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+#| -*-Scheme-*-
+
+$Header: /Users/cph/tmp/foo/mit-scheme/mit-scheme/v7/src/compiler/rtlbase/rgraph.scm,v 1.1 1987/08/07 17:06:12 cph Exp $
+
+Copyright (c) 1987 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. |#
+
+;;;; Program Graph Abstraction
+
+(declare (usual-integrations))
+\f
+(define-vector-slots rgraph 0
+  edge
+  n-registers
+  continuations
+  bblocks
+  register-bblock
+  register-n-refs
+  register-n-deaths
+  register-live-length
+  register-crosses-call?
+  )
+(define-integrable rgraph-register-renumber rgraph-register-bblock)
+(define-integrable set-rgraph-register-renumber! set-rgraph-register-bblock!)
+(define *rgraphs*)
+(define *current-rgraph*)
+
+(define (rgraph-allocate)
+  (make-vector 10 false))
+
+(define (rgraph-entry-edges rgraph)
+  (cons (rgraph-edge rgraph)
+       (map continuation-rtl-edge (rgraph-continuations rgraph))))
+
+(define (rgraph-initial-edges rgraph)
+  (cons (rgraph-edge rgraph)
+       (let loop ((continuations (rgraph-continuations rgraph)))
+         (if (null? continuations)
+             '()
+             (let ((edge (continuation-rtl-edge (car continuations))))
+               (if (node-previous=0? (edge-right-node edge))
+                   (cons edge (loop (cdr continuations)))
+                   (loop (cdr continuations))))))))
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