[cxx-interop] Import custom NS_OPTIONS correctly

lib/ClangImporter/ImportType.cpp

@@ -2646,44 +2646,31 @@ ArgumentAttrs ClangImporter::Implementation::inferDefaultArgument(
     }
   } else if (const clang::TypedefType *typedefType =
                  type->getAs<clang::TypedefType>()) {
-    // Get the AvailabilityAttr that would be set from CF/NS_OPTIONS
-    if (importer::isUnavailableInSwift(typedefType->getDecl(), nullptr, true)) {
-      // If we've taken this branch it means we have an enum type, and it is
-      // likely an integer or NSInteger that is being used by NS/CF_OPTIONS to
-      // behave like a C enum in the presence of C++.
-      auto enumName = typedefType->getDecl()->getName();
-      ArgumentAttrs argumentAttrs(DefaultArgumentKind::None, true, enumName);
-      auto camelCaseWords = camel_case::getWords(enumName);
-      for (auto it = camelCaseWords.rbegin(); it != camelCaseWords.rend();
-           ++it) {
-        auto word = *it;
-        auto next = std::next(it);
-        if (camel_case::sameWordIgnoreFirstCase(word, "options")) {
-          argumentAttrs.argumentKind = DefaultArgumentKind::EmptyArray;
-          return argumentAttrs;
+    clang::TypedefNameDecl *typedefDecl = typedefType->getDecl();
+    // Find the next decl in the same context. If this typedef is a part of an
+    // NS/CF_OPTIONS declaration, the next decl will be an enum.
+    auto declsInContext = typedefDecl->getDeclContext()->decls();
+    auto declIter = llvm::find(declsInContext, typedefDecl);
+    if (declIter != declsInContext.end())
+      declIter++;
+    if (declIter != declsInContext.end()) {
+      if (auto enumDecl = dyn_cast<clang::EnumDecl>(*declIter)) {
+        if (auto cfOptionsTy =
+                nameImporter.getContext()
+                    .getClangModuleLoader()
+                    ->getTypeDefForCXXCFOptionsDefinition(enumDecl)) {
+          if (cfOptionsTy->getDecl() == typedefDecl) {
+            auto enumName = typedefDecl->getName();
+            ArgumentAttrs argumentAttrs(DefaultArgumentKind::None, true,
+                                        enumName);
+            for (auto word : llvm::reverse(camel_case::getWords(enumName))) {
+              if (camel_case::sameWordIgnoreFirstCase(word, "options")) {
+                argumentAttrs.argumentKind = DefaultArgumentKind::EmptyArray;
+              }
+            }
+            return argumentAttrs;
+          }
         }
-        if (camel_case::sameWordIgnoreFirstCase(word, "units"))
-          return argumentAttrs;
-        if (camel_case::sameWordIgnoreFirstCase(word, "domain"))
-          return argumentAttrs;
-        if (camel_case::sameWordIgnoreFirstCase(word, "action"))
-          return argumentAttrs;
-        if (camel_case::sameWordIgnoreFirstCase(word, "event"))
-          return argumentAttrs;
-        if (camel_case::sameWordIgnoreFirstCase(word, "events") &&
-            next != camelCaseWords.rend() &&
-            camel_case::sameWordIgnoreFirstCase(*next, "control"))
-          return argumentAttrs;
-        if (camel_case::sameWordIgnoreFirstCase(word, "state"))
-          return argumentAttrs;
-        if (camel_case::sameWordIgnoreFirstCase(word, "unit"))
-          return argumentAttrs;
-        if (camel_case::sameWordIgnoreFirstCase(word, "position") &&
-            next != camelCaseWords.rend() &&
-            camel_case::sameWordIgnoreFirstCase(*next, "scroll"))
-          return argumentAttrs;
-        if (camel_case::sameWordIgnoreFirstCase(word, "edge"))
-          return argumentAttrs;
       }
     }
   }

test/Interop/Cxx/enum/Inputs/c-enums-withOptions-omit.h

@@ -1,39 +1,57 @@
-// Enum usage that is bitwise-able and assignable in C++, aka how CF_OPTIONS
-// does things.
-typedef int __attribute__((availability(swift, unavailable))) NSEnumerationOptions;
-enum : NSEnumerationOptions { NSEnumerationConcurrent, NSEnumerationReverse };
+typedef unsigned NSUInteger;
+
+#define __CF_OPTIONS_ATTRIBUTES __attribute__((flag_enum,enum_extensibility(open)))
+#if (__cplusplus)
+#define CF_OPTIONS(_type, _name) __attribute__((availability(swift,unavailable))) _type _name; enum __CF_OPTIONS_ATTRIBUTES : _name
+#else
+#define CF_OPTIONS(_type, _name) enum __CF_OPTIONS_ATTRIBUTES _name : _type _name; enum _name : _type
+#endif
+
+typedef CF_OPTIONS(NSUInteger, NSEnumerationOptions) {
+  NSEnumerationConcurrent = (1UL << 0),
+  NSEnumerationReverse = (1UL << 1),
+};
 
 @interface NSSet
 - (void)enumerateObjectsWithOptions:(NSEnumerationOptions)opts ;
 @end
 
-typedef int __attribute__((availability(swift, unavailable))) NSOrderedCollectionDifferenceCalculationOptions;
-enum : NSOrderedCollectionDifferenceCalculationOptions {
+typedef CF_OPTIONS(NSUInteger, NSOrderedCollectionDifferenceCalculationOptions) {
   NSOrderedCollectionDifferenceCalculationOptions1,
   NSOrderedCollectionDifferenceCalculationOptions2
 };
 
-typedef int __attribute__((availability(swift, unavailable))) NSCalendarUnit;
-enum : NSCalendarUnit { NSCalendarUnit1, NSCalendarUnit2 };
+typedef CF_OPTIONS(NSUInteger, NSCalendarUnit) {
+  NSCalendarUnit1,
+  NSCalendarUnit2
+};
 
-typedef int __attribute__((availability(swift, unavailable))) NSSearchPathDomainMask;
-enum : NSSearchPathDomainMask { NSSearchPathDomainMask1, NSSearchPathDomainMask2 };
+typedef CF_OPTIONS(NSUInteger, NSSearchPathDomainMask) {
+  NSSearchPathDomainMask1,
+  NSSearchPathDomainMask2
+};
 
-typedef int __attribute__((availability(swift, unavailable))) NSControlCharacterAction;
-enum : NSControlCharacterAction { NSControlCharacterAction1, NSControlCharacterAction2 };
+typedef CF_OPTIONS(NSUInteger, NSControlCharacterAction) {
+  NSControlCharacterAction1,
+  NSControlCharacterAction2
+};
 
-typedef int __attribute__((availability(swift, unavailable))) UIControlState;
-enum : UIControlState { UIControlState1, UIControlState2 };
+typedef CF_OPTIONS(NSUInteger, UIControlState) {
+  UIControlState1,
+  UIControlState2
+};
 
-typedef int __attribute__((availability(swift, unavailable))) UITableViewCellStateMask;
-enum : UITableViewCellStateMask { UITableViewCellStateMask1, UITableViewCellStateMask2 };
+typedef CF_OPTIONS(NSUInteger, UITableViewCellStateMask) {
+  UITableViewCellStateMask1,
+  UITableViewCellStateMask2
+};
 
-typedef int __attribute__((availability(swift, unavailable))) UIControlEvents;
-enum : UIControlEvents { UIControlEvents1, UIControlEvents2 };
+typedef CF_OPTIONS(NSUInteger, UIControlEvents) {
+  UIControlEvents1,
+  UIControlEvents2
+};
 
-typedef int __attribute__((availability(swift, unavailable)))
-UITableViewScrollPosition;
-enum : UITableViewScrollPosition {
+typedef CF_OPTIONS(NSUInteger, UITableViewScrollPosition) {
   UITableViewScrollPosition1,
   UITableViewScrollPosition2
 };

test/Interop/Cxx/objc-correctness/Inputs/customNSOptions.h

@@ -0,0 +1,6 @@
+#include "CFOptions.h"
+
+typedef CF_OPTIONS(unsigned, MyControlFlags) {
+  MyControlFlagsNone = 0,
+  MyControlFlagsFirst
+};

test/Interop/Cxx/objc-correctness/Inputs/module.modulemap

@@ -9,6 +9,10 @@ module CxxClassWithNSStringInit {
   requires cplusplus
 }
 
+module CustomNSOptions {
+  header "customNSOptions.h"
+}
+
 module NSOptionsMangling {
   header "NSOptionsMangling.h"
 }

test/Interop/Cxx/objc-correctness/custom-nsoptions.swift

@@ -0,0 +1,7 @@
+// RUN: %target-typecheck-verify-swift -verify-ignore-unknown -I %S/Inputs -enable-objc-interop -enable-experimental-cxx-interop
+// REQUIRES: objc_interop
+
+import CustomNSOptions
+
+let flags1: MyControlFlags = []
+let flags2: MyControlFlags = [.first]