src/code/target-c-call.lisp

   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.
   8
   9 ;;;; This software is part of the SBCL system. See the README file for
  10 ;;;; more information.
  11 ;;;;
  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.
  17
  18 (in-package "SB!ALIEN")
  19 \f
  20 ;;;; extra types
  21
  22 (define-alien-type char (integer 8))
  23 (define-alien-type short (integer 16))
  24 (define-alien-type int (integer 32))
  25 (define-alien-type long (integer #.sb!vm::n-machine-word-bits))
  26 (define-alien-type long-long (integer 64))
  27
  28 (define-alien-type unsigned-char (unsigned 8))
  29 (define-alien-type unsigned-short (unsigned 16))
  30 (define-alien-type unsigned-int (unsigned 32))
  31 (define-alien-type unsigned-long (unsigned #.sb!vm::n-machine-word-bits))
  32 (define-alien-type unsigned-long-long (unsigned 64))
  33
  34 (define-alien-type float single-float)
  35 (define-alien-type double double-float)
  36
  37 (define-alien-type utf8-string (c-string :external-format :utf8))
  38
  39 (define-alien-type-translator void ()
  40   (parse-alien-type '(values) (sb!kernel:make-null-lexenv)))
  41 \f
  42
  43 (defun default-c-string-external-format ()
  44   #!+sb-xc
  45   :latin-1
  46   #!-sb-xc
  47   (or *default-c-string-external-format*
  48       (setf *default-c-string-external-format*
  49             (sb!impl::default-external-format))))
  50
  51 ;;; FIXME: %NATURALIZE-C-STRING (and the UTF8 siblings below) would
  52 ;;; appear to be vulnerable to the lisp string moving from underneath
  53 ;;; them if the world undergoes a GC, possibly triggered by another
  54 ;;; thread.  Ugh.
  55 ;;;
  56 ;;; Actually the above shouldn't happen; x86 and x86-64 use GENCGC,
  57 ;;; so the string can't move by virtue of pointers to it from
  58 ;;; outside the heap. Other platforms will access the lisp string
  59 ;;; through the GC-safe interior pointer. -- JES, 2006-01-13
  60 (defun %naturalize-c-string (sap)
  61   (declare (type system-area-pointer sap))
  62   (locally
  63       (declare (optimize (speed 3) (safety 0)))
  64     (let ((length (loop for offset of-type fixnum upfrom 0
  65                         until (zerop (sap-ref-8 sap offset))
  66                         finally (return offset))))
  67       (let ((result (make-string length :element-type 'base-char)))
  68         (sb!kernel:copy-ub8-from-system-area sap 0 result 0 length)
  69         result))))
  70
  71 (defun string-to-c-string (string external-format)
  72   (declare (type simple-string string))
  73   (locally
  74       (declare (optimize (speed 3) (safety 0)))
  75     (let ((func (sb!impl::get-external-format-function external-format 10)))
  76       (unless func
  77         (error "Undefined external-format ~A.~%" external-format))
  78       (funcall (symbol-function func) string))))
  79
  80 (defun c-string-to-string (sap external-format element-type)
  81   (declare (type system-area-pointer sap))
  82   (locally
  83       (declare (optimize (speed 3) (safety 0)))
  84     (let ((func (sb!impl::get-external-format-function external-format 9)))
  85       (unless func
  86         (error "Undefined external-format ~A.~%" external-format))
  87       (funcall (symbol-function func) sap element-type))))
  88