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diff --git a/src/passes/GenerateDynCalls.cpp b/src/passes/GenerateDynCalls.cpp
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+++ b/src/passes/GenerateDynCalls.cpp
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+/*
+ * Copyright 2020 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.
+ */
+
+//
+// Create `dynCall` helper functions used by emscripten.  These allow JavaScript
+// to call back into WebAssembly given a function pointer (table index). These
+// are used primarily to implement the `invoke` functions which in turn are used
+// to implment exceptions handling and setjmp/longjmp.  Creates one for each
+// signature in the indirect function table.
+//
+
+#include "abi/js.h"
+#include "asm_v_wasm.h"
+#include "ir/import-utils.h"
+#include "pass.h"
+#include "support/debug.h"
+#include "wasm-emscripten.h"
+
+#define DEBUG_TYPE "generate-dyncalls"
+
+namespace wasm {
+
+struct GenerateDynCalls : public WalkerPass<PostWalker<GenerateDynCalls>> {
+
+  void visitTable(Table* table) {
+    if (table->segments.size() > 0) {
+      EmscriptenGlueGenerator generator(*getModule());
+      std::vector<Name> tableSegmentData;
+      for (const auto& indirectFunc : table->segments[0].data) {
+        generator.generateDynCallThunk(
+          getModule()->getFunction(indirectFunc)->sig);
+      }
+    }
+  }
+};
+
+Pass* createGenerateDynCallsPass() { return new GenerateDynCalls; }
+
+} // namespace wasm