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https://github.com/ziglang/zig.git
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62d178e91a
* add nested packed struct/union behavior tests * use ptr_info.packed_offset rather than trying to duplicate the logic from Sema.structFieldPtrByIndex() * use the container_ptr_info.packed_offset to account for non-aligned nested structs. * dedup type.packedStructFieldBitOffset() and module.structPackedFieldBitOffset()
88 lines
3.1 KiB
Zig
88 lines
3.1 KiB
Zig
const std = @import("std");
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const builtin = @import("builtin");
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const expectEqual = std.testing.expectEqual;
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test "flags in packed union" {
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if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
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if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;
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if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest;
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if (builtin.zig_backend == .stage2_spirv64) return error.SkipZigTest;
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const FlagBits = packed struct(u8) {
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enable_1: bool = false,
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enable_2: bool = false,
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enable_3: bool = false,
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enable_4: bool = false,
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other_flags: packed union {
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flags: packed struct(u4) {
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enable_1: bool = true,
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enable_2: bool = false,
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enable_3: bool = false,
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enable_4: bool = false,
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},
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bits: u4,
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} = .{ .flags = .{} },
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};
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var test_bits: FlagBits = .{};
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try expectEqual(false, test_bits.enable_1);
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try expectEqual(true, test_bits.other_flags.flags.enable_1);
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test_bits.enable_1 = true;
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try expectEqual(true, test_bits.enable_1);
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try expectEqual(true, test_bits.other_flags.flags.enable_1);
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test_bits.other_flags.flags.enable_1 = false;
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try expectEqual(true, test_bits.enable_1);
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try expectEqual(false, test_bits.other_flags.flags.enable_1);
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}
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test "flags in packed union at offset" {
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if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
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if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;
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if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest;
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if (builtin.zig_backend == .stage2_spirv64) return error.SkipZigTest;
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const FlagBits = packed union {
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base_flags: packed union {
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flags: packed struct(u4) {
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enable_1: bool = true,
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enable_2: bool = false,
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enable_3: bool = false,
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enable_4: bool = false,
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},
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bits: u4,
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},
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adv_flags: packed struct(u12) {
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pad: u8 = 0,
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adv: packed union {
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flags: packed struct(u4) {
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enable_1: bool = true,
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enable_2: bool = false,
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enable_3: bool = false,
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enable_4: bool = false,
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},
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bits: u4,
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},
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},
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};
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var test_bits: FlagBits = .{ .adv_flags = .{ .adv = .{ .flags = .{} } } };
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try expectEqual(@as(u8, 0), test_bits.adv_flags.pad);
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try expectEqual(true, test_bits.adv_flags.adv.flags.enable_1);
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try expectEqual(false, test_bits.adv_flags.adv.flags.enable_2);
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test_bits.adv_flags.adv.flags.enable_1 = false;
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test_bits.adv_flags.adv.flags.enable_2 = true;
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try expectEqual(@as(u8, 0), test_bits.adv_flags.pad);
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try expectEqual(false, test_bits.adv_flags.adv.flags.enable_1);
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try expectEqual(true, test_bits.adv_flags.adv.flags.enable_2);
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test_bits.adv_flags.adv.bits = 12;
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try expectEqual(@as(u8, 0), test_bits.adv_flags.pad);
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try expectEqual(false, test_bits.adv_flags.adv.flags.enable_1);
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try expectEqual(false, test_bits.adv_flags.adv.flags.enable_2);
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}
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