File:  [gforth] / gforth / Attic / forth.h
Revision 1.20: download - view: text, annotated - select for diffs
Thu Nov 9 19:37:02 1995 UTC (27 years, 3 months ago) by pazsan
Branches: MAIN
CVS tags: gforth-0_1beta, HEAD
Made gforth run on Alpha (changed Bool to Cell and worked around

/* common header file

  Copyright (C) 1995 Free Software Foundation, Inc.

  This file is part of Gforth.

  Gforth is free software; you can redistribute it and/or
  modify it under the terms of the GNU General Public License
  as published by the Free Software Foundation; either version 2
  of the License, or (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

typedef void *Label;

/* symbol indexed constants */

#define DOCOL	0
#define DOCON	1
#define DOVAR	2
#define DOUSER	3
#define DODEFER	4
#define DOFIELD	5
#define DODOES	6
#define DOESJUMP	7

#include "machine.h"

/* Forth data types */
typedef Cell Bool;
#define FLAG(b) (-(b))
#define FILEIO(error)	(FLAG(error) & -37)
#define FILEEXIST(error)	(FLAG(error) & -38)

#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, Address lp);

/* 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 DOES_HANDLER_SIZE	(2*sizeof(Cell))
#define MAKE_DOES_HANDLER(addr)	0 /* do nothing */

#ifdef DEBUG
#	define	NAME(string)	fprintf(stderr,"%08lx: "string"\n",(Cell)ip);
#	define	NAME(string)

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

#define CF_NIL	-1

#warning flush-icache probably will not work (see manual)
#	define FLUSH_ICACHE(addr,size)

#define CACHE_FLUSH(addr,size) FLUSH_ICACHE(addr,size)
#define CACHE_FLUSH(addr,size)

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