| 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 -------------------------------------------------- |