void generateDefaultIfNeeded(
      @NotNull MethodContext owner,
      @NotNull FunctionDescriptor functionDescriptor,
      @NotNull OwnerKind kind,
      @NotNull DefaultParameterValueLoader loadStrategy,
      @Nullable JetNamedFunction function) {
    DeclarationDescriptor contextClass = owner.getContextDescriptor().getContainingDeclaration();

    if (kind != OwnerKind.DEFAULT_IMPLS && isInterface(contextClass)) {
      return;
    }

    if (!isDefaultNeeded(functionDescriptor)) {
      return;
    }

    int flags =
        getVisibilityAccessFlag(functionDescriptor)
            | getDeprecatedAccessFlag(functionDescriptor)
            | ACC_SYNTHETIC;
    if (!(functionDescriptor instanceof ConstructorDescriptor)) {
      flags |= ACC_STATIC;
    }
    // $default methods are never private to be accessible from other class files (e.g. inner)
    // without the need of synthetic accessors
    flags &= ~ACC_PRIVATE;

    Method defaultMethod = typeMapper.mapDefaultMethod(functionDescriptor, kind);

    MethodVisitor mv =
        v.newMethod(
            Synthetic(function, functionDescriptor),
            flags,
            defaultMethod.getName(),
            defaultMethod.getDescriptor(),
            null,
            getThrownExceptions(functionDescriptor, typeMapper));

    // Only method annotations are copied to the $default method. Parameter annotations are not
    // copied until there are valid use cases;
    // enum constructors have two additional synthetic parameters which somewhat complicate this
    // task
    AnnotationCodegen.forMethod(mv, typeMapper)
        .genAnnotations(functionDescriptor, defaultMethod.getReturnType());

    if (state.getClassBuilderMode() == ClassBuilderMode.FULL) {
      if (this.owner instanceof DelegatingFacadeContext) {
        mv.visitCode();
        generateFacadeDelegateMethodBody(mv, defaultMethod, (DelegatingFacadeContext) this.owner);
        endVisit(mv, "default method delegation", getSourceFromDescriptor(functionDescriptor));
      } else {
        mv.visitCode();
        generateDefaultImplBody(
            owner, functionDescriptor, mv, loadStrategy, function, memberCodegen);
        endVisit(mv, "default method", getSourceFromDescriptor(functionDescriptor));
      }
    }
  }
  private void generateBridge(
      @Nullable PsiElement origin,
      @NotNull FunctionDescriptor descriptor,
      @NotNull Method bridge,
      @NotNull Method delegateTo,
      boolean isSpecialBridge,
      boolean superCallNeeded) {
    int flags =
        ACC_PUBLIC
            | ACC_BRIDGE
            | (!isSpecialBridge ? ACC_SYNTHETIC : 0)
            | (isSpecialBridge ? ACC_FINAL : 0); // TODO.

    MethodVisitor mv =
        v.newMethod(
            DiagnosticsPackage.Bridge(descriptor, origin),
            flags,
            bridge.getName(),
            bridge.getDescriptor(),
            null,
            null);
    if (state.getClassBuilderMode() != ClassBuilderMode.FULL) return;

    mv.visitCode();

    Type[] argTypes = bridge.getArgumentTypes();
    Type[] originalArgTypes = delegateTo.getArgumentTypes();

    InstructionAdapter iv = new InstructionAdapter(mv);
    ImplementationBodyCodegen.markLineNumberForSyntheticFunction(owner.getThisDescriptor(), iv);

    iv.load(0, OBJECT_TYPE);
    for (int i = 0, reg = 1; i < argTypes.length; i++) {
      StackValue.local(reg, argTypes[i]).put(originalArgTypes[i], iv);
      //noinspection AssignmentToForLoopParameter
      reg += argTypes[i].getSize();
    }

    if (superCallNeeded) {
      ClassDescriptor parentClass =
          getSuperClassDescriptor((ClassDescriptor) descriptor.getContainingDeclaration());
      assert parentClass != null;
      String parentInternalName = typeMapper.mapClass(parentClass).getInternalName();
      iv.invokespecial(parentInternalName, delegateTo.getName(), delegateTo.getDescriptor());
    } else {
      iv.invokevirtual(v.getThisName(), delegateTo.getName(), delegateTo.getDescriptor());
    }

    StackValue.coerce(delegateTo.getReturnType(), bridge.getReturnType(), iv);
    iv.areturn(bridge.getReturnType());

    endVisit(mv, "bridge method", origin);
  }
  public void generateBridges(@NotNull FunctionDescriptor descriptor) {
    if (descriptor instanceof ConstructorDescriptor) return;
    if (owner.getContextKind() == OwnerKind.DEFAULT_IMPLS) return;
    if (isInterface(descriptor.getContainingDeclaration())) return;

    // equals(Any?), hashCode(), toString() never need bridges
    if (isMethodOfAny(descriptor)) return;

    // If the function doesn't have a physical declaration among super-functions, it's a SAM adapter
    // or alike and doesn't need bridges
    if (CallResolverUtilPackage.isOrOverridesSynthesized(descriptor)) return;

    boolean isSpecial = BuiltinsPropertiesUtilKt.overridesBuiltinSpecialDeclaration(descriptor);

    Set<Bridge<Method>> bridgesToGenerate;
    if (!isSpecial) {
      bridgesToGenerate =
          BridgesPackage.generateBridgesForFunctionDescriptor(
              descriptor,
              new Function1<FunctionDescriptor, Method>() {
                @Override
                public Method invoke(FunctionDescriptor descriptor) {
                  return typeMapper.mapSignature(descriptor).getAsmMethod();
                }
              });
      if (!bridgesToGenerate.isEmpty()) {
        PsiElement origin =
            descriptor.getKind() == DECLARATION ? getSourceFromDescriptor(descriptor) : null;
        for (Bridge<Method> bridge : bridgesToGenerate) {
          generateBridge(origin, descriptor, bridge.getFrom(), bridge.getTo(), false, false);
        }
      }
    } else {
      Set<BridgeForBuiltinSpecial<Method>> specials =
          BuiltinSpecialBridgesUtil.generateBridgesForBuiltinSpecial(
              descriptor,
              new Function1<FunctionDescriptor, Method>() {
                @Override
                public Method invoke(FunctionDescriptor descriptor) {
                  return typeMapper.mapSignature(descriptor).getAsmMethod();
                }
              });

      if (!specials.isEmpty()) {
        PsiElement origin =
            descriptor.getKind() == DECLARATION ? getSourceFromDescriptor(descriptor) : null;
        for (BridgeForBuiltinSpecial<Method> bridge : specials) {
          generateBridge(
              origin,
              descriptor,
              bridge.getFrom(),
              bridge.getTo(),
              bridge.isSpecial(),
              bridge.isDelegateToSuper());
        }
      }

      if (!descriptor.getKind().isReal()
          && isAbstractMethod(descriptor, OwnerKind.IMPLEMENTATION)) {
        CallableDescriptor overridden =
            BuiltinsPropertiesUtilKt.getBuiltinSpecialOverridden(descriptor);
        assert overridden != null;

        Method method = typeMapper.mapSignature(descriptor).getAsmMethod();
        int flags = ACC_ABSTRACT | getVisibilityAccessFlag(descriptor);
        v.newMethod(
            OtherOrigin(overridden), flags, method.getName(), method.getDescriptor(), null, null);
      }
    }
  }
  public void generateMethod(
      @NotNull JvmDeclarationOrigin origin,
      @NotNull FunctionDescriptor functionDescriptor,
      @NotNull MethodContext methodContext,
      @NotNull FunctionGenerationStrategy strategy) {
    OwnerKind contextKind = methodContext.getContextKind();
    if (isInterface(functionDescriptor.getContainingDeclaration())
        && functionDescriptor.getVisibility() == Visibilities.PRIVATE
        && contextKind != OwnerKind.DEFAULT_IMPLS) {
      return;
    }

    JvmMethodSignature jvmSignature = typeMapper.mapSignature(functionDescriptor, contextKind);
    Method asmMethod = jvmSignature.getAsmMethod();

    int flags = getMethodAsmFlags(functionDescriptor, contextKind);
    boolean isNative = NativeDeclarationsPackage.hasNativeAnnotation(functionDescriptor);

    if (isNative && owner instanceof DelegatingFacadeContext) {
      // Native methods are only defined in facades and do not need package part implementations
      return;
    }
    MethodVisitor mv =
        v.newMethod(
            origin,
            flags,
            asmMethod.getName(),
            asmMethod.getDescriptor(),
            jvmSignature.getGenericsSignature(),
            getThrownExceptions(functionDescriptor, typeMapper));

    String implClassName = CodegenContextUtil.getImplementationClassShortName(owner);
    if (implClassName != null) {
      v.getSerializationBindings()
          .put(IMPL_CLASS_NAME_FOR_CALLABLE, functionDescriptor, implClassName);
    }
    if (CodegenContextUtil.isImplClassOwner(owner)) {
      v.getSerializationBindings().put(METHOD_FOR_FUNCTION, functionDescriptor, asmMethod);
    }

    generateMethodAnnotations(functionDescriptor, asmMethod, mv);

    generateParameterAnnotations(
        functionDescriptor, mv, typeMapper.mapSignature(functionDescriptor));

    generateBridges(functionDescriptor);

    boolean staticInCompanionObject =
        AnnotationsPackage.isPlatformStaticInCompanionObject(functionDescriptor);
    if (staticInCompanionObject) {
      ImplementationBodyCodegen parentBodyCodegen =
          (ImplementationBodyCodegen) memberCodegen.getParentCodegen();
      parentBodyCodegen.addAdditionalTask(
          new PlatformStaticGenerator(functionDescriptor, origin, state));
    }

    if (state.getClassBuilderMode() == ClassBuilderMode.LIGHT_CLASSES
        || isAbstractMethod(functionDescriptor, contextKind)) {
      generateLocalVariableTable(
          mv,
          jvmSignature,
          functionDescriptor,
          getThisTypeForFunction(functionDescriptor, methodContext, typeMapper),
          new Label(),
          new Label(),
          contextKind);

      mv.visitEnd();
      return;
    }

    if (!isNative) {
      generateMethodBody(
          mv, functionDescriptor, methodContext, jvmSignature, strategy, memberCodegen);
    } else if (staticInCompanionObject) {
      // native platformStatic foo() in companion object should delegate to the static native
      // function moved to the outer class
      mv.visitCode();
      FunctionDescriptor staticFunctionDescriptor =
          PlatformStaticGenerator.createStaticFunctionDescriptor(functionDescriptor);
      JvmMethodSignature jvmMethodSignature =
          typeMapper.mapSignature(
              memberCodegen.getContext().accessibleDescriptor(staticFunctionDescriptor, null));
      Type owningType =
          typeMapper.mapClass(
              (ClassifierDescriptor) staticFunctionDescriptor.getContainingDeclaration());
      generateDelegateToMethodBody(
          false, mv, jvmMethodSignature.getAsmMethod(), owningType.getInternalName());
    }

    endVisit(mv, null, origin.getElement());

    methodContext.recordSyntheticAccessorIfNeeded(functionDescriptor, bindingContext);
  }