src/test/java/com/android/tools/r8/keepanno/MethodNameStringPatternsTest.java

// Copyright (c) 2024, 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.keepanno;

import static com.android.tools.r8.utils.codeinspector.Matchers.isAbsent;
import static com.android.tools.r8.utils.codeinspector.Matchers.isPresent;
import static com.android.tools.r8.utils.codeinspector.Matchers.isPresentAndRenamed;
import static org.hamcrest.MatcherAssert.assertThat;

import com.android.tools.r8.keepanno.annotations.KeepItemKind;
import com.android.tools.r8.keepanno.annotations.KeepTarget;
import com.android.tools.r8.keepanno.annotations.StringPattern;
import com.android.tools.r8.keepanno.annotations.UsedByReflection;
import com.android.tools.r8.keepanno.annotations.UsesReflection;
import com.android.tools.r8.utils.AndroidApiLevel;
import com.android.tools.r8.utils.StringUtils;
import com.android.tools.r8.utils.codeinspector.CodeInspector;
import com.google.common.collect.ImmutableList;
import java.lang.reflect.Method;
import java.util.List;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameter;

@RunWith(Parameterized.class)
public class MethodNameStringPatternsTest extends KeepAnnoTestBase {

  static final String EXPECTED = StringUtils.lines("1");

  @Parameter public KeepAnnoParameters parameters;

  @Parameterized.Parameters(name = "{0}")
  public static List<KeepAnnoParameters> data() {
    return createParameters(
        getTestParameters().withDefaultRuntimes().withApiLevel(AndroidApiLevel.B).build());
  }

  @Test
  public void test() throws Exception {
    testForKeepAnno(parameters)
        .enableNativeInterpretation()
        .addProgramClasses(getInputClasses())
        .setExcludedOuterClass(getClass())
        .run(TestClass.class)
        .assertSuccessWithOutput(EXPECTED)
        .applyIf(parameters.isShrinker(), r -> r.inspect(this::checkOutput));
  }

  public List<Class<?>> getInputClasses() {
    return ImmutableList.of(TestClass.class, A.class, B.class);
  }

  private void checkOutput(CodeInspector inspector) {
    assertThat(inspector.clazz(B.class), isPresentAndRenamed());
    assertThat(inspector.clazz(B.class).method("void", "bar"), isAbsent());
    assertThat(inspector.clazz(B.class).method("int", "getMyI"), isPresent());
    assertThat(inspector.clazz(B.class).method("void", "setMyI", "int"), isPresent());
    assertThat(inspector.clazz(B.class).method("java.lang.String", "getMyS"), isAbsent());
    assertThat(inspector.clazz(B.class).method("void", "setMyS", "java.lang.String"), isAbsent());
  }

  static class A {

    @UsesReflection({
      @KeepTarget(
          classConstant = B.class,
          methodNamePattern = @StringPattern(startsWith = "get", endsWith = "I")),
      @KeepTarget(
          classConstant = B.class,
          methodNamePattern = @StringPattern(startsWith = "set", endsWith = "I")),
    })
    public void foo() throws Exception {
      int counter = 1;
      for (Method method : B.class.getDeclaredMethods()) {
        String name = method.getName();
        if (name.startsWith("set")) {
          if (name.endsWith("I")) {
            method.invoke(null, counter++);
          }
        }
      }
      for (Method method : B.class.getDeclaredMethods()) {
        String name = method.getName();
        if (name.startsWith("get")) {
          if (name.endsWith("I")) {
            System.out.println(method.invoke(null));
          }
        }
      }
    }
  }

  static class B {
    private static int i;
    private static String s;

    public static int getMyI() {
      return i;
    }

    public static String getMyS() {
      return s;
    }

    public static void setMyI(int i) {
      B.i = i;
    }

    public static void setMyS(String s) {
      B.s = s;
    }

    public static void bar() {
      throw new RuntimeException("UNUSED");
    }
  }

  static class TestClass {

    @UsedByReflection(kind = KeepItemKind.CLASS_AND_METHODS)
    public static void main(String[] args) throws Exception {
      new A().foo();
    }
  }
}