internal ScriptFunctionInstance(
Engine engine,
JintFunctionDefinition function,
LexicalEnvironment scope,
FunctionThisMode thisMode)
: base(engine, function, scope, thisMode)
{
_function = function;
_prototype = _engine.Function.PrototypeObject;
_length = new LazyPropertyDescriptor(() => JsNumber.Create(function.Initialize(engine, this).Length), PropertyFlag.Configurable);
var proto = new ObjectInstanceWithConstructor(engine, this)
{
_prototype = _engine.Object.PrototypeObject
};
_prototypeDescriptor = new PropertyDescriptor(proto, PropertyFlag.OnlyWritable);
if (!function.Strict && !engine._isStrict)
{
DefineOwnProperty(CommonProperties.Arguments, engine._callerCalleeArgumentsThrowerConfigurable);
DefineOwnProperty(CommonProperties.Caller, new PropertyDescriptor(Undefined, PropertyFlag.Configurable));
}
}
/// <summary>
/// http://www.ecma-international.org/ecma-262/5.1/#sec-13.2
/// </summary>
/// <param name="engine"></param>
/// <param name="functionDeclaration"></param>
/// <param name="scope"></param>
/// <param name="strict"></param>
public ScriptFunctionInstance(
Engine engine,
IFunction functionDeclaration,
LexicalEnvironment scope,
bool strict)
: base(engine, functionDeclaration.Id?.Name ?? "", GetParameterNames(functionDeclaration), scope, strict)
{
_functionDeclaration = functionDeclaration;
Extensible = true;
Prototype = _engine.Function.PrototypeObject;
_length = new PropertyDescriptor(JsNumber.Create(_formalParameters.Length), PropertyFlag.AllForbidden);
var proto = new ObjectInstanceWithConstructor(engine, this)
{
Extensible = true,
Prototype = _engine.Object.PrototypeObject
};
_prototype = new PropertyDescriptor(proto, PropertyFlag.OnlyWritable);
if (_functionDeclaration.Id != null)
{
DefineOwnProperty("name", new PropertyDescriptor(_functionDeclaration.Id.Name, PropertyFlag.None), false);
}
if (strict)
{
var thrower = engine.Function.ThrowTypeError;
const PropertyFlag flags = PropertyFlag.EnumerableSet | PropertyFlag.ConfigurableSet;
DefineOwnProperty("caller", new GetSetPropertyDescriptor(thrower, thrower, flags), false);
DefineOwnProperty("arguments", new GetSetPropertyDescriptor(thrower, thrower, flags), false);
}
}