Spaces:
Sleeping
Sleeping
File size: 4,567 Bytes
f65fe85 |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 |
;;;; Copyright (C) 1999, 2001, 2006 Free Software Foundation, Inc.
;;;;
;;;; This library is free software; you can redistribute it and/or
;;;; modify it under the terms of the GNU Lesser General Public
;;;; License as published by the Free Software Foundation; either
;;;; version 2.1 of the License, or (at your option) any later version.
;;;;
;;;; This library 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
;;;; Lesser General Public License for more details.
;;;;
;;;; You should have received a copy of the GNU Lesser General Public
;;;; License along with this library; if not, write to the Free Software
;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
;;;;
(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)))
)))
|