forth: Forth-ify "HERE", "CURRENT" and "JTBL"

forth/forth.asm

@@ -131,6 +131,8 @@ LIT:
 	.dw	FLAGS
 ; 46
 	.dw	PARSEPTR
+	.dw	HERE
+	.dw	CURRENT
 
 ; *** Code ***
 forthMain:
@@ -161,7 +163,7 @@ forthMain:
 .bootName:
 	.db	"BOOT", 0
 
-.fill 105
+.fill 101
 
 ; STABLE ABI
 ; Offset: 00cd
@@ -784,36 +786,10 @@ PARSED:
 	jp	next
 
 
-.fill 96
-
-	.db	"JTBL"
-	.dw	$-PARSED
-	.db	4
-JTBL:
-	.dw	sysvarWord
-	.dw	JUMPTBL
-
-; STABLE ABI (every sysvars)
-; Offset: 05ca
-.out $
-	.db "HERE"
-	.dw $-JTBL
-	.db 4
-HERE_:	; Caution: conflicts with actual variable name
-	.dw sysvarWord
-	.dw HERE
-
-	.db "CURRENT"
-	.dw $-HERE_
-	.db 7
-CURRENT_:
-	.dw sysvarWord
-	.dw CURRENT
-
-.fill 92
+.fill 224
 
 	.db	"_bend"
-	.dw	$-CURRENT_
+	.dw	$-PARSED
 	.db	5
 ; Offset: 0647
 .out $

forth/icore.fs

@@ -55,6 +55,8 @@
     ,           ( write! )
 ; IMMEDIATE
 
+: JTBL 0x08 ;
+
 : FLAGS
     ( JTBL+44 == FLAGS )
     [ JTBL 44 + @ LITN ]
@@ -65,6 +67,16 @@
     [ JTBL 46 + @ LITN ]
 ;
 
+: HERE
+    ( JTBL+48 == HERE )
+    [ JTBL 48 + @ LITN ]
+;
+
+: CURRENT
+    ( JTBL+50 == CURRENT )
+    [ JTBL 50 + @ LITN ]
+;
+
 : QUIT
     0 _c FLAGS _c ! _c (resRS)
     LIT< INTERPRET (find) _c DROP EXECUTE
@@ -100,8 +112,8 @@
 ;
 
 : C,
-    HERE _c @ _c C!
-    HERE _c @ 1 _c + HERE _c !
+    _c HERE _c @ _c C!
+    _c HERE _c @ 1 _c + _c HERE _c !
 ;
 
 ( The NOT is to normalize the negative/positive numbers to 1
@@ -136,18 +148,18 @@
 ;
 
 : (entry)
-    HERE _c @       ( h )
+    _c HERE _c @       ( h )
     _c WORD         ( h s )
     SCPY            ( h )
     ( Adjust HERE -1 because SCPY copies the null )
-    HERE _c @ 1 _c - ( h h' )
-    _c DUP HERE _c ! ( h h' )
+    _c HERE _c @ 1 _c - ( h h' )
+    _c DUP _c HERE _c ! ( h h' )
     _c SWAP _c -       ( sz )
     ( write prev value )
-    HERE _c @ CURRENT _c @ _c - ,
+    _c HERE _c @ _c CURRENT _c @ _c - ,
     ( write size )
     _c C,
-    HERE _c @ CURRENT _c !
+    _c HERE _c @ _c CURRENT _c !
 ;
 
 : INTERPRET
@@ -177,7 +189,7 @@
   it to avoid bootstrapping issues )
 : LITN
     ( JTBL+24 == NUMBER )
-    JTBL 24 _c + ,
+    _c JTBL 24 _c + ,
     ,
 ;