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const std = @import("std");
const builtin = @import("builtin");
const assert = std.debug.assert;
const expectEqual = std.testing.expectEqual;
test "flags in packed union" {
if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_spirv) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_riscv64) return error.SkipZigTest; // TODO
try testFlagsInPackedUnion();
try comptime testFlagsInPackedUnion();
}
fn testFlagsInPackedUnion() !void {
const FlagBits = packed struct(u8) {
enable_1: bool = false,
enable_2: bool = false,
enable_3: bool = false,
enable_4: bool = false,
other_flags: packed union {
flags: packed struct(u4) {
enable_1: bool = true,
enable_2: bool = false,
enable_3: bool = false,
enable_4: bool = false,
},
bits: u4,
} = .{ .flags = .{} },
};
var test_bits: FlagBits = .{};
try expectEqual(false, test_bits.enable_1);
try expectEqual(true, test_bits.other_flags.flags.enable_1);
test_bits.enable_1 = true;
try expectEqual(true, test_bits.enable_1);
try expectEqual(true, test_bits.other_flags.flags.enable_1);
test_bits.other_flags.flags.enable_1 = false;
try expectEqual(true, test_bits.enable_1);
try expectEqual(false, test_bits.other_flags.flags.enable_1);
}
test "flags in packed union at offset" {
if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_spirv) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_riscv64) return error.SkipZigTest; // TODO
try testFlagsInPackedUnionAtOffset();
try comptime testFlagsInPackedUnionAtOffset();
}
fn testFlagsInPackedUnionAtOffset() !void {
const FlagBits = packed union {
base_flags: packed struct(u12) {
a: packed union {
flags: packed struct(u4) {
enable_1: bool = true,
enable_2: bool = false,
enable_3: bool = false,
enable_4: bool = false,
},
bits: u4,
},
pad: u8 = 0,
},
adv_flags: packed struct(u12) {
pad: u8 = 0,
adv: packed union {
flags: packed struct(u4) {
enable_1: bool = true,
enable_2: bool = false,
enable_3: bool = false,
enable_4: bool = false,
},
bits: u4,
},
},
};
var test_bits: FlagBits = .{ .adv_flags = .{ .adv = .{ .flags = .{} } } };
try expectEqual(@as(u8, 0), test_bits.adv_flags.pad);
try expectEqual(true, test_bits.adv_flags.adv.flags.enable_1);
try expectEqual(false, test_bits.adv_flags.adv.flags.enable_2);
test_bits.adv_flags.adv.flags.enable_1 = false;
test_bits.adv_flags.adv.flags.enable_2 = true;
try expectEqual(@as(u8, 0), test_bits.adv_flags.pad);
try expectEqual(false, test_bits.adv_flags.adv.flags.enable_1);
try expectEqual(true, test_bits.adv_flags.adv.flags.enable_2);
test_bits.adv_flags.adv.bits = 12;
try expectEqual(@as(u8, 0), test_bits.adv_flags.pad);
try expectEqual(false, test_bits.adv_flags.adv.flags.enable_1);
try expectEqual(false, test_bits.adv_flags.adv.flags.enable_2);
}
// Originally reported at https://github.com/ziglang/zig/issues/16581
test "packed union in packed struct" {
if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_riscv64) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_spirv) return error.SkipZigTest;
try testPackedUnionInPackedStruct();
try comptime testPackedUnionInPackedStruct();
}
fn testPackedUnionInPackedStruct() !void {
const ReadRequest = packed struct { key: i32 };
const RequestType = enum(u1) {
read,
insert,
};
const RequestUnion = packed union {
read: ReadRequest,
};
const Request = packed struct {
active_type: RequestType,
request: RequestUnion,
const Self = @This();
fn init(read: ReadRequest) Self {
return .{
.active_type = .read,
.request = RequestUnion{ .read = read },
};
}
};
try std.testing.expectEqual(RequestType.read, Request.init(.{ .key = 3 }).active_type);
}
test "packed union initialized with a runtime value" {
if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_riscv64) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_spirv) return error.SkipZigTest;
const Fields = packed struct {
timestamp: u50,
random_bits: u13,
};
const ID = packed union {
value: u63,
fields: Fields,
fn getValue() i64 {
return 1341;
}
};
const timestamp: i64 = ID.getValue();
const id = ID{ .fields = Fields{
.timestamp = @as(u50, @intCast(timestamp)),
.random_bits = 420,
} };
try std.testing.expect((ID{ .value = id.value }).fields.timestamp == timestamp);
}
test "assigning to non-active field at comptime" {
comptime {
const FlagBits = packed union {
flags: packed struct {},
bits: packed struct {},
};
var test_bits: FlagBits = .{ .flags = .{} };
test_bits.bits = .{};
}
}
test "comptime packed union of pointers" {
const U = packed union {
a: *const u32,
b: *const [1]u32,
};
const x: u32 = 123;
const u: U = .{ .a = &x };
comptime assert(u.b[0] == 123);
}
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