--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/vm/gc_implementation/g1/heapRegionSeq.inline.hpp	Thu Jun 05 15:57:56 2008 -0700
@@ -0,0 +1,40 @@
+/*
+ * Copyright 2001-2007 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code 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
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+inline HeapRegion* HeapRegionSeq::addr_to_region(const void* addr) {
+  assert(_seq_bottom != NULL, "bad _seq_bottom in addr_to_region");
+  if ((char*) addr >= _seq_bottom) {
+    size_t diff = (size_t) pointer_delta((HeapWord*) addr,
+                                         (HeapWord*) _seq_bottom);
+    int index = (int) (diff >> HeapRegion::LogOfHRGrainWords);
+    assert(index >= 0, "invariant / paranoia");
+    if (index < _regions.length()) {
+      HeapRegion* hr = _regions.at(index);
+      assert(hr->is_in_reserved(addr),
+             "addr_to_region is wrong...");
+      return hr;
+    }
+  }
+  return NULL;
+}