(&whole it (c-name lisp-name) return-type &rest args)
(declare (ignorable c-name lisp-name return-type args))
`(define-alien-routine ,@(cdr it)))
-#||
-(define-c-accessor FOO-PORT SOCKADDR-IN (ARRAY (UNSIGNED 8) 2) 2 2)
-(define-c-accessor SOCKADDR-IN-FAMILY SOCKADDR-IN INTEGER 6 2)
-||#
-;;; define-c-accessor makes us a setter and a getter for changing
-;;; memory at the appropriate offset
-
-;;; (define-c-accessor STAT-ATIME STAT (INTEGER 32) 56 4)
-
-
-(defmacro define-c-accessor (el structure type offset length)
- (declare (ignore structure))
- (let* ((ty (cond
- ((eql type 'integer) `(,type ,(* 8 length)))
- ((eql (car type) '*) `(unsigned ,(* 8 length)))
- ((eql type 'c-string) `(unsigned ,(* 8 length)))
- ((eql (car type) 'array) (cadr type))))
- (sap-ref-? (intern (format nil "~ASAP-REF-~A"
- (if (member (car ty) '(INTEGER SIGNED))
- "SIGNED-" "")
- (cadr ty))
- (find-package "SB-SYS"))))
- (labels ((template (before after)
- `(let* ((addr (+ 8 (logandc1 7 (sb-kernel:get-lisp-obj-address ptr))))
- (sap (sb-sys:int-sap (the (unsigned-byte 32) (+ addr ,offset)))))
- (,before (,sap-ref-? sap index) ,after))))
- `(progn
- ;;(declaim (inline ,el (setf ,el)))
- (defun ,el (ptr &optional (index 0))
- (declare (optimize (speed 3)))
- (sb-sys:without-gcing
- ,(template 'prog1 nil)))
- (defconstant ,(intern (format nil "OFFSET-OF-~A" el)) ,offset)
- (defun (setf ,el) (newval ptr &optional (index 0))
- (declare (optimize (speed 3)))
- (sb-sys:without-gcing
- ,(template 'setf 'newval)))))))
-
-
-;;; make memory allocator for appropriately-sized block of memory, and
-;;; a constant to tell us how big it was anyway
-(defmacro define-c-struct (name size)
- (labels ((p (x) (intern (concatenate 'string x (symbol-name name))
- (symbol-package name))))
+
+
+
+;;; strctures
+
+#| C structs need: the with-... interface.
+|#
+
+;;; global XXXs:
+#|
+ XXX: :distrust-length t fields are dangerous. they should only be at
+ the end of the structure (they mess up offset/size calculations)
+|#
+
+(defun reintern (symbol &optional (package *package*))
+ (if (symbolp symbol)
+ (intern (symbol-name symbol) package)
+ symbol))
+
+(defparameter alien-type-table (make-hash-table :test 'eql))
+(defparameter lisp-type-table (make-hash-table :test 'eql))
+
+(macrolet ((define-alien-types ((type size) &rest defns)
+ `(progn
+ ,@(loop for defn in defns
+ collect (destructuring-bind (expected-type c-type lisp-type) defn
+ `(progn
+ (setf (gethash ',expected-type alien-type-table)
+ (lambda (,type ,size)
+ (declare (ignorable type size))
+ ,c-type))
+ (setf (gethash ',expected-type lisp-type-table)
+ (lambda (,type ,size)
+ (declare (ignorable type size))
+ ,lisp-type))))))))
+ (define-alien-types (type size)
+ (integer (or (gethash size (symbol-value (intern "*INTEGER-SIZES*")))
+ `(integer ,(* 8 size)))
+ `(unsigned-byte ,(* 8 size)))
+ (unsigned `(unsigned ,(* 8 size))
+ `(unsigned-byte ,(* 8 size)))
+ (signed `(signed ,(* 8 size))
+ `(signed-byte ,(* 8 size)))
+ (c-string `(array char ,size) 'cl:simple-string)
+ (c-string-pointer 'c-string 'cl:simple-string)
+ ;; TODO: multi-dimensional arrays, if they are ever needed.
+ (array (destructuring-bind (array-tag elt-type &optional array-size) type
+ (declare (ignore array-tag))
+ ;; XXX: use of EVAL. alien-size is a macro,
+ ;; unfortunately; and it will only accept unquoted type
+ ;; forms.
+ `(sb-alien:array ,elt-type ,(or array-size
+ (/ size (eval `(sb-alien:alien-size ,elt-type :bytes))))))
+ t)))
+
+(defun retrieve-type-for (type size table)
+ (multiple-value-bind (type-fn found)
+ (gethash (reintern (typecase type
+ (list (first type))
+ (t type))
+ (find-package '#:sb-grovel))
+ table)
+ (values
+ (if found
+ (funcall (the function type-fn) type size)
+ type)
+ found)))
+
+(defun alien-type-for (type size)
+ (reintern (retrieve-type-for type size alien-type-table)))
+
+(defun lisp-type-for (type size)
+ (multiple-value-bind (val found)
+ (retrieve-type-for type size lisp-type-table)
+ (if found
+ val
+ t)))
+
+
+(defun mk-padding (len offset)
+ (make-instance 'padding
+ :type `(array char ,len)
+ :offset offset
+ :size len
+ :name (gentemp "PADDING")))
+(defun mk-struct (offset &rest children)
+ (make-instance 'struct :name (gentemp "STRUCT")
+ :children (remove nil children)
+ :offset offset))
+(defun mk-union (offset &rest children)
+ (make-instance 'union :name (gentemp "UNION")
+ :children (remove nil children)
+ :offset offset))
+(defun mk-val (name type h-type offset size)
+ (declare (ignore h-type))
+ (make-instance 'value-slot :name name
+ :size size
+ :offset offset
+ :type type))
+
+;;; struct tree classes
+
+(defclass slot ()
+ ((offset :initarg :offset :reader offset)
+ (name :initarg :name :reader name)))
+
+(defclass structured-type (slot)
+ ((children :initarg :children :accessor children)))
+
+(defclass union (structured-type)
+ ())
+
+(defclass struct (structured-type)
+ ())
+
+(defclass value-slot (slot)
+ ((size :initarg :size :reader size)
+ (type :initarg :type :reader type)))
+
+(defclass padding (value-slot)
+ ())
+
+(defmethod print-object ((o value-slot) s)
+ (print-unreadable-object (o s :type t)
+ (format s "~S ~A+~A=~A" (name o) (offset o) (size o) (slot-end o))))
+
+(defmethod print-object ((o structured-type) s)
+ (print-unreadable-object (o s :type t)
+ (format s "~S ~A" (name o) (children o))))
+
+(defmethod size ((slot structured-type))
+ (let ((min-offset (offset slot)))
+ (if (null (children slot))
+ 0
+ (reduce #'max (mapcar (lambda (child)
+ (+ (- (offset child) min-offset) (size child)))
+ (children slot))
+ :initial-value 0))))
+
+(defgeneric slot-end (slot))
+(defmethod slot-end ((slot slot))
+ (+ (offset slot) (size slot)))
+
+(defun overlap-p (elt1 elt2)
+ (unless (or (zerop (size elt1))
+ (zerop (size elt2)))
+ (or
+ (and (<= (offset elt1)
+ (offset elt2))
+ (< (offset elt2)
+ (slot-end elt1)))
+ (and (<= (offset elt2)
+ (offset elt1))
+ (< (offset elt1)
+ (slot-end elt2))))))
+
+(defgeneric find-overlaps (root new-element))
+(defmethod find-overlaps ((root structured-type) new-element)
+ (when (overlap-p root new-element)
+ (let ((overlapping-elts (loop for child in (children root)
+ for overlap = (find-overlaps child new-element)
+ when overlap
+ return overlap)))
+ (cons root overlapping-elts))))
+
+(defmethod find-overlaps ((root value-slot) new-element)
+ (when (overlap-p root new-element)
+ (list root)))
+
+(defgeneric pad-to-offset-of (to-pad parent))
+ (macrolet ((skel (end-form)
+ `(let* ((end ,end-form)
+ (len (abs (- (offset to-pad) end))))
+ (cond
+ ((= end (offset to-pad)) ; we are at the right offset.
+ nil)
+ (t ; we have to pad between the
+ ; old slot's end and the new
+ ; slot's offset
+ (mk-padding len end))))))
+
+ (defmethod pad-to-offset-of (to-pad (parent struct))
+ (skel (if (null (children parent))
+ 0
+ (+ (size parent) (offset parent)))))
+ (defmethod pad-to-offset-of (to-pad (parent union))
+ (skel (if (null (children parent))
+ (offset to-pad)
+ (offset parent)))))
+
+(defgeneric replace-by-union (in-st element new-element))
+(defmethod replace-by-union ((in-st struct) elt new-elt)
+ (setf (children in-st) (remove elt (children in-st)))
+ (let ((padding (pad-to-offset-of new-elt in-st)))
+ (setf (children in-st)
+ (nconc (children in-st)
+ (list (mk-union (offset elt)
+ elt
+ (if padding
+ (mk-struct (offset elt)
+ padding
+ new-elt)
+ new-elt)))))))
+
+(defmethod replace-by-union ((in-st union) elt new-elt)
+ (let ((padding (pad-to-offset-of new-elt in-st)))
+ (setf (children in-st)
+ (nconc (children in-st)
+ (list (if padding
+ (mk-struct (offset in-st)
+ padding
+ new-elt)
+ new-elt))))))
+
+(defgeneric insert-element (root new-elt))
+(defmethod insert-element ((root struct) (new-elt slot))
+ (let ((overlaps (find-overlaps root new-elt)))
+ (cond
+ (overlaps (let ((last-structure (first (last overlaps 2)))
+ (last-val (first (last overlaps))))
+ (replace-by-union last-structure last-val new-elt)
+ root))
+ (t
+ (let ((padding (pad-to-offset-of new-elt root)))
+ (setf (children root)
+ (nconc (children root)
+ (when padding (list padding))
+ (list new-elt)))))))
+ root)
+
+(defun sane-slot (alien-var &rest slots)
+ "Emulates the SB-ALIEN:SLOT interface, with useful argument order for
+deeply nested structures."
+ (labels ((rewriter (slots)
+ (if (null slots)
+ alien-var
+ `(sb-alien:slot ,(rewriter (rest slots))
+ ',(first slots)))))
+ (rewriter slots)))
+
+(defgeneric accessor-modifier-for (element-type accessor-type))
+
+(defmacro identity-1 (thing &rest ignored)
+ (declare (ignore ignored))
+ thing)
+(defun (setf identity-1) (new-thing place &rest ignored)
+ (declare (ignore ignored))
+ (setf place new-thing))
+
+(defmethod accessor-modifier-for (element-type (accessor-type (eql :getter)))
+ 'identity-1)
+(defmethod accessor-modifier-for ((element-type (eql 'C-STRING))
+ (accessor-type (eql :getter)))
+ 'c-string->lisp-string)
+(defmethod accessor-modifier-for (element-type (accessor-type (eql :setter)))
+ nil)
+(defmethod accessor-modifier-for ((element-type (eql 'C-STRING))
+ (accessor-type (eql :setter)))
+ 'c-string->lisp-string)
+
+(defun c-string->lisp-string (string &optional limit)
+ (declare (ignore limit))
+ (cast string c-string))
+
+(defun (setf c-string->lisp-string) (new-string alien &optional limit)
+ (declare (string new-string))
+ (let* ((upper-bound (or limit (1+ (length new-string))))
+ (last-elt (min (1- upper-bound) (length new-string))))
+ (loop for i upfrom 0 below last-elt
+ for char across new-string
+ do (setf (deref alien i) (char-code char)))
+ (setf (deref alien last-elt) 0)
+ (subseq new-string 0 last-elt)))
+
+(defgeneric accessors-for (struct-name element path))
+(defmethod accessors-for (struct-name (root structured-type) path)
+ nil)
+
+
+(defmethod accessors-for (struct-name (root value-slot) path)
+ (let ((rpath (reverse path))
+ (accessor-name (format nil "~A-~A"
+ (symbol-name struct-name)
+ (symbol-name (name root)))))
+ (labels ((accessor (root rpath)
+ (apply #'sane-slot 'struct (mapcar 'name (append (rest rpath) (list root))))))
+ `((declaim (inline ,(intern accessor-name)
+ (setf ,(intern accessor-name))))
+ (defun ,(intern accessor-name) (struct)
+ (declare (cl:type (alien (* ,struct-name)) struct)
+ (optimize (speed 3)))
+ (,(accessor-modifier-for (reintern (type root) (find-package :sb-grovel))
+ :getter)
+ ,(accessor root rpath) ,(size root)))
+ (defun (setf ,(intern accessor-name)) (new-val struct)
+ (declare (cl:type (alien (* ,struct-name)) struct)
+ (cl:type ,(lisp-type-for (type root) (size root)) new-val)
+ (optimize (speed 3)))
+ ,(let* ((accessor-modifier (accessor-modifier-for (reintern (type root)
+ (find-package :sb-grovel))
+ :setter))
+ (modified-accessor (if accessor-modifier
+ `(,accessor-modifier ,(accessor root rpath) ,(size root))
+ (accessor root rpath))))
+
+ `(setf ,modified-accessor new-val)))
+ (defconstant ,(intern (format nil "OFFSET-OF-~A" accessor-name))
+ ,(offset root))))))
+
+
+
+(defmethod accessors-for (struct (root padding) path)
+ nil)
+
+(defgeneric generate-struct-definition (struct-name root path))
+(defmethod generate-struct-definition (struct-name (root structured-type) path)
+ (let ((naccessors (accessors-for struct-name root path))
+ (nslots nil))
+ (dolist (child (children root))
+ (multiple-value-bind (slots accessors)
+ (generate-struct-definition struct-name child (cons root path))
+ (setf nslots (nconc nslots slots))
+ (setf naccessors (nconc naccessors accessors))))
+ (values `((,(name root) (,(type-of root) ,(name root) ,@nslots)))
+ naccessors)))
+
+(defmethod generate-struct-definition (struct-name (root value-slot) path)
+ (values `((,(name root) ,(alien-type-for (type root) (size root))))
+ (accessors-for struct-name root path)))
+
+(defmacro define-c-struct (name size &rest elements)
+ (multiple-value-bind (struct-elements accessors)
+ (let* ((root (make-instance 'struct :name name :children nil :offset 0)))
+ (loop for e in (sort elements #'< :key #'fourth)
+ do (insert-element root (apply 'mk-val e))
+ finally (return root))
+ (setf (children root)
+ (nconc (children root)
+ (list
+ (mk-padding (max 0 (- size
+ (size root)))
+ (size root)))))
+ (generate-struct-definition name root nil))
`(progn
- (defun ,(p "ALLOCATE-") () (make-array ,size :initial-element 0
- :element-type '(unsigned-byte 8)))
- (defconstant ,(p "SIZE-OF-") ,size)
- (defun ,(p "FREE-" ) (p) (declare (ignore p))))))
+ (sb-alien:define-alien-type ,@(first struct-elements))
+ ,@accessors
+ (defmacro ,(intern (format nil "WITH-~A" name)) (var (&rest field-values) &body body)
+ (labels ((field-name (x)
+ (intern (concatenate 'string
+ (symbol-name ',name) "-"
+ (symbol-name x))
+ ,(symbol-package name))))
+ `(sb-alien:with-alien ((,var (* ,',name) ,'(,(intern (format nil "ALLOCATE-~A" name)))))
+ (unwind-protect
+ (progn
+ (progn ,@(mapcar (lambda (pair)
+ `(setf (,(field-name (first pair)) ,var) ,(second pair)))
+ field-values))
+ ,@body)
+ (funcall ',',(intern (format nil "FREE-~A" name)) ,var)))))
+ (defconstant ,(intern (format nil "SIZE-OF-~A" name)) ,size)
+ (defun ,(intern (format nil "ALLOCATE-~A" name)) ()
+ (let* ((o (sb-alien:make-alien ,name))
+ (c-o (cast o (* (unsigned 8)))))
+ ;; we have to initialize the object to all-0 before we can
+ ;; expect to make sensible use of it - the object returned
+ ;; by make-alien is initialized to all-D0 bytes.
+
+ ;; FIXME: This should be fixed in sb-alien, where better
+ ;; optimizations might be possible.
+ (loop for i from 0 below ,size
+ do (setf (deref c-o i) 0))
+ o))
+ (defun ,(intern (format nil "FREE-~A" name)) (o)
+ (sb-alien:free-alien o)))))
(defun foreign-nullp (c)
"C is a pointer to 0?"
- (= 0 (sb-sys:sap-int (sb-alien:alien-sap c))))
-
-;;; this could be a lot faster if I cared enough to think about it
-(defun foreign-vector (pointer size length)
- "Compose a vector of the words found in foreign memory starting at
-POINTER. Each word is SIZE bytes long; LENGTH gives the number of
-elements of the returned vector. See also FOREIGN-VECTOR-UNTIL-ZERO"
- (assert (= size 1))
- (let ((ptr
- (typecase pointer
- (sb-sys:system-area-pointer
- (sap-alien pointer (* (sb-alien:unsigned 8))))
- (t
- (sb-alien:cast pointer (* (sb-alien:unsigned 8))))))
- (result (make-array length :element-type '(unsigned-byte 8))))
- (loop for i from 0 to (1- length) by size
- do (setf (aref result i) (sb-alien:deref ptr i)))
- result))
+ (null-alien c))
projects / sbcl.git / blobdiff