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