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 ;;; Normally IR2 converted, definition needed for interpreted structure
  35 ;;; constructors only.
  36 #!+sb-eval
  37 (defun %make-structure-instance (dd slot-specs &rest slot-values)
  38   (let ((instance (%make-instance (dd-instance-length dd))))
  39     (setf (%instance-layout instance) (dd-layout-or-lose dd))
  40     (mapc (lambda (spec value)
  41             (destructuring-bind (raw-type . index) (cdr spec)
  42               (macrolet ((make-case ()
  43                            `(ecase raw-type
  44                               ((t)
  45                                (setf (%instance-ref instance index) value))
  46                               ,@(mapcar
  47                                  (lambda (rsd)
  48                                    `(,(raw-slot-data-raw-type rsd)
  49                                       (setf (,(raw-slot-data-accessor-name rsd)
  50                                               instance index)
  51                                             value)))
  52                                  *raw-slot-data-list*))))
  53                 (make-case))))
  54           slot-specs slot-values)
  55     instance))
  56
  57 #!-hppa
  58 (progn
  59   (defun %raw-instance-ref/word (instance index)
  60     (declare (type index index))
  61     (%raw-instance-ref/word instance index))
  62   (defun %raw-instance-set/word (instance index new-value)
  63     (declare (type index index)
  64              (type sb!vm:word new-value))
  65     (%raw-instance-set/word instance index new-value))
  66
  67   (defun %raw-instance-ref/single (instance index)
  68     (declare (type index index))
  69     (%raw-instance-ref/single instance index))
  70   (defun %raw-instance-set/single (instance index new-value)
  71     (declare (type index index)
  72              (type single-float new-value))
  73     (%raw-instance-set/single instance index new-value))
  74
  75   (defun %raw-instance-ref/double (instance index)
  76     (declare (type index index))
  77     (%raw-instance-ref/double instance index))
  78   (defun %raw-instance-set/double (instance index new-value)
  79     (declare (type index index)
  80              (type double-float new-value))
  81     (%raw-instance-set/double instance index new-value))
  82
  83   (defun %raw-instance-ref/complex-single (instance index)
  84     (declare (type index index))
  85     (%raw-instance-ref/complex-single instance index))
  86   (defun %raw-instance-set/complex-single (instance index new-value)
  87     (declare (type index index)
  88              (type (complex single-float) new-value))
  89     (%raw-instance-set/complex-single instance index new-value))
  90
  91   (defun %raw-instance-ref/complex-double (instance index)
  92     (declare (type index index))
  93     (%raw-instance-ref/complex-double instance index))
  94   (defun %raw-instance-set/complex-double (instance index new-value)
  95     (declare (type index index)
  96              (type (complex double-float) new-value))
  97     (%raw-instance-set/complex-double instance index new-value))
  98 ) ; #!-HPPA
  99
 100 #!+hppa
 101 (progn
 102 (defun %raw-ref-single (vec index)
 103   (declare (type index index))
 104   (%raw-ref-single vec index))
 105
 106 (defun %raw-ref-double (vec index)
 107   (declare (type index index))
 108   (%raw-ref-double vec index))
 109
 110 #!+long-float
 111 (defun %raw-ref-long (vec index)
 112   (declare (type index index))
 113   (%raw-ref-long vec index))
 114
 115 (defun %raw-set-single (vec index val)
 116   (declare (type index index))
 117   (%raw-set-single vec index val))
 118
 119 (defun %raw-set-double (vec index val)
 120   (declare (type index index))
 121   (%raw-set-double vec index val))
 122
 123 #!+long-float
 124 (defun %raw-set-long (vec index val)
 125   (declare (type index index))
 126   (%raw-set-long vec index val))
 127
 128 (defun %raw-ref-complex-single (vec index)
 129   (declare (type index index))
 130   (%raw-ref-complex-single vec index))
 131
 132 (defun %raw-ref-complex-double (vec index)
 133   (declare (type index index))
 134   (%raw-ref-complex-double vec index))
 135
 136 #!+long-float
 137 (defun %raw-ref-complex-long (vec index)
 138   (declare (type index index))
 139   (%raw-ref-complex-long vec index))
 140
 141 (defun %raw-set-complex-single (vec index val)
 142   (declare (type index index))
 143   (%raw-set-complex-single vec index val))
 144
 145 (defun %raw-set-complex-double (vec index val)
 146   (declare (type index index))
 147   (%raw-set-complex-double vec index val))
 148
 149 #!+long-float
 150 (defun %raw-set-complex-long (vec index val)
 151   (declare (type index index))
 152   (%raw-set-complex-long vec index val))
 153 ) ; #!+HPPA
 154
 155 (defun %instance-layout (instance)
 156   (%instance-layout instance))
 157
 158 (defun %set-instance-layout (instance new-value)
 159   (%set-instance-layout instance new-value))
 160
 161 (defun %make-funcallable-instance (len)
 162   (%make-funcallable-instance len))
 163
 164 (defun funcallable-instance-p (x) (funcallable-instance-p x))
 165
 166 (defun %funcallable-instance-info (fin i)
 167   (%funcallable-instance-info fin i))
 168
 169 (defun %set-funcallable-instance-info (fin i new-value)
 170   (%set-funcallable-instance-info fin i new-value))
 171
 172 (defun funcallable-instance-fun (fin)
 173   (%funcallable-instance-function fin))
 174
 175 (defun (setf funcallable-instance-fun) (new-value fin)
 176   (setf (%funcallable-instance-function fin) new-value))
 177 \f
 178 ;;;; target-only parts of the DEFSTRUCT top level code
 179
 180 ;;; A list of hooks designating functions of one argument, the
 181 ;;; classoid, to be called when a defstruct is evaluated.
 182 (defvar *defstruct-hooks* nil)
 183
 184 ;;; Catch attempts to mess up definitions of symbols in the CL package.
 185 (defun protect-cl (symbol)
 186   (/show0 "entering PROTECT-CL, SYMBOL=..")
 187   (/hexstr symbol)
 188   (when (and *cold-init-complete-p*
 189              (eq (symbol-package symbol) *cl-package*))
 190     (cerror "Go ahead and patch the system."
 191             "attempting to modify a symbol in the COMMON-LISP package: ~S"
 192             symbol))
 193   (/show0 "leaving PROTECT-CL")
 194   (values))
 195
 196 ;;; the part of %DEFSTRUCT which makes sense only on the target SBCL
 197 ;;;
 198 ;;; (The "static" in the name is because it needs to be done not only
 199 ;;; in ordinary toplevel %DEFSTRUCT, but also in cold init as early as
 200 ;;; possible, to simulate static linking of structure functions as
 201 ;;; nearly as possible.)
 202 (defun %target-defstruct (dd layout)
 203   (declare (type defstruct-description dd))
 204   (declare (type layout layout))
 205
 206   (/show0 "entering %TARGET-DEFSTRUCT")
 207
 208   (remhash (dd-name dd) *typecheckfuns*)
 209
 210   ;; (Constructors aren't set up here, because constructors are
 211   ;; varied enough (possibly parsing any specified argument list)
 212   ;; that we can't reasonably implement them as closures, so we
 213   ;; implement them with DEFUN instead.)
 214
 215   ;; Set FDEFINITIONs for slot accessors.
 216   (dolist (dsd (dd-slots dd))
 217     (/show0 "doing FDEFINITION for slot accessor")
 218     (let ((accessor-name (dsd-accessor-name dsd)))
 219       ;; We mustn't step on any inherited accessors
 220       (unless (accessor-inherited-data accessor-name dd)
 221         (/show0 "ACCESSOR-NAME=..")
 222         (/hexstr accessor-name)
 223         (protect-cl accessor-name)
 224         (/hexstr "getting READER-FUN and WRITER-FUN")
 225         (multiple-value-bind (reader-fun writer-fun)
 226             (slot-accessor-funs dd dsd)
 227           (declare (type function reader-fun writer-fun))
 228           (/show0 "got READER-FUN and WRITER-FUN=..")
 229           (/hexstr reader-fun)
 230           (setf (symbol-function accessor-name) reader-fun)
 231           (unless (dsd-read-only dsd)
 232             (/show0 "setting FDEFINITION for WRITER-FUN=..")
 233             (/hexstr writer-fun)
 234             (setf (fdefinition `(setf ,accessor-name)) writer-fun))))))
 235
 236   ;; Set FDEFINITION for copier.
 237   (when (dd-copier-name dd)
 238     (/show0 "doing FDEFINITION for copier")
 239     (protect-cl (dd-copier-name dd))
 240     ;; We can't use COPY-STRUCTURE for other kinds of objects, notably
 241     ;; funcallable structures, since it returns a STRUCTURE-OBJECT.
 242     ;; (And funcallable instances don't need copiers anyway.)
 243     (aver (eql (dd-type dd) 'structure))
 244     (setf (symbol-function (dd-copier-name dd))
 245           ;; FIXME: should use a closure which checks arg type before copying
 246           #'copy-structure))
 247
 248   ;; Set FDEFINITION for predicate.
 249   (when (dd-predicate-name dd)
 250     (/show0 "doing FDEFINITION for predicate")
 251     (protect-cl (dd-predicate-name dd))
 252     (setf (symbol-function (dd-predicate-name dd))
 253           (ecase (dd-type dd)
 254             ;; structures with LAYOUTs
 255             ((structure funcallable-structure)
 256              (/show0 "with-LAYOUT case")
 257              (lambda (object)
 258                (locally ; <- to keep SAFETY 0 from affecting arg count checking
 259                  (declare (optimize (speed 3) (safety 0)))
 260                  (/noshow0 "in with-LAYOUT structure predicate closure, OBJECT,LAYOUT=..")
 261                  (/nohexstr object)
 262                  (/nohexstr layout)
 263                  (typep-to-layout object layout))))
 264             ;; structures with no LAYOUT (i.e. :TYPE VECTOR or :TYPE LIST)
 265             ;;
 266             ;; FIXME: should handle the :NAMED T case in these cases
 267             (vector
 268              (/show0 ":TYPE VECTOR case")
 269              #'vectorp)
 270             (list
 271              (/show0 ":TYPE LIST case")
 272              #'listp))))
 273
 274   (when (dd-doc dd)
 275     (setf (fdocumentation (dd-name dd) 'structure)
 276           (dd-doc dd)))
 277
 278   ;; the BOUNDP test here is to get past cold-init.
 279   (when (boundp '*defstruct-hooks*)
 280     (dolist (fun *defstruct-hooks*)
 281       (funcall fun (find-classoid (dd-name dd)))))
 282
 283   (/show0 "leaving %TARGET-DEFSTRUCT")
 284   (values))
 285 \f
 286 ;;;; generating out-of-line slot accessor functions
 287
 288 ;;; FIXME: Ideally, the presence of the type checks in the functions
 289 ;;; here would be conditional on the optimization policy at the point
 290 ;;; of expansion of DEFSTRUCT. (For now we're just doing the simpler
 291 ;;; thing, putting in the type checks unconditionally.)
 292
 293 ;;; KLUDGE: Why use this closure approach at all?  The macrology in
 294 ;;; SLOT-ACCESSOR-FUNS seems to be half stub, half OAOOM to me.  --DFL
 295
 296 ;;; Return (VALUES SLOT-READER-FUN SLOT-WRITER-FUN).
 297 (defun slot-accessor-funs (dd dsd)
 298
 299   #+sb-xc (/show0 "entering SLOT-ACCESSOR-FUNS")
 300
 301   ;; various code generators
 302   ;;
 303   ;; Note: They're only minimally parameterized, and cavalierly grab
 304   ;; things like INSTANCE and DSD-INDEX from the namespace they're
 305   ;; expanded in.
 306   (macrolet (;; code shared between funcallable instance case and the
 307              ;; ordinary STRUCTURE-OBJECT case: Handle native
 308              ;; structures with LAYOUTs and (possibly) raw slots.
 309              (%native-slot-accessor-funs (dd-ref-fun-name)
 310                (let ((instance-type-check-form
 311                       '(%check-structure-type-from-layout instance layout)))
 312                  (/show "macroexpanding %NATIVE-SLOT-ACCESSOR-FUNS" dd-ref-fun-name instance-type-check-form)
 313                  `(let ((layout (dd-layout-or-lose dd))
 314                         (dsd-raw-type (dsd-raw-type dsd)))
 315                     #+sb-xc (/show0 "in %NATIVE-SLOT-ACCESSOR-FUNS macroexpanded code")
 316                     ;; Map over all the possible RAW-TYPEs, compiling
 317                     ;; a different closure function for each one, so
 318                     ;; that once the COND over RAW-TYPEs happens (at
 319                     ;; the time closure is allocated) there are no
 320                     ;; more decisions to be made and things execute
 321                     ;; reasonably efficiently.
 322                     (cond
 323                      ;; nonraw slot case
 324                      ((eql dsd-raw-type t)
 325                       #+sb-xc (/show0 "in nonraw slot case")
 326                       (%slotplace-accessor-funs
 327                        (,dd-ref-fun-name instance dsd-index)
 328                        ,instance-type-check-form))
 329                      ;; raw slot cases
 330                      ,@(mapcar (lambda (rtd)
 331                                  (let ((raw-type (raw-slot-data-raw-type rtd))
 332                                        (accessor-name
 333                                         (raw-slot-data-accessor-name rtd)))
 334                                    `((equal dsd-raw-type ',raw-type)
 335                                      #+sb-xc (/show0 "in raw slot case")
 336                                      (%slotplace-accessor-funs
 337                                       (,accessor-name instance dsd-index)
 338                                       ,instance-type-check-form))))
 339                                *raw-slot-data-list*)
 340                      ;; oops
 341                      (t
 342                       (bug "unexpected DSD-RAW-TYPE ~S" dsd-raw-type))))))
 343              ;; code shared between DEFSTRUCT :TYPE LIST and
 344              ;; DEFSTRUCT :TYPE VECTOR cases: Handle the "typed
 345              ;; structure" case, with no LAYOUTs and no raw slots.
 346              (%colontyped-slot-accessor-funs () (error "stub"))
 347              ;; the common structure of the raw-slot and not-raw-slot
 348              ;; cases, defined in terms of the writable SLOTPLACE. All
 349              ;; possible flavors of slot access should be able to pass
 350              ;; through here.
 351              (%slotplace-accessor-funs (slotplace instance-type-check-form)
 352                (/show "macroexpanding %SLOTPLACE-ACCESSOR-FUNS" slotplace instance-type-check-form)
 353                `(let ((typecheckfun (typespec-typecheckfun dsd-type)))
 354                   (values (if (dsd-safe-p dsd)
 355                               (lambda (instance)
 356                                 (/noshow0 "in %SLOTPLACE-ACCESSOR-FUNS-defined reader")
 357                                 ,instance-type-check-form
 358                                 (/noshow0 "back from INSTANCE-TYPE-CHECK-FORM")
 359                                 ,slotplace)
 360                               (lambda (instance)
 361                                 (/noshow0 "in %SLOTPLACE-ACCESSOR-FUNS-defined reader")
 362                                 ,instance-type-check-form
 363                                 (/noshow0 "back from INSTANCE-TYPE-CHECK-FORM")
 364                                 (let ((value ,slotplace))
 365                                   (funcall typecheckfun value)
 366                                   value)))
 367                           (lambda (new-value instance)
 368                             (/noshow0 "in %SLOTPLACE-ACCESSOR-FUNS-defined writer")
 369                             ,instance-type-check-form
 370                             (/noshow0 "back from INSTANCE-TYPE-CHECK-FORM")
 371                             (funcall typecheckfun new-value)
 372                             (/noshow0 "back from TYPECHECKFUN")
 373                             (setf ,slotplace new-value))))))
 374
 375     (let ((dsd-index (dsd-index dsd))
 376           (dsd-type (dsd-type dsd)))
 377
 378       #+sb-xc (/show0 "got DSD-TYPE=..")
 379       #+sb-xc (/hexstr dsd-type)
 380       (ecase (dd-type dd)
 381
 382         ;; native structures
 383         (structure
 384          #+sb-xc (/show0 "case of DSD-TYPE = STRUCTURE")
 385          (%native-slot-accessor-funs %instance-ref))
 386
 387         ;; structures with the :TYPE option
 388
 389         ;; FIXME: Worry about these later..
 390         #|
 391         ;; In :TYPE LIST and :TYPE VECTOR structures, ANSI specifies the
 392         ;; layout completely, so that raw slots are impossible.
 393         (list
 394          (dd-type-slot-accessor-funs nth-but-with-sane-arg-order
 395                                  `(%check-structure-type-from-dd
 396                                  :maybe-raw-p nil))
 397         (vector
 398          (dd-type-slot-accessor-funs aref
 399                                  :maybe-raw-p nil)))
 400         |#
 401         ))))
 402 \f
 403 ;;; Copy any old kind of structure.
 404 (defun copy-structure (structure)
 405   #!+sb-doc
 406   "Return a copy of STRUCTURE with the same (EQL) slot values."
 407   (declare (type structure-object structure))
 408   (let* ((len (%instance-length structure))
 409          (res (%make-instance len))
 410          (layout (%instance-layout structure))
 411          (nuntagged (layout-n-untagged-slots layout)))
 412
 413     (declare (type index len))
 414     (when (layout-invalid layout)
 415       (error "attempt to copy an obsolete structure:~%  ~S" structure))
 416
 417     ;; Copy ordinary slots and layout.
 418     (dotimes (i (- len nuntagged))
 419       (declare (type index i))
 420       (setf (%instance-ref res i)
 421             (%instance-ref structure i)))
 422
 423     ;; Copy raw slots.
 424     (dotimes (i nuntagged)
 425       (declare (type index i))
 426       (setf (%raw-instance-ref/word res i)
 427             (%raw-instance-ref/word structure i)))
 428
 429     res))
 430
 431 \f
 432
 433 ;; Do an EQUALP comparison on the raw slots (only, not the normal slots) of a
 434 ;; structure.
 435 (defun raw-instance-slots-equalp (layout x y)
 436   ;; This implementation sucks, but hopefully EQUALP on raw structures
 437   ;; won't be a major bottleneck for anyone. It'd be tempting to do
 438   ;; all this with %RAW-INSTANCE-REF/WORD and bitwise comparisons, but
 439   ;; that'll fail in some cases. For example -0.0 and 0.0 are EQUALP
 440   ;; but have different bit patterns. -- JES, 2007-08-21
 441   (loop with i = -1
 442         for dsd in (dd-slots (layout-info layout))
 443         for raw-type = (dsd-raw-type dsd)
 444         for rsd = (when raw-type
 445                     (find raw-type
 446                           *raw-slot-data-list*
 447                           :key 'raw-slot-data-raw-type))
 448         for accessor = (when rsd
 449                          (raw-slot-data-accessor-name rsd))
 450         always (or (not accessor)
 451                    (progn
 452                      (incf i)
 453                      (equalp (funcall accessor x i)
 454                              (funcall accessor y i))))))
 455 \f
 456 ;;; default PRINT-OBJECT method
 457
 458 (defun %print-structure-sans-layout-info (name stream)
 459   ;; KLUDGE: during PCL build debugging, we can sometimes
 460   ;; attempt to print out a PCL object (with null LAYOUT-INFO).
 461   (pprint-logical-block (stream nil :prefix "#<" :suffix ">")
 462     (prin1 name stream)
 463     (write-char #\space stream)
 464     (write-string "(no LAYOUT-INFO)" stream)))
 465
 466 (defun %print-structure-sans-slots (name stream)
 467   ;; the structure type doesn't count as a component for *PRINT-LEVEL*
 468   ;; processing. We can likewise elide the logical block processing,
 469   ;; since all we have to print is the type name. -- CSR, 2004-10-05
 470   (write-string "#S(" stream)
 471   (prin1 name stream)
 472   (write-char #\) stream))
 473
 474 (defun %default-structure-pretty-print (structure stream)
 475   (let* ((layout (%instance-layout structure))
 476          (name (classoid-name (layout-classoid layout)))
 477          (dd (layout-info layout)))
 478     (cond ((not dd)
 479            (%print-structure-sans-layout-info name stream))
 480           ((not (dd-slots dd))
 481            (%print-structure-sans-slots name stream))
 482           (t
 483            (pprint-logical-block (stream nil :prefix "#S(" :suffix ")")
 484              (prin1 name stream)
 485              (let ((remaining-slots (dd-slots dd)))
 486                (when remaining-slots
 487                  (write-char #\space stream)
 488                  ;; CMU CL had (PPRINT-INDENT :BLOCK 2 STREAM) here,
 489                  ;; but I can't see why. -- WHN 20000205
 490                  (pprint-newline :linear stream)
 491                  (loop
 492                    (pprint-pop)
 493                    (let ((slot (pop remaining-slots)))
 494                      (write-char #\: stream)
 495                      (output-symbol-name (symbol-name (dsd-name slot)) stream)
 496                      (write-char #\space stream)
 497                      (pprint-newline :miser stream)
 498                      (output-object (funcall (fdefinition (dsd-accessor-name slot))
 499                                              structure)
 500                                     stream)
 501                      (when (null remaining-slots)
 502                        (return))
 503                      (write-char #\space stream)
 504                      (pprint-newline :linear stream))))))))))
 505
 506 (defun %default-structure-ugly-print (structure stream)
 507   (let* ((layout (%instance-layout structure))
 508          (name (classoid-name (layout-classoid layout)))
 509          (dd (layout-info layout)))
 510     (cond ((not dd)
 511            (%print-structure-sans-layout-info name stream))
 512           ((not (dd-slots dd))
 513            (%print-structure-sans-slots name stream))
 514           (t
 515            (descend-into (stream)
 516              (write-string "#S(" stream)
 517              (prin1 name stream)
 518              (do ((index 0 (1+ index))
 519                   (remaining-slots (dd-slots dd) (cdr remaining-slots)))
 520                  ((or (null remaining-slots)
 521                       (and (not *print-readably*)
 522                            *print-length*
 523                            (>= index *print-length*)))
 524                   (if (null remaining-slots)
 525                       (write-string ")" stream)
 526                       (write-string " ...)" stream)))
 527                (declare (type index index))
 528                (write-string " :" stream)
 529                (let ((slot (first remaining-slots)))
 530                  (output-symbol-name (symbol-name (dsd-name slot)) stream)
 531                  (write-char #\space stream)
 532                  (output-object
 533                   (funcall (fdefinition (dsd-accessor-name slot))
 534                            structure)
 535                   stream))))))))
 536
 537 (defun default-structure-print (structure stream depth)
 538   (declare (ignore depth))
 539   (cond ((funcallable-instance-p structure)
 540          (print-unreadable-object (structure stream :identity t :type t)))
 541         (*print-pretty*
 542          (%default-structure-pretty-print structure stream))
 543         (t
 544          (%default-structure-ugly-print structure stream))))
 545
 546 (def!method print-object ((x structure-object) stream)
 547   (default-structure-print x stream *current-level-in-print*))
 548 \f
 549 ;;;; testing structure types
 550
 551 ;;; Return true if OBJ is an object of the structure type
 552 ;;; corresponding to LAYOUT. This is called by the accessor closures,
 553 ;;; which have a handle on the type's LAYOUT.
 554 ;;;
 555 ;;; FIXME: This is fairly big, so it should probably become
 556 ;;; MAYBE-INLINE instead of INLINE, or its inlineness should become
 557 ;;; conditional (probably through DEFTRANSFORM) on (> SPEED SPACE). Or
 558 ;;; else we could fix things up so that the things which call it are
 559 ;;; all closures, so that it's expanded only in a small number of
 560 ;;; places.
 561 #!-sb-fluid (declaim (inline typep-to-layout))
 562 (defun typep-to-layout (obj layout)
 563   (declare (type layout layout) (optimize (speed 3) (safety 0)))
 564   (/noshow0 "entering TYPEP-TO-LAYOUT, OBJ,LAYOUT=..")
 565   (/nohexstr obj)
 566   (/nohexstr layout)
 567   (when (layout-invalid layout)
 568     (error "An obsolete structure accessor function was called."))
 569   (/noshow0 "back from testing LAYOUT-INVALID LAYOUT")
 570   (and (%instancep obj)
 571        (let ((obj-layout (%instance-layout obj)))
 572          (cond ((eq obj-layout layout)
 573                 ;; (In this case OBJ-LAYOUT can't be invalid, because
 574                 ;; we determined LAYOUT is valid in the test above.)
 575                 (/noshow0 "EQ case")
 576                 t)
 577                ((layout-invalid obj-layout)
 578                 (/noshow0 "LAYOUT-INVALID case")
 579                 (error 'layout-invalid
 580                        :expected-type (layout-classoid obj-layout)
 581                        :datum obj))
 582                (t
 583                 (let ((depthoid (layout-depthoid layout)))
 584                   (/noshow0 "DEPTHOID case, DEPTHOID,LAYOUT-INHERITS=..")
 585                   (/nohexstr depthoid)
 586                   (/nohexstr layout-inherits)
 587                   (and (> (layout-depthoid obj-layout) depthoid)
 588                        (eq (svref (layout-inherits obj-layout) depthoid)
 589                            layout))))))))
 590 \f
 591 ;;;; checking structure types
 592
 593 ;;; Check that X is an instance of the named structure type.
 594 (defmacro %check-structure-type-from-name (x name)
 595   `(%check-structure-type-from-layout ,x ,(compiler-layout-or-lose name)))
 596
 597 ;;; Check that X is a structure of the type described by DD.
 598 (defmacro %check-structure-type-from-dd (x dd)
 599   (declare (type defstruct-description dd))
 600   (let ((class-name (dd-name dd)))
 601     (ecase (dd-type dd)
 602       ((structure funcallable-instance)
 603        `(%check-structure-type-from-layout
 604          ,x
 605          ,(compiler-layout-or-lose class-name)))
 606       ((vector)
 607        (with-unique-names (xx)
 608          `(let ((,xx ,x))
 609             (declare (type vector ,xx))
 610             ,@(when (dd-named dd)
 611                 `((unless (eql (aref ,xx 0) ',class-name)
 612                     (error
 613                      'simple-type-error
 614                      :datum (aref ,xx 0)
 615                      :expected-type `(member ,class-name)
 616                      :format-control
 617                      "~@<missing name in instance of ~
 618                       VECTOR-typed structure ~S: ~2I~_S~:>"
 619                      :format-arguments (list ',class-name ,xx)))))
 620             (values))))
 621       ((list)
 622        (with-unique-names (xx)
 623          `(let ((,xx ,x))
 624             (declare (type list ,xx))
 625             ,@(when (dd-named dd)
 626                 `((unless (eql (first ,xx) ',class-name)
 627                     (error
 628                      'simple-type-error
 629                      :datum (aref ,xx 0)
 630                      :expected-type `(member ,class-name)
 631                      :format-control
 632                      "~@<missing name in instance of LIST-typed structure ~S: ~
 633                       ~2I~_S~:>"
 634                      :format-arguments (list ',class-name ,xx)))))
 635             (values)))))))
 636
 637 ;;; Check that X is an instance of the structure class with layout LAYOUT.
 638 (defun %check-structure-type-from-layout (x layout)
 639   (unless (typep-to-layout x layout)
 640     (error 'type-error
 641            :datum x
 642            :expected-type (classoid-name (layout-classoid layout))))
 643   (values))
 644
 645 \f
 646 (/show0 "target-defstruct.lisp end of file")