RFR: 8258471: "search codecache" clhsdb command does not work

[Chris Plummer]

On Wed, 16 Dec 2020 10:27:05 GMT, Yasumasa Suenaga <ysuenaga at openjdk.org> wrote:

> `search codecache` command does not work as following:
> 
> hsdb> search codecache 0x7fedbd0aec90
> java.lang.RuntimeException: Unable to deduce type of CodeBlob from address 0x00007fedbc85e810 (expected type nmethod, RuntimeStub, SafepointBlob, DeoptimizationBlob, or ExceptionBlob)
>         at jdk.hotspot.agent/sun.jvm.hotspot.code.CodeCache.createCodeBlobWrapper(CodeCache.java:177)
>         at jdk.hotspot.agent/sun.jvm.hotspot.memory.CodeHeap.iterate(CodeHeap.java:111)
>         at jdk.hotspot.agent/sun.jvm.hotspot.code.CodeCache.iterate(CodeCache.java:185)
>         at jdk.hotspot.agent/sun.jvm.hotspot.CommandProcessor$40.doit(CommandProcessor.java:1535)
>         at jdk.hotspot.agent/sun.jvm.hotspot.CommandProcessor.executeCommand(CommandProcessor.java:2051)
>         at jdk.hotspot.agent/sun.jvm.hotspot.CommandProcessor.executeCommand(CommandProcessor.java:2021)
>         at jdk.hotspot.agent/sun.jvm.hotspot.CommandProcessor.run(CommandProcessor.java:1901)
>         at jdk.hotspot.agent/sun.jvm.hotspot.CLHSDB.run(CLHSDB.java:99)
>         at jdk.hotspot.agent/sun.jvm.hotspot.CLHSDB.main(CLHSDB.java:40)
>         at jdk.hotspot.agent/sun.jvm.hotspot.SALauncher.runCLHSDB(SALauncher.java:280)
>         at jdk.hotspot.agent/sun.jvm.hotspot.SALauncher.main(SALauncher.java:483)
> 
> I checked the Object which points 0x7fedbd0aec90, it was `VtableBlob`. It has been introduced in [JDK-8199406](https://bugs.openjdk.java.net/browse/JDK-8199406), but it did not change SA code.
> 
> SA should support `VtableBlob`.

Marked as reviewed by cjplummer (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/1800