--- /dev/null	2017-01-22 10:16:57.869617664 -0800
+++ new/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/GuardNode.java	2017-02-15 17:06:41.682766155 -0800
@@ -0,0 +1,154 @@
+/*
+ * Copyright (c) 2011, 2014, 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;
+
+import static org.graalvm.compiler.nodeinfo.InputType.Condition;
+import static org.graalvm.compiler.nodeinfo.InputType.Guard;
+import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_2;
+import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_2;
+
+import org.graalvm.compiler.core.common.type.StampFactory;
+import org.graalvm.compiler.graph.Node;
+import org.graalvm.compiler.graph.NodeClass;
+import org.graalvm.compiler.graph.spi.Canonicalizable;
+import org.graalvm.compiler.graph.spi.CanonicalizerTool;
+import org.graalvm.compiler.nodeinfo.NodeInfo;
+import org.graalvm.compiler.nodeinfo.Verbosity;
+import org.graalvm.compiler.nodes.extended.AnchoringNode;
+import org.graalvm.compiler.nodes.extended.GuardingNode;
+
+import jdk.vm.ci.meta.DeoptimizationAction;
+import jdk.vm.ci.meta.DeoptimizationReason;
+import jdk.vm.ci.meta.JavaConstant;
+
+/**
+ * A guard is a node that deoptimizes based on a conditional expression. Guards are not attached to
+ * a certain frame state, they can move around freely and will always use the correct frame state
+ * when the nodes are scheduled (i.e., the last emitted frame state). The node that is guarded has a
+ * data dependency on the guard and the guard in turn has a data dependency on the condition. A
+ * guard may only be executed if it is guaranteed that the guarded node is executed too (if no
+ * exceptions are thrown). Therefore, an anchor is placed after a control flow split and the guard
+ * has a data dependency to the anchor. The anchor is the most distant node that is post-dominated
+ * by the guarded node and the guard can be scheduled anywhere between those two nodes. This ensures
+ * maximum flexibility for the guard node and guarantees that deoptimization occurs only if the
+ * control flow would have reached the guarded node (without taking exceptions into account).
+ */
+@NodeInfo(nameTemplate = "Guard(!={p#negated}) {p#reason/s}", allowedUsageTypes = {Guard}, size = SIZE_2, cycles = CYCLES_2)
+public class GuardNode extends FloatingAnchoredNode implements Canonicalizable, GuardingNode, DeoptimizingGuard {
+
+    public static final NodeClass<GuardNode> TYPE = NodeClass.create(GuardNode.class);
+    @Input(Condition) protected LogicNode condition;
+    protected final DeoptimizationReason reason;
+    protected JavaConstant speculation;
+    protected DeoptimizationAction action;
+    protected boolean negated;
+
+    public GuardNode(LogicNode condition, AnchoringNode anchor, DeoptimizationReason reason, DeoptimizationAction action, boolean negated, JavaConstant speculation) {
+        this(TYPE, condition, anchor, reason, action, negated, speculation);
+    }
+
+    protected GuardNode(NodeClass<? extends GuardNode> c, LogicNode condition, AnchoringNode anchor, DeoptimizationReason reason, DeoptimizationAction action, boolean negated,
+                    JavaConstant speculation) {
+        super(c, StampFactory.forVoid(), anchor);
+        this.condition = condition;
+        this.reason = reason;
+        this.action = action;
+        this.negated = negated;
+        this.speculation = speculation;
+    }
+
+    /**
+     * The instruction that produces the tested boolean value.
+     */
+    @Override
+    public LogicNode getCondition() {
+        return condition;
+    }
+
+    @Override
+    public void setCondition(LogicNode x, boolean negated) {
+        updateUsages(condition, x);
+        condition = x;
+        this.negated = negated;
+    }
+
+    @Override
+    public boolean isNegated() {
+        return negated;
+    }
+
+    @Override
+    public DeoptimizationReason getReason() {
+        return reason;
+    }
+
+    @Override
+    public DeoptimizationAction getAction() {
+        return action;
+    }
+
+    @Override
+    public JavaConstant getSpeculation() {
+        return speculation;
+    }
+
+    public void setSpeculation(JavaConstant speculation) {
+        this.speculation = speculation;
+    }
+
+    @Override
+    public String toString(Verbosity verbosity) {
+        if (verbosity == Verbosity.Name && negated) {
+            return "!" + super.toString(verbosity);
+        } else {
+            return super.toString(verbosity);
+        }
+    }
+
+    @Override
+    public Node canonical(CanonicalizerTool tool) {
+        if (getCondition() instanceof LogicNegationNode) {
+            LogicNegationNode negation = (LogicNegationNode) getCondition();
+            return new GuardNode(negation.getValue(), getAnchor(), reason, action, !negated, speculation);
+        }
+        if (getCondition() instanceof LogicConstantNode) {
+            LogicConstantNode c = (LogicConstantNode) getCondition();
+            if (c.getValue() != negated) {
+                return null;
+            }
+        }
+        return this;
+    }
+
+    public FixedWithNextNode lowerGuard() {
+        return null;
+    }
+
+    public void negate() {
+        negated = !negated;
+    }
+
+    public void setAction(DeoptimizationAction invalidaterecompile) {
+        this.action = invalidaterecompile;
+    }
+}