1 files changed, 75 insertions, 0 deletions
diff --git a/js/src/fuzz-tests/gluesmith/src/lib.rs b/js/src/fuzz-tests/gluesmith/src/lib.rs
new file mode 100644
index 0000000000..2efb678a03
--- /dev/null
+++ b/js/src/fuzz-tests/gluesmith/src/lib.rs
@@ -0,0 +1,75 @@
+/* Copyright 2021 Mozilla Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+extern crate arbitrary;
+extern crate wasm_smith;
+
+use arbitrary::{Arbitrary, Unstructured};
+use wasm_smith::{Config, Module};
+
+use std::ptr;
+
+// A custom configuration to enable all experimental features that we have
+// some support for.
+#[derive(Arbitrary, Debug)]
+struct SpiderMonkeyConfig;
+
+impl Config for SpiderMonkeyConfig {
+    fn bulk_memory_enabled(&self) -> bool {
+        true
+    }
+    fn reference_types_enabled(&self) -> bool {
+        true
+    }
+    fn exceptions_enabled(&self) -> bool {
+        true
+    }
+    fn memory64_enabled(&self) -> bool {
+        true
+    }
+    fn simd_enabled(&self) -> bool {
+        true
+    }
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn gluesmith(
+    data: *mut u8,
+    len: usize,
+    out: *mut u8,
+    maxlen: usize,
+) -> usize {
+    let buf: &[u8] = std::slice::from_raw_parts(data, len);
+
+    let mut u = Unstructured::new(buf);
+
+    let module = match Module::new(SpiderMonkeyConfig {}, &mut u) {
+        Ok(m) => m,
+        Err(_e) => return 0,
+    };
+
+    let wasm_bytes = module.to_bytes();
+
+    let src_len = wasm_bytes.len();
+
+    if src_len > maxlen {
+        return 0;
+    }
+
+    let src_ptr = wasm_bytes.as_ptr();
+    ptr::copy_nonoverlapping(src_ptr, out, src_len);
+
+    return src_len;
+}