638dc4e0b3
This adds full support for all Cranelift SIMD instructions to the s390x target. Everything is matched fully via ISLE. In addition to adding support for many new instructions, and the lower.isle code to match all SIMD IR patterns, this patch also adds ABI support for vector types. In particular, we now need to handle the fact that vector registers 8 .. 15 are partially callee-saved, i.e. the high parts of those registers (which correspond to the old floating-poing registers) are callee-saved, but the low parts are not. This is the exact same situation that we already have on AArch64, and so this patch uses the same solution (the is_included_in_clobbers callback). The bulk of the changes are platform-specific, but there are a few exceptions: - Added ISLE extractors for the Immediate and Constant types, to enable matching the vconst and swizzle instructions. - Added a missing accessor for call_conv to ABISig. - Fixed endian conversion for vector types in data_value.rs to enable their use in runtests on the big-endian platforms. - Enabled (nearly) all SIMD runtests on s390x. [ Two test cases remain disabled due to vector shift count semantics, see below. ] - Enabled all Wasmtime SIMD tests on s390x. There are three minor issues, called out via FIXMEs below, which should be addressed in the future, but should not be blockers to getting this patch merged. I've opened the following issues to track them: - Vector shift count semantics https://github.com/bytecodealliance/wasmtime/issues/4424 - is_included_in_clobbers vs. link register https://github.com/bytecodealliance/wasmtime/issues/4425 - gen_constant callback https://github.com/bytecodealliance/wasmtime/issues/4426 All tests, including all newly enabled SIMD tests, pass on both z14 and z15 architectures.
wasmtime
A standalone runtime for WebAssembly
A Bytecode Alliance project
Guide | Contributing | Website | Chat
Installation
The Wasmtime CLI can be installed on Linux and macOS with a small install script:
curl https://wasmtime.dev/install.sh -sSf | bash
Windows or otherwise interested users can download installers and binaries directly from the GitHub Releases page.
Example
If you've got the Rust compiler installed then you can take some Rust source code:
fn main() {
println!("Hello, world!");
}
and compile/run it with:
$ rustup target add wasm32-wasi
$ rustc hello.rs --target wasm32-wasi
$ wasmtime hello.wasm
Hello, world!
Features
-
Fast. Wasmtime is built on the optimizing Cranelift code generator to quickly generate high-quality machine code either at runtime or ahead-of-time. Wasmtime's runtime is also optimized for cases such as efficient instantiation, low-overhead transitions between the embedder and wasm, and scalability of concurrent instances.
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Secure. Wasmtime's development is strongly focused on the correctness of its implementation with 24/7 fuzzing donated by Google's OSS Fuzz, leveraging Rust's API and runtime safety guarantees, careful design of features and APIs through an RFC process, a security policy in place for when things go wrong, and a release policy for patching older versions as well. We follow best practices for defense-in-depth and known protections and mitigations for issues like Spectre. Finally, we're working to push the state-of-the-art by collaborating with academic researchers to formally verify critical parts of Wasmtime and Cranelift.
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Configurable. Wastime supports a rich set of APIs and build time configuration to provide many options such as further means of restricting WebAssembly beyond its basic guarantees such as its CPU and Memory consumption. Wasmtime also runs in tiny environments all the way up to massive servers with many concurrent instances.
-
WASI. Wasmtime supports a rich set of APIs for interacting with the host environment through the WASI standard.
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Standards Compliant. Wasmtime passes the official WebAssembly test suite, implements the official C API of wasm, and implements future proposals to WebAssembly as well. Wasmtime developers are intimately engaged with the WebAssembly standards process all along the way too.
Language Support
You can use Wasmtime from a variety of different languages through embeddings of the implementation:
- Rust - the
wasmtimecrate - C - the
wasm.h,wasi.h, andwasmtime.hheaders or usewasmtimeConan package - C++ - the
wasmtime-cpprepository or usewasmtime-cppConan package - Python - the
wasmtimePyPI package - .NET - the
WasmtimeNuGet package - Go - the
wasmtime-gorepository
Documentation
📚 Read the Wasmtime guide here! 📚
The wasmtime guide is the best starting point to learn about what Wasmtime can do for you or help answer your questions about Wasmtime. If you're curious in contributing to Wasmtime, it can also help you do that!
It's Wasmtime.