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 :after ((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 :after ((ilayout ilayout) reason sequencer)
  39   (with-slots (ichains) ilayout
  40     (dolist (ichain ichains) (hook-output ichain reason sequencer))))
  41
  42 (defmethod hook-output :after ((ichain ichain) reason sequencer)
  43   (dolist (item (ichain-body ichain)) (hook-output item reason sequencer)))
  44
  45 (defmethod hook-output :after ((islots islots) reason sequencer)
  46   (dolist (slot (islots-slots islots)) (hook-output slot reason sequencer)))
  47
  48 (defmethod hook-output :after ((vtable vtable) reason sequencer)
  49   (with-slots (body) vtable
  50     (dolist (item body) (hook-output item reason sequencer))))
  51
  52 (defmethod hook-output :after ((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 ((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 :defs)
  72      (class :methods) (class :methods :end)
  73      (class :ichains :start) (class :ichains :end)
  74      (class :ilayout :start) (class :ilayout :slots) (class :ilayout :end)
  75      (class :conversions)
  76      (class :message-macros)
  77      (class :object)
  78      (:classes :end))
  79
  80     (:typedefs
  81      (format stream "typedef struct ~A ~A;~%"
  82              (ichain-struct-tag class (sod-class-chain-head class)) class))
  83
  84     ((class :banner)
  85      (banner (format nil "Class ~A" class) stream))
  86     ((class :vtable-externs-after)
  87      (terpri stream))
  88
  89     ((class :vtable-externs)
  90      (format stream "/* Vtable structures. */~%"))
  91
  92     ((class :object)
  93      (let ((metaclass (sod-class-metaclass class))
  94            (metaroot (find-root-metaclass class)))
  95        (format stream "/* The class object. */~@
  96                        extern const struct ~A ~A__classobj;~@
  97                        #define ~:*~A__class (&~:*~A__classobj.~A.~A)~%"
  98                (ilayout-struct-tag metaclass) class
  99                (sod-class-nickname (sod-class-chain-head metaroot))
 100                (sod-class-nickname metaroot))
 101        (dolist (chain (sod-class-chains metaclass))
 102          (let ((tail (car chain)))
 103            (unless (eq tail metaroot)
 104              (format stream "#define ~A__cls_~A (&~2:*~A__classobj.~A.~A)~%"
 105                      class (sod-class-nickname (sod-class-chain-head tail))
 106                      (sod-class-nickname tail)))))
 107        (terpri stream))))
 108
 109   ;; Maybe generate an islots structure.
 110   (when (sod-class-slots class)
 111     (sequence-output (stream sequencer)
 112       ((class :islots :start)
 113        (format stream "/* Instance slots. */~@
 114                        struct ~A {~%"
 115                (islots-struct-tag class)))
 116       ((class :islots :end)
 117        (format stream "};~2%"))))
 118
 119   ;; Declare the direct methods.
 120   (when (sod-class-methods class)
 121     (sequence-output (stream sequencer)
 122       ((class :methods :start)
 123        (format stream "/* Direct methods. */~%"))
 124       ((class :methods :end)
 125        (terpri stream))))
 126
 127   ;; Provide upcast macros which do the right thing.
 128   (when (sod-class-direct-superclasses class)
 129     (sequence-output (stream sequencer)
 130       ((class :conversions)
 131        (let ((chain-head (sod-class-chain-head class)))
 132          (format stream "/* Conversion macros. */~%")
 133          (dolist (super (cdr (sod-class-precedence-list class)))
 134            (let ((super-head (sod-class-chain-head super)))
 135              (format stream "#define ~:@(~A__CONV_~A~)(_obj) ((~A *)~
 136                                      ~:[SOD_XCHAIN(~A, (_obj))~;(_obj)~])~%"
 137                      class (sod-class-nickname super) super
 138                      (eq chain-head super-head)
 139                      (sod-class-nickname super-head))))
 140          (terpri stream)))))
 141
 142   ;; Provide convenience macros for sending the newly defined messages.  (The
 143   ;; macros work on all subclasses too.)
 144   ;;
 145   ;; We need each message's method entry type for this, so we need to dig it
 146   ;; out of the vtmsgs structure.  Indeed, the vtmsgs for this class contains
 147   ;; entries for precisely the messages we want to make macros for.
 148   (when (some (lambda (message)
 149                 (or (keyword-message-p message)
 150                     (varargs-message-p message)))
 151               (sod-class-messages class))
 152     (one-off-output 'varargs-macros sequencer :early-decls
 153                     (lambda (stream)
 154                       (format stream
 155                               "~%SOD__VARARGS_MACROS_PREAMBLE~%"))))
 156   (when (sod-class-messages class)
 157     (sequence-output (stream sequencer)
 158       ((class :message-macros)
 159        (let* ((vtable (find (sod-class-chain-head class)
 160                             (sod-class-vtables class)
 161                             :key #'vtable-chain-head))
 162               (vtmsgs (find-if (lambda (item)
 163                                  (and (typep item 'vtmsgs)
 164                                       (eql (vtmsgs-class item) class)))
 165                                (vtable-body vtable))))
 166          (format stream "/* Message invocation macros. */~%")
 167          (dolist (entry (vtmsgs-entries vtmsgs))
 168            (let* ((type (method-entry-function-type entry))
 169                   (args (c-function-arguments type))
 170                   (in-names nil) (out-names nil) (varargsp nil) (me "me"))
 171              (do ((args args (cdr args)))
 172                  ((endp args))
 173                (let* ((raw-name (princ-to-string (argument-name (car args))))
 174                       (name (if (find raw-name
 175                                       (list "_vt"
 176                                             (sod-class-nickname class)
 177                                             (method-entry-slot-name entry))
 178                                       :test #'string=)
 179                                 (format nil "sod__a_~A" raw-name)
 180                                 raw-name)))
 181                  (cond ((and (cdr args) (eq (cadr args) :ellipsis))
 182                         (setf varargsp t)
 183                         (unless in-names (setf me "SOD__CAR(__VA_ARGS__)"))
 184                         (push (format nil "/*~A*/ ..." name) in-names)
 185                         (push "__VA_ARGS__" out-names)
 186                         (return))
 187                        (t
 188                         (push name in-names)
 189                         (push name out-names)))))
 190              (when varargsp
 191                (format stream "#ifdef SOD__HAVE_VARARGS_MACROS~%"))
 192              (format stream "#define ~A(~{~A~^, ~}) ~
 193                                    (~A)->_vt->~A.~A(~{~A~^, ~})~%"
 194                      (message-macro-name class entry)
 195                      (nreverse in-names)
 196                      me
 197                      (sod-class-nickname class)
 198                      (method-entry-slot-name entry)
 199                      (nreverse out-names))
 200              (when varargsp
 201                (format stream "#endif~%"))))
 202          (terpri stream))))))
 203
 204 (defmethod hook-output :after ((class sod-class) (reason (eql :h)) sequencer)
 205
 206   ;; Output a structure member definition for each instance slot.
 207   (dolist (slot (sod-class-slots class))
 208     (hook-output slot 'islots sequencer))
 209
 210   ;; Generate a vtmsgs structure for all superclasses.
 211   (hook-output (car (sod-class-vtables class)) 'vtmsgs sequencer))
 212
 213 ;;;--------------------------------------------------------------------------
 214 ;;; Instance structure.
 215
 216 (defmethod hook-output ((slot sod-slot) (reason (eql 'islots)) sequencer)
 217   (sequence-output (stream sequencer)
 218     (((sod-slot-class slot) :islots :slots)
 219      (pprint-logical-block (stream nil :prefix "  " :suffix ";")
 220        (pprint-c-type (sod-slot-type slot) stream (sod-slot-name slot)))
 221      (terpri stream))))
 222
 223 (defmethod hook-output ((ilayout ilayout) (reason (eql :h)) sequencer)
 224   (with-slots ((class %class)) ilayout
 225     (sequence-output (stream sequencer)
 226       ((class :ilayout :start)
 227        (format stream "/* Instance layout. */~@
 228                        struct ~A {~%"
 229                (ilayout-struct-tag class)))
 230       ((class :ilayout :end)
 231        (format stream "};~2%")))))
 232
 233 (defmethod hook-output :after ((ilayout ilayout) (reason (eql :h)) sequencer)
 234   (dolist (ichain (ilayout-ichains ilayout))
 235     (hook-output ichain 'ilayout sequencer)))
 236
 237 (defmethod hook-output ((ichain ichain) (reason (eql :h)) sequencer)
 238   (with-slots ((class %class) chain-head chain-tail) ichain
 239     (when (eq class chain-tail)
 240       (sequence-output (stream sequencer)
 241         :constraint ((class :ichains :start)
 242                      (class :ichain chain-head :start)
 243                      (class :ichain chain-head :slots)
 244                      (class :ichain chain-head :end)
 245                      (class :ichains :end))
 246         ((class :ichain chain-head :start)
 247          (format stream "/* Instance chain structure. */~@
 248                          struct ~A {~%"
 249                  (ichain-struct-tag chain-tail chain-head)))
 250         ((class :ichain chain-head :end)
 251          (format stream "};~2%")
 252          (format stream "/* Union of equivalent superclass chains. */~@
 253                          union ~A {~@
 254                          ~:{  struct ~A ~A;~%~}~
 255                          };~2%"
 256                  (ichain-union-tag chain-tail chain-head)
 257
 258                  ;; Make sure the most specific class is first: only the
 259                  ;; first element of a union can be statically initialized in
 260                  ;; C90.
 261                  (mapcar (lambda (super)
 262                            (list (ichain-struct-tag super chain-head)
 263                                  (sod-class-nickname super)))
 264                          (sod-class-chain chain-tail))))))))
 265
 266 (defmethod hook-output ((ichain ichain) (reason (eql 'ilayout)) sequencer)
 267   (with-slots ((class %class) chain-head chain-tail) ichain
 268     (sequence-output (stream sequencer)
 269       ((class :ilayout :slots)
 270        (format stream "  union ~A ~A;~%"
 271                (ichain-union-tag chain-tail chain-head)
 272                (sod-class-nickname chain-head))))))
 273
 274 (defmethod hook-output ((vtptr vtable-pointer) (reason (eql :h)) sequencer)
 275   (with-slots ((class %class) chain-head chain-tail) vtptr
 276     (when (eq class chain-tail)
 277       (sequence-output (stream sequencer)
 278         ((class :ichain chain-head :slots)
 279          (format stream "  const struct ~A *_vt;~%"
 280                  (vtable-struct-tag chain-tail chain-head)))))))
 281
 282 (defmethod hook-output ((islots islots) (reason (eql :h)) sequencer)
 283   (with-slots ((class %class) subclass slots) islots
 284     (let ((head (sod-class-chain-head class)))
 285       (when (eq head (sod-class-chain-head subclass))
 286         (sequence-output (stream sequencer)
 287           ((subclass :ichain (sod-class-chain-head class) :slots)
 288            (format stream "  struct ~A ~A;~%"
 289                    (islots-struct-tag class)
 290                    (sod-class-nickname class))))))))
 291
 292 ;;;--------------------------------------------------------------------------
 293 ;;; Vtable structure.
 294
 295 (defmethod hook-output ((method sod-method) (reason (eql :h)) sequencer)
 296   (with-slots ((class %class)) method
 297     (sequence-output (stream sequencer)
 298       ((class :methods)
 299        (let ((type (sod-method-function-type method)))
 300          (princ "extern " stream)
 301          (pprint-c-type (commentify-function-type type) stream
 302                         (sod-method-function-name method))
 303          (format stream ";~%")))
 304       ((class :methods :defs)
 305        (let* ((type (sod-method-type method))
 306               (keys (and (typep type 'c-keyword-function-type)
 307                          (c-function-keywords type))))
 308          (when keys
 309            (format stream "struct ~A {~%~
 310                            ~{  unsigned ~A: 1;~%~}~
 311                            };~2%"
 312                    (direct-method-suppliedp-struct-tag method)
 313                    (mapcar #'argument-name keys))))))))
 314
 315 (defmethod hook-output ((vtable vtable) (reason (eql :h)) sequencer)
 316   (with-slots ((class %class) chain-head chain-tail) vtable
 317     (when (eq class chain-tail)
 318       (sequence-output (stream sequencer)
 319         :constraint ((class :vtables :start)
 320                      (class :vtable chain-head :start)
 321                      (class :vtable chain-head :slots)
 322                      (class :vtable chain-head :end)
 323                      (class :vtables :end))
 324         ((class :vtable chain-head :start)
 325          (format stream "/* Vtable structure. */~@
 326                          struct ~A {~%"
 327                  (vtable-struct-tag chain-tail chain-head)))
 328         ((class :vtable chain-head :end)
 329          (format stream "};~2%")
 330          (format stream "/* Union of equivalent superclass vtables. */~@
 331                          union ~A {~@
 332                          ~:{  struct ~A ~A;~%~}~
 333                          };~2%"
 334                  (vtable-union-tag chain-tail chain-head)
 335
 336                  ;; As for the ichain union, make sure the most specific
 337                  ;; class is first.
 338                  (mapcar (lambda (super)
 339                            (list (vtable-struct-tag super chain-head)
 340                                  (sod-class-nickname super)))
 341                          (sod-class-chain chain-tail))))))
 342     (sequence-output (stream sequencer)
 343       ((class :vtable-externs)
 344        (format stream "~@<extern const union ~A ~2I~_~A;~:>~%"
 345                (vtable-union-tag chain-tail chain-head)
 346                (vtable-name class chain-head))))))
 347
 348 (defmethod hook-output ((vtmsgs vtmsgs) (reason (eql :h)) sequencer)
 349   (with-slots ((class %class) subclass chain-head chain-tail) vtmsgs
 350     (when (eq subclass chain-tail)
 351       (sequence-output (stream sequencer)
 352         ((subclass :vtable chain-head :slots)
 353          (format stream "  struct ~A ~A;~%"
 354                  (vtmsgs-struct-tag subclass class)
 355                  (sod-class-nickname class)))))))
 356
 357 (defmethod hook-output ((vtmsgs vtmsgs) (reason (eql 'vtmsgs)) sequencer)
 358   (when (vtmsgs-entries vtmsgs)
 359     (with-slots ((class %class) subclass) vtmsgs
 360       (sequence-output (stream sequencer)
 361         :constraint ((subclass :vtmsgs :start)
 362                      (subclass :vtmsgs class :start)
 363                      (subclass :vtmsgs class :slots)
 364                      (subclass :vtmsgs class :end)
 365                      (subclass :vtmsgs :end))
 366         ((subclass :vtmsgs class :start)
 367          (format stream "/* Messages protocol from class ~A */~@
 368                          struct ~A {~%"
 369                  class
 370                  (vtmsgs-struct-tag subclass class)))
 371         ((subclass :vtmsgs class :end)
 372          (format stream "};~2%"))))))
 373
 374 (defmethod hook-output ((entry method-entry)
 375                         (reason (eql 'vtmsgs)) sequencer)
 376   (let* ((method (method-entry-effective-method entry))
 377          (message (effective-method-message method))
 378          (class (effective-method-class method))
 379          (function-type (method-entry-function-type entry))
 380          (commented-type (commentify-function-type function-type))
 381          (pointer-type (make-pointer-type commented-type)))
 382     (sequence-output (stream sequencer)
 383       ((class :vtmsgs (sod-message-class message) :slots)
 384        (pprint-logical-block (stream nil :prefix "  " :suffix ";")
 385          (pprint-c-type pointer-type stream (method-entry-slot-name entry)))
 386        (terpri stream)))))
 387
 388 (defmethod hook-output ((cptr class-pointer) (reason (eql :h)) sequencer)
 389   (with-slots ((class %class) chain-head metaclass meta-chain-head) cptr
 390     (when (eq chain-head (sod-class-chain-head class))
 391       (sequence-output (stream sequencer)
 392         ((class :vtable chain-head :slots)
 393          (format stream "  const ~A *~:[_class~;~:*_cls_~A~];~%"
 394                  metaclass
 395                  (and (sod-class-direct-superclasses meta-chain-head)
 396                       (sod-class-nickname meta-chain-head))))))))
 397
 398 (defmethod hook-output ((boff base-offset) (reason (eql :h)) sequencer)
 399   (with-slots ((class %class) chain-head) boff
 400     (when (eq chain-head (sod-class-chain-head class))
 401       (sequence-output (stream sequencer)
 402         ((class :vtable chain-head :slots)
 403          (write-line "  size_t _base;" stream))))))
 404
 405 (defmethod hook-output ((choff chain-offset) (reason (eql :h)) sequencer)
 406   (with-slots ((class %class) chain-head target-head) choff
 407     (when (eq chain-head (sod-class-chain-head class))
 408       (sequence-output (stream sequencer)
 409         ((class :vtable chain-head :slots)
 410          (format stream "  ptrdiff_t _off_~A;~%"
 411                  (sod-class-nickname target-head)))))))
 412
 413 ;;;--------------------------------------------------------------------------
 414 ;;; Implementation output.
 415
 416 (export '*instance-class*)
 417 (defvar *instance-class* nil
 418   "The class currently being output.
 419
 420    This is bound during the `hook-output' traversal of a class layout for
 421    `:c' output, since some of the objects traversed actually `belong' to
 422    superclasses and there's no other way to find out what the reference class
 423    actually is.
 424
 425    It may be bound at other times.")
 426
 427 (defmethod hook-output ((class sod-class) (reason (eql :c)) sequencer)
 428   (sequence-output (stream sequencer)
 429
 430     :constraint
 431     ((:classes :start)
 432      (class :banner)
 433      (class :direct-methods :start) (class :direct-methods :end)
 434      (class :effective-methods)
 435      (class :vtables :start) (class :vtables :end)
 436      (class :object :prepare) (class :object :start) (class :object :end)
 437      (:classes :end))
 438
 439     ((class :banner)
 440      (banner (format nil "Class ~A" class) stream))
 441
 442     ((class :object :start)
 443      (format stream "~
 444 /* The class object. */
 445 const struct ~A ~A__classobj = {~%"
 446              (ilayout-struct-tag (sod-class-metaclass class))
 447              class))
 448     ((class :object :end)
 449      (format stream "};~2%"))))
 450
 451 (defmethod hook-output :after ((class sod-class) (reason (eql :c)) sequencer)
 452   (let ((*instance-class* class))
 453     (hook-output (sod-class-ilayout (sod-class-metaclass class))
 454                  'class sequencer)))
 455
 456 ;;;--------------------------------------------------------------------------
 457 ;;; Direct and effective methods.
 458
 459 (defmethod hook-output ((method delegating-direct-method)
 460                         (reason (eql :c)) sequencer)
 461   (with-slots ((class %class) body) method
 462     (unless body
 463       (return-from hook-output))
 464     (sequence-output (stream sequencer)
 465       ((class :direct-method method :start)
 466        (format stream "#define CALL_NEXT_METHOD (next_method(~{~A~^, ~}))~%"
 467                (mapcar #'argument-name
 468                        (c-function-arguments (sod-method-next-method-type
 469                                               method)))))
 470       ((class :direct-method method :end)
 471        (format stream "#undef CALL_NEXT_METHOD~%"))))
 472   (call-next-method))
 473
 474 (defmethod hook-output ((method sod-method) (reason (eql :c)) sequencer)
 475   (with-slots ((class %class) role body message) method
 476     (unless body
 477       (return-from hook-output))
 478     (sequence-output (stream sequencer)
 479       :constraint ((class :direct-methods :start)
 480                    (class :direct-method method :banner)
 481                    (class :direct-method method :start)
 482                    (class :direct-method method :body)
 483                    (class :direct-method method :end)
 484                    (class :direct-methods :end))
 485       ((class :direct-method method :banner)
 486        (format-banner-comment stream "Direct ~@[~(~A~) ~]method ~:_~
 487                                       on `~A.~A' ~:_defined by `~A'."
 488                               role
 489                               (sod-class-nickname
 490                                (sod-message-class message))
 491                               (sod-message-name message)
 492                               class)
 493        (fresh-line stream))
 494       ((class :direct-method method :body)
 495        (pprint-c-type (sod-method-function-type method)
 496                       stream
 497                       (sod-method-function-name method))
 498        (format stream "~&{~%")
 499        (write body :stream stream :pretty nil :escape nil)
 500        (format stream "~&}~%"))
 501       ((class :direct-method method :end)
 502        (terpri stream)))))
 503
 504 (defmethod hook-output ((method basic-effective-method)
 505                         (reason (eql :c)) sequencer)
 506   (with-slots ((class %class) functions) method
 507     (sequence-output (stream sequencer)
 508       ((class :effective-methods)
 509        (let* ((keys (effective-method-keywords method))
 510               (message (effective-method-message method))
 511               (msg-class (sod-message-class message)))
 512          (when keys
 513            (format-banner-comment stream "Keyword argument structure ~:_~
 514                                           for `~A.~A' ~:_on class `~A'."
 515                                   (sod-class-nickname msg-class)
 516                                   (sod-message-name message)
 517                                   class)
 518            (format stream "~&struct ~A {~%"
 519                    (effective-method-keyword-struct-tag method))
 520            (format stream "~{  unsigned ~A__suppliedp: 1;~%~}"
 521                    (mapcar #'argument-name keys))
 522            (dolist (key keys)
 523              (write-string "  " stream)
 524              (pprint-c-type (argument-type key) stream (argument-name key))
 525              (format stream ";~%"))
 526            (format stream "};~2%")))
 527        (dolist (func functions)
 528          (write func :stream stream :escape nil :circle nil))))))
 529
 530 ;;;--------------------------------------------------------------------------
 531 ;;; Vtables.
 532
 533 (defmethod hook-output ((vtable vtable) (reason (eql :c)) sequencer)
 534   (with-slots ((class %class) chain-head chain-tail) vtable
 535     (sequence-output (stream sequencer)
 536       :constraint ((class :vtables :start)
 537                    (class :vtable chain-head :start)
 538                    (class :vtable chain-head :end)
 539                    (class :vtables :end))
 540       ((class :vtable chain-head :start)
 541        (format stream "/* Vtable for ~A chain. */~@
 542                        const union ~A ~A = { {~%"
 543                chain-head
 544                (vtable-union-tag chain-tail chain-head)
 545                (vtable-name class chain-head)))
 546       ((class :vtable chain-head :end)
 547        (format stream "} };~2%")))))
 548
 549 (defmethod hook-output ((cptr class-pointer) (reason (eql :c)) sequencer)
 550   (with-slots ((class %class) chain-head metaclass meta-chain-head) cptr
 551     (sequence-output (stream sequencer)
 552       :constraint ((class :vtable chain-head :start)
 553                    (class :vtable chain-head :class-pointer metaclass)
 554                    (class :vtable chain-head :end))
 555       ((class :vtable chain-head :class-pointer metaclass)
 556        (format stream "  /* ~21@A = */ &~A__classobj.~A.~A,~%"
 557                (if (sod-class-direct-superclasses meta-chain-head)
 558                    (format nil "_cls_~A"
 559                            (sod-class-nickname meta-chain-head))
 560                    "_class")
 561                class
 562                (sod-class-nickname meta-chain-head)
 563                (sod-class-nickname metaclass))))))
 564
 565 (defmethod hook-output ((boff base-offset) (reason (eql :c)) sequencer)
 566   (with-slots ((class %class) chain-head) boff
 567     (sequence-output (stream sequencer)
 568       :constraint ((class :vtable chain-head :start)
 569                    (class :vtable chain-head :base-offset)
 570                    (class :vtable chain-head :end))
 571       ((class :vtable chain-head :base-offset)
 572        (format stream "  /* ~21@A = */ offsetof(struct ~A, ~A),~%"
 573                "_base"
 574                (ilayout-struct-tag class)
 575                (sod-class-nickname chain-head))))))
 576
 577 (defmethod hook-output ((choff chain-offset) (reason (eql :c)) sequencer)
 578   (with-slots ((class %class) chain-head target-head) choff
 579     (sequence-output (stream sequencer)
 580       :constraint ((class :vtable chain-head :start)
 581                    (class :vtable chain-head :chain-offset target-head)
 582                    (class :vtable chain-head :end))
 583       ((class :vtable chain-head :chain-offset target-head)
 584        (format stream "  /* ~21@A = */ SOD_OFFSETDIFF(struct ~A, ~A, ~A),~%"
 585                (format nil "_off_~A" (sod-class-nickname target-head))
 586                (ilayout-struct-tag class)
 587                (sod-class-nickname chain-head)
 588                (sod-class-nickname target-head))))))
 589
 590 (defmethod hook-output ((vtmsgs vtmsgs) (reason (eql :c)) sequencer)
 591   (with-slots ((class %class) subclass chain-head) vtmsgs
 592     (sequence-output (stream sequencer)
 593       :constraint ((subclass :vtable chain-head :start)
 594                    (subclass :vtable chain-head :vtmsgs class :start)
 595                    (subclass :vtable chain-head :vtmsgs class :slots)
 596                    (subclass :vtable chain-head :vtmsgs class :end)
 597                    (subclass :vtable chain-head :end))
 598       ((subclass :vtable chain-head :vtmsgs class :start)
 599        (format stream "  { /* Method entries for ~A messages. */~%"
 600                class))
 601       ((subclass :vtable chain-head :vtmsgs class :end)
 602        (format stream "  },~%")))))
 603
 604 (defmethod hook-output ((entry method-entry) (reason (eql :c)) sequencer)
 605   (with-slots ((method %method) chain-head chain-tail role) entry
 606     (let* ((message (effective-method-message method))
 607            (class (effective-method-class method))
 608            (super (sod-message-class message)))
 609       (sequence-output (stream sequencer)
 610         ((class :vtable chain-head :vtmsgs super :slots)
 611          (format stream "    /* ~19@A = */ ~A,~%"
 612                  (method-entry-slot-name entry)
 613                  (method-entry-function-name method chain-head role)))))))
 614
 615 ;;;--------------------------------------------------------------------------
 616 ;;; Filling in the class object.
 617
 618 (defmethod hook-output ((ichain ichain) (reason (eql 'class)) sequencer)
 619   (with-slots ((class %class) chain-head) ichain
 620     (sequence-output (stream sequencer)
 621       :constraint ((*instance-class* :object :start)
 622                    (*instance-class* :object chain-head :ichain :start)
 623                    (*instance-class* :object chain-head :ichain :end)
 624                    (*instance-class* :object :end))
 625       ((*instance-class* :object chain-head :ichain :start)
 626        (format stream "  { { /* ~A ichain */~%"
 627                (sod-class-nickname chain-head)))
 628       ((*instance-class* :object chain-head :ichain :end)
 629        (format stream "  } },~%")))))
 630
 631 (defmethod hook-output ((islots islots) (reason (eql 'class)) sequencer)
 632   (with-slots ((class %class)) islots
 633     (let ((chain-head (sod-class-chain-head class)))
 634       (sequence-output (stream sequencer)
 635         :constraint ((*instance-class* :object chain-head :ichain :start)
 636                      (*instance-class* :object class :slots :start)
 637                      (*instance-class* :object class :slots)
 638                      (*instance-class* :object class :slots :end)
 639                      (*instance-class* :object chain-head :ichain :end))
 640         ((*instance-class* :object class :slots :start)
 641          (format stream "      { /* Class ~A */~%" class))
 642         ((*instance-class* :object class :slots :end)
 643          (format stream "      },~%"))))))
 644
 645 (defmethod hook-output ((vtptr vtable-pointer)
 646                         (reason (eql 'class)) sequencer)
 647   (with-slots ((class %class) chain-head chain-tail) vtptr
 648     (sequence-output (stream sequencer)
 649       :constraint ((*instance-class* :object chain-head :ichain :start)
 650                    (*instance-class* :object chain-head :vtable)
 651                    (*instance-class* :object chain-head :ichain :end))
 652       ((*instance-class* :object chain-head :vtable)
 653        (format stream "      /* ~17@A = */ &~A.~A,~%"
 654                "_vt"
 655                (vtable-name class chain-head)
 656                (sod-class-nickname chain-tail))))))
 657
 658 (defgeneric output-class-initializer (slot instance stream)
 659   (:method ((slot sod-class-effective-slot) (instance sod-class) stream)
 660     (let ((func (effective-slot-initializer-function slot))
 661           (direct-slot (effective-slot-direct-slot slot)))
 662       (if func
 663           (format stream "        /* ~15@A = */ ~A,~%"
 664                   (sod-slot-name direct-slot)
 665                   (funcall func instance))
 666           (call-next-method))))
 667   (:method ((slot effective-slot) (instance sod-class) stream)
 668     (let ((init (find-class-initializer slot instance))
 669           (direct-slot (effective-slot-direct-slot slot)))
 670       (format stream "        /* ~15@A = */ ~A,~%"
 671               (sod-slot-name direct-slot)
 672               (sod-initializer-value init)))))
 673
 674 (defmethod hook-output ((slot sod-class-effective-slot)
 675                         (reason (eql 'class)) sequencer)
 676   (let ((instance *instance-class*)
 677         (func (effective-slot-prepare-function slot)))
 678     (when func
 679       (sequence-output (stream sequencer)
 680         ((instance :object :prepare)
 681          (funcall func instance stream)))))
 682   (call-next-method))
 683
 684 (defmethod hook-output ((slot effective-slot)
 685                         (reason (eql 'class)) sequencer)
 686   (with-slots ((class %class) (dslot slot)) slot
 687     (let ((instance *instance-class*)
 688           (super (sod-slot-class dslot)))
 689       (sequence-output (stream sequencer)
 690         ((instance :object super :slots)
 691          (output-class-initializer slot instance stream))))))
 692
 693 ;;;----- That's all, folks --------------------------------------------------