RFR: 8255757: Javac emits duplicate pool entries on array::clone

[Vicente Romero]

On Wed, 30 Dec 2020 17:55:48 GMT, Guoxiong Li <github.com+13688759+lgxbslgx at openjdk.org> wrote:

> Hi all,
> 
> Currently, javac would emit duplicate pool entries when compiling array::clone.
> This patch fixes it by using a cached field `Map<Type, Symbol> qualifiedSymbolCache;` and adds a corresponding test case.
> 
> Thank you for taking the time to review.
> 
> Best Regards.

Changes requested by vromero (Reviewer).

src/jdk.compiler/share/classes/com/sun/tools/javac/jvm/Gen.java line 244:

> 242:             // array clone can be qualified by the array type in later targets
> 243:             if (qualifiedSymbolCache == null) {
> 244:                 qualifiedSymbolCache = new HashMap<>();

given that the map is initialized in the constructor I assume that this line should never be executed right? also I think that  you can clear the map in the `finally` block of method `Gen::genClass`

test/langtools/tools/javac/classfiles/T8255757/T8255757.java line 77:

> 75:                 .outdir(curPath)
> 76:                 .run()
> 77:                 .writeAll();

nit: I think that invoking the `writeAll` method is not necessary as the output is discarded, so it can be removed from the chain

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PR: https://git.openjdk.java.net/jdk/pull/1912