da6642a1c8
This is part of an effort to migrate from llvm::Optional to std::optional: https://discourse.llvm.org/t/deprecating-llvm-optional-x-hasvalue-getvalue-getvalueor/63716
2849 lines
97 KiB
C++
2849 lines
97 KiB
C++
//===- VirtualFileSystem.cpp - Virtual File System Layer ------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the VirtualFileSystem interface.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/VirtualFileSystem.h"
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/IntrusiveRefCntPtr.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/ADT/StringSet.h"
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#include "llvm/ADT/Twine.h"
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#include "llvm/ADT/iterator_range.h"
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#include "llvm/Config/llvm-config.h"
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#include "llvm/Support/Casting.h"
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#include "llvm/Support/Chrono.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/Errc.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/ErrorOr.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/FileSystem/UniqueID.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/Path.h"
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#include "llvm/Support/SMLoc.h"
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#include "llvm/Support/SourceMgr.h"
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#include "llvm/Support/YAMLParser.h"
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#include "llvm/Support/raw_ostream.h"
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#include <algorithm>
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#include <atomic>
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#include <cassert>
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#include <cstdint>
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#include <iterator>
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#include <limits>
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#include <memory>
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#include <optional>
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#include <string>
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#include <system_error>
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#include <utility>
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#include <vector>
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using namespace llvm;
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using namespace llvm::vfs;
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using llvm::sys::fs::file_t;
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using llvm::sys::fs::file_status;
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using llvm::sys::fs::file_type;
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using llvm::sys::fs::kInvalidFile;
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using llvm::sys::fs::perms;
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using llvm::sys::fs::UniqueID;
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Status::Status(const file_status &Status)
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: UID(Status.getUniqueID()), MTime(Status.getLastModificationTime()),
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User(Status.getUser()), Group(Status.getGroup()), Size(Status.getSize()),
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Type(Status.type()), Perms(Status.permissions()) {}
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Status::Status(const Twine &Name, UniqueID UID, sys::TimePoint<> MTime,
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uint32_t User, uint32_t Group, uint64_t Size, file_type Type,
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perms Perms)
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: Name(Name.str()), UID(UID), MTime(MTime), User(User), Group(Group),
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Size(Size), Type(Type), Perms(Perms) {}
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Status Status::copyWithNewSize(const Status &In, uint64_t NewSize) {
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return Status(In.getName(), In.getUniqueID(), In.getLastModificationTime(),
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In.getUser(), In.getGroup(), NewSize, In.getType(),
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In.getPermissions());
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}
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Status Status::copyWithNewName(const Status &In, const Twine &NewName) {
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return Status(NewName, In.getUniqueID(), In.getLastModificationTime(),
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In.getUser(), In.getGroup(), In.getSize(), In.getType(),
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In.getPermissions());
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}
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Status Status::copyWithNewName(const file_status &In, const Twine &NewName) {
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return Status(NewName, In.getUniqueID(), In.getLastModificationTime(),
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In.getUser(), In.getGroup(), In.getSize(), In.type(),
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In.permissions());
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}
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bool Status::equivalent(const Status &Other) const {
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assert(isStatusKnown() && Other.isStatusKnown());
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return getUniqueID() == Other.getUniqueID();
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}
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bool Status::isDirectory() const { return Type == file_type::directory_file; }
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bool Status::isRegularFile() const { return Type == file_type::regular_file; }
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bool Status::isOther() const {
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return exists() && !isRegularFile() && !isDirectory() && !isSymlink();
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}
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bool Status::isSymlink() const { return Type == file_type::symlink_file; }
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bool Status::isStatusKnown() const { return Type != file_type::status_error; }
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bool Status::exists() const {
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return isStatusKnown() && Type != file_type::file_not_found;
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}
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File::~File() = default;
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FileSystem::~FileSystem() = default;
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ErrorOr<std::unique_ptr<MemoryBuffer>>
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FileSystem::getBufferForFile(const llvm::Twine &Name, int64_t FileSize,
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bool RequiresNullTerminator, bool IsVolatile) {
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auto F = openFileForRead(Name);
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if (!F)
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return F.getError();
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return (*F)->getBuffer(Name, FileSize, RequiresNullTerminator, IsVolatile);
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}
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std::error_code FileSystem::makeAbsolute(SmallVectorImpl<char> &Path) const {
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if (llvm::sys::path::is_absolute(Path))
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return {};
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auto WorkingDir = getCurrentWorkingDirectory();
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if (!WorkingDir)
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return WorkingDir.getError();
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llvm::sys::fs::make_absolute(WorkingDir.get(), Path);
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return {};
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}
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std::error_code FileSystem::getRealPath(const Twine &Path,
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SmallVectorImpl<char> &Output) const {
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return errc::operation_not_permitted;
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}
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std::error_code FileSystem::isLocal(const Twine &Path, bool &Result) {
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return errc::operation_not_permitted;
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}
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bool FileSystem::exists(const Twine &Path) {
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auto Status = status(Path);
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return Status && Status->exists();
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}
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#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
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void FileSystem::dump() const { print(dbgs(), PrintType::RecursiveContents); }
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#endif
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#ifndef NDEBUG
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static bool isTraversalComponent(StringRef Component) {
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return Component.equals("..") || Component.equals(".");
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}
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static bool pathHasTraversal(StringRef Path) {
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using namespace llvm::sys;
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for (StringRef Comp : llvm::make_range(path::begin(Path), path::end(Path)))
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if (isTraversalComponent(Comp))
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return true;
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return false;
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}
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#endif
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//===-----------------------------------------------------------------------===/
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// RealFileSystem implementation
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//===-----------------------------------------------------------------------===/
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namespace {
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/// Wrapper around a raw file descriptor.
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class RealFile : public File {
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friend class RealFileSystem;
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file_t FD;
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Status S;
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std::string RealName;
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RealFile(file_t RawFD, StringRef NewName, StringRef NewRealPathName)
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: FD(RawFD), S(NewName, {}, {}, {}, {}, {},
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llvm::sys::fs::file_type::status_error, {}),
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RealName(NewRealPathName.str()) {
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assert(FD != kInvalidFile && "Invalid or inactive file descriptor");
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}
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public:
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~RealFile() override;
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ErrorOr<Status> status() override;
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ErrorOr<std::string> getName() override;
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ErrorOr<std::unique_ptr<MemoryBuffer>> getBuffer(const Twine &Name,
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int64_t FileSize,
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bool RequiresNullTerminator,
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bool IsVolatile) override;
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std::error_code close() override;
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void setPath(const Twine &Path) override;
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};
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} // namespace
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RealFile::~RealFile() { close(); }
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ErrorOr<Status> RealFile::status() {
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assert(FD != kInvalidFile && "cannot stat closed file");
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if (!S.isStatusKnown()) {
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file_status RealStatus;
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if (std::error_code EC = sys::fs::status(FD, RealStatus))
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return EC;
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S = Status::copyWithNewName(RealStatus, S.getName());
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}
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return S;
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}
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ErrorOr<std::string> RealFile::getName() {
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return RealName.empty() ? S.getName().str() : RealName;
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}
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ErrorOr<std::unique_ptr<MemoryBuffer>>
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RealFile::getBuffer(const Twine &Name, int64_t FileSize,
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bool RequiresNullTerminator, bool IsVolatile) {
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assert(FD != kInvalidFile && "cannot get buffer for closed file");
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return MemoryBuffer::getOpenFile(FD, Name, FileSize, RequiresNullTerminator,
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IsVolatile);
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}
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std::error_code RealFile::close() {
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std::error_code EC = sys::fs::closeFile(FD);
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FD = kInvalidFile;
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return EC;
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}
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void RealFile::setPath(const Twine &Path) {
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RealName = Path.str();
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if (auto Status = status())
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S = Status.get().copyWithNewName(Status.get(), Path);
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}
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namespace {
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/// A file system according to your operating system.
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/// This may be linked to the process's working directory, or maintain its own.
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///
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/// Currently, its own working directory is emulated by storing the path and
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/// sending absolute paths to llvm::sys::fs:: functions.
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/// A more principled approach would be to push this down a level, modelling
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/// the working dir as an llvm::sys::fs::WorkingDir or similar.
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/// This would enable the use of openat()-style functions on some platforms.
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class RealFileSystem : public FileSystem {
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public:
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explicit RealFileSystem(bool LinkCWDToProcess) {
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if (!LinkCWDToProcess) {
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SmallString<128> PWD, RealPWD;
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if (llvm::sys::fs::current_path(PWD))
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return; // Awful, but nothing to do here.
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if (llvm::sys::fs::real_path(PWD, RealPWD))
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WD = {PWD, PWD};
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else
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WD = {PWD, RealPWD};
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}
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}
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ErrorOr<Status> status(const Twine &Path) override;
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ErrorOr<std::unique_ptr<File>> openFileForRead(const Twine &Path) override;
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directory_iterator dir_begin(const Twine &Dir, std::error_code &EC) override;
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llvm::ErrorOr<std::string> getCurrentWorkingDirectory() const override;
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std::error_code setCurrentWorkingDirectory(const Twine &Path) override;
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std::error_code isLocal(const Twine &Path, bool &Result) override;
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std::error_code getRealPath(const Twine &Path,
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SmallVectorImpl<char> &Output) const override;
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protected:
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void printImpl(raw_ostream &OS, PrintType Type,
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unsigned IndentLevel) const override;
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private:
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// If this FS has its own working dir, use it to make Path absolute.
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// The returned twine is safe to use as long as both Storage and Path live.
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Twine adjustPath(const Twine &Path, SmallVectorImpl<char> &Storage) const {
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if (!WD)
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return Path;
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Path.toVector(Storage);
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sys::fs::make_absolute(WD->Resolved, Storage);
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return Storage;
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}
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struct WorkingDirectory {
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// The current working directory, without symlinks resolved. (echo $PWD).
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SmallString<128> Specified;
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// The current working directory, with links resolved. (readlink .).
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SmallString<128> Resolved;
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};
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std::optional<WorkingDirectory> WD;
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};
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} // namespace
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ErrorOr<Status> RealFileSystem::status(const Twine &Path) {
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SmallString<256> Storage;
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sys::fs::file_status RealStatus;
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if (std::error_code EC =
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sys::fs::status(adjustPath(Path, Storage), RealStatus))
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return EC;
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return Status::copyWithNewName(RealStatus, Path);
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}
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ErrorOr<std::unique_ptr<File>>
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RealFileSystem::openFileForRead(const Twine &Name) {
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SmallString<256> RealName, Storage;
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Expected<file_t> FDOrErr = sys::fs::openNativeFileForRead(
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adjustPath(Name, Storage), sys::fs::OF_None, &RealName);
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if (!FDOrErr)
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return errorToErrorCode(FDOrErr.takeError());
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return std::unique_ptr<File>(
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new RealFile(*FDOrErr, Name.str(), RealName.str()));
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}
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llvm::ErrorOr<std::string> RealFileSystem::getCurrentWorkingDirectory() const {
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if (WD)
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return std::string(WD->Specified.str());
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SmallString<128> Dir;
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if (std::error_code EC = llvm::sys::fs::current_path(Dir))
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return EC;
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return std::string(Dir.str());
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}
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std::error_code RealFileSystem::setCurrentWorkingDirectory(const Twine &Path) {
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if (!WD)
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return llvm::sys::fs::set_current_path(Path);
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SmallString<128> Absolute, Resolved, Storage;
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adjustPath(Path, Storage).toVector(Absolute);
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bool IsDir;
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if (auto Err = llvm::sys::fs::is_directory(Absolute, IsDir))
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return Err;
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if (!IsDir)
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return std::make_error_code(std::errc::not_a_directory);
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if (auto Err = llvm::sys::fs::real_path(Absolute, Resolved))
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return Err;
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WD = {Absolute, Resolved};
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return std::error_code();
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}
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std::error_code RealFileSystem::isLocal(const Twine &Path, bool &Result) {
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SmallString<256> Storage;
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return llvm::sys::fs::is_local(adjustPath(Path, Storage), Result);
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}
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std::error_code
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RealFileSystem::getRealPath(const Twine &Path,
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SmallVectorImpl<char> &Output) const {
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SmallString<256> Storage;
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return llvm::sys::fs::real_path(adjustPath(Path, Storage), Output);
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}
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void RealFileSystem::printImpl(raw_ostream &OS, PrintType Type,
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unsigned IndentLevel) const {
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printIndent(OS, IndentLevel);
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OS << "RealFileSystem using ";
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if (WD)
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OS << "own";
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else
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OS << "process";
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OS << " CWD\n";
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}
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IntrusiveRefCntPtr<FileSystem> vfs::getRealFileSystem() {
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static IntrusiveRefCntPtr<FileSystem> FS(new RealFileSystem(true));
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return FS;
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}
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std::unique_ptr<FileSystem> vfs::createPhysicalFileSystem() {
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return std::make_unique<RealFileSystem>(false);
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}
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namespace {
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class RealFSDirIter : public llvm::vfs::detail::DirIterImpl {
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llvm::sys::fs::directory_iterator Iter;
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public:
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RealFSDirIter(const Twine &Path, std::error_code &EC) : Iter(Path, EC) {
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if (Iter != llvm::sys::fs::directory_iterator())
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CurrentEntry = directory_entry(Iter->path(), Iter->type());
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}
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std::error_code increment() override {
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std::error_code EC;
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Iter.increment(EC);
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CurrentEntry = (Iter == llvm::sys::fs::directory_iterator())
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? directory_entry()
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: directory_entry(Iter->path(), Iter->type());
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return EC;
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}
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};
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} // namespace
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directory_iterator RealFileSystem::dir_begin(const Twine &Dir,
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std::error_code &EC) {
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SmallString<128> Storage;
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return directory_iterator(
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std::make_shared<RealFSDirIter>(adjustPath(Dir, Storage), EC));
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}
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//===-----------------------------------------------------------------------===/
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// OverlayFileSystem implementation
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//===-----------------------------------------------------------------------===/
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OverlayFileSystem::OverlayFileSystem(IntrusiveRefCntPtr<FileSystem> BaseFS) {
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FSList.push_back(std::move(BaseFS));
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}
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void OverlayFileSystem::pushOverlay(IntrusiveRefCntPtr<FileSystem> FS) {
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FSList.push_back(FS);
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// Synchronize added file systems by duplicating the working directory from
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// the first one in the list.
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FS->setCurrentWorkingDirectory(getCurrentWorkingDirectory().get());
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}
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ErrorOr<Status> OverlayFileSystem::status(const Twine &Path) {
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// FIXME: handle symlinks that cross file systems
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for (iterator I = overlays_begin(), E = overlays_end(); I != E; ++I) {
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ErrorOr<Status> Status = (*I)->status(Path);
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if (Status || Status.getError() != llvm::errc::no_such_file_or_directory)
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return Status;
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}
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return make_error_code(llvm::errc::no_such_file_or_directory);
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}
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ErrorOr<std::unique_ptr<File>>
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OverlayFileSystem::openFileForRead(const llvm::Twine &Path) {
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// FIXME: handle symlinks that cross file systems
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for (iterator I = overlays_begin(), E = overlays_end(); I != E; ++I) {
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auto Result = (*I)->openFileForRead(Path);
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if (Result || Result.getError() != llvm::errc::no_such_file_or_directory)
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return Result;
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}
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return make_error_code(llvm::errc::no_such_file_or_directory);
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}
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llvm::ErrorOr<std::string>
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OverlayFileSystem::getCurrentWorkingDirectory() const {
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// All file systems are synchronized, just take the first working directory.
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return FSList.front()->getCurrentWorkingDirectory();
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}
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std::error_code
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OverlayFileSystem::setCurrentWorkingDirectory(const Twine &Path) {
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for (auto &FS : FSList)
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if (std::error_code EC = FS->setCurrentWorkingDirectory(Path))
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return EC;
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return {};
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}
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std::error_code OverlayFileSystem::isLocal(const Twine &Path, bool &Result) {
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for (auto &FS : FSList)
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if (FS->exists(Path))
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return FS->isLocal(Path, Result);
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return errc::no_such_file_or_directory;
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}
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std::error_code
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OverlayFileSystem::getRealPath(const Twine &Path,
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SmallVectorImpl<char> &Output) const {
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for (const auto &FS : FSList)
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if (FS->exists(Path))
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return FS->getRealPath(Path, Output);
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return errc::no_such_file_or_directory;
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}
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void OverlayFileSystem::printImpl(raw_ostream &OS, PrintType Type,
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unsigned IndentLevel) const {
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printIndent(OS, IndentLevel);
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OS << "OverlayFileSystem\n";
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if (Type == PrintType::Summary)
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return;
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if (Type == PrintType::Contents)
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Type = PrintType::Summary;
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for (auto FS : overlays_range())
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FS->print(OS, Type, IndentLevel + 1);
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}
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llvm::vfs::detail::DirIterImpl::~DirIterImpl() = default;
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namespace {
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|
|
/// Combines and deduplicates directory entries across multiple file systems.
|
|
class CombiningDirIterImpl : public llvm::vfs::detail::DirIterImpl {
|
|
using FileSystemPtr = llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem>;
|
|
|
|
/// Iterators to combine, processed in reverse order.
|
|
SmallVector<directory_iterator, 8> IterList;
|
|
/// The iterator currently being traversed.
|
|
directory_iterator CurrentDirIter;
|
|
/// The set of names already returned as entries.
|
|
llvm::StringSet<> SeenNames;
|
|
|
|
/// Sets \c CurrentDirIter to the next iterator in the list, or leaves it as
|
|
/// is (at its end position) if we've already gone through them all.
|
|
std::error_code incrementIter(bool IsFirstTime) {
|
|
while (!IterList.empty()) {
|
|
CurrentDirIter = IterList.back();
|
|
IterList.pop_back();
|
|
if (CurrentDirIter != directory_iterator())
|
|
break; // found
|
|
}
|
|
|
|
if (IsFirstTime && CurrentDirIter == directory_iterator())
|
|
return errc::no_such_file_or_directory;
|
|
return {};
|
|
}
|
|
|
|
std::error_code incrementDirIter(bool IsFirstTime) {
|
|
assert((IsFirstTime || CurrentDirIter != directory_iterator()) &&
|
|
"incrementing past end");
|
|
std::error_code EC;
|
|
if (!IsFirstTime)
|
|
CurrentDirIter.increment(EC);
|
|
if (!EC && CurrentDirIter == directory_iterator())
|
|
EC = incrementIter(IsFirstTime);
|
|
return EC;
|
|
}
|
|
|
|
std::error_code incrementImpl(bool IsFirstTime) {
|
|
while (true) {
|
|
std::error_code EC = incrementDirIter(IsFirstTime);
|
|
if (EC || CurrentDirIter == directory_iterator()) {
|
|
CurrentEntry = directory_entry();
|
|
return EC;
|
|
}
|
|
CurrentEntry = *CurrentDirIter;
|
|
StringRef Name = llvm::sys::path::filename(CurrentEntry.path());
|
|
if (SeenNames.insert(Name).second)
|
|
return EC; // name not seen before
|
|
}
|
|
llvm_unreachable("returned above");
|
|
}
|
|
|
|
public:
|
|
CombiningDirIterImpl(ArrayRef<FileSystemPtr> FileSystems, std::string Dir,
|
|
std::error_code &EC) {
|
|
for (auto FS : FileSystems) {
|
|
std::error_code FEC;
|
|
directory_iterator Iter = FS->dir_begin(Dir, FEC);
|
|
if (FEC && FEC != errc::no_such_file_or_directory) {
|
|
EC = FEC;
|
|
return;
|
|
}
|
|
if (!FEC)
|
|
IterList.push_back(Iter);
|
|
}
|
|
EC = incrementImpl(true);
|
|
}
|
|
|
|
CombiningDirIterImpl(ArrayRef<directory_iterator> DirIters,
|
|
std::error_code &EC)
|
|
: IterList(DirIters.begin(), DirIters.end()) {
|
|
EC = incrementImpl(true);
|
|
}
|
|
|
|
std::error_code increment() override { return incrementImpl(false); }
|
|
};
|
|
|
|
} // namespace
|
|
|
|
directory_iterator OverlayFileSystem::dir_begin(const Twine &Dir,
|
|
std::error_code &EC) {
|
|
directory_iterator Combined = directory_iterator(
|
|
std::make_shared<CombiningDirIterImpl>(FSList, Dir.str(), EC));
|
|
if (EC)
|
|
return {};
|
|
return Combined;
|
|
}
|
|
|
|
void ProxyFileSystem::anchor() {}
|
|
|
|
namespace llvm {
|
|
namespace vfs {
|
|
|
|
namespace detail {
|
|
|
|
enum InMemoryNodeKind {
|
|
IME_File,
|
|
IME_Directory,
|
|
IME_HardLink,
|
|
IME_SymbolicLink,
|
|
};
|
|
|
|
/// The in memory file system is a tree of Nodes. Every node can either be a
|
|
/// file, symlink, hardlink or a directory.
|
|
class InMemoryNode {
|
|
InMemoryNodeKind Kind;
|
|
std::string FileName;
|
|
|
|
public:
|
|
InMemoryNode(llvm::StringRef FileName, InMemoryNodeKind Kind)
|
|
: Kind(Kind), FileName(std::string(llvm::sys::path::filename(FileName))) {
|
|
}
|
|
virtual ~InMemoryNode() = default;
|
|
|
|
/// Return the \p Status for this node. \p RequestedName should be the name
|
|
/// through which the caller referred to this node. It will override
|
|
/// \p Status::Name in the return value, to mimic the behavior of \p RealFile.
|
|
virtual Status getStatus(const Twine &RequestedName) const = 0;
|
|
|
|
/// Get the filename of this node (the name without the directory part).
|
|
StringRef getFileName() const { return FileName; }
|
|
InMemoryNodeKind getKind() const { return Kind; }
|
|
virtual std::string toString(unsigned Indent) const = 0;
|
|
};
|
|
|
|
class InMemoryFile : public InMemoryNode {
|
|
Status Stat;
|
|
std::unique_ptr<llvm::MemoryBuffer> Buffer;
|
|
|
|
public:
|
|
InMemoryFile(Status Stat, std::unique_ptr<llvm::MemoryBuffer> Buffer)
|
|
: InMemoryNode(Stat.getName(), IME_File), Stat(std::move(Stat)),
|
|
Buffer(std::move(Buffer)) {}
|
|
|
|
Status getStatus(const Twine &RequestedName) const override {
|
|
return Status::copyWithNewName(Stat, RequestedName);
|
|
}
|
|
llvm::MemoryBuffer *getBuffer() const { return Buffer.get(); }
|
|
|
|
std::string toString(unsigned Indent) const override {
|
|
return (std::string(Indent, ' ') + Stat.getName() + "\n").str();
|
|
}
|
|
|
|
static bool classof(const InMemoryNode *N) {
|
|
return N->getKind() == IME_File;
|
|
}
|
|
};
|
|
|
|
namespace {
|
|
|
|
class InMemoryHardLink : public InMemoryNode {
|
|
const InMemoryFile &ResolvedFile;
|
|
|
|
public:
|
|
InMemoryHardLink(StringRef Path, const InMemoryFile &ResolvedFile)
|
|
: InMemoryNode(Path, IME_HardLink), ResolvedFile(ResolvedFile) {}
|
|
const InMemoryFile &getResolvedFile() const { return ResolvedFile; }
|
|
|
|
Status getStatus(const Twine &RequestedName) const override {
|
|
return ResolvedFile.getStatus(RequestedName);
|
|
}
|
|
|
|
std::string toString(unsigned Indent) const override {
|
|
return std::string(Indent, ' ') + "HardLink to -> " +
|
|
ResolvedFile.toString(0);
|
|
}
|
|
|
|
static bool classof(const InMemoryNode *N) {
|
|
return N->getKind() == IME_HardLink;
|
|
}
|
|
};
|
|
|
|
class InMemorySymbolicLink : public InMemoryNode {
|
|
std::string TargetPath;
|
|
Status Stat;
|
|
|
|
public:
|
|
InMemorySymbolicLink(StringRef Path, StringRef TargetPath, Status Stat)
|
|
: InMemoryNode(Path, IME_SymbolicLink), TargetPath(std::move(TargetPath)),
|
|
Stat(Stat) {}
|
|
|
|
std::string toString(unsigned Indent) const override {
|
|
return std::string(Indent, ' ') + "SymbolicLink to -> " + TargetPath;
|
|
}
|
|
|
|
Status getStatus(const Twine &RequestedName) const override {
|
|
return Status::copyWithNewName(Stat, RequestedName);
|
|
}
|
|
|
|
StringRef getTargetPath() const { return TargetPath; }
|
|
|
|
static bool classof(const InMemoryNode *N) {
|
|
return N->getKind() == IME_SymbolicLink;
|
|
}
|
|
};
|
|
|
|
/// Adapt a InMemoryFile for VFS' File interface. The goal is to make
|
|
/// \p InMemoryFileAdaptor mimic as much as possible the behavior of
|
|
/// \p RealFile.
|
|
class InMemoryFileAdaptor : public File {
|
|
const InMemoryFile &Node;
|
|
/// The name to use when returning a Status for this file.
|
|
std::string RequestedName;
|
|
|
|
public:
|
|
explicit InMemoryFileAdaptor(const InMemoryFile &Node,
|
|
std::string RequestedName)
|
|
: Node(Node), RequestedName(std::move(RequestedName)) {}
|
|
|
|
llvm::ErrorOr<Status> status() override {
|
|
return Node.getStatus(RequestedName);
|
|
}
|
|
|
|
llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>>
|
|
getBuffer(const Twine &Name, int64_t FileSize, bool RequiresNullTerminator,
|
|
bool IsVolatile) override {
|
|
llvm::MemoryBuffer *Buf = Node.getBuffer();
|
|
return llvm::MemoryBuffer::getMemBuffer(
|
|
Buf->getBuffer(), Buf->getBufferIdentifier(), RequiresNullTerminator);
|
|
}
|
|
|
|
std::error_code close() override { return {}; }
|
|
|
|
void setPath(const Twine &Path) override { RequestedName = Path.str(); }
|
|
};
|
|
} // namespace
|
|
|
|
class InMemoryDirectory : public InMemoryNode {
|
|
Status Stat;
|
|
llvm::StringMap<std::unique_ptr<InMemoryNode>> Entries;
|
|
|
|
public:
|
|
InMemoryDirectory(Status Stat)
|
|
: InMemoryNode(Stat.getName(), IME_Directory), Stat(std::move(Stat)) {}
|
|
|
|
/// Return the \p Status for this node. \p RequestedName should be the name
|
|
/// through which the caller referred to this node. It will override
|
|
/// \p Status::Name in the return value, to mimic the behavior of \p RealFile.
|
|
Status getStatus(const Twine &RequestedName) const override {
|
|
return Status::copyWithNewName(Stat, RequestedName);
|
|
}
|
|
|
|
UniqueID getUniqueID() const { return Stat.getUniqueID(); }
|
|
|
|
InMemoryNode *getChild(StringRef Name) const {
|
|
auto I = Entries.find(Name);
|
|
if (I != Entries.end())
|
|
return I->second.get();
|
|
return nullptr;
|
|
}
|
|
|
|
InMemoryNode *addChild(StringRef Name, std::unique_ptr<InMemoryNode> Child) {
|
|
return Entries.insert(make_pair(Name, std::move(Child)))
|
|
.first->second.get();
|
|
}
|
|
|
|
using const_iterator = decltype(Entries)::const_iterator;
|
|
|
|
const_iterator begin() const { return Entries.begin(); }
|
|
const_iterator end() const { return Entries.end(); }
|
|
|
|
std::string toString(unsigned Indent) const override {
|
|
std::string Result =
|
|
(std::string(Indent, ' ') + Stat.getName() + "\n").str();
|
|
for (const auto &Entry : Entries)
|
|
Result += Entry.second->toString(Indent + 2);
|
|
return Result;
|
|
}
|
|
|
|
static bool classof(const InMemoryNode *N) {
|
|
return N->getKind() == IME_Directory;
|
|
}
|
|
};
|
|
|
|
} // namespace detail
|
|
|
|
// The UniqueID of in-memory files is derived from path and content.
|
|
// This avoids difficulties in creating exactly equivalent in-memory FSes,
|
|
// as often needed in multithreaded programs.
|
|
static sys::fs::UniqueID getUniqueID(hash_code Hash) {
|
|
return sys::fs::UniqueID(std::numeric_limits<uint64_t>::max(),
|
|
uint64_t(size_t(Hash)));
|
|
}
|
|
static sys::fs::UniqueID getFileID(sys::fs::UniqueID Parent,
|
|
llvm::StringRef Name,
|
|
llvm::StringRef Contents) {
|
|
return getUniqueID(llvm::hash_combine(Parent.getFile(), Name, Contents));
|
|
}
|
|
static sys::fs::UniqueID getDirectoryID(sys::fs::UniqueID Parent,
|
|
llvm::StringRef Name) {
|
|
return getUniqueID(llvm::hash_combine(Parent.getFile(), Name));
|
|
}
|
|
|
|
Status detail::NewInMemoryNodeInfo::makeStatus() const {
|
|
UniqueID UID =
|
|
(Type == sys::fs::file_type::directory_file)
|
|
? getDirectoryID(DirUID, Name)
|
|
: getFileID(DirUID, Name, Buffer ? Buffer->getBuffer() : "");
|
|
|
|
return Status(Path, UID, llvm::sys::toTimePoint(ModificationTime), User,
|
|
Group, Buffer ? Buffer->getBufferSize() : 0, Type, Perms);
|
|
}
|
|
|
|
InMemoryFileSystem::InMemoryFileSystem(bool UseNormalizedPaths)
|
|
: Root(new detail::InMemoryDirectory(
|
|
Status("", getDirectoryID(llvm::sys::fs::UniqueID(), ""),
|
|
llvm::sys::TimePoint<>(), 0, 0, 0,
|
|
llvm::sys::fs::file_type::directory_file,
|
|
llvm::sys::fs::perms::all_all))),
|
|
UseNormalizedPaths(UseNormalizedPaths) {}
|
|
|
|
InMemoryFileSystem::~InMemoryFileSystem() = default;
|
|
|
|
std::string InMemoryFileSystem::toString() const {
|
|
return Root->toString(/*Indent=*/0);
|
|
}
|
|
|
|
bool InMemoryFileSystem::addFile(const Twine &P, time_t ModificationTime,
|
|
std::unique_ptr<llvm::MemoryBuffer> Buffer,
|
|
std::optional<uint32_t> User,
|
|
std::optional<uint32_t> Group,
|
|
std::optional<llvm::sys::fs::file_type> Type,
|
|
std::optional<llvm::sys::fs::perms> Perms,
|
|
MakeNodeFn MakeNode) {
|
|
SmallString<128> Path;
|
|
P.toVector(Path);
|
|
|
|
// Fix up relative paths. This just prepends the current working directory.
|
|
std::error_code EC = makeAbsolute(Path);
|
|
assert(!EC);
|
|
(void)EC;
|
|
|
|
if (useNormalizedPaths())
|
|
llvm::sys::path::remove_dots(Path, /*remove_dot_dot=*/true);
|
|
|
|
if (Path.empty())
|
|
return false;
|
|
|
|
detail::InMemoryDirectory *Dir = Root.get();
|
|
auto I = llvm::sys::path::begin(Path), E = sys::path::end(Path);
|
|
const auto ResolvedUser = User.value_or(0);
|
|
const auto ResolvedGroup = Group.value_or(0);
|
|
const auto ResolvedType = Type.value_or(sys::fs::file_type::regular_file);
|
|
const auto ResolvedPerms = Perms.value_or(sys::fs::all_all);
|
|
// Any intermediate directories we create should be accessible by
|
|
// the owner, even if Perms says otherwise for the final path.
|
|
const auto NewDirectoryPerms = ResolvedPerms | sys::fs::owner_all;
|
|
while (true) {
|
|
StringRef Name = *I;
|
|
detail::InMemoryNode *Node = Dir->getChild(Name);
|
|
++I;
|
|
if (!Node) {
|
|
if (I == E) {
|
|
// End of the path.
|
|
Dir->addChild(
|
|
Name, MakeNode({Dir->getUniqueID(), Path, Name, ModificationTime,
|
|
std::move(Buffer), ResolvedUser, ResolvedGroup,
|
|
ResolvedType, ResolvedPerms}));
|
|
return true;
|
|
}
|
|
|
|
// Create a new directory. Use the path up to here.
|
|
Status Stat(
|
|
StringRef(Path.str().begin(), Name.end() - Path.str().begin()),
|
|
getDirectoryID(Dir->getUniqueID(), Name),
|
|
llvm::sys::toTimePoint(ModificationTime), ResolvedUser, ResolvedGroup,
|
|
0, sys::fs::file_type::directory_file, NewDirectoryPerms);
|
|
Dir = cast<detail::InMemoryDirectory>(Dir->addChild(
|
|
Name, std::make_unique<detail::InMemoryDirectory>(std::move(Stat))));
|
|
continue;
|
|
}
|
|
|
|
if (auto *NewDir = dyn_cast<detail::InMemoryDirectory>(Node)) {
|
|
Dir = NewDir;
|
|
} else {
|
|
assert((isa<detail::InMemoryFile>(Node) ||
|
|
isa<detail::InMemoryHardLink>(Node)) &&
|
|
"Must be either file, hardlink or directory!");
|
|
|
|
// Trying to insert a directory in place of a file.
|
|
if (I != E)
|
|
return false;
|
|
|
|
// Return false only if the new file is different from the existing one.
|
|
if (auto Link = dyn_cast<detail::InMemoryHardLink>(Node)) {
|
|
return Link->getResolvedFile().getBuffer()->getBuffer() ==
|
|
Buffer->getBuffer();
|
|
}
|
|
return cast<detail::InMemoryFile>(Node)->getBuffer()->getBuffer() ==
|
|
Buffer->getBuffer();
|
|
}
|
|
}
|
|
}
|
|
|
|
bool InMemoryFileSystem::addFile(const Twine &P, time_t ModificationTime,
|
|
std::unique_ptr<llvm::MemoryBuffer> Buffer,
|
|
std::optional<uint32_t> User,
|
|
std::optional<uint32_t> Group,
|
|
std::optional<llvm::sys::fs::file_type> Type,
|
|
std::optional<llvm::sys::fs::perms> Perms) {
|
|
return addFile(P, ModificationTime, std::move(Buffer), User, Group, Type,
|
|
Perms,
|
|
[](detail::NewInMemoryNodeInfo NNI)
|
|
-> std::unique_ptr<detail::InMemoryNode> {
|
|
Status Stat = NNI.makeStatus();
|
|
if (Stat.getType() == sys::fs::file_type::directory_file)
|
|
return std::make_unique<detail::InMemoryDirectory>(Stat);
|
|
return std::make_unique<detail::InMemoryFile>(
|
|
Stat, std::move(NNI.Buffer));
|
|
});
|
|
}
|
|
|
|
bool InMemoryFileSystem::addFileNoOwn(
|
|
const Twine &P, time_t ModificationTime,
|
|
const llvm::MemoryBufferRef &Buffer, std::optional<uint32_t> User,
|
|
std::optional<uint32_t> Group, std::optional<llvm::sys::fs::file_type> Type,
|
|
std::optional<llvm::sys::fs::perms> Perms) {
|
|
return addFile(P, ModificationTime, llvm::MemoryBuffer::getMemBuffer(Buffer),
|
|
std::move(User), std::move(Group), std::move(Type),
|
|
std::move(Perms),
|
|
[](detail::NewInMemoryNodeInfo NNI)
|
|
-> std::unique_ptr<detail::InMemoryNode> {
|
|
Status Stat = NNI.makeStatus();
|
|
if (Stat.getType() == sys::fs::file_type::directory_file)
|
|
return std::make_unique<detail::InMemoryDirectory>(Stat);
|
|
return std::make_unique<detail::InMemoryFile>(
|
|
Stat, std::move(NNI.Buffer));
|
|
});
|
|
}
|
|
|
|
detail::NamedNodeOrError
|
|
InMemoryFileSystem::lookupNode(const Twine &P, bool FollowFinalSymlink,
|
|
size_t SymlinkDepth) const {
|
|
SmallString<128> Path;
|
|
P.toVector(Path);
|
|
|
|
// Fix up relative paths. This just prepends the current working directory.
|
|
std::error_code EC = makeAbsolute(Path);
|
|
assert(!EC);
|
|
(void)EC;
|
|
|
|
if (useNormalizedPaths())
|
|
llvm::sys::path::remove_dots(Path, /*remove_dot_dot=*/true);
|
|
|
|
const detail::InMemoryDirectory *Dir = Root.get();
|
|
if (Path.empty())
|
|
return detail::NamedNodeOrError(Path, Dir);
|
|
|
|
auto I = llvm::sys::path::begin(Path), E = llvm::sys::path::end(Path);
|
|
while (true) {
|
|
detail::InMemoryNode *Node = Dir->getChild(*I);
|
|
++I;
|
|
if (!Node)
|
|
return errc::no_such_file_or_directory;
|
|
|
|
if (auto Symlink = dyn_cast<detail::InMemorySymbolicLink>(Node)) {
|
|
// If we're at the end of the path, and we're not following through
|
|
// terminal symlinks, then we're done.
|
|
if (I == E && !FollowFinalSymlink)
|
|
return detail::NamedNodeOrError(Path, Symlink);
|
|
|
|
if (SymlinkDepth > InMemoryFileSystem::MaxSymlinkDepth)
|
|
return errc::no_such_file_or_directory;
|
|
|
|
SmallString<128> TargetPath = Symlink->getTargetPath();
|
|
if (std::error_code EC = makeAbsolute(TargetPath))
|
|
return EC;
|
|
|
|
// Keep going with the target. We always want to follow symlinks here
|
|
// because we're either at the end of a path that we want to follow, or
|
|
// not at the end of a path, in which case we need to follow the symlink
|
|
// regardless.
|
|
auto Target =
|
|
lookupNode(TargetPath, /*FollowFinalSymlink=*/true, SymlinkDepth + 1);
|
|
if (!Target || I == E)
|
|
return Target;
|
|
|
|
if (!isa<detail::InMemoryDirectory>(*Target))
|
|
return errc::no_such_file_or_directory;
|
|
|
|
// Otherwise, continue on the search in the symlinked directory.
|
|
Dir = cast<detail::InMemoryDirectory>(*Target);
|
|
continue;
|
|
}
|
|
|
|
// Return the file if it's at the end of the path.
|
|
if (auto File = dyn_cast<detail::InMemoryFile>(Node)) {
|
|
if (I == E)
|
|
return detail::NamedNodeOrError(Path, File);
|
|
return errc::no_such_file_or_directory;
|
|
}
|
|
|
|
// If Node is HardLink then return the resolved file.
|
|
if (auto File = dyn_cast<detail::InMemoryHardLink>(Node)) {
|
|
if (I == E)
|
|
return detail::NamedNodeOrError(Path, &File->getResolvedFile());
|
|
return errc::no_such_file_or_directory;
|
|
}
|
|
// Traverse directories.
|
|
Dir = cast<detail::InMemoryDirectory>(Node);
|
|
if (I == E)
|
|
return detail::NamedNodeOrError(Path, Dir);
|
|
}
|
|
}
|
|
|
|
bool InMemoryFileSystem::addHardLink(const Twine &NewLink,
|
|
const Twine &Target) {
|
|
auto NewLinkNode = lookupNode(NewLink, /*FollowFinalSymlink=*/false);
|
|
// Whether symlinks in the hardlink target are followed is
|
|
// implementation-defined in POSIX.
|
|
// We're following symlinks here to be consistent with macOS.
|
|
auto TargetNode = lookupNode(Target, /*FollowFinalSymlink=*/true);
|
|
// FromPath must not have been added before. ToPath must have been added
|
|
// before. Resolved ToPath must be a File.
|
|
if (!TargetNode || NewLinkNode || !isa<detail::InMemoryFile>(*TargetNode))
|
|
return false;
|
|
return addFile(NewLink, 0, nullptr, std::nullopt, std::nullopt, std::nullopt,
|
|
std::nullopt, [&](detail::NewInMemoryNodeInfo NNI) {
|
|
return std::make_unique<detail::InMemoryHardLink>(
|
|
NNI.Path.str(),
|
|
*cast<detail::InMemoryFile>(*TargetNode));
|
|
});
|
|
}
|
|
|
|
bool InMemoryFileSystem::addSymbolicLink(
|
|
const Twine &NewLink, const Twine &Target, time_t ModificationTime,
|
|
std::optional<uint32_t> User, std::optional<uint32_t> Group,
|
|
std::optional<llvm::sys::fs::perms> Perms) {
|
|
auto NewLinkNode = lookupNode(NewLink, /*FollowFinalSymlink=*/false);
|
|
if (NewLinkNode)
|
|
return false;
|
|
|
|
SmallString<128> NewLinkStr, TargetStr;
|
|
NewLink.toVector(NewLinkStr);
|
|
Target.toVector(TargetStr);
|
|
|
|
return addFile(NewLinkStr, ModificationTime, nullptr, User, Group,
|
|
sys::fs::file_type::symlink_file, Perms,
|
|
[&](detail::NewInMemoryNodeInfo NNI) {
|
|
return std::make_unique<detail::InMemorySymbolicLink>(
|
|
NewLinkStr, TargetStr, NNI.makeStatus());
|
|
});
|
|
}
|
|
|
|
llvm::ErrorOr<Status> InMemoryFileSystem::status(const Twine &Path) {
|
|
auto Node = lookupNode(Path, /*FollowFinalSymlink=*/true);
|
|
if (Node)
|
|
return (*Node)->getStatus(Path);
|
|
return Node.getError();
|
|
}
|
|
|
|
llvm::ErrorOr<std::unique_ptr<File>>
|
|
InMemoryFileSystem::openFileForRead(const Twine &Path) {
|
|
auto Node = lookupNode(Path,/*FollowFinalSymlink=*/true);
|
|
if (!Node)
|
|
return Node.getError();
|
|
|
|
// When we have a file provide a heap-allocated wrapper for the memory buffer
|
|
// to match the ownership semantics for File.
|
|
if (auto *F = dyn_cast<detail::InMemoryFile>(*Node))
|
|
return std::unique_ptr<File>(
|
|
new detail::InMemoryFileAdaptor(*F, Path.str()));
|
|
|
|
// FIXME: errc::not_a_file?
|
|
return make_error_code(llvm::errc::invalid_argument);
|
|
}
|
|
|
|
/// Adaptor from InMemoryDir::iterator to directory_iterator.
|
|
class InMemoryFileSystem::DirIterator : public llvm::vfs::detail::DirIterImpl {
|
|
const InMemoryFileSystem *FS;
|
|
detail::InMemoryDirectory::const_iterator I;
|
|
detail::InMemoryDirectory::const_iterator E;
|
|
std::string RequestedDirName;
|
|
|
|
void setCurrentEntry() {
|
|
if (I != E) {
|
|
SmallString<256> Path(RequestedDirName);
|
|
llvm::sys::path::append(Path, I->second->getFileName());
|
|
sys::fs::file_type Type = sys::fs::file_type::type_unknown;
|
|
switch (I->second->getKind()) {
|
|
case detail::IME_File:
|
|
case detail::IME_HardLink:
|
|
Type = sys::fs::file_type::regular_file;
|
|
break;
|
|
case detail::IME_Directory:
|
|
Type = sys::fs::file_type::directory_file;
|
|
break;
|
|
case detail::IME_SymbolicLink:
|
|
if (auto SymlinkTarget =
|
|
FS->lookupNode(Path, /*FollowFinalSymlink=*/true)) {
|
|
Path = SymlinkTarget.getName();
|
|
Type = (*SymlinkTarget)->getStatus(Path).getType();
|
|
}
|
|
break;
|
|
}
|
|
CurrentEntry = directory_entry(std::string(Path.str()), Type);
|
|
} else {
|
|
// When we're at the end, make CurrentEntry invalid and DirIterImpl will
|
|
// do the rest.
|
|
CurrentEntry = directory_entry();
|
|
}
|
|
}
|
|
|
|
public:
|
|
DirIterator() = default;
|
|
|
|
DirIterator(const InMemoryFileSystem *FS,
|
|
const detail::InMemoryDirectory &Dir,
|
|
std::string RequestedDirName)
|
|
: FS(FS), I(Dir.begin()), E(Dir.end()),
|
|
RequestedDirName(std::move(RequestedDirName)) {
|
|
setCurrentEntry();
|
|
}
|
|
|
|
std::error_code increment() override {
|
|
++I;
|
|
setCurrentEntry();
|
|
return {};
|
|
}
|
|
};
|
|
|
|
directory_iterator InMemoryFileSystem::dir_begin(const Twine &Dir,
|
|
std::error_code &EC) {
|
|
auto Node = lookupNode(Dir, /*FollowFinalSymlink=*/true);
|
|
if (!Node) {
|
|
EC = Node.getError();
|
|
return directory_iterator(std::make_shared<DirIterator>());
|
|
}
|
|
|
|
if (auto *DirNode = dyn_cast<detail::InMemoryDirectory>(*Node))
|
|
return directory_iterator(
|
|
std::make_shared<DirIterator>(this, *DirNode, Dir.str()));
|
|
|
|
EC = make_error_code(llvm::errc::not_a_directory);
|
|
return directory_iterator(std::make_shared<DirIterator>());
|
|
}
|
|
|
|
std::error_code InMemoryFileSystem::setCurrentWorkingDirectory(const Twine &P) {
|
|
SmallString<128> Path;
|
|
P.toVector(Path);
|
|
|
|
// Fix up relative paths. This just prepends the current working directory.
|
|
std::error_code EC = makeAbsolute(Path);
|
|
assert(!EC);
|
|
(void)EC;
|
|
|
|
if (useNormalizedPaths())
|
|
llvm::sys::path::remove_dots(Path, /*remove_dot_dot=*/true);
|
|
|
|
if (!Path.empty())
|
|
WorkingDirectory = std::string(Path.str());
|
|
return {};
|
|
}
|
|
|
|
std::error_code
|
|
InMemoryFileSystem::getRealPath(const Twine &Path,
|
|
SmallVectorImpl<char> &Output) const {
|
|
auto CWD = getCurrentWorkingDirectory();
|
|
if (!CWD || CWD->empty())
|
|
return errc::operation_not_permitted;
|
|
Path.toVector(Output);
|
|
if (auto EC = makeAbsolute(Output))
|
|
return EC;
|
|
llvm::sys::path::remove_dots(Output, /*remove_dot_dot=*/true);
|
|
return {};
|
|
}
|
|
|
|
std::error_code InMemoryFileSystem::isLocal(const Twine &Path, bool &Result) {
|
|
Result = false;
|
|
return {};
|
|
}
|
|
|
|
void InMemoryFileSystem::printImpl(raw_ostream &OS, PrintType PrintContents,
|
|
unsigned IndentLevel) const {
|
|
printIndent(OS, IndentLevel);
|
|
OS << "InMemoryFileSystem\n";
|
|
}
|
|
|
|
} // namespace vfs
|
|
} // namespace llvm
|
|
|
|
//===-----------------------------------------------------------------------===/
|
|
// RedirectingFileSystem implementation
|
|
//===-----------------------------------------------------------------------===/
|
|
|
|
namespace {
|
|
|
|
static llvm::sys::path::Style getExistingStyle(llvm::StringRef Path) {
|
|
// Detect the path style in use by checking the first separator.
|
|
llvm::sys::path::Style style = llvm::sys::path::Style::native;
|
|
const size_t n = Path.find_first_of("/\\");
|
|
// Can't distinguish between posix and windows_slash here.
|
|
if (n != static_cast<size_t>(-1))
|
|
style = (Path[n] == '/') ? llvm::sys::path::Style::posix
|
|
: llvm::sys::path::Style::windows_backslash;
|
|
return style;
|
|
}
|
|
|
|
/// Removes leading "./" as well as path components like ".." and ".".
|
|
static llvm::SmallString<256> canonicalize(llvm::StringRef Path) {
|
|
// First detect the path style in use by checking the first separator.
|
|
llvm::sys::path::Style style = getExistingStyle(Path);
|
|
|
|
// Now remove the dots. Explicitly specifying the path style prevents the
|
|
// direction of the slashes from changing.
|
|
llvm::SmallString<256> result =
|
|
llvm::sys::path::remove_leading_dotslash(Path, style);
|
|
llvm::sys::path::remove_dots(result, /*remove_dot_dot=*/true, style);
|
|
return result;
|
|
}
|
|
|
|
/// Whether the error and entry specify a file/directory that was not found.
|
|
static bool isFileNotFound(std::error_code EC,
|
|
RedirectingFileSystem::Entry *E = nullptr) {
|
|
if (E && !isa<RedirectingFileSystem::DirectoryRemapEntry>(E))
|
|
return false;
|
|
return EC == llvm::errc::no_such_file_or_directory;
|
|
}
|
|
|
|
} // anonymous namespace
|
|
|
|
|
|
RedirectingFileSystem::RedirectingFileSystem(IntrusiveRefCntPtr<FileSystem> FS)
|
|
: ExternalFS(std::move(FS)) {
|
|
if (ExternalFS)
|
|
if (auto ExternalWorkingDirectory =
|
|
ExternalFS->getCurrentWorkingDirectory()) {
|
|
WorkingDirectory = *ExternalWorkingDirectory;
|
|
}
|
|
}
|
|
|
|
/// Directory iterator implementation for \c RedirectingFileSystem's
|
|
/// directory entries.
|
|
class llvm::vfs::RedirectingFSDirIterImpl
|
|
: public llvm::vfs::detail::DirIterImpl {
|
|
std::string Dir;
|
|
RedirectingFileSystem::DirectoryEntry::iterator Current, End;
|
|
|
|
std::error_code incrementImpl(bool IsFirstTime) {
|
|
assert((IsFirstTime || Current != End) && "cannot iterate past end");
|
|
if (!IsFirstTime)
|
|
++Current;
|
|
if (Current != End) {
|
|
SmallString<128> PathStr(Dir);
|
|
llvm::sys::path::append(PathStr, (*Current)->getName());
|
|
sys::fs::file_type Type = sys::fs::file_type::type_unknown;
|
|
switch ((*Current)->getKind()) {
|
|
case RedirectingFileSystem::EK_Directory:
|
|
[[fallthrough]];
|
|
case RedirectingFileSystem::EK_DirectoryRemap:
|
|
Type = sys::fs::file_type::directory_file;
|
|
break;
|
|
case RedirectingFileSystem::EK_File:
|
|
Type = sys::fs::file_type::regular_file;
|
|
break;
|
|
}
|
|
CurrentEntry = directory_entry(std::string(PathStr.str()), Type);
|
|
} else {
|
|
CurrentEntry = directory_entry();
|
|
}
|
|
return {};
|
|
};
|
|
|
|
public:
|
|
RedirectingFSDirIterImpl(
|
|
const Twine &Path, RedirectingFileSystem::DirectoryEntry::iterator Begin,
|
|
RedirectingFileSystem::DirectoryEntry::iterator End, std::error_code &EC)
|
|
: Dir(Path.str()), Current(Begin), End(End) {
|
|
EC = incrementImpl(/*IsFirstTime=*/true);
|
|
}
|
|
|
|
std::error_code increment() override {
|
|
return incrementImpl(/*IsFirstTime=*/false);
|
|
}
|
|
};
|
|
|
|
namespace {
|
|
/// Directory iterator implementation for \c RedirectingFileSystem's
|
|
/// directory remap entries that maps the paths reported by the external
|
|
/// file system's directory iterator back to the virtual directory's path.
|
|
class RedirectingFSDirRemapIterImpl : public llvm::vfs::detail::DirIterImpl {
|
|
std::string Dir;
|
|
llvm::sys::path::Style DirStyle;
|
|
llvm::vfs::directory_iterator ExternalIter;
|
|
|
|
public:
|
|
RedirectingFSDirRemapIterImpl(std::string DirPath,
|
|
llvm::vfs::directory_iterator ExtIter)
|
|
: Dir(std::move(DirPath)), DirStyle(getExistingStyle(Dir)),
|
|
ExternalIter(ExtIter) {
|
|
if (ExternalIter != llvm::vfs::directory_iterator())
|
|
setCurrentEntry();
|
|
}
|
|
|
|
void setCurrentEntry() {
|
|
StringRef ExternalPath = ExternalIter->path();
|
|
llvm::sys::path::Style ExternalStyle = getExistingStyle(ExternalPath);
|
|
StringRef File = llvm::sys::path::filename(ExternalPath, ExternalStyle);
|
|
|
|
SmallString<128> NewPath(Dir);
|
|
llvm::sys::path::append(NewPath, DirStyle, File);
|
|
|
|
CurrentEntry = directory_entry(std::string(NewPath), ExternalIter->type());
|
|
}
|
|
|
|
std::error_code increment() override {
|
|
std::error_code EC;
|
|
ExternalIter.increment(EC);
|
|
if (!EC && ExternalIter != llvm::vfs::directory_iterator())
|
|
setCurrentEntry();
|
|
else
|
|
CurrentEntry = directory_entry();
|
|
return EC;
|
|
}
|
|
};
|
|
} // namespace
|
|
|
|
llvm::ErrorOr<std::string>
|
|
RedirectingFileSystem::getCurrentWorkingDirectory() const {
|
|
return WorkingDirectory;
|
|
}
|
|
|
|
std::error_code
|
|
RedirectingFileSystem::setCurrentWorkingDirectory(const Twine &Path) {
|
|
// Don't change the working directory if the path doesn't exist.
|
|
if (!exists(Path))
|
|
return errc::no_such_file_or_directory;
|
|
|
|
SmallString<128> AbsolutePath;
|
|
Path.toVector(AbsolutePath);
|
|
if (std::error_code EC = makeAbsolute(AbsolutePath))
|
|
return EC;
|
|
WorkingDirectory = std::string(AbsolutePath.str());
|
|
return {};
|
|
}
|
|
|
|
std::error_code RedirectingFileSystem::isLocal(const Twine &Path_,
|
|
bool &Result) {
|
|
SmallString<256> Path;
|
|
Path_.toVector(Path);
|
|
|
|
if (std::error_code EC = makeCanonical(Path))
|
|
return {};
|
|
|
|
return ExternalFS->isLocal(Path, Result);
|
|
}
|
|
|
|
std::error_code RedirectingFileSystem::makeAbsolute(SmallVectorImpl<char> &Path) const {
|
|
// is_absolute(..., Style::windows_*) accepts paths with both slash types.
|
|
if (llvm::sys::path::is_absolute(Path, llvm::sys::path::Style::posix) ||
|
|
llvm::sys::path::is_absolute(Path,
|
|
llvm::sys::path::Style::windows_backslash))
|
|
// This covers windows absolute path with forward slash as well, as the
|
|
// forward slashes are treated as path seperation in llvm::path
|
|
// regardless of what path::Style is used.
|
|
return {};
|
|
|
|
auto WorkingDir = getCurrentWorkingDirectory();
|
|
if (!WorkingDir)
|
|
return WorkingDir.getError();
|
|
|
|
return makeAbsolute(WorkingDir.get(), Path);
|
|
}
|
|
|
|
std::error_code
|
|
RedirectingFileSystem::makeAbsolute(StringRef WorkingDir,
|
|
SmallVectorImpl<char> &Path) const {
|
|
// We can't use sys::fs::make_absolute because that assumes the path style
|
|
// is native and there is no way to override that. Since we know WorkingDir
|
|
// is absolute, we can use it to determine which style we actually have and
|
|
// append Path ourselves.
|
|
if (!WorkingDir.empty() &&
|
|
!sys::path::is_absolute(WorkingDir, sys::path::Style::posix) &&
|
|
!sys::path::is_absolute(WorkingDir,
|
|
sys::path::Style::windows_backslash)) {
|
|
return std::error_code();
|
|
}
|
|
sys::path::Style style = sys::path::Style::windows_backslash;
|
|
if (sys::path::is_absolute(WorkingDir, sys::path::Style::posix)) {
|
|
style = sys::path::Style::posix;
|
|
} else {
|
|
// Distinguish between windows_backslash and windows_slash; getExistingStyle
|
|
// returns posix for a path with windows_slash.
|
|
if (getExistingStyle(WorkingDir) != sys::path::Style::windows_backslash)
|
|
style = sys::path::Style::windows_slash;
|
|
}
|
|
|
|
std::string Result = std::string(WorkingDir);
|
|
StringRef Dir(Result);
|
|
if (!Dir.endswith(sys::path::get_separator(style))) {
|
|
Result += sys::path::get_separator(style);
|
|
}
|
|
// backslashes '\' are legit path charactors under POSIX. Windows APIs
|
|
// like CreateFile accepts forward slashes '/' as path
|
|
// separator (even when mixed with backslashes). Therefore,
|
|
// `Path` should be directly appended to `WorkingDir` without converting
|
|
// path separator.
|
|
Result.append(Path.data(), Path.size());
|
|
Path.assign(Result.begin(), Result.end());
|
|
|
|
return {};
|
|
}
|
|
|
|
directory_iterator RedirectingFileSystem::dir_begin(const Twine &Dir,
|
|
std::error_code &EC) {
|
|
SmallString<256> Path;
|
|
Dir.toVector(Path);
|
|
|
|
EC = makeCanonical(Path);
|
|
if (EC)
|
|
return {};
|
|
|
|
ErrorOr<RedirectingFileSystem::LookupResult> Result = lookupPath(Path);
|
|
if (!Result) {
|
|
if (Redirection != RedirectKind::RedirectOnly &&
|
|
isFileNotFound(Result.getError()))
|
|
return ExternalFS->dir_begin(Path, EC);
|
|
|
|
EC = Result.getError();
|
|
return {};
|
|
}
|
|
|
|
// Use status to make sure the path exists and refers to a directory.
|
|
ErrorOr<Status> S = status(Path, Dir, *Result);
|
|
if (!S) {
|
|
if (Redirection != RedirectKind::RedirectOnly &&
|
|
isFileNotFound(S.getError(), Result->E))
|
|
return ExternalFS->dir_begin(Dir, EC);
|
|
|
|
EC = S.getError();
|
|
return {};
|
|
}
|
|
|
|
if (!S->isDirectory()) {
|
|
EC = errc::not_a_directory;
|
|
return {};
|
|
}
|
|
|
|
// Create the appropriate directory iterator based on whether we found a
|
|
// DirectoryRemapEntry or DirectoryEntry.
|
|
directory_iterator RedirectIter;
|
|
std::error_code RedirectEC;
|
|
if (auto ExtRedirect = Result->getExternalRedirect()) {
|
|
auto RE = cast<RedirectingFileSystem::RemapEntry>(Result->E);
|
|
RedirectIter = ExternalFS->dir_begin(*ExtRedirect, RedirectEC);
|
|
|
|
if (!RE->useExternalName(UseExternalNames)) {
|
|
// Update the paths in the results to use the virtual directory's path.
|
|
RedirectIter =
|
|
directory_iterator(std::make_shared<RedirectingFSDirRemapIterImpl>(
|
|
std::string(Path), RedirectIter));
|
|
}
|
|
} else {
|
|
auto DE = cast<DirectoryEntry>(Result->E);
|
|
RedirectIter =
|
|
directory_iterator(std::make_shared<RedirectingFSDirIterImpl>(
|
|
Path, DE->contents_begin(), DE->contents_end(), RedirectEC));
|
|
}
|
|
|
|
if (RedirectEC) {
|
|
if (RedirectEC != errc::no_such_file_or_directory) {
|
|
EC = RedirectEC;
|
|
return {};
|
|
}
|
|
RedirectIter = {};
|
|
}
|
|
|
|
if (Redirection == RedirectKind::RedirectOnly) {
|
|
EC = RedirectEC;
|
|
return RedirectIter;
|
|
}
|
|
|
|
std::error_code ExternalEC;
|
|
directory_iterator ExternalIter = ExternalFS->dir_begin(Path, ExternalEC);
|
|
if (ExternalEC) {
|
|
if (ExternalEC != errc::no_such_file_or_directory) {
|
|
EC = ExternalEC;
|
|
return {};
|
|
}
|
|
ExternalIter = {};
|
|
}
|
|
|
|
SmallVector<directory_iterator, 2> Iters;
|
|
switch (Redirection) {
|
|
case RedirectKind::Fallthrough:
|
|
Iters.push_back(ExternalIter);
|
|
Iters.push_back(RedirectIter);
|
|
break;
|
|
case RedirectKind::Fallback:
|
|
Iters.push_back(RedirectIter);
|
|
Iters.push_back(ExternalIter);
|
|
break;
|
|
default:
|
|
llvm_unreachable("unhandled RedirectKind");
|
|
}
|
|
|
|
directory_iterator Combined{
|
|
std::make_shared<CombiningDirIterImpl>(Iters, EC)};
|
|
if (EC)
|
|
return {};
|
|
return Combined;
|
|
}
|
|
|
|
void RedirectingFileSystem::setOverlayFileDir(StringRef Dir) {
|
|
OverlayFileDir = Dir.str();
|
|
}
|
|
|
|
StringRef RedirectingFileSystem::getOverlayFileDir() const {
|
|
return OverlayFileDir;
|
|
}
|
|
|
|
void RedirectingFileSystem::setFallthrough(bool Fallthrough) {
|
|
if (Fallthrough) {
|
|
Redirection = RedirectingFileSystem::RedirectKind::Fallthrough;
|
|
} else {
|
|
Redirection = RedirectingFileSystem::RedirectKind::RedirectOnly;
|
|
}
|
|
}
|
|
|
|
void RedirectingFileSystem::setRedirection(
|
|
RedirectingFileSystem::RedirectKind Kind) {
|
|
Redirection = Kind;
|
|
}
|
|
|
|
std::vector<StringRef> RedirectingFileSystem::getRoots() const {
|
|
std::vector<StringRef> R;
|
|
R.reserve(Roots.size());
|
|
for (const auto &Root : Roots)
|
|
R.push_back(Root->getName());
|
|
return R;
|
|
}
|
|
|
|
void RedirectingFileSystem::printImpl(raw_ostream &OS, PrintType Type,
|
|
unsigned IndentLevel) const {
|
|
printIndent(OS, IndentLevel);
|
|
OS << "RedirectingFileSystem (UseExternalNames: "
|
|
<< (UseExternalNames ? "true" : "false") << ")\n";
|
|
if (Type == PrintType::Summary)
|
|
return;
|
|
|
|
for (const auto &Root : Roots)
|
|
printEntry(OS, Root.get(), IndentLevel);
|
|
|
|
printIndent(OS, IndentLevel);
|
|
OS << "ExternalFS:\n";
|
|
ExternalFS->print(OS, Type == PrintType::Contents ? PrintType::Summary : Type,
|
|
IndentLevel + 1);
|
|
}
|
|
|
|
void RedirectingFileSystem::printEntry(raw_ostream &OS,
|
|
RedirectingFileSystem::Entry *E,
|
|
unsigned IndentLevel) const {
|
|
printIndent(OS, IndentLevel);
|
|
OS << "'" << E->getName() << "'";
|
|
|
|
switch (E->getKind()) {
|
|
case EK_Directory: {
|
|
auto *DE = cast<RedirectingFileSystem::DirectoryEntry>(E);
|
|
|
|
OS << "\n";
|
|
for (std::unique_ptr<Entry> &SubEntry :
|
|
llvm::make_range(DE->contents_begin(), DE->contents_end()))
|
|
printEntry(OS, SubEntry.get(), IndentLevel + 1);
|
|
break;
|
|
}
|
|
case EK_DirectoryRemap:
|
|
case EK_File: {
|
|
auto *RE = cast<RedirectingFileSystem::RemapEntry>(E);
|
|
OS << " -> '" << RE->getExternalContentsPath() << "'";
|
|
switch (RE->getUseName()) {
|
|
case NK_NotSet:
|
|
break;
|
|
case NK_External:
|
|
OS << " (UseExternalName: true)";
|
|
break;
|
|
case NK_Virtual:
|
|
OS << " (UseExternalName: false)";
|
|
break;
|
|
}
|
|
OS << "\n";
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/// A helper class to hold the common YAML parsing state.
|
|
class llvm::vfs::RedirectingFileSystemParser {
|
|
yaml::Stream &Stream;
|
|
|
|
void error(yaml::Node *N, const Twine &Msg) { Stream.printError(N, Msg); }
|
|
|
|
// false on error
|
|
bool parseScalarString(yaml::Node *N, StringRef &Result,
|
|
SmallVectorImpl<char> &Storage) {
|
|
const auto *S = dyn_cast<yaml::ScalarNode>(N);
|
|
|
|
if (!S) {
|
|
error(N, "expected string");
|
|
return false;
|
|
}
|
|
Result = S->getValue(Storage);
|
|
return true;
|
|
}
|
|
|
|
// false on error
|
|
bool parseScalarBool(yaml::Node *N, bool &Result) {
|
|
SmallString<5> Storage;
|
|
StringRef Value;
|
|
if (!parseScalarString(N, Value, Storage))
|
|
return false;
|
|
|
|
if (Value.equals_insensitive("true") || Value.equals_insensitive("on") ||
|
|
Value.equals_insensitive("yes") || Value == "1") {
|
|
Result = true;
|
|
return true;
|
|
} else if (Value.equals_insensitive("false") ||
|
|
Value.equals_insensitive("off") ||
|
|
Value.equals_insensitive("no") || Value == "0") {
|
|
Result = false;
|
|
return true;
|
|
}
|
|
|
|
error(N, "expected boolean value");
|
|
return false;
|
|
}
|
|
|
|
std::optional<RedirectingFileSystem::RedirectKind>
|
|
parseRedirectKind(yaml::Node *N) {
|
|
SmallString<12> Storage;
|
|
StringRef Value;
|
|
if (!parseScalarString(N, Value, Storage))
|
|
return std::nullopt;
|
|
|
|
if (Value.equals_insensitive("fallthrough")) {
|
|
return RedirectingFileSystem::RedirectKind::Fallthrough;
|
|
} else if (Value.equals_insensitive("fallback")) {
|
|
return RedirectingFileSystem::RedirectKind::Fallback;
|
|
} else if (Value.equals_insensitive("redirect-only")) {
|
|
return RedirectingFileSystem::RedirectKind::RedirectOnly;
|
|
}
|
|
return std::nullopt;
|
|
}
|
|
|
|
std::optional<RedirectingFileSystem::RootRelativeKind>
|
|
parseRootRelativeKind(yaml::Node *N) {
|
|
SmallString<12> Storage;
|
|
StringRef Value;
|
|
if (!parseScalarString(N, Value, Storage))
|
|
return std::nullopt;
|
|
if (Value.equals_insensitive("cwd")) {
|
|
return RedirectingFileSystem::RootRelativeKind::CWD;
|
|
} else if (Value.equals_insensitive("overlay-dir")) {
|
|
return RedirectingFileSystem::RootRelativeKind::OverlayDir;
|
|
}
|
|
return std::nullopt;
|
|
}
|
|
|
|
struct KeyStatus {
|
|
bool Required;
|
|
bool Seen = false;
|
|
|
|
KeyStatus(bool Required = false) : Required(Required) {}
|
|
};
|
|
|
|
using KeyStatusPair = std::pair<StringRef, KeyStatus>;
|
|
|
|
// false on error
|
|
bool checkDuplicateOrUnknownKey(yaml::Node *KeyNode, StringRef Key,
|
|
DenseMap<StringRef, KeyStatus> &Keys) {
|
|
if (!Keys.count(Key)) {
|
|
error(KeyNode, "unknown key");
|
|
return false;
|
|
}
|
|
KeyStatus &S = Keys[Key];
|
|
if (S.Seen) {
|
|
error(KeyNode, Twine("duplicate key '") + Key + "'");
|
|
return false;
|
|
}
|
|
S.Seen = true;
|
|
return true;
|
|
}
|
|
|
|
// false on error
|
|
bool checkMissingKeys(yaml::Node *Obj, DenseMap<StringRef, KeyStatus> &Keys) {
|
|
for (const auto &I : Keys) {
|
|
if (I.second.Required && !I.second.Seen) {
|
|
error(Obj, Twine("missing key '") + I.first + "'");
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
public:
|
|
static RedirectingFileSystem::Entry *
|
|
lookupOrCreateEntry(RedirectingFileSystem *FS, StringRef Name,
|
|
RedirectingFileSystem::Entry *ParentEntry = nullptr) {
|
|
if (!ParentEntry) { // Look for a existent root
|
|
for (const auto &Root : FS->Roots) {
|
|
if (Name.equals(Root->getName())) {
|
|
ParentEntry = Root.get();
|
|
return ParentEntry;
|
|
}
|
|
}
|
|
} else { // Advance to the next component
|
|
auto *DE = dyn_cast<RedirectingFileSystem::DirectoryEntry>(ParentEntry);
|
|
for (std::unique_ptr<RedirectingFileSystem::Entry> &Content :
|
|
llvm::make_range(DE->contents_begin(), DE->contents_end())) {
|
|
auto *DirContent =
|
|
dyn_cast<RedirectingFileSystem::DirectoryEntry>(Content.get());
|
|
if (DirContent && Name.equals(Content->getName()))
|
|
return DirContent;
|
|
}
|
|
}
|
|
|
|
// ... or create a new one
|
|
std::unique_ptr<RedirectingFileSystem::Entry> E =
|
|
std::make_unique<RedirectingFileSystem::DirectoryEntry>(
|
|
Name, Status("", getNextVirtualUniqueID(),
|
|
std::chrono::system_clock::now(), 0, 0, 0,
|
|
file_type::directory_file, sys::fs::all_all));
|
|
|
|
if (!ParentEntry) { // Add a new root to the overlay
|
|
FS->Roots.push_back(std::move(E));
|
|
ParentEntry = FS->Roots.back().get();
|
|
return ParentEntry;
|
|
}
|
|
|
|
auto *DE = cast<RedirectingFileSystem::DirectoryEntry>(ParentEntry);
|
|
DE->addContent(std::move(E));
|
|
return DE->getLastContent();
|
|
}
|
|
|
|
private:
|
|
void uniqueOverlayTree(RedirectingFileSystem *FS,
|
|
RedirectingFileSystem::Entry *SrcE,
|
|
RedirectingFileSystem::Entry *NewParentE = nullptr) {
|
|
StringRef Name = SrcE->getName();
|
|
switch (SrcE->getKind()) {
|
|
case RedirectingFileSystem::EK_Directory: {
|
|
auto *DE = cast<RedirectingFileSystem::DirectoryEntry>(SrcE);
|
|
// Empty directories could be present in the YAML as a way to
|
|
// describe a file for a current directory after some of its subdir
|
|
// is parsed. This only leads to redundant walks, ignore it.
|
|
if (!Name.empty())
|
|
NewParentE = lookupOrCreateEntry(FS, Name, NewParentE);
|
|
for (std::unique_ptr<RedirectingFileSystem::Entry> &SubEntry :
|
|
llvm::make_range(DE->contents_begin(), DE->contents_end()))
|
|
uniqueOverlayTree(FS, SubEntry.get(), NewParentE);
|
|
break;
|
|
}
|
|
case RedirectingFileSystem::EK_DirectoryRemap: {
|
|
assert(NewParentE && "Parent entry must exist");
|
|
auto *DR = cast<RedirectingFileSystem::DirectoryRemapEntry>(SrcE);
|
|
auto *DE = cast<RedirectingFileSystem::DirectoryEntry>(NewParentE);
|
|
DE->addContent(
|
|
std::make_unique<RedirectingFileSystem::DirectoryRemapEntry>(
|
|
Name, DR->getExternalContentsPath(), DR->getUseName()));
|
|
break;
|
|
}
|
|
case RedirectingFileSystem::EK_File: {
|
|
assert(NewParentE && "Parent entry must exist");
|
|
auto *FE = cast<RedirectingFileSystem::FileEntry>(SrcE);
|
|
auto *DE = cast<RedirectingFileSystem::DirectoryEntry>(NewParentE);
|
|
DE->addContent(std::make_unique<RedirectingFileSystem::FileEntry>(
|
|
Name, FE->getExternalContentsPath(), FE->getUseName()));
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
std::unique_ptr<RedirectingFileSystem::Entry>
|
|
parseEntry(yaml::Node *N, RedirectingFileSystem *FS, bool IsRootEntry) {
|
|
auto *M = dyn_cast<yaml::MappingNode>(N);
|
|
if (!M) {
|
|
error(N, "expected mapping node for file or directory entry");
|
|
return nullptr;
|
|
}
|
|
|
|
KeyStatusPair Fields[] = {
|
|
KeyStatusPair("name", true),
|
|
KeyStatusPair("type", true),
|
|
KeyStatusPair("contents", false),
|
|
KeyStatusPair("external-contents", false),
|
|
KeyStatusPair("use-external-name", false),
|
|
};
|
|
|
|
DenseMap<StringRef, KeyStatus> Keys(std::begin(Fields), std::end(Fields));
|
|
|
|
enum { CF_NotSet, CF_List, CF_External } ContentsField = CF_NotSet;
|
|
std::vector<std::unique_ptr<RedirectingFileSystem::Entry>>
|
|
EntryArrayContents;
|
|
SmallString<256> ExternalContentsPath;
|
|
SmallString<256> Name;
|
|
yaml::Node *NameValueNode = nullptr;
|
|
auto UseExternalName = RedirectingFileSystem::NK_NotSet;
|
|
RedirectingFileSystem::EntryKind Kind;
|
|
|
|
for (auto &I : *M) {
|
|
StringRef Key;
|
|
// Reuse the buffer for key and value, since we don't look at key after
|
|
// parsing value.
|
|
SmallString<256> Buffer;
|
|
if (!parseScalarString(I.getKey(), Key, Buffer))
|
|
return nullptr;
|
|
|
|
if (!checkDuplicateOrUnknownKey(I.getKey(), Key, Keys))
|
|
return nullptr;
|
|
|
|
StringRef Value;
|
|
if (Key == "name") {
|
|
if (!parseScalarString(I.getValue(), Value, Buffer))
|
|
return nullptr;
|
|
|
|
NameValueNode = I.getValue();
|
|
// Guarantee that old YAML files containing paths with ".." and "."
|
|
// are properly canonicalized before read into the VFS.
|
|
Name = canonicalize(Value).str();
|
|
} else if (Key == "type") {
|
|
if (!parseScalarString(I.getValue(), Value, Buffer))
|
|
return nullptr;
|
|
if (Value == "file")
|
|
Kind = RedirectingFileSystem::EK_File;
|
|
else if (Value == "directory")
|
|
Kind = RedirectingFileSystem::EK_Directory;
|
|
else if (Value == "directory-remap")
|
|
Kind = RedirectingFileSystem::EK_DirectoryRemap;
|
|
else {
|
|
error(I.getValue(), "unknown value for 'type'");
|
|
return nullptr;
|
|
}
|
|
} else if (Key == "contents") {
|
|
if (ContentsField != CF_NotSet) {
|
|
error(I.getKey(),
|
|
"entry already has 'contents' or 'external-contents'");
|
|
return nullptr;
|
|
}
|
|
ContentsField = CF_List;
|
|
auto *Contents = dyn_cast<yaml::SequenceNode>(I.getValue());
|
|
if (!Contents) {
|
|
// FIXME: this is only for directories, what about files?
|
|
error(I.getValue(), "expected array");
|
|
return nullptr;
|
|
}
|
|
|
|
for (auto &I : *Contents) {
|
|
if (std::unique_ptr<RedirectingFileSystem::Entry> E =
|
|
parseEntry(&I, FS, /*IsRootEntry*/ false))
|
|
EntryArrayContents.push_back(std::move(E));
|
|
else
|
|
return nullptr;
|
|
}
|
|
} else if (Key == "external-contents") {
|
|
if (ContentsField != CF_NotSet) {
|
|
error(I.getKey(),
|
|
"entry already has 'contents' or 'external-contents'");
|
|
return nullptr;
|
|
}
|
|
ContentsField = CF_External;
|
|
if (!parseScalarString(I.getValue(), Value, Buffer))
|
|
return nullptr;
|
|
|
|
SmallString<256> FullPath;
|
|
if (FS->IsRelativeOverlay) {
|
|
FullPath = FS->getOverlayFileDir();
|
|
assert(!FullPath.empty() &&
|
|
"External contents prefix directory must exist");
|
|
llvm::sys::path::append(FullPath, Value);
|
|
} else {
|
|
FullPath = Value;
|
|
}
|
|
|
|
// Guarantee that old YAML files containing paths with ".." and "."
|
|
// are properly canonicalized before read into the VFS.
|
|
FullPath = canonicalize(FullPath);
|
|
ExternalContentsPath = FullPath.str();
|
|
} else if (Key == "use-external-name") {
|
|
bool Val;
|
|
if (!parseScalarBool(I.getValue(), Val))
|
|
return nullptr;
|
|
UseExternalName = Val ? RedirectingFileSystem::NK_External
|
|
: RedirectingFileSystem::NK_Virtual;
|
|
} else {
|
|
llvm_unreachable("key missing from Keys");
|
|
}
|
|
}
|
|
|
|
if (Stream.failed())
|
|
return nullptr;
|
|
|
|
// check for missing keys
|
|
if (ContentsField == CF_NotSet) {
|
|
error(N, "missing key 'contents' or 'external-contents'");
|
|
return nullptr;
|
|
}
|
|
if (!checkMissingKeys(N, Keys))
|
|
return nullptr;
|
|
|
|
// check invalid configuration
|
|
if (Kind == RedirectingFileSystem::EK_Directory &&
|
|
UseExternalName != RedirectingFileSystem::NK_NotSet) {
|
|
error(N, "'use-external-name' is not supported for 'directory' entries");
|
|
return nullptr;
|
|
}
|
|
|
|
if (Kind == RedirectingFileSystem::EK_DirectoryRemap &&
|
|
ContentsField == CF_List) {
|
|
error(N, "'contents' is not supported for 'directory-remap' entries");
|
|
return nullptr;
|
|
}
|
|
|
|
sys::path::Style path_style = sys::path::Style::native;
|
|
if (IsRootEntry) {
|
|
// VFS root entries may be in either Posix or Windows style. Figure out
|
|
// which style we have, and use it consistently.
|
|
if (sys::path::is_absolute(Name, sys::path::Style::posix)) {
|
|
path_style = sys::path::Style::posix;
|
|
} else if (sys::path::is_absolute(Name,
|
|
sys::path::Style::windows_backslash)) {
|
|
path_style = sys::path::Style::windows_backslash;
|
|
} else {
|
|
// Relative VFS root entries are made absolute to either the overlay
|
|
// directory, or the current working directory, then we can determine
|
|
// the path style from that.
|
|
std::error_code EC;
|
|
if (FS->RootRelative ==
|
|
RedirectingFileSystem::RootRelativeKind::OverlayDir) {
|
|
StringRef FullPath = FS->getOverlayFileDir();
|
|
assert(!FullPath.empty() && "Overlay file directory must exist");
|
|
EC = FS->makeAbsolute(FullPath, Name);
|
|
Name = canonicalize(Name);
|
|
} else {
|
|
EC = sys::fs::make_absolute(Name);
|
|
}
|
|
if (EC) {
|
|
assert(NameValueNode && "Name presence should be checked earlier");
|
|
error(
|
|
NameValueNode,
|
|
"entry with relative path at the root level is not discoverable");
|
|
return nullptr;
|
|
}
|
|
path_style = sys::path::is_absolute(Name, sys::path::Style::posix)
|
|
? sys::path::Style::posix
|
|
: sys::path::Style::windows_backslash;
|
|
}
|
|
// is::path::is_absolute(Name, sys::path::Style::windows_backslash) will
|
|
// return true even if `Name` is using forward slashes. Distinguish
|
|
// between windows_backslash and windows_slash.
|
|
if (path_style == sys::path::Style::windows_backslash &&
|
|
getExistingStyle(Name) != sys::path::Style::windows_backslash)
|
|
path_style = sys::path::Style::windows_slash;
|
|
}
|
|
|
|
// Remove trailing slash(es), being careful not to remove the root path
|
|
StringRef Trimmed = Name;
|
|
size_t RootPathLen = sys::path::root_path(Trimmed, path_style).size();
|
|
while (Trimmed.size() > RootPathLen &&
|
|
sys::path::is_separator(Trimmed.back(), path_style))
|
|
Trimmed = Trimmed.slice(0, Trimmed.size() - 1);
|
|
|
|
// Get the last component
|
|
StringRef LastComponent = sys::path::filename(Trimmed, path_style);
|
|
|
|
std::unique_ptr<RedirectingFileSystem::Entry> Result;
|
|
switch (Kind) {
|
|
case RedirectingFileSystem::EK_File:
|
|
Result = std::make_unique<RedirectingFileSystem::FileEntry>(
|
|
LastComponent, std::move(ExternalContentsPath), UseExternalName);
|
|
break;
|
|
case RedirectingFileSystem::EK_DirectoryRemap:
|
|
Result = std::make_unique<RedirectingFileSystem::DirectoryRemapEntry>(
|
|
LastComponent, std::move(ExternalContentsPath), UseExternalName);
|
|
break;
|
|
case RedirectingFileSystem::EK_Directory:
|
|
Result = std::make_unique<RedirectingFileSystem::DirectoryEntry>(
|
|
LastComponent, std::move(EntryArrayContents),
|
|
Status("", getNextVirtualUniqueID(), std::chrono::system_clock::now(),
|
|
0, 0, 0, file_type::directory_file, sys::fs::all_all));
|
|
break;
|
|
}
|
|
|
|
StringRef Parent = sys::path::parent_path(Trimmed, path_style);
|
|
if (Parent.empty())
|
|
return Result;
|
|
|
|
// if 'name' contains multiple components, create implicit directory entries
|
|
for (sys::path::reverse_iterator I = sys::path::rbegin(Parent, path_style),
|
|
E = sys::path::rend(Parent);
|
|
I != E; ++I) {
|
|
std::vector<std::unique_ptr<RedirectingFileSystem::Entry>> Entries;
|
|
Entries.push_back(std::move(Result));
|
|
Result = std::make_unique<RedirectingFileSystem::DirectoryEntry>(
|
|
*I, std::move(Entries),
|
|
Status("", getNextVirtualUniqueID(), std::chrono::system_clock::now(),
|
|
0, 0, 0, file_type::directory_file, sys::fs::all_all));
|
|
}
|
|
return Result;
|
|
}
|
|
|
|
public:
|
|
RedirectingFileSystemParser(yaml::Stream &S) : Stream(S) {}
|
|
|
|
// false on error
|
|
bool parse(yaml::Node *Root, RedirectingFileSystem *FS) {
|
|
auto *Top = dyn_cast<yaml::MappingNode>(Root);
|
|
if (!Top) {
|
|
error(Root, "expected mapping node");
|
|
return false;
|
|
}
|
|
|
|
KeyStatusPair Fields[] = {
|
|
KeyStatusPair("version", true),
|
|
KeyStatusPair("case-sensitive", false),
|
|
KeyStatusPair("use-external-names", false),
|
|
KeyStatusPair("root-relative", false),
|
|
KeyStatusPair("overlay-relative", false),
|
|
KeyStatusPair("fallthrough", false),
|
|
KeyStatusPair("redirecting-with", false),
|
|
KeyStatusPair("roots", true),
|
|
};
|
|
|
|
DenseMap<StringRef, KeyStatus> Keys(std::begin(Fields), std::end(Fields));
|
|
std::vector<std::unique_ptr<RedirectingFileSystem::Entry>> RootEntries;
|
|
|
|
// Parse configuration and 'roots'
|
|
for (auto &I : *Top) {
|
|
SmallString<10> KeyBuffer;
|
|
StringRef Key;
|
|
if (!parseScalarString(I.getKey(), Key, KeyBuffer))
|
|
return false;
|
|
|
|
if (!checkDuplicateOrUnknownKey(I.getKey(), Key, Keys))
|
|
return false;
|
|
|
|
if (Key == "roots") {
|
|
auto *Roots = dyn_cast<yaml::SequenceNode>(I.getValue());
|
|
if (!Roots) {
|
|
error(I.getValue(), "expected array");
|
|
return false;
|
|
}
|
|
|
|
for (auto &I : *Roots) {
|
|
if (std::unique_ptr<RedirectingFileSystem::Entry> E =
|
|
parseEntry(&I, FS, /*IsRootEntry*/ true))
|
|
RootEntries.push_back(std::move(E));
|
|
else
|
|
return false;
|
|
}
|
|
} else if (Key == "version") {
|
|
StringRef VersionString;
|
|
SmallString<4> Storage;
|
|
if (!parseScalarString(I.getValue(), VersionString, Storage))
|
|
return false;
|
|
int Version;
|
|
if (VersionString.getAsInteger<int>(10, Version)) {
|
|
error(I.getValue(), "expected integer");
|
|
return false;
|
|
}
|
|
if (Version < 0) {
|
|
error(I.getValue(), "invalid version number");
|
|
return false;
|
|
}
|
|
if (Version != 0) {
|
|
error(I.getValue(), "version mismatch, expected 0");
|
|
return false;
|
|
}
|
|
} else if (Key == "case-sensitive") {
|
|
if (!parseScalarBool(I.getValue(), FS->CaseSensitive))
|
|
return false;
|
|
} else if (Key == "overlay-relative") {
|
|
if (!parseScalarBool(I.getValue(), FS->IsRelativeOverlay))
|
|
return false;
|
|
} else if (Key == "use-external-names") {
|
|
if (!parseScalarBool(I.getValue(), FS->UseExternalNames))
|
|
return false;
|
|
} else if (Key == "fallthrough") {
|
|
if (Keys["redirecting-with"].Seen) {
|
|
error(I.getValue(),
|
|
"'fallthrough' and 'redirecting-with' are mutually exclusive");
|
|
return false;
|
|
}
|
|
|
|
bool ShouldFallthrough = false;
|
|
if (!parseScalarBool(I.getValue(), ShouldFallthrough))
|
|
return false;
|
|
|
|
if (ShouldFallthrough) {
|
|
FS->Redirection = RedirectingFileSystem::RedirectKind::Fallthrough;
|
|
} else {
|
|
FS->Redirection = RedirectingFileSystem::RedirectKind::RedirectOnly;
|
|
}
|
|
} else if (Key == "redirecting-with") {
|
|
if (Keys["fallthrough"].Seen) {
|
|
error(I.getValue(),
|
|
"'fallthrough' and 'redirecting-with' are mutually exclusive");
|
|
return false;
|
|
}
|
|
|
|
if (auto Kind = parseRedirectKind(I.getValue())) {
|
|
FS->Redirection = *Kind;
|
|
} else {
|
|
error(I.getValue(), "expected valid redirect kind");
|
|
return false;
|
|
}
|
|
} else if (Key == "root-relative") {
|
|
if (auto Kind = parseRootRelativeKind(I.getValue())) {
|
|
FS->RootRelative = *Kind;
|
|
} else {
|
|
error(I.getValue(), "expected valid root-relative kind");
|
|
return false;
|
|
}
|
|
} else {
|
|
llvm_unreachable("key missing from Keys");
|
|
}
|
|
}
|
|
|
|
if (Stream.failed())
|
|
return false;
|
|
|
|
if (!checkMissingKeys(Top, Keys))
|
|
return false;
|
|
|
|
// Now that we sucessefully parsed the YAML file, canonicalize the internal
|
|
// representation to a proper directory tree so that we can search faster
|
|
// inside the VFS.
|
|
for (auto &E : RootEntries)
|
|
uniqueOverlayTree(FS, E.get());
|
|
|
|
return true;
|
|
}
|
|
};
|
|
|
|
std::unique_ptr<RedirectingFileSystem>
|
|
RedirectingFileSystem::create(std::unique_ptr<MemoryBuffer> Buffer,
|
|
SourceMgr::DiagHandlerTy DiagHandler,
|
|
StringRef YAMLFilePath, void *DiagContext,
|
|
IntrusiveRefCntPtr<FileSystem> ExternalFS) {
|
|
SourceMgr SM;
|
|
yaml::Stream Stream(Buffer->getMemBufferRef(), SM);
|
|
|
|
SM.setDiagHandler(DiagHandler, DiagContext);
|
|
yaml::document_iterator DI = Stream.begin();
|
|
yaml::Node *Root = DI->getRoot();
|
|
if (DI == Stream.end() || !Root) {
|
|
SM.PrintMessage(SMLoc(), SourceMgr::DK_Error, "expected root node");
|
|
return nullptr;
|
|
}
|
|
|
|
RedirectingFileSystemParser P(Stream);
|
|
|
|
std::unique_ptr<RedirectingFileSystem> FS(
|
|
new RedirectingFileSystem(ExternalFS));
|
|
|
|
if (!YAMLFilePath.empty()) {
|
|
// Use the YAML path from -ivfsoverlay to compute the dir to be prefixed
|
|
// to each 'external-contents' path.
|
|
//
|
|
// Example:
|
|
// -ivfsoverlay dummy.cache/vfs/vfs.yaml
|
|
// yields:
|
|
// FS->OverlayFileDir => /<absolute_path_to>/dummy.cache/vfs
|
|
//
|
|
SmallString<256> OverlayAbsDir = sys::path::parent_path(YAMLFilePath);
|
|
std::error_code EC = llvm::sys::fs::make_absolute(OverlayAbsDir);
|
|
assert(!EC && "Overlay dir final path must be absolute");
|
|
(void)EC;
|
|
FS->setOverlayFileDir(OverlayAbsDir);
|
|
}
|
|
|
|
if (!P.parse(Root, FS.get()))
|
|
return nullptr;
|
|
|
|
return FS;
|
|
}
|
|
|
|
std::unique_ptr<RedirectingFileSystem> RedirectingFileSystem::create(
|
|
ArrayRef<std::pair<std::string, std::string>> RemappedFiles,
|
|
bool UseExternalNames, FileSystem &ExternalFS) {
|
|
std::unique_ptr<RedirectingFileSystem> FS(
|
|
new RedirectingFileSystem(&ExternalFS));
|
|
FS->UseExternalNames = UseExternalNames;
|
|
|
|
StringMap<RedirectingFileSystem::Entry *> Entries;
|
|
|
|
for (auto &Mapping : llvm::reverse(RemappedFiles)) {
|
|
SmallString<128> From = StringRef(Mapping.first);
|
|
SmallString<128> To = StringRef(Mapping.second);
|
|
{
|
|
auto EC = ExternalFS.makeAbsolute(From);
|
|
(void)EC;
|
|
assert(!EC && "Could not make absolute path");
|
|
}
|
|
|
|
// Check if we've already mapped this file. The first one we see (in the
|
|
// reverse iteration) wins.
|
|
RedirectingFileSystem::Entry *&ToEntry = Entries[From];
|
|
if (ToEntry)
|
|
continue;
|
|
|
|
// Add parent directories.
|
|
RedirectingFileSystem::Entry *Parent = nullptr;
|
|
StringRef FromDirectory = llvm::sys::path::parent_path(From);
|
|
for (auto I = llvm::sys::path::begin(FromDirectory),
|
|
E = llvm::sys::path::end(FromDirectory);
|
|
I != E; ++I) {
|
|
Parent = RedirectingFileSystemParser::lookupOrCreateEntry(FS.get(), *I,
|
|
Parent);
|
|
}
|
|
assert(Parent && "File without a directory?");
|
|
{
|
|
auto EC = ExternalFS.makeAbsolute(To);
|
|
(void)EC;
|
|
assert(!EC && "Could not make absolute path");
|
|
}
|
|
|
|
// Add the file.
|
|
auto NewFile = std::make_unique<RedirectingFileSystem::FileEntry>(
|
|
llvm::sys::path::filename(From), To,
|
|
UseExternalNames ? RedirectingFileSystem::NK_External
|
|
: RedirectingFileSystem::NK_Virtual);
|
|
ToEntry = NewFile.get();
|
|
cast<RedirectingFileSystem::DirectoryEntry>(Parent)->addContent(
|
|
std::move(NewFile));
|
|
}
|
|
|
|
return FS;
|
|
}
|
|
|
|
RedirectingFileSystem::LookupResult::LookupResult(
|
|
Entry *E, sys::path::const_iterator Start, sys::path::const_iterator End)
|
|
: E(E) {
|
|
assert(E != nullptr);
|
|
// If the matched entry is a DirectoryRemapEntry, set ExternalRedirect to the
|
|
// path of the directory it maps to in the external file system plus any
|
|
// remaining path components in the provided iterator.
|
|
if (auto *DRE = dyn_cast<RedirectingFileSystem::DirectoryRemapEntry>(E)) {
|
|
SmallString<256> Redirect(DRE->getExternalContentsPath());
|
|
sys::path::append(Redirect, Start, End,
|
|
getExistingStyle(DRE->getExternalContentsPath()));
|
|
ExternalRedirect = std::string(Redirect);
|
|
}
|
|
}
|
|
|
|
std::error_code
|
|
RedirectingFileSystem::makeCanonical(SmallVectorImpl<char> &Path) const {
|
|
if (std::error_code EC = makeAbsolute(Path))
|
|
return EC;
|
|
|
|
llvm::SmallString<256> CanonicalPath =
|
|
canonicalize(StringRef(Path.data(), Path.size()));
|
|
if (CanonicalPath.empty())
|
|
return make_error_code(llvm::errc::invalid_argument);
|
|
|
|
Path.assign(CanonicalPath.begin(), CanonicalPath.end());
|
|
return {};
|
|
}
|
|
|
|
ErrorOr<RedirectingFileSystem::LookupResult>
|
|
RedirectingFileSystem::lookupPath(StringRef Path) const {
|
|
sys::path::const_iterator Start = sys::path::begin(Path);
|
|
sys::path::const_iterator End = sys::path::end(Path);
|
|
for (const auto &Root : Roots) {
|
|
ErrorOr<RedirectingFileSystem::LookupResult> Result =
|
|
lookupPathImpl(Start, End, Root.get());
|
|
if (Result || Result.getError() != llvm::errc::no_such_file_or_directory)
|
|
return Result;
|
|
}
|
|
return make_error_code(llvm::errc::no_such_file_or_directory);
|
|
}
|
|
|
|
ErrorOr<RedirectingFileSystem::LookupResult>
|
|
RedirectingFileSystem::lookupPathImpl(
|
|
sys::path::const_iterator Start, sys::path::const_iterator End,
|
|
RedirectingFileSystem::Entry *From) const {
|
|
assert(!isTraversalComponent(*Start) &&
|
|
!isTraversalComponent(From->getName()) &&
|
|
"Paths should not contain traversal components");
|
|
|
|
StringRef FromName = From->getName();
|
|
|
|
// Forward the search to the next component in case this is an empty one.
|
|
if (!FromName.empty()) {
|
|
if (!pathComponentMatches(*Start, FromName))
|
|
return make_error_code(llvm::errc::no_such_file_or_directory);
|
|
|
|
++Start;
|
|
|
|
if (Start == End) {
|
|
// Match!
|
|
return LookupResult(From, Start, End);
|
|
}
|
|
}
|
|
|
|
if (isa<RedirectingFileSystem::FileEntry>(From))
|
|
return make_error_code(llvm::errc::not_a_directory);
|
|
|
|
if (isa<RedirectingFileSystem::DirectoryRemapEntry>(From))
|
|
return LookupResult(From, Start, End);
|
|
|
|
auto *DE = cast<RedirectingFileSystem::DirectoryEntry>(From);
|
|
for (const std::unique_ptr<RedirectingFileSystem::Entry> &DirEntry :
|
|
llvm::make_range(DE->contents_begin(), DE->contents_end())) {
|
|
ErrorOr<RedirectingFileSystem::LookupResult> Result =
|
|
lookupPathImpl(Start, End, DirEntry.get());
|
|
if (Result || Result.getError() != llvm::errc::no_such_file_or_directory)
|
|
return Result;
|
|
}
|
|
|
|
return make_error_code(llvm::errc::no_such_file_or_directory);
|
|
}
|
|
|
|
static Status getRedirectedFileStatus(const Twine &OriginalPath,
|
|
bool UseExternalNames,
|
|
Status ExternalStatus) {
|
|
// The path has been mapped by some nested VFS and exposes an external path,
|
|
// don't override it with the original path.
|
|
if (ExternalStatus.ExposesExternalVFSPath)
|
|
return ExternalStatus;
|
|
|
|
Status S = ExternalStatus;
|
|
if (!UseExternalNames)
|
|
S = Status::copyWithNewName(S, OriginalPath);
|
|
else
|
|
S.ExposesExternalVFSPath = true;
|
|
S.IsVFSMapped = true;
|
|
return S;
|
|
}
|
|
|
|
ErrorOr<Status> RedirectingFileSystem::status(
|
|
const Twine &CanonicalPath, const Twine &OriginalPath,
|
|
const RedirectingFileSystem::LookupResult &Result) {
|
|
if (std::optional<StringRef> ExtRedirect = Result.getExternalRedirect()) {
|
|
SmallString<256> CanonicalRemappedPath((*ExtRedirect).str());
|
|
if (std::error_code EC = makeCanonical(CanonicalRemappedPath))
|
|
return EC;
|
|
|
|
ErrorOr<Status> S = ExternalFS->status(CanonicalRemappedPath);
|
|
if (!S)
|
|
return S;
|
|
S = Status::copyWithNewName(*S, *ExtRedirect);
|
|
auto *RE = cast<RedirectingFileSystem::RemapEntry>(Result.E);
|
|
return getRedirectedFileStatus(OriginalPath,
|
|
RE->useExternalName(UseExternalNames), *S);
|
|
}
|
|
|
|
auto *DE = cast<RedirectingFileSystem::DirectoryEntry>(Result.E);
|
|
return Status::copyWithNewName(DE->getStatus(), CanonicalPath);
|
|
}
|
|
|
|
ErrorOr<Status>
|
|
RedirectingFileSystem::getExternalStatus(const Twine &CanonicalPath,
|
|
const Twine &OriginalPath) const {
|
|
auto Result = ExternalFS->status(CanonicalPath);
|
|
|
|
// The path has been mapped by some nested VFS, don't override it with the
|
|
// original path.
|
|
if (!Result || Result->ExposesExternalVFSPath)
|
|
return Result;
|
|
return Status::copyWithNewName(Result.get(), OriginalPath);
|
|
}
|
|
|
|
ErrorOr<Status> RedirectingFileSystem::status(const Twine &OriginalPath) {
|
|
SmallString<256> CanonicalPath;
|
|
OriginalPath.toVector(CanonicalPath);
|
|
|
|
if (std::error_code EC = makeCanonical(CanonicalPath))
|
|
return EC;
|
|
|
|
if (Redirection == RedirectKind::Fallback) {
|
|
// Attempt to find the original file first, only falling back to the
|
|
// mapped file if that fails.
|
|
ErrorOr<Status> S = getExternalStatus(CanonicalPath, OriginalPath);
|
|
if (S)
|
|
return S;
|
|
}
|
|
|
|
ErrorOr<RedirectingFileSystem::LookupResult> Result =
|
|
lookupPath(CanonicalPath);
|
|
if (!Result) {
|
|
// Was not able to map file, fallthrough to using the original path if
|
|
// that was the specified redirection type.
|
|
if (Redirection == RedirectKind::Fallthrough &&
|
|
isFileNotFound(Result.getError()))
|
|
return getExternalStatus(CanonicalPath, OriginalPath);
|
|
return Result.getError();
|
|
}
|
|
|
|
ErrorOr<Status> S = status(CanonicalPath, OriginalPath, *Result);
|
|
if (!S && Redirection == RedirectKind::Fallthrough &&
|
|
isFileNotFound(S.getError(), Result->E)) {
|
|
// Mapped the file but it wasn't found in the underlying filesystem,
|
|
// fallthrough to using the original path if that was the specified
|
|
// redirection type.
|
|
return getExternalStatus(CanonicalPath, OriginalPath);
|
|
}
|
|
|
|
return S;
|
|
}
|
|
|
|
namespace {
|
|
|
|
/// Provide a file wrapper with an overriden status.
|
|
class FileWithFixedStatus : public File {
|
|
std::unique_ptr<File> InnerFile;
|
|
Status S;
|
|
|
|
public:
|
|
FileWithFixedStatus(std::unique_ptr<File> InnerFile, Status S)
|
|
: InnerFile(std::move(InnerFile)), S(std::move(S)) {}
|
|
|
|
ErrorOr<Status> status() override { return S; }
|
|
ErrorOr<std::unique_ptr<llvm::MemoryBuffer>>
|
|
|
|
getBuffer(const Twine &Name, int64_t FileSize, bool RequiresNullTerminator,
|
|
bool IsVolatile) override {
|
|
return InnerFile->getBuffer(Name, FileSize, RequiresNullTerminator,
|
|
IsVolatile);
|
|
}
|
|
|
|
std::error_code close() override { return InnerFile->close(); }
|
|
|
|
void setPath(const Twine &Path) override { S = S.copyWithNewName(S, Path); }
|
|
};
|
|
|
|
} // namespace
|
|
|
|
ErrorOr<std::unique_ptr<File>>
|
|
File::getWithPath(ErrorOr<std::unique_ptr<File>> Result, const Twine &P) {
|
|
// See \c getRedirectedFileStatus - don't update path if it's exposing an
|
|
// external path.
|
|
if (!Result || (*Result)->status()->ExposesExternalVFSPath)
|
|
return Result;
|
|
|
|
ErrorOr<std::unique_ptr<File>> F = std::move(*Result);
|
|
auto Name = F->get()->getName();
|
|
if (Name && Name.get() != P.str())
|
|
F->get()->setPath(P);
|
|
return F;
|
|
}
|
|
|
|
ErrorOr<std::unique_ptr<File>>
|
|
RedirectingFileSystem::openFileForRead(const Twine &OriginalPath) {
|
|
SmallString<256> CanonicalPath;
|
|
OriginalPath.toVector(CanonicalPath);
|
|
|
|
if (std::error_code EC = makeCanonical(CanonicalPath))
|
|
return EC;
|
|
|
|
if (Redirection == RedirectKind::Fallback) {
|
|
// Attempt to find the original file first, only falling back to the
|
|
// mapped file if that fails.
|
|
auto F = File::getWithPath(ExternalFS->openFileForRead(CanonicalPath),
|
|
OriginalPath);
|
|
if (F)
|
|
return F;
|
|
}
|
|
|
|
ErrorOr<RedirectingFileSystem::LookupResult> Result =
|
|
lookupPath(CanonicalPath);
|
|
if (!Result) {
|
|
// Was not able to map file, fallthrough to using the original path if
|
|
// that was the specified redirection type.
|
|
if (Redirection == RedirectKind::Fallthrough &&
|
|
isFileNotFound(Result.getError()))
|
|
return File::getWithPath(ExternalFS->openFileForRead(CanonicalPath),
|
|
OriginalPath);
|
|
return Result.getError();
|
|
}
|
|
|
|
if (!Result->getExternalRedirect()) // FIXME: errc::not_a_file?
|
|
return make_error_code(llvm::errc::invalid_argument);
|
|
|
|
StringRef ExtRedirect = *Result->getExternalRedirect();
|
|
SmallString<256> CanonicalRemappedPath(ExtRedirect.str());
|
|
if (std::error_code EC = makeCanonical(CanonicalRemappedPath))
|
|
return EC;
|
|
|
|
auto *RE = cast<RedirectingFileSystem::RemapEntry>(Result->E);
|
|
|
|
auto ExternalFile = File::getWithPath(
|
|
ExternalFS->openFileForRead(CanonicalRemappedPath), ExtRedirect);
|
|
if (!ExternalFile) {
|
|
if (Redirection == RedirectKind::Fallthrough &&
|
|
isFileNotFound(ExternalFile.getError(), Result->E)) {
|
|
// Mapped the file but it wasn't found in the underlying filesystem,
|
|
// fallthrough to using the original path if that was the specified
|
|
// redirection type.
|
|
return File::getWithPath(ExternalFS->openFileForRead(CanonicalPath),
|
|
OriginalPath);
|
|
}
|
|
return ExternalFile;
|
|
}
|
|
|
|
auto ExternalStatus = (*ExternalFile)->status();
|
|
if (!ExternalStatus)
|
|
return ExternalStatus.getError();
|
|
|
|
// Otherwise, the file was successfully remapped. Mark it as such. Also
|
|
// replace the underlying path if the external name is being used.
|
|
Status S = getRedirectedFileStatus(
|
|
OriginalPath, RE->useExternalName(UseExternalNames), *ExternalStatus);
|
|
return std::unique_ptr<File>(
|
|
std::make_unique<FileWithFixedStatus>(std::move(*ExternalFile), S));
|
|
}
|
|
|
|
std::error_code
|
|
RedirectingFileSystem::getRealPath(const Twine &OriginalPath,
|
|
SmallVectorImpl<char> &Output) const {
|
|
SmallString<256> CanonicalPath;
|
|
OriginalPath.toVector(CanonicalPath);
|
|
|
|
if (std::error_code EC = makeCanonical(CanonicalPath))
|
|
return EC;
|
|
|
|
if (Redirection == RedirectKind::Fallback) {
|
|
// Attempt to find the original file first, only falling back to the
|
|
// mapped file if that fails.
|
|
std::error_code EC = ExternalFS->getRealPath(CanonicalPath, Output);
|
|
if (!EC)
|
|
return EC;
|
|
}
|
|
|
|
ErrorOr<RedirectingFileSystem::LookupResult> Result =
|
|
lookupPath(CanonicalPath);
|
|
if (!Result) {
|
|
// Was not able to map file, fallthrough to using the original path if
|
|
// that was the specified redirection type.
|
|
if (Redirection == RedirectKind::Fallthrough &&
|
|
isFileNotFound(Result.getError()))
|
|
return ExternalFS->getRealPath(CanonicalPath, Output);
|
|
return Result.getError();
|
|
}
|
|
|
|
// If we found FileEntry or DirectoryRemapEntry, look up the mapped
|
|
// path in the external file system.
|
|
if (auto ExtRedirect = Result->getExternalRedirect()) {
|
|
auto P = ExternalFS->getRealPath(*ExtRedirect, Output);
|
|
if (P && Redirection == RedirectKind::Fallthrough &&
|
|
isFileNotFound(P, Result->E)) {
|
|
// Mapped the file but it wasn't found in the underlying filesystem,
|
|
// fallthrough to using the original path if that was the specified
|
|
// redirection type.
|
|
return ExternalFS->getRealPath(CanonicalPath, Output);
|
|
}
|
|
return P;
|
|
}
|
|
|
|
// If we found a DirectoryEntry, still fallthrough to the original path if
|
|
// allowed, because directories don't have a single external contents path.
|
|
if (Redirection == RedirectKind::Fallthrough)
|
|
return ExternalFS->getRealPath(CanonicalPath, Output);
|
|
return llvm::errc::invalid_argument;
|
|
}
|
|
|
|
std::unique_ptr<FileSystem>
|
|
vfs::getVFSFromYAML(std::unique_ptr<MemoryBuffer> Buffer,
|
|
SourceMgr::DiagHandlerTy DiagHandler,
|
|
StringRef YAMLFilePath, void *DiagContext,
|
|
IntrusiveRefCntPtr<FileSystem> ExternalFS) {
|
|
return RedirectingFileSystem::create(std::move(Buffer), DiagHandler,
|
|
YAMLFilePath, DiagContext,
|
|
std::move(ExternalFS));
|
|
}
|
|
|
|
static void getVFSEntries(RedirectingFileSystem::Entry *SrcE,
|
|
SmallVectorImpl<StringRef> &Path,
|
|
SmallVectorImpl<YAMLVFSEntry> &Entries) {
|
|
auto Kind = SrcE->getKind();
|
|
if (Kind == RedirectingFileSystem::EK_Directory) {
|
|
auto *DE = dyn_cast<RedirectingFileSystem::DirectoryEntry>(SrcE);
|
|
assert(DE && "Must be a directory");
|
|
for (std::unique_ptr<RedirectingFileSystem::Entry> &SubEntry :
|
|
llvm::make_range(DE->contents_begin(), DE->contents_end())) {
|
|
Path.push_back(SubEntry->getName());
|
|
getVFSEntries(SubEntry.get(), Path, Entries);
|
|
Path.pop_back();
|
|
}
|
|
return;
|
|
}
|
|
|
|
if (Kind == RedirectingFileSystem::EK_DirectoryRemap) {
|
|
auto *DR = dyn_cast<RedirectingFileSystem::DirectoryRemapEntry>(SrcE);
|
|
assert(DR && "Must be a directory remap");
|
|
SmallString<128> VPath;
|
|
for (auto &Comp : Path)
|
|
llvm::sys::path::append(VPath, Comp);
|
|
Entries.push_back(
|
|
YAMLVFSEntry(VPath.c_str(), DR->getExternalContentsPath()));
|
|
return;
|
|
}
|
|
|
|
assert(Kind == RedirectingFileSystem::EK_File && "Must be a EK_File");
|
|
auto *FE = dyn_cast<RedirectingFileSystem::FileEntry>(SrcE);
|
|
assert(FE && "Must be a file");
|
|
SmallString<128> VPath;
|
|
for (auto &Comp : Path)
|
|
llvm::sys::path::append(VPath, Comp);
|
|
Entries.push_back(YAMLVFSEntry(VPath.c_str(), FE->getExternalContentsPath()));
|
|
}
|
|
|
|
void vfs::collectVFSFromYAML(std::unique_ptr<MemoryBuffer> Buffer,
|
|
SourceMgr::DiagHandlerTy DiagHandler,
|
|
StringRef YAMLFilePath,
|
|
SmallVectorImpl<YAMLVFSEntry> &CollectedEntries,
|
|
void *DiagContext,
|
|
IntrusiveRefCntPtr<FileSystem> ExternalFS) {
|
|
std::unique_ptr<RedirectingFileSystem> VFS = RedirectingFileSystem::create(
|
|
std::move(Buffer), DiagHandler, YAMLFilePath, DiagContext,
|
|
std::move(ExternalFS));
|
|
if (!VFS)
|
|
return;
|
|
ErrorOr<RedirectingFileSystem::LookupResult> RootResult =
|
|
VFS->lookupPath("/");
|
|
if (!RootResult)
|
|
return;
|
|
SmallVector<StringRef, 8> Components;
|
|
Components.push_back("/");
|
|
getVFSEntries(RootResult->E, Components, CollectedEntries);
|
|
}
|
|
|
|
UniqueID vfs::getNextVirtualUniqueID() {
|
|
static std::atomic<unsigned> UID;
|
|
unsigned ID = ++UID;
|
|
// The following assumes that uint64_t max will never collide with a real
|
|
// dev_t value from the OS.
|
|
return UniqueID(std::numeric_limits<uint64_t>::max(), ID);
|
|
}
|
|
|
|
void YAMLVFSWriter::addEntry(StringRef VirtualPath, StringRef RealPath,
|
|
bool IsDirectory) {
|
|
assert(sys::path::is_absolute(VirtualPath) && "virtual path not absolute");
|
|
assert(sys::path::is_absolute(RealPath) && "real path not absolute");
|
|
assert(!pathHasTraversal(VirtualPath) && "path traversal is not supported");
|
|
Mappings.emplace_back(VirtualPath, RealPath, IsDirectory);
|
|
}
|
|
|
|
void YAMLVFSWriter::addFileMapping(StringRef VirtualPath, StringRef RealPath) {
|
|
addEntry(VirtualPath, RealPath, /*IsDirectory=*/false);
|
|
}
|
|
|
|
void YAMLVFSWriter::addDirectoryMapping(StringRef VirtualPath,
|
|
StringRef RealPath) {
|
|
addEntry(VirtualPath, RealPath, /*IsDirectory=*/true);
|
|
}
|
|
|
|
namespace {
|
|
|
|
class JSONWriter {
|
|
llvm::raw_ostream &OS;
|
|
SmallVector<StringRef, 16> DirStack;
|
|
|
|
unsigned getDirIndent() { return 4 * DirStack.size(); }
|
|
unsigned getFileIndent() { return 4 * (DirStack.size() + 1); }
|
|
bool containedIn(StringRef Parent, StringRef Path);
|
|
StringRef containedPart(StringRef Parent, StringRef Path);
|
|
void startDirectory(StringRef Path);
|
|
void endDirectory();
|
|
void writeEntry(StringRef VPath, StringRef RPath);
|
|
|
|
public:
|
|
JSONWriter(llvm::raw_ostream &OS) : OS(OS) {}
|
|
|
|
void write(ArrayRef<YAMLVFSEntry> Entries,
|
|
std::optional<bool> UseExternalNames,
|
|
std::optional<bool> IsCaseSensitive,
|
|
std::optional<bool> IsOverlayRelative, StringRef OverlayDir);
|
|
};
|
|
|
|
} // namespace
|
|
|
|
bool JSONWriter::containedIn(StringRef Parent, StringRef Path) {
|
|
using namespace llvm::sys;
|
|
|
|
// Compare each path component.
|
|
auto IParent = path::begin(Parent), EParent = path::end(Parent);
|
|
for (auto IChild = path::begin(Path), EChild = path::end(Path);
|
|
IParent != EParent && IChild != EChild; ++IParent, ++IChild) {
|
|
if (*IParent != *IChild)
|
|
return false;
|
|
}
|
|
// Have we exhausted the parent path?
|
|
return IParent == EParent;
|
|
}
|
|
|
|
StringRef JSONWriter::containedPart(StringRef Parent, StringRef Path) {
|
|
assert(!Parent.empty());
|
|
assert(containedIn(Parent, Path));
|
|
return Path.slice(Parent.size() + 1, StringRef::npos);
|
|
}
|
|
|
|
void JSONWriter::startDirectory(StringRef Path) {
|
|
StringRef Name =
|
|
DirStack.empty() ? Path : containedPart(DirStack.back(), Path);
|
|
DirStack.push_back(Path);
|
|
unsigned Indent = getDirIndent();
|
|
OS.indent(Indent) << "{\n";
|
|
OS.indent(Indent + 2) << "'type': 'directory',\n";
|
|
OS.indent(Indent + 2) << "'name': \"" << llvm::yaml::escape(Name) << "\",\n";
|
|
OS.indent(Indent + 2) << "'contents': [\n";
|
|
}
|
|
|
|
void JSONWriter::endDirectory() {
|
|
unsigned Indent = getDirIndent();
|
|
OS.indent(Indent + 2) << "]\n";
|
|
OS.indent(Indent) << "}";
|
|
|
|
DirStack.pop_back();
|
|
}
|
|
|
|
void JSONWriter::writeEntry(StringRef VPath, StringRef RPath) {
|
|
unsigned Indent = getFileIndent();
|
|
OS.indent(Indent) << "{\n";
|
|
OS.indent(Indent + 2) << "'type': 'file',\n";
|
|
OS.indent(Indent + 2) << "'name': \"" << llvm::yaml::escape(VPath) << "\",\n";
|
|
OS.indent(Indent + 2) << "'external-contents': \""
|
|
<< llvm::yaml::escape(RPath) << "\"\n";
|
|
OS.indent(Indent) << "}";
|
|
}
|
|
|
|
void JSONWriter::write(ArrayRef<YAMLVFSEntry> Entries,
|
|
std::optional<bool> UseExternalNames,
|
|
std::optional<bool> IsCaseSensitive,
|
|
std::optional<bool> IsOverlayRelative,
|
|
StringRef OverlayDir) {
|
|
using namespace llvm::sys;
|
|
|
|
OS << "{\n"
|
|
" 'version': 0,\n";
|
|
if (IsCaseSensitive)
|
|
OS << " 'case-sensitive': '" << (*IsCaseSensitive ? "true" : "false")
|
|
<< "',\n";
|
|
if (UseExternalNames)
|
|
OS << " 'use-external-names': '" << (*UseExternalNames ? "true" : "false")
|
|
<< "',\n";
|
|
bool UseOverlayRelative = false;
|
|
if (IsOverlayRelative) {
|
|
UseOverlayRelative = *IsOverlayRelative;
|
|
OS << " 'overlay-relative': '" << (UseOverlayRelative ? "true" : "false")
|
|
<< "',\n";
|
|
}
|
|
OS << " 'roots': [\n";
|
|
|
|
if (!Entries.empty()) {
|
|
const YAMLVFSEntry &Entry = Entries.front();
|
|
|
|
startDirectory(
|
|
Entry.IsDirectory ? Entry.VPath : path::parent_path(Entry.VPath)
|
|
);
|
|
|
|
StringRef RPath = Entry.RPath;
|
|
if (UseOverlayRelative) {
|
|
unsigned OverlayDirLen = OverlayDir.size();
|
|
assert(RPath.substr(0, OverlayDirLen) == OverlayDir &&
|
|
"Overlay dir must be contained in RPath");
|
|
RPath = RPath.slice(OverlayDirLen, RPath.size());
|
|
}
|
|
|
|
bool IsCurrentDirEmpty = true;
|
|
if (!Entry.IsDirectory) {
|
|
writeEntry(path::filename(Entry.VPath), RPath);
|
|
IsCurrentDirEmpty = false;
|
|
}
|
|
|
|
for (const auto &Entry : Entries.slice(1)) {
|
|
StringRef Dir =
|
|
Entry.IsDirectory ? Entry.VPath : path::parent_path(Entry.VPath);
|
|
if (Dir == DirStack.back()) {
|
|
if (!IsCurrentDirEmpty) {
|
|
OS << ",\n";
|
|
}
|
|
} else {
|
|
bool IsDirPoppedFromStack = false;
|
|
while (!DirStack.empty() && !containedIn(DirStack.back(), Dir)) {
|
|
OS << "\n";
|
|
endDirectory();
|
|
IsDirPoppedFromStack = true;
|
|
}
|
|
if (IsDirPoppedFromStack || !IsCurrentDirEmpty) {
|
|
OS << ",\n";
|
|
}
|
|
startDirectory(Dir);
|
|
IsCurrentDirEmpty = true;
|
|
}
|
|
StringRef RPath = Entry.RPath;
|
|
if (UseOverlayRelative) {
|
|
unsigned OverlayDirLen = OverlayDir.size();
|
|
assert(RPath.substr(0, OverlayDirLen) == OverlayDir &&
|
|
"Overlay dir must be contained in RPath");
|
|
RPath = RPath.slice(OverlayDirLen, RPath.size());
|
|
}
|
|
if (!Entry.IsDirectory) {
|
|
writeEntry(path::filename(Entry.VPath), RPath);
|
|
IsCurrentDirEmpty = false;
|
|
}
|
|
}
|
|
|
|
while (!DirStack.empty()) {
|
|
OS << "\n";
|
|
endDirectory();
|
|
}
|
|
OS << "\n";
|
|
}
|
|
|
|
OS << " ]\n"
|
|
<< "}\n";
|
|
}
|
|
|
|
void YAMLVFSWriter::write(llvm::raw_ostream &OS) {
|
|
llvm::sort(Mappings, [](const YAMLVFSEntry &LHS, const YAMLVFSEntry &RHS) {
|
|
return LHS.VPath < RHS.VPath;
|
|
});
|
|
|
|
JSONWriter(OS).write(Mappings, UseExternalNames, IsCaseSensitive,
|
|
IsOverlayRelative, OverlayDir);
|
|
}
|
|
|
|
vfs::recursive_directory_iterator::recursive_directory_iterator(
|
|
FileSystem &FS_, const Twine &Path, std::error_code &EC)
|
|
: FS(&FS_) {
|
|
directory_iterator I = FS->dir_begin(Path, EC);
|
|
if (I != directory_iterator()) {
|
|
State = std::make_shared<detail::RecDirIterState>();
|
|
State->Stack.push(I);
|
|
}
|
|
}
|
|
|
|
vfs::recursive_directory_iterator &
|
|
recursive_directory_iterator::increment(std::error_code &EC) {
|
|
assert(FS && State && !State->Stack.empty() && "incrementing past end");
|
|
assert(!State->Stack.top()->path().empty() && "non-canonical end iterator");
|
|
vfs::directory_iterator End;
|
|
|
|
if (State->HasNoPushRequest)
|
|
State->HasNoPushRequest = false;
|
|
else {
|
|
if (State->Stack.top()->type() == sys::fs::file_type::directory_file) {
|
|
vfs::directory_iterator I = FS->dir_begin(State->Stack.top()->path(), EC);
|
|
if (I != End) {
|
|
State->Stack.push(I);
|
|
return *this;
|
|
}
|
|
}
|
|
}
|
|
|
|
while (!State->Stack.empty() && State->Stack.top().increment(EC) == End)
|
|
State->Stack.pop();
|
|
|
|
if (State->Stack.empty())
|
|
State.reset(); // end iterator
|
|
|
|
return *this;
|
|
}
|