void IILCode.Generate(ILExpressed il)
{
var variableType = il.TypeCache.Extend(_enumerable.ParameterType);
var collectionContainer = variableType.Container.AsCollection();
if (collectionContainer == null)
throw new InvalidOperationException("Could not enumerate the type " + variableType.Ref.FullName);
var elementType = collectionContainer.ElementType;
il.Var.Load(_enumerable);
var enumerableType = typeof(IEnumerable<>).MakeGenericType(elementType);
var getEnumeratorMethod = enumerableType.GetMethod("GetEnumerator");
il.CallVirt(getEnumeratorMethod);
var enumeratorType = typeof(IEnumerator<>).MakeGenericType(elementType);
var itLocal = il.DeclareLocal("it", enumeratorType);
il.Var.Set(itLocal);
il.Try();
var itHeadLabel = il.DefineLabel();
var itBodyLabel = il.DefineLabel();
il.TransferLong(itHeadLabel);
var itVarLocal = il.DeclareLocal("cv", elementType);
var getCurrentMethod = enumeratorType.GetProperty("Current").GetGetMethod();
il.MarkLabel(itBodyLabel);
il.Var.Load(itLocal);
il.Call(getCurrentMethod);
il.Var.Set(itVarLocal);
_iterateBody.Invoke(il, itVarLocal);
il.MarkLabel(itHeadLabel);
il.Var.Load(itLocal);
il.CallVirt(EnumeratorMoveNext);
il.TransferLongIfTrue(itBodyLabel);
il.Finally();
il.Var.Load(itLocal);
il.LoadNull();
il.CompareEquals();
var endLabel = il.DefineLabel();
il.TransferLongIfTrue(endLabel);
il.Var.Load(itLocal);
il.CallVirt(DisposableDispose);
il.MarkLabel(endLabel);
il.EndTry();
}
void IILCode.Generate(ILExpressed il)
{
var value = il.DeclareLocal("index", _initialValue.ParameterType);
il.Snippets.SetVariable(value, _initialValue);
var labelCondition = il.DefineLabel();
il.TransferLong(labelCondition);
var labelBody = il.DefineAndMarkLabel();
_bodyHandler.Invoke(il, value);
il.Snippets.Increment(value, _increment);
il.MarkLabel(labelCondition);
_conditionHandler.Invoke(il, value);
il.TransferLongIfTrue(labelBody);
}
