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033892777a
See issue #587. * Merge eval-ast and eval into a single conditional. * Expand macros during the apply phase, removing lots of duplicate tests, and increasing the overall consistency by allowing the macro to be computed instead of referenced by name (`((defmacro! cond (...)))` is currently illegal for example). * Print "EVAL: $ast" at the top of EVAL if DEBUG-EVAL exists in the MAL environment. * Remove macroexpand and quasiquoteexpand special forms. * Use pattern-matching style in process/step*.txt. Unresolved issues: c.2: unable to reproduce with gcc 11.12.0. elm: the directory is unchanged. groovy: sometimes fail, but not on each rebuild. nasm: fails some new soft tests, but the issue is unreproducible when running the interpreter manually. objpascal: unreproducible with fpc 3.2.2. ocaml: unreproducible with 4.11.1. perl6: unreproducible with rakudo 2021.09. Unrelated changes: Reduce diff betweens steps. Prevent defmacro! from mutating functions: c forth logo miniMAL vb. dart: fix recent errors and warnings ocaml: remove metadata from symbols. Improve the logo implementation. Encapsulate all representation in types.lg and env.lg, unwrap numbers. Replace some manual iterations with logo control structures. Reduce the diff between steps. Use native iteration in env_get and env_map Rewrite the reader with less temporary strings. Reduce the number of temporary lists (for example, reverse iteration with butlast requires O(n^2) allocations). It seems possible to remove a few exceptions: GC settings (Dockerfile), NO_SELF_HOSTING (IMPLS.yml) and step5_EXCLUDES (Makefile.impls) .
429 lines
11 KiB
Forth
429 lines
11 KiB
Forth
require reader.fs
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require printer.fs
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require core.fs
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core MalEnv. constant repl-env
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99999999 constant TCO-eval
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: read read-str ;
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s" DEBUG-EVAL" MalSymbol. constant debug-eval-sym
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: eval ( env obj )
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begin
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over debug-eval-sym swap env/get-addr ?dup-if
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@ dup mal-false <> swap mal-nil <> and if
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." EVAL: " dup pr-str safe-type cr
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endif
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endif
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mal-eval
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dup TCO-eval =
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while
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drop
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repeat ;
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: print
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\ ." Type: " dup mal-type @ type-name safe-type cr
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pr-str ;
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MalDefault extend mal-eval nip ;; drop \ By default, evalutate to yourself
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MalKeyword
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extend eval-invoke { env list kw -- val }
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0 kw env list MalList/start @ cell+ @ eval get
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?dup 0= if
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\ compute not-found value
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list MalList/count @ 1 > if
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env list MalList/start @ 2 cells + @ TCO-eval
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else
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mal-nil
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endif
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endif ;;
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extend invoke { argv argc kw -- val }
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0 kw argv @ get
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?dup 0= if
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argc 1 > if
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argv cell+ @
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else
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mal-nil
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endif
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endif ;;
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drop
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\ eval all but the first item of list
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: eval-rest { env list -- argv argc }
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list MalList/start @ cell+ { expr-start }
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list MalList/count @ 1- { argc }
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argc cells allocate throw { target }
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argc 0 ?do
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env expr-start i cells + @ eval
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target i cells + !
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loop
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target argc ;
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MalNativeFn
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extend eval-invoke { env list this -- list }
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env list eval-rest ( argv argc )
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this invoke ;;
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extend invoke ( argv argc this -- val )
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MalNativeFn/xt @ execute ;;
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drop
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SpecialOp
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extend eval-invoke ( env list this -- list )
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SpecialOp/xt @ execute ;;
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drop
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: install-special ( symbol xt )
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SpecialOp. repl-env env/set ;
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: defspecial
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parse-allot-name MalSymbol.
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['] install-special
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:noname
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;
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defspecial quote ( env list -- form )
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nip MalList/start @ cell+ @ ;;
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s" concat" MalSymbol. constant concat-sym
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s" cons" MalSymbol. constant cons-sym
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s" vec" MalSymbol. constant vec-sym
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defer quasiquote
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( If the list has two elements and the first is sym, return the second )
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( element and true, else return the list unchanged and false. )
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: qq_extract_unquote ( list symbol -- form f )
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over MalList/count @ 2 = if
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over MalList/start @ tuck @ m= if ( list start - )
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cell+ @
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nip
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true
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exit
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endif
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endif
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drop
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false ;
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( Transition function for the following quasiquote folder. )
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: qq_loop ( acc elt -- form )
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dup mal-type @ MalList = if
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splice-unquote-sym qq_extract_unquote if
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here concat-sym , swap , swap , here>MalList
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exit
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endif
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endif
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quasiquote
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here cons-sym , swap , swap , here>MalList ;
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( Right-fold quasiquoting each element of a list. )
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: qq_foldr ( list -- form )
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dup MalList/count @ if
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dup MalList/rest recurse
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swap MalList/start @ @
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qq_loop
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endif ;
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: quasiquote0 ( ast -- form )
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dup mal-type @ case
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MalList of
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unquote-sym qq_extract_unquote if
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( the work is already done )
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else
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qq_foldr
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endif
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endof
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MalVector of
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MalVector/list @ qq_foldr
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here vec-sym , swap , here>MalList
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endof
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MalSymbol of
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here quote-sym , swap , here>MalList
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endof
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MalMap of
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here quote-sym , swap , here>MalList
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endof
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( other types are returned unchanged )
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endcase ;
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' quasiquote0 is quasiquote
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defspecial quasiquote ( env list )
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MalList/start @ cell+ @ ( ast )
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quasiquote TCO-eval ;;
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defspecial def! { env list -- val }
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list MalList/start @ cell+ { arg0 }
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arg0 @ ( key )
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env arg0 cell+ @ eval dup { val } ( key val )
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env env/set val ;;
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defspecial defmacro! { env list -- val }
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list MalList/start @ cell+ { arg0 }
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arg0 @ ( key )
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env arg0 cell+ @ eval
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asMacro { val }
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val env env/set
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val ;;
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defspecial let* { old-env list -- val }
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old-env MalEnv. { env }
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list MalList/start @ cell+ dup { arg0 }
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@ to-list
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dup MalList/start @ { bindings-start } ( list )
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MalList/count @ 0 +do
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bindings-start i cells + dup @ swap cell+ @ ( sym expr )
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env swap eval
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env env/set
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2 +loop
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env arg0 cell+ @ TCO-eval
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\ TODO: dec refcount of env
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;;
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defspecial do { env list -- val }
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list MalList/start @ { start }
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list MalList/count @ dup 1- { last } 1 ?do
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env start i cells + @
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i last = if
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TCO-eval
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else
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eval drop
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endif
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loop ;;
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defspecial if { env list -- val }
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list MalList/start @ cell+ { arg0 }
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env arg0 @ eval ( test-val )
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dup mal-false = if
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drop -1
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else
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mal-nil =
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endif
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if
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\ branch to false
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list MalList/count @ 3 > if
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env arg0 cell+ cell+ @ TCO-eval
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else
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mal-nil
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endif
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else
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\ branch to true
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env arg0 cell+ @ TCO-eval
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endif ;;
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s" &" MalSymbol. constant &-sym
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: new-user-fn-env { argv argc mal-fn -- env }
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mal-fn MalUserFn/formal-args @ { f-args-list }
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mal-fn MalUserFn/env @ MalEnv. { env }
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f-args-list MalList/start @ { f-args }
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f-args-list MalList/count @ ?dup 0= if else
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\ pass empty list for last arg, unless overridden below
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1- cells f-args + @ MalList new env env/set
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endif
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argc 0 ?do
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f-args i cells + @
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dup &-sym m= if
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drop
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argc i - { c }
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c cells allocate throw { start }
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argv i cells + start c cells cmove
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f-args i 1+ cells + @ ( more-args-symbol )
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start c MalList. env env/set
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leave
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endif
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argv i cells + @
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env env/set
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loop
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env ;
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MalUserFn
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extend eval-invoke { call-env list mal-fn -- list }
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mal-fn MalUserFn/is-macro? @ if
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list MalList/start @ cell+ \ argv
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list MalList/count @ 1- \ argc
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mal-fn new-user-fn-env { env }
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env mal-fn MalUserFn/body @ eval
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call-env swap TCO-eval
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else
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call-env list eval-rest
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mal-fn invoke
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endif ;;
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extend invoke ( argv argc mal-fn )
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dup { mal-fn } new-user-fn-env { env }
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env mal-fn MalUserFn/body @ TCO-eval ;;
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drop
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defspecial fn* { env list -- val }
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list MalList/start @ cell+ { arg0 }
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MalUserFn new
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false over MalUserFn/is-macro? !
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env over MalUserFn/env !
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arg0 @ to-list over MalUserFn/formal-args !
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arg0 cell+ @ over MalUserFn/body ! ;;
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5555555555 constant pre-try
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defspecial try* { env list -- val }
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list MalList/start @ cell+ { arg0 }
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list MalList/count @ 3 < if
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env arg0 @ eval
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else
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pre-try
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env arg0 @ ['] eval catch ?dup 0= if
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nip
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else { errno }
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begin pre-try = until
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errno 1 <> if
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s" forth-errno" MalKeyword. errno MalInt. MalMap/Empty assoc
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to exception-object
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endif
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arg0 cell+ @ ( list[catch*,sym,form] )
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MalList/start @ cell+ { catch0 }
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env MalEnv. { catch-env }
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catch0 @ exception-object catch-env env/set
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catch-env catch0 cell+ @ TCO-eval
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endif
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endif ;;
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defspecial . { env coll -- rtn-list }
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depth { old-depth }
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coll to-list dup MalList/count @ swap MalList/start @ { count start }
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count cells start + start cell+ +do
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env i @ eval as-native
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cell +loop ;;
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MalSymbol
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extend mal-eval { env sym -- val }
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sym env env/get-addr
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dup 0= if
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drop
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0 0 s" ' not found" sym pr-str s" '" ...throw-str
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else
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@
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endif ;;
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drop
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: eval-ast { env list -- list }
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here
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list MalList/start @ { expr-start }
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list MalList/count @ 0 ?do
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env expr-start i cells + @ eval ,
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loop
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here>MalList ;
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MalList
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extend mal-eval { env list -- val }
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list MalList/count @ 0= if
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list
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else
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env list MalList/start @ @ eval
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env list rot eval-invoke
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endif ;;
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drop
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MalVector
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extend mal-eval ( env vector -- vector )
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MalVector/list @ eval-ast
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MalVector new swap over MalVector/list ! ;;
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drop
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MalMap
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extend mal-eval ( env map -- map )
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MalMap/list @ eval-ast
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MalMap new swap over MalMap/list ! ;;
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drop
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defcore eval ( argv argc )
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drop @ repl-env swap eval ;;
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: rep ( str-addr str-len -- str-addr str-len )
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read
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repl-env swap eval
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print ;
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: mk-args-list ( -- )
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here
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begin
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next-arg 2dup 0 0 d<> while
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MalString. ,
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repeat
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2drop here>MalList ;
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create buff 128 allot
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77777777777 constant stack-leak-detect
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: nop ;
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defcore swap! { argv argc -- val }
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\ argv is (atom fn args...)
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argv @ { atom }
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argv cell+ @ { fn }
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argc 1- { call-argc }
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call-argc cells allocate throw { call-argv }
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atom Atom/val call-argv 1 cells cmove
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argv cell+ cell+ call-argv cell+ call-argc 1- cells cmove
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call-argv call-argc fn invoke
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dup TCO-eval = if drop eval endif { new-val }
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new-val atom Atom/val !
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new-val ;;
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defcore map ( argv argc -- list )
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drop dup @ swap cell+ @ to-list { fn list }
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here
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list MalList/start @ list MalList/count @ cells over + swap +do
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i 1 fn invoke
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dup TCO-eval = if drop eval endif
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,
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cell +loop
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here>MalList ;;
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s\" (def! *host-language* \"forth\")" rep 2drop
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s\" (def! not (fn* (x) (if x false true)))" rep 2drop
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s\" (def! load-file (fn* (f) (eval (read-string (str \"(do \" (slurp f) \"\nnil)\")))))" rep 2drop
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s\" (defmacro! cond (fn* (& xs) (if (> (count xs) 0) (list 'if (first xs) (if (> (count xs) 1) (nth xs 1) (throw \"odd number of forms to cond\")) (cons 'cond (rest (rest xs)))))))" rep 2drop
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: repl ( -- )
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s\" (println (str \"Mal [\" *host-language* \"]\"))" rep 2drop
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begin
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." user> "
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stack-leak-detect
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buff 128 stdin read-line throw
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while ( num-bytes-read )
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dup 0 <> if
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buff swap ( str-addr str-len )
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['] rep
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\ execute ['] nop \ uncomment to see stack traces
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catch ?dup 0= if
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safe-type cr
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stack-leak-detect <> if ." --stack leak--" cr endif
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else { errno }
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begin stack-leak-detect = until
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errno 1 <> if
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s" forth-errno" MalKeyword. errno MalInt. MalMap/Empty assoc
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to exception-object
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endif
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." Uncaught exception: "
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exception-object pr-str safe-type cr
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endif
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endif
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repeat ;
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: main ( -- )
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mk-args-list { args-list }
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args-list MalList/count @ 0= if
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s" *ARGV*" MalSymbol. MalList/Empty repl-env env/set
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repl
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else
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args-list MalList/start @ @ { filename }
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s" *ARGV*" MalSymbol. args-list MalList/rest repl-env env/set
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repl-env
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here s" load-file" MalSymbol. , filename , here>MalList
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eval print
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endif ;
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main
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cr
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bye
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