1 ;;;; FIXME: This file and host-c-call.lisp are separate from the
2 ;;;; rest of the alien source code for historical reasons: CMU CL
3 ;;;; made a distinction between the stuff in the C-CALL package and
4 ;;;; stuff in the ALIEN package. There's no obvious boundary
5 ;;;; there, though, and SBCL doesn't try to make this distinction,
6 ;;;; so it might make sense to just merge these files in with the
7 ;;;; rest of the SB-ALIEN code.
9 ;;;; This software is part of the SBCL system. See the README file for
10 ;;;; more information.
12 ;;;; This software is derived from the CMU CL system, which was
13 ;;;; written at Carnegie Mellon University and released into the
14 ;;;; public domain. The software is in the public domain and is
15 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
16 ;;;; files for more information.
18 (in-package "SB!ALIEN")
22 (define-alien-type char
(integer 8))
23 (define-alien-type short
(integer 16))
24 (define-alien-type int
(integer 32))
26 (define-alien-type long
(integer #.sb
!vm
::n-machine-word-bits
))
28 (define-alien-type long
(integer 32))
30 (define-alien-type long-long
(integer 64))
32 (define-alien-type unsigned-char
(unsigned 8))
33 (define-alien-type unsigned-short
(unsigned 16))
34 (define-alien-type unsigned-int
(unsigned 32))
36 (define-alien-type unsigned-long
(unsigned #.sb
!vm
::n-machine-word-bits
))
38 (define-alien-type unsigned-long
(unsigned 32))
39 (define-alien-type unsigned-long-long
(unsigned 64))
41 (define-alien-type float single-float
)
42 (define-alien-type double double-float
)
44 (define-alien-type utf8-string
(c-string :external-format
:utf8
))
46 (define-alien-type-translator void
()
47 (parse-alien-type '(values) (sb!kernel
:make-null-lexenv
)))
50 (defun default-c-string-external-format ()
51 (or *default-c-string-external-format
*
52 (setf *default-c-string-external-format
*
53 (sb!impl
::default-external-format
))))
55 ;;; FIXME: %NATURALIZE-C-STRING (and the UTF8 siblings below) would
56 ;;; appear to be vulnerable to the lisp string moving from underneath
57 ;;; them if the world undergoes a GC, possibly triggered by another
60 ;;; Actually the above shouldn't happen; x86 and x86-64 use GENCGC,
61 ;;; so the string can't move by virtue of pointers to it from
62 ;;; outside the heap. Other platforms will access the lisp string
63 ;;; through the GC-safe interior pointer. -- JES, 2006-01-13
64 (defun %naturalize-c-string
(sap)
65 (declare (type system-area-pointer sap
))
67 (declare (optimize (speed 3) (safety 0)))
68 (let ((length (loop for offset of-type fixnum upfrom
0
69 until
(zerop (sap-ref-8 sap offset
))
70 finally
(return offset
))))
71 (let ((result (make-string length
:element-type
'base-char
)))
72 (sb!kernel
:copy-ub8-from-system-area sap
0 result
0 length
)