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[TypedArray.prototype.copyWithin] Cover overlapping source/destination ranges

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Ref https://github.com/tc39/ecma262/pull/3619
Ref https://github.com/tc39/ecma262/issues/3618
This commit is contained in:
Richard Gibson 2025-07-28 18:46:12 -04:00 committed by Ms2ger
parent e5731d6fa7
commit 4868f0f66c
1 changed files with 30 additions and 0 deletions
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30
test/built-ins/TypedArray/prototype/copyWithin/coerced-target-start-end-shrink.js vendored
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@ -65,3 +65,33 @@ for (let ctor of ctors) {
assert.compareArray(ToNumbers(lengthTracking), [2, 1, 2], assert.compareArray(ToNumbers(lengthTracking), [2, 1, 2],
ctor.name + " truncated copy backward."); ctor.name + " truncated copy backward.");
} }
for (let ctor of ctors) {
const rab = CreateResizableArrayBuffer(4 * ctor.BYTES_PER_ELEMENT, 8 * ctor.BYTES_PER_ELEMENT);
const lengthTracking = fillWithIndexes(new ctor(rab), 4);
// [0, 1, 2,] 3]
// <=--> dest
// <=-> src
const evil = () => {
rab.resize(3 * ctor.BYTES_PER_ELEMENT);
return 2;
};
lengthTracking.copyWithin({ valueOf: evil }, 1);
assert.compareArray(ToNumbers(lengthTracking), [0, 1, 1],
ctor.name + " truncated overlapping copy forward.");
}
for (let ctor of ctors) {
const rab = CreateResizableArrayBuffer(4 * ctor.BYTES_PER_ELEMENT, 8 * ctor.BYTES_PER_ELEMENT);
const lengthTracking = fillWithIndexes(new ctor(rab), 4);
// [0, 1, 2,] 3]
// <=--> src
// <=-> dest
const evil = () => {
rab.resize(3 * ctor.BYTES_PER_ELEMENT);
return 2;
};
lengthTracking.copyWithin(1, { valueOf: evil });
assert.compareArray(ToNumbers(lengthTracking), [0, 2, 2],
ctor.name + " truncated overlapping copy backward.");
}