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

  Look at the "Insert Code before Method Exit" section in my AOSD'07
paper linked from the project home page.

  regards,
  Eugene


On Thu, Mar 25, 2010 at 9:49 AM,  <[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.

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