mdw@git.distorted.org.uk Git - sod/blob - pre-reorg/class-layout.lisp

   1 ;;; -*-lisp-*-
   2 ;;;
   3 ;;; Layout for instances and vtables
   4 ;;;
   5 ;;; (c) 2009 Straylight/Edgeware
   6 ;;;
   7
   8 ;;;----- Licensing notice ---------------------------------------------------
   9 ;;;
  10 ;;; This file is part of the Simple Object Definition system.
  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 ;;; Effective slot objects.
  30
  31 (defclass effective-slot ()
  32   ((class :initarg :class :type sod-slot :reader effective-slot-class)
  33    (slot :initarg :slot :type sod-slot :reader effective-slot-direct-slot)
  34    (initializer :initarg :initializer :type (or sod-initializer null)
  35                 :reader effective-slot-initializer))
  36   (:documentation
  37    "Describes a slot and how it's meant to be initialized.
  38
  39    Effective slot objects are usually attached to layouts."))
  40
  41 (defgeneric find-slot-initializer (class slot)
  42   (:documentation
  43    "Return the most specific initializer for SLOT, starting from CLASS."))
  44
  45 (defgeneric compute-effective-slot (class slot)
  46   (:documentation
  47    "Construct an effective slot from the supplied direct slot.
  48
  49    SLOT is a direct slot defined on CLASS or one of its superclasses.
  50    (Metaclass initializers are handled using a different mechanism.)"))
  51
  52 ;;;--------------------------------------------------------------------------
  53 ;;; Instance layout objects.
  54
  55 (defclass islots ()
  56   ((class :initarg :class :type sod-class :reader islots-class)
  57    (subclass :initarg :subclass :type sod-class :reader islots-subclass)
  58    (slots :initarg :slots :type list :reader islots-slots))
  59   (:documentation
  60    "The collection of effective SLOTS defined by an instance of CLASS."))
  61
  62 ;;; Standard implementation.
  63
  64 ;;;--------------------------------------------------------------------------
  65 ;;; Effective methods.
  66
  67 ;;;--------------------------------------------------------------------------
  68 ;;; Vtable layout.
  69
  70 ;;; vtmsgs
  71
  72 ;;; base-offset
  73
  74 ;;; chain-offset
  75
  76 ;;; vtable
  77
  78 ;;; Implementation.
  79
  80 ;;;----- That's all, folks --------------------------------------------------