code: public int length() {
          Opcode opcode = getOpcode();
          if (opcode == null)
              return 1;
  
          switch (opcode) {
              case TABLESWITCH: {
                  int pad = align(pc + 1) - pc;
                  int low = getInt(pad + 4);
                  int high = getInt(pad + 8);
                  return pad + 12 + 4 * (high - low + 1);
              }
              case LOOKUPSWITCH: {
                  int pad = align(pc + 1) - pc;
                  int npairs = getInt(pad + 4);
                  return pad + 8 + 8 * npairs;
  
              }
              default:
                  return opcode.kind.length;
          }
      }
docs: Get the length, in bytes, of this instruction, including the opcode
  and all its operands.