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VolksForth/sources/msdos/see.fth
Carsten Strotmann fabfc21586 Tools: fb2fth (Forth-Block to Forth Source) in gforth
2020-07-20 23:47:02 +02:00

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\ *** Block No. 0 Hexblock 0
\ Extended-Decompiler for VolksForth cas 10nov05
This file contains the volksFORTH decompiler. The decompiler
will convert FORTH code back to Sourcecode.
Conditional words like IF THEN ELSE, BEGIN WHILE REPEAT UNTIL
and DO LOOP +LOOP are identified and converted.
The Decompiler cannot re-create comments, so please use
comments in screens and view.
Because: There is always one more bug!
And to correct bug, nothing beats good commented sourcecode.
Usage: SEE <name>
\ *** Block No. 1 Hexblock 1
\ Extended-Decompiler for VolksForth LOAD-SCREEN ks 22 dez 87
Onlyforth Tools also definitions
| : internal 1 ?head ! ;
| : external ?head off ;
1 &18 +thru
\\
Produces compilable Forth source from normal compiled Forth.
These source blocks are based on the works of
Henry Laxen, Mike Perry and Wil Baden
volksFORTH version: U. Hoffmann
\ *** Block No. 2 Hexblock 2
\ detecting does> ks 22 dez 87
internal
' Forth @ 1+ dup @ + 2+ Constant (dodoes>
: does? ( IP - f )
dup c@ $E9 ( jmp ) =
swap 1+ dup @ + 2+ (dodoes> = and ;
\ *** Block No. 3 Hexblock 3
\ indentation. 04Jul86
Variable #spaces #spaces off
: +in ( -- ) 3 #spaces +! ;
: -in ( -- ) -3 #spaces +! ;
: ind-cr ( -- ) ( col #spaces @ = ?exit ) cr #spaces @ spaces ;
: ?ind-cr ( -- ) col c/l u> IF ind-cr THEN ;
\ *** Block No. 4 Hexblock 4
\ case defining words 01Jul86
: Case: ( -- )
Create: Does> swap 2* + perform ;
: Associative: ( n -- )
Constant Does> ( n - index )
dup @ -rot dup @ 0
DO 2+ 2dup @ =
IF 2drop drop I 0 0 LEAVE THEN LOOP 2drop ;
\ *** Block No. 5 Hexblock 5
\ branching 04Jul86
Variable #branches Variable #branch
: branch-type ( n -- a ) 6 * pad + ;
: branch-from ( n -- a ) branch-type 2+ ;
: branch-to ( n -- a ) branch-type 4+ ;
: branched ( adr type -- ) \ Make entry in branch-table.
#branches @ branch-type ! dup #branches @ branch-from !
2+ dup @ + #branches @ branch-to ! 1 #branches +! ;
\\ branch-table: { type0|from0|to0 | type1|from1|to1 ... }
\ *** Block No. 6 Hexblock 6
\ branching 01Jul86
: branch-back ( adr type -- )
\ : make entry in branch-table & reclassify branch-type.)
over swap branched
2+ dup dup @ + swap 2+ ( loop-start,-end.)
0 #branches @ 1-
?DO
over I branch-from @ u> IF LEAVE THEN
dup I branch-to @ = IF ['] while I branch-type ! THEN
-1 +LOOP 2drop ;
\ *** Block No. 7 Hexblock 7
\ branching 01Jul86
: forward? ( ip -- f ) 2+ @ 0> ;
: ?branch+ ( ip -- ip' ) dup 4+ swap dup forward?
IF ['] if branched exit THEN ['] until branch-back ;
: branch+ ( ip -- ip' ) dup 4+ swap dup forward?
IF ['] else branched exit THEN ['] repeat branch-back ;
: (loop)+ ( ip -- ip' )
dup dup @ ( loop,+loop ) branch-back -1 #branches +! 4+ ;
: string+ ( ip -- ip' ) 2+ count + even ;
: (;code+ ( ip -- ip' ) 2+ dup does? not IF 0= exit THEN 3+ ;
\ *** Block No. 8 Hexblock 8
\ classify each word 25Aug86
Forth
&15 Associative: execution-class
] clit lit ?branch branch
(do (." (abort" (;code
(" (?do (loop
(+loop unnest (is compile [
Case: execution-class+
3+ 4+ ?branch+ branch+
2+ string+ string+ (;code+
string+ 2+ 4+
4+ 0= 4+ 4+ 2+ ;
Tools
\ *** Block No. 9 Hexblock 9
\ first pass ks 22 dez 87
: pass1 ( cfa -- ) #branches off >body
BEGIN dup @ execution-class execution-class+
dup 0= stop? or
UNTIL drop ;
: thru.branchtable ( -- limit start ) #branches @ 0 ;
\ *** Block No. 10 Hexblock A
\ identify branch destinations. ks 22 dez 87
: ?.then ( ip -- ) thru.branchtable
?DO I branch-to @ over =
IF I branch-from @ over u<
IF I branch-type @ dup ['] else = swap ['] if = or
IF -in ." THEN " ind-cr LEAVE THEN THEN THEN
LOOP ;
: ?.begin ( ip -- ) thru.branchtable
?DO I branch-to @ over =
IF I branch-from @ over u< not
IF I branch-type @ dup
['] repeat = swap ['] until = or
IF ind-cr ." BEGIN " +in LEAVE THEN THEN THEN
LOOP ;
( put "BEGIN" and "THEN" where used.)
\ *** Block No. 11 Hexblock B
\ decompile each type of word 01Jul86
: .word ( ip -- ip' ) dup @ >name .name 2+ ;
: .(word ( ip -- ip' ) dup @ >name
?dup 0= IF ." ??? " ELSE
count $1f and swap 1+ swap 1- type space THEN 2+ ;
: .inline ( val16b -- )
dup >name ?dup IF ." ['] " .name drop exit THEN . ;
: .lit ( ip -- ip' ) 2+ dup @ .inline 2+ ?.then ;
: .clit ( ip -- ip' ) 2+ dup c@ . 1+ ?.then ;
: .string ( ip -- ip' )
.(word count 2dup type Ascii " emit space + even ?.then ;
: .unnest ( ip -- 0 ) ." ; " 0= ;
\ *** Block No. 12 Hexblock C
\ decompile each type of word 01Jul86
: .default ( ip -- ip' ) dup @ >name ?dup IF
c@ $40 and IF ." [COMPILE] " THEN THEN .word ?.then ;
: .['] ( ip -- ip' ) .(word dup @ 2- >name .name 2+ ?.then ;
: .compile ( ip -- ip' ) .word .word ?.then ;
\ *** Block No. 13 Hexblock D
\ decompiling conditionals 04Jul86
: .if ( ip nfa -- ip' ) ind-cr .name +in 4+ ?.then ;
: .repeat ( ip nfa -- ip' ) -in .name ind-cr 4+ ?.then ;
: .else ( ip nfa -- ip' ) -in ind-cr .name +in 4+ ;
: .do ( ip nfa -- ip' ) ind-cr .(word +in 2+ ?.then ;
: .loop ( ip nfa -- ip' ) -in .(word ind-cr 2+ ?.then ;
5 Associative: branch-class
' if , ' while , ' else , ' repeat , ' until ,
Case: .branch-class
.if .else .else .repeat .repeat ;
: .branch ( ip -- ip' )
#branch @ branch-type @ 1 #branch +!
dup >name swap branch-class .branch-class ;
\ *** Block No. 14 Hexblock E
\ decompile Does> ;code 04Jul86
: .(;code ( IP - IP' f)
2+ dup does?
IF ind-cr ." DOES> " 3+ ELSE ." ;CODE " 0= THEN ;
\ *** Block No. 15 Hexblock F
\ classify word's output 01Jul86
Case: .execution-class
.clit .lit .branch .branch
.do .string .string .(;code
.string .do .loop
.loop .unnest .['] .compile
.default ;
\ *** Block No. 16 Hexblock 10
\ decompile colon-definitions 04Jul86
: pass2 ( cfa -- ) #branch off >body
BEGIN ?.begin ?ind-cr dup @ execution-class .execution-class
dup 0= stop? or
UNTIL drop ;
: .pfa ( cfa -- ) #spaces off +in dup pass1 pass2 ;
: .immediate ( cfa - ) >name c@ dup
?ind-cr 40 and IF ." IMMEDIATE " THEN
?ind-cr 80 and IF ." RESTRICT" THEN ;
: .: ( cfa - ) ." : " dup >name .name 3 spaces .pfa ;
\ *** Block No. 17 Hexblock 11
\ display category of word 01Jul86
external Defer (see internal
: .does> ( cfa - ) ." DOES> " @ 1+ .pfa ;
: .user-variable ( cfa - ) ." USER " dup >name dup .name
3 spaces swap execute @ u. .name ." ! " ;
: .defer ( cfa - )
." deferred " dup >name .name ." Is " >body @ (see ;
: .other ( cfa - ) dup >name .name
dup @ over >body = IF drop ." is Code " exit THEN
dup @ does? IF .does> exit THEN
drop ." is unknown " ;
\ *** Block No. 18 Hexblock 12
\ decompiling variables and constants ks 22 dez 87
: .constant ( cfa - )
dup >body @ u. ." CONSTANT " >name .name ;
: .variable ( cfa - ) ." VARIABLE "
dup >name dup .name 3 spaces swap >body @ u. .name ." ! " ;
5 Associative: definition-class
' quit @ , ' 0 @ , ' scr @ , ' base @ ,
' 'cold @ ,
Case: .definition-class
.: .constant .variable .user-variable
.defer .other ;
\ *** Block No. 19 Hexblock 13
\ Top level of Decompiler ks 20dez87
external
: ((see ( cfa -)
#spaces off cr
dup dup @
definition-class .definition-class .immediate ;
' ((see Is (see
Forth definitions
: see ' (see ;
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