[PATCH] D13430: [VFS] Add an in-memory file system implementation.

[Benjamin Kramer via cfe-commits]

bkramer created this revision.
bkramer added a reviewer: klimek.
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This is a simple file system tree of memory buffers that can be filled by a
client. In conjunction with an OverlayFS it can be used to make virtual
files accessible right next to physical files. This can be used as a
replacement for the virtual file handling in FileManager and which I intend
to remove eventually.

[VFS] Add working directories to every virtual file system.

For RealFileSystem this is getcwd()/chdir(), the synthetic file systems can
make up one for themselves. OverlayFileSystem now synchronizes the working
directories when a new FS is added to the overlay or the overlay working
directory is set. This allows purely artificial file systems that have zero
ties to the underlying disks.

http://reviews.llvm.org/D13430

Files:
  include/clang/Basic/VirtualFileSystem.h
  lib/Basic/VirtualFileSystem.cpp
  unittests/Basic/VirtualFileSystemTest.cpp
  unittests/Tooling/RewriterTestContext.h

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