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[VFS] Move RedirectingFileSystem interface into header (NFC)

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This moves the RedirectingFileSystem into the header so it can be
extended. This is needed in LLDB we need a way to obtain the external
path to deal with FILE* and file descriptor APIs.

Discussion on the mailing list:
http://lists.llvm.org/pipermail/llvm-dev/2018-November/127755.html

Differential revision: https://reviews.llvm.org/D54277

llvm-svn: 351265
This commit is contained in:
Jonas Devlieghere 2019-01-15 22:36:41 +00:00
parent cb26f756e1
commit a71043b3cf
2 changed files with 396 additions and 344 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

225
include/llvm/Support/VirtualFileSystem.h
View File

@ -24,6 +24,7 @@
#include "llvm/Support/Chrono.h"
#include "llvm/Support/ErrorOr.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/SourceMgr.h"
#include <cassert>
#include <cstdint>
@ -495,6 +496,230 @@ struct YAMLVFSEntry {
std::string RPath;
};
class VFSFromYamlDirIterImpl;
class RedirectingFileSystemParser;
/// A virtual file system parsed from a YAML file.
///
/// Currently, this class allows creating virtual directories and mapping
/// virtual file paths to existing external files, available in \c ExternalFS.
///
/// The basic structure of the parsed file is:
/// \verbatim
/// {
/// 'version': <version number>,
/// <optional configuration>
/// 'roots': [
/// <directory entries>
/// ]
/// }
/// \endverbatim
///
/// All configuration options are optional.
/// 'case-sensitive': <boolean, default=true>
/// 'use-external-names': <boolean, default=true>
/// 'overlay-relative': <boolean, default=false>
/// 'fallthrough': <boolean, default=true>
///
/// Virtual directories are represented as
/// \verbatim
/// {
/// 'type': 'directory',
/// 'name': <string>,
/// 'contents': [ <file or directory entries> ]
/// }
/// \endverbatim
///
/// The default attributes for virtual directories are:
/// \verbatim
/// MTime = now() when created
/// Perms = 0777
/// User = Group = 0
/// Size = 0
/// UniqueID = unspecified unique value
/// \endverbatim
///
/// Re-mapped files are represented as
/// \verbatim
/// {
/// 'type': 'file',
/// 'name': <string>,
/// 'use-external-name': <boolean> # Optional
/// 'external-contents': <path to external file>
/// }
/// \endverbatim
///
/// and inherit their attributes from the external contents.
///
/// In both cases, the 'name' field may contain multiple path components (e.g.
/// /path/to/file). However, any directory that contains more than one child
/// must be uniquely represented by a directory entry.
class RedirectingFileSystem : public vfs::FileSystem {
public:
enum EntryKind { EK_Directory, EK_File };
/// A single file or directory in the VFS.
class Entry {
EntryKind Kind;
std::string Name;
public:
Entry(EntryKind K, StringRef Name) : Kind(K), Name(Name) {}
virtual ~Entry() = default;
StringRef getName() const { return Name; }
EntryKind getKind() const { return Kind; }
};
class RedirectingDirectoryEntry : public Entry {
std::vector<std::unique_ptr<Entry>> Contents;
Status S;
public:
RedirectingDirectoryEntry(StringRef Name,
std::vector<std::unique_ptr<Entry>> Contents,
Status S)
: Entry(EK_Directory, Name), Contents(std::move(Contents)),
S(std::move(S)) {}
RedirectingDirectoryEntry(StringRef Name, Status S)
: Entry(EK_Directory, Name), S(std::move(S)) {}
Status getStatus() { return S; }
void addContent(std::unique_ptr<Entry> Content) {
Contents.push_back(std::move(Content));
}
Entry *getLastContent() const { return Contents.back().get(); }
using iterator = decltype(Contents)::iterator;
iterator contents_begin() { return Contents.begin(); }
iterator contents_end() { return Contents.end(); }
static bool classof(const Entry *E) { return E->getKind() == EK_Directory; }
};
class RedirectingFileEntry : public Entry {
public:
enum NameKind { NK_NotSet, NK_External, NK_Virtual };
private:
std::string ExternalContentsPath;
NameKind UseName;
public:
RedirectingFileEntry(StringRef Name, StringRef ExternalContentsPath,
NameKind UseName)
: Entry(EK_File, Name), ExternalContentsPath(ExternalContentsPath),
UseName(UseName) {}
StringRef getExternalContentsPath() const { return ExternalContentsPath; }
/// whether to use the external path as the name for this file.
bool useExternalName(bool GlobalUseExternalName) const {
return UseName == NK_NotSet ? GlobalUseExternalName
: (UseName == NK_External);
}
NameKind getUseName() const { return UseName; }
static bool classof(const Entry *E) { return E->getKind() == EK_File; }
};
private:
friend class VFSFromYamlDirIterImpl;
friend class RedirectingFileSystemParser;
/// The root(s) of the virtual file system.
std::vector<std::unique_ptr<Entry>> Roots;
/// The file system to use for external references.
IntrusiveRefCntPtr<FileSystem> ExternalFS;
/// If IsRelativeOverlay is set, this represents the directory
/// path that should be prefixed to each 'external-contents' entry
/// when reading from YAML files.
std::string ExternalContentsPrefixDir;
/// @name Configuration
/// @{
/// Whether to perform case-sensitive comparisons.
///
/// Currently, case-insensitive matching only works correctly with ASCII.
bool CaseSensitive = true;
/// IsRelativeOverlay marks whether a ExternalContentsPrefixDir path must
/// be prefixed in every 'external-contents' when reading from YAML files.
bool IsRelativeOverlay = false;
/// Whether to use to use the value of 'external-contents' for the
/// names of files. This global value is overridable on a per-file basis.
bool UseExternalNames = true;
/// Whether to attempt a file lookup in external file system after it wasn't
/// found in VFS.
bool IsFallthrough = true;
/// @}
/// Virtual file paths and external files could be canonicalized without "..",
/// "." and "./" in their paths. FIXME: some unittests currently fail on
/// win32 when using remove_dots and remove_leading_dotslash on paths.
bool UseCanonicalizedPaths =
#ifdef _WIN32
false;
#else
true;
#endif
RedirectingFileSystem(IntrusiveRefCntPtr<FileSystem> ExternalFS)
: ExternalFS(std::move(ExternalFS)) {}
/// Looks up the path <tt>[Start, End)</tt> in \p From, possibly
/// recursing into the contents of \p From if it is a directory.
ErrorOr<Entry *> lookupPath(llvm::sys::path::const_iterator Start,
llvm::sys::path::const_iterator End,
Entry *From) const;
/// Get the status of a given an \c Entry.
ErrorOr<Status> status(const Twine &Path, Entry *E);
public:
/// Looks up \p Path in \c Roots.
ErrorOr<Entry *> lookupPath(const Twine &Path) const;
/// Parses \p Buffer, which is expected to be in YAML format and
/// returns a virtual file system representing its contents.
static RedirectingFileSystem *
create(std::unique_ptr<MemoryBuffer> Buffer,
SourceMgr::DiagHandlerTy DiagHandler, StringRef YAMLFilePath,
void *DiagContext, IntrusiveRefCntPtr<FileSystem> ExternalFS);
ErrorOr<Status> status(const Twine &Path) override;
ErrorOr<std::unique_ptr<File>> openFileForRead(const Twine &Path) override;
std::error_code getRealPath(const Twine &Path,
SmallVectorImpl<char> &Output) const override;
llvm::ErrorOr<std::string> getCurrentWorkingDirectory() const override;
std::error_code setCurrentWorkingDirectory(const Twine &Path) override;
std::error_code isLocal(const Twine &Path, bool &Result) override;
directory_iterator dir_begin(const Twine &Dir, std::error_code &EC) override;
void setExternalContentsPrefixDir(StringRef PrefixDir);
StringRef getExternalContentsPrefixDir() const;
#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
LLVM_DUMP_METHOD void dump() const;
LLVM_DUMP_METHOD void dumpEntry(Entry *E, int NumSpaces = 0) const;
#endif
};
/// Collect all pairs of <virtual path, real path> entries from the
/// \p YAMLFilePath. This is used by the module dependency collector to forward
/// the entries into the reproducer output VFS YAML file.

515
lib/Support/VirtualFileSystem.cpp
View File

@ -943,84 +943,12 @@ std::error_code InMemoryFileSystem::isLocal(const Twine &Path, bool &Result) {
// RedirectingFileSystem implementation
//===-----------------------------------------------------------------------===/
namespace {
enum EntryKind { EK_Directory, EK_File };
/// A single file or directory in the VFS.
class Entry {
EntryKind Kind;
std::string Name;
public:
Entry(EntryKind K, StringRef Name) : Kind(K), Name(Name) {}
virtual ~Entry() = default;
StringRef getName() const { return Name; }
EntryKind getKind() const { return Kind; }
};
class RedirectingDirectoryEntry : public Entry {
std::vector<std::unique_ptr<Entry>> Contents;
Status S;
public:
RedirectingDirectoryEntry(StringRef Name,
std::vector<std::unique_ptr<Entry>> Contents,
Status S)
: Entry(EK_Directory, Name), Contents(std::move(Contents)),
S(std::move(S)) {}
RedirectingDirectoryEntry(StringRef Name, Status S)
: Entry(EK_Directory, Name), S(std::move(S)) {}
Status getStatus() { return S; }
void addContent(std::unique_ptr<Entry> Content) {
Contents.push_back(std::move(Content));
}
Entry *getLastContent() const { return Contents.back().get(); }
using iterator = decltype(Contents)::iterator;
iterator contents_begin() { return Contents.begin(); }
iterator contents_end() { return Contents.end(); }
static bool classof(const Entry *E) { return E->getKind() == EK_Directory; }
};
class RedirectingFileEntry : public Entry {
public:
enum NameKind { NK_NotSet, NK_External, NK_Virtual };
private:
std::string ExternalContentsPath;
NameKind UseName;
public:
RedirectingFileEntry(StringRef Name, StringRef ExternalContentsPath,
NameKind UseName)
: Entry(EK_File, Name), ExternalContentsPath(ExternalContentsPath),
UseName(UseName) {}
StringRef getExternalContentsPath() const { return ExternalContentsPath; }
/// whether to use the external path as the name for this file.
bool useExternalName(bool GlobalUseExternalName) const {
return UseName == NK_NotSet ? GlobalUseExternalName
: (UseName == NK_External);
}
NameKind getUseName() const { return UseName; }
static bool classof(const Entry *E) { return E->getKind() == EK_File; }
};
// FIXME: reuse implementation common with OverlayFSDirIterImpl as these
// iterators are conceptually similar.
class VFSFromYamlDirIterImpl : public llvm::vfs::detail::DirIterImpl {
class llvm::vfs::VFSFromYamlDirIterImpl
: public llvm::vfs::detail::DirIterImpl {
std::string Dir;
RedirectingDirectoryEntry::iterator Current, End;
RedirectingFileSystem::RedirectingDirectoryEntry::iterator Current, End;
// To handle 'fallthrough' mode we need to iterate at first through
// RedirectingDirectoryEntry and then through ExternalFS. These operations are
@ -1050,216 +978,92 @@ class VFSFromYamlDirIterImpl : public llvm::vfs::detail::DirIterImpl {
/// @}
public:
VFSFromYamlDirIterImpl(const Twine &Path,
RedirectingDirectoryEntry::iterator Begin,
RedirectingDirectoryEntry::iterator End,
bool IterateExternalFS, FileSystem &ExternalFS,
std::error_code &EC);
VFSFromYamlDirIterImpl(
const Twine &Path,
RedirectingFileSystem::RedirectingDirectoryEntry::iterator Begin,
RedirectingFileSystem::RedirectingDirectoryEntry::iterator End,
bool IterateExternalFS, FileSystem &ExternalFS, std::error_code &EC);
std::error_code increment() override;
};
/// A virtual file system parsed from a YAML file.
///
/// Currently, this class allows creating virtual directories and mapping
/// virtual file paths to existing external files, available in \c ExternalFS.
///
/// The basic structure of the parsed file is:
/// \verbatim
/// {
/// 'version': <version number>,
/// <optional configuration>
/// 'roots': [
/// <directory entries>
/// ]
/// }
/// \endverbatim
///
/// All configuration options are optional.
/// 'case-sensitive': <boolean, default=true>
/// 'use-external-names': <boolean, default=true>
/// 'overlay-relative': <boolean, default=false>
/// 'fallthrough': <boolean, default=true>
///
/// Virtual directories are represented as
/// \verbatim
/// {
/// 'type': 'directory',
/// 'name': <string>,
/// 'contents': [ <file or directory entries> ]
/// }
/// \endverbatim
///
/// The default attributes for virtual directories are:
/// \verbatim
/// MTime = now() when created
/// Perms = 0777
/// User = Group = 0
/// Size = 0
/// UniqueID = unspecified unique value
/// \endverbatim
///
/// Re-mapped files are represented as
/// \verbatim
/// {
/// 'type': 'file',
/// 'name': <string>,
/// 'use-external-name': <boolean> # Optional
/// 'external-contents': <path to external file>
/// }
/// \endverbatim
///
/// and inherit their attributes from the external contents.
///
/// In both cases, the 'name' field may contain multiple path components (e.g.
/// /path/to/file). However, any directory that contains more than one child
/// must be uniquely represented by a directory entry.
class RedirectingFileSystem : public vfs::FileSystem {
friend class RedirectingFileSystemParser;
llvm::ErrorOr<std::string>
RedirectingFileSystem::getCurrentWorkingDirectory() const {
return ExternalFS->getCurrentWorkingDirectory();
}
/// The root(s) of the virtual file system.
std::vector<std::unique_ptr<Entry>> Roots;
std::error_code
RedirectingFileSystem::setCurrentWorkingDirectory(const Twine &Path) {
return ExternalFS->setCurrentWorkingDirectory(Path);
}
/// The file system to use for external references.
IntrusiveRefCntPtr<FileSystem> ExternalFS;
std::error_code RedirectingFileSystem::isLocal(const Twine &Path,
bool &Result) {
return ExternalFS->isLocal(Path, Result);
}
/// If IsRelativeOverlay is set, this represents the directory
/// path that should be prefixed to each 'external-contents' entry
/// when reading from YAML files.
std::string ExternalContentsPrefixDir;
/// @name Configuration
/// @{
/// Whether to perform case-sensitive comparisons.
///
/// Currently, case-insensitive matching only works correctly with ASCII.
bool CaseSensitive = true;
/// IsRelativeOverlay marks whether a ExternalContentsPrefixDir path must
/// be prefixed in every 'external-contents' when reading from YAML files.
bool IsRelativeOverlay = false;
/// Whether to use to use the value of 'external-contents' for the
/// names of files. This global value is overridable on a per-file basis.
bool UseExternalNames = true;
/// Whether to attempt a file lookup in external file system after it wasn't
/// found in VFS.
bool IsFallthrough = true;
/// @}
/// Virtual file paths and external files could be canonicalized without "..",
/// "." and "./" in their paths. FIXME: some unittests currently fail on
/// win32 when using remove_dots and remove_leading_dotslash on paths.
bool UseCanonicalizedPaths =
#ifdef _WIN32
false;
#else
true;
#endif
private:
RedirectingFileSystem(IntrusiveRefCntPtr<FileSystem> ExternalFS)
: ExternalFS(std::move(ExternalFS)) {}
/// Looks up the path <tt>[Start, End)</tt> in \p From, possibly
/// recursing into the contents of \p From if it is a directory.
ErrorOr<Entry *> lookupPath(sys::path::const_iterator Start,
sys::path::const_iterator End, Entry *From) const;
/// Get the status of a given an \c Entry.
ErrorOr<Status> status(const Twine &Path, Entry *E);
public:
/// Looks up \p Path in \c Roots.
ErrorOr<Entry *> lookupPath(const Twine &Path) const;
/// Parses \p Buffer, which is expected to be in YAML format and
/// returns a virtual file system representing its contents.
static RedirectingFileSystem *
create(std::unique_ptr<MemoryBuffer> Buffer,
SourceMgr::DiagHandlerTy DiagHandler, StringRef YAMLFilePath,
void *DiagContext, IntrusiveRefCntPtr<FileSystem> ExternalFS);
ErrorOr<Status> status(const Twine &Path) override;
ErrorOr<std::unique_ptr<File>> openFileForRead(const Twine &Path) override;
std::error_code getRealPath(const Twine &Path,
SmallVectorImpl<char> &Output) const override;
llvm::ErrorOr<std::string> getCurrentWorkingDirectory() const override {
return ExternalFS->getCurrentWorkingDirectory();
directory_iterator RedirectingFileSystem::dir_begin(const Twine &Dir,
std::error_code &EC) {
ErrorOr<RedirectingFileSystem::Entry *> E = lookupPath(Dir);
if (!E) {
EC = E.getError();
if (IsFallthrough && EC == errc::no_such_file_or_directory)
return ExternalFS->dir_begin(Dir, EC);
return {};
}
ErrorOr<Status> S = status(Dir, *E);
if (!S) {
EC = S.getError();
return {};
}
if (!S->isDirectory()) {
EC = std::error_code(static_cast<int>(errc::not_a_directory),
std::system_category());
return {};
}
std::error_code setCurrentWorkingDirectory(const Twine &Path) override {
return ExternalFS->setCurrentWorkingDirectory(Path);
}
auto *D = cast<RedirectingFileSystem::RedirectingDirectoryEntry>(*E);
return directory_iterator(std::make_shared<VFSFromYamlDirIterImpl>(
Dir, D->contents_begin(), D->contents_end(),
/*IterateExternalFS=*/IsFallthrough, *ExternalFS, EC));
}
std::error_code isLocal(const Twine &Path, bool &Result) override {
return ExternalFS->isLocal(Path, Result);
}
void RedirectingFileSystem::setExternalContentsPrefixDir(StringRef PrefixDir) {
ExternalContentsPrefixDir = PrefixDir.str();
}
directory_iterator dir_begin(const Twine &Dir, std::error_code &EC) override {
ErrorOr<Entry *> E = lookupPath(Dir);
if (!E) {
EC = E.getError();
if (IsFallthrough && EC == errc::no_such_file_or_directory)
return ExternalFS->dir_begin(Dir, EC);
return {};
}
ErrorOr<Status> S = status(Dir, *E);
if (!S) {
EC = S.getError();
return {};
}
if (!S->isDirectory()) {
EC = std::error_code(static_cast<int>(errc::not_a_directory),
std::system_category());
return {};
}
auto *D = cast<RedirectingDirectoryEntry>(*E);
return directory_iterator(std::make_shared<VFSFromYamlDirIterImpl>(
Dir, D->contents_begin(), D->contents_end(),
/*IterateExternalFS=*/IsFallthrough, *ExternalFS, EC));
}
void setExternalContentsPrefixDir(StringRef PrefixDir) {
ExternalContentsPrefixDir = PrefixDir.str();
}
StringRef getExternalContentsPrefixDir() const {
return ExternalContentsPrefixDir;
}
StringRef RedirectingFileSystem::getExternalContentsPrefixDir() const {
return ExternalContentsPrefixDir;
}
#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
LLVM_DUMP_METHOD void dump() const {
for (const auto &Root : Roots)
dumpEntry(Root.get());
}
LLVM_DUMP_METHOD void dumpEntry(Entry *E, int NumSpaces = 0) const {
StringRef Name = E->getName();
for (int i = 0, e = NumSpaces; i < e; ++i)
dbgs() << " ";
dbgs() << "'" << Name.str().c_str() << "'"
<< "\n";
if (E->getKind() == EK_Directory) {
auto *DE = dyn_cast<RedirectingDirectoryEntry>(E);
assert(DE && "Should be a directory");
for (std::unique_ptr<Entry> &SubEntry :
llvm::make_range(DE->contents_begin(), DE->contents_end()))
dumpEntry(SubEntry.get(), NumSpaces + 2);
}
LLVM_DUMP_METHOD void RedirectingFileSystem::dump() const {
for (const auto &Root : Roots)
dumpEntry(Root.get());
}
LLVM_DUMP_METHOD void
RedirectingFileSystem::dumpEntry(RedirectingFileSystem::Entry *E,
int NumSpaces) const {
StringRef Name = E->getName();
for (int i = 0, e = NumSpaces; i < e; ++i)
dbgs() << " ";
dbgs() << "'" << Name.str().c_str() << "'"
<< "\n";
if (E->getKind() == RedirectingFileSystem::EK_Directory) {
auto *DE = dyn_cast<RedirectingFileSystem::RedirectingDirectoryEntry>(E);
assert(DE && "Should be a directory");
for (std::unique_ptr<Entry> &SubEntry :
llvm::make_range(DE->contents_begin(), DE->contents_end()))
dumpEntry(SubEntry.get(), NumSpaces + 2);
}
}
#endif
};
/// A helper class to hold the common YAML parsing state.
class RedirectingFileSystemParser {
class llvm::vfs::RedirectingFileSystemParser {
yaml::Stream &Stream;
void error(yaml::Node *N, const Twine &Msg) { Stream.printError(N, Msg); }
@ -1334,8 +1138,9 @@ class RedirectingFileSystemParser {
return true;
}
Entry *lookupOrCreateEntry(RedirectingFileSystem *FS, StringRef Name,
Entry *ParentEntry = nullptr) {
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())) {
@ -1344,20 +1149,24 @@ class RedirectingFileSystemParser {
}
}
} else { // Advance to the next component
auto *DE = dyn_cast<RedirectingDirectoryEntry>(ParentEntry);
for (std::unique_ptr<Entry> &Content :
auto *DE = dyn_cast<RedirectingFileSystem::RedirectingDirectoryEntry>(
ParentEntry);
for (std::unique_ptr<RedirectingFileSystem::Entry> &Content :
llvm::make_range(DE->contents_begin(), DE->contents_end())) {
auto *DirContent = dyn_cast<RedirectingDirectoryEntry>(Content.get());
auto *DirContent =
dyn_cast<RedirectingFileSystem::RedirectingDirectoryEntry>(
Content.get());
if (DirContent && Name.equals(Content->getName()))
return DirContent;
}
}
// ... or create a new one
std::unique_ptr<Entry> E = llvm::make_unique<RedirectingDirectoryEntry>(
Name,
Status("", getNextVirtualUniqueID(), std::chrono::system_clock::now(),
0, 0, 0, file_type::directory_file, sys::fs::all_all));
std::unique_ptr<RedirectingFileSystem::Entry> E =
llvm::make_unique<RedirectingFileSystem::RedirectingDirectoryEntry>(
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));
@ -1365,42 +1174,47 @@ class RedirectingFileSystemParser {
return ParentEntry;
}
auto *DE = dyn_cast<RedirectingDirectoryEntry>(ParentEntry);
auto *DE =
dyn_cast<RedirectingFileSystem::RedirectingDirectoryEntry>(ParentEntry);
DE->addContent(std::move(E));
return DE->getLastContent();
}
void uniqueOverlayTree(RedirectingFileSystem *FS, Entry *SrcE,
Entry *NewParentE = nullptr) {
void uniqueOverlayTree(RedirectingFileSystem *FS,
RedirectingFileSystem::Entry *SrcE,
RedirectingFileSystem::Entry *NewParentE = nullptr) {
StringRef Name = SrcE->getName();
switch (SrcE->getKind()) {
case EK_Directory: {
auto *DE = dyn_cast<RedirectingDirectoryEntry>(SrcE);
case RedirectingFileSystem::EK_Directory: {
auto *DE =
dyn_cast<RedirectingFileSystem::RedirectingDirectoryEntry>(SrcE);
assert(DE && "Must be a directory");
// 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<Entry> &SubEntry :
for (std::unique_ptr<RedirectingFileSystem::Entry> &SubEntry :
llvm::make_range(DE->contents_begin(), DE->contents_end()))
uniqueOverlayTree(FS, SubEntry.get(), NewParentE);
break;
}
case EK_File: {
auto *FE = dyn_cast<RedirectingFileEntry>(SrcE);
case RedirectingFileSystem::EK_File: {
auto *FE = dyn_cast<RedirectingFileSystem::RedirectingFileEntry>(SrcE);
assert(FE && "Must be a file");
assert(NewParentE && "Parent entry must exist");
auto *DE = dyn_cast<RedirectingDirectoryEntry>(NewParentE);
DE->addContent(llvm::make_unique<RedirectingFileEntry>(
Name, FE->getExternalContentsPath(), FE->getUseName()));
auto *DE = dyn_cast<RedirectingFileSystem::RedirectingDirectoryEntry>(
NewParentE);
DE->addContent(
llvm::make_unique<RedirectingFileSystem::RedirectingFileEntry>(
Name, FE->getExternalContentsPath(), FE->getUseName()));
break;
}
}
}
std::unique_ptr<Entry> parseEntry(yaml::Node *N, RedirectingFileSystem *FS,
bool IsRootEntry) {
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");
@ -1418,12 +1232,14 @@ class RedirectingFileSystemParser {
DenseMap<StringRef, KeyStatus> Keys(std::begin(Fields), std::end(Fields));
bool HasContents = false; // external or otherwise
std::vector<std::unique_ptr<Entry>> EntryArrayContents;
std::vector<std::unique_ptr<RedirectingFileSystem::Entry>>
EntryArrayContents;
std::string ExternalContentsPath;
std::string Name;
yaml::Node *NameValueNode;
auto UseExternalName = RedirectingFileEntry::NK_NotSet;
EntryKind Kind;
auto UseExternalName =
RedirectingFileSystem::RedirectingFileEntry::NK_NotSet;
RedirectingFileSystem::EntryKind Kind;
for (auto &I : *M) {
StringRef Key;
@ -1456,9 +1272,9 @@ class RedirectingFileSystemParser {
if (!parseScalarString(I.getValue(), Value, Buffer))
return nullptr;
if (Value == "file")
Kind = EK_File;
Kind = RedirectingFileSystem::EK_File;
else if (Value == "directory")
Kind = EK_Directory;
Kind = RedirectingFileSystem::EK_Directory;
else {
error(I.getValue(), "unknown value for 'type'");
return nullptr;
@ -1478,7 +1294,7 @@ class RedirectingFileSystemParser {
}
for (auto &I : *Contents) {
if (std::unique_ptr<Entry> E =
if (std::unique_ptr<RedirectingFileSystem::Entry> E =
parseEntry(&I, FS, /*IsRootEntry*/ false))
EntryArrayContents.push_back(std::move(E));
else
@ -1515,8 +1331,9 @@ class RedirectingFileSystemParser {
bool Val;
if (!parseScalarBool(I.getValue(), Val))
return nullptr;
UseExternalName = Val ? RedirectingFileEntry::NK_External
: RedirectingFileEntry::NK_Virtual;
UseExternalName =
Val ? RedirectingFileSystem::RedirectingFileEntry::NK_External
: RedirectingFileSystem::RedirectingFileEntry::NK_Virtual;
} else {
llvm_unreachable("key missing from Keys");
}
@ -1534,8 +1351,9 @@ class RedirectingFileSystemParser {
return nullptr;
// check invalid configuration
if (Kind == EK_Directory &&
UseExternalName != RedirectingFileEntry::NK_NotSet) {
if (Kind == RedirectingFileSystem::EK_Directory &&
UseExternalName !=
RedirectingFileSystem::RedirectingFileEntry::NK_NotSet) {
error(N, "'use-external-name' is not supported for directories");
return nullptr;
}
@ -1556,17 +1374,19 @@ class RedirectingFileSystemParser {
// Get the last component
StringRef LastComponent = sys::path::filename(Trimmed);
std::unique_ptr<Entry> Result;
std::unique_ptr<RedirectingFileSystem::Entry> Result;
switch (Kind) {
case EK_File:
Result = llvm::make_unique<RedirectingFileEntry>(
case RedirectingFileSystem::EK_File:
Result = llvm::make_unique<RedirectingFileSystem::RedirectingFileEntry>(
LastComponent, std::move(ExternalContentsPath), UseExternalName);
break;
case EK_Directory:
Result = llvm::make_unique<RedirectingDirectoryEntry>(
LastComponent, std::move(EntryArrayContents),
Status("", getNextVirtualUniqueID(), std::chrono::system_clock::now(),
0, 0, 0, file_type::directory_file, sys::fs::all_all));
case RedirectingFileSystem::EK_Directory:
Result =
llvm::make_unique<RedirectingFileSystem::RedirectingDirectoryEntry>(
LastComponent, std::move(EntryArrayContents),
Status("", getNextVirtualUniqueID(),
std::chrono::system_clock::now(), 0, 0, 0,
file_type::directory_file, sys::fs::all_all));
break;
}
@ -1578,12 +1398,14 @@ class RedirectingFileSystemParser {
for (sys::path::reverse_iterator I = sys::path::rbegin(Parent),
E = sys::path::rend(Parent);
I != E; ++I) {
std::vector<std::unique_ptr<Entry>> Entries;
std::vector<std::unique_ptr<RedirectingFileSystem::Entry>> Entries;
Entries.push_back(std::move(Result));
Result = llvm::make_unique<RedirectingDirectoryEntry>(
*I, std::move(Entries),
Status("", getNextVirtualUniqueID(), std::chrono::system_clock::now(),
0, 0, 0, file_type::directory_file, sys::fs::all_all));
Result =
llvm::make_unique<RedirectingFileSystem::RedirectingDirectoryEntry>(
*I, std::move(Entries),
Status("", getNextVirtualUniqueID(),
std::chrono::system_clock::now(), 0, 0, 0,
file_type::directory_file, sys::fs::all_all));
}
return Result;
}
@ -1609,7 +1431,7 @@ public:
};
DenseMap<StringRef, KeyStatus> Keys(std::begin(Fields), std::end(Fields));
std::vector<std::unique_ptr<Entry>> RootEntries;
std::vector<std::unique_ptr<RedirectingFileSystem::Entry>> RootEntries;
// Parse configuration and 'roots'
for (auto &I : *Top) {
@ -1629,7 +1451,7 @@ public:
}
for (auto &I : *Roots) {
if (std::unique_ptr<Entry> E =
if (std::unique_ptr<RedirectingFileSystem::Entry> E =
parseEntry(&I, FS, /*IsRootEntry*/ true))
RootEntries.push_back(std::move(E));
else
@ -1686,8 +1508,6 @@ public:
}
};
} // namespace
RedirectingFileSystem *
RedirectingFileSystem::create(std::unique_ptr<MemoryBuffer> Buffer,
SourceMgr::DiagHandlerTy DiagHandler,
@ -1731,7 +1551,8 @@ RedirectingFileSystem::create(std::unique_ptr<MemoryBuffer> Buffer,
return FS.release();
}
ErrorOr<Entry *> RedirectingFileSystem::lookupPath(const Twine &Path_) const {
ErrorOr<RedirectingFileSystem::Entry *>
RedirectingFileSystem::lookupPath(const Twine &Path_) const {
SmallString<256> Path;
Path_.toVector(Path);
@ -1753,17 +1574,18 @@ ErrorOr<Entry *> RedirectingFileSystem::lookupPath(const Twine &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<Entry *> Result = lookupPath(Start, End, Root.get());
ErrorOr<RedirectingFileSystem::Entry *> Result =
lookupPath(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<Entry *>
ErrorOr<RedirectingFileSystem::Entry *>
RedirectingFileSystem::lookupPath(sys::path::const_iterator Start,
sys::path::const_iterator End,
Entry *From) const {
RedirectingFileSystem::Entry *From) const {
#ifndef _WIN32
assert(!isTraversalComponent(*Start) &&
!isTraversalComponent(From->getName()) &&
@ -1792,13 +1614,14 @@ RedirectingFileSystem::lookupPath(sys::path::const_iterator Start,
}
}
auto *DE = dyn_cast<RedirectingDirectoryEntry>(From);
auto *DE = dyn_cast<RedirectingFileSystem::RedirectingDirectoryEntry>(From);
if (!DE)
return make_error_code(llvm::errc::not_a_directory);
for (const std::unique_ptr<Entry> &DirEntry :
for (const std::unique_ptr<RedirectingFileSystem::Entry> &DirEntry :
llvm::make_range(DE->contents_begin(), DE->contents_end())) {
ErrorOr<Entry *> Result = lookupPath(Start, End, DirEntry.get());
ErrorOr<RedirectingFileSystem::Entry *> Result =
lookupPath(Start, End, DirEntry.get());
if (Result || Result.getError() != llvm::errc::no_such_file_or_directory)
return Result;
}
@ -1814,9 +1637,10 @@ static Status getRedirectedFileStatus(const Twine &Path, bool UseExternalNames,
return S;
}
ErrorOr<Status> RedirectingFileSystem::status(const Twine &Path, Entry *E) {
ErrorOr<Status> RedirectingFileSystem::status(const Twine &Path,
RedirectingFileSystem::Entry *E) {
assert(E != nullptr);
if (auto *F = dyn_cast<RedirectingFileEntry>(E)) {
if (auto *F = dyn_cast<RedirectingFileSystem::RedirectingFileEntry>(E)) {
ErrorOr<Status> S = ExternalFS->status(F->getExternalContentsPath());
assert(!S || S->getName() == F->getExternalContentsPath());
if (S)
@ -1824,13 +1648,13 @@ ErrorOr<Status> RedirectingFileSystem::status(const Twine &Path, Entry *E) {
*S);
return S;
} else { // directory
auto *DE = cast<RedirectingDirectoryEntry>(E);
auto *DE = cast<RedirectingFileSystem::RedirectingDirectoryEntry>(E);
return Status::copyWithNewName(DE->getStatus(), Path.str());
}
}
ErrorOr<Status> RedirectingFileSystem::status(const Twine &Path) {
ErrorOr<Entry *> Result = lookupPath(Path);
ErrorOr<RedirectingFileSystem::Entry *> Result = lookupPath(Path);
if (!Result) {
if (IsFallthrough &&
Result.getError() == llvm::errc::no_such_file_or_directory) {
@ -1868,7 +1692,7 @@ public:
ErrorOr<std::unique_ptr<File>>
RedirectingFileSystem::openFileForRead(const Twine &Path) {
ErrorOr<Entry *> E = lookupPath(Path);
ErrorOr<RedirectingFileSystem::Entry *> E = lookupPath(Path);
if (!E) {
if (IsFallthrough &&
E.getError() == llvm::errc::no_such_file_or_directory) {
@ -1877,7 +1701,7 @@ RedirectingFileSystem::openFileForRead(const Twine &Path) {
return E.getError();
}
auto *F = dyn_cast<RedirectingFileEntry>(*E);
auto *F = dyn_cast<RedirectingFileSystem::RedirectingFileEntry>(*E);
if (!F) // FIXME: errc::not_a_file?
return make_error_code(llvm::errc::invalid_argument);
@ -1899,7 +1723,7 @@ RedirectingFileSystem::openFileForRead(const Twine &Path) {
std::error_code
RedirectingFileSystem::getRealPath(const Twine &Path,
SmallVectorImpl<char> &Output) const {
ErrorOr<Entry *> Result = lookupPath(Path);
ErrorOr<RedirectingFileSystem::Entry *> Result = lookupPath(Path);
if (!Result) {
if (IsFallthrough &&
Result.getError() == llvm::errc::no_such_file_or_directory) {
@ -1908,7 +1732,8 @@ RedirectingFileSystem::getRealPath(const Twine &Path,
return Result.getError();
}
if (auto *F = dyn_cast<RedirectingFileEntry>(*Result)) {
if (auto *F =
dyn_cast<RedirectingFileSystem::RedirectingFileEntry>(*Result)) {
return ExternalFS->getRealPath(F->getExternalContentsPath(), Output);
}
// Even if there is a directory entry, fall back to ExternalFS if allowed,
@ -1927,13 +1752,14 @@ vfs::getVFSFromYAML(std::unique_ptr<MemoryBuffer> Buffer,
std::move(ExternalFS));
}
static void getVFSEntries(Entry *SrcE, SmallVectorImpl<StringRef> &Path,
static void getVFSEntries(RedirectingFileSystem::Entry *SrcE,
SmallVectorImpl<StringRef> &Path,
SmallVectorImpl<YAMLVFSEntry> &Entries) {
auto Kind = SrcE->getKind();
if (Kind == EK_Directory) {
auto *DE = dyn_cast<RedirectingDirectoryEntry>(SrcE);
if (Kind == RedirectingFileSystem::EK_Directory) {
auto *DE = dyn_cast<RedirectingFileSystem::RedirectingDirectoryEntry>(SrcE);
assert(DE && "Must be a directory");
for (std::unique_ptr<Entry> &SubEntry :
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);
@ -1942,8 +1768,8 @@ static void getVFSEntries(Entry *SrcE, SmallVectorImpl<StringRef> &Path,
return;
}
assert(Kind == EK_File && "Must be a EK_File");
auto *FE = dyn_cast<RedirectingFileEntry>(SrcE);
assert(Kind == RedirectingFileSystem::EK_File && "Must be a EK_File");
auto *FE = dyn_cast<RedirectingFileSystem::RedirectingFileEntry>(SrcE);
assert(FE && "Must be a file");
SmallString<128> VPath;
for (auto &Comp : Path)
@ -1960,7 +1786,7 @@ void vfs::collectVFSFromYAML(std::unique_ptr<MemoryBuffer> Buffer,
RedirectingFileSystem *VFS = RedirectingFileSystem::create(
std::move(Buffer), DiagHandler, YAMLFilePath, DiagContext,
std::move(ExternalFS));
ErrorOr<Entry *> RootE = VFS->lookupPath("/");
ErrorOr<RedirectingFileSystem::Entry *> RootE = VFS->lookupPath("/");
if (!RootE)
return;
SmallVector<StringRef, 8> Components;
@ -2136,9 +1962,10 @@ void YAMLVFSWriter::write(llvm::raw_ostream &OS) {
}
VFSFromYamlDirIterImpl::VFSFromYamlDirIterImpl(
const Twine &_Path, RedirectingDirectoryEntry::iterator Begin,
RedirectingDirectoryEntry::iterator End, bool IterateExternalFS,
FileSystem &ExternalFS, std::error_code &EC)
const Twine &_Path,
RedirectingFileSystem::RedirectingDirectoryEntry::iterator Begin,
RedirectingFileSystem::RedirectingDirectoryEntry::iterator End,
bool IterateExternalFS, FileSystem &ExternalFS, std::error_code &EC)
: Dir(_Path.str()), Current(Begin), End(End),
IterateExternalFS(IterateExternalFS), ExternalFS(ExternalFS) {
EC = incrementImpl(/*IsFirstTime=*/true);
@ -2178,10 +2005,10 @@ std::error_code VFSFromYamlDirIterImpl::incrementContent(bool IsFirstTime) {
llvm::sys::path::append(PathStr, (*Current)->getName());
sys::fs::file_type Type;
switch ((*Current)->getKind()) {
case EK_Directory:
case RedirectingFileSystem::EK_Directory:
Type = sys::fs::file_type::directory_file;
break;
case EK_File:
case RedirectingFileSystem::EK_File:
Type = sys::fs::file_type::regular_file;
break;
}