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Add an OverlayFileSystem class

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Provides a way to merge multiple vfs::FileSystem objects into a single
filesystem.

llvm-svn: 201635
This commit is contained in:
Ben Langmuir
2014-02-19 03:29:17 +00:00
parent 141a7b5402
commit 87ba87bc4d
4 changed files with 273 additions and 0 deletions
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33
clang/lib/Basic/VirtualFileSystem.cpp
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@@ -160,3 +160,36 @@ IntrusiveRefCntPtr<FileSystem> vfs::getRealFileSystem() {
static IntrusiveRefCntPtr<FileSystem> FS = new RealFileSystem();
return FS;
}
//===-----------------------------------------------------------------------===/
// OverlayFileSystem implementation
//===-----------------------------------------------------------------------===/
OverlayFileSystem::OverlayFileSystem(
IntrusiveRefCntPtr<FileSystem> BaseFS) {
pushOverlay(BaseFS);
}
void OverlayFileSystem::pushOverlay(IntrusiveRefCntPtr<FileSystem> FS) {
FSList.push_back(FS);
}
ErrorOr<Status> OverlayFileSystem::status(const Twine &Path) {
// FIXME: handle symlinks that cross file systems
for (iterator I = overlays_begin(), E = overlays_end(); I != E; ++I) {
ErrorOr<Status> Status = (*I)->status(Path);
if (Status || Status.getError() != errc::no_such_file_or_directory)
return Status;
}
return error_code(errc::no_such_file_or_directory, system_category());
}
error_code OverlayFileSystem::openFileForRead(const llvm::Twine &Path,
OwningPtr<File> &Result) {
// FIXME: handle symlinks that cross file systems
for (iterator I = overlays_begin(), E = overlays_end(); I != E; ++I) {
error_code EC = (*I)->openFileForRead(Path, Result);
if (!EC || EC != errc::no_such_file_or_directory)
return EC;
}
return error_code(errc::no_such_file_or_directory, system_category());
}