1 ;;;; This file contains the optimization machinery for make-instance.
3 ;;;; This software is part of the SBCL system. See the README file for
6 ;;;; This software is derived from software originally released by
7 ;;;; Gerd Moellmann. Copyright and release statements follow. Later
8 ;;;; modifications to the software are in the public domain and are
9 ;;;; provided with absolutely no warranty. See the COPYING and
10 ;;;; CREDITS files for more information.
12 ;;; Copyright (C) 2002 Gerd Moellmann <gerd.moellmann@t-online.de>
13 ;;; All rights reserved.
15 ;;; Redistribution and use in source and binary forms, with or without
16 ;;; modification, are permitted provided that the following conditions
19 ;;; 1. Redistributions of source code must retain the above copyright
20 ;;; notice, this list of conditions and the following disclaimer.
21 ;;; 2. Redistributions in binary form must reproduce the above copyright
22 ;;; notice, this list of conditions and the following disclaimer in the
23 ;;; documentation and/or other materials provided with the distribution.
24 ;;; 3. The name of the author may not be used to endorse or promote
25 ;;; products derived from this software without specific prior written
28 ;;; THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
29 ;;; OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
30 ;;; WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 ;;; ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE
32 ;;; LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
33 ;;; CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
34 ;;; OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
35 ;;; BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
36 ;;; LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
37 ;;; (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
38 ;;; USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
45 ;;; Compiler macro for MAKE-INSTANCE, and load-time generation of
46 ;;; optimized instance constructor functions.
48 ;;; ********************
49 ;;; Entry Points ******
50 ;;; ********************
52 ;;; UPDATE-CTORS must be called when methods are added/removed,
53 ;;; classes are changed, etc., which affect instance creation.
55 ;;; PRECOMPILE-CTORS can be called to precompile constructor functions
56 ;;; for classes whose definitions are known at the time the function
61 ;;; ******************
63 ;;; ******************
65 (defun quote-plist-keys (plist)
66 (loop for (key . more) on plist by #'cddr
68 (error "Not a property list: ~S" plist)
71 and collect (car more)))
73 (defun plist-keys (plist &key test)
74 (loop for (key . more) on plist by #'cddr
76 (error "Not a property list: ~S" plist)
77 else if (or (null test) (funcall test key))
80 (defun plist-values (plist &key test)
81 (loop for (key . more) on plist by #'cddr
83 (error "Not a property list: ~S" plist)
84 else if (or (null test) (funcall test (car more)))
87 (defun constant-class-arg-p (form)
89 (let ((constant (constant-form-value form)))
90 (or (and (symbolp constant)
91 (not (null (symbol-package constant))))
94 (defun constant-symbol-p (form)
96 (let ((constant (constant-form-value form)))
97 (and (symbolp constant)
98 (not (null (symbol-package constant)))))))
100 ;;; somewhat akin to DEFAULT-INITARGS (SLOT-CLASS T T), but just
101 ;;; collecting the defaulted initargs for the call.
102 (defun ctor-default-initkeys (supplied-initargs class-default-initargs)
103 (loop for (key) in class-default-initargs
104 when (eq (getf supplied-initargs key '.not-there.) '.not-there.)
107 ;;; *****************
109 ;;; *****************
111 ;;; Ctors are funcallable instances whose initial function is a
112 ;;; function computing an optimized constructor function when called.
113 ;;; When the optimized function is computed, the function of the
114 ;;; funcallable instance is set to it.
116 (!defstruct-with-alternate-metaclass ctor
117 :slot-names (function-name class-or-name class initargs safe-p)
118 :boa-constructor %make-ctor
119 :superclass-name function
120 :metaclass-name static-classoid
121 :metaclass-constructor make-static-classoid
122 :dd-type funcallable-structure
123 :runtime-type-checks-p nil)
125 ;;; List of all defined ctors.
126 (defvar *all-ctors* ())
128 (defun make-ctor-parameter-list (ctor)
129 (plist-values (ctor-initargs ctor) :test (complement #'constantp)))
131 ;;; Reset CTOR to use a default function that will compute an
132 ;;; optimized constructor function when called.
133 (defun install-initial-constructor (ctor &key force-p)
134 (when (or force-p (ctor-class ctor))
135 (setf (ctor-class ctor) nil)
136 (setf (funcallable-instance-fun ctor)
137 #'(lambda (&rest args)
138 (install-optimized-constructor ctor)
140 (setf (%funcallable-instance-info ctor 1)
141 (ctor-function-name ctor))))
143 (defun make-ctor-function-name (class-name initargs safe-code-p)
144 (list* 'ctor class-name safe-code-p initargs))
146 ;;; Keep this a separate function for testing.
147 (defun ensure-ctor (function-name class-name initargs safe-code-p)
148 (unless (fboundp function-name)
149 (make-ctor function-name class-name initargs safe-code-p)))
151 ;;; Keep this a separate function for testing.
152 (defun make-ctor (function-name class-name initargs safe-p)
153 (without-package-locks ; for (setf symbol-function)
154 (let ((ctor (%make-ctor function-name class-name nil initargs safe-p)))
155 (push ctor *all-ctors*)
156 (setf (fdefinition function-name) ctor)
157 (install-initial-constructor ctor :force-p t)
160 ;;; *****************
161 ;;; Inline CTOR cache
162 ;;; *****************
164 ;;; The cache starts out as a list of CTORs, sorted with the most recently
165 ;;; used CTORs near the head. If it expands too much, we switch to a vector
166 ;;; with a simple hashing scheme.
168 ;;; Find CTOR for KEY (which is a class or class name) in a list. If the CTOR
169 ;;; is in the list but not one of the 4 first ones, return a new list with the
170 ;;; found CTOR at the head. Thread-safe: the new list shares structure with
171 ;;; the old, but is not desctructively modified. Returning the old list for
172 ;;; hits close to the head reduces ping-ponging with multiple threads seeking
174 (defun find-ctor (key list)
175 (labels ((walk (tail from-head depth)
176 (declare (fixnum depth))
178 (let ((ctor (car tail)))
179 (if (eq (ctor-class-or-name ctor) key)
182 (nconc (list ctor) (nreverse from-head) (cdr tail)))
186 (cons ctor from-head)
187 (logand #xf (1+ depth)))))
191 (declaim (inline sxhash-symbol-or-class))
192 (defun sxhash-symbol-or-class (x)
193 (cond ((symbolp x) (sxhash x))
194 ((std-instance-p x) (std-instance-hash x))
195 ((fsc-instance-p x) (fsc-instance-hash x))
197 (bug "Something strange where symbol or class expected."))))
199 ;;; Max number of CTORs kept in an inline list cache. Once this is
200 ;;; exceeded we switch to a table.
201 (defconstant +ctor-list-max-size+ 12)
202 ;;; Max table size for CTOR cache. If the table fills up at this size
203 ;;; we keep the same size and drop 50% of the old entries.
204 (defconstant +ctor-table-max-size+ (expt 2 8))
205 ;;; Even if there is space in the cache, if we cannot fit a new entry
206 ;;; with max this number of collisions we expand the table (if possible)
208 (defconstant +ctor-table-max-probe-depth+ 5)
210 (defun make-ctor-table (size)
211 (declare (index size))
212 (let ((real-size (power-of-two-ceiling size)))
213 (if (< real-size +ctor-table-max-size+)
214 (values (make-array real-size :initial-element nil) nil)
215 (values (make-array +ctor-table-max-size+ :initial-element nil) t))))
217 (declaim (inline mix-ctor-hash))
218 (defun mix-ctor-hash (hash base)
219 (logand most-positive-fixnum (+ hash base 1)))
221 (defun put-ctor (ctor table)
222 (cond ((try-put-ctor ctor table)
225 (expand-ctor-table ctor table))))
227 ;;; Thread-safe: if two threads write to the same index in parallel, the other
228 ;;; result is just lost. This is not an issue as the CTORs are used as their
229 ;;; own keys. If both were EQ, we're good. If non-EQ, the next time the other
230 ;;; one is needed we just cache it again -- hopefully not getting stomped on
232 (defun try-put-ctor (ctor table)
233 (declare (simple-vector table) (optimize speed))
234 (let* ((class (ctor-class-or-name ctor))
235 (base (sxhash-symbol-or-class class))
237 (mask (1- (length table))))
238 (declare (fixnum base hash mask))
239 (loop repeat +ctor-table-max-probe-depth+
240 do (let* ((index (logand mask hash))
241 (old (aref table index)))
242 (cond ((and old (neq class (ctor-class-or-name old)))
243 (setf hash (mix-ctor-hash hash base)))
245 (setf (aref table index) ctor)
246 (return-from try-put-ctor t)))))
247 ;; Didn't fit, must expand
250 (defun get-ctor (class table)
251 (declare (simple-vector table) (optimize speed))
252 (let* ((base (sxhash-symbol-or-class class))
254 (mask (1- (length table))))
255 (declare (fixnum base hash mask))
256 (loop repeat +ctor-table-max-probe-depth+
257 do (let* ((index (logand mask hash))
258 (old (aref table index)))
259 (if (and old (eq class (ctor-class-or-name old)))
260 (return-from get-ctor old)
261 (setf hash (mix-ctor-hash hash base)))))
265 ;;; Thread safe: the old table is read, but if another thread mutates
266 ;;; it while we're reading we still get a sane result -- either the old
267 ;;; or the new entry. The new table is locally allocated, so that's ok
269 (defun expand-ctor-table (ctor old)
270 (declare (simple-vector old))
271 (let* ((old-size (length old))
272 (new-size (* 2 old-size))
273 (drop-random-entries nil))
276 (multiple-value-bind (new max-size-p) (make-ctor-table new-size)
277 (let ((action (if drop-random-entries
278 ;; Same logic as in method caches -- see comment
280 (randomly-punting-lambda (old-ctor)
281 (try-put-ctor old-ctor new))
283 (unless (try-put-ctor old-ctor new)
285 (setf drop-random-entries t)
286 (setf new-size (* 2 new-size)))
288 (aver (try-put-ctor ctor new))
289 (dotimes (i old-size)
290 (let ((old-ctor (aref old i)))
292 (funcall action old-ctor))))
293 (return-from expand-ctor-table (values ctor new)))))))
295 (defun ctor-list-to-table (list)
296 (let ((table (make-ctor-table (length list))))
298 (setf table (nth-value 1 (put-ctor ctor table))))
301 (defun ctor-for-caching (class-name initargs safe-code-p)
302 (let ((name (make-ctor-function-name class-name initargs safe-code-p)))
303 (or (ensure-ctor name class-name initargs safe-code-p)
304 (fdefinition name))))
306 (defun ensure-cached-ctor (class-name store initargs safe-code-p)
308 (multiple-value-bind (ctor list) (find-ctor class-name store)
311 (let ((ctor (ctor-for-caching class-name initargs safe-code-p)))
312 (if (< (length list) +ctor-list-max-size+)
313 (values ctor (cons ctor list))
314 (values ctor (ctor-list-to-table list))))))
315 (let ((ctor (get-ctor class-name store)))
318 (put-ctor (ctor-for-caching class-name initargs safe-code-p)
321 ;;; ***********************************************
322 ;;; Compile-Time Expansion of MAKE-INSTANCE *******
323 ;;; ***********************************************
325 (defvar *compiling-optimized-constructor* nil)
327 (define-compiler-macro make-instance (&whole form &rest args &environment env)
328 (declare (ignore args))
329 ;; Compiling an optimized constructor for a non-standard class means compiling a
330 ;; lambda with (MAKE-INSTANCE #<SOME-CLASS X> ...) in it -- need
331 ;; to make sure we don't recurse there.
332 (or (unless *compiling-optimized-constructor*
333 (make-instance->constructor-call form (safe-code-p env)))
336 (defun make-instance->constructor-call (form safe-code-p)
337 (destructuring-bind (class-arg &rest args) (cdr form)
339 ;; Return the name of parameter number I of a constructor
342 (let ((ps #(.p0. .p1. .p2. .p3. .p4. .p5.)))
343 (if (array-in-bounds-p ps i)
345 (format-symbol *pcl-package* ".P~D." i))))
346 ;; Check if CLASS-ARG is a constant symbol. Give up if
349 (and class-arg (constant-class-arg-p class-arg)))
350 ;; Check if ARGS are suitable for an optimized constructor.
351 ;; Return NIL from the outer function if not.
353 (loop for (key . more) on args by #'cddr do
354 (when (or (null more)
355 (not (constant-symbol-p key))
356 (eq :allow-other-keys (constant-form-value key)))
357 (return-from make-instance->constructor-call nil)))))
359 ;; Collect a plist of initargs and constant values/parameter names
360 ;; in INITARGS. Collect non-constant initialization forms in
362 (multiple-value-bind (initargs value-forms)
363 (loop for (key value) on args by #'cddr and i from 0
364 collect (constant-form-value key) into initargs
366 collect value into initargs
368 collect (parameter-name i) into initargs
369 and collect value into value-forms
371 (return (values initargs value-forms)))
372 (if (constant-class-p)
373 (let* ((class-or-name (constant-form-value class-arg))
374 (function-name (make-ctor-function-name class-or-name initargs
376 ;; Prevent compiler warnings for calling the ctor.
377 (proclaim-as-fun-name function-name)
378 (note-name-defined function-name :function)
379 (when (eq (info :function :where-from function-name) :assumed)
380 (setf (info :function :where-from function-name) :defined)
381 (when (info :function :assumed-type function-name)
382 (setf (info :function :assumed-type function-name) nil)))
383 ;; Return code constructing a ctor at load time, which, when
384 ;; called, will set its funcallable instance function to an
385 ;; optimized constructor function.
387 (declare (disable-package-locks ,function-name))
388 (let ((.x. (load-time-value
389 (ensure-ctor ',function-name ',class-or-name ',initargs
391 (declare (ignore .x.))
392 ;; ??? check if this is worth it.
394 (ftype (or (function ,(make-list (length value-forms)
397 (function (&rest t) t))
399 (funcall (function ,function-name) ,@value-forms))))
401 ;; Build an inline cache: a CONS, with the actual cache in the CDR.
402 `(locally (declare (disable-package-locks .cache. .class-arg. .store. .fun.
404 (let* ((.cache. (load-time-value (cons 'ctor-cache nil)))
405 (.store. (cdr .cache.))
406 (.class-arg. ,class-arg))
407 (multiple-value-bind (.fun. .new-store.)
408 (ensure-cached-ctor .class-arg. .store. ',initargs ',safe-code-p)
409 ;; Thread safe: if multiple threads hit this in paralle, the update
410 ;; from the other one is just lost -- no harm done, except for the
411 ;; need to redo the work next time.
412 (unless (eq .store. .new-store.)
413 (setf (cdr .cache.) .new-store.))
414 (funcall (truly-the function .fun.) ,@value-forms))))))))))
416 ;;; **************************************************
417 ;;; Load-Time Constructor Function Generation *******
418 ;;; **************************************************
420 ;;; The system-supplied primary INITIALIZE-INSTANCE and
421 ;;; SHARED-INITIALIZE methods. One cannot initialize these variables
422 ;;; to the right values here because said functions don't exist yet
423 ;;; when this file is first loaded.
424 (defvar *the-system-ii-method* nil)
425 (defvar *the-system-si-method* nil)
427 (defun install-optimized-constructor (ctor)
429 (let* ((class-or-name (ctor-class-or-name ctor))
430 (class (if (symbolp class-or-name)
431 (find-class class-or-name)
433 (unless (class-finalized-p class)
434 (finalize-inheritance class))
435 ;; We can have a class with an invalid layout here. Such a class
436 ;; cannot have a LAYOUT-INVALID of (:FLUSH ...) or (:OBSOLETE
437 ;; ...), because part of the deal is that those only happen from
438 ;; FORCE-CACHE-FLUSHES, which create a new valid wrapper for the
439 ;; class. An invalid layout of T needs to be flushed, however.
440 (when (eq (layout-invalid (class-wrapper class)) t)
441 (%force-cache-flushes class))
442 (setf (ctor-class ctor) class)
443 (pushnew ctor (plist-value class 'ctors) :test #'eq)
444 (setf (funcallable-instance-fun ctor)
445 (multiple-value-bind (form locations names)
446 (constructor-function-form ctor)
448 (let ((*compiling-optimized-constructor* t))
449 (handler-bind ((compiler-note #'muffle-warning))
450 (compile nil `(lambda ,names ,form))))
453 (defun constructor-function-form (ctor)
454 (let* ((class (ctor-class ctor))
455 (proto (class-prototype class))
456 (make-instance-methods
457 (compute-applicable-methods #'make-instance (list class)))
458 (allocate-instance-methods
459 (compute-applicable-methods #'allocate-instance (list class)))
460 ;; I stared at this in confusion for a while, thinking
461 ;; carefully about the possibility of the class prototype not
462 ;; being of sufficient discrimiating power, given the
463 ;; possibility of EQL-specialized methods on
464 ;; INITIALIZE-INSTANCE or SHARED-INITIALIZE. However, given
465 ;; that this is a constructor optimization, the user doesn't
466 ;; yet have the instance to create a method with such an EQL
469 ;; There remains the (theoretical) possibility of someone
470 ;; coming along with code of the form
472 ;; (defmethod initialize-instance :before ((o foo) ...)
473 ;; (eval `(defmethod shared-initialize :before ((o foo) ...) ...)))
475 ;; but probably we can afford not to worry about this too
476 ;; much for now. -- CSR, 2004-07-12
478 (compute-applicable-methods #'initialize-instance (list proto)))
480 (compute-applicable-methods #'shared-initialize (list proto t)))
481 (setf-svuc-slots-methods
482 (loop for slot in (class-slots class)
483 collect (compute-applicable-methods
484 #'(setf slot-value-using-class)
485 (list nil class proto slot))))
487 (loop for slot in (class-slots class)
488 collect (compute-applicable-methods
489 #'slot-boundp-using-class
490 (list class proto slot)))))
491 ;; Cannot initialize these variables earlier because the generic
492 ;; functions don't exist when PCL is built.
493 (when (null *the-system-si-method*)
494 (setq *the-system-si-method*
495 (find-method #'shared-initialize
496 () (list *the-class-slot-object* *the-class-t*)))
497 (setq *the-system-ii-method*
498 (find-method #'initialize-instance
499 () (list *the-class-slot-object*))))
500 ;; Note that when there are user-defined applicable methods on
501 ;; MAKE-INSTANCE and/or ALLOCATE-INSTANCE, these will show up
502 ;; together with the system-defined ones in what
503 ;; COMPUTE-APPLICABLE-METHODS returns.
504 (let ((maybe-invalid-initargs
508 (ctor-default-initkeys
509 (ctor-initargs ctor) (class-default-initargs class))
510 (plist-keys (ctor-initargs ctor)))
511 (append ii-methods si-methods) nil nil))
512 (custom-make-instance
513 (not (null (cdr make-instance-methods)))))
514 (if (and (not (structure-class-p class))
515 (not (condition-class-p class))
516 (not custom-make-instance)
517 (null (cdr allocate-instance-methods))
519 (member (slot-definition-allocation x)
520 '(:instance :class)))
522 (not maybe-invalid-initargs)
523 (not (around-or-nonstandard-primary-method-p
524 ii-methods *the-system-ii-method*))
525 (not (around-or-nonstandard-primary-method-p
526 si-methods *the-system-si-method*))
527 ;; the instance structure protocol goes through
528 ;; slot-value(-using-class) and friends (actually just
529 ;; (SETF SLOT-VALUE-USING-CLASS) and
530 ;; SLOT-BOUNDP-USING-CLASS), so if there are non-standard
531 ;; applicable methods we can't shortcircuit them.
532 (every (lambda (x) (= (length x) 1)) setf-svuc-slots-methods)
533 (every (lambda (x) (= (length x) 1)) sbuc-slots-methods))
534 (optimizing-generator ctor ii-methods si-methods)
535 (fallback-generator ctor ii-methods si-methods
536 (or maybe-invalid-initargs custom-make-instance))))))
538 (defun around-or-nonstandard-primary-method-p
539 (methods &optional standard-method)
540 (loop with primary-checked-p = nil
541 for method in methods
542 as qualifiers = (if (consp method)
543 (early-method-qualifiers method)
544 (safe-method-qualifiers method))
545 when (or (eq :around (car qualifiers))
546 (and (null qualifiers)
547 (not primary-checked-p)
548 (not (null standard-method))
549 (not (eq standard-method method))))
551 when (null qualifiers) do
552 (setq primary-checked-p t)))
554 (defun fallback-generator (ctor ii-methods si-methods use-make-instance)
555 (declare (ignore ii-methods si-methods))
556 (let ((class (ctor-class ctor))
557 (lambda-list (make-ctor-parameter-list ctor))
558 (initargs (quote-plist-keys (ctor-initargs ctor))))
559 (if use-make-instance
560 `(lambda ,lambda-list
561 (declare #.*optimize-speed*)
562 ;; The CTOR MAKE-INSTANCE optimization checks for
563 ;; *COMPILING-OPTIMIZED-CONSTRUCTOR* which is bound around compilation of
564 ;; the constructor, hence avoiding the possibility of endless recursion.
565 (make-instance ,class ,@initargs))
566 (let ((defaults (class-default-initargs class)))
568 (setf initargs (default-initargs initargs defaults)))
569 `(lambda ,lambda-list
570 (declare #.*optimize-speed*)
571 (fast-make-instance ,class ,@initargs))))))
573 ;;; Not as good as the real optimizing generator, but faster than going
574 ;;; via MAKE-INSTANCE: 1 GF call less, and no need to check initargs.
575 (defun fast-make-instance (class &rest initargs)
576 (declare #.*optimize-speed*)
577 (declare (dynamic-extent initargs))
578 (let ((.instance. (apply #'allocate-instance class initargs)))
579 (apply #'initialize-instance .instance. initargs)
582 (defun optimizing-generator (ctor ii-methods si-methods)
583 (multiple-value-bind (locations names body before-method-p)
584 (fake-initialization-emf ctor ii-methods si-methods)
585 (let ((wrapper (class-wrapper (ctor-class ctor))))
587 `(lambda ,(make-ctor-parameter-list ctor)
588 (declare #.*optimize-speed*)
590 (when (layout-invalid ,wrapper)
591 (install-initial-constructor ,ctor)
592 (return (funcall ,ctor ,@(make-ctor-parameter-list ctor))))
593 ,(wrap-in-allocate-forms ctor body before-method-p)))
597 ;;; Return a form wrapped around BODY that allocates an instance
598 ;;; constructed by CTOR. BEFORE-METHOD-P set means we have to run
599 ;;; before-methods, in which case we initialize instance slots to
600 ;;; +SLOT-UNBOUND+. The resulting form binds the local variables
601 ;;; .INSTANCE. to the instance, and .SLOTS. to the instance's slot
602 ;;; vector around BODY.
603 (defun wrap-in-allocate-forms (ctor body before-method-p)
604 (let* ((class (ctor-class ctor))
605 (wrapper (class-wrapper class))
606 (allocation-function (raw-instance-allocator class))
607 (slots-fetcher (slots-fetcher class)))
608 (if (eq allocation-function 'allocate-standard-instance)
609 `(let ((.instance. (%make-standard-instance nil
610 (get-instance-hash-code)))
612 ,(layout-length wrapper)
613 ,@(when before-method-p
614 '(:initial-element +slot-unbound+)))))
615 (setf (std-instance-wrapper .instance.) ,wrapper)
616 (setf (std-instance-slots .instance.) .slots.)
619 `(let* ((.instance. (,allocation-function ,wrapper))
620 (.slots. (,slots-fetcher .instance.)))
621 (declare (ignorable .slots.))
625 ;;; Return a form for invoking METHOD with arguments from ARGS. As
626 ;;; can be seen in METHOD-FUNCTION-FROM-FAST-FUNCTION, method
627 ;;; functions look like (LAMBDA (ARGS NEXT-METHODS) ...). We could
628 ;;; call fast method functions directly here, but benchmarks show that
629 ;;; there's no speed to gain, so lets avoid the hair here.
630 (defmacro invoke-method (method args)
631 `(funcall ,(method-function method) ,args ()))
633 ;;; Return a form that is sort of an effective method comprising all
634 ;;; calls to INITIALIZE-INSTANCE and SHARED-INITIALIZE that would
635 ;;; normally have taken place when calling MAKE-INSTANCE.
636 (defun fake-initialization-emf (ctor ii-methods si-methods)
637 (multiple-value-bind (ii-around ii-before ii-primary ii-after)
638 (standard-sort-methods ii-methods)
639 (declare (ignore ii-primary))
640 (multiple-value-bind (si-around si-before si-primary si-after)
641 (standard-sort-methods si-methods)
642 (declare (ignore si-primary))
643 (aver (and (null ii-around) (null si-around)))
644 (let ((initargs (ctor-initargs ctor)))
645 (multiple-value-bind (locations names bindings vars defaulting-initargs body)
646 (slot-init-forms ctor (or ii-before si-before))
651 (declare (ignorable ,@vars))
652 (let (,@(when (or ii-before ii-after)
654 (list .instance. ,@(quote-plist-keys initargs) ,@defaulting-initargs))))
655 ,@(when (or si-before si-after)
657 (list .instance. t ,@(quote-plist-keys initargs) ,@defaulting-initargs)))))
658 ,@(loop for method in ii-before
659 collect `(invoke-method ,method .ii-args.))
660 ,@(loop for method in si-before
661 collect `(invoke-method ,method .si-args.))
663 ,@(loop for method in si-after
664 collect `(invoke-method ,method .si-args.))
665 ,@(loop for method in ii-after
666 collect `(invoke-method ,method .ii-args.))))
667 (or ii-before si-before)))))))
669 ;;; Return four values from APPLICABLE-METHODS: around methods, before
670 ;;; methods, the applicable primary method, and applicable after
671 ;;; methods. Before and after methods are sorted in the order they
673 (defun standard-sort-methods (applicable-methods)
674 (loop for method in applicable-methods
675 as qualifiers = (if (consp method)
676 (early-method-qualifiers method)
677 (safe-method-qualifiers method))
679 collect method into primary
680 else if (eq :around (car qualifiers))
681 collect method into around
682 else if (eq :after (car qualifiers))
683 collect method into after
684 else if (eq :before (car qualifiers))
685 collect method into before
687 (return (values around before (first primary) (reverse after)))))
689 (defmacro with-type-checked ((type safe-p) &body body)
691 ;; To handle FUNCTION types reasonable, we use SAFETY 3 and
692 ;; THE instead of e.g. CHECK-TYPE.
694 (declare (optimize (safety 3)))
695 (the ,type (progn ,@body)))
698 ;;; Return as multiple values bindings for default initialization
699 ;;; arguments, variable names, defaulting initargs and a body for
700 ;;; initializing instance and class slots of an object costructed by
701 ;;; CTOR. The variable .SLOTS. is assumed to bound to the instance's
702 ;;; slot vector. BEFORE-METHOD-P T means before-methods will be
703 ;;; called, which means that 1) other code will initialize instance
704 ;;; slots to +SLOT-UNBOUND+ before the before-methods are run, and
705 ;;; that we have to check if these before-methods have set slots.
706 (defun slot-init-forms (ctor before-method-p)
707 (let* ((class (ctor-class ctor))
708 (initargs (ctor-initargs ctor))
709 (initkeys (plist-keys initargs))
710 (safe-p (ctor-safe-p ctor))
712 (make-array (layout-length (class-wrapper class))
713 :initial-element nil))
716 (defaulting-initargs ())
717 (default-initargs (class-default-initargs class))
719 (compute-initarg-locations
720 class (append initkeys (mapcar #'car default-initargs)))))
721 (labels ((initarg-locations (initarg)
722 (cdr (assoc initarg initarg-locations :test #'eq)))
723 (initializedp (location)
726 (assoc location class-inits :test #'eq))
728 (not (null (aref slot-vector location))))
729 (t (bug "Weird location in ~S" 'slot-init-forms))))
730 (class-init (location kind val type)
731 (aver (consp location))
732 (unless (initializedp location)
733 (push (list location kind val type) class-inits)))
734 (instance-init (location kind val type)
735 (aver (integerp location))
736 (unless (initializedp location)
737 (setf (aref slot-vector location) (list kind val type))))
738 (default-init-var-name (i)
739 (let ((ps #(.d0. .d1. .d2. .d3. .d4. .d5.)))
740 (if (array-in-bounds-p ps i)
742 (format-symbol *pcl-package* ".D~D." i))))
743 (location-var-name (i)
744 (let ((ls #(.l0. .l1. .l2. .l3. .l4. .l5.)))
745 (if (array-in-bounds-p ls i)
747 (format-symbol *pcl-package* ".L~D." i)))))
748 ;; Loop over supplied initargs and values and record which
749 ;; instance and class slots they initialize.
750 (loop for (key value) on initargs by #'cddr
751 as kind = (if (constantp value) 'constant 'param)
752 as locations = (initarg-locations key)
753 do (loop for (location . type) in locations
754 do (if (consp location)
755 (class-init location kind value type)
756 (instance-init location kind value type))))
757 ;; Loop over default initargs of the class, recording
758 ;; initializations of slots that have not been initialized
759 ;; above. Default initargs which are not in the supplied
760 ;; initargs are treated as if they were appended to supplied
761 ;; initargs, that is, their values must be evaluated even
762 ;; if not actually used for initializing a slot.
763 (loop for (key initform initfn) in default-initargs and i from 0
764 unless (member key initkeys :test #'eq)
765 do (let* ((kind (if (constantp initform) 'constant 'var))
766 (init (if (eq kind 'var) initfn initform)))
769 (push (list 'quote key) defaulting-initargs)
770 (push initform defaulting-initargs))
772 (push (list 'quote key) defaulting-initargs)
773 (push (default-init-var-name i) defaulting-initargs)))
775 (let ((init-var (default-init-var-name i)))
777 (push (cons init-var initfn) default-inits)))
778 (loop for (location . type) in (initarg-locations key)
779 do (if (consp location)
780 (class-init location kind init type)
781 (instance-init location kind init type)))))
782 ;; Loop over all slots of the class, filling in the rest from
784 (loop for slotd in (class-slots class)
785 as location = (slot-definition-location slotd)
786 as type = (slot-definition-type slotd)
787 as allocation = (slot-definition-allocation slotd)
788 as initfn = (slot-definition-initfunction slotd)
789 as initform = (slot-definition-initform slotd) do
790 (unless (or (eq allocation :class)
792 (initializedp location))
793 (if (constantp initform)
794 (instance-init location 'initform initform type)
795 (instance-init location 'initform/initfn initfn type))))
796 ;; Generate the forms for initializing instance and class slots.
797 (let ((instance-init-forms
798 (loop for slot-entry across slot-vector and i from 0
799 as (kind value type) = slot-entry collect
802 (unless before-method-p
803 `(setf (clos-slots-ref .slots. ,i) +slot-unbound+)))
805 `(setf (clos-slots-ref .slots. ,i)
806 (with-type-checked (,type ,safe-p)
809 `(setf (clos-slots-ref .slots. ,i)
810 (with-type-checked (,type ,safe-p)
814 `(when (eq (clos-slots-ref .slots. ,i)
816 (setf (clos-slots-ref .slots. ,i)
817 (with-type-checked (,type ,safe-p)
819 `(setf (clos-slots-ref .slots. ,i)
820 (with-type-checked (,type ,safe-p)
824 `(when (eq (clos-slots-ref .slots. ,i)
826 (setf (clos-slots-ref .slots. ,i)
827 (with-type-checked (,type ,safe-p)
828 ',(constant-form-value value))))
829 `(setf (clos-slots-ref .slots. ,i)
830 (with-type-checked (,type ,safe-p)
831 ',(constant-form-value value)))))
833 `(setf (clos-slots-ref .slots. ,i)
834 (with-type-checked (,type ,safe-p)
835 ',(constant-form-value value))))))))
836 ;; we are not allowed to modify QUOTEd locations, so we can't
837 ;; generate code like (setf (cdr ',location) arg). Instead,
838 ;; we have to do (setf (cdr .L0.) arg) and arrange for .L0. to
839 ;; be bound to the location.
840 (multiple-value-bind (names locations class-init-forms)
841 (loop for (location kind value type) in class-inits
843 for name = (location-var-name i)
844 collect name into names
845 collect location into locations
846 collect `(setf (cdr ,name)
847 (with-type-checked (,type ,safe-p)
849 (constant `',(constant-form-value value))
850 ((param var) `,value)
851 (initfn `(funcall ,value)))))
852 into class-init-forms
853 finally (return (values names locations class-init-forms)))
854 (multiple-value-bind (vars bindings)
855 (loop for (var . initfn) in (nreverse default-inits)
856 collect var into vars
857 collect `(,var (funcall ,initfn)) into bindings
858 finally (return (values vars bindings)))
859 (values locations names
861 (nreverse defaulting-initargs)
862 `(,@(delete nil instance-init-forms)
863 ,@class-init-forms))))))))
865 ;;; Return an alist of lists (KEY (LOCATION . TYPE-SPECIFIER) ...)
866 ;;; telling, for each key in INITKEYS, which locations the initarg
867 ;;; initializes and the associated type with the location. CLASS is
868 ;;; the class of the instance being initialized.
869 (defun compute-initarg-locations (class initkeys)
870 (loop with slots = (class-slots class)
871 for key in initkeys collect
872 (loop for slot in slots
873 if (memq key (slot-definition-initargs slot))
874 collect (cons (slot-definition-location slot)
875 (slot-definition-type slot))
878 collect slot into remaining-slots
880 (setq slots remaining-slots)
881 (return (cons key locations)))))
884 ;;; *******************************
885 ;;; External Entry Points ********
886 ;;; *******************************
888 (defun update-ctors (reason &key class name generic-function method)
889 (labels ((reset (class &optional ri-cache-p (ctorsp t))
891 (dolist (ctor (plist-value class 'ctors))
892 (install-initial-constructor ctor)))
894 (setf (plist-value class 'ri-initargs) ()))
895 (dolist (subclass (class-direct-subclasses class))
896 (reset subclass ri-cache-p ctorsp))))
898 ;; CLASS must have been specified.
899 (finalize-inheritance
901 ;; NAME must have been specified.
903 (loop for ctor in *all-ctors*
904 when (eq (ctor-class-or-name ctor) name) do
905 (when (ctor-class ctor)
906 (reset (ctor-class ctor)))
908 ;; GENERIC-FUNCTION and METHOD must have been specified.
909 ((add-method remove-method)
910 (flet ((class-of-1st-method-param (method)
911 (type-class (first (method-specializers method)))))
912 (case (generic-function-name generic-function)
913 ((make-instance allocate-instance
914 initialize-instance shared-initialize)
915 (reset (class-of-1st-method-param method) t t))
916 ((reinitialize-instance)
917 (reset (class-of-1st-method-param method) t nil))
918 (t (when (or (eq (generic-function-name generic-function)
919 'slot-boundp-using-class)
920 (equal (generic-function-name generic-function)
921 '(setf slot-value-using-class)))
922 ;; this looks awfully expensive, but given that one
923 ;; can specialize on the SLOTD argument, nothing is
924 ;; safe. -- CSR, 2004-07-12
925 (reset (find-class 'standard-object))))))))))
927 (defun precompile-ctors ()
928 (dolist (ctor *all-ctors*)
929 (when (null (ctor-class ctor))
930 (let ((class (find-class (ctor-class-or-name ctor) nil)))
931 (when (and class (class-finalized-p class))
932 (install-optimized-constructor ctor))))))
934 (defun check-ri-initargs (instance initargs)
935 (let* ((class (class-of instance))
936 (keys (plist-keys initargs))
937 (cached (assoc keys (plist-value class 'ri-initargs)
943 ;; FIXME: give CHECK-INITARGS-1 and friends a
944 ;; more mnemonic name and (possibly) a nicer,
945 ;; more orthogonal interface.
948 (list (list* 'reinitialize-instance instance initargs)
949 (list* 'shared-initialize instance nil initargs))
951 (setf (plist-value class 'ri-initargs)
952 (acons keys invalid cached))
955 (error 'initarg-error :class class :initargs invalid-keys))))