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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.
//
#include "ir/module-utils.h"
#include "pass.h"
#include "wasm-binary.h"
#include "wasm.h"
namespace wasm {
struct RoundTrip : public Pass {
// Reloading the wasm may alter function names etc., which means our global
// function effect tracking can get confused, and effects may seem to appear.
// To avoid that, mark this pass as adding effects, which will clear all
// cached effects and such.
bool addsEffects() override { return true; }
void run(Module* module) override {
BufferWithRandomAccess buffer;
// Save features, which would not otherwise make it through a round trip if
// the target features section has been stripped. We also need them in order
// to tell the builder which features to build with.
auto features = module->features;
// We need to know whether we should preserve the type order when we read
// the module back in.
bool preserveTypeOrder = !module->typeIndices.empty();
// Write, clear, and read the module
WasmBinaryWriter(module, buffer, getPassOptions()).write();
ModuleUtils::clearModule(*module);
auto input = buffer.getAsChars();
WasmBinaryReader parser(*module, features, input);
parser.setDWARF(getPassOptions().debugInfo);
try {
parser.read();
} catch (ParseException& p) {
p.dump(std::cerr);
std::cerr << '\n';
Fatal() << "error in parsing wasm binary";
}
if (!preserveTypeOrder) {
module->typeIndices.clear();
}
}
};
Pass* createRoundTripPass() { return new RoundTrip(); }
} // namespace wasm
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