1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-07-27 08:17:35 +00:00

LibJS: Implement Atomics.compareExchange

This commit is contained in:
Timothy Flynn 2021-07-12 08:59:34 -04:00 committed by Linus Groh
parent 655ffce64d
commit 33eb830929
4 changed files with 144 additions and 0 deletions

View file

@ -0,0 +1,64 @@
test("invariants", () => {
expect(Atomics.compareExchange).toHaveLength(4);
});
test("error cases", () => {
expect(() => {
Atomics.compareExchange("not an array", 0, 0, 0);
}).toThrow(TypeError);
expect(() => {
const bad_array_type = new Float32Array(4);
Atomics.compareExchange(bad_array_type, 0, 0, 0);
}).toThrow(TypeError);
expect(() => {
const bad_array_type = new Uint8ClampedArray(4);
Atomics.compareExchange(bad_array_type, 0, 0, 0);
}).toThrow(TypeError);
expect(() => {
const array = new Int32Array(4);
Atomics.compareExchange(array, 100, 0, 0);
}).toThrow(RangeError);
});
test("basic functionality (non-BigInt)", () => {
[Int8Array, Int16Array, Int32Array, Uint8Array, Uint16Array, Uint32Array].forEach(ArrayType => {
const array = new ArrayType(2);
array[0] = 1;
array[1] = 2;
expect(Atomics.compareExchange(array, 0, 0, 5)).toBe(1);
expect(array).toEqual([1, 2]);
expect(Atomics.compareExchange(array, 0, 1, "5")).toBe(1);
expect(array).toEqual([5, 2]);
expect(Atomics.compareExchange(array, 0, "5", 6)).toBe(5);
expect(array).toEqual([6, 2]);
expect(Atomics.compareExchange(array, 1, 2, 3.14)).toBe(2);
expect(array).toEqual([6, 3]);
});
});
test("basic functionality (BigInt)", () => {
[BigInt64Array, BigUint64Array].forEach(ArrayType => {
const array = new ArrayType(2);
array[0] = 1n;
array[1] = 2n;
expect(Atomics.compareExchange(array, 0, 0n, 5n)).toBe(1n);
expect(array).toEqual([1n, 2n]);
expect(Atomics.compareExchange(array, 0, 1n, 5n)).toBe(1n);
expect(array).toEqual([5n, 2n]);
expect(Atomics.compareExchange(array, 0, 5n, 6n)).toBe(5n);
expect(array).toEqual([6n, 2n]);
expect(Atomics.compareExchange(array, 1, 2n, 3n)).toBe(2n);
expect(array).toEqual([6n, 3n]);
});
});