53 lines
2.0 KiB
Zig
53 lines
2.0 KiB
Zig
const std = @import("std");
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const builtin = @import("builtin");
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const assert = std.debug.assert;
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const expectEqual = std.testing.expectEqual;
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const native_endian = builtin.cpu.arch.endian();
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test "packed struct explicit backing integer" {
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if (builtin.zig_backend == .stage2_wasm) return error.SkipZigTest; // TODO
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if (builtin.zig_backend == .stage2_x86_64) return error.SkipZigTest; // TODO
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if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
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if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
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if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
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const S1 = packed struct { a: u8, b: u8, c: u8 };
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const S2 = packed struct(i24) { d: u8, e: u8, f: u8 };
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const S3 = packed struct { x: S1, y: S2 };
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const S3Padded = packed struct(u64) { s3: S3, pad: u16 };
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try expectEqual(48, @bitSizeOf(S3));
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try expectEqual(@sizeOf(u48), @sizeOf(S3));
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try expectEqual(3, @offsetOf(S3, "y"));
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try expectEqual(24, @bitOffsetOf(S3, "y"));
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if (native_endian == .Little) {
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const s3 = @bitCast(S3Padded, @as(u64, 0xe952d5c71ff4)).s3;
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try expectEqual(@as(u8, 0xf4), s3.x.a);
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try expectEqual(@as(u8, 0x1f), s3.x.b);
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try expectEqual(@as(u8, 0xc7), s3.x.c);
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try expectEqual(@as(u8, 0xd5), s3.y.d);
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try expectEqual(@as(u8, 0x52), s3.y.e);
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try expectEqual(@as(u8, 0xe9), s3.y.f);
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}
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const S4 = packed struct { a: i32, b: i8 };
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const S5 = packed struct(u80) { a: i32, b: i8, c: S4 };
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const S6 = packed struct(i80) { a: i32, b: S4, c: i8 };
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const expectedBitSize = 80;
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const expectedByteSize = @sizeOf(u80);
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try expectEqual(expectedBitSize, @bitSizeOf(S5));
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try expectEqual(expectedByteSize, @sizeOf(S5));
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try expectEqual(expectedBitSize, @bitSizeOf(S6));
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try expectEqual(expectedByteSize, @sizeOf(S6));
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try expectEqual(5, @offsetOf(S5, "c"));
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try expectEqual(40, @bitOffsetOf(S5, "c"));
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try expectEqual(9, @offsetOf(S6, "c"));
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try expectEqual(72, @bitOffsetOf(S6, "c"));
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}
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