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 )
23 M: c-ptr >c-ptr ; inline
27 M: object >c-ptr underlying>> ; inline
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@ =
52 M: simple-alien hashcode* nip dup expired>> [ drop 1234 ] [ alien-address ] if ;
54 ERROR: alien-callback-error ;
56 : alien-callback ( return parameters abi quot -- alien )
57 alien-callback-error ;
59 ERROR: alien-indirect-error ;
61 : alien-indirect ( ... funcptr return parameters abi -- )
62 alien-indirect-error ;
64 ERROR: alien-invoke-error library symbol ;
66 : alien-invoke ( ... return library function parameters -- ... )
67 2over alien-invoke-error ;
69 ! Callbacks are registered in a global hashtable. Note that they
70 ! are also pinned in a special callback area, so clearing this
71 ! hashtable will not reclaim callbacks. It should only be
75 [ H{ } clone callbacks set-global ] "alien" add-startup-hook
79 TUPLE: expiry-check object alien ;
81 : recompute-value? ( check -- ? )
82 dup [ alien>> expired? ] [ drop t ] if ;
86 : initialize-alien ( symbol quot -- )
87 swap dup get-global dup recompute-value?
88 [ drop [ call dup 31337 <alien> expiry-check boa ] dip set-global ]
89 [ 2nip object>> ] if ; inline