1 ! Copyright (C) 2004, 2010 Slava Pestov.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: accessors assocs byte-arrays byte-vectors continuations
4 continuations.private init kernel kernel.private math namespaces
8 BUILTIN: alien { underlying c-ptr read-only initial: f } expired ;
9 BUILTIN: dll { path byte-array read-only initial: B{ } } ;
11 PREDICATE: pinned-alien < alien underlying>> not ;
13 UNION: pinned-c-ptr pinned-alien POSTPONE: f ;
15 GENERIC: element-size ( seq -- n ) flushable
17 M: byte-array element-size drop 1 ; inline
19 M: byte-vector element-size drop 1 ; inline
21 M: slice element-size seq>> element-size ; inline
23 M: f element-size drop 1 ; inline
25 GENERIC: byte-length ( obj -- n ) flushable
27 M: object byte-length [ length ] [ element-size ] bi * ; inline
29 GENERIC: >c-ptr ( obj -- c-ptr ) flushable
31 M: c-ptr >c-ptr ; inline
34 [ [ from>> ] [ element-size ] bi * ] [ seq>> >c-ptr ] bi
35 <displaced-alien> ; inline
39 M: object >c-ptr underlying>> ; inline
41 : binary-object ( obj -- c-ptr n )
42 [ >c-ptr ] [ byte-length ] bi ; inline
44 GENERIC: expired? ( c-ptr -- ? ) flushable
46 M: alien expired? expired>> ;
48 M: f expired? drop t ;
50 : <alien> ( address -- alien )
51 f <displaced-alien> { pinned-c-ptr } declare ; inline
53 : <bad-alien> ( -- alien )
54 -1 <alien> t >>expired ; inline
58 2dup [ expired? ] either? [
61 [ alien-address ] same?
67 M: pinned-alien hashcode*
68 nip dup expired>> [ drop 1234 ] [ alien-address ] if ;
70 SINGLETONS: stdcall thiscall fastcall cdecl mingw ;
72 UNION: abi stdcall thiscall fastcall cdecl mingw ;
74 : callee-cleanup? ( abi -- ? )
75 { stdcall fastcall thiscall } member? ;
77 ERROR: alien-callback-error ;
79 : alien-callback ( return parameters abi quot -- alien )
80 alien-callback-error ;
82 ERROR: alien-indirect-error ;
84 : alien-indirect ( args... funcptr return parameters abi -- return... )
85 alien-indirect-error ;
87 ERROR: alien-invoke-error library symbol ;
89 : alien-invoke ( args... return library function parameters -- return... )
90 2over alien-invoke-error ;
92 ERROR: alien-assembly-error code ;
94 : alien-assembly ( args... return parameters abi quot -- return... )
95 dup alien-assembly-error ;
99 ! Callbacks are registered in a global hashtable. Note that they
100 ! are also pinned in a special callback area, so clearing this
101 ! hashtable will not reclaim callbacks. It should only be
102 ! cleared on startup.
105 [ H{ } clone callbacks set-global ] "alien" add-startup-hook
107 ! Used by compiler.codegen to wrap callback bodies
108 : do-callback ( callback-quot wait-quot: ( callback -- ) -- )
109 t CONTEXT-OBJ-IN-CALLBACK-P set-context-object
113 [ 2drop call ] [ swap call( callback -- ) drop ] 3bi ; inline
115 ! A utility for defining global variables that are recompiled in
117 TUPLE: expiry-check object alien ;
119 : recompute-value? ( check -- ? )
120 [ alien>> expired? ] [ t ] if* ;
122 : delete-values ( value assoc -- )
123 [ rot drop = not ] with assoc-filter! drop ;
127 : unregister-and-free-callback ( alien -- )
128 [ callbacks get delete-values ] [ free-callback ] bi ;
130 : with-callback ( alien quot -- )
131 over [ unregister-and-free-callback ] curry [ ] cleanup ; inline
133 : initialize-alien ( symbol quot -- )
134 swap dup get-global dup recompute-value?
135 [ drop [ call dup 31337 <alien> expiry-check boa ] dip set-global ]
136 [ 2nip object>> ] if ; inline