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- ;;;; Copyright (C) 1999, 2001 Free Software Foundation, Inc.
- ;;;;
- ;;;; This program is free software; you can redistribute it and/or modify
- ;;;; it under the terms of the GNU General Public License as published by
- ;;;; the Free Software Foundation; either version 2, or (at your option)
- ;;;; any later version.
- ;;;;
- ;;;; This program is distributed in the hope that it will be useful,
- ;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
- ;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- ;;;; GNU General Public License for more details.
- ;;;;
- ;;;; You should have received a copy of the GNU General Public License
- ;;;; along with this software; see the file COPYING. If not, write to
- ;;;; the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
- ;;;; Boston, MA 02111-1307 USA
- ;;;;
- ;;;; As a special exception, the Free Software Foundation gives permission
- ;;;; for additional uses of the text contained in its release of GUILE.
- ;;;;
- ;;;; The exception is that, if you link the GUILE library with other files
- ;;;; to produce an executable, this does not by itself cause the
- ;;;; resulting executable to be covered by the GNU General Public License.
- ;;;; Your use of that executable is in no way restricted on account of
- ;;;; linking the GUILE library code into it.
- ;;;;
- ;;;; This exception does not however invalidate any other reasons why
- ;;;; the executable file might be covered by the GNU General Public License.
- ;;;;
- ;;;; This exception applies only to the code released by the
- ;;;; Free Software Foundation under the name GUILE. If you copy
- ;;;; code from other Free Software Foundation releases into a copy of
- ;;;; GUILE, as the General Public License permits, the exception does
- ;;;; not apply to the code that you add in this way. To avoid misleading
- ;;;; anyone as to the status of such modified files, you must delete
- ;;;; this exception notice from them.
- ;;;;
- ;;;; If you write modifications of your own for GUILE, it is your choice
- ;;;; whether to permit this exception to apply to your modifications.
- ;;;; If you do not wish that, delete this exception notice.
- ;;;;
-
-
- (define-module (oop goops compile)
- :use-module (oop goops)
- :use-module (oop goops util)
- :export (compute-cmethod compute-entry-with-cmethod
- compile-method cmethod-code cmethod-environment)
- :no-backtrace
- )
-
- (define source-formals cadr)
- (define source-body cddr)
-
- (define cmethod-code cdr)
- (define cmethod-environment car)
-
-
- ;;;
- ;;; Method entries
- ;;;
-
- (define code-table-lookup
- (letrec ((check-entry (lambda (entry types)
- (if (null? types)
- (and (not (struct? (car entry)))
- entry)
- (and (eq? (car entry) (car types))
- (check-entry (cdr entry) (cdr types)))))))
- (lambda (code-table types)
- (cond ((null? code-table) #f)
- ((check-entry (car code-table) types)
- => (lambda (cmethod)
- (cons (car code-table) cmethod)))
- (else (code-table-lookup (cdr code-table) types))))))
-
- (define (compute-entry-with-cmethod methods types)
- (or (code-table-lookup (slot-ref (car methods) 'code-table) types)
- (let* ((method (car methods))
- (place-holder (list #f))
- (entry (append types place-holder)))
- ;; In order to handle recursion nicely, put the entry
- ;; into the code-table before compiling the method
- (slot-set! (car methods) 'code-table
- (cons entry (slot-ref (car methods) 'code-table)))
- (let ((cmethod (compile-method methods types)))
- (set-car! place-holder (car cmethod))
- (set-cdr! place-holder (cdr cmethod)))
- (cons entry place-holder))))
-
- (define (compute-cmethod methods types)
- (cdr (compute-entry-with-cmethod methods types)))
-
- ;;;
- ;;; Next methods
- ;;;
-
- ;;; Temporary solution---return #f if x doesn't refer to `next-method'.
- (define (next-method? x)
- (and (pair? x)
- (or (eq? (car x) 'next-method)
- (next-method? (car x))
- (next-method? (cdr x)))))
-
- (define (make-final-make-next-method method)
- (lambda default-args
- (lambda args
- (@apply method (if (null? args) default-args args)))))
-
- (define (make-final-make-no-next-method gf)
- (lambda default-args
- (lambda args
- (no-next-method gf (if (null? args) default-args args)))))
-
- (define (make-make-next-method vcell gf methods types)
- (lambda default-args
- (lambda args
- (if (null? methods)
- (begin
- (set-cdr! vcell (make-final-make-no-next-method gf))
- (no-next-method gf (if (null? args) default-args args)))
- (let* ((cmethod (compute-cmethod methods types))
- (method (local-eval (cons 'lambda (cmethod-code cmethod))
- (cmethod-environment cmethod))))
- (set-cdr! vcell (make-final-make-next-method method))
- (@apply method (if (null? args) default-args args)))))))
-
- ;;;
- ;;; Method compilation
- ;;;
-
- ;;; NOTE: This section is far from finished. It will finally be
- ;;; implemented on C level.
-
- (define %tag-body
- (nested-ref the-root-module '(app modules oop goops %tag-body)))
-
- (define (compile-method methods types)
- (let* ((proc (method-procedure (car methods)))
- ;; XXX - procedure-source can not be guaranteed to be
- ;; reliable or efficient
- (src (procedure-source proc))
- (formals (source-formals src))
- (body (source-body src)))
- (if (next-method? body)
- (let ((vcell (cons 'goops:make-next-method #f)))
- (set-cdr! vcell
- (make-make-next-method
- vcell
- (method-generic-function (car methods))
- (cdr methods) types))
- ;;*fixme*
- `(,(cons vcell (procedure-environment proc))
- ,formals
- ;;*fixme* Only do this on source where next-method can't be inlined
- (let ((next-method ,(if (list? formals)
- `(goops:make-next-method ,@formals)
- `(apply goops:make-next-method
- ,@(improper->proper formals)))))
- ,@body)))
- (cons (procedure-environment proc)
- (cons formals
- (%tag-body body)))
- )))
-