tools/fidl/fidlc/testdata/union_sandwich.test.fidl

library fidl.test.unionsandwich;

// These are various unions and structs-containing-unions of different sizes and alignments,
// explicitly designed as test cases for the wire format migration where the FIDL union type is
// changing from a static union on-the-wire (the "old" format) to an extensible union on-the-wire
// (the "v1" format).
//
// See typeshape_tests.cc for furher details.

union UnionSize8Alignment4 {
    1: uint32 variant;
};

struct SandwichUnionSize8Alignment4 {
    uint32 before;
    UnionSize8Alignment4 union;
    uint32 after;
};

union UnionSize12Alignment4 {
    1: array<uint8>:6 variant;
};

struct SandwichUnionSize12Alignment4 {
    uint32 before;
    UnionSize12Alignment4 union;
    int32 after;
};

struct StructSize16Alignment8 {
    uint64 f1;
    uint64 f2;
};

union UnionSize24Alignment8 {
    1: StructSize16Alignment8 variant;
};

struct SandwichUnionSize24Alignment8 {
    uint32 before;
    UnionSize24Alignment8 union;
    uint32 after;
};

union UnionSize36Alignment4 {
    1: array<uint8>:32 variant;
};

struct SandwichUnionSize36Alignment4 {
    uint32 before;
    UnionSize36Alignment4 union;
    uint32 after;
};