static Type mergeStructMemberTypes(DataLayout dataLayout, Type t1, Type t2) {
    int align1 = dataLayout.getAlignment(t1);
    int align2 = dataLayout.getAlignment(t2);
    int size1 = dataLayout.getStoreSize(t1);
    int size2 = dataLayout.getStoreSize(t2);

    Type result = align1 < align2 ? t2 : t1;
    int size = align1 < align2 ? size2 : size1;
    int pad = Math.max(size1, size2) - size;
    if (pad > 0) {
      return new StructureType(result, new ArrayType(pad, I8));
    } else {
      return result;
    }
  }
  private StructureType getStructType(SootClass clazz, boolean checkEmpty) {
    int n = 0;
    for (SootMethod method : clazz.getMethods()) {
      n = Math.max(getStructMemberOffset(method) + 1, n);
    }

    Type[] result = new Type[n + 1];

    StructureType superType = null;
    if (clazz.hasSuperclass()) {
      SootClass superclass = clazz.getSuperclass();
      if (!superclass.getName().equals("org.robovm.rt.bro.Struct")) {
        superType = getStructType(superclass, false);
      }
    }
    result[0] = superType != null ? superType : new StructureType();

    for (SootMethod method : clazz.getMethods()) {
      int offset = getStructMemberOffset(method);
      if (offset != -1) {
        if (!method.isNative() && !method.isStatic()) {
          throw new IllegalArgumentException(
              "@StructMember annotated method " + method + " must be native and not static");
        }
        Type type = null;
        if (method.getParameterCount() == 0) {
          soot.Type sootType = method.getReturnType();
          // Possibly a getter
          if (hasPointerAnnotation(method) && !sootType.equals(LongType.v())) {
            throw new IllegalArgumentException(
                "@StructMember("
                    + offset
                    + ") annotated getter "
                    + method
                    + " must be of type long when annotated with @Pointer");
          }
          if (hasMachineSizedFloatAnnotation(method)
              && !sootType.equals(DoubleType.v())
              && !sootType.equals(FloatType.v())) {
            throw new IllegalArgumentException(
                "@StructMember("
                    + offset
                    + ") annotated getter "
                    + method
                    + " must be of type float or double when annotated with @MachineSizedFloat");
          }
          if ((hasMachineSizedSIntAnnotation(method) || hasMachineSizedUIntAnnotation(method))
              && !sootType.equals(LongType.v())) {
            throw new IllegalArgumentException(
                "@StructMember("
                    + offset
                    + ") annotated getter "
                    + method
                    + " must be of type long when annotated with @MachineSizedSInt or @MachineSizedUInt");
          }
          if (sootType instanceof soot.ArrayType && !hasArrayAnnotation(method)) {
            throw new IllegalArgumentException(
                "@Array annotation expected on struct member getter " + method);
          }
        } else if (method.getParameterCount() == 1) {
          soot.Type sootType = method.getParameterType(0);
          if (hasPointerAnnotation(method, 0) && !sootType.equals(LongType.v())) {
            throw new IllegalArgumentException(
                "@StructMember("
                    + offset
                    + ") annotated setter "
                    + method
                    + " must be of type long when annotated with @Pointer");
          }
          if (hasMachineSizedFloatAnnotation(method, 0)
              && !sootType.equals(DoubleType.v())
              && !sootType.equals(FloatType.v())) {
            throw new IllegalArgumentException(
                "@StructMember("
                    + offset
                    + ") annotated setter "
                    + method
                    + " must be of type float or double when annotated with @MachineSizedFloat");
          }
          if ((hasMachineSizedSIntAnnotation(method, 0) || hasMachineSizedUIntAnnotation(method))
              && !sootType.equals(LongType.v())) {
            throw new IllegalArgumentException(
                "@StructMember("
                    + offset
                    + ") annotated setter "
                    + method
                    + " must be of type long when annotated with @MachineSizedSInt or @MachineSizedUInt");
          }
          if (sootType instanceof soot.ArrayType && !hasArrayAnnotation(method, 0)) {
            throw new IllegalArgumentException(
                "@Array annotation expected on first parameter of struct member setter " + method);
          }
          soot.Type retType = method.getReturnType();
          // The return type of the setter must be void or this
          if (!retType.equals(VoidType.v())
              && !(retType instanceof RefType
                  && ((RefType) retType).getSootClass().equals(clazz))) {
            throw new IllegalArgumentException(
                "Setter "
                    + method
                    + " for "
                    + "@StructMember("
                    + offset
                    + ") "
                    + " must either return nothing or return a "
                    + clazz);
          }
        } else {
          throw new IllegalArgumentException(
              "@StructMember annotated method " + method + " has too many parameters");
        }

        type = getStructMemberType(method);
        int index = offset + 1;
        if (result[index] == null) {
          result[index] = type;
        } else if (type != result[index]) {
          // Two members mapped to the same offset (union). Pick
          // the type with the largest alignment and pad with bytes
          // up to the largest size.
          result[index] = mergeStructMemberTypes(config.getDataLayout(), type, result[index]);
        }
      }
    }

    for (int i = 1; i < result.length; i++) {
      if (result[i] == null) {
        throw new IllegalArgumentException("No @StructMember(" + i + ") defined in class " + clazz);
      }
    }

    if (!clazz.isAbstract() && checkEmpty && n == 0 && superType == null) {
      throw new IllegalArgumentException(
          "Struct class " + clazz + " has no @StructMember annotated methods");
    }

    return new StructureType(result);
  }