8266426: ZHeapIteratorOopClosure does not handle native access properly

[albertnetymk]

Change the inheritance hierarchy of ZHeapIteratorOopClosure so that we can know whether we are loading oops from in-heap or outside-heap (only CLD iteration).

---

Progress

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

Issue

• JDK-8266426: ZHeapIteratorOopClosure does not handle native access properly

Reviewers

• Stefan Karlsson (@stefank - Reviewer)
• Per Liden (@pliden - Reviewer)

Contributors

• Per Liden <pliden@openjdk.org>
• Erik Österlund <eosterlund@openjdk.org>
• Stefan Karlsson <stefank@openjdk.org>

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.java.net/jdk pull/3838/head:pull/3838
$ git checkout pull/3838

Update a local copy of the PR:
$ git checkout pull/3838
$ git pull https://git.openjdk.java.net/jdk pull/3838/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 3838

View PR using the GUI difftool:
$ git pr show -t 3838

Using diff file

Download this PR as a diff file:
https://git.openjdk.java.net/jdk/pull/3838.diff

[bridgekeeper]

👋 Welcome back ayang! 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]

@albertnetymk The following label will be automatically applied to this pull request:

• hotspot-gc

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[albertnetymk]

/contributor add pliden
/contributor add eosterlund

[openjdk]

@albertnetymk
Contributor Per Liden <pliden@openjdk.org> successfully added.

[openjdk]

@albertnetymk
Contributor Erik Österlund <eosterlund@openjdk.org> successfully added.

[mlbridge]

Webrevs

• 02: Full - Incremental (ccd50f49)
• 01: Full - Incremental (33cd1d65)
• 00: Full (c29dfb08)

[stefank]

This adds an non-trivial is_in call to each visited oop*. I'd like to see if this could instead be solved by letting the used closure "know" when it scans CLDs, and only in that case use NativeAccess.

[albertnetymk]

/contributor add stefank

[openjdk]

@albertnetymk
Contributor Stefan Karlsson <stefank@openjdk.org> successfully added.

[stefank]

Looks good

[pliden]

Looks good.

[openjdk]

@albertnetymk 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:

8266426: ZHeapIteratorOopClosure does not handle native access properly

Co-authored-by: Per Liden <pliden@openjdk.org>
Co-authored-by: Erik Österlund <eosterlund@openjdk.org>
Co-authored-by: Stefan Karlsson <stefank@openjdk.org>
Reviewed-by: stefank, pliden

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 136 new commits pushed to the master branch:

• 51f5adf: 8265047: Inconsistent warning message in jcmd VM.log
• ea30bd6: 8263362: Avoid division by 0 in java/awt/font/TextJustifier.java justify
• 0f9852c: 8266168: -Wmaybe-uninitialized happens in check_code.c
• a86ee9b: 8266545: 8261169 broke Harfbuzz build with gcc 7 and 8
• 2dd5667: 8266018: Shenandoah: fix an incorrect assert
• 22ca62c: 8266542: Remove broken -XX:-UseLoopSafepoints flag
• 7835cdb: 8265915: adjust state_unloading_cycle compuation order in nmethod::is_unloading
• 20ad428: 8180568: Refactor javax/crypto shell tests to plain java tests
• 138d573: 8262392: Update Mesa 3-D Headers to version 21.0.3
• 9de62a4: 8266505: Cleanup LibraryCallKit::make_unsafe_address()
• ... and 126 more: https://git.openjdk.java.net/jdk/compare/e325a750ac795181f14b278fcd171170dbb3bbd5...master

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.

[albertnetymk]

Thank you very much for the help on creating this patch.

/integrate

[openjdk]

@albertnetymk Since your change was applied there have been 138 commits pushed to the master branch:

• 2438498: 8252758: Lanai: Optimize index calculation while copying glyphs
• eb3b96d: 8266496: WBIsKlassAliveClosure.do_klass() fails for hidden classes
• 51f5adf: 8265047: Inconsistent warning message in jcmd VM.log
• ea30bd6: 8263362: Avoid division by 0 in java/awt/font/TextJustifier.java justify
• 0f9852c: 8266168: -Wmaybe-uninitialized happens in check_code.c
• a86ee9b: 8266545: 8261169 broke Harfbuzz build with gcc 7 and 8
• 2dd5667: 8266018: Shenandoah: fix an incorrect assert
• 22ca62c: 8266542: Remove broken -XX:-UseLoopSafepoints flag
• 7835cdb: 8265915: adjust state_unloading_cycle compuation order in nmethod::is_unloading
• 20ad428: 8180568: Refactor javax/crypto shell tests to plain java tests
• ... and 128 more: https://git.openjdk.java.net/jdk/compare/e325a750ac795181f14b278fcd171170dbb3bbd5...master

Your commit was automatically rebased without conflicts.

Pushed as commit 47d4438.

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