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Check pointer metadata rather than pointee size

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This commit is contained in:
Caleb Zulawski 2022-08-27 13:35:18 +00:00
parent d00928aa69
commit 3f2ce0624d
1 changed files with 14 additions and 10 deletions
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24
compiler/rustc_codegen_llvm/src/intrinsic.rs
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@ -1718,19 +1718,23 @@ macro_rules! bitwise_red {
);
match in_elem.kind() {
ty::RawPtr(p) => require!(
p.ty.is_sized(bx.tcx.at(span), ty::ParamEnv::reveal_all()),
"cannot cast pointer to unsized type `{}`",
in_elem
),
ty::RawPtr(p) => {
let (metadata, check_sized) = p.ty.ptr_metadata_ty(bx.tcx, |ty| {
bx.tcx.normalize_erasing_regions(ty::ParamEnv::reveal_all(), ty)
});
assert!(!check_sized); // we are in codegen, so we shouldn't see these types
require!(metadata.is_unit(), "cannot cast fat pointer `{}`", in_elem)
}
_ => return_error!("expected pointer, got `{}`", in_elem),
}
match out_elem.kind() {
ty::RawPtr(p) => require!(
p.ty.is_sized(bx.tcx.at(span), ty::ParamEnv::reveal_all()),
"cannot cast to pointer to unsized type `{}`",
out_elem
),
ty::RawPtr(p) => {
let (metadata, check_sized) = p.ty.ptr_metadata_ty(bx.tcx, |ty| {
bx.tcx.normalize_erasing_regions(ty::ParamEnv::reveal_all(), ty)
});
assert!(!check_sized); // we are in codegen, so we shouldn't see these types
require!(metadata.is_unit(), "cannot cast to fat pointer `{}`", out_elem)
}
_ => return_error!("expected pointer, got `{}`", out_elem),
}