src/code/target-defstruct.lisp

   1 ;;;; This software is part of the SBCL system. See the README file for
   2 ;;;; more information.
   3 ;;;;
   4 ;;;; This software is derived from the CMU CL system, which was
   5 ;;;; written at Carnegie Mellon University and released into the
   6 ;;;; public domain. The software is in the public domain and is
   7 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
   8 ;;;; files for more information.
   9
  10 (in-package "SB!KERNEL")
  11
  12 (/show0 "target-defstruct.lisp 12")
  13 \f
  14 ;;;; structure frobbing primitives
  15
  16 ;;; Allocate a new instance with LENGTH data slots.
  17 (defun %make-instance (length)
  18   (declare (type index length))
  19   (%make-instance length))
  20
  21 ;;; Given an instance, return its length.
  22 (defun %instance-length (instance)
  23   (declare (type instance instance))
  24   (%instance-length instance))
  25
  26 ;;; Return the value from the INDEXth slot of INSTANCE. This is SETFable.
  27 (defun %instance-ref (instance index)
  28   (%instance-ref instance index))
  29
  30 ;;; Set the INDEXth slot of INSTANCE to NEW-VALUE.
  31 (defun %instance-set (instance index new-value)
  32   (setf (%instance-ref instance index) new-value))
  33
  34 (defun %instance-compare-and-swap (instance index old new)
  35   #!+(or x86 x86-64)
  36   (%instance-compare-and-swap instance index old new)
  37   #!-(or x86 x86-64)
  38   (let ((n-old (%instance-ref instance index)))
  39     (when (eq old n-old)
  40       (%instance-set instance index new))
  41     n-old))
  42
  43 #!-hppa
  44 (progn
  45   (defun %raw-instance-ref/word (instance index)
  46     (declare (type index index))
  47     (%raw-instance-ref/word instance index))
  48   (defun %raw-instance-set/word (instance index new-value)
  49     (declare (type index index)
  50              (type sb!vm:word new-value))
  51     (%raw-instance-set/word instance index new-value))
  52
  53   (defun %raw-instance-ref/single (instance index)
  54     (declare (type index index))
  55     (%raw-instance-ref/single instance index))
  56   (defun %raw-instance-set/single (instance index new-value)
  57     (declare (type index index)
  58              (type single-float new-value))
  59     (%raw-instance-set/single instance index new-value))
  60
  61   (defun %raw-instance-ref/double (instance index)
  62     (declare (type index index))
  63     (%raw-instance-ref/double instance index))
  64   (defun %raw-instance-set/double (instance index new-value)
  65     (declare (type index index)
  66              (type double-float new-value))
  67     (%raw-instance-set/double instance index new-value))
  68
  69   (defun %raw-instance-ref/complex-single (instance index)
  70     (declare (type index index))
  71     (%raw-instance-ref/complex-single instance index))
  72   (defun %raw-instance-set/complex-single (instance index new-value)
  73     (declare (type index index)
  74              (type (complex single-float) new-value))
  75     (%raw-instance-set/complex-single instance index new-value))
  76
  77   (defun %raw-instance-ref/complex-double (instance index)
  78     (declare (type index index))
  79     (%raw-instance-ref/complex-double instance index))
  80   (defun %raw-instance-set/complex-double (instance index new-value)
  81     (declare (type index index)
  82              (type (complex double-float) new-value))
  83     (%raw-instance-set/complex-double instance index new-value))
  84 ) ; #!-HPPA
  85
  86 #!+hppa
  87 (progn
  88 (defun %raw-ref-single (vec index)
  89   (declare (type index index))
  90   (%raw-ref-single vec index))
  91
  92 (defun %raw-ref-double (vec index)
  93   (declare (type index index))
  94   (%raw-ref-double vec index))
  95
  96 #!+long-float
  97 (defun %raw-ref-long (vec index)
  98   (declare (type index index))
  99   (%raw-ref-long vec index))
 100
 101 (defun %raw-set-single (vec index val)
 102   (declare (type index index))
 103   (%raw-set-single vec index val))
 104
 105 (defun %raw-set-double (vec index val)
 106   (declare (type index index))
 107   (%raw-set-double vec index val))
 108
 109 #!+long-float
 110 (defun %raw-set-long (vec index val)
 111   (declare (type index index))
 112   (%raw-set-long vec index val))
 113
 114 (defun %raw-ref-complex-single (vec index)
 115   (declare (type index index))
 116   (%raw-ref-complex-single vec index))
 117
 118 (defun %raw-ref-complex-double (vec index)
 119   (declare (type index index))
 120   (%raw-ref-complex-double vec index))
 121
 122 #!+long-float
 123 (defun %raw-ref-complex-long (vec index)
 124   (declare (type index index))
 125   (%raw-ref-complex-long vec index))
 126
 127 (defun %raw-set-complex-single (vec index val)
 128   (declare (type index index))
 129   (%raw-set-complex-single vec index val))
 130
 131 (defun %raw-set-complex-double (vec index val)
 132   (declare (type index index))
 133   (%raw-set-complex-double vec index val))
 134
 135 #!+long-float
 136 (defun %raw-set-complex-long (vec index val)
 137   (declare (type index index))
 138   (%raw-set-complex-long vec index val))
 139 ) ; #!+HPPA
 140
 141 (defun %instance-layout (instance)
 142   (%instance-layout instance))
 143
 144 (defun %set-instance-layout (instance new-value)
 145   (%set-instance-layout instance new-value))
 146
 147 (defun %make-funcallable-instance (len)
 148   (%make-funcallable-instance len))
 149
 150 (defun funcallable-instance-p (x) (funcallable-instance-p x))
 151
 152 (defun %funcallable-instance-info (fin i)
 153   (%funcallable-instance-info fin i))
 154
 155 (defun %set-funcallable-instance-info (fin i new-value)
 156   (%set-funcallable-instance-info fin i new-value))
 157
 158 (defun funcallable-instance-fun (fin)
 159   (%funcallable-instance-function fin))
 160
 161 (defun (setf funcallable-instance-fun) (new-value fin)
 162   (setf (%funcallable-instance-function fin) new-value))
 163
 164 ;;; service function for structure constructors
 165 (defun %make-instance-with-layout (layout)
 166   ;; Make sure the object ends at a two-word boundary.  Note that this does
 167   ;; not affect the amount of memory used, since the allocator would add the
 168   ;; same padding anyway.  However, raw slots are indexed from the length of
 169   ;; the object as indicated in the header, so the pad word needs to be
 170   ;; included in that length to guarantee proper alignment of raw double float
 171   ;; slots, necessary for (at least) the SPARC backend.
 172   (let* ((length (layout-length layout))
 173          (result (%make-instance (+ length (mod (1+ length) 2)))))
 174     (setf (%instance-layout result) layout)
 175     result))
 176 \f
 177 ;;;; target-only parts of the DEFSTRUCT top level code
 178
 179 ;;; A list of hooks designating functions of one argument, the
 180 ;;; classoid, to be called when a defstruct is evaluated.
 181 (defvar *defstruct-hooks* nil)
 182
 183 ;;; Catch attempts to mess up definitions of symbols in the CL package.
 184 (defun protect-cl (symbol)
 185   (/show0 "entering PROTECT-CL, SYMBOL=..")
 186   (/hexstr symbol)
 187   (when (and *cold-init-complete-p*
 188              (eq (symbol-package symbol) *cl-package*))
 189     (cerror "Go ahead and patch the system."
 190             "attempting to modify a symbol in the COMMON-LISP package: ~S"
 191             symbol))
 192   (/show0 "leaving PROTECT-CL")
 193   (values))
 194
 195 ;;; the part of %DEFSTRUCT which makes sense only on the target SBCL
 196 ;;;
 197 ;;; (The "static" in the name is because it needs to be done not only
 198 ;;; in ordinary toplevel %DEFSTRUCT, but also in cold init as early as
 199 ;;; possible, to simulate static linking of structure functions as
 200 ;;; nearly as possible.)
 201 (defun %target-defstruct (dd layout)
 202   (declare (type defstruct-description dd))
 203   (declare (type layout layout))
 204
 205   (/show0 "entering %TARGET-DEFSTRUCT")
 206
 207   (remhash (dd-name dd) *typecheckfuns*)
 208
 209   ;; (Constructors aren't set up here, because constructors are
 210   ;; varied enough (possibly parsing any specified argument list)
 211   ;; that we can't reasonably implement them as closures, so we
 212   ;; implement them with DEFUN instead.)
 213
 214   ;; Set FDEFINITIONs for slot accessors.
 215   (dolist (dsd (dd-slots dd))
 216     (/show0 "doing FDEFINITION for slot accessor")
 217     (let ((accessor-name (dsd-accessor-name dsd)))
 218       ;; We mustn't step on any inherited accessors
 219       (unless (accessor-inherited-data accessor-name dd)
 220         (/show0 "ACCESSOR-NAME=..")
 221         (/hexstr accessor-name)
 222         (protect-cl accessor-name)
 223         (/hexstr "getting READER-FUN and WRITER-FUN")
 224         (multiple-value-bind (reader-fun writer-fun)
 225             (slot-accessor-funs dd dsd)
 226           (declare (type function reader-fun writer-fun))
 227           (/show0 "got READER-FUN and WRITER-FUN=..")
 228           (/hexstr reader-fun)
 229           (setf (symbol-function accessor-name) reader-fun)
 230           (unless (dsd-read-only dsd)
 231             (/show0 "setting FDEFINITION for WRITER-FUN=..")
 232             (/hexstr writer-fun)
 233             (setf (fdefinition `(setf ,accessor-name)) writer-fun))))))
 234
 235   ;; Set FDEFINITION for copier.
 236   (when (dd-copier-name dd)
 237     (/show0 "doing FDEFINITION for copier")
 238     (protect-cl (dd-copier-name dd))
 239     ;; We can't use COPY-STRUCTURE for other kinds of objects, notably
 240     ;; funcallable structures, since it returns a STRUCTURE-OBJECT.
 241     ;; (And funcallable instances don't need copiers anyway.)
 242     (aver (eql (dd-type dd) 'structure))
 243     (setf (symbol-function (dd-copier-name dd))
 244           ;; FIXME: should use a closure which checks arg type before copying
 245           #'copy-structure))
 246
 247   ;; Set FDEFINITION for predicate.
 248   (when (dd-predicate-name dd)
 249     (/show0 "doing FDEFINITION for predicate")
 250     (protect-cl (dd-predicate-name dd))
 251     (setf (symbol-function (dd-predicate-name dd))
 252           (ecase (dd-type dd)
 253             ;; structures with LAYOUTs
 254             ((structure funcallable-structure)
 255              (/show0 "with-LAYOUT case")
 256              (lambda (object)
 257                (locally ; <- to keep SAFETY 0 from affecting arg count checking
 258                  (declare (optimize (speed 3) (safety 0)))
 259                  (/noshow0 "in with-LAYOUT structure predicate closure, OBJECT,LAYOUT=..")
 260                  (/nohexstr object)
 261                  (/nohexstr layout)
 262                  (typep-to-layout object layout))))
 263             ;; structures with no LAYOUT (i.e. :TYPE VECTOR or :TYPE LIST)
 264             ;;
 265             ;; FIXME: should handle the :NAMED T case in these cases
 266             (vector
 267              (/show0 ":TYPE VECTOR case")
 268              #'vectorp)
 269             (list
 270              (/show0 ":TYPE LIST case")
 271              #'listp))))
 272
 273   (when (dd-doc dd)
 274     (setf (fdocumentation (dd-name dd) 'structure)
 275           (dd-doc dd)))
 276
 277   ;; the BOUNDP test here is to get past cold-init.
 278   (when (boundp '*defstruct-hooks*)
 279     (dolist (fun *defstruct-hooks*)
 280       (funcall fun (find-classoid (dd-name dd)))))
 281
 282   (/show0 "leaving %TARGET-DEFSTRUCT")
 283   (values))
 284 \f
 285 ;;;; generating out-of-line slot accessor functions
 286
 287 ;;; FIXME: Ideally, the presence of the type checks in the functions
 288 ;;; here would be conditional on the optimization policy at the point
 289 ;;; of expansion of DEFSTRUCT. (For now we're just doing the simpler
 290 ;;; thing, putting in the type checks unconditionally.)
 291
 292 ;;; KLUDGE: Why use this closure approach at all?  The macrology in
 293 ;;; SLOT-ACCESSOR-FUNS seems to be half stub, half OAOOM to me.  --DFL
 294
 295 ;;; Return (VALUES SLOT-READER-FUN SLOT-WRITER-FUN).
 296 (defun slot-accessor-funs (dd dsd)
 297
 298   #+sb-xc (/show0 "entering SLOT-ACCESSOR-FUNS")
 299
 300   ;; various code generators
 301   ;;
 302   ;; Note: They're only minimally parameterized, and cavalierly grab
 303   ;; things like INSTANCE and DSD-INDEX from the namespace they're
 304   ;; expanded in.
 305   (macrolet (;; code shared between funcallable instance case and the
 306              ;; ordinary STRUCTURE-OBJECT case: Handle native
 307              ;; structures with LAYOUTs and (possibly) raw slots.
 308              (%native-slot-accessor-funs (dd-ref-fun-name)
 309                (let ((instance-type-check-form
 310                       '(%check-structure-type-from-layout instance layout)))
 311                  (/show "macroexpanding %NATIVE-SLOT-ACCESSOR-FUNS" dd-ref-fun-name instance-type-check-form)
 312                  `(let ((layout (dd-layout-or-lose dd))
 313                         (dsd-raw-type (dsd-raw-type dsd)))
 314                     #+sb-xc (/show0 "in %NATIVE-SLOT-ACCESSOR-FUNS macroexpanded code")
 315                     ;; Map over all the possible RAW-TYPEs, compiling
 316                     ;; a different closure function for each one, so
 317                     ;; that once the COND over RAW-TYPEs happens (at
 318                     ;; the time closure is allocated) there are no
 319                     ;; more decisions to be made and things execute
 320                     ;; reasonably efficiently.
 321                     (cond
 322                      ;; nonraw slot case
 323                      ((eql dsd-raw-type t)
 324                       #+sb-xc (/show0 "in nonraw slot case")
 325                       (%slotplace-accessor-funs
 326                        (,dd-ref-fun-name instance dsd-index)
 327                        ,instance-type-check-form))
 328                      ;; raw slot cases
 329                      ,@(mapcar (lambda (rtd)
 330                                  (let ((raw-type (raw-slot-data-raw-type rtd))
 331                                        (accessor-name
 332                                         (raw-slot-data-accessor-name rtd)))
 333                                    `((equal dsd-raw-type ',raw-type)
 334                                      #+sb-xc (/show0 "in raw slot case")
 335                                      (%slotplace-accessor-funs
 336                                       (,accessor-name instance dsd-index)
 337                                       ,instance-type-check-form))))
 338                                *raw-slot-data-list*)
 339                      ;; oops
 340                      (t
 341                       (bug "unexpected DSD-RAW-TYPE ~S" dsd-raw-type))))))
 342              ;; code shared between DEFSTRUCT :TYPE LIST and
 343              ;; DEFSTRUCT :TYPE VECTOR cases: Handle the "typed
 344              ;; structure" case, with no LAYOUTs and no raw slots.
 345              (%colontyped-slot-accessor-funs () (error "stub"))
 346              ;; the common structure of the raw-slot and not-raw-slot
 347              ;; cases, defined in terms of the writable SLOTPLACE. All
 348              ;; possible flavors of slot access should be able to pass
 349              ;; through here.
 350              (%slotplace-accessor-funs (slotplace instance-type-check-form)
 351                (/show "macroexpanding %SLOTPLACE-ACCESSOR-FUNS" slotplace instance-type-check-form)
 352                `(let ((typecheckfun (typespec-typecheckfun dsd-type)))
 353                   (values (if (dsd-safe-p dsd)
 354                               (lambda (instance)
 355                                 (/noshow0 "in %SLOTPLACE-ACCESSOR-FUNS-defined reader")
 356                                 ,instance-type-check-form
 357                                 (/noshow0 "back from INSTANCE-TYPE-CHECK-FORM")
 358                                 ,slotplace)
 359                               (lambda (instance)
 360                                 (/noshow0 "in %SLOTPLACE-ACCESSOR-FUNS-defined reader")
 361                                 ,instance-type-check-form
 362                                 (/noshow0 "back from INSTANCE-TYPE-CHECK-FORM")
 363                                 (let ((value ,slotplace))
 364                                   (funcall typecheckfun value)
 365                                   value)))
 366                           (lambda (new-value instance)
 367                             (/noshow0 "in %SLOTPLACE-ACCESSOR-FUNS-defined writer")
 368                             ,instance-type-check-form
 369                             (/noshow0 "back from INSTANCE-TYPE-CHECK-FORM")
 370                             (funcall typecheckfun new-value)
 371                             (/noshow0 "back from TYPECHECKFUN")
 372                             (setf ,slotplace new-value))))))
 373
 374     (let ((dsd-index (dsd-index dsd))
 375           (dsd-type (dsd-type dsd)))
 376
 377       #+sb-xc (/show0 "got DSD-TYPE=..")
 378       #+sb-xc (/hexstr dsd-type)
 379       (ecase (dd-type dd)
 380
 381         ;; native structures
 382         (structure
 383          #+sb-xc (/show0 "case of DSD-TYPE = STRUCTURE")
 384          (%native-slot-accessor-funs %instance-ref))
 385
 386         ;; structures with the :TYPE option
 387
 388         ;; FIXME: Worry about these later..
 389         #|
 390         ;; In :TYPE LIST and :TYPE VECTOR structures, ANSI specifies the
 391         ;; layout completely, so that raw slots are impossible.
 392         (list
 393          (dd-type-slot-accessor-funs nth-but-with-sane-arg-order
 394                                  `(%check-structure-type-from-dd
 395                                  :maybe-raw-p nil))
 396         (vector
 397          (dd-type-slot-accessor-funs aref
 398                                  :maybe-raw-p nil)))
 399         |#
 400         ))))
 401 \f
 402 ;;; Copy any old kind of structure.
 403 (defun copy-structure (structure)
 404   #!+sb-doc
 405   "Return a copy of STRUCTURE with the same (EQL) slot values."
 406   (declare (type structure-object structure))
 407   (let* ((len (%instance-length structure))
 408          (res (%make-instance len))
 409          (layout (%instance-layout structure))
 410          (nuntagged (layout-n-untagged-slots layout)))
 411
 412     (declare (type index len))
 413     (when (layout-invalid layout)
 414       (error "attempt to copy an obsolete structure:~%  ~S" structure))
 415
 416     ;; Copy ordinary slots.
 417     (dotimes (i (- len nuntagged))
 418       (declare (type index i))
 419       (setf (%instance-ref res i)
 420             (%instance-ref structure i)))
 421
 422     ;; Copy raw slots.
 423     (dotimes (i nuntagged)
 424       (declare (type index i))
 425       (setf (%raw-instance-ref/word res i)
 426             (%raw-instance-ref/word structure i)))
 427
 428     res))
 429 \f
 430 ;;; default PRINT-OBJECT method
 431
 432 (defun %print-structure-sans-layout-info (name stream)
 433   ;; KLUDGE: during PCL build debugging, we can sometimes
 434   ;; attempt to print out a PCL object (with null LAYOUT-INFO).
 435   (pprint-logical-block (stream nil :prefix "#<" :suffix ">")
 436     (prin1 name stream)
 437     (write-char #\space stream)
 438     (write-string "(no LAYOUT-INFO)" stream)))
 439
 440 (defun %print-structure-sans-slots (name stream)
 441   ;; the structure type doesn't count as a component for *PRINT-LEVEL*
 442   ;; processing. We can likewise elide the logical block processing,
 443   ;; since all we have to print is the type name. -- CSR, 2004-10-05
 444   (write-string "#S(" stream)
 445   (prin1 name stream)
 446   (write-char #\) stream))
 447
 448 (defun %default-structure-pretty-print (structure stream)
 449   (let* ((layout (%instance-layout structure))
 450          (name (classoid-name (layout-classoid layout)))
 451          (dd (layout-info layout)))
 452     (cond ((not dd)
 453            (%print-structure-sans-layout-info name stream))
 454           ((not (dd-slots dd))
 455            (%print-structure-sans-slots name stream))
 456           (t
 457            (pprint-logical-block (stream nil :prefix "#S(" :suffix ")")
 458              (prin1 name stream)
 459              (let ((remaining-slots (dd-slots dd)))
 460                (when remaining-slots
 461                  (write-char #\space stream)
 462                  ;; CMU CL had (PPRINT-INDENT :BLOCK 2 STREAM) here,
 463                  ;; but I can't see why. -- WHN 20000205
 464                  (pprint-newline :linear stream)
 465                  (loop
 466                    (pprint-pop)
 467                    (let ((slot (pop remaining-slots)))
 468                      (write-char #\: stream)
 469                      (output-symbol-name (symbol-name (dsd-name slot)) stream)
 470                      (write-char #\space stream)
 471                      (pprint-newline :miser stream)
 472                      (output-object (funcall (fdefinition (dsd-accessor-name slot))
 473                                              structure)
 474                                     stream)
 475                      (when (null remaining-slots)
 476                        (return))
 477                      (write-char #\space stream)
 478                      (pprint-newline :linear stream))))))))))
 479
 480 (defun %default-structure-ugly-print (structure stream)
 481   (let* ((layout (%instance-layout structure))
 482          (name (classoid-name (layout-classoid layout)))
 483          (dd (layout-info layout)))
 484     (cond ((not dd)
 485            (%print-structure-sans-layout-info name stream))
 486           ((not (dd-slots dd))
 487            (%print-structure-sans-slots name stream))
 488           (t
 489            (descend-into (stream)
 490              (write-string "#S(" stream)
 491              (prin1 name stream)
 492              (do ((index 0 (1+ index))
 493                   (remaining-slots (dd-slots dd) (cdr remaining-slots)))
 494                  ((or (null remaining-slots)
 495                       (and (not *print-readably*)
 496                            *print-length*
 497                            (>= index *print-length*)))
 498                   (if (null remaining-slots)
 499                       (write-string ")" stream)
 500                       (write-string " ...)" stream)))
 501                (declare (type index index))
 502                (write-string " :" stream)
 503                (let ((slot (first remaining-slots)))
 504                  (output-symbol-name (symbol-name (dsd-name slot)) stream)
 505                  (write-char #\space stream)
 506                  (output-object
 507                   (funcall (fdefinition (dsd-accessor-name slot))
 508                            structure)
 509                   stream))))))))
 510
 511 (defun default-structure-print (structure stream depth)
 512   (declare (ignore depth))
 513   (cond ((funcallable-instance-p structure)
 514          (print-unreadable-object (structure stream :identity t :type t)))
 515         (*print-pretty*
 516          (%default-structure-pretty-print structure stream))
 517         (t
 518          (%default-structure-ugly-print structure stream))))
 519
 520 (def!method print-object ((x structure-object) stream)
 521   (default-structure-print x stream *current-level-in-print*))
 522 \f
 523 ;;;; testing structure types
 524
 525 ;;; Return true if OBJ is an object of the structure type
 526 ;;; corresponding to LAYOUT. This is called by the accessor closures,
 527 ;;; which have a handle on the type's LAYOUT.
 528 ;;;
 529 ;;; FIXME: This is fairly big, so it should probably become
 530 ;;; MAYBE-INLINE instead of INLINE, or its inlineness should become
 531 ;;; conditional (probably through DEFTRANSFORM) on (> SPEED SPACE). Or
 532 ;;; else we could fix things up so that the things which call it are
 533 ;;; all closures, so that it's expanded only in a small number of
 534 ;;; places.
 535 #!-sb-fluid (declaim (inline typep-to-layout))
 536 (defun typep-to-layout (obj layout)
 537   (declare (type layout layout) (optimize (speed 3) (safety 0)))
 538   (/noshow0 "entering TYPEP-TO-LAYOUT, OBJ,LAYOUT=..")
 539   (/nohexstr obj)
 540   (/nohexstr layout)
 541   (when (layout-invalid layout)
 542     (error "An obsolete structure accessor function was called."))
 543   (/noshow0 "back from testing LAYOUT-INVALID LAYOUT")
 544   (and (%instancep obj)
 545        (let ((obj-layout (%instance-layout obj)))
 546          (cond ((eq obj-layout layout)
 547                 ;; (In this case OBJ-LAYOUT can't be invalid, because
 548                 ;; we determined LAYOUT is valid in the test above.)
 549                 (/noshow0 "EQ case")
 550                 t)
 551                ((layout-invalid obj-layout)
 552                 (/noshow0 "LAYOUT-INVALID case")
 553                 (error 'layout-invalid
 554                        :expected-type (layout-classoid obj-layout)
 555                        :datum obj))
 556                (t
 557                 (let ((depthoid (layout-depthoid layout)))
 558                   (/noshow0 "DEPTHOID case, DEPTHOID,LAYOUT-INHERITS=..")
 559                   (/nohexstr depthoid)
 560                   (/nohexstr layout-inherits)
 561                   (and (> (layout-depthoid obj-layout) depthoid)
 562                        (eq (svref (layout-inherits obj-layout) depthoid)
 563                            layout))))))))
 564 \f
 565 ;;;; checking structure types
 566
 567 ;;; Check that X is an instance of the named structure type.
 568 (defmacro %check-structure-type-from-name (x name)
 569   `(%check-structure-type-from-layout ,x ,(compiler-layout-or-lose name)))
 570
 571 ;;; Check that X is a structure of the type described by DD.
 572 (defmacro %check-structure-type-from-dd (x dd)
 573   (declare (type defstruct-description dd))
 574   (let ((class-name (dd-name dd)))
 575     (ecase (dd-type dd)
 576       ((structure funcallable-instance)
 577        `(%check-structure-type-from-layout
 578          ,x
 579          ,(compiler-layout-or-lose class-name)))
 580       ((vector)
 581        (with-unique-names (xx)
 582          `(let ((,xx ,x))
 583             (declare (type vector ,xx))
 584             ,@(when (dd-named dd)
 585                 `((unless (eql (aref ,xx 0) ',class-name)
 586                     (error
 587                      'simple-type-error
 588                      :datum (aref ,xx 0)
 589                      :expected-type `(member ,class-name)
 590                      :format-control
 591                      "~@<missing name in instance of ~
 592                       VECTOR-typed structure ~S: ~2I~_S~:>"
 593                      :format-arguments (list ',class-name ,xx)))))
 594             (values))))
 595       ((list)
 596        (with-unique-names (xx)
 597          `(let ((,xx ,x))
 598             (declare (type list ,xx))
 599             ,@(when (dd-named dd)
 600                 `((unless (eql (first ,xx) ',class-name)
 601                     (error
 602                      'simple-type-error
 603                      :datum (aref ,xx 0)
 604                      :expected-type `(member ,class-name)
 605                      :format-control
 606                      "~@<missing name in instance of LIST-typed structure ~S: ~
 607                       ~2I~_S~:>"
 608                      :format-arguments (list ',class-name ,xx)))))
 609             (values)))))))
 610
 611 ;;; Check that X is an instance of the structure class with layout LAYOUT.
 612 (defun %check-structure-type-from-layout (x layout)
 613   (unless (typep-to-layout x layout)
 614     (error 'type-error
 615            :datum x
 616            :expected-type (classoid-name (layout-classoid layout))))
 617   (values))
 618
 619 \f
 620 (/show0 "target-defstruct.lisp end of file")