[Lldb-commits] [clang] [clang-tools-extra] [libcxx] [lldb] [llvm] Add clang basic module directory (PR #93388)

David Stone via lldb-commits lldb-commits at lists.llvm.org
Sat May 25 17:14:59 PDT 2024


https://github.com/davidstone created https://github.com/llvm/llvm-project/pull/93388

Depends on https://github.com/llvm/llvm-project/pull/67930

>From 0933b8e0f3161c0037516f677f1de2e72811d921 Mon Sep 17 00:00:00 2001
From: David Stone <davidfromonline at gmail.com>
Date: Sat, 25 May 2024 14:13:30 -0600
Subject: [PATCH 1/2] [clang][Modules] Move `ASTSourceDescriptor` into its own
 file

---
 .../include/clang/Basic/ASTSourceDescriptor.h | 52 +++++++++++++++++++
 clang/include/clang/Basic/Module.h            | 26 ----------
 clang/lib/AST/ExternalASTSource.cpp           |  2 +-
 clang/lib/Basic/ASTSourceDescriptor.cpp       | 33 ++++++++++++
 clang/lib/Basic/CMakeLists.txt                |  1 +
 clang/lib/Basic/Module.cpp                    | 15 ------
 clang/lib/CodeGen/CGDebugInfo.h               |  3 +-
 clang/lib/Serialization/ASTReader.cpp         |  1 +
 .../Plugins/ExpressionParser/Clang/ASTUtils.h |  8 ++-
 .../Clang/ClangExternalASTSourceCallbacks.cpp |  1 +
 .../Clang/ClangExternalASTSourceCallbacks.h   |  8 ++-
 11 files changed, 105 insertions(+), 45 deletions(-)
 create mode 100644 clang/include/clang/Basic/ASTSourceDescriptor.h
 create mode 100644 clang/lib/Basic/ASTSourceDescriptor.cpp

diff --git a/clang/include/clang/Basic/ASTSourceDescriptor.h b/clang/include/clang/Basic/ASTSourceDescriptor.h
new file mode 100644
index 0000000000000..175e0551db765
--- /dev/null
+++ b/clang/include/clang/Basic/ASTSourceDescriptor.h
@@ -0,0 +1,52 @@
+//===- ASTSourceDescriptor.h -----------------------------*- C++ -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+/// \file
+/// Defines the clang::ASTSourceDescriptor class, which abstracts clang modules
+/// and precompiled header files
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_BASIC_ASTSOURCEDESCRIPTOR_H
+#define LLVM_CLANG_BASIC_ASTSOURCEDESCRIPTOR_H
+
+#include "clang/Basic/Module.h"
+#include "llvm/ADT/StringRef.h"
+#include <string>
+#include <utility>
+
+namespace clang {
+
+/// Abstracts clang modules and precompiled header files and holds
+/// everything needed to generate debug info for an imported module
+/// or PCH.
+class ASTSourceDescriptor {
+  StringRef PCHModuleName;
+  StringRef Path;
+  StringRef ASTFile;
+  ASTFileSignature Signature;
+  Module *ClangModule = nullptr;
+
+public:
+  ASTSourceDescriptor() = default;
+  ASTSourceDescriptor(StringRef Name, StringRef Path, StringRef ASTFile,
+                      ASTFileSignature Signature)
+      : PCHModuleName(std::move(Name)), Path(std::move(Path)),
+        ASTFile(std::move(ASTFile)), Signature(Signature) {}
+  ASTSourceDescriptor(Module &M);
+
+  std::string getModuleName() const;
+  StringRef getPath() const { return Path; }
+  StringRef getASTFile() const { return ASTFile; }
+  ASTFileSignature getSignature() const { return Signature; }
+  Module *getModuleOrNull() const { return ClangModule; }
+};
+
+} // namespace clang
+
+#endif // LLVM_CLANG_BASIC_ASTSOURCEDESCRIPTOR_H
diff --git a/clang/include/clang/Basic/Module.h b/clang/include/clang/Basic/Module.h
index 2d62d05cd9190..e86f4303d732b 100644
--- a/clang/include/clang/Basic/Module.h
+++ b/clang/include/clang/Basic/Module.h
@@ -868,32 +868,6 @@ class VisibleModuleSet {
   unsigned Generation = 0;
 };
 
-/// Abstracts clang modules and precompiled header files and holds
-/// everything needed to generate debug info for an imported module
-/// or PCH.
-class ASTSourceDescriptor {
-  StringRef PCHModuleName;
-  StringRef Path;
-  StringRef ASTFile;
-  ASTFileSignature Signature;
-  Module *ClangModule = nullptr;
-
-public:
-  ASTSourceDescriptor() = default;
-  ASTSourceDescriptor(StringRef Name, StringRef Path, StringRef ASTFile,
-                      ASTFileSignature Signature)
-      : PCHModuleName(std::move(Name)), Path(std::move(Path)),
-        ASTFile(std::move(ASTFile)), Signature(Signature) {}
-  ASTSourceDescriptor(Module &M);
-
-  std::string getModuleName() const;
-  StringRef getPath() const { return Path; }
-  StringRef getASTFile() const { return ASTFile; }
-  ASTFileSignature getSignature() const { return Signature; }
-  Module *getModuleOrNull() const { return ClangModule; }
-};
-
-
 } // namespace clang
 
 #endif // LLVM_CLANG_BASIC_MODULE_H
diff --git a/clang/lib/AST/ExternalASTSource.cpp b/clang/lib/AST/ExternalASTSource.cpp
index e96a474968511..a5b6f80bde694 100644
--- a/clang/lib/AST/ExternalASTSource.cpp
+++ b/clang/lib/AST/ExternalASTSource.cpp
@@ -15,10 +15,10 @@
 #include "clang/AST/ExternalASTSource.h"
 #include "clang/AST/ASTContext.h"
 #include "clang/AST/DeclarationName.h"
+#include "clang/Basic/ASTSourceDescriptor.h"
 #include "clang/Basic/FileManager.h"
 #include "clang/Basic/IdentifierTable.h"
 #include "clang/Basic/LLVM.h"
-#include "clang/Basic/Module.h"
 #include "clang/Basic/SourceManager.h"
 #include "llvm/Support/ErrorHandling.h"
 #include <cstdint>
diff --git a/clang/lib/Basic/ASTSourceDescriptor.cpp b/clang/lib/Basic/ASTSourceDescriptor.cpp
new file mode 100644
index 0000000000000..8072c08a51d3a
--- /dev/null
+++ b/clang/lib/Basic/ASTSourceDescriptor.cpp
@@ -0,0 +1,33 @@
+//===- ASTSourceDescriptor.cpp -------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+/// Defines the clang::ASTSourceDescriptor class, which abstracts clang modules
+/// and precompiled header files
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Basic/ASTSourceDescriptor.h"
+
+namespace clang {
+
+ASTSourceDescriptor::ASTSourceDescriptor(Module &M)
+    : Signature(M.Signature), ClangModule(&M) {
+  if (M.Directory)
+    Path = M.Directory->getName();
+  if (auto File = M.getASTFile())
+    ASTFile = File->getName();
+}
+
+std::string ASTSourceDescriptor::getModuleName() const {
+  if (ClangModule)
+    return ClangModule->Name;
+  else
+    return std::string(PCHModuleName);
+}
+
+} // namespace clang
diff --git a/clang/lib/Basic/CMakeLists.txt b/clang/lib/Basic/CMakeLists.txt
index 824d4a0e2eee5..f30680552e0f5 100644
--- a/clang/lib/Basic/CMakeLists.txt
+++ b/clang/lib/Basic/CMakeLists.txt
@@ -55,6 +55,7 @@ if(CLANG_VENDOR)
 endif()
 
 add_clang_library(clangBasic
+  ASTSourceDescriptor.cpp
   Attributes.cpp
   Builtins.cpp
   CLWarnings.cpp
diff --git a/clang/lib/Basic/Module.cpp b/clang/lib/Basic/Module.cpp
index 045ef580f9c33..90b7b0d24bb6a 100644
--- a/clang/lib/Basic/Module.cpp
+++ b/clang/lib/Basic/Module.cpp
@@ -724,18 +724,3 @@ void VisibleModuleSet::setVisible(Module *M, SourceLocation Loc,
   };
   VisitModule({M, nullptr});
 }
-
-ASTSourceDescriptor::ASTSourceDescriptor(Module &M)
-    : Signature(M.Signature), ClangModule(&M) {
-  if (M.Directory)
-    Path = M.Directory->getName();
-  if (auto File = M.getASTFile())
-    ASTFile = File->getName();
-}
-
-std::string ASTSourceDescriptor::getModuleName() const {
-  if (ClangModule)
-    return ClangModule->Name;
-  else
-    return std::string(PCHModuleName);
-}
diff --git a/clang/lib/CodeGen/CGDebugInfo.h b/clang/lib/CodeGen/CGDebugInfo.h
index d6db4d711366a..8fe738be21568 100644
--- a/clang/lib/CodeGen/CGDebugInfo.h
+++ b/clang/lib/CodeGen/CGDebugInfo.h
@@ -20,8 +20,8 @@
 #include "clang/AST/PrettyPrinter.h"
 #include "clang/AST/Type.h"
 #include "clang/AST/TypeOrdering.h"
+#include "clang/Basic/ASTSourceDescriptor.h"
 #include "clang/Basic/CodeGenOptions.h"
-#include "clang/Basic/Module.h"
 #include "clang/Basic/SourceLocation.h"
 #include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/DenseSet.h"
@@ -38,6 +38,7 @@ class MDNode;
 namespace clang {
 class ClassTemplateSpecializationDecl;
 class GlobalDecl;
+class Module;
 class ModuleMap;
 class ObjCInterfaceDecl;
 class UsingDecl;
diff --git a/clang/lib/Serialization/ASTReader.cpp b/clang/lib/Serialization/ASTReader.cpp
index d7fc6697eaf74..389ac4ed76240 100644
--- a/clang/lib/Serialization/ASTReader.cpp
+++ b/clang/lib/Serialization/ASTReader.cpp
@@ -40,6 +40,7 @@
 #include "clang/AST/TypeLoc.h"
 #include "clang/AST/TypeLocVisitor.h"
 #include "clang/AST/UnresolvedSet.h"
+#include "clang/Basic/ASTSourceDescriptor.h"
 #include "clang/Basic/CommentOptions.h"
 #include "clang/Basic/Diagnostic.h"
 #include "clang/Basic/DiagnosticError.h"
diff --git a/lldb/source/Plugins/ExpressionParser/Clang/ASTUtils.h b/lldb/source/Plugins/ExpressionParser/Clang/ASTUtils.h
index 17f1506036c69..da2b1a15f7461 100644
--- a/lldb/source/Plugins/ExpressionParser/Clang/ASTUtils.h
+++ b/lldb/source/Plugins/ExpressionParser/Clang/ASTUtils.h
@@ -9,13 +9,19 @@
 #ifndef LLDB_SOURCE_PLUGINS_EXPRESSIONPARSER_CLANG_ASTUTILS_H
 #define LLDB_SOURCE_PLUGINS_EXPRESSIONPARSER_CLANG_ASTUTILS_H
 
-#include "clang/Basic/Module.h"
+#include "clang/Basic/ASTSourceDescriptor.h"
 #include "clang/Sema/Lookup.h"
 #include "clang/Sema/MultiplexExternalSemaSource.h"
 #include "clang/Sema/Sema.h"
 #include "clang/Sema/SemaConsumer.h"
 #include <optional>
 
+namespace clang {
+
+class Module;
+
+} // namespace clang
+
 namespace lldb_private {
 
 /// Wraps an ExternalASTSource into an ExternalSemaSource. Doesn't take
diff --git a/lldb/source/Plugins/ExpressionParser/Clang/ClangExternalASTSourceCallbacks.cpp b/lldb/source/Plugins/ExpressionParser/Clang/ClangExternalASTSourceCallbacks.cpp
index 89d9ac042e57a..e746e6afe39be 100644
--- a/lldb/source/Plugins/ExpressionParser/Clang/ClangExternalASTSourceCallbacks.cpp
+++ b/lldb/source/Plugins/ExpressionParser/Clang/ClangExternalASTSourceCallbacks.cpp
@@ -11,6 +11,7 @@
 
 #include "clang/AST/Decl.h"
 #include "clang/AST/DeclObjC.h"
+#include "clang/Basic/Module.h"
 #include <optional>
 
 using namespace lldb_private;
diff --git a/lldb/source/Plugins/ExpressionParser/Clang/ClangExternalASTSourceCallbacks.h b/lldb/source/Plugins/ExpressionParser/Clang/ClangExternalASTSourceCallbacks.h
index 219ed641615eb..6bd18186a567d 100644
--- a/lldb/source/Plugins/ExpressionParser/Clang/ClangExternalASTSourceCallbacks.h
+++ b/lldb/source/Plugins/ExpressionParser/Clang/ClangExternalASTSourceCallbacks.h
@@ -10,9 +10,15 @@
 #define LLDB_SOURCE_PLUGINS_EXPRESSIONPARSER_CLANG_CLANGEXTERNALASTSOURCECALLBACKS_H
 
 #include "Plugins/TypeSystem/Clang/TypeSystemClang.h"
-#include "clang/Basic/Module.h"
+#include "clang/Basic/ASTSourceDescriptor.h"
 #include <optional>
 
+namespace clang {
+
+class Module;
+
+} // namespace clang
+
 namespace lldb_private {
 
 class ClangExternalASTSourceCallbacks : public clang::ExternalASTSource {

>From 9be7409d8d246a24432faf7d5c238d6c0e1763d9 Mon Sep 17 00:00:00 2001
From: David Stone <davidfromonline at gmail.com>
Date: Sat, 25 May 2024 15:17:41 -0600
Subject: [PATCH 2/2] Add `clang/include/clang/Basic/Module` and
 `clang/lib/Basic/Module` directories.

Move `Module.h` / `Module.cpp` and `ASTSourceDescriptor.h` / `ASTSourceDescriptor.cpp` into them.
---
 .github/new-prs-labeler.yml                   |   2 +-
 .../clangd/unittests/ReplayPeambleTests.cpp   |   2 +-
 clang/docs/Modules.rst                        |   2 +-
 .../include/clang/APINotes/APINotesManager.h  |   2 +-
 .../include/clang/Basic/ASTSourceDescriptor.h |   2 +-
 .../clang/Basic/Module/ASTSourceDescriptor.h  |  52 ++
 .../include/clang/Basic/{ => Module}/Module.h |   0
 .../clang/ExtractAPI/ExtractAPIVisitor.h      |   2 +-
 .../Serialization/SymbolGraphSerializer.h     |   2 +-
 clang/include/clang/Lex/ModuleLoader.h        |   2 +-
 clang/include/clang/Lex/ModuleMap.h           |   2 +-
 clang/include/clang/Lex/Preprocessor.h        |   2 +-
 clang/include/clang/Sema/Sema.h               |   2 +-
 clang/include/clang/Serialization/ASTWriter.h |   2 +-
 .../include/clang/Serialization/ModuleFile.h  |   2 +-
 .../clang/Serialization/ModuleManager.h       |   2 +-
 .../Serialization/PCHContainerOperations.h    |   2 +-
 clang/lib/AST/ASTContext.cpp                  |   2 +-
 clang/lib/AST/ASTDumper.cpp                   |   2 +-
 clang/lib/AST/Decl.cpp                        |   2 +-
 clang/lib/AST/DeclBase.cpp                    |   2 +-
 clang/lib/AST/DeclPrinter.cpp                 |   2 +-
 clang/lib/AST/ExternalASTSource.cpp           |   2 +-
 clang/lib/AST/ItaniumMangle.cpp               |   2 +-
 clang/lib/AST/ODRDiagsEmitter.cpp             |   2 +-
 clang/lib/AST/TextNodeDumper.cpp              |   2 +-
 clang/lib/Basic/CMakeLists.txt                |  14 +-
 clang/lib/Basic/Module.cpp                    |   2 +-
 .../{ => Module}/ASTSourceDescriptor.cpp      |   2 +-
 clang/lib/Basic/Module/Module.cpp             | 726 ++++++++++++++++++
 clang/lib/CodeGen/CGDebugInfo.h               |   2 +-
 clang/lib/CodeGen/CodeGenModule.cpp           |   2 +-
 clang/lib/CodeGen/CodeGenModule.h             |   2 +-
 clang/lib/ExtractAPI/API.cpp                  |   2 +-
 .../TypedefUnderlyingTypeResolver.cpp         |   2 +-
 clang/lib/Frontend/ASTUnit.cpp                |   2 +-
 clang/lib/Frontend/FrontendActions.cpp        |   2 +-
 clang/lib/Lex/HeaderSearch.cpp                |   2 +-
 clang/lib/Lex/ModuleMap.cpp                   |   2 +-
 clang/lib/Lex/PPDirectives.cpp                |   2 +-
 clang/lib/Lex/Pragma.cpp                      |   2 +-
 clang/lib/Lex/Preprocessor.cpp                |   2 +-
 clang/lib/Serialization/ASTReader.cpp         |   4 +-
 clang/lib/Serialization/ASTReaderDecl.cpp     |   2 +-
 clang/lib/Serialization/ASTWriter.cpp         |   2 +-
 .../header_exportable_declarations.cpp        |   2 +-
 .../Plugins/ExpressionParser/Clang/ASTUtils.h |   2 +-
 .../Clang/ClangExternalASTSourceCallbacks.cpp |   2 +-
 .../Clang/ClangExternalASTSourceCallbacks.h   |   2 +-
 49 files changed, 831 insertions(+), 53 deletions(-)
 create mode 100644 clang/include/clang/Basic/Module/ASTSourceDescriptor.h
 rename clang/include/clang/Basic/{ => Module}/Module.h (100%)
 rename clang/lib/Basic/{ => Module}/ASTSourceDescriptor.cpp (94%)
 create mode 100644 clang/lib/Basic/Module/Module.cpp

diff --git a/.github/new-prs-labeler.yml b/.github/new-prs-labeler.yml
index a57ba28faf160..41325b2ff2e24 100644
--- a/.github/new-prs-labeler.yml
+++ b/.github/new-prs-labeler.yml
@@ -345,7 +345,7 @@ clang:modules:
   - clang/include/clang/AST/PropertiesBase.td
   - clang/include/clang/AST/ODRHash.h
   - clang/include/clang/AST/TypeProperties.td
-  - clang/include/clang/Basic/Module.h
+  - clang/include/clang/Basic/Module/**
   - clang/include/clang/Frontend/PrecompiledPreamble.h
   - clang/include/clang/Lex/ModuleLoader.h
   - clang/include/clang/Lex/ModuleMap.h
diff --git a/clang-tools-extra/clangd/unittests/ReplayPeambleTests.cpp b/clang-tools-extra/clangd/unittests/ReplayPeambleTests.cpp
index 147d9abe69137..c650f9b8440c2 100644
--- a/clang-tools-extra/clangd/unittests/ReplayPeambleTests.cpp
+++ b/clang-tools-extra/clangd/unittests/ReplayPeambleTests.cpp
@@ -25,7 +25,7 @@
 #include "clang/AST/DeclTemplate.h"
 #include "clang/Basic/FileEntry.h"
 #include "clang/Basic/LLVM.h"
-#include "clang/Basic/Module.h"
+#include "clang/Basic/Module/Module.h"
 #include "clang/Basic/SourceLocation.h"
 #include "clang/Basic/SourceManager.h"
 #include "clang/Basic/TokenKinds.h"
diff --git a/clang/docs/Modules.rst b/clang/docs/Modules.rst
index 06294e3c58a4f..79c87250ad0d5 100644
--- a/clang/docs/Modules.rst
+++ b/clang/docs/Modules.rst
@@ -1126,7 +1126,7 @@ The Clang source code provides additional information about modules:
 ``clang/test/Modules/``
   Tests specifically related to modules functionality.
 
-``clang/include/clang/Basic/Module.h``
+``clang/include/clang/Basic/Module/Module.h``
   The ``Module`` class in this header describes a module, and is used throughout the compiler to implement modules.
 
 ``clang/include/clang/Lex/ModuleMap.h``
diff --git a/clang/include/clang/APINotes/APINotesManager.h b/clang/include/clang/APINotes/APINotesManager.h
index 18375c9e51a17..d9a133941f6b4 100644
--- a/clang/include/clang/APINotes/APINotesManager.h
+++ b/clang/include/clang/APINotes/APINotesManager.h
@@ -9,7 +9,7 @@
 #ifndef LLVM_CLANG_APINOTES_APINOTESMANAGER_H
 #define LLVM_CLANG_APINOTES_APINOTESMANAGER_H
 
-#include "clang/Basic/Module.h"
+#include "clang/Basic/Module/Module.h"
 #include "clang/Basic/SourceLocation.h"
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/DenseMap.h"
diff --git a/clang/include/clang/Basic/ASTSourceDescriptor.h b/clang/include/clang/Basic/ASTSourceDescriptor.h
index 175e0551db765..32fc9d4856cbe 100644
--- a/clang/include/clang/Basic/ASTSourceDescriptor.h
+++ b/clang/include/clang/Basic/ASTSourceDescriptor.h
@@ -15,7 +15,7 @@
 #ifndef LLVM_CLANG_BASIC_ASTSOURCEDESCRIPTOR_H
 #define LLVM_CLANG_BASIC_ASTSOURCEDESCRIPTOR_H
 
-#include "clang/Basic/Module.h"
+#include "clang/Basic/Module/Module.h"
 #include "llvm/ADT/StringRef.h"
 #include <string>
 #include <utility>
diff --git a/clang/include/clang/Basic/Module/ASTSourceDescriptor.h b/clang/include/clang/Basic/Module/ASTSourceDescriptor.h
new file mode 100644
index 0000000000000..32fc9d4856cbe
--- /dev/null
+++ b/clang/include/clang/Basic/Module/ASTSourceDescriptor.h
@@ -0,0 +1,52 @@
+//===- ASTSourceDescriptor.h -----------------------------*- C++ -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+/// \file
+/// Defines the clang::ASTSourceDescriptor class, which abstracts clang modules
+/// and precompiled header files
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_BASIC_ASTSOURCEDESCRIPTOR_H
+#define LLVM_CLANG_BASIC_ASTSOURCEDESCRIPTOR_H
+
+#include "clang/Basic/Module/Module.h"
+#include "llvm/ADT/StringRef.h"
+#include <string>
+#include <utility>
+
+namespace clang {
+
+/// Abstracts clang modules and precompiled header files and holds
+/// everything needed to generate debug info for an imported module
+/// or PCH.
+class ASTSourceDescriptor {
+  StringRef PCHModuleName;
+  StringRef Path;
+  StringRef ASTFile;
+  ASTFileSignature Signature;
+  Module *ClangModule = nullptr;
+
+public:
+  ASTSourceDescriptor() = default;
+  ASTSourceDescriptor(StringRef Name, StringRef Path, StringRef ASTFile,
+                      ASTFileSignature Signature)
+      : PCHModuleName(std::move(Name)), Path(std::move(Path)),
+        ASTFile(std::move(ASTFile)), Signature(Signature) {}
+  ASTSourceDescriptor(Module &M);
+
+  std::string getModuleName() const;
+  StringRef getPath() const { return Path; }
+  StringRef getASTFile() const { return ASTFile; }
+  ASTFileSignature getSignature() const { return Signature; }
+  Module *getModuleOrNull() const { return ClangModule; }
+};
+
+} // namespace clang
+
+#endif // LLVM_CLANG_BASIC_ASTSOURCEDESCRIPTOR_H
diff --git a/clang/include/clang/Basic/Module.h b/clang/include/clang/Basic/Module/Module.h
similarity index 100%
rename from clang/include/clang/Basic/Module.h
rename to clang/include/clang/Basic/Module/Module.h
diff --git a/clang/include/clang/ExtractAPI/ExtractAPIVisitor.h b/clang/include/clang/ExtractAPI/ExtractAPIVisitor.h
index 8ccebe457ed53..e1fe750328bec 100644
--- a/clang/include/clang/ExtractAPI/ExtractAPIVisitor.h
+++ b/clang/include/clang/ExtractAPI/ExtractAPIVisitor.h
@@ -21,7 +21,7 @@
 #include "clang/AST/DeclTemplate.h"
 #include "clang/AST/ParentMapContext.h"
 #include "clang/AST/RecursiveASTVisitor.h"
-#include "clang/Basic/Module.h"
+#include "clang/Basic/Module/Module.h"
 #include "clang/Basic/SourceManager.h"
 #include "clang/Basic/Specifiers.h"
 #include "clang/ExtractAPI/API.h"
diff --git a/clang/include/clang/ExtractAPI/Serialization/SymbolGraphSerializer.h b/clang/include/clang/ExtractAPI/Serialization/SymbolGraphSerializer.h
index 27e9167ca1ad0..6560556a7d422 100644
--- a/clang/include/clang/ExtractAPI/Serialization/SymbolGraphSerializer.h
+++ b/clang/include/clang/ExtractAPI/Serialization/SymbolGraphSerializer.h
@@ -17,7 +17,7 @@
 #ifndef LLVM_CLANG_EXTRACTAPI_SERIALIZATION_SYMBOLGRAPHSERIALIZER_H
 #define LLVM_CLANG_EXTRACTAPI_SERIALIZATION_SYMBOLGRAPHSERIALIZER_H
 
-#include "clang/Basic/Module.h"
+#include "clang/Basic/Module/Module.h"
 #include "clang/ExtractAPI/API.h"
 #include "clang/ExtractAPI/APIIgnoresList.h"
 #include "clang/ExtractAPI/Serialization/APISetVisitor.h"
diff --git a/clang/include/clang/Lex/ModuleLoader.h b/clang/include/clang/Lex/ModuleLoader.h
index f880a9091a2ed..43318571ef822 100644
--- a/clang/include/clang/Lex/ModuleLoader.h
+++ b/clang/include/clang/Lex/ModuleLoader.h
@@ -15,7 +15,7 @@
 #define LLVM_CLANG_LEX_MODULELOADER_H
 
 #include "clang/Basic/LLVM.h"
-#include "clang/Basic/Module.h"
+#include "clang/Basic/Module/Module.h"
 #include "clang/Basic/SourceLocation.h"
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/PointerIntPair.h"
diff --git a/clang/include/clang/Lex/ModuleMap.h b/clang/include/clang/Lex/ModuleMap.h
index 2e28ff6823cb2..1a1f246b76155 100644
--- a/clang/include/clang/Lex/ModuleMap.h
+++ b/clang/include/clang/Lex/ModuleMap.h
@@ -16,7 +16,7 @@
 
 #include "clang/Basic/IdentifierTable.h"
 #include "clang/Basic/LangOptions.h"
-#include "clang/Basic/Module.h"
+#include "clang/Basic/Module/Module.h"
 #include "clang/Basic/SourceLocation.h"
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/DenseMap.h"
diff --git a/clang/include/clang/Lex/Preprocessor.h b/clang/include/clang/Lex/Preprocessor.h
index c0850a8fa9f7f..986ea0ba8c3c4 100644
--- a/clang/include/clang/Lex/Preprocessor.h
+++ b/clang/include/clang/Lex/Preprocessor.h
@@ -19,7 +19,7 @@
 #include "clang/Basic/IdentifierTable.h"
 #include "clang/Basic/LLVM.h"
 #include "clang/Basic/LangOptions.h"
-#include "clang/Basic/Module.h"
+#include "clang/Basic/Module/Module.h"
 #include "clang/Basic/SourceLocation.h"
 #include "clang/Basic/SourceManager.h"
 #include "clang/Basic/TokenKinds.h"
diff --git a/clang/include/clang/Sema/Sema.h b/clang/include/clang/Sema/Sema.h
index 5247379181808..dd01197c8fafa 100644
--- a/clang/include/clang/Sema/Sema.h
+++ b/clang/include/clang/Sema/Sema.h
@@ -40,7 +40,7 @@
 #include "clang/Basic/DarwinSDKInfo.h"
 #include "clang/Basic/ExpressionTraits.h"
 #include "clang/Basic/IdentifierTable.h"
-#include "clang/Basic/Module.h"
+#include "clang/Basic/Module/Module.h"
 #include "clang/Basic/OpenCLOptions.h"
 #include "clang/Basic/PragmaKinds.h"
 #include "clang/Basic/Specifiers.h"
diff --git a/clang/include/clang/Serialization/ASTWriter.h b/clang/include/clang/Serialization/ASTWriter.h
index 88192e439a3f0..08b4340d8a47b 100644
--- a/clang/include/clang/Serialization/ASTWriter.h
+++ b/clang/include/clang/Serialization/ASTWriter.h
@@ -18,7 +18,7 @@
 #include "clang/AST/Decl.h"
 #include "clang/AST/Type.h"
 #include "clang/Basic/LLVM.h"
-#include "clang/Basic/Module.h"
+#include "clang/Basic/Module/Module.h"
 #include "clang/Basic/SourceLocation.h"
 #include "clang/Sema/Sema.h"
 #include "clang/Sema/SemaConsumer.h"
diff --git a/clang/include/clang/Serialization/ModuleFile.h b/clang/include/clang/Serialization/ModuleFile.h
index 7d8cbe3d40f56..e395397158a3b 100644
--- a/clang/include/clang/Serialization/ModuleFile.h
+++ b/clang/include/clang/Serialization/ModuleFile.h
@@ -15,7 +15,7 @@
 #define LLVM_CLANG_SERIALIZATION_MODULEFILE_H
 
 #include "clang/Basic/FileManager.h"
-#include "clang/Basic/Module.h"
+#include "clang/Basic/Module/Module.h"
 #include "clang/Basic/SourceLocation.h"
 #include "clang/Serialization/ASTBitCodes.h"
 #include "clang/Serialization/ContinuousRangeMap.h"
diff --git a/clang/include/clang/Serialization/ModuleManager.h b/clang/include/clang/Serialization/ModuleManager.h
index 3bd379acf7eda..eed803aa40d07 100644
--- a/clang/include/clang/Serialization/ModuleManager.h
+++ b/clang/include/clang/Serialization/ModuleManager.h
@@ -15,7 +15,7 @@
 #define LLVM_CLANG_SERIALIZATION_MODULEMANAGER_H
 
 #include "clang/Basic/LLVM.h"
-#include "clang/Basic/Module.h"
+#include "clang/Basic/Module/Module.h"
 #include "clang/Basic/SourceLocation.h"
 #include "clang/Serialization/ModuleFile.h"
 #include "llvm/ADT/DenseMap.h"
diff --git a/clang/include/clang/Serialization/PCHContainerOperations.h b/clang/include/clang/Serialization/PCHContainerOperations.h
index c9a7e334ce6eb..26d45fea66e2e 100644
--- a/clang/include/clang/Serialization/PCHContainerOperations.h
+++ b/clang/include/clang/Serialization/PCHContainerOperations.h
@@ -9,7 +9,7 @@
 #ifndef LLVM_CLANG_SERIALIZATION_PCHCONTAINEROPERATIONS_H
 #define LLVM_CLANG_SERIALIZATION_PCHCONTAINEROPERATIONS_H
 
-#include "clang/Basic/Module.h"
+#include "clang/Basic/Module/Module.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/StringMap.h"
 #include "llvm/Support/MemoryBufferRef.h"
diff --git a/clang/lib/AST/ASTContext.cpp b/clang/lib/AST/ASTContext.cpp
index a2398fef623ea..98675bd206946 100644
--- a/clang/lib/AST/ASTContext.cpp
+++ b/clang/lib/AST/ASTContext.cpp
@@ -56,7 +56,7 @@
 #include "clang/Basic/LLVM.h"
 #include "clang/Basic/LangOptions.h"
 #include "clang/Basic/Linkage.h"
-#include "clang/Basic/Module.h"
+#include "clang/Basic/Module/Module.h"
 #include "clang/Basic/NoSanitizeList.h"
 #include "clang/Basic/ObjCRuntime.h"
 #include "clang/Basic/ProfileList.h"
diff --git a/clang/lib/AST/ASTDumper.cpp b/clang/lib/AST/ASTDumper.cpp
index 6efc5bb92e28d..203c48a9dc3d1 100644
--- a/clang/lib/AST/ASTDumper.cpp
+++ b/clang/lib/AST/ASTDumper.cpp
@@ -17,7 +17,7 @@
 #include "clang/AST/DeclLookups.h"
 #include "clang/AST/JSONNodeDumper.h"
 #include "clang/Basic/Builtins.h"
-#include "clang/Basic/Module.h"
+#include "clang/Basic/Module/Module.h"
 #include "clang/Basic/SourceManager.h"
 #include "llvm/Support/raw_ostream.h"
 
diff --git a/clang/lib/AST/Decl.cpp b/clang/lib/AST/Decl.cpp
index 41fbfe281ef65..fe01d2606e4dc 100644
--- a/clang/lib/AST/Decl.cpp
+++ b/clang/lib/AST/Decl.cpp
@@ -42,7 +42,7 @@
 #include "clang/Basic/LLVM.h"
 #include "clang/Basic/LangOptions.h"
 #include "clang/Basic/Linkage.h"
-#include "clang/Basic/Module.h"
+#include "clang/Basic/Module/Module.h"
 #include "clang/Basic/NoSanitizeList.h"
 #include "clang/Basic/PartialDiagnostic.h"
 #include "clang/Basic/Sanitizers.h"
diff --git a/clang/lib/AST/DeclBase.cpp b/clang/lib/AST/DeclBase.cpp
index 65d5eeb6354eb..a70f59f414212 100644
--- a/clang/lib/AST/DeclBase.cpp
+++ b/clang/lib/AST/DeclBase.cpp
@@ -29,7 +29,7 @@
 #include "clang/AST/Type.h"
 #include "clang/Basic/IdentifierTable.h"
 #include "clang/Basic/LLVM.h"
-#include "clang/Basic/Module.h"
+#include "clang/Basic/Module/Module.h"
 #include "clang/Basic/ObjCRuntime.h"
 #include "clang/Basic/PartialDiagnostic.h"
 #include "clang/Basic/SourceLocation.h"
diff --git a/clang/lib/AST/DeclPrinter.cpp b/clang/lib/AST/DeclPrinter.cpp
index 0cf4e64f83b8d..c07936ea2d3e9 100644
--- a/clang/lib/AST/DeclPrinter.cpp
+++ b/clang/lib/AST/DeclPrinter.cpp
@@ -20,7 +20,7 @@
 #include "clang/AST/Expr.h"
 #include "clang/AST/ExprCXX.h"
 #include "clang/AST/PrettyPrinter.h"
-#include "clang/Basic/Module.h"
+#include "clang/Basic/Module/Module.h"
 #include "clang/Basic/SourceManager.h"
 #include "llvm/Support/raw_ostream.h"
 using namespace clang;
diff --git a/clang/lib/AST/ExternalASTSource.cpp b/clang/lib/AST/ExternalASTSource.cpp
index a5b6f80bde694..fb16f41ced520 100644
--- a/clang/lib/AST/ExternalASTSource.cpp
+++ b/clang/lib/AST/ExternalASTSource.cpp
@@ -15,7 +15,7 @@
 #include "clang/AST/ExternalASTSource.h"
 #include "clang/AST/ASTContext.h"
 #include "clang/AST/DeclarationName.h"
-#include "clang/Basic/ASTSourceDescriptor.h"
+#include "clang/Basic/Module/ASTSourceDescriptor.h"
 #include "clang/Basic/FileManager.h"
 #include "clang/Basic/IdentifierTable.h"
 #include "clang/Basic/LLVM.h"
diff --git a/clang/lib/AST/ItaniumMangle.cpp b/clang/lib/AST/ItaniumMangle.cpp
index ed9e6eeb36c75..4d010b70cd8b4 100644
--- a/clang/lib/AST/ItaniumMangle.cpp
+++ b/clang/lib/AST/ItaniumMangle.cpp
@@ -29,7 +29,7 @@
 #include "clang/AST/TypeLoc.h"
 #include "clang/Basic/ABI.h"
 #include "clang/Basic/DiagnosticAST.h"
-#include "clang/Basic/Module.h"
+#include "clang/Basic/Module/Module.h"
 #include "clang/Basic/SourceManager.h"
 #include "clang/Basic/TargetInfo.h"
 #include "clang/Basic/Thunk.h"
diff --git a/clang/lib/AST/ODRDiagsEmitter.cpp b/clang/lib/AST/ODRDiagsEmitter.cpp
index 37f0f68c92355..d262dd87cfff2 100644
--- a/clang/lib/AST/ODRDiagsEmitter.cpp
+++ b/clang/lib/AST/ODRDiagsEmitter.cpp
@@ -11,7 +11,7 @@
 #include "clang/AST/DeclTemplate.h"
 #include "clang/AST/ODRHash.h"
 #include "clang/Basic/DiagnosticAST.h"
-#include "clang/Basic/Module.h"
+#include "clang/Basic/Module/Module.h"
 
 using namespace clang;
 
diff --git a/clang/lib/AST/TextNodeDumper.cpp b/clang/lib/AST/TextNodeDumper.cpp
index 4a1e94ffe283b..5299ebbfbfb42 100644
--- a/clang/lib/AST/TextNodeDumper.cpp
+++ b/clang/lib/AST/TextNodeDumper.cpp
@@ -19,7 +19,7 @@
 #include "clang/AST/NestedNameSpecifier.h"
 #include "clang/AST/Type.h"
 #include "clang/AST/TypeLocVisitor.h"
-#include "clang/Basic/Module.h"
+#include "clang/Basic/Module/Module.h"
 #include "clang/Basic/SourceManager.h"
 #include "clang/Basic/Specifiers.h"
 #include "clang/Basic/TypeTraits.h"
diff --git a/clang/lib/Basic/CMakeLists.txt b/clang/lib/Basic/CMakeLists.txt
index f30680552e0f5..fae3ef13b8796 100644
--- a/clang/lib/Basic/CMakeLists.txt
+++ b/clang/lib/Basic/CMakeLists.txt
@@ -55,12 +55,11 @@ if(CLANG_VENDOR)
 endif()
 
 add_clang_library(clangBasic
-  ASTSourceDescriptor.cpp
-  Attributes.cpp
-  Builtins.cpp
-  CLWarnings.cpp
-  CharInfo.cpp
-  CodeGenOptions.cpp
+Attributes.cpp
+Builtins.cpp
+CLWarnings.cpp
+CharInfo.cpp
+CodeGenOptions.cpp
   Cuda.cpp
   DarwinSDKInfo.cpp
   Diagnostic.cpp
@@ -74,7 +73,8 @@ add_clang_library(clangBasic
   LangOptions.cpp
   LangStandards.cpp
   MakeSupport.cpp
-  Module.cpp
+  Module/ASTSourceDescriptor.cpp
+  Module/Module.cpp
   ObjCRuntime.cpp
   OpenCLOptions.cpp
   OpenMPKinds.cpp
diff --git a/clang/lib/Basic/Module.cpp b/clang/lib/Basic/Module.cpp
index 90b7b0d24bb6a..581509b888a5b 100644
--- a/clang/lib/Basic/Module.cpp
+++ b/clang/lib/Basic/Module.cpp
@@ -11,7 +11,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "clang/Basic/Module.h"
+#include "clang/Basic/Module/Module.h"
 #include "clang/Basic/CharInfo.h"
 #include "clang/Basic/FileManager.h"
 #include "clang/Basic/LangOptions.h"
diff --git a/clang/lib/Basic/ASTSourceDescriptor.cpp b/clang/lib/Basic/Module/ASTSourceDescriptor.cpp
similarity index 94%
rename from clang/lib/Basic/ASTSourceDescriptor.cpp
rename to clang/lib/Basic/Module/ASTSourceDescriptor.cpp
index 8072c08a51d3a..b27cd45b4cb74 100644
--- a/clang/lib/Basic/ASTSourceDescriptor.cpp
+++ b/clang/lib/Basic/Module/ASTSourceDescriptor.cpp
@@ -11,7 +11,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "clang/Basic/ASTSourceDescriptor.h"
+#include "clang/Basic/Module/ASTSourceDescriptor.h"
 
 namespace clang {
 
diff --git a/clang/lib/Basic/Module/Module.cpp b/clang/lib/Basic/Module/Module.cpp
new file mode 100644
index 0000000000000..581509b888a5b
--- /dev/null
+++ b/clang/lib/Basic/Module/Module.cpp
@@ -0,0 +1,726 @@
+//===- Module.cpp - Describe a module -------------------------------------===//
+//
+// 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 defines the Module class, which describes a module in the source
+// code.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Basic/Module/Module.h"
+#include "clang/Basic/CharInfo.h"
+#include "clang/Basic/FileManager.h"
+#include "clang/Basic/LangOptions.h"
+#include "clang/Basic/SourceLocation.h"
+#include "clang/Basic/TargetInfo.h"
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/StringMap.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/ADT/StringSwitch.h"
+#include "llvm/Support/Compiler.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/raw_ostream.h"
+#include <algorithm>
+#include <cassert>
+#include <functional>
+#include <string>
+#include <utility>
+#include <vector>
+
+using namespace clang;
+
+Module::Module(StringRef Name, SourceLocation DefinitionLoc, Module *Parent,
+               bool IsFramework, bool IsExplicit, unsigned VisibilityID)
+    : Name(Name), DefinitionLoc(DefinitionLoc), Parent(Parent),
+      VisibilityID(VisibilityID), IsUnimportable(false),
+      HasIncompatibleModuleFile(false), IsAvailable(true),
+      IsFromModuleFile(false), IsFramework(IsFramework), IsExplicit(IsExplicit),
+      IsSystem(false), IsExternC(false), IsInferred(false),
+      InferSubmodules(false), InferExplicitSubmodules(false),
+      InferExportWildcard(false), ConfigMacrosExhaustive(false),
+      NoUndeclaredIncludes(false), ModuleMapIsPrivate(false),
+      NamedModuleHasInit(true), NameVisibility(Hidden) {
+  if (Parent) {
+    IsAvailable = Parent->isAvailable();
+    IsUnimportable = Parent->isUnimportable();
+    IsSystem = Parent->IsSystem;
+    IsExternC = Parent->IsExternC;
+    NoUndeclaredIncludes = Parent->NoUndeclaredIncludes;
+    ModuleMapIsPrivate = Parent->ModuleMapIsPrivate;
+
+    Parent->SubModuleIndex[Name] = Parent->SubModules.size();
+    Parent->SubModules.push_back(this);
+  }
+}
+
+Module::~Module() {
+  for (auto *Submodule : SubModules) {
+    delete Submodule;
+  }
+}
+
+static bool isPlatformEnvironment(const TargetInfo &Target, StringRef Feature) {
+  StringRef Platform = Target.getPlatformName();
+  StringRef Env = Target.getTriple().getEnvironmentName();
+
+  // Attempt to match platform and environment.
+  if (Platform == Feature || Target.getTriple().getOSName() == Feature ||
+      Env == Feature)
+    return true;
+
+  auto CmpPlatformEnv = [](StringRef LHS, StringRef RHS) {
+    auto Pos = LHS.find('-');
+    if (Pos == StringRef::npos)
+      return false;
+    SmallString<128> NewLHS = LHS.slice(0, Pos);
+    NewLHS += LHS.slice(Pos+1, LHS.size());
+    return NewLHS == RHS;
+  };
+
+  SmallString<128> PlatformEnv = Target.getTriple().getOSAndEnvironmentName();
+  // Darwin has different but equivalent variants for simulators, example:
+  //   1. x86_64-apple-ios-simulator
+  //   2. x86_64-apple-iossimulator
+  // where both are valid examples of the same platform+environment but in the
+  // variant (2) the simulator is hardcoded as part of the platform name. Both
+  // forms above should match for "iossimulator" requirement.
+  if (Target.getTriple().isOSDarwin() && PlatformEnv.ends_with("simulator"))
+    return PlatformEnv == Feature || CmpPlatformEnv(PlatformEnv, Feature);
+
+  return PlatformEnv == Feature;
+}
+
+/// Determine whether a translation unit built using the current
+/// language options has the given feature.
+static bool hasFeature(StringRef Feature, const LangOptions &LangOpts,
+                       const TargetInfo &Target) {
+  bool HasFeature = llvm::StringSwitch<bool>(Feature)
+                        .Case("altivec", LangOpts.AltiVec)
+                        .Case("blocks", LangOpts.Blocks)
+                        .Case("coroutines", LangOpts.Coroutines)
+                        .Case("cplusplus", LangOpts.CPlusPlus)
+                        .Case("cplusplus11", LangOpts.CPlusPlus11)
+                        .Case("cplusplus14", LangOpts.CPlusPlus14)
+                        .Case("cplusplus17", LangOpts.CPlusPlus17)
+                        .Case("cplusplus20", LangOpts.CPlusPlus20)
+                        .Case("cplusplus23", LangOpts.CPlusPlus23)
+                        .Case("cplusplus26", LangOpts.CPlusPlus26)
+                        .Case("c99", LangOpts.C99)
+                        .Case("c11", LangOpts.C11)
+                        .Case("c17", LangOpts.C17)
+                        .Case("c23", LangOpts.C23)
+                        .Case("freestanding", LangOpts.Freestanding)
+                        .Case("gnuinlineasm", LangOpts.GNUAsm)
+                        .Case("objc", LangOpts.ObjC)
+                        .Case("objc_arc", LangOpts.ObjCAutoRefCount)
+                        .Case("opencl", LangOpts.OpenCL)
+                        .Case("tls", Target.isTLSSupported())
+                        .Case("zvector", LangOpts.ZVector)
+                        .Default(Target.hasFeature(Feature) ||
+                                 isPlatformEnvironment(Target, Feature));
+  if (!HasFeature)
+    HasFeature = llvm::is_contained(LangOpts.ModuleFeatures, Feature);
+  return HasFeature;
+}
+
+bool Module::isUnimportable(const LangOptions &LangOpts,
+                            const TargetInfo &Target, Requirement &Req,
+                            Module *&ShadowingModule) const {
+  if (!IsUnimportable)
+    return false;
+
+  for (const Module *Current = this; Current; Current = Current->Parent) {
+    if (Current->ShadowingModule) {
+      ShadowingModule = Current->ShadowingModule;
+      return true;
+    }
+    for (unsigned I = 0, N = Current->Requirements.size(); I != N; ++I) {
+      if (hasFeature(Current->Requirements[I].FeatureName, LangOpts, Target) !=
+          Current->Requirements[I].RequiredState) {
+        Req = Current->Requirements[I];
+        return true;
+      }
+    }
+  }
+
+  llvm_unreachable("could not find a reason why module is unimportable");
+}
+
+// The -fmodule-name option tells the compiler to textually include headers in
+// the specified module, meaning Clang won't build the specified module. This
+// is useful in a number of situations, for instance, when building a library
+// that vends a module map, one might want to avoid hitting intermediate build
+// products containing the module map or avoid finding the system installed
+// modulemap for that library.
+bool Module::isForBuilding(const LangOptions &LangOpts) const {
+  StringRef TopLevelName = getTopLevelModuleName();
+  StringRef CurrentModule = LangOpts.CurrentModule;
+
+  // When building the implementation of framework Foo, we want to make sure
+  // that Foo *and* Foo_Private are textually included and no modules are built
+  // for either.
+  if (!LangOpts.isCompilingModule() && getTopLevelModule()->IsFramework &&
+      CurrentModule == LangOpts.ModuleName &&
+      !CurrentModule.ends_with("_Private") &&
+      TopLevelName.ends_with("_Private"))
+    TopLevelName = TopLevelName.drop_back(8);
+
+  return TopLevelName == CurrentModule;
+}
+
+bool Module::isAvailable(const LangOptions &LangOpts, const TargetInfo &Target,
+                         Requirement &Req,
+                         UnresolvedHeaderDirective &MissingHeader,
+                         Module *&ShadowingModule) const {
+  if (IsAvailable)
+    return true;
+
+  if (isUnimportable(LangOpts, Target, Req, ShadowingModule))
+    return false;
+
+  // FIXME: All missing headers are listed on the top-level module. Should we
+  // just look there?
+  for (const Module *Current = this; Current; Current = Current->Parent) {
+    if (!Current->MissingHeaders.empty()) {
+      MissingHeader = Current->MissingHeaders.front();
+      return false;
+    }
+  }
+
+  llvm_unreachable("could not find a reason why module is unavailable");
+}
+
+bool Module::isSubModuleOf(const Module *Other) const {
+  for (auto *Parent = this; Parent; Parent = Parent->Parent) {
+    if (Parent == Other)
+      return true;
+  }
+  return false;
+}
+
+const Module *Module::getTopLevelModule() const {
+  const Module *Result = this;
+  while (Result->Parent)
+    Result = Result->Parent;
+
+  return Result;
+}
+
+static StringRef getModuleNameFromComponent(
+    const std::pair<std::string, SourceLocation> &IdComponent) {
+  return IdComponent.first;
+}
+
+static StringRef getModuleNameFromComponent(StringRef R) { return R; }
+
+template<typename InputIter>
+static void printModuleId(raw_ostream &OS, InputIter Begin, InputIter End,
+                          bool AllowStringLiterals = true) {
+  for (InputIter It = Begin; It != End; ++It) {
+    if (It != Begin)
+      OS << ".";
+
+    StringRef Name = getModuleNameFromComponent(*It);
+    if (!AllowStringLiterals || isValidAsciiIdentifier(Name))
+      OS << Name;
+    else {
+      OS << '"';
+      OS.write_escaped(Name);
+      OS << '"';
+    }
+  }
+}
+
+template<typename Container>
+static void printModuleId(raw_ostream &OS, const Container &C) {
+  return printModuleId(OS, C.begin(), C.end());
+}
+
+std::string Module::getFullModuleName(bool AllowStringLiterals) const {
+  SmallVector<StringRef, 2> Names;
+
+  // Build up the set of module names (from innermost to outermost).
+  for (const Module *M = this; M; M = M->Parent)
+    Names.push_back(M->Name);
+
+  std::string Result;
+
+  llvm::raw_string_ostream Out(Result);
+  printModuleId(Out, Names.rbegin(), Names.rend(), AllowStringLiterals);
+  Out.flush();
+
+  return Result;
+}
+
+bool Module::fullModuleNameIs(ArrayRef<StringRef> nameParts) const {
+  for (const Module *M = this; M; M = M->Parent) {
+    if (nameParts.empty() || M->Name != nameParts.back())
+      return false;
+    nameParts = nameParts.drop_back();
+  }
+  return nameParts.empty();
+}
+
+OptionalDirectoryEntryRef Module::getEffectiveUmbrellaDir() const {
+  if (const auto *Hdr = std::get_if<FileEntryRef>(&Umbrella))
+    return Hdr->getDir();
+  if (const auto *Dir = std::get_if<DirectoryEntryRef>(&Umbrella))
+    return *Dir;
+  return std::nullopt;
+}
+
+void Module::addTopHeader(FileEntryRef File) {
+  assert(File);
+  TopHeaders.insert(File);
+}
+
+ArrayRef<FileEntryRef> Module::getTopHeaders(FileManager &FileMgr) {
+  if (!TopHeaderNames.empty()) {
+    for (StringRef TopHeaderName : TopHeaderNames)
+      if (auto FE = FileMgr.getOptionalFileRef(TopHeaderName))
+        TopHeaders.insert(*FE);
+    TopHeaderNames.clear();
+  }
+
+  return llvm::ArrayRef(TopHeaders.begin(), TopHeaders.end());
+}
+
+bool Module::directlyUses(const Module *Requested) {
+  auto *Top = getTopLevelModule();
+
+  // A top-level module implicitly uses itself.
+  if (Requested->isSubModuleOf(Top))
+    return true;
+
+  for (auto *Use : Top->DirectUses)
+    if (Requested->isSubModuleOf(Use))
+      return true;
+
+  // Anyone is allowed to use our builtin stddef.h and its accompanying modules.
+  if (Requested->fullModuleNameIs({"_Builtin_stddef", "max_align_t"}) ||
+      Requested->fullModuleNameIs({"_Builtin_stddef_wint_t"}))
+    return true;
+  // Darwin is allowed is to use our builtin 'ptrauth.h' and its accompanying
+  // module.
+  if (!Requested->Parent && Requested->Name == "ptrauth")
+    return true;
+
+  if (NoUndeclaredIncludes)
+    UndeclaredUses.insert(Requested);
+
+  return false;
+}
+
+void Module::addRequirement(StringRef Feature, bool RequiredState,
+                            const LangOptions &LangOpts,
+                            const TargetInfo &Target) {
+  Requirements.push_back(Requirement{std::string(Feature), RequiredState});
+
+  // If this feature is currently available, we're done.
+  if (hasFeature(Feature, LangOpts, Target) == RequiredState)
+    return;
+
+  markUnavailable(/*Unimportable*/true);
+}
+
+void Module::markUnavailable(bool Unimportable) {
+  auto needUpdate = [Unimportable](Module *M) {
+    return M->IsAvailable || (!M->IsUnimportable && Unimportable);
+  };
+
+  if (!needUpdate(this))
+    return;
+
+  SmallVector<Module *, 2> Stack;
+  Stack.push_back(this);
+  while (!Stack.empty()) {
+    Module *Current = Stack.back();
+    Stack.pop_back();
+
+    if (!needUpdate(Current))
+      continue;
+
+    Current->IsAvailable = false;
+    Current->IsUnimportable |= Unimportable;
+    for (auto *Submodule : Current->submodules()) {
+      if (needUpdate(Submodule))
+        Stack.push_back(Submodule);
+    }
+  }
+}
+
+Module *Module::findSubmodule(StringRef Name) const {
+  llvm::StringMap<unsigned>::const_iterator Pos = SubModuleIndex.find(Name);
+  if (Pos == SubModuleIndex.end())
+    return nullptr;
+
+  return SubModules[Pos->getValue()];
+}
+
+Module *Module::findOrInferSubmodule(StringRef Name) {
+  llvm::StringMap<unsigned>::const_iterator Pos = SubModuleIndex.find(Name);
+  if (Pos != SubModuleIndex.end())
+    return SubModules[Pos->getValue()];
+  if (!InferSubmodules)
+    return nullptr;
+  Module *Result = new Module(Name, SourceLocation(), this, false, InferExplicitSubmodules, 0);
+  Result->InferExplicitSubmodules = InferExplicitSubmodules;
+  Result->InferSubmodules = InferSubmodules;
+  Result->InferExportWildcard = InferExportWildcard;
+  if (Result->InferExportWildcard)
+    Result->Exports.push_back(Module::ExportDecl(nullptr, true));
+  return Result;
+}
+
+Module *Module::getGlobalModuleFragment() const {
+  assert(isNamedModuleUnit() && "We should only query the global module "
+                                "fragment from the C++20 Named modules");
+
+  for (auto *SubModule : SubModules)
+    if (SubModule->isExplicitGlobalModule())
+      return SubModule;
+
+  return nullptr;
+}
+
+Module *Module::getPrivateModuleFragment() const {
+  assert(isNamedModuleUnit() && "We should only query the private module "
+                                "fragment from the C++20 Named modules");
+
+  for (auto *SubModule : SubModules)
+    if (SubModule->isPrivateModule())
+      return SubModule;
+
+  return nullptr;
+}
+
+void Module::getExportedModules(SmallVectorImpl<Module *> &Exported) const {
+  // All non-explicit submodules are exported.
+  for (std::vector<Module *>::const_iterator I = SubModules.begin(),
+                                             E = SubModules.end();
+       I != E; ++I) {
+    Module *Mod = *I;
+    if (!Mod->IsExplicit)
+      Exported.push_back(Mod);
+  }
+
+  // Find re-exported modules by filtering the list of imported modules.
+  bool AnyWildcard = false;
+  bool UnrestrictedWildcard = false;
+  SmallVector<Module *, 4> WildcardRestrictions;
+  for (unsigned I = 0, N = Exports.size(); I != N; ++I) {
+    Module *Mod = Exports[I].getPointer();
+    if (!Exports[I].getInt()) {
+      // Export a named module directly; no wildcards involved.
+      Exported.push_back(Mod);
+
+      continue;
+    }
+
+    // Wildcard export: export all of the imported modules that match
+    // the given pattern.
+    AnyWildcard = true;
+    if (UnrestrictedWildcard)
+      continue;
+
+    if (Module *Restriction = Exports[I].getPointer())
+      WildcardRestrictions.push_back(Restriction);
+    else {
+      WildcardRestrictions.clear();
+      UnrestrictedWildcard = true;
+    }
+  }
+
+  // If there were any wildcards, push any imported modules that were
+  // re-exported by the wildcard restriction.
+  if (!AnyWildcard)
+    return;
+
+  for (unsigned I = 0, N = Imports.size(); I != N; ++I) {
+    Module *Mod = Imports[I];
+    bool Acceptable = UnrestrictedWildcard;
+    if (!Acceptable) {
+      // Check whether this module meets one of the restrictions.
+      for (unsigned R = 0, NR = WildcardRestrictions.size(); R != NR; ++R) {
+        Module *Restriction = WildcardRestrictions[R];
+        if (Mod == Restriction || Mod->isSubModuleOf(Restriction)) {
+          Acceptable = true;
+          break;
+        }
+      }
+    }
+
+    if (!Acceptable)
+      continue;
+
+    Exported.push_back(Mod);
+  }
+}
+
+void Module::buildVisibleModulesCache() const {
+  assert(VisibleModulesCache.empty() && "cache does not need building");
+
+  // This module is visible to itself.
+  VisibleModulesCache.insert(this);
+
+  // Every imported module is visible.
+  SmallVector<Module *, 16> Stack(Imports.begin(), Imports.end());
+  while (!Stack.empty()) {
+    Module *CurrModule = Stack.pop_back_val();
+
+    // Every module transitively exported by an imported module is visible.
+    if (VisibleModulesCache.insert(CurrModule).second)
+      CurrModule->getExportedModules(Stack);
+  }
+}
+
+void Module::print(raw_ostream &OS, unsigned Indent, bool Dump) const {
+  OS.indent(Indent);
+  if (IsFramework)
+    OS << "framework ";
+  if (IsExplicit)
+    OS << "explicit ";
+  OS << "module ";
+  printModuleId(OS, &Name, &Name + 1);
+
+  if (IsSystem || IsExternC) {
+    OS.indent(Indent + 2);
+    if (IsSystem)
+      OS << " [system]";
+    if (IsExternC)
+      OS << " [extern_c]";
+  }
+
+  OS << " {\n";
+
+  if (!Requirements.empty()) {
+    OS.indent(Indent + 2);
+    OS << "requires ";
+    for (unsigned I = 0, N = Requirements.size(); I != N; ++I) {
+      if (I)
+        OS << ", ";
+      if (!Requirements[I].RequiredState)
+        OS << "!";
+      OS << Requirements[I].FeatureName;
+    }
+    OS << "\n";
+  }
+
+  if (std::optional<Header> H = getUmbrellaHeaderAsWritten()) {
+    OS.indent(Indent + 2);
+    OS << "umbrella header \"";
+    OS.write_escaped(H->NameAsWritten);
+    OS << "\"\n";
+  } else if (std::optional<DirectoryName> D = getUmbrellaDirAsWritten()) {
+    OS.indent(Indent + 2);
+    OS << "umbrella \"";
+    OS.write_escaped(D->NameAsWritten);
+    OS << "\"\n";
+  }
+
+  if (!ConfigMacros.empty() || ConfigMacrosExhaustive) {
+    OS.indent(Indent + 2);
+    OS << "config_macros ";
+    if (ConfigMacrosExhaustive)
+      OS << "[exhaustive]";
+    for (unsigned I = 0, N = ConfigMacros.size(); I != N; ++I) {
+      if (I)
+        OS << ", ";
+      OS << ConfigMacros[I];
+    }
+    OS << "\n";
+  }
+
+  struct {
+    StringRef Prefix;
+    HeaderKind Kind;
+  } Kinds[] = {{"", HK_Normal},
+               {"textual ", HK_Textual},
+               {"private ", HK_Private},
+               {"private textual ", HK_PrivateTextual},
+               {"exclude ", HK_Excluded}};
+
+  for (auto &K : Kinds) {
+    assert(&K == &Kinds[K.Kind] && "kinds in wrong order");
+    for (auto &H : Headers[K.Kind]) {
+      OS.indent(Indent + 2);
+      OS << K.Prefix << "header \"";
+      OS.write_escaped(H.NameAsWritten);
+      OS << "\" { size " << H.Entry.getSize()
+         << " mtime " << H.Entry.getModificationTime() << " }\n";
+    }
+  }
+  for (auto *Unresolved : {&UnresolvedHeaders, &MissingHeaders}) {
+    for (auto &U : *Unresolved) {
+      OS.indent(Indent + 2);
+      OS << Kinds[U.Kind].Prefix << "header \"";
+      OS.write_escaped(U.FileName);
+      OS << "\"";
+      if (U.Size || U.ModTime) {
+        OS << " {";
+        if (U.Size)
+          OS << " size " << *U.Size;
+        if (U.ModTime)
+          OS << " mtime " << *U.ModTime;
+        OS << " }";
+      }
+      OS << "\n";
+    }
+  }
+
+  if (!ExportAsModule.empty()) {
+    OS.indent(Indent + 2);
+    OS << "export_as" << ExportAsModule << "\n";
+  }
+
+  for (auto *Submodule : submodules())
+    // Print inferred subframework modules so that we don't need to re-infer
+    // them (requires expensive directory iteration + stat calls) when we build
+    // the module. Regular inferred submodules are OK, as we need to look at all
+    // those header files anyway.
+    if (!Submodule->IsInferred || Submodule->IsFramework)
+      Submodule->print(OS, Indent + 2, Dump);
+
+  for (unsigned I = 0, N = Exports.size(); I != N; ++I) {
+    OS.indent(Indent + 2);
+    OS << "export ";
+    if (Module *Restriction = Exports[I].getPointer()) {
+      OS << Restriction->getFullModuleName(true);
+      if (Exports[I].getInt())
+        OS << ".*";
+    } else {
+      OS << "*";
+    }
+    OS << "\n";
+  }
+
+  for (unsigned I = 0, N = UnresolvedExports.size(); I != N; ++I) {
+    OS.indent(Indent + 2);
+    OS << "export ";
+    printModuleId(OS, UnresolvedExports[I].Id);
+    if (UnresolvedExports[I].Wildcard)
+      OS << (UnresolvedExports[I].Id.empty() ? "*" : ".*");
+    OS << "\n";
+  }
+
+  if (Dump) {
+    for (Module *M : Imports) {
+      OS.indent(Indent + 2);
+      llvm::errs() << "import " << M->getFullModuleName() << "\n";
+    }
+  }
+
+  for (unsigned I = 0, N = DirectUses.size(); I != N; ++I) {
+    OS.indent(Indent + 2);
+    OS << "use ";
+    OS << DirectUses[I]->getFullModuleName(true);
+    OS << "\n";
+  }
+
+  for (unsigned I = 0, N = UnresolvedDirectUses.size(); I != N; ++I) {
+    OS.indent(Indent + 2);
+    OS << "use ";
+    printModuleId(OS, UnresolvedDirectUses[I]);
+    OS << "\n";
+  }
+
+  for (unsigned I = 0, N = LinkLibraries.size(); I != N; ++I) {
+    OS.indent(Indent + 2);
+    OS << "link ";
+    if (LinkLibraries[I].IsFramework)
+      OS << "framework ";
+    OS << "\"";
+    OS.write_escaped(LinkLibraries[I].Library);
+    OS << "\"";
+  }
+
+  for (unsigned I = 0, N = UnresolvedConflicts.size(); I != N; ++I) {
+    OS.indent(Indent + 2);
+    OS << "conflict ";
+    printModuleId(OS, UnresolvedConflicts[I].Id);
+    OS << ", \"";
+    OS.write_escaped(UnresolvedConflicts[I].Message);
+    OS << "\"\n";
+  }
+
+  for (unsigned I = 0, N = Conflicts.size(); I != N; ++I) {
+    OS.indent(Indent + 2);
+    OS << "conflict ";
+    OS << Conflicts[I].Other->getFullModuleName(true);
+    OS << ", \"";
+    OS.write_escaped(Conflicts[I].Message);
+    OS << "\"\n";
+  }
+
+  if (InferSubmodules) {
+    OS.indent(Indent + 2);
+    if (InferExplicitSubmodules)
+      OS << "explicit ";
+    OS << "module * {\n";
+    if (InferExportWildcard) {
+      OS.indent(Indent + 4);
+      OS << "export *\n";
+    }
+    OS.indent(Indent + 2);
+    OS << "}\n";
+  }
+
+  OS.indent(Indent);
+  OS << "}\n";
+}
+
+LLVM_DUMP_METHOD void Module::dump() const {
+  print(llvm::errs(), 0, true);
+}
+
+void VisibleModuleSet::setVisible(Module *M, SourceLocation Loc,
+                                  VisibleCallback Vis, ConflictCallback Cb) {
+  // We can't import a global module fragment so the location can be invalid.
+  assert((M->isGlobalModule() || Loc.isValid()) &&
+         "setVisible expects a valid import location");
+  if (isVisible(M))
+    return;
+
+  ++Generation;
+
+  struct Visiting {
+    Module *M;
+    Visiting *ExportedBy;
+  };
+
+  std::function<void(Visiting)> VisitModule = [&](Visiting V) {
+    // Nothing to do for a module that's already visible.
+    unsigned ID = V.M->getVisibilityID();
+    if (ImportLocs.size() <= ID)
+      ImportLocs.resize(ID + 1);
+    else if (ImportLocs[ID].isValid())
+      return;
+
+    ImportLocs[ID] = Loc;
+    Vis(V.M);
+
+    // Make any exported modules visible.
+    SmallVector<Module *, 16> Exports;
+    V.M->getExportedModules(Exports);
+    for (Module *E : Exports) {
+      // Don't import non-importable modules.
+      if (!E->isUnimportable())
+        VisitModule({E, &V});
+    }
+
+    for (auto &C : V.M->Conflicts) {
+      if (isVisible(C.Other)) {
+        llvm::SmallVector<Module*, 8> Path;
+        for (Visiting *I = &V; I; I = I->ExportedBy)
+          Path.push_back(I->M);
+        Cb(Path, C.Other, C.Message);
+      }
+    }
+  };
+  VisitModule({M, nullptr});
+}
diff --git a/clang/lib/CodeGen/CGDebugInfo.h b/clang/lib/CodeGen/CGDebugInfo.h
index 8fe738be21568..530c5eeedb74f 100644
--- a/clang/lib/CodeGen/CGDebugInfo.h
+++ b/clang/lib/CodeGen/CGDebugInfo.h
@@ -20,7 +20,7 @@
 #include "clang/AST/PrettyPrinter.h"
 #include "clang/AST/Type.h"
 #include "clang/AST/TypeOrdering.h"
-#include "clang/Basic/ASTSourceDescriptor.h"
+#include "clang/Basic/Module/ASTSourceDescriptor.h"
 #include "clang/Basic/CodeGenOptions.h"
 #include "clang/Basic/SourceLocation.h"
 #include "llvm/ADT/DenseMap.h"
diff --git a/clang/lib/CodeGen/CodeGenModule.cpp b/clang/lib/CodeGen/CodeGenModule.cpp
index e4774a587707a..993699a3b2a93 100644
--- a/clang/lib/CodeGen/CodeGenModule.cpp
+++ b/clang/lib/CodeGen/CodeGenModule.cpp
@@ -42,7 +42,7 @@
 #include "clang/Basic/CodeGenOptions.h"
 #include "clang/Basic/Diagnostic.h"
 #include "clang/Basic/FileManager.h"
-#include "clang/Basic/Module.h"
+#include "clang/Basic/Module/Module.h"
 #include "clang/Basic/SourceManager.h"
 #include "clang/Basic/TargetInfo.h"
 #include "clang/Basic/Version.h"
diff --git a/clang/lib/CodeGen/CodeGenModule.h b/clang/lib/CodeGen/CodeGenModule.h
index 0f68418130ead..61d281670d420 100644
--- a/clang/lib/CodeGen/CodeGenModule.h
+++ b/clang/lib/CodeGen/CodeGenModule.h
@@ -24,7 +24,7 @@
 #include "clang/AST/Mangle.h"
 #include "clang/Basic/ABI.h"
 #include "clang/Basic/LangOptions.h"
-#include "clang/Basic/Module.h"
+#include "clang/Basic/Module/Module.h"
 #include "clang/Basic/NoSanitizeList.h"
 #include "clang/Basic/ProfileList.h"
 #include "clang/Basic/TargetInfo.h"
diff --git a/clang/lib/ExtractAPI/API.cpp b/clang/lib/ExtractAPI/API.cpp
index 96bef967d8591..233377d6f7317 100644
--- a/clang/lib/ExtractAPI/API.cpp
+++ b/clang/lib/ExtractAPI/API.cpp
@@ -14,7 +14,7 @@
 
 #include "clang/ExtractAPI/API.h"
 #include "clang/AST/RawCommentList.h"
-#include "clang/Basic/Module.h"
+#include "clang/Basic/Module/Module.h"
 #include "clang/Index/USRGeneration.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/Support/ErrorHandling.h"
diff --git a/clang/lib/ExtractAPI/TypedefUnderlyingTypeResolver.cpp b/clang/lib/ExtractAPI/TypedefUnderlyingTypeResolver.cpp
index 41e4e0cf1795f..cf105726ae6ff 100644
--- a/clang/lib/ExtractAPI/TypedefUnderlyingTypeResolver.cpp
+++ b/clang/lib/ExtractAPI/TypedefUnderlyingTypeResolver.cpp
@@ -12,7 +12,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "clang/ExtractAPI/TypedefUnderlyingTypeResolver.h"
-#include "clang/Basic/Module.h"
+#include "clang/Basic/Module/Module.h"
 #include "clang/Index/USRGeneration.h"
 
 using namespace clang;
diff --git a/clang/lib/Frontend/ASTUnit.cpp b/clang/lib/Frontend/ASTUnit.cpp
index 8d24d5d422520..959ef895a0893 100644
--- a/clang/lib/Frontend/ASTUnit.cpp
+++ b/clang/lib/Frontend/ASTUnit.cpp
@@ -31,7 +31,7 @@
 #include "clang/Basic/LLVM.h"
 #include "clang/Basic/LangOptions.h"
 #include "clang/Basic/LangStandard.h"
-#include "clang/Basic/Module.h"
+#include "clang/Basic/Module/Module.h"
 #include "clang/Basic/SourceLocation.h"
 #include "clang/Basic/SourceManager.h"
 #include "clang/Basic/TargetInfo.h"
diff --git a/clang/lib/Frontend/FrontendActions.cpp b/clang/lib/Frontend/FrontendActions.cpp
index 454653a31534c..e41dd4c796523 100644
--- a/clang/lib/Frontend/FrontendActions.cpp
+++ b/clang/lib/Frontend/FrontendActions.cpp
@@ -11,7 +11,7 @@
 #include "clang/AST/Decl.h"
 #include "clang/Basic/FileManager.h"
 #include "clang/Basic/LangStandard.h"
-#include "clang/Basic/Module.h"
+#include "clang/Basic/Module/Module.h"
 #include "clang/Basic/TargetInfo.h"
 #include "clang/Frontend/ASTConsumers.h"
 #include "clang/Frontend/CompilerInstance.h"
diff --git a/clang/lib/Lex/HeaderSearch.cpp b/clang/lib/Lex/HeaderSearch.cpp
index 574723b33866a..de930f8dabb46 100644
--- a/clang/lib/Lex/HeaderSearch.cpp
+++ b/clang/lib/Lex/HeaderSearch.cpp
@@ -14,7 +14,7 @@
 #include "clang/Basic/Diagnostic.h"
 #include "clang/Basic/FileManager.h"
 #include "clang/Basic/IdentifierTable.h"
-#include "clang/Basic/Module.h"
+#include "clang/Basic/Module/Module.h"
 #include "clang/Basic/SourceManager.h"
 #include "clang/Lex/DirectoryLookup.h"
 #include "clang/Lex/ExternalPreprocessorSource.h"
diff --git a/clang/lib/Lex/ModuleMap.cpp b/clang/lib/Lex/ModuleMap.cpp
index eed7eca2e7356..37c259d9da5ae 100644
--- a/clang/lib/Lex/ModuleMap.cpp
+++ b/clang/lib/Lex/ModuleMap.cpp
@@ -17,7 +17,7 @@
 #include "clang/Basic/FileManager.h"
 #include "clang/Basic/LLVM.h"
 #include "clang/Basic/LangOptions.h"
-#include "clang/Basic/Module.h"
+#include "clang/Basic/Module/Module.h"
 #include "clang/Basic/SourceLocation.h"
 #include "clang/Basic/SourceManager.h"
 #include "clang/Basic/TargetInfo.h"
diff --git a/clang/lib/Lex/PPDirectives.cpp b/clang/lib/Lex/PPDirectives.cpp
index 8e7386449dced..95a14bee51874 100644
--- a/clang/lib/Lex/PPDirectives.cpp
+++ b/clang/lib/Lex/PPDirectives.cpp
@@ -16,7 +16,7 @@
 #include "clang/Basic/FileManager.h"
 #include "clang/Basic/IdentifierTable.h"
 #include "clang/Basic/LangOptions.h"
-#include "clang/Basic/Module.h"
+#include "clang/Basic/Module/Module.h"
 #include "clang/Basic/SourceLocation.h"
 #include "clang/Basic/SourceManager.h"
 #include "clang/Basic/TokenKinds.h"
diff --git a/clang/lib/Lex/Pragma.cpp b/clang/lib/Lex/Pragma.cpp
index 10f0ab7180e62..6a0dffdc8788e 100644
--- a/clang/lib/Lex/Pragma.cpp
+++ b/clang/lib/Lex/Pragma.cpp
@@ -18,7 +18,7 @@
 #include "clang/Basic/IdentifierTable.h"
 #include "clang/Basic/LLVM.h"
 #include "clang/Basic/LangOptions.h"
-#include "clang/Basic/Module.h"
+#include "clang/Basic/Module/Module.h"
 #include "clang/Basic/SourceLocation.h"
 #include "clang/Basic/SourceManager.h"
 #include "clang/Basic/TokenKinds.h"
diff --git a/clang/lib/Lex/Preprocessor.cpp b/clang/lib/Lex/Preprocessor.cpp
index 0b70192743a39..be9646cbb8d8e 100644
--- a/clang/lib/Lex/Preprocessor.cpp
+++ b/clang/lib/Lex/Preprocessor.cpp
@@ -31,7 +31,7 @@
 #include "clang/Basic/IdentifierTable.h"
 #include "clang/Basic/LLVM.h"
 #include "clang/Basic/LangOptions.h"
-#include "clang/Basic/Module.h"
+#include "clang/Basic/Module/Module.h"
 #include "clang/Basic/SourceLocation.h"
 #include "clang/Basic/SourceManager.h"
 #include "clang/Basic/TargetInfo.h"
diff --git a/clang/lib/Serialization/ASTReader.cpp b/clang/lib/Serialization/ASTReader.cpp
index 389ac4ed76240..d596082d2102f 100644
--- a/clang/lib/Serialization/ASTReader.cpp
+++ b/clang/lib/Serialization/ASTReader.cpp
@@ -40,7 +40,7 @@
 #include "clang/AST/TypeLoc.h"
 #include "clang/AST/TypeLocVisitor.h"
 #include "clang/AST/UnresolvedSet.h"
-#include "clang/Basic/ASTSourceDescriptor.h"
+#include "clang/Basic/Module/ASTSourceDescriptor.h"
 #include "clang/Basic/CommentOptions.h"
 #include "clang/Basic/Diagnostic.h"
 #include "clang/Basic/DiagnosticError.h"
@@ -52,7 +52,7 @@
 #include "clang/Basic/IdentifierTable.h"
 #include "clang/Basic/LLVM.h"
 #include "clang/Basic/LangOptions.h"
-#include "clang/Basic/Module.h"
+#include "clang/Basic/Module/Module.h"
 #include "clang/Basic/ObjCRuntime.h"
 #include "clang/Basic/OpenACCKinds.h"
 #include "clang/Basic/OpenMPKinds.h"
diff --git a/clang/lib/Serialization/ASTReaderDecl.cpp b/clang/lib/Serialization/ASTReaderDecl.cpp
index 61cc99d4df687..8cb291d00eee0 100644
--- a/clang/lib/Serialization/ASTReaderDecl.cpp
+++ b/clang/lib/Serialization/ASTReaderDecl.cpp
@@ -45,7 +45,7 @@
 #include "clang/Basic/Lambda.h"
 #include "clang/Basic/LangOptions.h"
 #include "clang/Basic/Linkage.h"
-#include "clang/Basic/Module.h"
+#include "clang/Basic/Module/Module.h"
 #include "clang/Basic/PragmaKinds.h"
 #include "clang/Basic/SourceLocation.h"
 #include "clang/Basic/Specifiers.h"
diff --git a/clang/lib/Serialization/ASTWriter.cpp b/clang/lib/Serialization/ASTWriter.cpp
index 00b0e48083217..6a3173b74c0c3 100644
--- a/clang/lib/Serialization/ASTWriter.cpp
+++ b/clang/lib/Serialization/ASTWriter.cpp
@@ -43,7 +43,7 @@
 #include "clang/Basic/LLVM.h"
 #include "clang/Basic/Lambda.h"
 #include "clang/Basic/LangOptions.h"
-#include "clang/Basic/Module.h"
+#include "clang/Basic/Module/Module.h"
 #include "clang/Basic/ObjCRuntime.h"
 #include "clang/Basic/OpenACCKinds.h"
 #include "clang/Basic/OpenCLOptions.h"
diff --git a/libcxx/test/tools/clang_tidy_checks/header_exportable_declarations.cpp b/libcxx/test/tools/clang_tidy_checks/header_exportable_declarations.cpp
index 0a48f855fba06..054cdf27d8ccc 100644
--- a/libcxx/test/tools/clang_tidy_checks/header_exportable_declarations.cpp
+++ b/libcxx/test/tools/clang_tidy_checks/header_exportable_declarations.cpp
@@ -9,7 +9,7 @@
 #include "clang-tidy/ClangTidyCheck.h"
 #include "clang-tidy/ClangTidyModuleRegistry.h"
 
-#include "clang/Basic/Module.h"
+#include "clang/Basic/Module/Module.h"
 
 #include "llvm/ADT/ArrayRef.h"
 
diff --git a/lldb/source/Plugins/ExpressionParser/Clang/ASTUtils.h b/lldb/source/Plugins/ExpressionParser/Clang/ASTUtils.h
index da2b1a15f7461..74cde0c89cb08 100644
--- a/lldb/source/Plugins/ExpressionParser/Clang/ASTUtils.h
+++ b/lldb/source/Plugins/ExpressionParser/Clang/ASTUtils.h
@@ -9,7 +9,7 @@
 #ifndef LLDB_SOURCE_PLUGINS_EXPRESSIONPARSER_CLANG_ASTUTILS_H
 #define LLDB_SOURCE_PLUGINS_EXPRESSIONPARSER_CLANG_ASTUTILS_H
 
-#include "clang/Basic/ASTSourceDescriptor.h"
+#include "clang/Basic/Module/ASTSourceDescriptor.h"
 #include "clang/Sema/Lookup.h"
 #include "clang/Sema/MultiplexExternalSemaSource.h"
 #include "clang/Sema/Sema.h"
diff --git a/lldb/source/Plugins/ExpressionParser/Clang/ClangExternalASTSourceCallbacks.cpp b/lldb/source/Plugins/ExpressionParser/Clang/ClangExternalASTSourceCallbacks.cpp
index e746e6afe39be..c72d493a7288d 100644
--- a/lldb/source/Plugins/ExpressionParser/Clang/ClangExternalASTSourceCallbacks.cpp
+++ b/lldb/source/Plugins/ExpressionParser/Clang/ClangExternalASTSourceCallbacks.cpp
@@ -11,7 +11,7 @@
 
 #include "clang/AST/Decl.h"
 #include "clang/AST/DeclObjC.h"
-#include "clang/Basic/Module.h"
+#include "clang/Basic/Module/Module.h"
 #include <optional>
 
 using namespace lldb_private;
diff --git a/lldb/source/Plugins/ExpressionParser/Clang/ClangExternalASTSourceCallbacks.h b/lldb/source/Plugins/ExpressionParser/Clang/ClangExternalASTSourceCallbacks.h
index 6bd18186a567d..c874e5be23547 100644
--- a/lldb/source/Plugins/ExpressionParser/Clang/ClangExternalASTSourceCallbacks.h
+++ b/lldb/source/Plugins/ExpressionParser/Clang/ClangExternalASTSourceCallbacks.h
@@ -10,7 +10,7 @@
 #define LLDB_SOURCE_PLUGINS_EXPRESSIONPARSER_CLANG_CLANGEXTERNALASTSOURCECALLBACKS_H
 
 #include "Plugins/TypeSystem/Clang/TypeSystemClang.h"
-#include "clang/Basic/ASTSourceDescriptor.h"
+#include "clang/Basic/Module/ASTSourceDescriptor.h"
 #include <optional>
 
 namespace clang {



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