[interop] do not print inline C++ namespaces when printing module interface

include/swift/AST/PrintOptions.h

@@ -276,6 +276,10 @@ struct PrintOptions {
   /// Whether to skip printing 'import' declarations.
   bool SkipImports = false;
 
+  /// Whether to skip over the C++ inline namespace when printing its members or
+  /// when printing it out as a qualifier.
+  bool SkipInlineCXXNamespace = false;
+
   /// Whether to skip printing overrides and witnesses for
   /// protocol requirements.
   bool SkipOverrides = false;

lib/AST/ASTPrinter.cpp

@@ -913,10 +913,12 @@ private:
   void printPatternType(const Pattern *P);
   void printAccessors(const AbstractStorageDecl *ASD);
   void printSelfAccessKindModifiersIfNeeded(const FuncDecl *FD);
-  void printMembersOfDecl(Decl * NTD, bool needComma = false,
+  void printMembersOfDecl(Decl *NTD, bool needComma = false,
-                          bool openBracket = true, bool closeBracket = true);
+                          bool openBracket = true, bool closeBracket = true,
+                          bool doIndent = true);
   void printMembers(ArrayRef<Decl *> members, bool needComma = false,
-                    bool openBracket = true, bool closeBracket = true);
+                    bool openBracket = true, bool closeBracket = true,
+                    bool doIndent = true);
   void printGenericDeclGenericParams(GenericContext *decl);
   void printDeclGenericRequirements(GenericContext *decl);
   void printPrimaryAssociatedTypes(ProtocolDecl *decl);
@@ -2378,9 +2380,8 @@ static void addNamespaceMembers(Decl *decl,
   }
 }
 
-void PrintAST::printMembersOfDecl(Decl *D, bool needComma,
+void PrintAST::printMembersOfDecl(Decl *D, bool needComma, bool openBracket,
-                                  bool openBracket,
+                                  bool closeBracket, bool doIndent) {
-                                  bool closeBracket) {
   llvm::SmallVector<Decl *, 16> Members;
   auto AddMembers = [&](IterableDeclContext *idc) {
     if (Options.PrintCurrentMembersOnly) {
@@ -2413,18 +2414,19 @@ void PrintAST::printMembersOfDecl(Decl *D, bool needComma,
     if (isa_and_nonnull<clang::NamespaceDecl>(D->getClangDecl()))
       addNamespaceMembers(D, Members);
   }
-  printMembers(Members, needComma, openBracket, closeBracket);
+  printMembers(Members, needComma, openBracket, closeBracket, doIndent);
 }
 
 void PrintAST::printMembers(ArrayRef<Decl *> members, bool needComma,
-                            bool openBracket, bool closeBracket) {
+                            bool openBracket, bool closeBracket,
+                            bool doIndent) {
   if (openBracket) {
     Printer << " {";
     if (!Options.PrintEmptyMembersOnSameLine || !members.empty())
       Printer.printNewline();
   }
   {
-    IndentRAII indentMore(*this);
+    IndentRAII indentMore(*this, /*DoIndent=*/doIndent);
     for (auto i = members.begin(), iEnd = members.end(); i != iEnd; ++i) {
       auto member = *i;
 
@@ -3713,6 +3715,13 @@ void PrintAST::visitEnumDecl(EnumDecl *decl) {
     if (!Printer.shouldPrintRedeclaredClangDecl(
             namespaceDecl->getOriginalNamespace()))
       return;
+
+    if (Options.SkipInlineCXXNamespace && namespaceDecl->isInline()) {
+      // Print members directly if this is an inline namespace.
+      printMembersOfDecl(decl, false, /*openBracket=*/false,
+                         /*closeBracket=*/false, /*doIndent=*/false);
+      return;
+    }
   }
   printDocumentationComment(decl);
   printAttributes(decl);
@@ -6003,6 +6012,20 @@ public:
            return;
        }
     }
+    if (Options.SkipInlineCXXNamespace) {
+      // Don't print the parent type if it's a reference to an inline C++
+      // namespace.
+      if (auto *enumTy = T->getAs<EnumType>()) {
+        if (const auto *namespaceDecl = dyn_cast_or_null<clang::NamespaceDecl>(
+                enumTy->getDecl()->getClangDecl())) {
+          if (namespaceDecl->isInline()) {
+            if (auto parent = enumTy->getParent())
+              visitParentType(parent);
+            return;
+          }
+        }
+      }
+    }
     PrintOptions innerOptions = Options;
     innerOptions.SynthesizeSugarOnTypes = false;
 

lib/IDE/ModuleInterfacePrinting.cpp

@@ -1149,6 +1149,7 @@ void swift::ide::printSymbolicSwiftClangModuleInterface(
       PrintOptions::printModuleInterface(/*printFullConvention=*/false);
   popts.PrintDocumentationComments = false;
   popts.PrintRegularClangComments = false;
+  popts.SkipInlineCXXNamespace = true;
 
   auto &SwiftContext = M->getTopLevelModule()->getASTContext();
   auto &Importer =

test/Interop/Cxx/symbolic-imports/indexing-emit-symbolic-module-interface.swift

@@ -81,6 +81,15 @@ namespace ns {
 
         InnerTemplate<int> returnsTemplateMethod();
     };
+
+    inline namespace __1 {
+        struct StructInInlineNamespace {
+        };
+
+        using TypealiasInInlineNamespace = TemplateRecord<StructInInlineNamespace>;
+    }
+
+    using TypealiasOfInlineNamespace = __1::StructInInlineNamespace;
 }
 
 using MyType = ns::TemplateRecord<int>;
@@ -128,6 +137,15 @@ import CxxModule
 // CHECK-EMPTY:
 // CHECK-NEXT:    mutating func returnsTemplateMethod()
 // CHECK-NEXT:  }
+// CHECK:       public struct StructInInlineNamespace {
+// CHECK-EMPTY:
+// CHECK-NEXT:    public init()
+// CHECK-NEXT:  }
+// CHECK-EMPTY:
+// CHECK-NEXT:  public typealias TypealiasInInlineNamespace = ns.TemplateRecord
+// CHECK-EMPTY:
+// CHECK-EMPTY:
+// CHECK-NEXT:  public typealias TypealiasOfInlineNamespace = ns.StructInInlineNamespace
 // CHECK-EMPTY:
 // CHECK-NEXT:  static func freeFunction(_ x: Int32, _ y: Int32) -> Int32
 // CHECK-NEXT: }

tools/SourceKit/lib/SwiftLang/SwiftEditorInterfaceGen.cpp

@@ -291,9 +291,12 @@ static bool getModuleInterfaceInfo(ASTContext &Ctx,
   PrintOptions Options = PrintOptions::printModuleInterface(
       Ctx.TypeCheckerOpts.PrintFullConvention);
   if (Mod->findUnderlyingClangModule()) {
-    // Show unavailable C++ APIs.
+    if (Ctx.LangOpts.EnableCXXInterop) {
-    if (Ctx.LangOpts.EnableCXXInterop)
+      // Show unavailable C++ APIs.
       Options.SkipUnavailable = false;
+      // Skip over inline namespaces.
+      Options.SkipInlineCXXNamespace = true;
+    }
   }
   ModuleTraversalOptions TraversalOptions = None; // Don't print submodules.
   SmallString<128> Text;