xcomp: shrink scope

It seems that xcomp can't manage to reliably compile core+ units.
Let's limit the role of xcomp to z80c+icore.

I'm getting a little desperate here. I'll revisit the link.fs approach
with a new idea I had...

emul/forth/xcomp.fs

@@ -1,13 +1,3 @@
-: _
-    ['] EXIT ,
-    R> DROP     ( exit : )
-    XCOFF
-; IMMEDIATE
-';' CURRENT @ 4 - C!
-
-: (find) (xfind) ;
-: ['] X['] ; IMMEDIATE
-: COMPILE XCOMPILE ; IMMEDIATE
 : CODE XCODE ;
 : IMMEDIATE XIMM ;
 : : [ ' X: , ] ;

forth/icore.fs

@@ -214,7 +214,7 @@
     R> DROP     ( exit : )
 ; IMMEDIATE
 
-';' XCURRENT @ 4 - C!
+XCURRENT @ ( to PSP )
 
 : :
     (entry)
@@ -231,3 +231,5 @@
     ELSE (parse*) @ EXECUTE LITN THEN
     AGAIN
 ;
+
+( from PSP ) ';' SWAP 4 - C!

forth/xcomp.fs

@@ -1,7 +1,6 @@
-( Do dictionary cross compilation.
+( Allow cross-compilation of z80c and icore.
   Include this file right before your cross compilation, then
-  set XCURRENT to CURRENT and XOFF to H@ - your target hook.
+  set XCURRENT to CURRENT and XOFF to H@.
-  Example: H@ ' _bend - XOFF !
 
   This redefines defining words to achieve cross compilation.
   The goal is two-fold:
@@ -9,11 +8,6 @@
   1. Add an offset to all word references in definitions.
   2. Don't shadow important words we need right now.
 
-  New defining words establish a new XCURRENT, a copy of
-  CURRENT. From now on, CURRENT doesn't move. This means that
-  "'" and friends will *not* find words you're about to
-  define. Only (xfind) will.
-
   Words overrides like ":", "IMMEDIATE" and "CODE" are not
   automatically shadowed to allow the harmless inclusion of
   this unit. This shadowing has to take place in your xcomp
@@ -21,15 +15,8 @@
 
   See example in /emul/forth/xcomp.fs
 
-  Note that this cross compilation unit is far from foolproof
+  Why limit ourselves to icore? Oh, I've tried cross-compiling
-  and cannot cross compile any kind of code. Cross compliation
+  the whole shebang. I tried. And failed. Too dynamic.
-  of Forth dicts is *tricky*. This unit is designed to cross
-  compile the core full interpreter, that is, the contents
-  of the "/forth" folder of the project.
-
-  Cross compiling anything else might work, but as soon as
-  you start defining immediates and using them on-the-fly,
-  things get icky.
 )
 
 VARIABLE XCURRENT
@@ -44,60 +31,26 @@ VARIABLE XOFF
 
 : XIMM XCON IMMEDIATE XCOFF ;
 
-: XAPPLY
-    DUP XOFF @ > IF XOFF @ - THEN
-;
-
-( Run find in XCURRENT and apply XOFF )
-: (xfind)
-    XCURRENT @ SWAP     ( xcur w )
-    _find               ( a f )
-    IF  ( a )
-        ( apply XOFF )
-        XAPPLY 1
-    ELSE
-        0
-    THEN
-;
-
-: X' XCON ' XCOFF XAPPLY ;
-: X['] X' LITN ;
-( TODO: am I making the word "," stable here? )
-: XCOMPILE X' LITN ['] , , ;
-
 : X:
     (xentry)
     ( 0e == compiledWord )
     [ 0x0e LITN ] ,
     BEGIN
-    ( DUP is because we need a copy in case it's IMMED )
+    WORD
-    WORD DUP
     ( cross compile CURRENT )
     XCURRENT @ SWAP     ( w xcur w )
     _find               ( w a f )
     IF
         ( is word )
-        DUP IMMED?
+        ( never supposed to encounter an IMMEDIATE in xdict )
-        IF  ( w a )
+        DUP IMMED? IF ABORT THEN
-            ( When encountering IMMEDIATE, we exec the *host*
-              word. )
-            DROP    ( w )
-            ( system CURRENT )
-            0x02 RAM+ @ SWAP        ( cur w )
-            _find                   ( a f )
-            NOT IF ABORT THEN   ( a )
-            XCON EXECUTE XCOFF
-        ELSE
         ( not an immed. drop backup w and write, with
           offset. )
-            SWAP DROP   ( a )
+        DUP XOFF @ > IF XOFF @ - THEN
-            XAPPLY
         ,
-        THEN
+    ELSE ( w )
-    ELSE ( w a )
         ( not found? it might be an immediate that isn't yet defined in our
           cross-compiled dict. It's alright, we can find-and-execute it. )
-        DROP ( w )
         ( system CURRENT )
         0x02 RAM+ @ SWAP        ( cur w )
         _find                   ( a f )