RFR: 8264644: More complete ClassLoaderData for cld->print()

Fri Apr 2 15:03:22 UTC 2021

On Fri, 2 Apr 2021 14:40:25 GMT, Yi Yang <yyang at openjdk.org> wrote:

>> This looks nice. If you use -XX:+PrintSystemDictionaryAtExit with this change, is it pages and pages long?  Or does it look ok?  Thank you for doing this!
>
> Hi @coleenp, thanks for looking at this, it does outputs too detailed content for klasses(actually that's what I want to see), if you think it is too much detail for most people, I can print detailed content of klasses of CLD only when -XX:+Verbose.
> ...
> ClassLoaderData(0x00007fea483e5a50)
>  - name                'app'
>  - holder              WeakHandle: 0x00000007fef56d98
>  - class loader        0x7fea483e5c08
>  - metaspace           (nil)
>  - unloading           false
>  - class mirror holder false
>  - modified oops       true
>  - keep alive          0
>  - claim               none
>  - handles             20
>  - dependency count    0
>  - klasses             { }
>  - packages            0x7fea483e5df0
>  - module              0x7fea483ea640
>  - unnamed module      0x7fea483e65a0
>  - dictionary          0x7fea483e6640
>  - deallocate list     (nil)
> ClassLoaderData(0x00007fea482ee640)
>  - name                'platform'
>  - holder              WeakHandle: 0x00000007fef56678
>  - class loader        0x7fea482ee7f8
>  - metaspace           (nil)
>  - unloading           false
>  - class mirror holder false
>  - modified oops       true
>  - keep alive          0
>  - claim               none
>  - handles             24
>  - dependency count    0
>  - klasses             { }
>  - packages            0x7fea482eebf0
>  - module              0x7fea482ef4f0
>  - unnamed module      0x7fea482ef3a0
>  - dictionary          0x7fea482ef440
>  - deallocate list     (nil)
> ClassLoaderData(0x00007fea482e01f0)
>  - name                'bootstrap'
>  - class loader        (nil)
>  - metaspace           0x7fea48391b60
>  - unloading           false
>  - class mirror holder false
>  - modified oops       true
>  - keep alive          1
>  - claim               none
>  - handles             668
>  - dependency count    0
>  - klasses             {java.lang.Shutdown$Lock,java.lang.Shutdown,[Ljava.nio.charset.CoderResult;,java.nio.charset.CoderResult,java.nio.HeapCharBuffer,java.nio.CharBuffer,java.lang.Readable,java.lang.invoke.StringConcatFactory$3,java.lang.invoke.StringConcatFactory$2,java.lang.invoke.StringConcatFactory$1,java.lang.invoke.StringConcatFactory,jdk.internal.util.Preconditions,sun.net.util.IPAddressUtil,sun.net.www.protocol.file.Handler,java.net.URLStreamHandler,java.util.HexFormat,sun.net.www.ParseUtil,[Ljava.io.File$PathStatus;,java.io.File$PathStatus,java.net.URL$3,jdk.internal.access.JavaNetURLAccess,java.net.URL$DefaultFactory,java.net.URLStreamHandlerFactory,jdk.internal.loader.URLClassPath,jdk.internal.loader.BootLoader,java.util.ArrayDeque,java.util.Deque,java.util.Queue,jdk.internal.loader.NativeLibraries$2,jdk.internal.loader.NativeLibraries$NativeLibraryImpl,jdk.internal.loader.NativeLibrary,java.security.ProtectionDomain$JavaSecurityAccessImpl,jdk.internal.access.JavaSecur
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>  - packages            0x7fea482e03a0
>  - module              0x7fea482e5030
>  - unnamed module      0x7fea482e0b50
>  - dictionary          0x7fea482e0bf0
>  - jmethod count       3
>  - deallocate list     (nil)

I was just using PrintSystemDictionaryAtExit and wanted to ignore the CLDG information, which is already quite verbose for this option, so there was a lot of scrolling.

It's sort of a small change to add a nonproduct PrintClassLoaderDataGraphAtExit and use that to print the CLDG at exit and remove it from PrintSystemDictionaryAtExit.  Then we can each get the info we want.

-------------

PR: https://git.openjdk.java.net/jdk/pull/3323