wasm/test: Set up fuzzing of the module validation

wasm/validation_fuzz_test.cpp

@@ -0,0 +1,26 @@
+// SPDX-FileCopyrightText: 2024 Robin Lindén <[email protected]>
+//
+// SPDX-License-Identifier: BSD-2-Clause
+
+#include "wasm/validation.h"
+
+#include "wasm/byte_code_parser.h"
+
+#include <cstddef>
+#include <cstdint>
+#include <sstream>
+#include <string>
+#include <tuple>
+
+extern "C" int LLVMFuzzerTestOneInput(std::uint8_t const *data, std::size_t size);
+
+extern "C" int LLVMFuzzerTestOneInput(std::uint8_t const *data, std::size_t size) {
+    auto module = wasm::ByteCodeParser::parse_module(
+            std::stringstream{std::string{reinterpret_cast<char const *>(data), size}});
+    if (!module) {
+        return 0;
+    }
+
+    std::ignore = wasm::validation::validate(*module);
+    return 0;
+}