1 //! Fuzzing infrastructure for Wasmtime. 2 3 #![deny(missing_docs, missing_debug_implementations)] 4 5 pub mod generators; 6 pub mod oracles; 7 8 /// One time start up initialization for fuzzing: 9 /// 10 /// * Enables `env_logger`. 11 /// 12 /// * Restricts `rayon` to a single thread in its thread pool, for more 13 /// deterministic executions. 14 /// 15 /// If a fuzz target is taking raw input bytes from the fuzzer, it is fine to 16 /// call this function in the fuzz target's oracle or in the fuzz target 17 /// itself. However, if the fuzz target takes an `Arbitrary` type, and the 18 /// `Arbitrary` implementation is not derived and does interesting things, then 19 /// the `Arbitrary` implementation should call this function, since it runs 20 /// before the fuzz target itself. 21 pub(crate) fn init_fuzzing() { 22 static INIT: std::sync::Once = std::sync::Once::new(); 23 24 INIT.call_once(|| { 25 let _ = env_logger::try_init(); 26 27 rayon::ThreadPoolBuilder::new() 28 .num_threads(1) 29 .build_global() 30 .expect("should only initialize the rayon thread pool once!"); 31 }) 32 } 33