(unless (boundp '*the-class-t*)
(setq *the-class-t* nil))
-(defmacro wrapper-class (wrapper)
- `(classoid-pcl-class (layout-classoid ,wrapper)))
-(defmacro wrapper-no-of-instance-slots (wrapper)
- `(layout-length ,wrapper))
-
-;;; This is called in BRAID when we are making wrappers for classes
-;;; whose slots are not initialized yet, and which may be built-in
-;;; classes. We pass in the class name in addition to the class.
-(defun boot-make-wrapper (length name &optional class)
- (let ((found (find-classoid name nil)))
- (cond
- (found
- (unless (classoid-pcl-class found)
- (setf (classoid-pcl-class found) class))
- (aver (eq (classoid-pcl-class found) class))
- (let ((layout (classoid-layout found)))
- (aver layout)
- layout))
- (t
- (make-wrapper-internal
- :length length
- :classoid (make-standard-classoid
- :name name :pcl-class class))))))
-
-;;; The following variable may be set to a STANDARD-CLASS that has
-;;; already been created by the lisp code and which is to be redefined
-;;; by PCL. This allows STANDARD-CLASSes to be defined and used for
-;;; type testing and dispatch before PCL is loaded.
-(defvar *pcl-class-boot* nil)
-
-;;; In SBCL, as in CMU CL, the layouts (a.k.a wrappers) for built-in
-;;; and structure classes already exist when PCL is initialized, so we
-;;; don't necessarily always make a wrapper. Also, we help maintain
-;;; the mapping between CL:CLASS and SB-KERNEL:CLASSOID objects.
-(defun make-wrapper (length class)
- (cond
- ((or (typep class 'std-class)
- (typep class 'forward-referenced-class))
- (make-wrapper-internal
- :length length
- :classoid
- (let ((owrap (class-wrapper class)))
- (cond (owrap
- (layout-classoid owrap))
- ((or (*subtypep (class-of class) *the-class-standard-class*)
- (*subtypep (class-of class) *the-class-funcallable-standard-class*)
- (typep class 'forward-referenced-class))
- (cond ((and *pcl-class-boot*
- (eq (slot-value class 'name) *pcl-class-boot*))
- (let ((found (find-classoid
- (slot-value class 'name))))
- (unless (classoid-pcl-class found)
- (setf (classoid-pcl-class found) class))
- (aver (eq (classoid-pcl-class found) class))
- found))
- (t
- (let ((name (slot-value class 'name)))
- (make-standard-classoid :pcl-class class
- :name (and (symbolp name) name))))))
- (t
- (bug "Got to T branch in ~S" 'make-wrapper))))))
- (t
- (let* ((found (find-classoid (slot-value class 'name)))
- (layout (classoid-layout found)))
- (unless (classoid-pcl-class found)
- (setf (classoid-pcl-class found) class))
- (aver (eq (classoid-pcl-class found) class))
- (aver layout)
- layout))))
-
(defconstant +first-wrapper-cache-number-index+ 0)
(declaim (inline next-wrapper-cache-number-index))
(defun next-wrapper-cache-number-index (field-number)
(and (< field-number #.(1- wrapper-cache-number-vector-length))
(1+ field-number)))
-
-(declaim (inline wrapper-class*))
-(defun wrapper-class* (wrapper)
- (or (wrapper-class wrapper)
- (ensure-non-standard-class
- (classoid-name (layout-classoid wrapper)))))
-
-;;; The wrapper cache machinery provides general mechanism for
-;;; trapping on the next access to any instance of a given class. This
-;;; mechanism is used to implement the updating of instances when the
-;;; class is redefined (MAKE-INSTANCES-OBSOLETE). The same mechanism
-;;; is also used to update generic function caches when there is a
-;;; change to the superclasses of a class.
-;;;
-;;; Basically, a given wrapper can be valid or invalid. If it is
-;;; invalid, it means that any attempt to do a wrapper cache lookup
-;;; using the wrapper should trap. Also, methods on
-;;; SLOT-VALUE-USING-CLASS check the wrapper validity as well. This is
-;;; done by calling CHECK-WRAPPER-VALIDITY.
-
-(declaim (inline invalid-wrapper-p))
-(defun invalid-wrapper-p (wrapper)
- (not (null (layout-invalid wrapper))))
-
-;;; We only use this inside INVALIDATE-WRAPPER.
-(defvar *previous-nwrappers* (make-hash-table))
-
-;;; We always call this inside WITH-PCL-LOCK.
-(defun invalidate-wrapper (owrapper state nwrapper)
- (aver (member state '(:flush :obsolete) :test #'eq))
- (let ((new-previous ()))
- ;; First off, a previous call to INVALIDATE-WRAPPER may have
- ;; recorded OWRAPPER as an NWRAPPER to update to. Since OWRAPPER
- ;; is about to be invalid, it no longer makes sense to update to
- ;; it.
- ;;
- ;; We go back and change the previously invalidated wrappers so
- ;; that they will now update directly to NWRAPPER. This
- ;; corresponds to a kind of transitivity of wrapper updates.
- (dolist (previous (gethash owrapper *previous-nwrappers*))
- (when (eq state :obsolete)
- (setf (car previous) :obsolete))
- (setf (cadr previous) nwrapper)
- (push previous new-previous))
-
- ;; FIXME: We are here inside PCL lock, but might someone be
- ;; accessing the wrapper at the same time from outside the lock?
- ;; Can it matter that they get 0 from one slot and a valid value
- ;; from another?
- (dotimes (i layout-clos-hash-length)
- (setf (layout-clos-hash owrapper i) 0))
-
- ;; FIXME: We could save a whopping cons by using (STATE . WRAPPER)
- ;; instead
- (push (setf (layout-invalid owrapper) (list state nwrapper))
- new-previous)
-
- (remhash owrapper *previous-nwrappers*)
- (setf (gethash nwrapper *previous-nwrappers*) new-previous)))
-
-(defun check-wrapper-validity (instance)
- (let* ((owrapper (wrapper-of instance))
- (state (layout-invalid owrapper)))
- (aver (not (eq state :uninitialized)))
- (etypecase state
- (null owrapper)
- ;; FIXME: I can't help thinking that, while this does cure the
- ;; symptoms observed from some class redefinitions, this isn't
- ;; the place to be doing this flushing. Nevertheless... --
- ;; CSR, 2003-05-31
- ;;
- ;; CMUCL comment:
- ;; We assume in this case, that the :INVALID is from a
- ;; previous call to REGISTER-LAYOUT for a superclass of
- ;; INSTANCE's class. See also the comment above
- ;; FORCE-CACHE-FLUSHES. Paul Dietz has test cases for this.
- ((member t)
- (force-cache-flushes (class-of instance))
- (check-wrapper-validity instance))
- (cons
- (ecase (car state)
- (:flush
- (flush-cache-trap owrapper (cadr state) instance))
- (:obsolete
- (obsolete-instance-trap owrapper (cadr state) instance)))))))
-
-(declaim (inline check-obsolete-instance))
-(defun check-obsolete-instance (instance)
- (when (invalid-wrapper-p (layout-of instance))
- (check-wrapper-validity instance)))
\f
(defun get-cache (nkeys valuep limit-fn nlines)
(logand mask result)
(1+ (logand mask result)))))
\f
-;;; NIL: means nothing so far, no actual arg info has NILs in the
-;;; metatype
-;;;
-;;; CLASS: seen all sorts of metaclasses (specifically, more than one
-;;; of the next 5 values) or else have seen something which doesn't
-;;; fall into a single category (SLOT-INSTANCE, FORWARD).
-;;;
-;;; T: means everything so far is the class T
-;;; STANDARD-INSTANCE: seen only standard classes
-;;; BUILT-IN-INSTANCE: seen only built in classes
-;;; STRUCTURE-INSTANCE: seen only structure classes
-;;; CONDITION-INSTANCE: seen only condition classes
-(defun raise-metatype (metatype new-specializer)
- (let ((slot (find-class 'slot-class))
- (standard (find-class 'standard-class))
- (fsc (find-class 'funcallable-standard-class))
- (condition (find-class 'condition-class))
- (structure (find-class 'structure-class))
- (built-in (find-class 'built-in-class))
- (frc (find-class 'forward-referenced-class)))
- (flet ((specializer->metatype (x)
- (let ((meta-specializer
- (if (eq *boot-state* 'complete)
- (class-of (specializer-class x))
- (class-of x))))
- (cond
- ((eq x *the-class-t*) t)
- ((*subtypep meta-specializer standard) 'standard-instance)
- ((*subtypep meta-specializer fsc) 'standard-instance)
- ((*subtypep meta-specializer condition) 'condition-instance)
- ((*subtypep meta-specializer structure) 'structure-instance)
- ((*subtypep meta-specializer built-in) 'built-in-instance)
- ((*subtypep meta-specializer slot) 'slot-instance)
- ((*subtypep meta-specializer frc) 'forward)
- (t (error "~@<PCL cannot handle the specializer ~S ~
- (meta-specializer ~S).~@:>"
- new-specializer meta-specializer))))))
- ;; We implement the following table. The notation is
- ;; that X and Y are distinct meta specializer names.
- ;;
- ;; NIL <anything> ===> <anything>
- ;; X X ===> X
- ;; X Y ===> CLASS
- (let ((new-metatype (specializer->metatype new-specializer)))
- (cond ((eq new-metatype 'slot-instance) 'class)
- ((eq new-metatype 'forward) 'class)
- ((null metatype) new-metatype)
- ((eq metatype new-metatype) new-metatype)
- (t 'class))))))
-
-(defmacro with-dfun-wrappers ((args metatypes)
- (dfun-wrappers invalid-wrapper-p
- &optional wrappers classes types)
- invalid-arguments-form
- &body body)
- `(let* ((args-tail ,args) (,invalid-wrapper-p nil) (invalid-arguments-p nil)
- (,dfun-wrappers nil) (dfun-wrappers-tail nil)
- ,@(when wrappers
- `((wrappers-rev nil) (types-rev nil) (classes-rev nil))))
- (dolist (mt ,metatypes)
- (unless args-tail
- (setq invalid-arguments-p t)
- (return nil))
- (let* ((arg (pop args-tail))
- (wrapper nil)
- ,@(when wrappers
- `((class *the-class-t*)
- (type t))))
- (unless (eq mt t)
- (setq wrapper (wrapper-of arg))
- (when (invalid-wrapper-p wrapper)
- (setq ,invalid-wrapper-p t)
- (setq wrapper (check-wrapper-validity arg)))
- (cond ((null ,dfun-wrappers)
- (setq ,dfun-wrappers wrapper))
- ((not (consp ,dfun-wrappers))
- (setq dfun-wrappers-tail (list wrapper))
- (setq ,dfun-wrappers (cons ,dfun-wrappers dfun-wrappers-tail)))
- (t
- (let ((new-dfun-wrappers-tail (list wrapper)))
- (setf (cdr dfun-wrappers-tail) new-dfun-wrappers-tail)
- (setf dfun-wrappers-tail new-dfun-wrappers-tail))))
- ,@(when wrappers
- `((setq class (wrapper-class* wrapper))
- (setq type `(class-eq ,class)))))
- ,@(when wrappers
- `((push wrapper wrappers-rev)
- (push class classes-rev)
- (push type types-rev)))))
- (if invalid-arguments-p
- ,invalid-arguments-form
- (let* (,@(when wrappers
- `((,wrappers (nreverse wrappers-rev))
- (,classes (nreverse classes-rev))
- (,types (mapcar (lambda (class)
- `(class-eq ,class))
- ,classes)))))
- ,@body))))
-\f
-;;;; some support stuff for getting a hold of symbols that we need when
-;;;; building the discriminator codes. It's OK for these to be interned
-;;;; symbols because we don't capture any user code in the scope in which
-;;;; these symbols are bound.
-
-(declaim (list *dfun-arg-symbols*))
-(defvar *dfun-arg-symbols* '(.ARG0. .ARG1. .ARG2. .ARG3.))
-
-(defun dfun-arg-symbol (arg-number)
- (or (nth arg-number *dfun-arg-symbols*)
- (format-symbol *pcl-package* ".ARG~A." arg-number)))
-
-(declaim (list *slot-vector-symbols*))
-(defvar *slot-vector-symbols* '(.SLOTS0. .SLOTS1. .SLOTS2. .SLOTS3.))
-
-(defun slot-vector-symbol (arg-number)
- (or (nth arg-number *slot-vector-symbols*)
- (format-symbol *pcl-package* ".SLOTS~A." arg-number)))
-
-(declaim (inline make-dfun-required-args))
-(defun make-dfun-required-args (metatypes)
- ;; Micro-optimizations 'R Us
- (labels ((rec (types i)
- (declare (fixnum i))
- (when types
- (cons (dfun-arg-symbol i)
- (rec (cdr types) (1+ i))))))
- (rec metatypes 0)))
-
-(defun make-dfun-lambda-list (metatypes applyp)
- (let ((required (make-dfun-required-args metatypes)))
- (if applyp
- (nconc required
- ;; Use &MORE arguments to avoid consing up an &REST list
- ;; that we might not need at all. See MAKE-EMF-CALL and
- ;; INVOKE-EFFECTIVE-METHOD-FUNCTION for the other
- ;; pieces.
- '(&more .dfun-more-context. .dfun-more-count.))
- required)))
-
-(defun make-dlap-lambda-list (metatypes applyp)
- (let* ((required (make-dfun-required-args metatypes))
- (lambda-list (if applyp
- (append required '(&more .more-context. .more-count.))
- required)))
- ;; Return the full lambda list, the required arguments, a form
- ;; that will generate a rest-list, and a list of the &MORE
- ;; parameters used.
- (values lambda-list
- required
- (when applyp
- '((sb-c::%listify-rest-args
- .more-context.
- (the (and unsigned-byte fixnum)
- .more-count.))))
- (when applyp
- '(.more-context. .more-count.)))))
-
-(defun make-emf-call (metatypes applyp fn-variable &optional emf-type)
- (let ((required (make-dfun-required-args metatypes)))
- `(,(if (eq emf-type 'fast-method-call)
- 'invoke-effective-method-function-fast
- 'invoke-effective-method-function)
- ,fn-variable
- ,applyp
- :required-args ,required
- ;; INVOKE-EFFECTIVE-METHOD-FUNCTION will decide whether to use
- ;; the :REST-ARG version or the :MORE-ARG version depending on
- ;; the type of the EMF.
- :rest-arg ,(if applyp
- ;; Creates a list from the &MORE arguments.
- '((sb-c::%listify-rest-args
- .dfun-more-context.
- (the (and unsigned-byte fixnum)
- .dfun-more-count.)))
- nil)
- :more-arg ,(when applyp
- '(.dfun-more-context. .dfun-more-count.)))))
-
-(defun make-fast-method-call-lambda-list (metatypes applyp)
- (list* '.pv-cell. '.next-method-call.
- (make-dfun-lambda-list metatypes applyp)))
-
-\f
(defmacro with-local-cache-functions ((cache) &body body)
`(let ((.cache. ,cache))
(declare (type cache .cache.))