JavaCompilerCore/BCEL/bcelifier/IfStatementCreator.java

package bcelifier;

import org.apache.commons.bcel6.generic.*;

import de.dhbwstuttgart.syntaxtree.type.RefType;
import de.dhbwstuttgart.bytecode.ClassGenerator;
import de.dhbwstuttgart.bytecode.MethodGenerator;
import de.dhbwstuttgart.typeinference.TypeinferenceResults;

import org.apache.commons.bcel6.*;
import java.io.*;

public class IfStatementCreator {
  private InstructionFactory _factory;
  private ConstantPoolGen    _cp;
  private ClassGenerator           _cg;

  public IfStatementCreator() {
	  
	TypeinferenceResults typeinferenceResults = null;
	_cg = new ClassGenerator("bcelifier.IfStatement", new RefType("java.lang.Object", null, 0), "IfStatement.java", Const.ACC_SUPER, new String[] {  }, typeinferenceResults);

    _cp = _cg.getConstantPool();
    _factory = new InstructionFactory(_cg, _cp);
  }

  public void create(OutputStream out) throws IOException {
    createMethod_0();
    createMethod_1();
    _cg.getJavaClass().dump(out);
  }

  private void createMethod_0() {
    InstructionList il = new InstructionList();
    MethodGen method = new MethodGenerator(0, Type.VOID, new Type[] { new ObjectType("java.lang.Boolean") }, new String[] { "arg0" }, "<init>", "bcelifier.IfStatement", il, _cp);

    InstructionHandle ih_0 = il.append(_factory.createLoad(Type.OBJECT, 0));
    il.append(_factory.createInvoke("java.lang.Object", "<init>", Type.VOID, Type.NO_ARGS, Const.INVOKESPECIAL));
    InstructionHandle ih_4 = il.append(_factory.createReturn(Type.VOID));
    method.setMaxStack();
    method.setMaxLocals();
    _cg.addMethod(method.getMethod());
  }

  private void createMethod_1() {
    InstructionList il = new InstructionList();
    MethodGen method = new MethodGenerator(0, new ObjectType("java.lang.Integer"), new Type[] { new ObjectType("java.lang.Boolean") }, new String[] { "arg0" }, "methode", "bcelifier.IfStatement", il, _cp);

    il.append(InstructionFactory.createLoad(Type.OBJECT, 1));
    il.append(_factory.createInvoke("java.lang.Boolean", "booleanValue", Type.BOOLEAN, Type.NO_ARGS, Const.INVOKEVIRTUAL));
    BranchInstruction ifeq_4 = InstructionFactory.createBranchInstruction(Const.IFEQ, null);
    il.append(ifeq_4);
    il.append(new PUSH(_cp, 1));
    il.append(_factory.createInvoke("java.lang.Integer", "valueOf", new ObjectType("java.lang.Integer"), new Type[] { Type.INT }, Const.INVOKESTATIC));
    il.append(InstructionFactory.createReturn(Type.OBJECT));
    InstructionHandle ih_12 = il.append(new PUSH(_cp, 2));
    il.append(_factory.createInvoke("java.lang.Integer", "valueOf", new ObjectType("java.lang.Integer"), new Type[] { Type.INT }, Const.INVOKESTATIC));
    il.append(InstructionFactory.createReturn(Type.OBJECT));
    ifeq_4.setTarget(ih_12);
    method.setMaxStack();
    method.setMaxLocals();
    _cg.addMethod(method.getMethod());
  }

  public static void main(String[] args) throws Exception {
    bcelifier.IfStatementCreator creator = new bcelifier.IfStatementCreator();
    creator.create(new FileOutputStream("bcelifier.IfStatement.class"));
    
    System.out.println("bcelifier.IfStatement.class");
  }
}