76b82910c9
* Remove the module linking implementation in Wasmtime This commit removes the experimental implementation of the module linking WebAssembly proposal from Wasmtime. The module linking is no longer intended for core WebAssembly but is instead incorporated into the component model now at this point. This means that very large parts of Wasmtime's implementation of module linking are no longer applicable and would change greatly with an implementation of the component model. The main purpose of this is to remove Wasmtime's reliance on the support for module-linking in `wasmparser` and tooling crates. With this reliance removed we can move over to the `component-model` branch of `wasmparser` and use the updated support for the component model. Additionally given the trajectory of the component model proposal the embedding API of Wasmtime will not look like what it looks like today for WebAssembly. For example the core wasm `Instance` will not change and instead a `Component` is likely to be added instead. Some more rationale for this is in #3941, but the basic idea is that I feel that it's not going to be viable to develop support for the component model on a non-`main` branch of Wasmtime. Additionaly I don't think it's viable, for the same reasons as `wasm-tools`, to support the old module linking proposal and the new component model at the same time. This commit takes a moment to not only delete the existing module linking implementation but some abstractions are also simplified. For example module serialization is a bit simpler that there's only one module. Additionally instantiation is much simpler since the only initializer we have to deal with are imports and nothing else. Closes #3941 * Fix doc link * Update comments
722 lines
22 KiB
Rust
722 lines
22 KiB
Rust
use anyhow::Result;
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use std::future::Future;
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use std::pin::Pin;
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use std::task::{Context, Poll, RawWaker, RawWakerVTable, Waker};
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use wasmtime::*;
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fn async_store() -> Store<()> {
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Store::new(&Engine::new(Config::new().async_support(true)).unwrap(), ())
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}
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fn run_smoke_test(store: &mut Store<()>, func: Func) {
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run(func.call_async(&mut *store, &[], &mut [])).unwrap();
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run(func.call_async(&mut *store, &[], &mut [])).unwrap();
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}
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fn run_smoke_typed_test(store: &mut Store<()>, func: Func) {
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let func = func.typed::<(), (), _>(&store).unwrap();
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run(func.call_async(&mut *store, ())).unwrap();
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run(func.call_async(&mut *store, ())).unwrap();
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}
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#[test]
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fn smoke() {
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let mut store = async_store();
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let func = Func::new_async(
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&mut store,
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FuncType::new(None, None),
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move |_caller, _params, _results| Box::new(async { Ok(()) }),
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);
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run_smoke_test(&mut store, func);
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run_smoke_typed_test(&mut store, func);
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let func = Func::wrap0_async(&mut store, move |_caller| Box::new(async { Ok(()) }));
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run_smoke_test(&mut store, func);
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run_smoke_typed_test(&mut store, func);
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}
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#[test]
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fn smoke_host_func() -> Result<()> {
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let mut store = async_store();
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let mut linker = Linker::new(store.engine());
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linker.func_new_async(
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"",
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"first",
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FuncType::new(None, None),
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move |_caller, _params, _results| Box::new(async { Ok(()) }),
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)?;
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linker.func_wrap0_async("", "second", move |_caller| Box::new(async { Ok(()) }))?;
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let func = linker
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.get(&mut store, "", "first")
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.unwrap()
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.into_func()
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.unwrap();
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run_smoke_test(&mut store, func);
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run_smoke_typed_test(&mut store, func);
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let func = linker
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.get(&mut store, "", "second")
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.unwrap()
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.into_func()
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.unwrap();
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run_smoke_test(&mut store, func);
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run_smoke_typed_test(&mut store, func);
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Ok(())
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}
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#[test]
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fn smoke_with_suspension() {
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let mut store = async_store();
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let func = Func::new_async(
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&mut store,
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FuncType::new(None, None),
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move |_caller, _params, _results| {
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Box::new(async {
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PendingOnce::default().await;
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Ok(())
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})
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},
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);
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run_smoke_test(&mut store, func);
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run_smoke_typed_test(&mut store, func);
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let func = Func::wrap0_async(&mut store, move |_caller| {
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Box::new(async {
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PendingOnce::default().await;
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Ok(())
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})
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});
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run_smoke_test(&mut store, func);
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run_smoke_typed_test(&mut store, func);
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}
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#[test]
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fn smoke_host_func_with_suspension() -> Result<()> {
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let mut store = async_store();
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let mut linker = Linker::new(store.engine());
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linker.func_new_async(
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"",
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"first",
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FuncType::new(None, None),
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move |_caller, _params, _results| {
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Box::new(async {
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PendingOnce::default().await;
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Ok(())
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})
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},
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)?;
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linker.func_wrap0_async("", "second", move |_caller| {
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Box::new(async {
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PendingOnce::default().await;
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Ok(())
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})
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})?;
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let func = linker
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.get(&mut store, "", "first")
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.unwrap()
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.into_func()
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.unwrap();
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run_smoke_test(&mut store, func);
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run_smoke_typed_test(&mut store, func);
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let func = linker
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.get(&mut store, "", "second")
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.unwrap()
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.into_func()
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.unwrap();
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run_smoke_test(&mut store, func);
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run_smoke_typed_test(&mut store, func);
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Ok(())
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}
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#[test]
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fn recursive_call() {
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let mut store = async_store();
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let async_wasm_func = Func::new_async(
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&mut store,
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FuncType::new(None, None),
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|_caller, _params, _results| {
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Box::new(async {
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PendingOnce::default().await;
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Ok(())
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})
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},
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);
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// Create an imported function which recursively invokes another wasm
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// function asynchronously, although this one is just our own host function
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// which suffices for this test.
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let func2 = Func::new_async(
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&mut store,
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FuncType::new(None, None),
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move |mut caller, _params, _results| {
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Box::new(async move {
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async_wasm_func
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.call_async(&mut caller, &[], &mut [])
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.await?;
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Ok(())
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})
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},
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);
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// Create an instance which calls an async import twice.
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let module = Module::new(
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store.engine(),
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"
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(module
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(import \"\" \"\" (func))
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(func (export \"\")
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;; call imported function which recursively does an async
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;; call
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call 0
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;; do it again, and our various pointers all better align
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call 0))
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",
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)
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.unwrap();
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run(async {
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let instance = Instance::new_async(&mut store, &module, &[func2.into()]).await?;
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let func = instance.get_func(&mut store, "").unwrap();
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func.call_async(&mut store, &[], &mut []).await
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})
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.unwrap();
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}
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#[test]
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fn suspend_while_suspending() {
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let mut store = async_store();
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// Create a synchronous function which calls our asynchronous function and
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// runs it locally. This shouldn't generally happen but we know everything
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// is synchronous in this test so it's fine for us to do this.
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//
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// The purpose of this test is intended to stress various cases in how
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// we manage pointers in ways that are not necessarily common but are still
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// possible in safe code.
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let async_thunk = Func::new_async(
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&mut store,
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FuncType::new(None, None),
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|_caller, _params, _results| Box::new(async { Ok(()) }),
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);
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let sync_call_async_thunk = Func::new(
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&mut store,
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FuncType::new(None, None),
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move |mut caller, _params, _results| {
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run(async_thunk.call_async(&mut caller, &[], &mut []))?;
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Ok(())
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},
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);
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// A small async function that simply awaits once to pump the loops and
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// then finishes.
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let async_import = Func::new_async(
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&mut store,
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FuncType::new(None, None),
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move |_caller, _params, _results| {
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Box::new(async move {
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PendingOnce::default().await;
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Ok(())
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})
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},
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);
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let module = Module::new(
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store.engine(),
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"
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(module
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(import \"\" \"\" (func $sync_call_async_thunk))
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(import \"\" \"\" (func $async_import))
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(func (export \"\")
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;; Set some store-local state and pointers
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call $sync_call_async_thunk
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;; .. and hopefully it's all still configured correctly
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call $async_import))
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",
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)
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.unwrap();
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run(async {
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let instance = Instance::new_async(
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&mut store,
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&module,
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&[sync_call_async_thunk.into(), async_import.into()],
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)
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.await?;
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let func = instance.get_func(&mut store, "").unwrap();
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func.call_async(&mut store, &[], &mut []).await
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})
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.unwrap();
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}
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#[test]
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fn cancel_during_run() {
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let mut store = Store::new(&Engine::new(Config::new().async_support(true)).unwrap(), 0);
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let async_thunk = Func::new_async(
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&mut store,
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FuncType::new(None, None),
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move |mut caller, _params, _results| {
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assert_eq!(*caller.data(), 0);
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*caller.data_mut() = 1;
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let dtor = SetOnDrop(caller);
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Box::new(async move {
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drop(&dtor);
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PendingOnce::default().await;
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Ok(())
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})
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},
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);
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// Shouldn't have called anything yet...
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assert_eq!(*store.data(), 0);
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// Create our future, but as per async conventions this still doesn't
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// actually do anything. No wasm or host function has been called yet.
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let mut future = Pin::from(Box::new(async_thunk.call_async(&mut store, &[], &mut [])));
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// Push the future forward one tick, which actually runs the host code in
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// our async func. Our future is designed to be pending once, however.
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let poll = future
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.as_mut()
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.poll(&mut Context::from_waker(&dummy_waker()));
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assert!(poll.is_pending());
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// Now that our future is running (on a separate, now-suspended fiber), drop
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// the future and that should deallocate all the Rust bits as well.
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drop(future);
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assert_eq!(*store.data(), 2);
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struct SetOnDrop<'a>(Caller<'a, usize>);
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impl Drop for SetOnDrop<'_> {
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fn drop(&mut self) {
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assert_eq!(*self.0.data(), 1);
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*self.0.data_mut() = 2;
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}
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}
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}
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#[derive(Default)]
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struct PendingOnce {
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already_polled: bool,
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}
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impl Future for PendingOnce {
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type Output = ();
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fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<()> {
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if self.already_polled {
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Poll::Ready(())
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} else {
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self.already_polled = true;
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cx.waker().wake_by_ref();
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Poll::Pending
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}
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}
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}
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fn run<F: Future>(future: F) -> F::Output {
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let mut f = Pin::from(Box::new(future));
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let waker = dummy_waker();
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let mut cx = Context::from_waker(&waker);
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loop {
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match f.as_mut().poll(&mut cx) {
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Poll::Ready(val) => break val,
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Poll::Pending => {}
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}
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}
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}
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fn dummy_waker() -> Waker {
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return unsafe { Waker::from_raw(clone(5 as *const _)) };
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unsafe fn clone(ptr: *const ()) -> RawWaker {
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assert_eq!(ptr as usize, 5);
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const VTABLE: RawWakerVTable = RawWakerVTable::new(clone, wake, wake_by_ref, drop);
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RawWaker::new(ptr, &VTABLE)
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}
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unsafe fn wake(ptr: *const ()) {
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assert_eq!(ptr as usize, 5);
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}
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unsafe fn wake_by_ref(ptr: *const ()) {
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assert_eq!(ptr as usize, 5);
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}
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unsafe fn drop(ptr: *const ()) {
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assert_eq!(ptr as usize, 5);
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}
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}
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#[test]
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fn iloop_with_fuel() {
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let engine = Engine::new(Config::new().async_support(true).consume_fuel(true)).unwrap();
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let mut store = Store::new(&engine, ());
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store.out_of_fuel_async_yield(1_000, 10);
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let module = Module::new(
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&engine,
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"
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(module
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(func (loop br 0))
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(start 0)
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)
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",
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)
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.unwrap();
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let instance = Instance::new_async(&mut store, &module, &[]);
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let mut f = Pin::from(Box::new(instance));
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let waker = dummy_waker();
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let mut cx = Context::from_waker(&waker);
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// This should yield a bunch of times...
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for _ in 0..100 {
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assert!(f.as_mut().poll(&mut cx).is_pending());
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}
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// ... but it should eventually also finish.
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loop {
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match f.as_mut().poll(&mut cx) {
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Poll::Ready(_) => break,
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Poll::Pending => {}
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}
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}
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}
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#[test]
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fn fuel_eventually_finishes() {
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let engine = Engine::new(Config::new().async_support(true).consume_fuel(true)).unwrap();
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let mut store = Store::new(&engine, ());
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store.out_of_fuel_async_yield(u64::max_value(), 10);
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let module = Module::new(
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&engine,
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"
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(module
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(func
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(local i32)
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i32.const 100
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local.set 0
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(loop
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local.get 0
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i32.const -1
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i32.add
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local.tee 0
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br_if 0)
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)
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(start 0)
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)
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",
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)
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.unwrap();
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let instance = Instance::new_async(&mut store, &module, &[]);
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run(instance).unwrap();
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}
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#[test]
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fn async_with_pooling_stacks() {
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let mut config = Config::new();
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config.async_support(true);
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config.allocation_strategy(InstanceAllocationStrategy::Pooling {
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strategy: PoolingAllocationStrategy::NextAvailable,
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instance_limits: InstanceLimits {
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count: 1,
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memory_pages: 1,
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table_elements: 0,
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..Default::default()
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},
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});
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config.dynamic_memory_guard_size(0);
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config.static_memory_guard_size(0);
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config.static_memory_maximum_size(65536);
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let engine = Engine::new(&config).unwrap();
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let mut store = Store::new(&engine, ());
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let func = Func::new_async(
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&mut store,
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FuncType::new(None, None),
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move |_caller, _params, _results| Box::new(async { Ok(()) }),
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);
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run_smoke_test(&mut store, func);
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run_smoke_typed_test(&mut store, func);
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}
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|
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#[test]
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fn async_host_func_with_pooling_stacks() -> Result<()> {
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let mut config = Config::new();
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config.async_support(true);
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config.allocation_strategy(InstanceAllocationStrategy::Pooling {
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strategy: PoolingAllocationStrategy::NextAvailable,
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instance_limits: InstanceLimits {
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count: 1,
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memory_pages: 1,
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table_elements: 0,
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..Default::default()
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},
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});
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config.dynamic_memory_guard_size(0);
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config.static_memory_guard_size(0);
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config.static_memory_maximum_size(65536);
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let mut store = Store::new(&Engine::new(&config)?, ());
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let mut linker = Linker::new(store.engine());
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linker.func_new_async(
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"",
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"",
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FuncType::new(None, None),
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move |_caller, _params, _results| Box::new(async { Ok(()) }),
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)?;
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|
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let func = linker.get(&mut store, "", "").unwrap().into_func().unwrap();
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run_smoke_test(&mut store, func);
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run_smoke_typed_test(&mut store, func);
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Ok(())
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}
|
|
|
|
fn execute_across_threads<F: Future + Send + 'static>(future: F) {
|
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let mut future = Pin::from(Box::new(future));
|
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let poll = future
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.as_mut()
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.poll(&mut Context::from_waker(&dummy_waker()));
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assert!(poll.is_pending());
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|
|
std::thread::spawn(move || {
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let poll = future
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|
.as_mut()
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.poll(&mut Context::from_waker(&dummy_waker()));
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assert!(!poll.is_pending());
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})
|
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.join()
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.unwrap();
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}
|
|
|
|
#[test]
|
|
fn resume_separate_thread() {
|
|
// This test will poll the following future on two threads. Simulating a
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|
// trap requires accessing TLS info, so that should be preserved correctly.
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|
execute_across_threads(async {
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|
let mut store = async_store();
|
|
let module = Module::new(
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store.engine(),
|
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"
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|
(module
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|
(import \"\" \"\" (func))
|
|
(start 0)
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)
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|
",
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)
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|
.unwrap();
|
|
let func = Func::wrap0_async(&mut store, |_| {
|
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Box::new(async {
|
|
PendingOnce::default().await;
|
|
Err::<(), _>(wasmtime::Trap::new("test"))
|
|
})
|
|
});
|
|
let result = Instance::new_async(&mut store, &module, &[func.into()]).await;
|
|
assert!(result.is_err());
|
|
});
|
|
}
|
|
|
|
#[test]
|
|
fn resume_separate_thread2() {
|
|
// This test will poll the following future on two threads. Catching a
|
|
// signal requires looking up TLS information to determine whether it's a
|
|
// trap to handle or not, so that must be preserved correctly across threads.
|
|
execute_across_threads(async {
|
|
let mut store = async_store();
|
|
let module = Module::new(
|
|
store.engine(),
|
|
"
|
|
(module
|
|
(import \"\" \"\" (func))
|
|
(func $start
|
|
call 0
|
|
unreachable)
|
|
(start $start)
|
|
)
|
|
",
|
|
)
|
|
.unwrap();
|
|
let func = Func::wrap0_async(&mut store, |_| {
|
|
Box::new(async { PendingOnce::default().await })
|
|
});
|
|
let result = Instance::new_async(&mut store, &module, &[func.into()]).await;
|
|
assert!(result.is_err());
|
|
});
|
|
}
|
|
|
|
#[test]
|
|
fn resume_separate_thread3() {
|
|
// This test doesn't actually do anything with cross-thread polls, but
|
|
// instead it deals with scheduling futures at "odd" times.
|
|
//
|
|
// First we'll set up a *synchronous* call which will initialize TLS info.
|
|
// This call is simply to a host-defined function, but it still has the same
|
|
// "enter into wasm" semantics since it's just calling a trampoline. In this
|
|
// situation we'll set up the TLS info so it's in place while the body of
|
|
// the function executes...
|
|
let mut store = Store::new(&Engine::default(), None);
|
|
let f = Func::wrap(&mut store, move |mut caller: Caller<'_, _>| {
|
|
// ... and the execution of this host-defined function (while the TLS
|
|
// info is initialized), will set up a recursive call into wasm. This
|
|
// recursive call will be done asynchronously so we can suspend it
|
|
// halfway through.
|
|
let f = async {
|
|
let mut store = async_store();
|
|
let module = Module::new(
|
|
store.engine(),
|
|
"
|
|
(module
|
|
(import \"\" \"\" (func))
|
|
(start 0)
|
|
)
|
|
",
|
|
)
|
|
.unwrap();
|
|
let func = Func::wrap0_async(&mut store, |_| {
|
|
Box::new(async { PendingOnce::default().await })
|
|
});
|
|
drop(Instance::new_async(&mut store, &module, &[func.into()]).await);
|
|
unreachable!()
|
|
};
|
|
let mut future = Pin::from(Box::new(f));
|
|
let poll = future
|
|
.as_mut()
|
|
.poll(&mut Context::from_waker(&dummy_waker()));
|
|
assert!(poll.is_pending());
|
|
|
|
// ... so at this point our call into wasm is suspended. The call into
|
|
// wasm will have overwritten TLS info, and we sure hope that the
|
|
// information is restored at this point. Note that we squirrel away the
|
|
// future somewhere else to get dropped later. If we were to drop it
|
|
// here then we would reenter the future's suspended stack to clean it
|
|
// up, which would do more alterations of TLS information we're not
|
|
// testing here.
|
|
*caller.data_mut() = Some(future);
|
|
|
|
// ... all in all this function will need access to the original TLS
|
|
// information to raise the trap. This TLS information should be
|
|
// restored even though the asynchronous execution is suspended.
|
|
Err::<(), _>(wasmtime::Trap::new(""))
|
|
});
|
|
assert!(f.call(&mut store, &[], &mut []).is_err());
|
|
}
|
|
|
|
#[test]
|
|
fn recursive_async() -> Result<()> {
|
|
let mut store = async_store();
|
|
let m = Module::new(
|
|
store.engine(),
|
|
"(module
|
|
(func (export \"overflow\") call 0)
|
|
(func (export \"normal\"))
|
|
)",
|
|
)?;
|
|
let i = run(Instance::new_async(&mut store, &m, &[]))?;
|
|
let overflow = i.get_typed_func::<(), (), _>(&mut store, "overflow")?;
|
|
let normal = i.get_typed_func::<(), (), _>(&mut store, "normal")?;
|
|
let f2 = Func::wrap0_async(&mut store, move |mut caller| {
|
|
Box::new(async move {
|
|
// recursive async calls shouldn't immediately stack overflow...
|
|
normal.call_async(&mut caller, ()).await?;
|
|
|
|
// ... but calls that actually stack overflow should indeed stack
|
|
// overflow
|
|
let err = overflow.call_async(&mut caller, ()).await.unwrap_err();
|
|
assert_eq!(err.trap_code(), Some(TrapCode::StackOverflow));
|
|
Ok(())
|
|
})
|
|
});
|
|
run(f2.call_async(&mut store, &[], &mut []))?;
|
|
Ok(())
|
|
}
|
|
|
|
#[test]
|
|
fn linker_module_command() -> Result<()> {
|
|
run(async {
|
|
let mut store = async_store();
|
|
let mut linker = Linker::new(store.engine());
|
|
let module1 = Module::new(
|
|
store.engine(),
|
|
r#"
|
|
(module
|
|
(global $g (mut i32) (i32.const 0))
|
|
|
|
(func (export "_start"))
|
|
|
|
(func (export "g") (result i32)
|
|
global.get $g
|
|
i32.const 1
|
|
global.set $g)
|
|
)
|
|
"#,
|
|
)?;
|
|
let module2 = Module::new(
|
|
store.engine(),
|
|
r#"
|
|
(module
|
|
(import "" "g" (func (result i32)))
|
|
|
|
(func (export "get") (result i32)
|
|
call 0)
|
|
)
|
|
"#,
|
|
)?;
|
|
|
|
linker.module_async(&mut store, "", &module1).await?;
|
|
let instance = linker.instantiate_async(&mut store, &module2).await?;
|
|
let f = instance.get_typed_func::<(), i32, _>(&mut store, "get")?;
|
|
assert_eq!(f.call_async(&mut store, ()).await?, 0);
|
|
assert_eq!(f.call_async(&mut store, ()).await?, 0);
|
|
|
|
Ok(())
|
|
})
|
|
}
|
|
|
|
#[test]
|
|
fn linker_module_reactor() -> Result<()> {
|
|
run(async {
|
|
let mut store = async_store();
|
|
let mut linker = Linker::new(store.engine());
|
|
let module1 = Module::new(
|
|
store.engine(),
|
|
r#"
|
|
(module
|
|
(global $g (mut i32) (i32.const 0))
|
|
|
|
(func (export "g") (result i32)
|
|
global.get $g
|
|
i32.const 1
|
|
global.set $g)
|
|
)
|
|
"#,
|
|
)?;
|
|
let module2 = Module::new(
|
|
store.engine(),
|
|
r#"
|
|
(module
|
|
(import "" "g" (func (result i32)))
|
|
|
|
(func (export "get") (result i32)
|
|
call 0)
|
|
)
|
|
"#,
|
|
)?;
|
|
|
|
linker.module_async(&mut store, "", &module1).await?;
|
|
let instance = linker.instantiate_async(&mut store, &module2).await?;
|
|
let f = instance.get_typed_func::<(), i32, _>(&mut store, "get")?;
|
|
assert_eq!(f.call_async(&mut store, ()).await?, 0);
|
|
assert_eq!(f.call_async(&mut store, ()).await?, 1);
|
|
|
|
Ok(())
|
|
})
|
|
}
|