code: @Override
      public void sawOpcode(int seen) {
          if (seen == Const.INVOKEINTERFACE) {
              String clsName = getClassConstantOperand();
              String methodName = getNameConstantOperand();
  
              if (queryClasses.contains(clsName) && queryMethods.contains(methodName)) {
                  queryLocations.add(Integer.valueOf(getPC()));
              }
          } else if (OpcodeUtils.isBranch(seen)) {
              int branchTarget = getBranchTarget();
              int pc = getPC();
              if (branchTarget < pc) {
                  loops.add(new LoopLocation(branchTarget, pc));
              }
          }
      }
docs: implements the visitor to collect positions of queries and loops
  
  @param seen
  the opcode of the currently parsed instruction