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;;;; This software is part of the SBCL system. See the README file for
;;;; more information.
;;;; This software is derived from software originally released by Xerox
;;;; Corporation. Copyright and release statements follow. Later modifications
;;;; to the software are in the public domain and are provided with
;;;; absolutely no warranty. See the COPYING and CREDITS files for more
;;;; information.
;;;; copyright information from original PCL sources:
;;;;
;;;; Copyright (c) 1985, 1986, 1987, 1988, 1989, 1990 Xerox Corporation.
;;;; All rights reserved.
;;;;
;;;; Use and copying of this software and preparation of derivative works based
;;;; upon this software are permitted. Any distribution of this software or
;;;; derivative works must comply with all applicable United States export
;;;; control laws.
;;;;
;;;; This software is made available AS IS, and Xerox Corporation makes no
;;;; warranty about the software, its performance or its conformity to any
;;;; specification.
(in-package "SB-PCL")
;;;; ANSI CL condition for unbound slots
(define-condition unbound-slot (cell-error)
((instance :reader unbound-slot-instance :initarg :instance))
(:report (lambda (condition stream)
(format stream "The slot ~S is unbound in the object ~S."
(cell-error-name condition)
(unbound-slot-instance condition)))))
(defmethod wrapper-fetcher ((class standard-class))
'std-instance-wrapper)
(defmethod slots-fetcher ((class standard-class))
'std-instance-slots)
(defmethod raw-instance-allocator ((class standard-class))
'allocate-standard-instance)
;;; These four 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))
(t
(error "unrecognized instance type"))))
(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 find-slot-definition (class slot-name)
(dolist (slot (class-slots class) nil)
(when (eql slot-name (slot-definition-name slot))
(return slot))))
(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 (eval slot-name)))
`(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 (eval slot-name)))
`(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 (eval slot-name)))
`(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))
(defun slot-exists-p (object slot-name)
(let ((class (class-of object)))
(not (null (find-slot-definition class slot-name)))))
;;; 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"))
(if (slot-boundp object slot-name)
(slot-value object slot-name)
default))
(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 std-object)
(slotd standard-effective-slot-definition))
(check-obsolete-instance object)
(let* ((location (slot-definition-location slotd))
(value
(typecase location
(fixnum
(cond ((std-instance-p object)
(clos-slots-ref (std-instance-slots object)
location))
((fsc-instance-p object)
(clos-slots-ref (fsc-instance-slots object)
location))
(t (bug "unrecognized instance type in ~S"
'slot-value-using-class))))
(cons
(cdr location))
(t
(instance-structure-protocol-error slotd
'slot-value-using-class)))))
(if (eq value +slot-unbound+)
(values (slot-unbound class object (slot-definition-name slotd)))
value)))
(defmethod (setf slot-value-using-class)
(new-value (class std-class)
(object std-object)
(slotd standard-effective-slot-definition))
(check-obsolete-instance object)
(let ((location (slot-definition-location slotd))
(type (slot-definition-type slotd)))
(flet ((check (new-value type)
(cond
((eq type t) new-value)
(t (if (typep new-value type)
new-value
(error 'type-error
:datum new-value :expected-type type))))))
(typecase location
(fixnum
(cond ((std-instance-p object)
(setf (clos-slots-ref (std-instance-slots object) location)
(check new-value type)))
((fsc-instance-p object)
(setf (clos-slots-ref (fsc-instance-slots object) location)
(check new-value type)))
(t (bug "unrecognized instance type in ~S"
'(setf slot-value-using-class)))))
(cons
(setf (cdr location) (check new-value type)))
(t
(instance-structure-protocol-error
slotd '(setf slot-value-using-class)))))))
(defmethod slot-boundp-using-class
((class std-class)
(object std-object)
(slotd standard-effective-slot-definition))
(check-obsolete-instance object)
(let* ((location (slot-definition-location slotd))
(value
(typecase location
(fixnum
(cond ((std-instance-p object)
(clos-slots-ref (std-instance-slots object)
location))
((fsc-instance-p object)
(clos-slots-ref (fsc-instance-slots object)
location))
(t (bug "unrecognized instance type in ~S"
'slot-boundp-using-class))))
(cons
(cdr location))
(t
(instance-structure-protocol-error slotd
'slot-boundp-using-class)))))
(not (eq value +slot-unbound+))))
(defmethod slot-makunbound-using-class
((class std-class)
(object std-object)
(slotd standard-effective-slot-definition))
(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)
+slot-unbound+))
((fsc-instance-p object)
(setf (clos-slots-ref (fsc-instance-slots object) location)
+slot-unbound+))
(t (bug "unrecognized instance type in ~S"
'slot-makunbound-using-class))))
(cons
(setf (cdr location) +slot-unbound+))
(t
(instance-structure-protocol-error slotd
'slot-makunbound-using-class))))
object)
(defmethod slot-value-using-class
((class condition-class)
(object condition)
(slotd condition-effective-slot-definition))
(let ((fun (slot-definition-reader-function slotd)))
(declare (type function fun))
(funcall fun object)))
(defmethod (setf slot-value-using-class)
(new-value
(class condition-class)
(object condition)
(slotd condition-effective-slot-definition))
(let ((fun (slot-definition-writer-function slotd)))
(declare (type function fun))
(funcall fun new-value object)))
(defmethod slot-boundp-using-class
((class condition-class)
(object condition)
(slotd condition-effective-slot-definition))
(let ((fun (slot-definition-boundp-function slotd)))
(declare (type function fun))
(funcall fun object)))
(defmethod slot-makunbound-using-class ((class condition-class) object slot)
(error "attempt to unbind slot ~S in condition object ~S."
slot object))
(defmethod slot-value-using-class
((class structure-class)
(object structure-object)
(slotd structure-effective-slot-definition))
(let* ((function (slot-definition-internal-reader-function slotd))
(value (funcall function object)))
(declare (type function function))
(if (eq value +slot-unbound+)
(values (slot-unbound class object (slot-definition-name slotd)))
value)))
(defmethod (setf slot-value-using-class)
(new-value (class structure-class)
(object structure-object)
(slotd structure-effective-slot-definition))
(let ((function (slot-definition-internal-writer-function slotd)))
(declare (type function function))
(funcall function new-value object)))
(defmethod slot-boundp-using-class
((class structure-class)
(object structure-object)
(slotd structure-effective-slot-definition))
t)
(defmethod slot-makunbound-using-class
((class structure-class)
(object structure-object)
(slotd structure-effective-slot-definition))
(error "Structure slots can't be unbound."))
(defmethod slot-missing
((class t) instance slot-name operation &optional new-value)
(error "~@<When attempting to ~A, the slot ~S is missing from the ~
object ~S.~@:>"
(ecase operation
(slot-value "read the slot's value (slot-value)")
(setf (format nil
"set the slot's value to ~S (SETF of SLOT-VALUE)"
new-value))
(slot-boundp "test to see whether slot is bound (SLOT-BOUNDP)")
(slot-makunbound "make the slot unbound (SLOT-MAKUNBOUND)"))
slot-name
instance))
(defmethod slot-unbound ((class t) instance slot-name)
(error 'unbound-slot :name slot-name :instance instance))
(defun slot-unbound-internal (instance position)
(values
(slot-unbound
(class-of instance)
instance
(etypecase position
(fixnum
(nth position (wrapper-instance-slots-layout (wrapper-of instance))))
(cons
(car position))))))
;;; FIXME: AMOP says that allocate-instance imples finalize-inheritance
;;; if the class is not yet finalized, but we don't seem to be taking
;;; care of this for non-standard-classes.x
(defmethod allocate-instance ((class standard-class) &rest initargs)
(declare (ignore initargs))
(unless (class-finalized-p class)
(finalize-inheritance class))
(allocate-standard-instance (class-wrapper class)))
(defmethod allocate-instance ((class structure-class) &rest initargs)
(declare (ignore initargs))
(let ((constructor (class-defstruct-constructor class)))
(if constructor
(funcall constructor)
(allocate-standard-instance (class-wrapper class)))))
;;; FIXME: It would be nicer to have allocate-instance return
;;; uninitialized objects for conditions as well.
(defmethod allocate-instance ((class condition-class) &rest initargs)
(declare (ignore initargs))
(make-condition (class-name class)))
(defmethod allocate-instance ((class built-in-class) &rest initargs)
(declare (ignore initargs))
(error "Cannot allocate an instance of ~S." class)) ; So sayeth AMOP