[clang] [clang-tools-extra] [NFC] Explicitly pass a VFS when creating DiagnosticsEngine (PR #115852)

kadir çetinkaya via cfe-commits cfe-commits at lists.llvm.org
Tue Nov 12 03:20:16 PST 2024


https://github.com/kadircet updated https://github.com/llvm/llvm-project/pull/115852

>From a999e3081d16170d510ab74222564fbcb4c6a7c2 Mon Sep 17 00:00:00 2001
From: Kadir Cetinkaya <kadircet at google.com>
Date: Tue, 12 Nov 2024 12:09:29 +0100
Subject: [PATCH 1/2] [NFC] Explicitly pass a VFS when creating
 DiagnosticsEngine

Starting with 41e3919ded78d8870f7c95e9181c7f7e29aa3cc4 DiagnosticsEngine
creation might perform IO. It was implicitly defaulting to
getRealFileSystem. This patch makes it explicit by pushing the decision
making to callers.

It uses ambient VFS if one is available, and keeps using
`getRealFileSystem` if there aren't any VFS.
---
 .../clang-include-fixer/IncludeFixer.cpp      |  3 +-
 clang-tools-extra/clangd/Compiler.cpp         |  6 ++--
 clang-tools-extra/clangd/ModulesBuilder.cpp   |  3 +-
 clang-tools-extra/clangd/Preamble.cpp         |  4 +--
 .../include-cleaner/unittests/RecordTest.cpp  | 19 ++++++-----
 .../include/clang/Frontend/CompilerInstance.h | 15 ++++++---
 clang/lib/Frontend/CompilerInstance.cpp       | 33 +++++++++----------
 .../CreateInvocationFromCommandLine.cpp       |  5 ++-
 .../lib/Frontend/Rewrite/FrontendActions.cpp  |  1 +
 clang/lib/Interpreter/Interpreter.cpp         |  3 +-
 .../StaticAnalyzer/Frontend/ModelInjector.cpp |  1 +
 clang/lib/Testing/TestAST.cpp                 | 32 +++++++++---------
 .../DependencyScanningWorker.cpp              |  5 +--
 clang/lib/Tooling/Tooling.cpp                 |  9 +++--
 clang/tools/c-index-test/core_main.cpp        |  9 +++--
 .../clang-import-test/clang-import-test.cpp   |  4 ++-
 .../clang-installapi/ClangInstallAPI.cpp      |  2 +-
 clang/tools/clang-scan-deps/ClangScanDeps.cpp |  7 ++--
 clang/tools/diagtool/ShowEnabledWarnings.cpp  |  4 ++-
 clang/tools/driver/cc1_main.cpp               |  3 +-
 clang/tools/libclang/CIndex.cpp               |  7 ++--
 clang/tools/libclang/Indexing.cpp             |  9 ++---
 clang/unittests/AST/ExternalASTSourceTest.cpp |  3 +-
 clang/unittests/CodeGen/TestCompiler.h        |  3 +-
 clang/unittests/Driver/DXCModeTest.cpp        |  3 +-
 clang/unittests/Driver/ToolChainTest.cpp      |  2 +-
 clang/unittests/Frontend/ASTUnitTest.cpp      | 17 ++++++----
 .../unittests/Frontend/CodeGenActionTest.cpp  |  7 ++--
 .../Frontend/CompilerInstanceTest.cpp         |  9 +++--
 .../Frontend/CompilerInvocationTest.cpp       |  7 ++--
 .../unittests/Frontend/FrontendActionTest.cpp | 14 ++++----
 clang/unittests/Frontend/OutputStreamTest.cpp |  5 ++-
 clang/unittests/Frontend/PCHPreambleTest.cpp  |  5 +--
 .../Frontend/ReparseWorkingDirTest.cpp        |  2 +-
 clang/unittests/Frontend/UtilsTest.cpp        |  6 ++--
 clang/unittests/Sema/SemaNoloadLookupTest.cpp |  7 ++--
 .../Serialization/ForceCheckFileInputTest.cpp | 15 +++++----
 .../Serialization/ModuleCacheTest.cpp         | 12 +++----
 .../Serialization/NoCommentsTest.cpp          |  6 ++--
 .../PreambleInNamedModulesTest.cpp            |  4 +--
 .../Serialization/VarDeclConstantInitTest.cpp |  6 ++--
 clang/unittests/Support/TimeProfilerTest.cpp  |  4 +--
 .../DependencyScannerTest.cpp                 |  3 +-
 clang/unittests/Tooling/ToolingTest.cpp       |  3 +-
 44 files changed, 192 insertions(+), 135 deletions(-)

diff --git a/clang-tools-extra/clang-include-fixer/IncludeFixer.cpp b/clang-tools-extra/clang-include-fixer/IncludeFixer.cpp
index 354f35cbadbeb9..bba8f8acc77da9 100644
--- a/clang-tools-extra/clang-include-fixer/IncludeFixer.cpp
+++ b/clang-tools-extra/clang-include-fixer/IncludeFixer.cpp
@@ -95,7 +95,8 @@ bool IncludeFixerActionFactory::runInvocation(
 
   // Create the compiler's actual diagnostics engine. We want to drop all
   // diagnostics here.
-  Compiler.createDiagnostics(new clang::IgnoringDiagConsumer,
+  Compiler.createDiagnostics(Files->getVirtualFileSystem(),
+                             new clang::IgnoringDiagConsumer,
                              /*ShouldOwnClient=*/true);
   Compiler.createSourceManager(*Files);
 
diff --git a/clang-tools-extra/clangd/Compiler.cpp b/clang-tools-extra/clangd/Compiler.cpp
index c60ab8e1b8062a..161cc9ae0ca365 100644
--- a/clang-tools-extra/clangd/Compiler.cpp
+++ b/clang-tools-extra/clangd/Compiler.cpp
@@ -110,8 +110,8 @@ buildCompilerInvocation(const ParseInputs &Inputs, clang::DiagnosticConsumer &D,
   CIOpts.VFS = Inputs.TFS->view(Inputs.CompileCommand.Directory);
   CIOpts.CC1Args = CC1Args;
   CIOpts.RecoverOnError = true;
-  CIOpts.Diags =
-      CompilerInstance::createDiagnostics(new DiagnosticOptions, &D, false);
+  CIOpts.Diags = CompilerInstance::createDiagnostics(
+      *CIOpts.VFS, new DiagnosticOptions, &D, false);
   CIOpts.ProbePrecompiled = false;
   std::unique_ptr<CompilerInvocation> CI = createInvocation(ArgStrs, CIOpts);
   if (!CI)
@@ -148,7 +148,7 @@ prepareCompilerInstance(std::unique_ptr<clang::CompilerInvocation> CI,
   auto Clang = std::make_unique<CompilerInstance>(
       std::make_shared<PCHContainerOperations>());
   Clang->setInvocation(std::move(CI));
-  Clang->createDiagnostics(&DiagsClient, false);
+  Clang->createDiagnostics(*VFS, &DiagsClient, false);
 
   if (auto VFSWithRemapping = createVFSFromCompilerInvocation(
           Clang->getInvocation(), Clang->getDiagnostics(), VFS))
diff --git a/clang-tools-extra/clangd/ModulesBuilder.cpp b/clang-tools-extra/clangd/ModulesBuilder.cpp
index 2bce3a20825616..29508901f85bba 100644
--- a/clang-tools-extra/clangd/ModulesBuilder.cpp
+++ b/clang-tools-extra/clangd/ModulesBuilder.cpp
@@ -188,7 +188,8 @@ bool IsModuleFileUpToDate(PathRef ModuleFilePath,
 
   clang::clangd::IgnoreDiagnostics IgnoreDiags;
   IntrusiveRefCntPtr<DiagnosticsEngine> Diags =
-      CompilerInstance::createDiagnostics(new DiagnosticOptions, &IgnoreDiags,
+      CompilerInstance::createDiagnostics(*VFS, new DiagnosticOptions,
+                                          &IgnoreDiags,
                                           /*ShouldOwnClient=*/false);
 
   LangOptions LangOpts;
diff --git a/clang-tools-extra/clangd/Preamble.cpp b/clang-tools-extra/clangd/Preamble.cpp
index c14c4d1ba103f8..ce88ec0eb88c1b 100644
--- a/clang-tools-extra/clangd/Preamble.cpp
+++ b/clang-tools-extra/clangd/Preamble.cpp
@@ -613,8 +613,9 @@ buildPreamble(PathRef FileName, CompilerInvocation CI,
         for (const auto &L : ASTListeners)
           L->sawDiagnostic(D, Diag);
       });
+  auto VFS = Inputs.TFS->view(Inputs.CompileCommand.Directory);
   llvm::IntrusiveRefCntPtr<DiagnosticsEngine> PreambleDiagsEngine =
-      CompilerInstance::createDiagnostics(&CI.getDiagnosticOpts(),
+      CompilerInstance::createDiagnostics(*VFS, &CI.getDiagnosticOpts(),
                                           &PreambleDiagnostics,
                                           /*ShouldOwnClient=*/false);
   const Config &Cfg = Config::current();
@@ -651,7 +652,6 @@ buildPreamble(PathRef FileName, CompilerInvocation CI,
         for (const auto &L : ASTListeners)
           L->beforeExecute(CI);
       });
-  auto VFS = Inputs.TFS->view(Inputs.CompileCommand.Directory);
   llvm::SmallString<32> AbsFileName(FileName);
   VFS->makeAbsolute(AbsFileName);
   auto StatCache = std::make_shared<PreambleFileStatusCache>(AbsFileName);
diff --git a/clang-tools-extra/include-cleaner/unittests/RecordTest.cpp b/clang-tools-extra/include-cleaner/unittests/RecordTest.cpp
index b5a7b9720903eb..b1bbb2eb82414c 100644
--- a/clang-tools-extra/include-cleaner/unittests/RecordTest.cpp
+++ b/clang-tools-extra/include-cleaner/unittests/RecordTest.cpp
@@ -609,15 +609,6 @@ TEST_F(PragmaIncludeTest, ExportInUnnamedBuffer) {
   )cpp";
   Inputs.ExtraFiles["foo.h"] = "";
 
-  auto Clang = std::make_unique<CompilerInstance>(
-      std::make_shared<PCHContainerOperations>());
-  Clang->createDiagnostics();
-
-  Clang->setInvocation(std::make_unique<CompilerInvocation>());
-  ASSERT_TRUE(CompilerInvocation::CreateFromArgs(
-      Clang->getInvocation(), {Filename.data()}, Clang->getDiagnostics(),
-      "clang"));
-
   // Create unnamed memory buffers for all the files.
   auto VFS = llvm::makeIntrusiveRefCnt<llvm::vfs::InMemoryFileSystem>();
   VFS->addFile(Filename, /*ModificationTime=*/0,
@@ -626,6 +617,16 @@ TEST_F(PragmaIncludeTest, ExportInUnnamedBuffer) {
     VFS->addFile(Extra.getKey(), /*ModificationTime=*/0,
                  llvm::MemoryBuffer::getMemBufferCopy(Extra.getValue(),
                                                       /*BufferName=*/""));
+
+  auto Clang = std::make_unique<CompilerInstance>(
+      std::make_shared<PCHContainerOperations>());
+  Clang->createDiagnostics(*VFS);
+
+  Clang->setInvocation(std::make_unique<CompilerInvocation>());
+  ASSERT_TRUE(CompilerInvocation::CreateFromArgs(
+      Clang->getInvocation(), {Filename.data()}, Clang->getDiagnostics(),
+      "clang"));
+
   auto *FM = Clang->createFileManager(VFS);
   ASSERT_TRUE(Clang->ExecuteAction(*Inputs.MakeAction()));
   EXPECT_THAT(
diff --git a/clang/include/clang/Frontend/CompilerInstance.h b/clang/include/clang/Frontend/CompilerInstance.h
index 338eb3c6bd028d..1220a4e29471d1 100644
--- a/clang/include/clang/Frontend/CompilerInstance.h
+++ b/clang/include/clang/Frontend/CompilerInstance.h
@@ -675,13 +675,17 @@ class CompilerInstance : public ModuleLoader {
   /// Note that this routine also replaces the diagnostic client,
   /// allocating one if one is not provided.
   ///
+  /// \param VFS is used for any IO needed when creating DiagnosticsEngine. It
+  /// doesn't replace VFS in the CompilerInstance (if any).
+  ///
   /// \param Client If non-NULL, a diagnostic client that will be
   /// attached to (and, then, owned by) the DiagnosticsEngine inside this AST
   /// unit.
   ///
   /// \param ShouldOwnClient If Client is non-NULL, specifies whether
   /// the diagnostic object should take ownership of the client.
-  void createDiagnostics(DiagnosticConsumer *Client = nullptr,
+  void createDiagnostics(llvm::vfs::FileSystem &VFS,
+                         DiagnosticConsumer *Client = nullptr,
                          bool ShouldOwnClient = true);
 
   /// Create a DiagnosticsEngine object with a the TextDiagnosticPrinter.
@@ -702,10 +706,11 @@ class CompilerInstance : public ModuleLoader {
   /// used by some diagnostics printers (for logging purposes only).
   ///
   /// \return The new object on success, or null on failure.
-  static IntrusiveRefCntPtr<DiagnosticsEngine> createDiagnostics(
-      DiagnosticOptions *Opts, DiagnosticConsumer *Client = nullptr,
-      bool ShouldOwnClient = true, const CodeGenOptions *CodeGenOpts = nullptr,
-      IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS = nullptr);
+  static IntrusiveRefCntPtr<DiagnosticsEngine>
+  createDiagnostics(llvm::vfs::FileSystem &VFS, DiagnosticOptions *Opts,
+                    DiagnosticConsumer *Client = nullptr,
+                    bool ShouldOwnClient = true,
+                    const CodeGenOptions *CodeGenOpts = nullptr);
 
   /// Create the file manager and replace any existing one with it.
   ///
diff --git a/clang/lib/Frontend/CompilerInstance.cpp b/clang/lib/Frontend/CompilerInstance.cpp
index ecc6782c7cb4fb..2569cf1bdf773b 100644
--- a/clang/lib/Frontend/CompilerInstance.cpp
+++ b/clang/lib/Frontend/CompilerInstance.cpp
@@ -332,23 +332,20 @@ static void SetupSerializedDiagnostics(DiagnosticOptions *DiagOpts,
   }
 }
 
-void CompilerInstance::createDiagnostics(DiagnosticConsumer *Client,
+void CompilerInstance::createDiagnostics(llvm::vfs::FileSystem &VFS,
+                                         DiagnosticConsumer *Client,
                                          bool ShouldOwnClient) {
-  Diagnostics = createDiagnostics(
-      &getDiagnosticOpts(), Client, ShouldOwnClient, &getCodeGenOpts(),
-      FileMgr ? FileMgr->getVirtualFileSystemPtr() : nullptr);
+  Diagnostics = createDiagnostics(VFS, &getDiagnosticOpts(), Client,
+                                  ShouldOwnClient, &getCodeGenOpts());
 }
 
 IntrusiveRefCntPtr<DiagnosticsEngine> CompilerInstance::createDiagnostics(
-    DiagnosticOptions *Opts, DiagnosticConsumer *Client, bool ShouldOwnClient,
-    const CodeGenOptions *CodeGenOpts,
-    llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS) {
+    llvm::vfs::FileSystem &VFS, DiagnosticOptions *Opts,
+    DiagnosticConsumer *Client, bool ShouldOwnClient,
+    const CodeGenOptions *CodeGenOpts) {
   IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
-  IntrusiveRefCntPtr<DiagnosticsEngine>
-      Diags(new DiagnosticsEngine(DiagID, Opts));
-
-  if (!VFS)
-    VFS = llvm::vfs::getRealFileSystem();
+  IntrusiveRefCntPtr<DiagnosticsEngine> Diags(
+      new DiagnosticsEngine(DiagID, Opts));
 
   // Create the diagnostic client for reporting errors or for
   // implementing -verify.
@@ -368,11 +365,10 @@ IntrusiveRefCntPtr<DiagnosticsEngine> CompilerInstance::createDiagnostics(
     SetUpDiagnosticLog(Opts, CodeGenOpts, *Diags);
 
   if (!Opts->DiagnosticSerializationFile.empty())
-    SetupSerializedDiagnostics(Opts, *Diags,
-                               Opts->DiagnosticSerializationFile);
+    SetupSerializedDiagnostics(Opts, *Diags, Opts->DiagnosticSerializationFile);
 
   // Configure our handling of diagnostics.
-  ProcessWarningOptions(*Diags, *Opts, *VFS);
+  ProcessWarningOptions(*Diags, *Opts, VFS);
 
   return Diags;
 }
@@ -1240,9 +1236,10 @@ compileModuleImpl(CompilerInstance &ImportingInstance, SourceLocation ImportLoc,
   auto &Inv = *Invocation;
   Instance.setInvocation(std::move(Invocation));
 
-  Instance.createDiagnostics(new ForwardingDiagnosticConsumer(
-                                   ImportingInstance.getDiagnosticClient()),
-                             /*ShouldOwnClient=*/true);
+  Instance.createDiagnostics(
+      ImportingInstance.getVirtualFileSystem(),
+      new ForwardingDiagnosticConsumer(ImportingInstance.getDiagnosticClient()),
+      /*ShouldOwnClient=*/true);
 
   if (llvm::is_contained(DiagOpts.SystemHeaderWarningsModules, ModuleName))
     Instance.getDiagnostics().setSuppressSystemWarnings(false);
diff --git a/clang/lib/Frontend/CreateInvocationFromCommandLine.cpp b/clang/lib/Frontend/CreateInvocationFromCommandLine.cpp
index 638757a2450240..d0b855fff2534c 100644
--- a/clang/lib/Frontend/CreateInvocationFromCommandLine.cpp
+++ b/clang/lib/Frontend/CreateInvocationFromCommandLine.cpp
@@ -22,6 +22,7 @@
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/Option/ArgList.h"
+#include "llvm/Support/VirtualFileSystem.h"
 #include "llvm/TargetParser/Host.h"
 using namespace clang;
 using namespace llvm::opt;
@@ -32,7 +33,9 @@ clang::createInvocation(ArrayRef<const char *> ArgList,
   assert(!ArgList.empty());
   auto Diags = Opts.Diags
                    ? std::move(Opts.Diags)
-                   : CompilerInstance::createDiagnostics(new DiagnosticOptions);
+                   : CompilerInstance::createDiagnostics(
+                         Opts.VFS ? *Opts.VFS : *llvm::vfs::getRealFileSystem(),
+                         new DiagnosticOptions);
 
   SmallVector<const char *, 16> Args(ArgList);
 
diff --git a/clang/lib/Frontend/Rewrite/FrontendActions.cpp b/clang/lib/Frontend/Rewrite/FrontendActions.cpp
index 6e1f949f543a51..5d2e1d78770959 100644
--- a/clang/lib/Frontend/Rewrite/FrontendActions.cpp
+++ b/clang/lib/Frontend/Rewrite/FrontendActions.cpp
@@ -247,6 +247,7 @@ class RewriteIncludesAction::RewriteImportsListener : public ASTReaderListener {
     Instance.setInvocation(
         std::make_shared<CompilerInvocation>(CI.getInvocation()));
     Instance.createDiagnostics(
+        CI.getVirtualFileSystem(),
         new ForwardingDiagnosticConsumer(CI.getDiagnosticClient()),
         /*ShouldOwnClient=*/true);
     Instance.getFrontendOpts().DisableFree = false;
diff --git a/clang/lib/Interpreter/Interpreter.cpp b/clang/lib/Interpreter/Interpreter.cpp
index 8eacbc6b713a19..26b174c36d3dcf 100644
--- a/clang/lib/Interpreter/Interpreter.cpp
+++ b/clang/lib/Interpreter/Interpreter.cpp
@@ -15,6 +15,7 @@
 #include "IncrementalExecutor.h"
 #include "IncrementalParser.h"
 #include "InterpreterUtils.h"
+#include "llvm/Support/VirtualFileSystem.h"
 #ifdef __EMSCRIPTEN__
 #include "Wasm.h"
 #endif // __EMSCRIPTEN__
@@ -104,7 +105,7 @@ CreateCI(const llvm::opt::ArgStringList &Argv) {
         CompilerInvocation::GetResourcesPath(Argv[0], nullptr);
 
   // Create the actual diagnostics engine.
-  Clang->createDiagnostics();
+  Clang->createDiagnostics(*llvm::vfs::getRealFileSystem());
   if (!Clang->hasDiagnostics())
     return llvm::createStringError(llvm::errc::not_supported,
                                    "Initialization failed. "
diff --git a/clang/lib/StaticAnalyzer/Frontend/ModelInjector.cpp b/clang/lib/StaticAnalyzer/Frontend/ModelInjector.cpp
index ae11fbbe32b762..168c73df393ffa 100644
--- a/clang/lib/StaticAnalyzer/Frontend/ModelInjector.cpp
+++ b/clang/lib/StaticAnalyzer/Frontend/ModelInjector.cpp
@@ -78,6 +78,7 @@ void ModelInjector::onBodySynthesis(const NamedDecl *D) {
   CompilerInstance Instance(CI.getPCHContainerOperations());
   Instance.setInvocation(std::move(Invocation));
   Instance.createDiagnostics(
+      CI.getVirtualFileSystem(),
       new ForwardingDiagnosticConsumer(CI.getDiagnosticClient()),
       /*ShouldOwnClient=*/true);
 
diff --git a/clang/lib/Testing/TestAST.cpp b/clang/lib/Testing/TestAST.cpp
index fe8b93851613dd..f7348aa068c51b 100644
--- a/clang/lib/Testing/TestAST.cpp
+++ b/clang/lib/Testing/TestAST.cpp
@@ -55,7 +55,7 @@ class StoreDiagnostics : public DiagnosticConsumer {
 // Provides "empty" ASTContext etc if we fail before parsing gets started.
 void createMissingComponents(CompilerInstance &Clang) {
   if (!Clang.hasDiagnostics())
-    Clang.createDiagnostics();
+    Clang.createDiagnostics(*llvm::vfs::getRealFileSystem());
   if (!Clang.hasFileManager())
     Clang.createFileManager();
   if (!Clang.hasSourceManager())
@@ -82,9 +82,24 @@ TestAST::TestAST(const TestInputs &In) {
   auto RecoverFromEarlyExit =
       llvm::make_scope_exit([&] { createMissingComponents(*Clang); });
 
+  std::string Filename = In.FileName;
+  if (Filename.empty())
+    Filename = getFilenameForTesting(In.Language).str();
+
+  // Set up a VFS with only the virtual file visible.
+  auto VFS = llvm::makeIntrusiveRefCnt<llvm::vfs::InMemoryFileSystem>();
+  if (auto Err = VFS->setCurrentWorkingDirectory(In.WorkingDir))
+    ADD_FAILURE() << "Failed to setWD: " << Err.message();
+  VFS->addFile(Filename, /*ModificationTime=*/0,
+               llvm::MemoryBuffer::getMemBufferCopy(In.Code, Filename));
+  for (const auto &Extra : In.ExtraFiles)
+    VFS->addFile(
+        Extra.getKey(), /*ModificationTime=*/0,
+        llvm::MemoryBuffer::getMemBufferCopy(Extra.getValue(), Extra.getKey()));
+
   // Extra error conditions are reported through diagnostics, set that up first.
   bool ErrorOK = In.ErrorOK || llvm::StringRef(In.Code).contains("error-ok");
-  Clang->createDiagnostics(new StoreDiagnostics(Diagnostics, !ErrorOK));
+  Clang->createDiagnostics(*VFS, new StoreDiagnostics(Diagnostics, !ErrorOK));
 
   // Parse cc1 argv, (typically [-std=c++20 input.cc]) into CompilerInvocation.
   std::vector<const char *> Argv;
@@ -93,9 +108,6 @@ TestAST::TestAST(const TestInputs &In) {
     Argv.push_back(S.c_str());
   for (const auto &S : In.ExtraArgs)
     Argv.push_back(S.c_str());
-  std::string Filename = In.FileName;
-  if (Filename.empty())
-    Filename = getFilenameForTesting(In.Language).str();
   Argv.push_back(Filename.c_str());
   Clang->setInvocation(std::make_unique<CompilerInvocation>());
   if (!CompilerInvocation::CreateFromArgs(Clang->getInvocation(), Argv,
@@ -105,16 +117,6 @@ TestAST::TestAST(const TestInputs &In) {
   }
   assert(!Clang->getInvocation().getFrontendOpts().DisableFree);
 
-  // Set up a VFS with only the virtual file visible.
-  auto VFS = llvm::makeIntrusiveRefCnt<llvm::vfs::InMemoryFileSystem>();
-  if (auto Err = VFS->setCurrentWorkingDirectory(In.WorkingDir))
-    ADD_FAILURE() << "Failed to setWD: " << Err.message();
-  VFS->addFile(Filename, /*ModificationTime=*/0,
-               llvm::MemoryBuffer::getMemBufferCopy(In.Code, Filename));
-  for (const auto &Extra : In.ExtraFiles)
-    VFS->addFile(
-        Extra.getKey(), /*ModificationTime=*/0,
-        llvm::MemoryBuffer::getMemBufferCopy(Extra.getValue(), Extra.getKey()));
   Clang->createFileManager(VFS);
 
   // Running the FrontendAction creates the other components: SourceManager,
diff --git a/clang/lib/Tooling/DependencyScanning/DependencyScanningWorker.cpp b/clang/lib/Tooling/DependencyScanning/DependencyScanningWorker.cpp
index fd1b7af0600da7..5a648df05e4fd3 100644
--- a/clang/lib/Tooling/DependencyScanning/DependencyScanningWorker.cpp
+++ b/clang/lib/Tooling/DependencyScanning/DependencyScanningWorker.cpp
@@ -322,7 +322,8 @@ class DependencyScanningAction : public tooling::ToolAction {
 
     // Create the compiler's actual diagnostics engine.
     sanitizeDiagOpts(ScanInstance.getDiagnosticOpts());
-    ScanInstance.createDiagnostics(DiagConsumer, /*ShouldOwnClient=*/false);
+    ScanInstance.createDiagnostics(DriverFileMgr->getVirtualFileSystem(),
+                                   DiagConsumer, /*ShouldOwnClient=*/false);
     if (!ScanInstance.hasDiagnostics())
       return false;
 
@@ -650,7 +651,7 @@ bool DependencyScanningWorker::computeDependencies(
   auto DiagOpts = CreateAndPopulateDiagOpts(FinalCCommandLine);
   sanitizeDiagOpts(*DiagOpts);
   IntrusiveRefCntPtr<DiagnosticsEngine> Diags =
-      CompilerInstance::createDiagnostics(DiagOpts.release(), &DC,
+      CompilerInstance::createDiagnostics(*FinalFS, DiagOpts.release(), &DC,
                                           /*ShouldOwnClient=*/false);
 
   // Although `Diagnostics` are used only for command-line parsing, the
diff --git a/clang/lib/Tooling/Tooling.cpp b/clang/lib/Tooling/Tooling.cpp
index ffacf9cf1f7829..88b7349ce8fed6 100644
--- a/clang/lib/Tooling/Tooling.cpp
+++ b/clang/lib/Tooling/Tooling.cpp
@@ -387,7 +387,8 @@ bool ToolInvocation::run() {
   TextDiagnosticPrinter DiagnosticPrinter(llvm::errs(), DiagOpts);
   IntrusiveRefCntPtr<DiagnosticsEngine> Diagnostics =
       CompilerInstance::createDiagnostics(
-          &*DiagOpts, DiagConsumer ? DiagConsumer : &DiagnosticPrinter, false);
+          Files->getVirtualFileSystem(), &*DiagOpts,
+          DiagConsumer ? DiagConsumer : &DiagnosticPrinter, false);
   // Although `Diagnostics` are used only for command-line parsing, the custom
   // `DiagConsumer` might expect a `SourceManager` to be present.
   SourceManager SrcMgr(*Diagnostics, *Files);
@@ -456,7 +457,8 @@ bool FrontendActionFactory::runInvocation(
   std::unique_ptr<FrontendAction> ScopedToolAction(create());
 
   // Create the compiler's actual diagnostics engine.
-  Compiler.createDiagnostics(DiagConsumer, /*ShouldOwnClient=*/false);
+  Compiler.createDiagnostics(Files->getVirtualFileSystem(), DiagConsumer,
+                             /*ShouldOwnClient=*/false);
   if (!Compiler.hasDiagnostics())
     return false;
 
@@ -652,7 +654,8 @@ class ASTBuilderAction : public ToolAction {
                      DiagnosticConsumer *DiagConsumer) override {
     std::unique_ptr<ASTUnit> AST = ASTUnit::LoadFromCompilerInvocation(
         Invocation, std::move(PCHContainerOps),
-        CompilerInstance::createDiagnostics(&Invocation->getDiagnosticOpts(),
+        CompilerInstance::createDiagnostics(Files->getVirtualFileSystem(),
+                                            &Invocation->getDiagnosticOpts(),
                                             DiagConsumer,
                                             /*ShouldOwnClient=*/false),
         Files);
diff --git a/clang/tools/c-index-test/core_main.cpp b/clang/tools/c-index-test/core_main.cpp
index c43bff21962118..327a77a09408ba 100644
--- a/clang/tools/c-index-test/core_main.cpp
+++ b/clang/tools/c-index-test/core_main.cpp
@@ -25,6 +25,7 @@
 #include "llvm/Support/Program.h"
 #include "llvm/Support/Signals.h"
 #include "llvm/Support/StringSaver.h"
+#include "llvm/Support/VirtualFileSystem.h"
 #include "llvm/Support/raw_ostream.h"
 
 using namespace clang;
@@ -219,8 +220,9 @@ static bool printSourceSymbols(const char *Executable,
   SmallVector<const char *, 4> ArgsWithProgName;
   ArgsWithProgName.push_back(Executable);
   ArgsWithProgName.append(Args.begin(), Args.end());
-  IntrusiveRefCntPtr<DiagnosticsEngine>
-    Diags(CompilerInstance::createDiagnostics(new DiagnosticOptions));
+  IntrusiveRefCntPtr<DiagnosticsEngine> Diags(
+      CompilerInstance::createDiagnostics(*llvm::vfs::getRealFileSystem(),
+                                          new DiagnosticOptions));
   CreateInvocationOptions CIOpts;
   CIOpts.Diags = Diags;
   CIOpts.ProbePrecompiled = true; // FIXME: historical default. Needed?
@@ -273,7 +275,8 @@ static bool printSourceSymbolsFromModule(StringRef modulePath,
   auto HSOpts = std::make_shared<HeaderSearchOptions>();
 
   IntrusiveRefCntPtr<DiagnosticsEngine> Diags =
-      CompilerInstance::createDiagnostics(new DiagnosticOptions());
+      CompilerInstance::createDiagnostics(*llvm::vfs::getRealFileSystem(),
+                                          new DiagnosticOptions());
   std::unique_ptr<ASTUnit> AU =
       ASTUnit::LoadFromASTFile(modulePath, *pchRdr, ASTUnit::LoadASTOnly, Diags,
                                FileSystemOpts, HSOpts, /*LangOpts=*/nullptr,
diff --git a/clang/tools/clang-import-test/clang-import-test.cpp b/clang/tools/clang-import-test/clang-import-test.cpp
index 2473e16a546dc0..41a8a63a2e22be 100644
--- a/clang/tools/clang-import-test/clang-import-test.cpp
+++ b/clang/tools/clang-import-test/clang-import-test.cpp
@@ -31,6 +31,7 @@
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Error.h"
 #include "llvm/Support/Signals.h"
+#include "llvm/Support/VirtualFileSystem.h"
 #include "llvm/TargetParser/Host.h"
 
 #include <memory>
@@ -164,7 +165,8 @@ std::unique_ptr<CompilerInstance> BuildCompilerInstance() {
   auto Ins = std::make_unique<CompilerInstance>();
   auto DC = std::make_unique<TestDiagnosticConsumer>();
   const bool ShouldOwnClient = true;
-  Ins->createDiagnostics(DC.release(), ShouldOwnClient);
+  Ins->createDiagnostics(*llvm::vfs::getRealFileSystem(), DC.release(),
+                         ShouldOwnClient);
 
   auto Inv = std::make_unique<CompilerInvocation>();
 
diff --git a/clang/tools/clang-installapi/ClangInstallAPI.cpp b/clang/tools/clang-installapi/ClangInstallAPI.cpp
index 308e5285e32578..ce6240b1b56f1e 100644
--- a/clang/tools/clang-installapi/ClangInstallAPI.cpp
+++ b/clang/tools/clang-installapi/ClangInstallAPI.cpp
@@ -113,7 +113,7 @@ static bool run(ArrayRef<const char *> Args, const char *ProgName) {
   // Set up compilation.
   std::unique_ptr<CompilerInstance> CI(new CompilerInstance());
   CI->setFileManager(FM.get());
-  CI->createDiagnostics();
+  CI->createDiagnostics(FM->getVirtualFileSystem());
   if (!CI->hasDiagnostics())
     return EXIT_FAILURE;
 
diff --git a/clang/tools/clang-scan-deps/ClangScanDeps.cpp b/clang/tools/clang-scan-deps/ClangScanDeps.cpp
index 9b30799c3ab263..58b56dcfd3bece 100644
--- a/clang/tools/clang-scan-deps/ClangScanDeps.cpp
+++ b/clang/tools/clang-scan-deps/ClangScanDeps.cpp
@@ -29,6 +29,7 @@
 #include "llvm/Support/ThreadPool.h"
 #include "llvm/Support/Threading.h"
 #include "llvm/Support/Timer.h"
+#include "llvm/Support/VirtualFileSystem.h"
 #include "llvm/TargetParser/Host.h"
 #include <mutex>
 #include <optional>
@@ -424,7 +425,8 @@ class FullDeps {
     IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts = new DiagnosticOptions{};
     TextDiagnosticPrinter DiagConsumer(ErrOS, &*DiagOpts);
     IntrusiveRefCntPtr<DiagnosticsEngine> Diags =
-        CompilerInstance::createDiagnostics(&*DiagOpts, &DiagConsumer,
+        CompilerInstance::createDiagnostics(*llvm::vfs::getRealFileSystem(),
+                                            &*DiagOpts, &DiagConsumer,
                                             /*ShouldOwnClient=*/false);
 
     for (auto &&M : Modules)
@@ -739,7 +741,8 @@ getCompilationDatabase(int argc, char **argv, std::string &ErrorMessage) {
         tooling::JSONCommandLineSyntax::AutoDetect);
 
   llvm::IntrusiveRefCntPtr<DiagnosticsEngine> Diags =
-      CompilerInstance::createDiagnostics(new DiagnosticOptions);
+      CompilerInstance::createDiagnostics(*llvm::vfs::getRealFileSystem(),
+                                          new DiagnosticOptions);
   driver::Driver TheDriver(CommandLine[0], llvm::sys::getDefaultTargetTriple(),
                            *Diags);
   TheDriver.setCheckInputsExist(false);
diff --git a/clang/tools/diagtool/ShowEnabledWarnings.cpp b/clang/tools/diagtool/ShowEnabledWarnings.cpp
index 66a295db054c35..48bed7c828c16b 100644
--- a/clang/tools/diagtool/ShowEnabledWarnings.cpp
+++ b/clang/tools/diagtool/ShowEnabledWarnings.cpp
@@ -14,6 +14,7 @@
 #include "clang/Frontend/TextDiagnosticPrinter.h"
 #include "clang/Frontend/Utils.h"
 #include "llvm/Support/TargetSelect.h"
+#include "llvm/Support/VirtualFileSystem.h"
 
 DEF_DIAGTOOL("show-enabled",
              "Show which warnings are enabled for a given command line",
@@ -74,7 +75,8 @@ createDiagnostics(unsigned int argc, char **argv) {
 
   // Build the diagnostics parser
   IntrusiveRefCntPtr<DiagnosticsEngine> FinalDiags =
-    CompilerInstance::createDiagnostics(&Invocation->getDiagnosticOpts());
+      CompilerInstance::createDiagnostics(*llvm::vfs::getRealFileSystem(),
+                                          &Invocation->getDiagnosticOpts());
   if (!FinalDiags)
     return nullptr;
 
diff --git a/clang/tools/driver/cc1_main.cpp b/clang/tools/driver/cc1_main.cpp
index 554dc956c7cfe3..d14058ff2c723d 100644
--- a/clang/tools/driver/cc1_main.cpp
+++ b/clang/tools/driver/cc1_main.cpp
@@ -45,6 +45,7 @@
 #include "llvm/Support/TargetSelect.h"
 #include "llvm/Support/TimeProfiler.h"
 #include "llvm/Support/Timer.h"
+#include "llvm/Support/VirtualFileSystem.h"
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/Target/TargetMachine.h"
 #include "llvm/TargetParser/AArch64TargetParser.h"
@@ -264,7 +265,7 @@ int cc1_main(ArrayRef<const char *> Argv, const char *Argv0, void *MainAddr) {
       CompilerInvocation::GetResourcesPath(Argv0, MainAddr);
 
   // Create the actual diagnostics engine.
-  Clang->createDiagnostics();
+  Clang->createDiagnostics(*llvm::vfs::getRealFileSystem());
   if (!Clang->hasDiagnostics())
     return 1;
 
diff --git a/clang/tools/libclang/CIndex.cpp b/clang/tools/libclang/CIndex.cpp
index 5475f7143db992..002e292ea3251c 100644
--- a/clang/tools/libclang/CIndex.cpp
+++ b/clang/tools/libclang/CIndex.cpp
@@ -59,6 +59,7 @@
 #include "llvm/Support/TargetSelect.h"
 #include "llvm/Support/Threading.h"
 #include "llvm/Support/Timer.h"
+#include "llvm/Support/VirtualFileSystem.h"
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/Support/thread.h"
 #include <mutex>
@@ -4084,7 +4085,8 @@ enum CXErrorCode clang_createTranslationUnit2(CXIndex CIdx,
   auto HSOpts = std::make_shared<HeaderSearchOptions>();
 
   IntrusiveRefCntPtr<DiagnosticsEngine> Diags =
-      CompilerInstance::createDiagnostics(new DiagnosticOptions());
+      CompilerInstance::createDiagnostics(*llvm::vfs::getRealFileSystem(),
+                                          new DiagnosticOptions());
   std::unique_ptr<ASTUnit> AU = ASTUnit::LoadFromASTFile(
       ast_filename, CXXIdx->getPCHContainerOperations()->getRawReader(),
       ASTUnit::LoadEverything, Diags, FileSystemOpts, HSOpts,
@@ -4157,7 +4159,8 @@ clang_parseTranslationUnit_Impl(CXIndex CIdx, const char *source_filename,
   std::unique_ptr<DiagnosticOptions> DiagOpts = CreateAndPopulateDiagOpts(
       llvm::ArrayRef(command_line_args, num_command_line_args));
   IntrusiveRefCntPtr<DiagnosticsEngine> Diags(
-      CompilerInstance::createDiagnostics(DiagOpts.release()));
+      CompilerInstance::createDiagnostics(*llvm::vfs::getRealFileSystem(),
+                                          DiagOpts.release()));
 
   if (options & CXTranslationUnit_KeepGoing)
     Diags->setFatalsAsError(true);
diff --git a/clang/tools/libclang/Indexing.cpp b/clang/tools/libclang/Indexing.cpp
index 05d88452209fb3..b890921972a0a7 100644
--- a/clang/tools/libclang/Indexing.cpp
+++ b/clang/tools/libclang/Indexing.cpp
@@ -29,6 +29,7 @@
 #include "clang/Lex/PreprocessorOptions.h"
 #include "llvm/Support/CrashRecoveryContext.h"
 #include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/VirtualFileSystem.h"
 #include <cstdio>
 #include <mutex>
 #include <utility>
@@ -479,10 +480,10 @@ static CXErrorCode clang_indexSourceFile_Impl(
     CaptureDiag = new CaptureDiagnosticConsumer();
 
   // Configure the diagnostics.
-  IntrusiveRefCntPtr<DiagnosticsEngine>
-    Diags(CompilerInstance::createDiagnostics(new DiagnosticOptions,
-                                              CaptureDiag,
-                                              /*ShouldOwnClient=*/true));
+  IntrusiveRefCntPtr<DiagnosticsEngine> Diags(
+      CompilerInstance::createDiagnostics(*llvm::vfs::getRealFileSystem(),
+                                          new DiagnosticOptions, CaptureDiag,
+                                          /*ShouldOwnClient=*/true));
 
   // Recover resources if we crash before exiting this function.
   llvm::CrashRecoveryContextCleanupRegistrar<DiagnosticsEngine,
diff --git a/clang/unittests/AST/ExternalASTSourceTest.cpp b/clang/unittests/AST/ExternalASTSourceTest.cpp
index 8b70be664e043c..2561485888f835 100644
--- a/clang/unittests/AST/ExternalASTSourceTest.cpp
+++ b/clang/unittests/AST/ExternalASTSourceTest.cpp
@@ -17,6 +17,7 @@
 #include "clang/Frontend/CompilerInvocation.h"
 #include "clang/Frontend/FrontendActions.h"
 #include "clang/Lex/PreprocessorOptions.h"
+#include "llvm/Support/VirtualFileSystem.h"
 #include "gtest/gtest.h"
 
 using namespace clang;
@@ -46,7 +47,7 @@ class TestFrontendAction : public ASTFrontendAction {
 bool testExternalASTSource(ExternalASTSource *Source,
                            StringRef FileContents) {
   CompilerInstance Compiler;
-  Compiler.createDiagnostics();
+  Compiler.createDiagnostics(*llvm::vfs::getRealFileSystem());
 
   auto Invocation = std::make_shared<CompilerInvocation>();
   Invocation->getPreprocessorOpts().addRemappedFile(
diff --git a/clang/unittests/CodeGen/TestCompiler.h b/clang/unittests/CodeGen/TestCompiler.h
index 891489cb511a4f..931c75effbf754 100644
--- a/clang/unittests/CodeGen/TestCompiler.h
+++ b/clang/unittests/CodeGen/TestCompiler.h
@@ -20,6 +20,7 @@
 #include "llvm/IR/Constants.h"
 #include "llvm/IR/LLVMContext.h"
 #include "llvm/IR/Module.h"
+#include "llvm/Support/VirtualFileSystem.h"
 #include "llvm/TargetParser/Host.h"
 
 namespace llvm {
@@ -35,7 +36,7 @@ struct TestCompiler {
                clang::CodeGenOptions CGO = clang::CodeGenOptions()) {
     compiler.getLangOpts() = LO;
     compiler.getCodeGenOpts() = CGO;
-    compiler.createDiagnostics();
+    compiler.createDiagnostics(*llvm::vfs::getRealFileSystem());
 
     std::string TrStr = llvm::Triple::normalize(llvm::sys::getProcessTriple());
     llvm::Triple Tr(TrStr);
diff --git a/clang/unittests/Driver/DXCModeTest.cpp b/clang/unittests/Driver/DXCModeTest.cpp
index 2a079a62f1bc13..616c07c0d389d1 100644
--- a/clang/unittests/Driver/DXCModeTest.cpp
+++ b/clang/unittests/Driver/DXCModeTest.cpp
@@ -219,7 +219,8 @@ TEST(DxcModeTest, DefaultEntry) {
   const char *Args[] = {"clang", "--driver-mode=dxc", "-Tcs_6_7", "foo.hlsl"};
 
   IntrusiveRefCntPtr<DiagnosticsEngine> Diags =
-      CompilerInstance::createDiagnostics(new DiagnosticOptions());
+      CompilerInstance::createDiagnostics(*InMemoryFileSystem,
+                                          new DiagnosticOptions());
 
   CreateInvocationOptions CIOpts;
   CIOpts.Diags = Diags;
diff --git a/clang/unittests/Driver/ToolChainTest.cpp b/clang/unittests/Driver/ToolChainTest.cpp
index 8542a168f93c27..0787e7d2d33391 100644
--- a/clang/unittests/Driver/ToolChainTest.cpp
+++ b/clang/unittests/Driver/ToolChainTest.cpp
@@ -577,7 +577,7 @@ TEST(CompilerInvocation, SplitSwarfSingleCrash) {
 
 TEST(ToolChainTest, UEFICallingConventionTest) {
   clang::CompilerInstance compiler;
-  compiler.createDiagnostics();
+  compiler.createDiagnostics(*llvm::vfs::getRealFileSystem());
 
   std::string TrStr = "x86_64-unknown-uefi";
   llvm::Triple Tr(TrStr);
diff --git a/clang/unittests/Frontend/ASTUnitTest.cpp b/clang/unittests/Frontend/ASTUnitTest.cpp
index bd5d5d00981807..e6524a019871dc 100644
--- a/clang/unittests/Frontend/ASTUnitTest.cpp
+++ b/clang/unittests/Frontend/ASTUnitTest.cpp
@@ -17,6 +17,7 @@
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/Path.h"
 #include "llvm/Support/ToolOutputFile.h"
+#include "llvm/Support/VirtualFileSystem.h"
 #include "gtest/gtest.h"
 
 using namespace llvm;
@@ -41,17 +42,18 @@ class ASTUnitTest : public ::testing::Test {
 
     const char *Args[] = {"clang", "-xc++", InputFileName.c_str()};
 
-    Diags = CompilerInstance::createDiagnostics(new DiagnosticOptions());
+    auto VFS = llvm::vfs::getRealFileSystem();
+    Diags = CompilerInstance::createDiagnostics(*VFS, new DiagnosticOptions());
 
     CreateInvocationOptions CIOpts;
     CIOpts.Diags = Diags;
+    CIOpts.VFS = VFS;
     CInvok = createInvocation(Args, std::move(CIOpts));
 
     if (!CInvok)
       return nullptr;
 
-    FileManager *FileMgr =
-        new FileManager(FileSystemOptions(), vfs::getRealFileSystem());
+    FileManager *FileMgr = new FileManager(FileSystemOptions(), VFS);
     PCHContainerOps = std::make_shared<PCHContainerOperations>();
 
     return ASTUnit::LoadFromCompilerInvocation(
@@ -134,7 +136,8 @@ TEST_F(ASTUnitTest, ModuleTextualHeader) {
 
   const char *Args[] = {"clang", "test.cpp", "-fmodule-map-file=m.modulemap",
                         "-fmodule-name=M"};
-  Diags = CompilerInstance::createDiagnostics(new DiagnosticOptions());
+  Diags =
+      CompilerInstance::createDiagnostics(*InMemoryFs, new DiagnosticOptions());
   CreateInvocationOptions CIOpts;
   CIOpts.Diags = Diags;
   CInvok = createInvocation(Args, std::move(CIOpts));
@@ -162,7 +165,8 @@ TEST_F(ASTUnitTest, LoadFromCommandLineEarlyError) {
 
   const char *Args[] = {"clang", "-target", "foobar", InputFileName.c_str()};
 
-  auto Diags = CompilerInstance::createDiagnostics(new DiagnosticOptions());
+  auto Diags = CompilerInstance::createDiagnostics(
+      *llvm::vfs::getRealFileSystem(), new DiagnosticOptions());
   auto PCHContainerOps = std::make_shared<PCHContainerOperations>();
   std::unique_ptr<clang::ASTUnit> ErrUnit;
 
@@ -189,7 +193,8 @@ TEST_F(ASTUnitTest, LoadFromCommandLineWorkingDirectory) {
   const char *Args[] = {"clang", "-working-directory", WorkingDir.c_str(),
                         InputFileName.c_str()};
 
-  auto Diags = CompilerInstance::createDiagnostics(new DiagnosticOptions());
+  auto Diags = CompilerInstance::createDiagnostics(
+      *llvm::vfs::getRealFileSystem(), new DiagnosticOptions());
   auto PCHContainerOps = std::make_shared<PCHContainerOperations>();
   std::unique_ptr<clang::ASTUnit> ErrUnit;
 
diff --git a/clang/unittests/Frontend/CodeGenActionTest.cpp b/clang/unittests/Frontend/CodeGenActionTest.cpp
index a6520910c83996..d855302ed05429 100644
--- a/clang/unittests/Frontend/CodeGenActionTest.cpp
+++ b/clang/unittests/Frontend/CodeGenActionTest.cpp
@@ -16,6 +16,7 @@
 #include "clang/Frontend/CompilerInstance.h"
 #include "clang/Lex/PreprocessorOptions.h"
 #include "llvm/Support/FormatVariadic.h"
+#include "llvm/Support/VirtualFileSystem.h"
 #include "gtest/gtest.h"
 
 using namespace llvm;
@@ -52,7 +53,7 @@ TEST(CodeGenTest, TestNullCodeGen) {
   Invocation->getTargetOpts().Triple = "i386-unknown-linux-gnu";
   CompilerInstance Compiler;
   Compiler.setInvocation(std::move(Invocation));
-  Compiler.createDiagnostics();
+  Compiler.createDiagnostics(*llvm::vfs::getRealFileSystem());
   EXPECT_TRUE(Compiler.hasDiagnostics());
 
   std::unique_ptr<FrontendAction> Act(new NullCodeGenAction);
@@ -70,7 +71,7 @@ TEST(CodeGenTest, CodeGenFromIRMemBuffer) {
   Invocation->getTargetOpts().Triple = "i386-unknown-linux-gnu";
   CompilerInstance Compiler;
   Compiler.setInvocation(std::move(Invocation));
-  Compiler.createDiagnostics();
+  Compiler.createDiagnostics(*llvm::vfs::getRealFileSystem());
   EXPECT_TRUE(Compiler.hasDiagnostics());
 
   EmitLLVMOnlyAction Action;
@@ -101,7 +102,7 @@ TEST(CodeGenTest, DebugInfoCWDCodeGen) {
   SmallString<256> IRBuffer;
   Compiler.setOutputStream(std::make_unique<raw_svector_ostream>(IRBuffer));
   Compiler.setInvocation(std::move(Invocation));
-  Compiler.createDiagnostics();
+  Compiler.createDiagnostics(*VFS);
   Compiler.createFileManager(std::move(VFS));
 
   EmitLLVMAction Action;
diff --git a/clang/unittests/Frontend/CompilerInstanceTest.cpp b/clang/unittests/Frontend/CompilerInstanceTest.cpp
index 5cf548e913cc10..07329eb299e293 100644
--- a/clang/unittests/Frontend/CompilerInstanceTest.cpp
+++ b/clang/unittests/Frontend/CompilerInstanceTest.cpp
@@ -13,6 +13,7 @@
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/Format.h"
 #include "llvm/Support/ToolOutputFile.h"
+#include "llvm/Support/VirtualFileSystem.h"
 #include "gtest/gtest.h"
 
 using namespace llvm;
@@ -53,7 +54,8 @@ TEST(CompilerInstance, DefaultVFSOverlayFromInvocation) {
   const char *Args[] = {"clang", VFSArg.c_str(), "-xc++", "-"};
 
   IntrusiveRefCntPtr<DiagnosticsEngine> Diags =
-      CompilerInstance::createDiagnostics(new DiagnosticOptions());
+      CompilerInstance::createDiagnostics(*llvm::vfs::getRealFileSystem(),
+                                          new DiagnosticOptions());
 
   CreateInvocationOptions CIOpts;
   CIOpts.Diags = Diags;
@@ -87,8 +89,9 @@ TEST(CompilerInstance, AllowDiagnosticLogWithUnownedDiagnosticConsumer) {
   auto DiagPrinter = std::make_unique<TextDiagnosticPrinter>(
       DiagnosticsOS, new DiagnosticOptions());
   CompilerInstance Instance;
-  IntrusiveRefCntPtr<DiagnosticsEngine> Diags = Instance.createDiagnostics(
-      DiagOpts, DiagPrinter.get(), /*ShouldOwnClient=*/false);
+  IntrusiveRefCntPtr<DiagnosticsEngine> Diags =
+      Instance.createDiagnostics(*llvm::vfs::getRealFileSystem(), DiagOpts,
+                                 DiagPrinter.get(), /*ShouldOwnClient=*/false);
 
   Diags->Report(diag::err_expected) << "no crash";
   ASSERT_EQ(DiagnosticOutput, "error: expected no crash\n");
diff --git a/clang/unittests/Frontend/CompilerInvocationTest.cpp b/clang/unittests/Frontend/CompilerInvocationTest.cpp
index 45478de5e6f7c8..4ff6824f1e21e3 100644
--- a/clang/unittests/Frontend/CompilerInvocationTest.cpp
+++ b/clang/unittests/Frontend/CompilerInvocationTest.cpp
@@ -12,6 +12,7 @@
 #include "clang/Frontend/TextDiagnosticBuffer.h"
 #include "clang/Lex/PreprocessorOptions.h"
 #include "clang/Serialization/ModuleFileExtension.h"
+#include "llvm/Support/VirtualFileSystem.h"
 #include "llvm/TargetParser/Host.h"
 
 #include "gmock/gmock.h"
@@ -38,9 +39,9 @@ class CommandLineTest : public ::testing::Test {
   }
 
   CommandLineTest()
-      : Diags(CompilerInstance::createDiagnostics(new DiagnosticOptions(),
-                                                  new TextDiagnosticBuffer())) {
-  }
+      : Diags(CompilerInstance::createDiagnostics(
+            *llvm::vfs::getRealFileSystem(), new DiagnosticOptions(),
+            new TextDiagnosticBuffer())) {}
 };
 
 template <typename M>
diff --git a/clang/unittests/Frontend/FrontendActionTest.cpp b/clang/unittests/Frontend/FrontendActionTest.cpp
index 818e8cef27e51b..099d6d66c874ee 100644
--- a/clang/unittests/Frontend/FrontendActionTest.cpp
+++ b/clang/unittests/Frontend/FrontendActionTest.cpp
@@ -20,6 +20,7 @@
 #include "clang/Serialization/InMemoryModuleCache.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/ToolOutputFile.h"
+#include "llvm/Support/VirtualFileSystem.h"
 #include "llvm/TargetParser/Triple.h"
 #include "gtest/gtest.h"
 
@@ -90,7 +91,7 @@ TEST(ASTFrontendAction, Sanity) {
   invocation->getTargetOpts().Triple = "i386-unknown-linux-gnu";
   CompilerInstance compiler;
   compiler.setInvocation(std::move(invocation));
-  compiler.createDiagnostics();
+  compiler.createDiagnostics(*llvm::vfs::getRealFileSystem());
 
   TestASTFrontendAction test_action;
   ASSERT_TRUE(compiler.ExecuteAction(test_action));
@@ -110,7 +111,7 @@ TEST(ASTFrontendAction, IncrementalParsing) {
   invocation->getTargetOpts().Triple = "i386-unknown-linux-gnu";
   CompilerInstance compiler;
   compiler.setInvocation(std::move(invocation));
-  compiler.createDiagnostics();
+  compiler.createDiagnostics(*llvm::vfs::getRealFileSystem());
 
   TestASTFrontendAction test_action(/*enableIncrementalProcessing=*/true);
   ASSERT_TRUE(compiler.ExecuteAction(test_action));
@@ -137,7 +138,7 @@ TEST(ASTFrontendAction, LateTemplateIncrementalParsing) {
   invocation->getTargetOpts().Triple = "i386-unknown-linux-gnu";
   CompilerInstance compiler;
   compiler.setInvocation(std::move(invocation));
-  compiler.createDiagnostics();
+  compiler.createDiagnostics(*llvm::vfs::getRealFileSystem());
 
   TestASTFrontendAction test_action(/*enableIncrementalProcessing=*/true,
                                     /*actOnEndOfTranslationUnit=*/true);
@@ -183,7 +184,7 @@ TEST(PreprocessorFrontendAction, EndSourceFile) {
   Invocation->getTargetOpts().Triple = "i386-unknown-linux-gnu";
   CompilerInstance Compiler;
   Compiler.setInvocation(std::move(Invocation));
-  Compiler.createDiagnostics();
+  Compiler.createDiagnostics(*llvm::vfs::getRealFileSystem());
 
   TestPPCallbacks *Callbacks = new TestPPCallbacks;
   TestPPCallbacksFrontendAction TestAction(Callbacks);
@@ -245,7 +246,8 @@ TEST(ASTFrontendAction, ExternalSemaSource) {
   CompilerInstance Compiler;
   Compiler.setInvocation(std::move(Invocation));
   auto *TDC = new TypoDiagnosticConsumer;
-  Compiler.createDiagnostics(TDC, /*ShouldOwnClient=*/true);
+  Compiler.createDiagnostics(*llvm::vfs::getRealFileSystem(), TDC,
+                             /*ShouldOwnClient=*/true);
   Compiler.setExternalSemaSource(new TypoExternalSemaSource(Compiler));
 
   SyntaxOnlyAction TestAction;
@@ -277,7 +279,7 @@ TEST(GeneratePCHFrontendAction, CacheGeneratedPCH) {
     Invocation->getTargetOpts().Triple = "x86_64-apple-darwin19.0.0";
     CompilerInstance Compiler;
     Compiler.setInvocation(std::move(Invocation));
-    Compiler.createDiagnostics();
+    Compiler.createDiagnostics(*llvm::vfs::getRealFileSystem());
 
     GeneratePCHAction TestAction;
     ASSERT_TRUE(Compiler.ExecuteAction(TestAction));
diff --git a/clang/unittests/Frontend/OutputStreamTest.cpp b/clang/unittests/Frontend/OutputStreamTest.cpp
index 2618558c7e11ee..fa5d726d252903 100644
--- a/clang/unittests/Frontend/OutputStreamTest.cpp
+++ b/clang/unittests/Frontend/OutputStreamTest.cpp
@@ -13,6 +13,7 @@
 #include "clang/Frontend/TextDiagnosticPrinter.h"
 #include "clang/FrontendTool/Utils.h"
 #include "clang/Lex/PreprocessorOptions.h"
+#include "llvm/Support/VirtualFileSystem.h"
 #include "gtest/gtest.h"
 
 using namespace llvm;
@@ -37,7 +38,7 @@ TEST(FrontendOutputTests, TestOutputStream) {
 
   Compiler.setOutputStream(std::move(IRStream));
   Compiler.setInvocation(std::move(Invocation));
-  Compiler.createDiagnostics();
+  Compiler.createDiagnostics(*llvm::vfs::getRealFileSystem());
 
   bool Success = ExecuteCompilerInvocation(&Compiler);
   EXPECT_TRUE(Success);
@@ -62,6 +63,7 @@ TEST(FrontendOutputTests, TestVerboseOutputStreamShared) {
   Compiler.setInvocation(std::move(Invocation));
   IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts = new DiagnosticOptions();
   Compiler.createDiagnostics(
+      *llvm::vfs::getRealFileSystem(),
       new TextDiagnosticPrinter(llvm::nulls(), &*DiagOpts), true);
   Compiler.setVerboseOutputStream(VerboseStream);
 
@@ -91,6 +93,7 @@ TEST(FrontendOutputTests, TestVerboseOutputStreamOwned) {
     Compiler.setInvocation(std::move(Invocation));
     IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts = new DiagnosticOptions();
     Compiler.createDiagnostics(
+        *llvm::vfs::getRealFileSystem(),
         new TextDiagnosticPrinter(llvm::nulls(), &*DiagOpts), true);
     Compiler.setVerboseOutputStream(std::move(VerboseStream));
 
diff --git a/clang/unittests/Frontend/PCHPreambleTest.cpp b/clang/unittests/Frontend/PCHPreambleTest.cpp
index 2ce24c91ac0f13..58ec2e2ce70589 100644
--- a/clang/unittests/Frontend/PCHPreambleTest.cpp
+++ b/clang/unittests/Frontend/PCHPreambleTest.cpp
@@ -94,8 +94,9 @@ class PCHPreambleTest : public ::testing::Test {
     PreprocessorOptions &PPOpts = CI->getPreprocessorOpts();
     PPOpts.RemappedFilesKeepOriginalName = true;
 
-    IntrusiveRefCntPtr<DiagnosticsEngine>
-      Diags(CompilerInstance::createDiagnostics(new DiagnosticOptions, new DiagnosticConsumer));
+    IntrusiveRefCntPtr<DiagnosticsEngine> Diags(
+        CompilerInstance::createDiagnostics(*VFS, new DiagnosticOptions,
+                                            new DiagnosticConsumer));
 
     FileManager *FileMgr = new FileManager(FSOpts, VFS);
 
diff --git a/clang/unittests/Frontend/ReparseWorkingDirTest.cpp b/clang/unittests/Frontend/ReparseWorkingDirTest.cpp
index ca7ce23dd64b22..b0f2d51b80b9e7 100644
--- a/clang/unittests/Frontend/ReparseWorkingDirTest.cpp
+++ b/clang/unittests/Frontend/ReparseWorkingDirTest.cpp
@@ -58,7 +58,7 @@ class ReparseWorkingDirTest : public ::testing::Test {
     CI->getTargetOpts().Triple = "i386-unknown-linux-gnu";
 
     IntrusiveRefCntPtr<DiagnosticsEngine> Diags(
-        CompilerInstance::createDiagnostics(new DiagnosticOptions,
+        CompilerInstance::createDiagnostics(*VFS, new DiagnosticOptions,
                                             new DiagnosticConsumer));
 
     FileManager *FileMgr = new FileManager(CI->getFileSystemOpts(), VFS);
diff --git a/clang/unittests/Frontend/UtilsTest.cpp b/clang/unittests/Frontend/UtilsTest.cpp
index ae014d3f86b5aa..304fbe2a8e69f0 100644
--- a/clang/unittests/Frontend/UtilsTest.cpp
+++ b/clang/unittests/Frontend/UtilsTest.cpp
@@ -28,9 +28,9 @@ TEST(BuildCompilerInvocationTest, RecoverMultipleJobs) {
   clang::IgnoringDiagConsumer D;
   CreateInvocationOptions Opts;
   Opts.RecoverOnError = true;
-  Opts.Diags = clang::CompilerInstance::createDiagnostics(new DiagnosticOptions,
-                                                          &D, false);
   Opts.VFS = new llvm::vfs::InMemoryFileSystem();
+  Opts.Diags = clang::CompilerInstance::createDiagnostics(
+      *Opts.VFS, new DiagnosticOptions, &D, false);
   std::unique_ptr<CompilerInvocation> CI = createInvocation(Args, Opts);
   ASSERT_TRUE(CI);
   EXPECT_THAT(CI->TargetOpts->Triple, testing::StartsWith("i386-"));
@@ -46,7 +46,7 @@ TEST(BuildCompilerInvocationTest, ProbePrecompiled) {
 
   clang::IgnoringDiagConsumer D;
   llvm::IntrusiveRefCntPtr<DiagnosticsEngine> CommandLineDiagsEngine =
-      clang::CompilerInstance::createDiagnostics(new DiagnosticOptions, &D,
+      clang::CompilerInstance::createDiagnostics(*FS, new DiagnosticOptions, &D,
                                                  false);
   // Default: ProbePrecompiled=false
   CreateInvocationOptions CIOpts;
diff --git a/clang/unittests/Sema/SemaNoloadLookupTest.cpp b/clang/unittests/Sema/SemaNoloadLookupTest.cpp
index cf89c7331e4e0f..a8e1bb0bd2c5de 100644
--- a/clang/unittests/Sema/SemaNoloadLookupTest.cpp
+++ b/clang/unittests/Sema/SemaNoloadLookupTest.cpp
@@ -57,11 +57,12 @@ class NoloadLookupTest : public ::testing::Test {
     std::string FileName = llvm::Twine(ModuleName + ".cppm").str();
     addFile(FileName, Contents);
 
-    IntrusiveRefCntPtr<DiagnosticsEngine> Diags =
-        CompilerInstance::createDiagnostics(new DiagnosticOptions());
     CreateInvocationOptions CIOpts;
+    CIOpts.VFS = llvm::vfs::getRealFileSystem();
+    IntrusiveRefCntPtr<DiagnosticsEngine> Diags =
+        CompilerInstance::createDiagnostics(*CIOpts.VFS,
+                                            new DiagnosticOptions());
     CIOpts.Diags = Diags;
-    CIOpts.VFS = llvm::vfs::createPhysicalFileSystem();
 
     std::string CacheBMIPath =
         llvm::Twine(TestDir + "/" + ModuleName + ".pcm").str();
diff --git a/clang/unittests/Serialization/ForceCheckFileInputTest.cpp b/clang/unittests/Serialization/ForceCheckFileInputTest.cpp
index ad8892b8c8be1e..6a839d1bf9350b 100644
--- a/clang/unittests/Serialization/ForceCheckFileInputTest.cpp
+++ b/clang/unittests/Serialization/ForceCheckFileInputTest.cpp
@@ -63,12 +63,14 @@ export int aa = 43;
   std::string BMIPath = llvm::Twine(TestDir + "/a.pcm").str();
 
   {
-    IntrusiveRefCntPtr<DiagnosticsEngine> Diags =
-        CompilerInstance::createDiagnostics(new DiagnosticOptions());
     CreateInvocationOptions CIOpts;
-    CIOpts.Diags = Diags;
     CIOpts.VFS = llvm::vfs::createPhysicalFileSystem();
 
+    IntrusiveRefCntPtr<DiagnosticsEngine> Diags =
+        CompilerInstance::createDiagnostics(*CIOpts.VFS,
+                                            new DiagnosticOptions());
+    CIOpts.Diags = Diags;
+
     const char *Args[] = {"clang++",       "-std=c++20",
                           "--precompile",  "-working-directory",
                           TestDir.c_str(), "a.cppm"};
@@ -103,11 +105,12 @@ export int aa = 43;
   }
 
   {
-    IntrusiveRefCntPtr<DiagnosticsEngine> Diags =
-        CompilerInstance::createDiagnostics(new DiagnosticOptions());
     CreateInvocationOptions CIOpts;
-    CIOpts.Diags = Diags;
     CIOpts.VFS = llvm::vfs::createPhysicalFileSystem();
+    IntrusiveRefCntPtr<DiagnosticsEngine> Diags =
+        CompilerInstance::createDiagnostics(*CIOpts.VFS,
+                                            new DiagnosticOptions());
+    CIOpts.Diags = Diags;
 
     std::string BMIPath = llvm::Twine(TestDir + "/a.pcm").str();
     const char *Args[] = {
diff --git a/clang/unittests/Serialization/ModuleCacheTest.cpp b/clang/unittests/Serialization/ModuleCacheTest.cpp
index a7ca98549b4125..6ceee1c6536cb5 100644
--- a/clang/unittests/Serialization/ModuleCacheTest.cpp
+++ b/clang/unittests/Serialization/ModuleCacheTest.cpp
@@ -106,11 +106,11 @@ TEST_F(ModuleCacheTest, CachedModuleNewPath) {
 
   SmallString<256> MCPArg("-fmodules-cache-path=");
   MCPArg.append(ModuleCachePath);
-  IntrusiveRefCntPtr<DiagnosticsEngine> Diags =
-      CompilerInstance::createDiagnostics(new DiagnosticOptions());
   CreateInvocationOptions CIOpts;
-  CIOpts.Diags = Diags;
   CIOpts.VFS = llvm::vfs::createPhysicalFileSystem();
+  IntrusiveRefCntPtr<DiagnosticsEngine> Diags =
+      CompilerInstance::createDiagnostics(*CIOpts.VFS, new DiagnosticOptions());
+  CIOpts.Diags = Diags;
 
   // First run should pass with no errors
   const char *Args[] = {"clang",        "-fmodules",          "-Fframeworks",
@@ -156,11 +156,11 @@ TEST_F(ModuleCacheTest, CachedModuleNewPathAllowErrors) {
 
   SmallString<256> MCPArg("-fmodules-cache-path=");
   MCPArg.append(ModuleCachePath);
-  IntrusiveRefCntPtr<DiagnosticsEngine> Diags =
-      CompilerInstance::createDiagnostics(new DiagnosticOptions());
   CreateInvocationOptions CIOpts;
-  CIOpts.Diags = Diags;
   CIOpts.VFS = llvm::vfs::createPhysicalFileSystem();
+  IntrusiveRefCntPtr<DiagnosticsEngine> Diags =
+      CompilerInstance::createDiagnostics(*CIOpts.VFS, new DiagnosticOptions());
+  CIOpts.Diags = Diags;
 
   // First run should pass with no errors
   const char *Args[] = {"clang",        "-fmodules",          "-Fframeworks",
diff --git a/clang/unittests/Serialization/NoCommentsTest.cpp b/clang/unittests/Serialization/NoCommentsTest.cpp
index a0a564aeff9a15..a1fb23404e4154 100644
--- a/clang/unittests/Serialization/NoCommentsTest.cpp
+++ b/clang/unittests/Serialization/NoCommentsTest.cpp
@@ -83,11 +83,11 @@ export module Comments;
 void foo() {}
   )cpp");
 
-  IntrusiveRefCntPtr<DiagnosticsEngine> Diags =
-      CompilerInstance::createDiagnostics(new DiagnosticOptions());
   CreateInvocationOptions CIOpts;
-  CIOpts.Diags = Diags;
   CIOpts.VFS = llvm::vfs::createPhysicalFileSystem();
+  IntrusiveRefCntPtr<DiagnosticsEngine> Diags =
+      CompilerInstance::createDiagnostics(*CIOpts.VFS, new DiagnosticOptions());
+  CIOpts.Diags = Diags;
 
   std::string CacheBMIPath = llvm::Twine(TestDir + "/Comments.pcm").str();
   const char *Args[] = {"clang++",       "-std=c++20",
diff --git a/clang/unittests/Serialization/PreambleInNamedModulesTest.cpp b/clang/unittests/Serialization/PreambleInNamedModulesTest.cpp
index d26e1cb633654f..cf317eddb0f373 100644
--- a/clang/unittests/Serialization/PreambleInNamedModulesTest.cpp
+++ b/clang/unittests/Serialization/PreambleInNamedModulesTest.cpp
@@ -75,10 +75,10 @@ export using ::E;
   )cpp",
           MainFilePath);
 
-  IntrusiveRefCntPtr<DiagnosticsEngine> Diags =
-      CompilerInstance::createDiagnostics(new DiagnosticOptions());
   IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS =
       llvm::vfs::createPhysicalFileSystem();
+  IntrusiveRefCntPtr<DiagnosticsEngine> Diags =
+      CompilerInstance::createDiagnostics(*VFS, new DiagnosticOptions());
 
   CreateInvocationOptions CIOpts;
   CIOpts.Diags = Diags;
diff --git a/clang/unittests/Serialization/VarDeclConstantInitTest.cpp b/clang/unittests/Serialization/VarDeclConstantInitTest.cpp
index 5cbbfb9ff003b3..14c0c30add2078 100644
--- a/clang/unittests/Serialization/VarDeclConstantInitTest.cpp
+++ b/clang/unittests/Serialization/VarDeclConstantInitTest.cpp
@@ -90,11 +90,11 @@ export namespace Fibonacci
 }
   )cpp");
 
-  IntrusiveRefCntPtr<DiagnosticsEngine> Diags =
-      CompilerInstance::createDiagnostics(new DiagnosticOptions());
   CreateInvocationOptions CIOpts;
-  CIOpts.Diags = Diags;
   CIOpts.VFS = llvm::vfs::createPhysicalFileSystem();
+  IntrusiveRefCntPtr<DiagnosticsEngine> Diags =
+      CompilerInstance::createDiagnostics(*CIOpts.VFS, new DiagnosticOptions());
+  CIOpts.Diags = Diags;
 
   const char *Args[] = {"clang++",       "-std=c++20",
                         "--precompile",  "-working-directory",
diff --git a/clang/unittests/Support/TimeProfilerTest.cpp b/clang/unittests/Support/TimeProfilerTest.cpp
index 339b470153e64e..995ebf625b7ab2 100644
--- a/clang/unittests/Support/TimeProfilerTest.cpp
+++ b/clang/unittests/Support/TimeProfilerTest.cpp
@@ -45,8 +45,6 @@ std::string teardownProfiler() {
 // We only parse AST here. This is enough for constexpr evaluation.
 bool compileFromString(StringRef Code, StringRef Standard, StringRef File,
                        llvm::StringMap<std::string> Headers = {}) {
-  CompilerInstance Compiler;
-  Compiler.createDiagnostics();
 
   llvm::IntrusiveRefCntPtr<llvm::vfs::InMemoryFileSystem> FS(
       new llvm::vfs::InMemoryFileSystem());
@@ -57,6 +55,8 @@ bool compileFromString(StringRef Code, StringRef Standard, StringRef File,
   }
   llvm::IntrusiveRefCntPtr<FileManager> Files(
       new FileManager(FileSystemOptions(), FS));
+  CompilerInstance Compiler;
+  Compiler.createDiagnostics(Files->getVirtualFileSystem());
   Compiler.setFileManager(Files.get());
 
   auto Invocation = std::make_shared<CompilerInvocation>();
diff --git a/clang/unittests/Tooling/DependencyScanning/DependencyScannerTest.cpp b/clang/unittests/Tooling/DependencyScanning/DependencyScannerTest.cpp
index ec0e143be4a209..e1c47708059920 100644
--- a/clang/unittests/Tooling/DependencyScanning/DependencyScannerTest.cpp
+++ b/clang/unittests/Tooling/DependencyScanning/DependencyScannerTest.cpp
@@ -60,7 +60,8 @@ class TestDependencyScanningAction : public tooling::ToolAction {
     Compiler.setInvocation(std::move(Invocation));
     Compiler.setFileManager(FileMgr);
 
-    Compiler.createDiagnostics(DiagConsumer, /*ShouldOwnClient=*/false);
+    Compiler.createDiagnostics(FileMgr->getVirtualFileSystem(), DiagConsumer,
+                               /*ShouldOwnClient=*/false);
     if (!Compiler.hasDiagnostics())
       return false;
 
diff --git a/clang/unittests/Tooling/ToolingTest.cpp b/clang/unittests/Tooling/ToolingTest.cpp
index f41a44fa0922a1..0b65577a05193f 100644
--- a/clang/unittests/Tooling/ToolingTest.cpp
+++ b/clang/unittests/Tooling/ToolingTest.cpp
@@ -384,7 +384,8 @@ struct CommandLineExtractorTest : public ::testing::Test {
 public:
   CommandLineExtractorTest()
       : InMemoryFS(new llvm::vfs::InMemoryFileSystem),
-        Diags(CompilerInstance::createDiagnostics(new DiagnosticOptions)),
+        Diags(CompilerInstance::createDiagnostics(*InMemoryFS,
+                                                  new DiagnosticOptions)),
         Driver("clang", llvm::sys::getDefaultTargetTriple(), *Diags,
                "clang LLVM compiler", overlayRealFS(InMemoryFS)) {}
 

>From efcb23c27bdf55add246fff5695859892282ebea Mon Sep 17 00:00:00 2001
From: Kadir Cetinkaya <kadircet at google.com>
Date: Tue, 12 Nov 2024 12:19:56 +0100
Subject: [PATCH 2/2] format

---
 clang/unittests/AST/ExternalASTSourceTest.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/clang/unittests/AST/ExternalASTSourceTest.cpp b/clang/unittests/AST/ExternalASTSourceTest.cpp
index 2561485888f835..8e1bde1247f660 100644
--- a/clang/unittests/AST/ExternalASTSourceTest.cpp
+++ b/clang/unittests/AST/ExternalASTSourceTest.cpp
@@ -10,9 +10,9 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "clang/AST/ExternalASTSource.h"
 #include "clang/AST/ASTConsumer.h"
 #include "clang/AST/ASTContext.h"
-#include "clang/AST/ExternalASTSource.h"
 #include "clang/Frontend/CompilerInstance.h"
 #include "clang/Frontend/CompilerInvocation.h"
 #include "clang/Frontend/FrontendActions.h"



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