Re: instrumentation on anonymous class.

Hi,

I just found the problem.

Seems not the problem of anonymous class, it's my programming error in
manipulating the stack.

Thanks.

Best

Zhongxian

On Tue, Nov 2, 2010 at 2:18 AM, David Brosius <[email protected]>wrote:

> the error is shown in a constructor, does the error only occur in
> constructors?
>
> your code would seem to be like this, which doesn't complain in eclipse
>
> public class Outer extends JButton {
>     public Outer() {
>         addActionListener(new ActionListener() {
>             {
>
> OuterWrapper.writeToFile(Integer.valueOf(System.identityHashCode(this)));
>             }
>
>             public void actionPerformed(ActionEvent ae) {
>             }
>         });
>     }
> }
>
> Can you post the javap of the met! hod Test$1, method: <init> signature:
> (I)V  ?
>
> *----- Original Message -----*
> *From:* "Zhongxian Gu" <[email protected]>
> *Sent:* Mon, November 1, 2010 13:15
> *Subject:* [asm] instrumentation on anonymous class.
>
>  Hi,
>
> I encountered some problems when instrument the byte code of some anonymous
> classes. The scenario is like the following,
>
> in a function call, if it is not a static function, I want to record the
> receiver of this function call, which usually be local variable 0.
>
> So my code is like the following:
>
> mv.visitVarInsn(ALOAD, 0);
> mv.visitMethodInsn(INVOKESTATIC, "java/lan! g/System", "identityHashCode",
> "(Ljava/lang/Object ;)I");
>
> mv.visitMethodInsn(INVOKESTATIC, "java/lang/Integer", "valueOf",
> "(I)Ljava/lang/Integer;");
> mv.visitMethodInsn(INVOKESTATIC, "OutputWrapper", "writeToFile",
> "(Ljava/lang/Object;)V");
>
> Is there any problem with this?
>
> I got the following exception: Exception in thread "main"
> java.lang.VerifyError: (class: Test$1, method: <init> signature: (I)V)
> Expecting to find object/array on stack
>
> Thank you guys.
>
> Best
>
> Zhongxian
> --
> Zhongxian Gu
> http://wwwcsif.cs.ucdavis.edu/~gu/ <http://wwwcsif.cs.ucdavis.edu/%7Egu/>
> Ph.D. Student in Computer Science, UC Davis
> 2249 Kemper Hall
>



-- 
Zhongxian Gu
http://wwwcsif.cs.ucdavis.edu/~gu/
Ph.D. Student in Computer Science, UC Davis
2249 Kemper Hall

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