Fix for KT-11969: ProGuard issue with private interface methods

#KT-11969 Fixed

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

@@ -133,7 +133,7 @@ public class FunctionCodegen {
                            new FunctionGenerationStrategy.FunctionDefault(state, function));
         }
 
-        generateDefaultIfNeeded(owner.intoFunction(functionDescriptor), functionDescriptor, owner.getContextKind(),
+        generateDefaultIfNeeded(owner.intoFunction(functionDescriptor, true), functionDescriptor, owner.getContextKind(),
                                 DefaultParameterValueLoader.DEFAULT, function);
 
         generateOverloadsWithDefaultValues(function, functionDescriptor, functionDescriptor);

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

@@ -66,6 +66,8 @@ import org.jetbrains.org.objectweb.asm.commons.Method;
 import java.util.*;
 
 import static org.jetbrains.kotlin.codegen.AsmUtil.*;
+import static org.jetbrains.kotlin.codegen.JvmCodegenUtil.isJvm8Interface;
+import static org.jetbrains.kotlin.codegen.JvmCodegenUtil.isJvm8InterfaceMember;
 import static org.jetbrains.kotlin.descriptors.CallableMemberDescriptor.Kind.SYNTHESIZED;
 import static org.jetbrains.kotlin.resolve.BindingContext.PROVIDE_DELEGATE_RESOLVED_CALL;
 import static org.jetbrains.kotlin.resolve.BindingContext.TYPE_ALIAS;
@@ -375,7 +377,14 @@ public abstract class MemberCodegen<T extends KtPureElement/* TODO: & KtDeclarat
     private Type computeOuterClass(@NotNull CodegenContext<?> context) {
         CodegenContext<? extends ClassOrPackageFragmentDescriptor> outermost = context.getClassOrPackageParentContext();
         if (outermost instanceof ClassContext) {
-            return typeMapper.mapType(((ClassContext) outermost).getContextDescriptor());
+            ClassDescriptor classDescriptor = ((ClassContext) outermost).getContextDescriptor();
+            if (context instanceof MethodContext) {
+                FunctionDescriptor functionDescriptor = ((MethodContext) context).getFunctionDescriptor();
+                if (isInterface(functionDescriptor.getContainingDeclaration()) && !isJvm8InterfaceMember(functionDescriptor, state)) {
+                    return typeMapper.mapDefaultImpls(classDescriptor);
+                }
+            }
+            return typeMapper.mapType(classDescriptor);
         }
         else if (outermost instanceof MultifileClassFacadeContext || outermost instanceof DelegatingToPartContext) {
             Type implementationOwnerType = CodegenContextUtil.getImplementationOwnerClassType(outermost);
@@ -393,10 +402,17 @@ public abstract class MemberCodegen<T extends KtPureElement/* TODO: & KtDeclarat
     @Nullable
     private Method computeEnclosingMethod(@NotNull CodegenContext context) {
         if (context instanceof MethodContext) {
-            Method method = typeMapper.mapAsmMethod(((MethodContext) context).getFunctionDescriptor());
+            FunctionDescriptor functionDescriptor = ((MethodContext) context).getFunctionDescriptor();
-            if (!method.getName().equals("<clinit>")) {
+            if ("<clinit>".equals(functionDescriptor.getName().asString())) {
-                return method;
+                return null;
             }
+
+            if (((MethodContext) context).isDefaultFunctionContext()) {
+                return typeMapper.mapDefaultMethod(functionDescriptor, context.getContextKind());
+            }
+
+            return typeMapper.mapAsmMethod(functionDescriptor, context.getContextKind());
+
         }
         return null;
     }

compiler/backend/src/org/jetbrains/kotlin/codegen/context/CodegenContext.java

@@ -299,9 +299,14 @@ public abstract class CodegenContext<T extends DeclarationDescriptor> {
         return new AnonymousClassContext(codegen.getState().getTypeMapper(), descriptor, ownerKind, this, codegen);
     }
 
+    @NotNull
+    public MethodContext intoFunction(FunctionDescriptor descriptor, boolean isDefaultFunctionContext) {
+        return new MethodContext(descriptor, getContextKind(), this, null, isDefaultFunctionContext);
+    }
+
     @NotNull
     public MethodContext intoFunction(FunctionDescriptor descriptor) {
-        return new MethodContext(descriptor, getContextKind(), this, null);
+        return intoFunction(descriptor, false);
     }
 
     @NotNull

compiler/backend/src/org/jetbrains/kotlin/codegen/context/ConstructorContext.java

@@ -34,7 +34,7 @@ public class ConstructorContext extends MethodContext {
             @NotNull CodegenContext parent,
             @Nullable MutableClosure closure
     ) {
-        super(contextDescriptor, kind, parent, closure);
+        super(contextDescriptor, kind, parent, closure, false);
     }
 
     @Override

compiler/backend/src/org/jetbrains/kotlin/codegen/context/InlineLambdaContext.kt

@@ -27,7 +27,7 @@ class InlineLambdaContext(
         closure: MutableClosure?,
         val isCrossInline: Boolean,
         val isPropertyReference: Boolean
-) : MethodContext(functionDescriptor, contextKind, parentContext, closure) {
+) : MethodContext(functionDescriptor, contextKind, parentContext, closure, false) {
 
     override fun getFirstCrossInlineOrNonInlineContext(): CodegenContext<*> {
         if (isCrossInline) return this

compiler/backend/src/org/jetbrains/kotlin/codegen/context/MethodContext.java

@@ -39,16 +39,19 @@ public class MethodContext extends CodegenContext<CallableMemberDescriptor> {
     // Note: in case of code inside property accessors, functionDescriptor will be that accessor,
     // but CodegenContext#contextDescriptor will be the corresponding property
     private final FunctionDescriptor functionDescriptor;
+    private final boolean isDefaultFunctionContext;
 
     protected MethodContext(
             @NotNull FunctionDescriptor functionDescriptor,
             @NotNull OwnerKind contextKind,
             @NotNull CodegenContext parentContext,
-            @Nullable MutableClosure closure
+            @Nullable MutableClosure closure,
+            boolean isDefaultFunctionContext
     ) {
         super(JvmCodegenUtil.getDirectMember(functionDescriptor), contextKind, parentContext, closure,
               parentContext.hasThisDescriptor() ? parentContext.getThisDescriptor() : null, null);
         this.functionDescriptor = functionDescriptor;
+        this.isDefaultFunctionContext = isDefaultFunctionContext;
     }
 
     @NotNull
@@ -126,4 +129,8 @@ public class MethodContext extends CodegenContext<CallableMemberDescriptor> {
     public FunctionDescriptor getFunctionDescriptor() {
         return functionDescriptor;
     }
+
+    public boolean isDefaultFunctionContext() {
+        return isDefaultFunctionContext;
+    }
 }

compiler/testData/codegen/box/reflection/enclosing/kt11969.kt

@@ -0,0 +1,63 @@
+// WITH_RUNTIME
+// IGNORE_BACKEND: JS
+
+interface Z {
+    private fun privateFun() = { "OK" }
+
+    fun callPrivateFun() = privateFun()
+
+    fun publicFun() = { "OK" }
+
+    fun funWithDefaultArgs(s: () -> Unit = {}): () -> Unit
+
+    val property: () -> Unit
+        get() = {}
+
+    class Nested
+}
+
+class Test : Z {
+    override fun funWithDefaultArgs(s: () -> Unit): () -> Unit {
+        return s
+    }
+
+    fun funWithDefaultArgsInClass(s: () -> Unit = {}): () -> Unit {
+        return s
+    }
+}
+
+fun box(): String {
+
+    val privateFun = Test().callPrivateFun()
+    var enclosing = privateFun.javaClass.enclosingMethod!!
+    if (enclosing.name != "privateFun") return "fail 1: ${enclosing.name}"
+    if (enclosing.getDeclaringClass().simpleName != "DefaultImpls") return "fail 2: ${enclosing.getDeclaringClass().simpleName}"
+
+    val publicFun = Test().publicFun()
+    enclosing = publicFun.javaClass.enclosingMethod!!
+    if (enclosing.name != "publicFun") return "fail 3: ${enclosing.name}"
+    if (enclosing.getDeclaringClass().simpleName != "DefaultImpls") return "fail 4: ${enclosing.getDeclaringClass().simpleName}"
+
+    val property = Test().property
+    enclosing = property.javaClass.enclosingMethod!!
+    if (enclosing.name != "getProperty") return "fail 4: ${enclosing.name}"
+    if (enclosing.getDeclaringClass().simpleName != "DefaultImpls") return "fail 5: ${enclosing.getDeclaringClass().simpleName}"
+
+    val defaultArgs = Test().funWithDefaultArgs()
+    enclosing = defaultArgs.javaClass.enclosingMethod!!
+    if (enclosing.name != "funWithDefaultArgs\$default") return "fail 6: ${enclosing.name}"
+    if (enclosing.parameterTypes.size != 4) return "fail 7: not default method ${enclosing.name}"
+    if (enclosing.getDeclaringClass().simpleName != "DefaultImpls") return "fail 8: ${enclosing.getDeclaringClass().simpleName}"
+
+    val defaultArgsInClass = Test().funWithDefaultArgsInClass()
+    enclosing = defaultArgsInClass.javaClass.enclosingMethod!!
+    if (enclosing.name != "funWithDefaultArgsInClass\$default") return "fail 6: ${enclosing.name}"
+    if (enclosing.parameterTypes.size != 4) return "fail 7: not default method ${enclosing.name}"
+    if (enclosing.getDeclaringClass().simpleName != "Test") return "fail 8: ${enclosing.getDeclaringClass().simpleName}"
+
+    val nested = Z.Nested::class.java
+    val enclosingClass = nested.enclosingClass!!
+    if (enclosingClass.name != "Z") return "fail 9: ${enclosingClass.name}"
+
+    return "OK"
+}

compiler/testData/codegen/java8/box/jvm8/kt11969.kt

@@ -0,0 +1,54 @@
+// JVM_TARGET: 1.8
+// WITH_RUNTIME
+// IGNORE_BACKEND: JS
+
+interface Z {
+    private fun privateFun() = { "OK" }
+
+    fun callPrivateFun() = privateFun()
+
+    fun publicFun() = { "OK" }
+
+    fun funWithDefaultArgs(s: () -> Unit = {}): () -> Unit
+
+    val property: () -> Unit
+        get() = {}
+
+    class Nested
+}
+
+class Test : Z {
+    override fun funWithDefaultArgs(s: () -> Unit): () -> Unit {
+        return s
+    }
+}
+
+fun box(): String {
+
+    val privateFun = Test().callPrivateFun()
+    var enclosing = privateFun.javaClass.enclosingMethod!!
+    if (enclosing.name != "privateFun") return "fail 1: ${enclosing.name}"
+    if (enclosing.getDeclaringClass().simpleName != "Z") return "fail 2: ${enclosing.getDeclaringClass().simpleName}"
+
+    val publicFun = Test().publicFun()
+    enclosing = publicFun.javaClass.enclosingMethod!!
+    if (enclosing.name != "publicFun") return "fail 3: ${enclosing.name}"
+    if (enclosing.getDeclaringClass().simpleName != "Z") return "fail 4: ${enclosing.getDeclaringClass().simpleName}"
+
+    val property = Test().property
+    enclosing = property.javaClass.enclosingMethod!!
+    if (enclosing.name != "getProperty") return "fail 4: ${enclosing.name}"
+    if (enclosing.getDeclaringClass().simpleName != "Z") return "fail 5: ${enclosing.getDeclaringClass().simpleName}"
+
+    val defaultArgs = Test().funWithDefaultArgs()
+    enclosing = defaultArgs.javaClass.enclosingMethod!!
+    if (enclosing.name != "funWithDefaultArgs\$default") return "fail 6: ${enclosing.name}"
+    if (enclosing.parameterTypes.size != 4) return "fail 7: not default method ${enclosing.name}"
+    if (enclosing.getDeclaringClass().simpleName != "Z") return "fail 8: ${enclosing.getDeclaringClass().simpleName}"
+
+    val nested = Z.Nested::class.java
+    val enclosingClass = nested.enclosingClass!!
+    if (enclosingClass.name != "Z") return "fail 9: ${enclosingClass.name}"
+
+    return "OK"
+}

compiler/testData/codegen/light-analysis/reflection/enclosing/kt11969.txt

@@ -0,0 +1,36 @@
+public final class Kt11969Kt {
+    public final static @org.jetbrains.annotations.NotNull method box(): java.lang.String
+}
+
+public final class Test {
+    public method <init>(): void
+    public @org.jetbrains.annotations.NotNull method callPrivateFun(): kotlin.jvm.functions.Function0
+    public @org.jetbrains.annotations.NotNull method funWithDefaultArgs(@org.jetbrains.annotations.NotNull p0: kotlin.jvm.functions.Function0): kotlin.jvm.functions.Function0
+    public synthetic static method funWithDefaultArgsInClass$default(p0: Test, p1: kotlin.jvm.functions.Function0, p2: int, p3: java.lang.Object): kotlin.jvm.functions.Function0
+    public final @org.jetbrains.annotations.NotNull method funWithDefaultArgsInClass(@org.jetbrains.annotations.NotNull p0: kotlin.jvm.functions.Function0): kotlin.jvm.functions.Function0
+    public @org.jetbrains.annotations.NotNull method getProperty(): kotlin.jvm.functions.Function0
+    public @org.jetbrains.annotations.NotNull method publicFun(): kotlin.jvm.functions.Function0
+}
+
+public interface Z {
+    inner class Z/DefaultImpls
+    inner class Z/Nested
+    public abstract @org.jetbrains.annotations.NotNull method callPrivateFun(): kotlin.jvm.functions.Function0
+    public abstract @org.jetbrains.annotations.NotNull method funWithDefaultArgs(@org.jetbrains.annotations.NotNull p0: kotlin.jvm.functions.Function0): kotlin.jvm.functions.Function0
+    public abstract @org.jetbrains.annotations.NotNull method getProperty(): kotlin.jvm.functions.Function0
+    public abstract @org.jetbrains.annotations.NotNull method publicFun(): kotlin.jvm.functions.Function0
+}
+
+public final class Z/DefaultImpls {
+    inner class Z/DefaultImpls
+    public static @org.jetbrains.annotations.NotNull method callPrivateFun(p0: Z): kotlin.jvm.functions.Function0
+    public synthetic static method funWithDefaultArgs$default(p0: Z, p1: kotlin.jvm.functions.Function0, p2: int, p3: java.lang.Object): kotlin.jvm.functions.Function0
+    public static @org.jetbrains.annotations.NotNull method getProperty(p0: Z): kotlin.jvm.functions.Function0
+    private static method privateFun(p0: Z): kotlin.jvm.functions.Function0
+    public static @org.jetbrains.annotations.NotNull method publicFun(p0: Z): kotlin.jvm.functions.Function0
+}
+
+public final static class Z/Nested {
+    inner class Z/Nested
+    public method <init>(): void
+}

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

@@ -13234,6 +13234,12 @@ public class IrBlackBoxCodegenTestGenerated extends AbstractIrBlackBoxCodegenTes
                 doTest(fileName);
             }
 
+            @TestMetadata("kt11969.kt")
+            public void testKt11969() throws Exception {
+                String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/reflection/enclosing/kt11969.kt");
+                doTest(fileName);
+            }
+
             @TestMetadata("kt6368.kt")
             public void testKt6368() throws Exception {
                 String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/reflection/enclosing/kt6368.kt");

compiler/tests-java8/tests/org/jetbrains/kotlin/codegen/BlackBoxWithJava8CodegenTestGenerated.java

@@ -203,6 +203,12 @@ public class BlackBoxWithJava8CodegenTestGenerated extends AbstractBlackBoxCodeg
             doTest(fileName);
         }
 
+        @TestMetadata("kt11969.kt")
+        public void testKt11969() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/java8/box/jvm8/kt11969.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("kt14243.kt")
         public void testKt14243() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/java8/box/jvm8/kt14243.kt");

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

@@ -13234,6 +13234,12 @@ public class BlackBoxCodegenTestGenerated extends AbstractBlackBoxCodegenTest {
                 doTest(fileName);
             }
 
+            @TestMetadata("kt11969.kt")
+            public void testKt11969() throws Exception {
+                String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/reflection/enclosing/kt11969.kt");
+                doTest(fileName);
+            }
+
             @TestMetadata("kt6368.kt")
             public void testKt6368() throws Exception {
                 String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/reflection/enclosing/kt6368.kt");

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

@@ -13234,6 +13234,12 @@ public class LightAnalysisModeCodegenTestGenerated extends AbstractLightAnalysis
                 doTest(fileName);
             }
 
+            @TestMetadata("kt11969.kt")
+            public void testKt11969() throws Exception {
+                String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/reflection/enclosing/kt11969.kt");
+                doTest(fileName);
+            }
+
             @TestMetadata("kt6368.kt")
             public void testKt6368() throws Exception {
                 String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/reflection/enclosing/kt6368.kt");

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

@@ -16139,6 +16139,18 @@ public class JsCodegenBoxTestGenerated extends AbstractJsCodegenBoxTest {
                 throw new AssertionError("Looks like this test can be unmuted. Remove IGNORE_BACKEND directive for that.");
             }
 
+            @TestMetadata("kt11969.kt")
+            public void testKt11969() throws Exception {
+                String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/reflection/enclosing/kt11969.kt");
+                try {
+                    doTest(fileName);
+                }
+                catch (Throwable ignore) {
+                    return;
+                }
+                throw new AssertionError("Looks like this test can be unmuted. Remove IGNORE_BACKEND directive for that.");
+            }
+
             @TestMetadata("kt6368.kt")
             public void testKt6368() throws Exception {
                 String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/reflection/enclosing/kt6368.kt");