Initial checkin

[clg] / gffi / memory.lisp

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+;; Common Lisp bindings for GTK+ v2.x
+;; Copyright 1999-2006 Espen S. Johnsen <espen@users.sf.net>
+;;
+;; Permission is hereby granted, free of charge, to any person obtaining
+;; a copy of this software and associated documentation files (the
+;; "Software"), to deal in the Software without restriction, including
+;; without limitation the rights to use, copy, modify, merge, publish,
+;; distribute, sublicense, and/or sell copies of the Software, and to
+;; permit persons to whom the Software is furnished to do so, subject to
+;; the following conditions:
+;;
+;; The above copyright notice and this permission notice shall be
+;; included in all copies or substantial portions of the Software.
+;;
+;; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+;; EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+;; MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+;; IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+;; CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+;; TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+;; SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+;; $Id: memory.lisp,v 1.1 2006-04-25 20:31:35 espen Exp $
+
+
+(in-package "GFFI")
+
+
+(defun make-pointer (address)
+  #+(or cmu sbcl)(int-sap address)
+  #+clisp(ffi:unsigned-foreign-address address)
+  #-(or cmu sbcl clisp)address)
+
+(defun pointer-address (pointer)
+  #+(or cmu sbcl)(sap-int pointer)
+  #+clisp(ffi:foreign-address-unsigned pointer)
+  #-(or cmu sbcl clisp)pointer)
+
+(defun null-pointer-p (pointer)
+  #+(or cmu sbcl)(zerop (sap-int pointer))
+  #+clisp(or (not pointer) (zerop (pointer-address pointer)))
+  #-(or cmu sbcl clisp)(zerop pointer))
+
+(defun pointer= (pointer1 pointer2)
+  #+(or cmu sbcl)(sap= pointer1 pointer2)
+  #+clisp(= (pointer-address pointer1) (pointer-address pointer2))
+  #-(or cmu sbcl clisp)(= pointer1 pointer2))
+
+(defun pointer+ (pointer offset)
+  #+(or cmu sbcl)(sap+ pointer offset)
+  #+clisp(make-pointer (+ (pointer-address pointer) offset))
+  #-(or cmu sbcl clisp)(+ pointer offset))
+
+(defun ref-pointer (location &optional (offset 0))
+  #+(or cmu sbcl)(sap-ref-sap location offset)
+  #+clisp(ffi:memory-as location 'ffi:c-pointer offset))
+
+(defun (setf ref-pointer) (pointer location &optional (offset 0))
+  (setf 
+   #+(or cmu sbcl)(sap-ref-sap location offset)
+   #+clisp(ffi:memory-as location 'ffi:c-pointer offset)
+   pointer))
+
+(defun ref-byte (location &optional (offset 0))
+  #+(or cmu sbcl)(sap-ref-8 location offset)
+  #+clisp(ffi:memory-as location 'ffi:uchar offset))
+
+(defun (setf ref-byte) (byte location &optional (offset 0))
+  (setf 
+   #+(or cmu sbcl)(sap-ref-8 location offset)
+   #+clisp(ffi:memory-as location 'ffi:uchar offset)
+   byte))
+
+(defun allocate-memory (size)
+  (declare (ignore size))
+  (error "Memory allocator not set"))
+(declaim (ftype (function (integer) system-area-pointer) allocate-memory))
+
+(defun deallocate-memory (location)
+  (declare (ignore location))
+  (warn "Memory deallocator not set"))
+
+(defun copy-memory (from length &optional (to (allocate-memory length)))
+  #+cmu(system-area-copy from 0 to 0 (* 8 length))
+  #+sbcl(system-area-ub8-copy from 0 to 0 length)
+  #-(or cmu sbcl)
+  (loop
+   for offset below length
+   do (setf (ref-byte to offset) (ref-byte from offset)))
+  to)
+
+(defun clear-memory (from length &optional (offset 0))
+  #+sbcl(system-area-ub8-fill 0 from offset length)
+  #-sbcl
+  (loop
+   repeat length
+   for byte-offset from offset
+   do (setf (ref-byte from byte-offset) 0)))
+
+(defun memory-clear-p (from length &optional (offset 0))
+  (loop
+   repeat length
+   for byte-offset from offset
+   unless (zerop (ref-byte from byte-offset))
+   do (return-from memory-clear-p nil))
+  t)
+
+(defmacro with-memory ((var size) &body body)
+  #-clisp
+  (if (and #+(or cmu sbcl)t (constantp size))
+      (let ((memory (make-symbol "MEMORY"))
+           (size (eval size)))
+       `(with-alien ((,memory (array #+sbcl(sb-alien:unsigned 8) #+cmu(alien:unsigned 8) ,size)))
+          (let ((,var (alien-sap ,memory)))
+            (clear-memory ,var ,size)
+            ,@body)))
+    `(let ((,var (allocate-memory ,size)))
+       (unwind-protect
+          (progn ,@body)
+        (deallocate-memory ,var))))
+  #+clisp
+  (let ((memory (make-symbol "MEMORY")))          
+    `(ffi:with-foreign-object (,memory `(ffi:c-array ffi:uint8 ,,size))
+       (let ((,var (ffi:foreign-address ,memory)))
+        ,@body))))
+
+(defmacro with-pointer ((var &optional (pointer '(make-pointer 0))) &body body)
+  "Binds POINTER to VAR in a way which makes it possible to pass the location of VAR to in foreign function call."
+  #+(or cmu sbcl)
+  `(with-alien ((,var system-area-pointer ,pointer))
+     ,@body)
+  #+clisp
+  `(ffi:with-c-var (,var `ffi:c-pointer ,pointer)
+     ,@body))
+
+
+#+sbcl
+(progn
+  (defun sb-sizeof-bits (type)
+    (sb-alien-internals:alien-type-bits
+     (sb-alien-internals:parse-alien-type type nil)))
+
+  (defun sb-sizeof (type)
+    (/ (sb-sizeof-bits type) 8)))