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8260630: Templatize literal_size #2310

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@kimbarrett kimbarrett commented Jan 29, 2021

Please review a couple of small cleanups in Hashtable support.

(1) Replace some "default" overloads for literal_size with a template. This
makes it easier to add new Hashtable value types whose sizes aren't
interesting for statistics printout.

(2) Trivial change to remove no longer used instantiation of Hashtable
support for oop values.

Testing:
mach5 tier1

/issue add 8260629


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$ git fetch https://git.openjdk.java.net/jdk pull/2310/head:pull/2310
$ git checkout pull/2310

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@bridgekeeper bridgekeeper bot commented Jan 29, 2021

👋 Welcome back kbarrett! 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.

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@kimbarrett kimbarrett marked this pull request as ready for review Jan 29, 2021
@openjdk openjdk bot added the rfr label Jan 29, 2021
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@openjdk openjdk bot commented Jan 29, 2021

@kimbarrett
Adding additional issue to issue list: 8260629: Remove explicit instantiation of Hashtable with oop value.

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@openjdk openjdk bot commented Jan 29, 2021

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

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When this pull request is ready to be reviewed, an "RFR" email will be sent to the corresponding mailing list. If you would like to change these labels, use the /label pull request command.

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@openjdk openjdk bot added the hotspot label Jan 29, 2021
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@mlbridge mlbridge bot commented Jan 29, 2021

Webrevs

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pliden
pliden approved these changes Jan 29, 2021
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@pliden pliden left a comment

Looks good to me!

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@openjdk openjdk bot commented Jan 29, 2021

@kimbarrett 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:

8260630: Templatize literal_size
8260629: Remove explicit instantiation of Hashtable with oop value

Reviewed-by: pliden, tschatzl, 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 3 new commits pushed to the master branch:

  • d2b0ea1: 8260282: Add option to compress heap dumps created by -XX:+HeapDumpOnOutOfMemoryError
  • a5fb517: 8259404: Shenandoah: Fix time tracking in parallel_cleaning
  • 0675473: 8252409: JShell: Intersection types cause NoSuchFieldError

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.

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@tschatzl tschatzl left a comment

Lgtm.

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@coleenp coleenp left a comment

Looks good!

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//
// Note: if you create a new subclass of Hashtable<MyNewType, F>, you will need to
// add a new function static int literal_size(MyNewType lit)
// because I can't get template <class T> int literal_size(T) to pick the specializations for Symbol and oop.
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@coleenp coleenp Jan 29, 2021

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I wrote that. Thanks for fixing this!

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static int literal_size(Klass*) { return 0; }
static int literal_size(nmethod*) { return 0; }
// Default overload, for types that are uninteresting.
template<typename T> static int literal_size(T) { return 0; }

static int literal_size(Symbol *symbol) {
return symbol->size() * HeapWordSize;
}

static int literal_size(oop obj) {
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@coleenp coleenp Jan 29, 2021

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Is literal_size(oop) still needed?

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@kimbarrett kimbarrett Jan 29, 2021

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It's used by literal_size(WeakHandle).

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@kimbarrett kimbarrett commented Jan 30, 2021

Thanks @pliden , @coleenp , @tschatzl for reviews.

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@kimbarrett kimbarrett commented Jan 30, 2021

/integrate

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@openjdk openjdk bot closed this Jan 30, 2021
@openjdk openjdk bot added integrated and removed ready rfr labels Jan 30, 2021
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@openjdk openjdk bot commented Jan 30, 2021

@kimbarrett Since your change was applied there have been 15 commits pushed to the master branch:

  • 6b24e98: 8259008: ArithmeticException was thrown at "Monitor Cache Dump" on HSDB
  • 69ee314: 8249867: xml declaration is not followed by a newline
  • fb46c91: 8260674: ProblemList jdk/incubator/vector/VectorHash.java in Xcomp configs
  • 71bfe96: 8217633: Configurable extensions with system properties
  • f5ca838: 8065773: JDI: UOE is not thrown, when redefineClasses changes a class modifier
  • 739bbd0: 8260566: Pattern type X is a subtype of expression type Y message is incorrect
  • b2e582a: 8259905: Compiler treats 'sealed' keyword as 'var' keyword
  • 6415d3b: 8259584: SuperWord::fix_commutative_inputs checks in_bb(fin1) instead of in_bb(fin2)
  • b7b391b: 8260625: Rename MetaspaceExpand_lock
  • 22bfa5b: 8255837: Shenandoah: Remove ShenandoahConcurrentRoots class
  • ... and 5 more: https://git.openjdk.java.net/jdk/compare/64a150c518ed1a936cd6e4cb5e60060243496901...master

Your commit was automatically rebased without conflicts.

Pushed as commit 67a34da.

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

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@kimbarrett kimbarrett deleted the templatize_literal_size branch Jan 30, 2021
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