src/test/java/com/android/tools/r8/debug/JasminDebugTest.java

// Copyright (c) 2017, 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.debug;

import com.android.tools.r8.ToolHelper;
import com.android.tools.r8.jasmin.JasminBuilder;
import com.android.tools.r8.jasmin.JasminBuilder.ClassBuilder;
import com.google.common.collect.ImmutableList;
import jasmin.ClassFile;
import java.io.File;
import java.io.OutputStream;
import java.io.StringReader;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.List;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.TemporaryFolder;

// TODO(b/65474850) Should we build Jasmin at compile time or runtime ?
public class JasminDebugTest extends DebugTestBase {

  public static final boolean RUN_JAVA = false;

  @Rule
  public TemporaryFolder temp = ToolHelper.getTemporaryFolderForTest();

  @Test
  public void testUselessCheckcast() throws Throwable {
    final String className = "UselessCheckCast";
    final String sourcefile = className + ".j";
    final String methodName = "test";
    List<Path> paths = getExtraPaths(getBuilderForUselessCheckcast(className, methodName));
    runDebugTest(
        getDebuggeeDexD8OrCf(RUN_JAVA),
        paths,
        className,
        breakpoint(className, methodName),
        run(),
        checkLine(sourcefile, 1),
        stepOver(),
        checkLine(sourcefile, 2),
        checkLocal("local"),
        stepOver(),
        checkLine(sourcefile, 3),
        checkNoLocal("local"),
        stepOver(),
        checkLine(sourcefile, 4),
        run());
  }

  private JasminBuilder getBuilderForUselessCheckcast(String testClassName, String testMethodName) {
    JasminBuilder builder = new JasminBuilder();
    JasminBuilder.ClassBuilder clazz = builder.addClass(testClassName);

    clazz.addStaticMethod(testMethodName, ImmutableList.of("Ljava/lang/Object;"), "V",
        ".limit stack 1",
        ".limit locals 3",
        ".var 1 is local Ljava/lang/Object; from Label1 to Label2",
        ".line 1",
        " aload 0",
        " dup",
        " astore 1",
        " Label1:",
        ".line 2",
        " checkcast " + testClassName,
        " Label2:",
        ".line 3",
        " checkcast " + testClassName,
        ".line 4",
        "return");

    clazz.addMainMethod(
        ".limit stack 2",
        ".limit locals 1",
        "aconst_null",
        "invokestatic " + testClassName + "/" + testMethodName + "(Ljava/lang/Object;)V",
        "return");

    return builder;
  }

  private List<Path> getExtraPaths(JasminBuilder builder) throws Exception {
    ImmutableList<ClassBuilder> classes = builder.getClasses();
    List<Path> extraPaths = new ArrayList<>(classes.size());
    File out = temp.newFolder();

    for (ClassBuilder clazz : classes) {
      ClassFile file = new ClassFile();
      file.readJasmin(new StringReader(clazz.toString()), clazz.name, false);
      Path path = out.toPath().resolve(clazz.name + ".class");
      Files.createDirectories(path.getParent());
      try (OutputStream outputStream = Files.newOutputStream(path)) {
        file.write(outputStream);
      }
      if (RUN_JAVA) {
        extraPaths.add(path);
      } else {
        extraPaths.add(compileToDex(path, null));
      }
    }

    return extraPaths;
  }
}