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139 lines
4.5 KiB
Scheme
139 lines
4.5 KiB
Scheme
;;;; Copyright (C) 1999, 2001, 2006 Free Software Foundation, Inc.
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;;;;
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;;;; This library is free software; you can redistribute it and/or
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;;;; modify it under the terms of the GNU Lesser General Public
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;;;; License as published by the Free Software Foundation; either
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;;;; version 2.1 of the License, or (at your option) any later version.
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;;;;
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;;;; This library is distributed in the hope that it will be useful,
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;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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;;;; Lesser General Public License for more details.
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;;;;
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;;;; You should have received a copy of the GNU Lesser General Public
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;;;; License along with this library; if not, write to the Free Software
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;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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;;;;
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(define-module (oop goops compile)
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:use-module (oop goops)
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:use-module (oop goops util)
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:export (compute-cmethod compute-entry-with-cmethod
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compile-method cmethod-code cmethod-environment)
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:no-backtrace
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)
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(define source-formals cadr)
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(define source-body cddr)
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(define cmethod-code cdr)
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(define cmethod-environment car)
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;;;
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;;; Method entries
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;;;
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(define code-table-lookup
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(letrec ((check-entry (lambda (entry types)
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(if (null? types)
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(and (not (struct? (car entry)))
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entry)
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(and (eq? (car entry) (car types))
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(check-entry (cdr entry) (cdr types)))))))
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(lambda (code-table types)
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(cond ((null? code-table) #f)
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((check-entry (car code-table) types)
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=> (lambda (cmethod)
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(cons (car code-table) cmethod)))
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(else (code-table-lookup (cdr code-table) types))))))
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(define (compute-entry-with-cmethod methods types)
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(or (code-table-lookup (slot-ref (car methods) 'code-table) types)
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(let* ((method (car methods))
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(place-holder (list #f))
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(entry (append types place-holder)))
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;; In order to handle recursion nicely, put the entry
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;; into the code-table before compiling the method
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(slot-set! (car methods) 'code-table
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(cons entry (slot-ref (car methods) 'code-table)))
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(let ((cmethod (compile-method methods types)))
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(set-car! place-holder (car cmethod))
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(set-cdr! place-holder (cdr cmethod)))
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(cons entry place-holder))))
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(define (compute-cmethod methods types)
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(cdr (compute-entry-with-cmethod methods types)))
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;;;
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;;; Next methods
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;;;
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;;; Temporary solution---return #f if x doesn't refer to `next-method'.
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(define (next-method? x)
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(and (pair? x)
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(or (eq? (car x) 'next-method)
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(next-method? (car x))
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(next-method? (cdr x)))))
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(define (make-final-make-next-method method)
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(lambda default-args
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(lambda args
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(@apply method (if (null? args) default-args args)))))
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(define (make-final-make-no-next-method gf)
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(lambda default-args
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(lambda args
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(no-next-method gf (if (null? args) default-args args)))))
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(define (make-make-next-method vcell gf methods types)
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(lambda default-args
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(lambda args
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(if (null? methods)
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(begin
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(set-cdr! vcell (make-final-make-no-next-method gf))
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(no-next-method gf (if (null? args) default-args args)))
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(let* ((cmethod (compute-cmethod methods types))
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(method (local-eval (cons 'lambda (cmethod-code cmethod))
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(cmethod-environment cmethod))))
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(set-cdr! vcell (make-final-make-next-method method))
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(@apply method (if (null? args) default-args args)))))))
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;;;
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;;; Method compilation
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;;;
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;;; NOTE: This section is far from finished. It will finally be
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;;; implemented on C level.
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(define %tag-body
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(nested-ref the-root-module '(app modules oop goops %tag-body)))
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(define (compile-method methods types)
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(let* ((proc (method-procedure (car methods)))
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;; XXX - procedure-source can not be guaranteed to be
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;; reliable or efficient
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(src (procedure-source proc))
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(formals (source-formals src))
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(body (source-body src)))
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(if (next-method? body)
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(let ((vcell (cons 'goops:make-next-method #f)))
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(set-cdr! vcell
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(make-make-next-method
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vcell
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(method-generic-function (car methods))
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(cdr methods) types))
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;;*fixme*
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`(,(cons vcell (procedure-environment proc))
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,formals
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;;*fixme* Only do this on source where next-method can't be inlined
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(let ((next-method ,(if (list? formals)
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`(goops:make-next-method ,@formals)
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`(apply goops:make-next-method
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,@(improper->proper formals)))))
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,@body)))
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(cons (procedure-environment proc)
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(cons formals
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(%tag-body body)))
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)))
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