bjoernager/rust
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Make Ty::boxed_ty return an Option

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This commit is contained in:
Pavel Grigorenko 2024-09-05 00:34:04 +03:00
parent 842d6fc32e
commit f6e8a84eea
21 changed files with 58 additions and 48 deletions
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6
compiler/rustc_middle/src/ty/layout.rs
View file

@ -1075,11 +1075,13 @@ where
// the raw pointer, so size and align are set to the boxed type, but `pointee.safe`
// will still be `None`.
if let Some(ref mut pointee) = result {
if offset.bytes() == 0 && this.ty.is_box() {
if offset.bytes() == 0
&& let Some(boxed_ty) = this.ty.boxed_ty()
{
debug_assert!(pointee.safe.is_none());
let optimize = tcx.sess.opts.optimize != OptLevel::No;
pointee.safe = Some(PointerKind::Box {
unpin: optimize && this.ty.boxed_ty().is_unpin(tcx, cx.param_env()),
unpin: optimize && boxed_ty.is_unpin(tcx, cx.param_env()),
global: this.ty.is_box_global(tcx),
});
}

15
compiler/rustc_middle/src/ty/sty.rs
View file

@ -1170,14 +1170,19 @@ impl<'tcx> Ty<'tcx> {
}
}
/// Panics if called on any type other than `Box<T>`.
pub fn boxed_ty(self) -> Ty<'tcx> {
pub fn boxed_ty(self) -> Option<Ty<'tcx>> {
match self.kind() {
Adt(def, args) if def.is_box() => args.type_at(0),
_ => bug!("`boxed_ty` is called on non-box type {:?}", self),
Adt(def, args) if def.is_box() => Some(args.type_at(0)),
_ => None,
}
}
/// Panics if called on any type other than `Box<T>`.
pub fn expect_boxed_ty(self) -> Ty<'tcx> {
self.boxed_ty()
.unwrap_or_else(|| bug!("`expect_boxed_ty` is called on non-box type {:?}", self))
}
/// A scalar type is one that denotes an atomic datum, with no sub-components.
/// (A RawPtr is scalar because it represents a non-managed pointer, so its
/// contents are abstract to rustc.)
@ -1323,7 +1328,7 @@ impl<'tcx> Ty<'tcx> {
/// Some types -- notably unsafe ptrs -- can only be dereferenced explicitly.
pub fn builtin_deref(self, explicit: bool) -> Option<Ty<'tcx>> {
match *self.kind() {
Adt(def, _) if def.is_box() => Some(self.boxed_ty()),
_ if let Some(boxed) = self.boxed_ty() => Some(boxed),
Ref(_, ty, _) => Some(ty),
RawPtr(ty, _) if explicit => Some(ty),
_ => None,

2
compiler/rustc_middle/src/ty/util.rs
View file

@ -1628,7 +1628,7 @@ impl<'tcx> ExplicitSelf<'tcx> {
_ if is_self_ty(self_arg_ty) => ByValue,
ty::Ref(region, ty, mutbl) if is_self_ty(ty) => ByReference(region, mutbl),
ty::RawPtr(ty, mutbl) if is_self_ty(ty) => ByRawPointer(mutbl),
ty::Adt(def, _) if def.is_box() && is_self_ty(self_arg_ty.boxed_ty()) => ByBox,
_ if self_arg_ty.boxed_ty().is_some_and(is_self_ty) => ByBox,
_ => Other,
}
}