Record whether a module came from a private module map

Right now we only use this information in one place, immediately after
we calculate it, but it's still nice information to have. The Swift
project is going to use this to tidy up its "API notes" feature (see
past discussion on cfe-dev that never quite converged).

Reviewed by Bruno Cardoso Lopes.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@330452 91177308-0d34-0410-b5e6-96231b3b80d8

include/clang/Basic/Module.h

@@ -258,6 +258,10 @@ public:
   /// and headers from used modules.
   unsigned NoUndeclaredIncludes : 1;
 
+  /// \brief Whether this module came from a "private" module map, found next
+  /// to a regular (public) module map.
+  unsigned ModuleMapIsPrivate : 1;
+
   /// \brief Describes the visibility of the various names within a
   /// particular module.
   enum NameVisibilityKind {

lib/Basic/Module.cpp

@@ -44,7 +44,8 @@ Module::Module(StringRef Name, SourceLocation DefinitionLoc, Module *Parent,
       IsSystem(false), IsExternC(false), IsInferred(false),
       InferSubmodules(false), InferExplicitSubmodules(false),
       InferExportWildcard(false), ConfigMacrosExhaustive(false),
-      NoUndeclaredIncludes(false), NameVisibility(Hidden) {
+      NoUndeclaredIncludes(false), ModuleMapIsPrivate(false),
+      NameVisibility(Hidden) {
   if (Parent) {
     if (!Parent->isAvailable())
       IsAvailable = false;
@@ -54,6 +55,8 @@ Module::Module(StringRef Name, SourceLocation DefinitionLoc, Module *Parent,
       IsExternC = true;
     if (Parent->NoUndeclaredIncludes)
       NoUndeclaredIncludes = true;
+    if (Parent->ModuleMapIsPrivate)
+      ModuleMapIsPrivate = true;
     IsMissingRequirement = Parent->IsMissingRequirement;
     
     Parent->SubModuleIndex[Name] = Parent->SubModules.size();

lib/Lex/ModuleMap.cpp

@@ -1891,20 +1891,23 @@ void ModuleMapParser::parseModuleDecl() {
     ActiveModule->NoUndeclaredIncludes = true;
   ActiveModule->Directory = Directory;
 
+  StringRef MapFileName(ModuleMapFile->getName());
+  if (MapFileName.endswith("module.private.modulemap") ||
+      MapFileName.endswith("module_private.map")) {
+    ActiveModule->ModuleMapIsPrivate = true;
+  }
 
   // Private modules named as FooPrivate, Foo.Private or similar are likely a
   // user error; provide warnings, notes and fixits to direct users to use
   // Foo_Private instead.
   SourceLocation StartLoc =
       SourceMgr.getLocForStartOfFile(SourceMgr.getMainFileID());
-  StringRef MapFileName(ModuleMapFile->getName());
   if (Map.HeaderInfo.getHeaderSearchOpts().ImplicitModuleMaps &&
       !Diags.isIgnored(diag::warn_mmap_mismatched_private_submodule,
                        StartLoc) &&
       !Diags.isIgnored(diag::warn_mmap_mismatched_private_module_name,
                        StartLoc) &&
-      (MapFileName.endswith("module.private.modulemap") ||
-       MapFileName.endswith("module_private.map")))
+      ActiveModule->ModuleMapIsPrivate)
     diagnosePrivateModules(Map, Diags, ActiveModule, LastInlineParentLoc);
 
   bool Done = false;

lib/Serialization/ASTReader.cpp

@@ -4980,7 +4980,7 @@ ASTReader::ReadSubmoduleBlock(ModuleFile &F, unsigned ClientLoadCapabilities) {
       break;
 
     case SUBMODULE_DEFINITION: {
-      if (Record.size() < 8) {
+      if (Record.size() < 12) {
         Error("malformed module definition");
         return Failure;
       }
@@ -4998,6 +4998,7 @@ ASTReader::ReadSubmoduleBlock(ModuleFile &F, unsigned ClientLoadCapabilities) {
       bool InferExplicitSubmodules = Record[Idx++];
       bool InferExportWildcard = Record[Idx++];
       bool ConfigMacrosExhaustive = Record[Idx++];
+      bool ModuleMapIsPrivate = Record[Idx++];
 
       Module *ParentModule = nullptr;
       if (Parent)
@@ -5045,6 +5046,7 @@ ASTReader::ReadSubmoduleBlock(ModuleFile &F, unsigned ClientLoadCapabilities) {
       CurrentModule->InferExplicitSubmodules = InferExplicitSubmodules;
       CurrentModule->InferExportWildcard = InferExportWildcard;
       CurrentModule->ConfigMacrosExhaustive = ConfigMacrosExhaustive;
+      CurrentModule->ModuleMapIsPrivate = ModuleMapIsPrivate;
       if (DeserializationListener)
         DeserializationListener->ModuleRead(GlobalID, CurrentModule);
 

lib/Serialization/ASTWriter.cpp

@@ -2809,6 +2809,7 @@ void ASTWriter::WriteSubmodules(Module *WritingModule) {
   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // InferExplicit...
   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // InferExportWild...
   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ConfigMacrosExh...
+  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ModuleMapIsPriv...
   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Name
   unsigned DefinitionAbbrev = Stream.EmitAbbrev(std::move(Abbrev));
 
@@ -2913,7 +2914,8 @@ void ASTWriter::WriteSubmodules(Module *WritingModule) {
                                          Mod->InferSubmodules,
                                          Mod->InferExplicitSubmodules,
                                          Mod->InferExportWildcard,
-                                         Mod->ConfigMacrosExhaustive};
+                                         Mod->ConfigMacrosExhaustive,
+                                         Mod->ModuleMapIsPrivate};
       Stream.EmitRecordWithBlob(DefinitionAbbrev, Record, Mod->Name);
     }