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A Java Optimization Framework
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package soot.jimple.toolkits.pointer.nativemethods;

/*-
 * #%L
 * Soot - a J*va Optimization Framework
 * %%
 * Copyright (C) 2003 Feng Qian
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 2.1 of the
 * License, or (at your option) any later version.
 * 
 * This program 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 Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU General Lesser Public
 * License along with this program.  If not, see
 * .
 * #L%
 */

import soot.SootMethod;
import soot.jimple.toolkits.pointer.representations.Environment;
import soot.jimple.toolkits.pointer.representations.ReferenceVariable;
import soot.jimple.toolkits.pointer.util.NativeHelper;

public class JavaLangObjectNative extends NativeMethodClass {
  public JavaLangObjectNative(NativeHelper helper) {
    super(helper);
  }

  /**
   * Implements the abstract method simulateMethod. It distributes the request to the corresponding methods by signatures.
   */
  public void simulateMethod(SootMethod method, ReferenceVariable thisVar, ReferenceVariable returnVar,
      ReferenceVariable params[]) {
    String subSignature = method.getSubSignature();

    /* Driver */

    if (subSignature.equals("java.lang.Class getClass()")) {
      java_lang_Object_getClass(method, thisVar, returnVar, params);
      return;

    } else if (subSignature.equals("java.lang.Object clone()")) {
      java_lang_Object_clone(method, thisVar, returnVar, params);
      return;

    } else {
      defaultMethod(method, thisVar, returnVar, params);
      return;
    }
  }

  /*********************** java.lang.Object *********************/
  /**
   * The return variable is assigned an abstract object representing all classes (UnknowClassObject) from environment.
   *
   * public final native java.lang.Class getClass();
   */
  public void java_lang_Object_getClass(SootMethod method, ReferenceVariable thisVar, ReferenceVariable returnVar,
      ReferenceVariable params[]) {
    helper.assignObjectTo(returnVar, Environment.v().getClassObject());
  }

  /**
   * Creates and returns a copy of this object. The precise meaning of "copy" may depend on the class of the object. The
   * general intent is that, for any object x, the expression:
   *
   * x.clone() != x
   *
   * will be true, and that the expression:
   *
   * x.clone().getClass() == x.getClass()
   *
   * will be true, but these are not absolute requirements. While it is typically the case that:
   *
   * x.clone().equals(x)
   *
   * will be true, this is not an absolute requirement. Copying an object will typically entail creating a new instance of
   * its class, but it also may require copying of internal data structures as well. No constructors are called.
   *
   * NOTE: it may raise an exception, the decision of cloning made by analysis by implementing the
   * ReferneceVariable.cloneObject() method.
   *
   * protected native java.lang.Object clone() throws java.lang.CloneNotSupported
   */
  public void java_lang_Object_clone(SootMethod method, ReferenceVariable thisVar, ReferenceVariable returnVar,
      ReferenceVariable params[]) {
    if (thisVar == null) {
      throw new RuntimeException("Need a 'this' variable to perform a clone()");
    }

    ReferenceVariable newVar = helper.cloneObject(thisVar);
    helper.assign(returnVar, newVar);
  }

  /**
   * Following methods have NO side effect
   *
   * private static native void registerNatives(); public native int hashCode(); public final native void notify(); public
   * final native void notifyAll(); public final native void wait(long) throws java.lang.InterruptedException;
   */

}