Light classes: allow light classes for inner/nested classes to be build separately

Avoid analyzing/generating bytecode for outers

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

@@ -77,9 +77,13 @@ public abstract class ClassBodyCodegen extends MemberCodegen<KtPureClassOrObject
             }
         }
 
-        generatePrimaryConstructorProperties();
-        generateConstructors();
-        generateDefaultImplsIfNeeded();
+        boolean generateNonClassMembers = shouldGenerateNonClassMembers();
+
+        if (generateNonClassMembers) {
+            generatePrimaryConstructorProperties();
+            generateConstructors();
+            generateDefaultImplsIfNeeded();
+        }
 
         // Generate _declared_ companions
         for (KtObjectDeclaration companion : companions) {
@@ -92,23 +96,30 @@ public abstract class ClassBodyCodegen extends MemberCodegen<KtPureClassOrObject
             genSyntheticClassOrObject((SyntheticClassOrObjectDescriptor) companionObjectDescriptor);
         }
 
-        if (!DescriptorUtils.isInterface(descriptor)) {
-            for (DeclarationDescriptor memberDescriptor : DescriptorUtils.getAllDescriptors(descriptor.getDefaultType().getMemberScope())) {
-                if (memberDescriptor instanceof CallableMemberDescriptor) {
-                    CallableMemberDescriptor member = (CallableMemberDescriptor) memberDescriptor;
-                    if (!member.getKind().isReal() && ImplKt.findInterfaceImplementation(member) == null) {
-                        if (member instanceof FunctionDescriptor) {
-                            functionCodegen.generateBridges((FunctionDescriptor) member);
+        if (generateNonClassMembers) {
+            generateBridges();
+        }
+    }
+
+    private void generateBridges() {
+        if (DescriptorUtils.isInterface(descriptor)) {
+            return;
+        }
+        for (DeclarationDescriptor memberDescriptor : DescriptorUtils.getAllDescriptors(descriptor.getDefaultType().getMemberScope())) {
+            if (memberDescriptor instanceof CallableMemberDescriptor) {
+                CallableMemberDescriptor member = (CallableMemberDescriptor) memberDescriptor;
+                if (!member.getKind().isReal() && ImplKt.findInterfaceImplementation(member) == null) {
+                    if (member instanceof FunctionDescriptor) {
+                        functionCodegen.generateBridges((FunctionDescriptor) member);
+                    }
+                    else if (member instanceof PropertyDescriptor) {
+                        PropertyGetterDescriptor getter = ((PropertyDescriptor) member).getGetter();
+                        if (getter != null) {
+                            functionCodegen.generateBridges(getter);
                         }
-                        else if (member instanceof PropertyDescriptor) {
-                            PropertyGetterDescriptor getter = ((PropertyDescriptor) member).getGetter();
-                            if (getter != null) {
-                                functionCodegen.generateBridges(getter);
-                            }
-                            PropertySetterDescriptor setter = ((PropertyDescriptor) member).getSetter();
-                            if (setter != null) {
-                                functionCodegen.generateBridges(setter);
-                            }
+                        PropertySetterDescriptor setter = ((PropertyDescriptor) member).getSetter();
+                        if (setter != null) {
+                            functionCodegen.generateBridges(setter);
                         }
                     }
                 }
@@ -116,6 +127,11 @@ public abstract class ClassBodyCodegen extends MemberCodegen<KtPureClassOrObject
         }
     }
 
+    private boolean shouldGenerateNonClassMembers() {
+        return !(myClass instanceof KtClassOrObject) ||
+               state.getGenerateDeclaredClassFilter().shouldGenerateClassMembers((KtClassOrObject) myClass);
+    }
+
     protected void generateConstructors() {
 
     }
@@ -130,7 +146,9 @@ public abstract class ClassBodyCodegen extends MemberCodegen<KtPureClassOrObject
 
     protected void generateDeclaration(KtDeclaration declaration) {
         if (declaration instanceof KtProperty || declaration instanceof KtNamedFunction || declaration instanceof KtTypeAlias) {
-            genSimpleMember(declaration);
+            if (shouldGenerateNonClassMembers()) {
+                genSimpleMember(declaration);
+            }
         }
         else if (declaration instanceof KtClassOrObject) {
             if (declaration instanceof KtEnumEntry && !enumEntryNeedSubclass(bindingContext, (KtEnumEntry) declaration)) {

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

@@ -127,7 +127,10 @@ public abstract class MemberCodegen<T extends KtPureElement/* TODO: & KtDeclarat
 
         generateBody();
 
-        generateSyntheticParts();
+        if (!(element instanceof KtClassOrObject) ||
+            state.getGenerateDeclaredClassFilter().shouldGenerateClassMembers((KtClassOrObject) element)) {
+            generateSyntheticParts();
+        }
 
         if (state.getClassBuilderMode().generateMetadata) {
             generateKotlinMetadataAnnotation();

compiler/backend/src/org/jetbrains/kotlin/codegen/state/GenerationState.kt

@@ -71,6 +71,7 @@ class GenerationState @JvmOverloads constructor(
         abstract fun shouldGenerateClass(processingClassOrObject: KtClassOrObject): Boolean
         abstract fun shouldGeneratePackagePart(jetFile: KtFile): Boolean
         abstract fun shouldGenerateScript(script: KtScript): Boolean
+        open fun shouldGenerateClassMembers(processingClassOrObject: KtClassOrObject) = shouldGenerateClass(processingClassOrObject)
 
         companion object {
             @JvmField val GENERATE_ALL: GenerateClassFilter = object : GenerateClassFilter() {