#| -*-Scheme-*-

$Id: rules4.scm,v 1.8 2007/01/05 21:19:20 cph Exp $

Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
    1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
    2006, 2007 Massachusetts Institute of Technology

This file is part of MIT/GNU Scheme.

MIT/GNU Scheme 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 of the License, or (at
your option) any later version.

MIT/GNU Scheme 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 MIT/GNU Scheme; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301,
USA.

|#

;;;; LAP Generation Rules: Interpreter Calls
;; Package: (compiler lap-syntaxer)

(declare (usual-integrations))

;;;; Variable cache trap handling.

(define-rule statement
  (INTERPRETER-CALL:CACHE-REFERENCE (? cont)
				    (REGISTER (? extension))
				    (? safe?))
  cont					; ignored
  (LAP ,@(load-interface-args! false extension false false)
       ,@(link-to-interface
	  (if safe?
	      code:compiler-safe-reference-trap
	      code:compiler-reference-trap))))

(define-rule statement
  (INTERPRETER-CALL:CACHE-ASSIGNMENT (? cont)
				     (REGISTER (? extension))
				     (? value register-expression))
  cont					; ignored
  (LAP ,@(load-interface-args! false extension value false)
       ,@(link-to-interface code:compiler-assignment-trap)))

(define-rule statement
  (INTERPRETER-CALL:CACHE-UNASSIGNED? (? cont)
				      (REGISTER (? extension)))
  cont					; ignored
  (LAP ,@(load-interface-args! false extension false false)
       ,@(link-to-interface code:compiler-unassigned?-trap)))

;;;; Interpreter Calls

;;; All the code that follows is obsolete.  It hasn't been used in a while.
;;; It is provided in case the relevant switches are turned off, but there
;;; is no real reason to do this.  Perhaps the switches should be removed.

(define-rule statement
  (INTERPRETER-CALL:ACCESS (? cont)
			   (? environment register-expression)
			   (? name))
  cont					; ignored
  (lookup-call code:compiler-access environment name))

(define-rule statement
  (INTERPRETER-CALL:LOOKUP (? cont)
			   (? environment register-expression)
			   (? name)
			   (? safe?))
  cont					; ignored
  (lookup-call (if safe? code:compiler-safe-lookup code:compiler-lookup)
	       environment
	       name))

(define-rule statement
  (INTERPRETER-CALL:UNASSIGNED? (? cont)
				(? environment register-expression)
				(? name))
  cont					; ignored
  (lookup-call code:compiler-unassigned? environment name))

(define-rule statement
  (INTERPRETER-CALL:UNBOUND? (? cont)
			     (? environment register-expression)
			     (? name))
  cont					; ignored
  (lookup-call code:compiler-unbound? environment name))

(define (lookup-call code environment name)
  (LAP ,@(load-interface-args! false environment false false)
       ,@(load-constant regnum:third-arg name #F)
       ,@(link-to-interface code)))

(define-rule statement
  (INTERPRETER-CALL:DEFINE (? cont)
			   (? environment register-expression)
			   (? name)
			   (? value register-expression))
  cont					; ignored
  (assignment-call code:compiler-define environment name value))

(define-rule statement
  (INTERPRETER-CALL:SET! (? cont)
			 (? environment register-expression)
			 (? name)
			 (? value register-expression))
  cont					; ignored
  (assignment-call code:compiler-set! environment name value))

(define (assignment-call code environment name value)
  (LAP ,@(load-interface-args! false environment false value)
       ,@(load-constant regnum:third-arg name #F #F)
       ,@(link-to-interface code)))