internal Func <object[], StrongBox <object>[], InterpretedFrame, int> CreateDelegate()
{
Expression body = this.Visit(this._loop);
ReadOnlyCollectionBuilder <Expression> expressions = new ReadOnlyCollectionBuilder <Expression>();
ReadOnlyCollectionBuilder <Expression> builder2 = new ReadOnlyCollectionBuilder <Expression>();
foreach (KeyValuePair <ParameterExpression, LoopVariable> pair in this._loopVariables)
{
LocalVariable variable;
if (!this._outerVariables.TryGetValue(pair.Key, out variable))
{
variable = this._closureVariables[pair.Key];
}
Expression right = variable.LoadFromArray(this._frameDataVar, this._frameClosureVar);
if (variable.InClosureOrBoxed)
{
ParameterExpression boxStorage = pair.Value.BoxStorage;
expressions.Add(Expression.Assign(boxStorage, right));
this.AddTemp(boxStorage);
}
else
{
expressions.Add(Expression.Assign(pair.Key, Utils.Convert(right, pair.Key.Type)));
if ((pair.Value.Access & ExpressionAccess.Write) != ExpressionAccess.None)
{
builder2.Add(Expression.Assign(right, Utils.Box(pair.Key)));
}
this.AddTemp(pair.Key);
}
}
if (builder2.Count > 0)
{
expressions.Add(Expression.TryFinally(body, Expression.Block(builder2)));
}
else
{
expressions.Add(body);
}
expressions.Add(Expression.Label(this._returnLabel, Expression.Constant(this._loopEndInstructionIndex - this._loopStartInstructionIndex)));
return(Expression.Lambda <Func <object[], StrongBox <object>[], InterpretedFrame, int> >((this._temps != null) ? Expression.Block((IEnumerable <ParameterExpression>) this._temps.ToReadOnlyCollection(), (IEnumerable <Expression>)expressions) : Expression.Block(expressions), new ParameterExpression[] { this._frameDataVar, this._frameClosureVar, this._frameVar }).Compile());
}
protected override Expression VisitGoto(GotoExpression node)
{
BranchLabel label;
LabelTarget key = node.Target;
Expression expression = this.Visit(node.Value);
if (!this._labelMapping.TryGetValue(key, out label))
{
return(node.Update(key, expression));
}
if ((label.TargetIndex >= this._loopStartInstructionIndex) && (label.TargetIndex < this._loopEndInstructionIndex))
{
return(node.Update(key, expression));
}
return(Expression.Return(this._returnLabel, ((expression != null) && (expression.Type != typeof(void))) ? Expression.Call(this._frameVar, InterpretedFrame.GotoMethod, Expression.Constant(label.LabelIndex), Utils.Box(expression)) : Expression.Call(this._frameVar, InterpretedFrame.VoidGotoMethod, new Expression[] { Expression.Constant(label.LabelIndex) }), node.Type));
}