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as_js.rs
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as_js.rs
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//use crate::js::externals::Function;
// use crate::store::{Store, StoreObject};
// use crate::js::RuntimeError;
use crate::imports::Imports;
use crate::instance::Instance;
use crate::js::instance::Instance as JsInstance;
use crate::js::vm::{VMFunction, VMGlobal, VMMemory, VMTable};
use crate::js::wasm_bindgen_polyfill::Global as JsGlobal;
use crate::store::{AsStoreMut, AsStoreRef};
use crate::value::Value;
use crate::Type;
use crate::{Extern, Function, Global, Memory, Table};
use js_sys::Function as JsFunction;
use js_sys::WebAssembly::{Memory as JsMemory, Table as JsTable};
use std::collections::HashMap;
use std::convert::TryInto;
use wasm_bindgen::JsCast;
use wasm_bindgen::{JsError, JsValue};
use wasmer_types::ExternType;
/// Convert the given type to a [`JsValue`].
pub trait AsJs: Sized {
/// The inner definition type from this Javascript object
type DefinitionType;
/// Convert the given type to a [`JsValue`].
fn as_jsvalue(&self, store: &impl AsStoreRef) -> JsValue;
/// Convert the given type to a [`JsValue`].
fn from_jsvalue(
store: &mut impl AsStoreMut,
type_: &Self::DefinitionType,
value: &JsValue,
) -> Result<Self, JsError>;
}
#[inline]
pub fn param_from_js(ty: &Type, js_val: &JsValue) -> Value {
match ty {
Type::I32 => Value::I32(js_val.as_f64().unwrap() as _),
Type::I64 => Value::I64(if js_val.is_bigint() {
js_val.clone().try_into().unwrap()
} else {
js_val.as_f64().unwrap() as _
}),
Type::F32 => Value::F32(js_val.as_f64().unwrap() as _),
Type::F64 => Value::F64(js_val.as_f64().unwrap()),
Type::V128 => {
let big_num: u128 = js_sys::BigInt::from(js_val.clone()).try_into().unwrap();
Value::V128(big_num)
}
Type::ExternRef | Type::FuncRef => unimplemented!(
"The type `{:?}` is not yet supported in the JS Function API",
ty
),
}
}
impl AsJs for Value {
type DefinitionType = Type;
fn as_jsvalue(&self, _store: &impl AsStoreRef) -> JsValue {
match self {
Self::I32(i) => JsValue::from(*i),
Self::I64(i) => JsValue::from(*i),
Self::F32(f) => JsValue::from(*f),
Self::F64(f) => JsValue::from(*f),
Self::V128(v) => JsValue::from(*v),
Self::FuncRef(Some(func)) => func.0.handle.function.clone().into(),
Self::FuncRef(None) => JsValue::null(),
Self::ExternRef(_) => unimplemented!(),
}
}
fn from_jsvalue(
_store: &mut impl AsStoreMut,
type_: &Self::DefinitionType,
value: &JsValue,
) -> Result<Self, JsError> {
Ok(param_from_js(type_, value))
}
}
impl AsJs for Imports {
type DefinitionType = crate::module::Module;
// Annotation is here to prevent spurious IDE warnings.
#[allow(unused_unsafe)]
fn as_jsvalue(&self, store: &impl AsStoreRef) -> wasm_bindgen::JsValue {
let imports_object = js_sys::Object::new();
for (namespace, name, extern_) in self.iter() {
let val = unsafe { js_sys::Reflect::get(&imports_object, &namespace.into()).unwrap() };
if !val.is_undefined() {
// If the namespace is already set
// Annotation is here to prevent spurious IDE warnings.
#[allow(unused_unsafe)]
unsafe {
js_sys::Reflect::set(
&val,
&name.into(),
&extern_.as_jsvalue(&store.as_store_ref()),
)
.unwrap();
}
} else {
// If the namespace doesn't exist
let import_namespace = js_sys::Object::new();
#[allow(unused_unsafe)]
unsafe {
js_sys::Reflect::set(
&import_namespace,
&name.into(),
&extern_.as_jsvalue(&store.as_store_ref()),
)
.unwrap();
js_sys::Reflect::set(
&imports_object,
&namespace.into(),
&import_namespace.into(),
)
.unwrap();
}
}
}
imports_object.into()
}
fn from_jsvalue(
store: &mut impl AsStoreMut,
module: &Self::DefinitionType,
value: &JsValue,
) -> Result<Self, JsError> {
let module_imports: HashMap<(String, String), ExternType> = module
.imports()
.map(|import| {
(
(import.module().to_string(), import.name().to_string()),
import.ty().clone(),
)
})
.collect::<HashMap<(String, String), ExternType>>();
let mut map: HashMap<(String, String), Extern> = HashMap::new();
let object: js_sys::Object = value.clone().into();
for module_entry in js_sys::Object::entries(&object).iter() {
let module_entry: js_sys::Array = module_entry.into();
let module_name = module_entry.get(0).as_string().unwrap().to_string();
let module_import_object: js_sys::Object = module_entry.get(1).into();
for import_entry in js_sys::Object::entries(&module_import_object).iter() {
let import_entry: js_sys::Array = import_entry.into();
let import_name = import_entry.get(0).as_string().unwrap().to_string();
let import_js: wasm_bindgen::JsValue = import_entry.get(1);
let key = (module_name.clone(), import_name);
let extern_type = module_imports.get(&key).unwrap();
let extern_ = Extern::from_jsvalue(store, extern_type, &import_js)?;
map.insert(key, extern_);
}
}
Ok(Self { map })
}
}
impl AsJs for Extern {
type DefinitionType = ExternType;
fn as_jsvalue(&self, _store: &impl AsStoreRef) -> wasm_bindgen::JsValue {
match self {
Self::Memory(memory) => memory.0.handle.memory.clone().into(),
Self::Function(function) => function.0.handle.function.clone().into(),
Self::Table(table) => table.0.handle.table.clone().into(),
Self::Global(global) => global.0.handle.global.clone().into(),
}
}
fn from_jsvalue(
store: &mut impl AsStoreMut,
extern_type: &Self::DefinitionType,
val: &JsValue,
) -> Result<Self, JsError> {
// Note: this function do a soft check over the type
// We only check the "kind" of Extern, but nothing else
match extern_type {
ExternType::Memory(memory_type) => {
Ok(Self::Memory(Memory::from_jsvalue(store, memory_type, val)?))
}
ExternType::Global(global_type) => {
Ok(Self::Global(Global::from_jsvalue(store, global_type, val)?))
}
ExternType::Function(function_type) => Ok(Self::Function(Function::from_jsvalue(
store,
function_type,
val,
)?)),
ExternType::Table(table_type) => {
Ok(Self::Table(Table::from_jsvalue(store, table_type, val)?))
}
}
}
}
impl AsJs for Instance {
type DefinitionType = crate::module::Module;
fn as_jsvalue(&self, _store: &impl AsStoreRef) -> wasm_bindgen::JsValue {
self._inner._handle.clone().into()
}
fn from_jsvalue(
store: &mut impl AsStoreMut,
module: &Self::DefinitionType,
value: &JsValue,
) -> Result<Self, JsError> {
let js_instance: js_sys::WebAssembly::Instance = value.clone().into();
let (instance, exports) = JsInstance::from_module_and_instance(store, module, js_instance)
.map_err(|e| JsError::new(&format!("Can't get the instance: {:?}", e)))?;
Ok(Instance {
_inner: instance,
module: module.clone(),
exports,
})
}
}
impl AsJs for Memory {
type DefinitionType = crate::MemoryType;
fn as_jsvalue(&self, _store: &impl AsStoreRef) -> wasm_bindgen::JsValue {
self.0.handle.memory.clone().into()
}
fn from_jsvalue(
store: &mut impl AsStoreMut,
memory_type: &Self::DefinitionType,
value: &JsValue,
) -> Result<Self, JsError> {
if let Some(memory) = value.dyn_ref::<JsMemory>() {
Ok(Memory::from_vm_extern(
store,
VMMemory::new(memory.clone(), memory_type.clone()),
))
} else {
Err(JsError::new(&format!(
"Extern expect to be of type Memory, but received {:?}",
value
)))
}
}
}
impl AsJs for Function {
type DefinitionType = crate::FunctionType;
fn as_jsvalue(&self, _store: &impl AsStoreRef) -> wasm_bindgen::JsValue {
self.0.handle.function.clone().into()
}
fn from_jsvalue(
store: &mut impl AsStoreMut,
function_type: &Self::DefinitionType,
value: &JsValue,
) -> Result<Self, JsError> {
if value.is_instance_of::<JsFunction>() {
Ok(Function::from_vm_extern(
store,
VMFunction::new(
value.clone().unchecked_into::<JsFunction>(),
function_type.clone(),
),
))
} else {
Err(JsError::new(&format!(
"Extern expect to be of type Function, but received {:?}",
value
)))
}
}
}
impl AsJs for Global {
type DefinitionType = crate::GlobalType;
fn as_jsvalue(&self, _store: &impl AsStoreRef) -> wasm_bindgen::JsValue {
self.0.handle.global.clone().into()
}
fn from_jsvalue(
store: &mut impl AsStoreMut,
global_type: &Self::DefinitionType,
value: &JsValue,
) -> Result<Self, JsError> {
if value.is_instance_of::<JsGlobal>() {
Ok(Global::from_vm_extern(
store,
VMGlobal::new(
value.clone().unchecked_into::<JsGlobal>(),
global_type.clone(),
),
))
} else {
Err(JsError::new(&format!(
"Extern expect to be of type Global, but received {:?}",
value
)))
}
}
}
impl AsJs for Table {
type DefinitionType = crate::TableType;
fn as_jsvalue(&self, _store: &impl AsStoreRef) -> wasm_bindgen::JsValue {
self.0.handle.table.clone().into()
}
fn from_jsvalue(
store: &mut impl AsStoreMut,
table_type: &Self::DefinitionType,
value: &JsValue,
) -> Result<Self, JsError> {
if value.is_instance_of::<JsTable>() {
Ok(Table::from_vm_extern(
store,
VMTable::new(
value.clone().unchecked_into::<JsTable>(),
table_type.clone(),
),
))
} else {
Err(JsError::new(&format!(
"Extern expect to be of type Table, but received {:?}",
value
)))
}
}
}