[clang-tidy] Add -vfsoverlay flag

Summary:
It allows to remap and override files and directories on disk when
running clang-tidy. The intended use case for the flag is running
standalone clang-tidy binary for IDE and editor integration.

Patch by Vladimir Plyashkun.

Reviewers: alexfh, benlangmuir, ilya-biryukov

Reviewed By: ilya-biryukov

Subscribers: ilya-biryukov, cfe-commits

Tags: #clang-tools-extra

Differential Revision: https://reviews.llvm.org/D41535

git-svn-id: https://llvm.org/svn/llvm-project/clang-tools-extra/trunk@323196 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 11 insertions, 6 deletions

diff --git a/clang-tidy/ClangTidy.cpp b/clang-tidy/ClangTidy.cpp
index c3ddc458..a68111b4 100644
--- a/clang-tidy/ClangTidy.cpp
+++ b/clang-tidy/ClangTidy.cpp
@@ -89,8 +89,9 @@ private:
 
 class ErrorReporter {
 public:
-  ErrorReporter(ClangTidyContext &Context, bool ApplyFixes)
-      : Files(FileSystemOptions()), DiagOpts(new DiagnosticOptions()),
+  ErrorReporter(ClangTidyContext &Context, bool ApplyFixes,
+                llvm::IntrusiveRefCntPtr<vfs::FileSystem> BaseFS)
+      : Files(FileSystemOptions(), BaseFS), DiagOpts(new DiagnosticOptions()),
         DiagPrinter(new TextDiagnosticPrinter(llvm::outs(), &*DiagOpts)),
         Diags(IntrusiveRefCntPtr<DiagnosticIDs>(new DiagnosticIDs), &*DiagOpts,
               DiagPrinter),
@@ -474,8 +475,11 @@ ClangTidyOptions::OptionMap getCheckOptions(const ClangTidyOptions &Options) {
 
 void runClangTidy(clang::tidy::ClangTidyContext &Context,
                   const CompilationDatabase &Compilations,
-                  ArrayRef<std::string> InputFiles, ProfileData *Profile) {
-  ClangTool Tool(Compilations, InputFiles);
+                  ArrayRef<std::string> InputFiles,
+                  llvm::IntrusiveRefCntPtr<vfs::FileSystem> BaseFS,
+                  ProfileData *Profile) {
+  ClangTool Tool(Compilations, InputFiles,
+                 std::make_shared<PCHContainerOperations>(), BaseFS);
 
   // Add extra arguments passed by the clang-tidy command-line.
   ArgumentsAdjuster PerFileExtraArgumentsInserter =
@@ -546,8 +550,9 @@ void runClangTidy(clang::tidy::ClangTidyContext &Context,
 }
 
 void handleErrors(ClangTidyContext &Context, bool Fix,
-                  unsigned &WarningsAsErrorsCount) {
-  ErrorReporter Reporter(Context, Fix);
+                  unsigned &WarningsAsErrorsCount,
+                  llvm::IntrusiveRefCntPtr<vfs::FileSystem> BaseFS) {
+  ErrorReporter Reporter(Context, Fix, BaseFS);
   vfs::FileSystem &FileSystem =
       *Reporter.getSourceManager().getFileManager().getVirtualFileSystem();
   auto InitialWorkingDir = FileSystem.getCurrentWorkingDirectory();