--- /dev/null	2016-05-31 09:42:47.975716356 -0700
+++ new/src/jdk.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/spi/LoweringTool.java	2016-12-09 00:56:00.022535356 -0800
@@ -0,0 +1,85 @@
+/*
+ * Copyright (c) 2011, 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.
+ */
+package org.graalvm.compiler.nodes.spi;
+
+import org.graalvm.compiler.core.common.spi.ConstantFieldProvider;
+import org.graalvm.compiler.nodes.FixedNode;
+import org.graalvm.compiler.nodes.FixedWithNextNode;
+import org.graalvm.compiler.nodes.LogicNode;
+import org.graalvm.compiler.nodes.extended.AnchoringNode;
+import org.graalvm.compiler.nodes.extended.GuardingNode;
+
+import jdk.vm.ci.meta.ConstantReflectionProvider;
+import jdk.vm.ci.meta.DeoptimizationAction;
+import jdk.vm.ci.meta.DeoptimizationReason;
+import jdk.vm.ci.meta.JavaConstant;
+import jdk.vm.ci.meta.MetaAccessProvider;
+
+public interface LoweringTool {
+
+    MetaAccessProvider getMetaAccess();
+
+    LoweringProvider getLowerer();
+
+    ConstantReflectionProvider getConstantReflection();
+
+    ConstantFieldProvider getConstantFieldProvider();
+
+    Replacements getReplacements();
+
+    StampProvider getStampProvider();
+
+    NodeCostProvider getNodeCostProvider();
+
+    GuardingNode createGuard(FixedNode before, LogicNode condition, DeoptimizationReason deoptReason, DeoptimizationAction action);
+
+    GuardingNode createGuard(FixedNode before, LogicNode condition, DeoptimizationReason deoptReason, DeoptimizationAction action, JavaConstant speculation, boolean negated);
+
+    /**
+     * Gets the closest fixed node preceding the node currently being lowered.
+     */
+    FixedWithNextNode lastFixedNode();
+
+    AnchoringNode getCurrentGuardAnchor();
+
+    /**
+     * Marker interface lowering stages.
+     */
+    interface LoweringStage {
+    }
+
+    /**
+     * The lowering stages used in a standard Graal phase plan. Lowering is called 3 times, during
+     * every tier of compilation.
+     */
+    enum StandardLoweringStage implements LoweringStage {
+        HIGH_TIER,
+        MID_TIER,
+        LOW_TIER
+    }
+
+    /**
+     * Returns current lowering stage.
+     */
+    LoweringStage getLoweringStage();
+}