Fix companion method access from inline class

#KT-27025

compiler/backend/src/org/jetbrains/kotlin/codegen/ImplementationBodyCodegen.java

@@ -253,10 +253,7 @@ public class ImplementationBodyCodegen extends ClassBodyCodegen {
         if (!(myClass instanceof KtClass)) return;
         if (!descriptor.isInline()) return;
 
-        CodegenContext parentContext = context.getParentContext();
+        ClassContext erasedInlineClassContext = context.intoWrapperForErasedInlineClass(descriptor, state);
-        assert parentContext != null : "Parent context of inline class declaration should not be null";
-
-        ClassContext erasedInlineClassContext = parentContext.intoWrapperForErasedInlineClass(descriptor, state);
         new ErasedInlineClassBodyCodegen((KtClass) myClass, erasedInlineClassContext, v, state, this).generate();
     }
 
@@ -270,7 +267,7 @@ public class ImplementationBodyCodegen extends ClassBodyCodegen {
         if (inlinedValue == null) return;
 
         Type valueType = typeMapper.mapType(inlinedValue.getType());
-        SimpleFunctionDescriptor functionDescriptor = InlineClassDescriptorResolver.INSTANCE.createUnboxFunctionDescriptor(this.descriptor);
+        SimpleFunctionDescriptor functionDescriptor = InlineClassDescriptorResolver.createUnboxFunctionDescriptor(this.descriptor);
         assert functionDescriptor != null : "FunctionDescriptor for unbox method should be not null during codegen";
 
         functionCodegen.generateMethod(

compiler/backend/src/org/jetbrains/kotlin/codegen/context/CodegenContext.java

@@ -393,12 +393,16 @@ public abstract class CodegenContext<T extends DeclarationDescriptor> {
     public CodegenContext findParentContextWithDescriptor(DeclarationDescriptor descriptor) {
         CodegenContext c = this;
         while (c != null) {
-            if (c.getContextDescriptor() == descriptor) break;
+            if (!c.shouldSkipThisContextInHierarchy() && c.getContextDescriptor() == descriptor) break;
             c = c.getParentContext();
         }
         return c;
     }
 
+    private boolean shouldSkipThisContextInHierarchy() {
+        return getContextKind() == OwnerKind.ERASED_INLINE_CLASS;
+    }
+
     @NotNull
     private PropertyDescriptor getPropertyAccessor(
             @NotNull PropertyDescriptor propertyDescriptor,

compiler/testData/codegen/box/inlineClasses/membersAccess/toPrivateCompanionFun.kt

@@ -0,0 +1,12 @@
+// !LANGUAGE: +InlineClasses
+// IGNORE_BACKEND: JVM_IR
+
+inline class R(private val r: Int) {
+    fun test() = pf()
+
+    companion object {
+        private fun pf() = "OK"
+    }
+}
+
+fun box() = R(0).test()

compiler/tests/org/jetbrains/kotlin/codegen/BlackBoxCodegenTestGenerated.java

@@ -12120,6 +12120,11 @@ public class BlackBoxCodegenTestGenerated extends AbstractBlackBoxCodegenTest {
                 KotlinTestUtils.assertAllTestsPresentByMetadata(this.getClass(), new File("compiler/testData/codegen/box/inlineClasses/membersAccess"), Pattern.compile("^(.+)\\.kt$"), TargetBackend.JVM, true);
             }
 
+            @TestMetadata("toPrivateCompanionFun.kt")
+            public void testToPrivateCompanionFun() throws Exception {
+                runTest("compiler/testData/codegen/box/inlineClasses/membersAccess/toPrivateCompanionFun.kt");
+            }
+
             @TestMetadata("toPrivateCompanionVal.kt")
             public void testToPrivateCompanionVal() throws Exception {
                 runTest("compiler/testData/codegen/box/inlineClasses/membersAccess/toPrivateCompanionVal.kt");

compiler/tests/org/jetbrains/kotlin/codegen/LightAnalysisModeTestGenerated.java

@@ -12120,6 +12120,11 @@ public class LightAnalysisModeTestGenerated extends AbstractLightAnalysisModeTes
                 KotlinTestUtils.assertAllTestsPresentByMetadata(this.getClass(), new File("compiler/testData/codegen/box/inlineClasses/membersAccess"), Pattern.compile("^(.+)\\.kt$"), TargetBackend.JVM, true);
             }
 
+            @TestMetadata("toPrivateCompanionFun.kt")
+            public void testToPrivateCompanionFun() throws Exception {
+                runTest("compiler/testData/codegen/box/inlineClasses/membersAccess/toPrivateCompanionFun.kt");
+            }
+
             @TestMetadata("toPrivateCompanionVal.kt")
             public void testToPrivateCompanionVal() throws Exception {
                 runTest("compiler/testData/codegen/box/inlineClasses/membersAccess/toPrivateCompanionVal.kt");

compiler/tests/org/jetbrains/kotlin/codegen/ir/IrBlackBoxCodegenTestGenerated.java

@@ -12125,6 +12125,11 @@ public class IrBlackBoxCodegenTestGenerated extends AbstractIrBlackBoxCodegenTes
                 KotlinTestUtils.assertAllTestsPresentByMetadata(this.getClass(), new File("compiler/testData/codegen/box/inlineClasses/membersAccess"), Pattern.compile("^(.+)\\.kt$"), TargetBackend.JVM_IR, true);
             }
 
+            @TestMetadata("toPrivateCompanionFun.kt")
+            public void testToPrivateCompanionFun() throws Exception {
+                runTest("compiler/testData/codegen/box/inlineClasses/membersAccess/toPrivateCompanionFun.kt");
+            }
+
             @TestMetadata("toPrivateCompanionVal.kt")
             public void testToPrivateCompanionVal() throws Exception {
                 runTest("compiler/testData/codegen/box/inlineClasses/membersAccess/toPrivateCompanionVal.kt");

js/js.tests/test/org/jetbrains/kotlin/js/test/semantics/IrJsCodegenBoxTestGenerated.java

@@ -10660,6 +10660,11 @@ public class IrJsCodegenBoxTestGenerated extends AbstractIrJsCodegenBoxTest {
                 KotlinTestUtils.assertAllTestsPresentByMetadata(this.getClass(), new File("compiler/testData/codegen/box/inlineClasses/membersAccess"), Pattern.compile("^(.+)\\.kt$"), TargetBackend.JS_IR, true);
             }
 
+            @TestMetadata("toPrivateCompanionFun.kt")
+            public void testToPrivateCompanionFun() throws Exception {
+                runTest("compiler/testData/codegen/box/inlineClasses/membersAccess/toPrivateCompanionFun.kt");
+            }
+
             @TestMetadata("toPrivateCompanionVal.kt")
             public void testToPrivateCompanionVal() throws Exception {
                 runTest("compiler/testData/codegen/box/inlineClasses/membersAccess/toPrivateCompanionVal.kt");

js/js.tests/test/org/jetbrains/kotlin/js/test/semantics/JsCodegenBoxTestGenerated.java

@@ -11705,6 +11705,11 @@ public class JsCodegenBoxTestGenerated extends AbstractJsCodegenBoxTest {
                 KotlinTestUtils.assertAllTestsPresentByMetadata(this.getClass(), new File("compiler/testData/codegen/box/inlineClasses/membersAccess"), Pattern.compile("^(.+)\\.kt$"), TargetBackend.JS, true);
             }
 
+            @TestMetadata("toPrivateCompanionFun.kt")
+            public void testToPrivateCompanionFun() throws Exception {
+                runTest("compiler/testData/codegen/box/inlineClasses/membersAccess/toPrivateCompanionFun.kt");
+            }
+
             @TestMetadata("toPrivateCompanionVal.kt")
             public void testToPrivateCompanionVal() throws Exception {
                 runTest("compiler/testData/codegen/box/inlineClasses/membersAccess/toPrivateCompanionVal.kt");