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