8332105: Exploded JDK does not include CDS

[tstuefe]

An exploded JDK cannot be used with either -Xshare:on or -Xshare:auto. That causes tests like runtime/CompressedOops/CompressedCPUSpecificClassSpaceReservation.java to fail when running on an exploded JDK.

Since an exploded JDK cannot use CDS, we should - for tests - treat it as if CDS had not been included.

/label hotspot

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Note that I was torn between two ways to fix this:

• either this fix, which is rather simple and automatically updates the "vm.cds" @requires property
• or to expose "exploded-ness" as a boolean property via WhiteBox and VMProps(jdk.exploded). See this draft PR: 8332074: Create a "jdk.exploded" test property to check if the testee jdk is exploded #19178 .

The latter is cleaner and clearer, conveying the message of exploded-ness without muddling it with the CDS aspect. But OTOH the complexity may not be required.

I can go either way, though I have a slight preference for this PR, which is why I posted it.

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Progress

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Issue

• JDK-8332105: Exploded JDK does not include CDS (Enhancement - P4)

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Update a local copy of the PR:
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$ git pull https://git.openjdk.org/jdk.git pull/19188/head

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$ git pr checkout 19188

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[bridgekeeper]

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[openjdk]

@tstuefe
The hotspot label was successfully added.

[mlbridge]

Webrevs

• 00: Full (179d00b3)

[tstuefe]

Any takers?