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/*
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* Copyright (c) 2013, 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.util;
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import java.util.EnumSet;
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import java.util.Set;
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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 org.graalvm.compiler.graph.Graph.NodeEvent;
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import org.graalvm.compiler.graph.Graph.NodeEventListener;
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import org.graalvm.compiler.graph.Node;
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import org.graalvm.compiler.graph.Node.IndirectCanonicalization;
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import org.graalvm.compiler.nodes.AbstractBeginNode;
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/**
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* A simple {@link NodeEventListener} implementation that accumulates event nodes in a
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* {@link EconomicSet}.
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*/
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public class EconomicSetNodeEventListener extends NodeEventListener {
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private final EconomicSet<Node> nodes;
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private final Set<NodeEvent> filter;
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/**
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* Creates a {@link NodeEventListener} that collects nodes from all events.
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*/
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public EconomicSetNodeEventListener() {
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this.nodes = EconomicSet.create(Equivalence.IDENTITY);
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this.filter = EnumSet.of(NodeEvent.INPUT_CHANGED, NodeEvent.NODE_ADDED, NodeEvent.ZERO_USAGES);
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}
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/**
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* Creates a {@link NodeEventListener} that collects nodes from all events that match a given
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* filter.
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*/
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public EconomicSetNodeEventListener(Set<NodeEvent> filter) {
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this.nodes = EconomicSet.create(Equivalence.IDENTITY);
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this.filter = filter;
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}
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/**
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* Excludes a given event from those for which nodes are collected.
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*/
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public EconomicSetNodeEventListener exclude(NodeEvent e) {
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filter.remove(e);
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return this;
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}
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@Override
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public void changed(NodeEvent e, Node node) {
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if (filter.contains(e)) {
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add(node);
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if (node instanceof IndirectCanonicalization) {
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for (Node usage : node.usages()) {
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add(usage);
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}
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}
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if (node instanceof AbstractBeginNode) {
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AbstractBeginNode abstractBeginNode = (AbstractBeginNode) node;
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add(abstractBeginNode.predecessor());
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}
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}
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}
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private void add(Node n) {
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if (n != null) {
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nodes.add(n);
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}
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}
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/**
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* Gets the set being used to accumulate the nodes communicated to this listener.
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*/
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public EconomicSet<Node> getNodes() {
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return nodes;
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}
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}
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