RFR (S): 8213439: Run class initialization for boot loader classes with registered subgraph archiving entry field during CDS dump time
Jiangli Zhou
jiangli.zhou at oracle.com
Thu Nov 8 01:25:05 UTC 2018
Hi David,
Attached are two logs for class initialization:
init_nodumping: bin/java -Xshare:off
init_cdsumping: bin/java -Xshare:dump
The class initialization orderings are identical for 'bin/java
-Xshare:off' and 'bin/java -Xshare:dump' before the initialization of
sun.launcher.LauncherHelper.
Thanks,
Jiangli
On 11/7/18 4:56 PM, David Holmes wrote:
> Hi Jiangli,
>
> Messing with the established initialization order still rings alarm
> bells for me. Can you generate the normal class initialization list
> for VM startup, and one for a CDS dump, so that we can see how they
> differ. It would very easy for subtle initialization bugs to creep in
> here. (Even with the existing use of Java code during dump time.)
>
> Thanks,
> David
>
> On 8/11/2018 10:45 AM, Jiangli Zhou wrote:
>> Please review following webrev that explicitly runs class
>> initialization for classes (for boot loader only) with registered
>> subgraph archiving entry field(s) during CDS dump time.
>>
>> At CDS dump time, some of the loaded classes are initialized due to
>> execution of java code. Currently there are 279 classes are
>> initialized at dump time. The rest of the loaded classes are not
>> initialized. Running class initialization for the boot classes with
>> registered subgraph archiving entry field(s) will allow those static
>> fields (and their directly/indirectly referenced objects) being
>> populated at CDS dump time and archived. The Long$LongCache (planned
>> for JDK-8213033 by Claes, thanks!) is such an example.
>>
>> webrev: http://cr.openjdk.java.net/~jiangli/8213439/webrev.00/
>>
>> RFE: https://bugs.openjdk.java.net/browse/JDK-8213439
>>
>> The initialization of a class is triggered explicitly when processing
>> the subgraph entry fields at dump time. For any class that's already
>> initialized at this point, it's essentially a nop. That's the case
>> for current existing subgraph entries.
>>
>> Tested with tier1-tier3. Thanks David and Ioi's for discussions in
>> the bug report.
>>
>> Thanks,
>>
>> Jiangli
>>
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Initializing java.lang.invoke.InvokerBytecodeGenerator
Initializing java.lang.invoke.InvokerBytecodeGenerator$2
Initializing java.lang.invoke.CallSite
Initializing java.lang.invoke.BootstrapMethodInvoker
Initializing java.lang.invoke.Invokers
Initializing java.lang.invoke.Invokers$Holder
Initializing java.lang.invoke.MethodHandleImpl
Initializing java.lang.invoke.MethodHandleImpl$1
Initializing java.lang.invoke.AbstractValidatingLambdaMetafactory
Initializing java.lang.invoke.InnerClassLambdaMetafactory
Initializing jdk.internal.org.objectweb.asm.Type
Initializing java.lang.invoke.MethodHandleInfo
Initializing java.lang.invoke.InfoFromMemberName
Initializing sun.invoke.util.BytecodeDescriptor
Initializing jdk.internal.org.objectweb.asm.ClassVisitor
Initializing jdk.internal.org.objectweb.asm.ClassWriter
Initializing jdk.internal.org.objectweb.asm.ByteVector
Initializing jdk.internal.org.objectweb.asm.Item
Initializing jdk.internal.org.objectweb.asm.FieldVisitor
Initializing jdk.internal.org.objectweb.asm.FieldWriter
Initializing jdk.internal.org.objectweb.asm.MethodVisitor
Initializing jdk.internal.org.objectweb.asm.MethodWriter
Initializing jdk.internal.org.objectweb.asm.Label
Initializing jdk.internal.org.objectweb.asm.Frame
Initializing jdk.internal.org.objectweb.asm.AnnotationVisitor
Initializing jdk.internal.org.objectweb.asm.AnnotationWriter
Initializing java.lang.invoke.TypeConvertingMethodAdapter
Initializing java.lang.invoke.InnerClassLambdaMetafactory$ForwardingMethodGenerator
Initializing java.util.ResourceBundle$$Lambda$1/0x0000000800060040
Initializing java.lang.invoke.ConstantCallSite
Initializing java.lang.invoke.MethodHandleNatives$CallSiteContext
Initializing jdk.internal.ref.CleanerFactory
Initializing jdk.internal.ref.CleanerFactory$1
Initializing java.lang.ref.Cleaner
Initializing java.lang.ref.Cleaner$1
Initializing jdk.internal.ref.CleanerImpl
Initializing jdk.internal.ref.PhantomCleanable
Initializing jdk.internal.ref.CleanerImpl$PhantomCleanableRef
Initializing jdk.internal.ref.WeakCleanable
Initializing jdk.internal.ref.CleanerImpl$WeakCleanableRef
Initializing jdk.internal.ref.SoftCleanable
Initializing jdk.internal.ref.CleanerImpl$SoftCleanableRef
Initializing jdk.internal.ref.CleanerImpl$CleanerCleanable
Initializing jdk.internal.ref.CleanerFactory$1$1
Initializing jdk.internal.misc.InnocuousThread
Initializing jdk.internal.misc.InnocuousThread$3
Initializing jdk.internal.misc.InnocuousThread$2
Initializing java.util.ResourceBundle$CacheKey
Initializing java.util.ResourceBundle$KeyElementReference
Initializing java.util.AbstractSequentialList
Initializing java.util.LinkedList
Initializing java.util.LinkedList$Node
Initializing java.util.ResourceBundle$3
Initializing java.lang.ReflectiveOperationException
Initializing java.lang.ClassNotFoundException
Initializing java.util.ResourceBundle$ResourceBundleProviderHelper
Initializing java.util.ResourceBundle$ResourceBundleProviderHelper$$Lambda$2/0x0000000800060440
Initializing sun.security.util.SecurityConstants
Initializing java.security.AllPermission
Initializing java.net.NetPermission
Initializing java.lang.RuntimePermission
Initializing java.security.SecurityPermission
Initializing java.net.SocketPermission
Initializing sun.security.action.GetBooleanAction
Initializing sun.security.util.FilePermCompat
Initializing java.util.ResourceBundle$ResourceBundleProviderHelper$$Lambda$3/0x0000000800060840
Initializing java.util.ListResourceBundle
Initializing sun.launcher.resources.launcher
Initializing java.util.ResourceBundle$BundleReference
Initializing java.util.ResourceBundle$ResourceBundleProviderHelper$$Lambda$4/0x0000000800060c40
Initializing jdk.internal.module.Resources
Initializing jdk.internal.module.Checks
Initializing jdk.internal.loader.BuiltinClassLoader$5
Initializing java.util.concurrent.ConcurrentHashMap$ReservationNode
Initializing java.lang.module.ModuleReader
Initializing jdk.internal.module.SystemModuleFinders$SystemModuleReader
Initializing jdk.internal.module.SystemModuleFinders$SystemImage
Initializing jdk.internal.jimage.ImageReaderFactory
Initializing java.nio.file.Paths
Initializing java.nio.file.Path
Initializing java.nio.file.FileSystems
Initializing sun.nio.fs.DefaultFileSystemProvider
Initializing java.nio.file.spi.FileSystemProvider
Initializing java.nio.file.StandardOpenOption
Initializing sun.nio.fs.AbstractFileSystemProvider
Initializing sun.nio.fs.UnixFileSystemProvider
Initializing sun.nio.fs.LinuxFileSystemProvider
Initializing java.nio.file.FileSystem
Initializing sun.nio.fs.UnixFileSystem
Initializing sun.nio.fs.LinuxFileSystem
Initializing sun.nio.fs.UnixPath
Initializing sun.nio.fs.Util
Initializing java.lang.StringCoding
Initializing sun.nio.cs.ISO_8859_1
Initializing sun.nio.cs.US_ASCII
Initializing java.lang.StringCoding$1
Initializing sun.nio.fs.UnixNativeDispatcher
Initializing sun.nio.fs.UnixNativeDispatcher$1
Initializing java.lang.ClassLoader$2
Initializing java.lang.ClassLoader$NativeLibrary
Initializing java.util.ArrayDeque$DeqIterator
Initializing java.util.concurrent.ConcurrentHashMap$ValuesView
Initializing java.util.Enumeration
Initializing java.util.concurrent.ConcurrentHashMap$ValueIterator
Initializing sun.nio.fs.UnixFileAttributes
Initializing sun.nio.fs.UnixFileStoreAttributes
Initializing sun.nio.fs.UnixMountEntry
Initializing java.lang.ThreadLocal$ThreadLocalMap
Initializing java.lang.ThreadLocal$ThreadLocalMap$Entry
Initializing java.nio.CharBuffer
Initializing java.nio.HeapCharBuffer
Initializing java.nio.charset.CoderResult
Initializing java.nio.file.FileSystems$DefaultFileSystemHolder
Initializing java.nio.file.FileSystems$DefaultFileSystemHolder$1
Initializing java.net.URI$Parser
Initializing jdk.internal.jimage.ImageReaderFactory$1
Initializing jdk.internal.jimage.ImageReader
Initializing jdk.internal.jimage.BasicImageReader
Initializing jdk.internal.jimage.BasicImageReader$1
Initializing jdk.internal.jimage.ImageReader$SharedImageReader
Initializing java.lang.StringCoding$Result
Initializing jdk.internal.jimage.NativeImageBuffer
Initializing jdk.internal.jimage.NativeImageBuffer$1
Initializing sun.nio.ch.DirectBuffer
Initializing java.nio.MappedByteBuffer
Initializing java.nio.DirectByteBuffer
Initializing java.nio.Bits
Initializing java.util.concurrent.atomic.AtomicLong
Initializing java.nio.Bits$1
Initializing jdk.internal.jimage.ImageHeader
Initializing java.nio.IntBuffer
Initializing java.nio.DirectIntBufferU
Initializing java.nio.DirectByteBufferR
Initializing java.nio.DirectIntBufferRU
Initializing jdk.internal.jimage.ImageStringsReader
Initializing jdk.internal.jimage.decompressor.Decompressor
Initializing jdk.internal.jimage.ImageLocation
Initializing java.lang.StringUTF16
Initializing java.lang.invoke.DirectMethodHandle$Special
Initializing jdk.internal.module.SystemModuleFinders$SystemModuleReader$$Lambda$5/0x0000000800061840
Initializing java.text.Format
Initializing java.text.MessageFormat
Initializing java.util.Locale$Category
Initializing java.util.Locale$1
Initializing java.lang.StringBuffer
Initializing java.text.FieldPosition
Initializing java.text.AttributedCharacterIterator$Attribute
Initializing java.text.Format$Field
Initializing java.text.MessageFormat$Field
Initializing jdk.internal.misc.TerminatingThreadLocal
Initializing jdk.internal.misc.TerminatingThreadLocal$1
Initializing java.lang.Shutdown
Initializing java.lang.Shutdown$Lock
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