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Fix MultiFieldsULE #3642

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merged 3 commits into from
Jul 5, 2023
Merged

Fix MultiFieldsULE #3642

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9f48a4f
add test that captures VZVFormat details
skius Jul 5, 2023
f76a4e6
fix MultiFieldsULE
skius Jul 5, 2023
400a956
fmt
skius Jul 5, 2023
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27 changes: 27 additions & 0 deletions utils/zerovec/derive/examples/make_var.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -59,6 +59,20 @@ struct MultiFieldStruct<'a> {
f: char,
}

#[make_varule(MultiFieldConsecutiveStructULE)]
#[derive(Clone, PartialEq, Eq, PartialOrd, Ord, Debug, serde::Serialize, serde::Deserialize)]
#[zerovec::derive(Serialize, Deserialize, Debug)]
struct MultiFieldConsecutiveStruct<'a> {
#[serde(borrow)]
a: Cow<'a, str>,
#[serde(borrow)]
b: Cow<'a, str>,
#[serde(borrow)]
c: Cow<'a, str>,
#[serde(borrow)]
d: Cow<'a, str>,
}

#[make_varule(CustomVarFieldULE)]
#[derive(Clone, PartialEq, Eq, PartialOrd, Ord, Debug, serde::Serialize, serde::Deserialize)]
#[zerovec::derive(Serialize, Deserialize, Debug)]
Expand Down Expand Up @@ -139,6 +153,11 @@ fn main() {
assert_eq!(stack, &MultiFieldStruct::zero_from(zero))
});

assert_zerovec::<MultiFieldConsecutiveStructULE, MultiFieldConsecutiveStruct, _>(
TEST_MULTICONSECUTIVE,
|stack, zero| assert_eq!(stack, &MultiFieldConsecutiveStruct::zero_from(zero)),
);

let vartuples = &[
VarTupleStruct(101, 'ø', TEST_STRINGS1.into()),
VarTupleStruct(9499, '⸘', TEST_STRINGS2.into()),
Expand Down Expand Up @@ -197,3 +216,11 @@ const TEST_MULTIFIELD: &[MultiFieldStruct<'static>] = &[
f: 'ə',
},
];

const TEST_MULTICONSECUTIVE: &[MultiFieldConsecutiveStruct<'static>] =
&[MultiFieldConsecutiveStruct {
a: Cow::Borrowed("one"),
b: Cow::Borrowed("2"),
c: Cow::Borrowed("three"),
d: Cow::Borrowed("four"),
}];
8 changes: 5 additions & 3 deletions utils/zerovec/src/ule/multi.rs
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Expand Up @@ -44,7 +44,7 @@ impl MultiFieldsULE {
lengths, output,
);
debug_assert!(
<VarZeroSlice<[u8]>>::validate_byte_slice(output).is_ok(),
<VarZeroSlice<[u8], Index32>>::validate_byte_slice(output).is_ok(),
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Good sleuthing!

However, I think we should prefer Index16. No reason to use the extra bytes.

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cc @Manishearth

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Yeah, this is intended to default to Index16. In the long run we can introduce a derive config flag for this.

Also it's a data breaking change to change the format here, though I don't think ICU4X uses this yet (it will once casemap stabilizes)

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@Manishearth Manishearth Jul 5, 2023 •
edited
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wait, no, nvm, it should default to 32 since we expect the lengths to be large: this may be at the root of something sufficiently nested

for users who want 16 we should add a default type parameter and a zerovec attribute

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That's the issue of this PR, it is Index32 but not consistently. Switching to Index16 would be a breaking change as I understand

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(VarZeroVec defaults to Index16, but MFULE overrides that to Index32)

"Encoded slice must be valid VarZeroSlice"
);
// Safe since write_serializable_bytes produces a valid VarZeroSlice buffer
Expand Down Expand Up @@ -141,12 +141,14 @@ unsafe impl VarULE for MultiFieldsULE {
/// This impl exists so that EncodeAsVarULE can work.
#[inline]
fn validate_byte_slice(slice: &[u8]) -> Result<(), ZeroVecError> {
<VarZeroSlice<[u8]>>::validate_byte_slice(slice)
<VarZeroSlice<[u8], Index32>>::validate_byte_slice(slice)
}

#[inline]
unsafe fn from_byte_slice_unchecked(bytes: &[u8]) -> &Self {
// &Self is transparent over &VZS<..>
mem::transmute(<VarZeroSlice<[u8]>>::from_byte_slice_unchecked(bytes))
mem::transmute(<VarZeroSlice<[u8], Index32>>::from_byte_slice_unchecked(
bytes,
))
}
}
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