[jira] [Resolved] (GROOVY-11309) Optimise bytecode for empty list expressions

["Eric Milles (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/GROOVY-11309?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Eric Milles resolved GROOVY-11309.
----------------------------------
    Fix Version/s: 5.0.0-alpha-11
       Resolution: Fixed

https://github.com/apache/groovy/commit/1bb575f2ef71ea822d621afb4630fba612878387

> Optimise bytecode for empty list expressions
> --------------------------------------------
>
>                 Key: GROOVY-11309
>                 URL: https://issues.apache.org/jira/browse/GROOVY-11309
>             Project: Groovy
>          Issue Type: Improvement
>          Components: class generator, Compiler
>    Affects Versions: 2.5.23
>            Reporter: Oscar N
>            Assignee: Eric Milles
>            Priority: Minor
>             Fix For: 5.0.0-alpha-11
>
>
> I have the following code:
> {code:groovy}
> class Book {
>     String title
>     String blurb = ''
>     List<String> authors = []
> }
> {code}
> When checking the compiled output, the creation of the empty list goes through ScriptBytecodeAdapter:
> {code:java}
> @Generated
> public Book() {
>     String var1 = "";
>     this.blurb = var1;
>     List var2 = ScriptBytecodeAdapter.createList(new Object[0]);
>     this.authors = var2;
>     MetaClass var3 = this.$getStaticMetaClass();
>     this.metaClass = var3;
> }
> {code}
> This case can be simplified to "List var2 = new ArrayList()", which would avoid some overhead and slightly improve @POJO support.



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