clang
3.9.0
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A file system that allows overlaying one AbstractFileSystem
on top of another.
More...
#include <VirtualFileSystem.h>
Public Types | |
typedef FileSystemList::reverse_iterator | iterator |
Public Member Functions | |
OverlayFileSystem (IntrusiveRefCntPtr< FileSystem > Base) | |
void | pushOverlay (IntrusiveRefCntPtr< FileSystem > FS) |
Pushes a file system on top of the stack. More... | |
llvm::ErrorOr< Status > | status (const Twine &Path) override |
Get the status of the entry at Path , if one exists. More... | |
llvm::ErrorOr< std::unique_ptr < File > > | openFileForRead (const Twine &Path) override |
Get a File object for the file at Path , if one exists. More... | |
directory_iterator | dir_begin (const Twine &Dir, std::error_code &EC) override |
Get a directory_iterator for Dir . More... | |
llvm::ErrorOr< std::string > | getCurrentWorkingDirectory () const override |
Get the working directory of this file system. More... | |
std::error_code | setCurrentWorkingDirectory (const Twine &Path) override |
Set the working directory. More... | |
iterator | overlays_begin () |
Get an iterator pointing to the most recently added file system. More... | |
iterator | overlays_end () |
Get an iterator pointing one-past the least recently added file system. More... | |
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virtual | ~FileSystem () |
llvm::ErrorOr< std::unique_ptr < llvm::MemoryBuffer > > | getBufferForFile (const Twine &Name, int64_t FileSize=-1, bool RequiresNullTerminator=true, bool IsVolatile=false) |
This is a convenience method that opens a file, gets its content and then closes the file. More... | |
bool | exists (const Twine &Path) |
Check whether a file exists. Provided for convenience. More... | |
std::error_code | makeAbsolute (SmallVectorImpl< char > &Path) const |
Make Path an absolute path. More... | |
A file system that allows overlaying one AbstractFileSystem
on top of another.
Consists of a stack of >=1 FileSystem
objects, which are treated as being one merged file system. When there is a directory that exists in more than one file system, the OverlayFileSystem
contains a directory containing the union of their contents. The attributes (permissions, etc.) of the top-most (most recently added) directory are used. When there is a file that exists in more than one file system, the file in the top-most file system overrides the other(s).
Definition at line 254 of file VirtualFileSystem.h.
typedef FileSystemList::reverse_iterator clang::vfs::OverlayFileSystem::iterator |
Definition at line 272 of file VirtualFileSystem.h.
OverlayFileSystem::OverlayFileSystem | ( | IntrusiveRefCntPtr< FileSystem > | Base | ) |
Definition at line 290 of file VirtualFileSystem.cpp.
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overridevirtual |
Get a directory_iterator for Dir
.
Implements clang::vfs::FileSystem.
Definition at line 397 of file VirtualFileSystem.cpp.
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overridevirtual |
Get the working directory of this file system.
Implements clang::vfs::FileSystem.
Definition at line 323 of file VirtualFileSystem.cpp.
Referenced by pushOverlay().
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overridevirtual |
Get a File
object for the file at Path
, if one exists.
Implements clang::vfs::FileSystem.
Definition at line 312 of file VirtualFileSystem.cpp.
References E, I, clang::format::make_error_code(), overlays_begin(), overlays_end(), and clang::Result.
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inline |
Get an iterator pointing to the most recently added file system.
Definition at line 275 of file VirtualFileSystem.h.
Referenced by openFileForRead(), and status().
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inline |
Get an iterator pointing one-past the least recently added file system.
Definition at line 279 of file VirtualFileSystem.h.
Referenced by openFileForRead(), and status().
void OverlayFileSystem::pushOverlay | ( | IntrusiveRefCntPtr< FileSystem > | FS | ) |
Pushes a file system on top of the stack.
Definition at line 294 of file VirtualFileSystem.cpp.
References getCurrentWorkingDirectory().
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overridevirtual |
Set the working directory.
This will affect all following operations on this file system and may propagate down for nested file systems.
Implements clang::vfs::FileSystem.
Definition at line 328 of file VirtualFileSystem.cpp.
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overridevirtual |
Get the status of the entry at Path
, if one exists.
Implements clang::vfs::FileSystem.
Definition at line 301 of file VirtualFileSystem.cpp.
References E, I, clang::format::make_error_code(), overlays_begin(), and overlays_end().