Introduce IdentifierManager to improve PDT evaluator performance.

Assets/Cryville/Common/Pdt/PdtExpression.cs

@@ -50,43 +50,38 @@ namespace Cryville.Common.Pdt {
 			}
 		}
 		public class PushVariable : PdtInstruction {
-			private string m_name;
-			public string Name { get { return m_name; } }
+			public int Name { get; private set; }
 			public PushVariable(string name) {
-				m_name = name;
+				Name = IdentifierManager.SharedInstance.Request(name);
 			}
 			internal override void Execute(PdtEvaluatorBase etor) {
-				etor.PushVariable(ref m_name);
+				etor.PushVariable(Name);
 			}
 			public override string ToString() {
 				return string.Format("pushv {0}", Name);
 			}
 		}
 		public class Operate : PdtInstruction {
-			private string m_name;
-			public string Name { get { return m_name; } }
-			public int ParamCount { get; private set; }
+			public PdtOperatorSignature Signature { get; private set; }
 			public Operate(string name, int paramCount) {
-				m_name = name;
-				ParamCount = paramCount;
+				Signature = new PdtOperatorSignature(name, paramCount);
 			}
 			internal override void Execute(PdtEvaluatorBase etor) {
-				etor.Operate(ref m_name, ParamCount);
+				etor.Operate(Signature);
 			}
 			public override string ToString() {
-				return string.Format("op {0}({1})", Name, ParamCount);
+				return string.Format("op {0}", Signature);
 			}
 		}
 		public class Collapse : PdtInstruction {
-			private string m_name;
-			public string Name { get { return m_name; } }
+			public int Name { get; private set; }
 			public LinkedListNode<PdtInstruction> Target { get; internal set; }
 			public Collapse(string name, LinkedListNode<PdtInstruction> target) {
-				m_name = name;
+				Name = IdentifierManager.SharedInstance.Request(name);
 				Target = target;
 			}
 			internal override void Execute(PdtEvaluatorBase etor) {
-				etor.Collapse(ref m_name, Target);
+				etor.Collapse(Name, Target);
 			}
 			public override string ToString() {
 				return string.Format("col {0}{{{1}}}", Name, Target.Value);