public ILEmitter Emit(ILEmitter il, LocalBuilder hash)
{
il.Emit(_variable.Load(Arg.Input))
.Stloc(_variable.VariableType, out var enumerable)
.DefineLabel(out var end);
if (!_variable.VariableType.IsValueType)
{
il.Brtrue_S(Ldloc(enumerable), out var begin)
.Ldc_I4(0)
.Br(end)
.MarkLabel(begin);
}
if (_configuration.Get(_variable.OwnerType).IgnoreCollectionOrder)
{
return(EmitHashAsSortedArray(il, enumerable, hash).MarkLabel(end));
}
il.CallMethod(_getEnumeratorMethod, LoadCaller(enumerable))
.Stloc(_enumeratorType, out var enumerator)
.DefineLabel(out var loopStart);
if (!_enumeratorType.IsValueType)
{
il.Brtrue_S(Ldloc(enumerator), loopStart)
.Ldc_I4(0)
.Br(end);
}
// todo: 1. think how to use try/finally block
// the problem now with the inner `return` statements, it has to be `leave` instruction
//il.BeginExceptionBlock();
Loop(il, enumerator, loopStart, hash);
//il.BeginFinallyBlock();
EmitDisposeEnumerator(il, enumerator);
//il.EndExceptionBlock();
return(il.Ldloc(hash).MarkLabel(end));
}
private static void EmitCycleDetection(ILEmitter il, Type objectType) => il.Brtrue_S(TryAdd(Arg.CycleSet, Arg.Input, objectType), out var next) .Emit(GetCount(Arg.CycleSet)) .Stloc(typeof(int), out var count) .Ret(CallMethod(_getHashCodeMethod, LoadCaller(count))) .MarkLabel(next);