bjoernager/rust
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Fix bitcast with different sizes

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This commit is contained in:
Antoni Boucher 2023-10-09 08:28:06 -04:00
parent 237be9e0cb
commit bd7e5b9d4e
1 changed files with 9 additions and 1 deletions
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10
src/type_of.rs
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@ -182,6 +182,7 @@ impl<'tcx> LayoutGccExt<'tcx> for TyAndLayout<'tcx> {
/// of that field's type - this is useful for taking the address of
/// that field and ensuring the struct has the right alignment.
fn gcc_type<'gcc>(&self, cx: &CodegenCx<'gcc, 'tcx>) -> Type<'gcc> {
use crate::rustc_middle::ty::layout::FnAbiOf;
// This must produce the same result for `repr(transparent)` wrappers as for the inner type!
// In other words, this should generally not look at the type at all, but only at the
// layout.
@ -191,7 +192,14 @@ impl<'tcx> LayoutGccExt<'tcx> for TyAndLayout<'tcx> {
if let Some(&ty) = cx.scalar_types.borrow().get(&self.ty) {
return ty;
}
let ty = self.scalar_gcc_type_at(cx, scalar, Size::ZERO);
let ty =
match *self.ty.kind() {
// NOTE: we cannot remove this match like in the LLVM codegen because the call
// to fn_ptr_backend_type handle the on-stack attribute.
// TODO(antoyo): find a less hackish way to hande the on-stack attribute.
ty::FnPtr(sig) => cx.fn_ptr_backend_type(&cx.fn_abi_of_fn_ptr(sig, ty::List::empty())),
_ => self.scalar_gcc_type_at(cx, scalar, Size::ZERO),
};
cx.scalar_types.borrow_mut().insert(self.ty, ty);
return ty;
}