RFR: 8318026: jcmd should provide access to detailed JVM object information [v11]

[David Holmes]

On Wed, 27 Mar 2024 18:31:50 GMT, Kevin Walls <kevinw at openjdk.org> wrote:

>> Introduce the jcmd "VM.inspect" to implement access to detailed JVM object information.
>> 
>> Not recommended for live production use.  Requires UnlockDiagnosticVMOptions and not included in jcmd help output, to remind us this is not a general-purpose customer-facing tool.
>
> Kevin Walls has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Test more pointer types: compiled method and metadata.

src/hotspot/share/services/diagnosticCommand.cpp line 1254:

> 1252:   DebuggingContext dc{}; // avoid asserts
> 1253: 
> 1254:   if (!UnlockDiagnosticVMOptions) {

Drive-by comment: As per the comment from @plummercj  this flag should not be hijacked for this purpose. If you need a VM flag to control this feature then please add one. Thanks.

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PR Review Comment: https://git.openjdk.org/jdk/pull/17655#discussion_r1547032078