mirror of
https://github.com/ziglang/zig.git
synced 2025-12-06 06:13:07 +00:00
1b672e41c5
This changeset fixes the handling of alignment in several places. The new rules are: * `@alignOf(T)` where `T` is a runtime zero-bit type is at least 1, maybe greater. * Zero-bit fields in `extern` structs *do* force alignment, potentially offsetting following fields. * Zero-bit fields *do* have addresses within structs which can be observed and are consistent with `@offsetOf`. These are not necessarily all implemented correctly yet (see disabled test), but this commit fixes all regressions compared to master, and makes one new test pass.
70 lines
1.6 KiB
Zig
70 lines
1.6 KiB
Zig
const builtin = @import("builtin");
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const std = @import("std");
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const expect = std.testing.expect;
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test "switch on empty enum" {
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const E = enum {};
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var e: E = undefined;
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switch (e) {}
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}
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test "switch on empty enum with a specified tag type" {
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if (builtin.zig_backend == .stage2_spirv64) return error.SkipZigTest;
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const E = enum(u8) {};
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var e: E = undefined;
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switch (e) {}
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}
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test "switch on empty auto numbered tagged union" {
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if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
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if (builtin.zig_backend == .stage2_spirv64) return error.SkipZigTest;
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const U = union(enum(u8)) {};
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var u: U = undefined;
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switch (u) {}
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}
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test "switch on empty tagged union" {
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if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
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const E = enum {};
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const U = union(E) {};
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var u: U = undefined;
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switch (u) {}
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}
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test "empty union" {
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const U = union {};
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try expect(@sizeOf(U) == 0);
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try expect(@alignOf(U) == 1);
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}
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test "empty extern union" {
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const U = extern union {};
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try expect(@sizeOf(U) == 0);
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try expect(@alignOf(U) == 1);
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}
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test "empty union passed as argument" {
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if (builtin.zig_backend == .stage2_spirv64) return error.SkipZigTest;
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const U = union(enum) {
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fn f(u: @This()) void {
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switch (u) {}
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}
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};
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U.f(@as(U, undefined));
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}
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test "empty enum passed as argument" {
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if (builtin.zig_backend == .stage2_spirv64) return error.SkipZigTest;
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const E = enum {
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fn f(e: @This()) void {
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switch (e) {}
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}
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};
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E.f(@as(E, undefined));
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}
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