Support interface delegation to inline class values (KT-27318)

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

@@ -1582,10 +1582,13 @@ public class FunctionCodegen {
                             reg += argTypes[i].getSize();
                         }
 
-                        String internalName = typeMapper.mapType(toClass).getInternalName();
+                        String internalName = typeMapper.mapClass(toClass).getInternalName();
                         if (toClass.getKind() == ClassKind.INTERFACE) {
                             iv.invokeinterface(internalName, delegateToMethod.getName(), delegateToMethod.getDescriptor());
                         }
+                        else if (toClass.isInline()) {
+                            iv.invokestatic(internalName, delegateToMethod.getName(), delegateToMethod.getDescriptor(), false);
+                        }
                         else {
                             iv.invokevirtual(internalName, delegateToMethod.getName(), delegateToMethod.getDescriptor(), false);
                         }

compiler/testData/codegen/box/inlineClasses/interfaceImplementationByDelegation.kt

@@ -0,0 +1,18 @@
+// !LANGUAGE: +InlineClasses
+// IGNORE_BACKEND: JVM_IR
+
+interface IFoo {
+    fun getO(): String
+    val k: String
+
+    val ok: String get() = getO() + k
+}
+
+inline class InlineFooImpl(val s: String): IFoo {
+    override fun getO(): String = s
+    override val k: String get() = "K"
+}
+
+class Test(s: String) : IFoo by InlineFooImpl(s)
+
+fun box() = Test("O").ok

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

@@ -11769,6 +11769,11 @@ public class BlackBoxCodegenTestGenerated extends AbstractBlackBoxCodegenTest {
             runTest("compiler/testData/codegen/box/inlineClasses/inlineFunctionInsideInlineClass.kt");
         }
 
+        @TestMetadata("interfaceImplementationByDelegation.kt")
+        public void testInterfaceImplementationByDelegation() throws Exception {
+            runTest("compiler/testData/codegen/box/inlineClasses/interfaceImplementationByDelegation.kt");
+        }
+
         @TestMetadata("iterateOverArrayOfInlineClassValues.kt")
         public void testIterateOverArrayOfInlineClassValues() throws Exception {
             runTest("compiler/testData/codegen/box/inlineClasses/iterateOverArrayOfInlineClassValues.kt");

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

@@ -11769,6 +11769,11 @@ public class LightAnalysisModeTestGenerated extends AbstractLightAnalysisModeTes
             runTest("compiler/testData/codegen/box/inlineClasses/inlineFunctionInsideInlineClass.kt");
         }
 
+        @TestMetadata("interfaceImplementationByDelegation.kt")
+        public void testInterfaceImplementationByDelegation() throws Exception {
+            runTest("compiler/testData/codegen/box/inlineClasses/interfaceImplementationByDelegation.kt");
+        }
+
         @TestMetadata("iterateOverArrayOfInlineClassValues.kt")
         public void testIterateOverArrayOfInlineClassValues() throws Exception {
             runTest("compiler/testData/codegen/box/inlineClasses/iterateOverArrayOfInlineClassValues.kt");

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

@@ -11774,6 +11774,11 @@ public class IrBlackBoxCodegenTestGenerated extends AbstractIrBlackBoxCodegenTes
             runTest("compiler/testData/codegen/box/inlineClasses/inlineFunctionInsideInlineClass.kt");
         }
 
+        @TestMetadata("interfaceImplementationByDelegation.kt")
+        public void testInterfaceImplementationByDelegation() throws Exception {
+            runTest("compiler/testData/codegen/box/inlineClasses/interfaceImplementationByDelegation.kt");
+        }
+
         @TestMetadata("iterateOverArrayOfInlineClassValues.kt")
         public void testIterateOverArrayOfInlineClassValues() throws Exception {
             runTest("compiler/testData/codegen/box/inlineClasses/iterateOverArrayOfInlineClassValues.kt");

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

@@ -10309,6 +10309,11 @@ public class IrJsCodegenBoxTestGenerated extends AbstractIrJsCodegenBoxTest {
             runTest("compiler/testData/codegen/box/inlineClasses/inlineFunctionInsideInlineClass.kt");
         }
 
+        @TestMetadata("interfaceImplementationByDelegation.kt")
+        public void testInterfaceImplementationByDelegation() throws Exception {
+            runTest("compiler/testData/codegen/box/inlineClasses/interfaceImplementationByDelegation.kt");
+        }
+
         @TestMetadata("iterateOverArrayOfInlineClassValues.kt")
         public void testIterateOverArrayOfInlineClassValues() throws Exception {
             runTest("compiler/testData/codegen/box/inlineClasses/iterateOverArrayOfInlineClassValues.kt");

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

@@ -11354,6 +11354,11 @@ public class JsCodegenBoxTestGenerated extends AbstractJsCodegenBoxTest {
             runTest("compiler/testData/codegen/box/inlineClasses/inlineFunctionInsideInlineClass.kt");
         }
 
+        @TestMetadata("interfaceImplementationByDelegation.kt")
+        public void testInterfaceImplementationByDelegation() throws Exception {
+            runTest("compiler/testData/codegen/box/inlineClasses/interfaceImplementationByDelegation.kt");
+        }
+
         @TestMetadata("iterateOverArrayOfInlineClassValues.kt")
         public void testIterateOverArrayOfInlineClassValues() throws Exception {
             runTest("compiler/testData/codegen/box/inlineClasses/iterateOverArrayOfInlineClassValues.kt");