Function build

crates/fuzzing/src/oracles/engine.rs:13–50

Returns a function which can be used to build the engine name specified. `None` is returned if the named engine does not have support compiled into this crate.

(
    u: &mut Unstructured<'_>,
    name: &str,
    config: &mut Config,
)

/// `None` is returned if the named engine does not have support compiled into
/// this crate.
pub fn build(
    u: &mut Unstructured<'_>,
    name: &str,
    config: &mut Config,
) -> arbitrary::Result<Option<Box<dyn DiffEngine>>> {
    let engine: Box<dyn DiffEngine> = match name {
        "wasmtime" => Box::new(WasmtimeEngine::new(
            u,
            config,
            CompilerStrategy::CraneliftNative,
        )?),
        "pulley" => Box::new(WasmtimeEngine::new(
            u,
            config,
            CompilerStrategy::CraneliftPulley,
        )?),
        "wasmi" => Box::new(WasmiEngine::new(config)),

        #[cfg(any(target_arch = "x86_64", target_arch = "aarch64"))]
        "winch" => Box::new(WasmtimeEngine::new(u, config, CompilerStrategy::Winch)?),
        #[cfg(not(any(target_arch = "x86_64", target_arch = "aarch64")))]
        "winch" => return Ok(None),

        #[cfg(feature = "fuzz-spec-interpreter")]
        "spec" => Box::new(crate::oracles::diff_spec::SpecInterpreter::new(config)),
        #[cfg(not(feature = "fuzz-spec-interpreter"))]
        "spec" => return Ok(None),

        #[cfg(feature = "v8")]
        "v8" => Box::new(crate::oracles::diff_v8::V8Engine::new(config)),
        #[cfg(not(feature = "v8"))]
        "v8" => return Ok(None),

        _ => panic!("unknown engine {name}"),
    };

    Ok(Some(engine))
}

/// Provide a way to instantiate Wasm modules.
pub trait DiffEngine {