It performs the translation from a Wasm module into a basic ModuleInfo, but leaves the Wasm function bytecode translation to the compiler implementor.

Here are some of the Compilers provided by Wasmer:

How to create a compiler

Creating a new compiler is quite easy, you just need to impement two traits: CompilerConfig and Compiler:

/// The compiler configuration options.
pub trait CompilerConfig {
    /// Gets the custom compiler config
    fn compiler(&self) -> Box<dyn Compiler + Send>;
}

/// An implementation of a Compiler from parsed WebAssembly module to Compiled native code.
pub trait Compiler {
    /// Compiles a parsed module.
    ///
    /// It returns the [`Compilation`] or a [`CompileError`].
    fn compile_module<'data, 'module>(
        &self,
        target: &Target,
        compile_info: &'module CompileModuleInfo,
        module_translation: &ModuleTranslationState,
        // The list of function bodies
        function_body_inputs: PrimaryMap<LocalFunctionIndex, FunctionBodyData<'data>>,
    ) -> Result<Compilation, CompileError>;
}

Acknowledgments

This project borrowed some of the code strucutre from the cranelift-wasm crate, however it's been adapted to not depend on any specific IR and be abstract of any compiler.

Please check Wasmer ATTRIBUTIONS to further see licenses and other attributions of the project.