Support inner/nested classes in JVM back-end

#KT-1174 In Progress

compiler/backend/src/org/jetbrains/jet/codegen/ImplementationBodyCodegen.java

@@ -187,7 +187,7 @@ public class ImplementationBodyCodegen extends ClassBodyCodegen {
 
     private void writeInnerClasses() {
         for (ClassDescriptor innerClass : getInnerClassesAndObjects(descriptor)) {
-            writeInnerClass(innerClass, false /* TODO */);
+            writeInnerClass(innerClass);
         }
 
         ClassDescriptor classObjectDescriptor = descriptor.getClassObjectDescriptor();
@@ -199,7 +199,7 @@ public class ImplementationBodyCodegen extends ClassBodyCodegen {
         }
     }
 
-    private void writeInnerClass(ClassDescriptor innerClass, boolean isStatic) {
+    private void writeInnerClass(ClassDescriptor innerClass) {
         // TODO: proper access
         int innerClassAccess = getVisibilityAccessFlag(innerClass);
         if (innerClass.getModality() == Modality.FINAL) {
@@ -216,7 +216,7 @@ public class ImplementationBodyCodegen extends ClassBodyCodegen {
             innerClassAccess |= ACC_ENUM;
         }
 
-        if (isStatic) {
+        if (!innerClass.isInner()) {
             innerClassAccess |= ACC_STATIC;
         }
 

compiler/backend/src/org/jetbrains/jet/codegen/binding/CodegenBinding.java

@@ -134,17 +134,25 @@ public class CodegenBinding {
     }
 
     public static boolean canHaveOuter(BindingContext bindingContext, @NotNull ClassDescriptor classDescriptor) {
-        final ClassKind kind = classDescriptor.getKind();
         if (isSingleton(bindingContext, classDescriptor)) {
             return false;
         }
 
-        if (kind == ClassKind.ENUM_CLASS) {
+        ClassDescriptor enclosing = enclosingClassDescriptor(bindingContext, classDescriptor);
+        if (enclosing == null) {
             return false;
         }
 
-        final ClassDescriptor enclosing = enclosingClassDescriptor(bindingContext, classDescriptor);
-        return enclosing != null && !isSingleton(bindingContext, enclosing);
+        ClassKind kind = classDescriptor.getKind();
+        if (kind == ClassKind.CLASS) {
+            return classDescriptor.isInner() || !(classDescriptor.getContainingDeclaration() instanceof ClassDescriptor);
+        }
+        else if (kind == ClassKind.OBJECT) {
+            return !isSingleton(bindingContext, enclosing);
+        }
+        else {
+            return false;
+        }
     }
 
     public static boolean isSingleton(BindingContext bindingContext, @NotNull ClassDescriptor classDescriptor) {

compiler/testData/writeFlags/innerClass/visibility/internal.kt

@@ -1,5 +1,5 @@
 class Foo {
-  class MyClass() {
+  inner class MyClass() {
   }
 }
 

compiler/testData/writeFlags/innerClass/visibility/private.kt

@@ -1,5 +1,5 @@
 class Foo {
-  private class MyClass() {
+  private inner class MyClass() {
   }
 }
 

compiler/testData/writeFlags/innerClass/visibility/public.kt

@@ -1,5 +1,5 @@
 class Foo {
-  public class MyClass() {
+  public inner class MyClass() {
   }
 }
 

compiler/testData/writeFlags/property/visibility/internal.kt

@@ -1,5 +1,5 @@
 class Foo {
-  class MyClass() {
+  inner class MyClass() {
   }
 }
 

compiler/testData/writeFlags/property/visibility/private.kt

@@ -1,5 +1,5 @@
 class Foo {
-  private class MyClass() {
+  private inner class MyClass() {
   }
 }
 

compiler/testData/writeFlags/property/visibility/public.kt

@@ -1,5 +1,5 @@
 class Foo {
-  public class MyClass() {
+  public inner class MyClass() {
   }
 }