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Annotation of 42BSD/bin/as/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 MAXVAX                 32              
                     17: #define SAFETY                 16
                     18: 
                     19: #define AVAILTOKS              TOKBUFLG -\
                     20:                sizeof(int) -\
                     21:                sizeof (struct tokbufdesc *) -\
                     22:                MAXVAX - SAFETY
                     23: 
                     24: struct tokbufdesc{
                     25:        int             tok_count;              /*absolute byte length*/
                     26:        struct          tokbufdesc *tok_next;
                     27:        char            toks[AVAILTOKS];
                     28:        char            bufovf[MAXVAX + 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 bytetoktype;
                     42: 
                     43: typedef char *ptrall;                  /*all uses will be type cast*/
                     44: typedef u_short lgtype;                        /*for storing length of strings or skiping*/
                     45: /*
                     46:  *     defintions for putting various typed values
                     47:  *     into the intermediate buffers
                     48:  *     ptr will ALWAYS be of type ptrall
                     49:  */
                     50: 
                     51: #define        pchar(ptr,val)          *ptr++  = val
                     52: #define        puchar(ptr,val)         *ptr++  = val
                     53: 
                     54: #define        pshort(ptr,val)         *(short *)ptr=val,      ptr += sizeof(short)
                     55: #define        plgtype(ptr,val)        *(lgtype *)ptr=val,     ptr += sizeof(lgtype)
                     56: #define        pushort(ptr,val)        *(u_short *)ptr=val,    ptr += sizeof(short)
                     57: #define        pint(ptr,val)           *(int *)ptr  = val,     ptr += sizeof(int)
                     58: #define        puint(ptr,val)          *(u_int int *)ptr=val,  ptr += sizeof(int)
                     59: #define        plong(ptr,val)          *(long *)ptr  = val,    ptr += sizeof(long)
                     60: #define        pulong(ptr,val)         *(u_int long *)ptr=val, ptr += sizeof(long)
                     61: #define        pnumber(ptr,val)        *(Bignum*)ptr=val,      ptr += sizeof(Bignum)
                     62: #define        popcode(ptr,val)        *(struct Opcode*)ptr=val,       ptr += sizeof(struct Opcode)
                     63: 
                     64: #define        pptr(ptr,val)           *(int *)ptr  = (val),   ptr += sizeof(ptrall)
                     65: #define        ptoken(ptr,val)         *ptr++  = val
                     66: #define        pskiplg(ptr,val)        *(lgtype *)ptr  = val,  ptr += sizeof(short)
                     67: 
                     68: #define        gchar(val, ptr)         val = *ptr++
                     69: #define        guchar(val, ptr)        val = *ptr++
                     70: 
                     71: #define        gshort(val, ptr)        val = *(short *)ptr , ptr += sizeof (short)
                     72: #define        glgtype(val, ptr)       val = *(lgtype *)ptr , ptr += sizeof (lgtype)
                     73: #define        gushort(val, ptr)       val = *(u_short *)ptr , ptr += sizeof (short)
                     74: #define        gint(val, ptr)          val = *(int *)ptr, ptr += sizeof (int)
                     75: #define        guint(val, ptr)         val = *(u_int *)ptr, ptr += sizeof (int)
                     76: #define        glong(val, ptr)         val = *(long *)ptr, ptr += sizeof (long)
                     77: #define        gulong(val, ptr)        val = *(u_int *)ptr, ptr += sizeof (long)
                     78: #define        gnumber(val, ptr)       val = *(Bignum *)ptr, ptr += sizeof(Bignum)
                     79: #define        gopcode(val, ptr)       val = *(struct Opcode *)ptr, ptr += sizeof(struct Opcode)
                     80: 
                     81: #define        gptr(val, ptr)          val = *(int *)ptr, ptr += sizeof (ptrall)
                     82: #define        gtoken(val, ptr)        val = *ptr++
                     83: #define        gskiplg(val, ptr)       val = *(lgtype *)ptr, ptr += sizeof (short)
                     84: 
                     85: extern ptrall tokptr;  /*the next token to consume, call by copy*/
                     86: extern ptrall tokub;   /*current upper bound in the current buffer*/

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