src/test/java/com/android/tools/r8/R8UnreachableCodeTest.java

// Copyright (c) 2016, 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 org.junit.Assert.assertEquals;

import com.android.tools.r8.dex.ApplicationReader;
import com.android.tools.r8.graph.AppInfoWithSubtyping;
import com.android.tools.r8.graph.DexEncodedMethod;
import com.android.tools.r8.graph.DexProgramClass;
import com.android.tools.r8.graph.DirectMappedDexApplication;
import com.android.tools.r8.ir.conversion.IRConverter;
import com.android.tools.r8.utils.AndroidApp;
import com.android.tools.r8.utils.InternalOptions;
import com.android.tools.r8.utils.Timing;
import java.io.IOException;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import org.junit.Test;

public class R8UnreachableCodeTest {

  private static final Path SMALI_DIR = Paths.get(ToolHelper.SMALI_BUILD_DIR);

  @Test
  public void UnreachableCode() throws IOException, ExecutionException, CompilationException {
    String name = "unreachable-code-1";
    AndroidApp input = AndroidApp.fromProgramFiles(SMALI_DIR.resolve(name).resolve(name + ".dex"));
    ExecutorService executorService = Executors.newSingleThreadExecutor();
    Timing timing = new Timing("R8UnreachableCodeTest");
    DirectMappedDexApplication application =
        new ApplicationReader(input, new InternalOptions(), timing)
            .read(executorService)
            .toDirect();
    IRConverter converter =
        new IRConverter(new AppInfoWithSubtyping(application), new InternalOptions());
    converter.optimize(application);
    DexProgramClass clazz = application.classes().iterator().next();
    assertEquals(4, clazz.directMethods().length);
    for (DexEncodedMethod method : clazz.directMethods()) {
      if (!method.method.name.toString().equals("main")) {
        assertEquals(2, method.getCode().asDexCode().instructions.length);
      }
    }
  }
}