/// <summary>
/// Gets an expression which is used for accessing this slot. If the slot lookup fails the error expression
/// is used again.
///
/// The default implementation just calls the TryGetValue method. Subtypes of PythonTypeSlot can override
/// this and provide a more optimal implementation.
/// </summary>
internal virtual void MakeGetExpression(PythonBinder /*!*/ binder, Expression /*!*/ codeContext, DynamicMetaObject instance, DynamicMetaObject /*!*/ owner, ConditionalBuilder /*!*/ builder)
{
ParameterExpression tmp = Ast.Variable(typeof(object), "slotTmp");
Expression call = Ast.Call(
typeof(PythonOps).GetMethod("SlotTryGetValue"),
codeContext,
AstUtils.Convert(AstUtils.WeakConstant(this), typeof(PythonTypeSlot)),
instance != null ? instance.Expression : AstUtils.Constant(null),
owner.Expression,
tmp
);
builder.AddVariable(tmp);
if (!GetAlwaysSucceeds)
{
builder.AddCondition(
call,
tmp
);
}
else
{
builder.FinishCondition(Ast.Block(call, tmp));
}
}
