Implement -working-directory.

When -working-directory is passed in command line, file paths are resolved relative to the specified directory.
This helps both when using libclang (where we can't require the user to actually change the working directory)
and to help reproduce test cases when the reproduction work comes along.

--FileSystemOptions is introduced which controls how file system operations are performed (currently it just contains
 the working directory value if set).
--FileSystemOptions are passed around to various interfaces that perform file operations.
--Opening & reading the content of files should be done only through FileManager. This is useful in general since
 file operations will be abstracted in the future for the reproduction mechanism.

FileSystemOptions is independent of FileManager so that we can have multiple translation units sharing the same
FileManager but with different FileSystemOptions.

Addresses rdar://8583824.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@118203 91177308-0d34-0410-b5e6-96231b3b80d8

4 files changed, 15 insertions, 4 deletions

diff --git a/include/clang/Lex/HeaderMap.h b/include/clang/Lex/HeaderMap.h
index 9837e29653..4f17ae3ec3 100644
--- a/include/clang/Lex/HeaderMap.h
+++ b/include/clang/Lex/HeaderMap.h
@@ -21,6 +21,7 @@ namespace llvm {
 namespace clang {
   class FileEntry;
   class FileManager;
+  class FileSystemOptions;
   struct HMapBucket;
   struct HMapHeader;
 
@@ -43,11 +44,13 @@ public:
 
   /// HeaderMap::Create - This attempts to load the specified file as a header
   /// map.  If it doesn't look like a HeaderMap, it gives up and returns null.
-  static const HeaderMap *Create(const FileEntry *FE);
+  static const HeaderMap *Create(const FileEntry *FE, FileManager &FM,
+                                 const FileSystemOptions &FSOpts);
 
   /// LookupFile - Check to see if the specified relative filename is located in
   /// this HeaderMap.  If so, open it and return its FileEntry.
-  const FileEntry *LookupFile(llvm::StringRef Filename, FileManager &FM) const;
+  const FileEntry *LookupFile(llvm::StringRef Filename, FileManager &FM,
+                              const FileSystemOptions &FileSystemOpts) const;
 
   /// getFileName - Return the filename of the headermap.
   const char *getFileName() const;
diff --git a/include/clang/Lex/HeaderSearch.h b/include/clang/Lex/HeaderSearch.h
index 80b38dee06..7d467a5680 100644
--- a/include/clang/Lex/HeaderSearch.h
+++ b/include/clang/Lex/HeaderSearch.h
@@ -23,6 +23,7 @@ namespace clang {
 class ExternalIdentifierLookup;
 class FileEntry;
 class FileManager;
+class FileSystemOptions;
 class IdentifierInfo;
 
 /// HeaderFileInfo - The preprocessor keeps track of this information for each
@@ -71,6 +72,7 @@ struct HeaderFileInfo {
 /// file referenced by a #include or #include_next, (sub-)framework lookup, etc.
 class HeaderSearch {
   FileManager &FileMgr;
+  const FileSystemOptions &FileSystemOpts;
 
   /// #include search path information.  Requests for #include "x" search the
   /// directory of the #including file first, then each directory in SearchDirs
@@ -118,10 +120,11 @@ class HeaderSearch {
   explicit HeaderSearch(const HeaderSearch&);
   void operator=(const HeaderSearch&);
 public:
-  HeaderSearch(FileManager &FM);
+  HeaderSearch(FileManager &FM, const FileSystemOptions &FSOpts);
   ~HeaderSearch();
 
   FileManager &getFileMgr() const { return FileMgr; }
+  const FileSystemOptions &getFileSystemOpts() const { return FileSystemOpts; }
 
   /// SetSearchPaths - Interface for setting the file search paths.
   ///
diff --git a/include/clang/Lex/PTHManager.h b/include/clang/Lex/PTHManager.h
index 5e8a4f144c..a3787e3ffe 100644
--- a/include/clang/Lex/PTHManager.h
+++ b/include/clang/Lex/PTHManager.h
@@ -119,7 +119,9 @@ public:
 
   /// Create - This method creates PTHManager objects.  The 'file' argument
   ///  is the name of the PTH file.  This method returns NULL upon failure.
-  static PTHManager *Create(const std::string& file, Diagnostic &Diags);
+  static PTHManager *Create(const std::string& file, FileManager &FileMgr,
+                            const FileSystemOptions &FSOpts,
+                            Diagnostic &Diags);
 
   void setPreprocessor(Preprocessor *pp) { PP = pp; }
 
diff --git a/include/clang/Lex/Preprocessor.h b/include/clang/Lex/Preprocessor.h
index 7b138884e0..b45f47bf11 100644
--- a/include/clang/Lex/Preprocessor.h
+++ b/include/clang/Lex/Preprocessor.h
@@ -35,6 +35,7 @@ namespace clang {
 class SourceManager;
 class ExternalPreprocessorSource;
 class FileManager;
+class FileSystemOptions;
 class FileEntry;
 class HeaderSearch;
 class PragmaNamespace;
@@ -57,6 +58,7 @@ class Preprocessor {
   LangOptions        Features;
   const TargetInfo  &Target;
   FileManager       &FileMgr;
+  const FileSystemOptions &FileSystemOpts;
   SourceManager     &SourceMgr;
   ScratchBuffer     *ScratchBuf;
   HeaderSearch      &HeaderInfo;
@@ -279,6 +281,7 @@ public:
   const LangOptions &getLangOptions() const { return Features; }
   const TargetInfo &getTargetInfo() const { return Target; }
   FileManager &getFileManager() const { return FileMgr; }
+  const FileSystemOptions &getFileSystemOpts() const { return FileSystemOpts; }
   SourceManager &getSourceManager() const { return SourceMgr; }
   HeaderSearch &getHeaderSearchInfo() const { return HeaderInfo; }