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llvm: fix lowering packed union initiated to zero-bit value

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Closes #14980
This commit is contained in:
Veikka Tuominen 2023-03-20 18:05:52 +02:00
parent 0c16912733
commit 773b1c4c5c
2 changed files with 22 additions and 0 deletions
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2
src/codegen/llvm.zig
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@ -3815,6 +3815,8 @@ pub const DeclGen = struct {
const field_ty = union_obj.fields.values()[field_index].ty;
if (union_obj.layout == .Packed) {
if (!field_ty.hasRuntimeBits())
return llvm_union_ty.constNull();
const non_int_val = try lowerValue(dg, .{ .ty = field_ty, .val = tag_and_val.val });
const ty_bit_size = @intCast(u16, field_ty.bitSize(target));
const small_int_ty = dg.context.intType(ty_bit_size);

20
test/behavior/union.zig
View File

@ -1493,3 +1493,23 @@ test "union reassignment can use previous value" {
a = U{ .b = a.a };
try expect(a.b == 32);
}
test "packed union with zero-bit field" {
if (builtin.zig_backend == .stage2_x86_64) return error.SkipZigTest; // TODO
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_wasm) return error.SkipZigTest; // TODO
const S = packed struct {
nested: packed union {
zero: void,
sized: u32,
},
bar: u32,
fn doTest(self: @This()) !void {
try expect(self.bar == 42);
}
};
try S.doTest(.{ .nested = .{ .zero = {} }, .bar = 42 });
}