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Merge StaticMut and Static logic

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This commit is contained in:
Oliver Scherer 2019-06-11 16:17:08 +02:00
parent d6fa4070be
commit 9e3fbcfd57
1 changed files with 6 additions and 6 deletions
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12
src/librustc_mir/interpret/intern.rs
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@ -44,9 +44,9 @@ struct InternVisitor<'rt, 'a: 'rt, 'mir: 'rt, 'tcx: 'a+'rt+'mir> {
#[derive(Copy, Clone, Debug, PartialEq, Hash, Eq)]
enum InternMode {
/// Mutable references don't change the `mutability` field to `Immutable`
StaticMut,
/// Mutable references must in fact be immutable due to their surrounding immutability
/// Mutable references must in fact be immutable due to their surrounding immutability in a
/// `static`. In a `static mut` we start out as mutable and thus can also contain further `&mtu`
/// that will actually be treated as mutable.
Static,
/// UnsafeCell is OK in the value of a constant, but not behind references in a constant
ConstBase,
@ -171,10 +171,10 @@ for
// This is not an inherent limitation, but one that we know to be true, because
// const qualification enforces it. We can lift it in the future.
match (self.mode, mutability) {
// all is "good and well" in the unsoundness of `static mut`
(InternMode::StaticMut, _) => {},
// immutable references are fine everywhere
(_, hir::Mutability::MutImmutable) => {},
// all is "good and well" in the unsoundness of `static mut`
// mutable references are ok in `static`. Either they are treated as immutable
// because they are behind an immutable one, or they are behind an `UnsafeCell`
// and thus ok.
@ -251,7 +251,7 @@ pub fn intern_const_alloc_recursive(
Some(hir::Mutability::MutImmutable) => (Mutability::Immutable, InternMode::Static),
None => (Mutability::Immutable, InternMode::ConstBase),
// `static mut` doesn't care about interior mutability, it's mutable anyway
Some(hir::Mutability::MutMutable) => (Mutability::Mutable, InternMode::StaticMut),
Some(hir::Mutability::MutMutable) => (Mutability::Mutable, InternMode::Static),
};
// type based interning