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Annotation of 43BSDReno/pgrm/as.tahoe/asscan.h, revision 1.1.1.1

1.1       root        1: /*
                      2:  *     Copyright (c) 1982 Regents of the University of California
                      3:  *     @(#)asscan.h 4.9 6/30/83
                      4:  */
                      5: /*
                      6:  *     The character scanner is called to fill up one token buffer
                      7:  *
                      8:  *     However, once the tokens are filled up by the
                      9:  *     character scanner, they are used in both the first and the second
                     10:  *     pass.  Holes created by .stab removal are replaced
                     11:  *     with 'skip' tokens that direct the second pass to ignore the
                     12:  *     following tokens.
                     13:  */
                     14: 
                     15: #define TOKBUFLG               4096
                     16: #define MAXTAHOE                       32              
                     17: #define SAFETY                 16
                     18: 
                     19: #define AVAILTOKS              TOKBUFLG -\
                     20:                sizeof(int) -\
                     21:                sizeof (struct tokbufdesc *) -\
                     22:                MAXTAHOE - SAFETY
                     23: 
                     24: struct tokbufdesc{
                     25:        int             tok_count;              /*absolute byte length*/
                     26:        struct          tokbufdesc *tok_next;
                     27:        char            toks[AVAILTOKS];
                     28:        char            bufovf[MAXTAHOE + SAFETY];
                     29: };
                     30: /*
                     31:  *     Definitions for handling tokens in the intermediate file
                     32:  *     buffers.
                     33:  *
                     34:  *     We want to have the compiler produce the efficient auto increment
                     35:  *     instruction for stepping through the buffer of tokens.  We must
                     36:  *     fool the type checker into thinking that a pointer can point
                     37:  *     to various size things.
                     38:  */
                     39: 
                     40: typedef int inttoktype;
                     41: /* typedef char inttoktype; */
                     42: typedef char bytetoktype;
                     43: 
                     44: typedef char *ptrall;                  /*all uses will be type cast*/
                     45: typedef u_short lgtype;                        /*for storing length of strings or skiping*/
                     46: /*
                     47:  *     defintions for putting various typed values
                     48:  *     into the intermediate buffers
                     49:  *     ptr will ALWAYS be of type ptrall
                     50:  */
                     51: 
                     52: #define ptype(type, ptr, val)  \
                     53:                (ptr) = (char *)((int)((ptr) + sizeof(type)-1)&~(sizeof(type)-1)), \
                     54:                *(type *)(ptr) = (val), (ptr) += sizeof(type)
                     55: 
                     56: #define        pchar(ptr, val)         *(ptr)++  = (val)
                     57: #define        puchar(ptr, val)        *(ptr)++  = (val)
                     58: 
                     59: #define        pshort(ptr, val)        ptype (short, ptr, val)
                     60: #define        plgtype(ptr, val)       ptype (lgtype, ptr, val)
                     61: #define        pushort(ptr, val)       ptype (u_short, ptr, val)
                     62: #define        pint(ptr, val)          ptype (int, ptr, val)
                     63: #define        puint(ptr, val)         ptype (u_int, ptr, val)
                     64: #define        plong(ptr, val)         ptype (long, ptr, val)
                     65: #define        pulong(ptr, val)        ptype (u_int, ptr, val)
                     66: #define        pnumber(ptr, val)       ptype (Bignum, ptr, val)
                     67: #define        pptr(ptr, val)          ptype (int, ptr, val)
                     68: #define        popcode(ptr, val)       *(ptr)++  = (val)
                     69: #define        ptoken(ptr, val)        *(ptr)++  = (val)
                     70: #define        pskiplg(ptr, val)       ptype (lgtype, ptr, val)
                     71: 
                     72: 
                     73: #define gtype(type, ptr, val)  \
                     74:                (ptr) = (char *)((int)((ptr) + sizeof(type)-1)&~(sizeof(type)-1)), \
                     75:                (val) = *(type *)(ptr)  ,       (ptr) += sizeof(type)
                     76: 
                     77: #define        gchar(val, ptr)         (val) = *(ptr)++
                     78: #define        guchar(val, ptr)        (val) = *(ptr)++
                     79: 
                     80: #define        gshort(val, ptr)        gtype (short, ptr, val)
                     81: #define        glgtype(ptr, val)       gtype (lgtype, ptr, val)
                     82: #define        gushort(val, ptr)       gtype (u_short, ptr, val)
                     83: #define        gint(val, ptr)          gtype (int, ptr, val)
                     84: #define        guint(val, ptr)         gtype (u_int, ptr, val)
                     85: #define        glong(val, ptr)         gtype (long, ptr, val)
                     86: #define        gulong(val, ptr)        gtype (u_int, ptr, val)
                     87: #define        gnumber(val, ptr)       gtype (Bignum, ptr, val)
                     88: #define        gptr(val, ptr)          gtype (int, ptr, val)
                     89: #define        gopcode(val, ptr)       (val) = *(ptr)++
                     90: #define        gtoken(val, ptr)        (val) = *(ptr)++
                     91: #define        gskiplg(val, ptr)       gtype (lgtype, ptr, val)
                     92: 
                     93: 
                     94: extern ptrall tokptr;  /*the next token to consume, call by copy*/
                     95: extern ptrall tokub;   /*current upper bound in the current buffer*/

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