4 files changed, 15 insertions, 4 deletions
diff --git a/src/passes/I64ToI32Lowering.cpp b/src/passes/I64ToI32Lowering.cpp
index 697df1eef..9e6fd106b 100644
--- a/src/passes/I64ToI32Lowering.cpp
+++ b/src/passes/I64ToI32Lowering.cpp
@@ -175,6 +175,9 @@ struct I64ToI32Lowering : public WalkerPass<PostWalker<I64ToI32Lowering>> {
   }
 
   void visitFunction(Function* func) {
+    if (func->imported()) {
+      return;
+    }
     if (func->result == i64) {
       func->result = i32;
       // body may not have out param if it ends with control flow
diff --git a/src/passes/LogExecution.cpp b/src/passes/LogExecution.cpp
index 45a29eae9..65a802a2f 100644
--- a/src/passes/LogExecution.cpp
+++ b/src/passes/LogExecution.cpp
@@ -42,6 +42,9 @@ struct LogExecution : public WalkerPass<PostWalker<LogExecution>> {
   }
 
   void visitFunction(Function* curr) {
+    if (curr->imported()) {
+      return;
+    }
     curr->body = makeLogCall(curr->body);
   }
 
diff --git a/src/tools/wasm-reduce.cpp b/src/tools/wasm-reduce.cpp
index f31c11edd..bee6ba621 100644
--- a/src/tools/wasm-reduce.cpp
+++ b/src/tools/wasm-reduce.cpp
@@ -524,9 +524,11 @@ struct Reducer : public WalkerPass<PostWalker<Reducer, UnifiedExpressionVisitor<
   }
 
   void visitFunction(Function* curr) {
-    // extra chance to work on the function toplevel element, as if it can
-    // be reduced it's great
-    visitExpression(curr->body);
+    if (!curr->imported()) {
+      // extra chance to work on the function toplevel element, as if it can
+      // be reduced it's great
+      visitExpression(curr->body);
+    }
     // finish function
     funcsSeen++;
     static int last = 0;
@@ -677,7 +679,7 @@ struct Reducer : public WalkerPass<PostWalker<Reducer, UnifiedExpressionVisitor<
     if (module->functions.size() == 1 && module->exports.empty() && module->table.segments.empty()) {
       auto* func = module->functions[0].get();
       // We can't remove something that might have breaks to it.
-      if (!Properties::isNamedControlFlow(func->body)) {
+      if (!func->imported() && !Properties::isNamedControlFlow(func->body)) {
         auto funcType = func->type;
         auto funcResult = func->result;
         auto* funcBody = func->body;
diff --git a/src/wasm/wasm-emscripten.cpp b/src/wasm/wasm-emscripten.cpp
index 6667ac855..78d2d25c6 100644
--- a/src/wasm/wasm-emscripten.cpp
+++ b/src/wasm/wasm-emscripten.cpp
@@ -489,6 +489,9 @@ struct EmJsWalker : public PostWalker<EmJsWalker> {
       segmentOffsets(getSegmentOffsets(wasm)) { }
 
   void visitFunction(Function* curr) {
+    if (curr->imported()) {
+      return;
+    }
     if (!curr->name.startsWith(EM_JS_PREFIX.str)) {
       return;
     }