When building hotspot on linuxx86_64/gcc with LTO enabled (--enable-jvm-feature-link-time-opt), we get various test errors in the serviceability/sa area. Example serviceability/sa/CDSJMapClstats.java
finding class loader instances ..java.lang.InternalError: Metadata does not appear to be polymorphic at jdk.hotspot.agent/sun.jvm.hotspot.types.basic.BasicTypeDataBase.findDynamicTypeForAddress(BasicTypeDataBase.java:223) at jdk.hotspot.agent/sun.jvm.hotspot.runtime.VirtualBaseConstructor.instantiateWrapperFor(VirtualBaseConstructor.java:104) at jdk.hotspot.agent/sun.jvm.hotspot.oops.Metadata.instantiateWrapperFor(Metadata.java:77) at jdk.hotspot.agent/sun.jvm.hotspot.memory.SystemDictionary.getClassLoaderKlass(SystemDictionary.java:102) at jdk.hotspot.agent/sun.jvm.hotspot.tools.ClassLoaderStats.printClassLoaderStatistics(ClassLoaderStats.java:93) at jdk.hotspot.agent/sun.jvm.hotspot.tools.ClassLoaderStats.run(ClassLoaderStats.java:78) at jdk.hotspot.agent/sun.jvm.hotspot.tools.JMap.run(JMap.java:121) at jdk.hotspot.agent/sun.jvm.hotspot.tools.Tool.startInternal(Tool.java:278) at jdk.hotspot.agent/sun.jvm.hotspot.tools.Tool.start(Tool.java:241) at jdk.hotspot.agent/sun.jvm.hotspot.tools.Tool.execute(Tool.java:134) at jdk.hotspot.agent/sun.jvm.hotspot.tools.JMap.main(JMap.java:202) at jdk.hotspot.agent/sun.jvm.hotspot.SALauncher.runJMAP(SALauncher.java:344) at jdk.hotspot.agent/sun.jvm.hotspot.SALauncher.main(SALauncher.java:507) Seems we have to avoid elimination of the Metadata vtable ; this can be achieved by linker flags or by modifying class Metadata. --------- - [x] I confirm that I make this contribution in accordance with the [OpenJDK Interim AI Policy](https://openjdk.org/legal/ai). ------------- Commit messages: - JDK-8382338 Changes: https://git.openjdk.org/jdk/pull/30771/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=30771&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8382338 Stats: 12 lines in 3 files changed: 11 ins; 0 del; 1 mod Patch: https://git.openjdk.org/jdk/pull/30771.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/30771/head:pull/30771 PR: https://git.openjdk.org/jdk/pull/30771
