code: public static String convertMethodSignature(InvokeInstruction inv, ConstantPoolGen cpg) {
          return convertMethodSignature(inv.getClassName(cpg), inv.getName(cpg), inv.getSignature(cpg));
      }
docs: Convenience method for generating a method signature in human readable
  form.
  
  @param inv
  an InvokeInstruction
  @param cpg
  the ConstantPoolGen for the class the instruction belongs to