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Add IS_MANUALLY_DROP to AdtFlags

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This commit is contained in:
Matthew Jasper 2020-01-30 20:26:36 +00:00
parent 570c1613c1
commit 39733223fc
1 changed files with 17 additions and 5 deletions
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22
src/librustc/ty/mod.rs
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@ -1792,19 +1792,22 @@ bitflags! {
const IS_STRUCT = 1 << 2;
/// Indicates whether the ADT is a struct and has a constructor.
const HAS_CTOR = 1 << 3;
/// Indicates whether the type is a `PhantomData`.
/// Indicates whether the type is `PhantomData`.
const IS_PHANTOM_DATA = 1 << 4;
/// Indicates whether the type has a `#[fundamental]` attribute.
const IS_FUNDAMENTAL = 1 << 5;
/// Indicates whether the type is a `Box`.
/// Indicates whether the type is `Box`.
const IS_BOX = 1 << 6;
/// Indicates whether the type is `ManuallyDrop`.
const IS_MANUALLY_DROP = 1 << 7;
// FIXME(matthewjasper) replace these with diagnostic items
/// Indicates whether the type is an `Arc`.
const IS_ARC = 1 << 7;
const IS_ARC = 1 << 8;
/// Indicates whether the type is an `Rc`.
const IS_RC = 1 << 8;
const IS_RC = 1 << 9;
/// Indicates whether the variant list of this ADT is `#[non_exhaustive]`.
/// (i.e., this flag is never set unless this ADT is an enum).
const IS_VARIANT_LIST_NON_EXHAUSTIVE = 1 << 9;
const IS_VARIANT_LIST_NON_EXHAUSTIVE = 1 << 10;
}
}
@ -2180,6 +2183,9 @@ impl<'tcx> AdtDef {
if Some(did) == tcx.lang_items().owned_box() {
flags |= AdtFlags::IS_BOX;
}
if Some(did) == tcx.lang_items().manually_drop() {
flags |= AdtFlags::IS_MANUALLY_DROP;
}
if Some(did) == tcx.lang_items().arc() {
flags |= AdtFlags::IS_ARC;
}
@ -2280,6 +2286,12 @@ impl<'tcx> AdtDef {
self.flags.contains(AdtFlags::IS_BOX)
}
/// Returns `true` if this is ManuallyDrop<T>.
#[inline]
pub fn is_manually_drop(&self) -> bool {
self.flags.contains(AdtFlags::IS_MANUALLY_DROP)
}
/// Returns `true` if this type has a destructor.
pub fn has_dtor(&self, tcx: TyCtxt<'tcx>) -> bool {
self.destructor(tcx).is_some()