[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 1.8 2004-10-27 14:59:00 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))))))

    (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))))))

    (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))))

;; (defun proxy-instance-size (proxy)
;;   (proxy-class-size (class-of proxy)))

;;;; 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)))
  
  (defclass effective-virtual-alien-slot-definition (effective-virtual-slot-definition)
    ())


  (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 finalize-inheritance ((class proxy-class))
;;     (call-next-method)
  (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))
      (:virtual (find-class 'effective-virtual-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))
  

  (defmethod initialize-internal-slot-functions ((slotd effective-virtual-alien-slot-definition))
    (with-slots (getter setter type) slotd
      (when (and (not (slot-boundp slotd 'reader-function)) (stringp getter))
	(let ((reader (mkbinding-late getter type 'pointer)))
	  (setf (slot-value slotd 'reader-function)
		#'(lambda (object)
		    (funcall reader (proxy-location object))))))
      
      (when (and (not (slot-boundp slotd 'writer-function)) (stringp setter))
	(let ((writer (mkbinding-late setter 'nil 'pointer type)))
	  (setf (slot-value slotd 'writer-function)
		#'(lambda (value object)
		    (funcall writer (proxy-location object) value))))))
    (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
4d83a8a6	18	;; $Id: proxy.lisp,v 1.8 2004-10-27 14:59:00 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)
	78	(funcall getter object))))))
	79
	80	(unless (slot-boundp slotd 'writer-function)
	81	(setf
	82	(slot-value slotd 'writer-function)
	83	(etypecase setter
	84	(function setter)
	85	(null #'(lambda (object)
	86	(declare (ignore object))
	87	(error "Can't set slot: ~A" (slot-definition-name slotd))))
	88	((or symbol cons) #'(lambda (value object)
	89	(funcall (fdefinition setter) value object))))))
	90
	91	(unless (slot-boundp slotd 'boundp-function)
	92	(setf
	93	(slot-value slotd 'boundp-function)
	94	(etypecase boundp
	95	(function boundp)
	96	(null #'(lambda (object)
	97	(declare (ignore object))
	98	t))
	99	(symbol #'(lambda (object)
	100	(funcall boundp object)))))))
	101	(initialize-internal-slot-gfs (slot-definition-name slotd)))
	102
	103
	104
	105	(defmethod compute-slot-accessor-info ((slotd effective-virtual-slot-definition)
	106	type gf)
	107	nil)
	108
	109	(defmethod compute-effective-slot-definition-initargs ((class virtual-slot-class) direct-slotds)
	110	(if (eq (most-specific-slot-value direct-slotds 'allocation) :virtual)
	111	(nconc
	112	(list :getter (most-specific-slot-value direct-slotds 'getter)
	113	:setter (most-specific-slot-value direct-slotds 'setter)
	114	:boundp (most-specific-slot-value direct-slotds 'boundp))
	115	(call-next-method))
	116	(call-next-method)))
	117
94f15c3c	118
94f15c3c	119	(defmethod slot-value-using-class
12d0437e	120	((class virtual-slot-class) (object standard-object)
94f15c3c	121	(slotd effective-virtual-slot-definition))
4d83a8a6	122	(if (funcall (slot-value slotd 'boundp-function) object)
	123	(funcall (slot-value slotd 'reader-function) object)
	124	(slot-unbound class object (slot-definition-name slotd))))
94f15c3c	125
94f15c3c	126	(defmethod slot-boundp-using-class
12d0437e	127	((class virtual-slot-class) (object standard-object)
94f15c3c	128	(slotd effective-virtual-slot-definition))
4d83a8a6	129	(funcall (slot-value slotd 'boundp-function) object))
	130
	131	(defmethod (setf slot-value-using-class)
12d0437e	132	(value (class virtual-slot-class) (object standard-object)
94f15c3c	133	(slotd effective-virtual-slot-definition))
4d83a8a6	134	(funcall (slot-value slotd 'writer-function) value object))
	135
	136
94f15c3c	137	(defmethod validate-superclass
4d83a8a6	138	((class virtual-slot-class) (super standard-class))
94f15c3c	139	t)
	140
	141
	142	;;;; Proxy cache
	143
	144	(internal instance-cache)
	145	(defvar instance-cache (make-hash-table :test #'eql))
	146
	147	(defun cache-instance (instance)
	148	(setf
	149	(gethash (system:sap-int (proxy-location instance)) instance-cache)
	150	(ext:make-weak-pointer instance)))
	151
	152	(defun find-cached-instance (location)
	153	(let ((ref (gethash (system:sap-int location) instance-cache)))
	154	(when ref
	155	(ext:weak-pointer-value ref))))
	156
	157	(defun remove-cached-instance (location)
	158	(remhash (system:sap-int location) instance-cache))
	159
	160
	161
	162	;;;; Proxy for alien instances
	163
	164	(eval-when (:compile-toplevel :load-toplevel :execute)
	165	(defclass proxy ()
12d0437e	166	((location :reader proxy-location :type system-area-pointer)))
94f15c3c	167
	168	(defgeneric initialize-proxy (object &rest initargs))
	169	(defgeneric instance-finalizer (object)))
	170
	171
	172	(defmethod initialize-instance :after ((instance proxy)
	173	&rest initargs &key)
	174	(declare (ignore initargs))
	175	(cache-instance instance)
	176	(ext:finalize instance (instance-finalizer instance)))
	177
94f15c3c	178	(defmethod initialize-proxy ((instance proxy)
12d0437e	179	&rest initargs &key location weak-ref)
94f15c3c	180	(declare (ignore initargs))
12d0437e	181	(setf
	182	(slot-value instance 'location)
	183	(if weak-ref
	184	(funcall
	185	(proxy-class-copy (class-of instance))
	186	(type-of instance) location)
	187	location))
	188	(cache-instance instance)
	189	(ext:finalize instance (instance-finalizer instance)))
94f15c3c	190
94f15c3c	191	(defmethod instance-finalizer ((instance proxy))
4d83a8a6	192	(let ((class (class-of instance))
12d0437e	193	(type (type-of instance))
12d0437e	194	(location (proxy-location instance)))
4d83a8a6	195	(declare (type symbol type) (type system-area-pointer location))
	196	(let ((free (proxy-class-free class)))
	197	#'(lambda ()
	198	(funcall free type location)
	199	(remove-cached-instance location)))))
94f15c3c	200
	201
	202	(deftype-method translate-type-spec proxy (type-spec)
	203	(declare (ignore type-spec))
	204	(translate-type-spec 'pointer))
	205
	206	(deftype-method size-of proxy (type-spec)
	207	(declare (ignore type-spec))
	208	(size-of 'pointer))
	209
	210	(deftype-method translate-from-alien
	211	proxy (type-spec location &optional weak-ref)
	212	`(let ((location ,location))
	213	(unless (null-pointer-p location)
	214	(ensure-proxy-instance ',type-spec location ,weak-ref))))
	215
12d0437e	216	(deftype-method translate-to-alien
	217	proxy (type-spec instance &optional weak-ref)
	218	(if weak-ref
	219	`(proxy-location ,instance)
4d83a8a6	220	(let ((copy (proxy-class-copy (find-class type-spec))))
	221	(if (symbolp copy)
	222	`(,copy ',type-spec (proxy-location ,instance))
	223	`(funcall ',copy ',type-spec (proxy-location ,instance))))))
94f15c3c	224
12d0437e	225	(deftype-method unreference-alien proxy (type-spec location)
4d83a8a6	226	(let ((free (proxy-class-free (find-class type-spec))))
	227	(if (symbolp free)
	228	`(,free ',type-spec ,location)
	229	`(funcall ',free ',type-spec ,location))))
12d0437e	230
4d83a8a6	231	;; (defun proxy-instance-size (proxy)
4d83a8a6	232	;; (proxy-class-size (class-of proxy)))
94f15c3c	233
	234	;;;; Metaclass used for subclasses of proxy
	235
	236	(eval-when (:compile-toplevel :load-toplevel :execute)
12d0437e	237	(defclass proxy-class (virtual-slot-class)
	238	((size :reader proxy-class-size)
	239	(copy :reader proxy-class-copy)
	240	(free :reader proxy-class-free)))
94f15c3c	241
94f15c3c	242	(defclass direct-alien-slot-definition (direct-virtual-slot-definition)
12d0437e	243	((allocation :initform :alien)
12d0437e	244	(offset :reader slot-definition-offset :initarg :offset)))
94f15c3c	245
94f15c3c	246	(defclass effective-alien-slot-definition (effective-virtual-slot-definition)
4d83a8a6	247	((offset :reader slot-definition-offset :initarg :offset)))
94f15c3c	248
4d83a8a6	249	(defclass effective-virtual-alien-slot-definition (effective-virtual-slot-definition)
4d83a8a6	250	())
12d0437e	251
94f15c3c	252
	253	(defmethod most-specific-proxy-superclass ((class proxy-class))
	254	(find-if
	255	#'(lambda (class)
	256	(subtypep (class-name class) 'proxy))
4d83a8a6	257	(cdr (compute-class-precedence-list class))))
4d83a8a6	258
12d0437e	259	(defmethod direct-proxy-superclass ((class proxy-class))
	260	(find-if
	261	#'(lambda (class)
	262	(subtypep (class-name class) 'proxy))
4d83a8a6	263	(class-direct-superclasses class)))
4d83a8a6	264
94f15c3c	265	(defmethod shared-initialize ((class proxy-class) names
12d0437e	266	&rest initargs &key size copy free)
94f15c3c	267	(declare (ignore initargs))
94f15c3c	268	(call-next-method)
12d0437e	269	(cond
4d83a8a6	270	(size (setf (slot-value class 'size) (first size)))
4d83a8a6	271	((slot-boundp class 'size) (slot-makunbound class 'size)))
12d0437e	272	(cond
4d83a8a6	273	(copy (setf (slot-value class 'copy) (first copy)))
4d83a8a6	274	((slot-boundp class 'copy) (slot-makunbound class 'copy)))
12d0437e	275	(cond
4d83a8a6	276	(free (setf (slot-value class 'free) (first free)))
	277	((slot-boundp class 'free) (slot-makunbound class 'free))))
	278
	279	;; (defmethod finalize-inheritance ((class proxy-class))
	280	;; (call-next-method)
	281	(defmethod shared-initialize :after ((class proxy-class) names &rest initargs)
3e15002d	282	(let ((super (most-specific-proxy-superclass class)))
3e15002d	283	(unless (or (not super) (eq super (find-class 'proxy)))
4d83a8a6	284	(unless (or (slot-boundp class 'copy) (not (slot-boundp super 'copy)))
	285	(setf (slot-value class 'copy) (proxy-class-copy super)))
	286	(unless (or (slot-boundp class 'free) (not (slot-boundp super 'free)))
	287	(setf (slot-value class 'free) (proxy-class-free super))))))
	288
	289	(defmethod direct-slot-definition-class ((class proxy-class) &rest initargs)
94f15c3c	290	(case (getf initargs :allocation)
94f15c3c	291	((nil :alien) (find-class 'direct-alien-slot-definition))
94f15c3c	292	(t (call-next-method))))
4d83a8a6	293
4d83a8a6	294	(defmethod effective-slot-definition-class ((class proxy-class) &rest initargs)
94f15c3c	295	(case (getf initargs :allocation)
	296	(:alien (find-class 'effective-alien-slot-definition))
	297	(:virtual (find-class 'effective-virtual-alien-slot-definition))
	298	(t (call-next-method))))
	299
4d83a8a6	300
	301	(defmethod compute-effective-slot-definition-initargs ((class proxy-class) direct-slotds)
	302	(if (eq (most-specific-slot-value direct-slotds 'allocation) :alien)
	303	(nconc
	304	(list :offset (most-specific-slot-value direct-slotds 'offset))
	305	(call-next-method))
	306	(call-next-method)))
	307
	308
	309	(defmethod initialize-internal-slot-functions ((slotd effective-alien-slot-definition))
	310	(with-slots (offset) slotd
	311	(let* ((type (slot-definition-type slotd))
	312	(reader (intern-reader-function type))
	313	(writer (intern-writer-function type))
	314	(destroy (intern-destroy-function type)))
	315	(unless (slot-boundp slotd 'reader-function)
	316	(setf
	317	(slot-value slotd 'reader-function)
	318	#'(lambda (object)
	319	(funcall reader (proxy-location object) offset))))
	320
	321	(unless (slot-boundp slotd 'writer-function)
	322	(setf
	323	(slot-value slotd 'writer-function)
	324	#'(lambda (value object)
	325	(let ((location (proxy-location object)))
	326	(funcall destroy location offset)
	327	(funcall writer value location offset)))))
	328
	329	(unless (slot-boundp slotd 'boundp-function)
	330	(setf
	331	(slot-value slotd 'boundp-function)
	332	#'(lambda (object)
	333	(declare (ignore object))
	334	t)))))
	335	(call-next-method))
	336
	337
	338	(defmethod initialize-internal-slot-functions ((slotd effective-virtual-alien-slot-definition))
	339	(with-slots (getter setter type) slotd
	340	(when (and (not (slot-boundp slotd 'reader-function)) (stringp getter))
	341	(let ((reader (mkbinding-late getter type 'pointer)))
	342	(setf (slot-value slotd 'reader-function)
	343	#'(lambda (object)
	344	(funcall reader (proxy-location object))))))
	345
	346	(when (and (not (slot-boundp slotd 'writer-function)) (stringp setter))
	347	(let ((writer (mkbinding-late setter 'nil 'pointer type)))
	348	(setf (slot-value slotd 'writer-function)
	349	#'(lambda (value object)
	350	(funcall writer (proxy-location object) value))))))
	351	(call-next-method))
	352
	353	;; TODO: call some C code to detect this a compile time
	354	(defconstant +struct-alignmen+ 4)
94f15c3c	355
94f15c3c	356	(defmethod compute-slots ((class proxy-class))
4d83a8a6	357	;; This stuff should really go somewhere else
	358	(loop
	359	with offset = (proxy-class-size (most-specific-proxy-superclass class))
	360	with size = offset
	361	for slotd in (class-direct-slots class)
	362	when (eq (slot-definition-allocation slotd) :alien)
	363	do (if (not (slot-boundp slotd 'offset))
	364	(setf (slot-value slotd 'offset) offset)
	365	(setq offset (slot-value slotd 'offset)))
	366
	367	(incf offset (size-of (slot-definition-type slotd)))
	368	(incf offset (mod offset +struct-alignmen+))
	369	(setq size (max size offset))
	370
	371	finally (unless (slot-boundp class 'size)
	372	(setf (slot-value class 'size) size)))
94f15c3c	373	(call-next-method))
3e15002d	374
4d83a8a6	375
	376	(defmethod validate-superclass ((class proxy-class) (super standard-class))
	377	(subtypep (class-name super) 'proxy))
	378
12d0437e	379	(defmethod proxy-class-size (class)
	380	(declare (ignore class))
	381	0)
4d83a8a6	382	)
	383
	384	(defgeneric make-proxy-instance (class location weak-ref
	385	&rest initargs &key));)
94f15c3c	386
	387	(defmethod make-proxy-instance ((class symbol) location weak-ref
	388	&rest initargs &key)
	389	(apply #'make-proxy-instance (find-class class) location weak-ref initargs))
	390
	391	(defmethod make-proxy-instance ((class proxy-class) location weak-ref
	392	&rest initargs &key)
	393	(let ((instance (allocate-instance class)))
	394	(apply
	395	#'initialize-proxy
	396	instance :location location :weak-ref weak-ref initargs)
	397	instance))
	398
	399	(defun ensure-proxy-instance (class location weak-ref &rest initargs)
	400	(or
	401	(find-cached-instance location)
	402	(apply #'make-proxy-instance class location weak-ref initargs)))
	403
	404
12d0437e	405
12d0437e	406	;;;; Superclasses for wrapping of C structures
94f15c3c	407
94f15c3c	408	(eval-when (:compile-toplevel :load-toplevel :execute)
12d0437e	409	(defclass struct (proxy)
94f15c3c	410	()
94f15c3c	411	(:metaclass proxy-class)
12d0437e	412	(:copy %copy-struct)
12d0437e	413	(:free %free-struct)))
94f15c3c	414
4d83a8a6	415	(defmethod initialize-instance ((structure struct) &rest initargs)
94f15c3c	416	(declare (ignore initargs))
	417	(setf
	418	(slot-value structure 'location)
12d0437e	419	(allocate-memory (proxy-class-size (class-of structure))))
94f15c3c	420	(call-next-method))
	421
	422
12d0437e	423	(defun %copy-struct (type location)
12d0437e	424	(copy-memory location (proxy-class-size (find-class type))))
94f15c3c	425
12d0437e	426	(defun %free-struct (type location)
	427	(declare (ignore type))
	428	(deallocate-memory location))
94f15c3c	429
94f15c3c	430
3e15002d	431	;(eval-when (:compile-toplevel :load-toplevel :execute)
12d0437e	432	(defclass static (struct)
12d0437e	433	()
3e15002d	434	(:metaclass proxy-class)
	435	(:copy %copy-static)
	436	(:free %free-static));)
94f15c3c	437
12d0437e	438	(defun %copy-static (type location)
	439	(declare (ignore type))
	440	location)
94f15c3c	441
12d0437e	442	(defun %free-static (type location)
	443	(declare (ignore type location))
	444	nil)