bjoernager/rust
bjoernager/rust
1
Fork 0
Code Activity

Use inttoptr to support usize as dyn* value, use pointercast to make sure pointers are compatible

Browse source
This commit is contained in:
Michael Goulet 2023-02-07 19:17:04 +00:00
parent 88e39ee314
commit df52e2037a
2 changed files with 31 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

8
compiler/rustc_codegen_ssa/src/base.rs
View file

@ -273,6 +273,14 @@ pub fn cast_to_dyn_star<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
matches!(dst_ty.kind(), ty::Dynamic(_, _, ty::DynStar)),
"destination type must be a dyn*"
);
// FIXME(dyn-star): We can remove this when all supported LLVMs use opaque ptrs only.
let unit_ptr = bx.cx().type_ptr_to(bx.cx().type_struct(&[], false));
let src = match bx.cx().type_kind(bx.cx().backend_type(src_ty_and_layout)) {
TypeKind::Pointer => bx.pointercast(src, unit_ptr),
TypeKind::Integer => bx.inttoptr(src, unit_ptr),
// FIXME(dyn-star): We probably have to do a bitcast first, then inttoptr.
kind => bug!("unexpected TypeKind for left-hand side of `dyn*` cast: {kind:?}"),
};
(src, unsized_info(bx, src_ty_and_layout.ty, dst_ty, old_info))
}