Given this header:

typedef struct PARAMS {

    union {

        struct {

            int flags1;

            union {

                struct {
                    int flags3;
                } Struct2;

            } DUMMYUNION1;

        } Struct1;

        struct {
            int flags2;
        } Struct2;

    } DUMMYUNION2;

} PARAMS;



This is the struct layout:

static final MemoryLayout PARAMS$struct$LAYOUT_ = MemoryLayout.ofStruct(
        MemoryLayout.ofUnion(
            MemoryLayout.ofStruct(
                C_INT.withName("flags1"),
                MemoryLayout.ofUnion(
                    MemoryLayout.ofStruct(
                        C_INT.withName("flags3")
                    ).withName("Struct2")
                ).withName("DUMMYUNION1")
            ).withName("Struct1"),
            MemoryLayout.ofStruct(
                C_INT.withName("flags2")
            ).withName("Struct2")
        ).withName("DUMMYUNION2")
    ).withName("PARAMS");
    static final jdk.incubator.foreign.MemoryLayout PARAMS$struct$LAYOUT() { return PARAMS$struct$LAYOUT_; }


And this is the layout for the "flags2" field:

    static final VarHandle Struct2$flags2$VH_ = Struct2$struct$LAYOUT_.varHandle(int.class, MemoryLayout.PathElement.groupElement("flags2"));


This configuration results in a runtime error as the layout path from "PARAMS" to "flags2" is not specified correctly.