1 ! Copyright (C) 2004, 2009 Slava Pestov.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: accessors assocs kernel math namespaces sequences system
4 kernel.private byte-arrays arrays init ;
7 ! Some predicate classes used by the compiler for optimization
9 PREDICATE: simple-alien < alien underlying>> not ;
12 simple-alien POSTPONE: f byte-array ;
16 PREDICATE: pinned-alien < alien underlying>> pinned-c-ptr? ;
19 pinned-alien POSTPONE: f ;
21 GENERIC: >c-ptr ( obj -- c-ptr )
27 M: object >c-ptr underlying>> ;
29 GENERIC: expired? ( c-ptr -- ? ) flushable
31 M: alien expired? expired>> ;
33 M: f expired? drop t ;
35 : <alien> ( address -- alien )
36 f <displaced-alien> { simple-c-ptr } declare ; inline
38 : <bad-alien> ( -- alien )
39 -1 <alien> t >>expired ; inline
43 2dup [ expired? ] either? [
46 [ alien-address ] bi@ =
54 libraries [ H{ } clone ] initialize
56 TUPLE: library path abi dll ;
58 : library ( name -- library ) libraries get at ;
60 : <library> ( path abi -- library )
61 over dup [ dlopen ] when \ library boa ;
63 : load-library ( name -- dll )
64 library dup [ dll>> ] when ;
66 : add-library ( name path abi -- )
67 <library> swap libraries get set-at ;
69 ERROR: alien-callback-error ;
71 : alien-callback ( return parameters abi quot -- alien )
72 alien-callback-error ;
74 ERROR: alien-indirect-error ;
76 : alien-indirect ( ... funcptr return parameters abi -- )
77 alien-indirect-error ;
79 ERROR: alien-invoke-error library symbol ;
81 : alien-invoke ( ... return library function parameters -- ... )
82 2over alien-invoke-error ;
84 ! Callbacks are registered in a global hashtable. If you clear
85 ! this hashtable, they will all be blown away by code GC, beware.
88 [ H{ } clone callbacks set-global ] "alien" add-init-hook
92 TUPLE: expiry-check object alien ;
94 : recompute-value? ( check -- ? )
95 dup [ alien>> expired? ] [ drop t ] if ;
99 : initialize-alien ( symbol quot -- )
100 swap dup get-global dup recompute-value?
101 [ drop [ call dup 31337 <alien> expiry-check boa ] dip set-global ]
102 [ 2nip object>> ] if ; inline