| const createBuffer = (() => { |
| // See https://github.com/whatwg/html/issues/5380 for why not `new SharedArrayBuffer()` |
| let sabConstructor; |
| try { |
| sabConstructor = new WebAssembly.Memory({ shared:true, initial:0, maximum:0 }).buffer.constructor; |
| } catch(e) { |
| sabConstructor = null; |
| } |
| return (type, length) => { |
| if (type === "ArrayBuffer") { |
| return new ArrayBuffer(length); |
| } else if (type === "SharedArrayBuffer") { |
| if (sabConstructor && sabConstructor.name !== "SharedArrayBuffer") { |
| throw new Error("WebAssembly.Memory does not support shared:true"); |
| } |
| return new sabConstructor(length); |
| } else { |
| throw new Error("type has to be ArrayBuffer or SharedArrayBuffer"); |
| } |
| } |
| })(); |
