Don't generate private members in interface

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

@@ -310,11 +310,11 @@ public class AsmUtil {
     @Nullable
     private static Integer specialCaseVisibility(@NotNull MemberDescriptor memberDescriptor) {
         DeclarationDescriptor containingDeclaration = memberDescriptor.getContainingDeclaration();
+        Visibility memberVisibility = memberDescriptor.getVisibility();
         if (isInterface(containingDeclaration)) {
-            return ACC_PUBLIC;
+            return memberVisibility == Visibilities.PRIVATE ? NO_FLAG_PACKAGE_PRIVATE : ACC_PUBLIC;
         }
 
-        Visibility memberVisibility = memberDescriptor.getVisibility();
         if (memberVisibility == Visibilities.LOCAL && memberDescriptor instanceof CallableMemberDescriptor) {
             return ACC_PUBLIC;
         }

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

@@ -142,6 +142,12 @@ public class FunctionCodegen {
             @NotNull FunctionGenerationStrategy strategy
     ) {
         OwnerKind contextKind = methodContext.getContextKind();
+        if (isTrait(functionDescriptor.getContainingDeclaration()) &&
+            functionDescriptor.getVisibility() == Visibilities.PRIVATE &&
+            contextKind != OwnerKind.TRAIT_IMPL) {
+            return;
+        }
+
         JvmMethodSignature jvmSignature = typeMapper.mapSignature(functionDescriptor, contextKind);
         Method asmMethod = jvmSignature.getAsmMethod();
 
@@ -577,9 +583,7 @@ public class FunctionCodegen {
     ) {
         DeclarationDescriptor contextClass = owner.getContextDescriptor().getContainingDeclaration();
 
-        if (kind != OwnerKind.TRAIT_IMPL &&
+        if (kind != OwnerKind.TRAIT_IMPL && isTrait(contextClass)) {
-            contextClass instanceof ClassDescriptor &&
-            ((ClassDescriptor) contextClass).getKind() == ClassKind.INTERFACE) {
             return;
         }
 

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

@@ -55,6 +55,7 @@ import java.io.File;
 
 import static org.jetbrains.kotlin.descriptors.Modality.ABSTRACT;
 import static org.jetbrains.kotlin.descriptors.Modality.FINAL;
+import static org.jetbrains.kotlin.resolve.DescriptorUtils.isTrait;
 
 public class JvmCodegenUtil {
 

compiler/backend/src/org/jetbrains/kotlin/codegen/state/JetTypeMapper.java

@@ -58,11 +58,9 @@ import org.jetbrains.kotlin.resolve.jvm.jvmSignature.JvmMethodParameterKind;
 import org.jetbrains.kotlin.resolve.jvm.jvmSignature.JvmMethodParameterSignature;
 import org.jetbrains.kotlin.resolve.jvm.jvmSignature.JvmMethodSignature;
 import org.jetbrains.kotlin.resolve.scopes.AbstractScopeAdapter;
-import org.jetbrains.kotlin.resolve.scopes.ChainedScope;
 import org.jetbrains.kotlin.resolve.scopes.JetScope;
 import org.jetbrains.kotlin.serialization.deserialization.DeserializedType;
 import org.jetbrains.kotlin.serialization.deserialization.descriptors.DeserializedCallableMemberDescriptor;
-import org.jetbrains.kotlin.serialization.deserialization.descriptors.DeserializedPackageMemberScope;
 import org.jetbrains.kotlin.types.*;
 import org.jetbrains.kotlin.types.expressions.OperatorConventions;
 import org.jetbrains.org.objectweb.asm.Type;
@@ -625,7 +623,7 @@ public class JetTypeMapper {
             ownerForDefaultParam = mapClass(ownerForDefault);
             ownerForDefaultImpl = isInterface(ownerForDefault) ? mapTraitImpl(ownerForDefault) : ownerForDefaultParam;
 
-            if (isInterface && superCall) {
+            if (isInterface && (superCall || descriptor.getVisibility() == Visibilities.PRIVATE)) {
                 thisClass = mapClass(currentOwner);
                 if (declarationOwner instanceof JavaClassDescriptor) {
                     invokeOpcode = INVOKESPECIAL;

compiler/testData/asJava/lightClasses/nullabilityAnnotations/PrivateInTrait.java

@@ -1,12 +1,2 @@
 public interface PrivateInTrait {
-    @org.jetbrains.annotations.NotNull
-    java.lang.String getNn();
-
-    void setNn(@org.jetbrains.annotations.NotNull java.lang.String value);
-
-    @org.jetbrains.annotations.Nullable
-    java.lang.String getN();
-
-    @org.jetbrains.annotations.Nullable
-    java.lang.String bar(@org.jetbrains.annotations.NotNull java.lang.String a, @org.jetbrains.annotations.Nullable java.lang.String b);
 }

compiler/testData/codegen/box/traits/traitWithPrivateMember.kt

@@ -0,0 +1,26 @@
+interface Z {
+
+    fun testFun() : String {
+        return privateFun()
+    }
+
+    fun testProperty() : String {
+        return privateProp
+    }
+
+    private fun privateFun(): String {
+        return "O"
+    }
+
+    private val privateProp: String
+        get() = "K"
+}
+
+object Z2 : Z {
+
+}
+
+fun box() : String {
+    return Z2.testFun() + Z2.testProperty()
+}
+

compiler/testData/codegen/box/traits/traitWithPrivateMemberAccessFromLambda.kt

@@ -0,0 +1,26 @@
+interface Z {
+
+    fun testFun(): String {
+        return { privateFun() } ()
+    }
+
+    fun testProperty(): String {
+        return { privateProp } ()
+    }
+
+    private fun privateFun(): String {
+        return "O"
+    }
+
+    private val privateProp: String
+        get() = "K"
+}
+
+object Z2 : Z {
+
+}
+
+fun box(): String {
+    return Z2.testFun() + Z2.testProperty()
+}
+

compiler/testData/codegen/bytecodeText/interfaces/noPrivateMemberInJavaInterface.kt

@@ -0,0 +1,17 @@
+interface A {
+
+    private val prop: String
+        get() = "1"
+
+    private fun foo() {
+
+    }
+
+    private fun defaultFun(p: String = "OK") {
+
+    }
+}
+
+// 1 foo
+// 1 getProp
+// 1 defaultFun\$

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

@@ -544,6 +544,12 @@ public class BytecodeTextTestGenerated extends AbstractBytecodeTextTest {
             doTest(fileName);
         }
 
+        @TestMetadata("noPrivateMemberInJavaInterface.kt")
+        public void testNoPrivateMemberInJavaInterface() throws Exception {
+            String fileName = JetTestUtils.navigationMetadata("compiler/testData/codegen/bytecodeText/interfaces/noPrivateMemberInJavaInterface.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("traitImplGeneratedOnce.kt")
         public void testTraitImplGeneratedOnce() throws Exception {
             String fileName = JetTestUtils.navigationMetadata("compiler/testData/codegen/bytecodeText/interfaces/traitImplGeneratedOnce.kt");

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

@@ -7593,6 +7593,18 @@ public class BlackBoxCodegenTestGenerated extends AbstractBlackBoxCodegenTest {
             String fileName = JetTestUtils.navigationMetadata("compiler/testData/codegen/box/traits/traitWithPrivateExtension.kt");
             doTest(fileName);
         }
+
+        @TestMetadata("traitWithPrivateMember.kt")
+        public void testTraitWithPrivateMember() throws Exception {
+            String fileName = JetTestUtils.navigationMetadata("compiler/testData/codegen/box/traits/traitWithPrivateMember.kt");
+            doTest(fileName);
+        }
+
+        @TestMetadata("traitWithPrivateMemberAccessFromLambda.kt")
+        public void testTraitWithPrivateMemberAccessFromLambda() throws Exception {
+            String fileName = JetTestUtils.navigationMetadata("compiler/testData/codegen/box/traits/traitWithPrivateMemberAccessFromLambda.kt");
+            doTest(fileName);
+        }
     }
 
     @TestMetadata("compiler/testData/codegen/box/typeInfo")