--- a/src/share/vm/opto/memnode.cpp	Tue Nov 30 23:14:25 2010 -0800
+++ b/src/share/vm/opto/memnode.cpp	Wed Dec 01 10:16:31 2010 -0800
@@ -3599,10 +3599,12 @@
     intptr_t size_limit = phase->find_intptr_t_con(size_in_bytes, max_jint);
     if (zeroes_done + BytesPerLong >= size_limit) {
       assert(allocation() != NULL, "");
-      Node* klass_node = allocation()->in(AllocateNode::KlassNode);
-      ciKlass* k = phase->type(klass_node)->is_klassptr()->klass();
-      if (zeroes_done == k->layout_helper())
-        zeroes_done = size_limit;
+      if (allocation()->Opcode() == Op_Allocate) {
+        Node* klass_node = allocation()->in(AllocateNode::KlassNode);
+        ciKlass* k = phase->type(klass_node)->is_klassptr()->klass();
+        if (zeroes_done == k->layout_helper())
+          zeroes_done = size_limit;
+      }
     }
     if (zeroes_done < size_limit) {
       rawmem = ClearArrayNode::clear_memory(rawctl, rawmem, rawptr,

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/compiler/7002666/Test7002666.java	Wed Dec 01 10:16:31 2010 -0800
@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2010, 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.
+ *
+ */
+
+/**
+ * @test
+ * @bug 7002666
+ * @summary eclipse CDT projects crash with compressed oops
+ *
+ * @run main/othervm -Xbatch -XX:CompileOnly=Test7002666.test,java/lang/reflect/Array Test7002666
+ *
+ * This will only reliably fail with a fastdebug build since it relies
+ * on seeing garbage in the heap to die.  It could be made more
+ * reliable in product mode but that would require greatly increasing
+ * the runtime.
+ */
+
+public class Test7002666 {
+    public static void main(String[] args) {
+        for (int i = 0; i < 25000; i++) {
+            Object[] a = test(Test7002666.class, new Test7002666());
+            if (a[0] != null) {
+                // The element should be null but if it's not then
+                // we've hit the bug.  This will most likely crash but
+                // at least throw an exception.
+                System.err.println(a[0]);
+                throw new InternalError(a[0].toString());
+
+            }
+        }
+    }
+    public static Object[] test(Class c, Object o) {
+        // allocate an array small enough to be trigger the bug
+        Object[] a = (Object[])java.lang.reflect.Array.newInstance(c, 1);
+        return a;
+    }
+}