)
        !            69: #define        ptoken(ptr,val)         *ptr++  = val
        !            70: #define        pskiplg(ptr,val)        *(lgtype *)ptr  = val,  ptr += sizeof(short)
        !            71: 
        !            72: #define        gchar(val, ptr)         val = *ptr++
        !            73: #define        guchar(val, ptr)        val = *ptr++
        !            74: 
        !            75: #define        gshort(val, ptr)        val = *(short *)ptr , ptr += sizeof (short)
        !            76: #define        glgtype(val, ptr)       val = *(lgtype *)ptr , ptr += sizeof (lgtype)
        !            77: #define        gushort(val, ptr)       val = *(u_short *)ptr , ptr += sizeof (short)
        !            78: #define        gint(val, ptr)          val = *(int *)ptr, ptr += sizeof (int)
        !            79: #define        guint(val, ptr)         val = *(u_int *)ptr, ptr += sizeof (int)
        !            80: #define        glong(val, ptr)         val = *(long *)ptr, ptr += sizeof (long)
        !            81: #define        gulong(val, ptr)        val = *(u_int *)ptr, ptr += sizeof (long)
        !            82: #define        gnumber(val, ptr)       val = *(Bignum *)ptr, ptr += sizeof(Bignum)
        !            83: #define        gopcode(val, ptr)       val = *(struct Opcode *)ptr, ptr += sizeof(struct Opcode)
        !            84: 
        !            85: #define        gptr(val, ptr)          val = *(int *)ptr, ptr += sizeof (ptrall)
        !            86: #define        gtoken(val, ptr)        val = *ptr++
        !            87: #define        gskiplg(val, ptr)       val = *(lgtype *)ptr, ptr += sizeof (short)
        !            88: 
        !            89: extern ptrall tokptr;  /*the next token to consume, call by copy*/
        !            90: extern ptrall tokub;   /*current upper bound in the current buffer*/

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