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Test CopyTaggedPtr's HashStable impl

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This commit is contained in:
Maybe Waffle 2023-04-14 11:59:53 +00:00
parent 251f662e4d
commit 36f5918bf1
2 changed files with 26 additions and 0 deletions
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7
compiler/rustc_data_structures/src/tagged_ptr.rs
View File

@ -261,3 +261,10 @@ unsafe impl Tag for Tag2 {
}
}
}
#[cfg(test)]
impl<HCX> crate::stable_hasher::HashStable<HCX> for Tag2 {
fn hash_stable(&self, hcx: &mut HCX, hasher: &mut crate::stable_hasher::StableHasher) {
(*self as u8).hash_stable(hcx, hasher);
}
}

19
compiler/rustc_data_structures/src/tagged_ptr/copy/tests.rs
View File

@ -1,5 +1,6 @@
use std::ptr;
use crate::stable_hasher::{HashStable, StableHasher};
use crate::tagged_ptr::{CopyTaggedPtr, Pointer, Tag, Tag2};
#[test]
@ -25,6 +26,24 @@ fn smoke() {
assert!(ptr::eq(copy.pointer(), reference));
}
#[test]
fn stable_hash_hashes_as_tuple() {
let hash_packed = {
let mut hasher = StableHasher::new();
tag_ptr(&12, Tag2::B11).hash_stable(&mut (), &mut hasher);
hasher.finalize()
};
let hash_tupled = {
let mut hasher = StableHasher::new();
(&12, Tag2::B11).hash_stable(&mut (), &mut hasher);
hasher.finalize()
};
assert_eq!(hash_packed, hash_tupled);
}
/// Helper to create tagged pointers without specifying `COMPARE_PACKED` if it does not matter.
fn tag_ptr<P: Pointer, T: Tag>(ptr: P, tag: T) -> CopyTaggedPtr<P, T, true> {
CopyTaggedPtr::new(ptr, tag)