Vendor import of clang release_32 branch r168974 (effectively, 3.2 RC2):vendor/clang/clang-release_32-r168974

http://llvm.org/svn/llvm-project/cfe/branches/release_32@168974

1 files changed, 44 insertions, 3 deletions

diff --git a/lib/Lex/HeaderSearch.cpp b/lib/Lex/HeaderSearch.cpp
index bb3a67378ad5..67000b682982 100644
--- a/lib/Lex/HeaderSearch.cpp
+++ b/lib/Lex/HeaderSearch.cpp
@@ -12,6 +12,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "clang/Lex/HeaderSearch.h"
+#include "clang/Lex/HeaderSearchOptions.h"
 #include "clang/Lex/HeaderMap.h"
 #include "clang/Lex/Lexer.h"
 #include "clang/Basic/Diagnostic.h"
@@ -38,10 +39,11 @@ HeaderFileInfo::getControllingMacro(ExternalIdentifierLookup *External) {
 
 ExternalHeaderFileInfoSource::~ExternalHeaderFileInfoSource() {}
 
-HeaderSearch::HeaderSearch(FileManager &FM, DiagnosticsEngine &Diags,
+HeaderSearch::HeaderSearch(llvm::IntrusiveRefCntPtr<HeaderSearchOptions> HSOpts,
+                           FileManager &FM, DiagnosticsEngine &Diags,
                            const LangOptions &LangOpts, 
                            const TargetInfo *Target)
-  : FileMgr(FM), Diags(Diags), FrameworkMap(64), 
+  : HSOpts(HSOpts), FileMgr(FM), FrameworkMap(64),
     ModMap(FileMgr, *Diags.getClient(), LangOpts, Target)
 {
   AngledDirIdx = 0;
@@ -905,7 +907,20 @@ Module *HeaderSearch::loadFrameworkModule(StringRef Name,
   SubmodulePath.push_back(Name);
   
   // Walk the directory structure to find any enclosing frameworks.
+#ifdef LLVM_ON_UNIX
+  // Note: as an egregious but useful hack we use the real path here, because
+  // frameworks moving from top-level frameworks to embedded frameworks tend
+  // to be symlinked from the top-level location to the embedded location,
+  // and we need to resolve lookups as if we had found the embedded location.
+  char RealDirName[PATH_MAX];
+  StringRef DirName;
+  if (realpath(Dir->getName(), RealDirName))
+    DirName = RealDirName;
+  else
+    DirName = Dir->getName();
+#else
   StringRef DirName = Dir->getName();
+#endif
   do {
     // Get the parent directory name.
     DirName = llvm::sys::path::parent_path(DirName);
@@ -924,7 +939,33 @@ Module *HeaderSearch::loadFrameworkModule(StringRef Name,
       TopFrameworkDir = Dir;
     }
   } while (true);
-  
+
+  // Determine whether we're allowed to infer a module map.
+  bool canInfer = false;
+  if (llvm::sys::path::has_parent_path(TopFrameworkDir->getName())) {
+    // Figure out the parent path.
+    StringRef Parent = llvm::sys::path::parent_path(TopFrameworkDir->getName());
+    if (const DirectoryEntry *ParentDir = FileMgr.getDirectory(Parent)) {
+      // If there's a module map file in the parent directory, it can
+      // explicitly allow us to infer framework modules.
+      switch (loadModuleMapFile(ParentDir)) {
+        case LMM_AlreadyLoaded:
+        case LMM_NewlyLoaded: {
+          StringRef Name = llvm::sys::path::stem(TopFrameworkDir->getName());
+          canInfer = ModMap.canInferFrameworkModule(ParentDir, Name, IsSystem);
+          break;
+        }
+        case LMM_InvalidModuleMap:
+        case LMM_NoDirectory:
+          break;
+      }
+    }
+  }
+
+  // If we're not allowed to infer a module map, we're done.
+  if (!canInfer)
+    return 0;
+
   // Try to infer a module map from the top-level framework directory.
   Module *Result = ModMap.inferFrameworkModule(SubmodulePath.back(), 
                                                TopFrameworkDir,