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https://issues.apache.org/jira/browse/GROOVY-12552?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18140465#comment-18140465
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ASF GitHub Bot commented on GROOVY-12552:
-----------------------------------------
jdaugherty commented on PR #3081:
URL: https://github.com/apache/groovy/pull/3081#issuecomment-6716009772
@daniellansun, a gentle ping on your review: my reply of 30 Oct above
answers the getter/setter gate question, and the two concrete-accessor cases
you suggested are now tests in `Groovy12552`. I've rebased onto master to
resolve the conflict with GROOVY-12525, which reworked the getter block; the
change there is still only `methods.add(0, node)` and its comment. Could you
take another look when you have a chance, and say whether you'd like interface
default accessors handled here or in a separate issue?
> STC: property access calls an interface's accessor instead of the property's
> own when the property's class is in the same compilation unit
> ------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: GROOVY-12552
> URL: https://issues.apache.org/jira/browse/GROOVY-12552
> Project: Groovy
> Issue Type: Bug
> Components: Static Type Checker
> Affects Versions: 5.1.3
> Reporter: James Daugherty
> Priority: Major
>
> When an interface declares the setter and getter of a property that a class
> implements as a Groovy property, static compilation calls the interface's
> methods with {{invokeinterface}} when the class is compiled together with the
> caller, and the class's own accessors with {{invokevirtual}} when the class
> is already compiled. The behaviour at run time is the same, but the same
> source compiles to a different class file depending on what else is compiled.
> Groovy 4.0.33 calls the class's accessors in both cases.
> {code:groovy}
> interface Named {
> void setName(String name)
> String getName()
> }
> abstract class Base implements Named {
> String name
> }
> class Impl extends Base {}
> @groovy.transform.CompileStatic
> class Svc {
> String rename() {
> Base base = new Impl()
> base.name = 'x' // invokeinterface Named.setName when Base is in
> the unit, invokevirtual Impl.setName when it is compiled
> base.setName('y')
> base.getName()
> }
> }
> {code}
> Reproduced with 5.1.3 and master. A reproducer with a groovyc script and an
> incremental Gradle build:
> https://github.com/jdaugherty/groovy-property-accessor-interface-method
> *Cause*
> A property of a class in the compilation unit does not have its accessors yet
> when static type checking runs. {{StaticTypeCheckingVisitor.findMethod}} adds
> a synthetic accessor for the property when every method found is abstract
> (GROOVY-10922), but after the interface's method.
> {{StaticTypeCheckingSupport.removeCovariantsAndInterfaceEquivalents}} only
> drops an interface method that comes after the method of a class implementing
> it, so both stay. The receiver-distance tie-break in {{chooseBestMethods}}
> then ranks an interface implemented by the superclass at 1 and the superclass
> itself at 4, so the interface method is chosen whenever the receiver's
> inferred type is a subclass of the property's class ({{Impl}} here); with the
> receiver exactly {{Base}} the accessor is chosen already. A compiled class
> lists its real accessor first, and the interface method is dropped.
> *Proposed fix*
> Add the synthetic accessor first, where a compiled class has its accessor, so
> that it is preferred over the interface method the same way.
> Found while making incremental builds of a Grails application produce the
> same classes as a full build; see also GROOVY-12550 and GROOVY-12544.
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