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//===- VirtualFileSystem.cpp - Virtual File System Layer --------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// This file implements the VirtualFileSystem interface.
//===----------------------------------------------------------------------===//
#include "clang/Basic/VirtualFileSystem.h"
#include "llvm/ADT/OwningPtr.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/SourceMgr.h"
#include "llvm/Support/Path.h"
using namespace clang;
using namespace clang::vfs;
using namespace llvm;
using llvm::sys::fs::file_status;
using llvm::sys::fs::file_type;
using llvm::sys::fs::perms;
using llvm::sys::fs::UniqueID;
Status::Status(const file_status &Status)
: UID(Status.getUniqueID()), MTime(Status.getLastModificationTime()),
User(Status.getUser()), Group(Status.getGroup()), Size(Status.getSize()),
Type(Status.type()), Perms(Status.permissions()) {}
Status::Status(StringRef Name, StringRef ExternalName, UniqueID UID,
sys::TimeValue MTime, uint32_t User, uint32_t Group,
uint64_t Size, file_type Type, perms Perms)
: Name(Name), ExternalName(ExternalName), UID(UID), MTime(MTime),
User(User), Group(Group), Size(Size), Type(Type), Perms(Perms) {}
bool Status::equivalent(const Status &Other) const {
return getUniqueID() == Other.getUniqueID();
}
bool Status::isDirectory() const {
return Type == file_type::directory_file;
}
bool Status::isRegularFile() const {
return Type == file_type::regular_file;
}
bool Status::isOther() const {
return exists() && !isRegularFile() && !isDirectory() && !isSymlink();
}
bool Status::isSymlink() const {
return Type == file_type::symlink_file;
}
bool Status::isStatusKnown() const {
return Type != file_type::status_error;
}
bool Status::exists() const {
return isStatusKnown() && Type != file_type::file_not_found;
}
File::~File() {}
FileSystem::~FileSystem() {}
error_code FileSystem::getBufferForFile(const llvm::Twine &Name,
OwningPtr<MemoryBuffer> &Result,
int64_t FileSize,
bool RequiresNullTerminator) {
llvm::OwningPtr<File> F;
if (error_code EC = openFileForRead(Name, F))
return EC;
error_code EC = F->getBuffer(Name, Result, FileSize, RequiresNullTerminator);
return EC;
}
//===-----------------------------------------------------------------------===/
// RealFileSystem implementation
//===-----------------------------------------------------------------------===/
/// \brief Wrapper around a raw file descriptor.
class RealFile : public File {
int FD;
friend class RealFileSystem;
RealFile(int FD) : FD(FD) {
assert(FD >= 0 && "Invalid or inactive file descriptor");
}
public:
~RealFile();
ErrorOr<Status> status() LLVM_OVERRIDE;
error_code getBuffer(const Twine &Name, OwningPtr<MemoryBuffer> &Result,
int64_t FileSize = -1,
bool RequiresNullTerminator = true) LLVM_OVERRIDE;
error_code close() LLVM_OVERRIDE;
};
RealFile::~RealFile() {
close();
}
ErrorOr<Status> RealFile::status() {
assert(FD != -1 && "cannot stat closed file");
file_status RealStatus;
if (error_code EC = sys::fs::status(FD, RealStatus))
return EC;
return Status(RealStatus);
}
error_code RealFile::getBuffer(const Twine &Name,
OwningPtr<MemoryBuffer> &Result,
int64_t FileSize, bool RequiresNullTerminator) {
assert(FD != -1 && "cannot get buffer for closed file");
return MemoryBuffer::getOpenFile(FD, Name.str().c_str(), Result, FileSize,
RequiresNullTerminator);
}
// FIXME: This is terrible, we need this for ::close.
#if !defined(_MSC_VER) && !defined(__MINGW32__)
#include <unistd.h>
#include <sys/uio.h>
#else
#include <io.h>
#ifndef S_ISFIFO
#define S_ISFIFO(x) (0)
#endif
#endif
error_code RealFile::close() {
if (::close(FD))
return error_code(errno, system_category());
FD = -1;
return error_code::success();
}
/// \brief The file system according to your operating system.
class RealFileSystem : public FileSystem {
public:
ErrorOr<Status> status(const Twine &Path) LLVM_OVERRIDE;
error_code openFileForRead(const Twine &Path,
OwningPtr<File> &Result) LLVM_OVERRIDE;
};
ErrorOr<Status> RealFileSystem::status(const Twine &Path) {
sys::fs::file_status RealStatus;
if (error_code EC = sys::fs::status(Path, RealStatus))
return EC;
Status Result(RealStatus);
Result.setName(Path.str());
Result.setExternalName(Path.str());
return Result;
}
error_code RealFileSystem::openFileForRead(const Twine &Name,
OwningPtr<File> &Result) {
int FD;
if (error_code EC = sys::fs::openFileForRead(Name, FD))
return EC;
Result.reset(new RealFile(FD));
return error_code::success();
}
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());
}
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