Teach subframework header lookup to suggest modules <rdar://problem/13176200>.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@174683 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 26 insertions, 4 deletions

diff --git a/lib/Lex/HeaderSearch.cpp b/lib/Lex/HeaderSearch.cpp
index 3bf38e00cd..3b6c5ccde4 100644
--- a/lib/Lex/HeaderSearch.cpp
+++ b/lib/Lex/HeaderSearch.cpp
@@ -665,7 +665,8 @@ const FileEntry *HeaderSearch::
 LookupSubframeworkHeader(StringRef Filename,
                          const FileEntry *ContextFileEnt,
                          SmallVectorImpl<char> *SearchPath,
-                         SmallVectorImpl<char> *RelativePath) {
+                         SmallVectorImpl<char> *RelativePath,
+                         Module **SuggestedModule) {
   assert(ContextFileEnt && "No context file?");
 
   // Framework names must have a '/' in the filename.  Find it.
@@ -754,6 +755,26 @@ LookupSubframeworkHeader(StringRef Filename,
   // of evaluation.
   unsigned DirInfo = getFileInfo(ContextFileEnt).DirInfo;
   getFileInfo(FE).DirInfo = DirInfo;
+
+  // If we're supposed to suggest a module, look for one now.
+  if (SuggestedModule) {
+    // Find the top-level framework based on this framework.
+    FrameworkName.pop_back(); // remove the trailing '/'
+    SmallVector<std::string, 4> SubmodulePath;
+    const DirectoryEntry *TopFrameworkDir
+      = ::getTopFrameworkDir(FileMgr, FrameworkName, SubmodulePath);
+    
+    // Determine the name of the top-level framework.
+    StringRef ModuleName = llvm::sys::path::stem(TopFrameworkDir->getName());
+
+    // Load this framework module. If that succeeds, find the suggested module
+    // for this header, if any.
+    bool IsSystem = false;
+    if (loadFrameworkModule(ModuleName, TopFrameworkDir, IsSystem)) {
+      *SuggestedModule = findModuleForHeader(FE);
+    }
+  }
+
   return FE;
 }
 
diff --git a/lib/Lex/PPDirectives.cpp b/lib/Lex/PPDirectives.cpp
index 74376e47ac..3356637b20 100644
--- a/lib/Lex/PPDirectives.cpp
+++ b/lib/Lex/PPDirectives.cpp
@@ -537,11 +537,11 @@ const FileEntry *Preprocessor::LookupFile(
   // Otherwise, see if this is a subframework header.  If so, this is relative
   // to one of the headers on the #include stack.  Walk the list of the current
   // headers on the #include stack and pass them to HeaderInfo.
-  // FIXME: SuggestedModule!
   if (IsFileLexer()) {
     if ((CurFileEnt = SourceMgr.getFileEntryForID(CurPPLexer->getFileID())))
       if ((FE = HeaderInfo.LookupSubframeworkHeader(Filename, CurFileEnt,
-                                                    SearchPath, RelativePath)))
+                                                    SearchPath, RelativePath,
+                                                    SuggestedModule)))
         return FE;
   }
 
@@ -551,7 +551,8 @@ const FileEntry *Preprocessor::LookupFile(
       if ((CurFileEnt =
            SourceMgr.getFileEntryForID(ISEntry.ThePPLexer->getFileID())))
         if ((FE = HeaderInfo.LookupSubframeworkHeader(
-                Filename, CurFileEnt, SearchPath, RelativePath)))
+                Filename, CurFileEnt, SearchPath, RelativePath,
+                SuggestedModule)))
           return FE;
     }
   }