[Jikesrvm-researchers] Call instruction for virtual methods

[Vasanth V. <vve...@ro...>]

Hi Jikes list,

I want to instrument some code with a a Call instruction to a virtual
method that I have defined elsewhere in the VM. I know how to do this for
static methods but am confused about the virtual method
case, even after studying the CallHelper() function. Specifically,

Say that I have defined the virtual method in a class myClass:

public class A
{

public void myMethod( );

}

Say that I have defined a field in another class that refers to an
object of this class:

A a = new A( );

and that this field "a" is accessable from the class where I'm creating
this Call instruction.

I want to create a CALL instruction that represents the call,
"a.myMethod()". 

I'm trying to do it like this:

First I add a pointer to the method myMethod in VM_Entrypoints.

Then in my instrumentation phase I have,

Call.create0(CALL, NULL, methodaddress,
OPT_MethodOperand.VIRTUAL(<?>, VM_Entrypoints.myMethod));
 
I'm not sure what to put for the <?> parameter which is 
the VM_MethodReference for the method. Also how do I encode the
information that the object reference should be the "a" field?

Thanks,

Vasanth