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e6ebdcb82e
Without the packed qualifier, the type layout that we use to initialize doesn't match the correct layout of the underlying storage, causing corrupted data and past-the-end writes.
30 lines
847 B
Zig
30 lines
847 B
Zig
const std = @import("std");
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const builtin = @import("builtin");
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const expect = std.testing.expect;
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const U = union(enum) {
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x: u128,
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y: [17]u8,
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};
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fn foo(val: U) !void {
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try expect(val.x == 1);
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}
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test "runtime union init, most-aligned field != largest" {
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if (builtin.zig_backend == .stage2_c) 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_aarch64) 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_wasm) return error.SkipZigTest; // TODO
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var x: u8 = 1;
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try foo(.{ .x = x });
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const val: U = @unionInit(U, "x", x);
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try expect(val.x == 1);
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const val2: U = .{ .x = x };
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try expect(val2.x == 1);
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}
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