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function assert_ArrayBuffer(actual, { size=0, shared=false, detached=false }, message) {
// https://github.com/WebAssembly/spec/issues/840
// See https://github.com/whatwg/html/issues/5380 for why not `self.SharedArrayBuffer`
const isShared = !("isView" in actual.constructor);
assert_equals(isShared, shared, `${message}: constructor`);
const sharedString = shared ? "Shared" : "";
assert_equals(actual.toString(), `[object ${sharedString}ArrayBuffer]`, `${message}: toString()`);
assert_equals(Object.getPrototypeOf(actual).toString(), `[object ${sharedString}ArrayBuffer]`, `${message}: prototype toString()`);
if (detached) {
// https://github.com/tc39/ecma262/issues/678
let byteLength;
try {
byteLength = actual.byteLength;
} catch (e) {
byteLength = 0;
}
assert_equals(byteLength, 0, `${message}: detached size`);
} else {
assert_equals(actual.byteLength, 0x10000 * size, `${message}: size`);
if (size > 0) {
const array = new Uint8Array(actual);
assert_equals(array[0], 0, `${message}: first element`);
assert_equals(array[array.byteLength - 1], 0, `${message}: last element`);
}
}
assert_equals(Object.isFrozen(actual), shared, "buffer frozen");
assert_equals(Object.isExtensible(actual), !shared, "buffer extensibility");
}
function assert_Memory(memory, { size=0, shared=false }) {
assert_equals(Object.getPrototypeOf(memory), WebAssembly.Memory.prototype,
"prototype");
assert_true(Object.isExtensible(memory), "extensible");
// https://github.com/WebAssembly/spec/issues/840
assert_equals(memory.buffer, memory.buffer, "buffer should be idempotent");
assert_ArrayBuffer(memory.buffer, { size, shared });
}
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