[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 1.11 2004/11/06 21:39:58 espen Exp $

(in-package "GLIB")

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

(eval-when (:compile-toplevel :load-toplevel :execute)
  (defclass virtual-slots-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-slots-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-slots-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 getter 
;; 				(slot-definition-type slotd) 'pointer)))
		   (setf (slot-value slotd 'reader-function)
			 #'(lambda (object)
			     (let ((reader
				(mkbinding getter 
				 (slot-definition-type slotd) 'pointer)))
			     (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 setter 'nil 'pointer 
;; 			 (slot-definition-type slotd))))
	    (setf (slot-value slotd 'writer-function)
		  #'(lambda (value object)
		      (unless writer
			(setq writer
			 (mkbinding setter 'nil 'pointer 
 			  (slot-definition-type slotd))))
		      (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-slots-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-slots-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-slots-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-slots-class) (object standard-object)
     (slotd effective-virtual-slot-definition))
  (funcall (slot-value slotd 'writer-function) value object))

  
(defmethod validate-superclass
    ((class virtual-slots-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 instance-cached-p (location)
  (gethash (system:sap-int location) *instance-cache*))

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

;; For debuging
(defun cached-instances ()
  (let ((instances ()))
    (maphash #'(lambda (location ref)
		 (declare (ignore location))
		 (push (ext:weak-pointer-value ref) instances))
	     *instance-cache*)
    instances))
			

;;;; Proxy for alien instances

(defclass proxy ()
  ((location :reader proxy-location :type system-area-pointer)))

(defgeneric initialize-proxy (object &rest initargs))
(defgeneric instance-finalizer (object))
(defgeneric reference-foreign (class location))
(defgeneric unreference-foreign (class location))

(defmethod unreference-foreign :around ((class class) location)
  (unless (null-pointer-p location)
;;     (format t "Unreferencing ~A at ~A" (class-name class) location)
;;     (finish-output *standard-output*)
    (call-next-method)
;;     (write-line " done")
;;     (finish-output *standard-output*)
    ))

(defmethod print-object ((instance proxy) stream)
  (print-unreadable-object (instance stream :type t :identity nil)
    (format stream "at 0x~X" (sap-int (proxy-location instance)))))

(defmethod print-object ((instance proxy) stream)
  (print-unreadable-object (instance stream :type t :identity nil)
    (format stream "at 0x~X" (sap-int (proxy-location instance)))))


(defmethod initialize-instance :around ((instance proxy) &key location)
  (if location
      (setf (slot-value instance 'location) location)      
    (call-next-method))
  (cache-instance instance)
  (ext:finalize instance (instance-finalizer instance))
  instance)

(defmethod instance-finalizer ((instance proxy))
  (let ((location (proxy-location instance))
	(class (class-of instance)))    
;;     (unless (find-method #'unreference-foreign nil (list (class-of class) t) nil)
;;       (error "No matching method for UNREFERENCE-INSTANCE when called with class ~A" class))
    #'(lambda ()
	(when (instance-cached-p location)
	  (remove-cached-instance location))
	(unreference-foreign class location))))


;;;; Metaclass used for subclasses of proxy

(eval-when (:compile-toplevel :load-toplevel :execute)
  (defclass proxy-class (virtual-slots-class)
    ((size :reader proxy-instance-size)))

  (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)
    (declare (ignore initargs))
    (call-next-method)
    (cond
      (size (setf (slot-value class 'size) (first size)))
      ((slot-boundp class 'size) (slot-makunbound class 'size))))
  
  (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)))
	(unless (slot-boundp slotd 'reader-function)
	  (let ((reader (reader-function type)))
	    (setf 
	     (slot-value slotd 'reader-function)
	     #'(lambda (object)
		 (funcall reader (proxy-location object) offset)))))

	(unless (slot-boundp slotd 'writer-function)
	  (let ((writer (writer-function type))
		(destroy (destroy-function type)))
	    (setf 
	     (slot-value slotd 'writer-function)
	     #'(lambda (value object)
		 (let ((location (proxy-location object)))
		   (funcall destroy location offset) ; destroy old value
		   (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))
    (loop 
     with offset = (proxy-instance-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-instance-size (class)
    (declare (ignore class))
    0)
)
  
(defmethod alien-type ((class proxy-class) &rest args)
  (declare (ignore class args))
  (alien-type 'pointer))

(defmethod size-of ((class proxy-class) &rest args)
  (declare (ignore class args))
  (size-of 'pointer))

(defmethod from-alien-form (location (class proxy-class) &rest args)
  (declare (ignore args))
  `(ensure-proxy-instance ',(class-name class) ,location))

(defmethod from-alien-function ((class proxy-class) &rest args)
  (declare (ignore args))  
  #'(lambda (location)
      (ensure-proxy-instance class location)))

(defmethod to-alien-form (instance (class proxy-class) &rest args)
  (declare (ignore class args))
  `(proxy-location ,instance))

(defmethod to-alien-function ((class proxy-class) &rest args)
  (declare (ignore class args))
  #'proxy-location)

(defmethod writer-function ((class proxy-class) &rest args)
  (declare (ignore args))
  #'(lambda (instance location &optional (offset 0))
      (assert (null-pointer-p (sap-ref-sap location offset)))
      (setf 
       (sap-ref-sap location offset)
       (reference-foreign class (proxy-location instance)))))

(defmethod reader-function ((class proxy-class) &rest args)
  (declare (ignore args))
  #'(lambda (location &optional (offset 0))
      (ensure-proxy-instance class (sap-ref-sap location offset))))

(defmethod destroy-function ((class proxy-class) &rest args)
  (declare (ignore args))
  #'(lambda (location &optional (offset 0))
      (unreference-foreign class (sap-ref-sap location offset))))


(defgeneric ensure-proxy-instance (class location)
  (:documentation "Returns a proxy object representing the foreign object at the give location."))

(defmethod ensure-proxy-instance :around (class location)
  (unless (null-pointer-p location)
    (or 
     (find-cached-instance location)
     (call-next-method))))
  
(defmethod ensure-proxy-instance ((class symbol) location)
  (ensure-proxy-instance (find-class class) location))

(defmethod ensure-proxy-instance ((class proxy-class) location)
  (make-instance class :location location))


;;;; Superclasses for wrapping of C structures

(defclass struct (proxy)
  ()
  (:metaclass proxy-class))

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


;;;; Metaclasses used for subclasses of struct

(defclass struct-class (proxy-class)
  ())

(defmethod reference-foreign ((class struct-class) location)
  (copy-memory location (proxy-instance-size class)))

(defmethod unreference-foreign ((class struct-class) location)
  (deallocate-memory location))

(defmethod reader-function ((class struct-class) &rest args)
  (declare (ignore args))
  #'(lambda (location &optional (offset 0))
      (let ((instance (sap-ref-sap location offset)))
	(unless (null-pointer-p instance)
	  (ensure-proxy-instance class (reference-foreign class instance))))))


(defclass static-struct-class (struct-class)
  ())

(defmethod reference-foreign ((class static-struct-class) location)
  (declare (ignore class))
  location)

(defmethod unreference-foreign ((class static-struct-class) location)
  (declare (ignore class location))
  nil)
Commit	Line	Data
b44caf77	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
6baf860c	18	;; $Id: proxy.lisp,v 1.11 2004/11/06 21:39:58 espen Exp $
b44caf77	19
	20	(in-package "GLIB")
	21
b44caf77	22	;;;; Superclass for all metaclasses implementing some sort of virtual slots
	23
	24	(eval-when (:compile-toplevel :load-toplevel :execute)
6baf860c	25	(defclass virtual-slots-class (standard-class)
935a783c	26	())
b44caf77	27
b44caf77	28	(defclass direct-virtual-slot-definition (standard-direct-slot-definition)
ba25fa44	29	((setter :reader slot-definition-setter :initarg :setter)
935a783c	30	(getter :reader slot-definition-getter :initarg :getter)
935a783c	31	(boundp :reader slot-definition-boundp :initarg :boundp)))
b44caf77	32
935a783c	33	(defclass effective-virtual-slot-definition (standard-effective-slot-definition)
	34	((setter :reader slot-definition-setter :initarg :setter)
	35	(getter :reader slot-definition-getter :initarg :getter)
	36	(boundp :reader slot-definition-boundp :initarg :boundp)))
	37
	38	(defun most-specific-slot-value (instances slot &optional default)
	39	(let ((object (find-if
	40	#'(lambda (ob)
	41	(and (slot-exists-p ob slot) (slot-boundp ob slot)))
	42	instances)))
	43	(if object
	44	(slot-value object slot)
6baf860c	45	default))))
935a783c	46
b44caf77	47
b44caf77	48
6baf860c	49	(defmethod direct-slot-definition-class ((class virtual-slots-class) &rest initargs)
b44caf77	50	(if (eq (getf initargs :allocation) :virtual)
	51	(find-class 'direct-virtual-slot-definition)
	52	(call-next-method)))
	53
6baf860c	54	(defmethod effective-slot-definition-class ((class virtual-slots-class) &rest initargs)
b44caf77	55	(if (eq (getf initargs :allocation) :virtual)
	56	(find-class 'effective-virtual-slot-definition)
	57	(call-next-method)))
	58
935a783c	59
	60	(defmethod initialize-internal-slot-functions ((slotd effective-virtual-slot-definition))
	61	(with-slots (getter setter boundp) slotd
	62	(unless (slot-boundp slotd 'reader-function)
	63	(setf
	64	(slot-value slotd 'reader-function)
	65	(etypecase getter
	66	(function getter)
	67	(null #'(lambda (object)
	68	(declare (ignore object))
	69	(error "Can't read slot: ~A" (slot-definition-name slotd))))
	70	(symbol #'(lambda (object)
0466f75e	71	(funcall getter object)))
6baf860c	72	(string ;(let ()(reader (mkbinding getter
6baf860c	73	;; (slot-definition-type slotd) 'pointer)))
0466f75e	74	(setf (slot-value slotd 'reader-function)
0466f75e	75	#'(lambda (object)
6baf860c	76	(let ((reader
	77	(mkbinding getter
	78	(slot-definition-type slotd) 'pointer)))
0466f75e	79	(funcall reader (proxy-location object)))))))))
935a783c	80
	81	(unless (slot-boundp slotd 'writer-function)
	82	(setf
	83	(slot-value slotd 'writer-function)
	84	(etypecase setter
	85	(function setter)
	86	(null #'(lambda (object)
	87	(declare (ignore object))
	88	(error "Can't set slot: ~A" (slot-definition-name slotd))))
	89	((or symbol cons) #'(lambda (value object)
0466f75e	90	(funcall (fdefinition setter) value object)))
0466f75e	91	(string
6baf860c	92	(let ((writer ()));; (mkbinding setter 'nil 'pointer
6baf860c	93	;; (slot-definition-type slotd))))
0466f75e	94	(setf (slot-value slotd 'writer-function)
0466f75e	95	#'(lambda (value object)
6baf860c	96	(unless writer
	97	(setq writer
	98	(mkbinding setter 'nil 'pointer
	99	(slot-definition-type slotd))))
0466f75e	100	(funcall writer (proxy-location object) value))))))))
935a783c	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
6baf860c	120	(defmethod compute-effective-slot-definition-initargs ((class virtual-slots-class) direct-slotds)
935a783c	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
b44caf77	129
b44caf77	130	(defmethod slot-value-using-class
6baf860c	131	((class virtual-slots-class) (object standard-object)
b44caf77	132	(slotd effective-virtual-slot-definition))
935a783c	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))))
b44caf77	136
b44caf77	137	(defmethod slot-boundp-using-class
6baf860c	138	((class virtual-slots-class) (object standard-object)
b44caf77	139	(slotd effective-virtual-slot-definition))
935a783c	140	(funcall (slot-value slotd 'boundp-function) object))
	141
	142	(defmethod (setf slot-value-using-class)
6baf860c	143	(value (class virtual-slots-class) (object standard-object)
b44caf77	144	(slotd effective-virtual-slot-definition))
935a783c	145	(funcall (slot-value slotd 'writer-function) value object))
	146
	147
b44caf77	148	(defmethod validate-superclass
6baf860c	149	((class virtual-slots-class) (super standard-class))
b44caf77	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
a5c3a597	168	(defun instance-cached-p (location)
	169	(gethash (system:sap-int location) instance-cache))
	170
b44caf77	171	(defun remove-cached-instance (location)
	172	(remhash (system:sap-int location) instance-cache))
	173
6baf860c	174	;; For debuging
	175	(defun cached-instances ()
	176	(let ((instances ()))
	177	(maphash #'(lambda (location ref)
	178	(declare (ignore location))
	179	(push (ext:weak-pointer-value ref) instances))
	180	instance-cache)
	181	instances))
	182
b44caf77	183
	184
	185	;;;; Proxy for alien instances
	186
6baf860c	187	(defclass proxy ()
6baf860c	188	((location :reader proxy-location :type system-area-pointer)))
b44caf77	189
6baf860c	190	(defgeneric initialize-proxy (object &rest initargs))
	191	(defgeneric instance-finalizer (object))
	192	(defgeneric reference-foreign (class location))
	193	(defgeneric unreference-foreign (class location))
	194
	195	(defmethod unreference-foreign :around ((class class) location)
	196	(unless (null-pointer-p location)
	197	;; (format t "Unreferencing ~A at ~A" (class-name class) location)
	198	;; (finish-output standard-output)
	199	(call-next-method)
	200	;; (write-line " done")
	201	;; (finish-output standard-output)
	202	))
b44caf77	203
a5c3a597	204	(defmethod print-object ((instance proxy) stream)
	205	(print-unreadable-object (instance stream :type t :identity nil)
	206	(format stream "at 0x~X" (sap-int (proxy-location instance)))))
	207
6baf860c	208	(defmethod print-object ((instance proxy) stream)
	209	(print-unreadable-object (instance stream :type t :identity nil)
	210	(format stream "at 0x~X" (sap-int (proxy-location instance)))))
b44caf77	211
b44caf77	212
6baf860c	213	(defmethod initialize-instance :around ((instance proxy) &key location)
	214	(if location
	215	(setf (slot-value instance 'location) location)
	216	(call-next-method))
ba25fa44	217	(cache-instance instance)
6baf860c	218	(ext:finalize instance (instance-finalizer instance))
6baf860c	219	instance)
b44caf77	220
b44caf77	221	(defmethod instance-finalizer ((instance proxy))
6baf860c	222	(let ((location (proxy-location instance))
	223	(class (class-of instance)))
	224	;; (unless (find-method #'unreference-foreign nil (list (class-of class) t) nil)
	225	;; (error "No matching method for UNREFERENCE-INSTANCE when called with class ~A" class))
	226	#'(lambda ()
	227	(when (instance-cached-p location)
	228	(remove-cached-instance location))
	229	(unreference-foreign class location))))
ba25fa44	230
b44caf77	231
	232	;;;; Metaclass used for subclasses of proxy
	233
	234	(eval-when (:compile-toplevel :load-toplevel :execute)
6baf860c	235	(defclass proxy-class (virtual-slots-class)
6baf860c	236	((size :reader proxy-instance-size)))
b44caf77	237
b44caf77	238	(defclass direct-alien-slot-definition (direct-virtual-slot-definition)
ba25fa44	239	((allocation :initform :alien)
ba25fa44	240	(offset :reader slot-definition-offset :initarg :offset)))
b44caf77	241
b44caf77	242	(defclass effective-alien-slot-definition (effective-virtual-slot-definition)
935a783c	243	((offset :reader slot-definition-offset :initarg :offset)))
ba25fa44	244
b44caf77	245
	246	(defmethod most-specific-proxy-superclass ((class proxy-class))
	247	(find-if
	248	#'(lambda (class)
	249	(subtypep (class-name class) 'proxy))
935a783c	250	(cdr (compute-class-precedence-list class))))
935a783c	251
ba25fa44	252	(defmethod direct-proxy-superclass ((class proxy-class))
	253	(find-if
	254	#'(lambda (class)
	255	(subtypep (class-name class) 'proxy))
935a783c	256	(class-direct-superclasses class)))
935a783c	257
b44caf77	258	(defmethod shared-initialize ((class proxy-class) names
6baf860c	259	&rest initargs &key size)
b44caf77	260	(declare (ignore initargs))
b44caf77	261	(call-next-method)
ba25fa44	262	(cond
935a783c	263	(size (setf (slot-value class 'size) (first size)))
6baf860c	264	((slot-boundp class 'size) (slot-makunbound class 'size))))
935a783c	265
935a783c	266	(defmethod direct-slot-definition-class ((class proxy-class) &rest initargs)
b44caf77	267	(case (getf initargs :allocation)
b44caf77	268	((nil :alien) (find-class 'direct-alien-slot-definition))
b44caf77	269	(t (call-next-method))))
935a783c	270
935a783c	271	(defmethod effective-slot-definition-class ((class proxy-class) &rest initargs)
b44caf77	272	(case (getf initargs :allocation)
b44caf77	273	(:alien (find-class 'effective-alien-slot-definition))
b44caf77	274	(t (call-next-method))))
b44caf77	275
935a783c	276
	277	(defmethod compute-effective-slot-definition-initargs ((class proxy-class) direct-slotds)
	278	(if (eq (most-specific-slot-value direct-slotds 'allocation) :alien)
	279	(nconc
	280	(list :offset (most-specific-slot-value direct-slotds 'offset))
	281	(call-next-method))
	282	(call-next-method)))
	283
	284
	285	(defmethod initialize-internal-slot-functions ((slotd effective-alien-slot-definition))
	286	(with-slots (offset) slotd
6baf860c	287	(let ((type (slot-definition-type slotd)))
935a783c	288	(unless (slot-boundp slotd 'reader-function)
6baf860c	289	(let ((reader (reader-function type)))
	290	(setf
	291	(slot-value slotd 'reader-function)
	292	#'(lambda (object)
	293	(funcall reader (proxy-location object) offset)))))
935a783c	294
935a783c	295	(unless (slot-boundp slotd 'writer-function)
6baf860c	296	(let ((writer (writer-function type))
	297	(destroy (destroy-function type)))
	298	(setf
	299	(slot-value slotd 'writer-function)
	300	#'(lambda (value object)
	301	(let ((location (proxy-location object)))
	302	(funcall destroy location offset) ; destroy old value
	303	(funcall writer value location offset))))))
935a783c	304
	305	(unless (slot-boundp slotd 'boundp-function)
	306	(setf
	307	(slot-value slotd 'boundp-function)
	308	#'(lambda (object)
	309	(declare (ignore object))
	310	t)))))
	311	(call-next-method))
	312
	313
935a783c	314	;; TODO: call some C code to detect this a compile time
935a783c	315	(defconstant +struct-alignmen+ 4)
b44caf77	316
b44caf77	317	(defmethod compute-slots ((class proxy-class))
935a783c	318	(loop
6baf860c	319	with offset = (proxy-instance-size (most-specific-proxy-superclass class))
935a783c	320	with size = offset
	321	for slotd in (class-direct-slots class)
	322	when (eq (slot-definition-allocation slotd) :alien)
	323	do (if (not (slot-boundp slotd 'offset))
	324	(setf (slot-value slotd 'offset) offset)
	325	(setq offset (slot-value slotd 'offset)))
	326
	327	(incf offset (size-of (slot-definition-type slotd)))
	328	(incf offset (mod offset +struct-alignmen+))
	329	(setq size (max size offset))
	330
	331	finally (unless (slot-boundp class 'size)
	332	(setf (slot-value class 'size) size)))
b44caf77	333	(call-next-method))
8ae7ddc2	334
935a783c	335
	336	(defmethod validate-superclass ((class proxy-class) (super standard-class))
	337	(subtypep (class-name super) 'proxy))
	338
6baf860c	339	(defmethod proxy-instance-size (class)
ba25fa44	340	(declare (ignore class))
ba25fa44	341	0)
935a783c	342	)
935a783c	343
6baf860c	344	(defmethod alien-type ((class proxy-class) &rest args)
	345	(declare (ignore class args))
	346	(alien-type 'pointer))
	347
	348	(defmethod size-of ((class proxy-class) &rest args)
	349	(declare (ignore class args))
	350	(size-of 'pointer))
	351
	352	(defmethod from-alien-form (location (class proxy-class) &rest args)
	353	(declare (ignore args))
	354	`(ensure-proxy-instance ',(class-name class) ,location))
	355
	356	(defmethod from-alien-function ((class proxy-class) &rest args)
	357	(declare (ignore args))
	358	#'(lambda (location)
	359	(ensure-proxy-instance class location)))
b44caf77	360
6baf860c	361	(defmethod to-alien-form (instance (class proxy-class) &rest args)
	362	(declare (ignore class args))
	363	`(proxy-location ,instance))
b44caf77	364
6baf860c	365	(defmethod to-alien-function ((class proxy-class) &rest args)
	366	(declare (ignore class args))
	367	#'proxy-location)
	368
	369	(defmethod writer-function ((class proxy-class) &rest args)
	370	(declare (ignore args))
	371	#'(lambda (instance location &optional (offset 0))
	372	(assert (null-pointer-p (sap-ref-sap location offset)))
	373	(setf
	374	(sap-ref-sap location offset)
	375	(reference-foreign class (proxy-location instance)))))
b44caf77	376
6baf860c	377	(defmethod reader-function ((class proxy-class) &rest args)
	378	(declare (ignore args))
	379	#'(lambda (location &optional (offset 0))
	380	(ensure-proxy-instance class (sap-ref-sap location offset))))
b44caf77	381
6baf860c	382	(defmethod destroy-function ((class proxy-class) &rest args)
	383	(declare (ignore args))
	384	#'(lambda (location &optional (offset 0))
	385	(unreference-foreign class (sap-ref-sap location offset))))
	386
	387
	388	(defgeneric ensure-proxy-instance (class location)
	389	(:documentation "Returns a proxy object representing the foreign object at the give location."))
	390
	391	(defmethod ensure-proxy-instance :around (class location)
	392	(unless (null-pointer-p location)
	393	(or
	394	(find-cached-instance location)
	395	(call-next-method))))
	396
	397	(defmethod ensure-proxy-instance ((class symbol) location)
	398	(ensure-proxy-instance (find-class class) location))
	399
	400	(defmethod ensure-proxy-instance ((class proxy-class) location)
	401	(make-instance class :location location))
b44caf77	402
ba25fa44	403
ba25fa44	404	;;;; Superclasses for wrapping of C structures
b44caf77	405
6baf860c	406	(defclass struct (proxy)
	407	()
	408	(:metaclass proxy-class))
b44caf77	409
6baf860c	410	(defmethod initialize-instance ((struct struct) &rest initargs)
b44caf77	411	(declare (ignore initargs))
b44caf77	412	(setf
6baf860c	413	(slot-value struct 'location)
6baf860c	414	(allocate-memory (proxy-instance-size (class-of struct))))
b44caf77	415	(call-next-method))
	416
	417
6baf860c	418	;;;; Metaclasses used for subclasses of struct
	419
	420	(defclass struct-class (proxy-class)
	421	())
b44caf77	422
6baf860c	423	(defmethod reference-foreign ((class struct-class) location)
	424	(copy-memory location (proxy-instance-size class)))
	425
	426	(defmethod unreference-foreign ((class struct-class) location)
ba25fa44	427	(deallocate-memory location))
b44caf77	428
6baf860c	429	(defmethod reader-function ((class struct-class) &rest args)
	430	(declare (ignore args))
	431	#'(lambda (location &optional (offset 0))
	432	(let ((instance (sap-ref-sap location offset)))
	433	(unless (null-pointer-p instance)
	434	(ensure-proxy-instance class (reference-foreign class instance))))))
	435
b44caf77	436
6baf860c	437	(defclass static-struct-class (struct-class)
6baf860c	438	())
b44caf77	439
6baf860c	440	(defmethod reference-foreign ((class static-struct-class) location)
6baf860c	441	(declare (ignore class))
ba25fa44	442	location)
b44caf77	443
6baf860c	444	(defmethod unreference-foreign ((class static-struct-class) location)
6baf860c	445	(declare (ignore class location))
ba25fa44	446	nil)