usr/src/old/as.vax/asscan.h

/*
 * Copyright (c) 1982 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 *
 *      @(#)asscan.h    5.1 (Berkeley) %G%
 */

/*
 *      The character scanner is called to fill up one token buffer
 *
 *      However, once the tokens are filled up by the
 *      character scanner, they are used in both the first and the second
 *      pass.  Holes created by .stab removal are replaced
 *      with 'skip' tokens that direct the second pass to ignore the
 *      following tokens.
 */

#define TOKBUFLG                4096
#define MAXVAX                  32
#define SAFETY                  16

#define AVAILTOKS               TOKBUFLG -\
                sizeof(int) -\
                sizeof (struct tokbufdesc *) -\
                MAXVAX - SAFETY

struct tokbufdesc{
        int             tok_count;              /*absolute byte length*/
        struct          tokbufdesc *tok_next;
        char            toks[AVAILTOKS];
        char            bufovf[MAXVAX + SAFETY];
};
/*
 *      Definitions for handling tokens in the intermediate file
 *      buffers.
 *
 *      We want to have the compiler produce the efficient auto increment
 *      instruction for stepping through the buffer of tokens.  We must
 *      fool the type checker into thinking that a pointer can point
 *      to various size things.
 */

typedef int inttoktype;
typedef char bytetoktype;

typedef char *ptrall;                   /*all uses will be type cast*/
typedef u_short lgtype;                 /*for storing length of strings or skiping*/
/*
 *      defintions for putting various typed values
 *      into the intermediate buffers
 *      ptr will ALWAYS be of type ptrall
 */

#define pchar(ptr,val)          *ptr++  = val
#define puchar(ptr,val)         *ptr++  = val

#define pshort(ptr,val)         *(short *)ptr=val,      ptr += sizeof(short)
#define plgtype(ptr,val)        *(lgtype *)ptr=val,     ptr += sizeof(lgtype)
#define pushort(ptr,val)        *(u_short *)ptr=val,    ptr += sizeof(short)
#define pint(ptr,val)           *(int *)ptr  = val,     ptr += sizeof(int)
#define puint(ptr,val)          *(u_int int *)ptr=val,  ptr += sizeof(int)
#define plong(ptr,val)          *(long *)ptr  = val,    ptr += sizeof(long)
#define pulong(ptr,val)         *(u_int long *)ptr=val, ptr += sizeof(long)
#define pnumber(ptr,val)        *(Bignum*)ptr=val,      ptr += sizeof(Bignum)
#define popcode(ptr,val)        *(struct Opcode*)ptr=val,       ptr += sizeof(struct Opcode)

#define pptr(ptr,val)           *(int *)ptr  = (val),   ptr += sizeof(ptrall)
#define ptoken(ptr,val)         *ptr++  = val
#define pskiplg(ptr,val)        *(lgtype *)ptr  = val,  ptr += sizeof(short)

#define gchar(val, ptr)         val = *ptr++
#define guchar(val, ptr)        val = *ptr++

#define gshort(val, ptr)        val = *(short *)ptr , ptr += sizeof (short)
#define glgtype(val, ptr)       val = *(lgtype *)ptr , ptr += sizeof (lgtype)
#define gushort(val, ptr)       val = *(u_short *)ptr , ptr += sizeof (short)
#define gint(val, ptr)          val = *(int *)ptr, ptr += sizeof (int)
#define guint(val, ptr)         val = *(u_int *)ptr, ptr += sizeof (int)
#define glong(val, ptr)         val = *(long *)ptr, ptr += sizeof (long)
#define gulong(val, ptr)        val = *(u_int *)ptr, ptr += sizeof (long)
#define gnumber(val, ptr)       val = *(Bignum *)ptr, ptr += sizeof(Bignum)
#define gopcode(val, ptr)       val = *(struct Opcode *)ptr, ptr += sizeof(struct Opcode)

#define gptr(val, ptr)          val = *(int *)ptr, ptr += sizeof (ptrall)
#define gtoken(val, ptr)        val = *ptr++
#define gskiplg(val, ptr)       val = *(lgtype *)ptr, ptr += sizeof (short)

extern  ptrall tokptr;  /*the next token to consume, call by copy*/
extern  ptrall tokub;   /*current upper bound in the current buffer*/