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NewClassCreator

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JanUlrich 2015-11-13 12:23:45 +01:00
parent 0048d5f305
commit 4c908abede
2 changed files with 69 additions and 0 deletions
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9
BCEL/bcelifier/NewClass.java Normal file
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package bcelifier;
public class NewClass {
public NewClass(Integer i){}
void methode2(){
new NewClass(1);
}
}

60
BCEL/bcelifier/NewClassCreator.java Normal file
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package bcelifier;
import org.apache.commons.bcel6.generic.*;
import org.apache.commons.bcel6.classfile.*;
import org.apache.commons.bcel6.*;
import java.io.*;
public class NewClassCreator implements Constants {
private InstructionFactory _factory;
private ConstantPoolGen _cp;
private ClassGen _cg;
public NewClassCreator() {
_cg = new ClassGen("bcelifier.NewClass", "java.lang.Object", "NewClass.java", ACC_PUBLIC | ACC_SUPER, new String[] { });
_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 MethodGen(ACC_PUBLIC, Type.VOID, new Type[] { new ObjectType("java.lang.Integer") }, new String[] { "arg0" }, "<init>", "bcelifier.NewClass", 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, Constants.INVOKESPECIAL));
InstructionHandle ih_4 = il.append(_factory.createReturn(Type.VOID));
method.setMaxStack();
method.setMaxLocals();
_cg.addMethod(method.getMethod());
il.dispose();
}
private void createMethod_1() {
InstructionList il = new InstructionList();
MethodGen method = new MethodGen(0, Type.VOID, Type.NO_ARGS, new String[] { }, "methode2", "bcelifier.NewClass", il, _cp);
InstructionHandle ih_0 = il.append(_factory.createNew("bcelifier.NewClass"));
il.append(InstructionConstants.DUP);
il.append(new PUSH(_cp, 1));
il.append(_factory.createInvoke("java.lang.Integer", "valueOf", new ObjectType("java.lang.Integer"), new Type[] { Type.INT }, Constants.INVOKESTATIC));
il.append(_factory.createInvoke("bcelifier.NewClass", "<init>", Type.VOID, new Type[] { new ObjectType("java.lang.Integer") }, Constants.INVOKESPECIAL));
il.append(InstructionConstants.POP);
InstructionHandle ih_12 = il.append(_factory.createReturn(Type.VOID));
method.setMaxStack();
method.setMaxLocals();
_cg.addMethod(method.getMethod());
il.dispose();
}
public static void main(String[] args) throws Exception {
bcelifier.NewClassCreator creator = new bcelifier.NewClassCreator();
creator.create(new FileOutputStream("bcelifier.NewClass.class"));
}
}