| -rw-r--r-- | gcl/pcl/slots.lisp | 385 |
diff --git a/gcl/pcl/slots.lisp b/gcl/pcl/slots.lisp new file mode 100644 index 000000000..6cb3c866e --- /dev/null +++ b/gcl/pcl/slots.lisp @@ -0,0 +1,385 @@ +;;;-*-Mode:LISP; Package: PCL; Base:10; Syntax:Common-lisp -*- +;;; +;;; ************************************************************************* +;;; 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. +;;; +;;; Any person obtaining a copy of this software is requested to send their +;;; name and post office or electronic mail address to: +;;; CommonLoops Coordinator +;;; Xerox PARC +;;; 3333 Coyote Hill Rd. +;;; Palo Alto, CA 94304 +;;; (or send Arpanet mail to CommonLoops-Coordinator.pa@Xerox.arpa) +;;; +;;; Suggestions, comments and requests for improvements are also welcome. +;;; ************************************************************************* +;;; + +(in-package :pcl) + +(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) + #+new-kcl-wrapper + (set-structure-def inst new) + #-new-kcl-wrapper + (setf (std-instance-wrapper inst) new)) + ((fsc-instance-p inst) + (setf (fsc-instance-wrapper inst) new)) + (t + (error "What kind of instance is this?")))) + +#+ignore ; can't do this when using #+new-kcl-wrapper +(defun set-slots (inst new) + (cond ((std-instance-p inst) + (setf (std-instance-slots inst) new)) + ((fsc-instance-p inst) + (setf (fsc-instance-slots inst) new)) + (t + (error "What kind of instance is this?")))) + +(defun swap-wrappers-and-slots (i1 i2) + (without-interrupts + (cond ((std-instance-p i1) + #+new-kcl-wrapper + (swap-structure-contents i1 i2) + #-new-kcl-wrapper + (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 "What kind of instance is this?"))))) + + + + + + +(defun get-class-slot-value-1 (object wrapper slot-name) + (let ((entry (assoc slot-name (wrapper-class-slots wrapper)))) + (if (null entry) + (slot-missing (wrapper-class wrapper) object slot-name 'slot-value) + (if (eq (cdr entry) *slot-unbound*) + (slot-unbound (wrapper-class wrapper) object slot-name) + (cdr entry))))) + +(defun set-class-slot-value-1 (new-value object wrapper slot-name) + (let ((entry (assoc slot-name (wrapper-class-slots wrapper)))) + (if (null entry) + (slot-missing (wrapper-class wrapper) + object + slot-name + 'setf + new-value) + (setf (cdr entry) new-value)))) + +(defmethod class-slot-value ((class std-class) slot-name) + (let ((wrapper (class-wrapper class)) + (prototype (class-prototype class))) + (get-class-slot-value-1 prototype wrapper slot-name))) + +(defmethod (setf class-slot-value) (nv (class std-class) slot-name) + (let ((wrapper (class-wrapper class)) + (prototype (class-prototype class))) + (set-class-slot-value-1 nv prototype wrapper slot-name))) + + + +(defun find-slot-definition (class slot-name) + (dolist (slot (class-slots class) nil) + (when (eql slot-name (slot-definition-name slot)) + (return slot)))) + +(defun slot-value (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-value) + (slot-value-using-class class object slot-definition)))) + +(setf (gdefinition 'slot-value-normal) #'slot-value) + +(define-compiler-macro slot-value (object-form slot-name-form) + (if (and (constantp slot-name-form) + (let ((slot-name (eval slot-name-form))) + (and (symbolp slot-name) (symbol-package slot-name)))) + `(accessor-slot-value ,object-form ,slot-name-form) + `(slot-value-normal ,object-form ,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) + (slot-missing class object slot-name 'setf) + (setf (slot-value-using-class class object slot-definition) + new-value)))) + +(setf (gdefinition 'set-slot-value-normal) #'set-slot-value) + +(define-compiler-macro set-slot-value (object-form slot-name-form new-value-form) + (if (and (constantp slot-name-form) + (let ((slot-name (eval slot-name-form))) + (and (symbolp slot-name) (symbol-package slot-name)))) + `(accessor-set-slot-value ,object-form ,slot-name-form ,new-value-form) + `(set-slot-value-normal ,object-form ,slot-name-form ,new-value-form))) + +(defconstant *optimize-slot-boundp* nil) + +(defun slot-boundp (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-boundp) + (slot-boundp-using-class class object slot-definition)))) + +(setf (gdefinition 'slot-boundp-normal) #'slot-boundp) + +(define-compiler-macro slot-boundp (object-form slot-name-form) + (if (and (constantp slot-name-form) + (let ((slot-name (eval slot-name-form))) + (and (symbolp slot-name) (symbol-package slot-name)))) + `(accessor-slot-boundp ,object-form ,slot-name-form) + `(slot-boundp-normal ,object-form ,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)))) + +(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) + (%instance-ref (std-instance-slots instance) location)) + +(defun funcallable-standard-instance-access (instance location) + (%instance-ref (fsc-instance-slots instance) location)) + +(defmethod slot-value-using-class ((class std-class) + (object standard-object) + (slotd standard-effective-slot-definition)) + (let* ((location (slot-definition-location slotd)) + (value (typecase location + (fixnum + (cond ((std-instance-p object) + (unless (eq 't (wrapper-state (std-instance-wrapper object))) + (check-wrapper-validity object)) + (%instance-ref (std-instance-slots object) location)) + ((fsc-instance-p object) + (unless (eq 't (wrapper-state (fsc-instance-wrapper object))) + (check-wrapper-validity object)) + (%instance-ref (fsc-instance-slots object) location)) + (t (error "What kind of instance is this?")))) + (cons + (cdr location)) + (t + (error "The slot ~s has neither :instance nor :class allocation, ~@ + so it can't be read by the default ~s method." + slotd 'slot-value-using-class))))) + (if (eq value *slot-unbound*) + (slot-unbound class object (slot-definition-name slotd)) + value))) + +(defmethod (setf slot-value-using-class) + (new-value (class std-class) + (object standard-object) + (slotd standard-effective-slot-definition)) + (let ((location (slot-definition-location slotd))) + (typecase location + (fixnum + (cond ((std-instance-p object) + (unless (eq 't (wrapper-state (std-instance-wrapper object))) + (check-wrapper-validity object)) + (setf (%instance-ref (std-instance-slots object) location) new-value)) + ((fsc-instance-p object) + (unless (eq 't (wrapper-state (fsc-instance-wrapper object))) + (check-wrapper-validity object)) + (setf (%instance-ref (fsc-instance-slots object) location) new-value)) + (t (error "What kind of instance is this?")))) + (cons + (setf (cdr location) new-value)) + (t + (error "The slot ~s has neither :instance nor :class allocation, ~@ + so it can't be written by the default ~s method." + slotd '(setf slot-value-using-class)))))) + +(defmethod slot-boundp-using-class + ((class std-class) + (object standard-object) + (slotd standard-effective-slot-definition)) + (let* ((location (slot-definition-location slotd)) + (value (typecase location + (fixnum + (cond ((std-instance-p object) + (unless (eq 't (wrapper-state (std-instance-wrapper object))) + (check-wrapper-validity object)) + (%instance-ref (std-instance-slots object) location)) + ((fsc-instance-p object) + (unless (eq 't (wrapper-state (fsc-instance-wrapper object))) + (check-wrapper-validity object)) + (%instance-ref (fsc-instance-slots object) location)) + (t (error "What kind of instance is this?")))) + (cons + (cdr location)) + (t + (error "The slot ~s has neither :instance nor :class allocation, ~@ + so it can't be read by the default ~s method." + slotd 'slot-boundp-using-class))))) + (not (eq value *slot-unbound*)))) + +(defmethod slot-makunbound-using-class + ((class std-class) + (object standard-object) + (slotd standard-effective-slot-definition)) + (let ((location (slot-definition-location slotd))) + (typecase location + (fixnum + (cond ((std-instance-p object) + (unless (eq 't (wrapper-state (std-instance-wrapper object))) + (check-wrapper-validity object)) + (setf (%instance-ref (std-instance-slots object) location) *slot-unbound*)) + ((fsc-instance-p object) + (unless (eq 't (wrapper-state (fsc-instance-wrapper object))) + (check-wrapper-validity object)) + (setf (%instance-ref (fsc-instance-slots object) location) *slot-unbound*)) + (t (error "What kind of instance is this?")))) + (cons + (setf (cdr location) *slot-unbound*)) + (t + (error "The slot ~s has neither :instance nor :class allocation, ~@ + so it can't be written by the default ~s method." + slotd 'slot-makunbound-using-class)))) + nil) + +(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))) + #+cmu (declare (type function function)) + (if (eq value *slot-unbound*) + (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))) + #+cmu (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)) + #-new-kcl-wrapper t + #+new-kcl-wrapper + (let* ((function (slot-definition-internal-reader-function slotd)) + (value (funcall function object))) + #+cmu (declare (type function function)) + (not (eq value *slot-unbound*)))) + +(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 if 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 "The slot ~S is unbound in the object ~S." slot-name instance)) + +(defun slot-unbound-internal (instance position) + (slot-unbound (class-of instance) instance + (etypecase position + (fixnum + (nth position + (wrapper-instance-slots-layout (wrapper-of instance)))) + (cons + (car position))))) + + +(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)) + #-new-kcl-wrapper + (let ((constructor (class-defstruct-constructor class))) + (if constructor + (funcall constructor) + (error "Can't allocate an instance of class ~S" (class-name class)))) + #+new-kcl-wrapper + (allocate-standard-instance (class-wrapper class))) + + |