|
public GetReturnLabel ( ) : |
||
| return | ||
Expr ILastStatementVisitor <Expr> .Visit(LastStatement.Return lastStatement)
{
var returnLabel = scope.GetReturnLabel();
if (returnLabel == null)
{
return(Expr.Empty());
}
var returnValues = lastStatement.Values
.Select(expr => Expr.Convert(expr.Visit(this), typeof(object))).ToArray();
if (returnValues.Length == 0)
{
return(Expr.Return(returnLabel));
}
if (returnValues.Length == 1)
{
return(Expr.Return(returnLabel, returnValues[0]));
}
return(Expr.Return(
returnLabel,
Expr.New(MemberInfos.NewVarargs, Expr.NewArrayInit(typeof(object), returnValues))));
}
public Expression <Func <dynamic> > Compile(Block block)
{
scope = Scope.CreateRoot();
var blockExpr = Visit(block);
var expr = Expr.Block(blockExpr, Expr.Label(scope.GetReturnLabel(), Expr.Constant(null)));
return(Expr.Lambda <Func <dynamic> >(expr));
}
public LabelTarget GetReturnLabel()
{
if (returnLabel != null)
{
return(returnLabel);
}
if (parent == null)
{
return(null);
}
return(parent.GetReturnLabel());
}
Expr Visit(string name, FunctionBody function)
{
var parentScope = scope;
scope = Scope.CreateFunctionChild(scope);
var parameters = function.Parameters.Select(p => scope.AddLocal(p)).ToList();
if (function.Varargs)
{
parameters.Add(scope.AddLocal(Constant.VARARGS, typeof(Varargs)));
}
var bodyExpr = Expr.Block(Visit(function.Body), Expr.Label(scope.GetReturnLabel(), Expr.Constant(null)));
var lambdaExpr = Expr.Lambda(bodyExpr, Constant.FUNCTION_PREFIX + name, parameters);
scope = parentScope;
return(lambdaExpr);
}
