Initial work on wasm scripting backend

Cargo.toml

@@ -12,9 +12,10 @@ crate_type = ["rlib"]
 path = "src/lib.rs"
 
 [features]
-c_interface = []
+ffi = []
 serde = ["dep:serde"]
-default = ["serde"]
+wasm = ["dep:wasmer", "dep:unique-type-id", "dep:unique-type-id-derive"]
+default = ["serde", "wasm"]
 
 [profile.dev]
 opt-level = 0
@@ -50,7 +51,11 @@ rand_pcg = "0.3.1"
 hashbrown = "0.12.1"
 indexmap = "1.8.2"
 parking_lot = "0.12.1"
+conquer-once = "0.3.2"
 serde = { version = "1.0.137", optional = true, features = ["derive"] }
+wasmer = { version = "2.3.0", optional = true, default-features = false, features = ["default-cranelift", "universal", "experimental-reference-types-extern-ref"] }
+unique-type-id = { version = "1.0.0", optional = true }
+unique-type-id-derive = { version = "1.0.0", optional = true }
 
 [dev-dependencies]
 csv = "1.1.6"

src/dynamic_data/libraries/dynamic_library.rs

@@ -1,4 +1,3 @@
-use std::ffi::c_void;
 use std::ops::Deref;
 use std::sync::Arc;
 
@@ -15,6 +14,7 @@ use crate::{PkmnResult, StringKey};
 /// The dynamic library stores a static data library, as well as holding different libraries and
 /// calculators that might be customized between different generations and implementations.
 #[derive(Debug)]
+#[cfg_attr(feature = "wasm", derive(unique_type_id_derive::UniqueTypeId))]
 pub struct DynamicLibrary {
     /// The static data is the immutable storage data for this library.
     static_data: StaticData,
@@ -75,7 +75,7 @@ impl DynamicLibrary {
     /// can be created with this combination, returns None.
     pub fn load_script(
         &self,
-        owner: *const c_void,
+        owner: *const u8,
         _category: ScriptCategory,
         _key: &StringKey,
     ) -> PkmnResult<Option<Arc<dyn Script>>> {

src/dynamic_data/libraries/script_resolver.rs

@@ -1,4 +1,3 @@
-use std::ffi::c_void;
 use std::fmt::Debug;
 use std::sync::Arc;
 
@@ -14,7 +13,7 @@ pub trait ScriptResolver: Debug {
     /// can be created with this combination, returns None.
     fn load_script(
         &self,
-        owner: *const c_void,
+        owner: *const u8,
         category: ScriptCategory,
         script_key: &StringKey,
     ) -> PkmnResult<Option<Arc<dyn Script>>>;
@@ -29,7 +28,8 @@ pub trait ScriptResolver: Debug {
 /// the same name, but a different script. It should be completely valid for a move to have the same
 /// name as an ability, or more commonly: for a script attached to a Pokemon to have the same name as
 /// a move that placed it there.
-#[derive(Debug, Clone)]
+#[derive(Debug, Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
+#[repr(u8)]
 pub enum ScriptCategory {
     /// A script that belongs to a move. This generally is only the script that is attached to a
     /// [`MoveChoice`](crate::dynamic_data::MoveChoice) and [`ExecutingMove`](crate::dynamic_data::ExecutingMove)
@@ -58,7 +58,7 @@ pub struct EmptyScriptResolver {}
 impl ScriptResolver for EmptyScriptResolver {
     fn load_script(
         &self,
-        _owner: *const c_void,
+        _owner: *const u8,
         _category: ScriptCategory,
         _script_key: &StringKey,
     ) -> PkmnResult<Option<Arc<dyn Script>>> {

src/lib.rs

@@ -9,6 +9,8 @@
 #![feature(once_cell)]
 #![feature(const_option)]
 #![feature(is_some_with)]
+#![feature(core_ffi_c)]
+#![feature(new_uninit)]
 
 //! PkmnLib
 //! PkmnLib is a full featured implementation of Pokemon. while currently focused on implementing
@@ -27,6 +29,8 @@ pub mod defines;
 /// The dynamic data module holds data that can change during execution, and things that relate to
 /// this. This includes things as Pokemon themselves, battles, etc.
 pub mod dynamic_data;
+/// Script implementations handles the different ways that dynamic scripts get loaded during battle.
+pub mod script_implementations;
 /// The static data module holds data that can be set once, and then never change. This includes
 /// things such as data about Pokemon species, data about items, etc.
 pub mod static_data;

src/script_implementations/mod.rs

@@ -0,0 +1,3 @@
+/// The WASM module handles loading dynamic scripts through WebAssembly.
+#[cfg(feature = "wasm")]
+pub mod wasm;

src/script_implementations/wasm/export_registry/mod.rs

@@ -0,0 +1,103 @@
+use core::ffi::c_char;
+use std::borrow::Cow;
+use std::ffi::CString;
+use std::mem::{align_of, size_of};
+
+use wasmer::wasmparser::Data;
+use wasmer::{Exports, Function, Store};
+
+use crate::dynamic_data::DynamicLibrary;
+use crate::script_implementations::wasm::extern_ref::ExternRef;
+use crate::script_implementations::wasm::script_resolver::WebAssemblyEnv;
+use crate::static_data::{DataLibrary, MoveData, MoveLibrary, StaticData};
+use crate::StringKey;
+
+macro_rules! register_func {
+    ($exports: ident, $store: ident, $func: ident) => {
+        $exports.insert(stringify!($func), Function::new_native($store, $func));
+    };
+}
+
+macro_rules! register_func_with_env {
+    ($exports: ident, $store: ident, $func: ident, $env: expr) => {
+        $exports.insert(
+            stringify!($func),
+            Function::new_native_with_env($store, $env.clone(), $func),
+        );
+    };
+}
+
+pub(crate) fn register_webassembly_funcs(exports: &mut Exports, store: &Store, env: WebAssemblyEnv) {
+    register_func_with_env!(exports, store, _print, env);
+    register_func_with_env!(exports, store, _error, env);
+    register_func_with_env!(exports, store, move_library_get_move_by_hash, env);
+    register_func_with_env!(exports, store, move_data_get_name, env);
+    register_func_with_env!(exports, store, move_data_get_base_power, env);
+    register_func_with_env!(exports, store, const_string_get_hash, env);
+    register_func_with_env!(exports, store, const_string_get_str, env);
+    register_func_with_env!(exports, store, battle_library_get_data_library, env);
+    register_func_with_env!(exports, store, data_library_get_move_library, env);
+}
+
+fn _print(env: &WebAssemblyEnv, p: u32, len: u32) {
+    unsafe {
+        let mem: *mut u8 = env.resolver().memory().data_ptr().offset(p as isize);
+        let s = String::from_raw_parts(mem, len as usize, len as usize);
+        println!("{}", s);
+    }
+}
+
+fn _error(env: &WebAssemblyEnv, message: u32, message_len: u32, file: u32, file_len: u32, line: u32, position: u32) {
+    unsafe {
+        let mem: *mut u8 = env.resolver().memory().data_ptr().offset(message as isize);
+        let message = String::from_raw_parts(mem, message_len as usize, message_len as usize);
+        let mem: *mut u8 = env.resolver().memory().data_ptr().offset(file as isize);
+        let file = String::from_raw_parts(mem, file_len as usize, file_len as usize);
+        println!("Error: {} in file {}, line: {}:{}", message, file, line, position);
+    }
+}
+
+fn move_library_get_move_by_hash(env: &WebAssemblyEnv, lib: ExternRef<MoveLibrary>, hash: u32) -> ExternRef<MoveData> {
+    let lib = lib.value(env);
+    let m = lib.get_by_hash(hash);
+    if let Some(v) = m {
+        ExternRef::new(env, v)
+    } else {
+        ExternRef::null()
+    }
+}
+
+fn move_data_get_name(env: &WebAssemblyEnv, move_data: ExternRef<MoveData>) -> ExternRef<StringKey> {
+    let move_data = move_data.value(env);
+    ExternRef::new(env, move_data.name())
+}
+
+fn move_data_get_base_power(env: &WebAssemblyEnv, move_data: ExternRef<MoveData>) -> u8 {
+    move_data.value(env).base_power()
+}
+
+fn const_string_get_hash(env: &WebAssemblyEnv, string_key: ExternRef<StringKey>) -> u32 {
+    string_key.value(env).hash()
+}
+
+fn const_string_get_str(env: &WebAssemblyEnv, string_key: ExternRef<StringKey>) -> u32 {
+    let string_key = string_key.value(env).str();
+    let mut s: CString = CString::new(string_key.as_bytes()).unwrap();
+    let wasm_string_ptr = env
+        .resolver()
+        .allocate_mem(string_key.len() as u32, align_of::<CString>() as u32);
+    let mut wasm_string = unsafe { CString::from_raw(wasm_string_ptr.0 as *mut c_char) };
+    s.clone_into(&mut wasm_string);
+    wasm_string_ptr.1
+}
+
+fn battle_library_get_data_library(
+    env: &WebAssemblyEnv,
+    dynamic_lib: ExternRef<DynamicLibrary>,
+) -> ExternRef<StaticData> {
+    ExternRef::new(env, dynamic_lib.value(env).static_data())
+}
+
+fn data_library_get_move_library(env: &WebAssemblyEnv, data_library: ExternRef<StaticData>) -> ExternRef<MoveLibrary> {
+    ExternRef::new(env, data_library.value(env).moves())
+}

src/script_implementations/wasm/extern_ref.rs

@@ -0,0 +1,54 @@
+use std::marker::PhantomData;
+
+use unique_type_id::UniqueTypeId;
+use wasmer::FromToNativeWasmType;
+
+use crate::script_implementations::wasm::script_resolver::WebAssemblyEnv;
+
+pub(crate) struct ExternRef<T: UniqueTypeId<u64>> {
+    index: u32,
+    _phantom: PhantomData<T>,
+}
+
+impl<T: UniqueTypeId<u64>> ExternRef<T> {
+    pub fn new(env: &WebAssemblyEnv, value: &T) -> Self {
+        Self {
+            index: env.resolver().get_extern_ref_index(value),
+            _phantom: Default::default(),
+        }
+    }
+
+    pub fn from_index(index: u32) -> Self {
+        Self {
+            index,
+            _phantom: Default::default(),
+        }
+    }
+
+    pub fn null() -> Self {
+        Self {
+            index: 0,
+            _phantom: Default::default(),
+        }
+    }
+
+    pub fn value<'a, 'b>(&'a self, env: &'b WebAssemblyEnv) -> &'b T {
+        let ptr = env.resolver().get_extern_ref_value(self.index) as *const T;
+        unsafe { ptr.as_ref().unwrap() }
+    }
+}
+
+unsafe impl<T: UniqueTypeId<u64>> FromToNativeWasmType for ExternRef<T> {
+    type Native = i32;
+
+    fn from_native(native: Self::Native) -> Self {
+        Self {
+            index: native as u32,
+            _phantom: Default::default(),
+        }
+    }
+
+    fn to_native(self) -> Self::Native {
+        self.index as i32
+    }
+}

src/script_implementations/wasm/mod.rs

@@ -0,0 +1,70 @@
+/// The export registry module deals with registering all functions we require in WebAssembly.
+mod export_registry;
+pub(crate) mod extern_ref;
+/// The script module deals with the actual running of WASM functions.
+pub mod script;
+/// The script resolver deals with the loading of scripts.
+pub mod script_resolver;
+
+/// The WebAssemblyScriptCapabilities define which functions are implemented on a script. This allows
+/// us to not call a function if we do not need to.
+#[derive(Debug, Copy, Clone, Ord, PartialOrd, Eq, PartialEq, Hash)]
+#[allow(missing_docs)]
+pub enum WebAssemblyScriptCapabilities {
+    None = 0,
+    Initialize = 1,
+    OnStack,
+    OnRemove,
+    OnBeforeTurn,
+    ChangeAttack,
+    ModifyNumberOfHits,
+    PreventAttack,
+    FailAttack,
+    StopBeforeAttack,
+    OnBeforeAttack,
+    FailIncomingAttack,
+    IsInvulnerable,
+    OnAttackMiss,
+    ChangeAttackType,
+    ChangeEffectiveness,
+    BlockCritical,
+    OnIncomingHit,
+    OnFaintingOpponent,
+    PreventStatBoostChange,
+    ModifyStatBoostChange,
+    PreventSecondaryEffects,
+    OnSecondaryEffect,
+    OnAfterHits,
+    PreventSelfSwitch,
+    ModifyEffectChance,
+    ModifyIncomingEffectChance,
+    OverrideBasePower,
+    ChangeDamageStatsUser,
+    BypassDefensiveStat,
+    BypassOffensiveStat,
+    ModifyStatModifier,
+    ModifyDamageModifier,
+    OverrideDamage,
+    OverrideIncomingDamage,
+    ChangeSpeed,
+    ChangePriority,
+    OnFail,
+    OnOpponentFail,
+    PreventRunAway,
+    PreventOpponentRunAway,
+    PreventOpponentSwitch,
+    OnEndTurn,
+    OnDamage,
+    OnFaint,
+    OnAfterHeldItemConsume,
+    PreventIncomingCritical,
+    ModifyCriticalStage,
+    OverrideCriticalModifier,
+    OverrideSTABModifier,
+    ModifyExperienceGain,
+    DoesShareExperience,
+    BlockWeather,
+    OnSwitchIn,
+    ModifyOffensiveStatValue,
+    ModifyDefensiveStatValue,
+}

src/script_implementations/wasm/script.rs

@@ -0,0 +1,73 @@
+use std::any::Any;
+use std::sync::atomic::{AtomicBool, AtomicPtr, AtomicUsize};
+
+use hashbrown::HashSet;
+
+use crate::dynamic_data::Script;
+use crate::script_implementations::wasm::script_resolver::WebAssemblyScriptResolver;
+use crate::script_implementations::wasm::WebAssemblyScriptCapabilities;
+use crate::StringKey;
+
+/// A WebAssemblyScript is there to implement the Script trait within WebAssemblyScript.
+pub struct WebAssemblyScript {
+    /// The unique identifier of the script.
+    name: StringKey,
+    /// Returns an atomic bool for internal marking of deletion. This is currently only specifically
+    /// used for deletion of a script while we are holding a reference to it (i.e. executing a script
+    /// hook on it).
+    marked_for_deletion: AtomicBool,
+    /// A script can be suppressed by other scripts. If a script is suppressed by at least one script
+    /// we will not execute its methods. This holds the number of suppressions on the script.
+    suppressed_count: AtomicUsize,
+    /// The owner of this script (where the script is attached to)
+    owner_ptr: AtomicPtr<u8>,
+    /// Pointer inside WebAssembly memory where the data is for this script.
+    self_ptr: u32,
+    /// Capabilities define which functions we actually implement.
+    capabilities: AtomicPtr<HashSet<WebAssemblyScriptCapabilities>>,
+    /// A reference back to our resolver.
+    resolver: AtomicPtr<WebAssemblyScriptResolver>,
+}
+
+impl WebAssemblyScript {
+    /// Instantiates a new WebAssemblyScript.
+    pub fn new(
+        owner_ptr: *mut u8,
+        self_ptr: u32,
+        capabilities: *mut HashSet<WebAssemblyScriptCapabilities>,
+        resolver: *mut WebAssemblyScriptResolver,
+        name: StringKey,
+    ) -> Self {
+        Self {
+            name,
+            marked_for_deletion: Default::default(),
+            suppressed_count: Default::default(),
+            owner_ptr: AtomicPtr::new(owner_ptr),
+            self_ptr,
+            capabilities: AtomicPtr::new(capabilities),
+            resolver: AtomicPtr::new(resolver),
+        }
+    }
+}
+
+impl Script for WebAssemblyScript {
+    fn name(&self) -> &StringKey {
+        &self.name
+    }
+
+    fn get_marked_for_deletion(&self) -> &AtomicBool {
+        &self.marked_for_deletion
+    }
+
+    fn get_suppressed_count(&self) -> &AtomicUsize {
+        &self.suppressed_count
+    }
+
+    fn as_any(&self) -> &dyn Any {
+        self
+    }
+
+    fn as_any_mut(&mut self) -> &mut dyn Any {
+        self
+    }
+}

src/script_implementations/wasm/script_capabilities.rs

@@ -0,0 +1 @@
+

src/script_implementations/wasm/script_resolver.rs

@@ -0,0 +1,253 @@
+use std::any::{Any, TypeId};
+use std::fmt::{Debug, Formatter};
+use std::pin::Pin;
+use std::sync::Arc;
+
+use hashbrown::{HashMap, HashSet};
+use parking_lot::RwLock;
+use unique_type_id::UniqueTypeId;
+use wasmer::{
+    Cranelift, Exports, Extern, Features, Function, ImportObject, Instance, Memory, Module, NativeFunc, Store,
+    Universal, UniversalEngine, Value, WasmerEnv,
+};
+
+use crate::dynamic_data::{ItemScript, Script, ScriptResolver};
+use crate::script_implementations::wasm::export_registry::register_webassembly_funcs;
+use crate::script_implementations::wasm::extern_ref::ExternRef;
+use crate::script_implementations::wasm::script::WebAssemblyScript;
+use crate::script_implementations::wasm::WebAssemblyScriptCapabilities;
+use crate::static_data::Item;
+use crate::{PkmnResult, ScriptCategory, StringKey};
+
+/// A WebAssembly script resolver implements the dynamic scripts functionality with WebAssembly.
+pub struct WebAssemblyScriptResolver {
+    engine: UniversalEngine,
+    store: Store,
+    module: Option<Module>,
+    instance: Option<Instance>,
+    memory: Option<Memory>,
+    imports: HashMap<String, Function>,
+    exports: Exports,
+    exported_functions: HashMap<StringKey, Function>,
+    load_script_fn: Option<NativeFunc<(u8, ExternRef<StringKey>), u32>>,
+    allocate_mem_fn: Option<NativeFunc<(u32, u32), u32>>,
+    script_capabilities: RwLock<HashMap<ScriptCapabilitiesKey, HashSet<WebAssemblyScriptCapabilities>>>,
+
+    extern_ref_pointers: RwLock<Vec<*const u8>>,
+    extern_ref_pointers_lookup: RwLock<HashMap<*const u8, u32>>,
+    extern_ref_type_lookup: RwLock<HashMap<*const u8, u64>>,
+}
+
+#[derive(Debug, Clone, Eq, PartialEq, Hash)]
+struct ScriptCapabilitiesKey {
+    category: ScriptCategory,
+    script_key: StringKey,
+}
+
+impl WebAssemblyScriptResolver {
+    /// Instantiates a new WebAssemblyScriptResolver.
+    pub fn new() -> Self {
+        let config = Cranelift::default();
+        let mut features = Features::new();
+        features.multi_value = true;
+        features.reference_types = true;
+        let universal = Universal::new(config).features(features);
+        let engine = universal.engine();
+        let store = Store::new(&engine);
+        Self {
+            engine,
+            store,
+            module: Default::default(),
+            instance: Default::default(),
+            memory: Default::default(),
+            imports: Default::default(),
+            exports: Default::default(),
+            exported_functions: Default::default(),
+            load_script_fn: None,
+            allocate_mem_fn: None,
+            script_capabilities: Default::default(),
+            extern_ref_pointers: Default::default(),
+            extern_ref_pointers_lookup: Default::default(),
+            extern_ref_type_lookup: Default::default(),
+        }
+    }
+
+    /// Load a compiled WASM module.
+    pub fn load_wasm_from_bytes(&mut self, bytes: &[u8]) {
+        // FIXME: Error handling
+        let module = Module::new(&self.store, bytes).unwrap();
+        self.module = Some(module);
+
+        self.finalize();
+    }
+
+    /// Initialise all the data we need.
+    fn finalize(&mut self) {
+        let mut imports = ImportObject::new();
+        let mut exports = Exports::new();
+
+        let env = WebAssemblyEnv {
+            resolver: self as *const WebAssemblyScriptResolver,
+        };
+        register_webassembly_funcs(&mut exports, &self.store, env);
+        imports.register("env", exports);
+
+        self.instance = Some(Instance::new(&self.module.as_ref().unwrap(), &imports).unwrap());
+        let exports = &self.instance.as_ref().unwrap().exports;
+        for export in exports.iter() {
+            match export.1 {
+                Extern::Function(f) => {
+                    self.exported_functions.insert(export.0.as_str().into(), f.clone());
+                }
+                Extern::Memory(m) => {
+                    self.memory = Some(m.clone());
+                }
+                _ => {}
+            }
+        }
+        if let Some(m) = &self.memory {
+            m.grow(32).unwrap();
+        }
+        if let Some(f) = self.exported_functions.get(&"load_script".into()) {
+            self.load_script_fn = Some(f.native().unwrap())
+        }
+        if let Some(f) = self.exported_functions.get(&"allocate_mem".into()) {
+            self.allocate_mem_fn = Some(f.native().unwrap())
+        }
+    }
+
+    /// Gets the internal WASM memory.
+    pub fn memory(&self) -> &Memory {
+        self.memory.as_ref().unwrap()
+    }
+
+    /// Get a numeric value from any given value. This is not a true Extern Ref from WASM, as this
+    /// is not supported by our current WASM platform (Rust). Instead, this is simply a way to not
+    /// have to send arbitrary pointer values back and forth with WASM. Only values WASM can actually
+    /// access can be touched through this, and we ensure the value is the correct type. In the future,
+    /// when extern refs get actually properly implemented at compile time we might want to get rid
+    /// of this code.
+    pub fn get_extern_ref_index<T: UniqueTypeId<u64>>(&self, value: &T) -> u32 {
+        let ptr = value as *const T as *const u8;
+        if let Some(v) = self.extern_ref_pointers_lookup.read().get(&ptr) {
+            return *v as u32;
+        }
+        let index = {
+            let mut extern_ref_guard = self.extern_ref_pointers.write();
+            extern_ref_guard.push(ptr);
+            extern_ref_guard.len() as u32
+        };
+        self.extern_ref_pointers_lookup.write().insert(ptr, index);
+        self.extern_ref_type_lookup.write().insert(ptr, T::id().0);
+        index
+    }
+
+    /// Gets a value from the extern ref lookup. This turns an earlier registered index back into
+    /// its proper value, validates its type, and returns the value.
+    pub fn get_extern_ref_value<T: UniqueTypeId<u64>>(&self, index: u32) -> &T {
+        let read_guard = self.extern_ref_pointers.read();
+        let ptr = read_guard.get(index as usize).unwrap();
+        let expected_type_id = self.extern_ref_type_lookup.read()[&ptr];
+        if expected_type_id != T::id().0 {
+            panic!("Extern ref was accessed with wrong type");
+        }
+
+        unsafe { (*ptr as *const T).as_ref().unwrap() }
+    }
+
+    /// Allocates memory inside the WASM container with a given size and alignment. This memory is
+    /// owned by WASM, and is how we can pass memory references that the host allocated to WASM.
+    /// The return is a tuple containing both the actual pointer to the memory (usable by the host),
+    /// and the WASM offset to the memory (usable by the client).
+    pub fn allocate_mem(&self, size: u32, align: u32) -> (*const u8, u32) {
+        let wasm_ptr = self.allocate_mem_fn.as_ref().unwrap().call(size, align).unwrap();
+        unsafe {
+            (
+                self.memory.as_ref().unwrap().data_ptr().offset(wasm_ptr as isize),
+                wasm_ptr,
+            )
+        }
+    }
+}
+
+impl ScriptResolver for WebAssemblyScriptResolver {
+    fn load_script(
+        &self,
+        owner: *const u8,
+        category: ScriptCategory,
+        script_key: &StringKey,
+    ) -> PkmnResult<Option<Arc<dyn Script>>> {
+        let script = self
+            .load_script_fn
+            .as_ref()
+            .unwrap()
+            .call(
+                category as u8,
+                ExternRef::from_index(self.get_extern_ref_index(script_key)),
+            )
+            .unwrap();
+        if script == 0 {
+            return Ok(None);
+        }
+
+        let key = ScriptCapabilitiesKey {
+            category,
+            script_key: script_key.clone(),
+        };
+
+        if !self.script_capabilities.read().contains_key(&key) {
+            let mut capabilities = HashSet::new();
+            unsafe {
+                if let Some(get_cap) = self.exported_functions.get(&"get_script_capabilities".into()) {
+                    let res = get_cap.call(&[Value::I32(script as i32)]).unwrap();
+                    let ptr = (self.memory.as_ref().unwrap().data_ptr() as *const WebAssemblyScriptCapabilities)
+                        .offset(res[0].i32().unwrap() as isize);
+                    let length = res[1].i32().unwrap() as usize;
+                    for i in 0..length {
+                        capabilities.insert(*ptr.offset(i as isize));
+                    }
+                }
+            }
+            self.script_capabilities.write().insert(key.clone(), capabilities);
+        }
+
+        let read_guard = self.script_capabilities.read();
+        let capabilities = read_guard.get(&key).unwrap();
+
+        Ok(Some(Arc::new(WebAssemblyScript::new(
+            owner as *mut u8,
+            script,
+            capabilities as *const HashSet<WebAssemblyScriptCapabilities>
+                as *mut HashSet<WebAssemblyScriptCapabilities>,
+            self as *const WebAssemblyScriptResolver as *mut WebAssemblyScriptResolver,
+            script_key.clone(),
+        ))))
+    }
+
+    fn load_item_script(&self, _key: &Item) -> PkmnResult<Option<Arc<dyn ItemScript>>> {
+        todo!()
+    }
+}
+
+impl Debug for WebAssemblyScriptResolver {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        f.write_str("WebAssemblyScriptResolver")
+    }
+}
+
+#[derive(Clone)]
+pub(crate) struct WebAssemblyEnv {
+    pub resolver: *const WebAssemblyScriptResolver,
+}
+
+impl WebAssemblyEnv {
+    pub fn resolver(&self) -> &WebAssemblyScriptResolver {
+        unsafe { self.resolver.as_ref().unwrap() }
+    }
+}
+
+unsafe impl Sync for WebAssemblyEnv {}
+
+unsafe impl Send for WebAssemblyEnv {}
+
+impl WasmerEnv for WebAssemblyEnv {}

src/static_data/libraries/data_library.rs

@@ -26,6 +26,11 @@ pub trait DataLibrary<'a, T: 'a> {
         self.map().get::<StringKey>(key)
     }
 
+    /// Gets a value from the library.
+    fn get_by_hash(&'a self, key: u32) -> Option<&'a T> {
+        self.map().get::<u32>(&key)
+    }
+
     /// Gets a mutable value from the library.
     fn get_mut(&mut self, key: &StringKey) -> Option<&mut T> {
         self.get_modify().get_mut(key)

src/static_data/libraries/move_library.rs

@@ -6,6 +6,7 @@ use crate::StringKey;
 
 /// A library to store all data for moves.
 #[derive(Debug)]
+#[cfg_attr(feature = "wasm", derive(unique_type_id_derive::UniqueTypeId))]
 pub struct MoveLibrary {
     /// The underlying map.
     map: IndexMap<StringKey, MoveData>,

src/static_data/libraries/static_data.rs

@@ -9,6 +9,7 @@ use crate::static_data::TypeLibrary;
 
 /// The storage for all different libraries.
 #[derive(Debug)]
+#[cfg_attr(feature = "wasm", derive(unique_type_id_derive::UniqueTypeId))]
 pub struct StaticData {
     /// Several misc settings for the library.
     settings: LibrarySettings,

src/static_data/moves/move_data.rs

@@ -59,6 +59,7 @@ pub enum MoveTarget {
 
 /// A move is the skill Pokémon primarily use in battle. This is the data related to that.
 #[derive(PartialEq, Debug)]
+#[cfg_attr(feature = "wasm", derive(unique_type_id_derive::UniqueTypeId))]
 pub struct MoveData {
     /// The name of the move.
     name: StringKey,

src/static_data/species_data/species.rs

@@ -1,5 +1,3 @@
-use std::lazy::SyncLazy;
-
 use hashbrown::{HashMap, HashSet};
 
 use crate::static_data::Form;
@@ -28,7 +26,11 @@ pub struct Species {
 }
 
 /// A cached String Key to get the default form.
-static DEFAULT_KEY: SyncLazy<StringKey> = SyncLazy::new(|| StringKey::new("default"));
+static DEFAULT_KEY: conquer_once::OnceCell<StringKey> = conquer_once::OnceCell::uninit();
+
+fn get_default_key() -> StringKey {
+    DEFAULT_KEY.get_or_init(|| StringKey::new("default")).clone()
+}
 
 impl Species {
     /// Creates a new species.
@@ -42,7 +44,7 @@ impl Species {
         flags: HashSet<StringKey>,
     ) -> Species {
         let mut forms = HashMap::with_capacity(1);
-        forms.insert_unique_unchecked(DEFAULT_KEY.clone(), default_form);
+        forms.insert_unique_unchecked(get_default_key(), default_form);
         Species {
             id,
             name: name.clone(),
@@ -96,7 +98,7 @@ impl Species {
 
     /// Gets the form the Pokemon will have by default, if no other form is specified.
     pub fn get_default_form(&self) -> &Form {
-        self.forms.get(&DEFAULT_KEY).unwrap()
+        self.forms.get(&get_default_key()).unwrap()
     }
 
     /// Gets a random gender.

src/utils/string_key.rs

@@ -1,15 +1,17 @@
 use std::fmt::{Display, Formatter};
 use std::hash::{Hash, Hasher};
-use std::lazy::SyncLazy;
 use std::sync::{Arc, Mutex, Weak};
 
+use conquer_once::OnceCell;
 use hashbrown::HashMap;
+use indexmap::Equivalent;
 
 /// StringKey is an immutable string that is used for indexing of hashmaps or equality a lot.
 /// By reference counting the string instead of copying, and caching the hash, we can get some
 /// free speed out of it. Note that StringKeys also compare case insensitive, so that for example
 /// `charmander` == `Charmander`.
 #[derive(Clone, Debug)]
+#[cfg_attr(feature = "wasm", derive(unique_type_id_derive::UniqueTypeId))]
 pub struct StringKey {
     /// The underlying reference counted string.
     str: Arc<str>,
@@ -19,9 +21,9 @@ pub struct StringKey {
 
 /// A cache of all allocated strings. This allows us to re-use strings that are often used without
 /// allocation.
-static STRING_CACHE: SyncLazy<Mutex<HashMap<u32, Weak<str>>>> = SyncLazy::new(|| Mutex::new(HashMap::new()));
+static STRING_CACHE: OnceCell<Mutex<HashMap<u32, Weak<str>>>> = OnceCell::uninit();
 /// An empty StringKey
-static EMPTY: SyncLazy<StringKey> = SyncLazy::new(|| StringKey::new(""));
+static EMPTY: OnceCell<StringKey> = OnceCell::uninit();
 
 impl StringKey {
     /// Calculates the hash of a string key in a const manner.
@@ -49,7 +51,7 @@ impl StringKey {
     /// that value.
     pub fn new(s: &str) -> Self {
         let hash = StringKey::get_hash(s);
-        let mut cache = STRING_CACHE.lock().unwrap();
+        let mut cache = STRING_CACHE.get_or_init(|| Mutex::new(HashMap::new())).lock().unwrap();
         let cached_value = cache.get(&hash);
         if let Some(cached_value) = cached_value {
             if let Some(cached_value) = cached_value.upgrade() {
@@ -66,7 +68,7 @@ impl StringKey {
 
     /// Gets the empty StringKey.
     pub fn empty() -> Self {
-        EMPTY.clone()
+        EMPTY.get_or_init(|| StringKey::new("")).clone()
     }
 
     /// Gets the underlying string for the StringKey.
@@ -100,6 +102,12 @@ impl From<&str> for StringKey {
     }
 }
 
+impl Equivalent<StringKey> for u32 {
+    fn equivalent(&self, key: &StringKey) -> bool {
+        *self == key.hash
+    }
+}
+
 impl Display for StringKey {
     fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
         f.write_str(&*self.str)

tests/common/library_loader.rs

@@ -1,7 +1,7 @@
 use std::convert::TryFrom;
 use std::fmt::Debug;
 use std::fs::File;
-use std::io::Read;
+use std::io::{BufReader, Read};
 
 use hashbrown::HashSet;
 use num_traits::PrimInt;
@@ -13,6 +13,7 @@ use pkmn_lib::dynamic_data::Gen7BattleStatCalculator;
 use pkmn_lib::dynamic_data::Gen7DamageLibrary;
 use pkmn_lib::dynamic_data::Gen7MiscLibrary;
 use pkmn_lib::dynamic_data::{DynamicLibrary, EmptyScriptResolver};
+use pkmn_lib::script_implementations::wasm::script_resolver::WebAssemblyScriptResolver;
 use pkmn_lib::static_data::{
     Ability, AbilityLibrary, BattleItemCategory, DataLibrary, EffectParameter, Form, GrowthRateLibrary, Item,
     ItemLibrary, LearnableMoves, LibrarySettings, LookupGrowthRate, MoveData, MoveLibrary, Nature, NatureLibrary,
@@ -32,12 +33,15 @@ pub fn load_library() -> DynamicLibrary {
     load_abilities(&path, data.abilities_mut());
     load_moves(&path, &mut data);
     load_species(&path, &mut data);
+    let mut resolver = WebAssemblyScriptResolver::new();
+    load_wasm(&path, &mut resolver);
+
     let dynamic = DynamicLibrary::new(
         data,
         Box::new(Gen7BattleStatCalculator {}),
         Box::new(Gen7DamageLibrary::new(false)),
         Box::new(Gen7MiscLibrary::new()),
-        Box::new(EmptyScriptResolver {}),
+        Box::new(resolver),
     );
     dynamic
 }
@@ -271,6 +275,14 @@ pub fn load_species(path: &String, library: &mut StaticData) {
     }
 }
 
+fn load_wasm(path: &String, library: &mut WebAssemblyScriptResolver) {
+    let mut file = File::open(path.to_string() + "gen7_scripts_rs.wasm").unwrap();
+    let mut reader = BufReader::new(file);
+    let mut buffer = Vec::new();
+    reader.read_to_end(&mut buffer);
+    library.load_wasm_from_bytes(&buffer);
+}
+
 fn parse_form(name: StringKey, value: &Value, library: &mut StaticData) -> Form {
     let mut abilities = Vec::new();
     for a in value["abilities"].as_array().unwrap() {

tests/main.rs

@@ -4,27 +4,35 @@
 
 use std::fs::File;
 use std::io::Read;
-use std::lazy::SyncLazy;
 use std::path::Path;
 
-use pkmn_lib::dynamic_data::DynamicLibrary;
+use conquer_once::OnceCell;
+
+use pkmn_lib::dynamic_data::{DynamicLibrary, ScriptCategory};
 
 use crate::common::{library_loader, TestCase};
 
 pub mod common;
 
-static LIBRARY: SyncLazy<DynamicLibrary> = SyncLazy::new(|| {
-    let start_time = chrono::Utc::now();
-    let lib = library_loader::load_library();
-    let end_time = chrono::Utc::now();
-    println!("Built library in {} ms", (end_time - start_time).num_milliseconds());
-    lib
-});
+static LIBRARY: OnceCell<DynamicLibrary> = OnceCell::uninit();
+
+fn get_library<'a>() -> &'a DynamicLibrary {
+    LIBRARY.get_or_init(|| {
+        let start_time = chrono::Utc::now();
+        let lib = library_loader::load_library();
+        let end_time = chrono::Utc::now();
+        println!("Built library in {} ms", (end_time - start_time).num_milliseconds());
+        lib
+    })
+}
 
 #[test]
 #[cfg_attr(miri, ignore)]
 fn validate_library_load() {
-    SyncLazy::force(&LIBRARY);
+    let start_time = chrono::Utc::now();
+    let lib = library_loader::load_library();
+    let end_time = chrono::Utc::now();
+    println!("Built library in {} ms", (end_time - start_time).num_milliseconds());
 }
 
 #[datatest::files("tests/test_cases", {
@@ -37,5 +45,16 @@ fn integration_tests(input: &Path) {
     file.read_to_string(&mut str).unwrap();
     let test_case = serde_yaml::from_str::<TestCase>(&*str).unwrap();
     println!("\tRunning integration test {}", test_case.name);
-    test_case.run_test(&LIBRARY);
+    test_case.run_test(get_library());
+}
+
+#[test]
+#[cfg_attr(miri, ignore)]
+fn validate_script() {
+    let lib = library_loader::load_library();
+    let script = lib
+        .load_script(0 as *const u8, ScriptCategory::Move, &"test".into())
+        .unwrap()
+        .unwrap();
+    script.on_initialize(&[]);
 }

types.toml

@@ -0,0 +1,5 @@
+MoveLibrary = 0
+MoveData = 1
+StringKey = 2
+DynamicLibrary = 3
+StaticData = 4