Annotation of gforth/forth.h, revision 1.2

1.1       anton       1: /*
                      2:   $Id: forth.h,v 1.5 1993/11/06 17:06:54 anton Exp $
                      3:   Copyright 1992 by the ANSI figForth Development Group
                      4: */
                      5: 
                      6: /* common header file */
                      7: 
                      8: typedef void *Label;
                      9: 
1.2     ! pazsan     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: 
1.1       anton      19: #include "machine.h"
                     20: 
                     21: /* Forth data types */
                     22: typedef int Bool;
                     23: #define FLAG(b) (-(b))
                     24: 
                     25: #define F_TRUE (FLAG(0==0))
                     26: #define F_FALSE (FLAG(0!=0))
                     27: 
                     28: typedef unsigned char Char;
                     29: typedef double Float;
                     30: typedef char *Address;
                     31: 
                     32: #ifdef DIRECT_THREADED
                     33: typedef Label Xt;
                     34: #else
                     35: typedef Label *Xt;
                     36: #endif
                     37: 
                     38: Label *engine(Xt *ip, Cell *sp, Cell *rp, Float *fp);
                     39: 
                     40: #ifndef DIRECT_THREADED
                     41: /* i.e. indirect threaded */
                     42: /* the direct threaded version is machine dependent and resides in machine.h */
                     43: 
                     44: /* PFA gives the parameter field address corresponding to a cfa */
                     45: #define PFA(cfa)       (((Cell *)cfa)+2)
                     46: /* PFA1 is a special version for use just after a NEXT1 */
                     47: #define PFA1(cfa)      PFA(cfa)
                     48: /* CODE_ADDRESS is the address of the code jumped to through the code field */
                     49: #define CODE_ADDRESS(cfa)      (*(Label *)(cfa))
                     50:       /* DOES_CODE is the Forth code does jumps to */
                     51: #define DOES_CODE(cfa)           (cfa[1])
                     52: #define DOES_CODE1(cfa)          DOES_CODE(cfa)
                     53: /* MAKE_CF creates an appropriate code field at the cfa;
                     54:    ca is the code address */
                     55: #define MAKE_CF(cfa,ca) ((*(Label *)(cfa)) = ((Label)ca))
                     56: /* make a code field for a defining-word-defined word */
1.2     ! pazsan     57: #define MAKE_DOES_CF(cfa,does_code)    ({MAKE_CF(cfa,symbols[DODOES]); \
1.1       anton      58:                                          ((Cell *)cfa)[1] = (Cell)does_code;})
                     59: /* the does handler resides between DOES> and the following Forth code */
                     60: #define DOES_HANDLER_SIZE      8
                     61: #define MAKE_DOES_HANDLER(addr)        0 /* do nothing */
                     62: #endif
                     63: 
                     64: #ifdef DEBUG
1.2     ! pazsan     65: #      define  NAME(string)    printf("%08x: %s\n",(int)ip,string);
1.1       anton      66: #else
                     67: #      define  NAME(string)
                     68: #endif
1.2     ! pazsan     69: 
        !            70: #define CF(const)      (-const-2)
        !            71: 
        !            72: #define CF_NIL -1

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