X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fpcl%2Fstd-class.lisp;h=d60c04c3858ed8e0c23a0f20c856b0f26e238188;hb=f4e8bca5eaa6e6db42299fe2f3852fb2e07508c7;hp=6b9f967dd870e48c1eb5c1d1cf819c042a331067;hpb=f6a2be77637d025bfded9430f02863c28f74f77a;p=sbcl.git diff --git a/src/pcl/std-class.lisp b/src/pcl/std-class.lisp index 6b9f967..d60c04c 100644 --- a/src/pcl/std-class.lisp +++ b/src/pcl/std-class.lisp @@ -86,6 +86,20 @@ (compute-slot-accessor-info slotd type gf))) (initialize-internal-slot-gfs name))) +;;; CMUCL (Gerd PCL 2003-04-25) comment: +;;; +;;; Compute an effective method for SLOT-VALUE-USING-CLASS, (SETF +;;; SLOT-VALUE-USING-CLASS) or SLOT-BOUNDP-USING-CLASS for reading/ +;;; writing/testing effective slot SLOTD. +;;; +;;; TYPE is one of the symbols READER, WRITER or BOUNDP, depending on +;;; GF. Store the effective method in the effective slot definition +;;; object itself; these GFs have special dispatch functions calling +;;; effective methods directly retrieved from effective slot +;;; definition objects, as an optimization. +;;; +;;; FIXME: Change the function name to COMPUTE-SVUC-SLOTD-FUNCTION, +;;; or some such. (defmethod compute-slot-accessor-info ((slotd effective-slot-definition) type gf) (let* ((name (slot-value slotd 'name)) @@ -104,68 +118,24 @@ (defmethod slot-definition-allocation ((slotd structure-slot-definition)) :instance) -(defmethod shared-initialize :after ((object documentation-mixin) - slot-names - &key (documentation nil documentation-p)) - (declare (ignore slot-names)) - (when documentation-p - (setf (plist-value object 'documentation) documentation))) - -;;; default if DOC-TYPE doesn't match one of the specified types -(defmethod documentation (object doc-type) - (warn "unsupported DOCUMENTATION: type ~S for object ~S" - doc-type - (type-of object)) - nil) - -;;; default if DOC-TYPE doesn't match one of the specified types -(defmethod (setf documentation) (new-value object doc-type) - ;; CMU CL made this an error, but since ANSI says that even for supported - ;; doc types an implementation is permitted to discard docs at any time - ;; for any reason, this feels to me more like a warning. -- WHN 19991214 - (warn "discarding unsupported DOCUMENTATION of type ~S for object ~S" - doc-type - (type-of object)) - new-value) - -(defmethod documentation ((object documentation-mixin) doc-type) - (declare (ignore doc-type)) - (plist-value object 'documentation)) - -(defmethod (setf documentation) (new-value - (object documentation-mixin) - doc-type) - (declare (ignore doc-type)) - (setf (plist-value object 'documentation) new-value)) - -(defmethod documentation ((slotd standard-slot-definition) doc-type) - (declare (ignore doc-type)) - (slot-value slotd 'documentation)) - -(defmethod (setf documentation) (new-value - (slotd standard-slot-definition) - doc-type) - (declare (ignore doc-type)) - (setf (slot-value slotd 'documentation) new-value)) - ;;;; various class accessors that are a little more complicated than can be ;;;; done with automatically generated reader methods -(defmethod class-finalized-p ((class pcl-class)) - (with-slots (wrapper) class - (not (null wrapper)))) - -(defmethod class-prototype ((class std-class)) - (with-slots (prototype) class - (or prototype (setq prototype (allocate-instance class))))) - -(defmethod class-prototype ((class structure-class)) - (with-slots (prototype wrapper defstruct-constructor) class - (or prototype - (setq prototype - (if defstruct-constructor - (allocate-instance class) - (allocate-standard-instance wrapper)))))) +(defmethod class-prototype :before (class) + (unless (class-finalized-p class) + (error "~S not yet finalized, cannot allocate a prototype." class))) + +;;; KLUDGE: For some reason factoring the common body into a function +;;; breaks PCL bootstrapping, so just generate it with a macrolet for +;;; all. +(macrolet ((def (class) + `(defmethod class-prototype ((class ,class)) + (with-slots (prototype) class + (or prototype + (setf prototype (allocate-instance class))))))) + (def std-class) + (def condition-class) + (def structure-class)) (defmethod class-direct-default-initargs ((class slot-class)) (plist-value class 'direct-default-initargs)) @@ -175,6 +145,8 @@ (defmethod class-slot-cells ((class std-class)) (plist-value class 'class-slot-cells)) +(defmethod (setf class-slot-cells) (new-value (class std-class)) + (setf (plist-value class 'class-slot-cells) new-value)) ;;;; class accessors that are even a little bit more complicated than those ;;;; above. These have a protocol for updating them, we must implement that @@ -313,41 +285,53 @@ (defmethod shared-initialize :after ((specl eql-specializer) slot-names &key) (declare (ignore slot-names)) - (setf (slot-value specl 'type) `(eql ,(specializer-object specl)))) - -(defun real-load-defclass (name metaclass-name supers slots other) - (let ((res (apply #'ensure-class name :metaclass metaclass-name - :direct-superclasses supers - :direct-slots slots - :definition-source `((defclass ,name) - ,*load-truename*) - other))) - ;; Defclass of a class with a forward-referenced superclass does not - ;; have a wrapper. RES is the incomplete PCL class. The Lisp class - ;; does not yet exist. Maybe should return NIL in that case as RES - ;; is not useful to the user? - (and (class-wrapper res) (sb-kernel:layout-class (class-wrapper res))))) + (setf (slot-value specl 'type) + `(eql ,(specializer-object specl))) + (setf (info :type :translator specl) + (constantly (make-member-type :members (list (specializer-object specl)))))) + +(defun real-load-defclass (name metaclass-name supers slots other + readers writers slot-names) + (with-single-package-locked-error (:symbol name "defining ~S as a class") + (%compiler-defclass name readers writers slot-names) + (let ((res (apply #'ensure-class name :metaclass metaclass-name + :direct-superclasses supers + :direct-slots slots + :definition-source `((defclass ,name) + ,*load-pathname*) + other))) + res))) (setf (gdefinition 'load-defclass) #'real-load-defclass) -(defun ensure-class (name &rest all) - (apply #'ensure-class-using-class name (find-class name nil) all)) +(defun ensure-class (name &rest args) + (apply #'ensure-class-using-class + (let ((class (find-class name nil))) + (when (and class (eq name (class-name class))) + ;; NAME is the proper name of CLASS, so redefine it + class)) + name + args)) -(defmethod ensure-class-using-class (name (class null) &rest args &key) +(defmethod ensure-class-using-class ((class null) name &rest args &key) (multiple-value-bind (meta initargs) (ensure-class-values class args) - (setf class (apply #'make-instance meta :name name initargs) - (find-class name) class) - (inform-type-system-about-class class name) + (set-class-type-translation (class-prototype meta) name) + (setf class (apply #'make-instance meta :name name initargs)) + (without-package-locks + (setf (find-class name) class)) + (set-class-type-translation class name) class)) -(defmethod ensure-class-using-class (name (class pcl-class) &rest args &key) +(defmethod ensure-class-using-class ((class pcl-class) name &rest args &key) (multiple-value-bind (meta initargs) (ensure-class-values class args) - (unless (eq (class-of class) meta) (change-class class meta)) + (unless (eq (class-of class) meta) + (apply #'change-class class meta initargs)) (apply #'reinitialize-instance class initargs) - (setf (find-class name) class) - (inform-type-system-about-class class name) + (without-package-locks + (setf (find-class name) class)) + (set-class-type-translation class name) class)) (defmethod class-predicate-name ((class t)) @@ -356,39 +340,31 @@ (defun fix-super (s) (cond ((classp s) s) ((not (legal-class-name-p s)) - (error "~S is not a class or a legal class name." s)) + (error "~S is not a class or a legal class name." s)) (t - (or (find-class s nil) - (setf (find-class s) - (make-instance 'forward-referenced-class - :name s)))))) - -(defun ensure-class-values (class args) - (let* ((initargs (copy-list args)) - (unsupplied (list 1)) - (supplied-meta (getf initargs :metaclass unsupplied)) - (supplied-supers (getf initargs :direct-superclasses unsupplied)) - (supplied-slots (getf initargs :direct-slots unsupplied)) - (meta - (cond ((neq supplied-meta unsupplied) - (find-class supplied-meta)) - ((or (null class) - (forward-referenced-class-p class)) - *the-class-standard-class*) - (t - (class-of class))))) - (loop (unless (remf initargs :metaclass) (return))) - (loop (unless (remf initargs :direct-superclasses) (return))) - (loop (unless (remf initargs :direct-slots) (return))) - (values meta - (list* :direct-superclasses - (and (neq supplied-supers unsupplied) - (mapcar #'fix-super supplied-supers)) - :direct-slots - (and (neq supplied-slots unsupplied) supplied-slots) - initargs)))) - + (or (find-class s nil) + (make-instance 'forward-referenced-class + :name s))))) + +(defun ensure-class-values (class initargs) + (let (metaclass metaclassp reversed-plist) + (doplist (key val) initargs + (cond ((eq key :metaclass) + (setf metaclass val + metaclassp key)) + (t + (when (eq key :direct-superclasses) + (setf val (mapcar #'fix-super val))) + (setf reversed-plist (list* val key reversed-plist))))) + (values (cond (metaclassp + (find-class metaclass)) + ((or (null class) (forward-referenced-class-p class)) + *the-class-standard-class*) + (t + (class-of class))) + (nreverse reversed-plist)))) + (defmethod shared-initialize :after ((class std-class) slot-names @@ -396,7 +372,6 @@ (direct-slots nil direct-slots-p) (direct-default-initargs nil direct-default-initargs-p) (predicate-name nil predicate-name-p)) - (declare (ignore slot-names)) (cond (direct-superclasses-p (setq direct-superclasses (or direct-superclasses @@ -426,15 +401,22 @@ (setq direct-default-initargs (plist-value class 'direct-default-initargs))) (setf (plist-value class 'class-slot-cells) - (let (collect) + (let ((old-class-slot-cells (plist-value class 'class-slot-cells)) + (collect '())) (dolist (dslotd direct-slots) - (when (eq (slot-definition-allocation dslotd) class) - (let ((initfunction (slot-definition-initfunction dslotd))) - (push (cons (slot-definition-name dslotd) - (if initfunction - (funcall initfunction) - +slot-unbound+)) - collect)))) + (when (eq :class (slot-definition-allocation dslotd)) + ;; see CLHS 4.3.6 + (let* ((name (slot-definition-name dslotd)) + (old (assoc name old-class-slot-cells))) + (if (or (not old) + (eq t slot-names) + (member name slot-names)) + (let* ((initfunction (slot-definition-initfunction dslotd)) + (value (if initfunction + (funcall initfunction) + +slot-unbound+))) + (push (cons name value) collect)) + (push old collect))))) (nreverse collect))) (setq predicate-name (if predicate-name-p (setf (slot-value class 'predicate-name) @@ -444,9 +426,72 @@ (make-class-predicate-name (class-name class)))))) (add-direct-subclasses class direct-superclasses) - (update-class class nil) (make-class-predicate class predicate-name) - (add-slot-accessors class direct-slots)) + (update-class class nil) + (do* ((slots (slot-value class 'slots) (cdr slots)) + (dupes nil)) + ((null slots) (when dupes + (style-warn + ;; FIXME: the indentation request ("~4I") + ;; below appears not to do anything. Finding + ;; out why would be nice. -- CSR, 2003-04-24 + "~@~@:>" + class + dupes))) + (let* ((slot (car slots)) + (oslots (remove (slot-definition-name slot) (cdr slots) + :test #'string/= :key #'slot-definition-name))) + (when oslots + (pushnew (cons (slot-definition-name slot) + (mapcar #'slot-definition-name oslots)) + dupes + :test #'string= :key #'car)))) + (add-slot-accessors class direct-slots) + (make-preliminary-layout class)) + +(defmethod shared-initialize :after ((class forward-referenced-class) + slot-names &key &allow-other-keys) + (declare (ignore slot-names)) + (make-preliminary-layout class)) + +(defvar *allow-forward-referenced-classes-in-cpl-p* nil) + +;;; Give CLASS a preliminary layout if it doesn't have one already, to +;;; make it known to the type system. +(defun make-preliminary-layout (class) + (flet ((compute-preliminary-cpl (root) + (let ((*allow-forward-referenced-classes-in-cpl-p* t)) + (compute-class-precedence-list root)))) + (without-package-locks + (unless (class-finalized-p class) + (let ((name (class-name class))) + (setf (find-class name) class) + ;; KLUDGE: This is fairly horrible. We need to make a + ;; full-fledged CLASSOID here, not just tell the compiler that + ;; some class is forthcoming, because there are legitimate + ;; questions one can ask of the type system, implemented in + ;; terms of CLASSOIDs, involving forward-referenced classes. So. + (when (and (eq *boot-state* 'complete) + (null (find-classoid name nil))) + (setf (find-classoid name) + (make-standard-classoid :name name))) + (set-class-type-translation class name) + (let ((layout (make-wrapper 0 class)) + (classoid (find-classoid name))) + (setf (layout-classoid layout) classoid) + (setf (classoid-pcl-class classoid) class) + (setf (slot-value class 'wrapper) layout) + (let ((cpl (compute-preliminary-cpl class))) + (setf (layout-inherits layout) + (order-layout-inherits + (map 'simple-vector #'class-wrapper + (reverse (rest cpl)))))) + (register-layout layout :invalidate t) + (setf (classoid-layout classoid) layout) + (mapc #'make-preliminary-layout (class-direct-subclasses class)))))))) + (defmethod shared-initialize :before ((class class) slot-names &key name) (declare (ignore slot-names name)) @@ -467,27 +512,95 @@ (lambda (dependent) (apply #'update-dependent class dependent initargs)))) -(defmethod shared-initialize :after ((slotd standard-slot-definition) - slot-names &key) +(defmethod shared-initialize :after ((class condition-class) slot-names + &key direct-slots direct-superclasses) (declare (ignore slot-names)) - (with-slots (allocation class) - slotd - (setq allocation (if (eq allocation :class) class allocation)))) + (let ((classoid (find-classoid (class-name class)))) + (with-slots (wrapper class-precedence-list cpl-available-p + prototype predicate-name + (direct-supers direct-superclasses)) + class + (setf (slot-value class 'direct-slots) + (mapcar (lambda (pl) (make-direct-slotd class pl)) + direct-slots)) + (setf (slot-value class 'finalized-p) t) + (setf (classoid-pcl-class classoid) class) + (setq direct-supers direct-superclasses) + (setq wrapper (classoid-layout classoid)) + (setq class-precedence-list (compute-class-precedence-list class)) + (setq cpl-available-p t) + (add-direct-subclasses class direct-superclasses) + (setq predicate-name (make-class-predicate-name (class-name class))) + (make-class-predicate class predicate-name) + (setf (slot-value class 'slots) (compute-slots class)))) + ;; Comment from Gerd's PCL, 2003-05-15: + ;; + ;; We don't ADD-SLOT-ACCESSORS here because we don't want to + ;; override condition accessors with generic functions. We do this + ;; differently. + (update-pv-table-cache-info class)) + +(defmethod direct-slot-definition-class ((class condition-class) + &rest initargs) + (declare (ignore initargs)) + (find-class 'condition-direct-slot-definition)) -(defmethod shared-initialize :after ((slotd structure-slot-definition) - slot-names - &key (allocation :instance)) - (declare (ignore slot-names)) +(defmethod effective-slot-definition-class ((class condition-class) + &rest initargs) + (declare (ignore initargs)) + (find-class 'condition-effective-slot-definition)) + +(defmethod finalize-inheritance ((class condition-class)) + (aver (slot-value class 'finalized-p)) + nil) + +(defmethod compute-effective-slot-definition + ((class condition-class) slot-name dslotds) + (let ((slotd (call-next-method))) + (setf (slot-definition-reader-function slotd) + (lambda (x) + (handler-case (condition-reader-function x slot-name) + ;; FIXME: FIND-SLOT-DEFAULT throws an error if the slot + ;; is unbound; maybe it should be a CELL-ERROR of some + ;; sort? + (error () (values (slot-unbound class x slot-name)))))) + (setf (slot-definition-writer-function slotd) + (lambda (v x) + (condition-writer-function x v slot-name))) + (setf (slot-definition-boundp-function slotd) + (lambda (x) + (multiple-value-bind (v c) + (ignore-errors (condition-reader-function x slot-name)) + (declare (ignore v)) + (null c)))) + slotd)) + +(defmethod compute-slots ((class condition-class)) + (mapcan (lambda (superclass) + (mapcar (lambda (dslotd) + (compute-effective-slot-definition + class (slot-definition-name dslotd) (list dslotd))) + (class-direct-slots superclass))) + (reverse (slot-value class 'class-precedence-list)))) + +(defmethod compute-slots :around ((class condition-class)) + (let ((eslotds (call-next-method))) + (mapc #'initialize-internal-slot-functions eslotds) + eslotds)) + +(defmethod shared-initialize :after + ((slotd structure-slot-definition) slot-names &key + (allocation :instance) allocation-class) + (declare (ignore slot-names allocation-class)) (unless (eq allocation :instance) (error "Structure slots must have :INSTANCE allocation."))) (defun make-structure-class-defstruct-form (name direct-slots include) - (let* ((conc-name (intern (format nil "~S structure class " name))) - (constructor (intern (format nil "~A constructor" conc-name))) + (let* ((conc-name (format-symbol *package* "~S structure class " name)) + (constructor (format-symbol *package* "~Aconstructor" conc-name)) (defstruct `(defstruct (,name ,@(when include `((:include ,(class-name include)))) - (:print-function print-std-instance) (:predicate nil) (:conc-name ,conc-name) (:constructor ,constructor ()) @@ -497,18 +610,14 @@ +slot-unbound+)) direct-slots))) (reader-names (mapcar (lambda (slotd) - (intern (format nil - "~A~A reader" - conc-name - (slot-definition-name - slotd)))) + (list 'slot-accessor name + (slot-definition-name slotd) + 'reader)) direct-slots)) (writer-names (mapcar (lambda (slotd) - (intern (format nil - "~A~A writer" - conc-name - (slot-definition-name - slotd)))) + (list 'slot-accessor name + (slot-definition-name slotd) + 'writer)) direct-slots)) (readers-init (mapcar (lambda (slotd reader-name) @@ -535,13 +644,26 @@ (cons nil nil)))) (values defstruct-form constructor reader-names writer-names))) +(defun make-defstruct-allocation-function (class) + (let ((dd (get-structure-dd (class-name class)))) + (lambda () + (let ((instance (%make-instance (dd-length dd))) + (raw-index (dd-raw-index dd))) + (setf (%instance-layout instance) + (sb-kernel::compiler-layout-or-lose (dd-name dd))) + (when raw-index + (setf (%instance-ref instance raw-index) + (make-array (dd-raw-length dd) + :element-type '(unsigned-byte 32)))) + instance)))) + (defmethod shared-initialize :after - ((class structure-class) - slot-names - &key (direct-superclasses nil direct-superclasses-p) - (direct-slots nil direct-slots-p) - direct-default-initargs - (predicate-name nil predicate-name-p)) + ((class structure-class) + slot-names + &key (direct-superclasses nil direct-superclasses-p) + (direct-slots nil direct-slots-p) + direct-default-initargs + (predicate-name nil predicate-name-p)) (declare (ignore slot-names direct-default-initargs)) (if direct-superclasses-p (setf (slot-value class 'direct-superclasses) @@ -559,39 +681,42 @@ (mapcar (lambda (pl) (when defstruct-p (let* ((slot-name (getf pl :name)) - (acc-name - (format nil - "~S structure class ~A" - name slot-name)) - (accessor (intern acc-name))) + (accessor + (format-symbol *package* + "~S structure class ~A" + name slot-name))) (setq pl (list* :defstruct-accessor-symbol accessor pl)))) (make-direct-slotd class pl)) direct-slots))) (setq direct-slots (slot-value class 'direct-slots))) - (when defstruct-p - (let ((include (car (slot-value class 'direct-superclasses)))) - (multiple-value-bind (defstruct-form constructor reader-names writer-names) - (make-structure-class-defstruct-form name direct-slots include) - (unless (structure-type-p name) (eval defstruct-form)) - (mapc (lambda (dslotd reader-name writer-name) - (let* ((reader (gdefinition reader-name)) - (writer (when (gboundp writer-name) - (gdefinition writer-name)))) - (setf (slot-value dslotd 'internal-reader-function) - reader) - (setf (slot-value dslotd 'internal-writer-function) - writer))) - direct-slots reader-names writer-names) - (setf (slot-value class 'defstruct-form) defstruct-form) - (setf (slot-value class 'defstruct-constructor) constructor)))) + (if defstruct-p + (let ((include (car (slot-value class 'direct-superclasses)))) + (multiple-value-bind (defstruct-form constructor reader-names writer-names) + (make-structure-class-defstruct-form name direct-slots include) + (unless (structure-type-p name) (eval defstruct-form)) + (mapc (lambda (dslotd reader-name writer-name) + (let* ((reader (gdefinition reader-name)) + (writer (when (gboundp writer-name) + (gdefinition writer-name)))) + (setf (slot-value dslotd 'internal-reader-function) + reader) + (setf (slot-value dslotd 'internal-writer-function) + writer))) + direct-slots reader-names writer-names) + (setf (slot-value class 'defstruct-form) defstruct-form) + (setf (slot-value class 'defstruct-constructor) constructor))) + (setf (slot-value class 'defstruct-constructor) + (make-defstruct-allocation-function class))) (add-direct-subclasses class direct-superclasses) (setf (slot-value class 'class-precedence-list) - (compute-class-precedence-list class)) + (compute-class-precedence-list class)) + (setf (slot-value class 'cpl-available-p) t) (setf (slot-value class 'slots) (compute-slots class)) - (let ((lclass (cl:find-class (class-name class)))) - (setf (sb-kernel:class-pcl-class lclass) class) - (setf (slot-value class 'wrapper) (sb-kernel:class-layout lclass))) + (let ((lclass (find-classoid (class-name class)))) + (setf (classoid-pcl-class lclass) class) + (setf (slot-value class 'wrapper) (classoid-layout lclass))) + (setf (slot-value class 'finalized-p) t) (update-pv-table-cache-info class) (setq predicate-name (if predicate-name-p (setf (slot-value class 'predicate-name) @@ -602,8 +727,8 @@ (class-name class)))))) (make-class-predicate class predicate-name) (add-slot-accessors class direct-slots))) - -(defmethod direct-slot-definition-class ((class structure-class) initargs) + +(defmethod direct-slot-definition-class ((class structure-class) &rest initargs) (declare (ignore initargs)) (find-class 'structure-direct-slot-definition)) @@ -618,31 +743,50 @@ (defun fix-slot-accessors (class dslotds add/remove) (flet ((fix (gfspec name r/w) - (let ((gf (ensure-generic-function gfspec))) - (case r/w - (r (if (eq add/remove 'add) - (add-reader-method class gf name) - (remove-reader-method class gf))) - (w (if (eq add/remove 'add) - (add-writer-method class gf name) - (remove-writer-method class gf))))))) + (let ((gf (if (fboundp gfspec) + (without-package-locks + (ensure-generic-function gfspec)) + (ensure-generic-function + gfspec :lambda-list (case r/w + (r '(object)) + (w '(new-value object))))))) + (case r/w + (r (if (eq add/remove 'add) + (add-reader-method class gf name) + (remove-reader-method class gf))) + (w (if (eq add/remove 'add) + (add-writer-method class gf name) + (remove-writer-method class gf))))))) (dolist (dslotd dslotds) (let ((slot-name (slot-definition-name dslotd))) - (dolist (r (slot-definition-readers dslotd)) (fix r slot-name 'r)) - (dolist (w (slot-definition-writers dslotd)) (fix w slot-name 'w)))))) + (dolist (r (slot-definition-readers dslotd)) + (fix r slot-name 'r)) + (dolist (w (slot-definition-writers dslotd)) + (fix w slot-name 'w)))))) -(defun add-direct-subclasses (class new) - (dolist (n new) +(defun add-direct-subclasses (class supers) + (dolist (super supers) (unless (memq class (class-direct-subclasses class)) - (add-direct-subclass n class)))) + (add-direct-subclass super class)))) -(defun remove-direct-subclasses (class new) +(defun remove-direct-subclasses (class supers) (let ((old (class-direct-superclasses class))) - (dolist (o (set-difference old new)) + (dolist (o (set-difference old supers)) (remove-direct-subclass o class)))) (defmethod finalize-inheritance ((class std-class)) (update-class class t)) + +(defmethod finalize-inheritance ((class forward-referenced-class)) + ;; FIXME: should we not be thinking a bit about what kinds of error + ;; we're throwing? Maybe we need a clos-error type to mix in? Or + ;; possibly a forward-referenced-class-error, though that's + ;; difficult given e.g. class precedence list calculations... + (error + "~@" + class)) + (defun class-has-a-forward-referenced-superclass-p (class) (or (forward-referenced-class-p class) @@ -652,25 +796,49 @@ ;;; This is called by :after shared-initialize whenever a class is initialized ;;; or reinitialized. The class may or may not be finalized. (defun update-class (class finalizep) - (when (or finalizep (class-finalized-p class) - (not (class-has-a-forward-referenced-superclass-p class))) - (update-cpl class (compute-class-precedence-list class)) - (update-slots class (compute-slots class)) - (update-gfs-of-class class) - (update-inits class (compute-default-initargs class)) - (update-make-instance-function-table class)) - (unless finalizep - (dolist (sub (class-direct-subclasses class)) (update-class sub nil)))) + ;; Comment from Gerd Moellmann: + ;; + ;; Note that we can't simply delay the finalization when CLASS has + ;; no forward referenced superclasses because that causes bootstrap + ;; problems. + (without-package-locks + (when (and (not finalizep) + (not (class-finalized-p class)) + (not (class-has-a-forward-referenced-superclass-p class))) + (finalize-inheritance class) + (return-from update-class)) + (when (or finalizep (class-finalized-p class) + (not (class-has-a-forward-referenced-superclass-p class))) + (setf (find-class (class-name class)) class) + (update-cpl class (compute-class-precedence-list class)) + ;; This invocation of UPDATE-SLOTS, in practice, finalizes the + ;; class. The hoops above are to ensure that FINALIZE-INHERITANCE + ;; is called at finalization, so that MOP programmers can hook + ;; into the system as described in "Class Finalization Protocol" + ;; (section 5.5.2 of AMOP). + (update-slots class (compute-slots class)) + (update-gfs-of-class class) + (update-initargs class (compute-default-initargs class)) + (update-ctors 'finalize-inheritance :class class)) + (unless finalizep + (dolist (sub (class-direct-subclasses class)) (update-class sub nil))))) (defun update-cpl (class cpl) (if (class-finalized-p class) - (unless (equal (class-precedence-list class) cpl) + (unless (and (equal (class-precedence-list class) cpl) + (dolist (c cpl t) + (when (position :class (class-direct-slots c) + :key #'slot-definition-allocation) + (return nil)))) ;; comment from the old CMU CL sources: ;; Need to have the cpl setup before update-lisp-class-layout ;; is called on CMU CL. (setf (slot-value class 'class-precedence-list) cpl) + (setf (slot-value class 'cpl-available-p) t) (force-cache-flushes class)) - (setf (slot-value class 'class-precedence-list) cpl)) + (progn + (setf (slot-value class 'class-precedence-list) cpl) + (setf (slot-value class 'cpl-available-p) t))) (update-class-can-precede-p cpl)) (defun update-class-can-precede-p (cpl) @@ -688,8 +856,9 @@ (class-slots ())) (dolist (eslotd eslotds) (let ((alloc (slot-definition-allocation eslotd))) - (cond ((eq alloc :instance) (push eslotd instance-slots)) - ((classp alloc) (push eslotd class-slots))))) + (case alloc + (:instance (push eslotd instance-slots)) + (:class (push eslotd class-slots))))) ;; If there is a change in the shape of the instances then the ;; old class is now obsolete. @@ -698,8 +867,10 @@ :key #'slot-definition-location))) (nslots (length nlayout)) (nwrapper-class-slots (compute-class-slots class-slots)) - (owrapper (class-wrapper class)) - (olayout (and owrapper (wrapper-instance-slots-layout owrapper))) + (owrapper (when (class-finalized-p class) + (class-wrapper class))) + (olayout (when owrapper + (wrapper-instance-slots-layout owrapper))) (owrapper-class-slots (and owrapper (wrapper-class-slots owrapper))) (nwrapper (cond ((null owrapper) @@ -726,39 +897,19 @@ (wrapper-class-slots nwrapper) nwrapper-class-slots (wrapper-no-of-instance-slots nwrapper) nslots wrapper nwrapper)) - + (setf (slot-value class 'finalized-p) t) (unless (eq owrapper nwrapper) - (update-pv-table-cache-info class))))) + (update-pv-table-cache-info class) + (maybe-update-standard-class-locations class))))) (defun compute-class-slots (eslotds) (let (collect) (dolist (eslotd eslotds) (push (assoc (slot-definition-name eslotd) - (class-slot-cells (slot-definition-allocation eslotd))) + (class-slot-cells (slot-definition-class eslotd))) collect)) (nreverse collect))) -(defun compute-layout (cpl instance-eslotds) - (let* ((names - (let (collect) - (dolist (eslotd instance-eslotds) - (when (eq (slot-definition-allocation eslotd) :instance) - (push (slot-definition-name eslotd) collect))) - (nreverse collect))) - (order ())) - (labels ((rwalk (tail) - (when tail - (rwalk (cdr tail)) - (dolist (ss (class-slots (car tail))) - (let ((n (slot-definition-name ss))) - (when (member n names) - (setq order (cons n order) - names (remove n names)))))))) - (rwalk (if (slot-boundp (car cpl) 'slots) - cpl - (cdr cpl))) - (reverse (append names order))))) - (defun update-gfs-of-class (class) (when (and (class-finalized-p class) (let ((cpl (class-precedence-list class))) @@ -776,33 +927,24 @@ (update-gf-dfun class gf)) gf-table))))) -(defun update-inits (class inits) +(defun update-initargs (class inits) (setf (plist-value class 'default-initargs) inits)) (defmethod compute-default-initargs ((class slot-class)) - (let ((cpl (class-precedence-list class)) - (direct (class-direct-default-initargs class))) - (labels ((walk (tail) - (if (null tail) - nil - (let ((c (pop tail))) - (append (if (eq c class) - direct - (class-direct-default-initargs c)) - (walk tail)))))) - (let ((initargs (walk cpl))) - (delete-duplicates initargs :test #'eq :key #'car :from-end t))))) + (let ((initargs (loop for c in (class-precedence-list class) + append (class-direct-default-initargs c)))) + (delete-duplicates initargs :test #'eq :key #'car :from-end t))) ;;;; protocols for constructing direct and effective slot definitions -(defmethod direct-slot-definition-class ((class std-class) initargs) +(defmethod direct-slot-definition-class ((class std-class) &rest initargs) (declare (ignore initargs)) (find-class 'standard-direct-slot-definition)) (defun make-direct-slotd (class initargs) (let ((initargs (list* :class class initargs))) (apply #'make-instance - (direct-slot-definition-class class initargs) + (apply #'direct-slot-definition-class class initargs) initargs))) (defmethod compute-slots ((class std-class)) @@ -812,43 +954,112 @@ ;; The list is in most-specific-first order. (let ((name-dslotds-alist ())) (dolist (c (class-precedence-list class)) - (let ((dslotds (class-direct-slots c))) - (dolist (d dslotds) - (let* ((name (slot-definition-name d)) - (entry (assq name name-dslotds-alist))) - (if entry - (push d (cdr entry)) - (push (list name d) name-dslotds-alist)))))) + (dolist (slot (class-direct-slots c)) + (let* ((name (slot-definition-name slot)) + (entry (assq name name-dslotds-alist))) + (if entry + (push slot (cdr entry)) + (push (list name slot) name-dslotds-alist))))) (mapcar (lambda (direct) (compute-effective-slot-definition class + (car direct) (nreverse (cdr direct)))) name-dslotds-alist))) -(defmethod compute-slots :around ((class std-class)) +(defmethod compute-slots ((class standard-class)) + (call-next-method)) + +(defmethod compute-slots :around ((class standard-class)) (let ((eslotds (call-next-method)) - (cpl (class-precedence-list class)) - (instance-slots ()) - (class-slots ())) - (dolist (eslotd eslotds) - (let ((alloc (slot-definition-allocation eslotd))) - (cond ((eq alloc :instance) (push eslotd instance-slots)) - ((classp alloc) (push eslotd class-slots))))) - (let ((nlayout (compute-layout cpl instance-slots))) - (dolist (eslotd instance-slots) - (setf (slot-definition-location eslotd) - (position (slot-definition-name eslotd) nlayout)))) - (dolist (eslotd class-slots) + (location -1)) + (dolist (eslotd eslotds eslotds) (setf (slot-definition-location eslotd) - (assoc (slot-definition-name eslotd) - (class-slot-cells (slot-definition-allocation eslotd))))) - (mapc #'initialize-internal-slot-functions eslotds) - eslotds)) + (case (slot-definition-allocation eslotd) + (:instance + (incf location)) + (:class + (let* ((name (slot-definition-name eslotd)) + (from-class + (or + (slot-definition-allocation-class eslotd) + ;; we get here if the user adds an extra slot + ;; himself... + (setf (slot-definition-allocation-class eslotd) + class))) + ;; which raises the question of what we should + ;; do if we find that said user has added a slot + ;; with the same name as another slot... + (cell (or (assq name (class-slot-cells from-class)) + (setf (class-slot-cells from-class) + (cons (cons name +slot-unbound+) + (class-slot-cells from-class)))))) + (aver (consp cell)) + (if (eq +slot-unbound+ (cdr cell)) + ;; We may have inherited an initfunction + (let ((initfun (slot-definition-initfunction eslotd))) + (if initfun + (rplacd cell (funcall initfun)) + cell)) + cell))))) + (unless (slot-definition-class eslotd) + (setf (slot-definition-class eslotd) class)) + (initialize-internal-slot-functions eslotd)))) + +(defmethod compute-slots ((class funcallable-standard-class)) + (call-next-method)) + +(defmethod compute-slots :around ((class funcallable-standard-class)) + (labels ((instance-slot-names (slotds) + (let (collect) + (dolist (slotd slotds (nreverse collect)) + (when (eq (slot-definition-allocation slotd) :instance) + (push (slot-definition-name slotd) collect))))) + ;; This sorts slots so that slots of classes later in the CPL + ;; come before slots of other classes. This is crucial for + ;; funcallable instances because it ensures that the slots of + ;; FUNCALLABLE-STANDARD-OBJECT, which includes the slots of + ;; KERNEL:FUNCALLABLE-INSTANCE, come first, which in turn + ;; makes it possible to treat FUNCALLABLE-STANDARD-OBJECT as + ;; a funcallable instance. + (compute-layout (eslotds) + (let ((first ()) + (names (instance-slot-names eslotds))) + (dolist (class + (reverse (class-precedence-list class)) + (nreverse (nconc names first))) + (dolist (ss (class-slots class)) + (let ((name (slot-definition-name ss))) + (when (member name names) + (push name first) + (setq names (delete name names))))))))) + (let ((all-slotds (call-next-method)) + (instance-slots ()) + (class-slots ())) + (dolist (slotd all-slotds) + (case (slot-definition-allocation slotd) + (:instance (push slotd instance-slots)) + (:class (push slotd class-slots)))) + (let ((layout (compute-layout instance-slots))) + (dolist (slotd instance-slots) + (setf (slot-definition-location slotd) + (position (slot-definition-name slotd) layout)) + (initialize-internal-slot-functions slotd))) + (dolist (slotd class-slots) + (let ((name (slot-definition-name slotd)) + (from-class (slot-definition-allocation-class slotd))) + (setf (slot-definition-location slotd) + (assoc name (class-slot-cells from-class))) + (aver (consp (slot-definition-location slotd))) + (initialize-internal-slot-functions slotd))) + all-slotds))) (defmethod compute-slots ((class structure-class)) (mapcan (lambda (superclass) (mapcar (lambda (dslotd) - (compute-effective-slot-definition class - (list dslotd))) + (compute-effective-slot-definition + class + (slot-definition-name dslotd) + (list dslotd))) (class-direct-slots superclass))) (reverse (slot-value class 'class-precedence-list)))) @@ -857,16 +1068,17 @@ (mapc #'initialize-internal-slot-functions eslotds) eslotds)) -(defmethod compute-effective-slot-definition ((class slot-class) dslotds) +(defmethod compute-effective-slot-definition ((class slot-class) name dslotds) + (declare (ignore name)) (let* ((initargs (compute-effective-slot-definition-initargs class dslotds)) - (class (effective-slot-definition-class class initargs))) + (class (apply #'effective-slot-definition-class class initargs))) (apply #'make-instance class initargs))) -(defmethod effective-slot-definition-class ((class std-class) initargs) +(defmethod effective-slot-definition-class ((class std-class) &rest initargs) (declare (ignore initargs)) (find-class 'standard-effective-slot-definition)) -(defmethod effective-slot-definition-class ((class structure-class) initargs) +(defmethod effective-slot-definition-class ((class structure-class) &rest initargs) (declare (ignore initargs)) (find-class 'structure-effective-slot-definition)) @@ -877,6 +1089,7 @@ (initform nil) (initargs nil) (allocation nil) + (allocation-class nil) (type t) (namep nil) (initp nil) @@ -894,6 +1107,7 @@ initp t))) (unless allocp (setq allocation (slot-definition-allocation slotd) + allocation-class (slot-definition-class slotd) allocp t)) (setq initargs (append (slot-definition-initargs slotd) initargs)) (let ((slotd-type (slot-definition-type slotd))) @@ -905,6 +1119,7 @@ :initfunction initfunction :initargs initargs :allocation allocation + :allocation-class allocation-class :type type :class class))) @@ -973,18 +1188,17 @@ (let ((method (get-method generic-function () (list class) nil))) (when method (remove-method generic-function method)))) -;;; make-reader-method-function and make-write-method function are NOT part of -;;; the standard protocol. They are however useful, PCL makes uses makes use -;;; of them internally and documents them for PCL users. +;;; MAKE-READER-METHOD-FUNCTION and MAKE-WRITE-METHOD function are NOT +;;; part of the standard protocol. They are however useful, PCL makes +;;; use of them internally and documents them for PCL users. ;;; ;;; *** This needs work to make type testing by the writer functions which ;;; *** do type testing faster. The idea would be to have one constructor -;;; *** for each possible type test. In order to do this it would be nice -;;; *** to have help from inform-type-system-about-class and friends. +;;; *** for each possible type test. ;;; ;;; *** There is a subtle bug here which is going to have to be fixed. ;;; *** Namely, the simplistic use of the template has to be fixed. We -;;; *** have to give the optimize-slot-value method the user might have +;;; *** have to give the OPTIMIZE-SLOT-VALUE method the user might have ;;; *** defined for this metaclass a chance to run. (defmethod make-reader-method-function ((class slot-class) slot-name) @@ -996,20 +1210,6 @@ (defmethod make-boundp-method-function ((class slot-class) slot-name) (make-std-boundp-method-function (class-name class) slot-name)) -;;;; inform-type-system-about-class -;;; -;;; These are NOT part of the standard protocol. They are internal -;;; mechanism which PCL uses to *try* and tell the type system about -;;; class definitions. In a more fully integrated implementation of -;;; CLOS, the type system would know about class objects and class -;;; names in a more fundamental way and the mechanism used to inform -;;; the type system about new classes would be different. -(defmethod inform-type-system-about-class ((class std-class) name) - (inform-type-system-about-std-class name)) - -(defmethod inform-type-system-about-class ((class structure-class) (name t)) - nil) - (defmethod compatible-meta-class-change-p (class proto-new-class) (eq (class-of class) (class-of proto-new-class))) @@ -1022,33 +1222,63 @@ (or (eq new-super-meta-class *the-class-std-class*) (eq (class-of class) new-super-meta-class)))) +;;; What this does depends on which of the four possible values of +;;; LAYOUT-INVALID the PCL wrapper has; the simplest case is when it +;;; is (:FLUSH ) or (:OBSOLETE ), when there is +;;; nothing to do, as the new wrapper has already been created. If +;;; LAYOUT-INVALID returns NIL, then we invalidate it (setting it to +;;; (:FLUSH ); UPDATE-SLOTS later gets to choose whether or +;;; not to "upgrade" this to (:OBSOLETE ). +;;; +;;; This leaves the case where LAYOUT-INVALID returns T, which happens +;;; when REGISTER-LAYOUT has invalidated a superclass of CLASS (which +;;; invalidated all the subclasses in SB-KERNEL land). Again, here we +;;; must flush the caches and allow UPDATE-SLOTS to decide whether to +;;; obsolete the wrapper. +;;; +;;; FIXME: either here or in INVALID-WRAPPER-P looks like a good place +;;; for (AVER (NOT (EQ (LAYOUT-INVALID OWRAPPER) +;;; :UNINITIALIZED))) +;;; +;;; Thanks to Gerd Moellmann for the explanation. -- CSR, 2002-10-29 (defun force-cache-flushes (class) - (let* ((owrapper (class-wrapper class)) - (state (wrapper-state owrapper))) - ;; We only need to do something if the state is still T. If the - ;; state isn't T, it will be FLUSH or OBSOLETE, and both of those - ;; will already be doing what we want. In particular, we must be - ;; sure we never change an OBSOLETE into a FLUSH since OBSOLETE - ;; means do what FLUSH does and then some. - (when (eq state t) ; FIXME: should be done through INVALID-WRAPPER-P + (let* ((owrapper (class-wrapper class))) + ;; We only need to do something if the wrapper is still valid. If + ;; the wrapper isn't valid, state will be FLUSH or OBSOLETE, and + ;; both of those will already be doing what we want. In + ;; particular, we must be sure we never change an OBSOLETE into a + ;; FLUSH since OBSOLETE means do what FLUSH does and then some. + (when (or (not (invalid-wrapper-p owrapper)) + ;; KLUDGE: despite the observations above, this remains + ;; a violation of locality or what might be considered + ;; good style. There has to be a better way! -- CSR, + ;; 2002-10-29 + (eq (layout-invalid owrapper) t)) (let ((nwrapper (make-wrapper (wrapper-no-of-instance-slots owrapper) class))) (setf (wrapper-instance-slots-layout nwrapper) (wrapper-instance-slots-layout owrapper)) (setf (wrapper-class-slots nwrapper) (wrapper-class-slots owrapper)) - (sb-sys:without-interrupts + (with-pcl-lock (update-lisp-class-layout class nwrapper) (setf (slot-value class 'wrapper) nwrapper) - (invalidate-wrapper owrapper :flush nwrapper)))))) + ;; Use :OBSOLETE instead of :FLUSH if any superclass has + ;; been obsoleted. + (if (find-if (lambda (x) + (and (consp x) (eq :obsolete (car x)))) + (layout-inherits owrapper) + :key #'layout-invalid) + (invalidate-wrapper owrapper :obsolete nwrapper) + (invalidate-wrapper owrapper :flush nwrapper))))))) (defun flush-cache-trap (owrapper nwrapper instance) (declare (ignore owrapper)) (set-wrapper instance nwrapper)) -;;; make-instances-obsolete can be called by user code. It will cause the -;;; next access to the instance (as defined in 88-002R) to trap through the -;;; update-instance-for-redefined-class mechanism. +;;; MAKE-INSTANCES-OBSOLETE can be called by user code. It will cause +;;; the next access to the instance (as defined in 88-002R) to trap +;;; through the UPDATE-INSTANCE-FOR-REDEFINED-CLASS mechanism. (defmethod make-instances-obsolete ((class std-class)) (let* ((owrapper (class-wrapper class)) (nwrapper (make-wrapper (wrapper-no-of-instance-slots owrapper) @@ -1057,17 +1287,19 @@ (wrapper-instance-slots-layout owrapper)) (setf (wrapper-class-slots nwrapper) (wrapper-class-slots owrapper)) - (sb-sys:without-interrupts + (with-pcl-lock (update-lisp-class-layout class nwrapper) (setf (slot-value class 'wrapper) nwrapper) (invalidate-wrapper owrapper :obsolete nwrapper) class))) (defmethod make-instances-obsolete ((class symbol)) - (make-instances-obsolete (find-class class))) + (make-instances-obsolete (find-class class)) + ;; ANSI wants the class name when called with a symbol. + class) -;;; obsolete-instance-trap is the internal trap that is called when we see -;;; an obsolete instance. The times when it is called are: +;;; OBSOLETE-INSTANCE-TRAP is the internal trap that is called when we +;;; see an obsolete instance. The times when it is called are: ;;; - when the instance is involved in method lookup ;;; - when attempting to access a slot of an instance ;;; @@ -1085,12 +1317,13 @@ ;;; sure that the traps are only happening when they should, and that ;;; the trap methods are computing appropriate new wrappers. -;;; obsolete-instance-trap might be called on structure instances -;;; after a structure is redefined. In most cases, obsolete-instance-trap -;;; will not be able to fix the old instance, so it must signal an -;;; error. The hard part of this is that the error system and debugger -;;; might cause obsolete-instance-trap to be called again, so in that -;;; case, we have to return some reasonable wrapper, instead. +;;; OBSOLETE-INSTANCE-TRAP might be called on structure instances +;;; after a structure is redefined. In most cases, +;;; OBSOLETE-INSTANCE-TRAP will not be able to fix the old instance, +;;; so it must signal an error. The hard part of this is that the +;;; error system and debugger might cause OBSOLETE-INSTANCE-TRAP to be +;;; called again, so in that case, we have to return some reasonable +;;; wrapper, instead. (defvar *in-obsolete-instance-trap* nil) (defvar *the-wrapper-of-structure-object* @@ -1121,15 +1354,25 @@ (added ()) (discarded ()) (plist ())) - ;; local --> local transfer - ;; local --> shared discard - ;; local --> -- discard - ;; shared --> local transfer - ;; shared --> shared discard - ;; shared --> -- discard - ;; -- --> local add + + ;; local --> local transfer value + ;; local --> shared discard value, discard slot + ;; local --> -- discard slot + ;; shared --> local transfer value + ;; shared --> shared -- (cf SHARED-INITIALIZE :AFTER STD-CLASS) + ;; shared --> -- discard value + ;; -- --> local add slot ;; -- --> shared -- + ;; Collect class slots from inherited wrappers. Needed for + ;; shared -> local transfers of inherited slots. + (let ((inherited (layout-inherits owrapper))) + (loop for i from (1- (length inherited)) downto 0 + for layout = (aref inherited i) + when (typep layout 'wrapper) + do (dolist (slot (wrapper-class-slots layout)) + (pushnew slot oclass-slots :key #'car)))) + ;; Go through all the old local slots. (let ((opos 0)) (dolist (name olayout) @@ -1148,11 +1391,8 @@ (let ((name (car oclass-slot-and-val)) (val (cdr oclass-slot-and-val))) (let ((npos (posq name nlayout))) - (if npos - (setf (clos-slots-ref nslots npos) (cdr oclass-slot-and-val)) - (progn (push name discarded) - (unless (eq val +slot-unbound+) - (setf (getf plist name) val))))))) + (when npos + (setf (clos-slots-ref nslots npos) val))))) ;; Go through all the new local slots to compute the added slots. (dolist (nlocal nlayout) @@ -1168,18 +1408,7 @@ plist) nwrapper))) -(defmacro copy-instance-internal (instance) - `(progn - (let* ((class (class-of instance)) - (copy (allocate-instance class))) - (if (std-instance-p ,instance) - (setf (std-instance-slots ,instance) - (std-instance-slots ,instance)) - (setf (fsc-instance-slots ,instance) - (fsc-instance-slots ,instance))) - copy))) - -(defun change-class-internal (instance new-class) +(defun change-class-internal (instance new-class initargs) (let* ((old-class (class-of instance)) (copy (allocate-instance new-class)) (new-wrapper (get-wrapper copy)) @@ -1198,7 +1427,8 @@ (let ((old-position (posq new-slot old-layout))) (when old-position (setf (clos-slots-ref new-slots new-position) - (clos-slots-ref old-slots old-position)))))) + (clos-slots-ref old-slots old-position)))) + (incf new-position))) ;; "The values of slots specified as shared in the class CFROM and ;; as local in the class CTO are retained." @@ -1211,31 +1441,37 @@ ;; old instance point to the new storage. (swap-wrappers-and-slots instance copy) - (update-instance-for-different-class copy instance) + (apply #'update-instance-for-different-class copy instance initargs) instance)) (defmethod change-class ((instance standard-object) - (new-class standard-class)) - (change-class-internal instance new-class)) + (new-class standard-class) + &rest initargs) + (change-class-internal instance new-class initargs)) (defmethod change-class ((instance funcallable-standard-object) - (new-class funcallable-standard-class)) - (change-class-internal instance new-class)) + (new-class funcallable-standard-class) + &rest initargs) + (change-class-internal instance new-class initargs)) (defmethod change-class ((instance standard-object) - (new-class funcallable-standard-class)) + (new-class funcallable-standard-class) + &rest initargs) + (declare (ignore initargs)) (error "You can't change the class of ~S to ~S~@ because it isn't already an instance with metaclass ~S." instance new-class 'standard-class)) (defmethod change-class ((instance funcallable-standard-object) - (new-class standard-class)) + (new-class standard-class) + &rest initargs) + (declare (ignore initargs)) (error "You can't change the class of ~S to ~S~@ because it isn't already an instance with metaclass ~S." instance new-class 'funcallable-standard-class)) -(defmethod change-class ((instance t) (new-class-name symbol)) - (change-class instance (find-class new-class-name))) +(defmethod change-class ((instance t) (new-class-name symbol) &rest initargs) + (apply #'change-class instance (find-class new-class-name) initargs)) ;;;; The metaclass BUILT-IN-CLASS ;;;; @@ -1260,6 +1496,17 @@ (or (eq s *the-class-t*) (eq s *the-class-stream*))) +;;; Some necessary methods for FORWARD-REFERENCED-CLASS +(defmethod class-direct-slots ((class forward-referenced-class)) ()) +(defmethod class-direct-default-initargs ((class forward-referenced-class)) ()) +(macrolet ((def (method) + `(defmethod ,method ((class forward-referenced-class)) + (error "~@<~I~S was called on a forward referenced class:~2I~_~S~:>" + ',method class)))) + (def class-default-initargs) + (def class-precedence-list) + (def class-slots)) + (defmethod validate-superclass ((c slot-class) (f forward-referenced-class)) t)