JDK-8252464 : Convert SystemDictionary::WKID to enum class
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: runtime
  • Affected Version: 16
  • Priority: P4
  • Status: Resolved
  • Resolution: Duplicate
  • Submitted: 2020-08-27
  • Updated: 2021-09-14
  • Resolved: 2021-09-14
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JDK 17
17Resolved
Related Reports
Duplicate :  
JDK-8260467 - Move well-known classes from systemDictionary.hpp to vmClasses.hpp
Relates :  
JDK-8247938 - Change various JVM enums like LinkInfo::AccessCheck and Klass::DefaultsLookupMode to enum class
Description
Convert SystemDictionary::WKID to enum class to provide better type safety. Also implement proper enumerators for this type of enums to avoid code like this (which might get out of bounds if you're not careful):

void SystemDictionary::well_known_klasses_do(MetaspaceClosure* it) {
  for (int id = FIRST_WKID; id < WKID_LIMIT; id++) {
    it->push(well_known_klass_addr((WKID)id));
  }
}
Comments
This was fixed in JDK-8260467 in JDK 17.
14-09-2021