Name: tb29552 Date: 05/27/98


When run with not JIT (JAVA_COMPILER=xxx), program
runs successfully. With 'java' or 'java -nojit',
I get a Stack Overflow exception.

Symantec Java! JustInTime Compiler Version 3.00.045(x) for JDK 1.1.x
Copyright (C) 1996-98 Symantec Corporation

Exception adding Menu--must be running with JIT
java.lang.StackOverflowError
at OrderedHashtable.put(Compiled Code)
                      [ ---> 91 identical lines deleted <--- ]
at OrderedHashtable.put(Compiled Code)
at java.util.Hashtable.put(Compiled Code)
at OrderedHashtable.put(Compiled Code)
at JITTest.crash(JITTest.java:41)
at JITTest.main(JITTest.java:30)


I'm unsure as to the exact cause, so here is a test program.
(NT 4.0, JDK 1.1.6)

import java.util.Hashtable;
import java.util.Vector;

/**
 * demostrates a bug in the JIT
 *
 * To get a StackOverflow error, run as
 * java JITTest
 * or
 * java JITTest -nojit
 * (the -nojit option appears to have no effect).
 *
 * The expected result can be seen with:
 * set JAVA_COMPILER=xxx
 * java JITTest
 */
public class JITTest {
  protected static Hashtable attribTable = new Hashtable();

  public static void main(String args[]) {
    JITTest test = new JITTest( );
    test.crash();
    System.exit( 1 );
  }

  public JITTest( ) {
    attribTable.put(JITTest.class, new Hashtable(1) );
  }

  public void crash( ) {
    try {
      OrderedHashtable temp1 = new OrderedHashtable(1);
      temp1.put("Menu", new java.util.Hashtable(1));

    } catch (Throwable exception) {
      System.err.println("Exception adding Menu--must be running with JIT");
      exception.printStackTrace( );
      System.exit( 1 );
    }
    System.out.println("successful addition--must be running without JIT");
    System.exit( 1 );
  }
}

class OrderedHashtable extends Hashtable {
  private Vector keys;
  public OrderedHashtable(int initialCapacity) {
    super(initialCapacity);
    keys = new Vector(initialCapacity);
  }
  public synchronized Object put(Object key, Object value) {
    Object oldValue = super.put(key,value);
    if (!keys.contains(key)) {
      keys.addElement(key);
    }
    return oldValue;
  }
}
(Review ID: 32413)
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