\ compiler definitions 14sep97jaw
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\ \ Revisions-Log
\ put in seperate file 14sep97jaw
\ \ here allot , c, A, 17dec92py
[IFUNDEF] allot
[IFUNDEF] forthstart
: allot ( n -- ) \ core
\G Reserve or release @var{n} address units of data space; @var{n}
\G is a signed number. There are restrictions on releasing data
\G space.
dup unused u> -8 and throw
dp +! ;
[THEN]
[THEN]
\ we default to this version if we have nothing else 05May99jaw
[IFUNDEF] allot
: allot ( n -- ) \ core
\G Reserve or release @var{n} address units of data space; @var{n}
\G is a signed number. There are restrictions on releasing data
\G space.
here +
dup 1- usable-dictionary-end forthstart within -8 and throw
dp ! ;
[THEN]
: c, ( c -- ) \ core
\G Reserve data space for one char and store @var{c} in the space.
here 1 chars allot c! ;
: , ( w -- ) \ core
\G Reserve data space for one cell and store @var{w} in the space.
here cell allot ! ;
: 2, ( w1 w2 -- ) \ gforth
\G Reserve data space for two cells and store the double @var{w1
\G w2} in the space.
here 2 cells allot 2! ;
\ : aligned ( addr -- addr' ) \ core
\ [ cell 1- ] Literal + [ -1 cells ] Literal and ;
: align ( -- ) \ core
here dup aligned swap ?DO bl c, LOOP ;
\ : faligned ( addr -- f-addr ) \ float
\ [ 1 floats 1- ] Literal + [ -1 floats ] Literal and ;
: falign ( -- ) \ float
here dup faligned swap
?DO
bl c,
LOOP ;
: maxalign ( -- ) \ gforth
here dup maxaligned swap
?DO
bl c,
LOOP ;
\ the code field is aligned if its body is maxaligned
' maxalign Alias cfalign ( -- ) \ gforth
' , alias A, ( addr -- ) \ gforth
' NOOP ALIAS const
\ \ Header 23feb93py
\ input-stream, nextname and noname are quite ugly (passing
\ information through global variables), but they are useful for dealing
\ with existing/independent defining words
defer (header)
defer header ( -- ) \ gforth
' (header) IS header
: string, ( c-addr u -- ) \ gforth
\G puts down string as cstring
dup c, here swap chars dup allot move ;
: header, ( c-addr u -- ) \ gforth
name-too-long?
align here last !
current @ 1 or A, \ link field; before revealing, it contains the
\ tagged reveal-into wordlist
string, cfalign
alias-mask lastflags cset ;
: input-stream-header ( "name" -- )
name name-too-short? header, ;
: input-stream ( -- ) \ general
\G switches back to getting the name from the input stream ;
['] input-stream-header IS (header) ;
' input-stream-header IS (header)
\ !! make that a 2variable
create nextname-buffer 32 chars allot
: nextname-header ( -- )
nextname-buffer count header,
input-stream ;
\ the next name is given in the string
: nextname ( c-addr u -- ) \ gforth
name-too-long?
nextname-buffer c! ( c-addr )
nextname-buffer count move
['] nextname-header IS (header) ;
: noname-header ( -- )
0 last ! cfalign
input-stream ;
: noname ( -- ) \ gforth
\ the next defined word remains anonymous. The xt of that word is given by lastxt
['] noname-header IS (header) ;
: lastxt ( -- xt ) \ gforth
\G @var{xt} is the execution token of the last word defined.
\ The main purpose of this word is to get the xt of words defined using noname
lastcfa @ ;
\ \ literals 17dec92py
: Literal ( compilation n -- ; run-time -- n ) \ core
\G Compile appropriate code such that, at run-time, @var{n} is placed
\G on the stack. Interpretation semantics are undefined.
[ [IFDEF] lit, ]
lit,
[ [ELSE] ]
postpone lit ,
[ [THEN] ] ; immediate restrict
: ALiteral ( compilation addr -- ; run-time -- addr ) \ gforth
[ [IFDEF] alit, ]
alit,
[ [ELSE] ]
postpone lit A,
[ [THEN] ] ; immediate restrict
: char ( '<spaces>ccc' -- c ) \ core
\G Skip leading spaces. Parse the string @var{ccc} and return @var{c}, the
\G display code representing the first character of @var{ccc}.
bl word char+ c@ ;
: [char] ( compilation '<spaces>ccc' -- ; run-time -- c ) \ core bracket-char
\G Compilation: skip leading spaces. Parse the string
\G @var{ccc}. Run-time: return @var{c}, the display code
\G representing the first character of @var{ccc}. Interpretation
\G semantics for this word are undefined.
char postpone Literal ; immediate restrict
\ \ threading 17mar93py
: cfa, ( code-address -- ) \ gforth cfa-comma
here
dup lastcfa !
0 A, 0 , code-address! ;
[IFUNDEF] compile,
: compile, ( xt -- ) \ core-ext compile-comma
\G Compile the word represented by the execution token, @var{xt}.
A, ;
[THEN]
: !does ( addr -- ) \ gforth store-does
lastxt does-code! ;
: (does>) ( R: addr -- )
r> cfaligned /does-handler + !does ;
: dodoes, ( -- )
cfalign here /does-handler allot does-handler! ;
: (compile) ( -- ) \ gforth
r> dup cell+ >r @ compile, ;
: postpone, ( w xt -- ) \ gforth postpone-comma
\g Compile the compilation semantics represented by @var{w xt}.
dup ['] execute =
if
drop compile,
else
dup ['] compile, =
if
drop POSTPONE (compile) a,
else
swap POSTPONE aliteral compile,
then
then ;
: POSTPONE ( "name" -- ) \ core
\g Compiles the compilation semantics of @var{name}.
COMP' postpone, ; immediate restrict
struct
>body
cell% field interpret/compile-int
cell% field interpret/compile-comp
end-struct interpret/compile-struct
: interpret/compile: ( interp-xt comp-xt "name" -- ) \ gforth
Create immediate swap A, A,
DOES>
abort" executed primary cfa of an interpret/compile: word" ;
\ state @ IF cell+ THEN perform ;
\ \ ticks
: name>comp ( nt -- w xt ) \ gforth
\G @var{w xt} is the compilation token for the word @var{nt}.
(name>comp)
1 = if
['] execute
else
['] compile,
then ;
: [(')] ( compilation "name" -- ; run-time -- nt ) \ gforth bracket-paren-tick
(') postpone ALiteral ; immediate restrict
: ['] ( compilation. "name" -- ; run-time. -- xt ) \ core bracket-tick
\g @var{xt} represents @var{name}'s interpretation
\g semantics. Performs @code{-14 throw} if the word has no
\g interpretation semantics.
' postpone ALiteral ; immediate restrict
: COMP' ( "name" -- w xt ) \ gforth comp-tick
\g @var{w xt} represents @var{name}'s compilation semantics.
(') name>comp ;
: [COMP'] ( compilation "name" -- ; run-time -- w xt ) \ gforth bracket-comp-tick
\g @var{w xt} represents @var{name}'s compilation semantics.
COMP' swap POSTPONE Aliteral POSTPONE ALiteral ; immediate restrict
\ \ recurse 17may93jaw
: recurse ( compilation -- ; run-time ?? -- ?? ) \ core
\g Call the current definition.
lastxt compile, ; immediate restrict
\ \ compiler loop
: compiler ( c-addr u -- )
2dup find-name dup
if ( c-addr u nt )
nip nip name>comp execute
else
drop
2dup snumber? dup
IF
0>
IF
swap postpone Literal
THEN
postpone Literal
2drop
ELSE
drop compiler-notfound
THEN
then ;
: [ ( -- ) \ core left-bracket
\G Enter interpretation state. Immediate word.
['] interpreter IS parser state off ; immediate
: ] ( -- ) \ core right-bracket
\G Enter compilation state.
['] compiler IS parser state on ;
\ \ Strings 22feb93py
: ," ( "string"<"> -- ) [char] " parse
here over char+ allot place align ;
: SLiteral ( Compilation c-addr1 u ; run-time -- c-addr2 u ) \ string
\G Compilation: compile the string specified by @var{c-addr1},
\G @var{u} into the current definition. Run-time: return
\G @var{c-addr2 u} describing the address and length of the
\G string.
postpone (S") here over char+ allot place align ;
immediate restrict
\ \ abort" 22feb93py
: abort" ( compilation 'ccc"' -- ; run-time f -- ) \ core,exception-ext abort-quote
\G If any bit of @var{f} is non-zero, perform the function of @code{-2 throw},
\G displaying the string @var{ccc} if there is no exception frame on the
\G exception stack.
postpone (abort") ," ; immediate restrict
\ \ Header states 23feb93py
: cset ( bmask c-addr -- )
tuck c@ or swap c! ;
: creset ( bmask c-addr -- )
tuck c@ swap invert and swap c! ;
: ctoggle ( bmask c-addr -- )
tuck c@ xor swap c! ;
: lastflags ( -- c-addr )
\ the address of the flags byte in the last header
\ aborts if the last defined word was headerless
last @ dup 0= abort" last word was headerless" cell+ ;
: immediate ( -- ) \ core
\G Make the compilation semantics of a word be to @code{execute}
\G the execution semantics.
immediate-mask lastflags cset ;
: restrict ( -- ) \ gforth
\G A synonym for @code{compile-only}
restrict-mask lastflags cset ;
' restrict alias compile-only ( -- ) \ gforth
\G Remove the interpretation semantics of a word.
\ \ Create Variable User Constant 17mar93py
: Alias ( cfa "name" -- ) \ gforth
Header reveal
alias-mask lastflags creset
dup A, lastcfa ! ;
doer? :dovar [IF]
: Create ( "name" -- ) \ core
Header reveal dovar: cfa, ;
[ELSE]
: Create ( "name" -- ) \ core
Header reveal here lastcfa ! 0 A, 0 , DOES> ;
[THEN]
: Variable ( "name" -- ) \ core
Create 0 , ;
: AVariable ( "name" -- ) \ gforth
Create 0 A, ;
: 2Variable ( "name" -- ) \ double
create 0 , 0 , ;
: uallot ( n -- ) udp @ swap udp +! ;
doer? :douser [IF]
: User ( "name" -- ) \ gforth
Header reveal douser: cfa, cell uallot , ;
: AUser ( "name" -- ) \ gforth
User ;
[ELSE]
: User Create cell uallot , DOES> @ up @ + ;
: AUser User ;
[THEN]
doer? :docon [IF]
: (Constant) Header reveal docon: cfa, ;
[ELSE]
: (Constant) Create DOES> @ ;
[THEN]
: Constant ( w "name" -- ) \ core
\G Defines constant @var{name}
\G
\G @var{name} execution: @var{-- w}
(Constant) , ;
: AConstant ( addr "name" -- ) \ gforth
(Constant) A, ;
: Value ( w "name" -- ) \ core-ext
(Constant) , ;
: 2Constant ( w1 w2 "name" -- ) \ double
Create ( w1 w2 "name" -- )
2,
DOES> ( -- w1 w2 )
2@ ;
doer? :dofield [IF]
: (Field) Header reveal dofield: cfa, ;
[ELSE]
: (Field) Create DOES> @ + ;
[THEN]
\ IS Defer What's Defers TO 24feb93py
doer? :dodefer [IF]
: Defer ( "name" -- ) \ gforth
\ !! shouldn't it be initialized with abort or something similar?
Header Reveal dodefer: cfa,
['] noop A, ;
[ELSE]
: Defer ( "name" -- ) \ gforth
Create ['] noop A,
DOES> @ execute ;
[THEN]
: Defers ( "name" -- ) \ gforth
' >body @ compile, ; immediate
\ \ : ; 24feb93py
defer :-hook ( sys1 -- sys2 )
defer ;-hook ( sys2 -- sys1 )
[IFDEF] docol,
: (:noname) ( -- colon-sys )
\ common factor of : and :noname
docol, ]comp defstart ] :-hook ;
[ELSE]
: (:noname) ( -- colon-sys )
\ common factor of : and :noname
docol: cfa, defstart ] :-hook ;
[THEN]
: : ( "name" -- colon-sys ) \ core colon
Header (:noname) ;
: :noname ( -- xt colon-sys ) \ core-ext colon-no-name
0 last !
cfalign here (:noname) ;
[IFDEF] fini,
: ; ( compilation colon-sys -- ; run-time nest-sys ) \ core semicolon
;-hook ?struc fini, comp[ reveal postpone [ ; immediate restrict
[ELSE]
: ; ( compilation colon-sys -- ; run-time nest-sys ) \ core semicolon
;-hook ?struc postpone exit reveal postpone [ ; immediate restrict
[THEN]
\ \ Search list handling: reveal words, recursive 23feb93py
: last? ( -- false / nfa nfa )
last @ ?dup ;
: (reveal) ( nt wid -- )
wordlist-id dup >r
@ over ( name>link ) !
r> ! ;
\ make entry in wordlist-map
' (reveal) f83search reveal-method !
Variable warnings ( -- addr ) \ gforth
G -1 warnings T !
: check-shadow ( addr count wid -- )
\G prints a warning if the string is already present in the wordlist
>r 2dup 2dup r> (search-wordlist) warnings @ and ?dup if
>stderr
." redefined " name>string 2dup type
compare 0<> if
." with " type
else
2drop
then
space space EXIT
then
2drop 2drop ;
: reveal ( -- ) \ gforth
last?
if \ the last word has a header
dup ( name>link ) @ 1 and
if \ it is still hidden
dup ( name>link ) @ 1 xor ( nt wid )
2dup >r name>string r> check-shadow ( nt wid )
dup wordlist-map @ reveal-method perform
else
drop
then
then ;
: rehash ( wid -- )
dup wordlist-map @ rehash-method perform ;
' reveal alias recursive ( compilation -- ; run-time -- ) \ gforth
\g Make the current definition visible, enabling it to call itself
\g recursively.
immediate restrict
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