-;;;; Loading shared object files
+;;;; Loading shared object files, Win32 specifics
;;;; This software is part of the SBCL system. See the README file for
;;;; more information.
(in-package "SB!ALIEN")
-;;; Used to serialize modifications to *linkage-info*,
-;;; *shared-objects* and the linkage-table proper. Calls thru
-;;; linkage-table are unaffected.
-(defvar *shared-objects-lock*
- (sb!thread:make-mutex :name "shared object list lock"))
-
-(define-unsupported-fun load-foreign
- "Unsupported as of SBCL 0.8.13. See LOAD-SHARED-OBJECT."
- "~S is unsupported as of SBCL 0.8.13. See LOAD-SHARED-OBJECT."
- (load-foreign))
-
-(define-unsupported-fun load-1-foreign
- "Unsupported as of SBCL 0.8.13. Please use LOAD-SHARED-OBJECT."
- "~S is unsupported as of SBCL 0.8.13. Please use LOAD-SHARED-OBJECT."
- (load-1-foreign))
-
(define-alien-type hinstance long)
(define-alien-routine ("LoadLibraryA@4" loadlibrary) hinstance
(define-alien-routine ("GetLastError@0" getlasterror) unsigned-int)
-(defvar *shared-objects*)
-
-(defstruct shared-object file handle)
-
(defun dlopen-or-lose (obj)
- (let* ((file (shared-object-file obj))
- (handle (loadlibrary file)))
- (aver file)
+ (let* ((namestring (shared-object-namestring obj))
+ (handle (loadlibrary namestring)))
+ (aver namestring)
(when (zerop handle)
(setf (shared-object-handle obj) nil)
(error "Error opening shared object ~S:~% ~A."
- file (getlasterror)))
+ namestring (getlasterror)))
(setf (shared-object-handle obj) handle)
handle))
(defun dlclose-or-lose (&optional (obj nil objp))
- (let (dlerror)
- (cond ((and objp (shared-object-handle obj))
- (setf dlerror (if (freelibrary (shared-object-handle obj))
- nil
- (getlasterror))
- (shared-object-handle obj) nil)))
- (when dlerror
- (cerror "Ignore the error and continue anyway" "dlerror returned an error: ~S" dlerror))))
-
-(defun load-shared-object (file)
- "Load a shared library/dynamic shared object file/general dlopenable
-alien container, such as a .so on an ELF platform.
-
-Reloading the same shared object will replace the old definitions; if
-a symbol was previously referenced thru the object and is not present
-in the reloaded version an error will be signalled. Sameness is
-determined using the library filename. Reloading may not work as
-expected if user or library-code has called dlopen on FILE.
-
-References to foreign symbols in loaded shared objects do not survive
-intact through SB-EXT:SAVE-LISP-AND-DIE on all platforms. See
-SB-EXT:SAVE-LISP-AND-DIE for details."
- ;; FIXME: 1. This is copy-paste from foreign-load.lisp.
- ;; FIXME: 2. Once windows gets threads, this is going to need a lock.
- ;; FIXME: 3. No linkage table on windows?
- (let* ((filename (or (unix-namestring file) file))
- (old (find filename *shared-objects* :key #'shared-object-file :test #'equal))
- (obj (or old (make-shared-object :file filename))))
- (unless old
- (dlopen-or-lose obj))
- (setf *shared-objects* (append (remove obj *shared-objects*)
- (list obj)))
- (pathname filename)))
-
-(defun try-reopen-shared-object (obj)
- (declare (type shared-object obj))
- (tagbody :dlopen
- (restart-case
- (dlopen-or-lose obj)
- (continue ()
- :report "Skip this shared object and continue."
- (setf (shared-object-handle obj) nil))
- (retry ()
- :report "Retry loading this shared object."
- (go :dlopen))
- (load-other ()
- :report "Specify an alternate shared object file to load."
- (setf (shared-object-file obj)
- (tagbody :query
- (format *query-io* "~&Enter pathname (evaluated):~%")
- (force-output *query-io*)
- (let ((pathname (ignore-errors (pathname (read *query-io*)))))
- (unless (pathnamep pathname)
- (format *query-io* "~&Error: invalid pathname.~%")
- (go :query))
- (unix-namestring pathname)))))))
- obj)
-
-;;; Open libraries in *SHARED-OBJECTS* and the runtime. Called during
-;;; initialization.
-;;; Note that, so long as we don't have linkage-table, this is braindead.
-(defun reopen-shared-objects ()
- (setf *shared-objects* (mapcar #'try-reopen-shared-object *shared-objects*)))
-
-;;; Close all dlopened libraries and clear out sap entries in
-;;; *SHARED-OBJECTS*.
-(defun close-shared-objects ()
- (mapc #'dlclose-or-lose (reverse *shared-objects*)))
+ (when (and objp (shared-object-handle obj))
+ (unless (freelibrary (shared-object-handle obj))
+ (cerror "Ignore the error and continue as if closing succeeded."
+ "FreeLibrary() caused an error while trying to close ~
+ shared object ~S: ~S"
+ (shared-object-namestring obj)
+ (getlasterror)))
+ (setf (shared-object-handle obj) nil)))
(defun find-dynamic-foreign-symbol-address (symbol)
;; On real ELF & dlsym platforms the EXTERN-ALIEN-NAME is a no-op,
(when (not (zerop result))
(return result)))))))
-(let ((symbols (make-hash-table :test #'equal))
- (undefineds (make-hash-table :test #'equal)))
- (defun ensure-dynamic-foreign-symbol-address (symbol &optional datap)
- "Returns the address of the foreign symbol as an integer. On linkage-table
-ports if the symbols isn't found a special guard address is returned instead,
-accesses to which will result in an UNDEFINED-ALIEN-ERROR. On other ports an
-error is immediately signalled if the symbol isn't found. The returned address
-is never in the linkage-table."
- (declare (ignorable datap))
- (let ((addr (find-dynamic-foreign-symbol-address symbol)))
- (cond ((not addr)
- (error 'undefined-alien-error :name symbol))
- (addr
- (setf (gethash symbol symbols) t)
- (remhash symbol undefineds)
- addr))))
- (defun undefined-foreign-symbols-p ()
- (plusp (hash-table-count undefineds)))
- (defun dynamic-foreign-symbols-p ()
- (plusp (hash-table-count symbols)))
- (defun list-dynamic-foreign-symbols ()
- (loop for symbol being each hash-key in symbols
- collect symbol)))
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