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 ) flushable
13 M: c-ptr >c-ptr ; inline
15 GENERIC: byte-length ( seq -- n ) flushable
17 M: byte-array byte-length length ; inline
19 M: f byte-length drop 0 ; inline
21 : binary-object ( obj -- c-ptr n )
22 [ >c-ptr ] [ byte-length ] bi ; inline
26 M: object >c-ptr underlying>> ; inline
28 GENERIC: expired? ( c-ptr -- ? ) flushable
30 M: alien expired? expired>> ;
32 M: f expired? drop t ;
34 : <alien> ( address -- alien )
35 f <displaced-alien> { pinned-c-ptr } declare ; inline
37 : <bad-alien> ( -- alien )
38 -1 <alien> t >>expired ; inline
42 2dup [ expired? ] either? [
45 [ alien-address ] bi@ =
51 M: pinned-alien hashcode*
52 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 ERROR: alien-assembly-error code ;
71 : alien-assembly ( ... return parameters abi quot -- ... )
72 dup alien-assembly-error ;
74 ! Callbacks are registered in a global hashtable. Note that they
75 ! are also pinned in a special callback area, so clearing this
76 ! hashtable will not reclaim callbacks. It should only be
80 [ H{ } clone callbacks set-global ] "alien" add-startup-hook
84 TUPLE: expiry-check object alien ;
86 : recompute-value? ( check -- ? )
87 dup [ alien>> expired? ] [ drop t ] if ;
91 : initialize-alien ( symbol quot -- )
92 swap dup get-global dup recompute-value?
93 [ drop [ call dup 31337 <alien> expiry-check boa ] dip set-global ]
94 [ 2nip object>> ] if ; inline