File:  [gforth] / gforth / cross.fs
Revision 1.11: download - view: text, annotated - select for diffs
Fri Sep 2 15:23:33 1994 UTC (25 years, 3 months ago) by pazsan
Branches: MAIN
CVS tags: HEAD
Corrected bug in error reporting due to input stream restoration
Corrected bug in cross compiler du to later defined constants
renamed search into lookup and implemented the correct "search"
UPS: removed double deferred header and (header) - if problems tell
me why double deferred?

\ CROSS.FS     The Cross-Compiler                      06oct92py
\ $Id: cross.fs,v 1.11 1994/09/02 15:23:33 pazsan Exp $
\ Idea and implementation: Bernd Paysan (py)
\ Copyright 1992 by the ANSI figForth Development Group

\ Log:
\       changed in ; [ to state off           12may93jaw
\       included place +place                 12may93jaw
\       for a created word (variable, constant...)
\       is now an alias in the target voabulary.
\       this means it is no longer necessary to
\       switch between vocabularies for variable
\       initialization                        12may93jaw
\       discovered error in DOES>
\       replaced !does with (;code)           16may93jaw
\       made complete redesign and
\       introduced two vocs method
\       to be asure that the right words
\       are found                             08jun93jaw
\       btw:  ! works not with 16 bit
\             targets                         09jun93jaw
\       added: 2user and value                11jun93jaw

\ include other.fs       \ ansforth extentions for cross

: comment? ( c-addr u -- c-addr u )
        2dup s" (" compare 0=
        IF    postpone (
        ELSE  2dup s" \" compare 0= IF postpone \ THEN
        THEN ;

decimal

\ Begin CROSS COMPILER:

\ GhostNames                                            9may93jaw
\ second name source to search trough list

VARIABLE GhostNames
0 GhostNames !
: GhostName ( -- addr )
        here GhostNames @ , GhostNames ! here 0 ,
        name count
\        2dup type space
        dup c, here over chars allot swap move align ;

hex


Vocabulary Cross
Vocabulary Target
Vocabulary Ghosts
VOCABULARY Minimal
only Forth also Target also also
definitions Forth

: T  previous Cross also Target ; immediate
: G  Ghosts ; immediate
: H  previous Forth also Cross ; immediate

forth definitions

: T  previous Cross also Target ; immediate
: G  Ghosts ; immediate

: >cross  also Cross definitions previous ;
: >target also Target definitions previous ;
: >minimal also Minimal definitions previous ;

H

>CROSS

\ Variables                                            06oct92py

-1 Constant NIL
Variable image
Variable tlast    NIL tlast !  \ Last name field
Variable tlastcfa \ Last code field
Variable tdoes    \ Resolve does> calls
Variable bit$
Variable tdp
: there  tdp @ ;

\ Parameter for target systems                         06oct92py

include-file

>TARGET

\ Byte ordering and cell size                          06oct92py

: cell+         cell + ;
: cells         cell<< lshift ;
: chars         ;
: floats	float * ;
    
>CROSS
: cell/         cell<< rshift ;
>TARGET
20 CONSTANT bl
-1 Constant NIL
-2 Constant :docol
-3 Constant :docon
-4 Constant :dovar
-5 Constant :douser
-6 Constant :dodefer
-7 Constant :dodoes
-8 Constant :doesjump

>CROSS

endian  0 pad ! -1 pad c! pad @ 0<
= [IF]   : bswap ; immediate 
[ELSE]   : bswap ( big / little -- little / big )  0
           cell 1- FOR  bits/byte lshift over
                        [ 1 bits/byte lshift 1- ] Literal and or
                        swap bits/byte rshift swap  NEXT  nip ;
[THEN]

\ Memory initialisation                                05dec92py
\ Fixed bug in else part                               11may93jaw

[IFDEF] Memory \ Memory is a bigFORTH feature
   also Memory
   : initmem ( var len -- )
     2dup swap handle! >r @ r> erase ;
   toss
[ELSE]
   : initmem ( var len -- )
     tuck allocate abort" CROSS: No memory for target"
     ( len var adr ) dup rot !
     ( len adr ) swap erase ;
[THEN]

\ MakeKernal                                           12dec92py

>MINIMAL
: makekernal ( targetsize -- targetsize )
  bit$  over 1- cell>bit rshift 1+ initmem
  image over initmem tdp off ;

>CROSS
\ Bit string manipulation                               06oct92py
\                                                       9may93jaw
CREATE Bittable 80 c, 40 c, 20 c, 10 c, 8 c, 4 c, 2 c, 1 c,
: bits ( n -- n ) chars Bittable + c@ ;

: >bit ( addr n -- c-addr mask ) 8 /mod rot + swap bits ;
: +bit ( addr n -- )  >bit over c@ or swap c! ;
: -bit ( addr n -- )  >bit invert over c@ and swap c! ;
: relon ( taddr -- )  bit$ @ swap cell/ +bit ;
: reloff ( taddr -- )  bit$ @ swap cell/ -bit ;

\ Target memory access                                 06oct92py

: align+  ( taddr -- rest )
    cell tuck 1- and - [ cell 1- ] Literal and ;

>TARGET
: aligned ( taddr -- ta-addr )  dup align+ + ;
\ assumes cell alignment granularity (as GNU C)

>CROSS
: >image ( taddr -- absaddr )  image @ + ;
>TARGET
: @  ( taddr -- w )     >image @ bswap ;
: !  ( w taddr -- )     >r bswap r> >image ! ;
: c@ ( taddr -- char )  >image c@ ;
: c! ( char taddr -- )  >image c! ;
: 2@ ( taddr -- x1 x2 ) T dup cell+ @ swap @ H ;
: 2! ( x1 x2 taddr -- ) T swap over ! cell+ ! H ;

\ Target compilation primitives                        06oct92py
\ included A!                                          16may93jaw

: here  ( -- there )    there ;
: allot ( n -- )        tdp +! ;
: ,     ( w -- )        T here H cell T allot  ! H ;
: c,    ( char -- )     T here    1 allot c! H ;
: align ( -- )          T here H align+ 0 ?DO  bl T c, H LOOP ;

: A!                    dup relon T ! H ;
: A,    ( w -- )        T here H relon T , H ;

>CROSS

\ threading modell                                     13dec92py

\ generic threading modell
: docol,  ( -- ) :docol T A, 0 , H ;

>TARGET
: >body   ( cfa -- pfa ) T cell+ cell+ H ;
>CROSS

: dodoes, ( -- ) T :doesjump A, 0 , H ;

\ Ghost Builder                                        06oct92py

\ <T T> new version with temp variable                 10may93jaw

VARIABLE VocTemp

: <T  get-current VocTemp ! also Ghosts definitions ;
: T>  previous VocTemp @ set-current ;

4711 Constant <fwd>             4712 Constant <res>
4713 Constant <imm>

\ iForth makes only immediate directly after create
\ make atonce trick! ?

Variable atonce atonce off

: NoExec true ABORT" CROSS: Don't execute ghost" ;

: GhostHeader <fwd> , 0 , ['] NoExec , ;

: >magic ; : >link cell+ ; : >exec cell+ cell+ ;
: >end 3 cells + ;

Variable last-ghost
: Make-Ghost ( "name" -- ghost )
  >in @ GhostName swap >in !
  <T Create atonce @ IF immediate atonce off THEN
  here tuck swap ! ghostheader T>
  DOES> dup last-ghost ! >exec @ execute ;

\ ghost words                                          14oct92py
\                                          changed:    10may93py/jaw

: gfind   ( string -- ghost true/1 / string false )
\ searches for string in word-list ghosts
\ !! wouldn't it be simpler to just use search-wordlist ? ae
  dup count [ ' ghosts >body ] ALiteral search-wordlist
\ >r get-order  0 set-order also ghosts  r> find >r >r
  >r r@ IF  >body nip  THEN  r> ;
\ set-order  r> r@  IF  >body  THEN  r> ;

VARIABLE Already

: ghost   ( "name" -- ghost )
  Already off
  >in @  name gfind   IF  Already on nip EXIT  THEN
  drop  >in !  Make-Ghost ;

\ resolve                                              14oct92py

: resolve-loop ( ghost tcfa -- ghost tcfa )
  >r dup >link @
  BEGIN  dup  WHILE  dup T @ H r@ rot T ! H REPEAT  drop r> ;

\ exists                                                9may93jaw

: exists ( ghost tcfa -- )
  over GhostNames
  BEGIN @ dup
  WHILE 2dup cell+ @ =
  UNTIL
        nip 2 cells + count cr ." CROSS: Exists: " type 4 spaces
        swap cell+ !
  ELSE true ABORT" CROSS: Ghostnames inconsistent"
  THEN ;

: resolve  ( ghost tcfa -- )
  over >magic @ <fwd> <>  IF  exists EXIT THEN
  resolve-loop  over >link ! <res> swap >magic ! ;

\ gexecute ghost,                                      01nov92py

: do-forward   ( ghost -- )
  >link dup @  there rot !  T  A,  H ;
: do-resolve   ( ghost -- )
  >link @                   T  A,  H ;

: gexecute   ( ghost -- )   dup @
             <fwd> = IF  do-forward  ELSE  do-resolve  THEN ;
: ghost,     ghost  gexecute ;

\ .unresolved                                          11may93jaw

variable ResolveFlag

\ ?touched                                             11may93jaw

: ?touched ( ghost -- flag ) dup >magic @ <fwd> = swap >link @
                               0 <> and ;

: ?resolved  ( ghostname -- )
  dup cell+ @ ?touched
  IF  cell+ cell+ count cr type ResolveFlag on ELSE drop THEN ;

>MINIMAL
: .unresolved  ( -- )
  ResolveFlag off cr ." Unresolved: "
  Ghostnames
  BEGIN @ dup
  WHILE dup ?resolved
  REPEAT drop ResolveFlag @
  IF
      abort" Unresolved words!"
  ELSE
      ." Nothing!"
  THEN
  cr ;

>CROSS
\ Header states                                        12dec92py

: flag! ( 8b -- )   tlast @ dup >r T c@ xor r> c! H ;

VARIABLE ^imm

>TARGET
: immediate     20 flag!
                ^imm @ @ dup <imm> = ?EXIT
                <res> <> ABORT" CROSS: Cannot immediate a unresolved word"
                <imm> ^imm @ ! ;
: restrict      40 flag! ;
>CROSS

\ ALIAS2 ansforth conform alias                          9may93jaw

: ALIAS2 create here 0 , DOES> @ execute ;
\ usage:
\ ' alias2 bla !

\ Target Header Creation                               01nov92py

: string,  ( addr count -- )
  dup T c, H bounds  DO  I c@ T c, H  LOOP ; 
: name,  ( "name" -- )  name count string, T align H ;
: view,   ( -- ) ( dummy ) ;

VARIABLE CreateFlag CreateFlag off

: (Theader ( "name" -- ghost ) T align H view,
  tlast @ dup 0> IF  T 1 cells - THEN  A, H  there tlast !
  >in @ name, >in ! T here H tlastcfa !
  CreateFlag @ IF
  >in @ alias2 swap >in !         \ create alias in target
  >in @ ghost swap >in !
  swap also ghosts ' previous swap !        \ tick ghost and store in alias
  CreateFlag off
  ELSE ghost THEN
  dup >magic ^imm !     \ a pointer for immediate
  Already @ IF  dup >end tdoes !
  ELSE 0 tdoes ! THEN
  80 flag! ;

VARIABLE ;Resolve 1 cells allot

: Theader  ( "name" -- ghost )
  (THeader dup there resolve 0 ;Resolve ! ;

>TARGET
: Alias    ( cfa -- ) \ name
  (THeader over resolve T A, H 80 flag! ;
>CROSS

\ Conditionals and Comments                            11may93jaw

: ;Cond
  postpone ;
  swap ! ;  immediate

: Cond: ( -- ) \ name {code } ;
  atonce on
  ghost
  >exec
  :NONAME ;

: restrict? ( -- )
\ aborts on interprete state - ae
  state @ 0= ABORT" CROSS: Restricted" ;

: Comment ( -- )
  >in @ atonce on ghost swap >in ! ' swap >exec ! ;

Comment (       Comment \

\ Predefined ghosts                                    12dec92py

ghost 0=                                        drop
ghost branch    ghost ?branch                   2drop
ghost (do)      ghost (?do)                     2drop
ghost (for)                                     drop
ghost (loop)    ghost (+loop)                   2drop
ghost (next)                                    drop
ghost unloop    ghost ;S                        2drop
ghost lit       ghost (compile) ghost !         2drop drop
ghost (;code)   ghost noop                      2drop
ghost (.")      ghost (S")      ghost (ABORT")  2drop drop
ghost '

\ compile                                              10may93jaw

: compile  ( -- ) \ name
  restrict?
  name gfind dup 0= ABORT" CROSS: Can't compile "
  0> ( immediate? )
  IF    >exec @ compile,
  ELSE  postpone literal postpone gexecute  THEN ;
                                        immediate

>TARGET
: '  ( -- cfa ) name gfind 0= ABORT" CROSS: undefined "
  dup >magic @ <fwd> = ABORT" CROSS: forward " >link @ ;

Cond: [']  compile lit ghost gexecute ;Cond

>CROSS
\ tLiteral                                             12dec92py

: lit, ( n -- )   compile lit T  ,  H ;
: alit, ( n -- )  compile lit T A,  H ;

>TARGET
Cond:  Literal ( n -- )   restrict? lit, ;Cond
Cond: ALiteral ( n -- )   restrict? alit, ;Cond

: Char ( "<char>" -- )  bl word char+ c@ ;
Cond: [Char]   ( "<char>" -- )  restrict? Char  lit, ;Cond

>CROSS
\ Target compiling loop                                12dec92py
\ ">tib trick thrown out                               10may93jaw
\ number? defined at the top                           11may93jaw

\ compiled word might leave items on stack!
: tcom ( in name -- )
  gfind  ?dup  IF    0> IF    nip >exec @ execute
                        ELSE  nip gexecute  THEN EXIT THEN
  number? dup  IF    0> IF swap lit,  THEN  lit,  drop
               ELSE  2drop >in !
               ghost gexecute THEN  ;

>TARGET
\ : ; DOES>                                            13dec92py
\ ]                                                     9may93py/jaw

: ] state on
    BEGIN
        BEGIN >in @ name
              dup c@ 0= WHILE 2drop refill 0=
              ABORT" CROSS: End of file while target compiling"
        REPEAT
        tcom
        state @
        0=
    UNTIL ;

\ by the way: defining a second interpreter (a compiler-)loop
\             is not allowed if a system should be ans conform

: : ( -- colon-sys ) \ Name
  (THeader ;Resolve ! there ;Resolve cell+ !
  docol, depth T ] H ;

Cond: EXIT ( -- )  restrict?  compile ;S  ;Cond

Cond: ?EXIT ( -- ) 1 abort" CROSS: using ?exit" ;Cond

Cond: ; ( -- ) restrict?
               depth ?dup IF   1- <> ABORT" CROSS: Stack changed"
                          ELSE true ABORT" CROSS: Stack empty" THEN
               compile ;S state off
               ;Resolve @
               IF ;Resolve @ ;Resolve cell+ @ resolve THEN
               ;Cond
Cond: [  restrict? state off ;Cond

>CROSS
: !does  :dodoes tlastcfa @ tuck T ! cell+ ! H ;

>TARGET
Cond: DOES> restrict?
        compile (;code) dodoes, tdoes @ ?dup IF  @ T here H resolve THEN
        ;Cond
: DOES> dodoes, T here H !does depth T ] H ;

>CROSS
\ Creation                                             01nov92py

\ Builder                                               11may93jaw

: Builder    ( Create do: "name" -- )
  >in @ alias2 swap dup >in ! >r >r
  Make-Ghost rot swap >exec ! ,
  r> r> >in !
  also ghosts ' previous swap ! ;
\  DOES>  dup >exec @ execute ;

: gdoes,  ( ghost -- )  >end @ dup >magic @ <fwd> <>
  IF dup >link @ dup 0< IF T A, 0 , H drop EXIT THEN drop THEN
  :dodoes T A, H gexecute T here H cell - reloff ;

: TCreate ( -- )
  last-ghost @
  CreateFlag on
  Theader >r dup gdoes,
  >end @ >exec @ r> >exec ! ;

: Build:  ( -- [xt] [colon-sys] )
  :noname  postpone TCreate ;

: gdoes>  ( ghost -- addr flag )
  last-ghost @
  state @ IF  gexecute true EXIT  THEN
  cell+ @ T >body H false ;

\ DO: ;DO                                               11may93jaw
\ changed to ?EXIT                                      10may93jaw

: DO:     ( -- addr [xt] [colon-sys] )
  here ghostheader
  :noname postpone gdoes> postpone ?EXIT ;

: ;DO ( addr [xt] [colon-sys] -- )
  postpone ;    ( S addr xt )
  over >exec ! ; immediate

: by      ( -- addr ) \ Name
  ghost >end @ ;

>TARGET
\ Variables and Constants                              05dec92py

Build:  ;
DO: ( ghost -- addr ) ;DO
Builder Create
by Create :dovar resolve

Build: T 0 , H ;
by Create
Builder Variable

Build: T 0 A, H ;
by Create
Builder AVariable

\ User variables                                       04may94py

>CROSS
Variable tup  0 tup !
Variable tudp 0 tudp !
: u,  ( n -- udp )
  tup @ tudp @ + T  ! H
  tudp @ dup cell+ tudp ! ;
: au, ( n -- udp )
  tup @ tudp @ + T A! H
  tudp @ dup cell+ tudp ! ;
>TARGET

Build: T 0 u, , H ;
DO: ( ghost -- up-addr )  T @ H tup @ + ;DO
Builder User
by User :douser resolve

Build: T 0 u, , 0 u, drop H ;
by User
Builder 2User

Build: T 0 au, , H ;
by User
Builder AUser

Build:  ( n -- ) T , H ;
DO: ( ghost -- n ) T @ H ;DO
Builder Constant
by Constant :docon resolve

Build:  ( n -- ) T A, H ;
by Constant
Builder AConstant

Build: T 0 , H ;
by Constant
Builder Value

Build:  ( -- ) compile noop ;
DO: ( ghost -- ) ABORT" CROSS: Don't execute" ;DO
Builder Defer
by Defer :dodefer resolve

\ structural conditionals                              17dec92py

>CROSS
: ?struc      ( flag -- )       ABORT" CROSS: unstructured " ;
: sys?        ( sys -- sys )    dup 0= ?struc ;
: >mark       ( -- sys )        T here  0 , H ;
: >resolve    ( sys -- )        T here over - swap ! H ;
: <resolve    ( sys -- )        T here - , H ;
>TARGET

\ Structural Conditionals                              12dec92py

Cond: BUT       restrict? sys? swap ;Cond
Cond: YET       restrict? sys? dup ;Cond

>CROSS
Variable tleavings
>TARGET

Cond: DONE   ( addr -- )  restrict? tleavings @
      BEGIN  2dup u> 0=  WHILE  dup T @ H swap >resolve REPEAT
      tleavings ! drop ;Cond

>CROSS
: (leave  T here H tleavings @ T , H  tleavings ! ;
>TARGET

Cond: LEAVE     restrict? compile branch (leave ;Cond
Cond: ?LEAVE    restrict? compile 0=  compile ?branch (leave  ;Cond

\ Structural Conditionals                              12dec92py

Cond: AHEAD     restrict? compile branch >mark ;Cond
Cond: IF        restrict? compile ?branch >mark ;Cond
Cond: THEN      restrict? sys? dup T @ H ?struc >resolve ;Cond
Cond: ELSE      restrict? sys? compile AHEAD swap compile THEN ;Cond

Cond: BEGIN     restrict? T here H ;Cond
Cond: WHILE     restrict? sys? compile IF swap ;Cond
Cond: AGAIN     restrict? sys? compile branch <resolve ;Cond
Cond: UNTIL     restrict? sys? compile ?branch <resolve ;Cond
Cond: REPEAT    restrict? over 0= ?struc compile AGAIN compile THEN ;Cond

\ Structural Conditionals                              12dec92py

Cond: DO        restrict? compile (do)   T here H ;Cond
Cond: ?DO       restrict? compile (?do)  (leave T here H ;Cond
Cond: FOR       restrict? compile (for)  T here H ;Cond

>CROSS
: loop]   dup <resolve cell - compile DONE compile unloop ;
>TARGET

Cond: LOOP      restrict? sys? compile (loop)  loop] ;Cond
Cond: +LOOP     restrict? sys? compile (+loop) loop] ;Cond
Cond: NEXT      restrict? sys? compile (next)  loop] ;Cond

\ String words                                         23feb93py

: ,"            [char] " parse string, T align H ;

Cond: ."        restrict? compile (.")     T ," H ;Cond
Cond: S"        restrict? compile (S")     T ," H ;Cond
Cond: ABORT"    restrict? compile (ABORT") T ," H ;Cond

Cond: IS        T ' >body H compile ALiteral compile ! ;Cond
: IS            T ' >body ! H ;
Cond: TO        T ' >body H compile ALiteral compile ! ;Cond
: TO            T ' >body ! H ;

\ LINKED ERR" ENV" 2ENV"                                18may93jaw

\ linked list primitive
: linked        T here over @ A, swap ! H ;

: err"   s" ErrLink linked" evaluate T , H
         [char] " parse string, T align H ;

: env"  [char] " parse s" EnvLink linked" evaluate
        string, T align , H ;

: 2env" [char] " parse s" EnvLink linked" evaluate
        here >r string, T align , , H
        r> dup T c@ H 80 and swap T c! H ;

\ compile must be last                                 22feb93py

Cond: compile ( -- ) restrict? \ name
      name gfind dup 0= ABORT" CROSS: Can't compile"
      0> IF    gexecute
         ELSE  dup >magic @ <imm> =
               IF   gexecute
               ELSE compile (compile) gexecute THEN THEN ;Cond

Cond: postpone ( -- ) restrict? \ name
      name gfind dup 0= ABORT" CROSS: Can't compile"
      0> IF    gexecute
         ELSE  dup >magic @ <imm> =
               IF   gexecute
               ELSE compile (compile) gexecute THEN THEN ;Cond

>MINIMAL
also minimal
\ Usefull words                                        13feb93py

: KB  400 * ;

\ define new [IFDEF] and [IFUNDEF]                      20may93jaw

: there? name gfind IF >magic @ <fwd> <> ELSE drop false THEN ;

: [IFDEF] there? postpone [IF] ;
: [IFUNDEF] there? 0= postpone [IF] ;

\ C: \- \+ Conditional Compiling                         09jun93jaw

: C: >in @ there? 0=
     IF    >in ! T : H
     ELSE drop
        BEGIN bl word dup c@
              IF   count comment? s" ;" compare 0= ?EXIT
              ELSE refill 0= ABORT" CROSS: Out of Input while C:"
              THEN
        AGAIN
     THEN ;

also minimal

: \- there? IF postpone \ THEN ;
: \+ there? 0= IF postpone \ THEN ;

: [IF]   postpone [IF] ;
: [THEN] postpone [THEN] ;
: [ELSE] postpone [ELSE] ;

Cond: [IF]      [IF] ;Cond
Cond: [IFDEF]   [IFDEF] ;Cond
Cond: [IFUNDEF] [IFUNDEF] ;Cond
Cond: [THEN]    [THEN] ;Cond
Cond: [ELSE]    [ELSE] ;Cond

\ save-cross                                           17mar93py

\ i'm not interested in bigforth features this time    10may93jaw
\ [IFDEF] file
\ also file
\ [THEN]
\ included throw after create-file                     11may93jaw

endian Constant endian

: save-cross ( "name" -- )
  bl parse ." Saving to " 2dup type
  w/o bin create-file throw >r
  image @ there r@ write-file throw
  bit$  @ there 1- cell>bit rshift 1+ r@ write-file throw
  r> close-file throw ;

\ words that should be in minimal

: + + ;         : 1- 1- ;
: - - ;         : 2* 2* ;
: * * ;         : / / ;
: dup dup ;     : over over ;
: swap swap ;   : rot rot ;

\ include bug5.fs
\ only forth also minimal definitions

: \ postpone \ ;
: ( postpone ( ;
: include bl word count included ;
: .( [char] ) parse type ;
: cr cr ;

: times 0 ?DO dup T c, H LOOP drop ; \ used for space table creation
only forth also minimal definitions

\ cross-compiler words

: decimal       decimal ;
: hex           hex ;

: tudp          T tudp H ;
: tup           T tup H ;  minimal

\ for debugging...
: order         order ;
: words         words ;
: .s            .s ;

: bye           bye ;

\ turnkey direction
: H forth ; immediate
: T minimal ; immediate
: G ghosts ; immediate

: turnkey  0 set-order also Target definitions
           also Minimal also ;

\ these ones are pefered:

: lock   turnkey ;
: unlock forth also cross ;

unlock definitions also minimal
: lock   lock ;
lock

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