mdw@git.distorted.org.uk Git - clg/blob - glib/gforeign.lisp

   1 ;; Common Lisp bindings for GTK+ v2.0
   2 ;; Copyright (C) 1999-2001 Espen S. Johnsen <esj@stud.cs.uit.no>
   3 ;;
   4 ;; This library is free software; you can redistribute it and/or
   5 ;; modify it under the terms of the GNU Lesser General Public
   6 ;; License as published by the Free Software Foundation; either
   7 ;; version 2 of the License, or (at your option) any later version.
   8 ;;
   9 ;; This library is distributed in the hope that it will be useful,
  10 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 ;; Lesser General Public License for more details.
  13 ;;
  14 ;; You should have received a copy of the GNU Lesser General Public
  15 ;; License along with this library; if not, write to the Free Software
  16 ;; Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17
  18 ;; $Id: gforeign.lisp,v 1.12 2001-10-21 21:33:57 espen Exp $
  19
  20 (in-package "GLIB")
  21
  22 ;;;; Type methods
  23
  24 (defvar *type-methods* (make-hash-table))
  25
  26 (defun ensure-type-method-fun (fname)
  27   (unless (fboundp fname)
  28     (setf
  29      (symbol-function fname)
  30      #'(lambda (type-spec &rest args)
  31          (apply
  32           (find-applicable-type-method type-spec fname) type-spec args)))))
  33
  34 (defmacro define-type-method-fun (fname lambda-list)
  35   (declare (ignore lambda-list))
  36   `(defun ,fname (type-spec &rest args)
  37      (apply
  38       (find-applicable-type-method type-spec ',fname) type-spec args)))
  39
  40
  41 (defun ensure-type-name (type)
  42   (etypecase type
  43     (symbol type)
  44     (pcl::class (class-name type))))
  45
  46 (defun add-type-method (type fname function)
  47   (push
  48    (cons fname function)
  49    (gethash (ensure-type-name type) *type-methods*)))
  50
  51 (defun find-type-method (type fname)
  52   (cdr (assoc fname (gethash (ensure-type-name type) *type-methods*))))
  53
  54 (defun find-applicable-type-method (type-spec fname &optional (error t))
  55   (flet ((find-superclass-method (class)
  56            (when (and class (class-finalized-p class))
  57 ;            (unless (class-finalized-p class)
  58 ;              (finalize-inheritance class))
  59              (dolist (super (cdr (pcl::class-precedence-list class)))
  60                (return-if (find-type-method super fname)))))
  61          (find-expanded-type-method (type-spec)
  62            (multiple-value-bind (expanded-type-spec expanded-p)
  63                (type-expand-1 type-spec)
  64              (cond
  65               (expanded-p
  66                (find-applicable-type-method expanded-type-spec fname nil))
  67               ((neq type-spec t)
  68                (find-applicable-type-method t fname nil))))))
  69
  70     (or
  71      (typecase type-spec
  72        (pcl::class
  73         (or
  74          (find-type-method type-spec fname)
  75          (find-superclass-method type-spec)))
  76        (symbol
  77         (or
  78          (find-type-method type-spec fname)
  79          (find-expanded-type-method type-spec)
  80          (find-superclass-method (find-class type-spec nil))))
  81        (cons
  82         (or
  83          (find-type-method (first type-spec) fname)
  84          (find-expanded-type-method type-spec)))
  85        (t
  86         (error "Invalid type specifier ~A" type-spec)))
  87      (and
  88       error
  89       (error
  90        "No applicable method for ~A when called with type specifier ~A"
  91        fname type-spec)))))
  92
  93 (defmacro deftype-method (fname type lambda-list &body body)
  94   `(progn
  95      (ensure-type-method-fun ',fname)
  96      (add-type-method ',type ',fname #'(lambda ,lambda-list ,@body))
  97      ',fname))
  98
  99 ;; To make the compiler happy
 100 (eval-when (:compile-toplevel :load-toplevel :execute)
 101   (define-type-method-fun translate-type-spec (type-spec))
 102   (define-type-method-fun size-of (type-spec))
 103   (define-type-method-fun translate-to-alien (type-spec expr &optional weak-ref))
 104   (define-type-method-fun translate-from-alien (type-spec expr &optional weak-ref))
 105   (define-type-method-fun cleanup-alien (type-spec sap &otional weak-ref))
 106   (define-type-method-fun unreference-alien (type-spec sap)))
 107
 108
 109 ;;;;
 110
 111 (defvar *type-function-cache* (make-hash-table :test #'equal))
 112
 113 (defun get-cached-function (type-spec fname)
 114   (cdr (assoc fname (gethash type-spec *type-function-cache*))))
 115
 116 (defun set-cached-function (type-spec fname function)
 117   (push (cons fname function) (gethash type-spec *type-function-cache*))
 118   function)
 119
 120
 121 (defun intern-argument-translator (type-spec)
 122   (or
 123    (get-cached-function type-spec 'argument-translator)
 124    (set-cached-function type-spec 'argument-translator
 125     (compile
 126      nil
 127      `(lambda (object)
 128         (declare (ignorable object))
 129         ,(translate-to-alien type-spec 'object t))))))
 130
 131 (defun intern-return-value-translator (type-spec)
 132   (or
 133    (get-cached-function type-spec 'return-value-translator)
 134    (set-cached-function type-spec 'return-value-translator
 135     (compile
 136      nil
 137      `(lambda (alien)
 138         (declare (ignorable alien))
 139         ,(translate-from-alien type-spec 'alien nil))))))
 140
 141 (defun intern-cleanup-function (type-spec)
 142   (or
 143    (get-cached-function type-spec 'cleanup-function)
 144    (set-cached-function type-spec 'cleanup-function
 145     (compile
 146      nil
 147      `(lambda (alien)
 148         (declare (ignorable alien))
 149         ,(cleanup-alien type-spec 'alien t))))))
 150
 151
 152
 153 ;; Returns a function to write an object of the specified type
 154 ;; to a memory location
 155 (defun intern-writer-function (type-spec)
 156   (or
 157    (get-cached-function type-spec 'writer-function)
 158    (set-cached-function type-spec 'writer-function
 159     (compile
 160      nil
 161      `(lambda (value sap offset)
 162         (declare (ignorable value sap offset))
 163         (setf
 164          (,(sap-ref-fname type-spec) sap offset)
 165          ,(translate-to-alien type-spec 'value nil)))))))
 166
 167 ;; Returns a function to read an object of the specified type
 168 ;; from a memory location
 169 (defun intern-reader-function (type-spec)
 170   (or
 171    (get-cached-function type-spec 'reader-function)
 172    (set-cached-function type-spec 'reader-function
 173     (compile
 174      nil
 175      `(lambda (sap offset)
 176         (declare (ignorable sap offset))
 177         ,(translate-from-alien
 178           type-spec `(,(sap-ref-fname type-spec) sap offset) t))))))
 179
 180 (defun intern-destroy-function (type-spec)
 181   (if (atomic-type-p type-spec)
 182       #'(lambda (sap offset)
 183           (declare (ignore sap offset)))
 184     (or
 185      (get-cached-function type-spec 'destroy-function)
 186      (set-cached-function type-spec 'destroy-function
 187        (compile
 188         nil
 189         `(lambda (sap offset)
 190            (declare (ignorable sap offset))
 191            ,(unreference-alien
 192              type-spec `(,(sap-ref-fname type-spec) sap offset))))))))
 193
 194
 195
 196 ;;;;
 197
 198 (defconstant +bits-per-unit+ 8
 199   "Number of bits in an addressable unit (byte)")
 200
 201 ;; Sizes of fundamental C types in addressable units
 202 (defconstant +size-of-short+ 2)
 203 (defconstant +size-of-int+ 4)
 204 (defconstant +size-of-long+ 4)
 205 (defconstant +size-of-sap+ 4)
 206 (defconstant +size-of-float+ 4)
 207 (defconstant +size-of-double+ 8)
 208
 209 (defun sap-ref-unsigned (sap offset)
 210   (sap-ref-32 sap offset))
 211
 212 (defun sap-ref-signed (sap offset)
 213   (signed-sap-ref-32 sap offset))
 214
 215 (defun sap-ref-fname (type-spec)
 216   (let ((alien-type-spec (mklist (translate-type-spec type-spec))))
 217     (ecase (first alien-type-spec)
 218       (unsigned
 219        (ecase (second alien-type-spec)
 220          (8 'sap-ref-8)
 221          (16 'sap-ref-16)
 222          (32 'sap-ref-32)
 223          (64 'sap-ref-64)))
 224       (signed
 225        (ecase (second alien-type-spec)
 226          (8 'signed-sap-ref-8)
 227          (16 'signed-sap-ref-16)
 228          (32 'signed-sap-ref-32)
 229          (64 'signed-sap-ref-64)))
 230       (system-area-pointer 'sap-ref-sap)
 231       (single-float 'sap-ref-single)
 232       (double-float 'sap-ref-double))))
 233
 234
 235 ;;;; Foreign function call interface
 236
 237 (defvar *package-prefix* nil)
 238
 239 (defun set-package-prefix (prefix &optional (package *package*))
 240   (let ((package (find-package package)))
 241     (delete-if #'(lambda (assoc) (eq (car assoc) package)) *package-prefix*)
 242     (push (cons package prefix) *package-prefix*))
 243   prefix)
 244
 245 (defun package-prefix (&optional (package *package*))
 246   (let ((package (find-package package)))
 247     (or
 248      (cdr (assoc package *package-prefix*))
 249      (substitute #\_ #\- (string-downcase (package-name package))))))
 250
 251 (defun find-prefix-package (prefix)
 252   (or
 253    (car (rassoc (string-downcase prefix) *package-prefix* :test #'string=))
 254    (find-package (string-upcase prefix))))
 255
 256 (defmacro use-prefix (prefix &optional (package *package*))
 257   `(eval-when (:compile-toplevel :load-toplevel :execute)
 258      (set-package-prefix ,prefix ,package)))
 259
 260
 261 (defun default-alien-fname (lisp-name)
 262   (let* ((lisp-name-string
 263           (if (char= (char (the simple-string (string lisp-name)) 0) #\%)
 264               (subseq (the simple-string (string lisp-name)) 1)
 265             (string lisp-name)))
 266          (prefix (package-prefix *package*))
 267          (name (substitute #\_ #\- (string-downcase lisp-name-string))))
 268     (if (or (not prefix) (string= prefix ""))
 269         name
 270       (format nil "~A_~A" prefix name))))
 271
 272 (defun default-alien-type-name (type-name)
 273   (let ((prefix (package-prefix *package*)))
 274     (apply
 275      #'concatenate
 276      'string
 277      (mapcar
 278       #'string-capitalize
 279       (cons prefix (split-string (symbol-name type-name) #\-))))))
 280
 281 (defun default-type-name (alien-name)
 282   (let ((parts
 283          (mapcar
 284           #'string-upcase
 285           (split-string-if alien-name #'upper-case-p))))
 286     (intern
 287      (concatenate-strings
 288       (rest parts) #\-) (find-prefix-package (first parts)))))
 289
 290
 291 (defmacro defbinding (name lambda-list return-type-spec &rest docs/args)
 292   (multiple-value-bind (lisp-name c-name)
 293       (if (atom name)
 294           (values name (default-alien-fname name))
 295         (values-list name))
 296
 297     (let ((supplied-lambda-list lambda-list)
 298           (docs nil)
 299           (args nil))
 300       (dolist (doc/arg docs/args)
 301         (if (stringp doc/arg)
 302             (push doc/arg docs)
 303           (progn
 304             (destructuring-bind (expr type &optional (style :in)) doc/arg
 305               (unless (member style '(:in :out :in-out))
 306                 (error "Bogus argument style ~S in ~S." style doc/arg))
 307               (when (and
 308                      (not supplied-lambda-list)
 309                      (namep expr) (member style '(:in :in-out)))
 310                 (push expr lambda-list))
 311               (push
 312                (list (if (namep expr) expr (gensym)) expr type style) args)))))
 313
 314       (%defbinding
 315        c-name lisp-name (or supplied-lambda-list (nreverse lambda-list))
 316        return-type-spec (reverse docs) (reverse args)))))
 317
 318 #+cmu
 319 (defun %defbinding (foreign-name lisp-name lambda-list
 320                     return-type-spec docs args)
 321   (ext:collect ((alien-types) (alien-bindings) (alien-parameters)
 322                 (alien-values) (alien-deallocators))
 323     (dolist (arg args)
 324       (destructuring-bind (var expr type-spec style) arg
 325         (let ((declaration (translate-type-spec type-spec))
 326               (deallocation (cleanup-alien type-spec var t)))
 327           (cond
 328            ((member style '(:out :in-out))
 329             (alien-types `(* ,declaration))
 330             (alien-parameters `(addr ,var))
 331             (alien-bindings
 332              `(,var ,declaration
 333                ,@(when (eq style :in-out)
 334                    (list (translate-to-alien type-spec expr t)))))
 335             (alien-values (translate-from-alien type-spec var nil)))
 336           (deallocation
 337            (alien-types declaration)
 338            (alien-bindings
 339             `(,var ,declaration ,(translate-to-alien type-spec expr t)))
 340            (alien-parameters var)
 341            (alien-deallocators deallocation))
 342           (t
 343            (alien-types declaration)
 344            (alien-parameters (translate-to-alien type-spec expr t)))))))
 345
 346     (let ((alien-funcall `(alien-funcall ,lisp-name ,@(alien-parameters))))
 347       `(defun ,lisp-name ,lambda-list
 348          ,@docs
 349          (with-alien ((,lisp-name
 350                        (function
 351                         ,(translate-type-spec return-type-spec)
 352                         ,@(alien-types))
 353                        :extern ,foreign-name)
 354                       ,@(alien-bindings))
 355            ,(if return-type-spec
 356                 `(let ((result
 357                         ,(translate-from-alien return-type-spec alien-funcall nil)))
 358                    ,@(alien-deallocators)
 359                    (values result ,@(alien-values)))
 360               `(progn
 361                  ,alien-funcall
 362                  ,@(alien-deallocators)
 363                  (values ,@(alien-values)))))))))
 364
 365
 366 (defun mkbinding (name return-type &rest arg-types)
 367    (declare (optimize (ext:inhibit-warnings 3)))
 368    (let* ((ftype
 369            `(function
 370              ,@(mapcar #'translate-type-spec (cons return-type arg-types))))
 371          (alien
 372           (alien::%heap-alien
 373            (alien::make-heap-alien-info
 374             :type (alien::parse-alien-type ftype)
 375             :sap-form (system:foreign-symbol-address name))))
 376          (translate-arguments
 377           (mapcar #'intern-return-value-translator arg-types))
 378          (translate-return-value (intern-return-value-translator return-type))
 379          (cleanup-arguments (mapcar #'intern-cleanup-function arg-types)))
 380
 381     #'(lambda (&rest args)
 382         (map-into args #'funcall translate-arguments args)
 383         (prog1
 384             (funcall
 385              translate-return-value (apply #'alien:alien-funcall alien args))
 386           (mapc #'funcall cleanup-arguments args)))))
 387
 388
 389 (defun type-translateable-p (type-spec)
 390   (find-applicable-type-method type-spec 'translate-type-spec nil))
 391
 392 (defun every-type-translateable-p (type-specs)
 393   (every #'type-translateable-p type-specs))
 394
 395 (defun mkbinding-late (name return-type &rest arg-types)
 396   (if (every-type-translateable-p (cons return-type arg-types))
 397       (apply #'mkbinding name return-type arg-types)
 398     (let ((binding nil))
 399       #'(lambda (&rest args)
 400           (cond
 401            (binding (apply binding args))
 402            ((every-type-translateable-p (cons return-type arg-types))
 403             (setq binding (apply #'mkbinding name return-type arg-types))
 404             (apply binding args))
 405            (t
 406             (dolist (type-spec (cons return-type arg-types))
 407               (unless (type-translateable-p type-spec)
 408                 (error "Can't translate type ~A" type-spec)))))))))
 409
 410
 411
 412 ;;;; Definitons and translations of fundamental types
 413
 414 (deftype long (&optional (min '*) (max '*)) `(integer ,min ,max))
 415 (deftype unsigned-long (&optional (min '*) (max '*)) `(integer ,min ,max))
 416 (deftype int (&optional (min '*) (max '*)) `(long ,min ,max))
 417 (deftype unsigned-int (&optional (min '*) (max '*)) `(unsigned-long ,min ,max))
 418 (deftype short (&optional (min '*) (max '*)) `(int ,min ,max))
 419 (deftype unsigned-short (&optional (min '*) (max '*)) `(unsigned-int ,min ,max))
 420 (deftype signed (&optional (size '*)) `(signed-byte ,size))
 421 (deftype unsigned (&optional (size '*)) `(signed-byte ,size))
 422 (deftype char () 'base-char)
 423 (deftype pointer () 'system-area-pointer)
 424 (deftype boolean (&optional (size '*))
 425   (declare (ignore size))
 426   `(member t nil))
 427 (deftype invalid () nil)
 428
 429 (defun atomic-type-p (type-spec)
 430   (or
 431    (eq type-spec 'pointer)
 432    (not (eq (translate-type-spec type-spec) 'system-area-pointer))))
 433
 434
 435 (deftype-method cleanup-alien t (type-spec sap &optional weak-ref)
 436   (declare (ignore type-spec sap weak-ref))
 437   nil)
 438
 439
 440 (deftype-method translate-to-alien integer (type-spec number &optional weak-ref)
 441   (declare (ignore type-spec weak-ref))
 442   number)
 443
 444 (deftype-method translate-from-alien integer (type-spec number &optional weak-ref)
 445   (declare (ignore type-spec weak-ref))
 446   number)
 447
 448
 449 (deftype-method translate-type-spec fixnum (type-spec)
 450   (declare (ignore type-spec))
 451   (translate-type-spec 'signed))
 452
 453 (deftype-method size-of fixnum (type-spec)
 454   (declare (ignore type-spec))
 455   (size-of 'signed))
 456
 457 (deftype-method translate-to-alien fixnum (type-spec number &optional weak-ref)
 458   (declare (ignore type-spec weak-ref))
 459   number)
 460
 461 (deftype-method translate-from-alien fixnum (type-spec number &optional weak-ref)
 462   (declare (ignore type-spec weak-ref))
 463   number)
 464
 465
 466 (deftype-method translate-type-spec long (type-spec)
 467   (declare (ignore type-spec))
 468   `(signed ,(* +bits-per-unit+ +size-of-long+)))
 469
 470 (deftype-method size-of long (type-spec)
 471   (declare (ignore type-spec))
 472   +size-of-long+)
 473
 474
 475 (deftype-method translate-type-spec unsigned-long (type-spec)
 476   (declare (ignore type-spec))
 477   `(unsigned ,(* +bits-per-unit+ +size-of-long+)))
 478
 479 (deftype-method size-of unsigned-long (type-spec)
 480   (declare (ignore type-spec))
 481   +size-of-long+)
 482
 483
 484 (deftype-method translate-type-spec int (type-spec)
 485   (declare (ignore type-spec))
 486   `(signed ,(* +bits-per-unit+ +size-of-int+)))
 487
 488 (deftype-method size-of int (type-spec)
 489   (declare (ignore type-spec))
 490   +size-of-int+)
 491
 492
 493 (deftype-method translate-type-spec unsigned-int (type-spec)
 494   (declare (ignore type-spec))
 495   `(unsigned ,(* +bits-per-unit+ +size-of-int+)))
 496
 497 (deftype-method size-of unsigned-int (type-spec)
 498   (declare (ignore type-spec))
 499   +size-of-int+)
 500
 501
 502 (deftype-method translate-type-spec short (type-spec)
 503   (declare (ignore type-spec))
 504   `(signed ,(* +bits-per-unit+ +size-of-short+)))
 505
 506 (deftype-method size-of short (type-spec)
 507   (declare (ignore type-spec))
 508   +size-of-short+)
 509
 510
 511 (deftype-method translate-type-spec unsigned-short (type-spec)
 512   (declare (ignore type-spec))
 513   `(unsigned ,(* +bits-per-unit+ +size-of-short+)))
 514
 515 (deftype-method size-of unsigned-short (type-spec)
 516   (declare (ignore type-spec))
 517   +size-of-short+)
 518
 519
 520 (deftype-method translate-type-spec signed-byte (type-spec)
 521   (let ((size (second (mklist (type-expand-to 'signed-byte type-spec)))))
 522     `(signed
 523       ,(cond
 524         ((member size '(nil *)) (* +bits-per-unit+ +size-of-int+))
 525         (t size)))))
 526
 527 (deftype-method size-of signed-byte (type-spec)
 528   (let ((size (second (mklist (type-expand-to 'signed-byte type-spec)))))
 529     (cond
 530      ((member size '(nil *)) +size-of-int+)
 531      (t (/ size +bits-per-unit+)))))
 532
 533 (deftype-method translate-to-alien signed-byte (type-spec number &optional weak-ref)
 534   (declare (ignore type-spec weak-ref))
 535   number)
 536
 537 (deftype-method translate-from-alien signed-byte
 538     (type-spec number &optional weak-ref)
 539   (declare (ignore type-spec weak-ref))
 540   number)
 541
 542
 543 (deftype-method translate-type-spec unsigned-byte (type-spec)
 544   (let ((size (second (mklist (type-expand-to 'unsigned-byte type-spec)))))
 545     `(signed
 546       ,(cond
 547         ((member size '(nil *)) (* +bits-per-unit+ +size-of-int+))
 548         (t size)))))
 549
 550 (deftype-method size-of unsigned-byte (type-spec)
 551   (let ((size (second (mklist (type-expand-to 'unsigned-byte type-spec)))))
 552     (cond
 553      ((member size '(nil *)) +size-of-int+)
 554      (t (/ size +bits-per-unit+)))))
 555
 556 (deftype-method translate-to-alien unsigned-byte (type-spec number &optional weak-ref)
 557   (declare (ignore type-spec weak-ref))
 558   number)
 559
 560 (deftype-method translate-from-alien unsigned-byte
 561     (type-spec number &optional weak-ref)
 562   (declare (ignore type-spec weak-ref))
 563   number)
 564
 565
 566 (deftype-method translate-type-spec single-float (type-spec)
 567   (declare (ignore type-spec))
 568   'single-float)
 569
 570 (deftype-method size-of single-float (type-spec)
 571   (declare (ignore type-spec))
 572   +size-of-float+)
 573
 574 (deftype-method translate-to-alien single-float (type-spec number &optional weak-ref)
 575   (declare (ignore type-spec weak-ref))
 576   number)
 577
 578 (deftype-method translate-from-alien single-float
 579     (type-spec number &optional weak-ref)
 580   (declare (ignore type-spec weak-ref))
 581   number)
 582
 583
 584 (deftype-method translate-type-spec double-float (type-spec)
 585   (declare (ignore type-spec))
 586   'double-float)
 587
 588 (deftype-method size-of double-float (type-spec)
 589   (declare (ignore type-spec))
 590   +size-of-double+)
 591
 592 (deftype-method translate-to-alien double-float (type-spec number &optional weak-ref)
 593   (declare (ignore type-spec weak-ref))
 594   number)
 595
 596 (deftype-method translate-from-alien double-float
 597     (type-spec number &optional weak-ref)
 598   (declare (ignore type-spec weak-ref))
 599   number)
 600
 601
 602 (deftype-method translate-type-spec base-char (type-spec)
 603   (declare (ignore type-spec))
 604   `(unsigned ,+bits-per-unit+))
 605
 606 (deftype-method size-of base-char (type-spec)
 607   (declare (ignore type-spec))
 608   1)
 609
 610 (deftype-method translate-to-alien base-char (type-spec char &optional weak-ref)
 611   (declare (ignore type-spec weak-ref))
 612   `(char-code ,char))
 613
 614 (deftype-method translate-from-alien base-char (type-spec code &optional weak-ref)
 615   (declare (ignore type-spec weak-ref))
 616   `(code-char ,code))
 617
 618
 619 (deftype-method translate-type-spec string (type-spec)
 620   (declare (ignore type-spec))
 621   'system-area-pointer)
 622
 623 (deftype-method size-of string (type-spec)
 624   (declare (ignore type-spec))
 625   +size-of-sap+)
 626
 627 (deftype-method translate-to-alien string (type-spec string &optional weak-ref)
 628   (declare (ignore type-spec weak-ref))
 629   `(let ((string ,string))
 630      ;; Always copy strings to prevent seg fault due to GC
 631      (copy-memory
 632       (make-pointer (1+ (kernel:get-lisp-obj-address string)))
 633       (1+ (length string)))))
 634
 635 (deftype-method translate-from-alien string
 636     (type-spec c-string &optional weak-ref)
 637   (declare (ignore type-spec))
 638   `(let ((c-string ,c-string))
 639      (unless (null-pointer-p c-string)
 640        (prog1
 641            (c-call::%naturalize-c-string c-string)
 642          ;,(unless weak-ref `(deallocate-memory c-string))
 643          ))))
 644
 645 (deftype-method cleanup-alien string (type-spec c-string &optional weak-ref)
 646   (when weak-ref
 647     (unreference-alien type-spec c-string)))
 648
 649 (deftype-method unreference-alien string (type-spec c-string)
 650   (declare (ignore type-spec))
 651   `(let ((c-string ,c-string))
 652      (unless (null-pointer-p c-string)
 653        (deallocate-memory c-string))))
 654
 655
 656 (deftype-method translate-type-spec boolean (type-spec)
 657   (translate-type-spec
 658    (cons 'unsigned (cdr (mklist (type-expand-to 'boolean type-spec))))))
 659
 660 (deftype-method size-of boolean (type-spec)
 661   (size-of
 662    (cons 'unsigned (cdr (mklist (type-expand-to 'boolean type-spec))))))
 663
 664 (deftype-method translate-to-alien boolean (type-spec boolean &optional weak-ref)
 665   (declare (ignore type-spec weak-ref))
 666   `(if ,boolean 1 0))
 667
 668 (deftype-method translate-from-alien boolean (type-spec int &optional weak-ref)
 669   (declare (ignore type-spec weak-ref))
 670   `(not (zerop ,int)))
 671
 672
 673 (deftype-method translate-type-spec or (union-type)
 674   (let* ((member-types (cdr (type-expand-to 'or union-type)))
 675          (alien-type (translate-type-spec (first member-types))))
 676     (dolist (type (cdr member-types))
 677       (unless (eq alien-type (translate-type-spec type))
 678         (error "No common alien type specifier for union type: ~A" union-type)))
 679     alien-type))
 680
 681 (deftype-method size-of or (union-type)
 682   (size-of (first (cdr (type-expand-to 'or union-type)))))
 683
 684 (deftype-method translate-to-alien or (union-type-spec expr &optional weak-ref)
 685   (destructuring-bind (name &rest type-specs)
 686       (type-expand-to 'or union-type-spec)
 687     (declare (ignore name))
 688     `(let ((value ,expr))
 689        (etypecase value
 690          ,@(map
 691             'list
 692               #'(lambda (type-spec)
 693                   (list type-spec (translate-to-alien type-spec 'value weak-ref)))
 694               type-specs)))))
 695
 696
 697 (deftype-method translate-type-spec system-area-pointer (type-spec)
 698   (declare (ignore type-spec))
 699   'system-area-pointer)
 700
 701 (deftype-method size-of system-area-pointer (type-spec)
 702   (declare (ignore type-spec))
 703   +size-of-sap+)
 704
 705 (deftype-method translate-to-alien system-area-pointer (type-spec sap &optional weak-ref)
 706   (declare (ignore type-spec weak-ref))
 707   sap)
 708
 709 (deftype-method translate-from-alien system-area-pointer
 710     (type-spec sap &optional weak-ref)
 711   (declare (ignore type-spec weak-ref))
 712   sap)
 713
 714
 715 (deftype-method translate-type-spec null (type-spec)
 716   (declare (ignore type-spec))
 717   'system-area-pointer)
 718
 719 (deftype-method translate-to-alien null (type-spec expr &optional weak-ref)
 720   (declare (ignore type-spec expr weak-ref))
 721   `(make-pointer 0))
 722
 723
 724 (deftype-method translate-type-spec nil (type-spec)
 725   (declare (ignore type-spec))
 726   'void)
 727
 728 (deftype-method translate-from-alien nil (type-spec expr &optional weak-ref)
 729   (declare (ignore type-spec weak-ref))
 730   `(progn
 731      ,expr
 732      (values)))