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Sema: disallow casting to opaque

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fmaggi 2024-07-15 04:58:33 -03:00 • committed by GitHub
parent d404d8a363
commit 583e698256
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GPG key ID: B5690EEEBB952194
2 changed files with 13 additions and 8 deletions
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6
src/Sema.zig
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@ -10188,9 +10188,15 @@ fn analyzeAs(
const dest_ty_tag = dest_ty.zigTypeTagOrPoison(mod) catch |err| switch (err) {
error.GenericPoison => return operand,
};
if (dest_ty_tag == .Opaque) {
return sema.fail(block, src, "cannot cast to opaque type '{}'", .{dest_ty.fmt(pt)});
}
if (dest_ty_tag == .NoReturn) {
return sema.fail(block, src, "cannot cast to noreturn", .{});
}
const is_ret = if (zir_dest_type.toIndex()) |ptr_index|
sema.code.instructions.items(.tag)[@intFromEnum(ptr_index)] == .ret_type
else

15
test/cases/compile_errors/directly_embedding_opaque_type_in_struct_and_union.zig
View file

@ -15,14 +15,13 @@ export fn b() void {
_ = &bar;
}
export fn c() void {
const baz = &@as(O, undefined);
const qux = .{baz.*};
_ = qux;
const baz = @as(O, undefined);
_ = baz;
}
export fn d() void {
const baz = &@as(O, undefined);
const qux = .{ .a = baz.* };
_ = qux;
const ptr: *O = @ptrFromInt(0x1000);
const x = .{ptr.*};
_ = x;
}
// error
@ -33,7 +32,7 @@ export fn d() void {
// :1:11: note: opaque declared here
// :7:10: error: opaque types have unknown size and therefore cannot be directly embedded in unions
// :1:11: note: opaque declared here
// :19:22: error: cannot load opaque type 'tmp.O'
// :18:24: error: cannot cast to opaque type 'tmp.O'
// :1:11: note: opaque declared here
// :24:28: error: cannot load opaque type 'tmp.O'
// :23:20: error: cannot load opaque type 'tmp.O'
// :1:11: note: opaque declared here