/*
 * Copyright (c) 2019, 2026, Oracle and/or its affiliates. All rights reserved.
 * Copyright (c) 2019, Twitter, Inc.
 * 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.
 *
 */

package gc.metaspace;

import jdk.test.lib.Platform;
import jdk.test.lib.process.ProcessTools;
import jdk.test.lib.process.OutputAnalyzer;
import java.util.ArrayList;
import java.util.List;

/* @test TestSizeTransitionsSerial
 * @requires vm.gc.Serial
 * @summary Tests that the metaspace size transition logging is done correctly.
 * @library /test/lib
 * @run driver gc.metaspace.TestSizeTransitions -XX:+UseSerialGC
 */

/* @test TestSizeTransitionsParallel
 * @requires vm.gc.Parallel
 * @summary Tests that the metaspace size transition logging is done correctly.
 * @library /test/lib
 * @run driver gc.metaspace.TestSizeTransitions -XX:+UseParallelGC
 */

/* @test TestSizeTransitionsG1
 * @requires vm.gc.G1
 * @summary Tests that the metaspace size transition logging is done correctly.
 * @library /test/lib
 * @run driver gc.metaspace.TestSizeTransitions -XX:+UseG1GC
 */

public class TestSizeTransitions {
  public static class Run {
    public static void main(String... args) throws Exception {
      System.out.println("Run started.");

      // easiest way to generate a metaspace transition is to ask for a full GC
      System.gc();

      System.out.println("Run finished.");
    }
  }

  // matches the log tags
  //   e.g., [0.043s][info][gc]
  private static final String LOG_TAGS_REGEX = "(\\[.*\\])+ ";

  // matches a size transition
  //   e.g., 177K(4864K)->177K(4864K)
  private static final String SIZE_TRANSITION_REGEX = "\\d+K\\(\\d+K\\)->\\d+K\\(\\d+K\\)";

  // matches -coops metaspace size transitions
  private static final String WITHOUT_CLASS_SPACE_REGEX =
    String.format("^%s.* Metaspace: %s$",
                  LOG_TAGS_REGEX,
                  SIZE_TRANSITION_REGEX);

  // matches +coops metaspace size transitions
  private static final String WITH_CLASS_SPACE_REGEX =
    String.format("^%s.* Metaspace: %s NonClass: %s Class: %s$",
                  LOG_TAGS_REGEX,
                  SIZE_TRANSITION_REGEX,
                  SIZE_TRANSITION_REGEX,
                  SIZE_TRANSITION_REGEX);

  public static void main(String... args) throws Exception {
    if (args.length == 0) {
      throw new RuntimeException("expected jvm args: " + args.length);
    }

    List<String> jvmArgs = new ArrayList<>(List.of(args));
    jvmArgs.add("-Xmx256m");
    jvmArgs.add("-Xlog:gc,gc+metaspace=info");
    jvmArgs.add(TestSizeTransitions.Run.class.getName());

    System.out.println("JVM args:");
    for (String a : jvmArgs) {
      System.out.println("  " + a);
    }

    final OutputAnalyzer output = ProcessTools.executeLimitedTestJava(jvmArgs);
    System.out.println(output.getStdout());
    output.shouldHaveExitValue(0);

    // 32-bit uses narrow Pointers but no class space
    final boolean hasClassSpace = Platform.is64bit();
    if (hasClassSpace) {
      output.stdoutShouldMatch(WITH_CLASS_SPACE_REGEX);
      output.stdoutShouldNotMatch(WITHOUT_CLASS_SPACE_REGEX);
    } else {
      output.stdoutShouldMatch(WITHOUT_CLASS_SPACE_REGEX);
      output.stdoutShouldNotMatch(WITH_CLASS_SPACE_REGEX);
    }
  }
}
