--- gforth/prims2x.fs	1999/03/09 17:19:40	1.40
+++ gforth/prims2x.fs	2000/12/13 10:15:26	1.54
@@ -1,6 +1,6 @@
 \ converts primitives to, e.g., C code 
 
-\ Copyright (C) 1995,1996,1997,1998 Free Software Foundation, Inc.
+\ Copyright (C) 1995,1996,1997,1998,2000 Free Software Foundation, Inc.
 
 \ This file is part of Gforth.
 
@@ -16,7 +16,7 @@
 
 \ You should have received a copy of the GNU General Public License
 \ along with this program; if not, write to the Free Software
-\ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+\ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
 
 
 \ This is not very nice (hard limits, no checking, assumes 1 chars = 1)
@@ -54,6 +54,8 @@ include ./extend.fs
 include ./environ.fs
 [THEN]
 
+: struct% struct ; \ struct is redefined in gray
+
 include ./gray.fs
 
 100 constant max-effect \ number of things on one side of a stack effect
@@ -62,11 +64,6 @@ maxchar 1+ constant eof-char
 #tab constant tab-char
 #lf constant nl-char
 
-: read-whole-file ( c-addr1 file-id -- c-addr2 )
-\ reads the contents of the file file-id puts it into memory at c-addr1
-\ c-addr2 is the first address after the file block
-  >r dup $7fffffff r> read-file throw + ;
-
 variable rawinput \ pointer to next character to be scanned
 variable endrawinput \ pointer to the end of the input (the char after the last)
 variable cookedinput \ pointer to the next char to be parsed
@@ -79,27 +76,6 @@ variable line \ line number of char poin
 variable skipsynclines \ are sync lines ("#line ...") invisible to the parser?
 skipsynclines on 
 
-Variable flush-comment flush-comment off
-
-: ?flush-comment
-    flush-comment @ 0= ?EXIT
-    f-comment 2@ nip
-    IF  cr f-comment 2@ 2 /string 1-
-	dup IF
-	    2dup s" -" compare 0=
-	    IF
-		flush-comment @ 1 =
-		IF    ." #else"
-		ELSE  ." [ELSE]"  THEN
-	    ELSE
-		flush-comment @ 1 =
-		IF    ." #ifdef HAS_" bounds ?DO  I c@ toupper emit  LOOP
-		ELSE  ." has? " type ."  [IF]"  THEN
-	    THEN  cr
-	ELSE    flush-comment @ 1 = IF  ." #endif"  ELSE  ." [THEN]"  THEN
-	    cr  THEN
-	0 0 f-comment 2! THEN ;
-
 : start ( -- addr )
  cookedinput @ ;
 
@@ -111,22 +87,57 @@ variable output \ xt ( -- ) of output wo
 : printprim ( -- )
  output @ execute ;
 
-: field
- <builds-field ( n1 n2 -- n3 )
- does>         ( addr1 -- addr2 )
-   @ + ;
-
-: const-field
- <builds-field ( n1 n2 -- n3 )
- does>         ( addr -- w )
-   @ + @ ;
-
-struct
- 2 cells field item-name
- cell field item-d-offset
- cell field item-f-offset
- cell field item-type
-constant item-descr
+struct%
+    cell% 2* field stack-pointer \ stackpointer name
+    cell% 2* field stack-cast \ cast string for assignments to stack elements
+    cell%    field stack-in-index-xt \ ( in-size item -- in-index )
+    cell%    field stack-in  \ number of stack items in effect in
+    cell%    field stack-out \ number of stack items in effect out
+end-struct stack%
+
+struct%
+ cell% 2* field item-name   \ name, excluding stack prefixes
+ cell%    field item-stack  \ descriptor for the stack used, 0 is default
+ cell%    field item-type   \ descriptor for the item type
+ cell%    field item-offset \ offset in stack items, 0 for the deepest element
+end-struct item%
+
+struct%
+    cell% 2* field type-c-name
+    cell%    field type-stack \ default stack
+    cell%    field type-size  \ size of type in stack items
+    cell%    field type-fetch \ xt of fetch code generator ( item -- )
+    cell%    field type-store \ xt of store code generator ( item -- )
+end-struct type%
+
+: stack-in-index ( in-size item -- in-index )
+    item-offset @ - 1- ;
+
+: inst-in-index ( in-size item -- in-index )
+    nip dup item-offset @ swap item-type @ type-size @ + 1- ;
+
+: make-stack ( addr-ptr u1 addr-cast u2 "stack-name" -- )
+    create stack% %allot >r
+    save-mem r@ stack-cast 2!
+    save-mem r@ stack-pointer 2! 
+    ['] stack-in-index r> stack-in-index-xt ! ;
+
+s" sp" save-mem s" (Cell)" make-stack data-stack 
+s" fp" save-mem s" "       make-stack fp-stack
+s" rp" save-mem s" (Cell)" make-stack return-stack
+s" ip" save-mem s" error don't use # on results" make-stack inst-stream
+' inst-in-index inst-stream stack-in-index-xt !
+\ !! initialize stack-in and stack-out
+
+\ stack items
+
+: init-item ( addr u addr1 -- )
+    \ initialize item at addr1 with name addr u
+    \ !! remove stack prefix
+    dup item% %size erase
+    item-name 2! ;
+
+\ various variables for storing stuff of one primitive
 
 2variable forth-name
 2variable wordset
@@ -135,12 +146,10 @@ constant item-descr
 2variable c-code
 2variable forth-code
 2variable stack-string
-create effect-in  max-effect item-descr * allot
-create effect-out max-effect item-descr * allot
+create effect-in  max-effect item% %size * allot
+create effect-out max-effect item% %size * allot
 variable effect-in-end ( pointer )
 variable effect-out-end ( pointer )
-2variable effect-in-size
-2variable effect-out-size
 variable c-line
 2variable c-filename
 variable name-line
@@ -240,48 +249,88 @@ print-token !
 
 char a char z ..  char A char Z ..  union char _ singleton union  charclass letter
 char 0 char 9 ..					charclass digit
-bl singleton						charclass blank
-tab-char singleton					charclass tab
+bl singleton tab-char over add-member			charclass white
 nl-char singleton eof-char over add-member complement	charclass nonl
-nl-char singleton eof-char over add-member char : over add-member complement  charclass nocolonnl
-bl 1+ maxchar ..					charclass nowhite
+nl-char singleton eof-char over add-member
+    char : over add-member complement                   charclass nocolonnl
+bl 1+ maxchar .. char \ singleton complement intersection
+                                                        charclass nowhitebq
+bl 1+ maxchar ..                                        charclass nowhite
 char " singleton eof-char over add-member complement	charclass noquote
 nl-char singleton					charclass nl
 eof-char singleton					charclass eof
 
 
 (( letter (( letter || digit )) **
-)) <- c-name ( -- )
+)) <- c-ident ( -- )
 
-nowhite ++
-<- name ( -- )
+(( ` # ?? (( letter || digit || ` : )) **
+)) <- stack-ident ( -- )
 
-(( {{ ?flush-comment start }} ` \ nonl ** nl {{ end
-      2dup 2 min s" \+" compare 0= IF  f-comment 2!  ELSE  2drop  THEN }}
-)) <- comment ( -- )
-
-(( {{ effect-in }} (( {{ start }} c-name {{ end 2 pick item-name 2! item-descr + }} blank ** )) ** {{ effect-in-end ! }}
-   ` - ` - blank **
-   {{ effect-out }} (( {{ start }} c-name {{ end 2 pick item-name 2! item-descr + }} blank ** )) ** {{ effect-out-end ! }}
+(( nowhitebq nowhite ** ))
+<- forth-ident ( -- )
+
+Variable forth-flag
+Variable c-flag
+
+(( (( ` e || ` E )) {{ start }} nonl ** 
+   {{ end evaluate }}
+)) <- eval-comment ( ... -- ... )
+
+(( (( ` f || ` F )) {{ start }} nonl ** 
+   {{ end forth-flag @ IF type cr ELSE 2drop THEN }}
+)) <- forth-comment ( -- )
+
+(( (( ` c || ` C )) {{ start }} nonl ** 
+   {{ end c-flag @ IF type cr ELSE 2drop THEN }}
+)) <- c-comment ( -- )
+
+(( ` - nonl ** {{ 
+	forth-flag @ IF ." [ELSE]" cr THEN
+	c-flag @ IF ." #else" cr THEN }}
+)) <- else-comment
+
+(( ` + {{ start }} nonl ** {{ end
+	dup
+	IF	c-flag @
+		IF    ." #ifdef HAS_" bounds ?DO  I c@ toupper emit  LOOP cr
+		THEN
+		forth-flag @
+		IF  ." has? " type ."  [IF]"  cr THEN
+	ELSE	2drop
+	    c-flag @      IF  ." #endif"  cr THEN
+	    forth-flag @  IF  ." [THEN]"  cr THEN
+	THEN }}
+)) <- if-comment
+
+(( (( eval-comment || forth-comment || c-comment || else-comment || if-comment )) ?? nonl ** )) <- comment-body
+
+(( ` \ comment-body nl )) <- comment ( -- )
+
+(( {{ start }} stack-ident {{ end 2 pick init-item item% %size + }} white ** )) **
+<- stack-items
+
+(( {{ effect-in }}  stack-items {{ effect-in-end ! }}
+   ` - ` - white **
+   {{ effect-out }} stack-items {{ effect-out-end ! }}
 )) <- stack-effect ( -- )
 
 (( {{ s" " doc 2! s" " forth-code 2! }}
-   (( comment || nl )) **
    (( {{ line @ name-line ! filename 2@ name-filename 2! }}
-      {{ start }} name {{ end 2dup forth-name 2! c-name 2! }}  tab ++
-      {{ start }} stack-effect {{ end stack-string 2! }} tab ++
-        {{ start }} name {{ end wordset 2! }} tab **
-        (( {{ start }}  c-name {{ end c-name 2! }} )) ??  nl
+      {{ start }} forth-ident {{ end 2dup forth-name 2! c-name 2! }}  white ++
+      ` ( white ** {{ start }} stack-effect {{ end stack-string 2! }} ` ) white **
+        {{ start }} forth-ident {{ end wordset 2! }} white **
+        (( {{ start }}  c-ident {{ end c-name 2! }} )) ??  nl
    ))
    (( ` " ` "  {{ start }} (( noquote ++ ` " )) ++ {{ end 1- doc 2! }} ` " nl )) ??
    {{ skipsynclines off line @ c-line ! filename 2@ c-filename 2! start }} (( nocolonnl nonl **  nl )) ** {{ end c-code 2! skipsynclines on }}
    (( ` :  nl
       {{ start }} (( nonl ++  nl )) ++ {{ end forth-code 2! }}
-   )) ??
+   )) ?? {{ printprim }}
    (( nl || eof ))
 )) <- primitive ( -- )
 
-(( (( primitive {{ printprim }} )) ** eof ))
+(( (( comment || primitive || nl )) ** eof ))
 parser primitives2something
 warnings @ [IF]
 .( parser generated ok ) cr
@@ -291,9 +340,9 @@ warnings @ [IF]
 \ fileid is for the input file, xt ( -- ) is for the output word
  output !
  here dup rawinput ! cookedinput !
- here swap read-whole-file
- dup endrawinput !
- here - allot
+ here unused rot read-file throw
+ dup here + endrawinput !
+ allot
  align
  checksyncline
 \ begin
@@ -303,59 +352,43 @@ warnings @ [IF]
 
 \ types
 
-struct
- 2 cells field type-c-name
- cell const-field type-d-size
- cell const-field type-f-size
- cell const-field type-fetch-handler
- cell const-field type-store-handler
-constant type-description
-
-: data-stack-access ( n1 n2 n3 -- )
-\ n1 is the offset of the accessed item, n2, n3 are effect-*-size
- drop swap - 1- dup
- if
-   ." sp[" 0 .r ." ]"
- else
-   drop ." TOS"
- endif ;
+: stack-access ( n stack -- )
+    \ print a stack access at index n of stack
+    stack-pointer 2@ type
+    dup
+    if
+	." [" 0 .r ." ]"
+    else
+	drop ." TOS"
+    endif ;
 
-: fp-stack-access ( n1 n2 n3 -- )
-\ n1 is the offset of the accessed item, n2, n3 are effect-*-size
- nip swap - 1- dup
- if
-   ." fp[" 0 .r ." ]"
- else
-   drop ." FTOS"
- endif ;
+: item-in-index { item -- n }
+    \ n is the index of item (in the in-effect)
+    item item-stack @ dup >r stack-in @ ( in-size r:stack )
+    item r> stack-in-index-xt @ execute ;
 
 : fetch-single ( item -- )
+ \ fetch a single stack item from its stack
  >r
  r@ item-name 2@ type
  ."  = (" 
  r@ item-type @ type-c-name 2@ type ." ) "
- r@ item-d-offset @ effect-in-size 2@ data-stack-access ." ;" cr
+ r@ item-in-index r@ item-stack @ stack-access
+ ." ;" cr
  rdrop ; 
 
 : fetch-double ( item -- )
+ \ fetch a double stack item from its stack
  >r
  ." FETCH_DCELL("
  r@ item-name 2@ type ." , "
- r@ item-d-offset @ dup    effect-in-size 2@ data-stack-access
- ." , "			1+ effect-in-size 2@ data-stack-access
+ r@ item-in-index r@ item-stack @ 2dup stack-access
+ ." , "                      -1 under+ stack-access
  ." );" cr
  rdrop ;
 
-: fetch-float ( item -- )
- >r
- r@ item-name 2@ type
- ."  = "
- \ ." (" r@ item-type @ type-c-name 2@ type ." ) "
- r@ item-f-offset @ effect-in-size 2@ fp-stack-access ." ;" cr
- rdrop ;
-
-: d-same-as-in? ( item -- f )
-\ f is true iff the offset of item is the same as on input
+: same-as-in? ( item -- f )
+ \ f is true iff the offset and stack of item is the same as on input
  >r
  r@ item-name 2@ items @ search-wordlist 0=
  abort" bug"
@@ -364,31 +397,30 @@ constant type-description
  if \ item first appeared in output
    drop false
  else
-   item-d-offset @ r@ item-d-offset @ =
+   dup  item-stack  @ r@ item-stack  @ = 
+   swap item-offset @ r@ item-offset @ = and
  endif
  rdrop ;
 
-: is-in-tos? ( item -- f )
-\ true if item has the same offset as the input TOS
- item-d-offset @ 1+ effect-in-size 2@ drop = ;
-
-: is-out-tos? ( item -- f )
-\ true if item has the same offset as the input TOS
- item-d-offset @ 1+ effect-out-size 2@ drop = ;
+: item-out-index ( item -- n )
+    \ n is the index of item (in the in-effect)
+    >r r@ item-stack @ stack-out @ r> item-offset @ - 1- ;
 
 : really-store-single ( item -- )
  >r
- r@ item-d-offset @ effect-out-size 2@ data-stack-access ."  = (Cell)"
+ r@ item-out-index r@ item-stack @ stack-access ."  = "
+ r@ item-stack @ stack-cast 2@ type
  r@ item-name 2@ type ." ;"
  rdrop ;
 
 : store-single ( item -- )
  >r
- r@ d-same-as-in?
+ r@ same-as-in?
  if
-   r@ is-in-tos? r@ is-out-tos? xor
+   r@ item-in-index 0= r@ item-out-index 0= xor
    if
-     ." IF_TOS(" r@ really-store-single ." );" cr
+       ." IF_" r@ item-stack @ stack-pointer 2@ type
+       ." TOS(" r@ really-store-single ." );" cr
    endif
  else
    r@ really-store-single cr
@@ -399,131 +431,88 @@ constant type-description
 \ !! store optimization is not performed, because it is not yet needed
  >r
  ." STORE_DCELL(" r@ item-name 2@ type ." , "
- r@ item-d-offset @ dup    effect-out-size 2@ data-stack-access
- ." , "			1+ effect-out-size 2@ data-stack-access
+ r@ item-out-index r@ item-stack @ 2dup stack-access
+ ." , "                       -1 under+ stack-access
  ." );" cr
  rdrop ;
 
-: f-same-as-in? ( item -- f )
-\ f is true iff the offset of item is the same as on input
- >r
- r@ item-name 2@ items @ search-wordlist 0=
- abort" bug"
- execute @
- dup r@ =
- if \ item first appeared in output
-   drop false
- else
-   item-f-offset @ r@ item-f-offset @ =
- endif
- rdrop ;
-
-: is-in-ftos? ( item -- f )
-\ true if item has the same offset as the input TOS
- item-f-offset @ 1+ effect-in-size 2@ nip = ;
-
-: really-store-float ( item -- )
- >r
- r@ item-f-offset @ effect-out-size 2@ fp-stack-access ."  = "
- r@ item-name 2@ type ." ;"
- rdrop ;
-
-: store-float ( item -- )
- >r
- r@ f-same-as-in?
- if
-   r@ is-in-ftos?
-   if
-     ." IF_FTOS(" r@ really-store-float ." );" cr
-   endif
- else
-   r@ really-store-float cr
- endif
- rdrop ;
- 
-: single-type ( -- xt1 xt2 n1 n2 )
- ['] fetch-single ['] store-single 1 0 ;
-
-: double-type ( -- xt1 xt2 n1 n2 )
- ['] fetch-double ['] store-double 2 0 ;
+: single ( -- xt1 xt2 n )
+    ['] fetch-single ['] store-single 1 ;
 
-: float-type ( -- xt1 xt2 n1 n2 )
- ['] fetch-float ['] store-float 0 1 ;
+: double ( -- xt1 xt2 n )
+    ['] fetch-double ['] store-double 2 ;
 
 : s, ( addr u -- )
 \ allocate a string
  here swap dup allot move ;
 
-: starts-with ( addr u xt1 xt2 n1 n2 "prefix" -- )
-\ describes a type
-\ addr u specifies the C type name
-\ n1 is the size of the type on the data stack
-\ n2 is the size of the type on the FP stack
-\ stack effect entries of the type start with prefix
- >r >r >r >r
- dup >r here >r s,
- create
- r> r> 2,
- r> r> r> , r> , swap , , ;
-
-wordlist constant types
-get-current
-types set-current
-
-s" Bool"	single-type starts-with f
-s" Char"	single-type starts-with c
-s" Cell"	single-type starts-with n
-s" Cell"	single-type starts-with w
-s" UCell"	single-type starts-with u
-s" DCell"	double-type starts-with d
-s" UDCell"	double-type starts-with ud
-s" Float"	float-type  starts-with r
-s" Cell *"	single-type starts-with a_
-s" Char *"	single-type starts-with c_
-s" Float *"	single-type starts-with f_
-s" DFloat *"	single-type starts-with df_
-s" SFloat *"	single-type starts-with sf_
-s" Xt"		single-type starts-with xt
-s" WID"		single-type starts-with wid
-s" struct F83Name *"	single-type starts-with f83name
-
-set-current
-
-: get-type ( addr1 u1 -- type-descr )
-\ get the type of the name in addr1 u1
-\ type-descr is a pointer to a type-descriptor
- 0 swap ?do
-   dup i types search-wordlist
-   if \ ok, we have the type ( addr1 xt )
-     execute nip
-     UNLOOP EXIT
-   endif
- -1 s+loop
- \ we did not find a type, abort
- true abort" unknown type prefix" ;
+wordlist constant prefixes
 
 : declare ( addr "name" -- )
 \ remember that there is a stack item at addr called name
  create , ;
 
+: !default ( w addr -- )
+    dup @ if
+	2drop \ leave nonzero alone
+    else
+	!
+    endif ;
+
+: create-type { addr u xt1 xt2 n stack -- } ( "prefix" -- )
+    \ describes a type
+    \ addr u specifies the C type name
+    \ stack effect entries of the type start with prefix
+    create type% %allot >r
+    addr u save-mem r@ type-c-name 2!
+    xt1   r@ type-fetch !
+    xt2   r@ type-store !
+    n     r@ type-size !
+    stack r@ type-stack !
+    rdrop ;
+
+: type-prefix ( xt1 xt2 n stack "prefix" -- )
+    create-type
+does> ( item -- )
+    \ initialize item
+    { item typ }
+    typ item item-type !
+    typ type-stack @ item item-stack !default
+    item item-name 2@ items @ search-wordlist 0= if \ new name
+	item item-name 2@ 2dup nextname item declare
+	typ type-c-name 2@ type space type  ." ;" cr
+    else
+	drop
+    endif ;
+
+: execute-prefix ( item addr1 u1 -- )
+    \ execute the word ( item -- ) associated with the longest prefix
+    \ of addr1 u1
+    0 swap ?do
+	dup i prefixes search-wordlist
+	if \ ok, we have the type ( item addr1 xt )
+	    nip execute
+	    UNLOOP EXIT
+	endif
+	-1 s+loop
+    \ we did not find a type, abort
+    true abort" unknown prefix" ;
+
 : declaration ( item -- )
- dup item-name 2@ items @ search-wordlist
- if \ already declared ( item xt )
-   execute @ item-type @ swap item-type !
- else ( addr )
-   dup item-name 2@ nextname dup declare ( addr )
-   dup >r item-name 2@ 2dup get-type ( addr1 u type-descr )
-   dup r> item-type ! ( addr1 u type-descr )
-   type-c-name 2@ type space type ." ;" cr
- endif ;
+    dup item-name 2@ execute-prefix ;
 
+: stack-prefix ( stack "prefix" -- )
+    name tuck nextname create ( stack length ) 2,
+does> ( item -- )
+    2@ { item stack prefix-length }
+    item item-name 2@ prefix-length /string item item-name 2!
+    stack item item-stack !
+    item declaration ;
+    
 : declaration-list ( addr1 addr2 -- )
  swap ?do
   i declaration
- item-descr +loop ;
-
-: fetch ( addr -- )
- dup item-type @ type-fetch-handler execute ;
+ item% %size +loop ;
 
 : declarations ( -- )
  wordlist dup items ! set-current
@@ -534,80 +523,105 @@ set-current
 \ the leftmost (i.e. deepest) item has offset 0
 \ the rightmost item has the highest offset
 
-: compute-offset ( n1 n2 item -- n3 n4 )
-\ n1, n3 are data-stack-offsets
-\ n2, n4 are the fp-stack-offsets
- >r
- swap dup r@ item-d-offset !
- r@ item-type @ type-d-size +
- swap dup r@ item-f-offset !
- r@ item-type @ type-f-size +
- rdrop ;
+: compute-offset { item xt -- }
+    \ xt specifies in/out; update stack-in/out and set item-offset
+    item item-type @ type-size @
+    item item-stack @ xt execute dup @ >r +!
+    r> item item-offset ! ;
+
+: compute-list ( addr1 addr2 xt -- )
+    { xt }
+    swap u+do
+	i xt compute-offset
+    item% %size +loop ;
 
-: compute-list ( addr1 addr2 -- n1 n2 )
-\ n1, n2 are the final offsets
- 0 0 2swap swap ?do
-  i compute-offset
- item-descr +loop ;
+: clear-stack { -- }
+    dup stack-in off stack-out off ;
 
 : compute-offsets ( -- )
- effect-in effect-in-end @ compute-list effect-in-size 2!
- effect-out effect-out-end @ compute-list effect-out-size 2! ;
+    data-stack clear-stack  fp-stack clear-stack return-stack clear-stack
+    inst-stream clear-stack
+    effect-in  effect-in-end  @ ['] stack-in  compute-list
+    effect-out effect-out-end @ ['] stack-out compute-list
+    inst-stream stack-out @ 0<> abort" # can only be on the input side" ;
+
+: flush-a-tos { stack -- }
+    stack stack-out @ 0<> stack stack-in @ 0= and
+    if
+	." IF_" stack stack-pointer 2@ 2dup type ." TOS("
+	2dup type ." [0] = " type ." TOS);" cr
+    endif ;
 
 : flush-tos ( -- )
- effect-in-size 2@ effect-out-size 2@
- 0<> rot 0= and
- if
-   ." IF_FTOS(fp[0] = FTOS);" cr
- endif
- 0<> swap 0= and
- if
-   ." IF_TOS(sp[0] = TOS);" cr
- endif ;
+    data-stack   flush-a-tos
+    fp-stack     flush-a-tos
+    return-stack flush-a-tos ;
+
+: fill-a-tos { stack -- }
+    stack stack-out @ 0= stack stack-in @ 0<> and
+    if
+	." IF_" stack stack-pointer 2@ 2dup type ." TOS("
+	2dup type ." TOS = " type ." [0]);" cr
+    endif ;
 
 : fill-tos ( -- )
- effect-in-size 2@ effect-out-size 2@
- 0= rot 0<> and
- if
-   ." IF_FTOS(FTOS = fp[0]);" cr
- endif
- 0= swap 0<> and
- if
-   ." IF_TOS(TOS = sp[0]);" cr
- endif ;
+    \ !! inst-stream for prefetching?
+    fp-stack     fill-a-tos
+    data-stack   fill-a-tos
+    return-stack fill-a-tos ;
+
+: fetch ( addr -- )
+ dup item-type @ type-fetch @ execute ;
 
 : fetches ( -- )
  effect-in-end @ effect-in ?do
    i fetch
- item-descr +loop ; 
+ item% %size +loop ; 
+
+: stack-pointer-update { stack -- }
+    \ stack grow downwards
+    stack stack-in @ stack stack-out @ -
+    ?dup-if \ this check is not necessary, gcc would do this for us
+	stack stack-pointer 2@ type ."  += " 0 .r ." ;" cr
+    endif ;
 
 : stack-pointer-updates ( -- )
-\ we need not check if an update is a noop; gcc does this for us
- effect-in-size 2@
- effect-out-size 2@
- rot swap - ( d-in d-out f-diff )
- rot rot - ( f-diff d-diff )
- ?dup IF  ." sp += " 0 .r ." ;" cr  THEN
- ?dup IF  ." fp += " 0 .r ." ;" cr  THEN ;
+    inst-stream  stack-pointer-update
+    data-stack   stack-pointer-update
+    fp-stack     stack-pointer-update
+    return-stack stack-pointer-update ;
 
 : store ( item -- )
 \ f is true if the item should be stored
 \ f is false if the store is probably not necessary
- dup item-type @ type-store-handler execute ;
+ dup item-type @ type-store @ execute ;
 
 : stores ( -- )
  effect-out-end @ effect-out ?do
    i store
- item-descr +loop ; 
+ item% %size +loop ; 
 
-: .stack-list ( start end -- )
- swap ?do
-   i item-name 2@ type space
- item-descr +loop ; 
+: output-c-tail ( -- )
+    \ the final part of the generated C code
+    ." NEXT_P1;" cr
+    stores
+    fill-tos
+    ." NEXT_P2;" cr ;
+
+: type-c ( c-addr u -- )
+    \ like TYPE, but replaces "TAIL;" with tail code
+    begin ( c-addr1 u1 )
+	2dup s" TAIL;" search
+    while ( c-addr1 u1 c-addr3 u3 )
+	2dup 2>r drop nip over - type
+	output-c-tail
+	2r> 5 /string
+	\ !! resync #line missing
+    repeat
+    2drop type ;
 
-: output-c ( -- ) 1 flush-comment !
-    ?flush-comment
- ." I_" c-name 2@ type ." :	/* " forth-name 2@ type ."  ( " stack-string 2@ type ."  ) */" cr
+: output-c ( -- ) 
+ ." I_" c-name 2@ type ." :	/* " forth-name 2@ type ."  ( " stack-string 2@ type ." ) */" cr
  ." /* " doc 2@ type ."  */" cr
  ." NAME(" [char] " emit forth-name 2@ type [char] " emit ." )" cr \ debugging
  ." {" cr
@@ -620,16 +634,16 @@ set-current
  stack-pointer-updates
  ." {" cr
  ." #line " c-line @ . [char] " emit c-filename 2@ type [char] " emit cr
- c-code 2@ type
+ c-code 2@ type-c
  ." }" cr
- ." NEXT_P1;" cr
- stores
- fill-tos
- ." NEXT_P2;" cr
+ output-c-tail
  ." }" cr
  cr
 ;
 
+: stack-used? { stack -- f }
+    stack stack-in @ stack stack-out @ or 0<> ;
+
 : output-funclabel ( -- )
   1 function-number +!
   ." &I_" c-name 2@ type ." ," cr ;
@@ -639,50 +653,49 @@ set-current
   '" emit forth-name 2@ type '" emit ." ," cr ;
 
 : output-c-func ( -- )
+\ used for word libraries
     1 function-number +!
-    ." void I_" c-name 2@ type ." ()      /* " forth-name 2@ type
+    ." Cell * I_" c-name 2@ type ." (Cell *SP, Cell **FP)      /* " forth-name 2@ type
     ."  ( " stack-string 2@ type ."  ) */" cr
     ." /* " doc 2@ type ."  */" cr
     ." NAME(" [char] " emit forth-name 2@ type [char] " emit ." )" cr
     \ debugging
     ." {" cr
-    ." DEF_CA" cr
     declarations
     compute-offsets \ for everything else
-    ." NEXT_P0;" cr
+    inst-stream  stack-used? IF ." Cell *ip=IP;" cr THEN
+    data-stack   stack-used? IF ." Cell *sp=SP;" cr THEN
+    fp-stack     stack-used? IF ." Cell *fp=*FP;" cr THEN
+    return-stack stack-used? IF ." Cell *rp=*RP;" cr THEN
     flush-tos
     fetches
     stack-pointer-updates
+    fp-stack   stack-used? IF ." *FP=fp;" cr THEN
     ." {" cr
     ." #line " c-line @ . [char] " emit c-filename 2@ type [char] " emit cr
     c-code 2@ type
     ." }" cr
-    ." NEXT_P1;" cr
     stores
     fill-tos
-    ." NEXT_P2;" cr
+    ." return (sp);" cr
     ." }" cr
     cr ;
 
-: output-label ( -- )  1 flush-comment !
-    ?flush-comment
+: output-label ( -- )  
     ." (Label)&&I_" c-name 2@ type ." ," cr
     -1 primitive-number +! ;
 
-: output-alias ( -- )  flush-comment on
-    ?flush-comment
+: output-alias ( -- ) 
     ( primitive-number @ . ." alias " ) ." Primitive " forth-name 2@ type cr
     -1 primitive-number +! ;
 
-: output-forth ( -- )  flush-comment on
-    ?flush-comment
+: output-forth ( -- )  
     forth-code @ 0=
     IF    	\ output-alias
 	\ this is bad for ec: an alias is compiled if tho word does not exist!
 	\ JAW
     ELSE  ." : " forth-name 2@ type ."   ( "
-	effect-in effect-in-end @ .stack-list ." -- "
-	effect-out effect-out-end @ .stack-list ." )" cr
+	stack-string 2@ type ." )" cr
 	forth-code 2@ type cr
 	-1 primitive-number +!
     THEN ;