Java example source code file (Node.java)

This example Java source code file (Node.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

address, addressfield, arraylist, bitset, cintfield, class, hashmap, node, observer, printstream, reflection, string, type, util, virtualbaseconstructor, vmobject

The Node.java Java example source code

/*
 * 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 sun.jvm.hotspot.opto;

import java.io.*;
import java.lang.reflect.Constructor;
import java.util.*;
import sun.jvm.hotspot.debugger.*;
import sun.jvm.hotspot.runtime.*;
import sun.jvm.hotspot.oops.*;
import sun.jvm.hotspot.types.*;

public class Node extends VMObject {
  static {
    VM.registerVMInitializedObserver(new Observer() {
        public void update(Observable o, Object data) {
          initialize(VM.getVM().getTypeDataBase());
        }
      });
  }

  private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {
    Type type      = db.lookupType("Node");
    outmaxField = new CIntField(type.getCIntegerField("_outmax"), 0);
    outcntField = new CIntField(type.getCIntegerField("_outcnt"), 0);
    maxField = new CIntField(type.getCIntegerField("_max"), 0);
    cntField = new CIntField(type.getCIntegerField("_cnt"), 0);
    idxField = new CIntField(type.getCIntegerField("_idx"), 0);
    outField = type.getAddressField("_out");
    inField = type.getAddressField("_in");

    nodeType = db.lookupType("Node");

    virtualConstructor = new VirtualBaseConstructor(db, nodeType, "sun.jvm.hotspot.opto", Node.class);
  }

  private static CIntField outmaxField;
  private static CIntField outcntField;
  private static CIntField maxField;
  private static CIntField cntField;
  private static CIntField idxField;
  private static AddressField outField;
  private static AddressField inField;

  private static VirtualBaseConstructor virtualConstructor;

  private static Type nodeType;

  static HashMap nodes = new HashMap();

  static HashMap constructors = new HashMap();

  static abstract class Instantiator {
    abstract Node create(Address addr);
  }

  static public Node create(Address addr) {
    if (addr == null) return null;
    Node result = (Node)nodes.get(addr);
    if (result == null) {
      result = (Node)virtualConstructor.instantiateWrapperFor(addr);
      nodes.put(addr, result);
    }
    return result;
  }

  public Node(Address addr) {
    super(addr);
  }

  public int outcnt() {
    return (int)outcntField.getValue(this.getAddress());
  }

  public int req() {
    return (int)cntField.getValue(this.getAddress());
  }

  public int len() {
    return (int)maxField.getValue(this.getAddress());
  }

  public int idx() {
    return (int)idxField.getValue(this.getAddress());
  }

  private Node[] _out;
  private Node[] _in;

  public Node rawOut(int i) {
    if (_out == null) {
      int addressSize = (int)VM.getVM().getAddressSize();
      _out = new Node[outcnt()];
      Address ptr = outField.getValue(this.getAddress());
      for (int j = 0; j < outcnt(); j++) {
        _out[j] = Node.create(ptr.getAddressAt(j * addressSize));
      }
    }
    return _out[i];
  }

  public Node in(int i) {
    if (_in == null) {
      int addressSize = (int)VM.getVM().getAddressSize();
      _in = new Node[len()];
      Address ptr = inField.getValue(this.getAddress());
      for (int j = 0; j < len(); j++) {
        _in[j] = Node.create(ptr.getAddressAt(j * addressSize));
      }
    }
    return _in[i];
  }

  public ArrayList collect(int d, boolean onlyCtrl) {
    int depth = Math.abs(d);
    ArrayList nstack = new ArrayList();
    BitSet set = new BitSet();

    nstack.add(this);
    set.set(idx());
    int begin = 0;
    int end = 0;
    for (int i = 0; i < depth; i++) {
      end = nstack.size();
      for(int j = begin; j < end; j++) {
        Node tp  = (Node)nstack.get(j);
        int limit = d > 0 ? tp.len() : tp.outcnt();
        for(int k = 0; k < limit; k++) {
          Node n = d > 0 ? tp.in(k) : tp.rawOut(k);

          // if (NotANode(n))  continue;
          if (n == null) continue;
          // do not recurse through top or the root (would reach unrelated stuff)
          // if (n.isRoot() || n.isTop())  continue;
          // if (onlyCtrl && !n.isCfg()) continue;

          if (!set.get(n.idx())) {
            nstack.add(n);
            set.set(n.idx());
          }
        }
      }
      begin = end;
    }
    return nstack;
  }

  protected void dumpNodes(Node s, int d, boolean onlyCtrl, PrintStream out) {
    if (s == null) return;

    ArrayList nstack = s.collect(d, onlyCtrl);
    int end = nstack.size();
    if (d > 0) {
      for(int j = end-1; j >= 0; j--) {
        ((Node)nstack.get(j)).dump(out);
      }
    } else {
      for(int j = 0; j < end; j++) {
        ((Node)nstack.get(j)).dump(out);
      }
    }
  }

  public void dump(int depth, PrintStream out) {
    dumpNodes(this, depth, false, out);
  }

  public String Name() {
    Type t = VM.getVM().getTypeDataBase().findDynamicTypeForAddress(getAddress(), nodeType);
    String name = null;
    if (t != null) {
        name = t.toString();
    } else {
        Class c = getClass();
        if (c == Node.class) {
            // couldn't identify class type
            return "UnknownNode<" + getAddress().getAddressAt(0) + ">";
        }
        name = getClass().getName();
        if (name.startsWith("sun.jvm.hotspot.opto.")) {
            name = name.substring("sun.jvm.hotspot.opto.".length());
        }
    }
    if (name.endsWith("Node")) {
        return name.substring(0, name.length() - 4);
    }
    return name;
  }

  public void dump(PrintStream out) {
    out.print(" ");
    out.print(idx());
    out.print("\t");
    out.print(Name());
    out.print("\t=== ");
    int i = 0;
    for (i = 0; i < req(); i++) {
      Node n = in(i);
      if (n != null) {
        out.print(' ');
        out.print(in(i).idx());
      } else {
        out.print("_");
      }
      out.print(" ");
    }
    if (len() != req()) {
      int prec = 0;
      for (; i < len(); i++) {
        Node n = in(i);
        if (n != null) {
          if (prec++ == 0) {
            out.print("| ");
          }
          out.print(in(i).idx());
        }
        out.print(" ");
      }
    }
    dumpOut(out);
    dumpSpec(out);
    out.println();
  }

  void dumpOut(PrintStream out) {
    // Delimit the output edges
    out.print(" [[");
    // Dump the output edges
    for (int i = 0; i < outcnt(); i++) {    // For all outputs
      Node u = rawOut(i);
      if (u == null) {
        out.print("_ ");
      // } else if (NotANode(u)) {
      //   out.print("NotANode ");
      } else {
        // out.print("%c%d ", Compile::current()->nodeArena()->contains(u) ? ' ' : 'o', u->_idx);
        out.print(' ');
        out.print(u.idx());
        out.print(' ');
      }
    }
    out.print("]] ");
  }

  public void dumpSpec(PrintStream out) {
  }
}