8289856: [PPC64] SIGSEGV in C2Compiler::init_c2_runtime() after JDK-8289060

[TheRealMDoerr]

Clean backport of JDK-8289856. Avoids undefined behavior.

---

Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue

Issue

• JDK-8289856: [PPC64] SIGSEGV in C2Compiler::init_c2_runtime() after JDK-8289060

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk17u-dev pull/536/head:pull/536
$ git checkout pull/536

Update a local copy of the PR:
$ git checkout pull/536
$ git pull https://git.openjdk.org/jdk17u-dev pull/536/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 536

View PR using the GUI difftool:
$ git pr show -t 536

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk17u-dev/pull/536.diff

[bridgekeeper]

👋 Welcome back mdoerr! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[openjdk]

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

[openjdk]

@TheRealMDoerr This change now passes all automated pre-integration checks.

ℹ️ This project also has non-automated pre-integration requirements. Please see the file CONTRIBUTING.md for details.

After integration, the commit message for the final commit will be:

8289856: [PPC64] SIGSEGV in C2Compiler::init_c2_runtime() after JDK-8289060

You can use pull request commands such as /summary, /contributor and /issue to adjust it as needed.

At the time when this comment was updated there had been 10 new commits pushed to the master branch:

• 292e6bb: 8287902: UnreadableRB case in MissingResourceCauseTest is not working reliably on Windows
• 011b96c: 8272352: Java launcher can not parse Chinese character when system locale is set to UTF-8
• 882b5f5: 8287896: PropertiesTest.sh fail on msys2
• 2e21c87: 8287724: Fix various issues with msys2
• a391032: 8286573: Remove the unnecessary method Attr#attribTopLevel and its usage
• 00074c0: 8287895: Some langtools tests fail on msys2
• 204e67a: 8280863: Update build README to reflect that MSYS2 is supported
• e642821: 8289697: buffer overflow in MTLVertexCache.m: MTLVertexCache_AddGlyphQuad
• 0263aba: 8254318: Remove .hgtags
• ad7fab5: 8289799: Build warning in methodData.cpp memset zero-length parameter

Please see this link for an up-to-date comparison between the source branch of this pull request and the master branch.
As there are no conflicts, your changes will automatically be rebased on top of these commits when integrating. If you prefer to avoid this automatic rebasing, please check the documentation for the /integrate command for further details.

➡️ To integrate this PR with the above commit message to the master branch, type /integrate in a new comment.

[mlbridge]

Webrevs

• 00: Full (4c26f063)

[TheRealMDoerr]

/integrate

[openjdk]

Going to push as commit 48d1d41.
Since your change was applied there have been 12 commits pushed to the master branch:

• ccc4732: 8290004: [PPC64] JfrGetCallTrace: assert(_pc != nullptr) failed: must have PC
• a8e7d8f: 8288599: com/sun/management/OperatingSystemMXBean/TestTotalSwap.java: Expected total swap size ... but getTotalSwapSpaceSize returned ...
• 292e6bb: 8287902: UnreadableRB case in MissingResourceCauseTest is not working reliably on Windows
• 011b96c: 8272352: Java launcher can not parse Chinese character when system locale is set to UTF-8
• 882b5f5: 8287896: PropertiesTest.sh fail on msys2
• 2e21c87: 8287724: Fix various issues with msys2
• a391032: 8286573: Remove the unnecessary method Attr#attribTopLevel and its usage
• 00074c0: 8287895: Some langtools tests fail on msys2
• 204e67a: 8280863: Update build README to reflect that MSYS2 is supported
• e642821: 8289697: buffer overflow in MTLVertexCache.m: MTLVertexCache_AddGlyphQuad
• ... and 2 more: https://git.openjdk.org/jdk17u-dev/compare/a4642ae2021f2e60ed5ec49a69077ed0a2c6dbcd...master

Your commit was automatically rebased without conflicts.

[openjdk]

@TheRealMDoerr Pushed as commit 48d1d41.

💡 You may see a message that your pull request was closed with unmerged commits. This can be safely ignored.