JVM IR: Generate SAM wrapper fields as synthetic final

compiler/fir/fir2ir/tests/org/jetbrains/kotlin/codegen/ir/FirBytecodeTextTestGenerated.java

@@ -4339,6 +4339,11 @@ public class FirBytecodeTextTestGenerated extends AbstractFirBytecodeTextTest {
             runTest("compiler/testData/codegen/bytecodeText/sam/samWrapperOfReference.kt");
         }
 
+        @TestMetadata("samWrapperPrivateFinalSyntheticField.kt")
+        public void testSamWrapperPrivateFinalSyntheticField() throws Exception {
+            runTest("compiler/testData/codegen/bytecodeText/sam/samWrapperPrivateFinalSyntheticField.kt");
+        }
+
         @TestMetadata("samWrapperSyntheticFlags.kt")
         public void testSamWrapperSyntheticFlags() throws Exception {
             runTest("compiler/testData/codegen/bytecodeText/sam/samWrapperSyntheticFlags.kt");

compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/SingleAbstractMethodLowering.kt

@@ -177,8 +177,9 @@ abstract class SingleAbstractMethodLowering(val context: CommonBackendContext) :
         val field = subclass.addField {
             name = Name.identifier(FUNCTION_FIELD_NAME)
             type = wrappedFunctionType
-            origin = subclass.origin
+            origin = IrDeclarationOrigin.SYNTHETIC_GENERATED_SAM_IMPLEMENTATION
             visibility = DescriptorVisibilities.PRIVATE
+            isFinal = true
             setSourceRange(createFor)
         }
 

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/declarations/IrDeclarationOrigin.kt

@@ -69,6 +69,7 @@ interface IrDeclarationOrigin {
     object ADAPTER_PARAMETER_FOR_SUSPEND_CONVERSION : IrDeclarationOriginImpl("ADAPTER_PARAMETER_FOR_SUSPEND_CONVERSION")
 
     object GENERATED_SAM_IMPLEMENTATION : IrDeclarationOriginImpl("GENERATED_SAM_IMPLEMENTATION")
+    object SYNTHETIC_GENERATED_SAM_IMPLEMENTATION : IrDeclarationOriginImpl("SYNTHETIC_GENERATED_SAM_IMPLEMENTATION", isSynthetic = true)
 
     val isSynthetic: Boolean get() = false
 }

compiler/testData/codegen/bytecodeText/sam/samWrapperPrivateFinalSyntheticField.kt

@@ -0,0 +1,16 @@
+// FILE: J.java
+
+public class J {
+    public static void g(Runnable r) {
+        r.run();
+    }
+}
+
+// FILE: test.kt
+
+fun f() {
+    val r: () -> Unit = {}
+    J.g(r)
+}
+
+// 1 private final synthetic Lkotlin/jvm/functions/Function0; function

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

@@ -4411,6 +4411,11 @@ public class BytecodeTextTestGenerated extends AbstractBytecodeTextTest {
             runTest("compiler/testData/codegen/bytecodeText/sam/samWrapperOfReference.kt");
         }
 
+        @TestMetadata("samWrapperPrivateFinalSyntheticField.kt")
+        public void testSamWrapperPrivateFinalSyntheticField() throws Exception {
+            runTest("compiler/testData/codegen/bytecodeText/sam/samWrapperPrivateFinalSyntheticField.kt");
+        }
+
         @TestMetadata("samWrapperSyntheticFlags.kt")
         public void testSamWrapperSyntheticFlags() throws Exception {
             runTest("compiler/testData/codegen/bytecodeText/sam/samWrapperSyntheticFlags.kt");

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

@@ -4339,6 +4339,11 @@ public class IrBytecodeTextTestGenerated extends AbstractIrBytecodeTextTest {
             runTest("compiler/testData/codegen/bytecodeText/sam/samWrapperOfReference.kt");
         }
 
+        @TestMetadata("samWrapperPrivateFinalSyntheticField.kt")
+        public void testSamWrapperPrivateFinalSyntheticField() throws Exception {
+            runTest("compiler/testData/codegen/bytecodeText/sam/samWrapperPrivateFinalSyntheticField.kt");
+        }
+
         @TestMetadata("samWrapperSyntheticFlags.kt")
         public void testSamWrapperSyntheticFlags() throws Exception {
             runTest("compiler/testData/codegen/bytecodeText/sam/samWrapperSyntheticFlags.kt");