src/pcl/slots-boot.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 software originally released by Xerox
   5 ;;;; Corporation. Copyright and release statements follow. Later modifications
   6 ;;;; to the software are in the public domain and are provided with
   7 ;;;; absolutely no warranty. See the COPYING and CREDITS files for more
   8 ;;;; information.
   9
  10 ;;;; copyright information from original PCL sources:
  11 ;;;;
  12 ;;;; Copyright (c) 1985, 1986, 1987, 1988, 1989, 1990 Xerox Corporation.
  13 ;;;; All rights reserved.
  14 ;;;;
  15 ;;;; Use and copying of this software and preparation of derivative works based
  16 ;;;; upon this software are permitted. Any distribution of this software or
  17 ;;;; derivative works must comply with all applicable United States export
  18 ;;;; control laws.
  19 ;;;;
  20 ;;;; This software is made available AS IS, and Xerox Corporation makes no
  21 ;;;; warranty about the software, its performance or its conformity to any
  22 ;;;; specification.
  23
  24 (in-package "SB-PCL")
  25 \f
  26 (defun ensure-accessor (type fun-name slot-name)
  27   (labels ((slot-missing-fun (slot-name type)
  28              (let* ((method-type (ecase type
  29                                    (slot-value 'reader-method)
  30                                    (setf 'writer-method)
  31                                    (slot-boundp 'boundp-method)))
  32                     (initargs
  33                      (copy-tree
  34                       (ecase type
  35                         (slot-value
  36                          (make-method-function
  37                           (lambda (obj)
  38                             (values
  39                              (slot-missing (class-of obj) obj slot-name
  40                                            'slot-value)))))
  41                         (slot-boundp
  42                          (make-method-function
  43                           (lambda (obj)
  44                             (not (not
  45                                   (slot-missing (class-of obj) obj slot-name
  46                                                 'slot-boundp))))))
  47                         (setf
  48                          (make-method-function
  49                           (lambda (val obj)
  50                             (slot-missing (class-of obj) obj slot-name
  51                                           'setf val)
  52                             val)))))))
  53                (setf (getf (getf initargs :plist) :slot-name-lists)
  54                      (list (list nil slot-name)))
  55                (setf (getf (getf initargs :plist) :pv-table-symbol)
  56                      (gensym))
  57                (list* :method-spec (list method-type 'slot-object slot-name)
  58                       initargs)))
  59            (add-slot-missing-method (gf slot-name type)
  60              (multiple-value-bind (class lambda-list specializers)
  61                  (ecase type
  62                    (slot-value
  63                     (values 'standard-reader-method
  64                             '(object)
  65                             (list *the-class-slot-object*)))
  66                    (slot-boundp
  67                     (values 'standard-boundp-method
  68                             '(object)
  69                             (list *the-class-slot-object*)))
  70                    (setf
  71                     (values 'standard-writer-method
  72                             '(new-value object)
  73                             (list *the-class-t* *the-class-slot-object*))))
  74                (add-method gf (make-a-method class
  75                                              ()
  76                                              lambda-list
  77                                              specializers
  78                                              (slot-missing-fun slot-name type)
  79                                              "generated slot-missing method"
  80                                              slot-name)))))
  81         (unless (fboundp fun-name)
  82       (let ((gf (ensure-generic-function fun-name)))
  83         (ecase type
  84           (reader (add-slot-missing-method gf slot-name 'slot-value))
  85           (boundp (add-slot-missing-method gf slot-name 'slot-boundp))
  86           (writer (add-slot-missing-method gf slot-name 'setf)))
  87         (setf (plist-value gf 'slot-missing-method) t))
  88       t)))
  89
  90 (defmacro accessor-slot-value (object slot-name)
  91   (aver (constantp slot-name))
  92   (let* ((slot-name (eval slot-name))
  93          (reader-name (slot-reader-name slot-name)))
  94     `(let ((.ignore. (load-time-value
  95                       (ensure-accessor 'reader ',reader-name ',slot-name))))
  96       (declare (ignore .ignore.))
  97       (funcall #',reader-name ,object))))
  98
  99 (defmacro accessor-set-slot-value (object slot-name new-value &environment env)
 100   (aver (constantp slot-name))
 101   (setq object (macroexpand object env))
 102   (setq slot-name (macroexpand slot-name env))
 103   (let* ((slot-name (eval slot-name))
 104          (bindings (unless (or (constantp new-value) (atom new-value))
 105                      (let ((object-var (gensym)))
 106                        (prog1 `((,object-var ,object))
 107                          (setq object object-var)))))
 108          (writer-name (slot-writer-name slot-name))
 109          (form
 110           `(let ((.ignore.
 111                   (load-time-value
 112                    (ensure-accessor 'writer ',writer-name ',slot-name)))
 113                  (.new-value. ,new-value))
 114             (declare (ignore .ignore.))
 115             (funcall #',writer-name .new-value. ,object)
 116             .new-value.)))
 117     (if bindings
 118         `(let ,bindings ,form)
 119         form)))
 120
 121 (defmacro accessor-slot-boundp (object slot-name)
 122   (aver (constantp slot-name))
 123   (let* ((slot-name (eval slot-name))
 124          (boundp-name (slot-boundp-name slot-name)))
 125     `(let ((.ignore. (load-time-value
 126                       (ensure-accessor 'boundp ',boundp-name ',slot-name))))
 127       (declare (ignore .ignore.))
 128       (funcall #',boundp-name ,object))))
 129
 130 (defun make-structure-slot-boundp-function (slotd)
 131   (declare (ignore slotd))
 132   (lambda (object)
 133     (declare (ignore object))
 134     t))
 135
 136 (defun get-optimized-std-accessor-method-function (class slotd name)
 137   (cond
 138     ((structure-class-p class)
 139      (ecase name
 140        (reader (slot-definition-internal-reader-function slotd))
 141        (writer (slot-definition-internal-writer-function slotd))
 142        (boundp (make-structure-slot-boundp-function slotd))))
 143     ((condition-class-p class)
 144      (ecase name
 145        (reader (slot-definition-reader-function slotd))
 146        (writer (slot-definition-writer-function slotd))
 147        (boundp (slot-definition-boundp-function slotd))))
 148     (t
 149      (let* ((fsc-p (cond ((standard-class-p class) nil)
 150                          ((funcallable-standard-class-p class) t)
 151                          ((std-class-p class)
 152                           ;; Shouldn't be using the optimized-std-accessors
 153                           ;; in this case.
 154                           #+nil (format t "* warning: ~S ~S~%   ~S~%"
 155                                         name slotd class)
 156                           nil)
 157                          (t (error "~S is not a STANDARD-CLASS." class))))
 158             (slot-name (slot-definition-name slotd))
 159             (index (slot-definition-location slotd))
 160             (function (ecase name
 161                         (reader #'make-optimized-std-reader-method-function)
 162                         (writer #'make-optimized-std-writer-method-function)
 163                         (boundp #'make-optimized-std-boundp-method-function)))
 164             (value (funcall function fsc-p slot-name index)))
 165        (declare (type function function))
 166        (values value index)))))
 167
 168 (defun make-optimized-std-reader-method-function (fsc-p slot-name index)
 169   (declare #.*optimize-speed*)
 170   (set-fun-name
 171    (etypecase index
 172      (fixnum
 173       (if fsc-p
 174           (lambda (instance)
 175             (check-obsolete-instance instance)
 176             (let ((value (clos-slots-ref (fsc-instance-slots instance) index)))
 177               (if (eq value +slot-unbound+)
 178                   (values
 179                    (slot-unbound (class-of instance) instance slot-name))
 180                   value)))
 181           (lambda (instance)
 182             (check-obsolete-instance instance)
 183             (let ((value (clos-slots-ref (std-instance-slots instance) index)))
 184               (if (eq value +slot-unbound+)
 185                   (values
 186                    (slot-unbound (class-of instance) instance slot-name))
 187                   value)))))
 188      (cons
 189       (lambda (instance)
 190         (check-obsolete-instance instance)
 191         (let ((value (cdr index)))
 192           (if (eq value +slot-unbound+)
 193               (values (slot-unbound (class-of instance) instance slot-name))
 194               value)))))
 195    `(reader ,slot-name)))
 196
 197 (defun make-optimized-std-writer-method-function (fsc-p slot-name index)
 198   (declare #.*optimize-speed*)
 199   (set-fun-name
 200    (etypecase index
 201      (fixnum (if fsc-p
 202                  (lambda (nv instance)
 203                    (check-obsolete-instance instance)
 204                    (setf (clos-slots-ref (fsc-instance-slots instance) index)
 205                          nv))
 206                  (lambda (nv instance)
 207                    (check-obsolete-instance instance)
 208                    (setf (clos-slots-ref (std-instance-slots instance) index)
 209                          nv))))
 210      (cons   (lambda (nv instance)
 211                (check-obsolete-instance instance)
 212                (setf (cdr index) nv))))
 213    `(writer ,slot-name)))
 214
 215 (defun make-optimized-std-boundp-method-function (fsc-p slot-name index)
 216   (declare #.*optimize-speed*)
 217   (set-fun-name
 218    (etypecase index
 219      (fixnum (if fsc-p
 220                  (lambda (instance)
 221                    (check-obsolete-instance instance)
 222                    (not (eq (clos-slots-ref (fsc-instance-slots instance)
 223                                             index)
 224                             +slot-unbound+)))
 225                  (lambda (instance)
 226                    (check-obsolete-instance instance)
 227                    (not (eq (clos-slots-ref (std-instance-slots instance)
 228                                             index)
 229                             +slot-unbound+)))))
 230      (cons (lambda (instance)
 231              (check-obsolete-instance instance)
 232              (not (eq (cdr index) +slot-unbound+)))))
 233    `(boundp ,slot-name)))
 234
 235 (defun make-optimized-structure-slot-value-using-class-method-function (function)
 236   (declare (type function function))
 237   (lambda (class object slotd)
 238     (declare (ignore class slotd))
 239     (funcall function object)))
 240
 241 (defun make-optimized-structure-setf-slot-value-using-class-method-function (function)
 242   (declare (type function function))
 243   (lambda (nv class object slotd)
 244     (declare (ignore class slotd))
 245     (funcall function nv object)))
 246
 247 (defun make-optimized-structure-slot-boundp-using-class-method-function ()
 248   (lambda (class object slotd)
 249     (declare (ignore class object slotd))
 250     t))
 251
 252 (defun get-optimized-std-slot-value-using-class-method-function
 253     (class slotd name)
 254   (cond
 255     ((structure-class-p class)
 256      (ecase name
 257        (reader (make-optimized-structure-slot-value-using-class-method-function
 258                 (slot-definition-internal-reader-function slotd)))
 259        (writer (make-optimized-structure-setf-slot-value-using-class-method-function
 260                 (slot-definition-internal-writer-function slotd)))
 261        (boundp (make-optimized-structure-slot-boundp-using-class-method-function))))
 262     ((condition-class-p class)
 263      (ecase name
 264        (reader
 265         (let ((fun (slot-definition-reader-function slotd)))
 266           (declare (type function fun))
 267           (lambda (class object slotd)
 268             (declare (ignore class slotd))
 269             (funcall fun object))))
 270        (writer
 271         (let ((fun (slot-definition-writer-function slotd)))
 272           (declare (type function fun))
 273           (lambda (new-value class object slotd)
 274             (declare (ignore class slotd))
 275             (funcall fun new-value object))))
 276        (boundp
 277         (let ((fun (slot-definition-boundp-function slotd)))
 278           (declare (type function fun))
 279           (lambda (class object slotd)
 280             (declare (ignore class slotd))
 281             (funcall fun object))))))
 282     (t
 283      (let* ((fsc-p (cond ((standard-class-p class) nil)
 284                          ((funcallable-standard-class-p class) t)
 285                          (t (error "~S is not a standard-class" class))))
 286             (slot-name (slot-definition-name slotd))
 287             (index (slot-definition-location slotd))
 288             (function
 289              (ecase name
 290                (reader
 291                 #'make-optimized-std-slot-value-using-class-method-function)
 292                (writer
 293                 #'make-optimized-std-setf-slot-value-using-class-method-function)
 294                (boundp
 295                 #'make-optimized-std-slot-boundp-using-class-method-function))))
 296        (declare (type function function))
 297        (values (funcall function fsc-p slot-name index) index)))))
 298
 299 (defun make-optimized-std-slot-value-using-class-method-function
 300     (fsc-p slot-name index)
 301   (declare #.*optimize-speed*)
 302   (etypecase index
 303     (fixnum (if fsc-p
 304                 (lambda (class instance slotd)
 305                   (declare (ignore slotd))
 306                   (check-obsolete-instance instance)
 307                   (let ((value (clos-slots-ref (fsc-instance-slots instance)
 308                                                index)))
 309                     (if (eq value +slot-unbound+)
 310                         (values (slot-unbound class instance slot-name))
 311                         value)))
 312                 (lambda (class instance slotd)
 313                   (declare (ignore slotd))
 314                   (check-obsolete-instance instance)
 315                   (let ((value (clos-slots-ref (std-instance-slots instance)
 316                                                index)))
 317                     (if (eq value +slot-unbound+)
 318                         (values (slot-unbound class instance slot-name))
 319                         value)))))
 320     (cons   (lambda (class instance slotd)
 321               (declare (ignore slotd))
 322               (check-obsolete-instance instance)
 323               (let ((value (cdr index)))
 324                 (if (eq value +slot-unbound+)
 325                     (values (slot-unbound class instance slot-name))
 326                     value))))))
 327
 328 (defun make-optimized-std-setf-slot-value-using-class-method-function
 329     (fsc-p slot-name index)
 330   (declare #.*optimize-speed*)
 331   (declare (ignore slot-name))
 332   (etypecase index
 333     (fixnum (if fsc-p
 334                 (lambda (nv class instance slotd)
 335                   (declare (ignore class slotd))
 336                   (check-obsolete-instance instance)
 337                   (setf (clos-slots-ref (fsc-instance-slots instance) index)
 338                         nv))
 339                 (lambda (nv class instance slotd)
 340                   (declare (ignore class slotd))
 341                   (check-obsolete-instance instance)
 342                   (setf (clos-slots-ref (std-instance-slots instance) index)
 343                         nv))))
 344     (cons  (lambda (nv class instance slotd)
 345              (declare (ignore class slotd))
 346              (check-obsolete-instance instance)
 347              (setf (cdr index) nv)))))
 348
 349 (defun make-optimized-std-slot-boundp-using-class-method-function
 350     (fsc-p slot-name index)
 351   (declare #.*optimize-speed*)
 352   (declare (ignore slot-name))
 353   (etypecase index
 354     (fixnum (if fsc-p
 355                 (lambda (class instance slotd)
 356                   (declare (ignore class slotd))
 357                   (check-obsolete-instance instance)
 358                   (not (eq (clos-slots-ref (fsc-instance-slots instance) index)
 359                            +slot-unbound+)))
 360                 (lambda (class instance slotd)
 361                   (declare (ignore class slotd))
 362                   (check-obsolete-instance instance)
 363                   (not (eq (clos-slots-ref (std-instance-slots instance) index)
 364                            +slot-unbound+)))))
 365     (cons   (lambda (class instance slotd)
 366               (declare (ignore class slotd))
 367               (check-obsolete-instance instance)
 368               (not (eq (cdr index) +slot-unbound+))))))
 369
 370 (defun get-accessor-from-svuc-method-function (class slotd sdfun name)
 371   (macrolet ((emf-funcall (emf &rest args)
 372                `(invoke-effective-method-function ,emf nil ,@args)))
 373     (set-fun-name
 374      (case name
 375        (reader (lambda (instance)
 376                  (emf-funcall sdfun class instance slotd)))
 377        (writer (lambda (nv instance)
 378                  (emf-funcall sdfun nv class instance slotd)))
 379        (boundp (lambda (instance)
 380                  (emf-funcall sdfun class instance slotd))))
 381      `(,name ,(class-name class) ,(slot-definition-name slotd)))))
 382
 383 (defun make-internal-reader-method-function (class-name slot-name)
 384   (list* :method-spec `(internal-reader-method ,class-name ,slot-name)
 385          (make-method-function
 386           (lambda (instance)
 387             (let ((wrapper (get-instance-wrapper-or-nil instance)))
 388               (if wrapper
 389                   (let* ((class (wrapper-class* wrapper))
 390                          (index (or (instance-slot-index wrapper slot-name)
 391                                     (assq slot-name
 392                                           (wrapper-class-slots wrapper)))))
 393                     (typecase index
 394                       (fixnum
 395                        (let ((value (clos-slots-ref (get-slots instance)
 396                                                     index)))
 397                          (if (eq value +slot-unbound+)
 398                              (values (slot-unbound (class-of instance)
 399                                                    instance
 400                                                    slot-name))
 401                              value)))
 402                       (cons
 403                        (let ((value (cdr index)))
 404                          (if (eq value +slot-unbound+)
 405                              (values (slot-unbound (class-of instance)
 406                                                    instance
 407                                                    slot-name))
 408                              value)))
 409                       (t
 410                        (error "~@<The wrapper for class ~S does not have ~
 411                                the slot ~S~@:>"
 412                               class slot-name))))
 413                   (slot-value instance slot-name)))))))
 414 \f
 415 (defun make-std-reader-method-function (class-name slot-name)
 416   (let* ((pv-table-symbol (gensym))
 417          (initargs (copy-tree
 418                     (make-method-function
 419                      (lambda (instance)
 420                        (pv-binding1 (.pv. .calls.
 421                                           (symbol-value pv-table-symbol)
 422                                           (instance) (instance-slots))
 423                          (instance-read-internal
 424                           .pv. instance-slots 1
 425                           (slot-value instance slot-name))))))))
 426     (setf (getf (getf initargs :plist) :slot-name-lists)
 427           (list (list nil slot-name)))
 428     (setf (getf (getf initargs :plist) :pv-table-symbol) pv-table-symbol)
 429     (list* :method-spec `(reader-method ,class-name ,slot-name)
 430            initargs)))
 431
 432 (defun make-std-writer-method-function (class-name slot-name)
 433   (let* ((pv-table-symbol (gensym))
 434          (initargs (copy-tree
 435                     (make-method-function
 436                      (lambda (nv instance)
 437                        (pv-binding1 (.pv. .calls.
 438                                           (symbol-value pv-table-symbol)
 439                                           (instance) (instance-slots))
 440                          (instance-write-internal
 441                           .pv. instance-slots 1 nv
 442                           (setf (slot-value instance slot-name) nv))))))))
 443     (setf (getf (getf initargs :plist) :slot-name-lists)
 444           (list nil (list nil slot-name)))
 445     (setf (getf (getf initargs :plist) :pv-table-symbol) pv-table-symbol)
 446     (list* :method-spec `(writer-method ,class-name ,slot-name)
 447            initargs)))
 448
 449 (defun make-std-boundp-method-function (class-name slot-name)
 450   (let* ((pv-table-symbol (gensym))
 451          (initargs (copy-tree
 452                     (make-method-function
 453                      (lambda (instance)
 454                        (pv-binding1 (.pv. .calls.
 455                                           (symbol-value pv-table-symbol)
 456                                           (instance) (instance-slots))
 457                           (instance-boundp-internal
 458                            .pv. instance-slots 1
 459                            (slot-boundp instance slot-name))))))))
 460     (setf (getf (getf initargs :plist) :slot-name-lists)
 461           (list (list nil slot-name)))
 462     (setf (getf (getf initargs :plist) :pv-table-symbol) pv-table-symbol)
 463     (list* :method-spec `(boundp-method ,class-name ,slot-name)
 464            initargs)))
 465
 466 (defun initialize-internal-slot-gfs (slot-name &optional type)
 467   (macrolet ((frob (type name-fun add-fun)
 468                `(when (or (null type) (eq type ',type))
 469                  (let* ((name (,name-fun slot-name))
 470                         (gf (ensure-generic-function name))
 471                         (methods (generic-function-methods gf)))
 472                    (when (or (null methods)
 473                              (plist-value gf 'slot-missing-method))
 474                      (setf (plist-value gf 'slot-missing-method) nil)
 475                      (,add-fun *the-class-slot-object* gf slot-name))))))
 476     (frob reader slot-reader-name add-reader-method)
 477     (frob writer slot-writer-name add-writer-method)
 478     (frob boundp slot-boundp-name add-boundp-method)))