File:  [gforth] / gforth / Attic / forth.h
Revision 1.2: download - view: text, annotated - select for diffs
Thu May 5 15:46:44 1994 UTC (25 years, 2 months ago) by pazsan
Branches: MAIN
CVS tags: HEAD
Added direct threading for R3/4000. Still needs cache flush.
Added direct threading for R3/4000. Needs still cache flush.

  $Id: forth.h,v 1.2 1994/05/05 15:46:44 pazsan Exp $
  Copyright 1992 by the ANSI figForth Development Group

/* common header file */

typedef void *Label;

/* symbol indexed constants */

#define DOCOL	0
#define DOCON	1
#define DOVAR	2
#define DOUSER	3
#define DODOES	4
#define DOESJUMP	5

#include "machine.h"

/* Forth data types */
typedef int Bool;
#define FLAG(b) (-(b))

#define F_TRUE (FLAG(0==0))
#define F_FALSE (FLAG(0!=0))

typedef unsigned char Char;
typedef double Float;
typedef char *Address;

typedef Label Xt;
typedef Label *Xt;

Label *engine(Xt *ip, Cell *sp, Cell *rp, Float *fp);

/* i.e. indirect threaded */
/* the direct threaded version is machine dependent and resides in machine.h */

/* PFA gives the parameter field address corresponding to a cfa */
#define PFA(cfa)	(((Cell *)cfa)+2)
/* PFA1 is a special version for use just after a NEXT1 */
#define PFA1(cfa)	PFA(cfa)
/* CODE_ADDRESS is the address of the code jumped to through the code field */
#define CODE_ADDRESS(cfa)	(*(Label *)(cfa))
      /* DOES_CODE is the Forth code does jumps to */
#define DOES_CODE(cfa)           (cfa[1])
#define DOES_CODE1(cfa)          DOES_CODE(cfa)
/* MAKE_CF creates an appropriate code field at the cfa;
   ca is the code address */
#define MAKE_CF(cfa,ca) ((*(Label *)(cfa)) = ((Label)ca))
/* make a code field for a defining-word-defined word */
#define MAKE_DOES_CF(cfa,does_code)	({MAKE_CF(cfa,symbols[DODOES]);	\
					  ((Cell *)cfa)[1] = (Cell)does_code;})
/* the does handler resides between DOES> and the following Forth code */
#define MAKE_DOES_HANDLER(addr)	0 /* do nothing */

#ifdef DEBUG
#	define	NAME(string)	printf("%08x: %s\n",(int)ip,string);
#	define	NAME(string)

#define CF(const)	(-const-2)

#define CF_NIL	-1

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