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    Length: 2649 (0xa59)
    Types: TextFile
    Names: »link.scm.1«

└─⟦a0efdde77⟧ Bits:30001252 EUUGD11 Tape, 1987 Spring Conference Helsinki
    └─⟦this⟧ »EUUGD11/gnu-31mar87/scheme/scm/link.scm.1« 

TextFile

;;; -*-Scheme-*-
;;;
;;;	Copyright (c) 1984 Massachusetts Institute of Technology
;;;
;;;	This material was developed by the Scheme project at the
;;;	Massachusetts Institute of Technology, Department of
;;;	Electrical Engineering and Computer Science.  Permission to
;;;	copy this software, to redistribute it, and to use it for any
;;;	purpose is granted, subject to the following restrictions and
;;;	understandings.
;;;
;;;	1. Any copy made of this software must include this copyright
;;;	notice in full.
;;;
;;;	2. Users of this software agree to make their best efforts (a)
;;;	to return to the MIT Scheme project any improvements or
;;;	extensions that they make, so that these may be included in
;;;	future releases; and (b) to inform MIT of noteworthy uses of
;;;	this software.
;;;
;;;	3.  All materials developed as a consequence of the use of
;;;	this software shall duly acknowledge such use, in accordance
;;;	with the usual standards of acknowledging credit in academic
;;;	research.
;;;
;;;	4. MIT has made no warrantee or representation that the
;;;	operation of this software will be error-free, and MIT is
;;;	under no obligation to provide any services, by way of
;;;	maintenance, update, or otherwise.
;;;
;;;	5.  In conjunction with products arising from the use of this
;;;	material, there shall be no use of the name of the
;;;	Massachusetts Institute of Technology nor of any adaptation
;;;	thereof in any advertising, promotional, or sales literature
;;;	without prior written consent from MIT in each case.
;;;

(declare
 (USUAL-INTEGRATIONS)
 (COMPILABLE-PRIMITIVE-FUNCTIONS
  primitive-set-type
  make-non-pointer-object
  primitive-datum
  (get-first-constant-address get-next-constant)
  )
 )

(define link
  (let ((compiled-entry-type-code (microcode-type 'COMPILED-EXPRESSION)))
    (named-lambda (link code-vector main-entry-offset objects-to-link)
      (define (make-entry offset address)
	(primitive-set-type compiled-entry-type-code
			    (make-non-pointer-object (+ offset address))))
      (if (null? objects-to-link)
	  (make-entry main-entry-offset (primitive-datum (purify code-vector)))
	  (without-interrupts
	   (lambda ()
	     (let ((address (primitive-datum (get-first-constant-address))))
	       
	       (mapc (lambda (info)
		       (set-lambda-body! (cadr info)
					 (make-entry (car info) address)))
		objects-to-link)

	       (purify code-vector)
	       
	       (if (not (= address (primitive-datum code-vector)))
		   (error "Link error.  Absolute addresses incorrectly linked"
			  address (primitive-datum code-vector)))
	       
	       (make-entry main-entry-offset address))))))))