src/test/java/com/android/tools/r8/apimodel/ApiModelNoHorizontalMergeAndD8MergeTest.java

// Copyright (c) 2022, 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.apimodel;

import static com.android.tools.r8.apimodel.ApiModelingTestHelper.setMockApiLevelForClass;
import static com.android.tools.r8.apimodel.ApiModelingTestHelper.setMockApiLevelForMethod;
import static com.android.tools.r8.utils.codeinspector.Matchers.isAbsent;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;

import com.android.tools.r8.CompilationMode;
import com.android.tools.r8.OutputMode;
import com.android.tools.r8.SingleTestRunResult;
import com.android.tools.r8.TestBase;
import com.android.tools.r8.TestCompilerBuilder;
import com.android.tools.r8.TestParameters;
import com.android.tools.r8.TestParametersCollection;
import com.android.tools.r8.synthesis.globals.GlobalSyntheticsTestingConsumer;
import com.android.tools.r8.utils.AndroidApiLevel;
import com.android.tools.r8.utils.codeinspector.ClassSubject;
import com.android.tools.r8.utils.codeinspector.CodeInspector;
import com.android.tools.r8.utils.codeinspector.HorizontallyMergedClassesInspector;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.List;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameter;
import org.junit.runners.Parameterized.Parameters;

@RunWith(Parameterized.class)
public class ApiModelNoHorizontalMergeAndD8MergeTest extends TestBase {

  private final AndroidApiLevel oneMockLevel = AndroidApiLevel.M;
  private final AndroidApiLevel otherMockLevel = AndroidApiLevel.N;

  @Parameter() public TestParameters parameters;

  @Parameters(name = "{0}")
  public static TestParametersCollection data() {
    return getTestParameters().withDexRuntimes().withAllApiLevels().build();
  }

  private boolean isGreaterOrEqualToMockLevel() {
    return parameters.isDexRuntime()
        && parameters.getApiLevel().isGreaterThanOrEqualTo(oneMockLevel);
  }

  private void setupTestCompileBuilder(TestCompilerBuilder<?, ?, ?, ?, ?> testBuilder)
      throws NoSuchMethodException {
    testBuilder
        .addLibraryClasses(LibraryClass.class)
        .addDefaultRuntimeLibrary(parameters)
        .setMinApi(parameters.getApiLevel())
        .apply(ApiModelingTestHelper::enableApiCallerIdentification)
        .apply(ApiModelingTestHelper::enableOutliningOfMethods)
        .apply(setMockApiLevelForClass(LibraryClass.class, oneMockLevel))
        .apply(setMockApiLevelForMethod(LibraryClass.class.getDeclaredMethod("foo"), oneMockLevel))
        .apply(
            setMockApiLevelForMethod(LibraryClass.class.getDeclaredMethod("bar"), otherMockLevel));
  }

  private boolean addToBootClasspath() {
    return parameters.isDexRuntime()
        && parameters.getRuntime().maxSupportedApiLevel().isGreaterThanOrEqualTo(oneMockLevel);
  }

  @Test
  public void testD8DebugDexFilePerClassFile() throws Exception {
    testD8Merge(CompilationMode.DEBUG);
  }

  @Test
  public void testD8ReleaseDexFilePerClassFile() throws Exception {
    testD8Merge(CompilationMode.RELEASE);
  }

  private Path runD8ForClass(
      Class<?> clazz, GlobalSyntheticsTestingConsumer global, CompilationMode mode)
      throws Exception {
    return testForD8()
        .addProgramClasses(clazz)
        .setMode(mode)
        .setOutputMode(OutputMode.DexFilePerClassFile)
        .apply(b -> b.getBuilder().setGlobalSyntheticsConsumer(global))
        .apply(this::setupTestCompileBuilder)
        .compile()
        .writeToZip();
  }

  public void testD8Merge(CompilationMode mode) throws Exception {
    List<Path> paths = new ArrayList<>();
    GlobalSyntheticsTestingConsumer mainGlobals = new GlobalSyntheticsTestingConsumer();
    GlobalSyntheticsTestingConsumer testCallingFooGlobals = new GlobalSyntheticsTestingConsumer();
    GlobalSyntheticsTestingConsumer testCallingBarGlobals = new GlobalSyntheticsTestingConsumer();
    paths.add(runD8ForClass(Main.class, mainGlobals, mode));
    paths.add(runD8ForClass(TestCallingFoo.class, testCallingFooGlobals, mode));
    paths.add(runD8ForClass(TestCallingBar.class, testCallingBarGlobals, mode));
    assertFalse(mainGlobals.hasGlobals());
    assertFalse(testCallingFooGlobals.hasGlobals());
    assertFalse(testCallingBarGlobals.hasGlobals());
    testForD8()
        .setMode(mode)
        .addProgramFiles(paths)
        .apply(this::setupTestCompileBuilder)
        .addHorizontallyMergedClassesInspector(
            HorizontallyMergedClassesInspector::assertNoClassesMerged)
        .compile()
        .inspect(inspector -> inspect(inspector, mode))
        .applyIf(addToBootClasspath(), b -> b.addBootClasspathClasses(LibraryClass.class))
        .run(parameters.getRuntime(), Main.class)
        .apply(this::checkOutput);
  }

  private void inspect(CodeInspector inspector, CompilationMode mode) {
    ClassSubject libraryClassSubject = inspector.clazz(LibraryClass.class);
    if (isGreaterOrEqualToMockLevel()) {
      assertThat(libraryClassSubject, isAbsent());
    } else {
      assertEquals(5, inspector.allClasses().size());
    }
  }

  private void checkOutput(SingleTestRunResult<?> runResult) {
    runResult.assertSuccessWithOutputLinesIf(
        addToBootClasspath(), "LibraryClass::foo", "LibraryClass::bar");
    runResult.assertFailureWithErrorThatThrowsIf(!addToBootClasspath(), NoClassDefFoundError.class);
  }

  // Only present form api level 23.
  public static class LibraryClass {

    public static void foo() {
      System.out.println("LibraryClass::foo");
    }

    public static void bar() {
      System.out.println("LibraryClass::bar");
    }
  }

  public static class TestCallingFoo {

    public static void callFoo() {
      LibraryClass.foo();
    }
  }

  public static class TestCallingBar {

    public static void callBar() {
      LibraryClass.bar();
    }
  }

  public static class Main {

    public static void main(String[] args) {
      TestCallingFoo.callFoo();
      TestCallingBar.callBar();
    }
  }
}