[clg] / glib / proxy.lisp

;; Common Lisp bindings for GTK+ v2.0
;; Copyright (C) 2000 Espen S. Johnsen <esj@stud.cs.uit.no>
;;
;; This library is free software; you can redistribute it and/or
;; modify it under the terms of the GNU Lesser General Public
;; License as published by the Free Software Foundation; either
;; version 2 of the License, or (at your option) any later version.
;;
;; This library is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
;; Lesser General Public License for more details.
;;
;; You should have received a copy of the GNU Lesser General Public
;; License along with this library; if not, write to the Free Software
;; Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

;; $Id: proxy.lisp,v 1.9 2004-10-28 19:29:00 espen Exp $

(in-package "GLIB")

(import 
'(pcl::initialize-internal-slot-functions
  pcl::compute-effective-slot-definition-initargs
  pcl::compute-slot-accessor-info
  pcl::reader-function pcl::writer-function pcl::boundp-function))

;;;; Superclass for all metaclasses implementing some sort of virtual slots

(eval-when (:compile-toplevel :load-toplevel :execute)
  (defclass virtual-slot-class (standard-class) 
    ())

  (defclass direct-virtual-slot-definition (standard-direct-slot-definition)
    ((setter :reader slot-definition-setter :initarg :setter)
     (getter :reader slot-definition-getter :initarg :getter)
     (boundp :reader slot-definition-boundp :initarg :boundp)))
  
  (defclass effective-virtual-slot-definition (standard-effective-slot-definition)
    ((setter :reader slot-definition-setter :initarg :setter)
     (getter :reader slot-definition-getter :initarg :getter)
     (boundp :reader slot-definition-boundp :initarg :boundp)))

  (defun most-specific-slot-value (instances slot &optional default)
    (let ((object (find-if
		   #'(lambda (ob)
		       (and (slot-exists-p ob slot) (slot-boundp ob slot)))
		   instances)))
      (if object
	  (slot-value object slot)
	  default)))
)

  
(defmethod direct-slot-definition-class ((class virtual-slot-class) &rest initargs)
  (if (eq (getf initargs :allocation) :virtual)
      (find-class 'direct-virtual-slot-definition)
    (call-next-method)))

(defmethod effective-slot-definition-class ((class virtual-slot-class) &rest initargs)
  (if (eq (getf initargs :allocation) :virtual)
      (find-class 'effective-virtual-slot-definition)
    (call-next-method)))


(defmethod initialize-internal-slot-functions ((slotd effective-virtual-slot-definition))
  (with-slots (getter setter boundp) slotd
    (unless (slot-boundp slotd 'reader-function)
      (setf 
       (slot-value slotd 'reader-function)
       (etypecase getter
	 (function getter)
	 (null #'(lambda (object)
		   (declare (ignore object))
		   (error "Can't read slot: ~A" (slot-definition-name slotd))))
	 (symbol #'(lambda (object)
		     (funcall getter object)))
	 (string (let ((reader (mkbinding-late getter 
				(slot-definition-type slotd) 'pointer)))
		   (setf (slot-value slotd 'reader-function)
			 #'(lambda (object)
			     (funcall reader (proxy-location object)))))))))

    (unless (slot-boundp slotd 'writer-function)
      (setf 
       (slot-value slotd 'writer-function)
       (etypecase setter
	 (function setter)
	 (null #'(lambda (object)
		   (declare (ignore object))
		   (error "Can't set slot: ~A" (slot-definition-name slotd))))
	 ((or symbol cons) #'(lambda (value object)
			       (funcall (fdefinition setter) value object)))
	 (string
	  (let ((writer (mkbinding-late setter 'nil 'pointer 
			 (slot-definition-type slotd))))
	    (setf (slot-value slotd 'writer-function)
		  #'(lambda (value object)
		      (funcall writer (proxy-location object) value))))))))

    (unless (slot-boundp slotd 'boundp-function)
      (setf 
       (slot-value slotd 'boundp-function)
       (etypecase boundp
	 (function boundp)
	 (null #'(lambda (object)
		   (declare (ignore object))
		   t))
	 (symbol #'(lambda (object)
		     (funcall boundp object)))))))
  (initialize-internal-slot-gfs (slot-definition-name slotd)))


(defmethod compute-slot-accessor-info ((slotd effective-virtual-slot-definition)
					    type gf)
  nil)

(defmethod compute-effective-slot-definition-initargs ((class virtual-slot-class) direct-slotds)
  (if (eq (most-specific-slot-value direct-slotds 'allocation) :virtual)
      (nconc 
       (list :getter (most-specific-slot-value direct-slotds 'getter)
	     :setter (most-specific-slot-value direct-slotds 'setter)
	     :boundp (most-specific-slot-value direct-slotds 'boundp))
       (call-next-method))
    (call-next-method)))


(defmethod slot-value-using-class
    ((class virtual-slot-class) (object standard-object)
     (slotd effective-virtual-slot-definition))
  (if (funcall (slot-value slotd 'boundp-function) object)
      (funcall (slot-value slotd 'reader-function) object)
    (slot-unbound class object (slot-definition-name slotd))))

(defmethod slot-boundp-using-class
    ((class virtual-slot-class) (object standard-object)
     (slotd effective-virtual-slot-definition))
  (funcall (slot-value slotd 'boundp-function) object))
  
(defmethod (setf slot-value-using-class) 
    (value (class virtual-slot-class) (object standard-object)
     (slotd effective-virtual-slot-definition))
  (funcall (slot-value slotd 'writer-function) value object))

  
(defmethod validate-superclass
    ((class virtual-slot-class) (super standard-class))
  t)


;;;; Proxy cache

(internal *instance-cache*)
(defvar *instance-cache* (make-hash-table :test #'eql))

(defun cache-instance (instance)
  (setf
   (gethash (system:sap-int (proxy-location instance)) *instance-cache*)
   (ext:make-weak-pointer instance)))

(defun find-cached-instance (location)
  (let ((ref (gethash (system:sap-int location) *instance-cache*)))
    (when ref
      (ext:weak-pointer-value ref))))

(defun remove-cached-instance (location)
  (remhash (system:sap-int location) *instance-cache*))


;;;; Proxy for alien instances

(eval-when (:compile-toplevel :load-toplevel :execute)
  (defclass proxy ()
    ((location :reader proxy-location :type system-area-pointer)))

  (defgeneric initialize-proxy (object &rest initargs))
  (defgeneric instance-finalizer (object)))


(defmethod initialize-instance :after ((instance proxy)
				       &rest initargs &key)
  (declare (ignore initargs))
  (cache-instance instance)
  (ext:finalize instance (instance-finalizer instance)))

(defmethod initialize-proxy ((instance proxy)
			     &rest initargs &key location weak-ref)
  (declare (ignore initargs))
  (setf 
   (slot-value instance 'location)
   (if weak-ref
       (funcall
	(proxy-class-copy (class-of instance))
	(type-of instance) location)
     location))
  (cache-instance instance)
  (ext:finalize instance (instance-finalizer instance)))

(defmethod instance-finalizer ((instance proxy))
  (let ((class (class-of instance))
	(type (type-of instance))
	(location (proxy-location instance)))
    (declare (type symbol type) (type system-area-pointer location))
    (let ((free (proxy-class-free class)))
      #'(lambda ()
	  (funcall free type location)
	  (remove-cached-instance location)))))


(deftype-method translate-type-spec proxy (type-spec)
  (declare (ignore type-spec))
  (translate-type-spec 'pointer))

(deftype-method size-of proxy (type-spec)
  (declare (ignore type-spec))
  (size-of 'pointer))

(deftype-method translate-from-alien
    proxy (type-spec location &optional weak-ref)
  `(let ((location ,location))
     (unless (null-pointer-p location)
       (ensure-proxy-instance ',type-spec location ,weak-ref))))

(deftype-method translate-to-alien
    proxy (type-spec instance &optional weak-ref)
  (if weak-ref
      `(proxy-location ,instance)
      (let ((copy (proxy-class-copy (find-class type-spec)))) 
	(if (symbolp copy)
	    `(,copy ',type-spec (proxy-location ,instance))    
	`(funcall ',copy ',type-spec (proxy-location ,instance))))))

(deftype-method unreference-alien proxy (type-spec location)
  (let ((free (proxy-class-free (find-class type-spec)))) 
    (if (symbolp free)
	`(,free ',type-spec ,location)
    `(funcall ',free ',type-spec ,location))))


;;;; Metaclass used for subclasses of proxy

(eval-when (:compile-toplevel :load-toplevel :execute)
  (defclass proxy-class (virtual-slot-class)
    ((size :reader proxy-class-size)
     (copy :reader proxy-class-copy)
     (free :reader proxy-class-free)))

  (defclass direct-alien-slot-definition (direct-virtual-slot-definition)
    ((allocation :initform :alien)
     (offset :reader slot-definition-offset :initarg :offset)))
  
  (defclass effective-alien-slot-definition (effective-virtual-slot-definition)
    ((offset :reader slot-definition-offset :initarg :offset)))


  (defmethod most-specific-proxy-superclass ((class proxy-class))
    (find-if
     #'(lambda (class)
	 (subtypep (class-name class) 'proxy))
     (cdr (compute-class-precedence-list class))))
  
  (defmethod direct-proxy-superclass ((class proxy-class))
    (find-if
     #'(lambda (class)
	 (subtypep (class-name class) 'proxy))
     (class-direct-superclasses class)))
  
  (defmethod shared-initialize ((class proxy-class) names
				&rest initargs &key size copy free)
    (declare (ignore initargs))
    (call-next-method)
    (cond
      (size (setf (slot-value class 'size) (first size)))
      ((slot-boundp class 'size) (slot-makunbound class 'size)))
    (cond
      (copy (setf (slot-value class 'copy) (first copy)))
      ((slot-boundp class 'copy) (slot-makunbound class 'copy)))
    (cond
      (free (setf (slot-value class 'free) (first free)))
      ((slot-boundp class 'free) (slot-makunbound class 'free))))
  
  (defmethod shared-initialize :after ((class proxy-class) names &rest initargs)
    (let ((super (most-specific-proxy-superclass class)))
      (unless (or (not super) (eq super (find-class 'proxy)))
	(unless (or (slot-boundp class 'copy) (not (slot-boundp super 'copy)))
	  (setf (slot-value class 'copy) (proxy-class-copy super)))
	(unless (or (slot-boundp class 'free) (not (slot-boundp super 'free)))
	  (setf (slot-value class 'free) (proxy-class-free super))))))
  
  (defmethod direct-slot-definition-class ((class proxy-class) &rest initargs)
    (case (getf initargs :allocation)
      ((nil :alien) (find-class 'direct-alien-slot-definition))
      (t (call-next-method))))
  
  (defmethod effective-slot-definition-class ((class proxy-class) &rest initargs)
    (case (getf initargs :allocation)
      (:alien (find-class 'effective-alien-slot-definition))
      (t (call-next-method))))
  
  
  (defmethod compute-effective-slot-definition-initargs ((class proxy-class) direct-slotds)
    (if (eq (most-specific-slot-value direct-slotds 'allocation) :alien)
	(nconc 
	 (list :offset (most-specific-slot-value direct-slotds 'offset))
	 (call-next-method))
      (call-next-method)))
  

  (defmethod initialize-internal-slot-functions ((slotd effective-alien-slot-definition))
    (with-slots (offset) slotd
      (let* ((type (slot-definition-type slotd))
	     (reader (intern-reader-function type))
	     (writer (intern-writer-function type))
	     (destroy (intern-destroy-function type)))
	(unless (slot-boundp slotd 'reader-function)
	  (setf 
	   (slot-value slotd 'reader-function)
	   #'(lambda (object)
	       (funcall reader (proxy-location object) offset))))

	(unless (slot-boundp slotd 'writer-function)
	  (setf 
	   (slot-value slotd 'writer-function)
	   #'(lambda (value object)
	       (let ((location (proxy-location object)))
		 (funcall destroy location offset)
		 (funcall writer value location offset)))))

	(unless (slot-boundp slotd 'boundp-function)
	  (setf 
	   (slot-value slotd 'boundp-function)
	   #'(lambda (object)
	       (declare (ignore object))
	       t)))))
    (call-next-method))
  

  ;; TODO: call some C code to detect this a compile time
  (defconstant +struct-alignmen+ 4)

  (defmethod compute-slots ((class proxy-class))
    ;; This stuff should really go somewhere else
    (loop 
     with offset = (proxy-class-size (most-specific-proxy-superclass class))
     with size = offset
     for slotd in (class-direct-slots class)
     when (eq (slot-definition-allocation slotd) :alien)
     do (if (not (slot-boundp slotd 'offset))
	    (setf (slot-value slotd 'offset) offset)
	  (setq offset (slot-value slotd 'offset)))

        (incf offset (size-of (slot-definition-type slotd)))
	(incf offset (mod offset +struct-alignmen+))
	(setq size (max size offset))

     finally (unless (slot-boundp class 'size)
	       (setf (slot-value class 'size) size)))
    (call-next-method))

  
  (defmethod validate-superclass ((class proxy-class) (super standard-class))
    (subtypep (class-name super) 'proxy))
  
  (defmethod proxy-class-size (class)
    (declare (ignore class))
    0)
)
  
(defgeneric make-proxy-instance (class location weak-ref
				       &rest initargs &key));)

(defmethod make-proxy-instance ((class symbol) location weak-ref
				&rest initargs &key)
  (apply #'make-proxy-instance (find-class class) location weak-ref initargs))

(defmethod make-proxy-instance ((class proxy-class) location weak-ref
				&rest initargs &key)
  (let ((instance (allocate-instance class)))
    (apply
     #'initialize-proxy
     instance :location location :weak-ref weak-ref initargs)
    instance))

(defun ensure-proxy-instance (class location weak-ref &rest initargs)
  (or
   (find-cached-instance location)
   (apply #'make-proxy-instance class location weak-ref initargs)))


;;;; Superclasses for wrapping of C structures

(eval-when (:compile-toplevel :load-toplevel :execute)
  (defclass struct (proxy)
    ()
    (:metaclass proxy-class)
    (:copy %copy-struct)
    (:free %free-struct)))

(defmethod initialize-instance ((structure struct) &rest initargs)
  (declare (ignore initargs))
  (setf 
   (slot-value structure 'location)
   (allocate-memory (proxy-class-size (class-of structure))))
  (call-next-method))


(defun %copy-struct (type location)
  (copy-memory location (proxy-class-size (find-class type))))

(defun %free-struct (type location)
  (declare (ignore type))
  (deallocate-memory location))


;(eval-when (:compile-toplevel :load-toplevel :execute)
  (defclass static (struct)
    ()
    (:metaclass proxy-class)
    (:copy %copy-static)
    (:free %free-static));)

(defun %copy-static (type location)
  (declare (ignore type))
  location)

(defun %free-static (type location)
  (declare (ignore type location))
  nil)
Commit	Line	Data
94f15c3c	1	;; Common Lisp bindings for GTK+ v2.0
	2	;; Copyright (C) 2000 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
7d1ddc9e	18	;; $Id: proxy.lisp,v 1.9 2004-10-28 19:29:00 espen Exp $
94f15c3c	19
	20	(in-package "GLIB")
	21
4d83a8a6	22	(import
	23	'(pcl::initialize-internal-slot-functions
	24	pcl::compute-effective-slot-definition-initargs
	25	pcl::compute-slot-accessor-info
	26	pcl::reader-function pcl::writer-function pcl::boundp-function))
94f15c3c	27
	28	;;;; Superclass for all metaclasses implementing some sort of virtual slots
	29
	30	(eval-when (:compile-toplevel :load-toplevel :execute)
4d83a8a6	31	(defclass virtual-slot-class (standard-class)
4d83a8a6	32	())
94f15c3c	33
94f15c3c	34	(defclass direct-virtual-slot-definition (standard-direct-slot-definition)
12d0437e	35	((setter :reader slot-definition-setter :initarg :setter)
4d83a8a6	36	(getter :reader slot-definition-getter :initarg :getter)
4d83a8a6	37	(boundp :reader slot-definition-boundp :initarg :boundp)))
94f15c3c	38
4d83a8a6	39	(defclass effective-virtual-slot-definition (standard-effective-slot-definition)
	40	((setter :reader slot-definition-setter :initarg :setter)
	41	(getter :reader slot-definition-getter :initarg :getter)
	42	(boundp :reader slot-definition-boundp :initarg :boundp)))
	43
	44	(defun most-specific-slot-value (instances slot &optional default)
	45	(let ((object (find-if
	46	#'(lambda (ob)
	47	(and (slot-exists-p ob slot) (slot-boundp ob slot)))
	48	instances)))
	49	(if object
	50	(slot-value object slot)
	51	default)))
	52	)
	53
94f15c3c	54
94f15c3c	55
4d83a8a6	56	(defmethod direct-slot-definition-class ((class virtual-slot-class) &rest initargs)
94f15c3c	57	(if (eq (getf initargs :allocation) :virtual)
	58	(find-class 'direct-virtual-slot-definition)
	59	(call-next-method)))
	60
4d83a8a6	61	(defmethod effective-slot-definition-class ((class virtual-slot-class) &rest initargs)
94f15c3c	62	(if (eq (getf initargs :allocation) :virtual)
	63	(find-class 'effective-virtual-slot-definition)
	64	(call-next-method)))
	65
4d83a8a6	66
	67	(defmethod initialize-internal-slot-functions ((slotd effective-virtual-slot-definition))
	68	(with-slots (getter setter boundp) slotd
	69	(unless (slot-boundp slotd 'reader-function)
	70	(setf
	71	(slot-value slotd 'reader-function)
	72	(etypecase getter
	73	(function getter)
	74	(null #'(lambda (object)
	75	(declare (ignore object))
	76	(error "Can't read slot: ~A" (slot-definition-name slotd))))
	77	(symbol #'(lambda (object)
7d1ddc9e	78	(funcall getter object)))
	79	(string (let ((reader (mkbinding-late getter
	80	(slot-definition-type slotd) 'pointer)))
	81	(setf (slot-value slotd 'reader-function)
	82	#'(lambda (object)
	83	(funcall reader (proxy-location object)))))))))
4d83a8a6	84
	85	(unless (slot-boundp slotd 'writer-function)
	86	(setf
	87	(slot-value slotd 'writer-function)
	88	(etypecase setter
	89	(function setter)
	90	(null #'(lambda (object)
	91	(declare (ignore object))
	92	(error "Can't set slot: ~A" (slot-definition-name slotd))))
	93	((or symbol cons) #'(lambda (value object)
7d1ddc9e	94	(funcall (fdefinition setter) value object)))
	95	(string
	96	(let ((writer (mkbinding-late setter 'nil 'pointer
	97	(slot-definition-type slotd))))
	98	(setf (slot-value slotd 'writer-function)
	99	#'(lambda (value object)
	100	(funcall writer (proxy-location object) value))))))))
4d83a8a6	101
	102	(unless (slot-boundp slotd 'boundp-function)
	103	(setf
	104	(slot-value slotd 'boundp-function)
	105	(etypecase boundp
	106	(function boundp)
	107	(null #'(lambda (object)
	108	(declare (ignore object))
	109	t))
	110	(symbol #'(lambda (object)
	111	(funcall boundp object)))))))
	112	(initialize-internal-slot-gfs (slot-definition-name slotd)))
	113
	114
	115
	116	(defmethod compute-slot-accessor-info ((slotd effective-virtual-slot-definition)
	117	type gf)
	118	nil)
	119
	120	(defmethod compute-effective-slot-definition-initargs ((class virtual-slot-class) direct-slotds)
	121	(if (eq (most-specific-slot-value direct-slotds 'allocation) :virtual)
	122	(nconc
	123	(list :getter (most-specific-slot-value direct-slotds 'getter)
	124	:setter (most-specific-slot-value direct-slotds 'setter)
	125	:boundp (most-specific-slot-value direct-slotds 'boundp))
	126	(call-next-method))
	127	(call-next-method)))
	128
94f15c3c	129
94f15c3c	130	(defmethod slot-value-using-class
12d0437e	131	((class virtual-slot-class) (object standard-object)
94f15c3c	132	(slotd effective-virtual-slot-definition))
4d83a8a6	133	(if (funcall (slot-value slotd 'boundp-function) object)
	134	(funcall (slot-value slotd 'reader-function) object)
	135	(slot-unbound class object (slot-definition-name slotd))))
94f15c3c	136
94f15c3c	137	(defmethod slot-boundp-using-class
12d0437e	138	((class virtual-slot-class) (object standard-object)
94f15c3c	139	(slotd effective-virtual-slot-definition))
4d83a8a6	140	(funcall (slot-value slotd 'boundp-function) object))
	141
	142	(defmethod (setf slot-value-using-class)
12d0437e	143	(value (class virtual-slot-class) (object standard-object)
94f15c3c	144	(slotd effective-virtual-slot-definition))
4d83a8a6	145	(funcall (slot-value slotd 'writer-function) value object))
	146
	147
94f15c3c	148	(defmethod validate-superclass
4d83a8a6	149	((class virtual-slot-class) (super standard-class))
94f15c3c	150	t)
	151
	152
	153	;;;; Proxy cache
	154
	155	(internal instance-cache)
	156	(defvar instance-cache (make-hash-table :test #'eql))
	157
	158	(defun cache-instance (instance)
	159	(setf
	160	(gethash (system:sap-int (proxy-location instance)) instance-cache)
	161	(ext:make-weak-pointer instance)))
	162
	163	(defun find-cached-instance (location)
	164	(let ((ref (gethash (system:sap-int location) instance-cache)))
	165	(when ref
	166	(ext:weak-pointer-value ref))))
	167
	168	(defun remove-cached-instance (location)
	169	(remhash (system:sap-int location) instance-cache))
	170
	171
	172
	173	;;;; Proxy for alien instances
	174
	175	(eval-when (:compile-toplevel :load-toplevel :execute)
	176	(defclass proxy ()
12d0437e	177	((location :reader proxy-location :type system-area-pointer)))
94f15c3c	178
	179	(defgeneric initialize-proxy (object &rest initargs))
	180	(defgeneric instance-finalizer (object)))
	181
	182
	183	(defmethod initialize-instance :after ((instance proxy)
	184	&rest initargs &key)
	185	(declare (ignore initargs))
	186	(cache-instance instance)
	187	(ext:finalize instance (instance-finalizer instance)))
	188
94f15c3c	189	(defmethod initialize-proxy ((instance proxy)
12d0437e	190	&rest initargs &key location weak-ref)
94f15c3c	191	(declare (ignore initargs))
12d0437e	192	(setf
	193	(slot-value instance 'location)
	194	(if weak-ref
	195	(funcall
	196	(proxy-class-copy (class-of instance))
	197	(type-of instance) location)
	198	location))
	199	(cache-instance instance)
	200	(ext:finalize instance (instance-finalizer instance)))
94f15c3c	201
94f15c3c	202	(defmethod instance-finalizer ((instance proxy))
4d83a8a6	203	(let ((class (class-of instance))
12d0437e	204	(type (type-of instance))
12d0437e	205	(location (proxy-location instance)))
4d83a8a6	206	(declare (type symbol type) (type system-area-pointer location))
	207	(let ((free (proxy-class-free class)))
	208	#'(lambda ()
	209	(funcall free type location)
	210	(remove-cached-instance location)))))
94f15c3c	211
	212
	213	(deftype-method translate-type-spec proxy (type-spec)
	214	(declare (ignore type-spec))
	215	(translate-type-spec 'pointer))
	216
	217	(deftype-method size-of proxy (type-spec)
	218	(declare (ignore type-spec))
	219	(size-of 'pointer))
	220
	221	(deftype-method translate-from-alien
	222	proxy (type-spec location &optional weak-ref)
	223	`(let ((location ,location))
	224	(unless (null-pointer-p location)
	225	(ensure-proxy-instance ',type-spec location ,weak-ref))))
	226
12d0437e	227	(deftype-method translate-to-alien
	228	proxy (type-spec instance &optional weak-ref)
	229	(if weak-ref
	230	`(proxy-location ,instance)
4d83a8a6	231	(let ((copy (proxy-class-copy (find-class type-spec))))
	232	(if (symbolp copy)
	233	`(,copy ',type-spec (proxy-location ,instance))
	234	`(funcall ',copy ',type-spec (proxy-location ,instance))))))
94f15c3c	235
12d0437e	236	(deftype-method unreference-alien proxy (type-spec location)
4d83a8a6	237	(let ((free (proxy-class-free (find-class type-spec))))
	238	(if (symbolp free)
	239	`(,free ',type-spec ,location)
	240	`(funcall ',free ',type-spec ,location))))
12d0437e	241
94f15c3c	242
	243	;;;; Metaclass used for subclasses of proxy
	244
	245	(eval-when (:compile-toplevel :load-toplevel :execute)
12d0437e	246	(defclass proxy-class (virtual-slot-class)
	247	((size :reader proxy-class-size)
	248	(copy :reader proxy-class-copy)
	249	(free :reader proxy-class-free)))
94f15c3c	250
94f15c3c	251	(defclass direct-alien-slot-definition (direct-virtual-slot-definition)
12d0437e	252	((allocation :initform :alien)
12d0437e	253	(offset :reader slot-definition-offset :initarg :offset)))
94f15c3c	254
94f15c3c	255	(defclass effective-alien-slot-definition (effective-virtual-slot-definition)
4d83a8a6	256	((offset :reader slot-definition-offset :initarg :offset)))
12d0437e	257
94f15c3c	258
	259	(defmethod most-specific-proxy-superclass ((class proxy-class))
	260	(find-if
	261	#'(lambda (class)
	262	(subtypep (class-name class) 'proxy))
4d83a8a6	263	(cdr (compute-class-precedence-list class))))
4d83a8a6	264
12d0437e	265	(defmethod direct-proxy-superclass ((class proxy-class))
	266	(find-if
	267	#'(lambda (class)
	268	(subtypep (class-name class) 'proxy))
4d83a8a6	269	(class-direct-superclasses class)))
4d83a8a6	270
94f15c3c	271	(defmethod shared-initialize ((class proxy-class) names
12d0437e	272	&rest initargs &key size copy free)
94f15c3c	273	(declare (ignore initargs))
94f15c3c	274	(call-next-method)
12d0437e	275	(cond
4d83a8a6	276	(size (setf (slot-value class 'size) (first size)))
4d83a8a6	277	((slot-boundp class 'size) (slot-makunbound class 'size)))
12d0437e	278	(cond
4d83a8a6	279	(copy (setf (slot-value class 'copy) (first copy)))
4d83a8a6	280	((slot-boundp class 'copy) (slot-makunbound class 'copy)))
12d0437e	281	(cond
4d83a8a6	282	(free (setf (slot-value class 'free) (first free)))
	283	((slot-boundp class 'free) (slot-makunbound class 'free))))
	284
4d83a8a6	285	(defmethod shared-initialize :after ((class proxy-class) names &rest initargs)
3e15002d	286	(let ((super (most-specific-proxy-superclass class)))
3e15002d	287	(unless (or (not super) (eq super (find-class 'proxy)))
4d83a8a6	288	(unless (or (slot-boundp class 'copy) (not (slot-boundp super 'copy)))
	289	(setf (slot-value class 'copy) (proxy-class-copy super)))
	290	(unless (or (slot-boundp class 'free) (not (slot-boundp super 'free)))
	291	(setf (slot-value class 'free) (proxy-class-free super))))))
	292
	293	(defmethod direct-slot-definition-class ((class proxy-class) &rest initargs)
94f15c3c	294	(case (getf initargs :allocation)
94f15c3c	295	((nil :alien) (find-class 'direct-alien-slot-definition))
94f15c3c	296	(t (call-next-method))))
4d83a8a6	297
4d83a8a6	298	(defmethod effective-slot-definition-class ((class proxy-class) &rest initargs)
94f15c3c	299	(case (getf initargs :allocation)
94f15c3c	300	(:alien (find-class 'effective-alien-slot-definition))
94f15c3c	301	(t (call-next-method))))
94f15c3c	302
4d83a8a6	303
	304	(defmethod compute-effective-slot-definition-initargs ((class proxy-class) direct-slotds)
	305	(if (eq (most-specific-slot-value direct-slotds 'allocation) :alien)
	306	(nconc
	307	(list :offset (most-specific-slot-value direct-slotds 'offset))
	308	(call-next-method))
	309	(call-next-method)))
	310
	311
	312	(defmethod initialize-internal-slot-functions ((slotd effective-alien-slot-definition))
	313	(with-slots (offset) slotd
	314	(let* ((type (slot-definition-type slotd))
	315	(reader (intern-reader-function type))
	316	(writer (intern-writer-function type))
	317	(destroy (intern-destroy-function type)))
	318	(unless (slot-boundp slotd 'reader-function)
	319	(setf
	320	(slot-value slotd 'reader-function)
	321	#'(lambda (object)
	322	(funcall reader (proxy-location object) offset))))
	323
	324	(unless (slot-boundp slotd 'writer-function)
	325	(setf
	326	(slot-value slotd 'writer-function)
	327	#'(lambda (value object)
	328	(let ((location (proxy-location object)))
	329	(funcall destroy location offset)
	330	(funcall writer value location offset)))))
	331
	332	(unless (slot-boundp slotd 'boundp-function)
	333	(setf
	334	(slot-value slotd 'boundp-function)
	335	#'(lambda (object)
	336	(declare (ignore object))
	337	t)))))
	338	(call-next-method))
	339
	340
4d83a8a6	341	;; TODO: call some C code to detect this a compile time
4d83a8a6	342	(defconstant +struct-alignmen+ 4)
94f15c3c	343
94f15c3c	344	(defmethod compute-slots ((class proxy-class))
4d83a8a6	345	;; This stuff should really go somewhere else
	346	(loop
	347	with offset = (proxy-class-size (most-specific-proxy-superclass class))
	348	with size = offset
	349	for slotd in (class-direct-slots class)
	350	when (eq (slot-definition-allocation slotd) :alien)
	351	do (if (not (slot-boundp slotd 'offset))
	352	(setf (slot-value slotd 'offset) offset)
	353	(setq offset (slot-value slotd 'offset)))
	354
	355	(incf offset (size-of (slot-definition-type slotd)))
	356	(incf offset (mod offset +struct-alignmen+))
	357	(setq size (max size offset))
	358
	359	finally (unless (slot-boundp class 'size)
	360	(setf (slot-value class 'size) size)))
94f15c3c	361	(call-next-method))
3e15002d	362
4d83a8a6	363
	364	(defmethod validate-superclass ((class proxy-class) (super standard-class))
	365	(subtypep (class-name super) 'proxy))
	366
12d0437e	367	(defmethod proxy-class-size (class)
	368	(declare (ignore class))
	369	0)
4d83a8a6	370	)
	371
	372	(defgeneric make-proxy-instance (class location weak-ref
	373	&rest initargs &key));)
94f15c3c	374
	375	(defmethod make-proxy-instance ((class symbol) location weak-ref
	376	&rest initargs &key)
	377	(apply #'make-proxy-instance (find-class class) location weak-ref initargs))
	378
	379	(defmethod make-proxy-instance ((class proxy-class) location weak-ref
	380	&rest initargs &key)
	381	(let ((instance (allocate-instance class)))
	382	(apply
	383	#'initialize-proxy
	384	instance :location location :weak-ref weak-ref initargs)
	385	instance))
	386
	387	(defun ensure-proxy-instance (class location weak-ref &rest initargs)
	388	(or
	389	(find-cached-instance location)
	390	(apply #'make-proxy-instance class location weak-ref initargs)))
	391
	392
12d0437e	393
12d0437e	394	;;;; Superclasses for wrapping of C structures
94f15c3c	395
94f15c3c	396	(eval-when (:compile-toplevel :load-toplevel :execute)
12d0437e	397	(defclass struct (proxy)
94f15c3c	398	()
94f15c3c	399	(:metaclass proxy-class)
12d0437e	400	(:copy %copy-struct)
12d0437e	401	(:free %free-struct)))
94f15c3c	402
4d83a8a6	403	(defmethod initialize-instance ((structure struct) &rest initargs)
94f15c3c	404	(declare (ignore initargs))
	405	(setf
	406	(slot-value structure 'location)
12d0437e	407	(allocate-memory (proxy-class-size (class-of structure))))
94f15c3c	408	(call-next-method))
	409
	410
12d0437e	411	(defun %copy-struct (type location)
12d0437e	412	(copy-memory location (proxy-class-size (find-class type))))
94f15c3c	413
12d0437e	414	(defun %free-struct (type location)
	415	(declare (ignore type))
	416	(deallocate-memory location))
94f15c3c	417
94f15c3c	418
3e15002d	419	;(eval-when (:compile-toplevel :load-toplevel :execute)
12d0437e	420	(defclass static (struct)
12d0437e	421	()
3e15002d	422	(:metaclass proxy-class)
	423	(:copy %copy-static)
	424	(:free %free-static));)
94f15c3c	425
12d0437e	426	(defun %copy-static (type location)
	427	(declare (ignore type))
	428	location)
94f15c3c	429
12d0437e	430	(defun %free-static (type location)
	431	(declare (ignore type location))
	432	nil)