1 ;;;; that part of DEFSTRUCT implementation which is needed not just
2 ;;;; in the target Lisp but also in the cross-compilation host
4 ;;;; This software is part of the SBCL system. See the README file for
7 ;;;; This software is derived from the CMU CL system, which was
8 ;;;; written at Carnegie Mellon University and released into the
9 ;;;; public domain. The software is in the public domain and is
10 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
11 ;;;; files for more information.
13 (in-package "SB!KERNEL")
15 (/show0 "code/defstruct.lisp 15")
19 ;;; Return the compiler layout for NAME. (The class referred to by
20 ;;; NAME must be a structure-like class.)
21 (defun compiler-layout-or-lose (name)
22 (let ((res (info :type :compiler-layout name)))
24 (error "Class is not yet defined or was undefined: ~S" name))
25 ((not (typep (layout-info res) 'defstruct-description))
26 (error "Class is not a structure class: ~S" name))
29 (defun compiler-layout-ready-p (name)
30 (let ((layout (info :type :compiler-layout name)))
31 (and layout (typep (layout-info layout) 'defstruct-description))))
33 (sb!xc:defmacro %make-structure-instance-macro (dd slot-specs &rest slot-vars)
34 (if (compiler-layout-ready-p (dd-name dd))
35 `(truly-the ,(dd-name dd)
36 (%make-structure-instance ,dd ,slot-specs ,@slot-vars))
37 ;; Non-toplevel defstructs don't have a layout at compile time,
38 ;; so we need to construct the actual function at runtime -- but
39 ;; we cache it at the call site, so that we don't perform quite
41 `(let* ((cell (load-time-value (list nil)))
44 (funcall fun ,@slot-vars)
45 (funcall (setf (car cell)
46 (%make-structure-instance-allocator ,dd ,slot-specs))
49 (declaim (ftype (sfunction (defstruct-description list) function)
50 %make-structure-instance-allocator))
51 (defun %make-structure-instance-allocator (dd slot-specs)
52 (let ((vars (make-gensym-list (length slot-specs))))
53 (values (compile nil `(lambda (,@vars)
54 (%make-structure-instance-macro ,dd ',slot-specs ,@vars))))))
56 (defun %make-funcallable-structure-instance-allocator (dd slot-specs)
58 (bug "funcallable-structure-instance allocation with slots unimplemented"))
59 (let ((name (dd-name dd))
60 (length (dd-length dd))
61 (nobject (gensym "OBJECT")))
63 (compile nil `(lambda ()
64 (let ((,nobject (%make-funcallable-instance ,length)))
65 (setf (%funcallable-instance-layout ,nobject)
66 (%delayed-get-compiler-layout ,name))
69 ;;; Delay looking for compiler-layout until the constructor is being
70 ;;; compiled, since it doesn't exist until after the EVAL-WHEN
71 ;;; (COMPILE) stuff is compiled. (Or, in the oddball case when
72 ;;; DEFSTRUCT is executing in a non-toplevel context, the
73 ;;; compiler-layout still doesn't exist at compilation time, and we
74 ;;; delay still further.)
75 (sb!xc:defmacro %delayed-get-compiler-layout (name)
76 (let ((layout (info :type :compiler-layout name)))
78 ;; ordinary case: When the DEFSTRUCT is at top level,
79 ;; then EVAL-WHEN (COMPILE) stuff will have set up the
80 ;; layout for us to use.
81 (unless (typep (layout-info layout) 'defstruct-description)
82 (error "Class is not a structure class: ~S" name))
85 ;; KLUDGE: In the case that DEFSTRUCT is not at top-level
86 ;; the layout doesn't exist at compile time. In that case
87 ;; we laboriously look it up at run time. This code will
88 ;; run on every constructor call and will likely be quite
89 ;; slow, so if anyone cares about performance of
90 ;; non-toplevel DEFSTRUCTs, it should be rewritten to be
91 ;; cleverer. -- WHN 2002-10-23
93 "implementation limitation: ~
94 Non-toplevel DEFSTRUCT constructors are slow.")
95 (with-unique-names (layout)
96 `(let ((,layout (info :type :compiler-layout ',name)))
97 (unless (typep (layout-info ,layout) 'defstruct-description)
98 (error "Class is not a structure class: ~S" ',name))
101 ;;; re. %DELAYED-GET-COMPILER-LAYOUT and COMPILE-TIME-FIND-LAYOUT, above..
103 ;;; FIXME: Perhaps both should be defined with DEFMACRO-MUNDANELY?
104 ;;; FIXME: Do we really need both? If so, their names and implementations
105 ;;; should probably be tweaked to be more parallel.
107 ;;;; DEFSTRUCT-DESCRIPTION
109 ;;; The DEFSTRUCT-DESCRIPTION structure holds compile-time information
110 ;;; about a structure type.
111 (def!struct (defstruct-description
113 (:make-load-form-fun just-dump-it-normally)
114 #-sb-xc-host (:pure t)
115 (:constructor make-defstruct-description
117 (conc-name (symbolicate name "-"))
118 (copier-name (symbolicate "COPY-" name))
119 (predicate-name (symbolicate name "-P")))))
120 ;; name of the structure
121 (name (missing-arg) :type symbol :read-only t)
122 ;; documentation on the structure
123 (doc nil :type (or string null))
124 ;; prefix for slot names. If NIL, none.
125 (conc-name nil :type (or symbol null))
126 ;; the name of the primary standard keyword constructor, or NIL if none
127 (default-constructor nil :type (or symbol null))
128 ;; all the explicit :CONSTRUCTOR specs, with name defaulted
129 (constructors () :type list)
130 ;; name of copying function
131 (copier-name nil :type (or symbol null))
132 ;; name of type predicate
133 (predicate-name nil :type (or symbol null))
134 ;; the arguments to the :INCLUDE option, or NIL if no included
136 (include nil :type list)
137 ;; properties used to define structure-like classes with an
138 ;; arbitrary superclass and that may not have STRUCTURE-CLASS as the
139 ;; metaclass. Syntax is:
140 ;; (superclass-name metaclass-name metaclass-constructor)
141 (alternate-metaclass nil :type list)
142 ;; a list of DEFSTRUCT-SLOT-DESCRIPTION objects for all slots
143 ;; (including included ones)
144 (slots () :type list)
145 ;; a list of (NAME . INDEX) pairs for accessors of included structures
146 (inherited-accessor-alist () :type list)
147 ;; number of elements we've allocated (See also RAW-LENGTH, which is not
148 ;; included in LENGTH.)
149 (length 0 :type index)
150 ;; General kind of implementation.
151 (type 'structure :type (member structure vector list
152 funcallable-structure))
154 ;; The next three slots are for :TYPE'd structures (which aren't
155 ;; classes, DD-CLASS-P = NIL)
157 ;; vector element type
159 ;; T if :NAMED was explicitly specified, NIL otherwise
160 (named nil :type boolean)
161 ;; any INITIAL-OFFSET option on this direct type
162 (offset nil :type (or index null))
164 ;; the argument to the PRINT-FUNCTION option, or NIL if a
165 ;; PRINT-FUNCTION option was given with no argument, or 0 if no
166 ;; PRINT-FUNCTION option was given
167 (print-function 0 :type (or cons symbol (member 0)))
168 ;; the argument to the PRINT-OBJECT option, or NIL if a PRINT-OBJECT
169 ;; option was given with no argument, or 0 if no PRINT-OBJECT option
171 (print-object 0 :type (or cons symbol (member 0)))
172 ;; The number of untagged slots at the end.
173 (raw-length 0 :type index)
174 ;; the value of the :PURE option, or :UNSPECIFIED. This is only
175 ;; meaningful if DD-CLASS-P = T.
176 (pure :unspecified :type (member t nil :substructure :unspecified)))
177 (def!method print-object ((x defstruct-description) stream)
178 (print-unreadable-object (x stream :type t)
179 (prin1 (dd-name x) stream)))
181 ;;; Does DD describe a structure with a class?
182 (defun dd-class-p (dd)
184 '(structure funcallable-structure)))
186 ;;; a type name which can be used when declaring things which operate
187 ;;; on structure instances
188 (defun dd-declarable-type (dd)
190 ;; Native classes are known to the type system, and we can
191 ;; declare them as types.
193 ;; Structures layered on :TYPE LIST or :TYPE VECTOR aren't part
194 ;; of the type system, so all we can declare is the underlying
195 ;; LIST or VECTOR type.
198 (defun dd-layout-or-lose (dd)
199 (compiler-layout-or-lose (dd-name dd)))
201 ;;;; DEFSTRUCT-SLOT-DESCRIPTION
203 ;;; A DEFSTRUCT-SLOT-DESCRIPTION holds compile-time information about
204 ;;; a structure slot.
205 (def!struct (defstruct-slot-description
206 (:make-load-form-fun just-dump-it-normally)
209 #-sb-xc-host (:pure t))
212 ;; its position in the implementation sequence
213 (index (missing-arg) :type fixnum)
214 ;; the name of the accessor function
216 ;; (CMU CL had extra complexity here ("..or NIL if this accessor has
217 ;; the same name as an inherited accessor (which we don't want to
218 ;; shadow)") but that behavior doesn't seem to be specified by (or
219 ;; even particularly consistent with) ANSI, so it's gone in SBCL.)
221 default ; default value expression
222 (type t) ; declared type specifier
223 (safe-p t :type boolean) ; whether the slot is known to be
224 ; always of the specified type
225 ;; If this object does not describe a raw slot, this value is T.
227 ;; If this object describes a raw slot, this value is the type of the
228 ;; value that the raw slot holds.
229 (raw-type t :type (member t single-float double-float
230 #!+long-float long-float
231 complex-single-float complex-double-float
232 #!+long-float complex-long-float
234 (read-only nil :type (member t nil)))
235 (def!method print-object ((x defstruct-slot-description) stream)
236 (print-unreadable-object (x stream :type t)
237 (prin1 (dsd-name x) stream)))
239 ;;;; typed (non-class) structures
241 ;;; Return a type specifier we can use for testing :TYPE'd structures.
242 (defun dd-lisp-type (defstruct)
243 (ecase (dd-type defstruct)
245 (vector `(simple-array ,(dd-element-type defstruct) (*)))))
247 ;;;; shared machinery for inline and out-of-line slot accessor functions
249 ;;; Classic comment preserved for entertainment value:
251 ;;; "A lie can travel halfway round the world while the truth is
252 ;;; putting on its shoes." -- Mark Twain
254 (eval-when (#-sb-xc :compile-toplevel :load-toplevel :execute)
256 ;; information about how a slot of a given DSD-RAW-TYPE is to be accessed
257 (defstruct (raw-slot-data
260 ;; the raw slot type, or T for a non-raw slot
262 ;; (Non-raw slots are in the ordinary place you'd expect, directly
263 ;; indexed off the instance pointer. Raw slots are indexed from the end
264 ;; of the instance and skipped by GC.)
265 (raw-type (missing-arg) :type (or symbol cons) :read-only t)
266 ;; What operator is used to access a slot of this type?
267 (accessor-name (missing-arg) :type symbol :read-only t)
268 (init-vop (missing-arg) :type symbol :read-only t)
269 ;; How many words are each value of this type?
270 (n-words (missing-arg) :type (and index (integer 1)) :read-only t)
271 ;; Necessary alignment in units of words. Note that instances
272 ;; themselves are aligned by exactly two words, so specifying more
273 ;; than two words here would not work.
274 (alignment 1 :type (integer 1 2) :read-only t)
275 (comparer (missing-arg) :type function :read-only t))
277 (defvar *raw-slot-data-list*
278 (macrolet ((make-comparer (accessor-name)
280 (= (,accessor-name x index)
281 (,accessor-name y index)))))
282 (let ((double-float-alignment
283 ;; white list of architectures that can load unaligned doubles:
284 #!+(or x86 x86-64 ppc) 1
285 ;; at least sparc, mips and alpha can't:
286 #!-(or x86 x86-64 ppc) 2))
288 (make-raw-slot-data :raw-type 'sb!vm:word
289 :accessor-name '%raw-instance-ref/word
290 :init-vop 'sb!vm::raw-instance-init/word
292 :comparer (make-comparer %raw-instance-ref/word))
293 (make-raw-slot-data :raw-type 'single-float
294 :accessor-name '%raw-instance-ref/single
295 :init-vop 'sb!vm::raw-instance-init/single
296 ;; KLUDGE: On 64 bit architectures, we
297 ;; could pack two SINGLE-FLOATs into the
298 ;; same word if raw slots were indexed
299 ;; using bytes instead of words. However,
300 ;; I don't personally find optimizing
301 ;; SINGLE-FLOAT memory usage worthwile
302 ;; enough. And the other datatype that
303 ;; would really benefit is (UNSIGNED-BYTE
304 ;; 32), but that is a subtype of FIXNUM, so
305 ;; we store it unraw anyway. :-( -- DFL
307 :comparer (make-comparer %raw-instance-ref/single))
308 (make-raw-slot-data :raw-type 'double-float
309 :accessor-name '%raw-instance-ref/double
310 :init-vop 'sb!vm::raw-instance-init/double
311 :alignment double-float-alignment
312 :n-words (/ 8 sb!vm:n-word-bytes)
313 :comparer (make-comparer %raw-instance-ref/double))
314 (make-raw-slot-data :raw-type 'complex-single-float
315 :accessor-name '%raw-instance-ref/complex-single
316 :init-vop 'sb!vm::raw-instance-init/complex-single
317 :n-words (/ 8 sb!vm:n-word-bytes)
318 :comparer (make-comparer %raw-instance-ref/complex-single))
319 (make-raw-slot-data :raw-type 'complex-double-float
320 :accessor-name '%raw-instance-ref/complex-double
321 :init-vop 'sb!vm::raw-instance-init/complex-double
322 :alignment double-float-alignment
323 :n-words (/ 16 sb!vm:n-word-bytes)
324 :comparer (make-comparer %raw-instance-ref/complex-double))
326 (make-raw-slot-data :raw-type long-float
327 :accessor-name '%raw-instance-ref/long
328 :init-vop 'sb!vm::raw-instance-init/long
329 :n-words #!+x86 3 #!+sparc 4
330 :comparer (make-comparer %raw-instance-ref/long))
332 (make-raw-slot-data :raw-type complex-long-float
333 :accessor-name '%raw-instance-ref/complex-long
334 :init-vop 'sb!vm::raw-instance-init/complex-long
335 :n-words #!+x86 6 #!+sparc 8
336 :comparer (make-comparer %raw-instance-ref/complex-long)))))))
338 (defun raw-slot-words (type)
339 (let ((rsd (find type *raw-slot-data-list* :key #'raw-slot-data-raw-type)))
341 (raw-slot-data-n-words rsd)
342 (error "Invalid raw slot type: ~S" type))))
344 ;;;; the legendary DEFSTRUCT macro itself (both CL:DEFSTRUCT and its
345 ;;;; close personal friend SB!XC:DEFSTRUCT)
347 ;;; Return a list of forms to install PRINT and MAKE-LOAD-FORM funs,
348 ;;; mentioning them in the expansion so that they can be compiled.
349 (defun class-method-definitions (defstruct)
350 (let ((name (dd-name defstruct)))
352 ;; KLUDGE: There's a FIND-CLASS DEFTRANSFORM for constant
353 ;; class names which creates fast but non-cold-loadable,
354 ;; non-compact code. In this context, we'd rather have
355 ;; compact, cold-loadable code. -- WHN 19990928
356 (declare (notinline find-classoid))
357 ,@(let ((pf (dd-print-function defstruct))
358 (po (dd-print-object defstruct))
359 (x (sb!xc:gensym "OBJECT"))
360 (s (sb!xc:gensym "STREAM")))
361 ;; Giving empty :PRINT-OBJECT or :PRINT-FUNCTION options
362 ;; leaves PO or PF equal to NIL. The user-level effect is
363 ;; to generate a PRINT-OBJECT method specialized for the type,
364 ;; implementing the default #S structure-printing behavior.
365 (when (or (eq pf nil) (eq po nil))
366 (setf pf '(default-structure-print)
368 (flet (;; Given an arg from a :PRINT-OBJECT or :PRINT-FUNCTION
369 ;; option, return the value to pass as an arg to FUNCTION.
371 (destructuring-bind (fun-name) oarg
373 (cond ((not (eql pf 0))
374 `((def!method print-object ((,x ,name) ,s)
375 (funcall #',(farg pf)
378 *current-level-in-print*))))
380 `((def!method print-object ((,x ,name) ,s)
381 (funcall #',(farg po) ,x ,s))))
383 ,@(let ((pure (dd-pure defstruct)))
385 `((setf (layout-pure (classoid-layout
386 (find-classoid ',name)))
388 ((eq pure :substructure)
389 `((setf (layout-pure (classoid-layout
390 (find-classoid ',name)))
392 ,@(let ((def-con (dd-default-constructor defstruct)))
393 (when (and def-con (not (dd-alternate-metaclass defstruct)))
394 `((setf (structure-classoid-constructor (find-classoid ',name))
397 ;;; shared logic for host macroexpansion for SB!XC:DEFSTRUCT and
398 ;;; cross-compiler macroexpansion for CL:DEFSTRUCT
399 (defmacro !expander-for-defstruct (name-and-options
401 expanding-into-code-for-xc-host-p)
402 `(let ((name-and-options ,name-and-options)
403 (slot-descriptions ,slot-descriptions)
404 (expanding-into-code-for-xc-host-p
405 ,expanding-into-code-for-xc-host-p))
406 (let* ((dd (parse-defstruct-name-and-options-and-slot-descriptions
411 (let ((inherits (inherits-for-structure dd)))
413 ;; Note we intentionally enforce package locks and
414 ;; call %DEFSTRUCT first, and especially before
415 ;; %COMPILER-DEFSTRUCT. %DEFSTRUCT has the tests (and
416 ;; resulting CERROR) for collisions with LAYOUTs which
417 ;; already exist in the runtime. If there are any
418 ;; collisions, we want the user's response to CERROR
419 ;; to control what happens. Especially, if the user
420 ;; responds to the collision with ABORT, we don't want
421 ;; %COMPILER-DEFSTRUCT to modify the definition of the
423 (with-single-package-locked-error
424 (:symbol ',name "defining ~A as a structure"))
425 (%defstruct ',dd ',inherits (sb!c:source-location))
426 (eval-when (:compile-toplevel :load-toplevel :execute)
427 (%compiler-defstruct ',dd ',inherits))
428 ,@(unless expanding-into-code-for-xc-host-p
429 (append ;; FIXME: We've inherited from CMU CL nonparallel
430 ;; code for creating copiers for typed and untyped
431 ;; structures. This should be fixed.
432 ;(copier-definition dd)
433 (constructor-definitions dd)
434 (class-method-definitions dd)))
437 (with-single-package-locked-error
438 (:symbol ',name "defining ~A as a structure"))
439 (eval-when (:compile-toplevel :load-toplevel :execute)
440 (setf (info :typed-structure :info ',name) ',dd))
441 (eval-when (:load-toplevel :execute)
442 (setf (info :source-location :typed-structure ',name)
443 (sb!c:source-location)))
444 ,@(unless expanding-into-code-for-xc-host-p
445 (append (typed-accessor-definitions dd)
446 (typed-predicate-definitions dd)
447 (typed-copier-definitions dd)
448 (constructor-definitions dd)
450 `((setf (fdocumentation ',(dd-name dd) 'structure)
454 (sb!xc:defmacro defstruct (name-and-options &rest slot-descriptions)
456 "DEFSTRUCT {Name | (Name Option*)} {Slot | (Slot [Default] {Key Value}*)}
457 Define the structure type Name. Instances are created by MAKE-<name>,
458 which takes &KEY arguments allowing initial slot values to the specified.
459 A SETF'able function <name>-<slot> is defined for each slot to read and
460 write slot values. <name>-p is a type predicate.
462 Popular DEFSTRUCT options (see manual for others):
466 Specify the name for the constructor or predicate.
468 (:CONSTRUCTOR Name Lambda-List)
469 Specify the name and arguments for a BOA constructor
470 (which is more efficient when keyword syntax isn't necessary.)
472 (:INCLUDE Supertype Slot-Spec*)
473 Make this type a subtype of the structure type Supertype. The optional
474 Slot-Specs override inherited slot options.
479 Asserts that the value of this slot is always of the specified type.
482 If true, no setter function is defined for this slot."
483 (!expander-for-defstruct name-and-options slot-descriptions nil))
485 (defmacro sb!xc:defstruct (name-and-options &rest slot-descriptions)
487 "Cause information about a target structure to be built into the
489 (!expander-for-defstruct name-and-options slot-descriptions t))
491 ;;;; functions to generate code for various parts of DEFSTRUCT definitions
493 ;;; First, a helper to determine whether a name names an inherited
495 (defun accessor-inherited-data (name defstruct)
496 (assoc name (dd-inherited-accessor-alist defstruct) :test #'eq))
498 ;;; Return a list of forms which create a predicate function for a
500 (defun typed-predicate-definitions (defstruct)
501 (let ((name (dd-name defstruct))
502 (predicate-name (dd-predicate-name defstruct))
504 (when (and predicate-name (dd-named defstruct))
505 (let ((ltype (dd-lisp-type defstruct))
506 (name-index (cdr (car (last (find-name-indices defstruct))))))
507 `((defun ,predicate-name (,argname)
508 (and (typep ,argname ',ltype)
510 ((subtypep ltype 'list)
511 `(do ((head (the ,ltype ,argname) (cdr head))
513 ((or (not (consp head)) (= i ,name-index))
514 (and (consp head) (eq ',name (car head))))))
515 ((subtypep ltype 'vector)
516 `(and (= (length (the ,ltype ,argname))
517 ,(dd-length defstruct))
518 (eq ',name (aref (the ,ltype ,argname) ,name-index))))
519 (t (bug "Uncatered-for lisp type in typed DEFSTRUCT: ~S."
522 ;;; Return a list of forms to create a copier function of a typed DEFSTRUCT.
523 (defun typed-copier-definitions (defstruct)
524 (when (dd-copier-name defstruct)
525 `((setf (fdefinition ',(dd-copier-name defstruct)) #'copy-seq)
526 (declaim (ftype function ,(dd-copier-name defstruct))))))
528 ;;; Return a list of function definitions for accessing and setting
529 ;;; the slots of a typed DEFSTRUCT. The functions are proclaimed to be
530 ;;; inline, and the types of their arguments and results are declared
531 ;;; as well. We count on the compiler to do clever things with ELT.
532 (defun typed-accessor-definitions (defstruct)
534 (let ((ltype (dd-lisp-type defstruct)))
535 (dolist (slot (dd-slots defstruct))
536 (let ((name (dsd-accessor-name slot))
537 (index (dsd-index slot))
538 (slot-type `(and ,(dsd-type slot)
539 ,(dd-element-type defstruct))))
540 (let ((inherited (accessor-inherited-data name defstruct)))
543 (stuff `(declaim (inline ,name ,@(unless (dsd-read-only slot)
545 (stuff `(defun ,name (structure)
546 (declare (type ,ltype structure))
547 (the ,slot-type (elt structure ,index))))
548 (unless (dsd-read-only slot)
550 `(defun (setf ,name) (new-value structure)
551 (declare (type ,ltype structure) (type ,slot-type new-value))
552 (setf (elt structure ,index) new-value)))))
553 ((not (= (cdr inherited) index))
554 (style-warn "~@<Non-overwritten accessor ~S does not access ~
555 slot with name ~S (accessing an inherited slot ~
556 instead).~:@>" name (dsd-name slot))))))))
561 (defun require-no-print-options-so-far (defstruct)
562 (unless (and (eql (dd-print-function defstruct) 0)
563 (eql (dd-print-object defstruct) 0))
564 (error "No more than one of the following options may be specified:
565 :PRINT-FUNCTION, :PRINT-OBJECT, :TYPE")))
567 ;;; Parse a single DEFSTRUCT option and store the results in DD.
568 (defun parse-1-dd-option (option dd)
569 (let ((args (rest option))
573 (destructuring-bind (&optional conc-name) args
574 (setf (dd-conc-name dd)
575 (if (symbolp conc-name)
577 (make-symbol (string conc-name))))))
579 (destructuring-bind (&optional (cname (symbolicate "MAKE-" name))
582 (push (cons cname stuff) (dd-constructors dd))))
584 (destructuring-bind (&optional (copier (symbolicate "COPY-" name)))
586 (setf (dd-copier-name dd) copier)))
588 (destructuring-bind (&optional (predicate-name (symbolicate name "-P")))
590 (setf (dd-predicate-name dd) predicate-name)))
592 (when (dd-include dd)
593 (error "more than one :INCLUDE option"))
594 (setf (dd-include dd) args))
596 (require-no-print-options-so-far dd)
597 (setf (dd-print-function dd)
598 (the (or symbol cons) args)))
600 (require-no-print-options-so-far dd)
601 (setf (dd-print-object dd)
602 (the (or symbol cons) args)))
604 (destructuring-bind (type) args
605 (cond ((member type '(list vector))
606 (setf (dd-element-type dd) t)
607 (setf (dd-type dd) type))
608 ((and (consp type) (eq (first type) 'vector))
609 (destructuring-bind (vector vtype) type
610 (declare (ignore vector))
611 (setf (dd-element-type dd) vtype)
612 (setf (dd-type dd) 'vector)))
614 (error "~S is a bad :TYPE for DEFSTRUCT." type)))))
616 (error "The DEFSTRUCT option :NAMED takes no arguments."))
618 (destructuring-bind (offset) args
619 (setf (dd-offset dd) offset)))
621 (destructuring-bind (fun) args
622 (setf (dd-pure dd) fun)))
623 (t (error "unknown DEFSTRUCT option:~% ~S" option)))))
625 ;;; Given name and options, return a DD holding that info.
626 (defun parse-defstruct-name-and-options (name-and-options)
627 (destructuring-bind (name &rest options) name-and-options
628 (aver name) ; A null name doesn't seem to make sense here.
629 (let ((dd (make-defstruct-description name))
630 (predicate-named-p nil))
631 (dolist (option options)
632 (cond ((eq option :named)
633 (setf (dd-named dd) t))
635 (when (and (eq (car option) :predicate) (second option))
636 (setf predicate-named-p t))
637 (parse-1-dd-option option dd))
638 ((member option '(:conc-name :constructor :copier :predicate))
639 (parse-1-dd-option (list option) dd))
641 (error "unrecognized DEFSTRUCT option: ~S" option))))
646 (error ":OFFSET can't be specified unless :TYPE is specified."))
647 (unless (dd-include dd)
648 ;; FIXME: It'd be cleaner to treat no-:INCLUDE as defaulting
649 ;; to :INCLUDE STRUCTURE-OBJECT, and then let the general-case
650 ;; (INCF (DD-LENGTH DD) (DD-LENGTH included-DD)) logic take
651 ;; care of this. (Except that the :TYPE VECTOR and :TYPE
652 ;; LIST cases, with their :NAMED and un-:NAMED flavors,
653 ;; make that messy, alas.)
654 (incf (dd-length dd))))
656 ;; In case we are here, :TYPE is specified.
657 (when (and predicate-named-p (not (dd-named dd)))
658 (error ":PREDICATE cannot be used with :TYPE unless :NAMED is also specified."))
659 (require-no-print-options-so-far dd)
661 (incf (dd-length dd)))
662 (let ((offset (dd-offset dd)))
663 (when offset (incf (dd-length dd) offset)))))
665 (when (dd-include dd)
666 (frob-dd-inclusion-stuff dd))
670 ;;; Given name and options and slot descriptions (and possibly doc
671 ;;; string at the head of slot descriptions) return a DD holding that
673 (defun parse-defstruct-name-and-options-and-slot-descriptions
674 (name-and-options slot-descriptions)
675 (let ((result (parse-defstruct-name-and-options (if (atom name-and-options)
676 (list name-and-options)
678 (when (stringp (car slot-descriptions))
679 (setf (dd-doc result) (pop slot-descriptions)))
680 (dolist (slot-description slot-descriptions)
681 (allocate-1-slot result (parse-1-dsd result slot-description)))
684 ;;;; stuff to parse slot descriptions
686 ;;; Parse a slot description for DEFSTRUCT, add it to the description
687 ;;; and return it. If supplied, SLOT is a pre-initialized DSD
688 ;;; that we modify to get the new slot. This is supplied when handling
690 (defun parse-1-dsd (defstruct spec &optional
691 (slot (make-defstruct-slot-description :name ""
694 (multiple-value-bind (name default default-p type type-p read-only ro-p)
697 (when (keywordp spec)
698 (style-warn "Keyword slot name indicates probable syntax ~
699 error in DEFSTRUCT: ~S."
705 &optional (default nil default-p)
706 &key (type nil type-p) (read-only nil ro-p))
710 (uncross type) type-p
712 (t (error 'simple-program-error
713 :format-control "in DEFSTRUCT, ~S is not a legal slot ~
715 :format-arguments (list spec))))
717 (when (find name (dd-slots defstruct)
719 :key (lambda (x) (symbol-name (dsd-name x))))
720 (error 'simple-program-error
721 :format-control "duplicate slot name ~S"
722 :format-arguments (list name)))
723 (setf (dsd-name slot) name)
724 (setf (dd-slots defstruct) (nconc (dd-slots defstruct) (list slot)))
726 (let ((accessor-name (if (dd-conc-name defstruct)
727 (symbolicate (dd-conc-name defstruct) name)
729 (predicate-name (dd-predicate-name defstruct)))
730 (setf (dsd-accessor-name slot) accessor-name)
731 (when (eql accessor-name predicate-name)
732 ;; Some adventurous soul has named a slot so that its accessor
733 ;; collides with the structure type predicate. ANSI doesn't
734 ;; specify what to do in this case. As of 2001-09-04, Martin
735 ;; Atzmueller reports that CLISP and Lispworks both give
736 ;; priority to the slot accessor, so that the predicate is
737 ;; overwritten. We might as well do the same (as well as
738 ;; signalling a warning).
740 "~@<The structure accessor name ~S is the same as the name of the ~
741 structure type predicate. ANSI doesn't specify what to do in ~
742 this case. We'll overwrite the type predicate with the slot ~
743 accessor, but you can't rely on this behavior, so it'd be wise to ~
744 remove the ambiguity in your code.~@:>"
746 (setf (dd-predicate-name defstruct) nil))
747 ;; FIXME: It would be good to check for name collisions here, but
750 ;;x(when (and (fboundp accessor-name)
751 ;;x (not (accessor-inherited-data accessor-name defstruct)))
752 ;;x (style-warn "redefining ~/sb-impl::print-symbol-with-prefix/ ~
753 ;; in DEFSTRUCT" accessor-name)))
754 ;; which was done until sbcl-0.8.11.18 or so, is wrong: it causes
755 ;; a warning at MACROEXPAND time, when instead the warning should
756 ;; occur not just because the code was constructed, but because it
757 ;; is actually compiled or loaded.
761 (setf (dsd-default slot) default))
763 (setf (dsd-type slot)
764 (if (eq (dsd-type slot) t)
766 `(and ,(dsd-type slot) ,type))))
769 (setf (dsd-read-only slot) t)
770 (when (dsd-read-only slot)
771 (error "~@<The slot ~S is :READ-ONLY in superclass, and so must ~
772 be :READ-ONLY in subclass.~:@>"
776 ;;; When a value of type TYPE is stored in a structure, should it be
777 ;;; stored in a raw slot? Return the matching RAW-SLOT-DATA structure
778 ;; if TYPE should be stored in a raw slot, or NIL if not.
779 (defun structure-raw-slot-data (type)
780 (multiple-value-bind (fixnum? fixnum-certain?)
781 (sb!xc:subtypep type 'fixnum)
782 ;; (The extra test for FIXNUM-CERTAIN? here is intended for
783 ;; bootstrapping the system. In particular, in sbcl-0.6.2, we set up
784 ;; LAYOUT before FIXNUM is defined, and so could bogusly end up
785 ;; putting INDEX-typed values into raw slots if we didn't test
787 (if (or fixnum? (not fixnum-certain?))
789 (dolist (data *raw-slot-data-list*)
790 (when (sb!xc:subtypep type (raw-slot-data-raw-type data))
793 ;;; Allocate storage for a DSD in DD. This is where we decide whether
794 ;;; a slot is raw or not. Raw objects are aligned on the unit of their size.
795 (defun allocate-1-slot (dd dsd)
797 (if (eq (dd-type dd) 'structure)
798 (structure-raw-slot-data (dsd-type dsd))
802 (setf (dsd-index dsd) (dd-length dd))
803 (incf (dd-length dd)))
805 (let* ((words (raw-slot-data-n-words rsd))
806 (alignment (raw-slot-data-alignment rsd))
807 (off (rem (dd-raw-length dd) alignment)))
809 (incf (dd-raw-length dd) (- alignment off)))
810 (setf (dsd-raw-type dsd) (raw-slot-data-raw-type rsd))
811 (setf (dsd-index dsd) (dd-raw-length dd))
812 (incf (dd-raw-length dd) words)))))
815 (defun typed-structure-info-or-lose (name)
816 (or (info :typed-structure :info name)
817 (error ":TYPE'd DEFSTRUCT ~S not found for inclusion." name)))
819 ;;; Process any included slots pretty much like they were specified.
820 ;;; Also inherit various other attributes.
821 (defun frob-dd-inclusion-stuff (dd)
822 (destructuring-bind (included-name &rest modified-slots) (dd-include dd)
823 (let* ((type (dd-type dd))
826 (layout-info (compiler-layout-or-lose included-name))
827 (typed-structure-info-or-lose included-name))))
829 ;; checks on legality
830 (unless (and (eq type (dd-type included-structure))
831 (type= (specifier-type (dd-element-type included-structure))
832 (specifier-type (dd-element-type dd))))
833 (error ":TYPE option mismatch between structures ~S and ~S"
834 (dd-name dd) included-name))
835 (let ((included-classoid (find-classoid included-name nil)))
836 (when included-classoid
837 ;; It's not particularly well-defined to :INCLUDE any of the
838 ;; CMU CL INSTANCE weirdosities like CONDITION or
839 ;; GENERIC-FUNCTION, and it's certainly not ANSI-compliant.
840 (let* ((included-layout (classoid-layout included-classoid))
841 (included-dd (layout-info included-layout)))
842 (when (and (dd-alternate-metaclass included-dd)
843 ;; As of sbcl-0.pre7.73, anyway, STRUCTURE-OBJECT
844 ;; is represented with an ALTERNATE-METACLASS. But
845 ;; it's specifically OK to :INCLUDE (and PCL does)
846 ;; so in this one case, it's OK to include
847 ;; something with :ALTERNATE-METACLASS after all.
848 (not (eql included-name 'structure-object)))
849 (error "can't :INCLUDE class ~S (has alternate metaclass)"
852 (incf (dd-length dd) (dd-length included-structure))
853 (when (dd-class-p dd)
854 (let ((mc (rest (dd-alternate-metaclass included-structure))))
855 (when (and mc (not (dd-alternate-metaclass dd)))
856 (setf (dd-alternate-metaclass dd)
857 (cons included-name mc))))
858 (when (eq (dd-pure dd) :unspecified)
859 (setf (dd-pure dd) (dd-pure included-structure)))
860 (setf (dd-raw-length dd) (dd-raw-length included-structure)))
862 (setf (dd-inherited-accessor-alist dd)
863 (dd-inherited-accessor-alist included-structure))
864 (dolist (included-slot (dd-slots included-structure))
865 (let* ((included-name (dsd-name included-slot))
866 (modified (or (find included-name modified-slots
867 :key (lambda (x) (if (atom x) x (car x)))
870 ;; We stash away an alist of accessors to parents' slots
871 ;; that have already been created to avoid conflicts later
872 ;; so that structures with :INCLUDE and :CONC-NAME (and
873 ;; other edge cases) can work as specified.
874 (when (dsd-accessor-name included-slot)
875 ;; the "oldest" (i.e. highest up the tree of inheritance)
876 ;; will prevail, so don't push new ones on if they
878 (pushnew (cons (dsd-accessor-name included-slot)
879 (dsd-index included-slot))
880 (dd-inherited-accessor-alist dd)
881 :test #'eq :key #'car))
882 (let ((new-slot (parse-1-dsd dd
884 (copy-structure included-slot))))
885 (when (and (neq (dsd-type new-slot) (dsd-type included-slot))
886 (not (sb!xc:subtypep (dsd-type included-slot)
887 (dsd-type new-slot)))
888 (dsd-safe-p included-slot))
889 (setf (dsd-safe-p new-slot) nil)
893 ;;;; various helper functions for setting up DEFSTRUCTs
895 ;;; This function is called at macroexpand time to compute the INHERITS
896 ;;; vector for a structure type definition.
897 (defun inherits-for-structure (info)
898 (declare (type defstruct-description info))
899 (let* ((include (dd-include info))
900 (superclass-opt (dd-alternate-metaclass info))
903 (compiler-layout-or-lose (first include))
904 (classoid-layout (find-classoid
905 (or (first superclass-opt)
906 'structure-object))))))
909 (concatenate 'simple-vector
910 (layout-inherits super)
911 (vector super (classoid-layout (find-classoid 'stream)))))
913 (concatenate 'simple-vector
914 (layout-inherits super)
916 (classoid-layout (find-classoid 'file-stream)))))
917 ((sb!impl::string-input-stream
918 sb!impl::string-output-stream
919 sb!impl::fill-pointer-output-stream)
920 (concatenate 'simple-vector
921 (layout-inherits super)
923 (classoid-layout (find-classoid 'string-stream)))))
924 (t (concatenate 'simple-vector
925 (layout-inherits super)
928 ;;; Do miscellaneous (LOAD EVAL) time actions for the structure
929 ;;; described by DD. Create the class and LAYOUT, checking for
930 ;;; incompatible redefinition. Define those functions which are
931 ;;; sufficiently stereotyped that we can implement them as standard
933 (defun %defstruct (dd inherits source-location)
934 (declare (type defstruct-description dd))
936 ;; We set up LAYOUTs even in the cross-compilation host.
937 (multiple-value-bind (classoid layout old-layout)
938 (ensure-structure-class dd inherits "current" "new")
939 (cond ((not old-layout)
940 (unless (eq (classoid-layout classoid) layout)
941 (register-layout layout)))
943 (%redefine-defstruct classoid old-layout layout)
944 (let ((old-dd (layout-info old-layout)))
945 (when (defstruct-description-p old-dd)
946 (dolist (slot (dd-slots old-dd))
947 (fmakunbound (dsd-accessor-name slot))
948 (unless (dsd-read-only slot)
949 (fmakunbound `(setf ,(dsd-accessor-name slot)))))))
950 (setq layout (classoid-layout classoid))))
951 (setf (find-classoid (dd-name dd)) classoid)
953 (sb!c:with-source-location (source-location)
954 (setf (layout-source-location layout) source-location))
956 ;; Various other operations only make sense on the target SBCL.
958 (%target-defstruct dd layout))
962 ;;; Return a form describing the writable place used for this slot
963 ;;; in the instance named INSTANCE-NAME.
964 (defun %accessor-place-form (dd dsd instance-name)
965 (let (;; the operator that we'll use to access a typed slot
966 (ref (ecase (dd-type dd)
967 (structure '%instance-ref)
968 (list 'nth-but-with-sane-arg-order)
970 (raw-type (dsd-raw-type dsd)))
971 (if (eq raw-type t) ; if not raw slot
972 `(,ref ,instance-name ,(dsd-index dsd))
973 (let* ((raw-slot-data (find raw-type *raw-slot-data-list*
974 :key #'raw-slot-data-raw-type
976 (raw-slot-accessor (raw-slot-data-accessor-name raw-slot-data)))
977 `(,raw-slot-accessor ,instance-name ,(dsd-index dsd))))))
979 ;;; Return source transforms for the reader and writer functions of
980 ;;; the slot described by DSD. They should be inline expanded, but
981 ;;; source transforms work faster.
982 (defun slot-accessor-transforms (dd dsd)
983 (let ((accessor-place-form (%accessor-place-form dd dsd
984 `(the ,(dd-name dd) instance)))
985 (dsd-type (dsd-type dsd))
986 (value-the (if (dsd-safe-p dsd) 'truly-the 'the)))
987 (values (sb!c:source-transform-lambda (instance)
988 `(,value-the ,dsd-type ,(subst instance 'instance
989 accessor-place-form)))
990 (sb!c:source-transform-lambda (new-value instance)
991 (destructuring-bind (accessor-name &rest accessor-args)
993 (once-only ((new-value new-value)
995 `(,(info :setf :inverse accessor-name)
996 ,@(subst instance 'instance accessor-args)
997 (the ,dsd-type ,new-value))))))))
999 ;;; Return a LAMBDA form which can be used to set a slot.
1000 (defun slot-setter-lambda-form (dd dsd)
1001 ;; KLUDGE: Evaluating the results of SLOT-ACCESSOR-TRANSFORMS needs
1003 (let ((sb!c:*lexenv* (if (boundp 'sb!c:*lexenv*)
1005 (sb!c::make-null-lexenv))))
1006 `(lambda (new-value instance)
1007 ,(funcall (nth-value 1 (slot-accessor-transforms dd dsd))
1008 '(dummy new-value instance)))))
1010 ;;; Blow away all the compiler info for the structure CLASS. Iterate
1011 ;;; over this type, clearing the compiler structure type info, and
1012 ;;; undefining all the associated functions. If SUBCLASSES-P, also do
1013 ;;; the same for subclasses. FIXME: maybe rename UNDEFINE-FUN-NAME to
1014 ;;; UNDECLARE-FUNCTION-NAME?
1015 (defun undeclare-structure (classoid subclasses-p)
1016 (let ((info (layout-info (classoid-layout classoid))))
1017 (when (defstruct-description-p info)
1018 (let ((type (dd-name info)))
1019 (remhash type *typecheckfuns*)
1020 (setf (info :type :compiler-layout type) nil)
1021 (undefine-fun-name (dd-copier-name info))
1022 (undefine-fun-name (dd-predicate-name info))
1023 (dolist (slot (dd-slots info))
1024 (let ((fun (dsd-accessor-name slot)))
1025 (unless (accessor-inherited-data fun info)
1026 (undefine-fun-name fun)
1027 (unless (dsd-read-only slot)
1028 (undefine-fun-name `(setf ,fun)))))))
1029 ;; Clear out the SPECIFIER-TYPE cache so that subsequent
1030 ;; references are unknown types.
1031 (values-specifier-type-cache-clear)))
1033 (let ((subclasses (classoid-subclasses classoid)))
1036 (dohash ((classoid layout)
1039 (declare (ignore layout))
1040 (undeclare-structure classoid nil)
1041 (subs (classoid-proper-name classoid)))
1042 ;; Is it really necessary to warn about
1043 ;; undeclaring functions for subclasses?
1045 (warn "undeclaring functions for old subclasses ~
1047 (classoid-name classoid)
1050 ;;; core compile-time setup of any class with a LAYOUT, used even by
1051 ;;; !DEFSTRUCT-WITH-ALTERNATE-METACLASS weirdosities
1052 (defun %compiler-set-up-layout (dd
1054 ;; Several special cases
1055 ;; (STRUCTURE-OBJECT itself, and
1056 ;; structures with alternate
1057 ;; metaclasses) call this function
1058 ;; directly, and they're all at the
1059 ;; base of the instance class
1060 ;; structure, so this is a handy
1061 ;; default. (But note
1062 ;; FUNCALLABLE-STRUCTUREs need
1064 (inherits (vector (find-layout t))))
1066 (multiple-value-bind (classoid layout old-layout)
1067 (multiple-value-bind (clayout clayout-p)
1068 (info :type :compiler-layout (dd-name dd))
1069 (ensure-structure-class dd
1072 "The most recently compiled"
1074 "the most recently loaded"
1075 :compiler-layout clayout))
1077 (undeclare-structure (layout-classoid old-layout)
1078 (and (classoid-subclasses classoid)
1079 (not (eq layout old-layout))))
1080 (setf (layout-invalid layout) nil)
1081 ;; FIXME: it might be polite to hold onto old-layout and
1082 ;; restore it at the end of the file. -- RMK 2008-09-19
1083 ;; (International Talk Like a Pirate Day).
1084 (warn "~@<Clobbering the compiler's idea of the layout of ~A.~:@>"
1087 (unless (eq (classoid-layout classoid) layout)
1088 (register-layout layout :invalidate nil))
1089 (setf (find-classoid (dd-name dd)) classoid)))
1091 ;; At this point the class should be set up in the INFO database.
1092 ;; But the logic that enforces this is a little tangled and
1093 ;; scattered, so it's not obvious, so let's check.
1094 (aver (find-classoid (dd-name dd) nil))
1096 (setf (info :type :compiler-layout (dd-name dd)) layout))
1100 ;;; Do (COMPILE LOAD EVAL)-time actions for the normal (not
1101 ;;; ALTERNATE-LAYOUT) DEFSTRUCT described by DD.
1102 (defun %compiler-defstruct (dd inherits)
1103 (declare (type defstruct-description dd))
1105 (%compiler-set-up-layout dd inherits)
1107 (let* ((dtype (dd-declarable-type dd)))
1109 (let ((copier-name (dd-copier-name dd)))
1111 (sb!xc:proclaim `(ftype (sfunction (,dtype) ,dtype) ,copier-name))))
1113 (let ((predicate-name (dd-predicate-name dd)))
1114 (when predicate-name
1115 (sb!xc:proclaim `(ftype (sfunction (t) boolean) ,predicate-name))
1116 ;; Provide inline expansion (or not).
1118 ((structure funcallable-structure)
1119 ;; Let the predicate be inlined.
1120 (setf (info :function :inline-expansion-designator predicate-name)
1123 ;; This dead simple definition works because the
1124 ;; type system knows how to generate inline type
1125 ;; tests for instances.
1126 (typep x ',(dd-name dd))))
1127 (info :function :inlinep predicate-name)
1130 ;; Just punt. We could provide inline expansions for :TYPE
1131 ;; LIST and :TYPE VECTOR predicates too, but it'd be a
1132 ;; little messier and we don't bother. (Does anyway use
1133 ;; typed DEFSTRUCTs at all, let alone for high
1137 (dolist (dsd (dd-slots dd))
1138 (let* ((accessor-name (dsd-accessor-name dsd))
1139 (dsd-type (dsd-type dsd)))
1141 (let ((inherited (accessor-inherited-data accessor-name dd)))
1144 (setf (info :function :structure-accessor accessor-name) dd)
1145 (multiple-value-bind (reader-designator writer-designator)
1146 (slot-accessor-transforms dd dsd)
1147 (sb!xc:proclaim `(ftype (sfunction (,dtype) ,dsd-type)
1149 (setf (info :function :source-transform accessor-name)
1151 (unless (dsd-read-only dsd)
1152 (let ((setf-accessor-name `(setf ,accessor-name)))
1154 `(ftype (sfunction (,dsd-type ,dtype) ,dsd-type)
1155 ,setf-accessor-name))
1156 (setf (info :function :source-transform setf-accessor-name)
1157 writer-designator)))))
1158 ((not (= (cdr inherited) (dsd-index dsd)))
1159 (style-warn "~@<Non-overwritten accessor ~S does not access ~
1160 slot with name ~S (accessing an inherited slot ~
1163 (dsd-name dsd)))))))))
1166 ;;;; redefinition stuff
1168 ;;; Compare the slots of OLD and NEW, returning 3 lists of slot names:
1169 ;;; 1. Slots which have moved,
1170 ;;; 2. Slots whose type has changed,
1171 ;;; 3. Deleted slots.
1172 (defun compare-slots (old new)
1173 (let* ((oslots (dd-slots old))
1174 (nslots (dd-slots new))
1175 (onames (mapcar #'dsd-name oslots))
1176 (nnames (mapcar #'dsd-name nslots)))
1179 (dolist (name (intersection onames nnames))
1180 (let ((os (find name oslots :key #'dsd-name :test #'string=))
1181 (ns (find name nslots :key #'dsd-name :test #'string=)))
1182 (unless (sb!xc:subtypep (dsd-type ns) (dsd-type os))
1184 (unless (and (= (dsd-index os) (dsd-index ns))
1185 (eq (dsd-raw-type os) (dsd-raw-type ns)))
1189 (set-difference onames nnames :test #'string=)))))
1191 ;;; If we are redefining a structure with different slots than in the
1192 ;;; currently loaded version, give a warning and return true.
1193 (defun redefine-structure-warning (classoid old new)
1194 (declare (type defstruct-description old new)
1195 (type classoid classoid)
1197 (let ((name (dd-name new)))
1198 (multiple-value-bind (moved retyped deleted) (compare-slots old new)
1199 (when (or moved retyped deleted)
1201 "incompatibly redefining slots of structure class ~S~@
1202 Make sure any uses of affected accessors are recompiled:~@
1203 ~@[ These slots were moved to new positions:~% ~S~%~]~
1204 ~@[ These slots have new incompatible types:~% ~S~%~]~
1205 ~@[ These slots were deleted:~% ~S~%~]"
1206 name moved retyped deleted)
1209 ;;; This function is called when we are incompatibly redefining a
1210 ;;; structure CLASS to have the specified NEW-LAYOUT. We signal an
1211 ;;; error with some proceed options and return the layout that should
1213 (defun %redefine-defstruct (classoid old-layout new-layout)
1214 (declare (type classoid classoid)
1215 (type layout old-layout new-layout))
1216 (let ((name (classoid-proper-name classoid)))
1218 (error "~@<attempt to redefine the ~S class ~S incompatibly with the current definition~:@>"
1224 "~@<Use the new definition of ~S, invalidating ~
1225 already-loaded code and instances.~@:>"
1227 (register-layout new-layout))
1228 (recklessly-continue ()
1231 "~@<Use the new definition of ~S as if it were ~
1232 compatible, allowing old accessors to use new ~
1233 instances and allowing new accessors to use old ~
1236 ;; classic CMU CL warning: "Any old ~S instances will be in a bad way.
1237 ;; I hope you know what you're doing..."
1238 (register-layout new-layout
1240 :destruct-layout old-layout))
1242 ;; FIXME: deprecated 2002-10-16, and since it's only interactive
1243 ;; hackery instead of a supported feature, can probably be deleted
1245 :report "(deprecated synonym for RECKLESSLY-CONTINUE)"
1246 (register-layout new-layout
1248 :destruct-layout old-layout))))
1251 (declaim (inline dd-layout-length))
1252 (defun dd-layout-length (dd)
1253 (+ (dd-length dd) (dd-raw-length dd)))
1255 (declaim (ftype (sfunction (defstruct-description) index) dd-instance-length))
1256 (defun dd-instance-length (dd)
1257 ;; Make sure the object ends at a two-word boundary. Note that this does
1258 ;; not affect the amount of memory used, since the allocator would add the
1259 ;; same padding anyway. However, raw slots are indexed from the length of
1260 ;; the object as indicated in the header, so the pad word needs to be
1261 ;; included in that length to guarantee proper alignment of raw double float
1262 ;; slots, necessary for (at least) the SPARC backend.
1263 (let ((layout-length (dd-layout-length dd)))
1264 (declare (type index layout-length))
1265 (+ layout-length (mod (1+ layout-length) 2))))
1267 ;;; This is called when we are about to define a structure class. It
1268 ;;; returns a (possibly new) class object and the layout which should
1269 ;;; be used for the new definition (may be the current layout, and
1270 ;;; also might be an uninstalled forward referenced layout.) The third
1271 ;;; value is true if this is an incompatible redefinition, in which
1272 ;;; case it is the old layout.
1273 (defun ensure-structure-class (info inherits old-context new-context
1274 &key compiler-layout)
1275 (multiple-value-bind (class old-layout)
1279 (class 'structure-classoid)
1280 (constructor 'make-structure-classoid))
1281 (dd-alternate-metaclass info)
1282 (declare (ignore name))
1283 (insured-find-classoid (dd-name info)
1284 (if (eq class 'structure-classoid)
1286 (sb!xc:typep x 'structure-classoid))
1288 (sb!xc:typep x (classoid-name (find-classoid class)))))
1289 (fdefinition constructor)))
1290 (setf (classoid-direct-superclasses class)
1291 (case (dd-name info)
1294 sb!impl::string-input-stream sb!impl::string-output-stream
1295 sb!impl::fill-pointer-output-stream)
1296 (list (layout-classoid (svref inherits (1- (length inherits))))
1297 (layout-classoid (svref inherits (- (length inherits) 2)))))
1299 (list (layout-classoid
1300 (svref inherits (1- (length inherits))))))))
1301 (let ((new-layout (make-layout :classoid class
1303 :depthoid (length inherits)
1304 :length (dd-layout-length info)
1305 :n-untagged-slots (dd-raw-length info)
1307 (old-layout (or compiler-layout old-layout)))
1310 (values class new-layout nil))
1311 (;; This clause corresponds to an assertion in REDEFINE-LAYOUT-WARNING
1312 ;; of classic CMU CL. I moved it out to here because it was only
1313 ;; exercised in this code path anyway. -- WHN 19990510
1314 (not (eq (layout-classoid new-layout) (layout-classoid old-layout)))
1315 (error "shouldn't happen: weird state of OLD-LAYOUT?"))
1316 ((not *type-system-initialized*)
1317 (setf (layout-info old-layout) info)
1318 (values class old-layout nil))
1319 ((redefine-layout-warning old-context
1322 (layout-length new-layout)
1323 (layout-inherits new-layout)
1324 (layout-depthoid new-layout)
1325 (layout-n-untagged-slots new-layout))
1326 (values class new-layout old-layout))
1328 (let ((old-info (layout-info old-layout)))
1330 ((or defstruct-description)
1331 (cond ((redefine-structure-warning class old-info info)
1332 (values class new-layout old-layout))
1334 (setf (layout-info old-layout) info)
1335 (values class old-layout nil))))
1337 (setf (layout-info old-layout) info)
1338 (values class old-layout nil))
1340 (error "shouldn't happen! strange thing in LAYOUT-INFO:~% ~S"
1342 (values class new-layout old-layout)))))))))
1344 ;;; Return a list of pairs (name . index). Used for :TYPE'd
1345 ;;; constructors to find all the names that we have to splice in &
1346 ;;; where. Note that these types don't have a layout, so we can't look
1347 ;;; at LAYOUT-INHERITS.
1348 (defun find-name-indices (defstruct)
1351 (do ((info defstruct
1352 (typed-structure-info-or-lose (first (dd-include info)))))
1353 ((not (dd-include info))
1358 (dolist (info infos)
1359 (incf i (or (dd-offset info) 0))
1360 (when (dd-named info)
1361 (res (cons (dd-name info) i)))
1362 (setq i (dd-length info)))))
1366 ;;; These functions are called to actually make a constructor after we
1367 ;;; have processed the arglist. The correct variant (according to the
1368 ;;; DD-TYPE) should be called. The function is defined with the
1369 ;;; specified name and arglist. VARS and TYPES are used for argument
1370 ;;; type declarations. VALUES are the values for the slots (in order.)
1372 ;;; This is split three ways because:
1373 ;;; * LIST & VECTOR structures need "name" symbols stuck in at
1374 ;;; various weird places, whereas STRUCTURE structures have
1376 ;;; * We really want to use LIST to make list structures, instead of
1377 ;;; MAKE-LIST/(SETF ELT). (We can't in general use VECTOR in an
1378 ;;; analogous way, since VECTOR makes a SIMPLE-VECTOR and vector-typed
1379 ;;; structures can have arbitrary subtypes of VECTOR, not necessarily
1381 ;;; * STRUCTURE structures can have raw slots that must also be
1382 ;;; allocated and indirectly referenced.
1383 (defun create-vector-constructor (dd cons-name arglist ftype-arglist decls values)
1384 (let ((temp (gensym))
1385 (etype (dd-element-type dd))
1386 (len (dd-length dd)))
1388 `(defun ,cons-name ,arglist
1389 ,@(when decls `((declare ,@decls)))
1390 (let ((,temp (make-array ,len :element-type ',etype)))
1391 ,@(mapcar (lambda (x)
1392 `(setf (aref ,temp ,(cdr x)) ',(car x)))
1393 (find-name-indices dd))
1394 ,@(mapcar (lambda (dsd value)
1395 (unless (eq value '.do-not-initialize-slot.)
1396 `(setf (aref ,temp ,(dsd-index dsd)) ,value)))
1397 (dd-slots dd) values)
1399 `(sfunction ,ftype-arglist (simple-array ,etype (,len))))))
1400 (defun create-list-constructor (dd cons-name arglist ftype-arglist decls values)
1401 (let ((vals (make-list (dd-length dd) :initial-element nil)))
1402 (dolist (x (find-name-indices dd))
1403 (setf (elt vals (cdr x)) `',(car x)))
1404 (loop for dsd in (dd-slots dd) and val in values do
1405 (setf (elt vals (dsd-index dsd))
1406 (if (eq val '.do-not-initialize-slot.) 0 val)))
1408 `(defun ,cons-name ,arglist
1409 ,@(when decls `((declare ,@decls)))
1411 `(sfunction ,ftype-arglist list))))
1412 (defun create-structure-constructor (dd cons-name arglist ftype-arglist decls values)
1414 ;; The difference between the two implementations here is that on all
1415 ;; platforms we don't have the appropriate RAW-INSTANCE-INIT VOPS, which
1416 ;; must be able to deal with immediate values as well -- unlike
1417 ;; RAW-INSTANCE-SET VOPs, which never end up seeing immediate values. With
1418 ;; some additional cleverness we might manage without them and just a single
1419 ;; implementation here, though -- figure out a way to ensure that on those
1420 ;; platforms we always still get a non-immediate TN in every case...
1422 ;; Until someone does that, this means that instances with raw slots can be
1423 ;; DX allocated only on platforms with those additional VOPs.
1424 #!+raw-instance-init-vops
1425 (let* ((slot-values nil)
1427 (mapcan (lambda (dsd value)
1428 (unless (eq value '.do-not-initialize-slot.)
1429 (push value slot-values)
1430 (list (list* :slot (dsd-raw-type dsd) (dsd-index dsd)))))
1433 `(defun ,cons-name ,arglist
1434 ,@(when decls `((declare ,@decls)))
1435 (%make-structure-instance-macro ,dd ',slot-specs ,@(reverse slot-values))))
1436 #!-raw-instance-init-vops
1437 (let ((instance (gensym "INSTANCE")) slot-values slot-specs raw-slots raw-values)
1438 (mapc (lambda (dsd value)
1439 (unless (eq value '.do-not-initialize-slot.)
1440 (let ((raw-type (dsd-raw-type dsd)))
1441 (cond ((eq t raw-type)
1442 (push value slot-values)
1443 (push (list* :slot raw-type (dsd-index dsd)) slot-specs))
1445 (push value raw-values)
1446 (push dsd raw-slots))))))
1449 `(defun ,cons-name ,arglist
1450 ,@(when decls`((declare ,@decls)))
1452 `(let ((,instance (%make-structure-instance-macro ,dd ',slot-specs ,@slot-values)))
1453 ,@(mapcar (lambda (dsd value)
1454 ;; (Note that we can't in general use the
1455 ;; ordinary named slot setter function here
1456 ;; because the slot might be :READ-ONLY, so we
1457 ;; whip up new LAMBDA representations of slot
1458 ;; setters for the occasion.)
1459 `(,(slot-setter-lambda-form dd dsd) ,value ,instance))
1463 `(%make-structure-instance-macro ,dd ',slot-specs ,@slot-values))))
1464 `(sfunction ,ftype-arglist ,(dd-name dd))))
1466 ;;; Create a default (non-BOA) keyword constructor.
1467 (defun create-keyword-constructor (defstruct creator)
1468 (declare (type function creator))
1469 (collect ((arglist (list '&key))
1473 (let ((int-type (if (eq 'vector (dd-type defstruct))
1474 (dd-element-type defstruct)
1476 (dolist (slot (dd-slots defstruct))
1477 (let* ((dum (sb!xc:gensym "DUM"))
1478 (name (dsd-name slot))
1479 (keyword (keywordicate name))
1480 ;; Canonicalize the type for a prettier macro-expansion
1481 (type (type-specifier
1482 (specifier-type `(and ,int-type ,(dsd-type slot))))))
1483 (arglist `((,keyword ,dum) ,(dsd-default slot)))
1485 ;; KLUDGE: we need a separate type declaration for for
1486 ;; keyword arguments, since default values bypass the
1487 ;; checking provided by the FTYPE.
1489 (decls `(type ,type ,dum)))
1490 (ftype-args `(,keyword ,type)))))
1492 defstruct (dd-default-constructor defstruct)
1493 (arglist) `(&key ,@(ftype-args)) (decls) (vals))))
1495 ;;; Given a structure and a BOA constructor spec, call CREATOR with
1496 ;;; the appropriate args to make a constructor.
1497 (defun create-boa-constructor (defstruct boa creator)
1498 (declare (type function creator))
1499 (multiple-value-bind (req opt restp rest keyp keys allowp auxp aux)
1500 (parse-lambda-list (second boa))
1506 (let ((int-type (if (eq 'vector (dd-type defstruct))
1507 (dd-element-type defstruct)
1509 (labels ((get-slot (name)
1510 (let* ((res (find name (dd-slots defstruct)
1513 (type (type-specifier
1515 `(and ,int-type ,(if res
1518 (values type (when res (dsd-default res)))))
1519 (do-default (arg &optional keyp)
1520 (multiple-value-bind (type default) (get-slot arg)
1521 (arglist `(,arg ,default))
1524 (arg-type type (keywordicate arg) arg)
1526 (arg-type (type &optional key var)
1528 ;; KLUDGE: see comment in CREATE-KEYWORD-CONSTRUCTOR.
1530 (decls `(type ,type ,var)))
1531 (ftype-args `(,key ,type)))
1533 (ftype-args type)))))
1537 (arg-type (get-slot arg)))
1540 (arglist '&optional)
1541 (ftype-args '&optional)
1545 ;; FIXME: this shares some logic (though not
1546 ;; code) with the &key case below (and it
1547 ;; looks confusing) -- factor out the logic
1548 ;; if possible. - CSR, 2002-04-19
1551 (def (nth-value 1 (get-slot name)))
1552 (supplied-test nil supplied-test-p))
1554 (arglist `(,name ,def ,@(if supplied-test-p `(,supplied-test) nil)))
1556 (arg-type (get-slot name))
1557 (when supplied-test-p
1558 (vars supplied-test))))
1560 (do-default arg)))))
1563 (arglist '&rest rest)
1567 (decls `(type list ,rest)))
1574 (destructuring-bind (wot
1577 (supplied-test nil supplied-test-p))
1579 (multiple-value-bind (key name)
1581 (destructuring-bind (key var) wot
1583 (values (keywordicate wot) wot))
1584 (multiple-value-bind (type slot-def)
1586 (arglist `(,wot ,(if def-p def slot-def)
1587 ,@(if supplied-test-p `(,supplied-test) nil)))
1589 (arg-type type key name)
1590 (when supplied-test-p
1591 (vars supplied-test)))))
1592 (do-default key t))))
1595 (arglist '&allow-other-keys)
1596 (ftype-args '&allow-other-keys))
1601 (if (proper-list-of-length-p arg 2)
1602 (let ((var (first arg)))
1605 (decls `(type ,(get-slot var) ,var)))
1606 (skipped-vars (if (consp arg) (first arg) arg)))))))
1608 (funcall creator defstruct (first boa)
1609 (arglist) (ftype-args) (decls)
1610 (loop for slot in (dd-slots defstruct)
1611 for name = (dsd-name slot)
1612 collect (cond ((find name (skipped-vars) :test #'string=)
1613 ;; CLHS 3.4.6 Boa Lambda Lists
1614 (setf (dsd-safe-p slot) nil)
1615 '.do-not-initialize-slot.)
1616 ((or (find (dsd-name slot) (vars) :test #'string=)
1617 (let ((type (dsd-type slot)))
1620 `(the ,type ,(dsd-default slot))))))))))))
1622 ;;; Grovel the constructor options, and decide what constructors (if
1624 (defun constructor-definitions (defstruct)
1625 (let ((no-constructors nil)
1628 (creator (ecase (dd-type defstruct)
1629 (structure #'create-structure-constructor)
1630 (vector #'create-vector-constructor)
1631 (list #'create-list-constructor))))
1632 (dolist (constructor (dd-constructors defstruct))
1633 (destructuring-bind (name &optional (boa-ll nil boa-p)) constructor
1634 (declare (ignore boa-ll))
1635 (cond ((not name) (setq no-constructors t))
1636 (boa-p (push constructor boas))
1637 (t (push name defaults)))))
1639 (when no-constructors
1640 (when (or defaults boas)
1641 (error "(:CONSTRUCTOR NIL) combined with other :CONSTRUCTORs"))
1642 (return-from constructor-definitions ()))
1644 (unless (or defaults boas)
1645 (push (symbolicate "MAKE-" (dd-name defstruct)) defaults))
1649 (let ((cname (first defaults)))
1650 (setf (dd-default-constructor defstruct) cname)
1651 (multiple-value-bind (cons ftype)
1652 (create-keyword-constructor defstruct creator)
1653 (res `(declaim (ftype ,ftype ,@defaults)))
1655 (dolist (other-name (rest defaults))
1656 (res `(setf (fdefinition ',other-name) (fdefinition ',cname))))))
1659 (multiple-value-bind (cons ftype)
1660 (create-boa-constructor defstruct boa creator)
1661 (res `(declaim (ftype ,ftype ,(first boa))))
1666 ;;;; instances with ALTERNATE-METACLASS
1668 ;;;; The CMU CL support for structures with ALTERNATE-METACLASS was a
1669 ;;;; fairly general extension embedded in the main DEFSTRUCT code, and
1670 ;;;; the result was an fairly impressive mess as ALTERNATE-METACLASS
1671 ;;;; extension mixed with ANSI CL generality (e.g. :TYPE and :INCLUDE)
1672 ;;;; and CMU CL implementation hairiness (esp. raw slots). This SBCL
1673 ;;;; version is much less ambitious, noticing that ALTERNATE-METACLASS
1674 ;;;; is only used to implement CONDITION, STANDARD-INSTANCE, and
1675 ;;;; GENERIC-FUNCTION, and defining a simple specialized
1676 ;;;; separate-from-DEFSTRUCT macro to provide only enough
1677 ;;;; functionality to support those.
1679 ;;;; KLUDGE: The defining macro here is so specialized that it's ugly
1680 ;;;; in its own way. It also violates once-and-only-once by knowing
1681 ;;;; much about structures and layouts that is already known by the
1682 ;;;; main DEFSTRUCT macro. Hopefully it will go away presently
1683 ;;;; (perhaps when CL:CLASS and SB-PCL:CLASS meet) as per FIXME below.
1684 ;;;; -- WHN 2001-10-28
1686 ;;;; FIXME: There seems to be no good reason to shoehorn CONDITION,
1687 ;;;; STANDARD-INSTANCE, and GENERIC-FUNCTION into mutated structures
1688 ;;;; instead of just implementing them as primitive objects. (This
1689 ;;;; reduced-functionality macro seems pretty close to the
1690 ;;;; functionality of DEFINE-PRIMITIVE-OBJECT..)
1692 (defun make-dd-with-alternate-metaclass (&key (class-name (missing-arg))
1693 (superclass-name (missing-arg))
1694 (metaclass-name (missing-arg))
1695 (dd-type (missing-arg))
1696 metaclass-constructor
1698 (let* ((dd (make-defstruct-description class-name))
1699 (conc-name (concatenate 'string (symbol-name class-name) "-"))
1700 (dd-slots (let ((reversed-result nil)
1701 ;; The index starts at 1 for ordinary named
1702 ;; slots because slot 0 is magical, used for
1703 ;; the LAYOUT in CONDITIONs and
1704 ;; FUNCALLABLE-INSTANCEs. (This is the same
1705 ;; in ordinary structures too: see (INCF
1707 ;; PARSE-DEFSTRUCT-NAME-AND-OPTIONS).
1709 (dolist (slot-name slot-names)
1710 (push (make-defstruct-slot-description
1713 :accessor-name (symbolicate conc-name slot-name))
1716 (nreverse reversed-result))))
1718 ;; We don't support inheritance of alternate metaclass stuff,
1719 ;; and it's not a general-purpose facility, so sanity check our
1722 (aver (eq superclass-name 't)))
1723 (funcallable-structure
1724 (aver (eq superclass-name 'function)))
1725 (t (bug "Unknown DD-TYPE in ALTERNATE-METACLASS: ~S" dd-type)))
1726 (setf (dd-alternate-metaclass dd) (list superclass-name
1728 metaclass-constructor)
1729 (dd-slots dd) dd-slots
1730 (dd-length dd) (1+ (length slot-names))
1731 (dd-type dd) dd-type)
1734 ;;; make !DEFSTRUCT-WITH-ALTERNATE-METACLASS compilable by the host
1735 ;;; lisp, installing the information we need to reason about the
1736 ;;; structures (layouts and classoids).
1738 ;;; FIXME: we should share the parsing and the DD construction between
1739 ;;; this and the cross-compiler version, but my brain was too small to
1740 ;;; get that right. -- CSR, 2006-09-14
1742 (defmacro !defstruct-with-alternate-metaclass
1744 (slot-names (missing-arg))
1745 (boa-constructor (missing-arg))
1746 (superclass-name (missing-arg))
1747 (metaclass-name (missing-arg))
1748 (metaclass-constructor (missing-arg))
1749 (dd-type (missing-arg))
1751 (runtime-type-checks-p t))
1753 (declare (type (and list (not null)) slot-names))
1754 (declare (type (and symbol (not null))
1758 metaclass-constructor))
1759 (declare (type symbol predicate))
1760 (declare (type (member structure funcallable-structure) dd-type))
1761 (declare (ignore boa-constructor predicate runtime-type-checks-p))
1763 (let* ((dd (make-dd-with-alternate-metaclass
1764 :class-name class-name
1765 :slot-names slot-names
1766 :superclass-name superclass-name
1767 :metaclass-name metaclass-name
1768 :metaclass-constructor metaclass-constructor
1772 (eval-when (:compile-toplevel :load-toplevel :execute)
1773 (%compiler-set-up-layout ',dd ',(inherits-for-structure dd))))))
1775 (sb!xc:proclaim '(special *defstruct-hooks*))
1777 (sb!xc:defmacro !defstruct-with-alternate-metaclass
1779 (slot-names (missing-arg))
1780 (boa-constructor (missing-arg))
1781 (superclass-name (missing-arg))
1782 (metaclass-name (missing-arg))
1783 (metaclass-constructor (missing-arg))
1784 (dd-type (missing-arg))
1786 (runtime-type-checks-p t))
1788 (declare (type (and list (not null)) slot-names))
1789 (declare (type (and symbol (not null))
1793 metaclass-constructor))
1794 (declare (type symbol predicate))
1795 (declare (type (member structure funcallable-structure) dd-type))
1797 (let* ((dd (make-dd-with-alternate-metaclass
1798 :class-name class-name
1799 :slot-names slot-names
1800 :superclass-name superclass-name
1801 :metaclass-name metaclass-name
1802 :metaclass-constructor metaclass-constructor
1804 (dd-slots (dd-slots dd))
1805 (dd-length (1+ (length slot-names)))
1806 (object-gensym (sb!xc:gensym "OBJECT"))
1807 (new-value-gensym (sb!xc:gensym "NEW-VALUE-"))
1808 (delayed-layout-form `(%delayed-get-compiler-layout ,class-name)))
1809 (multiple-value-bind (raw-maker-form raw-reffer-operator)
1812 (values `(%make-structure-instance-macro ,dd nil)
1814 (funcallable-structure
1815 (values `(let ((,object-gensym
1816 (%make-funcallable-instance ,dd-length)))
1817 (setf (%funcallable-instance-layout ,object-gensym)
1818 ,delayed-layout-form)
1820 '%funcallable-instance-info)))
1823 (eval-when (:compile-toplevel :load-toplevel :execute)
1824 (%compiler-set-up-layout ',dd ',(inherits-for-structure dd)))
1826 ;; slot readers and writers
1827 (declaim (inline ,@(mapcar #'dsd-accessor-name dd-slots)))
1828 ,@(mapcar (lambda (dsd)
1829 `(defun ,(dsd-accessor-name dsd) (,object-gensym)
1830 ,@(when runtime-type-checks-p
1831 `((declare (type ,class-name ,object-gensym))))
1832 (,raw-reffer-operator ,object-gensym
1835 (declaim (inline ,@(mapcar (lambda (dsd)
1836 `(setf ,(dsd-accessor-name dsd)))
1838 ,@(mapcar (lambda (dsd)
1839 `(defun (setf ,(dsd-accessor-name dsd)) (,new-value-gensym
1841 ,@(when runtime-type-checks-p
1842 `((declare (type ,class-name ,object-gensym))))
1843 (setf (,raw-reffer-operator ,object-gensym
1845 ,new-value-gensym)))
1849 (defun ,boa-constructor ,slot-names
1850 (let ((,object-gensym ,raw-maker-form))
1851 ,@(mapcar (lambda (slot-name)
1852 (let ((dsd (find (symbol-name slot-name) dd-slots
1854 (symbol-name (dsd-name x)))
1856 ;; KLUDGE: bug 117 bogowarning. Neither
1857 ;; DECLAREing the type nor TRULY-THE cut
1858 ;; the mustard -- it still gives warnings.
1859 (enforce-type dsd defstruct-slot-description)
1860 `(setf (,(dsd-accessor-name dsd) ,object-gensym)
1867 ;; Just delegate to the compiler's type optimization
1868 ;; code, which knows how to generate inline type tests
1869 ;; for the whole CMU CL INSTANCE menagerie.
1870 `(defun ,predicate (,object-gensym)
1871 (typep ,object-gensym ',class-name)))
1873 (when (boundp '*defstruct-hooks*)
1874 (dolist (fun *defstruct-hooks*)
1875 (funcall fun (find-classoid ',(dd-name dd)))))))))
1877 ;;;; finalizing bootstrapping
1879 ;;; Set up DD and LAYOUT for STRUCTURE-OBJECT class itself.
1881 ;;; Ordinary structure classes effectively :INCLUDE STRUCTURE-OBJECT
1882 ;;; when they have no explicit :INCLUDEs, so (1) it needs to be set up
1883 ;;; before we can define ordinary structure classes, and (2) it's
1884 ;;; special enough (and simple enough) that we just build it by hand
1885 ;;; instead of trying to generalize the ordinary DEFSTRUCT code.
1886 (defun !set-up-structure-object-class ()
1887 (let ((dd (make-defstruct-description 'structure-object)))
1889 ;; Note: This has an ALTERNATE-METACLASS only because of blind
1890 ;; clueless imitation of the CMU CL code -- dunno if or why it's
1892 (dd-alternate-metaclass dd) '(t)
1895 (dd-type dd) 'structure)
1896 (%compiler-set-up-layout dd)))
1897 (!set-up-structure-object-class)
1899 ;;; early structure predeclarations: Set up DD and LAYOUT for ordinary
1900 ;;; (non-ALTERNATE-METACLASS) structures which are needed early.
1902 '#.(sb-cold:read-from-file
1903 "src/code/early-defstruct-args.lisp-expr"))
1904 (let* ((dd (parse-defstruct-name-and-options-and-slot-descriptions
1907 (inherits (inherits-for-structure dd)))
1908 (%compiler-defstruct dd inherits)))
1910 ;;; finding these beasts
1911 (defun find-defstruct-description (name &optional (errorp t))
1912 (let ((info (layout-info (classoid-layout (find-classoid name errorp)))))
1913 (if (defstruct-description-p info)
1916 (error "No DEFSTRUCT-DESCRIPTION for ~S." name)))))
1918 (/show0 "code/defstruct.lisp end of file")