private Scriptable alloc(Context cx, Object[] args) {
ScriptableObject obj = objArg(args, 0, ScriptableObject.class, true);
int size = intArg(args, 1);
Object typeObj = objArg(args, 2, Object.class, false);
int type;
if ((typeObj == null) || Undefined.instance.equals(typeObj)) {
type = 2;
} else {
type = ScriptRuntime.toInt32(typeObj);
}
if (obj.getExternalArrayData() != null) {
throw Utils.makeTypeError(cx, this, "object already has external array data");
}
ExternalArrayData array;
// Switch needs to match constants in smalloc.js
switch (type) {
case 1:
array = new NativeInt8Array(size);
break;
case 2:
array = new NativeUint8Array(size);
break;
case 3:
array = new NativeInt16Array(size);
break;
case 4:
array = new NativeUint16Array(size);
break;
case 5:
array = new NativeInt32Array(size);
break;
case 6:
array = new NativeUint32Array(size);
break;
case 7:
array = new NativeFloat32Array(size);
break;
case 8:
array = new NativeFloat64Array(size);
break;
case 9:
array = new NativeUint8ClampedArray(size);
break;
default:
throw Utils.makeError(cx, this, "Invalid array type");
}
obj.setExternalArrayData(array);
return obj;
}
