备份，准备做双端

Assets/scripts/Combat/SkillDefinition.cs

@@ -9,6 +9,11 @@ public class SkillDefinition : ScriptableObject
     // Cache compiled RPN for formulas to avoid re-tokenizing every trigger.
     private static readonly Dictionary<string, List<Token>> s_rpnCache = new Dictionary<string, List<Token>>();
     private static readonly HashSet<string> s_badFormulaCache = new HashSet<string>();
+    // Reused across EvalRPN calls to avoid a per-evaluation allocation. Formula eval runs
+    // synchronously on the main thread and is not re-entrant, so a shared instance is safe.
+    private static readonly Stack<float> s_evalStack = new Stack<float>();
+    // Warn once per unknown variable name instead of on every evaluation.
+    private static readonly HashSet<string> s_warnedUnknownVars = new HashSet<string>();
     public enum SkillTrigger
     {
         None,
@@ -301,7 +306,8 @@ public class SkillDefinition : ScriptableObject
 
     private static float EvalRPN(List<Token> rpn, Dictionary<string, float> vars)
     {
-        var st = new Stack<float>();
+        var st = s_evalStack;
+        st.Clear();
         foreach (var t in rpn)
         {
             if (t.type == TokType.Number)
@@ -314,8 +320,11 @@ public class SkillDefinition : ScriptableObject
                 if (vars != null && vars.TryGetValue(t.text, out float v)) st.Push(v);
                 else
                 {
-                    // unknown identifiers treat as 0 but warn
-                    Debug.LogWarning($"SkillDefinition: unknown variable '{t.text}' in formula, treated as 0");
+                    // unknown identifiers treat as 0 but warn (once per unique name)
+                    if (s_warnedUnknownVars.Add(t.text))
+                    {
+                        Debug.LogWarning($"SkillDefinition: unknown variable '{t.text}' in formula, treated as 0");
+                    }
                     st.Push(0f);
                 }
             }