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 byte-vectors arrays init ;
7 PREDICATE: pinned-alien < alien underlying>> not ;
9 UNION: pinned-c-ptr pinned-alien POSTPONE: f ;
11 GENERIC: element-size ( seq -- n ) flushable
13 M: byte-array element-size drop 1 ; inline
15 M: byte-vector element-size drop 1 ; inline
17 M: slice element-size seq>> element-size ; inline
19 M: f element-size drop 1 ; inline
21 GENERIC: byte-length ( obj -- n ) flushable
23 M: object byte-length [ length ] [ element-size ] bi * ; inline
25 GENERIC: >c-ptr ( obj -- c-ptr ) flushable
27 M: c-ptr >c-ptr ; inline
30 [ [ from>> ] [ element-size ] bi * ] [ seq>> >c-ptr ] bi
31 <displaced-alien> ; inline
35 M: object >c-ptr underlying>> ; inline
37 : binary-object ( obj -- c-ptr n )
38 [ >c-ptr ] [ byte-length ] bi ; inline
40 GENERIC: expired? ( c-ptr -- ? ) flushable
42 M: alien expired? expired>> ;
44 M: f expired? drop t ;
46 : <alien> ( address -- alien )
47 f <displaced-alien> { pinned-c-ptr } declare ; inline
49 : <bad-alien> ( -- alien )
50 -1 <alien> t >>expired ; inline
54 2dup [ expired? ] either? [
57 [ alien-address ] bi@ =
63 M: pinned-alien hashcode*
64 nip dup expired>> [ drop 1234 ] [ alien-address ] if ;
66 ERROR: alien-callback-error ;
68 : alien-callback ( return parameters abi quot -- alien )
69 alien-callback-error ;
71 ERROR: alien-indirect-error ;
73 : alien-indirect ( ... funcptr return parameters abi -- ... )
74 alien-indirect-error ;
76 ERROR: alien-invoke-error library symbol ;
78 : alien-invoke ( ... return library function parameters -- ... )
79 2over alien-invoke-error ;
81 ERROR: alien-assembly-error code ;
83 : alien-assembly ( ... return parameters abi quot -- ... )
84 dup alien-assembly-error ;
86 ! Callbacks are registered in a global hashtable. Note that they
87 ! are also pinned in a special callback area, so clearing this
88 ! hashtable will not reclaim callbacks. It should only be
92 [ H{ } clone callbacks set-global ] "alien" add-startup-hook
96 TUPLE: expiry-check object alien ;
98 : recompute-value? ( check -- ? )
99 dup [ alien>> expired? ] [ drop t ] if ;
103 : initialize-alien ( symbol quot -- )
104 swap dup get-global dup recompute-value?
105 [ drop [ call dup 31337 <alien> expiry-check boa ] dip set-global ]
106 [ 2nip object>> ] if ; inline