[all-commits] [llvm/llvm-project] 412552: [VFS] Add print/dump to the whole FileSystem hiera...

[Ben Barham via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 4125524112e00c61547e83804279ef7889c8636a
      https://github.com/llvm/llvm-project/commit/4125524112e00c61547e83804279ef7889c8636a
  Author: Ben Barham <ben_barham at apple.com>
  Date:   2022-03-17 (Thu, 17 Mar 2022)

  Changed paths:
    M llvm/include/llvm/Support/VirtualFileSystem.h
    M llvm/lib/Support/VirtualFileSystem.cpp
    M llvm/unittests/Support/VirtualFileSystemTest.cpp

  Log Message:
  -----------
  [VFS] Add print/dump to the whole FileSystem hierarchy

For now most are implemented by printing out the name of the filesystem,
but this can be expanded in the future. Only `OverlayFileSystem` and
`RedirectingFileSystem` are properly implemented in this patch.
  - `OverlayFileSystem`: Prints each filesystem in the order that any
    operations are actually run on them. Optionally prints recursively.
  - `RedirectingFileSystem`: Prints out all mappings, as well as the
    `ExternalFS`. Most of this was already implemented other than the
    handling for the `DirectoryRemap` case and to actually print out the
    mapping.

Each FS should implement `printImpl` rather than `print`, where the
latter just fowards to the former. This is to avoid spreading the
default arguments through to the subclasses (where we may miss updating
in the future).

Differential Revision: https://reviews.llvm.org/D121421