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

   1 ;; Common Lisp bindings for GTK+ v2.0
   2 ;; Copyright (C) 1999-2000 Espen S. Johnsen <espejohn@online.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 1.5 2000-10-01 17:19:11 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 class
  57              (dolist (super (cdr (pcl::class-precedence-list class)))
  58                (return-if (find-type-method super fname)))))
  59          (find-expanded-type-method (type-spec)
  60            (multiple-value-bind (expanded-type-spec expanded-p)
  61                (type-expand-1 type-spec)
  62              (cond
  63               (expanded-p
  64                (find-applicable-type-method expanded-type-spec fname nil))
  65               ((neq type-spec t)
  66                (find-applicable-type-method t fname nil))))))
  67
  68     (or
  69      (typecase type-spec
  70        (pcl::class
  71         (or
  72          (find-type-method type-spec fname)
  73          (find-superclass-method type-spec)))
  74        (symbol
  75         (or
  76          (find-type-method type-spec fname)
  77          (find-expanded-type-method type-spec)
  78          (find-superclass-method (find-class type-spec nil))))
  79        (cons
  80         (or
  81          (find-type-method (first type-spec) fname)
  82          (find-expanded-type-method type-spec)))
  83        (t
  84         (error "Invalid type specifier ~A" type-spec)))
  85      (and
  86       error
  87       (error
  88        "No applicable method for ~A when called with type specifier ~A"
  89        fname type-spec)))))
  90
  91 (defmacro deftype-method (fname type lambda-list &body body)
  92   `(progn
  93      (ensure-type-method-fun ',fname)
  94      (add-type-method ',type ',fname #'(lambda ,lambda-list ,@body))
  95      ',fname))
  96
  97 (defmacro deftype (name parameters &body body)
  98   (destructuring-bind (lisp-name &optional alien-name) (mklist name)
  99     `(progn
 100        ,(when alien-name
 101           `(setf (alien-type-name ',lisp-name) ,alien-name))
 102        (lisp:deftype ,lisp-name ,parameters ,@body))))
 103
 104 ;; To make the compiler shut up
 105 (eval-when (:compile-toplevel :load-toplevel :execute)
 106   (define-type-method-fun translate-type-spec (type-spec))
 107   (define-type-method-fun size-of (type-spec))
 108   (define-type-method-fun translate-to-alien (type-spec expr &optional copy))
 109   (define-type-method-fun translate-from-alien (type-spec expr &optional alloc))
 110   (define-type-method-fun cleanup-alien (type-spec alien &optional copied)))
 111
 112
 113 ;;;;
 114
 115 (defvar *type-function-cache* (make-hash-table :test #'equal))
 116
 117 (defun get-cached-function (type-spec fname)
 118   (cdr (assoc fname (gethash type-spec *type-function-cache*))))
 119
 120 (defun set-cached-function (type-spec fname function)
 121   (push (cons fname function) (gethash type-spec *type-function-cache*))
 122   function)
 123
 124
 125 ;; Creates a function to translate an object of the specified type
 126 ;; from lisp to alien representation.
 127 (defun get-to-alien-function (type-spec)
 128   (or
 129    (get-cached-function type-spec 'to-alien-function)
 130    (set-cached-function type-spec 'to-alien-function
 131     (compile
 132      nil
 133      `(lambda (object)
 134         (declare (ignorable object))
 135         ,(translate-to-alien type-spec 'object))))))
 136
 137 ;; and the opposite
 138 (defun get-from-alien-function (type-spec)
 139   (or
 140    (get-cached-function type-spec 'from-alien-function)
 141    (set-cached-function type-spec 'from-alien-function
 142     (compile
 143      nil
 144      `(lambda (alien)
 145         (declare (ignorable alien))
 146         ,(translate-from-alien type-spec 'alien))))))
 147
 148 ;; and for cleaning up
 149 (defun get-cleanup-function (type-spec)
 150   (or
 151    (get-cached-function type-spec 'cleanup-function)
 152    (set-cached-function type-spec 'cleanup-function
 153     (compile
 154      nil
 155      `(lambda (alien)
 156         (declare (ignorable alien))
 157         ,(cleanup-alien type-spec 'alien))))))
 158
 159
 160
 161 ;; Creates a function to write an object of the specified type
 162 ;; to the given memory location
 163 (defun get-writer-function (type-spec)
 164   (or
 165    (get-cached-function type-spec 'writer-function)
 166    (set-cached-function type-spec 'writer-function
 167     (compile
 168      nil
 169      `(lambda (value sap offset)
 170         (declare (ignorable value sap offset))
 171         (setf
 172          (,(sap-ref-fname type-spec) sap offset)
 173          ,(translate-to-alien type-spec 'value :copy)))))))
 174
 175 ;; Creates a function to read an object of the specified type
 176 ;; from the given memory location
 177 (defun get-reader-function (type-spec)
 178   (or
 179    (get-cached-function type-spec 'reader-function)
 180    (set-cached-function type-spec 'reader-function
 181     (compile
 182      nil
 183      `(lambda (sap offset)
 184         (declare (ignorable sap offset))
 185         ,(translate-from-alien
 186           type-spec `(,(sap-ref-fname type-spec) sap offset) :reference))))))
 187
 188
 189 (defun get-destroy-function (type-spec)
 190   (or
 191    (get-cached-function type-spec 'destroy-function)
 192    (set-cached-function type-spec 'destroy-function
 193     (compile
 194      nil
 195      `(lambda (sap offset)
 196         (declare (ignorable sap offset))
 197         ,(cleanup-alien
 198           type-spec `(,(sap-ref-fname type-spec) sap offset) :copied))))))
 199
 200
 201
 202 ;;;;
 203
 204 (defconstant +bits-per-unit+ 8
 205   "Number of bits in an addressable unit (byte)")
 206
 207 ;; Sizes of fundamental C types in addressable units
 208 (defconstant +size-of-short+ 2)
 209 (defconstant +size-of-int+ 4)
 210 (defconstant +size-of-long+ 4)
 211 (defconstant +size-of-sap+ 4)
 212 (defconstant +size-of-float+ 4)
 213 (defconstant +size-of-double+ 8)
 214
 215 (defun sap-ref-unsigned (sap offset)
 216   (sap-ref-32 sap offset))
 217
 218 (defun sap-ref-signed (sap offset)
 219   (signed-sap-ref-32 sap offset))
 220
 221 (defun sap-ref-fname (type-spec)
 222   (let ((alien-type-spec (mklist (translate-type-spec type-spec))))
 223     (ecase (first alien-type-spec)
 224       (unsigned
 225        (ecase (second alien-type-spec)
 226          (8 'sap-ref-8)
 227          (16 'sap-ref-16)
 228          (32 'sap-ref-32)
 229          (64 'sap-ref-64)))
 230       (signed
 231        (ecase (second alien-type-spec)
 232          (8 'signed-sap-ref-8)
 233          (16 'signed-sap-ref-16)
 234          (32 'signed-sap-ref-32)
 235          (64 'signed-sap-ref-64)))
 236       (system-area-pointer 'sap-ref-sap)
 237       (single-float 'sap-ref-single)
 238       (double-float 'sap-ref-double))))
 239
 240
 241 ;;;; Foreign function call interface
 242
 243 (defvar *package-prefix* nil)
 244
 245 (defun set-package-prefix (prefix &optional (package *package*))
 246   (let ((package (find-package package)))
 247     (delete-if #'(lambda (assoc) (eq (car assoc) package)) *package-prefix*)
 248     (push (cons package prefix) *package-prefix*))
 249   prefix)
 250
 251 (defun package-prefix (&optional (package *package*))
 252   (let ((package (find-package package)))
 253     (or
 254      (cdr (assoc package *package-prefix*))
 255      (substitute #\_ #\- (string-downcase (package-name package))))))
 256
 257 (defmacro use-prefix (prefix &optional (package *package*))
 258   `(eval-when (:compile-toplevel :load-toplevel :execute)
 259      (set-package-prefix ,prefix ,package)))
 260
 261
 262 (defun default-alien-func-name (lisp-name)
 263   (let* ((lisp-name-string
 264           (if (char= (char (the simple-string (string lisp-name)) 0) #\%)
 265               (subseq (the simple-string (string lisp-name)) 1)
 266             (string lisp-name)))
 267          (prefix (package-prefix *package*))
 268          (name (substitute #\_ #\- (string-downcase lisp-name-string))))
 269     (if (or (not prefix) (string= prefix ""))
 270         name
 271       (format nil "~A_~A" prefix name))))
 272
 273
 274 (defmacro define-foreign (name lambda-list return-type-spec &rest docs/args)
 275   (multiple-value-bind (c-name lisp-name)
 276       (if (atom name)
 277           (values (default-alien-func-name name) name)
 278         (values-list name))
 279     (let ((supplied-lambda-list lambda-list)
 280           (docs nil)
 281           (args nil))
 282       (dolist (doc/arg docs/args)
 283         (if (stringp doc/arg)
 284             (push doc/arg docs)
 285           (progn
 286             (destructuring-bind (expr type &optional (style :in)) doc/arg
 287               (unless (member style '(:in :out :in-out))
 288                 (error "Bogus argument style ~S in ~S." style doc/arg))
 289               (when (and
 290                      (not supplied-lambda-list)
 291                      (namep expr) (member style '(:in :in-out)))
 292                 (push expr lambda-list))
 293               (push
 294                (list (if (namep expr) expr (gensym)) expr type style) args)))))
 295
 296       (%define-foreign
 297        c-name lisp-name (or supplied-lambda-list (nreverse lambda-list))
 298        return-type-spec (reverse docs) (reverse args)))))
 299
 300
 301 #+cmu
 302 (defun %define-foreign (foreign-name lisp-name lambda-list
 303                         return-type-spec docs args)
 304   (ext:collect ((alien-types) (alien-bindings) (alien-parameters)
 305                 (alien-values) (alien-deallocators))
 306     (dolist (arg args)
 307       (destructuring-bind (var expr type-spec style) arg
 308         (let ((declaration (translate-type-spec type-spec))
 309               (deallocation (cleanup-alien type-spec expr)))
 310           (cond
 311            ((member style '(:out :in-out))
 312             (alien-types `(* ,declaration))
 313             (alien-parameters `(addr ,var))
 314             (alien-bindings
 315              `(,var ,declaration
 316                ,@(when (eq style :in-out)
 317                    (list (translate-to-alien type-spec expr)))))
 318             (alien-values (translate-from-alien type-spec var)))
 319           (deallocation
 320            (alien-types declaration)
 321            (alien-bindings
 322             `(,var ,declaration ,(translate-to-alien type-spec expr)))
 323            (alien-parameters var)
 324            (alien-deallocators deallocation))
 325           (t
 326            (alien-types declaration)
 327            (alien-parameters (translate-to-alien type-spec expr)))))))
 328
 329     (let ((alien-funcall `(alien-funcall ,lisp-name ,@(alien-parameters))))
 330       `(defun ,lisp-name ,lambda-list
 331          ,@docs
 332          (with-alien ((,lisp-name
 333                        (function
 334                         ,(translate-type-spec return-type-spec)
 335                         ,@(alien-types))
 336                        :extern ,foreign-name)
 337                       ,@(alien-bindings))
 338            ,(if return-type-spec
 339                 `(let ((result
 340                         ,(translate-from-alien return-type-spec alien-funcall)))
 341                    ,@(alien-deallocators)
 342                    (values result ,@(alien-values)))
 343               `(progn
 344                  ,alien-funcall
 345                  ,@(alien-deallocators)
 346                  (values ,@(alien-values)))))))))
 347
 348
 349
 350
 351 ;;;; Definitons and translations of fundamental types
 352
 353 (lisp:deftype long (&optional (min '*) (max '*)) `(integer ,min ,max))
 354 (lisp:deftype unsigned-long (&optional (min '*) (max '*)) `(integer ,min ,max))
 355 (lisp:deftype int (&optional (min '*) (max '*)) `(long ,min ,max))
 356 (lisp:deftype unsigned-int (&optional (min '*) (max '*)) `(unsigned-long ,min ,max))
 357 (lisp:deftype short (&optional (min '*) (max '*)) `(int ,min ,max))
 358 (lisp:deftype unsigned-short (&optional (min '*) (max '*)) `(unsigned-int ,min ,max))
 359 (lisp:deftype signed (&optional (size '*)) `(signed-byte ,size))
 360 (lisp:deftype unsigned (&optional (size '*)) `(signed-byte ,size))
 361 (lisp:deftype char () 'base-char)
 362 (lisp:deftype pointer () 'system-area-pointer)
 363 (lisp:deftype boolean (&optional (size '*))
 364   (declare (ignore size))
 365   `(member t nil))
 366 (lisp:deftype static (type) type)
 367 (lisp:deftype invalid () nil)
 368
 369
 370
 371 (deftype-method cleanup-alien t (type-spec alien &optional copied)
 372   (declare (ignore type-spec alien copied))
 373   nil)
 374
 375
 376 (deftype-method translate-to-alien integer (type-spec number &optional copy)
 377   (declare (ignore type-spec copy))
 378   number)
 379
 380 (deftype-method translate-from-alien integer (type-spec number &optional alloc)
 381   (declare (ignore type-spec alloc))
 382   number)
 383
 384
 385 (deftype-method translate-type-spec fixnum (type-spec)
 386   (declare (ignore type-spec))
 387   (translate-type-spec 'signed))
 388
 389 (deftype-method size-of fixnum (type-spec)
 390   (declare (ignore type-spec))
 391   (size-of 'signed))
 392
 393 (deftype-method translate-to-alien fixnum (type-spec number &optional copy)
 394   (declare (ignore type-spec copy))
 395   number)
 396
 397 (deftype-method translate-from-alien fixnum (type-spec number &optional alloc)
 398   (declare (ignore type-spec alloc))
 399   number)
 400
 401
 402 (deftype-method translate-type-spec long (type-spec)
 403   (declare (ignore type-spec))
 404   `(signed ,(* +bits-per-unit+ +size-of-long+)))
 405
 406 (deftype-method size-of long (type-spec)
 407   (declare (ignore type-spec))
 408   +size-of-long+)
 409
 410
 411 (deftype-method translate-type-spec unsigned-long (type-spec)
 412   (declare (ignore type-spec))
 413   `(unsigned ,(* +bits-per-unit+ +size-of-long+)))
 414
 415 (deftype-method size-of unsigned-long (type-spec)
 416   (declare (ignore type-spec))
 417   +size-of-long+)
 418
 419
 420 (deftype-method translate-type-spec int (type-spec)
 421   (declare (ignore type-spec))
 422   `(signed ,(* +bits-per-unit+ +size-of-int+)))
 423
 424 (deftype-method size-of int (type-spec)
 425   (declare (ignore type-spec))
 426   +size-of-int+)
 427
 428
 429 (deftype-method translate-type-spec unsigned-int (type-spec)
 430   (declare (ignore type-spec))
 431   `(signed ,(* +bits-per-unit+ +size-of-int+)))
 432
 433 (deftype-method size-of unsigned-int (type-spec)
 434   (declare (ignore type-spec))
 435   +size-of-int+)
 436
 437
 438 (deftype-method translate-type-spec short (type-spec)
 439   (declare (ignore type-spec))
 440   `(signed ,(* +bits-per-unit+ +size-of-short+)))
 441
 442 (deftype-method size-of short (type-spec)
 443   (declare (ignore type-spec))
 444   +size-of-short+)
 445
 446
 447 (deftype-method translate-type-spec unsigned-short (type-spec)
 448   (declare (ignore type-spec))
 449   `(unsigned ,(* +bits-per-unit+ +size-of-short+)))
 450
 451 (deftype-method size-of unsigned-short (type-spec)
 452   (declare (ignore type-spec))
 453   +size-of-short+)
 454
 455
 456 (deftype-method translate-type-spec signed-byte (type-spec)
 457   (let ((size (second (mklist (type-expand-to 'signed-byte type-spec)))))
 458     `(signed
 459       ,(cond
 460         ((member size '(nil *)) (* +bits-per-unit+ +size-of-int+))
 461         (t size)))))
 462
 463 (deftype-method size-of signed-byte (type-spec)
 464   (let ((size (second (mklist (type-expand-to 'signed-byte type-spec)))))
 465     (cond
 466      ((member size '(nil *)) +size-of-int+)
 467      (t (/ size +bits-per-unit+)))))
 468
 469 (deftype-method translate-to-alien signed-byte (type-spec number &optional copy)
 470   (declare (ignore type-spec copy))
 471   number)
 472
 473 (deftype-method translate-from-alien signed-byte
 474     (type-spec number &optional alloc)
 475   (declare (ignore type-spec alloc))
 476   number)
 477
 478
 479 (deftype-method translate-type-spec unsigned-byte (type-spec)
 480   (let ((size (second (mklist (type-expand-to 'unsigned-byte type-spec)))))
 481     `(signed
 482       ,(cond
 483         ((member size '(nil *)) (* +bits-per-unit+ +size-of-int+))
 484         (t size)))))
 485
 486 (deftype-method size-of unsigned-byte (type-spec)
 487   (let ((size (second (mklist (type-expand-to 'unsigned-byte type-spec)))))
 488     (cond
 489      ((member size '(nil *)) +size-of-int+)
 490      (t (/ size +bits-per-unit+)))))
 491
 492 (deftype-method translate-to-alien unsigned-byte
 493     (type-spec number &optional copy)
 494   (declare (ignore type-spec copy))
 495   number)
 496
 497 (deftype-method translate-from-alien unsigned-byte
 498     (type-spec number &optional alloc)
 499   (declare (ignore type-spec alloc))
 500   number)
 501
 502
 503 (deftype-method translate-type-spec single-float (type-spec)
 504   (declare (ignore type-spec))
 505   'single-float)
 506
 507 (deftype-method size-of single-float (type-spec)
 508   (declare (ignore type-spec))
 509   +size-of-float+)
 510
 511 (deftype-method translate-to-alien single-float
 512     (type-spec number &optional copy)
 513   (declare (ignore type-spec copy))
 514   number)
 515
 516 (deftype-method translate-from-alien single-float
 517     (type-spec number &optional alloc)
 518   (declare (ignore type-spec alloc))
 519   number)
 520
 521
 522 (deftype-method translate-type-spec double-float (type-spec)
 523   (declare (ignore type-spec))
 524   'double-float)
 525
 526 (deftype-method size-of double-float (type-spec)
 527   (declare (ignore type-spec))
 528   +size-of-double+)
 529
 530 (deftype-method translate-to-alien double-float
 531     (type-spec number &optional copy)
 532   (declare (ignore type-spec copy))
 533   number)
 534
 535 (deftype-method translate-from-alien double-float
 536     (type-spec number &optional alloc)
 537   (declare (ignore type-spec alloc))
 538   number)
 539
 540
 541 (deftype-method translate-type-spec base-char (type-spec)
 542   (declare (ignore type-spec))
 543   '(unsigned +bits-per-unit+))
 544
 545 (deftype-method size-of base-char (type-spec)
 546   (declare (ignore type-spec))
 547   1)
 548
 549 (deftype-method translate-to-alien base-char (type-spec char &optional copy)
 550   (declare (ignore type-spec copy))
 551   `(char-code ,char))
 552
 553 (deftype-method translate-from-alien base-char (type-spec code &optional alloc)
 554   (declare (ignore type-spec alloc))
 555   `(code-char ,code))
 556
 557
 558 (deftype-method translate-type-spec string (type-spec)
 559   (declare (ignore type-spec))
 560   'system-area-pointer)
 561
 562 (deftype-method size-of string (type-spec)
 563   (declare (ignore type-spec))
 564   +size-of-sap+)
 565
 566 (deftype-method translate-to-alien string (type-spec string &optional copy)
 567   (declare (ignore type-spec))
 568   (if copy
 569       `(let ((string ,string))
 570          (copy-memory
 571           (make-pointer (1+ (kernel:get-lisp-obj-address string)))
 572           (1+ (length string))))
 573     `(make-pointer (1+ (kernel:get-lisp-obj-address ,string)))))
 574
 575 (deftype-method translate-from-alien string
 576     (type-spec sap &optional (alloc :copy))
 577   (declare (ignore type-spec))
 578   `(let ((sap ,sap))
 579      (unless (null-pointer-p sap)
 580        (prog1
 581            (c-call::%naturalize-c-string sap)
 582          ;,(when (eq alloc :copy) `(deallocate-memory ,sap))
 583          ))))
 584
 585 (deftype-method cleanup-alien string (type-spec sap &optional copied)
 586   (declare (ignore type-spec))
 587   (when copied
 588     `(let ((sap ,sap))
 589        (unless (null-pointer-p sap)
 590          (deallocate-memory sap)))))
 591
 592
 593 (deftype-method translate-type-spec boolean (type-spec)
 594   (translate-type-spec
 595    (cons 'unsigned (cdr (mklist (type-expand-to 'boolean type-spec))))))
 596
 597 (deftype-method size-of boolean (type-spec)
 598   (size-of
 599    (cons 'unsigned (cdr (mklist (type-expand-to 'boolean type-spec))))))
 600
 601 (deftype-method translate-to-alien boolean (type-spec boolean &optional copy)
 602   (declare (ignore type-spec copy))
 603   `(if ,boolean 1 0))
 604
 605 (deftype-method translate-from-alien boolean (type-spec int &optional alloc)
 606   (declare (ignore type-spec alloc))
 607   `(not (zerop ,int)))
 608
 609
 610 (deftype-method translate-type-spec or (union-type)
 611   (let* ((member-types (cdr (type-expand-to 'or union-type)))
 612          (alien-type (translate-type-spec (first member-types))))
 613     (dolist (type (cdr member-types))
 614       (unless (eq alien-type (translate-type-spec type))
 615         (error "No common alien type specifier for union type: ~A" union-type)))
 616     alien-type))
 617
 618 (deftype-method size-of or (union-type)
 619   (size-of (first (cdr (type-expand-to 'or union-type)))))
 620
 621 (deftype-method translate-to-alien or (union-type-spec expr &optional copy)
 622   (destructuring-bind (name &rest type-specs)
 623       (type-expand-to 'or union-type-spec)
 624     (declare (ignore name))
 625     `(let ((value ,expr))
 626        (etypecase value
 627          ,@(map
 628             'list
 629               #'(lambda (type-spec)
 630                   (list type-spec (translate-to-alien type-spec 'value copy)))
 631               type-specs)))))
 632
 633
 634 (deftype-method translate-type-spec system-area-pointer (type-spec)
 635   (declare (ignore type-spec))
 636   'system-area-pointer)
 637
 638 (deftype-method size-of system-area-pointer (type-spec)
 639   (declare (ignore type-spec))
 640   +size-of-sap+)
 641
 642 (deftype-method translate-to-alien system-area-pointer
 643     (type-spec sap &optional copy)
 644   (declare (ignore type-spec copy))
 645   sap)
 646
 647 (deftype-method translate-from-alien system-area-pointer
 648     (type-spec sap &optional alloc)
 649   (declare (ignore type-spec alloc))
 650   sap)
 651
 652
 653 (deftype-method translate-type-spec null (type-spec)
 654   (declare (ignore type-spec))
 655   'system-area-pointer)
 656
 657 (deftype-method translate-to-alien null (type-spec expr &optional copy)
 658   (declare (ignore type-spec expr copy))
 659   `(make-pointer 0))
 660
 661
 662 (deftype-method translate-type-spec nil (type-spec)
 663   (declare (ignore type-spec))
 664   'void)
 665
 666
 667 (deftype-method transalte-type-spec static (type-spec)
 668   (translate-type-spec (second type-spec)))
 669
 670 (deftype-method size-of static (type-spec)
 671   (size-of type-spec))
 672
 673 (deftype-method translate-to-alien static (type-spec expr &optional copy)
 674   (declare (ignore copy))
 675   (translate-to-alien (second type-spec) expr nil))
 676
 677 (deftype-method translate-from-alien static (type-spec alien &optional alloc)
 678   (declare (ignore alloc))
 679   (translate-from-alien (second type-spec) alien nil))
 680
 681 (deftype-method cleanup-alien static (type-spec alien &optional copied)
 682   (declare (ignore copied))
 683   (cleanup-alien type-spec alien nil))
 684
 685
 686
 687 ;;;; Enum and flags type
 688
 689 (defun map-mappings (args op)
 690   (let ((current-value 0))
 691     (map
 692      'list
 693      #'(lambda (mapping)
 694          (destructuring-bind (symbol &optional (value current-value))
 695              (mklist mapping)
 696            (setf current-value (1+ value))
 697            (case op
 698              (:enum-int (list symbol value))
 699              (:flags-int (list symbol (ash 1 value)))
 700              (:int-enum (list value symbol))
 701              (:int-flags (list (ash 1 value) symbol))
 702              (:symbols symbol))))
 703      (if (integerp (first args))
 704          (rest args)
 705        args))))
 706
 707
 708 (lisp:deftype enum (&rest args)
 709   `(member ,@(map-mappings args :symbols)))
 710
 711 (deftype-method translate-type-spec enum (type-spec)
 712   (let ((args (cdr (type-expand-to 'enum type-spec))))
 713     (if (integerp (first args))
 714         (translate-type-spec `(signed ,(first args)))
 715       (translate-type-spec 'signed))))
 716
 717 (deftype-method size-of enum (type-spec)
 718   (let ((args (cdr (type-expand-to 'enum type-spec))))
 719     (if (integerp (first args))
 720         (size-of `(signed ,(first args)))
 721       (size-of 'signed))))
 722
 723 (deftype-method translate-to-alien enum (type-spec expr &optional copy)
 724   (declare (ignore copy))
 725   (let ((args (cdr (type-expand-to 'enum type-spec))))
 726     `(ecase ,expr
 727        ,@(map-mappings args :enum-int))))
 728
 729 (deftype-method translate-from-alien enum (type-spec expr &optional alloc)
 730   (declare (ignore alloc))
 731   (destructuring-bind (name &rest args) (type-expand-to 'enum type-spec)
 732     (declare (ignore name))
 733     `(ecase ,expr
 734        ,@(map-mappings args :int-enum))))
 735
 736
 737 (lisp:deftype flags (&rest args)
 738   `(or
 739     null
 740     (cons
 741      (member ,@(map-mappings args :symbols))
 742      list)))
 743
 744 (deftype-method translate-type-spec flags (type-spec)
 745   (let ((args (cdr (type-expand-to 'flags type-spec))))
 746     (if (integerp (first args))
 747         (translate-type-spec `(signed ,(first args)))
 748       (translate-type-spec 'signed))))
 749
 750 (deftype-method size-of flags (type-spec)
 751   (let ((args (cdr (type-expand-to 'flags type-spec))))
 752     (if (integerp (first args))
 753         (size-of `(signed ,(first args)))
 754       (size-of 'signed))))
 755
 756 (deftype-method translate-to-alien flags (type-spec expr &optional copy)
 757   (declare (ignore copy))
 758   (destructuring-bind (name &rest args) (type-expand-to 'flags type-spec)
 759     (declare (ignore name))
 760     (let ((mappings (map-mappings args :flags-int))
 761           (value (make-symbol "VALUE")))
 762       `(let ((,value 0))
 763          (dolist (flag ,expr ,value)
 764            (setq ,value (logior ,value (second (assoc flag ',mappings)))))))))
 765
 766 (deftype-method translate-from-alien flags (type-spec expr &optional alloc)
 767   (declare (ignore alloc))
 768   (destructuring-bind (name &rest args) (type-expand-to 'flags type-spec)
 769     (declare (ignore name))
 770     (let ((mappings (map-mappings args :int-flags))
 771           (result (make-symbol "RESULT")))
 772       `(let ((,result nil))
 773          (dolist (mapping ',mappings ,result)
 774            (unless (zerop (logand ,expr (first mapping)))
 775              (push (second mapping) ,result)))))))