/[cffi-objects]/struct.lisp
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revision 3 by rklochkov, Fri May 4 11:25:20 2012 UTC revision 16 by rklochkov, Sat Dec 29 14:39:56 2012 UTC
# Line 16  Struct may be used in OBJECT cffi-type o Line 16  Struct may be used in OBJECT cffi-type o
16    
17  (defgeneric new-struct (class)  (defgeneric new-struct (class)
18    (:method (class)    (:method (class)
19      (foreign-alloc class)))      (foreign-alloc class)))
20    
21  (defgeneric free-struct (class value)  (defgeneric free-struct (class value)
22    (:method (class value)    (:method (class value)
23      (declare (ignore class))      (declare (ignore class))
24     ;   (break)
25        ;(format t "Free ~a ~a~%" class value)
26      (foreign-free value)))      (foreign-free value)))
27    
28  (defmethod gconstructor ((struct struct) &key new-struct &allow-other-keys)  (if (find-symbol "MEM-APTR" "CFFI") ;; new cffi
29    (if new-struct      (defun struct-type (type)
30        (new-struct (class-name (class-of struct)))        (list :struct type))
31        (progn      (defun struct-type (type)
32          (setf (slot-value struct 'value) nil)        type))
33          (null-pointer))))  
34    (defmethod gconstructor ((struct struct) &rest initargs
35                             &key new-struct &allow-other-keys)
36      (let ((class-name (class-name (class-of struct)))
37            (pointer (null-pointer)))
38        (if new-struct
39            (setf pointer (new-struct class-name))
40            (progn
41              (setf (slot-value struct 'value) nil
42                    (slot-value struct 'free-after) nil)))
43        (mapc
44         (lambda (field)
45           (let ((val (getf initargs (alexandria:make-keyword field))))
46             (if new-struct
47                 (setf (foreign-slot-value pointer
48                                           (struct-type class-name) field) val)
49                 (setf (getf (slot-value struct 'value) field) val))))
50         (foreign-slot-names (struct-type class-name)))
51        pointer))
52    
53  (defun pair (maybe-pair)  (defun pair (maybe-pair)
54    (if (consp maybe-pair) maybe-pair (cons maybe-pair maybe-pair)))    (if (consp maybe-pair) maybe-pair (cons maybe-pair maybe-pair)))
# Line 48  or may be cons (class-name . struct-name Line 68  or may be cons (class-name . struct-name
68                  (if (slot-boundp ,class-name 'value)                  (if (slot-boundp ,class-name 'value)
69                      (getf (slot-value ,class-name 'value) ',x)                      (getf (slot-value ,class-name 'value) ',x)
70                      (foreign-slot-value (pointer ,class-name)                      (foreign-slot-value (pointer ,class-name)
71                                          ',struct-name ',x)))                                          ',(struct-type struct-name) ',x)))
72                (unless (fboundp '(setf ,x))                (unless (fboundp '(setf ,x))
73                  (defgeneric (setf ,x) (val ,class-name)))                  (defgeneric (setf ,x) (val ,class-name)))
74                (defmethod (setf ,x) (val (,class-name ,class-name))                (defmethod (setf ,x) (val (,class-name ,class-name))
75                  (if (slot-boundp ,class-name 'value)                  (if (slot-boundp ,class-name 'value)
76                      (setf (getf (slot-value ,class-name 'value) ',x) val)                      (setf (getf (slot-value ,class-name 'value) ',x) val)
77                      (setf (foreign-slot-value (pointer ,class-name)                      (setf (foreign-slot-value (pointer ,class-name)
78                                                ',struct-name ',x)                                                ',(struct-type struct-name) ',x)
79                            val)))                            val)))
80                (save-setter ,class-name ,x)))                (save-setter ,class-name ,x)))
81            (foreign-slot-names struct-name)))))            (foreign-slot-names (struct-type struct-name))))))
82    
83  (defmacro defbitaccessors (class slot &rest fields)  (defmacro defbitaccessors (class slot &rest fields)
84    (let ((pos 0))    (let ((pos 0))
# Line 88  or may be cons (class-name . struct-name Line 108  or may be cons (class-name . struct-name
108       (defcstruct-accessors ,class)       (defcstruct-accessors ,class)
109       (init-slots ,class)))       (init-slots ,class)))
110    
111    (defun clos->struct (class object struct)
112      (let ((default (gensym)))
113        (mapc (lambda (slot)
114                (let ((val (getf (slot-value object 'value) slot default)))
115                  (unless (eq val default)
116                    (setf (foreign-slot-value struct (struct-type class) slot)
117                          val))))
118              (foreign-slot-names (struct-type class)))))
119    
120  (defun clos->new-struct (class object)  (defun clos->new-struct (class object)
121    (if (slot-boundp object 'value)    (if (slot-boundp object 'value)
122        (let ((res (new-struct class))        ;; use make-instance, not new-struct, because gconstructor
123              (default (gensym)))        ;;                                            may be redefined
124          (mapc (lambda (slot)        (let ((res (make-instance class :new-struct t)))
125                  (let ((val (getf (slot-value object 'value) slot default)))          (clos->struct class object (pointer res))
126                    (unless (eq val default)          (pointer res))
127                      (setf (foreign-slot-value res class slot) val))))        (pointer object)))
               (foreign-slot-names class))  
         res)  
       (slot-value object 'pointer)))  
128    
129  (defun struct->clos (class struct &optional object)  (defun struct->clos (class struct &optional object)
130    (let ((res (or object (make-instance class))))    "Translates pointer STRUCT to object OBJECT (if not supplied, then to new
131      (setf (slot-value res 'value) nil)  object).
132      (mapc (lambda (slot)    I suppose, that by default it should convert data from pointer to struct.
133              (setf (getf (slot-value res 'value) slot)  Only exception is the presence of OBJECT with not boundp value"
134                    (foreign-slot-value struct class slot)))    (let ((%object (or object
135            (foreign-slot-names class))                       (unless (null-pointer-p struct)
136      res))                         (make-instance class)))))
137        (when %object
138          (if (slot-boundp %object 'value)
139              (progn
140                (setf (slot-value %object 'value) nil)
141                (unless (null-pointer-p struct)
142                  (dolist (slot (foreign-slot-names (struct-type class)))
143                    (setf (getf (slot-value %object 'value) slot)
144                          (foreign-slot-value struct (struct-type class) slot)))))
145              (setf (pointer %object) struct))
146          %object)))
147    
148  (define-foreign-type cffi-struct (cffi-object freeable-out)  (define-foreign-type cffi-struct (cffi-object freeable-out)
149    ()    ()
150    (:actual-type :pointer))    (:actual-type :pointer))
151    
152  (defmethod free-ptr ((type cffi-struct) ptr)  (defmethod free-sent-ptr ((type cffi-struct) ptr place)
153    (free-struct (object-class type) ptr))    (when (and (not (null-pointer-p ptr)) (slot-boundp place 'value))
154        (free-struct (object-class type) ptr)))
155    
156    (defmethod free-returned-ptr ((type cffi-struct) ptr)
157      (unless (null-pointer-p ptr)
158        (free-struct (object-class type) ptr)))
159    
160    
161  (defmethod foreign-type-size ((type cffi-struct))  (defmethod foreign-type-size ((type cffi-struct))
162    "Return the size in bytes of a foreign typedef."    "Return the size in bytes of a foreign typedef."
163    (foreign-type-size (object-class type)))    (foreign-type-size (struct-type (object-class type))))
164    
165  (define-parse-method struct (class &key (free :no-transfer) out)  (define-parse-method struct (class &rest rest)
166    (make-instance 'cffi-struct    (apply #'make-instance 'cffi-struct :class class rest))
                  :class class :free free :out out))  
167    
168  (defun %class (type value)  (defun %class (type value)
169    (or (object-class type) (class-name (class-of value))))    (or (object-class type) (class-name (class-of value))))
170    
171  (defmethod copy-from-foreign ((type cffi-object) ptr place)  (defmethod copy-from-foreign ((type cffi-object) ptr place)
172    (when (or (slot-boundp place 'value)    (when (slot-boundp place 'value)
             (member (object-free type) '(:all :transfer)))  
173      (struct->clos (%class type place) ptr place)))      (struct->clos (%class type place) ptr place)))
174    
175    ;; cffi-object is not tyoo. It is for use struct with object designator
176  (defmethod translate-to-foreign ((value struct) (type cffi-object))  (defmethod translate-to-foreign ((value struct) (type cffi-object))
177    (values (clos->new-struct (%class type value) value) value))    (values (clos->new-struct (%class type value) value) value))
178    
# Line 146  or may be cons (class-name . struct-name Line 184  or may be cons (class-name . struct-name
184    
185    
186  ;; to allow using array of structs  ;; to allow using array of structs
187  (eval-when (:compile-toplevel :load-toplevel :execute)  ;; (eval-when (:compile-toplevel :load-toplevel :execute)
188     (unless (get 'mem-ref 'struct)  ;;    (unless (get 'mem-ref 'struct)
189       (let ((old (fdefinition 'mem-ref)))  ;;      (let ((old (fdefinition 'mem-ref)))
190         (fmakunbound 'mem-ref)  ;;        (fmakunbound 'mem-ref)
191         (defun mem-ref (ptr type &optional (offset 0))  ;;        (defun mem-ref (ptr type &optional (offset 0))
192           (let ((ptype (cffi::parse-type type)))  ;;          (let ((ptype (cffi::parse-type type)))
193             (if (subtypep (type-of ptype) 'cffi-struct)  ;;            (if (subtypep (type-of ptype) 'cffi-struct)
194                 (translate-from-foreign (inc-pointer ptr offset) ptype)  ;;                (translate-from-foreign (inc-pointer ptr offset) ptype)
195                 (funcall old ptr type offset)))))  ;;                (funcall old ptr type offset)))))
196       (setf (get 'mem-ref 'struct) t)))  ;;      (setf (get 'mem-ref 'struct) t)))
197    
198    (defun struct-p (type)
199      (and (consp type) (eq (car type) 'struct)))
200    
201    (defun ptr-struct (ptr type i)
202      (inc-pointer ptr (* i (foreign-type-size type))))
203    
204  (defun from-foreign (var type count)  (defun from-foreign (var type count)
205    "VAR - symbol; type - symbol or list -- CFFI type; count -- integer"    "VAR - symbol; type - symbol or list -- CFFI type; count -- integer"
206    (if count    (if count
207        (let ((res (make-array count)))        (let ((res (make-array count)))
208          (dotimes (i count)          (if (struct-p type)
209            (setf (aref res i)              (dotimes (i count)
210                  (mem-aref var type i)))                (setf (aref res i)
211                        (convert-from-foreign (ptr-struct var type i) type)))
212                (dotimes (i count)
213                  (setf (aref res i)
214                        (mem-aref var type i))))
215          res)          res)
216        (mem-ref var type)))        (mem-ref var type)))
217    

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