1 files changed, 0 insertions, 2270 deletions

diff --git a/contrib/llvm/tools/clang/lib/Basic/SourceManager.cpp b/contrib/llvm/tools/clang/lib/Basic/SourceManager.cpp
deleted file mode 100644
index 12b0305e707c..000000000000
--- a/contrib/llvm/tools/clang/lib/Basic/SourceManager.cpp
+++ /dev/null
@@ -1,2270 +0,0 @@
-//===- SourceManager.cpp - Track and cache source files -------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-//
-//  This file implements the SourceManager interface.
-//
-//===----------------------------------------------------------------------===//
-
-#include "clang/Basic/SourceManager.h"
-#include "clang/Basic/Diagnostic.h"
-#include "clang/Basic/FileManager.h"
-#include "clang/Basic/LLVM.h"
-#include "clang/Basic/SourceLocation.h"
-#include "clang/Basic/SourceManagerInternals.h"
-#include "llvm/ADT/DenseMap.h"
-#include "llvm/ADT/Optional.h"
-#include "llvm/ADT/None.h"
-#include "llvm/ADT/STLExtras.h"
-#include "llvm/ADT/SmallVector.h"
-#include "llvm/ADT/StringSwitch.h"
-#include "llvm/ADT/StringRef.h"
-#include "llvm/Support/Allocator.h"
-#include "llvm/Support/Capacity.h"
-#include "llvm/Support/Compiler.h"
-#include "llvm/Support/ErrorHandling.h"
-#include "llvm/Support/FileSystem.h"
-#include "llvm/Support/MathExtras.h"
-#include "llvm/Support/MemoryBuffer.h"
-#include "llvm/Support/Path.h"
-#include "llvm/Support/raw_ostream.h"
-#include <algorithm>
-#include <cassert>
-#include <cstddef>
-#include <cstdint>
-#include <memory>
-#include <tuple>
-#include <utility>
-#include <vector>
-
-using namespace clang;
-using namespace SrcMgr;
-using llvm::MemoryBuffer;
-
-//===----------------------------------------------------------------------===//
-// SourceManager Helper Classes
-//===----------------------------------------------------------------------===//
-
-ContentCache::~ContentCache() {
-  if (shouldFreeBuffer())
-    delete Buffer.getPointer();
-}
-
-/// getSizeBytesMapped - Returns the number of bytes actually mapped for this
-/// ContentCache. This can be 0 if the MemBuffer was not actually expanded.
-unsigned ContentCache::getSizeBytesMapped() const {
-  return Buffer.getPointer() ? Buffer.getPointer()->getBufferSize() : 0;
-}
-
-/// Returns the kind of memory used to back the memory buffer for
-/// this content cache.  This is used for performance analysis.
-llvm::MemoryBuffer::BufferKind ContentCache::getMemoryBufferKind() const {
-  assert(Buffer.getPointer());
-
-  // Should be unreachable, but keep for sanity.
-  if (!Buffer.getPointer())
-    return llvm::MemoryBuffer::MemoryBuffer_Malloc;
-
-  const llvm::MemoryBuffer *buf = Buffer.getPointer();
-  return buf->getBufferKind();
-}
-
-/// getSize - Returns the size of the content encapsulated by this ContentCache.
-///  This can be the size of the source file or the size of an arbitrary
-///  scratch buffer.  If the ContentCache encapsulates a source file, that
-///  file is not lazily brought in from disk to satisfy this query.
-unsigned ContentCache::getSize() const {
-  return Buffer.getPointer() ? (unsigned) Buffer.getPointer()->getBufferSize()
-                             : (unsigned) ContentsEntry->getSize();
-}
-
-void ContentCache::replaceBuffer(const llvm::MemoryBuffer *B, bool DoNotFree) {
-  if (B && B == Buffer.getPointer()) {
-    assert(0 && "Replacing with the same buffer");
-    Buffer.setInt(DoNotFree? DoNotFreeFlag : 0);
-    return;
-  }
-
-  if (shouldFreeBuffer())
-    delete Buffer.getPointer();
-  Buffer.setPointer(B);
-  Buffer.setInt((B && DoNotFree) ? DoNotFreeFlag : 0);
-}
-
-const llvm::MemoryBuffer *ContentCache::getBuffer(DiagnosticsEngine &Diag,
-                                                  const SourceManager &SM,
-                                                  SourceLocation Loc,
-                                                  bool *Invalid) const {
-  // Lazily create the Buffer for ContentCaches that wrap files.  If we already
-  // computed it, just return what we have.
-  if (Buffer.getPointer() || !ContentsEntry) {
-    if (Invalid)
-      *Invalid = isBufferInvalid();
-
-    return Buffer.getPointer();
-  }
-
-  // Check that the file's size fits in an 'unsigned' (with room for a
-  // past-the-end value). This is deeply regrettable, but various parts of
-  // Clang (including elsewhere in this file!) use 'unsigned' to represent file
-  // offsets, line numbers, string literal lengths, and so on, and fail
-  // miserably on large source files.
-  if ((uint64_t)ContentsEntry->getSize() >=
-      std::numeric_limits<unsigned>::max()) {
-    // We can't make a memory buffer of the required size, so just make a small
-    // one. We should never hit a situation where we've already parsed to a
-    // later offset of the file, so it shouldn't matter that the buffer is
-    // smaller than the file.
-    Buffer.setPointer(
-        llvm::MemoryBuffer::getMemBuffer("", ContentsEntry->getName())
-            .release());
-    if (Diag.isDiagnosticInFlight())
-      Diag.SetDelayedDiagnostic(diag::err_file_too_large,
-                                ContentsEntry->getName());
-    else
-      Diag.Report(Loc, diag::err_file_too_large)
-        << ContentsEntry->getName();
-
-    Buffer.setInt(Buffer.getInt() | InvalidFlag);
-    if (Invalid) *Invalid = true;
-    return Buffer.getPointer();
-  }
-
-  bool isVolatile = SM.userFilesAreVolatile() && !IsSystemFile;
-  auto BufferOrError =
-      SM.getFileManager().getBufferForFile(ContentsEntry, isVolatile);
-
-  // If we were unable to open the file, then we are in an inconsistent
-  // situation where the content cache referenced a file which no longer
-  // exists. Most likely, we were using a stat cache with an invalid entry but
-  // the file could also have been removed during processing. Since we can't
-  // really deal with this situation, just create an empty buffer.
-  //
-  // FIXME: This is definitely not ideal, but our immediate clients can't
-  // currently handle returning a null entry here. Ideally we should detect
-  // that we are in an inconsistent situation and error out as quickly as
-  // possible.
-  if (!BufferOrError) {
-    StringRef FillStr("<<<MISSING SOURCE FILE>>>\n");
-    auto BackupBuffer = llvm::WritableMemoryBuffer::getNewUninitMemBuffer(
-        ContentsEntry->getSize(), "<invalid>");
-    char *Ptr = BackupBuffer->getBufferStart();
-    for (unsigned i = 0, e = ContentsEntry->getSize(); i != e; ++i)
-      Ptr[i] = FillStr[i % FillStr.size()];
-    Buffer.setPointer(BackupBuffer.release());
-
-    if (Diag.isDiagnosticInFlight())
-      Diag.SetDelayedDiagnostic(diag::err_cannot_open_file,
-                                ContentsEntry->getName(),
-                                BufferOrError.getError().message());
-    else
-      Diag.Report(Loc, diag::err_cannot_open_file)
-          << ContentsEntry->getName() << BufferOrError.getError().message();
-
-    Buffer.setInt(Buffer.getInt() | InvalidFlag);
-
-    if (Invalid) *Invalid = true;
-    return Buffer.getPointer();
-  }
-
-  Buffer.setPointer(BufferOrError->release());
-
-  // Check that the file's size is the same as in the file entry (which may
-  // have come from a stat cache).
-  if (getRawBuffer()->getBufferSize() != (size_t)ContentsEntry->getSize()) {
-    if (Diag.isDiagnosticInFlight())
-      Diag.SetDelayedDiagnostic(diag::err_file_modified,
-                                ContentsEntry->getName());
-    else
-      Diag.Report(Loc, diag::err_file_modified)
-        << ContentsEntry->getName();
-
-    Buffer.setInt(Buffer.getInt() | InvalidFlag);
-    if (Invalid) *Invalid = true;
-    return Buffer.getPointer();
-  }
-
-  // If the buffer is valid, check to see if it has a UTF Byte Order Mark
-  // (BOM).  We only support UTF-8 with and without a BOM right now.  See
-  // http://en.wikipedia.org/wiki/Byte_order_mark for more information.
-  StringRef BufStr = Buffer.getPointer()->getBuffer();
-  const char *InvalidBOM = llvm::StringSwitch<const char *>(BufStr)
-    .StartsWith(llvm::StringLiteral::withInnerNUL("\x00\x00\xFE\xFF"),
-                                                  "UTF-32 (BE)")
-    .StartsWith(llvm::StringLiteral::withInnerNUL("\xFF\xFE\x00\x00"),
-                                                  "UTF-32 (LE)")
-    .StartsWith("\xFE\xFF", "UTF-16 (BE)")
-    .StartsWith("\xFF\xFE", "UTF-16 (LE)")
-    .StartsWith("\x2B\x2F\x76", "UTF-7")
-    .StartsWith("\xF7\x64\x4C", "UTF-1")
-    .StartsWith("\xDD\x73\x66\x73", "UTF-EBCDIC")
-    .StartsWith("\x0E\xFE\xFF", "SCSU")
-    .StartsWith("\xFB\xEE\x28", "BOCU-1")
-    .StartsWith("\x84\x31\x95\x33", "GB-18030")
-    .Default(nullptr);
-
-  if (InvalidBOM) {
-    Diag.Report(Loc, diag::err_unsupported_bom)
-      << InvalidBOM << ContentsEntry->getName();
-    Buffer.setInt(Buffer.getInt() | InvalidFlag);
-  }
-
-  if (Invalid)
-    *Invalid = isBufferInvalid();
-
-  return Buffer.getPointer();
-}
-
-unsigned LineTableInfo::getLineTableFilenameID(StringRef Name) {
-  auto IterBool = FilenameIDs.try_emplace(Name, FilenamesByID.size());
-  if (IterBool.second)
-    FilenamesByID.push_back(&*IterBool.first);
-  return IterBool.first->second;
-}
-
-/// Add a line note to the line table that indicates that there is a \#line or
-/// GNU line marker at the specified FID/Offset location which changes the
-/// presumed location to LineNo/FilenameID. If EntryExit is 0, then this doesn't
-/// change the presumed \#include stack.  If it is 1, this is a file entry, if
-/// it is 2 then this is a file exit. FileKind specifies whether this is a
-/// system header or extern C system header.
-void LineTableInfo::AddLineNote(FileID FID, unsigned Offset, unsigned LineNo,
-                                int FilenameID, unsigned EntryExit,
-                                SrcMgr::CharacteristicKind FileKind) {
-  std::vector<LineEntry> &Entries = LineEntries[FID];
-
-  // An unspecified FilenameID means use the last filename if available, or the
-  // main source file otherwise.
-  if (FilenameID == -1 && !Entries.empty())
-    FilenameID = Entries.back().FilenameID;
-
-  assert((Entries.empty() || Entries.back().FileOffset < Offset) &&
-         "Adding line entries out of order!");
-
-  unsigned IncludeOffset = 0;
-  if (EntryExit == 0) {  // No #include stack change.
-    IncludeOffset = Entries.empty() ? 0 : Entries.back().IncludeOffset;
-  } else if (EntryExit == 1) {
-    IncludeOffset = Offset-1;
-  } else if (EntryExit == 2) {
-    assert(!Entries.empty() && Entries.back().IncludeOffset &&
-       "PPDirectives should have caught case when popping empty include stack");
-
-    // Get the include loc of the last entries' include loc as our include loc.
-    IncludeOffset = 0;
-    if (const LineEntry *PrevEntry =
-          FindNearestLineEntry(FID, Entries.back().IncludeOffset))
-      IncludeOffset = PrevEntry->IncludeOffset;
-  }
-
-  Entries.push_back(LineEntry::get(Offset, LineNo, FilenameID, FileKind,
-                                   IncludeOffset));
-}
-
-/// FindNearestLineEntry - Find the line entry nearest to FID that is before
-/// it.  If there is no line entry before Offset in FID, return null.
-const LineEntry *LineTableInfo::FindNearestLineEntry(FileID FID,
-                                                     unsigned Offset) {
-  const std::vector<LineEntry> &Entries = LineEntries[FID];
-  assert(!Entries.empty() && "No #line entries for this FID after all!");
-
-  // It is very common for the query to be after the last #line, check this
-  // first.
-  if (Entries.back().FileOffset <= Offset)
-    return &Entries.back();
-
-  // Do a binary search to find the maximal element that is still before Offset.
-  std::vector<LineEntry>::const_iterator I = llvm::upper_bound(Entries, Offset);
-  if (I == Entries.begin())
-    return nullptr;
-  return &*--I;
-}
-
-/// Add a new line entry that has already been encoded into
-/// the internal representation of the line table.
-void LineTableInfo::AddEntry(FileID FID,
-                             const std::vector<LineEntry> &Entries) {
-  LineEntries[FID] = Entries;
-}
-
-/// getLineTableFilenameID - Return the uniqued ID for the specified filename.
-unsigned SourceManager::getLineTableFilenameID(StringRef Name) {
-  return getLineTable().getLineTableFilenameID(Name);
-}
-
-/// AddLineNote - Add a line note to the line table for the FileID and offset
-/// specified by Loc.  If FilenameID is -1, it is considered to be
-/// unspecified.
-void SourceManager::AddLineNote(SourceLocation Loc, unsigned LineNo,
-                                int FilenameID, bool IsFileEntry,
-                                bool IsFileExit,
-                                SrcMgr::CharacteristicKind FileKind) {
-  std::pair<FileID, unsigned> LocInfo = getDecomposedExpansionLoc(Loc);
-
-  bool Invalid = false;
-  const SLocEntry &Entry = getSLocEntry(LocInfo.first, &Invalid);
-  if (!Entry.isFile() || Invalid)
-    return;
-
-  const SrcMgr::FileInfo &FileInfo = Entry.getFile();
-
-  // Remember that this file has #line directives now if it doesn't already.
-  const_cast<SrcMgr::FileInfo&>(FileInfo).setHasLineDirectives();
-
-  (void) getLineTable();
-
-  unsigned EntryExit = 0;
-  if (IsFileEntry)
-    EntryExit = 1;
-  else if (IsFileExit)
-    EntryExit = 2;
-
-  LineTable->AddLineNote(LocInfo.first, LocInfo.second, LineNo, FilenameID,
-                         EntryExit, FileKind);
-}
-
-LineTableInfo &SourceManager::getLineTable() {
-  if (!LineTable)
-    LineTable.reset(new LineTableInfo());
-  return *LineTable;
-}
-
-//===----------------------------------------------------------------------===//
-// Private 'Create' methods.
-//===----------------------------------------------------------------------===//
-
-SourceManager::SourceManager(DiagnosticsEngine &Diag, FileManager &FileMgr,
-                             bool UserFilesAreVolatile)
-  : Diag(Diag), FileMgr(FileMgr), UserFilesAreVolatile(UserFilesAreVolatile) {
-  clearIDTables();
-  Diag.setSourceManager(this);
-}
-
-SourceManager::~SourceManager() {
-  // Delete FileEntry objects corresponding to content caches.  Since the actual
-  // content cache objects are bump pointer allocated, we just have to run the
-  // dtors, but we call the deallocate method for completeness.
-  for (unsigned i = 0, e = MemBufferInfos.size(); i != e; ++i) {
-    if (MemBufferInfos[i]) {
-      MemBufferInfos[i]->~ContentCache();
-      ContentCacheAlloc.Deallocate(MemBufferInfos[i]);
-    }
-  }
-  for (llvm::DenseMap<const FileEntry*, SrcMgr::ContentCache*>::iterator
-       I = FileInfos.begin(), E = FileInfos.end(); I != E; ++I) {
-    if (I->second) {
-      I->second->~ContentCache();
-      ContentCacheAlloc.Deallocate(I->second);
-    }
-  }
-}
-
-void SourceManager::clearIDTables() {
-  MainFileID = FileID();
-  LocalSLocEntryTable.clear();
-  LoadedSLocEntryTable.clear();
-  SLocEntryLoaded.clear();
-  LastLineNoFileIDQuery = FileID();
-  LastLineNoContentCache = nullptr;
-  LastFileIDLookup = FileID();
-
-  if (LineTable)
-    LineTable->clear();
-
-  // Use up FileID #0 as an invalid expansion.
-  NextLocalOffset = 0;
-  CurrentLoadedOffset = MaxLoadedOffset;
-  createExpansionLoc(SourceLocation(), SourceLocation(), SourceLocation(), 1);
-}
-
-void SourceManager::initializeForReplay(const SourceManager &Old) {
-  assert(MainFileID.isInvalid() && "expected uninitialized SourceManager");
-
-  auto CloneContentCache = [&](const ContentCache *Cache) -> ContentCache * {
-    auto *Clone = new (ContentCacheAlloc.Allocate<ContentCache>()) ContentCache;
-    Clone->OrigEntry = Cache->OrigEntry;
-    Clone->ContentsEntry = Cache->ContentsEntry;
-    Clone->BufferOverridden = Cache->BufferOverridden;
-    Clone->IsSystemFile = Cache->IsSystemFile;
-    Clone->IsTransient = Cache->IsTransient;
-    Clone->replaceBuffer(Cache->getRawBuffer(), /*DoNotFree*/true);
-    return Clone;
-  };
-
-  // Ensure all SLocEntries are loaded from the external source.
-  for (unsigned I = 0, N = Old.LoadedSLocEntryTable.size(); I != N; ++I)
-    if (!Old.SLocEntryLoaded[I])
-      Old.loadSLocEntry(I, nullptr);
-
-  // Inherit any content cache data from the old source manager.
-  for (auto &FileInfo : Old.FileInfos) {
-    SrcMgr::ContentCache *&Slot = FileInfos[FileInfo.first];
-    if (Slot)
-      continue;
-    Slot = CloneContentCache(FileInfo.second);
-  }
-}
-
-/// getOrCreateContentCache - Create or return a cached ContentCache for the
-/// specified file.
-const ContentCache *
-SourceManager::getOrCreateContentCache(const FileEntry *FileEnt,
-                                       bool isSystemFile) {
-  assert(FileEnt && "Didn't specify a file entry to use?");
-
-  // Do we already have information about this file?
-  ContentCache *&Entry = FileInfos[FileEnt];
-  if (Entry) return Entry;
-
-  // Nope, create a new Cache entry.
-  Entry = ContentCacheAlloc.Allocate<ContentCache>();
-
-  if (OverriddenFilesInfo) {
-    // If the file contents are overridden with contents from another file,
-    // pass that file to ContentCache.
-    llvm::DenseMap<const FileEntry *, const FileEntry *>::iterator
-        overI = OverriddenFilesInfo->OverriddenFiles.find(FileEnt);
-    if (overI == OverriddenFilesInfo->OverriddenFiles.end())
-      new (Entry) ContentCache(FileEnt);
-    else
-      new (Entry) ContentCache(OverridenFilesKeepOriginalName ? FileEnt
-                                                              : overI->second,
-                               overI->second);
-  } else {
-    new (Entry) ContentCache(FileEnt);
-  }
-
-  Entry->IsSystemFile = isSystemFile;
-  Entry->IsTransient = FilesAreTransient;
-
-  return Entry;
-}
-
-/// Create a new ContentCache for the specified memory buffer.
-/// This does no caching.
-const ContentCache *
-SourceManager::createMemBufferContentCache(const llvm::MemoryBuffer *Buffer,
-                                           bool DoNotFree) {
-  // Add a new ContentCache to the MemBufferInfos list and return it.
-  ContentCache *Entry = ContentCacheAlloc.Allocate<ContentCache>();
-  new (Entry) ContentCache();
-  MemBufferInfos.push_back(Entry);
-  Entry->replaceBuffer(Buffer, DoNotFree);
-  return Entry;
-}
-
-const SrcMgr::SLocEntry &SourceManager::loadSLocEntry(unsigned Index,
-                                                      bool *Invalid) const {
-  assert(!SLocEntryLoaded[Index]);
-  if (ExternalSLocEntries->ReadSLocEntry(-(static_cast<int>(Index) + 2))) {
-    if (Invalid)
-      *Invalid = true;
-    // If the file of the SLocEntry changed we could still have loaded it.
-    if (!SLocEntryLoaded[Index]) {
-      // Try to recover; create a SLocEntry so the rest of clang can handle it.
-      LoadedSLocEntryTable[Index] = SLocEntry::get(0,
-                                 FileInfo::get(SourceLocation(),
-                                               getFakeContentCacheForRecovery(),
-                                               SrcMgr::C_User));
-    }
-  }
-
-  return LoadedSLocEntryTable[Index];
-}
-
-std::pair<int, unsigned>
-SourceManager::AllocateLoadedSLocEntries(unsigned NumSLocEntries,
-                                         unsigned TotalSize) {
-  assert(ExternalSLocEntries && "Don't have an external sloc source");
-  // Make sure we're not about to run out of source locations.
-  if (CurrentLoadedOffset - TotalSize < NextLocalOffset)
-    return std::make_pair(0, 0);
-  LoadedSLocEntryTable.resize(LoadedSLocEntryTable.size() + NumSLocEntries);
-  SLocEntryLoaded.resize(LoadedSLocEntryTable.size());
-  CurrentLoadedOffset -= TotalSize;
-  int ID = LoadedSLocEntryTable.size();
-  return std::make_pair(-ID - 1, CurrentLoadedOffset);
-}
-
-/// As part of recovering from missing or changed content, produce a
-/// fake, non-empty buffer.
-llvm::MemoryBuffer *SourceManager::getFakeBufferForRecovery() const {
-  if (!FakeBufferForRecovery)
-    FakeBufferForRecovery =
-        llvm::MemoryBuffer::getMemBuffer("<<<INVALID BUFFER>>");
-
-  return FakeBufferForRecovery.get();
-}
-
-/// As part of recovering from missing or changed content, produce a
-/// fake content cache.
-const SrcMgr::ContentCache *
-SourceManager::getFakeContentCacheForRecovery() const {
-  if (!FakeContentCacheForRecovery) {
-    FakeContentCacheForRecovery = llvm::make_unique<SrcMgr::ContentCache>();
-    FakeContentCacheForRecovery->replaceBuffer(getFakeBufferForRecovery(),
-                                               /*DoNotFree=*/true);
-  }
-  return FakeContentCacheForRecovery.get();
-}
-
-/// Returns the previous in-order FileID or an invalid FileID if there
-/// is no previous one.
-FileID SourceManager::getPreviousFileID(FileID FID) const {
-  if (FID.isInvalid())
-    return FileID();
-
-  int ID = FID.ID;
-  if (ID == -1)
-    return FileID();
-
-  if (ID > 0) {
-    if (ID-1 == 0)
-      return FileID();
-  } else if (unsigned(-(ID-1) - 2) >= LoadedSLocEntryTable.size()) {
-    return FileID();
-  }
-
-  return FileID::get(ID-1);
-}
-
-/// Returns the next in-order FileID or an invalid FileID if there is
-/// no next one.
-FileID SourceManager::getNextFileID(FileID FID) const {
-  if (FID.isInvalid())
-    return FileID();
-
-  int ID = FID.ID;
-  if (ID > 0) {
-    if (unsigned(ID+1) >= local_sloc_entry_size())
-      return FileID();
-  } else if (ID+1 >= -1) {
-    return FileID();
-  }
-
-  return FileID::get(ID+1);
-}
-
-//===----------------------------------------------------------------------===//
-// Methods to create new FileID's and macro expansions.
-//===----------------------------------------------------------------------===//
-
-/// createFileID - Create a new FileID for the specified ContentCache and
-/// include position.  This works regardless of whether the ContentCache
-/// corresponds to a file or some other input source.
-FileID SourceManager::createFileID(const ContentCache *File,
-                                   SourceLocation IncludePos,
-                                   SrcMgr::CharacteristicKind FileCharacter,
-                                   int LoadedID, unsigned LoadedOffset) {
-  if (LoadedID < 0) {
-    assert(LoadedID != -1 && "Loading sentinel FileID");
-    unsigned Index = unsigned(-LoadedID) - 2;
-    assert(Index < LoadedSLocEntryTable.size() && "FileID out of range");
-    assert(!SLocEntryLoaded[Index] && "FileID already loaded");
-    LoadedSLocEntryTable[Index] = SLocEntry::get(LoadedOffset,
-        FileInfo::get(IncludePos, File, FileCharacter));
-    SLocEntryLoaded[Index] = true;
-    return FileID::get(LoadedID);
-  }
-  LocalSLocEntryTable.push_back(SLocEntry::get(NextLocalOffset,
-                                               FileInfo::get(IncludePos, File,
-                                                             FileCharacter)));
-  unsigned FileSize = File->getSize();
-  assert(NextLocalOffset + FileSize + 1 > NextLocalOffset &&
-         NextLocalOffset + FileSize + 1 <= CurrentLoadedOffset &&
-         "Ran out of source locations!");
-  // We do a +1 here because we want a SourceLocation that means "the end of the
-  // file", e.g. for the "no newline at the end of the file" diagnostic.
-  NextLocalOffset += FileSize + 1;
-
-  // Set LastFileIDLookup to the newly created file.  The next getFileID call is
-  // almost guaranteed to be from that file.
-  FileID FID = FileID::get(LocalSLocEntryTable.size()-1);
-  return LastFileIDLookup = FID;
-}
-
-SourceLocation
-SourceManager::createMacroArgExpansionLoc(SourceLocation SpellingLoc,
-                                          SourceLocation ExpansionLoc,
-                                          unsigned TokLength) {
-  ExpansionInfo Info = ExpansionInfo::createForMacroArg(SpellingLoc,
-                                                        ExpansionLoc);
-  return createExpansionLocImpl(Info, TokLength);
-}
-
-SourceLocation
-SourceManager::createExpansionLoc(SourceLocation SpellingLoc,
-                                  SourceLocation ExpansionLocStart,
-                                  SourceLocation ExpansionLocEnd,
-                                  unsigned TokLength,
-                                  bool ExpansionIsTokenRange,
-                                  int LoadedID,
-                                  unsigned LoadedOffset) {
-  ExpansionInfo Info = ExpansionInfo::create(
-      SpellingLoc, ExpansionLocStart, ExpansionLocEnd, ExpansionIsTokenRange);
-  return createExpansionLocImpl(Info, TokLength, LoadedID, LoadedOffset);
-}
-
-SourceLocation SourceManager::createTokenSplitLoc(SourceLocation Spelling,
-                                                  SourceLocation TokenStart,
-                                                  SourceLocation TokenEnd) {
-  assert(getFileID(TokenStart) == getFileID(TokenEnd) &&
-         "token spans multiple files");
-  return createExpansionLocImpl(
-      ExpansionInfo::createForTokenSplit(Spelling, TokenStart, TokenEnd),
-      TokenEnd.getOffset() - TokenStart.getOffset());
-}
-
-SourceLocation
-SourceManager::createExpansionLocImpl(const ExpansionInfo &Info,
-                                      unsigned TokLength,
-                                      int LoadedID,
-                                      unsigned LoadedOffset) {
-  if (LoadedID < 0) {
-    assert(LoadedID != -1 && "Loading sentinel FileID");
-    unsigned Index = unsigned(-LoadedID) - 2;
-    assert(Index < LoadedSLocEntryTable.size() && "FileID out of range");
-    assert(!SLocEntryLoaded[Index] && "FileID already loaded");
-    LoadedSLocEntryTable[Index] = SLocEntry::get(LoadedOffset, Info);
-    SLocEntryLoaded[Index] = true;
-    return SourceLocation::getMacroLoc(LoadedOffset);
-  }
-  LocalSLocEntryTable.push_back(SLocEntry::get(NextLocalOffset, Info));
-  assert(NextLocalOffset + TokLength + 1 > NextLocalOffset &&
-         NextLocalOffset + TokLength + 1 <= CurrentLoadedOffset &&
-         "Ran out of source locations!");
-  // See createFileID for that +1.
-  NextLocalOffset += TokLength + 1;
-  return SourceLocation::getMacroLoc(NextLocalOffset - (TokLength + 1));
-}
-
-const llvm::MemoryBuffer *
-SourceManager::getMemoryBufferForFile(const FileEntry *File, bool *Invalid) {
-  const SrcMgr::ContentCache *IR = getOrCreateContentCache(File);
-  assert(IR && "getOrCreateContentCache() cannot return NULL");
-  return IR->getBuffer(Diag, *this, SourceLocation(), Invalid);
-}
-
-void SourceManager::overrideFileContents(const FileEntry *SourceFile,
-                                         llvm::MemoryBuffer *Buffer,
-                                         bool DoNotFree) {
-  const SrcMgr::ContentCache *IR = getOrCreateContentCache(SourceFile);
-  assert(IR && "getOrCreateContentCache() cannot return NULL");
-
-  const_cast<SrcMgr::ContentCache *>(IR)->replaceBuffer(Buffer, DoNotFree);
-  const_cast<SrcMgr::ContentCache *>(IR)->BufferOverridden = true;
-
-  getOverriddenFilesInfo().OverriddenFilesWithBuffer.insert(SourceFile);
-}
-
-void SourceManager::overrideFileContents(const FileEntry *SourceFile,
-                                         const FileEntry *NewFile) {
-  assert(SourceFile->getSize() == NewFile->getSize() &&
-         "Different sizes, use the FileManager to create a virtual file with "
-         "the correct size");
-  assert(FileInfos.count(SourceFile) == 0 &&
-         "This function should be called at the initialization stage, before "
-         "any parsing occurs.");
-  getOverriddenFilesInfo().OverriddenFiles[SourceFile] = NewFile;
-}
-
-void SourceManager::disableFileContentsOverride(const FileEntry *File) {
-  if (!isFileOverridden(File))
-    return;
-
-  const SrcMgr::ContentCache *IR = getOrCreateContentCache(File);
-  const_cast<SrcMgr::ContentCache *>(IR)->replaceBuffer(nullptr);
-  const_cast<SrcMgr::ContentCache *>(IR)->ContentsEntry = IR->OrigEntry;
-
-  assert(OverriddenFilesInfo);
-  OverriddenFilesInfo->OverriddenFiles.erase(File);
-  OverriddenFilesInfo->OverriddenFilesWithBuffer.erase(File);
-}
-
-void SourceManager::setFileIsTransient(const FileEntry *File) {
-  const SrcMgr::ContentCache *CC = getOrCreateContentCache(File);
-  const_cast<SrcMgr::ContentCache *>(CC)->IsTransient = true;
-}
-
-StringRef SourceManager::getBufferData(FileID FID, bool *Invalid) const {
-  bool MyInvalid = false;
-  const SLocEntry &SLoc = getSLocEntry(FID, &MyInvalid);
-  if (!SLoc.isFile() || MyInvalid) {
-    if (Invalid)
-      *Invalid = true;
-    return "<<<<<INVALID SOURCE LOCATION>>>>>";
-  }
-
-  const llvm::MemoryBuffer *Buf = SLoc.getFile().getContentCache()->getBuffer(
-      Diag, *this, SourceLocation(), &MyInvalid);
-  if (Invalid)
-    *Invalid = MyInvalid;
-
-  if (MyInvalid)
-    return "<<<<<INVALID SOURCE LOCATION>>>>>";
-
-  return Buf->getBuffer();
-}
-
-//===----------------------------------------------------------------------===//
-// SourceLocation manipulation methods.
-//===----------------------------------------------------------------------===//
-
-/// Return the FileID for a SourceLocation.
-///
-/// This is the cache-miss path of getFileID. Not as hot as that function, but
-/// still very important. It is responsible for finding the entry in the
-/// SLocEntry tables that contains the specified location.
-FileID SourceManager::getFileIDSlow(unsigned SLocOffset) const {
-  if (!SLocOffset)
-    return FileID::get(0);
-
-  // Now it is time to search for the correct file. See where the SLocOffset
-  // sits in the global view and consult local or loaded buffers for it.
-  if (SLocOffset < NextLocalOffset)
-    return getFileIDLocal(SLocOffset);
-  return getFileIDLoaded(SLocOffset);
-}
-
-/// Return the FileID for a SourceLocation with a low offset.
-///
-/// This function knows that the SourceLocation is in a local buffer, not a
-/// loaded one.
-FileID SourceManager::getFileIDLocal(unsigned SLocOffset) const {
-  assert(SLocOffset < NextLocalOffset && "Bad function choice");
-
-  // After the first and second level caches, I see two common sorts of
-  // behavior: 1) a lot of searched FileID's are "near" the cached file
-  // location or are "near" the cached expansion location. 2) others are just
-  // completely random and may be a very long way away.
-  //
-  // To handle this, we do a linear search for up to 8 steps to catch #1 quickly
-  // then we fall back to a less cache efficient, but more scalable, binary
-  // search to find the location.
-
-  // See if this is near the file point - worst case we start scanning from the
-  // most newly created FileID.
-  const SrcMgr::SLocEntry *I;
-
-  if (LastFileIDLookup.ID < 0 ||
-      LocalSLocEntryTable[LastFileIDLookup.ID].getOffset() < SLocOffset) {
-    // Neither loc prunes our search.
-    I = LocalSLocEntryTable.end();
-  } else {
-    // Perhaps it is near the file point.
-    I = LocalSLocEntryTable.begin()+LastFileIDLookup.ID;
-  }
-
-  // Find the FileID that contains this.  "I" is an iterator that points to a
-  // FileID whose offset is known to be larger than SLocOffset.
-  unsigned NumProbes = 0;
-  while (true) {
-    --I;
-    if (I->getOffset() <= SLocOffset) {
-      FileID Res = FileID::get(int(I - LocalSLocEntryTable.begin()));
-
-      // If this isn't an expansion, remember it.  We have good locality across
-      // FileID lookups.
-      if (!I->isExpansion())
-        LastFileIDLookup = Res;
-      NumLinearScans += NumProbes+1;
-      return Res;
-    }
-    if (++NumProbes == 8)
-      break;
-  }
-
-  // Convert "I" back into an index.  We know that it is an entry whose index is
-  // larger than the offset we are looking for.
-  unsigned GreaterIndex = I - LocalSLocEntryTable.begin();
-  // LessIndex - This is the lower bound of the range that we're searching.
-  // We know that the offset corresponding to the FileID is is less than
-  // SLocOffset.
-  unsigned LessIndex = 0;
-  NumProbes = 0;
-  while (true) {
-    bool Invalid = false;
-    unsigned MiddleIndex = (GreaterIndex-LessIndex)/2+LessIndex;
-    unsigned MidOffset = getLocalSLocEntry(MiddleIndex, &Invalid).getOffset();
-    if (Invalid)
-      return FileID::get(0);
-
-    ++NumProbes;
-
-    // If the offset of the midpoint is too large, chop the high side of the
-    // range to the midpoint.
-    if (MidOffset > SLocOffset) {
-      GreaterIndex = MiddleIndex;
-      continue;
-    }
-
-    // If the middle index contains the value, succeed and return.
-    // FIXME: This could be made faster by using a function that's aware of
-    // being in the local area.
-    if (isOffsetInFileID(FileID::get(MiddleIndex), SLocOffset)) {
-      FileID Res = FileID::get(MiddleIndex);
-
-      // If this isn't a macro expansion, remember it.  We have good locality
-      // across FileID lookups.
-      if (!LocalSLocEntryTable[MiddleIndex].isExpansion())
-        LastFileIDLookup = Res;
-      NumBinaryProbes += NumProbes;
-      return Res;
-    }
-
-    // Otherwise, move the low-side up to the middle index.
-    LessIndex = MiddleIndex;
-  }
-}
-
-/// Return the FileID for a SourceLocation with a high offset.
-///
-/// This function knows that the SourceLocation is in a loaded buffer, not a
-/// local one.
-FileID SourceManager::getFileIDLoaded(unsigned SLocOffset) const {
-  // Sanity checking, otherwise a bug may lead to hanging in release build.
-  if (SLocOffset < CurrentLoadedOffset) {
-    assert(0 && "Invalid SLocOffset or bad function choice");
-    return FileID();
-  }
-
-  // Essentially the same as the local case, but the loaded array is sorted
-  // in the other direction.
-
-  // First do a linear scan from the last lookup position, if possible.
-  unsigned I;
-  int LastID = LastFileIDLookup.ID;
-  if (LastID >= 0 || getLoadedSLocEntryByID(LastID).getOffset() < SLocOffset)
-    I = 0;
-  else
-    I = (-LastID - 2) + 1;
-
-  unsigned NumProbes;
-  for (NumProbes = 0; NumProbes < 8; ++NumProbes, ++I) {
-    // Make sure the entry is loaded!
-    const SrcMgr::SLocEntry &E = getLoadedSLocEntry(I);
-    if (E.getOffset() <= SLocOffset) {
-      FileID Res = FileID::get(-int(I) - 2);
-
-      if (!E.isExpansion())
-        LastFileIDLookup = Res;
-      NumLinearScans += NumProbes + 1;
-      return Res;
-    }
-  }
-
-  // Linear scan failed. Do the binary search. Note the reverse sorting of the
-  // table: GreaterIndex is the one where the offset is greater, which is
-  // actually a lower index!
-  unsigned GreaterIndex = I;
-  unsigned LessIndex = LoadedSLocEntryTable.size();
-  NumProbes = 0;
-  while (true) {
-    ++NumProbes;
-    unsigned MiddleIndex = (LessIndex - GreaterIndex) / 2 + GreaterIndex;
-    const SrcMgr::SLocEntry &E = getLoadedSLocEntry(MiddleIndex);
-    if (E.getOffset() == 0)
-      return FileID(); // invalid entry.
-
-    ++NumProbes;
-
-    if (E.getOffset() > SLocOffset) {
-      // Sanity checking, otherwise a bug may lead to hanging in release build.
-      if (GreaterIndex == MiddleIndex) {
-        assert(0 && "binary search missed the entry");
-        return FileID();
-      }
-      GreaterIndex = MiddleIndex;
-      continue;
-    }
-
-    if (isOffsetInFileID(FileID::get(-int(MiddleIndex) - 2), SLocOffset)) {
-      FileID Res = FileID::get(-int(MiddleIndex) - 2);
-      if (!E.isExpansion())
-        LastFileIDLookup = Res;
-      NumBinaryProbes += NumProbes;
-      return Res;
-    }
-
-    // Sanity checking, otherwise a bug may lead to hanging in release build.
-    if (LessIndex == MiddleIndex) {
-      assert(0 && "binary search missed the entry");
-      return FileID();
-    }
-    LessIndex = MiddleIndex;
-  }
-}
-
-SourceLocation SourceManager::
-getExpansionLocSlowCase(SourceLocation Loc) const {
-  do {
-    // Note: If Loc indicates an offset into a token that came from a macro
-    // expansion (e.g. the 5th character of the token) we do not want to add
-    // this offset when going to the expansion location.  The expansion
-    // location is the macro invocation, which the offset has nothing to do
-    // with.  This is unlike when we get the spelling loc, because the offset
-    // directly correspond to the token whose spelling we're inspecting.
-    Loc = getSLocEntry(getFileID(Loc)).getExpansion().getExpansionLocStart();
-  } while (!Loc.isFileID());
-
-  return Loc;
-}
-
-SourceLocation SourceManager::getSpellingLocSlowCase(SourceLocation Loc) const {
-  do {
-    std::pair<FileID, unsigned> LocInfo = getDecomposedLoc(Loc);
-    Loc = getSLocEntry(LocInfo.first).getExpansion().getSpellingLoc();
-    Loc = Loc.getLocWithOffset(LocInfo.second);
-  } while (!Loc.isFileID());
-  return Loc;
-}
-
-SourceLocation SourceManager::getFileLocSlowCase(SourceLocation Loc) const {
-  do {
-    if (isMacroArgExpansion(Loc))
-      Loc = getImmediateSpellingLoc(Loc);
-    else
-      Loc = getImmediateExpansionRange(Loc).getBegin();
-  } while (!Loc.isFileID());
-  return Loc;
-}
-
-
-std::pair<FileID, unsigned>
-SourceManager::getDecomposedExpansionLocSlowCase(
-                                             const SrcMgr::SLocEntry *E) const {
-  // If this is an expansion record, walk through all the expansion points.
-  FileID FID;
-  SourceLocation Loc;
-  unsigned Offset;
-  do {
-    Loc = E->getExpansion().getExpansionLocStart();
-
-    FID = getFileID(Loc);
-    E = &getSLocEntry(FID);
-    Offset = Loc.getOffset()-E->getOffset();
-  } while (!Loc.isFileID());
-
-  return std::make_pair(FID, Offset);
-}
-
-std::pair<FileID, unsigned>
-SourceManager::getDecomposedSpellingLocSlowCase(const SrcMgr::SLocEntry *E,
-                                                unsigned Offset) const {
-  // If this is an expansion record, walk through all the expansion points.
-  FileID FID;
-  SourceLocation Loc;
-  do {
-    Loc = E->getExpansion().getSpellingLoc();
-    Loc = Loc.getLocWithOffset(Offset);
-
-    FID = getFileID(Loc);
-    E = &getSLocEntry(FID);
-    Offset = Loc.getOffset()-E->getOffset();
-  } while (!Loc.isFileID());
-
-  return std::make_pair(FID, Offset);
-}
-
-/// getImmediateSpellingLoc - Given a SourceLocation object, return the
-/// spelling location referenced by the ID.  This is the first level down
-/// towards the place where the characters that make up the lexed token can be
-/// found.  This should not generally be used by clients.
-SourceLocation SourceManager::getImmediateSpellingLoc(SourceLocation Loc) const{
-  if (Loc.isFileID()) return Loc;
-  std::pair<FileID, unsigned> LocInfo = getDecomposedLoc(Loc);
-  Loc = getSLocEntry(LocInfo.first).getExpansion().getSpellingLoc();
-  return Loc.getLocWithOffset(LocInfo.second);
-}
-
-/// getImmediateExpansionRange - Loc is required to be an expansion location.
-/// Return the start/end of the expansion information.
-CharSourceRange
-SourceManager::getImmediateExpansionRange(SourceLocation Loc) const {
-  assert(Loc.isMacroID() && "Not a macro expansion loc!");
-  const ExpansionInfo &Expansion = getSLocEntry(getFileID(Loc)).getExpansion();
-  return Expansion.getExpansionLocRange();
-}
-
-SourceLocation SourceManager::getTopMacroCallerLoc(SourceLocation Loc) const {
-  while (isMacroArgExpansion(Loc))
-    Loc = getImmediateSpellingLoc(Loc);
-  return Loc;
-}
-
-/// getExpansionRange - Given a SourceLocation object, return the range of
-/// tokens covered by the expansion in the ultimate file.
-CharSourceRange SourceManager::getExpansionRange(SourceLocation Loc) const {
-  if (Loc.isFileID())
-    return CharSourceRange(SourceRange(Loc, Loc), true);
-
-  CharSourceRange Res = getImmediateExpansionRange(Loc);
-
-  // Fully resolve the start and end locations to their ultimate expansion
-  // points.
-  while (!Res.getBegin().isFileID())
-    Res.setBegin(getImmediateExpansionRange(Res.getBegin()).getBegin());
-  while (!Res.getEnd().isFileID()) {
-    CharSourceRange EndRange = getImmediateExpansionRange(Res.getEnd());
-    Res.setEnd(EndRange.getEnd());
-    Res.setTokenRange(EndRange.isTokenRange());
-  }
-  return Res;
-}
-
-bool SourceManager::isMacroArgExpansion(SourceLocation Loc,
-                                        SourceLocation *StartLoc) const {
-  if (!Loc.isMacroID()) return false;
-
-  FileID FID = getFileID(Loc);
-  const SrcMgr::ExpansionInfo &Expansion = getSLocEntry(FID).getExpansion();
-  if (!Expansion.isMacroArgExpansion()) return false;
-
-  if (StartLoc)
-    *StartLoc = Expansion.getExpansionLocStart();
-  return true;
-}
-
-bool SourceManager::isMacroBodyExpansion(SourceLocation Loc) const {
-  if (!Loc.isMacroID()) return false;
-
-  FileID FID = getFileID(Loc);
-  const SrcMgr::ExpansionInfo &Expansion = getSLocEntry(FID).getExpansion();
-  return Expansion.isMacroBodyExpansion();
-}
-
-bool SourceManager::isAtStartOfImmediateMacroExpansion(SourceLocation Loc,
-                                             SourceLocation *MacroBegin) const {
-  assert(Loc.isValid() && Loc.isMacroID() && "Expected a valid macro loc");
-
-  std::pair<FileID, unsigned> DecompLoc = getDecomposedLoc(Loc);
-  if (DecompLoc.second > 0)
-    return false; // Does not point at the start of expansion range.
-
-  bool Invalid = false;
-  const SrcMgr::ExpansionInfo &ExpInfo =
-      getSLocEntry(DecompLoc.first, &Invalid).getExpansion();
-  if (Invalid)
-    return false;
-  SourceLocation ExpLoc = ExpInfo.getExpansionLocStart();
-
-  if (ExpInfo.isMacroArgExpansion()) {
-    // For macro argument expansions, check if the previous FileID is part of
-    // the same argument expansion, in which case this Loc is not at the
-    // beginning of the expansion.
-    FileID PrevFID = getPreviousFileID(DecompLoc.first);
-    if (!PrevFID.isInvalid()) {
-      const SrcMgr::SLocEntry &PrevEntry = getSLocEntry(PrevFID, &Invalid);
-      if (Invalid)
-        return false;
-      if (PrevEntry.isExpansion() &&
-          PrevEntry.getExpansion().getExpansionLocStart() == ExpLoc)
-        return false;
-    }
-  }
-
-  if (MacroBegin)
-    *MacroBegin = ExpLoc;
-  return true;
-}
-
-bool SourceManager::isAtEndOfImmediateMacroExpansion(SourceLocation Loc,
-                                               SourceLocation *MacroEnd) const {
-  assert(Loc.isValid() && Loc.isMacroID() && "Expected a valid macro loc");
-
-  FileID FID = getFileID(Loc);
-  SourceLocation NextLoc = Loc.getLocWithOffset(1);
-  if (isInFileID(NextLoc, FID))
-    return false; // Does not point at the end of expansion range.
-
-  bool Invalid = false;
-  const SrcMgr::ExpansionInfo &ExpInfo =
-      getSLocEntry(FID, &Invalid).getExpansion();
-  if (Invalid)
-    return false;
-
-  if (ExpInfo.isMacroArgExpansion()) {
-    // For macro argument expansions, check if the next FileID is part of the
-    // same argument expansion, in which case this Loc is not at the end of the
-    // expansion.
-    FileID NextFID = getNextFileID(FID);
-    if (!NextFID.isInvalid()) {
-      const SrcMgr::SLocEntry &NextEntry = getSLocEntry(NextFID, &Invalid);
-      if (Invalid)
-        return false;
-      if (NextEntry.isExpansion() &&
-          NextEntry.getExpansion().getExpansionLocStart() ==
-              ExpInfo.getExpansionLocStart())
-        return false;
-    }
-  }
-
-  if (MacroEnd)
-    *MacroEnd = ExpInfo.getExpansionLocEnd();
-  return true;
-}
-
-//===----------------------------------------------------------------------===//
-// Queries about the code at a SourceLocation.
-//===----------------------------------------------------------------------===//
-
-/// getCharacterData - Return a pointer to the start of the specified location
-/// in the appropriate MemoryBuffer.
-const char *SourceManager::getCharacterData(SourceLocation SL,
-                                            bool *Invalid) const {
-  // Note that this is a hot function in the getSpelling() path, which is
-  // heavily used by -E mode.
-  std::pair<FileID, unsigned> LocInfo = getDecomposedSpellingLoc(SL);
-
-  // Note that calling 'getBuffer()' may lazily page in a source file.
-  bool CharDataInvalid = false;
-  const SLocEntry &Entry = getSLocEntry(LocInfo.first, &CharDataInvalid);
-  if (CharDataInvalid || !Entry.isFile()) {
-    if (Invalid)
-      *Invalid = true;
-
-    return "<<<<INVALID BUFFER>>>>";
-  }
-  const llvm::MemoryBuffer *Buffer =
-      Entry.getFile().getContentCache()->getBuffer(
-          Diag, *this, SourceLocation(), &CharDataInvalid);
-  if (Invalid)
-    *Invalid = CharDataInvalid;
-  return Buffer->getBufferStart() + (CharDataInvalid? 0 : LocInfo.second);
-}
-
-/// getColumnNumber - Return the column # for the specified file position.
-/// this is significantly cheaper to compute than the line number.
-unsigned SourceManager::getColumnNumber(FileID FID, unsigned FilePos,
-                                        bool *Invalid) const {
-  bool MyInvalid = false;
-  const llvm::MemoryBuffer *MemBuf = getBuffer(FID, &MyInvalid);
-  if (Invalid)
-    *Invalid = MyInvalid;
-
-  if (MyInvalid)
-    return 1;
-
-  // It is okay to request a position just past the end of the buffer.
-  if (FilePos > MemBuf->getBufferSize()) {
-    if (Invalid)
-      *Invalid = true;
-    return 1;
-  }
-
-  const char *Buf = MemBuf->getBufferStart();
-  // See if we just calculated the line number for this FilePos and can use
-  // that to lookup the start of the line instead of searching for it.
-  if (LastLineNoFileIDQuery == FID &&
-      LastLineNoContentCache->SourceLineCache != nullptr &&
-      LastLineNoResult < LastLineNoContentCache->NumLines) {
-    unsigned *SourceLineCache = LastLineNoContentCache->SourceLineCache;
-    unsigned LineStart = SourceLineCache[LastLineNoResult - 1];
-    unsigned LineEnd = SourceLineCache[LastLineNoResult];
-    if (FilePos >= LineStart && FilePos < LineEnd) {
-      // LineEnd is the LineStart of the next line.
-      // A line ends with separator LF or CR+LF on Windows.
-      // FilePos might point to the last separator,
-      // but we need a column number at most 1 + the last column.
-      if (FilePos + 1 == LineEnd && FilePos > LineStart) {
-        if (Buf[FilePos - 1] == '\r' || Buf[FilePos - 1] == '\n')
-          --FilePos;
-      }
-      return FilePos - LineStart + 1;
-    }
-  }
-
-  unsigned LineStart = FilePos;
-  while (LineStart && Buf[LineStart-1] != '\n' && Buf[LineStart-1] != '\r')
-    --LineStart;
-  return FilePos-LineStart+1;
-}
-
-// isInvalid - Return the result of calling loc.isInvalid(), and
-// if Invalid is not null, set its value to same.
-template<typename LocType>
-static bool isInvalid(LocType Loc, bool *Invalid) {
-  bool MyInvalid = Loc.isInvalid();
-  if (Invalid)
-    *Invalid = MyInvalid;
-  return MyInvalid;
-}
-
-unsigned SourceManager::getSpellingColumnNumber(SourceLocation Loc,
-                                                bool *Invalid) const {
-  if (isInvalid(Loc, Invalid)) return 0;
-  std::pair<FileID, unsigned> LocInfo = getDecomposedSpellingLoc(Loc);
-  return getColumnNumber(LocInfo.first, LocInfo.second, Invalid);
-}
-
-unsigned SourceManager::getExpansionColumnNumber(SourceLocation Loc,
-                                                 bool *Invalid) const {
-  if (isInvalid(Loc, Invalid)) return 0;
-  std::pair<FileID, unsigned> LocInfo = getDecomposedExpansionLoc(Loc);
-  return getColumnNumber(LocInfo.first, LocInfo.second, Invalid);
-}
-
-unsigned SourceManager::getPresumedColumnNumber(SourceLocation Loc,
-                                                bool *Invalid) const {
-  PresumedLoc PLoc = getPresumedLoc(Loc);
-  if (isInvalid(PLoc, Invalid)) return 0;
-  return PLoc.getColumn();
-}
-
-#ifdef __SSE2__
-#include <emmintrin.h>
-#endif
-
-static LLVM_ATTRIBUTE_NOINLINE void
-ComputeLineNumbers(DiagnosticsEngine &Diag, ContentCache *FI,
-                   llvm::BumpPtrAllocator &Alloc,
-                   const SourceManager &SM, bool &Invalid);
-static void ComputeLineNumbers(DiagnosticsEngine &Diag, ContentCache *FI,
-                               llvm::BumpPtrAllocator &Alloc,
-                               const SourceManager &SM, bool &Invalid) {
-  // Note that calling 'getBuffer()' may lazily page in the file.
-  const MemoryBuffer *Buffer =
-      FI->getBuffer(Diag, SM, SourceLocation(), &Invalid);
-  if (Invalid)
-    return;
-
-  // Find the file offsets of all of the *physical* source lines.  This does
-  // not look at trigraphs, escaped newlines, or anything else tricky.
-  SmallVector<unsigned, 256> LineOffsets;
-
-  // Line #1 starts at char 0.
-  LineOffsets.push_back(0);
-
-  const unsigned char *Buf = (const unsigned char *)Buffer->getBufferStart();
-  const unsigned char *End = (const unsigned char *)Buffer->getBufferEnd();
-  unsigned I = 0;
-  while (true) {
-    // Skip over the contents of the line.
-    while (Buf[I] != '\n' && Buf[I] != '\r' && Buf[I] != '\0')
-      ++I;
-
-    if (Buf[I] == '\n' || Buf[I] == '\r') {
-      // If this is \r\n, skip both characters.
-      if (Buf[I] == '\r' && Buf[I+1] == '\n')
-        ++I;
-      ++I;
-      LineOffsets.push_back(I);
-    } else {
-      // Otherwise, this is a NUL. If end of file, exit.
-      if (Buf+I == End) break;
-      ++I;
-    }
-  }
-
-  // Copy the offsets into the FileInfo structure.
-  FI->NumLines = LineOffsets.size();
-  FI->SourceLineCache = Alloc.Allocate<unsigned>(LineOffsets.size());
-  std::copy(LineOffsets.begin(), LineOffsets.end(), FI->SourceLineCache);
-}
-
-/// getLineNumber - Given a SourceLocation, return the spelling line number
-/// for the position indicated.  This requires building and caching a table of
-/// line offsets for the MemoryBuffer, so this is not cheap: use only when
-/// about to emit a diagnostic.
-unsigned SourceManager::getLineNumber(FileID FID, unsigned FilePos,
-                                      bool *Invalid) const {
-  if (FID.isInvalid()) {
-    if (Invalid)
-      *Invalid = true;
-    return 1;
-  }
-
-  ContentCache *Content;
-  if (LastLineNoFileIDQuery == FID)
-    Content = LastLineNoContentCache;
-  else {
-    bool MyInvalid = false;
-    const SLocEntry &Entry = getSLocEntry(FID, &MyInvalid);
-    if (MyInvalid || !Entry.isFile()) {
-      if (Invalid)
-        *Invalid = true;
-      return 1;
-    }
-
-    Content = const_cast<ContentCache*>(Entry.getFile().getContentCache());
-  }
-
-  // If this is the first use of line information for this buffer, compute the
-  /// SourceLineCache for it on demand.
-  if (!Content->SourceLineCache) {
-    bool MyInvalid = false;
-    ComputeLineNumbers(Diag, Content, ContentCacheAlloc, *this, MyInvalid);
-    if (Invalid)
-      *Invalid = MyInvalid;
-    if (MyInvalid)
-      return 1;
-  } else if (Invalid)
-    *Invalid = false;
-
-  // Okay, we know we have a line number table.  Do a binary search to find the
-  // line number that this character position lands on.
-  unsigned *SourceLineCache = Content->SourceLineCache;
-  unsigned *SourceLineCacheStart = SourceLineCache;
-  unsigned *SourceLineCacheEnd = SourceLineCache + Content->NumLines;
-
-  unsigned QueriedFilePos = FilePos+1;
-
-  // FIXME: I would like to be convinced that this code is worth being as
-  // complicated as it is, binary search isn't that slow.
-  //
-  // If it is worth being optimized, then in my opinion it could be more
-  // performant, simpler, and more obviously correct by just "galloping" outward
-  // from the queried file position. In fact, this could be incorporated into a
-  // generic algorithm such as lower_bound_with_hint.
-  //
-  // If someone gives me a test case where this matters, and I will do it! - DWD
-
-  // If the previous query was to the same file, we know both the file pos from
-  // that query and the line number returned.  This allows us to narrow the
-  // search space from the entire file to something near the match.
-  if (LastLineNoFileIDQuery == FID) {
-    if (QueriedFilePos >= LastLineNoFilePos) {
-      // FIXME: Potential overflow?
-      SourceLineCache = SourceLineCache+LastLineNoResult-1;
-
-      // The query is likely to be nearby the previous one.  Here we check to
-      // see if it is within 5, 10 or 20 lines.  It can be far away in cases
-      // where big comment blocks and vertical whitespace eat up lines but
-      // contribute no tokens.
-      if (SourceLineCache+5 < SourceLineCacheEnd) {
-        if (SourceLineCache[5] > QueriedFilePos)
-          SourceLineCacheEnd = SourceLineCache+5;
-        else if (SourceLineCache+10 < SourceLineCacheEnd) {
-          if (SourceLineCache[10] > QueriedFilePos)
-            SourceLineCacheEnd = SourceLineCache+10;
-          else if (SourceLineCache+20 < SourceLineCacheEnd) {
-            if (SourceLineCache[20] > QueriedFilePos)
-              SourceLineCacheEnd = SourceLineCache+20;
-          }
-        }
-      }
-    } else {
-      if (LastLineNoResult < Content->NumLines)
-        SourceLineCacheEnd = SourceLineCache+LastLineNoResult+1;
-    }
-  }
-
-  unsigned *Pos
-    = std::lower_bound(SourceLineCache, SourceLineCacheEnd, QueriedFilePos);
-  unsigned LineNo = Pos-SourceLineCacheStart;
-
-  LastLineNoFileIDQuery = FID;
-  LastLineNoContentCache = Content;
-  LastLineNoFilePos = QueriedFilePos;
-  LastLineNoResult = LineNo;
-  return LineNo;
-}
-
-unsigned SourceManager::getSpellingLineNumber(SourceLocation Loc,
-                                              bool *Invalid) const {
-  if (isInvalid(Loc, Invalid)) return 0;
-  std::pair<FileID, unsigned> LocInfo = getDecomposedSpellingLoc(Loc);
-  return getLineNumber(LocInfo.first, LocInfo.second);
-}
-unsigned SourceManager::getExpansionLineNumber(SourceLocation Loc,
-                                               bool *Invalid) const {
-  if (isInvalid(Loc, Invalid)) return 0;
-  std::pair<FileID, unsigned> LocInfo = getDecomposedExpansionLoc(Loc);
-  return getLineNumber(LocInfo.first, LocInfo.second);
-}
-unsigned SourceManager::getPresumedLineNumber(SourceLocation Loc,
-                                              bool *Invalid) const {
-  PresumedLoc PLoc = getPresumedLoc(Loc);
-  if (isInvalid(PLoc, Invalid)) return 0;
-  return PLoc.getLine();
-}
-
-/// getFileCharacteristic - return the file characteristic of the specified
-/// source location, indicating whether this is a normal file, a system
-/// header, or an "implicit extern C" system header.
-///
-/// This state can be modified with flags on GNU linemarker directives like:
-///   # 4 "foo.h" 3
-/// which changes all source locations in the current file after that to be
-/// considered to be from a system header.
-SrcMgr::CharacteristicKind
-SourceManager::getFileCharacteristic(SourceLocation Loc) const {
-  assert(Loc.isValid() && "Can't get file characteristic of invalid loc!");
-  std::pair<FileID, unsigned> LocInfo = getDecomposedExpansionLoc(Loc);
-  bool Invalid = false;
-  const SLocEntry &SEntry = getSLocEntry(LocInfo.first, &Invalid);
-  if (Invalid || !SEntry.isFile())
-    return C_User;
-
-  const SrcMgr::FileInfo &FI = SEntry.getFile();
-
-  // If there are no #line directives in this file, just return the whole-file
-  // state.
-  if (!FI.hasLineDirectives())
-    return FI.getFileCharacteristic();
-
-  assert(LineTable && "Can't have linetable entries without a LineTable!");
-  // See if there is a #line directive before the location.
-  const LineEntry *Entry =
-    LineTable->FindNearestLineEntry(LocInfo.first, LocInfo.second);
-
-  // If this is before the first line marker, use the file characteristic.
-  if (!Entry)
-    return FI.getFileCharacteristic();
-
-  return Entry->FileKind;
-}
-
-/// Return the filename or buffer identifier of the buffer the location is in.
-/// Note that this name does not respect \#line directives.  Use getPresumedLoc
-/// for normal clients.
-StringRef SourceManager::getBufferName(SourceLocation Loc,
-                                       bool *Invalid) const {
-  if (isInvalid(Loc, Invalid)) return "<invalid loc>";
-
-  return getBuffer(getFileID(Loc), Invalid)->getBufferIdentifier();
-}
-
-/// getPresumedLoc - This method returns the "presumed" location of a
-/// SourceLocation specifies.  A "presumed location" can be modified by \#line
-/// or GNU line marker directives.  This provides a view on the data that a
-/// user should see in diagnostics, for example.
-///
-/// Note that a presumed location is always given as the expansion point of an
-/// expansion location, not at the spelling location.
-PresumedLoc SourceManager::getPresumedLoc(SourceLocation Loc,
-                                          bool UseLineDirectives) const {
-  if (Loc.isInvalid()) return PresumedLoc();
-
-  // Presumed locations are always for expansion points.
-  std::pair<FileID, unsigned> LocInfo = getDecomposedExpansionLoc(Loc);
-
-  bool Invalid = false;
-  const SLocEntry &Entry = getSLocEntry(LocInfo.first, &Invalid);
-  if (Invalid || !Entry.isFile())
-    return PresumedLoc();
-
-  const SrcMgr::FileInfo &FI = Entry.getFile();
-  const SrcMgr::ContentCache *C = FI.getContentCache();
-
-  // To get the source name, first consult the FileEntry (if one exists)
-  // before the MemBuffer as this will avoid unnecessarily paging in the
-  // MemBuffer.
-  FileID FID = LocInfo.first;
-  StringRef Filename;
-  if (C->OrigEntry)
-    Filename = C->OrigEntry->getName();
-  else
-    Filename = C->getBuffer(Diag, *this)->getBufferIdentifier();
-
-  unsigned LineNo = getLineNumber(LocInfo.first, LocInfo.second, &Invalid);
-  if (Invalid)
-    return PresumedLoc();
-  unsigned ColNo  = getColumnNumber(LocInfo.first, LocInfo.second, &Invalid);
-  if (Invalid)
-    return PresumedLoc();
-
-  SourceLocation IncludeLoc = FI.getIncludeLoc();
-
-  // If we have #line directives in this file, update and overwrite the physical
-  // location info if appropriate.
-  if (UseLineDirectives && FI.hasLineDirectives()) {
-    assert(LineTable && "Can't have linetable entries without a LineTable!");
-    // See if there is a #line directive before this.  If so, get it.
-    if (const LineEntry *Entry =
-          LineTable->FindNearestLineEntry(LocInfo.first, LocInfo.second)) {
-      // If the LineEntry indicates a filename, use it.
-      if (Entry->FilenameID != -1) {
-        Filename = LineTable->getFilename(Entry->FilenameID);
-        // The contents of files referenced by #line are not in the
-        // SourceManager
-        FID = FileID::get(0);
-      }
-
-      // Use the line number specified by the LineEntry.  This line number may
-      // be multiple lines down from the line entry.  Add the difference in
-      // physical line numbers from the query point and the line marker to the
-      // total.
-      unsigned MarkerLineNo = getLineNumber(LocInfo.first, Entry->FileOffset);
-      LineNo = Entry->LineNo + (LineNo-MarkerLineNo-1);
-
-      // Note that column numbers are not molested by line markers.
-
-      // Handle virtual #include manipulation.
-      if (Entry->IncludeOffset) {
-        IncludeLoc = getLocForStartOfFile(LocInfo.first);
-        IncludeLoc = IncludeLoc.getLocWithOffset(Entry->IncludeOffset);
-      }
-    }
-  }
-
-  return PresumedLoc(Filename.data(), FID, LineNo, ColNo, IncludeLoc);
-}
-
-/// Returns whether the PresumedLoc for a given SourceLocation is
-/// in the main file.
-///
-/// This computes the "presumed" location for a SourceLocation, then checks
-/// whether it came from a file other than the main file. This is different
-/// from isWrittenInMainFile() because it takes line marker directives into
-/// account.
-bool SourceManager::isInMainFile(SourceLocation Loc) const {
-  if (Loc.isInvalid()) return false;
-
-  // Presumed locations are always for expansion points.
-  std::pair<FileID, unsigned> LocInfo = getDecomposedExpansionLoc(Loc);
-
-  bool Invalid = false;
-  const SLocEntry &Entry = getSLocEntry(LocInfo.first, &Invalid);
-  if (Invalid || !Entry.isFile())
-    return false;
-
-  const SrcMgr::FileInfo &FI = Entry.getFile();
-
-  // Check if there is a line directive for this location.
-  if (FI.hasLineDirectives())
-    if (const LineEntry *Entry =
-            LineTable->FindNearestLineEntry(LocInfo.first, LocInfo.second))
-      if (Entry->IncludeOffset)
-        return false;
-
-  return FI.getIncludeLoc().isInvalid();
-}
-
-/// The size of the SLocEntry that \p FID represents.
-unsigned SourceManager::getFileIDSize(FileID FID) const {
-  bool Invalid = false;
-  const SrcMgr::SLocEntry &Entry = getSLocEntry(FID, &Invalid);
-  if (Invalid)
-    return 0;
-
-  int ID = FID.ID;
-  unsigned NextOffset;
-  if ((ID > 0 && unsigned(ID+1) == local_sloc_entry_size()))
-    NextOffset = getNextLocalOffset();
-  else if (ID+1 == -1)
-    NextOffset = MaxLoadedOffset;
-  else
-    NextOffset = getSLocEntry(FileID::get(ID+1)).getOffset();
-
-  return NextOffset - Entry.getOffset() - 1;
-}
-
-//===----------------------------------------------------------------------===//
-// Other miscellaneous methods.
-//===----------------------------------------------------------------------===//
-
-/// Retrieve the inode for the given file entry, if possible.
-///
-/// This routine involves a system call, and therefore should only be used
-/// in non-performance-critical code.
-static Optional<llvm::sys::fs::UniqueID>
-getActualFileUID(const FileEntry *File) {
-  if (!File)
-    return None;
-
-  llvm::sys::fs::UniqueID ID;
-  if (llvm::sys::fs::getUniqueID(File->getName(), ID))
-    return None;
-
-  return ID;
-}
-
-/// Get the source location for the given file:line:col triplet.
-///
-/// If the source file is included multiple times, the source location will
-/// be based upon an arbitrary inclusion.
-SourceLocation SourceManager::translateFileLineCol(const FileEntry *SourceFile,
-                                                  unsigned Line,
-                                                  unsigned Col) const {
-  assert(SourceFile && "Null source file!");
-  assert(Line && Col && "Line and column should start from 1!");
-
-  FileID FirstFID = translateFile(SourceFile);
-  return translateLineCol(FirstFID, Line, Col);
-}
-
-/// Get the FileID for the given file.
-///
-/// If the source file is included multiple times, the FileID will be the
-/// first inclusion.
-FileID SourceManager::translateFile(const FileEntry *SourceFile) const {
-  assert(SourceFile && "Null source file!");
-
-  // Find the first file ID that corresponds to the given file.
-  FileID FirstFID;
-
-  // First, check the main file ID, since it is common to look for a
-  // location in the main file.
-  Optional<llvm::sys::fs::UniqueID> SourceFileUID;
-  Optional<StringRef> SourceFileName;
-  if (MainFileID.isValid()) {
-    bool Invalid = false;
-    const SLocEntry &MainSLoc = getSLocEntry(MainFileID, &Invalid);
-    if (Invalid)
-      return FileID();
-
-    if (MainSLoc.isFile()) {
-      const ContentCache *MainContentCache
-        = MainSLoc.getFile().getContentCache();
-      if (!MainContentCache || !MainContentCache->OrigEntry) {
-        // Can't do anything
-      } else if (MainContentCache->OrigEntry == SourceFile) {
-        FirstFID = MainFileID;
-      } else {
-        // Fall back: check whether we have the same base name and inode
-        // as the main file.
-        const FileEntry *MainFile = MainContentCache->OrigEntry;
-        SourceFileName = llvm::sys::path::filename(SourceFile->getName());
-        if (*SourceFileName == llvm::sys::path::filename(MainFile->getName())) {
-          SourceFileUID = getActualFileUID(SourceFile);
-          if (SourceFileUID) {
-            if (Optional<llvm::sys::fs::UniqueID> MainFileUID =
-                    getActualFileUID(MainFile)) {
-              if (*SourceFileUID == *MainFileUID) {
-                FirstFID = MainFileID;
-                SourceFile = MainFile;
-              }
-            }
-          }
-        }
-      }
-    }
-  }
-
-  if (FirstFID.isInvalid()) {
-    // The location we're looking for isn't in the main file; look
-    // through all of the local source locations.
-    for (unsigned I = 0, N = local_sloc_entry_size(); I != N; ++I) {
-      bool Invalid = false;
-      const SLocEntry &SLoc = getLocalSLocEntry(I, &Invalid);
-      if (Invalid)
-        return FileID();
-
-      if (SLoc.isFile() &&
-          SLoc.getFile().getContentCache() &&
-          SLoc.getFile().getContentCache()->OrigEntry == SourceFile) {
-        FirstFID = FileID::get(I);
-        break;
-      }
-    }
-    // If that still didn't help, try the modules.
-    if (FirstFID.isInvalid()) {
-      for (unsigned I = 0, N = loaded_sloc_entry_size(); I != N; ++I) {
-        const SLocEntry &SLoc = getLoadedSLocEntry(I);
-        if (SLoc.isFile() &&
-            SLoc.getFile().getContentCache() &&
-            SLoc.getFile().getContentCache()->OrigEntry == SourceFile) {
-          FirstFID = FileID::get(-int(I) - 2);
-          break;
-        }
-      }
-    }
-  }
-
-  // If we haven't found what we want yet, try again, but this time stat()
-  // each of the files in case the files have changed since we originally
-  // parsed the file.
-  if (FirstFID.isInvalid() &&
-      (SourceFileName ||
-       (SourceFileName = llvm::sys::path::filename(SourceFile->getName()))) &&
-      (SourceFileUID || (SourceFileUID = getActualFileUID(SourceFile)))) {
-    bool Invalid = false;
-    for (unsigned I = 0, N = local_sloc_entry_size(); I != N; ++I) {
-      FileID IFileID;
-      IFileID.ID = I;
-      const SLocEntry &SLoc = getSLocEntry(IFileID, &Invalid);
-      if (Invalid)
-        return FileID();
-
-      if (SLoc.isFile()) {
-        const ContentCache *FileContentCache
-          = SLoc.getFile().getContentCache();
-        const FileEntry *Entry = FileContentCache ? FileContentCache->OrigEntry
-                                                  : nullptr;
-        if (Entry &&
-            *SourceFileName == llvm::sys::path::filename(Entry->getName())) {
-          if (Optional<llvm::sys::fs::UniqueID> EntryUID =
-                  getActualFileUID(Entry)) {
-            if (*SourceFileUID == *EntryUID) {
-              FirstFID = FileID::get(I);
-              SourceFile = Entry;
-              break;
-            }
-          }
-        }
-      }
-    }
-  }
-
-  (void) SourceFile;
-  return FirstFID;
-}
-
-/// Get the source location in \arg FID for the given line:col.
-/// Returns null location if \arg FID is not a file SLocEntry.
-SourceLocation SourceManager::translateLineCol(FileID FID,
-                                               unsigned Line,
-                                               unsigned Col) const {
-  // Lines are used as a one-based index into a zero-based array. This assert
-  // checks for possible buffer underruns.
-  assert(Line && Col && "Line and column should start from 1!");
-
-  if (FID.isInvalid())
-    return SourceLocation();
-
-  bool Invalid = false;
-  const SLocEntry &Entry = getSLocEntry(FID, &Invalid);
-  if (Invalid)
-    return SourceLocation();
-
-  if (!Entry.isFile())
-    return SourceLocation();
-
-  SourceLocation FileLoc = SourceLocation::getFileLoc(Entry.getOffset());
-
-  if (Line == 1 && Col == 1)
-    return FileLoc;
-
-  ContentCache *Content
-    = const_cast<ContentCache *>(Entry.getFile().getContentCache());
-  if (!Content)
-    return SourceLocation();
-
-  // If this is the first use of line information for this buffer, compute the
-  // SourceLineCache for it on demand.
-  if (!Content->SourceLineCache) {
-    bool MyInvalid = false;
-    ComputeLineNumbers(Diag, Content, ContentCacheAlloc, *this, MyInvalid);
-    if (MyInvalid)
-      return SourceLocation();
-  }
-
-  if (Line > Content->NumLines) {
-    unsigned Size = Content->getBuffer(Diag, *this)->getBufferSize();
-    if (Size > 0)
-      --Size;
-    return FileLoc.getLocWithOffset(Size);
-  }
-
-  const llvm::MemoryBuffer *Buffer = Content->getBuffer(Diag, *this);
-  unsigned FilePos = Content->SourceLineCache[Line - 1];
-  const char *Buf = Buffer->getBufferStart() + FilePos;
-  unsigned BufLength = Buffer->getBufferSize() - FilePos;
-  if (BufLength == 0)
-    return FileLoc.getLocWithOffset(FilePos);
-
-  unsigned i = 0;
-
-  // Check that the given column is valid.
-  while (i < BufLength-1 && i < Col-1 && Buf[i] != '\n' && Buf[i] != '\r')
-    ++i;
-  return FileLoc.getLocWithOffset(FilePos + i);
-}
-
-/// Compute a map of macro argument chunks to their expanded source
-/// location. Chunks that are not part of a macro argument will map to an
-/// invalid source location. e.g. if a file contains one macro argument at
-/// offset 100 with length 10, this is how the map will be formed:
-///     0   -> SourceLocation()
-///     100 -> Expanded macro arg location
-///     110 -> SourceLocation()
-void SourceManager::computeMacroArgsCache(MacroArgsMap &MacroArgsCache,
-                                          FileID FID) const {
-  assert(FID.isValid());
-
-  // Initially no macro argument chunk is present.
-  MacroArgsCache.insert(std::make_pair(0, SourceLocation()));
-
-  int ID = FID.ID;
-  while (true) {
-    ++ID;
-    // Stop if there are no more FileIDs to check.
-    if (ID > 0) {
-      if (unsigned(ID) >= local_sloc_entry_size())
-        return;
-    } else if (ID == -1) {
-      return;
-    }
-
-    bool Invalid = false;
-    const SrcMgr::SLocEntry &Entry = getSLocEntryByID(ID, &Invalid);
-    if (Invalid)
-      return;
-    if (Entry.isFile()) {
-      SourceLocation IncludeLoc = Entry.getFile().getIncludeLoc();
-      if (IncludeLoc.isInvalid())
-        continue;
-      if (!isInFileID(IncludeLoc, FID))
-        return; // No more files/macros that may be "contained" in this file.
-
-      // Skip the files/macros of the #include'd file, we only care about macros
-      // that lexed macro arguments from our file.
-      if (Entry.getFile().NumCreatedFIDs)
-        ID += Entry.getFile().NumCreatedFIDs - 1/*because of next ++ID*/;
-      continue;
-    }
-
-    const ExpansionInfo &ExpInfo = Entry.getExpansion();
-
-    if (ExpInfo.getExpansionLocStart().isFileID()) {
-      if (!isInFileID(ExpInfo.getExpansionLocStart(), FID))
-        return; // No more files/macros that may be "contained" in this file.
-    }
-
-    if (!ExpInfo.isMacroArgExpansion())
-      continue;
-
-    associateFileChunkWithMacroArgExp(MacroArgsCache, FID,
-                                 ExpInfo.getSpellingLoc(),
-                                 SourceLocation::getMacroLoc(Entry.getOffset()),
-                                 getFileIDSize(FileID::get(ID)));
-  }
-}
-
-void SourceManager::associateFileChunkWithMacroArgExp(
-                                         MacroArgsMap &MacroArgsCache,
-                                         FileID FID,
-                                         SourceLocation SpellLoc,
-                                         SourceLocation ExpansionLoc,
-                                         unsigned ExpansionLength) const {
-  if (!SpellLoc.isFileID()) {
-    unsigned SpellBeginOffs = SpellLoc.getOffset();
-    unsigned SpellEndOffs = SpellBeginOffs + ExpansionLength;
-
-    // The spelling range for this macro argument expansion can span multiple
-    // consecutive FileID entries. Go through each entry contained in the
-    // spelling range and if one is itself a macro argument expansion, recurse
-    // and associate the file chunk that it represents.
-
-    FileID SpellFID; // Current FileID in the spelling range.
-    unsigned SpellRelativeOffs;
-    std::tie(SpellFID, SpellRelativeOffs) = getDecomposedLoc(SpellLoc);
-    while (true) {
-      const SLocEntry &Entry = getSLocEntry(SpellFID);
-      unsigned SpellFIDBeginOffs = Entry.getOffset();
-      unsigned SpellFIDSize = getFileIDSize(SpellFID);
-      unsigned SpellFIDEndOffs = SpellFIDBeginOffs + SpellFIDSize;
-      const ExpansionInfo &Info = Entry.getExpansion();
-      if (Info.isMacroArgExpansion()) {
-        unsigned CurrSpellLength;
-        if (SpellFIDEndOffs < SpellEndOffs)
-          CurrSpellLength = SpellFIDSize - SpellRelativeOffs;
-        else
-          CurrSpellLength = ExpansionLength;
-        associateFileChunkWithMacroArgExp(MacroArgsCache, FID,
-                      Info.getSpellingLoc().getLocWithOffset(SpellRelativeOffs),
-                      ExpansionLoc, CurrSpellLength);
-      }
-
-      if (SpellFIDEndOffs >= SpellEndOffs)
-        return; // we covered all FileID entries in the spelling range.
-
-      // Move to the next FileID entry in the spelling range.
-      unsigned advance = SpellFIDSize - SpellRelativeOffs + 1;
-      ExpansionLoc = ExpansionLoc.getLocWithOffset(advance);
-      ExpansionLength -= advance;
-      ++SpellFID.ID;
-      SpellRelativeOffs = 0;
-    }
-  }
-
-  assert(SpellLoc.isFileID());
-
-  unsigned BeginOffs;
-  if (!isInFileID(SpellLoc, FID, &BeginOffs))
-    return;
-
-  unsigned EndOffs = BeginOffs + ExpansionLength;
-
-  // Add a new chunk for this macro argument. A previous macro argument chunk
-  // may have been lexed again, so e.g. if the map is
-  //     0   -> SourceLocation()
-  //     100 -> Expanded loc #1
-  //     110 -> SourceLocation()
-  // and we found a new macro FileID that lexed from offset 105 with length 3,
-  // the new map will be:
-  //     0   -> SourceLocation()
-  //     100 -> Expanded loc #1
-  //     105 -> Expanded loc #2
-  //     108 -> Expanded loc #1
-  //     110 -> SourceLocation()
-  //
-  // Since re-lexed macro chunks will always be the same size or less of
-  // previous chunks, we only need to find where the ending of the new macro
-  // chunk is mapped to and update the map with new begin/end mappings.
-
-  MacroArgsMap::iterator I = MacroArgsCache.upper_bound(EndOffs);
-  --I;
-  SourceLocation EndOffsMappedLoc = I->second;
-  MacroArgsCache[BeginOffs] = ExpansionLoc;
-  MacroArgsCache[EndOffs] = EndOffsMappedLoc;
-}
-
-/// If \arg Loc points inside a function macro argument, the returned
-/// location will be the macro location in which the argument was expanded.
-/// If a macro argument is used multiple times, the expanded location will
-/// be at the first expansion of the argument.
-/// e.g.
-///   MY_MACRO(foo);
-///             ^
-/// Passing a file location pointing at 'foo', will yield a macro location
-/// where 'foo' was expanded into.
-SourceLocation
-SourceManager::getMacroArgExpandedLocation(SourceLocation Loc) const {
-  if (Loc.isInvalid() || !Loc.isFileID())
-    return Loc;
-
-  FileID FID;
-  unsigned Offset;
-  std::tie(FID, Offset) = getDecomposedLoc(Loc);
-  if (FID.isInvalid())
-    return Loc;
-
-  std::unique_ptr<MacroArgsMap> &MacroArgsCache = MacroArgsCacheMap[FID];
-  if (!MacroArgsCache) {
-    MacroArgsCache = llvm::make_unique<MacroArgsMap>();
-    computeMacroArgsCache(*MacroArgsCache, FID);
-  }
-
-  assert(!MacroArgsCache->empty());
-  MacroArgsMap::iterator I = MacroArgsCache->upper_bound(Offset);
-  --I;
-
-  unsigned MacroArgBeginOffs = I->first;
-  SourceLocation MacroArgExpandedLoc = I->second;
-  if (MacroArgExpandedLoc.isValid())
-    return MacroArgExpandedLoc.getLocWithOffset(Offset - MacroArgBeginOffs);
-
-  return Loc;
-}
-
-std::pair<FileID, unsigned>
-SourceManager::getDecomposedIncludedLoc(FileID FID) const {
-  if (FID.isInvalid())
-    return std::make_pair(FileID(), 0);
-
-  // Uses IncludedLocMap to retrieve/cache the decomposed loc.
-
-  using DecompTy = std::pair<FileID, unsigned>;
-  auto InsertOp = IncludedLocMap.try_emplace(FID);
-  DecompTy &DecompLoc = InsertOp.first->second;
-  if (!InsertOp.second)
-    return DecompLoc; // already in map.
-
-  SourceLocation UpperLoc;
-  bool Invalid = false;
-  const SrcMgr::SLocEntry &Entry = getSLocEntry(FID, &Invalid);
-  if (!Invalid) {
-    if (Entry.isExpansion())
-      UpperLoc = Entry.getExpansion().getExpansionLocStart();
-    else
-      UpperLoc = Entry.getFile().getIncludeLoc();
-  }
-
-  if (UpperLoc.isValid())
-    DecompLoc = getDecomposedLoc(UpperLoc);
-
-  return DecompLoc;
-}
-
-/// Given a decomposed source location, move it up the include/expansion stack
-/// to the parent source location.  If this is possible, return the decomposed
-/// version of the parent in Loc and return false.  If Loc is the top-level
-/// entry, return true and don't modify it.
-static bool MoveUpIncludeHierarchy(std::pair<FileID, unsigned> &Loc,
-                                   const SourceManager &SM) {
-  std::pair<FileID, unsigned> UpperLoc = SM.getDecomposedIncludedLoc(Loc.first);
-  if (UpperLoc.first.isInvalid())
-    return true; // We reached the top.
-
-  Loc = UpperLoc;
-  return false;
-}
-
-/// Return the cache entry for comparing the given file IDs
-/// for isBeforeInTranslationUnit.
-InBeforeInTUCacheEntry &SourceManager::getInBeforeInTUCache(FileID LFID,
-                                                            FileID RFID) const {
-  // This is a magic number for limiting the cache size.  It was experimentally
-  // derived from a small Objective-C project (where the cache filled
-  // out to ~250 items).  We can make it larger if necessary.
-  enum { MagicCacheSize = 300 };
-  IsBeforeInTUCacheKey Key(LFID, RFID);
-
-  // If the cache size isn't too large, do a lookup and if necessary default
-  // construct an entry.  We can then return it to the caller for direct
-  // use.  When they update the value, the cache will get automatically
-  // updated as well.
-  if (IBTUCache.size() < MagicCacheSize)
-    return IBTUCache[Key];
-
-  // Otherwise, do a lookup that will not construct a new value.
-  InBeforeInTUCache::iterator I = IBTUCache.find(Key);
-  if (I != IBTUCache.end())
-    return I->second;
-
-  // Fall back to the overflow value.
-  return IBTUCacheOverflow;
-}
-
-/// Determines the order of 2 source locations in the translation unit.
-///
-/// \returns true if LHS source location comes before RHS, false otherwise.
-bool SourceManager::isBeforeInTranslationUnit(SourceLocation LHS,
-                                              SourceLocation RHS) const {
-  assert(LHS.isValid() && RHS.isValid() && "Passed invalid source location!");
-  if (LHS == RHS)
-    return false;
-
-  std::pair<FileID, unsigned> LOffs = getDecomposedLoc(LHS);
-  std::pair<FileID, unsigned> ROffs = getDecomposedLoc(RHS);
-
-  // getDecomposedLoc may have failed to return a valid FileID because, e.g. it
-  // is a serialized one referring to a file that was removed after we loaded
-  // the PCH.
-  if (LOffs.first.isInvalid() || ROffs.first.isInvalid())
-    return LOffs.first.isInvalid() && !ROffs.first.isInvalid();
-
-  std::pair<bool, bool> InSameTU = isInTheSameTranslationUnit(LOffs, ROffs);
-  if (InSameTU.first)
-    return InSameTU.second;
-
-  // If we arrived here, the location is either in a built-ins buffer or
-  // associated with global inline asm. PR5662 and PR22576 are examples.
-
-  StringRef LB = getBuffer(LOffs.first)->getBufferIdentifier();
-  StringRef RB = getBuffer(ROffs.first)->getBufferIdentifier();
-  bool LIsBuiltins = LB == "<built-in>";
-  bool RIsBuiltins = RB == "<built-in>";
-  // Sort built-in before non-built-in.
-  if (LIsBuiltins || RIsBuiltins) {
-    if (LIsBuiltins != RIsBuiltins)
-      return LIsBuiltins;
-    // Both are in built-in buffers, but from different files. We just claim that
-    // lower IDs come first.
-    return LOffs.first < ROffs.first;
-  }
-  bool LIsAsm = LB == "<inline asm>";
-  bool RIsAsm = RB == "<inline asm>";
-  // Sort assembler after built-ins, but before the rest.
-  if (LIsAsm || RIsAsm) {
-    if (LIsAsm != RIsAsm)
-      return RIsAsm;
-    assert(LOffs.first == ROffs.first);
-    return false;
-  }
-  bool LIsScratch = LB == "<scratch space>";
-  bool RIsScratch = RB == "<scratch space>";
-  // Sort scratch after inline asm, but before the rest.
-  if (LIsScratch || RIsScratch) {
-    if (LIsScratch != RIsScratch)
-      return LIsScratch;
-    return LOffs.second < ROffs.second;
-  }
-  llvm_unreachable("Unsortable locations found");
-}
-
-std::pair<bool, bool> SourceManager::isInTheSameTranslationUnit(
-    std::pair<FileID, unsigned> &LOffs,
-    std::pair<FileID, unsigned> &ROffs) const {
-  // If the source locations are in the same file, just compare offsets.
-  if (LOffs.first == ROffs.first)
-    return std::make_pair(true, LOffs.second < ROffs.second);
-
-  // If we are comparing a source location with multiple locations in the same
-  // file, we get a big win by caching the result.
-  InBeforeInTUCacheEntry &IsBeforeInTUCache =
-    getInBeforeInTUCache(LOffs.first, ROffs.first);
-
-  // If we are comparing a source location with multiple locations in the same
-  // file, we get a big win by caching the result.
-  if (IsBeforeInTUCache.isCacheValid(LOffs.first, ROffs.first))
-    return std::make_pair(
-        true, IsBeforeInTUCache.getCachedResult(LOffs.second, ROffs.second));
-
-  // Okay, we missed in the cache, start updating the cache for this query.
-  IsBeforeInTUCache.setQueryFIDs(LOffs.first, ROffs.first,
-                          /*isLFIDBeforeRFID=*/LOffs.first.ID < ROffs.first.ID);
-
-  // We need to find the common ancestor. The only way of doing this is to
-  // build the complete include chain for one and then walking up the chain
-  // of the other looking for a match.
-  // We use a map from FileID to Offset to store the chain. Easier than writing
-  // a custom set hash info that only depends on the first part of a pair.
-  using LocSet = llvm::SmallDenseMap<FileID, unsigned, 16>;
-  LocSet LChain;
-  do {
-    LChain.insert(LOffs);
-    // We catch the case where LOffs is in a file included by ROffs and
-    // quit early. The other way round unfortunately remains suboptimal.
-  } while (LOffs.first != ROffs.first && !MoveUpIncludeHierarchy(LOffs, *this));
-  LocSet::iterator I;
-  while((I = LChain.find(ROffs.first)) == LChain.end()) {
-    if (MoveUpIncludeHierarchy(ROffs, *this))
-      break; // Met at topmost file.
-  }
-  if (I != LChain.end())
-    LOffs = *I;
-
-  // If we exited because we found a nearest common ancestor, compare the
-  // locations within the common file and cache them.
-  if (LOffs.first == ROffs.first) {
-    IsBeforeInTUCache.setCommonLoc(LOffs.first, LOffs.second, ROffs.second);
-    return std::make_pair(
-        true, IsBeforeInTUCache.getCachedResult(LOffs.second, ROffs.second));
-  }
-  // Clear the lookup cache, it depends on a common location.
-  IsBeforeInTUCache.clear();
-  return std::make_pair(false, false);
-}
-
-void SourceManager::PrintStats() const {
-  llvm::errs() << "\n*** Source Manager Stats:\n";
-  llvm::errs() << FileInfos.size() << " files mapped, " << MemBufferInfos.size()
-               << " mem buffers mapped.\n";
-  llvm::errs() << LocalSLocEntryTable.size() << " local SLocEntry's allocated ("
-               << llvm::capacity_in_bytes(LocalSLocEntryTable)
-               << " bytes of capacity), "
-               << NextLocalOffset << "B of Sloc address space used.\n";
-  llvm::errs() << LoadedSLocEntryTable.size()
-               << " loaded SLocEntries allocated, "
-               << MaxLoadedOffset - CurrentLoadedOffset
-               << "B of Sloc address space used.\n";
-
-  unsigned NumLineNumsComputed = 0;
-  unsigned NumFileBytesMapped = 0;
-  for (fileinfo_iterator I = fileinfo_begin(), E = fileinfo_end(); I != E; ++I){
-    NumLineNumsComputed += I->second->SourceLineCache != nullptr;
-    NumFileBytesMapped  += I->second->getSizeBytesMapped();
-  }
-  unsigned NumMacroArgsComputed = MacroArgsCacheMap.size();
-
-  llvm::errs() << NumFileBytesMapped << " bytes of files mapped, "
-               << NumLineNumsComputed << " files with line #'s computed, "
-               << NumMacroArgsComputed << " files with macro args computed.\n";
-  llvm::errs() << "FileID scans: " << NumLinearScans << " linear, "
-               << NumBinaryProbes << " binary.\n";
-}
-
-LLVM_DUMP_METHOD void SourceManager::dump() const {
-  llvm::raw_ostream &out = llvm::errs();
-
-  auto DumpSLocEntry = [&](int ID, const SrcMgr::SLocEntry &Entry,
-                           llvm::Optional<unsigned> NextStart) {
-    out << "SLocEntry <FileID " << ID << "> " << (Entry.isFile() ? "file" : "expansion")
-        << " <SourceLocation " << Entry.getOffset() << ":";
-    if (NextStart)
-      out << *NextStart << ">\n";
-    else
-      out << "???\?>\n";
-    if (Entry.isFile()) {
-      auto &FI = Entry.getFile();
-      if (FI.NumCreatedFIDs)
-        out << "  covers <FileID " << ID << ":" << int(ID + FI.NumCreatedFIDs)
-            << ">\n";
-      if (FI.getIncludeLoc().isValid())
-        out << "  included from " << FI.getIncludeLoc().getOffset() << "\n";
-      if (auto *CC = FI.getContentCache()) {
-        out << "  for " << (CC->OrigEntry ? CC->OrigEntry->getName() : "<none>")
-            << "\n";
-        if (CC->BufferOverridden)
-          out << "  contents overridden\n";
-        if (CC->ContentsEntry != CC->OrigEntry) {
-          out << "  contents from "
-              << (CC->ContentsEntry ? CC->ContentsEntry->getName() : "<none>")
-              << "\n";
-        }
-      }
-    } else {
-      auto &EI = Entry.getExpansion();
-      out << "  spelling from " << EI.getSpellingLoc().getOffset() << "\n";
-      out << "  macro " << (EI.isMacroArgExpansion() ? "arg" : "body")
-          << " range <" << EI.getExpansionLocStart().getOffset() << ":"
-          << EI.getExpansionLocEnd().getOffset() << ">\n";
-    }
-  };
-
-  // Dump local SLocEntries.
-  for (unsigned ID = 0, NumIDs = LocalSLocEntryTable.size(); ID != NumIDs; ++ID) {
-    DumpSLocEntry(ID, LocalSLocEntryTable[ID],
-                  ID == NumIDs - 1 ? NextLocalOffset
-                                   : LocalSLocEntryTable[ID + 1].getOffset());
-  }
-  // Dump loaded SLocEntries.
-  llvm::Optional<unsigned> NextStart;
-  for (unsigned Index = 0; Index != LoadedSLocEntryTable.size(); ++Index) {
-    int ID = -(int)Index - 2;
-    if (SLocEntryLoaded[Index]) {
-      DumpSLocEntry(ID, LoadedSLocEntryTable[Index], NextStart);
-      NextStart = LoadedSLocEntryTable[Index].getOffset();
-    } else {
-      NextStart = None;
-    }
-  }
-}
-
-ExternalSLocEntrySource::~ExternalSLocEntrySource() = default;
-
-/// Return the amount of memory used by memory buffers, breaking down
-/// by heap-backed versus mmap'ed memory.
-SourceManager::MemoryBufferSizes SourceManager::getMemoryBufferSizes() const {
-  size_t malloc_bytes = 0;
-  size_t mmap_bytes = 0;
-
-  for (unsigned i = 0, e = MemBufferInfos.size(); i != e; ++i)
-    if (size_t sized_mapped = MemBufferInfos[i]->getSizeBytesMapped())
-      switch (MemBufferInfos[i]->getMemoryBufferKind()) {
-        case llvm::MemoryBuffer::MemoryBuffer_MMap:
-          mmap_bytes += sized_mapped;
-          break;
-        case llvm::MemoryBuffer::MemoryBuffer_Malloc:
-          malloc_bytes += sized_mapped;
-          break;
-      }
-
-  return MemoryBufferSizes(malloc_bytes, mmap_bytes);
-}
-
-size_t SourceManager::getDataStructureSizes() const {
-  size_t size = llvm::capacity_in_bytes(MemBufferInfos)
-    + llvm::capacity_in_bytes(LocalSLocEntryTable)
-    + llvm::capacity_in_bytes(LoadedSLocEntryTable)
-    + llvm::capacity_in_bytes(SLocEntryLoaded)
-    + llvm::capacity_in_bytes(FileInfos);
-
-  if (OverriddenFilesInfo)
-    size += llvm::capacity_in_bytes(OverriddenFilesInfo->OverriddenFiles);
-
-  return size;
-}
-
-SourceManagerForFile::SourceManagerForFile(StringRef FileName,
-                                           StringRef Content) {
-  // This is referenced by `FileMgr` and will be released by `FileMgr` when it
-  // is deleted.
-  IntrusiveRefCntPtr<llvm::vfs::InMemoryFileSystem> InMemoryFileSystem(
-      new llvm::vfs::InMemoryFileSystem);
-  InMemoryFileSystem->addFile(
-      FileName, 0,
-      llvm::MemoryBuffer::getMemBuffer(Content, FileName,
-                                       /*RequiresNullTerminator=*/false));
-  // This is passed to `SM` as reference, so the pointer has to be referenced
-  // in `Environment` so that `FileMgr` can out-live this function scope.
-  FileMgr =
-      llvm::make_unique<FileManager>(FileSystemOptions(), InMemoryFileSystem);
-  // This is passed to `SM` as reference, so the pointer has to be referenced
-  // by `Environment` due to the same reason above.
-  Diagnostics = llvm::make_unique<DiagnosticsEngine>(
-      IntrusiveRefCntPtr<DiagnosticIDs>(new DiagnosticIDs),
-      new DiagnosticOptions);
-  SourceMgr = llvm::make_unique<SourceManager>(*Diagnostics, *FileMgr);
-  FileID ID = SourceMgr->createFileID(FileMgr->getFile(FileName),
-                                      SourceLocation(), clang::SrcMgr::C_User);
-  assert(ID.isValid());
-  SourceMgr->setMainFileID(ID);
-}