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     (when (eq class chain-tail)
 259       (sequence-output (stream sequencer)
 260         ((class :ichain chain-head :slots)
 261          (format stream "  const struct ~A *_vt;~%"
 262                  (vtable-struct-tag chain-tail chain-head)))))))
 263
 264 (defmethod hook-output progn ((islots islots) (reason (eql :h)) sequencer)
 265   (with-slots ((class %class) subclass slots) islots
 266     (let ((head (sod-class-chain-head class)))
 267       (when (eq head (sod-class-chain-head subclass))
 268         (sequence-output (stream sequencer)
 269           ((subclass :ichain (sod-class-chain-head class) :slots)
 270            (format stream "  struct ~A ~A;~%"
 271                    (islots-struct-tag class)
 272                    (sod-class-nickname class))))))))
 273
 274 ;;;--------------------------------------------------------------------------
 275 ;;; Vtable structure.
 276
 277 (defmethod hook-output progn
 278     ((method sod-method) (reason (eql :h)) sequencer)
 279   (with-slots ((class %class)) method
 280     (sequence-output (stream sequencer)
 281       ((class :methods)
 282        (let ((type (sod-method-function-type method)))
 283          (princ "extern " stream)
 284          (pprint-c-type (commentify-function-type type) stream
 285                         (sod-method-function-name method))
 286          (format stream ";~%"))))))
 287
 288 (defmethod hook-output progn ((vtable vtable) (reason (eql :h)) sequencer)
 289   (with-slots ((class %class) chain-head chain-tail) vtable
 290     (when (eq class chain-tail)
 291       (sequence-output (stream sequencer)
 292         :constraint ((class :vtables :start)
 293                      (class :vtable chain-head :start)
 294                      (class :vtable chain-head :slots)
 295                      (class :vtable chain-head :end)
 296                      (class :vtables :end))
 297         ((class :vtable chain-head :start)
 298          (format stream "/* Vtable structure. */~@
 299                          struct ~A {~%"
 300                  (vtable-struct-tag chain-tail chain-head)))
 301         ((class :vtable chain-head :end)
 302          (format stream "};~2%")
 303          (format stream "/* Union of equivalent superclass vtables. */~@
 304                          union ~A {~@
 305                          ~:{  struct ~A ~A;~%~}~
 306                          };~2%"
 307                  (vtable-union-tag chain-tail chain-head)
 308
 309                  ;; As for the ichain union, make sure the most specific
 310                  ;; class is first.
 311                  (mapcar (lambda (super)
 312                            (list (vtable-struct-tag super chain-head)
 313                                  (sod-class-nickname super)))
 314                          (sod-class-chain chain-tail))))))
 315     (sequence-output (stream sequencer)
 316       ((class :vtable-externs)
 317        (format stream "~@<extern const union ~A ~2I~_~A;~:>~%"
 318                (vtable-union-tag chain-tail chain-head)
 319                (vtable-name class chain-head))))))
 320
 321 (defmethod hook-output progn ((vtmsgs vtmsgs) (reason (eql :h)) sequencer)
 322   (with-slots ((class %class) subclass chain-head chain-tail) vtmsgs
 323     (when (eq subclass chain-tail)
 324       (sequence-output (stream sequencer)
 325         ((subclass :vtable chain-head :slots)
 326          (format stream "  struct ~A ~A;~%"
 327                  (vtmsgs-struct-tag subclass class)
 328                  (sod-class-nickname class)))))))
 329
 330 (defmethod hook-output progn
 331     ((vtmsgs vtmsgs) (reason (eql 'vtmsgs)) sequencer)
 332   (when (vtmsgs-entries vtmsgs)
 333     (with-slots ((class %class) subclass) vtmsgs
 334       (sequence-output (stream sequencer)
 335         :constraint ((subclass :vtmsgs :start)
 336                      (subclass :vtmsgs class :start)
 337                      (subclass :vtmsgs class :slots)
 338                      (subclass :vtmsgs class :end)
 339                      (subclass :vtmsgs :end))
 340         ((subclass :vtmsgs class :start)
 341          (format stream "/* Messages protocol from class ~A */~@
 342                          struct ~A {~%"
 343                  class
 344                  (vtmsgs-struct-tag subclass class)))
 345         ((subclass :vtmsgs class :end)
 346          (format stream "};~2%"))))))
 347
 348 (defmethod hook-output progn
 349     ((entry method-entry) (reason (eql 'vtmsgs)) sequencer)
 350   (let* ((method (method-entry-effective-method entry))
 351          (message (effective-method-message method))
 352          (class (effective-method-class method))
 353          (function-type (method-entry-function-type entry))
 354          (commented-type (commentify-function-type function-type))
 355          (pointer-type (make-pointer-type commented-type)))
 356     (sequence-output (stream sequencer)
 357       ((class :vtmsgs (sod-message-class message) :slots)
 358        (pprint-logical-block (stream nil :prefix "  " :suffix ";")
 359          (pprint-c-type pointer-type stream (method-entry-slot-name entry)))
 360        (terpri stream)))))
 361
 362 (defmethod hook-output progn
 363     ((cptr class-pointer) (reason (eql :h)) sequencer)
 364   (with-slots ((class %class) chain-head metaclass meta-chain-head) cptr
 365     (when (eq chain-head (sod-class-chain-head class))
 366       (sequence-output (stream sequencer)
 367         ((class :vtable chain-head :slots)
 368          (format stream "  const ~A *~:[_class~;~:*_cls_~A~];~%"
 369                  metaclass
 370                  (and (sod-class-direct-superclasses meta-chain-head)
 371                       (sod-class-nickname meta-chain-head))))))))
 372
 373 (defmethod hook-output progn ((boff base-offset) (reason (eql :h)) sequencer)
 374   (with-slots ((class %class) chain-head) boff
 375     (when (eq chain-head (sod-class-chain-head class))
 376       (sequence-output (stream sequencer)
 377         ((class :vtable chain-head :slots)
 378          (write-line "  size_t _base;" stream))))))
 379
 380 (defmethod hook-output progn
 381     ((choff chain-offset) (reason (eql :h)) sequencer)
 382   (with-slots ((class %class) chain-head target-head) choff
 383     (when (eq chain-head (sod-class-chain-head class))
 384       (sequence-output (stream sequencer)
 385         ((class :vtable chain-head :slots)
 386          (format stream "  ptrdiff_t _off_~A;~%"
 387                  (sod-class-nickname target-head)))))))
 388
 389 ;;;--------------------------------------------------------------------------
 390 ;;; Implementation output.
 391
 392 (export '*instance-class*)
 393 (defvar *instance-class* nil
 394   "The class currently being output.
 395
 396    This is bound during the `hook-output' traversal of a class layout for
 397    `:c' output, since some of the objects traversed actually `belong' to
 398    superclasses and there's no other way to find out what the reference class
 399    actually is.
 400
 401    It may be bound at other times.")
 402
 403 (defmethod hook-output progn ((class sod-class) (reason (eql :c)) sequencer)
 404   (sequence-output (stream sequencer)
 405
 406     :constraint
 407     ((:classes :start)
 408      (class :banner)
 409      (class :direct-methods :start) (class :direct-methods :end)
 410      (class :effective-methods)
 411      (class :vtables :start) (class :vtables :end)
 412      (class :object :prepare) (class :object :start) (class :object :end)
 413      (:classes :end))
 414
 415     ((class :banner)
 416      (banner (format nil "Class ~A" class) stream))
 417
 418     ((class :object :start)
 419      (format stream "~
 420 /* The class object. */
 421 const struct ~A ~A__classobj = {~%"
 422              (ilayout-struct-tag (sod-class-metaclass class))
 423              class))
 424     ((class :object :end)
 425      (format stream "};~2%")))
 426
 427   (let ((*instance-class* class))
 428     (hook-output (sod-class-ilayout (sod-class-metaclass class))
 429                  'class sequencer)))
 430
 431 ;;;--------------------------------------------------------------------------
 432 ;;; Direct and effective methods.
 433
 434 (defmethod hook-output progn
 435     ((method delegating-direct-method) (reason (eql :c)) sequencer)
 436   (with-slots ((class %class) body) method
 437     (unless body
 438       (return-from hook-output))
 439     (sequence-output (stream sequencer)
 440       ((class :direct-method method :start)
 441        (format stream "#define CALL_NEXT_METHOD (next_method(~{~A~^, ~}))~%"
 442                (mapcar #'argument-name
 443                        (c-function-arguments (sod-method-next-method-type
 444                                               method)))))
 445       ((class :direct-method method :end)
 446        (format stream "#undef CALL_NEXT_METHOD~%")))))
 447
 448 (defmethod hook-output progn
 449     ((method sod-method) (reason (eql :c)) sequencer)
 450   (with-slots ((class %class) body) method
 451     (unless body
 452       (return-from hook-output))
 453     (sequence-output (stream sequencer)
 454       :constraint ((class :direct-methods :start)
 455                    (class :direct-method method :start)
 456                    (class :direct-method method :body)
 457                    (class :direct-method method :end)
 458                    (class :direct-methods :end))
 459       ((class :direct-method method :body)
 460        (pprint-c-type (sod-method-function-type method)
 461                       stream
 462                       (sod-method-function-name method))
 463        (format stream "~&{~%")
 464        (write body :stream stream :pretty nil :escape nil)
 465        (format stream "~&}~%"))
 466       ((class :direct-method method :end)
 467        (terpri stream)))))
 468
 469 (defmethod hook-output progn
 470     ((method basic-effective-method) (reason (eql :c)) sequencer)
 471   (with-slots ((class %class) functions) method
 472     (sequence-output (stream sequencer)
 473       ((class :effective-methods)
 474        (dolist (func functions)
 475          (write func :stream stream :escape nil :circle nil))))))
 476
 477 ;;;--------------------------------------------------------------------------
 478 ;;; Vtables.
 479
 480 (defmethod hook-output progn ((vtable vtable) (reason (eql :c)) sequencer)
 481   (with-slots ((class %class) chain-head chain-tail) vtable
 482     (sequence-output (stream sequencer)
 483       :constraint ((class :vtables :start)
 484                    (class :vtable chain-head :start)
 485                    (class :vtable chain-head :end)
 486                    (class :vtables :end))
 487       ((class :vtable chain-head :start)
 488        (format stream "/* Vtable for ~A chain. */~@
 489                        const union ~A ~A = { {~%"
 490                chain-head
 491                (vtable-union-tag chain-tail chain-head)
 492                (vtable-name class chain-head)))
 493       ((class :vtable chain-head :end)
 494        (format stream "} };~2%")))))
 495
 496 (defmethod hook-output progn
 497     ((cptr class-pointer) (reason (eql :c)) sequencer)
 498   (with-slots ((class %class) chain-head metaclass meta-chain-head) cptr
 499     (sequence-output (stream sequencer)
 500       :constraint ((class :vtable chain-head :start)
 501                    (class :vtable chain-head :class-pointer metaclass)
 502                    (class :vtable chain-head :end))
 503       ((class :vtable chain-head :class-pointer metaclass)
 504        (format stream "  /* ~21@A = */ &~A__classobj.~A.~A,~%"
 505                (if (sod-class-direct-superclasses meta-chain-head)
 506                    (format nil "_cls_~A"
 507                            (sod-class-nickname meta-chain-head))
 508                    "_class")
 509                class
 510                (sod-class-nickname meta-chain-head)
 511                (sod-class-nickname metaclass))))))
 512
 513 (defmethod hook-output progn ((boff base-offset) (reason (eql :c)) sequencer)
 514   (with-slots ((class %class) chain-head) boff
 515     (sequence-output (stream sequencer)
 516       :constraint ((class :vtable chain-head :start)
 517                    (class :vtable chain-head :base-offset)
 518                    (class :vtable chain-head :end))
 519       ((class :vtable chain-head :base-offset)
 520        (format stream "  /* ~21@A = */ offsetof(struct ~A, ~A),~%"
 521                "_base"
 522                (ilayout-struct-tag class)
 523                (sod-class-nickname chain-head))))))
 524
 525 (defmethod hook-output progn
 526     ((choff chain-offset) (reason (eql :c)) sequencer)
 527   (with-slots ((class %class) chain-head target-head) choff
 528     (sequence-output (stream sequencer)
 529       :constraint ((class :vtable chain-head :start)
 530                    (class :vtable chain-head :chain-offset target-head)
 531                    (class :vtable chain-head :end))
 532       ((class :vtable chain-head :chain-offset target-head)
 533        (format stream "  /* ~21@A = */ SOD_OFFSETDIFF(struct ~A, ~A, ~A),~%"
 534                (format nil "_off_~A" (sod-class-nickname target-head))
 535                (ilayout-struct-tag class)
 536                (sod-class-nickname chain-head)
 537                (sod-class-nickname target-head))))))
 538
 539 (defmethod hook-output progn ((vtmsgs vtmsgs) (reason (eql :c)) sequencer)
 540   (with-slots ((class %class) subclass chain-head) vtmsgs
 541     (sequence-output (stream sequencer)
 542       :constraint ((subclass :vtable chain-head :start)
 543                    (subclass :vtable chain-head :vtmsgs class :start)
 544                    (subclass :vtable chain-head :vtmsgs class :slots)
 545                    (subclass :vtable chain-head :vtmsgs class :end)
 546                    (subclass :vtable chain-head :end))
 547       ((subclass :vtable chain-head :vtmsgs class :start)
 548        (format stream "  { /* Method entries for ~A messages. */~%"
 549                class))
 550       ((subclass :vtable chain-head :vtmsgs class :end)
 551        (format stream "  },~%")))))
 552
 553 (defmethod hook-output progn
 554     ((entry method-entry) (reason (eql :c)) sequencer)
 555   (with-slots ((method %method) chain-head chain-tail role) entry
 556     (let* ((message (effective-method-message method))
 557            (class (effective-method-class method))
 558            (super (sod-message-class message)))
 559       (sequence-output (stream sequencer)
 560         ((class :vtable chain-head :vtmsgs super :slots)
 561          (format stream "    /* ~19@A = */ ~A,~%"
 562                  (method-entry-slot-name entry)
 563                  (method-entry-function-name method chain-head role)))))))
 564
 565 ;;;--------------------------------------------------------------------------
 566 ;;; Filling in the class object.
 567
 568 (defmethod hook-output progn
 569     ((ichain ichain) (reason (eql 'class)) sequencer)
 570   (with-slots ((class %class) chain-head) ichain
 571     (sequence-output (stream sequencer)
 572       :constraint ((*instance-class* :object :start)
 573                    (*instance-class* :object chain-head :ichain :start)
 574                    (*instance-class* :object chain-head :ichain :end)
 575                    (*instance-class* :object :end))
 576       ((*instance-class* :object chain-head :ichain :start)
 577        (format stream "  { { /* ~A ichain */~%"
 578                (sod-class-nickname chain-head)))
 579       ((*instance-class* :object chain-head :ichain :end)
 580        (format stream "  } },~%")))))
 581
 582 (defmethod hook-output progn
 583     ((islots islots) (reason (eql 'class)) sequencer)
 584   (with-slots ((class %class)) islots
 585     (let ((chain-head (sod-class-chain-head class)))
 586       (sequence-output (stream sequencer)
 587         :constraint ((*instance-class* :object chain-head :ichain :start)
 588                      (*instance-class* :object class :slots :start)
 589                      (*instance-class* :object class :slots)
 590                      (*instance-class* :object class :slots :end)
 591                      (*instance-class* :object chain-head :ichain :end))
 592         ((*instance-class* :object class :slots :start)
 593          (format stream "      { /* Class ~A */~%" class))
 594         ((*instance-class* :object class :slots :end)
 595          (format stream "      },~%"))))))
 596
 597 (defmethod hook-output progn
 598     ((vtptr vtable-pointer) (reason (eql 'class)) sequencer)
 599   (with-slots ((class %class) chain-head chain-tail) vtptr
 600     (sequence-output (stream sequencer)
 601       :constraint ((*instance-class* :object chain-head :ichain :start)
 602                    (*instance-class* :object chain-head :vtable)
 603                    (*instance-class* :object chain-head :ichain :end))
 604       ((*instance-class* :object chain-head :vtable)
 605        (format stream "      /* ~17@A = */ &~A.~A,~%"
 606                "_vt"
 607                (vtable-name class chain-head)
 608                (sod-class-nickname chain-tail))))))
 609
 610 (defgeneric find-class-initializer (slot class)
 611   (:method ((slot effective-slot) (class sod-class))
 612     (let ((dslot (effective-slot-direct-slot slot)))
 613       (or (some (lambda (super)
 614                   (find dslot (sod-class-class-initializers super)
 615                         :test #'sod-initializer-slot))
 616                 (sod-class-precedence-list class))
 617           (effective-slot-initializer slot)))))
 618
 619 (defgeneric output-class-initializer (slot instance stream)
 620   (:method ((slot sod-class-effective-slot) (instance sod-class) stream)
 621     (let ((func (effective-slot-initializer-function slot))
 622           (direct-slot (effective-slot-direct-slot slot)))
 623       (if func
 624           (format stream "        /* ~15@A = */ ~A,~%"
 625                   (sod-slot-name direct-slot)
 626                   (funcall func instance))
 627           (call-next-method))))
 628   (:method ((slot effective-slot) (instance sod-class) stream)
 629     (let ((init (find-class-initializer slot instance))
 630           (direct-slot (effective-slot-direct-slot slot)))
 631       (ecase (sod-initializer-value-kind init)
 632         (:simple (format stream "        /* ~15@A = */ ~A,~%"
 633                          (sod-slot-name direct-slot)
 634                          (sod-initializer-value-form init)))
 635         (:compound (format stream "        /* ~15@A = */ ~@<{ ~;~A~; },~:>~%"
 636                            (sod-slot-name direct-slot)
 637                            (sod-initializer-value-form init)))))))
 638
 639 (defmethod hook-output progn
 640     ((slot sod-class-effective-slot) (reason (eql 'class)) sequencer)
 641   (let ((instance *instance-class*)
 642         (func (effective-slot-prepare-function slot)))
 643     (when func
 644       (sequence-output (stream sequencer)
 645         ((instance :object :prepare)
 646          (funcall func instance stream))))))
 647
 648 (defmethod hook-output progn
 649     ((slot effective-slot) (reason (eql 'class)) sequencer)
 650   (with-slots ((class %class) (dslot slot)) slot
 651     (let ((instance *instance-class*)
 652           (super (sod-slot-class dslot)))
 653       (sequence-output (stream sequencer)
 654         ((instance :object super :slots)
 655          (output-class-initializer slot instance stream))))))
 656
 657 ;;;----- That's all, folks --------------------------------------------------