This repository is a hardened compatibility fork of Wasmer 2.3.0 for the Idena smart-contract runtime. It is not the current general-purpose Wasmer release, and this fork publishes no CLI packages or binaries. The installation commands later in this README install official Wasmer, not this code.

idena-wasm pins a reviewed commit from this repository and enables only the compiler, universal engine, Singlepass, middleware, and type surfaces required for Idena contract execution. Do not replace that pin with this repository's moving default branch.

• Cranelift, stale optional engines, advisory-bearing optional packages, and unused workspace members were removed from the Idena build path.
• WASI sandbox boundaries, C/Go FFI pointer validation, VM function-pointer handling, signal state, allocation limits, and modern-Rust compatibility were hardened.
• Compatible Rust dependencies and workflow actions were refreshed without changing the public Wasmer 2.3 crate version used by Idena.
• Fork CI checks the core API, Singlepass compiler, universal engine, C API, headless CLI, VM tests, formatting, warnings relevant to unsafe legacy patterns, and cargo audit.

• A much smaller legacy runtime surface than building all Wasmer 2.3 engines and integrations.
• Backported security and correctness fixes while retaining the API expected by the existing Idena Wasm wrapper.
• Current compiler diagnostics expose unsafe assumptions that older Rust toolchains did not report.

• This is still a legacy Wasmer 2.3 architecture. It does not automatically receive fixes from current Wasmer releases, and backports can be incomplete.
• Runtime changes are consensus-sensitive when consumed by Idena. A different engine, compiler, metering path, trap, or floating-point result can split contract execution between nodes.
• The repository default branch can advance beyond the revision used by idena-wasm. Only the exact commit in idena-wasm/Cargo.toml is part of the reviewed runtime set.
• The focused Idena checks pass on current Rust, but legacy crates still emit non-fatal lifetime-syntax and unused-import warnings. The entire historical workspace is not clean under a global -D warnings policy.
• Reduced features improve auditability but make this fork unsuitable as a drop-in replacement for applications that require LLVM, Cranelift, full Emscripten/WASI support, or the latest WebAssembly proposals.

Use the same Rust toolchain as the consuming idena-wasm revision, then run the commands maintained in .github/workflows/fork-ci.yml. At minimum:

cargo fmt --all -- --check
cargo check -p wasmer --no-default-features --features compiler,universal,singlepass
cargo test -p wasmer-vm --lib
cargo audit

The authoritative integration test is a locked idena-wasm build followed by the binding and full idena-go test suites.

Wasmer is a fast and secure WebAssembly runtime that enables super lightweight containers to run anywhere: from Desktop to the Cloud, Edge and IoT devices.

This document is also available in: 🇨🇳 中 文 -Chinese • 🇩🇪 Deutsch-German • 🇪🇸 Español-Spanish • 🇫🇷 Français-French • 🇯🇵 日本 語 -Japanese • 🇰🇷 한국인 -Korean.

• Secure by default. No file, network, or environment access, unless explicitly enabled.
• Supports WASI and Emscripten out of the box.
• Fast. Run WebAssembly at near-native speeds.
• Embeddable in multiple programming languages
• Compliant with latest WebAssembly Proposals (SIMD, Reference Types, Threads, ...)

Wasmer CLI ships as a single executable with no dependencies.

The commands in this section install the official Wasmer distribution. They do not install the Idena compatibility fork described above.

curl https://get.wasmer.io -sSfL | sh

You can start by running QuickJS, a small and embeddable Javascript engine compiled as a WebAssembly module (qjs.wasm):

$ wasmer qjs.wasm
QuickJS - Type "\h" for help
qjs > const i = 1 + 2;
qjs > console.log("hello " + i);
hello 3

• Use Wasmer from your Rust application
• Publish a Wasm package on WAPM
• Read more about Wasmer

The Wasmer runtime can be used as a library embedded in different languages, so you can use WebAssembly anywhere.

	Language	Package	Documentation
	Rust	wasmer Rust crate	Learn
	C	wasm.h header	Learn
	C++	wasm.hh header	Learn
	C#	WasmerSharp NuGet package	Learn
	D	wasmer Dub package	Learn
	Python	wasmer PyPI package	Learn
	Javascript	@wasmerio NPM packages	Learn
	Go	wasmer Go package	Learn
	PHP	wasm PECL package	Learn
	Ruby	wasmer Ruby Gem	Learn
	Java	wasmer/wasmer-jni Bintray package	Learn
	Elixir	wasmex hex package	Learn
	R	no published package	Learn
	Postgres	no published package	Learn
	Swift	no published package
	Zig	no published package
	Dart	wasm pub package
	Crystal	no published package	Learn
	Lisp	no published package
	Julia	no published package
	V	no published package

👋  Missing a language?

We appreciate your help! 💜

We recommend reading the following guide on how to contribute into a complex project successfully: https://mitchellh.com/writing/contributing-to-complex-projects

Check our docs on how to build Wasmer from source or test your changes.

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