openjdk/test/hotspot/jtreg/compiler/codecache/CodeCacheSegmentSizeTest.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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/*
 * @test
 * @bug 8358694
 * @summary Verifies that setting CodeCacheSegmentSize to a non-power-of-two value does not crash the JVM and shows expected error.
 * @library /test/lib
 * @run driver CodeCacheSegmentSizeTest
 */

import jdk.test.lib.Platform;
import jdk.test.lib.process.ProcessTools;
import jdk.test.lib.process.OutputAnalyzer;

public class CodeCacheSegmentSizeTest {
    public static void main(String[] args) throws Exception {
        String codeCacheSegmentSize = (Platform.isS390x() ? "67" : "36"); // invalid value (not power of two)
        ProcessBuilder pb = ProcessTools.createLimitedTestJavaProcessBuilder(
            "-XX:+UnlockExperimentalVMOptions",
            "-XX:CodeCacheSegmentSize=" + codeCacheSegmentSize,
            "-version"
        );

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

        // Ensure no crash (no assert failure)
        output.shouldNotContain("assert");

        // Expected graceful error output
        output.shouldContain("CodeCacheSegmentSize (" + codeCacheSegmentSize + ") must be a power of two");
        output.shouldContain("Error: Could not create the Java Virtual Machine.");
        output.shouldContain("Error: A fatal exception has occurred. Program will exit.");

        // Graceful exit with error code 1
        output.shouldHaveExitValue(1);
    }
}