Rework in line with PkmnLib for moving towards Result

Cargo.toml

@@ -12,3 +12,6 @@ opt-level = "s"
 lto = false
 debug-assertions = true
 
+[profile.release.package."*"]
+opt-level = "s"
+debug-assertions = false

gen_7_scripts/src/common_usings.rs

@@ -1,12 +1,13 @@
 pub use crate::script;
 pub use alloc::boxed::Box;
 pub use alloc::rc::Rc;
+pub use alloc::vec::Vec;
 pub use atomic_float::AtomicF32;
 pub use core::any::Any;
 pub use core::sync::atomic::{AtomicBool, AtomicI8, AtomicU32, Ordering};
-pub use pkmn_lib_interface::app_interface::list::ImmutableList;
 pub use pkmn_lib_interface::app_interface::{
     get_volatile_as, BattleSide, DamageSource, DynamicLibrary, EffectParameter, ExecutingMove,
     Gender, MoveCategory, MoveData, Party, Pokemon, Statistic, StringKey, TurnChoice,
 };
 pub use pkmn_lib_interface::handling::{Script, ScriptCapabilities, ScriptOwner};
+pub use pkmn_lib_interface::PkmnResult;

gen_7_scripts/src/moves/acrobatics.rs

@@ -1,4 +1,5 @@
 use crate::common_usings::*;
+use pkmn_lib_interface::PkmnResult;
 
 script!(Acrobatics, "acrobatics");
 
@@ -21,14 +22,15 @@ impl Script for Acrobatics {
         _target: Pokemon,
         _hit: u8,
         base_power: &mut u8,
-    ) {
+    ) -> PkmnResult<()> {
-        if mv.user().held_item().is_none() {
+        if mv.user().held_item()?.is_none() {
             if *base_power >= 128_u8 {
                 *base_power = 255
             } else {
                 *base_power *= 2;
             }
         }
+        Ok(())
     }
 
     fn as_any(&self) -> &dyn Any {
@@ -47,11 +49,11 @@ mod tests {
         mv.expect_user().returning(move || {
             let mut user = MockPokemon::new();
             user.expect_held_item().returning(move || {
-                if has_held_item {
+                Ok(if has_held_item {
                     Some(Rc::new(MockItem::new()))
                 } else {
                     None
-                }
+                })
             });
             Rc::new(user)
         });
@@ -64,7 +66,9 @@ mod tests {
 
         let script = Acrobatics::new();
         let mut base_power = 50u8;
-        script.change_base_power(mv, Rc::new(MockPokemon::new()), 0, &mut base_power);
+        script
+            .change_base_power(mv, Rc::new(MockPokemon::new()), 0, &mut base_power)
+            .unwrap();
         assert_eq!(100, base_power);
     }
 
@@ -74,7 +78,9 @@ mod tests {
 
         let script = Acrobatics::new();
         let mut base_power = 200u8;
-        script.change_base_power(mv, Rc::new(MockPokemon::new()), 0, &mut base_power);
+        script
+            .change_base_power(mv, Rc::new(MockPokemon::new()), 0, &mut base_power)
+            .unwrap();
         assert_eq!(255, base_power);
     }
 
@@ -84,7 +90,9 @@ mod tests {
 
         let script = Acrobatics::new();
         let mut base_power = 50u8;
-        script.change_base_power(mv, Rc::new(MockPokemon::new()), 0, &mut base_power);
+        script
+            .change_base_power(mv, Rc::new(MockPokemon::new()), 0, &mut base_power)
+            .unwrap();
         assert_eq!(50, base_power);
     }
 }

gen_7_scripts/src/moves/acupressure.rs

@@ -1,5 +1,6 @@
 use crate::common_usings::*;
 use core::mem::transmute;
+use pkmn_lib_interface::PkmnResult;
 
 pub struct Acupressure {}
 
@@ -22,14 +23,15 @@ impl Script for Acupressure {
         &[ScriptCapabilities::OnSecondaryEffect]
     }
 
-    fn on_secondary_effect(&self, mv: ExecutingMove, target: Pokemon, hit: u8) {
+    fn on_secondary_effect(&self, mv: ExecutingMove, target: Pokemon, hit: u8) -> PkmnResult<()> {
         if target.equals(&mv.user()) {
-            mv.get_hit_data(&target, hit).fail();
+            mv.get_hit_data(&target, hit)?.fail()?;
-            return;
+            return Ok(());
         }
         let rand_stat: Statistic =
-            unsafe { transmute(target.battle().unwrap().random().get_between(1, 6) as u8) };
+            unsafe { transmute(target.battle()?.unwrap().random().get_between(1, 6)? as u8) };
-        target.change_stat_boost(rand_stat, 2, false);
+        target.change_stat_boost(rand_stat, 2, false)?;
+        Ok(())
     }
 
     fn as_any(&self) -> &dyn Any {
@@ -56,13 +58,13 @@ mod tests {
         mv.expect_user().returning_st(move || user.clone());
 
         let mut hit_data = MockHitData::new();
-        hit_data.expect_fail().once();
+        hit_data.expect_fail().returning(|| Ok(())).once();
         let hit_data = Rc::new(hit_data);
         mv.expect_get_hit_data()
-            .returning_st(move |_, _| hit_data.clone());
+            .returning_st(move |_, _| Ok(hit_data.clone()));
 
         let script = Acupressure::new();
-        script.on_secondary_effect(Rc::new(mv), u, 0);
+        script.on_secondary_effect(Rc::new(mv), u, 0).unwrap();
     }
 
     #[test]
@@ -76,11 +78,11 @@ mod tests {
                 random.expect_get_between().returning_st(|low, high| {
                     assert_eq!(1, low);
                     assert_eq!(6, high);
-                    1
+                    Ok(1)
                 });
                 Rc::new(random)
             });
-            Some(Rc::new(battle))
+            Ok(Some(Rc::new(battle)))
         });
         user.expect_change_stat_boost()
             .once()
@@ -88,7 +90,7 @@ mod tests {
                 assert_eq!(Statistic::Attack, stat);
                 assert_eq!(2, amount);
                 assert!(!self_inflicted);
-                true
+                Ok(true)
             });
 
         let user = Rc::new(user);
@@ -98,6 +100,6 @@ mod tests {
         mv.expect_user().returning_st(move || user.clone());
 
         let script = Acupressure::new();
-        script.on_secondary_effect(Rc::new(mv), u, 0);
+        script.on_secondary_effect(Rc::new(mv), u, 0).unwrap();
     }
 }

gen_7_scripts/src/moves/after_you.rs

@@ -1,4 +1,5 @@
 use crate::common_usings::*;
+use pkmn_lib_interface::PkmnResult;
 
 pub struct AfterYou {}
 
@@ -21,15 +22,16 @@ impl Script for AfterYou {
         &[ScriptCapabilities::OnSecondaryEffect]
     }
 
-    fn on_secondary_effect(&self, mv: ExecutingMove, target: Pokemon, hit: u8) {
+    fn on_secondary_effect(&self, mv: ExecutingMove, target: Pokemon, hit: u8) -> PkmnResult<()> {
         if !target
-            .battle()
+            .battle()?
             .unwrap()
             .choice_queue()
-            .move_pokemon_choice_next(&target)
+            .move_pokemon_choice_next(&target)?
         {
-            mv.get_hit_data(&target, hit).fail()
+            mv.get_hit_data(&target, hit)?.fail()?
         }
+        Ok(())
     }
 
     fn as_any(&self) -> &dyn Any {
@@ -53,7 +55,7 @@ mod tests {
             choice_queue
                 .expect_move_pokemon_choice_next()
                 .once()
-                .return_const(true);
+                .returning_st(move |_| Ok(true));
             Rc::new(choice_queue)
         });
 
@@ -62,11 +64,13 @@ mod tests {
         target
             .expect_battle()
             .once()
-            .return_once_st(move || Some(battle));
+            .return_once_st(move || Ok(Some(battle)));
         let target = Rc::new(target);
 
         let script = AfterYou::new();
-        script.on_secondary_effect(Rc::new(MockExecutingMove::new()), target, 0);
+        script
+            .on_secondary_effect(Rc::new(MockExecutingMove::new()), target, 0)
+            .unwrap();
     }
 
     #[test]
@@ -77,7 +81,7 @@ mod tests {
             choice_queue
                 .expect_move_pokemon_choice_next()
                 .once()
-                .return_const(false);
+                .returning_st(move |_| Ok(false));
             Rc::new(choice_queue)
         });
 
@@ -86,18 +90,18 @@ mod tests {
         target
             .expect_battle()
             .once()
-            .return_once_st(move || Some(battle));
+            .return_once_st(move || Ok(Some(battle)));
         let target = Rc::new(target);
 
         let mut mv = MockExecutingMove::new();
         mv.expect_get_hit_data().once().returning_st(move |_, _| {
             let mut hit = MockHitData::new();
-            hit.expect_fail().once();
+            hit.expect_fail().returning(|| Ok(())).once();
-            Rc::new(hit)
+            Ok(Rc::new(hit))
         });
         let mv = Rc::new(mv);
 
         let script = AfterYou::new();
-        script.on_secondary_effect(mv, target, 0);
+        script.on_secondary_effect(mv, target, 0).unwrap();
     }
 }

gen_7_scripts/src/moves/assist.rs

@@ -1,12 +1,13 @@
 use crate::common_usings::*;
 use alloc::vec::Vec;
+use pkmn_lib_interface::PkmnResult;
 
 script!(Assist, "assist");
 
 impl Assist {
     /// Gets all the learned moves from the entire party, except the ones from the user, and the ones
     /// that are not allowed to be copied.
-    fn get_party_moves(party: &Party, user: &Pokemon) -> Vec<MoveData> {
+    fn get_party_moves(party: &Party, user: &Pokemon) -> PkmnResult<Vec<MoveData>> {
         let mut possible_moves = Vec::new();
         // Iterate over every mon in the party
         for mon in party.into_iter().flatten() {
@@ -16,7 +17,7 @@ impl Assist {
             }
             // Iterate over all moves. We make the assumption of 4 moves.
             for move_index in 0..4 {
-                let mv = mon.get_learned_move(move_index);
+                let mv = mon.get_learned_move(move_index)?;
                 if let Some(mv) = mv {
                     // Make sure we can copy the move, otherwise add it as possible move.
                     if crate::utils::copyable_moves::can_copy_move(&mv.move_data()) {
@@ -25,7 +26,7 @@ impl Assist {
                 }
             }
         }
-        possible_moves
+        Ok(possible_moves)
     }
 }
 
@@ -42,24 +43,25 @@ impl Script for Assist {
         &[ScriptCapabilities::ChangeMove]
     }
 
-    fn change_move(&self, choice: TurnChoice, move_name: &mut StringKey) {
+    fn change_move(&self, choice: TurnChoice, move_name: &mut StringKey) -> PkmnResult<()> {
         let user = choice.user();
-        let battle = user.battle().unwrap();
+        let battle = user.battle()?.unwrap();
-        let party = battle.find_party_for_pokemon(&user);
+        let party = battle.find_party_for_pokemon(&user)?;
         if party.is_none() {
-            choice.fail();
+            choice.fail()?;
-            return;
+            return Ok(());
         }
 
         let party = party.unwrap().party();
-        let possible_moves = Self::get_party_moves(&party, &user);
+        let possible_moves = Self::get_party_moves(&party, &user)?;
 
         if possible_moves.is_empty() {
-            choice.fail();
+            choice.fail()?;
-            return;
+            return Ok(());
         }
-        let random = battle.random().get_max(possible_moves.len() as i32);
+        let random = battle.random().get_max(possible_moves.len() as i32)?;
         *move_name = possible_moves[random as usize].name();
+        Ok(())
     }
 
     fn as_any(&self) -> &dyn Any {
@@ -93,9 +95,9 @@ mod tests {
                         .returning_st(move || moves.get(index).unwrap().clone());
                     Rc::new(move_data)
                 });
-                Some(Rc::new(learned_move))
+                Ok(Some(Rc::new(learned_move)))
             } else {
-                None
+                Ok(None)
             }
         });
         mon.expect_equals().return_const(equals_user);
@@ -105,16 +107,19 @@ mod tests {
     #[test]
     fn get_party_moves_returns_moves_from_party_length_1() {
         let mut party = MockParty::new();
-        party.expect_length().once().return_const(1usize);
+        party
+            .expect_length()
+            .once()
+            .returning_st(move || Ok(1usize));
         party
             .expect_get_pokemon()
             .times(1)
-            .returning_st(move |_| Some(mock_pokemon_with_moves(vec!["tackle".into()], false)));
+            .returning_st(move |_| Ok(Some(mock_pokemon_with_moves(vec!["tackle".into()], false))));
 
         let party: Party = Rc::new(party);
         let user: Pokemon = Rc::new(MockPokemon::new());
 
-        let moves = Assist::get_party_moves(&party, &user);
+        let moves = Assist::get_party_moves(&party, &user).unwrap();
         assert_eq!(1, moves.len());
         assert_eq!(moves[0].name(), "tackle".into())
     }
@@ -122,35 +127,38 @@ mod tests {
     #[test]
     fn get_party_moves_returns_moves_from_party_length_7() {
         let mut party = MockParty::new();
-        party.expect_length().once().return_const(3usize);
+        party
+            .expect_length()
+            .once()
+            .returning_st(move || Ok(3usize));
         party
             .expect_get_pokemon()
             .times(3)
             .returning_st(move |index| {
                 if index == 0 {
-                    Some(mock_pokemon_with_moves(
+                    Ok(Some(mock_pokemon_with_moves(
                         vec!["move1".into(), "move2".into(), "move3".into()],
                         false,
-                    ))
+                    )))
                 } else if index == 1 {
-                    Some(mock_pokemon_with_moves(
+                    Ok(Some(mock_pokemon_with_moves(
                         vec!["move1".into(), "move4".into()],
                         false,
-                    ))
+                    )))
                 } else if index == 2 {
-                    Some(mock_pokemon_with_moves(
+                    Ok(Some(mock_pokemon_with_moves(
                         vec!["move2".into(), "move5".into()],
                         false,
-                    ))
+                    )))
                 } else {
-                    None
+                    Ok(None)
                 }
             });
 
         let party: Party = Rc::new(party);
         let user: Pokemon = Rc::new(MockPokemon::new());
 
-        let moves = Assist::get_party_moves(&party, &user);
+        let moves = Assist::get_party_moves(&party, &user).unwrap();
         assert_eq!(7, moves.len());
         assert_eq!(moves[0].name(), "move1".into());
         assert_eq!(moves[1].name(), "move2".into());
@@ -164,12 +172,15 @@ mod tests {
     #[test]
     fn get_party_moves_ignores_user() {
         let mut party = MockParty::new();
-        party.expect_length().once().return_const(3usize);
+        party
+            .expect_length()
+            .once()
+            .returning_st(move || Ok(3usize));
         party
             .expect_get_pokemon()
             .times(3)
             .returning_st(move |index| {
-                if index == 0 {
+                Ok(if index == 0 {
                     Some(mock_pokemon_with_moves(
                         vec!["move1".into(), "move2".into(), "move3".into()],
                         false,
@@ -186,13 +197,13 @@ mod tests {
                     ))
                 } else {
                     None
-                }
+                })
             });
 
         let party: Party = Rc::new(party);
         let user: Pokemon = Rc::new(MockPokemon::new());
 
-        let moves = Assist::get_party_moves(&party, &user);
+        let moves = Assist::get_party_moves(&party, &user).unwrap();
         assert_eq!(5, moves.len());
         assert_eq!(moves[0].name(), "move1".into());
         assert_eq!(moves[1].name(), "move2".into());
@@ -204,26 +215,31 @@ mod tests {
     #[test]
     fn get_party_moves_ignores_non_copyable_move() {
         let mut party = MockParty::new();
-        party.expect_length().once().return_const(1usize);
         party
-            .expect_get_pokemon()
+            .expect_length()
-            .times(1)
+            .once()
-            .returning_st(move |_| Some(mock_pokemon_with_moves(vec!["chatter".into()], false)));
+            .returning_st(move || Ok(1usize));
+        party.expect_get_pokemon().times(1).returning_st(move |_| {
+            Ok(Some(mock_pokemon_with_moves(vec!["chatter".into()], false)))
+        });
         let party: Party = Rc::new(party);
         let user: Pokemon = Rc::new(MockPokemon::new());
 
-        let moves = Assist::get_party_moves(&party, &user);
+        let moves = Assist::get_party_moves(&party, &user).unwrap();
         assert_eq!(0, moves.len());
     }
 
     #[test]
     fn if_moves_found_assist_uses_that_move() {
         let mut party = MockParty::new();
-        party.expect_length().once().return_const(1usize);
+        party
+            .expect_length()
+            .once()
+            .returning_st(move || Ok(1usize));
         party
             .expect_get_pokemon()
             .times(1)
-            .returning_st(move |_| Some(mock_pokemon_with_moves(vec!["tackle".into()], false)));
+            .returning_st(move |_| Ok(Some(mock_pokemon_with_moves(vec!["tackle".into()], false))));
 
         let party: Party = Rc::new(party);
 
@@ -243,16 +259,16 @@ mod tests {
                         let mut p = MockBattleParty::new();
                         p.expect_party().returning_st(move || party.clone());
 
-                        Some(Rc::new(p))
+                        Ok(Some(Rc::new(p)))
                     });
 
                 battle.expect_random().returning_st(|| {
                     let mut random = MockBattleRandom::new();
-                    random.expect_get_max().return_const(0);
+                    random.expect_get_max().returning_st(move |_| Ok(0));
                     Rc::new(random)
                 });
 
-                Some(Rc::new(battle))
+                Ok(Some(Rc::new(battle)))
             });
 
             Rc::new(user)
@@ -270,7 +286,7 @@ mod tests {
 
         let mut move_name: StringKey = "".into();
         let script = Assist::new();
-        script.change_move(choice_data, &mut move_name);
+        script.change_move(choice_data, &mut move_name).unwrap();
         assert_eq!(move_name, "tackle".into())
     }
 }

gen_7_scripts/src/moves/assurance.rs

@@ -1,4 +1,5 @@
 use crate::common_usings::*;
+use pkmn_lib_interface::PkmnResult;
 
 script!(Assurance, "assurance");
 
@@ -18,20 +19,22 @@ impl Script for Assurance {
         ]
     }
 
-    fn on_before_turn(&self, choice: TurnChoice) {
+    fn on_before_turn(&self, choice: TurnChoice) -> PkmnResult<()> {
         if let TurnChoice::Move(data) = &choice {
             let side: BattleSide = choice
                 .user()
-                .battle()
+                .battle()?
                 .unwrap()
                 .sides()
-                .get(data.target_side() as u32)
+                .get(data.target_side() as usize)
-                .unwrap();
+                .unwrap()
+                .clone();
             side.add_volatile(Box::new(AssuranceData {
                 for_position: data.target_index(),
                 has_hit: AtomicBool::new(false),
-            }));
+            }))?;
         }
+        Ok(())
     }
 
     fn change_base_power(
@@ -40,15 +43,16 @@ impl Script for Assurance {
         target: Pokemon,
         _hit: u8,
         base_power: &mut u8,
-    ) {
+    ) -> PkmnResult<()> {
         if let Some(s) = get_volatile_as::<AssuranceData>(
-            target.battle_side().as_ref(),
+            target.battle_side()?.as_ref(),
             AssuranceData::get_const_name(),
-        ) {
+        )? {
             if s.has_hit.load(Ordering::Relaxed) {
                 *base_power *= 2;
             }
         }
+        Ok(())
     }
 
     fn as_any(&self) -> &dyn Any {
@@ -79,9 +83,10 @@ impl Script for AssuranceData {
         &[ScriptCapabilities::OnEndTurn, ScriptCapabilities::OnDamage]
     }
 
-    fn on_end_turn(&self) {
+    fn on_end_turn(&self) -> PkmnResult<()> {
         let side = self.get_owner().unwrap().as_side();
-        side.remove_volatile(self);
+        side.remove_volatile(self)?;
+        Ok(())
     }
 
     fn on_damage(
@@ -90,10 +95,11 @@ impl Script for AssuranceData {
         _source: DamageSource,
         _old_health: u32,
         _new_health: u32,
-    ) {
+    ) -> PkmnResult<()> {
-        if pokemon.battle_index() == self.for_position {
+        if pokemon.battle_index()? == self.for_position {
             self.has_hit.store(true, Ordering::Relaxed);
         }
+        Ok(())
     }
 
     fn as_any(&self) -> &dyn Any {

gen_7_scripts/src/moves/attract.rs

@@ -1,5 +1,6 @@
 use crate::common_usings::*;
 use crate::pokemon::infatuated::Infatuated;
+use pkmn_lib_interface::PkmnResult;
 
 script!(Attract, "attract");
 
@@ -16,19 +17,22 @@ impl Script for Attract {
         &[ScriptCapabilities::OnSecondaryEffect]
     }
 
-    fn on_secondary_effect(&self, mv: ExecutingMove, target: Pokemon, hit: u8) {
+    fn on_secondary_effect(&self, mv: ExecutingMove, target: Pokemon, hit: u8) -> PkmnResult<()> {
-        let user_gender = mv.user().gender();
+        let user_gender = mv.user().gender()?;
-        let target_gender = target.gender();
+        let target_gender = target.gender()?;
         // If the move is used on a Pokémon that is the same gender as the user, it will fail
         if target_gender == user_gender {
-            return mv.get_hit_data(&target, hit).fail();
+            mv.get_hit_data(&target, hit)?.fail()?;
+            return Ok(());
         }
         // It will also fail if used by or on a gender-unknown Pokémon
         if user_gender == Gender::Genderless || target_gender == Gender::Genderless {
-            return mv.get_hit_data(&target, hit).fail();
+            mv.get_hit_data(&target, hit)?.fail()?;
+            return Ok(());
         }
         // If the target is the opposite gender of the Pokémon who launched the move, the target becomes infatuated
-        target.add_volatile_by_name(Infatuated::get_const_name());
+        target.add_volatile_by_name(Infatuated::get_const_name())?;
+        Ok(())
     }
 
     fn as_any(&self) -> &dyn Any {

gen_7_scripts/src/moves/aurora_veil.rs

@@ -2,6 +2,7 @@ use crate::common_usings::*;
 use crate::moves::light_screen::LightScreenEffect;
 use crate::moves::reflect::ReflectEffect;
 use crate::weather::hail::Hail;
+use pkmn_lib_interface::PkmnResult;
 
 script!(AuroraVeil, "aurora_veil");
 
@@ -18,21 +19,27 @@ impl Script for AuroraVeil {
         &[ScriptCapabilities::OnSecondaryEffect]
     }
 
-    fn on_secondary_effect(&self, mv: ExecutingMove, target: Pokemon, hit: u8) {
+    fn on_secondary_effect(&self, mv: ExecutingMove, target: Pokemon, hit: u8) -> PkmnResult<()> {
-        if target.battle().unwrap().has_weather(Hail::get_const_name()) {
+        if target
-            return mv.get_hit_data(&target, hit).fail();
+            .battle()?
+            .unwrap()
+            .has_weather(Hail::get_const_name())?
+        {
+            mv.get_hit_data(&target, hit)?.fail()?;
+            return Ok(());
         }
-        let binding = target.battle_side();
+        let binding = target.battle_side()?;
         let script = binding
-            .add_volatile(Box::new(AuroraVeilEffect::new()))
+            .add_volatile(Box::new(AuroraVeilEffect::new()))?
             .as_any()
             .downcast_ref::<AuroraVeilEffect>()
             .unwrap();
-        if mv.user().has_held_item("light_clay") {
+        if mv.user().has_held_item("light_clay")? {
             script.turns.store(8, Ordering::SeqCst);
         } else {
             script.turns.store(5, Ordering::SeqCst);
         }
+        Ok(())
     }
 
     fn as_any(&self) -> &dyn Any {
@@ -66,30 +73,32 @@ impl Script for AuroraVeilEffect {
         target: Pokemon,
         hit: u8,
         damage: &mut u32,
-    ) {
+    ) -> PkmnResult<()> {
-        if mv.get_hit_data(&target, hit).is_critical() {
+        if mv.get_hit_data(&target, hit)?.is_critical()? {
-            return;
+            return Ok(());
         }
         let side = self.get_owner().unwrap().as_side();
-        if side.has_volatile(ReflectEffect::get_const_name())
+        if side.has_volatile(ReflectEffect::get_const_name())?
             && mv.use_move().category() == MoveCategory::Physical
         {
-            return;
+            return Ok(());
         }
-        if side.has_volatile(LightScreenEffect::get_const_name())
+        if side.has_volatile(LightScreenEffect::get_const_name())?
             && mv.use_move().category() == MoveCategory::Special
         {
-            return;
+            return Ok(());
         }
         let mut modifier = 2.0;
-        if target.battle().unwrap().pokemon_per_side() > 1 {
+        if target.battle()?.unwrap().pokemon_per_side()? > 1 {
             modifier = 1.5
         }
         *damage = (*damage as f32 / modifier) as u32;
+        Ok(())
     }
 
-    fn on_end_turn(&self) {
+    fn on_end_turn(&self) -> PkmnResult<()> {
-        todo!()
+        // TODO
+        Ok(())
     }
 
     fn as_any(&self) -> &dyn Any {

gen_7_scripts/src/moves/automize.rs

@@ -1,4 +1,5 @@
 use crate::common_usings::*;
+use pkmn_lib_interface::PkmnResult;
 
 script!(Automize, "automize");
 
@@ -15,18 +16,19 @@ impl Script for Automize {
         &[ScriptCapabilities::OnSecondaryEffect]
     }
 
-    fn on_secondary_effect(&self, mv: ExecutingMove, _target: Pokemon, _hit: u8) {
+    fn on_secondary_effect(&self, mv: ExecutingMove, _target: Pokemon, _hit: u8) -> PkmnResult<()> {
         let user = mv.user();
         let stats = user.boosted_stats();
-        let original_speed = stats.speed();
+        let original_speed = stats.speed()?;
-        let original_weight = user.weight();
+        let original_weight = user.weight()?;
-        user.change_stat_boost(Statistic::Speed, 2, true);
+        user.change_stat_boost(Statistic::Speed, 2, true)?;
-        if user.boosted_stats().speed() != original_speed {
+        if user.boosted_stats().speed()? != original_speed {
             user.set_weight(original_weight - 100.0);
-            if user.weight() != original_weight {
+            if user.weight()? != original_weight {
                 // TODO: Became nimble dialog.
             }
         }
+        Ok(())
     }
 
     fn as_any(&self) -> &dyn Any {

gen_7_scripts/src/moves/change_all_target_stats.rs

@@ -1,4 +1,6 @@
 use crate::common_usings::*;
+use alloc::vec::Vec;
+use pkmn_lib_interface::PkmnResult;
 
 script!(
     ChangeAllTargetStats,
@@ -27,22 +29,24 @@ impl Script for ChangeAllTargetStats {
     fn on_initialize(
         &self,
         _library: DynamicLibrary,
-        parameters: Option<ImmutableList<Rc<EffectParameter>>>,
+        parameters: Option<Vec<Rc<EffectParameter>>>,
-    ) {
+    ) -> PkmnResult<()> {
         self.amount.store(
             parameters.unwrap().get(0).unwrap().as_int() as i8,
             Ordering::SeqCst,
         );
+        Ok(())
     }
 
-    fn on_secondary_effect(&self, mv: ExecutingMove, target: Pokemon, _hit: u8) {
+    fn on_secondary_effect(&self, mv: ExecutingMove, target: Pokemon, _hit: u8) -> PkmnResult<()> {
         let user = mv.user();
         let amount = self.amount.load(Ordering::SeqCst);
-        target.change_stat_boost(Statistic::Attack, amount, user.equals(&target));
+        target.change_stat_boost(Statistic::Attack, amount, user.equals(&target))?;
-        target.change_stat_boost(Statistic::Defense, amount, user.equals(&target));
+        target.change_stat_boost(Statistic::Defense, amount, user.equals(&target))?;
-        target.change_stat_boost(Statistic::SpecialAttack, amount, user.equals(&target));
+        target.change_stat_boost(Statistic::SpecialAttack, amount, user.equals(&target))?;
-        target.change_stat_boost(Statistic::SpecialDefense, amount, user.equals(&target));
+        target.change_stat_boost(Statistic::SpecialDefense, amount, user.equals(&target))?;
-        target.change_stat_boost(Statistic::Speed, amount, user.equals(&target));
+        target.change_stat_boost(Statistic::Speed, amount, user.equals(&target))?;
+        Ok(())
     }
 
     fn as_any(&self) -> &dyn Any {

gen_7_scripts/src/moves/change_target_stats.rs

@@ -36,20 +36,22 @@ macro_rules! change_stat_effect {
                 fn on_initialize(
                     &self,
                     _library: DynamicLibrary,
-                    parameters: Option<ImmutableList<Rc<EffectParameter>>>,
+                    parameters: Option<Vec<Rc<EffectParameter>>>,
-                ) {
+                ) -> PkmnResult<()> {
                     self.amount.store(
                         parameters.unwrap().get(0).unwrap().as_int() as i8,
                         Ordering::SeqCst,
                     );
+                    Ok(())
                 }
 
-                fn on_secondary_effect(&self, mv: ExecutingMove, target: Pokemon, _hit: u8) {
+                fn on_secondary_effect(&self, mv: ExecutingMove, target: Pokemon, _hit: u8) -> PkmnResult<()> {
                     target.change_stat_boost(
                         Statistic::$stat,
                         self.amount.load(Ordering::SeqCst),
                         mv.user().equals(&target),
-                    );
+                    )?;
+                    Ok(())
                 }
 
                 fn as_any(&self) -> &dyn Any {

gen_7_scripts/src/moves/cure_party_status.rs

@@ -15,21 +15,19 @@ impl Script for CurePartyStatus {
         &[ScriptCapabilities::OnSecondaryEffect]
     }
 
-    fn on_secondary_effect(&self, mv: ExecutingMove, _target: Pokemon, _hit: u8) {
+    fn on_secondary_effect(&self, mv: ExecutingMove, _target: Pokemon, _hit: u8) -> PkmnResult<()> {
         let user = mv.user();
         user.clear_status();
-        let party = user.battle().unwrap().find_party_for_pokemon(&user);
+        let party = user.battle()?.unwrap().find_party_for_pokemon(&user)?;
         if let Some(party) = party {
             let p = party.party();
-            for index in 0..p.length() {
+            for mon in p.as_ref().into_iter().flatten() {
-                let mon = p.get_pokemon(index);
+                if !mon.equals(&user) {
-                if let Some(mon) = mon {
+                    mon.clear_status();
-                    if !mon.equals(&user) {
-                        mon.clear_status();
-                    }
                 }
             }
         }
+        Ok(())
     }
 
     fn as_any(&self) -> &dyn Any {

gen_7_scripts/src/moves/drain.rs

@@ -23,22 +23,24 @@ impl Script for Drain {
     fn on_initialize(
         &self,
         _library: DynamicLibrary,
-        parameters: Option<ImmutableList<Rc<EffectParameter>>>,
+        parameters: Option<Vec<Rc<EffectParameter>>>,
-    ) {
+    ) -> PkmnResult<()> {
         self.heal_modifier.store(
             parameters.unwrap().get(0).unwrap().as_float(),
             Ordering::SeqCst,
         );
+        Ok(())
     }
 
-    fn on_secondary_effect(&self, mv: ExecutingMove, target: Pokemon, hit: u8) {
+    fn on_secondary_effect(&self, mv: ExecutingMove, target: Pokemon, hit: u8) -> PkmnResult<()> {
-        let hit_data = mv.get_hit_data(&target, hit);
+        let hit_data = mv.get_hit_data(&target, hit)?;
-        let damage = hit_data.damage();
+        let damage = hit_data.damage()?;
         let mut modifier = self.heal_modifier.load(Ordering::SeqCst);
-        if mv.user().has_held_item("big_root") {
+        if mv.user().has_held_item("big_root")? {
             modifier *= 1.3;
         }
-        mv.user().heal((damage as f32 * modifier) as u32, false);
+        mv.user().heal((damage as f32 * modifier) as u32, false)?;
+        Ok(())
     }
 
     fn as_any(&self) -> &dyn Any {

gen_7_scripts/src/moves/flinch.rs

@@ -15,8 +15,14 @@ impl Script for Flinch {
         &[ScriptCapabilities::OnSecondaryEffect]
     }
 
-    fn on_secondary_effect(&self, _move: ExecutingMove, target: Pokemon, _hit: u8) {
+    fn on_secondary_effect(
-        target.add_volatile(Box::new(FlinchEffect::new()));
+        &self,
+        _move: ExecutingMove,
+        target: Pokemon,
+        _hit: u8,
+    ) -> PkmnResult<()> {
+        target.add_volatile(Box::new(FlinchEffect::new()))?;
+        Ok(())
     }
 
     fn as_any(&self) -> &dyn Any {
@@ -39,9 +45,10 @@ impl Script for FlinchEffect {
         &[ScriptCapabilities::PreventMove]
     }
 
-    fn prevent_move(&self, mv: ExecutingMove, prevent: &mut bool) {
+    fn prevent_move(&self, mv: ExecutingMove, prevent: &mut bool) -> PkmnResult<()> {
         *prevent = true;
-        mv.user().remove_volatile(self);
+        mv.user().remove_volatile(self)?;
+        Ok(())
     }
 
     fn as_any(&self) -> &dyn Any {

gen_7_scripts/src/moves/heal_each_end_of_turn.rs

@@ -28,16 +28,17 @@ impl Script for HealEachEndOfTurn {
     fn on_initialize(
         &self,
         _library: DynamicLibrary,
-        parameters: Option<ImmutableList<Rc<EffectParameter>>>,
+        parameters: Option<Vec<Rc<EffectParameter>>>,
-    ) {
+    ) -> PkmnResult<()> {
         self.heal_percent.store(
             parameters.unwrap().get(0).unwrap().as_float() / 100.0,
             Ordering::SeqCst,
         );
+        Ok(())
     }
 
-    fn on_secondary_effect(&self, _mv: ExecutingMove, target: Pokemon, _hit: u8) {
+    fn on_secondary_effect(&self, _mv: ExecutingMove, target: Pokemon, _hit: u8) -> PkmnResult<()> {
-        let script = target.add_volatile_by_name("heal_each_end_of_turn_effect");
+        let script = target.add_volatile_by_name("heal_each_end_of_turn_effect")?;
         let amount = self.heal_percent.load(Ordering::SeqCst);
         script
             .as_any()
@@ -45,6 +46,7 @@ impl Script for HealEachEndOfTurn {
             .unwrap()
             .heal_percent
             .store(amount, Ordering::SeqCst);
+        Ok(())
     }
 
     fn as_any(&self) -> &dyn Any {

gen_7_scripts/src/moves/multi_hit_move.rs

@@ -21,17 +21,23 @@ impl Script for MultiHitMove {
         &[ScriptCapabilities::ChangeNumberOfHits]
     }
 
-    fn change_number_of_hits(&self, choice: TurnChoice, number_of_hits: &mut u8) {
+    fn change_number_of_hits(&self, choice: TurnChoice, number_of_hits: &mut u8) -> PkmnResult<()> {
         // 35% chance that it will hit 2 times, a 35% chance it will hit 3 times, a 15% chance it
         // will hit 4 times, and a 15% chance it will hit 5 times.
-        let rand_value = choice.user().battle().unwrap().random().get_between(0, 100);
+        let rand_value = choice
+            .user()
+            .battle()?
+            .unwrap()
+            .random()
+            .get_between(0, 100)?;
         *number_of_hits = match rand_value {
             0..=34 => 2,
             35..=69 => 3,
             70..=84 => 4,
             85..=100 => 5,
             _ => *number_of_hits,
-        }
+        };
+        Ok(())
     }
 
     fn as_any(&self) -> &dyn Any {

gen_7_scripts/src/moves/struggle.rs

@@ -20,12 +20,23 @@ impl Script for Struggle {
         ]
     }
 
-    fn change_number_of_hits(&self, _choice: TurnChoice, number_of_hits: &mut u8) {
+    fn change_number_of_hits(
-        *number_of_hits = 1
+        &self,
+        _choice: TurnChoice,
+        number_of_hits: &mut u8,
+    ) -> PkmnResult<()> {
+        *number_of_hits = 1;
+        Ok(())
     }
 
-    fn is_invulnerable(&self, _move: ExecutingMove, _target: Pokemon, invulnerable: &mut bool) {
+    fn is_invulnerable(
+        &self,
+        _move: ExecutingMove,
+        _target: Pokemon,
+        invulnerable: &mut bool,
+    ) -> PkmnResult<()> {
         *invulnerable = false;
+        Ok(())
     }
 
     fn change_effectiveness(
@@ -34,16 +45,18 @@ impl Script for Struggle {
         _target: Pokemon,
         _hit: u8,
         effectiveness: &mut f32,
-    ) {
+    ) -> PkmnResult<()> {
         *effectiveness = 1.0;
+        Ok(())
     }
 
-    fn on_secondary_effect(&self, mv: ExecutingMove, _target: Pokemon, _hit: u8) {
+    fn on_secondary_effect(&self, mv: ExecutingMove, _target: Pokemon, _hit: u8) -> PkmnResult<()> {
-        let mut damage = mv.user().max_health() / 4;
+        let mut damage = mv.user().max_health()? / 4;
         if damage == 0 {
             damage = 1
         }
-        mv.user().damage(damage, DamageSource::Struggle);
+        mv.user().damage(damage, DamageSource::Struggle)?;
+        Ok(())
     }
 
     fn as_any(&self) -> &dyn Any {

gen_7_scripts/src/pokemon/heal_each_end_of_turn.rs

@@ -21,15 +21,16 @@ impl Script for HealEachEndOfTurnEffect {
         &[ScriptCapabilities::OnEndTurn]
     }
 
-    fn on_end_turn(&self) {
+    fn on_end_turn(&self) -> PkmnResult<()> {
         if let Some(ScriptOwner::Pokemon(pokemon)) = self.get_owner() {
             let mut amount =
-                pokemon.max_health() as f32 * self.heal_percent.load(Ordering::Relaxed);
+                pokemon.max_health()? as f32 * self.heal_percent.load(Ordering::Relaxed);
-            if pokemon.has_held_item("big_root") {
+            if pokemon.has_held_item("big_root")? {
                 amount *= 1.3;
             }
-            pokemon.heal(amount as u32, false);
+            pokemon.heal(amount as u32, false)?;
         }
+        Ok(())
     }
 
     fn as_any(&self) -> &dyn Any {

gen_7_scripts/src/pokemon/infatuated.rs

@@ -15,10 +15,11 @@ impl Script for Infatuated {
         &[ScriptCapabilities::PreventMove]
     }
 
-    fn prevent_move(&self, mv: ExecutingMove, prevent: &mut bool) {
+    fn prevent_move(&self, mv: ExecutingMove, prevent: &mut bool) -> PkmnResult<()> {
-        if mv.user().battle().unwrap().random().get_max(2) == 0 {
+        if mv.user().battle()?.unwrap().random().get_max(2)? == 0 {
             *prevent = true
         }
+        Ok(())
     }
 
     fn as_any(&self) -> &dyn Any {

gen_7_scripts/src/registered_scripts.rs

@@ -4,6 +4,7 @@ use crate::pokemon::*;
 use alloc::boxed::Box;
 use pkmn_lib_interface::app_interface::{get_hash, StringKey};
 use pkmn_lib_interface::handling::{Script, ScriptCategory};
+use pkmn_lib_interface::println;
 
 macro_rules! resolve_match {
     (
@@ -24,10 +25,11 @@ macro_rules! resolve_match {
 }
 
 pub fn get_script(category: ScriptCategory, name: &StringKey) -> Option<Box<dyn Script>> {
+    println!("Getting script {:?}", name);
     match category {
         ScriptCategory::Move => {
             resolve_match! {
-                name.hash(),
+                name.hash().unwrap(),
                 acrobatics::Acrobatics,
                 acupressure::Acupressure,
                 after_you::AfterYou,
@@ -54,13 +56,13 @@ pub fn get_script(category: ScriptCategory, name: &StringKey) -> Option<Box<dyn
         ScriptCategory::Status => {}
         ScriptCategory::Pokemon => {
             resolve_match! {
-                name.hash(),
+                name.hash().unwrap(),
                 infatuated::Infatuated,
                 pokemon::heal_each_end_of_turn::HealEachEndOfTurnEffect,
             }
         }
         ScriptCategory::Battle => {
-            resolve_match! {name.hash(), crate::util_scripts::ForceEffectTriggerScript,}
+            resolve_match! {name.hash().unwrap(), crate::util_scripts::ForceEffectTriggerScript,}
         }
         ScriptCategory::Side => {}
         ScriptCategory::ItemBattleTrigger => {}

gen_7_scripts/src/util_scripts/force_effect_trigger.rs

@@ -27,9 +27,10 @@ impl Script for ForceEffectTriggerScript {
         _target: Pokemon,
         _hit: u8,
         chance: &mut f32,
-    ) {
+    ) -> PkmnResult<()> {
         // Set to 50_000% chance.
         *chance = 50_000.0;
+        Ok(())
     }
 
     fn as_any(&self) -> &dyn Any {

gen_7_scripts/src/utils/copyable_moves.rs

@@ -5,7 +5,7 @@ macro_rules! non_copyable {
         $mv:ident,
         $($move_name:literal),+
     ) => {
-        match $mv.name().hash() {
+        match $mv.name().hash().unwrap() {
             0
             $(
                 | const { get_hash($move_name) }

pkmn_lib_interface/Cargo.toml

@@ -8,12 +8,11 @@ edition = "2021"
 mock_data = ["mockall"]
 
 [dependencies]
-cstr_core = { version = "0.2.6", features = ["nightly"]}
+cstr_core = { version = "0.2.6", features = ["nightly"] }
 enumflags2 = { version = "0.7.5", default-features = false }
 spin = { version = "0.9.4", default-features = false, features = ["rwlock"] }
 paste = { version = "1.0.7" }
-hashbrown = { version = "0.12.3" }
+hashbrown = { version = "0.13.2" }
 dlmalloc = { version = "0.2.4", features = ["global"] }
 mockall = { version = "0.11.2", optional = true, features = ["nightly"] }
-
+num-traits = { version = "0.2", default-features = false }
-

pkmn_lib_interface/src/app_interface/dynamic_data/battle.rs

@@ -1,28 +1,28 @@
 use alloc::rc::Rc;
 
-use crate::app_interface::list::ImmutableList;
 use crate::app_interface::{
     BattleParty, BattleRandom, BattleSide, ChoiceQueue, DynamicLibrary, Pokemon, StringKey,
 };
+use alloc::vec::Vec;
 
 #[cfg_attr(feature = "mock_data", mockall::automock)]
 pub trait BattleTrait {
     fn library(&self) -> DynamicLibrary;
-    fn parties(&self) -> ImmutableList<BattleParty>;
+    fn parties(&self) -> Vec<BattleParty>;
-    fn sides(&self) -> ImmutableList<BattleSide>;
+    fn sides(&self) -> Vec<BattleSide>;
     fn random(&self) -> BattleRandom;
     fn choice_queue(&self) -> ChoiceQueue;
-    fn get_pokemon(&self, side: u8, index: u8) -> Option<Pokemon>;
+    fn get_pokemon(&self, side: u8, index: u8) -> PkmnResult<Option<Pokemon>>;
-    fn find_party_for_pokemon(&self, pokemon: &Pokemon) -> Option<BattleParty>;
+    fn find_party_for_pokemon(&self, pokemon: &Pokemon) -> PkmnResult<Option<BattleParty>>;
-    fn weather_name(&self) -> Option<StringKey>;
+    fn weather_name(&self) -> PkmnResult<Option<StringKey>>;
-    fn has_weather(&self, name: &str) -> bool;
+    fn has_weather(&self, name: &str) -> PkmnResult<bool>;
-    fn can_flee(&self) -> bool;
+    fn can_flee(&self) -> PkmnResult<bool>;
-    fn number_of_sides(&self) -> u8;
+    fn number_of_sides(&self) -> PkmnResult<u8>;
-    fn pokemon_per_side(&self) -> u8;
+    fn pokemon_per_side(&self) -> PkmnResult<u8>;
-    fn has_ended(&self) -> bool;
+    fn has_ended(&self) -> PkmnResult<bool>;
-    fn has_ended_conclusively(&self) -> bool;
+    fn has_ended_conclusively(&self) -> PkmnResult<bool>;
-    fn winning_side(&self) -> u8;
+    fn winning_side(&self) -> PkmnResult<u8>;
-    fn current_turn(&self) -> u32;
+    fn current_turn(&self) -> PkmnResult<u32>;
 }
 
 pub type Battle = Rc<dyn BattleTrait>;
@@ -33,26 +33,26 @@ pub type MockBattle = MockBattleTrait;
 mod implementation {
     use super::*;
     use crate::app_interface::dynamic_data::dynamic_library::DynamicLibraryImpl;
-    use crate::app_interface::list::{
-        BattlePartyImmutableList, BattleSideImmutableList, ImmutableListWasm,
-    };
     use crate::app_interface::PokemonImpl;
     use crate::app_interface::{
         BattleParty, BattlePartyImpl, BattleRandom, BattleRandomImpl, BattleSide, BattleSideImpl,
         ChoiceQueue, ChoiceQueueImpl, Pokemon,
     };
     use crate::handling::cached_value::CachedValue;
+    use crate::handling::ffi_array::FFIArray;
+    use crate::handling::wasm_result::WasmResult;
     use crate::handling::Cacheable;
     use crate::{
         cached_value, cached_value_getters, wasm_value_getters_extern, wasm_value_getters_funcs,
-        ExternRef, ExternalReferenceType, StringKey, VecExternRef,
+        ExternRef, ExternalReferenceType, PkmnResult, StringKey,
     };
+    use alloc::vec::Vec;
 
     struct BattleInner {
         reference: ExternRef<BattleImpl>,
         library: CachedValue<DynamicLibrary>,
-        parties: CachedValue<ImmutableList<BattleParty>>,
+        parties: CachedValue<Vec<BattleParty>>,
-        sides: CachedValue<ImmutableList<BattleSide>>,
+        sides: CachedValue<Vec<BattleSide>>,
         random: CachedValue<Rc<BattleRandomImpl>>,
         choice_queue: CachedValue<Rc<ChoiceQueueImpl>>,
     }
@@ -69,21 +69,39 @@ mod implementation {
                 inner: Rc::new(BattleInner {
                     reference,
                     library: cached_value!({
-                        Rc::new(battle_get_library(reference).get_value().unwrap())
+                        Rc::new(battle_get_library(reference).unwrap().get_value().unwrap())
                     }),
                     parties: cached_value!({
-                        let reference = battle_get_parties(reference);
+                        let parties: FFIArray<ExternRef<BattlePartyImpl>> =
-                        Rc::new(BattlePartyImmutableList::from_ref(reference))
+                            FFIArray::from_u64(battle_get_parties(reference).unwrap());
+                        let parties =
+                            Vec::from_raw_parts(parties.ptr(), parties.len(), parties.len());
+                        let parties = parties
+                            .into_iter()
+                            .map::<BattleParty, _>(|r| Rc::new(BattlePartyImpl::new(r)))
+                            .collect::<Vec<_>>();
+                        parties
                     }),
                     sides: cached_value!({
-                        let reference = battle_get_sides(reference);
+                        let sides: FFIArray<ExternRef<BattleSideImpl>> =
-                        Rc::new(BattleSideImmutableList::from_ref(reference))
+                            FFIArray::from_u64(battle_get_sides(reference).unwrap());
+                        let sides = Vec::from_raw_parts(sides.ptr(), sides.len(), sides.len());
+                        let sides = sides
+                            .into_iter()
+                            .map::<BattleSide, _>(|r| Rc::new(BattleSideImpl::new(r)))
+                            .collect::<Vec<_>>();
+                        sides
                     }),
                     random: cached_value!({
-                        Rc::new(battle_get_random(reference).get_value().unwrap())
+                        Rc::new(battle_get_random(reference).unwrap().get_value().unwrap())
                     }),
                     choice_queue: cached_value!({
-                        Rc::new(battle_get_choice_queue(reference).get_value().unwrap())
+                        Rc::new(
+                            battle_get_choice_queue(reference)
+                                .unwrap()
+                                .get_value()
+                                .unwrap(),
+                        )
                     }),
                 }),
             })
@@ -94,46 +112,53 @@ mod implementation {
     impl BattleTrait for BattleImpl {
         cached_value_getters! {
             fn library(&self) -> DynamicLibrary;
-            fn parties(&self) -> ImmutableList<BattleParty>;
+            fn parties(&self) -> Vec<BattleParty>;
-            fn sides(&self) -> ImmutableList<BattleSide>;
+            fn sides(&self) -> Vec<BattleSide>;
             fn random(&self) -> BattleRandom;
             fn choice_queue(&self) -> ChoiceQueue;
         }
 
-        fn get_pokemon(&self, side: u8, index: u8) -> Option<Pokemon> {
+        fn get_pokemon(&self, side: u8, index: u8) -> PkmnResult<Option<Pokemon>> {
             unsafe {
-                let v = battle_get_pokemon(self.inner.reference, side, index).get_value();
+                let v = battle_get_pokemon(self.inner.reference, side, index)
+                    .as_res()?
+                    .get_value();
                 if let Some(v) = v {
-                    Some(Rc::new(v))
+                    Ok(Some(Rc::new(v)))
                 } else {
-                    None
+                    Ok(None)
                 }
             }
         }
 
-        fn find_party_for_pokemon(&self, pokemon: &Pokemon) -> Option<BattleParty> {
+        fn find_party_for_pokemon(&self, pokemon: &Pokemon) -> PkmnResult<Option<BattleParty>> {
             unsafe {
                 let b =
                     battle_find_party_for_pokemon(self.inner.reference, pokemon.reference().into())
+                        .as_res()?
                         .get_value();
-                if let Some(b) = b {
+                Ok(if let Some(b) = b {
                     Some(Rc::new(b))
                 } else {
                     None
-                }
+                })
             }
         }
 
-        fn weather_name(&self) -> Option<StringKey> {
+        fn weather_name(&self) -> PkmnResult<Option<StringKey>> {
-            unsafe { battle_get_weather_name(self.inner.reference).get_value() }
+            unsafe {
+                Ok(battle_get_weather_name(self.inner.reference)
+                    .as_res()?
+                    .get_value())
+            }
         }
-        fn has_weather(&self, name: &str) -> bool {
+        fn has_weather(&self, name: &str) -> PkmnResult<bool> {
-            if let Some(weather) = self.weather_name() {
+            if let Some(weather) = self.weather_name()? {
                 if weather.equals_str(name) {
-                    return true;
+                    return Ok(true);
                 }
             }
-            false
+            Ok(false)
         }
 
         wasm_value_getters_funcs! {
@@ -170,24 +195,29 @@ mod implementation {
 
     #[cfg(not(feature = "mock_data"))]
     extern "wasm" {
-        fn battle_get_library(r: ExternRef<BattleImpl>) -> ExternRef<DynamicLibraryImpl>;
+        fn battle_get_library(
-        fn battle_get_parties(r: ExternRef<BattleImpl>) -> VecExternRef<BattlePartyImpl>;
+            r: ExternRef<BattleImpl>,
-        fn battle_get_sides(r: ExternRef<BattleImpl>) -> VecExternRef<BattleSideImpl>;
+        ) -> WasmResult<ExternRef<DynamicLibraryImpl>>;
-        fn battle_get_random(r: ExternRef<BattleImpl>) -> ExternRef<BattleRandomImpl>;
+        fn battle_get_parties(r: ExternRef<BattleImpl>) -> WasmResult<u64>;
-        fn battle_get_choice_queue(r: ExternRef<BattleImpl>) -> ExternRef<ChoiceQueueImpl>;
+        fn battle_get_sides(r: ExternRef<BattleImpl>) -> WasmResult<u64>;
+        fn battle_get_random(r: ExternRef<BattleImpl>) -> WasmResult<ExternRef<BattleRandomImpl>>;
+        fn battle_get_choice_queue(
+            r: ExternRef<BattleImpl>,
+        ) -> WasmResult<ExternRef<ChoiceQueueImpl>>;
         fn battle_get_pokemon(
             r: ExternRef<BattleImpl>,
             side: u8,
             index: u8,
-        ) -> ExternRef<PokemonImpl>;
+        ) -> WasmResult<ExternRef<PokemonImpl>>;
         fn battle_find_party_for_pokemon(
             r: ExternRef<BattleImpl>,
             mon: ExternRef<PokemonImpl>,
-        ) -> ExternRef<BattlePartyImpl>;
+        ) -> WasmResult<ExternRef<BattlePartyImpl>>;
 
-        fn battle_get_weather_name(r: ExternRef<BattleImpl>) -> ExternRef<StringKey>;
+        fn battle_get_weather_name(r: ExternRef<BattleImpl>) -> WasmResult<ExternRef<StringKey>>;
     }
 }
 
+use crate::PkmnResult;
 #[cfg(not(feature = "mock_data"))]
 pub use implementation::*;

pkmn_lib_interface/src/app_interface/dynamic_data/battle_party.rs

@@ -15,6 +15,7 @@ mod implementation {
     use crate::app_interface::{BattlePartyTrait, Party, PartyImpl};
     use crate::handling::cached_value::CachedValue;
     use crate::handling::extern_ref::{ExternRef, ExternalReferenceType};
+    use crate::handling::wasm_result::WasmResult;
     use crate::handling::Cacheable;
     use crate::{cached_value, cached_value_getters};
     use alloc::rc::Rc;
@@ -35,7 +36,12 @@ mod implementation {
                 inner: Rc::new(BattlePartyInner {
                     reference,
                     party: cached_value!({
-                        Rc::new(battle_party_get_party(reference).get_value().unwrap())
+                        Rc::new(
+                            battle_party_get_party(reference)
+                                .unwrap()
+                                .get_value()
+                                .unwrap(),
+                        )
                     }),
                 }),
             })
@@ -59,7 +65,9 @@ mod implementation {
 
     #[cfg(not(feature = "mock_data"))]
     extern "wasm" {
-        fn battle_party_get_party(r: ExternRef<BattlePartyImpl>) -> ExternRef<PartyImpl>;
+        fn battle_party_get_party(
+            r: ExternRef<BattlePartyImpl>,
+        ) -> WasmResult<ExternRef<PartyImpl>>;
     }
 }
 

pkmn_lib_interface/src/app_interface/dynamic_data/battle_random.rs

@@ -1,10 +1,11 @@
+use crate::PkmnResult;
 use alloc::rc::Rc;
 
 #[cfg_attr(feature = "mock_data", mockall::automock)]
 pub trait BattleRandomTrait {
-    fn get(&self) -> i32;
+    fn get(&self) -> PkmnResult<i32>;
-    fn get_max(&self, max: i32) -> i32;
+    fn get_max(&self, max: i32) -> PkmnResult<i32>;
-    fn get_between(&self, min: i32, max: i32) -> i32;
+    fn get_between(&self, min: i32, max: i32) -> PkmnResult<i32>;
 }
 
 pub type BattleRandom = Rc<dyn BattleRandomTrait>;
@@ -17,6 +18,7 @@ pub use implementation::*;
 #[cfg(not(feature = "mock_data"))]
 mod implementation {
     use super::*;
+    use crate::handling::wasm_result::WasmResult;
     use crate::{ExternRef, ExternalReferenceType};
 
     #[derive(Clone)]
@@ -26,16 +28,16 @@ mod implementation {
 
     impl BattleRandomTrait for BattleRandomImpl {
         #[cfg(not(feature = "mock_data"))]
-        fn get(&self) -> i32 {
+        fn get(&self) -> PkmnResult<i32> {
-            unsafe { battle_random_get(self.reference) }
+            unsafe { battle_random_get(self.reference).as_res() }
         }
         #[cfg(not(feature = "mock_data"))]
-        fn get_max(&self, max: i32) -> i32 {
+        fn get_max(&self, max: i32) -> PkmnResult<i32> {
-            unsafe { battle_random_get_max(self.reference, max) }
+            unsafe { battle_random_get_max(self.reference, max).as_res() }
         }
         #[cfg(not(feature = "mock_data"))]
-        fn get_between(&self, min: i32, max: i32) -> i32 {
+        fn get_between(&self, min: i32, max: i32) -> PkmnResult<i32> {
-            unsafe { battle_random_get_between(self.reference, min, max) }
+            unsafe { battle_random_get_between(self.reference, min, max).as_res() }
         }
         // TODO: effect_chance()
     }
@@ -48,9 +50,13 @@ mod implementation {
 
     #[cfg(not(feature = "mock_data"))]
     extern "wasm" {
-        fn battle_random_get(r: ExternRef<BattleRandomImpl>) -> i32;
+        fn battle_random_get(r: ExternRef<BattleRandomImpl>) -> WasmResult<i32>;
-        fn battle_random_get_max(r: ExternRef<BattleRandomImpl>, max: i32) -> i32;
+        fn battle_random_get_max(r: ExternRef<BattleRandomImpl>, max: i32) -> WasmResult<i32>;
-        fn battle_random_get_between(r: ExternRef<BattleRandomImpl>, min: i32, max: i32) -> i32;
+        fn battle_random_get_between(
+            r: ExternRef<BattleRandomImpl>,
+            min: i32,
+            max: i32,
+        ) -> WasmResult<i32>;
 
     }
 }

pkmn_lib_interface/src/app_interface/dynamic_data/battle_side.rs

@@ -6,8 +6,8 @@ pub trait BattleSideTrait: WithVolatile {
     fn pokemon_per_side(&self) -> u8;
     fn battle(&self) -> Battle;
     fn get_pokemon(&self, index: usize) -> Option<Pokemon>;
-    fn has_fled_battle(&self) -> bool;
+    fn has_fled_battle(&self) -> PkmnResult<bool>;
-    fn is_defeated(&self) -> bool;
+    fn is_defeated(&self) -> PkmnResult<bool>;
 }
 
 pub type BattleSide = Rc<dyn BattleSideTrait>;
@@ -18,10 +18,11 @@ mod implementation {
     use crate::app_interface::{BattleImpl, PokemonImpl};
     use crate::handling::cached_value::CachedValue;
     use crate::handling::extern_ref::{ExternRef, ExternalReferenceType};
+    use crate::handling::wasm_result::{WasmResult, WasmVoidResult};
     use crate::handling::{Cacheable, Script};
     use crate::{
         cached_value, cached_value_getters, wasm_value_getters_extern, wasm_value_getters_funcs,
-        ScriptPtr,
+        PkmnResult, ScriptPtr,
     };
     use alloc::boxed::Box;
     use cstr_core::{c_char, CString};
@@ -43,10 +44,17 @@ mod implementation {
             Self::from_ref(reference, &|reference| Self {
                 inner: Rc::new(BattleSideInner {
                     reference,
-                    side_index: cached_value!({ battleside_get_side_index(reference) }),
+                    side_index: cached_value!({ battleside_get_side_index(reference).unwrap() }),
-                    pokemon_per_side: cached_value!({ battleside_get_pokemon_per_side(reference) }),
+                    pokemon_per_side: cached_value!({
+                        battleside_get_pokemon_per_side(reference).unwrap()
+                    }),
                     battle: cached_value!({
-                        Rc::new(battleside_get_battle(reference).get_value().unwrap())
+                        Rc::new(
+                            battleside_get_battle(reference)
+                                .unwrap()
+                                .get_value()
+                                .unwrap(),
+                        )
                     }),
                 }),
             })
@@ -62,7 +70,9 @@ mod implementation {
 
         fn get_pokemon(&self, index: usize) -> Option<Pokemon> {
             unsafe {
-                let p = battleside_get_pokemon(self.inner.reference, index).get_value();
+                let p = battleside_get_pokemon(self.inner.reference, index)
+                    .unwrap()
+                    .get_value();
                 if let Some(p) = p {
                     Some(Rc::new(p))
                 } else {
@@ -79,39 +89,51 @@ mod implementation {
     }
 
     impl WithVolatile for BattleSideImpl {
-        fn has_volatile(&self, script_name: &str) -> bool {
+        fn has_volatile(&self, script_name: &str) -> PkmnResult<bool> {
             unsafe {
                 let script_name = CString::new(script_name).unwrap();
-                battleside_has_volatile(self.inner.reference, script_name.as_ptr())
+                battleside_has_volatile(self.inner.reference, script_name.as_ptr()).as_res()
             }
         }
-        fn add_volatile(&self, script: Box<dyn Script>) -> &dyn Script {
+        fn add_volatile(&self, script: Box<dyn Script>) -> PkmnResult<&dyn Script> {
             unsafe {
-                battleside_add_volatile(self.inner.reference, ScriptPtr::new(script))
+                Ok(
-                    .val()
+                    battleside_add_volatile(self.inner.reference, ScriptPtr::new(script))
-                    .unwrap()
+                        .as_res()?
+                        .val()
+                        .unwrap(),
+                )
             }
         }
 
-        fn add_volatile_by_name(&self, script_name: &str) -> &dyn Script {
+        fn add_volatile_by_name(&self, script_name: &str) -> PkmnResult<&dyn Script> {
             unsafe {
                 let ptr = CString::new(script_name).unwrap();
-                battleside_add_volatile_by_name(self.inner.reference, ptr.as_ptr())
+                Ok(
-                    .val()
+                    battleside_add_volatile_by_name(self.inner.reference, ptr.as_ptr())
-                    .unwrap()
+                        .as_res()?
+                        .val()
+                        .unwrap(),
+                )
             }
         }
 
-        fn remove_volatile(&self, script: &dyn Script) {
+        fn remove_volatile(&self, script: &dyn Script) -> PkmnResult<()> {
             unsafe {
                 let name = CString::new(script.get_name()).unwrap();
-                battleside_remove_volatile(self.inner.reference, name.as_ptr());
+                battleside_remove_volatile(self.inner.reference, name.as_ptr()).as_res()
             }
         }
 
-        fn get_volatile_script(&self, script_name: &str) -> Option<&dyn Script> {
+        fn get_volatile_script(&self, script_name: &str) -> PkmnResult<Option<&dyn Script>> {
             let script_name = CString::new(script_name).unwrap();
-            unsafe { battleside_get_volatile(self.inner.reference, script_name.as_ptr()).val() }
+            unsafe {
+                Ok(
+                    battleside_get_volatile(self.inner.reference, script_name.as_ptr())
+                        .as_res()?
+                        .val(),
+                )
+            }
         }
     }
 
@@ -130,24 +152,38 @@ mod implementation {
     }
 
     extern "wasm" {
-        fn battleside_get_side_index(r: ExternRef<BattleSideImpl>) -> u8;
+        fn battleside_get_side_index(r: ExternRef<BattleSideImpl>) -> WasmResult<u8>;
-        fn battleside_get_pokemon_per_side(r: ExternRef<BattleSideImpl>) -> u8;
+        fn battleside_get_pokemon_per_side(r: ExternRef<BattleSideImpl>) -> WasmResult<u8>;
-        fn battleside_get_battle(r: ExternRef<BattleSideImpl>) -> ExternRef<BattleImpl>;
+        fn battleside_get_battle(r: ExternRef<BattleSideImpl>)
+            -> WasmResult<ExternRef<BattleImpl>>;
         fn battleside_get_pokemon(
             r: ExternRef<BattleSideImpl>,
             index: usize,
-        ) -> ExternRef<PokemonImpl>;
+        ) -> WasmResult<ExternRef<PokemonImpl>>;
 
         fn battleside_add_volatile_by_name(
             r: ExternRef<BattleSideImpl>,
             name: *const c_char,
-        ) -> ScriptPtr;
+        ) -> WasmResult<ScriptPtr>;
-        fn battleside_add_volatile(r: ExternRef<BattleSideImpl>, script: ScriptPtr) -> ScriptPtr;
+        fn battleside_add_volatile(
-        fn battleside_has_volatile(r: ExternRef<BattleSideImpl>, name: *const c_char) -> bool;
+            r: ExternRef<BattleSideImpl>,
-        fn battleside_remove_volatile(r: ExternRef<BattleSideImpl>, name: *const c_char);
+            script: ScriptPtr,
-        fn battleside_get_volatile(r: ExternRef<BattleSideImpl>, name: *const c_char) -> ScriptPtr;
+        ) -> WasmResult<ScriptPtr>;
+        fn battleside_has_volatile(
+            r: ExternRef<BattleSideImpl>,
+            name: *const c_char,
+        ) -> WasmResult<bool>;
+        fn battleside_remove_volatile(
+            r: ExternRef<BattleSideImpl>,
+            name: *const c_char,
+        ) -> WasmVoidResult;
+        fn battleside_get_volatile(
+            r: ExternRef<BattleSideImpl>,
+            name: *const c_char,
+        ) -> WasmResult<ScriptPtr>;
     }
 }
 
+use crate::PkmnResult;
 #[cfg(not(feature = "mock_data"))]
 pub use implementation::*;

pkmn_lib_interface/src/app_interface/dynamic_data/choice_queue.rs

@@ -3,7 +3,7 @@ use alloc::rc::Rc;
 
 #[cfg_attr(feature = "mock_data", mockall::automock)]
 pub trait ChoiceQueueTrait {
-    fn move_pokemon_choice_next(&self, pokemon: &Pokemon) -> bool;
+    fn move_pokemon_choice_next(&self, pokemon: &Pokemon) -> PkmnResult<bool>;
 }
 
 pub type ChoiceQueue = Rc<dyn ChoiceQueueTrait>;
@@ -14,7 +14,8 @@ pub type MockChoiceQueue = MockChoiceQueueTrait;
 mod implementation {
     use super::*;
     use crate::app_interface::PokemonImpl;
-    use crate::{ExternRef, ExternalReferenceType};
+    use crate::handling::wasm_result::WasmResult;
+    use crate::{ExternRef, ExternalReferenceType, PkmnResult};
 
     #[derive(Clone)]
     pub struct ChoiceQueueImpl {
@@ -28,9 +29,10 @@ mod implementation {
     }
 
     impl ChoiceQueueTrait for ChoiceQueueImpl {
-        fn move_pokemon_choice_next(&self, pokemon: &Pokemon) -> bool {
+        fn move_pokemon_choice_next(&self, pokemon: &Pokemon) -> PkmnResult<bool> {
             unsafe {
                 choice_queue_move_pokemon_choice_next(self.reference, pokemon.reference().into())
+                    .as_res()
             }
         }
     }
@@ -45,9 +47,10 @@ mod implementation {
         fn choice_queue_move_pokemon_choice_next(
             r: ExternRef<ChoiceQueueImpl>,
             pokemon: ExternRef<PokemonImpl>,
-        ) -> bool;
+        ) -> WasmResult<bool>;
     }
 }
 
+use crate::PkmnResult;
 #[cfg(not(feature = "mock_data"))]
 pub use implementation::*;

pkmn_lib_interface/src/app_interface/dynamic_data/dynamic_library.rs

@@ -15,6 +15,7 @@ mod implementation {
     use crate::cached_value;
     use crate::handling::cached_value::CachedValue;
     use crate::handling::extern_ref::{ExternRef, ExternalReferenceType};
+    use crate::handling::wasm_result::WasmResult;
     use crate::handling::Cacheable;
     use alloc::rc::Rc;
 
@@ -36,7 +37,12 @@ mod implementation {
                 inner: Rc::new(DynamicLibraryInner {
                     ptr,
                     static_data: cached_value!({
-                        Rc::new(dynamic_library_get_static_data(ptr).get_value().unwrap())
+                        Rc::new(
+                            dynamic_library_get_static_data(ptr)
+                                .unwrap()
+                                .get_value()
+                                .unwrap(),
+                        )
                     }),
                 }),
             })
@@ -58,7 +64,7 @@ mod implementation {
     extern "wasm" {
         fn dynamic_library_get_static_data(
             ptr: ExternRef<DynamicLibraryImpl>,
-        ) -> ExternRef<StaticDataImpl>;
+        ) -> WasmResult<ExternRef<StaticDataImpl>>;
     }
 }
 

pkmn_lib_interface/src/app_interface/dynamic_data/executing_move.rs

@@ -1,5 +1,6 @@
 use crate::app_interface::{LearnedMove, MoveData, Pokemon};
 use crate::handling::Script;
+use alloc::boxed::Box;
 use alloc::rc::Rc;
 
 #[cfg_attr(feature = "mock_data", mockall::automock)]
@@ -8,25 +9,25 @@ pub trait ExecutingMoveTrait {
     fn user(&self) -> Pokemon;
     fn chosen_move(&self) -> LearnedMove;
     fn use_move(&self) -> MoveData;
-    fn move_script<'a>(&'a self) -> Option<&'a dyn Script>;
+    fn move_script<'a>(&'a self) -> PkmnResult<Option<&'a Box<dyn Script>>>;
-    fn number_of_targets(&self) -> usize;
+    fn number_of_targets(&self) -> PkmnResult<usize>;
-    fn is_pokemon_target(&self, pokemon: &Pokemon) -> bool;
+    fn is_pokemon_target(&self, pokemon: &Pokemon) -> PkmnResult<bool>;
-    fn get_hit_data(&self, pokemon: &Pokemon, hit: u8) -> HitData;
+    fn get_hit_data(&self, pokemon: &Pokemon, hit: u8) -> PkmnResult<HitData>;
 }
 
 #[cfg_attr(feature = "mock_data", mockall::automock)]
 pub trait HitDataTrait {
-    fn is_critical(&self) -> bool;
+    fn is_critical(&self) -> PkmnResult<bool>;
-    fn base_power(&self) -> u8;
+    fn base_power(&self) -> PkmnResult<u8>;
-    fn effectiveness(&self) -> f32;
+    fn effectiveness(&self) -> PkmnResult<f32>;
-    fn damage(&self) -> u32;
+    fn damage(&self) -> PkmnResult<u32>;
-    fn move_type(&self) -> u8;
+    fn move_type(&self) -> PkmnResult<u8>;
-    fn has_failed(&self) -> bool;
+    fn has_failed(&self) -> PkmnResult<bool>;
-    fn set_critical(&self, critical: bool);
+    fn set_critical(&self, critical: bool) -> PkmnResult<()>;
-    fn set_effectiveness(&self, effectiveness: f32);
+    fn set_effectiveness(&self, effectiveness: f32) -> PkmnResult<()>;
-    fn set_damage(&self, damage: u32);
+    fn set_damage(&self, damage: u32) -> PkmnResult<()>;
-    fn set_move_type(&self, move_type: u8);
+    fn set_move_type(&self, move_type: u8) -> PkmnResult<()>;
-    fn fail(&self);
+    fn fail(&self) -> PkmnResult<()>;
 }
 
 pub type ExecutingMove = Rc<dyn ExecutingMoveTrait>;
@@ -37,6 +38,7 @@ pub type HitData = Rc<dyn HitDataTrait>;
 #[cfg(feature = "mock_data")]
 pub type MockHitData = MockHitDataTrait;
 
+use crate::PkmnResult;
 #[cfg(not(feature = "mock_data"))]
 pub use implementation::*;
 
@@ -44,10 +46,12 @@ pub use implementation::*;
 mod implementation {
     use super::*;
     use crate::app_interface::{LearnedMoveImpl, MoveDataImpl, PokemonImpl};
-    use crate::cached_value;
     use crate::handling::cached_value::CachedValue;
     use crate::handling::extern_ref::{ExternRef, ExternalReferenceType};
     use crate::handling::temporary::Temporary;
+    use crate::handling::wasm_result::WasmResult;
+    use crate::{cached_value, PkmnResult};
+    use alloc::boxed::Box;
 
     #[derive(Clone)]
     pub struct ExecutingMoveImpl {
@@ -71,20 +75,31 @@ mod implementation {
                     ExecutingMoveInner {
                         reference,
                         number_of_hits: cached_value!({
-                            executing_move_get_number_of_hits(reference)
+                            executing_move_get_number_of_hits(reference).unwrap()
                         }),
                         user: cached_value!({
-                            Rc::new(executing_move_get_user(reference).get_value().unwrap())
+                            Rc::new(
+                                executing_move_get_user(reference)
+                                    .unwrap()
+                                    .get_value()
+                                    .unwrap(),
+                            )
                         }),
                         chosen_move: cached_value!({
                             Rc::new(
                                 executing_move_get_chosen_move(reference)
+                                    .unwrap()
                                     .get_value()
                                     .unwrap(),
                             )
                         }),
                         use_move: cached_value!({
-                            Rc::new(executing_move_get_use_move(reference).get_value().unwrap())
+                            Rc::new(
+                                executing_move_get_use_move(reference)
+                                    .unwrap()
+                                    .get_value()
+                                    .unwrap(),
+                            )
                         }),
                     },
                 ),
@@ -106,31 +121,39 @@ mod implementation {
         fn use_move(&self) -> MoveData {
             self.inner.value().use_move.value()
         }
-        fn move_script(&self) -> Option<&dyn Script> {
+        fn move_script(&self) -> PkmnResult<Option<&Box<dyn Script>>> {
-            unsafe { executing_move_get_script(self.inner.value().reference).as_ref() }
+            unsafe {
+                Ok(
+                    (executing_move_get_script(self.inner.value().reference).as_res()?
+                        as *const Box<dyn Script>)
+                        .as_ref(),
+                )
+            }
         }
-        fn number_of_targets(&self) -> usize {
+        fn number_of_targets(&self) -> PkmnResult<usize> {
-            unsafe { executing_move_get_number_of_targets(self.inner.value().reference) }
+            unsafe { executing_move_get_number_of_targets(self.inner.value().reference).as_res() }
         }
-        fn is_pokemon_target(&self, pokemon: &Pokemon) -> bool {
+        fn is_pokemon_target(&self, pokemon: &Pokemon) -> PkmnResult<bool> {
             unsafe {
                 executing_move_is_pokemon_target(
                     self.inner.value().reference,
                     pokemon.reference().into(),
                 )
+                .as_res()
             }
         }
-        fn get_hit_data(&self, pokemon: &Pokemon, hit: u8) -> HitData {
+        fn get_hit_data(&self, pokemon: &Pokemon, hit: u8) -> PkmnResult<HitData> {
             unsafe {
-                Rc::new(
+                Ok(Rc::new(
                     executing_move_get_hit_data(
                         self.inner.value().reference,
                         pokemon.reference().into(),
                         hit,
                     )
+                    .as_res()?
                     .get_value()
                     .unwrap(),
-                )
+                ))
             }
         }
     }
@@ -142,39 +165,39 @@ mod implementation {
 
     #[cfg(not(feature = "mock_data"))]
     impl HitDataTrait for HitDataImpl {
-        fn is_critical(&self) -> bool {
+        fn is_critical(&self) -> PkmnResult<bool> {
-            unsafe { hit_data_is_critical(self.reference) }
+            unsafe { hit_data_is_critical(self.reference).as_res() }
         }
-        fn base_power(&self) -> u8 {
+        fn base_power(&self) -> PkmnResult<u8> {
-            unsafe { hit_data_get_base_power(self.reference) }
+            unsafe { hit_data_get_base_power(self.reference).as_res() }
         }
-        fn effectiveness(&self) -> f32 {
+        fn effectiveness(&self) -> PkmnResult<f32> {
-            unsafe { hit_data_get_effectiveness(self.reference) }
+            unsafe { hit_data_get_effectiveness(self.reference).as_res() }
         }
-        fn damage(&self) -> u32 {
+        fn damage(&self) -> PkmnResult<u32> {
-            unsafe { hit_data_get_damage(self.reference) }
+            unsafe { hit_data_get_damage(self.reference).as_res() }
         }
-        fn move_type(&self) -> u8 {
+        fn move_type(&self) -> PkmnResult<u8> {
-            unsafe { hit_data_get_move_type(self.reference) }
+            unsafe { hit_data_get_move_type(self.reference).as_res() }
         }
-        fn has_failed(&self) -> bool {
+        fn has_failed(&self) -> PkmnResult<bool> {
-            unsafe { hit_data_is_critical(self.reference) }
+            unsafe { hit_data_is_critical(self.reference).as_res() }
         }
 
-        fn set_critical(&self, critical: bool) {
+        fn set_critical(&self, critical: bool) -> PkmnResult<()> {
-            unsafe { hit_data_set_critical(self.reference, critical) }
+            unsafe { hit_data_set_critical(self.reference, critical).as_res() }
         }
-        fn set_effectiveness(&self, effectiveness: f32) {
+        fn set_effectiveness(&self, effectiveness: f32) -> PkmnResult<()> {
-            unsafe { hit_data_set_effectiveness(self.reference, effectiveness) }
+            unsafe { hit_data_set_effectiveness(self.reference, effectiveness).as_res() }
         }
-        fn set_damage(&self, damage: u32) {
+        fn set_damage(&self, damage: u32) -> PkmnResult<()> {
-            unsafe { hit_data_set_damage(self.reference, damage) }
+            unsafe { hit_data_set_damage(self.reference, damage).as_res() }
         }
-        fn set_move_type(&self, move_type: u8) {
+        fn set_move_type(&self, move_type: u8) -> PkmnResult<()> {
-            unsafe { hit_data_set_move_type(self.reference, move_type) }
+            unsafe { hit_data_set_move_type(self.reference, move_type).as_res() }
         }
-        fn fail(&self) {
+        fn fail(&self) -> PkmnResult<()> {
-            unsafe { hit_data_fail(self.reference) }
+            unsafe { hit_data_fail(self.reference).as_res() }
         }
     }
 
@@ -194,38 +217,47 @@ mod implementation {
 
     #[cfg(not(feature = "mock_data"))]
     extern "wasm" {
-        fn executing_move_get_number_of_targets(r: ExternRef<ExecutingMoveImpl>) -> usize;
+        fn executing_move_get_number_of_targets(
-        fn executing_move_get_number_of_hits(r: ExternRef<ExecutingMoveImpl>) -> u8;
+            r: ExternRef<ExecutingMoveImpl>,
-        fn executing_move_get_user(r: ExternRef<ExecutingMoveImpl>) -> ExternRef<PokemonImpl>;
+        ) -> WasmResult<usize>;
+        fn executing_move_get_number_of_hits(r: ExternRef<ExecutingMoveImpl>) -> WasmResult<u8>;
+        fn executing_move_get_user(
+            r: ExternRef<ExecutingMoveImpl>,
+        ) -> WasmResult<ExternRef<PokemonImpl>>;
         fn executing_move_get_chosen_move(
             r: ExternRef<ExecutingMoveImpl>,
-        ) -> ExternRef<LearnedMoveImpl>;
+        ) -> WasmResult<ExternRef<LearnedMoveImpl>>;
-        fn executing_move_get_use_move(r: ExternRef<ExecutingMoveImpl>) -> ExternRef<MoveDataImpl>;
+        fn executing_move_get_use_move(
+            r: ExternRef<ExecutingMoveImpl>,
+        ) -> WasmResult<ExternRef<MoveDataImpl>>;
         #[allow(improper_ctypes)]
-        fn executing_move_get_script(r: ExternRef<ExecutingMoveImpl>) -> *const dyn Script;
+        fn executing_move_get_script(r: ExternRef<ExecutingMoveImpl>) -> WasmResult<u32>;
 
         fn executing_move_is_pokemon_target(
             r: ExternRef<ExecutingMoveImpl>,
             pokemon: ExternRef<PokemonImpl>,
-        ) -> bool;
+        ) -> WasmResult<bool>;
         fn executing_move_get_hit_data(
             r: ExternRef<ExecutingMoveImpl>,
             target: ExternRef<PokemonImpl>,
             hit: u8,
-        ) -> ExternRef<HitDataImpl>;
+        ) -> WasmResult<ExternRef<HitDataImpl>>;
 
-        fn hit_data_is_critical(r: ExternRef<HitDataImpl>) -> bool;
+        fn hit_data_is_critical(r: ExternRef<HitDataImpl>) -> WasmResult<bool>;
-        fn hit_data_get_base_power(r: ExternRef<HitDataImpl>) -> u8;
+        fn hit_data_get_base_power(r: ExternRef<HitDataImpl>) -> WasmResult<u8>;
-        fn hit_data_get_effectiveness(r: ExternRef<HitDataImpl>) -> f32;
+        fn hit_data_get_effectiveness(r: ExternRef<HitDataImpl>) -> WasmResult<f32>;
-        fn hit_data_get_damage(r: ExternRef<HitDataImpl>) -> u32;
+        fn hit_data_get_damage(r: ExternRef<HitDataImpl>) -> WasmResult<u32>;
-        fn hit_data_get_move_type(r: ExternRef<HitDataImpl>) -> u8;
+        fn hit_data_get_move_type(r: ExternRef<HitDataImpl>) -> WasmResult<u8>;
-        fn hit_data_has_failed(r: ExternRef<HitDataImpl>) -> bool;
+        fn hit_data_has_failed(r: ExternRef<HitDataImpl>) -> WasmResult<bool>;
 
-        fn hit_data_set_critical(r: ExternRef<HitDataImpl>, critical: bool);
+        fn hit_data_set_critical(r: ExternRef<HitDataImpl>, critical: bool) -> WasmResult<()>;
-        fn hit_data_set_base_power(r: ExternRef<HitDataImpl>, power: u8);
+        fn hit_data_set_base_power(r: ExternRef<HitDataImpl>, power: u8) -> WasmResult<()>;
-        fn hit_data_set_effectiveness(r: ExternRef<HitDataImpl>, effectiveness: f32);
+        fn hit_data_set_effectiveness(
-        fn hit_data_set_damage(r: ExternRef<HitDataImpl>, damage: u32);
+            r: ExternRef<HitDataImpl>,
-        fn hit_data_set_move_type(r: ExternRef<HitDataImpl>, move_type: u8);
+            effectiveness: f32,
-        fn hit_data_fail(r: ExternRef<HitDataImpl>);
+        ) -> WasmResult<()>;
+        fn hit_data_set_damage(r: ExternRef<HitDataImpl>, damage: u32) -> WasmResult<()>;
+        fn hit_data_set_move_type(r: ExternRef<HitDataImpl>, move_type: u8) -> WasmResult<()>;
+        fn hit_data_fail(r: ExternRef<HitDataImpl>) -> WasmResult<()>;
     }
 }

pkmn_lib_interface/src/app_interface/dynamic_data/learned_move.rs

@@ -29,6 +29,7 @@ mod implementation {
     use crate::app_interface::MoveDataImpl;
     use crate::handling::cached_value::CachedValue;
     use crate::handling::extern_ref::{ExternRef, ExternalReferenceType};
+    use crate::handling::wasm_result::WasmResult;
     use crate::handling::Cacheable;
     use crate::{cached_value, cached_value_getters, wasm_value_getters};
     use alloc::rc::Rc;
@@ -58,9 +59,16 @@ mod implementation {
                 inner: Rc::new(LearnedMoveInner {
                     reference,
                     move_data: cached_value!({
-                        Rc::new(learned_move_get_move_data(reference).get_value().unwrap())
+                        Rc::new(
+                            learned_move_get_move_data(reference)
+                                .unwrap()
+                                .get_value()
+                                .unwrap(),
+                        )
+                    }),
+                    learn_method: cached_value!({
+                        learned_move_get_learn_method(reference).unwrap()
                     }),
-                    learn_method: cached_value!({ learned_move_get_learn_method(reference) }),
                 }),
             })
         }
@@ -92,10 +100,14 @@ mod implementation {
     }
 
     extern "wasm" {
-        fn learned_move_get_move_data(r: ExternRef<LearnedMoveImpl>) -> ExternRef<MoveDataImpl>;
+        fn learned_move_get_move_data(
-        fn learned_move_get_learn_method(r: ExternRef<LearnedMoveImpl>) -> MoveLearnMethod;
+            r: ExternRef<LearnedMoveImpl>,
-        fn learned_move_restore_uses(r: ExternRef<LearnedMoveImpl>, uses: u8);
+        ) -> WasmResult<ExternRef<MoveDataImpl>>;
-        fn learned_move_restore_all_uses(r: ExternRef<LearnedMoveImpl>);
+        fn learned_move_get_learn_method(
+            r: ExternRef<LearnedMoveImpl>,
+        ) -> WasmResult<MoveLearnMethod>;
+        fn learned_move_restore_uses(r: ExternRef<LearnedMoveImpl>, uses: u8) -> WasmResult<()>;
+        fn learned_move_restore_all_uses(r: ExternRef<LearnedMoveImpl>) -> WasmResult<()>;
     }
 }
 

pkmn_lib_interface/src/app_interface/dynamic_data/party.rs

@@ -5,8 +5,8 @@ use core::iter::IntoIterator;
 
 #[cfg_attr(feature = "mock_data", mockall::automock)]
 pub trait PartyTrait {
-    fn get_pokemon(&self, index: usize) -> Option<Pokemon>;
+    fn get_pokemon(&self, index: usize) -> PkmnResult<Option<Pokemon>>;
-    fn length(&self) -> usize;
+    fn length(&self) -> PkmnResult<usize>;
 }
 
 pub type Party = Rc<dyn PartyTrait>;
@@ -16,7 +16,10 @@ impl<'a> IntoIterator for &'a dyn PartyTrait {
     type IntoIter = ExternIterator<'a, Self::Item>;
 
     fn into_iter(self) -> Self::IntoIter {
-        ExternIterator::new(self.length(), Box::new(move |i| self.get_pokemon(i)))
+        ExternIterator::new(
+            self.length().unwrap(),
+            Box::new(move |i| self.get_pokemon(i).unwrap()),
+        )
     }
 }
 
@@ -28,6 +31,8 @@ mod implementation {
     use super::*;
     use crate::app_interface::PokemonImpl;
     use crate::handling::extern_ref::{ExternRef, ExternalReferenceType};
+    use crate::handling::wasm_result::WasmResult;
+    use crate::PkmnResult;
 
     #[derive(Clone)]
     pub struct PartyImpl {
@@ -41,19 +46,21 @@ mod implementation {
     }
 
     impl PartyTrait for PartyImpl {
-        fn get_pokemon(&self, index: usize) -> Option<Pokemon> {
+        fn get_pokemon(&self, index: usize) -> PkmnResult<Option<Pokemon>> {
             unsafe {
-                let v = party_get_pokemon(self.reference, index).get_value();
+                let v = party_get_pokemon(self.reference, index)
-                if let Some(v) = v {
+                    .as_res()?
+                    .get_value();
+                Ok(if let Some(v) = v {
                     Some(Rc::new(v))
                 } else {
                     None
-                }
+                })
             }
         }
 
-        fn length(&self) -> usize {
+        fn length(&self) -> PkmnResult<usize> {
-            unsafe { party_get_length(self.reference) }
+            unsafe { party_get_length(self.reference).as_res() }
         }
     }
 
@@ -64,11 +71,15 @@ mod implementation {
     }
 
     extern "wasm" {
-        fn party_get_pokemon(r: ExternRef<PartyImpl>, index: usize) -> ExternRef<PokemonImpl>;
+        fn party_get_pokemon(
-        fn party_get_length(r: ExternRef<PartyImpl>) -> usize;
+            r: ExternRef<PartyImpl>,
+            index: usize,
+        ) -> WasmResult<ExternRef<PokemonImpl>>;
+        fn party_get_length(r: ExternRef<PartyImpl>) -> WasmResult<usize>;
     }
 }
 
 use crate::utils::ExternIterator;
+use crate::PkmnResult;
 #[cfg(not(feature = "mock_data"))]
 pub use implementation::*;

pkmn_lib_interface/src/app_interface/dynamic_data/pokemon.rs

@@ -8,36 +8,37 @@ use alloc::boxed::Box;
 use alloc::rc::Rc;
 use cstr_core::c_char;
 
+use crate::PkmnResult;
 #[cfg(not(feature = "mock_data"))]
 pub use implementation::*;
 
 pub trait PokemonTrait: WithVolatile {
     fn reference(&self) -> u32;
 
-    fn species(&self) -> Species;
+    fn species(&self) -> PkmnResult<Species>;
-    fn form(&self) -> Form;
+    fn form(&self) -> PkmnResult<Form>;
-    fn active_ability(&self) -> Ability;
+    fn active_ability(&self) -> PkmnResult<Ability>;
-    fn nature(&self) -> Nature;
+    fn nature(&self) -> PkmnResult<Nature>;
-    fn display_species(&self) -> Species;
+    fn display_species(&self) -> PkmnResult<Species>;
-    fn display_form(&self) -> Form;
+    fn display_form(&self) -> PkmnResult<Form>;
-    fn held_item(&self) -> Option<Item>;
+    fn held_item(&self) -> PkmnResult<Option<Item>>;
-    fn battle(&self) -> Option<Battle>;
+    fn battle(&self) -> PkmnResult<Option<Battle>>;
-    fn level(&self) -> LevelInt;
+    fn level(&self) -> PkmnResult<LevelInt>;
-    fn experience(&self) -> u32;
+    fn experience(&self) -> PkmnResult<u32>;
-    fn unique_identifier(&self) -> u32;
+    fn unique_identifier(&self) -> PkmnResult<u32>;
-    fn gender(&self) -> Gender;
+    fn gender(&self) -> PkmnResult<Gender>;
-    fn coloring(&self) -> u8;
+    fn coloring(&self) -> PkmnResult<u8>;
-    fn current_health(&self) -> u32;
+    fn current_health(&self) -> PkmnResult<u32>;
-    fn weight(&self) -> f32;
+    fn weight(&self) -> PkmnResult<f32>;
-    fn height(&self) -> f32;
+    fn height(&self) -> PkmnResult<f32>;
-    fn nickname(&self) -> *const c_char;
+    fn nickname(&self) -> PkmnResult<*const c_char>;
-    fn real_ability(&self) -> AbilityIndex;
+    fn real_ability(&self) -> PkmnResult<AbilityIndex>;
-    fn types_length(&self) -> usize;
+    fn types_length(&self) -> PkmnResult<usize>;
-    fn battle_side_index(&self) -> u8;
+    fn battle_side_index(&self) -> PkmnResult<u8>;
-    fn battle_index(&self) -> u8;
+    fn battle_index(&self) -> PkmnResult<u8>;
-    fn is_ability_overriden(&self) -> u8;
+    fn is_ability_overriden(&self) -> PkmnResult<u8>;
-    fn allowed_experience_gain(&self) -> bool;
+    fn allowed_experience_gain(&self) -> PkmnResult<bool>;
-    fn is_usable(&self) -> bool;
+    fn is_usable(&self) -> PkmnResult<bool>;
 
     fn library(&self) -> DynamicLibrary;
     fn flat_stats(&self) -> StatisticSet<u32>;
@@ -45,25 +46,30 @@ pub trait PokemonTrait: WithVolatile {
     fn boosted_stats(&self) -> StatisticSet<u32>;
     fn individual_values(&self) -> ClampedStatisticSet<u8>;
     fn effort_values(&self) -> ClampedStatisticSet<u8>;
-    fn has_held_item(&self, name: &str) -> bool;
+    fn has_held_item(&self, name: &str) -> PkmnResult<bool>;
-    fn set_held_item(&self, item: &Item) -> Option<Item>;
+    fn set_held_item(&self, item: &Item) -> PkmnResult<Option<Item>>;
-    fn remove_held_item(&self) -> Option<Item>;
+    fn remove_held_item(&self) -> PkmnResult<Option<Item>>;
-    fn consume_held_item(&self) -> bool;
+    fn consume_held_item(&self) -> PkmnResult<bool>;
-    fn max_health(&self) -> u32;
+    fn max_health(&self) -> PkmnResult<u32>;
-    fn get_type(&self, index: usize) -> u8;
+    fn get_type(&self, index: usize) -> PkmnResult<u8>;
-    fn has_type(&self, type_identifier: TypeIdentifier) -> bool;
+    fn has_type(&self, type_identifier: TypeIdentifier) -> PkmnResult<bool>;
-    fn has_type_by_name(&self, type_name: &str) -> bool;
+    fn has_type_by_name(&self, type_name: &str) -> PkmnResult<bool>;
-    fn get_learned_move(&self, index: usize) -> Option<LearnedMove>;
+    fn get_learned_move(&self, index: usize) -> PkmnResult<Option<LearnedMove>>;
-    fn change_stat_boost(&self, stat: Statistic, diff_amount: i8, self_inflicted: bool) -> bool;
+    fn change_stat_boost(
-    fn ability_script(&self) -> Option<&Box<dyn Script>>;
+        &self,
+        stat: Statistic,
+        diff_amount: i8,
+        self_inflicted: bool,
+    ) -> PkmnResult<bool>;
+    fn ability_script(&self) -> PkmnResult<Option<&Box<dyn Script>>>;
     fn change_species(&self, species: Species, form: Form);
     fn change_form(&self, form: Form);
-    fn is_fainted(&self) -> bool;
+    fn is_fainted(&self) -> PkmnResult<bool>;
-    fn damage(&self, damage: u32, source: DamageSource);
+    fn damage(&self, damage: u32, source: DamageSource) -> PkmnResult<()>;
-    fn heal(&self, amount: u32, allow_revive: bool) -> bool;
+    fn heal(&self, amount: u32, allow_revive: bool) -> PkmnResult<bool>;
     fn set_weight(&self, weight: f32);
     fn clear_status(&self);
-    fn battle_side(&self) -> BattleSide;
+    fn battle_side(&self) -> PkmnResult<BattleSide>;
     fn equals(&self, other: &Pokemon) -> bool;
 }
 
@@ -84,6 +90,7 @@ pub enum DamageSource {
 #[cfg(not(feature = "mock_data"))]
 mod implementation {
     use super::*;
+    use core::mem::transmute;
     use cstr_core::CString;
 
     use crate::app_interface::dynamic_data::dynamic_library::DynamicLibraryImpl;
@@ -92,12 +99,13 @@ mod implementation {
         StatisticSetImpl,
     };
     use crate::handling::cached_value::CachedValue;
+    use crate::handling::wasm_result::WasmResult;
     use crate::handling::Cacheable;
     use crate::implementation::ScriptPtr;
     use crate::{
         cached_value, cached_value_getters, wasm_optional_reference_getters_extern,
         wasm_reference_getters_extern, wasm_value_getters_extern, wasm_value_getters_funcs,
-        ExternRef, ExternalReferenceType,
+        ExternRef, ExternalReferenceType, PkmnResult,
     };
 
     struct PokemonInner {
@@ -134,90 +142,154 @@ mod implementation {
             fn effort_values(&self) -> ClampedStatisticSet<u8>;
         }
 
-        fn active_ability(&self) -> Ability {
+        fn nickname(&self) -> PkmnResult<*const u8> {
             unsafe {
+                let nickname = pokemon_get_nickname(self.inner.reference).as_res()?;
+                Ok(nickname as *const u8)
+            }
+        }
+        fn species(&self) -> PkmnResult<Species> {
+            Ok(unsafe {
+                Rc::new(
+                    pokemon_get_species(self.inner.reference)
+                        .as_res()?
+                        .get_value()
+                        .unwrap(),
+                )
+            })
+        }
+        fn form(&self) -> PkmnResult<Form> {
+            Ok(unsafe {
+                Rc::new(
+                    pokemon_get_form(self.inner.reference)
+                        .as_res()?
+                        .get_value()
+                        .unwrap(),
+                )
+            })
+        }
+        fn active_ability(&self) -> PkmnResult<Ability> {
+            Ok(unsafe {
                 let implementation = pokemon_get_active_ability(self.reference())
+                    .as_res()?
                     .get_value()
                     .unwrap();
                 Rc::new(implementation)
-            }
+            })
         }
-        fn held_item(&self) -> Option<Item> {
+        fn nature(&self) -> PkmnResult<Nature> {
-            unsafe {
+            Ok(unsafe {
-                let i = pokemon_get_held_item(self.inner.reference).get_value();
+                Rc::new(
-                if let Some(i) = i {
+                    pokemon_get_nature(self.inner.reference)
-                    Some(Rc::new(i))
+                        .as_res()?
-                } else {
+                        .get_value()
-                    None
+                        .unwrap(),
-                }
+                )
-            }
+            })
         }
-        fn battle(&self) -> Option<Battle> {
+        fn display_species(&self) -> PkmnResult<Species> {
-            unsafe {
+            Ok(unsafe {
-                let b = pokemon_get_battle(self.reference()).get_value();
+                Rc::new(
-                if let Some(b) = b {
+                    pokemon_get_display_species(self.inner.reference)
-                    Some(Rc::new(b))
+                        .as_res()?
-                } else {
+                        .get_value()
-                    None
+                        .unwrap(),
-                }
+                )
-            }
+            })
         }
-        fn has_held_item(&self, name: &str) -> bool {
+        fn display_form(&self) -> PkmnResult<Form> {
-            let cstr = CString::new(name).unwrap();
+            Ok(unsafe {
-            unsafe { pokemon_has_held_item(self.inner.reference, cstr.as_ptr()) }
+                Rc::new(
+                    pokemon_get_display_form(self.inner.reference)
+                        .as_res()?
+                        .get_value()
+                        .unwrap(),
+                )
+            })
         }
-        fn set_held_item(&self, item: &Item) -> Option<Item> {
+        fn held_item(&self) -> PkmnResult<Option<Item>> {
-            unsafe {
+            Ok(unsafe {
-                let i = pokemon_set_held_item(self.inner.reference, item.reference().into())
+                let i = pokemon_get_held_item(self.inner.reference)
+                    .as_res()?
                     .get_value();
                 if let Some(i) = i {
                     Some(Rc::new(i))
                 } else {
                     None
                 }
-            }
+            })
         }
-        fn remove_held_item(&self) -> Option<Item> {
+        fn battle(&self) -> PkmnResult<Option<Battle>> {
-            unsafe {
+            Ok(unsafe {
-                let i = pokemon_remove_held_item(self.inner.reference).get_value();
+                let b = pokemon_get_battle(self.reference()).as_res()?.get_value();
-                if let Some(i) = i {
+                if let Some(b) = b {
-                    Some(Rc::new(i))
+                    Some(Rc::new(b))
                 } else {
                     None
                 }
+            })
+        }
+        fn has_held_item(&self, name: &str) -> PkmnResult<bool> {
+            let cstr = CString::new(name).unwrap();
+            unsafe { pokemon_has_held_item(self.inner.reference, cstr.as_ptr()).as_res() }
+        }
+        fn set_held_item(&self, item: &Item) -> PkmnResult<Option<Item>> {
+            unsafe {
+                let i = pokemon_set_held_item(self.inner.reference, item.reference().into())
+                    .as_res()?
+                    .get_value();
+                Ok(if let Some(i) = i {
+                    Some(Rc::new(i))
+                } else {
+                    None
+                })
             }
         }
-        fn consume_held_item(&self) -> bool {
+        fn remove_held_item(&self) -> PkmnResult<Option<Item>> {
-            unsafe { pokemon_consume_held_item(self.inner.reference) }
+            unsafe {
+                let i = pokemon_remove_held_item(self.inner.reference)
+                    .as_res()?
+                    .get_value();
+                Ok(if let Some(i) = i {
+                    Some(Rc::new(i))
+                } else {
+                    None
+                })
+            }
         }
-        fn max_health(&self) -> u32 {
+        fn consume_held_item(&self) -> PkmnResult<bool> {
+            unsafe { pokemon_consume_held_item(self.inner.reference).as_res() }
+        }
+        fn max_health(&self) -> PkmnResult<u32> {
             self.boosted_stats().hp()
         }
-        fn get_type(&self, index: usize) -> u8 {
+        fn get_type(&self, index: usize) -> PkmnResult<u8> {
-            unsafe { pokemon_get_type(self.inner.reference, index) }
+            unsafe { pokemon_get_type(self.inner.reference, index).as_res() }
         }
-        fn has_type(&self, type_identifier: TypeIdentifier) -> bool {
+        fn has_type(&self, type_identifier: TypeIdentifier) -> PkmnResult<bool> {
-            unsafe { pokemon_has_type(self.inner.reference, type_identifier.into()) }
+            unsafe { pokemon_has_type(self.inner.reference, type_identifier.into()).as_res() }
         }
-        fn has_type_by_name(&self, type_name: &str) -> bool {
+        fn has_type_by_name(&self, type_name: &str) -> PkmnResult<bool> {
             let type_identifier = self
                 .library()
                 .data_library()
                 .type_library()
-                .get_type_from_name(type_name);
+                .get_type_from_name(type_name)?;
             if let Some(type_identifier) = type_identifier {
                 return self.has_type(type_identifier);
             }
-            false
+            Ok(false)
         }
-        fn get_learned_move(&self, index: usize) -> Option<LearnedMove> {
+        fn get_learned_move(&self, index: usize) -> PkmnResult<Option<LearnedMove>> {
             unsafe {
-                let v = pokemon_get_learned_move(self.inner.reference, index).get_value();
+                let v = pokemon_get_learned_move(self.inner.reference, index)
-                if let Some(v) = v {
+                    .as_res()?
+                    .get_value();
+                Ok(if let Some(v) = v {
                     Some(Rc::new(v))
                 } else {
                     None
-                }
+                })
             }
         }
         fn change_stat_boost(
@@ -225,13 +297,18 @@ mod implementation {
             stat: Statistic,
             diff_amount: i8,
             self_inflicted: bool,
-        ) -> bool {
+        ) -> PkmnResult<bool> {
             unsafe {
                 pokemon_change_stat_boost(self.inner.reference, stat, diff_amount, self_inflicted)
+                    .as_res()
             }
         }
-        fn ability_script(&self) -> Option<&Box<dyn Script>> {
+        fn ability_script(&self) -> PkmnResult<Option<&Box<dyn Script>>> {
-            unsafe { pokemon_get_ability_script(self.inner.reference).as_ref() }
+            unsafe {
+                Ok((pokemon_get_ability_script(self.inner.reference).as_res()?
+                    as *const Box<dyn Script>)
+                    .as_ref())
+            }
         }
         fn change_species(&self, species: Species, form: Form) {
             unsafe {
@@ -245,81 +322,44 @@ mod implementation {
                 );
             }
         }
+
         fn change_form(&self, form: Form) {
             unsafe {
                 let form_impl = form.as_any().downcast_ref_unchecked::<FormImpl>();
                 pokemon_change_form(self.inner.reference, form_impl.reference());
             }
         }
-        fn is_fainted(&self) -> bool {
+
-            self.current_health() == 0
+        fn is_fainted(&self) -> PkmnResult<bool> {
+            Ok(self.current_health()? == 0)
         }
-        fn damage(&self, damage: u32, source: DamageSource) {
+        fn damage(&self, damage: u32, source: DamageSource) -> PkmnResult<()> {
-            unsafe { pokemon_damage(self.inner.reference, damage, source) }
+            unsafe { pokemon_damage(self.inner.reference, damage, source).as_res() }
         }
-        fn heal(&self, amount: u32, allow_revive: bool) -> bool {
+
-            unsafe { pokemon_heal(self.inner.reference, amount, allow_revive) }
+        fn heal(&self, amount: u32, allow_revive: bool) -> PkmnResult<bool> {
+            unsafe { pokemon_heal(self.inner.reference, amount, allow_revive).as_res() }
         }
+
         fn set_weight(&self, weight: f32) {
             unsafe {
                 pokemon_set_weight(self.reference(), weight);
             }
         }
-
-        fn nature(&self) -> Nature {
-            unsafe {
-                Rc::new(
-                    pokemon_get_nature(self.inner.reference)
-                        .get_value()
-                        .unwrap(),
-                )
-            }
-        }
-
-        fn species(&self) -> Species {
-            unsafe {
-                Rc::new(
-                    pokemon_get_species(self.inner.reference)
-                        .get_value()
-                        .unwrap(),
-                )
-            }
-        }
-        fn form(&self) -> Form {
-            unsafe { Rc::new(pokemon_get_form(self.inner.reference).get_value().unwrap()) }
-        }
-
         fn clear_status(&self) {
             unsafe {
                 pokemon_clear_status(self.reference());
             }
         }
 
-        fn display_species(&self) -> Species {
+        fn battle_side(&self) -> PkmnResult<BattleSide> {
-            unsafe {
+            Ok(self
-                Rc::new(
+                .battle()?
-                    pokemon_get_display_species(self.inner.reference)
-                        .get_value()
-                        .unwrap(),
-                )
-            }
-        }
-        fn display_form(&self) -> Form {
-            unsafe {
-                Rc::new(
-                    pokemon_get_display_form(self.inner.reference)
-                        .get_value()
-                        .unwrap(),
-                )
-            }
-        }
-
-        fn battle_side(&self) -> BattleSide {
-            self.battle()
                 .unwrap()
                 .sides()
-                .get(self.battle_side_index() as u32)
+                .get(self.battle_side_index()? as usize)
                 .unwrap()
+                .clone())
         }
 
         #[cfg(not(feature = "mock_data"))]
@@ -333,8 +373,6 @@ mod implementation {
             fn current_health(&self) -> u32;
             fn weight(&self) -> f32;
             fn height(&self) -> f32;
-            fn nickname(&self) -> *const c_char;
-            fn real_ability(&self) -> AbilityIndex;
             fn types_length(&self) -> usize;
             fn battle_side_index(&self) -> u8;
             fn battle_index(&self) -> u8;
@@ -349,45 +387,66 @@ mod implementation {
                 .get_internal_index()
                 .eq(&other.reference())
         }
+
+        fn real_ability(&self) -> PkmnResult<AbilityIndex> {
+            unsafe {
+                let real_ability = pokemon_get_real_ability(self.reference()).as_res()?;
+                let split: (u8, u8) = transmute(real_ability);
+                Ok(AbilityIndex {
+                    index: split.0,
+                    hidden: split.1 == 1,
+                })
+            }
+        }
     }
 
     #[cfg(not(feature = "mock_data"))]
     impl WithVolatile for PokemonImpl {
-        fn has_volatile(&self, script_name: &str) -> bool {
+        fn has_volatile(&self, script_name: &str) -> PkmnResult<bool> {
             unsafe {
                 let ptr = CString::new(script_name).unwrap();
-                pokemon_has_volatile(self.inner.reference, ptr.as_ptr())
+                pokemon_has_volatile(self.inner.reference, ptr.as_ptr()).as_res()
             }
         }
 
-        fn add_volatile(&self, script: Box<dyn Script>) -> &dyn Script {
+        fn add_volatile(&self, script: Box<dyn Script>) -> PkmnResult<&dyn Script> {
             unsafe {
-                pokemon_add_volatile(self.inner.reference, ScriptPtr::new(script))
+                Ok(
-                    .val()
+                    pokemon_add_volatile(self.inner.reference, ScriptPtr::new(script))
-                    .unwrap()
+                        .as_res()?
+                        .val()
+                        .unwrap(),
+                )
             }
         }
 
-        fn add_volatile_by_name(&self, script_name: &str) -> &dyn Script {
+        fn add_volatile_by_name(&self, script_name: &str) -> PkmnResult<&dyn Script> {
             unsafe {
                 let ptr = CString::new(script_name).unwrap();
-                pokemon_add_volatile_by_name(self.inner.reference, ptr.as_ptr())
+                Ok(
-                    .val()
+                    pokemon_add_volatile_by_name(self.inner.reference, ptr.as_ptr())
-                    .unwrap()
+                        .as_res()?
+                        .val()
+                        .unwrap(),
+                )
             }
         }
 
-        fn remove_volatile(&self, script: &dyn Script) {
+        fn remove_volatile(&self, script: &dyn Script) -> PkmnResult<()> {
             unsafe {
                 let name = CString::new(script.get_name()).unwrap();
-                pokemon_remove_volatile(self.inner.reference, name.as_ptr());
+                pokemon_remove_volatile(self.inner.reference, name.as_ptr()).as_res()
             }
         }
 
-        fn get_volatile_script(&self, script_name: &str) -> Option<&dyn Script> {
+        fn get_volatile_script(&self, script_name: &str) -> PkmnResult<Option<&dyn Script>> {
             unsafe {
                 let script_name = CString::new(script_name).unwrap();
-                pokemon_get_volatile(self.inner.reference, script_name.as_ptr()).val()
+                Ok(
+                    pokemon_get_volatile(self.inner.reference, script_name.as_ptr())
+                        .as_res()?
+                        .val(),
+                )
             }
         }
     }
@@ -398,24 +457,41 @@ mod implementation {
                 inner: Rc::new(PokemonInner {
                     reference,
                     library: cached_value!({
-                        Rc::new(pokemon_get_library(reference).get_value().unwrap())
+                        Rc::new(pokemon_get_library(reference).unwrap().get_value().unwrap())
                     }),
                     flat_stats: cached_value!({
-                        Rc::new(pokemon_get_flat_stats(reference).get_value().unwrap())
+                        Rc::new(
+                            pokemon_get_flat_stats(reference)
+                                .unwrap()
+                                .get_value()
+                                .unwrap(),
+                        )
                     }),
                     stat_boosts: cached_value!({
-                        pokemon_get_stat_boosts(reference).get_value().unwrap()
+                        pokemon_get_stat_boosts(reference)
+                            .unwrap()
+                            .get_value()
+                            .unwrap()
                     }),
                     boosted_stats: cached_value!({
-                        Rc::new(pokemon_get_boosted_stats(reference).get_value().unwrap())
+                        Rc::new(
+                            pokemon_get_boosted_stats(reference)
+                                .unwrap()
+                                .get_value()
+                                .unwrap(),
+                        )
                     }),
                     individual_values: cached_value!({
                         pokemon_get_individual_values(reference)
+                            .unwrap()
                             .get_value()
                             .unwrap()
                     }),
                     effort_values: cached_value!({
-                        pokemon_get_effort_values(reference).get_value().unwrap()
+                        pokemon_get_effort_values(reference)
+                            .unwrap()
+                            .get_value()
+                            .unwrap()
                     }),
                 }),
             })
@@ -430,14 +506,14 @@ mod implementation {
         PokemonImpl, Pokemon,
         pub fn species(&self) -> SpeciesImpl;
         pub fn form(&self) -> FormImpl;
+        pub fn display_species(&self) -> SpeciesImpl;
+        pub fn display_form(&self) -> FormImpl;
         pub fn active_ability(&self) -> AbilityImpl;
         pub fn nature(&self) -> NatureImpl;
     }
 
     wasm_optional_reference_getters_extern! {
         PokemonImpl, Pokemon,
-        pub fn display_species(&self) -> Option<SpeciesImpl>;
-        pub fn display_form(&self) -> Option<FormImpl>;
         pub fn held_item(&self) -> Option<ItemImpl>;
         pub fn battle(&self) -> Option<BattleImpl>;
     }
@@ -452,8 +528,7 @@ mod implementation {
         pub fn current_health(&self) -> u32;
         pub fn weight(&self) -> f32;
         pub fn height(&self) -> f32;
-        pub fn nickname(&self) -> *const c_char;
+        pub fn real_ability(&self) -> u16;
-        pub fn real_ability(&self) -> AbilityIndex;
         pub fn types_length(&self) -> usize;
         pub fn battle_side_index(&self) -> u8;
         pub fn battle_index(&self) -> u8;
@@ -477,58 +552,89 @@ mod implementation {
     }
 
     extern "wasm" {
-        fn pokemon_get_library(r: ExternRef<PokemonImpl>) -> ExternRef<DynamicLibraryImpl>;
+        fn pokemon_get_nickname(r: ExternRef<PokemonImpl>) -> WasmResult<u32>;
-        fn pokemon_get_flat_stats(r: ExternRef<PokemonImpl>) -> ExternRef<StatisticSetImpl<u32>>;
+        fn pokemon_get_library(
-        fn pokemon_get_stat_boosts(r: ExternRef<PokemonImpl>)
+            r: ExternRef<PokemonImpl>,
-            -> ExternRef<ClampedStatisticSet<i8>>;
+        ) -> WasmResult<ExternRef<DynamicLibraryImpl>>;
-        fn pokemon_get_boosted_stats(r: ExternRef<PokemonImpl>)
+        fn pokemon_get_flat_stats(
-            -> ExternRef<StatisticSetImpl<u32>>;
+            r: ExternRef<PokemonImpl>,
+        ) -> WasmResult<ExternRef<StatisticSetImpl<u32>>>;
+        fn pokemon_get_stat_boosts(
+            r: ExternRef<PokemonImpl>,
+        ) -> WasmResult<ExternRef<ClampedStatisticSet<i8>>>;
+        fn pokemon_get_boosted_stats(
+            r: ExternRef<PokemonImpl>,
+        ) -> WasmResult<ExternRef<StatisticSetImpl<u32>>>;
         fn pokemon_get_individual_values(
             r: ExternRef<PokemonImpl>,
-        ) -> ExternRef<ClampedStatisticSet<u8>>;
+        ) -> WasmResult<ExternRef<ClampedStatisticSet<u8>>>;
         fn pokemon_get_effort_values(
             r: ExternRef<PokemonImpl>,
-        ) -> ExternRef<ClampedStatisticSet<u8>>;
+        ) -> WasmResult<ExternRef<ClampedStatisticSet<u8>>>;
-        fn pokemon_has_held_item(r: ExternRef<PokemonImpl>, name: *const c_char) -> bool;
+        fn pokemon_has_held_item(
+            r: ExternRef<PokemonImpl>,
+            name: *const c_char,
+        ) -> WasmResult<bool>;
         fn pokemon_set_held_item(
             r: ExternRef<PokemonImpl>,
             item: ExternRef<ItemImpl>,
-        ) -> ExternRef<ItemImpl>;
+        ) -> WasmResult<ExternRef<ItemImpl>>;
-        fn pokemon_remove_held_item(r: ExternRef<PokemonImpl>) -> ExternRef<ItemImpl>;
+        fn pokemon_remove_held_item(r: ExternRef<PokemonImpl>) -> WasmResult<ExternRef<ItemImpl>>;
-        fn pokemon_consume_held_item(r: ExternRef<PokemonImpl>) -> bool;
+        fn pokemon_consume_held_item(r: ExternRef<PokemonImpl>) -> WasmResult<bool>;
-        fn pokemon_get_type(r: ExternRef<PokemonImpl>, index: usize) -> u8;
+        fn pokemon_get_type(r: ExternRef<PokemonImpl>, index: usize) -> WasmResult<u8>;
-        fn pokemon_has_type(r: ExternRef<PokemonImpl>, identifier: u8) -> bool;
+        fn pokemon_has_type(r: ExternRef<PokemonImpl>, identifier: u8) -> WasmResult<bool>;
         fn pokemon_get_learned_move(
             r: ExternRef<PokemonImpl>,
             index: usize,
-        ) -> ExternRef<LearnedMoveImpl>;
+        ) -> WasmResult<ExternRef<LearnedMoveImpl>>;
         fn pokemon_change_stat_boost(
             r: ExternRef<PokemonImpl>,
             tat: Statistic,
             diff_amount: i8,
             self_inflicted: bool,
-        ) -> bool;
+        ) -> WasmResult<bool>;
         #[allow(improper_ctypes)]
-        fn pokemon_get_ability_script(r: ExternRef<PokemonImpl>) -> *const Box<dyn Script>;
+        fn pokemon_get_ability_script(r: ExternRef<PokemonImpl>) -> WasmResult<u32>;
         fn pokemon_change_species(
             r: ExternRef<PokemonImpl>,
             species: ExternRef<SpeciesImpl>,
             form: ExternRef<FormImpl>,
-        );
+        ) -> WasmResult<()>;
-        fn pokemon_change_form(r: ExternRef<PokemonImpl>, form: ExternRef<FormImpl>);
+        fn pokemon_change_form(
-        fn pokemon_damage(r: ExternRef<PokemonImpl>, damage: u32, source: DamageSource);
+            r: ExternRef<PokemonImpl>,
-        fn pokemon_heal(r: ExternRef<PokemonImpl>, amount: u32, allow_revive: bool) -> bool;
+            form: ExternRef<FormImpl>,
-        fn pokemon_set_weight(r: ExternRef<PokemonImpl>, weight: f32);
+        ) -> WasmResult<()>;
-        fn pokemon_clear_status(r: ExternRef<PokemonImpl>);
+        fn pokemon_damage(
+            r: ExternRef<PokemonImpl>,
+            damage: u32,
+            source: DamageSource,
+        ) -> WasmResult<()>;
+        fn pokemon_heal(
+            r: ExternRef<PokemonImpl>,
+            amount: u32,
+            allow_revive: bool,
+        ) -> WasmResult<bool>;
+        fn pokemon_set_weight(r: ExternRef<PokemonImpl>, weight: f32) -> WasmResult<()>;
+        fn pokemon_clear_status(r: ExternRef<PokemonImpl>) -> WasmResult<()>;
 
         fn pokemon_add_volatile_by_name(
             r: ExternRef<PokemonImpl>,
             name: *const c_char,
-        ) -> ScriptPtr;
+        ) -> WasmResult<ScriptPtr>;
-        fn pokemon_add_volatile(r: ExternRef<PokemonImpl>, script: ScriptPtr) -> ScriptPtr;
+        fn pokemon_add_volatile(
-        fn pokemon_has_volatile(r: ExternRef<PokemonImpl>, name: *const c_char) -> bool;
+            r: ExternRef<PokemonImpl>,
-        fn pokemon_remove_volatile(r: ExternRef<PokemonImpl>, name: *const c_char);
+            script: ScriptPtr,
-        fn pokemon_get_volatile(r: ExternRef<PokemonImpl>, name: *const c_char) -> ScriptPtr;
+        ) -> WasmResult<ScriptPtr>;
+        fn pokemon_has_volatile(r: ExternRef<PokemonImpl>, name: *const c_char)
+            -> WasmResult<bool>;
+        fn pokemon_remove_volatile(
+            r: ExternRef<PokemonImpl>,
+            name: *const c_char,
+        ) -> WasmResult<()>;
+        fn pokemon_get_volatile(
+            r: ExternRef<PokemonImpl>,
+            name: *const c_char,
+        ) -> WasmResult<ScriptPtr>;
     }
 }
 
@@ -537,30 +643,30 @@ mockall::mock!(
     pub Pokemon {}
     impl PokemonTrait for Pokemon {
         fn reference(&self) -> u32;
-        fn species(&self) -> Species;
+        fn species(&self) -> PkmnResult<Species>;
-        fn form(&self) -> Form;
+        fn form(&self) -> PkmnResult<Form>;
-        fn active_ability(&self) -> Ability;
+        fn active_ability(&self) -> PkmnResult<Ability>;
-        fn nature(&self) -> Nature;
+        fn nature(&self) -> PkmnResult<Nature>;
-        fn display_species(&self) -> Species;
+        fn display_species(&self) -> PkmnResult<Species>;
-        fn display_form(&self) -> Form;
+        fn display_form(&self) -> PkmnResult<Form>;
-        fn held_item(&self) -> Option<Item>;
+        fn held_item(&self) -> PkmnResult<Option<Item>>;
-        fn battle(&self) -> Option<Battle>;
+        fn battle(&self) -> PkmnResult<Option<Battle>>;
-        fn level(&self) -> LevelInt;
+        fn level(&self) -> PkmnResult<LevelInt>;
-        fn experience(&self) -> u32;
+        fn experience(&self) -> PkmnResult<u32>;
-        fn unique_identifier(&self) -> u32;
+        fn unique_identifier(&self) -> PkmnResult<u32>;
-        fn gender(&self) -> Gender;
+        fn gender(&self) -> PkmnResult<Gender>;
-        fn coloring(&self) -> u8;
+        fn coloring(&self) -> PkmnResult<u8>;
-        fn current_health(&self) -> u32;
+        fn current_health(&self) -> PkmnResult<u32>;
-        fn weight(&self) -> f32;
+        fn weight(&self) -> PkmnResult<f32>;
-        fn height(&self) -> f32;
+        fn height(&self) -> PkmnResult<f32>;
-        fn nickname(&self) -> *const c_char;
+        fn nickname(&self) -> PkmnResult<*const c_char>;
-        fn real_ability(&self) -> AbilityIndex;
+        fn real_ability(&self) -> PkmnResult<AbilityIndex>;
-        fn types_length(&self) -> usize;
+        fn types_length(&self) -> PkmnResult<usize>;
-        fn battle_side_index(&self) -> u8;
+        fn battle_side_index(&self) -> PkmnResult<u8>;
-        fn battle_index(&self) -> u8;
+        fn battle_index(&self) -> PkmnResult<u8>;
-        fn is_ability_overriden(&self) -> u8;
+        fn is_ability_overriden(&self) -> PkmnResult<u8>;
-        fn allowed_experience_gain(&self) -> bool;
+        fn allowed_experience_gain(&self) -> PkmnResult<bool>;
-        fn is_usable(&self) -> bool;
+        fn is_usable(&self) -> PkmnResult<bool>;
 
         fn library(&self) -> DynamicLibrary;
         fn flat_stats(&self) -> StatisticSet<u32>;
@@ -568,44 +674,44 @@ mockall::mock!(
         fn boosted_stats(&self) -> StatisticSet<u32>;
         fn individual_values(&self) -> ClampedStatisticSet<u8>;
         fn effort_values(&self) -> ClampedStatisticSet<u8>;
-        fn has_held_item(&self, name: &str) -> bool;
+        fn has_held_item(&self, name: &str) -> PkmnResult<bool>;
-        fn set_held_item(&self, item: &Item) -> Option<Item>;
+        fn set_held_item(&self, item: &Item) -> PkmnResult<Option<Item>>;
-        fn remove_held_item(&self) -> Option<Item>;
+        fn remove_held_item(&self) -> PkmnResult<Option<Item>>;
-        fn consume_held_item(&self) -> bool;
+        fn consume_held_item(&self) -> PkmnResult<bool>;
-        fn max_health(&self) -> u32;
+        fn max_health(&self) -> PkmnResult<u32>;
-        fn get_type(&self, index: usize) -> u8;
+        fn get_type(&self, index: usize) -> PkmnResult<u8>;
-        fn has_type(&self, type_identifier: TypeIdentifier) -> bool;
+        fn has_type(&self, type_identifier: TypeIdentifier) -> PkmnResult<bool>;
-        fn has_type_by_name(&self, type_name: &str) -> bool;
+        fn has_type_by_name(&self, type_name: &str) -> PkmnResult<bool>;
-        fn get_learned_move(&self, index: usize) -> Option<LearnedMove>;
+        fn get_learned_move(&self, index: usize) -> PkmnResult<Option<LearnedMove>>;
-        fn change_stat_boost(&self, stat: Statistic, diff_amount: i8, self_inflicted: bool) -> bool;
+        fn change_stat_boost(&self, stat: Statistic, diff_amount: i8, self_inflicted: bool) -> PkmnResult<bool>;
-        fn ability_script<'a>(&'a self) -> Option<&'a Box<dyn Script>>;
+        fn ability_script<'a>(&'a self) -> PkmnResult<Option<&'a Box<dyn Script>>>;
         fn change_species(&self, species: Species, form: Form);
         fn change_form(&self, form: Form);
-        fn is_fainted(&self) -> bool;
+        fn is_fainted(&self) -> PkmnResult<bool>;
-        fn damage(&self, damage: u32, source: DamageSource);
+        fn damage(&self, damage: u32, source: DamageSource) -> PkmnResult<()>;
-        fn heal(&self, amount: u32, allow_revive: bool) -> bool;
+        fn heal(&self, amount: u32, allow_revive: bool) -> PkmnResult<bool>;
         fn set_weight(&self, weight: f32);
         fn clear_status(&self);
-        fn battle_side(&self) -> BattleSide;
+        fn battle_side(&self) -> PkmnResult<BattleSide>;
         fn equals(&self, other: &Pokemon) -> bool;
     }
 );
 
 #[cfg(feature = "mock_data")]
 impl WithVolatile for MockPokemon {
-    fn has_volatile(&self, _script_name: &str) -> bool {
+    fn has_volatile(&self, _script_name: &str) -> PkmnResult<bool> {
         unimplemented!()
     }
-    fn add_volatile(&self, _script: Box<dyn Script>) -> &dyn Script {
+    fn add_volatile(&self, _script: Box<dyn Script>) -> PkmnResult<&dyn Script> {
         unimplemented!()
     }
-    fn add_volatile_by_name(&self, _script_name: &str) -> &dyn Script {
+    fn add_volatile_by_name(&self, _script_name: &str) -> PkmnResult<&dyn Script> {
         unimplemented!()
     }
-    fn remove_volatile(&self, _script: &dyn Script) {
+    fn remove_volatile(&self, _script: &dyn Script) -> PkmnResult<()> {
         unimplemented!()
     }
-    fn get_volatile_script<'a>(&'a self, _script_name: &str) -> Option<&'a dyn Script> {
+    fn get_volatile_script<'a>(&'a self, _script_name: &str) -> PkmnResult<Option<&'a dyn Script>> {
         unimplemented!()
     }
 }

pkmn_lib_interface/src/app_interface/dynamic_data/statistic_set.rs

@@ -1,5 +1,7 @@
 use crate::app_interface::Statistic;
-use crate::{ExternRef, ExternalReferenceType};
+#[cfg(not(feature = "mock_data"))]
+use crate::handling::wasm_result::WasmResult;
+use crate::{ExternRef, ExternalReferenceType, PkmnResult};
 use alloc::rc::Rc;
 use core::convert::{TryFrom, TryInto};
 use core::fmt::Debug;
@@ -12,28 +14,28 @@ where
     <T as TryFrom<i64>>::Error: Debug,
     <T as TryInto<i64>>::Error: Debug,
 {
-    fn hp(&self) -> T {
+    fn hp(&self) -> PkmnResult<T> {
         self.get_stat(Statistic::Attack)
     }
-    fn attack(&self) -> T {
+    fn attack(&self) -> PkmnResult<T> {
         self.get_stat(Statistic::Attack)
     }
-    fn defense(&self) -> T {
+    fn defense(&self) -> PkmnResult<T> {
         self.get_stat(Statistic::Defense)
     }
-    fn special_attack(&self) -> T {
+    fn special_attack(&self) -> PkmnResult<T> {
         self.get_stat(Statistic::SpecialAttack)
     }
-    fn special_defense(&self) -> T {
+    fn special_defense(&self) -> PkmnResult<T> {
         self.get_stat(Statistic::SpecialDefense)
     }
-    fn speed(&self) -> T {
+    fn speed(&self) -> PkmnResult<T> {
         self.get_stat(Statistic::Speed)
     }
-    fn get_stat(&self, stat: Statistic) -> T;
+    fn get_stat(&self, stat: Statistic) -> PkmnResult<T>;
-    fn set_stat(&self, stat: Statistic, value: T);
+    fn set_stat(&self, stat: Statistic, value: T) -> PkmnResult<()>;
-    fn increase_stat(&self, stat: Statistic, value: T);
+    fn increase_stat(&self, stat: Statistic, value: T) -> PkmnResult<()>;
-    fn decrease_stat(&self, stat: Statistic, value: T);
+    fn decrease_stat(&self, stat: Statistic, value: T) -> PkmnResult<()>;
 }
 
 pub type StatisticSet<T> = Rc<dyn StatisticSetTrait<T>>;
@@ -74,24 +76,29 @@ where
     <T as TryFrom<i64>>::Error: Debug,
     <T as TryInto<i64>>::Error: Debug,
 {
-    fn get_stat(&self, stat: Statistic) -> T {
+    fn get_stat(&self, stat: Statistic) -> PkmnResult<T> {
         unsafe {
-            statistic_set_get(self.reference.cast(), stat)
+            Ok(statistic_set_get(self.reference.cast(), stat)
+                .as_res()?
                 .try_into()
-                .unwrap()
+                .unwrap())
         }
     }
-    fn set_stat(&self, stat: Statistic, value: T) {
+    fn set_stat(&self, stat: Statistic, value: T) -> PkmnResult<()> {
-        unsafe { statistic_set_set(self.reference.cast(), stat, value.try_into().unwrap()) }
+        unsafe {
+            statistic_set_set(self.reference.cast(), stat, value.try_into().unwrap()).as_res()
+        }
     }
-    fn increase_stat(&self, stat: Statistic, value: T) {
+    fn increase_stat(&self, stat: Statistic, value: T) -> PkmnResult<()> {
         unsafe {
             statistic_set_increase_stat(self.reference.cast(), stat, value.try_into().unwrap())
+                .as_res()
         }
     }
-    fn decrease_stat(&self, stat: Statistic, value: T) {
+    fn decrease_stat(&self, stat: Statistic, value: T) -> PkmnResult<()> {
         unsafe {
             statistic_set_decrease_stat(self.reference.cast(), stat, value.try_into().unwrap())
+                .as_res()
         }
     }
 }
@@ -136,62 +143,68 @@ where
     }
 
     #[cfg(not(feature = "mock_data"))]
-    pub fn hp(&self) -> T {
+    pub fn hp(&self) -> PkmnResult<T> {
         self.get_stat(Statistic::HP)
     }
     #[cfg(not(feature = "mock_data"))]
-    pub fn attack(&self) -> T {
+    pub fn attack(&self) -> PkmnResult<T> {
         self.get_stat(Statistic::Attack)
     }
     #[cfg(not(feature = "mock_data"))]
-    pub fn defense(&self) -> T {
+    pub fn defense(&self) -> PkmnResult<T> {
         self.get_stat(Statistic::Defense)
     }
     #[cfg(not(feature = "mock_data"))]
-    pub fn special_attack(&self) -> T {
+    pub fn special_attack(&self) -> PkmnResult<T> {
         self.get_stat(Statistic::SpecialAttack)
     }
     #[cfg(not(feature = "mock_data"))]
-    pub fn special_defense(&self) -> T {
+    pub fn special_defense(&self) -> PkmnResult<T> {
         self.get_stat(Statistic::SpecialDefense)
     }
     #[cfg(not(feature = "mock_data"))]
-    pub fn speed(&self) -> T {
+    pub fn speed(&self) -> PkmnResult<T> {
         self.get_stat(Statistic::Speed)
     }
 
     #[cfg(not(feature = "mock_data"))]
-    pub fn get_stat(&self, stat: Statistic) -> T {
+    pub fn get_stat(&self, stat: Statistic) -> PkmnResult<T> {
         unsafe {
-            clamped_statistic_set_get(self.reference.cast(), stat)
+            Ok(clamped_statistic_set_get(self.reference.cast(), stat)
+                .as_res()?
                 .try_into()
-                .unwrap()
+                .unwrap())
         }
     }
 
     #[cfg(not(feature = "mock_data"))]
-    pub fn set_stat(&self, stat: Statistic, value: T) {
+    pub fn set_stat(&self, stat: Statistic, value: T) -> PkmnResult<()> {
-        unsafe { clamped_statistic_set_set(self.reference.cast(), stat, value.try_into().unwrap()) }
+        unsafe {
+            clamped_statistic_set_set(self.reference.cast(), stat, value.try_into().unwrap())
+                .as_res()
+        }
     }
 
     #[cfg(not(feature = "mock_data"))]
-    pub fn increase_stat(&self, stat: Statistic, value: T) -> bool {
+    pub fn increase_stat(&self, stat: Statistic, value: T) -> PkmnResult<bool> {
         unsafe {
             clamped_statistic_set_increase_stat(
                 self.reference.cast(),
                 stat,
                 value.try_into().unwrap(),
             )
+            .as_res()
         }
     }
     #[cfg(not(feature = "mock_data"))]
-    pub fn decrease_stat(&self, stat: Statistic, value: T) -> bool {
+    pub fn decrease_stat(&self, stat: Statistic, value: T) -> PkmnResult<bool> {
         unsafe {
             clamped_statistic_set_decrease_stat(
                 self.reference.cast(),
                 stat,
                 value.try_into().unwrap(),
             )
+            .as_res()
         }
     }
 }
@@ -210,33 +223,40 @@ where
 
 #[cfg(not(feature = "mock_data"))]
 extern "wasm" {
-    fn statistic_set_get(r: ExternRef<StatisticSetImpl<i64>>, stat: Statistic) -> i64;
+    fn statistic_set_get(r: ExternRef<StatisticSetImpl<i64>>, stat: Statistic) -> WasmResult<i64>;
-    fn statistic_set_set(r: ExternRef<StatisticSetImpl<i64>>, stat: Statistic, value: i64);
+    fn statistic_set_set(
+        r: ExternRef<StatisticSetImpl<i64>>,
+        stat: Statistic,
+        value: i64,
+    ) -> WasmResult<()>;
     fn statistic_set_increase_stat(
         r: ExternRef<StatisticSetImpl<i64>>,
         stat: Statistic,
         value: i64,
-    );
+    ) -> WasmResult<()>;
     fn statistic_set_decrease_stat(
         r: ExternRef<StatisticSetImpl<i64>>,
         stat: Statistic,
         value: i64,
-    );
+    ) -> WasmResult<()>;
 
-    fn clamped_statistic_set_get(r: ExternRef<ClampedStatisticSet<i64>>, stat: Statistic) -> i64;
+    fn clamped_statistic_set_get(
+        r: ExternRef<ClampedStatisticSet<i64>>,
+        stat: Statistic,
+    ) -> WasmResult<i64>;
     fn clamped_statistic_set_set(
         r: ExternRef<ClampedStatisticSet<i64>>,
         stat: Statistic,
         value: i64,
-    );
+    ) -> WasmResult<()>;
     fn clamped_statistic_set_increase_stat(
         r: ExternRef<ClampedStatisticSet<i64>>,
         stat: Statistic,
         value: i64,
-    ) -> bool;
+    ) -> WasmResult<bool>;
     fn clamped_statistic_set_decrease_stat(
         r: ExternRef<ClampedStatisticSet<i64>>,
         stat: Statistic,
         value: i64,
-    ) -> bool;
+    ) -> WasmResult<bool>;
 }

pkmn_lib_interface/src/app_interface/dynamic_data/turn_choices.rs

@@ -25,13 +25,13 @@ impl TurnChoice {
     pub fn user(&self) -> Pokemon {
         self.base().user()
     }
-    pub fn speed(&self) -> u32 {
+    pub fn speed(&self) -> PkmnResult<u32> {
         self.base().speed()
     }
-    pub fn has_failed(&self) -> bool {
+    pub fn has_failed(&self) -> PkmnResult<bool> {
         self.base().has_failed()
     }
-    pub fn fail(&self) {
+    pub fn fail(&self) -> PkmnResult<()> {
         self.base().fail()
     }
 }
@@ -40,9 +40,9 @@ impl TurnChoice {
 pub trait BaseTurnChoiceDataTrait {
     fn reference(&self) -> u32;
     fn user(&self) -> Pokemon;
-    fn speed(&self) -> u32;
+    fn speed(&self) -> PkmnResult<u32>;
-    fn has_failed(&self) -> bool;
+    fn has_failed(&self) -> PkmnResult<bool>;
-    fn fail(&self);
+    fn fail(&self) -> PkmnResult<()>;
 }
 
 pub type BaseTurnChoiceData = Rc<dyn BaseTurnChoiceDataTrait>;
@@ -55,8 +55,8 @@ pub trait MoveTurnChoiceDataTrait {
     fn used_move(&self) -> LearnedMove;
     fn target_side(&self) -> u8;
     fn target_index(&self) -> u8;
-    fn priority(&self) -> i8;
+    fn priority(&self) -> PkmnResult<i8>;
-    fn move_script<'a>(&self) -> Option<&'a Box<dyn Script>>;
+    fn move_script<'a>(&self) -> PkmnResult<Option<&'a Box<dyn Script>>>;
 }
 #[cfg(feature = "mock_data")]
 pub type MockMoveTurnChoiceData = MockMoveTurnChoiceDataTrait;
@@ -65,10 +65,11 @@ pub type MockMoveTurnChoiceData = MockMoveTurnChoiceDataTrait;
 mod implementation {
     use super::*;
     use crate::app_interface::{LearnedMoveImpl, PokemonImpl};
-    use crate::cached_value;
     use crate::handling::cached_value::CachedValue;
     use crate::handling::extern_ref::{ExternRef, ExternalReferenceType};
     use crate::handling::temporary::Temporary;
+    use crate::handling::wasm_result::WasmResult;
+    use crate::{cached_value, PkmnResult};
 
     struct BaseTurnChoiceDataImpl {
         reference: ExternRef<TurnChoice>,
@@ -83,14 +84,14 @@ mod implementation {
         fn user(&self) -> Pokemon {
             self.user.value()
         }
-        fn speed(&self) -> u32 {
+        fn speed(&self) -> PkmnResult<u32> {
-            unsafe { turn_choice_get_speed(self.reference) }
+            unsafe { turn_choice_get_speed(self.reference).as_res() }
         }
-        fn has_failed(&self) -> bool {
+        fn has_failed(&self) -> PkmnResult<bool> {
-            unsafe { turn_choice_has_failed(self.reference) }
+            unsafe { turn_choice_has_failed(self.reference).as_res() }
         }
-        fn fail(&self) {
+        fn fail(&self) -> PkmnResult<()> {
-            unsafe { turn_choice_fail(self.reference) }
+            unsafe { turn_choice_fail(self.reference).as_res() }
         }
     }
 
@@ -121,18 +122,24 @@ mod implementation {
         fn target_index(&self) -> u8 {
             self.inner.value().target_index.value()
         }
-        fn priority(&self) -> i8 {
+        fn priority(&self) -> PkmnResult<i8> {
-            unsafe { turn_choice_move_priority(self.base().reference().into()) }
+            unsafe { turn_choice_move_priority(self.base().reference().into()).as_res() }
         }
-        fn move_script<'a>(&self) -> Option<&'a Box<dyn Script>> {
+        fn move_script<'a>(&self) -> PkmnResult<Option<&'a Box<dyn Script>>> {
-            unsafe { turn_choice_move_script(self.base().reference().into()).as_ref() }
+            unsafe {
+                Ok(
+                    (turn_choice_move_script(self.base().reference().into()).as_res()?
+                        as *const Box<dyn Script>)
+                        .as_ref(),
+                )
+            }
         }
     }
 
     #[cfg(not(feature = "mock_data"))]
     impl ExternalReferenceType for TurnChoice {
         fn from_extern_value(reference: ExternRef<Self>) -> Self {
-            let kind = unsafe { turn_choice_get_kind(reference) };
+            let kind = unsafe { turn_choice_get_kind(reference).unwrap() };
             match kind {
                 0 => TurnChoice::Move(Box::new(MoveTurnChoiceDataImpl {
                     inner: Temporary::new(
@@ -152,39 +159,50 @@ mod implementation {
                 base: Rc::new(BaseTurnChoiceDataImpl {
                     reference: reference.cast(),
                     user: cached_value!({
-                        Rc::new(turn_choice_get_user(reference.cast()).get_value().unwrap())
+                        Rc::new(
+                            turn_choice_get_user(reference.cast())
+                                .unwrap()
+                                .get_value()
+                                .unwrap(),
+                        )
                     }),
                 }),
                 used_move: cached_value!({
                     Rc::new(
                         turn_choice_move_used_move(reference.cast())
+                            .unwrap()
                             .get_value()
                             .unwrap(),
                     )
                 }),
-                target_side: cached_value!({ turn_choice_move_target_side(reference.cast()) }),
+                target_side: cached_value!({
-                target_index: cached_value!({ turn_choice_move_target_index(reference.cast()) }),
+                    turn_choice_move_target_side(reference.cast()).unwrap()
+                }),
+                target_index: cached_value!({
+                    turn_choice_move_target_index(reference.cast()).unwrap()
+                }),
             }
         }
     }
 
     extern "wasm" {
-        fn turn_choice_get_kind(r: ExternRef<TurnChoice>) -> u8;
+        fn turn_choice_get_kind(r: ExternRef<TurnChoice>) -> WasmResult<u8>;
-        fn turn_choice_get_user(r: ExternRef<TurnChoice>) -> ExternRef<PokemonImpl>;
+        fn turn_choice_get_user(r: ExternRef<TurnChoice>) -> WasmResult<ExternRef<PokemonImpl>>;
-        fn turn_choice_get_speed(r: ExternRef<TurnChoice>) -> u32;
+        fn turn_choice_get_speed(r: ExternRef<TurnChoice>) -> WasmResult<u32>;
-        fn turn_choice_has_failed(r: ExternRef<TurnChoice>) -> bool;
+        fn turn_choice_has_failed(r: ExternRef<TurnChoice>) -> WasmResult<bool>;
-        fn turn_choice_fail(r: ExternRef<TurnChoice>);
+        fn turn_choice_fail(r: ExternRef<TurnChoice>) -> WasmResult<()>;
 
         fn turn_choice_move_used_move(
             r: ExternRef<MoveTurnChoiceDataImpl>,
-        ) -> ExternRef<LearnedMoveImpl>;
+        ) -> WasmResult<ExternRef<LearnedMoveImpl>>;
-        fn turn_choice_move_target_side(r: ExternRef<MoveTurnChoiceDataImpl>) -> u8;
+        fn turn_choice_move_target_side(r: ExternRef<MoveTurnChoiceDataImpl>) -> WasmResult<u8>;
-        fn turn_choice_move_target_index(r: ExternRef<MoveTurnChoiceDataImpl>) -> u8;
+        fn turn_choice_move_target_index(r: ExternRef<MoveTurnChoiceDataImpl>) -> WasmResult<u8>;
-        fn turn_choice_move_priority(r: ExternRef<MoveTurnChoiceDataImpl>) -> i8;
+        fn turn_choice_move_priority(r: ExternRef<MoveTurnChoiceDataImpl>) -> WasmResult<i8>;
         #[allow(improper_ctypes)]
-        fn turn_choice_move_script(r: ExternRef<MoveTurnChoiceDataImpl>) -> *const Box<dyn Script>;
+        fn turn_choice_move_script(r: ExternRef<MoveTurnChoiceDataImpl>) -> WasmResult<u32>;
     }
 }
 
+use crate::PkmnResult;
 #[cfg(not(feature = "mock_data"))]
 pub use implementation::*;

pkmn_lib_interface/src/app_interface/dynamic_data/with_volatile.rs

@@ -1,22 +1,26 @@
 use crate::handling::Script;
+use crate::PkmnResult;
 use alloc::boxed::Box;
 
 pub trait WithVolatile {
-    fn has_volatile(&self, script_name: &str) -> bool;
+    fn has_volatile(&self, script_name: &str) -> PkmnResult<bool>;
-    fn add_volatile(&self, script: Box<dyn Script>) -> &dyn Script;
+    fn add_volatile(&self, script: Box<dyn Script>) -> PkmnResult<&dyn Script>;
-    fn add_volatile_by_name(&self, script_name: &str) -> &dyn Script;
+    fn add_volatile_by_name(&self, script_name: &str) -> PkmnResult<&dyn Script>;
-    fn remove_volatile(&self, script: &dyn Script);
+    fn remove_volatile(&self, script: &dyn Script) -> PkmnResult<()>;
-    fn get_volatile_script(&self, script_name: &str) -> Option<&dyn Script>;
+    fn get_volatile_script(&self, script_name: &str) -> PkmnResult<Option<&dyn Script>>;
 }
 
-pub fn get_volatile_as<'a, T>(v: &'a dyn WithVolatile, script_name: &str) -> Option<&'a T>
+pub fn get_volatile_as<'a, T>(
+    v: &'a dyn WithVolatile,
+    script_name: &str,
+) -> PkmnResult<Option<&'a T>>
 where
     T: Script + 'static,
 {
-    let s = v.get_volatile_script(script_name);
+    let s = v.get_volatile_script(script_name)?;
     if let Some(s) = s {
-        Some(s.as_any().downcast_ref::<T>().unwrap())
+        Ok(Some(s.as_any().downcast_ref::<T>().unwrap()))
     } else {
-        None
+        Ok(None)
     }
 }

pkmn_lib_interface/src/app_interface/list.rs

@@ -1,204 +0,0 @@
-use alloc::rc::Rc;
-
-pub trait ImmutableListTrait<T> {
-    fn get(&self, index: u32) -> Option<T>;
-}
-
-pub type ImmutableList<T> = Rc<dyn ImmutableListTrait<T>>;
-
-#[cfg(not(feature = "mock_data"))]
-mod implementation {
-    use super::*;
-    use crate::app_interface::{
-        BattleParty, BattlePartyImpl, BattleSide, BattleSideImpl, EffectParameter, StringKey,
-    };
-    use crate::handling::extern_ref::{ExternalReferenceType, VecExternRef};
-    use alloc::boxed::Box;
-    use alloc::vec::Vec;
-    use core::marker::PhantomData;
-
-    pub(crate) struct ImmutableListInner<T: Clone> {
-        extern_ref: VecExternRef<T>,
-        resource_type: PhantomData<T>,
-        values: spin::RwLock<Vec<Option<Option<Rc<T>>>>>,
-    }
-
-    pub(crate) trait ImmutableListWasm<T: Clone + ExternalReferenceType> {
-        fn initialize(inner: *const ImmutableListInner<T>) -> Self
-        where
-            Self: Sized;
-
-        fn new(extern_ref: VecExternRef<T>) -> Self
-        where
-            Self: Sized,
-        {
-            let mut values = Vec::new();
-            values.resize(extern_ref.len() as usize, None);
-            let inner = Box::new(ImmutableListInner {
-                extern_ref,
-                resource_type: Default::default(),
-                values: spin::RwLock::new(values),
-            });
-            let inner_ptr = Box::into_raw(inner);
-            Self::initialize(inner_ptr)
-        }
-
-        fn from_ref(extern_ref: VecExternRef<T>) -> Self
-        where
-            Self: Sized,
-        {
-            unsafe {
-                if let None = CACHE {
-                    CACHE = Some(hashbrown::HashMap::new());
-                }
-                let existing = CACHE
-                    .as_ref()
-                    .unwrap()
-                    .get(&extern_ref.get_internal_index());
-                if let Some(v) = existing {
-                    let inner = *v as *const ImmutableListInner<T>;
-                    Self::initialize(inner)
-                } else {
-                    let v = Self::new(extern_ref);
-                    CACHE.as_mut().unwrap().insert(
-                        extern_ref.get_internal_index(),
-                        v.get_inner_ptr() as *const u8,
-                    );
-                    v
-                }
-            }
-        }
-
-        fn get_inner(&self) -> &ImmutableListInner<T> {
-            unsafe { self.get_inner_ptr().as_ref().unwrap() }
-        }
-        fn get_inner_ptr(&self) -> *const ImmutableListInner<T>;
-
-        fn get_cached(&self, index: u32) -> Option<Rc<T>> {
-            let inner = self.get_inner();
-            let rg = inner.values.read();
-            let v = rg.get(index as usize).unwrap();
-            if let Some(v) = v {
-                return v.clone();
-            }
-            return None;
-        }
-
-        fn get_value(&self, index: u32) -> Option<Rc<T>> {
-            if let Some(cached) = self.get_cached(index) {
-                return Some(cached);
-            }
-            let inner = self.get_inner();
-            let r = inner.extern_ref.at(index);
-            let value = r.get_value();
-            let value = if let Some(value) = value {
-                Some(Rc::new(value))
-            } else {
-                None
-            };
-            let mut wg = inner.values.write();
-            wg[index as usize] = Some(value);
-            let v = wg[index as usize].as_ref().unwrap().clone();
-            v
-        }
-    }
-
-    macro_rules! immutable_list_type {
-        ($type_name:ident, $underlying:ident) => {
-            paste::paste! {
-                pub struct [<$type_name ImmutableList>] {
-                    inner: *const ImmutableListInner<$underlying>,
-                }
-
-                impl ImmutableListWasm<$underlying> for [<$type_name ImmutableList>] {
-                    fn initialize(inner: *const ImmutableListInner<$underlying>) -> Self
-                    where
-                        Self: Sized,
-                    {
-                        Self { inner }
-                    }
-
-                    fn get_inner_ptr(&self) -> *const ImmutableListInner<$underlying> {
-                        self.inner
-                    }
-                }
-
-                impl ImmutableListTrait<$type_name> for [<$type_name ImmutableList>] {
-                    fn get(&self, index: u32) -> Option<$type_name> {
-                        let v = self.get_value(index);
-                        if let Some(v) = v {
-                            Some(v)
-                        } else {
-                            None
-                        }
-                    }
-                }
-            }
-        };
-    }
-
-    immutable_list_type!(BattleSide, BattleSideImpl);
-    immutable_list_type!(BattleParty, BattlePartyImpl);
-
-    pub struct EffectParameterImmutableList {
-        inner: *const ImmutableListInner<EffectParameter>,
-    }
-
-    impl ImmutableListWasm<EffectParameter> for EffectParameterImmutableList {
-        fn initialize(inner: *const ImmutableListInner<EffectParameter>) -> Self
-        where
-            Self: Sized,
-        {
-            Self { inner }
-        }
-
-        fn get_inner_ptr(&self) -> *const ImmutableListInner<EffectParameter> {
-            self.inner
-        }
-    }
-
-    impl ImmutableListTrait<Rc<EffectParameter>> for EffectParameterImmutableList {
-        fn get(&self, index: u32) -> Option<Rc<EffectParameter>> {
-            let v = self.get_value(index);
-            if let Some(v) = v {
-                Some(v)
-            } else {
-                None
-            }
-        }
-    }
-
-    #[derive(Clone)]
-    pub struct StringKeyImmutableList {
-        inner: *const ImmutableListInner<StringKey>,
-    }
-
-    impl ImmutableListWasm<StringKey> for StringKeyImmutableList {
-        fn initialize(inner: *const ImmutableListInner<StringKey>) -> Self
-        where
-            Self: Sized,
-        {
-            Self { inner }
-        }
-
-        fn get_inner_ptr(&self) -> *const ImmutableListInner<StringKey> {
-            self.inner
-        }
-    }
-
-    impl ImmutableListTrait<Rc<StringKey>> for StringKeyImmutableList {
-        fn get(&self, index: u32) -> Option<Rc<StringKey>> {
-            let v = self.get_value(index);
-            if let Some(v) = v {
-                Some(v)
-            } else {
-                None
-            }
-        }
-    }
-
-    static mut CACHE: Option<hashbrown::HashMap<u32, *const u8>> = None;
-}
-
-#[cfg(not(feature = "mock_data"))]
-pub use implementation::*;

pkmn_lib_interface/src/app_interface/mod.rs

@@ -1,5 +1,4 @@
 pub mod dynamic_data;
-pub mod list;
 pub mod static_data;
 pub mod string_key;
 

pkmn_lib_interface/src/app_interface/static_data/ability.rs

@@ -9,7 +9,7 @@ pub trait AbilityTrait {
 
 pub type Ability = Rc<dyn AbilityTrait>;
 
-#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Default)]
 #[repr(C)]
 pub struct AbilityIndex {
     pub hidden: bool,
@@ -19,21 +19,20 @@ pub struct AbilityIndex {
 #[cfg(not(feature = "mock_data"))]
 mod implementation {
     use super::*;
-    use crate::app_interface::list::{
-        EffectParameterImmutableList, ImmutableList, ImmutableListWasm,
-    };
     use crate::app_interface::{EffectParameter, StringKey};
     use crate::handling::cached_value::CachedValue;
-    use crate::handling::extern_ref::{ExternRef, ExternalReferenceType, VecExternRef};
+    use crate::handling::extern_ref::{ExternRef, ExternalReferenceType};
-    use crate::handling::Cacheable;
+    use crate::handling::ffi_array::FFIArray;
+    use crate::handling::{Cacheable, WasmResult};
     use crate::{cached_value, cached_value_getters};
     use alloc::rc::Rc;
+    use alloc::vec::Vec;
 
     struct AbilityInner {
         reference: ExternRef<AbilityImpl>,
         name: CachedValue<StringKey>,
         effect: CachedValue<StringKey>,
-        parameters: CachedValue<ImmutableList<Rc<EffectParameter>>>,
+        parameters: CachedValue<Vec<Rc<EffectParameter>>>,
     }
 
     #[derive(Clone)]
@@ -47,12 +46,21 @@ mod implementation {
             Self::from_ref(reference, &|reference| Self {
                 inner: Rc::new(AbilityInner {
                     reference,
-                    name: cached_value!({ ability_get_name(reference).get_value().unwrap() }),
+                    name: cached_value!({
-                    effect: cached_value!({ ability_get_effect(reference).get_value().unwrap() }),
+                        ability_get_name(reference).unwrap().get_value().unwrap()
+                    }),
+                    effect: cached_value!({
+                        ability_get_effect(reference).unwrap().get_value().unwrap()
+                    }),
                     parameters: cached_value!({
-                        Rc::new(EffectParameterImmutableList::from_ref(
+                        let pars: FFIArray<ExternRef<EffectParameter>> =
-                            ability_get_parameters(reference),
+                            FFIArray::from_u64(ability_get_parameters(reference).unwrap());
-                        ))
+                        let pars = Vec::from_raw_parts(pars.ptr(), pars.len(), pars.len());
+                        let pars = pars
+                            .into_iter()
+                            .map(|r| Rc::new(EffectParameter::new(r).unwrap()))
+                            .collect::<Vec<_>>();
+                        pars
                     }),
                 }),
             })
@@ -77,9 +85,9 @@ mod implementation {
 
     #[cfg(not(feature = "mock_data"))]
     extern "wasm" {
-        fn ability_get_name(r: ExternRef<AbilityImpl>) -> ExternRef<StringKey>;
+        fn ability_get_name(r: ExternRef<AbilityImpl>) -> WasmResult<ExternRef<StringKey>>;
-        fn ability_get_effect(r: ExternRef<AbilityImpl>) -> ExternRef<StringKey>;
+        fn ability_get_effect(r: ExternRef<AbilityImpl>) -> WasmResult<ExternRef<StringKey>>;
-        fn ability_get_parameters(r: ExternRef<AbilityImpl>) -> VecExternRef<EffectParameter>;
+        fn ability_get_parameters(r: ExternRef<AbilityImpl>) -> WasmResult<u64>;
     }
 }
 

pkmn_lib_interface/src/app_interface/static_data/data_libraries/mod.rs

@@ -35,7 +35,7 @@ mod implementation {
     use crate::app_interface::{get_hash, StringKey};
     use crate::handling::cached_value::CachedValue;
     use crate::handling::extern_ref::{ExternRef, ExternalReferenceType};
-    use crate::handling::Cacheable;
+    use crate::handling::{Cacheable, WasmResult};
     use crate::{cached_value, cached_value_getters};
     use spin::RwLock;
 
@@ -60,24 +60,41 @@ mod implementation {
                 inner: Rc::new(StaticDataInner {
                     reference,
                     move_library: cached_value!({
-                        Rc::new(static_data_get_move_library(reference).get_value().unwrap())
+                        Rc::new(
+                            static_data_get_move_library(reference)
+                                .unwrap()
+                                .get_value()
+                                .unwrap(),
+                        )
                     }),
                     item_library: cached_value!({
-                        Rc::new(static_data_get_item_library(reference).get_value().unwrap())
+                        Rc::new(
+                            static_data_get_item_library(reference)
+                                .unwrap()
+                                .get_value()
+                                .unwrap(),
+                        )
                     }),
                     species_library: cached_value!({
                         Rc::new(
                             static_data_get_species_library(reference)
+                                .unwrap()
                                 .get_value()
                                 .unwrap(),
                         )
                     }),
                     type_library: cached_value!({
-                        Rc::new(static_data_get_type_library(reference).get_value().unwrap())
+                        Rc::new(
+                            static_data_get_type_library(reference)
+                                .unwrap()
+                                .get_value()
+                                .unwrap(),
+                        )
                     }),
                     settings: cached_value!({
                         Rc::new(
                             static_data_get_library_settings(reference)
+                                .unwrap()
                                 .get_value()
                                 .unwrap(),
                         )
@@ -119,7 +136,9 @@ mod implementation {
         pub(crate) fn new(ptr: ExternRef<LibrarySettingsImpl>) -> Self {
             Self {
                 inner: Rc::new(LibrarySettingsInner {
-                    maximum_level: cached_value!({ library_settings_get_maximum_level(ptr) }),
+                    maximum_level: cached_value!({
+                        library_settings_get_maximum_level(ptr).unwrap()
+                    }),
                 }),
             }
         }
@@ -142,21 +161,23 @@ mod implementation {
     extern "wasm" {
         fn static_data_get_move_library(
             ptr: ExternRef<StaticDataImpl>,
-        ) -> ExternRef<MoveLibraryImpl>;
+        ) -> WasmResult<ExternRef<MoveLibraryImpl>>;
         fn static_data_get_item_library(
             ptr: ExternRef<StaticDataImpl>,
-        ) -> ExternRef<ItemLibraryImpl>;
+        ) -> WasmResult<ExternRef<ItemLibraryImpl>>;
         fn static_data_get_species_library(
             ptr: ExternRef<StaticDataImpl>,
-        ) -> ExternRef<SpeciesLibraryImpl>;
+        ) -> WasmResult<ExternRef<SpeciesLibraryImpl>>;
         fn static_data_get_type_library(
             ptr: ExternRef<StaticDataImpl>,
-        ) -> ExternRef<TypeLibraryImpl>;
+        ) -> WasmResult<ExternRef<TypeLibraryImpl>>;
         fn static_data_get_library_settings(
             ptr: ExternRef<StaticDataImpl>,
-        ) -> ExternRef<LibrarySettingsImpl>;
+        ) -> WasmResult<ExternRef<LibrarySettingsImpl>>;
 
-        fn library_settings_get_maximum_level(ptr: ExternRef<LibrarySettingsImpl>) -> LevelInt;
+        fn library_settings_get_maximum_level(
+            ptr: ExternRef<LibrarySettingsImpl>,
+        ) -> WasmResult<LevelInt>;
     }
 
     pub trait DataLibrary<T>: Cacheable
@@ -182,14 +203,16 @@ mod implementation {
         where
             Self: Sized,
         {
-            if let Some(v) = self.get_cache().read().get(&name.hash()) {
+            if let Some(v) = self.get_cache().read().get(&name.hash().unwrap()) {
                 return Some(v.clone());
             }
 
             let index = Self::_get_ref_by_name(self.get_self_ref(), name.ptr());
             let v = Self::_from_external_ref_index(index);
             if let Some(v) = &v {
-                self.get_cache().write().insert(name.hash(), v.clone());
+                self.get_cache()
+                    .write()
+                    .insert(name.hash().unwrap(), v.clone());
             }
             v
         }
@@ -242,7 +265,7 @@ mod mocked {
         where
             Self: Sized,
         {
-            self.get_cache().read().get(&name.hash()).cloned()
+            self.get_cache().read().get(&name.hash().unwrap()).cloned()
         }
 
         fn get_by_hash(&self, hash: u32) -> Option<T>

pkmn_lib_interface/src/app_interface/static_data/data_libraries/type_library.rs

@@ -2,17 +2,17 @@ use crate::app_interface::TypeIdentifier;
 use alloc::rc::Rc;
 
 pub trait TypeLibraryTrait {
-    fn get_type_from_name(&self, name: &str) -> Option<TypeIdentifier>;
+    fn get_type_from_name(&self, name: &str) -> PkmnResult<Option<TypeIdentifier>>;
     fn get_single_effectiveness(
         &self,
         attacking_type: TypeIdentifier,
         defending_type: TypeIdentifier,
-    ) -> f32;
+    ) -> PkmnResult<f32>;
     fn get_effectiveness(
         &self,
         attacking_type: TypeIdentifier,
         defending_types: &[TypeIdentifier],
-    ) -> f32;
+    ) -> PkmnResult<f32>;
 }
 
 pub type Typelibrary = Rc<dyn TypeLibraryTrait>;
@@ -21,6 +21,8 @@ pub type Typelibrary = Rc<dyn TypeLibraryTrait>;
 mod implementation {
     use super::*;
     use crate::handling::extern_ref::{ExternRef, ExternalReferenceType};
+    use crate::handling::WasmResult;
+    use crate::PkmnResult;
     use alloc::rc::Rc;
     use alloc::string::{String, ToString};
     use cstr_core::{c_char, CString};
@@ -51,35 +53,37 @@ mod implementation {
     }
 
     impl TypeLibraryTrait for TypeLibraryImpl {
-        fn get_type_from_name(&self, name: &str) -> Option<TypeIdentifier> {
+        fn get_type_from_name(&self, name: &str) -> PkmnResult<Option<TypeIdentifier>> {
             if let Some(cached) = self.inner.name_to_type_cache.read().get(name) {
-                return Some(*cached);
+                return Ok(Some(*cached));
             }
             let cstr = CString::new(name).unwrap();
-            let v = unsafe { type_library_get_type_by_name(self.inner.reference, cstr.as_ptr()) };
+            let v = unsafe {
+                type_library_get_type_by_name(self.inner.reference, cstr.as_ptr()).as_res()?
+            };
             if v == 255 {
-                return None;
+                return Ok(None);
             }
             let v = v.into();
             self.inner
                 .name_to_type_cache
                 .write()
                 .insert(name.to_string(), v);
-            Some(v)
+            Ok(Some(v))
         }
 
         fn get_single_effectiveness(
             &self,
             attacking_type: TypeIdentifier,
             defending_type: TypeIdentifier,
-        ) -> f32 {
+        ) -> PkmnResult<f32> {
             if let Some(cached) = self
                 .inner
                 .effectiveness_cache
                 .read()
                 .get(&(attacking_type, defending_type))
             {
-                return *cached;
+                return Ok(*cached);
             }
             let effectiveness = unsafe {
                 type_library_get_single_effectiveness(
@@ -87,24 +91,25 @@ mod implementation {
                     attacking_type.into(),
                     defending_type.into(),
                 )
-            };
+            }
+            .as_res()?;
             self.inner
                 .effectiveness_cache
                 .write()
                 .insert((attacking_type, defending_type), effectiveness);
-            effectiveness
+            Ok(effectiveness)
         }
 
         fn get_effectiveness(
             &self,
             attacking_type: TypeIdentifier,
             defending_types: &[TypeIdentifier],
-        ) -> f32 {
+        ) -> PkmnResult<f32> {
             let mut f = 1.0;
             for defending_type in defending_types {
-                f *= self.get_single_effectiveness(attacking_type, *defending_type);
+                f *= self.get_single_effectiveness(attacking_type, *defending_type)?;
             }
-            f
+            Ok(f)
         }
     }
 
@@ -123,10 +128,14 @@ mod implementation {
             r: ExternRef<TypeLibraryImpl>,
             attacking_type: u8,
             defending_type: u8,
-        ) -> f32;
+        ) -> WasmResult<f32>;
-        fn type_library_get_type_by_name(r: ExternRef<TypeLibraryImpl>, name: *const c_char) -> u8;
+        fn type_library_get_type_by_name(
+            r: ExternRef<TypeLibraryImpl>,
+            name: *const c_char,
+        ) -> WasmResult<u8>;
     }
 }
 
+use crate::PkmnResult;
 #[cfg(not(feature = "mock_data"))]
 pub use implementation::*;

pkmn_lib_interface/src/app_interface/static_data/effect_parameter.rs

@@ -1,9 +1,10 @@
 use crate::app_interface::StringKey;
 #[cfg(not(feature = "mock_data"))]
-use crate::{ExternRef, ExternalReferenceType};
+use crate::{handling::WasmResult, ExternRef, ExternalReferenceType, PkmnResult};
 use core::fmt::{Display, Formatter};
 
 #[repr(u8)]
+#[derive(Copy, Clone)]
 enum EffectParameterType {
     None,
     Bool,
@@ -12,6 +13,12 @@ enum EffectParameterType {
     String,
 }
 
+impl Default for EffectParameterType {
+    fn default() -> Self {
+        Self::None
+    }
+}
+
 #[derive(Clone)]
 pub enum EffectParameter {
     None,
@@ -23,18 +30,18 @@ pub enum EffectParameter {
 
 impl EffectParameter {
     #[cfg(not(feature = "mock_data"))]
-    pub(crate) fn new(ptr: ExternRef<Self>) -> Self {
+    pub(crate) fn new(ptr: ExternRef<Self>) -> PkmnResult<Self> {
-        unsafe {
+        Ok(unsafe {
-            match effect_parameter_get_type(ptr) {
+            match effect_parameter_get_type(ptr).as_res()? {
                 EffectParameterType::None => Self::None,
-                EffectParameterType::Bool => Self::Bool(effect_parameter_as_bool(ptr)),
+                EffectParameterType::Bool => Self::Bool(effect_parameter_as_bool(ptr).as_res()?),
-                EffectParameterType::Int => Self::Int(effect_parameter_as_int(ptr)),
+                EffectParameterType::Int => Self::Int(effect_parameter_as_int(ptr).as_res()?),
-                EffectParameterType::Float => Self::Float(effect_parameter_as_float(ptr)),
+                EffectParameterType::Float => Self::Float(effect_parameter_as_float(ptr).as_res()?),
                 EffectParameterType::String => {
-                    Self::String(StringKey::new(effect_parameter_as_string(ptr)))
+                    Self::String(StringKey::new(effect_parameter_as_string(ptr).as_res()?))
                 }
             }
-        }
+        })
     }
 
     pub fn as_bool(&self) -> bool {
@@ -72,7 +79,7 @@ impl ExternalReferenceType for EffectParameter {
     where
         Self: Sized,
     {
-        EffectParameter::new(reference)
+        EffectParameter::new(reference).unwrap()
     }
 }
 
@@ -92,9 +99,13 @@ impl Display for EffectParameter {
 
 #[cfg(not(feature = "mock_data"))]
 extern "wasm" {
-    fn effect_parameter_get_type(ptr: ExternRef<EffectParameter>) -> EffectParameterType;
+    fn effect_parameter_get_type(
-    fn effect_parameter_as_bool(ptr: ExternRef<EffectParameter>) -> bool;
+        ptr: ExternRef<EffectParameter>,
-    fn effect_parameter_as_int(ptr: ExternRef<EffectParameter>) -> i64;
+    ) -> WasmResult<EffectParameterType>;
-    fn effect_parameter_as_float(ptr: ExternRef<EffectParameter>) -> f32;
+    fn effect_parameter_as_bool(ptr: ExternRef<EffectParameter>) -> WasmResult<bool>;
-    fn effect_parameter_as_string(ptr: ExternRef<EffectParameter>) -> ExternRef<StringKey>;
+    fn effect_parameter_as_int(ptr: ExternRef<EffectParameter>) -> WasmResult<i64>;
+    fn effect_parameter_as_float(ptr: ExternRef<EffectParameter>) -> WasmResult<f32>;
+    fn effect_parameter_as_string(
+        ptr: ExternRef<EffectParameter>,
+    ) -> WasmResult<ExternRef<StringKey>>;
 }

pkmn_lib_interface/src/app_interface/static_data/item.rs

@@ -23,6 +23,12 @@ pub enum ItemCategory {
     Mail,
 }
 
+impl Default for ItemCategory {
+    fn default() -> Self {
+        Self::MiscItem
+    }
+}
+
 /// A battle item category defines how the item is categorized when in battle.
 #[repr(u8)]
 #[derive(Clone)]
@@ -39,6 +45,12 @@ pub enum BattleItemCategory {
     MiscBattleItem,
 }
 
+impl Default for BattleItemCategory {
+    fn default() -> Self {
+        Self::None
+    }
+}
+
 #[cfg_attr(feature = "mock_data", mockall::automock)]
 pub trait ItemTrait {
     fn reference(&self) -> u32;
@@ -50,7 +62,7 @@ pub trait ItemTrait {
     fn battle_category(&self) -> BattleItemCategory;
     /// The buying value of the item.
     fn price(&self) -> i32;
-    fn has_flag(&self, flag: &StringKey) -> bool;
+    fn has_flag(&self, flag: &StringKey) -> PkmnResult<bool>;
 }
 
 pub type Item = Rc<dyn ItemTrait>;
@@ -62,8 +74,8 @@ mod implementation {
     use crate::app_interface::{BattleItemCategory, ItemCategory, ItemTrait, StringKey};
     use crate::handling::cached_value::CachedValue;
     use crate::handling::extern_ref::{ExternRef, ExternalReferenceType};
-    use crate::handling::Cacheable;
+    use crate::handling::{Cacheable, WasmResult};
-    use crate::{cached_value, cached_value_getters};
+    use crate::{cached_value, cached_value_getters, PkmnResult};
     use alloc::rc::Rc;
 
     struct ItemInner {
@@ -86,10 +98,12 @@ mod implementation {
             Self::from_ref(reference, &|reference| Self {
                 inner: Rc::new(ItemInner {
                     reference,
-                    name: cached_value!({ StringKey::new(item_get_name(reference)) }),
+                    name: cached_value!({ StringKey::new(item_get_name(reference).unwrap()) }),
-                    category: cached_value!({ item_get_category(reference) }),
+                    category: cached_value!({ item_get_category(reference).unwrap() }),
-                    battle_category: cached_value!({ item_get_battle_category(reference) }),
+                    battle_category: cached_value!({
-                    price: cached_value!({ item_get_price(reference) }),
+                        item_get_battle_category(reference).unwrap()
+                    }),
+                    price: cached_value!({ item_get_price(reference).unwrap() }),
                 }),
             })
         }
@@ -116,8 +130,8 @@ mod implementation {
             fn price(&self) -> i32;
         }
 
-        fn has_flag(&self, flag: &StringKey) -> bool {
+        fn has_flag(&self, flag: &StringKey) -> PkmnResult<bool> {
-            unsafe { item_has_flag(self.inner.reference, flag.ptr()) }
+            unsafe { item_has_flag(self.inner.reference, flag.ptr()).as_res() }
         }
     }
 
@@ -131,13 +145,14 @@ mod implementation {
     }
 
     extern "wasm" {
-        fn item_get_name(ptr: ExternRef<ItemImpl>) -> ExternRef<StringKey>;
+        fn item_get_name(ptr: ExternRef<ItemImpl>) -> WasmResult<ExternRef<StringKey>>;
-        fn item_get_category(ptr: ExternRef<ItemImpl>) -> ItemCategory;
+        fn item_get_category(ptr: ExternRef<ItemImpl>) -> WasmResult<ItemCategory>;
-        fn item_get_battle_category(ptr: ExternRef<ItemImpl>) -> BattleItemCategory;
+        fn item_get_battle_category(ptr: ExternRef<ItemImpl>) -> WasmResult<BattleItemCategory>;
-        fn item_get_price(ptr: ExternRef<ItemImpl>) -> i32;
+        fn item_get_price(ptr: ExternRef<ItemImpl>) -> WasmResult<i32>;
-        fn item_has_flag(ptr: ExternRef<ItemImpl>, flag: ExternRef<StringKey>) -> bool;
+        fn item_has_flag(ptr: ExternRef<ItemImpl>, flag: ExternRef<StringKey>) -> WasmResult<bool>;
     }
 }
 
+use crate::PkmnResult;
 #[cfg(not(feature = "mock_data"))]
 pub use implementation::*;

pkmn_lib_interface/src/app_interface/static_data/move_data.rs

@@ -9,6 +9,12 @@ pub enum MoveCategory {
     Status = 2,
 }
 
+impl Default for MoveCategory {
+    fn default() -> Self {
+        Self::Physical
+    }
+}
+
 #[repr(u8)]
 #[derive(Clone, Eq, PartialEq)]
 pub enum MoveTarget {
@@ -29,6 +35,12 @@ pub enum MoveTarget {
     OnSelf,
 }
 
+impl Default for MoveTarget {
+    fn default() -> Self {
+        Self::Adjacent
+    }
+}
+
 #[cfg_attr(feature = "mock_data", mockall::automock)]
 pub trait MoveDataTrait {
     fn name(&self) -> StringKey;
@@ -39,7 +51,7 @@ pub trait MoveDataTrait {
     fn base_usages(&self) -> u8;
     fn target(&self) -> MoveTarget;
     fn priority(&self) -> i8;
-    fn has_flag(&self, flag: &str) -> bool;
+    fn has_flag(&self, flag: &str) -> PkmnResult<bool>;
 }
 
 pub type MoveData = Rc<dyn MoveDataTrait>;
@@ -52,8 +64,8 @@ mod implementation {
     use crate::app_interface::get_hash;
     use crate::handling::cached_value::CachedValue;
     use crate::handling::extern_ref::{ExternRef, ExternalReferenceType};
-    use crate::handling::Cacheable;
+    use crate::handling::{Cacheable, WasmResult};
-    use crate::{cached_value, cached_value_getters};
+    use crate::{cached_value, cached_value_getters, PkmnResult};
 
     struct MoveDataInner {
         ptr: ExternRef<MoveDataImpl>,
@@ -77,14 +89,14 @@ mod implementation {
             MoveDataImpl::from_ref(ptr, &|ptr| Self {
                 inner: Rc::new(MoveDataInner {
                     ptr,
-                    name: cached_value!({ StringKey::new(move_data_get_name(ptr)) }),
+                    name: cached_value!({ StringKey::new(move_data_get_name(ptr).unwrap()) }),
-                    move_type: cached_value!({ move_data_get_type(ptr) }),
+                    move_type: cached_value!({ move_data_get_type(ptr).unwrap() }),
-                    category: cached_value!({ move_data_get_category(ptr) }),
+                    category: cached_value!({ move_data_get_category(ptr).unwrap() }),
-                    base_power: cached_value!({ move_data_get_base_power(ptr) }),
+                    base_power: cached_value!({ move_data_get_base_power(ptr).unwrap() }),
-                    accuracy: cached_value!({ move_data_get_accuracy(ptr) }),
+                    accuracy: cached_value!({ move_data_get_accuracy(ptr).unwrap() }),
-                    base_usages: cached_value!({ move_data_get_base_power(ptr) }),
+                    base_usages: cached_value!({ move_data_get_base_power(ptr).unwrap() }),
-                    target: cached_value!({ move_data_get_target(ptr) }),
+                    target: cached_value!({ move_data_get_target(ptr).unwrap() }),
-                    priority: cached_value!({ move_data_get_priority(ptr) }),
+                    priority: cached_value!({ move_data_get_priority(ptr).unwrap() }),
                 }),
             })
         }
@@ -102,9 +114,9 @@ mod implementation {
             fn priority(&self) -> i8;
         }
 
-        fn has_flag(&self, flag: &str) -> bool {
+        fn has_flag(&self, flag: &str) -> PkmnResult<bool> {
             let hash = get_hash(flag);
-            unsafe { move_data_has_flag_by_hash(self.inner.ptr, hash) }
+            unsafe { move_data_has_flag_by_hash(self.inner.ptr, hash).as_res() }
         }
     }
 
@@ -117,17 +129,21 @@ mod implementation {
     crate::handling::cacheable::cacheable!(MoveDataImpl);
 
     extern "wasm" {
-        fn move_data_get_name(ptr: ExternRef<MoveDataImpl>) -> ExternRef<StringKey>;
+        fn move_data_get_name(ptr: ExternRef<MoveDataImpl>) -> WasmResult<ExternRef<StringKey>>;
-        fn move_data_get_type(ptr: ExternRef<MoveDataImpl>) -> u8;
+        fn move_data_get_type(ptr: ExternRef<MoveDataImpl>) -> WasmResult<u8>;
-        fn move_data_get_category(ptr: ExternRef<MoveDataImpl>) -> MoveCategory;
+        fn move_data_get_category(ptr: ExternRef<MoveDataImpl>) -> WasmResult<MoveCategory>;
-        fn move_data_get_base_power(ptr: ExternRef<MoveDataImpl>) -> u8;
+        fn move_data_get_base_power(ptr: ExternRef<MoveDataImpl>) -> WasmResult<u8>;
-        fn move_data_get_accuracy(ptr: ExternRef<MoveDataImpl>) -> u8;
+        fn move_data_get_accuracy(ptr: ExternRef<MoveDataImpl>) -> WasmResult<u8>;
-        fn move_data_get_base_usages(ptr: ExternRef<MoveDataImpl>) -> u8;
+        fn move_data_get_base_usages(ptr: ExternRef<MoveDataImpl>) -> WasmResult<u8>;
-        fn move_data_get_target(ptr: ExternRef<MoveDataImpl>) -> MoveTarget;
+        fn move_data_get_target(ptr: ExternRef<MoveDataImpl>) -> WasmResult<MoveTarget>;
-        fn move_data_get_priority(ptr: ExternRef<MoveDataImpl>) -> i8;
+        fn move_data_get_priority(ptr: ExternRef<MoveDataImpl>) -> WasmResult<i8>;
-        fn move_data_has_flag_by_hash(ptr: ExternRef<MoveDataImpl>, flag_hash: u32) -> bool;
+        fn move_data_has_flag_by_hash(
+            ptr: ExternRef<MoveDataImpl>,
+            flag_hash: u32,
+        ) -> WasmResult<bool>;
     }
 }
 
+use crate::PkmnResult;
 #[cfg(not(feature = "mock_data"))]
 pub use implementation::*;

pkmn_lib_interface/src/app_interface/static_data/nature.rs

@@ -14,7 +14,7 @@ pub type Nature = Rc<dyn NatureTrait>;
 mod implementation {
     use super::*;
     use crate::handling::extern_ref::{ExternRef, ExternalReferenceType};
-    use crate::handling::Cacheable;
+    use crate::handling::{Cacheable, WasmResult};
 
     struct NatureInner {
         reference: ExternRef<NatureImpl>,
@@ -41,10 +41,10 @@ mod implementation {
                 Self {
                     inner: Rc::new(NatureInner {
                         reference,
-                        increase_stat: nature_get_increase_stat(reference),
+                        increase_stat: nature_get_increase_stat(reference).unwrap(),
-                        decrease_stat: nature_get_decrease_stat(reference),
+                        decrease_stat: nature_get_decrease_stat(reference).unwrap(),
-                        increase_modifier: nature_get_increase_modifier(reference),
+                        increase_modifier: nature_get_increase_modifier(reference).unwrap(),
-                        decrease_modifier: nature_get_decrease_modifier(reference),
+                        decrease_modifier: nature_get_decrease_modifier(reference).unwrap(),
                     }),
                 }
             })
@@ -76,10 +76,10 @@ mod implementation {
     }
 
     extern "wasm" {
-        fn nature_get_increase_stat(r: ExternRef<NatureImpl>) -> Statistic;
+        fn nature_get_increase_stat(r: ExternRef<NatureImpl>) -> WasmResult<Statistic>;
-        fn nature_get_decrease_stat(r: ExternRef<NatureImpl>) -> Statistic;
+        fn nature_get_decrease_stat(r: ExternRef<NatureImpl>) -> WasmResult<Statistic>;
-        fn nature_get_increase_modifier(r: ExternRef<NatureImpl>) -> f32;
+        fn nature_get_increase_modifier(r: ExternRef<NatureImpl>) -> WasmResult<f32>;
-        fn nature_get_decrease_modifier(r: ExternRef<NatureImpl>) -> f32;
+        fn nature_get_decrease_modifier(r: ExternRef<NatureImpl>) -> WasmResult<f32>;
     }
 }
 

pkmn_lib_interface/src/app_interface/static_data/species.rs

@@ -1,27 +1,32 @@
-use crate::app_interface::list::ImmutableList;
 use crate::app_interface::{ImmutableStatisticSet, StringKey};
 use alloc::rc::Rc;
 use alloc::vec::Vec;
 use core::any::Any;
 
 #[repr(u8)]
-#[derive(Eq, PartialEq, Debug)]
+#[derive(Eq, PartialEq, Debug, Copy, Clone)]
 pub enum Gender {
     Male = 0,
     Female = 1,
     Genderless = 2,
 }
 
+impl Default for Gender {
+    fn default() -> Self {
+        Self::Genderless
+    }
+}
+
 pub trait FormTrait {
     fn name(&self) -> StringKey;
     fn height(&self) -> f32;
     fn weight(&self) -> f32;
     fn base_experience(&self) -> u32;
     fn base_stats(&self) -> ImmutableStatisticSet;
-    fn abilities(&self) -> ImmutableList<Rc<StringKey>>;
+    fn abilities(&self) -> Vec<Rc<StringKey>>;
-    fn hidden_abilities(&self) -> ImmutableList<Rc<StringKey>>;
+    fn hidden_abilities(&self) -> Vec<Rc<StringKey>>;
     fn types(&self) -> &Vec<u8>;
-    fn has_flag(&self, flag: &str) -> bool;
+    fn has_flag(&self, flag: &str) -> PkmnResult<bool>;
 
     fn as_any(&self) -> &dyn Any;
 }
@@ -39,7 +44,7 @@ pub trait SpeciesTrait {
     /// uncatchable.
     fn capture_rate(&self) -> u8;
     fn get_form(&self, form_name: &str) -> Option<Form>;
-    fn has_flag(&self, flag: &str) -> bool;
+    fn has_flag(&self, flag: &str) -> PkmnResult<bool>;
 
     fn as_any(&self) -> &dyn Any;
 }
@@ -50,13 +55,13 @@ pub type Species = Rc<dyn SpeciesTrait>;
 #[cfg(not(feature = "mock_data"))]
 mod implementation {
     use super::*;
-    use crate::app_interface::list::ImmutableListWasm;
     use crate::app_interface::{get_hash, ImmutableStatisticSetImpl};
     use crate::handling::cached_value::CachedValue;
-    use crate::handling::extern_ref::{ExternRef, ExternalReferenceType, VecExternRef};
+    use crate::handling::extern_ref::{ExternRef, ExternalReferenceType};
     use crate::handling::ffi_array::FFIArray;
+    use crate::handling::wasm_result::WasmResult;
     use crate::handling::Cacheable;
-    use crate::{cached_value, cached_value_getters};
+    use crate::{cached_value, cached_value_getters, PkmnResult};
     use spin::RwLock;
 
     struct FormInner {
@@ -67,8 +72,8 @@ mod implementation {
         types: CachedValue<Vec<u8>>,
         base_experience: CachedValue<u32>,
         base_stats: CachedValue<ImmutableStatisticSet>,
-        abilities: CachedValue<ImmutableList<Rc<StringKey>>>,
+        abilities: CachedValue<Vec<Rc<StringKey>>>,
-        hidden_abilities: CachedValue<ImmutableList<Rc<StringKey>>>,
+        hidden_abilities: CachedValue<Vec<Rc<StringKey>>>,
         // moves: CachedValue<LearnableMoves>,
     }
 
@@ -82,30 +87,38 @@ mod implementation {
             Self::from_ref(reference, &|reference| Self {
                 inner: Rc::new(FormInner {
                     reference,
-                    name: cached_value!({ form_get_name(reference).get_value().unwrap() }),
+                    name: cached_value!({ form_get_name(reference).unwrap().get_value().unwrap() }),
-                    height: cached_value!({ form_get_height(reference) }),
+                    height: cached_value!({ form_get_height(reference).unwrap() }),
-                    weight: cached_value!({ form_get_weight(reference) }),
+                    weight: cached_value!({ form_get_weight(reference).unwrap() }),
                     types: cached_value!({
-                        let raw = form_get_types(reference);
+                        let raw = FFIArray::from_u64(form_get_types(reference).unwrap());
                         Vec::from_raw_parts(raw.ptr(), raw.len(), raw.len())
                     }),
-                    base_experience: cached_value!({ form_get_base_experience(reference) }),
+                    base_experience: cached_value!({
+                        form_get_base_experience(reference).unwrap()
+                    }),
                     base_stats: cached_value!({
-                        Rc::new(form_get_base_stats(reference).get_value().unwrap())
+                        Rc::new(form_get_base_stats(reference).unwrap().get_value().unwrap())
                     }),
                     abilities: cached_value!({
-                        Rc::new(
+                        let abilities: FFIArray<ExternRef<StringKey>> =
-                            crate::app_interface::list::StringKeyImmutableList::from_ref(
+                            FFIArray::from_u64(form_get_abilities(reference).unwrap());
-                                form_get_abilities(reference),
+                        let abilities =
-                            ),
+                            Vec::from_raw_parts(abilities.ptr(), abilities.len(), abilities.len());
-                        )
+                        abilities
+                            .into_iter()
+                            .map::<Rc<StringKey>, _>(|r| Rc::new(StringKey::new(r)))
+                            .collect()
                     }),
                     hidden_abilities: cached_value!({
-                        Rc::new(
+                        let abilities: FFIArray<ExternRef<StringKey>> =
-                            crate::app_interface::list::StringKeyImmutableList::from_ref(
+                            FFIArray::from_u64(form_get_hidden_abilities(reference).unwrap());
-                                form_get_hidden_abilities(reference),
+                        let abilities =
-                            ),
+                            Vec::from_raw_parts(abilities.ptr(), abilities.len(), abilities.len());
-                        )
+                        abilities
+                            .into_iter()
+                            .map::<Rc<StringKey>, _>(|r| Rc::new(StringKey::new(r)))
+                            .collect()
                     }),
                 }),
             })
@@ -123,16 +136,16 @@ mod implementation {
             fn weight(&self) -> f32;
             fn base_experience(&self) -> u32;
             fn base_stats(&self) -> ImmutableStatisticSet;
-            fn abilities(&self) -> ImmutableList<Rc<StringKey>>;
+            fn abilities(&self) -> Vec<Rc<StringKey>>;
-            fn hidden_abilities(&self) -> ImmutableList<Rc<StringKey>>;
+            fn hidden_abilities(&self) -> Vec<Rc<StringKey>>;
         }
         fn types(&self) -> &Vec<u8> {
             self.inner.types.value_ref()
         }
 
-        fn has_flag(&self, flag: &str) -> bool {
+        fn has_flag(&self, flag: &str) -> PkmnResult<bool> {
             let hash = get_hash(flag);
-            unsafe { form_has_flag_by_hash(self.inner.reference, hash) }
+            unsafe { form_has_flag_by_hash(self.inner.reference, hash).as_res() }
         }
 
         fn as_any(&self) -> &dyn Any {
@@ -160,13 +173,18 @@ mod implementation {
             Self {
                 inner: Rc::new(SpeciesInner {
                     reference,
-                    id: cached_value!({ species_get_id(reference) }),
+                    id: cached_value!({ species_get_id(reference).unwrap() }),
-                    name: cached_value!({ species_get_name(reference).get_value().unwrap() }),
+                    name: cached_value!({
-                    gender_rate: cached_value!({ species_get_gender_rate(reference) }),
+                        species_get_name(reference).unwrap().get_value().unwrap()
-                    growth_rate: cached_value!({
-                        species_get_growth_rate(reference).get_value().unwrap()
                     }),
-                    capture_rate: cached_value!({ species_get_capture_rate(reference) }),
+                    gender_rate: cached_value!({ species_get_gender_rate(reference).unwrap() }),
+                    growth_rate: cached_value!({
+                        species_get_growth_rate(reference)
+                            .unwrap()
+                            .get_value()
+                            .unwrap()
+                    }),
+                    capture_rate: cached_value!({ species_get_capture_rate(reference).unwrap() }),
                     forms: Default::default(),
                 }),
             }
@@ -198,7 +216,7 @@ mod implementation {
                 if let Some(v) = self.inner.forms.read().get(&hash) {
                     v.clone()
                 } else {
-                    let r = species_get_form_by_hash(self.inner.reference, hash);
+                    let r = species_get_form_by_hash(self.inner.reference, hash).unwrap();
                     let value = r.get_value();
                     let value: Option<Form> = if let Some(value) = value {
                         Some(Rc::new(value))
@@ -211,9 +229,9 @@ mod implementation {
             }
         }
 
-        fn has_flag(&self, flag: &str) -> bool {
+        fn has_flag(&self, flag: &str) -> PkmnResult<bool> {
             let hash = get_hash(flag);
-            unsafe { species_has_flag_by_hash(self.inner.reference, hash) }
+            unsafe { species_has_flag_by_hash(self.inner.reference, hash).as_res() }
         }
 
         fn as_any(&self) -> &dyn Any {
@@ -237,25 +255,31 @@ mod implementation {
     crate::handling::cacheable::cacheable!(SpeciesImpl);
 
     extern "wasm" {
-        fn form_get_name(r: ExternRef<FormImpl>) -> ExternRef<StringKey>;
+        fn form_get_name(r: ExternRef<FormImpl>) -> WasmResult<ExternRef<StringKey>>;
-        fn form_get_height(r: ExternRef<FormImpl>) -> f32;
+        fn form_get_height(r: ExternRef<FormImpl>) -> WasmResult<f32>;
-        fn form_get_weight(r: ExternRef<FormImpl>) -> f32;
+        fn form_get_weight(r: ExternRef<FormImpl>) -> WasmResult<f32>;
-        fn form_get_types(r: ExternRef<FormImpl>) -> FFIArray<u8>;
+        fn form_get_types(r: ExternRef<FormImpl>) -> WasmResult<u64>;
-        fn form_get_base_experience(r: ExternRef<FormImpl>) -> u32;
+        fn form_get_base_experience(r: ExternRef<FormImpl>) -> WasmResult<u32>;
-        fn form_get_base_stats(r: ExternRef<FormImpl>) -> ExternRef<ImmutableStatisticSetImpl>;
+        fn form_get_base_stats(
-        fn form_get_abilities(r: ExternRef<FormImpl>) -> VecExternRef<StringKey>;
+            r: ExternRef<FormImpl>,
-        fn form_get_hidden_abilities(r: ExternRef<FormImpl>) -> VecExternRef<StringKey>;
+        ) -> WasmResult<ExternRef<ImmutableStatisticSetImpl>>;
-        fn form_has_flag_by_hash(r: ExternRef<FormImpl>, hash: u32) -> bool;
+        fn form_get_abilities(r: ExternRef<FormImpl>) -> WasmResult<u64>;
+        fn form_get_hidden_abilities(r: ExternRef<FormImpl>) -> WasmResult<u64>;
+        fn form_has_flag_by_hash(r: ExternRef<FormImpl>, hash: u32) -> WasmResult<bool>;
 
-        fn species_get_id(r: ExternRef<SpeciesImpl>) -> u16;
+        fn species_get_id(r: ExternRef<SpeciesImpl>) -> WasmResult<u16>;
-        fn species_get_name(r: ExternRef<SpeciesImpl>) -> ExternRef<StringKey>;
+        fn species_get_name(r: ExternRef<SpeciesImpl>) -> WasmResult<ExternRef<StringKey>>;
-        fn species_get_gender_rate(r: ExternRef<SpeciesImpl>) -> f32;
+        fn species_get_gender_rate(r: ExternRef<SpeciesImpl>) -> WasmResult<f32>;
-        fn species_get_growth_rate(r: ExternRef<SpeciesImpl>) -> ExternRef<StringKey>;
+        fn species_get_growth_rate(r: ExternRef<SpeciesImpl>) -> WasmResult<ExternRef<StringKey>>;
-        fn species_get_capture_rate(r: ExternRef<SpeciesImpl>) -> u8;
+        fn species_get_capture_rate(r: ExternRef<SpeciesImpl>) -> WasmResult<u8>;
-        fn species_get_form_by_hash(r: ExternRef<SpeciesImpl>, hash: u32) -> ExternRef<FormImpl>;
+        fn species_get_form_by_hash(
-        fn species_has_flag_by_hash(r: ExternRef<SpeciesImpl>, flag_hash: u32) -> bool;
+            r: ExternRef<SpeciesImpl>,
+            hash: u32,
+        ) -> WasmResult<ExternRef<FormImpl>>;
+        fn species_has_flag_by_hash(r: ExternRef<SpeciesImpl>, flag_hash: u32) -> WasmResult<bool>;
     }
 }
 
+use crate::PkmnResult;
 #[cfg(not(feature = "mock_data"))]
 pub use implementation::*;

pkmn_lib_interface/src/app_interface/static_data/statistics.rs

@@ -11,6 +11,12 @@ pub enum Statistic {
     Speed = 5,
 }
 
+impl Default for Statistic {
+    fn default() -> Self {
+        Self::HP
+    }
+}
+
 pub trait ImmutableStatisticSetTrait {
     fn hp(&self) -> u16;
     fn attack(&self) -> u16;
@@ -28,7 +34,7 @@ mod implementation {
     use crate::cached_value;
     use crate::handling::cached_value::CachedValue;
     use crate::handling::extern_ref::{ExternRef, ExternalReferenceType};
-    use crate::handling::Cacheable;
+    use crate::handling::{Cacheable, WasmResult};
 
     pub struct ImmutableStatisticSetInner {
         reference: ExternRef<ImmutableStatisticSetImpl>,
@@ -56,21 +62,24 @@ mod implementation {
             Self::from_ref(reference, &|reference| Self {
                 inner: Rc::new(ImmutableStatisticSetInner {
                     reference,
-                    hp: cached_value!({ static_statistics_set_get_stat(reference, Statistic::HP) }),
+                    hp: cached_value!({
+                        static_statistics_set_get_stat(reference, Statistic::HP).unwrap()
+                    }),
                     attack: cached_value!({
-                        static_statistics_set_get_stat(reference, Statistic::Attack)
+                        static_statistics_set_get_stat(reference, Statistic::Attack).unwrap()
                     }),
                     defense: cached_value!({
-                        static_statistics_set_get_stat(reference, Statistic::Defense)
+                        static_statistics_set_get_stat(reference, Statistic::Defense).unwrap()
                     }),
                     special_attack: cached_value!({
-                        static_statistics_set_get_stat(reference, Statistic::SpecialAttack)
+                        static_statistics_set_get_stat(reference, Statistic::SpecialAttack).unwrap()
                     }),
                     special_defense: cached_value!({
                         static_statistics_set_get_stat(reference, Statistic::SpecialDefense)
+                            .unwrap()
                     }),
                     speed: cached_value!({
-                        static_statistics_set_get_stat(reference, Statistic::Speed)
+                        static_statistics_set_get_stat(reference, Statistic::Speed).unwrap()
                     }),
                 }),
             })
@@ -110,7 +119,7 @@ mod implementation {
         fn static_statistics_set_get_stat(
             r: ExternRef<ImmutableStatisticSetImpl>,
             stat: Statistic,
-        ) -> u16;
+        ) -> WasmResult<u16>;
     }
 }
 #[cfg(not(feature = "mock_data"))]

pkmn_lib_interface/src/app_interface/string_key.rs

@@ -1,7 +1,12 @@
 #[cfg(not(feature = "mock_data"))]
+use crate::alloc::string::ToString;
+#[cfg(not(feature = "mock_data"))]
+use crate::handling::wasm_result::WasmResult;
+#[cfg(not(feature = "mock_data"))]
 use crate::handling::Cacheable;
+use crate::PkmnResult;
 #[cfg(not(feature = "mock_data"))]
-use crate::{ExternRef, ExternalReferenceType};
+use crate::{pkmn_err, ExternRef, ExternalReferenceType, PkmnErr};
 use alloc::rc::Rc;
 use core::cell::RefCell;
 use core::fmt::{Debug, Display, Formatter};
@@ -21,7 +26,10 @@ pub struct StringKey {
 
 impl Debug for StringKey {
     fn fmt(&self, f: &mut Formatter<'_>) -> core::fmt::Result {
-        write!(f, "\"{}\"", self.str().to_str().unwrap())
+        match self.str() {
+            Ok(s) => write!(f, "\"{}\"", s.to_str().unwrap()),
+            Err(e) => write!(f, "Error: {}", e),
+        }
     }
 }
 
@@ -45,41 +53,44 @@ impl StringKey {
     }
 
     #[cfg(not(feature = "mock_data"))]
-    pub fn str(&self) -> &CString {
+    pub fn str(&self) -> PkmnResult<&CString> {
         if self.data.str.borrow().is_none() {
             unsafe {
-                self.data
+                let ptr = string_key_get_str(self.ptr()).as_res()?;
-                    .str
+                let ptr = ptr as *mut cstr_core::c_char;
-                    .replace(Some(CString::from_raw(string_key_get_str(self.ptr()))));
+                self.data.str.replace(Some(CString::from_raw(ptr)));
             }
         }
-        unsafe { (*self.data.str.as_ptr()).as_ref().unwrap() }
+        Ok(unsafe {
+            (*self.data.str.as_ptr())
+                .as_ref()
+                .ok_or(pkmn_err!("Stringkey was null"))?
+        })
     }
 
     #[cfg(feature = "mock_data")]
-    pub fn str(&self) -> &CString {
+    pub fn str(&self) -> PkmnResult<&CString> {
-        unsafe { (*self.data.str.as_ptr()).as_ref().unwrap() }
+        Ok(unsafe { (*self.data.str.as_ptr()).as_ref().unwrap() })
     }
 
     #[cfg(not(feature = "mock_data"))]
-    pub fn hash(&self) -> u32 {
+    pub fn hash(&self) -> PkmnResult<u32> {
         if self.data.hash.borrow().is_none() {
             unsafe {
-                self.data
+                let hash = string_key_get_hash(self.ptr()).as_res()?;
-                    .hash
+                self.data.hash.replace(Some(hash));
-                    .replace(Some(string_key_get_hash(self.ptr())));
             }
         }
-        self.data.hash.borrow().unwrap()
+        Ok(self.data.hash.borrow().unwrap())
     }
 
     #[cfg(feature = "mock_data")]
-    pub fn hash(&self) -> u32 {
+    pub fn hash(&self) -> PkmnResult<u32> {
-        self.data.hash.borrow().unwrap()
+        Ok(self.data.hash.borrow().unwrap())
     }
 
     pub fn equals_str(&self, other: &str) -> bool {
-        self.hash() == get_hash(other)
+        self.hash().unwrap() == get_hash(other)
     }
 }
 
@@ -107,15 +118,15 @@ impl ExternalReferenceType for StringKey {
 
 impl Display for StringKey {
     fn fmt(&self, f: &mut Formatter<'_>) -> core::fmt::Result {
-        let s = self.str();
+        let s = self.str().unwrap();
         f.write_str(s.to_str().as_ref().unwrap())
     }
 }
 
 #[cfg(not(feature = "mock_data"))]
 extern "wasm" {
-    fn string_key_get_str(ptr: ExternRef<StringKey>) -> *mut cstr_core::c_char;
+    fn string_key_get_str(ptr: ExternRef<StringKey>) -> WasmResult<u32>;
-    fn string_key_get_hash(ptr: ExternRef<StringKey>) -> u32;
+    fn string_key_get_hash(ptr: ExternRef<StringKey>) -> WasmResult<u32>;
 }
 
 const CRC_TABLE: &[u32] = &[

pkmn_lib_interface/src/handling/cached_value.rs

@@ -7,7 +7,7 @@ pub struct CachedValue<T> {
 }
 
 #[cfg(not(feature = "mock_data"))]
-impl<T> CachedValue<T> {
+impl<T: Clone> CachedValue<T> {
     pub fn new(init_fn: Box<dyn Fn() -> T>) -> Self {
         Self {
             init_fn,
@@ -15,13 +15,15 @@ impl<T> CachedValue<T> {
         }
     }
 
-    #[inline(always)]
+    fn init_if_empty(&self) -> T
-    fn init_if_empty(&self) {
+    where
-        if self.value.is_none() {
+        T: Clone,
-            unsafe {
+    {
-                let s = self as *const Self as *mut Self;
+        unsafe {
-                s.as_mut().unwrap().value.replace((self.init_fn)());
+            let s = self as *const Self as *mut Self;
-            }
+            let v = (self.init_fn)();
+            s.as_mut().unwrap().value.replace(v.clone());
+            v
         }
     }
 
@@ -30,8 +32,10 @@ impl<T> CachedValue<T> {
     where
         T: Clone,
     {
-        self.init_if_empty();
+        match self.value {
-        self.value.as_ref().unwrap().clone()
+            Some(ref v) => v.clone(),
+            None => self.init_if_empty(),
+        }
     }
 
     #[inline]

pkmn_lib_interface/src/handling/extern_ref.rs

@@ -1,8 +1,6 @@
 use alloc::rc::Rc;
 use core::cmp::Ordering;
 use core::hash::{Hash, Hasher};
-#[cfg(not(feature = "mock_data"))]
-use core::intrinsics::transmute;
 use core::marker::PhantomData;
 
 #[repr(C)]
@@ -82,6 +80,15 @@ impl<T> Clone for ExternRef<T> {
 
 impl<T> Copy for ExternRef<T> {}
 
+impl<T> Default for ExternRef<T> {
+    fn default() -> Self {
+        Self {
+            p: 0,
+            resource_type: Default::default(),
+        }
+    }
+}
+
 impl<T> Eq for ExternRef<T> {}
 
 impl<T> PartialEq<Self> for ExternRef<T> {
@@ -117,70 +124,6 @@ impl<T> From<u32> for ExternRef<T> {
     }
 }
 
-#[repr(C)]
-pub struct VecExternRef<T> {
-    v: u64,
-    resource_type: PhantomData<T>,
-}
-
-impl<T> VecExternRef<T> {
-    pub fn is_null(&self) -> bool {
-        self.v == 0
-    }
-
-    #[cfg(not(feature = "mock_data"))]
-    pub(crate) fn get_internal_index(&self) -> u32 {
-        let v: (u32, u32) = unsafe { transmute(self.v) };
-        v.0
-    }
-
-    #[cfg(not(feature = "mock_data"))]
-    pub(crate) fn len(&self) -> u32 {
-        let v: (u32, u32) = unsafe { transmute(self.v) };
-        v.1
-    }
-
-    #[cfg(not(feature = "mock_data"))]
-    pub(crate) fn at(&self, index: u32) -> ExternRef<T> {
-        let p = unsafe { _vec_extern_ref_get_value(self.get_internal_index(), index) };
-        ExternRef {
-            p,
-            resource_type: Default::default(),
-        }
-    }
-}
-
-impl<T> Clone for VecExternRef<T> {
-    fn clone(&self) -> Self {
-        Self {
-            v: self.v,
-            resource_type: Default::default(),
-        }
-    }
-}
-
-impl<T> Copy for VecExternRef<T> {}
-
-impl<T> Eq for VecExternRef<T> {}
-
-impl<T> PartialEq<Self> for VecExternRef<T> {
-    fn eq(&self, other: &Self) -> bool {
-        u64::eq(&self.v, &other.v)
-    }
-}
-
-impl<T> PartialOrd<Self> for VecExternRef<T> {
-    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
-        u64::partial_cmp(&self.v, &other.v)
-    }
-}
-
-impl<T> Ord for VecExternRef<T> {
-    fn cmp(&self, other: &Self) -> Ordering {
-        u64::cmp(&self.v, &other.v)
-    }
-}
-
 pub trait ExternalReferenceType {
     fn from_extern_value(reference: ExternRef<Self>) -> Self
     where
@@ -222,8 +165,3 @@ macro_rules! impl_extern_ctor {
         }
     };
 }
-
-#[cfg(not(feature = "mock_data"))]
-extern "wasm" {
-    fn _vec_extern_ref_get_value(extern_ref: u32, index: u32) -> u32;
-}

pkmn_lib_interface/src/handling/ffi_array.rs

@@ -19,6 +19,24 @@ impl<T> FFIArray<T> {
         mem::forget(boxed_slice);
         r
     }
+
+    #[cfg(not(feature = "mock_data"))]
+    pub(crate) fn from_u64(v: u64) -> Self {
+        let v: (u32, u32) = unsafe { core::mem::transmute(v) };
+        Self {
+            ptr: v.0 as *mut T,
+            len: v.1 as usize,
+        }
+    }
+}
+
+impl<T> Default for FFIArray<T> {
+    fn default() -> Self {
+        Self {
+            ptr: core::ptr::null_mut(),
+            len: 0,
+        }
+    }
 }
 
 #[cfg(not(feature = "mock_data"))]

pkmn_lib_interface/src/handling/mod.rs

@@ -8,6 +8,7 @@ pub mod ffi_array;
 pub mod script;
 #[cfg(not(feature = "mock_data"))]
 pub(crate) mod temporary;
+pub(crate) mod wasm_result;
 
 pub use capabilities::*;
 
@@ -15,6 +16,7 @@ pub use capabilities::*;
 pub(crate) use cacheable::Cacheable;
 pub use script::Script;
 pub use script::ScriptOwner;
+pub use wasm_result::*;
 
 #[repr(u8)]
 pub enum ScriptCategory {
@@ -41,7 +43,7 @@ macro_rules! wasm_reference_getters_extern {
 extern "wasm" {
             $(
                 paste::paste!{
-                    fn [<$type_name:snake _get_ $name>](r: ExternRef<$base_type>) -> ExternRef<$type>;
+                    fn [<$type_name:snake _get_ $name>](r: ExternRef<$base_type>) -> WasmResult<ExternRef<$type>>;
                 }
             )*
         }
@@ -151,7 +153,7 @@ macro_rules! wasm_optional_reference_getters_extern {
 extern "wasm" {
             $(
                 paste::paste!{
-                    fn [<$type_name:snake _get_ $name>](r: ExternRef<$base_type>) -> ExternRef<$type>;
+                    fn [<$type_name:snake _get_ $name>](r: ExternRef<$base_type>) -> WasmResult<ExternRef<$type>>;
                 }
             )*
         }
@@ -228,7 +230,7 @@ macro_rules! wasm_value_getters_extern {
 extern "wasm" {
             $(
                 paste::paste!{
-                    fn [<$type_name:snake _get_ $name>](r: ExternRef<$base_type>) -> $type;
+                    fn [<$type_name:snake _get_ $name>](r: ExternRef<$base_type>) -> WasmResult<$type>;
                 }
             )*
         }
@@ -246,10 +248,10 @@ macro_rules! wasm_value_getters_funcs {
     ) => {
         $(
             $(#[$attr])*
-            $v fn $name(&self) -> $type {
+            $v fn $name(&self) -> PkmnResult<$type> {
                 paste::paste!{
                     unsafe{
-                        [<$base_type:snake _get_ $name>](self.inner.reference)
+                        [<$base_type:snake _get_ $name>](self.inner.reference).as_res()
                     }
                 }
             }

pkmn_lib_interface/src/handling/script.rs

@@ -1,4 +1,3 @@
-use crate::app_interface::list::ImmutableList;
 use crate::app_interface::{
     Battle, BattleSide, DamageSource, DynamicLibrary, EffectParameter, ExecutingMove, Item,
     Pokemon, Statistic, TurnChoice, TypeIdentifier,
@@ -6,8 +5,10 @@ use crate::app_interface::{
 use crate::handling::ScriptCapabilities;
 use crate::StringKey;
 use alloc::rc::Rc;
+use alloc::vec::Vec;
 use core::any::Any;
 use core::fmt::{Debug, Display, Formatter};
+type Result<T> = crate::result::PkmnResult<T>;
 
 pub trait Script {
     fn new() -> Self
@@ -18,58 +19,97 @@ pub trait Script {
 
     /// This function is ran when a volatile effect is added while that volatile effect already is
     /// in place. Instead of adding the volatile effect twice, it will execute this function instead.
-    fn stack(&self) {}
+    fn stack(&self) -> Result<()> {
+        Ok(())
+    }
     /// This function is ran when this script stops being in effect, and is removed from its owner.
-    fn on_remove(&self) {}
+    fn on_remove(&self) -> Result<()> {
+        Ok(())
+    }
 
     /// This function is ran when this script starts being in effect.
     fn on_initialize(
         &self,
         _library: DynamicLibrary,
-        _parameters: Option<ImmutableList<Rc<EffectParameter>>>,
+        _parameters: Option<Vec<Rc<EffectParameter>>>,
-    ) {
+    ) -> Result<()> {
+        Ok(())
     }
 
     /// This function is ran just before the start of the turn. Everyone has made its choices here,
     /// and the turn is about to start. This is a great place to initialize data if you need to know
     /// something has happened during a turn.
-    fn on_before_turn(&self, _choice: TurnChoice) {}
+    fn on_before_turn(&self, _choice: TurnChoice) -> Result<()> {
+        Ok(())
+    }
 
     /// This function allows you to modify the effective speed of the Pokemon. This is ran before
     /// turn ordering, so overriding here will allow you to put certain Pokemon before others.
-    fn change_speed(&self, _choice: TurnChoice, _speed: &mut u32) {}
+    fn change_speed(&self, _choice: TurnChoice, _speed: &mut u32) -> Result<()> {
+        Ok(())
+    }
     /// This function allows you to modify the effective priority of the Pokemon. This is ran before
     /// turn ordering, so overriding here will allow you to put certain Pokemon before others. Note
     /// that this is only relevant on move choices, as other turn choice types do not have a priority.
-    fn change_priority(&self, _choice: TurnChoice, _priority: &mut i8) {}
+    fn change_priority(&self, _choice: TurnChoice, _priority: &mut i8) -> Result<()> {
+        Ok(())
+    }
 
     /// This function allows you to change the move that is used during execution. This is useful for
     /// moves such as metronome, where the move chosen actually differs from the move used.
-    fn change_move(&self, _choice: TurnChoice, _move_name: &mut StringKey) {}
+    fn change_move(&self, _choice: TurnChoice, _move_name: &mut StringKey) -> Result<()> {
+        Ok(())
+    }
     /// This function allows you to change a move into a multi-hit move. The number of hits set here
     /// gets used as the number of hits. If set to 0, this will behave as if the move missed on its
     /// first hit.
-    fn change_number_of_hits(&self, _choice: TurnChoice, _number_of_hits: &mut u8) {}
+    fn change_number_of_hits(&self, _choice: TurnChoice, _number_of_hits: &mut u8) -> Result<()> {
+        Ok(())
+    }
 
     /// This function allows you to prevent a move from running. If this gets set to true, the move
     /// ends execution here. No PP will be decreased in this case.
-    fn prevent_move(&self, _move: ExecutingMove, _prevent: &mut bool) {}
+    fn prevent_move(&self, _move: ExecutingMove, _prevent: &mut bool) -> Result<()> {
+        Ok(())
+    }
     /// This function makes the move fail. If the fail field gets set to true, the move ends execution,
     /// and fail events get triggered.
-    fn fail_move(&self, _move: ExecutingMove, _fail: &mut bool) {}
+    fn fail_move(&self, _move: ExecutingMove, _fail: &mut bool) -> Result<()> {
+        Ok(())
+    }
     /// Similar to [`Self::prevent_move`]. This function will also stop execution, but PP will be
     /// decreased.
-    fn stop_before_move(&self, _move: ExecutingMove, _stop: &mut bool) {}
+    fn stop_before_move(&self, _move: ExecutingMove, _stop: &mut bool) -> Result<()> {
+        Ok(())
+    }
     /// This function runs just before the move starts its execution.
-    fn on_before_move(&self, _move: ExecutingMove) {}
+    fn on_before_move(&self, _move: ExecutingMove) -> Result<()> {
+        Ok(())
+    }
     /// This function allows a script to prevent a move that is targeted at its owner. If set to true
     /// the move fails, and fail events get triggered.
-    fn fail_incoming_move(&self, _move: ExecutingMove, _target: Pokemon, _fail: &mut bool) {}
+    fn fail_incoming_move(
+        &self,
+        _move: ExecutingMove,
+        _target: Pokemon,
+        _fail: &mut bool,
+    ) -> Result<()> {
+        Ok(())
+    }
     /// This function allows a script to make its owner invulnerable to an incoming move.
-    fn is_invulnerable(&self, _move: ExecutingMove, _target: Pokemon, _invulnerable: &mut bool) {}
+    fn is_invulnerable(
+        &self,
+        _move: ExecutingMove,
+        _target: Pokemon,
+        _invulnerable: &mut bool,
+    ) -> Result<()> {
+        Ok(())
+    }
     /// This function occurs when a move gets missed. This runs on the scripts belonging to the executing
     /// move, which include the scripts that are attached to the owner of the script.
-    fn on_move_miss(&self, _move: ExecutingMove, _target: Pokemon) {}
+    fn on_move_miss(&self, _move: ExecutingMove, _target: Pokemon) -> Result<()> {
+        Ok(())
+    }
     /// This function allows the script to change the actual type that is used for the move on a target.
     fn change_move_type(
         &self,
@@ -77,7 +117,8 @@ pub trait Script {
         _target: Pokemon,
         _hit: u8,
         _move_type: &mut TypeIdentifier,
-    ) {
+    ) -> Result<()> {
+        Ok(())
     }
     /// This function allows the script to change how effective a move is on a target.
     fn change_effectiveness(
@@ -86,7 +127,8 @@ pub trait Script {
         _target: Pokemon,
         _hit: u8,
         _effectiveness: &mut f32,
-    ) {
+    ) -> Result<()> {
+        Ok(())
     }
     /// This function allows a script to block an outgoing move from being critical.
     fn block_critical(
@@ -95,7 +137,8 @@ pub trait Script {
         _target: Pokemon,
         _hit: u8,
         _block_critical: &mut bool,
-    ) {
+    ) -> Result<()> {
+        Ok(())
     }
     /// This function allows a script to block an incoming move from being critical.
     fn block_incoming_critical(
@@ -104,7 +147,8 @@ pub trait Script {
         _target: Pokemon,
         _hit: u8,
         _block_critical: &mut bool,
-    ) {
+    ) -> Result<()> {
+        Ok(())
     }
     /// This function allows a script to modify the accuracy of a move used. This value represents
     /// the percentage accuracy, so anything above 100% will make it always hit.
@@ -114,7 +158,8 @@ pub trait Script {
         _target: Pokemon,
         _hit: u8,
         _accuracy: &mut u8,
-    ) {
+    ) -> Result<()> {
+        Ok(())
     }
 
     /// This function allows a script to change the critical stage of the move used.
@@ -124,7 +169,8 @@ pub trait Script {
         _target: Pokemon,
         _hit: u8,
         _stage: &mut u8,
-    ) {
+    ) -> Result<()> {
+        Ok(())
     }
     /// This function allows a script to change the damage modifier of a critical hit. This will only
     /// run when a hit is critical.
@@ -134,7 +180,8 @@ pub trait Script {
         _target: Pokemon,
         _hit: u8,
         _modifier: &mut f32,
-    ) {
+    ) -> Result<()> {
+        Ok(())
     }
     /// This function allows a script to change the damage modifier of a Same Type Attack Bonus, which
     /// occurs when the user has the move type as one of its own types.
@@ -144,7 +191,8 @@ pub trait Script {
         _target: Pokemon,
         _hit: u8,
         _modifier: &mut f32,
-    ) {
+    ) -> Result<()> {
+        Ok(())
     }
 
     /// This function allows a script to change the effective base power of a move hit.
@@ -154,7 +202,8 @@ pub trait Script {
         _target: Pokemon,
         _hit: u8,
         _base_power: &mut u8,
-    ) {
+    ) -> Result<()> {
+        Ok(())
     }
     /// This function allows a script to bypass defensive stat boosts for a move hit.
     fn bypass_defensive_stat_boost(
@@ -163,7 +212,8 @@ pub trait Script {
         _target: Pokemon,
         _hit: u8,
         _bypass: &mut bool,
-    ) {
+    ) -> Result<()> {
+        Ok(())
     }
     /// This function allows a script to bypass offensive stat boosts for a move hit.
     fn bypass_offensive_stat_boost(
@@ -172,7 +222,8 @@ pub trait Script {
         _target: Pokemon,
         _hit: u8,
         _bypass: &mut bool,
-    ) {
+    ) -> Result<()> {
+        Ok(())
     }
     /// This function allows a script to change the actual offensive stat values used when calculating damage
     fn change_offensive_stat_value(
@@ -181,7 +232,8 @@ pub trait Script {
         _target: Pokemon,
         _hit: u8,
         _amount: &mut u32,
-    ) {
+    ) -> Result<()> {
+        Ok(())
     }
     /// This function allows a script to change the actual defensive stat values used when calculating damage.
     fn change_defensive_stat_value(
@@ -190,7 +242,8 @@ pub trait Script {
         _target: Pokemon,
         _hit: u8,
         _amount: &mut u32,
-    ) {
+    ) -> Result<()> {
+        Ok(())
     }
 
     /// This function allows a script to change the raw modifier we retrieved from the stats of the
@@ -201,7 +254,8 @@ pub trait Script {
         _target: Pokemon,
         _hit: u8,
         _modifier: &mut f32,
-    ) {
+    ) -> Result<()> {
+        Ok(())
     }
     /// This function allows a script to apply a raw multiplier to the damage done by a move.
     fn change_damage_modifier(
@@ -210,10 +264,19 @@ pub trait Script {
         _target: Pokemon,
         _hit: u8,
         _modifier: &mut f32,
-    ) {
+    ) -> Result<()> {
+        Ok(())
     }
     /// This function allows a script to modify the outgoing damage done by a move.
-    fn change_damage(&self, _move: ExecutingMove, _target: Pokemon, _hit: u8, _damage: &mut u32) {}
+    fn change_damage(
+        &self,
+        _move: ExecutingMove,
+        _target: Pokemon,
+        _hit: u8,
+        _damage: &mut u32,
+    ) -> Result<()> {
+        Ok(())
+    }
     /// This function allows a script to modify the incoming damage done by a move.
     fn change_incoming_damage(
         &self,
@@ -221,13 +284,18 @@ pub trait Script {
         _target: Pokemon,
         _hit: u8,
         _damage: &mut u32,
-    ) {
+    ) -> Result<()> {
+        Ok(())
     }
     /// This function triggers when an incoming hit happens. This triggers after the damage is done,
     /// but before the secondary effect of the move happens.
-    fn on_incoming_hit(&self, _move: ExecutingMove, _target: Pokemon, _hit: u8) {}
+    fn on_incoming_hit(&self, _move: ExecutingMove, _target: Pokemon, _hit: u8) -> Result<()> {
+        Ok(())
+    }
     /// This function triggers when an opponent on the field faints.
-    fn on_opponent_faints(&self, _move: ExecutingMove, _target: Pokemon, _hit: u8) {}
+    fn on_opponent_faints(&self, _move: ExecutingMove, _target: Pokemon, _hit: u8) -> Result<()> {
+        Ok(())
+    }
     /// This function allows a script attached to a Pokemon or its parents to prevent stat boost
     /// changes on that Pokemon.
     fn prevent_stat_boost_change(
@@ -237,7 +305,8 @@ pub trait Script {
         _amount: i8,
         _self_inflicted: bool,
         _prevent: &mut bool,
-    ) {
+    ) -> Result<()> {
+        Ok(())
     }
     /// This function allows a script attached to a Pokemon or its parents to modify the amount by
     /// which the stat boost will change. If the stat boost is done by the user itself, self
@@ -248,7 +317,8 @@ pub trait Script {
         _stat: Statistic,
         _self_inflicted: bool,
         _amount: &mut i8,
-    ) {
+    ) -> Result<()> {
+        Ok(())
     }
     /// This function allows a script attached to a Pokemon or its parents to prevent an incoming
     /// secondary effect. This means the move will still hit and do damage, but not trigger its
@@ -259,7 +329,8 @@ pub trait Script {
         _target: Pokemon,
         _hit: u8,
         _prevent: &mut bool,
-    ) {
+    ) -> Result<()> {
+        Ok(())
     }
     /// This function allows a script attached to a move or its parents to change the chance the
     /// secondary effect of a move will trigger. The chance is depicted in percentage here, so
@@ -271,7 +342,8 @@ pub trait Script {
         _target: Pokemon,
         _hit: u8,
         _chance: &mut f32,
-    ) {
+    ) -> Result<()> {
+        Ok(())
     }
     /// This function allows a script attached to a Pokemon or its parents to change the chance the
     /// secondary effect of an incoming move will trigger. The chance is depicted in percentage here,
@@ -283,30 +355,49 @@ pub trait Script {
         _target: Pokemon,
         _hit: u8,
         _chance: &mut f32,
-    ) {
+    ) -> Result<()> {
+        Ok(())
     }
     /// This function triggers when the move uses its secondary effect. Moves should implement their
     /// secondary effects here. Status moves should implement their actual functionality in this
     /// function as well, as status moves effects are defined as secondary effects for simplicity.
-    fn on_secondary_effect(&self, _move: ExecutingMove, _target: Pokemon, _hit: u8) {}
+    fn on_secondary_effect(&self, _move: ExecutingMove, _target: Pokemon, _hit: u8) -> Result<()> {
+        Ok(())
+    }
     /// This function triggers on a move or its parents when all hits on a target are finished.
-    fn on_after_hits(&self, _move: ExecutingMove, _target: Pokemon) {}
+    fn on_after_hits(&self, _move: ExecutingMove, _target: Pokemon) -> Result<()> {
+        Ok(())
+    }
     /// This function prevents the Pokemon it is attached to from being able to switch out.
-    fn prevent_self_switch(&self, _choice: TurnChoice, _prevent: &mut bool) {}
+    fn prevent_self_switch(&self, _choice: TurnChoice, _prevent: &mut bool) -> Result<()> {
+        Ok(())
+    }
     /// This function allows the prevention of switching for any opponent.
-    fn prevent_opponent_switch(&self, _choice: TurnChoice, _prevent: &mut bool) {}
+    fn prevent_opponent_switch(&self, _choice: TurnChoice, _prevent: &mut bool) -> Result<()> {
+        Ok(())
+    }
     /// This function is called on a move and its parents when the move fails.
-    fn on_fail(&self, _target: Pokemon) {}
+    fn on_fail(&self, _target: Pokemon) -> Result<()> {
+        Ok(())
+    }
     /// This function is called on a script when an opponent fails.
-    fn on_opponent_fail(&self, _target: Pokemon) {}
+    fn on_opponent_fail(&self, _target: Pokemon) -> Result<()> {
+        Ok(())
+    }
     /// This function allows preventing the running away of the Pokemon its attached to
-    fn prevent_self_run_away(&self, _choice: TurnChoice, _prevent: &mut bool) {}
+    fn prevent_self_run_away(&self, _choice: TurnChoice, _prevent: &mut bool) -> Result<()> {
+        Ok(())
+    }
     /// This function prevents a Pokemon on another side than where its attached to from running away.
-    fn prevent_opponent_run_away(&self, _choice: TurnChoice, _prevent: &mut bool) {}
+    fn prevent_opponent_run_away(&self, _choice: TurnChoice, _prevent: &mut bool) -> Result<()> {
+        Ok(())
+    }
     /// This function id triggered on all scripts active in the battle after all choices have finished
     /// running. Note that choices are not active anymore here, so their scripts do not call this
     /// function.
-    fn on_end_turn(&self) {}
+    fn on_end_turn(&self) -> Result<()> {
+        Ok(())
+    }
     /// This function is triggered on a Pokemon and its parents when the given Pokemon takes damage.
     fn on_damage(
         &self,
@@ -314,16 +405,23 @@ pub trait Script {
         _source: DamageSource,
         _old_health: u32,
         _new_health: u32,
-    ) {
+    ) -> Result<()> {
+        Ok(())
     }
     /// This function is triggered on a Pokemon and its parents when the given Pokemon faints.
-    fn on_faint(&self, _pokemon: Pokemon, _source: DamageSource) {}
+    fn on_faint(&self, _pokemon: Pokemon, _source: DamageSource) -> Result<()> {
+        Ok(())
+    }
     /// This function is triggered on a Pokemon and its parents when the given Pokemon is switched into
     /// the battlefield.
-    fn on_switch_in(&self, _pokemon: Pokemon) {}
+    fn on_switch_in(&self, _pokemon: Pokemon) -> Result<()> {
+        Ok(())
+    }
     /// This function is triggered on a Pokemon and its parents when the given Pokemon consumes the
     /// held item it had.
-    fn on_after_held_item_consume(&self, _pokemon: Pokemon, _item: Item) {}
+    fn on_after_held_item_consume(&self, _pokemon: Pokemon, _item: Item) -> Result<()> {
+        Ok(())
+    }
     /// This function is triggered on a Pokemon and its parents when the given Pokemon gains experience,
     /// and allows for changing this amount of experience.
     fn change_experience_gained(
@@ -331,18 +429,35 @@ pub trait Script {
         _fainted_mon: Pokemon,
         _winning_mon: Pokemon,
         _amount: &mut u32,
-    ) {
+    ) -> Result<()> {
+        Ok(())
     }
     /// This function is triggered on a Pokemon and its parents when the given Pokemon gains experience,
     /// and allows for making the experience be shared across multiple Pokemon.
-    fn share_experience(&self, _fainted_mon: Pokemon, _winning_mon: Pokemon, _shares: &mut bool) {}
+    fn share_experience(
+        &self,
+        _fainted_mon: Pokemon,
+        _winning_mon: Pokemon,
+        _shares: &mut bool,
+    ) -> Result<()> {
+        Ok(())
+    }
     /// This function is triggered on a battle and its parents when something attempts to change the
     /// weather, and allows for blocking the weather change.
-    fn block_weather(&self, _battle: Battle, _blocked: &mut bool) {}
+    fn block_weather(&self, _battle: Battle, _blocked: &mut bool) -> Result<()> {
+        Ok(())
+    }
     /// This function is called when a Pokeball is thrown at a Pokemon, and allows modifying the catch
     /// rate of this attempt. Pokeball modifier effects should be implemented here, as well as for
     /// example status effects that change capture rates.
-    fn change_capture_rate_bonus(&self, _target: Pokemon, _pokeball: Item, _modifier: &mut u8) {}
+    fn change_capture_rate_bonus(
+        &self,
+        _target: Pokemon,
+        _pokeball: Item,
+        _modifier: &mut u8,
+    ) -> Result<()> {
+        Ok(())
+    }
 
     fn as_any(&self) -> &dyn Any;
 

pkmn_lib_interface/src/handling/wasm_result.rs

@@ -0,0 +1,90 @@
+use crate::{pkmn_err, PkmnErr, PkmnResult};
+use alloc::string::ToString;
+use cstr_core::{c_char, CString};
+
+#[repr(C)]
+#[repr(packed)]
+#[derive(Debug)]
+pub struct WasmResult<T>
+where
+    T: Default,
+{
+    err_ptr: u32,
+    value: T,
+}
+
+pub type WasmVoidResult = WasmResult<()>;
+
+impl<T> WasmResult<T>
+where
+    T: Default,
+{
+    pub fn unwrap(self) -> T {
+        unsafe {
+            if self.err_ptr == 0 {
+                self.value
+            } else {
+                let ptr = self.err_ptr as *mut c_char;
+                let s = CString::from_raw(ptr).to_string_lossy().to_string();
+                panic!("{}", s)
+            }
+        }
+    }
+
+    pub fn as_res(self) -> PkmnResult<T> {
+        PkmnResult::from(self)
+    }
+
+    pub fn ok(value: T) -> Self {
+        WasmResult { err_ptr: 0, value }
+    }
+
+    pub fn err(err: PkmnErr) -> Self {
+        let s: CString = err.into();
+        let ptr = s.into_raw();
+        WasmResult {
+            err_ptr: ptr as u32,
+            value: Default::default(),
+        }
+    }
+
+    pub fn from_res(res: PkmnResult<T>) -> Self {
+        WasmResult::from(res)
+    }
+}
+
+impl<T> From<WasmResult<T>> for crate::PkmnResult<T>
+where
+    T: Default,
+{
+    fn from(value: WasmResult<T>) -> Self {
+        unsafe {
+            if value.err_ptr == 0 {
+                Ok(value.value)
+            } else {
+                let ptr = value.err_ptr as *mut c_char;
+                let s = CString::from_raw(ptr).to_string_lossy().to_string();
+                Err(pkmn_err!(s))
+            }
+        }
+    }
+}
+
+impl<T> From<crate::PkmnResult<T>> for WasmResult<T>
+where
+    T: Default,
+{
+    fn from(value: PkmnResult<T>) -> Self {
+        match value {
+            Ok(value) => WasmResult { err_ptr: 0, value },
+            Err(e) => {
+                let s: CString = e.into();
+                let ptr = s.into_raw();
+                WasmResult {
+                    err_ptr: ptr as u32,
+                    value: Default::default(),
+                }
+            }
+        }
+    }
+}

pkmn_lib_interface/src/lib.rs

@@ -12,11 +12,13 @@
 #![feature(thread_local)]
 #![feature(build_hasher_simple_hash_one)]
 #![feature(adt_const_params)]
+#![feature(try_trait_v2)]
 #![cfg_attr(not(feature = "mock_data"), no_std)]
 #![allow(incomplete_features)]
 // These give false positives too often
 #![allow(clippy::borrowed_box)]
 #![allow(clippy::needless_lifetimes)]
+#![allow(stable_features)]
 
 extern crate alloc;
 extern crate core;
@@ -33,25 +35,28 @@ use alloc::boxed::Box;
 #[allow(dead_code)]
 pub mod app_interface;
 pub mod handling;
+mod result;
 pub mod utils;
 
+pub use result::*;
+
 pub type LoadScriptFnType = Box<dyn Fn(ScriptCategory, &StringKey) -> Option<Box<dyn Script>>>;
 
 #[cfg(not(feature = "mock_data"))]
 mod implementation {
     use super::LoadScriptFnType;
 
-    use crate::app_interface::list::{EffectParameterImmutableList, ImmutableListWasm};
     use crate::app_interface::{
         BattleImpl, DamageSource, DynamicLibraryImpl, EffectParameter, ExecutingMoveImpl, ItemImpl,
         PokemonImpl, Statistic, StringKey, TurnChoice, TypeIdentifier,
     };
     use crate::handling::extern_ref::ExternRef;
-    use crate::handling::extern_ref::VecExternRef;
     use crate::handling::ffi_array::FFIArray;
+    use crate::handling::wasm_result::WasmVoidResult;
     use crate::handling::{Script, ScriptCapabilities, ScriptCategory};
     use alloc::boxed::Box;
     use alloc::rc::Rc;
+    use alloc::vec::Vec;
     use core::sync::atomic::{AtomicU32, Ordering};
     use cstr_core::{c_char, CString};
     use hashbrown::HashMap;
@@ -86,7 +91,7 @@ mod implementation {
     static mut SCRIPT_INDEX_COUNTER: AtomicU32 = AtomicU32::new(1);
 
     #[repr(C)]
-    #[derive(Copy, Clone)]
+    #[derive(Copy, Clone, Default)]
     pub struct ScriptPtr {
         index: u32,
     }
@@ -183,56 +188,64 @@ mod implementation {
         FFIArray::new(c)
     }
 
-    fn script_stack(script: ScriptPtr) {
+    fn script_stack(script: ScriptPtr) -> WasmVoidResult {
-        script.val().unwrap().stack();
+        WasmVoidResult::from_res(script.val().unwrap().stack())
     }
 
-    fn script_on_remove(script: ScriptPtr) {
+    fn script_on_remove(script: ScriptPtr) -> WasmVoidResult {
-        script.val().unwrap().on_remove();
+        WasmVoidResult::from_res(script.val().unwrap().on_remove())
     }
 
     fn script_on_initialize(
         script: ScriptPtr,
         library: ExternRef<DynamicLibraryImpl>,
-        parameters: VecExternRef<EffectParameter>,
+        parameters: u64,
-    ) {
+    ) -> WasmVoidResult {
-        let parameters = Rc::new(EffectParameterImmutableList::from_ref(parameters));
+        let parameters : FFIArray<ExternRef<EffectParameter>> = FFIArray::from_u64(parameters);
-        script.val().unwrap().on_initialize(library.not_null_rc(), Some(parameters));
+        let parameters = Vec::from_raw_parts(parameters.ptr(), parameters.len(), parameters.len());
+        let parameters = parameters.into_iter().map(|p| Rc::new(EffectParameter::new(p).unwrap())).collect::<Vec<_>>();
+        WasmVoidResult::from_res(script.val().unwrap().on_initialize(library.not_null_rc(), Some(parameters)))
     }
 
     fn script_on_before_turn(
         script: ScriptPtr,
         choice: ExternRef<TurnChoice>,
-    ) {
+    ) -> WasmVoidResult {
-        script.val().unwrap().on_before_turn(choice.not_null())
+        WasmVoidResult::from_res(script.val().unwrap().on_before_turn(choice.not_null()))
     }
 
     fn script_change_speed(
         script:ScriptPtr,
         choice: ExternRef<TurnChoice>,
         speed: *mut u32,
-    ) {
+    ) -> WasmVoidResult {
-        script.val().unwrap().change_speed(choice.not_null(), speed.as_mut().unwrap())
+        WasmVoidResult::from_res(script.val().unwrap().change_speed(choice.not_null(), speed.as_mut().unwrap()))
     }
 
     fn script_change_priority(
         script: ScriptPtr,
         choice: ExternRef<TurnChoice>,
         priority: *mut i8,
-    ) {
+    ) -> WasmVoidResult {
-        script.val().unwrap().change_priority(choice.not_null(), priority.as_mut().unwrap())
+        WasmVoidResult::from_res(script.val().unwrap().change_priority(choice.not_null(), priority.as_mut().unwrap()))
     }
 
     fn script_change_move(
         script: ScriptPtr,
         choice: ExternRef<TurnChoice>,
         mv: *mut ExternRef<StringKey>,
-    ) {
+    ) -> WasmVoidResult {
         let old = mv.as_ref().unwrap().not_null();
         let mut new = old.clone();
-        script.val().unwrap().change_move(choice.not_null(), &mut new);
+        let res = script.val().unwrap().change_move(choice.not_null(), &mut new);
-        if old != new {
+        match res {
-            *mv = new.ptr();
+            Ok(_) => {
+                if old != new {
+                    *mv = new.ptr();
+                }
+                WasmVoidResult::ok(())
+            }
+            Err(e) => WasmVoidResult::err(e),
         }
     }
 
@@ -240,39 +253,39 @@ mod implementation {
         script: ScriptPtr,
         choice: ExternRef<TurnChoice>,
         out: *mut u8,
-    ) {
+    ) -> WasmVoidResult {
-        script.val().unwrap().change_number_of_hits(choice.not_null(), out.as_mut().unwrap());
+        WasmVoidResult::from_res(script.val().unwrap().change_number_of_hits(choice.not_null(), out.as_mut().unwrap()))
     }
 
     fn script_prevent_move(
         script: ScriptPtr,
         mv: ExternRef<ExecutingMoveImpl>,
         out: *mut bool,
-    ) {
+    ) -> WasmVoidResult {
-        script.val().unwrap().prevent_move(mv.not_null_rc(), out.as_mut().unwrap());
+        WasmVoidResult::from_res(script.val().unwrap().prevent_move(mv.not_null_rc(), out.as_mut().unwrap()))
     }
 
     fn script_fail_move(
         script: ScriptPtr,
         mv: ExternRef<ExecutingMoveImpl>,
         out: *mut bool,
-    ) {
+    ) -> WasmVoidResult {
-        script.val().unwrap().fail_move(mv.not_null_rc(), out.as_mut().unwrap());
+        WasmVoidResult::from_res(script.val().unwrap().fail_move(mv.not_null_rc(), out.as_mut().unwrap()))
     }
 
     fn script_stop_before_move(
         script: ScriptPtr,
         mv: ExternRef<ExecutingMoveImpl>,
         out: *mut bool,
-    ) {
+    ) -> WasmVoidResult {
-        script.val().unwrap().stop_before_move(mv.not_null_rc(), out.as_mut().unwrap());
+        WasmVoidResult::from_res(script.val().unwrap().stop_before_move(mv.not_null_rc(), out.as_mut().unwrap()))
     }
 
     fn script_on_before_move(
         script: ScriptPtr,
         mv: ExternRef<ExecutingMoveImpl>,
-    ) {
+    ) -> WasmVoidResult {
-        script.val().unwrap().on_before_move(mv.not_null_rc());
+        WasmVoidResult::from_res(script.val().unwrap().on_before_move(mv.not_null_rc()))
     }
 
     fn script_fail_incoming_move(
@@ -280,8 +293,8 @@ mod implementation {
         mv: ExternRef<ExecutingMoveImpl>,
         target: ExternRef<PokemonImpl>,
         out: *mut bool,
-    ) {
+    ) -> WasmVoidResult {
-        script.val().unwrap().fail_incoming_move(mv.not_null_rc(), target.not_null_rc(), out.as_mut().unwrap());
+        WasmVoidResult::from_res(script.val().unwrap().fail_incoming_move(mv.not_null_rc(), target.not_null_rc(), out.as_mut().unwrap()))
     }
 
     fn script_is_invulnerable(
@@ -289,16 +302,16 @@ mod implementation {
         mv: ExternRef<ExecutingMoveImpl>,
         target: ExternRef<PokemonImpl>,
         out: *mut bool,
-    ) {
+    ) -> WasmVoidResult {
-        script.val().unwrap().is_invulnerable(mv.not_null_rc(), target.not_null_rc(), out.as_mut().unwrap());
+        WasmVoidResult::from_res(script.val().unwrap().is_invulnerable(mv.not_null_rc(), target.not_null_rc(), out.as_mut().unwrap()))
     }
 
     fn script_on_move_miss(
         script: ScriptPtr,
         mv: ExternRef<ExecutingMoveImpl>,
         target: ExternRef<PokemonImpl>,
-    ) {
+    ) -> WasmVoidResult {
-        script.val().unwrap().on_move_miss(mv.not_null_rc(), target.not_null_rc());
+        WasmVoidResult::from_res(script.val().unwrap().on_move_miss(mv.not_null_rc(), target.not_null_rc()))
     }
 
     fn script_change_move_type(
@@ -307,8 +320,8 @@ mod implementation {
         target: ExternRef<PokemonImpl>,
         hit: u8,
         out: *mut TypeIdentifier,
-    ) {
+    ) -> WasmVoidResult {
-        script.val().unwrap().change_move_type(mv.not_null_rc(), target.not_null_rc(), hit, out.as_mut().unwrap());
+        WasmVoidResult::from_res(script.val().unwrap().change_move_type(mv.not_null_rc(), target.not_null_rc(), hit, out.as_mut().unwrap()))
     }
 
     fn script_change_effectiveness(
@@ -317,8 +330,8 @@ mod implementation {
         target: ExternRef<PokemonImpl>,
         hit: u8,
         out: *mut f32,
-    ) {
+    ) -> WasmVoidResult {
-        script.val().unwrap().change_effectiveness(mv.not_null_rc(), target.not_null_rc(), hit, out.as_mut().unwrap());
+        WasmVoidResult::from_res(script.val().unwrap().change_effectiveness(mv.not_null_rc(), target.not_null_rc(), hit, out.as_mut().unwrap()))
     }
 
     fn script_block_critical(
@@ -327,8 +340,8 @@ mod implementation {
         target: ExternRef<PokemonImpl>,
         hit: u8,
         out: *mut bool,
-    ) {
+    ) -> WasmVoidResult {
-        script.val().unwrap().block_critical(mv.not_null_rc(), target.not_null_rc(), hit, out.as_mut().unwrap());
+        WasmVoidResult::from_res(script.val().unwrap().block_critical(mv.not_null_rc(), target.not_null_rc(), hit, out.as_mut().unwrap()))
     }
 
     fn script_block_incoming_critical(
@@ -337,8 +350,8 @@ mod implementation {
         target: ExternRef<PokemonImpl>,
         hit: u8,
         out: *mut bool,
-    ) {
+    ) -> WasmVoidResult {
-        script.val().unwrap().block_incoming_critical(mv.not_null_rc(), target.not_null_rc(), hit, out.as_mut().unwrap());
+        WasmVoidResult::from_res(script.val().unwrap().block_incoming_critical(mv.not_null_rc(), target.not_null_rc(), hit, out.as_mut().unwrap()))
     }
 
     fn script_change_accuracy(
@@ -347,8 +360,8 @@ mod implementation {
         target: ExternRef<PokemonImpl>,
         hit: u8,
         out: *mut u8,
-    ) {
+    ) -> WasmVoidResult {
-        script.val().unwrap().change_accuracy(mv.not_null_rc(), target.not_null_rc(), hit, out.as_mut().unwrap());
+        WasmVoidResult::from_res(script.val().unwrap().change_accuracy(mv.not_null_rc(), target.not_null_rc(), hit, out.as_mut().unwrap()))
     }
 
     fn script_change_critical_stage(
@@ -357,8 +370,8 @@ mod implementation {
         target: ExternRef<PokemonImpl>,
         hit: u8,
         out: *mut u8,
-    ) {
+    ) -> WasmVoidResult {
-        script.val().unwrap().change_critical_stage(mv.not_null_rc(), target.not_null_rc(), hit, out.as_mut().unwrap());
+        WasmVoidResult::from_res(script.val().unwrap().change_critical_stage(mv.not_null_rc(), target.not_null_rc(), hit, out.as_mut().unwrap()))
     }
 
     fn script_change_critical_modifier(
@@ -367,8 +380,8 @@ mod implementation {
         target: ExternRef<PokemonImpl>,
         hit: u8,
         out: *mut f32,
-    ) {
+    ) -> WasmVoidResult {
-        script.val().unwrap().change_critical_modifier(mv.not_null_rc(), target.not_null_rc(), hit, out.as_mut().unwrap());
+        WasmVoidResult::from_res(script.val().unwrap().change_critical_modifier(mv.not_null_rc(), target.not_null_rc(), hit, out.as_mut().unwrap()))
     }
 
     fn script_change_stab_modifier(
@@ -377,8 +390,8 @@ mod implementation {
         target: ExternRef<PokemonImpl>,
         hit: u8,
         out: *mut f32,
-    ) {
+    ) -> WasmVoidResult {
-        script.val().unwrap().change_stab_modifier(mv.not_null_rc(), target.not_null_rc(), hit, out.as_mut().unwrap());
+        WasmVoidResult::from_res(script.val().unwrap().change_stab_modifier(mv.not_null_rc(), target.not_null_rc(), hit, out.as_mut().unwrap()))
     }
 
     fn script_change_base_power(
@@ -387,8 +400,8 @@ mod implementation {
         target: ExternRef<PokemonImpl>,
         hit: u8,
         out: *mut u8,
-    ) {
+    ) -> WasmVoidResult {
-        script.val().unwrap().change_base_power(mv.not_null_rc(), target.not_null_rc(), hit, out.as_mut().unwrap());
+        WasmVoidResult::from_res(script.val().unwrap().change_base_power(mv.not_null_rc(), target.not_null_rc(), hit, out.as_mut().unwrap()))
     }
 
     fn script_bypass_defensive_stat_boost(
@@ -397,8 +410,8 @@ mod implementation {
         target: ExternRef<PokemonImpl>,
         hit: u8,
         out: *mut bool,
-    ) {
+    ) -> WasmVoidResult {
-        script.val().unwrap().bypass_defensive_stat_boost(mv.not_null_rc(), target.not_null_rc(), hit, out.as_mut().unwrap());
+        WasmVoidResult::from_res(script.val().unwrap().bypass_defensive_stat_boost(mv.not_null_rc(), target.not_null_rc(), hit, out.as_mut().unwrap()))
     }
 
     fn script_bypass_offensive_stat_boost(
@@ -407,8 +420,8 @@ mod implementation {
         target: ExternRef<PokemonImpl>,
         hit: u8,
         out: *mut bool,
-    ) {
+    ) -> WasmVoidResult {
-        script.val().unwrap().bypass_offensive_stat_boost(mv.not_null_rc(), target.not_null_rc(), hit, out.as_mut().unwrap());
+        WasmVoidResult::from_res(script.val().unwrap().bypass_offensive_stat_boost(mv.not_null_rc(), target.not_null_rc(), hit, out.as_mut().unwrap()))
     }
 
     fn script_change_defensive_stat_value(
@@ -417,8 +430,8 @@ mod implementation {
         target: ExternRef<PokemonImpl>,
         hit: u8,
         out: *mut u32,
-    ) {
+    ) -> WasmVoidResult {
-        script.val().unwrap().change_defensive_stat_value(mv.not_null_rc(), target.not_null_rc(), hit, out.as_mut().unwrap());
+        WasmVoidResult::from_res(script.val().unwrap().change_defensive_stat_value(mv.not_null_rc(), target.not_null_rc(), hit, out.as_mut().unwrap()))
     }
 
     fn script_change_offensive_stat_value(
@@ -427,8 +440,8 @@ mod implementation {
         target: ExternRef<PokemonImpl>,
         hit: u8,
         out: *mut u32,
-    ) {
+    ) -> WasmVoidResult {
-        script.val().unwrap().change_offensive_stat_value(mv.not_null_rc(), target.not_null_rc(), hit, out.as_mut().unwrap());
+        WasmVoidResult::from_res(script.val().unwrap().change_offensive_stat_value(mv.not_null_rc(), target.not_null_rc(), hit, out.as_mut().unwrap()))
     }
 
     fn script_change_damage_stat_modifier(
@@ -437,8 +450,8 @@ mod implementation {
         target: ExternRef<PokemonImpl>,
         hit: u8,
         out: *mut f32,
-    ) {
+    ) -> WasmVoidResult {
-        script.val().unwrap().change_damage_stat_modifier(mv.not_null_rc(), target.not_null_rc(), hit, out.as_mut().unwrap());
+        WasmVoidResult::from_res(script.val().unwrap().change_damage_stat_modifier(mv.not_null_rc(), target.not_null_rc(), hit, out.as_mut().unwrap()))
     }
 
     fn script_change_damage_modifier(
@@ -447,8 +460,8 @@ mod implementation {
         target: ExternRef<PokemonImpl>,
         hit: u8,
         out: *mut f32,
-    ) {
+    ) -> WasmVoidResult {
-        script.val().unwrap().change_damage_modifier(mv.not_null_rc(), target.not_null_rc(), hit, out.as_mut().unwrap());
+        WasmVoidResult::from_res(script.val().unwrap().change_damage_modifier(mv.not_null_rc(), target.not_null_rc(), hit, out.as_mut().unwrap()))
     }
 
     fn script_change_damage(
@@ -457,8 +470,8 @@ mod implementation {
         target: ExternRef<PokemonImpl>,
         hit: u8,
         out: *mut u32,
-    ) {
+    ) -> WasmVoidResult {
-        script.val().unwrap().change_damage(mv.not_null_rc(), target.not_null_rc(), hit, out.as_mut().unwrap());
+        WasmVoidResult::from_res(script.val().unwrap().change_damage(mv.not_null_rc(), target.not_null_rc(), hit, out.as_mut().unwrap()))
     }
 
     fn script_change_incoming_damage(
@@ -467,8 +480,8 @@ mod implementation {
         target: ExternRef<PokemonImpl>,
         hit: u8,
         out: *mut u32,
-    ) {
+    ) -> WasmVoidResult {
-        script.val().unwrap().change_incoming_damage(mv.not_null_rc(), target.not_null_rc(), hit, out.as_mut().unwrap());
+        WasmVoidResult::from_res(script.val().unwrap().change_incoming_damage(mv.not_null_rc(), target.not_null_rc(), hit, out.as_mut().unwrap()))
     }
 
     fn script_on_incoming_hit(
@@ -476,8 +489,8 @@ mod implementation {
         mv: ExternRef<ExecutingMoveImpl>,
         target: ExternRef<PokemonImpl>,
         hit: u8,
-    ) {
+    ) -> WasmVoidResult {
-        script.val().unwrap().on_incoming_hit(mv.not_null_rc(), target.not_null_rc(), hit);
+        WasmVoidResult::from_res(script.val().unwrap().on_incoming_hit(mv.not_null_rc(), target.not_null_rc(), hit))
     }
 
     fn script_on_opponent_faints(
@@ -485,8 +498,8 @@ mod implementation {
         mv: ExternRef<ExecutingMoveImpl>,
         target: ExternRef<PokemonImpl>,
         hit: u8,
-    ) {
+    ) -> WasmVoidResult {
-        script.val().unwrap().on_opponent_faints(mv.not_null_rc(), target.not_null_rc(), hit);
+        WasmVoidResult::from_res(script.val().unwrap().on_opponent_faints(mv.not_null_rc(), target.not_null_rc(), hit))
     }
 
     fn script_prevent_stat_boost_change(
@@ -496,8 +509,8 @@ mod implementation {
         amount: i8,
         self_inflicted: u8,
         out: *mut bool,
-    ) {
+    ) -> WasmVoidResult {
-        script.val().unwrap().prevent_stat_boost_change(target.not_null_rc(), stat, amount, self_inflicted == 1, out.as_mut().unwrap());
+        WasmVoidResult::from_res(script.val().unwrap().prevent_stat_boost_change(target.not_null_rc(), stat, amount, self_inflicted == 1, out.as_mut().unwrap()))
     }
 
     fn script_prevent_secondary_effect(
@@ -506,8 +519,8 @@ mod implementation {
         target: ExternRef<PokemonImpl>,
         hit: u8,
         out: *mut bool,
-    ) {
+    ) -> WasmVoidResult {
-        script.val().unwrap().prevent_secondary_effect(mv.not_null_rc(), target.not_null_rc(), hit, out.as_mut().unwrap());
+        WasmVoidResult::from_res(script.val().unwrap().prevent_secondary_effect(mv.not_null_rc(), target.not_null_rc(), hit, out.as_mut().unwrap()))
     }
 
     fn script_change_effect_chance(
@@ -516,8 +529,8 @@ mod implementation {
         target: ExternRef<PokemonImpl>,
         hit: u8,
         out: *mut f32,
-    ) {
+    ) -> WasmVoidResult {
-        script.val().unwrap().change_effect_chance(mv.not_null_rc(), target.not_null_rc(), hit, out.as_mut().unwrap());
+        WasmVoidResult::from_res(script.val().unwrap().change_effect_chance(mv.not_null_rc(), target.not_null_rc(), hit, out.as_mut().unwrap()))
     }
 
     fn script_change_incoming_effect_chance(
@@ -526,8 +539,8 @@ mod implementation {
         target: ExternRef<PokemonImpl>,
         hit: u8,
         out: *mut f32,
-    ) {
+    ) -> WasmVoidResult {
-        script.val().unwrap().change_incoming_effect_chance(mv.not_null_rc(), target.not_null_rc(), hit, out.as_mut().unwrap());
+        WasmVoidResult::from_res(script.val().unwrap().change_incoming_effect_chance(mv.not_null_rc(), target.not_null_rc(), hit, out.as_mut().unwrap()))
     }
 
     fn script_on_secondary_effect(
@@ -535,68 +548,68 @@ mod implementation {
         mv: ExternRef<ExecutingMoveImpl>,
         target: ExternRef<PokemonImpl>,
         hit: u8,
-    ) {
+    ) -> WasmVoidResult {
-        script.val().unwrap().on_secondary_effect(mv.not_null_rc(), target.not_null_rc(), hit);
+        WasmVoidResult::from_res(script.val().unwrap().on_secondary_effect(mv.not_null_rc(), target.not_null_rc(), hit))
     }
 
     fn script_on_after_hits(
         script: ScriptPtr,
         mv: ExternRef<ExecutingMoveImpl>,
         target: ExternRef<PokemonImpl>,
-    ) {
+    ) -> WasmVoidResult {
-        script.val().unwrap().on_after_hits(mv.not_null_rc(), target.not_null_rc());
+        WasmVoidResult::from_res(script.val().unwrap().on_after_hits(mv.not_null_rc(), target.not_null_rc()))
     }
 
     fn script_prevent_self_switch(
         script: ScriptPtr,
         choice: ExternRef<TurnChoice>,
         out: *mut bool,
-    ) {
+    ) -> WasmVoidResult {
-        script.val().unwrap().prevent_self_switch(choice.not_null(), out.as_mut().unwrap());
+        WasmVoidResult::from_res(script.val().unwrap().prevent_self_switch(choice.not_null(), out.as_mut().unwrap()))
     }
 
     fn script_prevent_opponent_switch(
         script: ScriptPtr,
         choice: ExternRef<TurnChoice>,
         out: *mut bool,
-    ) {
+    ) -> WasmVoidResult {
-        script.val().unwrap().prevent_opponent_switch(choice.not_null(), out.as_mut().unwrap());
+        WasmVoidResult::from_res(script.val().unwrap().prevent_opponent_switch(choice.not_null(), out.as_mut().unwrap()))
     }
 
     fn script_on_fail(
         script: ScriptPtr,
         pokemon: ExternRef<PokemonImpl>,
-    ) {
+    ) -> WasmVoidResult {
-        script.val().unwrap().on_fail(pokemon.not_null_rc());
+        WasmVoidResult::from_res(script.val().unwrap().on_fail(pokemon.not_null_rc()))
     }
 
     fn script_on_opponent_fail(
         script: ScriptPtr,
         pokemon: ExternRef<PokemonImpl>,
-    ) {
+    ) -> WasmVoidResult {
-        script.val().unwrap().on_opponent_fail(pokemon.not_null_rc());
+        WasmVoidResult::from_res(script.val().unwrap().on_opponent_fail(pokemon.not_null_rc()))
     }
 
     fn script_prevent_self_run_away(
         script: ScriptPtr,
         choice: ExternRef<TurnChoice>,
         out: *mut bool,
-    ) {
+    ) -> WasmVoidResult {
-        script.val().unwrap().prevent_self_run_away(choice.not_null(), out.as_mut().unwrap());
+        WasmVoidResult::from_res(script.val().unwrap().prevent_self_run_away(choice.not_null(), out.as_mut().unwrap()))
     }
 
     fn script_prevent_opponent_run_away(
         script: ScriptPtr,
         choice: ExternRef<TurnChoice>,
         out: *mut bool,
-    ) {
+    ) -> WasmVoidResult {
-        script.val().unwrap().prevent_opponent_run_away(choice.not_null(), out.as_mut().unwrap());
+        WasmVoidResult::from_res(script.val().unwrap().prevent_opponent_run_away(choice.not_null(), out.as_mut().unwrap()))
     }
 
     fn script_on_end_turn(
         script: ScriptPtr,
-    ) {
+    ) -> WasmVoidResult {
-        script.val().unwrap().on_end_turn();
+        WasmVoidResult::from_res(script.val().unwrap().on_end_turn())
     }
 
     fn script_on_damage(
@@ -605,31 +618,31 @@ mod implementation {
         source: DamageSource,
         old_health: u32,
         new_health: u32,
-    ) {
+    ) -> WasmVoidResult {
-        script.val().unwrap().on_damage(pokemon.not_null_rc(), source, old_health, new_health);
+        WasmVoidResult::from_res(script.val().unwrap().on_damage(pokemon.not_null_rc(), source, old_health, new_health))
     }
 
     fn script_on_faint(
         script: ScriptPtr,
         pokemon: ExternRef<PokemonImpl>,
         source: DamageSource,
-    ) {
+    ) -> WasmVoidResult {
-        script.val().unwrap().on_faint(pokemon.not_null_rc(), source);
+        WasmVoidResult::from_res(script.val().unwrap().on_faint(pokemon.not_null_rc(), source))
     }
 
     fn script_on_switch_in(
         script: ScriptPtr,
         pokemon: ExternRef<PokemonImpl>,
-    ) {
+    ) -> WasmVoidResult {
-        script.val().unwrap().on_switch_in(pokemon.not_null_rc());
+        WasmVoidResult::from_res(script.val().unwrap().on_switch_in(pokemon.not_null_rc()))
     }
 
     fn script_on_after_held_item_consume(
         script: ScriptPtr,
         pokemon: ExternRef<PokemonImpl>,
         item: ExternRef<ItemImpl>
-    ) {
+    ) -> WasmVoidResult {
-        script.val().unwrap().on_after_held_item_consume(pokemon.not_null_rc(), item.not_null_rc());
+        WasmVoidResult::from_res(script.val().unwrap().on_after_held_item_consume(pokemon.not_null_rc(), item.not_null_rc()))
     }
 
     fn script_change_experience_gained(
@@ -637,8 +650,12 @@ mod implementation {
         fainted_pokemon: ExternRef<PokemonImpl>,
         winning_pokemon: ExternRef<PokemonImpl>,
         out: *mut u32
-    ) {
+    ) -> WasmVoidResult {
-        script.val().unwrap().change_experience_gained(fainted_pokemon.not_null_rc(), winning_pokemon.not_null_rc(), out.as_mut().unwrap());
+        WasmVoidResult::from_res(script.val().unwrap().change_experience_gained(
+                fainted_pokemon.not_null_rc(),
+                winning_pokemon.not_null_rc(),
+                out.as_mut().unwrap()
+        ))
     }
 
     fn script_share_experience(
@@ -646,16 +663,20 @@ mod implementation {
         fainted_pokemon: ExternRef<PokemonImpl>,
         winning_pokemon: ExternRef<PokemonImpl>,
         out: *mut bool,
-    ) {
+    ) -> WasmVoidResult {
-        script.val().unwrap().share_experience(fainted_pokemon.not_null_rc(), winning_pokemon.not_null_rc(), out.as_mut().unwrap());
+        WasmVoidResult::from_res(script.val().unwrap().share_experience(
+                fainted_pokemon.not_null_rc(),
+                winning_pokemon.not_null_rc(),
+                out.as_mut().unwrap()
+        ))
     }
 
     fn script_block_weather(
         script: ScriptPtr,
         battle: ExternRef<BattleImpl>,
         out: *mut bool,
-    ) {
+    ) -> WasmVoidResult {
-        script.val().unwrap().block_weather(battle.not_null_rc(), out.as_mut().unwrap());
+        WasmVoidResult::from_res(script.val().unwrap().block_weather(battle.not_null_rc(), out.as_mut().unwrap()))
     }
 
     fn script_change_capture_rate_bonus(
@@ -663,8 +684,12 @@ mod implementation {
         target: ExternRef<PokemonImpl>,
         pokeball: ExternRef<ItemImpl>,
         out: *mut u8,
-    ) {
+    ) -> WasmVoidResult {
-        script.val().unwrap().change_capture_rate_bonus(target.not_null_rc(), pokeball.not_null_rc(), out.as_mut().unwrap());
+        WasmVoidResult::from_res(script.val().unwrap().change_capture_rate_bonus(
+                target.not_null_rc(),
+                pokeball.not_null_rc(),
+                out.as_mut().unwrap()
+        ))
     }
     }
 }

pkmn_lib_interface/src/result.rs

@@ -0,0 +1,49 @@
+use alloc::string::{String, ToString};
+use core::fmt;
+use core::fmt::{Debug, Display, Formatter};
+use cstr_core::CString;
+
+pub type PkmnResult<T> = Result<T, PkmnErr>;
+
+pub struct PkmnErr {
+    pub file: &'static str,
+    pub line: u32,
+    pub message: String,
+}
+
+impl PkmnErr {
+    pub fn new(file: &'static str, line: u32, message: String) -> Self {
+        Self {
+            file,
+            line,
+            message,
+        }
+    }
+}
+
+impl Debug for PkmnErr {
+    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
+        write!(f, "PkmnErr: {}:{}: {}", self.file, self.line, self.message)
+    }
+}
+
+impl Display for PkmnErr {
+    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
+        write!(f, "PkmnErr: {}:{}: {}", self.file, self.line, self.message)
+    }
+}
+
+impl From<PkmnErr> for CString {
+    fn from(val: PkmnErr) -> Self {
+        CString::new(val.to_string()).unwrap()
+    }
+}
+
+#[macro_export]
+macro_rules! pkmn_err {
+    ($message: expr) => {
+        PkmnErr::new(file!(), line!(), $message.to_string())
+    };
+}
+
+pub use pkmn_err;

pkmn_lib_interface/src/utils.rs

@@ -1,8 +1,23 @@
 use alloc::boxed::Box;
 
+#[macro_export]
+#[cfg(feature = "mock_data")]
+macro_rules! println {
+    ($($args:tt)*) => {};
+}
+
 #[macro_export]
 #[cfg(not(feature = "mock_data"))]
-macro_rules! println { ($($args:tt)*) => { crate::utils::print_raw(alloc::format!($($args)*).as_bytes()); } }
+macro_rules! println { ($($args:tt)*) => { pkmn_lib_interface::utils::print_raw(alloc::format!($($args)*).as_bytes()); } }
+
+#[cfg(not(feature = "mock_data"))]
+#[allow(unused_macros)]
+macro_rules! println_crate { ($($args:tt)*) => { crate::utils::print_raw(alloc::format!($($args)*).as_bytes()); } }
+
+#[cfg(not(feature = "mock_data"))]
+#[allow(unused_macros)]
+#[allow(unused_imports)]
+pub(crate) use println_crate;
 
 #[macro_export]
 #[cfg(not(feature = "mock_data"))]
@@ -18,13 +33,14 @@ macro_rules! dbg {
 #[cfg(not(feature = "mock_data"))]
 mod implementation {
     use alloc::alloc::alloc;
+    use alloc::string::ToString;
     use core::alloc::Layout;
     use core::panic::PanicInfo;
     use cstr_core::{c_char, CString};
 
     extern "wasm" {
         fn _print(s: *const u8);
-        fn _error(message: *const u8, file: *const u8, line: u32, position: u32);
+        fn _error(message: *const u8);
     }
 
     #[cfg(not(feature = "mock_data"))]
@@ -40,18 +56,11 @@ mod implementation {
     #[cfg(not(feature = "mock_data"))]
     #[cfg(not(test))]
     pub fn begin_panic_handler(panic_info: &PanicInfo<'_>) -> ! {
-        let msg = CString::new(panic_info.message().unwrap().as_str().unwrap()).unwrap();
+        let payload = panic_info.to_string();
-        let mut line = 0;
+        let msg = CString::new(payload.as_bytes()).unwrap();
-        let mut position = 0;
-        let mut file = CString::default();
-        if let Some(s) = panic_info.location() {
-            line = s.line();
-            position = s.column();
-            file = CString::new(s.file()).unwrap();
-        }
 
         unsafe {
-            _error(msg.as_ptr(), file.as_ptr(), line, position);
+            _error(msg.as_ptr());
         }
         loop {}
     }