RFR: 8372802: PrintFlagsFinal should also print locked flags

[Leonid Mesnik]

On Mon, 1 Dec 2025 14:56:54 GMT, Frederic Thevenet <fthevenet at openjdk.org> wrote:

> This change aims to provide a way to print all flags including "locked" ones (e.g. Diagnostic and Experimental) without having to explicitly set `+UnlockExperimentalVMOptions` or `+UnlockDiagnosticVMOptions` 
> 
> This applies to the following VM options: `PrintFlagsFinal` , `PrintFlagsRanges`, `PrintFlagsInitial`, `PrintFlagsWithComments`, `-XprintFlags`, as well as the `PrintVMFlagsDCmd` diagnostic command (when set to show all flags).
> 
> Places that print out only flags that have been changed (i.e. that skip flags with default values), like when during the generation of hs_err reports, are not affected by this.

Marked as reviewed by lmesnik (Reviewer).

test/hotspot/jtreg/runtime/CommandLine/PrintAllFlags.java line 30:

> 28:  *  +UnlockDiagnosticVMOptions are set than when they aren't.
> 29:  * @requires vm.flagless
> 30:  * @modules java.base/jdk.internal.misc

Is it needed? I don't see internal API usage.

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PR Review: https://git.openjdk.org/jdk/pull/28579#pullrequestreview-3526616134
PR Review Comment: https://git.openjdk.org/jdk/pull/28579#discussion_r2578333944