deps: Update Arbitrary to 1.0; libfuzzer-sys to 0.4.0; wasm-smith to 0.4.0

cranelift/peepmatic/crates/fuzzing/Cargo.toml

@@ -8,7 +8,7 @@ publish = false
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-arbitrary = { version = "0.4.1", features = ["derive"] }
+arbitrary = { version = "1.0.0", features = ["derive"] }
 bincode = "1.2.1"
 env_logger = "0.8.1"
 fst = "0.4.1"

cranelift/peepmatic/crates/fuzzing/src/lib.rs

@@ -9,7 +9,6 @@
 use arbitrary::{Arbitrary, Unstructured};
 use rand::prelude::*;
 use std::fmt::Debug;
-use std::panic;
 use std::time;
 
 pub mod automata;
@@ -24,7 +23,7 @@ pub mod parser;
 /// for use with `cargo test` and CI.
 pub fn check<A>(mut f: impl FnMut(A))
 where
-    A: Clone + Debug + Arbitrary,
+    A: Clone + Debug + for<'a> Arbitrary<'a>,
 {
     let seed = rand::thread_rng().gen();
     let mut rng = rand::rngs::SmallRng::seed_from_u64(seed);
@@ -38,7 +37,7 @@ where
     let time_budget = time::Duration::from_secs(2);
     let then = time::Instant::now();
 
-    let (failing_input, panic_info) = loop {
+    loop {
         if num_checked > 0 && time::Instant::now().duration_since(then) > time_budget {
             eprintln!("Checked {} random inputs.", num_checked);
             return;
@@ -48,9 +47,7 @@ where
             Ok(input) => {
                 num_checked += 1;
                 eprintln!("Checking input: {:#?}", input);
-                if let Err(p) = panic::catch_unwind(panic::AssertUnwindSafe(|| f(input.clone()))) {
-                    break (input, p);
-                }
+                f(input.clone());
             }
             Err(e @ arbitrary::Error::NotEnoughData) => {
                 eprintln!("warning: {}", e);
@@ -97,23 +94,5 @@ where
         for i in 0..buf.len() {
             buf[i] = rng.gen();
         }
-    };
-
-    // Shrink the failing input.
-    let mut smallest_failing_input = failing_input;
-    let mut panic_info = panic_info;
-    'shrinking: loop {
-        eprintln!("Smallest failing input: {:#?}", smallest_failing_input);
-        for input in smallest_failing_input.shrink() {
-            if let Err(p) = panic::catch_unwind(panic::AssertUnwindSafe(|| f(input.clone()))) {
-                smallest_failing_input = input;
-                panic_info = p;
-                continue 'shrinking;
-            }
-        }
-        break;
     }
-
-    // Resume the panic for the smallest input.
-    panic::resume_unwind(panic_info);
 }