external/cffi.darcs/_darcs/pristine/src/cffi-openmcl.lisp

   1 ;;;; -*- Mode: lisp; indent-tabs-mode: nil -*-
   2 ;;;
   3 ;;; cffi-openmcl.lisp --- CFFI-SYS implementation for OpenMCL.
   4 ;;;
   5 ;;; Copyright (C) 2005-2006, James Bielman  <jamesjb@jamesjb.com>
   6 ;;;
   7 ;;; Permission is hereby granted, free of charge, to any person
   8 ;;; obtaining a copy of this software and associated documentation
   9 ;;; files (the "Software"), to deal in the Software without
  10 ;;; restriction, including without limitation the rights to use, copy,
  11 ;;; modify, merge, publish, distribute, sublicense, and/or sell copies
  12 ;;; of the Software, and to permit persons to whom the Software is
  13 ;;; furnished to do so, subject to the following conditions:
  14 ;;;
  15 ;;; The above copyright notice and this permission notice shall be
  16 ;;; included in all copies or substantial portions of the Software.
  17 ;;;
  18 ;;; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  19 ;;; EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20 ;;; MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  21 ;;; NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
  22 ;;; HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  23 ;;; WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  24 ;;; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  25 ;;; DEALINGS IN THE SOFTWARE.
  26 ;;;
  27
  28 ;;;# Administrivia
  29
  30 (defpackage #:cffi-sys
  31   (:use #:common-lisp #:ccl #:cffi-utils #:alexandria)
  32   (:export
  33    #:canonicalize-symbol-name-case
  34    #:foreign-pointer
  35    #:pointerp  ; ccl:pointerp
  36    #:pointer-eq
  37    #:%foreign-alloc
  38    #:foreign-free
  39    #:with-foreign-pointer
  40    #:null-pointer
  41    #:null-pointer-p
  42    #:inc-pointer
  43    #:make-pointer
  44    #:pointer-address
  45    #:%mem-ref
  46    #:%mem-set
  47    #:%foreign-funcall
  48    #:%foreign-funcall-pointer
  49    #:%foreign-type-alignment
  50    #:%foreign-type-size
  51    #:%load-foreign-library
  52    #:%close-foreign-library
  53    #:native-namestring
  54    #:make-shareable-byte-vector
  55    #:with-pointer-to-vector-data
  56    #:%foreign-symbol-pointer
  57    #:%defcallback
  58    #:%callback))
  59
  60 (in-package #:cffi-sys)
  61
  62 ;;;# Mis-features
  63
  64 (eval-when (:compile-toplevel :load-toplevel :execute)
  65   (mapc (lambda (feature) (pushnew feature *features*))
  66         '(cffi-features:flat-namespace)))
  67
  68 ;;;# Symbol Case
  69
  70 (defun canonicalize-symbol-name-case (name)
  71   (declare (string name))
  72   (string-upcase name))
  73
  74 ;;;# Allocation
  75 ;;;
  76 ;;; Functions and macros for allocating foreign memory on the stack
  77 ;;; and on the heap.  The main CFFI package defines macros that wrap
  78 ;;; FOREIGN-ALLOC and FOREIGN-FREE in UNWIND-PROTECT for the common
  79 ;;; usage when the memory has dynamic extent.
  80
  81 (defun %foreign-alloc (size)
  82   "Allocate SIZE bytes on the heap and return a pointer."
  83   (ccl::malloc size))
  84
  85 (defun foreign-free (ptr)
  86   "Free a PTR allocated by FOREIGN-ALLOC."
  87   ;; TODO: Should we make this a dead macptr?
  88   (ccl::free ptr))
  89
  90 (defmacro with-foreign-pointer ((var size &optional size-var) &body body)
  91   "Bind VAR to SIZE bytes of foreign memory during BODY.  The
  92 pointer in VAR is invalid beyond the dynamic extent of BODY, and
  93 may be stack-allocated if supported by the implementation.  If
  94 SIZE-VAR is supplied, it will be bound to SIZE during BODY."
  95   (unless size-var
  96     (setf size-var (gensym "SIZE")))
  97   `(let ((,size-var ,size))
  98      (%stack-block ((,var ,size-var))
  99        ,@body)))
 100
 101 ;;;# Misc. Pointer Operations
 102
 103 (deftype foreign-pointer ()
 104   'ccl:macptr)
 105
 106 (defun null-pointer ()
 107   "Construct and return a null pointer."
 108   (ccl:%null-ptr))
 109
 110 (defun null-pointer-p (ptr)
 111   "Return true if PTR is a null pointer."
 112   (ccl:%null-ptr-p ptr))
 113
 114 (defun inc-pointer (ptr offset)
 115   "Return a pointer OFFSET bytes past PTR."
 116   (ccl:%inc-ptr ptr offset))
 117
 118 (defun pointer-eq (ptr1 ptr2)
 119   "Return true if PTR1 and PTR2 point to the same address."
 120   (ccl:%ptr-eql ptr1 ptr2))
 121
 122 (defun make-pointer (address)
 123   "Return a pointer pointing to ADDRESS."
 124   (ccl:%int-to-ptr address))
 125
 126 (defun pointer-address (ptr)
 127   "Return the address pointed to by PTR."
 128   (ccl:%ptr-to-int ptr))
 129
 130 ;;;# Shareable Vectors
 131 ;;;
 132 ;;; This interface is very experimental.  WITH-POINTER-TO-VECTOR-DATA
 133 ;;; should be defined to perform a copy-in/copy-out if the Lisp
 134 ;;; implementation can't do this.
 135
 136 (defun make-shareable-byte-vector (size)
 137   "Create a Lisp vector of SIZE bytes that can passed to
 138 WITH-POINTER-TO-VECTOR-DATA."
 139   (make-array size :element-type '(unsigned-byte 8)))
 140
 141 (defmacro with-pointer-to-vector-data ((ptr-var vector) &body body)
 142   "Bind PTR-VAR to a foreign pointer to the data in VECTOR."
 143   `(ccl:with-pointer-to-ivector (,ptr-var ,vector)
 144      ,@body))
 145
 146 ;;;# Dereferencing
 147
 148 ;;; Define the %MEM-REF and %MEM-SET functions, as well as compiler
 149 ;;; macros that optimize the case where the type keyword is constant
 150 ;;; at compile-time.
 151 (defmacro define-mem-accessors (&body pairs)
 152   `(progn
 153     (defun %mem-ref (ptr type &optional (offset 0))
 154       (ecase type
 155         ,@(loop for (keyword fn) in pairs
 156                 collect `(,keyword (,fn ptr offset)))))
 157     (defun %mem-set (value ptr type &optional (offset 0))
 158       (ecase type
 159         ,@(loop for (keyword fn) in pairs
 160                 collect `(,keyword (setf (,fn ptr offset) value)))))
 161     (define-compiler-macro %mem-ref
 162         (&whole form ptr type &optional (offset 0))
 163       (if (constantp type)
 164           (ecase (eval type)
 165             ,@(loop for (keyword fn) in pairs
 166                     collect `(,keyword `(,',fn ,ptr ,offset))))
 167           form))
 168     (define-compiler-macro %mem-set
 169         (&whole form value ptr type &optional (offset 0))
 170       (if (constantp type)
 171           (once-only (value)
 172             (ecase (eval type)
 173               ,@(loop for (keyword fn) in pairs
 174                       collect `(,keyword `(setf (,',fn ,ptr ,offset)
 175                                                 ,value)))))
 176           form))))
 177
 178 (define-mem-accessors
 179   (:char %get-signed-byte)
 180   (:unsigned-char %get-unsigned-byte)
 181   (:short %get-signed-word)
 182   (:unsigned-short %get-unsigned-word)
 183   (:int %get-signed-long)
 184   (:unsigned-int %get-unsigned-long)
 185   #+32-bit-target (:long %get-signed-long)
 186   #+64-bit-target (:long ccl::%%get-signed-longlong)
 187   #+32-bit-target (:unsigned-long %get-unsigned-long)
 188   #+64-bit-target (:unsigned-long ccl::%%get-unsigned-longlong)
 189   (:long-long ccl::%get-signed-long-long)
 190   (:unsigned-long-long ccl::%get-unsigned-long-long)
 191   (:float %get-single-float)
 192   (:double %get-double-float)
 193   (:pointer %get-ptr))
 194
 195 ;;;# Calling Foreign Functions
 196
 197 (defun convert-foreign-type (type-keyword)
 198   "Convert a CFFI type keyword to an OpenMCL type."
 199   (ecase type-keyword
 200     (:char                :signed-byte)
 201     (:unsigned-char       :unsigned-byte)
 202     (:short               :signed-short)
 203     (:unsigned-short      :unsigned-short)
 204     (:int                 :signed-int)
 205     (:unsigned-int        :unsigned-int)
 206     (:long                :signed-long)
 207     (:unsigned-long       :unsigned-long)
 208     (:long-long           :signed-doubleword)
 209     (:unsigned-long-long  :unsigned-doubleword)
 210     (:float               :single-float)
 211     (:double              :double-float)
 212     (:pointer             :address)
 213     (:void                :void)))
 214
 215 (defun %foreign-type-size (type-keyword)
 216   "Return the size in bytes of a foreign type."
 217   (/ (ccl::foreign-type-bits
 218       (ccl::parse-foreign-type
 219        (convert-foreign-type type-keyword))) 8))
 220
 221 ;; There be dragons here.  See the following thread for details:
 222 ;; http://clozure.com/pipermail/openmcl-devel/2005-June/002777.html
 223 (defun %foreign-type-alignment (type-keyword)
 224   "Return the alignment in bytes of a foreign type."
 225   (/ (ccl::foreign-type-alignment
 226       (ccl::parse-foreign-type
 227        (convert-foreign-type type-keyword))) 8))
 228
 229 (defun convert-foreign-funcall-types (args)
 230   "Convert foreign types for a call to FOREIGN-FUNCALL."
 231   (loop for (type arg) on args by #'cddr
 232         collect (convert-foreign-type type)
 233         if arg collect arg))
 234
 235 (defun convert-external-name (name)
 236   "Add an underscore to NAME if necessary for the ABI."
 237   #+darwinppc-target (concatenate 'string "_" name)
 238   #-darwinppc-target name)
 239
 240 (defmacro %foreign-funcall (function-name args &key library calling-convention)
 241   "Perform a foreign function call, document it more later."
 242   (declare (ignore library calling-convention))
 243   `(external-call
 244     ,(convert-external-name function-name)
 245     ,@(convert-foreign-funcall-types args)))
 246
 247 (defmacro %foreign-funcall-pointer (ptr args &key calling-convention)
 248   (declare (ignore calling-convention))
 249   `(ff-call ,ptr ,@(convert-foreign-funcall-types args)))
 250
 251 ;;;# Callbacks
 252
 253 ;;; The *CALLBACKS* hash table maps CFFI callback names to OpenMCL "macptr"
 254 ;;; entry points.  It is safe to store the pointers directly because
 255 ;;; OpenMCL will update the address of these pointers when a saved image
 256 ;;; is loaded (see CCL::RESTORE-PASCAL-FUNCTIONS).
 257 (defvar *callbacks* (make-hash-table))
 258
 259 ;;; Create a package to contain the symbols for callback functions.  We
 260 ;;; want to redefine callbacks with the same symbol so the internal data
 261 ;;; structures are reused.
 262 (defpackage #:cffi-callbacks
 263   (:use))
 264
 265 ;;; Intern a symbol in the CFFI-CALLBACKS package used to name the internal
 266 ;;; callback for NAME.
 267 (defun intern-callback (name)
 268   (intern (format nil "~A::~A" (package-name (symbol-package name))
 269                   (symbol-name name))
 270           '#:cffi-callbacks))
 271
 272 (defmacro %defcallback (name rettype arg-names arg-types body
 273                         &key calling-convention)
 274   (declare (ignore calling-convention))
 275   (let ((cb-name (intern-callback name)))
 276     `(progn
 277        (defcallback ,cb-name
 278            (,@(mapcan (lambda (sym type)
 279                         (list (convert-foreign-type type) sym))
 280                       arg-names arg-types)
 281             ,(convert-foreign-type rettype))
 282          ,body)
 283        (setf (gethash ',name *callbacks*) (symbol-value ',cb-name)))))
 284
 285 (defun %callback (name)
 286   (or (gethash name *callbacks*)
 287       (error "Undefined callback: ~S" name)))
 288
 289 ;;;# Loading Foreign Libraries
 290
 291 (defun %load-foreign-library (name path)
 292   "Load the foreign library NAME."
 293   (declare (ignore name))
 294   (open-shared-library path))
 295
 296 (defun %close-foreign-library (name)
 297   "Close the foreign library NAME."
 298   (close-shared-library name)) ; :completely t ?
 299
 300 (defun native-namestring (pathname)
 301   (ccl::native-translated-namestring pathname))
 302
 303 ;;;# Foreign Globals
 304
 305 (defun %foreign-symbol-pointer (name library)
 306   "Returns a pointer to a foreign symbol NAME."
 307   (declare (ignore library))
 308   (foreign-symbol-address (convert-external-name name)))