\ libffi.fs shared library support package 14aug05py
\ Copyright (C) 1995,1996,1997,1998,2000,2003,2005 Free Software Foundation, Inc.
\ This file is part of Gforth.
\ Gforth is free software; you can redistribute it and/or
\ modify it under the terms of the GNU General Public License
\ as published by the Free Software Foundation; either version 2
\ of the License, or (at your option) any later version.
\ This program is distributed in the hope that it will be useful,
\ but WITHOUT ANY WARRANTY; without even the implied warranty of
\ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
\ GNU General Public License for more details.
\ You should have received a copy of the GNU General Public License
\ along with this program; if not, write to the Free Software
\ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
\ common stuff, same as fflib.fs
Variable libs 0 libs !
\ links between libraries
Variable thisproc
Variable thislib
Variable revdec revdec off
\ turn revdec on to compile bigFORTH libraries
Variable revarg revarg off
\ turn revarg on to compile declarations with reverse arguments
Variable legacy legacy off
\ turn legacy on to compile bigFORTH legacy libraries
Vocabulary c-decl
Vocabulary cb-decl
: @lib ( lib -- )
\G obtains library handle
cell+ dup 2 cells + count open-lib
dup 0= abort" Library not found" swap ! ;
: @proc ( lib addr -- )
\G obtains symbol address
cell+ tuck cell+ @ count rot cell+ @
lib-sym dup 0= abort" Proc not found!" swap ! ;
: proc, ( lib -- )
\G allocates and initializes proc stub
\G stub format:
\G linked list in library
\G address of proc
\G ptr to OS name of symbol as counted string
\G threaded code for invocation
here dup thisproc !
swap 2 cells + dup @ A, !
0 , 0 A, ;
Defer legacy-proc ' noop IS legacy-proc
: proc: ( lib "name" -- )
\G Creates a named proc stub
Create proc, 0 also c-decl
legacy @ IF legacy-proc THEN
DOES> ( x1 .. xn -- r )
3 cells + >r ;
: library ( "name" "file" -- )
\G loads library "file" and creates a proc defining word "name"
\G library format:
\G linked list of libraries
\G library handle
\G linked list of library's procs
\G OS name of library as counted string
Create here libs @ A, dup libs !
0 , 0 A, parse-name string, @lib
DOES> ( -- ) dup thislib ! proc: ;
: init-shared-libs ( -- )
defers 'cold libs
0 libs BEGIN @ dup WHILE dup REPEAT drop
BEGIN dup WHILE >r
r@ @lib
r@ 2 cells + BEGIN @ dup WHILE r@ over @proc REPEAT
drop rdrop
REPEAT drop ;
' init-shared-libs IS 'cold
: symbol, ( "c-symbol" -- )
here thisproc @ 2 cells + ! parse-name s,
thislib @ thisproc @ @proc ;
\ stuff for libffi
\ libffi uses a parameter array for the input
$20 Value maxargs
Create retbuf 2 cells allot
Create argbuf maxargs 2* cells allot
Create argptr maxargs 0 [DO] argbuf [I] 2* cells + A, [LOOP]
\ "forward" when revarg is on
\ : >c+ ( char buf -- buf' ) tuck c! cell+ cell+ ;
: >i+ ( n buf -- buf' ) tuck ! cell+ cell+ ;
: >p+ ( addr buf -- buf' ) tuck ! cell+ cell+ ;
: >d+ ( d buf -- buf' ) dup >r ffi-2! r> cell+ cell+ ;
: >sf+ ( r buf -- buf' ) dup sf! cell+ cell+ ;
: >df+ ( r buf -- buf' ) dup df! cell+ cell+ ;
\ "backward" when revarg is off
: >i- ( n buf -- buf' ) 2 cells - tuck ffi-i! ;
: >p- ( addr buf -- buf' ) 2 cells - tuck ! ;
: >d- ( d buf -- buf' ) 2 cells - dup >r ffi-2! r> ;
: >sf- ( r buf -- buf' ) 2 cells - dup sf! ;
: >df- ( r buf -- buf' ) 2 cells - dup df! ;
\ return value
: i>x ( -- n ) retbuf ffi-i@ ;
: p>x ( -- addr ) retbuf @ ;
: d>x ( -- d ) retbuf ffi-2@ ;
: sf>x ( -- r ) retbuf sf@ ;
: df>x ( -- r ) retbuf df@ ;
wordlist constant cifs
Variable cifbuf $40 allot \ maximum: 64 parameters
: cifreset cifbuf cell+ cifbuf ! ;
cifreset
Variable args args off
: argtype ( bkxt fwxt type "name" -- )
Create , , , DOES> 1 args +! ;
: arg@ ( arg -- type pushxt )
dup @ swap cell+
revarg @ IF cell+ THEN @ ;
: arg, ( xt -- )
dup ['] noop = IF drop EXIT THEN compile, ;
: start, ( n -- ) cifbuf cell+ cifbuf !
revarg @ IF drop 0 ELSE 2* cells THEN argbuf +
postpone Literal ;
: ffi-call, ( -- lit-cif )
postpone drop postpone argptr postpone retbuf
thisproc @ cell+ postpone literal postpone @
0 postpone literal here cell -
postpone ffi-call ;
: cif, ( n -- )
cifbuf @ c! 1 cifbuf +! ;
: cif@ ( -- addr u )
cifbuf cell+ cifbuf @ over - ;
: make-cif ( rtype -- addr ) cif,
cif@ cifs search-wordlist
IF execute EXIT THEN
get-current >r cifs set-current
cif@ nextname Create here >r
cif@ 1- bounds ?DO I c@ ffi-type , LOOP
r> cif@ 1- tuck + c@ ffi-type here dup >r 0 ffi-size allot
ffi-prep-cif throw
r> r> set-current ;
: decl, ( 0 arg1 .. argn call rtype start -- )
start, { retxt rtype } cifreset
revdec @ IF 0 >r
BEGIN dup WHILE >r REPEAT
BEGIN r> dup WHILE arg@ arg, REPEAT
ffi-call, retxt compile, postpone EXIT
BEGIN dup WHILE cif, REPEAT drop
ELSE 0 >r
BEGIN dup WHILE arg@ arg, >r REPEAT drop
ffi-call, retxt compile, postpone EXIT
BEGIN r> dup WHILE cif, REPEAT drop
THEN rtype make-cif swap ! here thisproc @ 2 cells + ! ;
: rettype ( endxt n "name" -- )
Create 2,
DOES> 2@ args @ decl, symbol, previous revarg off args off ;
also c-decl definitions
: <rev> revarg on ;
' >i+ ' >i- 6 argtype int
' >p+ ' >p- &12 argtype ptr
' >d+ ' >d- 8 argtype llong
' >sf+ ' >sf- 9 argtype sf
' >df+ ' >df- &10 argtype df
' noop 0 rettype (void)
' i>x 6 rettype (int)
' p>x &12 rettype (ptr)
' d>x 8 rettype (llong)
' sf>x 9 rettype (sf)
' df>x &10 rettype (fp)
previous definitions
\ legacy support for old library interfaces
\ interface to old vararg stuff not implemented yet
also c-decl
:noname ( n 0 -- 0 int1 .. intn )
legacy @ 0< revarg !
swap 0 ?DO int LOOP (int)
; IS legacy-proc
: (int) ( n -- )
>r ' execute r> 0 ?DO int LOOP (int) ;
: (void) ( n -- )
>r ' execute r> 0 ?DO int LOOP (void) ;
: (float) ( n -- )
>r ' execute r> 0 ?DO df LOOP (fp) ;
previous
\ callback stuff
Variable callbacks
\G link between callbacks
Variable rtype
: alloc-callback ( -- addr )
rtype @ cif,
here >r
cif@ 1- bounds ?DO I c@ ffi-type , LOOP
r> cif@ 1- tuck + c@ ffi-type here dup >r 1 ffi-size allot
ffi-prep-closure throw r> ;
: callback ( -- )
Create 0 ] postpone >r also cb-decl cifreset
DOES>
Create here >r 0 , callbacks @ A, r@ callbacks !
swap postpone Literal postpone call , postpone EXIT
r> dup cell+ cell+ alloc-callback swap !
DOES> @ ;
: callback; ( 0 arg1 .. argn -- )
BEGIN over WHILE compile, REPEAT
postpone r> postpone execute compile, drop
postpone EXIT postpone [ previous ; immediate
: rettype' ( xt n -- )
Create , A, immediate
DOES> 2@ rtype ! ;
: argtype' ( xt n -- )
Create , A, immediate
DOES> 2@ cif, ;
: init-callbacks ( -- )
defers 'cold callbacks cell -
BEGIN cell+ @ dup WHILE dup cell+ cell+ alloc-callback over !
REPEAT drop ;
' init-callbacks IS 'cold
also cb-decl definitions
\ arguments
' ffi-arg-int 6 argtype' int
' ffi-arg-float 9 argtype' sf
' ffi-arg-double &10 argtype' df
' ffi-arg-longlong 8 argtype' llong
' ffi-arg-ptr &12 argtype' ptr
' ffi-ret-void 0 rettype' (void)
' ffi-ret-int 6 rettype' (int)
' ffi-ret-float 9 rettype' (sf)
' ffi-ret-double &10 rettype' (fp)
' ffi-ret-longlong 8 rettype' (llong)
' ffi-ret-ptr &12 rettype' (ptr)
previous definitions
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