Fix generation of property accessor to the underlying value

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

@@ -239,20 +239,12 @@ public class FunctionCodegen {
                 !(containingDeclaration instanceof PackageFragmentDescriptor) &&
                 origin.getOriginKind() != JvmDeclarationOriginKind.CLASS_MEMBER_DELEGATION_TO_DEFAULT_IMPL;
 
-        boolean isMethodInInlineClassWrapper =
-                isClass(containingDeclaration) &&
-                ((ClassDescriptor) containingDeclaration).isInline() &&
-                contextKind != OwnerKind.ERASED_INLINE_CLASS &&
-                !(functionDescriptor instanceof ConstructorDescriptor) &&
-                !KotlinTypeMapper.isAccessor(functionDescriptor) &&
-                origin.getOriginKind() != JvmDeclarationOriginKind.UNBOX_METHOD_OF_INLINE_CLASS;
-
         if (isOpenSuspendInClass) {
             generateOpenMethodInSuspendClass(
                     origin, functionDescriptor, methodContext, strategy, mv, jvmSignature, asmMethod, flags, staticInCompanionObject
             );
         }
-        else if (isMethodInInlineClassWrapper) {
+        else if (shouldDelegateMethodBodyToInlineClass(origin, functionDescriptor, contextKind, containingDeclaration, bindingContext)) {
             generateMethodInsideInlineClassWrapper(origin, functionDescriptor, (ClassDescriptor) containingDeclaration, mv);
         }
         else {
@@ -262,6 +254,34 @@ public class FunctionCodegen {
         }
     }
 
+    private static boolean shouldDelegateMethodBodyToInlineClass(
+            @NotNull JvmDeclarationOrigin origin,
+            @NotNull FunctionDescriptor functionDescriptor,
+            @NotNull OwnerKind contextKind,
+            @NotNull DeclarationDescriptor containingDeclaration,
+            @NotNull BindingContext bindingContext
+    ) {
+        // special kind / function
+        if (contextKind == OwnerKind.ERASED_INLINE_CLASS) return false;
+        if (origin.getOriginKind() == JvmDeclarationOriginKind.UNBOX_METHOD_OF_INLINE_CLASS) return false;
+
+        // descriptor corresponds to the underlying value
+        if (functionDescriptor instanceof PropertyAccessorDescriptor) {
+            PropertyDescriptor property = ((PropertyAccessorDescriptor) functionDescriptor).getCorrespondingProperty();
+            // property for the underlying value
+            if (JvmCodegenUtil.hasBackingField(property, contextKind, bindingContext)) {
+                return false;
+            }
+        }
+
+        // base check
+        boolean isInlineClass = isClass(containingDeclaration) && ((ClassDescriptor) containingDeclaration).isInline();
+        boolean simpleFunctionOrProperty =
+                !(functionDescriptor instanceof ConstructorDescriptor) && !KotlinTypeMapper.isAccessor(functionDescriptor);
+
+        return isInlineClass && simpleFunctionOrProperty;
+    }
+
     private void generateMethodInsideInlineClassWrapper(
             @NotNull JvmDeclarationOrigin origin,
             @NotNull FunctionDescriptor functionDescriptor,

compiler/testData/codegen/bytecodeText/inlineClasses/generationOfAccessorToUnderlyingValue.kt

@@ -0,0 +1,8 @@
+// !LANGUAGE: +InlineClasses
+
+inline class UInt(val value: Int)
+
+// 0 INVOKESTATIC UInt\$Erased.getValue
+
+// 0 valueOf
+// 0 intValue

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

@@ -1944,6 +1944,12 @@ public class BytecodeTextTestGenerated extends AbstractBytecodeTextTest {
             doTest(fileName);
         }
 
+        @TestMetadata("generationOfAccessorToUnderlyingValue.kt")
+        public void testGenerationOfAccessorToUnderlyingValue() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/bytecodeText/inlineClasses/generationOfAccessorToUnderlyingValue.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("inlineClassBoxingOnAssignment.kt")
         public void testInlineClassBoxingOnAssignment() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/bytecodeText/inlineClasses/inlineClassBoxingOnAssignment.kt");