JVM IR: Generate synthetic final implementation methods in SAM wrappers

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

@@ -4353,6 +4353,11 @@ public class FirBytecodeTextTestGenerated extends AbstractFirBytecodeTextTest {
         public void testSamWrapperSyntheticFlags() throws Exception {
             runTest("compiler/testData/codegen/bytecodeText/sam/samWrapperSyntheticFlags.kt");
         }
+
+        @TestMetadata("samWrapperSyntheticImplementationMethod.kt")
+        public void testSamWrapperSyntheticImplementationMethod() throws Exception {
+            runTest("compiler/testData/codegen/bytecodeText/sam/samWrapperSyntheticImplementationMethod.kt");
+        }
     }
 
     @TestMetadata("compiler/testData/codegen/bytecodeText/statements")

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

@@ -209,7 +209,8 @@ abstract class SingleAbstractMethodLowering(val context: CommonBackendContext) :
             name = superMethod.name
             returnType = superMethod.returnType
             visibility = superMethod.visibility
-            origin = subclass.origin
+            modality = Modality.FINAL
+            origin = IrDeclarationOrigin.SYNTHETIC_GENERATED_SAM_IMPLEMENTATION
             isSuspend = superMethod.isSuspend
             setSourceRange(createFor)
         }.apply {

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

@@ -0,0 +1,21 @@
+// FILE: J.java
+
+public class J {
+    public static void g(Runnable r) {
+        r.run();
+    }
+}
+
+// FILE: test.kt
+
+fun nonInlineFun() {
+    val f = {}
+    J.g(f)
+}
+
+inline fun inlineFun() {
+    val f = {}
+    J.g(f)
+}
+
+// 2 public final synthetic run\(\)V

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

@@ -4425,6 +4425,11 @@ public class BytecodeTextTestGenerated extends AbstractBytecodeTextTest {
         public void testSamWrapperSyntheticFlags() throws Exception {
             runTest("compiler/testData/codegen/bytecodeText/sam/samWrapperSyntheticFlags.kt");
         }
+
+        @TestMetadata("samWrapperSyntheticImplementationMethod.kt")
+        public void testSamWrapperSyntheticImplementationMethod() throws Exception {
+            runTest("compiler/testData/codegen/bytecodeText/sam/samWrapperSyntheticImplementationMethod.kt");
+        }
     }
 
     @TestMetadata("compiler/testData/codegen/bytecodeText/statements")

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

@@ -4353,6 +4353,11 @@ public class IrBytecodeTextTestGenerated extends AbstractIrBytecodeTextTest {
         public void testSamWrapperSyntheticFlags() throws Exception {
             runTest("compiler/testData/codegen/bytecodeText/sam/samWrapperSyntheticFlags.kt");
         }
+
+        @TestMetadata("samWrapperSyntheticImplementationMethod.kt")
+        public void testSamWrapperSyntheticImplementationMethod() throws Exception {
+            runTest("compiler/testData/codegen/bytecodeText/sam/samWrapperSyntheticImplementationMethod.kt");
+        }
     }
 
     @TestMetadata("compiler/testData/codegen/bytecodeText/statements")