-;;;; -*- Mode: Lisp; Syntax: ANSI-Common-Lisp; Base: 10; Package: UFFI -*-
-;;;; *************************************************************************
-;;;; FILE IDENTIFICATION
-;;;;
-;;;; Name: objects.cl
-;;;; Purpose: UFFI source to handle objects and pointers
-;;;; Programmers: Kevin M. Rosenberg and John DeSoi
-;;;; Date Started: Feb 2002
-;;;;
-;;;; $Id: objects.cl,v 1.1 2002/08/02 14:39:12 kevin Exp $
-;;;;
-;;;; This file, part of UFFI, is Copyright (c) 2002 by Kevin M. Rosenberg
-;;;; and John DeSoi
-;;;;
-;;;; UFFI users are granted the rights to distribute and use this software
-;;;; as governed by the terms of the Lisp Lesser GNU Public License
-;;;; (http://opensource.franz.com/preamble.html), also known as the LLGPL.
-;;;; *************************************************************************
-
-(declaim (optimize (debug 3) (speed 3) (safety 1) (compilation-speed 0)))
-(in-package :uffi)
-
-
-;;;
-;;; Some MCL specific utilities
-;;;
-(defun foreign-object-size (type)
- "Returns the size for the specified mcl type or record type"
- (let ((mcl-type (ccl:find-mactype type nil t)))
- (if mcl-type
- (ccl::mactype-record-size mcl-type)
- (ccl::record-descriptor-length (ccl:find-record-descriptor type t t)) ) ) ) ;error if not a record
-
-
-; trap macros don't work right directly in the macros
-(eval-when (:compile-toplevel :load-toplevel :execute)
-
-(defun new-ptr (size)
- (#_NewPtr size))
-
-(defun dispose-ptr (ptr)
- (#_DisposePtr ptr))
-
-)
-
-;;;
-;;; Start of standard UFFI
-;;;
-(defmacro allocate-foreign-object (type &optional (size :unspecified))
- "Allocates an instance of TYPE. If size is specified, then allocate
-an array of TYPE with size SIZE."
- (if (eq size :unspecified)
- `(new-ptr ,(foreign-object-size (convert-from-uffi-type type :allocation)))
- `(new-ptr ,(* size (foreign-object-size (convert-from-uffi-type type :allocation))))))
-
-
-
-(defmacro free-foreign-object (obj)
- `(dispose-ptr ,obj))
-
-(defmacro null-pointer-p (obj)
- `(ccl:%null-ptr-p ,obj))
-
-
-(defmacro make-null-pointer (type)
- (declare (ignore type))
- `(ccl:%null-ptr))
-
-
-;! need to check uffi update and see if :routine is the right context
-
-(defun accessor-symbol (type get-or-set)
- "Returns the symbol used to access the foreign type."
- (let* ((mcl-type (convert-from-uffi-type (eval type) :routine))
- (mac-type (ccl:find-mactype mcl-type))
- name)
- (ecase get-or-set
- (:get (setf name (ccl::mactype-get-function mac-type)))
- (:set (setf name (ccl::mactype-set-function mac-type))))
- (find-symbol (symbol-name name) :ccl)))
-
-(defmacro deref-pointer (ptr type)
- `(,(accessor-symbol type :get) ,ptr))
-
-
-(defmacro deref-pointer-set (ptr type value)
- `(,(accessor-symbol type :set) ,ptr ,value))
-
-
-(defsetf deref-pointer deref-pointer-set)
-
-
-(defmacro pointer-address (obj)
- `(ccl:%ptr-to-int ,obj))
-
-
-(defmacro with-foreign-objects (bindings &rest body)
- (let ((simple nil) (recs nil) type)
- (dolist (spec (reverse bindings)) ;keep order - macroexpands to let*
- (setf type (convert-from-uffi-type (eval (nth 1 spec)) :allocate))
- (if (ccl:mactype-p type)
- (push (list (first spec) (foreign-object-size type)) simple)
- (push spec recs)))
- (cond ((and simple recs)
- `(ccl:%stack-block ,simple
- (ccl:rlet ,recs
- ,@body)))
- (simple `(ccl:%stack-block ,simple ,@body))
- (recs `(ccl:rlet ,recs ,@body)))))
-
-
-(defmacro with-foreign-object ((var type) &rest body)
- `(with-foreign-objects ((,var ,type)) ,@body))