--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/gc/parallel/objectStartArray.inline.hpp	Mon Jan 18 10:25:41 2016 +0100
@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2016, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#ifndef SHARE_VM_GC_PARALLEL_OBJECTSTARTARRAY_INLINE_HPP
+#define SHARE_VM_GC_PARALLEL_OBJECTSTARTARRAY_INLINE_HPP
+
+#include "gc/parallel/objectStartArray.hpp"
+
+// Optimized for finding the first object that crosses into
+// a given block. The blocks contain the offset of the last
+// object in that block. Scroll backwards by one, and the first
+// object hit should be at the beginning of the block
+HeapWord* ObjectStartArray::object_start(HeapWord* addr) const {
+  assert_covered_region_contains(addr);
+  jbyte* block = block_for_addr(addr);
+  HeapWord* scroll_forward = offset_addr_for_block(block--);
+  while (scroll_forward > addr) {
+    scroll_forward = offset_addr_for_block(block--);
+  }
+
+  HeapWord* next = scroll_forward;
+  while (next <= addr) {
+    scroll_forward = next;
+    next += oop(next)->size();
+  }
+  assert(scroll_forward <= addr, "wrong order for current and arg");
+  assert(addr <= next, "wrong order for arg and next");
+  return scroll_forward;
+}
+
+
+#endif // SHARE_VM_GC_PARALLEL_OBJECTSTARTARRAY_INLINE_HPP