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BigInt64Array / BigUint64Array indexOf, lastIndexOf, includes: an out-of-range BigInt needle matches nothing (WebKit bump for oven-sh/WebKit#607) - #42089
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…-of-range BigInt needle matches nothing (WebKit bump for oven-sh/WebKit#607) JSC converted the needle with ToBigInt64 / ToBigUint64, which wrap modulo 2^64, so new BigInt64Array([-1n]).includes(2n ** 64n - 1n) was true. Pin WebKit to the preview build of oven-sh/WebKit#607, which makes the conversion return no match for a BigInt the element type cannot represent, and add coverage.
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Status Reproduced on bun 1.4.3 and canary with the snippet from the report: const i64 = new BigInt64Array([3n, -1n]);
const u64 = new BigUint64Array([2n ** 63n - 1n, 0n]);
console.log(
i64.indexOf(2n ** 64n - 1n), i64.includes(18446744073709551615n), i64.indexOf(2n ** 64n + 3n),
u64.indexOf(-(2n ** 63n) - 1n), u64.lastIndexOf(2n ** 64n), u64.includes(-(2n ** 64n)),
Array.prototype.indexOf.call(i64, 2n ** 64n - 1n),
);
// bun 1.4.3: 1 true 0 0 1 true -1
// node 26 / this PR: -1 false -1 -1 -1 false -1
The JSC change is oven-sh/WebKit#607. This PR pins its preview build and must not merge before that PR lands. I move the pin to the merged commit then. |
WalkthroughChangesWebKit and BigInt typed-array search
Suggested reviewers: Priority: ⬇️ Low Merge Risk: 🔵 Low · up to This updates WebKit behavior for BigInt typed-array searches, but the dependency pin should follow the repository convention and the regression suite should cover duplicate matches for lastIndexOf before relying on it for that behavior. 🚥 Pre-merge checks | ✅ 4✅ Passed checks (4 passed)
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Inline comments:
In `@scripts/build/deps/webkit.ts`:
- Line 6: Update the webkit dependency pin using the required commit field in
the webkit dependency configuration instead of changing WEBKIT_VERSION,
preserving the intended dependency revision.
In `@test/js/bun/jsc/bigint-typed-array-index-of.test.ts`:
- Line 102: Add a duplicate-element test case in the BigInt typed-array index
tests, using a value such as [3n, 7n, 7n] with needle 7n, and set separate
expected results for indexOf and lastIndexOf so they validate the first and
final matching positions.
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scripts/build/deps/webkit.tstest/js/bun/jsc/bigint-typed-array-index-of.test.ts
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Addressed the review in 976d77c: the test now has a repeated-element row, so |
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…ows from #42083 and #42089 Adds the rows those two PRs pinned that this file did not have yet: negative int32 needles and arithmetic results on Float32Array, the 65505..65519 and 65535 needles on Float16Array, more wrapped BigInt needles (negative many-digit, -(2^64) +/- 1, -(2^63) - 1 on BigUint64Array), and the same searches through a subarray, a resizable buffer, a shared buffer, and with a fromIndex.
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Superseded by #42093, which pins the oven-sh/WebKit#609 preview. That change includes this fix (the |
2 participants
Problem
BigInt64Array/BigUint64Array.indexOf,.lastIndexOfand.includesreport a match for a BigInt needle that wraps to an element modulo 2^64:new BigInt64Array([3n, -1n]).indexOf(2n ** 64n - 1n)is1andnew BigUint64Array([0n]).includes(-(2n ** 64n))istrue. Node and Chromium return-1/false.toNativeFromValueWithoutCoercion()(Source/JavaScriptCore/runtime/ToNativeFromValue.h) converted the needle withJSBigInt::toBigInt64/toBigUInt64, which are ToBigInt64 / ToBigUint64: the value modulo 2^64. The search then compared the wrapped bits with the raw elements.Fix
autobuild-preview-pr-607-bb622e7b, the preview build of [JSC] BigInt64Array / BigUint64Array indexOf, lastIndexOf and includes: an out-of-range BigInt needle matches nothing WebKit#607. That change addsJSBigInt::tryGetAsInt64/tryGetAsUint64, which return no value instead of wrapping, and converts the needle with them. A needle the element type cannot represent now matches nothing, like a needle that is not a BigInt.mainpast the current pin.test/js/bun/jsc/bigint-typed-array-index-of.test.ts(new) fails 22 of 40 on bun 1.4.3 (every out-of-range row) and passes withbun bd testagainst this prebuilt.Background
indexOf/lastIndexOf, SameValueZero forincludes). A needle outside [-2^63, 2^63 - 1], or [0, 2^64 - 1] forBigUint64Array, equals no element.Array.prototype.indexOf.call(typedArray, needle)takes the generic property path and was always correct. The test uses it as a reference.[policy-decision:webkit] gate passed · iteration 0 · 2 files touched
passes on PR (with fix)
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gate history · 2 passed · 0 rejected · iteration 0
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