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/*
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* Copyright (c) 2017, 2019, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package org.graalvm.compiler.phases.common;
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import jdk.internal.vm.compiler.collections.EconomicMap;
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import jdk.internal.vm.compiler.collections.EconomicSet;
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import jdk.internal.vm.compiler.collections.Equivalence;
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import jdk.internal.vm.compiler.collections.MapCursor;
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import org.graalvm.compiler.graph.NodeStack;
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import org.graalvm.compiler.nodes.AbstractBeginNode;
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import org.graalvm.compiler.nodes.AbstractDeoptimizeNode;
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import org.graalvm.compiler.nodes.AbstractEndNode;
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import org.graalvm.compiler.nodes.AbstractMergeNode;
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import org.graalvm.compiler.nodes.ControlSplitNode;
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import org.graalvm.compiler.nodes.FixedNode;
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import org.graalvm.compiler.nodes.StructuredGraph;
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import org.graalvm.compiler.nodes.spi.CoreProviders;
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import org.graalvm.compiler.phases.BasePhase;
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/**
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* This phase will make sure that the branch leading towards this deopt has 0.0 probability.
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*
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*/
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public class PropagateDeoptimizeProbabilityPhase extends BasePhase<CoreProviders> {
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@Override
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@SuppressWarnings("try")
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protected void run(final StructuredGraph graph, CoreProviders context) {
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assert !graph.hasValueProxies() : "ConvertDeoptimizeToGuardPhase always creates proxies";
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if (graph.hasNode(AbstractDeoptimizeNode.TYPE)) {
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NodeStack stack = new NodeStack();
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EconomicMap<ControlSplitNode, EconomicSet<AbstractBeginNode>> reachableSplits = EconomicMap.create(Equivalence.IDENTITY);
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// Mark all control flow nodes that are post-dominated by a deoptimization.
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for (AbstractDeoptimizeNode d : graph.getNodes(AbstractDeoptimizeNode.TYPE)) {
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stack.push(AbstractBeginNode.prevBegin(d));
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while (!stack.isEmpty()) {
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AbstractBeginNode beginNode = (AbstractBeginNode) stack.pop();
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FixedNode fixedNode = (FixedNode) beginNode.predecessor();
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if (fixedNode == null) {
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// Can happen for start node.
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} else if (fixedNode instanceof AbstractMergeNode) {
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AbstractMergeNode mergeNode = (AbstractMergeNode) fixedNode;
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for (AbstractEndNode end : mergeNode.forwardEnds()) {
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AbstractBeginNode newBeginNode = AbstractBeginNode.prevBegin(end);
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stack.push(newBeginNode);
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}
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} else if (fixedNode instanceof ControlSplitNode) {
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ControlSplitNode controlSplitNode = (ControlSplitNode) fixedNode;
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EconomicSet<AbstractBeginNode> reachableSuccessors = reachableSplits.get(controlSplitNode);
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if (reachableSuccessors == null) {
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reachableSuccessors = EconomicSet.create();
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reachableSplits.put(controlSplitNode, reachableSuccessors);
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}
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if (controlSplitNode.getSuccessorCount() == reachableSuccessors.size() - 1) {
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// All successors of this split lead to deopt, propagate reachability
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// further upwards.
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reachableSplits.removeKey(controlSplitNode);
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stack.push(AbstractBeginNode.prevBegin((FixedNode) controlSplitNode.predecessor()));
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} else {
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reachableSuccessors.add(beginNode);
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}
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} else {
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stack.push(AbstractBeginNode.prevBegin(fixedNode));
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}
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}
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}
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// Make sure the probability on the path towards the deoptimization is 0.0.
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MapCursor<ControlSplitNode, EconomicSet<AbstractBeginNode>> entries = reachableSplits.getEntries();
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while (entries.advance()) {
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ControlSplitNode controlSplitNode = entries.getKey();
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EconomicSet<AbstractBeginNode> value = entries.getValue();
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for (AbstractBeginNode begin : value) {
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double probability = controlSplitNode.probability(begin);
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if (probability != 0.0) {
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controlSplitNode.setProbability(begin, 0.0);
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}
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}
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}
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}
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}
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}
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