Revert "[cxx-interop] Refactor: do not rely on Clang module importer being available"

This reverts commit 6a2f10a.

Author: hyp

include/swift/AST/ClangModuleLoader.h

@@ -306,6 +306,9 @@ class ClangModuleLoader : public ModuleLoader {
   virtual EffectiveClangContext getEffectiveClangContext(
       const NominalTypeDecl *nominal) = 0;
 
+  virtual const clang::TypedefType *
+  getTypeDefForCXXCFOptionsDefinition(const clang::Decl *candidateDecl) = 0;
+
   virtual SourceLoc importSourceLocation(clang::SourceLocation loc) = 0;
 };
 

include/swift/ClangImporter/ClangImporter.h

@@ -609,8 +609,8 @@ class ClangImporter final : public ClangModuleLoader {
   /// Enable the symbolic import experimental feature for the given callback.
   void withSymbolicFeatureEnabled(llvm::function_ref<void(void)> callback);
 
-  static const clang::TypedefType *getTypedefForCXXCFOptionsDefinition(
-      const clang::Decl *candidateDecl, const ASTContext &ctx);
+  const clang::TypedefType *getTypeDefForCXXCFOptionsDefinition(
+      const clang::Decl *candidateDecl) override;
 
   SourceLoc importSourceLocation(clang::SourceLocation loc) override;
 };

lib/AST/ASTMangler.cpp

@@ -2548,8 +2548,8 @@ ASTMangler::getTypeDefForCXXCFOptionsDefinition(const ValueDecl *decl) {
   if (!clangDecl)
     return nullptr;
 
-  auto &ctx = decl->getASTContext();
-  return ClangImporter::getTypedefForCXXCFOptionsDefinition(clangDecl, ctx);
+  const auto &clangModuleLoader = decl->getASTContext().getClangModuleLoader();
+  return clangModuleLoader->getTypeDefForCXXCFOptionsDefinition(clangDecl);
 }
 
 const clang::NamedDecl *

lib/ClangImporter/ClangImporter.cpp

@@ -7023,23 +7023,26 @@ void ClangImporter::withSymbolicFeatureEnabled(
       oldImportSymbolicCXXDecls.get());
 }
 
-const clang::TypedefType *ClangImporter::getTypedefForCXXCFOptionsDefinition(
-    const clang::Decl *candidateDecl, const ASTContext &ctx) {
-  if (!ctx.LangOpts.EnableCXXInterop)
+const clang::TypedefType *ClangImporter::getTypeDefForCXXCFOptionsDefinition(
+    const clang::Decl *candidateDecl) {
+
+  if (!Impl.SwiftContext.LangOpts.EnableCXXInterop)
     return nullptr;
 
   auto enumDecl = dyn_cast<clang::EnumDecl>(candidateDecl);
   if (!enumDecl)
     return nullptr;
+
   if (!enumDecl->getDeclName().isEmpty())
     return nullptr;
 
   const clang::ElaboratedType *elaboratedType =
-      enumDecl->getIntegerType()->getAs<clang::ElaboratedType>();
+      dyn_cast<clang::ElaboratedType>(enumDecl->getIntegerType().getTypePtr());
   if (auto typedefType =
           elaboratedType
               ? dyn_cast<clang::TypedefType>(elaboratedType->desugar())
-              : enumDecl->getIntegerType()->getAs<clang::TypedefType>()) {
+              : dyn_cast<clang::TypedefType>(
+                    enumDecl->getIntegerType().getTypePtr())) {
     auto enumExtensibilityAttr =
         elaboratedType
             ? enumDecl->getAttr<clang::EnumExtensibilityAttr>()
@@ -7052,13 +7055,8 @@ const clang::TypedefType *ClangImporter::getTypedefForCXXCFOptionsDefinition(
         enumExtensibilityAttr->getExtensibility() ==
             clang::EnumExtensibilityAttr::Open &&
         hasFlagEnumAttr) {
-      // Make sure the typedef is marked as unavailable in Swift.
-      auto typedefDecl = typedefType->getDecl();
-      for (auto *attr :
-           typedefDecl->specific_attrs<clang::AvailabilityAttr>()) {
-        if (attr->getPlatform()->getName() == "swift")
-          return typedefType;
-      }
+      return Impl.isUnavailableInSwift(typedefType->getDecl()) ? typedefType
+                                                               : nullptr;
     }
   }
 

lib/ClangImporter/ImportType.cpp

@@ -2656,8 +2656,9 @@ ArgumentAttrs ClangImporter::Implementation::inferDefaultArgument(
     if (declIter != declsInContext.end()) {
       if (auto enumDecl = dyn_cast<clang::EnumDecl>(*declIter)) {
         if (auto cfOptionsTy =
-                ClangImporter::getTypedefForCXXCFOptionsDefinition(
-                    enumDecl, nameImporter.getContext())) {
+                nameImporter.getContext()
+                    .getClangModuleLoader()
+                    ->getTypeDefForCXXCFOptionsDefinition(enumDecl)) {
           if (cfOptionsTy->getDecl() == typedefDecl) {
             auto enumName = typedefDecl->getName();
             ArgumentAttrs argumentAttrs(DefaultArgumentKind::None, true,

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

@@ -1,16 +1,7 @@
-// RUN: rm -rf %t
-// RUN: mkdir -p %t/pch
-
 // RUN: %target-typecheck-verify-swift -verify-ignore-unknown -I %S/Inputs -enable-objc-interop -enable-experimental-cxx-interop
-
-// RUN: %target-swift-frontend -emit-pch -enable-objc-interop -enable-experimental-cxx-interop -o %t/pch/customNSOptions.pch %S/Inputs/customNSOptions.h
-// RUN: %target-typecheck-verify-swift -D BRIDGING_HEADER -I %S/Inputs -import-objc-header %t/pch/customNSOptions.pch -enable-objc-interop -enable-experimental-cxx-interop %s
-
 // REQUIRES: objc_interop
 
-#if !BRIDGING_HEADER
 import CustomNSOptions
-#endif
 
 let flags1: MyControlFlags = []
 let flags2: MyControlFlags = [.first]