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

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/*

 * @test

 * @bug 8198908

 * @summary Check that preview minor version and --enable-preview are handled

 *          correctly.

 * @modules java.base/jdk.internal.misc

 * @library /test/lib

 * @run main PreviewVersion

 */

import java.io.File;

import jdk.test.lib.compiler.InMemoryJavaCompiler;

import jdk.test.lib.ByteCodeLoader;

import jdk.test.lib.process.OutputAnalyzer;

import jdk.test.lib.process.ProcessTools;

public class PreviewVersion {

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

        System.out.println("Regression test for bug 8198908");

        byte klassbuf[] = InMemoryJavaCompiler.compile("PVTest",

            "public class PVTest { " +

                "public static void main(String argv[]) { " +

                    "System.out.println(\"Hi!\"); } }");

        // Set class's minor version to 65535.

        klassbuf[4] = -1;

        klassbuf[5] = -1;

        // Run the test. This should fail because --enable-preview is not specified.

        ClassFileInstaller.writeClassToDisk("PVTest", klassbuf, System.getProperty("test.classes"));

        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(

            "-cp", "." + File.pathSeparator + System.getProperty("test.classes"), "PVTest");

        OutputAnalyzer oa = new OutputAnalyzer(pb.start());

        oa.shouldContain("Preview features are not enabled");

        oa.shouldHaveExitValue(1);

        // This should be successful because --enable-preview is specified.

        pb = ProcessTools.createJavaProcessBuilder("--enable-preview",

            "-cp", "." + File.pathSeparator + System.getProperty("test.classes"), "PVTest");

        oa = new OutputAnalyzer(pb.start());

        oa.shouldContain("Hi!");

        // Test -Xlog:class+preview

        pb = ProcessTools.createJavaProcessBuilder("--enable-preview", "-Xlog:class+preview",

            "-cp", "." + File.pathSeparator + System.getProperty("test.classes"), "PVTest");

        oa = new OutputAnalyzer(pb.start());

        oa.shouldContain("[info][class,preview] Loading preview feature type PVTest");

        // Subtract 1 from class's major version.  The class should fail to load

        // because its major_version does not match the JVM current version.

        int prev_major_version = Runtime.version().feature() - 1;

        klassbuf[6] = (byte)((prev_major_version >> 8) & 0xff);

        klassbuf[7] = (byte)(prev_major_version & 0xff);

        try {

            ByteCodeLoader.load("PVTest", klassbuf);

            throw new RuntimeException("UnsupportedClassVersionError exception not thrown");

        } catch (java.lang.UnsupportedClassVersionError e) {

            if (!e.getMessage().contains("compiled with preview features that are unsupported")) {

                throw new RuntimeException(

                    "Wrong UnsupportedClassVersionError exception: " + e.getMessage());

            }

        }

        // Set class's major version to 45.  The class should load because class

        // version 45.65535 is valid.

        klassbuf[6] = 0;

        klassbuf[7] = 45;

        try {

            ByteCodeLoader.load("PVTest", klassbuf);

        } catch (java.lang.UnsupportedClassVersionError e) {

            throw new RuntimeException(

                "Unexpected UnsupportedClassVersionError exception thrown: " + e.getMessage());

        }

        // Check that a class with a recent older major version and a non-zero

        // minor version fails to load.

        klassbuf[6] = 0;

        klassbuf[7] = 53;

        klassbuf[4] = 0;

        klassbuf[5] = 2;

        try {

            ByteCodeLoader.load("PVTest", klassbuf);

            throw new RuntimeException("UnsupportedClassVersionError exception not thrown");

        } catch (java.lang.UnsupportedClassVersionError e) {

            if (!e.getMessage().contains("was compiled with an invalid non-zero minor version")) {

                throw new RuntimeException(

                    "Wrong UnsupportedClassVersionError exception: " + e.getMessage());

            }

        }

    }

}