forked from OSchip/llvm-project
661 lines
25 KiB
C++
661 lines
25 KiB
C++
//===--- FileManager.cpp - File System Probing and Caching ----------------===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file implements the FileManager interface.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// TODO: This should index all interesting directories with dirent calls.
|
|
// getdirentries ?
|
|
// opendir/readdir_r/closedir ?
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "clang/Basic/FileManager.h"
|
|
#include "clang/Basic/FileSystemStatCache.h"
|
|
#include "llvm/ADT/STLExtras.h"
|
|
#include "llvm/ADT/SmallString.h"
|
|
#include "llvm/ADT/Statistic.h"
|
|
#include "llvm/Config/llvm-config.h"
|
|
#include "llvm/Support/FileSystem.h"
|
|
#include "llvm/Support/MemoryBuffer.h"
|
|
#include "llvm/Support/Path.h"
|
|
#include "llvm/Support/raw_ostream.h"
|
|
#include <algorithm>
|
|
#include <cassert>
|
|
#include <climits>
|
|
#include <cstdint>
|
|
#include <cstdlib>
|
|
#include <string>
|
|
#include <utility>
|
|
|
|
using namespace clang;
|
|
|
|
#define DEBUG_TYPE "file-search"
|
|
|
|
ALWAYS_ENABLED_STATISTIC(NumDirLookups, "Number of directory lookups.");
|
|
ALWAYS_ENABLED_STATISTIC(NumFileLookups, "Number of file lookups.");
|
|
ALWAYS_ENABLED_STATISTIC(NumDirCacheMisses,
|
|
"Number of directory cache misses.");
|
|
ALWAYS_ENABLED_STATISTIC(NumFileCacheMisses, "Number of file cache misses.");
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Common logic.
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
FileManager::FileManager(const FileSystemOptions &FSO,
|
|
IntrusiveRefCntPtr<llvm::vfs::FileSystem> FS)
|
|
: FS(std::move(FS)), FileSystemOpts(FSO), SeenDirEntries(64),
|
|
SeenFileEntries(64), NextFileUID(0) {
|
|
// If the caller doesn't provide a virtual file system, just grab the real
|
|
// file system.
|
|
if (!this->FS)
|
|
this->FS = llvm::vfs::getRealFileSystem();
|
|
}
|
|
|
|
FileManager::~FileManager() = default;
|
|
|
|
void FileManager::setStatCache(std::unique_ptr<FileSystemStatCache> statCache) {
|
|
assert(statCache && "No stat cache provided?");
|
|
StatCache = std::move(statCache);
|
|
}
|
|
|
|
void FileManager::clearStatCache() { StatCache.reset(); }
|
|
|
|
/// Retrieve the directory that the given file name resides in.
|
|
/// Filename can point to either a real file or a virtual file.
|
|
static llvm::Expected<DirectoryEntryRef>
|
|
getDirectoryFromFile(FileManager &FileMgr, StringRef Filename,
|
|
bool CacheFailure) {
|
|
if (Filename.empty())
|
|
return llvm::errorCodeToError(
|
|
make_error_code(std::errc::no_such_file_or_directory));
|
|
|
|
if (llvm::sys::path::is_separator(Filename[Filename.size() - 1]))
|
|
return llvm::errorCodeToError(make_error_code(std::errc::is_a_directory));
|
|
|
|
StringRef DirName = llvm::sys::path::parent_path(Filename);
|
|
// Use the current directory if file has no path component.
|
|
if (DirName.empty())
|
|
DirName = ".";
|
|
|
|
return FileMgr.getDirectoryRef(DirName, CacheFailure);
|
|
}
|
|
|
|
/// Add all ancestors of the given path (pointing to either a file or
|
|
/// a directory) as virtual directories.
|
|
void FileManager::addAncestorsAsVirtualDirs(StringRef Path) {
|
|
StringRef DirName = llvm::sys::path::parent_path(Path);
|
|
if (DirName.empty())
|
|
DirName = ".";
|
|
|
|
auto &NamedDirEnt = *SeenDirEntries.insert(
|
|
{DirName, std::errc::no_such_file_or_directory}).first;
|
|
|
|
// When caching a virtual directory, we always cache its ancestors
|
|
// at the same time. Therefore, if DirName is already in the cache,
|
|
// we don't need to recurse as its ancestors must also already be in
|
|
// the cache (or it's a known non-virtual directory).
|
|
if (NamedDirEnt.second)
|
|
return;
|
|
|
|
// Add the virtual directory to the cache.
|
|
auto UDE = std::make_unique<DirectoryEntry>();
|
|
UDE->Name = NamedDirEnt.first();
|
|
NamedDirEnt.second = *UDE.get();
|
|
VirtualDirectoryEntries.push_back(std::move(UDE));
|
|
|
|
// Recursively add the other ancestors.
|
|
addAncestorsAsVirtualDirs(DirName);
|
|
}
|
|
|
|
llvm::Expected<DirectoryEntryRef>
|
|
FileManager::getDirectoryRef(StringRef DirName, bool CacheFailure) {
|
|
// stat doesn't like trailing separators except for root directory.
|
|
// At least, on Win32 MSVCRT, stat() cannot strip trailing '/'.
|
|
// (though it can strip '\\')
|
|
if (DirName.size() > 1 &&
|
|
DirName != llvm::sys::path::root_path(DirName) &&
|
|
llvm::sys::path::is_separator(DirName.back()))
|
|
DirName = DirName.substr(0, DirName.size()-1);
|
|
#ifdef _WIN32
|
|
// Fixing a problem with "clang C:test.c" on Windows.
|
|
// Stat("C:") does not recognize "C:" as a valid directory
|
|
std::string DirNameStr;
|
|
if (DirName.size() > 1 && DirName.back() == ':' &&
|
|
DirName.equals_insensitive(llvm::sys::path::root_name(DirName))) {
|
|
DirNameStr = DirName.str() + '.';
|
|
DirName = DirNameStr;
|
|
}
|
|
#endif
|
|
|
|
++NumDirLookups;
|
|
|
|
// See if there was already an entry in the map. Note that the map
|
|
// contains both virtual and real directories.
|
|
auto SeenDirInsertResult =
|
|
SeenDirEntries.insert({DirName, std::errc::no_such_file_or_directory});
|
|
if (!SeenDirInsertResult.second) {
|
|
if (SeenDirInsertResult.first->second)
|
|
return DirectoryEntryRef(*SeenDirInsertResult.first);
|
|
return llvm::errorCodeToError(SeenDirInsertResult.first->second.getError());
|
|
}
|
|
|
|
// We've not seen this before. Fill it in.
|
|
++NumDirCacheMisses;
|
|
auto &NamedDirEnt = *SeenDirInsertResult.first;
|
|
assert(!NamedDirEnt.second && "should be newly-created");
|
|
|
|
// Get the null-terminated directory name as stored as the key of the
|
|
// SeenDirEntries map.
|
|
StringRef InterndDirName = NamedDirEnt.first();
|
|
|
|
// Check to see if the directory exists.
|
|
llvm::vfs::Status Status;
|
|
auto statError = getStatValue(InterndDirName, Status, false,
|
|
nullptr /*directory lookup*/);
|
|
if (statError) {
|
|
// There's no real directory at the given path.
|
|
if (CacheFailure)
|
|
NamedDirEnt.second = statError;
|
|
else
|
|
SeenDirEntries.erase(DirName);
|
|
return llvm::errorCodeToError(statError);
|
|
}
|
|
|
|
// It exists. See if we have already opened a directory with the
|
|
// same inode (this occurs on Unix-like systems when one dir is
|
|
// symlinked to another, for example) or the same path (on
|
|
// Windows).
|
|
DirectoryEntry &UDE = UniqueRealDirs[Status.getUniqueID()];
|
|
|
|
NamedDirEnt.second = UDE;
|
|
if (UDE.getName().empty()) {
|
|
// We don't have this directory yet, add it. We use the string
|
|
// key from the SeenDirEntries map as the string.
|
|
UDE.Name = InterndDirName;
|
|
}
|
|
|
|
return DirectoryEntryRef(NamedDirEnt);
|
|
}
|
|
|
|
llvm::ErrorOr<const DirectoryEntry *>
|
|
FileManager::getDirectory(StringRef DirName, bool CacheFailure) {
|
|
auto Result = getDirectoryRef(DirName, CacheFailure);
|
|
if (Result)
|
|
return &Result->getDirEntry();
|
|
return llvm::errorToErrorCode(Result.takeError());
|
|
}
|
|
|
|
llvm::ErrorOr<const FileEntry *>
|
|
FileManager::getFile(StringRef Filename, bool openFile, bool CacheFailure) {
|
|
auto Result = getFileRef(Filename, openFile, CacheFailure);
|
|
if (Result)
|
|
return &Result->getFileEntry();
|
|
return llvm::errorToErrorCode(Result.takeError());
|
|
}
|
|
|
|
llvm::Expected<FileEntryRef>
|
|
FileManager::getFileRef(StringRef Filename, bool openFile, bool CacheFailure) {
|
|
++NumFileLookups;
|
|
|
|
// See if there is already an entry in the map.
|
|
auto SeenFileInsertResult =
|
|
SeenFileEntries.insert({Filename, std::errc::no_such_file_or_directory});
|
|
if (!SeenFileInsertResult.second) {
|
|
if (!SeenFileInsertResult.first->second)
|
|
return llvm::errorCodeToError(
|
|
SeenFileInsertResult.first->second.getError());
|
|
// Construct and return and FileEntryRef, unless it's a redirect to another
|
|
// filename.
|
|
FileEntryRef::MapValue Value = *SeenFileInsertResult.first->second;
|
|
if (LLVM_LIKELY(Value.V.is<FileEntry *>()))
|
|
return FileEntryRef(*SeenFileInsertResult.first);
|
|
return FileEntryRef(*reinterpret_cast<const FileEntryRef::MapEntry *>(
|
|
Value.V.get<const void *>()));
|
|
}
|
|
|
|
// We've not seen this before. Fill it in.
|
|
++NumFileCacheMisses;
|
|
auto *NamedFileEnt = &*SeenFileInsertResult.first;
|
|
assert(!NamedFileEnt->second && "should be newly-created");
|
|
|
|
// Get the null-terminated file name as stored as the key of the
|
|
// SeenFileEntries map.
|
|
StringRef InterndFileName = NamedFileEnt->first();
|
|
|
|
// Look up the directory for the file. When looking up something like
|
|
// sys/foo.h we'll discover all of the search directories that have a 'sys'
|
|
// subdirectory. This will let us avoid having to waste time on known-to-fail
|
|
// searches when we go to find sys/bar.h, because all the search directories
|
|
// without a 'sys' subdir will get a cached failure result.
|
|
auto DirInfoOrErr = getDirectoryFromFile(*this, Filename, CacheFailure);
|
|
if (!DirInfoOrErr) { // Directory doesn't exist, file can't exist.
|
|
std::error_code Err = errorToErrorCode(DirInfoOrErr.takeError());
|
|
if (CacheFailure)
|
|
NamedFileEnt->second = Err;
|
|
else
|
|
SeenFileEntries.erase(Filename);
|
|
|
|
return llvm::errorCodeToError(Err);
|
|
}
|
|
DirectoryEntryRef DirInfo = *DirInfoOrErr;
|
|
|
|
// FIXME: Use the directory info to prune this, before doing the stat syscall.
|
|
// FIXME: This will reduce the # syscalls.
|
|
|
|
// Check to see if the file exists.
|
|
std::unique_ptr<llvm::vfs::File> F;
|
|
llvm::vfs::Status Status;
|
|
auto statError = getStatValue(InterndFileName, Status, true,
|
|
openFile ? &F : nullptr);
|
|
if (statError) {
|
|
// There's no real file at the given path.
|
|
if (CacheFailure)
|
|
NamedFileEnt->second = statError;
|
|
else
|
|
SeenFileEntries.erase(Filename);
|
|
|
|
return llvm::errorCodeToError(statError);
|
|
}
|
|
|
|
assert((openFile || !F) && "undesired open file");
|
|
|
|
// It exists. See if we have already opened a file with the same inode.
|
|
// This occurs when one dir is symlinked to another, for example.
|
|
FileEntry &UFE = UniqueRealFiles[Status.getUniqueID()];
|
|
|
|
if (Status.getName() == Filename) {
|
|
// The name matches. Set the FileEntry.
|
|
NamedFileEnt->second = FileEntryRef::MapValue(UFE, DirInfo);
|
|
} else {
|
|
// Name mismatch. We need a redirect. First grab the actual entry we want
|
|
// to return.
|
|
//
|
|
// This redirection logic intentionally leaks the external name of a
|
|
// redirected file that uses 'use-external-name' in \a
|
|
// vfs::RedirectionFileSystem. This allows clang to report the external
|
|
// name to users (in diagnostics) and to tools that don't have access to
|
|
// the VFS (in debug info and dependency '.d' files).
|
|
//
|
|
// FIXME: This is pretty complicated. It's also inconsistent with how
|
|
// "real" filesystems behave and confuses parts of clang expect to see the
|
|
// name-as-accessed on the \a FileEntryRef. Maybe the returned \a
|
|
// FileEntryRef::getName() could return the accessed name unmodified, but
|
|
// make the external name available via a separate API.
|
|
auto &Redirection =
|
|
*SeenFileEntries
|
|
.insert({Status.getName(), FileEntryRef::MapValue(UFE, DirInfo)})
|
|
.first;
|
|
assert(Redirection.second->V.is<FileEntry *>() &&
|
|
"filename redirected to a non-canonical filename?");
|
|
assert(Redirection.second->V.get<FileEntry *>() == &UFE &&
|
|
"filename from getStatValue() refers to wrong file");
|
|
|
|
// Cache the redirection in the previously-inserted entry, still available
|
|
// in the tentative return value.
|
|
NamedFileEnt->second = FileEntryRef::MapValue(Redirection);
|
|
|
|
// Fix the tentative return value.
|
|
NamedFileEnt = &Redirection;
|
|
}
|
|
|
|
FileEntryRef ReturnedRef(*NamedFileEnt);
|
|
if (UFE.isValid()) { // Already have an entry with this inode, return it.
|
|
|
|
// FIXME: this hack ensures that if we look up a file by a virtual path in
|
|
// the VFS that the getDir() will have the virtual path, even if we found
|
|
// the file by a 'real' path first. This is required in order to find a
|
|
// module's structure when its headers/module map are mapped in the VFS.
|
|
// We should remove this as soon as we can properly support a file having
|
|
// multiple names.
|
|
if (&DirInfo.getDirEntry() != UFE.Dir && Status.IsVFSMapped)
|
|
UFE.Dir = &DirInfo.getDirEntry();
|
|
|
|
// Always update LastRef to the last name by which a file was accessed.
|
|
// FIXME: Neither this nor always using the first reference is correct; we
|
|
// want to switch towards a design where we return a FileName object that
|
|
// encapsulates both the name by which the file was accessed and the
|
|
// corresponding FileEntry.
|
|
// FIXME: LastRef should be removed from FileEntry once all clients adopt
|
|
// FileEntryRef.
|
|
UFE.LastRef = ReturnedRef;
|
|
|
|
return ReturnedRef;
|
|
}
|
|
|
|
// Otherwise, we don't have this file yet, add it.
|
|
UFE.LastRef = ReturnedRef;
|
|
UFE.Size = Status.getSize();
|
|
UFE.ModTime = llvm::sys::toTimeT(Status.getLastModificationTime());
|
|
UFE.Dir = &DirInfo.getDirEntry();
|
|
UFE.UID = NextFileUID++;
|
|
UFE.UniqueID = Status.getUniqueID();
|
|
UFE.IsNamedPipe = Status.getType() == llvm::sys::fs::file_type::fifo_file;
|
|
UFE.File = std::move(F);
|
|
UFE.IsValid = true;
|
|
|
|
if (UFE.File) {
|
|
if (auto PathName = UFE.File->getName())
|
|
fillRealPathName(&UFE, *PathName);
|
|
} else if (!openFile) {
|
|
// We should still fill the path even if we aren't opening the file.
|
|
fillRealPathName(&UFE, InterndFileName);
|
|
}
|
|
return ReturnedRef;
|
|
}
|
|
|
|
llvm::Expected<FileEntryRef> FileManager::getSTDIN() {
|
|
// Only read stdin once.
|
|
if (STDIN)
|
|
return *STDIN;
|
|
|
|
std::unique_ptr<llvm::MemoryBuffer> Content;
|
|
if (auto ContentOrError = llvm::MemoryBuffer::getSTDIN())
|
|
Content = std::move(*ContentOrError);
|
|
else
|
|
return llvm::errorCodeToError(ContentOrError.getError());
|
|
|
|
STDIN = getVirtualFileRef(Content->getBufferIdentifier(),
|
|
Content->getBufferSize(), 0);
|
|
FileEntry &FE = const_cast<FileEntry &>(STDIN->getFileEntry());
|
|
FE.Content = std::move(Content);
|
|
FE.IsNamedPipe = true;
|
|
return *STDIN;
|
|
}
|
|
|
|
const FileEntry *FileManager::getVirtualFile(StringRef Filename, off_t Size,
|
|
time_t ModificationTime) {
|
|
return &getVirtualFileRef(Filename, Size, ModificationTime).getFileEntry();
|
|
}
|
|
|
|
FileEntryRef FileManager::getVirtualFileRef(StringRef Filename, off_t Size,
|
|
time_t ModificationTime) {
|
|
++NumFileLookups;
|
|
|
|
// See if there is already an entry in the map for an existing file.
|
|
auto &NamedFileEnt = *SeenFileEntries.insert(
|
|
{Filename, std::errc::no_such_file_or_directory}).first;
|
|
if (NamedFileEnt.second) {
|
|
FileEntryRef::MapValue Value = *NamedFileEnt.second;
|
|
if (LLVM_LIKELY(Value.V.is<FileEntry *>()))
|
|
return FileEntryRef(NamedFileEnt);
|
|
return FileEntryRef(*reinterpret_cast<const FileEntryRef::MapEntry *>(
|
|
Value.V.get<const void *>()));
|
|
}
|
|
|
|
// We've not seen this before, or the file is cached as non-existent.
|
|
++NumFileCacheMisses;
|
|
addAncestorsAsVirtualDirs(Filename);
|
|
FileEntry *UFE = nullptr;
|
|
|
|
// Now that all ancestors of Filename are in the cache, the
|
|
// following call is guaranteed to find the DirectoryEntry from the
|
|
// cache. A virtual file can also have an empty filename, that could come
|
|
// from a source location preprocessor directive with an empty filename as
|
|
// an example, so we need to pretend it has a name to ensure a valid directory
|
|
// entry can be returned.
|
|
auto DirInfo = expectedToOptional(getDirectoryFromFile(
|
|
*this, Filename.empty() ? "." : Filename, /*CacheFailure=*/true));
|
|
assert(DirInfo &&
|
|
"The directory of a virtual file should already be in the cache.");
|
|
|
|
// Check to see if the file exists. If so, drop the virtual file
|
|
llvm::vfs::Status Status;
|
|
const char *InterndFileName = NamedFileEnt.first().data();
|
|
if (!getStatValue(InterndFileName, Status, true, nullptr)) {
|
|
UFE = &UniqueRealFiles[Status.getUniqueID()];
|
|
Status = llvm::vfs::Status(
|
|
Status.getName(), Status.getUniqueID(),
|
|
llvm::sys::toTimePoint(ModificationTime),
|
|
Status.getUser(), Status.getGroup(), Size,
|
|
Status.getType(), Status.getPermissions());
|
|
|
|
NamedFileEnt.second = FileEntryRef::MapValue(*UFE, *DirInfo);
|
|
|
|
// If we had already opened this file, close it now so we don't
|
|
// leak the descriptor. We're not going to use the file
|
|
// descriptor anyway, since this is a virtual file.
|
|
if (UFE->File)
|
|
UFE->closeFile();
|
|
|
|
// If we already have an entry with this inode, return it.
|
|
//
|
|
// FIXME: Surely this should add a reference by the new name, and return
|
|
// it instead...
|
|
if (UFE->isValid())
|
|
return FileEntryRef(NamedFileEnt);
|
|
|
|
UFE->UniqueID = Status.getUniqueID();
|
|
UFE->IsNamedPipe = Status.getType() == llvm::sys::fs::file_type::fifo_file;
|
|
fillRealPathName(UFE, Status.getName());
|
|
} else {
|
|
VirtualFileEntries.push_back(std::make_unique<FileEntry>());
|
|
UFE = VirtualFileEntries.back().get();
|
|
NamedFileEnt.second = FileEntryRef::MapValue(*UFE, *DirInfo);
|
|
}
|
|
|
|
UFE->LastRef = FileEntryRef(NamedFileEnt);
|
|
UFE->Size = Size;
|
|
UFE->ModTime = ModificationTime;
|
|
UFE->Dir = &DirInfo->getDirEntry();
|
|
UFE->UID = NextFileUID++;
|
|
UFE->IsValid = true;
|
|
UFE->File.reset();
|
|
return FileEntryRef(NamedFileEnt);
|
|
}
|
|
|
|
llvm::Optional<FileEntryRef> FileManager::getBypassFile(FileEntryRef VF) {
|
|
// Stat of the file and return nullptr if it doesn't exist.
|
|
llvm::vfs::Status Status;
|
|
if (getStatValue(VF.getName(), Status, /*isFile=*/true, /*F=*/nullptr))
|
|
return None;
|
|
|
|
if (!SeenBypassFileEntries)
|
|
SeenBypassFileEntries = std::make_unique<
|
|
llvm::StringMap<llvm::ErrorOr<FileEntryRef::MapValue>>>();
|
|
|
|
// If we've already bypassed just use the existing one.
|
|
auto Insertion = SeenBypassFileEntries->insert(
|
|
{VF.getName(), std::errc::no_such_file_or_directory});
|
|
if (!Insertion.second)
|
|
return FileEntryRef(*Insertion.first);
|
|
|
|
// Fill in the new entry from the stat.
|
|
BypassFileEntries.push_back(std::make_unique<FileEntry>());
|
|
const FileEntry &VFE = VF.getFileEntry();
|
|
FileEntry &BFE = *BypassFileEntries.back();
|
|
Insertion.first->second = FileEntryRef::MapValue(BFE, VF.getDir());
|
|
BFE.LastRef = FileEntryRef(*Insertion.first);
|
|
BFE.Size = Status.getSize();
|
|
BFE.Dir = VFE.Dir;
|
|
BFE.ModTime = llvm::sys::toTimeT(Status.getLastModificationTime());
|
|
BFE.UID = NextFileUID++;
|
|
BFE.IsValid = true;
|
|
|
|
// Save the entry in the bypass table and return.
|
|
return FileEntryRef(*Insertion.first);
|
|
}
|
|
|
|
bool FileManager::FixupRelativePath(SmallVectorImpl<char> &path) const {
|
|
StringRef pathRef(path.data(), path.size());
|
|
|
|
if (FileSystemOpts.WorkingDir.empty()
|
|
|| llvm::sys::path::is_absolute(pathRef))
|
|
return false;
|
|
|
|
SmallString<128> NewPath(FileSystemOpts.WorkingDir);
|
|
llvm::sys::path::append(NewPath, pathRef);
|
|
path = NewPath;
|
|
return true;
|
|
}
|
|
|
|
bool FileManager::makeAbsolutePath(SmallVectorImpl<char> &Path) const {
|
|
bool Changed = FixupRelativePath(Path);
|
|
|
|
if (!llvm::sys::path::is_absolute(StringRef(Path.data(), Path.size()))) {
|
|
FS->makeAbsolute(Path);
|
|
Changed = true;
|
|
}
|
|
|
|
return Changed;
|
|
}
|
|
|
|
void FileManager::fillRealPathName(FileEntry *UFE, llvm::StringRef FileName) {
|
|
llvm::SmallString<128> AbsPath(FileName);
|
|
// This is not the same as `VFS::getRealPath()`, which resolves symlinks
|
|
// but can be very expensive on real file systems.
|
|
// FIXME: the semantic of RealPathName is unclear, and the name might be
|
|
// misleading. We need to clean up the interface here.
|
|
makeAbsolutePath(AbsPath);
|
|
llvm::sys::path::remove_dots(AbsPath, /*remove_dot_dot=*/true);
|
|
UFE->RealPathName = std::string(AbsPath.str());
|
|
}
|
|
|
|
llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>>
|
|
FileManager::getBufferForFile(const FileEntry *Entry, bool isVolatile,
|
|
bool RequiresNullTerminator) {
|
|
// If the content is living on the file entry, return a reference to it.
|
|
if (Entry->Content)
|
|
return llvm::MemoryBuffer::getMemBuffer(Entry->Content->getMemBufferRef());
|
|
|
|
uint64_t FileSize = Entry->getSize();
|
|
// If there's a high enough chance that the file have changed since we
|
|
// got its size, force a stat before opening it.
|
|
if (isVolatile || Entry->isNamedPipe())
|
|
FileSize = -1;
|
|
|
|
StringRef Filename = Entry->getName();
|
|
// If the file is already open, use the open file descriptor.
|
|
if (Entry->File) {
|
|
auto Result = Entry->File->getBuffer(Filename, FileSize,
|
|
RequiresNullTerminator, isVolatile);
|
|
Entry->closeFile();
|
|
return Result;
|
|
}
|
|
|
|
// Otherwise, open the file.
|
|
return getBufferForFileImpl(Filename, FileSize, isVolatile,
|
|
RequiresNullTerminator);
|
|
}
|
|
|
|
llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>>
|
|
FileManager::getBufferForFileImpl(StringRef Filename, int64_t FileSize,
|
|
bool isVolatile,
|
|
bool RequiresNullTerminator) {
|
|
if (FileSystemOpts.WorkingDir.empty())
|
|
return FS->getBufferForFile(Filename, FileSize, RequiresNullTerminator,
|
|
isVolatile);
|
|
|
|
SmallString<128> FilePath(Filename);
|
|
FixupRelativePath(FilePath);
|
|
return FS->getBufferForFile(FilePath, FileSize, RequiresNullTerminator,
|
|
isVolatile);
|
|
}
|
|
|
|
/// getStatValue - Get the 'stat' information for the specified path,
|
|
/// using the cache to accelerate it if possible. This returns true
|
|
/// if the path points to a virtual file or does not exist, or returns
|
|
/// false if it's an existent real file. If FileDescriptor is NULL,
|
|
/// do directory look-up instead of file look-up.
|
|
std::error_code
|
|
FileManager::getStatValue(StringRef Path, llvm::vfs::Status &Status,
|
|
bool isFile, std::unique_ptr<llvm::vfs::File> *F) {
|
|
// FIXME: FileSystemOpts shouldn't be passed in here, all paths should be
|
|
// absolute!
|
|
if (FileSystemOpts.WorkingDir.empty())
|
|
return FileSystemStatCache::get(Path, Status, isFile, F,
|
|
StatCache.get(), *FS);
|
|
|
|
SmallString<128> FilePath(Path);
|
|
FixupRelativePath(FilePath);
|
|
|
|
return FileSystemStatCache::get(FilePath.c_str(), Status, isFile, F,
|
|
StatCache.get(), *FS);
|
|
}
|
|
|
|
std::error_code
|
|
FileManager::getNoncachedStatValue(StringRef Path,
|
|
llvm::vfs::Status &Result) {
|
|
SmallString<128> FilePath(Path);
|
|
FixupRelativePath(FilePath);
|
|
|
|
llvm::ErrorOr<llvm::vfs::Status> S = FS->status(FilePath.c_str());
|
|
if (!S)
|
|
return S.getError();
|
|
Result = *S;
|
|
return std::error_code();
|
|
}
|
|
|
|
void FileManager::GetUniqueIDMapping(
|
|
SmallVectorImpl<const FileEntry *> &UIDToFiles) const {
|
|
UIDToFiles.clear();
|
|
UIDToFiles.resize(NextFileUID);
|
|
|
|
// Map file entries
|
|
for (llvm::StringMap<llvm::ErrorOr<FileEntryRef::MapValue>,
|
|
llvm::BumpPtrAllocator>::const_iterator
|
|
FE = SeenFileEntries.begin(),
|
|
FEEnd = SeenFileEntries.end();
|
|
FE != FEEnd; ++FE)
|
|
if (llvm::ErrorOr<FileEntryRef::MapValue> Entry = FE->getValue()) {
|
|
if (const auto *FE = Entry->V.dyn_cast<FileEntry *>())
|
|
UIDToFiles[FE->getUID()] = FE;
|
|
}
|
|
|
|
// Map virtual file entries
|
|
for (const auto &VFE : VirtualFileEntries)
|
|
UIDToFiles[VFE->getUID()] = VFE.get();
|
|
}
|
|
|
|
StringRef FileManager::getCanonicalName(const DirectoryEntry *Dir) {
|
|
llvm::DenseMap<const void *, llvm::StringRef>::iterator Known
|
|
= CanonicalNames.find(Dir);
|
|
if (Known != CanonicalNames.end())
|
|
return Known->second;
|
|
|
|
StringRef CanonicalName(Dir->getName());
|
|
|
|
SmallString<4096> CanonicalNameBuf;
|
|
if (!FS->getRealPath(Dir->getName(), CanonicalNameBuf))
|
|
CanonicalName = CanonicalNameBuf.str().copy(CanonicalNameStorage);
|
|
|
|
CanonicalNames.insert({Dir, CanonicalName});
|
|
return CanonicalName;
|
|
}
|
|
|
|
StringRef FileManager::getCanonicalName(const FileEntry *File) {
|
|
llvm::DenseMap<const void *, llvm::StringRef>::iterator Known
|
|
= CanonicalNames.find(File);
|
|
if (Known != CanonicalNames.end())
|
|
return Known->second;
|
|
|
|
StringRef CanonicalName(File->getName());
|
|
|
|
SmallString<4096> CanonicalNameBuf;
|
|
if (!FS->getRealPath(File->getName(), CanonicalNameBuf))
|
|
CanonicalName = CanonicalNameBuf.str().copy(CanonicalNameStorage);
|
|
|
|
CanonicalNames.insert({File, CanonicalName});
|
|
return CanonicalName;
|
|
}
|
|
|
|
void FileManager::PrintStats() const {
|
|
llvm::errs() << "\n*** File Manager Stats:\n";
|
|
llvm::errs() << UniqueRealFiles.size() << " real files found, "
|
|
<< UniqueRealDirs.size() << " real dirs found.\n";
|
|
llvm::errs() << VirtualFileEntries.size() << " virtual files found, "
|
|
<< VirtualDirectoryEntries.size() << " virtual dirs found.\n";
|
|
llvm::errs() << NumDirLookups << " dir lookups, "
|
|
<< NumDirCacheMisses << " dir cache misses.\n";
|
|
llvm::errs() << NumFileLookups << " file lookups, "
|
|
<< NumFileCacheMisses << " file cache misses.\n";
|
|
|
|
//llvm::errs() << PagesMapped << BytesOfPagesMapped << FSLookups;
|
|
}
|