/// Auto-generated bindings for a pre-instantiated version of a /// component which implements the world `imports`. /// /// This structure is created through [`ImportsPre::new`] which /// takes a [`InstancePre`](wasmtime::component::InstancePre) that /// has been created through a [`Linker`](wasmtime::component::Linker). /// /// For more information see [`Imports`] as well. pub struct ImportsPre { instance_pre: wasmtime::component::InstancePre, indices: ImportsIndices, } impl Clone for ImportsPre { fn clone(&self) -> Self { Self { instance_pre: self.instance_pre.clone(), indices: self.indices.clone(), } } } impl<_T: 'static> ImportsPre<_T> { /// Creates a new copy of `ImportsPre` bindings which can then /// be used to instantiate into a particular store. /// /// This method may fail if the component behind `instance_pre` /// does not have the required exports. pub fn new( instance_pre: wasmtime::component::InstancePre<_T>, ) -> wasmtime::Result { let indices = ImportsIndices::new(&instance_pre)?; Ok(Self { instance_pre, indices }) } pub fn engine(&self) -> &wasmtime::Engine { self.instance_pre.engine() } pub fn instance_pre(&self) -> &wasmtime::component::InstancePre<_T> { &self.instance_pre } /// Instantiates a new instance of [`Imports`] within the /// `store` provided. /// /// This function will use `self` as the pre-instantiated /// instance to perform instantiation. Afterwards the preloaded /// indices in `self` are used to lookup all exports on the /// resulting instance. pub fn instantiate( &self, mut store: impl wasmtime::AsContextMut, ) -> wasmtime::Result { let mut store = store.as_context_mut(); let instance = self.instance_pre.instantiate(&mut store)?; self.indices.load(&mut store, &instance) } } impl<_T: Send + 'static> ImportsPre<_T> { /// Same as [`Self::instantiate`], except with `async`. pub async fn instantiate_async( &self, mut store: impl wasmtime::AsContextMut, ) -> wasmtime::Result { let mut store = store.as_context_mut(); let instance = self.instance_pre.instantiate_async(&mut store).await?; self.indices.load(&mut store, &instance) } } /// Auto-generated bindings for index of the exports of /// `imports`. /// /// This is an implementation detail of [`ImportsPre`] and can /// be constructed if needed as well. /// /// For more information see [`Imports`] as well. #[derive(Clone)] pub struct ImportsIndices {} /// Auto-generated bindings for an instance a component which /// implements the world `imports`. /// /// This structure can be created through a number of means /// depending on your requirements and what you have on hand: /// /// * The most convenient way is to use /// [`Imports::instantiate`] which only needs a /// [`Store`], [`Component`], and [`Linker`]. /// /// * Alternatively you can create a [`ImportsPre`] ahead of /// time with a [`Component`] to front-load string lookups /// of exports once instead of per-instantiation. This /// method then uses [`ImportsPre::instantiate`] to /// create a [`Imports`]. /// /// * If you've instantiated the instance yourself already /// then you can use [`Imports::new`]. /// /// These methods are all equivalent to one another and move /// around the tradeoff of what work is performed when. /// /// [`Store`]: wasmtime::Store /// [`Component`]: wasmtime::component::Component /// [`Linker`]: wasmtime::component::Linker pub struct Imports {} const _: () = { impl ImportsIndices { /// Creates a new copy of `ImportsIndices` bindings which can then /// be used to instantiate into a particular store. /// /// This method may fail if the component does not have the /// required exports. pub fn new<_T>( _instance_pre: &wasmtime::component::InstancePre<_T>, ) -> wasmtime::Result { let _component = _instance_pre.component(); let _instance_type = _instance_pre.instance_type(); Ok(ImportsIndices {}) } /// Uses the indices stored in `self` to load an instance /// of [`Imports`] from the instance provided. /// /// Note that at this time this method will additionally /// perform type-checks of all exports. pub fn load( &self, mut store: impl wasmtime::AsContextMut, instance: &wasmtime::component::Instance, ) -> wasmtime::Result { let _ = &mut store; let _instance = instance; Ok(Imports {}) } } impl Imports { /// Convenience wrapper around [`ImportsPre::new`] and /// [`ImportsPre::instantiate`]. pub fn instantiate<_T>( store: impl wasmtime::AsContextMut, component: &wasmtime::component::Component, linker: &wasmtime::component::Linker<_T>, ) -> wasmtime::Result { let pre = linker.instantiate_pre(component)?; ImportsPre::new(pre)?.instantiate(store) } /// Convenience wrapper around [`ImportsIndices::new`] and /// [`ImportsIndices::load`]. pub fn new( mut store: impl wasmtime::AsContextMut, instance: &wasmtime::component::Instance, ) -> wasmtime::Result { let indices = ImportsIndices::new(&instance.instance_pre(&store))?; indices.load(&mut store, instance) } /// Convenience wrapper around [`ImportsPre::new`] and /// [`ImportsPre::instantiate_async`]. pub async fn instantiate_async<_T>( store: impl wasmtime::AsContextMut, component: &wasmtime::component::Component, linker: &wasmtime::component::Linker<_T>, ) -> wasmtime::Result where _T: Send, { let pre = linker.instantiate_pre(component)?; ImportsPre::new(pre)?.instantiate_async(store).await } pub fn add_to_linker( linker: &mut wasmtime::component::Linker, host_getter: fn(&mut T) -> D::Data<'_>, ) -> wasmtime::Result<()> where D: a::b::interface_with_live_type::HostWithStore + a::b::interface_with_dead_type::HostWithStore, for<'a> D::Data< 'a, >: a::b::interface_with_live_type::Host + a::b::interface_with_dead_type::Host, T: 'static, { a::b::interface_with_live_type::add_to_linker::(linker, host_getter)?; a::b::interface_with_dead_type::add_to_linker::(linker, host_getter)?; Ok(()) } } }; pub mod a { pub mod b { #[allow(clippy::all)] pub mod interface_with_live_type { #[allow(unused_imports)] use wasmtime::component::__internal::Box; #[derive(wasmtime::component::ComponentType)] #[derive(wasmtime::component::Lift)] #[derive(wasmtime::component::Lower)] #[component(record)] #[derive(Clone, Copy)] pub struct LiveType { #[component(name = "a")] pub a: u32, } impl core::fmt::Debug for LiveType { fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result { f.debug_struct("LiveType").field("a", &self.a).finish() } } const _: () = { assert!(4 == < LiveType as wasmtime::component::ComponentType >::SIZE32); assert!( 4 == < LiveType as wasmtime::component::ComponentType >::ALIGN32 ); }; pub trait HostWithStore: wasmtime::component::HasData {} impl<_T: ?Sized> HostWithStore for _T where _T: wasmtime::component::HasData, {} pub trait Host { fn f(&mut self) -> LiveType; } impl<_T: Host + ?Sized> Host for &mut _T { fn f(&mut self) -> LiveType { Host::f(*self) } } pub fn add_to_linker( linker: &mut wasmtime::component::Linker, host_getter: fn(&mut T) -> D::Data<'_>, ) -> wasmtime::Result<()> where D: HostWithStore, for<'a> D::Data<'a>: Host, T: 'static, { let mut inst = linker.instance("a:b/interface-with-live-type")?; inst.func_wrap( "f", move |mut caller: wasmtime::StoreContextMut<'_, T>, (): ()| { let host = &mut host_getter(caller.data_mut()); let r = Host::f(host); Ok((r,)) }, )?; Ok(()) } } #[allow(clippy::all)] pub mod interface_with_dead_type { #[allow(unused_imports)] use wasmtime::component::__internal::Box; pub type LiveType = super::super::super::a::b::interface_with_live_type::LiveType; const _: () = { assert!(4 == < LiveType as wasmtime::component::ComponentType >::SIZE32); assert!( 4 == < LiveType as wasmtime::component::ComponentType >::ALIGN32 ); }; #[derive(wasmtime::component::ComponentType)] #[derive(wasmtime::component::Lift)] #[derive(wasmtime::component::Lower)] #[component(record)] #[derive(Clone, Copy)] pub struct DeadType { #[component(name = "a")] pub a: u32, } impl core::fmt::Debug for DeadType { fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result { f.debug_struct("DeadType").field("a", &self.a).finish() } } const _: () = { assert!(4 == < DeadType as wasmtime::component::ComponentType >::SIZE32); assert!( 4 == < DeadType as wasmtime::component::ComponentType >::ALIGN32 ); }; #[derive(wasmtime::component::ComponentType)] #[derive(wasmtime::component::Lift)] #[derive(wasmtime::component::Lower)] #[component(variant)] #[derive(Clone, Copy)] pub enum V { #[component(name = "a")] A(LiveType), #[component(name = "b")] B(DeadType), } impl core::fmt::Debug for V { fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result { match self { V::A(e) => f.debug_tuple("V::A").field(e).finish(), V::B(e) => f.debug_tuple("V::B").field(e).finish(), } } } const _: () = { assert!(8 == < V as wasmtime::component::ComponentType >::SIZE32); assert!(4 == < V as wasmtime::component::ComponentType >::ALIGN32); }; pub trait HostWithStore: wasmtime::component::HasData {} impl<_T: ?Sized> HostWithStore for _T where _T: wasmtime::component::HasData, {} pub trait Host {} impl<_T: Host + ?Sized> Host for &mut _T {} pub fn add_to_linker( linker: &mut wasmtime::component::Linker, host_getter: fn(&mut T) -> D::Data<'_>, ) -> wasmtime::Result<()> where D: HostWithStore, for<'a> D::Data<'a>: Host, T: 'static, { let mut inst = linker.instance("a:b/interface-with-dead-type")?; Ok(()) } } } }