[NominalFuzzing] SignatureRefining: Ignore exported functions (#4601)

This hits the fuzzer when it tries to call reference exports with a null.

1 files changed, 36 insertions, 0 deletions

diff --git a/src/ir/export-utils.h b/src/ir/export-utils.h
new file mode 100644
index 000000000..245365fbc
--- /dev/null
+++ b/src/ir/export-utils.h
@@ -0,0 +1,36 @@
+/*
+ * Copyright 2022 WebAssembly Community Group participants
+ *
+ * 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.
+ */
+
+#ifndef wasm_ir_export_h
+#define wasm_ir_export_h
+
+#include "wasm.h"
+
+namespace wasm::ExportUtils {
+
+inline std::vector<Function*> getExportedFunctions(Module& wasm) {
+  std::vector<Function*> ret;
+  for (auto& ex : wasm.exports) {
+    if (ex->kind == ExternalKind::Function) {
+      ret.push_back(wasm.getFunction(ex->value));
+    }
+  }
+  return ret;
+}
+
+} // namespace wasm::ExportUtils
+
+#endif // wasm_ir_export_h