Fix visibility of some Kani intrinsics (rust-lang#3323)

This PR fixes inadvertently exposing some of the unstable Kani
intrinsics.

By submitting this pull request, I confirm that my contribution is made
under the terms of the Apache 2.0 and MIT licenses.

library/kani/src/mem.rs

@@ -300,7 +300,7 @@ unsafe fn has_valid_value<T: ?Sized>(_ptr: *const T) -> bool {
 /// Check whether `len * size_of::<T>()` bytes are initialized starting from `ptr`.
 #[rustc_diagnostic_item = "KaniIsInitialized"]
 #[inline(never)]
-pub fn is_initialized<T: ?Sized>(_ptr: *const T) -> bool {
+pub(crate) fn is_initialized<T: ?Sized>(_ptr: *const T) -> bool {
  kani_intrinsic()
 }
 
@@ -311,13 +311,25 @@ fn assert_is_initialized<T: ?Sized>(ptr: *const T) -> bool {
 }
 
 /// Get the object ID of the given pointer.
+#[doc(hidden)]
+#[crate::unstable(
+ feature = "ghost-state",
+ issue = 3184,
+ reason = "experimental ghost state/shadow memory API"
+)]
 #[rustc_diagnostic_item = "KaniPointerObject"]
 #[inline(never)]
 pub fn pointer_object<T: ?Sized>(_ptr: *const T) -> usize {
  kani_intrinsic()
 }
 
 /// Get the object offset of the given pointer.
+#[doc(hidden)]
+#[crate::unstable(
+ feature = "ghost-state",
+ issue = 3184,
+ reason = "experimental ghost state/shadow memory API"
+)]
 #[rustc_diagnostic_item = "KaniPointerOffset"]
 #[inline(never)]
 pub fn pointer_offset<T: ?Sized>(_ptr: *const T) -> usize {

library/kani_core/src/mem.rs

@@ -306,7 +306,7 @@ macro_rules! kani_mem {
  /// Check whether `len * size_of::<T>()` bytes are initialized starting from `ptr`.
  #[rustc_diagnostic_item = "KaniIsInitialized"]
  #[inline(never)]
- pub fn is_initialized<T: ?Sized>(_ptr: *const T) -> bool {
+ pub(crate) fn is_initialized<T: ?Sized>(_ptr: *const T) -> bool {
  kani_intrinsic()
  }
 
@@ -320,16 +320,30 @@ macro_rules! kani_mem {
  }
 
  /// Get the object ID of the given pointer.
+ // TODO: Add this back later, as there is no unstable attribute here.
+ // #[doc(hidden)]
+ // #[crate::unstable(
+ // feature = "ghost-state",
+ // issue = 3184,
+ // reason = "experimental ghost state/shadow memory API"
+ // )]
  #[rustc_diagnostic_item = "KaniPointerObject"]
  #[inline(never)]
- pub fn pointer_object<T: ?Sized>(_ptr: *const T) -> usize {
+ pub(crate) fn pointer_object<T: ?Sized>(_ptr: *const T) -> usize {
  kani_intrinsic()
  }
 
  /// Get the object offset of the given pointer.
+ // TODO: Add this back later, as there is no unstable attribute here.
+ // #[doc(hidden)]
+ // #[crate::unstable(
+ // feature = "ghost-state",
+ // issue = 3184,
+ // reason = "experimental ghost state/shadow memory API"
+ // )]
  #[rustc_diagnostic_item = "KaniPointerOffset"]
  #[inline(never)]
- pub fn pointer_offset<T: ?Sized>(_ptr: *const T) -> usize {
+ pub(crate) fn pointer_offset<T: ?Sized>(_ptr: *const T) -> usize {
  kani_intrinsic()
  }
  };