Add 'stream' and 'future' types by lukewagner · Pull Request #405 · WebAssembly/component-model

lukewagner · 2024-10-14T23:56:19Z

This PR builds on #363 to add future and stream type constructors along with the associated canon built-ins ({stream,future}.new, {stream,future}.{read,write}, {stream,future}.cancel-{read,write}). It also generalizes the "async_subtasks" table to also hold futures and streams, renaming it to be the "waitables" table and renaming subtask.drop to waitable.drop. Lastly, a new canonopt called always-task-return is added so that sync-lifted exports can use task.return to return their value, which you need if you want to return a stream or future from a synchronous function.

I'd suggest reading the new text in Explainer.md/Binary to get a short overview of the concrete syntactic/binary additions, then Async.md to get the high-level summary, then CanonicalABI.md to get the full details.

dicej · 2024-10-30T20:24:07Z

An earlier version of the design had separate drop built-in functions for the readable and writable ends of streams and futures, e.g. {stream|future}.drop-{reader|writer}, and the ABI included a t:<typeidx> for each of those, allowing tools and host implementations to know statically what specific type to expect, just like we've done for {stream|future}.{read|write|new}.

For symmetry with the rest of the built-ins, could we split waitable.drop back into subtask.drop and {stream|future}.drop-{reader|writer}? That would also make it clearer that {stream|future|.drop-writer can take an optional error parameter, but {stream|future}.drop-reader cannot.

lukewagner · 2024-10-30T22:46:50Z

@dicej Great point, and agreed. Split back up in this commit.

lukewagner · 2024-10-31T22:06:23Z

For visibility: this commit adds error and its associated canon built-ins, closing the TODOs in the original PR.

lukewagner · 2024-11-01T20:37:29Z

Thanks for all the excellent feedback everyone! I think the comments are dying down and it sounds like this is on a convergence path with @dicej's impl, so if nothing new pops up, I think I'll merge mid next week (and then we can continue to iterate on async in new issues and PRs).

FWIW, I think the next change I'd like to make is a PR that removes the DONE state from subtasks, which should simplify things and allow bindings for async borrows to make sense, and, after that, go through the top bullets of Async.md#TODO.

lukewagner · 2024-11-05T21:27:25Z

One other update: for both the pragmatic short-term benefit of avoiding parsing conflicts with the error resource type (defined by wasi:io/error) and, more generally, to help make it clear that it's just meant to convey non-deterministic, debugging-oriented contextual data, this commit renames error to error-context. This also nicely distinguishes error-context from the error case of the result variant (which contains the "whole" error value, including the WIT-defined error payload value).

This adds support for encoding and parsing components which use the [Async ABI](https://github.com/WebAssembly/component-model/blob/main/design/mvp/Async.md) and associated canonical options and functions, along with the [`stream`, `future`, and `error`](WebAssembly/component-model#405) types. Note that the `error` type was recently (about 30 minutes ago) renamed to `error-context` in Luke's spec PR. I haven't updated this implementation to reflect that yet, but will do so in a follow-up commit. That should allow us to avoid conflicts with existing WIT files that use `error` as a type and/or interface name. This does not include any new tests; I'll also add those in a follow-up commit. See bytecodealliance/rfcs#38 for more context. Signed-off-by: Joel Dice <joel.dice@fermyon.com>

This adds support for generating bindings which use the [Async ABI](https://github.com/WebAssembly/component-model/blob/main/design/mvp/Async.md) along with the [`stream`, `future`, and `error-context`](WebAssembly/component-model#405) types. By default, normal synchronous bindings are generated, but the user may opt-in to async bindings for all or some of the imported and/or exported functions in the target world and interfaces -- provided the default-enabled `async` feature is enabled. In addition, we generate `StreamPayload` and/or `FuturePayload` trait implementations for any types appearing as the `T` in `stream<T>` or `future<T>` in the WIT files, respectively. That enables user code to call `new_stream` or `new_future` to create `stream`s or `future`s with those payload types, then write to them, read from them, and/or pass the readable end as a parameter to a component import or return value of a component export. Note that I've added new `core::abi::Instruction` enum variants to handle async lifting and lowering, but they're currently tailored to the Rust generator and will probably change somewhat as we add support for other languages. This does not include any new tests; I'll add those in a follow-up commit. Signed-off-by: Joel Dice <joel.dice@fermyon.com>

This adds support for loading, compiling, linking, and running components which use the [Async ABI](https://github.com/WebAssembly/component-model/blob/main/design/mvp/Async.md) along with the [`stream`, `future`, and `error-context`](WebAssembly/component-model#405) types. It also adds support for generating host bindings such that multiple host functions can be run concurrently with guest tasks -- without monopolizing the `Store`. See the [implementation RFC](bytecodealliance/rfcs#38) for details, as well as [this repo](https://github.com/dicej/component-async-demo) containing end-to-end smoke tests. This is very much a work-in progress, with a number of tasks remaining: - [ ] Avoid exposing global task IDs to guests and use per-instance IDs instead - [ ] Track `task.return` type during compilation and assert the actual and expected types match at runtime - [ ] Ensure all guest pointers are bounds-checked when lifting, lowering, or copying values - [ ] Reduce code duplication in `wasmtime_cranelift::compiler::component` - [ ] Add support for `(Typed)Func::call_concurrent` per the RFC - [ ] Add support for multiplexing stream/future reads/writes and concurrent calls to guest exports per the RFC - [ ] Refactor, clean up, and unify handling of backpressure, yields, and even polling - [ ] Guard against reentrance where required (e.g. in certain fused adapter calls) - [ ] Add integration test cases covering new functionality to tests/all/component_model (starting by porting over the tests in https://github.com/dicej/component-async-demo) - [ ] Add binding generation test cases to crates/component-macro/tests - [ ] Add WAST tests to tests/misc_testsuite/component-model - [ ] Add support and test coverage for callback-less async functions (e.g. goroutines) - [ ] Switch to back to upstream `wasm-tools` once bytecodealliance/wasm-tools#1895 has been merged and released Signed-off-by: Joel Dice <joel.dice@fermyon.com>

This adds support for loading, compiling, linking, and running components which use the [Async ABI](https://github.com/WebAssembly/component-model/blob/main/design/mvp/Async.md) along with the [`stream`, `future`, and `error-context`](WebAssembly/component-model#405) types. It also adds support for generating host bindings such that multiple host functions can be run concurrently with guest tasks -- without monopolizing the `Store`. See the [implementation RFC](bytecodealliance/rfcs#38) for details, as well as [this repo](https://github.com/dicej/component-async-demo) containing end-to-end smoke tests. This is very much a work-in progress, with a number of tasks remaining: - [ ] Avoid exposing global task IDs to guests and use per-instance IDs instead - [ ] Track `task.return` type during compilation and assert the actual and expected types match at runtime - [ ] Ensure all guest pointers are bounds-checked when lifting, lowering, or copying values - [ ] Reduce code duplication in `wasmtime_cranelift::compiler::component` - [ ] Reduce code duplication between `StoreContextMut::on_fiber` and `concurrent::on_fiber` - [ ] Minimize and/or document the use of unsafe code - [ ] Add support for `(Typed)Func::call_concurrent` per the RFC - [ ] Add support for multiplexing stream/future reads/writes and concurrent calls to guest exports per the RFC - [ ] Refactor, clean up, and unify handling of backpressure, yields, and even polling - [ ] Guard against reentrance where required (e.g. in certain fused adapter calls) - [ ] Add integration test cases covering new functionality to tests/all/component_model (starting by porting over the tests in https://github.com/dicej/component-async-demo) - [ ] Add binding generation test cases to crates/component-macro/tests - [ ] Add WAST tests to tests/misc_testsuite/component-model - [ ] Add support and test coverage for callback-less async functions (e.g. goroutines) - [ ] Switch to back to upstream `wasm-tools` once bytecodealliance/wasm-tools#1895 has been merged and released Signed-off-by: Joel Dice <joel.dice@fermyon.com>

Co-authored-by: Joel Dice <joel.dice@fermyon.com>

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This adds support for loading, compiling, linking, and running components which use the [Async ABI](https://github.com/WebAssembly/component-model/blob/main/design/mvp/Async.md) along with the [`stream`, `future`, and `error-context`](WebAssembly/component-model#405) types. It also adds support for generating host bindings such that multiple host functions can be run concurrently with guest tasks -- without monopolizing the `Store`. See the [implementation RFC](bytecodealliance/rfcs#38) for details, as well as [this repo](https://github.com/dicej/component-async-demo) containing end-to-end smoke tests. Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix clippy warnings and bench/fuzzing errors Signed-off-by: Joel Dice <joel.dice@fermyon.com> revert atomic.wit whitespace change Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix build when component-model disabled Signed-off-by: Joel Dice <joel.dice@fermyon.com> bless component-macro expected output Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix no-std build error Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix build with --no-default-features --features runtime,component-model Signed-off-by: Joel Dice <joel.dice@fermyon.com> partly fix no-std build It's still broken due to the use of `std::collections::HashMap` in crates/wasmtime/src/runtime/vm/component.rs. I'll address that as part of the work to avoid exposing global task/future/stream/error-context handles to guests. Signed-off-by: Joel Dice <joel.dice@fermyon.com> maintain per-instance tables for futures, streams, and error-contexts Signed-off-by: Joel Dice <joel.dice@fermyon.com> refactor task/stream/future handle lifting/lowering This addresses a couple of issues: - Previously, we were passing task/stream/future/error-context reps directly to instances while keeping track of which instance had access to which rep. That worked fine in that there was no way to forge access to inaccessible reps, but it leaked information about what other instances were doing. Now we maintain per-instance waitable and error-context tables which map the reps to and from the handles which the instance sees. - The `no_std` build was broken due to use of `HashMap` in `runtime::vm::component`, which is now fixed. Note that we use one single table per instance for all tasks, streams, and futures. This is partly necessary because, when async events are delivered to the guest, it wouldn't have enough context to know which stream or future we're talking about if each unique stream and future type had its own table. So at minimum, we need to use the same table for all streams (regardless of payload type), and likewise for futures. Also, per WebAssembly/component-model#395 (comment), the plan is to move towards a shared table for all resource types as well, so this moves us in that direction. Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix wave breakage due to new stream/future/error-context types Signed-off-by: Joel Dice <joel.dice@fermyon.com> switch wasm-tools to v1.220.0-based branch Signed-off-by: Joel Dice <joel.dice@fermyon.com> check `task.return` type at runtime We can't statically verify a given call to `task.return` corresponds to the expected core signature appropriate for the currently running task, so we must do so at runtime. In order to make that check efficient, we intern the types. My initial plan was to use `ModuleInternedTypeIndex` and/or `VMSharedTypeIndex` for interning, but that got hairy with WasmGC considerations, so instead I added new fields to `ComponentTypes` and `ComponentTypesBuilder`. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add `TypedFunc::call_concurrent` and refine stream/future APIs This implements what I proposed in https://github.com/dicej/rfcs/blob/component-async/accepted/component-model-async.md#wasmtime. Specifically, it adds: - A new `Promise` type, useful for working with concurrent operations that require access to a `Store` to make progress. - A new `PromisesUnordered` type for `await`ing multiple promises concurrently -`TypedFunc::call_concurrent` (which returns a `Promise`), allowing multiple host->guest calls to run concurrently on the same instance. - Updated `{Stream|Future}{Writer|Reader}` APIs which use `Promise` The upshot is that the embedder can now ergonomically manage arbitrary numbers of concurrent operations. Previously, this was a lot more difficult to do without accidentally starving some of the operations due to another one monopolizing the `Store`. Finally, this includes various refactorings and fixes for bugs exposed by the newer, more versatile APIs. Signed-off-by: Joel Dice <joel.dice@fermyon.com> clean up verbosity in component/func.rs Signed-off-by: Joel Dice <joel.dice@fermyon.com> snapshot Signed-off-by: Joel Dice <joel.dice@fermyon.com> implement stream/future read/write cancellation This required a somewhat viral addition of `Send` and `Sync` bounds for async host function closure types, unfortunately. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add `Func::call_concurrent` and `LinkerInstance::func_new_concurrent` Signed-off-by: Joel Dice <joel.dice@fermyon.com> dynamic API support for streams/futures/error-contexts Signed-off-by: Joel Dice <joel.dice@fermyon.com> support callback-less (AKA stackful) async lifts Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix `call_host` regression Signed-off-by: Joel Dice <joel.dice@fermyon.com> add component model async end-to-end tests I've ported these over from https://github.com/dicej/component-async-demo Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix test regressions and clippy warnings Signed-off-by: Joel Dice <joel.dice@fermyon.com> satisfy clippy Signed-off-by: Joel Dice <joel.dice@fermyon.com>

This adds support for loading, compiling, linking, and running components which use the [Async ABI](https://github.com/WebAssembly/component-model/blob/main/design/mvp/Async.md) along with the [`stream`, `future`, and `error-context`](WebAssembly/component-model#405) types. It also adds support for generating host bindings such that multiple host functions can be run concurrently with guest tasks -- without monopolizing the `Store`. See the [implementation RFC](bytecodealliance/rfcs#38) for details, as well as [this repo](https://github.com/dicej/component-async-demo) containing end-to-end smoke tests. Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix clippy warnings and bench/fuzzing errors Signed-off-by: Joel Dice <joel.dice@fermyon.com> revert atomic.wit whitespace change Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix build when component-model disabled Signed-off-by: Joel Dice <joel.dice@fermyon.com> bless component-macro expected output Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix no-std build error Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix build with --no-default-features --features runtime,component-model Signed-off-by: Joel Dice <joel.dice@fermyon.com> partly fix no-std build It's still broken due to the use of `std::collections::HashMap` in crates/wasmtime/src/runtime/vm/component.rs. I'll address that as part of the work to avoid exposing global task/future/stream/error-context handles to guests. Signed-off-by: Joel Dice <joel.dice@fermyon.com> maintain per-instance tables for futures, streams, and error-contexts Signed-off-by: Joel Dice <joel.dice@fermyon.com> refactor task/stream/future handle lifting/lowering This addresses a couple of issues: - Previously, we were passing task/stream/future/error-context reps directly to instances while keeping track of which instance had access to which rep. That worked fine in that there was no way to forge access to inaccessible reps, but it leaked information about what other instances were doing. Now we maintain per-instance waitable and error-context tables which map the reps to and from the handles which the instance sees. - The `no_std` build was broken due to use of `HashMap` in `runtime::vm::component`, which is now fixed. Note that we use one single table per instance for all tasks, streams, and futures. This is partly necessary because, when async events are delivered to the guest, it wouldn't have enough context to know which stream or future we're talking about if each unique stream and future type had its own table. So at minimum, we need to use the same table for all streams (regardless of payload type), and likewise for futures. Also, per WebAssembly/component-model#395 (comment), the plan is to move towards a shared table for all resource types as well, so this moves us in that direction. Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix wave breakage due to new stream/future/error-context types Signed-off-by: Joel Dice <joel.dice@fermyon.com> switch wasm-tools to v1.220.0-based branch Signed-off-by: Joel Dice <joel.dice@fermyon.com> check `task.return` type at runtime We can't statically verify a given call to `task.return` corresponds to the expected core signature appropriate for the currently running task, so we must do so at runtime. In order to make that check efficient, we intern the types. My initial plan was to use `ModuleInternedTypeIndex` and/or `VMSharedTypeIndex` for interning, but that got hairy with WasmGC considerations, so instead I added new fields to `ComponentTypes` and `ComponentTypesBuilder`. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add `TypedFunc::call_concurrent` and refine stream/future APIs This implements what I proposed in https://github.com/dicej/rfcs/blob/component-async/accepted/component-model-async.md#wasmtime. Specifically, it adds: - A new `Promise` type, useful for working with concurrent operations that require access to a `Store` to make progress. - A new `PromisesUnordered` type for `await`ing multiple promises concurrently -`TypedFunc::call_concurrent` (which returns a `Promise`), allowing multiple host->guest calls to run concurrently on the same instance. - Updated `{Stream|Future}{Writer|Reader}` APIs which use `Promise` The upshot is that the embedder can now ergonomically manage arbitrary numbers of concurrent operations. Previously, this was a lot more difficult to do without accidentally starving some of the operations due to another one monopolizing the `Store`. Finally, this includes various refactorings and fixes for bugs exposed by the newer, more versatile APIs. Signed-off-by: Joel Dice <joel.dice@fermyon.com> clean up verbosity in component/func.rs Signed-off-by: Joel Dice <joel.dice@fermyon.com> snapshot Signed-off-by: Joel Dice <joel.dice@fermyon.com> implement stream/future read/write cancellation This required a somewhat viral addition of `Send` and `Sync` bounds for async host function closure types, unfortunately. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add `Func::call_concurrent` and `LinkerInstance::func_new_concurrent` Signed-off-by: Joel Dice <joel.dice@fermyon.com> dynamic API support for streams/futures/error-contexts Signed-off-by: Joel Dice <joel.dice@fermyon.com> support callback-less (AKA stackful) async lifts Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix `call_host` regression Signed-off-by: Joel Dice <joel.dice@fermyon.com> add component model async end-to-end tests I've ported these over from https://github.com/dicej/component-async-demo Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix test regressions and clippy warnings Signed-off-by: Joel Dice <joel.dice@fermyon.com> satisfy clippy Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix async tests when `component-model-async` enabled Enabling this feature for all tests revealed various missing pieces in the new `concurrent.rs` fiber mechanism, which I've addressed. This adds a bunch of ugly `#[cfg(feature = "component-model-async")]` guards, but those will all go away once I unify the two async fiber implementations. Signed-off-by: Joel Dice <joel.dice@fermyon.com>

This adds support for loading, compiling, linking, and running components which use the [Async ABI](https://github.com/WebAssembly/component-model/blob/main/design/mvp/Async.md) along with the [`stream`, `future`, and `error-context`](WebAssembly/component-model#405) types. It also adds support for generating host bindings such that multiple host functions can be run concurrently with guest tasks -- without monopolizing the `Store`. See the [implementation RFC](bytecodealliance/rfcs#38) for details, as well as [this repo](https://github.com/dicej/component-async-demo) containing end-to-end smoke tests. Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix clippy warnings and bench/fuzzing errors Signed-off-by: Joel Dice <joel.dice@fermyon.com> revert atomic.wit whitespace change Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix build when component-model disabled Signed-off-by: Joel Dice <joel.dice@fermyon.com> bless component-macro expected output Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix no-std build error Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix build with --no-default-features --features runtime,component-model Signed-off-by: Joel Dice <joel.dice@fermyon.com> partly fix no-std build It's still broken due to the use of `std::collections::HashMap` in crates/wasmtime/src/runtime/vm/component.rs. I'll address that as part of the work to avoid exposing global task/future/stream/error-context handles to guests. Signed-off-by: Joel Dice <joel.dice@fermyon.com> maintain per-instance tables for futures, streams, and error-contexts Signed-off-by: Joel Dice <joel.dice@fermyon.com> refactor task/stream/future handle lifting/lowering This addresses a couple of issues: - Previously, we were passing task/stream/future/error-context reps directly to instances while keeping track of which instance had access to which rep. That worked fine in that there was no way to forge access to inaccessible reps, but it leaked information about what other instances were doing. Now we maintain per-instance waitable and error-context tables which map the reps to and from the handles which the instance sees. - The `no_std` build was broken due to use of `HashMap` in `runtime::vm::component`, which is now fixed. Note that we use one single table per instance for all tasks, streams, and futures. This is partly necessary because, when async events are delivered to the guest, it wouldn't have enough context to know which stream or future we're talking about if each unique stream and future type had its own table. So at minimum, we need to use the same table for all streams (regardless of payload type), and likewise for futures. Also, per WebAssembly/component-model#395 (comment), the plan is to move towards a shared table for all resource types as well, so this moves us in that direction. Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix wave breakage due to new stream/future/error-context types Signed-off-by: Joel Dice <joel.dice@fermyon.com> switch wasm-tools to v1.220.0-based branch Signed-off-by: Joel Dice <joel.dice@fermyon.com> check `task.return` type at runtime We can't statically verify a given call to `task.return` corresponds to the expected core signature appropriate for the currently running task, so we must do so at runtime. In order to make that check efficient, we intern the types. My initial plan was to use `ModuleInternedTypeIndex` and/or `VMSharedTypeIndex` for interning, but that got hairy with WasmGC considerations, so instead I added new fields to `ComponentTypes` and `ComponentTypesBuilder`. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add `TypedFunc::call_concurrent` and refine stream/future APIs This implements what I proposed in https://github.com/dicej/rfcs/blob/component-async/accepted/component-model-async.md#wasmtime. Specifically, it adds: - A new `Promise` type, useful for working with concurrent operations that require access to a `Store` to make progress. - A new `PromisesUnordered` type for `await`ing multiple promises concurrently -`TypedFunc::call_concurrent` (which returns a `Promise`), allowing multiple host->guest calls to run concurrently on the same instance. - Updated `{Stream|Future}{Writer|Reader}` APIs which use `Promise` The upshot is that the embedder can now ergonomically manage arbitrary numbers of concurrent operations. Previously, this was a lot more difficult to do without accidentally starving some of the operations due to another one monopolizing the `Store`. Finally, this includes various refactorings and fixes for bugs exposed by the newer, more versatile APIs. Signed-off-by: Joel Dice <joel.dice@fermyon.com> clean up verbosity in component/func.rs Signed-off-by: Joel Dice <joel.dice@fermyon.com> snapshot Signed-off-by: Joel Dice <joel.dice@fermyon.com> implement stream/future read/write cancellation This required a somewhat viral addition of `Send` and `Sync` bounds for async host function closure types, unfortunately. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add `Func::call_concurrent` and `LinkerInstance::func_new_concurrent` Signed-off-by: Joel Dice <joel.dice@fermyon.com> dynamic API support for streams/futures/error-contexts Signed-off-by: Joel Dice <joel.dice@fermyon.com> support callback-less (AKA stackful) async lifts Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix `call_host` regression Signed-off-by: Joel Dice <joel.dice@fermyon.com> add component model async end-to-end tests I've ported these over from https://github.com/dicej/component-async-demo Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix test regressions and clippy warnings Signed-off-by: Joel Dice <joel.dice@fermyon.com> satisfy clippy Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix async tests when `component-model-async` enabled Enabling this feature for all tests revealed various missing pieces in the new `concurrent.rs` fiber mechanism, which I've addressed. This adds a bunch of ugly `#[cfg(feature = "component-model-async")]` guards, but those will all go away once I unify the two async fiber implementations. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add and modify tests to cover concurrent APIs Primarily, this tests and implements cases where parameters and/or results must be passed via linear memory instead of the stack. Signed-off-by: Joel Dice <joel.dice@fermyon.com> `concurrent_{imports|exports}` component macro codegen tests This enables codegen testing of the `concurrent_imports` and `concurrent_exports` options to `wasmtime::component::bindgen` and also fixes code generation for world-level function and resource exports that use the concurrent call style. Signed-off-by: Joel Dice <joel.dice@fermyon.com> `concurrent_{imports|exports}` component macro expanded tests This enables testing of the `concurrent_imports` and `concurrent_exports` options in `crates/component-macro/tests/expanded.rs`. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add tests/misc_testsuite/component-model-async/*.wast These only test instantiation of components which use various async options and built-ins so far. Next, I'll happy and sad path tests which actually execute code. Signed-off-by: Joel Dice <joel.dice@fermyon.com> appease clippy Signed-off-by: Joel Dice <joel.dice@fermyon.com> add tests/misc_testsuite/component-model-async/fused.wast Signed-off-by: Joel Dice <joel.dice@fermyon.com> add non-panicking bounds checks where appropriate Signed-off-by: Joel Dice <joel.dice@fermyon.com>

This adds support for generating bindings which use the [Async ABI](https://github.com/WebAssembly/component-model/blob/main/design/mvp/Async.md) along with the [`stream`, `future`, and `error-context`](WebAssembly/component-model#405) types. By default, normal synchronous bindings are generated, but the user may opt-in to async bindings for all or some of the imported and/or exported functions in the target world and interfaces -- provided the default-enabled `async` feature is enabled. In addition, we generate `StreamPayload` and/or `FuturePayload` trait implementations for any types appearing as the `T` in `stream<T>` or `future<T>` in the WIT files, respectively. That enables user code to call `new_stream` or `new_future` to create `stream`s or `future`s with those payload types, then write to them, read from them, and/or pass the readable end as a parameter to a component import or return value of a component export. Note that I've added new `core::abi::Instruction` enum variants to handle async lifting and lowering, but they're currently tailored to the Rust generator and will probably change somewhat as we add support for other languages. This does not include any new tests; I'll add those in a follow-up commit. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add `async: true` case to Rust `codegen_tests` This ensures that all the codegen test WIT files produce compile-able bindings with `async: true` (i.e. all imports lowered and all exports lifted using the async ABI). That revealed some issues involving resource methods and constructors, as well as missing stub support, which I've resolved. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add codegen tests for futures, streams, and error-contexts Signed-off-by: Joel Dice <joel.dice@fermyon.com> remove async_support::poll_future It was both unsafe to use and intended only for testing (and not even good for that, it turns out). Signed-off-by: Joel Dice <joel.dice@fermyon.com> add stream/future read/write cancellation support Also, fix some issues with stream/future payload lifting/lowering which I _thought_ I had already tested but actually hadn't. Signed-off-by: Joel Dice <joel.dice@fermyon.com> support callback-less (AKA stackful) async lifts Signed-off-by: Joel Dice <joel.dice@fermyon.com> revert incorrect test change in flavorful/wasm.rs I had thoughtlessly removed test code based on a clippy warning, not realizing it was testing (at compile time) that the generated types implemented `Debug`. Signed-off-by: Joel Dice <joel.dice@fermyon.com> test `async: true` option in Rust codegen tests I had meant to do this originally, but apparently forgot to actually use the option. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add docs for new `debug` and `async` Rust macro options Signed-off-by: Joel Dice <joel.dice@fermyon.com> address `cargo check` lifetime warning Signed-off-by: Joel Dice <joel.dice@fermyon.com> minimize use of features based on PR feedback Signed-off-by: Joel Dice <joel.dice@fermyon.com>

* Add support for async/streams/futures to Rust generator This adds support for generating bindings which use the [Async ABI](https://github.com/WebAssembly/component-model/blob/main/design/mvp/Async.md) along with the [`stream`, `future`, and `error-context`](WebAssembly/component-model#405) types. By default, normal synchronous bindings are generated, but the user may opt-in to async bindings for all or some of the imported and/or exported functions in the target world and interfaces -- provided the default-enabled `async` feature is enabled. In addition, we generate `StreamPayload` and/or `FuturePayload` trait implementations for any types appearing as the `T` in `stream<T>` or `future<T>` in the WIT files, respectively. That enables user code to call `new_stream` or `new_future` to create `stream`s or `future`s with those payload types, then write to them, read from them, and/or pass the readable end as a parameter to a component import or return value of a component export. Note that I've added new `core::abi::Instruction` enum variants to handle async lifting and lowering, but they're currently tailored to the Rust generator and will probably change somewhat as we add support for other languages. This does not include any new tests; I'll add those in a follow-up commit. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add `async: true` case to Rust `codegen_tests` This ensures that all the codegen test WIT files produce compile-able bindings with `async: true` (i.e. all imports lowered and all exports lifted using the async ABI). That revealed some issues involving resource methods and constructors, as well as missing stub support, which I've resolved. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add codegen tests for futures, streams, and error-contexts Signed-off-by: Joel Dice <joel.dice@fermyon.com> remove async_support::poll_future It was both unsafe to use and intended only for testing (and not even good for that, it turns out). Signed-off-by: Joel Dice <joel.dice@fermyon.com> add stream/future read/write cancellation support Also, fix some issues with stream/future payload lifting/lowering which I _thought_ I had already tested but actually hadn't. Signed-off-by: Joel Dice <joel.dice@fermyon.com> support callback-less (AKA stackful) async lifts Signed-off-by: Joel Dice <joel.dice@fermyon.com> revert incorrect test change in flavorful/wasm.rs I had thoughtlessly removed test code based on a clippy warning, not realizing it was testing (at compile time) that the generated types implemented `Debug`. Signed-off-by: Joel Dice <joel.dice@fermyon.com> test `async: true` option in Rust codegen tests I had meant to do this originally, but apparently forgot to actually use the option. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add docs for new `debug` and `async` Rust macro options Signed-off-by: Joel Dice <joel.dice@fermyon.com> address `cargo check` lifetime warning Signed-off-by: Joel Dice <joel.dice@fermyon.com> minimize use of features based on PR feedback Signed-off-by: Joel Dice <joel.dice@fermyon.com> * add comment explaining lack of recursion in `type_id_info` Signed-off-by: Joel Dice <joel.dice@fermyon.com> * refactor stream and future support for Rust generator Per a discussion with Alex, this moves most of the stream and future code into the `wit-bindgen-rt` crate. That's where I had intended to put it to begin with, but ran into orphan rule issues given the trait-based approach I was using. The new approach uses dynamic dispatch via a vtable type. Thus we've traded a small (theoretical) amount of performance for much better compatibility in cases of separately-generated bindings (e.g. passing `FutureWriter<T>` between crates should work fine now), easier debugging, etc. Signed-off-by: Joel Dice <joel.dice@fermyon.com> * break `streams_and_futures` into two modules Signed-off-by: Joel Dice <joel.dice@fermyon.com> * restore previously-removed feature check in Rust macro Signed-off-by: Joel Dice <joel.dice@fermyon.com> --------- Signed-off-by: Joel Dice <joel.dice@fermyon.com>

This adds support for loading, compiling, linking, and running components which use the [Async ABI](https://github.com/WebAssembly/component-model/blob/main/design/mvp/Async.md) along with the [`stream`, `future`, and `error-context`](WebAssembly/component-model#405) types. It also adds support for generating host bindings such that multiple host functions can be run concurrently with guest tasks -- without monopolizing the `Store`. See the [implementation RFC](bytecodealliance/rfcs#38) for details, as well as [this repo](https://github.com/dicej/component-async-demo) containing end-to-end smoke tests. Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix clippy warnings and bench/fuzzing errors Signed-off-by: Joel Dice <joel.dice@fermyon.com> revert atomic.wit whitespace change Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix build when component-model disabled Signed-off-by: Joel Dice <joel.dice@fermyon.com> bless component-macro expected output Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix no-std build error Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix build with --no-default-features --features runtime,component-model Signed-off-by: Joel Dice <joel.dice@fermyon.com> partly fix no-std build It's still broken due to the use of `std::collections::HashMap` in crates/wasmtime/src/runtime/vm/component.rs. I'll address that as part of the work to avoid exposing global task/future/stream/error-context handles to guests. Signed-off-by: Joel Dice <joel.dice@fermyon.com> maintain per-instance tables for futures, streams, and error-contexts Signed-off-by: Joel Dice <joel.dice@fermyon.com> refactor task/stream/future handle lifting/lowering This addresses a couple of issues: - Previously, we were passing task/stream/future/error-context reps directly to instances while keeping track of which instance had access to which rep. That worked fine in that there was no way to forge access to inaccessible reps, but it leaked information about what other instances were doing. Now we maintain per-instance waitable and error-context tables which map the reps to and from the handles which the instance sees. - The `no_std` build was broken due to use of `HashMap` in `runtime::vm::component`, which is now fixed. Note that we use one single table per instance for all tasks, streams, and futures. This is partly necessary because, when async events are delivered to the guest, it wouldn't have enough context to know which stream or future we're talking about if each unique stream and future type had its own table. So at minimum, we need to use the same table for all streams (regardless of payload type), and likewise for futures. Also, per WebAssembly/component-model#395 (comment), the plan is to move towards a shared table for all resource types as well, so this moves us in that direction. Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix wave breakage due to new stream/future/error-context types Signed-off-by: Joel Dice <joel.dice@fermyon.com> switch wasm-tools to v1.220.0-based branch Signed-off-by: Joel Dice <joel.dice@fermyon.com> check `task.return` type at runtime We can't statically verify a given call to `task.return` corresponds to the expected core signature appropriate for the currently running task, so we must do so at runtime. In order to make that check efficient, we intern the types. My initial plan was to use `ModuleInternedTypeIndex` and/or `VMSharedTypeIndex` for interning, but that got hairy with WasmGC considerations, so instead I added new fields to `ComponentTypes` and `ComponentTypesBuilder`. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add `TypedFunc::call_concurrent` and refine stream/future APIs This implements what I proposed in https://github.com/dicej/rfcs/blob/component-async/accepted/component-model-async.md#wasmtime. Specifically, it adds: - A new `Promise` type, useful for working with concurrent operations that require access to a `Store` to make progress. - A new `PromisesUnordered` type for `await`ing multiple promises concurrently -`TypedFunc::call_concurrent` (which returns a `Promise`), allowing multiple host->guest calls to run concurrently on the same instance. - Updated `{Stream|Future}{Writer|Reader}` APIs which use `Promise` The upshot is that the embedder can now ergonomically manage arbitrary numbers of concurrent operations. Previously, this was a lot more difficult to do without accidentally starving some of the operations due to another one monopolizing the `Store`. Finally, this includes various refactorings and fixes for bugs exposed by the newer, more versatile APIs. Signed-off-by: Joel Dice <joel.dice@fermyon.com> clean up verbosity in component/func.rs Signed-off-by: Joel Dice <joel.dice@fermyon.com> snapshot Signed-off-by: Joel Dice <joel.dice@fermyon.com> implement stream/future read/write cancellation This required a somewhat viral addition of `Send` and `Sync` bounds for async host function closure types, unfortunately. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add `Func::call_concurrent` and `LinkerInstance::func_new_concurrent` Signed-off-by: Joel Dice <joel.dice@fermyon.com> dynamic API support for streams/futures/error-contexts Signed-off-by: Joel Dice <joel.dice@fermyon.com> support callback-less (AKA stackful) async lifts Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix `call_host` regression Signed-off-by: Joel Dice <joel.dice@fermyon.com> add component model async end-to-end tests I've ported these over from https://github.com/dicej/component-async-demo Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix test regressions and clippy warnings Signed-off-by: Joel Dice <joel.dice@fermyon.com> satisfy clippy Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix async tests when `component-model-async` enabled Enabling this feature for all tests revealed various missing pieces in the new `concurrent.rs` fiber mechanism, which I've addressed. This adds a bunch of ugly `#[cfg(feature = "component-model-async")]` guards, but those will all go away once I unify the two async fiber implementations. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add and modify tests to cover concurrent APIs Primarily, this tests and implements cases where parameters and/or results must be passed via linear memory instead of the stack. Signed-off-by: Joel Dice <joel.dice@fermyon.com> `concurrent_{imports|exports}` component macro codegen tests This enables codegen testing of the `concurrent_imports` and `concurrent_exports` options to `wasmtime::component::bindgen` and also fixes code generation for world-level function and resource exports that use the concurrent call style. Signed-off-by: Joel Dice <joel.dice@fermyon.com> `concurrent_{imports|exports}` component macro expanded tests This enables testing of the `concurrent_imports` and `concurrent_exports` options in `crates/component-macro/tests/expanded.rs`. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add tests/misc_testsuite/component-model-async/*.wast These only test instantiation of components which use various async options and built-ins so far. Next, I'll happy and sad path tests which actually execute code. Signed-off-by: Joel Dice <joel.dice@fermyon.com> appease clippy Signed-off-by: Joel Dice <joel.dice@fermyon.com> add tests/misc_testsuite/component-model-async/fused.wast Signed-off-by: Joel Dice <joel.dice@fermyon.com> add non-panicking bounds checks where appropriate Signed-off-by: Joel Dice <joel.dice@fermyon.com> remove post-return bits from async result lift code ...at least until we've determined whether post-return options even make sense for async-lifted exports. Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix component-model-async/fused.wast test failure Signed-off-by: Joel Dice <joel.dice@fermyon.com> use `enum` types to represent status and event codes Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix component-model-async/fused.wast test failure (2nd try) Signed-off-by: Joel Dice <joel.dice@fermyon.com> use `gc_types = true` in component-model-async/fused.wast We use `Instruction::RefFunc` when generating adapters for async lifts and/or lowers, which Winch doesn't understand, and apparently `gc_types = true` is what tells the test infra not to use Winch. Signed-off-by: Joel Dice <joel.dice@fermyon.com> trap if async function finishes without calling `task.return` Signed-off-by: Joel Dice <joel.dice@fermyon.com> update wit-bindgen and fix rebase damage Signed-off-by: Joel Dice <joel.dice@fermyon.com> call post-return function if any for async->sync fused calls Signed-off-by: Joel Dice <joel.dice@fermyon.com>

This adds support for loading, compiling, linking, and running components which use the [Async ABI](https://github.com/WebAssembly/component-model/blob/main/design/mvp/Async.md) along with the [`stream`, `future`, and `error-context`](WebAssembly/component-model#405) types. It also adds support for generating host bindings such that multiple host functions can be run concurrently with guest tasks -- without monopolizing the `Store`. See the [implementation RFC](bytecodealliance/rfcs#38) for details, as well as [this repo](https://github.com/dicej/component-async-demo) containing end-to-end smoke tests. Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix clippy warnings and bench/fuzzing errors Signed-off-by: Joel Dice <joel.dice@fermyon.com> revert atomic.wit whitespace change Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix build when component-model disabled Signed-off-by: Joel Dice <joel.dice@fermyon.com> bless component-macro expected output Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix no-std build error Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix build with --no-default-features --features runtime,component-model Signed-off-by: Joel Dice <joel.dice@fermyon.com> partly fix no-std build It's still broken due to the use of `std::collections::HashMap` in crates/wasmtime/src/runtime/vm/component.rs. I'll address that as part of the work to avoid exposing global task/future/stream/error-context handles to guests. Signed-off-by: Joel Dice <joel.dice@fermyon.com> maintain per-instance tables for futures, streams, and error-contexts Signed-off-by: Joel Dice <joel.dice@fermyon.com> refactor task/stream/future handle lifting/lowering This addresses a couple of issues: - Previously, we were passing task/stream/future/error-context reps directly to instances while keeping track of which instance had access to which rep. That worked fine in that there was no way to forge access to inaccessible reps, but it leaked information about what other instances were doing. Now we maintain per-instance waitable and error-context tables which map the reps to and from the handles which the instance sees. - The `no_std` build was broken due to use of `HashMap` in `runtime::vm::component`, which is now fixed. Note that we use one single table per instance for all tasks, streams, and futures. This is partly necessary because, when async events are delivered to the guest, it wouldn't have enough context to know which stream or future we're talking about if each unique stream and future type had its own table. So at minimum, we need to use the same table for all streams (regardless of payload type), and likewise for futures. Also, per WebAssembly/component-model#395 (comment), the plan is to move towards a shared table for all resource types as well, so this moves us in that direction. Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix wave breakage due to new stream/future/error-context types Signed-off-by: Joel Dice <joel.dice@fermyon.com> switch wasm-tools to v1.220.0-based branch Signed-off-by: Joel Dice <joel.dice@fermyon.com> check `task.return` type at runtime We can't statically verify a given call to `task.return` corresponds to the expected core signature appropriate for the currently running task, so we must do so at runtime. In order to make that check efficient, we intern the types. My initial plan was to use `ModuleInternedTypeIndex` and/or `VMSharedTypeIndex` for interning, but that got hairy with WasmGC considerations, so instead I added new fields to `ComponentTypes` and `ComponentTypesBuilder`. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add `TypedFunc::call_concurrent` and refine stream/future APIs This implements what I proposed in https://github.com/dicej/rfcs/blob/component-async/accepted/component-model-async.md#wasmtime. Specifically, it adds: - A new `Promise` type, useful for working with concurrent operations that require access to a `Store` to make progress. - A new `PromisesUnordered` type for `await`ing multiple promises concurrently -`TypedFunc::call_concurrent` (which returns a `Promise`), allowing multiple host->guest calls to run concurrently on the same instance. - Updated `{Stream|Future}{Writer|Reader}` APIs which use `Promise` The upshot is that the embedder can now ergonomically manage arbitrary numbers of concurrent operations. Previously, this was a lot more difficult to do without accidentally starving some of the operations due to another one monopolizing the `Store`. Finally, this includes various refactorings and fixes for bugs exposed by the newer, more versatile APIs. Signed-off-by: Joel Dice <joel.dice@fermyon.com> clean up verbosity in component/func.rs Signed-off-by: Joel Dice <joel.dice@fermyon.com> snapshot Signed-off-by: Joel Dice <joel.dice@fermyon.com> implement stream/future read/write cancellation This required a somewhat viral addition of `Send` and `Sync` bounds for async host function closure types, unfortunately. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add `Func::call_concurrent` and `LinkerInstance::func_new_concurrent` Signed-off-by: Joel Dice <joel.dice@fermyon.com> dynamic API support for streams/futures/error-contexts Signed-off-by: Joel Dice <joel.dice@fermyon.com> support callback-less (AKA stackful) async lifts Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix `call_host` regression Signed-off-by: Joel Dice <joel.dice@fermyon.com> add component model async end-to-end tests I've ported these over from https://github.com/dicej/component-async-demo Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix test regressions and clippy warnings Signed-off-by: Joel Dice <joel.dice@fermyon.com> satisfy clippy Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix async tests when `component-model-async` enabled Enabling this feature for all tests revealed various missing pieces in the new `concurrent.rs` fiber mechanism, which I've addressed. This adds a bunch of ugly `#[cfg(feature = "component-model-async")]` guards, but those will all go away once I unify the two async fiber implementations. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add and modify tests to cover concurrent APIs Primarily, this tests and implements cases where parameters and/or results must be passed via linear memory instead of the stack. Signed-off-by: Joel Dice <joel.dice@fermyon.com> `concurrent_{imports|exports}` component macro codegen tests This enables codegen testing of the `concurrent_imports` and `concurrent_exports` options to `wasmtime::component::bindgen` and also fixes code generation for world-level function and resource exports that use the concurrent call style. Signed-off-by: Joel Dice <joel.dice@fermyon.com> `concurrent_{imports|exports}` component macro expanded tests This enables testing of the `concurrent_imports` and `concurrent_exports` options in `crates/component-macro/tests/expanded.rs`. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add tests/misc_testsuite/component-model-async/*.wast These only test instantiation of components which use various async options and built-ins so far. Next, I'll happy and sad path tests which actually execute code. Signed-off-by: Joel Dice <joel.dice@fermyon.com> appease clippy Signed-off-by: Joel Dice <joel.dice@fermyon.com> add tests/misc_testsuite/component-model-async/fused.wast Signed-off-by: Joel Dice <joel.dice@fermyon.com> add non-panicking bounds checks where appropriate Signed-off-by: Joel Dice <joel.dice@fermyon.com> remove post-return bits from async result lift code ...at least until we've determined whether post-return options even make sense for async-lifted exports. Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix component-model-async/fused.wast test failure Signed-off-by: Joel Dice <joel.dice@fermyon.com> use `enum` types to represent status and event codes Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix component-model-async/fused.wast test failure (2nd try) Signed-off-by: Joel Dice <joel.dice@fermyon.com> use `gc_types = true` in component-model-async/fused.wast We use `Instruction::RefFunc` when generating adapters for async lifts and/or lowers, which Winch doesn't understand, and apparently `gc_types = true` is what tells the test infra not to use Winch. Signed-off-by: Joel Dice <joel.dice@fermyon.com> trap if async function finishes without calling `task.return` Signed-off-by: Joel Dice <joel.dice@fermyon.com> update wit-bindgen and fix rebase damage Signed-off-by: Joel Dice <joel.dice@fermyon.com> call post-return function if any for async->sync fused calls Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix non-component-model-async build; appease clippy Signed-off-by: Joel Dice <joel.dice@fermyon.com> bless bindgen output whitespace changes Signed-off-by: Joel Dice <joel.dice@fermyon.com> enforce resource borrow requirements for async calls Signed-off-by: Joel Dice <joel.dice@fermyon.com> update `wit-bindgen` and simplify `async_borrowing_callee` test Signed-off-by: Joel Dice <joel.dice@fermyon.com> call `InstanceFlags::set_may_enter` where appropriate There's still more work to do to fully implement (and test) the reentrance rules for concurrent tasks, but this is a start. Signed-off-by: Joel Dice <joel.dice@fermyon.com> finish implementing reentrance checks Signed-off-by: Joel Dice <joel.dice@fermyon.com>

This adds support for loading, compiling, linking, and running components which use the [Async ABI](https://github.com/WebAssembly/component-model/blob/main/design/mvp/Async.md) along with the [`stream`, `future`, and `error-context`](WebAssembly/component-model#405) types. It also adds support for generating host bindings such that multiple host functions can be run concurrently with guest tasks -- without monopolizing the `Store`. See the [implementation RFC](bytecodealliance/rfcs#38) for details, as well as [this repo](https://github.com/dicej/component-async-demo) containing end-to-end smoke tests. Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix clippy warnings and bench/fuzzing errors Signed-off-by: Joel Dice <joel.dice@fermyon.com> revert atomic.wit whitespace change Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix build when component-model disabled Signed-off-by: Joel Dice <joel.dice@fermyon.com> bless component-macro expected output Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix no-std build error Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix build with --no-default-features --features runtime,component-model Signed-off-by: Joel Dice <joel.dice@fermyon.com> partly fix no-std build It's still broken due to the use of `std::collections::HashMap` in crates/wasmtime/src/runtime/vm/component.rs. I'll address that as part of the work to avoid exposing global task/future/stream/error-context handles to guests. Signed-off-by: Joel Dice <joel.dice@fermyon.com> maintain per-instance tables for futures, streams, and error-contexts Signed-off-by: Joel Dice <joel.dice@fermyon.com> refactor task/stream/future handle lifting/lowering This addresses a couple of issues: - Previously, we were passing task/stream/future/error-context reps directly to instances while keeping track of which instance had access to which rep. That worked fine in that there was no way to forge access to inaccessible reps, but it leaked information about what other instances were doing. Now we maintain per-instance waitable and error-context tables which map the reps to and from the handles which the instance sees. - The `no_std` build was broken due to use of `HashMap` in `runtime::vm::component`, which is now fixed. Note that we use one single table per instance for all tasks, streams, and futures. This is partly necessary because, when async events are delivered to the guest, it wouldn't have enough context to know which stream or future we're talking about if each unique stream and future type had its own table. So at minimum, we need to use the same table for all streams (regardless of payload type), and likewise for futures. Also, per WebAssembly/component-model#395 (comment), the plan is to move towards a shared table for all resource types as well, so this moves us in that direction. Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix wave breakage due to new stream/future/error-context types Signed-off-by: Joel Dice <joel.dice@fermyon.com> switch wasm-tools to v1.220.0-based branch Signed-off-by: Joel Dice <joel.dice@fermyon.com> check `task.return` type at runtime We can't statically verify a given call to `task.return` corresponds to the expected core signature appropriate for the currently running task, so we must do so at runtime. In order to make that check efficient, we intern the types. My initial plan was to use `ModuleInternedTypeIndex` and/or `VMSharedTypeIndex` for interning, but that got hairy with WasmGC considerations, so instead I added new fields to `ComponentTypes` and `ComponentTypesBuilder`. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add `TypedFunc::call_concurrent` and refine stream/future APIs This implements what I proposed in https://github.com/dicej/rfcs/blob/component-async/accepted/component-model-async.md#wasmtime. Specifically, it adds: - A new `Promise` type, useful for working with concurrent operations that require access to a `Store` to make progress. - A new `PromisesUnordered` type for `await`ing multiple promises concurrently -`TypedFunc::call_concurrent` (which returns a `Promise`), allowing multiple host->guest calls to run concurrently on the same instance. - Updated `{Stream|Future}{Writer|Reader}` APIs which use `Promise` The upshot is that the embedder can now ergonomically manage arbitrary numbers of concurrent operations. Previously, this was a lot more difficult to do without accidentally starving some of the operations due to another one monopolizing the `Store`. Finally, this includes various refactorings and fixes for bugs exposed by the newer, more versatile APIs. Signed-off-by: Joel Dice <joel.dice@fermyon.com> clean up verbosity in component/func.rs Signed-off-by: Joel Dice <joel.dice@fermyon.com> snapshot Signed-off-by: Joel Dice <joel.dice@fermyon.com> implement stream/future read/write cancellation This required a somewhat viral addition of `Send` and `Sync` bounds for async host function closure types, unfortunately. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add `Func::call_concurrent` and `LinkerInstance::func_new_concurrent` Signed-off-by: Joel Dice <joel.dice@fermyon.com> dynamic API support for streams/futures/error-contexts Signed-off-by: Joel Dice <joel.dice@fermyon.com> support callback-less (AKA stackful) async lifts Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix `call_host` regression Signed-off-by: Joel Dice <joel.dice@fermyon.com> add component model async end-to-end tests I've ported these over from https://github.com/dicej/component-async-demo Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix test regressions and clippy warnings Signed-off-by: Joel Dice <joel.dice@fermyon.com> satisfy clippy Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix async tests when `component-model-async` enabled Enabling this feature for all tests revealed various missing pieces in the new `concurrent.rs` fiber mechanism, which I've addressed. This adds a bunch of ugly `#[cfg(feature = "component-model-async")]` guards, but those will all go away once I unify the two async fiber implementations. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add and modify tests to cover concurrent APIs Primarily, this tests and implements cases where parameters and/or results must be passed via linear memory instead of the stack. Signed-off-by: Joel Dice <joel.dice@fermyon.com> `concurrent_{imports|exports}` component macro codegen tests This enables codegen testing of the `concurrent_imports` and `concurrent_exports` options to `wasmtime::component::bindgen` and also fixes code generation for world-level function and resource exports that use the concurrent call style. Signed-off-by: Joel Dice <joel.dice@fermyon.com> `concurrent_{imports|exports}` component macro expanded tests This enables testing of the `concurrent_imports` and `concurrent_exports` options in `crates/component-macro/tests/expanded.rs`. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add tests/misc_testsuite/component-model-async/*.wast These only test instantiation of components which use various async options and built-ins so far. Next, I'll happy and sad path tests which actually execute code. Signed-off-by: Joel Dice <joel.dice@fermyon.com> appease clippy Signed-off-by: Joel Dice <joel.dice@fermyon.com> add tests/misc_testsuite/component-model-async/fused.wast Signed-off-by: Joel Dice <joel.dice@fermyon.com> add non-panicking bounds checks where appropriate Signed-off-by: Joel Dice <joel.dice@fermyon.com> remove post-return bits from async result lift code ...at least until we've determined whether post-return options even make sense for async-lifted exports. Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix component-model-async/fused.wast test failure Signed-off-by: Joel Dice <joel.dice@fermyon.com> use `enum` types to represent status and event codes Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix component-model-async/fused.wast test failure (2nd try) Signed-off-by: Joel Dice <joel.dice@fermyon.com> use `gc_types = true` in component-model-async/fused.wast We use `Instruction::RefFunc` when generating adapters for async lifts and/or lowers, which Winch doesn't understand, and apparently `gc_types = true` is what tells the test infra not to use Winch. Signed-off-by: Joel Dice <joel.dice@fermyon.com> trap if async function finishes without calling `task.return` Signed-off-by: Joel Dice <joel.dice@fermyon.com> update wit-bindgen and fix rebase damage Signed-off-by: Joel Dice <joel.dice@fermyon.com> call post-return function if any for async->sync fused calls Signed-off-by: Joel Dice <joel.dice@fermyon.com>

This adds support for loading, compiling, linking, and running components which use the [Async ABI](https://github.com/WebAssembly/component-model/blob/main/design/mvp/Async.md) along with the [`stream`, `future`, and `error-context`](WebAssembly/component-model#405) types. It also adds support for generating host bindings such that multiple host functions can be run concurrently with guest tasks -- without monopolizing the `Store`. See the [implementation RFC](bytecodealliance/rfcs#38) for details, as well as [this repo](https://github.com/dicej/component-async-demo) containing end-to-end smoke tests. Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix clippy warnings and bench/fuzzing errors Signed-off-by: Joel Dice <joel.dice@fermyon.com> revert atomic.wit whitespace change Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix build when component-model disabled Signed-off-by: Joel Dice <joel.dice@fermyon.com> bless component-macro expected output Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix no-std build error Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix build with --no-default-features --features runtime,component-model Signed-off-by: Joel Dice <joel.dice@fermyon.com> partly fix no-std build It's still broken due to the use of `std::collections::HashMap` in crates/wasmtime/src/runtime/vm/component.rs. I'll address that as part of the work to avoid exposing global task/future/stream/error-context handles to guests. Signed-off-by: Joel Dice <joel.dice@fermyon.com> maintain per-instance tables for futures, streams, and error-contexts Signed-off-by: Joel Dice <joel.dice@fermyon.com> refactor task/stream/future handle lifting/lowering This addresses a couple of issues: - Previously, we were passing task/stream/future/error-context reps directly to instances while keeping track of which instance had access to which rep. That worked fine in that there was no way to forge access to inaccessible reps, but it leaked information about what other instances were doing. Now we maintain per-instance waitable and error-context tables which map the reps to and from the handles which the instance sees. - The `no_std` build was broken due to use of `HashMap` in `runtime::vm::component`, which is now fixed. Note that we use one single table per instance for all tasks, streams, and futures. This is partly necessary because, when async events are delivered to the guest, it wouldn't have enough context to know which stream or future we're talking about if each unique stream and future type had its own table. So at minimum, we need to use the same table for all streams (regardless of payload type), and likewise for futures. Also, per WebAssembly/component-model#395 (comment), the plan is to move towards a shared table for all resource types as well, so this moves us in that direction. Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix wave breakage due to new stream/future/error-context types Signed-off-by: Joel Dice <joel.dice@fermyon.com> switch wasm-tools to v1.220.0-based branch Signed-off-by: Joel Dice <joel.dice@fermyon.com> check `task.return` type at runtime We can't statically verify a given call to `task.return` corresponds to the expected core signature appropriate for the currently running task, so we must do so at runtime. In order to make that check efficient, we intern the types. My initial plan was to use `ModuleInternedTypeIndex` and/or `VMSharedTypeIndex` for interning, but that got hairy with WasmGC considerations, so instead I added new fields to `ComponentTypes` and `ComponentTypesBuilder`. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add `TypedFunc::call_concurrent` and refine stream/future APIs This implements what I proposed in https://github.com/dicej/rfcs/blob/component-async/accepted/component-model-async.md#wasmtime. Specifically, it adds: - A new `Promise` type, useful for working with concurrent operations that require access to a `Store` to make progress. - A new `PromisesUnordered` type for `await`ing multiple promises concurrently -`TypedFunc::call_concurrent` (which returns a `Promise`), allowing multiple host->guest calls to run concurrently on the same instance. - Updated `{Stream|Future}{Writer|Reader}` APIs which use `Promise` The upshot is that the embedder can now ergonomically manage arbitrary numbers of concurrent operations. Previously, this was a lot more difficult to do without accidentally starving some of the operations due to another one monopolizing the `Store`. Finally, this includes various refactorings and fixes for bugs exposed by the newer, more versatile APIs. Signed-off-by: Joel Dice <joel.dice@fermyon.com> clean up verbosity in component/func.rs Signed-off-by: Joel Dice <joel.dice@fermyon.com> snapshot Signed-off-by: Joel Dice <joel.dice@fermyon.com> implement stream/future read/write cancellation This required a somewhat viral addition of `Send` and `Sync` bounds for async host function closure types, unfortunately. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add `Func::call_concurrent` and `LinkerInstance::func_new_concurrent` Signed-off-by: Joel Dice <joel.dice@fermyon.com> dynamic API support for streams/futures/error-contexts Signed-off-by: Joel Dice <joel.dice@fermyon.com> support callback-less (AKA stackful) async lifts Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix `call_host` regression Signed-off-by: Joel Dice <joel.dice@fermyon.com> add component model async end-to-end tests I've ported these over from https://github.com/dicej/component-async-demo Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix test regressions and clippy warnings Signed-off-by: Joel Dice <joel.dice@fermyon.com> satisfy clippy Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix async tests when `component-model-async` enabled Enabling this feature for all tests revealed various missing pieces in the new `concurrent.rs` fiber mechanism, which I've addressed. This adds a bunch of ugly `#[cfg(feature = "component-model-async")]` guards, but those will all go away once I unify the two async fiber implementations. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add and modify tests to cover concurrent APIs Primarily, this tests and implements cases where parameters and/or results must be passed via linear memory instead of the stack. Signed-off-by: Joel Dice <joel.dice@fermyon.com> `concurrent_{imports|exports}` component macro codegen tests This enables codegen testing of the `concurrent_imports` and `concurrent_exports` options to `wasmtime::component::bindgen` and also fixes code generation for world-level function and resource exports that use the concurrent call style. Signed-off-by: Joel Dice <joel.dice@fermyon.com> `concurrent_{imports|exports}` component macro expanded tests This enables testing of the `concurrent_imports` and `concurrent_exports` options in `crates/component-macro/tests/expanded.rs`. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add tests/misc_testsuite/component-model-async/*.wast These only test instantiation of components which use various async options and built-ins so far. Next, I'll happy and sad path tests which actually execute code. Signed-off-by: Joel Dice <joel.dice@fermyon.com> appease clippy Signed-off-by: Joel Dice <joel.dice@fermyon.com> add tests/misc_testsuite/component-model-async/fused.wast Signed-off-by: Joel Dice <joel.dice@fermyon.com> add non-panicking bounds checks where appropriate Signed-off-by: Joel Dice <joel.dice@fermyon.com> remove post-return bits from async result lift code ...at least until we've determined whether post-return options even make sense for async-lifted exports. Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix component-model-async/fused.wast test failure Signed-off-by: Joel Dice <joel.dice@fermyon.com> use `enum` types to represent status and event codes Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix component-model-async/fused.wast test failure (2nd try) Signed-off-by: Joel Dice <joel.dice@fermyon.com> use `gc_types = true` in component-model-async/fused.wast We use `Instruction::RefFunc` when generating adapters for async lifts and/or lowers, which Winch doesn't understand, and apparently `gc_types = true` is what tells the test infra not to use Winch. Signed-off-by: Joel Dice <joel.dice@fermyon.com> trap if async function finishes without calling `task.return` Signed-off-by: Joel Dice <joel.dice@fermyon.com> update wit-bindgen and fix rebase damage Signed-off-by: Joel Dice <joel.dice@fermyon.com> call post-return function if any for async->sync fused calls Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix non-component-model-async build; appease clippy Signed-off-by: Joel Dice <joel.dice@fermyon.com> bless bindgen output whitespace changes Signed-off-by: Joel Dice <joel.dice@fermyon.com> enforce resource borrow requirements for async calls Signed-off-by: Joel Dice <joel.dice@fermyon.com> update `wit-bindgen` and simplify `async_borrowing_callee` test Signed-off-by: Joel Dice <joel.dice@fermyon.com> call `InstanceFlags::set_may_enter` where appropriate There's still more work to do to fully implement (and test) the reentrance rules for concurrent tasks, but this is a start. Signed-off-by: Joel Dice <joel.dice@fermyon.com> finish implementing reentrance checks Signed-off-by: Joel Dice <joel.dice@fermyon.com> feat: implement error-context (#1) * feat: initial error-context implementation This commit implements error-context related functions inside the VM, along with tests to ensure that basic error-context.new and error-context.debug-message functionality works. Signed-off-by: Victor Adossi <vadossi@cosmonic.com> * wip: add test for error context callee/caller transfer Signed-off-by: Victor Adossi <vadossi@cosmonic.com> * wip: test for async context transfer Signed-off-by: Victor Adossi <vadossi@cosmonic.com> --------- Signed-off-by: Victor Adossi <vadossi@cosmonic.com> run cargo fmt Signed-off-by: Joel Dice <joel.dice@fermyon.com> appease clippy Signed-off-by: Joel Dice <joel.dice@fermyon.com> pull in Roman's unit stream work; add world-level export test Signed-off-by: Joel Dice <joel.dice@fermyon.com>

This adds support for loading, compiling, linking, and running components which use the [Async ABI](https://github.com/WebAssembly/component-model/blob/main/design/mvp/Async.md) along with the [`stream`, `future`, and `error-context`](WebAssembly/component-model#405) types. It also adds support for generating host bindings such that multiple host functions can be run concurrently with guest tasks -- without monopolizing the `Store`. See the [implementation RFC](bytecodealliance/rfcs#38) for details, as well as [this repo](https://github.com/dicej/component-async-demo) containing end-to-end smoke tests. Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix clippy warnings and bench/fuzzing errors Signed-off-by: Joel Dice <joel.dice@fermyon.com> revert atomic.wit whitespace change Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix build when component-model disabled Signed-off-by: Joel Dice <joel.dice@fermyon.com> bless component-macro expected output Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix no-std build error Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix build with --no-default-features --features runtime,component-model Signed-off-by: Joel Dice <joel.dice@fermyon.com> partly fix no-std build It's still broken due to the use of `std::collections::HashMap` in crates/wasmtime/src/runtime/vm/component.rs. I'll address that as part of the work to avoid exposing global task/future/stream/error-context handles to guests. Signed-off-by: Joel Dice <joel.dice@fermyon.com> maintain per-instance tables for futures, streams, and error-contexts Signed-off-by: Joel Dice <joel.dice@fermyon.com> refactor task/stream/future handle lifting/lowering This addresses a couple of issues: - Previously, we were passing task/stream/future/error-context reps directly to instances while keeping track of which instance had access to which rep. That worked fine in that there was no way to forge access to inaccessible reps, but it leaked information about what other instances were doing. Now we maintain per-instance waitable and error-context tables which map the reps to and from the handles which the instance sees. - The `no_std` build was broken due to use of `HashMap` in `runtime::vm::component`, which is now fixed. Note that we use one single table per instance for all tasks, streams, and futures. This is partly necessary because, when async events are delivered to the guest, it wouldn't have enough context to know which stream or future we're talking about if each unique stream and future type had its own table. So at minimum, we need to use the same table for all streams (regardless of payload type), and likewise for futures. Also, per WebAssembly/component-model#395 (comment), the plan is to move towards a shared table for all resource types as well, so this moves us in that direction. Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix wave breakage due to new stream/future/error-context types Signed-off-by: Joel Dice <joel.dice@fermyon.com> switch wasm-tools to v1.220.0-based branch Signed-off-by: Joel Dice <joel.dice@fermyon.com> check `task.return` type at runtime We can't statically verify a given call to `task.return` corresponds to the expected core signature appropriate for the currently running task, so we must do so at runtime. In order to make that check efficient, we intern the types. My initial plan was to use `ModuleInternedTypeIndex` and/or `VMSharedTypeIndex` for interning, but that got hairy with WasmGC considerations, so instead I added new fields to `ComponentTypes` and `ComponentTypesBuilder`. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add `TypedFunc::call_concurrent` and refine stream/future APIs This implements what I proposed in https://github.com/dicej/rfcs/blob/component-async/accepted/component-model-async.md#wasmtime. Specifically, it adds: - A new `Promise` type, useful for working with concurrent operations that require access to a `Store` to make progress. - A new `PromisesUnordered` type for `await`ing multiple promises concurrently -`TypedFunc::call_concurrent` (which returns a `Promise`), allowing multiple host->guest calls to run concurrently on the same instance. - Updated `{Stream|Future}{Writer|Reader}` APIs which use `Promise` The upshot is that the embedder can now ergonomically manage arbitrary numbers of concurrent operations. Previously, this was a lot more difficult to do without accidentally starving some of the operations due to another one monopolizing the `Store`. Finally, this includes various refactorings and fixes for bugs exposed by the newer, more versatile APIs. Signed-off-by: Joel Dice <joel.dice@fermyon.com> clean up verbosity in component/func.rs Signed-off-by: Joel Dice <joel.dice@fermyon.com> snapshot Signed-off-by: Joel Dice <joel.dice@fermyon.com> implement stream/future read/write cancellation This required a somewhat viral addition of `Send` and `Sync` bounds for async host function closure types, unfortunately. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add `Func::call_concurrent` and `LinkerInstance::func_new_concurrent` Signed-off-by: Joel Dice <joel.dice@fermyon.com> dynamic API support for streams/futures/error-contexts Signed-off-by: Joel Dice <joel.dice@fermyon.com> support callback-less (AKA stackful) async lifts Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix `call_host` regression Signed-off-by: Joel Dice <joel.dice@fermyon.com> add component model async end-to-end tests I've ported these over from https://github.com/dicej/component-async-demo Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix test regressions and clippy warnings Signed-off-by: Joel Dice <joel.dice@fermyon.com> satisfy clippy Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix async tests when `component-model-async` enabled Enabling this feature for all tests revealed various missing pieces in the new `concurrent.rs` fiber mechanism, which I've addressed. This adds a bunch of ugly `#[cfg(feature = "component-model-async")]` guards, but those will all go away once I unify the two async fiber implementations. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add and modify tests to cover concurrent APIs Primarily, this tests and implements cases where parameters and/or results must be passed via linear memory instead of the stack. Signed-off-by: Joel Dice <joel.dice@fermyon.com> `concurrent_{imports|exports}` component macro codegen tests This enables codegen testing of the `concurrent_imports` and `concurrent_exports` options to `wasmtime::component::bindgen` and also fixes code generation for world-level function and resource exports that use the concurrent call style. Signed-off-by: Joel Dice <joel.dice@fermyon.com> `concurrent_{imports|exports}` component macro expanded tests This enables testing of the `concurrent_imports` and `concurrent_exports` options in `crates/component-macro/tests/expanded.rs`. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add tests/misc_testsuite/component-model-async/*.wast These only test instantiation of components which use various async options and built-ins so far. Next, I'll happy and sad path tests which actually execute code. Signed-off-by: Joel Dice <joel.dice@fermyon.com> appease clippy Signed-off-by: Joel Dice <joel.dice@fermyon.com> add tests/misc_testsuite/component-model-async/fused.wast Signed-off-by: Joel Dice <joel.dice@fermyon.com> add non-panicking bounds checks where appropriate Signed-off-by: Joel Dice <joel.dice@fermyon.com> remove post-return bits from async result lift code ...at least until we've determined whether post-return options even make sense for async-lifted exports. Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix component-model-async/fused.wast test failure Signed-off-by: Joel Dice <joel.dice@fermyon.com> use `enum` types to represent status and event codes Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix component-model-async/fused.wast test failure (2nd try) Signed-off-by: Joel Dice <joel.dice@fermyon.com> use `gc_types = true` in component-model-async/fused.wast We use `Instruction::RefFunc` when generating adapters for async lifts and/or lowers, which Winch doesn't understand, and apparently `gc_types = true` is what tells the test infra not to use Winch. Signed-off-by: Joel Dice <joel.dice@fermyon.com> trap if async function finishes without calling `task.return` Signed-off-by: Joel Dice <joel.dice@fermyon.com> update wit-bindgen and fix rebase damage Signed-off-by: Joel Dice <joel.dice@fermyon.com> call post-return function if any for async->sync fused calls Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix non-component-model-async build; appease clippy Signed-off-by: Joel Dice <joel.dice@fermyon.com> bless bindgen output whitespace changes Signed-off-by: Joel Dice <joel.dice@fermyon.com> enforce resource borrow requirements for async calls Signed-off-by: Joel Dice <joel.dice@fermyon.com> update `wit-bindgen` and simplify `async_borrowing_callee` test Signed-off-by: Joel Dice <joel.dice@fermyon.com> call `InstanceFlags::set_may_enter` where appropriate There's still more work to do to fully implement (and test) the reentrance rules for concurrent tasks, but this is a start. Signed-off-by: Joel Dice <joel.dice@fermyon.com> finish implementing reentrance checks Signed-off-by: Joel Dice <joel.dice@fermyon.com> feat: implement error-context (#1) * feat: initial error-context implementation This commit implements error-context related functions inside the VM, along with tests to ensure that basic error-context.new and error-context.debug-message functionality works. Signed-off-by: Victor Adossi <vadossi@cosmonic.com> * wip: add test for error context callee/caller transfer Signed-off-by: Victor Adossi <vadossi@cosmonic.com> * wip: test for async context transfer Signed-off-by: Victor Adossi <vadossi@cosmonic.com> --------- Signed-off-by: Victor Adossi <vadossi@cosmonic.com> run cargo fmt Signed-off-by: Joel Dice <joel.dice@fermyon.com> appease clippy Signed-off-by: Joel Dice <joel.dice@fermyon.com> pull in Roman's unit stream work; add world-level export test Signed-off-by: Joel Dice <joel.dice@fermyon.com> add unit stream tests Signed-off-by: Joel Dice <joel.dice@fermyon.com>

This adds support for loading, compiling, linking, and running components which use the [Async ABI](https://github.com/WebAssembly/component-model/blob/main/design/mvp/Async.md) along with the [`stream`, `future`, and `error-context`](WebAssembly/component-model#405) types. It also adds support for generating host bindings such that multiple host functions can be run concurrently with guest tasks -- without monopolizing the `Store`. See the [implementation RFC](bytecodealliance/rfcs#38) for details, as well as [this repo](https://github.com/dicej/component-async-demo) containing end-to-end smoke tests. Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix clippy warnings and bench/fuzzing errors Signed-off-by: Joel Dice <joel.dice@fermyon.com> revert atomic.wit whitespace change Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix build when component-model disabled Signed-off-by: Joel Dice <joel.dice@fermyon.com> bless component-macro expected output Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix no-std build error Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix build with --no-default-features --features runtime,component-model Signed-off-by: Joel Dice <joel.dice@fermyon.com> partly fix no-std build It's still broken due to the use of `std::collections::HashMap` in crates/wasmtime/src/runtime/vm/component.rs. I'll address that as part of the work to avoid exposing global task/future/stream/error-context handles to guests. Signed-off-by: Joel Dice <joel.dice@fermyon.com> maintain per-instance tables for futures, streams, and error-contexts Signed-off-by: Joel Dice <joel.dice@fermyon.com> refactor task/stream/future handle lifting/lowering This addresses a couple of issues: - Previously, we were passing task/stream/future/error-context reps directly to instances while keeping track of which instance had access to which rep. That worked fine in that there was no way to forge access to inaccessible reps, but it leaked information about what other instances were doing. Now we maintain per-instance waitable and error-context tables which map the reps to and from the handles which the instance sees. - The `no_std` build was broken due to use of `HashMap` in `runtime::vm::component`, which is now fixed. Note that we use one single table per instance for all tasks, streams, and futures. This is partly necessary because, when async events are delivered to the guest, it wouldn't have enough context to know which stream or future we're talking about if each unique stream and future type had its own table. So at minimum, we need to use the same table for all streams (regardless of payload type), and likewise for futures. Also, per WebAssembly/component-model#395 (comment), the plan is to move towards a shared table for all resource types as well, so this moves us in that direction. Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix wave breakage due to new stream/future/error-context types Signed-off-by: Joel Dice <joel.dice@fermyon.com> switch wasm-tools to v1.220.0-based branch Signed-off-by: Joel Dice <joel.dice@fermyon.com> check `task.return` type at runtime We can't statically verify a given call to `task.return` corresponds to the expected core signature appropriate for the currently running task, so we must do so at runtime. In order to make that check efficient, we intern the types. My initial plan was to use `ModuleInternedTypeIndex` and/or `VMSharedTypeIndex` for interning, but that got hairy with WasmGC considerations, so instead I added new fields to `ComponentTypes` and `ComponentTypesBuilder`. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add `TypedFunc::call_concurrent` and refine stream/future APIs This implements what I proposed in https://github.com/dicej/rfcs/blob/component-async/accepted/component-model-async.md#wasmtime. Specifically, it adds: - A new `Promise` type, useful for working with concurrent operations that require access to a `Store` to make progress. - A new `PromisesUnordered` type for `await`ing multiple promises concurrently -`TypedFunc::call_concurrent` (which returns a `Promise`), allowing multiple host->guest calls to run concurrently on the same instance. - Updated `{Stream|Future}{Writer|Reader}` APIs which use `Promise` The upshot is that the embedder can now ergonomically manage arbitrary numbers of concurrent operations. Previously, this was a lot more difficult to do without accidentally starving some of the operations due to another one monopolizing the `Store`. Finally, this includes various refactorings and fixes for bugs exposed by the newer, more versatile APIs. Signed-off-by: Joel Dice <joel.dice@fermyon.com> clean up verbosity in component/func.rs Signed-off-by: Joel Dice <joel.dice@fermyon.com> snapshot Signed-off-by: Joel Dice <joel.dice@fermyon.com> implement stream/future read/write cancellation This required a somewhat viral addition of `Send` and `Sync` bounds for async host function closure types, unfortunately. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add `Func::call_concurrent` and `LinkerInstance::func_new_concurrent` Signed-off-by: Joel Dice <joel.dice@fermyon.com> dynamic API support for streams/futures/error-contexts Signed-off-by: Joel Dice <joel.dice@fermyon.com> support callback-less (AKA stackful) async lifts Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix `call_host` regression Signed-off-by: Joel Dice <joel.dice@fermyon.com> add component model async end-to-end tests I've ported these over from https://github.com/dicej/component-async-demo Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix test regressions and clippy warnings Signed-off-by: Joel Dice <joel.dice@fermyon.com> satisfy clippy Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix async tests when `component-model-async` enabled Enabling this feature for all tests revealed various missing pieces in the new `concurrent.rs` fiber mechanism, which I've addressed. This adds a bunch of ugly `#[cfg(feature = "component-model-async")]` guards, but those will all go away once I unify the two async fiber implementations. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add and modify tests to cover concurrent APIs Primarily, this tests and implements cases where parameters and/or results must be passed via linear memory instead of the stack. Signed-off-by: Joel Dice <joel.dice@fermyon.com> `concurrent_{imports|exports}` component macro codegen tests This enables codegen testing of the `concurrent_imports` and `concurrent_exports` options to `wasmtime::component::bindgen` and also fixes code generation for world-level function and resource exports that use the concurrent call style. Signed-off-by: Joel Dice <joel.dice@fermyon.com> `concurrent_{imports|exports}` component macro expanded tests This enables testing of the `concurrent_imports` and `concurrent_exports` options in `crates/component-macro/tests/expanded.rs`. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add tests/misc_testsuite/component-model-async/*.wast These only test instantiation of components which use various async options and built-ins so far. Next, I'll happy and sad path tests which actually execute code. Signed-off-by: Joel Dice <joel.dice@fermyon.com> appease clippy Signed-off-by: Joel Dice <joel.dice@fermyon.com> add tests/misc_testsuite/component-model-async/fused.wast Signed-off-by: Joel Dice <joel.dice@fermyon.com> add non-panicking bounds checks where appropriate Signed-off-by: Joel Dice <joel.dice@fermyon.com> remove post-return bits from async result lift code ...at least until we've determined whether post-return options even make sense for async-lifted exports. Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix component-model-async/fused.wast test failure Signed-off-by: Joel Dice <joel.dice@fermyon.com> use `enum` types to represent status and event codes Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix component-model-async/fused.wast test failure (2nd try) Signed-off-by: Joel Dice <joel.dice@fermyon.com> use `gc_types = true` in component-model-async/fused.wast We use `Instruction::RefFunc` when generating adapters for async lifts and/or lowers, which Winch doesn't understand, and apparently `gc_types = true` is what tells the test infra not to use Winch. Signed-off-by: Joel Dice <joel.dice@fermyon.com> trap if async function finishes without calling `task.return` Signed-off-by: Joel Dice <joel.dice@fermyon.com> update wit-bindgen and fix rebase damage Signed-off-by: Joel Dice <joel.dice@fermyon.com> call post-return function if any for async->sync fused calls Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix non-component-model-async build; appease clippy Signed-off-by: Joel Dice <joel.dice@fermyon.com> bless bindgen output whitespace changes Signed-off-by: Joel Dice <joel.dice@fermyon.com> enforce resource borrow requirements for async calls Signed-off-by: Joel Dice <joel.dice@fermyon.com> update `wit-bindgen` and simplify `async_borrowing_callee` test Signed-off-by: Joel Dice <joel.dice@fermyon.com> call `InstanceFlags::set_may_enter` where appropriate There's still more work to do to fully implement (and test) the reentrance rules for concurrent tasks, but this is a start. Signed-off-by: Joel Dice <joel.dice@fermyon.com> finish implementing reentrance checks Signed-off-by: Joel Dice <joel.dice@fermyon.com> feat: implement error-context (bytecodealliance#1) * feat: initial error-context implementation This commit implements error-context related functions inside the VM, along with tests to ensure that basic error-context.new and error-context.debug-message functionality works. Signed-off-by: Victor Adossi <vadossi@cosmonic.com> * wip: add test for error context callee/caller transfer Signed-off-by: Victor Adossi <vadossi@cosmonic.com> * wip: test for async context transfer Signed-off-by: Victor Adossi <vadossi@cosmonic.com> --------- Signed-off-by: Victor Adossi <vadossi@cosmonic.com> run cargo fmt Signed-off-by: Joel Dice <joel.dice@fermyon.com> appease clippy Signed-off-by: Joel Dice <joel.dice@fermyon.com> pull in Roman's unit stream work; add world-level export test Signed-off-by: Joel Dice <joel.dice@fermyon.com> add unit stream tests Signed-off-by: Joel Dice <joel.dice@fermyon.com>

This adds support for loading, compiling, linking, and running components which use the [Async ABI](https://github.com/WebAssembly/component-model/blob/main/design/mvp/Async.md) along with the [`stream`, `future`, and `error-context`](WebAssembly/component-model#405) types. It also adds support for generating host bindings such that multiple host functions can be run concurrently with guest tasks -- without monopolizing the `Store`. See the [implementation RFC](bytecodealliance/rfcs#38) for details, as well as [this repo](https://github.com/dicej/component-async-demo) containing end-to-end smoke tests. Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix clippy warnings and bench/fuzzing errors Signed-off-by: Joel Dice <joel.dice@fermyon.com> revert atomic.wit whitespace change Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix build when component-model disabled Signed-off-by: Joel Dice <joel.dice@fermyon.com> bless component-macro expected output Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix no-std build error Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix build with --no-default-features --features runtime,component-model Signed-off-by: Joel Dice <joel.dice@fermyon.com> partly fix no-std build It's still broken due to the use of `std::collections::HashMap` in crates/wasmtime/src/runtime/vm/component.rs. I'll address that as part of the work to avoid exposing global task/future/stream/error-context handles to guests. Signed-off-by: Joel Dice <joel.dice@fermyon.com> maintain per-instance tables for futures, streams, and error-contexts Signed-off-by: Joel Dice <joel.dice@fermyon.com> refactor task/stream/future handle lifting/lowering This addresses a couple of issues: - Previously, we were passing task/stream/future/error-context reps directly to instances while keeping track of which instance had access to which rep. That worked fine in that there was no way to forge access to inaccessible reps, but it leaked information about what other instances were doing. Now we maintain per-instance waitable and error-context tables which map the reps to and from the handles which the instance sees. - The `no_std` build was broken due to use of `HashMap` in `runtime::vm::component`, which is now fixed. Note that we use one single table per instance for all tasks, streams, and futures. This is partly necessary because, when async events are delivered to the guest, it wouldn't have enough context to know which stream or future we're talking about if each unique stream and future type had its own table. So at minimum, we need to use the same table for all streams (regardless of payload type), and likewise for futures. Also, per WebAssembly/component-model#395 (comment), the plan is to move towards a shared table for all resource types as well, so this moves us in that direction. Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix wave breakage due to new stream/future/error-context types Signed-off-by: Joel Dice <joel.dice@fermyon.com> switch wasm-tools to v1.220.0-based branch Signed-off-by: Joel Dice <joel.dice@fermyon.com> check `task.return` type at runtime We can't statically verify a given call to `task.return` corresponds to the expected core signature appropriate for the currently running task, so we must do so at runtime. In order to make that check efficient, we intern the types. My initial plan was to use `ModuleInternedTypeIndex` and/or `VMSharedTypeIndex` for interning, but that got hairy with WasmGC considerations, so instead I added new fields to `ComponentTypes` and `ComponentTypesBuilder`. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add `TypedFunc::call_concurrent` and refine stream/future APIs This implements what I proposed in https://github.com/dicej/rfcs/blob/component-async/accepted/component-model-async.md#wasmtime. Specifically, it adds: - A new `Promise` type, useful for working with concurrent operations that require access to a `Store` to make progress. - A new `PromisesUnordered` type for `await`ing multiple promises concurrently -`TypedFunc::call_concurrent` (which returns a `Promise`), allowing multiple host->guest calls to run concurrently on the same instance. - Updated `{Stream|Future}{Writer|Reader}` APIs which use `Promise` The upshot is that the embedder can now ergonomically manage arbitrary numbers of concurrent operations. Previously, this was a lot more difficult to do without accidentally starving some of the operations due to another one monopolizing the `Store`. Finally, this includes various refactorings and fixes for bugs exposed by the newer, more versatile APIs. Signed-off-by: Joel Dice <joel.dice@fermyon.com> clean up verbosity in component/func.rs Signed-off-by: Joel Dice <joel.dice@fermyon.com> snapshot Signed-off-by: Joel Dice <joel.dice@fermyon.com> implement stream/future read/write cancellation This required a somewhat viral addition of `Send` and `Sync` bounds for async host function closure types, unfortunately. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add `Func::call_concurrent` and `LinkerInstance::func_new_concurrent` Signed-off-by: Joel Dice <joel.dice@fermyon.com> dynamic API support for streams/futures/error-contexts Signed-off-by: Joel Dice <joel.dice@fermyon.com> support callback-less (AKA stackful) async lifts Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix `call_host` regression Signed-off-by: Joel Dice <joel.dice@fermyon.com> add component model async end-to-end tests I've ported these over from https://github.com/dicej/component-async-demo Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix test regressions and clippy warnings Signed-off-by: Joel Dice <joel.dice@fermyon.com> satisfy clippy Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix async tests when `component-model-async` enabled Enabling this feature for all tests revealed various missing pieces in the new `concurrent.rs` fiber mechanism, which I've addressed. This adds a bunch of ugly `#[cfg(feature = "component-model-async")]` guards, but those will all go away once I unify the two async fiber implementations. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add and modify tests to cover concurrent APIs Primarily, this tests and implements cases where parameters and/or results must be passed via linear memory instead of the stack. Signed-off-by: Joel Dice <joel.dice@fermyon.com> `concurrent_{imports|exports}` component macro codegen tests This enables codegen testing of the `concurrent_imports` and `concurrent_exports` options to `wasmtime::component::bindgen` and also fixes code generation for world-level function and resource exports that use the concurrent call style. Signed-off-by: Joel Dice <joel.dice@fermyon.com> `concurrent_{imports|exports}` component macro expanded tests This enables testing of the `concurrent_imports` and `concurrent_exports` options in `crates/component-macro/tests/expanded.rs`. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add tests/misc_testsuite/component-model-async/*.wast These only test instantiation of components which use various async options and built-ins so far. Next, I'll happy and sad path tests which actually execute code. Signed-off-by: Joel Dice <joel.dice@fermyon.com> appease clippy Signed-off-by: Joel Dice <joel.dice@fermyon.com> add tests/misc_testsuite/component-model-async/fused.wast Signed-off-by: Joel Dice <joel.dice@fermyon.com> add non-panicking bounds checks where appropriate Signed-off-by: Joel Dice <joel.dice@fermyon.com> remove post-return bits from async result lift code ...at least until we've determined whether post-return options even make sense for async-lifted exports. Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix component-model-async/fused.wast test failure Signed-off-by: Joel Dice <joel.dice@fermyon.com> use `enum` types to represent status and event codes Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix component-model-async/fused.wast test failure (2nd try) Signed-off-by: Joel Dice <joel.dice@fermyon.com> use `gc_types = true` in component-model-async/fused.wast We use `Instruction::RefFunc` when generating adapters for async lifts and/or lowers, which Winch doesn't understand, and apparently `gc_types = true` is what tells the test infra not to use Winch. Signed-off-by: Joel Dice <joel.dice@fermyon.com> trap if async function finishes without calling `task.return` Signed-off-by: Joel Dice <joel.dice@fermyon.com> update wit-bindgen and fix rebase damage Signed-off-by: Joel Dice <joel.dice@fermyon.com> call post-return function if any for async->sync fused calls Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix non-component-model-async build; appease clippy Signed-off-by: Joel Dice <joel.dice@fermyon.com> bless bindgen output whitespace changes Signed-off-by: Joel Dice <joel.dice@fermyon.com> enforce resource borrow requirements for async calls Signed-off-by: Joel Dice <joel.dice@fermyon.com> update `wit-bindgen` and simplify `async_borrowing_callee` test Signed-off-by: Joel Dice <joel.dice@fermyon.com> call `InstanceFlags::set_may_enter` where appropriate There's still more work to do to fully implement (and test) the reentrance rules for concurrent tasks, but this is a start. Signed-off-by: Joel Dice <joel.dice@fermyon.com> finish implementing reentrance checks Signed-off-by: Joel Dice <joel.dice@fermyon.com> feat: implement error-context (#1) * feat: initial error-context implementation This commit implements error-context related functions inside the VM, along with tests to ensure that basic error-context.new and error-context.debug-message functionality works. Signed-off-by: Victor Adossi <vadossi@cosmonic.com> * wip: add test for error context callee/caller transfer Signed-off-by: Victor Adossi <vadossi@cosmonic.com> * wip: test for async context transfer Signed-off-by: Victor Adossi <vadossi@cosmonic.com> --------- Signed-off-by: Victor Adossi <vadossi@cosmonic.com> run cargo fmt Signed-off-by: Joel Dice <joel.dice@fermyon.com> appease clippy Signed-off-by: Joel Dice <joel.dice@fermyon.com> pull in Roman's unit stream work; add world-level export test Signed-off-by: Joel Dice <joel.dice@fermyon.com> add unit stream tests Signed-off-by: Joel Dice <joel.dice@fermyon.com>

This adds support for loading, compiling, linking, and running components which use the [Async ABI](https://github.com/WebAssembly/component-model/blob/main/design/mvp/Async.md) along with the [`stream`, `future`, and `error-context`](WebAssembly/component-model#405) types. It also adds support for generating host bindings such that multiple host functions can be run concurrently with guest tasks -- without monopolizing the `Store`. See the [implementation RFC](bytecodealliance/rfcs#38) for details, as well as [this repo](https://github.com/dicej/component-async-demo) containing end-to-end smoke tests. Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix clippy warnings and bench/fuzzing errors Signed-off-by: Joel Dice <joel.dice@fermyon.com> revert atomic.wit whitespace change Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix build when component-model disabled Signed-off-by: Joel Dice <joel.dice@fermyon.com> bless component-macro expected output Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix no-std build error Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix build with --no-default-features --features runtime,component-model Signed-off-by: Joel Dice <joel.dice@fermyon.com> partly fix no-std build It's still broken due to the use of `std::collections::HashMap` in crates/wasmtime/src/runtime/vm/component.rs. I'll address that as part of the work to avoid exposing global task/future/stream/error-context handles to guests. Signed-off-by: Joel Dice <joel.dice@fermyon.com> maintain per-instance tables for futures, streams, and error-contexts Signed-off-by: Joel Dice <joel.dice@fermyon.com> refactor task/stream/future handle lifting/lowering This addresses a couple of issues: - Previously, we were passing task/stream/future/error-context reps directly to instances while keeping track of which instance had access to which rep. That worked fine in that there was no way to forge access to inaccessible reps, but it leaked information about what other instances were doing. Now we maintain per-instance waitable and error-context tables which map the reps to and from the handles which the instance sees. - The `no_std` build was broken due to use of `HashMap` in `runtime::vm::component`, which is now fixed. Note that we use one single table per instance for all tasks, streams, and futures. This is partly necessary because, when async events are delivered to the guest, it wouldn't have enough context to know which stream or future we're talking about if each unique stream and future type had its own table. So at minimum, we need to use the same table for all streams (regardless of payload type), and likewise for futures. Also, per WebAssembly/component-model#395 (comment), the plan is to move towards a shared table for all resource types as well, so this moves us in that direction. Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix wave breakage due to new stream/future/error-context types Signed-off-by: Joel Dice <joel.dice@fermyon.com> switch wasm-tools to v1.220.0-based branch Signed-off-by: Joel Dice <joel.dice@fermyon.com> check `task.return` type at runtime We can't statically verify a given call to `task.return` corresponds to the expected core signature appropriate for the currently running task, so we must do so at runtime. In order to make that check efficient, we intern the types. My initial plan was to use `ModuleInternedTypeIndex` and/or `VMSharedTypeIndex` for interning, but that got hairy with WasmGC considerations, so instead I added new fields to `ComponentTypes` and `ComponentTypesBuilder`. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add `TypedFunc::call_concurrent` and refine stream/future APIs This implements what I proposed in https://github.com/dicej/rfcs/blob/component-async/accepted/component-model-async.md#wasmtime. Specifically, it adds: - A new `Promise` type, useful for working with concurrent operations that require access to a `Store` to make progress. - A new `PromisesUnordered` type for `await`ing multiple promises concurrently -`TypedFunc::call_concurrent` (which returns a `Promise`), allowing multiple host->guest calls to run concurrently on the same instance. - Updated `{Stream|Future}{Writer|Reader}` APIs which use `Promise` The upshot is that the embedder can now ergonomically manage arbitrary numbers of concurrent operations. Previously, this was a lot more difficult to do without accidentally starving some of the operations due to another one monopolizing the `Store`. Finally, this includes various refactorings and fixes for bugs exposed by the newer, more versatile APIs. Signed-off-by: Joel Dice <joel.dice@fermyon.com> clean up verbosity in component/func.rs Signed-off-by: Joel Dice <joel.dice@fermyon.com> snapshot Signed-off-by: Joel Dice <joel.dice@fermyon.com> implement stream/future read/write cancellation This required a somewhat viral addition of `Send` and `Sync` bounds for async host function closure types, unfortunately. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add `Func::call_concurrent` and `LinkerInstance::func_new_concurrent` Signed-off-by: Joel Dice <joel.dice@fermyon.com> dynamic API support for streams/futures/error-contexts Signed-off-by: Joel Dice <joel.dice@fermyon.com> support callback-less (AKA stackful) async lifts Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix `call_host` regression Signed-off-by: Joel Dice <joel.dice@fermyon.com> add component model async end-to-end tests I've ported these over from https://github.com/dicej/component-async-demo Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix test regressions and clippy warnings Signed-off-by: Joel Dice <joel.dice@fermyon.com> satisfy clippy Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix async tests when `component-model-async` enabled Enabling this feature for all tests revealed various missing pieces in the new `concurrent.rs` fiber mechanism, which I've addressed. This adds a bunch of ugly `#[cfg(feature = "component-model-async")]` guards, but those will all go away once I unify the two async fiber implementations. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add and modify tests to cover concurrent APIs Primarily, this tests and implements cases where parameters and/or results must be passed via linear memory instead of the stack. Signed-off-by: Joel Dice <joel.dice@fermyon.com> `concurrent_{imports|exports}` component macro codegen tests This enables codegen testing of the `concurrent_imports` and `concurrent_exports` options to `wasmtime::component::bindgen` and also fixes code generation for world-level function and resource exports that use the concurrent call style. Signed-off-by: Joel Dice <joel.dice@fermyon.com> `concurrent_{imports|exports}` component macro expanded tests This enables testing of the `concurrent_imports` and `concurrent_exports` options in `crates/component-macro/tests/expanded.rs`. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add tests/misc_testsuite/component-model-async/*.wast These only test instantiation of components which use various async options and built-ins so far. Next, I'll happy and sad path tests which actually execute code. Signed-off-by: Joel Dice <joel.dice@fermyon.com> appease clippy Signed-off-by: Joel Dice <joel.dice@fermyon.com> add tests/misc_testsuite/component-model-async/fused.wast Signed-off-by: Joel Dice <joel.dice@fermyon.com> add non-panicking bounds checks where appropriate Signed-off-by: Joel Dice <joel.dice@fermyon.com> remove post-return bits from async result lift code ...at least until we've determined whether post-return options even make sense for async-lifted exports. Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix component-model-async/fused.wast test failure Signed-off-by: Joel Dice <joel.dice@fermyon.com> use `enum` types to represent status and event codes Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix component-model-async/fused.wast test failure (2nd try) Signed-off-by: Joel Dice <joel.dice@fermyon.com> use `gc_types = true` in component-model-async/fused.wast We use `Instruction::RefFunc` when generating adapters for async lifts and/or lowers, which Winch doesn't understand, and apparently `gc_types = true` is what tells the test infra not to use Winch. Signed-off-by: Joel Dice <joel.dice@fermyon.com> trap if async function finishes without calling `task.return` Signed-off-by: Joel Dice <joel.dice@fermyon.com> update wit-bindgen and fix rebase damage Signed-off-by: Joel Dice <joel.dice@fermyon.com> call post-return function if any for async->sync fused calls Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix non-component-model-async build; appease clippy Signed-off-by: Joel Dice <joel.dice@fermyon.com> bless bindgen output whitespace changes Signed-off-by: Joel Dice <joel.dice@fermyon.com> enforce resource borrow requirements for async calls Signed-off-by: Joel Dice <joel.dice@fermyon.com> update `wit-bindgen` and simplify `async_borrowing_callee` test Signed-off-by: Joel Dice <joel.dice@fermyon.com> call `InstanceFlags::set_may_enter` where appropriate There's still more work to do to fully implement (and test) the reentrance rules for concurrent tasks, but this is a start. Signed-off-by: Joel Dice <joel.dice@fermyon.com> finish implementing reentrance checks Signed-off-by: Joel Dice <joel.dice@fermyon.com> feat: implement error-context (#1) * feat: initial error-context implementation This commit implements error-context related functions inside the VM, along with tests to ensure that basic error-context.new and error-context.debug-message functionality works. Signed-off-by: Victor Adossi <vadossi@cosmonic.com> * wip: add test for error context callee/caller transfer Signed-off-by: Victor Adossi <vadossi@cosmonic.com> * wip: test for async context transfer Signed-off-by: Victor Adossi <vadossi@cosmonic.com> --------- Signed-off-by: Victor Adossi <vadossi@cosmonic.com> run cargo fmt Signed-off-by: Joel Dice <joel.dice@fermyon.com> appease clippy Signed-off-by: Joel Dice <joel.dice@fermyon.com> pull in Roman's unit stream work; add world-level export test Signed-off-by: Joel Dice <joel.dice@fermyon.com> add unit stream tests Signed-off-by: Joel Dice <joel.dice@fermyon.com> CI fixes Signed-off-by: Joel Dice <joel.dice@fermyon.com>

This is another piece of bytecodealliance#9582 which I'm splitting out to make review easier. This test exercises fused adapter generation for various flavors of intercomponent async->async, async->sync, and sync->async calls. The remaining changes fill in some TODOs to make the test pass. Signed-off-by: Joel Dice <joel.dice@fermyon.com> address review feedback Signed-off-by: Joel Dice <joel.dice@fermyon.com> update `task.return` to match spec This temporarily switches to my fork of `wasm-tools` until bytecodealliance/wasm-tools#1989 is merged. Signed-off-by: Joel Dice <joel.dice@fermyon.com> refactor `component-model-async` cfg attrs per review feedback Also, switch to upstream `wasm-tools` main branch. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add `Compiler::new` constructor Signed-off-by: Joel Dice <joel.dice@fermyon.com> add comments covering various lower/lift combos in FACT generator Signed-off-by: Joel Dice <joel.dice@fermyon.com> add `Compiler::global_set` helper function Signed-off-by: Joel Dice <joel.dice@fermyon.com> add component-model-async/task-builtins.wast test This is another piece of bytecodealliance#9582 which I'm splitting out to make review easier. This test includes components which use the `task.backpressure`, `task.return`, `task.wait`, `task.poll`, `task.yield`, and `subtask.drop` builtins. The rest of the changes fill in some TODOs to make the test pass. Signed-off-by: Joel Dice <joel.dice@fermyon.com> Add support for async/streams/futures This adds support for loading, compiling, linking, and running components which use the [Async ABI](https://github.com/WebAssembly/component-model/blob/main/design/mvp/Async.md) along with the [`stream`, `future`, and `error-context`](WebAssembly/component-model#405) types. It also adds support for generating host bindings such that multiple host functions can be run concurrently with guest tasks -- without monopolizing the `Store`. See the [implementation RFC](bytecodealliance/rfcs#38) for details, as well as [this repo](https://github.com/dicej/component-async-demo) containing end-to-end smoke tests. Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix clippy warnings and bench/fuzzing errors Signed-off-by: Joel Dice <joel.dice@fermyon.com> revert atomic.wit whitespace change Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix build when component-model disabled Signed-off-by: Joel Dice <joel.dice@fermyon.com> bless component-macro expected output Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix no-std build error Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix build with --no-default-features --features runtime,component-model Signed-off-by: Joel Dice <joel.dice@fermyon.com> partly fix no-std build It's still broken due to the use of `std::collections::HashMap` in crates/wasmtime/src/runtime/vm/component.rs. I'll address that as part of the work to avoid exposing global task/future/stream/error-context handles to guests. Signed-off-by: Joel Dice <joel.dice@fermyon.com> maintain per-instance tables for futures, streams, and error-contexts Signed-off-by: Joel Dice <joel.dice@fermyon.com> refactor task/stream/future handle lifting/lowering This addresses a couple of issues: - Previously, we were passing task/stream/future/error-context reps directly to instances while keeping track of which instance had access to which rep. That worked fine in that there was no way to forge access to inaccessible reps, but it leaked information about what other instances were doing. Now we maintain per-instance waitable and error-context tables which map the reps to and from the handles which the instance sees. - The `no_std` build was broken due to use of `HashMap` in `runtime::vm::component`, which is now fixed. Note that we use one single table per instance for all tasks, streams, and futures. This is partly necessary because, when async events are delivered to the guest, it wouldn't have enough context to know which stream or future we're talking about if each unique stream and future type had its own table. So at minimum, we need to use the same table for all streams (regardless of payload type), and likewise for futures. Also, per WebAssembly/component-model#395 (comment), the plan is to move towards a shared table for all resource types as well, so this moves us in that direction. Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix wave breakage due to new stream/future/error-context types Signed-off-by: Joel Dice <joel.dice@fermyon.com> switch wasm-tools to v1.220.0-based branch Signed-off-by: Joel Dice <joel.dice@fermyon.com> check `task.return` type at runtime We can't statically verify a given call to `task.return` corresponds to the expected core signature appropriate for the currently running task, so we must do so at runtime. In order to make that check efficient, we intern the types. My initial plan was to use `ModuleInternedTypeIndex` and/or `VMSharedTypeIndex` for interning, but that got hairy with WasmGC considerations, so instead I added new fields to `ComponentTypes` and `ComponentTypesBuilder`. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add `TypedFunc::call_concurrent` and refine stream/future APIs This implements what I proposed in https://github.com/dicej/rfcs/blob/component-async/accepted/component-model-async.md#wasmtime. Specifically, it adds: - A new `Promise` type, useful for working with concurrent operations that require access to a `Store` to make progress. - A new `PromisesUnordered` type for `await`ing multiple promises concurrently -`TypedFunc::call_concurrent` (which returns a `Promise`), allowing multiple host->guest calls to run concurrently on the same instance. - Updated `{Stream|Future}{Writer|Reader}` APIs which use `Promise` The upshot is that the embedder can now ergonomically manage arbitrary numbers of concurrent operations. Previously, this was a lot more difficult to do without accidentally starving some of the operations due to another one monopolizing the `Store`. Finally, this includes various refactorings and fixes for bugs exposed by the newer, more versatile APIs. Signed-off-by: Joel Dice <joel.dice@fermyon.com> clean up verbosity in component/func.rs Signed-off-by: Joel Dice <joel.dice@fermyon.com> snapshot Signed-off-by: Joel Dice <joel.dice@fermyon.com> implement stream/future read/write cancellation This required a somewhat viral addition of `Send` and `Sync` bounds for async host function closure types, unfortunately. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add `Func::call_concurrent` and `LinkerInstance::func_new_concurrent` Signed-off-by: Joel Dice <joel.dice@fermyon.com> dynamic API support for streams/futures/error-contexts Signed-off-by: Joel Dice <joel.dice@fermyon.com> support callback-less (AKA stackful) async lifts Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix `call_host` regression Signed-off-by: Joel Dice <joel.dice@fermyon.com> add component model async end-to-end tests I've ported these over from https://github.com/dicej/component-async-demo Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix test regressions and clippy warnings Signed-off-by: Joel Dice <joel.dice@fermyon.com> satisfy clippy Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix async tests when `component-model-async` enabled Enabling this feature for all tests revealed various missing pieces in the new `concurrent.rs` fiber mechanism, which I've addressed. This adds a bunch of ugly `#[cfg(feature = "component-model-async")]` guards, but those will all go away once I unify the two async fiber implementations. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add and modify tests to cover concurrent APIs Primarily, this tests and implements cases where parameters and/or results must be passed via linear memory instead of the stack. Signed-off-by: Joel Dice <joel.dice@fermyon.com> `concurrent_{imports|exports}` component macro codegen tests This enables codegen testing of the `concurrent_imports` and `concurrent_exports` options to `wasmtime::component::bindgen` and also fixes code generation for world-level function and resource exports that use the concurrent call style. Signed-off-by: Joel Dice <joel.dice@fermyon.com> `concurrent_{imports|exports}` component macro expanded tests This enables testing of the `concurrent_imports` and `concurrent_exports` options in `crates/component-macro/tests/expanded.rs`. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add tests/misc_testsuite/component-model-async/*.wast These only test instantiation of components which use various async options and built-ins so far. Next, I'll happy and sad path tests which actually execute code. Signed-off-by: Joel Dice <joel.dice@fermyon.com> appease clippy Signed-off-by: Joel Dice <joel.dice@fermyon.com> add tests/misc_testsuite/component-model-async/fused.wast Signed-off-by: Joel Dice <joel.dice@fermyon.com> add non-panicking bounds checks where appropriate Signed-off-by: Joel Dice <joel.dice@fermyon.com> remove post-return bits from async result lift code ...at least until we've determined whether post-return options even make sense for async-lifted exports. Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix component-model-async/fused.wast test failure Signed-off-by: Joel Dice <joel.dice@fermyon.com> use `enum` types to represent status and event codes Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix component-model-async/fused.wast test failure (2nd try) Signed-off-by: Joel Dice <joel.dice@fermyon.com> use `gc_types = true` in component-model-async/fused.wast We use `Instruction::RefFunc` when generating adapters for async lifts and/or lowers, which Winch doesn't understand, and apparently `gc_types = true` is what tells the test infra not to use Winch. Signed-off-by: Joel Dice <joel.dice@fermyon.com> trap if async function finishes without calling `task.return` Signed-off-by: Joel Dice <joel.dice@fermyon.com> update wit-bindgen and fix rebase damage Signed-off-by: Joel Dice <joel.dice@fermyon.com> call post-return function if any for async->sync fused calls Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix non-component-model-async build; appease clippy Signed-off-by: Joel Dice <joel.dice@fermyon.com> bless bindgen output whitespace changes Signed-off-by: Joel Dice <joel.dice@fermyon.com> enforce resource borrow requirements for async calls Signed-off-by: Joel Dice <joel.dice@fermyon.com> update `wit-bindgen` and simplify `async_borrowing_callee` test Signed-off-by: Joel Dice <joel.dice@fermyon.com> call `InstanceFlags::set_may_enter` where appropriate There's still more work to do to fully implement (and test) the reentrance rules for concurrent tasks, but this is a start. Signed-off-by: Joel Dice <joel.dice@fermyon.com> finish implementing reentrance checks Signed-off-by: Joel Dice <joel.dice@fermyon.com> feat: implement error-context (#1) * feat: initial error-context implementation This commit implements error-context related functions inside the VM, along with tests to ensure that basic error-context.new and error-context.debug-message functionality works. Signed-off-by: Victor Adossi <vadossi@cosmonic.com> * wip: add test for error context callee/caller transfer Signed-off-by: Victor Adossi <vadossi@cosmonic.com> * wip: test for async context transfer Signed-off-by: Victor Adossi <vadossi@cosmonic.com> --------- Signed-off-by: Victor Adossi <vadossi@cosmonic.com> run cargo fmt Signed-off-by: Joel Dice <joel.dice@fermyon.com> appease clippy Signed-off-by: Joel Dice <joel.dice@fermyon.com> pull in Roman's unit stream work; add world-level export test Signed-off-by: Joel Dice <joel.dice@fermyon.com> add unit stream tests Signed-off-by: Joel Dice <joel.dice@fermyon.com> CI fixes Signed-off-by: Joel Dice <joel.dice@fermyon.com>

This adds support for loading, compiling, linking, and running components which use the [Async ABI](https://github.com/WebAssembly/component-model/blob/main/design/mvp/Async.md) along with the [`stream`, `future`, and `error-context`](WebAssembly/component-model#405) types. It also adds support for generating host bindings such that multiple host functions can be run concurrently with guest tasks -- without monopolizing the `Store`. See the [implementation RFC](bytecodealliance/rfcs#38) for details, as well as [this repo](https://github.com/dicej/component-async-demo) containing end-to-end smoke tests. Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix clippy warnings and bench/fuzzing errors Signed-off-by: Joel Dice <joel.dice@fermyon.com> revert atomic.wit whitespace change Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix build when component-model disabled Signed-off-by: Joel Dice <joel.dice@fermyon.com> bless component-macro expected output Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix no-std build error Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix build with --no-default-features --features runtime,component-model Signed-off-by: Joel Dice <joel.dice@fermyon.com> partly fix no-std build It's still broken due to the use of `std::collections::HashMap` in crates/wasmtime/src/runtime/vm/component.rs. I'll address that as part of the work to avoid exposing global task/future/stream/error-context handles to guests. Signed-off-by: Joel Dice <joel.dice@fermyon.com> maintain per-instance tables for futures, streams, and error-contexts Signed-off-by: Joel Dice <joel.dice@fermyon.com> refactor task/stream/future handle lifting/lowering This addresses a couple of issues: - Previously, we were passing task/stream/future/error-context reps directly to instances while keeping track of which instance had access to which rep. That worked fine in that there was no way to forge access to inaccessible reps, but it leaked information about what other instances were doing. Now we maintain per-instance waitable and error-context tables which map the reps to and from the handles which the instance sees. - The `no_std` build was broken due to use of `HashMap` in `runtime::vm::component`, which is now fixed. Note that we use one single table per instance for all tasks, streams, and futures. This is partly necessary because, when async events are delivered to the guest, it wouldn't have enough context to know which stream or future we're talking about if each unique stream and future type had its own table. So at minimum, we need to use the same table for all streams (regardless of payload type), and likewise for futures. Also, per WebAssembly/component-model#395 (comment), the plan is to move towards a shared table for all resource types as well, so this moves us in that direction. Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix wave breakage due to new stream/future/error-context types Signed-off-by: Joel Dice <joel.dice@fermyon.com> switch wasm-tools to v1.220.0-based branch Signed-off-by: Joel Dice <joel.dice@fermyon.com> check `task.return` type at runtime We can't statically verify a given call to `task.return` corresponds to the expected core signature appropriate for the currently running task, so we must do so at runtime. In order to make that check efficient, we intern the types. My initial plan was to use `ModuleInternedTypeIndex` and/or `VMSharedTypeIndex` for interning, but that got hairy with WasmGC considerations, so instead I added new fields to `ComponentTypes` and `ComponentTypesBuilder`. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add `TypedFunc::call_concurrent` and refine stream/future APIs This implements what I proposed in https://github.com/dicej/rfcs/blob/component-async/accepted/component-model-async.md#wasmtime. Specifically, it adds: - A new `Promise` type, useful for working with concurrent operations that require access to a `Store` to make progress. - A new `PromisesUnordered` type for `await`ing multiple promises concurrently -`TypedFunc::call_concurrent` (which returns a `Promise`), allowing multiple host->guest calls to run concurrently on the same instance. - Updated `{Stream|Future}{Writer|Reader}` APIs which use `Promise` The upshot is that the embedder can now ergonomically manage arbitrary numbers of concurrent operations. Previously, this was a lot more difficult to do without accidentally starving some of the operations due to another one monopolizing the `Store`. Finally, this includes various refactorings and fixes for bugs exposed by the newer, more versatile APIs. Signed-off-by: Joel Dice <joel.dice@fermyon.com> clean up verbosity in component/func.rs Signed-off-by: Joel Dice <joel.dice@fermyon.com> snapshot Signed-off-by: Joel Dice <joel.dice@fermyon.com> implement stream/future read/write cancellation This required a somewhat viral addition of `Send` and `Sync` bounds for async host function closure types, unfortunately. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add `Func::call_concurrent` and `LinkerInstance::func_new_concurrent` Signed-off-by: Joel Dice <joel.dice@fermyon.com> dynamic API support for streams/futures/error-contexts Signed-off-by: Joel Dice <joel.dice@fermyon.com> support callback-less (AKA stackful) async lifts Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix `call_host` regression Signed-off-by: Joel Dice <joel.dice@fermyon.com> add component model async end-to-end tests I've ported these over from https://github.com/dicej/component-async-demo Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix test regressions and clippy warnings Signed-off-by: Joel Dice <joel.dice@fermyon.com> satisfy clippy Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix async tests when `component-model-async` enabled Enabling this feature for all tests revealed various missing pieces in the new `concurrent.rs` fiber mechanism, which I've addressed. This adds a bunch of ugly `#[cfg(feature = "component-model-async")]` guards, but those will all go away once I unify the two async fiber implementations. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add and modify tests to cover concurrent APIs Primarily, this tests and implements cases where parameters and/or results must be passed via linear memory instead of the stack. Signed-off-by: Joel Dice <joel.dice@fermyon.com> `concurrent_{imports|exports}` component macro codegen tests This enables codegen testing of the `concurrent_imports` and `concurrent_exports` options to `wasmtime::component::bindgen` and also fixes code generation for world-level function and resource exports that use the concurrent call style. Signed-off-by: Joel Dice <joel.dice@fermyon.com> `concurrent_{imports|exports}` component macro expanded tests This enables testing of the `concurrent_imports` and `concurrent_exports` options in `crates/component-macro/tests/expanded.rs`. Signed-off-by: Joel Dice <joel.dice@fermyon.com> add tests/misc_testsuite/component-model-async/*.wast These only test instantiation of components which use various async options and built-ins so far. Next, I'll happy and sad path tests which actually execute code. Signed-off-by: Joel Dice <joel.dice@fermyon.com> appease clippy Signed-off-by: Joel Dice <joel.dice@fermyon.com> add tests/misc_testsuite/component-model-async/fused.wast Signed-off-by: Joel Dice <joel.dice@fermyon.com> add non-panicking bounds checks where appropriate Signed-off-by: Joel Dice <joel.dice@fermyon.com> remove post-return bits from async result lift code ...at least until we've determined whether post-return options even make sense for async-lifted exports. Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix component-model-async/fused.wast test failure Signed-off-by: Joel Dice <joel.dice@fermyon.com> use `enum` types to represent status and event codes Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix component-model-async/fused.wast test failure (2nd try) Signed-off-by: Joel Dice <joel.dice@fermyon.com> use `gc_types = true` in component-model-async/fused.wast We use `Instruction::RefFunc` when generating adapters for async lifts and/or lowers, which Winch doesn't understand, and apparently `gc_types = true` is what tells the test infra not to use Winch. Signed-off-by: Joel Dice <joel.dice@fermyon.com> trap if async function finishes without calling `task.return` Signed-off-by: Joel Dice <joel.dice@fermyon.com> update wit-bindgen and fix rebase damage Signed-off-by: Joel Dice <joel.dice@fermyon.com> call post-return function if any for async->sync fused calls Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix non-component-model-async build; appease clippy Signed-off-by: Joel Dice <joel.dice@fermyon.com> bless bindgen output whitespace changes Signed-off-by: Joel Dice <joel.dice@fermyon.com> enforce resource borrow requirements for async calls Signed-off-by: Joel Dice <joel.dice@fermyon.com> update `wit-bindgen` and simplify `async_borrowing_callee` test Signed-off-by: Joel Dice <joel.dice@fermyon.com> call `InstanceFlags::set_may_enter` where appropriate There's still more work to do to fully implement (and test) the reentrance rules for concurrent tasks, but this is a start. Signed-off-by: Joel Dice <joel.dice@fermyon.com> finish implementing reentrance checks Signed-off-by: Joel Dice <joel.dice@fermyon.com> feat: implement error-context (#1) * feat: initial error-context implementation This commit implements error-context related functions inside the VM, along with tests to ensure that basic error-context.new and error-context.debug-message functionality works. Signed-off-by: Victor Adossi <vadossi@cosmonic.com> * wip: add test for error context callee/caller transfer Signed-off-by: Victor Adossi <vadossi@cosmonic.com> * wip: test for async context transfer Signed-off-by: Victor Adossi <vadossi@cosmonic.com> --------- Signed-off-by: Victor Adossi <vadossi@cosmonic.com> run cargo fmt Signed-off-by: Joel Dice <joel.dice@fermyon.com> appease clippy Signed-off-by: Joel Dice <joel.dice@fermyon.com> pull in Roman's unit stream work; add world-level export test Signed-off-by: Joel Dice <joel.dice@fermyon.com> add unit stream tests Signed-off-by: Joel Dice <joel.dice@fermyon.com> CI fixes Signed-off-by: Joel Dice <joel.dice@fermyon.com> fix non-component-model-async build Signed-off-by: Joel Dice <joel.dice@fermyon.com> add round-trip tests with many parameters and results This adds tests to cover round-tripping values whose flattened form exceed `MAX_FLAT_PARAMS`. Although we already had tests to cover this in tests/all/component_model/func.rs, those tests did not involve any flavor of composition; these do. Signed-off-by: Joel Dice <joel.dice@fermyon.com> test: add multiple send as initial context stream test Signed-off-by: Victor Adossi <vadossi@cosmonic.com> fix Victor's test case Turns out this was the first test case where the host calls a component via an async-lifted export, which in turn calls another component's async-lifted export via a sync-lowered import, which didn't work. Now it does! Signed-off-by: Joel Dice <joel.dice@fermyon.com> refactor sync->async component call adapters We no longer use global variables to stash parameters and results due to the hazard of concurrent calls clobbering them. Instead, we now stash them in the `GuestTask` object for the task. Signed-off-by: Joel Dice <joel.dice@fermyon.com>

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dicej mentioned this pull request Nov 5, 2024
Add support for async ABI, futures, streams, and errors bytecodealliance/wasm-tools#1895
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This was referenced Nov 6, 2024
Add support for async/streams/futures to Rust generator bytecodealliance/wit-bindgen#1081
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Add support for async/streams/futures to Rust generator bytecodealliance/wit-bindgen#1082
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dicej mentioned this pull request Nov 7, 2024
Add support for async/streams/futures bytecodealliance/wasmtime#9582
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lukewagnerand others added 8 commits November 7, 2024 17:10

Add 'stream' and 'future' types
7d1034a

Grammar fix
e8198f7
Co-authored-by: Joel Dice <joel.dice@fermyon.com>

Spelling fix
e6469e8
Co-authored-by: Joel Dice <joel.dice@fermyon.com>

Clarify wording in Async.md concerning the writable end
15298d5

Mention the callback option alongside task.wait
fa3cd3a

Add <typeidx> to {stream,future}.{read,write}
a864991

Handle the concurrently-closed case in {stream,future}.cancel-{read,w…
0b5247f
…rite}

Add note on spec-internal state vs. implementation
b20409a

lukewagner mentioned this pull request Jan 13, 2025
Consider adding an error type #389
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cpetig mentioned this pull request Feb 9, 2025
Discrepancy in binary representation of future and error-context bytecodealliance/wasm-tools#2044
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