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