KT-65425 [SLC] Correctly compute getQualifiedName for generated classes

Since the declarations generated by compiler plugins do not have proper
PSI (`classOrObjectDeclaration` in this case), we need to resort to
symbols for such declarations to compute the proper qualified name

^KT-65425 Fixed

analysis/low-level-api-fir/tests/org/jetbrains/kotlin/analysis/low/level/api/fir/test/configurators/AnalysisApiFirLibraryBinaryTestConfigurator.kt

@@ -12,6 +12,7 @@ import org.jetbrains.kotlin.analysis.api.impl.base.test.configurators.AnalysisAp
 import org.jetbrains.kotlin.analysis.api.impl.base.test.configurators.AnalysisApiLibraryBaseTestServiceRegistrar
 import org.jetbrains.kotlin.analysis.api.standalone.base.project.structure.KtModuleProjectStructure
 import org.jetbrains.kotlin.analysis.low.level.api.fir.test.base.AnalysisApiFirTestServiceRegistrar
+import org.jetbrains.kotlin.analysis.low.level.api.fir.test.base.configureOptionalTestCompilerPlugin
 import org.jetbrains.kotlin.analysis.test.framework.project.structure.KtLibraryBinaryModuleFactory
 import org.jetbrains.kotlin.analysis.test.framework.project.structure.KtModuleFactory
 import org.jetbrains.kotlin.analysis.test.framework.project.structure.TestModuleStructureFactory
@@ -34,6 +35,7 @@ object AnalysisApiFirLibraryBinaryTestConfigurator : AnalysisApiTestConfigurator
         builder.apply {
             useAdditionalService<KtModuleFactory> { KtLibraryBinaryModuleFactory }
             configureLibraryCompilationSupport(this)
+            configureOptionalTestCompilerPlugin()
         }
     }
 

analysis/symbol-light-classes/src/org/jetbrains/kotlin/light/classes/symbol/classes/SymbolLightClassForClassLike.kt

@@ -158,7 +158,12 @@ abstract class SymbolLightClassForClassLike<SType : KtClassOrObjectSymbol> prote
 
     override val originKind: LightClassOriginKind get() = LightClassOriginKind.SOURCE
 
-    override fun getQualifiedName(): String? = classOrObjectDeclaration?.fqName?.asString()
+    override fun getQualifiedName(): String? {
+        val classOrObjectFqName = classOrObjectDeclaration?.fqName
+            ?: withClassOrObjectSymbol { s -> s.classIdIfNonLocal?.asSingleFqName() }
+
+        return classOrObjectFqName?.toString()
+    }
 
     override fun getInterfaces(): Array<PsiClass> = PsiClassImplUtil.getInterfaces(this)
     override fun getSuperClass(): PsiClass? = PsiClassImplUtil.getSuperClass(this)

analysis/symbol-light-classes/tests/org/jetbrains/kotlin/light/classes/symbol/decompiled/SymbolLightClassesByFqNameForLibraryTestGenerated.java

@@ -616,5 +616,11 @@ public class SymbolLightClassesByFqNameForLibraryTestGenerated extends AbstractS
         public void testAllOpen() throws Exception {
             runTest("compiler/testData/asJava/lightClasses/lightClassByFqName/withTestCompilerPluginEnabled/allOpen.kt");
         }
+
+        @Test
+        @TestMetadata("companionWithFoo_companionTypeUsedInJava_ReferenceFromKotlin.kt")
+        public void testCompanionWithFoo_companionTypeUsedInJava_ReferenceFromKotlin() throws Exception {
+            runTest("compiler/testData/asJava/lightClasses/lightClassByFqName/withTestCompilerPluginEnabled/companionWithFoo_companionTypeUsedInJava_ReferenceFromKotlin.kt");
+        }
     }
 }

analysis/symbol-light-classes/tests/org/jetbrains/kotlin/light/classes/symbol/decompiled/SymbolLightClassesEqualityByFqNameForLibraryTestGenerated.java

@@ -616,5 +616,11 @@ public class SymbolLightClassesEqualityByFqNameForLibraryTestGenerated extends A
         public void testAllOpen() throws Exception {
             runTest("compiler/testData/asJava/lightClasses/lightClassByFqName/withTestCompilerPluginEnabled/allOpen.kt");
         }
+
+        @Test
+        @TestMetadata("companionWithFoo_companionTypeUsedInJava_ReferenceFromKotlin.kt")
+        public void testCompanionWithFoo_companionTypeUsedInJava_ReferenceFromKotlin() throws Exception {
+            runTest("compiler/testData/asJava/lightClasses/lightClassByFqName/withTestCompilerPluginEnabled/companionWithFoo_companionTypeUsedInJava_ReferenceFromKotlin.kt");
+        }
     }
 }

analysis/symbol-light-classes/tests/org/jetbrains/kotlin/light/classes/symbol/decompiled/SymbolLightClassesParentingByFqNameForLibraryTestGenerated.java

@@ -616,5 +616,11 @@ public class SymbolLightClassesParentingByFqNameForLibraryTestGenerated extends
         public void testAllOpen() throws Exception {
             runTest("compiler/testData/asJava/lightClasses/lightClassByFqName/withTestCompilerPluginEnabled/allOpen.kt");
         }
+
+        @Test
+        @TestMetadata("companionWithFoo_companionTypeUsedInJava_ReferenceFromKotlin.kt")
+        public void testCompanionWithFoo_companionTypeUsedInJava_ReferenceFromKotlin() throws Exception {
+            runTest("compiler/testData/asJava/lightClasses/lightClassByFqName/withTestCompilerPluginEnabled/companionWithFoo_companionTypeUsedInJava_ReferenceFromKotlin.kt");
+        }
     }
 }

analysis/symbol-light-classes/tests/org/jetbrains/kotlin/light/classes/symbol/source/SymbolLightClassesByFqNameForSourceTestGenerated.java

@@ -806,5 +806,11 @@ public class SymbolLightClassesByFqNameForSourceTestGenerated extends AbstractSy
         public void testAllOpen() throws Exception {
             runTest("compiler/testData/asJava/lightClasses/lightClassByFqName/withTestCompilerPluginEnabled/allOpen.kt");
         }
+
+        @Test
+        @TestMetadata("companionWithFoo_companionTypeUsedInJava_ReferenceFromKotlin.kt")
+        public void testCompanionWithFoo_companionTypeUsedInJava_ReferenceFromKotlin() throws Exception {
+            runTest("compiler/testData/asJava/lightClasses/lightClassByFqName/withTestCompilerPluginEnabled/companionWithFoo_companionTypeUsedInJava_ReferenceFromKotlin.kt");
+        }
     }
 }

analysis/symbol-light-classes/tests/org/jetbrains/kotlin/light/classes/symbol/source/SymbolLightClassesEqualityByFqNameForSourceTestGenerated.java

@@ -806,5 +806,11 @@ public class SymbolLightClassesEqualityByFqNameForSourceTestGenerated extends Ab
         public void testAllOpen() throws Exception {
             runTest("compiler/testData/asJava/lightClasses/lightClassByFqName/withTestCompilerPluginEnabled/allOpen.kt");
         }
+
+        @Test
+        @TestMetadata("companionWithFoo_companionTypeUsedInJava_ReferenceFromKotlin.kt")
+        public void testCompanionWithFoo_companionTypeUsedInJava_ReferenceFromKotlin() throws Exception {
+            runTest("compiler/testData/asJava/lightClasses/lightClassByFqName/withTestCompilerPluginEnabled/companionWithFoo_companionTypeUsedInJava_ReferenceFromKotlin.kt");
+        }
     }
 }

analysis/symbol-light-classes/tests/org/jetbrains/kotlin/light/classes/symbol/source/SymbolLightClassesParentingByFqNameForSourceTestGenerated.java

@@ -806,5 +806,11 @@ public class SymbolLightClassesParentingByFqNameForSourceTestGenerated extends A
         public void testAllOpen() throws Exception {
             runTest("compiler/testData/asJava/lightClasses/lightClassByFqName/withTestCompilerPluginEnabled/allOpen.kt");
         }
+
+        @Test
+        @TestMetadata("companionWithFoo_companionTypeUsedInJava_ReferenceFromKotlin.kt")
+        public void testCompanionWithFoo_companionTypeUsedInJava_ReferenceFromKotlin() throws Exception {
+            runTest("compiler/testData/asJava/lightClasses/lightClassByFqName/withTestCompilerPluginEnabled/companionWithFoo_companionTypeUsedInJava_ReferenceFromKotlin.kt");
+        }
     }
 }

compiler/testData/asJava/lightClasses/lightClassByFqName/withTestCompilerPluginEnabled/companionWithFoo_companionTypeUsedInJava_ReferenceFromKotlin.descriptors.java

@@ -0,0 +1,7 @@
+public final class TestClass /* test.TestClass*/ {
+  private final error.NonExistentClass usage;
+
+  public  TestClass();//  .ctor()
+
+  public final error.NonExistentClass getUsage();//  getUsage()
+}

compiler/testData/asJava/lightClasses/lightClassByFqName/withTestCompilerPluginEnabled/companionWithFoo_companionTypeUsedInJava_ReferenceFromKotlin.java

@@ -0,0 +1,7 @@
+public final class TestClass /* test.TestClass*/ {
+  private final MyClass.Companion usage;
+
+  public  TestClass();//  .ctor()
+
+  public final MyClass.Companion getUsage();//  getUsage()
+}

compiler/testData/asJava/lightClasses/lightClassByFqName/withTestCompilerPluginEnabled/companionWithFoo_companionTypeUsedInJava_ReferenceFromKotlin.kt

@@ -0,0 +1,26 @@
+// test.TestClass
+
+// Java code does not see declarations generated by compiler plugins, see KT-65454
+// COMPILATION_ERRORS
+
+// WITH_FIR_TEST_COMPILER_PLUGIN
+
+// FILE: main.kt
+package test
+
+import org.jetbrains.kotlin.fir.plugin.CompanionWithFoo
+
+@CompanionWithFoo
+class MyClass
+
+class TestClass {
+    val usage = CompanionProvider.provide()
+}
+
+// FILE: test/JavaClass.java
+package test;
+
+public class CompanionProvider {
+    // generated MyClass.Companion type reference in java
+    public static MyClass.Companion provide() { return null; }
+}

compiler/tests-gen/org/jetbrains/kotlin/asJava/CompilerLightClassTestGenerated.java

@@ -670,5 +670,10 @@ public class CompilerLightClassTestGenerated extends AbstractCompilerLightClassT
         public void testAllOpen() throws Exception {
             runTest("compiler/testData/asJava/lightClasses/lightClassByFqName/withTestCompilerPluginEnabled/allOpen.kt");
         }
+
+        @TestMetadata("companionWithFoo_companionTypeUsedInJava_ReferenceFromKotlin.kt")
+        public void testCompanionWithFoo_companionTypeUsedInJava_ReferenceFromKotlin() throws Exception {
+            runTest("compiler/testData/asJava/lightClasses/lightClassByFqName/withTestCompilerPluginEnabled/companionWithFoo_companionTypeUsedInJava_ReferenceFromKotlin.kt");
+        }
     }
 }