7 files changed, 14 insertions, 0 deletions
diff --git a/src/ir/flat.h b/src/ir/flat.h
index 37b5dfb15..70a6beac7 100644
--- a/src/ir/flat.h
+++ b/src/ir/flat.h
@@ -116,6 +116,8 @@ inline void verifyFlatness(Module* module) {
         PostWalker<VerifyFlatness, UnifiedExpressionVisitor<VerifyFlatness>>> {
     bool isFunctionParallel() override { return true; }
 
+    bool modifiesBinaryenIR() override { return false; }
+
     VerifyFlatness* create() override { return new VerifyFlatness(); }
 
     void doVisitFunction(Function* func) { verifyFlatness(func); }
diff --git a/src/ir/hashed.h b/src/ir/hashed.h
index b1fd659bc..060fea453 100644
--- a/src/ir/hashed.h
+++ b/src/ir/hashed.h
@@ -29,6 +29,8 @@ namespace wasm {
 struct FunctionHasher : public WalkerPass<PostWalker<FunctionHasher>> {
   bool isFunctionParallel() override { return true; }
 
+  bool modifiesBinaryenIR() override { return false; }
+
   struct Map : public std::map<Function*, size_t> {};
 
   FunctionHasher(Map* output, ExpressionAnalyzer::ExprHasher customHasher)
diff --git a/src/ir/struct-utils.h b/src/ir/struct-utils.h
index e7b587958..ba5617de6 100644
--- a/src/ir/struct-utils.h
+++ b/src/ir/struct-utils.h
@@ -130,6 +130,8 @@ struct StructScanner
   : public WalkerPass<PostWalker<StructScanner<T, SubType>>> {
   bool isFunctionParallel() override { return true; }
 
+  bool modifiesBinaryenIR() override { return false; }
+
   StructScanner(FunctionStructValuesMap<T>& functionNewInfos,
                 FunctionStructValuesMap<T>& functionSetGetInfos)
     : functionNewInfos(functionNewInfos),
diff --git a/src/passes/NameList.cpp b/src/passes/NameList.cpp
index 1051a31d1..a0078e263 100644
--- a/src/passes/NameList.cpp
+++ b/src/passes/NameList.cpp
@@ -26,6 +26,8 @@
 namespace wasm {
 
 struct NameList : public Pass {
+  bool modifiesBinaryenIR() override { return false; }
+
   void run(PassRunner* runner, Module* module) override {
     ModuleUtils::iterDefinedFunctions(*module, [&](Function* func) {
       std::cout << "    " << func->name << " : "
diff --git a/src/passes/OnceReduction.cpp b/src/passes/OnceReduction.cpp
index fd38aeafe..1eb76c29e 100644
--- a/src/passes/OnceReduction.cpp
+++ b/src/passes/OnceReduction.cpp
@@ -84,6 +84,8 @@ struct OptInfo {
 struct Scanner : public WalkerPass<PostWalker<Scanner>> {
   bool isFunctionParallel() override { return true; }
 
+  bool modifiesBinaryenIR() override { return false; }
+
   Scanner(OptInfo& optInfo) : optInfo(optInfo) {}
 
   Scanner* create() override { return new Scanner(optInfo); }
diff --git a/src/passes/PrintFeatures.cpp b/src/passes/PrintFeatures.cpp
index 53ef6676f..6b89e18d6 100644
--- a/src/passes/PrintFeatures.cpp
+++ b/src/passes/PrintFeatures.cpp
@@ -25,6 +25,8 @@
 namespace wasm {
 
 struct PrintFeatures : public Pass {
+  bool modifiesBinaryenIR() override { return false; }
+
   void run(PassRunner* runner, Module* module) override {
     module->features.iterFeatures([](FeatureSet::Feature f) {
       std::cout << "--enable-" << FeatureSet::toString(f) << std::endl;
diff --git a/src/passes/ReorderFunctions.cpp b/src/passes/ReorderFunctions.cpp
index 326893951..7d2e7fb53 100644
--- a/src/passes/ReorderFunctions.cpp
+++ b/src/passes/ReorderFunctions.cpp
@@ -40,6 +40,8 @@ typedef std::unordered_map<Name, std::atomic<Index>> NameCountMap;
 struct CallCountScanner : public WalkerPass<PostWalker<CallCountScanner>> {
   bool isFunctionParallel() override { return true; }
 
+  bool modifiesBinaryenIR() override { return false; }
+
   CallCountScanner(NameCountMap* counts) : counts(counts) {}
 
   CallCountScanner* create() override { return new CallCountScanner(counts); }