fix: fail the build with a descriptive error message when the users t…

…ries to export functions with parameters
extism · Nov 20, 2023 · aa7eb87 · aa7eb87
1 parent ef3f034
commit aa7eb87
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/src/Extism.Pdk.MSBuild/FFIGenerator.cs b/src/Extism.Pdk.MSBuild/FFIGenerator.cs
@@ -149,6 +149,12 @@ void extism_print_exception(MonoObject* exc)
 
                 foreach (var method in exportedMethods)
                 {
+                    if (method.Parameters.Count > 0)
+                    {
+                        var parameterNames = string.Join(",", method.Parameters.Select(p => $"{p.ParameterType.Name} {p.Name}"));
+                        _logError($"Extism doesn't support exporting functions that have parameters: {method.DeclaringType.FullName}.{method.Name}({parameterNames})");
+                    }
+
                     var assemblyFileName = method.Module.Assembly.Name.Name + ".dll";
                     var attribute = method.CustomAttributes.First(a => a.AttributeType.Name == "UnmanagedCallersOnlyAttribute");