f4a2d5337a
* Switch duplicate loads w/ dynamic memories test to `min_size = 0` This test was accidentally hitting a special case for bounds checks for when we know that `offset + access_size < min_size` and can skip some steps. This commit changes the `min_size` of the memory to zero so that we are forced to do fully general bounds checks. * Cranelift: Mark `uadd_overflow_trap` as okay for GVN Although this improves our test sequence for duplicate loads with dynamic memories, it unfortunately doesn't have any effect on sightglass benchmarks: ``` instantiation :: instructions-retired :: benchmarks/pulldown-cmark/benchmark.wasm No difference in performance. [34448 35607.23 37158] gvn_uadd_overflow_trap.so [34566 35734.05 36585] main.so instantiation :: instructions-retired :: benchmarks/spidermonkey/benchmark.wasm No difference in performance. [44101 60449.62 92712] gvn_uadd_overflow_trap.so [44011 60436.37 92690] main.so instantiation :: instructions-retired :: benchmarks/bz2/benchmark.wasm No difference in performance. [35595 36675.72 38153] gvn_uadd_overflow_trap.so [35440 36670.42 37993] main.so compilation :: instructions-retired :: benchmarks/bz2/benchmark.wasm No difference in performance. [17370195 17405125.62 17471222] gvn_uadd_overflow_trap.so [17369324 17404859.43 17470725] main.so execution :: instructions-retired :: benchmarks/spidermonkey/benchmark.wasm No difference in performance. [7055720520 7055886880.32 7056265930] gvn_uadd_overflow_trap.so [7055719554 7055843809.33 7056193289] main.so compilation :: instructions-retired :: benchmarks/spidermonkey/benchmark.wasm No difference in performance. [683589861 683767276.00 684098366] gvn_uadd_overflow_trap.so [683590024 683767998.02 684097885] main.so execution :: instructions-retired :: benchmarks/pulldown-cmark/benchmark.wasm No difference in performance. [46436883 46437135.10 46437823] gvn_uadd_overflow_trap.so [46436883 46437087.67 46437785] main.so compilation :: instructions-retired :: benchmarks/pulldown-cmark/benchmark.wasm No difference in performance. [126522461 126565812.58 126647044] gvn_uadd_overflow_trap.so [126522176 126565757.75 126647522] main.so execution :: instructions-retired :: benchmarks/bz2/benchmark.wasm No difference in performance. [653010531 653010533.03 653010544] gvn_uadd_overflow_trap.so [653010531 653010533.18 653010537] main.so ``` * cranelift-codegen-meta: Rename `side_effects_okay_for_gvn` to `side_effects_idempotent` * cranelift-filetests: Ensure there is a trailing newline for blessed Wasm tests
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 is optimized for efficient instantiation, low-overhead calls between the embedder and wasm, and scalability of concurrent instances.
-
Secure. Wasmtime's development is strongly focused on correctness and security. Building on top of Rust's runtime safety guarantees, each Wasmtime feature goes through careful review and consideration via an RFC process. Once features are designed and implemented, they undergo 24/7 fuzzing donated by Google's OSS Fuzz. As features stabilize they become part of a release, and when things go wrong we have a well-defined security policy in place to quickly mitigate and patch any issues. We follow best practices for defense-in-depth and integrate 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.
-
Configurable. Wasmtime uses sensible defaults, but can also be configured to provide more fine-grained control over things like CPU and memory consumption. Whether you want to run Wasmtime in a tiny environment or on massive servers with many concurrent instances, we've got you covered.
-
WASI. Wasmtime supports a rich set of APIs for interacting with the host environment through the WASI standard.
-
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, CMake orwasmtimeConan package - C++ - the
wasmtime-cpprepository or usewasmtime-cppConan package - Python - the
wasmtimePyPI package - .NET - the
WasmtimeNuGet package - Go - the
wasmtime-gorepository - Ruby - the
wasmtimegem
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.