docs: public static @CheckForNull XField findXField(FieldInstruction fins, @Nonnull ConstantPoolGen cpg) {
  
          String className = fins.getClassName(cpg);
          String fieldName = fins.getFieldName(cpg);
          String fieldSig = fins.getSignature(cpg);
  
          boolean isStatic = (fins.getOpcode() == Const.GETSTATIC || fins.getOpcode() == Const.PUTSTATIC);
  
          XField xfield = findXField(className, fieldName, fieldSig, isStatic);
          short opcode = fins.getOpcode();
          if (xfield != null && xfield.isResolved()
                  && xfield.isStatic() == (opcode == Const.GETSTATIC || opcode == Const.PUTSTATIC)) {
              return xfield;
          } else {
              return null;
          }
      }