mdw@git.distorted.org.uk Git - clg/blob - gffi/vectors.lisp

   1 ;; Common Lisp bindings for GTK+ 2.x
   2 ;; Copyright 1999-2006 Espen S. Johnsen <espen@users.sf.net>
   3 ;;
   4 ;; Permission is hereby granted, free of charge, to any person obtaining
   5 ;; a copy of this software and associated documentation files (the
   6 ;; "Software"), to deal in the Software without restriction, including
   7 ;; without limitation the rights to use, copy, modify, merge, publish,
   8 ;; distribute, sublicense, and/or sell copies of the Software, and to
   9 ;; permit persons to whom the Software is furnished to do so, subject to
  10 ;; the following conditions:
  11 ;;
  12 ;; The above copyright notice and this permission notice shall be
  13 ;; included in all copies or substantial portions of the Software.
  14 ;;
  15 ;; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  16 ;; EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  17 ;; MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  18 ;; IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
  19 ;; CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  20 ;; TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  21 ;; SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  22
  23 ;; $Id: vectors.lisp,v 1.6 2008-04-11 20:19:09 espen Exp $
  24
  25
  26 (in-package "GFFI")
  27
  28
  29 ;;; Accessor functions for raw memory access
  30
  31 (define-memory-accessor int-16)
  32 (define-memory-accessor int-32)
  33 (define-memory-accessor int-64)
  34 (define-memory-accessor uint-16)
  35 (define-memory-accessor uint-32)
  36 (define-memory-accessor uint-64)
  37 (define-memory-accessor single-float)
  38 (define-memory-accessor double-float)
  39
  40
  41 ;;; Vector
  42
  43 (defun make-c-vector (type length &key content location temp)
  44   (let* ((element-size (size-of type))
  45          (location (or location (allocate-memory (* element-size length))))
  46          (writer (writer-function type :temp temp)))
  47     (etypecase content
  48       (vector
  49        (loop
  50         for element across content
  51         for i below length
  52         for offset by element-size
  53         do (funcall writer element location offset)))
  54       (list
  55        (loop
  56         for element in content
  57         for i below length
  58         for offset by element-size
  59         do (funcall writer element location offset))))
  60     location))
  61
  62
  63 (defun map-c-vector (seqtype function location element-type length
  64                      &optional (ref :read))
  65   (let ((reader (reader-function element-type :ref ref))
  66         (element-size (size-of element-type)))
  67     (case seqtype
  68      ((nil)
  69       (loop
  70        for i below length
  71        for offset by element-size
  72        do (funcall function (funcall reader location offset))))
  73      (list
  74       (loop
  75        for i below length
  76        for offset by element-size
  77        collect (funcall function (funcall reader location offset))))
  78      (t
  79       (loop
  80        with sequence = (make-sequence seqtype length)
  81        for i below length
  82        for offset by element-size
  83        do (setf
  84            (elt sequence i)
  85            (funcall function (funcall reader location offset)))
  86        finally (return sequence))))))
  87
  88
  89 (defun unset-c-vector (location element-type length &optional temp-p)
  90   (loop
  91    with destroy = (destroy-function element-type :temp temp-p)
  92    with element-size = (size-of element-type)
  93    for i below length
  94    for offset by element-size
  95    do (funcall destroy location offset)))
  96
  97
  98 (defun destroy-c-vector (location element-type length &optional temp-p)
  99   (unset-c-vector location element-type length temp-p)
 100   (deallocate-memory location))
 101
 102
 103 (defmacro with-c-vector (var type content &body body)
 104   (let ((length (make-symbol "LENGTH")))
 105     `(let ((,length (length ,content)))
 106        (with-memory (,var (* ,(size-of type) ,length))
 107          (make-c-vector ',type ,length :content ,content :location ,var :temp t)
 108          (unwind-protect
 109              (progn ,@body)
 110            (unset-c-vector ,var ',type ,length t))))))
 111
 112
 113 (define-type-method alien-type ((type vector))
 114   (declare (ignore type))
 115   (alien-type 'pointer))
 116
 117 (define-type-method argument-type ((type vector))
 118   (declare (ignore type))
 119   'sequence)
 120
 121 (define-type-method return-type ((type vector))
 122   (destructuring-bind (element-type &optional (length '*))
 123       (rest (type-expand-to 'vector type))
 124     (if (constantp length)
 125         `(vector ,(return-type element-type) ,length)
 126       `(vector ,(return-type element-type) *))))
 127
 128 (define-type-method size-of ((type vector) &key inlined)
 129   (if inlined
 130       (destructuring-bind (element-type &optional (length '*))
 131           (rest (type-expand-to 'vector type))
 132         (if (eq length '*)
 133             (error "Can't inline vector with variable size: ~A" type)
 134           (* (size-of element-type) length)))
 135     (size-of 'pointer)))
 136
 137 (define-type-method type-alignment ((type vector) &key inlined)
 138   (if inlined
 139       (destructuring-bind (element-type &optional (length '*))
 140           (rest (type-expand-to 'vector type))
 141         (if (eq length '*)
 142             (error "Can't inline vector with variable size: ~A" type)
 143           (* (type-alignment element-type) length)))
 144     (type-alignment 'pointer)))
 145
 146 (define-type-method alien-arg-wrapper ((type vector) var vector style form &optional copy-in-p)
 147   (destructuring-bind (element-type &optional (length '*))
 148       (rest (type-expand-to 'vector type))
 149     (when (and (eq length '*) (out-arg-p style))
 150       (error "Can't use vector with variable size as return type"))
 151     (cond
 152       ((and (in-arg-p style) copy-in-p)
 153        `(with-pointer (,var `(make-c-vector ',element-type
 154                               ,(if (eq length '*) `(length ,vector) length)
 155                               :content ,vector))
 156          ,form))
 157       ((and (in-arg-p style) (not (out-arg-p style)))
 158        `(with-memory (,var ,(if (eq length '*)
 159                                 `(* ,(size-of element-type)
 160                                     (length ,vector))
 161                               `(* ,(size-of element-type) ,length)))
 162           (make-c-vector ',element-type
 163            ,(if (eq length '*) `(length ,vector) length)
 164            :content ,vector :location ,var :temp t)
 165           (unwind-protect
 166               ,form
 167             (unset-c-vector ,var ',element-type
 168              ,(if (eq length '*) `(length ,vector) length) t))))
 169       ((and (in-arg-p style) (out-arg-p style))
 170        (let ((c-vector (make-symbol "C-VECTOR")))
 171          `(with-memory (,c-vector (* ,(size-of element-type) length))
 172             (make-c-vector ',element-type ,length
 173              :content ,vector :location ,c-vector :temp t)
 174             (with-pointer (,var ,c-vector)
 175               (unwind-protect
 176                   ,form
 177                 (unset-c-vector ,c-vector ',element-type ,length t))))))
 178       ((and (out-arg-p style) (not (in-arg-p style)))
 179        `(with-pointer (,var)
 180           ,form)))))
 181
 182 ;; This will enable us specify vectors with variable length in C callbacks
 183 (define-type-method callback-wrapper ((type vector) var vector form)
 184   (funcall (find-applicable-type-method 'callback-wrapper t) type var vector form))
 185
 186 (define-type-method to-alien-form ((type vector) vector &optional copy-p)
 187   (declare (ignore copy-p))
 188   (destructuring-bind (element-type &optional (length '*))
 189       (rest (type-expand-to 'vector type))
 190     `(make-c-vector ',element-type
 191       ,(if (eq length '*) `(length ,vector) length) :content ,vector)))
 192
 193
 194 (define-type-method from-alien-form ((type vector) form &key (ref :free))
 195   (destructuring-bind (element-type &optional (length '*))
 196       (rest (type-expand-to 'vector type))
 197     (if (eq length '*)
 198         (error "Can't use vector of variable size as return type")
 199       `(let ((c-vector ,form))
 200          (prog1
 201              (map-c-vector 'vector #'identity c-vector ',element-type ,length
 202               ,(ecase ref (:free :get) ((:static :temp) :peek) (:copy :read)))
 203            ,(when (eq ref :free)
 204               `(deallocate-memory c-vector)))))))
 205
 206
 207 (define-type-method writer-function ((type vector) &key temp inlined)
 208   (destructuring-bind (element-type &optional (length '*))
 209       (rest (type-expand-to 'vector type))
 210     (if inlined
 211         (if (eq length '*)
 212             (error "Can't inline vector with variable size: ~A" type)
 213           #'(lambda (vector location &optional (offset 0))
 214               (make-c-vector element-type length
 215                :location (pointer+ location offset)
 216                :content vector :temp temp)))
 217       #'(lambda (vector location &optional (offset 0))
 218           (setf
 219            (ref-pointer location offset)
 220            (make-c-vector element-type length :content vector :temp temp))))))
 221
 222 (define-type-method reader-function ((type vector) &key (ref :read) inlined)
 223   (destructuring-bind (element-type &optional (length '*))
 224       (rest (type-expand-to 'vector type))
 225     (cond
 226      ((eq length '*)
 227       (error "Can't create reader function for vector with variable size"))
 228      (inlined
 229       #'(lambda (location &optional (offset 0))
 230           (map-c-vector 'vector #'identity (pointer+ location offset)
 231            element-type length ref)))
 232      (t
 233       (ecase ref
 234         ((:read :peek)
 235          #'(lambda (location &optional (offset 0))
 236              (unless (null-pointer-p (ref-pointer location offset))
 237                (map-c-vector 'vector #'identity (ref-pointer location offset)
 238                 element-type length ref))))
 239         (:get
 240          #'(lambda (location &optional (offset 0))
 241              (unless (null-pointer-p (ref-pointer location offset))
 242                (prog1
 243                    (map-c-vector 'vector #'identity
 244                     (ref-pointer location offset) element-type length :get)
 245                  (deallocate-memory (ref-pointer location offset))
 246                  (setf (ref-pointer location offset) (make-pointer 0)))))))))))
 247
 248 (define-type-method destroy-function ((type vector) &key temp inlined)
 249   (destructuring-bind (element-type &optional (length '*))
 250       (rest (type-expand-to 'vector type))
 251     (cond
 252      ((eq length '*)
 253       (error "Can't create destroy function for vector with variable size"))
 254      (inlined
 255       #'(lambda (location &optional (offset 0))
 256           (unset-c-vector (pointer+ location offset)
 257            element-type length temp)))
 258      (t
 259       #'(lambda (location &optional (offset 0))
 260           (unless (null-pointer-p (ref-pointer location offset))
 261             (destroy-c-vector (ref-pointer location offset)
 262              element-type length temp)
 263             (setf (ref-pointer location offset) (make-pointer 0))))))))
 264
 265 (define-type-method copy-function ((type vector) &key inlined)
 266   (destructuring-bind (element-type &optional (length '*))
 267       (rest (type-expand-to 'vector type))
 268     (cond
 269      ((eq length '*) (error "Can't copy vector with variable size: ~A" type))
 270      (inlined
 271       (let ((copy-element (copy-function element-type))
 272             (element-size (size-of element-type)))
 273         #'(lambda (from to &optional (offset 0))
 274             (loop
 275              repeat length
 276              for element from offset by element-size
 277              do (funcall copy-element from to element)))))
 278      (t
 279       (let ((size (* length (size-of element-type)))
 280             (copy-content (copy-function type :inlined t)))
 281         #'(lambda (from to &optional (offset 0))
 282             (unless (null-pointer-p (ref-pointer from offset))
 283               (let ((vector (allocate-memory size)))
 284                 (setf (ref-pointer to offset) vector)
 285                 (funcall copy-content (ref-pointer from offset) vector)))))))))
 286
 287
 288 ;;;; Null terminated vector
 289
 290 (defun make-0-vector (type &key content location temp)
 291   (let* ((element-size (size-of type))
 292          (length (length content))
 293          (location (or location (allocate-memory (* element-size (1+ length))))))
 294     (make-c-vector type length :content content :location location :temp temp)))
 295
 296
 297 (defun map-0-vector (seqtype function location element-type &optional (ref :read))
 298   (let ((reader (reader-function element-type :ref ref))
 299         (element-size (size-of element-type)))
 300     (case seqtype
 301      ((nil)
 302       (loop
 303        for offset by element-size
 304        until (memory-clear-p (pointer+ location offset) element-size)
 305        do (funcall function (funcall reader location offset))))
 306      (list
 307       (loop
 308        for offset by element-size
 309        until (memory-clear-p (pointer+ location offset) element-size)
 310        collect (funcall function (funcall reader location offset))))
 311      (t
 312       (coerce
 313        (loop
 314         for offset by element-size
 315         until (memory-clear-p (pointer+ location offset) element-size)
 316         collect (funcall function (funcall reader location offset)))
 317        seqtype)))))
 318
 319
 320 (defun unset-0-vector (location element-type &optional temp-p)
 321   (loop
 322    with destroy = (destroy-function element-type :temp temp-p)
 323    with element-size = (size-of element-type)
 324    for offset by element-size
 325    until (memory-clear-p (pointer+ location offset) element-size)
 326    do (funcall destroy location offset)))
 327
 328 (defun destroy-0-vector (location element-type &optional temp-p)
 329   (unset-0-vector location element-type temp-p)
 330   (deallocate-memory location))
 331
 332
 333 (deftype vector0 (element-type) `(vector ,element-type))
 334 (deftype null-terminated-vector (element-type) `(vector0 ,element-type))
 335
 336 (define-type-method alien-type ((type vector0))
 337   (declare (ignore type))
 338   (alien-type 'pointer))
 339
 340 (define-type-method size-of ((type vector0) &key inlined)
 341   (assert-not-inlined type inlined)
 342   (size-of 'pointer))
 343
 344 (define-type-method type-alignment ((type vector0) &key inlined)
 345   (assert-not-inlined type inlined)
 346   (type-alignment 'pointer))
 347
 348 (define-type-method alien-arg-wrapper ((type vector0) var vector style form &optional copy-in-p)
 349   (destructuring-bind (element-type) (rest (type-expand-to 'vector0 type))
 350     (cond
 351       ((and (in-arg-p style) copy-in-p)
 352        `(with-pointer (,var (make-0-vector ',element-type :content ,vector))
 353           ,form))
 354       ((and (in-arg-p style) (not (out-arg-p style)))
 355        `(with-memory (,var (* ,(size-of element-type) (1+ (length ,vector))))
 356           (make-0-vector ',element-type :content ,vector :location ,var :temp t)
 357           (unwind-protect
 358               ,form
 359             (unset-0-vector ,var ',element-type t))))
 360       ((and (in-arg-p style) (out-arg-p style))
 361        (let ((c-vector (make-symbol "C-VECTOR")))
 362          `(with-memory (,c-vector (* ,(size-of element-type) (1+ (length ,vector))))
 363             (make-0-vector ',element-type :content ,vector :location ,c-vector :temp t)
 364             (with-pointer (,var ,c-vector)
 365               (unwind-protect
 366                   ,form
 367                 (unset-0-vector ,c-vector ',element-type t))))))
 368       ((and (out-arg-p style) (not (in-arg-p style)))
 369        `(with-pointer (,var)
 370           ,form)))))
 371
 372
 373 (define-type-method to-alien-form ((type vector0) vector &optional copy-p)
 374   (declare (ignore copy-p))
 375   (destructuring-bind (element-type) (rest (type-expand-to 'vector0 type))
 376     `(make-0-vector ',element-type :content ,vector)))
 377
 378 (define-type-method from-alien-form ((type vector0) form  &key (ref :free))
 379   (destructuring-bind (element-type) (rest (type-expand-to 'vector0 type))
 380     `(let ((c-vector ,form))
 381        (prog1
 382            (map-0-vector 'vector #'identity c-vector ',element-type
 383             ,(ecase ref (:free :get) ((:static :temp) :peek) (:copy :read)))
 384          ,(when (eq ref :free)
 385             `(deallocate-memory c-vector))))))
 386
 387
 388 (define-type-method writer-function ((type vector0) &key temp inlined)
 389   (assert-not-inlined type inlined)
 390   (destructuring-bind (element-type) (rest (type-expand-to 'vector0 type))
 391     #'(lambda (vector location &optional (offset 0))
 392         (setf
 393          (ref-pointer location offset)
 394          (make-0-vector element-type :content vector :temp temp)))))
 395
 396 (define-type-method reader-function ((type vector0) &key (ref :read) inlined)
 397   (assert-not-inlined type inlined)
 398   (destructuring-bind (element-type) (rest (type-expand-to 'vector0 type))
 399     (ecase ref
 400       ((:read :peek)
 401        #'(lambda (location &optional (offset 0))
 402            (unless (null-pointer-p (ref-pointer location offset))
 403              (map-0-vector 'vector #'identity (ref-pointer location offset)
 404               element-type ref))))
 405       (:get
 406        #'(lambda (location &optional (offset 0))
 407            (unless (null-pointer-p (ref-pointer location offset))
 408              (prog1
 409                  (map-0-vector 'vector #'identity (ref-pointer location offset)
 410                   element-type :get)
 411                (deallocate-memory (ref-pointer location offset))
 412                (setf (ref-pointer location offset) (make-pointer 0)))))))))
 413
 414
 415 (define-type-method destroy-function ((type vector0) &key temp inlined)
 416   (assert-not-inlined type inlined)
 417   (destructuring-bind (element-type) (rest (type-expand-to 'vector0 type))
 418     #'(lambda (location &optional (offset 0))
 419           (unless (null-pointer-p (ref-pointer location offset))
 420             (destroy-0-vector
 421              (ref-pointer location offset) element-type temp)
 422             (setf (ref-pointer location offset) (make-pointer 0))))))
 423
 424 (define-type-method copy-function ((type vector0) &key inlined)
 425   (assert-not-inlined type inlined)
 426   (destructuring-bind (element-type) (rest (type-expand-to 'vector0 type))
 427     (let ((copy-element (copy-function element-type))
 428           (element-size (size-of element-type)))
 429       #'(lambda (from to &optional (offset 0))
 430           (unless (null-pointer-p (ref-pointer from offset))
 431             (let* ((from-vector (ref-pointer from offset))
 432                    (length
 433                     (loop
 434                      for length from 0
 435                      for element by element-size
 436                      until (memory-clear-p from-vector element-size element)
 437                      finally (return length)))
 438                    (to-vector
 439                     (setf (ref-pointer to offset)
 440                      (allocate-memory (* (1+ length) element-size)))))
 441               (loop
 442                repeat length
 443                for element by element-size
 444                do (funcall copy-element from-vector to-vector element))))))))
 445
 446 (define-type-method unbound-value ((type vector0))
 447   (declare (ignore type))
 448   nil)
 449
 450
 451
 452 ;;;; Counted vector
 453
 454 (defun make-counted-vector (type &key content location (counter-type 'unsigned-int) temp)
 455   (let* ((element-size (size-of type))
 456          (length (length content))
 457          (location (or
 458                     location
 459                     (allocate-memory
 460                      (+ (size-of counter-type) (* element-size length))))))
 461     (funcall (writer-function counter-type :temp temp) length location)
 462     (make-c-vector type length :content content :location (pointer+ location (size-of counter-type)))
 463     location))
 464
 465 (defun map-counted-vector (seqtype function location element-type &optional (counter-type 'unsigned-int) (ref :read))
 466   (let ((length (funcall (reader-function counter-type) location :ref ref)))
 467     (map-c-vector
 468      seqtype function (pointer+ location (size-of counter-type))
 469      element-type length)))
 470
 471 (defun unset-counted-vector (location element-type &optional (counter-type 'unsigned-int) temp-p)
 472   (let ((length (funcall (reader-function counter-type) location)))
 473     (unset-c-vector
 474      (pointer+ location (size-of counter-type)) element-type length temp-p)))
 475
 476 (defun destroy-counted-vector (location element-type &optional (counter-type 'unsigned-int) temp-p)
 477   (unset-counted-vector location element-type counter-type temp-p)
 478   (deallocate-memory location))
 479
 480
 481 (deftype counted-vector (element-type &optional counter-type)
 482   (declare (ignore counter-type))
 483   `(vector ,element-type))
 484
 485 (define-type-method alien-type ((type counted-vector))
 486   (declare (ignore type))
 487   (alien-type 'pointer))
 488
 489 (define-type-method size-of ((type counted-vector) &key inlined)
 490   (assert-not-inlined type inlined)
 491   (size-of 'pointer))
 492
 493 (define-type-method type-alignment ((type counted-vector) &key inlined)
 494   (assert-not-inlined type inlined)
 495   (type-alignment 'pointer))
 496
 497 (define-type-method alien-arg-wrapper ((type counted-vector) var vector style form &optional copy-in-p)
 498   (destructuring-bind (element-type &optional (counter-type 'unsigned-int))
 499       (rest (type-expand-to 'counted-vector type))
 500     (cond
 501       ((and (in-arg-p style) copy-in-p)
 502        `(with-pointer (,var (make-counted-vector ',element-type
 503                              :content ,vector :counter-type ',counter-type))
 504           ,form))
 505       ((and (in-arg-p style) (not (out-arg-p style)))
 506        `(with-memory (,var (+ (* ,(size-of element-type) (length ,vector)) ,(size-of counter-type)))
 507           (make-counted-vector ',element-type :content ,vector
 508            :location ,var :counter-type ',counter-type :temp t)
 509           (unwind-protect
 510               ,form
 511             (unset-counted-vector ,var ',element-type ',counter-type t))))
 512       ((and (in-arg-p style) (out-arg-p style))
 513        (let ((c-vector (make-symbol "C-VECTOR")))
 514          `(with-memory (,c-vector (+ (* ,(size-of element-type) (length ,vector)) ,(size-of counter-type)))
 515             (make-counted-vector ',element-type :content ,vector ,c-vector
 516              :counter-type ',counter-type :temp t)
 517             (with-pointer (,var ,c-vector)
 518               (unwind-protect
 519                   ,form
 520                 (unset-counted-vector ,c-vector ',element-type ',counter-type t))))))
 521       ((and (out-arg-p style) (not (in-arg-p style)))
 522        `(with-pointer (,var)
 523           ,form)))))
 524
 525
 526 (define-type-method to-alien-form ((type counted-vector) vector &optional copy-p)
 527   (declare (ignore copy-p))
 528   (destructuring-bind (element-type &optional (counter-type 'unsigned-int))
 529       (rest (type-expand-to 'counted-vector type))
 530     `(make-counted-vector ',element-type
 531       :content ,vector :counter-type ',counter-type)))
 532
 533 (define-type-method from-alien-form ((type counted-vector) form  &key (ref :free))
 534   (destructuring-bind (element-type &optional (counter-type 'unsigned-int))
 535       (rest (type-expand-to 'counted-vector type))
 536     `(let ((c-vector ,form))
 537        (prog1
 538            (map-counted-vector 'vector #'identity c-vector ',element-type ',counter-type
 539             ,(ecase ref (:free :get) ((:static :temp) :peek) (:copy :read)))
 540          ,(when (eq ref :free)
 541             `(deallocate c-vector))))))
 542
 543 (define-type-method writer-function ((type counted-vector) &key temp inlined)
 544   (assert-not-inlined type inlined)
 545   (destructuring-bind (element-type &optional (counter-type 'unsigned-int))
 546       (rest (type-expand-to 'counted-vector type))
 547     #'(lambda (vector location &optional (offset 0))
 548         (setf
 549          (ref-pointer location offset)
 550          (make-counted-vector element-type :content vector
 551           :counter-type counter-type :temp temp)))))
 552
 553 (define-type-method reader-function ((type counted-vector) &key (ref :read) inlined)
 554   (assert-not-inlined type inlined)
 555   (destructuring-bind (element-type &optional (counter-type 'unsigned-int))
 556       (rest (type-expand-to 'counted-vector type))
 557     (ecase ref
 558       ((:read :peek)
 559        #'(lambda (location &optional (offset 0))
 560            (unless (null-pointer-p (ref-pointer location offset))
 561              (map-counted-vector 'vector #'identity
 562               (ref-pointer location offset) element-type counter-type ref))))
 563       (:get
 564        #'(lambda (location &optional (offset 0))
 565            (unless (null-pointer-p (ref-pointer location offset))
 566              (prog1
 567                  (map-counted-vector 'vector #'identity
 568                   (ref-pointer location offset) element-type counter-type :get)
 569                (deallocate-memory (ref-pointer location offset))
 570                (setf (ref-pointer location offset) (make-pointer 0)))))))))
 571
 572 (define-type-method destroy-function ((type counted-vector) &key temp inlined)
 573   (assert-not-inlined type inlined)
 574   (destructuring-bind (element-type &optional (counter-type 'unsigned-int))
 575       (rest (type-expand-to 'counted-vector type))
 576     #'(lambda (location &optional (offset 0))
 577         (unless (null-pointer-p (ref-pointer location offset))
 578           (destroy-counted-vector (ref-pointer location offset)
 579            element-type counter-type temp)
 580           (setf (ref-pointer location offset) (make-pointer 0))))))
 581
 582 (define-type-method copy-function ((type counted-vector) &key inlined)
 583   (assert-not-inlined type inlined)
 584   (destructuring-bind (element-type &optional (counter-type 'unsigned-int))
 585       (rest (type-expand-to 'counted-vector type))
 586     (let ((vector-length (reader-function counter-type))
 587           (counter-size (size-of counter-type))
 588           (copy-element (copy-function element-type))
 589           (element-size (size-of element-type)))
 590       #'(lambda (from to &optional (offset 0))
 591           (unless (null-pointer-p (ref-pointer from offset))
 592             (let* ((from-vector (ref-pointer from offset))
 593                    (length (funcall vector-length from-vector))
 594                    (to-vector  (setf
 595                                 (ref-pointer to offset)
 596                                 (allocate-memory (+ counter-size (* length element-size))))))
 597               (copy-memory from-vector counter-size to-vector)
 598               (loop
 599                repeat length
 600                for element from counter-size by element-size
 601                do (funcall copy-element from-vector to-vector element))))))))
 602
 603
 604 ;;;; Accessor functions for raw memory access
 605
 606 (defun vector-reader-function (type &key (start 0) end)
 607   "Returns a function for reading values from raw C vectors"
 608   (let ((element-size (size-of type))
 609         (reader (reader-function type)))
 610     #'(lambda (vector index)
 611         (assert (and (>= index start) (or (not end) (< index end))))
 612         (funcall reader vector (* index element-size)))))
 613
 614 (defun vector-writer-function (type &key (start 0) end)
 615   "Returns a function for writing values to raw C vectors"
 616   (let ((element-size (size-of type))
 617         (writer (writer-function type)))
 618     #'(lambda (value vector index)
 619         (assert (and (>= index start) (or (not end) (< index end))))
 620         (funcall writer value vector (* index element-size)))))
 621
 622
 623 (defmacro define-vector-accessor (type)
 624   (let ((name (intern (format nil "VECTOR-REF-~A" type)))
 625         (ref (intern (format nil "REF-~A" type))))
 626     `(progn
 627        (declaim
 628         (ftype (function (pointer fixnum) ,type) ,name)
 629         (inline ,name))
 630        (defun ,name (vector index)
 631          (,ref vector (* ,(size-of type) index)))
 632        (declaim
 633         (ftype (function (,type pointer fixnum) ,type) (setf ,name))
 634         (inline (setf ,name)))
 635        (defun (setf ,name) (value vector index)
 636          (setf (,ref vector (* ,(size-of type) index)) value)))))
 637
 638 (define-vector-accessor int-8)
 639 (define-vector-accessor uint-8)
 640 (define-vector-accessor int-16)
 641 (define-vector-accessor uint-16)
 642 (define-vector-accessor int-32)
 643 (define-vector-accessor uint-32)
 644 (define-vector-accessor int-64)
 645 (define-vector-accessor uint-64)
 646 (define-vector-accessor double-float)
 647 (define-vector-accessor single-float)
 648