//TODO enable sharing of these custom delegates
private Delegate CreateCustomDelegate(Type delegateType)
{
//PerfTrack.NoteEvent(PerfTrack.Categories.Compiler, "Synchronously compiling a custom delegate");
var method = delegateType.GetMethod("Invoke");
var paramInfos = method.GetParameters();
var parameters = new ParameterExpression[paramInfos.Length];
var parametersAsObject = new Expression[paramInfos.Length];
bool hasByRef = false;
for (int i = 0; i < paramInfos.Length; i++)
{
ParameterExpression parameter = Expression.Parameter(paramInfos[i].ParameterType, paramInfos[i].Name);
hasByRef = hasByRef || paramInfos[i].ParameterType.IsByRef;
parameters[i] = parameter;
parametersAsObject[i] = Expression.Convert(parameter, typeof(object));
}
var data = Expression.NewArrayInit(typeof(object), parametersAsObject);
var dlg = new Func <object[], object>(Run);
var dlgExpr = AstUtils.Constant(dlg);
var argsParam = Expression.Parameter(typeof(object[]), "$args");
Expression body;
if (method.ReturnType == typeof(void))
{
body = Expression.Block(typeof(void), Expression.Invoke(dlgExpr, argsParam));
}
else
{
body = Expression.Convert(Expression.Invoke(dlgExpr, argsParam), method.ReturnType);
}
if (hasByRef)
{
List <Expression> updates = new List <Expression>();
for (int i = 0; i < paramInfos.Length; i++)
{
if (paramInfos[i].ParameterType.IsByRef)
{
updates.Add(
Expression.Assign(
parameters[i],
Expression.Convert(
Expression.ArrayAccess(argsParam, Expression.Constant(i)),
paramInfos[i].ParameterType.GetElementType()
)
)
);
}
}
body = Expression.TryFinally(body, Expression.Block(typeof(void), updates));
}
body = Expression.Block(
method.ReturnType,
new[] { argsParam },
Expression.Assign(argsParam, data),
body
);
var lambda = Expression.Lambda(delegateType, body, parameters);
//return System.Linq.Expressions.Compiler.LambdaCompiler.Compile(lambda, null);
throw new NotImplementedException("byref delegate");
}
internal virtual Expression GetFalse()
{
// Using a singleton here to ensure a stable object identity for IfFalse, which Update relies on.
return(AstUtils.Empty());
}
