Extend virtual file system with `isLocal` method

Expose the `llvm::sys::fs::is_local` function through the VFS.

Differential revision: https://reviews.llvm.org/D54127

llvm-svn: 346372

1 files changed, 25 insertions, 0 deletions

diff --git a/llvm/lib/Support/VirtualFileSystem.cpp b/llvm/lib/Support/VirtualFileSystem.cpp
index 9440eac..e8b0435 100644
--- a/llvm/lib/Support/VirtualFileSystem.cpp
+++ b/llvm/lib/Support/VirtualFileSystem.cpp
@@ -136,6 +136,10 @@ std::error_code FileSystem::getRealPath(const Twine &Path,
   return errc::operation_not_permitted;
 }
 
+std::error_code FileSystem::isLocal(const Twine &Path, bool &Result) {
+  return errc::operation_not_permitted;
+}
+
 bool FileSystem::exists(const Twine &Path) {
   auto Status = status(Path);
   return Status && Status->exists();
@@ -233,6 +237,7 @@ public:
 
   llvm::ErrorOr<std::string> getCurrentWorkingDirectory() const override;
   std::error_code setCurrentWorkingDirectory(const Twine &Path) override;
+  std::error_code isLocal(const Twine &Path, bool &Result) override;
   std::error_code getRealPath(const Twine &Path,
                               SmallVectorImpl<char> &Output) const override;
 
@@ -288,6 +293,10 @@ std::error_code RealFileSystem::setCurrentWorkingDirectory(const Twine &Path) {
   return std::error_code();
 }
 
+std::error_code RealFileSystem::isLocal(const Twine &Path, bool &Result) {
+  return llvm::sys::fs::is_local(Path, Result);
+}
+
 std::error_code
 RealFileSystem::getRealPath(const Twine &Path,
                             SmallVectorImpl<char> &Output) const {
@@ -377,6 +386,13 @@ OverlayFileSystem::setCurrentWorkingDirectory(const Twine &Path) {
   return {};
 }
 
+std::error_code OverlayFileSystem::isLocal(const Twine &Path, bool &Result) {
+  for (auto &FS : FSList)
+    if (FS->exists(Path))
+      return FS->isLocal(Path, Result);
+  return errc::no_such_file_or_directory;
+}
+
 std::error_code
 OverlayFileSystem::getRealPath(const Twine &Path,
                                SmallVectorImpl<char> &Output) const {
@@ -913,6 +929,11 @@ InMemoryFileSystem::getRealPath(const Twine &Path,
   return {};
 }
 
+std::error_code InMemoryFileSystem::isLocal(const Twine &Path, bool &Result) {
+  Result = false;
+  return {};
+}
+
 } // namespace vfs
 } // namespace llvm
 
@@ -1170,6 +1191,10 @@ public:
     return ExternalFS->setCurrentWorkingDirectory(Path);
   }
 
+  std::error_code isLocal(const Twine &Path, bool &Result) override {
+    return ExternalFS->isLocal(Path, Result);
+  }
+
   directory_iterator dir_begin(const Twine &Dir, std::error_code &EC) override {
     ErrorOr<Entry *> E = lookupPath(Dir);
     if (!E) {