forked from OSchip/llvm-project
601 lines
20 KiB
C++
601 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/Support/FileSystem.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Support/Path.h"
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#include "llvm/Support/system_error.h"
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#include "llvm/Config/llvm-config.h"
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#include <map>
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#include <set>
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#include <string>
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// FIXME: This is terrible, we need this for ::close.
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#if !defined(_MSC_VER) && !defined(__MINGW32__)
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#include <unistd.h>
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#include <sys/uio.h>
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#else
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#include <io.h>
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#endif
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using namespace clang;
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// FIXME: Enhance libsystem to support inode and other fields.
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#include <sys/stat.h>
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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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FileEntry::~FileEntry() {
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// If this FileEntry owns an open file descriptor that never got used, close
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// it.
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if (FD != -1) ::close(FD);
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}
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//===----------------------------------------------------------------------===//
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// Windows.
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//===----------------------------------------------------------------------===//
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#ifdef LLVM_ON_WIN32
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namespace {
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static std::string GetFullPath(const char *relPath) {
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char *absPathStrPtr = _fullpath(NULL, relPath, 0);
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assert(absPathStrPtr && "_fullpath() returned NULL!");
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std::string absPath(absPathStrPtr);
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free(absPathStrPtr);
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return absPath;
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}
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}
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class FileManager::UniqueDirContainer {
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/// UniqueDirs - Cache from full path to existing directories/files.
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///
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llvm::StringMap<DirectoryEntry> UniqueDirs;
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public:
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/// getDirectory - Return an existing DirectoryEntry with the given
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/// name if there is already one; otherwise create and return a
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/// default-constructed DirectoryEntry.
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DirectoryEntry &getDirectory(const char *Name,
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const struct stat & /*StatBuf*/) {
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std::string FullPath(GetFullPath(Name));
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return UniqueDirs.GetOrCreateValue(FullPath).getValue();
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}
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size_t size() const { return UniqueDirs.size(); }
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};
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class FileManager::UniqueFileContainer {
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/// UniqueFiles - Cache from full path to existing directories/files.
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///
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llvm::StringMap<FileEntry, llvm::BumpPtrAllocator> UniqueFiles;
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public:
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/// getFile - Return an existing FileEntry with the given name if
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/// there is already one; otherwise create and return a
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/// default-constructed FileEntry.
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FileEntry &getFile(const char *Name, const struct stat & /*StatBuf*/) {
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std::string FullPath(GetFullPath(Name));
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// Lowercase string because Windows filesystem is case insensitive.
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FullPath = StringRef(FullPath).lower();
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return UniqueFiles.GetOrCreateValue(FullPath).getValue();
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}
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size_t size() const { return UniqueFiles.size(); }
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};
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//===----------------------------------------------------------------------===//
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// Unix-like Systems.
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//===----------------------------------------------------------------------===//
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#else
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class FileManager::UniqueDirContainer {
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/// UniqueDirs - Cache from ID's to existing directories/files.
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std::map<std::pair<dev_t, ino_t>, DirectoryEntry> UniqueDirs;
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public:
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/// getDirectory - Return an existing DirectoryEntry with the given
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/// ID's if there is already one; otherwise create and return a
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/// default-constructed DirectoryEntry.
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DirectoryEntry &getDirectory(const char * /*Name*/,
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const struct stat &StatBuf) {
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return UniqueDirs[std::make_pair(StatBuf.st_dev, StatBuf.st_ino)];
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}
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size_t size() const { return UniqueDirs.size(); }
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};
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class FileManager::UniqueFileContainer {
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/// UniqueFiles - Cache from ID's to existing directories/files.
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std::set<FileEntry> UniqueFiles;
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public:
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/// getFile - Return an existing FileEntry with the given ID's if
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/// there is already one; otherwise create and return a
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/// default-constructed FileEntry.
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FileEntry &getFile(const char * /*Name*/, const struct stat &StatBuf) {
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return
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const_cast<FileEntry&>(
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*UniqueFiles.insert(FileEntry(StatBuf.st_dev,
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StatBuf.st_ino,
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StatBuf.st_mode)).first);
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}
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size_t size() const { return UniqueFiles.size(); }
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};
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#endif
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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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: FileSystemOpts(FSO),
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UniqueRealDirs(*new UniqueDirContainer()),
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UniqueRealFiles(*new UniqueFileContainer()),
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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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}
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FileManager::~FileManager() {
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delete &UniqueRealDirs;
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delete &UniqueRealFiles;
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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(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() == 0) {
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statCache->setNextStatCache(StatCache.take());
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StatCache.reset(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(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.reset(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->getNextStatCache());
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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 NULL;
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if (llvm::sys::path::is_separator(Filename[Filename.size() - 1]))
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return NULL; // 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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llvm::StringMapEntry<DirectoryEntry *> &NamedDirEnt =
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SeenDirEntries.GetOrCreateValue(DirName);
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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.getValue())
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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.getKeyData();
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NamedDirEnt.setValue(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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/// getDirectory - Lookup, cache, and verify the specified directory
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/// (real or virtual). This returns NULL if the directory doesn't
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/// exist.
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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.
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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 && llvm::sys::path::is_separator(DirName.back()))
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DirName = DirName.substr(0, DirName.size()-1);
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++NumDirLookups;
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llvm::StringMapEntry<DirectoryEntry *> &NamedDirEnt =
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SeenDirEntries.GetOrCreateValue(DirName);
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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.getValue())
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return NamedDirEnt.getValue() == NON_EXISTENT_DIR
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? 0 : NamedDirEnt.getValue();
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++NumDirCacheMisses;
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// By default, initialize it to invalid.
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NamedDirEnt.setValue(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.getKeyData();
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// Check to see if the directory exists.
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struct stat StatBuf;
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if (getStatValue(InterndDirName, StatBuf, 0/*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 0;
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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.getDirectory(InterndDirName, StatBuf);
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NamedDirEnt.setValue(&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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/// getFile - Lookup, cache, and verify the specified file (real or
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/// virtual). This returns NULL if the file doesn't exist.
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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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llvm::StringMapEntry<FileEntry *> &NamedFileEnt =
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SeenFileEntries.GetOrCreateValue(Filename);
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// See if there is already an entry in the map.
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if (NamedFileEnt.getValue())
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return NamedFileEnt.getValue() == NON_EXISTENT_FILE
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? 0 : NamedFileEnt.getValue();
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++NumFileCacheMisses;
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// By default, initialize it to invalid.
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NamedFileEnt.setValue(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.getKeyData();
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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 == 0) { // 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 0;
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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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int FileDescriptor = -1;
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struct stat StatBuf;
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if (getStatValue(InterndFileName, StatBuf, &FileDescriptor)) {
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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 0;
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}
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if (FileDescriptor != -1 && !openFile) {
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close(FileDescriptor);
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FileDescriptor = -1;
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}
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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.getFile(InterndFileName, StatBuf);
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NamedFileEnt.setValue(&UFE);
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if (UFE.getName()) { // Already have an entry with this inode, return it.
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// If the stat process opened the file, close it to avoid a FD leak.
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if (FileDescriptor != -1)
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close(FileDescriptor);
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return &UFE;
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}
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// Otherwise, we don't have this directory yet, add it.
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// FIXME: Change the name to be a char* that points back to the
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// 'SeenFileEntries' key.
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UFE.Name = InterndFileName;
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UFE.Size = StatBuf.st_size;
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UFE.ModTime = StatBuf.st_mtime;
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UFE.Dir = DirInfo;
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UFE.UID = NextFileUID++;
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UFE.FD = FileDescriptor;
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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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llvm::StringMapEntry<FileEntry *> &NamedFileEnt =
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SeenFileEntries.GetOrCreateValue(Filename);
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// See if there is already an entry in the map.
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if (NamedFileEnt.getValue() && NamedFileEnt.getValue() != NON_EXISTENT_FILE)
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return NamedFileEnt.getValue();
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++NumFileCacheMisses;
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// By default, initialize it to invalid.
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NamedFileEnt.setValue(NON_EXISTENT_FILE);
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addAncestorsAsVirtualDirs(Filename);
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FileEntry *UFE = 0;
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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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int FileDescriptor = -1;
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struct stat StatBuf;
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const char *InterndFileName = NamedFileEnt.getKeyData();
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if (getStatValue(InterndFileName, StatBuf, &FileDescriptor) == 0) {
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// If the stat process opened the file, close it to avoid a FD leak.
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if (FileDescriptor != -1)
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close(FileDescriptor);
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StatBuf.st_size = Size;
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StatBuf.st_mtime = ModificationTime;
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UFE = &UniqueRealFiles.getFile(InterndFileName, StatBuf);
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NamedFileEnt.setValue(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->FD != -1) {
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close(UFE->FD);
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UFE->FD = -1;
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}
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// If we already have an entry with this inode, return it.
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if (UFE->getName())
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return UFE;
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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.setValue(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->FD = -1;
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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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llvm::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::MemoryBuffer *FileManager::
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getBufferForFile(const FileEntry *Entry, std::string *ErrorStr) {
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llvm::OwningPtr<llvm::MemoryBuffer> Result;
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llvm::error_code ec;
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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->FD != -1) {
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ec = llvm::MemoryBuffer::getOpenFile(Entry->FD, Filename, Result,
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Entry->getSize());
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if (ErrorStr)
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*ErrorStr = ec.message();
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close(Entry->FD);
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Entry->FD = -1;
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return Result.take();
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}
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// Otherwise, open the file.
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if (FileSystemOpts.WorkingDir.empty()) {
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ec = llvm::MemoryBuffer::getFile(Filename, Result, Entry->getSize());
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if (ec && ErrorStr)
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*ErrorStr = ec.message();
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return Result.take();
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}
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llvm::SmallString<128> FilePath(Entry->getName());
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FixupRelativePath(FilePath);
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ec = llvm::MemoryBuffer::getFile(FilePath.str(), Result, Entry->getSize());
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if (ec && ErrorStr)
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*ErrorStr = ec.message();
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return Result.take();
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}
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llvm::MemoryBuffer *FileManager::
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getBufferForFile(StringRef Filename, std::string *ErrorStr) {
|
|
llvm::OwningPtr<llvm::MemoryBuffer> Result;
|
|
llvm::error_code ec;
|
|
if (FileSystemOpts.WorkingDir.empty()) {
|
|
ec = llvm::MemoryBuffer::getFile(Filename, Result);
|
|
if (ec && ErrorStr)
|
|
*ErrorStr = ec.message();
|
|
return Result.take();
|
|
}
|
|
|
|
llvm::SmallString<128> FilePath(Filename);
|
|
FixupRelativePath(FilePath);
|
|
ec = llvm::MemoryBuffer::getFile(FilePath.c_str(), Result);
|
|
if (ec && ErrorStr)
|
|
*ErrorStr = ec.message();
|
|
return Result.take();
|
|
}
|
|
|
|
/// 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.
|
|
bool FileManager::getStatValue(const char *Path, struct stat &StatBuf,
|
|
int *FileDescriptor) {
|
|
// FIXME: FileSystemOpts shouldn't be passed in here, all paths should be
|
|
// absolute!
|
|
if (FileSystemOpts.WorkingDir.empty())
|
|
return FileSystemStatCache::get(Path, StatBuf, FileDescriptor,
|
|
StatCache.get());
|
|
|
|
llvm::SmallString<128> FilePath(Path);
|
|
FixupRelativePath(FilePath);
|
|
|
|
return FileSystemStatCache::get(FilePath.c_str(), StatBuf, FileDescriptor,
|
|
StatCache.get());
|
|
}
|
|
|
|
bool FileManager::getNoncachedStatValue(StringRef Path,
|
|
struct stat &StatBuf) {
|
|
llvm::SmallString<128> FilePath(Path);
|
|
FixupRelativePath(FilePath);
|
|
|
|
return ::stat(FilePath.c_str(), &StatBuf) != 0;
|
|
}
|
|
|
|
void FileManager::GetUniqueIDMapping(
|
|
SmallVectorImpl<const FileEntry *> &UIDToFiles) const {
|
|
UIDToFiles.clear();
|
|
UIDToFiles.resize(NextFileUID);
|
|
|
|
// Map file entries
|
|
for (llvm::StringMap<FileEntry*, llvm::BumpPtrAllocator>::const_iterator
|
|
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 (SmallVector<FileEntry*, 4>::const_iterator
|
|
VFE = VirtualFileEntries.begin(), VFEEnd = VirtualFileEntries.end();
|
|
VFE != VFEEnd; ++VFE)
|
|
if (*VFE && *VFE != NON_EXISTENT_FILE)
|
|
UIDToFiles[(*VFE)->getUID()] = *VFE;
|
|
}
|
|
|
|
|
|
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;
|
|
}
|