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LibJS: Implement Atomics.exchange
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4 changed files with 95 additions and 0 deletions
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test("invariants", () => {
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expect(Atomics.exchange).toHaveLength(3);
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});
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test("error cases", () => {
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expect(() => {
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Atomics.exchange("not an array", 0, 0);
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}).toThrow(TypeError);
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expect(() => {
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const bad_array_type = new Float32Array(4);
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Atomics.exchange(bad_array_type, 0, 0);
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}).toThrow(TypeError);
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expect(() => {
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const bad_array_type = new Uint8ClampedArray(4);
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Atomics.exchange(bad_array_type, 0, 0);
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}).toThrow(TypeError);
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expect(() => {
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const array = new Int32Array(4);
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Atomics.exchange(array, 100, 0);
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}).toThrow(RangeError);
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});
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test("basic functionality (non-BigInt)", () => {
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[Int8Array, Int16Array, Int32Array, Uint8Array, Uint16Array, Uint32Array].forEach(ArrayType => {
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const array = new ArrayType(4);
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array[0] = 1;
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array[1] = 2;
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array[2] = 3;
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array[3] = 4;
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expect(Atomics.exchange(array, 0, 5)).toBe(1);
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expect(array).toEqual([5, 2, 3, 4]);
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expect(Atomics.exchange(array, 0, 6)).toBe(5);
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expect(array).toEqual([6, 2, 3, 4]);
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expect(Atomics.exchange(array, "1", 7)).toBe(2);
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expect(array).toEqual([6, 7, 3, 4]);
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expect(Atomics.exchange(array, 2, "8")).toBe(3);
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expect(array).toEqual([6, 7, 8, 4]);
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expect(Atomics.exchange(array, 3.14, 9)).toBe(4);
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expect(array).toEqual([6, 7, 8, 9]);
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});
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});
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test("basic functionality (BigInt)", () => {
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[BigInt64Array, BigUint64Array].forEach(ArrayType => {
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const array = new ArrayType(4);
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array[0] = 1n;
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array[1] = 2n;
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array[2] = 3n;
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array[3] = 4n;
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expect(Atomics.exchange(array, 0, 5n)).toBe(1n);
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expect(array).toEqual([5n, 2n, 3n, 4n]);
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expect(Atomics.exchange(array, 0, 6n)).toBe(5n);
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expect(array).toEqual([6n, 2n, 3n, 4n]);
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expect(Atomics.exchange(array, 1, 7n)).toBe(2n);
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expect(array).toEqual([6n, 7n, 3n, 4n]);
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expect(Atomics.exchange(array, 2, 8n)).toBe(3n);
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expect(array).toEqual([6n, 7n, 8n, 4n]);
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expect(Atomics.exchange(array, 3, 9n)).toBe(4n);
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expect(array).toEqual([6n, 7n, 8n, 9n]);
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});
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});
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