8350106: [PPC] Avoid ticks_unknown_not_Java AsyncGetCallTrace() if JavaFrameAnchor::_last_Java_pc not set

[reinrich]

This pull request contains a backport of commit d5908231 from the openjdk/jdk21u-dev repository.

The commit being backported was authored by Richard Reingruber on 22 Jul 2025 and was reviewed by Paul Hohensee.

The backport required trivial adaptations

• of copyright headers
• of the hunk that includes os.inline.hpp because of a diff in the context
• and because frame::abi_minframe was renamed frame::common_abi in higher releases

Risk is low because the patch is small and ppc only. The code is only reached when profiling with jfr or async-profiler.

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Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• Change must not contain extraneous whitespace
• JDK-8350106 needs maintainer approval
• Commit message must refer to an issue

Issue

• JDK-8350106: [PPC] Avoid ticks_unknown_not_Java AsyncGetCallTrace() if JavaFrameAnchor::_last_Java_pc not set (Bug - P4)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk17u-dev.git pull/3957/head:pull/3957
$ git checkout pull/3957

Update a local copy of the PR:
$ git checkout pull/3957
$ git pull https://git.openjdk.org/jdk17u-dev.git pull/3957/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 3957

View PR using the GUI difftool:
$ git pr show -t 3957

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk17u-dev/pull/3957.diff

[bridgekeeper]

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[openjdk]

❗ This change is not yet ready to be integrated.
See the Progress checklist in the description for automated requirements.

[openjdk]

This backport pull request has now been updated with issue from the original commit.