mdw@git.distorted.org.uk Git - sod/blob - src/class-output.lisp

   1 ;;; -*-lisp-*-
   2 ;;;
   3 ;;; Output for classes
   4 ;;;
   5 ;;; (c) 2009 Straylight/Edgeware
   6 ;;;
   7
   8 ;;;----- Licensing notice ---------------------------------------------------
   9 ;;;
  10 ;;; This file is part of the Sensible Object Design, an object system for C.
  11 ;;;
  12 ;;; SOD is free software; you can redistribute it and/or modify
  13 ;;; it under the terms of the GNU General Public License as published by
  14 ;;; the Free Software Foundation; either version 2 of the License, or
  15 ;;; (at your option) any later version.
  16 ;;;
  17 ;;; SOD is distributed in the hope that it will be useful,
  18 ;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 ;;; GNU General Public License for more details.
  21 ;;;
  22 ;;; You should have received a copy of the GNU General Public License
  23 ;;; along with SOD; if not, write to the Free Software Foundation,
  24 ;;; Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  25
  26 (cl:in-package #:sod)
  27
  28 ;;;--------------------------------------------------------------------------
  29 ;;; Walking the layout tree.
  30
  31 (defmethod hook-output progn ((class sod-class) reason sequencer)
  32   (with-slots ((ilayout %ilayout) vtables methods effective-methods) class
  33     (hook-output ilayout reason sequencer)
  34     (dolist (method methods) (hook-output method reason sequencer))
  35     (dolist (method effective-methods) (hook-output method reason sequencer))
  36     (dolist (vtable vtables) (hook-output vtable reason sequencer))))
  37
  38 (defmethod hook-output progn ((ilayout ilayout) reason sequencer)
  39   (with-slots (ichains) ilayout
  40     (dolist (ichain ichains) (hook-output ichain reason sequencer))))
  41
  42 (defmethod hook-output progn ((ichain ichain) reason sequencer)
  43   (dolist (item (ichain-body ichain)) (hook-output item reason sequencer)))
  44
  45 (defmethod hook-output progn ((islots islots) reason sequencer)
  46   (dolist (slot (islots-slots islots)) (hook-output slot reason sequencer)))
  47
  48 (defmethod hook-output progn ((vtable vtable) reason sequencer)
  49   (with-slots (body) vtable
  50     (dolist (item body) (hook-output item reason sequencer))))
  51
  52 (defmethod hook-output progn ((vtmsgs vtmsgs) reason sequencer)
  53   (with-slots (entries) vtmsgs
  54     (dolist (entry entries) (hook-output entry reason sequencer))))
  55
  56 ;;;--------------------------------------------------------------------------
  57 ;;; Classes.
  58
  59 (defmethod hook-output progn ((class sod-class) (reason (eql :h)) sequencer)
  60
  61   ;; Main output sequencing.
  62   (sequence-output (stream sequencer)
  63
  64     :constraint
  65     ((:classes :start)
  66      (class :banner)
  67      (class :islots :start) (class :islots :slots) (class :islots :end)
  68      (class :vtmsgs :start) (class :vtmsgs :end)
  69      (class :vtables :start) (class :vtables :end)
  70      (class :vtable-externs) (class :vtable-externs-after)
  71      (class :methods :start) (class :methods) (class :methods :end)
  72      (class :ichains :start) (class :ichains :end)
  73      (class :ilayout :start) (class :ilayout :slots) (class :ilayout :end)
  74      (class :conversions)
  75      (class :message-macros)
  76      (class :object)
  77      (:classes :end))
  78
  79     (:typedefs
  80      (format stream "typedef struct ~A ~A;~%"
  81              (ichain-struct-tag class (sod-class-chain-head class)) class))
  82
  83     ((class :banner)
  84      (banner (format nil "Class ~A" class) stream))
  85     ((class :vtable-externs-after)
  86      (terpri stream))
  87
  88     ((class :vtable-externs)
  89      (format stream "/* Vtable structures. */~%"))
  90
  91     ((class :object)
  92      (let ((metaclass (sod-class-metaclass class))
  93            (metaroot (find-root-metaclass class)))
  94        (format stream "/* The class object. */~@
  95                        extern const struct ~A ~A__classobj;~@
  96                        #define ~:*~A__class (&~:*~A__classobj.~A.~A)~2%"
  97                (ilayout-struct-tag metaclass) class
  98                (sod-class-nickname (sod-class-chain-head metaroot))
  99                (sod-class-nickname metaroot)))))
 100
 101   ;; Maybe generate an islots structure.
 102   (when (sod-class-slots class)
 103     (dolist (slot (sod-class-slots class))
 104       (hook-output slot 'islots sequencer))
 105     (sequence-output (stream sequencer)
 106       ((class :islots :start)
 107        (format stream "/* Instance slots. */~@
 108                        struct ~A {~%"
 109                (islots-struct-tag class)))
 110       ((class :islots :end)
 111        (format stream "};~2%"))))
 112
 113   ;; Declare the direct methods.
 114   (when (sod-class-methods class)
 115     (sequence-output (stream sequencer)
 116       ((class :methods :start)
 117        (format stream "/* Direct methods. */~%"))
 118       ((class :methods :end)
 119        (terpri stream))))
 120
 121   ;; Provide upcast macros which do the right thing.
 122   (when (sod-class-direct-superclasses class)
 123     (sequence-output (stream sequencer)
 124       ((class :conversions)
 125        (let ((chain-head (sod-class-chain-head class)))
 126          (format stream "/* Conversion macros. */~%")
 127          (dolist (super (cdr (sod-class-precedence-list class)))
 128            (let ((super-head (sod-class-chain-head super)))
 129              (format stream "#define ~:@(~A__CONV_~A~)(_obj) ((~A *)~
 130                                      ~:[SOD_XCHAIN(~A, (_obj))~;(_obj)~])~%"
 131                      class (sod-class-nickname super) super
 132                      (eq chain-head super-head)
 133                      (sod-class-nickname super-head))))
 134          (terpri stream)))))
 135
 136   ;; Provide convenience macros for sending the newly defined messages.  (The
 137   ;; macros work on all subclasses too.)
 138   ;;
 139   ;; We need each message's method entry type for this, so we need to dig it
 140   ;; out of the vtmsgs structure.  Indeed, the vtmsgs for this class contains
 141   ;; entries for precisely the messages we want to make macros for.
 142   (when (sod-class-messages class)
 143     (sequence-output (stream sequencer)
 144       ((class :message-macros)
 145        (let* ((vtable (find (sod-class-chain-head class)
 146                             (sod-class-vtables class)
 147                             :key #'vtable-chain-head))
 148               (vtmsgs (find-if (lambda (item)
 149                                  (and (typep item 'vtmsgs)
 150                                       (eql (vtmsgs-class item) class)))
 151                                (vtable-body vtable))))
 152          (format stream "/* Message invocation macros. */~%")
 153          (dolist (entry (vtmsgs-entries vtmsgs))
 154            (let* ((type (method-entry-function-type entry))
 155                   (args (c-function-arguments type))
 156                   (in-names nil) (out-names nil) (varargsp nil) (me "me"))
 157              (do ((args args (cdr args)))
 158                  ((endp args))
 159                (let* ((raw-name (princ-to-string (argument-name (car args))))
 160                       (name (if (find raw-name
 161                                       (list "_vt"
 162                                             (sod-class-nickname class)
 163                                             (method-entry-slot-name entry))
 164                                       :test #'string=)
 165                                 (format nil "sod__a_~A" raw-name)
 166                                 raw-name)))
 167                  (cond ((and (cdr args) (eq (cadr args) :ellipsis))
 168                         (setf varargsp t)
 169                         (unless in-names (setf me "SOD__CAR(__VA_ARGS__)"))
 170                         (push (format nil "/*~A*/ ..." name) in-names)
 171                         (push "__VA_ARGS__" out-names)
 172                         (return))
 173                        (t
 174                         (push name in-names)
 175                         (push name out-names)))))
 176              (when varargsp
 177                (format stream "#if __STDC_VERSION__ >= 199901~%"))
 178              (format stream "#define ~A(~{~A~^, ~}) ~
 179                                    ~A->_vt->~A.~A(~{~A~^, ~})~%"
 180                      (message-macro-name class entry)
 181                      (nreverse in-names)
 182                      me
 183                      (sod-class-nickname class)
 184                      (method-entry-slot-name entry)
 185                      (nreverse out-names))
 186              (when varargsp
 187                (format stream "#endif~%"))))
 188          (terpri stream)))))
 189
 190   ;; Generate vtmsgs structure for all superclasses.
 191   (hook-output (car (sod-class-vtables class)) 'vtmsgs sequencer))
 192
 193 ;;;--------------------------------------------------------------------------
 194 ;;; Instance structure.
 195
 196 (defmethod hook-output progn
 197     ((slot sod-slot) (reason (eql 'islots)) sequencer)
 198   (sequence-output (stream sequencer)
 199     (((sod-slot-class slot) :islots :slots)
 200      (pprint-logical-block (stream nil :prefix "  " :suffix ";")
 201        (pprint-c-type (sod-slot-type slot) stream (sod-slot-name slot)))
 202      (terpri stream))))
 203
 204 (defmethod hook-output progn ((ilayout ilayout) (reason (eql :h)) sequencer)
 205   (with-slots ((class %class) ichains) ilayout
 206     (sequence-output (stream sequencer)
 207       ((class :ilayout :start)
 208        (format stream "/* Instance layout. */~@
 209                        struct ~A {~%"
 210                (ilayout-struct-tag class)))
 211       ((class :ilayout :end)
 212        (format stream "};~2%")))
 213     (dolist (ichain ichains)
 214       (hook-output ichain 'ilayout sequencer))))
 215
 216 (defmethod hook-output progn ((ichain ichain) (reason (eql :h)) sequencer)
 217   (with-slots ((class %class) chain-head chain-tail) ichain
 218     (when (eq class chain-tail)
 219       (sequence-output (stream sequencer)
 220         :constraint ((class :ichains :start)
 221                      (class :ichain chain-head :start)
 222                      (class :ichain chain-head :slots)
 223                      (class :ichain chain-head :end)
 224                      (class :ichains :end))
 225         ((class :ichain chain-head :start)
 226          (format stream "/* Instance chain structure. */~@
 227                          struct ~A {~%"
 228                  (ichain-struct-tag chain-tail chain-head)))
 229         ((class :ichain chain-head :end)
 230          (format stream "};~2%")
 231          (format stream "/* Union of equivalent superclass chains. */~@
 232                          union ~A {~@
 233                          ~:{  struct ~A ~A;~%~}~
 234                          };~2%"
 235                  (ichain-union-tag chain-tail chain-head)
 236
 237                  ;; Make sure the most specific class is first: only the
 238                  ;; first element of a union can be statically initialized in
 239                  ;; C90.
 240                  (mapcar (lambda (super)
 241                            (list (ichain-struct-tag super chain-head)
 242                                  (sod-class-nickname super)))
 243                          (sod-class-chain chain-tail))))))))
 244
 245 (defmethod hook-output progn
 246     ((ichain ichain) (reason (eql 'ilayout)) sequencer)
 247   (with-slots ((class %class) chain-head chain-tail) ichain
 248     (sequence-output (stream sequencer)
 249       ((class :ilayout :slots)
 250        (format stream "  union ~A ~A;~%"
 251                (ichain-union-tag chain-tail chain-head)
 252                (sod-class-nickname chain-head))))))
 253
 254 (defmethod hook-output progn ((vtptr vtable-pointer)
 255                               (reason (eql :h))
 256                               sequencer)
 257   (with-slots ((class %class) chain-head chain-tail) vtptr
 258     (sequence-output (stream sequencer)
 259       ((class :ichain chain-head :slots)
 260        (format stream "  const struct ~A *_vt;~%"
 261                (vtable-struct-tag chain-tail chain-head))))))
 262
 263 (defmethod hook-output progn ((islots islots) (reason (eql :h)) sequencer)
 264   (with-slots ((class %class) subclass slots) islots
 265     (sequence-output (stream sequencer)
 266       ((subclass :ichain (sod-class-chain-head class) :slots)
 267        (format stream "  struct ~A ~A;~%"
 268                (islots-struct-tag class)
 269                (sod-class-nickname class))))))
 270
 271 ;;;--------------------------------------------------------------------------
 272 ;;; Vtable structure.
 273
 274 (defmethod hook-output progn
 275     ((method sod-method) (reason (eql :h)) sequencer)
 276   (with-slots ((class %class)) method
 277     (sequence-output (stream sequencer)
 278       ((class :methods)
 279        (let ((type (sod-method-function-type method)))
 280          (princ "extern " stream)
 281          (pprint-c-type (commentify-function-type type) stream
 282                         (sod-method-function-name method))
 283          (format stream ";~%"))))))
 284
 285 (defmethod hook-output progn ((vtable vtable) (reason (eql :h)) sequencer)
 286   (with-slots ((class %class) chain-head chain-tail) vtable
 287     (when (eq class chain-tail)
 288       (sequence-output (stream sequencer)
 289         :constraint ((class :vtables :start)
 290                      (class :vtable chain-head :start)
 291                      (class :vtable chain-head :slots)
 292                      (class :vtable chain-head :end)
 293                      (class :vtables :end))
 294         ((class :vtable chain-head :start)
 295          (format stream "/* Vtable structure. */~@
 296                          struct ~A {~%"
 297                  (vtable-struct-tag chain-tail chain-head)))
 298         ((class :vtable chain-head :end)
 299          (format stream "};~2%")
 300          (format stream "/* Union of equivalent superclass vtables. */~@
 301                          union ~A {~@
 302                          ~:{  struct ~A ~A;~%~}~
 303                          };~2%"
 304                  (vtable-union-tag chain-tail chain-head)
 305
 306                  ;; As for the ichain union, make sure the most specific
 307                  ;; class is first.
 308                  (mapcar (lambda (super)
 309                            (list (vtable-struct-tag super chain-head)
 310                                  (sod-class-nickname super)))
 311                          (sod-class-chain chain-tail))))))
 312     (sequence-output (stream sequencer)
 313       ((class :vtable-externs)
 314        (format stream "~@<extern const union ~A ~2I~_~A;~:>~%"
 315                (vtable-union-tag chain-tail chain-head)
 316                (vtable-name class chain-head))))))
 317
 318 (defmethod hook-output progn ((vtmsgs vtmsgs) (reason (eql :h)) sequencer)
 319   (with-slots ((class %class) subclass chain-head chain-tail) vtmsgs
 320     (sequence-output (stream sequencer)
 321       ((subclass :vtable chain-head :slots)
 322        (format stream "  struct ~A ~A;~%"
 323                (vtmsgs-struct-tag subclass class)
 324                (sod-class-nickname class))))))
 325
 326 (defmethod hook-output progn
 327     ((vtmsgs vtmsgs) (reason (eql 'vtmsgs)) sequencer)
 328   (when (vtmsgs-entries vtmsgs)
 329     (with-slots ((class %class) subclass) vtmsgs
 330       (sequence-output (stream sequencer)
 331         :constraint ((subclass :vtmsgs :start)
 332                      (subclass :vtmsgs class :start)
 333                      (subclass :vtmsgs class :slots)
 334                      (subclass :vtmsgs class :end)
 335                      (subclass :vtmsgs :end))
 336         ((subclass :vtmsgs class :start)
 337          (format stream "/* Messages protocol from class ~A */~@
 338                          struct ~A {~%"
 339                  class
 340                  (vtmsgs-struct-tag subclass class)))
 341         ((subclass :vtmsgs class :end)
 342          (format stream "};~2%"))))))
 343
 344 (defmethod hook-output progn
 345     ((entry method-entry) (reason (eql 'vtmsgs)) sequencer)
 346   (let* ((method (method-entry-effective-method entry))
 347          (message (effective-method-message method))
 348          (class (effective-method-class method))
 349          (function-type (method-entry-function-type entry))
 350          (commented-type (commentify-function-type function-type))
 351          (pointer-type (make-pointer-type commented-type)))
 352     (sequence-output (stream sequencer)
 353       ((class :vtmsgs (sod-message-class message) :slots)
 354        (pprint-logical-block (stream nil :prefix "  " :suffix ";")
 355          (pprint-c-type pointer-type stream (method-entry-slot-name entry)))
 356        (terpri stream)))))
 357
 358 (defmethod hook-output progn
 359     ((cptr class-pointer) (reason (eql :h)) sequencer)
 360   (with-slots ((class %class) chain-head metaclass meta-chain-head) cptr
 361     (sequence-output (stream sequencer)
 362       ((class :vtable chain-head :slots)
 363        (format stream "  const ~A *~:[_class~;~:*_cls_~A~];~%"
 364                metaclass
 365                (and (sod-class-direct-superclasses meta-chain-head)
 366                     (sod-class-nickname meta-chain-head)))))))
 367
 368 (defmethod hook-output progn ((boff base-offset) (reason (eql :h)) sequencer)
 369   (with-slots ((class %class) chain-head) boff
 370     (sequence-output (stream sequencer)
 371       ((class :vtable chain-head :slots)
 372        (write-line "  size_t _base;" stream)))))
 373
 374 (defmethod hook-output progn
 375     ((choff chain-offset) (reason (eql :h)) sequencer)
 376   (with-slots ((class %class) chain-head target-head) choff
 377     (sequence-output (stream sequencer)
 378       ((class :vtable chain-head :slots)
 379        (format stream "  ptrdiff_t _off_~A;~%"
 380                (sod-class-nickname target-head))))))
 381
 382 ;;;--------------------------------------------------------------------------
 383 ;;; Implementation output.
 384
 385 (export '*instance-class*)
 386 (defvar *instance-class* nil
 387   "The class currently being output.
 388
 389    This is bound during the `hook-output' traversal of a class layout for
 390    `:c' output, since some of the objects traversed actually `belong' to
 391    superclasses and there's no other way to find out what the reference class
 392    actually is.
 393
 394    It may be bound at other times.")
 395
 396 (defmethod hook-output progn ((class sod-class) (reason (eql :c)) sequencer)
 397   (sequence-output (stream sequencer)
 398
 399     :constraint
 400     ((:classes :start)
 401      (class :banner)
 402      (class :direct-methods :start) (class :direct-methods :end)
 403      (class :effective-methods)
 404      (class :vtables :start) (class :vtables :end)
 405      (class :object :prepare) (class :object :start) (class :object :end)
 406      (:classes :end))
 407
 408     ((class :banner)
 409      (banner (format nil "Class ~A" class) stream))
 410
 411     ((class :object :start)
 412      (format stream "~
 413 /* The class object. */
 414 const struct ~A ~A__classobj = {~%"
 415              (ilayout-struct-tag (sod-class-metaclass class))
 416              class))
 417     ((class :object :end)
 418      (format stream "};~2%")))
 419
 420   (let ((*instance-class* class))
 421     (hook-output (sod-class-ilayout (sod-class-metaclass class))
 422                  'class sequencer)))
 423
 424 ;;;--------------------------------------------------------------------------
 425 ;;; Direct and effective methods.
 426
 427 (defmethod hook-output progn
 428     ((method delegating-direct-method) (reason (eql :c)) sequencer)
 429   (with-slots ((class %class) body) method
 430     (unless body
 431       (return-from hook-output))
 432     (sequence-output (stream sequencer)
 433       ((class :direct-method method :start)
 434        (format stream "#define CALL_NEXT_METHOD (next_method(~{~A~^, ~}))~%"
 435                (mapcar #'argument-name
 436                        (c-function-arguments (sod-method-next-method-type
 437                                               method)))))
 438       ((class :direct-method method :end)
 439        (format stream "#undef CALL_NEXT_METHOD~%")))))
 440
 441 (defmethod hook-output progn
 442     ((method sod-method) (reason (eql :c)) sequencer)
 443   (with-slots ((class %class) body) method
 444     (unless body
 445       (return-from hook-output))
 446     (sequence-output (stream sequencer)
 447       :constraint ((class :direct-methods :start)
 448                    (class :direct-method method :start)
 449                    (class :direct-method method :body)
 450                    (class :direct-method method :end)
 451                    (class :direct-methods :end))
 452       ((class :direct-method method :body)
 453        (pprint-c-type (sod-method-function-type method)
 454                       stream
 455                       (sod-method-function-name method))
 456        (format stream "~&{~%")
 457        (write body :stream stream :pretty nil :escape nil)
 458        (format stream "~&}~%"))
 459       ((class :direct-method method :end)
 460        (terpri stream)))))
 461
 462 (defmethod hook-output progn
 463     ((method basic-effective-method) (reason (eql :c)) sequencer)
 464   (with-slots ((class %class) functions) method
 465     (sequence-output (stream sequencer)
 466       ((class :effective-methods)
 467        (dolist (func functions)
 468          (write func :stream stream :escape nil :circle nil))))))
 469
 470 ;;;--------------------------------------------------------------------------
 471 ;;; Vtables.
 472
 473 (defmethod hook-output progn ((vtable vtable) (reason (eql :c)) sequencer)
 474   (with-slots ((class %class) chain-head chain-tail) vtable
 475     (sequence-output (stream sequencer)
 476       :constraint ((class :vtables :start)
 477                    (class :vtable chain-head :start)
 478                    (class :vtable chain-head :end)
 479                    (class :vtables :end))
 480       ((class :vtable chain-head :start)
 481        (format stream "/* Vtable for ~A chain. */~@
 482                        const union ~A ~A = { {~%"
 483                chain-head
 484                (vtable-union-tag chain-tail chain-head)
 485                (vtable-name class chain-head)))
 486       ((class :vtable chain-head :end)
 487        (format stream "} };~2%")))))
 488
 489 (defmethod hook-output progn
 490     ((cptr class-pointer) (reason (eql :c)) sequencer)
 491   (with-slots ((class %class) chain-head metaclass meta-chain-head) cptr
 492     (sequence-output (stream sequencer)
 493       :constraint ((class :vtable chain-head :start)
 494                    (class :vtable chain-head :class-pointer metaclass)
 495                    (class :vtable chain-head :end))
 496       ((class :vtable chain-head :class-pointer metaclass)
 497        (format stream "  /* ~21@A = */ &~A__classobj.~A.~A,~%"
 498                (if (sod-class-direct-superclasses meta-chain-head)
 499                    (format nil "_cls_~A"
 500                            (sod-class-nickname meta-chain-head))
 501                    "_class")
 502                class
 503                (sod-class-nickname meta-chain-head)
 504                (sod-class-nickname metaclass))))))
 505
 506 (defmethod hook-output progn ((boff base-offset) (reason (eql :c)) sequencer)
 507   (with-slots ((class %class) chain-head) boff
 508     (sequence-output (stream sequencer)
 509       :constraint ((class :vtable chain-head :start)
 510                    (class :vtable chain-head :base-offset)
 511                    (class :vtable chain-head :end))
 512       ((class :vtable chain-head :base-offset)
 513        (format stream "  /* ~21@A = */ offsetof(struct ~A, ~A),~%"
 514                "_base"
 515                (ilayout-struct-tag class)
 516                (sod-class-nickname chain-head))))))
 517
 518 (defmethod hook-output progn
 519     ((choff chain-offset) (reason (eql :c)) sequencer)
 520   (with-slots ((class %class) chain-head target-head) choff
 521     (sequence-output (stream sequencer)
 522       :constraint ((class :vtable chain-head :start)
 523                    (class :vtable chain-head :chain-offset target-head)
 524                    (class :vtable chain-head :end))
 525       ((class :vtable chain-head :chain-offset target-head)
 526        (format stream "  /* ~21@A = */ SOD_OFFSETDIFF(struct ~A, ~A, ~A),~%"
 527                (format nil "_off_~A" (sod-class-nickname target-head))
 528                (ilayout-struct-tag class)
 529                (sod-class-nickname chain-head)
 530                (sod-class-nickname target-head))))))
 531
 532 (defmethod hook-output progn ((vtmsgs vtmsgs) (reason (eql :c)) sequencer)
 533   (with-slots ((class %class) subclass chain-head) vtmsgs
 534     (sequence-output (stream sequencer)
 535       :constraint ((subclass :vtable chain-head :start)
 536                    (subclass :vtable chain-head :vtmsgs class :start)
 537                    (subclass :vtable chain-head :vtmsgs class :slots)
 538                    (subclass :vtable chain-head :vtmsgs class :end)
 539                    (subclass :vtable chain-head :end))
 540       ((subclass :vtable chain-head :vtmsgs class :start)
 541        (format stream "  { /* Method entries for ~A messages. */~%"
 542                class))
 543       ((subclass :vtable chain-head :vtmsgs class :end)
 544        (format stream "  },~%")))))
 545
 546 (defmethod hook-output progn
 547     ((entry method-entry) (reason (eql :c)) sequencer)
 548   (with-slots ((method %method) chain-head chain-tail role) entry
 549     (let* ((message (effective-method-message method))
 550            (class (effective-method-class method))
 551            (super (sod-message-class message)))
 552       (sequence-output (stream sequencer)
 553         ((class :vtable chain-head :vtmsgs super :slots)
 554          (format stream "    /* ~19@A = */ ~A,~%"
 555                  (method-entry-slot-name entry)
 556                  (method-entry-function-name method chain-head role)))))))
 557
 558 ;;;--------------------------------------------------------------------------
 559 ;;; Filling in the class object.
 560
 561 (defmethod hook-output progn
 562     ((ichain ichain) (reason (eql 'class)) sequencer)
 563   (with-slots ((class %class) chain-head) ichain
 564     (sequence-output (stream sequencer)
 565       :constraint ((*instance-class* :object :start)
 566                    (*instance-class* :object chain-head :ichain :start)
 567                    (*instance-class* :object chain-head :ichain :end)
 568                    (*instance-class* :object :end))
 569       ((*instance-class* :object chain-head :ichain :start)
 570        (format stream "  { { /* ~A ichain */~%"
 571                (sod-class-nickname chain-head)))
 572       ((*instance-class* :object chain-head :ichain :end)
 573        (format stream "  } },~%")))))
 574
 575 (defmethod hook-output progn
 576     ((islots islots) (reason (eql 'class)) sequencer)
 577   (with-slots ((class %class)) islots
 578     (let ((chain-head (sod-class-chain-head class)))
 579       (sequence-output (stream sequencer)
 580         :constraint ((*instance-class* :object chain-head :ichain :start)
 581                      (*instance-class* :object class :slots :start)
 582                      (*instance-class* :object class :slots)
 583                      (*instance-class* :object class :slots :end)
 584                      (*instance-class* :object chain-head :ichain :end))
 585         ((*instance-class* :object class :slots :start)
 586          (format stream "      { /* Class ~A */~%" class))
 587         ((*instance-class* :object class :slots :end)
 588          (format stream "      },~%"))))))
 589
 590 (defmethod hook-output progn
 591     ((vtptr vtable-pointer) (reason (eql 'class)) sequencer)
 592   (with-slots ((class %class) chain-head chain-tail) vtptr
 593     (sequence-output (stream sequencer)
 594       :constraint ((*instance-class* :object chain-head :ichain :start)
 595                    (*instance-class* :object chain-head :vtable)
 596                    (*instance-class* :object chain-head :ichain :end))
 597       ((*instance-class* :object chain-head :vtable)
 598        (format stream "      /* ~17@A = */ &~A.~A,~%"
 599                "_vt"
 600                (vtable-name class chain-head)
 601                (sod-class-nickname chain-tail))))))
 602
 603 (defgeneric find-class-initializer (slot class)
 604   (:method ((slot effective-slot) (class sod-class))
 605     (let ((dslot (effective-slot-direct-slot slot)))
 606       (or (some (lambda (super)
 607                   (find dslot (sod-class-class-initializers super)
 608                         :test #'sod-initializer-slot))
 609                 (sod-class-precedence-list class))
 610           (effective-slot-initializer slot)))))
 611
 612 (defgeneric output-class-initializer (slot instance stream)
 613   (:method ((slot sod-class-effective-slot) (instance sod-class) stream)
 614     (let ((func (effective-slot-initializer-function slot))
 615           (direct-slot (effective-slot-direct-slot slot)))
 616       (if func
 617           (format stream "        /* ~15@A = */ ~A,~%"
 618                   (sod-slot-name direct-slot)
 619                   (funcall func instance))
 620           (call-next-method))))
 621   (:method ((slot effective-slot) (instance sod-class) stream)
 622     (let ((init (find-class-initializer slot instance))
 623           (direct-slot (effective-slot-direct-slot slot)))
 624       (ecase (sod-initializer-value-kind init)
 625         (:simple (format stream "        /* ~15@A = */ ~A,~%"
 626                          (sod-slot-name direct-slot)
 627                          (sod-initializer-value-form init)))
 628         (:compound (format stream "        /* ~15@A = */ ~@<{ ~;~A~; },~:>~%"
 629                            (sod-slot-name direct-slot)
 630                            (sod-initializer-value-form init)))))))
 631
 632 (defmethod hook-output progn
 633     ((slot sod-class-effective-slot) (reason (eql 'class)) sequencer)
 634   (let ((instance *instance-class*)
 635         (func (effective-slot-prepare-function slot)))
 636     (when func
 637       (sequence-output (stream sequencer)
 638         ((instance :object :prepare)
 639          (funcall func instance stream))))))
 640
 641 (defmethod hook-output progn
 642     ((slot effective-slot) (reason (eql 'class)) sequencer)
 643   (with-slots ((class %class) (dslot slot)) slot
 644     (let ((instance *instance-class*)
 645           (super (sod-slot-class dslot)))
 646       (sequence-output (stream sequencer)
 647         ((instance :object super :slots)
 648          (output-class-initializer slot instance stream))))))
 649
 650 ;;;----- That's all, folks --------------------------------------------------