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54cc3c2f23
components. These sometimes get synthetically added, and we don't want -Ifoo and -I./foo to be treated fundamentally differently here. llvm-svn: 224055
588 lines
20 KiB
C++
588 lines
20 KiB
C++
//===--- FileManager.cpp - File System Probing and Caching ----------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the FileManager interface.
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//
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//===----------------------------------------------------------------------===//
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//
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// TODO: This should index all interesting directories with dirent calls.
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// getdirentries ?
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// opendir/readdir_r/closedir ?
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Basic/FileManager.h"
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#include "clang/Basic/FileSystemStatCache.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/Config/llvm-config.h"
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#include "llvm/Support/FileSystem.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/raw_ostream.h"
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#include <map>
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#include <set>
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#include <string>
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#include <system_error>
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using namespace clang;
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/// NON_EXISTENT_DIR - A special value distinct from null that is used to
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/// represent a dir name that doesn't exist on the disk.
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#define NON_EXISTENT_DIR reinterpret_cast<DirectoryEntry*>((intptr_t)-1)
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/// NON_EXISTENT_FILE - A special value distinct from null that is used to
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/// represent a filename that doesn't exist on the disk.
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#define NON_EXISTENT_FILE reinterpret_cast<FileEntry*>((intptr_t)-1)
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//===----------------------------------------------------------------------===//
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// Common logic.
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//===----------------------------------------------------------------------===//
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FileManager::FileManager(const FileSystemOptions &FSO,
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IntrusiveRefCntPtr<vfs::FileSystem> FS)
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: FS(FS), FileSystemOpts(FSO),
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SeenDirEntries(64), SeenFileEntries(64), NextFileUID(0) {
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NumDirLookups = NumFileLookups = 0;
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NumDirCacheMisses = NumFileCacheMisses = 0;
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// If the caller doesn't provide a virtual file system, just grab the real
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// file system.
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if (!FS)
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this->FS = vfs::getRealFileSystem();
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}
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FileManager::~FileManager() {
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for (unsigned i = 0, e = VirtualFileEntries.size(); i != e; ++i)
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delete VirtualFileEntries[i];
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for (unsigned i = 0, e = VirtualDirectoryEntries.size(); i != e; ++i)
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delete VirtualDirectoryEntries[i];
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}
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void FileManager::addStatCache(std::unique_ptr<FileSystemStatCache> statCache,
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bool AtBeginning) {
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assert(statCache && "No stat cache provided?");
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if (AtBeginning || !StatCache.get()) {
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statCache->setNextStatCache(std::move(StatCache));
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StatCache = std::move(statCache);
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return;
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}
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FileSystemStatCache *LastCache = StatCache.get();
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while (LastCache->getNextStatCache())
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LastCache = LastCache->getNextStatCache();
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LastCache->setNextStatCache(std::move(statCache));
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}
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void FileManager::removeStatCache(FileSystemStatCache *statCache) {
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if (!statCache)
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return;
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if (StatCache.get() == statCache) {
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// This is the first stat cache.
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StatCache = StatCache->takeNextStatCache();
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return;
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}
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// Find the stat cache in the list.
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FileSystemStatCache *PrevCache = StatCache.get();
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while (PrevCache && PrevCache->getNextStatCache() != statCache)
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PrevCache = PrevCache->getNextStatCache();
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assert(PrevCache && "Stat cache not found for removal");
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PrevCache->setNextStatCache(statCache->takeNextStatCache());
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}
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void FileManager::clearStatCaches() {
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StatCache.reset();
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}
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/// \brief Retrieve the directory that the given file name resides in.
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/// Filename can point to either a real file or a virtual file.
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static const DirectoryEntry *getDirectoryFromFile(FileManager &FileMgr,
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StringRef Filename,
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bool CacheFailure) {
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if (Filename.empty())
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return nullptr;
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if (llvm::sys::path::is_separator(Filename[Filename.size() - 1]))
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return nullptr; // If Filename is a directory.
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StringRef DirName = llvm::sys::path::parent_path(Filename);
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// Use the current directory if file has no path component.
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if (DirName.empty())
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DirName = ".";
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return FileMgr.getDirectory(DirName, CacheFailure);
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}
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/// Add all ancestors of the given path (pointing to either a file or
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/// a directory) as virtual directories.
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void FileManager::addAncestorsAsVirtualDirs(StringRef Path) {
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StringRef DirName = llvm::sys::path::parent_path(Path);
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if (DirName.empty())
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return;
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auto &NamedDirEnt =
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*SeenDirEntries.insert(std::make_pair(DirName, nullptr)).first;
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// When caching a virtual directory, we always cache its ancestors
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// at the same time. Therefore, if DirName is already in the cache,
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// we don't need to recurse as its ancestors must also already be in
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// the cache.
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if (NamedDirEnt.second)
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return;
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// Add the virtual directory to the cache.
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DirectoryEntry *UDE = new DirectoryEntry;
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UDE->Name = NamedDirEnt.first().data();
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NamedDirEnt.second = UDE;
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VirtualDirectoryEntries.push_back(UDE);
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// Recursively add the other ancestors.
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addAncestorsAsVirtualDirs(DirName);
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}
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const DirectoryEntry *FileManager::getDirectory(StringRef DirName,
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bool CacheFailure) {
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// stat doesn't like trailing separators except for root directory.
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// At least, on Win32 MSVCRT, stat() cannot strip trailing '/'.
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// (though it can strip '\\')
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if (DirName.size() > 1 &&
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DirName != llvm::sys::path::root_path(DirName) &&
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llvm::sys::path::is_separator(DirName.back()))
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DirName = DirName.substr(0, DirName.size()-1);
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#ifdef LLVM_ON_WIN32
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// Fixing a problem with "clang C:test.c" on Windows.
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// Stat("C:") does not recognize "C:" as a valid directory
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std::string DirNameStr;
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if (DirName.size() > 1 && DirName.back() == ':' &&
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DirName.equals_lower(llvm::sys::path::root_name(DirName))) {
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DirNameStr = DirName.str() + '.';
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DirName = DirNameStr;
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}
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#endif
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++NumDirLookups;
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auto &NamedDirEnt =
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*SeenDirEntries.insert(std::make_pair(DirName, nullptr)).first;
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// See if there was already an entry in the map. Note that the map
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// contains both virtual and real directories.
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if (NamedDirEnt.second)
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return NamedDirEnt.second == NON_EXISTENT_DIR ? nullptr
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: NamedDirEnt.second;
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++NumDirCacheMisses;
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// By default, initialize it to invalid.
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NamedDirEnt.second = NON_EXISTENT_DIR;
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// Get the null-terminated directory name as stored as the key of the
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// SeenDirEntries map.
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const char *InterndDirName = NamedDirEnt.first().data();
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// Check to see if the directory exists.
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FileData Data;
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if (getStatValue(InterndDirName, Data, false, nullptr /*directory lookup*/)) {
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// There's no real directory at the given path.
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if (!CacheFailure)
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SeenDirEntries.erase(DirName);
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return nullptr;
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}
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// It exists. See if we have already opened a directory with the
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// same inode (this occurs on Unix-like systems when one dir is
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// symlinked to another, for example) or the same path (on
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// Windows).
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DirectoryEntry &UDE = UniqueRealDirs[Data.UniqueID];
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NamedDirEnt.second = &UDE;
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if (!UDE.getName()) {
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// We don't have this directory yet, add it. We use the string
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// key from the SeenDirEntries map as the string.
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UDE.Name = InterndDirName;
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}
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return &UDE;
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}
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const FileEntry *FileManager::getFile(StringRef Filename, bool openFile,
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bool CacheFailure) {
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++NumFileLookups;
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// See if there is already an entry in the map.
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auto &NamedFileEnt =
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*SeenFileEntries.insert(std::make_pair(Filename, nullptr)).first;
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// See if there is already an entry in the map.
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if (NamedFileEnt.second)
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return NamedFileEnt.second == NON_EXISTENT_FILE ? nullptr
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: NamedFileEnt.second;
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++NumFileCacheMisses;
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// By default, initialize it to invalid.
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NamedFileEnt.second = NON_EXISTENT_FILE;
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// Get the null-terminated file name as stored as the key of the
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// SeenFileEntries map.
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const char *InterndFileName = NamedFileEnt.first().data();
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// Look up the directory for the file. When looking up something like
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// sys/foo.h we'll discover all of the search directories that have a 'sys'
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// subdirectory. This will let us avoid having to waste time on known-to-fail
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// searches when we go to find sys/bar.h, because all the search directories
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// without a 'sys' subdir will get a cached failure result.
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const DirectoryEntry *DirInfo = getDirectoryFromFile(*this, Filename,
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CacheFailure);
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if (DirInfo == nullptr) { // Directory doesn't exist, file can't exist.
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if (!CacheFailure)
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SeenFileEntries.erase(Filename);
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return nullptr;
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}
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// FIXME: Use the directory info to prune this, before doing the stat syscall.
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// FIXME: This will reduce the # syscalls.
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// Nope, there isn't. Check to see if the file exists.
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std::unique_ptr<vfs::File> F;
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FileData Data;
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if (getStatValue(InterndFileName, Data, true, openFile ? &F : nullptr)) {
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// There's no real file at the given path.
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if (!CacheFailure)
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SeenFileEntries.erase(Filename);
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return nullptr;
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}
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assert((openFile || !F) && "undesired open file");
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// It exists. See if we have already opened a file with the same inode.
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// This occurs when one dir is symlinked to another, for example.
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FileEntry &UFE = UniqueRealFiles[Data.UniqueID];
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NamedFileEnt.second = &UFE;
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// If the name returned by getStatValue is different than Filename, re-intern
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// the name.
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if (Data.Name != Filename) {
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auto &NamedFileEnt =
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*SeenFileEntries.insert(std::make_pair(Data.Name, nullptr)).first;
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if (!NamedFileEnt.second)
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NamedFileEnt.second = &UFE;
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else
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assert(NamedFileEnt.second == &UFE &&
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"filename from getStatValue() refers to wrong file");
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InterndFileName = NamedFileEnt.first().data();
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}
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if (UFE.isValid()) { // Already have an entry with this inode, return it.
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// FIXME: this hack ensures that if we look up a file by a virtual path in
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// the VFS that the getDir() will have the virtual path, even if we found
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// the file by a 'real' path first. This is required in order to find a
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// module's structure when its headers/module map are mapped in the VFS.
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// We should remove this as soon as we can properly support a file having
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// multiple names.
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if (DirInfo != UFE.Dir && Data.IsVFSMapped)
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UFE.Dir = DirInfo;
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// Always update the name to use the last name by which a file was accessed.
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// FIXME: Neither this nor always using the first name is correct; we want
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// to switch towards a design where we return a FileName object that
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// encapsulates both the name by which the file was accessed and the
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// corresponding FileEntry.
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UFE.Name = InterndFileName;
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return &UFE;
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}
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// Otherwise, we don't have this file yet, add it.
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UFE.Name = InterndFileName;
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UFE.Size = Data.Size;
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UFE.ModTime = Data.ModTime;
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UFE.Dir = DirInfo;
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UFE.UID = NextFileUID++;
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UFE.UniqueID = Data.UniqueID;
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UFE.IsNamedPipe = Data.IsNamedPipe;
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UFE.InPCH = Data.InPCH;
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UFE.File = std::move(F);
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UFE.IsValid = true;
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return &UFE;
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}
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const FileEntry *
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FileManager::getVirtualFile(StringRef Filename, off_t Size,
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time_t ModificationTime) {
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++NumFileLookups;
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// See if there is already an entry in the map.
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auto &NamedFileEnt =
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*SeenFileEntries.insert(std::make_pair(Filename, nullptr)).first;
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// See if there is already an entry in the map.
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if (NamedFileEnt.second && NamedFileEnt.second != NON_EXISTENT_FILE)
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return NamedFileEnt.second;
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++NumFileCacheMisses;
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// By default, initialize it to invalid.
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NamedFileEnt.second = NON_EXISTENT_FILE;
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addAncestorsAsVirtualDirs(Filename);
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FileEntry *UFE = nullptr;
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// Now that all ancestors of Filename are in the cache, the
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// following call is guaranteed to find the DirectoryEntry from the
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// cache.
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const DirectoryEntry *DirInfo = getDirectoryFromFile(*this, Filename,
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/*CacheFailure=*/true);
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assert(DirInfo &&
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"The directory of a virtual file should already be in the cache.");
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// Check to see if the file exists. If so, drop the virtual file
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FileData Data;
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const char *InterndFileName = NamedFileEnt.first().data();
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if (getStatValue(InterndFileName, Data, true, nullptr) == 0) {
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Data.Size = Size;
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Data.ModTime = ModificationTime;
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UFE = &UniqueRealFiles[Data.UniqueID];
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NamedFileEnt.second = UFE;
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// If we had already opened this file, close it now so we don't
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// leak the descriptor. We're not going to use the file
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// descriptor anyway, since this is a virtual file.
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if (UFE->File)
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UFE->closeFile();
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// If we already have an entry with this inode, return it.
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if (UFE->isValid())
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return UFE;
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UFE->UniqueID = Data.UniqueID;
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UFE->IsNamedPipe = Data.IsNamedPipe;
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UFE->InPCH = Data.InPCH;
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}
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if (!UFE) {
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UFE = new FileEntry();
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VirtualFileEntries.push_back(UFE);
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NamedFileEnt.second = UFE;
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}
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UFE->Name = InterndFileName;
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UFE->Size = Size;
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UFE->ModTime = ModificationTime;
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UFE->Dir = DirInfo;
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UFE->UID = NextFileUID++;
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UFE->File.reset();
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return UFE;
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}
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void FileManager::FixupRelativePath(SmallVectorImpl<char> &path) const {
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StringRef pathRef(path.data(), path.size());
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if (FileSystemOpts.WorkingDir.empty()
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|| llvm::sys::path::is_absolute(pathRef))
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return;
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SmallString<128> NewPath(FileSystemOpts.WorkingDir);
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llvm::sys::path::append(NewPath, pathRef);
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path = NewPath;
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}
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llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>>
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FileManager::getBufferForFile(const FileEntry *Entry, bool isVolatile,
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bool ShouldCloseOpenFile) {
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uint64_t FileSize = Entry->getSize();
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// If there's a high enough chance that the file have changed since we
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// got its size, force a stat before opening it.
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if (isVolatile)
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FileSize = -1;
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const char *Filename = Entry->getName();
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// If the file is already open, use the open file descriptor.
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if (Entry->File) {
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auto Result =
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Entry->File->getBuffer(Filename, FileSize,
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/*RequiresNullTerminator=*/true, isVolatile);
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// FIXME: we need a set of APIs that can make guarantees about whether a
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// FileEntry is open or not.
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if (ShouldCloseOpenFile)
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Entry->closeFile();
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return Result;
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}
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// Otherwise, open the file.
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if (FileSystemOpts.WorkingDir.empty())
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return FS->getBufferForFile(Filename, FileSize,
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/*RequiresNullTerminator=*/true, isVolatile);
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SmallString<128> FilePath(Entry->getName());
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FixupRelativePath(FilePath);
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return FS->getBufferForFile(FilePath.str(), FileSize,
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/*RequiresNullTerminator=*/true, isVolatile);
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}
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llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>>
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FileManager::getBufferForFile(StringRef Filename) {
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if (FileSystemOpts.WorkingDir.empty())
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return FS->getBufferForFile(Filename);
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SmallString<128> FilePath(Filename);
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FixupRelativePath(FilePath);
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return FS->getBufferForFile(FilePath.c_str());
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}
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/// getStatValue - Get the 'stat' information for the specified path,
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/// using the cache to accelerate it if possible. This returns true
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/// if the path points to a virtual file or does not exist, or returns
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/// false if it's an existent real file. If FileDescriptor is NULL,
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/// do directory look-up instead of file look-up.
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bool FileManager::getStatValue(const char *Path, FileData &Data, bool isFile,
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std::unique_ptr<vfs::File> *F) {
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// FIXME: FileSystemOpts shouldn't be passed in here, all paths should be
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// absolute!
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if (FileSystemOpts.WorkingDir.empty())
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return FileSystemStatCache::get(Path, Data, isFile, F,StatCache.get(), *FS);
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SmallString<128> FilePath(Path);
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FixupRelativePath(FilePath);
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return FileSystemStatCache::get(FilePath.c_str(), Data, isFile, F,
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StatCache.get(), *FS);
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}
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bool FileManager::getNoncachedStatValue(StringRef Path,
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vfs::Status &Result) {
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SmallString<128> FilePath(Path);
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FixupRelativePath(FilePath);
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llvm::ErrorOr<vfs::Status> S = FS->status(FilePath.c_str());
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if (!S)
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return true;
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Result = *S;
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return false;
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}
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void FileManager::invalidateCache(const FileEntry *Entry) {
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assert(Entry && "Cannot invalidate a NULL FileEntry");
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SeenFileEntries.erase(Entry->getName());
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// FileEntry invalidation should not block future optimizations in the file
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// caches. Possible alternatives are cache truncation (invalidate last N) or
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// invalidation of the whole cache.
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UniqueRealFiles.erase(Entry->getUniqueID());
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}
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void FileManager::GetUniqueIDMapping(
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SmallVectorImpl<const FileEntry *> &UIDToFiles) const {
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UIDToFiles.clear();
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UIDToFiles.resize(NextFileUID);
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// Map file entries
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for (llvm::StringMap<FileEntry*, llvm::BumpPtrAllocator>::const_iterator
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FE = SeenFileEntries.begin(), FEEnd = SeenFileEntries.end();
|
|
FE != FEEnd; ++FE)
|
|
if (FE->getValue() && FE->getValue() != NON_EXISTENT_FILE)
|
|
UIDToFiles[FE->getValue()->getUID()] = FE->getValue();
|
|
|
|
// Map virtual file entries
|
|
for (SmallVectorImpl<FileEntry *>::const_iterator
|
|
VFE = VirtualFileEntries.begin(), VFEEnd = VirtualFileEntries.end();
|
|
VFE != VFEEnd; ++VFE)
|
|
if (*VFE && *VFE != NON_EXISTENT_FILE)
|
|
UIDToFiles[(*VFE)->getUID()] = *VFE;
|
|
}
|
|
|
|
void FileManager::modifyFileEntry(FileEntry *File,
|
|
off_t Size, time_t ModificationTime) {
|
|
File->Size = Size;
|
|
File->ModTime = ModificationTime;
|
|
}
|
|
|
|
/// Remove '.' path components from the given absolute path.
|
|
/// \return \c true if any changes were made.
|
|
// FIXME: Move this to llvm::sys::path.
|
|
bool FileManager::removeDotPaths(SmallVectorImpl<char> &Path) {
|
|
using namespace llvm::sys;
|
|
|
|
SmallVector<StringRef, 16> ComponentStack;
|
|
StringRef P(Path.data(), Path.size());
|
|
|
|
// Skip the root path, then look for traversal in the components.
|
|
StringRef Rel = path::relative_path(P);
|
|
bool AnyDots = false;
|
|
for (StringRef C : llvm::make_range(path::begin(Rel), path::end(Rel))) {
|
|
if (C == ".") {
|
|
AnyDots = true;
|
|
continue;
|
|
}
|
|
ComponentStack.push_back(C);
|
|
}
|
|
|
|
if (!AnyDots)
|
|
return false;
|
|
|
|
SmallString<256> Buffer = path::root_path(P);
|
|
for (StringRef C : ComponentStack)
|
|
path::append(Buffer, C);
|
|
|
|
Path.swap(Buffer);
|
|
return true;
|
|
}
|
|
|
|
StringRef FileManager::getCanonicalName(const DirectoryEntry *Dir) {
|
|
// FIXME: use llvm::sys::fs::canonical() when it gets implemented
|
|
llvm::DenseMap<const DirectoryEntry *, llvm::StringRef>::iterator Known
|
|
= CanonicalDirNames.find(Dir);
|
|
if (Known != CanonicalDirNames.end())
|
|
return Known->second;
|
|
|
|
StringRef CanonicalName(Dir->getName());
|
|
|
|
#ifdef LLVM_ON_UNIX
|
|
char CanonicalNameBuf[PATH_MAX];
|
|
if (realpath(Dir->getName(), CanonicalNameBuf)) {
|
|
unsigned Len = strlen(CanonicalNameBuf);
|
|
char *Mem = static_cast<char *>(CanonicalNameStorage.Allocate(Len, 1));
|
|
memcpy(Mem, CanonicalNameBuf, Len);
|
|
CanonicalName = StringRef(Mem, Len);
|
|
}
|
|
#else
|
|
SmallString<256> CanonicalNameBuf(CanonicalName);
|
|
llvm::sys::fs::make_absolute(CanonicalNameBuf);
|
|
llvm::sys::path::native(CanonicalNameBuf);
|
|
removeDotPaths(CanonicalNameBuf);
|
|
#endif
|
|
|
|
CanonicalDirNames.insert(std::make_pair(Dir, 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;
|
|
}
|