Re: misunderstanding of InstructionFactory

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Hi,
=A0
You=A0do not=A0mentioned the type of your problem. Is it a Runtime Exceptio=
n or you just didn't get the expected results?. If the second=A0option is t=
he case, then you my=A0inject=A0your code at the end of the constructor whi=
ch, as I can=A0guess, fall after the RETURN instruction.
=A0
If the first option is the case, then AUCH!!, no way to see in dark man, be=
cause your code is corrct (the one with ifact.createThis(), but try Instruc=
tionFactory.createThis();)
).=A0

Best Regards,

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D
A b d u l l a h=A0=A0 O.=A0 A l - Z a g h a m e e m
Technical University of=A0 Berlin
Germany

--- On Mon, 6/15/09, casertap <[email protected]> wrote:


From: casertap <[email protected]>
Subject: misunderstanding of InstructionFactory
To: [email protected]
Date: Monday, June 15, 2009, 7:22 PM



I have a very basic class:
---------------
public class MyClass{
=A0=A0=A0 public static LinkedList<Class> classesLoaded;
=A0=A0=A0 public static void addClass(Object o){
=A0=A0=A0 =A0=A0=A0 Class c =3D o.getClass();
=A0=A0=A0 =A0=A0=A0 classesLoaded.add(c);
=A0=A0=A0 }
}
----------------
I have another class which adds statements to class constructor (when the
class is charged by the JVM).

My class implements ClassFileTransformer and I use the transform method to
do the modification on each class which is loaded.

I just want to add this java code to class constructor :
MyClass.addClass(this);
MyClass.addClass =3D a static invocation of the addClass method
(this) =3D the class which the JVM is loading.
This way I can save a list of class (of my application) which are loaded by
the JVM because every constructor add an object in the classesLoaded
LinkedList.

I suppose, I must use the class InstructionFactory to genetate the byte
code, but I have some problems.

This is what i made but it does not work:

InstructionList il =3D new InstructionList();
InstructionFactory ifact =3D new InstructionFactory(constantPoolGen);

il.append(ifact.createThis());
//I think i must push This on the stack but i do not know
il.append(ifact.createInvoke("MyClass","addClass",Type.VOID, new
Type[]{Type.OBJECT}, Constants.INVOKESTATIC));

it work when I write :

il.append(new PUSH(constantPoolGen,javaClass.getClassName()));
il.append(instructionFactory.createInvoke("MyClass", "addClass", Type.VOID,
new Type[] { Type.OBJECT }, Constants.INVOKESTATIC));

but in the latter version I send a String object to the addClass method. It
is not what I want.

--=20
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tructionFactory-tp24037858p24037858.html
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