| -rw-r--r-- | gcl/pcl/macros.lisp | 787 |
diff --git a/gcl/pcl/macros.lisp b/gcl/pcl/macros.lisp new file mode 100644 index 000000000..e45ed9107 --- /dev/null +++ b/gcl/pcl/macros.lisp @@ -0,0 +1,787 @@ +;;;-*-Mode:LISP; Package:(PCL (LISP WALKER)); 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. +;;; ************************************************************************* +;;; +;;; Macros global variable definitions, and other random support stuff used +;;; by the rest of the system. +;;; +;;; For simplicity (not having to use eval-when a lot), this file must be +;;; loaded before it can be compiled. +;;; + +(in-package :pcl) + +(proclaim '(declaration + #-Genera values ;I use this so that Zwei can remind + ;me what values a function returns. + + #-Genera arglist ;Tells me what the pretty arglist + ;of something (which probably takes + ;&rest args) is. + + #-Genera indentation ;Tells ZWEI how to indent things + ;like defclass. + class + variable-rebinding + pcl-fast-call + method-name + method-lambda-list + )) + +;;; Age old functions which CommonLisp cleaned-up away. They probably exist +;;; in other packages in all CommonLisp implementations, but I will leave it +;;; to the compiler to optimize into calls to them. +;;; +;;; Common Lisp BUG: +;;; Some Common Lisps define these in the Lisp package which causes +;;; all sorts of lossage. Common Lisp should explictly specify which +;;; symbols appear in the Lisp package. +;;; +(eval-when (compile load eval) + +(defmacro memq (item list) `(member ,item ,list :test #'eq)) +(defmacro assq (item list) `(assoc ,item ,list :test #'eq)) +(defmacro rassq (item list) `(rassoc ,item ,list :test #'eq)) +(defmacro delq (item list) `(delete ,item ,list :test #'eq)) +(defmacro posq (item list) `(position ,item ,list :test #'eq)) +(defmacro neq (x y) `(not (eq ,x ,y))) + + +(defun make-caxr (n form) + (if (< n 4) + `(,(nth n '(car cadr caddr cadddr)) ,form) + (make-caxr (- n 4) `(cddddr ,form)))) + +(defun make-cdxr (n form) + (cond ((zerop n) form) + ((< n 5) `(,(nth n '(identity cdr cddr cdddr cddddr)) ,form)) + (t (make-cdxr (- n 4) `(cddddr ,form))))) +) + +(deftype non-negative-fixnum () + '(and fixnum (integer 0 *))) + +(defun true (&rest ignore) (declare (ignore ignore)) t) +(defun false (&rest ignore) (declare (ignore ignore)) nil) +(defun zero (&rest ignore) (declare (ignore ignore)) 0) + +(defun make-plist (keys vals) + (if (null vals) + () + (list* (car keys) + (car vals) + (make-plist (cdr keys) (cdr vals))))) + +(defun remtail (list tail) + (if (eq list tail) () (cons (car list) (remtail (cdr list) tail)))) + +;;; ONCE-ONLY does the same thing as it does in zetalisp. I should have just +;;; lifted it from there but I am honest. Not only that but this one is +;;; written in Common Lisp. I feel a lot like bootstrapping, or maybe more +;;; like rebuilding Rome. +(defmacro once-only (vars &body body) + (let ((gensym-var (gensym)) + (run-time-vars (gensym)) + (run-time-vals (gensym)) + (expand-time-val-forms ())) + (dolist (var vars) + (push `(if (or (symbolp ,var) + (numberp ,var) + (and (listp ,var) + (member (car ,var) '(quote function)))) + ,var + (let ((,gensym-var (gensym))) + (push ,gensym-var ,run-time-vars) + (push ,var ,run-time-vals) + ,gensym-var)) + expand-time-val-forms)) + `(let* (,run-time-vars + ,run-time-vals + (wrapped-body + (let ,(mapcar #'list vars (reverse expand-time-val-forms)) + ,@body))) + `(let ,(mapcar #'list (reverse ,run-time-vars) + (reverse ,run-time-vals)) + ,wrapped-body)))) + +(eval-when (compile load eval) +(defun extract-declarations (body &optional environment) + ;;(declare (values documentation declarations body)) + (let (documentation declarations form) + (when (and (stringp (car body)) + (cdr body)) + (setq documentation (pop body))) + (block outer + (loop + (when (null body) (return-from outer nil)) + (setq form (car body)) + (when (block inner + (loop (cond ((not (listp form)) + (return-from outer nil)) + ((eq (car form) 'declare) + (return-from inner 't)) + (t + (multiple-value-bind (newform macrop) + (macroexpand-1 form environment) + (if (or (not (eq newform form)) macrop) + (setq form newform) + (return-from outer nil))))))) + (pop body) + (dolist (declaration (cdr form)) + (push declaration declarations))))) + (values documentation + (and declarations `((declare ,.(nreverse declarations)))) + body))) +) + +(defun get-declaration (name declarations &optional default) + (dolist (d declarations default) + (dolist (form (cdr d)) + (when (and (consp form) (eq (car form) name)) + (return-from get-declaration (cdr form)))))) + + +#+Lucid +(eval-when (compile load eval) + (eval `(defstruct ,(intern "FASLESCAPE" (find-package 'lucid))))) + +(defvar *keyword-package* (find-package 'keyword)) + +(defun make-keyword (symbol) + (intern (symbol-name symbol) *keyword-package*)) + +(eval-when (compile load eval) + +(defun string-append (&rest strings) + (setq strings (copy-list strings)) ;The explorer can't even + ;rplaca an &rest arg? + (do ((string-loc strings (cdr string-loc))) + ((null string-loc) + (apply #'concatenate 'string strings)) + (rplaca string-loc (string (car string-loc))))) +) + +(defun symbol-append (sym1 sym2 &optional (package *package*)) + (intern (string-append sym1 sym2) package)) + +(defmacro check-member (place list &key (test #'eql) (pretty-name place)) + (once-only (place list) + `(or (member ,place ,list :test ,test) + (error "The value of ~A, ~S is not one of ~S." + ',pretty-name ,place ,list)))) + +(defmacro alist-entry (alist key make-entry-fn) + (once-only (alist key) + `(or (assq ,key ,alist) + (progn (setf ,alist (cons (,make-entry-fn ,key) ,alist)) + (car ,alist))))) + +;;; A simple version of destructuring-bind. + +;;; This does no more error checking than CAR and CDR themselves do. Some +;;; attempt is made to be smart about preserving intermediate values. It +;;; could be better, although the only remaining case should be easy for +;;; the compiler to spot since it compiles to PUSH POP. +;;; +;;; Common Lisp BUG: +;;; Common Lisp should have destructuring-bind. +;;; +(defmacro destructuring-bind (pattern form &body body) + (multiple-value-bind (ignore declares body) + (extract-declarations body) + (declare (ignore ignore)) + (multiple-value-bind (setqs binds) + (destructure pattern form) + `(let ,binds + ,@declares + ,@setqs + (progn .destructure-form.) + . ,body)))) + +(eval-when (compile load eval) +(defun destructure (pattern form) + ;;(declare (values setqs binds)) + (let ((*destructure-vars* ()) + (setqs ())) + (declare (special *destructure-vars*)) + (setq *destructure-vars* '(.destructure-form.) + setqs (list `(setq .destructure-form. ,form)) + form '.destructure-form.) + (values (nconc setqs (nreverse (destructure-internal pattern form))) + (delete nil *destructure-vars*)))) + +(defun destructure-internal (pattern form) + ;; When we are called, pattern must be a list. Form should be a symbol + ;; which we are free to setq containing the value to be destructured. + ;; Optimizations are performed for the last element of pattern cases. + ;; we assume that the compiler is smart about gensyms which are bound + ;; but only for a short period of time. + (declare (special *destructure-vars*)) + (let ((gensym (gensym)) + (pending-pops 0) + (var nil) + (setqs ())) + (labels + ((make-pop (var form pop-into) + (prog1 + (cond ((zerop pending-pops) + `(progn ,(and var `(setq ,var (car ,form))) + ,(and pop-into `(setq ,pop-into (cdr ,form))))) + ((null pop-into) + (and var `(setq ,var ,(make-caxr pending-pops form)))) + (t + `(progn (setq ,pop-into ,(make-cdxr pending-pops form)) + ,(and var `(setq ,var (pop ,pop-into)))))) + (setq pending-pops 0)))) + (do ((pat pattern (cdr pat))) + ((null pat) ()) + (if (symbolp (setq var (car pat))) + (progn + #-:coral (unless (memq var '(nil ignore)) + (push var *destructure-vars*)) + #+:coral (push var *destructure-vars*) + (cond ((null (cdr pat)) + (push (make-pop var form ()) setqs)) + ((symbolp (cdr pat)) + (push (make-pop var form (cdr pat)) setqs) + (push (cdr pat) *destructure-vars*) + (return ())) + #-:coral + ((memq var '(nil ignore)) (incf pending-pops)) + #-:coral + ((memq (cadr pat) '(nil ignore)) + (push (make-pop var form ()) setqs) + (incf pending-pops 1)) + (t + (push (make-pop var form form) setqs)))) + (progn + (push `(let ((,gensym ())) + ,(make-pop gensym + form + (if (symbolp (cdr pat)) (cdr pat) form)) + ,@(nreverse + (destructure-internal + (if (consp pat) (car pat) pat) + gensym))) + setqs) + (when (symbolp (cdr pat)) + (push (cdr pat) *destructure-vars*) + (return))))) + setqs))) +) + + +(defmacro collecting-once (&key initial-value) + `(let* ((head ,initial-value) + (tail ,(and initial-value `(last head)))) + (values #'(lambda (value) + (if (null head) + (setq head (setq tail (list value))) + (unless (memq value head) + (setq tail + (cdr (rplacd tail (list value))))))) + #'(lambda nil head)))) + +(defmacro doplist ((key val) plist &body body &environment env) + (multiple-value-bind (doc decls bod) + (extract-declarations body env) + (declare (ignore doc)) + `(let ((.plist-tail. ,plist) ,key ,val) + ,@decls + (loop (when (null .plist-tail.) (return nil)) + (setq ,key (pop .plist-tail.)) + (when (null .plist-tail.) + (error "Malformed plist in doplist, odd number of elements.")) + (setq ,val (pop .plist-tail.)) + (progn ,@bod))))) + +(defmacro if* (condition true &rest false) + `(if ,condition ,true (progn ,@false))) + +(defmacro dolist-carefully ((var list improper-list-handler) &body body) + `(let ((,var nil) + (.dolist-carefully. ,list)) + (loop (when (null .dolist-carefully.) (return nil)) + (if (consp .dolist-carefully.) + (progn + (setq ,var (pop .dolist-carefully.)) + ,@body) + (,improper-list-handler))))) + + ;; +;;;;;; printing-random-thing + ;; +;;; Similar to printing-random-object in the lisp machine but much simpler +;;; and machine independent. +(defmacro printing-random-thing ((thing stream) &body body) + #+cmu17 + `(print-unreadable-object (,thing ,stream :identity t) ,@body) + #-cmu17 + (once-only (thing stream) + `(progn + #+cmu + (when *print-readably* + (error "~S cannot be printed readably." ,thing)) + (format ,stream "#<") + ,@body + (format ,stream " ") + (printing-random-thing-internal ,thing ,stream) + (format ,stream ">")))) + +(defun printing-random-thing-internal (thing stream) + (declare (ignore thing stream)) + nil) + + ;; +;;;;;; + ;; + +(defun capitalize-words (string &optional (dashes-p t)) + (let ((string (copy-seq (string string)))) + (declare (string string)) + (do* ((flag t flag) + (length (length string) length) + (char nil char) + (i 0 (+ i 1))) + ((= i length) string) + (setq char (elt string i)) + (cond ((both-case-p char) + (if flag + (and (setq flag (lower-case-p char)) + (setf (elt string i) (char-upcase char))) + (and (not flag) (setf (elt string i) (char-downcase char)))) + (setq flag nil)) + ((char-equal char #\-) + (setq flag t) + (unless dashes-p (setf (elt string i) #\space))) + (t (setq flag nil)))))) + +#-(or lucid kcl) +(eval-when (compile load eval) +;(warn "****** Things will go faster if you fix define-compiler-macro") +) + +#-cmu +(defmacro define-compiler-macro (name arglist &body body) + #+(or lucid kcl) + `(#+lucid lcl:def-compiler-macro #+kcl si::define-compiler-macro + ,name ,arglist + ,@body) + #-(or kcl lucid) + (declare (ignore name arglist body)) + #-(or kcl lucid) + nil) + + +;;; +;;; FIND-CLASS +;;; +;;; This is documented in the CLOS specification. +;;; +(defvar *find-class* (make-hash-table :test #'eq)) + +(defun make-constant-function (value) + #'(lambda (object) + (declare (ignore object)) + value)) + +(defun function-returning-nil (x) + (declare (ignore x)) + nil) + +(defun function-returning-t (x) + (declare (ignore x)) + t) + +(defmacro find-class-cell-class (cell) + `(car ,cell)) + +(defmacro find-class-cell-predicate (cell) + `(cadr ,cell)) + +(defmacro find-class-cell-make-instance-function-keys (cell) + `(cddr ,cell)) + +(defmacro make-find-class-cell (class-name) + (declare (ignore class-name)) + '(list* nil #'function-returning-nil nil)) + +(defun find-class-cell (symbol &optional dont-create-p) + (or (gethash symbol *find-class*) + (unless dont-create-p + (unless (legal-class-name-p symbol) + (error "~S is not a legal class name." symbol)) + (setf (gethash symbol *find-class*) (make-find-class-cell symbol))))) + +(defvar *create-classes-from-internal-structure-definitions-p* t) + +(defun find-class-from-cell (symbol cell &optional (errorp t)) + (or (find-class-cell-class cell) + (and *create-classes-from-internal-structure-definitions-p* + (structure-type-p symbol) + (find-structure-class symbol)) + (cond ((null errorp) nil) + ((legal-class-name-p symbol) + (error "No class named: ~S." symbol)) + (t + (error "~S is not a legal class name." symbol))))) + +(defun find-class-predicate-from-cell (symbol cell &optional (errorp t)) + (unless (find-class-cell-class cell) + (find-class-from-cell symbol cell errorp)) + (find-class-cell-predicate cell)) + +(defun legal-class-name-p (x) + (and (symbolp x) + (not (keywordp x)))) + +(defun find-class (symbol &optional (errorp t) environment) + (declare (ignore environment)) + (find-class-from-cell + symbol (find-class-cell symbol errorp) errorp)) + +(defun find-class-predicate (symbol &optional (errorp t) environment) + (declare (ignore environment)) + (find-class-predicate-from-cell + symbol (find-class-cell symbol errorp) errorp)) + +(defvar *boot-state* nil) ; duplicate defvar to defs.lisp + +; Use this definition in any CL implementation supporting +; both define-compiler-macro and load-time-value. +#+cmu ; Note that in CMU, lisp:find-class /= pcl:find-class +(define-compiler-macro find-class (&whole form + symbol &optional (errorp t) environment) + (declare (ignore environment)) + (if (and (constantp symbol) + (legal-class-name-p (eval symbol)) + (constantp errorp) + (member *boot-state* '(braid complete))) + (let ((symbol (eval symbol)) + (errorp (not (null (eval errorp)))) + (class-cell (make-symbol "CLASS-CELL"))) + `(let ((,class-cell (load-time-value (find-class-cell ',symbol)))) + (or (find-class-cell-class ,class-cell) + #-cmu17 + (find-class-from-cell ',symbol ,class-cell ,errorp) + #+cmu17 + ,(if errorp + `(find-class-from-cell ',symbol ,class-cell t) + `(and (kernel:class-cell-class + ',(kernel:find-class-cell symbol)) + (find-class-from-cell ',symbol ,class-cell nil)))))) + form)) + +#-setf +(defsetf find-class (symbol &optional (errorp t) environment) (new-value) + (declare (ignore errorp environment)) + `(SETF\ PCL\ FIND-CLASS ,new-value ,symbol)) + +(defun #-setf SETF\ PCL\ FIND-CLASS #+setf (setf find-class) (new-value symbol) + (if (legal-class-name-p symbol) + (let ((cell (find-class-cell symbol))) + (setf (find-class-cell-class cell) new-value) + (when (or (eq *boot-state* 'complete) + (eq *boot-state* 'braid)) + #+cmu17 + (let ((lclass (kernel:layout-class (class-wrapper new-value)))) + (setf (lisp:class-name lclass) (class-name new-value)) + (unless (eq (lisp:find-class symbol nil) lclass) + (setf (lisp:find-class symbol) lclass))) + + (setf (find-class-cell-predicate cell) + (symbol-function (class-predicate-name new-value))) + (when (and new-value (not (forward-referenced-class-p new-value))) + + (dolist (keys+aok (find-class-cell-make-instance-function-keys cell)) + (update-initialize-info-internal + (initialize-info new-value (car keys+aok) nil (cdr keys+aok)) + 'make-instance-function))))) + (error "~S is not a legal class name." symbol))) + +#-setf +(defsetf find-class-predicate (symbol &optional (errorp t) environment) (new-value) + (declare (ignore errorp environment)) + `(SETF\ PCL\ FIND-CLASS-PREDICATE ,new-value ,symbol)) + +(defun #-setf SETF\ PCL\ FIND-CLASS-PREDICATE #+setf (setf find-class-predicate) + (new-value symbol) + (if (legal-class-name-p symbol) + (setf (find-class-cell-predicate (find-class-cell symbol)) new-value) + (error "~S is not a legal class name." symbol))) + +(defun find-wrapper (symbol) + (class-wrapper (find-class symbol))) + +#|| ; Anything that used this should use eval instead. +(defun reduce-constant (old) + (let ((new (eval old))) + (if (eq new old) + new + (if (constantp new) + (reduce-constant new) + new)))) +||# + +(defmacro gathering1 (gatherer &body body) + `(gathering ((.gathering1. ,gatherer)) + (macrolet ((gather1 (x) `(gather ,x .gathering1.))) + ,@body))) + +;;; +;;; +;;; +(defmacro vectorizing (&key (size 0)) + `(let* ((limit ,size) + (result (make-array limit)) + (index 0)) + (values #'(lambda (value) + (if (= index limit) + (error "vectorizing more elements than promised.") + (progn + (setf (svref result index) value) + (incf index) + value))) + #'(lambda () result)))) + +;;; +;;; These are augmented definitions of list-elements and list-tails from +;;; iterate.lisp. These versions provide the extra :by keyword which can +;;; be used to specify the step function through the list. +;;; +(defmacro *list-elements (list &key (by #'cdr)) + `(let ((tail ,list)) + #'(lambda (finish) + (if (endp tail) + (funcall finish) + (prog1 (car tail) + (setq tail (funcall ,by tail))))))) + +(defmacro *list-tails (list &key (by #'cdr)) + `(let ((tail ,list)) + #'(lambda (finish) + (prog1 (if (endp tail) + (funcall finish) + tail) + (setq tail (funcall ,by tail)))))) + +(defmacro function-funcall (form &rest args) + #-cmu `(funcall ,form ,@args) + #+cmu `(funcall (the function ,form) ,@args)) + +(defmacro function-apply (form &rest args) + #-cmu `(apply ,form ,@args) + #+cmu `(apply (the function ,form) ,@args)) + + +;;; +;;; Convert a function name to its standard setf function name. We have to +;;; do this hack because not all Common Lisps have yet converted to having +;;; setf function specs. +;;; +;;; In a port that does have setf function specs you can use those just by +;;; making the obvious simple changes to these functions. The rest of PCL +;;; believes that there are function names like (SETF <foo>), this is the +;;; only place that knows about this hack. +;;; +(eval-when (compile load eval) +; In 15e (and also 16c), using the built in setf mechanism costs +; a hash table lookup every time a setf function is called. +; Uncomment the next line to use the built in setf mechanism. +;#+cmu (pushnew :setf *features*) +) + +(eval-when (compile load eval) + +#-setf +(defvar *setf-function-names* (make-hash-table :size 200 :test #'eq)) + +(defun get-setf-function-name (name) + #+setf `(setf ,name) + #-setf + (or (gethash name *setf-function-names*) + (setf (gethash name *setf-function-names*) + (let ((pkg (symbol-package name))) + (if pkg + (intern (format nil + "SETF ~A ~A" + (package-name pkg) + (symbol-name name)) + *the-pcl-package*) + (make-symbol (format nil "SETF ~A" (symbol-name name)))))))) + +;;; +;;; Call this to define a setf macro for a function with the same behavior as +;;; specified by the SETF function cleanup proposal. Specifically, this will +;;; cause: (SETF (FOO a b) x) to expand to (|SETF FOO| x a b). +;;; +;;; do-standard-defsetf A macro interface for use at top level +;;; in files. Unfortunately, users may +;;; have to use this for a while. +;;; +;;; do-standard-defsetfs-for-defclass A special version called by defclass. +;;; +;;; do-standard-defsetf-1 A functional interface called by the +;;; above, defmethod and defgeneric. +;;; Since this is all a crock anyways, +;;; users are free to call this as well. +;;; +(defmacro do-standard-defsetf (&rest function-names) + `(eval-when (compile load eval) + (dolist (fn-name ',function-names) (do-standard-defsetf-1 fn-name)))) + +(defun do-standard-defsetfs-for-defclass (accessors) + (dolist (name accessors) (do-standard-defsetf-1 name))) + +(defun do-standard-defsetf-1 (function-name) + #+setf + (declare (ignore function-name)) + #+setf nil + #-setf + (unless (and (setfboundp function-name) + (get function-name 'standard-setf)) + (setf (get function-name 'standard-setf) t) + (let* ((setf-function-name (get-setf-function-name function-name))) + + #+Genera + (let ((fn #'(lambda (form) + (lt::help-defsetf + '(&rest accessor-args) '(new-value) function-name 'nil + `(`(,',setf-function-name ,new-value .,accessor-args)) + form)))) + (setf (get function-name 'lt::setf-method) fn + (get function-name 'lt::setf-method-internal) fn)) + + #+Lucid + (lucid::set-simple-setf-method + function-name + #'(lambda (form new-value) + (let* ((bindings (mapcar #'(lambda (x) `(,(gensym) ,x)) + (cdr form))) + (vars (mapcar #'car bindings))) + ;; This may wrap spurious LET bindings around some form, + ;; but the PQC compiler will unwrap then. + `(LET (,.bindings) + (,setf-function-name ,new-value . ,vars))))) + + #+kcl + (let ((helper (gensym))) + (setf (macro-function helper) + #'(lambda (form env) + (declare (ignore env)) + (let* ((loc-args (butlast (cdr form))) + (bindings (mapcar #'(lambda (x) `(,(gensym) ,x)) loc-args)) + (vars (mapcar #'car bindings))) + `(let ,bindings + (,setf-function-name ,(car (last form)) ,@vars))))) + (eval `(defsetf ,function-name ,helper))) + #+Xerox + (flet ((setf-expander (body env) + (declare (ignore env)) + (let ((temps + (mapcar #'(lambda (x) (declare (ignore x)) (gensym)) + (cdr body))) + (forms (cdr body)) + (vars (list (gensym)))) + (values temps + forms + vars + `(,setf-function-name ,@vars ,@temps) + `(,function-name ,@temps))))) + (let ((setf-method-expander (intern (concatenate 'string + (symbol-name function-name) + "-setf-expander") + (symbol-package function-name)))) + (setf (get function-name :setf-method-expander) setf-method-expander + (symbol-function setf-method-expander) #'setf-expander))) + + #-(or Genera Lucid kcl Xerox) + (eval `(defsetf ,function-name (&rest accessor-args) (new-value) + (let* ((bindings (mapcar #'(lambda (x) `(,(gensym) ,x)) accessor-args)) + (vars (mapcar #'car bindings))) + `(let ,bindings + (,',setf-function-name ,new-value ,@vars))))) + + ))) + +(defun setfboundp (symbol) + #+Genera (not (null (get-properties (symbol-plist symbol) + 'lt::(derived-setf-function trivial-setf-method + setf-equivalence setf-method)))) + #+Lucid (locally + (declare (special lucid::*setf-inverse-table* + lucid::*simple-setf-method-table* + lucid::*setf-method-expander-table*)) + (or (gethash symbol lucid::*setf-inverse-table*) + (gethash symbol lucid::*simple-setf-method-table*) + (gethash symbol lucid::*setf-method-expander-table*))) + #+kcl (or (get symbol 'si::setf-method) + (get symbol 'si::setf-update-fn) + (get symbol 'si::setf-lambda)) + #+Xerox (or (get symbol :setf-inverse) + (get symbol 'il:setf-inverse) + (get symbol 'il:setfn) + (get symbol :shared-setf-inverse) + (get symbol :setf-method-expander) + (get symbol 'il:setf-method-expander)) + #+:coral (or (get symbol 'ccl::setf-inverse) + (get symbol 'ccl::setf-method-expander)) + #+cmu (fboundp `(setf ,symbol)) + #-(or Genera Lucid KCL Xerox :coral cmu) nil) + +);eval-when + + +;;; +;;; PCL, like user code, must endure the fact that we don't have a properly +;;; working setf. Many things work because they get mentioned by a defclass +;;; or defmethod before they are used, but others have to be done by hand. +;;; +(do-standard-defsetf + class-wrapper ;*** + generic-function-name + method-function-plist + method-function-get + plist-value + object-plist + gdefinition + slot-value-using-class + ) + +(defsetf slot-value set-slot-value) + +(defvar *redefined-functions* nil) + +(defmacro original-definition (name) + `(get ,name ':definition-before-pcl)) + +(defun redefine-function (name new) + (pushnew name *redefined-functions*) + (unless (original-definition name) + (setf (original-definition name) + (symbol-function name))) + (setf (symbol-function name) + (symbol-function new))) + |