Re: Invocation target runtime type for virtually invoked methods

On Tue, May 25, 2010 at 6:05 PM, Kuperberg, Michael <[email protected]> wrote:
> Hi all,
>
>
>
> I have a question about virtual methods, like in the following example:
>
>
>
> A a = new B();
>
> a.meth();
>
>
>
> meth() invoked using INVOKEVIRTUAL features the *declared* type of the
> invocation target in the bytecode, i.e. "INVOKEVIRTUAL a.meth()". But as I
> am interested in the *runtime* type of the invocation target, I need to
> analyse it.
>
>
>
> Of course, analysing the top element on the stack is an option (using
> getClass(), etc.), but: is there a faster and/or a more convenient option to
> do this using ASM?

I think that you could track NEW instruction (InstructionAdapter is
particularly handy for this) but generally I believe that this will
turn out to be infeasible. First of all you will have to do it on the
whole system level (for methods returning super type), furthermore the
real type often depends on runtime information (as in:
if (sth) a = new A1(); else a = new A2() )


-- 
Greetings
Marcin Rzeźnicki

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