src/third_party/mozjs-45/js/src/tests/js1_8_5/extensions/clone-typed-array.js

// |reftest| skip-if(!xulRuntime.shell)
// Any copyright is dedicated to the Public Domain.
// http://creativecommons.org/licenses/publicdomain/

function assertArraysEqual(a, b) {
    assertEq(a.constructor, b.constructor);
    assertEq(a.length, b.length);
    for (var i = 0; i < a.length; i++)
        assertEq(a[i], b[i]);
}

function check(b) {
    var a = deserialize(serialize(b));
    assertArraysEqual(a, b);
}

function checkPrototype(ctor) {
    var threw = false;
    try {
	serialize(ctor.prototype);
	throw new Error("serializing " + ctor.name + ".prototype should throw a TypeError");
    } catch (exc) {
	if (!(exc instanceof TypeError))
	    throw exc;
    }
}

function test() {
    // Test cloning ArrayBuffer objects.
    check(new ArrayBuffer(0));
    check(new ArrayBuffer(7));
    checkPrototype(ArrayBuffer);

    // Test cloning typed array objects.
    var ctors = [
        Int8Array,
        Uint8Array,
        Int16Array,
        Uint16Array,
        Int32Array,
        Uint32Array,
        Float32Array,
        Float64Array,
        Uint8ClampedArray];

    var b;
    for (var i = 0; i < ctors.length; i++) {
        var ctor = ctors[i];

        // check empty array
        b = new ctor(0);
        check(b);

        // check array with some elements
        b = new ctor(100);
        var v = 1;
        for (var j = 0; j < 100; j++) {
            b[j] = v;
            v *= 7;
        }
        b[99] = NaN; // check serializing NaNs too
        check(b);

	// try the prototype
	checkPrototype(ctor);
    }

    // Two TypedArrays backed by the same ArrayBuffer should be cloned into two
    // TypedArrays still sharing a buffer. This also tests cloning TypedArrays
    // where the arr->data pointer is not 8-byte-aligned.

    var base = new Int8Array([0, 1, 2, 3]);
    b = [new Int8Array(base.buffer, 0, 3), new Int8Array(base.buffer, 1, 3)];
    var a = deserialize(serialize(b));
    base[1] = -1;
    a[0][2] = -2;
    assertArraysEqual(b[0], new Int8Array([0, -1, 2])); // shared with base
    assertArraysEqual(b[1], new Int8Array([-1, 2, 3])); // shared with base
    assertArraysEqual(a[0], new Int8Array([0, 1, -2])); // not shared with base
    assertArraysEqual(a[1], new Int8Array([1, -2, 3])); // not shared with base, shared with a[0]

    assertEq(b[0].buffer, b[1].buffer);
    assertEq(b[1].byteOffset, 1);
    assertEq(b[1].byteLength, 3);
    assertEq(b[1].buffer.byteLength, 4);

    // ArrayBuffer clones do not preserve properties

    base = new Int8Array([0, 1, 2, 3]);
    b = [new Int8Array(base.buffer, 0, 3), new Int8Array(base.buffer, 1, 3)];
    base.buffer.prop = "yes";
    base.buffer.loop = b[0];
    base.buffer.loops = [ b[0], b[1] ];
    a = deserialize(serialize(b));
    assertEq("prop" in a[0].buffer, false);
    assertEq("prop" in a[1].buffer, false);
    assertEq("loop" in a[0].buffer, false);
    assertEq("loop" in a[1].buffer, false);
    assertEq("loops" in a[0].buffer, false);
    assertEq("loops" in a[1].buffer, false);
}

test();
reportCompare(0, 0, 'ok');