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Add a pointer to address cast kind

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A pointer to address cast are often special-cased.
Introduce a dedicated cast kind to make them easy distinguishable.
This commit is contained in:
Tomasz Miąsko 2022-05-31 00:00:00 +00:00
parent 2f250783b1
commit 4e45960abc
1 changed files with 5 additions and 10 deletions
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15
clippy_utils/src/qualify_min_const_fn.rs
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@ -125,16 +125,11 @@ fn check_rvalue<'tcx>(
Rvalue::Len(place) | Rvalue::Discriminant(place) | Rvalue::Ref(_, _, place) | Rvalue::AddressOf(_, place) => {
check_place(tcx, *place, span, body)
},
Rvalue::Cast(CastKind::Misc, operand, cast_ty) => {
use rustc_middle::ty::cast::CastTy;
let cast_in = CastTy::from_ty(operand.ty(body, tcx)).expect("bad input type for cast");
let cast_out = CastTy::from_ty(*cast_ty).expect("bad output type for cast");
match (cast_in, cast_out) {
(CastTy::Ptr(_) | CastTy::FnPtr, CastTy::Int(_)) => {
Err((span, "casting pointers to ints is unstable in const fn".into()))
},
_ => check_operand(tcx, operand, span, body),
}
Rvalue::Cast(CastKind::PointerAddress, _, _) => {
Err((span, "casting pointers to ints is unstable in const fn".into()))
},
Rvalue::Cast(CastKind::Misc, operand, _) => {
check_operand(tcx, operand, span, body)
},
Rvalue::Cast(CastKind::Pointer(PointerCast::MutToConstPointer | PointerCast::ArrayToPointer), operand, _) => {
check_operand(tcx, operand, span, body)