Function CheckCircularReference

Source/SpireCore/Closure.cpp:639–672

		}

		bool CheckCircularReference(DiagnosticSink * err, ShaderClosure * shader)
		{
			bool rs = false;
			for (auto & comp : shader->AllComponents)
			{
				for (auto & impl : comp.Value.Symbol->Implementations)
				{
					// check circular references
					HashSet<ShaderComponentSymbol*> set;
					List<ShaderComponentSymbol*> referredComponents;
					referredComponents.Add(comp.Value.Symbol);
					for (int i = 0; i < referredComponents.Count(); i++)
					{
						auto xcomp = referredComponents[i];
						for (auto & xcompImpl : xcomp->Implementations)
						{
							for (auto & rcomp : xcompImpl->DependentComponents)
							{
								if (set.Add(rcomp.Key))
								{
									referredComponents.Add(rcomp.Key);
								}
								if (rcomp.Key == comp.Value.Symbol)
								{
									err->diagnose(impl->SyntaxNode->Position, Diagnostics::circularReferenceNotAllowed, rcomp.Key->Name);
									rs = true;
								}
							}
						}
					}
				}
			}
			return rs;
		}

		void PropagateArgumentConstraints(ShaderComponentSymbol * requirement, ShaderComponentSymbol * arg)
		{