[WIP] wasm-smith for roundtrips

.github/workflows/rust.yml

@@ -36,3 +36,19 @@ jobs:
         cargo build --verbose
     - name: Run tests
       run: cargo test --verbose
+
+  fuzz:
+    name: Fuzzing
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - name: Build
+      run: |
+        rustup update nightly
+        cargo install cargo-fuzz
+        cargo +nightly fuzz build
+
+    - name: Fuzz
+      run: |
+        cargo +nightly fuzz run module -- -max_total_time=180
+        cargo +nightly fuzz run component -- -max_total_time=180

Cargo.toml

@@ -17,6 +17,7 @@ wasmparser = "0.215.0"
 tempfile = "3.10.1"
 serde_json = "1.0.121"
 log = "0.4.22"
+wasm-smith = "0.215.0"
 
 [dev-dependencies]
 wasmprinter = "0.215.0"

fuzz/.gitignore

@@ -0,0 +1,4 @@
+target
+corpus
+artifacts
+coverage

fuzz/Cargo.toml

@@ -0,0 +1,31 @@
+[package]
+name = "orca-fuzz"
+version = "0.0.0"
+publish = false
+edition = "2021"
+
+[package.metadata]
+cargo-fuzz = true
+
+[dependencies]
+libfuzzer-sys = "0.4"
+wasm-smith = "0.215.0"
+wasmprinter = "0.215.0"
+
+
+[dependencies.orca]
+path = ".."
+
+[[bin]]
+name = "component"
+path = "fuzz_targets/component.rs"
+test = false
+doc = false
+bench = false
+
+[[bin]]
+name = "module"
+path = "fuzz_targets/module.rs"
+test = false
+doc = false
+bench = false

fuzz/README.md

@@ -0,0 +1,23 @@
+How to run the fuzzer:
+
+```
+rustup update nightly
+```
+
+```
+cargo install cargo-fuzz
+```
+
+```
+cargo +nightly fuzz build
+```
+
+To run roundtrips for modules.
+```
+cargo +nightly fuzz run orca
+```
+
+To run roundtrips for components.
+```
+cargo +nightly fuzz run component
+```

fuzz/fuzz_targets/component.rs

@@ -0,0 +1,28 @@
+// fuzzing roundtrips for component
+#![no_main]
+
+use libfuzzer_sys::fuzz_target;
+use orca;
+use wasm_smith::Component;
+
+fuzz_target!(|comp: Component| {
+    let wasm_bytes = comp.to_bytes();
+    // write to file
+    use std::fs::File;
+    use std::io::prelude::*;
+    let mut file = File::create("temp.wat").unwrap();
+
+    let original = wasmprinter::print_bytes(wasm_bytes.clone())
+        .expect("couldn't convert original Wasm to wat");
+    file.write_all(&original.clone().into_bytes()).unwrap();
+    // println!("original:\n {:?}", original);
+
+    let mut wasm_comp = orca::Component::parse(&wasm_bytes, false).unwrap();
+    let roundtrip_bytes = wasm_comp.encode();
+
+    let roundtrip = wasmprinter::print_bytes(roundtrip_bytes.clone())
+        .expect("couldn't convert roundtrip Wasm to wat");
+    // println!("roundtrip:\n {:?}", roundtrip);
+
+    assert_eq!(original, roundtrip);
+});

fuzz/fuzz_targets/module.rs

@@ -0,0 +1,29 @@
+// fuzzing roundtrips for modules
+
+#![no_main]
+
+use libfuzzer_sys::fuzz_target;
+use orca;
+use wasm_smith::Module;
+
+fuzz_target!(|module: Module| {
+    let wasm_bytes = module.to_bytes();
+    // write to file
+    use std::fs::File;
+    use std::io::prelude::*;
+    let mut file = File::create("temp.wat").unwrap();
+
+    let original = wasmprinter::print_bytes(wasm_bytes.clone())
+        .expect("couldn't convert original Wasm to wat");
+    file.write_all(&original.clone().into_bytes()).unwrap();
+    // println!("original:\n {:?}", original);
+
+    let mut wasm_module = orca::Module::parse(&wasm_bytes, false).unwrap();
+    let roundtrip_bytes = wasm_module.encode();
+
+    let roundtrip = wasmprinter::print_bytes(roundtrip_bytes.clone())
+        .expect("couldn't convert roundtrip Wasm to wat");
+    // println!("roundtrip:\n {:?}", roundtrip);
+
+    assert_eq!(original, roundtrip);
+});