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 /* Soot - a J*va Optimization Framework
  * Copyright (C) 2003 Feng Qian
  * This library 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 library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * Lesser General Public License for more details.
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.

Simulates the native method side effects in class java.lang.String

Feng Qian
package soot.jimple.toolkits.pointer.nativemethods;
import soot.*;
public class JavaLangStringNative extends NativeMethodClass {
    public JavaLangStringNativeNativeHelper 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();
    if (subSignature.equals("java.lang.String intern()")) {
    } else {
java.lang.String *********************

Returns a canonical representation for the string object. A pool of strings, initially empty, is maintained privately by the class String. When the intern method is invoked, if the pool already contains a * string equal to this String object as determined by the * equals(Object) method, then the string from the pool is * returned. Otherwise, this String object is added to the pool and a * reference to this String object is returned. It follows that for any two strings s and t, s.intern() == t.intern() is true if and only if s.equals(t) is true. All literal strings and string-valued constant expressions are * interned. String literals are defined in Section 3.10.5 of the Java * Language Specification Returns: a string that has the same contents * as this string, but is guaranteed to be from a pool of unique * strings. Side Effect: from the description, we can see, it is tricky to know the side effect of this native method. Take a conservative way to handle this. It may be

= this; pool = this; why should we care about String in points-to analysis? public native java.lang.String intern();
  public void java_lang_String_intern(SootMethod method,
					     ReferenceVariable thisVar,
					     ReferenceVariable returnVar,
					     ReferenceVariable params[]) {
    .assignObjectTo(returnVar, Environment.v().getStringObject());
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