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  1. JDK
  2. JDK-8145357

command line flag constraints runs constraint functions too early


    • Type: Bug
    • Status: Resolved
    • Priority: P2
    • Resolution: Not an Issue
    • Affects Version/s: 9
    • Fix Version/s: 9
    • Component/s: hotspot
    • Labels:


      JVMCI uses a constraint function to make sure you can't turn on certain flags without another being turned on:

      Flag::Error EnableJVMCIMustBeEnabledConstraintFunc(bool value, bool verbose) {
        if (!EnableJVMCI) {
          if (verbose == true) {
            jio_fprintf(defaultStream::error_stream(), "EnableJVMCI must be enabled\n");
          return Flag::VIOLATES_CONSTRAINT;
        } else {
          return Flag::SUCCESS;

      But it doesn't work as expected:

      cthaling@macbook:~/ws/jdk9/hs-comp$ ./build/macosx-x86_64-normal-server-release/jdk/bin/java -XX:+UnlockExperimentalVMOptions -XX:-EnableJVMCI -XX:+UseJVMCICompiler
      EnableJVMCI must be enabled
      Improperly specified VM option 'UseJVMCICompiler'
      Error: Could not create the Java Virtual Machine.
      Error: A fatal exception has occurred. Program will exit.

      cthaling@macbook:~/ws/jdk9/hs-comp$ ./build/macosx-x86_64-normal-server-release/jdk/bin/java -XX:+UnlockExperimentalVMOptions -XX:+EnableJVMCI -XX:+UseJVMCICompiler -XX:-EnableJVMCI
      # A fatal error has been detected by the Java Runtime Environment:
      # SIGSEGV (0xb) at pc=0x0000000110218778, pid=92084, tid=5891
      # JRE version: Java(TM) SE Runtime Environment (9.0) (build 9-internal+0-2015-12-08-103439.cthaling.hs-comp)
      # Java VM: Java HotSpot(TM) 64-Bit Server VM (9-internal+0-2015-12-08-103439.cthaling.hs-comp, mixed mode, tiered, jvmci compiler, compressed oops, g1 gc, bsd-amd64)
      # Problematic frame:
      # V [libjvm.dylib+0x218778]
      # No core dump will be written. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
      # An error report file with more information is saved as:
      # /Users/cthaling/ws/jdk9/hs-comp/hs_err_pid92084.log
      # If you would like to submit a bug report, please visit:
      # http://bugreport.java.com/bugreport/crash.jsp
      Abort trap: 6


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              • Assignee:
                twisti Christian Thalinger
                twisti Christian Thalinger
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