diff options
| -rw-r--r-- | compiler/rustc_codegen_ssa/src/base.rs | 8 | ||||
| -rw-r--r-- | tests/ui/dyn-star/llvm-old-style-ptrs.rs | 23 |
2 files changed, 31 insertions, 0 deletions
diff --git a/compiler/rustc_codegen_ssa/src/base.rs b/compiler/rustc_codegen_ssa/src/base.rs index 229e3d9dc5f..4e13d4dbcb7 100644 --- a/compiler/rustc_codegen_ssa/src/base.rs +++ b/compiler/rustc_codegen_ssa/src/base.rs @@ -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)) } diff --git a/tests/ui/dyn-star/llvm-old-style-ptrs.rs b/tests/ui/dyn-star/llvm-old-style-ptrs.rs new file mode 100644 index 00000000000..d35519632be --- /dev/null +++ b/tests/ui/dyn-star/llvm-old-style-ptrs.rs @@ -0,0 +1,23 @@ +// run-pass +// compile-flags: -Copt-level=0 -Cllvm-args=-opaque-pointers=0 + +// (opaque-pointers flag is called force-opaque-pointers in LLVM 13...) +// min-llvm-version: 14.0 + +// This test can be removed once non-opaque pointers are gone from LLVM, maybe. + +#![feature(dyn_star, pointer_like_trait)] +#![allow(incomplete_features)] + +use std::fmt::Debug; +use std::marker::PointerLike; + +fn make_dyn_star<'a>(t: impl PointerLike + Debug + 'a) -> dyn* Debug + 'a { + t as _ +} + +fn main() { + println!("{:?}", make_dyn_star(Box::new(1i32))); + println!("{:?}", make_dyn_star(2usize)); + println!("{:?}", make_dyn_star((3usize,))); +} |