[change] validate unsupported parameter type(.e.g string) in PInvoke signature when generate MethodBridge file

Editor/MethodBridge/PInvokeAnalyzer.cs

@@ -26,6 +26,30 @@ namespace HybridCLR.Editor.MethodBridge
             }
         }
 
+        private static bool IsSupportedPInvokeTypeSig(TypeSig typeSig)
+        {
+            typeSig = typeSig.RemovePinnedAndModifiers();
+            if (typeSig.IsByRef)
+            {
+                return true;
+            }
+            switch (typeSig.ElementType)
+            {
+                case ElementType.SZArray:
+                case ElementType.Array:
+                //case ElementType.Class:
+                case ElementType.String:
+                //case ElementType.Object:
+                return false;
+                default: return true;
+            }
+        }
+
+        private static bool IsSupportedPInvokeMethodSignature(MethodSig methodSig)
+        {
+            return IsSupportedPInvokeTypeSig(methodSig.RetType) && methodSig.Params.All(p => IsSupportedPInvokeTypeSig(p));
+        }
+
         public void Run()
         {
             foreach (var mod in _rootModules)
@@ -36,6 +60,10 @@ namespace HybridCLR.Editor.MethodBridge
                     {
                         if (method.IsPinvokeImpl)
                         {
+                            if (!IsSupportedPInvokeMethodSignature(method.MethodSig))
+                            {
+                                throw new Exception($"PInvoke method {method.FullName} has unsupported parameter or return type. Please check the method signature.");
+                            }
                             _pinvokeMethodSignatures.Add(new CallNativeMethodSignatureInfo { MethodSig = method.MethodSig });
                         }
                     }