File:  [gforth] / gforth / Attic / forth.h
Revision 1.6: download - view: text, annotated - select for diffs
Tue May 31 07:25:12 1994 UTC (25 years, 2 months ago) by benschop
Branches: MAIN
CVS tags: HEAD
make sure BIG_ENDIAN is undefined before  machine.h is included.

    1: /*
    2:   $Id: forth.h,v 1.6 1994/05/31 07:25:12 benschop Exp $
    3:   Copyright 1992 by the ANSI figForth Development Group
    4: */
    5: 
    6: /* common header file */
    7: 
    8: typedef void *Label;
    9: 
   10: /* symbol indexed constants */
   11: 
   12: #define DOCOL	0
   13: #define DOCON	1
   14: #define DOVAR	2
   15: #define DOUSER	3
   16: #define DODOES	4
   17: #define DOESJUMP	5
   18: 
   19: /* Some versions of some unices (Linux) have the symbol BIG_ENDIAN defined
   20:    in their standard headers. Make sure it's undefined -- Lennart */
   21: #ifdef BIG_ENDIAN
   22: #undef BIG_ENDIAN
   23: #endif
   24: 
   25: #include "machine.h"
   26: 
   27: /* Forth data types */
   28: typedef int Bool;
   29: #define FLAG(b) (-(b))
   30: #define FILEIO(error)	(FLAG(error) & -37)
   31: #define FILEEXIST(error)	(FLAG(error) & -38)
   32: 
   33: #define F_TRUE (FLAG(0==0))
   34: #define F_FALSE (FLAG(0!=0))
   35: 
   36: typedef unsigned char Char;
   37: typedef double Float;
   38: typedef char *Address;
   39: 
   40: #ifdef DIRECT_THREADED
   41: typedef Label Xt;
   42: #else
   43: typedef Label *Xt;
   44: #endif
   45: 
   46: Label *engine(Xt *ip, Cell *sp, Cell *rp, Float *fp, Address lp);
   47: 
   48: #ifndef DIRECT_THREADED
   49: /* i.e. indirect threaded */
   50: /* the direct threaded version is machine dependent and resides in machine.h */
   51: 
   52: /* PFA gives the parameter field address corresponding to a cfa */
   53: #define PFA(cfa)	(((Cell *)cfa)+2)
   54: /* PFA1 is a special version for use just after a NEXT1 */
   55: #define PFA1(cfa)	PFA(cfa)
   56: /* CODE_ADDRESS is the address of the code jumped to through the code field */
   57: #define CODE_ADDRESS(cfa)	(*(Label *)(cfa))
   58:       /* DOES_CODE is the Forth code does jumps to */
   59: #define DOES_CODE(cfa)           (cfa[1])
   60: #define DOES_CODE1(cfa)          DOES_CODE(cfa)
   61: /* MAKE_CF creates an appropriate code field at the cfa;
   62:    ca is the code address */
   63: #define MAKE_CF(cfa,ca) ((*(Label *)(cfa)) = ((Label)ca))
   64: /* make a code field for a defining-word-defined word */
   65: #define MAKE_DOES_CF(cfa,does_code)	({MAKE_CF(cfa,symbols[DODOES]);	\
   66: 					  ((Cell *)cfa)[1] = (Cell)does_code;})
   67: /* the does handler resides between DOES> and the following Forth code */
   68: #define DOES_HANDLER_SIZE	8
   69: #define MAKE_DOES_HANDLER(addr)	0 /* do nothing */
   70: #endif
   71: 
   72: #ifdef DEBUG
   73: #	define	NAME(string)	printf("%08x: "string"\n",(int)ip);
   74: #else
   75: #	define	NAME(string)
   76: #endif
   77: 
   78: #define CF(const)	(-const-2)
   79: 
   80: #define CF_NIL	-1
   81: 
   82: #ifndef CACHE_FLUSH
   83: #	define CACHE_FLUSH(addr,size)
   84: #endif

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