Re: How to wrap a function with a try finally block

Have you thought about wrapping the whole function?

public int method1() {
  code....
}

to:

private void _wrapped_method1() {
  code....
}

public int method1() {
  StaticClass.enter_method();
  try {
    return this._wrapped_method1()
  } finally {
    StaticClass.exit_method();
  }
}

This is a very simple and clean way for transforming the class
and you can use the ASMifyer to help you generate the code
straight forward.

Best regards

Tronje

[email protected] wrote:
> I tried to write a tool to add a static method to every function and guarantee
> it is called before the method return, i wrote something in the MethodAdaptor
> like this:
>    public void visitInsn(int opcode)
>     {	  
>       if ((opcode >= Opcodes.IRETURN && opcode <= Opcodes.RETURN) || opcode ==
> Opcodes.ATHROW)  {
> 	  mv.visitMethodInsn(Opcodes.INVOKESTATIC, className, methodName,
> "()V");
>       }
>       
>       mv.visitInsn(opcode);
>     }	
> 
> It does not work when the method calls some other method and that guy throws a
> RuntimeException, then i tried to use try finally to wrap the whole method body
> like this:
> transfer
> private void method1()
> {
>   code....
>   ...
> } 
> to:
> private void method1()
> {
>   try {
>     code....
>     ...
>   } finally {
>     StaticClass.method();
>   }
> }
> 
> I wrote a small class and checked the binary code with both javap and
> ASMifierClassVisitor, then i realized that i have to figure out every posible
> branche that may jump into the finally block and do something with the
> exception table.
> 
> I have read the guild and have not got anything helpful. It's too hard or i
> just can't do this?
> 
> Thanks for your patience.
>

-- 
You receive this message as a subscriber of the [email protected] mailing list.
To unsubscribe: mailto:[email protected]
For general help: mailto:[email protected]?subject=help
OW2 mailing lists service home page: http://www.ow2.org/wws