--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.virtual/src/org/graalvm/compiler/virtual/phases/ea/EffectsPhase.java	Thu Feb 16 15:46:09 2017 -0800
@@ -0,0 +1,135 @@
+/*
+ * Copyright (c) 2011, 2012, 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.virtual.phases.ea;
+
+import static org.graalvm.compiler.debug.Debug.isEnabled;
+import static org.graalvm.compiler.phases.common.DeadCodeEliminationPhase.Optionality.Required;
+
+import java.util.Set;
+
+import org.graalvm.compiler.core.common.util.CompilationAlarm;
+import org.graalvm.compiler.debug.Debug;
+import org.graalvm.compiler.debug.Debug.Scope;
+import org.graalvm.compiler.graph.Graph.NodeEventScope;
+import org.graalvm.compiler.graph.Node;
+import org.graalvm.compiler.graph.spi.Simplifiable;
+import org.graalvm.compiler.nodes.StructuredGraph;
+import org.graalvm.compiler.nodes.StructuredGraph.ScheduleResult;
+import org.graalvm.compiler.nodes.cfg.ControlFlowGraph;
+import org.graalvm.compiler.phases.BasePhase;
+import org.graalvm.compiler.phases.common.CanonicalizerPhase;
+import org.graalvm.compiler.phases.common.DeadCodeEliminationPhase;
+import org.graalvm.compiler.phases.common.util.HashSetNodeEventListener;
+import org.graalvm.compiler.phases.graph.ReentrantBlockIterator;
+import org.graalvm.compiler.phases.schedule.SchedulePhase;
+import org.graalvm.compiler.phases.tiers.PhaseContext;
+
+public abstract class EffectsPhase<PhaseContextT extends PhaseContext> extends BasePhase<PhaseContextT> {
+
+    public abstract static class Closure<T> extends ReentrantBlockIterator.BlockIteratorClosure<T> {
+
+        public abstract boolean hasChanged();
+
+        public abstract void applyEffects();
+    }
+
+    private final int maxIterations;
+    protected final CanonicalizerPhase canonicalizer;
+    private final boolean unscheduled;
+
+    protected EffectsPhase(int maxIterations, CanonicalizerPhase canonicalizer) {
+        this(maxIterations, canonicalizer, false);
+    }
+
+    protected EffectsPhase(int maxIterations, CanonicalizerPhase canonicalizer, boolean unscheduled) {
+        this.maxIterations = maxIterations;
+        this.canonicalizer = canonicalizer;
+        this.unscheduled = unscheduled;
+    }
+
+    @Override
+    protected void run(StructuredGraph graph, PhaseContextT context) {
+        runAnalysis(graph, context);
+    }
+
+    @SuppressWarnings("try")
+    public boolean runAnalysis(final StructuredGraph graph, final PhaseContextT context) {
+        boolean changed = false;
+        boolean stop = false;
+        for (int iteration = 0; !stop && iteration < maxIterations && !CompilationAlarm.hasExpired(); iteration++) {
+            try (Scope s = Debug.scope(isEnabled() ? "iteration " + iteration : null)) {
+                ScheduleResult schedule;
+                ControlFlowGraph cfg;
+                if (unscheduled) {
+                    schedule = null;
+                    cfg = ControlFlowGraph.compute(graph, true, true, false, false);
+                } else {
+                    new SchedulePhase(SchedulePhase.SchedulingStrategy.EARLIEST).apply(graph, false);
+                    schedule = graph.getLastSchedule();
+                    cfg = schedule.getCFG();
+                }
+                try (Scope scheduleScope = Debug.scope("EffectsPhaseWithSchedule", schedule)) {
+                    Closure<?> closure = createEffectsClosure(context, schedule, cfg);
+                    ReentrantBlockIterator.apply(closure, cfg.getStartBlock());
+
+                    if (closure.hasChanged()) {
+                        changed = true;
+                    } else {
+                        stop = true;
+                    }
+
+                    // apply the effects collected during this iteration
+                    HashSetNodeEventListener listener = new HashSetNodeEventListener();
+                    try (NodeEventScope nes = graph.trackNodeEvents(listener)) {
+                        closure.applyEffects();
+                    }
+
+                    if (Debug.isDumpEnabled(Debug.INFO_LOG_LEVEL)) {
+                        Debug.dump(Debug.INFO_LOG_LEVEL, graph, "%s iteration", getName());
+                    }
+
+                    new DeadCodeEliminationPhase(Required).apply(graph);
+
+                    Set<Node> changedNodes = listener.getNodes();
+                    for (Node node : graph.getNodes()) {
+                        if (node instanceof Simplifiable) {
+                            changedNodes.add(node);
+                        }
+                    }
+                    postIteration(graph, context, changedNodes);
+                } catch (Throwable t) {
+                    throw Debug.handle(t);
+                }
+            }
+        }
+        return changed;
+    }
+
+    protected void postIteration(final StructuredGraph graph, final PhaseContextT context, Set<Node> changedNodes) {
+        if (canonicalizer != null) {
+            canonicalizer.applyIncremental(graph, context, changedNodes);
+        }
+    }
+
+    protected abstract Closure<?> createEffectsClosure(PhaseContextT context, ScheduleResult schedule, ControlFlowGraph cfg);
+}