Re: Doubt regarding reference access

Hi Elisha,

Thanks for your response.  I'm able to get the names
of all the local variables inside the method as an
array. But I need to access the name of the variable
used in a particular instruction.  

I’ve another question actually.  How will I determine
the value of a local variable within a method during
run time?  I wanted to know whether a variable is null
or not. How will I determine this?  Any help is
appreciated. Thanks for your time.

Thanks,
Eshwari


--- C E Ezeugoh <[email protected]> wrote:

> Hi Eshwari,
> AFAIK, you can look at the InstructionHandle to find
> out what sort of 
> instruction is in it.
> System.out.println is most likely to be an
> InvokeInstruction of which you 
> can find out what parameters were passed to it by
> calling getArgumentTypes.
> The following code illustrates this:
> InstructionHandle iHnd;
> Instruction ii;
> ii = (Instruction)iHnd.getInstruction();
> if (ii instanceof InvokeInstruction) {
> argTypes =
> ((InvokeInstruction)ii).getArgumentTypes(cpg);
> .....
> If the statement is of the type str = "dfdfd";
> The Instruction would be an instance of PUTSTATIC or
> PUTFIELD depending on 
> whether str is a static variable or an instance
> variable.
> 
> HTH
> 
> Elisha.
> 
> > 
> > Is it possible to read the reference variable name
> > from a particular instruction? For instance, if I
> have
> > the InstructionHandle to the statement
> > 
> > System.out.println(str.length),
> > 
> > is it possible to get the reference name 'str'
> from
> > the InstructionHandle? In otherwords, how will I
> > determine the reference name being used in a
> > particular instruction? Any help is highly
> > appreciated.
> > 
> > Thanks,
> > Eshwari
> > 
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