bjoernager/rust
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Add GenericArgKind::as_{type,const,region}

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This commit is contained in:
Maybe Waffle 2023-04-19 14:13:22 +00:00
parent d7f9e81650
commit 3f15521396
8 changed files with 88 additions and 98 deletions
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62
compiler/rustc_middle/src/ty/subst.rs
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@ -103,6 +103,30 @@ impl<'tcx> GenericArgKind<'tcx> {
GenericArg { ptr: unsafe { NonZeroUsize::new_unchecked(ptr | tag) }, marker: PhantomData }
}
#[inline]
pub fn as_type(self) -> Option<Ty<'tcx>> {
match self {
GenericArgKind::Type(ty) => Some(ty),
_ => None,
}
}
#[inline]
pub fn as_region(self) -> Option<ty::Region<'tcx>> {
match self {
GenericArgKind::Lifetime(re) => Some(re),
_ => None,
}
}
#[inline]
pub fn as_const(self) -> Option<ty::Const<'tcx>> {
match self {
GenericArgKind::Const(ct) => Some(ct),
_ => None,
}
}
}
impl<'tcx> fmt::Debug for GenericArg<'tcx> {
@ -379,22 +403,17 @@ impl<'tcx> InternalSubsts<'tcx> {
#[inline]
pub fn types(&'tcx self) -> impl DoubleEndedIterator<Item = Ty<'tcx>> + 'tcx {
self.iter()
.filter_map(|k| if let GenericArgKind::Type(ty) = k.unpack() { Some(ty) } else { None })
self.iter().filter_map(|k| k.unpack().as_type())
}
#[inline]
pub fn regions(&'tcx self) -> impl DoubleEndedIterator<Item = ty::Region<'tcx>> + 'tcx {
self.iter().filter_map(|k| {
if let GenericArgKind::Lifetime(lt) = k.unpack() { Some(lt) } else { None }
})
self.iter().filter_map(|k| k.unpack().as_region())
}
#[inline]
pub fn consts(&'tcx self) -> impl DoubleEndedIterator<Item = ty::Const<'tcx>> + 'tcx {
self.iter().filter_map(|k| {
if let GenericArgKind::Const(ct) = k.unpack() { Some(ct) } else { None }
})
self.iter().filter_map(|k| k.unpack().as_const())
}
#[inline]
@ -410,31 +429,28 @@ impl<'tcx> InternalSubsts<'tcx> {
#[inline]
#[track_caller]
pub fn type_at(&self, i: usize) -> Ty<'tcx> {
if let GenericArgKind::Type(ty) = self[i].unpack() {
ty
} else {
bug!("expected type for param #{} in {:?}", i, self);
}
self[i]
.unpack()
.as_type()
.unwrap_or_else(|| bug!("expected type for param #{} in {:?}", i, self))
}
#[inline]
#[track_caller]
pub fn region_at(&self, i: usize) -> ty::Region<'tcx> {
if let GenericArgKind::Lifetime(lt) = self[i].unpack() {
lt
} else {
bug!("expected region for param #{} in {:?}", i, self);
}
self[i]
.unpack()
.as_region()
.unwrap_or_else(|| bug!("expected region for param #{} in {:?}", i, self))
}
#[inline]
#[track_caller]
pub fn const_at(&self, i: usize) -> ty::Const<'tcx> {
if let GenericArgKind::Const(ct) = self[i].unpack() {
ct
} else {
bug!("expected const for param #{} in {:?}", i, self);
}
self[i]
.unpack()
.as_const()
.unwrap_or_else(|| bug!("expected const for param #{} in {:?}", i, self))
}
#[inline]