jdk-24/hotspot/test/runtime/SharedArchiveFile/SharedSymbolTableBucketSize.java

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/*
 * @test
 * @bug 8059510
 * @summary Test SharedSymbolTableBucketSize option
 * @library /testlibrary
 * @modules java.base/sun.misc
 *          java.management
 */

import jdk.test.lib.*;

public class SharedSymbolTableBucketSize {
    public static void main(String[] args) throws Exception {
        int bucket_size = 8;
        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
            "-Xshare:dump", "-XX:+PrintSharedSpaces",
            "-XX:+UnlockDiagnosticVMOptions",
            "-XX:SharedArchiveFile=./SharedSymbolTableBucketSize.jsa",
            "-XX:SharedSymbolTableBucketSize=" + Integer.valueOf(bucket_size));
        OutputAnalyzer output = new OutputAnalyzer(pb.start());
        output.shouldContain("Loading classes to share");
        output.shouldHaveExitValue(0);

        String s = output.firstMatch("Average bucket size     : .*");
        Float f = Float.parseFloat(s.substring(25));
        int size = Math.round(f);
        if (size != bucket_size) {
          throw new Exception("FAILED: incorrect bucket size " + size +
                              ", expect " + bucket_size);
        }


        // Invalid SharedSymbolTableBucketSize input
        String input[] = {"-XX:SharedSymbolTableBucketSize=-1",
                          "-XX:SharedSymbolTableBucketSize=2.5"};
        for (int i = 0; i < input.length; i++) {
          pb = ProcessTools.createJavaProcessBuilder(
               "-Xshare:dump", "-XX:+PrintSharedSpaces",
               "-XX:+UnlockDiagnosticVMOptions",
               "-XX:SharedArchiveFile=./SharedSymbolTableBucketSize.jsa",
               input[i]);
          output = new OutputAnalyzer(pb.start());
          output.shouldContain("Improperly specified VM option");
      }
  }
}