Mercurial > hg > graal-jvmci-8
view graal/GraalGraph/src/com/oracle/graal/graph/Node.java @ 2790:50677668afe3
Towards making goto removal work.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 25 May 2011 19:29:40 +0200 |
parents | b72e6638b9e6 |
children | 6d14aa4fbf90 |
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/* * Copyright (c) 2011, 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 com.oracle.graal.graph; import java.util.ArrayList; import java.util.Collections; import java.util.List; public abstract class Node { public static final Node Null = null; public static final int DeletedID = -1; final Graph graph; private int id; final NodeArray inputs; final NodeArray successors; final ArrayList<Node> usages; final ArrayList<Node> predecessors; final ArrayList<Integer> predecessorsIndex; public Node(int inputCount, int successorCount, Graph graph) { assert graph != null; this.graph = graph; this.id = graph.register(this); this.inputs = new NodeArray(this, inputCount); this.successors = new NodeArray(this, successorCount); this.predecessors = new ArrayList<Node>(); this.usages = new ArrayList<Node>(); this.predecessorsIndex = new ArrayList<Integer>(); } public List<Node> predecessors() { return Collections.unmodifiableList(predecessors); } public List<Integer> predecessorsIndex() { return Collections.unmodifiableList(predecessorsIndex); } public List<Node> usages() { return Collections.unmodifiableList(usages); } public NodeArray inputs() { return inputs; } public NodeArray successors() { return successors; } public int id() { return id; } public Graph graph() { return graph; } public String shortName() { return getClass().getSimpleName(); } public void replace(Node other) { assert !isDeleted() && !other.isDeleted(); assert other == null || other.graph == graph; for (Node usage : usages) { usage.inputs.replaceFirstOccurrence(this, other); } int z = 0; for (Node predecessor : predecessors) { int predIndex = predecessorsIndex.get(z); predecessor.successors.nodes[predIndex] = other; ++z; } if (other != null) { other.usages.addAll(usages); other.predecessors.addAll(predecessors); other.predecessorsIndex.addAll(predecessorsIndex); } usages.clear(); predecessors.clear(); predecessorsIndex.clear(); delete(); } public boolean isDeleted() { return id == DeletedID; } public void delete() { assert !isDeleted(); assert usages.size() == 0 && predecessors.size() == 0; assert predecessorsIndex.size() == 0; for (int i = 0; i < inputs.size(); ++i) { inputs.set(i, Null); } for (int i = 0; i < successors.size(); ++i) { successors.set(i, Null); } assert predecessors().size() == 0 && usages().size() == 0; // make sure its not connected. pred usages graph.unregister(this); id = DeletedID; assert isDeleted(); } public Node copy() { return copy(graph); } /** * * @param into * @return */ public abstract Node copy(Graph into); /** * * @return */ protected int inputCount() { return 0; } /** * * @return */ protected int successorCount() { return 0; } @Override public String toString() { return this.getClass().getSimpleName() + "-" + this.id(); } }