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// Tests for detached ArrayBuffer checks in %TypedArray%.prototype.slice ( start, end ).
function* createTypedArrays(lengths = [0, 1, 4, 4096]) {
// Test with eagerly created ArrayBuffer.
for (let length of lengths) {
let buffer = new ArrayBuffer(length * Int32Array.BYTES_PER_ELEMENT);
let typedArray = new Int32Array(buffer);
yield {typedArray, length, buffer() { return buffer; }};
}
// Test with lazily created ArrayBuffer.
for (let length of lengths) {
let typedArray = new Int32Array(length);
yield {typedArray, length, buffer() { return typedArray.buffer; }};
}
}
if (typeof detachArrayBuffer === "function") {
// ArrayBuffer is detached when entering slice().
for (let {typedArray, buffer} of createTypedArrays()) {
detachArrayBuffer(buffer());
assertThrowsInstanceOf(() => {
typedArray.slice(0);
}, TypeError, "ArrayBuffer is detached on function entry");
}
// ArrayBuffer is detached when computing ToInteger(start).
for (let {typedArray, length, buffer} of createTypedArrays()) {
let detached = false;
let start = {
valueOf() {
assertEq(detached, false);
detachArrayBuffer(buffer());
assertEq(detached, false);
detached = true;
return 0;
}
};
// Doesn't throw an error when no bytes are copied.
if (length === 0) {
typedArray.slice(start);
} else {
assertThrowsInstanceOf(() => {
typedArray.slice(start);
}, TypeError, "ArrayBuffer is detached in ToInteger(start)");
}
assertEq(detached, true, "detachArrayBuffer was called");
}
// ArrayBuffer is detached when computing ToInteger(end).
for (let {typedArray, length, buffer} of createTypedArrays()) {
let detached = false;
let end = {
valueOf() {
assertEq(detached, false);
detachArrayBuffer(buffer());
assertEq(detached, false);
detached = true;
return length;
}
};
// Doesn't throw an error when no bytes are copied.
if (length === 0) {
typedArray.slice(0, end);
} else {
assertThrowsInstanceOf(() => {
typedArray.slice(0, end);
}, TypeError, "ArrayBuffer is detached in ToInteger(end)");
}
assertEq(detached, true, "detachArrayBuffer was called");
}
// ArrayBuffer is detached in species constructor.
for (let {typedArray, length, buffer} of createTypedArrays()) {
let detached = false;
typedArray.constructor = {
[Symbol.species]: function(...args) {
assertEq(detached, false);
detachArrayBuffer(buffer());
assertEq(detached, false);
detached = true;
return new Int32Array(...args);
}
};
// Doesn't throw an error when no bytes are copied.
if (length === 0) {
typedArray.slice(0);
} else {
assertThrowsInstanceOf(() => {
typedArray.slice(0);
}, TypeError, "ArrayBuffer is detached in TypedArraySpeciesCreate(...)");
}
assertEq(detached, true, "detachArrayBuffer was called");
}
}
if (typeof reportCompare === "function")
reportCompare(true, true);