// Copyright (c) 2019, the R8 project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
package com.android.tools.r8;

import static com.android.tools.r8.utils.ExceptionUtils.unwrapExecutionException;

import com.android.tools.r8.dex.ApplicationReader;
import com.android.tools.r8.dex.ApplicationWriter;
import com.android.tools.r8.dex.Marker.Tool;
import com.android.tools.r8.graph.AppInfo;
import com.android.tools.r8.graph.AppView;
import com.android.tools.r8.graph.DexApplication;
import com.android.tools.r8.graph.GraphLense;
import com.android.tools.r8.ir.conversion.IRConverter;
import com.android.tools.r8.naming.PrefixRewritingNamingLens;
import com.android.tools.r8.utils.AndroidApp;
import com.android.tools.r8.utils.ExceptionUtils;
import com.android.tools.r8.utils.InternalOptions;
import com.android.tools.r8.utils.ThreadUtils;
import com.android.tools.r8.utils.Timing;
import com.google.common.collect.ImmutableList;
import java.io.IOException;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;

/** The L8 compiler. */
@Keep
public class L8 {

  /**
   * Main API entry for the L8 compiler.
   *
   * @param command L8 command.
   */
  public static void run(L8Command command) throws CompilationFailedException {
    AndroidApp app = command.getInputApp();
    InternalOptions options = command.getInternalOptions();
    ExecutorService executor = ThreadUtils.getExecutorService(options);
    ExceptionUtils.withD8CompilationHandler(
        command.getReporter(),
        () -> {
          try {
            run(app, options, executor);
          } finally {
            executor.shutdown();
          }
        });
  }

  private static void run(AndroidApp inputApp, InternalOptions options, ExecutorService executor)
      throws IOException {
    Timing timing = new Timing("L8");
    try {
      // Disable global optimizations.
      options.disableGlobalOptimizations();

      DexApplication app = new ApplicationReader(inputApp, options, timing).read(executor);
      AppInfo appInfo = new AppInfo(app);

      AppView<?> appView = AppView.createForL8(appInfo, options);
      IRConverter converter = new IRConverter(appView, timing);
      app = converter.convertToDex(app, executor);
      assert appView.appInfo() == appInfo;

      // Close any internal archive providers now the application is fully processed.
      inputApp.closeInternalArchiveProviders();

      new ApplicationWriter(
              app,
              null,
              options,
              ImmutableList.of(options.getMarker(Tool.L8)),
              null,
              null,
              GraphLense.getIdentityLense(),
              PrefixRewritingNamingLens.createPrefixRewritingNamingLens(
                  options, converter.getAdditionalRewritePrefix()),
              null)
          .write(executor);
      options.printWarnings();
    } catch (ExecutionException e) {
      throw unwrapExecutionException(e);
    } finally {
      options.signalFinishedToConsumers();
      // Dump timings.
      if (options.printTimes) {
        timing.report();
      }
    }
  }
}