(defmethod raw-instance-allocator ((class standard-class))
'allocate-standard-instance)
-;;; These four functions work on std-instances and fsc-instances. These are
+;;; These three functions work on std-instances and fsc-instances. These are
;;; instances for which it is possible to change the wrapper and the slots.
;;;
;;; For these kinds of instances, most specified methods from the instance
;;; structure protocol are promoted to the implementation-specific class
;;; std-class. Many of these methods call these four functions.
-(defun set-wrapper (inst new)
- (cond ((std-instance-p inst)
- (setf (std-instance-wrapper inst) new))
- ((fsc-instance-p inst)
- (setf (fsc-instance-wrapper inst) new))
+(defun %swap-wrappers-and-slots (i1 i2)
+ (cond ((std-instance-p i1)
+ (let ((w1 (std-instance-wrapper i1))
+ (s1 (std-instance-slots i1)))
+ (setf (std-instance-wrapper i1) (std-instance-wrapper i2))
+ (setf (std-instance-slots i1) (std-instance-slots i2))
+ (setf (std-instance-wrapper i2) w1)
+ (setf (std-instance-slots i2) s1)))
+ ((fsc-instance-p i1)
+ (let ((w1 (fsc-instance-wrapper i1))
+ (s1 (fsc-instance-slots i1)))
+ (setf (fsc-instance-wrapper i1) (fsc-instance-wrapper i2))
+ (setf (fsc-instance-slots i1) (fsc-instance-slots i2))
+ (setf (fsc-instance-wrapper i2) w1)
+ (setf (fsc-instance-slots i2) s1)))
(t
(error "unrecognized instance type"))))
+\f
+;;;; STANDARD-INSTANCE-ACCESS
+
+(declaim (inline standard-instance-access (setf standard-instance-access)
+ funcallable-standard-instance-access
+ (setf funcallable-standard-instance-access)))
+
+(defun standard-instance-access (instance location)
+ (clos-slots-ref (std-instance-slots instance) location))
-(defun swap-wrappers-and-slots (i1 i2)
- (with-pcl-lock ;FIXME is this sufficient?
- (cond ((std-instance-p i1)
- (let ((w1 (std-instance-wrapper i1))
- (s1 (std-instance-slots i1)))
- (setf (std-instance-wrapper i1) (std-instance-wrapper i2))
- (setf (std-instance-slots i1) (std-instance-slots i2))
- (setf (std-instance-wrapper i2) w1)
- (setf (std-instance-slots i2) s1)))
- ((fsc-instance-p i1)
- (let ((w1 (fsc-instance-wrapper i1))
- (s1 (fsc-instance-slots i1)))
- (setf (fsc-instance-wrapper i1) (fsc-instance-wrapper i2))
- (setf (fsc-instance-slots i1) (fsc-instance-slots i2))
- (setf (fsc-instance-wrapper i2) w1)
- (setf (fsc-instance-slots i2) s1)))
- (t
- (error "unrecognized instance type")))))
+(defun (setf standard-instance-access) (new-value instance location)
+ (setf (clos-slots-ref (std-instance-slots instance) location) new-value))
+
+(defun funcallable-standard-instance-access (instance location)
+ (clos-slots-ref (fsc-instance-slots instance) location))
+
+(defun (setf funcallable-standard-instance-access) (new-value instance location)
+ (setf (clos-slots-ref (fsc-instance-slots instance) location) new-value))
\f
-(defun find-slot-definition (class slot-name)
- (dolist (slot (class-slots class) nil)
- (when (eql slot-name (slot-definition-name slot))
- (return slot))))
+;;;; SLOT-VALUE, (SETF SLOT-VALUE), SLOT-BOUNDP, SLOT-MAKUNBOUND
(declaim (ftype (sfunction (t symbol) t) slot-value))
(defun slot-value (object slot-name)
- (let* ((class (class-of object))
- (slot-definition (find-slot-definition class slot-name)))
- (if (null slot-definition)
- (values (slot-missing class object slot-name 'slot-value))
- (slot-value-using-class class object slot-definition))))
-
-(define-compiler-macro slot-value (&whole form object slot-name)
- (if (and (constantp slot-name)
- (interned-symbol-p (constant-form-value slot-name)))
+ (let* ((wrapper (valid-wrapper-of object))
+ (cell (find-slot-cell wrapper slot-name))
+ (location (car cell))
+ (value
+ (cond ((fixnump location)
+ (if (std-instance-p object)
+ (standard-instance-access object location)
+ (funcallable-standard-instance-access object location)))
+ ((consp location)
+ (cdr location))
+ ((not cell)
+ (return-from slot-value
+ (values (slot-missing (wrapper-class* wrapper) object slot-name
+ 'slot-value))))
+ ((not location)
+ (return-from slot-value
+ (slot-value-using-class (wrapper-class* wrapper) object (cddr cell))))
+ (t
+ (bug "Bogus slot cell in SLOT-VALUE: ~S" cell)))))
+ (if (eq +slot-unbound+ value)
+ (slot-unbound (wrapper-class* wrapper) object slot-name)
+ value)))
+
+(define-compiler-macro slot-value (&whole form object slot-name
+ &environment env)
+ (if (and (constantp slot-name env)
+ (interned-symbol-p (constant-form-value slot-name env)))
`(accessor-slot-value ,object ,slot-name)
form))
(defun set-slot-value (object slot-name new-value)
- (let* ((class (class-of object))
- (slot-definition (find-slot-definition class slot-name)))
- (if (null slot-definition)
- (progn (slot-missing class object slot-name 'setf new-value)
- new-value)
- (setf (slot-value-using-class class object slot-definition)
- new-value))))
-
-(define-compiler-macro set-slot-value (&whole form object slot-name new-value)
- (if (and (constantp slot-name)
- (interned-symbol-p (constant-form-value slot-name)))
+ (let* ((wrapper (valid-wrapper-of object))
+ (cell (find-slot-cell wrapper slot-name))
+ (location (car cell))
+ (type-check-function (cadr cell)))
+ (when type-check-function
+ (funcall (the function type-check-function) new-value))
+ (cond ((fixnump location)
+ (if (std-instance-p object)
+ (setf (standard-instance-access object location) new-value)
+ (setf (funcallable-standard-instance-access object location)
+ new-value)))
+ ((consp location)
+ (setf (cdr location) new-value))
+ ((not cell)
+ (slot-missing (wrapper-class* wrapper) object slot-name 'setf new-value))
+ ((not location)
+ (setf (slot-value-using-class (wrapper-class* wrapper) object (cddr cell))
+ new-value))
+ (t
+ (bug "Bogus slot-cell in SET-SLOT-VALUE: ~S" cell))))
+ new-value)
+
+;;; A version of SET-SLOT-VALUE for use in safe code, where we want to
+;;; check types when writing to slots:
+;;; * Doesn't have an optimizing compiler-macro
+;;; * Isn't special-cased in WALK-METHOD-LAMBDA
+(defun safe-set-slot-value (object slot-name new-value)
+ (set-slot-value object slot-name new-value))
+
+(define-compiler-macro set-slot-value (&whole form object slot-name new-value
+ &environment env)
+ (if (and (constantp slot-name env)
+ (interned-symbol-p (constant-form-value slot-name env))
+ ;; We can't use the ACCESSOR-SET-SLOT-VALUE path in safe
+ ;; code, since it'll use the global automatically generated
+ ;; accessor, which won't do typechecking. (SLOT-OBJECT
+ ;; won't have been compiled with SAFETY 3, so SAFE-P will
+ ;; be NIL in MAKE-STD-WRITER-METHOD-FUNCTION).
+ (not (safe-code-p env)))
`(accessor-set-slot-value ,object ,slot-name ,new-value)
form))
(defun slot-boundp (object slot-name)
- (let* ((class (class-of object))
- (slot-definition (find-slot-definition class slot-name)))
- (if (null slot-definition)
- (not (not (slot-missing class object slot-name 'slot-boundp)))
- (slot-boundp-using-class class object slot-definition))))
-
-(setf (gdefinition 'slot-boundp-normal) #'slot-boundp)
-
-(define-compiler-macro slot-boundp (&whole form object slot-name)
- (if (and (constantp slot-name)
- (interned-symbol-p (constant-form-value slot-name)))
+ (let* ((wrapper (valid-wrapper-of object))
+ (cell (find-slot-cell wrapper slot-name))
+ (location (car cell))
+ (value
+ (cond ((fixnump location)
+ (if (std-instance-p object)
+ (standard-instance-access object location)
+ (funcallable-standard-instance-access object location)))
+ ((consp location)
+ (cdr location))
+ ((not cell)
+ (return-from slot-boundp
+ (and (slot-missing (wrapper-class* wrapper) object slot-name
+ 'slot-boundp)
+ t)))
+ ((not location)
+ (return-from slot-boundp
+ (slot-boundp-using-class (wrapper-class* wrapper) object (cddr cell))))
+ (t
+ (bug "Bogus slot cell in SLOT-VALUE: ~S" cell)))))
+ (not (eq +slot-unbound+ value))))
+
+(define-compiler-macro slot-boundp (&whole form object slot-name
+ &environment env)
+ (if (and (constantp slot-name env)
+ (interned-symbol-p (constant-form-value slot-name env)))
`(accessor-slot-boundp ,object ,slot-name)
form))
(defun slot-makunbound (object slot-name)
- (let* ((class (class-of object))
- (slot-definition (find-slot-definition class slot-name)))
- (if (null slot-definition)
- (slot-missing class object slot-name 'slot-makunbound)
- (slot-makunbound-using-class class object slot-definition))
- object))
+ (let* ((wrapper (valid-wrapper-of object))
+ (cell (find-slot-cell wrapper slot-name))
+ (location (car cell)))
+ (cond ((fixnump location)
+ (if (std-instance-p object)
+ (setf (standard-instance-access object location) +slot-unbound+)
+ (setf (funcallable-standard-instance-access object location)
+ +slot-unbound+)))
+ ((consp location)
+ (setf (cdr location) +slot-unbound+))
+ ((not cell)
+ (slot-missing (wrapper-class* wrapper) object slot-name 'slot-makunbound))
+ ((not location)
+ (slot-makunbound-using-class (wrapper-class* wrapper) object (cddr cell)))
+ (t
+ (bug "Bogus slot-cell in SLOT-MAKUNBOUND: ~S" cell))))
+ object)
(defun slot-exists-p (object slot-name)
(let ((class (class-of object)))
(not (null (find-slot-definition class slot-name)))))
+(defvar *unbound-slot-value-marker* (make-unprintable-object "unbound slot"))
+
;;; This isn't documented, but is used within PCL in a number of print
;;; object methods. (See NAMED-OBJECT-PRINT-FUNCTION.)
-(defun slot-value-or-default (object slot-name &optional (default "unbound"))
+(defun slot-value-or-default (object slot-name &optional
+ (default *unbound-slot-value-marker*))
(if (slot-boundp object slot-name)
(slot-value object slot-name)
default))
-\f
-(defun standard-instance-access (instance location)
- (clos-slots-ref (std-instance-slots instance) location))
-
-(defun funcallable-standard-instance-access (instance location)
- (clos-slots-ref (fsc-instance-slots instance) location))
(defmethod slot-value-using-class ((class std-class)
(object standard-object)
(slotd standard-effective-slot-definition))
+ ;; FIXME: Do we need this? SLOT-VALUE checks for obsolete
+ ;; instances. Are users allowed to call this directly?
(check-obsolete-instance object)
(let* ((location (slot-definition-location slotd))
(value
(new-value (class std-class)
(object standard-object)
(slotd standard-effective-slot-definition))
+ ;; FIXME: Do we need this? SET-SLOT-VALUE checks for obsolete
+ ;; instances. Are users allowed to call this directly?
(check-obsolete-instance object)
- (let ((location (slot-definition-location slotd)))
- (typecase location
- (fixnum
- (cond ((std-instance-p object)
- (setf (clos-slots-ref (std-instance-slots object) location)
- new-value))
- ((fsc-instance-p object)
- (setf (clos-slots-ref (fsc-instance-slots object) location)
- new-value))
- (t (bug "unrecognized instance type in ~S"
- '(setf slot-value-using-class)))))
- (cons
- (setf (cdr location) new-value))
- (t
- (instance-structure-protocol-error slotd
- '(setf slot-value-using-class))))))
+ (let ((location (slot-definition-location slotd))
+ (type-check-function
+ (when (safe-p class)
+ (slot-definition-type-check-function slotd))))
+ (flet ((check (new-value)
+ (when type-check-function
+ (funcall (the function type-check-function) new-value))
+ new-value))
+ (typecase location
+ (fixnum
+ (cond ((std-instance-p object)
+ (setf (clos-slots-ref (std-instance-slots object) location)
+ (check new-value)))
+ ((fsc-instance-p object)
+ (setf (clos-slots-ref (fsc-instance-slots object) location)
+ (check new-value)))
+ (t (bug "unrecognized instance type in ~S"
+ '(setf slot-value-using-class)))))
+ (cons
+ (setf (cdr location) (check new-value)))
+ (t
+ (instance-structure-protocol-error
+ slotd '(setf slot-value-using-class)))))))
(defmethod slot-boundp-using-class
((class std-class)
(object standard-object)
(slotd standard-effective-slot-definition))
+ ;; FIXME: Do we need this? SLOT-BOUNDP checks for obsolete
+ ;; instances. Are users allowed to call this directly?
(check-obsolete-instance object)
(let* ((location (slot-definition-location slotd))
(value
(let* ((function (slot-definition-internal-reader-function slotd))
(value (funcall function object)))
(declare (type function function))
+ ;; FIXME: Is this really necessary? Structure slots should surely
+ ;; never be unbound!
(if (eq value +slot-unbound+)
(values (slot-unbound class object (slot-definition-name slotd)))
value)))
(defmethod allocate-instance ((class built-in-class) &rest initargs)
(declare (ignore initargs))
(error "Cannot allocate an instance of ~S." class)) ; So sayeth AMOP
+
+;;; AMOP says that CLASS-SLOTS signals an error for unfinalized classes.
+(defmethod class-slots :before ((class slot-class))
+ (unless (class-finalized-p class)
+ (error 'simple-reference-error
+ :format-control "~S called on ~S, which is not yet finalized."
+ :format-arguments (list 'class-slots class)
+ :references (list '(:amop :generic-function class-slots)))))
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