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LibJS: Implement missing conditional when creating a TypedArray subarray

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Timothy Flynn 2023-12-27 14:18:06 -05:00 • committed by Tim Flynn
parent 522302d5d6
commit f1e01a681e
2 changed files with 19 additions and 1 deletions
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2
Userland/Libraries/LibJS/Runtime/TypedArrayPrototype.cpp
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@ -1846,7 +1846,7 @@ JS_DEFINE_NATIVE_FUNCTION(TypedArrayPrototype::subarray)
MarkedVector<Value> arguments(vm.heap()); MarkedVector<Value> arguments(vm.heap());
// 15. If O.[[ArrayLength]] is auto and end is undefined, then // 15. If O.[[ArrayLength]] is auto and end is undefined, then
if (typed_array->array_length().is_auto()) { if (typed_array->array_length().is_auto() && end.is_undefined()) {
// a. Let argumentsList be « buffer, 𝔽(beginByteOffset) ». // a. Let argumentsList be « buffer, 𝔽(beginByteOffset) ».
arguments.empend(buffer); arguments.empend(buffer);
arguments.empend(begin_byte_offset.value()); arguments.empend(begin_byte_offset.value());

18
Userland/Libraries/LibJS/Tests/builtins/TypedArray/TypedArray.prototype.subarray.js
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@ -57,3 +57,21 @@ test("resizable ArrayBuffer", () => {
expect(typedArray.subarray(0, 1).byteLength).toBe(0); expect(typedArray.subarray(0, 1).byteLength).toBe(0);
}); });
}); });
test("resizable ArrayBuffer resized during `start` parameter access", () => {
TYPED_ARRAYS.forEach(T => {
let arrayBuffer = new ArrayBuffer(T.BYTES_PER_ELEMENT * 2, {
maxByteLength: T.BYTES_PER_ELEMENT * 4,
});
let badAccessor = {
valueOf: () => {
arrayBuffer.resize(T.BYTES_PER_ELEMENT * 4);
return 0;
},
};
let typedArray = new T(arrayBuffer);
expect(typedArray.subarray(badAccessor, typedArray.length).length).toBe(2);
});
});