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Kotlin: extract interface redeclarations of Object methods

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Due to a probable compiler bug (?) the redeclaration looks like a fake symbol, leading to Java dispatching against a declaration that Kotlin doesn't believe exists.
This commit is contained in:
Chris Smowton
2022-10-24 12:28:00 +01:00
parent 1d2087b92a
commit c6f4742f29
6 changed files with 45 additions and 7 deletions
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31
java/kotlin-extractor/src/main/kotlin/KotlinFileExtractor.kt
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@@ -27,6 +27,7 @@ import org.jetbrains.kotlin.load.java.structure.JavaClass
import org.jetbrains.kotlin.load.java.structure.JavaMethod
import org.jetbrains.kotlin.load.java.structure.JavaTypeParameter
import org.jetbrains.kotlin.load.java.structure.JavaTypeParameterListOwner
import org.jetbrains.kotlin.load.java.structure.impl.classFiles.BinaryJavaClass
import org.jetbrains.kotlin.name.FqName
import org.jetbrains.kotlin.types.Variance
import org.jetbrains.kotlin.util.OperatorNameConventions
@@ -98,15 +99,29 @@ open class KotlinFileExtractor(
}
}
private fun javaBinaryDeclaresMethod(c: IrClass, name: String) =
((c.source as? JavaSourceElement)?.javaElement as? BinaryJavaClass)?.methods?.any { it.name.asString() == name }
private fun isJavaBinaryDeclaration(f: IrFunction) =
f.parentClassOrNull?.let { javaBinaryDeclaresMethod(it, f.name.asString()) } ?: false
private fun isJavaBinaryObjectMethodRedeclaration(d: IrDeclaration) =
when (d) {
is IrFunction ->
when (d.name.asString()) {
"toString" -> d.valueParameters.isEmpty()
"hashCode" -> d.valueParameters.isEmpty()
"equals" -> d.valueParameters.singleOrNull()?.type?.isNullableAny() ?: false
else -> false
} && isJavaBinaryDeclaration(d)
else -> false
}
@OptIn(ObsoleteDescriptorBasedAPI::class)
private fun isFake(d: IrDeclarationWithVisibility): Boolean {
val visibility = d.visibility
if (visibility is DelegatedDescriptorVisibility && visibility.delegate == Visibilities.InvisibleFake) {
val hasFakeVisibility = d.visibility.let { it is DelegatedDescriptorVisibility && it.delegate == Visibilities.InvisibleFake } || d.isFakeOverride
if (hasFakeVisibility && !isJavaBinaryObjectMethodRedeclaration(d))
return true
}
if (d.isFakeOverride) {
return true
}
try {
if ((d as? IrFunction)?.descriptor?.isHiddenToOvercomeSignatureClash == true) {
return true
@@ -908,7 +923,9 @@ open class KotlinFileExtractor(
else
null
} else {
forceExtractFunction(f, parentId, extractBody, extractMethodAndParameterTypeAccesses, typeSubstitution, classTypeArgsIncludingOuterClasses).also {
// Work around an apparent bug causing redeclarations of `fun toString(): String` specifically in interfaces loaded from Java classes show up like fake overrides.
val overriddenVisibility = if (f.isFakeOverride && isJavaBinaryObjectMethodRedeclaration(f)) OverriddenFunctionAttributes(visibility = DescriptorVisibilities.PUBLIC) else null
forceExtractFunction(f, parentId, extractBody, extractMethodAndParameterTypeAccesses, typeSubstitution, classTypeArgsIncludingOuterClasses, overriddenAttributes = overriddenVisibility).also {
// The defaults-forwarder function is a static utility, not a member, so we only need to extract this for the unspecialised instance of this class.
if (classTypeArgsIncludingOuterClasses.isNullOrEmpty())
extractDefaultsFunction(f, parentId, extractBody, extractMethodAndParameterTypeAccesses)