[clang] NFC: Remove {File,Directory}Entry::getName() (#74910)

The files and directories that Clang accesses are uniqued by their
inode. For each inode `FileManager` will create exactly one `FileEntry`
or `DirectoryEntry` object, which makes answering the question _"Are
these two files/directories the same?"_ a simple pointer equality check.

However, since the same inode can be accessed through multiple different
paths, asking the `FileEntry` or `DirectoryEntry` object _"What is your
name?"_ doesn't have clear semantics. In c0ff990 we started reporting
the most recent name used to access the entry, which turned out to be
necessary for Clang modules. However, the long-term solution has always
been to explicitly track the as-requested name. This has been
implemented in 4dc5573 as `FileEntryRef` and `DirectoryEntryRef`.

The `DirectoryEntry::getName()` interface has been deprecated since the
Clang 17 release and `FileEntry::getName()` since Clang 18. We have
replaced uses of these deprecated APIs in `main` with
`DirectoryEntryRef::getName()` and `FileEntryRef::getName()`
respectively.

This makes it possible to remove `{File,Directory}Entry::getName()` for
good along with the `FileManager` code that implements them.

clang/include/clang/Basic/DirectoryEntry.h

@@ -41,13 +41,6 @@ class DirectoryEntry {
   DirectoryEntry &operator=(const DirectoryEntry &) = delete;
   friend class FileManager;
   friend class FileEntryTestHelper;
-
-  // FIXME: We should not be storing a directory entry name here.
-  StringRef Name; // Name of the directory.
-
-public:
-  LLVM_DEPRECATED("Use DirectoryEntryRef::getName() instead.", "")
-  StringRef getName() const { return Name; }
 };
 
 /// A reference to a \c DirectoryEntry  that includes the name of the directory

clang/include/clang/Basic/FileEntry.h

@@ -318,18 +318,8 @@ class FileEntry {
   /// The file content, if it is owned by the \p FileEntry.
   std::unique_ptr<llvm::MemoryBuffer> Content;
 
-  // First access name for this FileEntry.
-  //
-  // This is Optional only to allow delayed construction (FileEntryRef has no
-  // default constructor). It should always have a value in practice.
-  //
-  // TODO: remove this once everyone that needs a name uses FileEntryRef.
-  OptionalFileEntryRef LastRef;
-
 public:
   ~FileEntry();
-  LLVM_DEPRECATED("Use FileEntryRef::getName() instead.", "")
-  StringRef getName() const { return LastRef->getName(); }
 
   StringRef tryGetRealPathName() const { return RealPathName; }
   off_t getSize() const { return Size; }

clang/lib/Basic/FileManager.cpp

@@ -107,7 +107,6 @@ void FileManager::addAncestorsAsVirtualDirs(StringRef Path) {
 
   // Add the virtual directory to the cache.
   auto *UDE = new (DirsAlloc.Allocate()) DirectoryEntry();
-  UDE->Name = NamedDirEnt.first();
   NamedDirEnt.second = *UDE;
   VirtualDirectoryEntries.push_back(UDE);
 
@@ -179,7 +178,6 @@ FileManager::getDirectoryRef(StringRef DirName, bool CacheFailure) {
     // We don't have this directory yet, add it.  We use the string
     // key from the SeenDirEntries map as the string.
     UDE = new (DirsAlloc.Allocate()) DirectoryEntry();
-    UDE->Name = InterndDirName;
   }
   NamedDirEnt.second = *UDE;
 
@@ -324,32 +322,10 @@ FileManager::getFileRef(StringRef Filename, bool openFile, bool CacheFailure) {
 
   FileEntryRef ReturnedRef(*NamedFileEnt);
   if (ReusingEntry) { // Already have an entry with this inode, return it.
-
-    // FIXME: This hack ensures that `getDir()` will use the path that was
-    // used to lookup this file, even if we found a file by different path
-    // first. This is required in order to find a module's structure when its
-    // headers/module map are mapped in the VFS.
-    //
-    // See above for how this will eventually be removed. `IsVFSMapped`
-    // *cannot* be narrowed to `ExposesExternalVFSPath` as crash reproducers
-    // also depend on this logic and they have `use-external-paths: false`.
-    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();
@@ -461,7 +437,6 @@ FileEntryRef FileManager::getVirtualFileRef(StringRef Filename, off_t Size,
   }
 
   NamedFileEnt.second = FileEntryRef::MapValue(*UFE, *DirInfo);
-  UFE->LastRef = FileEntryRef(NamedFileEnt);
   UFE->Size    = Size;
   UFE->ModTime = ModificationTime;
   UFE->Dir     = &DirInfo->getDirEntry();
@@ -490,7 +465,6 @@ OptionalFileEntryRef FileManager::getBypassFile(FileEntryRef VF) {
   FileEntry *BFE = new (FilesAlloc.Allocate()) FileEntry();
   BypassFileEntries.push_back(BFE);
   Insertion.first->second = FileEntryRef::MapValue(*BFE, VF.getDir());
-  BFE->LastRef = FileEntryRef(*Insertion.first);
   BFE->Size = Status.getSize();
   BFE->Dir = VF.getFileEntry().Dir;
   BFE->ModTime = llvm::sys::toTimeT(Status.getLastModificationTime());

clang/unittests/Basic/FileManagerTest.cpp

@@ -284,9 +284,6 @@ TEST_F(FileManagerTest, getFileRefReturnsCorrectNameForDifferentStatPath) {
   ASSERT_FALSE(!F1Alias);
   ASSERT_FALSE(!F1Alias2);
   EXPECT_EQ("dir/f1.cpp", F1->getName());
-  LLVM_SUPPRESS_DEPRECATED_DECLARATIONS_PUSH
-  EXPECT_EQ("dir/f1.cpp", F1->getFileEntry().getName());
-  LLVM_SUPPRESS_DEPRECATED_DECLARATIONS_POP
   EXPECT_EQ("dir/f1.cpp", F1Alias->getName());
   EXPECT_EQ("dir/f1.cpp", F1Alias2->getName());
   EXPECT_EQ(&F1->getFileEntry(), &F1Alias->getFileEntry());
@@ -305,9 +302,6 @@ TEST_F(FileManagerTest, getFileRefReturnsCorrectNameForDifferentStatPath) {
   ASSERT_FALSE(!F2Alias);
   ASSERT_FALSE(!F2Alias2);
   EXPECT_EQ("dir/f2.cpp", F2->getName());
-  LLVM_SUPPRESS_DEPRECATED_DECLARATIONS_PUSH
-  EXPECT_EQ("dir/f2.cpp", F2->getFileEntry().getName());
-  LLVM_SUPPRESS_DEPRECATED_DECLARATIONS_POP
   EXPECT_EQ("dir/f2.cpp", F2Alias->getName());
   EXPECT_EQ("dir/f2.cpp", F2Alias2->getName());
   EXPECT_EQ(&F2->getFileEntry(), &F2Alias->getFileEntry());

llvm/include/llvm/Support/VirtualFileSystem.h

@@ -55,9 +55,6 @@ class Status {
   llvm::sys::fs::perms Perms;
 
 public:
-  // FIXME: remove when files support multiple names
-  bool IsVFSMapped = false;
-
   /// Whether this entity has an external path different from the virtual path,
   /// and the external path is exposed by leaking it through the abstraction.
   /// For example, a RedirectingFileSystem will set this for paths where

llvm/lib/Support/VirtualFileSystem.cpp

@@ -2334,7 +2334,6 @@ static Status getRedirectedFileStatus(const Twine &OriginalPath,
     S = Status::copyWithNewName(S, OriginalPath);
   else
     S.ExposesExternalVFSPath = true;
-  S.IsVFSMapped = true;
   return S;
 }
 

llvm/unittests/Support/VirtualFileSystemTest.cpp

@@ -1563,13 +1563,11 @@ TEST_F(VFSFromYAMLTest, MappedFiles) {
   ErrorOr<vfs::Status> S = O->status("//root/file1");
   ASSERT_FALSE(S.getError());
   EXPECT_EQ("//root/foo/bar/a", S->getName());
-  EXPECT_TRUE(S->IsVFSMapped);
   EXPECT_TRUE(S->ExposesExternalVFSPath);
 
   ErrorOr<vfs::Status> SLower = O->status("//root/foo/bar/a");
   EXPECT_EQ("//root/foo/bar/a", SLower->getName());
   EXPECT_TRUE(S->equivalent(*SLower));
-  EXPECT_FALSE(SLower->IsVFSMapped);
   EXPECT_FALSE(SLower->ExposesExternalVFSPath);
 
   // file after opening
@@ -1578,7 +1576,6 @@ TEST_F(VFSFromYAMLTest, MappedFiles) {
   auto OpenedS = (*OpenedF)->status();
   ASSERT_FALSE(OpenedS.getError());
   EXPECT_EQ("//root/foo/bar/a", OpenedS->getName());
-  EXPECT_TRUE(OpenedS->IsVFSMapped);
   EXPECT_TRUE(OpenedS->ExposesExternalVFSPath);
 
   // directory
@@ -1591,29 +1588,25 @@ TEST_F(VFSFromYAMLTest, MappedFiles) {
   S = O->status("//root/mappeddir");
   ASSERT_FALSE(S.getError());
   EXPECT_TRUE(S->isDirectory());
-  EXPECT_TRUE(S->IsVFSMapped);
   EXPECT_TRUE(S->ExposesExternalVFSPath);
   EXPECT_TRUE(S->equivalent(*O->status("//root/foo/bar")));
 
   SLower = O->status("//root/foo/bar");
   EXPECT_EQ("//root/foo/bar", SLower->getName());
   EXPECT_TRUE(S->equivalent(*SLower));
-  EXPECT_FALSE(SLower->IsVFSMapped);
   EXPECT_FALSE(SLower->ExposesExternalVFSPath);
 
   // file in remapped directory
   S = O->status("//root/mappeddir/a");
   ASSERT_FALSE(S.getError());
   EXPECT_FALSE(S->isDirectory());
-  EXPECT_TRUE(S->IsVFSMapped);
   EXPECT_TRUE(S->ExposesExternalVFSPath);
   EXPECT_EQ("//root/foo/bar/a", S->getName());
 
   // file in remapped directory, with use-external-name=false
   S = O->status("//root/mappeddir2/a");
   ASSERT_FALSE(S.getError());
   EXPECT_FALSE(S->isDirectory());
-  EXPECT_TRUE(S->IsVFSMapped);
   EXPECT_FALSE(S->ExposesExternalVFSPath);
   EXPECT_EQ("//root/mappeddir2/a", S->getName());
 
@@ -1623,7 +1616,6 @@ TEST_F(VFSFromYAMLTest, MappedFiles) {
   OpenedS = (*OpenedF)->status();
   ASSERT_FALSE(OpenedS.getError());
   EXPECT_EQ("//root/foo/bar/a", OpenedS->getName());
-  EXPECT_TRUE(OpenedS->IsVFSMapped);
   EXPECT_TRUE(OpenedS->ExposesExternalVFSPath);
 
   // file contents in remapped directory, with use-external-name=false
@@ -1632,7 +1624,6 @@ TEST_F(VFSFromYAMLTest, MappedFiles) {
   OpenedS = (*OpenedF)->status();
   ASSERT_FALSE(OpenedS.getError());
   EXPECT_EQ("//root/mappeddir2/a", OpenedS->getName());
-  EXPECT_TRUE(OpenedS->IsVFSMapped);
   EXPECT_FALSE(OpenedS->ExposesExternalVFSPath);
 
   // broken mapping
@@ -1665,13 +1656,11 @@ TEST_F(VFSFromYAMLTest, MappedRoot) {
   ErrorOr<vfs::Status> S = O->status("//mappedroot/a");
   ASSERT_FALSE(S.getError());
   EXPECT_EQ("//root/foo/bar/a", S->getName());
-  EXPECT_TRUE(S->IsVFSMapped);
   EXPECT_TRUE(S->ExposesExternalVFSPath);
 
   ErrorOr<vfs::Status> SLower = O->status("//root/foo/bar/a");
   EXPECT_EQ("//root/foo/bar/a", SLower->getName());
   EXPECT_TRUE(S->equivalent(*SLower));
-  EXPECT_FALSE(SLower->IsVFSMapped);
   EXPECT_FALSE(SLower->ExposesExternalVFSPath);
 
   // file after opening
@@ -1680,7 +1669,6 @@ TEST_F(VFSFromYAMLTest, MappedRoot) {
   auto OpenedS = (*OpenedF)->status();
   ASSERT_FALSE(OpenedS.getError());
   EXPECT_EQ("//root/foo/bar/a", OpenedS->getName());
-  EXPECT_TRUE(OpenedS->IsVFSMapped);
   EXPECT_TRUE(OpenedS->ExposesExternalVFSPath);
 
   EXPECT_EQ(0, NumDiagnostics);
@@ -1829,13 +1817,11 @@ TEST_F(VFSFromYAMLTest, ReturnsRequestedPathVFSMiss) {
   auto OpenedS = (*OpenedF)->status();
   ASSERT_FALSE(OpenedS.getError());
   EXPECT_EQ("a", OpenedS->getName());
-  EXPECT_FALSE(OpenedS->IsVFSMapped);
   EXPECT_FALSE(OpenedS->ExposesExternalVFSPath);
 
   auto DirectS = RemappedFS->status("a");
   ASSERT_FALSE(DirectS.getError());
   EXPECT_EQ("a", DirectS->getName());
-  EXPECT_FALSE(DirectS->IsVFSMapped);
   EXPECT_FALSE(DirectS->ExposesExternalVFSPath);
 
   EXPECT_EQ(0, NumDiagnostics);
@@ -1871,13 +1857,11 @@ TEST_F(VFSFromYAMLTest, ReturnsExternalPathVFSHit) {
   auto OpenedS = (*OpenedF)->status();
   ASSERT_FALSE(OpenedS.getError());
   EXPECT_EQ("realname", OpenedS->getName());
-  EXPECT_TRUE(OpenedS->IsVFSMapped);
   EXPECT_TRUE(OpenedS->ExposesExternalVFSPath);
 
   auto DirectS = FS->status("vfsname");
   ASSERT_FALSE(DirectS.getError());
   EXPECT_EQ("realname", DirectS->getName());
-  EXPECT_TRUE(DirectS->IsVFSMapped);
   EXPECT_TRUE(DirectS->ExposesExternalVFSPath);
 
   EXPECT_EQ(0, NumDiagnostics);
@@ -1976,13 +1960,11 @@ TEST_F(VFSFromYAMLTest, ReturnsInternalPathVFSHit) {
   auto OpenedS = (*OpenedF)->status();
   ASSERT_FALSE(OpenedS.getError());
   EXPECT_EQ("vfsname", OpenedS->getName());
-  EXPECT_TRUE(OpenedS->IsVFSMapped);
   EXPECT_FALSE(OpenedS->ExposesExternalVFSPath);
 
   auto DirectS = FS->status("vfsname");
   ASSERT_FALSE(DirectS.getError());
   EXPECT_EQ("vfsname", DirectS->getName());
-  EXPECT_TRUE(DirectS->IsVFSMapped);
   EXPECT_FALSE(DirectS->ExposesExternalVFSPath);
 
   EXPECT_EQ(0, NumDiagnostics);