jdk-24/hotspot/test/compiler/codecache/CheckSegmentedCodeCache.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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.
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import com.oracle.java.testlibrary.*;

/*
 * @test CheckSegmentedCodeCache
 * @bug 8015774
 * @summary "Checks VM options related to the segmented code cache"
 * @library /testlibrary
 * @run main/othervm CheckSegmentedCodeCache
 */
public class CheckSegmentedCodeCache {
  // Code heap names
  private static final String NON_METHOD = "CodeHeap 'non-nmethods'";
  private static final String PROFILED = "CodeHeap 'profiled nmethods'";
  private static final String NON_PROFILED = "CodeHeap 'non-profiled nmethods'";

  private static void verifySegmentedCodeCache(ProcessBuilder pb, boolean enabled) throws Exception {
    OutputAnalyzer out = new OutputAnalyzer(pb.start());
    out.shouldHaveExitValue(0);
    if (enabled) {
      try {
        // Non-nmethod code heap should be always available with the segmented code cache
        out.shouldContain(NON_METHOD);
      } catch (RuntimeException e) {
        // Check if TieredCompilation is disabled (in a client VM)
        if(!out.getOutput().contains("TieredCompilation is disabled in this release.")) {
          // Code cache is not segmented
          throw new RuntimeException("No code cache segmentation.");
        }
      }
    } else {
      out.shouldNotContain(NON_METHOD);
    }
  }

  private static void verifyCodeHeapNotExists(ProcessBuilder pb, String... heapNames) throws Exception {
    OutputAnalyzer out = new OutputAnalyzer(pb.start());
    out.shouldHaveExitValue(0);
    for (String name : heapNames) {
      out.shouldNotContain(name);
    }
  }

  private static void failsWith(ProcessBuilder pb, String message) throws Exception {
    OutputAnalyzer out = new OutputAnalyzer(pb.start());
    out.shouldContain(message);
    out.shouldHaveExitValue(1);
  }

  /**
   * Check the result of segmented code cache related VM options.
   */
  public static void main(String[] args) throws Exception {
    ProcessBuilder pb;

    // Disabled with ReservedCodeCacheSize < 240MB
    pb = ProcessTools.createJavaProcessBuilder("-XX:ReservedCodeCacheSize=239m",
                                               "-XX:+PrintCodeCache", "-version");
    verifySegmentedCodeCache(pb, false);

    // Disabled without TieredCompilation
    pb = ProcessTools.createJavaProcessBuilder("-XX:-TieredCompilation",
                                               "-XX:+PrintCodeCache", "-version");
    verifySegmentedCodeCache(pb, false);

    // Enabled with TieredCompilation and ReservedCodeCacheSize >= 240MB
    pb = ProcessTools.createJavaProcessBuilder("-XX:+TieredCompilation",
                                               "-XX:ReservedCodeCacheSize=240m",
                                               "-XX:+PrintCodeCache", "-version");
    verifySegmentedCodeCache(pb, true);
    pb = ProcessTools.createJavaProcessBuilder("-XX:+TieredCompilation",
                                               "-XX:ReservedCodeCacheSize=400m",
                                               "-XX:+PrintCodeCache", "-version");
    verifySegmentedCodeCache(pb, true);

    // Always enabled if SegmentedCodeCache is set
    pb = ProcessTools.createJavaProcessBuilder("-XX:+SegmentedCodeCache",
                                               "-XX:-TieredCompilation",
                                               "-XX:ReservedCodeCacheSize=239m",
                                               "-XX:+PrintCodeCache", "-version");
    verifySegmentedCodeCache(pb, true);

    // The profiled and non-profiled code heaps should not be available in
    // interpreter-only mode
    pb = ProcessTools.createJavaProcessBuilder("-XX:+SegmentedCodeCache",
                                               "-Xint",
                                               "-XX:+PrintCodeCache", "-version");
    verifyCodeHeapNotExists(pb, PROFILED, NON_PROFILED);

    // If we stop compilation at CompLevel_none or CompLevel_simple we
    // don't need a profiled code heap.
    pb = ProcessTools.createJavaProcessBuilder("-XX:+SegmentedCodeCache",
                                               "-XX:TieredStopAtLevel=0",
                                               "-XX:+PrintCodeCache", "-version");
    verifyCodeHeapNotExists(pb, PROFILED);
    pb = ProcessTools.createJavaProcessBuilder("-XX:+SegmentedCodeCache",
                                               "-XX:TieredStopAtLevel=1",
                                               "-XX:+PrintCodeCache", "-version");
    verifyCodeHeapNotExists(pb, PROFILED);

    // Fails with too small non-nmethod code heap size
    pb = ProcessTools.createJavaProcessBuilder("-XX:NonNMethodCodeHeapSize=100K");
    failsWith(pb, "Invalid NonNMethodCodeHeapSize");

    // Fails if code heap sizes do not add up
    pb = ProcessTools.createJavaProcessBuilder("-XX:+SegmentedCodeCache",
                                               "-XX:ReservedCodeCacheSize=10M",
                                               "-XX:NonNMethodCodeHeapSize=5M",
                                               "-XX:ProfiledCodeHeapSize=5M",
                                               "-XX:NonProfiledCodeHeapSize=5M");
    failsWith(pb, "Invalid code heap sizes");

    // Fails if not enough space for VM internal code
    pb = ProcessTools.createJavaProcessBuilder("-XX:+SegmentedCodeCache",
                                               "-XX:ReservedCodeCacheSize=1700K",
                                               "-XX:InitialCodeCacheSize=100K");
    failsWith(pb, "Not enough space in non-nmethod code heap to run VM");
  }
}