X-Git-Url: https://thelambdalab.xyz/gitweb/index.cgi?a=blobdiff_plain;f=scheme.4th;h=7626be8f14da773387cdf2a3b821399ce2c157ef;hb=aad554fc41d2b418e63b4320e8f793f28ffac6bf;hp=74a5b45d939c2ab5b12c7cd6955e20f61967082c;hpb=5241c399e654d473a6e86135937ed7af7965d0a2;p=scheme.forth.jl.git diff --git a/scheme.4th b/scheme.4th index 74a5b45..7626be8 100644 --- a/scheme.4th +++ b/scheme.4th @@ -11,6 +11,8 @@ defer read defer eval defer print +defer collect-garbage + \ ------ Types ------ variable nexttype @@ -30,12 +32,14 @@ make-type pair-type make-type symbol-type make-type primitive-proc-type make-type compound-proc-type +make-type fileport-type : istype? ( obj type -- obj bool ) over = ; -\ ------ Cons cell memory ------ {{{ +\ ------ List-structured memory ------ {{{ + +10000 constant scheme-memsize -1000 constant scheme-memsize create car-cells scheme-memsize allot create car-type-cells scheme-memsize allot create cdr-cells scheme-memsize allot @@ -53,11 +57,14 @@ variable nextfree : inc-nextfree nextfrees nextfree @ + @ + nextfree ! - dup scheme-memsize < if - nextfree ! - else - bold fg red + nextfree @ scheme-memsize >= if + collect-garbage + then + + nextfree @ scheme-memsize >= if + fg red bold ." Out of memory! Aborting." reset-term abort then @@ -133,68 +140,34 @@ variable nextfree \ }}} -\ ---- Garbage Collection ---- {{{ - -variable gc-enabled -false gc-enabled ! - -: enable-gc - true gc-enabled ! ; +\ ---- Port I/O ---- {{{ -: disable-gc - false gc-enabled ! ; +: fileport>fid ( fileport -- fid ) + drop ; -: gc-enabled? - gc-enabled @ ; +: fid>fileport ( fid -- fileport ) + fileport-type ; -: pairlike? ( obj -- obj bool ) - pair-type istype? if true exit then - string-type istype? if true exit then - symbol-type istype? if true exit then - compound-proc-type istype? if true exit then - - false +: open-input-file ( addr n -- fileport ) + r/o open-file drop fid>fileport ; -: pairlike-marked? ( obj -- obj bool ) - over nextfrees + @ 0= +: close-port ( fileport -- ) + fileport>fid close-file drop ; -: mark-pairlike ( obj -- obj ) - over nextfrees + 0 swap ! -; +objvar console-i/o-port +0 fileport-type console-i/o-port obj! -: gc-unmark ( -- ) - scheme-memsize 0 do - 1 nextfrees i + ! - loop -; +objvar current-input-port +console-i/o-port obj@ current-input-port obj! -defer gc-mark-trace -: gc-mark-obj ( obj -- ) +: read-port ( fileport -- obj ) + current-input-port obj! + read ; - gc-mark-trace - - pairlike? invert if 2drop exit then - pairlike-marked? if 2drop exit then - - mark-pairlike - - drop pair-type 2dup - - car recurse - cdr recurse -; - -: gc-sweep - scheme-memsize nextfree ! - 0 scheme-memsize 1- do - nextfrees i + @ 0<> if - nextfree @ nextfrees i + ! - i nextfree ! - then - -1 +loop -; +: read-console ( -- obj ) + console-i/o-port obj@ read-port ; \ }}} @@ -262,7 +235,7 @@ objvar symbol-table ; -: (create-symbol) ( addr n -- symbol-obj ) +: cstr>charlist ( addr n -- symbol-obj ) dup 0= if 2drop nil else @@ -278,7 +251,7 @@ objvar symbol-table bl word count - (create-symbol) + cstr>charlist drop symbol-type 2dup @@ -419,61 +392,6 @@ global-env obj! \ }}} -\ ---- Primitives ---- {{{ - -: make-primitive ( cfa -- ) - bl word - count - - \ 2dup ." Defining primitive " type ." ..." cr - - (create-symbol) - drop symbol-type - - 2dup - - symbol-table obj@ - cons - symbol-table obj! - - rot primitive-proc-type ( var prim ) - global-env obj@ define-var -; - -: arg-count-error - bold fg red ." Incorrect argument count." reset-term cr - abort -; - -: ensure-arg-count ( args n -- ) - dup 0= if - drop nil objeq? false = if - arg-count-error - then - else - -rot 2dup nil objeq? if - arg-count-error - then - - cdr rot 1- recurse - then -; - -: arg-type-error - bold fg red ." Incorrect argument type." reset-term cr - abort -; - -: ensure-arg-type ( arg type -- arg ) - istype? false = if - arg-type-error - then -; - -include scheme-primitives.4th - -\ }}} - \ ---- Read ---- {{{ variable parse-idx @@ -502,13 +420,24 @@ parse-idx-stack parse-idx-sp ! '\n' parse-str parse-str-span @ + ! 1 parse-str-span +! ; +: append-eof + 4 parse-str parse-str-span @ + ! + 1 parse-str-span +! ; + : empty-parse-str 0 parse-str-span ! 0 parse-idx ! ; : getline - parse-str 160 expect cr - span @ parse-str-span ! + current-input-port obj@ console-i/o-port obj@ objeq? if + parse-str 160 expect cr + span @ parse-str-span ! + else + parse-str 160 current-input-port obj@ fileport>fid read-line + drop swap parse-str-span ! + + parse-str-span @ 0= and if append-eof then + then append-newline 0 parse-idx ! ; @@ -525,12 +454,16 @@ parse-idx-stack parse-idx-sp ! charavailable? false = if getline then parse-str parse-idx @ + @ ; +: '\t' 9 ; : whitespace? ( -- bool ) nextchar BL = - nextchar '\n' = or ; + nextchar '\n' = + nextchar '\t' = + or or ; +: EOF 4 ; : eof? ( -- bool ) - nextchar 4 = ; + nextchar EOF = ; : delim? ( -- bool ) whitespace? @@ -748,7 +681,7 @@ parse-idx-stack parse-idx-sp ! realnum-type ; -: readbool ( -- bool-atom ) +: readbool ( -- bool-obj ) inc-parse-idx nextchar [char] f = if @@ -762,7 +695,7 @@ parse-idx-stack parse-idx-sp ! boolean-type ; -: readchar ( -- char-atom ) +: readchar ( -- char-obj ) inc-parse-idx inc-parse-idx @@ -925,9 +858,9 @@ parse-idx-stack parse-idx-sp ! then eof? if + EOF character-type inc-parse-idx - bold fg blue ." Moriturus te saluto." reset-term cr - quit + exit then \ Anything else is parsed as a symbol @@ -1301,35 +1234,70 @@ parse-idx-stack parse-idx-sp ! \ }}} -\ ---- DEBUGGING ---- {{{ +\ ---- Garbage Collection ---- {{{ -false value debug-mode +variable gc-enabled +false gc-enabled ! -:noname - debug-mode if - ." Object: " 2dup cr print cr - ." Pairlike: " pairlike? if - ." TRUE" - pairlike-marked? if - ." (Marked)" - else - ." (Unmarked)" - then - else - ." FALSE" - then - cr ." [paused]" - key drop cr - then -; is gc-mark-trace +variable gc-stack-depth -: gc-mark-sweep - gc-unmark - symbol-table obj@ gc-mark-obj - global-env obj@ gc-mark-obj - gc-sweep +: enable-gc + depth gc-stack-depth ! + true gc-enabled ! ; + +: disable-gc + false gc-enabled ! ; + +: gc-enabled? + gc-enabled @ ; + +: pairlike? ( obj -- obj bool ) + pair-type istype? if true exit then + string-type istype? if true exit then + symbol-type istype? if true exit then + compound-proc-type istype? if true exit then + + false +; + +: pairlike-marked? ( obj -- obj bool ) + over nextfrees + @ 0= ; +: mark-pairlike ( obj -- obj ) + over nextfrees + 0 swap ! +; + +: gc-unmark ( -- ) + scheme-memsize 0 do + 1 nextfrees i + ! + loop +; + +: gc-mark-obj ( obj -- ) + + pairlike? invert if 2drop exit then + pairlike-marked? if 2drop exit then + + mark-pairlike + + drop pair-type 2dup + + car recurse + cdr recurse +; + +: gc-sweep + scheme-memsize nextfree ! + 0 scheme-memsize 1- do + nextfrees i + @ 0<> if + nextfree @ nextfrees i + ! + i nextfree ! + then + -1 +loop +; + +\ Following a GC, this gives the amount of free memory : gc-count-marked 0 scheme-memsize 0 do @@ -1337,6 +1305,7 @@ false value debug-mode loop ; +\ Debugging word - helps spot memory that is retained : gc-zero-unmarked scheme-memsize 0 do nextfrees i + @ 0<> if @@ -1346,8 +1315,125 @@ false value debug-mode loop ; +:noname + \ ." GC! " + + gc-unmark + + symbol-table obj@ gc-mark-obj + global-env obj@ gc-mark-obj + + depth gc-stack-depth @ do + PSP0 i + 1 + @ + PSP0 i + 2 + @ + + gc-mark-obj + 2 +loop + + gc-sweep + + \ ." (" gc-count-marked . ." pairs marked as used.)" cr +; is collect-garbage + \ }}} +\ ---- Primitives ---- {{{ + +: make-primitive ( cfa -- ) + bl word + count + + \ 2dup ." Defining primitive " type ." ..." cr + + cstr>charlist + drop symbol-type + + 2dup + + symbol-table obj@ + cons + symbol-table obj! + + rot primitive-proc-type ( var prim ) + global-env obj@ define-var +; + +: arg-count-error + bold fg red ." Incorrect argument count." reset-term cr + abort +; + +: ensure-arg-count ( args n -- ) + dup 0= if + drop nil objeq? false = if + arg-count-error + then + else + -rot 2dup nil objeq? if + arg-count-error + then + + cdr rot 1- recurse + then +; + +: arg-type-error + bold fg red ." Incorrect argument type." reset-term cr + abort +; + +: ensure-arg-type ( arg type -- arg ) + istype? false = if + arg-type-error + then +; + +include scheme-primitives.4th + +\ }}} + +\ ---- Loading files ---- {{{ + +: charlist>cstr ( charlist addr -- n ) + + dup 2swap ( origaddr addr charlist ) + + begin + 2dup nil objeq? false = + while + 2dup cdr 2swap car + drop ( origaddr addr charlist char ) + -rot 2swap ( origaddr charlist addr char ) + over ! + 1+ -rot ( origaddr nextaddr charlist ) + repeat + + 2drop ( origaddr finaladdr ) + swap - +; + +: load ( addr n -- finalResult ) + open-input-file + + empty-parse-str + + ok-symbol ( port res ) + + begin + 2over read-port ( port res obj ) + + 2dup EOF character-type objeq? if + 2drop 2swap close-port + exit + then + + 2swap 2drop ( port obj ) + + global-env obj@ eval ( port res ) + again +; + +\ }}} \ ---- REPL ---- @@ -1355,12 +1441,18 @@ false value debug-mode cr ." Welcome to scheme.forth.jl!" cr ." Use Ctrl-D to exit." cr - empty-parse-str + enable-gc + begin cr bold fg green ." > " reset-term - read + read-console + + 2dup EOF character-type objeq? if + bold fg blue ." Moriturus te saluto." reset-term cr + exit + then global-env obj@ eval @@ -1368,6 +1460,9 @@ false value debug-mode again ; +: test s" fact.scm" ; +test load 2drop + forth definitions \ vim:fdm=marker