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 :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     (dolist (slot (sod-class-slots class))
 112       (hook-output slot 'islots sequencer))
 113     (sequence-output (stream sequencer)
 114       ((class :islots :start)
 115        (format stream "/* Instance slots. */~@
 116                        struct ~A {~%"
 117                (islots-struct-tag class)))
 118       ((class :islots :end)
 119        (format stream "};~2%"))))
 120
 121   ;; Declare the direct methods.
 122   (when (sod-class-methods class)
 123     (sequence-output (stream sequencer)
 124       ((class :methods :start)
 125        (format stream "/* Direct methods. */~%"))
 126       ((class :methods :end)
 127        (terpri stream))))
 128
 129   ;; Provide upcast macros which do the right thing.
 130   (when (sod-class-direct-superclasses class)
 131     (sequence-output (stream sequencer)
 132       ((class :conversions)
 133        (let ((chain-head (sod-class-chain-head class)))
 134          (format stream "/* Conversion macros. */~%")
 135          (dolist (super (cdr (sod-class-precedence-list class)))
 136            (let ((super-head (sod-class-chain-head super)))
 137              (format stream "#define ~:@(~A__CONV_~A~)(_obj) ((~A *)~
 138                                      ~:[SOD_XCHAIN(~A, (_obj))~;(_obj)~])~%"
 139                      class (sod-class-nickname super) super
 140                      (eq chain-head super-head)
 141                      (sod-class-nickname super-head))))
 142          (terpri stream)))))
 143
 144   ;; Provide convenience macros for sending the newly defined messages.  (The
 145   ;; macros work on all subclasses too.)
 146   ;;
 147   ;; We need each message's method entry type for this, so we need to dig it
 148   ;; out of the vtmsgs structure.  Indeed, the vtmsgs for this class contains
 149   ;; entries for precisely the messages we want to make macros for.
 150   (when (some (lambda (message)
 151                 (or (keyword-message-p message)
 152                     (varargs-message-p message)))
 153               (sod-class-messages class))
 154     (one-off-output 'varargs-macros sequencer :early-decls
 155                     (lambda (stream)
 156                       (format stream
 157                               "~%SOD__VARARGS_MACROS_PREAMBLE~%"))))
 158   (when (sod-class-messages class)
 159     (sequence-output (stream sequencer)
 160       ((class :message-macros)
 161        (let* ((vtable (find (sod-class-chain-head class)
 162                             (sod-class-vtables class)
 163                             :key #'vtable-chain-head))
 164               (vtmsgs (find-if (lambda (item)
 165                                  (and (typep item 'vtmsgs)
 166                                       (eql (vtmsgs-class item) class)))
 167                                (vtable-body vtable))))
 168          (format stream "/* Message invocation macros. */~%")
 169          (dolist (entry (vtmsgs-entries vtmsgs))
 170            (let* ((type (method-entry-function-type entry))
 171                   (args (c-function-arguments type))
 172                   (in-names nil) (out-names nil) (varargsp nil) (me "me"))
 173              (do ((args args (cdr args)))
 174                  ((endp args))
 175                (let* ((raw-name (princ-to-string (argument-name (car args))))
 176                       (name (if (find raw-name
 177                                       (list "_vt"
 178                                             (sod-class-nickname class)
 179                                             (method-entry-slot-name entry))
 180                                       :test #'string=)
 181                                 (format nil "sod__a_~A" raw-name)
 182                                 raw-name)))
 183                  (cond ((and (cdr args) (eq (cadr args) :ellipsis))
 184                         (setf varargsp t)
 185                         (unless in-names (setf me "SOD__CAR(__VA_ARGS__)"))
 186                         (push (format nil "/*~A*/ ..." name) in-names)
 187                         (push "__VA_ARGS__" out-names)
 188                         (return))
 189                        (t
 190                         (push name in-names)
 191                         (push name out-names)))))
 192              (when varargsp
 193                (format stream "#ifdef SOD__HAVE_VARARGS_MACROS~%"))
 194              (format stream "#define ~A(~{~A~^, ~}) ~
 195                                    (~A)->_vt->~A.~A(~{~A~^, ~})~%"
 196                      (message-macro-name class entry)
 197                      (nreverse in-names)
 198                      me
 199                      (sod-class-nickname class)
 200                      (method-entry-slot-name entry)
 201                      (nreverse out-names))
 202              (when varargsp
 203                (format stream "#endif~%"))))
 204          (terpri stream)))))
 205
 206   ;; Generate vtmsgs structure for all superclasses.
 207   (hook-output (car (sod-class-vtables class)) 'vtmsgs sequencer))
 208
 209 ;;;--------------------------------------------------------------------------
 210 ;;; Instance structure.
 211
 212 (defmethod hook-output progn
 213     ((slot sod-slot) (reason (eql 'islots)) sequencer)
 214   (sequence-output (stream sequencer)
 215     (((sod-slot-class slot) :islots :slots)
 216      (pprint-logical-block (stream nil :prefix "  " :suffix ";")
 217        (pprint-c-type (sod-slot-type slot) stream (sod-slot-name slot)))
 218      (terpri stream))))
 219
 220 (defmethod hook-output progn ((ilayout ilayout) (reason (eql :h)) sequencer)
 221   (with-slots ((class %class) ichains) ilayout
 222     (sequence-output (stream sequencer)
 223       ((class :ilayout :start)
 224        (format stream "/* Instance layout. */~@
 225                        struct ~A {~%"
 226                (ilayout-struct-tag class)))
 227       ((class :ilayout :end)
 228        (format stream "};~2%")))
 229     (dolist (ichain ichains)
 230       (hook-output ichain 'ilayout sequencer))))
 231
 232 (defmethod hook-output progn ((ichain ichain) (reason (eql :h)) sequencer)
 233   (with-slots ((class %class) chain-head chain-tail) ichain
 234     (when (eq class chain-tail)
 235       (sequence-output (stream sequencer)
 236         :constraint ((class :ichains :start)
 237                      (class :ichain chain-head :start)
 238                      (class :ichain chain-head :slots)
 239                      (class :ichain chain-head :end)
 240                      (class :ichains :end))
 241         ((class :ichain chain-head :start)
 242          (format stream "/* Instance chain structure. */~@
 243                          struct ~A {~%"
 244                  (ichain-struct-tag chain-tail chain-head)))
 245         ((class :ichain chain-head :end)
 246          (format stream "};~2%")
 247          (format stream "/* Union of equivalent superclass chains. */~@
 248                          union ~A {~@
 249                          ~:{  struct ~A ~A;~%~}~
 250                          };~2%"
 251                  (ichain-union-tag chain-tail chain-head)
 252
 253                  ;; Make sure the most specific class is first: only the
 254                  ;; first element of a union can be statically initialized in
 255                  ;; C90.
 256                  (mapcar (lambda (super)
 257                            (list (ichain-struct-tag super chain-head)
 258                                  (sod-class-nickname super)))
 259                          (sod-class-chain chain-tail))))))))
 260
 261 (defmethod hook-output progn
 262     ((ichain ichain) (reason (eql 'ilayout)) sequencer)
 263   (with-slots ((class %class) chain-head chain-tail) ichain
 264     (sequence-output (stream sequencer)
 265       ((class :ilayout :slots)
 266        (format stream "  union ~A ~A;~%"
 267                (ichain-union-tag chain-tail chain-head)
 268                (sod-class-nickname chain-head))))))
 269
 270 (defmethod hook-output progn ((vtptr vtable-pointer)
 271                               (reason (eql :h))
 272                               sequencer)
 273   (with-slots ((class %class) chain-head chain-tail) vtptr
 274     (when (eq class chain-tail)
 275       (sequence-output (stream sequencer)
 276         ((class :ichain chain-head :slots)
 277          (format stream "  const struct ~A *_vt;~%"
 278                  (vtable-struct-tag chain-tail chain-head)))))))
 279
 280 (defmethod hook-output progn ((islots islots) (reason (eql :h)) sequencer)
 281   (with-slots ((class %class) subclass slots) islots
 282     (let ((head (sod-class-chain-head class)))
 283       (when (eq head (sod-class-chain-head subclass))
 284         (sequence-output (stream sequencer)
 285           ((subclass :ichain (sod-class-chain-head class) :slots)
 286            (format stream "  struct ~A ~A;~%"
 287                    (islots-struct-tag class)
 288                    (sod-class-nickname class))))))))
 289
 290 ;;;--------------------------------------------------------------------------
 291 ;;; Vtable structure.
 292
 293 (defmethod hook-output progn
 294     ((method sod-method) (reason (eql :h)) sequencer)
 295   (with-slots ((class %class)) method
 296     (sequence-output (stream sequencer)
 297       ((class :methods)
 298        (let ((type (sod-method-function-type method)))
 299          (princ "extern " stream)
 300          (pprint-c-type (commentify-function-type type) stream
 301                         (sod-method-function-name method))
 302          (format stream ";~%")))
 303       ((class :methods :defs)
 304        (let* ((type (sod-method-type method))
 305               (keys (and (typep type 'c-keyword-function-type)
 306                          (c-function-keywords type))))
 307          (when keys
 308            (format stream "struct ~A {~%~
 309                            ~{  unsigned ~A: 1;~%~}~
 310                            };~2%"
 311                    (direct-method-suppliedp-struct-tag method)
 312                    (mapcar #'argument-name keys))))))))
 313
 314 (defmethod hook-output progn ((vtable vtable) (reason (eql :h)) sequencer)
 315   (with-slots ((class %class) chain-head chain-tail) vtable
 316     (when (eq class chain-tail)
 317       (sequence-output (stream sequencer)
 318         :constraint ((class :vtables :start)
 319                      (class :vtable chain-head :start)
 320                      (class :vtable chain-head :slots)
 321                      (class :vtable chain-head :end)
 322                      (class :vtables :end))
 323         ((class :vtable chain-head :start)
 324          (format stream "/* Vtable structure. */~@
 325                          struct ~A {~%"
 326                  (vtable-struct-tag chain-tail chain-head)))
 327         ((class :vtable chain-head :end)
 328          (format stream "};~2%")
 329          (format stream "/* Union of equivalent superclass vtables. */~@
 330                          union ~A {~@
 331                          ~:{  struct ~A ~A;~%~}~
 332                          };~2%"
 333                  (vtable-union-tag chain-tail chain-head)
 334
 335                  ;; As for the ichain union, make sure the most specific
 336                  ;; class is first.
 337                  (mapcar (lambda (super)
 338                            (list (vtable-struct-tag super chain-head)
 339                                  (sod-class-nickname super)))
 340                          (sod-class-chain chain-tail))))))
 341     (sequence-output (stream sequencer)
 342       ((class :vtable-externs)
 343        (format stream "~@<extern const union ~A ~2I~_~A;~:>~%"
 344                (vtable-union-tag chain-tail chain-head)
 345                (vtable-name class chain-head))))))
 346
 347 (defmethod hook-output progn ((vtmsgs vtmsgs) (reason (eql :h)) sequencer)
 348   (with-slots ((class %class) subclass chain-head chain-tail) vtmsgs
 349     (when (eq subclass chain-tail)
 350       (sequence-output (stream sequencer)
 351         ((subclass :vtable chain-head :slots)
 352          (format stream "  struct ~A ~A;~%"
 353                  (vtmsgs-struct-tag subclass class)
 354                  (sod-class-nickname class)))))))
 355
 356 (defmethod hook-output progn
 357     ((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 progn
 375     ((entry method-entry) (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 progn
 389     ((cptr class-pointer) (reason (eql :h)) sequencer)
 390   (with-slots ((class %class) chain-head metaclass meta-chain-head) cptr
 391     (when (eq chain-head (sod-class-chain-head class))
 392       (sequence-output (stream sequencer)
 393         ((class :vtable chain-head :slots)
 394          (format stream "  const ~A *~:[_class~;~:*_cls_~A~];~%"
 395                  metaclass
 396                  (and (sod-class-direct-superclasses meta-chain-head)
 397                       (sod-class-nickname meta-chain-head))))))))
 398
 399 (defmethod hook-output progn ((boff base-offset) (reason (eql :h)) sequencer)
 400   (with-slots ((class %class) chain-head) boff
 401     (when (eq chain-head (sod-class-chain-head class))
 402       (sequence-output (stream sequencer)
 403         ((class :vtable chain-head :slots)
 404          (write-line "  size_t _base;" stream))))))
 405
 406 (defmethod hook-output progn
 407     ((choff chain-offset) (reason (eql :h)) sequencer)
 408   (with-slots ((class %class) chain-head target-head) choff
 409     (when (eq chain-head (sod-class-chain-head class))
 410       (sequence-output (stream sequencer)
 411         ((class :vtable chain-head :slots)
 412          (format stream "  ptrdiff_t _off_~A;~%"
 413                  (sod-class-nickname target-head)))))))
 414
 415 ;;;--------------------------------------------------------------------------
 416 ;;; Implementation output.
 417
 418 (export '*instance-class*)
 419 (defvar *instance-class* nil
 420   "The class currently being output.
 421
 422    This is bound during the `hook-output' traversal of a class layout for
 423    `:c' output, since some of the objects traversed actually `belong' to
 424    superclasses and there's no other way to find out what the reference class
 425    actually is.
 426
 427    It may be bound at other times.")
 428
 429 (defmethod hook-output progn ((class sod-class) (reason (eql :c)) sequencer)
 430   (sequence-output (stream sequencer)
 431
 432     :constraint
 433     ((:classes :start)
 434      (class :banner)
 435      (class :direct-methods :start) (class :direct-methods :end)
 436      (class :effective-methods)
 437      (class :vtables :start) (class :vtables :end)
 438      (class :object :prepare) (class :object :start) (class :object :end)
 439      (:classes :end))
 440
 441     ((class :banner)
 442      (banner (format nil "Class ~A" class) stream))
 443
 444     ((class :object :start)
 445      (format stream "~
 446 /* The class object. */
 447 const struct ~A ~A__classobj = {~%"
 448              (ilayout-struct-tag (sod-class-metaclass class))
 449              class))
 450     ((class :object :end)
 451      (format stream "};~2%")))
 452
 453   (let ((*instance-class* class))
 454     (hook-output (sod-class-ilayout (sod-class-metaclass class))
 455                  'class sequencer)))
 456
 457 ;;;--------------------------------------------------------------------------
 458 ;;; Direct and effective methods.
 459
 460 (defmethod hook-output progn
 461     ((method delegating-direct-method) (reason (eql :c)) sequencer)
 462   (with-slots ((class %class) body) method
 463     (unless body
 464       (return-from hook-output))
 465     (sequence-output (stream sequencer)
 466       ((class :direct-method method :start)
 467        (format stream "#define CALL_NEXT_METHOD (next_method(~{~A~^, ~}))~%"
 468                (mapcar #'argument-name
 469                        (c-function-arguments (sod-method-next-method-type
 470                                               method)))))
 471       ((class :direct-method method :end)
 472        (format stream "#undef CALL_NEXT_METHOD~%")))))
 473
 474 (defmethod hook-output progn
 475     ((method sod-method) (reason (eql :c)) sequencer)
 476   (with-slots ((class %class) role body message) method
 477     (unless body
 478       (return-from hook-output))
 479     (sequence-output (stream sequencer)
 480       :constraint ((class :direct-methods :start)
 481                    (class :direct-method method :banner)
 482                    (class :direct-method method :start)
 483                    (class :direct-method method :body)
 484                    (class :direct-method method :end)
 485                    (class :direct-methods :end))
 486       ((class :direct-method method :banner)
 487        (format-banner-comment stream "Direct ~@[~(~A~) ~]method ~:_~
 488                                       on `~A.~A' ~:_defined by `~A'."
 489                               role
 490                               (sod-class-nickname
 491                                (sod-message-class message))
 492                               (sod-message-name message)
 493                               class)
 494        (fresh-line stream))
 495       ((class :direct-method method :body)
 496        (pprint-c-type (sod-method-function-type method)
 497                       stream
 498                       (sod-method-function-name method))
 499        (format stream "~&{~%")
 500        (write body :stream stream :pretty nil :escape nil)
 501        (format stream "~&}~%"))
 502       ((class :direct-method method :end)
 503        (terpri stream)))))
 504
 505 (defmethod hook-output progn
 506     ((method basic-effective-method) (reason (eql :c)) sequencer)
 507   (with-slots ((class %class) functions) method
 508     (sequence-output (stream sequencer)
 509       ((class :effective-methods)
 510        (let* ((keys (effective-method-keywords method))
 511               (message (effective-method-message method))
 512               (msg-class (sod-message-class message)))
 513          (when keys
 514            (format-banner-comment stream "Keyword argument structure ~:_~
 515                                           for `~A.~A' ~:_on class `~A'."
 516                                   (sod-class-nickname msg-class)
 517                                   (sod-message-name message)
 518                                   class)
 519            (format stream "~&struct ~A {~%"
 520                    (effective-method-keyword-struct-tag method))
 521            (format stream "~{  unsigned ~A__suppliedp: 1;~%~}"
 522                    (mapcar #'argument-name keys))
 523            (dolist (key keys)
 524              (write-string "  " stream)
 525              (pprint-c-type (argument-type key) stream (argument-name key))
 526              (format stream ";~%"))
 527            (format stream "};~2%")))
 528        (dolist (func functions)
 529          (write func :stream stream :escape nil :circle nil))))))
 530
 531 ;;;--------------------------------------------------------------------------
 532 ;;; Vtables.
 533
 534 (defmethod hook-output progn ((vtable vtable) (reason (eql :c)) sequencer)
 535   (with-slots ((class %class) chain-head chain-tail) vtable
 536     (sequence-output (stream sequencer)
 537       :constraint ((class :vtables :start)
 538                    (class :vtable chain-head :start)
 539                    (class :vtable chain-head :end)
 540                    (class :vtables :end))
 541       ((class :vtable chain-head :start)
 542        (format stream "/* Vtable for ~A chain. */~@
 543                        const union ~A ~A = { {~%"
 544                chain-head
 545                (vtable-union-tag chain-tail chain-head)
 546                (vtable-name class chain-head)))
 547       ((class :vtable chain-head :end)
 548        (format stream "} };~2%")))))
 549
 550 (defmethod hook-output progn
 551     ((cptr class-pointer) (reason (eql :c)) sequencer)
 552   (with-slots ((class %class) chain-head metaclass meta-chain-head) cptr
 553     (sequence-output (stream sequencer)
 554       :constraint ((class :vtable chain-head :start)
 555                    (class :vtable chain-head :class-pointer metaclass)
 556                    (class :vtable chain-head :end))
 557       ((class :vtable chain-head :class-pointer metaclass)
 558        (format stream "  /* ~21@A = */ &~A__classobj.~A.~A,~%"
 559                (if (sod-class-direct-superclasses meta-chain-head)
 560                    (format nil "_cls_~A"
 561                            (sod-class-nickname meta-chain-head))
 562                    "_class")
 563                class
 564                (sod-class-nickname meta-chain-head)
 565                (sod-class-nickname metaclass))))))
 566
 567 (defmethod hook-output progn ((boff base-offset) (reason (eql :c)) sequencer)
 568   (with-slots ((class %class) chain-head) boff
 569     (sequence-output (stream sequencer)
 570       :constraint ((class :vtable chain-head :start)
 571                    (class :vtable chain-head :base-offset)
 572                    (class :vtable chain-head :end))
 573       ((class :vtable chain-head :base-offset)
 574        (format stream "  /* ~21@A = */ offsetof(struct ~A, ~A),~%"
 575                "_base"
 576                (ilayout-struct-tag class)
 577                (sod-class-nickname chain-head))))))
 578
 579 (defmethod hook-output progn
 580     ((choff chain-offset) (reason (eql :c)) sequencer)
 581   (with-slots ((class %class) chain-head target-head) choff
 582     (sequence-output (stream sequencer)
 583       :constraint ((class :vtable chain-head :start)
 584                    (class :vtable chain-head :chain-offset target-head)
 585                    (class :vtable chain-head :end))
 586       ((class :vtable chain-head :chain-offset target-head)
 587        (format stream "  /* ~21@A = */ SOD_OFFSETDIFF(struct ~A, ~A, ~A),~%"
 588                (format nil "_off_~A" (sod-class-nickname target-head))
 589                (ilayout-struct-tag class)
 590                (sod-class-nickname chain-head)
 591                (sod-class-nickname target-head))))))
 592
 593 (defmethod hook-output progn ((vtmsgs vtmsgs) (reason (eql :c)) sequencer)
 594   (with-slots ((class %class) subclass chain-head) vtmsgs
 595     (sequence-output (stream sequencer)
 596       :constraint ((subclass :vtable chain-head :start)
 597                    (subclass :vtable chain-head :vtmsgs class :start)
 598                    (subclass :vtable chain-head :vtmsgs class :slots)
 599                    (subclass :vtable chain-head :vtmsgs class :end)
 600                    (subclass :vtable chain-head :end))
 601       ((subclass :vtable chain-head :vtmsgs class :start)
 602        (format stream "  { /* Method entries for ~A messages. */~%"
 603                class))
 604       ((subclass :vtable chain-head :vtmsgs class :end)
 605        (format stream "  },~%")))))
 606
 607 (defmethod hook-output progn
 608     ((entry method-entry) (reason (eql :c)) sequencer)
 609   (with-slots ((method %method) chain-head chain-tail role) entry
 610     (let* ((message (effective-method-message method))
 611            (class (effective-method-class method))
 612            (super (sod-message-class message)))
 613       (sequence-output (stream sequencer)
 614         ((class :vtable chain-head :vtmsgs super :slots)
 615          (format stream "    /* ~19@A = */ ~A,~%"
 616                  (method-entry-slot-name entry)
 617                  (method-entry-function-name method chain-head role)))))))
 618
 619 ;;;--------------------------------------------------------------------------
 620 ;;; Filling in the class object.
 621
 622 (defmethod hook-output progn
 623     ((ichain ichain) (reason (eql 'class)) sequencer)
 624   (with-slots ((class %class) chain-head) ichain
 625     (sequence-output (stream sequencer)
 626       :constraint ((*instance-class* :object :start)
 627                    (*instance-class* :object chain-head :ichain :start)
 628                    (*instance-class* :object chain-head :ichain :end)
 629                    (*instance-class* :object :end))
 630       ((*instance-class* :object chain-head :ichain :start)
 631        (format stream "  { { /* ~A ichain */~%"
 632                (sod-class-nickname chain-head)))
 633       ((*instance-class* :object chain-head :ichain :end)
 634        (format stream "  } },~%")))))
 635
 636 (defmethod hook-output progn
 637     ((islots islots) (reason (eql 'class)) sequencer)
 638   (with-slots ((class %class)) islots
 639     (let ((chain-head (sod-class-chain-head class)))
 640       (sequence-output (stream sequencer)
 641         :constraint ((*instance-class* :object chain-head :ichain :start)
 642                      (*instance-class* :object class :slots :start)
 643                      (*instance-class* :object class :slots)
 644                      (*instance-class* :object class :slots :end)
 645                      (*instance-class* :object chain-head :ichain :end))
 646         ((*instance-class* :object class :slots :start)
 647          (format stream "      { /* Class ~A */~%" class))
 648         ((*instance-class* :object class :slots :end)
 649          (format stream "      },~%"))))))
 650
 651 (defmethod hook-output progn
 652     ((vtptr vtable-pointer) (reason (eql 'class)) sequencer)
 653   (with-slots ((class %class) chain-head chain-tail) vtptr
 654     (sequence-output (stream sequencer)
 655       :constraint ((*instance-class* :object chain-head :ichain :start)
 656                    (*instance-class* :object chain-head :vtable)
 657                    (*instance-class* :object chain-head :ichain :end))
 658       ((*instance-class* :object chain-head :vtable)
 659        (format stream "      /* ~17@A = */ &~A.~A,~%"
 660                "_vt"
 661                (vtable-name class chain-head)
 662                (sod-class-nickname chain-tail))))))
 663
 664 (defgeneric output-class-initializer (slot instance stream)
 665   (:method ((slot sod-class-effective-slot) (instance sod-class) stream)
 666     (let ((func (effective-slot-initializer-function slot))
 667           (direct-slot (effective-slot-direct-slot slot)))
 668       (if func
 669           (format stream "        /* ~15@A = */ ~A,~%"
 670                   (sod-slot-name direct-slot)
 671                   (funcall func instance))
 672           (call-next-method))))
 673   (:method ((slot effective-slot) (instance sod-class) stream)
 674     (let ((init (find-class-initializer slot instance))
 675           (direct-slot (effective-slot-direct-slot slot)))
 676       (format stream "        /* ~15@A = */ ~A,~%"
 677               (sod-slot-name direct-slot)
 678               (sod-initializer-value init)))))
 679
 680 (defmethod hook-output progn
 681     ((slot sod-class-effective-slot) (reason (eql 'class)) sequencer)
 682   (let ((instance *instance-class*)
 683         (func (effective-slot-prepare-function slot)))
 684     (when func
 685       (sequence-output (stream sequencer)
 686         ((instance :object :prepare)
 687          (funcall func instance stream))))))
 688
 689 (defmethod hook-output progn
 690     ((slot effective-slot) (reason (eql 'class)) sequencer)
 691   (with-slots ((class %class) (dslot slot)) slot
 692     (let ((instance *instance-class*)
 693           (super (sod-slot-class dslot)))
 694       (sequence-output (stream sequencer)
 695         ((instance :object super :slots)
 696          (output-class-initializer slot instance stream))))))
 697
 698 ;;;----- That's all, folks --------------------------------------------------