Changes in hello.rs

9ce3ffe1 - Update some CI dependencies (#7983)

Thu, 22 Feb 2024 23:54:03 +0000

Update some CI dependencies (#7983)* Update some CI dependencies* Update to the latest nightly toolchain* Update mdbook* Update QEMU for cross-compiled testing* Update `cargo nextest` for usage with MIRIprtest:full* Remove lots of unnecessary imports* Downgrade qemu as 8.2.1 seems to segfault* Remove more imports* Remove unused winch trait method* Fix warnings about unused trait methods* More unused imports* More unused imports List of files: /wasmtime-44.0.1/examples/hello.rs

b0939f66 - Remove explicit `S` type parameters (#5275)

Wed, 16 Nov 2022 05:04:26 +0000

Remove explicit `S` type parameters (#5275)* Remove explicit `S` type parameters This commit removes the explicit `S` type parameter on `Func::typed` and `Instance::get_typed_func`. Historical versions of Rust required that this be a type parameter but recent rustcs support a mixture of explicit type parameters and `impl Trait`. This removes, at callsites, a superfluous `, _` argument which otherwise never needs specification. * Fix mdbook examples List of files: /wasmtime-44.0.1/examples/hello.rs

7a1b7cdf - Implement RFC 11: Redesigning Wasmtime's APIs (#2897)

Thu, 03 Jun 2021 14:10:53 +0000

Implement RFC 11: Redesigning Wasmtime's APIs (#2897)Implement Wasmtime's new API as designed by RFC 11. This is quite a large commit which has had lots of discussion externally, so for more information it's best to read the RFC thread and the PR thread. List of files: /wasmtime-44.0.1/examples/hello.rs

2697a18d - Redo the statically typed `Func` API (#2719)

Thu, 11 Mar 2021 20:43:34 +0000

Redo the statically typed `Func` API (#2719)* Redo the statically typed `Func` API This commit reimplements the `Func` API with respect to statically typed dispatch. Previously `Func` had a `getN` and `getN_async` family of methods which were implemented for 0 to 16 parameters. The return value of these functions was an `impl Fn(..)` closure with the appropriate parameters and return values. There are a number of downsides with this approach that have become apparent over time: * The addition of `*_async` doubled the API surface area (which is quite large here due to one-method-per-number-of-parameters). * The [documentation of `Func`][old-docs] are quite verbose and feel "polluted" with all these getters, making it harder to understand the other methods that can be used to interact with a `Func`. * These methods unconditionally pay the cost of returning an owned `impl Fn` with a `'static` lifetime. While cheap, this is still paying the cost for cloning the `Store` effectively and moving data into the closed-over environment. * Storage of the return value into a struct, for example, always requires `Box`-ing the returned closure since it otherwise cannot be named. * Recently I had the desire to implement an "unchecked" path for invoking wasm where you unsafely assert the type signature of a wasm function. Doing this with today's scheme would require doubling (again) the API surface area for both async and synchronous calls, further polluting the documentation. The main benefit of the previous scheme is that by returning a `impl Fn` it was quite easy and ergonomic to actually invoke the function. In practice, though, examples would often have something akin to `.get0::<()>()?()?` which is a lot of things to interpret all at once. Note that `get0` means "0 parameters" yet a type parameter is passed. There's also a double function invocation which looks like a lot of characters all lined up in a row. Overall, I think that the previous design is starting to show too many cracks and deserves a rewrite. This commit is that rewrite. The new design in this commit is to delete the `getN{,_async}` family of functions and instead have a new API: impl Func { fn typed(&self) -> Result<&Typed>; } impl Typed { fn call(&self, params: P) -> Result; async fn call_async(&self, params: P) -> Result; } This should entirely replace the current scheme, albeit by slightly losing ergonomics use cases. The idea behind the API is that the existence of `Typed` is a "proof" that the underlying function takes `P` and returns `R`. The `Func::typed` method peforms a runtime type-check to ensure that types all match up, and if successful you get a `Typed` value. Otherwise an error is returned. Once you have a `Typed` then, like `Func`, you can either `call` or `call_async`. The difference with a `Typed`, however, is that the params/results are statically known and hence these calls can be much more efficient. This is a much smaller API surface area from before and should greatly simplify the `Func` documentation. There's still a problem where `Func::wrapN_async` produces a lot of functions to document, but that's now the sole offender. It's a nice benefit that the statically-typed-async verisons are now expressed with an `async` function rather than a function-returning-a-future which makes it both more efficient and easier to understand. The type `P` and `R` are intended to either be bare types (e.g. `i32`) or tuples of any length (including 0). At this time `R` is only allowed to be `()` or a bare `i32`-style type because multi-value is not supported with a native ABI (yet). The `P`, however, can be any size of tuples of parameters. This is also where some ergonomics are lost because instead of `f(1, 2)` you now have to write `f.call((1, 2))` (note the double-parens). Similarly `f()` becomes `f.call(())`. Overall I feel that this is a better tradeoff than before. While not universally better due to the loss in ergonomics I feel that this design is much more flexible in terms of what you can do with the return value and also understanding the API surface area (just less to take in). [old-docs]: https://docs.rs/wasmtime/0.24.0/wasmtime/struct.Func.html#method.get0 * Rename Typed to TypedFunc * Implement multi-value returns through `Func::typed` * Fix examples in docs * Fix some more errors * More test fixes * Rebasing and adding `get_typed_func` * Updating tests * Fix typo * More doc tweaks * Tweak visibility on `Func::invoke` * Fix tests again List of files: /wasmtime-44.0.1/examples/hello.rs

15c68f2c - Disconnects `Store` state fields from `Compiler` (#1761)

Tue, 02 Jun 2020 18:44:39 +0000

Disconnects `Store` state fields from `Compiler` (#1761)* Moves CodeMemory, VMInterrupts and SignatureRegistry from Compiler * CompiledModule holds CodeMemory and GdbJitImageRegistration * Store keeps track of its JIT code * Makes "jit_int.rs" stuff Send+Sync * Adds the threads example. List of files: /wasmtime-44.0.1/examples/hello.rs

9364eb1d - Refactor (#1524)

Mon, 20 Apr 2020 20:55:33 +0000

Refactor (#1524)* Compute instance exports on demand. Instead having instances eagerly compute a Vec of Externs, and bumping the refcount for each Extern, compute Externs on demand. This also enables `Instance::get_export` to avoid doing a linear search. This also means that the closure returned by `get0` and friends now holds an `InstanceHandle` to dynamically hold the instance live rather than being scoped to a lifetime. * Compute module imports and exports on demand too. And compute Extern::ty on demand too. * Add a utility function for computing an ExternType. * Add a utility function for looking up a function's signature. * Add a utility function for computing the ValType of a Global. * Rename wasmtime_environ::Export to EntityIndex. This helps differentiate it from other Export types in the tree, and describes what it is. * Fix a typo in a comment. * Simplify module imports and exports. * Make `Instance::exports` return the export names. This significantly simplifies the public API, as it's relatively common to need the names, and this avoids the need to do a zip with `Module::exports`. This also changes `ImportType` and `ExportType` to have public members instead of private members and accessors, as I find that simplifies the usage particularly in cases where there are temporary instances. * Remove `Instance::module`. This doesn't quite remove `Instance`'s `module` member, it gets a step closer. * Use a InstanceHandle utility function. * Don't consume self in the `Func::get*` methods. Instead, just create a closure containing the instance handle and the export for them to call. * Use `ExactSizeIterator` to avoid needing separate `num_*` methods. * Rename `Extern::func()` etc. to `into_func()` etc. * Revise examples to avoid using `nth`. * Add convenience methods to instance for getting specific extern types. * Use the convenience functions in more tests and examples. * Avoid cloning strings for `ImportType` and `ExportType`. * Remove more obviated clone() calls. * Simplify `Func`'s closure state. * Make wasmtime::Export's fields private. This makes them more consistent with ExportType. * Fix compilation error. * Make a lifetime parameter explicit, and use better lifetime names. Instead of 'me, use 'instance and 'module to make it clear what the lifetime is. * More lifetime cleanups. List of files: /wasmtime-44.0.1/examples/hello.rs

f63c3c81 - Add a first-class way of accessing caller's exports (#1290)

Wed, 18 Mar 2020 21:57:31 +0000

Add a first-class way of accessing caller's exports (#1290)* Add a first-class way of accessing caller's exports This commit is a continuation of #1237 and updates the API of `Func` to allow defining host functions which have easy access to a caller's memory in particular. The new APIs look like so: * The `Func::wrap*` family of functions was condensed into one `Func::wrap` function. * The ABI layer of conversions in `WasmTy` were removed * An optional `Caller<'_>` argument can be at the front of all host-defined functions now. The old way the wasi bindings looked up memory has been removed and is now replaced with the `Caller` type. The `Caller` type has a `get_export` method on it which allows looking up a caller's export by name, allowing you to get access to the caller's memory easily, and even during instantiation. * Add a temporary note * Move some docs List of files: /wasmtime-44.0.1/examples/hello.rs

3c51d3ad - Move all examples to a top-level directory (#1286)

Wed, 11 Mar 2020 20:37:24 +0000

Move all examples to a top-level directory (#1286)* Move all examples to a top-level directory This commit moves all API examples (Rust and C) to a top-level `examples` directory. This is intended to make it more discoverable and conventional as to where examples are located. Additionally all examples are now available in both Rust and C to see how to execute the example in the language you're familiar with. The intention is that as more languages are supported we'd add more languages as examples here too. Each example is also accompanied by either a `*.wat` file which is parsed as input, or a Rust project in a `wasm` folder which is compiled as input. A simple driver crate was also added to `crates/misc` which executes all the examples on CI, ensuring the C and Rust examples all execute successfully. List of files: /wasmtime-44.0.1/examples/hello.rs