Re: invokevirtual

[Joseph Ryan]

Torsten Curdt wrote:

If have an "invokevirtual" Instruction. How can I
obtain the information which method is actually
being called?
 InstructionList il = mg.getInstructionList();
 InstructionHandle[] ihs = il.getInstructionHandles();
 for (int j = 1; j < ihs.length; j++) {
   Instruction in = ihs[j].getInstruction();
   if (in.getOpcode() == 182) {
     // invoke virtual
     // if (in invokes "mymethod") ...
     System.out.println(in);
   }
 }
 il.dispose(); 


Thats no good; try:

   import org.apache.bcel.generic.INVOKEVIRTUAL;
  
   // ...
  
   if (in instanceof INVOKEVIRTUAL) {
       INVOKEVIRTUAL invv = (INVOKEVIRTUAL) in.getInstruction()
       ConstantPoolGen cp = mg.getConstantPool();
      
       // for more accurate results, check the object on which the 
method is
       // being called's class to see if the object is a subclass of 
the class
       // that you want
       if (   invv.getClassName().equals("...")
           && invv.getMethodName(cp).equals(mymethod)
          ) {
              // ...
        }
   }

- Joe



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