8265900: Use pattern matching for instanceof at module jdk.compiler(part 2) #3674

lgxbslgx · 2021-04-25T09:20:49Z

Hi all,

This series of patches update the code of the module jdk.compiler by using the pattern matching for instanceof.

This patch would revise the following packages:

com.sun.tools.javac.code
com.sun.tools.javac.comp
com.sun.tools.javac.jvm
com.sun.tools.javac.parser
com.sun.tools.javac.processing

Thank you for taking the time to review.

--
Best Regards,
Guoxiong.

Progress

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Issue

JDK-8265900: Use pattern matching for instanceof at module jdk.compiler(part 2)

Reviewers

Maurizio Cimadamore (@mcimadamore - Reviewer) ⚠️ Review applies to 5697026

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.java.net/jdk pull/3674/head:pull/3674
$ git checkout pull/3674

Update a local copy of the PR:
$ git checkout pull/3674
$ git pull https://git.openjdk.java.net/jdk pull/3674/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 3674

View PR using the GUI difftool:
$ git pr show -t 3674

Using diff file

Download this PR as a diff file:
https://git.openjdk.java.net/jdk/pull/3674.diff

…art 2)

bridgekeeper · 2021-04-25T09:21:43Z

👋 Welcome back gli! 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 · 2021-04-25T09:24:15Z

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

compiler

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.

mlbridge · 2021-04-25T09:36:18Z

Webrevs

01: Full - Incremental (55de5a07)
00: Full (56970261)

mcimadamore

Looks good, one minor nit comment

mcimadamore · 2021-04-26T13:48:01Z

src/jdk.compiler/share/classes/com/sun/tools/javac/code/Scope.java

@@ -753,8 +753,8 @@ public void finalizeScope() {
        }

        protected Scope finalizeSingleScope(Scope impScope) {
-            if (impScope instanceof FilterImportScope && impScope.owner.kind == Kind.TYP &&
-                ((FilterImportScope) impScope).isStaticallyImported()) {
+            if (impScope instanceof FilterImportScope filterImportScope && impScope.owner.kind == Kind.TYP &&


break vertically on each && ?

mcimadamore · 2021-04-26T13:49:17Z

src/jdk.compiler/share/classes/com/sun/tools/javac/comp/ArgumentAttr.java

-            } else {
-                return false;
-            }
+            return (obj instanceof UniquePos uniquePos)


For another day - UniquePos can be a record :-)

mcimadamore · 2021-04-26T13:52:17Z

src/jdk.compiler/share/classes/com/sun/tools/javac/jvm/PoolConstant.java

-                } else {
-                    return false;
-                }
+                return (obj instanceof BsmKey key)


BsmKey smells of records too...

openjdk · 2021-04-26T13:54:19Z

@lgxbslgx 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:

8265900: Use pattern matching for instanceof at module jdk.compiler(part 2)

Reviewed-by: mcimadamore

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 19 new commits pushed to the master branch:

68011c6: 8265928: G1: Update copyright in several files
222f9f0: 8265682: G1: Mutex::_name dangling in HeapRegionRemSet references after JDK-8264146
2b09ff2: 8232765: NullPointerException at Types.eraseNotNeeded() when compiling a class
b9f66d9: 8264188: Improve handling of assembly files in the JDK
c3ac690: 8261759: ZGC: ZWorker Threads Continue Marking After System.exit() called
31abe68: 8265116: ZGC: Steal local stacks instead of flushing them
83364a4: 8264258: Unknown lookups in the java package give misleading compilation errors
a9367db: 8265127: ZGC: Fix incorrect reporting of reclaimed memory
1580a47: 8265911: assert(comp != __null) failed: Compiler instance missing
9647fb0: 8265689: JVMCI: InternalError: Class java.lang.Object does not implement interface jdk.vm.ci.meta.JavaType
... and 9 more: https://git.openjdk.java.net/jdk/compare/f6e22d14e3ee529f21ab8747cfbafe72b906ec68...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 (@mcimadamore) 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).

mlbridge · 2021-04-26T14:06:02Z

Mailing list message from Brian Goetz on compiler-dev:

Also, FYI: we had a discussion over a similar topic over on corelibs,
and settled on making the binding variable names a little less "fussy",
especially in patterns like Object::equals (calling it `that` or `other`
is fine; we don't have to call it `standardFinalManager`.)? These are
convenience variables with small scopes; they don't need super-specific
names (and the super-specific names often make the code harder to
read.)? You don't have to go and change them, just keep this in mind for
next time.

On 4/26/2021 9:55 AM, Maurizio Cimadamore wrote:

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mlbridge · 2021-04-26T14:20:02Z

Mailing list message from Guoxiong Li on compiler-dev:

Hi Brian,

Thank you for your reminder. It is a good suggestion about code readability.

--
Best Regards,
Guoxiong.

On Mon, Apr 26, 2021 at 10:04 PM Brian Goetz <brian.goetz at oracle.com> wrote:

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lgxbslgx · 2021-04-26T14:39:19Z

@mcimadamore I updated the code. Could I get your help to re-review and sponsor? Thanks a lot.

/integrate

openjdk · 2021-04-26T14:40:21Z

@lgxbslgx
Your change (at version 55de5a0) is now ready to be sponsored by a Committer.

mcimadamore · 2021-04-26T16:39:59Z

/sponsor

openjdk · 2021-04-26T17:33:04Z

@mcimadamore @lgxbslgx Since your change was applied there have been 22 commits pushed to the master branch:

851b219: 8265901: Use pattern matching for instanceof at module jdk.compiler(part 3)
fb8f0c5: 8261168: Convert javadoc tool to use Stream.toList()
8559a53: 8265394: G1: Improve assert in HeapRegion::reset_not_compacted_after_full_gc
68011c6: 8265928: G1: Update copyright in several files
222f9f0: 8265682: G1: Mutex::_name dangling in HeapRegionRemSet references after JDK-8264146
2b09ff2: 8232765: NullPointerException at Types.eraseNotNeeded() when compiling a class
b9f66d9: 8264188: Improve handling of assembly files in the JDK
c3ac690: 8261759: ZGC: ZWorker Threads Continue Marking After System.exit() called
31abe68: 8265116: ZGC: Steal local stacks instead of flushing them
83364a4: 8264258: Unknown lookups in the java package give misleading compilation errors
... and 12 more: https://git.openjdk.java.net/jdk/compare/f6e22d14e3ee529f21ab8747cfbafe72b906ec68...master

Your commit was automatically rebased without conflicts.

Pushed as commit 082abbd.

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

8265900: Use pattern matching for instanceof at module jdk.compiler(p…

5697026

…art 2)

openjdk bot added the compiler compiler-dev@openjdk.org label Apr 25, 2021

lgxbslgx marked this pull request as ready for review April 25, 2021 09:29

openjdk bot added the rfr Pull request is ready for review label Apr 25, 2021

mcimadamore approved these changes Apr 26, 2021

View reviewed changes

openjdk bot added the ready Pull request is ready to be integrated label Apr 26, 2021

Refactor code style

55de5a0

openjdk bot added the sponsor Pull request is ready to be sponsored label Apr 26, 2021

openjdk bot closed this Apr 26, 2021

openjdk bot added integrated Pull request has been integrated and removed sponsor Pull request is ready to be sponsored ready Pull request is ready to be integrated rfr Pull request is ready for review labels Apr 26, 2021

lgxbslgx deleted the JDK-8265900 branch April 26, 2021 23:26

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8265900: Use pattern matching for instanceof at module jdk.compiler(part 2) #3674

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8265900: Use pattern matching for instanceof at module jdk.compiler(part 2) #3674

8265900: Use pattern matching for instanceof at module jdk.compiler(part 2) #3674

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