(in-package "SB-PCL")
\f
+;;;; DEFCLASS macro and close personal friends
+
+;;; state for the current DEFCLASS expansion
+(defvar *initfunctions-for-this-defclass*)
+(defvar *readers-for-this-defclass*)
+(defvar *writers-for-this-defclass*)
+(defvar *slot-names-for-this-defclass*)
-(defun make-progn (&rest forms)
- (let ((progn-form nil))
- (labels ((collect-forms (forms)
- (unless (null forms)
- (collect-forms (cdr forms))
- (if (and (listp (car forms))
- (eq (caar forms) 'progn))
- (collect-forms (cdar forms))
- (push (car forms) progn-form)))))
- (collect-forms forms)
- (cons 'progn progn-form))))
-\f
;;; Like the DEFMETHOD macro, the expansion of the DEFCLASS macro is
;;; fixed. DEFCLASS always expands into a call to LOAD-DEFCLASS. Until
;;; the meta-braid is set up, LOAD-DEFCLASS has a special definition
;;;
;;; After the metabraid has been setup, and the protocol for defining
;;; classes has been defined, the real definition of LOAD-DEFCLASS is
-;;; installed by the file defclass.lisp
-(defmacro defclass (name direct-superclasses direct-slots &rest options)
- (expand-defclass name direct-superclasses direct-slots options))
-
-(defun expand-defclass (name supers slots options)
- ;; FIXME: We should probably just ensure that the relevant
- ;; DEFVAR/DEFPARAMETERs occur before this definition, rather
- ;; than locally declaring them SPECIAL.
- (declare (special *boot-state* *the-class-structure-class*))
- (setq supers (copy-tree supers)
- slots (copy-tree slots)
- options (copy-tree options))
- (let ((metaclass 'standard-class))
- (dolist (option options)
- (if (not (listp option))
- (error "~S is not a legal defclass option." option)
- (when (eq (car option) ':metaclass)
- (unless (legal-class-name-p (cadr option))
- (error "The value of the :metaclass option (~S) is not a~%~
- legal class name."
- (cadr option)))
- (setq metaclass
- (case (cadr option)
- (cl:standard-class 'standard-class)
- (cl:structure-class 'structure-class)
- (t (cadr option))))
- (setf options (remove option options))
- (return t))))
-
- (let ((*initfunctions* ())
- (*readers* ()) ;Truly a crock, but we got
- (*writers* ())) ;to have it to live nicely.
- (declare (special *initfunctions* *readers* *writers*))
- (let ((canonical-slots
- (mapcar #'(lambda (spec)
- (canonicalize-slot-specification name spec))
- slots))
- (other-initargs
- (mapcar #'(lambda (option)
- (canonicalize-defclass-option name option))
- options))
- (defstruct-p (and (eq *boot-state* 'complete)
- (let ((mclass (find-class metaclass nil)))
- (and mclass
- (*subtypep
- mclass
- *the-class-structure-class*))))))
- (let ((defclass-form
- `(progn
- ,@(mapcar (lambda (x)
- `(declaim (ftype (function (t) t) ,x)))
- *readers*)
- ,@(mapcar (lambda (x)
- `(declaim (ftype (function (t t) t) ,x)))
- *writers*)
- (let ,(mapcar #'cdr *initfunctions*)
- (load-defclass ',name
- ',metaclass
- ',supers
- (list ,@canonical-slots)
- (list ,@(apply #'append
- (when defstruct-p
- '(:from-defclass-p t))
- other-initargs)))))))
- ;; FIXME: The way that we do things like (EVAL DEFCLASS-FORM)
- ;; here is un-ANSI-Common-Lisp-y and leads to problems
- ;; (like DEFUN for the type predicate being called more than
- ;; once when we do DEFCLASS at the interpreter prompt),
- ;; causing bogus style warnings. It would be better to
- ;; rewrite this so that the macroexpansion looks like e.g.
- ;; (PROGN
- ;; (EVAL-WHEN (:COMPILE-TOPLEVEL :LOAD-TOPLEVEL :EXECUTE)
- ;; (FROB1 ..))
- ;; (EVAL-WHEN (:LOAD-TOPLEVEL :EXECUTE)
- ;; (FROB2 ..)))
- (if defstruct-p
- (progn
- (eval defclass-form) ; Define the class now, so that..
- `(progn ; ..the defstruct can be compiled.
- ,(class-defstruct-form (find-class name))
- ,defclass-form))
- (progn
- (when (eq *boot-state* 'complete)
- (inform-type-system-about-std-class name))
- defclass-form)))))))
+;;; installed by the file std-class.lisp
+(defmacro defclass (&environment env name direct-superclasses direct-slots &rest options)
+ (let (*initfunctions-for-this-defclass*
+ *readers-for-this-defclass* ;Truly a crock, but we got
+ *writers-for-this-defclass* ;to have it to live nicely.
+ *slot-names-for-this-defclass*)
+ ;; FIXME: It would be nice to collect all errors from the
+ ;; expansion of a defclass and signal them in a single go.
+ (multiple-value-bind (metaclass canonical-options)
+ (canonize-defclass-options name options)
+ (let ((canonical-slots (canonize-defclass-slots name direct-slots env))
+ ;; DEFSTRUCT-P should be true if the class is defined
+ ;; with a metaclass STRUCTURE-CLASS, so that a DEFSTRUCT
+ ;; is compiled for the class.
+ (defstruct-p (and (eq *boot-state* 'complete)
+ (let ((mclass (find-class metaclass nil)))
+ (and mclass
+ (*subtypep
+ mclass
+ *the-class-structure-class*))))))
+ (let* ((defclass-form
+ `(let ,(mapcar #'cdr *initfunctions-for-this-defclass*)
+ (load-defclass ',name
+ ',metaclass
+ ',direct-superclasses
+ (list ,@canonical-slots)
+ (list ,@(apply #'append
+ (when defstruct-p
+ '(:from-defclass-p t))
+ canonical-options))
+ ',*readers-for-this-defclass*
+ ',*writers-for-this-defclass*
+ ',*slot-names-for-this-defclass*))))
+ (if defstruct-p
+ (progn
+ ;; FIXME: (YUK!) Why do we do this? Because in order
+ ;; to make the defstruct form, we need to know what
+ ;; the accessors for the slots are, so we need already
+ ;; to have hooked into the CLOS machinery.
+ ;;
+ ;; There may be a better way to do this: it would
+ ;; involve knowing enough about PCL to ask "what will
+ ;; my slot names and accessors be"; failing this, we
+ ;; currently just evaluate the whole kaboodle, and
+ ;; then use CLASS-DIRECT-SLOTS. -- CSR, 2002-06-07
+ (eval defclass-form)
+ (let* ((include (or (and direct-superclasses
+ (fix-super (car direct-superclasses)))
+ (and (not (eq name 'structure-object))
+ *the-class-structure-object*)))
+ (defstruct-form (make-structure-class-defstruct-form
+ name (class-direct-slots (find-class name))
+ include)))
+ `(progn
+ (eval-when (:compile-toplevel :load-toplevel :execute)
+ ,defstruct-form) ; really compile the defstruct-form
+ (eval-when (:compile-toplevel :load-toplevel :execute)
+ ,defclass-form))))
+ `(progn
+ ;; By telling the type system at compile time about
+ ;; the existence of a class named NAME, we can avoid
+ ;; various bogus warnings about "type isn't defined yet"
+ ;; for code elsewhere in the same file which uses
+ ;; the name of the type.
+ ;;
+ ;; We only need to do this at compile time, because
+ ;; at load and execute time we write the actual
+ ;; full-blown class, so the "a class of this name is
+ ;; coming" note we write here would be irrelevant.
+ (eval-when (:compile-toplevel)
+ (%compiler-defclass ',name
+ ',*readers-for-this-defclass*
+ ',*writers-for-this-defclass*
+ ',*slot-names-for-this-defclass*))
+ (eval-when (:load-toplevel :execute)
+ ,defclass-form))))))))
+
+(defun canonize-defclass-options (class-name options)
+ (macrolet ((assert-single (option)
+ `(when ,option
+ (error "Multiple ~A options in DEFCLASS ~S."
+ ,(intern (string option) :keyword)
+ class-name))))
+ (let (metaclass
+ default-initargs
+ documentation
+ canonized-options)
+ (dolist (option options)
+ (unless (listp option)
+ (error "~S is not a legal defclass option." option))
+ (case (first option)
+ (:metaclass
+ (assert-single metaclass)
+ (let ((maybe-metaclass (second option)))
+ (unless (and maybe-metaclass (legal-class-name-p maybe-metaclass))
+ (error "~@<The value of the :metaclass option (~S) ~
+ is not a legal class name.~:@>"
+ maybe-metaclass))
+ (setf metaclass maybe-metaclass)))
+ (:default-initargs
+ (assert-single default-initargs)
+ (let (initargs arg-names)
+ (doplist (key val) (cdr option)
+ (when (member key arg-names)
+ (error 'simple-program-error
+ :format-control "~@<Duplicate initialization argument ~
+ name ~S in :DEFAULT-INITARGS of ~
+ DEFCLASS ~S.~:>"
+ :format-arguments (list key class-name)))
+ (push key arg-names)
+ (push ``(,',key ,,(make-initfunction val) ,',val) initargs))
+ (setf default-initargs t)
+ (push `(:direct-default-initargs (list ,@(nreverse initargs)))
+ canonized-options)))
+ (:documentation
+ (assert-single documentation)
+ (unless (stringp (second option))
+ (error "~S is not a legal :documentation value" (second option)))
+ (setf documentation t)
+ (push `(:documentation ,(second option)) canonized-options))
+ (otherwise
+ (push `(',(car option) ',(cdr option)) canonized-options))))
+ (values (or metaclass 'standard-class) (nreverse canonized-options)))))
+
+(defun canonize-defclass-slots (class-name slots env)
+ (let (canonized-specs)
+ (dolist (spec slots)
+ (when (atom spec)
+ (setf spec (list spec)))
+ (when (and (cdr spec) (null (cddr spec)))
+ (error 'simple-program-error
+ :format-control "~@<in DEFCLASS ~S, the slot specification ~S ~
+ is invalid; the probable intended meaning may ~
+ be achieved by specifiying ~S instead.~:>"
+ :format-arguments (list class-name spec
+ `(,(car spec) :initform ,(cadr spec)))))
+ (let* ((name (car spec))
+ (plist (cdr spec))
+ (readers ())
+ (writers ())
+ (initargs ())
+ (others ())
+ (unsupplied (list nil))
+ (initform unsupplied))
+ (check-slot-name-for-defclass name class-name env)
+ (push name *slot-names-for-this-defclass*)
+ (flet ((note-reader (x)
+ (unless (symbolp x)
+ (error 'simple-program-error
+ :format-control "Slot reader name ~S for slot ~S in ~
+ DEFCLASS ~S is not a symbol."
+ :format-arguments (list x name class-name)))
+ (push x readers)
+ (push x *readers-for-this-defclass*))
+ (note-writer (x)
+ (push x writers)
+ (push x *writers-for-this-defclass*)))
+ (doplist (key val) plist
+ (case key
+ (:accessor (note-reader val) (note-writer `(setf ,val)))
+ (:reader (note-reader val))
+ (:writer (note-writer val))
+ (:initarg
+ (unless (symbolp val)
+ (error 'simple-program-error
+ :format-control "Slot initarg name ~S for slot ~S in ~
+ DEFCLASS ~S is not a symbol."
+ :format-arguments (list val name class-name)))
+ (push val initargs))
+ (otherwise
+ (when (member key '(:initform :allocation :type :documentation))
+ (when (eq key :initform)
+ (setf initform val))
+ (when (get-properties others (list key))
+ (error 'simple-program-error
+ :format-control "Duplicate slot option ~S for slot ~
+ ~S in DEFCLASS ~S."
+ :format-arguments (list key name class-name))))
+ ;; For non-standard options multiple entries go in a list
+ (push val (getf others key))))))
+ ;; Unwrap singleton lists (AMOP 5.4.2)
+ (do ((head others (cddr head)))
+ ((null head))
+ (unless (cdr (second head))
+ (setf (second head) (car (second head)))))
+ (let ((canon `(:name ',name :readers ',readers :writers ',writers
+ :initargs ',initargs ',others)))
+ (push (if (eq initform unsupplied)
+ `(list* ,@canon)
+ `(list* :initfunction ,(make-initfunction initform)
+ ,@canon))
+ canonized-specs))))
+ (nreverse canonized-specs)))
+
+
+(defun check-slot-name-for-defclass (name class-name env)
+ (flet ((slot-name-illegal (reason)
+ (error 'simple-program-error
+ :format-control
+ (format nil "~~@<In DEFCLASS ~~S, the slot name ~~S ~
+ is ~A.~~@:>" reason)
+ :format-arguments (list class-name name))))
+ (cond ((not (symbolp name))
+ (slot-name-illegal "not a symbol"))
+ ((keywordp name)
+ (slot-name-illegal "a keyword"))
+ ((constantp name env)
+ (slot-name-illegal "a constant"))
+ ((member name *slot-names-for-this-defclass*)
+ (error 'simple-program-error
+ :format-control "Multiple slots named ~S in DEFCLASS ~S."
+ :format-arguments (list name class-name))))))
(defun make-initfunction (initform)
- (declare (special *initfunctions*))
(cond ((or (eq initform t)
(equal initform ''t))
'(function constantly-t))
(equal initform ''0))
'(function constantly-0))
(t
- (let ((entry (assoc initform *initfunctions* :test #'equal)))
+ (let ((entry (assoc initform *initfunctions-for-this-defclass*
+ :test #'equal)))
(unless entry
(setq entry (list initform
(gensym)
`(function (lambda () ,initform))))
- (push entry *initfunctions*))
+ (push entry *initfunctions-for-this-defclass*))
(cadr entry)))))
-(defun canonicalize-slot-specification (class-name spec)
- (declare (special *readers* *writers*))
- (cond ((and (symbolp spec)
- (not (keywordp spec))
- (not (memq spec '(t nil))))
- `'(:name ,spec))
- ((not (consp spec))
- (error "~S is not a legal slot specification." spec))
- ((null (cdr spec))
- `'(:name ,(car spec)))
- ((null (cddr spec))
- (error "In DEFCLASS ~S, the slot specification ~S is obsolete.~%~
- Convert it to ~S"
- class-name spec (list (car spec) :initform (cadr spec))))
- (t
- (let* ((name (pop spec))
- (readers ())
- (writers ())
- (initargs ())
- (unsupplied (list nil))
- (initform (getf spec :initform unsupplied)))
- (doplist (key val) spec
- (case key
- (:accessor (push val readers)
- (push `(setf ,val) writers))
- (:reader (push val readers))
- (:writer (push val writers))
- (:initarg (push val initargs))))
- (loop (unless (remf spec :accessor) (return)))
- (loop (unless (remf spec :reader) (return)))
- (loop (unless (remf spec :writer) (return)))
- (loop (unless (remf spec :initarg) (return)))
- (setq *writers* (append writers *writers*))
- (setq *readers* (append readers *readers*))
- (setq spec `(:name ',name
- :readers ',readers
- :writers ',writers
- :initargs ',initargs
- ',spec))
- (if (eq initform unsupplied)
- `(list* ,@spec)
- `(list* :initfunction ,(make-initfunction initform) ,@spec))))))
-
-(defun canonicalize-defclass-option (class-name option)
- (declare (ignore class-name))
- (case (car option)
- (:default-initargs
- (let ((canonical ()))
- (let (key val (tail (cdr option)))
- (loop (when (null tail) (return nil))
- (setq key (pop tail)
- val (pop tail))
- (push ``(,',key ,,(make-initfunction val) ,',val) canonical))
- `(':direct-default-initargs (list ,@(nreverse canonical))))))
- (:documentation
- `(',(car option) ',(cadr option)))
- (otherwise
- `(',(car option) ',(cdr option)))))
+(defun %compiler-defclass (name readers writers slots)
+ ;; ANSI says (Macro DEFCLASS, section 7.7) that DEFCLASS, if it
+ ;; "appears as a top level form, the compiler must make the class
+ ;; name be recognized as a valid type name in subsequent
+ ;; declarations (as for deftype) and be recognized as a valid class
+ ;; name for defmethod parameter specializers and for use as the
+ ;; :metaclass option of a subsequent defclass."
+ (preinform-compiler-about-class-type name)
+ (preinform-compiler-about-accessors readers writers slots))
+
+(defun preinform-compiler-about-class-type (name)
+ ;; Unless the type system already has an actual type attached to
+ ;; NAME (in which case (1) writing a placeholder value over that
+ ;; actual type as a compile-time side-effect would probably be a bad
+ ;; idea and (2) anyway we don't need to modify it in order to make
+ ;; NAME be recognized as a valid type name)
+ (unless (info :type :kind name)
+ ;; Tell the compiler to expect a class with the given NAME, by
+ ;; writing a kind of minimal placeholder type information. This
+ ;; placeholder will be overwritten later when the class is defined.
+ (setf (info :type :kind name) :forthcoming-defclass-type))
+ (values))
+
+(defun preinform-compiler-about-accessors (readers writers slots)
+ (flet ((inform (name type)
+ ;; FIXME: This matches what PROCLAIM FTYPE does, except
+ ;; that :WHERE-FROM is :DEFINED, not :DECLARED, and should
+ ;; probably be factored into a common function -- eg.
+ ;; (%proclaim-ftype name declared-or-defined).
+ (when (eq (info :function :where-from name) :assumed)
+ (proclaim-as-fun-name name)
+ (note-name-defined name :function)
+ (setf (info :function :where-from name) :defined
+ (info :function :type name) type))))
+ (let ((rtype (specifier-type '(function (t) t)))
+ (wtype (specifier-type '(function (t t) t))))
+ (dolist (reader readers)
+ (inform reader rtype))
+ (dolist (writer writers)
+ (inform writer wtype))
+ (dolist (slot slots)
+ (inform (slot-reader-name slot) rtype)
+ (inform (slot-boundp-name slot) rtype)
+ (inform (slot-writer-name slot) wtype)))))
\f
-;;; This is the early definition of load-defclass. It just collects up
-;;; all the class definitions in a list. Later, in the file
-;;; braid1.lisp, these are actually defined.
+;;; This is the early definition of LOAD-DEFCLASS. It just collects up
+;;; all the class definitions in a list. Later, in braid1.lisp, these
+;;; are actually defined.
;;; Each entry in *EARLY-CLASS-DEFINITIONS* is an EARLY-CLASS-DEFINITION.
(defparameter *early-class-definitions* ())
(values (early-collect-slots cpl)
cpl
(early-collect-default-initargs cpl)
- (gathering1 (collecting)
+ (let (collect)
(dolist (definition *early-class-definitions*)
(when (memq class-name (ecd-superclass-names definition))
- (gather1 (ecd-class-name definition))))))))
+ (push (ecd-class-name definition) collect)))
+ (nreverse collect)))))
(defun early-collect-slots (cpl)
(let* ((definitions (mapcar #'early-class-definition cpl))
(!bootstrap-get-slot 'class class 'direct-subclasses))
(declaim (notinline load-defclass))
-(defun load-defclass (name metaclass supers canonical-slots canonical-options)
+(defun load-defclass (name metaclass supers canonical-slots canonical-options
+ readers writers slot-names)
+ (%compiler-defclass name readers writers slot-names)
(setq supers (copy-tree supers)
canonical-slots (copy-tree canonical-slots)
canonical-options (copy-tree canonical-options))
- (when (eq metaclass 'standard-class)
- (inform-type-system-about-std-class name))
(let ((ecd
(make-early-class-definition name
- *load-truename*
+ *load-pathname*
metaclass
supers
canonical-slots
(setq *early-class-definitions*
(cons ecd (remove existing *early-class-definitions*)))
ecd))
-