src/passes/Strip.cpp

/*
 * Copyright 2018 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.
 */

//
// Similar to strip-ing a native binary, this removes debug info
// and related things like source map URLs, names section, etc.
//

#include "wasm.h"
#include "wasm-binary.h"
#include "pass.h"

using namespace std;

namespace wasm {

struct Strip : public Pass {
  void run(PassRunner* runner, Module* module) override {
    // Remove name and debug sections.
    auto& sections = module->userSections;
    sections.erase(
      std::remove_if(
        sections.begin(),
        sections.end(),
        [&](const UserSection& curr) {
          return curr.name == BinaryConsts::UserSections::Name ||
                 curr.name == BinaryConsts::UserSections::SourceMapUrl ||
                 curr.name.find(".debug") == 0 ||
                 curr.name.find("reloc..debug") == 0;
        }
      ),
      sections.end()
    );
    // Clean up internal data structures.
    module->clearDebugInfo();
    for (auto& func : module->functions) {
      func->clearNames();
      func->clearDebugInfo();
    }
  }
};

Pass *createStripPass() {
  return new Strip();
}

} // namespace wasm