/*

 * Copyright (c) 2014, 2019, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

/*

 * @test

 * @summary classes with major version < JDK_6 (50) should not be included in CDS

 * @requires vm.cds

 * @library /test/lib

 * @modules java.base/jdk.internal.org.objectweb.asm

 *          jdk.jartool/sun.tools.jar

 * @compile test-classes/Hello.java

 * @run build TestCommon JarBuilder

 * @run driver OldClassTest

 */

import java.io.File;

import java.io.FileOutputStream;

import jdk.test.lib.process.OutputAnalyzer;

import java.nio.file.Files;

import java.util.*;

import jdk.internal.org.objectweb.asm.*;

public class OldClassTest implements Opcodes {

  public static void main(String[] args) throws Exception {

    File jarSrcFile = new File(JarBuilder.getOrCreateHelloJar());

    File dir = new File(System.getProperty("test.classes", "."));

    File jarFile = new File(dir, "OldClassTest_old.jar");

    String jar = jarFile.getPath();

    if (!jarFile.exists() || jarFile.lastModified() < jarSrcFile.lastModified()) {

      createTestJarFile(jarSrcFile, jarFile);

    } else {

      System.out.println("Already up-to-date: " + jarFile);

    }

    String appClasses[] = TestCommon.list("Hello");

    // CASE 1: pre-JDK 6 compiled classes should be excluded from the dump

    OutputAnalyzer output = TestCommon.dump(jar, appClasses);

    TestCommon.checkExecReturn(output, 0, true, "Pre JDK 6 class not supported by CDS");

    TestCommon.run(

        "-cp", jar,

        "Hello")

      .assertNormalExit("Hello Unicode world (Old)");

    // CASE 2: if we exlcude old version of this class, we should not pick up

    //         the newer version of this class in a subsequent classpath element.

    String classpath = jar + File.pathSeparator + jarSrcFile.getPath();

    output = TestCommon.dump(classpath, appClasses);

    TestCommon.checkExecReturn(output, 0, true, "Pre JDK 6 class not supported by CDS");

    TestCommon.run(

        "-cp", classpath,

        "Hello")

      .assertNormalExit("Hello Unicode world (Old)");

  }

  static void createTestJarFile(File jarSrcFile, File jarFile) throws Exception {

    jarFile.delete();

    Files.copy(jarSrcFile.toPath(), jarFile.toPath());

    File dir = new File(System.getProperty("test.classes", "."));

    File outdir = new File(dir, "old_class_test_classes");

    outdir.delete();

    outdir.mkdir();

    writeClassFile(new File(outdir, "Hello.class"), makeOldHello());

    JarBuilder.update(jarFile.getPath(), outdir.getPath());

  }

  static void writeClassFile(File file, byte bytecodes[]) throws Exception {

    try (FileOutputStream fos = new FileOutputStream(file)) {

        fos.write(bytecodes);

      }

  }

/* makeOldHello() was obtained using JDK8. We use a method name > 128 that would

   trigger a call to java.lang.Character.isJavaIdentifierStart() during class

   file parsing.

cat > Hello.java <<EOF

public class Hello {

    public static void main(String args[]) {

        System.out.println(\u1234());

    }

    static String \u1234() {

        return "Hello Unicode world (Old)";

    }

}

EOF

javac Hello.java

java jdk.internal.org.objectweb.asm.util.ASMifier Hello.class

 */

  static byte[] makeOldHello() throws Exception {

    ClassWriter cw = new ClassWriter(0);

    FieldVisitor fv;

    MethodVisitor mv;

    AnnotationVisitor av0;

      cw.visit(V1_5, ACC_PUBLIC + ACC_SUPER, "Hello", null, "java/lang/Object", null);

    {

      mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);

      mv.visitCode();

      mv.visitVarInsn(ALOAD, 0);

      mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false);

      mv.visitInsn(RETURN);

      mv.visitMaxs(1, 1);

      mv.visitEnd();

    }

    {

      mv = cw.visitMethod(ACC_PUBLIC + ACC_STATIC, "main", "([Ljava/lang/String;)V", null, null);

      mv.visitCode();

      mv.visitFieldInsn(GETSTATIC, "java/lang/System", "out", "Ljava/io/PrintStream;");

      mv.visitMethodInsn(INVOKESTATIC, "Hello", "\u1234", "()Ljava/lang/String;", false);

      mv.visitMethodInsn(INVOKEVIRTUAL, "java/io/PrintStream", "println", "(Ljava/lang/String;)V", false);

      mv.visitInsn(RETURN);

      mv.visitMaxs(2, 1);

      mv.visitEnd();

    }

    {

      mv = cw.visitMethod(ACC_STATIC, "\u1234", "()Ljava/lang/String;", null, null);

      mv.visitCode();

      mv.visitLdcInsn("Hello Unicode world (Old)");

      mv.visitInsn(ARETURN);

      mv.visitMaxs(1, 0);

      mv.visitEnd();

    }

    cw.visitEnd();

    return cw.toByteArray();

  }

}