1 ! Copyright (C) 2004, 2010 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 PREDICATE: pinned-alien < alien underlying>> not ;
9 UNION: pinned-c-ptr pinned-alien POSTPONE: f ;
11 GENERIC: >c-ptr ( obj -- c-ptr )
13 M: c-ptr >c-ptr ; inline
17 M: object >c-ptr underlying>> ; inline
19 GENERIC: expired? ( c-ptr -- ? ) flushable
21 M: alien expired? expired>> ;
23 M: f expired? drop t ;
25 : <alien> ( address -- alien )
26 f <displaced-alien> { pinned-c-ptr } declare ; inline
28 : <bad-alien> ( -- alien )
29 -1 <alien> t >>expired ; inline
33 2dup [ expired? ] either? [
36 [ alien-address ] bi@ =
42 M: pinned-alien hashcode*
43 nip dup expired>> [ drop 1234 ] [ alien-address ] if ;
45 ERROR: alien-callback-error ;
47 : alien-callback ( return parameters abi quot -- alien )
48 alien-callback-error ;
50 ERROR: alien-indirect-error ;
52 : alien-indirect ( ... funcptr return parameters abi -- ... )
53 alien-indirect-error ;
55 ERROR: alien-invoke-error library symbol ;
57 : alien-invoke ( ... return library function parameters -- ... )
58 2over alien-invoke-error ;
60 ERROR: alien-assembly-error code ;
62 : alien-assembly ( ... return library parameters abi quot -- ... )
63 dup alien-assembly-error ;
65 ! Callbacks are registered in a global hashtable. Note that they
66 ! are also pinned in a special callback area, so clearing this
67 ! hashtable will not reclaim callbacks. It should only be
71 [ H{ } clone callbacks set-global ] "alien" add-startup-hook
75 TUPLE: expiry-check object alien ;
77 : recompute-value? ( check -- ? )
78 dup [ alien>> expired? ] [ drop t ] if ;
82 : initialize-alien ( symbol quot -- )
83 swap dup get-global dup recompute-value?
84 [ drop [ call dup 31337 <alien> expiry-check boa ] dip set-global ]
85 [ 2nip object>> ] if ; inline