private static Expression /*!*/ PeekReferenceUnchecked(PhpRoutine routine, DynamicMetaObject scriptContext, DynamicMetaObject arg, int argIndex)
{
// the caller may not pushed a reference although the formal argument is a reference:
// it doesn't matter if called by callback:
if (!Types.PhpReference[0].IsAssignableFrom(arg.LimitType))
{
// caller may have pushed a runtime chain => evaluate it:
if (arg.LimitType == Types.PhpRuntimeChain[0])
{
//result = php_chain.GetReference(Context);
return(Expression.Call(
Expression.Convert(arg.Expression, Types.PhpRuntimeChain[0]),
Methods.PhpRuntimeChain.GetReference,
scriptContext.Expression));
}
else
{
// the reason of copy is not exactly known (it may be returning by copy as well as passing by copy):
// result = new PhpReference(PhpVariable.Copy(arg_i, CopyReason.Unknown));
ParameterExpression resultVariable = Expression.Parameter(Types.PhpReference[0], "result");
ParameterExpression[] vars = new ParameterExpression[] { resultVariable };
return(Expression.Block(vars,
Expression.Assign(
resultVariable,
Expression.New(Constructors.PhpReference_Object, Expression.Call(Methods.PhpVariable.Copy, arg.Expression, Expression.Constant(CopyReason.Unknown)))),
BinderHelper.ThrowArgumentNotPassedByRef(argIndex, routine.FullName),
resultVariable));
//(MB) I'm not sure if it's necessary to execute these two in this order
//Original code
//
//(MB) I don't have to solve this now, PhpCallback is called in a old manner. So I can just throw exception always now.
//
// Reports an error in the case that we are not called by callback.
// Although, this error is fatal one can switch throwing exceptions off.
// If this is the case the afterwards behavior will be the same as if callback was called.
//if (!Callback)
//{
// // warning (can invoke user code => we have to save and restore callstate):
// CallState call_state = SaveCallState();
// PhpException.ArgumentNotPassedByRef(i, CalleeName);
// RestoreCallState(call_state);
//}
}
}
else
{
return(Expression.Convert(arg.Expression, arg.LimitType));
}
}
