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diff --git a/src/passes/PrintFunctionMap.cpp b/src/passes/PrintFunctionMap.cpp
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+/*
+ * Copyright 2019 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.
+ */
+
+//
+// Prints the a map of function indexes to function names. This can be
+// useful for interpreting a stack trace from a production environment
+// where names did not exist on the client. The map looks like this:
+//
+// 0:foo
+// 1:bar
+// 2:baz
+//
+
+#include "pass.h"
+#include "wasm.h"
+
+namespace wasm {
+
+struct PrintFunctionMap : public Pass {
+  bool modifiesBinaryenIR() override { return false; }
+
+  void run(PassRunner* runner, Module* module) override {
+    Index i = 0;
+    for (auto& func : module->functions) {
+      std::cout << i++ << ':' << func->name.str << '\n';
+    }
+  }
+};
+
+Pass* createPrintFunctionMapPass() { return new PrintFunctionMap(); }
+
+} // namespace wasm