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 * version 2 for more details (a copy is included in the LICENSE file that
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 * 2 along with this work; if not, write to the Free Software Foundation,
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/**
 * @test
 * @bug 8159262
 * @summary layers over the boot layer are repeatedly created, during this iteration, GCs are forced to verify correct walk of module and package lists.
 * @modules java.base/jdk.internal.misc
 * @library /test/lib
 * @compile ../CompilerUtils.java
 * @run main/othervm ModuleStressGC
 */

import java.nio.file.Path;
import java.nio.file.Paths;
import jdk.test.lib.process.ProcessTools;
import jdk.test.lib.process.OutputAnalyzer;

public class ModuleStressGC {

    private static final String TEST_SRC = System.getProperty("test.src");
    private static final String TEST_CLASSES = System.getProperty("test.classes");

    private static final Path SRC_DIR = Paths.get(TEST_SRC, "src");
    private static final Path MODS_DIR = Paths.get(TEST_CLASSES, "mods");

    /**
     * Compile two module definitions used by the test, jdk.test and jdk.translet.
     */
    public static void main(String[] args) throws Exception {

        boolean compiled;
        // Compile module jdk.test declaration
        compiled = CompilerUtils.compile(
            SRC_DIR.resolve("jdk.test"),
            MODS_DIR.resolve("jdk.test"));
        if (!compiled) {
            throw new RuntimeException("Test failed to compile module jdk.test");
        }

        // Compile module jdk.translet declaration
        compiled = CompilerUtils.compile(
            SRC_DIR.resolve("jdk.translet"),
            MODS_DIR.resolve("jdk.translet"),
            "--add-exports=jdk.test/test=jdk.translet",
            "-p", MODS_DIR.toString());
        if (!compiled) {
            throw new RuntimeException("Test failed to compile module jdk.translet");
        }

        // Sanity check that the test, jdk.test/test/MainGC.java,
        // correctly walks module jdk.test's reads list and package
        // test's, defined to module jdk.translet, export list at
        // GC safepoints.
        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
            "-Xlog:module=trace",
            "-p", MODS_DIR.toString(),
            "-m", "jdk.test/test.MainGC");
        OutputAnalyzer oa = new OutputAnalyzer(pb.start());
        oa.shouldContain("package test defined in module jdk.test, exports list being walked")
          .shouldContain("module jdk.test reads list being walked")
          .shouldHaveExitValue(0);
    }
}