Hi!
Have a look at this one:
------------------------
C:\>dir
Volume in Laufwerk C: hat keine Bezeichnung.
Volumeseriennummer: 5481-B7B1
Verzeichnis von C:\
15.11.2009 00:02 <DIR> .
15.11.2009 00:02 <DIR> ..
15.11.2009 00:04 372 Test.java
1 Datei(en), 372 Bytes
2 Verzeichnis(se), 158.248.124.416 Bytes frei
C:\>type Test.java
public class Test {
public static void TestMethod (int first, double second, float third) {
third = 15;
first = 12;
second = 17.2;
third = 19;
System.out.println(first);
System.out.println(second);
System.out.println(third);
System.out.println(third);
}
public static void main(String[] args) {
TestMethod (0,0,0);
}
}
C:\>javac Test.java
C:\>java Test
12
17.2
19.0
19.0
C:\>java org.apache.bcel.util.BCELifier Test > TestCreator.java
C:\>type TestCreator.java
import org.apache.bcel.generic.*;
import org.apache.bcel.classfile.*;
import org.apache.bcel.*;
import java.io.*;
public class TestCreator implements Constants {
private InstructionFactory _factory;
private ConstantPoolGen _cp;
private ClassGen _cg;
public TestCreator() {
_cg = new ClassGen("Test", "java.lang.Object", "Test.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();
createMethod_2();
_cg.getJavaClass().dump(out);
}
private void createMethod_0() {
InstructionList il = new InstructionList();
MethodGen method = new MethodGen(ACC_PUBLIC, Type.VOID, Type.NO_ARGS, new
String[] { }, "<init>", "Test", 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(ACC_PUBLIC | ACC_STATIC, Type.VOID, new
Type[] { Type.INT, Type.DOUBLE, Type.FLOAT }, new String[] { "arg0", "arg1",
"arg2" }, "TestMethod", "Test", il, _cp);
InstructionHandle ih_0 = il.append(new PUSH(_cp, 15.0));
il.append(_factory.createStore(Type.FLOAT, 3));
InstructionHandle ih_3 = il.append(new PUSH(_cp, 12));
il.append(_factory.createStore(Type.INT, 0));
InstructionHandle ih_6 = il.append(new PUSH(_cp, 17.2));
il.append(_factory.createStore(Type.DOUBLE, 1));
InstructionHandle ih_10 = il.append(new PUSH(_cp, 19.0));
il.append(_factory.createStore(Type.FLOAT, 3));
InstructionHandle ih_13 =
il.append(_factory.createFieldAccess("java.lang.System", "out", new
ObjectType("java.io.PrintStream"), Constants.GETSTATIC));
il.append(_factory.createLoad(Type.INT, 0));
il.append(_factory.createInvoke("java.io.PrintStream", "println",
Type.VOID, new Type[] { Type.INT }, Constants.INVOKEVIRTUAL));
InstructionHandle ih_20 =
il.append(_factory.createFieldAccess("java.lang.System", "out", new
ObjectType("java.io.PrintStream"), Constants.GETSTATIC));
il.append(_factory.createLoad(Type.DOUBLE, 1));
il.append(_factory.createInvoke("java.io.PrintStream", "println",
Type.VOID, new Type[] { Type.DOUBLE }, Constants.INVOKEVIRTUAL));
InstructionHandle ih_27 =
il.append(_factory.createFieldAccess("java.lang.System", "out", new
ObjectType("java.io.PrintStream"), Constants.GETSTATIC));
il.append(_factory.createLoad(Type.FLOAT, 3));
il.append(_factory.createInvoke("java.io.PrintStream", "println",
Type.VOID, new Type[] { Type.FLOAT }, Constants.INVOKEVIRTUAL));
InstructionHandle ih_34 =
il.append(_factory.createFieldAccess("java.lang.System", "out", new
ObjectType("java.io.PrintStream"), Constants.GETSTATIC));
il.append(_factory.createLoad(Type.FLOAT, 3));
il.append(_factory.createInvoke("java.io.PrintStream", "println",
Type.VOID, new Type[] { Type.FLOAT }, Constants.INVOKEVIRTUAL));
InstructionHandle ih_41 = il.append(_factory.createReturn(Type.VOID));
method.setMaxStack();
method.setMaxLocals();
_cg.addMethod(method.getMethod());
il.dispose();
}
private void createMethod_2() {
InstructionList il = new InstructionList();
MethodGen method = new MethodGen(ACC_PUBLIC | ACC_STATIC, Type.VOID, new
Type[] { new ArrayType(Type.STRING, 1) }, new String[] { "arg0" }, "main",
"Test", il, _cp);
InstructionHandle ih_0 = il.append(new PUSH(_cp, 0));
il.append(new PUSH(_cp, 0.0));
il.append(new PUSH(_cp, 0.0));
il.append(_factory.createInvoke("Test", "TestMethod", Type.VOID, new Type[]
{ Type.INT, Type.DOUBLE, Type.FLOAT }, Constants.INVOKESTATIC));
InstructionHandle ih_6 = il.append(_factory.createReturn(Type.VOID));
method.setMaxStack();
method.setMaxLocals();
_cg.addMethod(method.getMethod());
il.dispose();
}
public static void main(String[] args) throws Exception {
TestCreator creator = new TestCreator();
creator.create(new FileOutputStream("Test.class"));
}
}
C:\>ren Test.class Test.class.old
C:\>javac TestCreator.java
C:\>java TestCreator
C:\>java Test
Exception in thread "main" java.lang.VerifyError: (class: Test, method: main
signature: ([Ljava/lang/String;)V) Expecting to find float on stack
Could not find the main class: Test. Program will exit.
C:\>java -version
java version "1.6.0_16"
Java(TM) SE Runtime Environment (build 1.6.0_16-b01)
Java HotSpot(TM) Client VM (build 14.2-b01, mixed mode, sharing)
C:\>
-----------------------------------------------
With all other programs, which I have tested, it runs ok. But Test.java can not
be BCELified and then again with it correct created.
Btw: BCEL-Version: 5.2 (the latest one).
Greatings
theuserbl
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