RFR: 8255757: Javac emits duplicate pool entries on array::clone [v2]

[Guoxiong Li]

On Wed, 30 Dec 2020 22:40:13 GMT, Vicente Romero <vromero at openjdk.org> wrote:

>> Guoxiong Li has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Cleanup variable and useless test code.
>
> 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`

I assumed that other developers will revise `qualifiedSymbolCache` elsewhere in the future. So I judge if it is null to avoid NPE.  The newly added code in the finally block of `Gen::genClass`  states that this judgement is necessary.

> 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

Fixed.

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