handle possibility of missing static class (UMapProperty)

src/v2_types/mod.rs

@@ -170,10 +170,34 @@ macro_rules! define_utypes {
             #[derive(Debug, Clone, Copy)]
             pub struct $ty(NonNull<UnsafeCell<()>>);
 
-            impl $ty {
+            impl traits::StaticClass for $ty {
-                pub const fn static_class_name() -> &'static str {
+                fn static_class_name() -> &'static str {
                     concat!("Class CoreUObject.", $name)
                 }
+
+                fn static_class() -> Option<UClass> {
+                    use crate::global_tables::objects::{FindClass, GOBJECTS};
+                    use once_cell::sync::OnceCell;
+                    // this is something that we always do in C/C++ but unfortinately requires a blanket impl Sync + Send on all UObject types..
+                    static CLASS: OnceCell<Option<UClass>> = OnceCell::new();
+
+                    *CLASS.get_or_init(|| {
+                        let class = match GOBJECTS
+                            .read()
+                            .unwrap()
+                            .as_objects()
+                            .unwrap()
+                            .find_class(Self::static_class_name()) {
+                                Some(class) => {Some(class)},
+                                None => {
+                                    log::error!("static class \"{}\" not found!", Self::static_class_name());
+                                    None
+                                }
+                            };
+                        log::info!("class for {} is {:?}", Self::static_class_name(), class);
+                        class
+                    })
+                }
             }
 
             impl_asuobject!($ty);
@@ -192,6 +216,30 @@ macro_rules! define_utypes {
                 fn static_class_name() -> &'static str {
                     concat!("Class CoreUObject.", $name)
                 }
+
+                fn static_class() -> Option<UClass> {
+                    use crate::global_tables::objects::{FindClass, GOBJECTS};
+                    use once_cell::sync::OnceCell;
+                    // this is something that we always do in C/C++ but unfortinately requires a blanket impl Sync + Send on all UObject types..
+                    static CLASS: OnceCell<Option<UClass>> = OnceCell::new();
+
+                    *CLASS.get_or_init(|| {
+                        let class = match GOBJECTS
+                            .read()
+                            .unwrap()
+                            .as_objects()
+                            .unwrap()
+                            .find_class(Self::static_class_name()) {
+                                Some(class) => {Some(class)},
+                                None => {
+                                    log::error!("static class \"{}\" not found!", Self::static_class_name());
+                                    None
+                                }
+                            };
+                        log::info!("class for {} is {:?}", Self::static_class_name(), class);
+                        class
+                    })
+                }
             }
 
             impl_asuobject!($ty);
@@ -453,15 +501,19 @@ impl UAnyType {
         // remember to order this from most specialized to least.
         // specifically: a UClass is also a UStruct, so check for UClass first,
         // then for any other subtypes of UStruct, then for UStruct
-        if uobject.is_a(&UEnum::static_class()) {
+        if uobject.is_a_maybe(&UClass::static_class()) {
-            Self::UEnum(unsafe { uobject.cast() })
-        } else if uobject.is_a(&UClass::static_class()) {
             Self::UClass(unsafe { uobject.cast() })
-        } else if uobject.is_a(&UScriptStruct::static_class()) {
+        } else if uobject.is_a_maybe(&UProperty::static_class()) {
+            Self::UProperty(unsafe { uobject.cast() })
+        } else if uobject.is_a_maybe(&UFunction::static_class()) {
+            Self::UFunction(unsafe { uobject.cast() })
+        } else if uobject.is_a_maybe(&UScriptStruct::static_class()) {
             Self::UScriptStruct(unsafe { uobject.cast() })
-        } else if uobject.is_a(&UStruct::static_class()) {
+        } else if uobject.is_a_maybe(&UEnum::static_class()) {
+            Self::UEnum(unsafe { uobject.cast() })
+        } else if uobject.is_a_maybe(&UStruct::static_class()) {
             Self::UStruct(unsafe { uobject.cast() })
-        } else if uobject.is_a(&UField::static_class()) {
+        } else if uobject.is_a_maybe(&UField::static_class()) {
             Self::UField(unsafe { uobject.cast() })
         } else {
             Self::UObject(uobject)
@@ -497,30 +549,15 @@ pub mod traits {
 
     use anyhow::Context;
     use itertools::Itertools;
-    use once_cell::sync::OnceCell;
 
     use crate::fname::FName;
-    use crate::global_tables::objects::{FindClass, GOBJECTS};
     use crate::tarray::{FString, TArray};
 
     use super::{EObjectFlags, VTbl};
 
     pub trait StaticClass {
         fn static_class_name() -> &'static str;
-        fn static_class() -> super::UClass {
+        fn static_class() -> Option<super::UClass>;
-            // this is something that we always do in C/C++ but unfortinately requires a blanket impl Sync + Send on all UObject types..
-            static CLASS: OnceCell<super::UClass> = OnceCell::new();
-
-            *CLASS.get_or_init(|| {
-                GOBJECTS
-                    .read()
-                    .unwrap()
-                    .as_objects()
-                    .unwrap()
-                    .find_class(Self::static_class_name())
-                    .expect("static class not found!")
-            })
-        }
     }
 
     #[const_trait]
@@ -601,6 +638,13 @@ pub mod traits {
                 .map(|class| class.iter_super_classes().contains(other))
                 .unwrap_or(false)
         }
+
+        fn is_a_maybe(&self, other: &Option<super::UClass>) -> bool {
+            other
+                .as_ref()
+                .map(|class| self.is_a(class))
+                .unwrap_or(false)
+        }
     }
 
     impl<T> UObjectNonConst for T where T: UObjectTrait {}