1 files changed, 42 insertions, 0 deletions
diff --git a/src/ir/properties.cpp b/src/ir/properties.cpp
new file mode 100644
index 000000000..889ece57b
--- /dev/null
+++ b/src/ir/properties.cpp
@@ -0,0 +1,42 @@
+/*
+ * Copyright 2021 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.
+ */
+
+#include "ir/properties.h"
+#include "wasm-traversal.h"
+
+namespace wasm {
+
+namespace Properties {
+
+bool isIntrinsicallyNondeterministic(Expression* curr, FeatureSet features) {
+  // Practically no wasm instructions are intrinsically nondeterministic.
+  // Exceptions occur only in GC atm.
+  if (!features.hasGC()) {
+    return false;
+  }
+
+  struct Scanner : public PostWalker<Scanner> {
+    bool deterministic = true;
+    void visitStructNew(StructNew* curr) { deterministic = false; }
+    void visitArrayNew(ArrayNew* curr) { deterministic = false; }
+  } scanner;
+  scanner.walk(curr);
+  return !scanner.deterministic;
+}
+
+} // namespace Properties
+
+} // namespace wasm