181 lines
5.6 KiB
Rust
Executable File
181 lines
5.6 KiB
Rust
Executable File
use anyhow_ext::Result;
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use std::marker::PhantomData;
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use std::mem::transmute;
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use std::sync::Arc;
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use crate::script_implementations::wasm::export_registry::{FromWasmObj, WasmObject};
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use crate::script_implementations::wasm::script_resolver::{
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WebAssemblyEnv, WebAssemblyEnvironmentData, WebAssemblyScriptResolver,
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};
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use wasmer::FromToNativeWasmType;
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use wasmer::FunctionEnvMut;
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/// An Extern Ref allows us to pass objects to WASM without actually passing raw memory, or
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/// requiring us to make copies. Instead, we pass a simple increment index, that we can then use
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/// to find the relevant data.
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pub(crate) struct ExternRef<T: ?Sized> {
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/// The lookup index we can use to find the data.
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index: usize,
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/// Phantom data so we can get a type generic.
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_phantom: PhantomData<T>,
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}
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impl<T: ?Sized> Copy for ExternRef<T> {}
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impl<T: ?Sized> Clone for ExternRef<T> {
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fn clone(&self) -> Self {
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*self
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}
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}
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impl<T: ?Sized> Default for ExternRef<T> {
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fn default() -> Self {
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Self {
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index: 0,
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_phantom: Default::default(),
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}
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}
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}
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impl<T: ?Sized> ExternRef<T> {
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/// Instantiates a new ExternRef for a bit of data. If we already have made an Extern Ref for
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/// this data and type, we use that instead.
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pub fn new(env: &WebAssemblyEnvironmentData, value: WasmObject) -> Self {
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Self {
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index: env.get_extern_ref_index(value),
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_phantom: Default::default(),
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}
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}
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/// Instantiates a new ExternRef for a bit of data using the function environment. If we already
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/// have made an Extern Ref for this data and type, we use that instead.
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pub fn func_new(env: &FunctionEnvMut<WebAssemblyEnv>, value: WasmObject) -> Self {
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Self {
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index: env.data().data().get_extern_ref_index(value),
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_phantom: Default::default(),
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}
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}
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/// Creates an ExternRef with a given resolver. This can be used in cases where we do not have an environment variable.
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pub(crate) fn new_with_resolver(resolver: &WebAssemblyScriptResolver, value: WasmObject) -> Self {
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Self {
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index: resolver.environment_data().get_extern_ref_index(value),
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_phantom: Default::default(),
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}
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}
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/// An empty value ExternRef.
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pub fn null() -> Self {
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Self {
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index: 0,
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_phantom: Default::default(),
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}
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}
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/// Returns the real value for a given ExternRef. Note that the requested type must be the same as the type of the
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/// value when it was passed before. If these types do not match, this will panic.
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pub fn value_func(&self, env: &FunctionEnvMut<WebAssemblyEnv>) -> Result<T>
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where
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T: FromWasmObj,
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{
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self.value(&env.data().data())
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}
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/// Returns the real value for a given ExternRef. Note that the requested type must be the same as the type of the
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/// value when it was passed before. If these types do not match, this will panic.
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pub fn value_func_arc(&self, env: &FunctionEnvMut<WebAssemblyEnv>) -> Result<Arc<T>>
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where
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Arc<T>: FromWasmObj,
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{
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self.value_arc(&env.data().data())
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}
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/// Returns the real value for a given ExternRef. Note that the requested type must be the same as the type of the
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/// value when it was passed before. If these types do not match, this will panic.
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pub fn value(&self, env: &Arc<WebAssemblyEnvironmentData>) -> Result<T>
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where
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T: FromWasmObj,
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{
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let value = env.get_extern_ref_value::<T>(self.index)?;
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let o = FromWasmObj::from_wasm_obj(value)?;
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Ok(o)
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}
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/// Returns the real value for a given ExternRef. Note that the requested type must be the same as the type of the
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/// value when it was passed before. If these types do not match, this will panic.
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pub fn value_arc(&self, env: &Arc<WebAssemblyEnvironmentData>) -> Result<Arc<T>>
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where
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Arc<T>: FromWasmObj,
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{
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let wasm_obj = env.get_extern_ref_value::<T>(self.index)?;
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FromWasmObj::from_wasm_obj(wasm_obj)
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}
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/// Returns the internal index for this ExternRef.
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pub(crate) fn index(&self) -> usize {
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self.index
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}
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}
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unsafe impl<T: ?Sized> FromToNativeWasmType for ExternRef<T> {
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type Native = i32;
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fn from_native(native: Self::Native) -> Self {
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Self {
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index: native as usize,
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_phantom: Default::default(),
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}
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}
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fn to_native(self) -> Self::Native {
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self.index as i32
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}
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}
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/// A VecExternRef is an Extern Ref for vector types. This allows us to pass Vecs to WASM without
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/// actually passing raw memory, or requiring us to make copies.
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pub(crate) struct VecExternRef<T> {
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/// The lookup index we can use to find the data.
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index: usize,
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/// The number of items in the vec.
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size: u32,
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/// Phantom data so we can get a type generic.
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_phantom: PhantomData<T>,
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}
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impl<T> Clone for VecExternRef<T> {
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fn clone(&self) -> Self {
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*self
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}
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}
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impl<T> Copy for VecExternRef<T> {}
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impl<T> Default for VecExternRef<T> {
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fn default() -> Self {
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Self {
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index: 0,
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size: 0,
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_phantom: Default::default(),
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}
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}
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}
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unsafe impl<T> FromToNativeWasmType for VecExternRef<T> {
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type Native = i64;
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fn from_native(native: Self::Native) -> Self {
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let split: (u32, u32) = unsafe { transmute(native) };
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Self {
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index: split.0 as usize,
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size: split.1,
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_phantom: Default::default(),
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}
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}
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fn to_native(self) -> Self::Native {
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let v: i64 = unsafe { transmute((self.index as u32, self.size)) };
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v
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}
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}
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