(remove-duplicates (mapcar #'sb-mop:method-generic-function (sb-mop:specializer-direct-methods specializer))))
(defclass specializable-generic-function (standard-generic-function)
- ((extended-specializers :initform (make-hash-table :test 'equal)
- :reader generic-function-extended-specializers)
- (emf-table :initform (make-hash-table :test 'equal) :reader emf-table))
+ ((emf-table :initform (make-hash-table :test 'equal) :reader emf-table)
+ (cacheingp :initform t :initarg :cacheingp)
+ (single-arg-cacheing-p :initform t :initarg :single-arg-cacheing-p))
(:metaclass sb-mop:funcallable-standard-class)
(:default-initargs :method-class (find-class 'specializable-method)))
-(defclass specializable-method (standard-method)
- ((lambda-expression :initarg :lambda-expression
- :accessor specializable-method-lambda-expression)))
+;;; TODO: we don't use this class yet, but we might do later
+(defclass specializable-method (standard-method) ())
+
+;;; TODO use info?
+(defun extended-specializer-name-p (name)
+ (and (symbolp name)
+ (get name 'extended-specializer-parser)))
+
+(deftype extended-specializer-name ()
+ `(satisfies extended-specializer-name-p))
(defmacro define-extended-specializer (name (gf-var &rest args) &body body)
;; FIXME: unparser
`(setf (get ',name 'extended-specializer-parser)
- (lambda (,gf-var ,@args)
- ,@body)))
+ (lambda (,gf-var ,@args)
+ ,@body)))
;; doesn't work, because we'd have to dump GF into the fasl for the macro
;; expansion
;;; from SBCL:
(defmethod sb-pcl:parse-specializer-using-class
- ((gf specializable-generic-function) name)
- (cond
- ((typep name 'sb-mop:specializer) name)
- ((symbolp name) (find-class name))
- ((consp name)
- (case (car name)
- (eql (sb-mop:intern-eql-specializer (cadr name)))
- (t (make-extended-specializer name))))
- (t (error "unexpected specializer name"))))
+ ((gf specializable-generic-function) (specializer-name t))
+ (if (typep specializer-name '(cons extended-specializer-name))
+ (make-extended-specializer specializer-name)
+ (call-next-method)))
(defmethod sb-pcl:make-method-specializers-form
((gf specializable-generic-function) method snames env)
((gf specializable-generic-function) (g class))
(sb-pcl::class-wrapper g))
+(defun first-arg-only-special-case (gf)
+ (let ((arg-info (sb-pcl::gf-arg-info gf)))
+ (and (slot-value gf 'single-arg-cacheing-p)
+ (>= (sb-pcl::arg-info-number-required arg-info) 1)
+ (every (lambda (x) (eql x t))
+ (cdr (sb-pcl::arg-info-metatypes arg-info))))))
+
;;; FIXME: in some kind of order, the discriminating function needs to handle:
;;; - argument count checking;
;;; - DONE (in effective method) keyword argument validity;
;;; - DONE flushing the emf cache on method addition/removal
;;; - DONE (sort of, using wrappers/g-e-h-k) flushing the cache on class redefinition;
;;; - cache thread-safety.
+;;; - speed
+;;; - DONE (in SBCL itself) interaction with TRACE et al.
(defmethod sb-mop:compute-discriminating-function ((gf specializable-generic-function))
- (lambda (&rest args)
- (let* ((generalizers (mapcar (lambda (x) (generalizer-of-using-class gf x))
- (required-portion gf args)))
- (keys (mapcar (lambda (x) (generalizer-equal-hash-key gf x)) generalizers))
- (emfun (gethash keys (emf-table gf) nil)))
- (if emfun
- (sb-pcl::invoke-emf emfun args)
- (slow-method-lookup gf args generalizers)))))
+ (cond
+ ((not (slot-value gf 'cacheingp))
+ (lambda (&rest args)
+ (let ((generalizers (mapcar (lambda (x) (generalizer-of-using-class gf x))
+ args)))
+ (slow-method-lookup-and-call gf args generalizers))))
+ ((first-arg-only-special-case gf)
+ (lambda (&rest args)
+ (let* ((g (generalizer-of-using-class gf (car args)))
+ (k (generalizer-equal-hash-key gf g))
+ (emfun (gethash k (emf-table gf) nil)))
+ (if emfun
+ (sb-pcl::invoke-emf emfun args)
+ (slow-method-lookup-and-call
+ gf args (cons g (mapcar (lambda (x) (generalizer-of-using-class gf x))
+ (cdr (required-portion gf args)))))))))
+ (t
+ (lambda (&rest args)
+ (let* ((generalizers (mapcar (lambda (x) (generalizer-of-using-class gf x))
+ (required-portion gf args)))
+ (keys (mapcar (lambda (x) (generalizer-equal-hash-key gf x)) generalizers))
+ (emfun (gethash keys (emf-table gf) nil)))
+ (if emfun
+ (sb-pcl::invoke-emf emfun args)
+ (slow-method-lookup-and-call gf args generalizers)))))))
(defmethod reinitialize-instance :after ((gf specializable-generic-function) &key)
(clrhash (emf-table gf)))
(defun slow-method-lookup (gf args generalizers)
- ;; differs from closette
(multiple-value-bind (applicable-methods definitivep)
(compute-applicable-methods-using-generalizers gf generalizers)
- (if definitivep
- (let* ((emfun
- (compute-effective-method-function gf applicable-methods))
- (keys (mapcar (lambda (x) (generalizer-equal-hash-key gf x)) generalizers)))
- (setf (gethash keys (emf-table gf)) emfun)
- (sb-pcl::invoke-emf emfun args))
- (sb-pcl::invoke-emf (compute-effective-method-function
- gf (sb-mop:compute-applicable-methods gf args))
- args))))
+ (unless definitivep
+ (setf applicable-methods (compute-applicable-methods gf args)))
+ (values (compute-effective-method-function gf applicable-methods)
+ definitivep)))
+
+(defun slow-method-lookup-and-call (gf args generalizers)
+ (multiple-value-bind (emf cacheablep)
+ (slow-method-lookup gf args generalizers)
+ (when cacheablep
+ (let ((keys (mapcar (lambda (x) (generalizer-equal-hash-key gf x)) generalizers)))
+ (if (first-arg-only-special-case gf)
+ (setf (gethash (car keys) (emf-table gf)) emf)
+ (setf (gethash keys (emf-table gf)) emf))))
+ (sb-pcl::invoke-emf emf args)))
(defun compute-effective-method-function (gf methods)
- (let* ((mc (sb-mop:generic-function-method-combination gf))
- (sb-pcl::*applicable-methods* methods)
- (em (sb-mop:compute-effective-method gf mc methods)))
- (sb-pcl::make-effective-method-function gf em)))
+ (if (null methods)
+ (lambda (&rest args) (apply #'no-applicable-method gf args))
+ (let* ((mc (sb-mop:generic-function-method-combination gf))
+ (sb-pcl::*applicable-methods* methods)
+ (em (sb-mop:compute-effective-method gf mc methods)))
+ (sb-pcl::make-effective-method-function gf em))))
;; new, not in closette
(defgeneric generalizer-of-using-class (generic-function object))
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