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https://issues.apache.org/jira/browse/GROOVY-12479?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Paul King updated GROOVY-12479:
-------------------------------
Affects Version/s: 6.0.0
5.1.3
4.0.33
> SC: receiver expression is not evaluated when it is used to access a static
> field or call a static method
> ---------------------------------------------------------------------------------------------------------
>
> Key: GROOVY-12479
> URL: https://issues.apache.org/jira/browse/GROOVY-12479
> Project: Groovy
> Issue Type: Bug
> Affects Versions: 4.0.33, 5.1.3, 6.0.0
> Reporter: Paul King
> Assignee: Paul King
> Priority: Major
>
> Under {{@CompileStatic}}, when a static field or static method is reached
> through a receiver expression rather than a class name, the receiver
> expression is never evaluated. Any side effects it has are silently lost.
> Dynamic Groovy and {{@TypeChecked}} evaluate it, as Java does (JLS 15.11.1,
> 15.12.4.1: for a static member the receiver expression is evaluated and the
> result discarded).
> {code:groovy}
> class K { static final String CONST = 'c'; static String stat() { 's' } }
> class Probe {
> static List log = []
> static Class<Integer> pickClass() { log << 'pickClass'; Integer }
> static K pickInstance() { log << 'pickInstance'; new K() }
> }
> @groovy.transform.CompileStatic
> class CS {
> static a() { Probe.pickClass().MAX_VALUE } // static field via
> Class-typed expression
> static b() { Probe.pickInstance().CONST } // static field via
> instance-typed expression
> static c() { Probe.pickInstance().stat() } // static method via
> instance-typed expression
> static d() { Probe.pickClass().valueOf(1) } // static method via
> Class-typed expression
> }
> Probe.log.clear(); CS.a(); assert Probe.log == ['pickClass'] // fails: []
> Probe.log.clear(); CS.b(); assert Probe.log == ['pickInstance'] // fails: []
> Probe.log.clear(); CS.c(); assert Probe.log == ['pickInstance'] // fails: []
> Probe.log.clear(); CS.d(); assert Probe.log == ['pickClass'] // fails: []
> {code}
> The values are correct in every case; only the evaluation of the receiver is
> missing.
> ||Case||@CompileStatic||@TypeChecked||dynamic||
> |{{pickClass().MAX_VALUE}}|not evaluated|evaluated|evaluated|
> |{{pickInstance().CONST}}|not evaluated|evaluated|evaluated|
> |{{pickInstance().stat()}}|not evaluated|-|-|
> |{{pickClass().valueOf(1)}}|not evaluated|-|-|
> Same behaviour in 4.0.32, 5.1.2, 6.0.0 and master.
> *Expected:* the receiver expression is evaluated once, its value discarded,
> and the static member accessed, so the static-compiled result matches dynamic
> Groovy and Java.
> *Workaround:* evaluate the expression separately (e.g. {{def c = pickClass();
> c.MAX_VALUE}}), or access the member through the class name.
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