mirror of
https://github.com/forth-ev/VolksForth.git
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409 lines
25 KiB
Forth
409 lines
25 KiB
Forth
\ *** Block No. 0 Hexblock 0
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\ Extended-Decompiler for VolksForth LOAD-SCREEN UH 07Nov86
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Dieses File enthaelt einen Decompiler, der bereits kompilierte
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Worte wieder in Sourcetextform bringt.
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Strukturierte Worte wie IF THEN ELSE, BEGIN WHILE REPEAT UNTIL
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und DO LOOP +LOOP werden in einem an AI-grenzenden Vorgang
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erkannt und umgeformt.
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Ein Decompiler kann aber keine (Stack-) Kommentare wieder
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herzaubern, die Benutzung der Screens und dann view, wird
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daher staerkstens empfohlen.
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Denn: Es ist immernoch ein Fehler drin!
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Und um den zu korrigieren, ist der Sourcetext dem Objektkode
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doch vorzuziehen.
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Benutzung: see <name>
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\ *** Block No. 1 Hexblock 1
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\ Extended-Decompiler for VolksForth LOAD-SCREEN 07Nov86
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Onlyforth Tools also definitions
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1 13 +thru
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\\
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Produces compilable Forth source from normal compiled Forth.
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These source blocks are based on the works of
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Henry Laxen, Mike Perry and Wil Baden
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volksFORTH version: U. Hoffmann
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\ *** Block No. 2 Hexblock 2
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\ detacting does> 01Jul86
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internal
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' does> 4+ @ Alias (;code
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' Forth @ 1+ @ Constant (dodoes>
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: does? ( IP - f )
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dup c@ $CD ( call ) = swap
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1+ @ (dodoes> = and ;
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\ *** Block No. 3 Hexblock 3
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\ indentation. 04Jul86
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Variable #spaces #spaces off
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: +in ( -- ) 3 #spaces +! ;
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: -in ( -- ) -3 #spaces +! ;
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: ind-cr ( -- ) ( col #spaces @ = ?exit ) cr #spaces @ spaces ;
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: ?ind-cr ( -- ) col c/l u> IF ind-cr THEN ;
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\ *** Block No. 4 Hexblock 4
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\ case defining words 01Jul86
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: Case: ( -- )
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Create: Does> swap 2* + perform ;
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: Associative: ( n -- )
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Constant Does> ( n - index )
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dup @ -rot dup @ 0
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DO 2+ 2dup @ =
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IF 2drop drop I 0 0 LEAVE THEN LOOP 2drop ;
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\ *** Block No. 5 Hexblock 5
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\ branching 04Jul86
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Variable #branches Variable #branch
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: branch-type ( n -- a ) 6 * pad + ;
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: branch-from ( n -- a ) branch-type 2+ ;
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: branch-to ( n -- a ) branch-type 4+ ;
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: branched ( adr type -- ) \ Make entry in branch-table.
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#branches @ branch-type ! dup #branches @ branch-from !
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2+ dup @ + #branches @ branch-to ! 1 #branches +! ;
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\\ branch-table: { type0|from0|to0 | type1|from1|to1 ... }
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\ *** Block No. 6 Hexblock 6
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\ branching 01Jul86
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: branch-back ( adr type -- )
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\ : make entry in branch-table & reclassify branch-type.)
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over swap branched
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2+ dup dup @ + swap 2+ ( loop-start,-end.)
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0 #branches @ 1-
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?DO
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over I branch-from @ u> IF LEAVE THEN
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dup I branch-to @ = IF ['] while I branch-type ! THEN
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-1 +LOOP 2drop ;
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\ *** Block No. 7 Hexblock 7
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\ branching 01Jul86
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: forward? ( ip -- f ) 2+ @ 0> ;
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: ?branch+ ( ip -- ip' ) dup 4+ swap dup forward?
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IF ['] if branched exit THEN ['] until branch-back ;
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: branch+ ( ip -- ip' ) dup 4+ swap dup forward?
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IF ['] else branched exit THEN ['] repeat branch-back ;
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: (loop)+ ( ip -- ip' )
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dup dup @ ( loop,+loop ) branch-back -1 #branches +! 4+ ;
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: string+ ( ip -- ip' ) 2+ count + even ;
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: (;code+ ( ip -- ip' ) 2+ dup does? not IF 0= exit THEN 3+ ;
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\ *** Block No. 8 Hexblock 8
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\ classify each word 25Aug86
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Forth
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&15 Associative: execution-class
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] clit lit ?branch branch
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(do (." (abort" (;code
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(" (?do (loop
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(+loop unnest (is compile [
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Case: execution-class+
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3+ 4+ ?branch+ branch+
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2+ string+ string+ (;code+
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string+ 2+ 4+
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4+ 0= 4+ 4+ 2+ ;
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Tools
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\ *** Block No. 9 Hexblock 9
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\ first pass 01Jul86
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: pass1 ( cfa -- ) #branches off >body
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BEGIN dup @ execution-class execution-class+
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dup 0= stop? or
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UNTIL drop ;
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\ *** Block No. 10 Hexblock A
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\ identify branch destinations. 04Jul86
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: thru.branchtable ( -- limit start ) #branches @ 0 ;
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: ?.then ( ip -- ) thru.branchtable
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?DO I branch-to @ over =
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IF I branch-from @ over u<
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IF I branch-type @ dup ['] else = swap ['] if = or
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IF -in ." THEN " ind-cr LEAVE THEN THEN THEN
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LOOP ;
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: ?.begin ( ip -- ) thru.branchtable
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?DO I branch-to @ over =
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IF I branch-from @ over u< not
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IF I branch-type @ dup
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['] repeat = swap ['] until = or
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IF ind-cr ." BEGIN " +in LEAVE THEN THEN THEN
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LOOP ;
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( put "BEGIN" and "THEN" where used.)
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\ *** Block No. 11 Hexblock B
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\ decompile each type of word 01Jul86
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: .word ( ip -- ip' ) dup @ >name .name 2+ ;
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: .(word ( ip -- ip' ) dup @ >name
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?dup 0= IF ." ??? " ELSE
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count $1f and swap 1+ swap 1- type space THEN 2+ ;
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: .inline ( val16b -- )
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dup >name ?dup IF ." ['] " .name drop exit THEN . ;
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: .lit ( ip -- ip' ) 2+ dup @ .inline 2+ ?.then ;
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: .clit ( ip -- ip' ) 2+ dup c@ . 1+ ?.then ;
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: .string ( ip -- ip' )
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.(word count 2dup type Ascii " emit space + even ?.then ;
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: .unnest ( ip -- 0 ) ." ; " 0= ;
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\ *** Block No. 12 Hexblock C
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\ decompile each type of word 01Jul86
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: .default ( ip -- ip' ) dup @ >name ?dup IF
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c@ $40 and IF ." [COMPILE] " THEN THEN .word ?.then ;
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: .['] ( ip -- ip' ) .(word dup @ 2- >name .name 2+ ?.then ;
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: .compile ( ip -- ip' ) .word .word ?.then ;
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\ *** Block No. 13 Hexblock D
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\ decompiling conditionals 04Jul86
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: .if ( ip nfa -- ip' ) ind-cr .name +in 4+ ?.then ;
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: .repeat ( ip nfa -- ip' ) -in .name ind-cr 4+ ?.then ;
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: .else ( ip nfa -- ip' ) -in ind-cr .name +in 4+ ;
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: .do ( ip nfa -- ip' ) ind-cr .(word +in 2+ ?.then ;
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: .loop ( ip nfa -- ip' ) -in .(word ind-cr 2+ ?.then ;
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5 Associative: branch-class
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' if , ' while , ' else , ' repeat , ' until ,
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Case: .branch-class
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.if .else .else .repeat .repeat ;
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: .branch ( ip -- ip' )
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#branch @ branch-type @ 1 #branch +!
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dup >name swap branch-class .branch-class ;
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\ *** Block No. 14 Hexblock E
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\ decompile Does> ;code 04Jul86
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: .(;code ( IP - IP' f)
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2+ dup does?
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IF ind-cr ." DOES> " 3+ ELSE ." ;CODE " 0= THEN ;
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\ *** Block No. 15 Hexblock F
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\ classify word's output 01Jul86
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Case: .execution-class
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.clit .lit .branch .branch
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.do .string .string .(;code
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.string .do .loop
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.loop .unnest .['] .compile
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.default ;
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\ *** Block No. 16 Hexblock 10
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\ decompile colon-definitions 04Jul86
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: pass2 ( cfa -- ) #branch off >body
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BEGIN ?.begin ?ind-cr dup @ execution-class .execution-class
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dup 0= stop? or
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UNTIL drop ;
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: .pfa ( cfa -- ) #spaces off +in dup pass1 pass2 ;
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: .immediate ( cfa - ) >name c@ dup
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?ind-cr 40 and IF ." IMMEDIATE " THEN
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?ind-cr 80 and IF ." RESTRICT" THEN ;
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: .: ( cfa - ) ." : " dup >name .name 3 spaces .pfa ;
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\ *** Block No. 17 Hexblock 11
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\ display category of word 01Jul86
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external Defer (see internal
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: .does> ( cfa - ) ." DOES> " @ 1+ .pfa ;
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: .user-variable ( cfa - ) ." USER " dup >name dup .name
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3 spaces swap execute @ u. .name ." ! " ;
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: .defer ( cfa - )
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." deferred " dup >name .name ." Is " >body @ (see ;
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: .other ( cfa - ) dup >name .name
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dup @ over >body = IF drop ." is Code " exit THEN
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dup @ does? IF .does> exit THEN
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drop ." is unknown " ;
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\ *** Block No. 18 Hexblock 12
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\ decompiling variables and constants 01Jul86
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: .constant ( cfa - )
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dup >body @ u. ." CONSTANT " >name .name ;
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: .variable ( cfa - ) ." VARIABLE "
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dup >name dup .name 3 spaces swap >body @ u. .name ." ! " ;
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\ *** Block No. 19 Hexblock 13
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\ classify a word UH 25Jan88
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5 Associative: definition-class
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' quit @ , ' 0 @ , ' scr @ , ' base @ ,
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' 'cold @ ,
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Case: .definition-class
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.: .constant .variable .user-variable
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.defer .other ;
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\ *** Block No. 20 Hexblock 14
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\ Top level of Decompiler 04Jul86
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external
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: ((see ( cfa -)
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#spaces off cr
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dup dup @
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definition-class .definition-class .immediate ;
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' ((see Is (see
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Forth definitions
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: see ' (see ;
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\ *** Block No. 21 Hexblock 15
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\ *** Block No. 22 Hexblock 16
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\ *** Block No. 23 Hexblock 17
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