1 files changed, 71 insertions, 0 deletions
diff --git a/src/passes/RoundTrip.cpp b/src/passes/RoundTrip.cpp
new file mode 100644
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+++ b/src/passes/RoundTrip.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.
+ */
+
+//
+// Write the module to binary, and load it from there. This is useful in
+// testing to check for the effects of roundtripping in a single wasm-opt
+// parameter.
+//
+
+#ifdef _WIN32
+#include <io.h>
+#endif
+
+#include <cstdlib>
+#include <vector>
+
+#include "ir/module-utils.h"
+#include "pass.h"
+#include "support/file.h"
+#include "wasm-io.h"
+#include "wasm.h"
+
+using namespace std;
+
+namespace wasm {
+
+struct RoundTrip : public Pass {
+  void run(PassRunner* runner, Module* module) override {
+    std::string templateName = "byn_round_trip_XXXXXX";
+    std::vector<char> buffer(templateName.begin(), templateName.end());
+    buffer.push_back(0);
+#ifndef _WIN32
+    auto fd = mkstemp(buffer.data());
+    WASM_UNUSED(fd);
+    std::string tempName(buffer.begin(), buffer.end());
+#else
+    std::string tempName = _mktemp(buffer.data());
+#endif
+    // Write
+    ModuleWriter writer;
+    writer.setBinary(true);
+    writer.setDebugInfo(runner->options.debugInfo);
+    writer.write(*module, tempName);
+    // Read
+    Module newModule;
+    ModuleReader reader;
+    reader.read(tempName, newModule);
+    // Clean up
+    std::remove(tempName.c_str());
+    // Swap in
+    ModuleUtils::clearModule(*module);
+    ModuleUtils::copyModule(newModule, *module);
+  }
+};
+
+Pass* createRoundTripPass() { return new RoundTrip(); }
+
+} // namespace wasm