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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
;;;;
(define-module (oop goops compile)
:use-module (oop goops)
:use-module (oop goops util)
:no-backtrace
)
(export compute-cmethod compute-entry-with-cmethod
compile-method cmethod-code cmethod-environment)
(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)))
(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)))
)))
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