8265867: thread.hpp defines some enums but no reference #3702

navyxliu · 2021-04-26T18:54:37Z

Deleted 2 useless enums.

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Issue

JDK-8265867: thread.hpp defines some enums but no reference

Reviewers

David Holmes (@dholmes-ora - Reviewer)
Thomas Stuefe (@tstuefe - Reviewer)
Ioi Lam (@iklam - Reviewer)
Coleen Phillimore (@coleenp - Reviewer)

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Checkout this PR locally:
$ git fetch https://git.openjdk.java.net/jdk pull/3702/head:pull/3702
$ git checkout pull/3702

Update a local copy of the PR:
$ git checkout pull/3702
$ git pull https://git.openjdk.java.net/jdk pull/3702/head

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Checkout this PR locally:
$ git pr checkout 3702

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https://git.openjdk.java.net/jdk/pull/3702.diff

This patch also added const and constexpr specifiers for the applicable member functions.

bridgekeeper · 2021-04-26T18:54:59Z

👋 Welcome back xliu! 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 · 2021-04-26T18:57:06Z

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

hotspot

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mlbridge · 2021-04-26T19:00:56Z

Webrevs

01: Full - Incremental (244b5aa0)
00: Full (830ae1a3)

coleenp · 2021-04-26T20:58:47Z

src/hotspot/share/gc/shared/threadLocalAllocBuffer.hpp

+  static constexpr ByteSize start_offset()       { return byte_offset_of(ThreadLocalAllocBuffer, _start); }
+  static constexpr ByteSize end_offset()         { return byte_offset_of(ThreadLocalAllocBuffer, _end); }
+  static constexpr ByteSize top_offset()         { return byte_offset_of(ThreadLocalAllocBuffer, _top); }
+  static constexpr ByteSize pf_top_offset()      { return byte_offset_of(ThreadLocalAllocBuffer, _pf_top); }


Is constexpr really necessary here? Isn't this usually a constant expression for most compilers?

We have many of these inline functions that could be either const and constexpr. Since constexpr has been allowed only recently, there are very few functions that are actually declared constexpr.

My recommendation is to limit constexpr only to new code. We can change const to constexpr when required (e.g., when an existing function is called by new code that's in a constexpr context). That way, we can limit code churn.

I agree and it's more characters to look at for no real performance benefit. These offset functions are in many classes.

dholmes-ora

Hi Xin,

Please don't mix together cleanups this way. Getting rid of unused enums is fine, but 99% of the patch relates to const and constexpr. I had trouble finding the enum changes among the rest, and what would otherwise be a short and trivial patch becomes more unweildy and requires a lot more time to review. A separate RFE for those would be better IMO.

Thanks,
David

navyxliu · 2021-04-27T04:39:23Z

Hi Xin,

Please don't mix together cleanups this way. Getting rid of unused enums is fine, but 99% of the patch relates to const and constexpr. I had trouble finding the enum changes among the rest, and what would otherwise be a short and trivial patch becomes more unweildy and requires a lot more time to review. A separate RFE for those would be better IMO.

Thanks,
David

hi, David,

Thanks. I will create another JBS to track const and constexpr issue.
Sorry, I felt it was too "trivial" if one PR just deletes two enums. I will pay attention to it.

thanks,
--lx

tstuefe

I like this change (both the constness fixes and the removal of enums), but as David said, please make them two changes and give them clear titles.

Wrt to the constexpr, I am not against this since constexpr is to my understanding mostly a safety measure against bitrot, preventing us from accidentally making a constexpr function non-const. But the majority seems not to like that part, so I'd just leave it out for now.

Cheers, Thomas

tstuefe · 2021-04-27T05:06:53Z

src/hotspot/share/runtime/thread.hpp

@@ -1086,7 +1074,7 @@ class JavaThread: public Thread {

  // last_Java_sp
  bool has_last_Java_frame() const               { return _anchor.has_last_Java_frame(); }
-  intptr_t* last_Java_sp() const                 { return _anchor.last_Java_sp(); }
+  intptr_t* last_Java_sp()   const               { return _anchor.last_Java_sp(); }


Why the whitespace change?

I try to align with above "const". I will format this patch better next time.

openjdk · 2021-04-27T19:52:56Z

@navyxliu 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:

8265867: thread.hpp defines some enums but no reference

Reviewed-by: dholmes, stuefe, iklam, coleenp

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 53 new commits pushed to the master branch:

0438cea: 8136517: [macosx]Test java/awt/Focus/8073453/AWTFocusTransitionTest.java fails on MacOSX
6b5e5d7: 8266181: compiler/eliminateAutobox/TestEliminateBoxInDebugInfo should be in driver mode
81b1502: 8266161: mark hotspot compiler/rtm tests which ignore VM flags
4a8324d: 8266180: compiler/vectorapi/TestVectorErgonomics should be run in driver mode
0601aba: 8266175: mark hotspot compiler/jsr292 tests which ignore VM flags
69ad8ac: 8266169: mark hotspot compiler/jvmci tests which ignore VM flags
1a2a570: 8266166: mark hotspot compiler/linkage tests which ignore VM flags
5ee58b0: 8266164: mark hotspot compiler/loopstripmining tests which ignore VM flags
1a37bce: 8263779: SSLEngine reports NEED_WRAP continuously without producing any further output
889d246: 8265917: Different values computed by C2 and interpreter/C1 for Math.pow(x, 2.0) on x86_32
... and 43 more: https://git.openjdk.java.net/jdk/compare/b9f66d93ebf7e36e5658b1e1569bb635b2a75401...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.

As you do not have Committer status in this project an existing Committer must agree to sponsor your change. Possible candidates are the reviewers of this PR (@dholmes-ora, @tstuefe, @iklam, @coleenp) but any other Committer may sponsor as well.

➡️ To flag this PR as ready for integration with the above commit message, type /integrate in a new comment. (Afterwards, your sponsor types /sponsor in a new comment to perform the integration).

navyxliu · 2021-04-27T21:13:38Z

Thanks reviewers.

I took a look at the building failure on macos. it should not be relevant to this patch.
Linker editor can't resolve the symbol __Copy_conjoint_words on macos/arm64.

2021-04-27T18:48:46.3842240Z Undefined symbols for architecture arm64:
2021-04-27T18:48:46.3873510Z   "__Copy_conjoint_words", referenced from:
2021-04-27T18:48:46.3894950Z       G1FullGCCompactTask::G1CompactRegionClosure::apply(oopDesc*) in g1FullGCCompactTask.o
2021-04-27T18:48:46.3931360Z       PSParallelCompact::decrement_destination_counts(ParCompactionManager*, PSParallelCompact::SpaceId, unsigned long, HeapWordImpl**) in psParallelCompact.o
2021-04-27T18:48:46.3950530Z       PSParallelCompact::copy_back(HeapWordImpl**, HeapWordImpl**) in psParallelCompact.o
2021-04-27T18:48:46.3997600Z       PSParallelCompact::fill_region(ParCompactionManager*, MoveAndUpdateClosure&, unsigned long) in psParallelCompact.o
2021-04-27T18:48:46.4034130Z       MoveAndUpdateClosure::copy_partial_obj() in psParallelCompact.o
2021-04-27T18:48:46.4052290Z       MoveAndUpdateClosure::copy_until_full() in psParallelCompact.o
2021-04-27T18:48:46.4101250Z       MoveAndUpdateClosure::do_addr(HeapWordImpl**, unsigned long) in psParallelCompact.o
2021-04-27T18:48:46.4137880Z       ...
...
2021-04-27T18:48:46.4792490Z ld: symbol(s) not found for architecture arm64
2021-04-27T18:48:46.4834120Z clang: error: linker command failed with exit code 1 (use -v to see invocation)
2021-04-27T18:48:46.4919160Z gmake[3]: *** [lib/CompileJvm.gmk:144: /Users/runner/work/jdk/jdk/jdk/build/macos-aarch64/support/modules_libs/java.base/server/libjvm.dylib] Error 1
2021-04-27T18:48:46.4920590Z gmake[3]: *** Waiting for unfinished jobs....
2021-04-27T18:48:46.7713910Z gmake[2]: *** [make/Main.gmk:255: hotspot-server-libs] Error 2

navyxliu · 2021-04-27T21:14:04Z

/integrate

openjdk · 2021-04-27T21:15:16Z

@navyxliu
Your change (at version 244b5aa) is now ready to be sponsored by a Committer.

coleenp

Looks good!

dholmes-ora

Looks good - and now trivial :)

Thanks,
David

tstuefe

+1

iklam · 2021-04-28T06:54:12Z

/sponsor

openjdk · 2021-04-28T06:55:32Z

@iklam @navyxliu Since your change was applied there have been 58 commits pushed to the master branch:

75a2354: 8266028: C2 computes -0.0 for Math.pow(-0.0, 0.5)
ca37be1: 8197800: Test java/awt/Focus/NonFocusableWindowTest/NoEventsTest.java fails on Windows
cf92693: 8198619: java/awt/Focus/FocusTraversalPolicy/ButtonGroupLayoutTraversal/ButtonGroupLayoutTraversalTest.java fails on mac
2201e11: 8266055: ZGC: ZHeap::print_extended_on() doesn't disable deferred delete
ce48f04: 8198617: java/awt/Focus/6382144/EndlessLoopTest.java fails on mac
0438cea: 8136517: [macosx]Test java/awt/Focus/8073453/AWTFocusTransitionTest.java fails on MacOSX
6b5e5d7: 8266181: compiler/eliminateAutobox/TestEliminateBoxInDebugInfo should be in driver mode
81b1502: 8266161: mark hotspot compiler/rtm tests which ignore VM flags
4a8324d: 8266180: compiler/vectorapi/TestVectorErgonomics should be run in driver mode
0601aba: 8266175: mark hotspot compiler/jsr292 tests which ignore VM flags
... and 48 more: https://git.openjdk.java.net/jdk/compare/b9f66d93ebf7e36e5658b1e1569bb635b2a75401...master

Your commit was automatically rebased without conflicts.

Pushed as commit 164454f.

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

8265867: thread.hpp defines some enums but no reference

830ae1a

This patch also added const and constexpr specifiers for the applicable member functions.

openjdk bot added the rfr Pull request is ready for review label Apr 26, 2021

openjdk bot added the hotspot hotspot-dev@openjdk.org label Apr 26, 2021

coleenp reviewed Apr 26, 2021

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dholmes-ora suggested changes Apr 27, 2021

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tstuefe reviewed Apr 27, 2021

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Revert code change about "constness".

244b5aa

iklam approved these changes Apr 27, 2021

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openjdk bot added the ready Pull request is ready to be integrated label Apr 27, 2021

openjdk bot added the sponsor Pull request is ready to be sponsored label Apr 27, 2021

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8265867: thread.hpp defines some enums but no reference #3702

8265867: thread.hpp defines some enums but no reference #3702

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8265867: thread.hpp defines some enums but no reference #3702

8265867: thread.hpp defines some enums but no reference #3702

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