content: /*
   *  This file is part of AndroidIDE.
   *
   *  AndroidIDE is free software: you can redistribute it and/or modify
   *  it under the terms of the GNU General Public License as published by
   *  the Free Software Foundation, either version 3 of the License, or
   *  (at your option) any later version.
   *
   *  AndroidIDE 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 for more details.
   *
   *  You should have received a copy of the GNU General Public License
   *   along with AndroidIDE.  If not, see <https://www.gnu.org/licenses/>.
   */
  
  /*
   * reserved comment block
   * DO NOT REMOVE OR ALTER!
   */
  package jaxp.sun.org.apache.bcel.internal.util;
  
  /* ====================================================================
   * The Apache Software License, Version 1.1
   *
   * Copyright (c) 2002 The Apache Software Foundation.  All rights
   * reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *
   * 3. The end-user documentation included with the redistribution,
   *    if any, must include the following acknowledgment:
   *       "This product includes software developed by the
   *        Apache Software Foundation (http://www.apache.org/)."
   *    Alternately, this acknowledgment may appear in the software itself,
   *    if and wherever such third-party acknowledgments normally appear.
   *
   * 4. The names "Apache" and "Apache Software Foundation" and
   *    "Apache BCEL" must not be used to endorse or promote products
   *    derived from this software without prior written permission. For
   *    written permission, please contact apache@apache.org.
   *
   * 5. Products derived from this software may not be called "Apache",
   *    "Apache BCEL", nor may "Apache" appear in their name, without
   *    prior written permission of the Apache Software Foundation.
   *
   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   */
  import jaxp.sun.org.apache.bcel.internal.classfile.*;
  import jaxp.sun.org.apache.bcel.internal.generic.*;
  import jaxp.sun.org.apache.bcel.internal.Repository;
  import jaxp.sun.org.apache.bcel.internal.Constants;
  import jaxp.sun.org.apache.bcel.internal.classfile.ClassParser;
  import jaxp.sun.org.apache.bcel.internal.classfile.ConstantValue;
  import jaxp.sun.org.apache.bcel.internal.classfile.EmptyVisitor;
  import jaxp.sun.org.apache.bcel.internal.classfile.Field;
  import jaxp.sun.org.apache.bcel.internal.classfile.JavaClass;
  import jaxp.sun.org.apache.bcel.internal.classfile.Method;
  import jaxp.sun.org.apache.bcel.internal.classfile.Utility;
  import jaxp.sun.org.apache.bcel.internal.generic.ArrayType;
  import jaxp.sun.org.apache.bcel.internal.generic.ConstantPoolGen;
  import jaxp.sun.org.apache.bcel.internal.generic.MethodGen;
  import jaxp.sun.org.apache.bcel.internal.generic.Type;
  
  import java.io.*;
  
  /**
   * This class takes a given JavaClass object and converts it to a
   * Java program that creates that very class using BCEL. This
   * gives new users of BCEL a useful example showing how things
   * are done with BCEL. It does not cover all features of BCEL,
   * but tries to mimic hand-written code as close as possible.
   *
   * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
   */
  public class BCELifier extends EmptyVisitor {
    private JavaClass _clazz;
    private PrintWriter       _out;
    private ConstantPoolGen _cp;
  
    /** @param clazz Java class to "decompile"
     * @param out where to output Java program
     */
    public BCELifier(JavaClass clazz, OutputStream out) {
      _clazz = clazz;
      _out = new PrintWriter(out);
      _cp = new ConstantPoolGen(_clazz.getConstantPool());
    }
  
    /** Start Java code generation
     */
    public void start() {
      visitJavaClass(_clazz);
      _out.flush();
    }
  
    public void visitJavaClass(JavaClass clazz) {
      String class_name   = clazz.getClassName();
      String super_name   = clazz.getSuperclassName();
      String package_name = clazz.getPackageName();
      String inter        = Utility.printArray(clazz.getInterfaceNames(),
                                               false, true);
      if(!"".equals(package_name)) {
        class_name = class_name.substring(package_name.length() + 1);
        _out.println("package " + package_name + ";\n");
       }
  
      _out.println("import jaxp.sun.org.apache.bcel.internal.generic.*;");
      _out.println("import jaxp.sun.org.apache.bcel.internal.classfile.*;");
      _out.println("import jaxp.sun.org.apache.bcel.internal.*;");
      _out.println("import java.io.*;\n");
  
      _out.println("public class " + class_name + "Creator implements Constants {");
      _out.println("  private InstructionFactory _factory;");
      _out.println("  private ConstantPoolGen    _cp;");
      _out.println("  private ClassGen           _cg;\n");
  
      _out.println("  public " + class_name  + "Creator() {");
      _out.println("    _cg = new ClassGen(\"" +
                   (("".equals(package_name))? class_name :
                    package_name + "." + class_name) +
                   "\", \"" + super_name + "\", " +
                   "\"" + clazz.getSourceFileName() + "\", " +
                   printFlags(clazz.getAccessFlags(), true) + ", " +
                   "new String[] { " + inter + " });\n");
  
      _out.println("    _cp = _cg.getConstantPool();");
      _out.println("    _factory = new InstructionFactory(_cg, _cp);");
      _out.println("  }\n");
  
      printCreate();
  
      Field[] fields = clazz.getFields();
  
      if(fields.length > 0) {
        _out.println("  private void createFields() {");
        _out.println("    FieldGen field;");
  
        for(int i=0; i < fields.length; i++) {
          fields[i].accept(this);
        }
  
        _out.println("  }\n");
      }
  
      Method[] methods = clazz.getMethods();
  
      for(int i=0; i < methods.length; i++) {
        _out.println("  private void createMethod_" + i + "() {");
  
        methods[i].accept(this);
        _out.println("  }\n");
      }
  
      printMain();
      _out.println("}");
    }
  
    private void printCreate() {
      _out.println("  public void create(OutputStream out) throws IOException {");
  
      Field[] fields = _clazz.getFields();
      if(fields.length > 0) {
        _out.println("    createFields();");
      }
  
      Method[] methods = _clazz.getMethods();
      for(int i=0; i < methods.length; i++) {
        _out.println("    createMethod_" + i + "();");
      }
  
      _out.println("    _cg.getJavaClass().dump(out);");
  
      _out.println("  }\n");
    }
  
    private void printMain() {
      String   class_name   = _clazz.getClassName();
  
      _out.println("  public static void _main(String[] args) throws Exception {");
      _out.println("    " + class_name + "Creator creator = new " +
                   class_name + "Creator();");
      _out.println("    creator.create(new FileOutputStream(\"" + class_name +
                   ".class\"));");
      _out.println("  }");
    }
  
    public void visitField(Field field) {
      _out.println("\n    field = new FieldGen(" +
                   printFlags(field.getAccessFlags()) +
                   ", " + printType(field.getSignature()) + ", \"" +
                   field.getName() + "\", _cp);");
  
      ConstantValue cv = field.getConstantValue();
  
      if(cv != null) {
        String value = cv.toString();
        _out.println("    field.setInitValue(" + value + ")");
      }
  
      _out.println("    _cg.addField(field.getField());");
    }
  
    public void visitMethod(Method method) {
      MethodGen mg = new MethodGen(method, _clazz.getClassName(), _cp);
  
      Type result_type = mg.getReturnType();
      Type[] arg_types   = mg.getArgumentTypes();
  
      _out.println("    InstructionList il = new InstructionList();");
      _out.println("    MethodGen method = new MethodGen(" +
                   printFlags(method.getAccessFlags()) +
                   ", " + printType(result_type) +
                   ", " + printArgumentTypes(arg_types) + ", " +
                   "new String[] { " +
                   Utility.printArray(mg.getArgumentNames(), false, true) +
                   " }, \"" + method.getName() + "\", \"" +
                   _clazz.getClassName() + "\", il, _cp);\n");
  
      BCELFactory factory = new BCELFactory(mg, _out);
      factory.start();
  
      _out.println("    method.setMaxStack();");
      _out.println("    method.setMaxLocals();");
      _out.println("    _cg.addMethod(method.getMethod());");
      _out.println("    il.dispose();");
    }
  
    static String printFlags(int flags) {
      return printFlags(flags, false);
    }
  
    static String printFlags(int flags, boolean for_class) {
      if(flags == 0)
        return "0";
  
      StringBuffer buf = new StringBuffer();
      for(int i = 0, pow = 1; i <= Constants.MAX_ACC_FLAG; i++) {
        if((flags & pow) != 0) {
          if((pow == Constants.ACC_SYNCHRONIZED) && for_class)
            buf.append("ACC_SUPER | ");
          else
            buf.append("ACC_" + Constants.ACCESS_NAMES[i].toUpperCase() + " | ");
        }
  
        pow <<= 1;
      }
  
      String str = buf.toString();
      return str.substring(0, str.length() - 3);
    }
  
    static String printArgumentTypes(Type[] arg_types) {
      if(arg_types.length == 0)
        return "Type.NO_ARGS";
  
      StringBuffer args = new StringBuffer();
  
      for(int i=0; i < arg_types.length; i++) {
        args.append(printType(arg_types[i]));
  
        if(i < arg_types.length - 1)
          args.append(", ");
      }
  
      return "new Type[] { " + args.toString() + " }";
    }
  
    static String printType(Type type) {
      return printType(type.getSignature());
    }
  
    static String printType(String signature) {
      Type type = Type.getType(signature);
      byte t    = type.getType();
  
      if(t <= Constants.T_VOID) {
        return "Type." + Constants.TYPE_NAMES[t].toUpperCase();
      } else if(type.toString().equals("java.lang.String")) {
        return "Type.STRING";
      } else if(type.toString().equals("java.lang.Object")) {
        return "Type.OBJECT";
      } else if(type.toString().equals("java.lang.StringBuffer")) {
        return "Type.STRINGBUFFER";
      } else if(type instanceof ArrayType) {
        ArrayType at = (ArrayType)type;
  
        return "new ArrayType(" + printType(at.getBasicType()) +
          ", " + at.getDimensions() + ")";
      } else {
        return "new ObjectType(\"" + Utility.signatureToString(signature, false) +
          "\")";
      }
    }
  
    /** Default _main method
     */
    public static void _main(String[] argv) throws Exception {
      JavaClass java_class;
      String    name = argv[0];
  
      if((java_class = Repository.lookupClass(name)) == null)
        java_class = new ClassParser(name).parse(); // May throw IOException
  
      BCELifier bcelifier = new BCELifier(java_class, System.out);
      bcelifier.start();
    }
  }
  