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

library 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.

type UnionSize8Alignment4 = strict union {
    1: variant uint32;
};

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

type UnionSize12Alignment4 = strict union {
    1: variant array<uint8, 6>;
};

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

type StructSize16Alignment8 = struct {
    f1 uint64;
    f2 uint64;
};

type UnionSize24Alignment8 = strict union {
    1: variant StructSize16Alignment8;
};

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

type UnionSize36Alignment4 = strict union {
    1: variant array<uint8, 32>;
};

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