mirror of
https://github.com/ziglang/zig.git
synced 2025-12-06 06:13:07 +00:00
1075 lines
35 KiB
Zig
1075 lines
35 KiB
Zig
const std = @import("std");
|
|
const builtin = @import("builtin");
|
|
const assert = std.debug.assert;
|
|
const expect = std.testing.expect;
|
|
const expectEqual = std.testing.expectEqual;
|
|
const native_endian = builtin.cpu.arch.endian();
|
|
|
|
test "flags in packed structs" {
|
|
if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
|
|
|
|
const Flags1 = packed struct {
|
|
// first 8 bits
|
|
b0_0: u1,
|
|
b0_1: u1,
|
|
b0_2: u1,
|
|
b0_3: u1,
|
|
b0_4: u1,
|
|
b0_5: u1,
|
|
b0_6: u1,
|
|
b0_7: u1,
|
|
|
|
// 7 more bits
|
|
b1_0: u1,
|
|
b1_1: u1,
|
|
b1_2: u1,
|
|
b1_3: u1,
|
|
b1_4: u1,
|
|
b1_5: u1,
|
|
b1_6: u1,
|
|
|
|
// some padding to fill to 24 bits
|
|
_: u9,
|
|
};
|
|
|
|
try expectEqual(@sizeOf(u24), @sizeOf(Flags1));
|
|
try expectEqual(24, @bitSizeOf(Flags1));
|
|
|
|
const Flags2 = packed struct {
|
|
// byte 0
|
|
b0_0: u1,
|
|
b0_1: u1,
|
|
b0_2: u1,
|
|
b0_3: u1,
|
|
b0_4: u1,
|
|
b0_5: u1,
|
|
b0_6: u1,
|
|
b0_7: u1,
|
|
|
|
// partial byte 1 (but not 8 bits)
|
|
b1_0: u1,
|
|
b1_1: u1,
|
|
b1_2: u1,
|
|
b1_3: u1,
|
|
b1_4: u1,
|
|
b1_5: u1,
|
|
b1_6: u1,
|
|
|
|
// some padding that should yield @sizeOf(Flags2) == 4
|
|
_: u10,
|
|
};
|
|
|
|
try expectEqual(@sizeOf(u25), @sizeOf(Flags2));
|
|
try expectEqual(25, @bitSizeOf(Flags2));
|
|
|
|
const Flags3 = packed struct {
|
|
// byte 0
|
|
b0_0: u1,
|
|
b0_1: u1,
|
|
b0_2: u1,
|
|
b0_3: u1,
|
|
b0_4: u1,
|
|
b0_5: u1,
|
|
b0_6: u1,
|
|
b0_7: u1,
|
|
|
|
// byte 1
|
|
b1_0: u1,
|
|
b1_1: u1,
|
|
b1_2: u1,
|
|
b1_3: u1,
|
|
b1_4: u1,
|
|
b1_5: u1,
|
|
b1_6: u1,
|
|
b1_7: u1,
|
|
|
|
// some padding that should yield @sizeOf(Flags2) == 4
|
|
_: u16, // it works, if the padding is 8-based
|
|
};
|
|
|
|
try expectEqual(@sizeOf(u32), @sizeOf(Flags3));
|
|
try expectEqual(32, @bitSizeOf(Flags3));
|
|
}
|
|
|
|
test "consistent size of packed structs" {
|
|
if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
|
|
|
|
const TxData1 = packed struct { data: u8, _23: u23, full: bool = false };
|
|
const TxData2 = packed struct { data: u9, _22: u22, full: bool = false };
|
|
|
|
const register_size_bits = 32;
|
|
const register_size_bytes = @sizeOf(u32);
|
|
|
|
try expectEqual(register_size_bits, @bitSizeOf(TxData1));
|
|
try expectEqual(register_size_bytes, @sizeOf(TxData1));
|
|
|
|
try expectEqual(register_size_bits, @bitSizeOf(TxData2));
|
|
try expectEqual(register_size_bytes, @sizeOf(TxData2));
|
|
|
|
const TxData4 = packed struct { a: u32, b: u24 };
|
|
const TxData6 = packed struct { a: u24, b: u32 };
|
|
|
|
const expectedBitSize = 56;
|
|
const expectedByteSize = @sizeOf(u56);
|
|
|
|
try expectEqual(expectedBitSize, @bitSizeOf(TxData4));
|
|
try expectEqual(expectedByteSize, @sizeOf(TxData4));
|
|
|
|
try expectEqual(expectedBitSize, @bitSizeOf(TxData6));
|
|
try expectEqual(expectedByteSize, @sizeOf(TxData6));
|
|
}
|
|
|
|
test "correct sizeOf and offsets in packed structs" {
|
|
if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
|
|
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_spirv64) return error.SkipZigTest;
|
|
|
|
const PStruct = packed struct {
|
|
bool_a: bool,
|
|
bool_b: bool,
|
|
bool_c: bool,
|
|
bool_d: bool,
|
|
bool_e: bool,
|
|
bool_f: bool,
|
|
u1_a: u1,
|
|
bool_g: bool,
|
|
u1_b: u1,
|
|
u3_a: u3,
|
|
u10_a: u10,
|
|
u10_b: u10,
|
|
};
|
|
try expectEqual(0, @offsetOf(PStruct, "bool_a"));
|
|
try expectEqual(0, @bitOffsetOf(PStruct, "bool_a"));
|
|
try expectEqual(0, @offsetOf(PStruct, "bool_b"));
|
|
try expectEqual(1, @bitOffsetOf(PStruct, "bool_b"));
|
|
try expectEqual(0, @offsetOf(PStruct, "bool_c"));
|
|
try expectEqual(2, @bitOffsetOf(PStruct, "bool_c"));
|
|
try expectEqual(0, @offsetOf(PStruct, "bool_d"));
|
|
try expectEqual(3, @bitOffsetOf(PStruct, "bool_d"));
|
|
try expectEqual(0, @offsetOf(PStruct, "bool_e"));
|
|
try expectEqual(4, @bitOffsetOf(PStruct, "bool_e"));
|
|
try expectEqual(0, @offsetOf(PStruct, "bool_f"));
|
|
try expectEqual(5, @bitOffsetOf(PStruct, "bool_f"));
|
|
try expectEqual(0, @offsetOf(PStruct, "u1_a"));
|
|
try expectEqual(6, @bitOffsetOf(PStruct, "u1_a"));
|
|
try expectEqual(0, @offsetOf(PStruct, "bool_g"));
|
|
try expectEqual(7, @bitOffsetOf(PStruct, "bool_g"));
|
|
try expectEqual(1, @offsetOf(PStruct, "u1_b"));
|
|
try expectEqual(8, @bitOffsetOf(PStruct, "u1_b"));
|
|
try expectEqual(1, @offsetOf(PStruct, "u3_a"));
|
|
try expectEqual(9, @bitOffsetOf(PStruct, "u3_a"));
|
|
try expectEqual(1, @offsetOf(PStruct, "u10_a"));
|
|
try expectEqual(12, @bitOffsetOf(PStruct, "u10_a"));
|
|
try expectEqual(2, @offsetOf(PStruct, "u10_b"));
|
|
try expectEqual(22, @bitOffsetOf(PStruct, "u10_b"));
|
|
try expectEqual(4, @sizeOf(PStruct));
|
|
|
|
if (native_endian == .little) {
|
|
const s1 = @as(PStruct, @bitCast(@as(u32, 0x12345678)));
|
|
try expectEqual(false, s1.bool_a);
|
|
try expectEqual(false, s1.bool_b);
|
|
try expectEqual(false, s1.bool_c);
|
|
try expectEqual(true, s1.bool_d);
|
|
try expectEqual(true, s1.bool_e);
|
|
try expectEqual(true, s1.bool_f);
|
|
try expectEqual(@as(u1, 1), s1.u1_a);
|
|
try expectEqual(false, s1.bool_g);
|
|
try expectEqual(@as(u1, 0), s1.u1_b);
|
|
try expectEqual(@as(u3, 3), s1.u3_a);
|
|
try expectEqual(@as(u10, 0b1101000101), s1.u10_a);
|
|
try expectEqual(@as(u10, 0b0001001000), s1.u10_b);
|
|
|
|
const s2 = @as(packed struct { x: u1, y: u7, z: u24 }, @bitCast(@as(u32, 0xd5c71ff4)));
|
|
try expectEqual(@as(u1, 0), s2.x);
|
|
try expectEqual(@as(u7, 0b1111010), s2.y);
|
|
try expectEqual(@as(u24, 0xd5c71f), s2.z);
|
|
}
|
|
}
|
|
|
|
test "nested packed structs" {
|
|
if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
|
|
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_spirv64) return error.SkipZigTest;
|
|
|
|
const S1 = packed struct { a: u8, b: u8, c: u8 };
|
|
|
|
const S2 = packed struct { d: u8, e: u8, f: u8 };
|
|
|
|
const S3 = packed struct { x: S1, y: S2 };
|
|
const S3Padded = packed struct { s3: S3, pad: u16 };
|
|
|
|
try expectEqual(48, @bitSizeOf(S3));
|
|
try expectEqual(@sizeOf(u48), @sizeOf(S3));
|
|
|
|
try expectEqual(3, @offsetOf(S3, "y"));
|
|
try expectEqual(24, @bitOffsetOf(S3, "y"));
|
|
|
|
if (native_endian == .little) {
|
|
const s3 = @as(S3Padded, @bitCast(@as(u64, 0xe952d5c71ff4))).s3;
|
|
try expectEqual(@as(u8, 0xf4), s3.x.a);
|
|
try expectEqual(@as(u8, 0x1f), s3.x.b);
|
|
try expectEqual(@as(u8, 0xc7), s3.x.c);
|
|
try expectEqual(@as(u8, 0xd5), s3.y.d);
|
|
try expectEqual(@as(u8, 0x52), s3.y.e);
|
|
try expectEqual(@as(u8, 0xe9), s3.y.f);
|
|
}
|
|
|
|
const S4 = packed struct { a: i32, b: i8 };
|
|
const S5 = packed struct { a: i32, b: i8, c: S4 };
|
|
const S6 = packed struct { a: i32, b: S4, c: i8 };
|
|
|
|
const expectedBitSize = 80;
|
|
const expectedByteSize = @sizeOf(u80);
|
|
try expectEqual(expectedBitSize, @bitSizeOf(S5));
|
|
try expectEqual(expectedByteSize, @sizeOf(S5));
|
|
try expectEqual(expectedBitSize, @bitSizeOf(S6));
|
|
try expectEqual(expectedByteSize, @sizeOf(S6));
|
|
|
|
try expectEqual(5, @offsetOf(S5, "c"));
|
|
try expectEqual(40, @bitOffsetOf(S5, "c"));
|
|
try expectEqual(9, @offsetOf(S6, "c"));
|
|
try expectEqual(72, @bitOffsetOf(S6, "c"));
|
|
}
|
|
|
|
test "regular in irregular packed struct" {
|
|
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; // TODO
|
|
if (builtin.zig_backend == .stage2_spirv64) return error.SkipZigTest;
|
|
|
|
const Irregular = packed struct {
|
|
bar: Regular = Regular{},
|
|
_: u24 = 0,
|
|
pub const Regular = packed struct { a: u16 = 0, b: u8 = 0 };
|
|
};
|
|
|
|
var foo = Irregular{};
|
|
foo.bar.a = 235;
|
|
foo.bar.b = 42;
|
|
|
|
try expectEqual(@as(u16, 235), foo.bar.a);
|
|
try expectEqual(@as(u8, 42), foo.bar.b);
|
|
}
|
|
|
|
test "nested packed struct unaligned" {
|
|
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; // TODO
|
|
if (builtin.zig_backend == .stage2_spirv64) return error.SkipZigTest;
|
|
if (native_endian != .little) return error.SkipZigTest; // Byte aligned packed struct field pointers have not been implemented yet
|
|
|
|
const S1 = packed struct {
|
|
a: u4,
|
|
b: u4,
|
|
c: u8,
|
|
};
|
|
const S2 = packed struct {
|
|
base: u8,
|
|
p0: S1,
|
|
bit0: u1,
|
|
p1: packed struct {
|
|
a: u8,
|
|
},
|
|
p2: packed struct {
|
|
a: u7,
|
|
b: u8,
|
|
},
|
|
p3: S1,
|
|
|
|
var s: @This() = .{
|
|
.base = 1,
|
|
.p0 = .{ .a = 2, .b = 3, .c = 4 },
|
|
.bit0 = 0,
|
|
.p1 = .{ .a = 5 },
|
|
.p2 = .{ .a = 6, .b = 7 },
|
|
.p3 = .{ .a = 8, .b = 9, .c = 10 },
|
|
};
|
|
};
|
|
|
|
try expect(S2.s.base == 1);
|
|
try expect(S2.s.p0.a == 2);
|
|
try expect(S2.s.p0.b == 3);
|
|
try expect(S2.s.p0.c == 4);
|
|
try expect(S2.s.bit0 == 0);
|
|
try expect(S2.s.p1.a == 5);
|
|
try expect(S2.s.p2.a == 6);
|
|
try expect(S2.s.p2.b == 7);
|
|
try expect(S2.s.p3.a == 8);
|
|
try expect(S2.s.p3.b == 9);
|
|
try expect(S2.s.p3.c == 10);
|
|
|
|
const S3 = packed struct {
|
|
pad: u8,
|
|
v: u2,
|
|
s: packed struct {
|
|
v: u3,
|
|
s: packed struct {
|
|
v: u2,
|
|
s: packed struct {
|
|
bit0: u1,
|
|
byte: u8,
|
|
bit1: u1,
|
|
},
|
|
},
|
|
},
|
|
var v0: @This() = .{ .pad = 0, .v = 1, .s = .{ .v = 2, .s = .{ .v = 3, .s = .{ .bit0 = 0, .byte = 4, .bit1 = 1 } } } };
|
|
};
|
|
|
|
try expect(S3.v0.v == 1);
|
|
try expect(S3.v0.s.v == 2);
|
|
try expect(S3.v0.s.s.v == 3);
|
|
try expect(S3.v0.s.s.s.bit0 == 0);
|
|
try expect(S3.v0.s.s.s.byte == 4);
|
|
try expect(S3.v0.s.s.s.bit1 == 1);
|
|
}
|
|
|
|
test "byte-aligned field pointer offsets" {
|
|
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; // TODO
|
|
if (builtin.zig_backend == .stage2_spirv64) return error.SkipZigTest;
|
|
|
|
const S = struct {
|
|
const A = packed struct {
|
|
a: u8,
|
|
b: u8,
|
|
c: u8,
|
|
d: u8,
|
|
};
|
|
|
|
const B = packed struct {
|
|
a: u16,
|
|
b: u16,
|
|
};
|
|
|
|
fn doTheTest() !void {
|
|
var a: A = .{
|
|
.a = 1,
|
|
.b = 2,
|
|
.c = 3,
|
|
.d = 4,
|
|
};
|
|
switch (comptime builtin.cpu.arch.endian()) {
|
|
.little => {
|
|
comptime assert(@TypeOf(&a.a) == *align(4) u8);
|
|
comptime assert(@TypeOf(&a.b) == *u8);
|
|
comptime assert(@TypeOf(&a.c) == *align(2) u8);
|
|
comptime assert(@TypeOf(&a.d) == *u8);
|
|
},
|
|
.big => {
|
|
// TODO re-evaluate packed struct endianness
|
|
comptime assert(@TypeOf(&a.a) == *align(4:0:4) u8);
|
|
comptime assert(@TypeOf(&a.b) == *align(4:8:4) u8);
|
|
comptime assert(@TypeOf(&a.c) == *align(4:16:4) u8);
|
|
comptime assert(@TypeOf(&a.d) == *align(4:24:4) u8);
|
|
},
|
|
}
|
|
try expect(a.a == 1);
|
|
try expect(a.b == 2);
|
|
try expect(a.c == 3);
|
|
try expect(a.d == 4);
|
|
|
|
a.a += 1;
|
|
try expect(a.a == 2);
|
|
try expect(a.b == 2);
|
|
try expect(a.c == 3);
|
|
try expect(a.d == 4);
|
|
|
|
a.b += 1;
|
|
try expect(a.a == 2);
|
|
try expect(a.b == 3);
|
|
try expect(a.c == 3);
|
|
try expect(a.d == 4);
|
|
|
|
a.c += 1;
|
|
try expect(a.a == 2);
|
|
try expect(a.b == 3);
|
|
try expect(a.c == 4);
|
|
try expect(a.d == 4);
|
|
|
|
a.d += 1;
|
|
try expect(a.a == 2);
|
|
try expect(a.b == 3);
|
|
try expect(a.c == 4);
|
|
try expect(a.d == 5);
|
|
|
|
var b: B = .{
|
|
.a = 1,
|
|
.b = 2,
|
|
};
|
|
switch (comptime builtin.cpu.arch.endian()) {
|
|
.little => {
|
|
comptime assert(@TypeOf(&b.a) == *align(4) u16);
|
|
comptime assert(@TypeOf(&b.b) == *u16);
|
|
},
|
|
.big => {
|
|
comptime assert(@TypeOf(&b.a) == *align(4:0:4) u16);
|
|
comptime assert(@TypeOf(&b.b) == *align(4:16:4) u16);
|
|
},
|
|
}
|
|
try expect(b.a == 1);
|
|
try expect(b.b == 2);
|
|
|
|
b.a += 1;
|
|
try expect(b.a == 2);
|
|
try expect(b.b == 2);
|
|
|
|
b.b += 1;
|
|
try expect(b.a == 2);
|
|
try expect(b.b == 3);
|
|
}
|
|
};
|
|
|
|
try S.doTheTest();
|
|
try comptime S.doTheTest();
|
|
}
|
|
|
|
test "nested packed struct field pointers" {
|
|
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; // TODO
|
|
if (builtin.zig_backend == .stage2_spirv64) return error.SkipZigTest;
|
|
if (builtin.zig_backend == .stage2_c) return error.SkipZigTest; // ubsan unaligned pointer access
|
|
if (native_endian != .little) return error.SkipZigTest; // Byte aligned packed struct field pointers have not been implemented yet
|
|
|
|
const S2 = packed struct {
|
|
base: u8,
|
|
p0: packed struct {
|
|
a: u4,
|
|
b: u4,
|
|
c: u8,
|
|
},
|
|
bit: u1,
|
|
p1: packed struct {
|
|
a: u7,
|
|
b: u8,
|
|
},
|
|
|
|
var s: @This() = .{ .base = 1, .p0 = .{ .a = 2, .b = 3, .c = 4 }, .bit = 0, .p1 = .{ .a = 5, .b = 6 } };
|
|
};
|
|
|
|
const ptr_base = &S2.s.base;
|
|
const ptr_p0_a = &S2.s.p0.a;
|
|
const ptr_p0_b = &S2.s.p0.b;
|
|
const ptr_p0_c = &S2.s.p0.c;
|
|
const ptr_p1_a = &S2.s.p1.a;
|
|
const ptr_p1_b = &S2.s.p1.b;
|
|
try expectEqual(@as(u8, 1), ptr_base.*);
|
|
try expectEqual(@as(u4, 2), ptr_p0_a.*);
|
|
try expectEqual(@as(u4, 3), ptr_p0_b.*);
|
|
try expectEqual(@as(u8, 4), ptr_p0_c.*);
|
|
try expectEqual(@as(u7, 5), ptr_p1_a.*);
|
|
try expectEqual(@as(u8, 6), ptr_p1_b.*);
|
|
}
|
|
|
|
test "load pointer from packed struct" {
|
|
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; // TODO
|
|
if (builtin.zig_backend == .stage2_spirv64) return error.SkipZigTest;
|
|
|
|
const A = struct {
|
|
index: u16,
|
|
};
|
|
const B = packed struct {
|
|
x: *A,
|
|
y: u32,
|
|
};
|
|
var a: A = .{ .index = 123 };
|
|
const b_list: []const B = &.{.{ .x = &a, .y = 99 }};
|
|
for (b_list) |b| {
|
|
try expect(b.x.index == 123);
|
|
}
|
|
}
|
|
|
|
test "@intFromPtr on a packed struct field" {
|
|
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; // TODO
|
|
if (builtin.zig_backend == .stage2_spirv64) return error.SkipZigTest;
|
|
if (native_endian != .little) return error.SkipZigTest;
|
|
|
|
const S = struct {
|
|
const P = packed struct {
|
|
x: u8,
|
|
y: u8,
|
|
z: u32,
|
|
};
|
|
|
|
var p0: P = P{
|
|
.x = 1,
|
|
.y = 2,
|
|
.z = 0,
|
|
};
|
|
};
|
|
try expect(@intFromPtr(&S.p0.z) - @intFromPtr(&S.p0.x) == 2);
|
|
}
|
|
|
|
test "@intFromPtr on a packed struct field unaligned and nested" {
|
|
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; // TODO
|
|
if (builtin.zig_backend == .stage2_spirv64) return error.SkipZigTest;
|
|
if (native_endian != .little) return error.SkipZigTest; // Byte aligned packed struct field pointers have not been implemented yet
|
|
|
|
const S1 = packed struct {
|
|
a: u4,
|
|
b: u4,
|
|
c: u8,
|
|
};
|
|
const S2 = packed struct {
|
|
base: u8,
|
|
p0: S1,
|
|
bit0: u1,
|
|
p1: packed struct {
|
|
a: u8,
|
|
},
|
|
p2: packed struct {
|
|
a: u7,
|
|
b: u8,
|
|
},
|
|
p3: S1,
|
|
|
|
var s: @This() = .{
|
|
.base = 1,
|
|
.p0 = .{ .a = 2, .b = 3, .c = 4 },
|
|
.bit0 = 0,
|
|
.p1 = .{ .a = 5 },
|
|
.p2 = .{ .a = 6, .b = 7 },
|
|
.p3 = .{ .a = 8, .b = 9, .c = 10 },
|
|
};
|
|
};
|
|
|
|
switch (comptime @alignOf(S2)) {
|
|
4 => {
|
|
comptime assert(@TypeOf(&S2.s.base) == *align(4) u8);
|
|
comptime assert(@TypeOf(&S2.s.p0.a) == *align(1:0:2) u4);
|
|
comptime assert(@TypeOf(&S2.s.p0.b) == *align(1:4:2) u4);
|
|
comptime assert(@TypeOf(&S2.s.p0.c) == *u8);
|
|
comptime assert(@TypeOf(&S2.s.bit0) == *align(4:24:8) u1);
|
|
comptime assert(@TypeOf(&S2.s.p1.a) == *align(4:25:8) u8);
|
|
comptime assert(@TypeOf(&S2.s.p2.a) == *align(4:33:8) u7);
|
|
comptime assert(@TypeOf(&S2.s.p2.b) == *u8);
|
|
comptime assert(@TypeOf(&S2.s.p3.a) == *align(2:0:2) u4);
|
|
comptime assert(@TypeOf(&S2.s.p3.b) == *align(2:4:2) u4);
|
|
comptime assert(@TypeOf(&S2.s.p3.c) == *u8);
|
|
},
|
|
8 => {
|
|
comptime assert(@TypeOf(&S2.s.base) == *align(8) u8);
|
|
comptime assert(@TypeOf(&S2.s.p0.a) == *align(1:0:2) u4);
|
|
comptime assert(@TypeOf(&S2.s.p0.b) == *align(1:4:2) u4);
|
|
comptime assert(@TypeOf(&S2.s.p0.c) == *u8);
|
|
comptime assert(@TypeOf(&S2.s.bit0) == *align(8:24:8) u1);
|
|
comptime assert(@TypeOf(&S2.s.p1.a) == *align(8:25:8) u8);
|
|
comptime assert(@TypeOf(&S2.s.p2.a) == *align(8:33:8) u7);
|
|
comptime assert(@TypeOf(&S2.s.p2.b) == *u8);
|
|
comptime assert(@TypeOf(&S2.s.p3.a) == *align(2:0:2) u4);
|
|
comptime assert(@TypeOf(&S2.s.p3.b) == *align(2:4:2) u4);
|
|
comptime assert(@TypeOf(&S2.s.p3.c) == *u8);
|
|
},
|
|
else => {},
|
|
}
|
|
try expect(@intFromPtr(&S2.s.base) - @intFromPtr(&S2.s) == 0);
|
|
try expect(@intFromPtr(&S2.s.p0.a) - @intFromPtr(&S2.s) == 1);
|
|
try expect(@intFromPtr(&S2.s.p0.b) - @intFromPtr(&S2.s) == 1);
|
|
try expect(@intFromPtr(&S2.s.p0.c) - @intFromPtr(&S2.s) == 2);
|
|
try expect(@intFromPtr(&S2.s.bit0) - @intFromPtr(&S2.s) == 0);
|
|
try expect(@intFromPtr(&S2.s.p1.a) - @intFromPtr(&S2.s) == 0);
|
|
try expect(@intFromPtr(&S2.s.p2.a) - @intFromPtr(&S2.s) == 0);
|
|
try expect(@intFromPtr(&S2.s.p2.b) - @intFromPtr(&S2.s) == 5);
|
|
try expect(@intFromPtr(&S2.s.p3.a) - @intFromPtr(&S2.s) == 6);
|
|
try expect(@intFromPtr(&S2.s.p3.b) - @intFromPtr(&S2.s) == 6);
|
|
try expect(@intFromPtr(&S2.s.p3.c) - @intFromPtr(&S2.s) == 7);
|
|
|
|
const S3 = packed struct {
|
|
pad: u8,
|
|
v: u2,
|
|
s: packed struct {
|
|
v: u3,
|
|
s: packed struct {
|
|
v: u2,
|
|
s: packed struct {
|
|
bit0: u1,
|
|
byte: u8,
|
|
bit1: u1,
|
|
},
|
|
},
|
|
},
|
|
var v0: @This() = .{ .pad = 0, .v = 1, .s = .{ .v = 2, .s = .{ .v = 3, .s = .{ .bit0 = 0, .byte = 4, .bit1 = 1 } } } };
|
|
};
|
|
|
|
comptime assert(@TypeOf(&S3.v0.v) == *align(4:8:4) u2);
|
|
comptime assert(@TypeOf(&S3.v0.s.v) == *align(4:10:4) u3);
|
|
comptime assert(@TypeOf(&S3.v0.s.s.v) == *align(4:13:4) u2);
|
|
comptime assert(@TypeOf(&S3.v0.s.s.s.bit0) == *align(4:15:4) u1);
|
|
comptime assert(@TypeOf(&S3.v0.s.s.s.byte) == *align(2) u8);
|
|
comptime assert(@TypeOf(&S3.v0.s.s.s.bit1) == *align(4:24:4) u1);
|
|
try expect(@intFromPtr(&S3.v0.v) - @intFromPtr(&S3.v0) == 0);
|
|
try expect(@intFromPtr(&S3.v0.s) - @intFromPtr(&S3.v0) == 0);
|
|
try expect(@intFromPtr(&S3.v0.s.v) - @intFromPtr(&S3.v0) == 0);
|
|
try expect(@intFromPtr(&S3.v0.s.s) - @intFromPtr(&S3.v0) == 0);
|
|
try expect(@intFromPtr(&S3.v0.s.s.v) - @intFromPtr(&S3.v0) == 0);
|
|
try expect(@intFromPtr(&S3.v0.s.s.s) - @intFromPtr(&S3.v0) == 0);
|
|
try expect(@intFromPtr(&S3.v0.s.s.s.bit0) - @intFromPtr(&S3.v0) == 0);
|
|
try expect(@intFromPtr(&S3.v0.s.s.s.byte) - @intFromPtr(&S3.v0) == 2);
|
|
try expect(@intFromPtr(&S3.v0.s.s.s.bit1) - @intFromPtr(&S3.v0) == 0);
|
|
}
|
|
|
|
test "packed struct fields modification" {
|
|
// Originally reported at https://github.com/ziglang/zig/issues/16615
|
|
if (builtin.zig_backend == .stage2_spirv64) return error.SkipZigTest;
|
|
|
|
const Small = packed struct {
|
|
val: u8 = 0,
|
|
lo: u4 = 0,
|
|
hi: u4 = 0,
|
|
|
|
var p: @This() = undefined;
|
|
};
|
|
Small.p = .{
|
|
.val = 0x12,
|
|
.lo = 3,
|
|
.hi = 4,
|
|
};
|
|
try expect(@as(u16, @bitCast(Small.p)) == 0x4312);
|
|
|
|
Small.p.val -= Small.p.lo;
|
|
Small.p.val += Small.p.hi;
|
|
Small.p.hi -= Small.p.lo;
|
|
try expect(@as(u16, @bitCast(Small.p)) == 0x1313);
|
|
}
|
|
|
|
test "optional pointer in packed struct" {
|
|
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; // TODO
|
|
if (builtin.zig_backend == .stage2_spirv64) return error.SkipZigTest;
|
|
|
|
const T = packed struct { ptr: ?*const u8 };
|
|
var n: u8 = 0;
|
|
const x = T{ .ptr = &n };
|
|
try expect(x.ptr.? == &n);
|
|
}
|
|
|
|
test "nested packed struct field access test" {
|
|
if (builtin.zig_backend == .stage2_c) return error.SkipZigTest; // TODO
|
|
if (builtin.zig_backend == .stage2_wasm) return error.SkipZigTest; // TODO packed structs larger than 64 bits
|
|
if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
|
|
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_spirv64) return error.SkipZigTest;
|
|
if (builtin.zig_backend == .stage2_x86_64 and builtin.target.ofmt != .elf) return error.SkipZigTest;
|
|
|
|
const Vec2 = packed struct {
|
|
x: f32,
|
|
y: f32,
|
|
};
|
|
|
|
const Vec3 = packed struct {
|
|
x: f32,
|
|
y: f32,
|
|
z: f32,
|
|
};
|
|
|
|
const NestedVec2 = packed struct {
|
|
nested: Vec2,
|
|
};
|
|
|
|
const NestedVec3 = packed struct {
|
|
nested: Vec3,
|
|
};
|
|
|
|
const vec2 = Vec2{
|
|
.x = 1.0,
|
|
.y = 2.0,
|
|
};
|
|
|
|
try std.testing.expectEqual(vec2.x, 1.0);
|
|
try std.testing.expectEqual(vec2.y, 2.0);
|
|
|
|
var vec2_o: Vec2 = undefined;
|
|
const vec2_o_ptr: *Vec2 = &vec2_o;
|
|
vec2_o_ptr.* = vec2;
|
|
|
|
try std.testing.expectEqual(vec2_o.x, 1.0);
|
|
try std.testing.expectEqual(vec2_o.y, 2.0);
|
|
|
|
const nested_vec2 = NestedVec2{
|
|
.nested = Vec2{
|
|
.x = 1.0,
|
|
.y = 2.0,
|
|
},
|
|
};
|
|
|
|
try std.testing.expectEqual(nested_vec2.nested.x, 1.0);
|
|
try std.testing.expectEqual(nested_vec2.nested.y, 2.0);
|
|
|
|
var nested_o: NestedVec2 = undefined;
|
|
const nested_o_ptr: *NestedVec2 = &nested_o;
|
|
nested_o_ptr.* = nested_vec2;
|
|
|
|
try std.testing.expectEqual(nested_o.nested.x, 1.0);
|
|
try std.testing.expectEqual(nested_o.nested.y, 2.0);
|
|
|
|
const vec3 = Vec3{
|
|
.x = 1.0,
|
|
.y = 2.0,
|
|
.z = 3.0,
|
|
};
|
|
|
|
try std.testing.expectEqual(vec3.x, 1.0);
|
|
try std.testing.expectEqual(vec3.y, 2.0);
|
|
try std.testing.expectEqual(vec3.z, 3.0);
|
|
|
|
var vec3_o: Vec3 = undefined;
|
|
const vec3_o_ptr: *Vec3 = &vec3_o;
|
|
vec3_o_ptr.* = vec3;
|
|
|
|
try std.testing.expectEqual(vec3_o.x, 1.0);
|
|
try std.testing.expectEqual(vec3_o.y, 2.0);
|
|
try std.testing.expectEqual(vec3_o.z, 3.0);
|
|
|
|
const nested_vec3 = NestedVec3{
|
|
.nested = Vec3{
|
|
.x = 1.0,
|
|
.y = 2.0,
|
|
.z = 3.0,
|
|
},
|
|
};
|
|
|
|
try std.testing.expectEqual(nested_vec3.nested.x, 1.0);
|
|
try std.testing.expectEqual(nested_vec3.nested.y, 2.0);
|
|
try std.testing.expectEqual(nested_vec3.nested.z, 3.0);
|
|
|
|
var nested_vec3_o: NestedVec3 = undefined;
|
|
const nested_vec3_o_ptr: *NestedVec3 = &nested_vec3_o;
|
|
nested_vec3_o_ptr.* = nested_vec3;
|
|
|
|
try std.testing.expectEqual(nested_vec3_o.nested.x, 1.0);
|
|
try std.testing.expectEqual(nested_vec3_o.nested.y, 2.0);
|
|
try std.testing.expectEqual(nested_vec3_o.nested.z, 3.0);
|
|
|
|
const hld = packed struct {
|
|
c: u64,
|
|
d: u32,
|
|
};
|
|
|
|
const mld = packed struct {
|
|
h: u64,
|
|
i: u64,
|
|
};
|
|
|
|
const a = packed struct {
|
|
b: hld,
|
|
g: mld,
|
|
};
|
|
|
|
var arg = a{ .b = hld{ .c = 1, .d = 2 }, .g = mld{ .h = 6, .i = 8 } };
|
|
_ = &arg;
|
|
try std.testing.expect(arg.b.c == 1);
|
|
try std.testing.expect(arg.b.d == 2);
|
|
try std.testing.expect(arg.g.h == 6);
|
|
try std.testing.expect(arg.g.i == 8);
|
|
}
|
|
|
|
test "nested packed struct at non-zero offset" {
|
|
if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
|
|
if (builtin.zig_backend == .stage2_spirv64) return error.SkipZigTest;
|
|
|
|
const Pair = packed struct(u24) {
|
|
a: u16 = 0,
|
|
b: u8 = 0,
|
|
};
|
|
const A = packed struct {
|
|
p1: Pair,
|
|
p2: Pair,
|
|
};
|
|
|
|
var k: u8 = 123;
|
|
_ = &k;
|
|
var v: A = .{
|
|
.p1 = .{ .a = k + 1, .b = k },
|
|
.p2 = .{ .a = k + 1, .b = k },
|
|
};
|
|
|
|
try expect(v.p1.a == k + 1 and v.p1.b == k);
|
|
try expect(v.p2.a == k + 1 and v.p2.b == k);
|
|
|
|
v.p2.a -= v.p1.a;
|
|
v.p2.b -= v.p1.b;
|
|
try expect(v.p2.a == 0 and v.p2.b == 0);
|
|
try expect(v.p1.a == k + 1 and v.p1.b == k);
|
|
}
|
|
|
|
test "nested packed struct at non-zero offset 2" {
|
|
if (builtin.zig_backend == .stage2_x86_64) return error.SkipZigTest; // TODO
|
|
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; // TODO
|
|
if (builtin.zig_backend == .stage2_spirv64) return error.SkipZigTest;
|
|
if (builtin.zig_backend == .stage2_wasm) return error.SkipZigTest; // TODO packed structs larger than 64 bits
|
|
if (builtin.zig_backend == .stage2_c) return error.SkipZigTest;
|
|
|
|
const S = struct {
|
|
const Pair = packed struct(u40) {
|
|
a: u32 = 0,
|
|
b: u8 = 0,
|
|
};
|
|
const A = packed struct {
|
|
p1: Pair,
|
|
p2: Pair,
|
|
c: C,
|
|
};
|
|
const C = packed struct {
|
|
p1: Pair,
|
|
pad1: u5,
|
|
p2: Pair,
|
|
pad2: u3,
|
|
last: i16,
|
|
};
|
|
|
|
fn doTheTest() !void {
|
|
var k: u8 = 123;
|
|
_ = &k;
|
|
var v: A = .{
|
|
.p1 = .{ .a = k + 1, .b = k },
|
|
.p2 = .{ .a = k + 1, .b = k },
|
|
.c = .{
|
|
.pad1 = 11,
|
|
.pad2 = 2,
|
|
.p1 = .{ .a = k + 1, .b = k },
|
|
.p2 = .{ .a = k + 1, .b = k },
|
|
.last = -12345,
|
|
},
|
|
};
|
|
|
|
try expect(v.p1.a == k + 1 and v.p1.b == k);
|
|
try expect(v.p2.a == k + 1 and v.p2.b == k);
|
|
try expect(v.c.p2.a == k + 1 and v.c.p2.b == k);
|
|
try expect(v.c.p2.a == k + 1 and v.c.p2.b == k);
|
|
try expect(v.c.last == -12345);
|
|
try expect(v.c.pad1 == 11 and v.c.pad2 == 2);
|
|
|
|
v.p2.a -= v.p1.a;
|
|
v.p2.b -= v.p1.b;
|
|
v.c.p2.a -= v.c.p1.a;
|
|
v.c.p2.b -= v.c.p1.b;
|
|
v.c.last -|= 32000;
|
|
try expect(v.p2.a == 0 and v.p2.b == 0);
|
|
try expect(v.p1.a == k + 1 and v.p1.b == k);
|
|
try expect(v.c.p2.a == 0 and v.c.p2.b == 0);
|
|
try expect(v.c.p1.a == k + 1 and v.c.p1.b == k);
|
|
try expect(v.c.last == -32768);
|
|
try expect(v.c.pad1 == 11 and v.c.pad2 == 2);
|
|
}
|
|
};
|
|
|
|
try S.doTheTest();
|
|
try comptime S.doTheTest();
|
|
}
|
|
|
|
test "runtime init of unnamed packed struct type" {
|
|
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; // TODO
|
|
if (builtin.zig_backend == .stage2_spirv64) return error.SkipZigTest;
|
|
|
|
var z: u8 = 123;
|
|
_ = &z;
|
|
try (packed struct {
|
|
x: u8,
|
|
pub fn m(s: @This()) !void {
|
|
try expect(s.x == 123);
|
|
}
|
|
}{ .x = z }).m();
|
|
}
|
|
|
|
test "packed struct passed to callconv(.C) function" {
|
|
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; // TODO
|
|
if (builtin.zig_backend == .stage2_spirv64) return error.SkipZigTest;
|
|
|
|
const S = struct {
|
|
const Packed = packed struct {
|
|
a: u16,
|
|
b: bool = true,
|
|
c: bool = true,
|
|
d: u46 = 0,
|
|
};
|
|
|
|
fn foo(p: Packed, a1: u64, a2: u64, a3: u64, a4: u64, a5: u64) callconv(.C) bool {
|
|
return p.a == 12345 and p.b == true and p.c == true and p.d == 0 and a1 == 5 and a2 == 4 and a3 == 3 and a4 == 2 and a5 == 1;
|
|
}
|
|
};
|
|
const result = S.foo(S.Packed{
|
|
.a = 12345,
|
|
.b = true,
|
|
.c = true,
|
|
}, 5, 4, 3, 2, 1);
|
|
try expect(result);
|
|
}
|
|
|
|
test "overaligned pointer to packed struct" {
|
|
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; // TODO
|
|
if (builtin.zig_backend == .stage2_spirv64) return error.SkipZigTest;
|
|
|
|
const S = packed struct { a: u32, b: u32 };
|
|
var foo: S align(4) = .{ .a = 123, .b = 456 };
|
|
const ptr: *align(4) S = &foo;
|
|
switch (comptime builtin.cpu.arch.endian()) {
|
|
.little => {
|
|
const ptr_to_b: *u32 = &ptr.b;
|
|
try expect(ptr_to_b.* == 456);
|
|
},
|
|
.big => {
|
|
// Byte aligned packed struct field pointers have not been implemented yet.
|
|
const ptr_to_a: *align(4:0:8) u32 = &ptr.a;
|
|
try expect(ptr_to_a.* == 123);
|
|
},
|
|
}
|
|
}
|
|
|
|
test "packed struct initialized in bitcast" {
|
|
if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
|
|
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_spirv64) return error.SkipZigTest;
|
|
|
|
const T = packed struct { val: u8 };
|
|
var val: u8 = 123;
|
|
_ = &val;
|
|
const t = @as(u8, @bitCast(T{ .val = val }));
|
|
try expect(t == val);
|
|
}
|
|
|
|
test "pointer to container level packed struct field" {
|
|
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; // TODO
|
|
if (builtin.zig_backend == .stage2_spirv64) return error.SkipZigTest;
|
|
|
|
const S = packed struct(u32) {
|
|
test_bit: bool,
|
|
someother_data: u12,
|
|
other_test_bit: bool,
|
|
someother_more_different_data: u12,
|
|
other_bits: packed struct(u6) {
|
|
enable_1: bool,
|
|
enable_2: bool,
|
|
enable_3: bool,
|
|
enable_4: bool,
|
|
enable_5: bool,
|
|
enable_6: bool,
|
|
},
|
|
var arr = [_]u32{0} ** 2;
|
|
};
|
|
@as(*S, @ptrCast(&S.arr[0])).other_bits.enable_3 = true;
|
|
try expect(S.arr[0] == 0x10000000);
|
|
}
|
|
|
|
test "store undefined to packed result location" {
|
|
if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
|
|
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;
|
|
if (builtin.zig_backend == .stage2_spirv64) return error.SkipZigTest;
|
|
|
|
var x: u4 = 0;
|
|
_ = &x;
|
|
const s = packed struct { x: u4, y: u4 }{ .x = x, .y = if (x > 0) x else undefined };
|
|
try expectEqual(x, s.x);
|
|
}
|
|
|
|
test "bitcast back and forth" {
|
|
if (builtin.zig_backend == .stage2_spirv64) return error.SkipZigTest;
|
|
|
|
// Originally reported at https://github.com/ziglang/zig/issues/9914
|
|
const S = packed struct { one: u6, two: u1 };
|
|
const s = S{ .one = 0b110101, .two = 0b1 };
|
|
const u: u7 = @bitCast(s);
|
|
const s2: S = @bitCast(u);
|
|
try expect(s.one == s2.one);
|
|
try expect(s.two == s2.two);
|
|
}
|
|
|
|
test "field access of packed struct smaller than its abi size inside struct initialized with rls" {
|
|
// Originally reported at https://github.com/ziglang/zig/issues/14200
|
|
if (builtin.zig_backend == .stage2_spirv64) return error.SkipZigTest;
|
|
|
|
const S = struct {
|
|
ps: packed struct { x: i2, y: i2 },
|
|
|
|
fn init(cond: bool) @This() {
|
|
return .{ .ps = .{ .x = 0, .y = if (cond) 1 else 0 } };
|
|
}
|
|
};
|
|
|
|
const s = S.init(true);
|
|
// note: this bug is triggered by the == operator, expectEqual will hide it
|
|
try expect(@as(i2, 0) == s.ps.x);
|
|
try expect(@as(i2, 1) == s.ps.y);
|
|
}
|
|
|
|
test "modify nested packed struct aligned field" {
|
|
// Originally reported at https://github.com/ziglang/zig/issues/14632
|
|
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_spirv64) return error.SkipZigTest;
|
|
|
|
const Options = packed struct {
|
|
foo: bool = false,
|
|
bar: bool = false,
|
|
pretty_print: packed struct {
|
|
enabled: bool = false,
|
|
num_spaces: u4 = 4,
|
|
space_char: enum { space, tab } = .space,
|
|
indent: u8 = 0,
|
|
} = .{},
|
|
baz: bool = false,
|
|
};
|
|
|
|
var opts = Options{};
|
|
opts.pretty_print.indent += 1;
|
|
try std.testing.expectEqual(@as(u17, 0b00000000100100000), @bitCast(opts));
|
|
try std.testing.expect(!opts.foo);
|
|
try std.testing.expect(!opts.bar);
|
|
try std.testing.expect(!opts.pretty_print.enabled);
|
|
try std.testing.expectEqual(@as(u4, 4), opts.pretty_print.num_spaces);
|
|
try std.testing.expectEqual(@as(u8, 1), opts.pretty_print.indent);
|
|
try std.testing.expect(!opts.baz);
|
|
}
|
|
|
|
test "assigning packed struct inside another packed struct" {
|
|
// Originally reported at https://github.com/ziglang/zig/issues/9674
|
|
if (builtin.zig_backend == .stage2_spirv64) return error.SkipZigTest;
|
|
|
|
const S = struct {
|
|
const Inner = packed struct {
|
|
bits: u3,
|
|
more_bits: u6,
|
|
};
|
|
|
|
const Outer = packed struct {
|
|
padding: u5,
|
|
inner: Inner,
|
|
};
|
|
fn t(inner: Inner) void {
|
|
r.inner = inner;
|
|
}
|
|
|
|
var mem: Outer = undefined;
|
|
var r: *volatile Outer = &mem;
|
|
};
|
|
|
|
const val = S.Inner{ .bits = 1, .more_bits = 11 };
|
|
S.mem.padding = 0;
|
|
S.t(val);
|
|
|
|
try expectEqual(val, S.mem.inner);
|
|
try expect(S.mem.padding == 0);
|
|
}
|