Re: Re: Invocation target runtime type for virtually invoked methods

Consider using AspectJ instead. Make a pointcut capturing all calls to  
A.meth(..)  and get hold of the runtime target object/type through an  
around advice' jointPoint. Solves your problem in less lines than this  
conversation.

Regards,
Arvid

On 28 maj 2010, at 15.30, Marcin Rzeźnicki  
<[email protected]> wrote:

> 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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