X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fcode%2Fhost-c-call.lisp;h=7b558afcddda9d050fafc4fb2f97122c63a44e42;hb=82cd148d729c241e79c8df04b700beec1b7c55de;hp=8977f80015076bcf137201773393f919c7d3e1ab;hpb=cea4896b2482b7b2b429c1631d774b4cfbc0efba;p=sbcl.git diff --git a/src/code/host-c-call.lisp b/src/code/host-c-call.lisp index 8977f80..7b558af 100644 --- a/src/code/host-c-call.lisp +++ b/src/code/host-c-call.lisp @@ -7,32 +7,134 @@ ;;;; provided with absolutely no warranty. See the COPYING and CREDITS ;;;; files for more information. -(in-package "SB!C-CALL") +(in-package "SB!ALIEN") -(def-alien-type-class (c-string :include pointer :include-args (to))) +(/show0 "host-c-call.lisp 12") -(def-alien-type-translator c-string () - (make-alien-c-string-type :to - (parse-alien-type 'char - (sb!kernel::make-null-lexenv)))) +(define-alien-type-class (c-string :include pointer :include-args (to)) + (external-format :default :type keyword) + (element-type 'character :type (member character base-char)) + (not-null nil :type boolean)) -(def-alien-type-method (c-string :unparse) (type) - (declare (ignore type)) - 'c-string) +(define-alien-type-translator c-string + (&key (external-format :default) + (element-type 'character) + (not-null nil)) + (make-alien-c-string-type + :to (parse-alien-type 'char (sb!kernel:make-null-lexenv)) + :element-type element-type + :external-format external-format + :not-null not-null)) + +(defun c-string-external-format (type) + (let ((external-format (alien-c-string-type-external-format type))) + (if (eq external-format :default) + (default-c-string-external-format) + external-format))) + +(define-alien-type-method (c-string :unparse) (type) + (let* ((external-format (alien-c-string-type-external-format type)) + (element-type (alien-c-string-type-element-type type)) + (not-null (alien-c-string-type-not-null type)) + (tail + (append (unless (eq :default external-format) + (list :external-format external-format)) + (unless (eq 'character element-type) + (list :element-type element-type)) + (when not-null + (list :not-null t))))) + (if tail + (cons 'c-string tail) + 'c-string))) -(def-alien-type-method (c-string :lisp-rep) (type) +(define-alien-type-method (c-string :lisp-rep) (type) + (let ((possibilities '(simple-string (alien (* char)) (simple-array (unsigned-byte 8))))) + (if (alien-c-string-type-not-null type) + `(or ,@possibilities) + `(or null ,@possibilities)))) + +(define-alien-type-method (c-string :deport-pin-p) (type) (declare (ignore type)) - '(or simple-base-string null (alien (* char)))) + t) -(def-alien-type-method (c-string :naturalize-gen) (type alien) +(defun c-string-needs-conversion-p (type) + #+sb-xc-host (declare (ignore type)) + #+sb-xc-host + t + #-sb-xc-host + (let ((external-format (sb!impl::get-external-format + ;; Can't use C-STRING-EXTERNAL-FORMAT here, + ;; since the meaning of :DEFAULT can change + ;; when *DEFAULT-C-STRING-EXTERNAL-FORMAT* + ;; changes. + (alien-c-string-type-external-format type)))) + (not (and external-format + (or (eq (first (sb!impl::ef-names external-format)) :ascii) + ;; On non-SB-UNICODE all latin-1 codepoints will fit + ;; into a base-char, on SB-UNICODE they won't. + #!-sb-unicode + (eq (first (sb!impl::ef-names external-format)) :latin-1)))))) + +(declaim (ftype (sfunction (t) nil) null-error)) +(defun null-error (type) + (aver (alien-c-string-type-not-null type)) + (error 'type-error + :expected-type `(alien ,(unparse-alien-type type)) + :datum nil)) + +(define-alien-type-method (c-string :naturalize-gen) (type alien) `(if (zerop (sap-int ,alien)) - nil - (%naturalize-c-string ,alien))) + ,(if (alien-c-string-type-not-null type) + `(null-error ',type) + nil) + ;; Check whether we need to do a full external-format + ;; conversion, or whether we can just do a cheap byte-by-byte + ;; copy of the c-string data. + ;; + ;; On SB-UNICODE we can never do the cheap copy, even if the + ;; external format and element-type are suitable, since + ;; simple-base-strings may not contain ISO-8859-1 characters. + ;; If we need to check for non-ascii data in the input, we + ;; might as well go through the usual external-format machinery + ;; instead of rewriting another version of it. + ,(if #!+sb-unicode t + #!-sb-unicode (c-string-needs-conversion-p type) + `(sb!alien::c-string-to-string ,alien + (c-string-external-format ,type) + (alien-c-string-type-element-type + ,type)) + `(%naturalize-c-string ,alien)))) -(def-alien-type-method (c-string :deport-gen) (type value) - (declare (ignore type)) +(define-alien-type-method (c-string :deport-gen) (type value) + ;; This SAP taking is safe as DEPORT callers pin the VALUE when + ;; necessary. `(etypecase ,value - (null (int-sap 0)) + (null + ,(if (alien-c-string-type-not-null type) + `(null-error ',type) + `(int-sap 0))) ((alien (* char)) (alien-sap ,value)) - (simple-base-string (vector-sap ,value)))) + (vector (vector-sap ,value)))) + +(define-alien-type-method (c-string :deport-alloc-gen) (type value) + `(etypecase ,value + (null + ,(if (alien-c-string-type-not-null type) + `(null-error ',type) + nil)) + ((alien (* char)) ,value) + (simple-base-string + ,(if (c-string-needs-conversion-p type) + ;; If the alien type is not ascii-compatible (+SB-UNICODE) + ;; or latin-1-compatible (-SB-UNICODE), we need to do + ;; external format conversion. + `(string-to-c-string ,value + (c-string-external-format ,type)) + ;; Otherwise we can just pass it uncopied. + value)) + (simple-string + (string-to-c-string ,value + (c-string-external-format ,type))))) + +(/show0 "host-c-call.lisp end of file")