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

// Copyright (c) 2026, 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.DiagnosticsMatcher.diagnosticMessage;
import static org.hamcrest.CoreMatchers.containsString;
import static org.hamcrest.CoreMatchers.equalTo;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;

import com.android.tools.r8.origin.CommandLineOrigin;
import com.android.tools.r8.utils.internal.FileUtils;
import com.android.tools.r8.utils.internal.StringUtils;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameters;
import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;

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

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

  public ApiDatabaseGeneratorTest(TestParameters parameters) {
    parameters.assertNoneRuntime();
  }

  @Test
  public void testGenerator() throws Exception {
    Path apiVersionsXml =
        writeApiXmlWithObject(
            "api-versions.xml",
            "  <class name=\"android/Foo\" since=\"30\">",
            "    <extends name=\"java/lang/Object\"/>",
            "    <method name=\"bar()V\" since=\"31\"/>",
            "  </class>");
    Path dummyJar =
        writeJar(
            "dummy.jar",
            new JarClassBuilder("android/Foo", "java/lang/Object").addMethod("bar()V"));

    Path outputDb = temp.newFile("api_database.ser").toPath();

    ApiDatabaseGeneratorCommand command =
        ApiDatabaseGeneratorCommand.builder()
            .addInputPath(apiVersionsXml)
            .addInputPath(dummyJar)
            .setOutputPath(outputDb)
            .build();

    ApiDatabaseGenerator.run(command);

    assertTrue(Files.exists(outputDb));
    assertTrue(Files.size(outputDb) > 0);
  }

  @Test
  public void testGeneratorWithMergeAndErrors() throws Exception {
    Path apiVersionsXml1 =
        writeApiXmlWithObject(
            "api-versions-1.xml",
            "  <class name=\"android/Foo\" since=\"30\">",
            "    <extends name=\"java/lang/Object\"/>",
            "    <method name=\"bar()V\" since=\"31\"/>",
            "  </class>");

    Path apiVersionsXml2 =
        writeApiXml(
            "api-versions-2.xml",
            "  <class name=\"android/Foo\" since=\"30\">",
            "    <extends name=\"java/lang/Object\"/>",
            "    <method name=\"bar()V\" since=\"31\"/>",
            "    <field name=\"baz\" since=\"33\"/>",
            "  </class>");
    Path dummyJar =
        writeJar(
            "dummy.jar",
            new JarClassBuilder("android/Foo", "java/lang/Object")
                .addMethod("bar()V")
                .addField("baz"));

    Path outputDb = temp.newFile("api_database.ser").toPath();

    TestDiagnosticMessagesImpl diagnosticsHandler = new TestDiagnosticMessagesImpl();
    ApiDatabaseGeneratorCommand command =
        ApiDatabaseGeneratorCommand.builder(diagnosticsHandler)
            .addInputPath(apiVersionsXml1)
            .addInputPath(apiVersionsXml2)
            .addInputPath(dummyJar)
            .setOutputPath(outputDb)
            .build();

    try {
      ApiDatabaseGenerator.run(command);
      fail("Expected API database generation to fail due to duplicate entries");
    } catch (ApiDatabaseGeneratorException e) {
      // Expected.
    }

    diagnosticsHandler.assertErrorsMatch(
        diagnosticMessage(containsString("Duplicate class android.Foo")));
  }

  @Test
  public void testGeneratorWithThreeInputsAndErrors() throws Exception {
    Path apiVersionsXml1 =
        writeApiXmlWithObject(
            "api-versions-1.xml",
            "  <class name=\"android/Foo\" since=\"30\">",
            "    <extends name=\"java/lang/Object\"/>",
            "    <method name=\"bar()V\" since=\"33\"/>",
            "  </class>");

    Path apiVersionsXml2 =
        writeApiXml(
            "api-versions-2.xml",
            "  <class name=\"android/Foo\" since=\"30\">",
            "    <extends name=\"java/lang/Object\"/>",
            "    <method name=\"baz()V\" since=\"32\"/>",
            "  </class>");

    Path apiVersionsXml3 =
        writeApiXml(
            "api-versions-3.xml",
            "  <class name=\"android/Foo\" since=\"30\">",
            "    <extends name=\"java/lang/Object\"/>",
            "    <method name=\"bar()V\" since=\"33\"/>",
            "  </class>");
    Path dummyJar =
        writeJar(
            "dummy.jar",
            new JarClassBuilder("android/Foo", "java/lang/Object")
                .addMethod("bar()V")
                .addMethod("baz()V"));

    Path outputDb = temp.newFile("api_database.ser").toPath();

    TestDiagnosticMessagesImpl diagnosticsHandler = new TestDiagnosticMessagesImpl();
    ApiDatabaseGeneratorCommand command =
        ApiDatabaseGeneratorCommand.builder(diagnosticsHandler)
            .addInputPath(apiVersionsXml1)
            .addInputPath(apiVersionsXml2)
            .addInputPath(apiVersionsXml3)
            .addInputPath(dummyJar)
            .setOutputPath(outputDb)
            .build();

    try {
      ApiDatabaseGenerator.run(command);
      fail("Expected API database generation to fail due to duplicate entries");
    } catch (ApiDatabaseGeneratorException e) {
      // Expected.
    }

    diagnosticsHandler.assertErrorsMatch(
        diagnosticMessage(equalTo("Duplicate class android.Foo found when merging .xml files.")),
        diagnosticMessage(equalTo("Duplicate class android.Foo found when merging .xml files.")));
  }

  @Test
  public void testGeneratorWithMergeAndSuppressedWarnings() throws Exception {
    Path apiVersionsXml1 =
        writeApiXmlWithObject(
            "api-versions-1.xml",
            "  <class name=\"android/Foo\" since=\"30\">",
            "    <extends name=\"java/lang/Object\"/>",
            "    <method name=\"bar()V\" since=\"30\"/>",
            "  </class>");

    Path apiVersionsXml2 =
        writeApiXml(
            "api-versions-2.xml",
            "  <class name=\"android/Foo\" since=\"30\">",
            "    <extends name=\"java/lang/Object\"/>",
            "    <method name=\"bar()V\" since=\"30\"/>",
            "    <field name=\"baz\" since=\"33\"/>",
            "  </class>");
    Path dummyJar =
        writeJar(
            "dummy.jar",
            new JarClassBuilder("android/Foo", "java/lang/Object")
                .addMethod("bar()V")
                .addField("baz"));

    Path outputDb = temp.newFile("api_database.ser").toPath();

    TestDiagnosticMessagesImpl diagnosticsHandler = new TestDiagnosticMessagesImpl();
    String[] args = {
      "--output",
      outputDb.toString(),
      "--map-diagnostics:DuplicateApiDatabaseEntryDiagnostic",
      "error",
      "info",
      apiVersionsXml1.toString(),
      apiVersionsXml2.toString(),
      dummyJar.toString()
    };

    ApiDatabaseGeneratorCommand command =
        ApiDatabaseGeneratorCommand.parse(args, CommandLineOrigin.INSTANCE, diagnosticsHandler)
            .build();

    ApiDatabaseGenerator.run(command);

    assertTrue(Files.exists(outputDb));
    assertTrue(Files.size(outputDb) > 0);

    // Errors and Warnings should be empty because they were mapped to info.
    diagnosticsHandler
        .assertNoErrors()
        .assertNoWarnings()
        // Instead, they should be in the info list.
        .assertInfosMatch(diagnosticMessage(containsString("Duplicate class android.Foo")));
  }

  @Test
  public void testGeneratorWithMergeAndNoneWarnings() throws Exception {
    Path apiVersionsXml1 =
        writeApiXmlWithObject(
            "api-versions-1.xml",
            "  <class name=\"android/Foo\" since=\"30\">",
            "    <extends name=\"java/lang/Object\"/>",
            "    <method name=\"bar()V\" since=\"30\"/>",
            "  </class>");

    Path apiVersionsXml2 =
        writeApiXml(
            "api-versions-2.xml",
            "  <class name=\"android/Foo\" since=\"30\">",
            "    <extends name=\"java/lang/Object\"/>",
            "    <method name=\"bar()V\" since=\"30\"/>",
            "    <field name=\"baz\" since=\"33\"/>",
            "  </class>");
    Path dummyJar =
        writeJar(
            "dummy.jar",
            new JarClassBuilder("android/Foo", "java/lang/Object")
                .addMethod("bar()V")
                .addField("baz"));

    Path outputDb = temp.newFile("api_database.ser").toPath();

    TestDiagnosticMessagesImpl diagnosticsHandler = new TestDiagnosticMessagesImpl();
    String[] args = {
      "--output",
      outputDb.toString(),
      "--map-diagnostics:DuplicateApiDatabaseEntryDiagnostic",
      "error",
      "none",
      apiVersionsXml1.toString(),
      apiVersionsXml2.toString(),
      dummyJar.toString()
    };

    ApiDatabaseGeneratorCommand command =
        ApiDatabaseGeneratorCommand.parse(args, CommandLineOrigin.INSTANCE, diagnosticsHandler)
            .build();

    ApiDatabaseGenerator.run(command);

    assertTrue(Files.exists(outputDb));
    assertTrue(Files.size(outputDb) > 0);

    // Errors, Warnings, and Infos should all be empty because they were mapped to none.
    diagnosticsHandler.assertNoMessages();
  }

  @Test
  public void testJarAndXmlInputs() throws Exception {
    Path xmlFile = temp.newFile("api-versions.xml").toPath();
    Path jarFile = temp.newFile("android.jar").toPath();

    ApiDatabaseGeneratorCommand command =
        ApiDatabaseGeneratorCommand.builder().addInputPath(xmlFile).addInputPath(jarFile).build();

    assertEquals(1, command.getXmlPaths().size());
    assertEquals(xmlFile, command.getXmlPaths().get(0));
    assertEquals(1, command.getJarPaths().size());
    assertEquals(jarFile, command.getJarPaths().get(0));
  }

  @Test
  public void testInvalidInputExtension() throws Exception {
    Path txtFile = temp.newFile("invalid.txt").toPath();

    TestDiagnosticMessagesImpl diagnosticsHandler = new TestDiagnosticMessagesImpl();
    try {
      ApiDatabaseGeneratorCommand.builder(diagnosticsHandler).addInputPath(txtFile).build();
      fail("Expected Command to fail building due to invalid input extension");
    } catch (ApiDatabaseGeneratorException e) {
      // Expected.
    }

    diagnosticsHandler.assertErrorsMatch(
        diagnosticMessage(containsString("Unsupported input file extension")),
        diagnosticMessage(containsString("At least one SDK JAR")),
        diagnosticMessage(containsString("At least one API XML")));
  }

  private Path writeApiXml(String filename, String... contentLines) throws Exception {
    Path file = temp.newFile(filename).toPath();
    String xml =
        StringUtils.lines(
            "<?xml version=\"1.0\" encoding=\"utf-8\"?>",
            "<api version=\"3\">",
            StringUtils.joinLines(contentLines),
            "</api>");
    FileUtils.writeTextFile(file, xml);
    return file;
  }

  private Path writeApiXmlWithObject(String filename, String... contentLines) throws Exception {
    String[] newContentLines = new String[contentLines.length + 3];
    // Only the class definition is needed for tests, not the class members.
    newContentLines[0] = "  <class name=\"java/lang/Object\" since=\"1\">";
    newContentLines[1] = "    <method name=\"&lt;init&gt;()V\"/>";
    newContentLines[2] = "  </class>";
    System.arraycopy(contentLines, 0, newContentLines, 3, contentLines.length);
    return writeApiXml(filename, newContentLines);
  }

  private Path writeJar(String filename, JarClassBuilder... classes) throws Exception {
    Path file = temp.newFile(filename).toPath();
    try (ZipOutputStream out = new ZipOutputStream(Files.newOutputStream(file.toFile().toPath()))) {
      boolean hasObject = false;
      for (JarClassBuilder clazz : classes) {
        if (clazz.name.equals("java/lang/Object")) {
          hasObject = true;
        }
        clazz.write(out);
      }
      if (!hasObject) {
        new JarClassBuilder("java/lang/Object", null).write(out);
      }
    }
    return file;
  }

  public static class JarClassBuilder {
    private final String name;
    private final String superName;
    private final List<String> methods = new ArrayList<>();
    private final List<String> fields = new ArrayList<>();

    public JarClassBuilder(String name, String superName) {
      this.name = name;
      this.superName = superName;
    }

    public JarClassBuilder addMethod(String method) {
      methods.add(method);
      return this;
    }

    public JarClassBuilder addField(String field) {
      fields.add(field);
      return this;
    }

    void write(ZipOutputStream out) throws IOException {
      ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);
      cw.visit(Opcodes.V1_8, Opcodes.ACC_PUBLIC, name, null, superName, null);

      if (superName != null) {
        MethodVisitor mv = cw.visitMethod(Opcodes.ACC_PUBLIC, "<init>", "()V", null, null);
        mv.visitCode();
        mv.visitVarInsn(Opcodes.ALOAD, 0);
        mv.visitMethodInsn(Opcodes.INVOKESPECIAL, superName, "<init>", "()V", false);
        mv.visitInsn(Opcodes.RETURN);
        mv.visitMaxs(0, 0);
        mv.visitEnd();
      } else if (name.equals("java/lang/Object")) {
        MethodVisitor mv = cw.visitMethod(Opcodes.ACC_PUBLIC, "<init>", "()V", null, null);
        mv.visitCode();
        mv.visitInsn(Opcodes.RETURN);
        mv.visitMaxs(0, 0);
        mv.visitEnd();
      }

      for (String method : methods) {
        int index = method.indexOf('(');
        String methodName = method.substring(0, index);
        String methodDesc = method.substring(index);
        MethodVisitor mv = cw.visitMethod(Opcodes.ACC_PUBLIC, methodName, methodDesc, null, null);
        mv.visitCode();
        mv.visitInsn(Opcodes.RETURN);
        mv.visitMaxs(0, 0);
        mv.visitEnd();
      }

      for (String field : fields) {
        cw.visitField(Opcodes.ACC_PUBLIC, field, "Ljava/lang/Object;", null, null).visitEnd();
      }

      cw.visitEnd();
      out.putNextEntry(new ZipEntry(name + ".class"));
      out.write(cw.toByteArray());
      out.closeEntry();
    }
  }
}